阅读说明：本技术 一种极片预锂化生产线 (Pole piece prelithiation production line ) 是由 吴庆利 阳如坤 孙崇庚 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种极片预锂化生产线,涉及锂电池生产技术领域。该极片预锂化生产线包括浸嵌预锂装置、双向泵、冷藏装置、清洗装置和除液烘干装置。冷藏装置通过双向泵与浸嵌预锂装置连接,冷藏装置用于冷藏储存锂溶液,双向泵用于将冷藏装置内的锂溶液抽入浸嵌预锂装置,浸嵌预锂装置用于利用锂溶液对极片进行浸嵌预锂,双向泵还用于在预锂作业完成后将浸嵌预锂装置内的锂溶液抽入冷藏装置,浸嵌预锂装置通过清洗装置与除液烘干装置连接,清洗装置用于对极片进行清洗,除液烘干装置用于除去极片上残留的液体。本发明提供的极片预锂化生产线能够进行锂溶液的冷藏保存,以便于实现锂溶液的再次利用,降低极片预锂成本,降低锂电池生产成本。(The invention discloses a pole piece pre-lithiation production line, and relates to the technical field of lithium battery production. The pole piece prelithiation production line comprises a soaking and embedding prelithiation device, a bidirectional pump, a refrigeration device, a cleaning device and a liquid removal and drying device. The refrigeration device is connected with the dipping and embedding pre-lithium device through a bidirectional pump, the refrigeration device is used for refrigerating and storing lithium solution, the bidirectional pump is used for pumping the lithium solution in the refrigeration device into the dipping and embedding pre-lithium device, the dipping and embedding pre-lithium device is used for dipping and embedding pre-lithium for the pole pieces by utilizing the lithium solution, the bidirectional pump is also used for pumping the lithium solution in the dipping and embedding pre-lithium device into the refrigeration device after the pre-lithium operation is completed, the dipping and embedding pre-lithium device is connected with the liquid removing and drying device through a cleaning device, the cleaning device is used for cleaning the pole pieces, and the liquid removing and drying device is used for removing residual liquid on the pole pieces. The pole piece pre-lithiation production line provided by the invention can be used for refrigerating and storing the lithium solution, so that the lithium solution can be reused, the pole piece pre-lithiation cost is reduced, and the lithium battery production cost is reduced.)

1. A pole piece prelithiation production line is characterized by comprising a soaking and embedding prelithiation device, a bidirectional pump, a refrigeration device, a cleaning device and a liquid removal and drying device, the refrigerating device is connected with the lithium immersion and insertion device through the bidirectional pump, and is used for refrigerating and storing lithium solution, the bidirectional pump is used for pumping the lithium solution in the refrigeration device into the lithium soaking and embedding device, the lithium dipping and embedding device is used for dipping and embedding lithium for the pole piece by utilizing the lithium solution, the bidirectional pump is also used for sucking the lithium solution in the lithium dipping and embedding device into the refrigeration device for storage after the lithium embedding operation is finished, the immersion embedding pre-lithium device is connected with the liquid removing and drying device through the cleaning device, the cleaning device is used for cleaning the pole pieces, and the liquid removing and drying device is used for removing residual liquid on the pole pieces.

2. The pole piece prelithiation production line of claim 1, wherein the refrigeration device is provided with a refrigeration cavity for storing the lithium solution, the refrigeration cavity is filled with an inert gas, and a refrigeration temperature of the refrigeration device ranges from-10 degrees celsius to 0 degrees celsius.

3. The pole piece prelithiation production line of claim 1, wherein the pre-lithium immersion insertion device comprises a pre-lithium box, a heating mechanism and a guide roller mechanism, the guide roller mechanism is installed in the pre-lithium box, the guide roller mechanism is used for driving the pole piece to move in a winding manner, the heating mechanism is connected with the pre-lithium box, the heating mechanism is used for heating the pre-lithium box so as to enable the pole piece to be pre-lithium immersion-inserted at a preset temperature, and the pre-lithium box is connected with the bidirectional pump.

