Pole piece preparation device

Abstract

The utility model relates to a pole piece preparation device which comprises a first unwinding mechanism used for unwinding and outputting a first material belt, the first material belt is provided with a current collector and a positive electrode coating, the current collector is provided with a plurality of coating areas arranged at intervals and non-coating areas arranged around the coating areas, and the positive electrode coating is located in the coating areas; the cutting mechanism is used for cutting the second material belt, so that the insulating layer of the second material belt forms a plurality of mutually spaced first areas and continuous second areas, the first areas and the coating areas are arranged in a one-to-one correspondence manner, and the second areas and the non-coating areas are arranged in a one-to-one correspondence manner; and the compounding mechanism is used for compounding the second area of the insulating layer to the non-coating area of the first material belt and forming a positive electrode material belt with a plurality of positive electrode plate areas, and each positive electrode plate area comprises at least part of one coating area and at least part of the non-coating area surrounding the coating area.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electrode preparation apparatus. Background Technology

[0002] Solid-state batteries use a solid electrolyte layer to replace the polymer separator and liquid electrolyte in existing lithium batteries. They have intrinsic safety features and have the potential to be used with high energy density positive and negative electrode materials.

[0003] In the fabrication of solid-state batteries, solid electrolyte layers are stacked between the positive and negative electrode plates. For safety and other convenience considerations, the negative electrode coating area is slightly larger than the positive electrode coating area. After stacking, there are gaps at the edges of the stacked cells. When a large pressure is applied to the stacked cells in a direction perpendicular to the plane of the electrodes, uneven stress and stress concentration occur in these gaps, causing the solid-state battery to be unable to meet the pressure requirements. Utility Model Content

[0004] Therefore, it is necessary to provide an electrode preparation device that enables solid-state batteries to meet the pressure requirements of large pressure, addressing the issue that the battery architecture of traditional solid-state batteries cannot meet the pressure requirements of large pressure.

[0005] An electrode preparation apparatus, comprising:

[0006] A first unwinding mechanism is used to unwind and output a first strip, the first strip having a current collector and a positive electrode coating, the current collector having a plurality of spaced-apart coated areas and an uncoated area surrounding the plurality of coated areas, the positive electrode coating being located in the coated areas;

[0007] A cutting mechanism is used to cut the second strip so that the insulating layer of the second strip forms a plurality of mutually spaced first regions and a continuous second region, wherein the first regions correspond one-to-one with the coating regions and the second regions correspond to the uncoated regions.

[0008] A composite mechanism for bonding a second region of the insulating layer to the uncoated region of the first strip to form a positive electrode strip having a plurality of positive electrode regions, each positive electrode region including at least a portion of a coated region and at least a portion of the uncoated region surrounding the coated region.

[0009] In one embodiment, the electrode preparation apparatus includes two cutting mechanisms, each of which is used to cut two of the second strips.

[0010] The composite mechanism is used to composite the second regions of the insulating layers of the two second strips to the front and back sides of the uncoated region of the first strip, respectively, to form the positive electrode strip.

[0011] In one embodiment, the cutting mechanism includes a back roller and a die-cutting roller, with a cutting gap formed between the back roller and the die-cutting roller for the second strip to pass through. The back roller is used to support the second strip, and the die-cutting roller is used to cut the second strip to form the first region and the second region.

[0012] In one embodiment, the composite mechanism includes a first hot press roller and a second hot press roller, with a hot press gap formed between the first hot press roller and the second hot press roller for the passage of the first strip and the second strip, and the first hot press roller and the second hot press roller cooperate to composite the second region with the uncoated region of the first strip.

[0013] In one embodiment, the electrode preparation apparatus further includes a positioning and correction mechanism located upstream of the composite mechanism, which is used to correct the deviation of the first strip and / or the second strip before the uncoated area of ​​the first strip and the second area of ​​the insulating layer are composited.

[0014] In one embodiment, the electrode preparation apparatus further includes a second unwinding mechanism located upstream of the cutting mechanism for unwinding and outputting the second strip.

[0015] In one embodiment, the electrode preparation apparatus further includes a first winding mechanism located downstream of the composite mechanism for winding the positive electrode strip.

