A cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell

Abstract

The present disclosure envisages a cylindrical cell (100). The cylindrical cell (100) comprises a cylindrical jelly roll (102), a first end (104), a second end (108), and an insulating tape (112). The electrode assembly is wound in a cylindrical jelly roll (102) configuration. The first end (104) of the cylindrical jelly roll (102) is connected to a cathode disc (106) to form a positive terminal. The second end (108) of the cylindrical jelly roll (102) is connected to an anode lid (110) to form a negative terminal. The insulating tape (112) wound around the first end (104) of the cylindrical jelly roll (102). The insulating tape (112) extends out of the jelly roll (102). The height of the insulating tape (112) is less than the height (H2) of a top end (402) of the cathode disc (106) and greater than the height (H1) of a circumferential tab of the cathode disc (106).

Description

A CYLINDRICAL CELL AND A METHOD FOR ASSEMBLING AN ELECTRODE ASSEMBLY FORMING THE CYLINDRICAL CELLFIELD

[0001] The present disclosure relates, in general, to the field of energy storage devices.

[0002] More particularly, embodiments of the present disclosure relate to a cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell.DEFINITIONS

[0003] As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicates otherwise.

[0004] The term “Cylindrical Jelly Roll” refers to a wound electrode assembly within a cylindrical cell, comprising alternating layers of cathode, separator, and anode materials.

[0005] The term “Cathode Disc” refers to a conductive metallic disc connected to a cathode terminal of the electrode assembly, forming a positive terminal of the cylindrical cell.

[0006] The term “Anode Lid” refers to a metallic cover connected to an anode terminal of the electrode assembly, forming a negative terminal of the cylindrical cell.

[0007] The term “Insulating Tape” refers to a polyamide-based adhesive tape applied around the top end of the cylindrical jelly roll to provide electrical insulation between the cathode disc and an electrode assembly cover.

[0008] The term “Retention Tapes” refers to adhesive tapes applied at specific positions around the cylindrical jelly roll to maintain its wound configuration during and after assembly.

[0009] The term “Electrode Assembly Cover” refers to a hollow cylindrical housing that encases the jelly roll and supports mechanical integrity, electrical insulation, and ease of handling during assembly.

[0010] The term “Rivet Positive Terminal” refers to a mechanical component configured to lock the cathode disc in place within the electrode assembly cover and establish an electrical connection with the external terminal.

[0011] The term “Cathode Insulator” refers to a washer-shaped insulator placed over the cathode disc to electrically isolate it from the outer casing or electrode assembly cover.

[0012] The term “Sealing Pin” refers to a central pin integrated with the anode lid to facilitate sealing of the cell and prevent ingress of external contaminants.

[0013] The term “Circumferential Tab” refers to a lateral extension from the cathode disc used to establish connection with external or internal components.

[0014] The above definitions are in addition to those expressed in the art.BACKGROUND

[0015] The background information herein below relates to the present disclosure but is not necessarily prior art.

[0016] Energy storage devices are widely used in various applications, including consumer electronics, electric vehicles, and renewable energy storage systems. A typical energy storage device comprises multiple cylindrical cells that are known for their high energy density, efficiency, and compact design. The cylindrical configuration of these cells, often referred to as a jelly roll, facilitates the winding of the electrode assembly, optimizing space and enhancing electrochemical performance.

[0017] In conventional cylindrical cells, the assembly includes a cathode and an anode, with terminals for electrical connections. The positive terminal is typically formed by a cathode disc connected to one end of the jelly roll, while the negative terminal is created through an anode lid attached to the opposite end. The design and construction of these components are critical to the overall performance, safety, and reliability of the battery.

[0018] One important aspect of cell design is the insulation between the positive and negative terminals during the assembly of the jelly roll in an outer casing to prevent shortcircuiting and enhance safety. Insulating materials are often employed to mitigate the risk of electrical contact between the terminals and other conductive elements. The effectiveness of these insulating measures can significantly influence the cell's operational stability and longevity.

