Preparation device and preparation method of electrolyte for lithium battery production

Abstract

The invention discloses a preparation device and a preparation method of an electrolyte for lithium battery production, and relates to the technical field of lithium battery production, the preparation device comprises a preparation tank and a bearing plate slidably connected in the preparation tank, a driving motor is arranged at the lower end of the preparation tank, the output end of the driving motor penetrates through the bottom of the preparation tank and is connected with a stirring rod, and a through hole is formed in the bearing plate; a sliding groove is formed in the surface of the preparation tank, and a connecting rod is connected to the side surface of the bearing plate and slidably matched with the sliding groove. According to the preparation device and preparation method of the electrolyte for lithium battery production, the bearing plate capable of sliding in the preparation tank according to the weight of the solution is arranged for bearing the solution, and when the solution enters the preparation tank, the bearing plate is pressed downwards to slide downwards; when sliding, the driving assembly drives the stirring assembly to adjust the position so as to adapt to the volume of the solution for stirring, and synchronously drives the transmission assembly to move so as to drive the material distributing assembly to quantitatively add the lithium salt, so that a solvent in the solution and the lithium salt are properly proportioned, and the electrolyte with a proper proportion is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a device and method for preparing an electrolyte for lithium battery production. Background Art

[0002] Lithium battery electrolyte is one of the key materials of lithium-ion batteries and is known as the "blood" of the battery. It conducts ions between the positive and negative electrodes of the battery and plays a key role in the battery's energy density, power density, cycle life, safety performance, and wide temperature application.

[0003] Lithium battery electrolyte is generally made of high-purity organic solvents, electrolyte lithium salts, necessary additives and other raw materials, prepared under certain conditions and in a certain proportion, among which the solvent accounts for 80% to 85%, lithium salt accounts for 10% to 12%, and additives account for 3% to 5%.

[0004] When preparing the electrolyte, according to the formula of the electrolyte and the order of adding materials, the purified solvent, solute, additives and other raw materials are added to the preparation kettle and stirred and mixed thoroughly. The proportion of the raw materials can maximize the effect of the electrolyte. Therefore, when adding these raw materials to the electrolyte, it is very important to make the solvent and lithium salt in the electrolyte have a proper ratio and mix them thoroughly. Summary of the invention

[0005] The object of the present invention is to provide a device and method for preparing an electrolyte for lithium battery production, so as to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A preparation device for an electrolyte for lithium battery production, comprising a preparation tank and a bearing plate slidably connected to the inside of the preparation tank, wherein a driving motor is provided at the lower end of the preparation tank, an output end of the driving motor passes through the bottom of the preparation tank and is connected to a stirring rod, a through hole is provided on the bearing plate, a sliding groove is provided on the surface of the preparation tank, a connecting rod is connected to the side surface of the bearing plate, and the connecting rod is slidably matched with the sliding groove;

[0008] The stirring rod is connected to a stirring assembly through a through hole, the outer end of the connecting rod is connected to a transmission assembly, and a material distribution assembly is provided on the transmission assembly. When the load-bearing plate is pressed down and slides by the weight of the solution, the position of the stirring assembly is adjusted and the transmission assembly is synchronously driven to move, so as to drive the material distribution assembly to add lithium salt.

[0009] As a further preferred scheme in the embodiment of the present invention, the stirring assembly includes a sleeve rotatably connected to the upper surface of the load-bearing plate, and the sleeve is slidably sleeved on the surface of the stirring rod, and the upper end of the stirring rod is connected to a top pipe, and the surface of the sleeve is connected to a first connecting seat, and one end of the first connecting seat is rotatably connected to a first connecting rod, and the surface of the top pipe is connected to a second connecting seat, and one end of the second connecting seat is rotatably connected to a second connecting rod, and the first connecting rod and the second connecting rod are rotatably connected at the center, the stirring assembly also includes a stirring bar, and a mating groove is provided on one side surface of the stirring bar, and one end of the first connecting rod and one end of the second connecting rod are both rotatably connected to the mating groove.

