Thermal runaway alarm method and device

Abstract

This application provides a thermal runaway alarm device and method, belonging to the field of battery thermal runaway technology. The method includes: after a thermal battery module is activated when its temperature reaches a first threshold, it supplies power to a first power management module. The first power management module is connected to a control module, and then supplies power to the control module according to the power supply status of the thermal battery module. This enables the control module to issue a thermal runaway alarm when the temperature reaches a second threshold, improving the safety and reliability of lithium battery management.

Description

Technical Field

[0001] This application relates to the field of battery thermal runaway technology, and in particular to a thermal runaway alarm method and device. Background Technology

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

[0003] In related technologies, thermal runaway alarms are used to detect battery thermal runaway. These alarm devices require an external power supply or are powered by the monitored battery pack itself.

[0004] Because external power supplies or battery packs will self-discharge during use, the lifespan 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 source fails or the battery pack itself is damaged due to thermal runaway, the thermal runaway alarm device loses its ability to function and cannot generate an effective warning, thereby reducing the safety and reliability of power battery management. Summary of the Invention

[0006] This 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] On the one hand, 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 first power management module after being activated when the temperature reaches the first threshold.

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

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

[0011] The module housing has a receiving cavity, which includes a first sidewall and a second sidewall. The first sidewall is provided with a first through hole communicating with the receiving cavity, and the second sidewall is provided with a second electrode tab.

[0012] The battery cell has a multi-layer electrode stacked structure and is located within the receiving cavity;

[0013] A second through hole is provided on the second side wall, and the first electrode tab passes through the second through hole to connect with the battery cell.

[0014] In one possible implementation, the receiving cavity further includes a third sidewall, which is disposed opposite to the first sidewall, and the third sidewall is provided with a third through hole corresponding to the first through hole, and the first through hole communicates with the third through hole.

[0015] In one possible implementation, the battery cell includes: multiple thermal battery cells connected in series, each thermal battery cell having a three-layer electrode stack structure.

[0016] In one possible implementation, each of the thermal battery cells includes a positive electrode plate, a negative electrode plate, and an electrolyte, wherein the negative electrode plate is connected to the first sidewall, and the negative electrode plate, the electrolyte, and the positive electrode plate are stacked sequentially.

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

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

[0019] The voltage regulator input module is connected to the thermal battery module, and the voltage regulator input module is used to boost the voltage input from the thermal battery module;

[0020] The energy storage module is connected to the voltage regulator output module; the voltage regulator output module is used to regulate the voltage output by the energy storage module and step it down to the target voltage.

[0021] The power-on switch module is connected to the voltage regulator 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 regulator module reaches the target voltage;

[0022] The voltage regulator output module is connected to the monitoring module, the voltage regulator 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 one 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. When the temperature acquired by the temperature acquisition module reaches a second threshold, the main control module controls the positioning module to locate and obtain location information, and sends an alarm message carrying the location information.

[0024] In one possible implementation, the device further includes: a heat-insulating shell and a heat-insulating element, the heat-insulating element being attached to the inner wall of the heat-insulating shell and the heat-insulating element being arranged to form a cavity, wherein the first power management module and the control module are disposed within the cavity.

[0025] On the other hand, a thermal runaway alarm method is provided, the method employing a thermal runaway alarm device, the device comprising: a thermal battery module, a first power 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 first power management module; the first power management module is used to control the control module to power on according to the power supply status of the thermal battery module; the control module is used to trigger a thermal runaway alarm when the acquired temperature reaches a second threshold.

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

[0028] In this embodiment, the thermal battery module is activated after the temperature reaches a first threshold and supplies power to the first power management module. 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 supplies power to the control module according to the power supply status of the thermal battery module. This enables the control module to issue a thermal runaway alarm when the temperature reaches a second threshold, thereby improving the safety and reliability of power battery management.

[0029] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

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

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

[0032] Figure 2This is a schematic diagram of the structure of a module housing provided in an embodiment of this application;

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

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

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

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

[0037] Figure 7 A flowchart of a thermal runaway alarm method provided in an embodiment of this application.

