Positive electrode material synthesis method for lithium vanadium fluorophosphate lithium-ion battery, and lithium vanadium fluorophosphate lithium-ion battery

Abstract

A positive electrode material synthesis method for a lithium vanadium fluorophosphate lithium-ion battery, and a lithium vanadium fluorophosphate lithium-ion battery, relating to the technical field of lithium batteries. The lithium vanadium fluorophosphate lithium-ion battery comprises a battery case (1) and several battery cells (2), wherein each battery cell (2) consists of a lithium vanadium fluorophosphate positive electrode sheet (21), a lithium vanadium fluorophosphate negative electrode sheet (22) and a separator (23); a battery cover plate (11) is detachably mounted on the upper end surface of the battery case (1); the battery case (1) is internally provided with a fixing mechanism (3) for the battery cells (2); a sealing mechanism (5) is disposed between the battery case (1) and the battery cover plate (11); the battery case (1) is further internally provided with a heat-dissipating mechanism (6); and several uniformly distributed wiring slots (12) are formed in the surface of the battery cover plate (11). By putting the battery cells (2) between four limiting plates (31) and driving the limiting plates (31) to approach each other, the limiting plates (31) limit and fix the battery cells (2), such that the battery cells (2) are fixed inside the battery case (1), thereby easily fixing and mounting the battery cells (2), and also easily fixing and mounting different quantities of battery cells (2) inside the battery case (1).

Description

A method for synthesizing positive electrode material of lithium vanadium fluorophosphate lithium-ion battery and lithium vanadium fluorophosphate lithium-ion battery Technical Field

[0001] The present invention relates to the technical field of lithium batteries, in particular to a lithium vanadium fluorophosphate lithium-ion battery positive electrode material and a synthesis method thereof. Background Art

[0002] Lithium batteries are primary batteries that use lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. They are different from rechargeable lithium-ion batteries and lithium-ion polymer batteries. Due to the highly active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been widely used for a long time. With the development of microelectronics technology in the late 20th century, the number of miniaturized devices has increased, which has put forward higher requirements for power sources. Lithium batteries have entered the stage of large-scale practical application.

[0003] However, the lithium vanadium fluorophosphate cathode material lithium battery in the prior art still has some defects:

[0004] 1. In the prior art, lithium batteries using lithium vanadium fluorophosphate as the positive electrode material mostly use welding to fix the battery casing, so that the battery casing outside the battery core is sealed, making it inconvenient to remove and replace the battery core inside the battery casing. At the same time, in the prior art, lithium vanadium fluorophosphate as the positive electrode material lithium batteries are not convenient to fix different numbers of battery cells inside the battery casing;

[0005] 2. At the same time, most of the lithium batteries using lithium vanadium fluorophosphate as positive electrode materials in the prior art are not convenient for dissipating heat from the battery core, which has a certain impact on the service life of the battery core;

[0006] In response to the above problems, the inventors proposed a lithium vanadium fluorophosphate lithium-ion battery positive electrode material and a synthesis method thereof to solve the above problems. Summary of the Invention

[0007] In order to solve the problem that the battery core of lithium battery with lithium vanadium fluorophosphate positive electrode material is inconvenient to install and the heat dissipation effect of the battery core is poor; the purpose of the present invention is to provide a lithium vanadium fluorophosphate lithium-ion battery positive electrode material and a synthesis method thereof.

[0008] To solve the above technical problems, the present invention adopts the following technical solution: a lithium vanadium fluorophosphate lithium-ion battery positive electrode material, including a battery housing and several battery cores, the battery cores are composed of a lithium vanadium fluorophosphate positive electrode sheet, a lithium vanadium fluorophosphate negative electrode sheet and a diaphragm, the upper end surface of the battery housing is detachably mounted with a battery cover, the interior of the battery housing is provided with a fixing mechanism for the battery core, a sealing mechanism is provided between the battery housing and the battery cover, and the interior of the battery housing is also provided with a heat dissipation mechanism.

[0009] Preferably, a plurality of evenly distributed wiring slots are provided on the surface of the battery cover.

