Mandrel for winding electrode of secondary battery

Abstract

The present disclosure provides a mandrel for winding an electrode of a secondary battery, the mandrel including: a first mandrel member including a plurality of first longitudinal side portions including first longitudinal side surfaces and a first surface, in which a first hollow portion is provided between the plurality of first longitudinal side portions; and a second mandrel member spaced apart from the first mandrel member and including a second plurality of longitudinal side portions including a second longitudinal side surface and a second surface, where a second hollow portion is provided between the second plurality of longitudinal side portions. According to the invention, passing of ions generated by first and second tip portions of a first mandrel member and third and fourth tip portions of a second mandrel member and eliminating static electricity through first and second through-hole portions of a first mandrel member and third and fourth through-hole portions of a second mandrel member Thus, the entire mandrel for winding the electrode of the secondary battery may have a function of eliminating static electricity.

Description

Technical Field

[0001] This disclosure relates to a mandrel for winding electrodes in a secondary battery. Background Technology

[0002] In general, with the rapid proliferation of battery-powered electronic devices such as mobile phones, laptops, and electric vehicles, the demand for rechargeable batteries with high energy density and high capacity is also increasing rapidly.

[0003] Secondary batteries are formed in such a way that the electrode assembly is formed by winding or stacking a positive electrode, a negative electrode, and a separator between the positive and negative electrodes, and is sealed together with the electrolyte in a can, bag, or the like.

[0004] The information disclosed herein in the context of the art that forms the background of this disclosure is provided to enhance the understanding of the context of this disclosure, and therefore may include information that does not constitute related art. Summary of the Invention

[0005] This disclosure aims to provide a mandrel capable of eliminating static electricity for winding electrodes of a secondary battery.

[0006] These and other aspects and features of this disclosure will be described in the following description of embodiments of this disclosure, or will become apparent from the following description of some embodiments of this disclosure.

[0007] A mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure for solving the technical problem herein includes: a first mandrel member including a plurality of first longitudinal side portions, the plurality of first longitudinal side portions including a first longitudinal side surface and a first surface, wherein a first hollow portion is provided between the plurality of first longitudinal side portions; and a second mandrel member spaced apart from the first mandrel member, the second mandrel member including a plurality of second longitudinal side portions, the plurality of second longitudinal side portions including a second longitudinal side surface and a second surface facing the first surface, wherein a second hollow portion is provided between the plurality of second longitudinal side portions.

[0008] The first longitudinal portions of the first mandrel member may include: a first flat portion having a first flat surface intersecting the first surface and including a first through-hole portion; and a second flat portion having a second flat surface intersecting the first surface, spaced apart from and facing the first flat portion, and including a second through-hole portion.

[0009] The first mandrel member may further include a first pointed portion that protrudes from the first flat portion and is received in the first hollow portion.

[0010] The first pointed portion may not contact the second flat portion, and may have a width that decreases toward the second flat portion.

[0011] The first mandrel member may further include a second pointed portion that protrudes from the second flat portion and is received in the first hollow portion.

[0012] The second pointed portion may not contact the first flat portion, and may have a width that decreases toward the first flat portion.

[0013] The first tip portion may include multiple first tip portions, the second tip portion may include multiple second tip portions, and the multiple first tip portions and multiple second tip portions may be configured to be spaced apart from each other along the longitudinal direction of the first mandrel member.

[0014] Multiple first tip portions and second tip portions can be arranged in an alternating manner.

[0015] The plurality of first longitudinal side portions of the first mandrel member may further include a first inclined portion having a first inclined surface extending obliquely from a first flat surface and a second inclined portion having a second inclined surface extending obliquely from a second flat surface and connected to the first inclined surface.

[0016] The interior angle between the first flat surface and the first inclined surface can form an obtuse angle, and the interior angle between the second flat surface and the second inclined surface can also form an obtuse angle.

[0017] The plurality of second longitudinal side portions of the second mandrel member may include: a third flat portion having a third flat surface intersecting the second surface and including a third through-hole portion; and a fourth flat portion having a fourth flat surface intersecting the second surface, spaced apart from and facing the third flat portion, and including a fourth through-hole portion.

[0018] The second mandrel member may further include a third pointed portion that protrudes from the third flat portion and is received in the second hollow portion.

[0019] The third tip portion may not contact the fourth flat portion, and may have a width that decreases toward the fourth flat portion.

[0020] The second mandrel member may further include a fourth tip portion that protrudes from the fourth flat portion and is received in the second hollow portion.

[0021] The fourth tip portion may not contact the third flat portion, and may have a width that decreases toward the third flat portion.

