Rolling device and battery production equipment

Abstract

The utility model discloses a rolling device and battery production equipment. The rolling device comprises a slurry coating mechanism, a belt storage mechanism and a compression roller mechanism, the slurry coating mechanism is used for coating the side edge of the polar plate with slurry; the belt storage mechanism is used for coating the slurry on the polar plate with a material belt; the compression roller mechanism is used for compressing the material belt and the slurry onto the pole plate, the compression roller mechanism is provided with a first part and a second part, the diameter of the first part is larger than that of the second part, the first part is used for compressing the slurry close to the middle of the pole plate, and the second part is used for compressing the slurry close to the edge of the pole plate. When the pole plate is pressed by the compression roller mechanism, the position, close to the middle, of the pole plate is subjected to larger extrusion force, and the position, close to the side edge, of the pole plate is subjected to smaller extrusion force, so that even if the pole plate is coated with redundant slurry, the slurry, a material belt and a pole piece are efficiently and tightly pressed under the action of the compression roller mechanism; and the problem of belt breakage in the rolling process is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of roller pressing devices, in particular to a roller pressing device and battery production equipment. Background Art

[0002] As a new energy source, lithium batteries are widely used in all aspects of life, mainly in the fields of digital, automotive power, aerospace, etc. The conventional process manufacturing process of lithium batteries includes: pulping, coating, rolling, tab forming, winding, shelling, welding, liquid injection, formation, electrical performance testing, coating, storage, etc. Among them, the common abnormality of the rolling process is cold pressing belt breakage, which is also the key direction of process optimization in the lithium battery industry. The current solutions for rolling belt breakage include: substrate material improvement, speed reduction production, edge cutting, etc. Among them, the improvement of substrate material supply, because the current manufacturing capacity and process level of suppliers cannot meet the development of lithium battery technology, the substrate material fluctuates greatly, resulting in a belt break frequency of more than 0.5 times / roll; speed reduction production will lead to reduced production capacity and increased costs; edge cutting will lead to the loss of pole pieces, resulting in a large amount of scrap and increased manufacturing costs. Utility Model Content

[0003] One purpose of the utility model is to provide a rolling device and battery production equipment, which aims to solve the technical problem of polar plate breakage.

[0004] In order to achieve the above-mentioned purpose, a solution provided by the utility model is: a rolling device, which includes a slurry coating mechanism, a belt storage mechanism and a pressing roller mechanism; the slurry coating mechanism is used to coat the slurry to the side of the pole plate; the belt storage mechanism is used to coat the slurry belt on the pole plate; the pressing roller mechanism is used to press the belt and the slurry onto the pole plate, and the pressing roller mechanism has a first part and a second part, the diameter of the first part is larger than the diameter of the second part, the first part is used to press the slurry located in the middle of the pole plate, and the second part is used to press the slurry located near the edge of the pole plate.

[0005] Optionally, the pressing roller mechanism includes a first pressing assembly, a second pressing assembly and a third pressing assembly arranged in sequence along the plate transmission direction, and at least one of the first pressing assembly, the second pressing assembly and the third pressing assembly has a first part and a second part.

[0006] Optionally, the first rolling assembly includes a transmission roller and a first pressure roller, the transmission roller is used to support the electrode plate, the first pressure roller and the transmission roller are opposite to each other, the first pressure roller has a first large end and a first small end connected, the diameter of the first large end is larger than the diameter of the first small end, the first large end is used to press the slurry located in the middle of the electrode plate, and the first small end is used to press the slurry located near the edge of the electrode plate.

