Battery cell

Abstract

The present disclosure relates to a battery cell, and the technical aim to be achieved is to provide a battery cell including an insulation mechanism that prevents deformation of a center portion of an electrode assembly wound in a jelly-roll form. To this end, the present invention provides a battery cell including: a cell case; a jelly-roll formed by winding an electrode assembly and accommodated in the cell case, and in which a hollow portion extending in a longitudinal direction is formed; and an insulation mechanism including an insulation plate overlapping the jelly-roll and a deformation prevention portion protruding from the insulation plate to fit into the hollow portion.

Description

Technical Field

[0001] This disclosure relates to a battery cell. Background Technology

[0002] Generally speaking, with the rapid increase in demand for portable electronic products such as laptops, cameras and mobile phones, and the full-scale commercialization of robots and electric vehicles, research is actively being conducted on high-performance rechargeable and rechargeable batteries.

[0003] In a cylindrical cell of a secondary battery, an electrode assembly wound in the form of an electrode core can be housed within a cylindrical casing. The electrode assembly includes electrode plates and a separator between the electrode plates.

[0004] As the electrode plates repeatedly expand and contract due to the charging and discharging of the cylindrical battery cells, the wound center portion (i.e., the central portion) of the electrode assembly in the form of the electrode core may deform. When the central portion of the electrode core deforms, a short circuit or voltage drop may occur. Summary of the Invention

[0005] [Technical Issues]

[0006] The present invention aims to provide a battery cell including an insulating mechanism that prevents deformation of the central portion of an electrode assembly wound in the form of an electrode core.

[0007] However, the technical objectives to be achieved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of this disclosure other objectives not described above.

[0008] [Technical Solution]

[0009] According to an embodiment of the present invention, a battery cell for achieving the above-mentioned technical objective includes: a cell housing; an electrode core formed by winding an electrode assembly and housed in the cell housing, and having a hollow portion extending in a longitudinal direction formed in the electrode core; and an insulation mechanism including an insulating plate overlapping the electrode core and an anti-deformation portion protruding from the insulating plate to be fitted into the hollow portion of the electrode core.

[0010] The insulation mechanism may be located at one of the positions on the outside of one side and the other side of the pole core in the longitudinal direction.

[0011] The insulation mechanism can be provided as a pair of insulation mechanisms, and the pair of insulation mechanisms can be disposed on the outside of one side and the other side of the pole core in the longitudinal direction, one on each side.

[0012] The length of the anti-deformation part can be 1 / 10 to 1 / 3 of the length of the pole core.

[0013] The anti-deformation part may include a tube extending in the longitudinal direction of the pole core.

[0014] The diameter of the tube can be reduced by moving away from the insulating plate.

[0015] A through-hole may be formed in the insulating plate through which the tube passes, and the anti-deformation portion may further include a flange that extends to bend from the tube in the radial direction.

[0016] A flange mounting groove may be formed around the through hole, and the flange is fixed in the flange mounting groove.

[0017] The insulating plate may include a through hole aligned with the hollow portion of the pole core, and the anti-deformation portion may include a plurality of protrusions protruding from the inner surface of the through hole of the insulating plate to be inserted into the hollow portion.

[0018] The plurality of protrusions may be arranged at equal intervals around the center of the through hole in the insulating plate.

[0019] The plurality of protrusions can be arranged symmetrically around the center of the through hole in the insulating plate.

[0020] The plurality of protrusions can be integrally formed with the insulating plate, and the through holes in the insulating plate can be formed by pressing the plurality of protrusions to make the plurality of protrusions protrude from the insulating plate.

[0021] The plurality of protrusions can be bent along the fold lines provided on the insulating plate.

[0022] The folded line can have a circular or polygonal shape centered on the center of the through hole in the insulating plate.

[0023] A protruding boundary line extending radially from the center of the through hole in the insulating plate and contacting the fold line may be formed in the insulating plate.

[0024] When the plurality of protrusions extending parallel to the insulation plate are pressed in a direction parallel to the thickness of the insulation plate, the plurality of protrusions can unfold along the boundary line of the protrusions and can form the through hole of the insulation plate.

[0025] The insulation mechanism may further include a protrusion retainer, which is fitted into the through-hole of the insulation plate and contacts the plurality of protrusions.

[0026] The planar shape of the protruding retainer can be a shape corresponding to the shape of the fold line.

[0027] The anti-deformation part may further include a protruding stop portion, which protrudes from the protrusion in a stepped shape and blocks the protrusion retainer.

[0028] The protruding member stop portion may include a first protruding member stop portion and a second protruding member stop portion, the first protruding member stop portion and the second protruding member stop portion being spaced apart from each other by a distance corresponding to the thickness of the protruding member retainer, and the outer peripheral portion of the protruding member retainer being fitted into the gap between the first protruding member stop portion and the second protruding member stop portion.

[0029] [Beneficial Effects]

[0030] According to an embodiment of the present invention, the anti-deformation portion of the insulation mechanism is configured to face the inner surface of the hollow portion of the electrode core formed by the electrode assembly and to be in contact with the inner surface of the hollow portion of the electrode core formed by the electrode assembly. Accordingly, deformation of the electrode core (such as folding or bending of the electrode plate) can be prevented in the central portion of the electrode core, accidents such as short circuits or voltage drops in the battery cell can be prevented, and the durability of the battery cell can be improved.

[0031] According to an embodiment of the invention, the anti-deformation portion of the insulation mechanism is only provided on the end portion of the electrode core in the longitudinal direction. Accordingly, the entire area of ​​the electrode core can be quickly immersed in the electrolyte. Consequently, the manufacturing productivity of the battery cell can be improved, and the energy efficiency during charging or discharging of the battery cell can be improved.

[0032] However, the beneficial effects that can be obtained by the present invention are not limited to those mentioned above, and those skilled in the art should clearly understand other unmentioned beneficial effects from the above description of the present invention. Attached Figure Description

[0033] The accompanying drawings, which are attached to this document, illustrate preferred embodiments of the invention by way of example and, together with the detailed description of the invention given below, are intended to enable a further understanding of the technical concept of the invention, and therefore the invention should not be interpreted solely by the matters in these drawings.

[0034] Figure 1 This is a perspective view illustrating a battery cell according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic longitudinal cross-sectional view illustrating the interior of a battery cell according to a first embodiment of the present invention.

[0036] Figure 3 It is an example of being contained in Figure 2 An exploded top perspective view of the electrode core, upper insulation mechanism, and lower insulation mechanism in a single battery cell.

[0037] Figure 4 This is an example Figure 3 Exploded bottom perspective view of the pole core, upper insulation mechanism and lower insulation mechanism.

[0038] Figure 5 This is an example Figure 3 An enlarged cross-sectional view of the anti-deformation part of the upper insulation mechanism inserted into the hollow part of the pole core.

