Via roller and battery cell winding equipment

Abstract

The utility model relates to the technical field of battery processing, and discloses a passing roller and battery cell winding equipment. Wherein the passing roller comprises a supporting roller body, the supporting roller body is provided with a first supporting area and a second supporting area, the first supporting area is used for supporting a pole piece and a pole lug, the side, away from the pole piece, of the pole lug is located in the second supporting area, and the ratio of the length of the pole lug located in the second supporting area to the length of the pole lug is not larger than 2 / 3; a negative pressure cavity is formed in the supporting roller body, a plurality of adsorption holes are formed in the second supporting area, and the adsorption holes are communicated with the negative pressure cavity so as to adsorb the tabs. The passing roller disclosed by the utility model can effectively solve the problem that the tabs are folded in the winding process of a battery cell, ensures the flatness of the tabs relative to pole pieces, and simultaneously reduces the condition that the tabs and the pole pieces are torn.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery processing technical field especially relates to a pass roller and electric core winding equipment. BACKGROUND

[0002] In the production process of the battery, the pole piece with the tab at one end is wound or laminated into an electric core. During the winding of the electric core, when the pole piece passes through the pass roller, the pole piece and the tab change from a flat state to an arc shape following the pass roller. At this time, the inner side of the tab is deformed by the pressure stress, and the outer side of the tab is deformed by the tensile stress. The tab will be stressed and deformed to be warped and folded. The tab may be wrinkled and folded, which affects the welding of the tab. In severe cases, the tab may be folded into the electric core, causing the electric core to be short-circuited, the internal resistance to be large, lithium to be separated, and even safety risks to be generated. In addition, the tab is also prone to tearing at the connection with the pole piece.

[0003] Therefore, there is an urgent need for a pass roller and an electric core winding equipment to solve the above problems. SUMMARY

[0004] Based on the above, the purpose of the utility model is to provide a pass roller and an electric core winding equipment, which can effectively solve the problem of tab folding during the winding of the electric core, ensure the flatness of the tab relative to the pole piece, and reduce the tearing between the tab and the pole piece.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The pass roller comprises:

[0007] The support roller body is provided with a first support area and a second support area. The first support area is used to support the pole piece and the tab. The tab is located on the second support area away from the side of the pole piece. The length of the tab located in the second support area is not greater than 2 / 3 of the length of the tab. The inside of the support roller body is provided with a negative pressure cavity. The second support area is provided with a plurality of adsorption holes. The adsorption holes are communicated with the negative pressure cavity to adsorb the tab.

[0008] The electric core winding equipment comprises at least one pass roller as described in any of the above solutions.

[0009] The utility model has the advantages of:

[0010] The supporting roller body can support the material belt. Specifically, the supporting roller body is provided with a first supporting area and a second supporting area along the length direction thereof, wherein the second supporting area is provided with suction holes, and the supporting roller body is provided with a negative pressure cavity, and the suction holes are communicated with the negative pressure cavity. When the material belt passes through the roller, the tab close to the supporting roller body is subjected to negative pressure adsorption. At the same time that the tab deformation is subjected to stress driving tab deformation, the tab can also cover and block the suction holes. At this time, the suction holes communicated with the negative pressure cavity also generate a certain adsorption force on the tab, thereby offsetting the radial stress of the tab generated by the coating roller, so that the tab can be attached to the surface of the second supporting area of the supporting roller body without producing adverse effects such as warping and folding. It is worth noting that the second supporting area only adsorbs the range of not more than 2 / 3 of the tab away from one end of the pole piece, that is, at least 1 / 3 of the length of the tab close to and on one side of the pole piece is supported by the first supporting area and is not subjected to vacuum adsorption. In this way, the tearing problem between the tab and the pole piece caused by the adsorption force when the tab is separated from the roller can be reduced, so that the wound battery is more reliable. In addition, compared with the way of forcibly limiting the tab deformation space by the smoothing plate to prevent tab folding, the adsorption and smoothing reduce the bumping of the tab, effectively reducing the tab damage, tearing and breakage and the like. In summary, the roller not only prevents tab folding, but also reduces tab tearing, damage and the like, reduces the risk of breakage, and improves production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and these drawings.