[0019] However, existing insulation methods may not adequately address issues related to the physical dimensions and spatial arrangements of the cell components. Specifically, there is a need for an improved insulation technique that maintains effective separation between the terminals and the outer can during assembly while optimizing the compactness and manufacturability of the cylindrical cell.

[0020] Therefore, there is felt a need for a cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell, that alleviates the aforementioned drawbacks.OBJECTS

[0021] Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows.

[0022] It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.

[0023] The main object of the present disclosure is to provide a cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell.

[0024] Another object of the present disclosure is to provide a cylindrical cell that effectively prevents short circuits between the electrode assembly and the surrounding structure while improving the overall safety and efficiency of the cell.

[0025] Another object of the present disclosure is to provide a cylindrical cell that ensures optimal insulation of the electrode assembly, particularly between the cathode and anode terminals.

[0026] Another object of the present disclosure is to provide a cylindrical cell that simplifies the assembly process, enhancing manufacturing efficiency and minimizing material waste.

[0027] Another object of the present disclosure is to provide a cylindrical cell with improved durability, ensuring long-term performance in various environmental conditions.

[0028] Other objects and advantages of the present disclosure will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present disclosure.SUMMARY

[0029] This summary is provided to introduce concepts related to a cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell. The concepts are further described below in the following detailed description. This summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining or limiting the scope of the claimed subject matter.

[0030] The present disclosure envisages a cylindrical cell. The cylindrical cell includes an electrode assembly wound in a cylindrical jelly roll configuration, a first end of the cylindrical jelly roll connected to a cathode disc to form a positive terminal, and a second end of the cylindrical jelly roll connected to an anode lid to form a negative terminal. According to an embodiment, an insulating tape is wound around the first end of the cylindrical jelly roll, where the insulating tape extends out of the cylindrical jelly roll, and the height of the insulating tape is less than the height of the top end of the cathode disc and greater than the height of a circumferential tab of the cathode disc.

[0031] In an embodiment, the cylindrical cell further comprises at least two retention tapes wound around the cylindrical jelly roll at predetermined locations to secure the cylindrical jelly roll.

[0032] In an embodiment, the insulating tape has a thickness of less than or equal to the thickness of the retention tapes.

[0033] In an embodiment, the retention tapes are positioned at a lower section and a midsection of the cylindrical jelly roll to secure the cylindrical configuration.

[0034] In an embodiment, the projection of the insulating tape from the cylindrical jelly roll is between 1.5 mm and 2 mm.

[0035] In an embodiment, the insulating tape is formed from a polyamide material with the following properties:• a peel adhesion of more than or equal to 500 gf / in;• a tensile strength of more than or equal to 1200 kgf / cm2;• an elongation of more than or equal to 50 percent; and• a breakdown voltage of more than or equal to 5 kV.

[0036] In an embodiment, the insulating tape has an acrylic adhesive that is free from containing silicon (Si) or iron (Fe).

[0037] In an embodiment, the cylindrical cell comprises a cathode insulator positioned over the cathode disc. The cathode insulator has a circular washer shape.

[0038] In an embodiment, the cathode insulator is configured to electrically isolate the cathode disc from the surrounding structure, preventing short circuits and maintaining the electrical integrity of the cylindrical cell.

[0039] In an embodiment, the cylindrical cell further comprises an electrode assembly cover that houses the cylindrical jelly roll. The anode lid engages with a bottom end of the electrode assembly cover, and the cathode disc passes through a hole in a top surface of the electrode assembly cover.

[0040] In an embodiment, the electrode assembly cover is a hollow cylindrical member that provides a structural enclosure for the cylindrical jelly roll, preventing mechanical damage during operation.

[0041] In an embodiment, the cylindrical cell further comprises a rivet positive terminal configured to lock the cathode disc in position relative to the electrode assembly cover.

[0042] In an embodiment, the rivet positive terminal includes a locking mechanism that ensures a secure electrical connection between the cathode disc and the positive terminal of the cylindrical cell.