4. The pole piece prelithiation production line of claim 3, wherein, lithium case includes zone of heating, heat preservation and protective layer in advance, the protective layer cover is located outside the heat preservation, the heat preservation cover is located outside the zone of heating, the zone of heating with heating mechanism connects, the heat preservation is used for right the zone of heating keeps warm.

5. The pole piece prelithiation production line of claim 1, wherein the pole piece prelithiation production line further comprises a lithium supplement device, the lithium supplement device is connected with the lithium immersion insertion pre-lithium device, and the lithium supplement device is configured to supplement lithium ions to the lithium solution of the lithium immersion insertion pre-lithium device.

6. The pole piece prelithiation production line of claim 5, wherein the lithium replenishment device includes a conductivity sensor and a lithium replenishment box, the conductivity sensor is installed in the lithium immersion and intercalation device and connected to the lithium replenishment box, the conductivity sensor is configured to detect a conductivity of the lithium solution in the lithium immersion and intercalation device, and control the lithium replenishment box to input lithium ions into the lithium immersion and intercalation device when the conductivity is lower than a preset value.

7. The pole piece prelithiation production line of claim 1, wherein the cleaning device comprises a spray initial washing mechanism and a residual liquid cleaning mechanism, the dip pre-embedding lithium pre-washing device is connected with the residual liquid cleaning mechanism through the spray initial washing mechanism, the residual liquid cleaning mechanism is connected with the liquid removing and drying device, the spray initial washing mechanism is used for carrying out primary washing on the pole piece, and the residual liquid cleaning mechanism is used for carrying out secondary washing on the pole piece.

8. The pole piece prelithiation production line of claim 1, wherein the liquid removal drying device includes an air knife liquid removal mechanism and a drying mechanism, the cleaning device is connected with the drying mechanism through the air knife liquid removal mechanism, the air knife liquid removal mechanism is used for blowing off residual liquid on the pole piece, and the drying mechanism is used for drying the pole piece.

9. The pole piece prelithiation production line of claim 1, wherein the pole piece prelithiation production line further comprises an unwinding device, a winding device, and a storage tank, wherein the unwinding device is connected with the immersion embedding prelithiation device, one end of the winding device is connected with the liquid removal drying device, the other end of the winding device is connected with the storage tank, and the storage tank is filled with inert gas.

10. The pole piece prelithiation production line of claim 9, wherein the pole piece prelithiation production line further comprises a waste gas collection processing device, the waste gas collection processing device is simultaneously connected with the unwinding device, the immersion embedding prelithiation device, the cleaning device, the liquid removal drying device and the winding device, and the waste gas collection processing device is used for collecting and processing waste gas.

Technical Field

The invention relates to the technical field of lithium battery production, in particular to a pole piece prelithiation production line.

Background

At present, in the first charge and discharge process of a graphite cathode material, 5% -10% of irreversible lithium loss exists, in the first charge and discharge process of a high-capacity silicon cathode material, the irreversible lithium ion loss reaches 15% -35%, and in order to ensure the energy density of a lithium ion battery, the irreversible lithium consumption in the first charge and discharge process needs to be supplemented in advance by means of a lithium supplementing technology. But the pre-lithium cost of the pole piece is higher at present, which leads to higher production cost of the lithium battery.

In view of this, it is very important to design and manufacture a pole piece prelithiation production line capable of reducing the prelithiation cost, especially in the production of lithium batteries.

Disclosure of Invention

The invention aims to provide a pole piece pre-lithiation production line which can be used for refrigerating and storing a lithium solution so as to realize reutilization of the lithium solution, reduce the pole piece pre-lithiation cost and reduce the production cost of a lithium battery.

The invention is realized by adopting the following technical scheme.

The utility model provides a pole piece lithiation production line in advance, including dipping and inlaying the lithium device in advance, the bidirectional pump, a refrigerating plant, belt cleaning device and remove liquid drying device, the refrigerating plant passes through the bidirectional pump and soaks to inlay the lithium device in advance and be connected, the refrigerating plant is used for cold-stored storage lithium solution, the bidirectional pump is used for soaking and inlaying the lithium device in advance with the lithium solution suction in the refrigerating plant, soak and inlay the lithium device in advance and be used for utilizing lithium solution to soak and inlay lithium in advance to the pole piece, the bidirectional pump still is used for soaking and inlays the lithium solution suction refrigerating plant in the lithium device in advance and preserve after lithium operation is accomplished in advance, it is connected with removing liquid drying device to soak and inlay the lithium device in advance, belt cleaning device is used for wasing the pole piece, it is used for removing remaining liquid on the pole piece to remove liquid drying device.

