CN215512364U - Negative pole piece preparation system device - Google Patents
Negative pole piece preparation system device Download PDFInfo
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- CN215512364U CN215512364U CN202120999374.4U CN202120999374U CN215512364U CN 215512364 U CN215512364 U CN 215512364U CN 202120999374 U CN202120999374 U CN 202120999374U CN 215512364 U CN215512364 U CN 215512364U
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- 238000002360 preparation method Methods 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 114
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 114
- 238000004140 cleaning Methods 0.000 claims abstract description 48
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000003792 electrolyte Substances 0.000 claims abstract description 40
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 238000001035 drying Methods 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000006835 compression Effects 0.000 claims description 30
- 238000007906 compression Methods 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 15
- 241000270295 Serpentes Species 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 7
- 239000012459 cleaning agent Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 abstract description 19
- 239000002904 solvent Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 13
- 230000001105 regulatory effect Effects 0.000 description 8
- 238000002604 ultrasonography Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000006138 lithiation reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007086 side reaction Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a negative pole piece preparation system device, which comprises a lithium coating device, a cleaning device and a drying device which are sequentially arranged along the pole piece processing direction; the negative pole piece sequentially bypasses the feeding conductive roller and the guide roller to be immersed in the electrolyte to be coated with lithium, the negative pole piece enters the cleaning device to be cleaned under the ultrasonic and heating conditions after being coated with the lithium, and the cleaned negative pole piece enters the drying device to be dried under the pressing condition of the pressing roller set. According to the utility model, the lithium is coated electrochemically, the lithium coating uniformity and temperature are ensured, and the residual electrolyte and solvent on the pole piece can be removed rapidly through the cleaning device and the drying device.
Description
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a negative pole piece preparation system device.
Background
With the popularization of lithium ion batteries in the fields of electronic equipment and electric automobiles, people have higher and higher requirements on lithium ion batteries. The energy density is one of the most important performance indexes of the lithium ion battery, and the improvement of the energy density means that electric equipment has stronger cruising ability, and is the key point of the research in the field of the lithium ion battery at present. The most direct method for improving the energy density is to select the positive and negative active materials with higher capacity, but the energy storage materials with high capacity, such as silicon-based and tin-based negative materials, are often accompanied by the problems of high irreversible capacity and low first charge-discharge efficiency, and have great influence on the cycle life of the battery cell.
Prelithiation is an effective way to increase the first efficiency of high capacity anode materials. Currently, the common prelithiation process is realized by electrochemical prelithiation, positive electrode lithium supplement, and negative electrode lithium supplement. Electrochemical prelithiation has the advantages of high controllability and uniform lithiation, but the large-scale application of the electrochemical prelithiation is limited by complex process, harsh conditions and high cost. And the cathode pole piece soaked with the electrolyte needs to be cleaned and dried, and the attached electrolyte and the solvent are removed.
CN111162246A discloses a continuous controllable effective lithiation system in advance and a lithium supplementing method, wherein the lithiation system in advance comprises an unreeling device, a negative pressure indirect lithiation device, a cleaning device, a drying device, a rolling device and a reeling device. The lithium supplementing method comprises the following steps: firstly, a layer of resistance buffer film is coated on a metal lithium ingot, a continuous pole piece is in indirect contact with the metal lithium ingot coated with the resistance buffer film in the presence of electrolyte through a negative pressure indirect buffer device, and pre-lithiation of an electrode is realized. But still has the problem of difficulty in cleaning.
CN112701253A discloses a prelithiation composite negative plate and a preparation method and application thereof, wherein the preparation method of the prelithiation composite negative plate comprises the following steps: prepressing the negative pole piece, the lithium foil and the release film to obtain a composite semi-finished product; the negative pole piece is positioned between two lithium foils, and the two lithium foils are positioned between two release films; and rolling the obtained composite semi-finished product to obtain the pre-lithiation composite negative plate. The method of pre-lithium by calendering has problems of non-uniform and unstable lithium coating.
CN210576212U discloses a prelithiation device for a silicon-based negative electrode plate of a lithium ion battery, which comprises a battery plate, a power machine, a lower roller coated by a metal lithium layer, an upper roller, a cleaning tank, an unwinding mechanism and a winding mechanism. The device carries out direct prelithiation process with electrode slice and metal lithium stick direct contact, and accessible changes contact pressure, contact time isoparametric change prelithiation degree. The pole piece is still coated with lithium by pressing a lithium material, and the problems of non-uniform and unstable lithium coating exist.
