Baseband pretreatment assembly for transferring lithium to pole piece and lithium transfer printing system

Abstract

The utility model relates to a base band pretreatment assembly for transferring lithium to a pole piece and a lithium transfer printing system, belongs to the technical field of lithium battery production, and solves the technical problems that lithium attached to a base band is consumed and is difficult to transfer to the pole piece due to the fact that the base band contains water. The base band pretreatment assembly comprises a first unwinding roller, a first winding roller and a calendaring roller set arranged between the first unwinding roller and the first winding roller, a base band is connected to the first unwinding roller, the first winding roller and the calendaring roller set in a winding mode, and the base band is provided with a bearing face used for attaching lithium; the heating part is arranged between the first unwinding roller and the calendering roller group and is used for heating the bearing surface of the base band; and the smearing part is arranged between the heating part and the calendering roller group and is used for smearing a release agent with a hydrophobic function on the bearing surface. A lithium transfer system includes a baseband pretreatment assembly. When the system is used for producing a lithium-containing pole piece, the use amount of metal lithium can be saved, oxidation of a lithium layer after transfer printing is reduced, the lithium metal embedding amount of the pole piece is improved, the battery capacity is improved, and the cost is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery production, and particularly relates to a baseband pretreatment component and a lithium transfer system for transferring lithium to a pole piece. Background Art

[0002] In the production process of solid-state lithium batteries, a very thin layer of lithium is usually set on both sides of the battery pole piece with the help of a lithium transfer system. Specifically, the lithium transfer system in the prior art is provided with a baseband retracting assembly, a pole piece retracting assembly, a calendering roller assembly and a transfer roller assembly. The baseband for carrying lithium is retracted by the baseband retracting assembly, and the baseband is wound around the calendering roller assembly. The lithium is attached to the bearing surface of the baseband after being thinned by the calendering roller assembly, and then moves to the transfer roller assembly as the baseband is reeled. The pole piece is retracted by the pole piece retracting assembly, and the pole piece and the baseband attached with lithium are both wound around the transfer roller assembly. Therefore, at the transfer roller assembly, the lithium attached to the bearing surface of the baseband will be transferred to the surface of the pole piece. At present, two baseband retracting assemblies are provided in the lithium transfer system, which are used to retract two basebands respectively, and the two basebands are respectively attached with lithium metal during the working process. At the transfer roller assembly, the lithium metal of the two basebands is respectively transferred to the two sides of the pole piece.

[0003] The lithium metal transfer technology on the battery pole piece is relatively mature. However, in the actual use process, we often find that the thickness of the lithium layer on the pole piece is uneven, making it difficult to improve the quality of the pole piece. One reason for this problem is water molecules. Because the entire transfer process is not carried out in a dry vacuum, the water molecules in the air will inevitably dip into the surface of the base tape when the base tape is retracted and released. When the lithium is attached to the base tape bearing surface after rolling, the lithium contacts the water molecules on the surface of the base tape and consumes part of the lithium, and increases the adhesion of the lithium in this area to the base tape. As a result, during transfer, the amount of lithium in this area is less and it is more difficult to transfer to the pole piece, resulting in uneven thickness of the lithium layer on the pole piece. Utility Model Content

[0004] The utility model provides a base tape pretreatment component and a lithium transfer system for transferring lithium to a pole piece, which are used to solve the technical problem that the lithium attached to the base tape is consumed and difficult to be transferred to the pole piece due to water content in the base tape.

[0005] The utility model is realized by the following technical scheme: a baseband pretreatment component for transferring lithium to a pole piece comprises:

[0006] A first unwinding roller, a first winding roller, and a calendering roller group arranged between the first unwinding roller and the first winding roller, the base tape is wound around the first unwinding roller, the first winding roller, and the calendering roller group, and the base tape has a bearing surface for attaching lithium;

[0007] A heating unit is disposed between the first unwinding roller and the calendering roller group, and is used to heat the bearing surface of the base belt to remove water molecules on the bearing surface;

[0008] The coating part is arranged between the heating part and the calendering roller group, and is used for coating a release agent with a hydrophobic function on the bearing surface.

[0009] Furthermore, in order to better implement the present invention, it also includes:

[0010] The wiping part is arranged between the smearing part and the calendering roller group, and the wiping part is used to wipe part of the release agent on the carrying surface.

[0011] Furthermore, in order to better implement the present invention, the wiping part includes:

[0012] Wipe tape;

[0013] a second unwinding roller and a second winding roller, the wiping tape being wound between the second unwinding roller and the second winding roller so as to wind up and unwind the wiping tape using the second unwinding roller and the second winding roller;

[0014] A reversing roller, the wiping belt and the base belt are both wound around the reversing roller, and the base belt is located outside the wiping belt so that the bearing surface of the base belt contacts the wiping belt.

