Rubbing device and battery cell rubbing equipment

Abstract

The utility model discloses a kneading device and battery cell kneading equipment, the kneading device comprises: a kneading part, the side surface of which is used for fitting a tab layer on the end surface of a battery cell; the limiting head is connected with the first end of the rubbing part, and the limiting head extends in the first direction relative to the first end. According to the scheme, due to the fact that the limiting head extends in the first direction relative to the first end, and the first direction intersects with the axial direction of the first end, the limiting head can protrude in the first direction relative to the first end. When the battery cell is kneaded, the side face of the kneading part is attached to the tab layer on the end face of the battery cell, meanwhile, the limiting head is located in the center hole of the battery cell, and the tab layer can be prevented from extending to the center hole under the limitation of the protruding part on the limiting head, so that when the tab layer is kneaded, the tab layer can be prevented from shielding the center hole after extending; the diameter of the center hole is effectively limited, and the center hole is prevented from being blocked.

Description

Technical Field

[0001] The present application relates to the technical field of battery processing, and particularly relates to a flattening device and a core flattening equipment. Background Art

[0002] The core is the most important component of the battery. After the core is wound, its end is uneven, with flanging and many burrs. In order to facilitate subsequent welding of the current collector plate at the end of the core and improve the welding quality, it is necessary to flatten the tab layer on the end of the core through a flattening head.

[0003] In the related art, during the process of flattening the tab layer by the flattening head, there is a risk that the central hole of the core will be blocked. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a flattening device and a core flattening equipment, which can limit the aperture size of the central hole of the core.

[0005] To solve the above technical problems, in a first aspect, the present application proposes a flattening device for flattening the tabs of a core, including:

[0006] A flattening part, the side surface of the flattening part is used to fit with the tab layer on the end face of the core;

[0007] A limiting head, the limiting head is connected to the first end of the flattening part, and the limiting head extends along a first direction relative to the first end, wherein the first direction intersects with the axial direction of the first end.

[0008] In the technical solution of the embodiment of the present application, since the limiting head extends along the first direction relative to the first end, and the first direction intersects with the axial direction of the first end, in this way, the limiting head will protrude along the first direction relative to the first end. When flattening the core, the side surface of the flattening part fits with the tab layer on the end face of the core. At the same time, the limiting head is located in the central hole of the core. Since the limiting head protrudes along the first direction relative to the first end, at this time, under the limitation of the protruding part on the limiting head, it is possible to prevent the tab layer from extending to the central hole. Therefore, when flattening the tab layer, it is possible to prevent the tab layer from extending and blocking the central hole, effectively limiting the diameter of the central hole and preventing the central hole from being blocked.

[0009] In some embodiments, the surface of the limiting head in contact with the side wall of the central hole of the core is an arc surface. In this way, when the limiting head contacts the side wall of the central hole, it is possible to prevent the limiting head from damaging the side wall of the central hole.

[0010] In some embodiments, the flattening device further comprises a first transition section, which is arranged between the flattening part and the limit head, so as to make a smooth transition between the flattening part and the limit head. In this way, the structural mutation generated at the connection between the flattening part and the limit head can be reduced, and the stability of the connection between the flattening part and the limit head can be improved.

[0011] In some embodiments, the flattening device further comprises an extrusion portion, the extrusion portion is connected to the second end of the flattening portion, and the extrusion portion has an extrusion surface;

[0012] Under the condition that the side of the flattened portion is in contact with the end face of the cell tab layer, the extrusion surface is in contact with the periphery of the tab layer, wherein the diameter of the extrusion portion is greater than the diameter of the second end, and the diameter of the second end is greater than the diameter of the first end. In this way, since the extrusion surface is in contact with the periphery of the tab layer, when the tab layer is flattened, the tab layer can be prevented from expanding outward, thereby effectively limiting the outer diameter of the tab layer.

[0013] In some embodiments, the flattening device further comprises a second transition section, which is arranged between the flattening part and the extrusion part, so as to make a smooth transition between the flattening part and the extrusion part. In this way, the structural mutation generated at the connection between the flattening part and the extrusion part can be reduced, and the stability of the connection between the flattening part and the extrusion part can be improved.