[0022] The third tip portion may include multiple third tip portions, the fourth tip portion may include multiple fourth tip portions, and the multiple third tip portions and multiple fourth tip portions may be configured to be spaced apart from each other along the longitudinal direction of the second mandrel member.

[0023] Multiple third and fourth tip portions can be arranged in an alternating manner.

[0024] The plurality of second longitudinal side portions of the second mandrel member may further include a third inclined portion having a third inclined surface extending obliquely from the third flat surface and a fourth inclined portion having a fourth inclined surface extending obliquely from the fourth flat surface and connected to the third inclined surface.

[0025] The interior angle between the third flat surface and the third inclined surface can form an obtuse angle, and the interior angle between the fourth flat surface and the fourth inclined surface can also form an obtuse angle. Attached Figure Description

[0026] The accompanying drawings illustrate some embodiments of the present disclosure and further describe aspects and features of the disclosure together with its detailed description. However, this disclosure should not be construed as limited to the drawings.

[0027] Figure 1 This is a schematic top perspective view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure.

[0028] Figure 2 This is a schematic illustration of a bottom perspective view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure.

[0029] Figure 3 This is a schematic front perspective view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure.

[0030] Figure 4 It is viewed from another direction. Figure 3 A front perspective view of the mandrel used to wind the electrodes of a secondary battery.

[0031] Figure 5 This is a schematic front view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure.

[0032] Figure 6 This is a schematic illustration of a side surface view of a first mandrel member according to one embodiment of the present disclosure;

[0033] Figure 7 This is a schematic illustration of a side surface view of a second mandrel member according to one embodiment of the present disclosure; and

[0034] Figures 8 to 10 These are schematic views illustrating various embodiments of the first tip portion, second tip portion, third tip portion, and fourth tip portion according to one embodiment of the present disclosure. Detailed Implementation

[0035] In this document, embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts consistent with the technical spirit of the present disclosure, based on the principle that the inventor himself can be a lexicographer to appropriately define the concepts of the terms.

[0036] The embodiments described in this specification and the constructions shown in the accompanying drawings are provided as some exemplary embodiments of this disclosure and do not necessarily represent all the technical ideas, aspects, and features of this disclosure. Accordingly, it should be understood that various equivalents and modifications are possible at the time of filing this application, which can replace or modify the embodiments described herein.

[0037] It is important to understand that when an element or layer is referred to as being "on" another element or layer, "connected to," or "linked to" another element or layer, it can be directly on, directly connected to, or linked to that other element or layer, or there may be one or more intermediary elements or layers. When an element or layer is referred to as being "directly on" another element or layer, "directly connected to," or "directly linked to" another element or layer, there are no intermediary elements or layers. For example, when a first element is described as being "linked" or "connected" to a second element, the first element can be directly linked or connected to the second element, or the first element can be indirectly linked or connected to the second element via one or more intermediary elements.

[0038] In the accompanying drawings, the dimensions of various elements, layers, etc., may be exaggerated for clarity of illustration. The same reference numerals denote the same or similar elements. 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" in describing embodiments of this disclosure refers to "one or more embodiments of this disclosure." When expressions such as "at least one of..." and "any one of..." follow a list of elements, they modify the entire list of elements, not individual elements within the list. When a list of elements A, B, and C is indicated by terms such as "at least one of A, B, and C," "at least one selected from the group of A, B, and C," or "at least one selected from A, B, and C," the term may refer to any and all suitable combinations or suitable subsets of A, B, and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the term "use" and variations thereof may be considered synonymous with the term "utilize" and variations thereof, respectively. As used herein, the terms “substantially,” “about,” and similar terms are used as approximations rather than terms of degree, and are intended to explain the inherent variations in measured or calculated values ​​that will be recognized by one of ordinary skill in the art.

[0039] It should be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions are not limited by these terms. These terms are used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion without departing from the teachings of the exemplary embodiments.

[0040] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein to describe the relationship between one element or feature and another element(s) illustrated in the figures. It is to be understood that these spatial relative terms are intended to cover different orientations of the device in use or operation, in addition to those described in the figures. For example, if the device in the figures is flipped, the element described as “below” or “under” other elements will then be oriented “above” or “above” that other element or feature. Thus, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptors used herein should be interpreted accordingly.

[0041] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit the disclosure. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It is to be further understood that, when used in this specification, the term “comprising” and variations thereof indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof.

[0042] Furthermore, any numerical ranges disclosed and / or enumerated herein are intended to include all subranges with the same numerical precision that are incorporated within the enumerated ranges. For example, the range “1.0 to 10.0” is intended to include all subranges between (and including) the enumerated minimum value of 1.0 and the enumerated maximum value of 10.0, i.e., all subranges with a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit enumerated herein is intended to include all lower numerical limits incorporated therein, and any minimum numerical limit enumerated herein is intended to include all higher numerical limits incorporated therein. Accordingly, the applicant reserves the right to amend this specification (including the claims) to expressly enumerate any subranges incorporated within the scope expressly enumerated herein.

