Description:TECHNICAL FIELD
[001] The embodiments herein generally relate to a cylindrical battery cell and more particularly to a cylindrical can assembly with a multi-layered crimp configuration for achieving hermetic sealing at the interface between a current collector lid and a cylindrical can.
BACKGROUND
[002] Generally, cylindrical lithium-ion batteries are widely used in consumer electronics, electric vehicles and energy storage applications. Typically, the cylindrical battery cell mainly includes a cylindrical can and an electrode assembly. The cylindrical can is usually made of steel or aluminum, which serves as both the container and one of the electrode terminal (negative terminal) of the cylindrical battery cell. Usually, the electrode assembly is provided in the form of a jelly roll configuration which is formed by tightly winding the positive and negative electrodes (cathode and anode) with a separator in between, and the electrode assembly is placed inside the cylindrical can. An electrolyte is introduced in the jelly roll for facilitating movement of ions between the electrodes during charge and discharge cycles. The separator which is made from a microporous polymer isolates the two electrodes from each other while allowing the flow of ions. Further, the cylindrical battery cell includes a top current collector lid and a bottom current collector lid in which each current collector lid is connected to the corresponding electrode tab of the jelly roll to ensure efficient electric charge flow in and out of the cylindrical battery cell. Typically, these current collector lids are provided in form of solid metal type lids in which the top current collector lid is insulated and riveted with the cylindrical can by using an insulating gasket (rivet gasket) and a terminal rivet respectively. In this case, the uneven thickness of the solid metal type current collectors is subjected to poor electrical conductivity and poor thermal performance during operation of the cylindrical battery cell.
[003] Usually, in a large format cylindrical battery cell, the insulating gasket is inserted into a through hole formed in the cylindrical can from an outer side of the cylindrical can such that the insulating gasket is interposed between the cylindrical can and the terminal rivet to isolate the terminal rivet from the cylindrical can. The terminal rivet is riveted against the cylindrical can via the insulating gasket to prevent electrolyte leakage from the cylindrical cell. The terminal rivet acts as an electrode terminal which is connected to the corresponding electrode tabs of the jelly roll through the top current collector lid. The cylindrical battery cell is subjected to repeated temperature and pressure fluctuations as a result of charging, discharging and also because of varying ambient temperatures during operation of the cylindrical battery cell. The repeated temperature and pressure fluctuations inside the cylindrical battery cell may weaken the mechanical contact between the terminal rivet, the insulating gasket and the cylindrical can. For example, a crimp region of the terminal rivet may deform such that the contact surface between terminal rivet and the insulating gasket may be spaced apart from each other. Further, locating and crimping of the top current collector lid with the cylindrical can through the insulating gasket (rivet gasket) and the terminal rivet may be difficult especially for a novice. For example, in some cases, the top current collector lid may not be properly crimped to the cylindrical can. The deformation of the crimp region or the improper crimping of the top current collector lid, increases the possibility of electrolyte leakage from the cylindrical battery cell thereby decreasing the safety and lifetime of the cylindrical battery cell as well as causes contamination of the electrolyte due to entry of foreign contaminants into the cylindrical battery cell which is undesirable.
[004] Manufacturing of machined rivet (terminal rivet) may be difficult and incurs high cost when compared to manufacturing of the current collector lid. Further, the cylindrical battery cell has uneven top surface and requires separate insulators for the terminal rivet and the top current collector lid thereby increasing the cost of the cylindrical battery cell as well as consuming more packaging space in the cylindrical battery cell which in turn decreases the space inside the cylindrical battery cell thereby decreasing the cell volume energy density of the cylindrical battery cell.
[005] Therefore, there exists a need for a cylindrical can assembly which obviates the aforementioned drawbacks.
OBJECTS
[006] The principal object of embodiments herein is to provide a cylindrical can assembly for a cylindrical battery cell with a multi-layered crimp configuration for achieving hermetic sealing at the interface between a current collector lid and a cylindrical can.
[007] Another object of embodiments herein is to easily locate and crimp the current collector lid with the cylindrical can of the cylindrical can assembly.
[008] Another object of embodiments herein is to provide the cylindrical can assembly with the current collector lid which is configured to act both as a corresponding current collector and a corresponding electrode terminal of the cylindrical battery cell at the same time.
[009] Another object of embodiments herein is to provide the cylindrical can assembly with the multi-layered crimp configuration which ensures rigid sealability between the cylindrical can and the current collector lid to restrict leakage of electrolyte from the cylindrical battery cell thereby enhancing safety and lifetime of the cylindrical battery cell.
[0010] Another object of embodiments herein is to provide the cylindrical can assembly with a top flushed surface which consumes less packaging space for crimping of the current collector lid with the cylindrical can thereby increasing the space inside the cylindrical battery cell for improving the cell volume energy density.
[0011] Another object of embodiments herein is to improve the ease of wire bonding during busbar welding with respect to the cylindrical battery cell.
[0012] Another object of embodiments herein is to provide the cylindrical can assembly with a sheet metal type current collector lid which acts both as the corresponding current collector and the corresponding electrode terminal at the same time, as opposed to the conventional machined terminal rivet and conventional solid metal type current collector lid thereby reducing the costs incurred in manufacturing the cylindrical battery cell.
[0013] Another object of embodiments herein is to enhance tight fitting and sealing of the current collector lid with the cylindrical can via an insulator thereby providing hermetic contact of the current collector lid with the cylindrical can via the insulator.
[0014] Another object of embodiments herein is to ensure a secure mechanical connection between the cylindrical can, the insulator and the current collector lid during long time use, and repeated temperature and pressure fluctuations inside the cylindrical battery cell.
[0015] Another object of embodiments herein is to provide the sheet metal current collector lid with uniform thickness for better electrical conductivity and thermal performance during operation of one of a lithium-iron-phosphate (LFP) based cylindrical battery cell and a lithium-nickel-manganese-cobalt-oxide (NMC) based cylindrical battery cell.
[0016] Another object of embodiments herein is to increase contact surface between the current collector lid and a current collector disc of the cylindrical battery cell.
