Electric vehicle battery replacement locking mechanism

Abstract

The utility model provides an electric vehicle battery replacement locking mechanism, wherein the lock body bolt comprises an upper lock body bolt and a lower lock body bolt which are mutually inserted and matched in the axial direction and circumferentially limited, the lower end of the lower lock body bolt extends out of the nut hole of the lock body nut, the middle of the lower lock body bolt is provided with an outwardly protruding lower bolt convex ring, the inner wall at the corresponding position of the lock body nut is provided with a step wall surface which is matched with the side wall of the lower bolt convex ring in the circumferential limit, and a compression spring is sleeved on the lower lock body bolt. The utility model prevents the lock body bolt from loosening and failing through the circumferential limit of the lower bolt convex ring and the lock body nut, and the disassembly and assembly process is simple and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of battery replacement for new energy vehicles, and in particular to a battery replacement locking mechanism for an electric vehicle. Background Art

[0002] Energy supply is an important link in the electric vehicle industry chain. At present, the energy supply of electric vehicles can be divided into two modes: plug-in charging and battery replacement. Since the charging time required for the plug-in charging mode is too long and fast charging also causes great damage to the battery, the battery replacement mode has gradually become a competitive commercial technology model. The battery replacement mode requires the original empty battery of the car to be removed and a fully charged battery to be installed. At present, the battery pack in the battery replacement mechanism is mainly connected to the chassis of the car through fastening bolts. The technical solution disclosed in the patent entitled "Battery Pack Battery Replacement Locking Device" (CN116315400A) includes a cover 4, a locking member 5, a locking spring 6, a card plate 7, a sealing plate 8 and a sealing anti-loosening plate 10. When locking, the servo gun sleeve 13 passes through the through hole of the cover 4 and pushes the card plate 7 to move upward, and then the servo gun sleeve 13 is rotated to tighten the locking member 5. In the above scheme, the card plate 7 is prone to deformation during the continuous locking or unlocking of the battery pack, which affects the efficiency of disassembling and installing the battery, and the locking member 5 also has the risk of loosening during the long-term driving of the car. Utility Model Content

[0003] The utility model aims to provide a battery replacement locking mechanism for an electric vehicle, which improves the efficiency of disassembling and assembling a battery pack and avoids the risk of loosening and failure of the lock body bolts.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the lock body bolt includes an upper lock body bolt and a lower lock body bolt which are inserted and matched with each other in the axial direction, the insertion and sleeve sections of the upper lock body bolt and the lower lock body bolt are matched in the circumferential upper limit direction, the upper part of the upper lock body bolt is threadedly connected with the screw hole of the vehicle body chassis, the lower part of the upper lock body bolt is rotatably connected with the side beam of the battery box body, the lock body bolt is inserted into the lock body nut, the lock body nut is fixedly connected with the upper lock body bolt, and the lower end of the lower lock body bolt extends out of the nut hole of the lock body nut A radially protruding lower bolt convex ring is provided in the middle of the lower bolt of the lock body, and a step wall surface that cooperates with the circumferential limit of the side wall of the lower bolt convex ring is provided on the inner wall at the corresponding position of the lock body nut, and the lower bottom surface of the lower bolt convex ring abuts against the end surface of the nut hole of the lock body nut, and the axial stroke of the lower bolt of the lock body and the upper bolt sleeve of the lock body is greater than the height of the step wall surface in the lock body nut, and a compression spring is also sleeved on the lower bolt of the lock body, which provides elastic force to drive the upper bolt and the lower bolt of the lock body to move away from each other in the axial direction.

