CN114976268A - Preparation facilities of electrolyte for lithium cell production - Google Patents

Abstract

The invention relates to a preparation device of electrolyte for lithium battery production, which comprises a reactor, wherein at least four levels of overflow grids are arranged in the reactor in sequence, reaction channels are arranged between two adjacent overflow grids, between the overflow grids and the front side wall of the reactor, and between the overflow grids and the rear side wall of the reactor, a cooling jacket is arranged on the outer side of the side wall of the reactor, a cooling cavity is arranged in the overflow grids, the top of the overflow grids is an overflow surface which inclines downwards from front to back, and the front level overflow grids are higher than the rear level overflow grids; the wall of the reactor is provided with at least three lithium salt charging openings, the lithium salt charging openings correspond to the overflow surfaces, the reaction channel is internally provided with a stirring shaft, the outer side of the stirring shaft is provided with stirring blades, and the outer side of the reactor is provided with a driving mechanism for driving the stirring shaft to rotate. According to the invention, the lithium salt is added on the solvent flow path in a small amount for multiple times, the cooling area of the solvent is large, the dissolution is complete, and the production efficiency is improved while the cooling effect is ensured.

Description

Preparation facilities of electrolyte for lithium cell production

Technical Field

The invention relates to the technical field of electrolyte production equipment, in particular to a preparation device of electrolyte for lithium battery production.

Background

The electrolyte of the lithium battery is a carrier for ion transmission in the lithium battery, plays a role in conducting ions between the positive electrode and the negative electrode of the lithium battery, and is a guarantee for the lithium battery to obtain the advantages of high voltage, high specific energy and the like. When the lithium battery electrolyte is prepared, the lithium battery electrolyte is generally prepared from electrolyte lithium salt (lithium hexafluorophosphate and the like), an organic solvent, necessary additives and other raw materials, a large amount of heat is generated when the lithium hexafluorophosphate is dissolved in the organic solvent, and the lithium hexafluorophosphate is in the characteristics that the lithium hexafluorophosphate is poor in thermal stability and easy to decompose when the temperature is high.

Disclosure of Invention

The invention aims to provide a preparation device of electrolyte for lithium battery production, which can solve the technical problem that the production efficiency is low due to the limitation of cooling capacity in the traditional preparation of the electrolyte of a lithium battery.

The invention provides the following technical scheme: a preparation device of electrolyte for lithium battery production comprises a reactor which is integrally of a box structure, wherein the lower side of the front side wall and the lower side of the rear side wall of the reactor are respectively provided with an organic solvent inlet and a mixed solution outlet, at least four stages of overflow grids are sequentially arranged between the organic solvent inlet and the mixed solution outlet in the reactor, the lower ends of the overflow grids are fixed at the bottom of the reactor, the two ends of each overflow grid are connected with the left side wall and the right side wall of the reactor, reaction channels for solvent to pass through are arranged between every two adjacent overflow grids, between the overflow grids and the front side wall of the reactor and between the overflow grids and the rear side wall of the reactor, the outer side of the reactor is provided with a cooling jacket, a cooling cavity for accommodating a cooling medium is arranged in each overflow grid, the top of each overflow grid is an overflow surface which inclines downwards from front to back, and the overflow grid of the front stage is higher than the overflow grid of the rear stage; be equipped with at least three lithium salt charge door on the reactor roof, the lithium salt charge door corresponds the overflow face setting, the inside (mixing) shaft that is equipped with of reaction channel, (mixing) shaft outside is equipped with stirring vane, and the reactor outside is equipped with and is used for driving (mixing) shaft pivoted actuating mechanism, and (mixing) shaft one end is stretched out the reactor outside and is connected with the actuating mechanism transmission.