[0015] Furthermore, in order to better realize the utility model, the wiping belt is a structural member made of non-woven fabric, and the release agent is methyl silicone oil.

[0016] Furthermore, in order to better implement the present invention, the heating unit includes:

[0017] a housing having an air inlet and an air outlet;

[0018] a fan mounted at the air inlet to generate an air flow in the housing;

[0019] an electric heating rod installed in the housing to heat the air flow;

[0020] The air outlet faces the bearing surface of the base belt.

[0021] Furthermore, in order to better implement the present invention, the heating unit further includes:

[0022] A temperature sensor is installed on the housing, and is used to detect the temperature of the air flow blown out of the air outlet;

[0023] The temperature sensor, the fan and the electric heating rod are all electrically connected to a controller, wherein the controller controls the working state of the fan and / or the electric heating rod according to the detection data of the temperature sensor.

[0024] Furthermore, in order to better implement the present invention, the application part includes:

[0025] A smear roller, the interior of which is hollow to form a storage cavity for storing the release agent, a filling port connected to the storage cavity is provided on the end surface of the smear roller, and a plurality of evenly distributed discharge holes are provided on the circumferential side wall of the smear roller;

[0026] A plug, detachably mounted on the filling port, and used to seal the filling port;

[0027] The base belt is wound around the application roller.

[0028] Furthermore, in order to better implement the present invention, the application part further includes:

[0029] A roller sleeve made of nano-mesh cloth is sleeved on the coating roller and covers the discharge pores, and the bearing surface of the base belt contacts the roller sleeve.

[0030] Furthermore, in order to better realize the utility model, an air charging interface connected to the storage chamber is also provided on the end surface of the coating roller, and the air charging interface is connected to a dry nitrogen source through a pipeline to inject dry nitrogen into the storage chamber.

[0031] The lithium transfer assembly provided by the utility model comprises the above-mentioned base band pretreatment assembly for transferring lithium to the pole piece.

[0032] Compared with the prior art, the utility model has the following beneficial effects:

[0033] (1) The base tape pretreatment assembly for transferring lithium to the electrode provided by the utility model comprises a first unwinding roller, a first winding roller, a calendering roller group, a heating unit and a coating unit, wherein the calendering roller group is arranged between the first unwinding roller and the first winding roller, and the base tape is wound around the first unwinding roller, the first winding roller and the calendering roller group, so that the first unwinding roller and the first winding roller are used to rewind the above-mentioned base tape, and the base tape has a bearing surface for attaching lithium, and the base tape will pass through the calendering roller group during the rewinding and unwinding process. When in use, the lithium tape will reach the calendering roller group after being unwound from the lithium tape unwinding roller 8 and merge with the base tape there, and the calendering roller group will act to make the base tape The lithium belt is thinned to form a lithium layer and the lithium layer is rolled and attached to the bearing surface of the base belt. The heating part is arranged between the first unwinding roller and the calendering roller group. The heating part generates heat, thereby heating the bearing surface of the base belt that has not reached the calendering roller group, and then removing the water molecules on the bearing surface of the base belt. The coating part is arranged between the heating part and the calendering roller group. The coating part is used to coat a release agent with a hydrophobic function on the bearing surface of the base belt, thereby coating the release agent with a hydrophobic function on the bearing surface of the base belt after heating and removing water and before reaching the calendering roller group, thereby preventing the water molecules in the air from adhering to the bearing surface of the base belt after heating and removing water.

[0034] Through the above structure, the base tape pretreatment component removes water molecules on the bearing surface of the base tape with the help of the heating part, and applies a release agent on the bearing surface of the base tape from which the water molecules are removed with the help of the coating part. The release agent has a hydrophobic function. In this way, it can be ensured that the bearing surface of the base tape reaching the calendering roller group is free of water. When the lithium tape is rolled onto the water-free bearing surface of the base tape by the calendering roller group, the lithium layer is actually attached to the surface of the release agent layer instead of directly contacting the bearing surface, thereby ensuring that the lithium tape will not be consumed by contacting water molecules on the base tape. In addition, the adhesion of lithium at various locations on the base tape to the release agent layer is closer, and lithium is easier to fall off from the release agent layer, so that the lithium in the transfer process can be more easily transferred from the base tape to the surface of the electrode. In this way, it can be effectively ensured that the thickness of the lithium layer at various locations on the electrode is more uniform, the consistency is better, and the quality of the produced electrode is also higher.

