Rubbing machine assembly and rubbing head

Abstract

A kneader assembly configured to knead a portion of an electrode assembly of a cylindrical battery cell includes a first plate, a second plate rotatably coupled to the first plate, and a kneading head coupled to the first plate. The rubbing head includes a body including a conical portion having a first tapered portion, a collar connected to the body and including a second tapered portion, and an edge between the first tapered portion and the second tapered portion.

Description

Technical Field

[0001] This application relates generally to battery cells, and more particularly to battery cell flattening equipment for manufacturing wound battery cells. Background Technology

[0002] Batteries or battery cells are crucial in providing power to many everyday electrical devices. Cylindrical batteries with a wound arrangement are commonly used to power electrical devices. These battery types are often referred to as "wound" batteries. A wound cylindrical battery typically includes an anode and cathode wound together in a cylindrical shape, with small gaps between the concentric layers of the roll, and the anode and cathode housed within a battery casing with electrical terminals located at both ends of the casing. In tabless wound battery cells, conductive sheets (typically formed from uncoated portions of electrode foil) typically extend along the length of the cathode and / or anode. The conductive sheets of each concentric layer of the roll can be flattened (or otherwise formed) together with other conductive sheets of each concentric layer of the core at a flattening area, allowing them to form connection points for efficient electrical connection to the electrical terminals of the battery casing. Flattening machines are commonly used to flatten the concentric layers of wound battery cells together. Examples of kneading machines can be found in Chinese Patent Publication Nos. CN 107394248 and CN 209843873, the contents of which are incorporated herein by reference. Utility Model Content

[0003] In one aspect, a flattening machine assembly configured to flatten a portion of an electrode assembly of a cylindrical battery cell includes a first plate, a second plate rotatably coupled to the first plate, and a flattening head coupled to the first plate, wherein the flattening head includes a body, a collar, and an edge, the body including a conical portion having a first conical portion, a collar coupled to the body and including a second conical portion, and an edge located between the first and second conical portions.

[0004] On the other hand, a flattening head of a flattening machine assembly is provided, the flattening machine assembly being configured to flatten a portion of an electrode assembly of a cylindrical battery cell. The flattening head includes a body, a collar, and a cylindrical edge. The body defines a first end, a second end, and a longitudinal axis extending through the first and second ends. The body includes a conical portion located at the first end of the body and configured to engage a portion of a core. The conical portion includes a first conical portion located between the conical portion and the body, and a second portion located at the second end of the body and connected to the flattening machine assembly. The collar is connected to the body, wherein the collar is substantially cylindrical and includes a second conical portion located between the collar and the body. The cylindrical edge is located on the body between the first and second conical portions.

[0005] In another aspect, a flattening machine assembly configured to flatten a portion of an electrode assembly of a cylindrical battery cell includes a plate, a mounting pin, and a plurality of flattening heads. The mounting pin is configured to engage with the distal end of the battery cell. The plurality of flattening heads are located on the plate, wherein each of the plurality of flattening heads is circumferentially positioned around the battery cell, and wherein each of the plurality of flattening heads includes a tapered portion configured to engage with the distal end of the battery cell. Movement of the plate simultaneously moves the plurality of flattening heads relative to the battery cell, such that the tapered portion of each of the plurality of flattening heads moves to engage and disengage with the distal end of the battery cell.

[0006] Before explaining any embodiment in detail, it should be understood that the embodiment, in its application, is not limited to the details of the configuration and arrangement of the components set forth in the following description or shown in the accompanying drawings. The embodiment can be practiced or implemented in various ways. Moreover, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “including,” “comprising,” or “having,” and variations thereof, means to cover the items listed thereafter and their equivalents, as well as additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof, are used extensively and cover direct and indirect installation, connection, support, and linking.

[0007] Additionally, it should be understood that embodiments may include hardware, software, and electronic components or modules, which, for the purposes of discussion, may be shown and described as if most components were implemented solely in hardware. However, those skilled in the art will recognize from this detailed description that, in at least one embodiment, the electronic aspects may be implemented in software (e.g., stored on a non-transitory computer-readable medium) executed by one or more processing units, such as microprocessors and / or application-specific integrated circuits (“ASICs”). Therefore, it should be noted that the embodiments may be implemented using multiple hardware and software-based devices and multiple different structural components. For example, “server,” “computing device,” “controller,” “processor,” etc., described in the specification may include one or more processing units, one or more computer-readable medium modules, one or more input / output interfaces, and various connection means (e.g., system buses) for connecting components.

