Graphene battery material preparation device and method

Abstract

The invention relates to the field of battery preparation, in particular to a graphene battery material preparation device and method.The graphene battery material preparation device comprises a release roller, a winding roller and a supporting table located between the release roller and the winding roller, and a coating unit is arranged above the supporting table; the coating unit comprises a coating shell, a coating roller and a plurality of material injection pipes, a coating groove is formed in the bottom of the coating shell, a plurality of partition plates are fixedly arranged in the coating groove, the partition plates are vertically arranged and are parallel to one another, the partition plates are placed in the moving direction of the current collector, and a coating gap is formed between every two adjacent partition plates; the multiple material injection pipes and the multiple coating gaps are connected in a one-to-one correspondence mode, and the two adjacent material injection pipes inject the first slurry and the second slurry into the two adjacent coating gaps correspondingly; the coating roller penetrates through the multiple partition plates, the coating roller is rotationally connected with the partition plates, and the coating roller is opposite to the bottom of the material injection pipe. By means of the device, the production efficiency of the graphene battery material is improved, and the problem that the production efficiency of the graphene battery material is low is solved.

Description

Technical Field

[0001] This invention relates to the field of battery fabrication, and more specifically to an apparatus and method for preparing graphene battery materials. Background Technology

[0002] Lithium-ion battery anodes are commonly used materials in batteries. Chinese Patent Publication No. CN115513408A discloses a lithium-ion battery anode and its preparation method. This prior art lithium-ion battery anode includes a current collector and a negative electrode slurry layer, with the slurry layer covering the current collector. The slurry layer includes multiple first and second slurry portions, which are alternately arranged. The first slurry portion contains graphene, while the second slurry portion contains zero graphene. Because the existing technology only contains graphene in the first slurry section and not in the second slurry section, the entire negative electrode slurry layer does not contain graphene. This avoids the entire negative electrode slurry layer being covered with graphene, and the second slurry section does not hinder the diffusion of lithium ions, reducing the impact of sheet-like graphene on the diffusion of lithium ions. Compared with graphene being distributed throughout the entire negative electrode, this improves the performance of the lithium battery, helps to increase the amount of lithium ions inserted into the negative electrode, and optimizes the fast charging and discharging performance of the battery.

[0003] The existing technology for preparing lithium-ion battery anodes involves using a mold. A first slurry and a second slurry are extruded into the forming cavity of the mold, creating alternating layers of the first and second slurry portions. These anode slurry layers are then applied to the current collector and dried. This existing technology for preparing lithium-ion battery anodes has the following drawbacks: it is only suitable for experimental or small-scale production, hindering industrial application; and it has low production efficiency, making large-scale, efficient production of lithium-ion battery anodes difficult. The main reasons are: 1. The mold can only form one anode slurry layer at a time. Large-scale production requires multiple molds to form multiple anode slurry layers separately, which is cumbersome and inefficient. 2. The anode slurry layers also need to be separately bonded to the current collector, which is time-consuming and further reduces production efficiency.

[0004] In addition, the lithium battery anode produced by this method has the following disadvantages: the first slurry section and the second slurry section are bonded together by the viscous extrusion of the slurry, the connection stability of the contact area between the first slurry section and the second slurry section is weak, and the anode slurry layer is prone to cracking and poor contact at the contact area between the first slurry section and the second slurry section. Summary of the Invention