Optionally, the refrigeration device is provided with a refrigeration cavity for storing the lithium solution, the refrigeration cavity is filled with an inert gas, and the refrigeration temperature of the refrigeration device ranges from-10 ℃ to 0 ℃.

Optionally, the lithium pre-immersion embedding device comprises a lithium pre-immersion box, a heating mechanism and a guide roller mechanism, wherein the guide roller mechanism is installed in the lithium pre-immersion box, the guide roller mechanism is used for driving the pole piece to move in a winding manner, the heating mechanism is connected with the lithium pre-immersion box, the heating mechanism is used for heating the lithium pre-immersion box so that the pole piece is immersed and embedded with the pre-immersion lithium at a preset temperature, and the lithium pre-immersion box is connected with the bidirectional pump.

Optionally, the lithium box includes zone of heating, heat preservation and protective layer in advance, and the protective layer cover is located outside the heat preservation, and outside the zone of heating was located to the heat preservation cover, the zone of heating was connected with heating mechanism, and the heat preservation is used for keeping warm to the zone of heating.

Optionally, the pole piece pre-lithiation production line further comprises a lithium supplementing device, the lithium supplementing device is connected with the lithium immersion and intercalation pre-lithiation device, and the lithium supplementing device is used for supplementing lithium ions to a lithium solution of the lithium immersion and intercalation pre-lithiation device.

Optionally, the lithium replenishing device comprises a conductivity sensor and a lithium replenishing box, the conductivity sensor is installed in the lithium immersion and intercalation device and is connected with the lithium replenishing box, and the conductivity sensor is used for detecting the conductivity of the lithium solution in the lithium immersion and intercalation device and controlling the lithium replenishing box to input lithium ions into the lithium immersion and intercalation device when the conductivity is lower than a preset value.

Optionally, the cleaning device comprises a spraying and primary washing mechanism and a residual liquid cleaning mechanism, the dipping and embedding lithium pre-washing device is connected with the residual liquid cleaning mechanism through the spraying and primary washing mechanism, the residual liquid cleaning mechanism is connected with the liquid removing and drying device, the spraying and primary washing mechanism is used for primary washing of the pole pieces, and the residual liquid cleaning mechanism is used for secondary washing of the pole pieces.

Optionally, the liquid removing and drying device comprises an air knife liquid removing mechanism and a drying mechanism, the cleaning device is connected with the drying mechanism through the air knife liquid removing mechanism, the air knife liquid removing mechanism is used for blowing off residual liquid on the pole piece, and the drying mechanism is used for drying the pole piece.

Optionally, the pole piece prelithiation production line further comprises an unwinding device, a winding device and a storage box, wherein the unwinding device is connected with the immersion embedding prelithiation device, one end of the winding device is connected with the liquid removal drying device, the other end of the winding device is connected with the storage box, and the storage box is filled with inert gas.

Optionally, the pole piece prelithiation production line further includes a waste gas collection processing device, the waste gas collection processing device is connected with the unwinding device, the dipping and embedding prelithiation device, the cleaning device, the liquid removal drying device and the winding device simultaneously, and the waste gas collection processing device is used for collecting and processing waste gas.