[0014] In some embodiments, the flattening device further comprises a connecting shaft, and the connecting shaft is arranged on a side of the extrusion portion away from the flattening portion, so as to facilitate the connection between the flattening device and the driving member.

[0015] In some embodiments, a connecting hole is axially arranged at one end of the connecting shaft away from the extrusion portion. Since the connecting hole is arranged on the connecting shaft, when the flattening device needs to be connected to other components, it is only necessary to insert the other components into the corresponding connecting hole.

[0016] In some embodiments, the connecting shaft includes a first section and a second section that are coaxially connected, a diameter of the first section is greater than a diameter of the second section, and the first section is connected to the extrusion portion.

[0017] In some embodiments, the connecting shaft is provided with a keyway, so that a corresponding flat key can be placed in the keyway to improve the stability of the connection between the connecting shaft and the aperture on other components.

[0018] In some embodiments, the first direction is perpendicular to the axial direction of the first end.

[0019] In a second aspect, the present application provides a cell flattening device, including a driving member and a flattening device as described in any one of the embodiments of the present application;

[0020] The driving member is connected to the flattening device and is used to drive the flattening device to rotate.

[0021] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the flattening device according to some embodiments of the present application;

[0024] Figure 2 is Figure 1 a cross-sectional view of;

[0025] Figure 3 is a schematic diagram of the flattening device according to some embodiments of the present application placed on the tab layer;

[0026] Figure 4 is a schematic diagram of multiple flattening devices according to some embodiments of the present application placed together.

[0027] The reference numerals in the specific embodiments are as follows:

[0028] 10. Flattening device; 101. Connecting shaft; 1011. Connecting hole; 102. Flattening part; 103. Limiting head; 1031. Side wall; 104. First transition section; 105. Extrusion part; 1051. Extrusion surface; 106. Second transition section; 11. Tab layer; 111. Periphery; 12. Central hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will describe in detail the embodiments of the technical solution of the present application with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly and thus are only examples and cannot be used to limit the protection scope of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0032] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at every occurrence in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of this application, the term "and / or" is merely a description of the associated relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0034] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] Next, the present application will be described in detail.

[0038] Currently, the lithium battery industry is developing rapidly. In order to obtain a smaller internal resistance and better rate performance, the end-face welding technology has been widely adopted in lithium-ion batteries.

[0039] The battery cell is the most important component of the battery. After the battery cell is wound, its end is uneven, with flanging and many burrs. In order to facilitate the subsequent welding of the current collector plate at the end of the battery cell and improve the welding quality, it is necessary to flatten the tab layer on the end of the battery cell through a flattening head.

[0040] When the existing flattening head flattens the tab layer, the tab layer will be compressed. At this time, the overall thickness of the tab layer becomes thinner, and the tab layer extends. The extended tab layer will block the central hole on the battery cell.

[0041] In order to solve the problem that the central hole of the battery cell will be blocked during the process of flattening the tab layer on the end of the battery cell by the existing flattening device, an embodiment of the present application provides a flattening device, as Figure 1 and in combination with Figure 2 shown, the flattening device 10 includes a flattening part 102 and a limiting head 103. Among them, the side surface of the flattening part 102 is used to fit with the tab layer on the end surface of the battery cell. The limiting head 103 is connected to the first end of the flattening part 102, and the limiting head 103 extends along the first direction relative to the first end, where the first direction intersects with the axial direction of the first end.

[0042] Exemplarily, the flattening part 102 has a conical structure. Of course, the flattening part 102 can also be other structures, such as: a cylindrical structure, etc. In this embodiment, the case where the flattening part 102 has a conical structure is taken as an example for description.

[0043] The flattening part 102 can be made of ceramic material or other materials with relatively high hardness. Processing with hard ceramic materials can meet the hardness requirements for extrusion and flattening, and at the same time has insulation properties to improve safety.

[0044] The limiting head 103 can be in an inverted hook shape. Of course, it can be understood that the limiting head 103 can also be in a circular ring shape, and specifically can be determined according to the actual situation. The embodiments of this specification do not make limitations in this regard.

