Thermal runaway triggering device

Abstract

This application provides a thermal runaway triggering device for triggering thermal runaway in a battery containing ferromagnetic material. The thermal runaway triggering device includes a fixing component, a heating component, and a controller. The fixing component is used to fix the battery. The controller can output alternating current. The heating component has a conductive coil connected to the controller. The conductive coil is arranged around the battery and generates an alternating magnetic field around the ferromagnetic material under the action of alternating current. This causes eddy currents to be induced in the ferromagnetic material inside the battery under the action of the alternating magnetic field. The eddy currents can cause the charge carriers in the ferromagnetic material to move at high speed and randomly and to collide and rub against each other with atoms to generate heat energy, thereby achieving a self-heating effect inside the battery, thus triggering thermal runaway in the battery. Since it can heat the battery without relying on heat transfer, the thermal conversion efficiency is high, and it can simulate the thermal runaway scenario of the battery more realistically, thus improving the accuracy of the test results.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a thermal runaway triggering device. Background Technology

[0002] Currently, with the widespread use of lithium-ion batteries in various industries, safety accidents caused by lithium batteries are becoming more and more frequent. As a result, the safety of lithium batteries is receiving more and more attention. In order to understand the performance of lithium batteries under extreme conditions in advance, it is necessary to conduct thermal runaway tests on lithium batteries.

[0003] Methods for triggering battery thermal runaway include heating triggering, overcharge triggering, and needle penetration triggering. Heating triggering involves creating a heat source around the lithium battery, which then contacts the battery surface and transfers heat to the battery, simulating thermal runaway. However, introducing external heat cannot simulate a real battery thermal runaway scenario, and it relies on a good contact surface to ensure that heat transfer efficiency is not affected, thus impacting the accuracy of the test results. Utility Model Content

[0004] The purpose of this application is to provide a thermal runaway triggering device that can improve the accuracy of test results.

[0005] A thermal runaway triggering device is disclosed for triggering thermal runaway of a battery containing a ferromagnetic material. The thermal runaway triggering device includes a fixing component, a heating component, and a controller. The fixing component is used to fix the battery. The controller is capable of outputting alternating current. The heating component has a conductive coil connected to the controller. The conductive coil is arranged around the battery and generates an alternating magnetic field around the ferromagnetic material under the action of the alternating current.

[0006] In one embodiment, the heating assembly includes multiple heating units that are detachably connected end-to-end and together form a ring structure surrounding the battery; each heating unit has a coil layer, and the coil layers of the multiple heating units are electrically connected and together constitute the conductive coil.

[0007] In one embodiment, the heating unit includes a protective layer and a heat insulation layer, wherein the protective layer, the coil layer and the heat insulation layer are arranged sequentially from the inside to the outside along the annular structure.

[0008] In one embodiment, the heating assembly includes a first plug and a second plug. For two connected heating units, the first plug is electrically connected to the coil layer of one of the heating units, and the second plug is electrically connected to the coil layer of the other heating unit. The first plug and the second plug are pluggable.

[0009] In one embodiment, the first plug includes a main fluid, a first contact body, and a first sub-fluid. The main fluid is electrically connected between the controller and the first contact body. One end of the first sub-fluid is electrically connected to the main fluid, and the other end is electrically connected to the coil layer of one of the heating units. The second plug includes a second contact body and a second sub-fluid. One end of the second sub-fluid is electrically connected to the second contact body, and the other end is electrically connected to the coil layer of another heating unit. The first contact body and the second contact body are pluggable to achieve electrical connection.

[0010] In one embodiment, there are multiple first plugs and multiple second plugs; the coil layer has multiple wires, and the number of wires in the coil layers of the multiple heating units is equal; the end of any wire is electrically connected to the first sub-conductor or the second sub-conductor; each of the first plugs and / or each of the second plugs connected to the ends of the multiple wires in the coil layer on the same side is fixed on the same mounting base.

[0011] In one embodiment, the controller has multiple output poles, and the frequency of the alternating current output by each output pole is adjustable; the conductive coil has multiple current transmission paths, and the multiple current transmission paths are connected one-to-one to the multiple output poles.

[0012] In one embodiment, the fixing component includes a back plate, a fixing block, and a movable block. The fixing block is connected to the back plate and fixed relative to the back plate. The movable block is movably connected to the back plate and, together with the fixing block, clamps or releases the battery.