[0017] Another object of embodiments herein is to reduce the number of insulators used in the cylindrical battery cell thereby reducing the costs of the cylindrical battery cell.
[0018] Another object of embodiments herein is to prevent entry of contaminants into the cylindrical battery cell.
[0019] Another object of embodiments herein is to provide the cylindrical can assembly which is reliable and easy to manufacture.
[0020] These and other objects of embodiments herein will be better appreciated and understood when considered in conjunction with following description and accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF DRAWINGS
[0021] The embodiments are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0022] Fig. 1 depicts an exploded view of a cylindrical battery cell, according to embodiments as disclosed herein;
[0023] Fig. 2 depicts an exploded view of a cylindrical can assembly of the cylindrical battery cell, according to embodiments as disclosed herein;
[0024] Fig. 3 depicts a sectional view of the cylindrical can assembly before crimping an insulator and a current collector lid against a cylindrical can, according to embodiments as disclosed herein;
[0025] Fig. 4 depicts a sectional view of the cylindrical can assembly when the insulator and the current collector lid is crimped with the cylindrical can, according to embodiments as disclosed herein;
[0026] Fig. 5 depicts a sectional view of the cylindrical can of the cylindrical can assembly, according to embodiments as disclosed herein;
[0027] Fig. 6 depicts a sectional view of the insulator of the cylindrical can assembly, according to embodiments as disclosed herein;
[0028] Fig. 7 depicts a sectional view of the current collector lid of the cylindrical can assembly, according to embodiments as disclosed herein;
[0029] Fig. 8 depicts another sectional view of the cylindrical can assembly before crimping the insulator and the current collector lid against the cylindrical can, according to embodiments as disclosed herein; and
[0030] Fig. 9 depicts a sectional view of the cylindrical can assembly when the insulator and the current collector lid is crimped with the cylindrical can, according to embodiments as disclosed herein.

DETAILED DESCRIPTION
[0031] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed 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.
[0032] The embodiments herein achieve a cylindrical can assembly for a cylindrical battery cell with a multi-layered crimp configuration for achieving hermetic sealing at the interface between a current collector lid and a cylindrical can. Further, embodiments herein achieve the cylindrical can assembly with the multi-layered crimp configuration which ensures a secure mechanical connection between the cylindrical can, the insulator and the current collector lid during long time use, and repeated temperature and pressure fluctuations inside the cylindrical battery cell. Referring now to Figs. 1 to 9, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0033] Fig. 1 depicts an exploded view of the cylindrical battery cell (10), according to embodiments as disclosed herein. Fig. 2 depicts an exploded view of a cylindrical can assembly (100) of the cylindrical battery cell (10), according to embodiments as disclosed herein. In an embodiment, the cylindrical battery cell (10) includes a cylindrical can assembly (100), a current collector disc (200), a battery cell jelly roll (300), a closing pin (400), a sealing plug (500) and a bottom current collector lid (600). Further, in an embodiment, the cylindrical can assembly (100) includes a cylindrical can (102), an insulator (104) and a current collector lid (106). For the purpose of this description and ease of understanding, the cylindrical can assembly (100) is explained herein with below reference to be provided with a multi-layered crimp configuration (100L) (as shown in fig. 4) for achieving hermetic sealing at the interface between the current collector lid (106) and the cylindrical can (102) in the cylindrical battery cell (10) such as but not limited to a large format cylindrical battery cell.
[0034] The current collector disc (200) is connected with the current collector lid (106) and a corresponding electrode tab of the battery cell jelly roll (300). The battery cell jelly roll (300) is formed by tightly winding the positive and negative electrodes (cathode and anode) with a separator therebetween. The sealing plug (500) is received by a central hollow tubular section (602) (as shown in fig. 1) of the bottom current collector lid (600) to prevent leakage of electrolyte from a core (not shown) of battery cell jelly roll (300). The closing pin (400) is pressed against the bottom current collector lid (600) and the sealing plug (500) after filling the electrolyte into the core of the battery cell jelly roll (300). The bottom current collector lid (600) is connected to a corresponding open end of the cylindrical can (102) thereby closing the open end of the cylindrical can (102). Further, the bottom current collector lid (600) is adapted to facilitate electric charge flow in and out of the cylindrical battery cell (10).
[0035] In an embodiment, the current collector lid (106) is configured to act as the negative terminal (anode terminal) of the cylindrical battery cell (10) when the current collector lid (106) is connected to negative electrode tabs of the jelly roll (300) via the current collector disc (200), and whereas the cylindrical can (102) is configured to act as the positive terminal (cathode terminal) of the cylindrical battery cell (10) when the bottom current collector lid (600) is connected to positive electrode tabs of the battery cell jelly roll (300). In another embodiment, the current collector lid (106) is configured to act as a positive terminal (cathode terminal) of the cylindrical battery cell (10) when the current collector lid (106) is connected to positive electrode tabs of the jelly roll (300) via the current collector disc (200), and whereas the cylindrical can (102) is configured to act as a negative terminal (anode terminal) of the cylindrical battery cell (10) when the bottom current collector lid (600) is connected to negative electrode tabs of the battery cell jelly roll (300).
[0036] Fig. 5 depicts a sectional view of the cylindrical can (102) of the cylindrical can assembly (100), according to embodiments as disclosed herein. The cylindrical can (102) is adapted to house/ accommodate the battery cell jelly roll (300) therein. The cylindrical can (102) includes a cylindrical body (102A) and a lid holding portion (102B) provided at a corresponding end (top end) of the cylindrical body (102A). Another end (bottom end) of the cylindrical body (102A) of the cylindrical can (102) is open. The lid holding portion (102B) of the cylindrical can (102) includes a central opening (102BP) and a flange (102BF) extending from the lid holding portion (102B) along a circumference of the central opening (102BP) in a direction towards the insulator (104). The flange (102BF) of the cylindrical can (102) is adapted to facilitate locating and crimping of the insulator (104) and the current collector lid (106) with the cylindrical can (102). In an embodiment, the cylindrical can (102) is configured to have uniform thickness along its entirety. For example, each of the cylindrical body (102A), the lid holding portion (102B) and the flange (102BF) of the cylindrical can (102) are configured to have uniform thickness.
