Cap assembly, secondary battery including the cap assembly, and method for manufacturing the cap assembly

Abstract

The present disclosure provides a cover assembly, a secondary battery including the same, and a method for manufacturing the same. The cover assembly includes a cover plate having a through-hole and including a coating layer disposed on at least a portion of an upper surface of the cover plate, a terminal plate including a main body portion and an insertion portion protruding from the main body portion and inserted into the through-hole, an insulator interposed between the cover plate and the terminal plate, and a filler disposed in at least a portion of a space in which the insertion portion inserted into the through-hole is surrounded by the insulator and the cover plate.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a cover assembly, a secondary battery including the cover assembly, and a method for manufacturing the cover assembly. Background Technology

[0002] Unlike primary batteries, which are not designed for (re)charging, secondary (or rechargeable) batteries are designed to be discharged and recharged. Low-capacity secondary batteries are used in portable small electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for driving motors in hybrid and electric vehicles and for storing electricity (e.g., household and / or utility-scale power storage). A secondary battery typically includes an electrode assembly containing positive and negative electrodes, a housing that houses the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] A secondary battery can be manufactured by inserting an electrode assembly into a housing and then injecting an electrolyte into the housing. Some types of secondary batteries can be manufactured by sealing the housing containing the electrode assembly and electrolyte with a cover assembly. After charging and discharging the secondary battery, the portion of the electrolyte not introduced into the electrode side may be isolated within the cover assembly. Due to the isolated electrolyte, metal may precipitate from the coating on the components of the cover assembly. This precipitated metal can cause a short circuit in the secondary battery, thus potentially reducing its voltage.

[0004] The information disclosed in this background section is intended to enhance the understanding of the background technology of this disclosure, and therefore may contain information that does not constitute related (or prior art). Summary of the Invention

[0005] This disclosure has been made to address the above-mentioned technical problems, and aspects of embodiments of this disclosure include providing a cover assembly, a secondary battery including the cover assembly, and a method for manufacturing the cover assembly.

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

[0007] To address the technical problem, a cover assembly according to one or more embodiments of the present invention includes: a cover plate having a through hole and including a coating disposed on at least a portion of the upper surface of the cover plate; a terminal plate including a body portion and an insertion portion protruding from the body portion and inserted into the through hole; an insulator disposed between the cover plate and the terminal plate; and a filler disposed in at least a portion of the space in which the insertion portion inserted into the through hole is surrounded by the insulator and the cover plate.

[0008] According to one or more embodiments, the coating may include nickel (Ni).

[0009] According to one or more embodiments, the filler may contact at least a portion of the inner surface of the insulator and at least a portion of the upper surface of the cover plate, and may surround at least a portion of the side surface of the insertion portion.

[0010] According to one or more embodiments, the lower surface of the filler may be positioned corresponding to the upper surface of the cover plate.

[0011] According to one or more embodiments, the filler may be further configured to contact at least a portion of the inner surface of the cover plate.

[0012] According to one or more embodiments, the lower surface of the filler may be positioned to correspond to the lower surface of the cover plate.

[0013] According to one or more embodiments, the filler may include at least one of epoxy resin, polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS).

[0014] According to one or more embodiments, the cover assembly may further include an insulating gasket disposed on the underside of the cover plate, wherein the inner end of the insulating gasket may be positioned corresponding to the inner end of the cover plate.

[0015] According to one or more embodiments, the cover assembly may further include an insulating gasket disposed on the underside of the cover plate, wherein the inner end of the insulating gasket may be located inside the inner end of the cover plate.

[0016] To address the technical problem, a secondary battery according to one or more embodiments of the present invention includes: an electrode assembly; a housing including a bottom, a sidewall portion connected to the bottom, and an opening facing the bottom, wherein the electrode assembly is housed in the housing; and a cover assembly connected to one end of the sidewall portion of the housing to seal the opening, wherein the cover assembly includes: a cover plate having a through hole and including a coating disposed on at least a portion of the upper surface of the cover plate; a terminal plate including a body portion and an insertion portion protruding from the body portion and inserted into the through hole; an insulator disposed between the cover plate and the terminal plate; and a filler disposed in at least a portion of the space in which the insertion portion inserted into the through hole is surrounded by the insulator and the cover plate.

[0017] According to one or more embodiments, the filler may contact at least a portion of the inner surface of the insulator and at least a portion of the upper surface of the cover plate, and may surround at least a portion of the side surface of the insertion portion.

[0018] According to one or more embodiments, the lower surface of the filler may be positioned corresponding to the upper surface of the cover plate.

[0019] According to one or more embodiments, the filler may be further configured to contact at least a portion of the inner surface of the cover plate.

[0020] According to one or more embodiments, the lower surface of the filler may be positioned to correspond to the lower surface of the cover plate.

[0021] According to one or more embodiments, the cover assembly may further include an insulating gasket disposed on the underside of the cover plate, wherein the inner end of the insulating gasket may be positioned corresponding to the inner end of the cover plate.

[0022] According to one or more embodiments, the cover assembly may further include an insulating gasket disposed on the underside of the cover plate, wherein the inner end of the insulating gasket may be located inside the inner end of the cover plate.

[0023] According to one or more embodiments, the secondary battery may include a coin-type secondary battery or a button-type secondary battery.

[0024] According to one or more embodiments, the material used for the housing may include stainless steel (SUS).

[0025] To address the technical problem, a method for manufacturing a cover assembly according to one or more embodiments of the present invention includes: placing an insulator between a cover plate having a through hole and a terminal plate including an insertion portion protruding into the through hole; connecting the cover plate and the terminal plate by pressing the cover plate and the terminal plate while the insulator is placed between the cover plate and the terminal plate; and disposing a filler in at least a portion of the space in which the insertion portion inserted into the through hole is surrounded by the insulator and the cover plate.