[0039] Figure 6 This is an example Figure 4 An enlarged cross-sectional view of the anti-deformation part of the lower insulation mechanism inserted into the hollow part of the pole core.

[0040] Figure 7 This is an exploded top perspective view illustrating the electrode core, upper insulation mechanism, and lower insulation mechanism housed in a battery cell according to a second embodiment of the present invention.

[0041] Figure 8 This is an example Figure 7 Exploded bottom perspective view of the pole core, upper insulation mechanism and lower insulation mechanism.

[0042] Figure 9 This is an example Figure 7 An enlarged cross-sectional view of the anti-deformation part of the upper insulation mechanism inserted into the hollow part of the pole core.

[0043] Figure 10 This is an example Figure 7 An enlarged cross-sectional view of the anti-deformation part of the lower insulation mechanism inserted into the hollow part of the pole core.

[0044] Figure 11 This is an example Figure 7 A plan view of an upper or lower insulating plate and a plurality of protrusions integrally formed with the upper or lower insulating plate, the plan view illustrating the plurality of protrusions without being bent.

[0045] Figure 12 It is along Figure 11 The cross-sectional view of the line XII-XII cut.

[0046] Figure 13 This is an example Figure 9 A cross-sectional view of a modified example of the upper insulation mechanism illustrated in the figure.

[0047] Figure 14 This is an example Figure 10 A cross-sectional view of a modified example of the lower insulation mechanism illustrated in the figure. Detailed Implementation

[0048] Preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings. Prior to this, it should be noted that the terms or words used in this specification and claims should not be construed as limited to their general or dictionary meaning, and should be interpreted in accordance with the principle that the inventor may be his / her own lexicographer to appropriately define the concepts of terms so as to best describe his / her invention, and are consistent with the technical spirit of the invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely some of the most preferred embodiments of the invention and do not represent all the technical spirit of the invention. It should be understood that various equivalents and modifications may exist at the time of filing this application, replacing the embodiments described herein.

[0049] Additionally, when used in this specification, the terms “comprising” and / or “including” specify the presence of the stated shapes, quantities, steps, operations, components, elements and / or groups thereof, but do not exclude the presence or addition of one or more other shapes, quantities, operations, components, elements and / or groups thereof.

[0050] Furthermore, for a better understanding of the invention, the accompanying drawings are not drawn to scale, and the dimensions of some components may be exaggerated. Additionally, in different embodiments, the same reference numerals may be assigned to the same components.

[0051] Referring to two comparable objects as "identical" means that they are "substantially identical." Therefore, the phrase "substantially identical" can include situations where the deviation is considered low in the field (e.g., less than 5%). Furthermore, the consistency of a parameter within a predetermined region can mean that the parameter is consistent with respect to its average value.

[0052] Although the terms “first,” “second,” etc., may be used to describe various components, components should not be limited by these terms. These terms are used to distinguish one component from another, and unless otherwise stated, the first component may also be referred to as the second component.

[0053] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0054] Arranging any configuration "above (or below)" or "on (or under)" a component can mean that the arbitrary configuration is configured to contact the upper (or lower) surface of the component, or it can mean that another configuration is located between the component and the arbitrary configuration located on (or under) the component.

[0055] Additionally, it should be understood that when a component is referred to as being "on" another component, "connected to" or "linked to" another component, these components may be directly connected or linked to each other, but another component may be "between" these components, or the corresponding component may also be "connected," "linked," or "linked" through another component.

[0056] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Additionally, when describing embodiments of this disclosure, the use of "may" refers to one or more embodiments of this disclosure. Expressions such as "one or more" and "one or more" preceding / following the list of elements modify the entire list of elements, not individual elements within that list.

[0057] Throughout the specification, when “A and / or B” is mentioned, it means A, B or A and B, unless otherwise stated, and when “C~D” is mentioned, it means that it is above C and below D, unless otherwise stated.

[0058] When the phrase “at least one of A, B or C”, “at least one selected from the group of A, B and C”, or “at least one selected from A, B and C” is used to specify a list of elements A, B and C, the phrase can refer to any and all suitable combinations.

[0059] The term “use” may be considered synonymous with the term “utilize”. As used herein, the terms “substantially,” “about,” and similar terms are used as approximate terms rather than terms of degree and are intended to take into account the inherent variations in the measured or calculated values ​​that will be recognized by those skilled in the art.

[0060] Although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or segment from another element, component, region, layer, or segment. Therefore, without departing from the teachings of the exemplary embodiments, the first element, first component, first region, first layer, or first segment discussed below may be referred to as a second element, second component, second region, second layer, or second segment.

[0061] As illustrated in the accompanying drawings, for ease of description, spatially relative terms such as “below,” “under,” “down,” “above,” and “up” may be used herein to describe the relationship of one element or feature to another element(s). It will be understood that spatially relative terms are intended to cover different orientations of the device in use or operation other than those depicted in the drawings. For example, if the device shown in the figures is flipped, an element described as “below” or “under” other elements would then be considered oriented “above” or “up” to those elements. Thus, the term “below” can encompass both the above and below directions.

[0062] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0063] In an exemplary embodiment of a prismatic / pocket / cylindrical battery according to an embodiment of the present disclosure, one of the prismatic / pocket / cylindrical batteries is selected and the selected battery is described as having a general structure, and in the case of conventional application technology, the general structure of the prismatic / pocket / cylindrical battery will be described.

[0064] Figure 1 This is a perspective view illustrating a battery cell according to an embodiment of the present invention, and Figure 2 This is a schematic longitudinal cross-sectional view illustrating the interior of a battery cell according to a first embodiment of the present invention. Figure 3 It is an example of being contained in Figure 2 An exploded top perspective view of the electrode core, upper insulation mechanism, and lower insulation mechanism in a single battery cell, and Figure 4 This is an example Figure 3 Exploded bottom perspective view of the pole core, upper insulation mechanism and lower insulation mechanism. Figure 5 This is an example Figure 3 An enlarged cross-sectional view of the anti-deformation part of the upper insulation mechanism inserted into the hollow part of the pole core, and Figure 6 This is an example Figure 4 An enlarged cross-sectional view of the anti-deformation part of the lower insulation mechanism inserted into the hollow part of the pole core.

[0065] refer to Figures 1 to 6 According to one embodiment of the present invention, a battery cell 10 may include a cell housing 11, an electrode core 20, and a pair of insulating mechanisms 100A and 100B. (See reference) Figure 1 and Figure 2 The battery cell 10 may include a cell housing 11, an electrode core 20, and a cover assembly 30.

[0066] The monocoque housing 11 may include a bottom portion 12 having a generally cylindrical shape and a side wall portion 13 extending upward from the bottom portion 12 for a predetermined length. The monocoque housing 11 may be made of steel, steel alloy, nickel-plated steel, nickel-plated steel alloy, aluminum, or aluminum alloy.

