Negative plate pre-lithiation equipment

Abstract

The invention provides negative plate pre-lithiation equipment which is arranged in a vacuum environment, and a first unwinding assembly and a first winding assembly of the negative plate pre-lithiation equipment are arranged on a rack and used for conveying a part to be pre-lithiated; the second unwinding assembly and the second winding assembly which are arranged on the rack are used for conveying the shielding piece; the cooling roller arranged on the rack is used for cooling the to-be-pre-lithiated part and the shielding part in the conveying process; the evaporation assembly is provided with an evaporation concave part, the evaporation concave part is used for containing to-be-evaporated metal, and the evaporation assembly is arranged below the cooling roller so as to evaporate the to-be-evaporated metal; wherein the to-be-pre-lithiated piece and the shielding piece are sequentially wound on the cooling roller, the shielding piece is located on the side, away from the cooling roller, of the to-be-pre-lithiated piece, and the shielding piece is provided with a hollow-out part and a shielding part, so that metal vapor generated after the to-be-evaporated metal is evaporated penetrates through the hollow-out part to be deposited on the to-be-pre-lithiated piece. According to the invention, the problem of low production efficiency of negative plate pre-lithiation in the prior art is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a negative electrode sheet pre-lithium device. Background Art

[0002] At present, with the increasing application of lithium-ion batteries, users have increasingly stringent requirements on the various performance of lithium-ion batteries, especially the energy density and cycle life of lithium-ion batteries. During the initial charge and discharge process of lithium-ion batteries, due to the formation of solid electrolyte membranes, a portion of lithium ions will be consumed, resulting in a low initial coulombic efficiency of lithium-ion batteries, affecting the overall capacity and life of the battery. For this reason, it is necessary to provide additional lithium sources to implement pre-lithiation technology. Pre-lithiation technology is used to pre-lithiate electrode materials such as pole pieces to compensate for the large amount of lithium ions consumed, which can effectively improve the reversible cycle capacity and cycle life of lithium batteries.

[0003] In the prior art, the pre-lithiation of lithium-ion batteries is usually carried out in three ways: chemical pre-lithiation, electrochemical pre-lithiation and negative electrode spraying of lithium powder. Chemical pre-lithiation is to pre-incorporate lithium ions into electrode materials by chemical methods; electrochemical pre-lithiation is to assemble the positive and negative electrodes that have not been pre-lithiated into a battery, and then achieve pre-lithiation by contacting the lithium metal sheet with the negative electrode current collector; negative electrode spraying of lithium powder is to disperse the metal lithium powder in an organic solvent and spray it on the negative electrode sheet, and complete the pre-lithiation of the negative electrode sheet after it dries.

[0004] However, in the actual production process, the chemicals used in chemical pre-lithiation are highly reactive, toxic and dangerous, requiring workers to take special protective measures; electrochemical pre-lithiation requires a long reaction time, and lithium metal sheets require high storage conditions; the process of spraying lithium powder on the negative electrode requires high dispersion and stability of lithium powder, and the distribution of lithium powder needs to be precisely controlled. The above methods make the pre-lithiation process of the negative electrode sheet more complicated, thereby reducing the production efficiency of the pre-lithiation of the negative electrode sheet. Summary of the invention

[0005] The main purpose of the present invention is to provide a negative electrode sheet pre-lithiation device to solve the problem of low production efficiency of negative electrode sheet pre-lithiation in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to the present invention, there is provided a negative electrode sheet pre-lithium device, which is arranged in a vacuum environment, and the negative electrode sheet pre-lithium device comprises: a frame; a first unwinding assembly and a first winding assembly arranged on the frame, the first unwinding assembly and the first winding assembly are used to convey the pre-lithium component; a second unwinding assembly and a second winding assembly are arranged on the frame, the second unwinding assembly and the second winding assembly are used to convey the shielding component; a cooling roller, which is arranged on the frame, the cooling roller is located between the first unwinding assembly and the first winding assembly, and between the second unwinding assembly and the second winding assembly, so as to cool the pre-lithium component and the shielding component during the conveying process; an evaporation assembly, which has an evaporation recess, the evaporation recess is used to accommodate the metal to be evaporated, and the evaporation assembly is arranged below the cooling roller to evaporate the metal to be evaporated; wherein the pre-lithium component and the shielding component are orderly wound on the cooling roller, the shielding component is located on the side of the pre-lithium component away from the cooling roller, and the shielding component has a hollow part and a shielding part, so that the metal vapor after the metal to be evaporated is evaporated passes through the hollow part and is deposited on the pre-lithium component.