[0005] The utility model mainly splits the lock body bolt into an upper lock body bolt and a lower lock body bolt that are mutually inserted and fitted and circumferentially limited, and a lower bolt convex ring is arranged in the middle of the lower lock body bolt to cooperate with the step wall surface in the lock body nut to form a circumferential limit. A compression spring is sleeved on the lower lock body bolt, and the lower part of the upper lock body bolt is rotatably connected to the side beam of the battery box. The lock body nut can limit the rotation of the lower lock body bolt through the wall surface of the step inside it, and the lower lock body bolt and the upper lock body bolt are circumferentially limited, so the lock body nut can prevent the entire lock body bolt from loosening. When disassembling and assembling the battery pack, the servo end sleeve is placed on the lower end of the lower lock body bolt and the lower lock body bolt is pushed upward, so that the lower bolt convex ring can be separated from the limiting step wall surface in the lock body nut, and then the lock body bolt can be disassembled or locked. The disassembly and assembly process is simple and reliable, and it can prevent the lock body bolt from loosening and failing. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 An isometric view of the battery-changing locking mechanism for an electric vehicle;

[0007] Figure 2 It is a cross-sectional view of a battery replacement locking mechanism of an electric vehicle;

[0008] Figure 3 This is an explosion diagram of the battery replacement locking mechanism of an electric vehicle;

[0009] Figure 4 A cross-sectional view of the lock body nut. DETAILED DESCRIPTION

[0010] See also Figures 1 to 4 The electric vehicle battery replacement locking mechanism shown in the figure, the lock body bolt 3 includes a lock body upper bolt 10 and a lock body lower bolt 20 that are inserted and matched with each other in the axial direction, the insertion and sleeve sections of the lock body upper bolt 10 and the lock body lower bolt 20 are matched in the circumferential upper limit position, the upper part of the lock body upper bolt 10 is threadedly connected to the screw hole of the vehicle body chassis 1, the lower part of the lock body upper bolt 10 is rotatably connected to the battery box side beam 2, the lock body bolt 3 is inserted into the lock body nut 30, the lock body nut 30 is fixedly connected to the lock body upper bolt 10, the lower end of the lock body lower bolt 20 extends out of the nut hole of the lock body nut 30, the lock body lower bolt 20 A radially protruding lower bolt convex ring 21 is provided in the middle part, and a step wall surface that cooperates with the circumferential limit of the side wall of the lower bolt convex ring 21 is provided on the inner wall at the corresponding position of the lock body nut 30, and the lower bottom surface of the lower bolt convex ring 21 abuts against the nut hole end surface 31 of the lock body nut 30. The axial stroke H of the lock body lower bolt 20 and the lock body upper bolt 10 sleeve is greater than the step wall surface height h in the lock body nut 30. A compression spring 40 is also sleeved on the lock body lower bolt 20. The compression spring 40 provides elastic force to drive the lock body upper bolt 10 and the lock body lower bolt 20 to move away from each other in the axial direction.

[0011] In the above scheme, the upper bolt 10 of the lock body and the lower bolt 20 of the lock body are matched with each other by inserting and sleeve, and the specific matching method is that an axially extending polygonal hole is set at the bottom end of the upper bolt 10 of the lock body, and a rod section matching with the above polygonal hole is set at the upper part of the lower bolt 20 of the lock body, and the matching constitutes a circumferential limit. The lock body nut 30 is located below the battery box side beam 2, and its upper end face is in contact with the bottom face of the battery box side beam 2. Under normal conditions, the lower bolt convex ring 21 of the lower bolt 20 of the lock body is pressed against the inner end face of the lock body nut 30 by the compression spring 40, and the lock body nut 30 can limit the rotation of the lower bolt 20 of the lock body through the step wall inside it, and the lower bolt 20 of the lock body is circumferentially limited with the upper bolt 10 of the lock body, so the lock body nut 30 can prevent the entire lock body bolt 3 from loosening. When the vehicle enters the battery swap station for battery swapping, the staff puts the servo-end sleeve on the lower end of the lower bolt 20 of the lock body and pushes the lower bolt 20 of the lock body upward, wherein the axial stroke H of the lower bolt 20 of the lock body and the plug-in sleeve of the upper bolt 10 of the lock body is greater than the height h of the step wall in the lock body nut 30, so that the lower bolt convex ring 21 can be separated from the circumferential limit constraint of the limit step wall in the lock body nut 30, and then the lock body bolt 3 is rotated to remove or lock the battery pack from the vehicle chassis 1. The disassembly and assembly process is simple and reliable.