[0013] In one embodiment, the fixing component includes a base, a connecting rod, and an adjusting member. The base includes a chassis and a tubular portion connected to the chassis. The chassis is fixedly installed on the back plate. The fixing block is fixedly installed on the inner wall of the tubular portion. The connecting rod passes through the tubular portion radially and is connected at one end to the movable block. The adjusting member is threadedly connected to the connecting rod on the periphery of the tubular portion.

[0014] In one embodiment, the thermal runaway triggering device includes a base that forms a receiving groove extending along a first direction, in which at least a portion of the heating component can be received, the heating component being slidably connected to the base along the first direction; and a fixing component being fixedly connected to the base and located on one side of the base along the first direction.

[0015] In the thermal runaway triggering device of this application, the alternating current output by the controller can be passed into the conductive coil of the heating component. Under the action of the alternating current, the conductive coil can generate an alternating magnetic field. Since the conductive coil is arranged around the battery, the ferromagnetic material inside the battery is placed in the alternating magnetic field, and eddy currents are induced under the action of the alternating magnetic field. The eddy currents can cause the charge carriers in the ferromagnetic material to move at high speed and randomly, and generate heat energy by colliding and rubbing against each other with atoms. This achieves a self-heating effect inside the battery, thereby triggering thermal runaway of the battery. Furthermore, since the thermal runaway triggering device of this application can heat the battery without relying on heat transfer, the thermal conversion efficiency is high, even reaching 95%, which can simulate the battery thermal runaway scenario more realistically and improve the accuracy of the test results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0017] Figure 1 A three-dimensional structural diagram of the remaining part of the thermal runaway triggering device provided in the embodiments of this application after the controller is missing;

[0018] Figure 2 for Figure 1 A schematic diagram of the base and fixing components in the thermal runaway triggering device shown;

[0019] Figure 3 for Figure 1 A schematic diagram of the heating component in the thermal runaway triggering device is shown.

[0020] Figure 4 for Figure 3 A schematic diagram of the structure of the two heating units in the heating assembly shown after disassembly;

[0021] Figure 5 for Figure 3 A schematic diagram of the structure of the two mating connectors in the heating assembly shown;

[0022] Figure 6 for Figure 5 A schematic diagram of the structure of the first and second plugs in the connector shown;

[0023] Figure 7 for Figure 3 The diagram shows the electrical connections between the four wires, four connectors, and the two output terminals of the controller in the two heating units.

[0024] The following are the labeling elements in the figure:

[0025] 20. Battery; 10. Thermal runaway trigger device; 100. Fixing assembly; 110. Back plate; 120. Fixing block; 130. Movable block; 140. Base; 141. Chassis; 142. Tubular part; 150. Connecting rod; 160. Adjusting component; 170. Clamping surface; 200. Base; 210. Receiving groove; 220. Fixing pin; 230. Seat body; 240. Receiving part; 250. Fixing bolt; 300. Heating assembly; 310. Heating unit; 311. Protective layer; 312. Coil layer; 312 a. Wire; 313. Insulation layer; 320. First plug; 321. Main fluid; 322. First contact; 323. First sub-fluid; 324. Buffer sleeve; 325. First connector; 330. Second plug; 331. Second contact; 332. Second sub-fluid; 333. Second connector; 334. Secondary fluid; 340. Mounting base; 341. Mounting surface; 342. First guide surface; 343. Second guide surface; 350. Connector; 400. Controller; 410. Output pole. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] Please refer to the following: Figures 1 to 7 The thermal runaway triggering device 10 of this application embodiment is used to trigger thermal runaway in a battery 20 (not shown) containing a ferromagnetic material. The thermal runaway triggering device 10 includes a fixing component 100, a heating component 300, and a controller 400. The fixing component 100 is used to fix the battery 20. The controller 400 is capable of outputting alternating current. The heating component 300 has a conductive coil connected to the controller 400, the conductive coil being arranged around the battery 20, and generating an alternating magnetic field around the ferromagnetic material under the action of alternating current.