[0010] Preferably, the fixing mechanism includes a plurality of limit plates, the side wall of the battery housing is provided with a plurality of evenly distributed slide grooves, the inner wall of the slide groove is slidably mounted with a slider, one side of the slider is fixedly connected to the limit plate, the side wall of the battery housing is rotatably mounted with a plurality of evenly distributed threaded rods, the threaded rods pass through the slide groove and are threadably connected to the slider, and a first bevel gear is fixedly mounted on one end of the threaded rod.

[0011] Preferably, a plurality of evenly distributed rotating rods are rotatably mounted inside the battery housing, a second bevel gear is fixedly mounted on one end of the rotating rod, and one of the second bevel gears is meshedly connected with two adjacent first bevel gears.

[0012] Preferably, a worm gear is fixedly mounted on one end of the rotating rod away from the second bevel gear, and a plurality of evenly distributed worms are rotatably mounted on both sides of the battery housing, and the worms are meshingly connected with the worm gear.

[0013] Preferably, the fixing mechanism further includes a plurality of first limiting plates and a plurality of second limiting plates, wherein the first limiting plates are fixedly mounted on the bottom wall of the battery housing, and the second limiting plates are fixedly mounted on the lower surface of the battery cover.

[0014] Preferably, a knob is fixedly installed at one end of the worm, a first protective pad is fixedly installed on one side of the limit plate, a second protective pad is fixedly installed on one side of the first limit plate and the second limit plate, and the second protective pad is in movable contact with the upper and lower surfaces of the battery core.

[0015] Preferably, the sealing mechanism includes four L-shaped locking plates, and the battery shell is provided with L-shaped locking grooves on all four sides, and the L-shaped locking plates and the inner walls of the L-shaped locking grooves are movably plugged into each other, and the battery cover is provided with slots on all four sides, and a rotating shaft is rotatably installed on the inner wall of the slot, and a connecting seat is fixedly installed on the middle of the rotating shaft, and a connecting block is fixedly installed on the outer wall of the connecting seat, one end of the connecting block is fixedly connected to the L-shaped locking plate, and both ends of the rotating shaft are sleeved with a torsion spring, one end of the torsion spring is fixedly connected to the inner wall of the slot, and the other end of the torsion spring is fixedly connected to one end of the connecting seat, and a toggle block is fixedly installed on the outer wall of the connecting seat, and a return-shaped sealing gasket is fixedly installed on the lower surface of the battery cover, and a return-shaped groove is provided on the upper surface of the battery shell, and the return-shaped sealing gasket is movably contacted with the inner wall of the return-shaped groove.

[0016] Preferably, the heat dissipation mechanism includes several loop-shaped circulation pipes, the outer walls of the loop-shaped circulation pipes are fixedly installed with evenly distributed support rods, the ends of the support rods away from the loop-shaped circulation pipes are fixedly connected to the side walls of the battery casing, connecting pipes are fixedly installed between the loop-shaped circulation pipes, one of the loop-shaped circulation pipes is fixedly installed with a liquid inlet pipe, and the other loop-shaped circulation pipe is fixedly installed with a liquid discharge pipe, and the ends of the liquid inlet pipe and the liquid discharge pipe away from the loop-shaped circulation pipe are both movably connected with sealing plugs.

[0017] A method for synthesizing a positive electrode material for a lithium vanadium fluorophosphate lithium-ion battery comprises the following steps:

[0018] S1. Introducing a fixed amount of lithium vanadium phosphate fluoride and asphalt into a stirring tank of a stirring device, stirring the lithium vanadium phosphate fluoride and asphalt at a high speed of 1000-10000 rpm and a temperature of 20-25° C. to obtain a coating;

[0019] S2. The obtained coated material is placed in a sintering furnace for high-temperature calcination. Inert gas is added during the calcination process. The inert gas is helium. The calcination temperature is 1200° C.-1500° C. After the calcination, lithium vanadium fluorophosphate lithium-ion battery positive electrode material is obtained.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, by placing the battery cell between four limiting plates and driving the limiting plates closer to each other, the limiting plates limit and fix the battery cell so that the battery cell is fixed inside the battery housing, thereby conveniently achieving fixed installation of the battery cell and facilitating fixed installation of different numbers of battery cells inside the battery housing;

