Dry electrode preparation device

Abstract

The utility model relates to a dry electrode preparation device which comprises a rolling mechanism, the rolling mechanism comprises a plurality of compression rollers which are arranged one by one along a preset path from upstream to downstream, and a first rolling gap is formed between every two adjacent compression rollers along the preset path; the first pressing roller and the second pressing roller which are located on the upstream can roll powder located in a first rolling gap formed by the first pressing roller and the second pressing roller into a powder film, and the powder film is conveyed to the downstream under the rotation action of the pressing rollers and sequentially penetrates through the subsequent first rolling gaps; the compression roller positioned between the upstream compression roller and the downstream compression roller is a middle roller; at least one middle roller is correspondingly provided with the supporting rollers; the supporting rollers are used for supporting the corresponding middle rollers so as to counteract the friction force, borne by the middle rollers, of the powder film. The support roller can reduce the risk of displacement or deformation of the middle roller when the powder or the powder film is rolled, so that the stability of the first rolling gap is ensured, the film forming thickness and the compaction density are ensured, and the quality stability of a finished product prepared by a dry method can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing equipment, in particular to a dry electrode preparation device. Background Art

[0002] Battery electrode processing technology can be divided into wet process and dry process according to whether solvent is used. In the dry process, the positive or negative electrode powder of the battery is directly pressed into a self-supporting powder film and pressed onto the current collector to form a dry electrode without solvent.

[0003] The dry electrode preparation device is usually equipped with multiple rollers along a preset path, and there is a rolling gap between each two adjacent rollers in the upstream and downstream. The powder passes through the rolling gap upstream to form a powder film with a certain thickness, and the powder film passes through the rolling gap downstream to be thinned to a specific thickness. Finally, the powder film with a specific thickness is rolled onto the current collector to form a dry electrode.

[0004] In the above arrangement, a rolling gap is formed between the middle roller and the two pressing rollers upstream and downstream. When the powder film is rolled in the two rolling gaps, the middle roller has a tendency to shift or deform under the friction of the powder films on both sides. When the middle roller is displaced or deformed, the rolling gap formed with the other pressing rollers will change, which will lead to instability in the film thickness and compaction density. Utility Model Content

[0005] Based on this, it is necessary to provide a dry electrode preparation device that can improve the above problem, in order to address the problem that the middle roller located in the middle of the dry electrode preparation device in traditional technology is easily displaced or deformed under the friction of the powder film, resulting in changes in the rolling gap, thereby causing instability in the film thickness and compaction density.

[0006] A dry electrode preparation device includes a rolling mechanism, wherein the rolling mechanism includes:

[0007] A plurality of pressing rollers are arranged one by one along a preset path from upstream to downstream, and the plurality of pressing rollers can rotate around their own axes respectively; a first roller pressing gap is formed between every two adjacent pressing rollers along the preset path, and the first and second pressing rollers located at the most upstream can press the powder located in the first roller pressing gap formed by the two rollers into a powder film, and the powder film is transported downstream under the rotation of the pressing rollers and passes through each of the subsequent first roller pressing gaps in sequence; the pressing roller between the pressing roller located at the most upstream and the pressing roller located at the most downstream is an intermediate roller;

[0008] A supporting roller is provided corresponding to at least one of the intermediate rollers; the supporting roller is used to support the intermediate roller corresponding thereto to offset the friction force of the powder film on the intermediate roller.

[0009] In the above dry electrode preparation device, at least one intermediate roller is provided with a support roller corresponding to the intermediate roller, and the support roller is used to support the intermediate roller to offset the friction force of the powder film on the intermediate roller. In this way, the risk of displacement or deformation of the intermediate roller when rolling the powder film is reduced, the stability of the first rolling gap is ensured, the film thickness and compaction density are guaranteed, and the quality stability of the finished product prepared by the dry method can be effectively improved.

[0010] In one embodiment, the linear speed of each of the pressing rollers gradually increases from upstream to downstream, and the axes of each of the pressing rollers are located in the same plane;

[0011] The support roller is supported in a radial direction of the intermediate roller perpendicular to the plane.

[0012] In one embodiment, from upstream to downstream, the outer diameters of the pressure rollers are equal, and the angular velocity gradually increases.