[0016] In one embodiment, the second strip further includes a base film layer and a barrier layer, the insulating layer is sandwiched between the base film layer and the barrier layer, the cutting mechanism is used to cut the barrier layer and the insulating layer, and the barrier layer forms a third region and a fourth region corresponding to the first region and the second region, respectively;

[0017] The electrode preparation apparatus further includes a peeling mechanism, which is located between the cutting mechanism and the composite mechanism. The peeling mechanism is used to peel off the fourth region of the barrier layer. After the fourth region is peeled off, the second region is separated from the base film layer when it passes through the composite mechanism and is transferred to the first material strip to be composited with the first material strip.

[0018] In one embodiment, the electrode preparation apparatus further includes a waste collection mechanism disposed between the cutting mechanism and the composite mechanism for collecting the fourth region.

[0019] In one embodiment, the electrode preparation apparatus further includes a second winding mechanism for winding the second strip that is composited with the first strip in the second region.

[0020] In the aforementioned electrode preparation apparatus, each positive electrode region on the composite positive electrode strip includes at least a portion of a coated region and at least a portion of an uncoated region surrounding the coated region. When the positive electrode strip is cut, each positive electrode region corresponds to the formation of a positive electrode sheet. The positive electrode sheet formed in this way has an insulating layer around its positive electrode coating. Compared to the prior art where only a positive electrode coating exists, when stacking to form a solid-state battery, the insulating layer can fill the empty area at the edge of the stacked cell. Thus, when a large pressure is applied to the stacked cell in a direction perpendicular to the plane where the electrode is located, since at least a portion of the empty area is filled with the insulating layer, the problem of uneven stress and stress concentration in the empty area is reduced, enabling the solid-state battery to meet the pressure requirements of higher pressure applications. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an electrode preparation apparatus provided in one embodiment of this application;

[0022] Figure 2 A diagram illustrating the composite process of a second region of the insulating layer of a second type of material strip being combined with an uncoated region of a first material strip to form a positive electrode material strip;

[0023] Figure 3 A diagram illustrating the composite process of a second region of the insulating layer of a second type of material strip being combined with an uncoated region of the first material strip to form a positive electrode material strip;

[0024] Figure 4 This is a diagram illustrating the process of a second strip being cut by a cutting mechanism and a fourth region being stripped by a stripping mechanism.

[0025] Figure 5 This is a schematic diagram of a positive electrode structure;

[0026] Figure 6 This is a schematic diagram of a solid-state battery.

[0027] Figure 7 This is a flowchart of an electrode preparation method provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Electrode preparation apparatus; 10. First unwinding mechanism; 20. Cutting mechanism; 21. Back roller; 22. Die-cutting roller; 30. Composite mechanism; 31. First hot press roller; 32. Second hot press roller; 40. Second unwinding mechanism; 50. Waste collection mechanism; 60. First winding mechanism; 70. Second winding mechanism; 200. First strip; 201. Current collector; 2011. Coating area; 2012. Uncoated area; 2013. Tab area; 202. Positive electrode coating; 300. Second strip; 301. Base film layer; 302. Insulating layer; 3021. First region; 3022. Second region; 303. Barrier layer; 3031. Third region; 3032. Fourth region; 400. Positive electrode strip; 500. Positive electrode sheet; 600. Negative electrode sheet; 700. Solid electrolyte layer. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] See Figure 1 One embodiment of this application provides an electrode preparation apparatus 100, which includes a first unwinding mechanism 10 for unwinding and outputting a first strip 200. (See reference...) Figure 2 and Figure 3 The first strip 200 has a current collector 201 and a positive electrode coating 202. The current collector 201 has a coated area 2011 and an uncoated area 2012. Specifically, there are multiple coated areas 2011, which are spaced apart from each other, and the positive electrode coating 202 is applied to the coated areas 2011. Typically, the first strip 200 is a strip formed after drying and rolling processes.

[0037] Uncoated areas 2012 are arranged around multiple coated areas 2011. Specifically, the coated areas 2011 are surrounded by uncoated areas 2012, that is, each coated area 2011 is surrounded by uncoated areas 2012, and the uncoated areas 2012 are in a continuous frame shape. Optionally, the current collector 201 can be aluminum foil, and a positive electrode coating 202 is formed on the current collector 201 by intermittent coating. The intermittent coating method allows empty foil space to flow around the positive electrode coating 202 (active material layer), so that each coated area 2011 is surrounded by uncoated areas 2012.