[0043] In an embodiment, the cylindrical cell further comprises a sealing pin positioned along the central axis of the anode lid to receive a closing pin for sealing the anode terminal.

[0044] The present disclosure further envisages a method of assembling an electrode assembly forming a cylindrical cell, comprising: winding an electrode assembly into a cylindrical jelly roll; connecting a first end of the cylindrical jelly roll to a cathode disc to form a positive terminal; connecting a second end of the cylindrical jelly roll to an anode lid to form a negative terminal; applying at least two retention tapes around the cylindrical jelly roll at predetermined locations to maintain its cylindrical configuration; winding an insulating tape around the first end of the cylindrical jelly roll, wherein the insulating tape extends out of the cylindrical jelly roll, and wherein the height of the insulating tape is less than the height of the top end of the cathode disc and greater than the height of a circumferential tab of the cathode disc; positioning a cathode insulator over the cathode disc; inserting the cylindrical jelly roll into a hollow electrode assembly cover;aligning the anode lid with a bottom end of the hollow electrode assembly cover and passing the central portion of the cathode disc through a hole in a top surface of the electrode assembly cover; and locking the cathode disc in place using a rivet positive terminal.BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING

[0045] A cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell, of the present disclosure, will now be described with the help of the accompanying drawing, in which:

[0046] Figure 1 illustrates an exploded view of a cylindrical cell, in accordance with an embodiment of the present disclosure;

[0047] Figure 2A illustrates a perspective view of a cylindrical jelly roll and an electrode assembly cover during assembly, in accordance with an embodiment of the present disclosure;

[0048] Figure 2B illustrates a cross-sectional view of the cylindrical jelly roll and the electrode assembly cover during assembly, in accordance with an embodiment of the present disclosure;

[0049] Figure 3A illustrates a perspective view of an assembled cylindrical cell, in accordance with an embodiment of the present disclosure;

[0050] Figure 3B illustrates a cross-sectional view of the assembled cylindrical cell, in accordance with an embodiment of the present disclosure;

[0051] Figure 4A illustrates a cross-sectional view of a frist end of the assembled cylindrical cell, in accordance with an embodiment of the present disclosure;

[0052] Figure 4B illustrates a magnified view of Figure 4A, highlighting the height of the insulating tape, in accordance with an embodiment of the present disclosure; and

[0053] Figures 5A and 5B illustrate a method of assembling an electrode assembly forming a cylindrical cell, in accordance with an embodiment of the present disclosure.LIST OF REFERENCE NUMERALS USED IN THE DESCRIPTION AND DRAWING:DETAILED DESCRIPTION

[0054] Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.

[0055] Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating tospecific components and methods to provide a complete understanding of the embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known apparatus structures, and well-known techniques are not described in detail.

[0056] The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms “a”, “an”, and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms, “comprises”, “comprising”, “including” and “having” are open-ended transitional phrases and therefore, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0057] When an element is referred to as being “embodied thereon”, “engaged to”, “coupled to” or “communicatively coupled to” another element, it may be directly on, engaged, connected, or coupled to the other element. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed elements.

[0058] Cylindrical cells are a critical component of modem energy storage systems, commonly utilized in applications ranging from portable electronics to electric vehicles and renewable energy solutions. The efficiency and reliability of these cells are closely tied to their design, particularly the configuration of their internal components. A prevalent construction method involves winding the electrode assembly in a cylindrical jelly roll format, which optimizes space and enhances energy density.

[0059] In a standard cylindrical cell, the positive terminal is created by connecting a cathode disc to one end of the jelly roll, while the negative terminal is formed by an anode lid at the opposite end. Ensuring robust electrical connections between these components is essential for the cell's performance. However, the proximity of these terminals to an outer casing during assembly increases the risk of short circuits, making effective insulation a crucial aspect of cell design.

