CN217847993U - Pre-lithiation device for battery negative plate - Google Patents

Abstract

The utility model provides a lithiation device in advance of battery negative pole piece, including lithiation structure in advance, lithiation structure includes in advance: a machine base; the pre-lithiation pool is arranged above the stand and is provided with an accommodating groove for accommodating a pre-lithiation solution; the heating device is arranged on the machine base and used for heating the pre-lithiation solution; the stirring device is arranged in the holding tank and is used for stirring the pre-lithiation solution; and the driving mechanism is arranged in the machine base and drives the stirring device to rotate. Use the technical scheme of the utility model can solve the problem that the treatment effeciency of the lithiation device in advance in the correlation technique is low effectively.

Description

Pre-lithiation device for battery negative plate

Technical Field

The utility model relates to a chemistry of battery negative pole piece is lithiation processing field in advance, particularly, relates to a lithiation device in advance of battery negative pole piece.

Background

Currently, the negative electrode materials of lithium ion batteries available for commercial use mainly include graphite materials, soft carbon materials, hard carbon materials, silicon carbon materials, and the like. With the higher and higher requirements of downstream applications on the energy density of batteries, the high-capacity lithium battery negative electrode material becomes a research focus. However, compared with the traditional graphite cathode material, the high-capacity cathode material has the problem of low coulombic efficiency for the first time, and the energy density of the battery is seriously influenced. The main reason why the first coulombic efficiency of the lithium battery is low is that the organic electrolyte is reduced and decomposed on the surface of the negative electrode material during the first charging process of the battery to form a solid electrolyte interface film (SEI film), and the process consumes lithium in the positive electrode of the battery and is irreversible.

The prelithiation is a method of adding a lithium source to an electrode material before the operation of a lithium battery, and the method can compensate for lithium consumed during the formation of an SEI film, thereby improving the coulombic efficiency and energy density of the first loop of the battery. The prelithiation method mainly comprises positive prelithiation and negative prelithiation, and chemical prelithiation is a method for supplementing lithium for negative materials, and is more and more emphasized due to the advantages of safety, stability, controllable lithiation degree, high reaction speed and the like.

The processing efficiency of the current battery negative plate prelithiation device is low, so that the period of the prelithiation step is long.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide a pre-lithiation device for a battery negative plate, so as to solve the problems in the related art.

In order to realize the above-mentioned purpose, the utility model provides a lithiation device in advance of battery negative pole piece, including lithiation structure in advance, lithiation structure includes in advance: a machine base; the pre-lithiation pool is arranged above the stand and is provided with an accommodating tank for accommodating a pre-lithiation solution; the heating device is arranged on the machine base and used for heating the pre-lithiation solution; the stirring device is arranged in the holding tank and is used for stirring the pre-lithiation solution; and the driving mechanism is arranged in the machine base and drives the stirring device to rotate.

Further, lithiation pond includes the bottom plate in advance and sets up in a plurality of curb plates of the circumferential direction of bottom plate, and a plurality of curb plates and bottom plate enclose into the holding tank, and the lithiation device still includes in advance: the rack is hung on the curb plate of predetermineeing the lithiation pond, is provided with a plurality of standing grooves that are located the holding tank on the rack.

Further, the rack includes the stores pylon and sets up a plurality of boards of placing on the stores pylon, and every is placed and all is provided with the standing groove on the board, and the stores pylon includes parallel arrangement's first riser and second riser and connects the connecting plate between first riser and the second riser, and a plurality of boards of placing set up on the second riser, and the curb plate clamp in lithiation pond in advance is located between first riser and the second riser.

Furthermore, the placing plate comprises a bearing plate and a surrounding plate arranged on the circumferential direction of the bearing plate, the bearing plate and the surrounding plate form a placing groove in a surrounding mode, and a plurality of through holes are formed in the bearing plate.

Further, agitating unit is including setting up the magnetism rotor in the holding tank, and actuating mechanism is including setting up the magnetic drive spare in the frame.

Further, lithiation pond still includes the baffle in advance, and a plurality of sub-holding tanks of mutually independent are separated into with the holding tank to the baffle, and agitating unit includes a plurality ofly that set up with sub-holding tank one-to-one.

Further, the prelithiation apparatus also includes a purge structure.