[0026] According to one or more embodiments, setting the filler may include forming the filler by applying filler material to at least a portion of the space and hardening the filler material.

[0027] According to some embodiments of this disclosure, a cover assembly with improved safety, a secondary battery including the cover assembly, and a method for manufacturing the cover assembly can be provided.

[0028] According to some embodiments of this disclosure, a cover assembly capable of preventing electrolyte isolation in a portion of its space, a secondary battery including the cover assembly, and a method for manufacturing the cover assembly can be provided.

[0029] According to some embodiments of this disclosure, metal deposition can be prevented in advance by blocking contact between the electrolyte and the nickel-based coating through a filler, thereby reducing the risk of short circuits in secondary batteries.

[0030] However, the aspects and features of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the detailed description below that other aspects and features not mentioned are also included. Attached Figure Description

[0031] The accompanying drawings illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure, further describe aspects and features of the present disclosure. Therefore, the present disclosure should not be construed as limited to the drawings.

[0032] Figure 1 This is a perspective view illustrating an example of a secondary battery according to some embodiments of the present disclosure.

[0033] Figure 2 This is a cross-sectional view illustrating an example of a secondary battery according to some embodiments of the present disclosure.

[0034] Figure 3 This is an exploded perspective view illustrating an example of a cover assembly before the filling material is applied, according to some embodiments of the present disclosure.

[0035] Figure 4 This is a perspective view illustrating an example of a cover assembly before the filling material is applied, according to some embodiments of the present disclosure.

[0036] Figure 5 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a first embodiment of the present disclosure.

[0037] Figure 6 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a second embodiment of the present disclosure.

[0038] Figure 7 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a third embodiment of the present disclosure.

[0039] Figure 8 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a fourth embodiment of the present disclosure.

[0040] Figure 9 This is a diagram illustrating an example of a method for manufacturing a cover assembly according to some embodiments of the present disclosure.

[0041] Figure 10 This is a diagram illustrating examples of preventing metal from leaching into a cover assembly according to some embodiments of the present disclosure.

[0042] Figure 11 This is a flowchart illustrating an example of a method for manufacturing a cover assembly according to some embodiments of the present disclosure.

[0043] Description of some figure labels

[0044] 200: Secondary battery; 220: Housing

[0045] 210: Cover assembly; 230: Electrode assembly

[0046] 212: Cover plate; 232: First electrode

[0047] 213, 313, 513, 913, 923, 933, 943, 1013, 1023: Coating

[0048] 234: Second electrode

[0049] 214, 314, 414, 514, 914, 924, 934, 944, 1014, 1024: Insulators

[0050] 235: Diaphragm

[0051] 216: Terminal block; 236: First electrode connector

[0052] 218, 518, 618, 718, 818, 948, 1018, 1028: Insulating pads

[0053] 238: Second electrode connector

[0054] 216a, 316a, 416a, 516a, 916a, 926a, 936a, 946a: Main body

[0055] 216b, 316b, 416b, 516b, 916b, 926b, 936b, 946b: Insertion part

[0056] 219, 519, 719, 939, 949, 1029: Filler Detailed Implementation

[0057] In the following, embodiments of the present disclosure will be described in 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 conventional or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present disclosure, based on the principle that the inventor can appropriately define the concepts of the terms for his / her own lexicographer in order to best illustrate his / her invention.

[0058] The embodiments described in this specification and the configurations shown in the figures are merely some embodiments of this disclosure and do not represent all the technical spirit, aspects, and features of this disclosure. Accordingly, it should be understood that various equivalents and modifications that can replace or modify the embodiments described herein may exist at the time of filing this application.

[0059] It will be understood 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, connected to, or linked to the other element or layer, or one or more intermediary elements or layers may be present. 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, no intermediary element or layer is present. For example, when a first element is described as being "linked" or "connected" to a second element, the first element can be directly linked to or connected to the second element, or the first element can be indirectly linked to or connected to the second element via one or more intermediary elements.

[0060] In the figures, for clarity of illustration, the dimensions of various elements, layers, etc., may be enlarged. The same reference numerals indicate the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, when describing embodiments of this disclosure, the use of "may" refers to "one or more embodiments of this disclosure." Expressions such as "at least one of" and "any one of" modify the entire column of elements, not individual elements of the column, when following a column of elements. When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group of A, B, and C," or "at least one selected from A, B, and C" are used to specify a column of elements A, B, and C, the phrase may refer to any and all suitable combinations or 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" 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 as terms of degree, and are intended to take into account the inherent variations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art.

[0061] It will be understood that while the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, areas, layers, and / or segments, these elements, components, areas, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, area, layer, or segment from another. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, area, layer, or segment discussed below may be referred to as the second element, component, area, layer, or segment.

[0062] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. It will be understood that spatial relative terms are intended to encompass different orientations of the device in use or operation, other than those depicted in the figures. For example, if the device in the figures is flipped, an element described as “below” or “under” other elements or features would then be oriented as “above” or “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein should be interpreted accordingly.

[0063] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure. As used herein, unless the context clearly indicates otherwise, the singular form “a” is also intended to include the plural form. It will be further understood that the terms “comprising” and / or “including” as used in this specification specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0064] Furthermore, any numerical ranges disclosed and / or enumerated herein are intended to include all subranges with the same numerical precision contained 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., a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit enumerated herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit enumerated herein is intended to include all higher numerical limits contained therein. Accordingly, the applicant reserves the right to amend this specification, including the claims, to expressly enumerate any subranges contained within the scope expressly enumerated herein.

