Sodium-ion battery energy storage battery box with protection structure

Abstract

The invention discloses a sodium ion battery energy storage battery box with a protection structure, and relates to the technical field of sodium ion batteries, the sodium ion battery energy storage battery box comprises a sodium battery box shell, a bottom cover is welded at the bottom end of the sodium battery box shell, an upper cover is mounted at the top end of the sodium battery box shell, and a protection shell is arranged in the sodium battery box shell. A battery cell is arranged in the protective shell; when the protective shell is impacted, the impact on the battery core in the protective shell can be reduced through the telescopic spring, and some sharp objects inserted into the battery core are reduced, so that the protective shell moves relative to the shell of the sodium battery box, and fire disasters caused by impact and extrusion of the sodium battery are reduced; the movement of the protective shell relative to the sodium battery box shell can be slowed down through meshing of the gear and the teeth, the movement of the protective shell can be slowed down through the torsion spring, and the protective shell can be reset through the torsion spring.

Description

Technical Field

[0001] The invention relates to the technical field of sodium ion batteries, and in particular to a sodium ion battery energy storage box with a protective structure. Background Art

[0002] Sodium ion battery energy storage technology is a new type of energy storage technology that uses sodium as the active material of the battery. It is widely used due to its abundant resources, low cost, high safety, long cycle life and wide operating temperature range. Sodium ion batteries are also suitable for electric two-wheeled vehicles, such as electric bicycles and electric motorcycles. The shell of the sodium battery box is an important component in the processing. The structure and shape of the shell of the sodium battery box are crucial to the safety of the sodium battery box.

[0003] In the prior art, sodium-ion battery energy storage battery boxes have certain disadvantages. That is, the shell of the sodium battery box is easily impacted by external force after transportation or installation, which causes the sodium battery box to be deformed by the impact, or the shell of the battery box is easily punctured by sharp objects, which causes the sodium battery box to catch fire, which is quite dangerous. In addition, the battery cell shifts after the battery box is impacted, and the battery cell cannot be restored to its original position. Summary of the invention

[0004] The object of the present invention is to provide a sodium ion battery energy storage battery box with a protective structure to solve the problems raised in the above background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A sodium ion battery energy storage battery box with a protective structure comprises a sodium battery box shell, a bottom cover is welded at the bottom end of the sodium battery box shell, an upper cover is installed at the top end of the sodium battery box shell, a protective shell is arranged inside the sodium battery box shell, a battery core is arranged inside the protective shell, a gap space is formed between the sodium battery box shell and the protective shell, a protective assembly is arranged between the inner wall of the sodium battery box shell and the outer wall of the protective shell, the protective assembly comprises four groups of first connecting blocks, the four groups of first connecting blocks are respectively welded to the four side walls of the protective shell, the number of each group of first connecting blocks is two pairs, a connecting pin is welded on the surface of each first connecting block, a fixing rod is sleeved on the outside of the connecting pin, and the connecting pin is rotatably connected to one end of the fixing rod, a fixing block is arranged at the other end of the fixing rod, and the fixing block is rotatably connected to the fixing rod, a second connecting block is welded on the inner wall of the sodium battery box shell, a threaded rod is arranged in the middle of the second connecting block, the end of the threaded rod is connected to the second connecting block, the fixing block is located outside the threaded rod, a fixing end is arranged at the end of the threaded rod, and a telescopic spring is arranged outside the threaded rod and on one side of the fixing block.

[0007] As a preferred technical solution of the present invention, the threaded rods in the same pair are symmetrically arranged, and the two fixing blocks in the same pair are close to or far away from each other, and the two fixing rods in the same pair are in an eight-shaped shape.

[0008] As a preferred technical solution of the present invention, the diameter of the telescopic spring is smaller than the diameter of the fixed end, nuts are screwed on one end of the threaded rod and on both sides of the second connecting block, the second connecting block is movably connected to the nut, and the threaded rod is threadedly connected to the fixed block, and the spiral directions of the two threaded rods in the same pair are opposite.

