Battery pole piece compression roller and compression equipment

Abstract

The utility model relates to battery manufacturing technical field, specifically disclose battery pole piece compression roller and roller press equipment, the battery pole piece compression roller includes compression roller main part and compression roller convex ring, is provided with first area and second area for being used for contacting the blank area of battery pole piece with the coating area of battery pole piece on compression roller main part, first area and second area are sequentially arranged along the axial direction of compression roller main part, the second area of compression roller main part is around set up, and compression roller convex ring is set up relative to first area convex. Compression roller main part carries out roller pressing to coating area, and compression roller convex ring carries out roller pressing to blank area, and then promotes the ductility of coating area and the ductility of blank area to be close to each other, avoids the roller pressure difference that coating area and blank area receive, so that the extension of blank area is not enough, and then leads to the problem that blank area appears wrinkle, bulge and broken strip, improves the appearance quality of battery pole piece, avoids destroying the integrity of battery pole piece internal structure, guarantees the subsequent battery assembly process quality and final product performance.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to battery electrode pressing rollers and pressing equipment. Background Technology

[0002] The manufacturing process of lithium battery electrode sheets mainly includes: mixing raw materials such as active materials, binders and conductive agents in a specific weight ratio to prepare a uniform slurry, then uniformly coating the slurry on the surface of aluminum foil or copper foil current collector as required, pressing it into an electrode film of the target thickness by a rolling equipment, and then drying it to form a battery electrode sheet.

[0003] In the above process flow, rolling is the core compaction process in the manufacturing of lithium battery electrodes. Its mechanism of action is mainly reflected in two aspects: on the one hand, by compressing the thickness of the battery electrode, it effectively improves the cell volume utilization rate and assembly performance, thereby directly improving the energy density of the battery; on the other hand, the rolling process significantly affects the interfacial bonding strength between the active material and the current collector, while optimizing the pore distribution structure among the active material, conductive agent and binder inside the battery electrode. These changes in microstructure ultimately determine the various electrochemical performance indicators of the battery.

[0004] However, when the battery electrode passes through the battery electrode pressure roller, the height difference between the coated area and the blank area of ​​the battery electrode results in different roller pressures on the coated area and the blank area. As a result, the blank area does not extend enough, leading to wrinkles, bulges and strip breaks in the blank area. This problem not only affects the appearance quality of the battery electrode, but more importantly, it may damage the integrity of the internal structure of the battery electrode, thus adversely affecting the subsequent battery assembly process and the performance of the final product.

[0005] Therefore, how to effectively solve the problems of wrinkles, bulges and strip breaks in the blank area of ​​battery electrodes during the rolling process has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to provide a battery electrode pressing roller and rolling equipment to solve the problems of wrinkles, bulges and strip breaks in the blank area of ​​battery electrodes during the rolling process in related technologies.

[0007] On one hand, this utility model provides a battery electrode pressing roller, which includes:

[0008] The pressure roller body has a first area for contacting the coating area of ​​the battery electrode and a second area for contacting the blank area of ​​the battery electrode, and the first area and the second area are arranged sequentially along the axial direction of the pressure roller body.

[0009] A pressure roller convex ring is surrounded on the second region of the pressure roller body, and the pressure roller convex ring protrudes relative to the first region.

[0010] On the other hand, this utility model provides a rolling equipment, including the battery electrode pressing roller in any of the above-mentioned embodiments.

[0011] The beneficial effects of this utility model are as follows:

[0012] This utility model provides a battery electrode pressing roller and a pressing device. The battery electrode pressing roller includes a pressing roller body and a pressing roller convex ring. The pressing roller body is provided with a first area for contacting the coating area of ​​the battery electrode and a second area for contacting the blank area of ​​the battery electrode. The first area and the second area are arranged sequentially along the axial direction of the pressing roller body. The pressing roller convex ring is arranged around the second area of ​​the pressing roller body and protrudes relative to the first area. When the rolling equipment equipped with the battery electrode pressing roller is working, the battery electrode passes through the battery electrode pressing roller. At this time, the first zone is opposite to the coated area of ​​the battery electrode, and the second zone is opposite to the uncoated area of ​​the battery electrode, so that the pressing roller convex ring is opposite to the uncoated area of ​​the battery electrode. During the rolling process of the battery electrode pressing roller, the pressing roller body rolls the coated area, and the pressing roller convex ring rolls the uncoated area. This promotes the consistency of the extensibility of the coated area and the uncoated area, avoids the difference in the rolling pressure between the coated area and the uncoated area, and avoids insufficient extensibility of the uncoated area, which would lead to wrinkles, bulges and strip breaks in the uncoated area. This improves the appearance quality of the battery electrode, avoids damage to the integrity of the internal structure of the battery electrode, and ensures the quality of subsequent battery assembly processes and the performance of the final product. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a battery electrode in the prior art;