Has the advantages that: when the lithium salt cooling device is used for preparing electrolyte, an organic solvent enters the reactor through the organic solvent inlet, sequentially overflows all overflow grids from front to back after the liquid level rises and passes through all reaction channels, on one hand, the internal structure greatly prolongs the flow path of the organic solvent, a cooling cavity is arranged in each overflow grid, a cooling jacket is arranged on the outer side of the side wall of the reactor, the heat exchange area is large, the organic solvent can be fully contacted and cooled on a longer flow path, the cooling effect is good, on the other hand, lithium salt is added into the organic solvent in a small amount and multiple times through a plurality of lithium salt charging openings, the heat can be fully released, the product quality is stable, and meanwhile, the higher production efficiency is ensured; the top of the overflow grid is an inclined downward overflow surface to form an inclined flow guide effect, so that the organic solvent can be prevented from reversely flowing. The stirring shaft arranged in the reaction channel can accelerate the dissolution of the organic solvent and the lithium salt, and can also prevent the lithium salt from caking and sinking after entering the solvent, so that the full dissolution of the organic solvent and the lithium salt is ensured, and the quality of the produced electrolyte is favorably improved.

Further, the overflow check keep off and are equipped with the level four, the lithium salt charge door is equipped with threely and keeps off the one-to-one setting with the tertiary overflow check of front side respectively, and the (mixing) shaft is equipped with threely and stretches into respectively and is located in the three reaction channel between the adjacent overflow check keep off.

Has the advantages that: the most front and the last reaction channels are not provided with stirring shafts and are only used as solution inlet and outlet channels, organic solvent flows out of the reactor through the last reaction channel sequentially in three times of 'salt adding-stirring mixing process' in the front-back overflow process, the overflow barrier is reasonably distributed with the lithium salt charging port and the stirring shafts, and the manufacturing cost and the running energy consumption are saved on the basis of improving the production efficiency and the product quality.

Further, drive mechanism includes sprocket, driven sprocket in the middle of driving motor, driving sprocket, first middle sprocket, the second, and driving motor links firmly with the reactor outside, and the driving motor output and rear side (mixing) shaft are connected, and driving sprocket sets up on rear side (mixing) shaft, and sprocket setting is in the middle of first middle sprocket, the second on the middle (mixing) shaft, and driven sprocket is located foremost on the (mixing) shaft, between driving sprocket and the first middle sprocket, through chain drive between driven sprocket and the second middle sprocket respectively.

Has the advantages that: the three stirring shafts are indirectly or directly driven by the same driving motor, so that the equipment cost is saved.

Furthermore, the preparation device of the electrolyte for lithium battery production further comprises a lithium salt pretreatment tank, a salt storage container and a conveying mechanism, wherein the lithium salt pretreatment tank comprises a tank body and a grinding mechanism, a screen and a vibrating mechanism, which are positioned in the tank body, a feed hopper is arranged on the tank body, a salt inlet is formed in the upper end of the feed hopper, a salt outlet is formed in the lower end of the feed hopper, the grinding mechanism comprises a pair of horizontally arranged grinding rollers, a grinding motor for driving the two grinding rollers to rotate oppositely is arranged outside the tank body, a grinding channel for crushing and grinding the lithium salt and allowing the lithium salt to pass through is arranged between the two grinding rollers, and the salt outlet of the feed hopper is arranged above the grinding channel;

the screen is arranged below the grinding channel, an installation bin and a secondary bin which protrude outwards are respectively arranged on the two horizontally opposite sides of the lower side of the tank body, two ends of the screen respectively extend into the installation bin and the secondary bin, one end of the screen is rotatably connected with the bottom wall of the secondary bin and is a connecting end, the upper side and the lower side of the other end of the screen are respectively connected with the installation bin through springs and are movable ends, the connecting end of the screen is lower than the movable end, and an included angle between the screen and the horizontal plane is between 20 degrees and 30 degrees; the vibrating mechanism is positioned in the mounting bin, is used for driving the movable end of the screen to rotate relative to the connecting end, and comprises a cam positioned on the upper side or the lower side of the screen, and a vibrating motor used for driving the cam to rotate is arranged outside the tank body; the salt storage container is positioned below the tank body, a lithium salt powder discharge port communicated with the salt storage container is arranged below the screen at the bottom of the tank body, and the conveying mechanism is used for conveying lithium salt in the salt storage container to the lithium salt charging port.

