Battery module fastening device

Abstract

The utility model relates to the technical field of battery modules, and discloses a battery module fastening device, which comprises a first U-shaped piece, a second U-shaped piece, a third U-shaped piece, a third U-shaped piece, a fourth U-shaped piece and a fourth U-shaped piece, openings of the second U-shaped piece and the first U-shaped piece are oppositely arranged to form a battery module mounting position, the first U-shaped piece and the second U-shaped piece are in sliding connection through a connecting piece, the first U-shaped piece is suitable for sliding switching between an initial position and a fastening position, in the initial position state, the first U-shaped piece and the second U-shaped piece are far away from each other, and in the fastening position state, the first U-shaped piece and the second U-shaped piece are fastened. The first U-shaped piece and the second U-shaped piece are close to each other to clamp the battery module; the two transmission gears are rotationally connected to the connecting piece and are in transmission connection with the two first racks correspondingly so as to drive the first U-shaped piece and the second U-shaped piece to be switched between the initial position and the fastening position. The problems that battery modules of different sizes cannot be fastened, and the fastening effect is poor are solved or improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery modules, and in particular to a battery module fastening device. Background Art

[0002] During the battery module stacking process, due to the size deviation of the stacked materials, the conventional binding straps will have size deviations when tightening the battery module, and may be too long or too short. If they are too long, the pre-tightening force on the battery module is insufficient, and if they are too short, they cannot be put on.

[0003] The related technology is to set multiple buckles and hooks on the strap, and connect the hooks to the buckles to adjust the length of the strap. However, the connection is prone to deformation after long-term use, which reduces the fastening effect. Utility Model Content

[0004] In view of this, the present application provides a battery module fastening device to solve or improve the problem that battery modules of different sizes cannot be fastened and the fastening effect is poor.

[0005] The present application provides a battery module fastening device, comprising:

[0006] A first U-shaped member, wherein the ends of the first side plate and the second side plate are both provided with a first rack;

[0007] The second U-shaped member is arranged opposite to the opening of the first U-shaped member to form a battery module installation position. The first U-shaped member and the second U-shaped member are slidably connected by a connecting member. The first U-shaped member is suitable for sliding between an initial position and a fastened position. In the initial position, the first U-shaped member and the second U-shaped member are separated from each other. In the fastened position, the first U-shaped member and the second U-shaped member are close to each other to clamp the battery cell group located in the battery module installation position.

[0008] The two transmission gears are rotatably connected to the connecting member and are respectively transmission-connected to the two first racks to drive the first U-shaped member and the second U-shaped member to switch between the initial position and the fastening position.

[0009] Beneficial effect: the openings of the first U-shaped member and the second U-shaped member are arranged relative to each other to form a battery module installation position, the first U-shaped member and the second U-shaped member are slidably connected by a connecting member, the first U-shaped member and the second U-shaped member can approach or move away from each other, and in the initial position, the first U-shaped member and the second U-shaped member are far away from each other, which increases the battery module installation position and facilitates the installation of the battery module. When the battery module is installed, the transmission gear is rotated to drive the two first racks to move, thereby driving the first U-shaped member to move from the initial position to the fastening position, that is, to approach the second U-shaped member, clamping the battery module, and clamping the battery cell group located in the battery module installation position through the transmission method of the gear and the rack, which can fasten battery modules of different sizes and the fastening effect is more stable.

[0010] In an optional embodiment, the connecting member includes a first connecting plate and a second connecting plate, the first connecting plate is provided with a first connecting portion and a first sliding portion, the first connecting portion is connected to the first end plate of the second U-shaped member, and the first sliding portion is slidably connected to the first side plate of the first U-shaped member; the second connecting plate is provided with a second connecting portion and a second sliding portion, the second connecting portion is connected to the second end plate of the second U-shaped member, and the second sliding portion is slidably connected to the second side plate of the first U-shaped member, and the two transmission gears are respectively rotatably connected to the first connecting plate and the second connecting plate.

[0011] In an optional embodiment, the first sliding part and the second sliding part are respectively fixed with a first guide protrusion and a second guide protrusion, the first side plate and the second side plate of the first U-shaped part are respectively provided with a first guide hole and a second guide hole, and the first guide protrusion and the second guide protrusion are correspondingly slidably connected in the first guide hole and the second guide hole to enable the first U-shaped part to switch between the initial position and the fastened position.