[0014] Figure 2 This is a schematic diagram of the structure of the battery electrode pressure roller in this embodiment of the present invention. Figure 1 ;

[0015] Figure 3 This is a schematic diagram of the structure of the battery electrode pressure roller in this embodiment of the present invention. Figure 2 ;

[0016] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0017] In the picture:

[0018] 100. Battery electrode sheet; 101. Coated area; 102. Blank area; 103. Coating layer; 104. Tab adhesive;

[0019] X, first direction;

[0020] 1. Pressure roller body; 11. First zone;

[0021] 2. Pressure roller convex ring; 21. Convex ring body; 22. Stepped structure. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] Example 1

[0027] like Figure 1 As shown, a complete battery consists of battery electrode 100 (positive electrode + negative electrode), electrolyte, separator, and casing. Battery electrode 100 is the core functional component of the battery. Battery electrode 100, electrolyte, and separator together form a "cell" unit.

[0028] The battery electrode 100 is composed of conductive materials, active materials, and binders. The manufacturing process of the battery electrode 100 mainly includes: mixing raw materials such as active materials, binders, and conductive agents in a specific weight ratio to prepare a uniform slurry; then uniformly coating the slurry onto the surface of an aluminum foil or copper foil current collector according to the preset areal density requirements of the battery electrode 100; and finally drying the slurry to remove the solvent and form the battery electrode 100. In subsequent processes, the rolled battery electrode 100 is continuously rolled to a specified thickness using a roll press, and finally the slitting and tab forming processes are completed.

[0029] During the 100-roll pressing process of battery electrodes, the electrode pressing rollers apply high pressure to compact the coating material, reducing porosity and increasing tap density, thereby enhancing the structural stability and volumetric energy density of the electrode. Simultaneously, the electrode pressing rollers precisely control the electrode thickness to ensure electrode compatibility and prevent powder shedding by enhancing the adhesion between the coating and the current collector, thus improving mechanical strength. Their smooth surface also improves coating flatness, reduces interface defects, and optimizes the electric field distribution. Furthermore, rolling eliminates air bubbles and residual solvents in the coating, improving electrochemical performance (such as shortening ion transport paths, reducing internal resistance, and enhancing rate performance). Strict control of pressure, temperature, and roller material is required during the process to avoid over-compaction or damage to the electrode, ensuring battery performance and consistency.

[0030] The battery electrode 100 consists of a coating area 101 (the area where the slurry is coated) and a blank area 102 (the area without foil).

[0031] Coating area: Coated with positive and negative electrode slurries, it is the core area for energy storage. The slurry layer coated on the coating area is called the coating layer.

[0032] Blank area: The area where no paste is applied is the exposed area of ​​copper foil (negative electrode) or aluminum foil (positive electrode), which is used for subsequent processes such as welding tabs, positioning and cutting, and thermal bonding.

[0033] However, due to the height difference between the coating area 101 and the blank area 102 of the battery electrode 100, the roller pressure on the coating area 101 and the blank area 102 is different, resulting in insufficient extension of the blank area 102. This leads to problems such as wrinkles, bulges and strip breaks in the blank area 102. This problem not only affects the appearance quality of the battery electrode 100, but more importantly, it may damage the integrity of the internal structure of the battery electrode 100, thus adversely affecting the subsequent battery assembly process and the performance of the final product.