[0012] In order to facilitate the installation of the battery box side beam 2, a transition sleeve 50 is arranged between the mounting hole of the battery box side beam 2 and the lock body bolt 3. The upper end periphery of the transition sleeve 50 has a radially protruding convex ring 51, and the lower end surface of the convex ring 51 is attached to the upper hole edge of the mounting hole of the battery box side beam 2. The sleeve section of the transition sleeve 50 below the convex ring 51 is inserted into the mounting hole of the battery box side beam 2. The thread on the inner wall surface of the transition sleeve 50 is matched and connected with the bolt 10 on the lock body. The transition sleeve 50 is threadedly connected to the lock body nut 30, and the upper end of the compression spring 40 is abutted against the lower end surface of the sleeve of the transition sleeve 50.

[0013] In the above scheme, the sleeve section of the transition sleeve 50 is inserted into the mounting hole of the battery box side beam 2 to form a rotation connection, the upper end surface of the convex ring 51 is in contact with the lower bottom surface of the vehicle chassis 1, and the upper end of the lock body nut 30 is provided with a flange and pressed against the bottom surface of the battery box side beam 2. When assembling the lock body, firstly thread the lock body bolt 3 and the transition sleeve 50, then insert the transition sleeve 50 together with the lock body bolt 3 into the mounting hole of the battery box side beam 2, and finally install the lock body nut 30 from the bottom of the battery box side beam 2. The basic premise for installing the lock body nut 30 is to tighten the thread between the lock body bolt 3 and the transition sleeve 50.

[0014] Preferably, the thread of the inner wall of the lock body nut 30 is opposite to the thread of the lock body upper bolt 10. The transition sleeve 50, the lock body upper bolt 10 and the lock body lower bolt 20 rotate synchronously, and the rotation direction of the lock body bolt 3 when loosened is opposite to the rotation direction of the lock body nut 30 when loosened, which has the effect of preventing loosening.

[0015] A more specific solution is that the cross-section of the sleeve section between the upper bolt 10 of the lock body and the lower bolt 20 of the lock body and / or the lower bolt convex ring 21 is a polygon, preferably a regular hexagon, to facilitate the circumferential limit fit between the sleeve section of the upper bolt 10 of the lock body and the lower bolt 20 of the lock body, and between the lower bolt convex ring 21 and the step wall surface of the lock body nut 30.

[0016] In order to facilitate the installation between the lock body bolt 3 and the vehicle body chassis 1, a concave step hole is provided on the upper part of the plate body of the vehicle body chassis 1 corresponding to the mounting hole of the lock body bolt 3, and a pressure plate 61 connected to the vehicle body chassis 1 with bolts is provided above the step hole. A convex ring 62 with a shape matching the step hole extends downward from the lower plate surface of the pressure plate 61, and a through hole for the lock body bolt 3 to pass through is preset in the middle part of the pressure plate 61. A floating nut 60 threadedly connected to the bolt 10 on the lock body is arranged in the cavity surrounded by the lower plate surface of the pressure plate 61, the inner ring surface of the convex ring 62 and the step hole of the vehicle body chassis 1, and the upper and lower end surfaces of the floating nut 60 are respectively abutted against the pressure plate 61 and the step hole of the vehicle body chassis 1, and a gap is left between the circumferential side wall of the floating nut 60 and the inner ring surface of the convex ring 62, and the aperture of the threaded hole of the floating nut 60 is smaller than the aperture of the mounting hole of the vehicle body chassis 1 and the through hole of the pressure plate 61.

[0017] When installing the battery pack, even if there is a small deviation between the axis of the bolt 10 on the lock body and the axis of the mounting hole of the vehicle chassis 1, the bolt 10 on the lock body can still be smoothly inserted into the threaded hole of the floating nut 60 by relying on the chamfer at its top, and the chamfer of the bolt 10 on the lock body drives the floating nut 60 to make a small horizontal displacement in the cavity between the pressure plate 61 and the step hole of the vehicle chassis 1, so that the axis of the bolt 10 on the lock body is aligned with the axis of the floating nut 60, which facilitates the installation of the lock body bolt 3.