The pole piece prelithiation production line provided by the invention has the following beneficial effects:

according to the pole piece prelithiation production line provided by the invention, the refrigeration device is connected with the dipping and embedding prelithiation device through the bidirectional pump, the refrigeration device is used for refrigerating and storing a lithium solution, the bidirectional pump is used for pumping the lithium solution in the refrigeration device into the dipping and embedding prelithiation device, the dipping and embedding prelithiation device is used for carrying out dipping and embedding prelithiation on the pole piece by using the lithium solution, the bidirectional pump is also used for pumping the lithium solution in the dipping and embedding prelithiation device into the refrigeration device for storage after the prelithiation operation is finished, the dipping and embedding prelithiation device is connected with the liquid removing and drying device through the cleaning device, the cleaning device is used for cleaning the pole piece, and the liquid removing and drying device is used for removing residual liquid on the pole piece. Compared with the prior art, the pole piece pre-lithiation production line provided by the invention adopts the refrigerating device connected with the dipping and embedding pre-lithiation device through the bidirectional pump, so that the lithium solution can be refrigerated and stored, the reutilization of the lithium solution is convenient, the pole piece pre-lithiation cost is reduced, and the lithium battery production cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a pole piece prelithiation production line provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a device for impregnating and embedding pre-lithium in a pre-lithiation production line of a pole piece provided in an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of a pre-lithium immersion insertion device in a pre-lithiation production line of a pole piece according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a lithium supplement device in a pole piece prelithiation production line provided in an embodiment of the present invention.

Icon: 100-pole piece pre-lithiation production line; 110-a lithium intercalation pre-device; 111-pre-lithium box; 112-a heating mechanism; 113-guide roll mechanism; 114-a heating layer; 115-an insulating layer; 116-a protective layer; 120-a bi-directional pump; 130-a cold storage device; 140-a cleaning device; 141-spraying initial washing mechanism; 142-a raffinate purge mechanism; 150-a liquid removal and drying device; 151-air knife liquid removing mechanism; 152-a drying mechanism; 160-lithium supplement device; 161-conductivity sensor; 162-lithium supplement box; 170-an unwinding device; 180-a winding device; 190-a storage tank; 200-a waste gas collecting and treating device; 210-a dust removal device; 300-pole piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment of the present invention provides a pole piece prelithiation production line 100 for prelithiating a pole piece 300. The cold-stored storage that can carry out lithium solution to realize the reuse of lithium solution, reduce pole piece 300 and expect lithium cost, reduce lithium cell manufacturing cost.

It should be noted that the pole piece prelithiation production line 100 is applied to lithium supplement for the negative electrode of the lithium ion battery, and the pole piece prelithiation production line 100 can supplement lithium for the negative electrode made of artificial graphite or a high-capacity silicon composite material to realize prelithiation of the negative electrode, so as to improve the energy density of the lithium ion battery.

The pole piece pre-lithiation production line 100 comprises a dipping and embedding pre-lithiation device 110, a bidirectional pump 120, a refrigerating device 130, a cleaning device 140, a liquid removal and drying device 150, a lithium supplement device 160, an unreeling device 170, a reeling device 180, a storage tank 190, an exhaust gas collection and treatment device 200 and a dust removal device 210. The refrigerating device 130 is connected with the lithium immersion insertion device 110 through the bidirectional pump 120, and the refrigerating device 130 is used for refrigerating and storing the lithium solution to prevent the lithium solution from losing efficacy in a short time at normal temperature, so that the lithium solution can be reused conveniently. The bidirectional pump 120 is used for pumping the lithium solution in the refrigerating device 130 into the lithium intercalation pre-impregnation device 110, so as to realize lithium intercalation pre-impregnation of the pole piece 300. The lithium immersion insertion pre-lithium device 110 is used for performing lithium immersion insertion pre-lithium on the pole piece 300 by using a lithium solution, that is, the pole piece 300 is immersed in the lithium solution, so as to realize pre-lithiation of the pole piece 300. The bidirectional pump 120 is further configured to pump the lithium solution in the lithium intercalation pre-lithiation device 110 into the refrigeration device 130 for storage after the pre-lithiation operation is completed, and wait for the next pre-lithiation. Therefore, when the pole piece 300 needs to be pre-lithium, the lithium solution is extracted from the refrigerating device 130, and the lithium solution is stored in the refrigerating device 130 after the pre-lithium is completed, so that the lithium solution can be reused, the pre-lithium cost of the pole piece 300 is reduced, and the production cost of the lithium battery is reduced.