[0043] Referring to two compared elements, features, etc., as “identical” can mean that they are “identical or substantially identical.” Therefore, the terms “identical” or “substantially identical” can include cases where there is a deviation considered low in the art (e.g., less than 5%). Furthermore, when a parameter is said to be uniform in a given region, this can mean that it is uniform in terms of average value.

[0044] Throughout the instruction manual, unless otherwise stated, each element may be singular or plural.

[0045] When any element is described as being arranged (or located or positioned) "above (or below)" or "on top (or below)" a component, this can mean that the element is located in contact with the upper (or lower) surface of the component, and it can also mean that another component can be inserted between the component and any element arranged (or located or positioned) on (or below) the component.

[0046] Furthermore, it should be understood that when an element is referred to as being “connected,” “linked,” or “attached” to another element, these elements may be directly “connected,” “linked,” or “attached” to each other, or one or more intermediary elements may exist between them (the element may be “connected,” “linked,” or “attached” to the other element through the intermediary element). Additionally, when a part is referred to as being “electrically connected” to another part, the part may be directly electrically connected to the other part, or one or more intermediary parts may exist between them, such that the part and the other part are indirectly electrically connected to each other.

[0047] Throughout the specification, unless otherwise stated, when “A and / or B” is mentioned, it means A, B, or A and B. That is, “and / or” includes any or all combinations of the listed items. Unless otherwise stated, when “C to D” is mentioned, it means C and below D.

[0048] The terminology used in this specification is for describing embodiments of this disclosure and is not intended to limit this disclosure.

[0049] A wound electrode assembly is constructed by winding an electrode plate onto a mandrel that serves as the winding center, and then separating the mandrel. After winding, the mandrel should be separated from the electrode assembly without damaging it. Accordingly, a mandrel in which the electrode assembly can be smoothly separated and released must be provided.

[0050] Figure 1 This is a schematic top perspective view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure. Figure 2 This is a schematic bottom perspective view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure. Figure 3 This is a schematic front perspective view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure. Figure 4 It is viewed from another direction. Figure 3 A front perspective view of the mandrel used for winding the electrodes of a secondary battery, and Figure 5 This is a schematic front view of a mandrel for winding electrodes of a secondary battery according to one embodiment of the present disclosure.

[0051] refer to Figures 1 to 5 According to embodiments of the present disclosure, the mandrel 1 for winding electrodes of a secondary battery may include a first mandrel member 100 and a second mandrel member 200.

[0052] The mandrel 1 for winding the electrodes of the secondary battery according to the embodiment can be used to wind the electrodes of the secondary battery. The mandrel 1 for winding the electrodes of the secondary battery can be used to manufacture electrode assemblies. The secondary battery can be used as a unit structure for storing and supplying electricity in a battery module or battery pack.

[0053] The secondary battery can be a cylindrical battery such as a lithium-ion secondary battery, but is not limited thereto, and in some embodiments, the secondary battery can be a lithium polymer battery, a prismatic battery or a pouch battery.

[0054] Electrode assemblies can be used as unit structures in secondary batteries to perform charging and discharging operations. The electrode assembly can be formed with a core shape, which is wound around a winding axis in a clockwise or counterclockwise direction with the positive electrode, separator, and negative electrode stacked.

[0055] The first mandrel member 100 and the second mandrel member 200 are configured to be spaced apart from each other by a predetermined distance, and the end of the electrode plate can be inserted between the first mandrel member 200 and the second mandrel member 100.

[0056] According to the embodiment, with the positive electrode, negative electrode and separator between the first mandrel member 100 and the second mandrel member 200, when the first mandrel member 200 and the second mandrel member 100 rotate together, the electrode plate can surround the outer surface of the mandrel 1 for winding the electrodes of the secondary battery.

[0057] based on Figure 1 and Figure 2 The first direction described herein is parallel to the X-axis and can refer to the longitudinal direction of the first mandrel member 100 and the second mandrel member 200. Based on Figure 1 and Figure 2 The second direction is parallel to the Y-axis and can refer to the width direction of the first mandrel member 100 and the second mandrel member 200. Based on Figure 1 and Figure 2 The third direction is parallel to the Z-axis and can refer to the height direction of the first mandrel member 100 and the second mandrel member 200.

[0058] Figure 6 This is a schematic illustration of a side surface view of a first mandrel member according to one embodiment of the present disclosure.