Has the advantages that: the lithium salt probably exists because of reasons such as the quality level is uneven or deposit improper and lead to the solid caking, sets up lithium salt preliminary treatment jar, storage salt container, conveying mechanism and realizes grinding screening, transition storage and the transportation process to the lithium salt in proper order, stably supplies the lithium salt that quality, size meet the requirements in the reactor, in lithium salt preliminary treatment jar: lithium salt passes through the feeder hopper and gets into jar internal portion, fall to grinding mechanism department, grind through grinding the passageway after the breakage through grinding mechanism, fall to the screen cloth of slope on, because the cam rotates the in-process intermittent type and pushes away the relative link rotation of screen cloth expansion end, can realize reciprocal vibrations from top to bottom of screen cloth under cam top pushing and spring reset effect, pulverous lithium salt gets into through the screen cloth and stores up the inside transportation of waiting on next step of salt container, it is cubic, graininess lithium salt then is screened out and glides along the slope screen cloth, store in the inside processing on next step of waiting of secondary feed bin, synthesize above process, the lithium salt receives abundant grinding screening before the pay-off gets into the reactor, be favorable to accelerating reaction dissolution rate, improve the product quality.

Further, the conveying mechanism is a screw conveyer, a feed inlet of the screw conveyer is communicated with the salt storage container, and a discharge outlet of the screw conveyer is connected with a lithium salt feed inlet.

Has the advantages that: the screw conveyer is stable in material conveying and can ensure that lithium salt is not contacted with the outside in the conveying process, and pollution is reduced.

Drawings

FIG. 1 is a schematic view showing the construction of an embodiment 1 of an apparatus for producing an electrolyte for lithium battery according to the present invention;

FIG. 2 is a schematic view of a detail at A in FIG. 1;

reference numerals: 1-a solvent storage tank; 2-a reactor; 3-lithium salt pretreatment tank; 4-a salt storage container; 5-a conveying mechanism; 6-solvent line; 7-a delivery pump; 8-an electromagnetic valve; 9-an organic solvent inlet; 10-mixed solution outlet; 11-a lithium salt charging port; 12-overflow grid; 13-overflow surface; 14-a cooling chamber; 15-stirring shaft; 16-stirring blades; 17-a drive motor; 18-grinding roll; 19-grinding the channel; 20-a screen mesh; 21-installing a bin; 22-a cam; 23-a secondary storage bin; 24-lithium salt powder discharge port; 25-a feed hopper; 26-a material guide plate; 27-a spring; 28-a reaction channel; 29-tank body.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

The specific embodiment 1 of the apparatus for preparing an electrolyte for lithium battery production of the present invention:

the overall structure of the preparation device of the electrolyte for lithium battery production is shown in figure 1, and specifically comprises a solvent liquid storage tank 1, a reactor 2, a lithium salt pretreatment tank 3, a salt storage container 4 and a conveying mechanism 5. Solvent liquid storage pot 1 is used for holding, storing organic solvent, and reactor 2 is used for carrying out dissolving of organic solvent and lithium salt, and reactor 2 is whole to be box structure, and its preceding lateral wall downside, back lateral wall downside are equipped with organic solvent import 9 and mixed solution export 10 respectively, and solvent liquid storage pot 1 supplies with organic solvent to reactor 2 through solvent pipeline 6, is equipped with delivery pump 7 on the solvent pipeline 6 and is used for the solenoid valve 8 of regulated flow. A cooling jacket is arranged on the outer side of the reactor 2, four overflow grid baffles 12 are sequentially arranged between the organic solvent inlet 9 and the mixed solution outlet 10 in the reactor, and in order to achieve the effect of gradually overflowing the solvent backwards, the heights of the four overflow grid baffles 12 are gradually reduced from front to back, namely the front overflow grid baffle is higher than the rear overflow grid baffle; reaction channels 28 are arranged between the overflow grids 12 and the front side wall of the reactor, between two adjacent overflow grids 12 and between the overflow grids 12 and the rear side wall of the reactor, in the embodiment, the total number of the reaction channels 28 is five, and the front-rear distance of the reaction channels 28 is gradually increased from front to rear.