[0010] As a further preferred scheme in the embodiment of the present invention, a grading groove is provided on the inner wall of the preparation tank, a rotating shaft is rotatably connected in the grading groove, a grading block is connected to the middle of the rotating shaft, a reset torsion spring is connected between the grading groove and the grading block, the reset torsion spring is arranged on the surface of the rotating shaft, and a matching inclined surface is provided on the upper surface of the grading block.

[0011] As a further preferred scheme in the embodiment of the present invention, a telescopic rod is provided on the lower surface of the load-bearing plate, a storage cylinder is slidably sleeved on the surface of the telescopic rod, a guide sealing ring is connected to the lower end of the telescopic rod, and the guide sealing ring is arranged at the top end of the storage cylinder. A first piston and a second piston are also slidably connected to the inside of the storage cylinder from top to bottom, and an inflation valve is provided at the lower end of the storage cylinder.

[0012] As a further preferred scheme in the embodiment of the present invention, the transmission assembly includes a lifting rod connected to the outer end of the connecting rod, and a transmission rod is sleeved on the surface of the lifting rod, and a transmission part is also fixedly connected to the surface of the lifting rod, and a multi-stage transmission groove is provided on the transmission rod, and the transmission part slides with the multi-stage transmission groove, and a half gear is connected to the top of the transmission rod, and a first mounting seat is connected to the lower end of the transmission rod, and a middle hole is provided on the first mounting seat, and the transmission rod slides with the middle hole, and the half gear is meshed with a full gear, and a transmission tube is connected to the upper surface of the full gear, and a second mounting seat is sleeved on the surface of the transmission tube.

[0013] As a further preferred scheme in the embodiment of the present invention, the material dividing assembly includes a connecting frame fixedly connected to the surface of the second mounting seat, and a material dividing ring is fixedly connected to the upper end of the connecting frame, and the lower surface of the material dividing ring is provided with connected material dividing inclined grooves and a material discharge groove, and the upper end of the transmission tube is fixedly connected to a material dividing plate.

[0014] As a further preferred scheme in the embodiment of the present invention, the material dividing assembly also includes a material dividing barrel connected to the lower surface of the material dividing plate, and the surface of the material dividing barrel is connected with a first connecting bar, and one end of the first connecting bar is rotatably connected with a second connecting bar, and one end of the second connecting bar is connected with a matching bar, and one end of the matching bar is connected with a material dividing cover, and the other end of the matching bar is slidably connected to the lower surface of the material dividing ring.

[0015] As a further preferred solution in the embodiment of the present invention, a sealing groove is respectively provided at the upper and lower ends of the sliding groove, a sealing strip is slidably connected in each of the two sealing grooves, and the connecting rod is arranged between the two sealing strips.

[0016] As a further preferred scheme in the embodiment of the present invention, the first mounting seat and the second mounting seat are both connected to the surface of the preparation tank, the upper surface of the preparation tank is connected with a liquid inlet and a material inlet, the lower surface of the preparation tank is fixedly connected with a support seat, the lower surface of the preparation tank is also provided with a liquid outlet valve, the load-bearing plate is provided with a liquid outlet hole, one end of the liquid outlet valve passes through the lower surface of the preparation tank and is connected with the liquid outlet hole, an external hole is provided on the dividing plate, the external material port is connected with the external hole, and the dividing barrel is adapted to the position of the material inlet.

[0017] A method for preparing an electrolyte for lithium battery production, prepared by the above-mentioned device for preparing an electrolyte for lithium battery production, comprises the following steps:

[0018] S1: Add solvent: add solvent dimethyl sulfoxide into the preparation tank through the liquid inlet;

[0019] S2: Mixing lithium salt: mixing lithium salt lithium difluorooxalate borate and additive fluoroethylene carbonate, and adding them into the dispensing barrel through the external material port;

[0020] S3: stirring the solution: starting the driving motor to drive the stirring component to move and stir the solution;

[0021] S4: Adjust stirring: The load-bearing plate is pressed down and slides by the weight of the solvent dimethyl sulfoxide, and the stirring assembly is adjusted synchronously to adjust its position to adapt to the volume of the solution;

[0022] S5: quantitatively distributing and adding lithium salt: the load-bearing plate synchronously drives the transmission component to move, so as to drive the distributing component to quantitatively add lithium salt lithium difluorooxalate borate into the preparation tank;

[0023] S6: Preparation completed: The solvent dimethyl sulfoxide and the lithium salt lithium difluorooxalate borate are stirred and mixed to prepare an electrolyte, and the liquid outlet valve is opened to discharge the electrolyte.