[0035] (2) The lithium transfer assembly provided by the utility model includes the above-mentioned baseband pretreatment assembly for transferring lithium to the electrode. The baseband used for transferring lithium to the electrode is collected and processed by the above-mentioned baseband pretreatment assembly. In this way, the lithium attached to the baseband after calendering will not be consumed, and it is easier to transfer from the baseband to the surface of the electrode, effectively ensuring that the thickness of the lithium layer at various locations on the electrode is more uniform and more consistent, and the quality of the produced electrode is also higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of a baseband pretreatment assembly for transferring lithium to an electrode provided in Example 1 of the utility model;

[0038] Figure 2 It is a schematic diagram of the structure of the heating unit in Embodiment 1 of the present utility model;

[0039] Figure 3 It is a schematic diagram of the structure of the application part in Embodiment 1 of the present utility model;

[0040] Figure 4 It is a schematic structural diagram of the wiping portion in Embodiment 1 of the present utility model;

[0041] Figure 5 It is a structural schematic diagram of the lithium transfer system provided in Example 2 of the present utility model.

[0042] In the figure:

[0043] 1-first unwinding roller, 2-first winding roller, 3-calendering roller group, 4-base belt, 41-bearing surface, 5-heating part, 51-housing, 52-fan, 53-electric heating rod, 54-temperature sensor, 6-applying part, 61-applying roller, 611-filling port, 612-discharging hole, 613-inflating interface, 62-roller cover, 7-wiping part, 71-wiping belt, 72-second unwinding roller, 73-second winding roller, 74-reversing Roller, 8-lithium tape unwinding shaft, 9-third unwinding shaft, 10-protective film, 11-third winding shaft, 12-pass roller, 13-temperature measuring head, 14-fourth unwinding roller, 15-pole piece, 16-fourth winding roller, 17-drying and cooling component, 18-transfer roller group, 19-tension detection component, 20-tension control component, 21-fifth unwinding roller, 22-copper foil, 23-fifth winding roller, 24-low-temperature drying chamber, 25-lithium tape. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0045] Embodiment 1:

[0046] The utility model provides a baseband pretreatment component for transferring lithium to a pole piece. Figure 1 and Figure 5 As shown, it includes a first unwinding roller 1, a first winding roller 2, a calendering roller group 3, a heating part 5 and a coating part 6, wherein:

[0047] The base tape 4 is a flexible belt structure for attaching lithium, and the base tape 4 is wound between the first unwinding roller 1 and the first winding roller 2, so that the first unwinding roller 1 and the first winding roller 2 constitute a winding roller group of the base tape 4, so as to retract and unwind the base tape 4. Specifically, when the first winding roller 2 rotates, the base tape 4 is gradually transferred from the first unwinding roller 1 to the first winding roller 2. The side of the base tape 4 for attaching lithium is defined as the bearing surface 41.

[0048] The calendering roller group 3 includes two calendering rollers arranged side by side, and a calendering gap is formed between the two calendering rollers. The above-mentioned base belt 4 is wound around the calendering roller group 3. Specifically, the base belt 4 is wound around one of the calendering rollers in the calendering roller group 3 and the base belt 4 passes through the above-mentioned calendering gap. In this way, the base belt 4 will pass through the calendering roller group 3 during the winding and unwinding process. When used specifically, the lithium belt 25 will also reach the calendering gap of the calendering roller group 3 after being unwound from the lithium belt unwinding roller 8 and merge with the base belt 4 there. The lithium belt 25 is rolled by the action of the calendering roller group 3 (specifically, the calendering roller group 3 rotates), so that the lithium belt 25 is thinned to form a lithium layer and the lithium layer is rolled and attached to the bearing surface 41 of the base belt 4.

[0049] The heating unit 5 is arranged between the first unwinding roller 1 and the calendering roller group 3, and the heating unit 5 is in contact with or non-contact with the bearing surface 41 of the above-mentioned base belt 4. The heating unit 5 can generate heat, and the heat acts on the base belt 4, thereby heating the bearing surface 41 of the base belt 4 that has not reached the calendering roller group 3, and then evaporating and removing water molecules on the bearing surface 41 of the base belt 4.

[0050] The coating part 6 is arranged between the heating part 5 and the calendering roller group 3, and the coating part 6 contacts the bearing surface 41 of the base belt 4. The coating part 6 is used to coat the release agent with a hydrophobic function on the bearing surface 41 of the base belt 4 to form a layer of release agent on the bearing surface 41 of the base belt 4, so that the release agent with a hydrophobic function is coated on the bearing surface 41 of the base belt 4 after heating and dehydrating and before reaching the calendering roller group 3, thereby preventing water molecules in the air from adhering to the bearing surface 41 of the base belt 4 after heating and dehydrating.

[0051] Through the above structure, the base tape pretreatment component removes water molecules on the bearing surface 41 of the base tape 4 with the help of the heating part 5, and applies a release agent on the bearing surface 41 of the base tape 4 from which the water molecules are removed with the help of the coating part 6. The release agent has a hydrophobic function, so that it can be ensured that the bearing surface 41 of the base tape 4 reaching the calendering roller group 3 is dry. When the lithium tape 25 is rolled on the dry bearing surface 41 of the base tape 4 by the calendering roller group 3, the lithium layer is actually attached to the surface of the release agent layer, rather than directly contacting the bearing surface 41, to ensure that the lithium tape 25 will not be consumed by contacting with water molecules on the base tape 4, and the adhesion of lithium at various locations on the base tape 4 to the release agent layer is closer, and lithium is easier to fall off from the release agent layer, so that the lithium in the transfer process can be more easily transferred from the base tape 4 to the surface of the electrode 15, so that it can be effectively ensured that the thickness of the lithium layer at various locations on the electrode 15 is more uniform, the consistency is better, and the quality of the produced electrode 15 is also higher.