It should be noted that the unwinding device 170 is connected to the immersion embedding pre-lithium device 110, the immersion embedding pre-lithium device 110 is connected to the liquid removing and drying device 150 through the cleaning device 140, one end of the winding device 180 is connected to the liquid removing and drying device 150 through the dust removing device 210, the other end is connected to the storage tank 190, and the exhaust gas collecting and processing device 200 is simultaneously connected to the unwinding device 170, the immersion embedding pre-lithium device 110, the cleaning device 140, the liquid removing and drying device 150 and the winding device 180. The unwinding device 170 is used for unwinding the pole piece 300; the lithium immersion and insertion device 110 is used for performing lithium immersion and insertion on the pole piece 300; the cleaning device 140 is used for cleaning the pole piece 300; the liquid removing and drying device 150 is used for removing liquid remained on the pole piece 300; the dust removing device 210 is used for removing dust impurities on the pole piece 300; the winding device 180 is used for winding the pole piece 300; the storage tank 190 is filled with inert gas, and the storage tank 190 is used for storing the pre-lithium pole piece 300 in an inert gas environment; the waste gas collecting and treating device 200 is used for collecting and treating waste gas, so that the waste gas is discharged to the outside after the environmental protection requirement reaches the standard.

In this embodiment, the lithium replenishing device 160 is connected to the lithium immersion insertion device 110, and the lithium replenishing device 160 is configured to replenish lithium ions into the lithium solution of the lithium immersion insertion device 110, so that the lithium concentration in the lithium solution is kept at a certain value, thereby ensuring the consistency of the pre-lithium of the pole piece 300. Specifically, the lithium content in the lithium solution is 0.5 mol/l, and the lithium replenishing device 160 can detect the lithium concentration in the lithium solution and replenish lithium ions to the lithium solution when the lithium concentration is lower than 0.5 mol/l.

Further, the lithium replenishing device 160 may replenish lithium ions by adding a high-concentration lithium solution to the lithium immersion and insertion device 110, or may replenish lithium ions by adding fine lithium simple substance particles to the lithium immersion and insertion device 110, and the manner of replenishing lithium from the lithium replenishing device 160 to the lithium immersion and insertion device 110 is not particularly limited.

It should be noted that the pole piece prelithiation production line 100 adopts a totally closed inert gas environment atmosphere, and each device module therein can be independently and totally closed when not in prelithiation operation, thereby facilitating maintenance and repair and reducing maintenance cost.

Specifically, the refrigerating device 130 is provided with a refrigerating cavity (not shown) for storing the lithium solution, the refrigerating cavity is filled with an inert gas, and the refrigerating temperature of the refrigerating device 130 ranges from-10 degrees celsius to 0 degrees celsius, that is, the refrigerating device 130 can refrigerate the lithium solution in an inert gas environment at the refrigerating temperature of from-10 degrees celsius to 0 degrees celsius, and this refrigerating manner can effectively preserve the lithium solution for at least 14 days, which is convenient for realizing the reutilization of the lithium solution. In this embodiment, the refrigerating temperature of the refrigerating device 130 is-5 degrees celsius, but the refrigerating temperature is not limited thereto, and in other embodiments, the refrigerating temperature of the refrigerating device 130 may be-10 degrees celsius or may be 0 degrees celsius, and the refrigerating temperature of the refrigerating device 130 is not particularly limited.

It should be noted that the unwinding device 170 is provided with a warm air heating component (not shown), a deviation rectifying component (not shown), and a tension adjusting component (not shown), wherein the warm air heating component is configured to blow out hot air to the pole piece 300, so that the temperature of the pole piece 300 is maintained within a range from 25 ℃ to 60 ℃, which is convenient for subsequent impregnation and lithium pre-insertion, the deviation rectifying component is configured to rectify the deviation of the pole piece 300 during the tape transport process, and the tension adjusting component is configured to adjust the tension of the pole piece 300.