[0059] refer to Figures 1 to 6 According to the embodiment, the first mandrel member 100 can be formed in such a shape that the ends of the two first longitudinal side portions 100b parallel to the first direction are open, and the first surface 101 orthogonally disposed to the two first longitudinal side portions 100b is open.

[0060] The first surface 101 can form one side of the first mandrel member 100 (based on...) Figure 1 The appearance of the right side). The first surface 101 of the first mandrel member 100 may be oriented toward the direction where the second mandrel member 200 is located.

[0061] The first mandrel member 100 can be formed in such a structure that two first longitudinal side portions 100b and a first surface 101 are continuously connected.

[0062] The first mandrel member 100 can be formed as a hollow shape with an empty interior. A first hollow portion 100a can be provided in the first mandrel member 100. The first hollow portion 100a can be referred to as the internal space of the first mandrel member 100.

[0063] The first spindle member 100 can be formed in such a structure that a plurality of first longitudinal side portions 100b are continuously connected and a first hollow portion 100a can be provided between the plurality of first longitudinal side portions.

[0064] According to an embodiment, a plurality of first longitudinal side portions of the first mandrel member 100 may include a first flat portion 102 and a second flat portion 103.

[0065] The first flat portion 102 may have a first flat surface. The first flat surface may form the upper side of the first mandrel member 100 (based on...). Figure 1 The appearance of the first flat surface may be intersecting with the first surface 101. The first flat portion 102 may have a rectangular plate shape, wherein the length parallel to the second direction is shorter than the length parallel to the first direction.

[0066] The first flat portion 102 may include a first through-hole portion 102a. The first through-hole portion 102a may be formed through the first flat portion 102 in the thickness direction. The first through-hole portion 102a may be formed through the first flat portion 102 in a direction parallel to a third direction.

[0067] Multiple first through-hole portions 102a may be configured to be spaced apart from each other along a longitudinal direction parallel to the first direction of the first flat portion 102.

[0068] Ions generated by the first tip portion 110 and / or the second tip portion 120 and destatically neutralized can be discharged to the electrostatic target through the first through-hole portion 102a communicating with the first hollow portion 100a.

[0069] The second flat portion 103 may have a second flat surface. The second flat surface may form the lower side of the first mandrel member 100 (based on...). Figure 1The second flat surface may be disposed intersecting with the first surface 101. The second flat portion 103 may be rectangular plate-shaped, wherein the length parallel to the second direction is shorter than the length parallel to the first direction.

[0070] The second flat portion 103 may be spaced apart from and face the first flat portion 102. The second flat portion 103 may be configured to be spaced apart from the first flat portion 102 in a direction opposite to the third direction.

[0071] The first flat portion 102 and the second flat portion 103 may be arranged facing each other. The first flat portion 102 and the second flat portion 103 may be arranged parallel to each other.

[0072] The areas of the first flat surface and the second flat surface can be the same. The first flat surface and the second flat surface can have the same length parallel to the first direction and the same length parallel to the second direction.

[0073] The lengths of the first and second flat surfaces parallel to the first direction can be the same as the length of the first surface parallel to the first direction. The area of ​​the first surface can be smaller than the areas of the first and second flat surfaces.

[0074] The second flat portion 103 may include a second through-hole portion 103a. The second through-hole portion 103a may be formed through the second flat portion 103 in the thickness direction. The second through-hole portion 103a may be formed through the second flat portion 103 in a direction parallel to a third direction.

[0075] The plurality of second through-hole portions 103a may be configured to be spaced apart from each other along a longitudinal direction parallel to the first direction of the first mandrel member 100. More specifically, the plurality of second through-hole portions 103a may be configured to be spaced apart from each other along the longitudinal direction of the second flat portion 103.

[0076] Ions generated by the first tip portion 110 and / or the second tip portion 120 and destatically neutralized can be discharged to the electrostatic target through the second through-hole portion 103a, which is connected to the first hollow portion 100a.

[0077] According to the embodiment, the second through-hole portion 103a can be provided at a position corresponding to the first through-hole portion 102a. Specifically, the central axis of the first through-hole portion 102a and the central axis of the second through-hole portion 103a can be provided on the same axis so that they coincide with each other. In another embodiment, the central axis of the first through-hole portion 102a and the central axis of the second through-hole portion 103a can be provided parallel so that they do not coincide with each other.

[0078] The first mandrel component 100 according to the embodiment may include a first tip portion 110.

[0079] A first pointed portion 110 may be provided on and protrude from the first flat portion 102. The first pointed portion 110 may extend from the first flat portion 102 in a direction opposite to that of the second flat portion 103. The first pointed portion 110 may be accommodated in the first hollow portion 100a.