Further, the cleaning structure includes: the cleaning pool is arranged adjacent to the prelithiation pool and is provided with a cleaning tank; and the spray pipe extends into the cleaning tank.

Further, the shower includes along the feed liquor pipe that vertical direction set up and the interval sets up a plurality of nozzles on the feed liquor pipe.

Further, each nozzle is rotatably disposed on the liquid inlet pipe.

Use the technical scheme of the utility model, can hold lithiation solution in advance in the lithiation pond in advance, treat that the negative pole piece that lithiation was handled in advance immerges and carries out lithiation in advance in the lithiation solution and handle. Still be provided with agitating unit in the lithiation pond in advance, be provided with the drive structure of drive agitating unit stirring in the frame. After the driving structure is started, the stirring device rotates to enable the pre-lithiation solution to flow, so that the pre-lithiation solution can be kept uniform and stable, and the pre-lithiation effect of the negative plate can be improved. Still be provided with heating device in the frame, heat the lithiation solution in advance through heating device and help promoting the lithiation efficiency in advance of negative pole piece. The present embodiment can effectively solve the problem of low processing efficiency of the prelithiation apparatus in the related art by providing the heating apparatus and the stirring apparatus.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of an embodiment of a prelithiation structure of a prelithiation apparatus according to the present invention;

fig. 2 shows a schematic structural view of the pre-lithiated structured holding rack of fig. 1;

figure 3 shows a schematic structural view of a placing plate of the placing shelf of figure 2;

fig. 4 shows a schematic structural diagram of a cleaning structure of a prelithiation apparatus.

Wherein the figures include the following reference numerals:

10. pre-lithiation of the structure; 20. a machine base; 30. a pre-lithiation tank; 31. a base plate; 32. a side plate; 33. a partition plate; 40. a heating device; 50. a stirring device; 60. placing a rack; 61. a hanger; 611. a first vertical plate; 612. a second vertical plate; 613. a connecting plate; 62. placing the plate; 621. a carrier plate; 622. enclosing plates; 70. cleaning the structure; 80. a cleaning pool; 90. a shower pipe; 91. a liquid inlet pipe; 92. and (4) a nozzle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1, the prelithiation apparatus of the battery negative electrode sheet of the present embodiment includes a prelithiation structure 10, where the prelithiation structure 10 includes: the machine base 20, the pre-lithiation tank 30, the heating device 40, the stirring device 50 and the driving mechanism. Wherein, the pre-lithiation pool 30 is arranged above the machine base 20, and the pre-lithiation pool 30 is provided with a holding tank for holding pre-lithiation solution; the heating device 40 is arranged on the stand 20 to heat the pre-lithiation solution; the stirring device 50 is arranged in the holding tank to stir the prelithiation solution; the driving mechanism is disposed in the housing 20 and drives the stirring device 50 to rotate.

By applying the technical scheme of this embodiment, the pre-lithiation solution can be contained in the pre-lithiation tank 30, and the negative electrode sheet to be subjected to pre-lithiation treatment is immersed in the pre-lithiation solution for pre-lithiation treatment. The pre-lithiation pool 30 is also provided with a stirring device 50, and the machine base 20 is internally provided with a driving structure for driving the stirring device to stir. After the driving structure is started, the stirring device 50 rotates to enable the pre-lithiation solution to flow, so that the pre-lithiation solution can be kept uniform and stable, and the pre-lithiation effect of the negative plate is promoted. A heating device 40 is further arranged in the machine base 20, and the heating of the pre-lithiation solution by the heating device 40 is helpful for improving the pre-lithiation efficiency of the negative plate. The present embodiment can effectively solve the problem of low processing efficiency of the pre-lithiation apparatus in the related art by providing the heating apparatus 40 and the stirring apparatus 50.

It should be noted that the heating temperature of the heating device 40 is 0-80 deg.C, and the rotation speed of the stirring device 50 is 10-300r/min.