[0024] In the above technical scheme, the present invention provides a device and method for preparing an electrolyte for lithium battery production, which have the following beneficial effects:

[0025] The present invention provides a load-bearing plate that can slide in a preparation tank according to the weight of the solution to carry the solution. When the solution enters the preparation tank, the load-bearing plate is pressed down to make it slide downward. During the sliding, the stirring component is driven to adjust its position to adapt to the volume of the solution for stirring, and the transmission component is synchronously driven to move, so as to drive the material distribution component to add lithium salt quantitatively, so that the solvent and lithium salt in the solution are properly proportioned, and an electrolyte with a suitable ratio is obtained.

[0026] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0027] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the overall structure from another perspective provided by an embodiment of the present invention;

[0031] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at A in the middle;

[0032] Figure 4 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at B in the middle;

[0033] Figure 5 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at C in the middle;

[0034] Figure 6 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at D in the middle;

[0035] Figure 7 A schematic diagram of the internal structure of a preparation tank provided in an embodiment of the present invention;

[0036] Figure 8 The embodiment of the present invention provides Figure 7 The enlarged structural diagram at E in the middle;

[0037] Fig. 9 The embodiment of the present invention provides Figure 7 The enlarged structural diagram at F in the middle;

[0038] Fig.10 A schematic diagram of the internal structure of a storage tube provided in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 100, preparation tank; 101, liquid inlet; 102, material inlet; 103, support seat; 104, liquid outlet valve; 105, sliding groove; 106, sealing strip; 200, load-bearing plate; 201, driving motor; 202, stirring rod; 203, connecting rod; 300, sleeve; 301, first connecting seat; 302, first connecting rod; 303, top pipe; 304, second connecting seat; 305, second connecting rod; 306, stirring bar; 307, matching groove; 400, grading block; 401, matching inclined surface; 402, rotating shaft; 403, reset torsion spring; 500, telescopic rod; 501, storage tube ; 502, guide sealing ring; 503, first piston; 504, second piston; 505, inflation valve; 600, lifting rod; 601, transmission member; 602, transmission rod; 603, multi-stage transmission groove; 604, half gear; 605, first mounting seat; 700, full gear; 701, second mounting seat; 702, transmission pipe; 703, connecting frame; 704, dividing ring; 705, dividing inclined groove; 706, dividing plate; 707, external material port; 708, discharge trough; 800, dividing barrel; 801, dividing cover; 802, first connecting strip; 803, second connecting strip; 804, matching strip. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0042] See also Figure 1 - Fig.10, a preparation device for electrolyte for lithium battery production, comprising a preparation tank 100 and a bearing plate 200 slidably connected to the inside of the preparation tank 100, a driving motor 201 is provided at the lower end of the preparation tank 100, an output end of the driving motor 201 passes through the bottom of the preparation tank 100 and is connected to a stirring rod 202, a through hole is provided on the bearing plate 200, a sliding groove 105 is provided on the surface of the preparation tank 100, a connecting rod 203 is connected to the side surface of the bearing plate 200, and the connecting rod 203 is slidably matched with the sliding groove 105;

[0043] The stirring rod 202 is connected to a stirring assembly through a through hole, and the outer end of the connecting rod 203 is connected to a transmission assembly, on which a material distribution assembly is provided. When the load-bearing plate 200 slides downward under the weight of the solution, the position of the stirring assembly is adjusted, and the transmission assembly is synchronously driven to move, so as to drive the material distribution assembly to add lithium salt.