[0080] The plurality of first tip portions 110 may be configured to be spaced apart from each other along a longitudinal direction parallel to a first direction of the first mandrel member 100. The plurality of first tip portions 110 may be configured to be spaced apart from each other along a longitudinal direction of the first flat portion 102.

[0081] The first pointed portion 110 may not contact the second flat portion 103. The first pointed portion 110 may have a shape in which its width decreases towards the end. For example, the first pointed portion 110 may have a triangular shape in which its width decreases towards the end where the vertex is located (i.e., towards the second flat portion 103). However, this disclosure is not limited thereto, and in addition to Figure 3 and Figure 4 In addition to the triangle shown, the first apex portion 110 may also have multiple such... Figure 8 The end shown, or when having a pointed shape, the first pointed portion 110 can be designed to have, as shown in the figure, Figure 9 and Figure 10 The various shapes shown.

[0082] According to the embodiment, the first tip portion 110 may include a conductive material and may be electrically connected to a power source. Because a high voltage generated from the power source can be applied to the first tip portion 110, corona discharge may occur at the end of the first tip portion 100. Accordingly, because the air surrounding the first tip portion 110 becomes ionized, the first mandrel member 100 may have the function of eliminating static electricity.

[0083] The first mandrel member 100 according to the embodiment may further include a second tip portion 120.

[0084] The second pointed portion 120 may be provided on and protrude from the second flat portion 103. The second pointed portion 120 may extend upward from the second flat portion 103 on a third side. The second pointed portion 120 may be accommodated in the first hollow portion 100a.

[0085] The second pointed portion 120 may not contact the first flat portion 102. The second pointed portion 120 may have a shape in which its width decreases towards the end. For example, the second pointed portion 120 may have a triangular shape in which its width decreases towards the end where the vertex is located (i.e., towards the first flat portion 102). However, this disclosure is not limited thereto, and in addition to Figure 3 and Figure 4 In addition to the triangle shown, the second apex portion 120 may also have multiple such... Figure 8 The end shown, or when having a pointed shape, the second pointed portion 120 can be designed to have, as shown in the figure, the second pointed portion 120. Figure 9 and Figure 10 The various shapes shown.

[0086] The second tip portion 120 according to the embodiment may include a conductive material and may be electrically connected to a power source. Because a high voltage generated from the power source can be applied to the second tip portion 120, corona discharge may occur at the tip of the second tip portion 120. Accordingly, because the air surrounding the second tip portion 120 becomes ionized, the first mandrel member 100 may have the function of eliminating static electricity.

[0087] The plurality of second tip portions 120 may be configured to be spaced apart from each other along a longitudinal direction parallel to the first direction of the first mandrel member 100. The plurality of second tip portions 120 may be configured to be spaced apart from each other along the longitudinal direction of the second flat portion 103.

[0088] According to the embodiment, the first tip portion 110 and the second tip portion 120 can be arranged alternately. The first tip portion 110 and the second tip portion 120 can be spaced apart from each other and can be arranged alternately along the longitudinal direction of the first mandrel member 100 parallel to the first direction.

[0089] According to the embodiment, the plurality of first longitudinal portions of the first mandrel member 100 may further include a first inclined portion 104 and a second inclined portion 105.

[0090] The first inclined portion 104 and the second inclined portion 105 may have a shape that protrudes in the width direction of the first mandrel member 100.

[0091] The first inclined portion 104 may have a first inclined surface extending from the first flat portion 102. The first inclined portion 104 may extend from the first flat portion 102 at an angle in an inclined manner toward a direction opposite to the second direction. The interior angle θ1 between the first flat surface and the first inclined surface may form an obtuse angle.

[0092] The second inclined portion 105 may have a second inclined surface extending from the second flat portion 103. The second inclined portion 105 may extend at an angle from the second flat portion 103 in a direction opposite to the second direction. The interior angle θ2 between the second flat surface and the second inclined surface may form an obtuse angle. The second inclined portion 105 may be connected to the first inclined portion 104.

[0093] The interior angle θ1 between the first flat surface and the first inclined surface, and the interior angle θ2 between the second flat surface and the second inclined surface, can be the same.

[0094] According to the embodiment, the second mandrel member 200 may be spaced apart from the first mandrel member 100. The second mandrel member 200 may be configured to be spaced apart from the first mandrel member 100 along a second direction.

[0095] The first mandrel member 100 and the second mandrel member 200 may be arranged parallel to each other in a first direction.

[0096] Figure 7 This is a schematic illustration of a side surface view of a second mandrel member according to one embodiment of the present disclosure.

[0097] refer to Figures 1 to 5 as well as Figure 7 According to the embodiment, the second mandrel member 200 can be formed in such a shape that the ends of the two second longitudinal side portions 200b parallel to the first direction are open, and the second surface 201 orthogonally disposed to the two second longitudinal side portions 200b is open.