The pre-lithiation device in the related art is mostly used for processing a wound pole piece, and a corresponding pre-lithiation processing device is also lacked for a negative pole piece of a button cell. The button cell negative plate has the following problems in the pre-lithiation process: firstly, the aromatic hydrocarbon pre-lithiation solution has dark color, so that the pole piece is difficult to take out after the pole piece is pre-lithiated; secondly, in the process of pre-lithiating pole pieces in batches, the pole pieces are easy to stack, and the pre-lithiation effect is influenced. In order to solve the above problems, the present embodiment designs a placing rack 60 for placing the button cell negative electrode sheet, and the placing rack 60 is installed on the pre-lithiation tank 30 in a hanging manner. Specifically, the method comprises the following steps:

as shown in fig. 1 to fig. 3, in the present embodiment, the prelithiation pool 30 includes a bottom plate 31 and a plurality of side plates 32 disposed in a circumferential direction of the bottom plate 31, the plurality of side plates 32 and the bottom plate 31 enclose an accommodating groove, and the prelithiation device further includes: the placing rack 60 is hung on the side plate 32 of the pre-lithiation pool 30, and a plurality of placing grooves located in the containing grooves are formed in the placing rack 60. In the structure, the size of the button cell negative electrode sheet is small, the placing frame 60 comprises multiple layers, the button cell negative electrode sheet can be laid on the placing frame 60, and the button cell negative electrode sheet is prevented from being stacked mutually when the button cell negative electrode sheet is laid. After the pre-lithiation treatment is completed, the placing frame 60 can be lifted to take out the button cell negative plate, so that the button cell negative plate is prevented from being found in the pre-lithiation solution, and the efficiency of the pre-lithiation treatment is improved.

Further, as shown in fig. 1 to 3, in the present embodiment, the placing rack 60 includes a hanging rack 61 and a plurality of placing plates 62 disposed on the hanging rack 61, each placing plate 62 is provided with a placing groove, the hanging rack 61 includes a first vertical plate 611 and a second vertical plate 612 disposed in parallel and a connecting plate 613 connecting the first vertical plate 611 and the second vertical plate 612, the plurality of placing plates 62 are disposed on the second vertical plate 612, and the side plate 32 of the prelithiation pool 30 is sandwiched between the first vertical plate 611 and the second vertical plate 612. In the above structure, the plurality of placing plates 62 can provide sufficient placing space for the negative plate of the button cell. The rack 61 set up can enough realize rack 60 and the stable connection of lithiation pond 30 in advance, make rack 60's simple to operate swift again simultaneously, the operating personnel of being convenient for operate.

It should be noted that a plurality of placing racks 60 can be hung on each side plate 32.

As shown in fig. 1 to 3, in the present embodiment, the placement plate 62 includes a carrier plate 621 and a surrounding plate 622 disposed in a circumferential direction of the carrier plate 621, the carrier plate 621 and the surrounding plate 622 surround a placement groove, and a plurality of through holes are provided on the carrier plate 621. In the structure, because the size of the button cell negative plate is small, the button cell negative plate easily falls off from the placing frame when the stirring device 50 is opened, and the button cell negative plate is difficult to find. The placing plate 62 is provided in a form including a carrier plate 621 and a surrounding plate 622, and the surrounding plate 622 can prevent the negative plate of the button cell from falling off the carrier plate 621.

As shown in fig. 1, in the present embodiment, the stirring device 50 includes a magnetic rotor disposed in the receiving groove, and the driving mechanism includes a magnetic driving member disposed in the housing 20. In the above-mentioned structure, adopt the magnetism rotor to stir and handle and compare with traditional stirring vane that sets up, the structure is simpler, and magnetism rotor occupation space is littleer, can not form the interference to placing rack 60 in lithiation pond 30 in advance.

As shown in fig. 1, in the present embodiment, the prelithiation tank 30 further includes a partition plate 33, the partition plate 33 partitions the holding tank into a plurality of sub-holding tanks independent of each other, and the stirring device 50 includes a plurality of sub-holding tanks disposed in one-to-one correspondence with the sub-holding tanks. In the structure, the plurality of sub-accommodating grooves are not communicated with each other, and different experimental conditions can be adopted in different sub-accommodating grooves for carrying out pre-lithiation experiments. Functionality of the prelithiation device is improved.

The heating means 40 may include a plurality of heating means, and the plurality of heating means may be provided in one-to-one correspondence with the plurality of sub-tanks,

As shown in fig. 4, in the present embodiment, the prelithiation apparatus further includes a cleaning structure 70. The cleaning structure 70 can clean the battery negative plate after the pre-lithiation, and the functionality of the pre-lithiation device is improved.