[0060] Traditionally, various insulating materials and techniques have been employed to safeguard against unintended electrical contact during the assembly. Nevertheless, existing methods may not fully address the challenges associated with the physical dimensions andarrangement of the components. Specifically, the insulation must not only prevent electrical contact during the assembly but also maintain a compact cell design that aligns with modem performance demands.

[0061] The present disclosure introduces an innovative approach to insulation in cylindrical cells by utilizing an insulating tape that is wound around the top end of the jelly roll. This insulating tape extends outward, with a carefully engineered height that is specifically designed to be less than the height of the positive terminal formed by the cathode disc while remaining greater than the height of the circumferential tab of the same disc. This design feature ensures effective insulation while maintaining the structural integrity and compactness of the cell.

[0062] By enhancing the insulation strategy in this manner, the present disclosure aims to improve both the safety and efficiency of cylindrical cells, addressing critical performance issues in the current technology landscape. This advancement represents a significant step forward in the ongoing pursuit of more effective and reliable energy storage solutions.

[0063] The cylindrical cell 100 is described with reference to Figures 1 to 4B, in accordance with the present disclosure. While the method 500 of assembling an electrode assembly forming the cylindrical cell 100 is described with reference to Figures 5A and 5B, in accordance with the present disclosure.

[0064] Figure 1 illustrates an exploded view of the cylindrical cell 100, in accordance with an embodiment of the present disclosure. The cylindrical cell 100 comprises an electrode assembly wound in a cylindrical jelly roll 102 configuration. The cylindrical jelly roll 102 has a first end 104 and a second end 108. The first end 104 is connected to a cathode disc 106 to form a positive terminal. The second end 108 is connected to an anode lid 110 to form a negative terminal.

[0065] In an embodiment, an insulating tape 112 is wound around the first end 104 of the cylindrical jelly roll 102. In said embodiment, the first end 104 is the top end of the cylindrical jelly roll 102. The insulating tape 112 extends out of the cylindrical jelly roll 102. The height of the insulating tape 112 is less than the height of the positive terminal of the cathode disc 106 and greater than the height of a circumferential tab of the cathode disc 106. This configuration of the insulating tape 112 ensures effective insulation of the circumferential tab during assembly of the cylindrical cell 100.

[0066] In an embodiment, the projection of the insulating tape 112 from the cylindrical jelly roll 102 is between 1.5 mm and 2 mm from the first end 104 of the cylindrical jelly roll 102.

[0067] In an embodiment, the insulating tape 112 is formed from a polyamide material with the following properties:• a peel adhesion of more than or equal to 500 gf / in;• a tensile strength of more than or equal to 1200 kgf / cm2;• an elongation of more than or equal to 50 percent; and• a breakdown voltage of more than or equal to 5 kV.

[0068] In an embodiment, the insulating tape 112 has an acrylic adhesive that is free from containing silicon (Si) or iron (Fe).

[0069] In an embodiment, the cylindrical cell 100 further comprises at least two retention tapes 114, 116 wound around the cylindrical jelly roll 102 at predetermined locations to secure the cylindrical jelly roll 102. In said embodiment, the retention tapes 114, 116 are positioned at a lower section and a midsection of the cylindrical jelly roll 102 to secure the cylindrical configuration.

[0070] In an embodiment, the insulating tape 112 has a thickness of less than or equal to the thickness of the retention tapes 114, 116.

[0071] In an embodiment, the cylindrical cell 100 further comprises a cathode insulator 118 positioned over the cathode disc 106, wherein the cathode insulator 118 has a circular washer shape. In said embodiment, the cathode insulator 118 is configured to electrically isolate a top surface of the cathode disc 106 from the surrounding structure, preventing short circuits and maintaining the electrical integrity of the cylindrical cell 100.

[0072] In an embodiment, the cylindrical cell 100 further comprises an electrode assembly cover 120 that houses the cylindrical jelly roll 102. Further, after assembly, the anode lid 110 engages with a bottom end of the electrode assembly cover 120 and is welded therein. Furthermore, the cathode disc 106 passes through a hole in a top surface of the electrode assembly cover 120 and is locked therein.

