Power battery mounting bolt, power battery assembly and vehicle

Abstract

The application provides a power battery mounting bolt, a power battery assembly and a vehicle, and belongs to the technical field of power battery mounting. The power battery mounting bolt can make the power battery body separate from the vehicle body by destroying the structure of the power battery mounting bolt, avoid the fire caused by the self-ignition of the power battery body from spreading to the vehicle body, avoid the vehicle body from catching fire, effectively protect the driver and passengers in the vehicle, and minimize the damage to the vehicle body. The cross section of the weakened groove is V-shaped, so that the amount of explosive can be reduced. The weakened groove is arranged close to the head, so that the area where the weakened groove is located is more prone to fracture, and the self-destruction is ensured to be successful. The electric heating wire is used to heat the explosive, the explosive is ignited by adopting the way of using open fire, the structure of the ignition device is simpler, and the use reliability is stronger. The limiting protrusion is arranged to avoid the isolation block from falling off from the stud, the position of the internal explosive is stable, and the use reliability is improved.

Description

Technical Field

[0001] This application belongs to the field of power battery installation technology, and more specifically, relates to a power battery mounting bolt, a power battery assembly, and a vehicle. Background Technology

[0002] With the popularization of new energy vehicles, their safety has also received widespread attention. Among new energy vehicles, fires caused by power batteries are a significant safety concern, posing the following main threats: First, spontaneous combustion of the power battery not only produces high-temperature toxic gases but also poses an explosion hazard; second, once the power battery catches fire, the fire spreads rapidly, reaching the passenger compartment in about one minute, seriously threatening the lives of the occupants; third, fires in new energy vehicles are intense and generally difficult to extinguish, causing significant damage to the entire vehicle and a high probability of total loss, resulting in substantial economic losses.

[0003] Currently, after a fire caused by a power battery, the main consideration is how to improve the chances of people escaping, making it difficult to simultaneously address the need to reduce vehicle damage. This results in high losses for car owners after a fire, hindering the promotion of new energy vehicles. Utility Model Content

[0004] The purpose of this application is to provide a power battery mounting bolt, a power battery assembly, and a vehicle, aiming to solve the problem that after a fire in a new energy vehicle, it is difficult to balance improving personnel safety and reducing the degree of vehicle damage in the handling solution.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a power battery mounting bolt, comprising:

[0007] The bolt body has a stud and a head that are connected to each other. The stud is a hollow component and its inner cavity forms an outlet opening at the end opposite to the head.

[0008] An ignition device includes an isolation block and an ignition lead electrode. The isolation block is inserted into the inner cavity of the stud and blocks the lead-out opening, so that a filling chamber is formed between the isolation block and the closed end of the inner cavity of the stud. The filling chamber is filled with explosive. The ignition lead electrode is disposed through the isolation block, with one end extending out of the lead-out opening and the other end extending into the filling chamber to form an ignition part.

[0009] The filling chamber is provided with a weakening groove, and the opening direction of the weakening groove is set at an angle to the long axis direction of the stud.

[0010] The power battery is typically bolted to the vehicle body. It usually monitors vehicle parameters such as speed, door status, and battery operation. If the power battery catches fire, it will quickly activate the vehicle's emergency response mechanism, ensuring the vehicle speed decreases and doors open rapidly, allowing occupants to escape quickly and ensuring their safety. While this method effectively protects the occupants, it cannot protect the vehicle itself. Firefighting efforts are usually only possible after the fire has started, often resulting in severe damage to the vehicle and a high risk of total loss for the owner.

[0011] To mitigate the significant losses suffered by vehicle owners after a power battery fire, the solution presented in this application, compared to existing technologies, employs a power battery mounting bolt. This bolt, with its stud and head, possesses the basic functions of a bolt. Under normal assembly conditions, the bolt connects the power battery to the vehicle body, which is electrically connected via a battery harness to supply power. If the power battery catches fire, the ignition device is activated. The ignition part of the device conducts electricity and heats up through the ignition lead electrode until it ignites the explosive. The energy from the explosion is transferred to the stud. Since the weakened groove on the stud is the weakest area and is located near the head, it breaks first, causing the head to separate from the stud. The bolt connection fails, allowing the power battery to detach from the vehicle body and fall to the ground. During the fall, the battery harness cannot withstand the weight of the power battery and breaks, completely separating the power battery from the vehicle body.

[0012] The power battery mounting bolts of this application have a self-destruct function after the power battery body catches fire. By destroying its own structure, the power battery body is detached from the vehicle body, preventing the fire from the power battery body from spreading to the vehicle body and thus preventing the vehicle body from catching fire. This not only effectively protects the occupants of the vehicle and ensures their personal safety, but also minimizes the damage to the vehicle body, thereby reducing the owner's losses to the greatest extent possible, thus meeting the needs of both safety and minimizing the owner's losses. In addition, by setting up an isolation block to seal the lead-out opening, it also supports the ignition lead-out electrode, integrating the functions of sealing and support, further simplifying the structure of the ignition device and preventing the explosive from getting damp.