[0009] As a preferred technical solution of the present invention, a fixing structure is arranged between the inner wall of the sodium battery box shell and the outer wall of the protective shell, and the fixing structure is arranged at the corners of the four sodium battery box shells and the protective shell, the fixing structure includes a fixing pin, the axial direction of the fixing pin is arranged obliquely with the inner wall of the sodium battery box shell and the outer wall of the protective shell, the two ends of the fixing pin are respectively provided with a first tip and a second tip, a middle section for breaking is opened in the middle of each fixing pin, the middle diameter of the middle section is smaller than the diameter of the fixing pin, and the first tip and the second tip at both ends of the fixing pin are respectively welded to the sodium battery box shell and the protective shell.

[0010] As a preferred technical solution of the present invention, a toggle block is welded at the end of the threaded rod near the fixed pin, and the toggle block rotates synchronously with the threaded rod, and the rotation range of the toggle block contacts the fixed pin, and the toggle block is used to cut off the middle section of the fixed pin.

[0011] As a preferred technical solution of the present invention, the two fixing blocks at the corners are close to each other, and the two fixing blocks at the corners are in contact with the fixing pin, and the fixing blocks are used to cut off the middle section of the fixing pin.

[0012] As a preferred technical solution of the present invention, a buffer structure is arranged between the sodium battery box shell and the protective shell, and the buffer structure includes a first fixing plate and a second fixing plate, and the first fixing plate and the second fixing plate are respectively arranged at the top and the bottom of the protective shell, and both side edges of the first fixing plate and the second side edges of the second fixing plate are provided with first teeth, both sides of the sodium battery box shell are rotatably connected with a plurality of first fixed shafts, and the end of the first fixed shaft and the first gear are arranged between the sodium battery box shell and the protective shell, and the first teeth are meshed with the first gear, and the front and rear ends of the sodium battery box shell are rotatably connected with a plurality of second fixed shafts, and the ends of the second fixed shaft and the second gear, the front and rear ends of the first fixing plate and the front and rear ends of the second fixing plate are provided with second teeth, and the second gear and the second teeth are meshed.

[0013] As a preferred technical solution of the present invention, the first fixed shaft and the second fixed shaft are arranged perpendicular to each other, and the thickness of the first gear is smaller than the width of the first tooth, and the first gear is slidably connected relative to the first tooth while the first gear is meshing with the first tooth, and the thickness of the second gear is smaller than the width of the second tooth, and the second gear is slidably connected to the second gear while the second gear is meshing with the second tooth.

[0014] As a preferred technical solution of the present invention, the outer wall of the sodium battery box shell is provided with a reserved groove at each of the first fixed axis and the second fixed axis, and the first fixed axis and the second fixed axis are located inside the reserved groove, the ends of the first fixed axis and the second fixed axis are provided with a fixed groove, and a torsion spring is clamped inside the fixed groove, and both ends of the torsion spring are clamped with the reserved groove.

[0015] As a preferred technical solution of the present invention, the lower surface of the first fixed plate and the upper surface of the second fixed plate are provided with placement grooves aligned with the protective shell, and the top and bottom ends of the protective shell are respectively clamped with the first fixed plate and the second fixed plate, and the first fixed plate and the second fixed plate move synchronously with the protective shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] A protective assembly is provided, and the protective housing can be initially clamped by the protective assembly of each side wall of the protective housing, so as to avoid a large position change of the protective housing and the outer shell of the sodium battery box when the sodium battery is transported or installed in a vehicle. When the protective housing is impacted, the impact of the battery core inside the protective housing can be reduced by the telescopic spring, thereby playing a protective role;

[0018] A fixing structure is provided, and the protective shell is fixed by a fixing pin, which can reduce the movement of the protective shell relative to the outer shell of the sodium battery box during transportation, and a hollow layer is formed between the protective shell and the outer shell of the sodium battery box, thereby reducing some sharp objects from being inserted into the interior of the battery core, which is safer;

[0019] The toggle block of the protection component cooperates with the fixing pin, and the rotating threaded rod can be used to drive the toggle block to rotate. When the sodium battery is hit, the protection shell is greatly displaced, and the toggle block can cut off the fixing pin, so that the protection shell moves relative to the sodium battery box shell, reducing the fire caused by the impact and extrusion of the sodium battery;

[0020] A buffer structure is provided. When the protective shell moves relative to the sodium battery box shell, the gear and tooth meshing can be used to slow down the movement of the protective shell relative to the sodium battery box shell. Similarly, the torsion spring can be used to slow down the movement of the protective shell, and the torsion spring can also reset the protective shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is the main structure diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the interior of the sodium battery box shell of the present invention;

[0024] Figure 3 It is a schematic diagram of the protection component of the present invention;

[0025] Figure 4 It is a schematic diagram of a fixing block of the present invention;

[0026] Figure 5 It is a schematic diagram of the fixing structure of the present invention;

[0027] Figure 6 It is a schematic diagram of a fixing pin of the present invention;

[0028] Figure 7 It is a schematic diagram of the buffer structure of the present invention;

[0029] Figure 8 It is a schematic diagram of the fixing groove and the torsion spring of the present invention.