The lower end of the overflow grid 12 is fixed at the bottom of the reactor, and the two ends of the overflow grid are respectively connected with the left side wall and the right side wall of the reactor 1, so that the solvent can only pass through the upper part of the overflow grid 12. The inner part of the overflow grid baffle 12 is provided with a cooling cavity 14 for containing a cooling medium, the cooling cavity 14 and a cooling jacket outside the reactor are circularly connected with an external cooling medium source, the top of the overflow grid baffle 12 is provided with an overflow surface 13 which inclines downwards from front to back, and the overflow surface 13 is arranged to prevent a solvent from flowing backwards and flowing backwards to a certain degree. Three lithium salt charge door 11 are equipped with on the reactor roof 1, and three lithium salt charge door 11 sets up with preceding three overflow check fender 12 one-to-one respectively, is located the top of three overflow face. For make the lithium salt add the back fully dissolve fast, prevent the formation of caking deposit with organic solvent, the inside (mixing) shaft 15 that is equipped with of three reaction channel 28 in the middle, the upper and lower both ends of (mixing) shaft 15 rotate with 1 roof, diapire of reactor respectively and are connected, are equipped with stirring vane 16 on the (mixing) shaft 15, and every lithium salt charge door 11's rear side all is equipped with (mixing) shaft 15, and the stirring is comparatively abundant.

The outside of reactor 1 is equipped with and is used for driving (mixing) shaft 15 pivoted actuating mechanism, actuating mechanism mainly comprises driving motor 17, driving sprocket, first middle sprocket, second middle sprocket, driven sprocket, driving motor 17 links firmly with the upside of reactor 1, its output shaft sets up down, is connected with the (mixing) shaft 15 of rearmost side, driving sprocket sets up on the (mixing) shaft 15 of rearmost side, first middle sprocket, second middle sprocket sets up on (mixing) shaft 15 of centre, driven sprocket is located the (mixing) shaft 15 of foremost side. The driving chain wheel and the first middle chain wheel and the driven chain wheel and the second middle chain wheel are respectively in chain transmission, so that the three stirring shafts 15 are indirectly/directly driven by the driving motor 17, and the equipment cost and the operation energy consumption are saved.

Lithium salt preliminary treatment jar 3 is used for grinding the screening to the lithium salt, reduce or eliminate the lithium salt because of quality factor or deposit improper harmful effects that lead to the caking to produce electrolyte quality, lithium salt preliminary treatment jar 3 detail structure is shown in fig. 2, jar body 29 including the outside and be located jar grinding mechanism in 29, the screen cloth, vibrations mechanism, jar body 29 top is equipped with feeder hopper 25, the upper and lower both ends of feeder hopper 25 are equipped with into salt mouth and salt outlet respectively, grinding mechanism is located feeder hopper 25 below, including a pair of side by side and the horizontal grinding roll 18 that sets up, jar body 29 outside is equipped with and is used for driving two grinding rolls pivoted grinding motor in opposite directions, the interval between two grinding rolls 18 constitutes the grinding passageway 19 that carries out broken grinding and supply the lithium salt to pass through to the lithium salt, the salt outlet of feeder hopper 25 is located grinding passageway 19 directly over. The screen 20 is positioned below the grinding mechanism, the two horizontally opposite sides of the lower side of the tank body 29 are respectively provided with an installation bin 21 and a secondary material bin 23 which protrude outwards, the screen 20 is provided with a plurality of screen holes for screening the ground lithium salt, two ends of the screen 20 respectively extend into the installation bin 21 and the secondary material bin 23, and one end of the screen 20 is rotatably connected with the bottom wall of the installation bin 21 and is a connecting end; the upper side and the lower side of the other end of the screen mesh 20 are respectively connected with the mounting bin 21 through springs 27 and are movable ends. The vibrating mechanism is arranged in the installation bin 21 and is used for driving the movable end of the screen mesh 20 to move relative to the connecting end, the vibrating mechanism is mainly composed of a cam 22, and a vibrating motor used for driving the cam 22 to rotate is arranged outside the tank body. 20 links of screen cloth are less than the expansion end, and the contained angle between screen cloth and the horizontal plane is in between 20 degrees and 30 degrees to make the lithium salt can be at the action of gravity slow downstream, the powder lithium salt passes through the sieve mesh, inside graininess, cubic lithium salt then got into inferior feed bin 23 along the screen cloth slant downwards, the bottom of inferior feed bin 23 was equipped with the inferior material opening, conveniently takes out jumbo size lithium salt and carries out further grinding.