[0044] The present invention carries the solution by providing a load-bearing plate 200 that can slide in the preparation tank 100 according to the weight of the solution. When the solution enters the preparation tank 100, the load-bearing plate 200 is pressed down to make it slide downward. During the sliding, the stirring component is driven to adjust its position to adapt to the volume of the solution for stirring, and the transmission component is synchronously driven to move, so as to drive the material distribution component to add lithium salt quantitatively, so that the solvent and lithium salt in the solution are properly proportioned, and an electrolyte of a suitable proportion is obtained.

[0045] Furthermore, the preparation tank 100 is made of a transparent material, which is convenient for the staff to observe the internal conditions.

[0046] In an embodiment further provided by the present invention, the stirring assembly includes a sleeve 300 rotatably connected to the upper surface of the load-bearing plate 200, and the sleeve 300 is slidably sleeved on the surface of the stirring rod 202, and the upper end of the stirring rod 202 is connected to a top pipe 303, and the surface of the sleeve 300 is connected to a first connecting seat 301, and one end of the first connecting seat 301 is rotatably connected to the first connecting rod 302, and the surface of the top pipe 303 is connected to a second connecting seat 304, and one end of the second connecting seat 304 is rotatably connected to the second connecting rod 305, and the first connecting rod 302 and the second connecting rod 305 are rotatably connected at the center, the stirring assembly also includes a stirring bar 306, and a mating groove 307 is provided on one side surface of the stirring bar 306, and one end of the first connecting rod 302 and one end of the second connecting rod 305 are both rotatably connected to the mating groove 307.

[0047] Furthermore, the sleeve 300 is relatively fixed and rotatably connected to the upper surface of the load-bearing plate 200, and the sleeve 300 is relatively fixed and slidably connected to the stirring rod 202, that is, the stirring rod 202 can drive the sleeve 300 to rotate, and the sleeve 300 can slide on the stirring rod 202, and at the same time, the sleeve 300 rotates relative to the load-bearing plate 200, that is, when the sleeve 300 rotates, the load-bearing plate 200 will not rotate.

[0048] Specifically, when the load-bearing plate 200 slides downward, it drives the sleeve 300 to slide downward together, thereby driving the first connecting rod 302 on the first connecting seat 301 to rotate, and driving the second connecting rod 305 to rotate together under the action of the second connecting seat 304, so that the first connecting rod 302 and the second connecting rod 305 converge inward, so that the stirring bar 306 converges inward and is always in contact with the bottom of the solution, so as to increase the shear force of the solution, thereby improving the mixing efficiency while reducing the dead angle in the preparation tank 100, so as to increase the flow rate of the solution in the entire preparation tank 100.

[0049] In an embodiment further provided by the present invention, a grading groove is provided on the inner wall of the preparation tank 100, a rotating shaft 402 is rotatably connected in the grading groove, a grading block 400 is connected to the middle of the rotating shaft 402, a reset torsion spring 403 is connected between the grading groove and the grading block 400, the reset torsion spring 403 is arranged on the surface of the rotating shaft 402, and a matching inclined surface 401 is provided on the upper surface of the grading block 400.

[0050] Furthermore, there are four grading blocks 400, matching slopes 401, rotating shafts 402 and reset torsion springs 403, which are arranged in a circular equidistant array around the center point of the preparation tank 100, and the four grading blocks 400, matching slopes 401, rotating shafts 402 and reset torsion springs 403 in each plane are a group, and several groups are provided.

[0051] Furthermore, the lower surface of the grading block 400 is a horizontal plane. After the load-bearing plate 200 is pressed down, the horizontal plane abuts against the lower surface of the load-bearing plate 200. Under the dual action of the gravity of the solution, the load-bearing plate 200 maintains balance during stirring and does not cause leakage. After the electrolyte preparation is completed and the load-bearing plate 200 is reset, the reset torsion spring 403 drives the grading block 400 to reset as well.

[0052] Specifically, when the load-bearing plate 200 slides downward to the matching inclined surface 401, it drives the grading block 400 to rotate. At this time, the material dividing assembly is synchronously touched, that is, the movement of the grading block 400 is synchronous with the material dividing, that is, lithium salt is added once every time the load-bearing plate 200 passes through a level of the grading block 400, so that the staff can clearly observe how many times lithium salt has been added, and thus determine whether the proportion of the electrolyte is correct.