[0045] The material of the limiting head 103 can be the same as that of the flattening part 102, or can be different from that of the flattening part 102, and specifically can be determined according to the actual situation. The embodiments of this specification do not make limitations in this regard.

[0046] The tab layer is a dense thickness layer formed by squeezing tabs through a flattening roller.

[0047] The central hole of the battery cell refers to the hole formed at the center of the bare battery cell after the winding needle is pulled out from the cylindrical battery cell formed through the winding process.

[0048] In this embodiment, as Figure 1 shown, the first end of the flattening part 102 is its right end, that is, the end with a smaller diameter.

[0049] The limiting head 103 in this embodiment can be integrally formed with the flattening part 102, or can be connected to the right end of the flattening part 102 by bolts, and specifically can be determined according to the actual situation. The embodiments of this specification do not make limitations in this regard.

[0050] Refer to Figure 1 shown. In this embodiment, the axial direction of the first end is the straight line AB, the first direction is any straight line intersecting with the straight line AB, and the included angle between the straight line CD where the first direction is located and the straight line AB can be 75°, 80°, 90°, etc., and specifically can be determined according to the actual situation. The embodiments of this specification do not make limitations in this regard. For the convenience of description below, it is described by taking the straight line CD where the first direction is located perpendicular to the straight line AB as an example.

[0051] Refer to Figure 2 shown. Set the diameter of the right end of the flattening part 102 as d1, and the diameter of the limiting head 103 as d2. Among them, d2 is greater than d1. In this way, when the limiting head 103 is located in the central hole 12, the side wall 1031 of the limiting head 103 can block the tab layer 11, avoiding the tab layer 11 extending to the central hole 12.

[0052] During use, multiple flattening devices 10 can be arranged according to the structure in Figure 4 , where represents the diameter of the central hole 12. By adjusting the assembly positions between multiple flattening devices 10, the diameter of the central hole 12 is made greater than 3 mm.

[0053] During flattening, as Figure 3As shown, the side of the flattening part 102 is in contact with the tab layer 11 on the end face of the battery cell. At the same time, the limiting head 103 is located in the central hole 12 of the battery cell. By driving the flattening part 102 to rotate through an external motor, the flattening of the tab layer 11 can be achieved.

[0054] In the technical solution of the embodiment of the present application, since the limiting head 103 extends along the first direction relative to the first end, and the first direction intersects with the axial direction of the first end, in this way, the limiting head 103 will protrude along the first direction relative to the first end. When flattening the battery cell, the side of the flattening part 102 is in contact with the tab layer 11 on the end face of the battery cell. At the same time, the limiting head 103 is located in the central hole 12 of the battery cell. When flattening the tab layer 11, although the tab layer 11 can be thinned and extended, when the tab layer 11 extends to the edge of the central hole 12, the protruding side wall 1031 on the limiting head 103 can block the tab layer 11 from continuing to extend towards the central hole 12, so that the tab layer 11 cannot extend to the central hole 12. Therefore, when flattening the tab layer 11, it is possible to avoid the tab layer 11 covering the central hole 12 after extension, effectively limiting the diameter of the central hole 12 and preventing the central hole 12 from being blocked.

[0055] According to some embodiments of the present application, the surface of the limiting head 103 in contact with the side wall of the central hole is an arc surface. In this way, when the limiting head 103 is in contact with the side wall of the central hole, it can avoid damaging the side wall of the central hole by the limiting head 103.

[0056] According to some embodiments of the present application, as Figure 1 shown, the flattening device 10 further includes a first transition section 104. The first transition section 104 is arranged between the flattening part 102 and the limiting head 103 to enable a smooth transition between the flattening part 102 and the limiting head 103.

[0057] The first transition section 104 in this embodiment can be an arc section structure, etc., and can be specifically determined according to the actual situation. The embodiments of this specification do not make limitations in this regard.

[0058] In this embodiment, the flattening part 102, the first transition section 104, and the limiting head 103 can be integrally formed or connected together by welding, and can be specifically determined according to the actual situation. The embodiments of this specification do not make limitations in this regard.

