Negative plate pre-lithiation equipment

Abstract

The utility model 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 are used for conveying parts 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. The negative plate pre-lithiation device effectively solves the problem of low production efficiency of negative plate pre-lithiation in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, specifically, relate to a kind of negative pole piece prelithiation equipment. BACKGROUND

[0002] At present, with the more and more widely application of lithium ion battery, the user's performance requirements of lithium ion battery are more and more strict, especially the energy density and cycle life of lithium ion battery. In the initial charging and discharging process of lithium ion battery, due to the formation of solid electrolyte membrane, a part of lithium ion will be consumed, so as to cause the low first coulomb efficiency of lithium ion battery, which affects the overall capacity and life of the battery. Therefore, it is necessary to provide additional lithium source to realize the prelithiation technology, and the electrode material such as pole piece is prelithiated by the prelithiation technology, so as to make up for the consumption of a large number of lithium ions, which can effectively improve the reversible cycle capacity and cycle life of lithium battery.

[0003] In the prior art, the prelithiation of lithium ion battery usually adopts three ways of chemical prelithiation, electrochemical prelithiation and negative electrode spraying lithium powder. The chemical prelithiation is to precombine lithium ion into electrode material by chemical method; the electrochemical prelithiation is to assemble the positive and negative electrodes which have not been prelithiated into a battery, and then realize prelithiation by contacting lithium metal sheet with negative electrode current collector; the negative electrode spraying lithium powder is to disperse metal lithium powder in organic solvent and spray it on the negative pole piece, and then complete the prelithiation of the negative pole piece after drying.

[0004] However, in the actual production process, the chemicals used in chemical prelithiation have high reactivity, toxicity and danger, and special protective measures are required for the staff; in the electrochemical prelithiation, a long reaction time is required, and the lithium metal sheet needs a high storage condition; in the process of negative electrode spraying lithium powder, the dispersibility and stability of lithium powder are required to be high, and the distribution of lithium powder needs to be accurately controlled. The above-mentioned methods result in a complex prelithiation process of negative pole piece, thereby reducing the production efficiency of negative pole piece prelithiation. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a kind of negative pole piece prelithiation equipment to solve the problem of low production efficiency of negative pole piece prelithiation in prior art.

[0006] In order to achieve the above object, the utility model provides a negative plate prelithium equipment is arranged in the vacuum environment, and the negative plate prelithium equipment includes: rack, first unwinding assembly and first winding assembly are set up on the rack, and first unwinding assembly and first winding assembly are used to transport the prelithium piece, second unwinding assembly and second winding assembly are set up on the rack, and second unwinding assembly and second winding assembly are used to transport the shielding piece, cooling roller is set up on the rack, and the cooling roller is located between first unwinding assembly and first winding assembly and is located between second unwinding assembly and second winding assembly to cool the prelithium piece and the shielding piece in the conveying process, evaporation assembly has evaporation recess, and the evaporation recess is used to accommodate the metal to be evaporated, and the evaporation assembly is set below the cooling roller to evaporate the metal to be evaporated, wherein the prelithium piece and the shielding piece are orderly arranged on the cooling roller, the shielding piece is located on the side away from the cooling roller of the prelithium piece, and the shielding piece 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 prelithium piece.

[0007] Further, 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 plate prelithium equipment further includes: at least two pressure detection devices, the 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 prelithium piece and the shielding piece; a control device connected with the pressure detection devices, the first unwinding roller, the first winding roller, the second unwinding roller and the second winding roller, the control device controls the rotating speed of the first unwinding roller and the second unwinding roller according to the detection data of the pressure detection devices; and / or the control device controls the rotating speed of the first winding roller and the second winding roller according to the detection data of the pressure detection devices.

[0008] Further, the rotating speed of the first unwinding roller and the second unwinding roller is consistent, and the rotating speed of the first winding roller and the second winding roller is consistent.

[0009] Further, the negative plate prelithium equipment further includes a heating roller, the heating roller is arranged on the rack and located between the cooling roller and the first winding assembly to heat the prelithium piece in the conveying process.

[0010] Further, the negative plate prelithium equipment further includes a cooling assembly, the cooling assembly is arranged on the rack and located between the heating roller and the first winding assembly to cool the prelithium piece in the conveying process.