[0013] In conjunction with the first aspect, in one possible implementation, the weakening groove has a first sidewall and a second sidewall distributed along the length direction of the stud, and the distance between the first sidewall and the second sidewall gradually increases in the opening direction of the weakening groove, so that the cross-section of the weakening groove is V-shaped.

[0014] In the above technical solution, the first and second sidewalls can more effectively absorb the impact energy and generate a tear initiation point at the bottom of the groove, which is conducive to improving the reliability of the stud breakage after the explosion. Combined with the impact energy on the inner wall of the filling chamber, effective tearing at the bottom of the V-shaped groove can be achieved with a smaller amount of explosives.

[0015] In some embodiments, both the first sidewall and the second sidewall are straight sidewalls, and the opening direction of the weakening groove is perpendicular to the length direction of the stud.

[0016] In the above technical solution, when an explosion occurs, the first and second sidewalls can fully withstand the energy of the explosion impact. The two sidewalls are subjected to opposing forces, which can cause tearing at the bottom of the groove. The design that the opening direction is perpendicular to the length direction of the stud can maximize the impact energy borne by the first and second sidewalls and reduce the processing difficulty of the weakening groove.

[0017] In conjunction with the first aspect, in one possible implementation, the weakening groove is positioned close to the head.

[0018] In the above technical solution, the weakening groove is set near the head. Taking advantage of the fact that stress tends to concentrate in the area where the head and stud meet, the area where the weakening groove is located is more likely to fracture, thus ensuring successful self-destruction.

[0019] In conjunction with the first aspect, in one possible implementation, the ignition lead-out electrodes are provided in two sets, and the ignition device further includes a heating wire located in the filling chamber, with its two ends respectively connected to the two sets of ignition lead-out electrodes, and the heating wire being the ignition part.

[0020] In the above technical solution, the explosive is heated by an electric heating wire, avoiding the use of open flame to ignite the explosive. The ignition device has a simpler structure and is easier to ignite the explosive, making it more reliable in use.

[0021] In some embodiments, a limiting protrusion is provided on the inner side of the outlet opening, and the limiting protrusion contacts the end of the isolation block to limit the displacement of the isolation block in a direction away from the head.

[0022] In the above technical solution, the limiting protrusion can prevent the spacer block from falling out of the stud, while the spacer block can limit the explosive. By keeping the spacer block in a stable position, the position of the internal explosive can be kept stable, thus improving the reliability of use.

[0023] In some embodiments, the limiting protrusion is annular, and a first limiting slope is formed on the side facing the head. The first limiting slope gradually slopes inward in the direction away from the head. A second limiting slope is formed on the outer periphery of one end of the isolation block. The second limiting slope fits against the first limiting slope to limit the displacement of the isolation block in the direction away from the head.

[0024] In the above technical solution, the limiting of the stud in the axial direction is achieved by the fit between the second limiting inclined surface and the first limiting inclined surface. The end face of the isolation block can be set to be flush with the open end face of the stud, which is conducive to improving the structural compactness of the power battery mounting bolt in the axial direction, and can also shorten the length of the ignition lead electrode and reduce its material usage.

[0025] In some embodiments, the end of the ignition lead electrode that extends into the filling chamber has a hot wire mounting hole, the opening direction of the hot wire mounting hole is set at an angle to the long axis of the ignition lead electrode, and the end of the heating wire is inserted and fixed in the hot wire mounting hole.

[0026] In the above technical solution, the assembly reliability of the heating wire and the ignition lead electrode is improved by using a plug-in assembly method, thus preventing the heating wire from falling off.

[0027] Secondly, embodiments of this application also provide a power battery assembly, including a power battery body, a controller, a battery status sensor, and a plurality of the aforementioned power battery mounting bolts;

[0028] Multiple power battery mounting bolts are distributed circumferentially along the power battery body and can connect the power battery body to the vehicle body;

[0029] The controller is electrically connected to the ignition lead electrode in the power battery mounting bolt and the power battery body, respectively.

[0030] The battery status sensor is installed inside the power battery body to sense the internal operating status of the power battery body, and the battery status sensor is electrically connected to the controller.

[0031] The solution described in this application, compared to the prior art, uses the aforementioned power battery mounting bolts and a battery status sensor to sense the internal operating state of the power battery body. If a fire is detected in the power battery, the controller activates the ignition device. The ignition part of the ignition device ignites the explosive. After the explosive detonates, the weakened groove breaks first, and the head separates from the stud. The bolt body connection fails, and the power battery body can detach from the vehicle body and fall to the ground. During the fall of the power battery body, the battery wiring harness breaks, and the power battery body completely separates from the vehicle body. The power battery assembly of this application not only effectively protects the occupants of the vehicle but also minimizes the damage to the vehicle body, taking into account both safety and reducing losses for the owner.