The existing lithium-coating devices have the problems of complex structure, uneven lithium coating, unstable lithium coating and the like, so how to quickly clean and dry electrolyte and solvent remained on a pole piece after lithium coating under the condition of ensuring that the lithium-coating device has a simple structure becomes a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a negative pole piece preparation system device, wherein a negative pole piece is electrically connected with a lithium source through a feeding conductive roller to form a primary battery for lithium coating, ultrasonic heating cleaning and drying are sequentially carried out after the lithium coating, the residual electrolyte and solvent on the pole piece can be quickly removed, and the device has the characteristics of simple structure, good lithium coating effect, high production efficiency and the like.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a negative pole piece preparation system device, which comprises a lithium coating device, a cleaning device and a drying device which are sequentially arranged along the pole piece processing direction; the lithium coating device comprises a shell injected with electrolyte, at least one guide roller is arranged in the shell, a lithium source immersed in the electrolyte is also arranged in the shell, a feeding conductive roller is arranged at the feeding end of the shell and is electrically connected with the lithium source, a current regulator is arranged on a circuit of the feeding conductive roller and the lithium source, a negative pole piece bypasses the feeding conductive roller and the guide roller and is immersed in the electrolyte, and the negative pole piece is electrically connected with the lithium source through the feeding conductive roller for lithium coating; the cleaning device comprises a cleaning tank filled with a cleaning agent, and an ultrasonic generator and a heater are arranged in the cleaning tank; the drying device comprises an oven, at least one compression roller set is arranged in the oven, the compression roller set comprises an upper compression roller and a lower compression roller, and the negative pole piece is pressed by the upper compression roller and the lower compression roller; and the negative pole piece sequentially bypasses the feeding conductive roller and the guide roller to be immersed in the electrolyte to be coated with lithium, the lithium coated negative pole piece enters a cleaning device to be cleaned, and the cleaned negative pole piece enters a drying device to be dried. Optionally, the distance between the upper pressing roller and the lower pressing roller is 1-5 mm.
According to the utility model, the cathode pole piece is communicated with the lithium source to form the primary battery, the current between the cathode pole piece and the lithium source is regulated through the current regulator, the electrochemical lithium coating of the pole piece is not required by an external power supply, the lithium coating on two sides of the cathode pole piece is uniform and stable, and further, the lithium coating amount can be accurately controlled by regulating the current and time; in addition, in the process of electrochemical lithium coating, side reactions occur simultaneously on the contact interface of the negative pole piece and the electrolyte to form an SEI film, when the battery is formed, the consumption of active lithium in the electrolyte and the positive pole material can be reduced, the first coulombic efficiency and the later cycle performance of the battery are effectively improved, the negative pole piece coated with lithium is cleaned under the conditions of ultrasound and heating, the cleaning efficiency is effectively improved, and the cleaned negative pole piece is dried under the pressing of a compression roller set to avoid the problem of edge curling.
As a preferred technical scheme of the utility model, the negative pole piece preparation system device further comprises an unreeling device and a reeling device, and the negative pole piece preparation system device comprises the unreeling device, a lithium coating device, a cleaning device, a drying device and the reeling device which are sequentially arranged along the pole piece processing direction.
As a preferred technical scheme of the utility model, at least one guide roller is arranged in the cleaning device, and the negative pole piece winds around the guide roller to move in a snake shape.
According to the utility model, the negative pole piece moves in a snake shape, so that more negative pole pieces are immersed in the cleaning agent, the floor area of the equipment is reduced, and the cleaning efficiency is improved.
As a preferred technical scheme of the utility model, the oven is positioned at the discharge end of the negative pole piece and is provided with an air inlet, the oven is positioned at the feed end of the negative pole piece and is provided with an air outlet, and the air outlet is connected with a waste gas processor.
According to the utility model, the movement direction of the negative pole piece is opposite to the wind direction in the oven, so that the pole piece is dried in a convection mode, and the drying efficiency is improved.
As a preferred technical scheme of the utility model, the press roller sets are arranged side by side along the horizontal direction, and the negative pole pieces sequentially pass through the press roller sets to move linearly.