[0007] Furthermore, the first unwinding assembly includes a first unwinding roller, the first winding assembly includes a first winding roller, the second unwinding assembly includes a second unwinding roller, the second winding assembly includes a second winding roller, and the negative electrode sheet pre-lithium equipment also includes: at least two pressure detection devices, at least two pressure detection devices are respectively arranged on the first unwinding roller and the second unwinding roller to detect the surface tension of the pre-lithium component and the shielding component; a control device, which is connected to the pressure detection device, the first unwinding roller, the first winding roller, the second unwinding roller and the second winding roller, and the control device controls the rotation speed of the first unwinding roller and the second unwinding roller according to the detection data of the pressure detection device; and / or the control device controls the rotation speed of the first winding roller and the second winding roller according to the detection data of the pressure detection device.

[0008] Furthermore, the rotational speeds of the first unwinding roller and the second unwinding roller are consistent, and the rotational speeds of the first winding roller and the second winding roller are consistent.

[0009] Furthermore, the negative electrode sheet pre-lithiation equipment also includes a heating roller, which is arranged on the frame and located between the cooling roller and the first winding assembly to heat the pre-lithiation parts during the transportation process.

[0010] Furthermore, the negative electrode sheet pre-lithium equipment also includes a cooling component, which is arranged on the frame and located between the heating roller and the first winding component to cool the pre-lithium parts during the transportation process.

[0011] Furthermore, the cooling assembly includes at least two cooling structures arranged opposite to each other, and a cooling space is formed between the at least two cooling structures. When the lithium pre-treatment component passes through the cooling space, the cooling structure cools the lithium pre-treatment component.

[0012] Furthermore, the cooling assembly also includes a driving structure, at least one cooling structure is movably arranged, and the driving structure is drivingly connected to the cooling structure to adjust the size of the cooling space in the process of driving the cooling structure to move toward or away from another cooling structure.

[0013] Furthermore, the negative electrode sheet pre-lithium equipment also includes a first roller, which is rotatably arranged on the frame and located between the first unwinding assembly and the first winding assembly, and the first roller is used for winding the workpiece to be pre-lithium; wherein, there are multiple first rollers, and the multiple first rollers are arranged at intervals along the conveying direction of the workpiece to be pre-lithium.

[0014] Furthermore, the negative electrode sheet pre-lithium equipment also includes a second roller, which is rotatably arranged on the frame and located between the second unwinding assembly and the second winding assembly, and the second roller is used for winding the shielding member; wherein, there are multiple second rollers, and the multiple second rollers are arranged at intervals along the conveying direction of the shielding member.

[0015] Furthermore, the negative electrode sheet pre-lithium equipment also includes a guide roller, which is arranged on the frame and located between the first unwinding assembly and the cooling roller to guide the pre-lithium parts during the transportation process.

[0016] According to the technical solution of the present invention, the negative electrode sheet pre-lithium equipment is arranged in a vacuum environment, and the first unwinding assembly and the first winding assembly of the negative electrode sheet pre-lithium equipment are arranged on a frame, and the first unwinding assembly and the first winding assembly are used to convey the pre-lithium part. The second unwinding assembly and the second winding assembly arranged on the frame are used to convey the shielding member. The cooling roller is arranged on the frame, and the cooling roller is located between the first unwinding assembly and the first winding assembly, and between the second unwinding assembly and the second winding assembly, so as to cool the pre-lithium part and the shielding member during the conveying process. The evaporation assembly has an evaporation recess, and the evaporation recess is used to accommodate the metal to be evaporated. The evaporation assembly is arranged below the cooling roller to evaporate the metal to be evaporated. Among them, the pre-lithium part and the shielding member are arranged on the cooling roller in an orderly manner, and the shielding member is located on the side of the pre-lithium part away from the cooling roller, and the shielding member has a hollow part and a shielding part, so that the metal vapor after the metal to be evaporated passes through the hollow part and is deposited on the pre-lithium part. In this way, the staff winds the negative electrode sheet on the first unwinding assembly on the cooling roller and the first winding assembly in sequence, and then winds the mask on the second unwinding assembly on the cooling roller and the first winding assembly in sequence. Afterwards, the lithium is heated by the evaporation assembly until it evaporates. After evaporation, the lithium rises and passes through the hollow part of the mask to be deposited on the negative electrode sheet, forming a layer of lithium film. Afterwards, the mask is wound up by the second winding assembly, and the pre-lithiated negative electrode sheet is wound up by the first winding assembly, thereby completing a pre-lithiation cycle of the negative electrode sheet. The above arrangement ensures the uniformity of pre-lithiation while reducing manual intervention, reducing the difficulty and danger of operation for staff, and improving production efficiency, thereby solving the problem of low production efficiency of pre-lithiation of negative electrode sheets in the prior art. At the same time, the mask is set up in such a way that lithium vapor can only be deposited on the negative electrode sheet through the hollow part, ensuring the accuracy of pre-lithiation; at the same time, the cooling roller is set up in such a way that the heat of the negative electrode sheet and the mask in the high-temperature evaporation environment is reduced, avoiding the deformation and damage of the negative electrode sheet and the mask due to heat, thereby extending the service life of the negative electrode sheet and the mask, and ensuring the smooth transportation of the negative electrode sheet and the mask, further improving the production efficiency of pre-lithiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 The overall structural schematic diagram of an embodiment of a negative electrode sheet pre-lithium device according to the present invention is shown;