[0073] In an embodiment, the electrode assembly cover 120 is a hollow cylindrical member that provides a structural enclosure / casing for the cylindrical jelly roll 102,preventing mechanical damage during operation. The hollow cylindrical electrode assembly cover 120 has one closed end to align with the first end 104 of the cylindrical jelly roll 102 and has one open end to align with the second end 108 of the cylindrical jelly roll 102.

[0074] In an embodiment, the cylindrical cell 100 further comprises a rivet positive terminal 122 configured to lock the cathode disc 106 in a position relative to the electrode assembly cover 120.

[0075] In an embodiment, the rivet positive terminal 122 includes a locking mechanism that ensures a secure electrical connection between the cathode disc 106 and the positive terminal of the cylindrical cell 100.

[0076] In an embodiment, the cylindrical cell 100 further comprises a sealing pin 126 positioned along the central axis of the anode lid 110 to receive a closing pin 128 for sealing the negative terminal.

[0077] In an embodiment, a rivet gasket 124 is positioned between the rivet positive terminal 122 and the cathode disc 106, ensuring that the rivet positive terminal 122 makes contact only with the cathode disc 106 while remaining insulated from the electrode assembly cover 120. In said embodiment, the rivet gasket 124 is also shaped to fit snugly around the rivet positive terminal 122, creating a seal that prevents any movement or misalignment of the cathode disc 106 during the cylindrical cell 100 operation.

[0078] Figure 2A illustrates a perspective view of the cylindrical jelly roll 102 and the electrode assembly cover 120 during assembly, in accordance with an embodiment of the present disclosure. As can be seen from Figure 2A, the cylindrical jelly roll 102, along with the insulating tape 112 on the top / first end 104 is about to be inserted into the electrode assembly cover 120. Figure 2B illustrates a cross-sectional view of the insulating tape 112 wound around the cylindrical jelly roll 102 when the cylindrical jelly roll 102 is partially inserted inside the electrode assembly cover 120, in accordance with an embodiment of the present disclosure. As can be seen in a magnified view of Figure 2B, the insulating tape 112 maintains an insulation between the cathode disc 106 and the electrode assembly cover 120 during the assembly so that the short-circuit between the terminals of the cylindrical jelly roll 102 can be avoided.

[0079] Figure 3A illustrates a perspective view of an assembled cylindrical cell 100, in accordance with an embodiment of the present disclosure. Figure 3B illustrates a cross- sectional view of the assembled cylindrical cell 100, in accordance with an embodiment ofthe present disclosure. As can be seen from Figures 3A and 3B, the insulating tape 112 extends above the top surface of the cathode disc 106 of the cylindrical jelly roll 102. This configuration of the insulating tape 112 ensures effective insulation of the circumferential tab of the cathode disc 106 during assembly of the cylindrical cell 100.

[0080] Figure 4A illustrates a cross-sectional view of the first end 104 of the assembled cylindrical cell 100, in accordance with an embodiment of the present disclosure. Figure 4B illustrates a magnified view of Figure 4A, highlighting the height of the insulating tape 112, in accordance with an embodiment of the present disclosure. As can be seen from Figure 4B, the height of the insulating tape 112 is less than the height H2 of a top end 402 of the cathode disc 106 and greater than the height Hl of a circumferential tab 404 of the cathode disc 106. This configuration not only enhances insulation and reduces the risk of electrical shorts but also contributes to the structural integrity and manufacturability of the cylindrical cell 100.

[0081] In an operative configuration, the cylindrical cell 100 is assembled by initially preparing the electrode assembly. The electrode materials, including a cathode, separator, and anode, are layered and wound into the cylindrical jelly roll 102. The winding process is carefully controlled to ensure uniform spacing and alignment of layers, thereby maintaining consistency in electrochemical performance. Upon completing the winding, the first end 104 of the cylindrical jelly roll 102 is connected to the cathode disc 106 to form the positive terminal, while the second end 108 is connected to the anode lid 110 to form the negative terminal.