[0065] Referring to two compared elements, features, etc., as “identical” can mean that they are “substantially the same.” Therefore, the phrase “substantially the same” can include cases with a deviation considered low in the art, such as 5% or less. Furthermore, when a parameter is said to be consistent in a given region, this can mean that it is consistent in terms of its mean.

[0066] Throughout this specification, unless otherwise stated, each element may be a single element or a plurality of elements.

[0067] Placing any element "above (or below)" or "on (below)" another element means that the element can be positioned to contact the upper (or lower) surface of the element, and the other element can be positioned between the element and any element positioned on (or below) the element.

[0068] Additionally, it will be understood that when a component is referred to as a “link,” “connect,” or “attached” to another component, these components may be directly “connected,” “linked,” or “attached” to each other, or another component may be “placed” between these components.

[0069] Throughout this specification, unless otherwise stated, the phrase "A and / or B" means A, B, or A and B. That is, "and / or" includes any or all combinations of the listed items. Unless otherwise stated, the phrase "C to D" means C and above and D and below.

[0070] In this disclosure, for clarity of explanation, the dimensions and relative dimensions of the layers and regions shown in the figures may be enlarged. That is, the dimensions shown in the figures are for ease of understanding only and are not limiting. Furthermore, the same reference numerals denote the same elements throughout the specification.

[0071] Figure 1 This is a perspective view illustrating an example of a secondary battery according to some embodiments of the present disclosure.

[0072] refer to Figure 1 The secondary battery 100 may include a cover assembly 110 and a housing 120.

[0073] The secondary battery 100 can be a coin-shaped or button-shaped secondary battery. For example, the secondary battery 100 can have a cylindrical shape. However, the secondary battery 100 is not limited to this, and the secondary battery can be a prismatic secondary battery, a pouch-shaped secondary battery, a cylindrical secondary battery, etc. In some embodiments, the secondary battery 100 can be a rechargeable and rechargeable secondary battery.

[0074] The housing 120 can accommodate the electrode assembly (see...) Figure 2 (230). The electrode assembly 230 can be inserted into the housing 120 through an opening formed in one side of the housing 120. The opening of the housing 120 can then be sealed with a cover assembly 110. The opening of the housing 120 can be sealed by welding with the cover assembly 110. The cover assembly 110 can be engaged with one end of the side wall portion of the housing 120 to seal the opening.

[0075] Figure 2 This is a cross-sectional view illustrating an example of a secondary battery according to some embodiments of the present disclosure.

[0076] refer to Figure 2The secondary battery 200 may include a cover assembly 210, a housing 220, and an electrode assembly 230.

[0077] The cover assembly 210 may include a cover plate 212, a coating 213, an insulator 214, a terminal block 216, an insulating gasket 218, a filler 219, etc. The cover plate 212 may cover the opening of the housing 220. The cover plate 212 may engage with one side of the housing 220 corresponding to the opening side.

[0078] In some embodiments, the cover plate 212 may include a through hole formed therein and a coating 213 disposed on at least a portion of its upper surface. For example, the through hole may be formed at the center of the cover plate 212. A terminal plate 216 may be inserted into the through hole and engage with the cover plate 212.

[0079] In some embodiments, the terminal plate 216 may include a main body portion 216a disposed on the cover plate 212 and an insertion portion 216b protruding from the main body portion 216a. For example, the insertion portion 216b of the terminal plate 216 may be inserted into a through hole in the cover plate 212. The insertion portion 216b of the terminal plate 216 may contact the first electrode terminal piece 236 for connection thereto.

[0080] In some embodiments, an insulator 214 may be disposed between a cover plate 212 and a terminal plate 216. The insulator 214 may be adhesive to join the terminal plate 216 and the cover plate 212. The insulator 214 may include an adhesive material for joining the terminal plate 216 and the cover plate 212. For example, an adhesive layer may be disposed on both surfaces of the insulator 214 to join the terminal plate 216 and the cover plate 212. The insulator 214 may be formed of an insulating material to provide electrical insulation between the terminal plate 216 and the cover plate 212.

[0081] In some embodiments, the filler 219 may be disposed in at least a portion of the space surrounding the insulator 214 and the cover plate 212 in the insertion portion 216b of the terminal plate 216 that is inserted into the through hole of the cover plate 212. Reference will be made later. Figures 5-8 The arrangement of filler 219 is described in detail.

[0082] The housing 220 can accommodate the electrode assembly 230 and the electrolyte, and together with the cover assembly 210 forms the appearance of a secondary battery. The housing 220 may include a sidewall portion having a substantially cylindrical shape and a bottom portion attached to one side of the sidewall portion. However, the housing 220 is not limited to this, and the housing 220 can be configured in various shapes, such as a circular shape, a pouch shape, etc. The housing 220 can be made of metals such as stainless steel (SUS), aluminum (Al), aluminum alloys, and nickel-plated steel, a pouch-forming laminate, or plastic.

[0083] The electrode assembly 230 may include a first electrode 232, a second electrode 234, and a diaphragm 235, and may further include a first electrode connector 236 connected to the first electrode 232 and a second electrode connector 238 connected to the second electrode 234. The first electrode connector 236 may be connected to the cover assembly 210, and the second electrode connector 238 may be connected to the bottom of the housing 220.

[0084] The first electrode 232 may include a first substrate material, a first uncoated portion formed on the first substrate material, and a first electrode tab 236 connected to a surface of the first uncoated portion. The first electrode 232 may include a first active material layer coated with a first active material. The first electrode tab 236 may extend outward from the first uncoated portion of the first substrate material that is not coated with the first active material, and may be electrically connected to the terminal plate 216 of the cover assembly 210.