[0019] Figure 2 A partial structural stereogram of an embodiment of a negative electrode sheet pre-lithium device according to the present invention is shown.

[0020] The above drawings include the following reference numerals:

[0021] 1. Part to be pre-lithium-treated; 2. Shielding part; 201. Hollow part; 202. Shielding part;

[0022] 11. first unwinding assembly; 111. first unwinding roller; 12. first winding assembly; 121. first winding roller;

[0023] 21. second unwinding assembly; 211. second unwinding roller; 22. second winding assembly; 221. second winding roller;

[0024] 30. Cooling roller;

[0025] 40. Evaporation assembly;

[0026] 50. Heating roller;

[0027] 60. Cooling assembly; 61. Cooling structure; 62. Cooling space;

[0028] 70. First roller;

[0029] 80, second roller;

[0030] 90. Guide roller. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0033] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0034] In order to solve the problem of low production efficiency of negative electrode sheet pre-lithiation in the prior art, the present application provides a negative electrode sheet pre-lithiation device.

[0035] like Figure 1 and Figure 2As shown, the negative electrode sheet pre-lithium equipment is arranged in a vacuum environment, and the negative electrode sheet pre-lithium equipment includes a frame, a first unwinding assembly 11, a first winding assembly 12, a second unwinding assembly 21, a second winding assembly 22, and a cooling and evaporation assembly 40. The first unwinding assembly 11 and the first winding assembly 12 arranged on the frame are used to convey the pre-lithium component 1. The second unwinding assembly 21 and the second winding assembly 22 arranged on the frame are used to convey the shielding member 2. The cooling roller 30 is arranged on the frame, and the cooling roller 30 is located between the first unwinding assembly 11 and the first winding assembly 12, and between the second unwinding assembly 21 and the second winding assembly 22, so as to cool the pre-lithium component 1 and the shielding member 2 during the conveying process. The evaporation assembly 40 has an evaporation recess, and the evaporation recess is used to accommodate the metal to be evaporated. The evaporation assembly 40 is arranged below the cooling roller 30 to evaporate the metal to be evaporated. Among them, the lithium-prepared part 1 and the shielding part 2 are wound on the cooling roller 30 in order, and the shielding part 2 is located on the side of the lithium-prepared part 1 away from the cooling roller 30. The shielding part 2 has a hollow part 201 and a shielding part 202, so that the metal vapor after the metal to be evaporated is evaporated passes through the hollow part 201 and is deposited on the lithium-prepared part 1.