[0082] Further, to maintain the cylindrical configuration of the jelly roll 102 during handling and assembly, the two retention tapes 114 and 116 are wound around the jelly roll 102 at a lower section and a midsection, respectively. These tapes 114, 116 provide mechanical reinforcement to prevent deformation or loosening of the wound layers.

[0083] Then, the insulating tape 112 made of polyamide is wound around the first end 104 of the jelly roll 102. The insulating tape 112 extends outward from the jelly roll 102 such that its height is less than the height of the top end 402 of the cathode disc 106 but greater than the height of the circumferential tab 404. The insulating tape 112 is selected to have a peel adhesion of at least 500 gf / in, a tensile strength of at least 1200 kgf / cm2, an elongation of at least 50 percent, and a breakdown voltage of 5 kV or more. The acrylic adhesive used for bonding is free from silicon and iron content to prevent contamination and improve chemical compatibility.

[0084] Following this, the cathode insulator 118, having a washer shape, is positioned over the cathode disc 106. The cylindrical jelly roll 102 is then inserted into the electrode assembly cover 120 such that the cathode disc 106 passes through a hole in the top surface of the electrode assembly cover 120, and the anode lid 110 aligns with and is welded to the bottom end of the electrode assembly cover 120. During insertion, the insulating tape 112 prevents the cathode disc 106 or the circumferential tab 404 from coming into contact with the electrode assembly cover 120, thereby ensuring electrical isolation.

[0085] Thereafter, the rivet gasket 124 is positioned to sit between the cathode disc 106 and the rivet positive terminal 122. The rivet positive terminal 122 is then inserted and locked in place, securing the cathode disc 106 and completing the positive terminal. The rivet gasket 124 ensures that the rivet positive terminal 122 maintains electrical contact exclusively with the cathode disc 106 while remaining insulated from the electrode assembly cover 120.

[0086] To complete the sealing of the cylindrical cell 100, the sealing pin 126 is aligned along the central axis of the anode lid 110 and receives the closing pin 128 to finalize the negative terminal. The assembled cylindrical cell 100 thus demonstrates enhanced insulation performance, mechanical stability, and structural integrity, while reducing the risk of internal short circuits and improving manufacturing consistency.

[0087] Figures 5A and 5B illustrate a method 500 of assembling an electrode assembly forming a cylindrical cell 100, in accordance with an embodiment of the present disclosure. The order in which the method 500 is described is not intended to be construed as a limitation, and any number of the described method steps can be combined in any appropriate order to carry out the method 500 or an alternative method. Additionally, individual steps may be deleted from the method 500 without departing from the scope of the subject matter described herein. The method 500 of assembling an electrode assembly for a cylindrical cell 100. The method 500 includes the following steps:

[0088] In method step 502, the method 500 includes winding an electrode assembly into a cylindrical jelly roll 102.

[0089] In method step 504, the method 500 includes connecting a first end 104 of the cylindrical jelly roll 102 to a cathode disc 106 to form a positive terminal.

[0090] In method step 506, the method 500 includes connecting a second end 108 of the cylindrical jelly roll 102 to an anode lid 110 to form a negative terminal.

[0091] In method step 508, the method 500 includes applying at least two retention tapes 114, 116 around the cylindrical jelly roll 102 at predetermined locations to maintain its cylindrical configuration.

[0092] In method step 510, the method 500 includes winding an insulating tape 112 around the first end 104 of the cylindrical jelly roll 102, wherein the insulating tape 112 extends out of the cylindrical jelly roll, and wherein the height of the insulating tape 112 is less than the height H2 of a top end 402 of the cathode disc 106 and greater than the height Hl of a circumferential tab 404 of the cathode disc 106.

[0093] In method step 512, the method 500 includes positioning a cathode insulator 118 over the cathode disc 106.