[0098] The second surface 201 can form one side of the second mandrel member 200 (based on...) Figure 1 The appearance of the left side). The second surface 201 of the second mandrel member 200 may be arranged toward the direction where the first mandrel member 100 is located. The first surface 101 of the first mandrel member 100 and the second surface 201 of the second mandrel member 200 may be arranged facing each other.

[0099] The second spindle member 200 can be formed in such a structure that the two second longitudinal side portions 200b and the second surface 201 are connected without being separated.

[0100] The second mandrel member 200 can be formed as a hollow shape with an empty interior. A second hollow portion 200a can be provided in the second mandrel member 200. The second hollow portion 200a can be referred to as the internal space of the second mandrel member 200.

[0101] The second spindle member 200 can be formed in such a structure that a plurality of second longitudinal side portions are continuously connected and a second hollow portion 200a can be provided between the plurality of second longitudinal side portions.

[0102] According to the embodiment, the second mandrel member 200 may include a third flat portion 202 and a fourth flat portion 203.

[0103] The third flat portion 202 may have a third flat surface. The third flat surface may form the upper side of the second mandrel member 200 (based on...). Figure 1 The appearance of the third flat surface. The third flat portion 202 may be arranged intersecting with the second surface 201. The third flat portion 202 may be rectangular plate-shaped, wherein the length parallel to the second direction is shorter than the length parallel to the first direction.

[0104] The third flat portion 202 may include a third through-hole portion 202a. The third through-hole portion 202a may be formed through the third flat portion 202 in the thickness direction. The third through-hole portion 202a may be formed through the third flat portion 202 in a direction parallel to the third third direction.

[0105] Multiple third through-hole portions 202a can be configured to be spaced apart from each other along a longitudinal direction parallel to the first direction of the third flat portion 202.

[0106] Ions generated by the third tip portion 210 and / or the fourth tip portion 220 and destatically eliminated can be discharged to the electrostatic target through the third through-hole portion 202a communicating with the second hollow portion 200a.

[0107] The fourth flat portion 203 may have a fourth flat surface. This fourth flat surface may form the lower side of the second mandrel member 200 (based on...). Figure 1 The fourth flat surface may be disposed intersecting with the second surface 201. The fourth flat portion 203 may have a rectangular plate shape, wherein the length parallel to the second direction is shorter than the length parallel to the first direction.

[0108] The fourth flat portion 203 may be spaced apart from and face the third flat portion 202. The fourth flat portion 203 may be configured to be spaced apart from the third flat portion 202 in a direction opposite to that of the third.

[0109] The third flat portion 202 and the fourth flat portion 203 can be arranged facing each other. The third flat portion 202 and the fourth flat portion 203 can be arranged parallel to each other.

[0110] The third and fourth flat surfaces can have the same area. The third and fourth flat surfaces can also have the same length parallel to the first direction and the same length parallel to the second direction.

[0111] The lengths of the third and fourth flat surfaces parallel to the first direction can be the same as the length of the second surface parallel to the first direction. The area of ​​the second surface can be smaller than the areas of the third and fourth flat surfaces.

[0112] The fourth flat portion 203 may include a fourth through-hole portion 203a. The fourth through-hole portion 203a may be formed through the fourth flat portion 203 in the thickness direction. The fourth through-hole portion 203a may be formed through the fourth flat portion 203 in a direction parallel to the third direction.

[0113] The plurality of fourth through-hole portions 203a may be configured to be spaced apart from each other along a longitudinal direction of the second mandrel member 200 parallel to the first direction. More specifically, the plurality of fourth through-hole portions 203a may be configured to be spaced apart from each other along the longitudinal direction of the fourth flat portion 203.

[0114] Ions generated by the third tip portion 210 and / or the fourth tip portion 220 and destatically neutralized can be discharged to the electrostatic target through the fourth through-hole portion 203a, which is connected to the second hollow portion 200a.

[0115] According to the embodiment, the fourth through-hole portion 203a can be provided at a position corresponding to the third through-hole portion 202a. Specifically, the central axis of the third through-hole portion 202a and the central axis of the fourth through-hole portion 203a can be provided on the same axis so that they coincide with each other. In another embodiment, the central axis of the third through-hole portion 202a and the central axis of the fourth through-hole portion 203a can be provided parallel so that they do not coincide with each other.

[0116] The second mandrel member 200 according to the embodiment may include a third tip portion 210.

[0117] The third pointed portion 210 may be provided on and protrude from the third flat portion 202. The third pointed portion 210 may extend from the third flat portion 202 in a direction opposite to that of the fourth flat portion 203. The third pointed portion 210 may be accommodated in the second hollow portion 200a.