[0037] For the purpose of this description and ease of understanding, the sizes or dimensions of the components (102, 104, 106) of the cylindrical can assembly (100) of the cylindrical battery cell (10) is considered herein with respect to a large format cylindrical battery cell such as 4680 battery. However, it is also within the scope of the invention to consider the components (102, 104, 106) of the cylindrical can assembly (100) to be provided in any other sizes and configurations of the cylindrical battery cell. A thickness (T1) (as shown in fig. 5) of the cylindrical can (102) is 0.6 mm. In another example, the thickness (T1) of the cylindrical can (102) is in the range of 0.4 to 0.8 mm. An outer diameter (A1) (as shown in fig. 5) of the flange (102BF) of the lid holding portion (102B) of the cylindrical can (102) is at least 30 mm. In another example, the outer diameter (A1) of the flange (102BF) of the lid holding portion (102B) of the cylindrical can (102) is in the range of 27 to 33 mm. An outer diameter (A2) (as shown in fig. 5) of the cylindrical body (102A) of the cylindrical can (102) is 46 mm. In another example, the outer diameter (A2) of the cylindrical body (102A) of the cylindrical can (102) is in the range of 44 to 48 mm. A height (H1) (as shown in fig. 5) of the cylindrical can (102) is 82.1 mm or 82.3 mm. In another example, the height (H1) of the cylindrical can (102) is in the range of 80 to 85 mm. The cylindrical can (102) is manufactured by sheet metal stamping process thereby reducing the manufacturing cost of the cylindrical battery cell (10).
[0038] The insulator (104) is interposed between the current collector lid (106) and the cylindrical can (102) to insulate the current collector lid (106) from the cylindrical can (102) thereby preventing short circuit, since the bottom end (open end) of the cylindrical can (102) is welded to the bottom current collector lid (600). A portion of the insulator (104) is inserted into the central opening (102BP) of the lid holding portion (102B) of the cylindrical can (102) from an inner side of the cylindrical can (102). The insulator (104) is adapted to be affixed (crimped) with the flange (102BF) of the cylindrical can (102) in which a central opening (104P) (as shown in fig. 2) of the insulator (104) is positioned co-axial to the central opening (102BP) of the cylindrical can (102). Further, the insulator (104) is configured to seal an interface between the current collector lid (106) and the cylindrical can (102) along the circumference of the central opening (102BP) of the cylindrical can (102) thereby preventing electrolyte leakage from the cylindrical battery cell (10) since the insulator (104) is compressed to 30 to 40% between the current collector lid (106) and the cylindrical can (102).
[0039] Fig. 6 depicts a sectional view of the insulator (104) of the cylindrical can assembly (100), according to embodiments as disclosed herein. In an embodiment, the insulator (104) includes a first wall (104A), a wall interconnecting section (104B), a second wall (104C), a flange (104D) and at least one sealing lip (104E) (as shown in fig. 6). The first wall (104A) of the insulator (104) defines the central opening (104P) extending therethrough. The first wall (104A) of the insulator (104) is an inner circular wall positioned in a vertical orientation. The first wall (104A) of the insulator (104) is adapted to be received by the central opening (102BP) of the cylindrical can (10) therein such that the first wall (104A) of the insulator (104) is engaged with a corresponding portion (outer side) (not shown) of the flange (102BF) of the cylindrical can (102). The top surface (104T) of the insulator (104) is defined on a top end of each of the first wall (104A) and the sealing lip (104E) of the insulator (104). The top surface (104T) (as shown in figs. 3 and 6) of each of the first wall (104A) and the sealing lip (104E) of the insulator (104) is co-planar to the top surface (102T) (as shown in fig. 3) of the lid holding portion (102B) of the cylindrical can (102) and the top surface (106T) (as shown in fig. 3) of the current collector lid (106). The wall interconnecting section (104B) of the insulator (104) is adapted to extend from a bottom end of the first wall (104A) along its circumference. The wall interconnecting section (104B) of the insulator (104) is adapted to connect a bottom end of the second wall (104C) with the bottom end of the first wall (104A) of the insulator (104). The wall interconnecting section (104B) of the insulator (104) defines an arcuate section or a non-linear section. However, it is also within the scope of the invention to provide the wall interconnecting section (104B) in any other shape or profile without otherwise deterring the intended function of the wall interconnecting section (104B) of the insulator (104) as can be deduced from the description and corresponding drawings. The second wall (104C) of the insulator (104) is adapted to upwardly extend from the wall interconnecting section (104B) along its circumference. The second wall (104C) of the insulator (104) is an outer circular wall which is positioned parallel and spaced at a predefined distance from the first wall (104A). The second wall (104C) of the insulator (104) is adapted to be engaged with a corresponding another portion (inner side) (not shown) of the flange (102BF) of the cylindrical can (102). A top end of the first wall (104A) of the insulator (104) is disposed on a plane positioned above and spaced apart from the flange (104D) and a top end of the second wall (104C) of the insulator (104). The first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) defines a can flange receiving portion (104R) (locating space) (as shown in fig. 6) adapted to receive the flange (102BF) of the cylindrical can (102) therein such that the first wall (104A) and the second wall (104C) are engaged with corresponding portion of the flange (102BF) of the cylindrical can (102) when the first wall (104A) of the insulator (104) is inserted into the central opening (102BP) of the cylindrical can (102) from an inner side of the cylindrical can (102). The flange (104D) of the insulator (104) is adapted to outwardly extend from a corresponding end (top end) of the second wall (104C) along its circumference in a direction towards the cylindrical body (102A) of the cylindrical can (102). The flange (104D) of the insulator (104) is engaged with a bottom surface (102BS) (as shown in figs. 2 and 4) of the lid holding portion (102B) of the cylindrical can (102) to cover the bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) thereby insulating the current collector lid (106) from the cylindrical can (102) when the current collector lid (106) is crimped to the cylindrical can (102) via the insulator (104). The sealing lip (104E) of the insulator (104) extends from the top end of the first wall (104A) along an inner circumference of the first wall (104) in a direction towards the current collector lid (106). The sealing lip (104E) of the insulator (104) is adapted to be engaged with the current collector lid (106) thereby hermetically sealing the interface between the insulator (104) and the current collector lid (106). In an embodiment, the sealing lip (104E) is an integral part of the first wall (104A) of the insulator (104).