[0036] Applying the technical solution of this embodiment, the negative electrode sheet pre-lithium equipment is arranged in a vacuum environment, and the first unwinding assembly 11 and the first winding assembly 12 of the negative electrode sheet pre-lithium equipment are arranged on the frame, and the first unwinding assembly 11 and the first winding assembly 12 are used to convey the pre-lithium part 1. The second unwinding assembly 21 and the second winding assembly 22 arranged on the frame are used to convey the shielding member 2. The cooling roller 30 is arranged on the frame, and the cooling roller 30 is located between the first unwinding assembly 11 and the first winding assembly 12, and between the second unwinding assembly 21 and the second winding assembly 22, so as to cool the pre-lithium part 1 and the shielding member 2 during the conveying process. The evaporation assembly 40 has an evaporation recess, and the evaporation recess is used to accommodate the metal to be evaporated. The evaporation assembly 40 is arranged below the cooling roller 30 to evaporate the metal to be evaporated. Among them, the lithium-prepared part 1 and the shielding part 2 are wound on the cooling roller 30 in order, and the shielding part 2 is located on the side of the lithium-prepared part 1 away from the cooling roller 30. The shielding part 2 has a hollow part 201 and a shielding part 202, so that the metal vapor after the metal to be evaporated passes through the hollow part 201 and is deposited on the lithium-prepared part 1. In this way, the staff winds the negative electrode sheet on the first unwinding component 11 on the cooling roller 30 and the first winding component 12 in sequence, and then winds the mask on the second unwinding component 21 on the cooling roller 30 and the first winding component 12 in sequence. After that, the lithium is heated by the evaporation component 40 until it evaporates. After evaporation, the lithium rises and passes through the hollow part 201 of the mask and is deposited on the negative electrode sheet to form a layer of lithium film. Afterwards, the mask is rolled up by the second winding assembly 22, and the pre-lithiated negative electrode sheet is rolled up by the first winding assembly 12, thereby completing a pre-lithiation cycle of the negative electrode sheet. The above arrangement ensures the uniformity of pre-lithiation while reducing manual intervention, reducing the difficulty and danger of operation for staff, improving production efficiency, and ensuring the continuous production of pre-lithiation of the negative electrode sheet, thereby solving the problem of low production efficiency of pre-lithiation of the negative electrode sheet in the prior art. At the same time, the arrangement of the mask allows lithium vapor to be deposited on the negative electrode sheet only through the hollow portion 201, ensuring the accuracy of pre-lithiation; at the same time, the arrangement of the cooling roller 30 reduces the heat of the negative electrode sheet and the mask in a high-temperature evaporation environment, avoiding deformation and damage of the negative electrode sheet and the mask due to heating, extending the service life of the negative electrode sheet and the mask, and ensuring the smoothness of the transportation of the negative electrode sheet and the mask, further improving the production efficiency of pre-lithiation.

[0037] In this embodiment, the component to be pre-lithiated 1 is a negative electrode sheet.

[0038] In this embodiment, the shielding member 2 is a mask.

[0039] In this embodiment, the metal to be evaporated is lithium.

[0040] Optionally, a resistance wire is wound inside the evaporation component 40 to heat the lithium through the resistance wire.

[0041] Optionally, the evaporation assembly 40 is provided with an induction coil to heat the lithium by generating an induced current.

[0042] In this embodiment, the vacuum degree of the vacuum environment is 0.005 Pa to ensure that lithium can achieve a state of continuous evaporation.

[0043] Optionally, the vacuum environment is provided with an inert gas to prevent the lithium from reacting.

[0044] Optionally, the vacuum environment is a high vacuum environment to prevent lithium from reacting.

[0045] In this embodiment, the mask and the negative electrode sheet are both attached to the cooling roller. Compared with the traditional shielding member setting method, it can ensure that lithium vapor is evenly deposited on the negative electrode sheet. The shape of the deposited lithium film can match the hollow part of the mask, avoiding the subsequent cutting process due to the inconsistency between the shape of the lithium film and the set shape, reducing the labor intensity of the staff and improving work efficiency.

[0046] In this embodiment, the shape of the hollow portion 201 can be adjusted; and / or the temperature T of the cooling roller 30 satisfies: -30°≤T≤30°. In this way, the staff can control the deposition area of ​​lithium vapor by changing the shape of the hollow portion 201 to adapt to the requirements of batteries of different specifications and sizes, thereby improving the versatility and flexibility of the negative electrode sheet pre-lithiation equipment. At the same time, the temperature setting of the cooling roller 30, on the one hand, during the process of pre-lithiation of the negative electrode sheet, cools down the negative electrode sheet and the mask above the evaporation component 40, thereby avoiding thermal deformation and burning of the negative electrode sheet and the mask due to excessive temperature, thereby extending the service life of the negative electrode sheet and the mask; on the other hand, the cooling temperature of the cooling roller 30 is more appropriate, thereby avoiding damage to the negative electrode sheet due to sudden temperature changes, thereby further ensuring the quality of the negative electrode sheet. At the same time, the above-mentioned setting of the temperature of the cooling roller 30 makes the temperature of the cooling roller 30 more flexible and diverse, thereby improving the cooling flexibility and versatility of the cooling roller 30.

[0047] In this embodiment, the hollow portion 201 is arranged in a rectangular shape.

[0048] Optionally, the hollow portion 201 is circular, elliptical or polygonal.