[0085] The second electrode 234 may include a second substrate material, a second uncoated portion formed on the second substrate material, and a second electrode tab 238 connected to a surface of the second uncoated portion. The second electrode 234 may include a second active material layer coated with a second active material. The second electrode tab 238 may extend outward from the second uncoated portion of the second substrate material that is not coated with the second active material, and may be electrically connected to the housing 230.

[0086] Each of the first electrode terminal piece 236 and the second electrode terminal piece 238 may be covered with a covering tape. The covering tape may include an insulating material. For example, the insulating material may provide electrical insulation and may prevent current from passing through. The covering tape can prevent short circuits in the first electrode terminal piece 236 and the second electrode terminal piece 238.

[0087] The first electrode 232 can be used as a positive electrode. For example, the first substrate material can be made of aluminum foil, and the first active material can include a transition metal oxide.

[0088] The positive electrode plate for a rechargeable lithium battery may include a current collector and a layer of positive electrode active material on the current collector. The positive electrode active material layer may include a positive electrode active material and may further include a binder and / or a conductive material (e.g., a conductive material).

[0089] For example, the positive electrode plate may further include additives that can be used as a sacrificial positive electrode.

[0090] Based on a 100 wt% positive electrode active material layer, the amount of positive electrode active material can be from about 90 wt% to about 99.5 wt%. Based on a 100 wt% positive electrode active material layer, the amounts of binder and conductive material can be from about 0.5 wt% to about 5 wt%, respectively.

[0091] The binder is used to ensure good adhesion between the positive electrode active material particles and also to ensure good adhesion of the positive electrode active material to the current collector. As a non-limiting example, examples of binders may include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polymers containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, nylon, etc.

[0092] Conductive materials can be used to impart conductivity (e.g., electrical conductivity) to electrodes. Any material that does not cause chemical changes (e.g., does not cause undesirable chemical changes in rechargeable lithium batteries) and conducts electrons can be used in the battery. Examples of conductive materials can include: carbon-based materials such as natural graphite, synthetic graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes; metal-based materials comprising copper, nickel, aluminum, silver, etc., in the form of metal powders or metal fibers; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0093] Al can be used as a current collector, but is not limited to this.

[0094] The positive electrode active material may include compounds capable of intercalating and deintercalating lithium (e.g., lithiation intercalation compounds). Specifically, at least one of lithium and a composite oxide selected from cobalt, manganese, nickel, and combinations thereof may be used.

[0095] The composite oxide can be a lithium transition metal composite oxide. Specific examples of composite oxides may include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0096] As an example, the following compounds, represented by any of the following chemical formulas, can be used. Li a A 1-b X b O 2- c D c (0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); Li a Mn 2-b X b O 4-c D c (0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); Li a Ni 1-b-c Cob X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, and 0<α<2); Li a Ni 1-b-c Mn b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, and 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, and 0≤e≤0.1); Li a NiG b O2 (0.90≤a≤1.8 and 0.001≤b≤0.1); Li a CoG b O2 (0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn 1-b G b O2 (0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn2G b O4 (0.90≤a≤1.8 and 0.001≤b≤0.1); Li a Mn 1-g G g PO4 (0.90 ≤ a ≤ 1.8 and 0 ≤ g ≤ 0.5); Li (3-f) Fe2(PO4)3 (0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0097] In the above chemical formulas, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L 1 It is Mn, Al, or a combination thereof.

[0098] The positive electrode active material can be, for example, a high-nickel-based positive electrode active material, based on a lithium-free metal in 100 mol% of a lithium transition metal composite oxide, with a nickel content greater than or equal to about 80 mol%, greater than or equal to about 85 mol%, greater than or equal to about 90 mol%, greater than or equal to about 91 mol%, or greater than or equal to about 94 mol% and less than or equal to about 99 mol%. High-nickel-based positive electrode active materials can achieve high capacity and can be applied to high-capacity, high-density rechargeable lithium batteries. The second electrode 234 can be used as a negative electrode. For example, the second substrate material can be composed of copper foil or nickel foil, and the second active material can include graphite.

[0099] The negative electrode plate for a rechargeable lithium battery may include a current collector and a layer of negative electrode active material on the current collector. The negative electrode active material layer may include a negative electrode active material and may further include a binder and / or a conductive material (e.g., a conductive material).

[0100] For example, the negative electrode active material layer may include about 90 wt% to about 99 wt% of negative electrode active material, about 0.5 wt% to about 5 wt% of binder, and about 0 wt% to about 5 wt% of conductive material.

[0101] The negative electrode current collector may include copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with a conductive metal, or a combination thereof.

[0102] The negative electrode active material may include materials that can reversibly insert / deintercalate lithium ions, lithium metal, lithium metal alloys, materials that can be doped / dedoped with lithium, or transition metal oxides.

[0103] Materials capable of reversibly inserting / deintercalating lithium ions can include carbon-based negative electrode active materials, such as crystalline carbon, amorphous carbon, or combinations thereof. Crystalline carbon can be graphite, such as amorphous, flake-like, sheet-like, spherical, or fibrous natural or artificial graphite. Amorphous carbon can be soft carbon, hard carbon, mesophase pitch carbonization products, calcined coke, etc.

[0104] Lithium metal alloys include alloys of lithium and metals selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn.

[0105] Materials capable of doping / dedoping lithium can be either Si-based or Sn-based negative electrode active materials. Si-based negative electrode active materials can include silicon, silicon-carbon composites, and SiO₂. x(0 < x ≤ 2), Si-Q alloy (where Q is selected from alkali metals, alkaline earth metals, Group 13 elements, Group 14 elements (excluding Si), Group 15 elements, Group 16 elements, transition metals, rare earth elements, and combinations thereof). The Sn-based negative electrode active material may include Sn, SnO2, Sn-based alloy, or a combination thereof.