[0040] In an embodiment, the insulator (104) is configured to have uniform thickness along its entirety. For example, each of the first wall (104A), the wall interconnecting section (104B) and the second wall (104C), the flange (104D) and the sealing lip (104E) of the insulator (104) are configured to have uniform thickness. In an embodiment, the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) defines a U shape configuration which extends along its circumference before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102). Further, in an embodiment, the U shape configuration of the insulator (104) is adapted to facilitate locating and crimping of the insulator (104) and the current collector lid (106) with the lid holding portion (102B) of the cylindrical can (102) via the flange (102BF) of the cylindrical can (102). Furthermore, in an embodiment, the U shape configuration of the insulator (104) is adapted to facilitate better sealability of the current collector lid (106) with the cylindrical can (102) when the current collector lid (106) is crimped with the cylindrical can (102) via the insulator (104).
[0041] The insulator (104) is manufactured by injection molding process. Before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102), the insulator (104) has the dimensional values as follows. A thickness (T2) (as shown in fig. 6) of the insulator (104) is 0.6 mm. In another example, the thickness (T2) of the insulator (104) is in the range of 0.4 to 0.8 mm. An outer diameter (B1) (as shown in fig. 6) of the first wall (104A) of the insulator (104) is 27±0.2 mm. In another example, the outer diameter (B1) of the first wall (104A) of the insulator (104) is in the range of 25 mm to 28 mm. An outer diameter (B2) (as shown in fig. 6) of the second wall (104C) of the insulator (104) is 28.4±0.2 mm. In another example, the outer diameter (B2) of the second wall (104C) of the insulator (104) is in the range of 27.4 mm to 30.4 mm. An outer diameter (B3) (as shown in fig. 6) of the flange (104D) of the insulator (104) is 44±0.1 mm. In another example, the outer diameter (B3) of the flange (104D) of the insulator (104) is in the range of 40 to 50 mm. A height (H2) (as shown in fig. 6) of the insulator (104) is 7.2 mm or 7.3 mm. In another example, the height (H2) of the insulator (104) is in the range of 5 to 9 mm. A distance (S1) (as shown in fig. 6) from the first wall (104A) to the second wall (104C) of the insulator (104) is 0.6 or 0.7 mm. In another example, the distance (S1) from the first wall (104A) to the second wall (104C) of the insulator (104) is in the range of 0.4 to 0.9 mm. S1 is the locating space (104R) which is defined between the first wall (104A) and the second wall (104C) of the insulator (104).
[0042] The current collector lid (106) is adapted to facilitate electric charge flow in and out of the cylindrical battery cell (10), and at the same time the current collector lid (106) is configured to act as a corresponding electrode terminal of the cylindrical battery cell (10). Further, the current collector lid (106) is adapted to hold the insulator (104) against the cylindrical can (102). A portion of the current collector lid (106) is inserted into the central opening (104P) of the insulator (104) from an inner side of the cylindrical can (102) thereby closing the central opening (104P) of the insulator (104) and the central opening (102BP) of the cylindrical can (102) by the current collector lid (106). Further, the current collector lid (106) is adapted to be affixed (crimped) with the flange (102BF) of the cylindrical can (102) via the insulator (104) thereby maintaining the closing of the central opening (104P) of the insulator (104) and the central opening (102BP) of the cylindrical can (102) by the current collector lid (106). The current collector lid (106) is adapted to be connected to a corresponding electrode tab (not shown) of the battery cell jelly roll (300) though the current collector disc (200). The current collector lid (104) is configured to act both as the corresponding current collector and the corresponding electrode terminal of the cylindrical battery cell (10) at the same time.
[0043] Fig. 7 depicts a sectional view of the current collector lid (106) of the cylindrical can assembly (100), according to embodiments as disclosed herein. In an embodiment, the current collector lid (106) includes a base (106A), a first wall (106B), a first wall interconnecting section (106C), a second wall (106D), a second wall interconnecting section (106E) and a third wall (106F). Further, in an embodiment, the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) of the current collector lid (106) defines an insulating wall receiving portion (106R). For the purpose of this description and ease of understanding, the insulating wall receiving portion (106R) of the current collector lid (106) is considered to be a space (locating space). The insulating wall receiving portion (106R) of the current collector lid (106) is adapted to receive the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) therein such that the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) are engaged with the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) respectively when the second wall (106D) of the current collector lid (106) is inserted into the central opening (104P) of the insulator (104) from the inner side of the cylindrical can (102).
[0044] The base (106A) of the current collector lid (106) is engaged with the current collector disc (200) thereby connecting the current collector lid (106) with the corresponding electrode tab (not shown) of the battery cell jelly roll (300) via the current collector disc (200). The base (106A) of the current collector lid (106) is positioned on a first plane (P1) (as shown in fig. 7) in a horizontal orientation. The base (106A) of the current collector lid (106) defines a circular shape configuration. The first wall (106B) of the current collector lid (106) is adapted to upwardly extend from the base (106A) along its circumference. The base (106A) and the first wall (106B) of the current collector lid (106) defines a space (106S) (as shown in fig. 7) (cavity) therebetween. The first wall (106B) of the current collector lid (106) is an inner circular wall which is positioned in a vertical orientation. The first wall interconnecting section (106C) of the current collector lid (106) is adapted to outwardly extend from a corresponding end (top end) of the first wall (106B) along its circumference. An outer surface of each of the base (106A), the first wall (106B) and the first wall interconnecting section (106C) of the current collector lid (106) is exposed to outside.