[0022] 2. In the present invention, by placing the battery cover on the upper end surface of the battery housing and inserting the L-shaped locking plate into the L-shaped locking groove, the L-shaped locking plate fixes the battery cover to the upper end surface of the battery housing through the L-shaped locking groove, thereby conveniently achieving a sealed fixation of the battery cover. Compared with the existing technology of fixing the battery cover by welding, it is convenient for subsequent operators to disassemble and maintain the battery cells in the battery housing;

[0023] 3. In the present invention, by injecting the coolant into the circular circulation pipe, the coolant circulates in multiple circular circulation pipes through the connecting pipe. At the same time, the coolant takes away the high-temperature airflow in the battery casing and is discharged through the drain pipe, thereby conveniently realizing the heat dissipation of the battery core and effectively improving the service life of the battery core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] FIG1 is a schematic diagram of the overall structure of a lithium vanadium fluorophosphate lithium-ion battery positive electrode material according to the present invention.

[0026] FIG2 is an enlarged schematic diagram of portion A in FIG1 of the present invention.

[0027] FIG3 is another schematic diagram of the overall structure of a lithium vanadium fluorophosphate lithium-ion battery positive electrode material according to the present invention.

[0028] FIG4 is a schematic diagram of the separation structure of the battery cover and the battery shell of the present invention.

[0029] FIG5 is a schematic diagram of the cross-sectional structure of the battery cover of the present invention.

[0030] FIG6 is a schematic diagram of the cross-sectional structure of the battery housing of the present invention.

[0031] FIG7 is an enlarged schematic diagram of portion B in FIG6 of the present invention.

[0032] FIG8 is a schematic diagram of the connection structure of the fixing mechanism of the present invention.

[0033] FIG9 is a schematic diagram of the connection structure of the heat dissipation mechanism of the present invention.

[0034] FIG10 is an enlarged schematic diagram of portion C in FIG9 of the present invention.

[0035] FIG11 is a schematic diagram of the composition structure of the battery core of the present invention.

[0036] In the figure: 1. Battery housing; 11. Battery cover; 12. Wiring slot; 2. Battery cell; 21. Lithium vanadium fluorophosphate positive electrode; 22. Lithium vanadium fluorophosphate negative electrode; 23. Diaphragm; 3. Fixing mechanism; 31. Limiting plate; 32. First protective pad; 33. Slide; 34. Slider; 35. Threaded rod; 36. First bevel gear; 37. Rotating rod; 38. Second bevel gear; 39. Worm gear; 4. Worm; 41. Knob; 42. First limit Plate; 43. Second limit plate; 44. Second protective pad; 5. Sealing mechanism; 51. L-shaped locking plate; 52. L-shaped locking groove; 53. Notch; 54. Rotating shaft; 55. Connecting seat; 56. Connecting block; 57. Toggle block; 58. Torsion spring; 59. Return-shaped sealing gasket; 591. Return-shaped groove; 6. Heat dissipation mechanism; 61. Return-shaped circulation pipe; 62. Support rod; 63. Connecting pipe; 64. Liquid inlet pipe; 65. Liquid discharge pipe; 66. Sealing plug. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Embodiment: As shown in Figures 1-11, the present invention provides a lithium vanadium fluorophosphate lithium-ion battery positive electrode material, including a battery housing 1 and several battery cores 2, the battery core 2 is composed of a lithium vanadium fluorophosphate positive electrode sheet 21, a lithium vanadium fluorophosphate negative electrode sheet 22 and a diaphragm 23, the upper end surface of the battery housing 1 is detachably mounted with a battery cover 11, the interior of the battery housing 1 is provided with a fixing mechanism 3 for the battery core 2, a sealing mechanism 5 is provided between the battery housing 1 and the battery cover 11, and the interior of the battery housing 1 is also provided with a heat dissipation mechanism 6.