[0031] In the aforementioned thermal runaway triggering device 10, the alternating current output by the controller 400 can be supplied to the conductive coil of the heating component 300. Under the action of the alternating current, the conductive coil can generate an alternating magnetic field. Since the conductive coil is arranged around the battery 20, the ferromagnetic material inside the battery 20 is placed in the alternating magnetic field, and eddy currents are induced under the action of the alternating magnetic field. The eddy currents can cause the charge carriers in the ferromagnetic material to move at high speed and randomly, and to collide and rub against each other with atoms to generate heat energy, thereby achieving a self-heating effect inside the battery 20, thus triggering the thermal runaway of the battery 20. Furthermore, since the thermal runaway triggering device 10 of this application can heat the battery 20 without relying on heat transfer, the thermal conversion efficiency is high, even reaching 95%, which can simulate the thermal runaway scenario of the battery 20 more realistically, thus improving the accuracy of the test results.

[0032] Thus, the thermal runaway triggering device 10 designed using the principle of electromagnetic induction in this application abandons the traditional method of heat transfer through contact between the heat source and the surface of the battery 20. It makes full use of the ferromagnetic characteristics of the battery 20 and directly constructs an alternating magnetic field outside the battery 20 to achieve self-heating of the battery 20 in a non-contact manner, thereby avoiding the problems of complex structural components, poor contact at the contact surface, and heat loss in the transfer path in the contact heat transfer scheme.

[0033] Combination Figure 1 and Figure 2As shown, in this application, the fixing assembly 100 includes a back plate 110, a fixing block 120, and a movable block 130. The fixing block 120 is connected to the back plate 110 and fixed relative to the back plate 110. The movable block 130 is movably connected to the back plate 110 and, together with the fixing block 120, clamps or releases the battery 20. By moving the movable block 130 relative to the back plate 110, the relative positions of the movable block 130 and the fixing block 120 can be changed, thereby allowing them to cooperate to clamp or release the battery 20.

[0034] Specifically, the fixing assembly 100 also includes a base 140, a connecting rod 150, and an adjusting member 160. The base 140 includes a chassis 141 and a tubular portion 142 connected to the chassis 141. The chassis 141 is fixedly installed on the back plate 110. The fixing block 120 is fixedly installed on the inner wall of the tubular portion 142. The connecting rod 150 passes through the tubular portion 142 radially and is connected at one end to a movable block 130. The adjusting member 160 is threadedly connected to the connecting rod 150 on the periphery of the tubular portion 142. It can be understood that one end of the battery 20 needs to be along the axial direction of the tubular portion 142 (i.e., the first direction mentioned later). Figure 1 and Figure 2 The movable block 130 extends into the internal space enclosed by the tubular part 142 in the direction of X and is placed close to the fixed block 120. By rotating the adjusting member 160 and the connecting rod 150 relative to each other, the length of the connecting rod 150 extending into the internal space of the tubular part 142 is increased. As a result, the connecting rod 150 drives the movable block 130 to gradually approach the battery 20. Finally, the movable block 130 and the fixed block 120 clamp the battery 20 together. Conversely, by rotating the adjusting member 160 and the connecting rod 150 in opposite directions, the movable block 130 can be gradually moved away from the battery 20, thereby releasing the battery 20.

[0035] In this application, the adjusting member 160 is a nut fixed to the outer wall of the tubular portion 142, and the connecting rod 150 is provided with an external thread that engages with the adjusting member 160. Furthermore, the end of the connecting rod 150 is rotatably connected to the movable block 130, so that when the connecting rod 150 rotates relative to the adjusting member 160, it does not cause the movable block 130 to rotate synchronously, but only causes the movable block 130 to move radially along the tubular portion 142, moving closer to or away from the fixed block 120.

[0036] In this application, both the movable block 130 and the fixed block 120 are mounted on the base 140 and indirectly connected to the back plate 110. In other embodiments, the base 140 can be omitted, and the fixed block 120 and the movable block 130 can be directly connected to the back plate 110. Then, an auxiliary driving component can be provided to drive the movable block 130 to move relative to the fixed block 120.

[0037] In this application, the chassis 141 and the tubular portion 142 are integrally connected structures, stacked along the axial direction of the tubular portion 142, and their inner diameters are equal, forming a cylindrical internal space. The outer diameter of the tubular portion 142 is smaller than the outer diameter of the chassis 141, but its height is greater than the height of the chassis 141. The chassis 141 is fixedly connected to the back plate 110 by fixing bolts 250, and the battery 20 can be initially fixed using the internal space of the tubular portion 142.