[0106] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles. For example, the silicon-carbon composite may include secondary particles (cores) in which primary silicon particles are concentrated and an amorphous carbon coating (shell) on the surface of the secondary particles. The amorphous carbon may also be between the primary silicon particles. For example, the primary silicon particles may be coated with amorphous carbon. The secondary particles may be dispersed in the amorphous carbon matrix.

[0107] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core and an amorphous carbon coating on the surface of the core, where the core includes crystalline carbon and silicon particles.

[0108] The Si-based negative electrode active material or the Sn-based negative electrode active material may be used in combination with a carbon-based negative electrode active material.

[0109] The separator 235 may allow lithium ions to move between the first electrode and the second electrode and, at the same time, be used to prevent a short circuit between the first electrode and the second electrode. For example, the separator may be made of a polyethylene film, a polypropylene film, a polyethylene-polypropylene film, etc., but the present disclosure is not limited thereto.

[0110] The separator 235 may include polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer film of two or more layers thereof, and hybrid multilayer films such as a polyethylene / polypropylene two-layer separator, a polyethylene / polypropylene / polyethylene three-layer separator, a polypropylene / polyethylene / polypropylene three-layer separator, etc.

[0111] The separator 235 may include a porous substrate and a coating including an organic material, an inorganic material, or a combination thereof on one or both surfaces of the porous substrate.

[0112] The porous substrate may be a polymer film formed of any one polymer selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate, etc.), polyacetals, polyamides, polyimides, polycarbonates, polyether ketones, polyarylether ketones, polyetherimides, polyamideimides, polybenzimidazoles, polyethersulfones, polyphenylene ethers, cycloolefin copolymers, polyphenylene sulfides, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon), or a copolymer or mixture of two or more of them.

[0113] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0114] Inorganic materials may include, but are not limited to, inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0115] Organic and inorganic materials can be mixed in a coating, or coatings containing organic materials and coatings containing inorganic materials can be stacked.

[0116] Figure 2 This is a schematic diagram illustrating an example of the winding structure of a wound electrode assembly 230, and the number, size, and structure of the electrode plates are not limited thereto. The outermost periphery of the electrode assembly 230 may be terminated by a first electrode 232 or a second electrode 234. The first electrode tab 236 and the second electrode tab 238 of the electrode assembly 230 may be formed on different sides of the electrode assembly 230.

[0117] Figure 3 This is an exploded perspective view illustrating an example of a cover assembly before the filling material is applied, according to some embodiments of the present disclosure. To describe in detail the connection relationships between the components included in the cover assembly, Figure 3 Example: half of the cover assembly before the filling and insulating liner are installed.

[0118] refer to Figure 3 Before the filler and insulating liner are provided, the cover assembly may include a cover plate 312, an insulator 314, and a terminal block 316.

[0119] In some embodiments, the cover plate 312 may include a through hole 311 and a coating 313 disposed on at least a portion of its upper surface. The cover plate 312 may include stainless steel (SUS), but this disclosure is not limited thereto. The through hole 311 may be formed in the center of the cover plate 312. An insertion portion 316b of the terminal plate 316 may be inserted into the through hole 311. The diameter of the through hole 311 may be larger than the diameter of the insertion portion 316b. Accordingly, at least a portion of the insertion portion 316b may be exposed through the through hole 311.

[0120] In some embodiments, coating 313 may be composed of a material used to improve the connection between cover plate 312 and insulator 314. When insulator 314, comprising a polymer material, and cover plate 312, comprising metal, are extruded, coating 313 may include metal to improve the connection. Regarding the above-described properties, coating 313 may include at least one of nickel (Ni), chromium (Cr), titanium (Ti), copper (Cu), palladium (Pd), and zinc (Zn). For example, coating 313 may be formed by plating at least a portion of the upper surface of cover plate 312 with nickel (Ni). Coating 313 may be positioned between cover plate 312 and insulator 314. Accordingly, the connection between cover plate 312 and insulator 314 can be improved, thus improving the connection between components of the cover assembly.

[0121] In some embodiments, the terminal plate 316 may include a main body 316a and an insertion portion 316b protruding from the main body 316a and inserted into a through hole 311. The center of the insertion portion 316b may coincide with the center of the terminal plate 316. The terminal plate 316 may include aluminum (Al), but this disclosure is not limited thereto.

[0122] In some embodiments, the insulator 314 may be placed between the cover plate 312 and the terminal plate 316. A hole may be formed in the center of the insulator 314, and the insertion portion 316b may pass through the hole in the insulator 314. The diameter of the hole in the insulator 314 may be larger than the diameter of the insertion portion 316b.

[0123] In some embodiments, the hole in the insulator 314 may face the through hole 311. The diameter of the hole in the insulator 314 may be larger than the diameter of the through hole 311. In other embodiments, the diameter of the hole in the insulator 314 may be the same as the diameter of the through hole 311.

[0124] In some embodiments, the insulator 314 may comprise a polymer material. The polymer material may have high chemical stability and high corrosion resistance, and may prevent electrical conductivity to provide electrical insulation between the cover plate 312 and the terminal plate 316. Regarding the above characteristics, the material used for the insulator 314 may comprise at least one of polypropylene (PP), polyamide (PA), polyimide (PI), ceramic-coated insulators, and polyethylene terephthalate (PET).

[0125] Figure 4 This is a perspective view illustrating an example of a cover assembly before the filling material is applied, according to some embodiments of the present disclosure. Figure 4 This is a perspective view illustrating an example of the cover assembly before the filling and insulating liner are installed, as viewed from below.