As a preferred technical scheme of the utility model, the compression roller sets are arranged in a matrix in the oven, and the negative pole piece sequentially passes through each compression roller set to move in a snake shape.
According to the utility model, the negative pole piece moves in a snake shape in the oven, so that the retention time of the negative pole piece in the oven is increased, and the drying efficiency is improved.
As a preferred embodiment of the present invention, the lithium source includes a lithium block and/or a lithium plate.
As a preferred technical scheme of the utility model, the feeding conductive roller comprises an upper feeding roller and a lower feeding roller, the upper feeding roller and the lower feeding roller are pressed on the negative pole piece, and the lithium source is electrically connected with the upper feeding roller.
As a preferred technical scheme of the utility model, the guide rollers are arranged in the shell in a staggered manner, and the negative pole pieces are arranged in a snake-shaped manner around the guide rollers in the shell.
According to the utility model, the cathode pole piece moves in a snake shape in the electrolyte, so that the retention time of the cathode pole piece is increased, and the uniform and stable lithium coating of the cathode pole piece is ensured.
As a preferred technical solution of the present invention, the cleaning device includes a controller electrically connected to the heater, and the controller is configured to adjust a heating power of the heater.
The liquid level sensor is arranged on the shell and used for detecting the liquid level height of electrolyte in the shell.
The shell is externally connected with a liquid storage tank for storing electrolyte, and a pipeline for connecting the liquid storage tank and the shell is provided with an electromagnetic valve and a solution pump.
Exemplarily, a method for preparing a negative electrode plate by the negative electrode plate preparation system device is provided, and the preparation method specifically includes the following steps:
after being discharged by an unwinding device, a negative pole piece is pressed by an upper feeding roller and a lower feeding roller and is immersed in electrolyte around a guide roller, the negative pole piece immersed in the electrolyte and a lithium source form a primary battery, a current regulator regulates current between the negative pole piece and the lithium source at least twice to cover lithium under a protective atmosphere, the current regulation range is 0.005-1C, the time is 0-3 h, and the current and the time of each current regulation are sequentially increased,
and (II) the negative pole piece coated with lithium enters a cleaning device, is cleaned under the conditions of ultrasound and heating, the frequency of ultrasound is 10-50 kHz, the power is 10-100W, the heating temperature is 40-150 ℃, the negative pole piece is cleaned and then enters a drying device, is dried under the pressing of an upper pressing roller and a lower pressing roller, and is dried and then enters a winding device for winding.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the cathode pole piece is communicated with the lithium source to form the primary battery, the current between the cathode pole piece and the lithium source is regulated through the current regulator, the electrochemical lithium coating of the pole piece is not required by an external power supply, the lithium coating on two sides of the cathode pole piece is uniform and stable, and further, the lithium coating amount can be accurately controlled by regulating the current and time; in addition, in the process of electrochemical lithium coating, side reactions occur simultaneously on the contact interface of the negative pole piece and the electrolyte to form an SEI film, when the battery is formed, the consumption of active lithium in the electrolyte and the positive pole material can be reduced, the first coulombic efficiency and the later cycle performance of the battery are effectively improved, the negative pole piece coated with lithium is cleaned under the conditions of ultrasound and heating, the cleaning efficiency is effectively improved, and the cleaned negative pole piece is dried under the pressing of a compression roller set to avoid the problem of edge curling.
Drawings
Fig. 1 is a schematic structural diagram of a negative electrode tab preparation system apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a cleaning apparatus provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a cleaning apparatus provided in embodiment 2 of the present invention;
FIG. 4 is a schematic structural view of a cleaning apparatus provided in embodiment 3 of the present invention
Fig. 5 is a schematic structural view of a drying apparatus provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural view of a drying apparatus provided in embodiment 2 of the present invention;
fig. 7 is a schematic structural view of a drying apparatus provided in embodiment 3 of the present invention.