[0038] Figure label:

[0039] 100, First through hole; 110, First tab; 120, Second tab; 130, Module housing; 131, First sidewall; 132, Second sidewall; 133, Third sidewall; 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 insulating layer; 240, Wire; 250, Thermal battery unit;

[0041] 300. Thermal insulation shell; 310. Thermal insulation component;

[0042] 400. Control module; 410. Thermal battery module; 420. First power management module; 421. Voltage regulated input module; 422. Energy storage module; 423. Power-on switch module; 424. Voltage regulated 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 radio frequency drive module; 444. Level conversion module; 450. Positioning module; 451. Third power management module; 452. Second logic control module; 453. Second radio frequency drive module.

[0043] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] The application scenarios of thermal runaway alarm devices will be explained below.

[0046] The thermal runaway alarm device of this application can be used to monitor the thermal runaway of lithium batteries. The power battery can be any stage of its entire life cycle, including production, transportation, assembly, use, disposal, dismantling, and recycling. When using the thermal runaway alarm device to monitor the power battery, it can be placed around the power battery so that the device can be effectively heated when thermal runaway occurs.

[0047] In this embodiment, the thermal battery module is activated when the temperature reaches a first threshold and outputs voltage to the first power management module. The thermal battery module does not self-discharge. The first power management module is connected to the control module, and then the first power management module supplies power to the control module according to the power supply status of the thermal battery module. This enables the control module to issue 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, this application embodiment 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: module housing 130, battery cell 140, first electrode 110, and second electrode 120;

[0049] Figure 2 This is a schematic diagram of the structure of a module housing provided in an embodiment of this application, as shown below. Figure 2 As shown, the module housing 130 has a receiving cavity, which includes a first sidewall 131 and a second sidewall 132. The first sidewall 131 is provided with a first through hole 100 communicating with the receiving cavity, and the second sidewall 132 is provided with a second electrode tab 120. The battery cell 140 has a multi-layer electrode stacked structure and is located in the receiving cavity. The second sidewall 132 is provided with a second through hole 160, and the first electrode tab 110 passes through the second through hole 160 and connects to the battery cell 140.

[0050] In some embodiments, the module housing 130 can be a good conductor of heat and electricity, allowing heat to be quickly conducted to the battery cell 140 in high-temperature environments. Heat can also be conducted to the battery cell 140 through the first through-hole 100, thereby rapidly activating the thermal battery module 410. For example, the module housing 130 can be made of 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 cuboid, and it can be integrally formed.

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

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

[0053] In some embodiments, the receiving cavity further includes a third sidewall 133, which is disposed opposite to the first sidewall 131. The third sidewall is provided with a third through hole 150 corresponding to the first through hole 100, and the first through hole 100 and the third through hole 150 are connected.

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

[0055] The shapes of the first through hole 100 and the third through hole 150 can be set according to the actual situation. For example, the shapes of the first through hole 100 and the third through hole can be circles, squares, or rectangles.

[0056] In some embodiments, to ensure the fast-activation thermal battery module 410, the battery cell 140 may not be provided in the receiving cavity through which the first through hole 100 and the third through hole 150 communicate. To prevent short circuits, a mica insulating layer 230 is provided between the receiving cavity through which the first through hole 100 and the third through hole 150 communicate and the battery cell 140.

[0057] like Figure 4As shown in the figure, this application provides a cross-sectional view of a thermal battery module. The battery cell 140 includes multiple thermal battery units 250 connected in series, each thermal battery unit 250 having a three-layer electrode stack structure. In some embodiments, each thermal battery unit 250 includes a positive electrode plate 200, a negative electrode plate 210, and an electrolyte 220. The negative electrode plate 210 is connected to a first sidewall 131, and the negative electrode plate 210, electrolyte 220, and positive electrode plate 200 are stacked sequentially.

[0058] The negative electrode 210 is lithium silicide, the positive electrode 200 is a mixture of ferrous sulfide and cobalt sulfide, and the electrolyte 220 is a mixture of lithium chloride and potassium chloride. The ferrous sulfide-cobalt sulfide mixture exhibits superior redox properties, good electronic conductivity, and a thermal decomposition temperature of not less than 570℃. Lithium silicide possesses high energy density, good electronic conductivity, and a thermal decomposition temperature of not less than 730℃. The lithium chloride-potassium chloride mixture achieves high conductivity, a melting temperature of 352℃, and a melting enthalpy of 235.6 J / g, thus ensuring that the thermal battery module 410 is rapidly activated and discharged externally in the event of thermal runaway of the lithium battery.