[0049] Specifically, the first unwinding assembly 11 includes a first unwinding roller 111, the first winding assembly 12 includes a first winding roller 121, the second unwinding assembly 21 includes a second unwinding roller 211, the second winding assembly 22 includes a second winding roller 221, and the negative electrode pre-lithium equipment also includes at least two pressure detection devices and a control device. At least two pressure detection devices are respectively arranged on the first unwinding roller 111 and the second unwinding roller 211 to detect the surface tension of the pre-lithium component 1 and the mask. The control device is connected to the pressure detection device, the first unwinding roller 111, the first winding roller 121, the second unwinding roller 211 and the second winding roller 221, and the control device controls the rotation speed of the first unwinding roller 111 and the second unwinding roller 211 according to the detection data of the pressure detection device; and / or, the control device controls the rotation speed of the first winding roller 121 and the second winding roller 221 according to the detection data of the pressure detection device. In this way, the control device regulates the rotation speed of the first unwinding roller 111, the first winding roller 121, the second unwinding roller 211 and the second winding roller 221 by real-time monitoring the detection data of the pressure detection device, thereby ensuring the stability of the tension during the transportation of the negative electrode sheet and the mask, thereby improving the transportation reliability of the negative electrode sheet and the mask. At the same time, the above-mentioned setting also improves the automation level of the negative electrode sheet pre-lithium equipment, reduces the work difficulty and intensity of the staff, and improves the work efficiency. At the same time, the above-mentioned setting can also control the thickness of the lithium film by controlling the rotation speed of the first unwinding roller 111, the first winding roller 121, the second unwinding roller 211 and the second winding roller 221 to adapt to the specifications of different batteries, further improving the versatility of the negative electrode sheet pre-lithium equipment.

[0050] Specifically, the first unwinding roller 111 and the second unwinding roller 211 rotate at the same speed, and the first winding roller 121 and the second winding roller 221 rotate at the same speed. In this way, the first unwinding roller 111 and the second unwinding roller 211 rotate at the same speed, and the first winding roller 121 and the second winding roller 221 rotate at the same speed, so that the negative electrode sheet and the mask can always be kept in a state of being attached during the transportation process, thereby ensuring the reliability of the pre-lithiation of the negative electrode sheet.

[0051] In this embodiment, the first unwinding assembly 11 also includes a motor, which is drivingly connected to the first unwinding roller 111 to drive the first unwinding roller 111 to rotate. The control module is connected to the motor to control the speed of the motor and thereby control the rotation of the first unwinding roller 111.

[0052] In this embodiment, the first winding assembly 12 also includes a motor, which is drivingly connected to the first winding roller 121 to drive the first winding roller 121 to rotate. The control module is connected to the motor to control the speed of the motor and thereby control the rotation of the first winding roller 121.

[0053] In this embodiment, the second unwinding assembly 21 also includes a motor, which is drivingly connected to the second unwinding roller 211 to drive the second unwinding roller 211 to rotate. The control module is connected to the motor to control the speed of the motor and thereby control the rotation of the second unwinding roller 211.

[0054] In this embodiment, the second winding assembly 22 also includes a motor, which is drivingly connected to the second winding roller 221 to drive the second winding roller 221 to rotate. The control module is connected to the motor to control the speed of the motor and thereby control the rotation of the second winding roller 221.

[0055] Specifically, the tension F1 during the conveyance of the negative electrode sheet satisfies: 50N≤F1≤300N, so that the negative electrode sheet is closely attached to the outer surface of the cooling roller 30 .

[0056] Specifically, the tension F2 during the mask conveying process satisfies: 50N≤F2≤300N, so that the mask is closely attached to the outer surface of the negative electrode sheet.

[0057] In this embodiment, the cooling roller 30 has a bias adsorption function, which can ensure the reliability of the bonding between the negative electrode sheet and the cooling roller 30 .

[0058] like Figure 1 and Figure 2 As shown, the negative electrode sheet pre-lithium equipment also includes a heating roller 50, which is arranged on the frame and located between the cooling roller 30 and the first winding assembly 12, so as to heat the pre-lithium piece 1 during the conveying process. In this way, after the negative electrode sheet after evaporation pre-lithium is rapidly cooled by the cooling roller 30, the surface of the negative electrode sheet after lithium plating is prone to metal internal stress, resulting in dark lines and cracks on the surface of the lithium film. The above-mentioned setting of the heating roller 50 can reduce the internal stress of the lithium film on the surface of the negative electrode sheet after cooling, reduce the generation of dark lines and cracks on the surface of the lithium film, ensure that the combination between the lithium film and the negative electrode sheet is more stable, and improve the quality of the pre-lithium negative electrode sheet.