[0012] In an optional embodiment, the first connecting portion and the second connecting portion are respectively fixed with a first guide block and a second guide block, the first end plate and the second end plate of the second U-shaped member are respectively provided with a first directional hole and a second directional hole, and the first guide block and the second guide block are correspondingly slidably connected in the first directional hole and the second directional hole.

[0013] In an optional embodiment, the ends of the first end plate and the second end plate of the second U-shaped member are both provided with second racks, and the two first racks and the two second racks are arranged in one-to-one correspondence, wherein a corresponding first rack and a corresponding second rack form a group and are connected by a transmission gear to drive the first rack and the second rack of the same group to move toward or away from each other.

[0014] In an optional embodiment, two gear driving members are further included, and the two gear driving members are respectively installed on the first connecting plate and the second connecting plate to drive the corresponding transmission gears to rotate.

[0015] In an optional embodiment, the gear drive member includes a drive plate, which has an oblong hole, and a first straight side wall and a second straight side wall are provided on both sides of the oblong hole. A third rack is fixed on the first straight side wall, and the oblong hole is sleeved on the transmission gear. The transmission gear is connected to the third rack for transmission, and the second straight side wall is in sliding contact with the transmission gear. The third rack drives the transmission gear to rotate so that the first U-shaped member switches between the initial position and the fastened position.

[0016] In an optional embodiment, the gear drive member also includes a limiting rod, which is perpendicular to the axial direction of the oblong hole and has multiple through holes on the side wall of the driving plate. The multiple through holes are arranged along the sliding direction of the third rack. When the first U-shaped member is in the fastening position, the limiting rod is passed through the through hole, and the limiting rod abuts against the transmission gear to lock the first U-shaped member in the fastening position.

[0017] In an optional embodiment, two insulating films and a plurality of mounting members are further included, and the two insulating films are connected to the first connecting plate and the second connecting plate through the plurality of mounting members.

[0018] In an optional embodiment, the mounting member includes two pulleys, a connecting shaft and a clamping member. The first connecting plate and the second connecting plate are both provided with mounting grooves, and the mounting grooves are arranged in the direction from the initial position to the fastening position. The two pulleys are rotatably connected to the two ends of the connecting shaft, and the clamping member is connected to the connecting shaft. The two pulleys are rollingly connected in the mounting groove and the clamping member passes through the notch of the mounting groove to clamp the insulating film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 This is a schematic structural diagram of a battery module fastening device according to an embodiment of the present application;

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram;

[0022] Figure 3 for Figure 1 A partial enlarged schematic diagram of B in the middle;

[0023] Figure 4 This is a schematic structural diagram of another battery module fastening device according to an embodiment of the present application;

[0024] Figure 5This is a schematic structural diagram of a mounting member in a battery module fastening device according to an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1. First U-shaped member; 101. First side plate; 102. Second side plate; 103. First guide hole; 2. Second U-shaped member; 201. First end plate; 202. Second end plate; 203. First directional hole; 3. First rack; 4. Battery module mounting position; 5. Connecting member; 51. First connecting plate; 511. First guide protrusion; 512. First guide block; 52. Second connecting plate; 6. Transmission gear; 7. Second rack; 8. Gear driving member; 81. Driving plate; 811. Oblong hole; 812. Third rack; 813. Through hole; 82. Limit rod; 9. Mounting member; 91. Pulley; 92. Connecting shaft; 93. Clamping member; 931. Clamping rod; 932. Clamping sheet; 10. Insulating film; 11. Mounting groove; 12. Connecting groove; 13. Partition. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0028] The following combination Figures 1 to 5 , describing the embodiments of the present application.

[0029] According to an embodiment of the present application, a battery module fastening device is provided, comprising:

[0030] The first U-shaped member 1 has a first rack 3 provided at the ends of the first side plate 101 and the second side plate 102;

[0031] The second U-shaped member 2 is arranged opposite to the opening of the first U-shaped member 1 to form a battery module mounting position 4. The first U-shaped member 1 and the second U-shaped member 2 are slidably connected by a connecting member 5. The first U-shaped member 1 is suitable for sliding between an initial position and a fastened position. In the initial position, the first U-shaped member 1 and the second U-shaped member 2 are separated. In the fastened position, the first U-shaped member 1 and the second U-shaped member 2 are close to each other to clamp the battery cell group located in the battery module mounting position 4.

[0032] The two transmission gears 6 are rotatably connected to the connecting member 5 and are respectively transmission-connected to the two first racks 3 to drive the first U-shaped member 1 and the second U-shaped member 2 to switch between the initial position and the fastened position.