[0005] The present invention aims to provide an apparatus and method for preparing graphene battery materials, so as to improve the production efficiency of graphene battery materials and solve the problem of low production efficiency of graphene battery materials.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a graphene battery material preparation device, including a release roller, a take-up roller, and a support platform located between the release roller and the take-up roller, with a coating unit provided above the support platform; The coating unit includes a coating shell, a coating roller, and multiple injection tubes. The bottom of the coating shell is provided with a coating groove, and multiple partition plates are fixedly installed in the coating groove. The multiple partition plates are arranged vertically and are parallel to each other. The partition plates are placed along the moving direction of the current collector, and there is a coating gap between adjacent partition plates. The multiple injection tubes and the multiple coating gaps are connected one-to-one. Adjacent two injection tubes inject a first slurry and a second slurry into adjacent two coating gaps, respectively. The coating roller passes through the multiple partition plates, and the coating roller and the partition plates are rotatably connected. The bottom of the coating roller and the injection tubes are opposite each other, and the bottom side of the coating roller is higher than the bottom surface of the partition plate. There is a moving gap between the bottom surface of the partition plate and the support platform for moving the collector.

[0007] The principle and advantages of this scheme are as follows: The current collector is wound onto the release roller. During the preparation of graphene battery materials (lithium battery anode), the release roller releases the current collector, which moves towards the winding roller via the support platform. Because there is a movement gap between the bottom surface of the separator plate and the support platform for the movement of the current collector, it moves laterally through the gap without being affected by the coating unit. Simultaneously, multiple injection tubes inject the first and second slurries into corresponding parts of the coating roller. The slurries adhere to the coating roller. As the coating roller rotates and the current collector moves, the coating roller transfers the slurry to the upper surface of the current collector, coating it with the slurry to form a slurry layer. Under the pressure of the coating roller, the slurry adheres more firmly to the current collector. Since adjacent injection tubes inject the first and second slurries into adjacent coating gaps respectively, the coating rollers of adjacent coating gaps are respectively coated with the first and second slurries, thus achieving alternating layers of the first and second slurry coated on the upper surface of the current collector. Because the bottom side of the coating roller is higher than the bottom surface of the separator plate, a certain thickness of slurry can be coated on the current collector. After the slurry is coated, the current collector coated with slurry comes out of the coating unit and is conveyed by the take-up roller, and finally wound up by the take-up roller.

[0008] The above technical solution has the following beneficial effects: 1. During the process of conveying the current collector from the release roller to the take-up roller, the first slurry and the second slurry are automatically coated on the upper surface of the current collector. The first slurry layer and the second slurry layer are alternately set on the current collector. The current collector does not stop conveying the slurry during the coating process, thereby realizing the continuous preparation of graphene battery materials. Compared with the existing technology, it is beneficial to improve the preparation efficiency and facilitate the large-scale production of lithium battery anodes.

[0009] 2. The function of the separator plate is to separate two adjacent coating gaps, so that the slurry on the coating rollers in the two adjacent coating gaps will not affect each other, and different slurries in adjacent coating gaps will not flow to each other, thus ensuring that the first slurry layer and the second slurry layer coated on the current collector are alternately set in sequence.

[0010] 3. The slurry is coated onto the current collector using a coating roller. The coating roller exerts a certain squeezing effect on the slurry, which makes the slurry adhere more firmly and tightly to the current collector. The slurry is not easy to fall off the current collector, thus improving the structural stability of the graphene battery material.

[0011] Preferably, as an improvement, the bottom surface of the partition plate is provided with an injection hole, and the interior of the partition plate is provided with an adhesive channel, which is connected to the injection hole; the outer side of the coating shell is provided with an adhesive tank, which is connected to the adhesive channel; the current collector first passes through the coating roller and then through the injection hole.

[0012] Therefore, the current collector first passes through a coating roller, which coats the current collector with slurry. Due to the barrier effect of the separator, the coated first and second slurries are separated. Then, the current collector coated with the first and second slurries passes through an injection hole. Conductive adhesive is injected into the gap between the first and second slurries through the injection hole. The conductive adhesive fills the gap between the first and second slurries, causing them to adhere together. Finally, the first and second slurry layers on the prepared graphene battery material are connected as one by the conductive adhesive. The entire slurry layer structure is stable and firm, and the first and second slurry layers will not separate, thus improving the structural stability of the graphene battery material. If conductive adhesive is not injected into the gap between the first and second slurries, gaps will exist between the first and second slurry layers due to the separation effect of the separator, and the first and second slurry layers will not be connected, thus affecting the structural stability of the entire slurry layer.