[0059] like Figure 1 and Figure 2 As shown, the negative electrode sheet pre-lithiation equipment also includes a cooling assembly 60, which is arranged on the frame and located between the heating roller 50 and the first winding assembly 12, so as to cool the pre-lithiation piece 1 during the conveying process. In this way, after the negative electrode sheet heated by the heating roller 50 is cooled by the cooling assembly 60, the temperature of the negative electrode sheet reaches a normal temperature state, which is conducive to the first winding assembly 12 to wind up the pre-lithiation negative electrode sheet, and also avoids the excessive temperature during the winding process, which causes the lithium film to generate internal stress, resulting in dark lines and cracks on the surface of the lithium film, and further ensures the quality of the pre-lithiation negative electrode sheet.

[0060] like Figure 1 and Figure 2 As shown, the cooling assembly 60 includes at least two cooling structures 61 arranged opposite to each other, and a cooling space 62 is formed between at least two cooling structures 61. When the lithium-prepared component 1 passes through the cooling space 62, the cooling structure 61 cools the lithium-prepared component 1. In this way, the cooling assembly 60 cools the negative electrode sheet through the cooling structure 61. At the same time, the above-mentioned setting of the cooling structure 61 enables both sides of the negative electrode sheet to be cooled, thereby expanding the contact area between the negative electrode sheet and the cooling structure 61 and improving the cooling efficiency of the cooling assembly 60.

[0061] In this embodiment, the number of cooling structures 61 is two.

[0062] It should be noted that the number of cooling structures 61 is not limited thereto, and can be adjusted according to working conditions and usage requirements. Optionally, the number of cooling structures 61 is three, four, six, eight, nine, or more.

[0063] Specifically, the cooling assembly 60 further includes a driving structure, at least one cooling structure 61 is movably arranged, and the driving structure is drivingly connected to the cooling structure 61, so as to adjust the size of the cooling space 62 in the process of driving the cooling structure 61 to move toward or away from another cooling structure 61. In this way, the above arrangement enables the cooling assembly 60 to adapt to negative electrode sheets of different specifications and sizes, improves the cooling versatility of the cooling assembly 60, and also improves the versatility of the negative electrode sheet pre-lithium equipment.

[0064] like Figure 1 and Figure 2 As shown, the negative electrode sheet pre-lithium equipment also includes a first roller 70, which is rotatably disposed on the frame and is located between the first unwinding assembly 11 and the first winding assembly 12, and the first roller 70 is used for winding the pre-lithium component 1. There are multiple first rollers 70, and the multiple first rollers 70 are arranged at intervals along the conveying direction of the pre-lithium component 1. In this way, the arrangement of the multiple first rollers 70 ensures the stability and smoothness of the conveying of the negative electrode sheet, and avoids damage to the negative electrode sheet due to unstable conveying. At the same time, the above arrangement also balances the force on the negative electrode sheet during the conveying process, further ensuring the quality of the negative electrode sheet.

[0065] In this embodiment, the number of the first rollers 70 disposed between the first unwinding assembly 11 and the first winding assembly 12 is three.

[0066] It should be noted that the number of first rollers 70 located between the first unwinding component 11 and the first winding component 12 is not limited to this, and can be adjusted according to working conditions and usage requirements. Optionally, the number of first rollers 70 located between the first unwinding component 11 and the first winding component 12 is four, six, eight, nine, or more.

[0067] like Figure 1 and Figure 2 As shown, the negative electrode sheet pre-lithium equipment also includes a second roller 80, which is rotatably arranged on the frame and located between the second unwinding assembly 21 and the second winding assembly 22, and the second roller 80 is used for winding the shielding member 2. There are multiple second rollers 80, and the multiple second rollers 80 are arranged at intervals along the conveying direction of the shielding member 2. In this way, the arrangement of multiple second rollers 80 ensures the stability and smoothness of the mask conveying, and avoids damage to the mask due to unstable conveying. At the same time, the above arrangement also balances the force on the mask during the conveying process, ensuring the quality of the mask.

[0068] In this embodiment, the number of second rollers 80 disposed between the second unwinding assembly 21 and the second winding assembly 22 is four.

[0069] It should be noted that the number of second rollers 80 located between the second unwinding component 21 and the second winding component 22 is not limited to this, and can be adjusted according to working conditions and usage requirements. Optionally, the number of second rollers 80 located between the second unwinding component 21 and the second winding component 22 is three, or six, or eight, or nine, or more.