[0012] Figure 1 is a schematic view of the roller provided by the specific embodiment of the present application;

[0013] Figure 2 is a schematic view of the roller provided by the specific embodiment of the present application.

[0014] In the drawings:

[0015] 100, supporting shaft; 110, threaded segment; 111, through hole;

[0016] 200, roller body assembly; 210, supporting roller body; 211, first supporting area; 212, second supporting area; 2121, suction hole; 220, end cover;

[0017] 300, plugging piece; 310, notch. DETAILED DESCRIPTION

[0018] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and are not understood as limiting the present application.

[0019] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0020] Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0022] The technical solutions of the present application are further illustrated below by combining the drawings and through specific embodiments.

[0023] As Figure 1 and Figure 2As shown, the present embodiment provides a passing roller, which includes a supporting roller body 210, the supporting roller body 210 is provided with a first supporting area 211 and a second supporting area 212, the first supporting area 211 is used for supporting the pole piece and the tab, and the tab away from the pole piece side is located in the second supporting area 212, the length of the tab located in the second supporting area 212 is not more than 2 / 3 of the length of the tab; the inside of the supporting roller body 210 is provided with a negative pressure cavity, and the second supporting area 212 is provided with a plurality of adsorption holes 2121, the adsorption holes 2121 are communicated with the negative pressure cavity to adsorb the tab.

[0024] The supporting roller body 210 can support the material belt. Specifically, the supporting roller body 210 is provided with a first supporting area 211 and a second supporting area 212 along the length direction thereof, wherein the second supporting area 212 is provided with adsorption holes 2121, the inside of the supporting roller body 210 is provided with a negative pressure cavity, and the adsorption holes 2121 are communicated with the negative pressure cavity. When the material belt passes through the passing roller, the tab close to the supporting roller body 210 is adsorbed by the negative pressure, and at the same time that the tab coating roller deformation is driven by stress to deform the tab, the tab can also cover and block the adsorption holes 2121, at this time the adsorption holes 2121 communicated with the negative pressure cavity also generate a certain adsorption force on the tab, thereby offsetting the radial stress of the tab generated by the coating roller, so that the tab can be attached to the surface of the second supporting area 212 of the supporting roller body 210 without producing adverse effects such as lifting and folding. It is worth noting that the second supporting area 212 only adsorbs the tab within a range of not more than 2 / 3 of the length of the tab away from the pole piece, that is, at least 1 / 3 of the length of the tab close to the pole piece is supported by the first supporting area 211 without being adsorbed by the vacuum, so that the tearing problem between the tab and the pole piece caused by the adsorption force when the tab is separated from the passing roller can be reduced, so that the wound battery is more reliable. In addition, compared with the way of forcibly limiting the deformation space of the tab by the smoothing plate to prevent the tab from folding, the adsorption and smoothing reduces the bumping of the tab, effectively reducing the damage, tearing and breakage of the tab. In summary, the passing roller not only can prevent the tab from folding, but also can reduce the adverse effects such as tearing and damage of the tab, reduce the risk of breakage, and improve the production efficiency.

[0025] Specifically, the passing roller further includes a supporting shaft 100, the supporting roller body 210 is sleeved on the supporting shaft 100 and can rotate relative to the supporting shaft 100, and the supporting shaft 100 is used for supporting the roller body assembly 200; wherein the supporting roller body 210 of the roller body assembly 200 is rotationally arranged on the outside of the supporting shaft 100, so that when the material belt passes through the passing roller, the supporting roller body 210 can support the material belt and rotate with the movement of the material belt to ensure the smooth running of the material belt. In other embodiments, the supporting roller body 210 and the supporting shaft 100 can be fixedly arranged, and the supporting shaft 100 is rotationally arranged on the rack to realize the rotation of the supporting roller body 210 when the material belt passes through.

[0026] Further, the support shaft 100 is hollow, and the support shaft 100 is provided with a through hole 111 in communication with the negative pressure cavity, one end of the support shaft 100 is used for communication with the negative pressure device, and the negative pressure environment in the negative pressure cavity is manufactured to adsorb the tab. Optionally, the adsorption force can be adjusted by adjusting the parameters of the negative pressure device.