[0033] The openings of the first U-shaped member 1 and the second U-shaped member 2 are arranged relative to each other to form a battery module mounting position 4. The first U-shaped member 1 and the second U-shaped member 2 are slidably connected by a connecting member 5. The first U-shaped member 1 and the second U-shaped member 2 can approach or move away from each other. In the initial position, the first U-shaped member 1 and the second U-shaped member 2 are far away from each other, which increases the battery module mounting position 4 and facilitates the installation of the battery module. When the battery module is installed, the transmission gear 6 is rotated to drive the two first racks 3 to move, thereby driving the first U-shaped member 1 to move from the initial position to the fastening position, that is, to approach the second U-shaped member 2, clamping the battery module, and clamping the battery cell group in the battery module mounting position 4 through the transmission method of the gear and rack. Battery modules of different sizes can be fastened and the fastening effect is more stable.

[0034] In some embodiments, the first U-shaped member 1 and the second U-shaped member 2 are both U-shaped plates.

[0035] In a specific embodiment, the first U-shaped member 1 and the two first racks 3 are integrally formed.

[0036] In one embodiment, the connecting member 5 includes a first connecting plate 51 and a second connecting plate 52, the first connecting plate 51 is provided with a first connecting portion and a first sliding portion, the first connecting portion is connected to the first end plate 201 of the second U-shaped member 2, and the first sliding portion is slidingly connected to the first side plate 101 of the first U-shaped member 1; the second connecting plate 52 is provided with a second connecting portion and a second sliding portion, the second connecting portion is connected to the second end plate 202 of the second U-shaped member 2, and the second sliding portion is slidingly connected to the second side plate 102 of the first U-shaped member 1, and the two transmission gears 6 are respectively rotatably connected to the first connecting plate 51 and the second connecting plate 52.

[0037] The first connecting portion of the first connecting plate 51 and the second connecting portion of the second connecting plate 52 are respectively connected to the first end plate 201 and the second end plate 202 of the second U-shaped plate, and the first sliding portion of the second connecting plate 52 and the second sliding portion of the second connecting plate 52 are respectively slidably connected to the first side plate 101 and the second side plate 102 of the first U-shaped part 1, so that the first U-shaped part 1 can be moved closer to or away from the second U-shaped part 2.

[0038] In some embodiments, the first connecting portion of the first connecting plate 51 and the second connecting portion of the second connecting plate 52 are fixedly connected to the first end plate 201 and the second end plate 202 of the second U-shaped plate, respectively, and the first sliding portion of the second connecting plate 52 and the second sliding portion of the second connecting plate 52 are slidingly connected to the first side plate 101 and the second side plate 102 of the first U-shaped member 1, respectively. The first U-shaped member 1 is connected to the first connecting plate 51 and the second connection by sliding to approach or move away from the second U-shaped member 2.

[0039] In one embodiment, the first sliding portion and the second sliding portion are respectively fixed with a first guide protrusion 511 and a second guide protrusion, and the first side plate 101 and the second side plate 102 of the first U-shaped member 1 are respectively provided with a first guide hole 103 and a second guide hole, and the first guide protrusion 511 and the second guide protrusion are correspondingly slidably connected in the first guide hole 103 and the second guide hole to enable the first U-shaped member 1 to switch between the initial position and the fastened position.

[0040] The first guide protrusion 511 and the second guide protrusion are respectively slidably connected in the first guide hole 103 and the second guide hole, so that the first U-shaped member 1 is slidably connected to the first connecting plate 51 and the second connecting plate 52, and the transmission gear 6 drives the first rack 3 to move, thereby driving the first U-shaped member 1 to switch between the initial position and the fastening position.

[0041] In some embodiments, the first guide protrusion 511 and the second guide protrusion are rectangular guide blocks, and the first guide hole 103 and the second guide hole are set as rectangular guide holes that match the first guide protrusion 511 and the second guide protrusion. The first guide protrusion 511 and the second guide protrusion can only slide in the first guide hole 103 and the second guide hole and cannot rotate.

[0042] In some embodiments, the structures of the first guide hole 103 and the second guide hole can be replaced by rectangular guide grooves, and the first guide protrusion 511 and the second guide protrusion are rectangular guide blocks, which are slidably connected in the rectangular guide grooves.