[0032] Thirdly, embodiments of this application also provide a vehicle including the aforementioned power battery assembly.

[0033] Compared with the prior art, the solution shown in this application embodiment, by adopting the above-mentioned power battery assembly, can not only effectively protect the occupants of the vehicle, but also minimize the damage to the vehicle body, taking into account both safety and reducing the owner's losses, which is conducive to improving the competitiveness of the vehicle. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a front view schematic diagram of the power battery mounting bolt provided in Embodiment 1 of this application;

[0036] Figure 2 This is a three-dimensional structural diagram of the power battery mounting bolt provided in Embodiment 1 of this application;

[0037] Figure 3 for Figure 1 Schematic diagram of the internal structure of the mounting bolts for the power battery;

[0038] Figure 4 for Figure 3 Schematic diagram of the main body of the bolt;

[0039] Figure 5 for Figure 3 A partial structural diagram of the stud, head, and weakening groove;

[0040] Figure 6 for Figure 3Enlarged view of the local adaptation between the central ignition point and the explosive;

[0041] Figure 7 for Figure 3 Enlarged view of the partial fit between the stud and the spacer block;

[0042] Figure 8 This is a schematic diagram of the power battery assembly provided in Embodiment 2 of this application;

[0043] Figure 9 This is a perspective view of the assembly of the power battery body and the power battery mounting bolts used in Embodiment 2 of this application;

[0044] Figure 10 This is an assembly side view of the power battery mounting bolts and connecting edges used in Embodiment 2 of this application;

[0045] Figure 11 This is a side view of the assembly of the power battery mounting bolts and connecting edges used in Embodiment 2 of this application.

[0046] In the diagram: 1. Bolt body; 110. Stud; 111. Lead-out opening; 112. Limiting protrusion; 1121. First limiting inclined surface; 120. Head; 2. Ignition device; 210. Ignition lead-out electrode; 211. Hot wire assembly hole; 220. Isolation block; 221. Second limiting inclined surface; 222. Electrode through hole; 230. Heating wire; 201. Ignition part; 3. Filling chamber; 4. Explosive; 5. Weakening groove; 510. First side wall; 520. Second side wall; 6. Reference surface; 7. Controller; 8. Battery; 9. Battery harness; 10. Sensing harness; 11. Power supply harness; 12. Vehicle body; 13. Nut seat; 14. Control harness; 15. Power battery body; 1510. Connecting edge; 1520. Connecting sleeve; 1530. Limiting pad; 16. Gasket. Detailed Implementation

[0047] 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.

[0048] It should be noted that when an element is referred to as being "set on" another element, it can be directly on that other element or indirectly on that other element. It should be understood that the terms "front" and "rear" correspond to the front-rear direction of the vehicle body, the terms "up" and "down" correspond to the vertical direction of the vehicle body, and the terms "left" and "right" correspond to the horizontal direction of the vehicle body. Other directional terms, unless otherwise expressly specified, such as "length," "width," "top," "bottom," "inner," and "outer," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and for 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, and therefore should not be construed as a limitation of this application.

[0049] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a few" means two or more, unless otherwise explicitly specified.

[0050] Please refer to the following: Figures 1 to 11 The following is a description of the power battery mounting bolts provided in this application. The power battery mounting bolt includes a bolt body 1 and an ignition device 2. The bolt body 1 has a stud 110 and a head 120 connected to each other. The stud 110 is a hollow component, and its inner cavity forms an outlet opening 111 at the end opposite to the head 120. The ignition device 2 has an isolation block 220 and an ignition outlet electrode 210. The isolation block 220 is inserted into the inner cavity of the stud 110 and blocks the outlet opening 111, so that a filling chamber 3 is formed between the isolation block 220 and the closed end of the inner cavity of the stud 110. The filling chamber 3 is filled with explosive 4. The ignition outlet electrode 210 is disposed through the isolation block 220, with one end extending out of the outlet opening 111 and the other end extending into the filling chamber 3 to form an ignition part 201. A weakening groove 5 is provided at the end of the filling chamber 3 near the head 120. The opening direction of the weakening groove 5 is set at an angle to the long axis direction of the stud 110.

[0051] In this embodiment, the stud 110 has external threads on its outer periphery, and the head 120 has a screwing groove (e.g., a cross-shaped groove, a slotted groove, or a hexagonal groove). The stud 110 and the head 120 of the bolt body are integrally formed through processes such as casting, avoiding seams between them, ensuring the integrity and structural strength of the bolt body, and thus better controlling the assembly performance of the bolt body. One end of the stud 110 has a lead-out opening 111, while the other end is closed, forming a hollow cylinder with a one-way opening.