[0007] Optionally, the second rolling assembly includes an intermediate roller and a second pressing roller, the intermediate roller is used to carry the electrode plate, the second pressing roller and the intermediate roller are opposite to each other, the second pressing roller has a second large end and a second small end connected, the diameter of the second large end is larger than the diameter of the second small end, the second large end is used to press the slurry located in the middle of the electrode plate, and the second small end is used to press the slurry located near the edge of the electrode plate; the third rolling assembly includes an edge roller and a third pressing roller, the edge roller is used to carry the electrode plate, the third pressing roller and the edge roller are opposite to each other, the third pressing roller has a third large end and a third small end connected, the diameter of the third large end is larger than the diameter of the third small end, the third large end is used to press the slurry located in the middle of the electrode plate, and the third small end is used to press the slurry located near the edge of the electrode plate.

[0008] Optionally, the width of the first large end is smaller than the width of the second large end, and the width of the second large end is smaller than the width of the third large end.

[0009] Optionally, the width of the first large end gradually decreases toward the first small end; and / or, the width of the second large end gradually decreases toward the second small end; and / or, the width of the third large end gradually decreases toward the third small end.

[0010] Optionally, the rolling device further comprises a collecting device, the width of the edge roller is greater than the width of the third pressing roller, and the collecting device is used to collect the slurry on the edge roller.

[0011] Optionally, the collecting device includes a scraper and a collecting trough, the edge roller is not in contact with the scraper in the area opposite to the third pressure roller, and the collecting trough is used to collect the slurry dropped from the edge roller.

[0012] Optionally, the pressure roller mechanism also includes a driving member, a first frame and a second frame, the driving member, the transmission roller, the middle roller, and the edge roller are respectively connected to the first frame, the second frame is connected to the output end of the driving member, and the first pressure roller, the second pressure roller, and the third pressure roller are respectively connected to the second frame.

[0013] Optionally, the rolling device further comprises a frame, and the slurry coating mechanism, the belt storage mechanism, and the pressing roller mechanism are respectively arranged on the frame.

[0014] To achieve the above object, the utility model provides a solution: a battery production equipment, the battery production equipment comprising: a winding device and any of the above rolling devices, the winding device is used to wind the pole plate produced on the rolling device.

[0015] The beneficial effects of the utility model are:

[0016] The first part is the roller mechanism located in the middle of the plate, and the second part is the roller mechanism located at the edge of the plate. The diameter of the first part is larger than that of the second part. In this way, after the plate is coated with slurry by the slurry coating mechanism and the strip is coated by the strip storage mechanism, when the plate is pressed by the roller mechanism, the middle of the plate is subjected to greater extrusion pressure, and the side of the plate is subjected to less extrusion pressure. Therefore, even if excess slurry is coated on the plate, the excess slurry will overflow to the side of the plate under the action of the roller mechanism and then be recovered, thereby achieving efficient and tight pressing of the slurry and the strip with the plate, greatly improving the edge reinforcement strength of the plate, and effectively preventing the problem of strip breakage during rolling. In addition, the method of directly pressing the strip with the edge of the plate ensures that the strip is accurately positioned and fully utilized, and the reinforcement effect is stable and reliable, which is better than the traditional method of simply coating the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 It is a front structural schematic diagram of a rolling device provided by an embodiment of the utility model;

[0019] Figure 2 It is a side structural schematic diagram of a slurry coating mechanism provided by an embodiment of the utility model;

[0020] Figure 3 It is a side structural schematic diagram of a first rolling assembly provided in an embodiment of the utility model;

[0021] Figure 4 It is a side structural schematic diagram of the second rolling assembly provided by an embodiment of the utility model;

[0022] Figure 5 It is a side structural schematic diagram of the third rolling assembly provided by the embodiment of the utility model.