[0011] Further, the cooling assembly includes at least two oppositely arranged cooling structures, a cooling space is formed around the at least two cooling structures, and the cooling structure cools the prelithium piece in the process of passing through the cooling space.

[0012] Further, the cooling assembly further comprises a driving structure, and the at least one cooling structure is movably arranged, and the driving structure is drivingly connected with the cooling structure, so as to adjust the size of the cooling space during driving the cooling structure to move towards or away from the other cooling structure.

[0013] Further, the negative plate pre-lithiation device further comprises a first passing roller, which is rotatably arranged on the rack and located between the first unwinding assembly and the first winding assembly, and is used for winding the to-be-pre-lithiated piece; wherein the first passing roller is a plurality of, and the plurality of first passing rollers are arranged at intervals along the conveying direction of the to-be-pre-lithiated piece.

[0014] Further, the negative plate pre-lithiation device further comprises a second passing roller, which is rotatably arranged on the rack and located between the second unwinding assembly and the second winding assembly, and is used for winding the shielding piece; wherein the second passing roller is a plurality of, and the plurality of second passing rollers are arranged at intervals along the conveying direction of the shielding piece.

[0015] Further, the negative plate pre-lithiation device further comprises a guide roller, which is arranged on the rack and located between the first unwinding assembly and the cooling roller, so as to guide the to-be-pre-lithiated piece in the conveying process.

[0016] The technical scheme of the utility model discloses, the negative pole piece prelithium equipment is set in the vacuum environment, the first unwinding assembly and the first winding assembly of negative pole piece prelithium equipment are set on the rack, and the first unwinding assembly and the first winding assembly are used to transport the prelithium piece. The second unwinding assembly and the second winding assembly set on the rack are used to transport the shielding piece. The cooling roller is set on the rack, 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 prelithium piece and the shielding piece in the conveying process. The evaporation assembly has an evaporation recess, which 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. The prelithium piece and the shielding piece are sequentially arranged on the cooling roller, the shielding piece is located on the side of the prelithium piece away from the cooling roller, and the shielding piece 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 prelithium piece. In this way, the staff sequentially arranges the negative pole piece on the first unwinding assembly on the cooling roller and the first winding assembly, and then sequentially arranges the mask on the second unwinding assembly on the cooling roller and the first winding assembly. Then, the lithium is heated by the evaporation assembly until it is evaporated. After the lithium is evaporated, it rises and passes through the hollow part of the mask and is deposited on the negative pole piece, forming a layer of lithium film. Then, the mask is wound by the second winding assembly, and the prelithiated negative pole piece is wound by the first winding assembly, thereby completing a prelithiation cycle of the negative pole piece. The above arrangement ensures the uniformity of prelithiation, reduces manual intervention, reduces the operation difficulty and risk of the staff, improves the production efficiency, and solves the problem of low production efficiency of negative pole piece prelithiation in the prior art. At the same time, the arrangement of the mask allows the lithium vapor to be deposited on the negative pole piece only through the hollow part, ensuring the accuracy of prelithiation. At the same time, the arrangement of the cooling roller reduces the heat of the negative pole piece and the mask in the high-temperature evaporation environment, avoids deformation and damage of the negative pole piece and the mask due to heat, prolongs the service life of the negative pole piece and the mask, and ensures the smoothness of the negative pole piece and the mask, further improving the production efficiency of prelithiation. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. In the drawings:

[0018] Figure 1 An overall structure schematic diagram of an embodiment of the negative pole piece prelithium equipment according to the utility model is shown.

[0019] Figure 2 A partial structure perspective view of an embodiment of the negative pole piece prelithium equipment according to the utility model is shown.

[0020] Wherein, the above-mentioned drawings include the following reference signs:

[0021] 1, to be prelithiation piece; 2, shielding piece; 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 passing roller;

[0029] 80, second passing roller;

[0030] 90, guide roller. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0033] In the present application, unless otherwise stated, the orientation words such as "up, down" are generally directed to the direction shown in the drawings, or to the vertical, perpendicular or gravity direction; similarly, for the convenience of understanding and description, "left, right" is generally directed to the left and right shown in the drawings; "inner, outer" refers to the inner and outer relative to the contour of each component, but the above-mentioned orientation words are not used to limit the present application.

[0034] In order to solve the problem of low production efficiency of negative pole piece prelithiation in the prior art, the present application provides a negative pole piece prelithiation equipment.