[0034] To solve the above problems, such as Figure 2 and Figure 3 As shown, this embodiment provides a battery electrode pressing roller, which includes a roller body 1 and a roller convex ring 2. The roller body 1 is provided with a first region 11 for contacting the coating area 101 of the battery electrode 100 and a second region for contacting the blank area 102 of the battery electrode 100. The first region 11 and the second region are arranged sequentially along the axial direction of the roller body 1. The roller convex ring 2 is wound around the second region of the roller body 1 and protrudes relative to the first region 11. When the rolling equipment equipped with this battery electrode pressing roller is working, the rolling equipment is equipped with the battery electrode pressing roller of this application and a support roller opposite to it. The battery electrode 100 passes between the battery electrode pressing roller and the support roller opposite to it, wherein the side of the battery electrode pressing roller opposite to the side with the coating layer is opposite, and the surface of the support roller is a flat structure without protrusions. The battery electrode 100 passes through the battery electrode pressing roller. At this time, the first region 11 is opposite to the coating area 101 of the battery electrode 100, and the second region is opposite to the blank area 102 of the battery electrode 100, so that the pressing roller convex ring 2 is opposite to the blank area 102 of the battery electrode 100. During the process of the battery electrode pressing roller pressing the battery electrode 100, the pressing roller body 1 presses the coating area 101, and the pressing roller convex ring 2 presses the blank area 102. This promotes the consistency of the extensibility of the coating area 101 and the blank area 102, avoids the coating area 101 and the blank area 102 being subjected to different rolling pressures, so that the blank area 102 is not sufficiently extensible, which would lead to wrinkles, bulges and broken strips in the blank area 102. This improves the appearance quality of the battery electrode 100, avoids damage to the integrity of the internal structure of the battery electrode 100, and ensures the quality of subsequent battery assembly processes and the performance of the final product.

[0035] In the battery electrode sheet 100, tab adhesive 104 is provided on both sides of the coating area 101. The tab adhesive 104 is located in the blank areas 102 on both sides of the coating area 101. The upper surface of the tab adhesive 104 is sloped. If the cross-section of the pressure roller convex ring 2 is rectangular, when the pressure roller convex ring 2 rolls the part of the blank area 102 where the tab adhesive 104 is provided, it is very easy for the extensibility of this position to be different from the extensibility of other positions in the blank area 102 and the coating area 101. It is very easy for the area where the tab adhesive 104 is provided to be over-rolled, which in turn leads to wrinkles, bulges and strip breaks in the blank area 102. To solve this problem, optionally, the first direction X is the axial direction along the main body 1 of the pressure roller; the pressure roller convex ring 2 includes a convex ring body 21 and transition sections respectively disposed on both sides of the convex ring body 21 along the first direction X. The height of the end of the transition section near the convex ring body 21 protruding into the first region 11 is not greater than the height of the convex ring body 21 protruding into the first region 11, and the height of the end of the transition section away from the convex ring body 21 protruding into the first region 11 is greater than or equal to 0.

[0036] In this embodiment, the tab adhesive 104 is formed in the blank area 102 and contacts the coating layer 103 of the coating area 101. In order to make the pressure roller convex ring 2 cooperate with the tab adhesive 104 on both sides of the blank area 102, transition sections are respectively provided on both sides of the convex ring body 21 along the first direction X. The thickness of the tab adhesive 104 near the coating layer 103 is greater than the thickness of the tab adhesive 104 away from the coating layer 103, and the thickness of the transition section near the convex ring body 21 is greater than the thickness of the transition section away from the convex ring body 21. This makes the roller pressure acting on the corresponding tab adhesive 104 by the transition section more uniform, so as to ensure the consistency of the extensibility of the entire battery electrode sheet 100 and avoid problems such as wrinkles, bulges and strip breaks.

[0037] Optionally, the transition section is configured as a stepped structure 22; the surface of the stepped structure 22 away from the first region 11 is parallel to the first direction X, and the distance of the protrusion of the stepped structure 22 from the first region 11 is less than the distance of the protrusion of the convex ring body 21 from the first region 11. In this embodiment, the stepped structure 22 ensures that the pressure on the location of the tab rubber 104 is always along the radial direction of the pressure roller body 1, avoiding the location of the tab rubber 104 being subjected to forces in other directions.

[0038] Optionally, the stepped structure 22 includes an innermost step, a middle step, and an outermost step arranged sequentially. The middle step may be omitted or at least one layer may be provided. The distance between the outermost steps of the two stepped structures 22 on the pressure roller convex ring 2 and the distance between their farthest sides is consistent with the width difference between the blank area 102 and the two side tab rubbers 104. The distance between the innermost steps of the two stepped structures 22 on the pressure roller convex ring 2 and the distance between their farthest sides is greater than or equal to the width of the blank area 102.