[0045] The first wall interconnecting section (106C) of the current collector lid (106) is positioned on a second plane (P2) (as shown in fig. 7) that is positioned above and spaced apart from the first plane (P1) onto which the base (106A) of the current collector lid (106) is positioned thereon. Further, the first wall interconnecting section (106C) of the current collector lid (106) is adapted to connect the top end of the first wall (106B) with a top end of the second wall (106D) of the current collector lid (106). The top surface (106T) of the current collector lid (106) is defined on top end of the first wall interconnecting section (106C) of the current collector lid (106). The top surface (106T) of the first wall interconnecting section (106C) of the current collector lid (106) is co-planar to the top surface (102T) of the lid holding portion (102B) of the cylindrical can (102) and the top surface (104T) of the insulator (104).
[0046] The second wall (106D) of the current collector lid (106) is adapted to downwardly extend from the first wall interconnecting section (106C) along its circumference in a direction towards the current collector disc (200). The second wall (106D) of the current collector lid (106) is adapted to be received by the central opening (104P) of the insulator (104). Each of the base (106A), the first wall (106B) and the first wall interconnecting section (106C) of the current collector lid (106) are adapted to close the central opening (104P) of the insulator (104) when the second wall (106D) of the current collector lid (106) is inserted into the central opening (104P) of the insulator (104). The second wall (106D) of the current collector lid (106) is an intermediate circular wall which is positioned in a vertical orientation, and the second wall (106D) is disposed in between the first wall (106B) and third wall (106F) of the current collector lid (106). The second wall (106D) of the current collector lid (106) is engaged with the first wall (104A) of the insulator (104). The second wall interconnecting section (106E) of the current collector lid (106) is adapted to extend from a bottom end of the second wall (106D) along its circumference. The second wall interconnecting section (106E) of the current collector lid (106) is positioned on a third plane (P3) (as shown in fig. 7) which is below and spaced apart from the first plane (P1) on which the base (106) is positioned thereon. The second wall interconnecting section (106E) of the current collector lid (106) is engaged with the wall interconnecting section (104B) of the insulator (104). The second wall interconnecting section (106E) of the current collector lid (106) defines an arcuate section or a non-linear section. However, it is also within the scope of the invention to provide the second wall interconnecting section (106E) in any other shape or profile without otherwise deterring the intended function of the second wall interconnecting section (106E) of the current collector lid (106) as can be deduced from the description and corresponding drawings.
[0047] The third wall (106F) of the current collector lid (106) is adapted to upwardly extend from the second wall interconnecting section (106E) along its circumference in a direction towards the flange (104D) of the insulator (104). The third wall (106F) of the current collector lid (106) is an outer circular wall which is positioned in a vertical orientation. Further, the third wall (106F) of the current collector lid (106) is engaged with corresponding portion of the second wall (104C) of the insulator (104). In an embodiment, the second wall (106D), the second wall interconnecting section (106E) and the second wall (106F) of the current collector lid (106) defines a U shape configuration which extends along its circumference before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102). Further, in an embodiment, the U shape configuration of the current collector lid (106) is adapted to facilitate locating and crimping of the insulator (104) and the current collector lid (106) with the lid holding portion (102B) of the cylindrical can (102). Furthermore, in an embodiment, the U shape configuration of the current collector lid (106) is adapted to facilitate better sealability of the current collector lid (106) with the cylindrical can (102) when the current collector lid (106) is crimped with the cylindrical can (102) via the insulator (104). The current collector lid (106) is manufactured by sheet metal stamping process thereby reducing the manufacturing cost of the cylindrical battery cell (10).
[0048] In an embodiment, current collector lid (106) is configured to have uniform thickness along its entirety. For example, each of the base (106A), the first wall (106B), the first wall interconnecting section (106C), the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) of the current collector lid (106) are configured to have uniform thickness. In an embodiment, the current collector lid (106) is made of 20% nickel and 80% clad copper material in which the nickel material is configured to form a top layer of the current collector lid (106), and the clad copper is configured to form a bottom layer of the current collector lid (106). The nickel layer (top layer) of the current collector lid (106) is exposed to outside, and the clad copper layer (bottom layer) is facing in a direction towards the current collector disc (200). Before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102), the current collector lid (106) has the dimensional values as follows. In an embodiment, a thickness (T3) (as shown in fig. 7) of the current collector lid (106) is 0.8 mm in which a thickness of the nickel material (top layer) is in the range of 0.16 to 0.18 mm, and a thickness of the clad copper (bottom layer) is in the range of 0.64 to 0.66 mm. In another embodiment, the thickness (T3) of the current collector lid (106) is in the range of 0.5 to 1 mm. In an embodiment, a distance (S2) (as shown in fig. 7) from the second wall (106D) to the third wall (106F) of the current collector lid (106) is in the range of 1.80 to 1.85 mm. In another embodiment, the distance (S2) from the second wall (106D) to the third wall (106F) of the current collector lid (106) is in the range of 1.5 to 2 mm. S2 is the locating space (106R) which is defined between the second wall (106D) and the third wall (106F) of the current collector lid (106). An outer diameter (C1) (as shown in fig. 7) of the first wall (106B) of the current collector lid (106) is in the range of 11.1 mm to 11.3 mm. Further, an outer diameter (C2) (as shown in fig. 7) of the first wall interconnecting section (106C) of the current collector lid (106) is 22.6 mm or 22.7 mm. In another example, the outer diameter (C2) of the first wall interconnecting section (106C) of the current collector lid (106) is in the range of 20 to 25 mm. An outer diameter (C3) (as shown in fig. 7) of the second wall (106D) of the current collector lid (106) is in the range of 25.8 mm to 25.9 mm. An outer diameter (C4) (as shown in fig. 7) of the third wall (106F) of the current collector lid (106) is 31±0.1 mm. In another example, the outer diameter (C4) of the third wall (106F) of the current collector lid (106) is in the range of 24 to 34 mm. A height (HC) (as shown in fig. 7) of the third wall (106F) of the current collector lid (106) is 5 mm. In another example, the height (HC) of the third wall (106F) of the current collector lid (106) is in the range of 3 to 7 mm. A distance (D1) (as shown in fig. 7) from a bottom end of the second wall (106D) to the top surface (106T) of the first wall interconnecting section (106C) of the current collector lid (106) is 6.6 mm or 6.7 mm. In another example, the distance (D1) from the bottom end of the second wall (106D) to the top surface (106T) of the first wall interconnecting section (106C) of the current collector lid (106) is in the range of 4 to 8 mm. A height (H3) (as shown in fig. 7) of the current collector lid (106) is in the range of 8.2 to 8.5 mm.