[0118] The plurality of third tip portions 210 may be configured to be spaced apart from each other along a longitudinal direction parallel to the first direction of the second mandrel member 200. The plurality of third tip portions 210 may be configured to be spaced apart from each other along a longitudinal direction of the third flat portion 202.

[0119] The third pointed portion 210 may not contact the fourth flat portion 203. The third pointed portion 210 may have a shape in which its width decreases towards the end. For example, the third pointed portion 210 may have a triangular shape in which its width decreases towards the end where the vertex is located (i.e., towards the fourth flat portion 203). However, this disclosure is not limited thereto, and in addition to Figure 3 and Figure 4 In addition to the triangle shown, the third apex portion 210 may also have multiple such... Figure 8 The end shown, or when having a pointed shape, the third pointed portion 210 can be designed to have, as shown in the figure, Figure 9 and Figure 10 The various shapes shown.

[0120] The third tip portion 210 according to the embodiment may include a conductive material and may be electrically connected to a power source. Because a high voltage generated from the power source can be applied to the third tip portion 210, corona discharge may occur at the tip of the third tip portion 210. Accordingly, because the air surrounding the third tip portion 210 becomes ionized, the second mandrel member 200 may have the function of eliminating static electricity.

[0121] The second mandrel member 200 according to the embodiment may further include a fourth tip portion 220.

[0122] A fourth pointed portion 220 may be provided on and protrude from the fourth flat portion 203. The fourth pointed portion 220 may extend upward from the fourth flat portion 203 on a third party. The fourth pointed portion 220 may be accommodated in the second hollow portion 200a.

[0123] The fourth pointed portion 220 may not contact the third flat portion 202. The fourth pointed portion 220 may have a shape in which its width decreases towards its end. For example, the fourth pointed portion 220 may have a triangular shape, with its width decreasing towards the end where the vertex is located (i.e., towards the third flat portion 202). However, this disclosure is not limited thereto, and may include, in addition to… Figure 3 and Figure 4 In addition to the triangle shown, the fourth apex portion 220 may also have multiple such... Figure 8 The end shown, or when having a pointed shape, the fourth tip portion 220 can be designed to have, as shown, the end portion shown. Figure 9 and Figure 10 The various shapes shown.

[0124] The fourth tip portion 220 according to the embodiment may include a conductive material and is electrically connected to a power source. Because a high voltage generated from the power source can be applied to the fourth tip portion 220, corona discharge can occur at the tip of the fourth tip portion 220. Accordingly, because the air surrounding the fourth tip portion 220 becomes ionized, the second mandrel member 200 can have the function of eliminating static electricity.

[0125] The plurality of fourth tip portions 220 may be configured to be spaced apart from each other along a longitudinal direction parallel to the first direction of the second mandrel member 200. The plurality of fourth tip portions 220 may be configured to be spaced apart from each other along a longitudinal direction of the fourth flat portion 203.

[0126] According to the embodiment, the third tip portion 210 and the fourth tip portion 220 can be arranged alternately. The third tip portion 210 and the fourth tip portion 220 can be spaced apart from each other and can be arranged alternately along the longitudinal direction of the second mandrel member 200 parallel to the first direction.

[0127] According to the embodiment, the plurality of second longitudinal side portions of the second mandrel member 200 may further include a third inclined portion 204 and a fourth inclined portion 205.

[0128] The third inclined portion 204 and the fourth inclined portion 205 may have a shape that protrudes in the width direction of the second mandrel member 200.

[0129] The third inclined portion 204 may have a third inclined surface extending from the third flat portion 202. The third inclined portion 204 may extend at a set angle from the third flat portion 202 toward a second direction in an inclined manner. The interior angle θ3 between the third flat surface and the third inclined surface may form an obtuse angle.

[0130] The fourth inclined portion 205 may have a fourth inclined surface extending from the fourth flat portion 203. The fourth inclined portion 205 may extend at an angle from the fourth flat portion 203 toward a second direction in an inclined manner. The interior angle θ4 between the fourth flat surface and the fourth inclined surface may form an obtuse angle. The fourth inclined portion 203 may be connected to the third inclined portion 204.

[0131] The interior angle θ3 between the third flat surface and the third inclined surface, and the interior angle θ4 between the fourth flat surface and the fourth inclined surface, can be the same.

[0132] According to one embodiment of this disclosure, since ions generated by the first and second tip portions of the first mandrel member and the third and fourth tip portions of the second mandrel member, which eliminate static electricity, discharge through the first and second through-hole portions of the first mandrel member and the third and fourth through-hole portions of the second mandrel member, the entire mandrel used for winding the electrodes of the secondary battery can have the function of eliminating static electricity.