[0030] In the figure: 1. sodium battery box shell; 2. upper cover; 3. bottom cover; 4. protective shell; 5. buffer structure; 6. protective assembly; 7. fixing structure; 8. battery core; 51. first fixing plate; 52. second fixing plate; 53. first teeth; 54. first fixing shaft; 55. first gear; 56. second teeth; 57. second fixing shaft; 58. second gear; 59. fixing groove; 510. torsion spring; 511. reserved groove; 61. first connecting block; 62. fixing rod; 63. second connecting block; 64. fixing block; 65. threaded rod; 66. telescopic spring; 67. fixed end; 68. connecting pin; 69. toggle block; 71. fixing pin; 72. first tip; 73. second tip; 74. middle section. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] See also Figure 1-Figure 4As shown, a sodium ion battery energy storage battery box with a protective structure includes a sodium battery box shell 1, a bottom cover 3 is welded to the bottom end of the sodium battery box shell 1, and an upper cover 2 is installed on the top of the sodium battery box shell 1. After the protective shell 4, the buffer structure 5, the protective component 6 and the fixing structure 7 are installed inside the sodium battery box shell 1, the sodium battery box shell 1 and the bottom cover 3 are welded to ensure that the components can be installed inside the sodium battery box shell 1. The sodium battery box shell 1 is provided with a protective shell 4, and the protective shell 4 is provided with a battery core 8. The battery core 8 is initially subjected to a preliminary cleaning by the protective shell 4. Protection, a gap space is formed between the sodium battery box shell 1 and the protective shell 4, and the gap space between the sodium battery box shell 1 and the protective shell 4 slows down the damage of the battery core 8 when a collision occurs. A protective component 6 is arranged between the inner wall of the sodium battery box shell 1 and the outer wall of the protective shell 4. The protective component 6 includes four groups of first connecting blocks 61, and the four groups of first connecting blocks 61 are respectively welded to the four side walls of the protective shell 4. The number of each group of first connecting blocks 61 is two pairs, and the first connecting blocks 61 of the same pair are arranged at the two edges of the side wall of the protective shell 4, and the surface of each first connecting block 61 is welded with a connecting The outer sleeve of the connecting pin 68 is provided with a fixing rod 62, and the connecting pin 68 is rotatably connected to one end of the fixing rod 62, and the other end of the fixing rod 62 is provided with a fixing block 64, and the fixing block 64 is rotatably connected to the fixing rod 62, and the fixing rod 62 can rotate around the connecting pin 68 of the first connecting block 61, so that the fixing rod 62 drives the fixing block 64 to change its position, and the inner wall of the sodium battery box shell 1 is welded with a second connecting block 63, and the middle of the second connecting block 63 is provided with a threaded rod 65, and the end of the threaded rod 65 is connected to the second connecting block 63, and the fixing block 64 is located Outside the threaded rod 65, a fixed end 67 is provided at the end of the threaded rod 65, and a telescopic spring 66 is provided outside the threaded rod 65 and on one side of the fixed block 64. The fixed block 64 that changes position can move along the threaded rod 65, and the threaded rod 65 and the fixed block 64 are connected by a thread, so that the fixed block 64 rotates relatively around the threaded rod 65 and the fixed block 64 moves along the threaded rod 65. The telescopic spring 66 can be used to press the fixed block 64, and the battery core 8 in the protective shell 4 is connected to each fixed rod 62 so that the protective component 6 will not move.

