Battery cell

Abstract

The present invention relates to a battery cell, and addresses the technical problem of providing a battery cell including an insulating mechanism for preventing deformation of a central portion of an electrode assembly wound in a jelly roll shape. To this end, the present invention provides a battery cell comprising: a cell case; a jelly roll which is formed by winding an electrode assembly and is accommodated in the cell case and has a hollow space that extends in the longitudinal direction; and insulating mechanisms including insulating disks which overlap the jelly roll, and deformation prevention parts which protrude from the insulating disks so as to be fitted into the hollow space.

Description

battery cell

[0001] The present disclosure relates to a battery cell.

[0002]

[0003] In general, as the demand for portable electronic products such as laptops, video cameras, and mobile phones rapidly increases and the commercialization of robots, electric vehicles, etc. becomes more widespread, research on high-performance secondary batteries capable of repeated charging and discharging is actively being conducted.

[0004] Among secondary batteries, a cylindrical battery cell can house an electrode assembly wound in a jelly roll shape within a cylindrical case. The electrode assembly includes a plate and a separator interposed between the plates.

[0005] As the plates of a cylindrical battery cell repeatedly expand and contract during charging and discharging, the core (i.e., the central portion) of the jellyroll-shaped electrode assembly can become deformed. Deformation of the central portion of the jellyroll can result in a short circuit or voltage drop.

[0006]

[0007] The purpose of the present invention is to provide a battery cell including an insulating device that prevents deformation of the central portion of an electrode assembly wound in the form of a jelly roll.

[0008] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0009]

[0010] According to one embodiment of the present invention for solving the above technical problem, a battery cell comprises: a cell case; a jelly roll formed by winding an electrode assembly and housed inside the cell case, wherein a hollow portion extending in the longitudinal direction is formed; and an insulating device including an insulating plate portion overlapping the jelly roll and a deformation prevention portion protruding from the insulating plate portion so as to be fitted into the hollow portion of the jelly roll.

[0011] The above insulating device may be placed at one point among the outer side of one side and the outer side of the other side along the length direction of the jelly roll.

[0012] The above insulating device is provided in pairs, and the pair of insulating devices can be arranged one on the outside of one side and one on the outside of the other side along the length direction of the jelly roll.

[0013] The length of the above deformation prevention part may be 1 / 10 to 1 / 3 of the length of the jelly roll.

[0014] The above deformation prevention member may include a tube extending in the longitudinal direction of the jelly roll.

[0015] The diameter of the above-mentioned pipe part can be formed to become smaller as it gets farther away from the insulating plate part.

[0016] The insulating plate portion may have a pipe penetration hole formed therein through which the pipe portion passes, and the deformation prevention portion may further include a flange portion that extends in the radial direction so as to be bent from the pipe portion.

[0017] A flange mounting groove to which the flange portion is fixed can be formed around the above-mentioned pipe penetration hole.

[0018] The above insulating plate portion may include a through hole aligned with the hollow of the jelly roll, and the deformation prevention portion may include a plurality of protruding pieces protruding from the inner surface of the through hole of the insulating plate portion to be inserted into the hollow.

[0019] A plurality of the above protrusions can be arranged at equal intervals based on the center of the through hole of the above insulating plate portion.

[0020] A plurality of the above protrusions can be arranged symmetrically with respect to the center of the through hole of the above insulating plate portion.

[0021] The plurality of protruding pieces are formed integrally with the insulating plate portion, and the through-holes of the insulating plate portion can be formed by pressing the plurality of protruding pieces so that they protrude from the insulating plate portion.

[0022] The plurality of protruding pieces can be bent along a folding line provided on the insulating plate.

[0023] The above folding line may have a circular or polygonal shape centered on the center of the hole of the above insulating plate portion.

[0024] The above insulating plate portion may have a protruding boundary line extending radially from the center of the hole in the above insulating plate portion and touching the fold line.

[0025] When the plurality of protrusions spread out parallel to the insulating plate portion are pressed in a direction parallel to the thickness of the insulating plate portion, the plurality of protrusions spread out along the boundary line of the protrusions, and a through hole in the insulating plate portion can be formed.

[0026] The above insulating device may further include a protrusion holder that is fitted into the hole of the above insulating plate and contacts the plurality of protrusions.

[0027] The planar shape of the above protruding holder may be a shape corresponding to the shape of the above folding line.

[0028] The above deformation prevention part may further include a protrusion stopper that protrudes from the protrusion piece in a stepwise manner to block the protrusion piece holder.

[0029] The above protruding piece stopper includes a first protruding piece stopper and a second protruding piece stopper spaced apart at a distance corresponding to the thickness of the protruding piece holder, and an outer peripheral portion of the protruding piece holder can be fitted into a gap between the first protruding piece stopper and the second protruding piece stopper.

[0030]

[0031] According to an embodiment of the present invention, the deformation prevention part of the insulating device is positioned so as to face and contact the hollow inner surface of the jelly roll formed of the electrode assembly. This prevents deformation of the jelly roll, such as folding or bending of the electrode plates in the central portion of the jelly roll, prevents accidents such as short circuits and voltage drops in the battery cell, and enhances the durability of the battery cell.

[0032] According to an embodiment of the present invention, the deformation prevention part of the insulating device is positioned only at the ends along the length of the jelly roll. This allows the electrolyte to be rapidly impregnated throughout the entire area of ​​the jelly roll. Consequently, the productivity of battery cell manufacturing can be improved, and the energy efficiency during battery cell charging and discharging can be enhanced.

[0033] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects that are not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0034]

[0035] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0036] FIG. 1 is a perspective view of a battery cell according to embodiments of the present invention.

[0037] FIG. 2 is a cross-sectional view schematically showing the interior of a battery cell according to the first embodiment of the present invention.

[0038] Figure 3 is an exploded perspective view showing the jelly roll, upper insulation device, and lower insulation device stored inside the battery cell of Figure 2 from above.

[0039] Figure 4 is an exploded perspective view of the jelly roll, upper insulating device, and lower insulating device of Figure 3, viewed from below.

[0040] Fig. 5 is an enlarged cross-sectional view showing the deformation prevention part of the upper insulating device of Fig. 3 inserted into the hollow part of the jelly roll.

[0041] Fig. 6 is an enlarged cross-sectional view showing the deformation prevention part of the lower insulating device of Fig. 4 inserted into the hollow part of the jelly roll.

[0042] FIG. 7 is an exploded perspective view illustrating a jelly roll, an upper insulating device, and a lower insulating device housed inside a battery cell according to a second embodiment of the present invention, viewed from above.

[0043] Figure 8 is an exploded perspective view of the jelly roll, upper insulating device, and lower insulating device of Figure 7, viewed from below.