[0008] Relative terms used in conjunction with quantities or conditions, such as “about,” “approximately,” “substantially,” etc., will be understood by those skilled in the art to include the stated value and have a meaning defined by the context (e.g., the term includes at least the degree of error associated with measurement accuracy, tolerances associated with a particular value (e.g., manufacturing, assembly, usage tolerances, etc.)). These terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. For example, the statement “from about 2 to about 4” also discloses a range “from 2 to 4.” Relative terms may refer to a percentage added to or subtracted from the indicated value (e.g., 1%, 5%, 10%, or more).

[0009] It should be understood that although some of the accompanying drawings show hardware and software located within a particular device, these descriptions are for illustrative purposes only. Functions described herein as being performed by one component can be performed by multiple components in a distributed manner. Similarly, functions performed by multiple components can be combined and performed by a single component. In some embodiments, the components shown may be combined or divided into separate software, firmware, and / or hardware. For example, instead of being located within and performed by a single electronic processor, logic and processing can be distributed across multiple electronic processors. Regardless of how they are combined or divided, hardware and software components can reside on the same computing device or can be distributed among different computing devices connected via one or more networks or other suitable communication links. Similarly, components described as performing specific functions may also perform additional functions not described herein. For example, a device or structure "constructed" in a certain way is constructed at least in this manner, but may also be constructed in a manner not explicitly listed.

[0010] Other aspects of the embodiments will become apparent from consideration of the detailed description and accompanying drawings. Attached Figure Description

[0011] Figure 1 A flattening component of a battery cell flattening machine, according to one embodiment, is shown in contact with the electrode assembly of a battery cell during flattening.

[0012] Figure 2 Illustrations are shown according to some embodiments Figure 1 A three-dimensional view of the electrode assembly.

[0013] Figure 3 Illustrations are shown according to some embodiments Figure 1 A three-dimensional view of the kneading component.

[0014] Figure 4 Illustrations are shown according to some embodiments Figure 1 A three-dimensional view of the flattening head of the flattening component.

[0015] Figure 5A Illustrations based on some embodiments Figure 4 A magnified stereoscopic view of a portion of the flattened head.

[0016] Figure 5B Illustrations based on some embodiments Figure 4 An enlarged cross-sectional view of a portion of the flattened head.

[0017] Figure 5C Illustrations are shown according to some embodiments Figure 5A and Figure 5B A magnified cross-sectional view of the kneading component.

[0018] Figure 6A Illustrations are shown according to some embodiments Figure 1 A partially magnified cross-sectional view of the leveling assembly and electrode assembly during the leveling process.

[0019] Figure 6B Illustrations are shown according to some embodiments Figure 1 A magnified cross-sectional view of the leveling assembly and electrode assembly after the leveling process.

[0020] Figure 7 Illustrations are shown according to some embodiments Figure 1 An enlarged cross-sectional view of the electrode assembly after the flattening process.

[0021] Figures 8A to 8E It shows the relationship with Figure 1 A partially magnified cross-sectional view of an alternative core used in conjunction with a flattening component. Detailed Implementation

[0022] Figure 1 A portion of a battery cell flattening machine 10 according to one embodiment is shown. The battery cell flattening machine 10 is operable to flatten coiled battery cells (…) at specific "flattening areas". Figure 2 The conductive strips of the concentric layers of the electrode assembly 14 are flattened or formed together. Thus, the battery cell flattener 10 forms a substantially flat connection surface and / or plane on the electrode assembly 14, which is effectively electrically connected to the electrical terminals of the battery housing of the electrode assembly 14. Conductive sheets (e.g., uncoated portions of electrode foil) may be uncoated portions of the corresponding anode and cathode sheets of the electrode assembly, as described in more detail below.

[0023] refer to Figure 2The electrode assembly 14 is formed by winding an anode sheet, a cathode sheet, and at least one separator sheet together. In some embodiments, an insulator sheet 18 may be disposed on the exterior of the electrode assembly 14. For example, the insulator sheet 18 may be formed from a separator sheet wound together with the anode sheet, cathode sheet, and separator sheet in the electrode assembly 14. In other embodiments, the insulator sheet 18 may be omitted. Uncoated portions 22 or foils of the electrode sheets (e.g., anode sheets and / or cathode sheets) are disposed at a first end 30 of the electrode assembly 14. A flattening process may be performed on the uncoated portions 22 to form a flattened region 26. In some examples, a second flattened region is disposed at a second end of the electrode assembly 14 and is formed similarly to the flattened region 26. The flattened region 26 allows the uncoated portions 22 of the electrode assembly 14 to be directly coupled to a welding plate at the first end 30 of the electrode assembly 14. The welding plate can then provide an electrical connection between the battery terminals and the electrodes of the electrode assembly 14.