[0013] In one embodiment, from upstream to downstream, the linear speed ratio between each two adjacent pressing rollers is one of 1:1.4, 1:1.5, 1:2 and 1:3.

[0014] In one embodiment, the size of each of the first rolling gaps gradually decreases from upstream to downstream.

[0015] In one embodiment, the support roller can rotate along with the corresponding intermediate roller.

[0016] In one of the embodiments, the rolling mechanism further includes a support seat, and the support roller is rotatably mounted on the support seat via a bearing.

[0017] In one embodiment, the dry electrode preparation device further includes a feeding mechanism, and the number of the feeding mechanisms is equal to the number of the rolling mechanisms;

[0018] The feeding mechanism is used to provide powder to the first roller pressing gap between the first and second pressing rollers located most upstream.

[0019] In one embodiment, the dry electrode preparation device includes two rolling mechanisms, and a second rolling gap for the current collector to pass through is formed between the first rolling rollers located at the most downstream of the two rolling mechanisms; the two rolling rollers forming the second rolling gap transport the powder film formed by rolling of the corresponding rolling mechanisms to the second rolling gap, and respectively roll and compound it to the opposite side surfaces of the current collector.

[0020] In one embodiment, the dry electrode preparation device further comprises an unwinding mechanism, wherein the unwinding mechanism is used to unwind the current collector; and / or

[0021] The dry electrode preparation device also includes a winding mechanism, which is used to wind up the current collector compounded with the powder film. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A simplified structural diagram of a dry electrode preparation device provided in one embodiment of the present application;

[0023] Figure 2 for Figure 1 A linear velocity diagram of a partial structure of a rolling mechanism of a dry electrode preparation device shown in FIG.

[0024] Figure 3 For each roller Figure 2 Force analysis diagram of powder film and intermediate roller at the linear speed shown in .

[0025] Description of reference numerals:

[0026] 1000. Dry electrode preparation device; 100. Rolling mechanism; 10. Pressing roller; 11. Film-forming roller; 12. Intermediate roller; 13. Thinning roller; 20. First rolling gap; 30. Support roller; 200. Feeding mechanism; 300. Unwinding mechanism; 400. Winding mechanism; 500. Second rolling gap; 2000. Powder film; 3000. Current collector. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0033] See also Figure 1 In one embodiment of the present application, a dry electrode preparation device 1000 is provided, comprising a rolling mechanism 100, which is used to roll powder through multiple passes to form a powder film 2000 with a specific thickness. The prepared powder film 2000 can be rolled onto a current collector 3000 to prepare a dry electrode.

[0034] The rolling mechanism 100 includes a plurality of rollers 10, which are arranged one by one along a preset path from upstream to downstream, and a first rolling gap 20 is formed between each two adjacent rollers 10 on the preset path. Each roller 10 can rotate around its own axis, and the axes of each roller 10 are parallel to each other. The first roller 10 and the second roller 10 located at the most upstream can press the powder located in the first rolling gap 20 formed by the two into a powder film 2000. The powder film 2000 is transported downstream under the rotation of the rollers 10 and passes through each subsequent first rolling gap 20 in sequence, and finally forms a powder film 2000 with a specific thickness.

[0035] That is, the rolling mechanism 100 has n rollers 10, where n is a positive integer greater than or equal to 3. The n rollers 10 are arranged in sequence from upstream to downstream along a preset path according to the first roller 10, the second roller 10, ... the n-1 roller 10 and the n-th roller 10, and the n rollers 10 form a total of n-1 first rolling gaps 20. The first roller 10 and the second roller 10 at the most upstream are the first roller 10 and the second roller 10 formed by the arrangement from upstream to downstream. The powder enters the first rolling gap 20 between the first roller 10 and the second roller 10, and is pressed into a powder film 2000 by the first roller 10 and the second roller 10. The thickness of the powder film 2000 gradually decreases in the process of passing through the subsequent first rolling gaps 20, and finally the powder film 2000 reaches a specific thickness and surface density. It should be noted that the n rollers 10 may also be arranged in sequence along the preset path from downstream to upstream according to the first roller 10, the second roller 10, ...n-1 rollers 10 and n rollers 10. In this case, the first roller 10 at the most downstream is the nth roller 10 at the most upstream, the second roller 10 at the most downstream is the n-1th roller 10 at the most upstream, and so on.