[0044] Fig. 9 is an enlarged cross-sectional view showing the deformation prevention part of the upper insulating device of Fig. 7 inserted into the hollow part of the jelly roll.

[0045] Fig. 10 is an enlarged cross-sectional view showing the deformation prevention part of the lower insulating device of Fig. 7 inserted into the hollow part of the jelly roll.

[0046] Fig. 11 is a plan view showing the upper insulating plate portion or the lower insulating plate portion of Fig. 7 and a plurality of protruding pieces formed integrally therewith, and is a plan view showing the appearance of the plurality of protruding pieces before they are bent.

[0047] Fig. 12 is a cross-sectional view taken along line XII-XII of Fig. 11.

[0048] Fig. 13 is a cross-sectional view showing a modified example of the upper insulating device shown in Fig. 9.

[0049] Fig. 14 is a cross-sectional view showing a modified example of the lower insulating device shown in Fig. 10.

[0050]

[0051] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as limited to their typical or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of a term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as substitutes for them at the time of filing this application.

[0052] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements and / or groups thereof.

[0053] Additionally, to facilitate understanding of the invention, the attached drawings are not drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0054] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given region may imply uniformity on average.

[0055] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0056] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0057] Any configuration being placed “on top (or bottom)” of a component or “on top (or bottom)” of a component may mean not only that any configuration is placed in contact with the top (or bottom) of the component, but also that other configurations may be interposed between the component and any configuration placed on (or under) the component.

[0058] Additionally, when a component is described as being “on,” “connected to,” or “coupled to” another component, it should be understood that the components may be directly connected or coupled to one another, but that other components may also be “interposed” between the components, or that each component may be “connected,” “coupled,” or “connected” through other components.

[0059] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, the use of "may" when describing embodiments of the present disclosure refers to "one or more embodiments of the present disclosure." Expressions such as "one or more" and "one or more" preceding a list of elements modify the list as a whole and do not modify individual elements in the list.

[0060] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated, and when reference is made to “C to D,” this means C or more and D or less, unless otherwise stated.

[0061] When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group A, B, and C," or "at least one selected from A, B, and C," are used to specify a list of elements A, B, and C, the phrases can refer to any suitable combination.

[0062] The term "use" may be considered synonymous with the term "utilize." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than degrees, and are intended to take into account inherent variations in measured or calculated values ​​that would be recognized by those skilled in the art.

[0063] Although terms such as first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could also be termed a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0064] For ease of description, spatially relative terms such as "beneath," "below," "lower," "above," "upper," and the like may be used herein to describe the relationship of one element or feature to another element(s) or feature(s) as depicted in the drawings. It will be understood that spatially relative positions encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the drawings is turned over, an element described as "beneath" or "lower" another element would be understood to be "above" or "upper" the other element. Thus, the term "beneath" can encompass both the above and below orientations.

[0065] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to be limiting of the present disclosure.

[0066] In exemplary embodiments of [cylindrical / square / pouch] batteries according to embodiments of the present disclosure, one of the square / pouch / circular batteries is selected and the selected battery is described as having a general structure, and in the case of a generally applicable technology, the general structure of the square / pouch / circular battery is described.

[0067]

[0068] FIG. 1 is a perspective view of a battery cell according to embodiments of the present invention, FIG. 2 is a longitudinal cross-sectional view schematically showing the inside of a battery cell according to a first embodiment of the present invention, FIG. 3 is an exploded perspective view showing a jelly roll, an upper insulating device, and a lower insulating device housed inside the battery cell of FIG. 2 as viewed from above, FIG. 4 is an exploded perspective view showing a jelly roll, an upper insulating device, and a lower insulating device as viewed from below, FIG. 5 is an enlarged cross-sectional view showing a deformation prevention part of the upper insulating device of FIG. 3 inserted into a hollow part of the jelly roll, and FIG. 6 is an enlarged cross-sectional view showing a deformation prevention part of the lower insulating device of FIG. 4 inserted into a hollow part of the jelly roll.

[0069] Referring to FIGS. 1 to 6, a battery cell (10) according to one embodiment of the present invention may include a cell case (11), a jelly roll (20), and a pair of insulating devices (100A, 100B). Referring to FIGS. 1 and 2, the battery cell (10) may include a cell case (11), a jelly roll (20), and a cap assembly (30).

[0070] The cell case (11) may include a roughly circular bottom portion (12) and a side wall portion (13) extending upward from the bottom portion (12) by a certain length. The cell case (11) may be made of steel, a steel alloy, nickel-plated steel, nickel-plated steel alloy, aluminum, or an aluminum alloy.

[0071] During the manufacturing process of the battery cell (10), the upper portion of the cell case (11) may be opened. During the assembly process of the battery cell (10), a jelly roll (20) formed by winding the electrode assembly may be inserted into the cell case (11). Thereafter, an electrolyte may be injected into the cell case (11).

[0072] A beading part (14) that is sunken in the direction of the central axis of the cap assembly (30) to prevent the cap assembly (30) from being detached to the outside may be formed on the upper side of the cell case (11). The beading part (14) may be positioned at the lower part of the cap assembly (30). A crimping part (15) that is bent to wrap around the edge of the cap assembly (30) may be formed on the upper part of the beading part (14).

[0073] A jelly roll (20) formed by winding an electrode assembly can be accommodated inside a cell case (11). The electrode assembly can function as a unit structure that performs charging and discharging operations of power in a battery cell (10).

[0074] The electrode assembly may include a negative electrode plate coated with a negative electrode active material (e.g., graphite, carbon, etc.), a positive electrode plate coated with a positive electrode active material (e.g., transition metal oxide (LiCoO2, LiNiO2, LiMn2O4, etc.)), and a separator positioned between the negative electrode plate and the positive electrode plate to prevent short circuit and only allow movement of lithium ions. The negative electrode plate, the positive electrode plate, and the separator may be wound in a generally cylindrical shape. In some examples, the negative electrode plate may be a copper (Cu) foil, the positive electrode plate may be an aluminum (Al) foil, and the separator may be polyethylene (PE) or polypropylene (PP).

[0075] A negative electrode tab (53) may be welded to the negative electrode plate. The negative electrode tab (53) may protrude and extend to the lower portion of the electrode assembly by a certain length. A positive electrode tab (51) may be welded to the positive electrode plate. The positive electrode tab (51) may protrude and extend to the upper portion of the electrode assembly by a certain length. The negative electrode tab (53) may be copper (Cu) or nickel (Ni), and the positive electrode tab (51) may be aluminum (Al).