[0126] like Figure 4As shown, before the filler is applied, the cover assembly may have an insert 416b inserted into the through hole surrounded by an insulator 414 and a cover plate 412.

[0127] After charging and discharging the secondary battery, electrolyte not introduced to the electrode side may be isolated in the space surrounded by the insulator 414 and the cover plate 412 in the insertion portion 416b inserted into the through hole. Due to the isolated electrolyte, metal may be deposited from the coating plated on the upper surface of the cover plate 412. Therefore, a short circuit may occur in the secondary battery due to the deposited metal, and the voltage of the secondary battery may drop.

[0128] To prevent the electrolyte from being trapped in the aforementioned space, fillers and insulating gaskets can be provided. These fillers and insulating gaskets will be described in detail below.

[0129] Figure 5 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a first embodiment of the present disclosure. Figure 6 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a second embodiment of the present disclosure. Figure 7 This is a cross-sectional view illustrating an example of a cover assembly including filler and insulating pad according to a third embodiment of the present disclosure. Figure 8 This is a cross-sectional view illustrating an example of a cover assembly including a filler and an insulating gasket according to a fourth embodiment of the present disclosure. In addition to the filler and insulating gasket, the cover assemblies according to the first to fourth embodiments can be combined with… Figure 2 The cover component 210 is the same. For example, it can be based on the... Figure 2 and Figure 3 To understand the description Figures 5-8 The cover plate 512, coating 513, insulator 514, and terminal plate 516 are included. Figures 5-8 The description of the cover assembly will focus on the filler and insulating liner.

[0130] refer to Figure 5 The filler 519 may be disposed in at least a portion of the space of the insertion portion 516b inserted into the through hole, which is surrounded by the insulator 514 and the cover plate 512.

[0131] In some embodiments, the filler 519 may comprise a polymeric material that does not react with the electrolyte and has insulating properties. For example, the filler 519 may comprise at least one of epoxy resin, polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS). In this example, the filler 519 may be formed by applying epoxy resin to at least a portion of the space surrounding the insulator 514 and the cover plate 512 in the insertion portion 516b inserted into the through hole and then allowing it to harden. Accordingly, the filler 519 can be easily provided, thus reducing the manufacturing time and cost of the cover assembly 510.

[0132] In some embodiments, the filler 519 may contact at least a portion of the inner surface of the insulator 514 and at least a portion of the upper surface of the cover plate 512, and may surround at least a portion of the side surface of the insertion portion 516b. Accordingly, the isolation of the electrolyte in the inner surface of the insulator 514 and the upper surface of the cover plate 512 can be prevented in advance, thereby preventing metal deposition.

[0133] In some embodiments, the lower surface of the filler 519 may be configured to correspond to the upper surface of the cover plate 512. Here, the phrase "corresponds to" may mean that the height of the lower surface of the filler 519 is the same as the height of the upper surface of the cover plate 512, or substantially the same as the height of the upper surface of the cover plate 512 within a certain error range. In other embodiments, the height of the lower surface of the filler 519 may be positioned lower than the height of the upper surface of the cover plate 512.

[0134] In some embodiments, the cover assembly 510 may further include an insulating gasket 518 disposed on the underside of the cover plate 512, and the inner end of the insulating gasket 518 may be positioned corresponding to the inner end of the cover plate 512. Here, the phrase "corresponding to" may mean that the position of the inner end of the insulating gasket 518 is the same as the position of the inner end of the cover plate 512, or substantially the same as the position of the inner end of the cover plate 512 within a certain error range.

[0135] refer to Figure 6 The cover assembly 610 may further include an insulating gasket 618 disposed on the underside of the cover plate 512, and the inner end of the insulating gasket 618 may be located inside the inner end of the cover plate 512. Here, the phrase "inner side" may refer to the direction close to the insertion portion 516b. Accordingly, electrolyte can be prevented from being introduced into the space surrounded by the insulator 514 and the cover plate 512 in the insertion portion 516b inserted into the through hole.

[0136] refer to Figure 7The filler 719 can be further configured to contact at least a portion of the inner surface of the cover plate 512 and surround at least a portion of the side surface of the insertion portion 516b. Accordingly, electrolyte can be prevented from being introduced into the space of the insertion portion 516b inserted into the through hole, which is surrounded by the insulator 514 and the cover plate 512.

[0137] In some embodiments, the lower surface of the filler 719 may be configured to correspond to the lower surface of the cover plate 512. Here, the phrase "corresponds to" may mean that the height of the lower surface of the filler 719 is the same as the height of the lower surface of the cover plate 512, or is substantially the same as the height of the lower surface of the cover plate 512 within a certain error range.

[0138] In some embodiments, the cover assembly 710 may further include an insulating pad 718 disposed on the underside of the cover plate 512, and the inner end of the insulating pad 718 may be located inside the inner end of the cover plate 512.

[0139] refer to Figure 8 The cover assembly 810 may further include an insulating gasket 818 disposed on the underside of the cover plate 512, and the inner end of the insulating gasket 818 may be positioned corresponding to the inner end of the cover plate 512.

[0140] Figure 9 This is a diagram illustrating an example of a method for manufacturing a cover assembly according to some embodiments of the present disclosure. Details will be omitted. Figure 9 The cover assembly shown is in Figures 2-8 The description of the structure of the cover component is repeated.

[0141] refer to Figure 9 The first example 910 may be a cross-sectional view illustrating an example of an insulator 914 positioned between a cover plate 912 and a terminal plate. In some embodiments, a through-hole may be formed in the cover plate 912, and the terminal plate may include an insertion portion 916b protruding into the through-hole. A hole may be formed in the center of the insulator 914, and the insertion portion 916b may pass through the hole in the insulator 914.