[0038] Both the fixed block 120 and the movable block 130 have arc-shaped clamping surfaces 170, and the two clamping surfaces 170 can closely adhere to the outer surface of the cylindrical battery 20, thereby jointly holding the battery 20 to restrict its movement. Due to the presence of the movable block 130, the connecting rod 150, and the adjusting member 160, the movable block 130 and the fixed block 120 can work together to clamp cylindrical batteries 20 of various diameters, thus improving applicability.

[0039] Since the fixing component 100 will be in direct contact with the test battery 20, in order to prevent heat damage and loss, the fixing block 120 and the movable block 130 are made of materials with high heat resistance and low thermal conductivity, especially wood materials with fire-retardant coating.

[0040] In other embodiments, the shapes of the clamping surfaces 170 on the fixed block 120 and the movable block 130, as well as the shape of the tubular portion 142, can also be changed. For example, the clamping surface 170 can be set as a plane, and the internal space of the tubular portion 142 can be set as a cube, so as to fix the square battery 20 and the pouch battery 20. In this way, by replacing different fixing components 100, the thermal runaway triggering device 10 can be directly applied to the testing of any type of battery 20, including cylindrical, square, and pouch batteries 20, as long as the battery 20 itself contains ferromagnetic material, thus improving the applicability of the thermal runaway triggering device 10.

[0041] Continue reading Figures 1 to 2 In this application, the thermal runaway triggering device 10 includes a base 200, which forms a receiving groove 210 extending along a first direction. At least a portion of the heating component 300 can be accommodated within the receiving groove 210, and the heating component 300 is slidably connected to the base 200 along the first direction. A fixing component 100 is fixedly connected to the base 200 and located on one side of the base 200 along the first direction.

[0042] It is understood that, since the fixing component 100 is located on one side of the base 200 along the first direction, after the battery 20 is fixed by the fixing component 100, the portion of the battery 20 exposed by the fixing component 100 will be suspended within the receiving groove 210 enclosed by the base 200. In this application, the receiving groove 210 is semi-circular, and the heating component 300 is also generally cylindrical, so that half of the heating component 300 can be accommodated within the receiving groove 210. By slidingly connecting the heating component 300 and the base 200 along the first direction, the heating component 300 can be fitted around the battery 20. By changing the position of the heating component 300 in the first direction, the conductive coil inside the heating component 300 can freely select the location of the battery 20 that needs to be heated, which also helps the heating component 300 to heat batteries 20 of various sizes, thereby improving the applicability of the thermal runaway triggering device 10. In other embodiments, the shape of the receiving groove 210 is not limited to semi-circular, as long as it is changed according to the shape of the battery 20 to be tested to accommodate the battery 20 and part of the heating component 300.

[0043] In this application, the heating component 300 and the base 200 are slidably connected at two points through the cooperation of two sets of slide rails and slide grooves. The base 200 has multiple pin holes (not shown) spaced apart along a first direction at the positions corresponding to the two slidably connected points. These pin holes extend perpendicular to the first direction and penetrate the base 200. After the heating component 300 is positioned relative to the base 200, fixing pins 220 are inserted into the corresponding pin holes and pressed against the heating component 300. Thus, the multiple fixing pins 220 work together to fix the relative position of the heating component 300 and the base 200. In other embodiments, the base 200 and the heating component 300 can also be connected by a slot and a buckle engaging.

[0044] In this application, the base 200 includes a base body 230 and a receiving portion 240 connected to the base body 230. A receiving groove 210 is formed in the receiving portion 240. A fixing hole (not shown) is provided on the base body 230. A fixing bolt 250 can pass through the fixing hole and connect to external environmental elements such as the ground, thereby fixing the entire base 200. Specifically, the receiving portion 240, the base body 230, and the back plate 110 of the fixing assembly 100 are connected as an integral structure, which can reduce the use of connecting components and improve the reliability of the overall structure. The back plate 110 is located on one side of the base 200 and can play a blocking role to prevent the internal material of the battery 20 from splashing to the surroundings in the event of thermal runaway.