[0039] By adopting the above technical solution, a fixing mechanism 3 is provided, which fixes the battery core 2 so that the battery core 2 is fixed inside the battery casing 1, thereby facilitating the fixed installation of different numbers of battery cores 2 inside the battery casing 1. A sealing mechanism 5 is provided, which seals and fixes the battery cover 11 to the upper end surface of the battery casing 1. Compared with the existing technology, the battery cover 11 is fixed by welding, which facilitates the maintenance of the battery core 2 inside the battery casing 1 by the operator. A heat dissipation mechanism 6 is provided, which takes away the high-temperature airflow inside the battery casing 1, thereby dissipating heat from the battery core 2 and improving the service life of the battery core 2.

[0040] A plurality of wiring slots 12 are evenly distributed on the surface of the battery cover 11 .

[0041] By adopting the above technical solution and providing the wiring slot 12 , it is convenient to insert the wiring of the battery core 2 into the battery housing 1 and connect with the battery core 2 .

[0042] The fixing mechanism 3 includes several limit plates 31, and the side wall of the battery housing 1 is provided with several evenly distributed slide grooves 33. A slider 34 is slidably installed on the inner wall of the slide groove 33. One side of the slider 34 is fixedly connected to the limit plate 31. The side wall of the battery housing 1 is rotatably installed with several evenly distributed threaded rods 35. The threaded rods 35 pass through the slide groove 33 and are threadedly rotatably connected to the slider 34. One end of the threaded rod 35 is fixedly installed with a first bevel gear 36.

[0043] By adopting the above technical solution, a limit plate 31 is set, which limits the battery core 2 so that the battery core 2 is fixed inside the battery housing 1. By rotating the first bevel gear 36, the first bevel gear 36 rotates the threaded rod 35, and the threaded rod 35 drives the slider 34 to slide horizontally along the inner wall of the slide groove 33, and the slider 34 moves the limit plate 31 horizontally.

[0044] A plurality of evenly distributed rotating rods 37 are rotatably mounted inside the battery housing 1 . A second bevel gear 38 is fixedly mounted on one end of the rotating rod 37 . One second bevel gear 38 is meshedly connected with two adjacent first bevel gears 36 .

[0045] By adopting the above technical solution, by rotating the rotating rod 37, the rotating rod 37 rotates the second bevel gear 38, and the second bevel gear 38 causes the two threaded rods 35 to rotate synchronously in opposite directions through the two first bevel gears 36, thereby causing the two sliders 34 to slide toward or away from each other synchronously.

[0046] A worm gear 39 is fixedly mounted on one end of the rotating rod 37 away from the second bevel gear 38 , and a number of evenly distributed worms 4 are rotatably mounted on both sides of the battery housing 1 , and the worms 4 are meshed with the worm gear 39 .

[0047] By adopting the above technical solution, the worm 4 is rotated, the worm 4 drives the worm wheel 39 to rotate, and the worm wheel 39 rotates the rotating rod 37.

[0048] The fixing mechanism 3 further includes a plurality of first limiting plates 42 and a plurality of second limiting plates 43 . The first limiting plates 42 are fixedly mounted on the bottom wall of the battery housing 1 , and the second limiting plates 43 are fixedly mounted on the lower surface of the battery cover 11 .

[0049] By adopting the above technical solution, by setting the first limiting plate 42 and the second limiting plate 43, the first limiting plate 42 supports the lower end surface of the battery core 2, and the second limiting plate 43 limits the upper end surface of the battery core 2, thereby improving the stability of the battery core 2.

[0050] A knob 41 is fixedly installed at one end of the worm 4, a first protective pad 32 is fixedly installed on one side of the limiting plate 31, and a second protective pad 44 is fixedly installed on one side of the first limiting plate 42 and the second limiting plate 43. The second protective pad 44 is in active contact with the upper and lower surfaces of the battery core 2.

[0051] By adopting the above technical solution, the knob 41 is manually rotated to rotate the worm 4 , and the first protective pad 32 and the second protective pad 44 are provided to prevent the outer shell of the battery core 2 from being worn.