[0070] like Figure 1 and Figure 2 As shown, the negative electrode sheet pre-lithium equipment also includes a guide roller 90, which is arranged on the frame and located between the first unwinding assembly 11 and the cooling roller 30 to guide the pre-lithium component 1 during the conveying process. In this way, during the conveying process of the negative electrode sheet, the guide roller 90 can guide the negative electrode sheet to ensure the conveying accuracy of the negative electrode sheet, improve the conveying efficiency of the negative electrode sheet, and avoid the negative electrode sheet from being offset during the conveying process, which causes wrinkles and damage to the negative electrode sheet, and further ensures the quality of the negative electrode sheet.

[0071] Specifically, the staff first unwinds the negative electrode sheet from the first unwinding assembly 11 and sequentially winds it around the first roller 70, the guide roller 90, the cooling roller 30, the first roller 70 and the heating roller 50, then passes through the cooling space 62 and winds it around the first roller 70, and then winds it around the first winding assembly 12. After that, the staff unwinds the mask from the second unwinding assembly 21, and sequentially winds it around the second roller 80, the cooling roller 30 and the second roller 80, and then winds it around the second winding assembly 22. After that, the evaporation assembly 40 is started to evaporate lithium, and lithium vapor is evaporated onto the negative electrode sheet.

[0072] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0073] The negative electrode sheet pre-lithium equipment is arranged in a vacuum environment, and the first unwinding assembly and the first winding assembly of the negative electrode sheet pre-lithium equipment are arranged on the frame, and the first unwinding assembly and the first winding assembly are used to convey the pre-lithium part. The second unwinding assembly and the second winding assembly arranged on the frame are used to convey the shielding member. The cooling roller is arranged on the frame, and the cooling roller is located between the first unwinding assembly and the first winding assembly, and between the second unwinding assembly and the second winding assembly, so as to cool the pre-lithium part and the shielding member during the conveying process. The evaporation assembly has an evaporation recess, and the evaporation recess is used to accommodate the metal to be evaporated. The evaporation assembly is arranged below the cooling roller to evaporate the metal to be evaporated. Among them, the pre-lithium part and the shielding member are orderly wound on the cooling roller, and the shielding member is located on the side of the pre-lithium part away from the cooling roller, and the shielding member has a hollow part and a shielding part, so that the metal vapor after the metal to be evaporated passes through the hollow part and is deposited on the pre-lithium part. In this way, the staff winds the negative electrode sheet on the first unwinding assembly on the cooling roller and the first winding assembly in sequence, and then winds the mask on the second unwinding assembly on the cooling roller and the first winding assembly in sequence. Afterwards, the lithium is heated by the evaporation assembly until it evaporates. After evaporation, the lithium rises and passes through the hollow part of the mask to be deposited on the negative electrode sheet, forming a layer of lithium film. Afterwards, the mask is wound up by the second winding assembly, and the pre-lithiated negative electrode sheet is wound up by the first winding assembly, thereby completing a pre-lithiation cycle of the negative electrode sheet. The above arrangement ensures the uniformity of pre-lithiation while reducing manual intervention, reducing the difficulty and danger of operation for staff, and improving production efficiency, thereby solving the problem of low production efficiency of pre-lithiation of negative electrode sheets in the prior art. At the same time, the mask is set up in such a way that lithium vapor can only be deposited on the negative electrode sheet through the hollow part, ensuring the accuracy of pre-lithiation; at the same time, the cooling roller is set up in such a way that the heat of the negative electrode sheet and the mask in the high-temperature evaporation environment is reduced, avoiding the deformation and damage of the negative electrode sheet and the mask due to heat, thereby extending the service life of the negative electrode sheet and the mask, and ensuring the smooth transportation of the negative electrode sheet and the mask, further improving the production efficiency of pre-lithiation.

[0074] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0075] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A negative electrode sheet pre-lithium equipment, arranged in a vacuum environment, characterized in that: The negative electrode sheet pre-lithium equipment comprises: frame; A first unwinding assembly (11) and a first winding assembly (12) are arranged on the frame, wherein the first unwinding assembly (11) and the first winding assembly (12) are used to convey the part to be pre-processed (1); a second unwinding assembly (21) and a second winding assembly (22) arranged on the frame, wherein the second unwinding assembly (21) and the second winding assembly (22) are used to convey the shielding member (2); a cooling roller (30) disposed on the frame, the cooling roller (30) being located between the first unwinding assembly (11) and the first winding assembly (12), and between the second unwinding assembly (21) and the second winding assembly (22), so as to cool the pre-liquidation component (1) and the shielding component (2) during the conveying process; An evaporation component (40) having an evaporation recess, the evaporation recess being used to accommodate the metal to be evaporated, the evaporation component (40) being arranged below the cooling roller (30) to evaporate the metal to be evaporated; The component to be pre-lithium-formed (1) and the shielding member (2) are arranged in order on the cooling roller (30); the shielding member (2) is located on a side of the component to be pre-lithium-formed (1) away from the cooling roller (30); and the shielding member (2) has a hollow portion (201) and a shielding portion (202), so that the metal vapor after the metal to be evaporated passes through the hollow portion (201) and is deposited on the component to be pre-lithium-formed (1).