[0034] See also Figure 3 As shown, the threaded rods 65 of the same pair are arranged symmetrically, and the two fixing blocks 64 of the same pair are close to or far away from each other, and the two fixing rods 62 of the same pair are in an eight-shaped shape. The four side walls of the protective shell 4 are provided with fixing rods 62, so that the eight-shaped fixing rods 62 are used to connect and fix each protective shell 4. During normal use, the protective shell 4 is located inside the sodium battery box shell 1. When a collision occurs, the fixing block 64 is acted upon by the telescopic spring 66, thereby limiting the position of the fixing rod 62 of each protective shell 4, and the protective shell 4 can be located inside the sodium battery box shell 1 without moving.

[0035] See also Figure 4 As shown, the diameter of the telescopic spring 66 is smaller than the diameter of the fixed end 67, nuts are screwed on one end of the threaded rod 65 and both sides of the second connecting block 63, and the second connecting block 63 is movably connected to the nuts, and the threaded rod 65 is threadedly connected to the fixed block 64, and the spiral directions of the two threaded rods 65 of the same pair are opposite, and the fixed block 64 of the fixed rod 62 moves along the threaded rod 65, so that the telescopic spring 66 can continue to move against the fixed block 64, which can reduce the impact of the protective shell 4 during collision, and the protective component 6 is located on the four side walls of the protective shell 4, which can prevent the protective shell 4 from moving from different angles.

[0036] It should be noted that the protective shell 4 is placed inside the sodium battery box shell 1, and the buffer structure 5, the protective assembly 6 and the fixing structure 7 are installed between the sodium battery box shell 1 and the protective shell 4, the bottom cover 3 is welded to the bottom end of the sodium battery box shell 1, and the upper cover 2 is installed on the top of the sodium battery box shell 1 by bolts. When the sodium battery is installed on the electric bicycle, the protective shell 4 can be preliminarily fixed by the protective assembly 6. Specifically, the protective shell 4 is located inside the sodium battery box shell 1, and the four side walls of the protective shell 4 are restricted by the fixing rod 62 in an eight-shaped shape to prevent the protective shell 4 from moving in one direction. Similarly, the telescopic spring 66 can be used to prevent the fixing block 64 from continuing to move along the threaded rod 65, and the threaded rod 65 rotates around the second connecting block 63.

[0037] See also Figure 2 , Figure 5 and Figure 6 As shown, a fixing structure 7 is provided between the inner wall of the sodium battery box shell 1 and the outer wall of the protective shell 4, and the fixing structure 7 is provided at the corners of the four sodium battery box shells 1 and the protective shell 4, the fixing structure 7 includes a fixing pin 71, the axial direction of the fixing pin 71 is arranged obliquely with the inner wall of the sodium battery box shell 1 and the outer wall of the protective shell 4, and the two ends of the fixing pin 71 are respectively provided with a first tip 72 and a second tip 73, and the middle of each fixing pin 71 is provided with a middle section 74 for breaking, and the middle diameter of the middle section 74 is smaller than the diameter of the fixing pin 71, and the first tip 72 and the second tip 73 at the two ends of the fixing pin 71 are respectively welded to the sodium battery box shell 1 and the protective shell 4, and the sodium battery box shell 1 and the protective shell 4 can be welded to each other through the fixing pin 71, and the diameters of the two ends and the middle position of the fixing pin 71 are smaller than the diameter of the fixing pin 71, so that the two ends and the middle position of the fixing pin 71 can preliminarily fix the protective shell 4.

[0038] See also Figure 5 and Figure 6As shown, a toggle block 69 is welded at the end of the threaded rod 65 and near the fixed pin 71, and the toggle block 69 rotates synchronously with the threaded rod 65, and the rotation range of the toggle block 69 is in contact with the fixed pin 71. The toggle block 69 is used to cut off the middle section 74 of the fixed pin 71. Since the fixed block 64 and the threaded rod 65 cooperate to drive the toggle block 69 to rotate, the fixed pin 71 can be knocked by the rotating toggle block 69 at this time, and the fixed pin 71 can be broken when subjected to a relatively large impact force.

[0039] See also Figure 5 and Figure 6 As shown, the two fixing blocks 64 at the corners are close to each other, and the two fixing blocks 64 at the corners are in contact with the fixing pin 71. The fixing block 64 is used to cut off the middle section 74 of the fixing pin 71. When the impact force is relatively large, the protective shell 4 pushes the fixing block 64 to move so that the fixing block 64 breaks the fixing pin 71. In the event of a large impact, the protective shell 4 can be moved slightly to reduce the possibility of fire of the sodium battery after the impact.