[0036] In some specific implementations, please refer to Figure 1 The rolling mechanism 100 includes three rollers 10. At this time, from upstream to downstream, the powder enters the first roller gap 20 between the first roller 10 and the second roller 10, and is pressed into a powder film 2000 by the first roller 10 and the second roller 10. The powder film 2000 is thinned to a specific thickness through the first roller gap 20 formed by the second roller 10 and the third roller 10. Figure 1 For the rolling mechanism 100 on the left side, the direction from left to right is from upstream to downstream. Figure 1 For the rolling mechanism 100 on the right side, the direction from right to left is from upstream to downstream. It is conceivable that in other specific embodiments, the number of rollers 10 included in the rolling mechanism 100 is not limited, such as the rolling mechanism 100 can also include four, five or more than five rollers 10.

[0037] It should be noted that the preset path may be a straight path, in which case the axes of the rollers 10 are located in the same plane. It is conceivable that in other embodiments, the preset path may be a non-straight path, in which case the axes of the rollers 10 are not located in the same plane, as long as the powder film 2000 can pass through each first roller pressing gap 20 in sequence from upstream to downstream, and this is not limited here.

[0038] Further, the roller 10 between the roller 10 located most upstream and the roller 10 located most downstream is an intermediate roller 12. That is, on the preset path from upstream to downstream, the second roller 10 between the first roller 10 and the third roller 10 is an intermediate roller 12, the third roller 10 between the second roller 10 and the fourth roller 10 is also an intermediate roller 12, and the fourth roller 10 between the third roller 10 and the fifth roller 10 is also an intermediate roller 12. That is, on the preset path from upstream to downstream, the rollers 10 between the first roller 10 and the nth roller 10 are all intermediate rollers 12, and the number of intermediate rollers 12 is n-2. In a specific embodiment, the rolling mechanism 100 includes three rollers 10, and the rolling mechanism 100 has one intermediate roller 12.

[0039] For further information, see Figure 1 The rolling mechanism 100 further includes a support roller 30, and at least one intermediate roller 12 is provided with a support roller 30. The support roller 30 is used to support the intermediate roller 12 corresponding thereto to offset the friction force of the powder film 2000 on the intermediate roller 12, thereby reducing the risk of displacement or deformation of the intermediate roller 12. It should be noted that the arrangement position of the support roller 30 is related to the direction of the friction force of the powder film 2000 on the intermediate roller 12. It should also be noted that the friction force is the resultant force of the friction force applied to it by the powder film 2000 in the first rolling gap 20 on both sides of the intermediate roller 12. For example, in some specific embodiments, the friction force on the intermediate roller 12 is vertically upward, and at this time, the support roller 30 is supported above the intermediate roller 12 to apply a downward support force to the support roller 30, thereby offsetting the upward friction force.

[0040] In the dry electrode preparation device 1000 provided in the embodiment of the present application, at least one intermediate roller 12 is provided with a support roller 30, and the support roller 30 is used to support the intermediate roller 12 to offset the friction force of the powder film 2000 on the intermediate roller 12. In this way, the risk of displacement or deformation of the intermediate roller 12 when rolling the powder film 2000 is reduced, the stability of the first rolling gap 20 is ensured, the film thickness and compaction density are guaranteed, and the quality stability of the finished product prepared by the dry method can be effectively improved.

[0041] In some embodiments, the size of each first rolling gap 20 gradually decreases from upstream to downstream. In this way, the powder film 2000 can be gradually thinned to a set thickness after passing through each first rolling gap 20. Of course, in some other embodiments, the sizes of some first rolling gaps 20 can be set to be equal, while the sizes of some first rolling gaps 20 gradually decrease from upstream to downstream, which is not limited here.

[0042] Each intermediate roller 12 is provided with a corresponding support roller 30 to ensure the stability of each first roller pressing gap 20, thereby ensuring the film thickness and compaction density, and effectively improving the quality stability of the finished product prepared by the dry method. It should be understood that in some other embodiments, some intermediate rollers 12 may be provided with corresponding support rollers 30, such as providing an intermediate roller 12 that is subject to greater friction with a support roller 30, which is not limited here.

[0043] In some embodiments, the linear speed of each roller 10 increases gradually from upstream to downstream, and the axes of each roller 10 are located in the same plane. Each intermediate roller 12 is provided with a corresponding support roller 30, and the support roller 30 is supported in the radial direction of the corresponding intermediate roller 12 perpendicular to the above plane.