[0052] The sealing mechanism 5 includes four L-shaped locking plates 51. L-shaped locking grooves 52 are provided around the battery shell 1. The inner walls of the L-shaped locking plates 51 and the L-shaped locking grooves 52 are movably plugged in. Notches 53 are provided around the battery cover 11. A rotating shaft 54 ​​is rotatably installed on the inner wall of the notch 53. A connecting seat 55 is fixedly installed in the middle of the rotating shaft 54. A connecting block 56 is fixedly installed on the outer wall of the connecting seat 55. One end of the connecting block 56 is fixedly connected to the L-shaped locking plate 51. Both ends of the rotating shaft 54 ​​are sleeved with a torsion spring 58. One end of the torsion spring 58 is fixedly connected to the inner wall of the notch 53, and the other end of the torsion spring 58 is fixedly connected to one end of the connecting seat 55. A toggle block 57 is fixedly installed on the outer wall of the connecting seat 55. A return-shaped sealing gasket 59 is fixedly installed on the lower surface of the battery cover 11. A return-shaped groove 591 is provided on the upper surface of the battery shell 1. The return-shaped sealing gasket 59 is in movably contact with the inner wall of the return-shaped groove 591.

[0053] By adopting the above technical solution, by setting the L-shaped locking plate 51 and the L-shaped locking groove 52, when the L-shaped locking plate 51 enters the interior of the L-shaped locking groove 52, the L-shaped locking plate 51 fixes the battery cover 11 to the upper end surface of the battery housing 1 through the L-shaped locking groove 52, and by setting the rotating shaft 54, the connecting seat 55, the connecting block 56 and the torsion spring 58, the initial state of the torsion spring 58 makes the L-shaped locking plate 51 always stick to the inner wall of the L-shaped locking groove 52 through the connecting seat 55 and the connecting block 56. By providing a toggle block 57, it is convenient for the operator to manually toggle the connecting seat 55 to rotate. The connecting seat 55 flips the L-shaped locking plate 51 in the opposite direction through the connecting block 56, so that the L-shaped locking plate 51 is separated from the L-shaped locking groove 52. By providing a return-shaped sealing gasket 59 and a return-shaped groove 591, when the battery cover 11 is fixed to the upper end surface of the battery shell 1, the return-shaped sealing gasket 59 enters the interior of the return-shaped groove 591, thereby improving the sealing between the battery cover 11 and the battery shell 1.

[0054] The heat dissipation mechanism 6 includes several circular circulation pipes 61, and the outer wall of the circular circulation pipe 61 is fixedly installed with evenly distributed support rods 62. The end of the support rod 62 away from the circular circulation pipe 61 is fixedly connected to the side wall of the battery casing 1. Connecting pipes 63 are fixedly installed between the circular circulation pipes 61. A liquid inlet pipe 64 is fixedly installed on one of the circular circulation pipes 61, and a liquid discharge pipe 65 is fixedly installed on the other circular circulation pipe 61. The ends of the liquid inlet pipe 64 and the liquid discharge pipe 65 away from the circular circulation pipe 61 are both movably connected with sealing plugs 66.

[0055] By adopting the above technical solution, the coolant is injected into the circular circulation pipe 61 through the liquid inlet pipe 64, and the coolant circulates in multiple circular circulation pipes 61 through the connecting pipe 63. The coolant takes away the high-temperature airflow in the battery casing 1. At the same time, the coolant is discharged through the drain pipe 65. By setting the support rod 62, the support rod 62 supports and fixes the circular circulation pipe 61, thereby improving the stability of the circular circulation pipe 61. By setting the sealing plug 66, after pulling out the sealing plug 66, it is convenient to inject coolant into the circular circulation pipe 61, and at the same time, it is convenient to discharge the coolant.

[0056] The present invention also provides a method for synthesizing a positive electrode material for a lithium vanadium fluorophosphate lithium-ion battery, comprising the following steps:

[0057] S1. Introducing a fixed amount of lithium vanadium phosphate fluoride and asphalt into a stirring tank of a stirring device, stirring the lithium vanadium phosphate fluoride and asphalt at a high speed of 1000-10000 rpm and a temperature of 20-25° C. to obtain a coating;

[0058] S2. The obtained coated material is placed in a sintering furnace for high-temperature calcination. Inert gas is added during the calcination process. Helium is used as the inert gas. The calcination temperature is 1200° C.-1500° C. After the calcination, lithium vanadium fluorophosphate lithium-ion battery positive electrode material is obtained.