[0067] During the manufacturing process of the battery cell 10, the upper portion of the cell housing 11 can be opened. During the assembly process of the battery cell 10, the electrode core 20 formed by winding the electrode assembly can be inserted into the cell housing 11. Then, electrolyte can be injected into the cell housing 11.

[0068] A coiled portion 14 recessed toward the central axis of the cover assembly 30 may be formed on the upper side of the single housing 11 to prevent the cover assembly 30 from detaching from the outside. The coiled portion 14 may be provided below the cover assembly 30. A crimped portion 15 bent to surround the edge of the cover assembly 30 may be formed on the coiled portion 14.

[0069] The electrode core 20, formed by winding the electrode assembly, can be housed in the cell housing 11. The electrode assembly can serve as a unit structure for performing electrical charging and discharging within the battery cell 10.

[0070] The electrode assembly may include: a negative electrode plate coated with a negative electrode active material (such as graphite and carbon); a positive electrode plate coated with a positive electrode active material (such as transition metal oxides (LiCoO2, LiNiO2, LiMn2O4, etc.)); and a separator located between the negative and positive electrode plates to prevent short circuits and allow only the movement of lithium ions. The negative electrode plate, positive electrode plate, and separator may be wound into a substantially cylindrical shape. In some examples, the negative electrode plate may be formed of copper (Cu) foil, the positive electrode plate may be formed of aluminum (Al) foil, and the separator may be formed of polyethylene (PE) or polypropylene (PP).

[0071] The negative electrode contact 53 can be soldered to the negative electrode plate. The negative electrode contact 53 can protrude downward from the electrode assembly and extend for a predetermined length. The positive electrode contact 51 can be soldered to the positive electrode plate. The positive electrode contact 51 can protrude upward from the electrode assembly and extend for a predetermined length. The negative electrode contact 53 can be formed of copper (Cu) or nickel (Ni), and the positive electrode contact 51 can be formed of aluminum (Al).

[0072] The negative terminal piece 53 can be soldered to the bottom portion 12 of the housing 11. Accordingly, the housing 11 can operate as the negative terminal. In some examples, the negative terminal piece 53 can be ultrasonically or laser-welded to the bottom portion 12 of the housing 11. Conversely, the positive terminal piece 51 can be soldered to the bottom portion 12 of the housing 11, and in this case, the housing 11 can operate as the positive terminal.

[0073] The cover assembly 30 can close the opening of the cell housing 11 and protect the electrode assembly from the external environment. When the internal pressure of the cell housing 11 exceeds a reference pressure due to thermal runaway or fire of the cell 10, the cover assembly 30 can rupture, and the gas in the cell housing 11 can be released to the outside. In some examples, the cover assembly 30 can be used as the positive terminal.

[0074] The cover assembly 30 may include an upper cover 31, an exhaust plate 36, and a lower cover 37. The upper cover 31 may be used as a terminal for electrical connection to an external device. In some examples, the upper cover 31 may be used as a positive terminal.

[0075] An exhaust port VT may be formed in the top cover 31. The exhaust port VT can be used to release internal gases in the housing 11 in the event of abnormal pressure due to reasons such as overcharging. The top cover 31 may be made of aluminum or an aluminum alloy.

[0076] As an example, the top cover 31 may include an inner body 32, an outer body 33, and a bridging portion 34.

[0077] The inner body 32 can form the appearance of the central portion of the top cover 31. As an example, the inner body 32 can be formed into a basically dish shape. The inner body 32 can be configured such that the central axis of the inner body 32 is aligned with the central axis CX of the monocoque housing 11.

[0078] The outer body 33 can form the appearance of the edge of the top cover 31. As an example, the outer body 33 can be formed into a substantially hollow annular shape. The diameter of the outer body 33 can be larger than the diameter of the inner body 32. The outer body 33 can be coaxially arranged with the inner body 32. That is, the central axis of the outer body 33 can be arranged to be aligned with the central axis CX of the inner body 32 and the single housing 11.

[0079] The inner body 32 and the outer body 33 can be arranged in a stepped shape, such that the levels of the inner body 32 and the outer body 33 are different. As an example, the outer body 33 can be positioned below the inner body 32. Alternatively, the inner body 32 and the outer body 33 can also be configured to be coplanar.

[0080] A bridging portion 34 can be disposed between the inner body 32 and the outer body 33, and can support the inner body 32 relative to the outer body 33. The bridging portion 34 can be formed in the shape of a rod, with its two end portions connected to the outer peripheral surface of the inner body 32 and the inner peripheral surface of the outer body 33. Multiple bridging portions 34 can be provided. These multiple bridging portions 34 can be arranged circumferentially spaced apart from each other by a predetermined distance along the central axis CX surrounding the monocoque housing 11. The distance between adjacent bridging portions 34 can be constant.

[0081] The vent VT can be formed as a hole through the top cover 31. As an example, the vent VT can be formed as a hole through the region between the inner body 32 and the outer body 33. Multiple vent VTs can be provided. Multiple vent VTs can be respectively provided in each gap between adjacent bridging portions 34. As an example, the number of vent VTs is not limited to... Figure 1 The number of examples is shown in the text, and various changes can be made to the design.

[0082] The exhaust plate 36 may be located below the upper cover 31. The exhaust plate 36 may be in close contact with, coupled to, or connected to the lower portion of the upper cover 31. As an example, the exhaust plate 36 may be in close contact with, coupled to, or connected to the edge of the upper cover 31 other than the upwardly projecting central portion (i.e., the inner body 32) of the upper cover 31 (i.e., the outer body 33). The exhaust plate 36 may extend in a curved manner to surround the end portion of the outer body 33. The exhaust plate 36 may be made of aluminum or an aluminum alloy.

[0083] The exhaust plate 36 may include a recess 36a. The recess 36a may be formed to be recessed from the outer surface of the exhaust plate 36 to a predetermined depth.

[0084] If the internal pressure of the battery cell 10 rises above a reference pressure or the rupture pressure of the vent plate 36 due to thermal runaway or fire of the battery cell 10, the notch 36a may rupture, and the emissions generated in the cell housing 11 may pass through the notch 36a and the vent VT in sequence and be discharged to the outside. In this case, the emissions discharged through the vent VT may include at least one of flame, gas, and smoke.

[0085] The lower cover 37 can be disposed below the exhaust plate 36. The lower cover 37 can press against, contact with, connect to, or be coupled to the exhaust plate 36. The lower cover 37 can be electrically connected to the electrode core 20 via the positive terminal piece 51. The lower cover 37 can be electrically connected to both the exhaust plate 36 and the upper cover 31. The positive terminal piece 51 of the electrode assembly can be welded to the lower surface of the lower cover 37. In some examples, the lower surface of the lower cover 37 can be ultrasonically and / or laser welded to the positive terminal piece 51. In some examples, the lower cover 37 can be made of aluminum or an aluminum alloy.

