Battery pack electromagnetic lifting lug, battery pack and new energy vehicle

Abstract

The battery pack electromagnetic lifting lug comprises a protection tube, an electromagnet is arranged in the protection tube, and the top end of the protection tube is detachably connected with a connecting base; by the adoption of the electromagnetic lifting lug for the battery pack, the battery replacing speed of the battery pack is increased, and the battery pack can be rapidly detached from a vehicle body.

Description

Technical Field

[0001] This invention belongs to the field of new energy batteries, specifically, this invention relates to an electromagnetic lifting lug for a battery pack. Background Technology

[0002] After a long period of research, the charging technology for electric vehicle batteries has reached a bottleneck. Compared to the less than 5 minutes it takes to refuel a gasoline car, the charging time is significantly longer, even fast charging takes at least 30 minutes.

[0003] Conventional technologies often use traditional mechanical designs for battery pack lifting lugs, securing the battery pack to the vehicle frame with bolts and nuts. This makes disassembling the battery pack extremely difficult and limits the development of battery swapping technology.

[0004] Utility model patent CN 219860181U, published on October 20, 2023, discloses a battery pack hoisting mechanism. This mechanism includes a lifting lug and a main body. The lower part of the lifting lug has a key. The main body is a hollow column with an end cap at the top and a plug at the bottom. The end cap has a key slot, which is a through slot allowing the key to pass through. The inner side of the end cap has a positioning part that intersects with the key slot, serving as a waist-shaped key mounting position. However, this battery pack hoisting mechanism does not completely solve the aforementioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an electromagnetic lifting lug for battery packs that improves battery pack swapping speed and enables rapid removal of battery packs from the vehicle body.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The battery pack electromagnetic lifting lug includes a protective tube, an electromagnet is installed inside the protective tube, and a connecting seat is detachably connected to the top of the protective tube; the electromagnet is detachably connected to the connecting seat.

[0007] The protective tube is an aluminum alloy tube, and the connecting seat is a steel connecting seat; the electromagnet includes an iron core, a coil and a terminal, the coil is wound on the iron core, the top and bottom of the cylinder are provided with limiting flanges, the coil is located between the two limiting flanges, and the end of the coil passes through the limiting flange and is connected to the terminal.

[0008] The bottom of the connector is provided with a first threaded hole and a second threaded hole, and the top of the protective tube is provided with a first external thread, which mates with the first threaded hole; the top of the iron core is provided with a second external thread, which mates with the second threaded hole.

[0009] The terminal includes a vertical terminal and a horizontal terminal, both of which extend out of the protective tube.

[0010] A frame support is provided above the connecting seat. The frame support includes a connecting seat and a truncated cone. A limiting groove is provided at the bottom of the truncated cone. The connecting seat and the connecting seat are fixed by adsorption. The top of the connecting seat is located in the limiting groove.

[0011] A sealing ring is provided between the connecting seat and the protective tube. A sealing groove is provided at the bottom of the connecting seat at the bottom of the first threaded hole, and the sealing ring is located in the sealing groove. An installation step is provided on the protective tube at the bottom of the first external thread, and the installation step abuts against the sealing ring.

[0012] The inner side of the protective tube is provided with an insulating coating.

[0013] The protective tube has an L-shaped structure, and a flange is provided at the end of the protective tube.

[0014] Battery pack, including the aforementioned battery pack electromagnetic lugs.

[0015] New energy vehicles, including the aforementioned battery packs.

[0016] The technical advantages of this invention are as follows: By using the electromagnetic lifting lug of the battery pack of this invention, a new solution is proposed that enables quick disassembly and replacement of the battery. By energizing the electromagnet inside the internal protective tube, the battery pack is attracted and fixed to the vehicle frame bracket. Compared with the traditional bolt connection method, this solves the problem of difficult battery pack disassembly and replacement. In the event of thermal runaway of the battery, the battery pack can be quickly separated from the vehicle body, thereby reducing economic losses. Attached Figure Description

[0017] This manual includes the following figures, which illustrate the following: Figure 1 This is an exploded view of the assembly of the electromagnetic lifting lugs for the battery pack of the present invention; Figure 2 This is a schematic diagram of the structure of the protective tube of the present invention; Figure 3 This is a schematic diagram of the electromagnet of the present invention; Figure 4 This is a schematic diagram of the structure of the connector of the present invention; Figure 5 This is a schematic diagram of the structure of the vehicle frame support of the present invention; The markings in the diagram are as follows: 1. Protective tube; 2. Connecting seat; 3. Electromagnet; 4. Iron core; 5. Coil; 6. Vertical terminal; 7. Horizontal terminal; 8. Limiting flange; 9. Flange; 10. Sealing ring; 11. First external thread; 12. Second external thread; 13. First threaded hole; 14. Second threaded hole; 15. Sealing groove; 16. Mounting step; 17. Connecting seat; 18. Frustum; 19. Limiting groove; 20. Lifting lug base. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0019] like Figure 1 As shown, the battery pack electromagnetic lifting lug includes a protective tube 1, an electromagnet 3 is installed inside the protective tube 1, and a connecting seat 2 is detachably connected to the top of the protective tube 1; the electromagnet 3 is detachably connected to it.