[0076] The negative tab (53) can be welded to the bottom (12) of the cell case (11). Therefore, the cell case (11) can operate as a negative electrode. In some examples, the negative tab (53) can be ultrasonically or laser welded to the bottom (12) of the cell case (11). Of course, conversely, the positive tab (51) can be welded to the bottom (12) of the cell case (11), in which case the cell case (11) can operate as a positive electrode.

[0077] The cap assembly (30) can seal the opening of the cell case (11) and protect the electrode assembly from the external environment. If the internal pressure of the cell case (11) rises above the reference pressure due to thermal runaway or ignition of the battery cell (10), the cap assembly (30) can break, releasing the internal gas of the cell case (11) to the outside. In some examples, the cap assembly (30) can also function as a positive terminal.

[0078] The cap assembly (30) may include a cap up (31), a vent plate (36), and a cap down (37). The cap up (31) may serve as a terminal electrically connected to an external device. In some examples, the cap up (31) may serve as a positive terminal.

[0079] A vent hole (VT) may be formed in the cap up (31). The vent hole (VT) may serve to discharge internal gas to the outside when an abnormal internal pressure occurs within the cell case (11) due to overcharging or other reasons. The cap up (31) may be manufactured from aluminum or an aluminum alloy.

[0080] For example, the cap up (31) may include an inner body (32), an outer body (33), and a bridge (34).

[0081] The inner body (32) can form the central outer appearance of the cap up (31). For example, the inner body (32) can be formed to have a roughly circular shape. The inner body (32) can be arranged so that its central axis is aligned with the central axis (CX) of the cell case (11).

[0082] The outer body (33) can form the outer edge of the cap up (31). For example, the outer body (33) can be formed to have a roughly hollow ring shape. The diameter of the outer body (33) can be formed to be larger than the diameter of the inner body (32). The outer body (33) can be arranged coaxially with the inner body (32). That is, the central axis of the outer body (33) can be arranged to coincide with the central axis (CX) of the inner body (32) and the cell case (11).

[0083] The inner body (32) and the outer body (33) may be arranged so that there is a difference in height between them. For example, the outer body (33) may be arranged on the lower side of the inner body (32). Alternatively, the inner body (32) and the outer body (33) may also be arranged on the same plane.

[0084] A bridge (34) is arranged between the inner body (32) and the outer body (33) and can support the inner body (32) with respect to the outer body (33). The bridge (34) can be formed to have a rod shape with both ends connected to the outer surface of the inner body (32) and the inner surface of the outer body (33), respectively. A plurality of bridges (34) can be provided. A plurality of bridges (34) can be arranged at set intervals along a circumference centered on the central axis (CX) of the cell case (11). The intervals between adjacent bridges (34) can be the same.

[0085] The vent hole (VT) may be formed to have the shape of a hole formed by penetrating the cap up (31). For example, the vent hole (VT) may be formed to have the shape of a hole penetrating the area between the inner body (32) and the outer body (33). The vent hole (VT) may be provided in multiple numbers. The multiple vent holes (VT) may be individually arranged between adjacent bridges (34). For example, the number of vent holes (VT) is not limited to that illustrated in FIG. 1, and the design may be changed to a variety of numbers.

[0086] The vent plate (36) may be positioned at the bottom of the cap up (31). The vent plate (36) may be in close contact with, in contact with, coupled with, or connected to the bottom of the cap up (31). For example, the vent plate (36) may be in close contact with, in contact with, coupled with, or connected to the center portion protruding upward from the cap up (31), that is, the edge of the cap up (31) excluding the inner body (32), that is, the outer body (33). The end of the vent plate (36) may be curvedly extended to surround the end of the outer body (33). The vent plate (36) may be made of aluminum or an aluminum alloy.

[0087] The vent plate (36) may include a notch (36a). The notch (36a) may be formed concavely to a certain depth from the outer surface of the vent plate (36).

[0088] As the internal pressure of the battery cell (10) rises above the reference pressure or the rupture pressure of the vent plate (36) due to thermal runaway or ignition of the battery cell (10), the notch (36a) is ruptured, and the exhaust generated inside the cell case (11) can sequentially pass through the notch (36a) and the vent hole (VT) and be discharged to the outside. Here, the exhaust discharged from the vent hole (VT) can include at least one of flame, gas, and smoke.

[0089] The cap down (37) may be positioned below the vent plate (36). The cap down (37) may be in close contact with, in contact with, connected to, or coupled to the vent plate (36). The cap down (37) may be electrically connected to the jelly roll (20) via the positive electrode tab (51). The cap down (37) may be electrically connected to the vent plate (36) and the cap up (31). The positive electrode tab (51) of the electrode assembly may be welded to the lower surface of the cap down (37). In some examples, the lower surface of the cap down (37) may be ultrasonically and / or laser welded to the positive electrode tab (51). In some examples, the cap down (37) may be made of aluminum or an aluminum alloy.

[0090] In some examples, when the battery cell (10) experiences thermal runaway or ignition, the vent plate (36) may be deformed by the internal pressure of the cell case (11), and the cap down (37) and the vent plate (36) may be electrically separated.

[0091] A first insulating member (38) may be installed between the vent plate (36) and the cap down (37). The first insulating member (38) may be positioned between the edge of the vent plate (36) and the edge of the cap down (37). The first insulating member (38) may serve to insulate between the cap down (37) and the vent plate (36) when the vent plate (36) is deformed by internal gas. In some examples, the first insulating member (38) may be formed of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or the like, but the material is not limited thereto.

[0092] A second insulating member (39) may be installed on the upper side of the cell case (11). The second insulating member (39) may be positioned between the end of the vent plate (36) surrounding the outer body (33) of the cap up (31) and the cell case (11). Both sides of the second insulating member (39) may be in close contact with the end of the vent plate (36) and the inner surface of the crimping portion (15) and the beading portion (14), respectively. The second insulating member (39) may serve to insulate between the case (210) and the cap assembly (30). The second insulating member (39) may be formed of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or the like, but the material is not limited thereto.

[0093] The jelly roll (20) can be formed by winding the electrode assembly around a winding axis (CX). The winding axis (CX) can be the same as the central axis (CX) of the battery cell (20). The jelly roll (20) can extend along the central axis (CX). A hollow space (25) can be formed in the jelly roll (20) extending along the central axis (CX) in its length direction.

[0094] A pair of insulating devices (100A, 100B) is provided. The pair of insulating devices (100A, 100B) is divided into an upper insulating device (100A) and a lower insulating device (100B). The pair of insulating devices (100A, 100B) can be arranged one on the outside of one side and one on the outside of the other side along the length direction of the jelly roll (20).

[0095] The upper insulating device (100A) and the lower insulating device (100B) are made of an insulating material and each include an insulating plate portion (101A, 101B) and a deformation prevention portion (120A, 120B). The insulating plate portions (101A, 101B) are approximately disk-shaped and made of an insulating material. The insulating plate portions (101A, 101B) overlap with the jelly roll (20).