[0045] Combination Figure 1 , Figure 3 and Figure 4As shown, in this application, the heating assembly 300 includes multiple heating units 310, which are detachably connected end-to-end and together form a ring structure surrounding the battery 20. Each heating unit 310 has a coil layer 312, and the coil layers 312 of the multiple heating units 310 are electrically connected and together constitute a conductive coil. By dividing the heating assembly 300 into multiple detachable and combinable heating units 310, the structure of the heating assembly 300 becomes more flexible. Furthermore, while the multiple heating units 310 are combined and connected to each other, the conductive coil layers 312 inside each heating unit 310 are connected in series or parallel to form a complete current transmission path after final connection with the controller 400.

[0046] Specifically in this application, such as Figure 3 , Figure 4 As shown, there are two heating units 310, each with a semi-circular cylindrical structure. When connected, they form a tubular heating assembly 300. In other embodiments, the heating units 310 can be three, four, or other quantities. Furthermore, the shapes of the multiple heating units 310 can differ from each other. For example, one heating unit 310 can be a 1 / 3 circle, and another heating unit 310 can be a 2 / 3 circle. Additionally, all the heating units 310 can be connected to form a tubular heating assembly 300 with a rectangular cross-section.

[0047] Combination Figure 1 , Figure 3 and Figure 4 As shown in this application, the two heating units 310 are arranged vertically along the direction of gravity. The heating unit 310 located below is housed in the receiving groove 210 of the base 200, so that the entire heating assembly 300 and the battery 20 are arranged in a flat position. In other embodiments, the heating assembly 300 and the battery 20 can also be arranged in an upright position.

[0048] In this application, all heating units 310 have the same structure, each including a protective layer 311 and a heat insulation layer 313. The protective layer 311, coil layer 312, and heat insulation layer 313 are arranged sequentially from the inside to the outside along the annular structure. It can be understood that after multiple heating units 310 are interconnected and surround the battery 20, the protective layer 311 is located in the innermost ring closest to the battery 20, while the heat insulation layer 313 is located in the outermost ring furthest from the battery 20, and the coil layer 312 is located between the protective layer 311 and the heat insulation layer 313.

[0049] The protective layer 311 is made of a rigid material, such as ceramic, so that the protective layer 311 can protect the coil layer 312 from various impacts during each test experiment. The coil layer 312 is composed of conductive wires (i.e., conductors 312a), such as copper wire, and the number of conductors 312a can be determined according to the strength of the induced magnetic field to be generated. Specifically, in this application, two copper conductors 312a are used to form the coil layer 312. The heat insulation layer 313 can prevent the heat generated by the coil layer 312 from dissipating outward.

[0050] Combination Figure 1 , Figures 3 to 7 As shown, specifically in this application, the heating assembly 300 includes a first plug 320 and a second plug 330. For two connected heating units 310, the first plug 320 is electrically connected to the coil layer 312 of one heating unit 310, and the second plug 330 is electrically connected to the coil layer 312 of the other heating unit 310. The first plug 320 and the second plug 330 are plugged in and out. It can be understood that the coil layers 312 of the two heating units 310 are electrically connected through the plugging and unplugging connection of the first plug 320 and the second plug 330. At the same time, during the plugging and unplugging process of the first plug 320 and the second plug 330, the two heating units 310 also achieve a structurally detachable connection.

[0051] Specifically, the first plug 320 and the second plug 330 are plugged in and unplugged along a first direction, thereby connecting the two heating units 310 in the first direction (i.e., laterally detachable). In other embodiments, the first plug 320 and the second plug 330 can also be plugged in and unplugged along a vertical direction perpendicular to the first direction (i.e., vertically detachable). In other embodiments, the two heating units 310 can also be detachably connected by other means such as contact or magnetic attraction, and can be selected as laterally or vertically detachable as needed.

[0052] In this application, the first plug 320 includes a main fluid 321, a first contact 322, and a first sub-fluid 323. The main fluid 321 is electrically connected between the controller 400 and the first contact 322. One end of the first sub-fluid 323 is electrically connected to the main fluid 321, and the other end is electrically connected to the coil layer 312 of one of the heating units 310. The second plug 330 includes a second contact 331 and a second sub-fluid 332. One end of the second sub-fluid 332 is electrically connected to the second contact 331, and the other end is electrically connected to the coil layer 312 of another heating unit 310. The first contact 322 and the second contact 331 can be plugged in and out to achieve electrical connection.