[0024] Electrode assembly 14 may have a nominal voltage between approximately 1V and approximately 5V and a nominal capacity between approximately 1Ah and approximately 5Ah or greater (e.g., up to approximately 9Ah). Electrode assembly 14 may have any type of rechargeable chemistry, such as lithium (“Li”), lithium-ion (“Li-ion”), other lithium-based chemistry, nickel-cadmium (“NiCd”), nickel metal hydride (“NiMH”), etc.

[0025] refer to Figure 2 , Figure 6B and Figure 7 The first end 30 of the electrode assembly 14 (e.g., the flattened region 26) includes a chamfered edge 34 along the outer edge 28 of the electrode assembly 14. The chamfered edge 34 is formed during the flattening process described herein. In one embodiment, the chamfered edge 34 is formed via a flattening operation using a dedicated flattening head having one or more tapered portions, as described in more detail below. The flattening head may have modified folds for forming the chamfered edge 34 (e.g., the contact between the tapered portion of the flattening head and the collar). The flattening operation is applied at the first end 30 of the electrode assembly 14 to the uncoated portion of the electrode sheet (e.g., an anode or cathode sheet). The chamfered edge 34 may be formed to reduce or avoid formations or burrs (e.g., portions of the uncoated electrode portion that accumulate or aggregate during the flattening operation) formed during the flattening operation. Burrs may require additional rework to remove during manufacturing, thus reducing manufacturing efficiency. Burrs may also have dimensions sufficient to cause a potential short circuit between the uncoated portion of the electrode sheet and another component of the cell (e.g., a housing or container (not shown)).

[0026] In one embodiment, the chamfered edge 34 is formed by a first portion 38, a second portion 42 connected to the first portion 38, and an edge 46 connecting the first portion 38 and the second portion 42. For example... Figure 7 As shown, the first portion 38 may be oriented at a first angle A1 relative to the outer edge 28 of the electrode assembly 14 and at a second angle A2 relative to the edge 46. In one embodiment, the first angle A1 may be approximately 230°; however, values ​​greater than or less than 230° are also contemplated depending on the needs of a given application. The second angle A2 may be approximately 125°; however, values ​​greater than or less than 125° are also contemplated depending on the needs of a given application. The second portion 42 may be oriented at a third angle A3 relative to the edge 46 and at a fourth angle A4 relative to the first end 30. The third angle A3 may be approximately 215°; however, values ​​greater than or less than 215° are also contemplated depending on the needs of a given application. The fourth angle A4 may have an angle of 230°; however, values ​​greater than or less than 230° are also contemplated. The angles and distances described above are for illustrative purposes, and it is contemplated that other distances and / or angle values ​​may also be used depending on the needs of a given application.

[0027] In the illustrated embodiment, the first portion 38 and the second portion 42 are generally tapered relative to the outer edge 28 and the first end 30 of the electrode assembly 14. More specifically, in the illustrated embodiment, both the first portion 38 and the second portion 42 are tapered in the direction toward the first end 30 of the electrode assembly 14. However, in alternative embodiments, the first portion 38 and the second portion 42 may be tapered in opposite directions, or include alternative configurations (e.g., curved configurations, etc.). Furthermore, in the illustrated embodiment, the length of the second portion 42 is greater than the length of the first portion 38. In one example, the length of the second portion 42 may be approximately twice the length of the first portion 38. However, in other examples, the length of the second portion 42 may be greater than or less than twice the length of the first portion 38. In other embodiments, the first portion 38 and the second portion 42 may include alternative lengths or may be configured as a single portion. For example, Figure 8A An alternative configuration of electrode assembly 14 is shown, illustrated as electrode assembly 14a. More specifically, electrode assembly 14a includes a chamfered edge 34a having a single tapered portion 38a. The tapered portion 38a may be oriented at an angle A5 relative to the outer edge 28a. The value of angle A5 may be 200°. However, values ​​greater than 200° or less than 200° are also contemplated depending on the needs of a given application.