[0013] In addition, by injecting conductive adhesive between the first slurry layer and the second slurry layer, a conductive adhesive strip is formed between the first slurry layer and the second slurry layer. There are multiple conductive adhesive strips, which are arranged parallel to each other along the length of the current collector. The conductive adhesive strip can effectively enhance the conductivity of the graphene battery material. A good conductive network is formed between the slurry layer and the conductive adhesive strip. The conductive adhesive strip can ensure that electrons can flow rapidly during the charging and discharging process of the battery, thereby improving the efficiency and performance of the battery.

[0014] In addition to their conductive properties, the conductive adhesive strips, when arranged along the length of the current collector, not only provide structural support but also increase the mechanical strength of the graphene battery material. During the charging and discharging process, the material undergoes expansion and contraction; the conductive adhesive helps resist these physical changes, maintaining electrode stability and thus improving battery life.

[0015] Therefore, this device enables conductive adhesive strips to be applied to graphene battery materials, which plays a certain role in improving the performance of graphene battery materials.

[0016] Preferably, as an improvement, an adhesive application component is provided above the support platform. The adhesive application component is an adhesive brush or an adhesive roller; the adhesive application component is located in front of the coating unit.

[0017] Thus, the current collector moves on the support platform and enters the coating unit, where the adhesive coating component coats the surface of the current collector with conductive adhesive. In this way, the slurry is coated on the surface of the current collector and can adhere to the surface of the current collector through the conductive adhesive, thereby improving the connection stability between the slurry and the current collector.

[0018] Preferably, as an improvement, a drying chamber is also provided on the support platform, located behind the coating unit and covering the support platform. Thus, after the slurry is coated onto the current collector, the current collector enters the drying chamber, where the drying chamber dries the slurry on the current collector.

[0019] Preferably, as an improvement, the distance between the bottom side of the coating roller and the bottom surface of the separator plate is 1-2 mm. This results in a smaller distance between the bottom side of the coating roller and the bottom surface of the separator plate, thus reducing the thickness of the coated slurry.

[0020] Preferably, as an improvement, the bottom of the separator plate away from the release roller is provided with a notch, and the glue injection hole is located on the side wall of the notch.

[0021] Therefore, the notch design ensures that after the current collector moves to this location, the gap between the first slurry and the second slurry is not completely filled by the separator plate. There is a certain space between the first slurry and the second slurry to accommodate the conductive adhesive, thus preventing the separator plate from completely filling the space between the first slurry and the second slurry without leaving any space to accommodate the conductive adhesive.

[0022] Preferably, as an improvement, the notch sidewall is inclined, with the end of the inclined surface away from the release roller being the high end and the other end being the low end.

[0023] As a result, the current collector and the slurry move to the notch in the separator plate. Since the sidewall of the notch is sloping, the space between the first slurry and the second slurry is cleared from bottom to top. The bottom of the space between the first slurry and the second slurry is cleared first, and the top is cleared later. This allows the conductive adhesive to fill the space between the first slurry and the second slurry in a bottom-up order, avoiding the problem that it is not easy to inject the conductive adhesive if the space between the first slurry and the second slurry is filled in a top-down order. Meanwhile, with the above structure, as the current collector moves, the space between the first slurry and the second slurry gradually becomes clearer from bottom to top. There will still be a partition plate between the first slurry and the second slurry to block them (because the sidewall of the notch is inclined, as the current collector moves, the area of ​​the partition plate between the first slurry and the second slurry becomes smaller and smaller, but during this process, there will still be a partition plate between the first slurry and the second slurry to block them). This allows the partition plate to gradually withdraw from between the first slurry and the second slurry, avoiding the problem that the partition plate between the first slurry and the second slurry would suddenly withdraw, causing the space between the first slurry and the second slurry to close and making it difficult to inject conductive adhesive.