[0053] In an embodiment further provided by the present invention, a telescopic rod 500 is provided on the lower surface of the load-bearing plate 200, a storage tube 501 is slidably sleeved on the surface of the telescopic rod 500, a guide sealing ring 502 is connected to the lower end of the telescopic rod 500, the guide sealing ring 502 is arranged at the top end of the storage tube 501, a first piston 503 and a second piston 504 are also slidably connected from top to bottom inside the storage tube 501, and an inflation valve 505 is provided at the lower end of the storage tube 501.

[0054] Specifically, the inflation valve 505 is used to charge compressed gas, hydraulic oil is filled between the guide sealing ring 502 and the first piston 503 to form a first contraction chamber, and compressed gas is filled between the second piston 504 and the inner bottom surface of the storage tube 501 to form a second contraction chamber. Under the joint action of the first contraction chamber and the second contraction chamber, the load-bearing plate 200 descends smoothly and slowly, and after the electrolyte is discharged, the load-bearing plate 200 is reset to its initial position under the action of the internal pressure of the first contraction chamber and the second contraction chamber.

[0055] In an embodiment further provided by the present invention, the transmission assembly includes a lifting rod 600 connected to the outer end of the connecting rod 203, and a transmission rod 602 is sleeved on the surface of the lifting rod 600, and a transmission member 601 is also fixedly connected to the surface of the lifting rod 600, and a multi-stage transmission groove 603 is provided on the transmission rod 602, and the transmission member 601 slides with the multi-stage transmission groove 603, and a half gear 604 is connected to the top of the transmission rod 602, and a first mounting seat 605 is connected to the lower end of the transmission rod 602, and a middle hole is provided on the first mounting seat 605, and the transmission rod 602 slides with the middle hole, and the half gear 604 is meshed with a full gear 700, and a transmission tube 702 is connected to the upper surface of the full gear 700, and a second mounting seat 701 is sleeved on the surface of the transmission tube 702.

[0056] Furthermore, the multi-stage transmission groove 603 is a groove structure in which a plurality of spiral grooves are connected to each other, and the number of the spiral grooves is consistent with the number of groups of the grading blocks 400 .

[0057] In an embodiment further provided by the present invention, the material dividing assembly includes a connecting frame 703 fixedly connected to the surface of the second mounting seat 701, and a material dividing ring 704 is fixedly connected to the upper end of the connecting frame 703, and the lower surface of the material dividing ring 704 is provided with a connected material dividing inclined groove 705 and a material discharge groove 708, and the upper end of the transmission tube 702 is fixedly connected to a material dividing plate 706.

[0058] Furthermore, the side surface of the half gear 604 is only provided with a half circle of gear teeth, so that the dividing plate 706 can only rotate one hundred and eighty degrees each time.

[0059] Specifically, when the load-bearing plate 200 slides downward, the lifting rod 600 on the connecting rod 203 is driven down together, so that the transmission member 601 slides in the multi-stage transmission groove 603, and converts the lifting motion into rotational motion under the action of the multi-stage transmission groove 603, so that the transmission rod 602 rotates, so that the half gear 604 drives the full gear 700 to rotate, so as to drive the transmission tube 702 to rotate, thereby driving the dividing plate 706 to rotate.

[0060] In an embodiment further provided by the present invention, the material dividing assembly also includes a material dividing barrel 800 connected to the lower surface of the material dividing plate 706, and a first connecting bar 802 is connected to the surface of the material dividing barrel 800, and one end of the first connecting bar 802 is rotatably connected to the second connecting bar 803, and one end of the second connecting bar 803 is connected to a matching bar 804, and one end of the matching bar 804 is connected to a material dividing cover 801, and the other end of the matching bar 804 is slidably connected to the lower surface of the material dividing ring 704.

[0061] Furthermore, there are two material dividing assemblies, which are mirror-symmetrical about the center point of the material dividing plate 706 .