[0052] Optionally, the release agent with hydrophobic function is methyl silicone oil, and of course, the release agent can also be silicone resin, etc. Of course, a hydrophobic film or paper can also be used instead of the release agent, and the coating part 6 at this time is to stick the hydrophobic film or paper on the bearing surface 41 of the base belt 4.

[0053] Optionally, the calendering roller of the calendering roller group 3 is actually a roller shaft with a flow channel inside, and a cooling medium (such as cooling water or cooling oil or cold air) can be passed into the flow channel to ensure that the calendering roller can dissipate heat well. It should be noted that the process of calendering the lithium strip 25 onto the base strip 4 will generate a lot of heat. Therefore, the calendering roller is set as a roller shaft with a cooling function, which can well dissipate the heat generated by calendering the lithium onto the base strip 4, avoiding the high temperature from affecting the adhesion effect of lithium on the base strip 4 and causing damage to the lithium on the base strip 4. Of course, it is a conventional technology for the calendering roller to dissipate heat during the calendering process, so it will not be described in more detail here.

[0054] Optionally, a third unwinding shaft 9 and a third winding shaft 11 for retracting and unwinding the protective film 10 are also provided. The third unwinding protective film 10 is wound between the third unwinding shaft 9 and the third winding shaft 11. When the third winding shaft 11 rotates, the protective film 10 can be driven to move from the third unwinding shaft 9 to the third winding shaft 11. The protective film 10 also passes through the calendering gap of the calendering roller group 3. The base band 4 and the protective film 10 are respectively wound around two calendering rollers in the calendering roller group 3. The lithium band 25 is located between the base band 4 and the protective film 10. In this way, the protective film 10 can be used to avoid direct contact between the lithium band 25 and the roller surface of one of the calendering rollers, thereby preventing lithium from adhering to the roller surface of the calendering roller. Of course, the use of the protective film 10 to achieve the above-mentioned isolation function during the lithium transfer process is a prior art, so it will not be described in more detail here.

[0055] Optionally, the distance between the heating portion 5 and / or the coating portion 6 and the bearing surface 41 of the base belt 4 is adjustable, that is, the heating portion 5 and / or the coating portion 6 are installed on the mounting plate through an adjusting component (not shown in the figure) (it should be noted that the first unwinding roller 1, the first winding roller 2, the calendering roller group 3, the third unwinding roller, and the fourth unwinding roller 14 in this embodiment are all rotatably installed on the same side surface of the mounting plate). With the help of the adjusting component, the heating portion 5 and / or the coating portion 6 can be conveniently adjusted according to the thickness and other dimensions of the base belt 4. For example, the adjustment component in this embodiment may include a guide rail installed on a mounting plate, a slider slidably installed on the guide rail, and a clamping bolt arranged between the slider and the guide rail. The above-mentioned heating part 5 and / or the application part 6 are connected to the slider, and a handle is arranged on the slider to facilitate manual operation by the operator. A threaded hole is provided on the slider, and the clamping bolt is screwed into the threaded hole. When it is necessary to adjust the heating part 5 and / or the application part 6 to a suitable position, the clamping bolt is tightened. At this time, the clamping bolt is pressed against the outer wall of the guide rail, thereby locking the slider on the guide rail, and then locking the distance between the heating part 5 and / or the application part 6 and the bearing surface 41 of the base belt 4. When adjustment is required, the clamping bolt is loosened, and then the handle is held by hand for operation. As another implementation of this embodiment, the adjustment component in this embodiment may also include a mounting block for mounting the heating part 5 and / or the coating part 6 and a power part for driving the mounting block to move linearly. The power part may be a linear motor or a cylinder or an electric telescopic rod, etc. In the process of driving the mounting block to move linearly, the distance between the heating part 5 and / or the coating part 6 and the bearing surface 41 of the base belt 4 is changed.

[0056] After the lithium is pressed and attached to the base tape 4, the first winding roller 2 continues to rotate and drives it to move to the transfer roller group 18 and transfer and attach to the surface of the electrode 15. The transfer process will be described below.

[0057] The optional implementation of this embodiment is as follows: Since too thick a release agent on the bearing surface 41 will not only affect the adhesion of lithium to the base tape 4, but also waste materials, in order to control the thickness of the release agent on the base tape 4, in this embodiment, a wiping portion 7 is further provided between the above-mentioned coating portion 6 and the above-mentioned calendering roller group 3. The wiping portion 7 is used to wipe part of the release agent attached to the bearing surface 41 of the base tape 4. Of course, no matter what erasing method is used, the release agent cannot be completely wiped off, but only part of the release agent can be wiped off. After erasing, an extremely thin layer (thickness of 0.1-0.2μm) of release agent layer will always flow down on the bearing surface 41.