[0043] In one embodiment, the first connecting portion and the second connecting portion are respectively fixed with a first guide block 512 and a second guide block, and the first end plate 201 and the second end plate 202 of the second U-shaped member 2 are respectively provided with a first directional hole 203 and a second directional hole, and the first guide block 512 and the second guide block are correspondingly slidably connected in the first directional hole 203 and the second directional hole.

[0044] In some embodiments, the first guide block 512 and the second guide block are rectangular guide blocks, and the first directional hole 203 and the second directional hole are set as rectangular directional holes that match the first guide block 512 and the second guide block. The first guide block 512 and the second guide block can only slide in the first directional hole 203 and the second directional hole and cannot rotate.

[0045] In some embodiments, the structures of the first directional hole 203 and the second directional hole can be replaced by rectangular guide grooves, and the first guide block 512 and the second guide block are rectangular guide blocks, which are slidably connected in the rectangular guide grooves.

[0046] In one embodiment, the ends of the first end plate 201 and the second end plate 202 of the second U-shaped member 2 are both provided with second racks 7, and the two first racks 3 and the two second racks 7 are arranged in one-to-one correspondence, wherein a corresponding first rack 3 and a corresponding second rack 7 form a group and are connected by a transmission gear 6 to drive the first rack 3 and the second rack 7 of the same group to move toward or away from each other.

[0047] The first guide block 512 and the second guide block are respectively slidably connected to the first directional hole 203 and the second directional hole, so that the second U-shaped member 2 is slidably connected to the first connecting plate 51 and the second connecting plate 52. Under the action of the transmission gear 6 and the first rack 3 and the second rack 7, the first U-shaped member 1 and the second U-shaped member 2 are driven to move closer to or away from each other, thereby improving the tightening and release efficiency.

[0048] In a specific embodiment, the second U-shaped member 2 and the two second racks 7 are integrally formed.

[0049] In a specific embodiment, the first rack 3 is provided with a scale;

[0050] And / or, the second rack 7 is provided with a scale.

[0051] In one embodiment, two gear driving members 8 are further included. The two gear driving members 8 are respectively mounted on the first connecting plate 51 and the second connecting plate 52 to drive the corresponding transmission gear 6 to rotate.

[0052] In one embodiment, the gear drive member 8 includes a drive plate 81, which has an oblong hole 811. A first straight side wall and a second straight side wall are provided on both sides of the oblong hole 811. A third rack 812 is fixed on the first straight side wall. The oblong hole 811 is sleeved on the transmission gear 6. The transmission gear 6 is connected to the third rack 812 through transmission. The second straight side wall is in sliding contact with the transmission gear 6. The third rack 812 drives the transmission gear 6 to rotate so that the first U-shaped member 1 switches between the initial position and the fastened position.

[0053] The third rack 812 is in transmission connection with the transmission gear 6, which moves the driving plate 81 and drives the transmission gear 6 to rotate. The transmission gear 6 drives the corresponding first rack 3 and second rack 7 to move toward or away from each other, so that the first U-shaped member 1 switches between the initial position and the fastened position.

[0054] In a specific embodiment, two guide strips 14 are provided on the first connecting plate 51 and the second connecting plate 52. The two guide strips 14 form a guide channel. The driving plate 81 is slidably connected in the guide channel to prevent the driving plate 81 from rotating.

[0055] In one embodiment, the gear drive member 8 also includes a limiting rod 82, and a plurality of through holes 813 are opened on the side wall of the driving plate 81 perpendicular to the axial direction of the oblong hole 811. The plurality of through holes 813 are arranged along the sliding direction of the third rack 812. When the first U-shaped member 1 is in the fastening position, the limiting rod 82 is passed through the through hole 813, and the limiting rod 82 abuts against the transmission gear 6 to lock the first U-shaped member 1 in the fastening position.

[0056] Move the driving plate 81 so that the first U-shaped part 1 and the second U-shaped part 2 clamp the battery module, and pass the limiting rod 82 through the corresponding through hole 813 so that the part of the limiting rod 82 located inside the oblong hole 811 abuts against the transmission gear 6 to prevent relative movement between the driving plate 81 and the transmission gear 6, thereby ensuring that the first U-shaped part 1 and the second U-shaped part 2 clamp the battery module.

[0057] In some embodiments, Figure 2 Taking the perspective of as an example, the third rack 812 is arranged on the right inner wall of the oblong hole 811, and the driving plate 81 is moved downward. The third rack 812 drives the transmission gear 6 to rotate, and drives the first rack 3 and the second rack 7 to move toward each other. The first U-shaped part 1 and the second U-shaped part 2 clamp the battery module. At this time, under the reaction of the clamping force, the driving plate 81 has a tendency to move downward, and the limiting rod 82 is passed through the through hole. The part of the limiting rod 82 that is displaced inside the oblong hole 811 abuts against the transmission gear 6, preventing the driving plate 81 from moving downward, and locking the transmission gear 6.