[0096] The insulating plate portion (101A) of the upper insulating device (100A) may overlap with the jelly roll (20) to cover one end (21) of the jelly roll (20) facing the cap assembly (30), and the insulating plate portion (101B) of the lower insulating device (100B) may overlap with the jelly roll (20) to cover the other end (22) of the jelly roll (20) facing the bottom (12) of the cell case (11). The upper insulating device (100A), the jelly roll (20), and the lower insulating device (100B) may be arranged in a row along the central axis (CX).

[0097] Hereinafter, it is assumed that the cap assembly (30) is positioned above the bottom portion (12). Accordingly, one end portion (21) of the jelly roll (20) is referred to as the upper end, and the other end portion (22) of the jelly roll (20) is referred to as the lower end.

[0098] The deformation prevention portion (120A, 120B) is made of an insulating material and protrudes from the insulating plate portion (101A, 101B) so as to be fitted into the hollow portion (25) of the jelly roll (20). The deformation prevention portion (120A, 120B) may include a pipe portion (121A, 121B) and a flange portion (126A, 126B). The pipe portion (121A, 121B) has an annular cross-sectional shape and may extend in the longitudinal direction of the jelly roll (20), i.e., along the central axis (CX).

[0099] A pipe penetration hole (106A, 106B) through which a pipe part (121A, 121B) passes may be formed in the central portion of the insulating plate portion (101A, 101B). An electrode tab penetration hole (104A, 104B) through which an electrode tab (51, 53) (see FIG. 2) passes may be formed on the outside of the pipe penetration hole (106A, 106B) in the insulating plate portion (101A, 101B).

[0100] The positive electrode tab (51) can electrically connect the positive electrode plate and the cap down (37) of the cap assembly (30) across the electrode tab through-hole (104A) of the upper insulating plate portion (101A). The negative electrode tab (53) can electrically connect the negative electrode plate and the bottom portion (12) of the cell case (11) across the electrode tab through-hole (104B) of the lower insulating plate portion (101B).

[0101] The pipe part (121A) of the upper insulating device (100A) can be inserted into the entrance of the hollow space (25) open to the upper side of the jelly roll (20), and the pipe part (121B) of the lower insulating device (100B) can be inserted into the entrance of the hollow space (25) open to the lower side of the jelly roll (20).

[0102] The pipe portion (121A) of the upper insulating device (100A) is tapered so that the diameter (DP) becomes smaller as it moves away from the upper insulating plate portion (101A). Accordingly, when the pipe portion (121A) is inserted into the interior of the hollow (25), it can be inserted while sliding without damaging the inner surface (26) of the jelly roll (20) that defines the hollow (25).

[0103] Like the pipe part (121B) of the upper insulating device (100A), the pipe part (121B) of the lower insulating device (100B) is tapered so that its diameter becomes smaller as it moves away from the lower insulating plate part (101B). Accordingly, when the pipe part (121B) is inserted into the interior of the hollow (25), it can be inserted while sliding without damaging the inner surface (26) of the jelly roll (20) defining the hollow (25).

[0104] The tubes (121A, 121B) are positioned so close that they face and can come into contact with the inner surface (26) of the hollow portion (25) of the jelly roll (20). Therefore, when the battery cell (10) is charged or discharged, the electrode plates constituting the jelly roll (20) expand or contract, and the inner surface (26) of the jelly roll (20) can come into contact with the outer surface of the tubes (121A, 121B). Even when the battery cell (10) is not charged or discharged, the inner surface (26) of the jelly roll (20) can come into contact with the outer surface of the tubes (121A, 121B).

[0105] Due to this, deformation of the jelly roll (20), such as folding or bending of the electrode plate in the central portion of the jelly roll (20) including the inner side (26) of the jelly roll (20), accidents such as short circuit or voltage drop of the battery cell (10) are prevented, and the durability of the battery cell (10) can be improved.

[0106] The flange portions (126A, 126B) are bent from the pipe portions (121A, 121B) and extend in a radial direction of the central axis (CX). The flange portions (126A, 126B) may protrude annularly from the pipe portions (121A, 121B). In the case of the upper insulating device (100A), the flange portion (126A) extends radially from the upper end of the pipe portion (121A), and in the case of the lower insulating device (100B), the flange portion (126B) extends radially from the lower end of the pipe portion (121B).

[0107] The size of the diameter (DF) of the flange portion (126A, 126B) is larger than the size of the diameter (DP) of the pipe portion (121A, 121B). The pipe portion (121A, 121B) penetrates the pipe portion through-hole (106A, 106B) of the insulating plate portion (101A, 101B), but the flange portion (126A, 126B) does not penetrate the pipe portion through-hole (106A, 106B) and is supported by the insulating plate portion (101A, 101B).

[0108] A flange mounting groove (110A, 110B) may be formed around the pipe through hole (106A, 106B) in the insulating plate (101A, 101B). The flange mounting groove (110A, 110B) may be formed in an annular shape. In the case of the upper insulating device (100A), the flange mounting groove (110A) may be formed so as to be stepped on the upper surface of the insulating substrate (101A), and in the case of the lower insulating device (100B), the flange mounting groove (110B) may be formed so as to be stepped on the lower surface of the insulating substrate (101B).

[0109] The size of the inner diameter (DG) of the flange mounting groove (110A, 110B) may not be larger than the size of the diameter (DF) of the flange portion (126A, 126B). In other words, the size of the inner diameter (DG) of the flange mounting groove (110A, 110B) may be slightly smaller than or equal to the size of the diameter (DF) of the flange portion (126A, 126B). However, the size of the inner diameter (DG) of the flange mounting groove (110A, 110B) must not be so small that the flange portion (126A, 126B) cannot be seated in the flange mounting groove (110A, 110B).

[0110] With this configuration, the flange portion (126A, 126B) is fixed by being pressed into the flange portion mounting groove (110A, 110B) and the deformation prevention portion (120A, 120B) may not be separated from the insulating plate portion (101A, 101B) despite external impact.

[0111] The upper insulating device (100A) and the lower insulating device (100B) can be assembled by joining the deformation prevention part (121A, 121B) to the insulating plate part (101A, 101B) so that the pipe part (121A) passes through the pipe part through hole (106A, 106B) and the flange part (126A, 126B) is press-fitted and fixed into the flange part mounting groove (110A, 110B).

[0112] The jelly roll (20), the upper insulating device (100A), and the lower insulating device (100B) can be inserted and installed together into the inside of the cell case (11) in a state where the upper insulating device (100A) overlaps the upper part (21) of the jelly roll (20), and the lower insulating device (100B) overlaps the lower part (22) of the jelly roll (20).