[0049] Fig. 8 depicts another sectional view of the cylindrical can assembly (100) before crimping the insulator (104) and the current collector lid (106) against the cylindrical can (102), according to embodiments as disclosed herein. Before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102), the cylindrical can assembly (100) has the dimensional values as follows. The outer diameter (C4) of the third wall (106F) of the current collector lid (106) is 31±0.1 mm. An inner diameter (B4) of the first wall (104A) of the insulator (104) is 26.4±0.1 mm. A distance (D2) from a bottom surface (104DS) (as shown in figs. 4 and 8) of the flange (104D) of the insulator (104) to a bottom end of the flange (102BF) of the cylindrical can (102) is 5.4±0.1 mm. Further, a distance (D3) from the top surface (102T) of the lid holding portion (102B) of the cylindrical can (102) to the bottom end of the flange (102BF) of the cylindrical can (102) is 6.6±0.1 mm. A distance (D4) from the top surface (106T) (top end) of the current collector lid (106) to a bottom end of the current collector lid (106) is in the range of 8.2 mm to 8.5 mm. Further, in an embodiment, the cylindrical can assembly (100) is configured to have the top flushed surface in which the top surface (102T) of the lid holding portion (102B) of the cylindrical can (102), the top surface (104T) of the insulator (104) and the top surface (106T) of the current collector lid (106) are co-planar to each other. Further, the cylindrical battery cell (10) is configured to have a bottom flushed surface in which a bottom surface of a main section of the bottom current collector lid (600) and a bottom surface of the closing pin (400) are co-planar to each other.
[0050] Fig. 9 depicts a sectional view of the cylindrical can assembly (100) when the insulator (104) and the current collector lid (106) is crimped with the cylindrical can (102), according to embodiments as disclosed herein. The cylindrical can assembly (100) is configured to have a multi-layered crimp configuration (100L) (as shown in fig. 4) thereby rigidly sealing and affixing (clamping/ crimping) the current collector lid (106) with the cylindrical can (102) via the insulator (104) when the insulator (104) and the current collector lid (106) is crimped (affixed) to the lid holding portion (102B) of the cylindrical can (102) via the flange (102BF) of the cylindrical can (102). The multi-layered crimp configuration (100L) of the cylindrical can assembly (100) includes at least six crimp layers having three crimp layers of insulator (104), one crimp layer of cylindrical can (102) and two crimp layers of the current collector lid (106). It is also within the scope of the invention to increase or decrease the number of crimp layers of the multi-layered crimp configuration (100L) of the cylindrical can assembly (100) in accordance with the design and configuration of the cylindrical battery cell (10). The flange (102BF) of the cylindrical can (102), and the first wall (104A), the wall interconnecting section (104B), the second wall (104C) and the flange (104D) of the insulator (104), and the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) of the current collector lid (106) are configured to be deformed (folded/ crimped) against the bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) to facilitate formation of the multi-layered crimp configuration (100L) thereby hermetically sealing and clamping (riveting) the current collector lid (106) against the cylindrical can (102) during a single stage pressing (crimping) operation or a multi-stage pressing (crimping) operation of the insulator (104) and the current collector lid (106) with the cylindrical can (102). The multi-layered crimp configuration (100L) of the cylindrical can assembly (100) is disposed inside the cylindrical can (102) in between the bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) and the current collector disc (200). A top end of the multi-layered crimp configuration (100L) of the cylindrical can assembly (100) is engaged with the bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) and a bottom end of the multi-layered crimp configuration (100L) of the cylindrical can assembly (100) is engaged with the current collector disc (200). The third wall (106F) of the current collector lid (106) is affixed (folded/ crimped) against the flange (104D) of the insulator (104) when the current collector lid (106) is crimped with the cylindrical can (102). The second wall interconnecting section (106E) of the current collector lid (106) is engaged or connected with the current collector lid (106). The bottom end of the current collector lid (106) is co-planar to the first plane (P1) on which the base (106A) is positioned thereon when the current collector lid (106) is crimped with the cylindrical can (102). The dimensional values of the cylindrical can assembly (100) after crimping the current collector lid (106) with the cylindrical can (102) are as follows. A distance (D5) from the bottom surface (104DS) of the flange (104D) of the insulator (104) to the bottom end of the current collector lid (106) is 3.4±0.1 mm. A distance (D6) from the top surface (106T) (top end) of the current collector lid (106) to the bottom end of the current collector lid (106) is 4.6±0.1 mm. A diameter (E1) of the third wall (106F) at its bottom end of the current collector lid (106) is 30±0.1 mm. A diameter (E2) of flange (102BF) at its bottom end of the cylindrical can (102) is 34±0.1 mm. A diameter (E3) of the current collector lid (106) at its outer circumference is 37.4±0.1 mm.