[0039] Optionally, the width of the stepped structure 22 along the first direction X is a, in mm, where 1 ≤ a ≤ 5. In this embodiment, if the width of the stepped structure 22 along the first direction X is too large, it can easily damage the coating layer; if the width of the stepped structure 22 along the first direction X is too small, the roller pressure acting on the tab adhesive 104 will be uneven, which can easily cause wrinkles, bulges, and tape breaks in the blank area 102. Therefore, 1 ≤ a ≤ 5.

[0040] For example, the value of a can be one of 1, 2, 3, 4, and 5.

[0041] Optionally, the stepped structure 22 has at least two steps. Among two adjacent steps on the same side of the convex ring body 21, the step farther from the convex ring body 21 protrudes from the first area 11 at a lower height than the step closer to the convex ring body 21. Of course, the stepped structure 22 may also have only one step. In this embodiment, the stepped structure 22 with at least two steps is better suited to the shape of the tab adhesive 104 coating than the stepped structure 22 with only one step, and the roller pressure change is more uniform, resulting in a better roller pressing effect on the tab adhesive 104.

[0042] Optionally, the width of a single step along the first direction X is e. In this embodiment, if the width of the step along the first direction X is too large, the area of ​​the single step acting on the tab adhesive 104 will be too large, which will easily cause excessive local roller pressure, and thus easily lead to local wrinkles, bulges and tape breakage. If the width of the step along the first direction X is too small, there will be a problem of high processing cost. Therefore, the unit of e is mm. When 1≤e≤5, it can effectively avoid wrinkles, bulges and tape breakage in the blank area 102.

[0043] For example, the value of the width e of a single step along the first direction X is one of 1, 2, 3, 4 and 5.

[0044] like Figure 3 and Figure 4 As shown, optionally, the widths of two adjacent steps on the same side of the convex ring body 21 along the first direction X are a1 and a2, respectively, where the units of a1 and a2 are both mm, 0.5≤a1≤5, 0.5≤a2≤3, 0≤|a1-a2|≤3, and c1=|a1-a2|. In this embodiment, when the value of c1 is too large, it indicates that the roller pressure of the two adjacent steps acting on the tab adhesive 104 is too different, which can easily cause the problem of inconsistent extensibility of the blank area 102. Therefore, c1 needs to satisfy: 0≤c1≤3.

[0045] For example, the value of a1 is one of 0.5, 1, 2, 3, 4 and 5, and the value of a2 is one of 0.5, 1, 2 and 3.

[0046] Optionally, the height difference h1 between the step near the convex ring body 21 and the convex ring body 21, where h1 is in mm and 0.1 ≤ h1 ≤ 2; and / or the height difference h2 between adjacent steps, where h2 is in mm and 0.1 ≤ h2 ≤ 2; and / or the height difference h3 between the step away from the convex ring body 21 and the second region, where h3 is in mm and 0.1 ≤ h3 ≤ 2. If the height difference between adjacent steps of the battery electrode pressure roller and the protrusion of the first region 11 is too large, it will result in excessive local roller pressure on the tab adhesive 104, which can easily lead to excessive local roller pressure, and consequently, problems such as local wrinkles, bulges, and strip breakage. Since there are height differences between the convex ring body 21 and the steps, adjacent steps, and between the steps and the first zone 11, h1, h2, and h3 are all set to be less than or equal to 2. Furthermore, if the height difference between adjacent steps is too small, too many steps are required, leading to high processing costs. Therefore, h1, h2, and h3 are all set to be greater than or equal to 0.1. In summary, by limiting the value range of h1, h2, and h3, the problems of wrinkles, bulges, and strip breaks in the blank area 102 can be effectively avoided, while also considering processing costs.

[0047] For example, h1 takes the value of 0.1, 0.5, 1, 1.5 and 2, h2 takes the value of 0.1, 0.5, 1, 1.5 and 2, and h3 takes the value of 0.1, 0.5, 1, 1.5 and 2.