[0058] Optionally, the wiping portion 7 in this embodiment is as follows Figure 4 As shown, it includes a wiping belt 71, a second unwinding roller 72, a second winding roller 73 and a reversing roller 74, wherein:

[0059] The wiping belt 71 is a flexible belt structure, which is wound between the second unwinding roller 72 and the second winding roller 73, so that the second unwinding roller 72 and the second winding roller 73 can be used to retract the wiping belt 71. The wiping belt 71 is also wound around the reversing roller 74, so that the reversing roller 74 can reverse the wiping belt 71. The base belt 4 is also wound around the reversing roller 74, and the base belt 4 is located outside the wiping belt 71, and the bearing surface 41 of the base belt 4 is in contact with the wiping belt 71. Optionally, the wiping belt 71 in this embodiment is a structural member made of non-woven fabric. Of course, the wiping belt 71 can also be composed of a belt and a sponge adhered to the belt, and the sponge is in contact with the bearing surface 41.

[0060] When the second winding roller 73 is winding, the wiping tape 71 is unwound from the second unwinding roller 72 and moves toward the second winding roller 73, thereby driving the reversing roller 74 to rotate. At the same time, the base tape 4 is also moved toward the above-mentioned calendering roller group 3 under the action of the first winding roller 2. Since the bearing surface 41 of the base tape 4 is in contact with the wiping tape 71, the wiping tape 71 will take away part of the release agent applied on the bearing surface 41, thereby forming a wiping effect.

[0061] As another optional implementation of this embodiment, the wiping portion 7 in this embodiment may also include a fixed block and a wiping sponge or textile mounted on the fixed block, the wiping sponge or textile is in contact with the bearing surface 41 of the base belt 4, and when the first winding roller 2 drives the base belt 4 to move, the wiping sponge or textile is used to wipe the release agent on the bearing surface 41. Of course, a scraper may also be used instead of the wiping sponge or textile. In this case, the fixed block may also be mounted on the mounting plate through an adjustment component, so as to facilitate adjustment of the distance between the fixed block and the bearing surface 41.

[0062] The optional implementation of this embodiment is as follows: the heating unit 5 is as follows: Figure 2 As shown, it includes a housing 51, a fan 52 and an electric heating rod 53. The housing 51 has an air inlet and an air outlet. The fan 52 is installed at the air inlet. When the fan 52 is running, it can generate an air flow in the housing 51, and finally generate wind at the air outlet and finally blow the wind out of the air outlet. The electric heating rod 53 is installed in the housing 51, so that the electric heating rod 53 is used to heat the air flow in the housing 51, so that the wind blown out of the air outlet is hot air. The air outlet is facing the bearing surface 41 of the base band 4. In this way, the blown hot air is directly blown onto the bearing surface 41, so that the bearing surface 41 is dried by the hot air. In this case, the heating part 5 is non-contact with the bearing surface 41 of the base band 4. It is easy to understand that the heating part 5 in the above form is actually a hot air blower 52, which uses hot air to heat and dry the bearing surface 41 of the base band 4. The heating part 5 of this structure has the advantages of simple structure and low cost.

[0063] Of course, the heating unit 5 may also be an electromagnetic heater, an induction heater, a light wave tube heater, an infrared heater, etc. that can achieve non-contact heating.

[0064] In addition, the heating unit 5 may also include an electric heating plate, which is in direct contact with the carrying surface 41 of the base tape 4. In this case, the heating unit 5 and the carrying surface 41 of the carrier tape are heated in a contact manner.

[0065] Regardless of the heating method, the heating unit 5 only needs to be able to heat the supporting surface 41 of the base tape 4 so as to evaporate the water molecules on the supporting surface 41 of the base tape 4 .

[0066] This embodiment is explained by taking the heating part 5 formed by the above-mentioned hot air blower 52 as an example. More preferably, in this embodiment, a temperature sensor 54 is also installed on the above-mentioned shell 51. The temperature sensor 54 is used to detect the temperature of the air flow blown out of the air outlet, and the temperature sensor 54, the fan 52 and the electric heating rod 53 are all electrically connected to the controller (such as a circuit board, a control chip, etc.), wherein the controller controls the working state of the fan 52 and / or the electric heating rod 53 according to the detection data of the temperature sensor 54, thereby automatically controlling the air outlet temperature of the heating part 5 to avoid the air outlet temperature being too high to damage the base belt 4 or too low to achieve the effect of drying the bearing surface 41 of the base belt 4.