[0051] The technical advantages of the cylindrical can assembly (100) of the cylindrical battery cell (10) are as follows. The cylindrical can assembly (100) with multi-layered crimp configuration (100L) ensures rigid sealability between the cylindrical can (102) and the current collector lid (106) to restrict leakage of electrolyte from the cylindrical battery cell (10) thereby enhancing safety and lifetime of the cylindrical battery cell (10). Easily locate and crimp the current collector lid (106) with the cylindrical can (102) of the cylindrical can assembly (100). The current collector lid (106) is configured to act both as the corresponding current collector and the corresponding electrode terminal of the cylindrical battery cell (10) at the same time. The cylindrical can assembly (100) achieves hermetic sealing at the interface between the current collector lid (106) and the cylindrical can (102) of the cylindrical battery cell (10). The cylindrical can assembly (100) achieves top flushed surface for the cylindrical battery cell (10). Improves the ease of wire bonding during busbar welding with respect to the cylindrical battery cell (10). The cylindrical can assembly (100) with the top flushed surface consumes less packaging space for crimping of the current collector lid (106) with the cylindrical can (102) thereby increasing the space inside the cylindrical battery cell (10) for improving the cell volume energy density. Enhance tight fitting and sealing of the current collector lid (106) with the cylindrical can (102) via the insulator (104) thereby providing hermetic contact of the current collector lid (106) with the cylindrical can (102) via the insulator (102). Provides a secure mechanical connection between the cylindrical can (102), the insulator (104) and the current collector lid (106) during long time use, and repeated temperature and pressure fluctuations inside the cylindrical battery cell (10). Positive fitting of the current collector lid (106) with the cylindrical can (102) via the insulator (104). The sheet metal current collector lid (106) with uniform thickness achieves better electrical conductivity and thermal performance during operation of one of a lithium iron phosphate (LFP) based cylindrical battery cell and a lithium-nickel-manganese-cobalt-Oxide (NMC) based cylindrical battery cell. Increased contact surface between the current collector lid (106) and the current collector disc (200) of the cylindrical battery cell (10). The sheet metal current collector lid (106) reduces the manufacturing costs of the cylindrical battery cell (10). Reduce the number of insulators used in the cylindrical battery cell (10) thereby reducing the costs of the cylindrical battery cell (10). Prevent entry of contaminants into the cylindrical battery cell (10). The cylindrical can assembly (100) is reliable and is easy to manufacture.
[0052] The foregoing description of the specific embodiments will 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 embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the spirit and scope of the embodiments as described herein.
, Claims:We claim:
1. A cylindrical can assembly (100) for a cylindrical battery cell (10), the cylindrical can assembly (100) comprising:
a cylindrical can (102) having a cylindrical body (102A) and a lid holding portion (102B) provided co-axial at a corresponding end of the cylindrical body (102A), wherein the lid holding portion (102B) includes a flange (102BF);
an insulator (104) adapted to be crimped with the flange (102BF) of the cylindrical can (102); and
a current collector lid (106) adapted to be crimped with the flange (102BF) of the cylindrical can (102) via the insulator (104),
wherein
the insulator (104) is adapted to insulate the current collector lid (106) from the cylindrical can (102); and
the flange (102BF) of the cylindrical can (102), a portion of the insulator (104) and a portion of the current collector lid (106) are configured to deform to facilitate formation of a multi-layered crimp configuration (100L) adapted for hermetically sealing and clamping the current collector lid (106) with respect to the cylindrical can (102) when the insulator (104) and the current collector lid (106) are crimped with the cylindrical can (102).
2. The cylindrical can assembly (100) as claimed in claim 1, wherein the multi-layered crimp configuration (100L) of the cylindrical can assembly (100) is located inside the cylindrical body (102A) and below a bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102); and
the current collector lid (106) is configured to act both as a corresponding current collector and a corresponding electrode terminal of the cylindrical battery cell (10) at the same time.

3. The cylindrical can assembly (100) as claimed in claim 1, wherein lid holding portion (102B) of the cylindrical can (102) includes a central opening (102BP);
the insulator (104) includes a central opening (104P) positioned co-axial to the central opening (102BP) of the cylindrical can (102) when a corresponding portion of the insulator (104) is inserted into the central opening (102BP) of the cylindrical can (102) from an inner side of the cylindrical can (102);
the current collector lid (106) is adapted to close the central opening (104P) of the insulator (104) and the central opening (102BP) of the cylindrical can (102) when a corresponding portion of the current collector lid (106) is inserted into the central opening (104P) of the insulator (104) from an inner side of the cylindrical can (102); and
the flange (102BF) of the lid holding portion (102B) of the cylindrical can (102) is configured to extend from the lid holding portion (102B) along a circumference of the central opening (102BP) in a direction towards the insulator (104).
4. The cylindrical can assembly (100) as claimed in claim 3, wherein the flange (102BF) of the cylindrical can (102) is adapted to facilitate locating and crimping of the insulator (104) and the current collector lid (106) with the cylindrical can (102); and
the insulator (200) is configured to seal an interface between the cylindrical can (102) and the current collector lid (104) along the circumference of the central opening (102BP) of the cylindrical can (102).
5. The cylindrical can assembly (100) as claimed in claim 4, wherein the insulator (104) includes:
a first wall (104A) adapted to be received by the central opening (102BP) of the cylindrical can (102);
a wall interconnecting section (104B) outwardly extending from a bottom end of the first wall (104A) along its circumference;
a second wall (104C) upwardly extending from the wall interconnecting section (104B) along its circumference, wherein the second wall (104C) is positioned parallel and spaced at a predefined distance from the first wall (104A); and
a flange (104D) outwardly extending from a top end of the second wall (104C) along its circumference in a direction towards the cylindrical body (102A) of the cylindrical can (102),
wherein
the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) defines a can flange receiving portion (104R) adapted to receive the flange (102BF) of the cylindrical can (102) therein such that the first wall (104A) and the second wall (104C) are engaged with corresponding portion of the flange (102BF) of the cylindrical can (102) when the first wall (104A) of the insulator (104) is inserted into the central opening (102BP) of the cylindrical can (102) from an inner side of the cylindrical can (102);
the first wall (104A) defines the central opening (104P) extending therethrough; and
the flange (104D) is engaged with a bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) to cover the bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) thereby insulating the current collector lid (106) from the cylindrical can (102).