[0020] like Figures 1 to 4As shown, the protective tube 1 is an aluminum alloy tube, and the connecting seat 2 is a steel connecting seat. The electromagnet 3 includes an iron core 4, a coil 5, and terminals. The coil 5 is wound around the iron core 4. Limiting flanges 8 are provided at both the top and bottom of the tube. The coil 5 is located between the two limiting flanges 8, and the end of the coil 5 passes through the limiting flanges 8 and connects to the terminals. The electromagnet 3 consists of a copper coil 5, an iron core 4, and terminals. The wound copper coil 5 is a solenoid. Aluminum limiting flanges 8 are installed on both sides of the solenoid to prevent the wire harness from moving or falling off. The coil 5 is introduced and led out through the reserved holes on both sides of the flanges. When current flows through the solenoid, a magnetic field is generated. At the same time, the iron core 4 is magnetized by the magnetic field of the current, generating magnetism. The magnetism of the solenoid is greatly enhanced. When the current is disconnected, the magnetism disappears immediately. The iron core 4 is connected through a threaded steel connecting seat to fix the electromagnet 3. The steel connecting seat is made of high-strength steel. When an external DC power is applied, the coil 5 is energized and generates a magnetic field that magnetizes the connecting seat 2, allowing it to adhere to the steel frame bracket. The magnitude of the magnetic field is determined by the number of turns of coil 5 and the magnitude of the current flowing through it. Because steel is highly ferromagnetic, the steel connector connected to coil 5 is magnetized under the influence of the magnetic field, generating a strong magnetic force and maintaining its magnetism for a long time. The protective tube 1 is made of high-strength aluminum alloy, which has strong bending strength and is not magnetized by the magnetic field. In this embodiment, the outer diameter of the protective tube 1 is 77mm, and the inner diameter is 52mm. The nominal diameter of the threaded end is 72mm, and the pitch is 2mm. The length of the protective tube 1 is 80mm, and the thickness of the bottom flange of the protective tube 1 is 5mm, with a diameter of 107mm. In this embodiment, the steel connector is 50mm thick and has a diameter of 100mm. The connector 2 contains two layers of internal threads: the outer internal thread depth is 32mm, the nominal thread diameter is 72mm, and the pitch is 2mm; the inner internal thread depth is 12mm, the nominal thread diameter is 32mm, and the pitch is 1mm. In this embodiment, the coil 5 of the electromagnet 3 and the lead wires from the terminals are all made of copper wire with a diameter of 6 square millimeters, allowing a current of 30A to pass through. The iron core 4 is cylindrical with a diameter of 32mm and a length of 90mm. The nominal diameter of the threaded end is 32mm, and the pitch is 1mm. During the design, the magnetic force was adjusted to be suitable for supporting the weight of the battery pack, taking into account the magnitude of the magnetizing current, the number of turns of the coil 5, the number of lifting lugs, and the size of the iron core 4.

[0021] like Figure 4As shown, the bottom of the connector 2 is provided with a first threaded hole 13 and a second threaded hole 14. The top of the protective tube 1 is provided with a first external thread 11, which mates with the first threaded hole 13. The top of the iron core 4 is provided with a second external thread 12, which mates with the second threaded hole 14. Both the connector 2 and the electromagnet 3 are connected to the protective tube 1 via threaded connections, allowing the connector 2 to be detached from the protective tube 1. This enables the replacement of the coil 5, or the change of the number of turns of the coil 5 or the magnitude of the current, thus achieving different magnitudes of magnetic force output. The second threaded hole 14 is located in the middle of the first threaded hole 13. The two are nested and form a stepped structure, making full use of the space of the connector 2. At the same time, it realizes the detachable connection and overall installation of the electromagnet 3 and the protective tube 1, reducing the thickness of the connector 2, reducing the design difficulty of the hanger bracket on the vehicle frame, and allowing the above components to be pre-assembled before being connected to the battery pack box, thereby improving assembly efficiency.