[0052] In this embodiment, the explosive 4 is in block form (e.g., a block of explosives) and can be directly placed in the filling chamber 3, roughly filling the filling chamber 3, to prevent the explosive 4 from shaking in the filling chamber 3 during vehicle operation. The ignition part 201 of the ignition device 2 is embedded in the explosive 4. Alternatively, the explosive 4 is in powder form (e.g., ammonium nitrate fuel oil explosive). The explosive 4 needs to be filled in a relatively sealed charging container, and then the charging container is placed in the filling chamber 3. The charging container needs to be fixed in the filling chamber 3 by interference fit, bonding, or other means to prevent shaking during vehicle operation. The ignition part 201 of the ignition device 2 passes through the charging container and extends into the powder of the explosive 4.

[0053] The power battery is typically bolted to the vehicle body. It usually monitors vehicle parameters such as speed, door status, and battery operation. If the power battery catches fire, it will quickly activate the vehicle's emergency response mechanism, ensuring the vehicle speed decreases and doors open rapidly, allowing occupants to escape quickly and ensuring their safety. While this method effectively protects the occupants, it cannot protect the vehicle itself. Firefighting efforts are usually only possible after the fire has started, often resulting in severe damage to the vehicle and a high risk of total loss for the owner.

[0054] To mitigate the significant losses suffered by vehicle owners after a power battery fire, this application provides a power battery mounting bolt. Compared to existing technologies, the bolt body 1, having a stud 110 and a head 120, possesses the basic functions of a bolt. Under normal assembly conditions, the bolt body 1 can connect the power battery body 15 to the vehicle body 12. The power battery body 15 and the vehicle body 12 are electrically connected via a battery wiring harness 9 to supply power to the vehicle body 12. If the main body of the power battery 15 catches fire, the ignition device 2 is activated. The ignition part 201 of the ignition device 2 conducts electricity and heats up through the ignition lead electrode 210 until the explosive 4 is ignited. The energy after the explosive 4 explodes is transferred to the stud 110. Since the weakening groove 5 on the stud 110 is the weakest area on the stud 110 and is located close to the head 120, the weakening groove 5 breaks first, and the head 120 separates from the stud 110. The connection of the bolt body 1 fails, and the main body of the power battery 15 can detach from the vehicle body 12 and fall to the ground. During the process of the main body of the power battery 15 falling, the battery harness 9 cannot withstand the pull of the weight of the main body of the power battery 15 and breaks. The main body of the power battery 15 is completely separated from the vehicle body 12.

[0055] The power battery mounting bolts of this application have a self-destruct function after the power battery body 15 catches fire. By destroying its own structure, the power battery body 15 is detached from the vehicle body 12, preventing the fire from the power battery body 15 from spreading to the vehicle body 12 and preventing the vehicle body 12 from catching fire. This not only effectively protects the occupants of the vehicle and ensures their personal safety, but also minimizes the damage to the vehicle body 12, thereby minimizing the owner's losses and meeting the needs of both safety and minimizing the owner's losses. In addition, by setting the isolation block 220 to seal the lead-out opening 111, it also supports the ignition lead-out electrode 210, integrating the functions of sealing and support, further simplifying the structure of the ignition device 2 and preventing the explosive 4 from getting damp.

[0056] In some embodiments, see Figures 3 to 5 The weakening groove 5 is located near the head 120. The reason for this arrangement is that the area where the head 120 and the stud 110 intersect forms a stepped structure, which is prone to stress concentration. Compared with other locations on the head 120 and the stud 110, the structural strength of this area is relatively low. By placing the weakening groove 5 near the head 120, the stress concentration at the intersection of the head 120 and the stud 110 is utilized to make the area where the weakening groove 5 is located more likely to fracture, ensuring successful self-destruction.

[0057] In some embodiments, see Figure 5 The weakening groove 5 has a first sidewall 510 and a second sidewall 520 distributed along the length of the stud 110. In the opening direction of the weakening groove 5, the distance between the first sidewall 510 and the second sidewall 520 gradually increases, so that the cross-section of the weakening groove 5 is V-shaped. In this embodiment, the V-shaped groove design creates a stress concentration area at the bottom of the weakening groove 5. The first sidewall 510 and the second sidewall 520 can more effectively absorb the impact energy and create a tear initiation point at the bottom of the groove, which helps to improve the reliability of the stud 110 fracture after the explosion. Combined with the impact energy on the inner wall of the filling chamber 3, effective tearing at the bottom of the V-shaped groove can be achieved with a smaller amount of explosive 4.

[0058] Optionally, the first sidewall 510 and the second sidewall 520 are directly connected to the bottom area of ​​the groove to form a sharp corner. The sharp corner is more prone to tearing. By reasonably controlling the tear initiation point, the tearing path can be better controlled to ensure that the stud 110 can completely break.