[0028] Figures 8B to 8D Alternative configurations of the electrode assembly 14 described above are shown, and are respectively shown as... Figures 8B to 8DElectrode assemblies 14b to 14d. More specifically, in Figures 8B to 8D In the electrode assemblies 14b, 14c, and 14d, the chamfered edges 34b, 34c, and 34d include first tapered portions 38b, 38c, and 38d positioned relative to each other at various angles, and second tapered portions 42b, 42c, and 42d. For example, in Figure 8B In this configuration, the first tapered portion 38b is oriented at a first angle A6 relative to the outer edge 28b, and the second tapered portion 42b may be oriented at a second angle A7 relative to the first portion 38b, but without an intermediate edge (e.g., edge 46) located therebetween. The value of the first angle A6 may be 190°; however, values ​​greater than or less than 190° are also conceivable depending on the needs of a given application. The value of the second angle A7 may be 205°; however, values ​​greater than or less than 205° are also conceivable depending on the needs of a given application.

[0029] In another example, such as Figure 8C As shown, the first tapered portion 38c is oriented substantially parallel to the second tapered portion 42c, and the edge 46c extends between the first tapered portion 38c and the second tapered portion 42c. The first tapered portion 38c may be oriented at a first angle A8 relative to the outer edge 28c. The first tapered portion 38c may also be oriented at a second angle A9 relative to the edge portion 46c. The second tapered portion 42c may be oriented at a third angle A10 relative to the edge portion 46c. As described above, the first tapered portion 38c and the second tapered portion 42c may be substantially parallel, such that the first angle A8 and the third angle A10 are equal. In one embodiment, the values ​​of the first angle A8 and the second angle A10 may be 225°; however, values ​​greater than or less than 225° are also contemplated depending on the needs of a given application. The value of the second angle A9 may be 135°; however, values ​​greater than or less than 135° are also contemplated depending on the needs of a given application. Figure 8C As shown, the length of the first conical portion 38c can be substantially equal to the length of the second conical portion 42c.

[0030] exist Figure 8D In the illustrated embodiment, the first tapered portion 38d is oriented at a first angle A11 relative to the outer edge 28d and at a second angle A12 relative to the edge portion 46d. The second tapered portion 42d may be oriented at a third angle A13 relative to the edge portion 46d. The value of the first angle A11 may be 225°; however, values ​​greater than or less than 225° are also contemplated. The value of the second angle A12 may be 135°; however, values ​​greater than or less than 135° are also contemplated. The value of the third angle A13 may be 205°; however, values ​​greater than or less than 205° are also contemplated. Figure 8D As shown, the length of the first portion 38d of the chamfered edge 34d is less than the length of the second tapered portion 42d.

[0031] Now go to Figure 8E The diagram illustrates an alternative configuration of the electrode assembly, shown as electrode assembly 14e. Specifically, the chamfered edge 34e of electrode assembly 14e includes a first tapered portion 38e, a second tapered portion 42e, and a third tapered portion 44e. The first tapered portion 38e may be oriented at a first angle A14 relative to the outer edge 28e. The second tapered portion 42e may be oriented at a second angle A15 relative to the first tapered portion 38e, and the third tapered portion 44e may be oriented at a third angle A16. The value of the first angle A14 may be 200°; however, values ​​greater than or less than 200° are also contemplated. The value of the second angle A15 may be 195°; however, values ​​greater than or less than 195° are also contemplated. The value of the third angle A16 may be 200°; however, values ​​greater than or less than 200° are also contemplated.

[0032] The above embodiments provide various configurations of the electrode assembly. These alternative embodiments can be implemented based on one or more characteristics of a given electrode, such as thickness, material type, cell size, etc.

[0033] The alternative embodiments described above are exemplary, and it should be understood that the electrode assembly may have various tapered portions formed thereon, resulting in a variety of numbers of tapered portions and various orientations of the tapered portions. As described above, the embodiments of the various chamfered portions described above are formed on the electrode assembly during the flattening process by a machine (e.g., battery cell flattening machine 10), as described in more detail below.