[0086] In some examples, when thermal runaway or fire occurs in the battery cell 10, the vent plate 36 may deform due to the internal pressure of the cell housing 11, and the lower cover 37 and the vent plate 36 may be electrically separated from each other.

[0087] A first insulating member 38 may be installed between the exhaust plate 36 and the lower cover 37. The first insulating member 38 may be located between the edge of the exhaust plate 36 and the edge of the lower cover 37. The first insulating member 38 may be used to insulate the lower cover 37 from the exhaust plate 36 when the exhaust plate 36 deforms due to internal gas. In some examples, the first insulating member 38 may be formed of a resin material such as PE, PP, or terephthalate (PET), but this is not the case.

[0088] The second insulating member 39 may be disposed on the upper side of the single housing 11. The second insulating member 39 may be located between the end portion of the vent plate 36 surrounding the outer body 33 of the upper cover 31 and the single housing 11. Both sides of the second insulating member 39 may be in close contact with the end portion of the vent plate 36 and the inner surfaces of the pressing portion 15 and the pressing portion 14. The second insulating member 39 may be used to insulate the housing 210 from the cover assembly 30. The second insulating member 39 may be formed of a resin material such as PE, PP or PET, but is not limited to this in this case.

[0089] The electrode core 20 can be formed by winding an 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 electrode core 20 can extend along the central axis CX. A hollow portion 25 extending in its longitudinal direction along the central axis CX can be formed in the electrode core 20.

[0090] A pair of insulating mechanisms 100A and 100B are provided. The pair of insulating mechanisms 100A and 100B are classified as upper insulating mechanism 100A and lower insulating mechanism 100B. The pair of insulating mechanisms 100A and 100B can be disposed on the exterior of one side and the other side of the pole core 20 in the longitudinal direction, one on each side.

[0091] The upper insulating mechanism 100A and the lower insulating mechanism 100B are formed of insulating material and respectively include insulating plates 101A and 101B and anti-deformation parts 120A and 120B. Each of the insulating plates 101A and 101B is formed in a substantially disc shape and is made of insulating material. The insulating plates 101A and 101B overlap with the pole core 20.

[0092] The insulating plate 101A of the upper insulating mechanism 100A can overlap with the pole core 20 to cover one end portion 21 of the pole core 20 facing the cover assembly 30, and the insulating plate 101B of the lower insulating mechanism 100B can overlap with the pole core 20 to cover the other end portion 22 of the pole core 20 facing the bottom portion 12 of the single-unit housing 11. The upper insulating mechanism 100A, the pole core 20, and the lower insulating mechanism 100B can be arranged in a straight line along the central axis CX.

[0093] In the following text, it is assumed that the cover assembly 30 is located at a level higher than the bottom portion 12. Accordingly, one end portion 21 of the pole core 20 will be referred to as the upper end portion, and the other end portion 22 of the pole core 20 will be referred to as the lower end portion.

[0094] The anti-deformation portions 120A and 120B are formed of insulating material and protrude from the insulating plates 101A and 101B to be fitted into the hollow portion 25 of the pole core 20. The anti-deformation portions 120A and 120B may include tubes 121A and 121B and flanges 126A and 126B. The cross-sectional shape of each of the tubes 121A and 121B may be annular, and each of the tubes 121A and 121B may extend in the longitudinal direction of the pole core 20 (i.e., along the central axis CX).

[0095] Through-holes 106A and 106B can be formed in the central portion of insulating plates 101A and 101B, through which tubes 121A and 121B pass. In insulating plates 101A and 101B, electrode contact through-holes 104A and 104B can be formed outside of the through-holes 106A and 106B, and electrode contacts 51 and 53 (see...) Figure 2 () Passing through the electrode terminal through holes 104A and 104B.

[0096] The positive electrode contact 51 can pass through the electrode contact through hole 104A of the upper insulating plate 101A and is electrically connected to the positive electrode plate and the lower cover 37 of the cover assembly 30. The negative electrode contact 53 can pass through the electrode contact through hole 104B of the lower insulating plate 101B and is electrically connected to the negative electrode plate and the bottom portion 12 of the single-unit housing 11.

[0097] The tube 121A of the upper insulation mechanism 100A can be inserted into the inlet of the hollow portion 25 that opens upward from the pole core 20, and the tube 121B of the lower insulation mechanism 100B can be inserted into the inlet of the hollow portion 25 that opens downward from the pole core 20.

[0098] The tube 121A of the upper insulating mechanism 100A is tapered, so that the diameter DP decreases away from the upper insulating plate 101A. Accordingly, when the tube 121A is inserted and moved into the hollow portion 25, the tube 121A can be slidably inserted into the hollow portion 25 without damaging the inner surface 26 of the defined hollow portion 25 of the pole core 20.

[0099] Similar to the tube 121B of the upper insulating mechanism 100A, the tube 121B of the lower insulating mechanism 100B is tapered, such that its diameter decreases as it moves away from the lower insulating plate 101B. Accordingly, when the tube 121B is inserted into and moved into the hollow portion 25, the tube 121B can be slidably inserted into the hollow portion 25 without damaging the inner surface 26 of the defined hollow portion 25 of the pole core 20.

[0100] Tubes 121A and 121B are configured to face the inner surface 26 of the hollow portion 25 of the electrode core 20, and to be in contact with and close to the inner surface 26 of the hollow portion 25 of the electrode core 20. Accordingly, when the battery cell 10 is charged or discharged, the electrode plates constituting the electrode core 20 can expand or contract, and the inner surface 26 of the electrode core 20 can contact the outer surfaces of tubes 121A and 121B. Even when the battery cell 10 is not charged or discharged, the inner surface 26 of the electrode core 20 can still contact the outer surfaces of tubes 121A and 121B.

[0101] Accordingly, deformation of the electrode core 20 (such as folding or bending of the electrode plate) can be prevented in the central portion of the electrode core 20 including the inner surface 26 of the electrode core 20, accidents such as short circuits or voltage drops in the battery cell 10 can be prevented, and the durability of the battery cell 10 can be improved.

[0102] Flanges 126A and 126B bend from tubes 121A and 121B and extend radially along the central axis CX. Flanges 126A and 126B can protrude from tubes 121A and 121B in annular shape. In the case of the upper insulating mechanism 100A, flange 126A extends radially from the upper end portion of tube 121A, and in the case of the lower insulating mechanism 100B, flange 126B extends radially from the lower end portion of tube 121B.

[0103] The diameter DF of flanges 126A and 126B is greater than the diameter DP of tubes 121A and 121B. Tubes 121A and 121B pass through the tube holes 106A and 106B of insulating plates 101A and 101B, and flanges 126A and 126B do not pass through the tube holes 106A and 106B and are supported by insulating plates 101A and 101B.