[0059] In some more specific embodiments, see Figure 5Both the first sidewall 510 and the second sidewall 520 are straight sidewalls. During an explosion, the first sidewall 510 and the second sidewall 520 can fully withstand the energy of the blast impact, with opposing forces acting on each sidewall, resulting in tearing at the bottom of the groove. Therefore, the opening direction of the weakening groove 5 is perpendicular to the length direction of the stud 110. This maximizes the impact energy borne by the first sidewall 510 and the second sidewall 520 and reduces the machining difficulty of the weakening groove 5. Optionally, the weakening groove 5 is formed by CNC interpolation milling or laser processing. The included angle between the first sidewall 510 and the second sidewall 520 is 80°~45° (e.g., 60°, 70°, 75°), avoiding the problem of the weakening groove 5 having an excessively large opening that is difficult to tear, or an excessively large opening that leads to excessive machining difficulty.

[0060] In some other, more specific embodiments, not shown in the figures, the first sidewall 510 and the second sidewall 520 are both arc-shaped sidewalls, and the two arc-shaped sidewalls protrude relative to each other. This design can also achieve effective load-bearing and tear resistance.

[0061] In some embodiments, see Figure 5 With the interface between the stud 110 and the head 120 as reference surface 6, the edge of the weakening groove 5 does not protrude beyond reference surface 6, meaning that the weakening groove 5 will not intrude into the head 120. The weakening groove 5 fractures approximately along a direction perpendicular to the long axis of the stud 110, and its fracture path remains on the stud 110, making it difficult to extend into the head 120. If the weakening groove 5 is partially located in the head 120, the possibility of the crack extending into the head 120 is higher. Since the radial dimension of the head 120 is large, the crack needs to extend for a longer length to ensure fracture. However, an excessively long extension path will consume too much explosive energy. Under the same charge, a longer crack extension path means an increased risk of fracture failure. Since the outer wall of the stud 110 is relatively thin, the design of keeping the weakening groove 5 completely within the stud 110 avoids the fracture crack extending into the head 120, allowing the fracture crack to form within the stud 110, reducing the crack extension path, and ensuring the reliability of the fracture.

[0062] Optionally, the closed end face of the filling chamber 3 is flush with the reference surface 6. Without affecting the structural strength of the head 120, the volume of the filling chamber 3 is maximized, thereby increasing the amount of explosive 4 and ensuring successful self-destruction. More specifically, the opening edge of the weakening groove 5 is flush with the reference surface 6, making the tearing area of ​​the weakening groove 5 closer to the intersection area of ​​the head 120 and the stud 110.

[0063] In some embodiments, see Figure 3 and Figure 5The explosive 4 covers the opening of the weakening groove 5. The first sidewall 510 and the explosive 4 are spaced apart, as are the second sidewall 520 and the explosive 4. Because the explosive 4 covers the opening of the weakening groove 5, after the explosive 4 detonates, its impact energy can directly reach the weakening groove 5, avoiding energy loss due to an excessively long energy conduction path. Furthermore, the space between the explosive 4 and the first sidewall 510 and the second sidewall 520 forms an energy conduction path, which is more conducive to the targeted transfer of impact energy to the first sidewall 510 and the second sidewall 520. In this way, a smaller amount of explosive 4 is sufficient to meet the self-destruction requirement.

[0064] Optionally, to facilitate the filling of explosive 4, the outer peripheral sidewall of explosive 4 is flush with the opening end face of the weakening groove 5.

[0065] In some specific embodiments of the weakening groove 5 distribution, the weakening groove 5 is an annular groove continuously distributed along the circumference of the filling chamber 3, making the force on the stud 110 more uniform. Alternatively, the weakening groove 5 is an arc-shaped groove discontinuously distributed along the circumference of the filling chamber 3.

[0066] In some embodiments, see Figures 1 to 3 , Figures 6 to 8 Two sets of ignition lead-out electrodes 210 are provided, and the two sets of ignition lead-out electrodes 210 are respectively connected to the controller 7 through the control wiring harness 14, so that the controller 7 can energize the ignition lead-out electrodes 210. In addition, the ignition device 2 also includes a heating wire 230, which is located in the filling chamber 3 and is connected to the two sets of ignition lead-out electrodes 210 at both ends. The heating wire 230 is the ignition part 201. After the ignition lead-out electrodes 210 are energized, the heating wire 230 heats up, and the explosive 4 is ignited as the temperature rises. The two sets of ignition lead-out electrodes 210 are respectively connected to the positive and negative terminals of the controller 7.

[0067] This embodiment does not use an open flame to ignite the explosive 4. The ignition device 2 has a simpler structure and is easier to ignite the explosive 4, making it more reliable in use.

[0068] Optionally, the ignition lead electrode 210 can be a wire or a conductive busbar (such as a copper busbar). This is not a limitation, as long as it meets the requirements of electric heating.

[0069] Optionally, the isolation block 220 has an electrode through-hole 222. The ignition lead electrode 210 passes through the electrode through-hole 222 and is sealed to maintain the airtightness of the filling chamber 3, preventing the explosive 4 from getting damp. To achieve the sealed fit between the ignition lead electrode 210 and the electrode through-hole 222, after the ignition lead electrode 210 is inserted into the electrode through-hole 222, sealant is injected into the electrode through-hole 222. After the sealant cures, it can achieve a seal. The sealant can be, but is not limited to, epoxy resin sealant, polyurethane sealant, etc. Of course, the method of achieving the sealed fit between the ignition lead electrode 210 and the electrode through-hole 222 is not limited to the injection method. An elastic layer (such as a rubber layer) can also be wrapped around the ignition lead electrode 210. After the ignition lead electrode 210 is inserted, the elastic layer tightly abuts against the side wall of the electrode through-hole 222, thereby achieving a seal.