Wherein, 100-unwinding device; 200-a lithium cladding device; 201-feeding conductive roller; 202-a conductive line; 203-current regulator; 204-a lithium source; 205-a level sensor; 206-guide rollers; 207-a housing; 208-an electrolyte; 209-electromagnetic valve; 210-a liquid storage tank; 211-solution pump; 300-a cleaning device; 301-an ultrasonic generator; 302-a heater; 303-a controller; 304-a cleaning tank; 305-a guide roller; 306-a cleaning agent; 400-a drying device; 401-oven; 402-an air inlet; 403-air outlet; 404-a set of compression rollers; 500-an exhaust gas processor; 600-a winding device.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood by those skilled in the art that the present invention necessarily includes necessary piping, conventional valves and general pump equipment for achieving the complete process, but the above contents do not belong to the main innovation points of the present invention, and those skilled in the art can select the layout of the additional equipment based on the process flow and the equipment structure, and the present invention is not particularly limited to this.
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the utility model provides a negative electrode plate preparation system device, as shown in fig. 1, along the electrode plate processing direction, the negative electrode plate preparation system device includes a lithium coating device 200, a cleaning device 300 and a drying device 400, which are sequentially arranged; the lithium coating device 200 comprises a shell 207 injected with electrolyte 208, at least one guide roller 206 is arranged in the shell 207, a lithium source 204 immersed in the electrolyte 208 is also arranged in the shell 207, a feeding conductive roller 201 is arranged at the feeding end of the shell 207, the feeding conductive roller 201 is electrically connected with the lithium source 204, a current regulator 203 is arranged on a line for electrically connecting the feeding conductive roller 201 with the lithium source 204, a negative pole piece bypasses the feeding conductive roller 201 and the guide roller 206 and is immersed in the electrolyte 208, and the negative pole piece is electrically connected with the lithium source 204 through the feeding conductive roller 201 to coat lithium; the cleaning device 300 comprises a cleaning tank 304 injected with a cleaning agent 306, wherein an ultrasonic generator 301 and a heater 302 are arranged in the cleaning tank 304; the drying device 400 comprises an oven 401, at least one compression roller set 404 is arranged in the oven 401, the compression roller set 404 comprises an upper compression roller and a lower compression roller, and the negative pole piece is pressed by the upper compression roller and the lower compression roller; the negative pole piece sequentially bypasses the feeding conductive roller 201 and the guide roller 206 to be immersed in the electrolyte 208 for lithium coating, the lithium coated negative pole piece enters the cleaning device 300 for cleaning, and the cleaned negative pole piece enters the drying device 400 for drying. Optionally, the electrical connection is made by a wire 202, and the distance between the upper and lower pressing rollers is 1-5 mm.
According to the utility model, the cathode pole piece is communicated with the lithium source 204 to form the primary battery, the current between the cathode pole piece and the lithium source 204 is regulated through the current regulator 203, the pole piece is not required to be electrochemically coated with lithium by an external power supply, the lithium coating on two sides of the cathode pole piece is uniform and stable, and furthermore, the lithium coating amount can be accurately controlled by regulating the current and time; in addition, in the electrochemical lithium coating process, side reactions occur simultaneously on the contact interface of the negative pole piece and the electrolyte 208 to form an SEI film, when the battery is formed, the consumption of active lithium in the electrolyte 208 and a positive pole material can be reduced, the first coulombic efficiency and the later cycle performance of the battery are effectively improved, the negative pole piece coated with lithium is cleaned under the conditions of ultrasound and heating, the cleaning efficiency is effectively improved, and the cleaned negative pole piece is dried under the pressing of the pressing roller set 404 to avoid the problem of edge curling.
Further, the negative electrode plate preparation system device further comprises an unwinding device 100 and a winding device 600, and along the electrode plate processing direction, the negative electrode plate preparation system device comprises the unwinding device 100, the lithium coating device 200, the cleaning device 300, the drying device 400 and the winding device 600 which are sequentially arranged.
Further, at least one guide roller 305 is arranged in the cleaning device 300, and the negative pole piece winds around the guide roller 305 to move in a snake shape. According to the utility model, the negative pole piece moves in a snake shape, so that more negative pole pieces are immersed in the cleaning agent 306, the floor area of the equipment is reduced, and the cleaning efficiency is improved.
Further, the oven is provided with an air inlet 402 at the discharge end of the negative electrode plate, an air outlet 403 at the feed end of the oven at the negative electrode plate, and the air outlet 403 is connected with the exhaust gas processor 500. According to the utility model, the movement direction of the negative pole piece is opposite to the wind direction in the oven 401, so that the pole piece is dried in a convection mode, and the drying efficiency is improved.
Further, the compression roller sets 404 are arranged side by side along the horizontal direction, and the negative pole pieces sequentially pass through the compression roller sets 404 to move linearly.