[0048] Optionally, the pressure roller convex ring 2 is detachably connected to the pressure roller body 1. In this embodiment, since there is an interaction force between the pressure roller convex ring 2 and the battery electrode 100, the wear of the pressure roller convex ring 2 is relatively large with long-term use of the battery electrode pressure roller. Therefore, the pressure roller convex ring 2 is detachably connected to the pressure roller body 1. When the wear of the pressure roller convex ring 2 is relatively large, the pressure roller convex ring 2 can be directly replaced, thereby reducing the use and maintenance cost of the battery electrode pressure roller.

[0049] Optionally, the pressure roller convex ring 2 is a tape winding component. In this embodiment, after determining the position and size of the pressure roller convex ring 2 on the pressure roller body 11, the tape is wound to the designated position on the pressure roller body 11. Different widths of tape are selected according to the number of steps in the stepped structure 22. The spacing between the same level steps of two stepped structures 22 on one pressure roller convex ring 2 corresponds to one type of tape. The selected tapes of different widths are wound a specific number of times in sequence to obtain the required steps.

[0050] Specifically, the height of a single step is h, where h is in mm, the corresponding thickness of the tape is d, where d is in mm, and the number of wraps of the tape is q = h / d.

[0051] Optionally, the tape can be made of Teflon. In this embodiment, Teflon has extremely low surface tension and adheres almost entirely to no substance. The thin-film coating also maintains good non-stick properties, thus preventing adhesion of the coating layer. Teflon can withstand temperatures up to 300°C for short periods, and its typical continuous operating temperature range is -180°C to 260°C. During use, the pressure roller ring 2 is less prone to deformation, ensuring the roller pressure between the blank area 102 and the coating area 101, and improving the durability of the pressure roller ring 2. Teflon has an extremely low coefficient of friction, reducing wear and power consumption between it and the battery electrode 100. Teflon is resistant to corrosion from strong acids, strong alkalis, and organic solvents, preventing corrosion of the coating layer on the battery electrode 100.

[0052] In other embodiments, an annular limiting groove is recessed at the position where the pressure roller protrusion 2 is set on the pressure roller body 1. The pressure roller protrusion 2 includes a first retaining ring and a second retaining ring, which are respectively disposed in the annular limiting groove, so as to provide the pressure roller protrusion 2 on the pressure roller body 1.

[0053] Regarding how the first and second retaining rings are fixed to the pressure roller body 1, optionally, the first and second retaining rings are connected to each other to hold tightly to the pressure roller body 1. For example, one end of the first retaining ring and one end of the second retaining ring are pivotally connected, the other end of the first retaining ring is provided with a clip, and the other end of the second retaining ring is provided with a buckle. The clip and the buckle are engaged, thereby holding the first and second retaining rings tightly to the pressure roller body 1.

[0054] In other embodiments, the first retaining ring and the second retaining ring are detachably connected to the pressure roller body 1 by adhesive bonding or screwing. For example, the annular limiting groove is coated with adhesive, and the first and second retaining rings are disposed within the annular limiting groove, thereby attaching the first and second retaining rings to the pressure roller body 1. Alternatively, the bottom wall of the annular limiting groove has multiple threaded holes, and the first and second retaining rings are respectively provided with countersunk holes. Bolts pass through the countersunk holes and are screwed into the corresponding threaded holes to fix the first and second retaining rings to the pressure roller body 1.

[0055] In other embodiments, instead of the pressure roller convex ring 2 being positioned within an annular limiting groove, multiple limiting pins are protruding from the pressure roller body 1 at the location where the pressure roller convex ring 2 is positioned. These limiting pins are spaced apart circumferentially around the pressure roller body 1. The pressure roller convex ring 2 includes a first retaining ring and a second retaining ring, which are respectively positioned on the pressure roller body 1 and inserted into the corresponding limiting pins to establish the pressure roller convex ring 2 on the pressure roller body 1. The limiting pins restrict the movement of the pressure roller convex ring 2 relative to the pressure roller body 1 along its axial direction.

[0056] Optionally, multiple pressure roller protrusions 2 are provided, and the stepped structures 22 on both sides of the multiple pressure roller protrusions 2 are different, that is, the number of steps, the width a of the stepped structure 22, and the height h of the steps are all different. Since the coating layer 103 thickness H2 of the coating area 101 of the battery electrode 100 of different battery models is different, and the unit of H2 is mm, the size of the tab adhesive 104 on both sides of the corresponding coating layer 103 is also different. Therefore, according to the coating layer 103 thickness H2 of the coating area 101 of the battery electrode 100, the corresponding pressure roller protrusion 2 is selected so that the inclined structure 21 can be adapted to the tab adhesive 104, thereby improving the adaptability of the battery electrode pressure roller.