[0024] Preferably, as an improvement, the maximum distance from the sidewall of the notch to the bottom surface of the partition plate is 1-2 mm.

[0025] To achieve the above objectives, the present invention adopts the following technical solution: a method for preparing graphene battery materials, wherein the graphene battery material is prepared using the above-mentioned graphene battery material preparation apparatus.

[0026] In addition, the graphene battery material prepared by the above-mentioned graphene battery material preparation apparatus or the above-mentioned graphene battery material preparation method includes a current collector and a first slurry layer and a second slurry layer located on the current collector. The first slurry layer and the second slurry layer are alternately arranged, and a conductive adhesive strip is provided between the first slurry layer and the second slurry layer.

[0027] The graphene battery material prepared by the above-described apparatus and method has excellent performance due to the presence of multiple strip-shaped conductive adhesive strips. It possesses strong mechanical and structural properties as well as electrical conductivity. These advantages have been described above and will not be repeated here. Attached Figure Description

[0028] Figure 1 This is a top view of the graphene battery material of this application.

[0029] Figure 2 This is a schematic diagram of the end of the graphene battery material along its length in this application.

[0030] Figure 3This is a schematic diagram of a graphene battery material preparation device.

[0031] Figure 4 This is a three-dimensional view of the coating unit.

[0032] Figure 5 for Figure 4 Another perspective stereoscopic view.

[0033] Figure 6 This is a schematic diagram of a partition plate with a notch.

[0034] Figure 7 This is a schematic diagram of a partition plate with an inclined notch. Detailed Implementation

[0035] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: current collector 1, separator 100, coating gap 103, first limiting plate 104, coating tank 105, second limiting plate 106, glue injection hole 107, drive motor 108, coating roller 109, inclined surface 110, notch 111, first slurry layer 2, conductive adhesive strip 3, second slurry layer 4, release roller 5, first guide roller 6, glue coating component 7, glue tube 8, coating shell 9, injection tube 10, glue tank 11, feed tube 12, drying box 13, second guide roller 14, take-up roller 15, support platform 16, and gate 20.

[0036] The basic implementation examples are as follows: Figures 1-7 As shown.

[0037] Combination Figures 1-2 As shown, this embodiment discloses a graphene battery material, including a current collector 1 (the current collector 1 is specifically a copper foil) and a first slurry layer 2 and a second slurry layer 4 located on the current collector 1. The first slurry layer 2 and the second slurry layer 4 are alternately arranged, and a conductive adhesive strip 3 (the conductive adhesive strip 3 is formed by hardening conductive adhesive) is provided between adjacent first slurry layer 2 and second slurry layer 4.

[0038] The improvement of the graphene battery material in this embodiment compared to the prior art (CN115513408A) mainly involves the addition of the conductive adhesive strip 3. The composition of the first slurry layer 2 and the second slurry layer 4 remains unchanged; therefore, the prior art published in patent CN115513408A can be directly referenced, and will not be elaborated upon in this embodiment. The widths of the first slurry layer 2 and the second slurry layer 4 in this embodiment can be set according to actual needs, for example, 5-15 mm.

[0039] The reason for setting the conductive adhesive strip 3 between the first slurry layer 2 and the second slurry layer 4 in this embodiment is that the conductive adhesive strip 3 fills the gap between the first slurry layer 2 and the second slurry layer 4, thereby causing the first slurry layer 2 and the second slurry layer 4 to adhere together under the action of the conductive adhesive strip 3. The first slurry layer 2 and the second slurry layer 4 are connected as one unit through the conductive adhesive strip 3. The entire slurry layer (all the first slurry layer 2 and the second slurry layer 4) has a stable and firm structure, and there will be no separation of the first slurry layer 2 and the second slurry layer 4, which improves the structural stability of the graphene battery material.