[0027] Preferably, the adsorption force of the second support area 212 close to one end of the first support area 211 is smaller than the adsorption force of the second support area 212 away from one end of the first support area 211. That is, the adsorption force of the end of the tab away from the tab is larger, and the adsorption force of the side close to the tab is smaller, which can ensure the reliability of the adsorption and flattening, and also helps to reduce the adsorption force of the side close to the tab, thereby reducing the tearing of the tab. Specifically, the adsorption force gradually increases in the direction away from the first support area 211, so as to avoid damage to the tab due to too large force difference at different positions of the tab.

[0028] In the embodiment, the diameter of the adsorption hole 2121 gradually increases in the direction away from the first support area 211, so as to realize the function of different adsorption holes 2121 having different adsorption forces. Alternatively, the density of the adsorption hole 2121 can also be set to gradually increase in the direction away from the first support area 211. Alternatively, the diameter of the adsorption hole 2121 and the density of the adsorption hole 2121 can also be changed at the same time, and those skilled in the art can set them according to actual needs, which are not limited here.

[0029] Further, the roller further comprises two end covers 220, and the two end covers 220 and the support roller body 210 form a roller body assembly 200. The two end covers 220 are respectively arranged at the axial two ends of the support roller body 210, so as to enclose the outer side of the support shaft 100 and the inner side of the support roller body 210 into the above-mentioned negative pressure cavity. Alternatively, the support roller body 210 is threadedly connected with the end cover 220, which is convenient to connect and has good sealing effect. Illustratively, the end cover 220 is rotationally connected with the support shaft 100 through a bearing. It is worth noting that the outer wall of the support roller body 210 is adapted to the maximum outer diameter of the end cover 220, so that the outer peripheral wall diameter of the roller body assembly 200 is the same, and the flatness of the outer periphery of the roller body assembly 200 is ensured.

[0030] As an optional solution of the passing roller, the blocking member 300 is fixedly arranged on the support shaft 100, and the blocking member 300 can block part of the adsorption holes 2121. It can be understood that the fixed arrangement means that the blocking member 300 does not have relative movement with respect to the support shaft 100 when the passing roller is used. The adsorption holes 2121 blocked by the blocking member 300 cannot realize adsorption of the tab, so that only the adsorption holes 2121 in the preset angle range of the second support area 212 with respect to the circumferential direction of the support shaft 100 can be used for adsorption of the tab. When the material belt passes through the passing roller, the contact angle of the material belt with the support roller body 210 is the same as the above-mentioned preset angle, so as to ensure that the tabs passing through the support roller body 210 can be adsorbed. At the same time, the part of the adsorption holes 2121 not in contact with the material belt is blocked by the blocking member 300, so as to avoid that foreign matters are adsorbed on the outside of the support roller body 210 due to the existence of the vacuum adsorption force.

[0031] Specifically, the blocking member 300 is arranged in the shape of a ring column, the ring column-shaped blocking member 300 is sleeved on the outside of the support shaft 100 and is arranged on the inside of the support roller body 210. The blocking member 300 is provided with a gap 310 extending in the axial direction thereof, the gap 310 can communicate the inner wall and the outer wall of the ring column-shaped blocking member 300, so as to communicate the negative pressure cavity and the adsorption holes 2121, and the corresponding central angle of the gap 310 is the same as the preset angle. In other embodiments, a groove can also be arranged on the outside of the blocking member 300, the groove communicates with the adsorption holes 2121 in the preset angle, and the inside of the blocking member 300 is further provided with a gas passage penetrating the groove, so as to communicate the groove and the negative pressure cavity.

[0032] Preferably, the position of the blocking member 300 along the circumferential direction of the support shaft 100 is adjustable, the adsorption holes 2121 in different regions of the second support area 212 with respect to the circumferential direction of the support shaft 100 are correspondingly blocked, so as to adapt to different contact angles of the material belt with the support roller body 210 when the passing roller is arranged at different positions.