[0059] In this embodiment, since the first transition section 104 is arranged between the flattening part 102 and the limiting head 103, in this way, the structural mutation generated at the connection between the flattening part 102 and the limiting head 103 can be reduced, and the connection stability between the flattening part 102 and the limiting head 103 is improved.

[0060] According to some embodiments of the present application, as Figure 1 or Figure 2As shown, the flattening device 10 further includes an extrusion part 105. The extrusion part 105 is connected to the second end of the flattening part 102. The extrusion part 105 has an extrusion surface 1051; the diameter of the extrusion part 105 is greater than the diameter of the second end, and the diameter of the second end is greater than the diameter of the first end.

[0061] In this embodiment, as Figure 1 shown, the second end of the flattening part 102 is its left end, that is, the end with a larger diameter.

[0062] The extrusion part 105 in this embodiment has a cylindrical structure. Of course, it can be understood that the extrusion part 105 can also be other structures, such as a prism, etc. Specifically, it can be determined according to the actual situation, and the embodiments of this specification do not limit this.

[0063] The extrusion part 105 in this embodiment can be made of ceramic material, or can be made of other materials with higher hardness. Processing with hard ceramic materials can meet the hardness requirements for extrusion and flattening, and at the same time has insulation properties, improving safety.

[0064] The extrusion part 105 and the flattening part 102 in this embodiment can be integrally formed, or can be connected together by welding. Specifically, it can be determined according to the actual situation, and the embodiments of this specification do not limit this.

[0065] In this embodiment, the diameter of the extrusion part 105 is greater than the diameter of the left end of the flattening part 102. In this way, as Figure 3 shown, when the side surface of the flattening part 102 is in contact with the tab layer 11 on the end face of the battery cell, the extrusion surface 1051 will be in contact with the periphery 111 of the tab layer 11. Therefore, when flattening the tab layer 11, under the restrictive action of the extrusion surface 1051, the periphery 111 of the tab layer 11 can be prevented from expanding outwards, thereby effectively limiting the outer diameter size of the tab layer 11.

[0066] According to some embodiments of the present application, the flattening device 10 further includes a second transition section 106. The second transition section 106 is arranged between the flattening part 102 and the extrusion part 105 to enable a smooth transition between the flattening part 102 and the extrusion part 105.

[0067] The second transition section 106 in this embodiment can be a chamfer structure, etc. Specifically, it can be determined according to the actual situation, and the embodiments of this specification do not limit this.

[0068] In this embodiment, the flattening part 102, the second transition section 106, and the extrusion part 105 can be integrally formed, or can be connected together by welding. Specifically, it can be determined according to the actual situation, and the embodiments of this specification do not limit this.

[0069] In this embodiment, since a second transition section 106 is provided between the flattening section 102 and the extrusion section 105, the structural mutation generated at the connection between the flattening section 102 and the extrusion section 105 can be reduced, and the connection stability between the flattening section 102 and the extrusion section 105 is improved.

[0070] According to some embodiments of the present application, as Figure 1 or Figure 2 shown, the flattening device 10 further includes a connecting shaft 101, and the connecting shaft 101 is provided on the side of the extrusion section 105 facing away from the flattening section 102.

[0071] The connecting shaft 101 and the extrusion section 105 in this embodiment can be integrally formed or connected together by welding, and can be specifically determined according to the actual situation, and the embodiments of this specification do not limit this.

[0072] In this embodiment, the connecting shaft 101 is provided on the left side of the extrusion section 105, so as to facilitate the connection of the whole flattening device 10 with the motor.

[0073] According to some embodiments of the present application, as Figure 2 shown, a connecting hole 1011 is axially provided at one end of the connecting shaft 101 away from the extrusion section 105. Since the connecting hole 1011 is provided on the connecting shaft 101, when it is necessary to connect the whole flattening device 10 with the motor, only the output shaft on the motor needs to be inserted into the corresponding connecting hole 1011.