[0104] In insulating plates 101A and 101B, flange mounting grooves 110A and 110B can be formed around through holes 106A and 106B. Each of the flange mounting grooves 110A and 110B can be formed in an annular shape. In the case of upper insulating mechanism 100A, flange mounting groove 110A can be formed recessed from the upper surface of insulating substrate 101A in a stepped shape, and in the case of lower insulating mechanism 100B, flange mounting groove 110B can be formed recessed from the lower surface of insulating substrate 101B in a stepped shape.

[0105] The inner diameter DG of flange mounting grooves 110A and 110B may not be greater than the diameter DF of flanges 126A and 126B. In other words, the inner diameter DG of flange mounting grooves 110A and 110B may be slightly less than or equal to the diameter DF of flanges 126A and 126B. However, the inner diameter DG of flange mounting grooves 110A and 110B must not be so small that flanges 126A and 126B cannot be accommodated in flange mounting grooves 110A and 110B.

[0106] Due to this structure, flanges 126A and 126B can be placed in flange mounting grooves 110A and 110B and can also be fixedly press-fitted into flange mounting grooves 110A and 110B, and even in the event of external impact, the deformation-resistant parts 120A and 120B will not separate from the insulating plates 101A and 101B.

[0107] The upper insulation mechanism 100A and the lower insulation mechanism 100B can be assembled by connecting the anti-deformation parts 121A and 121B to the insulation plates 101A and 101B, such that the tube 121A passes through the tube through holes 106A and 106B, and the flanges 126A and 126B are fixedly fitted into the flange mounting grooves 110A and 110B.

[0108] With the upper insulating mechanism 100A positioned to overlap with the upper end portion 21 of the pole core 20 and the lower insulating mechanism 100B positioned to overlap with the lower end portion 22 of the pole core 20, the pole core 20, the upper insulating mechanism 100A and the lower insulating mechanism 100B can all be inserted into and installed in the single-unit housing 11.

[0109] However, the above assembly sequence is merely an example, and unlike the example above, the lower insulating mechanism 100B, the pole core 20, and the upper insulating mechanism 100A can be sequentially inserted into and installed in the single-unit housing 11. Furthermore, in the case of the upper insulating mechanism 100A, the insulating plate 101A of the upper insulating mechanism 100A can be arranged to overlap with the upper end portion 21 of the pole core 20, such that the hollow portion 25 of the pole core 20 and the through-hole 106A are aligned along the central axis CX, and the anti-deformation portion 120A can be connected to the insulating plate 101A, allowing the tube 121A to be assembled into the hollow portion 25.

[0110] With the electrode core 20, upper insulation mechanism 100A, and lower insulation mechanism 100B housed within the single-unit housing 11, electrolyte can be injected into the single-unit housing 11, immersing the electrode core 20 in the electrolyte. The electrolyte can permeate into the electrode core 20 not only through its outer surface but also through its inner surface 26. In other words, the electrolyte can be introduced into the hollow portion 25 through pipes 121A and 121B and can permeate into the electrode core 20 through its inner surface 26.

[0111] For example, the length LD1 of the anti-deformation portions 120A and 120B in the direction parallel to the central axis CX can be 1 / 10 to 1 / 3 of the length LR1 of the electrode core 20. Deformation of the inner surface 26 of the electrode core 20 caused by the charging or discharging of the battery cell 10 is easily found in the upper portion 21 and the lower portion 22, but is rarely found in the middle portion between the upper portion 21 and the lower portion 22.

[0112] Correspondingly, when the length LD1 of the anti-deformation parts 120A and 120B is greater than 1 / 3 of the length LR1 of the electrode core 20, the inner surface 26 of the hollow part 25 is excessively blocked by the anti-deformation parts 120A and 120B. Therefore, the anti-deformation effect of the anti-deformation parts 120A and 120B on the electrode core 20 may not be further improved, and the side effect of reducing the diffusion and impregnation speed of the electrolyte may be serious.

[0113] Meanwhile, when the length LD1 of the anti-deformation parts 120A and 120B is less than 1 / 10 of the length LR1 of the pole core 20, the anti-deformation effect of the inner surface 26 of the pole core 20 in the upper part 21 and the lower part 22 may be reduced because the length LD1 of the anti-deformation parts 120A and 120B is too small.

[0114] Reference Figures 3 to 6 In the described insulation mechanisms 100A and 100B, the anti-deformation portions 120A and 120B are only provided on the longitudinal end portions 21 and 22 of the electrode core 20. Accordingly, the entire area of ​​the electrode core 20 can be quickly immersed in the electrolyte. Consequently, the manufacturing productivity of the battery cell 10 can be improved, and the energy efficiency during charging or discharging of the battery cell 10 can be improved.

[0115] Figure 7 This is an exploded top perspective view illustrating the electrode core, upper insulation mechanism, and lower insulation mechanism housed in a battery cell according to a second embodiment of the present invention. Figure 8 This is an example Figure 7 Exploded bottom perspective view of the pole core, upper insulation mechanism and lower insulation mechanism. Figure 9 This is an example Figure 7An enlarged cross-sectional view of the anti-deformation part of the upper insulation mechanism inserted into the hollow part of the pole core, and Figure 10 This is an example Figure 7 An enlarged cross-sectional view of the anti-deformation part of the lower insulation mechanism inserted into the hollow part of the pole core. Figure 11 This is an example Figure 7 A plan view of an upper or lower insulating plate and a plurality of protrusions integrally formed with the upper or lower insulating plate, the plan view illustrating the plurality of protrusions without being bent, and Figure 12 It is along Figure 11 The cross-sectional view of the line XII-XII cut.

[0116] refer to Figures 7 to 12 A pair of insulating mechanisms 200A and 200B can be provided. The pair of insulating mechanisms 200A and 200B are classified as upper insulating mechanism 200A and lower insulating mechanism 200B. The pair of insulating mechanisms 200A and 200B can be disposed on the exterior of one and the other side of the pole core 20 in the longitudinal direction, one on each side. Because the pole core 20 and... Figures 2 to 6 The pole cores 20 illustrated in the figure are identical with the same reference numerals, so repeated descriptions will be omitted.

[0117] The upper insulating mechanism 200A and the lower insulating mechanism 200B are formed of insulating material and respectively include insulating plates 202A and 202B, anti-deformation parts 220A and 220B, and protrusion retainers 230A and 230B. Each of the insulating plates 202A and 202B is formed in a substantially disc shape and is made of insulating material. The insulating plates 202A and 202B overlap with the pole core 20.

[0118] The insulating plate 202A of the upper insulating mechanism 200A can overlap with the pole core 20 to cover the upper portion 21 of the pole core 20, and the insulating plate 202B of the lower insulating mechanism 200B can overlap with the pole core 20 to cover the lower portion 22 of the pole core 20. The upper insulating mechanism 200A, the pole core 20, and the lower insulating mechanism 200B can be arranged in a straight line along the central axis CX.

[0119] The anti-deformation parts 220A and 220B are formed of insulating material and protrude from the insulating plates 202A and 202B to be fitted into the hollow portion 25 of the pole core 20. The anti-deformation parts 220A and 220B may include a plurality of protrusions 222A and 222B and a plurality of protrusion stops 226A and 226B.