[0070] Optionally, the internal cavity of the isolation block 220 and the stud 110 is set in a conformal manner and can be made of an elastic material (such as rubber). The isolation block 220 is inserted into the stud 110 with an interference fit to achieve a seal. At the same time, the elastic material itself has a certain rigidity and can support the ignition lead electrode 210.

[0071] Optionally, the ignition lead can be implemented using, but is not limited to, tin-plated copper wire, which must have the characteristics of high temperature resistance and high voltage resistance. The heating wire 230 can be implemented using, but is not limited to, nickel-chromium alloy heating wire, copper-nickel alloy heating wire, tungsten heating wire, etc., which must have good high temperature resistance and oxidation resistance.

[0072] In some embodiments, see Figure 3 , Figure 4 and Figure 7 A limiting protrusion 112 is provided on the inner side of the outlet 111. The limiting protrusion 112 contacts the end of the isolation block 220 to limit the displacement of the isolation block 220 in a direction away from the head 120, thereby preventing the isolation block 220 from falling out of the stud 110. In addition, the isolation block 220 can limit the position of the explosive 4. By keeping the isolation block 220 in a stable position, the position of the internal explosive 4 can be kept stable, thus improving the reliability of use.

[0073] Based on the above embodiments, see Figure 7The limiting protrusion 112 is annular, and a first limiting slope 1121 is formed on the side facing the head 120. The first limiting slope 1121 gradually slopes inward in the direction away from the head 120. A second limiting slope 221 is formed on the outer periphery of one end of the isolation block 220. The second limiting slope 221 fits against the first limiting slope 1121 to limit the displacement of the isolation block 220 in the direction away from the head 120. The fitting of the second limiting slope 221 with the first limiting slope 1121 achieves axial limiting of the stud 110. The end face of the isolation block 220 can be set to be flush with the open end face of the stud 110 (e.g., ...). Figure 7 As shown in the figure, this design helps to improve the axial structural compactness of the power battery mounting bolts and shortens the length of the ignition lead electrode 210, reducing its material usage. In addition, the annular design can improve the structural uniformity of the limiting protrusion 112 and the isolation block 220, facilitating manufacturing and installation, and ensuring uniform stress distribution between the two.

[0074] In some embodiments, see Figure 6 The ignition lead electrode 210 has a hot wire mounting hole 211 at one end that extends into the filling chamber 3. The opening direction of the hot wire mounting hole 211 is set at an angle to the long axis of the ignition lead electrode 210. The end of the heating wire 230 is inserted and fixed in the hot wire mounting hole 211. By using the insertion assembly method, the assembly reliability of the heating wire 230 and the ignition lead electrode 210 is improved, and the heating wire 230 is prevented from falling off.

[0075] Optionally, after the heating wire 230 is inserted into the heating wire mounting hole 211, the protruding end is bent to form a hook to prevent the heating wire 230 from sliding out of the heating wire mounting hole 211. Preferably, the hook is further bent and fitted to the outer peripheral surface of the ignition lead electrode 210, which restricts the rotation of the heating wire 230 in the circumferential direction of the heating wire mounting hole 211, thereby improving the positional stability of the heating wire 230.

[0076] Optionally, the cross-section of the ignition lead electrode 210 is circular (e.g., Figure 2 As shown in the figure, the cross-section of the ignition lead electrode 210 may be rectangular, triangular or other shapes, whichever is convenient for manufacturing and assembly, and no single limitation is made here.

[0077] In some embodiments, the heating wire 230 is wavy (e.g., Figure 6 (As shown) or serrated, this structure allows the resistance band to have a certain degree of elasticity in the length direction, which can better adapt to the thermal expansion and contraction caused by temperature changes, and has greater flexibility in dealing with temperature changes, thereby improving the structural stability of the heating wire 230.

[0078] Based on the same inventive concept, this application also provides a power battery assembly, see reference. Figure 8 and Figure 9The power battery assembly includes a power battery body 15, a controller 7, a battery status sensor, and multiple power battery mounting bolts. The multiple power battery mounting bolts are distributed circumferentially along the power battery body 15 and can connect the power battery body 15 to the vehicle body 12. The controller 7 is electrically connected to the ignition lead electrode 210 in the power battery mounting bolts and the power battery body 15. The battery status sensor is disposed inside the power battery body 15 to sense the internal operating status of the power battery body 15, and the battery status sensor is electrically connected to the controller 7.