[0057] Optionally, the pressure roller protrusion ring 2 is provided with a microtexture on its outer peripheral surface opposite to the battery electrode 100. In this embodiment, the pressure roller protrusion ring 2 is used to prepare an array of pits with a diameter of 15μm-50μm on its outer peripheral surface opposite to the battery electrode 100 using femtosecond laser pulses. This reduces the coefficient of friction on the outer peripheral surface of the pressure roller protrusion ring 2, reduces wear on the battery electrode 100, and extends the service life of the battery electrode pressure roller.

[0058] Optionally, the pits that make up the microtexture are arranged in a rectangular array.

[0059] Optionally, the height of the protrusion of the pressure roller convex ring 2 relative to the first region 11 is H1, where H1 is in mm, and the thickness of the coating layer 103 in the coating region 101 is H2, where H2 ≥ H1. In this embodiment, the thickness H2 of the coating layer 103 in the coating region 101 is the thickness of the coating layer 103 on one side of the finished electrode sheet. This setting can effectively prevent the blank area 102 from being subjected to large roller pressure by the pressure roller convex ring 2, thus avoiding a large difference in extensibility between the coating region 101 and the blank area 102, and thereby avoiding problems such as wrinkles, bulges, and strip breaks in the blank area 102.

[0060] Optionally, the width of the tab adhesive 104 along the first direction X is b, and the width of the transition section of the second region along the first direction X is a, where both a and b are in mm, 1≤b≤4, and a≥b. In this embodiment, the above arrangement allows the inclined structure to completely cover the corresponding tab adhesive 104, avoiding the problem of large differences in extensibility in the area covered by the tab adhesive 104, thereby avoiding wrinkles, bulges, and tape breaks in this area.

[0061] For example, b can be one of 1, 2, 3, and 4.

[0062] Alternatively, a = b.

[0063] Optionally, the coefficient of friction between the pressure roller convex ring 2 and the outer peripheral wall opposite to the blank area 102 is μ1, and the coefficient of friction between the pressure roller body 1 and the outer peripheral wall opposite to the coating area 101 is μ2, where μ1 < μ2. In this embodiment, since the blank area 102 is not coated, the friction force of the pressure roller convex ring 2 is relatively small. This setting can reduce the frictional wear of the pressure roller convex ring 2 on the blank area 102. When the coefficient of friction μ2 between the pressure roller body 1 and the outer peripheral wall opposite to the coating area 101 is relatively large, this setting helps the pressure roller body 1 to better compact the coating layer 103 of the coating area 101.

[0064] This embodiment also provides a rolling equipment, including the battery electrode pressing roller in the above scheme.

[0065] Optionally, the rolling equipment also includes a frame, a drive unit, a battery electrode pressing roller, a drive roller, and a driven roller. The drive roller, battery electrode pressing roller, driven roller, and battery electrode passing roller are all rotatably mounted on the frame. The drive unit drives the drive roller to rotate so that the battery electrode 100 moves between the drive roller and the driven roller. The battery electrode pressing roller is used to press the battery electrode 100 thin.

[0066] Example 2

[0067] This embodiment is basically the same as Embodiment 1, except that the pressure roller convex ring 2 and the pressure roller body 1 are integrally formed parts. In this embodiment, the pressure roller convex ring 2 and the pressure roller body 1 can be machined by turning.

[0068] In other embodiments, the electrode rollers can also be manufactured using additive manufacturing or casting processes, which allows for higher manufacturing precision.

[0069] Example 3

[0070] Optionally, the transition section is configured as an inclined structure, and the height of the transition section protruding from the first region 11 in the direction away from the convex ring body 21 gradually decreases. In this embodiment, the inclination direction of the inclined structure is consistent with the inclination direction of the corresponding tab adhesive 104, thereby enabling the roller pressure exerted by the transition section on the corresponding tab adhesive 104 to be more uniform.