[0038] Continue reading Figure 1 The electrode preparation apparatus 100 also includes a cutting mechanism 20 for cutting a second strip 300. Specifically, the second strip 300 includes an insulating layer 302, which is formed using an insulating material. When cutting the second strip 300, the cutting mechanism 20 can cut the insulating layer 302 to form a first region 3021 and a second region 3022 that are separable from each other. (See reference...) Figure 4 There are multiple first regions 3021, which are spaced apart from each other and correspond one-to-one with the coating regions 2011. That is, the number of first regions 3021 corresponds to the number of coating regions 2011, and the shape and size of the corresponding first regions 3021 and coating regions 2011 are matched. For example, when the coating region 2011 is a square region, the first region 3021 is also a square region of equal area. The second region 3022 is a continuous region that can surround multiple first regions 3021. The second region 3022 is corresponding to the uncoated region 2012, and the second region 3022 is also a frame structure. The shape and size of the second region 3022 are matched with the uncoated region 2012.

[0039] For some specific implementation methods, please refer to [link / reference]. Figure 2 and Figure 3 The area of ​​the second region 3022 is smaller than the area of ​​the uncoated region 2012, so that a tab region 2013 for forming a tab is formed on the uncoated region 2012 of the finally formed positive electrode strip 400 (hereinafter). Thus, when the positive electrode strip 400 is cut to form a positive electrode sheet 500, the corresponding tab region 2013 forms the tab of the positive electrode sheet 500.

[0040] Continue reading Figure 1The electrode preparation apparatus 100 further includes a composite mechanism 30, located downstream of the first unwinding mechanism 10 and the cutting mechanism 20, for compositely bonding the uncoated region 2012 of the first strip 200 and the second region 3022 of the insulating layer 302 of the second strip 300 to form a positive electrode strip 400 having multiple positive electrode regions. Each positive electrode region includes at least a portion of a coated region 2011 and at least a portion of an uncoated region 2012 surrounding the coated region 2011. Cutting the positive electrode strip 400 corresponding to each positive electrode region can form a positive electrode 500 (see reference). Figure 5 ).

[0041] It should be noted that one coating area 2011 can correspond to one positive electrode area or multiple positive electrode areas, and this is not limited here.

[0042] The electrode preparation apparatus 100 provided in this application includes a first unwinding mechanism 10 that unwinds and outputs a first material strip 200, a cutting mechanism 20 that can cut the insulating layer 302 of the second material strip 300 into multiple first regions 3021 and continuous second regions 3022, such that the multiple first regions 3021 correspond one-to-one with multiple coated regions 2011, and the continuous second regions 3022 correspond to the uncoated regions 2012, and a composite mechanism 30 that can composite the second regions 3022 of the insulating layer 302 with the uncoated regions 2012 of the first material strip 200 to form a positive electrode material strip 400 having multiple positive electrode regions. Since each positive electrode region includes at least a portion of a coated region 2011 and at least a portion of a non-coated region 2012 surrounding the coated region 2011, each positive electrode region forms a corresponding positive electrode 500 when the positive electrode strip 400 is cut. The positive electrode coating 202 of the thus formed positive electrode 500 has an insulating layer 302 around its periphery. Compared to the prior art where only the positive electrode coating 202 exists, the insulating layer 302 can fill the empty area at the edge of the stacked cell when the cells are stacked to form a solid-state battery (see [reference]). Figure 6 Thus, when a large pressure is applied to the stacked cell in a direction perpendicular to the plane where the electrode is located, since at least part of the empty area is filled by the insulating layer 302, the problem of uneven force and stress concentration in the empty area is reduced, enabling the solid-state battery to meet the pressure requirements of large pressure.

[0043] In some embodiments, the positive electrode coating 202 of the positive electrode sheet 500 is surrounded by an insulating layer 302, that is, the insulating layer 302 is arranged in a ring shape around the positive electrode coating 202. The thickness of the insulating layer 302 is equal to the thickness of the positive electrode coating 202, ensuring that when the positive electrode sheet 500 is formed, the insulating layer 302 and the positive electrode coating 202 are flush with the surface away from the current collector 201, so as to facilitate full contact with the solid electrolyte layer 700. In this way, the surrounding void layer can be filled, which is equivalent to the void layer no longer existing, and can completely solve the problems of uneven force and stress concentration, so that the solid-state battery can meet the pressure requirements of higher pressure. At the same time, this arrangement can also ensure that the positive electrode coating 202 can be completely covered by the solid electrolyte layer 700, preventing short circuits.