[0044] It should be noted here that the linear speed of each pressing roller 10 gradually increases from upstream to downstream, that is, each pressing roller 10 adopts a step-by-step differential speed design, which not only improves production efficiency, but also the step-by-step differential speed can apply shear force to the adhesion in the film-forming raw materials to promote film formation, and can also control the powder film 2000 to be transferred to the faster side.

[0045] In some specific embodiments, when the rolling mechanism 100 includes three rolling rollers 10, from upstream to downstream, they are respectively the first rolling roller 10 (film forming roller 11), the second rolling roller 10 (intermediate roller 12) and the third rolling roller 10 (thinning roller 13). Figure 2 The speed of the first roller 10 is v1, the speed of the second roller 10 is v2, and the speed of the third roller 10 is v3. When forming the powder film 2000, its speed is accelerated from v1 to v2, and then to v3. Figure 3, it can be concluded through speed analysis that the powder film 2000 between the first roller 10 and the second roller 10 is subjected to the friction resistance f1 from the first roller 10 in an upward direction, and the friction force f2 from the second roller 10 in a downward direction. The powder film 2000 between the second roller 10 and the third roller 10 is subjected to the friction resistance f3 from the second roller 10 in a downward direction, and the friction force f4 from the third roller 10 in an upward direction. Due to the relationship between the action force and the reaction force, the force analysis of the second roller 10 (middle roller 12) shows that the side of the second roller 10 close to the first roller 10 is subjected to the friction force F2=f2 of the powder film 2000 in an upward direction, and the side close to the third roller 10 is subjected to the friction force F3=f3 of the powder film 2000 in an upward direction. Therefore, due to the combined force of the above-mentioned friction forces, the middle roller 12 has a tendency to move upward or deform upward.

[0046] By arranging the support roller 30 in the radial direction perpendicular to the above plane with respect to the corresponding intermediate roller 12, as shown in FIG. Figure 1 As shown, the support roller 30 is arranged above the middle roller 12, which can offset the friction force of the powder film 2000 on the middle roller 12, thereby reducing the risk of the middle roller 12 shifting upward or deforming, ensuring the stability of the first roller pressing gap 20, ensuring the film thickness and compaction density, and effectively improving the quality stability of the finished product prepared by the dry method. Of course, in other embodiments, when the middle roller 12 is subjected to downward friction, the support roller 30 can also be arranged below the middle roller 12.

[0047] It is conceivable that in other embodiments, the axes of the pressure rollers 10 may not be located in the same plane, and the linear speeds of the pressure rollers 10 may also be set to be the same. In this case, the position of the support roller 30 is set according to the direction of the friction force exerted on the intermediate roller 12.

[0048] In some specific implementations, please refer to Figure 1 , from upstream to downstream, the outer diameters of the rollers 10 are equal, and the angular velocity gradually increases. Since the linear velocity is the product of the angular velocity and the radius, the outer diameters of the rollers 10 are equal, and when the angular velocity gradually increases, it can ensure that the linear velocity of the rollers 10 gradually increases. In other specific implementations, the angular velocities of the rollers 10 can also be set to be equal, and the outer diameters of the rollers 10 are set to gradually increase, so as to ensure that the linear velocity of the rollers 10 gradually increases.

[0049] In some embodiments, from upstream to downstream, the ratio of the linear speeds of each two adjacent rollers 10 is one of 1:1.4, 1:1.5, 1:2 and 1:3. For example, when the roller pressing mechanism 100 includes three rollers 10, from upstream to downstream, the ratio of the linear speed of the first roller 10 to the linear speed of the second roller 10 is 1.4, and the ratio of the linear speed of the second roller 10 to the linear speed of the third roller 10 is 1.4. It is conceivable that in other embodiments, the ratio of the linear speeds of the rollers 10 is not limited.

[0050] In some embodiments, the support roller 30 can rotate along with the corresponding intermediate roller 12. In this way, the friction between the support roller 30 and the intermediate roller 12 is rolling friction, which reduces the friction damage of the support roller 30 to the outer peripheral surface of the intermediate roller 12.