[0035] As Figure 1 and Figure 2As shown, the negative plate pre-lithium equipment is arranged in a vacuum environment, and the negative plate pre-lithium equipment comprises a rack, a first unwinding assembly 11, a first winding assembly 12, a second unwinding assembly 21, a second winding assembly 22, a cooling and evaporation assembly 40. The first unwinding assembly 11 and the first winding assembly 12 arranged on the rack are used for conveying the pre-lithium piece 1. The second unwinding assembly 21 and the second winding assembly 22 arranged on the rack are used for conveying the shielding piece 2. The cooling roller 30 is arranged on the rack, the cooling roller 30 is located between the first unwinding assembly 11 and the first winding assembly 12, and is located between the second unwinding assembly 21 and the second winding assembly 22, so as to cool the pre-lithium piece 1 and the shielding piece 2 in the conveying process. The evaporation assembly 40 has an evaporation recess for accommodating the metal to be evaporated, and the evaporation assembly 40 is arranged below the cooling roller 30 to evaporate the metal to be evaporated. Wherein, the pre-lithium piece 1 and the shielding piece 2 are sequentially arranged on the cooling roller 30, the shielding piece 2 is located on the side of the pre-lithium piece 1 away from the cooling roller 30, and the shielding piece 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 pre-lithium piece 1.

[0036] The technical scheme is applied to the negative plate pre-lithium equipment, which is arranged in a vacuum environment, the first unwinding assembly 11 and the first winding assembly 12 of the negative plate pre-lithium equipment are arranged on the rack, and the first unwinding assembly 11 and the first winding assembly 12 are used for conveying the pre-lithium piece 1. The second unwinding assembly 21 and the second winding assembly 22 arranged on the rack are used for conveying the shielding piece 2. The cooling roller 30 is arranged on the rack, 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, and is used for cooling the pre-lithium piece 1 and the shielding piece 2 in the conveying process. The evaporation assembly 40 has an evaporation recess for containing the metal to be evaporated, and the evaporation assembly 40 is arranged below the cooling roller 30 to evaporate the metal to be evaporated. The pre-lithium piece 1 and the shielding piece 2 are sequentially arranged on the cooling roller 30, the shielding piece 2 is located on the side of the pre-lithium piece 1 away from the cooling roller 30, and the shielding piece 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 pre-lithium piece 1. In this way, the staff sequentially arranges the negative plate on the first unwinding assembly 11 on the cooling roller 30 and the first winding assembly 12, and then arranges the mask on the second unwinding assembly 21 on the cooling roller 30 and the first winding assembly 12. Then, the lithium is heated by the evaporation assembly 40 until it is evaporated, and the lithium evaporated rises and passes through the hollow part 201 of the mask and is deposited on the negative plate to form a layer of lithium film. Then, the mask is wound by the second winding assembly 22, and the negative plate that has been pre-lithiated is wound by the first winding assembly 12, thereby completing a pre-lithiation cycle of the negative plate. The above arrangement ensures the uniformity of pre-lithiation, reduces manual intervention, reduces the operation difficulty and risk of the staff, improves the production efficiency, ensures the continuous production of the pre-lithiation of the negative plate, and solves the problem of low production efficiency of the pre-lithiation of the negative plate in the prior art. At the same time, the arrangement mode of the mask makes the lithium vapor only deposited on the negative plate through the hollow part 201, ensuring the accuracy of pre-lithiation; at the same time, the arrangement mode of the cooling roller 30 reduces the heat of the negative plate and the mask in the high-temperature evaporation environment, avoids the deformation and damage of the negative plate and the mask due to heat, prolongs the service life of the negative plate and the mask, and ensures the smoothness of the negative plate and the mask, further improving the production efficiency of pre-lithiation.

[0037] In the embodiment, the pre-lithium piece 1 is a negative plate.

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

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

[0040] Optionally, a resistance wire is wound in the evaporation assembly 40 to heat the lithium by the resistance wire.

[0041] Optionally, the evaporation assembly 40 is provided with an induction coil, and heating of the lithium is achieved by generating an induced current.

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

[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 the lithium from reacting.

[0045] In this embodiment, the mask and the negative plate are both attached to the cooling roller in a setting mode, compared with the setting mode of the traditional shielding piece, the lithium vapor can be uniformly deposited on the negative plate, the shape of the deposited lithium film can match the hollow part of the mask, avoiding the subsequent cutting process caused by the inconsistency between the shape of the lithium film and the set shape, reducing the labor intensity of the workers and improving the work efficiency.