[0058] It should be noted that the third rack 812 may also be provided on the left inner wall of the oblong hole 811 .

[0059] In one embodiment, two insulating films 10 and a plurality of mounting members 9 are further included. The two insulating films 10 are connected to the first connecting plate 51 and the second connecting plate 52 via the plurality of mounting members 9 .

[0060] The two insulating films 10 are connected to the ends of the first U-shaped member 1 and the second U-shaped member 2 respectively.

[0061] Specifically, the battery module includes a battery module fastening device, an end plate, and a cell group. The end plate includes a front plate and a rear plate, which are clamped at both ends of the cell group. Two insulating films 10 are located between the front plate and the cell group and between the rear plate and the cell group, respectively, to prevent short circuits between the cell group and components on the end plate. A first U-shaped member 1 and a second U-shaped member 2 clamp the front plate and the rear plate to the cell group.

[0062] Specifically, the first U-shaped member 1 and the second U-shaped member 2 may be made of steel or insulating material.

[0063] In one embodiment, Figure 3 and Figure 5As shown, the mounting member 9 includes two pulleys 91, a connecting shaft 92 and a clamping member 93. The first connecting plate 51 and the second connecting plate 52 are both provided with a mounting groove 11. The mounting groove 11 is arranged in the direction from the initial position to the fastening position. The two pulleys 91 are rotatably connected to the two ends of the connecting shaft 92. The clamping member 93 is connected to the connecting shaft 92. The two pulleys 91 are slidably connected in the mounting groove 11 and the clamping member 93 passes through the notch of the mounting groove 11 and clamps the insulating film 10.

[0064] The two pulleys 91 are slidably connected to the mounting groove 11 , and the clamping member 93 extends out of the notch of the mounting groove 11 and is connected to the insulating film 10 . The battery cell group is installed between the two insulating films 10 .

[0065] In some embodiments, as Figure 5 As shown, the clamping member 93 includes two clamping rods 931 and two clamping plates 932. One end of the two clamping rods 931 is fixed on the connecting shaft 92, and the other end extends out of the notch of the mounting groove 11 and is fixed with a clamping plate 932. The two clamping plates 932 are staggered to form a clamping gap for clamping the insulating film 10.

[0066] In some embodiments, as Figure 3 As shown, two connecting grooves 12 are opened on the first connecting plate 51 along the direction perpendicular to the mounting groove 11. One end of the two connecting grooves 12 is through-connected, and the other end is connected with the two ends of the mounting groove 11 respectively. The two pulleys 91 are inserted from the through ends of the connecting grooves 12 to facilitate the installation of the two pulleys 91 in the mounting groove 11. A partition 13 is provided in the connecting groove 12 to form two roller guide grooves. The two rollers are connected in a rolling manner in the two roller guide grooves for guiding the rollers.

[0067] In some embodiments, two connecting grooves 12 are opened on the second connecting plate 52 along the direction perpendicular to the mounting groove 11. One end of the two connecting grooves 12 is through-connected, and the other end is respectively connected to the two ends of the corresponding mounting groove 11. The two pulleys 91 are passed through the through ends of the connecting grooves 12 to facilitate the installation of the two pulleys 91 in the mounting groove 11.

[0068] In some embodiments, the connecting groove and the communicating groove 12 have the same structure.

[0069] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the accompanying application.

Claims

1. A battery module fastening device, characterized in that: include: A first U-shaped member (1), wherein the ends of the first side plate (101) and the second side plate (102) are both provided with a first rack (3); The second U-shaped member (2) is arranged opposite to the opening of the first U-shaped member (1) to form a battery module installation position (4); the first U-shaped member (1) and the second U-shaped member (2) are slidably connected via a connecting member (5); the first U-shaped member (1) is suitable for sliding and switching between an initial position and a fastened position; in the initial position, the first U-shaped member (1) and the second U-shaped member (2) are separated from each other; in the fastened position, the first U-shaped member (1) and the second U-shaped member (2) are close to each other to clamp the battery cell group located in the battery module installation position (4); Two transmission gears (6) are rotatably connected to the connecting member (5) and are respectively transmission-connected to the two first racks (3) to drive the first U-shaped member (1) and the second U-shaped member (2) to switch between the initial position and the fastening position.