[0022] like Figure 2 As shown, the terminals include a vertical terminal 6 and a horizontal terminal 7, both of which extend out of the protective tube 1. The two terminals are located at different positions and face different directions within the protective tube 1, which helps prevent contact between the connecting wires. These two terminals serve as power interfaces, allowing connection to a DC power source via lead-out wires. For example, they can be connected to a rectifier or a battery system from a household 220V power supply for direct power supply, facilitating use in various situations. If a high magnetic force is required, it is recommended to select a battery system with high current discharge capability.

[0023] like Figure 5 As shown, a frame bracket is provided above the connecting seat 2. The frame bracket includes a connecting seat 17 and a frustum 18. The bottom of the frustum 18 has a limiting groove 19. The connecting seat 2 and the connecting seat 17 are fixed by adsorption, and the top of the connecting seat 2 is located within the limiting groove 19. The frame bracket consists of the connecting seat 17 and the frustum 18. The connecting seat 17 is made of high-strength aluminum alloy, and the frustum 18 is made of high-strength steel. The connecting seat 17 is directly welded to the frame. The steel frustum 18 is welded below the connecting frustum 17. The bottom circular surface of the frustum 18 is grooved to form a limiting groove 19 that fits the top of the connecting seat 2, which is used to limit the planar movement of the battery pack. The steel connecting seats of the frame bracket and the battery pack lifting lugs are connected by magnetic adsorption. In this embodiment, the thickness of the connecting seat 17 is 20mm and the diameter is 70mm; the upper and lower base diameters of the frustum 18 are 70mm and 110mm respectively, and the height is 50mm; the groove diameter is 101mm and the depth is 10mm.

[0024] like Figure 1As shown, a sealing ring 10 is provided between the connecting seat 2 and the protective tube 1. A sealing groove 15 is provided at the bottom of the connecting seat 2 at the bottom of the first threaded hole 13, and the sealing ring 10 is located within the sealing groove 15. An installation step 16 is provided on the protective tube 1 at the bottom of the first external thread 11, and the installation step 16 abuts against the sealing ring 10. The sealing groove 15 reliably limits the sealing ring 10, ensuring it is embedded in the threaded opening of the connecting seat 2, preventing external liquids from seeping into the protective tube 1 and corroding the internal coil 5. The sealing ring 10 is made of SIL silicone rubber, which has excellent heat resistance, cold resistance, ozone resistance, and atmospheric aging resistance, as well as good insulation properties, with an operating temperature range of -55~250℃. In this embodiment, the sealing ring 10 has a thickness of 5mm, an outer radius of 77mm, and an inner radius of 72mm.

[0025] The inner side of the protective tube 1 is coated with an insulating layer. The inner layer of the protective tube 1 is coated with an insulating layer to prevent electrical leakage from the wires and thus prevent safety accidents.

[0026] like Figure 2 As shown, the protective tube 1 has an L-shaped structure, with a flange 9 at one end. The protective tube 1 is L-shaped, with one hole pre-drilled in both the vertical and horizontal directions for terminal installation. The vertical end of the tube 1 has external threads, and the horizontal end has the flange 9, whose two ends are used to connect to the connecting seat 2 and the battery pack housing, respectively. The flange 9 has threaded holes and is connected to the lifting lug base 20 on the housing via screws. The flange 9 is used to fix the lifting lug base 20 welded to the battery pack housing; their shapes are compatible, providing support for the protective tube 1. The lifting lug base 20 is made of the same high-strength aluminum alloy as the protective tube 1, which helps to reduce the influence of the magnetic field on the housing. In this embodiment, the lifting lug base 20 is in the shape of a connecting seat 2, with a thickness of 25mm and a diameter of 107mm. The base has threaded holes corresponding to those on the protective tube 1.

[0027] The battery pack includes the aforementioned electromagnetic lifting lugs. Multiple electromagnetic lifting lugs are installed on the battery pack. When an external power source energizes the coil 5, the energized coil 5 generates a magnetic force in the lifting lugs, causing the connecting seat 2 and the connecting seat 17 to be fixed by attraction. The battery pack is attracted to the vehicle frame bracket, and the vehicle frame bracket is simultaneously magnetized. When energized in the reverse direction, the magnetic poles of the connecting seat 2 reverse, repelling the magnetic force of the connecting seat 2 against the vehicle frame bracket, causing the battery pack to detach from the vehicle frame, thus achieving quick disassembly of the battery pack.

[0028] New energy vehicles, including the aforementioned battery packs.