As shown in fig. 4, in the present embodiment, the cleaning structure 70 includes a cleaning bath 80 and a shower 90. The cleaning pool 80 is arranged adjacent to the pre-lithiation pool 30, and the cleaning pool 80 is provided with a cleaning tank; the shower 90 extends into the cleaning tank. The structure cleans the battery negative plate after the pre-lithiation by the continuously sprayed cleaning agent in the spray pipe 90, and has the advantages of simple structure and good cleaning effect.

It should be noted that the placing frame 60 may also be hung on the side wall of the washing tank 80, and the placing frame 60 taken out from the pre-lithiation tank may be directly hung on the side wall of the washing tank 80, so as to improve the cleaning efficiency of the battery negative electrode plate.

As shown in fig. 4, in the present embodiment, the shower pipe 90 includes a liquid inlet pipe 91 disposed in a vertical direction and a plurality of nozzles 92 disposed at intervals on the liquid inlet pipe 91. The arrangement mode increases the spraying point position of the cleaning agent, and is favorable for further improving the cleaning effect and the cleaning efficiency of the battery negative plate.

As shown in fig. 4, in the present embodiment, each nozzle 92 is rotatably provided on the liquid inlet pipe 91. In the structure, the cleaning agent can drive the nozzle 92 to rotate when being sprayed out, so that the cleaning agent is sprayed out in a rotating mode, and the cleaning effect can be improved. On the other hand, after the cleaning agent submerges the battery negative plate, the cleaning agent in the cleaning pool 80 can be driven to flow by the aid of the cleaning agent sprayed in a rotating mode, and accordingly cleaning efficiency of the battery negative plate is improved further.

The prelithiation experiment of the button cell negative plate is explained as follows: the pre-lithiation device can pre-lithiate various negative plates, including but not limited to silicon/carbon negative plates, hard carbon negative plates and graphite negative plates, and the size of the negative plates is not required. The hard carbon negative plate is taken as an example for explanation, the experiment requires to be used in an environment with the dew point temperature less than or equal to 40 ℃, and inert gas is required to be introduced for protection in the experiment process.

The prelithiation experiment comprises a prelithiation step and a cleaning and drying step, wherein the prelithiation step comprises the following steps:

firstly, the hard carbon negative plate is placed in a placing plate, then the placing frame is clamped on the side wall of the pre-lithiation pool, aromatic hydrocarbon pre-lithiation solution is added into the containing tank, the heating device and the stirring device are opened as required, and the placing frame is taken down after the pre-lithiation is finished. The lithium salt of the aromatic hydrocarbon includes but is not limited to any one or more combination of naphthalene lithium salt, biphenyl lithium salt and methyl naphthalene lithium salt, and the solvent includes but is not limited to any one or more combination of ethylene glycol dimethyl ether, tetrahydrofuran and methyl tetrahydrofuran.

The cleaning and drying steps include:

after the pre-lithiation is finished, the placing frame is taken down and is directly clamped on the side wall of the cleaning tank, the multi-head spray pipe is opened to clean the pole piece, and the cleaning time is determined according to the condition of the pole piece. And after the pole piece is cleaned, taking out the placing rack and standing, and completing the pre-lithiation of the hard carbon negative pole piece after the pole piece is dried. The pole piece cleaning agent comprises but is not limited to any one or the combination of more than two of ethylene glycol dimethyl ether, tetrahydrofuran and methyltetrahydrofuran.

Specific example 1:

in the pole piece pre-lithiation module, the aromatic hydrocarbon lithium salt is naphthalene lithium salt, the solvent is ethylene glycol dimethyl ether, the concentration is 0.01-5mol/L, the pole piece is a hard carbon negative pole piece, and the pre-lithiation time is 1-10min; the cleaning agent in the pole piece cleaning module is ethylene glycol dimethyl ether, and the cleaning time is 1-10min. And closing the heating device and the stirring device in the prelithiation process.

Example 2:

compared with the example 1, the heating device is opened in the pre-lithiation process, the heating temperature is 10-40 ℃, and other experimental parameters and experimental conditions are the same as those of the example 1.

Example 3:

compared with the embodiment 1, the stirring device is opened in the pre-lithiation process, the rotating speed is 10-100r/min, and other experimental parameters and experimental conditions are the same as those in the embodiment 1.

