Battery cell and cover assembly disposed in the battery cell

Abstract

The present disclosure provides an electrode assembly and a cover assembly provided in an electrode assembly, the electrode assembly including: an electrode assembly; an electrode assembly case accommodating the electrode assembly; a cover plate covering an end portion of an opening of the electrode assembly case and including at least one through hole; and a terminal assembly combined with the cover plate, the terminal assembly including: a terminal electrically connected with the electrode assembly; a bracket provided around the terminal in a lateral direction of the terminal assembly; and an insulating member provided between the terminal and the bracket, the cover plate including a stepped portion formed on a face of the cover plate facing the electrode assembly and formed around the through hole, at least a portion of the bracket being provided in the stepped portion and combined with an inner face of the cover plate, the inner face of the cover plate being the face of the cover plate facing the electrode assembly.

Description

Technical Field

[0001] This disclosure relates to a rechargeable and dischargeable battery cell (secondary battery) and a cover assembly disposed in the battery cell. Background Technology

[0002] Unlike primary batteries, secondary batteries offer the convenience of being able to be charged and discharged, making them a popular choice as a power source for various mobile devices, electric vehicles, energy storage devices, and more.

[0003] Secondary battery cells can be manufactured as pouch-type or can-type cells. Pouch-type cells have a structure in which electrode assemblies are housed inside a flexible cell casing (pouch). Can-type cells have a structure in which electrode assemblies are housed inside a rigid cell casing (can), and can be constructed as cylindrical cells, prismatic cells, button cells, etc. Utility Model Content

[0004] (a) Technical problems to be solved The battery cell may include an electrode assembly, a cell housing housing the electrode assembly, a current collector electrically connected to the electrode assembly, and a cover assembly covering the end of an opening in the cell housing. The cover assembly may include a cover plate having a through hole, a rivet terminal riveted to the through hole of the cover plate, an external terminal coupled to the rivet terminal and electrically connected to the current collector, an insulating component insulating the rivet terminal from the cover plate, and a seal gasket sealing the rivet terminal from the cover plate.

[0005] Traditional cover assemblies use rivet terminals to connect the external terminals of the cover assembly to the current collector, and use insulating components and sealing gaskets to perform the sealing and insulation functions of the cover assembly. Traditional cover assemblies are complex in structure and expensive to manufacture due to the inclusion of multiple components.

[0006] According to one aspect of this disclosure, a battery cell and a cover assembly disposed in the battery cell can be provided that can simplify the number of components and / or structure of the cover assembly.

[0007] According to one aspect of this disclosure, a battery cell capable of preventing terminal assemblies from detaching from a cover plate and a cover assembly disposed in the battery cell can be provided.

[0008] According to one aspect of this disclosure, a battery cell capable of improving the sealing performance of a cover assembly in a portion in which terminal assemblies are mounted, and a cover assembly disposed in the battery cell, may be provided.

[0009] According to one aspect of this disclosure, a battery cell with an easy-to-manufacture cover assembly and a cover assembly disposed in the battery cell can be provided.

[0010] According to one aspect of this disclosure, a battery cell capable of reducing the manufacturing cost of a cover assembly and a cover assembly disposed in the battery cell can be provided.

[0011] The battery cell and cover assembly disposed within the battery cell disclosed herein can be widely used in electric vehicles, battery charging stations, and other green technology fields such as solar power generation and wind power generation that utilize batteries. Furthermore, the battery cell and cover assembly disposed within the battery cell disclosed herein can be used in eco-friendly electric vehicles, hybrid vehicles, and other applications that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0012] (II) Technical Solution The battery cell according to this disclosure may include: an electrode assembly; a battery cell housing for receiving the electrode assembly; a cover plate covering an end of an opening in the battery cell housing and including at least one through hole; and a terminal assembly coupled to the cover plate, the terminal assembly including: a terminal electrically connected to the electrode assembly; a support disposed laterally around the terminal; and an insulating member disposed between the terminal and the support, the cover plate including a stepped portion formed on the surface of the cover plate facing the electrode assembly and around the through hole, at least a portion of the support plate being disposed on the stepped portion and coupled to an inner surface of the cover plate, the inner surface of the cover plate being the surface of the cover plate facing the electrode assembly.

[0013] According to one embodiment, the terminal assembly can be inserted into the through hole in a direction from the inside to the outside of the cell housing, and the bracket can be welded to the inner side of the cover plate while it is positioned on the stepped portion.

[0014] According to one embodiment, the support may include: a second portion extending along a first direction; a first portion extending along the lateral direction from a first side end of the second portion; and a third portion spaced apart from the first portion in the first direction and extending along the lateral direction from a second side end of the second portion, wherein the first portion may extend laterally inward from the second portion and the third portion may extend laterally outward from the second portion.

[0015] According to one embodiment, the third portion of the bracket may be disposed on the stepped portion and welded to the inner side of the cover plate.