[0044] It is conceivable that in other embodiments, further reference will be made. Figure 5 Alternatively, the insulating layer 302 can be provided only on one or more circumferential sides of the positive electrode coating 202, which is not limited here. At the same time, the thickness of the insulating layer 302 can be slightly greater or slightly less than the thickness of the positive electrode coating 202, which is also not limited here.

[0045] Furthermore, the insulating layer 302 is an adhesive insulating layer. Thus, when the electrodes are stacked to form a solid-state battery, the positive electrode 500 can be bonded to the solid electrolyte layer 700 through the adhesive insulating layer 302, ensuring a firm connection between the positive electrode 500 and the solid electrolyte layer 700. This reduces slippage between the positive electrode 500 and the solid electrolyte layer 700, lowers the risk of short circuits in the solid-state battery, and guarantees its safety performance.

[0046] In some embodiments, see further reference. Figure 1 The electrode preparation apparatus 100 includes two cutting mechanisms 20, each used to cut two second strips 300. A laminating mechanism 30 is used to laminate the second regions 3022 of the insulating layers 302 of the two second strips 300 to both sides of the uncoated region 2012 of the first strip 200, respectively, to form a positive electrode strip 400. Thus, the insulating layer 302 can be laminated to both sides of the first strip 200 formed by double-sided coating, resulting in an insulating layer 302 forming around the positive electrode coating 202 on both sides of the formed positive electrode 500.

[0047] It is conceivable that in other embodiments, the electrode preparation apparatus 100 may also include only one cutting mechanism 20, which is capable of cutting one second strip 300, or one cutting mechanism 20 can move between two stations to meet the requirement of cutting two second strips 300.

[0048] The electrode preparation apparatus 100 further includes a second unwinding mechanism 40, which is located upstream of the cutting mechanism 20 for unwinding and outputting the second strip 300. Optionally, when there are two cutting mechanisms 20, there are also two second unwinding mechanisms 40, with one second unwinding mechanism 40 located upstream of each cutting mechanism 20. The second strip 300 unwound by the second unwinding mechanism 40 is then fed to its corresponding cutting mechanism 20 for cutting.

[0049] Further reading Figure 1 The cutting mechanism 20 includes a back roller 21 and a die-cutting roller 22. A cutting gap is formed between the back roller 21 and the die-cutting roller 22 for the second material strip 300 to pass through. The back roller 21 is used to support the second material strip 300, and the die-cutting roller 22 is used to cut the insulating layer 302 of the second material strip 300 to form a first region 3021 and a second region 3022. Specifically, the die-cutting roller 22 is a special roller that can cut the insulating layer 302 of the second material strip 300 to form a specially shaped first region 3021 and a second region 3022 to meet the requirements.

[0050] In some embodiments, see further reference. Figure 4 The second strip 300 also includes a base film layer 301 and a barrier layer 303, with an insulating layer 302 sandwiched between the base film layer 301 and the barrier layer 303. The base film layer 301 can be made of polymer materials such as PET and PI, or metal materials such as aluminum foil and stainless steel foil. The barrier layer 303 can be made of polymer materials such as PET, and has no adhesive ability on the outside; its function is to block the adhesive ability of the insulating layer 302 it covers. The cutting mechanism 20 is used to cut the second strip 300, and the cutting depth is the sum of the thicknesses of the barrier layer 303 and the insulating layer 302. After being cut by the cutting mechanism 20, the barrier layer 303 forms a third region 3031 and a fourth region 3032. The third region 3031 corresponds one-to-one with the first region 3021, and the fourth region 3032 corresponds to the second region 3022. When the cutting mechanism 20 cuts the barrier layer 303 and the insulating layer 302 of the second strip 300, the base film layer 301 serves as a support and positioning layer, which facilitates the control of the tension of the second strip 300 and reduces the risk of strip breakage.