[0034] refer to Figure 1 and Figure 3 The battery cell flattening machine 10 includes a mounting support platform and a battery cell flattening or shaping assembly 50. The flattening assembly 50 includes a substrate 54, a rotating plate 58, a center pin 62, and a plurality of flattening head assemblies 66. The substrate 54 is generally cylindrical and includes a first surface 54a and a second surface 54b opposite to the first surface 54a. The first surface 54a includes a series of rectangular grooves 70. The grooves 70 extend from the distal edge of the substrate 54 toward the center point of the substrate 54, and their shape and size are configured to receive a portion of a flattening head assembly 66.

[0035] Continue to refer to Figure 1 and Figure 3The substrate 54 includes a central aperture 74 and a series of secondary apertures 78. The central aperture 74 extends through the substrate 54 along a central longitudinal axis 82. The central aperture 74 is generally circular and its shape and size are configured to receive a portion of a central pin 62. In some examples, the central pin 62 may be referred to as a mounting pin. The secondary apertures 78 are positioned adjacent to the central aperture 74. More specifically, the substrate 54 includes three secondary apertures 78, such that each of the secondary apertures 78 is equidistant from the central longitudinal axis 82. In some examples, the secondary apertures 78 are configured to ensure that one or more flattening head assemblies 66 are in place.

[0036] refer to Figure 1 and Figure 3 The rotating plate 58 is generally cylindrical and includes a first surface 58a and a second surface 58b opposite to the first surface 58a. The diameter of the rotating plate 58 is equal to the diameter of the substrate 54, and its thickness is less than the thickness of the substrate 54. The rotating plate 58 is coupled to the substrate 54 and can rotate relative to the substrate 54. More specifically, the substrate 54 and the rotating plate 58 are concentrically aligned such that the rotating plate 58 can rotate about a central longitudinal axis 82. The rotating plate 58 includes a central aperture 86 and various curved apertures 90. The central aperture 86 is generally circular, and its shape and size are configured to receive a central pin 62.

[0037] refer to Figure 1 and Figure 3 A center pin or mounting pin 62 extends through the substrate 54 and the rotating plate 58, and is configured to support the electrode assembly 14 and protrude into it. The shape and size of the center pin 62 are configured such that all or part of the center pin 62 protrudes through the center aperture 74 of the substrate 54 and the center aperture 86 of the rotating plate 58. More specifically, the center pin 62 may have a diameter corresponding to the diameter of the center aperture 74 of the substrate 54, thereby forming a tight fit between the center pin 62 and the rotating plate 58.

[0038] The distal end 94 of the center pin 62 is generally conical. Specifically, the distal end 94 is generally pointed and configured to support and protrude into the uncoated portion of the electrode sheet of the electrode assembly 14. An extension 98 is integrally formed with the distal end 94 of the center pin 62. The extension 98 can be configured to extend into the electrode assembly 14 to provide support for the electrode assembly 14 during a kneading operation. Therefore, the extension 98 can be secured to the center pin 62 by positioning the distal end 94 of the center pin 62 within the orifice of the extension 98. The extension 98 can be inserted into the center hole of the electrode assembly 14 and serves as additional support for the electrode assembly 14, allowing the electrode assembly 14 to be centrally positioned.

[0039] Continue to refer to Figure 1 and Figure 3 The flattening head assembly 66 may include a housing 102 and a flattening head 106. The housing 102 is generally rectangular and includes a body 114 and flanges 118 located on opposite sides of the body 114. The body 114 includes a circular through-hole shaped and sized to receive the flattening head 106.

[0040] Flanges 118 are generally rectangular and integrally formed with the sidewalls of body 114. The upper surface of each of the flanges 118 includes an elongated groove 122. The elongated groove 122 extends through the flange 118 and is shaped and sized to receive a pin or fastener.

[0041] refer to Figure 4 , Figure 5A and Figure 5B The flattening head 106 is generally cylindrical and includes a body 126, a flattened portion 130a adjacent to a first end 126a of the body 126, and a mounting portion 130b adjacent to a second end 126b opposite to the first end 126a of the body 126. The flattened portion 130a is configured to engage the electrode assembly 14, and more specifically, to engage uncoated portions of the anode and / or cathode of the electrode assembly 14. The flattened portion 130a includes a conical portion 134 and a first conical portion 138. The first conical portion 138, or conical edge, extends circumferentially between the base of the conical portion 134 and the collar 142 of the flattening head 106. The first conical portion 138 includes a first end 138a integrally formed with the distal end of the conical portion 134 and an opposing second end 138b. The first tapered portion 138 is tapered in the direction from the second end 126b of the main body 126 to the first end 126a of the main body 126, thereby forming an obtuse angle between the first tapered portion 138 and the conical portion 134.