[0040] In addition, by providing conductive adhesive strips 3 between the first slurry layer 2 and the second slurry layer 4, and having multiple conductive adhesive strips 3 arranged parallel to each other along the length direction of the current collector 1, the conductive adhesive strips 3 can effectively enhance the conductivity of the graphene battery material. A good conductive network is formed between the slurry layer and the conductive adhesive strips 3. The conductive adhesive strips 3 can ensure that electrons can flow rapidly during the charging and discharging process of the battery, thereby improving the efficiency and performance of the battery.

[0041] In addition, the conductive adhesive strips 3 not only conduct electricity, but also provide structural support for the current collector 1 to a certain extent by being arranged multiple conductive adhesive strips 3 along the length of the current collector 1, thereby increasing the mechanical strength of the graphene battery material. During the charging and discharging process of the battery, the material undergoes expansion and contraction, and the conductive adhesive can help resist these physical changes, maintain the stability of the electrodes, and thus improve the battery life.

[0042] In order to achieve the preparation of the above-mentioned graphene battery material and improve the preparation efficiency of the above-mentioned graphene battery material, the graphene battery material in this embodiment is prepared by the following graphene battery material preparation apparatus, which is described in detail below.

[0043] Combination Figures 3-7 As shown, the graphene battery material preparation apparatus includes a frame (not shown), a release roller 5, a take-up roller 15, and a support platform 16 located between the release roller 5 and the take-up roller 15. Both the take-up roller 15 and the release roller 5 are rotatably mounted on the frame, and the frame is equipped with at least one motor for driving the take-up roller 15 to rotate. A coating unit is located above the support platform 16. A current collector 1 is wound on the release roller 5. After releasing the current collector 1, the release roller 5 conveys it to the right through the coating unit, where the coating unit coats the current collector 1 with a slurry. Then, the current collector 1 is wound up by the take-up roller 15.

[0044] Combination Figure 4 and Figure 5As shown, in this embodiment, the coating unit includes a coating shell 9, a coating roller 109, and multiple injection tubes 10. The coating shell 9 is fixed to the frame by bolts and is located above the support platform 16. The bottom of the coating shell 9 is provided with a coating groove 105 facing the support platform 16. Multiple partition plates 100 are welded and fixed in the coating groove 105. The multiple partition plates 100 are arranged vertically and parallel to each other. The partition plates 100 are placed along the moving direction of the current collector 1, and there is a coating gap 103 between adjacent partition plates 100. The width of the coating gap 103 can be set according to the width of the first slurry layer 2 or the second slurry layer 4. In addition, a first limiting plate 104 and a second limiting plate 106 are also welded and fixed on both sides of the coating shell 9. The first limiting plate 104 and its adjacent partition plate 100 form the coating gap 103, and the second limiting plate 106 and its adjacent partition plate 100 form the coating gap 103.

[0045] In this embodiment, the number of injection tubes 10 is the same as the number of coating gaps 103. The injection tubes 10 are connected to the top of the coating shell 9, and multiple injection tubes 10 and multiple coating gaps 103 are connected one-to-one. The bottom of the injection tubes 10 is connected to the coating gap 103. A first material box (not shown in the figure) and a second material box (not shown in the figure) are provided above the coating shell 9. The first material box contains a first slurry, and the second material box contains a second slurry. A portion of the injection tubes 10 are connected to the first material box, and another portion of the injection tubes 10 are connected to the second material box. The injection tubes 10 connected to the first material box and the injection tubes 10 connected to the second material box are alternately arranged. In this way, two adjacent injection tubes 10 inject the first slurry and the second slurry into two adjacent coating gaps 103, respectively. The coating roller 109 passes through the first limiting plate 104, multiple partition plates 100, and the second limiting plate 106. The coating roller 109 and the partition plates 100 are rotatably connected. A drive motor 108 for driving the coating roller 109 to rotate is provided on the outer side of the first limiting plate 104. The bottoms of the coating roller 109 and the injection tube 10 are opposite each other, so that the slurry flowing out from the bottom of the injection tube 10 adheres to the surface of the coating roller 109. In addition, the bottom outlet of the injection tube 10 is designed to be arc-shaped, so as to match the arc-shaped surface of the coating roller 109, and the arc-shaped surface of the coating roller 109 has good adhesion to the outlet. The bottom side of the coating roller 109 is higher than the bottom surface of the partition plate 100, and the distance between the bottom side of the coating roller 109 and the bottom surface of the partition plate 100 is 1-2 mm, so that the thickness of the slurry coated on the current collector 1 can be controlled within 1-2 mm.