In this embodiment, two material guiding plates 26 are disposed between the screen 20 and the grinding mechanism, and the distance between the two material guiding plates 26 is gradually decreased from top to bottom, so as to achieve the effects of preventing the powder from flying randomly and guiding the lithium salt to move toward the screen 20. The bottom of the tank body 29 is provided with a lithium salt powder discharge port 24, the salt storage container 4 is positioned below the tank body, and the tank body 29 is communicated with the salt storage container 4 through the lithium salt powder discharge port 24. The ground and screened lithium salts in powder form are stored in the salt storage container 4. The conveying mechanism 5 is a screw conveyer, the feeding end and the discharging end of the screw conveyer are respectively connected with the salt storage container 4 and the lithium salt charging port 11 on the reactor 1, and the lithium salt is stably supplied to the reactor 1 on the basis that the lithium salt is not in contact with the outside air.

When the preparation device of the electrolyte for producing the lithium battery is used for preparing the electrolyte of the lithium battery, the organic solvent enters the reactor through the organic solvent inlet, and as the inlet liquid is increased, the organic solvent sequentially overflows the overflow grid blocks 12 at each stage from front to back and flows through each reaction channel 28, in this in-process, add the lithium salt respectively to organic solvent in through three lithium salt charge door 11, the stirring effect that can both receive (mixing) shaft 15 after adding salt at every turn fully dissolves, in the structure setting of reactor, organic solvent can be at the cooling jacket, the effect of cooling medium fully cools off under the overflow check keeps off, the circulation path is long, cooling area is big, supplementary salt with a small amount of a lot of, effectively guarantee organic solvent and add the quick heat dissipation of salt in-process, avoid the temperature risees to lead to the lithium salt to appear decomposing, increase of production when guaranteeing product quality, production efficiency obtains promoting. The grinding and screening process is arranged on the front side of the reaction, so that the grinding and screening process is considered comprehensively, adverse factors which easily generate negative effects on the product quality in the process are reduced or eliminated, and the product quality is further improved.

The specific embodiment 2 of the device for preparing the electrolyte for lithium battery production of the present invention:

the difference with embodiment 1 lies in, overflow check keep off and be equipped with five, lithium salt feed inlet and (mixing) shaft all are equipped with four, and four lithium salt feed inlets set up respectively in the top of four overflow check fender in the front, and the (mixing) shaft is located four reaction channel insides in the middle of respectively.