[0120] Through holes 206A and 206B, aligned with the hollow portion 25, can be formed in the central portions of the insulating plates 202A and 202B. Multiple protrusions 222A and 222B can protrude from the inner surfaces of the through holes 206A and 206B to be inserted into the hollow portion 25. The centers of the through holes 206A and 206B can be aligned with the central axis CX.

[0121] In insulating plates 202A and 202B, electrode connection pieces 51 and 53 (see...) Figure 2 The electrode terminals passing through through holes 204A and 204B can be formed outside through holes 206A and 206B.

[0122] The positive electrode contact 51 can pass through the electrode contact through hole 204A of the upper insulating plate 202A and electrically connect the positive electrode plate to the lower cover 37 of the cover assembly 30. The negative electrode contact 53 can pass through the electrode contact through hole 204B of the lower insulating plate 202B and electrically connect the negative electrode plate to the bottom portion 12 of the single-unit housing 11.

[0123] Multiple protrusions 222A and 222B may be arranged along a circular track around the center (i.e., the central axis CX) of the through holes 206A and 206B. The multiple protrusions 222A and 222B may be arranged at equal angular intervals relative to the center CX of the through holes 206A and 206B, and may have a symmetrical shape around the center CX of the through holes 206A and 206B.

[0124] Multiple protrusions 222A and 222B can be formed of insulating material and integrally formed with insulating plates 202A and 202B. Through holes 206A and 206B in insulating plates 202A and 202B can be formed by pressing multiple protrusions 222A and 222B, causing multiple protrusions 222A and 222B to bend from insulating plates 202A and 202B and protrude toward the pole core 20.

[0125] For example, such as Figure 11 and Figure 12 As shown, in insulating plates 202A and 202B, fold lines 210A and 210B can be provided along a circular track around the central axis CX. For example, fold lines 210A and 210B can be formed as recessed grooves in the surfaces of insulating plates 202A and 202B, or as dotted patterns passing through insulating plates 202A and 202B in the thickness direction.

[0126] Additionally, protruding boundaries 212A and 212B extending radially from the central axis CX can be formed in the insulating plates 202A and 202B. The protruding boundaries 212A and 212B can be formed to have a length contacting the fold lines 210A and 210B, or to have a length intersecting the fold lines 210A and 210B and slightly extending from them. The protruding boundaries 212A and 212B can be formed at equal angular intervals.

[0127] For example, the protrusion boundaries 212A and 212B can be formed as cutting lines that pass through the insulating plates 202A and 202B in the thickness direction and extend in a straight line, or as dotted patterns that pass through the insulating plates 202A and 202B at predetermined intervals in the thickness direction.

[0128] When a worker uses their fingers or tools to press the plurality of protrusions 222A and 222B extending parallel to the insulating plates 202A and 202B in a direction parallel to the central axis CX, the plurality of protrusions 222A and 222B can be bent along fold lines 210A and 210B. The plurality of protrusions 222A and 222B can be unfolded such that the ends of the plurality of protrusions 222A and 222B are spaced apart from each other, and through holes 206A and 206B can be formed. Each of the plurality of protrusions 222A and 222B can have an isosceles triangular shape.

[0129] When a plurality of protrusions 222A and 222B extending parallel to the thickness of insulating plates 202A and 202B are pressed in a direction parallel to the thickness of insulating plates 202A and 202B, the plurality of protrusions 222A and 222B unfold along the protrusion boundaries 212A and 212B and form through holes 206A and 206B in insulating plates 202A and 202B.

[0130] When the upper insulating plate 202A is positioned such that the plurality of protrusions 222A of the upper insulating plate 202A are aligned with the hollow portion 25 of the pole core 20 and the plurality of protrusions 222A are pressed toward the pole core 20, the plurality of protrusions 222A can be inserted into the inlet of the hollow portion 25 of the upper end portion 21 of the pole core 20. When the lower insulating plate 202B is positioned such that the plurality of protrusions 222B of the lower insulating plate 202B are aligned with the hollow portion 25 of the pole core 20 and the plurality of protrusions 222B are pressed toward the pole core 20, the plurality of protrusions 222B can be inserted into the inlet of the hollow portion 25 of the lower end portion 22 of the pole core 20.

[0131] Protrusion retainers 230A and 230B can be fitted into through holes 206A and 206B of insulating plates 202A and 202B to retain multiple protrusions 222A and 222B at angles AA and AB relative to insulating plates 202A and 202B. The outer corners of protrusion retainers 230A and 230B can contact the multiple protrusions 222A and 222B. The diameters of protrusion retainers 230A and 230B can be equal to or slightly smaller than the inner diameters of through holes 206A and 206B.

[0132] Each of the protrusion retainers 230A and 230B may be formed of an insulating material. For example, the planar shape of each of the protrusion retainers 230A and 230B may be circular. However, when each of the fold lines 210A and 210B is formed as a polygonal shape such as a hexagon or octagon instead of a circle, the planar shape of each of the protrusion retainers 230A and 230B may be a polygonal shape corresponding to the shape of each of the fold lines 210A and 210B.

[0133] Multiple protruding stops 226A and 226B can protrude from multiple protrusions 222A and 222B in a stepped manner to prevent protrusion retainers 230A and 230B from disengaging from the multiple protrusions 222A and 222B. Each of the protruding stops 226A and 226B can protrude from one of the protrusions 222A and 222B and can be integrally formed with one of the protrusions 222A and 222B. Each of the protruding stops 226A and 226B can be formed of an insulating material.

[0134] The multiple protruding stop portions 226A of the upper insulating mechanism 200A can be located at the same level along the central axis CX, and the multiple protruding stop portions 226B of the lower insulating mechanism 200B can be located at the same level along the central axis CX.

[0135] Because the outer periphery of the protrusion retainers 230A and 230B inserted into the through holes 206A and 206B is supported by multiple protrusion stops 226A and 226B, the protrusion retainers 230A and 230B can maintain their posture without separating and detaching from the multiple protrusions 222A and 222B. Accordingly, the multiple protrusions 222A and 222B can maintain their bending angles AA and AB without being elastically restored.

[0136] Multiple protrusions 222A and 222B are configured to face the inner surface 26 of the hollow portion 25 of the electrode core 20, and to contact and be close to the inner surface 26 of the hollow portion 25 of the electrode core 20. Accordingly, when the battery cell 10 is charged or discharged, the electrode plates constituting the electrode core 20 can expand and contract, and the inner surface 26 of the electrode core 20 can contact the multiple protrusions 222A and 222B. Even when the battery cell 10 is not charged or discharged, the inner surface 26 of the electrode core 20 can still contact the multiple protrusions 222A and 222B.