The lithium pre-immersion device 110 includes a lithium pre-chamber 111, a heating mechanism 112, and a guide roller mechanism 113. The guide roller mechanism 113 is installed in the pre-lithium box 111, the pre-lithium box 111 is used for containing lithium solution, and the guide roller mechanism 113 is used for driving the pole piece 300 to move in a winding manner, so that the pole piece 300 with a larger length can be stored in the pre-lithium box 111, that is, the pole piece 300 with the larger length is immersed in the lithium solution at the same time, and therefore the pre-lithium efficiency of the pole piece 300 is improved. The heating mechanism 112 is connected with the pre-lithium box 111, and the heating mechanism 112 is used for heating the pre-lithium box 111, so that the pole piece 300 is soaked and embedded with pre-lithium at a preset temperature, and the pre-lithium effect is improved. The pre-lithium tank 111 is connected to a bi-directional pump 120 to facilitate refrigerated storage of the lithium solution.

Further, the process time of the lithium pre-intercalation of the pole piece 300 needs to be determined according to actual conditions, and if the process time of the lithium pre-intercalation of the pole piece 300 is short, the unwinding speed can be increased, or the winding degree can be reduced; if the process time of the lithium pre-intercalation of the pole piece 300 is longer, the unwinding speed can be slowed down, or the meandering degree can be improved.

It should be noted that the time of the lithium immersion embedding pre-process of the negative electrode plate made of different active materials is different, and the time of the lithium immersion embedding pre-process of the negative electrode plate with different surface densities is different. Specifically, a negative pole piece made of an artificial graphite material is soaked and embedded with pre-lithium for 2 minutes, and the pre-lithium first effect can reach 100%; the negative pole piece made of the high-capacity silicon composite material is soaked and embedded with pre-lithium for 5 minutes, and the first effect of the pre-lithium can reach 100%.

In this embodiment, the preset temperature is the same as the ambient temperature in the unwinding device 170, and is 25 to 60 degrees celsius, so as to ensure that the lithium pre-embedding effect of the pole piece 300 is good.

The pre-lithium tank 111 includes a heating layer 114, an insulating layer 115, and a protective layer 116. The protective layer 116 is sleeved outside the insulating layer 115, and the insulating layer 115 is sleeved outside the heating layer 114, that is, the heating layer 114, the insulating layer 115 and the protective layer 116 are sequentially arranged on the lithium pre-charging box 111 from inside to outside. The heating layer 114 is connected to the heating mechanism 112, and the heating mechanism 112 can heat the heating layer 114 to maintain the lithium solution contained in the heating layer 114 at a preset temperature. The heat preservation layer 115 is used for preserving heat of the heating layer 114 so as to ensure constant temperature of the pole piece 300 in the immersion embedding process. The protective layer 116 corresponds to the outer shell of the entire pre-lithium tank 111, and the protective layer 116 is used to prevent the pre-lithium tank 111 from being damaged by external force.

The cleaning device 140 includes a shower preliminary cleaning mechanism 141 and a residual liquid cleaning mechanism 142. The lithium pre-immersion device 110 is connected with a residual liquid cleaning mechanism 142 through a spraying primary cleaning mechanism 141, and the residual liquid cleaning mechanism 142 is connected with a liquid removing and drying device 150. The spraying primary cleaning mechanism 141 is used for primary cleaning of the pole piece 300, and the residual liquid cleaning mechanism 142 is used for secondary cleaning of the pole piece 300.

Specifically, when the pole piece 300 leaves the lithium immersion embedding device 110, a large amount of lithium solution is attached to the surface of the pole piece 300, and at this time, the spraying primary washing mechanism 141 is adopted to spray the pole piece 300 to remove the large amount of lithium solution on the surface of the pole piece 300, and waste liquid formed by spraying needs to be subjected to centralized recovery processing; after the primary cleaning is completed, the residual lithium solution is still attached to the surface of the pole piece 300, at this time, the secondary cleaning is performed on the pole piece 300 in a secondary spraying or soaking mode to remove the residual lithium solution on the surface of the pole piece 300, and the waste liquid formed by cleaning needs to be subjected to centralized recovery processing.

The liquid removing and drying device 150 includes an air knife liquid removing mechanism 151 and a drying mechanism 152. The cleaning device 140 is connected with the drying mechanism 152 through the air knife liquid removing mechanism 151, and the drying mechanism 152 is connected with the winding device 180 through the dust removing device 210. The air knife liquid removing mechanism 151 is used for blowing off liquid remained on the pole piece 300, and the drying mechanism 152 is used for drying the pole piece 300.