[0023] Slurry coating mechanism 200, slurry tank 210, screw pump 220, coating head 230, connecting pipe 240, coating roller 250, belt storage mechanism 300, material roller 301, pressing roller mechanism 100, first rolling assembly 110, transmission roller 112, first pressing roller 114, first large end 116, first small end 118

[0024] The second rolling assembly 120, the middle roller 122, the second pressing roller 124, and the second large end 126

[0025] The second small end 128, the third rolling assembly 130, the edge roller 132, and the third pressing roller 134

[0026] The third large end 136 , the third small end 138 , the driving member 140 , the first frame 150 , the second frame 160 , the collecting device 400 , the scraper 410 , the collecting tank 420 , and the pole plate 1000 . DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figures 1 to 5 As shown, Figure 1 It is a front structural schematic diagram of the rolling device provided by the embodiment of the utility model. Figure 2 2 is a schematic diagram of the side structure of a slurry coating mechanism 200 provided in an embodiment of the utility model. Figure 3 1 is a schematic diagram of the side structure of the first rolling assembly 110 provided in an embodiment of the utility model. Figure 4 : is a side structural schematic diagram of the second rolling assembly 120 provided in an embodiment of the utility model, Figure 5 It is a side structural schematic diagram of the third rolling assembly 130 provided in an embodiment of the utility model.

[0029] The utility model embodiment provides a battery production equipment, which includes a winding device and a rolling device, the rolling device is used for rolling to produce a plate with slurry, and the winding device is used for winding the plate with slurry into a bare battery cell.

[0030] Specifically, the rolling device includes a slurry coating mechanism 200, a belt storage mechanism 300 and a roller pressing mechanism 100. The slurry coating mechanism 200 is used to coat the slurry to the side of the electrode plate, which can be one side in the width direction of the electrode plate, or two opposite sides in the width direction of the electrode plate. The belt storage mechanism 300 is used to coat the slurry strip on the electrode plate, and the strip is located on the side of the slurry away from the electrode plate. The roller pressing mechanism 100 is used to press the strip and the slurry onto the electrode plate. The roller pressing mechanism 100 has a first part and a second part. The diameter of the first part is greater than the diameter of the second part. The first part is used to press the slurry located in the middle of the electrode plate, and the second part is used to press the slurry located near the edge of the electrode plate.

[0031] In this embodiment, the roller mechanism 100 is located in the middle of the plate as the first part, and the roller mechanism 100 is located in the edge of the plate as the second part, and the diameter of the first part is greater than the diameter of the second part. In this way, after the plate is coated with slurry by the slurry coating mechanism 200 and the material strip is coated by the tape storage mechanism 300, when the plate is pressed by the roller mechanism 100, the middle of the plate is subjected to greater extrusion force, and the side of the plate is subjected to less extrusion force. Therefore, even if excess slurry is coated on the plate, under the action of the roller mechanism 100, the excess slurry will overflow to the side of the plate and be recovered, thereby achieving efficient and tight pressing of the slurry and the material strip with the plate, greatly improving the edge reinforcement strength of the plate, and effectively preventing the problem of broken strips during rolling. In addition, the method of directly pressing the material strip with the edge of the plate ensures that the material strip is accurately positioned and fully utilized, and the reinforcement effect is stable and reliable, which is better than the traditional method of simply coating slurry.

[0032] Optionally, the slurry coating mechanism 200, the belt storage mechanism 300 and the pressing roller mechanism 100 are respectively connected to a frame, which is not shown in the drawings, and the frame can be a frame structure composed of profiles or a base composed of cast iron. Of course, one or two of the slurry coating mechanism 200, the belt storage mechanism 300 and the pressing roller mechanism 100 can also be connected to the bracket.

[0033] The roller mechanism 100 includes a first roller assembly 110, a second roller assembly 120 and a third roller assembly 130 arranged in sequence along the transmission direction of the plate. The plate is rolled by the first roller assembly 110, the second roller assembly 120 and the third roller assembly 130 in sequence. Of course, a fourth roller assembly, a fifth roller assembly and the like may also be provided according to the required compaction strength. At least one of the first roller assembly 110, the second roller assembly 120 and the third roller assembly 130 has a first part and a second part. According to the requirements of the slurry compaction strength, different combinations of the first roller assembly 110, the second roller assembly 120 and the third roller assembly 130 may be provided. It can be understood that the more the first roller assembly 110, the second roller assembly 120 and the third roller assembly 130 have the first part and the second part, the greater the compaction density of the slurry on the plate. The first rolling assembly 110 of the present embodiment has a first portion and a second portion, the second rolling assembly 120 has a first portion and a second portion, and the third rolling assembly 130 has a first portion and a second portion.

