Battery pole piece embossing structure

Abstract

The utility model belongs to the technical field of battery manufacturing, and particularly relates to a battery pole piece embossing structure which comprises an embossing roller and a silica gel pad on the surface of the embossing roller, and at least two or more of a first spherical roller, a second spherical roller and a rectangular roller are distributed on the silica gel pad in a circumferential array at intervals. The first spherical roller and the second spherical roller are each composed of a plurality of roller balls which are evenly arranged in the longitudinal direction, the diameter of the roller balls of the first spherical roller is larger than that of the roller balls of the second spherical roller, and the diameter of the roller balls of the first spherical roller is larger than the width of the rectangular roller. The first spherical rollers, the second spherical rollers and the rectangular rollers are distributed on the knurling rollers in the circumferential direction at intervals in an array mode, the pole pieces are knurled before being wound, a certain gap is formed between the positive pole piece and the negative pole piece, deformation caused by thickness expansion of the pole pieces is relieved, meanwhile, knurling patterns are optimized, the infiltration effect of the pole pieces is improved, and lithium precipitation of the pole pieces at the corners is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to a battery electrode sheet embossing structure. Background Art

[0002] With the development of the new energy industry, the proportion of lithium batteries in the market is also increasing, especially in the fields of electric vehicles and energy storage. The common manufacturing processes of lithium-ion batteries are the stacking process and the winding process. The winding process is relatively mature, and in addition, the equipment cost is low and the automation degree is high. Most battery manufacturing enterprises use the winding process. However, after the battery produced by the winding process is injected with liquid and charged and discharged, the positive and negative electrode sheets rebound and expand, causing the electrode sheets inside the battery core to wrinkle and deform, thereby affecting the electrical performance and safety performance of the battery and severely reducing the service life of the battery.

[0003] A common solution to improve the problem of electrode sheet wrinkles is to adopt the electrode sheet embossing process. The electrode sheet embossing process is to emboss and thicken the electrode sheet before winding, forming raised points of different shapes on the surface of the electrode sheet to make the electrode sheet thicker, leaving sufficient rebound space for the other electrode sheet. After the battery is injected with liquid, formed, and capacitanced, the reserved space can reduce the stress between the positive and negative electrode sheets to achieve the purpose of improving the electrode sheet wrinkles. The electrode sheet obtained by the existing embossing technology still has the problem of insufficient rebound space, the stress between the positive and negative electrode sheets is still large, the effect of improving the electrode sheet wrinkles is not good, and there are still problems such as material dropping and tape breaking during the embossing process, and difficulty in winding the electrode sheet. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery electrode sheet embossing structure for the deficiencies of the existing technology. By embossing the electrode sheet before winding, a certain gap is formed between the positive and negative electrode sheets to relieve the deformation caused by the thickness expansion of the electrode sheet. At the same time, by optimizing the embossing pattern, the infiltration effect of the electrode sheet is improved, and lithium deposition at the corners of the electrode sheet is improved.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery electrode sheet embossing structure includes an embossing roller and a silica gel pad on its surface. At least two or more of a first spherical roller, a second spherical roller, and a rectangular roller are circumferentially and arrayedly spaced on the silica gel pad. The first spherical roller and the second spherical roller are each composed of a plurality of roller balls longitudinally arranged evenly. The roller ball diameter of the first spherical roller is larger than that of the second spherical roller, and the roller ball diameter of the first spherical roller is larger than the width of the rectangular roller.

[0007] Preferably, the first spherical rollers are provided on the silica gel pad, and the first spherical rollers are composed of a plurality of roller balls arranged longitudinally and uniformly; and at least one of the second spherical rollers and the rectangular rollers is provided on the silica gel pad, and the second spherical rollers are composed of a plurality of roller balls arranged longitudinally and uniformly.

[0008] Preferably, first small roller balls are provided on both the first spherical rollers and the second spherical rollers, and the first small roller balls on the first spherical rollers and the second spherical rollers are arranged in an annular array.

[0009] Preferably, the protruding height of the first small roller balls is 1 - 5 μm, the diameter of the first small roller balls is 5 - 100 μm, and the center distance between two adjacent first small roller balls is 1 - 5 mm.

[0010] Preferably, second small roller balls are provided on the rectangular rollers, and the second small roller balls on the rectangular rollers are arranged in a rectangular array.

[0011] Preferably, the protruding height of the second small roller balls is 1 - 5 μm, the diameter of the second small roller balls is 5 - 100 μm, and the center distance between two adjacent second small roller balls is 1 - 5 mm.