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

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

[0061] The thermal battery module 410 has no active heating device inside. When the lithium battery pack experiences thermal runaway, the external high temperature is conducted to the inside of the cell 140 through the through hole on the module housing 130 of the thermal battery module 410. The electrolyte 220 in the cell 140 absorbs heat and melts, forming an ion channel, which activates the thermal battery module 410 and starts to discharge externally.

[0062] like Figure 6 As shown in the diagram, this application provides a structural block diagram of a thermal runaway alarm device, which 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. The thermal battery module 410 is activated after the temperature reaches the first threshold and supplies power to the first power management module.

[0064] The first power management module 420 is connected to the control module 400. 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 trigger a thermal runaway alarm when the acquired temperature reaches the second threshold.

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

[0066] Figure 5 This application provides a schematic diagram of the structure of a thermal runaway alarm device, as shown in the embodiment. Figure 5 As shown, the thermal runaway alarm device also includes: a heat insulation shell 300 and a heat insulation component 310. The heat insulation component 310 is attached to the inner wall of the heat insulation shell 300, and the heat insulation component 310 forms a cavity. The first power management module 420 and the control module 400 are disposed in the cavity.

[0067] In some embodiments, the heat insulation element 310 is a silica aerogel heat insulation material. The heat insulation shell 300 is a high-temperature resistant non-metallic material, such as ceramic.

[0068] like Figure 5 As shown in the figure, this application embodiment provides a structural block diagram of a thermal runaway alarm device. The thermal battery module 410 is fixed to the heat insulation shell 300 by riveting. The first tab 110 and the second tab 120 of the thermal battery module 410 extend into the heat insulation shell 300 respectively. The first power management module 420 and the control module 400 are powered by wires 240 passing through the heat insulation component 310, so as to reduce the heat transfer 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 tab 110 and the second tab 120 to extend into the heat insulation housing 300 respectively, the heat insulation housing 300 is provided with two through holes. The position and size of the two through holes are set according to the first tab 110 and the second tab 120. The first tab 110 and the second tab 120 extend into the heat insulation housing 300 through their respective through holes. No heat insulation element 310 is provided at the positions where the first tab 110 and the second tab 120 extend into the heat insulation housing 300 respectively.

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

[0071] The voltage regulated input module 421 is connected to the thermal battery module 410 and the energy storage module 422 respectively. The voltage regulated input module 421 is used to boost the voltage input from the thermal battery module 410 and input it to the energy storage module 422. The energy storage module 422 is connected to the voltage regulated output module 424. The voltage regulated output module 424 is used to regulate the voltage output from the energy storage module 422 and step it down to the target voltage. The power-on switch module 423 is connected to the voltage regulated 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 and the output voltage of the voltage regulated output module 424 reaches the target voltage. The voltage regulated output module 424 is connected to the monitoring module 425. The voltage regulated output module 424 supplies power to the monitoring module 425. The monitoring module 425 is used to reset the control module 400 when the control module 400 is abnormal.

[0072] The voltage regulator input module 421 boosts the voltage to obtain a first voltage, which is then input to the energy storage module 422 to charge the energy storage module 422. The magnitude of the first voltage is related to the circuit within the voltage regulator input module 421 and is calculated accordingly based on the specific circuit.

[0073] The voltage regulator output module 424 is a step-down switching power supply management chip that can regulate the changing voltage output by the energy storage module 422 to the target voltage. The magnitude of the target voltage can be set according to the actual situation, for example, the target voltage can be 5V.

[0074] The first power management module 420 can perform secondary energy storage for the thermal battery module 410. When the thermal battery module 410 is depleted of power 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 pulse signals to the monitoring module 425 to indicate the working status. When the program running by the control module 400 malfunctions, 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, it will supply power to the first power management module 420, which in turn will supply power to the control module 400. In the early stage of activation, the power supply of the thermal battery module 410 is unstable. Since the first power management module 420 can monitor the power supply status of the thermal battery module 410, it will not power on the control module 400. In this state, the first power management module 420 supplies power to the control module 400, connecting it to the power supply. However, the control module 400 is still in an inactive state. The power-on switch module 423 needs to trigger the control module 400 to power on (enable) after the voltage of the energy storage module 422 is greater than the first threshold and the output voltage of the voltage regulator module 424 reaches the target voltage. This will enable the control module 400 to power on and start running.