[0053] Specifically, the first contact 322 is cylindrical, and the second contact 331 is tubular with an internal insertion hole. The first contact 322 can extend into the insertion hole and is tightly fitted against the inner wall of the second contact 331 surrounding the insertion hole to achieve electrical connection. The first plug 320 also includes a buffer sleeve 324, which wraps around the first contact 322. The outer surface of the buffer sleeve 324 is a retractable rubber ring, and the inner surface contains a spring. When the first contact 322 extends into the insertion hole of the second contact 331, it will compress the buffer sleeve 324. The buffer sleeve 324 can retract to provide cushioning, preventing the end of the first contact 322 from colliding with the second contact 331 inside the second contact 331 and being damaged. It should be noted that in other embodiments, the insertion hole can be located on the first contact 322, and the buffer sleeve 324 can be located on the second contact 331.

[0054] Specifically, the first plug 320 further includes a first connector 325, which connects the main fluid 321 and the first contact 322, and is cylindrical with a smaller thickness and a larger radius than the first contact 322. One end of the first sub-fluid 323 is tightly fitted onto the outer surface of the main fluid 321, and the other end extends in a rod-like shape away from the main fluid 321. Specifically, the second plug 330 further includes a second connector 333 and a secondary fluid 334, which connects the secondary fluid 334 and the second contact 331, and is cylindrical with a smaller thickness and a larger radius than the second contact 331. One end of the second sub-fluid 332 is tightly fitted onto the outer surface of the secondary fluid 334, and the other end extends in a rod-like shape away from the secondary fluid 334. In other embodiments, the first connector 325, the second connector 333, and the guiding fluid may be omitted, thereby allowing the main fluid 321 to be directly connected to the first contact 322 and the second sub-guide fluid 332 to be directly connected to the second contact 331.

[0055] Continue reading Figure 1 , Figures 3 to 7 Specifically, in this application, there are multiple first plugs 320 and multiple second plugs 330; the coil layer 312 has multiple wires 312a, and the number of wires 312a in the coil layer 312 of the multiple heating units 310 is equal; the end of any wire 312a is electrically connected to the first sub-conductor 323 or the second sub-conductor 332; each first plug 320 and / or each second plug 330 connected to the ends of the multiple wires 312a in the coil layer 312 located on the same side is fixed on the same mounting base 340.

[0056] It is understood that in this application, the first sub-conductor 323 and the second sub-conductor 332 are each electrically connected to only one wire 312a within the coil layer 312. Therefore, at the ends of multiple wires 312a on the same side of the heating unit 310, a number of first plugs 320 and / or second plugs 330, equal to the number of wires 312a, are required for corresponding connection. Alternatively, two first plugs 320 can be connected to both ends of the same wire 312a, or two second plugs 330 can be connected to both ends of the same wire 312a; or one first plug 320 and one second plug 330 can be respectively connected to both ends of the same wire 312a.

[0057] Combination Figures 3 to 7 As shown in this application, for the same heating unit 310, the ends of the two internal wires 312a located on the same side are respectively connected to the first sub-conductor 323 and the second sub-conductor 332. Therefore, one side of the heating unit 310 needs to be simultaneously connected to a first plug 320 and a second plug 330. The first plug 320 and the second plug 330 are fixed to the same mounting base 340, thus forming a connector 350. Similarly, the connector 350 on another heating unit 310 also has a mounting base 340, a first plug 320, and a second plug 330. The first plug 320 and the second plug 330 on the two connectors 350 can be plugged in and out, thereby achieving a mating connection between the two connectors 350.

[0058] It should be noted that in other embodiments, the mounting base 340 of one connector 350 may be equipped with first plugs 320, so that the ends of multiple wires 312a on the same side of one heating unit 310 are all connected to the first plugs 320. Meanwhile, the ends of multiple wires 312a on the same side of another heating unit 310 that connects to the same heating unit 310 need to be connected to the second plugs 330. Thus, the mounting base 340 of the connector 350 connected to the other heating unit 310 will be equipped with second plugs 330, thereby enabling the plugging and unplugging connection of the two connectors 350. Alternatively, when there are more than two wires 312a in the coil layer 312 and both first plugs 320 and second plugs 330 are provided on the mounting base 340 of the connector 350, the number of first plugs 320 and second plugs 330 may be equal or unequal.