[0046] In this embodiment, the coated shell 9 is located above the support platform 16. There is a moving gap between the bottom surface of the partition plate 100 and the upper surface of the support platform 16 for moving the current collector 1. The current collector 1 moves laterally through the moving gap. The distance between the bottom surface of the partition plate 100 and the upper surface of the support platform 16 is not less than the thickness of the current collector 1, and preferably equal to the thickness of the current collector 1.

[0047] Combination Figure 5 As shown, each of the partition plates 100 has an injection hole 107 on its bottom surface. The partition plate 100 has an adhesive channel inside, and the adhesive channel and the injection hole 107 are connected. An adhesive tank 11 is installed on the outside of the coating shell 9, and the adhesive channel and the adhesive tank 11 are connected. The adhesive tank 11 contains conductive adhesive, and a feed pipe 12 is connected to the adhesive tank 11. The conductive adhesive can be injected into the adhesive tank 11 through the feed pipe 12. A gate 20 is provided on the adhesive tank 11. The gate 20 is slidably connected to the bottom of the adhesive tank 11. When the gate 20 is inserted into the adhesive tank 11, the adhesive channel is closed by the gate 20, and the conductive adhesive in the adhesive tank 11 will not enter the adhesive channel. When the gate 20 is pulled out part of the way, the adhesive channel is no longer closed by the gate 20, and the conductive adhesive in the adhesive tank 11 can enter the adhesive channel and flow out from the injection hole 107 at the bottom of the partition plate 100.

[0048] Combination Figure 3 As shown, an adhesive application component 7 is provided above the support platform 16. The adhesive application component 7 is an adhesive brush or an adhesive roller, and an adhesive tube 8 is connected to the adhesive application component 7. A box for holding adhesive is provided above the adhesive application component 7. The adhesive in the box can flow to the adhesive application component 7 through the adhesive tube 8. The adhesive application component 7 applies the adhesive to the upper surface of the current collector 1. The adhesive application component 7 is located in front of the coating unit. Figure 3 (Left side of the coating unit). A drying chamber 13 is also installed on the support platform 16, located behind the coating unit. Figure 3 (Right side of the intermediate coating unit), the drying oven 13 is covered by the support platform 16. The drying oven 13 can be dried by heating wire or air drying.

[0049] A method for preparing graphene battery materials, wherein the graphene battery material is prepared using the aforementioned graphene battery material preparation apparatus.

[0050] The specific preparation process is as follows: Current collector 1 is wound onto release roller 5. When preparing graphene battery material (lithium battery negative electrode), release roller 5 releases current collector 1. Current collector 1 moves towards take-up roller 15 via support platform 16. The frame is equipped with a first guide roller 6 and a second guide roller 14. The first guide roller 6 allows current collector 1 on release roller 5 to move onto support platform 16, and the second guide roller 14 allows current collector 1 to move onto take-up roller 15. During the rightward movement of current collector 1 on support platform 16, adhesive coating component 7 first coats current collector 1 with an adhesive layer, specifically a conductive adhesive. Then, current collector 1 enters the moving gap between the bottom surface of separator plate 100 and support platform 16, moving laterally through the gap. The coating unit does not affect the movement of current collector 1.