The specific embodiment 3 of the apparatus for preparing an electrolyte for lithium battery production of the present invention:

the difference from embodiment 1 is that the cam is located on the upper side of the screen.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (5)

1. A preparation device of electrolyte for lithium battery production is characterized by comprising a reactor which is integrally of a box structure, wherein the lower sides of the front side wall and the rear side wall of the reactor are respectively provided with an organic solvent inlet and a mixed solution outlet, at least four stages of overflow grids are sequentially arranged between the organic solvent inlet and the mixed solution outlet in the reactor, the lower ends of the overflow grids are fixed at the bottom of the reactor, two ends of each overflow grid are connected with the left side wall and the right side wall of the reactor, reaction channels for solvent to pass through are arranged between every two adjacent overflow grids, between the overflow grids and the front side wall of the reactor, and between the overflow grids and the rear side wall of the reactor, the outer side of the reactor is provided with a cooling jacket, a cooling cavity for accommodating a cooling medium is arranged in each overflow grid, the top of each overflow surface inclines downwards from front to back, and the overflow grid of the front stage is higher than the overflow grid of the rear stage; be equipped with at least three lithium salt charge door on the reactor roof, the lithium salt charge door corresponds the overflow surface setting, the inside (mixing) shaft that is equipped with of reaction channel, the (mixing) shaft outside is equipped with stirring vane, and the reactor outside is equipped with and is used for driving (mixing) shaft pivoted actuating mechanism, and (mixing) shaft one end is stretched out the reactor outside and is connected with the actuating mechanism transmission.

2. The apparatus of claim 1, wherein the overflow barrier has four stages, the lithium salt charging port has three stages and is disposed in one-to-one correspondence with the front-side three-stage overflow barrier, and the stirring shaft has three stages and extends into the three reaction channels between the adjacent overflow barriers.

3. The apparatus of claim 2, wherein the driving mechanism comprises a driving motor, a driving sprocket, a first intermediate sprocket, a second intermediate sprocket, and a driven sprocket, the driving motor is fixedly connected to the outside of the reactor, the output end of the driving motor is connected to the rear-most stirring shaft, the driving sprocket is disposed on the rear-most stirring shaft, the first intermediate sprocket and the second intermediate sprocket are disposed on the intermediate stirring shaft, the driven sprocket is disposed on the front-most stirring shaft, and the driving sprocket and the first intermediate sprocket, and the driven sprocket and the second intermediate sprocket are respectively driven by chains.

4. The apparatus according to claim 1, 2 or 3, further comprising a lithium salt pretreatment tank, a salt storage container and a transportation mechanism, wherein the lithium salt pretreatment tank comprises a tank body, and a grinding mechanism, a screen and a vibration mechanism which are arranged in the tank body, the tank body is provided with a feed hopper, the upper end of the feed hopper is provided with a salt inlet, the lower end of the feed hopper is provided with a salt outlet, the grinding mechanism comprises a pair of horizontally arranged grinding rollers, the outer part of the tank body is provided with a grinding motor for driving the two grinding rollers to rotate in opposite directions, a grinding channel for crushing and grinding lithium salt and allowing the lithium salt to pass through is arranged between the two grinding rollers, and the salt outlet of the feed hopper is arranged above the grinding channel;

the screen is arranged below the grinding channel, an installation bin and a secondary bin which protrude outwards are respectively arranged on the two horizontally opposite sides of the lower side of the tank body, two ends of the screen respectively extend into the installation bin and the secondary bin, one end of the screen is rotatably connected with the bottom wall of the secondary bin and is a connecting end, the upper side and the lower side of the other end of the screen are respectively connected with the installation bin through springs and are movable ends, the connecting end of the screen is lower than the movable end, and an included angle between the screen and the horizontal plane is between 20 degrees and 30 degrees; the vibrating mechanism is positioned in the mounting bin, is used for driving the movable end of the screen to rotate relative to the connecting end, and comprises a cam positioned on the upper side or the lower side of the screen, and a vibrating motor used for driving the cam to rotate is arranged outside the tank body; the salt storage container is positioned below the tank body, a lithium salt powder discharge port communicated with the salt storage container is arranged below the screen at the bottom of the tank body, and the conveying mechanism is used for conveying lithium salt in the salt storage container to the lithium salt charging port.

5. The apparatus of claim 4, wherein the feeding mechanism is a screw conveyor, the feeding port of the screw conveyor is connected to the salt storage container, and the discharging port of the screw conveyor is connected to the lithium salt feeding port.

Images