[0051] The electrode preparation apparatus 100 also includes a peeling mechanism (not shown in the figure), which is located between the cutting mechanism 20 and the composite mechanism 30. The peeling mechanism is used to peel off the fourth region 3032 of the barrier layer 303. After peeling off the fourth region 3032, the second region 3022 separates from the base film layer 301 when passing through the composite mechanism 30 and is transferred onto the first material strip 200 to be composited with it. Since the peeling mechanism tears the fourth region 3032 off the second region 3022, the second region 3022 is exposed to the outside while the first region 3021 is still blocked by the barrier layer 303. When passing through the composite mechanism 30, the exposed second region 3022 is composited with the uncoated region 2012 of the first material strip 200 to form the positive electrode material strip 400.

[0052] Further reading Figure 1 The electrode preparation apparatus 100 also includes a waste collection mechanism 50, which is located between the cutting mechanism 20 and the composite mechanism 30 to collect the stripped fourth region 3032. Specifically, the waste collection mechanism 50 is provided in a one-to-one correspondence with the second unwinding mechanism 40, that is, each second unwinding mechanism 40 is provided with a corresponding waste collection mechanism 50.

[0053] In other embodiments, the second strip 300 may omit the base film layer 301 and the barrier layer 303, and only include the insulating layer 302, which can reduce material consumption and save costs. When the second strip 300 only includes the insulating layer 302, after the cutting mechanism 20 cuts the second strip 300, the first region 3021 and the second region 3022 can be separated. The first region 3021 is collected, and the second region 3022 is conveyed to the composite mechanism 30 to be composited with the first strip 200.

[0054] In some embodiments, the electrode preparation apparatus 100 further includes a positioning and correction mechanism (not shown in the figure). The positioning and correction mechanism is located upstream of the composite mechanism 30 and is used to correct the alignment of the first material strip 200 and / or the second material strip 300 before the uncoated area 2012 of the first material strip 200 and the second area 3022 of the insulating layer 302 are composited, so as to ensure accurate alignment of the uncoated area 2012 and the second area 3022 and guarantee the composite effect.

[0055] Continue reading Figure 1The composite mechanism 30 includes a first hot-pressing roller 31 and a second hot-pressing roller 32. A hot-pressing gap is formed between the first hot-pressing roller 31 and the second hot-pressing roller 32 for the first material strip 200 and the second material strip 300 to pass through. The first hot-pressing roller 31 and the second hot-pressing roller 32 cooperate to composite the second region 3022 with the uncoated region 2012 of the first material strip 200. Optionally, the insulating layer 302 material can be a pressure-sensitive adhesive, a heat-sensitive adhesive, or a combination of both. When the insulating layer 302 material is a heat-sensitive adhesive, the base film layer 301 material needs to be a heat-resistant material, or a material that maintains stable mechanical properties and material characteristics at the corresponding hot-pressing temperature.

[0056] In some embodiments, the electrode preparation apparatus 100 further includes a first winding mechanism 60 for winding the positive electrode strip 400 to facilitate subsequent processes, such as facilitating the subsequent cutting of the positive electrode strip 400 to form the positive electrode sheet 500.

[0057] Furthermore, the electrode preparation apparatus 100 also includes a second winding mechanism 70, which is used to wind up the second strip 300 after the second region 3022 and the first strip 200 are combined, for recycling. The second winding mechanism 70 and the second unwinding mechanism 40 are arranged in a one-to-one correspondence.

[0058] See Figure 7 Another embodiment of this application also provides a method for preparing an electrode, including the following steps:

[0059] S110: Unwind and output the first material strip 200. The first material strip 200 has a current collector 201 and a positive electrode coating 202. The current collector 201 has a plurality of spaced coating areas 2011 and a non-coating area 2012 surrounding the plurality of coating areas 2011. The positive electrode coating 202 is located in the coating areas 2011.

[0060] S120: Cut the second strip 300 so that the insulating layer 302 of the second strip 300 forms a plurality of mutually spaced first regions 3021 and continuous second regions 3022. The first regions 3021 are set in a one-to-one correspondence with the coating regions 2011, and the second regions 3022 correspond to the uncoated regions 2012.

[0061] The number of coating areas 2011 corresponds to the number of first areas 3021, and the shape and size of the corresponding first areas 3021 match those of the coating areas 2011. For example, when the coating area 2011 is a square area, the first area 3021 is also a square area of ​​equal area. The second area 3022 is a continuous area that can surround multiple first areas 3021. The second area 3022 is set corresponding to the uncoated area 2012, and the second area 3022 is also a frame structure. The shape and size of the second area 3022 match those of the uncoated area 2012.