[0113] However, the assembly sequence described above is merely an example, and unlike the example described above, the lower insulating device (100B), jelly roll (20), and upper insulating device (100A) may be inserted and installed inside the cell case (11) in the following order. In addition, in the case of the upper insulating device (100A), the insulating plate portion (101A) of the upper insulating device (100A) may be placed overlapping the upper portion (21) of the jelly roll (20) so that the hollow portion (25) of the jelly roll (20) and the pipe portion through-hole (106A) are aligned along the central axis (CX), and the deformation prevention portion (120A) may be joined to the insulating plate portion (101A) so that the pipe portion (121A) is fitted into the hollow portion (25).

[0114] An electrolyte can be injected so that the jelly roll (20) is impregnated into the inside of the cell case (11) while the jelly roll (20), the upper insulating device (100A), and the lower insulating device (100B) are housed inside the cell case (11). The electrolyte can penetrate into the inside of the jelly roll (20) not only through the outer surface of the jelly roll (20) but also through the inner surface (26) of the jelly roll (20). In other words, the electrolyte can flow into the inside of the hollow portion (25) through the tube portion (121A, 121B) and penetrate into the inside of the jelly roll (20) through the inner surface (26).

[0115] For example, the length (LD1) of the deformation prevention portion (120A, 120B) in the direction parallel to the central axis (CX) may be 1 / 10 to 1 / 3 of the length (LR1) of the jelly roll (20). Deformation of the inner surface (26) of the jelly roll (20) due to charging and discharging of the battery cell (10) is easily found at the upper portion (21) and the lower portion (22), but is hardly found at the middle portion between the upper portion (21) and the lower portion (22).

[0116] Therefore, if the length (LD1) of the deformation prevention part (120A, 120B) is greater than 1 / 3 of the length (LR1) of the jelly roll (20), the inner surface (26) of the hollow (25) is excessively covered by the deformation prevention part (120A, 120B), so that the deformation prevention effect of the jelly roll (20) by the deformation prevention part (120A, 120B) is not further improved, and the side effect of delaying the diffusion and impregnation speed of the electrolyte may increase.

[0117] Meanwhile, if the length (LD1) of the deformation prevention part (120A, 120B) is less than 1 / 10 of the length (LR1) of the jelly roll (20), the length (LD1) of the deformation prevention part (120A, 120B) is too short, and the effect of preventing deformation of the inner surface (26) of the jelly roll (20) at the upper part (21) and the lower part (22) may be reduced.

[0118] The insulating device (100A, 100B) described with reference to FIGS. 3 to 6 has deformation prevention members (120A, 120B) positioned only at the ends (21, 22) in the longitudinal direction of the jelly roll (20). This allows the electrolyte to be rapidly impregnated into the entire area of ​​the jelly roll (20). Accordingly, the manufacturing productivity of the battery cell (10) can be improved, and the energy efficiency during charging and discharging of the battery cell (10) can be improved.

[0119] FIG. 7 is an exploded perspective view illustrating a jelly roll, an upper insulating device, and a lower insulating device housed inside a battery cell according to a second embodiment of the present invention when viewed from above, FIG. 8 is an exploded perspective view illustrating a jelly roll, an upper insulating device, and a lower insulating device of FIG. 7 when viewed from below, FIG. 9 is an enlarged cross-sectional view illustrating a deformation prevention part of the upper insulating device of FIG. 7 inserted into a hollow part of the jelly roll, FIG. 10 is an enlarged cross-sectional view illustrating a deformation prevention part of the lower insulating device of FIG. 7 inserted into a hollow part of the jelly roll, FIG. 11 is a plan view illustrating an upper insulating plate part or a lower insulating plate part of FIG. 7 and a plurality of protrusions formed integrally therewith, and is a plan view illustrating a state before the plurality of protrusions are bent, and FIG. 12 is a cross-sectional view illustrating FIG. 11 cut along line XII-XII.

[0120] Referring to FIGS. 7 to 12, a pair of insulating devices (200A, 200B) may be provided. The pair of insulating devices (200A, 200B) is divided into an upper insulating device (200A) and a lower insulating device (200B). The pair of insulating devices (200A, 200B) may be arranged one on the outside of one side and one on the outside of the other side along the longitudinal direction of the jelly roll (20). Since the jelly roll (20) is the same as the jelly roll (20) indicated by the same reference numeral as illustrated in FIGS. 2 to 6, a duplicate description will be omitted.

[0121] The upper insulating device (200A) and the lower insulating device (200B) are made of an insulating material and each include an insulating plate portion (202A, 202B), a deformation prevention portion (220A, 220B), and a protruding holder (230A, 230B). The insulating plate portions (202A, 202B) are approximately disk-shaped and made of an insulating material. The insulating plate portions (202A, 202B) overlap the jelly roll (20).

[0122] The insulating plate portion (202A) of the upper insulating device (200A) may overlap the jelly roll (20) to cover the upper portion (21) of the jelly roll (20), and the insulating plate portion (202B) of the lower insulating device (200B) may overlap the jelly roll (20) to cover the lower portion (22) of the jelly roll (20). The upper insulating device (200A), the jelly roll (20), and the lower insulating device (200B) may be arranged in a row along the central axis (CX).

[0123] The deformation prevention portion (220A, 220B) is made of an insulating material and protrudes from the insulating plate portion (202A, 202B) so as to be fitted into the hollow portion (25) of the jelly roll (20). The deformation prevention portion (220A, 220B) may include a plurality of protruding pieces (222A, 222B) and a plurality of protruding piece stoppers (226A, 226B).

[0124] A through hole (206A, 206B) aligned with the hollow (25) may be formed in the central portion of the insulating plate portion (202A, 202B). A plurality of protruding pieces (222A, 222B) may protrude from the inner surface of the through hole (206A, 206B) to be inserted into the hollow (25). The center of the through hole (206A, 206B) may coincide with the central axis (CX).

[0125] An electrode tab through hole (204A, 204B) through which an electrode tab (51, 53) (see Fig. 2) passes may be formed on the outside of the through hole (206A, 206B) in the insulating plate portion (202A, 202B).

[0126] The positive electrode tab (51) can electrically connect the positive electrode plate and the cap down (37) of the cap assembly (30) across the electrode tab through-hole (204A) of the upper insulating plate portion (202A). The negative electrode tab (53) can electrically connect the negative electrode plate and the bottom portion (12) of the cell case (11) across the electrode tab through-hole (204B) of the lower insulating plate portion (202B).