[0033] Optionally, the support shaft 100 is provided with a threaded segment 110, and the blocking member 300 is threadedly connected with the threaded segment 110. The threaded adjustment is convenient and reliable. It is worth noting that when the position of the blocking member 300 along the circumferential direction of the support shaft 100 is adjusted by the thread, the blocking member 300 will move with respect to the axial direction of the support shaft 100. Therefore, the length of the blocking member 300 along the support shaft 100 is greater than the length of the second support area 212 along the support shaft 100, so as to ensure that the adsorption holes 2121 corresponding to the blocking member 300 can be effectively blocked.

[0034] In the embodiment, the through holes 111 are provided in plurality, and the plurality of through holes 111 are arranged on the threaded section 110 along the axial direction of the support shaft 100. In this way, when the plugging member 300 plugs the adsorption hole 2121, the through holes 111 for generating negative pressure can also be plugged, and at least one through hole 111 is in communication with the negative pressure cavity. At the same time, the un-plugged through hole 111 is arranged towards the adsorption hole 2121, improving the reliability of adsorption. In other embodiments, the through holes 111 can be arranged at different positions of the support shaft 100. Alternatively, the plugging member 300 can be arranged in sliding connection with the support shaft 100, so as to adjust the circumferential position of the plugging member 300 along the support shaft 100.

[0035] The embodiment also discloses a battery cell winding device, which comprises at least one over roller as described in any of the above solutions. The over roller effectively reduces the occurrence of the tab being buckled and folded when passing through the over roller in the process of the battery cell, and improves the reliability and safety of the battery cell.

[0036] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A roller, characterized in that The supporting roller body (210) is provided with a first supporting area (211) for supporting the pole piece and the lug, and a second supporting area (212) where the lug is located away from one side of the pole piece, and the ratio of the length of the lug located in the second supporting area (212) to the length of the lug is not greater than 2 / 3; the inside of the supporting roller body (210) is provided with a negative pressure cavity, and the second supporting area (212) is provided with a plurality of adsorption holes (2121) in communication with the negative pressure cavity to adsorb the lug. The adsorption force of the second supporting area (212) near one end of the first supporting area (211) is smaller than that of the second supporting area (212) away from the other end of the first supporting area (211); and the adsorption force gradually increases in the direction away from the first supporting area (211).

2. The roller according to claim 1, characterized in that In the direction away from the first supporting area (211), the diameter of the adsorption hole (2121) gradually increases.

3. The roller according to claim 2, characterized in that In the direction away from the first supporting area (211), the density of the adsorption hole (2121) gradually increases.

4. The roller according to claim 2, wherein The negative pressure cavity is provided with a blocking piece (300) which can block part of the adsorption holes (2121) so that the adsorption holes (2121) in the preset angle range of the second supporting area (212) are used to adsorb the lug.

5. The roller according to any one of claims 1 to 4, characterized in that The position of the blocking piece (300) along the circumference of the supporting roller body (210) is adjustable.

6. The roller according to claim 5, characterized in that The supporting roller further comprises a supporting shaft (100), the supporting roller body (210) is rotatably arranged on the supporting shaft (100), the blocking piece (300) is fixedly sleeved on the outside of the supporting shaft (100), the blocking piece (300) is provided with a notch (310) extending in the axial direction thereof, the notch (310) penetrates the inner wall and the outer wall of the blocking piece (300) to communicate the negative pressure cavity and the adsorption hole (2121), and the central angle corresponding to the notch (310) is the same as the preset angle.

7. The roller according to claim 5, wherein The supporting shaft (100) is provided with a threaded segment (110), and the blocking piece (300) is threadedly connected with the threaded segment (110).

8. The roller according to claim 7, characterized in that The supporting shaft (100) is hollow, and the circumference of the supporting shaft (100) is provided with a plurality of through holes (111) in communication with the negative pressure cavity, the through holes (111) are arranged on the threaded segment (110), at least one of the through holes (111) is in communication with the notch (310), and one end of the supporting shaft (100) is used to communicate with a negative pressure device.

9. The roller according to claim 8, characterized in that The supporting roller comprises at least one supporting roller as claimed in any one of claims 1-9.

10. A cell winding apparatus, characterized by, ​

Images