[0074] According to some embodiments of the present application, the connecting shaft 101 includes a first section and a second section (not marked in the figure) connected coaxially, wherein the diameter of the first section is larger than that of the second section, and the first section is connected to the extrusion section 105. In this way, the whole connecting shaft 101 has a stepped structure, which is convenient for the connecting shaft 101 to be connected with the corresponding stepped shaft hole.

[0075] According to some embodiments of the present application, a key groove (not marked in the figure) is provided on the connecting shaft 101. In this way, a corresponding flat key can be placed in the key groove to improve the connection stability between the connecting shaft and other shaft holes.

[0076] According to some embodiments of the present application, the first direction is perpendicular to the axial direction of the first end.

[0077] Referring to Figure 1 shown, the first direction is the direction where the straight line CD is located, and the axial direction of the first end is the direction where the straight line AB is located. Since the straight line AB is perpendicular to the straight line CD, that is, the limiting head 103 is perpendicular to the first end of the flattening section 102. At this time, the included angles between the limiting head 103 and the first end are all equal. In this way, when the limiting head 103 is machined on the flattening section 102 by turning, only one machining angle needs to be set to machine the limiting head 103, which brings convenience to the machining.

[0078] The present application also provides a cell flattening device, including a driving member and a flattening device 10 according to any one of the embodiments of the present application; the driving member is connected to the flattening device 10 and is used to drive the flattening device 10 to rotate.

[0079] The driving member in this embodiment can be a stepper motor, which can be specifically determined according to actual situations, and the embodiments of this specification do not limit this.

[0080] For the specific structure of the flattening device 10 in this embodiment, refer to the above embodiments. Since all the technical solutions of the above embodiments are adopted in this cell flattening device, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flattening device for flattening a cell tab, characterized in that: include: A flattened portion (102), the side surface of the flattened portion (102) being used to fit with the tab layer on the end surface of the battery cell; A limit head (103), the limit head (103) being connected to the first end of the flattening portion (102), the limit head (103) and the flattening portion (102) being integrally formed, or the limit head (103) being connected to the flattening portion (102) by means of bolts; The limiting head (103) extends along a first direction relative to the first end, wherein the first direction intersects with the axial direction of the first end.

2. The flattening device according to claim 1, characterized in that: The side of the limiting head (103) in contact with the side wall of the central hole of the battery core is an arc surface.

3. The flattening device according to claim 1, characterized in that: The flattening device further comprises a first transition section (104), wherein the first transition section (104) is arranged between the flattening portion (102) and the limiting head (103), so as to achieve a smooth transition between the flattening portion (102) and the limiting head (103).

4. The flattening device according to claim 3, characterized in that: The flattening device further comprises an extrusion portion (105), wherein the extrusion portion (105) is connected to the second end of the flattening portion (102), and the extrusion portion (105) has an extrusion surface (1051); The diameter of the extrusion portion (105) is greater than the diameter of the second end, and the diameter of the second end is greater than the diameter of the first end.

5. The flattening device according to claim 4, characterized in that: The flattening device further comprises a second transition section (106), wherein the second transition section (106) is arranged between the flattening portion (102) and the extrusion portion (105), so as to achieve a smooth transition between the flattening portion (102) and the extrusion portion (105).

6. The flattening device according to claim 4, characterized in that: The flattening device further comprises a connecting shaft (101), wherein the connecting shaft (101) is arranged on a side of the extrusion portion (105) away from the flattening portion (102).

7. The flattening device according to claim 6, characterized in that: A connecting hole (1011) is axially arranged at one end of the connecting shaft (101) away from the extrusion portion (105).

8. The flattening device according to claim 6, characterized in that: The connecting shaft (101) comprises a first section and a second section which are coaxially connected, the diameter of the first section is larger than the diameter of the second section, and the first section is connected to the extrusion portion (105).

9. The flattening device according to any one of claims 6 to 8, characterized in that: The connecting shaft (101) is provided with a keyway.

10. The flattening device according to claim 1, characterized in that: The first direction is perpendicular to the axial direction of the first end.

11. A battery cell flattening device, characterized in that: It comprises a driving member and a flattening device as claimed in any one of claims 1 to 10; The driving member is connected to the flattening device and is used to drive the flattening device to rotate.

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