[0071] Alternatively, the inclined surface of the inclined structure can also be a plane or a circular arc surface.

[0072] Optionally, the transition section is configured as a stepped structure 22, which includes at least two inclined steps. Among two adjacent steps on the same side of the convex ring body 21, the maximum height of the inclined step protruding from the first region 11 away from the convex ring body 21 is less than the minimum height of the inclined step protruding from the first region 11 closer to the convex ring body 21. The height of the inclined step protruding from the first region 11 gradually decreases along the direction away from the convex ring body 21.

[0073] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery electrode pressing roller, characterized in that, include: The pressure roller body (1) is provided with a first area (11) for contacting the coating area (101) of the battery electrode (100) and a second area for contacting the blank area (102) of the battery electrode (100). The first area (11) and the second area are arranged sequentially along the axial direction of the pressure roller body (1). On both sides of the coating area (101), there are tab adhesives (104) opposite to the corresponding second areas. The tab adhesives (104) have a width of b along the first direction (X) and the axial direction of the pressure roller body (1) is the first direction (X). A pressure roller convex ring (2) is wound around the second region of the pressure roller body (1). The pressure roller convex ring (2) is convex relative to the first region (11). The pressure roller convex ring (2) includes a convex ring body (21) and transition sections respectively disposed on both sides of the convex ring body (21) along the first direction (X). The transition sections are configured as a stepped structure (22). The plane of the stepped structure (22) away from the first region (11) is parallel to the first direction (X), and the distance of the convex structure (22) protruding from the first region (11) is less than the distance of the convex ring body (21) protruding from the first region (11). The width of the transition segment in the second region along the first direction (X) is a, where the units of a and b are both mm, 1≤b≤4, and a≥b; The stepped structure (22) is provided with at least two steps. Among the two adjacent steps on the same side of the convex ring body (21), the step that is far from the convex ring body (21) protrudes into the first area (11) at a height that is less than the step that is close to the convex ring body (21) protruding into the first area (11). The widths of two adjacent steps on the same side of the convex ring body (21) along the first direction (X) are a1 and a2, respectively. The units of a1 and a2 are both mm, 0.5≤a1≤4, 0.5≤a2≤3, and 0≤|a1-a2|≤3.

2. The battery electrode pressing roller according to claim 1, characterized in that, The height of the transition section protruding from the first region (11) at the end closest to the convex ring body (21) is not greater than the height of the convex ring body (21) protruding from the first region (11), and the height of the transition section protruding from the first region (11) at the end furthest from the convex ring body (21) is greater than or equal to 0.

3. The battery electrode pressing roller according to claim 1, characterized in that, The stepped structure (22) has a width of a along the first direction (X), in mm, where 1 ≤ a ≤ 5.

4. The battery electrode pressing roller according to claim 1, characterized in that, The height difference h1 between the step near the convex ring body (21) and the convex ring body (21), where h1 is in mm and 0.1≤h1≤2; and / or the height difference h2 between adjacent steps, where h2 is in mm and 0.1≤h2≤2; and / or the height difference h3 between the step away from the convex ring body (21) and the first area (11), where h3 is in mm and 0.1≤h3≤2.

5. The battery electrode pressing roller according to any one of claims 1-4, characterized in that, The pressure roller convex ring (2) is detachably connected to the pressure roller body (1).

6. The battery electrode pressing roller according to claim 5, characterized in that, The pressure roller protrusion (2) is a tape winding component.

7. The battery electrode pressing roller according to any one of claims 1-4, characterized in that, The pressure roller convex ring (2) and the pressure roller body (1) are integrally formed parts.

8. The battery electrode pressing roller according to claim 1, characterized in that, The height of the raised ring (2) of the pressure roller relative to the first area (11) is H1, and the thickness of the coating layer (103) of the coating area (101) is H2. The units of H1 and H2 are both mm, and H2 ≥ H1.

9. The battery electrode pressing roller according to claim 1, characterized in that, The friction coefficient between the outer peripheral wall of the pressure roller convex ring (2) and the blank area (102) is μ1, and the friction coefficient between the outer peripheral wall of the pressure roller body (1) and the coating area (101) is μ2, where μ1 < μ2.

10. A roller pressing device, characterized in that, Includes the battery electrode pressure roller according to any one of claims 1-9.

Images