[0067] The optional implementation of this embodiment is as follows: Figure 3 As shown, it includes a coating roller 61 and a plug (not shown in the figure), wherein:

[0068] The smear roller 61 is a roller shaft, and the interior of the smear roller 61 is hollow to form a storage cavity for storing the release agent. A filling port 611 connected to the storage cavity is provided on the end face of the smear roller 61, so that the release agent can be injected into the storage cavity, and a plurality of evenly distributed discharge holes 612 are provided on the circumferential side wall of the smear roller 61, so that the release agent in the storage cavity can be discharged from the smear roller 61. A plug is installed on the filling port 611 or screwed to the filling port 611, so that the filling port 611 is blocked when the release agent does not need to be added. The base belt 4 is wound around the smear roller 61, and the base belt 4 is located below the smear roller 61, so that the bearing surface 41 of the base belt 4 is in direct contact with the roller surface of the smear roller 61. In this way, when the base belt 4 moves, the base belt 4 will drive the smear roller 61 to rotate, and the release agent in the smear roller 61 will flow out from the discharge holes 612 under the action of factors such as centrifugal force or gravity and be smeared on the bearing surface 41 of the base belt 4. Of course, an additional motor and transmission system can also be provided to drive the smear roller 61 to rotate automatically.

[0069] In order to make the release agent coming out of the discharge hole 612 be more evenly applied on the bearing surface 41 of the base belt 4, and to prevent the release agent coming out of the discharge hole 612 from being scattered everywhere, in this embodiment, a roller sleeve 62 made of nano-mesh cloth is mounted on the coating roller 61, and the roller sleeve 62 covers the discharge hole 612, and the bearing surface 41 of the base belt 4 contacts the roller sleeve 62. The roller sleeve 62 made of nano-mesh cloth allows the fluid to pass through and has a certain retention effect on the fluid. The release agent coming out of the discharge hole 612 reaches the roller sleeve 62 and is retained in the roller sleeve 62. At the contact portion between the roller sleeve 62 and the base belt 4, the base belt 4 squeezes the roller sleeve 62, so that the release agent is pressed out of the roller sleeve 62 and adheres to the bearing surface 41 of the base belt 4, thereby achieving the effect of applying the release agent on the bearing surface 41 of the base belt 4.

[0070] In order to make the release agent in the coating roller 61 flow out from the discharge hole 612 more evenly and smoothly, in this embodiment, an air charging interface 613 connected to the storage chamber is also provided on the end surface of the coating roller 61, and the air charging interface 613 is connected to the dry nitrogen source through a pipeline to inject dry nitrogen into the storage chamber, so as to use the dry nitrogen to squeeze the release agent in the storage chamber, so that the release agent can flow out from the discharge hole 612 more evenly and smoothly. Specifically, the dry nitrogen source can be a high-pressure nitrogen bottle, and the pipeline is provided with an electromagnetic throttle valve electrically connected to the controller or a manually controlled mechanical throttle valve to control the amount of nitrogen injected into the storage chamber per unit time, thereby controlling the speed at which the release agent flows out of the discharge hole 612.

[0071] Embodiment 2:

[0072] The utility model can also be a lithium transfer system for transferring lithium to the pole piece 15 of the lithium battery, such as Figure 5 As shown, the lithium transfer system includes the base tape pretreatment component for transferring lithium to the electrode provided in Example 1, and utilizes the base tape pretreatment component for transferring lithium to the electrode to receive and process the base tape 4 with lithium attached thereto.

[0073] Of course, in order to attach lithium layers to both opposite side walls of the pole piece 15, the lithium transfer system provided in this embodiment actually includes two sets of the above-mentioned base tape pretreatment components for transferring lithium to the pole piece, and the base tapes 4 of the two sets of the components both carry lithium layers, and finally the lithium layers are transferred and attached to the two opposite side walls of the pole piece 15 at the transfer roller group 18. Specifically:

[0074] The lithium transfer system further includes a fourth unwinding roller 14 and a fourth winding roller 16 , and the pole piece 15 is wound around the fourth unwinding roller 14 and the fourth winding roller 16 , so that the fourth unwinding roller 14 and the fourth winding roller 16 are used to wind up the pole piece 15 .

[0075] It also includes a transfer roller group 18 composed of two transfer rollers arranged side by side, a transfer gap is formed between the two transfer rollers, two base belts 4 with lithium layers attached are respectively wound around the two transfer rollers and are both located in the transfer gap, the bearing surfaces 41 of the two base belts 4 are away from the corresponding transfer rollers, and the pole piece 15 is connected in the transfer gap and is located between the bearing surfaces 41 of the two base belts 4. During operation, the lithium layers on the two base belts 4 are respectively transferred and attached to the two opposite outer walls of the pole piece 15 by the rolling action of the transfer roller (specifically, the rotation of the transfer roller).