[0051] Furthermore, the rolling mechanism 100 further includes a support seat, and the support roller 30 is rotatably mounted on the support seat via a bearing, so that the support roller 30 can rotate relative to the support seat following the rotation of the intermediate roller 12 .

[0052] Continue reading Figure 1 The dry electrode preparation device 1000 further includes a feeding mechanism 200, and the number of the feeding mechanism 200 is equal to the number of the rolling mechanism 100. The feeding mechanism 200 is used to provide powder to the first rolling gap 20 between the first and second rolling rollers 10 located at the most upstream. Figure 1 As shown, the feeding mechanism 200 is located directly above the first roller pressing gap 20 between the first and second rollers 10 located at the most upstream, and the powder can enter the first roller pressing gap 20 through the feeding mechanism 200 under the action of gravity. Specifically, the feeding mechanism 200 can make the powder fall evenly to ensure the continuity and flatness of the dry film forming. It can be imagined that in other embodiments, the position of the feeding mechanism 200 is not limited, as long as it can realize the function of providing powder to the first roller pressing gap 20 between the first and second rollers 10 located at the most upstream.

[0053] Furthermore, the dry electrode preparation device 1000 includes two rolling mechanisms 100, and a second rolling gap 500 for the current collector 3000 to pass through is formed between the first rolling rollers 10 located at the most downstream of the two rolling mechanisms 100. It should be noted that the first rolling roller 10 at the most downstream is the first rolling roller 10 formed by arranging from downstream to upstream, and is also the last rolling roller 10 formed by arranging from upstream to downstream.

[0054] The two rollers 10 forming the second rolling gap 500 transport the powder film 2000 formed by rolling of the corresponding rolling mechanism 100 to the second rolling gap 500, and roll and compound it to the opposite two side surfaces of the current collector 3000. Among them, each rolling mechanism 100 is correspondingly provided with a feeding mechanism 200. In this way, a dry electrode with a powder film 2000 on both sides can be prepared. Furthermore, the dry electrode preparation device 1000 has a central axis, and the two rolling mechanisms 100 and the two feeding mechanisms 200 are symmetrically arranged on both sides of the central axis.

[0055] It is understandable that in some other embodiments, the dry electrode preparation device 1000 may also only have one rolling mechanism 100 and one feeding mechanism 200, which is not limited here.

[0056] The dry electrode preparation device 1000 also includes an unwinding mechanism 300, which is used to unwind the current collector 3000 so that the current collector 3000 enters the second rolling gap 500. The dry electrode preparation device 1000 also includes a winding mechanism 400, which is used to wind up the current collector 3000 compounded with the powder film 2000, that is, the winding mechanism 400 is used to wind up the dry electrode formed. Among them, the current collector 3000 can choose aluminum foil (including but not limited to composite aluminum foil, aluminum foil with double-sided glue, etc.) or copper foil (including but not limited to composite copper foil, copper foil with double-sided glue, etc.), the unwinding mechanism 300 unwinds at a uniform linear speed, and the winding mechanism 400 winds at a uniform linear speed. The unwinding mechanism 300 and the winding mechanism 400 each include a tension adjustment member to adjust the tension of the current collector 3000.

[0057] The powder film 2000 prepared by the dry electrode preparation device 1000 provided in the above embodiment is compared with the powder film 2000 prepared by the dry electrode preparation device 1000 provided in the comparative example.

[0058] Table 1 Powder and current collector 3000 process parameters

[0059]

[0060] Table 2 Related structural parameters

[0061]

[0062] Experimental process:

[0063] Comparative Example: The first roller pressing gap 20 between each roller 10 is accurately calibrated according to the roller spacing setting value to meet the setting requirements. A certain amount of powder is added through the feeding mechanism 200, and the powder is rolled into a film and composited onto the current collector 3000. The initial film thickness and the film thickness after thinning of the powder film 2000 are tested, and the roller spacing after the experiment is measured.

[0064] Embodiment: Compared with the comparative example, a support roller 30 is added, and the process is consistent with the comparative example, and the composition, process, and quality of the added powder are all consistent, and the equipment operation parameters are consistent. The initial film thickness and the film thickness after thinning of the powder film 2000 are tested, and the roller spacing after the experiment is measured.