[0034] In this embodiment, the first rolling assembly 110, the second rolling assembly 120 and the third rolling assembly 130 respectively have a first part and a second part, the diameter of the first part is larger than the diameter of the second part, and the first part is closer to the middle area of ​​the plate than the second part. In this way, the first rolling assembly 110, the second rolling assembly 120 and the third rolling assembly 130 can respectively squeeze the excess slurry to the edge of the plate until the excess slurry is squeezed out, that is, the compaction density of the slurry at the side of the plate is improved, and the utilization efficiency of the slurry is also improved.

[0035] Specifically, the first rolling assembly 110 includes a transmission roller 112 and a first pressure roller 114. The transmission roller 112 is used to carry the electrode plate. The first pressure roller 114 and the transmission roller 112 are opposite to each other. The transmission roller 112 is located below the electrode plate, and the first pressure roller 114 is located above the electrode plate. The first pressure roller 114 presses the electrode plate onto the transmission roller 112. The first pressure roller 114 has a first large end 116 and a first small end 118 connected to each other. The first large end 116 is the first part, and the first small end 118 is the second part. The diameter of the first large end 116 is larger than the diameter of the first small end 118. The first large end 116 is used to press the slurry located in the middle of the electrode plate, and the first small end 118 is used to press the slurry located near the edge of the electrode plate. The first large end 116 has a greater squeezing effect on the slurry during rotation than the first small end 118 . The first large end 116 can squeeze excess slurry to the first small end 118 , and the first small end 118 further flattens and compacts the slurry, thereby preventing the plate from breaking.

[0036] Furthermore, the second rolling assembly 120 includes an intermediate roller 122 and a second pressing roller 124, the intermediate roller 122 is used to support the electrode plate, the second pressing roller 124 is opposite to the intermediate roller 122, the second pressing roller 124 has a second large end 126 and a second small end 128 connected to each other, the second large end 126 is the first part, the second small end 128 is the second part, the diameter of the second large end 126 is larger than the diameter of the second small end 128, the second large end 126 is used to press the slurry located in the middle of the electrode plate, and the second small end 128 is used to press the slurry located near the edge of the electrode plate.

[0037] The third rolling assembly 130 includes an edge roller 132 and a third pressure roller 134. The edge roller 132 is used to support the electrode plate. The third pressure roller 134 is opposite to the edge roller 132. The third pressure roller 134 has a third large end 136 and a third small end 138 connected to each other. The third large end 136 is the first part, and the third small end 138 is the second part. The diameter of the third large end 136 is larger than the diameter of the third small end 138. The third large end 136 is used to press the slurry located in the middle of the electrode plate, and the third small end 138 is used to press the slurry located near the edge of the electrode plate.

[0038] In this embodiment, the ends of the first pressing roller 114, the second pressing roller 124, and the third pressing roller 134 close to the center of the electrode plate are provided with a first large end 116, a second large end 126, and a third large end 136, and the ends of the first pressing roller 114, the second pressing roller 124, and the third pressing roller 134 away from the center of the electrode plate are provided with a first small end 118, a second small end 128, and a third small end 138. The first pressing roller 114, the second pressing roller 124, and the third pressing roller 134 can respectively drive the first large end 116, the second large end 126, the third large end 136, the first small end 118, the second small end 128, and the third small end 138 to rotate during the rotation process. During the rotation process, the first large end 116 first squeezes the excess slurry toward the edge, and the first small end 118 compacts the excess slurry. Then, the second large end 126 squeezes the excess slurry toward the edge again, and the second small end 128 compacts the excess slurry again. Finally, the third large end 136 squeezes the excess slurry toward the edge again, and the third small end 138 compacts the excess slurry again. After three extrusion and compaction operations, the slurry on the plate is evenly flattened and compacted, further ensuring that the plate will not break.