[0076] In fact, after the lithium layer is transferred and attached to the pole piece 15, the lithium will gradually embed into the surface of the pole piece 15, and a large amount of heat will be generated in this process. Therefore, the transfer roller in this embodiment is also a roller shaft with a flow channel, and a cooling medium (such as cooling water, cooling oil or cooling air) flows in the flow channel, so as to dissipate the heat generated in the transfer process to avoid the heat generated in the transfer process from damaging the lithium layer on the surface of the pole piece 15. Of course, a plurality of temperature measuring heads 13 are arranged around the transfer roller group 18, and the temperature measuring heads 13 are electrically connected to the above-mentioned controller, so as to use the temperature measuring heads 13 to measure the temperature of the transfer roller group 18 and the pole piece 15 attached with lithium, so as to facilitate the user to timely understand the temperature of the transfer roller group 18 and the pole piece 15 attached with lithium, and the flow rate and temperature of the cooling medium flowing in the transfer roller can be controlled according to the temperature.

[0077] In addition, a plurality of drying, cooling and cooling components 17 are provided on the path where the base tape 4 with the lithium layer attached travels to the transfer roller group 18 and on the path where the pole piece 15 with the lithium layer transferred is wound from the transfer roller group 18 to the fourth winding roller 16, so as to cool down the lithium layer attached to the base tape 4 and the lithium layer attached to the pole piece 15. The drying, cooling and cooling component 17 can be a cold air outlet device, which is connected to the air conditioner, so that the cold air outlet device can spray cold air, thereby using the sprayed cold air to air-cool the base tape 4 with the lithium layer attached and the pole piece 15 with the lithium layer attached. Of course, the above-mentioned drying, cooling and cooling component 17 can also be any other form of refrigeration component, as long as it can cool down the base tape 4 with the lithium layer attached and the pole piece 15 with the lithium layer attached.

[0078] The tension during the recovery process of the pole piece 15 has a great influence on the lithium transfer effect of the lithium layer on the pole piece 15. Therefore, the lithium transfer system provided in this embodiment also includes a tension detection component 19 and a tension control component 20. The tension detection component 19 is arranged between the fourth winding roller 16 and the transfer roller group 18, and the tension control component 20 is arranged between the tension detection component 19 and the fourth winding roller 16. The tension detection component 19 and the tension control component 20 are both in contact with the pole piece 15 with the lithium layer attached, so as to detect the tension of the pole piece 15 with the lithium layer attached during the winding process and adjust the tension of the pole piece 15 during the winding process. Among them, the tension detection component 19 can be a belt tension detector in the prior art, and the tension control component 20 can be a roller driven to move by a power mechanism, and the pole piece 15 with the lithium layer attached is wound around the roller. The power mechanism can be a linear motor, a cylinder or an electric telescopic rod, etc., which can output linear motion. The above roller is installed at the power output end of the power mechanism. The above-mentioned tension detection component 19 and tension control component 20 are both electrically connected to the controller, so that the controller controls the operation of the tension control component 20 according to the detection data of the tension detection component 19, and specifically controls the operation of the power mechanism to change the position of the roller, thereby changing the tension of the pole piece 15 wound around the roller.

[0079] It also includes a fifth unwinding roller 21 and a fifth winding roller 23, and the copper foil 22 is wound around the fifth unwinding roller 21, the fifth winding roller 23 and the fourth winding roller 16. In this way, when the fourth winding roller 16 winds up the pole piece 15 with the lithium layer attached, a layer of copper foil 22 is attached to the pole piece 15, so as to achieve a better heat dissipation effect. In addition, the fourth winding roller 16 is located in a low-temperature drying chamber 24, so that the pole piece 15 wound on the fourth winding roller 16 is in a low-temperature dry environment. In this way, the pole piece 15 with the lithium layer attached can be further cooled to avoid damage to the lithium layer and the pole piece 15 caused by high temperature.

[0080] In addition, the lithium transfer system also includes a plurality of rollers 12 for supporting the base tape 4 and the pole piece 15 .

[0081] It is worth noting that in the lithium transfer system provided in this embodiment, except for the above-mentioned baseband pretreatment component for transferring lithium to the electrode which is different from the prior art, the rest, such as the fourth winding roller 16, the fourth unwinding roller 14, the temperature measuring head 13, the transfer roller group 18, the drying and cooling component 17, the transfer roller group 18, the tension detection component 19, the tension control component 20, the fifth winding roller 23, the fifth unwinding roller 21 and the selection, setting method, setting position and function of the roller 12 are the same as those in the prior art, so they will not be described in more detail here.