[0062] S130: The second region 3022 of the insulating layer 302 is laminated to the uncoated region 2012 of the first strip 200 to form a positive electrode strip 400 having a plurality of positive electrode regions, each positive electrode region including at least a portion of a coated region 2011 and at least a portion of the uncoated region 2012 surrounding the coated region 2011.

[0063] Furthermore, the electrode preparation method also includes the following steps:

[0064] Each positive electrode area is cut into a positive electrode strip 400 to form a positive electrode 500.

[0065] In some embodiments, the first strip 200 is formed by single-sided coating, and a second region 3022 is laminated on the front side of the first strip 200. In other embodiments, the second strip 200 is formed by double-sided coating, and the second region 3022 is laminated on both the front and back sides of the first strip 200, so that an insulating layer 302 is formed on the outer periphery of the positive electrode coating 202 on both sides of the formed positive electrode sheet 500.

[0066] The electrode preparation method provided in this application includes a positive electrode region comprising at least a portion of a coated region 2011 and at least a portion of a non-coated region 2012 surrounding the coated region 2011. When the positive electrode strip 400 is cut, each positive electrode region forms a corresponding positive electrode 500. The positive electrode coating 202 of the positive electrode 500 thus formed has an insulating layer 302 around its periphery. Compared to the prior art where only the positive electrode coating 202 exists, the insulating layer 302 can fill the empty areas at the edge of the stack when the solid-state battery is formed by stacking. Thus, when a large pressure is applied to the stacked cell in a direction perpendicular to the plane of the electrode, the problem of uneven stress and stress concentration in the empty areas is reduced because at least a portion of the empty areas are filled by the insulating layer 302, enabling the solid-state battery to meet the pressure requirements of higher pressure.

[0067] Furthermore, the insulating layer 302 is an adhesive insulating layer. Thus, when the electrodes are stacked to form a solid-state battery, the positive electrode 500 can be bonded to the solid electrolyte layer 700 through the adhesive insulating layer 302, ensuring a firm connection between the positive electrode 500 and the solid electrolyte layer 700. This reduces slippage between the positive electrode 500 and the solid electrolyte layer 700, lowers the risk of short circuits in the solid-state battery, and guarantees its safety performance.

[0068] In some specific embodiments, the area of ​​the second region 3022 is smaller than the area of ​​the uncoated region 2012, so that a tab region 2013 for forming a tab is formed on the uncoated region 2012 of the finally formed positive electrode strip 400. Thus, when the positive electrode strip 400 is cut to form a positive electrode sheet 500, the corresponding tab region 2013 forms the tab of the positive electrode sheet 500.

[0069] In some embodiments, the first tape 200 only includes the insulating layer 302, which reduces material consumption and saves costs. When the second tape 300 only includes the insulating layer 302, after the second tape 300 is cut, the first region 3021 and the second region 3022 can be separated, the first region 3021 is collected, and the second region 3022 is combined with the first tape 200.

[0070] In other embodiments, the second strip 300 further includes a base film layer 301 and a barrier layer 303, with an insulating layer 302 sandwiched between the base film layer 301 and the barrier layer 303.

[0071] Step S120 includes:

[0072] Cut the insulating layer 302 and the barrier layer 303 of the second strip 300 so that the barrier layer 303 forms a third region 3031 and a fourth region 3032 corresponding to the first region 3021 and the second region 3022, respectively.

[0073] Before step S130, it also includes

[0074] Peel off the fourth region 3032 on the second region 3022;

[0075] Step S130 includes:

[0076] After peeling off the fourth region 3032, the second region 3022 is separated from the base film layer 301 and transferred onto the first material strip 200 to be combined with the first material strip 200 to form the positive electrode material strip 400.

[0077] With the above configuration, when cutting the barrier layer 303 and the insulating layer 302 of the second strip 300, the base film layer 301 serves as a support and positioning layer, which facilitates the control of the tension of the second strip 300 and reduces the risk of strip breakage.