[0042] The second end 126b of the main body 126 is generally cylindrical and positioned within a circular through-hole in the housing 102. More specifically, the second end 126b of the main body 126 is fixed to the housing 102 via a bearing and an end cap. (See reference) Figure 4 The flattening head 106 includes two flat portions 146 that are diametrically opposed. The flattening head 106 is driven to rotate by a rotating mechanism (not shown) to flatten the electrode assembly 14.

[0043] refer to Figure 4 , Figure 5A and Figure 5B A collar or wheel portion 142 is located on the kneading head 106, adjacent to the first end 126a of the body 126 of the kneading head 106. In the illustrated embodiment, the collar 142 is integrally formed with the body 126 of the kneading head 106. However, in an alternative embodiment, the collar 142 may be detachably connected to the kneading head 106. Figures 5A to 5B As shown, the collar 142 includes a first cylindrical portion 150 and a second cylindrical portion 154 integrally formed with the first cylindrical portion 150. The first cylindrical portion 150 is positioned adjacent to a first end 126a of the body 126 of the flattening head 106, and the second cylindrical portion 154 is located below the first cylindrical portion 150, between the first cylindrical portion 150 and a second end 126b of the body 126 of the flattening head 106. In the illustrated embodiment, the diameter of the second cylindrical portion 154 is larger than the diameter of the first cylindrical portion 150. However, in an alternative embodiment, the diameter of the first cylindrical portion 150 may be equal to or greater than the diameter of the second cylindrical portion 154.

[0044] refer to Figure 5A The first cylindrical portion 150 of the collar 142 circumferentially surrounds a portion of the flattening head 106. Therefore, a gap is formed between the upper surface 158 of the first cylindrical portion 150 and the distal end of the first tapered portion 138 of the flattening portion 130a. As shown in the illustrated embodiment, the outer edge 162 of the first cylindrical portion 150 of the collar 142 is generally rounded. However, in alternative embodiments, the outer edge 162 may include alternative configurations.

[0045] The upper surface 158 of the first cylindrical portion 150 is generally flat and includes a conical or cylindrical edge or portion 166 extending toward the first conical portion 138 of the flattening portion 130a. The second conical portion 166 includes a first end 166a integrally formed with the edge of the upper surface 158 of the first cylindrical portion 150 and an opposing second end 166b. The second conical portion 166 is tapered in the direction from the first end 126a of the body 126 of the flattening head 106 to the second end 126b of the body 126, thereby forming an obtuse angle between the second conical portion 166 and the upper surface 158 of the collar 142.

[0046] refer to Figures 5A to 5C A cylindrical edge 170 is formed at the junction between the second end 138b of the first tapered portion 138 of the flattening head 106 and the second end 166b of the second tapered portion 166 of the collar 142. The cylindrical edge 170 protrudes from the junction and extends cylindrically around the circumference of the flattening portion 130a. (See reference) Figure 5B The cylindrical edge 170 includes a triangular cross-section. However, in alternative embodiments, edge 170 may include alternative shapes and sizes. Now turn to Figure 5CThis is a 2D cross-sectional view of a portion of the flattened head 106, wherein a first tapered portion 138 forms a first angle A17 relative to a cylindrical edge 170, and a second tapered portion 166 forms a second angle A18 relative to the cylindrical edge 170. In one embodiment, the value of the first angle A17 may be 170°; however, values ​​greater than or less than 170° are also contemplated depending on the needs of a given application. The value of the second angle A18 may be 155°; however, values ​​greater than or less than 155° are also contemplated depending on the needs of a given application. The first tapered portion 138 may be oriented at a third angle A19 relative to the edge of the tapered portion 134. In one embodiment, the value of the third angle A19 may be 130°; however, values ​​greater than or less than 130° are also contemplated depending on the needs of a given application. In one embodiment, the first tapered portion 138, the second tapered portion 166, and the cylindrical edge 170 are configured to form corresponding tapered portions and edge portions on the chamfered portion of the electrode sheet, as described above regarding at least Figure 7 and Figures 8A to 8E As described above. Therefore, the positioning of the first tapered portion 138, the second tapered portion 166, and the cylindrical edge can be modified as needed to form the chamfered portion of the electrode assembly as described above. As mentioned above, these modifications can be made based on various characteristics of the electrode assembly and / or battery cell assembly, such as electrode assembly thickness, uncoated portion length, electrode assembly material type, battery cell size, or other appropriate parameters, to improve the flattening operation and reduce burrs or other deformations formed during the flattening operation.