Example 4:

in the pole piece pre-lithiation module, the aromatic hydrocarbon lithium salt adopts methylnaphthalene lithium salt, the solvent adopts ethylene glycol dimethyl ether, the concentration is 0.01-5mol/L, the pole piece is a hard carbon negative pole piece, and the pre-lithiation time is 1-10min; the cleaning agent in the pole piece cleaning module adopts glycol dimethyl ether, and the cleaning time is 1-10mim; the heating temperature of the heating device is 10-40 ℃; the rotating speed of the stirring device is 10-100r/min.

And (3) analyzing an experimental result:

as can be seen from the above table, the device of the present invention can complete the chemical pre-lithiation of the hard carbon negative plate, and is not limited to the pre-lithiation of the hard carbon negative plate; the cycle retention rate of the battery can reach more than 85% after 800 times; the heating device and the stirring device can improve the pre-lithiation efficiency of the hard carbon negative plate; other prelithiation solutions may also be used to accomplish prelithiation in the present apparatus.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the directional terms such as "front, back, upper, lower, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and in the case of not making a contrary explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A pre-lithiation apparatus of a battery negative electrode sheet, comprising a pre-lithiation structure (10), the pre-lithiation structure (10) comprising:

a frame (20);

the pre-lithiation pool (30) is arranged above the stand (20), and the pre-lithiation pool (30) is provided with a containing tank for containing a pre-lithiation solution;

a heating device (40) disposed on the housing (20) to heat the pre-lithiation solution;

a stirring device (50) disposed within the holding tank to stir the pre-lithiation solution;

the driving mechanism is arranged in the machine base (20) and drives the stirring device (50) to rotate.

2. The prelithiation device according to claim 1, wherein the prelithiation bath (30) comprises a bottom plate (31) and a plurality of side plates (32) disposed in a circumferential direction of the bottom plate (31), the plurality of side plates (32) and the bottom plate (31) enclosing the receiving groove, the prelithiation device further comprising:

the placing frame (60) is hung on the side plate (32) of the pre-lithiation pool (30), and a plurality of placing grooves located in the containing groove are formed in the placing frame (60).

3. The prelithiation device according to claim 2, wherein the rack (60) comprises a rack (61) and a plurality of placement plates (62) disposed on the rack (61), each placement plate (62) is provided with a placement groove, the rack (61) comprises a first vertical plate (611) and a second vertical plate (612) disposed in parallel and a connecting plate (613) connecting the first vertical plate (611) and the second vertical plate (612), the plurality of placement plates (62) are disposed on the second vertical plate (612), and the side plate (32) of the prelithiation pool (30) is sandwiched between the first vertical plate (611) and the second vertical plate (612).

4. The prelithiation device according to claim 3, wherein the placement plate (62) comprises a carrier plate (621) and a shroud (622) arranged in a circumferential direction of the carrier plate (621), the carrier plate (621) and the shroud (622) enclosing the placement slot, and a plurality of through holes are arranged in the carrier plate (621).

5. The prelithiation apparatus according to claim 1, characterized in that the stirring device (50) comprises a magnetic rotor disposed within the receiving tank, and the drive mechanism comprises a magnetic drive disposed within the housing (20).

6. The prelithiation apparatus according to claim 1, wherein the prelithiation cell (30) further comprises a separator (33), wherein the separator (33) divides the holding tank into a plurality of sub-holding tanks that are independent of each other, and wherein the stirring device (50) comprises a plurality of sub-holding tanks that are arranged in one-to-one correspondence with the sub-holding tanks.

7. The prelithiation apparatus according to any one of claims 1 to 6, further comprising a washing structure (70).

8. The prelithiation apparatus according to claim 7, characterized in that the purge structure (70) comprises:

a washing tank (80) disposed adjacent to the pre-lithiation tank (30), the washing tank (80) having a washing tank;

and the spray pipe (90) extends into the cleaning tank.

9. The prelithiation apparatus according to claim 8, wherein the shower (90) comprises a liquid inlet pipe (91) arranged in a vertical direction and a plurality of nozzles (92) arranged at intervals on the liquid inlet pipe (91).

10. The prelithiation apparatus according to claim 9, wherein each of the nozzles (92) is rotatably disposed on the liquid inlet tube (91).

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