[0065] Table 3 Summary of experimental results

[0066]

[0067] From the analysis of the above experimental results, it can be seen that in the comparative example, due to the effect of friction, the intermediate roller 12 is displaced or deformed upward, resulting in a greater increase in the spacing between the film-forming roller 11 and the intermediate roller 12, and the spacing between the intermediate roller 12 and the thinning roller 13, which in turn leads to an increase in the thickness of the powder film 2000. In the embodiment, the support roller 30 supports the intermediate roller 12 to ensure the stability of the intermediate roller 12. Under the same experimental conditions, the increase in the spacing between the film-forming roller 11 and the intermediate roller 12, and the spacing between the intermediate roller 12 and the thinning roller 13 are significantly reduced, and the initial film thickness and the film thickness after thinning are therefore thinner. In summary, the dry electrode preparation device 1000 provided in the embodiment of the present application has a significant improvement in the control of the roller spacing, which helps to improve the compaction density of the electrode powder film 2000.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0069] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A dry electrode preparation device, characterized in that: The invention comprises a rolling mechanism (100), wherein the rolling mechanism (100) comprises: A plurality of pressing rollers (10) are arranged one by one along a preset path from upstream to downstream, and the plurality of pressing rollers (10) are respectively capable of rotating around their own axes; a first rolling gap (20) is formed between every two adjacent pressing rollers (10) along the preset path; the first and second pressing rollers (10) located most upstream are capable of rolling powder located in the first rolling gap (20) formed by the two rollers into a powder film (2000); the powder film (2000) is transported downstream under the rotation of the pressing rollers (10) and passes through each subsequent first rolling gap (20) in sequence; the pressing roller (10) between the pressing roller (10) located most upstream and the pressing roller (10) located most downstream is an intermediate roller (12); A support roller (30), at least one of the intermediate rollers (12) is provided with the support roller (30) in correspondence; the support roller (30) is used to support the intermediate roller (12) corresponding thereto to offset the friction force of the powder film (2000) exerted on the intermediate roller (12).

2. The dry electrode preparation device according to claim 1, characterized in that: From upstream to downstream, the linear speed of each of the pressing rollers (10) gradually increases, and the axes of each of the pressing rollers (10) are located in the same plane; The support roller (30) is supported on the intermediate roller (12) in a radial direction perpendicular to the plane.

3. The dry electrode preparation device according to claim 2, characterized in that: From upstream to downstream, the outer diameters of the pressure rollers (10) are equal, and the angular velocity gradually increases.

4. The dry electrode preparation device according to claim 2, characterized in that: From upstream to downstream, the linear speed ratio between each two adjacent pressing rollers (10) is one of 1:1.4, 1:1.5, 1:2 and 1:

3.

5. The dry electrode preparation device according to claim 1, characterized in that: From upstream to downstream, the size of each of the first rolling gaps (20) gradually decreases.

6. The dry electrode preparation device according to claim 1, characterized in that: The support roller (30) is capable of rotating in accordance with the rotation of the corresponding intermediate roller (12).

7. The dry electrode preparation device according to claim 6, characterized in that: The rolling mechanism (100) further comprises a support seat, and the support roller (30) is rotatably mounted on the support seat via a bearing.

8. The dry electrode preparation device according to claim 1, characterized in that: The dry electrode preparation device further comprises a feeding mechanism (200), and the number of the feeding mechanisms (200) is equal to the number of the rolling mechanisms (100); The feeding mechanism (200) is used to provide powder to the first roller pressing gap (20) between the first and second pressing rollers (10) located most upstream.

9. The dry electrode preparation device according to claim 1, characterized in that: The dry electrode preparation device comprises two rolling mechanisms (100), wherein a second rolling gap (500) for the current collector (3000) to pass through is formed between the first rolling rollers (10) located at the most downstream of the two rolling mechanisms (100); the two rolling rollers (10) forming the second rolling gap (500) transport the powder film (2000) formed by rolling of the corresponding rolling mechanism (100) to the second rolling gap (500), and roll and compound the powder film to the opposite side surfaces of the current collector (3000) respectively.

10. The dry electrode preparation device according to claim 9, characterized in that: The dry electrode preparation device further comprises an unwinding mechanism (300), wherein the unwinding mechanism (300) is used to unwind the current collector (3000); and / or The dry electrode preparation device further comprises a winding mechanism (400), wherein the winding mechanism (400) is used to wind up the current collector (3000) compounded with the powder film (2000).

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