2. The battery module fastening device according to claim 1, characterized in that: The connecting member (5) includes a first connecting plate (51) and a second connecting plate (52), the second U-shaped member (2) is provided with a first end plate (201) and a second end plate (202), the first connecting plate (51) is provided with a first connecting portion and a first sliding portion, the first connecting portion is connected to the first end plate (201) of the second U-shaped member (2), and the first sliding portion is slidably connected to the first side plate (101) of the first U-shaped member (1); the second connecting plate (52) is provided with a second connecting portion and a second sliding portion, the second connecting portion is connected to the second end plate (202) of the second U-shaped member (2), and the second sliding portion is slidably connected to the second side plate (102) of the first U-shaped member (1), and the two transmission gears (6) are rotatably connected to the first connecting plate (51) and the second connecting plate (52), respectively.

3. The battery module fastening device according to claim 2, characterized in that: The first sliding portion and the second sliding portion are respectively fixed with a first guide protrusion (511) and a second guide protrusion, the first side plate (101) and the second side plate (102) of the first U-shaped member (1) are respectively provided with a first guide hole (103) and a second guide hole, the first guide protrusion (511) and the second guide protrusion are correspondingly slidably connected in the first guide hole (103) and the second guide hole so that the first U-shaped member (1) switches between the initial position and the fastened position.

4. The battery module fastening device according to claim 2 or 3, characterized in that: The first connecting portion and the second connecting portion are respectively fixed with a first guide block (512) and a second guide block, the first end plate (201) and the second end plate (202) of the second U-shaped member (2) are respectively provided with a first directional hole (203) and a second directional hole, and the first guide block (512) and the second guide block are correspondingly slidably connected in the first directional hole (203) and the second directional hole.

5. The battery module fastening device according to claim 4, characterized in that: The ends of the first end plate (201) and the second end plate (202) of the second U-shaped member (2) are both provided with second racks (7), and the two first racks (3) and the two second racks (7) are arranged in a one-to-one correspondence, wherein a corresponding first rack (3) and a corresponding second rack (7) form a group and are connected by a transmission gear (6) to drive the first rack (3) and the second rack (7) of the same group to move toward or away from each other.

6. The battery module fastening device according to claim 5, characterized in that: It also includes two gear driving members (8), which are respectively mounted on the first connecting plate (51) and the second connecting plate (52) for driving the corresponding transmission gear (6) to rotate.

7. The battery module fastening device according to claim 6, characterized in that: The gear drive member (8) comprises a drive plate (81), the drive plate (81) is provided with an oblong hole (811), a first straight side wall and a second straight side wall are provided on both sides of the oblong hole (811), a third rack (812) is fixed on the first straight side wall, the oblong hole (811) is sleeved on the transmission gear (6), the transmission gear (6) is transmission-connected to the third rack (812), the second straight side wall is in sliding contact with the transmission gear (6), and the third rack (812) drives the transmission gear (6) to rotate so that the first U-shaped member (1) switches between the initial position and the fastened position.

8. The battery module fastening device according to claim 7, characterized in that: The gear drive member (8) further includes a limiting rod (82), which is perpendicular to the axial direction of the oblong hole (811) and has a plurality of through holes (813) on the side wall of the drive plate (81). The plurality of through holes (813) are arranged along the sliding direction of the third rack (812). When the first U-shaped member (1) is located at the fastening position, the limiting rod (82) is passed through the through holes (813), and the limiting rod (82) abuts against the transmission gear (6) to lock the first U-shaped member (1) at the fastening position.

9. The battery module fastening device according to claim 2, characterized in that: It also includes two insulating films (10) and a plurality of mounting members (9), wherein the two insulating films (10) are connected to the first connecting plate (51) and the second connecting plate (52) via the plurality of mounting members (9).

10. The battery module fastening device according to claim 9, characterized in that: The mounting member (9) includes two pulleys (91), a connecting shaft (92) and a clamping member (93). The first connecting plate (51) and the second connecting plate (52) are both provided with a mounting groove (11). The mounting groove (11) is arranged along the direction from the initial position to the fastening position. The two pulleys (91) are rotatably connected to the two ends of the connecting shaft (92). The clamping member (93) is connected to the connecting shaft (92). The two pulleys (91) are rollingly connected in the mounting groove (11) and the clamping member (93) passes through the notch of the mounting groove (11) to clamp the insulating film (10).

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