[0137] Accordingly, deformation of the electrode core 20 (such as folding or bending of the electrode plate) can be prevented in the central portion of the electrode core 20 including the inner surface 26 of the electrode core 20, accidents such as short circuits or voltage drops in the battery cell 10 can be prevented, and the durability of the battery cell 10 can be improved.

[0138] The upper insulation mechanism 200A and the lower insulation mechanism 200B can be assembled by bending multiple protrusions 222A and 222B along fold lines 210A and 210B, and inserting protrusion retainers 230A and 230B into through holes 206A and 206B until they are stopped and supported by multiple protrusion stops 226A.

[0139] With the upper insulating mechanism 200A positioned to overlap with the upper end portion 21 of the pole core 20 and the lower insulating mechanism 200B positioned to overlap with the lower end portion 22 of the pole core 20, the pole core 20, the upper insulating mechanism 200A and the lower insulating mechanism 200B can all be inserted into and installed in the single-unit housing 11.

[0140] However, the above assembly sequence is merely an example, and unlike the example above, the lower insulating mechanism 200B, the pole core 20, and the upper insulating mechanism 200A can be sequentially inserted into and installed in the single-unit housing 11. Alternatively, in the case of the upper insulating mechanism 200A, the upper insulating mechanism 201A can also be installed in the single-unit housing 11 by: arranging the insulating plate 202A of the upper insulating mechanism 200A to overlap with the upper end portion 21 of the pole core 20, so that the hollow portion 25 and the through hole 206A of the pole core 20 are aligned along the central axis CX; pressing and bending the plurality of protrusions 222A and 222B to insert them into the hollow portion 25; and inserting the protrusion retainer 230A into the through hole 206A.

[0141] With the electrode core 20, upper insulation mechanism 200A, and lower insulation mechanism 200B housed within the single-unit housing 11, electrolyte can be injected into the single-unit housing 11, immersing the electrode core 20 in the electrolyte. The electrolyte can permeate into the electrode core 20 not only through its outer surface but also through its inner surface 26. In other words, the electrolyte can be introduced into the hollow portion 25 through through-holes 206A and 206B and permeate into the electrode core 20 through its inner surface 26.

[0142] For example, the length LD2 of the anti-deformation portions 220A and 220B in the direction parallel to the central axis CX can be 1 / 10 to 1 / 3 of the length LR2 of the electrode core 20. Deformation of the inner surface 26 of the electrode core 20 caused by the charging or discharging of the battery cell 10 is easily found in the upper portion 21 and the lower portion 22, but is rarely found in the middle portion between the upper portion 21 and the lower portion 22.

[0143] Correspondingly, when the length LD2 of the anti-deformation parts 220A and 220B is greater than 1 / 3 of the length LR2 of the electrode core 20, the inner surface 26 of the hollow part 25 is excessively blocked by the anti-deformation parts 220A and 220B. Therefore, the anti-deformation effect of the anti-deformation parts 220A and 220B on the electrode core 20 may not be further improved, and the side effect of reducing the diffusion and impregnation speed of the electrolyte may be serious.

[0144] Meanwhile, when the length LD2 of the anti-deformation parts 220A and 220B is less than 1 / 10 of the length LR2 of the pole core 20, the anti-deformation effect of the inner surface 26 of the pole core 20 in the upper part 21 and the lower part 22 may be reduced because the length LD2 of the anti-deformation parts 220A and 120B is too small.

[0145] Reference Figures 7 to 12 In the described insulation mechanisms 200A and 200B, the anti-deformation portions 220A and 220B are only provided on the longitudinal end portions 21 and 22 of the electrode core 20. Accordingly, the entire area of ​​the electrode core 20 can be quickly immersed in the electrolyte. Consequently, the manufacturing productivity of the battery cell 10 can be improved, and the energy efficiency during charging or discharging of the battery cell 10 can be improved.

[0146] At the same time, with Figures 3 to 10 In contrast, an insulation mechanism can be provided in the battery cell 10. In this case, an insulation mechanism can be located at one of the locations on the outside of one end portion 21 and the other end portion 22 of the electrode core 20 in the longitudinal direction.

[0147] Figure 13 This is an example Figure 9A cross-sectional view of a modified example of the upper insulation mechanism illustrated in the figure, and Figure 14 This is an example Figure 10 A cross-sectional view of a modified example of the lower insulation mechanism illustrated in the image. (Instead of...) Figures 7 to 9 The upper insulation mechanism 201A is illustrated in the example. Figure 13 The insulation mechanism 201A illustrated in the diagram can be installed on the battery cell 10 (see...). Figure 2 (in) (replaces) Figure 7 , Figure 8 and Figure 10 The lower insulation mechanism 201B is illustrated in the example. Figure 14 The insulation mechanism 201B illustrated in the figure can be installed on the battery cell 10 (see Figure 2 )middle.

[0148] refer to Figure 7 , Figure 8 , Figure 13 and Figure 14 The upper insulating mechanism 201A and the lower insulating mechanism 201B are formed of insulating material and include insulating plates 203A and 203B, anti-deformation portions 221A and 221B, and protrusion retainers 230A and 230B. Each of the insulating plates 203A and 203B is formed in a substantially disc shape and is made of insulating material. The insulating plates 203A and 203B overlap with the pole core 20.

[0149] The insulating plate 203A of the upper insulating mechanism 201A can overlap with the pole core 20 to cover the upper portion 21 of the pole core 20, and the insulating plate 203B of the lower insulating mechanism 201B can overlap with the pole core 20 to cover the lower portion 22 of the pole core 20. The upper insulating mechanism 201A, the pole core 20, and the lower insulating mechanism 201B can be arranged in a straight line along the central axis CX.

[0150] The anti-deformation parts 221A and 221B are formed of insulating material and protrude from the insulating plates 203A and 203B to be fitted into the hollow portion 25 of the pole core 20. The anti-deformation parts 221A and 221B may include a plurality of protrusions 222A and 222B and a plurality of protrusion stops 226A, 228A, 226B and 228B.

[0151] Through holes 206A and 206B, aligned with the hollow portion 25, can be formed in the central portions of the insulating plates 203A and 203B. Multiple protrusions 222A and 222B can protrude from the inner surfaces of the through holes 206A and 206B to be inserted into the hollow portion 25. The centers of the through holes 206A and 206B can be aligned with the central axis CX. Electrode terminals 51 and 53 (see...) are provided in the insulating plates 203A and 203B. Figure 2 The electrode terminals passing through through holes 204A and 204B can be formed outside through holes 206A and 206B.

[0152] Protrusion retainers 230A and 230B can be fitted into the through holes 206A and 206B of insulating plates 203A and 203B to retain the multiple protrusions 222A and 222B at bending angles AA and AB relative to the insulating plates 203A and 203B, and can contact the multiple protrusions 222A and 222B. Due to the multiple protrusions 222A and 222B and the protrusion retainers 230A and 230B being in contact with a reference... Figures 7 to 12 The plurality of protrusions 222A and 222B included in the described insulating mechanisms 200A and 200B, as well as the protrusion retainers 230A and 230B, are the same and are illustrated by the same reference numerals, so repeated descriptions will be omitted.