Further, the roller sets 404 are arranged in a matrix in the oven 401, and the negative electrode plate sequentially passes through each roller set 404 to move in a serpentine shape. According to the utility model, the negative pole piece moves in a snake shape in the oven 401, so that the retention time of the negative pole piece in the oven 401 is increased, and the drying efficiency is improved.
Further, the lithium source 204 includes a lithium block and/or a lithium plate. The feeding conductive roller 201 comprises an upper feeding roller and a lower feeding roller, the upper feeding roller and the lower feeding roller are pressed on the negative pole piece, and the lithium source 204 is electrically connected with the upper feeding roller.
Further, the guide rollers 206 are staggered in the housing 207, and the negative electrode sheets are arranged in a serpentine shape in the housing 207 around the guide rollers 206. According to the utility model, the cathode pole piece moves in a snake shape in the electrolyte 208, so that the retention time of the cathode pole piece is increased, and the uniform and stable lithium coating of the cathode pole piece is ensured.
Further, the cleaning device 300 includes a controller 303 electrically connected to the heater 302, and the controller 303 is configured to adjust a heating power of the heater 302. A liquid level sensor 205 is disposed on the housing 207, and the liquid level sensor 205 is used for detecting the liquid level height of the electrolyte 208 in the housing 207. The housing 207 is externally connected with a liquid storage tank 210 for storing electrolyte 208, and a solenoid valve 209 and a solution pump 211 are arranged on a pipeline connecting the liquid storage tank 210 and the housing 207.
Exemplarily, a method for preparing a negative electrode plate by the negative electrode plate preparation system device is provided, and the preparation method specifically includes the following steps:
after being released from the unwinding device 100, the negative pole piece is pressed by an upper feeding roller and a lower feeding roller and is immersed into the electrolyte 208 around a guide roller 206, the negative pole piece immersed into the electrolyte 208 and a lithium source 204 form a primary battery, under the protective atmosphere, a current regulator 203 regulates the current between the negative pole piece and the lithium source 204 at least twice to cover lithium, the current regulation range is 0.005-1C, the time is 0-3 h, the current and the time of each current regulation are sequentially increased,
and (II) the negative pole piece coated with lithium enters a cleaning device 300, is cleaned under the conditions of ultrasound and heating, the frequency of ultrasound is 10-50 kHz, the power is 10-100W, the heating temperature is 40-150 ℃, and the negative pole piece enters a drying device 400 after being cleaned, is dried under the pressing of an upper pressing roller and a lower pressing roller, and enters a winding device 600 for winding after being dried.
Example 1
This embodiment provides a negative electrode plate preparation system device, which is based on a specific implementation manner, wherein as shown in fig. 2, a cleaning tank 304 is provided with a guide roller 305, and as shown in fig. 5, an oven 401 is provided with four pressing roller sets 404 arranged side by side along a horizontal direction.
Example 2
The embodiment provides a negative electrode plate preparation system device, which is based on a specific implementation manner, wherein, as shown in fig. 3, three guide rollers 305 are alternately arranged in a cleaning tank 304, as shown in fig. 6, twelve compression roller sets 404 arranged in a matrix are arranged in an oven 401, and the negative electrode plate moves in a serpentine shape.
Example 3
This embodiment provides a negative electrode plate preparation system device, which is based on a specific embodiment, wherein, as shown in fig. 4, nine guide rollers 305 are disposed in a cleaning tank 304, and as shown in fig. 7, sixteen pressure roller sets 404 disposed side by side along the horizontal direction are disposed in an oven 401.