[0012] Preferably, the protruding height of the first spherical rollers is 10 μm - 2 mm, the diameter of a single roller ball is 0.5 - 10 μm, and the center distance between two adjacent roller balls is 5 - 10 mm.

[0013] Preferably, the protruding height of the second spherical rollers is 10 μm - 1 mm, the diameter of a single roller ball is 0.5 - 5 μm, and the center distance between two adjacent roller balls is 5 - 10 mm.

[0014] Preferably, the protruding height of the rectangular rollers is 5 - 10 μm, the width is 1 - 5 mm, and the length is 1 - 20 cm.

[0015] Preferably, the thickness of the silica gel pad is 0.5 - 5 mm.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: A battery pole piece embossing structure provided by the present utility model embosses the pole piece before winding by circumferentially and arrayedly and spacingly distributing first spherical rollers, second spherical rollers and rectangular rollers on the embossing roller, forms a certain gap between the positive and negative pole pieces, alleviates the deformation caused by the thickness expansion of the pole piece, and simultaneously optimizes the embossing pattern to improve the wetting effect of the pole piece and improve the lithium deposition at the corners of the pole piece. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present utility model.

[0018] Figure 2It is a schematic plan view of Embodiment 1 of the present utility model.

[0019] Figure 3 It is a schematic structural view of Embodiment 2 of the present utility model.

[0020] Figure 4 It is a schematic plan view of Embodiment 2 of the present utility model.

[0021] Figure 5 It is a schematic structural view of Embodiment 3 of the present utility model.

[0022] Figure 6 It is a schematic plan view of Embodiment 3 of the present utility model.

[0023] Reference numerals:

[0024] 1, embossing roller; 2, silicone pad; 3, first spherical roller; 4, second spherical roller; 5, rectangular roller; 6, first small roller ball; 7, second small roller ball. Detailed implementation manners

[0025] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] Embodiment 1

[0027] As Figure 1-2 shown, a battery electrode sheet embossing structure includes an embossing roller 1 and a silicone pad 2 on its surface. The first spherical roller 3 and the second spherical roller 4 are circumferentially and arrayed at intervals on the silicone pad 2. Both the first spherical roller 3 and the second spherical roller 4 are composed of a plurality of roller balls arranged longitudinally and uniformly. The roller ball diameter of the first spherical roller 3 is larger than that of the roller balls of the second spherical roller 4. By setting the first spherical roller 3 and the second spherical roller 4, before the electrode sheet is wound, the embossing roller 1 is used to emboss the electrode sheet, forming a certain gap between the positive and negative electrode sheets, relieving the deformation caused by the thickness expansion of the electrode sheet. At the same time, by optimizing the embossing pattern, the infiltration effect of the electrode sheet is improved, and lithium deposition at the corners of the electrode sheet is improved. Among them, the first spherical roller 3 is arranged in a one-way straight row with a plurality of roller balls with a larger diameter, and the second spherical roller 4 is arranged in a one-way straight row with a plurality of roller balls with a smaller diameter. The two are arranged alternately and distributed on the cylindrical surface of the embossing roller 1. When rolling, grooves arranged at intervals can be formed on the surface of the electrode sheet under the embossing roller 1, so as to increase the contact area of the electrode sheet with the electrolyte, improve the infiltration effect of the electrode sheet, and at the same time relieve the deformation caused by the thickness expansion of the electrode sheet and improve the lithium deposition problem at the corners of the electrode sheet.

[0028] Furthermore, first small roller balls 6 are provided on the first spherical roller 3 and the second spherical roller 4, and the first small roller balls 6 on the first spherical roller 3 and the second spherical roller 4 are arranged in a ring array. The first small roller balls 6 in a ring array are arranged on the protruding surface of each roller ball of the first spherical roller 3 and the second spherical roller 4, and the contact area between the electrode and the electrolyte is further increased after rolling.

[0029] Further, the protruding height of the first small roller ball 6 is 1-5 μm, the diameter of the first small roller ball 6 is 5-100 μm, and the center distance between two adjacent first small roller balls 6 is 1-5 mm. Specifically, the protruding height of the first small roller ball 6 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.; the diameter of the first small roller ball 6 is 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm, etc.; the center distance between two adjacent first small roller balls 6 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0030] Further, the protruding height of the first spherical roller 3 is 10μm-2mm, the diameter of a single roller ball is 0.5-10μm, and the center distance between two adjacent roller balls is 5-10mm. Specifically, the protruding height of the first spherical roller 3 is 10μm, 50μm, 100μm, 200μm, 0.5mm, 1mm and 2mm, etc.; the diameter of a single roller ball is 0.5μm, 1μm, 2μm, 3μm, 5μm, 8μm and 10μm, etc.; the center distance between two adjacent roller balls is 5mm, 6mm, 7mm, 8mm, 9mm and 10mm, etc.