[0051] Simultaneously, multiple injection tubes 10 inject the first slurry and the second slurry into the corresponding coating rollers 109 respectively. The slurry adheres to the coating rollers 109. As the coating rollers 109 rotate and the current collector 1 moves, the coating rollers 109 transfer the slurry to the upper surface of the current collector 1. The coating rollers 109 coat the slurry onto the current collector 1 to form a slurry layer. Under the pressure of the coating rollers 109, the slurry is more firmly connected to the current collector 1. The slurry adheres to the upper surface of the current collector 1 under the action of the adhesive.

[0052] Since the two adjacent injection pipes 10 inject the first slurry and the second slurry into the two adjacent coating gaps 103 respectively, the coating rollers 109 of the two adjacent coating gaps 103 are respectively coated with the first slurry and the second slurry, thereby achieving the alternating arrangement of the first slurry layer 2 and the second slurry layer 4 coated on the upper surface of the current collector 1. Since the bottom side of the coating roller 109 is higher than the bottom surface of the partition plate 100, a certain thickness of slurry can be coated on the current collector 1.

[0053] Simultaneously, the current collector 1 continues to move to the right, and the current collector 1 and the slurry move to the glue injection hole 107 on the bottom surface of the separator plate 100. The glue injection hole 107 injects conductive adhesive between the first slurry and the second slurry. Subsequently, the current collector 1 coated with slurry exits from the coating unit and enters the drying chamber 13. The drying chamber 13 dries and hardens the slurry on the current collector 1, the first slurry becomes the first slurry layer 2, the second slurry becomes the second slurry layer 4, and the conductive adhesive between the first slurry layer 2 and the second slurry layer 4 also hardens to form a conductive adhesive strip 3. Finally, the current collector 1 coated with slurry layers is conveyed to the right and wound up by the take-up roller 15.

[0054] The above describes the preparation process of graphene battery materials.

[0055] In addition, combined Figure 6As shown, the position of the injection hole 107 at the bottom of the separator 100 can be further optimized. A notch 111 is provided at the bottom of the separator 100 away from the release roller 5, and the injection hole 107 is located on the side wall of the notch 111. The distance from the side wall of the notch 111 to the bottom surface of the separator 100 is 1-2 mm, and the side wall of the notch 111 is lower than the bottom side of the coating roller 109. Thus, the notch 111 ensures that after the current collector 1 moves to this location, the gap between the first slurry and the second slurry is not completely filled by the separator 100. There is sufficient space between the first slurry and the second slurry to accommodate the conductive adhesive, preventing the separator 100 from completely filling the space between the first slurry and the second slurry without leaving room for the conductive adhesive. Meanwhile, since the sidewall of the notch 111 is lower than the bottom side of the coating roller 109, the separator 100 at the notch 111 will not completely come out from the first slurry and the second slurry. In other words, the upper surface of the slurry is higher than the sidewall of the notch 111. Thus, the part of the separator 100 at the notch 111 is still located between the first slurry and the second slurry, and the sidewall of the notch 111 will not be located above the slurry layer. This avoids the first slurry and the second slurry from sticking together without separation, which would close the gap between the first slurry and the second slurry. This is beneficial for the conductive adhesive to be injected into the gap between the first slurry and the second slurry.