[0059] Working principle: when it is necessary to fix the battery cell 2, the operator first places the battery cell 2 between the four adjacent limiting plates 31. At the same time, the lower surface of the battery cell 2 contacts the second protective pads 44 on the upper surfaces of the two adjacent first limiting plates 42. Then, the two knobs 41 are manually rotated. The knob 41 rotates the worm 4, the worm 4 rotates the worm gear 39, the worm gear 39 rotates the rotating rod 37, the rotating rod 37 rotates the second bevel gear 38, and the second bevel gear 38 rotates the two threaded rods 35 synchronously and oppositely through the two first bevel gears 36. The two threaded rods 35 cause the two sliders 34 to slide toward each other along the inner walls of the corresponding slide grooves 33. The two sliders 34 bring the two limiting plates 31 close to each other. At this time, the four limiting plates 31 limit the battery cell 2 through the four first protective pads 32, so that the battery cell 2 is fixed inside the battery shell 1, thereby conveniently realizing the fixed installation of the battery cell 2 and facilitating the fixed installation of different numbers of battery cells 2 inside the battery shell 1.

[0060] Subsequently, the operator places the battery cover 11 on the upper end surface of the battery housing 1, the return-shaped sealing gasket 59 enters the inner part of the return-shaped groove 591, and the four L-shaped locking plates 51 enter the inner part of the four L-shaped locking grooves 52. The L-shaped locking plates 51 fix the battery cover 11 to the upper end surface of the battery housing 1 through the L-shaped locking grooves 52, thereby conveniently achieving the sealing fixation of the battery cover 11. Compared with the existing technology of fixing the battery cover 11 by welding, it is convenient for subsequent operators to disassemble and maintain the battery core 2 in the battery housing 1;

[0061] During use, by pulling out the sealing plug 66 at the end of the liquid inlet pipe 64, the coolant is injected into a circular circulation pipe 61 through the liquid inlet pipe 64, and the coolant circulates in multiple circular circulation pipes 61 through the connecting pipe 63. At the same time, the coolant takes away the high-temperature airflow in the battery casing 1 and is discharged through the drain pipe 65, thereby conveniently realizing the heat dissipation of the battery core 2 and effectively improving the service life of the battery core 2.

[0062] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A lithium vanadium fluorophosphate lithium-ion battery positive electrode material, comprising a battery housing (1) and a plurality of battery cells (2), characterized in that: The battery core (2) is composed of a lithium vanadium fluorophosphate positive electrode sheet (21), a lithium vanadium fluorophosphate negative electrode sheet (22), and a diaphragm (23). A battery cover (11) is detachably mounted on the upper end surface of the battery housing (1). A fixing mechanism (3) for the battery core (2) is provided inside the battery housing (1). A sealing mechanism (5) is provided between the battery housing (1) and the battery cover (11). A heat dissipation mechanism (6) is also provided inside the battery housing (1).

2. A lithium vanadium fluorophosphate lithium-ion battery positive electrode material according to claim 1, characterized in that: The surface of the battery cover (11) is provided with a plurality of evenly distributed wiring slots (12).

3. A lithium vanadium fluorophosphate lithium ion battery positive electrode material according to claim 1, characterized in that: The fixing mechanism (3) includes a plurality of limit plates (31), a side wall of the battery housing (1) is provided with a plurality of evenly distributed chute grooves (33), an inner wall of the chute groove (33) is slidably mounted with a slider (34), one side of the slider (34) is fixedly connected to the limit plate (31), and a side wall of the battery housing (1) is rotatably mounted with a plurality of evenly distributed threaded rods (35), the threaded rods (35) pass through the chute grooves (33) and are threadedly rotatably connected to the slider (34), and one end of the threaded rod (35) is fixedly mounted with a first bevel gear (36).

4. A lithium vanadium fluorophosphate lithium ion battery positive electrode material according to claim 3, characterized in that: A plurality of evenly distributed rotating rods (37) are rotatably mounted inside the battery housing (1), a second bevel gear (38) is fixedly mounted on one end of the rotating rod (37), and one of the second bevel gears (38) is meshedly connected with two adjacent first bevel gears (36).