[0079] In this embodiment, the battery 8 inside the vehicle is electrically connected to the controller 7 via a power supply harness 11 to power the controller 7; alternatively, a separate battery 8, independent of the vehicle body 12, is provided, and the two are electrically connected via a power supply harness 11 to power the controller 7. The battery status sensor is electrically connected to the controller 7 via a sensing harness 10 to transmit the status data within the power battery body 15 to the controller 7.

[0080] Optionally, both the battery 8 and the controller 7 are fixedly installed inside the vehicle body 12 and do not detach with the power battery body 15; or, the battery 8 is fixed inside the vehicle body 12, and the controller 7 is fixed on the power battery body 15. The controller 7 detaches with the power battery body 15 and disconnects the power supply harness 11.

[0081] In this embodiment, the implementation of the battery status sensor is illustrated as follows: 1) The battery status sensor is a temperature sensor, which is used to sense the internal temperature of the power battery body 15. The temperature sensor feeds back the temperature value to the controller 7. If the internal temperature of the power battery body 15 reaches the ignition temperature threshold, it is determined that the power battery body 15 is on fire. The controller 7 controls the ignition device 2 to be turned on. The ignition part 201 of the ignition device 2 ignites the explosive 4. The impact force of the explosive 4 is conducted in the filling chamber 3. The weakening groove 5 breaks first. The breakage of the stud 110 causes the connection of the bolt body 1 to fail, and the power battery can fall off the vehicle body 12. 2) The battery status sensor is a smoke sensor, which is used to sense whether there is smoke inside the power battery body 15. If smoke is detected inside the power battery body 15, it is determined that the power battery body 15 is on fire. The controller 7 controls the ignition device 2 to be turned on. The subsequent process is similar to scenario 1), and will not be described again here. 3) The battery status sensors include temperature sensors and smoke sensors. If the internal temperature of the power battery body 15 reaches the fire temperature threshold and smoke is detected inside the power battery body 15, it is determined that the power battery body 15 is on fire. The subsequent control process is similar to that in scenario 1), and will not be described again here.

[0082] Optionally, each ignition device 2 is connected to the controller 7 via a different control harness 14, forming a parallel connection between the ignition devices 2. The controller 7 can simultaneously control the activation of each ignition device 2, making the self-destruction operations of the power battery mounting bolts more synchronized. This allows the power battery body 15 to fall in a near-horizontal position, avoiding excessive time differences in the detachment time of different parts of the power battery body 15, which could cause the edge of the power battery body 15 to get stuck on the vehicle body 12, or the power battery body 15 to continue following the vehicle body 12 while dragging on the ground, leading to more serious safety accidents. If the controller 7 is fixed to the vehicle body 12, the detachment of the power battery body 15 will break the control harness 14 and the sensing harness 10.

[0083] Compared with the prior art, the power battery mounting bolt provided in this application, based on the aforementioned power battery mounting bolt, uses a battery status sensor to sense the internal operating state of the power battery body 15. If a fire is detected in the power battery, the controller 7 controls the ignition device 2 to start. The ignition part 201 of the ignition device 2 ignites the explosive 4. After the explosive 4 explodes, the weakening groove 5 breaks first, and the head 120 separates from the stud 110. The bolt body 1 connection fails, and the power battery body 15 can detach from the vehicle body 12 and fall to the ground. During the fall of the power battery body 15, the battery wiring harness 9 breaks, and the power battery body 15 is completely separated from the vehicle body 12. The power battery assembly of this application can not only effectively protect the occupants of the vehicle, but also minimize the damage to the vehicle body 12, taking into account both safety and the need to reduce the loss to the owner.

[0084] In addition, after the main body of the power battery 15 is detached from the body 12, the battery 8 inside the body 12 can supply power to the power system inside the body 12, allowing the body 12 to continue to travel a certain distance. The driver can then control the vehicle to steer and brake, thereby moving away from the main body of the power battery 15 and further avoiding damage to the body 12 caused by a fire in the main body of the power battery 15.

[0085] In some embodiments, see Figures 9 to 11 The edge of the power battery body 15 extends outward to form a connecting edge 1510. The connecting edge 1510 has a mounting hole. During installation, the stud 110 passes through the mounting hole from bottom to top and connects to the vehicle body 12. The head 120 is located on the lower side of the connecting edge 1510, and a gasket 16 is provided between the head 120 and the connecting edge 1510.