[0047] In some embodiments, the first tapered portion 138 of the flattening portion 130a, the second tapered portion 166 of the collar 142, and the cylindrical edge 170 may be removed. More specifically, in this case, the distal end of the tapered portion 134 is directly connected to the collar 142 of the flattening head 106. Furthermore, in some embodiments, the first tapered portion 138 and the cylindrical edge 170 of the flattening portion 130a may be removed, such that only the second tapered portion 166 of the collar 142 extends between the tapered portion 134 and the collar 142. Additionally, in some embodiments, the second tapered portion 166 of the collar and the cylindrical edge 170 may be removed, such that only the first tapered portion 138 of the flattening portion 130a extends between the tapered portion 134 and the collar 142.

[0048] To position each of the flattening head assemblies 50 in the optimal position relative to the electrode assembly 14, the electrode assembly 14 is first positioned on the center pin 62. Specifically, the distal end 94 or extension 98 of the center pin 62 is inserted into or pressed against the center hole of the electrode assembly 14. To adjust the position of the flattening heads 106, the user can manually adjust the rotating plate 58 or adjust one of the housings 102. In some examples, the position of the flattening heads 106 can be adjusted automatically, for example by one or more automatic controller devices. The distal ends of the plurality of flattening heads 106 are arranged in the same imaginary plane to form a planar flattening surface on the electrode assembly 14. Movement of one of the housings 102 will cause the other housings 102 to move synchronously. In one embodiment, the user rotates the rotating plate 58 relative to the base plate 54. Rotation of the rotating plate 58 causes each of the flattening head assemblies 66 to translate relative to the electrode assembly 14. More specifically, when the rotating plate 58 rotates clockwise relative to the central longitudinal axis 82, the kneading head assembly 66 translates toward the electrode assembly 14, and when the rotating plate 58 rotates counterclockwise relative to the central longitudinal axis 82, the kneading head assembly 66 translates away from the electrode assembly 14.

[0049] As the flattening head assembly 66 translates toward the electrode assembly 14, a portion of the first end 30 of the uncoated portion of the electrode assembly 14 abuts against or comes into contact with one or more of the flattening heads 106. That is, a portion of the first end of the electrode assembly 14 comes into contact with the upper surface 158 of the collar 142 and the flattening portion 130a of the flattening head 106. (Reference) Figures 6A to 6B The first end 30 of the electrode assembly 14 is connected to the conical portion 134 of the flattening head 106, and the edge of the first end 30 of the electrode assembly 14 is connected to the first conical portion 138 of the flattening head 106, the second conical portion 166 of the collar 142, and the cylindrical edge 170 to form a chamfered edge 34. More specifically, the first conical portion 138 of the flattening head 106 is connected to the first end 30 of the electrode assembly to form a second portion 42, and the cylindrical edge 170 and the second conical portion 166 are connected to the first end 30 to form the first portion 38 of the chamfered edge.

[0050] refer to Figures 6A to 6BWhen the flattening head 106 and the electrode assembly 14 come into contact, for example during a flattening operation, the chamfered edge 34 advantageously allows for an increased contact angle with the flattening head 106. Furthermore, the chamfered edge 34 forming the electrode assembly 14 advantageously reduces burrs on the electrode assembly 14. More specifically, compared to conventional core flattening head configurations, the first tapered portion 138, the second tapered portion 166, and the cylindrical edge 170 of the flattening head 106 allow a larger surface area of ​​the electrode assembly 14 to contact a larger surface area of ​​the flattening head 106. The increased contact angle prevents the outer edge (e.g., aluminum foil) of the electrode assembly 14 from contacting or flattening the tapered portion 134 or the collar 142 of the flattening head 106, which could lead to burr formation because the acute angle between the collar 142 and the flattening head 106 causes uncoated portions to clump together. More specifically, the first tapered portion 138 of the flattening portion 130a, the second tapered portion 166 of the collar 142, and the cylindrical edge 170 allow for an increased contact angle A20 between the electrode assembly 14 and the upper surface 158 of the collar 142 of the flattening head 106. Typically, without the first tapered portion 138 of the flattening portion 130a, the second tapered portion 166 of the collar 142, and the cylindrical edge 170, the contact angle A20 between the electrode assembly 14 and the upper surface 158 of the collar 142 is 37°. However, in the illustrated embodiment, because the first tapered portion 138 of the flattening portion 130a, the second tapered portion 166 of the collar 142, and the cylindrical edge 170 allow for an increased angle, the contact angle A20 is approximately 45°. This increased contact angle A20 reduces the formation of burrs at the outer edge 28 of the first end 30 of the electrode assembly 14 due to contact with the flattening head 106.