[0046] In this embodiment, the shape of the hollow part 201 is adjustably set; and / or, the temperature T of the cooling roller 30 satisfies: -30°≤T≤30°. In this way, the workers change the shape of the hollow part 201 to control the deposition area of the lithium vapor to adapt to the requirements of different specifications and sizes of batteries, improving the versatility and flexibility of the negative plate pre-lithium equipment. At the same time, the temperature setting of the cooling roller 30, on the one hand, cools the negative plate and the mask above the evaporation assembly 40 during the pre-lithiation of the negative plate, avoiding the thermal deformation and burning of the negative plate and the mask due to the excessive temperature, prolonging the service life of the negative plate and the mask; on the other hand, the cooling temperature of the cooling roller 30 is more appropriate, avoiding the damage of the negative plate caused by the sudden change of temperature, further ensuring the quality of the negative plate. At the same time, the above setting of the temperature of the cooling roller 30 makes the temperature of the cooling roller 30 more flexible and diverse, improving the cooling flexibility and versatility of the cooling roller 30.

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

[0048] Optionally, the hollow part 201 is set in a circular, elliptical or polygonal shape.

[0049] Specifically, 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 plate prelithium device further comprises at least two pressure detection devices and a control device. 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 to-be-prelithium piece 1 and the mask. The control device is connected with the pressure detection devices, 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 rotating speeds of the first unwinding roller 111 and the second unwinding roller 211 according to the detection data of the pressure detection devices; and / or, the control device controls the rotating speeds of the first winding roller 121 and the second winding roller 221 according to the detection data of the pressure detection devices. In this way, the control device controls and regulates the rotating speeds of the first unwinding roller 111, the first winding roller 121, the second unwinding roller 211 and the second winding roller 221 by monitoring the detection data of the pressure detection devices in real time, thereby ensuring the stability of the tension during the conveying of the negative plate and the mask, and improving the conveying reliability of the negative plate and the mask. At the same time, the above-mentioned arrangement also improves the automation degree of the negative plate prelithium device, reduces the work difficulty and intensity of the staff, and improves the work efficiency. At the same time, the above-mentioned arrangement can also control the thickness of the lithium film by controlling the rotating speeds of the first unwinding roller 111, the first winding roller 121, the second unwinding roller 211 and the second winding roller 221, so as to adapt to the specification requirements of different batteries, and further improve the universality of the negative plate prelithium device.

[0050] Specifically, the rotating speeds of the first unwinding roller 111 and the second unwinding roller 211 are consistent, and the rotating speeds of the first winding roller 121 and the second winding roller 221 are consistent. In this way, the consistent rotating speeds of the first unwinding roller 111 and the second unwinding roller 211 and the consistent rotating speeds of the first winding roller 121 and the second winding roller 221 enable the negative plate and the mask to always maintain a state of adhesion during the conveying process, thereby ensuring the reliability of the prelithiation of the negative plate.

[0051] In the embodiment, the first unwinding assembly 11 further comprises a motor, the motor is drivingly connected with the first unwinding roller 111 to drive the first unwinding roller 111 to rotate, and the control module is connected with the motor to control the rotating speed of the motor and further control the rotation of the first unwinding roller 111.

[0052] In the embodiment, the first winding assembly 12 further comprises a motor, the motor is drivingly connected with the first winding roller 121 to drive the first winding roller 121 to rotate, and the control module is connected with the motor to control the rotating speed of the motor and further control the rotation of the first winding roller 121.

[0053] In the embodiment, the second unwinding assembly 21 further comprises a motor, the motor is in driving connection with the second unwinding roller 211 to drive the second unwinding roller 211 to rotate, and the control module is connected with the motor to control the rotating speed of the motor, thereby controlling the rotation of the second unwinding roller 211.

[0054] In the embodiment, the second winding assembly 22 further comprises a motor, the motor is in driving connection with the second winding roller 221 to drive the second winding roller 221 to rotate, and the control module is connected with the motor to control the rotating speed of the motor, thereby controlling the rotation of the second winding roller 221.

[0055] Specifically, the tension F1 in the negative electrode sheet conveying process satisfies 50N≤F1≤300N, so that the negative electrode sheet is tightly attached to the outer surface of the cooling roller 30.