[0077] In some embodiments, the power-on switch module 423 can control the control module 400 to operate for a preset time after the voltage of the energy storage module 422 exceeds a first threshold and the output voltage of the voltage regulation output module 424 reaches the target voltage. This allows the control module 400 to power on with a delay, and the preset power-on delay time can be preset 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. Powering on the control module 400 can power on the main control module 440, and the positioning module 450 and the temperature acquisition module 430 can be put into operation after being powered by the first power management module 420.

[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 locate and obtain location information when the temperature acquired by the temperature acquisition module 430 reaches the second threshold, and to send alarm information carrying the location information.

[0080] The temperature acquisition module 430 can be installed on the outer wall of the heat insulation housing 300. The temperature acquisition module 430 can be a temperature sensor, which collects the temperature around the thermal runaway alarm device.

[0081] The positioning module 450 can be a GPS positioning module 450. The positioning module 450 determines the location information corresponding to the current location, and then sends the location information to the corresponding terminal of the fire extinguishing center to complete the automatic alarm, so that the staff of the fire extinguishing center can put out the fire.

[0082] In some embodiments, the main control module 440 can record the parameters of the monitored lithium battery pack, which may include: battery pack type, manufacturer, production date, capacity, and voltage platform. When sending alarm information, the corresponding lithium battery pack parameters can also be included, so that the appropriate fire extinguishing plan can be determined based on the battery pack parameters and the quality of the battery can be assessed.

[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 radio frequency drive module 443, and a level conversion module 444. The second power management module 441 is used to convert the voltage output by the voltage regulator module 424 into a voltage that the main control module 440 can use. The first logic control module 442 is used to control the positioning module 450 to perform positioning to obtain position information. The first radio frequency drive module 443 is used to send lithium battery pack parameters. The level conversion module 444 is used to convert the control signal sent by the main control module 440 into a signal that the positioning module 450 can recognize.

[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 radio frequency drive module 453. The third power management module 451 is used to convert the voltage output by the voltage regulator module 424 into a voltage that the positioning module 450 can use. The second logic control module 452 is used to determine the location information, and the second radio frequency drive module 453 is used to transmit 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 acquisition module 430 does not reach the second threshold.

[0086] It should be noted that unexpected damage to the thermal battery module 410 in the thermal runaway alarm device during use may cause it to activate. In this case, the activation is not due to thermal runaway of the monitored lithium battery. Therefore, the temperature acquired by the temperature acquisition module 430 will not reach the second threshold, and a thermal runaway alarm device failure signal will be sent to indicate that the thermal runaway alarm device has failed. Both alarm and failure signals will cease once the thermal runaway alarm device's power is depleted.

[0087] In this embodiment, the thermal battery module is activated when the temperature reaches a first threshold and outputs voltage to the first power management module. The thermal battery module does not self-discharge. The first power management module is connected to the control module, and then the first power management module supplies power to the control module according to the power supply status of the thermal battery module. This enables the control module to issue 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, this application provides a flowchart of a thermal runaway alarm method. The device includes: a thermal battery module 410, a first power management module 420, and a control module 400. The method is... Figure 3 The thermal runaway alarm device in the illustrated embodiment is executed by means of:

[0089] Step 601: If the thermal battery module 410 is activated when the temperature reaches the first threshold, the thermal battery module 410 is used to supply power to the first power 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.

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

[0091] In this embodiment, the thermal battery module 410 is activated after the temperature reaches a first threshold and outputs voltage to the first power management module. The thermal battery module 410 does not self-discharge. The first power management module 420 is connected to the control module 400, and then the first power management module 420 supplies power to the control module 400 according to the power supply status of the thermal battery module 410. This enables the control module 400 to perform a thermal runaway alarm when the temperature reaches a second threshold, thereby improving the safety and reliability of lithium battery management.