[0029] In use, first use auxiliary equipment to support the battery pack, ensuring that the top of the steel connector aligns with the plane of the limiting groove 19 on the bottom surface of the frustum 18 of the frame bracket. Then, connect the DC power supply to energize the coil 5 inside the protection tube 1 for one minute, after which the battery pack hanger is magnetized. Under the influence of the battery pack hanger, the frame bracket generates opposite magnetic poles at the contact surface, causing the frame bracket and the battery pack hanger to attract each other. When the battery pack's power is depleted, simply reverse the power cord to weaken the magnetic field strength of the battery pack hanger, allowing the battery pack to automatically detach within one minute.

[0030] This electromagnetic lifting lug for battery packs is suitable for use in scenarios involving battery swapping in new energy vehicles or handling thermal runaway of battery packs, as detailed below: Regarding the battery pack swapping process: While battery swapping technology effectively addresses the slow charging time of new energy vehicles, achieving efficient battery swapping remains a significant technical challenge. The battery pack using electromagnetic mounting brackets allows for rapid replacement from the vehicle body. These brackets can be quickly magnetized and demagnetized, completing the entire swapping process in under 5 minutes, saving substantial time and costs.

[0031] In the event of battery pack thermal runaway: Traditional battery packs use bolts and nuts to secure the lifting lugs to the vehicle frame. When thermal runaway occurs, the battery pack cannot be quickly detached from the vehicle body, leading to the vehicle body burning out. Using electromagnetic lifting lugs, in the event of thermal runaway, coil 5 can be reversed and connected to the battery. This allows for rapid demagnetization of the lifting lugs, enabling quick detachment of the battery pack from the vehicle body, preventing vehicle body burnout and reducing economic losses.

[0032] This electromagnetic lifting lug for the battery pack offers a novel solution for quick battery removal and replacement. By energizing the electromagnet 3 inside the internal protection tube 1, the battery pack is magnetically attached to the vehicle frame bracket. Compared with the traditional bolt connection method, this solves the problem of difficult battery pack removal and replacement. Furthermore, in the event of thermal runaway, the battery pack can be quickly separated from the vehicle body, thereby reducing economic losses.

[0033] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A battery pack electromagnetic lifting lug, characterized in that: It includes a protective tube (1), an electromagnet (3) is provided inside the protective tube (1), and a connecting seat (2) is detachably connected to the top of the protective tube (1); the electromagnet (3) is detachably connected to it.

2. The battery pack electromagnetic lifting lug according to claim 1, characterized in that: The protective tube (1) is an aluminum alloy tube, and the connecting seat (2) is a steel connecting seat; the electromagnet (3) includes an iron core (4), a coil (5) and a terminal. The coil (5) is wound on the iron core (4). The top and bottom of the cylinder are provided with limiting flanges (8). The coil (5) is located between the two limiting flanges (8). The end of the coil (5) passes through the limiting flange (8) and is connected to the terminal.

3. The battery pack electromagnetic lifting lug according to claim 2, characterized in that: The bottom of the connecting seat (2) is provided with a first threaded hole (13) and a second threaded hole (14), and the top of the protective tube (1) is provided with a first external thread (11), which is engaged with the first threaded hole (13); the top of the iron core (4) is provided with a second external thread (12), which is engaged with the second threaded hole (14).

4. The battery pack electromagnetic lifting lug according to claim 3, characterized in that: The terminal includes a vertical terminal (6) and a horizontal terminal (7), both of which extend out of the protective tube (1).

5. The battery pack electromagnetic lifting lug according to any one of claims 2-4, characterized in that: The connecting seat (2) is provided with a frame bracket above it. The frame bracket includes a connecting seat (17) and a truncated cone (18). The bottom of the truncated cone (18) is provided with a limiting groove (19). The top of the connecting seat (2) is located in the limiting groove (19).

6. The battery pack electromagnetic lifting lug according to claim 3, characterized in that: A sealing ring (10) is provided between the connecting seat (2) and the protective tube (1). A sealing groove (15) is provided at the bottom of the first threaded hole (13) of the connecting seat (2). The sealing ring (10) is located in the sealing groove (15). An installation step (16) is provided at the bottom of the first external thread (11) on the protective tube (1). The installation step (16) abuts against the sealing ring (10).

7. The battery pack electromagnetic lifting lug according to claim 5, characterized in that: The inner side of the protective tube (1) is provided with an insulating coating.

8. The battery pack electromagnetic lifting lug according to claim 1, characterized in that: The protective tube (1) has an L-shaped structure, and a flange (9) is provided at the end of the protective tube (1).

9. A battery pack, characterized in that: Includes the battery pack electromagnetic lifting lugs as described in claims 1-8.

10. A new energy vehicle, characterized in that: Includes the battery pack as described in claim 9.

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