Claims

1. An electric vehicle battery replacement locking mechanism, characterized in that: The lock body bolt (3) comprises an upper lock body bolt (10) and a lower lock body bolt (20) which are inserted and matched with each other in the axial direction. The insertion and sleeve sections of the upper lock body bolt (10) and the lower lock body bolt (20) are matched in the circumferential upper limit position. The upper part of the upper lock body bolt (10) is threadedly connected to the screw hole of the vehicle chassis (1). The lower part of the upper lock body bolt (10) is rotatably connected to the battery box side beam (2). The lock body bolt (3) is inserted into the lock body nut (30). The lock body nut (30) is fixedly connected to the upper lock body bolt (10). The lower end of the lower lock body bolt (20) protrudes from the nut hole of the lock body nut (30). The middle part of the lower lock body bolt (20) is provided with a radial The protruding lower bolt convex ring (21) and the inner wall at the corresponding position of the lock body nut (30) are provided with a step wall surface that cooperates with the side wall of the lower bolt convex ring (21) in a circumferential limiting manner. The lower bottom surface of the lower bolt convex ring (21) abuts against the nut hole end surface (31) of the lock body nut (30). The axial stroke (H) of the lock body lower bolt (20) and the lock body upper bolt (10) is greater than the height (h) of the step wall surface in the lock body nut (30). The lock body lower bolt (20) is also sleeved with a compression spring (40). The compression spring (40) provides elastic force to drive the lock body upper bolt (10) and the lock body lower bolt (20) to move away from each other in the axial direction.

2. The electric vehicle battery replacement locking mechanism according to claim 1, characterized in that: A transition sleeve (50) is arranged between the mounting hole of the battery box side beam (2) and the lock body bolt (3), and a radially protruding convex ring (51) is provided on the outer periphery of the upper end of the transition sleeve (50). The lower end surface of the convex ring (51) is placed on the upper hole edge of the mounting hole of the battery box side beam (2), and the sleeve section of the transition sleeve (50) below the convex ring (51) is inserted into the mounting hole of the battery box side beam (2). The threads on the inner wall surface of the transition sleeve (50) are matched and connected with the bolt (10) on the lock body, and the transition sleeve (50) is threadedly connected with the lock body nut (30), and the upper end of the compression spring (40) is in contact with the lower end surface of the sleeve of the transition sleeve (50).

3. The electric vehicle battery replacement locking mechanism according to claim 2 is characterized in that: The thread of the inner wall surface of the lock body nut (30) is in the opposite direction to the thread of the bolt (10) on the lock body.

4. The electric vehicle battery replacement locking mechanism according to claim 1, 2 or 3, characterized in that: The cross section of the inserting sleeve section between the upper bolt (10) of the lock body and the lower bolt (20) of the lock body and / or the lower bolt convex ring (21) is polygonal.

5. The electric vehicle battery replacement locking mechanism according to claim 2 or 3, characterized in that: The upper ends of the lock body nut (30) and / or the transition sleeve (50) are provided with flanges.

6. The electric vehicle battery replacement locking mechanism according to claim 1, characterized in that: The upper part of the plate body of the vehicle chassis (1) corresponding to the installation hole of the lock body bolt (3) is provided with an inwardly concave step hole, and a pressure plate (61) connected with the vehicle chassis (1) by bolts is provided above the step hole, and a convex ring (62) with a shape matching the step hole extends downward from the lower plate surface of the pressure plate (61), and a through hole for the lock body bolt (3) to pass through is preset in the middle of the pressure plate (61), and the lower plate surface of the pressure plate (61), the inner ring surface of the convex ring (62) and the vehicle chassis (1) are connected to each other. A floating nut (60) threadedly connected to the bolt (10) on the lock body is arranged in the cavity surrounded by the step hole, and the upper and lower end faces of the floating nut (60) are respectively abutted against the pressure plate (61) and the step hole of the vehicle chassis (1), and a gap is left between the peripheral side wall of the floating nut (60) and the inner ring surface of the convex ring (62), and the aperture of the threaded hole of the floating nut (60) is smaller than the aperture of the mounting hole of the vehicle chassis (1) and the through hole of the pressure plate (61).

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