Through the embodiment, the primary battery is formed by communicating the negative pole piece with the lithium source 204, the current between the negative pole piece and the lithium source 204 is regulated through the current regulator 203, the pole piece is not required to be electrochemically coated with lithium by an external power supply, the lithium coating on two sides of the negative pole piece is uniform and stable, and further, the lithium coating amount can be accurately controlled by regulating the current and time; in addition, in the electrochemical lithium coating process, side reactions occur simultaneously on the contact interface of the negative pole piece and the electrolyte 208 to form an SEI film, when the battery is formed, the consumption of active lithium in the electrolyte 208 and a positive pole material can be reduced, the first coulombic efficiency and the later cycle performance of the battery are effectively improved, the negative pole piece coated with lithium is cleaned under the conditions of ultrasound and heating, the cleaning efficiency is effectively improved, and the cleaned negative pole piece is dried under the pressing of the pressing roller set 404 to avoid the problem of edge curling.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A negative pole piece preparation system device is characterized in that the negative pole piece preparation system device comprises a lithium coating device, a cleaning device and a drying device which are sequentially arranged along the pole piece processing direction;
the lithium coating device comprises a shell injected with electrolyte, at least one guide roller is arranged in the shell, a lithium source immersed in the electrolyte is also arranged in the shell, a feeding conductive roller is arranged at the feeding end of the shell and is electrically connected with the lithium source, a current regulator is arranged on a circuit of the feeding conductive roller and the lithium source, a negative pole piece bypasses the feeding conductive roller and the guide roller and is immersed in the electrolyte, and the negative pole piece is electrically connected with the lithium source through the feeding conductive roller for lithium coating;
the cleaning device comprises a cleaning tank filled with a cleaning agent, and an ultrasonic generator and a heater are arranged in the cleaning tank;
the drying device comprises an oven, at least one compression roller set is arranged in the oven, the compression roller set comprises an upper compression roller and a lower compression roller, and the negative pole piece is pressed by the upper compression roller and the lower compression roller;
and the negative pole piece sequentially bypasses the feeding conductive roller and the guide roller to be immersed in the electrolyte to be coated with lithium, the lithium coated negative pole piece enters a cleaning device to be cleaned, and the cleaned negative pole piece enters a drying device to be dried.
2. The negative pole piece preparation system device of claim 1, further comprising an unwinding device and a winding device, wherein the negative pole piece preparation system device comprises the unwinding device, the lithium coating device, the cleaning device, the drying device and the winding device which are sequentially arranged along the pole piece processing direction.
3. The negative pole piece preparation system device of claim 1, wherein at least one guide roller is arranged in the cleaning device, and the negative pole piece winds around the guide roller to move in a snake shape.
4. The negative pole piece preparation system device of claim 1, wherein the oven is provided with an air inlet at the discharge end of the negative pole piece, and an air outlet at the feed end of the negative pole piece, and the air outlet is connected with an exhaust gas processor.
5. The negative pole piece preparation system device of claim 1, wherein the compression roller sets are arranged side by side along the horizontal direction, and the negative pole pieces sequentially pass through the compression roller sets to move linearly.
6. The negative pole piece preparation system device of claim 1, wherein the compression roller sets are arranged in a matrix in the oven, and the negative pole piece sequentially passes through each compression roller set to move in a serpentine shape.
7. The negative electrode tab preparation system apparatus of claim 1, wherein said lithium source comprises a lithium block and/or a lithium plate.
8. The negative pole piece preparation system device of claim 1, wherein the feeding conductive roller comprises an upper feeding roller and a lower feeding roller, the upper feeding roller and the lower feeding roller press-fit the negative pole piece, and the lithium source is electrically connected with the upper feeding roller.
9. The negative pole piece preparation system device of claim 1, wherein the guide rollers are staggered in the housing, and the negative pole pieces are arranged in a serpentine shape in the housing around the guide rollers.
10. The negative pole piece preparation system device of claim 1, wherein the cleaning device comprises a controller electrically connected to the heater, the controller being configured to adjust a heating power of the heater;
the shell is provided with a liquid level sensor, and the liquid level sensor is used for detecting the liquid level height of electrolyte in the shell;
the shell is externally connected with a liquid storage tank for storing electrolyte, and a pipeline for connecting the liquid storage tank and the shell is provided with an electromagnetic valve and a solution pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120999374.4U CN215512364U (en) | 2021-05-11 | 2021-05-11 | Negative pole piece preparation system device |
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|---|---|---|---|
| CN202120999374.4U CN215512364U (en) | 2021-05-11 | 2021-05-11 | Negative pole piece preparation system device |
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| CN215512364U true CN215512364U (en) | 2022-01-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023151447A1 (en) * | 2022-02-10 | 2023-08-17 | 宁德时代新能源科技股份有限公司 | Electrode sheet heating device, and electrode sheet production system and method |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023151447A1 (en) * | 2022-02-10 | 2023-08-17 | 宁德时代新能源科技股份有限公司 | Electrode sheet heating device, and electrode sheet production system and method |
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