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

[0057] In the embodiment, the cooling roller 30 has a biasing and adsorbing function, which can ensure the reliable attachment of the negative electrode sheet to the cooling roller 30.

[0058] As shown in Figure 1 and Figure 2 , the negative electrode sheet pre-lithium equipment further comprises a heating roller 50, which is arranged on the rack and located between the cooling roller 30 and the first winding assembly 12 to heat the pre-lithium piece 1 in the conveying process. In this way, after the negative electrode sheet plated with lithium is rapidly cooled by the cooling roller 30, the surface of the negative electrode sheet plated with lithium is prone to have metal internal stress, which causes the phenomenon of dark lines and cracks on the surface of the lithium film. The above arrangement 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 the more stable combination between the lithium film and the negative electrode sheet, and improve the quality of the pre-lithiated negative electrode sheet.

[0059] As shown in Figure 1 and Figure 2 , the negative electrode sheet pre-lithium equipment further comprises a cooling assembly 60, which is arranged on the rack and located between the heating roller 50 and the first winding assembly 12 to cool the pre-lithium piece 1 in 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 the normal temperature state, thereby facilitating the winding of the pre-lithiated negative electrode sheet by the first winding assembly 12, and avoiding the phenomenon of dark lines and cracks on the surface of the lithium film caused by the internal stress of the lithium film due to the excessively high temperature in the winding process, and further ensuring the quality of the pre-lithiated negative electrode sheet.

[0060] As shown in Figure 1 andFigure 2 As shown, the cooling assembly 60 comprises at least two oppositely arranged cooling structures 61, and a cooling space 62 is formed around the at least two cooling structures 61. During the process that the to-be-pre-lithium member 1 passes through the cooling space 62, the cooling structures 61 cool the to-be-pre-lithium member 1. In this way, the cooling assembly 60 cools the negative plate through the cooling structures 61. Meanwhile, the above arrangement of the cooling structures 61 enables both sides of the negative plate to be cooled, expands the contact area between the negative plate and the cooling structures 61, and improves the cooling efficiency of the cooling assembly 60.

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

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

[0063] Specifically, the cooling assembly 60 further comprises a driving structure, and at least one cooling structure 61 is movably arranged, and the driving structure is drivingly connected with the cooling structure 61 to adjust the size of the cooling space 62 during the process that the cooling structure 61 moves towards or away from another cooling structure 61. In this way, the above arrangement enables the cooling assembly 60 to adapt to negative plates of different specifications and sizes, improves the cooling versatility of the cooling assembly 60, and also improves the versatility of the negative plate pre-lithium equipment.

[0064] As shown in FIGS. 1, 2 and 3, Figure 1 and Figure 2 The negative plate pre-lithium equipment further comprises a first passing roller 70, which is rotatably arranged on the rack and located between the first unwinding assembly 11 and the first winding assembly 12, and is used for winding the to-be-pre-lithium member 1. The first passing roller 70 is a plurality of, and the plurality of first passing rollers 70 are arranged at intervals along the conveying direction of the to-be-pre-lithium member 1. In this way, the arrangement of the plurality of first passing rollers 70 ensures the stability and smoothness of the negative plate conveying, and avoids damage to the negative plate due to unstable conveying. Meanwhile, the above arrangement also balances the stress of the negative plate during conveying, and further ensures the quality of the negative plate.

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

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

[0067] As shown in Figure 1 and Figure 2 The negative plate pre-lithium equipment also comprises a second passing roller 80, which is rotatably arranged on the rack and located between the second unwinding assembly 21 and the second winding assembly 22, and is used for winding the shielding piece 2. The second passing roller 80 is a plurality of, and the plurality of second passing rollers 80 are arranged at intervals along the conveying direction of the shielding piece 2. In this way, the arrangement mode of the plurality of second passing rollers 80 ensures the stability and smoothness of the mask conveying, and avoids the damage of the mask due to unstable conveying. At the same time, the above arrangement also balances the stress of the mask in the conveying process, and ensures the quality of the mask.

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

[0069] It should be noted that the number of the second passing rollers 80 arranged between the second unwinding assembly 21 and the second winding assembly 22 is not limited to this, and can be adjusted according to the working condition and use requirement. Optionally, the number of the second passing rollers 80 arranged between the second unwinding assembly 21 and the second winding assembly 22 is three, or six, or eight, or nine, or a plurality.