[0059] It is understood that in this application, the two heating units 310 require four connectors 350 to be connected in pairs to realize the electrical connection of multiple wires 312a in the two coil layers 312.

[0060] In this application, two connectors 350 are plugged in and out along a first direction, so that the main guide fluid 321 extends and protrudes beyond the mounting base 340 along the first direction to facilitate connection with the controller 400, while the secondary guide fluid 334, which is shorter along the first direction, is completely enclosed inside the mounting base 340. Specifically, the first sub-guide fluid 323 and the second sub-guide fluid 332 both protrude vertically beyond the mounting base 340 to electrically connect with the wires 312a in the coil layer 312. In addition, the first connector 325 and the second connector 333 are both enclosed inside the mounting base 340. Due to their large diameter, they can act on the mounting base 340 during plugging and unplugging to prevent the first plug 320 and the second plug 330 from moving relative to the mounting base 340 as a whole.

[0061] Specifically, the mounting base 340 has a mounting surface 341, and a first contact 322 and a second contact 331 protrude from the mounting surface 341 along a first direction. The two connectors 350 to be connected are inverted, and the mounting surfaces 341 of the two mounting bases 340 face each other. As the two heating units 310 move relative to each other along the first direction, the two mounting bases 340 translate relative to each other, thereby achieving the insertion and removal of the first contact 322 and the second contact 331.

[0062] Furthermore, the mounting base 340 has a first guide surface 342 and a second guide surface 343. The first guide surface 342, the mounting surface 341, and the second guide surface 343 are connected sequentially and are arranged in a "Z" shape. The mounting surface 341 and the second guide surface 343 form a mating groove, so the mounting base 340 presents an "L" shaped structure. The first contact body 322 and the second contact body 331 protrude from the mounting surface 341 and are axially parallel to the first guide surface 342 and the second guide surface 343. During the process of the two connectors 350 being connected by an overturned connection, the first guide surface 342 on one mounting base 340 can be tightly attached to the second guide surface 343 on the other mounting base 340. As the two heating units 310 move relative to each other in the first direction, the first guide surface 342 and the second guide surface 343 remain in contact to guide the relative translation of the two mounting bases 340.

[0063] In this application, for the two connectors 350 connected to the heating unit 310 which is located at a high position in the vertical direction, each of them has a portion that extends radially beyond the heating unit 310 and has a downward-facing surface. A slide rail or a slide groove may be provided on this surface to achieve a sliding connection with the base 200.

[0064] In this application, the controller 400 has multiple output poles 410, the frequency of the AC power output by each output pole 410 is adjustable, and the conductive coil has multiple current transmission paths, which are connected one-to-one to the multiple output poles 410.

[0065] It is understood that each output stage of the controller 400 can output current of a different frequency independently. Through the output terminal 410 of the controller 400, the frequency of the alternating current in the corresponding current transmission path can be freely adjusted, thereby flexibly adjusting the heating capacity of the battery 20.

[0066] In this application, the coil layer 312 of the heating unit 310 has two wires 312a, each wire 312a being connected in parallel with a wire 312a in another heating unit 310. The two coil layers 312 are connected by four connectors 350 to form two current transmission paths. The two current transmission paths are connected one-to-one with the two output poles 410 of the controller 400, so that the two output poles 410 can achieve single control of the current frequency in the two current transmission paths. In other embodiments, the number of current output paths can be changed according to the number of wires 312a in the coil layer 312 of the heating unit 310. In addition, the wires 312a in the two connected heating units 310 can also be electrically connected in series.