5. A lithium vanadium fluorophosphate lithium-ion battery positive electrode material according to claim 4, characterized in that: A worm gear (39) is fixedly mounted on one end of the rotating rod (37) away from the second bevel gear (38), and a plurality of evenly distributed worms (4) are rotatably mounted on both sides of the battery housing (1), and the worms (4) and the worm gear (39) are meshed and connected.

6. A lithium vanadium fluorophosphate lithium ion battery positive electrode material according to claim 5, characterized in that: The fixing mechanism (3) further comprises a plurality of first limiting plates (42) and a plurality of second limiting plates (43), wherein the first limiting plates (42) are fixedly mounted on the bottom wall of the battery housing (1), and the second limiting plates (43) are fixedly mounted on the lower surface of the battery cover (11).

7. A lithium vanadium fluorophosphate lithium-ion battery positive electrode material according to claim 6, characterized in that: A knob (41) is fixedly mounted on one end of the worm (4), a first protective pad (32) is fixedly mounted on one side of the limiting plate (31), a second protective pad (44) is fixedly mounted on one side of each of the first limiting plate (42) and the second limiting plate (43), and the second protective pad (44) is in movable contact with the upper and lower surfaces of the battery core (2).

8. The positive electrode material for lithium vanadium fluorophosphate lithium-ion battery according to claim 1, characterized in that: The sealing mechanism (5) comprises four L-shaped locking plates (51), L-shaped locking grooves (52) are provided on all sides of the battery housing (1), the inner walls of the L-shaped locking plates (51) and the L-shaped locking grooves (52) are movably plugged, the battery cover (11) is provided with notches (53) on all sides, a rotating shaft (54) is rotatably mounted on the inner wall of the notch (53), a connecting seat (55) is fixedly mounted on the middle of the rotating shaft (54), a connecting block (56) is fixedly mounted on the outer wall of the connecting seat (55), one end of the connecting block (56) and the L-shaped locking plate (51) are connected to each other. 1) Fixed connection, both ends of the rotating shaft (54) are sleeved with a torsion spring (58), one end of the torsion spring (58) is fixedly connected to the inner wall of the notch (53), the other end of the torsion spring (58) is fixedly connected to one end of the connecting seat (55), the outer wall of the connecting seat (55) is fixedly mounted with a toggle block (57), the lower surface of the battery cover (11) is fixedly mounted with a return-shaped sealing gasket (59), the upper surface of the battery housing (1) is provided with a return-shaped groove (591), and the return-shaped sealing gasket (59) is in movable contact with the inner wall of the return-shaped groove (591).

9. The positive electrode material for lithium vanadium fluorophosphate lithium-ion battery according to claim 1, characterized in that: The heat dissipation mechanism (6) includes a plurality of circular circulation pipes (61), the outer wall of the circular circulation pipe (61) is fixedly installed with evenly distributed support rods (62), one end of the support rod (62) away from the circular circulation pipe (61) is fixedly connected to the side wall of the battery housing (1), and a connecting pipe (63) is fixedly installed between the circular circulation pipes (61), one of the circular circulation pipes (61) is fixedly installed with a liquid inlet pipe (64), and the other circular circulation pipe (61) is fixedly installed with a liquid discharge pipe (65), and the ends of the liquid inlet pipe (64) and the liquid discharge pipe (65) away from the circular circulation pipe (61) are both movably connected with a sealing plug (66).

10. A method for synthesizing the lithium vanadium fluorophosphate lithium-ion battery cathode material according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Introducing a fixed amount of lithium vanadium phosphate fluoride and asphalt into a stirring tank of a stirring device, stirring the lithium vanadium phosphate fluoride and asphalt at a high speed of 1000-10000 rpm and a temperature of 20-25° C. to obtain a coating; S2. The obtained coated material is placed in a sintering furnace for high-temperature calcination. Inert gas is added during the calcination process. The inert gas is helium. The calcination temperature is 1200° C.-1500° C. After the calcination, lithium vanadium fluorophosphate lithium-ion battery positive electrode material is obtained.

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