[0070] As shown in Figure 1 and Figure 2 The negative plate pre-lithium equipment also comprises a guide roller 90, which is arranged on the rack and located between the first unwinding assembly 11 and the cooling roller 30, and is used for guiding the pre-lithium piece 1 in the conveying process. In this way, the guide roller 90 can guide the negative plate in the conveying process of the negative plate, ensure the conveying accuracy of the negative plate, improve the conveying efficiency of the negative plate, and also avoid the offset of the negative plate in the conveying process, which leads to the wrinkle and damage of the negative plate, and further ensure the quality of the negative plate.

[0071] Specifically, the staff first unwinds the negative plate from the first unwinding assembly 11 and winds it on the first passing roller 70, the guide roller 90, the cooling roller 30, the first passing roller 70 and the heating roller 50 in sequence, then passes through the cooling space 62 and winds it on the first passing roller 70, and then winds it on the first winding assembly 12. Then, the staff unwinds the mask from the second unwinding assembly 21 and winds it on the second passing roller 80, the cooling roller 30 and the second passing roller 80 in sequence, and then winds it on the second winding assembly 22. Then, the evaporation assembly 40 is started to evaporate lithium, and the lithium vapor is deposited on the negative plate.

[0072] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0073] The negative electrode sheet pre-lithium equipment is arranged in a vacuum environment, the first unwinding assembly and the first winding assembly of the negative electrode sheet pre-lithium equipment are arranged on a rack, and the first unwinding assembly and the first winding assembly are used for conveying a pre-lithium piece. The second unwinding assembly and the second winding assembly arranged on the rack are used for conveying a shielding piece. The cooling roller is arranged on the rack, 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 piece and the shielding piece in the conveying process. The evaporation assembly has an evaporation recess for accommodating a metal to be evaporated, and the evaporation assembly is arranged below the cooling roller to evaporate the metal to be evaporated. The pre-lithium piece and the shielding piece are sequentially arranged on the cooling roller, the shielding piece is located on the side of the pre-lithium piece away from the cooling roller, and the shielding piece 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 piece. In this way, the workers sequentially arrange the negative electrode sheet on the first unwinding assembly on the cooling roller and the first winding assembly, and then sequentially arrange the mask on the second unwinding assembly on the cooling roller and the first winding assembly. Then, the lithium is heated by the evaporation assembly until it is evaporated, and the lithium evaporated rises and passes through the hollow part of the mask and is deposited on the negative electrode sheet to form a layer of lithium film. Then, the mask is wound by the second winding assembly, and the negative electrode sheet that has been pre-lithiated is wound 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, reduces manual intervention, reduces the operation difficulty and danger of workers, improves the production efficiency, and solves the problem of low production efficiency of negative electrode sheet pre-lithiation in the prior art. At the same time, the arrangement of the mask allows the lithium vapor to be deposited on the negative electrode sheet only through the hollow part, ensuring the accuracy of pre-lithiation. At the same time, the arrangement of the cooling roller reduces the heat of the negative electrode sheet and the mask in the high-temperature evaporation environment, avoids deformation and damage of the negative electrode sheet and the mask due to heat, prolongs the service life of the negative electrode sheet and the mask, ensures the smoothness of the negative electrode sheet and the mask, and further improves the production efficiency of pre-lithiation.

[0074] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, the presence of a feature, step, work, device, component and / or combination thereof is indicated.

[0075] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and in the above-described drawings are used only for distinguishing between similar objects and do not necessarily have to describe a specific sequential or chronological order. It is to be understood that the data so distinguished can be interchanged, under appropriate circumstances, such that the embodiments of the present application described herein can be practiced in other than the illustrated or described order.