[0067] Combination Figures 1 to 7 As shown, when using the entire thermal runaway triggering device 10, the base 200 and the fixing assembly 100 are first fixed as a whole. Then, the heating assembly 300 is installed on the base 200, and then the battery 20 is fixed to the fixing assembly 100. When installing the heating assembly 300, the connector 350 and the heating unit 310 need to be spliced ​​together first to ensure that they are internally connected. Alternatively, the connector 350 and the heating unit 310 can be permanently fixed as a whole. Then, the heating unit 310 with the connector 350 and in a lower position is placed into the receiving groove 210 of the base 200 and fixed by the fixing pins 220 on both sides of the receiving groove 210. The fixing position can be selected according to the position of the battery 20 to be heated. Following this, the heating unit 310, equipped with connector 350 and positioned at a higher level, is connected to the base 200 via a slide rail and a sliding groove. This allows the heating unit 310 to move relative to the receiving groove 210 along a first direction. During the movement of the two heating units 310 in the first direction, the two sets of connectors 350 are inserted, allowing the coil layers 312 within the two heating units 310 to form a complete annular conductive coil. Finally, each output pole 410 of the controller 400 is connected to the main fluid 321 on the first plug 320 of two diagonally arranged connectors 350. Adjusting the output current of the output pole 410 activates the entire thermal runaway trigger device 10.

[0068] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A thermal runaway triggering device for triggering thermal runaway of a battery having a ferromagnetic body inside, characterized in that, The thermal runaway triggering device comprises a fixing assembly, a heating assembly and a controller; the fixing assembly is used for fixing the battery; the controller can output alternating current; the heating assembly has a conductive coil connected with the controller, the conductive coil is arranged around the battery, and an alternating magnetic field is generated around the ferromagnetic body under the action of the alternating current.

2. The thermal runaway trigger device of claim 1, wherein, The heating assembly comprises a plurality of heating units, the plurality of heating units are sequentially and detachably connected, and jointly form an annular structure around the battery; the heating unit has a coil layer, the coil layers of the plurality of heating units are electrically connected and jointly constitute the conductive coil.

3. The thermal runaway trigger device of claim 2, wherein, The heating unit comprises a protective layer and a heat insulation layer, the protective layer, the coil layer and the heat insulation layer are sequentially arranged along the direction from the inside to the outside of the annular structure.

4. The thermal runaway trigger device of claim 2, wherein, The heating assembly comprises a first plug and a second plug, for the two connected heating units, the first plug is electrically connected with the coil layer of one of the heating units, the second plug is electrically connected with the coil layer of the other heating unit, and the first plug and the second plug are plug-connected.

5. The thermal runaway trigger device of claim 4, wherein, The first plug comprises a main fluid, a first contact body and a first sub fluid, the main fluid is electrically connected between the controller and the first contact body, one end of the first sub fluid is electrically connected with the main fluid, and the other end is electrically connected with the coil layer of one of the heating units; the second plug comprises a second contact body and a second sub fluid, one end of the second sub fluid is electrically connected with the second contact body, and the other end is electrically connected with the coil layer of the other heating unit; the first contact body and the second contact body can be plug-connected to realize electrical connection.

6. The thermal runaway trigger device of claim 5, wherein, The first plug and the second plug are both a plurality of; the coil layer has a plurality of wires, the number of wires in the coil layer of the plurality of heating units is equal; the end of any wire is electrically connected with the first sub fluid or the second sub fluid; each first plug and / or each second plug connected with the ends of the wires on the same side in the coil layer is fixed on the same mounting seat.

7. The thermal runaway trigger device of any one of claims 1 to 6, wherein, The controller has a plurality of output poles, the frequency of the alternating current output by each output pole is adjustable; the conductive coil has a plurality of current transmission paths, and each current transmission path is connected with one output pole.

8. The thermal runaway trigger device of claim 1, wherein, The fixing assembly comprises a back plate, a fixed block and a movable block, the fixed block is connected with the back plate and is fixed relative to the back plate, and the movable block is movably connected with the back plate and clamps or releases the battery together with the fixed block.

9. The thermal runaway trigger device of claim 8, wherein, The fixing assembly comprises a base, a connecting rod and an adjusting piece, the base comprises a bottom disc and a tubular part connected with the bottom disc, the bottom disc is fixedly installed on the back plate, the fixed block is fixedly installed on the inner wall surface of the tubular part, the connecting rod penetrates through the tubular part along the radial direction of the tubular part, and one end of the connecting rod is connected with the movable block, and the adjusting piece is threadedly connected with the connecting rod at the periphery of the tubular part.

10. The thermal runaway trigger device of claim 1, wherein, The thermal runaway triggering device comprises a base, the base surrounds a containing groove extending along a first direction, at least part of the heating assembly can be contained in the containing groove, the heating assembly is in sliding connection with the base along the first direction; the fixing assembly is in fixed connection with the base and is located on one side of the base along the first direction.

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