[0086] Optionally, the connecting edge 1510 has a hollow structure, and a connecting sleeve 1520 is fixedly inserted through the connecting edge 1510. The connecting sleeve 1520 forms a mounting hole, and a stud 110 is installed through the connecting sleeve 1520, with the upper end of the stud 110 extending out of the connecting sleeve 1520. The upper part of the connecting sleeve 1520 protrudes from the upper side of the connecting edge 1510 and forms a limiting pad 1530. The limiting pad 1530 can contact the vehicle body 12 to limit the distance between the connecting edge 1510 and the vehicle body 12. More specifically, the lower end of the connecting sleeve 1520 abuts against the bottom wall of the inner cavity of the connecting edge 1510. The outer diameter of the limiting pad 1530 is larger than the outer diameter of the main body of the connecting sleeve 1520. After assembly, the connecting sleeve 1520 is squeezed by the vehicle body 12, and its force is distributed to the top wall of the connecting edge 1510 through the limiting pad 1530. Since the connecting edge 1510 is a hollow structure, the connecting edge 1510 itself can form a force transmission path and can transmit the force to the main body of the power battery 15. At the same time, the connecting sleeve 1520 can form support on the upper and lower sides of the connecting edge 1510 to prevent the connecting edge 1510 from deforming.

[0087] In specific implementation, the stud 110 is connected to the body 12 by welding a nut seat 13 onto the body 12, and the stud 110 is screwed to the nut seat 13, thereby achieving the connection between the stud 110 and the body 12.

[0088] Based on the same inventive concept, this application also provides a vehicle including the aforementioned power battery assembly.

[0089] Compared with the prior art, the power battery mounting bolts provided in this application, by adopting the aforementioned power battery assembly, can not only effectively protect the occupants of the vehicle, but also minimize the damage to the vehicle body 12, taking into account both safety and reducing the owner's losses, which is conducive to improving the vehicle's competitiveness.

[0090] 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 power battery mounting bolt, characterized in that, include: The bolt body (1) has a stud (110) and a head (120) connected to each other. The stud (110) is a hollow component, and its inner cavity forms an outlet opening (111) at one end away from the head (120). The ignition device (2) has an isolation block (220) and an ignition lead-out electrode (210). The isolation block (220) is inserted into the inner cavity of the stud (110) and blocks the lead-out opening (111) so that a filling chamber (3) is formed between the isolation block (220) and the closed end of the inner cavity of the stud (110). The filling chamber (3) is filled with explosive (4). The ignition lead-out electrode (210) is set through the isolation block (220), with one end extending out of the lead-out opening (111) and the other end extending into the filling chamber (3) to form an ignition part (201). The filling chamber (3) is provided with a weakening groove (5), and the opening direction of the weakening groove (5) is set at an angle to the long axis direction of the stud (110).

2. The power battery mounting bolt as described in claim 1, characterized in that, The weakening groove (5) has a first sidewall (510) and a second sidewall (520) distributed along the length direction of the stud (110). In the opening direction of the weakening groove (5), the distance between the first sidewall (510) and the second sidewall (520) gradually increases so that the cross-section of the weakening groove (5) is V-shaped.

3. The power battery mounting bolt as described in claim 2, characterized in that, Both the first sidewall (510) and the second sidewall (520) are straight sidewalls, and the opening direction of the weakening groove (5) is perpendicular to the length direction of the stud (110).

4. The power battery mounting bolt as described in claim 1, characterized in that, The weakening groove (5) is located near the head (120).

5. The power battery mounting bolt as described in claim 1, characterized in that, The ignition lead-out electrode (210) is provided in two sets. The ignition device (2) also includes a heating wire (230). The heating wire (230) is located in the filling chamber (3) and its two ends are respectively connected to the two sets of the ignition lead-out electrode (210). The heating wire (230) is the ignition part (201).

6. The power battery mounting bolt as described in claim 5, characterized in that, The inner side of the outlet opening (111) is provided with a limiting protrusion (112), which contacts the end of the isolation block (220) to limit the displacement of the isolation block (220) in a direction away from the head (120).

7. The power battery mounting bolt as described in claim 6, characterized in that, The limiting protrusion (112) is annular, and a first limiting slope (1121) is formed on the side facing the head (120). In the direction away from the head (120), the first limiting slope (1121) gradually slopes inward. A second limiting slope (221) is formed on the outer periphery of one end of the isolation block (220). The second limiting slope (221) fits against the first limiting slope (1121) to limit the displacement of the isolation block (220) in the direction away from the head (120).

8. The power battery mounting bolt as described in claim 5, characterized in that, The ignition lead electrode (210) has a hot wire assembly hole (211) at one end that extends into the filling chamber (3). The opening direction of the hot wire assembly hole (211) is set at an angle to the long axis of the ignition lead electrode (210). The end of the heating wire (230) is inserted and fixed in the hot wire assembly hole (211).

9. A power battery assembly, characterized in that, Includes a power battery body (15), a controller (7), a battery status sensor, and a plurality of power battery mounting bolts as described in any one of claims 1-8; Multiple power battery mounting bolts are distributed circumferentially along the power battery body (15) and can connect the power battery body (15) to the vehicle body (12); The controller (7) is electrically connected to the ignition lead-out electrode (210) in the power battery mounting bolt and the power battery body (15), respectively; The battery status sensor is installed inside the power battery body (15) to sense the internal operating status of the power battery body (15), and the battery status sensor is electrically connected to the controller (7).

10. A vehicle, characterized in that, Includes the power battery assembly as described in claim 9.

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