[0142] The second example 920 may be a cross-sectional view illustrating an example of a cover plate 922 and a terminal plate being extruded with an insulator 924 placed between them. Extrusion equipment may be used for the extrusion process. The thickness of the insulator 924 can be reduced by the extrusion process. In some embodiments, a coating 923 may be formed by plating nickel (Ni) onto at least a portion of the upper surface of the cover plate 922. The coating 923 may be positioned between the cover plate 922 and the insulator 924. Accordingly, the connection between the cover plate 922 and the insulator 924 can be improved, and thus the connection between the components of the cover assembly can be improved.

[0143] The third example 930 may be a cross-sectional view illustrating an example of filler 939 disposed in at least a portion of the space surrounding the insulator 934 and the cover plate 932 in the insertion portion 936b inserted into the through hole. In some embodiments, filler 939 may contact at least a portion of the inner surface of the insulator 934, at least a portion of the upper surface of the cover plate 932, and at least a portion of the inner surface of the cover plate 932, and may surround at least a portion of the side surface of the insertion portion 936b. In some embodiments, filler 939 may be formed by applying epoxy resin to at least a portion of the space surrounding the insulator 934 and the cover plate 932 in the insertion portion 936b inserted into the through hole and then allowing it to harden.

[0144] Fourth Example 940 is a cross-sectional view illustrating an example in which an insulating gasket 948 is disposed on the underside of a cover plate 942. In some embodiments, the inner end of the insulating gasket 948 may be disposed inside the inner end of the cover plate 942.

[0145] As described above, the cap assembly with filler according to this disclosure can be manufactured by adding an epoxy resin to a prior manufacturing process of the cap assembly and then allowing it to harden. Accordingly, the manufacturing process can be simplified, and thus the manufacturing time and cost of the cap assembly can be reduced.

[0146] Figure 10 This is a diagram illustrating examples of preventing metal from leaching into a cover assembly according to some embodiments of the present disclosure.

[0147] refer to Figure 10 The first example 1010 illustrates a configuration of a cover assembly for a secondary battery. This cover assembly is unfilled and engages with the housing such that the insertion portion of the terminal plate 1016 faces the electrode assembly. The cover assembly may include a terminal plate 1016 connected to the positive electrode and a cover plate 1012 connected to the negative electrode. The cover assembly may include a coating 1013 disposed on at least a portion of the upper surface of the cover plate 1012. The coating 1013 may be a metal layer formed by nickel (Ni) plating. The cover assembly may include an insulator 1014 disposed between the terminal plate 1016 and the cover plate 1012. The insulator 1014 prevents short circuits between the terminal plate 1016 and the cover plate 1012.

[0148] In the first example 1010, the electrolyte may be isolated in the space surrounding the insertion portion of the terminal plate 1016 by the insulator 1014 and the cover plate 1012. For example, when the cover plate 1012 is used as the negative electrode, the coating 1013 may not be able to form a negative potential due to the electrolyte not being introduced into the positive electrode side and being isolated, thus metal 1000 may be deposited. Metal 1000 may include nickel (Ni). Accordingly, due to the deposited metal 1000, a short circuit may occur between the cover plate 1012 and the terminal plate 1016, and the voltage of the secondary battery may drop rapidly.

[0149] Example 1020: An illustration and reference Figure 7 The described cover assembly is an example of a cover assembly with the same configuration. Terminal plate 1026 can be coupled to the positive electrode, and cover plate 1022 can be coupled to the negative electrode. Filler 1029 can be disposed in the space of the insertion portion of terminal plate 1026 surrounded by insulator 1024 and cover plate 1022. The cover assembly may include an insulating pad 1028 disposed on the underside of cover plate 1022, and the inner end of insulating pad 1028 may be located inside the inner end of cover plate 1022.

[0150] The second example 1020 can prevent electrolyte from being introduced into the space surrounded by the insulator 1024 and the cover plate 1022 in the insertion portion of the terminal plate 1026. For example, contact between the electrolyte and the nickel (Ni) coating 1023 can be prevented in advance by the filler 1029. Accordingly, metal deposition can be prevented, thereby preventing a short circuit between the terminal plate 1026 and the cover plate 1022. The secondary battery according to this disclosure can be relatively safe due to the reduced risk of short circuit.

[0151] Figure 11 This is a flowchart illustrating an example of a method for manufacturing a cover assembly according to some embodiments of the present disclosure.

[0152] refer to Figure 11A method 1100 for manufacturing a cover assembly may begin by placing an insulator between a cover plate having a through-hole and a terminal plate including an insertion portion protruding into the through-hole (S1110). For example, the cover plate may include the through-hole and include a coating disposed on at least a portion of its upper surface. The cover plate may include stainless steel (SUS), but this disclosure is not limited thereto. The through-hole may be formed at the center of the cover plate. The insertion portion of the terminal plate may be inserted into the through-hole. The diameter of the through-hole may be larger than the diameter of the insertion portion. Accordingly, at least a portion of the insertion portion may be exposed through the through-hole. In some embodiments, the coating may be made of a material used to enhance the connection between the cover plate and the insulator. When an insulator comprising a polymer material and a cover plate comprising metal are extruded, the coating may comprise metal to enhance the connection. Regarding the above characteristics, the coating may include at least one of nickel (Ni), chromium (Cr), titanium (Ti), copper (Cu), palladium (Pd), and zinc (Zn). For example, the coating may be formed by plating nickel (Ni) onto at least a portion of the upper surface of the cover plate. The coating may be disposed between the cover plate and the insulator. Accordingly, the connection between the cover plate and the insulator can be improved, thus improving the connection between the components of the cover assembly. In some embodiments, the terminal plate may include a body portion and an insertion portion protruding from the body portion and inserted into a through hole. The center of the insertion portion may coincide with the center of the terminal plate. The terminal plate may include aluminum (Al), but this disclosure is not limited thereto. In some embodiments, a hole may be formed in the center of the insulator, and the insertion portion may pass through the hole in the insulator. The diameter of the hole in the insulator may be larger than the diameter of the insertion portion. In some embodiments, the hole in the insulator may face the through hole. The diameter of the hole in the insulator may be larger than the diameter of the through hole. In other embodiments, the diameter of the hole in the insulator may be the same as the diameter of the through hole. In some embodiments, the insulator may include a polymer material. The polymer material may have high chemical stability and high corrosion resistance, and may prevent electrical conductivity to provide electrical insulation between the cover plate and the terminal plate. Regarding the above properties, the material used for the insulator may include at least one of polypropylene (PP), polyamide (PA), polyimide (PI), ceramic-coated insulators, and polyethylene terephthalate (PET).