[0039] In one embodiment, the width of the first large end 116 is smaller than the width of the second large end 126, and the width of the second large end 126 is smaller than the width of the third large end 136. When the electrode plate passes through the first pressing roller 114, it is squeezed by the first large end 116 with the smallest width, when the electrode plate passes through the second pressing roller 124, it is squeezed by the second large end 126 with the medium width, and when the electrode plate passes through the third pressing roller 134, it is squeezed by the third large end 136 with the largest width, so that the squeeze area of ​​the slurry on the electrode plate at the large diameter end gradually increases, and the slurry on the electrode plate is gradually squeezed out and compacted, achieving a step-by-step effect.

[0040] In another embodiment, the width of the first large end 116 gradually decreases in the direction toward the first small end 118, so that the step difference caused by the transition between the first large end 116 and the first small end 118 is minimized, and the squeezing effect on the slurry on the electrode plate gradually decreases to achieve a gradual transition effect.

[0041] In another embodiment, the width of the second large end 126 gradually decreases toward the second small end 128, so that the step difference caused by the transition between the second large end 126 and the second small end 128 is minimal, and the squeezing effect on the slurry on the electrode plate gradually decreases, thereby achieving a gradual transition effect.

[0042] In another embodiment, the width of the third large end 136 gradually decreases toward the third small end 138, so that the step difference caused by the transition between the third large end 136 and the third small end 138 is minimal, and the squeezing effect on the slurry on the electrode plate gradually decreases to achieve a gradual transition effect.

[0043] Furthermore, the rolling device further includes a collecting device 400. The width of the edge roller 132 is greater than the width of the third pressing roller 134. The collecting device 400 is used to collect the slurry on the edge roller 132. In this embodiment, the slurry falling from the electrode plate can fall on the edge roller 132, and the edge roller 132 can rely on inertia to throw the slurry into the collecting device 400 during the rotation process, so that the overflowed slurry is collected, thereby improving the utilization efficiency of the slurry.

[0044] Specifically, the collecting device 400 includes a scraper 410 and a collecting trough 420. The area of ​​the edge roller 132 that is not opposite to the third pressure roller 134 is in contact with the scraper 410. The collecting trough 420 is used to collect the slurry dropped from the edge roller 132. Since the slurry is highly viscous, the slurry will partially adhere to the edge roller 132. Under the action of the scraper 410, the scraper 410 can scrape off all the slurry on the edge roller 132, thereby further improving the utilization efficiency of the slurry.

[0045] The roller mechanism 100 further includes a driving member 140, a first frame 150 and a second frame 160. The driving member 140, the transmission roller 112, the middle roller 122 and the edge roller 132 are respectively connected to the first frame 150, the second frame 160 is connected to the output end of the driving member 140, and the first roller 114, the second roller 124 and the third roller 134 are respectively connected to the second frame 160. The driving member 140 can drive the second frame 160 to move toward the first frame 150, or drive the second frame 160 to move away from the first frame 150, thereby driving the first roller 114, the second roller 124 and the third roller 134 to move toward or away from the transmission roller 112, the middle roller 122 and the edge roller 132 at the same frequency. The driving member 140 can be a cylinder driving member 140 or a servo motor driving member 140.

[0046] The slurry coating mechanism 200 includes a slurry tank 210, a screw pump 220, a coating head 230, a connecting pipe 240 and a coating roller 250. The connecting pipe 240 connects the slurry tank 210, the screw pump 220 and the coating head 230 in sequence. The slurry tank 210 is used to store slurry. The screw pump 220 is used to input the slurry in the slurry tank 210 to the coating head 230 through the connecting pipe 240. The coating head 230 and the coating roller 250 are opposite to each other. The coating roller 250 is used to carry the electrode plate, and the coating head 230 is used to coat the slurry on the electrode plate.