6. The cylindrical can assembly (100) as claimed in claim 5, wherein the current collector lid (106) includes:
a base (106A);
a first wall (106B) adapted to upwardly extend from the base (106A) along its circumference;
a first wall interconnecting section (106C) adapted to outwardly extend from a top end of the first wall (106B) along its circumference;
a second wall (106D) downwardly extending from the first wall interconnecting section (106C) along its circumference, wherein the second wall (106D) is adapted to be received by the central opening (104P) of the insulator (104);
a second wall interconnecting section (106E) outwardly extending from a bottom end of the second wall (106D) along its circumference; and
a third wall (106F) upwardly extending from the second wall interconnecting section (106E) along its circumference in a direction towards the flange (104D) of the insulator (104), wherein the third wall (106F) is positioned parallel and spaced at a predefined distance from the second wall (106D),
wherein
the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) of the current collector lid (106) defines an insulating wall receiving portion (106R) adapted to receive the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) therein such that the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) are engaged with the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) respectively when the second wall (106D) of the current collector lid (106) is inserted into the central opening (104P) of the insulator (104) from the inner side of the cylindrical can (102).
7. The cylindrical can assembly (100) as claimed in claim 6, wherein the flange (102BF) of the cylindrical can (102), and the first wall (104A), the wall interconnecting section (104B), the second wall (104C) and the flange (104D) of the insulator (104), and the second wall (106D), the second wall interconnecting section (106E) and the third wall (106F) of the current collector lid (106) are configured to be deformed against the lid holding portion (102B) of the cylindrical can (102) to facilitate formation of the multi-layered crimp configuration (100L) thereby hermetically sealing and clamping (riveting) the current collector lid (106) against the cylindrical can (102) via the insulator (104) when the insulator (104) and the current collector lid (106) are crimped with the cylindrical can (102).

8. The cylindrical can assembly (100) as claimed in claim 7, wherein the insulator (104) includes at least one sealing lip (104E) extending from a top end of the first wall (104A) along its inner circumference in a direction towards the first wall interconnecting section (106C) of the current collector lid (106),
wherein
the sealing lip (104E) of the insulator (104) is adapted to be engaged with the first wall interconnecting section (106C) of the current collector lid (106) thereby hermetically sealing the interface between the insulator (104) and the current collector lid (106);
the multi-layered crimp configuration (100L) of the cylindrical can assembly (100) is disposed inside the cylindrical can (102) in between the bottom surface (102BS) of the lid holding portion (102B) of the cylindrical can (102) and a current collector disc (200) of the cylindrical battery cell (10);
each of the base (106A), the first wall (106B) and the first wall interconnecting section (106C) of the current collector lid (106) are adapted to close the central opening (104P) of the insulator (104) when the second wall (106D) of the current collector lid (106) is inserted into the central opening (104P) of the insulator (104); and
an outer surface of each of the base (106A), the first wall (106B) and the first wall interconnecting section (106C) of the current collector lid (106) are exposed to outside.
9. The cylindrical can assembly (100) as claimed in claim 8, wherein the first wall (104A), the wall interconnecting section (104B) and the second wall (104C) of the insulator (104) defines a U shape configuration which extends along its circumference before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102); and
the second wall (106D), the second wall interconnecting section (106E) and the second wall (106F) of the current collector lid (106) defines a U shape configuration which extends along its circumference before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102).

10. The cylindrical can assembly (100) as claimed in claim 9, wherein the base (106A) of the current collector lid (106) is positioned on a first plane (P1) in a horizontal orientation;
the base (106A) and the first wall (106B) of the current collector lid (106) defines a space (106S) therebetween;
the first wall interconnecting section (106C) of the current collector lid (106) is positioned on a second plane (P2) that is positioned above and spaced apart from the first plane (P1) onto which the base (106A) of the current collector lid (106) is positioned thereon;
the base (106A) of the current collector lid (106) is engaged with a current collector disc (200) thereby connecting the current collector lid (106) with a corresponding electrode tab of a battery cell jelly roll (300) via the current collector disc (200);
the second wall (106D) of the current collector lid (106) is positioned parallel and spaced at a predefined distance from the first wall (106B) of the current collector lid (106); and
the second wall interconnecting section (106E) of the current collector lid (106) is positioned on a third plane (P3) which is below and spaced apart from the first plane (P1) on which the base (106) is positioned thereon.
11. The cylindrical can assembly (100) as claimed in claim 10, wherein a distance (D4) from a top surface (106T) (top end) of the current collector lid (106) to a bottom end of the current collector lid (106) is in the range of 8.2 mm to 8.5 mm before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102);
a distance (D6) from the top surface (106T) (top end) of the current collector lid (106) to the bottom end of the current collector lid (106) is in the range of 4.5 mm to 4.7 mm when the insulator (104) and the current collector lid (106) are crimped with the cylindrical can (102);
an outer diameter (C4) of the third wall (106F) of the current collector lid (106) 31±0.1 mm before crimping the insulator (104) and the current collector lid (106) with the cylindrical can (102);
a diameter (E3) of the current collector lid (106) at its outer circumference is 37.4±0.1 mm when the insulator (104) and the current collector lid (106) are crimped with the cylindrical can (102);
the cylindrical can (102) is configured to have uniform thickness along its entirety;
the insulator (104) is configured to have uniform thickness along its entirety; and
the current collector lid (106) is configured to have uniform thickness along its entirety.
12. The cylindrical can assembly (100) as claimed in claim 7, wherein the third wall (106F) of the current collector lid (106) is affixed (folded/ crimped) against the flange (104D) of the insulator (104) when the current collector lid (106) is crimped with the cylindrical can (102);
the bottom end of the current collector lid (106) is co-planar to the first plane (P1) on which the base (106A) is positioned thereon when the current collector lid (106) is crimped with the cylindrical can (102);
a thickness (T1) of the cylindrical can (102) is in the range of 0.4 to 0.8 mm;
a thickness (T2) of the insulator (104) is in the range of 0.4 to 0.8 mm;
a thickness (T3) of the current collector lid (106) is in the range of 0.5 to 1 mm;
the current collector lid (106) is made of 20% nickel and 80% clad copper material in which the nickel material is configured to form a top layer of the current collector lid (106), and the clad copper is configured to form a bottom layer of the current collector lid (106); and
the nickel layer (top layer) of the current collector lid (106) is exposed to outside, and the clad copper layer (bottom layer) is facing in a direction towards a current collector disc (200) of the cylindrical battery cell (10).