[0040] It should be noted that when the sodium battery box shell 1 is hit, the protective shell 4 inside the sodium battery box shell 1 moves. At this time, the protective shell 4 moves in one direction. At this time, the protective shell 4 pushes the fixing rod 62 to move the fixing block 64 along the threaded rod 65, and the fixing block 64 moves toward the fixing pin 71. At this time, the two fixing blocks 64 at the corners contact the fixing pin 71, and the diameter of the fixing pin 71 is larger than the diameters of the first tip 72, the second tip 73 and the middle section 74, so that the fixing block 64 can break the fixing pin 71. Similarly, the rotation of the threaded rod 65 will drive the toggle block 69 to rotate, and the fixing pin 71 can also be broken by the toggle block 69.

[0041] See also Figure 2 and Figure 7As shown, a buffer structure 5 is arranged between the sodium battery box shell 1 and the protective shell 4, and the buffer structure 5 includes a first fixing plate 51 and a second fixing plate 52, and the first fixing plate 51 and the second fixing plate 52 are respectively arranged at the top and the bottom of the protective shell 4, and the battery core 8 is wrapped in the first fixing plate 51, the second fixing plate 52 and the protective shell 4. The side edges of the first fixing plate 51 and the side edges of the second fixing plate 52 are both provided with first teeth 53, and the two sides of the sodium battery box shell 1 are rotatably connected with a plurality of first fixed shafts 54, and the end of the first fixed shaft 54 ​​and the first gear 55 are arranged between the sodium battery box shell 1 and the protective shell 4, and the first teeth 53 and the first gear 55 are meshed, and the protective shell 4 moves the protective shell 4 along the front and rear directions after being hit. After moving, at this time, the first teeth 53 of the first fixing plate 51 and the second fixing plate 52 are meshed with the first gear 55, so that the first gear 55 limits the movement of the first fixing plate 51 and the second fixing plate 52 of the protective shell 4, which can reduce the impact of the protective shell 4, and the front and rear ends of the sodium battery box shell 1 are rotatably connected with a plurality of second fixed shafts 57, and the ends of the second fixed shafts 57 are connected with the second gears 58, and the front and rear end edges of the first fixing plate 51 and the front and rear end edges of the second fixing plate 52 are provided with second teeth 56, and the second gears 58 and the second teeth 56 are meshed. When the protective shell 4 is hit on both sides of the sodium battery box shell 1, the moving protective shell 4 drives the second gear 58 to mesh with the second teeth 56, so that the second gear 58 can reduce the impact on the protective shell 4.

[0042] See also Figure 7 As shown, the first fixed shaft 54 ​​and the second fixed shaft 57 are arranged perpendicular to each other, and the thickness of the first gear 55 is smaller than the width of the first tooth 53. When the first gear 55 meshes with the first tooth 53, the first gear 55 is slidably connected relative to the first tooth 53. The thickness of the second gear 58 is smaller than the width of the second tooth 56. When the second gear 58 and the second tooth 56 mesh, the second tooth 56 and the second gear 58 are slidably connected. Since the thickness of each gear is smaller than the width of the corresponding tooth, the gears can mesh with the teeth when the first fixed plate 51 and the second fixed plate 52 move in different directions, and the protective shell 4 can be restricted from continuing to move at any time after being hit.

[0043] See also Figure 8As shown, a reserved groove 511 is provided on the outer wall of the sodium battery box shell 1 and at each of the first fixed shaft 54 ​​and the second fixed shaft 57, and the first fixed shaft 54 ​​and the second fixed shaft 57 are located inside the reserved groove 511, and the ends of the first fixed shaft 54 ​​and the second fixed shaft 57 are provided with a fixed groove 59, and a torsion spring 510 is clamped inside the fixed groove 59, and both ends of the torsion spring 510 are clamped with the reserved groove 511. When the first fixed shaft 54 ​​and the second fixed shaft 57 rotate, the fixed groove 59 will be driven to rotate, and the torsion spring 510 in the fixed groove 59 will also rotate, which can limit the first fixed shaft 54 ​​and the second fixed shaft 57 from continuing to rotate, and the torsion spring 510 can also be used to rotate the first fixed shaft 54 ​​and the second fixed shaft 57 in the opposite direction, so as to reset the first fixed plate 51 and the second fixed plate 52 to their original positions.