[0056] In addition, combined Figure 7 As shown, it can be further optimized. The sidewall of the notch 111 is a slope 110. The end of the slope 110 away from the release roller 5 (right end) is the high end, and the other end (left end) is the low end. The maximum distance from the right end of the sidewall of the notch 111 to the bottom surface of the separator plate 100 is 1-2 mm. Thus, the current collector 1 and the slurry move to the notch 111 of the separator plate 100. Since the sidewall of the notch 111 is a slope 110, the space between the first slurry and the second slurry is emptied sequentially from bottom to top. The bottom of the space between the first slurry and the second slurry is emptied first, and the top is emptied last. This allows the conductive adhesive to fill the space between the first slurry and the second slurry sequentially from bottom to top, avoiding the problem of the conductive adhesive being difficult to inject when it is directly filled from top to bottom. Meanwhile, with the above structure, as the current collector 1 moves, the space between the first slurry and the second slurry gradually becomes clearer from bottom to top. There will still be a partition plate 100 between the first slurry and the second slurry to block them (since the side wall of the notch 111 is a slope 110, as the current collector 1 moves, the area of ​​the partition plate 100 between the first slurry and the second slurry becomes smaller and smaller, but during this process, there will still be a partition plate 100 between the first slurry and the second slurry to block them). This allows the partition plate 100 to gradually withdraw from between the first slurry and the second slurry, avoiding the problem that the partition plate 100 between the first slurry and the second slurry will suddenly withdraw, causing the space between the first slurry and the second slurry to close and making it difficult to inject conductive adhesive.

[0057] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A graphene battery material preparation apparatus, characterized in that: It includes a release roller, a take-up roller, and a support platform located between the release roller and the take-up roller, with a coating unit provided above the support platform; The coating unit includes a coating shell, a coating roller, and multiple injection tubes. The bottom of the coating shell is provided with a coating groove, and multiple partition plates are fixedly installed in the coating groove. The multiple partition plates are arranged vertically and are parallel to each other. The partition plates are placed along the movement direction of the current collector, and there is a coating gap between adjacent partition plates. The multiple injection tubes and the multiple coating gaps are connected one-to-one. Adjacent two injection tubes inject a first slurry and a second slurry into adjacent two coating gaps, respectively. The coating roller passes through the multiple partition plates, and the coating roller and the partition plates are rotatably connected. The bottom of the coating roller and the injection tubes are opposite each other, and the bottom side of the coating roller is higher than the bottom surface of the partition plate. There is a moving gap between the bottom surface of the partition plate and the support platform for moving the current collector.

2. The graphene battery material preparation apparatus according to claim 1, characterized in that: The bottom surface of the partition plate is provided with an injection hole, and the interior of the partition plate is provided with an adhesive channel, which is connected to the injection hole; the outer side of the coating shell is provided with an adhesive tank, which is connected to the adhesive channel; the current collector first passes through the coating roller and then through the injection hole.

3. The graphene battery material preparation apparatus according to claim 1, characterized in that: An adhesive application component is provided above the support platform. The adhesive application component is either an adhesive brush or an adhesive roller. The adhesive application component is located in front of the coating unit.

4. The graphene battery material preparation apparatus according to claim 1, characterized in that: A drying chamber is also provided on the support platform. The drying chamber is located behind the coating unit and is covered by the support platform.

5. The graphene battery material preparation apparatus according to claim 1, characterized in that: The distance between the bottom side of the coating roller and the bottom surface of the separator plate is 1-2 mm.

6. The graphene battery material preparation apparatus according to claim 2, characterized in that: The bottom of the separator plate away from the release roller has a notch, and the glue injection hole is located on the side wall of the notch.

7. The graphene battery material preparation apparatus according to claim 6, characterized in that: The sidewall of the notch is an inclined surface, with the end of the inclined surface away from the release roller being the high end and the other end being the low end.

8. The graphene battery material preparation apparatus according to claim 6 or 7, characterized in that: The maximum distance from the sidewall of the notch to the bottom surface of the partition plate is 1-2 mm.

9. A method for preparing graphene battery materials, characterized in that: Graphene battery materials are prepared using the graphene battery material preparation apparatus according to any one of claims 1-8.

10. A graphene battery material, characterized in that: Prepared by the graphene battery material preparation apparatus according to any one of claims 1-8; or prepared by the graphene battery material preparation method according to claim 9; The graphene battery material includes a current collector and a first slurry layer and a second slurry layer located on the current collector. The first slurry layer and the second slurry layer are alternately arranged, and a conductive adhesive strip is provided between the first slurry layer and the second slurry layer.

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