[0127] A plurality of protrusions (222A, 222B) may be arranged along a single circular orbit centered on the center of the aperture (206A, 206B), i.e., the central axis (CX). The plurality of protrusions (222A, 222B) may be arranged at equal angular intervals based on the center (CX) of the aperture (206A, 206B) and may have a shape that is symmetrical based on the center (CX) of the aperture (206A, 206B).

[0128] The plurality of protrusions (222A, 222B) are made of an insulating material and can be formed integrally with the insulating plate portion (202A, 202B). By pressing the plurality of protrusions (222A, 222B) so that they are bent in the insulating plate portion (202A, 202B) and protrude in a direction toward the jelly roll (20), the through holes (206A, 206B) of the insulating plate portion (202A, 202B) can be formed.

[0129] For example, as illustrated in FIGS. 11 and 12, the insulating plate portions (202A, 202B) may be provided with fold lines (210A, 210B) along a single circular path centered on the central axis (CX). For example, the fold lines (210A, 210B) may be formed as concave grooves on the surface of the insulating plate portions (202A, 202B), or may be formed as a dot pattern penetrating the insulating plate portions (202A, 202B) in the thickness direction at regular intervals.

[0130] Additionally, the insulating plate portions (202A, 202B) may be formed with protruding boundary lines (212A, 212B) extending radially from the central axis (CX). The protruding boundary lines (212A, 212B) may be formed to a length that touches the fold lines (210A, 210B) or extends slightly further by crossing the fold lines (210A, 210B). The protruding boundary lines (212A, 212B) may be formed at equiangular intervals.

[0131] For example, the protruding boundary line (212A, 212B) may be formed as a cut line extending in a straight line penetrating the insulating plate portion (202A, 202B) in the thickness direction, or may be formed as a dot pattern penetrating the insulating plate portion (202A, 202B) in the thickness direction at regular intervals.

[0132] When a plurality of protrusions (222A, 222B) that are spread out parallel to the insulating plate portion (202A, 202B) are pressed in a direction parallel to the central axis (CX) with the worker's fingers or using a tool, the plurality of protrusions (222A, 222B) can be bent along the fold lines (210A, 210B). The plurality of protrusions (222A, 222B) can be spread apart so that the ends of the plurality of protrusions (222A, 222B) are spaced apart from each other, and a through hole (206A, 206B) can be formed. The plurality of protrusions (222A, 222B) can have an approximately isosceles triangle shape.

[0133] When a plurality of protrusions (222A, 222B) that are spread out parallel to the insulating plate portion (202A, 202B) are pressed in a direction parallel to the thickness of the insulating plate portion (202A, 202B), the plurality of protrusions (222A, 222B) are spread out along the boundary line of the protrusions (212A, 212B), and a through hole (206A, 206B) of the insulating plate portion (202A, 202B) is formed.

[0134] When the upper insulating plate part (202A) is positioned so that the plurality of protrusions (222A) of the upper insulating plate part (202A) are aligned with the hollow portion (25) of the jelly roll (20) and the plurality of protrusions (222A) are pressed toward the jelly roll (20), the plurality of protrusions (222A) can be inserted into the entrance of the hollow portion (25) of the upper portion (21) of the jelly roll (20). When the lower insulating plate part (202B) is positioned so that the plurality of protrusions (222B) of the lower insulating plate part (202B) are aligned with the hollow portion (25) of the jelly roll (20), and the plurality of protrusions (222B) are pressed toward the jelly roll (20), the plurality of protrusions (222B) can be inserted into the entrance of the hollow portion (25) of the lower portion (22) of the jelly roll (20).

[0135] The protrusion holders (230A, 230B) can be fitted into the through holes (206A, 206B) of the insulating plate portions (202A, 202B) such that the plurality of protrusions (222A, 222B) are bent at angles (AA, AB) relative to the insulating plate portions (202A, 202B). The outer edges of the protrusion holders (230A, 230B) can be brought into contact with the plurality of protrusions (222A, 222B). The diameter of the protrusion holders (230A, 230B) can be equal to or slightly smaller than the inner diameter of the through holes (206A, 206B).

[0136] The protruding holders (230A, 230B) may be made of an insulating material. The planar shape of the protruding holders (230A, 230B) may be, for example, circular. However, if the fold lines (210A, 210B) are formed in a polygonal shape, such as a hexagon or an octagon, instead of a circular shape, the planar shape of the protruding holders (230A, 230B) may also be a polygon corresponding to the shape of the fold lines (210A, 210B).

[0137] A plurality of protruding piece stoppers (226A, 226B) may protrude stepwise from a plurality of protruding pieces (222A, 222B) to prevent the protruding piece holders (230A, 230B) from being separated from the plurality of protruding pieces (222A, 222B). The protruding piece stoppers (226A, 226B) may protrude one by one from each of the protruding pieces (222A, 222B) and may be formed integrally with each of the protruding pieces (222A, 222B). The protruding piece stoppers (226A, 226B) may be made of an insulating material.

[0138] A plurality of protruding stoppers (226A) of the upper insulating device (200A) may be positioned at the same height along the central axis (CX), and a plurality of protruding stoppers (226B) of the lower insulating device (200B) may be positioned at the same height along the central axis (CX).

[0139] Since the outer periphery of the protruding piece holder (230A, 230B) inserted into the hole (206A, 206B) is supported by a plurality of protruding piece stoppers (226A, 226B), the protruding piece holder (230A, 230B) can maintain its posture without being separated or detached from the plurality of protruding pieces (222A, 222B). Accordingly, the plurality of protruding pieces (222A, 222B) can maintain the bent angle (AA, AB) without being elastically restored.

[0140] A plurality of protrusions (222A, 222B) are arranged so as to be in close contact with the inner surface (26) of the hollow portion (25) of the jelly roll (20) so as to face each other. Therefore, when the battery cell (10) is charged or discharged, the inner surface (26) of the jelly roll (20) can be in contact with the plurality of protrusions (222A, 222B) as the electrode plates constituting the jelly roll (20) expand or contract. Even when the battery cell (10) is not charged or discharged, the inner surface (26) of the jelly roll (20) can be in contact with the plurality of protrusions (222A, 222B).

[0141] Due to this, deformation of the jelly roll (20), such as folding or bending of the electrode plate in the central portion of the jelly roll (20) including the inner side (26) of the jelly roll (20), accidents such as short circuit or voltage drop of the battery cell (10) are prevented, and the durability of the battery cell (10) can be improved.

[0142] The upper insulating device (200A) and the lower insulating device (200B) can be assembled by folding a plurality of protruding pieces (222A, 222B) along the fold lines (210A, 210B) and inserting the protruding piece holders (230A, 230B) into the interior of the holes (206A, 206B) until they are caught and supported by the plurality of protruding piece stoppers (226A).