[0044] See also Figure 2 and Figure 8 As shown, a placement groove aligned with the protective shell 4 is provided on the lower surface of the first fixing plate 51 and the upper surface of the second fixing plate 52, and the top and bottom ends of the protective shell 4 are clamped with the first fixing plate 51 and the second fixing plate 52 respectively, and the first fixing plate 51 and the second fixing plate 52 move synchronously with the protective shell 4. When the protective shell 4 moves, the first fixing plate 51 and the second fixing plate 52 also move, and the first fixing plate 51 and the second fixing plate 52 can be inside the placement groove, ensuring that the first fixing plate 51 and the second fixing plate 52 will not be affected by the inner wall of the sodium battery box shell 1.

[0045] It should be noted that when the protective shell 4 is hit from different directions, it will cause the protective shell 4 to move along the first fixed axis 54 and the second fixed axis 57. When the protective shell 4 moves along the axial direction of the first fixed axis 54, the first fixed plate 51 and the second fixed plate 52 of the protective shell 4 move relative to the second gear 58, and the second gear 58 is meshed with the second tooth 56, so that the protective shell 4 can be restricted from continuing to move. At the same time, the second fixed axis 57 is prevented from continuing to rotate by the torsion spring 510, and the second fixed axis 57 and the protective shell 4 can be reset by the torsion spring 510. When the protective shell 4 moves along the axial direction of the second fixed axis 57, the first fixed plate 51 and the second fixed plate 52 of the sodium battery box housing 1 move relative to the first gear 55, and the first gear 55 is meshed with the first tooth 53, which can restrict the protective shell 4 from continuing to move. At the same time, the first fixed axis 54 is prevented from continuing to rotate by the torsion spring 510, and the first fixed axis 54 and the protective shell 4 can be reset by the torsion spring 510, thereby reducing the impact caused by the collision.

[0046] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sodium ion battery energy storage box with a protective structure, comprising a sodium battery box shell (1), a bottom cover (3) welded to the bottom end of the sodium battery box shell (1), and an upper cover (2) installed on the top end of the sodium battery box shell (1), characterized in that: A protective shell (4) is arranged inside the sodium battery box shell (1), a battery core (8) is arranged inside the protective shell (4), a gap space is formed between the sodium battery box shell (1) and the protective shell (4), a protective assembly (6) is arranged between the inner wall of the sodium battery box shell (1) and the outer wall of the protective shell (4), the protective assembly (6) comprises four groups of first connecting blocks (61), the four groups of first connecting blocks (61) are respectively welded to four side walls of the protective shell (4), each group of first connecting blocks (61) has two pairs, a connecting pin (68) is welded on the surface of each first connecting block (61), and a fixing sleeve is arranged on the outer side of the connecting pin (68). A rod (62) is provided, and a connecting pin (68) is rotatably connected to one end of the fixing rod (62); a fixing block (64) is provided at the other end of the fixing rod (62); and the fixing block (64) is rotatably connected to the fixing rod (62); a second connecting block (63) is welded to the inner wall of the sodium battery box shell (1); a threaded rod (65) is provided in the middle of the second connecting block (63); the end of the threaded rod (65) is connected to the second connecting block (63); the fixing block (64) is located outside the threaded rod (65); a fixing end (67) is provided at the end of the threaded rod (65); and a telescopic spring (66) is provided outside the threaded rod (65) and located on one side of the fixing block (64).

2. A sodium ion battery energy storage box with a protective structure according to claim 1, characterized in that: The threaded rods (65) of the same pair are symmetrically arranged, and the two fixing blocks (64) of the same pair are close to or far away from each other, and the two fixing rods (62) of the same pair are in an eight-shaped shape.

3. A sodium ion battery energy storage box with a protective structure according to claim 2, characterized in that: The diameter of the telescopic spring (66) is smaller than the diameter of the fixed end (67); nuts are screwed onto one end of the threaded rod (65) and both sides of the second connecting block (63); the second connecting block (63) is movably connected to the nuts; the threaded rod (65) is threadedly connected to the fixed block (64); and the spiral directions of the two threaded rods (65) in the same pair are opposite.