[0153] Next, the cover plate and terminal plate can be pressed together with the insulator placed between them (S1120).

[0154] Next, a filler can be disposed in at least a portion of the space surrounding the insert portion inserted into the through-hole and the insulator and cover plate (S1130). The filler may comprise a series of polymer materials that do not react with the electrolyte and have insulating properties. For example, the filler may comprise at least one of epoxy resin, polypropylene (PP), polyethylene terephthalate (PET), and polystyrene (PS). For example, the filler can be formed by applying epoxy resin to at least a portion of the space surrounding the insert portion inserted into the through-hole and the insulator and cover plate and then allowing it to harden. Accordingly, the filler can be easily disposed of, thus reducing the manufacturing time and cost of the cover assembly.

[0155] In some embodiments, setting the filler (S1130) may include forming the filler by applying filler material to at least a portion of the space surrounded by the insulator and cover plate of the insertion portion inserted into the through hole and then hardening it.

[0156] Finally, an insulating gasket (S1140) can be provided on the underside of the cover plate. For example, the inner end of the insulating gasket can be located inside the inner end of the cover plate. The phrase "inner side" can refer to the direction close to the insertion part. Accordingly, electrolyte can be prevented from being introduced into the space surrounded by the insulator and the cover plate of the insertion part inserted into the through hole.

[0157] Figure 11 The flowcharts and their detailed descriptions may be merely examples of this disclosure, and the scope of this disclosure is not limited to... Figure 11 The flowchart and its detailed description. For example, one or more processes can be added / changed / deleted from the flowchart and its detailed description, the order of one or more processes can be changed, and multiple processes can be executed simultaneously.

[0158] While this disclosure has been described above with respect to embodiments thereof, it is not limited thereto. Various modifications and variations may be made by those skilled in the art within the spirit of this disclosure and the equivalents of the appended claims.

Claims

1. A cover assembly, comprising: A cover plate having a through hole, and the cover plate including a coating disposed on at least a portion of the upper surface of the cover plate; A terminal block includes a main body and an insertion part, the insertion part protruding from the main body and inserted into the through hole; An insulator is placed between the cover plate and the terminal plate; as well as A filler is disposed in at least a portion of the space in which the insertion portion, inserted into the through hole, is surrounded by the insulator and the cover plate.

2. The cover assembly of claim 1, wherein the coating comprises nickel.

3. The cover assembly of claim 1, wherein the filler contacts at least a portion of the inner surface of the insulator and at least a portion of the upper surface of the cover plate, and the filler surrounds at least a portion of the side surface of the insertion portion.

4. The cover assembly of claim 3, wherein the lower surface of the filler is positioned corresponding to the upper surface of the cover plate.

5. The cover assembly of claim 3, wherein the filler is further configured to contact at least a portion of the inner surface of the cover plate.

6. The cover assembly of claim 5, wherein the lower surface of the filler is positioned corresponding to the lower surface of the cover plate.

7. The cover assembly of claim 1, wherein the filler comprises at least one selected from epoxy resin, polypropylene, polyethylene terephthalate, and polystyrene.

8. The cover assembly according to any one of claims 1 to 7, further comprising an insulating gasket disposed on the underside of the cover plate. The inner end of the insulating gasket is positioned corresponding to the inner end of the cover plate.

9. The cover assembly according to any one of claims 1 to 7, further comprising an insulating gasket disposed on the underside of the cover plate. The inner end of the insulating liner is located inside the inner end of the cover plate.

10. A secondary battery, comprising: Electrode assembly; The housing includes a bottom, a sidewall portion connected to the bottom, and an opening facing the bottom, the housing accommodating the electrode assembly; as well as A cover assembly, connected to one end of the side wall portion of the housing to seal the opening. The cover assembly thereon is the cover assembly according to any one of claims 1 to 9.

11. The secondary battery according to claim 10, wherein the secondary battery comprises a coin-type secondary battery or a button-type secondary battery.

12. The secondary battery of claim 10, wherein the material used for the casing comprises stainless steel.

13. A method for manufacturing a cover assembly, the method comprising: The insulator is placed between a cover plate with a through hole and a terminal plate including an insertion portion protruding into the through hole; The cover plate and the terminal plate are connected by pressing the cover plate and the terminal plate together while the insulator is placed between the cover plate and the terminal plate; as well as The filler is disposed in at least a portion of the space surrounding the insert portion inserted into the through hole, which is surrounded by the insulator and the cover plate.

14. The method of claim 13, wherein the setting the filler comprises: The filler is formed by applying filler material to at least a portion of the space and hardening the filler material.

Images