[0078] In some embodiments, prior to step S130, the method further includes:

[0079] The first material strip 200 and the second material strip 300 are corrected. In this way, the first material strip 200 and / or the second material strip 300 are corrected before the uncoated area 2012 of the first material strip 200 and the second area 3022 of the insulating layer 302 are laminated, so as to ensure accurate alignment of the uncoated area 2012 and the second area 3022 and guarantee the lamination effect.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode tab preparation device, characterized by, The application relates to a positive electrode tab preparation device. The device comprises a first unwinding mechanism (10) for unwinding and outputting a first material belt (200), the first material belt (200) comprising a current collector (201) and a positive electrode coating (202), the current collector (201) comprising a plurality of spaced-apart coating areas (2011) and non-coating areas (2012) surrounding the coating areas (2011), and the positive electrode coating (202) being located on the coating areas (2011); The device further comprises a cutting mechanism (20) for cutting a second material belt (300) so that an insulating layer (302) of the second material belt (300) forms a plurality of mutually spaced first areas (3021) and a continuous second area (3022), the first areas (3021) being arranged one by one corresponding to the coating areas (2011), and the second area (3022) corresponding to the non-coating areas (2012); The device further comprises a composite mechanism (30) for compositing the second area (3022) of the insulating layer (302) to the non-coating area (2012) of the first material belt (200) and forming a positive electrode material belt (400) comprising a plurality of positive electrode tab areas, each of the positive electrode tab areas comprising at least part of the coating area (2011) and at least part of the non-coating area (2012) surrounding the coating area (2011).

2. The pole piece preparation apparatus of claim 1, wherein The device comprises two cutting mechanisms (20) for cutting two second material belts (300) respectively. The composite mechanism (30) is used for compositing the second area (3022) of the insulating layer (302) of the two second material belts (300) to the positive and negative surfaces of the non-coating area (2012) of the first material belt (200) respectively to form the positive electrode material belt (400).

3. The pole piece preparation apparatus of claim 1, wherein The cutting mechanism (20) comprises a back roller (21) and a die cutting roller (22), a cutting gap for the second material belt (300) to pass through being formed between the back roller (21) and the die cutting roller (22), the back roller (21) being used for supporting the second material belt (300), and the die cutting roller (22) being used for cutting the second material belt (300) to form the first areas (3021) and the second area (3022).

4. The pole piece preparation apparatus of claim 1, wherein The composite mechanism (30) comprises a first hot pressing roller (31) and a second hot pressing roller (32), a hot pressing gap for the first material belt (200) and the second material belt (300) to pass through being formed between the first hot pressing roller (31) and the second hot pressing roller (32), and the first hot pressing roller (31) and the second hot pressing roller (32) being matched so that the second area (3022) is composited with the non-coating area (2012) of the first material belt (200).

5. The pole piece preparation apparatus of claim 1, wherein The pole piece preparation device further comprises a positioning and deviation correction mechanism located upstream of the composite mechanism (30) for correcting deviation of the first material belt (200) and / or the second material belt (300) before the non-coated area (2012) of the first material belt (200) and the second area (3022) of the insulating layer (302) are compounded.

6. The pole piece preparation apparatus of claim 1, wherein The pole piece preparation device further comprises a second unwinding mechanism (40) located upstream of the cutting mechanism (20) for unwinding and outputting the second material belt (300).

7. The pole piece preparation apparatus of claim 1, wherein The pole piece preparation device further comprises a first winding mechanism (60) located downstream of the composite mechanism (30) for winding the positive material belt (400).

8. The pole piece preparation apparatus according to any one of claims 1 to 7, characterized in that, The second material belt (300) further comprises a base film layer (301) and a barrier layer (303), and the insulating layer (302) is sandwiched between the base film layer (301) and the barrier layer (303), and the cutting mechanism (20) is used to cut the barrier layer (303) and the insulating layer (302), and the barrier layer (303) forms a third area (3031) and a fourth area (3032) corresponding to the first area (3021) and the second area (3022) respectively. The pole piece preparation device further comprises a stripping mechanism located between the cutting mechanism (20) and the composite mechanism (30) for stripping the fourth area (3032) of the barrier layer (303), and after the fourth area (3032) is stripped, the second area (3022) is separated from the base film layer (301) when passing through the composite mechanism (30) and is transferred to the first material belt (200) to be compounded with the first material belt (200).

9. The pole piece preparation apparatus of claim 8, wherein The pole piece preparation device further comprises a waste collecting mechanism (50) located between the cutting mechanism (20) and the composite mechanism (30) for collecting the fourth area (3032).

10. The pole piece preparation apparatus of claim 8, wherein The pole piece preparation device further comprises a second winding mechanism (70) for winding the second material belt (300) compounded with the first material belt (200) in the second area (3022).

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