[0094] In method step 514, the method 500 includes inserting the cylindrical jelly roll 102 into a hollow electrode assembly cover 120.

[0095] In method step 516, the method 500 includes aligning the anode lid 110 with a bottom end of the hollow electrode assembly cover 120 and passing the central portion of the cathode disc 106 through a hole in a top surface of the electrode assembly cover 120.

[0096] In method step 518, the method 500 includes locking the cathode disc 106 in place using a rivet positive terminal 122.

[0097] Thus, the present disclosure addresses these aforementioned challenges by introducing an insulating tape that not only provides electrical insulation but also enhances the structural integrity of the assembly. The proposed cylindrical cell design features an insulating tape wound around the first / top end of the cylindrical jelly roll, with specific height dimensions that ensure compatibility with the positive terminal of the cathode disc. This innovative approach seeks to improve the safety and efficiency of cylindrical cells while maintaining their compact design, ultimately contributing to the advancement of battery technology.

[0098] The foregoing description of the embodiments has been provided for purposes of illustration and is not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment but are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.TECHNICAL ADVANCEMENTS AND ECONOMIC SIGNIFICANCE

[0099] The present disclosure described herein above has several technical advantages including, but not limited to, a cylindrical cell and a method for assembling an electrode assembly forming the cylindrical cell, which:• effectively prevents short circuits between the electrode assembly and the surrounding structure while improving the overall safety and efficiency of the cell;• ensures optimal insulation of the electrode assembly, particularly between the cathode and anode terminals;• simplifies the assembly process, enhancing manufacturing efficiency and minimizing material waste; and• provides improved durability, ensuring long-term performance in various environmental conditions.

[0100] The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[0101] The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and / or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

[0102] The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.

[0103] Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.

[0104] The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher / lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.

[0105] While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment, as well as other embodiments of the disclosure, will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

Claims

CLAIMS:

1. A cylindrical cell (100) comprising: an electrode assembly wound in a cylindrical jelly roll (102) configuration; a first end (104) of the cylindrical jelly roll (102) connected to a cathode disc (106) to form a positive terminal; a second end (108) of the cylindrical jelly roll (102) connected to an anode lid (110) to form a negative terminal; at least two retention tapes (114,116) applied around the cylindrical jelly roll (102) at predetermine locations to maintain its cylindrical configuration; and an insulating tape (112) wound around the first end (104) of the cylindrical jelly roll (102), wherein:• the insulating tape (112) extends out of the cylindrical jelly roll (102); and• the height of the insulating tape (112) is less than the height (H2) of a top end (402) of the cathode disc (106) and greater than the height (Hl) of a circumferential tab (404) of the cathode disc (106).

2. The cylindrical cell (100) as claimed in claim 1, wherein the insulating tape (112) has a thickness of less than or equal to the thickness of the at least two retention tapes (114, 116).

3. The cylindrical cell (100) as claimed in claim 1, wherein the at least two retention tapes (114, 116) are positioned at a lower section and a midsection of the cylindrical jelly roll (102) to secure the cylindrical configuration.

4. The cylindrical cell (100) as claimed in claim 1, wherein the projection of the insulating tape (112) from the cylindrical jelly roll (102) is between 1.5 mm and 2 mm from the first end (104) of the cylindrical jelly roll (102).

5. The cylindrical cell (100) as claimed in claim 1, wherein the insulating tape (112) is formed from a polyamide material with the following properties:• a peel adhesion of more than or equal to 500 gf / in;• a tensile strength of more than or equal to 1200 kgf / cm2;• an elongation of more than or equal to 50 percent; and• a breakdown voltage of more than or equal to 5 kV.

6. The cylindrical cell (100) as claimed in claim 1, wherein the insulating tape (112) has acrylic adhesive that is free from containing silicon (Si) or iron (Fe).

7. The cylindrical cell (100) as claimed in claim 1, further comprises a cathode insulator (118) positioned over the cathode disc (106), wherein the cathode insulator (118) having a circular washer shape.