[0062] Specifically, when the dividing plate 706 rotates, it drives the matching strip 804 to slide along the lower surface of the dividing ring 704. When passing through the dividing inclined groove 705, one end of the matching strip 804 is lifted up, so that the second connecting strip 803 and the first connecting strip 802 rotate relative to each other, so that the dividing cover 801 opens, and the lithium salt in the dividing barrel 800 falls.

[0063] In an embodiment further provided by the present invention, a sealing groove is respectively provided at the upper and lower ends of the sliding groove 105 , a sealing strip 106 is slidably connected in each of the two sealing grooves, and the connecting rod 203 is disposed between the two sealing strips 106 .

[0064] Furthermore, a spring is connected between the inside of the sealing groove and the sealing strip 106 .

[0065] Specifically, when the connecting rod 203 slides downward, the upper sealing strip 106 moves downward together with the spring, thereby always pressing against the connecting rod 203 to form a seal, so that the solution will not leak.

[0066] In the embodiment further provided by the present invention, the first mounting seat 605 and the second mounting seat 701 are both connected to the surface of the preparation tank 100, the upper surface of the preparation tank 100 is connected with a liquid inlet 101 and a material inlet 102, the lower surface of the preparation tank 100 is fixedly connected with a support seat 103, the lower surface of the preparation tank 100 is also provided with a liquid outlet valve 104, the load-bearing plate 200 is provided with a liquid outlet hole, one end of the liquid outlet valve 104 passes through the lower surface of the preparation tank 100 and is connected with the liquid outlet hole, an external hole is provided on the dividing plate 706, the external material port 707 is connected with the external hole, and the dividing barrel 800 is adapted to the position of the material inlet 102.

[0067] Furthermore, the external material port 707 is connected to the external feeding equipment and is only communicated with the external hole but not connected, so that the lithium salt in the external material port 707 is sealed and will not leak when the dividing plate 706 rotates, and the lithium salt will not fall until it rotates to the external hole.

[0068] Specifically, lithium salt is added into the distribution barrel 800 through the external hole, and when the distribution plate 706 rotates, the distribution barrel 800 with added lithium salt is rotated to above the feed inlet 102 for addition, and at this time, another distribution barrel 800 is rotated to the external feed inlet 707 for feeding.

[0069] A method for preparing an electrolyte for lithium battery production, prepared by the above-mentioned device for preparing an electrolyte for lithium battery production, comprises the following steps:

[0070] S1: Adding solvent: adding solvent dimethyl sulfoxide into the preparation tank 100 through the liquid inlet 101;

[0071] S2: Mixing lithium salt: mixing lithium salt lithium difluorooxalate borate and additive fluoroethylene carbonate, and adding them into the distributing barrel 800 through the external material port 707;

[0072] S3: stirring the solution: starting the driving motor 201 to drive the stirring component to move and stir the solution;

[0073] S4: regulating stirring: the load-bearing plate 200 is pressed down and slid by the weight of the solvent dimethyl sulfoxide, and the regulating stirring component is synchronously adjusted to adapt to the volume of the solution;

[0074] S5: quantitatively dividing and adding lithium salt: the load-bearing plate 200 synchronously drives the transmission component to move, so as to drive the dividing component to quantitatively add the lithium salt lithium difluorooxalate borate into the preparation tank 100;

[0075] S6: Preparation completed: The solvent dimethyl sulfoxide and the lithium salt lithium difluorooxalate borate are stirred and mixed to prepare an electrolyte, and the liquid outlet valve 104 is opened to discharge the electrolyte.