[0031] Further, the protruding height of the second spherical roller 4 is 10μm-1mm, the diameter of a single roller ball is 0.5-5μm, and the center distance between two adjacent roller balls is 5-10mm. Specifically, the protruding height of the second spherical roller 4 is 10μm, 50μm, 100μm, 200μm, 0.5mm and 1mm, etc.; the diameter of a single roller ball is 0.5μm, 1μm, 2μm, 3μm, 4μm and 5μm, etc.; the center distance between two adjacent roller balls is 5mm, 6mm, 7mm, 8mm, 9mm and 10mm, etc.

[0032] Furthermore, the thickness of the silicone pad 2 is 0.5-5 mm. Specifically, the thickness of the silicone pad 2 is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm. The silicone pad 2 can be used to deeply roll the pole piece, and the pole piece is evenly stressed to prevent the pole piece from not being pressed due to the uneven surface of the roller.

[0033] Embodiment 2

[0034] like Figure 3-4As shown in the figure, a battery electrode sheet embossing structure includes an embossing roller 1 and a silica gel pad 2 on its surface. First spherical rollers 3 and rectangular rollers 5 are circumferentially and arrayed at intervals on the silica gel pad 2. The first spherical rollers 3 are composed of a plurality of roller balls longitudinally arranged uniformly. The diameter of the roller balls of the first spherical rollers 3 is larger than the width of the rectangular rollers 5. By setting the first spherical rollers 3 and the rectangular rollers 5, the embossing roller 1 is used to emboss the electrode sheet before winding, forming a certain gap between the positive and negative electrode sheets, relieving the deformation caused by the thickness expansion of the electrode sheet. At the same time, by optimizing the embossing pattern, the infiltration effect of the electrode sheet is improved, and lithium deposition at the corners of the electrode sheet is improved. Among them, the first spherical rollers 3 are arranged in a one-way straight row with a plurality of roller balls of larger diameter, and the rectangle is a long strip cube with a smaller width. The two are arranged alternately and distributed on the cylindrical surface of the embossing roller 1. When rolling, grooves arranged at intervals can be formed on the surface of the electrode sheet under the embossing roller 1, so as to increase the contact area of the electrode sheet with the electrolyte, improve the infiltration effect of the electrode sheet, and at the same time relieve the deformation caused by the thickness expansion of the electrode sheet and improve the lithium deposition problem at the corners of the electrode sheet.

[0035] Further, there are first small roller balls 6 on the first spherical rollers 3, and the first small roller balls 6 on the first spherical rollers 3 are arranged in an annular array. By arranging the annular array of first small roller balls 6 on the protruding surfaces of each roller ball of the first spherical rollers 3, the contact area between the electrode sheet and the electrolyte is further increased after rolling.

[0036] Further, the protruding height of the first small roller balls 6 is 1-5 μm, the diameter of the first small roller balls 6 is 5-100 μm, and the center distance between two adjacent first small roller balls 6 is 1-5 mm. Specifically, the protruding height of the first small roller balls 6 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.; the diameter of the first small roller balls 6 is 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm, etc.; the center distance between two adjacent first small roller balls 6 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0037] Further, there are second small roller balls 7 on the rectangular rollers 5, and the second small roller balls 7 on the rectangular rollers 5 are arranged in a rectangular array. By arranging the second small roller balls 7 in a rectangular array on the upper surface of the rectangular rollers 5, the contact area between the electrode sheet and the electrolyte is further increased after rolling.

[0038] Further, the protruding height of the second small roller balls 7 is 1-5 μm, the diameter of the second small roller balls 7 is 5-100 μm, and the center distance between two adjacent second small roller balls 7 is 1-5 mm. Specifically, the protruding height of the second small roller balls 7 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.; the diameter of the second small roller balls 7 is 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm, etc.; the center distance between two adjacent second small roller balls 7 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0039] Further, the protruding height of the first spherical roller 3 is 10μm-2mm, the diameter of a single roller ball is 0.5-10μm, and the center distance between two adjacent roller balls is 5-10mm. Specifically, the protruding height of the first spherical roller 3 is 10μm, 50μm, 100μm, 200μm, 0.5mm, 1mm and 2mm, etc.; the diameter of a single roller ball is 0.5μm, 1μm, 2μm, 3μm, 5μm, 8μm and 10μm, etc.; the center distance between two adjacent roller balls is 5mm, 6mm, 7mm, 8mm, 9mm and 10mm, etc.