[0051] Therefore, the embodiments described herein particularly provide a battery cell flattening machine for battery cells. Various features and advantages are set forth in the claims.

Claims

1. A calender assembly configured to calender a portion of an electrode assembly of a cylindrical battery cell, the calender assembly comprising: a first plate; a second plate rotatably coupled to the first plate; and a calender head coupled to the first plate, wherein the calender head comprises a body comprising a conical portion having a first tapered portion, a collar coupled to the body and comprising a second tapered portion, and a rim between the first tapered portion and the second tapered portion. The rim extends circumferentially around a circumference of the calender head.

2. The muller assembly of claim 1, wherein, The rim comprises a triangular cross-section.

3. The muller assembly of claim 1, wherein, The collar is substantially cylindrical and encircles a portion of the body.

4. The muller assembly of claim 1, wherein, The collar comprises an outer edge positioned adjacent the conical portion, and wherein the outer edge is generally rounded.

5. The muller assembly of claim 4, wherein, The collar comprises a first cylindrical portion and a second cylindrical portion integrally formed with the first cylindrical portion, and wherein the first cylindrical portion and the second cylindrical portion have different diameters.

6. The muller assembly of claim 4, wherein, The body of the calender head comprises two diametrically opposed flat portions.

7. The muller assembly of claim 1, wherein, 8. A calender head of a calender assembly configured to calender a portion of an electrode assembly of a cylindrical battery cell, the calender head comprising: a body defining a first end, a second end, and a longitudinal axis extending through the first end and the second end, the body comprising a conical portion on the first end of the body and configured to engage a portion of a jellyroll, the conical portion comprising a first tapered portion between the conical portion and the body, and a second portion on the second end of the body and coupled to the calender assembly; a collar coupled to the body, wherein the collar is substantially cylindrical and comprises a second tapered portion between the collar and the body; and a cylindrical rim on the body between the first tapered portion and the second tapered portion. The cylindrical rim extends circumferentially around a circumference of the calender head.

9. The flat end of claim 8, wherein, The cylindrical rim has a triangular cross-section.

10. The flat head as defined in claim 8, wherein, The first tapered portion tapers in a direction from the second end of the body to the first end of the body.

11. The flat head according to claim 8, wherein, The second tapered portion tapers in a direction from the first end of the body to the second end of the body.

12. The flat head according to claim 8, wherein, An obtuse angle is formed between the first tapered portion and the conical portion.

13. The flat head according to claim 8, wherein, An obtuse angle is formed between the second tapered portion and a surface of the collar.

14. The flat head according to claim 8, wherein, The body of the calender head comprises two diametrically opposed flat portions.

15. The flat head according to claim 8, wherein, The collar comprises an outer edge positioned adjacent the conical portion, wherein the outer edge is generally rounded.

16. The flat head according to claim 8, wherein, 17. A calender assembly configured to calender a portion of an electrode assembly of a cylindrical battery cell, the calender assembly comprising: a plate; a mounting pin configured to engage a distal end of the battery cell; ​ a plurality of kneading heads positioned on the plate, wherein each of the plurality of kneading heads is positioned circumferentially around the battery cell, wherein each of the plurality of kneading heads includes a tapered portion configured to engage a distal end of the battery cell; and wherein movement of the plate simultaneously moves the plurality of kneading heads relative to the battery cell such that the tapered portion of each of the plurality of kneading heads moves into and out of engagement with the distal end of the battery cell.

18. The malaxer assembly of claim 17, wherein, each of the plurality of kneading heads includes a body and a collar coupled to the body, the body including a conical portion.

19. The muller assembly of claim 17, wherein, the tapered portion of each of the plurality of kneading heads includes a first tapered portion tapered in the first direction and a second tapered portion tapered in a second direction opposite the first direction.

20. The kneading head assembly of claim 19, further comprising an edge positioned between the first tapered portion and the second tapered portion, wherein the edge extends circumferentially around the kneading head.

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