[0076] The preferred embodiments of the present application have been described above with the specific details. Obviously, the present application can be carried out without the specific details. It is to be understood that the above-described embodiments are only used to illustrate the present application, and the present application can be modified and changed in various ways by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A negative electrode sheet pre-lithiation device provided in a vacuum environment, characterized by, The negative plate pre-lithium equipment comprises: a rack; a first unwinding assembly (11) and a first winding assembly (12) arranged on the rack, the first unwinding assembly (11) and the first winding assembly (12) being used for conveying a pre-lithium piece (1); a second unwinding assembly (21) and a second winding assembly (22) arranged on the rack, the second unwinding assembly (21) and the second winding assembly (22) being used for conveying a shielding piece (2); a cooling roller (30) arranged on the rack, 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) for cooling the pre-lithium piece (1) and the shielding piece (2) in the conveying process; an evaporation assembly (40) having an evaporation recess for accommodating a metal to be evaporated, the evaporation assembly (40) being arranged below the cooling roller (30) for evaporating the metal to be evaporated; wherein the pre-lithium piece (1) and the shielding piece (2) are sequentially arranged on the cooling roller (30), the shielding piece (2) is located on a side of the pre-lithium piece (1) away from the cooling roller (30), and the shielding piece (2) has a hollow portion (201) and a shielding portion (202) so that the metal vapor after the metal to be evaporated is evaporated passes through the hollow portion (201) and is deposited on the pre-lithium piece (1).

2. The negative electrode sheet pre-lithiation apparatus according to claim 1, characterized by, 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 plate pre-lithium equipment further comprises: at least two pressure detection devices, the at least two pressure detection devices being arranged on the first unwinding roller (111) and the second unwinding roller (211) respectively to detect the surface tension of the pre-lithium piece (1) and the shielding piece (2); a control device connected with the pressure detection devices, the first unwinding roller (111), the first winding roller (121), the second unwinding roller (211) and the second winding roller (221), the control device controlling the rotating speeds of the first unwinding roller (111) and the second unwinding roller (211) according to the detection data of the pressure detection devices; and / or the control device controlling the rotating speeds of the first winding roller (121) and the second winding roller (221) according to the detection data of the pressure detection devices.

3. The negative electrode sheet pre-lithiation apparatus according to claim 2, characterized by, The rotating speeds of the first unwinding roller (111) and the second unwinding roller (211) are consistent, and the rotating speeds of the first winding roller (121) and the second winding roller (221) are consistent.

4. The negative electrode sheet pre-lithiation apparatus according to claim 1, characterized by, The negative plate pre-lithium equipment further comprises a heating roller (50) disposed on the rack and located between the cooling roller (30) and the first winding assembly (12) to heat the to-be-pre-lithium member (1) in the conveying process.

5. The negative electrode sheet pre-lithiation apparatus according to claim 4, characterized by, The negative plate pre-lithium equipment further comprises a cooling assembly (60) disposed on the rack and located between the heating roller (50) and the first winding assembly (12) to cool the to-be-pre-lithium member (1) in the conveying process.

6. The negative electrode sheet pre-lithiation apparatus according to claim 5, characterized by, The cooling assembly (60) comprises at least two oppositely disposed cooling structures (61), and a cooling space (62) is formed around the at least two cooling structures (61). The cooling structure (61) cools the to-be-pre-lithium member (1) in the process of passing through the cooling space (62).

7. The negative electrode sheet pre-lithiation apparatus according to claim 6, characterized by, The cooling assembly (60) further comprises a driving structure, and at least one cooling structure (61) is movably disposed and drivingly connected with the driving structure to adjust the size of the cooling space (62) in the process of driving the cooling structure (61) to move towards or away from another cooling structure (61).

8. The negative electrode sheet pre-lithiation apparatus according to claim 1, characterized by, The negative plate pre-lithium equipment further comprises a first passing roller (70) rotatably disposed on the rack and located between the first unwinding assembly (11) and the first winding assembly (12), and the first passing roller (70) is used for winding the to-be-pre-lithium member (1); wherein the first passing roller (70) is a plurality of first passing rollers (70) which are spaced apart along the conveying direction of the to-be-pre-lithium member (1).

9. The negative electrode sheet pre-lithiation apparatus according to claim 8, characterized by, The negative plate pre-lithium equipment further comprises a second passing roller (80) rotatably disposed on the rack and located between the second unwinding assembly (21) and the second winding assembly (22), and the second passing roller (80) is used for winding the shielding member (2); wherein the second passing roller (80) is a plurality of second passing rollers (80) which are spaced apart along the conveying direction of the shielding member (2).

10. The negative electrode sheet pre-lithiation apparatus according to claim 1, wherein The negative plate pre-lithium equipment further comprises a guide roller (90) disposed on the rack and located between the first unwinding assembly (11) and the cooling roller (30) to guide the to-be-pre-lithium member (1) in the conveying process.

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