[0016] According to one embodiment, the first portion and the third portion may have a shape that bends from both ends of the second portion.

[0017] According to one embodiment, the outer diameter of the third portion may be larger than the inner diameter of the through hole.

[0018] According to one embodiment, in the lateral direction, the length by which the third portion extends from the second portion may be greater than the length by which the first portion extends from the second portion.

[0019] According to one embodiment, the insulating component may include: an inner portion filling between the outer side of the terminal and the inner side of the bracket; an outer portion opposite to the inner portion and covering the outer side of the bracket across the bracket; and a connecting portion connecting the inner portion and the outer portion.

[0020] According to one embodiment, the support may include a perforated through-hole, and the insulating member may have a shape that fills the through-hole.

[0021] According to one embodiment, the terminal may include a protrusion projecting outwards to the side, and the insulating member may include a recess accommodating the protrusion.

[0022] According to one embodiment, the outer diameter of the protrusion may be greater than the minimum inner diameter of the bracket, and the protrusion and the bracket may have at least a partially overlapping shape when projected from the inside to the outside of the cell housing.

[0023] According to one embodiment, the insulating component may have a structure integrally formed with the terminal and the bracket by insert molding.

[0024] According to one embodiment, at least one of the terminal and the bracket may include a surface treatment portion on the surface in contact with the insulating component, the surface treatment portion being used to improve the bonding strength with the insulating component.

[0025] According to one embodiment, the surface treatment portion may include a surface with an uneven shape or a surface with pores.

[0026] According to one embodiment, in the state before the terminal assembly is joined to the cover plate, when the terminal assembly is viewed from both sides of the thickness direction of the terminal, the terminal, the insulating component, and the bracket may have shapes that are exposed to the outside from both sides of the thickness direction of the terminal.

[0027] According to one embodiment, with the terminal assembly welded to the inner side of the cover plate, when the terminal assembly is viewed from the inner side of the cover plate, the terminal, the insulating component, and the bracket may each have a shape that is exposed to the outside.

[0028] According to one embodiment, the insulating component may contact only the terminal and the bracket in the space between the outer side of the terminal and the inner side of the bracket.

[0029] According to one embodiment, the terminal assembly may include a first terminal assembly having a first polarity and a second terminal assembly having a second polarity, at least one of the first terminal assembly and the second terminal assembly may include a cladding metal.

[0030] The cover assembly disclosed herein may include: a cover plate including at least one through hole; and a terminal assembly coupled to the cover plate, the terminal assembly including: a terminal; a bracket disposed laterally around the terminal; and an insulating member disposed between the terminal and the bracket, the inner side of the cover plate may have a stepped portion formed around the through hole, at least a portion of the bracket may be disposed on the stepped portion and coupled to the inner side of the cover plate, and the insulating member may have a structure integrally formed with the terminal and the bracket by insert molding.

[0031] According to one embodiment, at least one of the terminal and the bracket includes a surface-treated portion on the surface in contact with the insulating member, the surface-treated portion being used to improve the bonding strength with the insulating member, wherein, when the terminal assembly is welded to the inner side of the cover plate, the terminal, the insulating member, and the bracket have shapes that are respectively exposed to the outside when the terminal assembly is viewed from the inner side of the cover plate.

[0032] (III) Beneficial Effects According to one embodiment of this disclosure, the number of parts and / or structure of the cover assembly can be simplified.

[0033] According to one embodiment of this disclosure, the terminal assembly can be prevented from detaching from the cover plate.

[0034] According to one embodiment of this disclosure, the sealing performance of the cover assembly can be improved between the cover plate and the terminal assembly and / or inside the terminal assembly.

[0035] According to one embodiment of this disclosure, the cover assembly can be easily manufactured.

[0036] According to one embodiment of this disclosure, the manufacturing cost of the cover assembly can be reduced. Attached Figure Description

[0037] Figure 1 This is a perspective view of a battery cell according to one embodiment.

[0038] Figure 2 yes Figure 1 The image shown is an exploded 3D view of the battery cell.

[0039] Figure 3 It is shown Figure 2 A three-dimensional view of the combined state of the middle cover assembly and the electrode assembly.

[0040] Figure 4 It is shown Figure 2 The diagram shows a perspective view of the cover assembly.

[0041] Figure 5 yes Figure 4 The exploded perspective view of the cover assembly is shown.

[0042] Figure 6 This is a schematic diagram showing the assembled state of the terminal assembly.

[0043] Figure 7 It is along Figure 6 A cross-sectional view taken from the I-I' line.

[0044] Figure 8 and Figure 9 It is along Figure 4 A cross-sectional view taken from line II-II', in which Figure 8 This shows the state of the terminal assembly and cover plate being engaged. Figure 9 This shows the status of the current collector connected to the terminal assembly.