[0076] In the present invention, firstly, the solvent dimethyl sulfoxide is added into the preparation tank 100 through the liquid inlet 101, and then the lithium salt lithium difluorooxalate borate is mixed with the additive fluoroethylene carbonate, and then added into the dispensing barrel 800 through the external material port 707, and the driving motor 201 is started to drive the stirring bar 306 to stir the solvent; when the solvent enters the preparation tank 100, the load-bearing plate 200 is pressed down to make it slide downward, and when the load-bearing plate 200 slides downward, the sleeve 300 is driven to slide downward together, so that the first connecting rod 302 and the second connecting rod 305 are converged inwardly, so that the stirring bar 306 is converged inwardly to adapt to the volume of the solvent for stirring; synchronously, when the load-bearing plate 200 slides downward, the lifting rod 600 on the connecting rod 203 is driven to descend together, so that the transmission member 601 is in the multi-stage It slides in the transmission groove 603, and converts the lifting motion into rotational motion under the action of the multi-stage transmission groove 603, so that the transmission rod 602 rotates, so that the half gear 604 drives the full gear 700 to rotate, so as to drive the transmission tube 702 to rotate, thereby driving the dividing plate 706 to rotate. When the dividing plate 706 rotates, it drives the matching strip 804 to slide along the lower surface of the dividing ring 704. When passing through the dividing inclined groove 705, one end of the matching strip 804 is tilted, so that the second connecting strip 803 and the first connecting strip 802 rotate relative to each other, so that the dividing cover 801 is opened, and the lithium salt in the dividing barrel 800 falls, so that the lithium salt is quantitatively added to the solvent for stirring and mixing, thereby preparing a suitable electrolyte; after the preparation is completed, open the liquid outlet valve 104 to discharge the electrolyte.

[0077] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for preparing electrolyte for lithium battery production, comprising a preparation tank (100) and a load-bearing plate (200) slidably connected to the inside of the preparation tank (100), characterized in that: A driving motor (201) is provided at the lower end of the preparation tank (100); an output end of the driving motor (201) passes through the bottom of the preparation tank (100) and is connected to a stirring rod (202); a through hole is provided on the bearing plate (200); a sliding groove (105) is provided on the surface of the preparation tank (100); a connecting rod (203) is connected to the side surface of the bearing plate (200); and the connecting rod (203) is slidably matched with the sliding groove (105); The stirring rod (202) is connected to a stirring assembly through a through hole, and the outer end of the connecting rod (203) is connected to a transmission assembly. A material distribution assembly is provided on the transmission assembly. When the load-bearing plate (200) is pressed down and slides by the weight of the solution, the position of the stirring assembly is adjusted and the transmission assembly is synchronously driven to move, so as to drive the material distribution assembly to add lithium salt.

2. The device for preparing electrolyte for lithium battery production according to claim 1, characterized in that: The stirring assembly comprises a sleeve (300) rotatably connected to the upper surface of the bearing plate (200), and the sleeve (300) is slidably sleeved on the surface of the stirring rod (202), and the upper end of the stirring rod (202) is connected to a top pipe (303), and the surface of the sleeve (300) is connected to a first connecting seat (301), and one end of the first connecting seat (301) is rotatably connected to the first connecting rod (302), and the surface of the top pipe (303) is connected to the first connecting rod (303). The stirring assembly further comprises a stirring bar (306), and a mating groove (307) is provided on one side surface of the stirring bar (306), and one end of the first connecting rod (302) and one end of the second connecting rod (305) are both rotatably connected to the mating groove (307).

3. The device for preparing electrolyte for lithium battery production according to claim 2, characterized in that: The inner wall of the preparation tank (100) is provided with a grading groove, a rotating shaft (402) is rotatably connected in the grading groove, a grading block (400) is connected to the middle of the rotating shaft (402), a reset torsion spring (403) is connected between the grading groove and the grading block (400), the reset torsion spring (403) is arranged on the surface of the rotating shaft (402), and a matching inclined surface (401) is arranged on the upper surface of the grading block (400).

4. The device for preparing electrolyte for lithium battery production according to claim 3, characterized in that: A telescopic rod (500) is provided on the lower surface of the load-bearing plate (200), a storage cylinder (501) is slidably sleeved on the surface of the telescopic rod (500), a guide sealing ring (502) is connected to the lower end of the telescopic rod (500), the guide sealing ring (502) is arranged at the top end of the storage cylinder (501), a first piston (503) and a second piston (504) are slidably connected from top to bottom inside the storage cylinder (501), and an inflation valve (505) is provided at the lower end of the storage cylinder (501).