[0092] In one possible implementation, the first power management module 420 includes: a voltage regulator input module 421, an energy storage module 422, a power-on switch module 423, a voltage regulator output module 424, and a monitoring module 425; the voltage regulator input module 421 boosts the received voltage and inputs it to the energy storage module 422; the voltage regulator output module 424 regulates the voltage output by the energy storage module 422 and steps it down 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 regulation output module 424 reaches the target voltage.

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

[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 acquired by the temperature acquisition module 430 reaches a second threshold, the main control module 440 controls the positioning module 450 to perform positioning to obtain location information and sends an alarm message carrying the location information.

[0096] In the various embodiments of this application, the functional modules can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules can be implemented in hardware or as software functional modules.

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

Claims

1. A thermal runaway alarm device, characterized in that, The device includes: 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 first power management module (420) after being activated when the temperature reaches the first threshold. The first power management module (420) is connected to the control module (400). 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 perform a thermal runaway alarm when the acquired temperature reaches the second threshold.

2. The apparatus according to claim 1, characterized in that, The thermal battery module (410) includes: a module housing (130), a battery cell (140), a first electrode (110), and a second electrode (120); wherein, The module housing (130) has a receiving cavity, which includes a first sidewall (131) and a second sidewall (132). The first sidewall (131) is provided with a first through hole (100) communicating with the receiving cavity, and the second sidewall (132) is provided with a second tab (120). The battery cell (140) has a multi-layer electrode stacked structure and is located within the receiving cavity; A second through hole (160) is provided on the second sidewall (132), and the first electrode (110) passes through the second through hole (160) and is connected to the battery cell (140).

3. The apparatus according to claim 2, characterized in that, The receiving cavity also includes a third sidewall (133), which is disposed opposite to the first sidewall (131). The third sidewall (133) is provided with a third through hole (150) corresponding to the first through hole (100), and the first through hole (100) communicates with the third through hole (150).

4. The apparatus according to claim 2, characterized in that, The battery cell (140) includes: multiple thermal battery units (250) connected in series, each thermal battery unit (250) having a three-layer electrode stack structure.

5. The apparatus according to claim 4, characterized in that, Each of the thermal battery cells (250) includes a positive electrode plate (200), a negative electrode plate (210), and an electrolyte (220). The negative electrode plate (210) is connected to the first sidewall, and the negative electrode plate (210), the electrolyte (220), and the positive electrode plate (200) are stacked in sequence.

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

7. The apparatus according to claim 1, characterized in that, The first power management module (420) includes: a voltage regulator input module (421), an energy storage module (422), a power-on switch module (423), a voltage regulator output module (424), and a monitoring module (425). The voltage regulator input module (421) is connected to the thermal battery module (410) and the energy storage module (422) respectively. The voltage regulator input module (421) is used to boost the voltage input from the thermal battery module (410) and input it to the energy storage module (422). The energy storage module (422) is connected to the voltage regulator output module (424); the voltage regulator output module (424) is used to regulate the voltage output by the energy storage module (422) and reduce it to the target voltage; The power-on switch module (423) is connected to the voltage regulator 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 and the output voltage of the voltage regulator output module (424) reaches the target voltage; The voltage regulator output module (424) is connected to the monitoring module (425). The voltage regulator output module (424) supplies power to the monitoring module (425). The monitoring module (425) is used to reset the control module (400) when the control module (400) is abnormal.

8. The apparatus according to claim 1, characterized in that, The control module (400) includes 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 locate and obtain location information when the temperature acquired by the temperature acquisition module (430) reaches a second threshold, and to send an alarm message carrying the location information.

9. The apparatus according to claim 1, characterized in that, The device further includes: a heat insulation shell (300) and a heat insulation component (310), the heat insulation component (310) being attached to the inner wall of the heat insulation shell (300), the heat insulation component (310) being arranged to form a cavity, and the first power management module (420) and the control module (400) being disposed in the cavity.

10. A thermal runaway alarm method, the method employing a thermal runaway alarm device, the device comprising: The method comprises a thermal battery module (410), a first power management module (420), and a control module (400), wherein: If the thermal battery module (410) is activated when the temperature reaches the first threshold, the thermal battery module (410) is used to supply power to the first power 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); the control module (400) will issue a thermal runaway alarm when the acquired temperature reaches the second threshold.

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