[0040] Further, the rectangular roller 5 has a protruding height of 5-10 μm, a width of 1-5 mm, and a length of 1-20 cm. Specifically, the protruding height of the rectangular roller 5 is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, and 10 μm, etc.; the width of the rectangular roller 5 is 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm, etc.; the length of the rectangular roller 5 is 1 mm, 2 mm, 5 mm, 8 mm, 10 mm, 15 mm, and 20 mm, etc.

[0041] Furthermore, the thickness of the silicone pad 2 is 0.5-5 mm. Specifically, the thickness of the silicone pad 2 is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm. The silicone pad 2 can be used to deeply roll the pole piece, and the pole piece is evenly stressed to prevent the pole piece from not being pressed due to the uneven surface of the roller.

[0042] Embodiment 3

[0043] like Figure 5-6 As shown, a battery pole piece embossing structure includes an embossing roller 1 and a silicone pad 2 on the surface thereof, wherein the first spherical roller 3, the second spherical roller 4 and the rectangular roller 5 are arranged in a circumferential array at intervals on the silicone pad 2, and the first spherical roller 3 and the second spherical roller 4 are both composed of a plurality of roller balls evenly arranged in the longitudinal direction, and the roller ball diameter of the first spherical roller 3 is greater than the roller ball diameter of the second spherical roller 4, and the roller ball diameter of the first spherical roller 3 is greater than the width of the rectangular roller 5. By providing the first spherical roller 3, the second spherical roller 4 and the rectangular roller 5, the pole piece is embossed by the embossing roller 1 before winding, and a certain gap is formed between the positive and negative pole pieces, so as to alleviate the deformation caused by the expansion of the pole piece thickness, and at the same time, the pole piece infiltration effect is improved by optimizing the embossing pattern, and the lithium deposition of the pole piece at the corner is improved. The first spherical roller 3 is a plurality of roller balls with a larger diameter arranged in a straight line in one direction, while the second spherical roller 4 is a plurality of roller balls with a smaller diameter arranged in a straight line in one direction. The two are arranged alternately and distributed around the cylindrical surface of the embossing roller 1. When rolling, they can form spaced grooves on the surface of the pole piece below the embossing roller 1, thereby increasing the contact area of ​​the electrolyte with the pole piece and improving the wetting effect of the pole piece. At the same time, it can alleviate the deformation caused by the expansion of the pole piece thickness and improve the lithium deposition problem of the pole piece at the corner.

[0044] Furthermore, first small roller balls 6 are provided on both the first spherical roller 3 and the second spherical roller 4, and the first small roller balls 6 on the first spherical roller 3 and the second spherical roller 4 are both arranged in an annular array. The annular array of first small roller balls 6 is provided on the protruding surfaces of the respective roller balls of the first spherical roller 3 and the second spherical roller 4, which further increases the contact area between the pole piece and the electrolyte after rolling.

[0045] Furthermore, the protruding height of the first small roller ball 6 is 1 - 5 μm, the diameter of the first small roller ball 6 is 5 - 100 μm, and the center distance between two adjacent first small roller balls 6 is 1 - 5 mm. Specifically, the protruding height of the first small roller ball 6 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.; the diameter of the first small roller ball 6 is 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm, etc.; the center distance between two adjacent first small roller balls 6 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0046] Furthermore, second small roller balls 7 are provided on the rectangular roller 5, and the second small roller balls 7 on the rectangular roller 5 are arranged in a rectangular array. The second small roller balls 7 are arranged in a rectangular array on the upper surface of the rectangular roller 5, which further increases the contact area between the pole piece and the electrolyte after rolling.