2. The negative electrode sheet pre-lithium equipment according to claim 1, characterized in that: The first unwinding assembly (11) comprises a first unwinding roller (111), the first winding assembly (12) comprises a first winding roller (121), the second unwinding assembly (21) comprises a second unwinding roller (211), the second winding assembly (22) comprises a second winding roller (221), and the negative electrode sheet pre-lithium equipment further comprises: At least two pressure detection devices, wherein the at least two pressure detection devices are respectively arranged on the first unwinding roller (111) and the second unwinding roller (211) to detect the surface tension of the pre-lithium component (1) and the shielding component (2); A control device is connected to the pressure detection device, the first unwinding roller (111), the first winding roller (121), the second unwinding roller (211) and the second winding roller (221), and the control device controls the rotation speed of the first unwinding roller (111) and the second unwinding roller (211) according to the detection data of the pressure detection device; and / or the control device controls the rotation speed of the first winding roller (121) and the second winding roller (221) according to the detection data of the pressure detection device.

3. The negative electrode sheet pre-lithium equipment according to claim 2, characterized in that: The rotational speeds of the first unwinding roller (111) and the second unwinding roller (211) are consistent, and the rotational speeds of the first winding roller (121) and the second winding roller (221) are consistent.

4. The negative electrode sheet pre-lithium equipment according to claim 1, characterized in that: The negative electrode sheet pre-lithium equipment further comprises a heating roller (50), which is arranged on the frame and located between the cooling roller (30) and the first winding assembly (12) to heat the pre-lithium component (1) during the conveying process.

5. The negative electrode sheet pre-lithium equipment according to claim 4, characterized in that: The negative electrode sheet pre-lithium equipment further comprises a cooling assembly (60), wherein the cooling assembly (60) is arranged on the frame and located between the heating roller (50) and the first winding assembly (12) to cool the pre-lithium component (1) during the conveying process.

6. The negative electrode sheet pre-lithium equipment according to claim 5, characterized in that: The cooling assembly (60) comprises at least two cooling structures (61) arranged opposite to each other, a cooling space (62) being formed between the at least two cooling structures (61), and the cooling structures (61) cool the part (1) to be pre-lithium-treated while the part (1) to be pre-lithium-treated passes through the cooling space (62).

7. The negative electrode sheet pre-lithium equipment according to claim 6, characterized in that: The cooling assembly (60) also includes a driving structure, at least one of the cooling structures (61) is movably arranged, and the driving structure is drivingly connected to the cooling structure (61) so as to adjust the size of the cooling space (62) in the process of driving the cooling structure (61) to move toward or away from another cooling structure (61).

8. The negative electrode sheet pre-lithium equipment according to claim 1, characterized in that: The negative electrode sheet pre-lithium equipment also includes a first roller (70), which is rotatably arranged on the frame and located between the first unwinding assembly (11) and the first winding assembly (12), and the first roller (70) is used for winding the pre-lithium component (1); wherein the first roller (70) is multiple, and the multiple first rollers (70) are arranged at intervals along the conveying direction of the pre-lithium component (1).

9. The negative electrode sheet pre-lithium equipment according to claim 8, characterized in that: The negative electrode sheet pre-lithium equipment also includes a second roller (80), which is rotatably arranged on the frame and located between the second unwinding assembly (21) and the second winding assembly (22), and the second roller (80) is used for winding the shielding member (2); wherein the second roller (80) is multiple, and the multiple second rollers (80) are arranged at intervals along the conveying direction of the shielding member (2).

10. The negative electrode sheet pre-lithium equipment according to claim 1, characterized in that: The negative electrode sheet pre-lithium equipment further comprises a guide roller (90), which is arranged on the frame and located between the first unwinding assembly (11) and the cooling roller (30) to guide the pre-lithium component (1) during the conveying process.

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