[0153] Multiple protruding stops 226A, 228A, 226B, and 228B can protrude from multiple protrusions 222A and 222B in a stepped manner to prevent protrusion retainers 230A and 230B from detaching from the multiple protrusions 222A and 222B. Among the protruding stops 226A, 228A, 226B, and 228B, a pair of protruding stops 226A, 228A, 226B, and 228B can protrude from each of the protrusions 222A and 222B, and can be integrally formed with each of the protrusions 222A and 222B. Each of the protruding stops 226A, 228A, 226B, and 228B can be formed of an insulating material.

[0154] The protruding stop portions 226A, 228A, 226B, and 228B may include first protruding stop portions 226A and 226B and second protruding stop portions 228A and 228B corresponding to the thickness of the protruding retainers 230A and 230B. The first protruding stop portions 226A and 226B may be positioned further away from the insulating plates 203A and 203B than the second protruding stop portions 228A and 228B.

[0155] The upper insulating mechanism 201A has a plurality of first protruding stop portions 226A that can be located at the same level along the central axis CX, and a plurality of second protruding stop portions 228A that can be located at the same level along the central axis CX. The lower insulating mechanism 201B has a plurality of first protruding stop portions 226B that can be located at the same level along the central axis CX, and a plurality of second protruding stop portions 228B that can be located at the same level along the central axis CX.

[0156] Since the outer peripheral portions of the protrusion retainers 230A and 230B, which are inserted into the through holes 206A and 206B, are fitted into and supported by the gaps between the plurality of first protrusion stops 226A and 226B and the plurality of second protrusion stops 228A and 228B, therefore Figure 13 and Figure 14 The protruding retainers 230A and 230B of the insulating mechanisms 201A and 201B illustrated in the figure can be compared with Figure 9 and Figure 10 The protrusion retainers 230A and 230B of the illustrated insulation mechanisms 200A and 200B more reliably maintain their orientation without separating and detaching from the plurality of protrusions 222A and 222B. Accordingly, the plurality of protrusions 222A and 222B can maintain bending angles AA and AB without being elastically restored.

[0157] like Figure 13 and Figure 14 As illustrated by the double-dotted lines, when the multiple protrusions 222A and 222B are bent slightly beyond bending angles AA and AB, and the protrusion retainers 230A and 230B are located at the level of the gap between the multiple first protrusion stops 226A and 226B and the multiple second protrusion stops 228A and 228B, and the force applied to the multiple protrusions 222A and 222B is released, the multiple protrusions 222A and 222B elastically return to the posture illustrated by the solid lines, and the protrusion retainers 230A and 230B are fitted into and supported by the gap between the multiple first protrusion stops 226A and 226B and the multiple second protrusion stops 228A and 228B. Accordingly, the bending angles AA and AB of the multiple protrusions 222A and 222B can be maintained.

[0158] The invention has been described above using only some embodiments and figures, but the invention is not limited thereto, and of course, those skilled in the art can make various modifications and changes within the spirit of the invention and within the scope equivalent to the following claims.

Claims

1. A single battery cell, comprising: Monolithic shell; An electrode core is formed by winding an electrode assembly and housed in the single-unit housing, and a hollow portion extending in the longitudinal direction is formed in the electrode core; as well as The insulation mechanism includes an insulating plate that overlaps with the pole core and a deformation-resistant portion that protrudes from the insulating plate to be fitted into the hollow portion of the pole core.

2. The battery cell according to claim 1, wherein the insulation mechanism is disposed at one of the locations on the outside of one side and the other side of the electrode core in the longitudinal direction.

3. The battery cell according to claim 1, wherein: The insulating mechanism is provided as a pair of insulating mechanisms; and The pair of insulating mechanisms are disposed on the outside of the pole core on one and the other side in the longitudinal direction, one on each side.

4. The battery cell according to claim 1, wherein the length of the anti-deformation portion is 1 / 10 to 1 / 3 of the length of the electrode core.

5. The battery cell according to claim 1, wherein the anti-deformation portion comprises a tube extending in the longitudinal direction of the electrode core.

6. The battery cell according to claim 5, wherein the diameter of the tube decreases as it moves away from the insulating plate.

7. The battery cell according to claim 5, wherein: A through-hole is formed in the insulating plate, and the tube passes through the through-hole; and The anti-deformation portion further includes a flange that extends to bend from the tube in the radial direction.

8. The battery cell according to claim 7, wherein a flange mounting groove is formed around the through hole, and the flange is fixed in the flange mounting groove.

9. The battery cell according to claim 1, wherein: The insulating plate includes a through hole aligned with the hollow portion of the pole core; and The anti-deformation part includes a plurality of protrusions that protrude from the inner surface of the through hole in the insulating plate and are inserted into the hollow part.

10. The battery cell of claim 9, wherein the plurality of protrusions are arranged at equal intervals around the center of the through hole in the insulating plate.

11. The battery cell according to claim 9, wherein the plurality of protrusions are symmetrically arranged around the center of the through hole of the insulating plate.

12. The battery cell according to claim 9, wherein: The plurality of protrusions are integrally formed with the insulating plate; and The through-hole of the insulating plate is formed by pressing the plurality of protrusions to make the plurality of protrusions protrude from the insulating plate.

13. The battery cell of claim 12, wherein the plurality of protrusions are bent along a fold line provided on the insulating plate.

14. The battery cell of claim 13, wherein the folded line has a circular or polygonal shape centered on the center of the through hole in the insulating plate.

15. The battery cell of claim 13, wherein a protruding boundary line extending radially from the center of the through hole in the insulating plate and contacting the fold line is formed in the insulating plate.

16. The battery cell according to claim 15, wherein, When the plurality of protrusions extending parallel to the insulation plate are pressed in a direction parallel to the thickness of the insulation plate, the plurality of protrusions unfold along the boundary line of the protrusions. And form the through hole in the insulating plate.

17. The battery cell of claim 13, wherein the insulation mechanism further comprises a protrusion retainer, the protrusion retainer being fitted into the through hole of the insulation plate and contacting the plurality of protrusions.

18. The battery cell of claim 17, wherein the planar shape of the protrusion retainer is a shape corresponding to the shape of the fold line.

19. The battery cell of claim 17, wherein the anti-deformation portion further comprises a protrusion stop portion, the protrusion stop portion protruding from the protrusion in a stepped shape and blocking the protrusion retainer.

20. The battery cell according to claim 19, wherein: The protruding member stop includes a first protruding member stop and a second protruding member stop, the first protruding member stop and the second protruding member stop being spaced apart from each other by a distance corresponding to the thickness of the protruding member retainer; and The outer peripheral portion of the protrusion retainer is fitted into the gap between the first protrusion stop and the second protrusion stop.

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