[0047] Furthermore, the protruding height of the second small roller ball 7 is 1 - 5 μm, the diameter of the second small roller ball 7 is 5 - 100 μm, and the center distance between two adjacent second small roller balls 7 is 1 - 5 mm. Specifically, the protruding height of the second small roller ball 7 is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.; the diameter of the second small roller ball 7 is 5 μm, 10 μm, 20 μm, 50 μm, 75 μm, 100 μm, etc.; the center distance between two adjacent second small roller balls 7 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0048] Furthermore, the protruding height of the first spherical roller 3 is 10 μm - 2 mm, the diameter of a single roller ball is 0.5 - 10 μm, and the center distance between two adjacent roller balls is 5 - 10 mm. Specifically, the protruding height of the first spherical roller 3 is 10 μm, 50 μm, 100 μm, 200 μm, 0.5 mm, 1 mm, 2 mm, etc.; the diameter of a single roller ball is 0.5 μm, 1 μm, 2 μm, 3 μm, 5 μm, 8 μm, 10 μm, etc.; the center distance between two adjacent roller balls is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0049] Further, the protruding height of the second spherical roller 4 is 10 μm - 1 mm, the diameter of a single roller ball is 0.5 - 5 μm, and the center distance between two adjacent roller balls is 5 - 10 mm. Specifically, the protruding height of the second spherical roller 4 is 10 μm, 50 μm, 100 μm, 200 μm, 0.5 mm, 1 mm, etc.; the diameter of a single roller ball is 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.; the center distance between two adjacent roller balls is 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0050] Further, the protruding height of the rectangular roller 5 is 5 - 10 μm, the width is 1 - 5 mm, and the length is 1 - 20 cm. Specifically, the protruding height of the rectangular roller 5 is 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc.; the width of the rectangular roller 5 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.; the length of the rectangular roller 5 is 1 mm, 2 mm, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, etc.

[0051] Further, the thickness of the silicone pad 2 is 0.5 - 5 mm. Specifically, the thickness of the silicone pad 2 is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. Using the silicone pad 2 can perform deep rolling on the pole piece, and the pole piece is uniformly stressed, preventing the pole piece from not being pressed due to the uneven surface of the roller.

[0052] According to the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the above specific embodiments, and any obvious improvements, substitutions, or variations made by those skilled in the art based on the present utility model fall within the protection scope of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims

1. A battery pole piece embossing structure, characterized in that: It includes an embossing roller and a silicone pad on its surface, wherein at least two or more of a first spherical roller, a second spherical roller and a rectangular roller are distributed in a circumferential array at intervals on the silicone pad, the first spherical roller and the second spherical roller are both composed of a plurality of roller balls uniformly arranged longitudinally, the roller ball diameter of the first spherical roller is larger than the roller ball diameter of the second spherical roller, and the roller ball diameter of the first spherical roller is larger than the width of the rectangular roller.

2. The battery pole piece embossing structure according to claim 1, characterized in that: The first spherical roller is provided on the silicone pad, and the first spherical roller is composed of a plurality of roller balls evenly arranged in the longitudinal direction; At least one of the second spherical roller and the rectangular roller is disposed on the silicone pad, and the second spherical roller is composed of a plurality of roller balls uniformly arranged in the longitudinal direction.

3. The battery pole piece embossing structure according to claim 1, characterized in that: The first spherical roller and the second spherical roller are both provided with first small roller balls, and the first small roller balls on the first spherical roller and the second spherical roller are both arranged in a ring array.

4. The battery pole piece embossing structure according to claim 3, characterized in that: The protruding height of the first small roller ball is 1-5 μm, the diameter of the first small roller ball is 5-100 μm, and the center distance between two adjacent first small roller balls is 1-5 mm.

5. The battery pole piece embossing structure according to claim 1, characterized in that: The rectangular roller is provided with second small roller balls, and the second small roller balls on the rectangular roller are arranged in a rectangular array.

6. The battery pole piece embossing structure according to claim 5, characterized in that: The protruding height of the second small roller ball is 1-5 μm, the diameter of the second small roller ball is 5-100 μm, and the center distance between two adjacent second small roller balls is 1-5 mm.

7. The battery pole piece embossing structure according to claim 1, characterized in that: The protruding height of the first spherical roller is 10 μm-2 mm, the diameter of a single roller ball is 0.5-10 μm, and the distance between the centers of two adjacent roller balls is 5-10 mm.

8. The battery pole piece embossing structure according to claim 1, characterized in that: The protruding height of the second spherical roller is 10 μm-1 mm, the diameter of a single roller ball is 0.5-5 μm, and the distance between the centers of two adjacent roller balls is 5-10 mm.

9. The battery pole piece embossing structure according to claim 1, characterized in that: The rectangular roller has a protruding height of 5-10 μm, a width of 1-5 mm, and a length of 1-20 cm.

10. The battery pole piece embossing structure according to claim 1, characterized in that: The thickness of the silica gel pad is 0.5-5 mm.

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