[0143] The jelly roll (20), the upper insulating device (200A), and the lower insulating device (200B) can be inserted and installed together into the interior of the cell case (11) in a state where the upper insulating device (200A) overlaps the upper part (21) of the jelly roll (20), and the lower insulating device (200B) overlaps the lower part (22) of the jelly roll (20).

[0144] However, the assembly order described above is merely an example, and unlike the example described above, the lower insulating device (200B), jelly roll (20), and upper insulating device (200A) may be inserted and installed inside the cell case (11) in the following order. In addition, in the case of the upper insulating device (200A), the insulating plate portion (202A) of the upper insulating device (200A) may be placed overlapping the upper end (21) of the jelly roll (20) so that the hollow portion (25) and the through hole (206A) of the jelly roll (20) are aligned along the central axis (CX), and a plurality of protruding pieces (222A, 222B) are pressed and bent so that they are inserted into the hollow portion (25), and the protruding piece holder (230A) is inserted into the through hole (206A), thereby allowing the upper insulating device (201A) to be installed inside the cell case (11).

[0145] An electrolyte can be injected so that the jelly roll (20) is impregnated into the inside of the cell case (11) while the jelly roll (20), the upper insulating device (200A), and the lower insulating device (200B) are housed inside the cell case (11). The electrolyte can penetrate into the inside of the jelly roll (20) not only through the outer surface of the jelly roll (20) but also through the inner surface (26) of the jelly roll (20). In other words, the electrolyte can flow into the inside of the hollow (25) through the holes (206A, 206B) and penetrate into the inside of the jelly roll (20) through the inner surface (26).

[0146] For example, the length (LD2) of the deformation prevention portion (220A, 220B) in the direction parallel to the central axis (CX) may be 1 / 10 to 1 / 3 of the length (LR2) of the jelly roll (20). Deformation of the inner surface (26) of the jelly roll (20) due to charging and discharging of the battery cell (10) is easily found at the upper portion (21) and the lower portion (22), but is hardly found at the middle portion between the upper portion (21) and the lower portion (22).

[0147] Therefore, if the length (LD2) of the deformation prevention part (220A, 220B) is greater than 1 / 3 of the length (LR2) of the jelly roll (20), the inner surface (26) of the hollow (25) is excessively covered by the deformation prevention part (220A, 220B), so that the deformation prevention effect of the jelly roll (20) by the deformation prevention part (220A, 220B) is not further improved, and the side effect of delaying the diffusion and impregnation speed of the electrolyte may increase.

[0148] Meanwhile, if the length (LD2) of the deformation prevention part (220A, 220B) is less than 1 / 10 of the length (LR2) of the jelly roll (20), the length (LD2) of the deformation prevention part (220A, 220B) is too short, and the effect of preventing deformation of the inner surface (26) of the jelly roll (20) at the upper part (21) and the lower part (22) may be reduced.

[0149] The insulating device (200A, 200B) described with reference to FIGS. 7 to 12 has deformation prevention members (220A, 220B) positioned only at the ends (21, 22) in the longitudinal direction of the jelly roll (20). This allows the electrolyte to be rapidly impregnated into the entire area of ​​the jelly roll (20). Accordingly, the manufacturing productivity of the battery cell (10) can be improved, and the energy efficiency during charging and discharging of the battery cell (10) can be improved.

[0150] Meanwhile, unlike those illustrated in FIGS. 3 to 10, one insulating device may be provided within the battery cell (10). In this case, one insulating device may be placed at one point between the outside of one end (21) and the outside of the other end (22) along the length direction of the jelly roll (20).

[0151] Fig. 13 is a cross-sectional view illustrating a modified example of the upper insulating device illustrated in Fig. 9, and Fig. 14 is a cross-sectional view illustrating a modified example of the lower insulating device illustrated in Fig. 10. The insulating device (201A) illustrated in Fig. 13 can be installed inside the battery cell (10) (see Fig. 2) in place of the upper insulating device (201A) illustrated in Figs. 7 to 9. The insulating device (201B) illustrated in Fig. 14 can be installed inside the battery cell (10) (see Fig. 2) in place of the lower insulating device (201B) illustrated in Figs. 7, 8, and 10.

[0152] Referring to FIGS. 7, 8, 13, and 14, the upper insulating device (201A) and the lower insulating device (201B) are made of an insulating material and include an insulating plate portion (203A, 203B), a deformation prevention portion (221A, 221B), and a protruding holder (230A, 230B), respectively. The insulating plate portions (203A, 203B) are approximately disk-shaped and made of an insulating material. The insulating plate portions (203A, 203B) overlap with the jelly roll (20).

[0153] The insulating plate portion (203A) of the upper insulating device (201A) may overlap the jelly roll (20) to cover the upper portion (21) of the jelly roll (20), and the insulating plate portion (203B) of the lower insulating device (201B) may overlap the jelly roll (20) to cover the lower portion (22) of the jelly roll (20). The upper insulating device (201A), the jelly roll (20), and the lower insulating device (201B) may be arranged in a row along the central axis (CX).

[0154] The deformation prevention portion (221A, 221B) is made of an insulating material and protrudes from the insulating plate portion (203A, 203B) so as to fit into the hollow portion (25) of the jelly roll (20). The deformation prevention portion (221A, 221B) may include a plurality of protruding pieces (222A, 222B) and a plurality of protruding piece stoppers (226A, 228A, 226B, 228B).

[0155] A through hole (206A, 206B) aligned with the hollow (25) may be formed in the center of the insulating plate portion (203A, 203B). A plurality of protrusions (222A, 222B) may protrude from the inner surface of the through hole (206A, 206B) to be inserted into the hollow (25). The center of the through hole (206A, 206B) may coincide with the central axis (CX). An electrode tab through hole (204A, 204B) through which an electrode tab (51, 53) (see FIG. 2) passes may be formed on the outside of the through hole (206A, 206B) in the insulating plate portion (203A, 203B).

[0156] The protruding piece holder (230A, 230B) can be fitted into the through holes (206A, 206B) of the insulating plate portion (203A, 203B) and brought into contact with the plurality of protruding pieces (222A, 222B) so that the plurality of protruding pieces (222A, 222B) are maintained at a bent angle (AA, AB) with respect to the insulating plate portion (203A, 203B). The plurality of protruding pieces (222A, 222B) and the protruding piece holder (230A, 230B) are the same as the plurality of protruding pieces (222A, 222B) and the protruding piece holder (230A, 230B) included in the insulating device (200A, 200B) described with reference to FIGS. 7 to 12 and are indicated by the same reference numerals, so that a duplicate description will be omitted.