5. The device for preparing electrolyte for lithium battery production according to claim 4, characterized in that: The transmission assembly comprises a lifting rod (600) connected to the outer end of the connecting rod (203), and a transmission rod (602) is sleeved on the surface of the lifting rod (600), and a transmission member (601) is fixedly connected to the surface of the lifting rod (600), and a multi-stage transmission groove (603) is provided on the transmission rod (602), and the transmission member (601) and the multi-stage transmission groove (603) are slidably matched, and a half gear (604) is connected to the top of the transmission rod (602), and a first mounting seat (605) is connected to the lower end of the transmission rod (602), and a middle hole is provided on the first mounting seat (605), and the transmission rod (602) and the middle hole are slidably matched, and the half gear (604) is meshed with a full gear (700), and a transmission pipe (702) is connected to the upper surface of the full gear (700), and a second mounting seat (701) is sleeved on the surface of the transmission pipe (702).

6. The device for preparing electrolyte for lithium battery production according to claim 5, characterized in that: The material distribution component includes a connecting frame (703) fixedly connected to the surface of the second mounting seat (701), and the upper end of the connecting frame (703) is fixedly connected to a material distribution ring (704), and the lower surface of the material distribution ring (704) is provided with a connected material distribution inclined groove (705) and a material discharge groove (708), and the upper end of the transmission tube (702) is fixedly connected to a material distribution plate (706).

7. The device for preparing electrolyte for lithium battery production according to claim 6, characterized in that: The material distributing assembly also includes a material distributing barrel (800) connected to the lower surface of the material distributing plate (706), and the surface of the material distributing barrel (800) is connected to a first connecting bar (802), and one end of the first connecting bar (802) is rotatably connected to a second connecting bar (803), and one end of the second connecting bar (803) is connected to a matching bar (804), and one end of the matching bar (804) is connected to a material distributing cover (801), and the other end of the matching bar (804) is slidably connected to the lower surface of the material distributing ring (704).

8. The device for preparing electrolyte for lithium battery production according to claim 7, characterized in that: The upper and lower ends of the sliding groove (105) are each provided with a sealing groove, and each of the two sealing grooves is slidably connected with a sealing strip (106), and the connecting rod (203) is arranged between the two sealing strips (106).

9. The device for preparing electrolyte for lithium battery production according to claim 8, characterized in that: The first mounting seat (605) and the second mounting seat (701) are both connected to the surface of the preparation tank (100); the upper surface of the preparation tank (100) is connected to a liquid inlet (101) and a material inlet (102); the lower surface of the preparation tank (100) is fixedly connected to a support seat (103); the lower surface of the preparation tank (100) is also provided with a liquid outlet valve (104); the load-bearing plate (200) is provided with a liquid outlet hole; one end of the liquid outlet valve (104) passes through the lower surface of the preparation tank (100) and is connected to the liquid outlet hole; the dividing plate (706) is provided with an external hole; the external material inlet (707) is connected to the external hole; and the dividing barrel (800) is adapted to the position of the material inlet (102).

10. A method for preparing an electrolyte for lithium battery production, characterized in that: The method is prepared by the preparation device for the electrolyte for lithium battery production according to any one of claims 1 to 9, characterized in that it comprises the following steps: S1: Adding solvent: adding solvent dimethyl sulfoxide into the preparation tank (100) through the liquid inlet (101); S2: Mixing lithium salt: mixing lithium salt lithium difluorooxalate borate and additive fluoroethylene carbonate, and adding them into the distributing barrel (800) through the external material port (707); S3: stirring the solution: starting the driving motor (201) to drive the stirring component to move and stir the solution; S4: regulating stirring: the bearing plate (200) is pressed down and slid by the weight of the solvent dimethyl sulfoxide, and the regulating stirring assembly is synchronously adjusted to adapt to the volume of the solution; S5: quantitatively adding lithium salt: the load-bearing plate (200) synchronously drives the transmission component to move, so as to drive the material-distributing component to quantitatively add the lithium salt lithium difluorooxalate borate into the preparation tank (100); S6: Preparation completed: The solvent dimethyl sulfoxide and the lithium salt lithium difluorooxalate borate are stirred and mixed to prepare an electrolyte, and the liquid outlet valve (104) is opened to discharge the electrolyte.

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