4. A sodium ion battery energy storage battery box with a protective structure according to claim 3, characterized in that: A fixing structure (7) is arranged between the inner wall of the sodium battery box shell (1) and the outer wall of the protective shell (4), and the fixing structure (7) is arranged at the corners of the four sodium battery box shells (1) and the protective shell (4). The fixing structure (7) comprises a fixing pin (71), the axis direction of the fixing pin (71) is arranged obliquely with the inner wall of the sodium battery box shell (1) and the outer wall of the protective shell (4), and the two ends of the fixing pin (71) are respectively provided with a first tip (72) and a second tip (73), and the middle of each fixing pin (71) is provided with a middle section (74) for breaking, and the middle diameter of the middle section (74) is smaller than the diameter of the fixing pin (71), and the first tip (72) and the second tip (73) at the two ends of the fixing pin (71) are respectively welded to the sodium battery box shell (1) and the protective shell (4).

5. The sodium ion battery energy storage box with a protective structure according to claim 4, characterized in that: A toggle block (69) is welded at the end of the threaded rod (65) near the fixed pin (71), and the toggle block (69) rotates synchronously with the threaded rod (65), and the rotation range of the toggle block (69) contacts the fixed pin (71), and the toggle block (69) is used to cut off the middle section (74) of the fixed pin (71).

6. The sodium ion battery energy storage box with a protective structure according to claim 4, characterized in that: The two fixing blocks (64) at the corners are close to each other, and the two fixing blocks (64) at the corners are in contact with the fixing pin (71), and the fixing blocks (64) are used to cut off the middle section (74) of the fixing pin (71).

7. A sodium ion battery energy storage box with a protective structure according to any one of claims 1 to 6, characterized in that: A buffer structure (5) is provided between the sodium battery box shell (1) and the protective shell (4), and the buffer structure (5) comprises a first fixing plate (51) and a second fixing plate (52), and the first fixing plate (51) and the second fixing plate (52) are respectively provided at the top and bottom ends of the protective shell (4), and first teeth (53) are provided on both side edges of the first fixing plate (51) and the second fixing plate (52), and a plurality of first fixing shafts (54) are rotatably connected to both sides of the sodium battery box shell (1), and the first fixing shafts (54) are provided on both sides of the sodium battery box shell (1). A first gear (55) is provided at the end of the shaft (54) and between the sodium battery box shell (1) and the protective shell (4); the first teeth (53) mesh with the first gear (55); the front and rear ends of the sodium battery box shell (1) are rotatably connected to a plurality of second fixed shafts (57); the ends of the second fixed shafts (57) and the second gear (58), the front and rear edges of the first fixed plate (51) and the front and rear edges of the second fixed plate (52) are provided with second teeth (56); the second gear (58) mesh with the second teeth (56).

8. The sodium ion battery energy storage box with a protective structure according to claim 7, characterized in that: The first fixed shaft (54) and the second fixed shaft (57) are arranged perpendicular to each other, and the thickness of the first gear (55) is smaller than the width of the first tooth (53). When the first gear (55) is meshed with the first tooth (53), the first gear (55) is slidably connected relative to the first tooth (53). The thickness of the second gear (58) is smaller than the width of the second tooth (56). When the second gear (58) is meshed with the second tooth (56), the second tooth (56) and the second gear (58) are slidably connected.

9. A sodium ion battery energy storage box with a protective structure according to claim 8, characterized in that: The outer wall of the sodium battery box shell (1) is provided with a reserved groove (511) at each of the first fixed shaft (54) and the second fixed shaft (57), and the first fixed shaft (54) and the second fixed shaft (57) are located inside the reserved groove (511), the ends of the first fixed shaft (54) and the second fixed shaft (57) are provided with a fixed groove (59), and a torsion spring (510) is clamped inside the fixed groove (59), and both ends of the torsion spring (510) are clamped with the reserved groove (511).

10. The sodium ion battery energy storage box with a protective structure according to claim 9, characterized in that: The lower surface of the first fixing plate (51) and the upper surface of the second fixing plate (52) are provided with placement grooves aligned with the protective shell (4), and the top and bottom ends of the protective shell (4) are clamped with the first fixing plate (51) and the second fixing plate (52) respectively, and the first fixing plate (51) and the second fixing plate (52) move synchronously with the protective shell (4).

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