8. The cylindrical cell (100) as claimed in claim 7, wherein the cathode insulator (118) is configured to electrically isolate the cathode disc (106) from surrounding structure, preventing short circuits and maintaining the electrical integrity of the cylindrical cell (100).

9. The cylindrical cell (100) as claimed in claim 1, further comprises an electrode assembly cover (120) that houses the cylindrical jelly roll (102), wherein the anode lid (110) engages with a bottom end of the electrode assembly cover (120), and the cathode disc (106) passes through a hole in the top surface of the electrode assembly cover (120).

10. The cylindrical cell (100) as claimed in claim 1, wherein the electrode assembly cover (120) is a hollow cylindrical member that provides a structural enclosure for the cylindrical jelly roll (102), preventing mechanical damage during operation.

11. The cylindrical cell (100) as claimed in claim 9, further comprises a rivet positive terminal (122) configured to lock the cathode disc (106) in a position relative to the electrode assembly cover (120).

12. The cylindrical cell (100) as claimed in claim 11, wherein the rivet positive terminal (122) includes a locking mechanism that ensures a secure electrical connection between the cathode disc (106) and the positive terminal of the cylindrical cell (100).

13. The cylindrical cell (100) as claimed in claim 11, further comprises a sealing pin (126) positioned along the central axis of the anode lid (110) to receive a closing pin (128) for sealing the negative terminal.

14. A method (500) of assembling an electrode assembly forming a cylindrical cell (100), comprising: winding (502) an electrode assembly into a cylindrical jelly roll (102); connecting (504) a first end (104) of the cylindrical jelly roll (102) to a cathode disc (106) to form a positive terminal; connecting (506) a second end (108) of the jelly roll (102) to an anode lid (110) to form a negative terminal; applying (508) at least two retention tapes (114, 116) around the cylindrical jelly roll (102) at predetermined locations to maintain its cylindrical configuration; winding (510) an insulating tape (112) around the first end (104) of the cylindrical jelly roll (102), wherein the insulating tape (112) extends out of the cylindrical jelly roll (102), and wherein the height of the insulating tape (112) is less than the height (H2) of a top end (402) of the cathode disc (106) and greater than the height (Hl) of a circumferential tab (404) of the cathode disc (106); positioning (512) a cathode insulator (118) over the cathode disc (106); inserting (514) the cylindrical jelly roll (102) into a hollow electrode assembly cover (120); aligning (516) the anode lid (110) with a bottom end of the hollow electrode assembly cover (120) and passing the central portion of the cathode disc (106) through a hole in a top surface of the electrode assembly cover ( 120); and locking (518) the cathode disc (106) in place using a rivet positive terminal (122).

15. The method as claimed in Claim 14, in which the insulating tape (112) is wound in a manner such that the projection of the insulating tape (112) from the cylindrical jelly roll (102) is 1.5 mm and 2 mm from the first stand (104) of the cylindrical jelly roll (102).

16. The method as claimed in Claim 14 or 15, which includes an additional step of positioning a cathode insulator (118) over the cathode disc (106), the cathode insulator (118) having a circular washer shape.

17. The method as claimed in any one of claims 14 to 16, which comprises the step of housing the cylindrical jelly roll (102) in an electrode assembly cover (120), engaging the anode lid (110) with a bottom end of electrode assembly cover (120) and allowing the cathode disc (106) to pass through a hole in the top surface of the electrode assembly cover (120)18. The method as claimed in any one of claims 14 to 17, which comprises the step of locking the cathode disc (106) with the help of a rivet positive terminal (122) in a position relative to the electrode assembly cover (120).

19. The method as claimed in any one of claims 14 to 18, which comprises the step of securing the electric connection between the cathode disc (106) and positive terminal of cylindrical cell (100) by means of a locking mechanism included in the rivet positive terminal (122)20. The method as claimed in any one of claims 14 to 19 which comprises the step of sealing the negative terminal by positioning a sealing pin (126) along the central axis of the anode lid ( 110)

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