[0157] A plurality of protruding piece stoppers (226A, 228A, 226B, 228B) may protrude stepwise from a plurality of protruding pieces (222A, 222B) so as to prevent the protruding piece holders (230A, 230B) from being separated from the plurality of protruding pieces (222A, 222B). The protruding piece stoppers (226A, 228A, 226B, 228B) may protrude in pairs from each of the protruding pieces (222A, 222B) and may be formed integrally with each of the protruding pieces (222A, 222B). The protruding piece stoppers (226A, 228A, 226B, 228B) may be made of an insulating material.

[0158] The protruding piece stoppers (226A, 228A, 226B, 228B) may include a first protruding piece stopper (226A, 226B) and a second protruding piece stopper (228A, 228B) spaced apart at a distance corresponding to the thickness of the protruding piece holder (230A, 230B). The first protruding piece stopper (226A, 226B) may be positioned further from the insulating plate portion (203A, 203B) than the second protruding piece stopper (228A, 228B).

[0159] The plurality of first protruding stoppers (226A) of the upper insulating device (201A) may be positioned at the same height along the central axis (CX), and the plurality of second protruding stoppers (228A) may be positioned at the same height along the central axis (CX). The plurality of first protruding stoppers (226B) of the lower insulating device (201B) may be positioned at the same height along the central axis (CX), and the plurality of second protruding stoppers (228B) may be positioned at the same height along the central axis (CX).

[0160] Since the outer periphery of the protruding piece holder (230A, 230B) inserted into the hole (206A, 206B) is supported by being fitted into the gap between the plurality of first protruding piece stoppers (226A, 226B) and the plurality of second protruding piece stoppers (228A, 228B), the protruding piece holder (230A, 230B) of the insulating device (201A, 201B) illustrated in FIGS. 13 and 14 can maintain its posture without being separated or detached from the plurality of protruding pieces (222A, 222B) more reliably than the protruding piece holder (230A, 230B) of the insulating device (200A, 200B) illustrated in FIGS. 9 and 10. Accordingly, the plurality of protruding pieces (222A, 222B) can maintain the bent angle (AA, AB) without being elastically restored.

[0161] As shown in the dashed lines in FIGS. 13 and 14, when the plurality of protruding pieces (222A, 222B) are bent slightly more than the bending angles (AA, AB), the protruding piece holders (230A, 230B) are positioned at the height of the gap between the plurality of first protruding piece stoppers (226A, 226B) and the plurality of second protruding piece stoppers (228A, 228B) and the force pressing the plurality of protruding pieces (222A, 222B) is released, the plurality of protruding pieces (222A, 222B) are elastically restored to the posture shown in the solid lines, and the protruding piece holders (230A, 230B) are inserted into and supported in the gap between the plurality of first protruding piece stoppers (226A, 226B) and the plurality of second protruding piece stoppers (228A, 228B). In this way, the bending angles (AA, AB) of the plurality of protrusions (222A, 222B) can be maintained.

[0162]

[0163] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. Cell case; A jelly roll in which an electrode assembly is formed by being wound and housed inside the cell case, and in which a hollow space extending in the longitudinal direction is formed; and A battery cell characterized by comprising an insulating device including an insulating plate portion overlapping the jelly roll, and a deformation prevention portion protruding from the insulating plate portion to be fitted into the hollow portion of the jelly roll.

2. In paragraph 1, A battery cell characterized in that the insulating device is arranged at one point between the outer side of one side and the outer side of the other side along the length direction of the jelly roll.

3. In paragraph 1, The above insulating device is provided in pairs, A battery cell characterized in that a pair of said insulating devices are arranged one on the outside of one side and one on the outside of the other side along the length direction of said jelly roll.

4. In paragraph 1, A battery cell characterized in that the length of the deformation prevention part is 1 / 10 to 1 / 3 of the length of the jelly roll.

5. In paragraph 1, A battery cell characterized in that the deformation prevention member includes a tube extending in the longitudinal direction of the jelly roll.

6. In paragraph 5, A battery cell characterized in that the diameter of the above-mentioned pipe portion becomes smaller as it gets farther away from the insulating plate portion.

7. In paragraph 5, A pipe penetration hole through which the pipe penetrates is formed in the above insulating plate portion, A battery cell characterized in that the deformation prevention portion further includes a flange portion that extends in the radial direction so as to be bent from the tube portion.

8. In paragraph 7, A battery cell characterized in that a flange mounting groove to which the flange portion is fixed is formed around the above-mentioned pipe penetration hole.

9. In paragraph 1, The above insulating plate portion includes a through hole aligned with the hollow of the jelly roll, A battery cell characterized in that the deformation prevention member includes a plurality of protruding pieces protruding from the inner surface of the hole of the insulating plate member to be inserted into the hollow portion.

10. In paragraph 9, A battery cell characterized in that the plurality of protrusions are arranged at equal intervals based on the center of the hole of the insulating plate.

11. In paragraph 9, A battery cell characterized in that the plurality of protrusions are arranged symmetrically based on the center of the hole of the insulating plate portion.

12. In paragraph 9, The plurality of protrusions are formed integrally with the insulating plate portion, A battery cell characterized in that the perforations of the insulating plate portion are formed by pressing a plurality of the protruding pieces so that they protrude from the insulating plate portion.

13. In paragraph 12, A battery cell characterized in that the plurality of protruding pieces are bent along a folding line provided on the insulating plate.

14. In paragraph 13, A battery cell characterized in that the above folding line has a circular or polygonal shape centered on the center of the hole of the above insulating plate portion.

15. In paragraph 13, A battery cell characterized in that the insulating plate portion has a protruding boundary line formed therein that extends radially from the center of the hole of the insulating plate portion and touches the folding line.

16. In paragraph 15, A battery cell characterized in that when the plurality of protrusions spread out parallel to the insulating plate portion are pressed in a direction parallel to the thickness of the insulating plate portion, the plurality of protrusions spread out along the boundary line of the protrusions and a through hole in the insulating plate portion is formed.

17. In paragraph 13, A battery cell characterized in that the insulating device further includes a protrusion holder that is fitted into the hole of the insulating plate and contacts the plurality of protrusions.

18. In paragraph 17, A battery cell characterized in that the plane shape of the above protruding holder is a shape corresponding to the shape of the above folding line.

19. In paragraph 17, A battery cell characterized in that the deformation prevention member further includes a protruding stopper that protrudes from the protruding member in a stepwise manner to block the protruding member holder.

20. In paragraph 19, The above protruding piece stopper includes a first protruding piece stopper and a second protruding piece stopper spaced apart at a distance corresponding to the thickness of the protruding piece holder, A battery cell characterized in that the outer peripheral portion of the protruding piece holder is fitted into the gap between the first protruding piece stopper and the second protruding piece stopper.

Images