Specifically, when the pole piece 300 leaves the cleaning device 140, a large amount of organic reagent liquid is attached to the surface of the pole piece 300, and at this time, the air knife liquid removal mechanism 151 is adopted to purge the pole piece 300, so as to remove a large amount of organic reagent residual liquid on the surface of the pole piece 300; after the purging operation is completed, a small amount of organic reagent is remained on the surface of the pole piece 300 or inside the coating, and the drying mechanism 152 is adopted to dry the pole piece 300 at the moment so as to ensure that the output pole piece 300 is dry and tidy. Further, the drying temperature of the drying mechanism 152 ranges from 40 ℃ to 80 ℃, and the drying time ranges from 30 seconds to 10 minutes.

It should be noted that, in the pre-lithium process of the pole piece pre-lithiation production line 100, the unreeling device 170, the immersion pre-lithium device 110, the cleaning device 140, the liquid removing and drying device 150, and the reeling device 180 all generate waste gases with different concentrations. The exhaust gas collecting and processing device 200 is provided with gas detectors (not shown) in the unwinding device 170, the lithium immersion and embedding device 110, the cleaning device 140, the liquid removing and drying device 150, and the winding device 180, and the gas detectors are used for detecting the concentration of the volatile gas of the organic reagent. Specifically, when gaseous detector detected organic reagent volatile gas concentration and reached preset concentration, utilize waste gas collection processing apparatus 200 to collect these waste gases and concentrate and handle to realize partial inert gas's recovery and recycle, and reduce organic reagent volatile gas concentration below the flammable safe value, thereby guarantee that pole piece 300's prelithiation can not cause the influence to external environment, improve the security.

The lithium replenishing device 160 includes a conductivity sensor 161 and a lithium replenishing tank 162. The conductivity sensor 161 is installed in the lithium immersion insertion device 110, and is connected to a lithium replenishment tank 162, and the lithium replenishment tank 162 is used to store lithium ions. The conductivity sensor 161 is used for detecting the conductivity of the lithium solution in the lithium immersion insertion device 110, and controlling the lithium supplement box 162 to input lithium ions into the lithium immersion insertion device 110 when the conductivity is lower than a preset value, so that the lithium concentration in the lithium solution is kept at a certain value, and the consistency of the lithium pre-insertion of the pole piece 300 is ensured.

Specifically, the conductivity of the lithium solution is in a proportional relationship with the lithium concentration in the lithium solution, i.e., the greater the conductivity of the lithium solution, the higher the lithium concentration in the lithium solution, and the smaller the conductivity of the lithium solution, the lower the lithium concentration in the lithium solution. Thus, the function of keeping the lithium concentration in the lithium solution constant can be realized by detecting the conductivity of the lithium solution in real time.

In the pole piece prelithiation production line 100 provided by the embodiment of the invention, the refrigeration device 130 is connected with the dipping and embedding prelithiation device 110 through the bidirectional pump 120, the refrigeration device 130 is used for refrigerating and storing a lithium solution, the bidirectional pump 120 is used for pumping the lithium solution in the refrigeration device 130 into the dipping and embedding prelithiation device 110, the dipping and embedding prelithiation device 110 is used for dipping and embedding prelithiation on the pole piece 300 by using the lithium solution, the bidirectional pump 120 is also used for pumping the lithium solution in the dipping and embedding prelithiation device 110 into the refrigeration device 130 for storage after the prelithiation operation is completed, the dipping and embedding prelithiation device 110 is connected with the liquid removing and drying device 150 through the cleaning device 140, the cleaning device 140 is used for cleaning the pole piece 300, and the liquid removing and drying device 150 is used for removing residual liquid on the pole piece 300. Compared with the prior art, the pole piece pre-lithiation production line 100 provided by the invention adopts the refrigeration device 130 connected with the dipping and embedding pre-lithiation device 110 through the bidirectional pump 120, so that the refrigeration storage of the lithium solution can be carried out, the reutilization of the lithium solution is convenient, the pre-lithiation cost of the pole piece 300 is reduced, and the production cost of the lithium battery is reduced.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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.