[0047] The tape storage mechanism 300 includes a material roller 301 , on which a material tape is wound and bound, and the material tape can drive the material roller 301 to rotate.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0049] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0050] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their 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 addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0051] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A rolling device, characterized in that: include: A slurry coating mechanism, used for coating the slurry on the side of the plate; A tape storage mechanism, used for applying a tape to the slurry on the plate; as well as The pressing roller mechanism is used to press the material strip and slurry onto the electrode plate. The pressing roller mechanism has a first part and a second part. The diameter of the first part is larger than the diameter of the second part. The first part is used to press the slurry located in the middle of the electrode plate, and the second part is used to press the slurry located near the edge of the electrode plate.

2. The rolling device according to claim 1, characterized in that: The pressing roller mechanism includes a first pressing assembly, a second pressing assembly and a third pressing assembly which are arranged in sequence along the driving direction of the pole plate, and at least one of the first pressing assembly, the second pressing assembly and the third pressing assembly has the first part and the second part.

3. The rolling device according to claim 2, characterized in that: The first rolling assembly includes a transmission roller and a first pressure roller, the transmission roller is used to carry the electrode plate, the first pressure roller and the transmission roller are opposite to each other, the first pressure roller has a first large end and a first small end connected, the diameter of the first large end is larger than the diameter of the first small end, the first large end is used to press the slurry located in the middle of the electrode plate, and the first small end is used to press the slurry located near the edge of the electrode plate.

4. The rolling device according to claim 3, characterized in that: The second rolling assembly includes a middle roller and a second pressing roller, the middle roller is used to carry the electrode plate, the second pressing roller is opposite to the middle roller, the second pressing roller has a second large end and a second small end connected, the diameter of the second large end is larger than the diameter of the second small end, the second large end is used to press the slurry located in the middle of the electrode plate, and the second small end is used to press the slurry located on the edge of the electrode plate; The third rolling assembly includes an edge roller and a third pressing roller, the edge roller is used to carry the electrode plate, the third pressing roller is opposite to the edge roller, the third pressing roller has a third large end and a third small end connected, the diameter of the third large end is larger than the diameter of the third small end, the third large end is used to press the slurry located in the middle of the electrode plate, and the third small end is used to press the slurry located near the edge of the electrode plate.

5. The rolling device according to claim 4, characterized in that: The width of the first large end is smaller than the width of the second large end, and the width of the second large end is smaller than the width of the third large end.

6. The rolling device according to claim 4, characterized in that: The width of the first large end gradually decreases in the direction toward the first small end; and / or, the width of the second large end gradually decreases in the direction toward the second small end; and / or, the width of the third large end gradually decreases in the direction toward the third small end.

7. The rolling device according to claim 4, characterized in that: The rolling device further comprises a collecting device, the width of the edge roller is greater than the width of the third pressing roller, and the collecting device is used to collect the slurry on the edge roller.

8. The rolling device according to claim 7, characterized in that: The collecting device comprises a scraper and a collecting trough, the edge roller is not in contact with the scraper in the area opposite to the third pressure roller, and the collecting trough is used to collect the slurry dropped from the edge roller.

9. The rolling device according to claim 4, characterized in that: The pressure roller mechanism also includes a driving member, a first frame and a second frame. The driving member, the transmission roller, the middle roller and the edge roller are respectively connected to the first frame. The second frame is connected to the output end of the driving member. The first pressure roller, the second pressure roller and the third pressure roller are respectively connected to the second frame.

10. The rolling device according to claim 1, characterized in that: The rolling device also includes a frame, and the slurry coating mechanism, the belt storage mechanism, and the pressing roller mechanism are respectively arranged on the frame.

11. A battery production device, characterized in that: The battery production equipment comprises: a winding device and a rolling device as claimed in any one of claims 1 to 10, wherein the winding device is used for winding the electrode plate produced on the rolling device.

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