[0133] However, the effects that can be obtained through this disclosure are not limited to those described herein, and those skilled in the art will clearly understand from the following description of this disclosure other technical effects not mentioned.

[0134] While this disclosure has been described with reference to some exemplary embodiments shown in the accompanying drawings, these embodiments are merely illustrative, and it should be understood that those skilled in the art can derive various modifications and equivalent other embodiments based on these embodiments.

Claims

1. A mandrel for winding electrodes of a secondary battery, comprising: A first mandrel component includes a plurality of first longitudinal side portions, each of the plurality of first longitudinal side portions including a first longitudinal side surface and a first surface, wherein a first hollow portion is provided between the plurality of first longitudinal side portions; and A second mandrel member spaced apart from the first mandrel member, the second mandrel including a plurality of second longitudinal side portions, the plurality of second longitudinal side portions including a second longitudinal side surface and a second surface facing the first surface, wherein a second hollow portion is provided between the plurality of second longitudinal side portions.

2. The mandrel according to claim 1, wherein, The plurality of first longitudinal side portions of the first mandrel member include: The first flat portion has a first flat surface intersecting the first surface and includes a first through-hole portion; and The second flat portion has a second flat surface intersecting the first surface, is spaced apart from and faces the first flat portion, and includes a second through-hole portion.

3. The mandrel according to claim 2, wherein, The first mandrel member further includes a first tip portion that protrudes from the first flat portion and is received in the first hollow portion.

4. The mandrel according to claim 3, wherein, The first pointed portion does not contact the second flat portion and has a width that decreases toward the second flat portion.

5. The mandrel according to claim 3, wherein, The first mandrel member further includes a second tip portion that protrudes from the second flat portion and is received in the first hollow portion.

6. The mandrel according to claim 5, wherein, The second pointed portion does not contact the first flat portion and has a width that decreases toward the first flat portion.

7. The mandrel according to claim 5, wherein, The first tip portion includes a plurality of first tip portions, the second tip portion includes a plurality of second tip portions, and the plurality of first tip portions and the plurality of second tip portions are configured to be spaced apart from each other along the longitudinal direction of the first mandrel member.

8. The mandrel according to claim 7, wherein, The plurality of first tip portions and second tip portions are arranged in an alternating manner.

9. The mandrel according to claim 2, wherein, The plurality of first longitudinal side portions of the first mandrel member further include: The first inclined portion has a first inclined surface extending inclinedly from the first flat surface; and The second inclined portion has a second inclined surface that extends from the second flat surface in an inclined manner and is connected to the first inclined surface.

10. The mandrel according to claim 9, wherein: The interior angle between the first flat surface and the first inclined surface forms an obtuse angle; and The interior angle between the second flat surface and the second inclined surface forms an obtuse angle.

11. The mandrel according to any one of claims 1 to 10, wherein, The plurality of second longitudinal side portions of the second mandrel member include: The third flat portion has a third flat surface intersecting the second surface and includes a third through-hole portion; and The fourth flat portion has a fourth flat surface that intersects with the second surface, is spaced apart from and faces the third flat portion, and includes a fourth through-hole portion.

12. The mandrel according to claim 11, wherein, The second mandrel member further includes a third tip portion that protrudes from the third flat portion and is received in the second hollow portion.

13. The mandrel according to claim 12, wherein, The third pointed portion does not contact the fourth flat portion and has a width that decreases toward the fourth flat portion.

14. The mandrel according to claim 12, wherein, The second mandrel member further includes a fourth tip portion that protrudes from the fourth flat portion and is received in the second hollow portion.

15. The mandrel according to claim 14, wherein, The fourth tip portion does not contact the third flat portion and has a width that decreases toward the third flat portion.

16. The mandrel according to claim 14, wherein, The third tip portion includes a plurality of third tip portions, the fourth tip portion includes a plurality of fourth tip portions, and the plurality of third tip portions and the plurality of fourth tip portions are configured to be spaced apart from each other along the longitudinal direction of the second mandrel member.

17. The mandrel according to claim 16, wherein, The plurality of third and fourth tip portions are arranged in an alternating manner.

18. The mandrel according to claim 11, wherein, The plurality of second longitudinal side portions of the second mandrel member further include: The third inclined portion has a third inclined surface extending from the third flat surface in an inclined manner; and The fourth inclined portion has a fourth inclined surface that extends from the fourth flat surface and connects to the third inclined surface in an inclined manner.

19. The mandrel according to claim 18, wherein: The interior angle between the third flat surface and the third inclined surface forms an obtuse angle; and The interior angle between the fourth flat surface and the fourth inclined surface forms an obtuse angle.

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