[0082] Through the above structure, the base tape 4 is heated to remove water before lithium is attached, and the bearing surface 41 is coated with a release agent with a hydrophobic function, so that the lithium attached to the base tape 4 after calendering will not be consumed, and it is easier to transfer from the base tape 4 to the surface of the pole piece 15, effectively ensuring that the thickness of the lithium layer at various locations on the pole piece 15 is more uniform, and in conjunction with the existing cooling and cooling means, the base tape 4 with the lithium layer attached and the pole piece 15 with the lithium layer attached are heat-dissipated and cooled, so that the lithium layer is cooled faster on the base tape 4 and the pole piece 15, reducing the oxidation amount of the lithium layer and avoiding spontaneous combustion of the lithium layer. Therefore, the lithium transfer system provided in this embodiment can save the amount of metallic lithium when producing lithium-containing pole pieces 15, reduce the oxidation of the lithium layer after transfer, increase the amount of lithium metal embedded in the pole piece 15 of the solid-state battery, increase the battery capacity, effectively reduce costs, and improve factory efficiency.

[0083] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope recorded in the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A baseband pretreatment component for transferring lithium to a pole piece, characterized in that: include: A first unwinding roller (1), a first winding roller (2), and a calendering roller group (3) arranged between the first unwinding roller (1) and the first winding roller (2), the base belt (4) being wound around the first unwinding roller (1), the first winding roller (2), and the calendering roller group (3), and the base belt (4) having a bearing surface (41) for attaching lithium; A heating unit (5) is arranged between the first unwinding roller (1) and the calendering roller group (3), and the heating unit (5) is used to heat the bearing surface (41) of the base belt (4) to remove water molecules on the bearing surface (41); The smearing part (6) is arranged between the heating part (5) and the calendering roller group (3), and the smearing part (6) is used to smear a release agent having a hydrophobic function onto the bearing surface (41).

2. The base tape pretreatment assembly for transferring lithium to a pole piece according to claim 1, characterized in that: Also includes: A wiping portion (7) is arranged between the smearing portion (6) and the calendering roller group (3), and the wiping portion (7) is used to wipe a portion of the release agent on the bearing surface (41).

3. The base tape pretreatment assembly for transferring lithium to a pole piece according to claim 2, characterized in that: The wiping portion (7) comprises: Wiping belt (71); a second unwinding roller (72) and a second winding roller (73), the wiping belt (71) being wound between the second unwinding roller (72) and the second winding roller (73), so that the wiping belt (71) can be wound and released by using the second unwinding roller (72) and the second winding roller (73); A reversing roller (74), the wiping belt (71) and the base belt (4) are both wound around the reversing roller (74), and the base belt (4) is located outside the wiping belt (71) so that the bearing surface (41) of the base belt (4) is in contact with the wiping belt (71).

4. The base tape pretreatment assembly for transferring lithium to a pole piece according to claim 3, characterized in that: The wiping belt (71) is a structural member made of non-woven fabric, and the release agent is methyl silicone oil.

5. The base tape pretreatment assembly for transferring lithium to a pole piece according to any one of claims 1 to 4, characterized in that: The heating unit (5) comprises: A housing (51) having an air inlet and an air outlet; a fan (52) mounted at the air inlet to generate an air flow in the housing (51); An electric heating rod (53) installed in the housing (51) to heat the air flow; The air outlet faces the bearing surface (41) of the base belt (4).

6. The base tape pretreatment assembly for transferring lithium to a pole piece according to claim 5, characterized in that: The heating unit (5) further comprises: A temperature sensor (54) is installed on the housing (51), and the temperature sensor (54) is used to detect the temperature of the air flow blown out of the air outlet; The temperature sensor (54), the fan (52) and the electric heating rod (53) are all electrically connected to a controller, wherein the controller controls the working state of the fan (52) and / or the electric heating rod (53) according to the detection data of the temperature sensor (54).

7. The base tape pretreatment assembly for transferring lithium to a pole piece according to any one of claims 1 to 4, characterized in that: The smearing part (6) comprises: A smear roller (61) is hollow inside to form a storage cavity for storing the release agent, a filling port (611) connected to the storage cavity is provided on the end surface of the smear roller (61), and a plurality of evenly distributed discharge holes (612) are provided on the circumferential side wall of the smear roller (61); A plug, detachably mounted on the filling port (611), the plug being used to seal the filling port (611); The base belt (4) is wound around the coating roller (61).

8. The base tape pretreatment assembly for transferring lithium to a pole piece according to claim 7, characterized in that: The smearing part (6) further comprises: A roller sleeve (62) made of nano-mesh cloth, the roller sleeve (62) is sleeved on the coating roller (61) and covers the discharge pores, and the bearing surface (41) of the base belt (4) is in contact with the roller sleeve (62).

9. The substrate pretreatment assembly for transferring lithium to a pole piece according to claim 8, characterized in that: An air charging interface (613) in communication with the material storage chamber is also provided on the end surface of the coating roller (61); the air charging interface (613) is connected to a dry nitrogen source via a pipeline so as to inject dry nitrogen into the material storage chamber.

10. Lithium transfer system, characterized in that: It comprises a substrate pretreatment component for transferring lithium to a pole piece as described in any one of claims 1 to 9.

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