[0045] Figures 10 to 13 It is shown Figure 7 Cross-sectional view of a variant of the terminal assembly shown.

[0046] Figure 14 This is an explanatory diagram showing the process of assembling the terminal assembly onto the cover plate.

[0047] Figure 15 This is an explanatory diagram showing the assembly state of the cover assembly, electrode assembly, and cell housing.

[0048] Figure 16 This is a perspective view showing a battery device according to one embodiment.

[0049] Explanation of reference numerals in the attached figures: 100: Battery cell; 110: Battery cell casing 115: Accommodation space; 120: Electrode assembly 120a: First sub-electrode assembly; 120b: Second sub-electrode assembly 121: Electrode tab; 121a: First electrode tab 121b: Second electrode tab; 130: Cover assembly 131: Cover plate; 132: Through hole 133: Stepped section; 135: Vent hole 140: Terminal assembly; 140a: First terminal assembly 140b: Second terminal assembly; 141: Terminal 141a: Main body; 141aa: First region 141ab: Second region; 141b: Protrusion 141t: First surface treatment section; 143: Support 143a: Part One 143b: Part Two 143c: Part Three; 143t: Second Surface Treatment Section 144: Penetration section; 145: Insulating component 145a: Inner part; 145b: Connecting part 145c: Outer portion; 145d: Receiving part 145e: Recessed portion; 150: Current collector. 150a: First current collector; 150b: Second current collector 151: Terminal connection part; 152: Electrode connection part 161: Exhaust cover 162: First insulator 163: Second insulator; 200: Battery assembly 210: Outer shell 211: Main body of the outer shell 215: Outer cover D1: Outer diameter of the protrusion D2: Minimum inner diameter of the bracket; Da: Inner diameter of the through hole. Db: Outer diameter of the third part; L: Overlap length L1: Extension length of the first part; L2: Extension length of the third part. W: Welding section; WD: Welding mechanism Detailed Implementation

[0050] The same reference numerals or symbols used in the accompanying drawings indicate parts or components that perform substantially the same function. For ease of explanation and understanding, the same reference numerals or symbols may also be used in different embodiments. That is, even if components with the same reference numerals are shown in multiple drawings, it does not mean that all the drawings represent the same embodiment.

[0051] In the following description, unless the context clearly indicates a different meaning, singular expressions include plural expressions. Terms such as “comprising” or “constituting” are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0052] Furthermore, in the following description, the terms "upper side," "upper part," "lower side," "lower part," "side," "front," and "rear" are based on the orientation shown in the accompanying drawings. It is stated in advance that if the orientation of the object changes, different terms may be used.

[0053] Furthermore, in this specification and claims, terms containing ordinal numbers such as "first," "second," etc., may be used to distinguish components. These ordinal numbers are used to differentiate identical or similar components from one another and should not limit the meaning of the terms due to their use. For example, the order of use or configuration of components combined with these ordinal numbers should not be interpreted as limited by their numbers. The ordinal numbers may also be used interchangeably as needed.

[0054] The present disclosure will now be described in detail with reference to the accompanying drawings. However, these are merely examples, and the present disclosure is not limited to the specific embodiments described herein.

[0055] The following is for reference Figures 1 to 15 The following describes a battery cell 100 according to one embodiment. This disclosure uses a prismatic battery cell as an example, but the shape of the battery cell 100 can be varied in many ways, such as a cylindrical battery cell, a button cell, etc.

[0056] Figure 1 This is a perspective view of a battery cell 100 according to one embodiment. Figure 2 yes Figure 1 The exploded perspective view of cell 100 shown is as follows. Figure 3 It is shown Figure 2 A perspective view of the middle cover assembly 130 and the electrode assembly 120 in their combined state. Figure 4 It is shown Figure 2 The perspective view of the cover assembly 130 shown. Figure 5 yes Figure 4 An exploded perspective view of the cover assembly 130 shown.

[0057] Reference Figures 1 to 5 According to one embodiment, the battery cell 100 may include: an electrode assembly 120; a battery cell housing 110 for receiving the electrode assembly 120; a cover plate 131 for covering the end of the opening of the battery cell housing 110 and including at least one through hole 132; and a terminal assembly 140 for engaging with the cover plate 131.

[0058] Electrode assembly 120 may include a positive electrode plate, a negative electrode plate, and a separator. The positive and negative electrode plates may be disposed with the separator in between. As an example, electrode assembly 120 may have a wound structure in which the positive electrode plate, negative electrode plate, and separator are wound. However, electrode assembly 120 of this disclosure is not limited to a wound structure. For example, electrode assembly 120 of this disclosure may also have a stacking shape, a zigzag-folding shape, or a stack-folding shape.

[0059] The electrode assembly 120 may include electrode tabs 121. Electrode tabs 121 may include a positive electrode tab connected to a positive electrode plate and a negative electrode tab connected to a negative electrode plate.

[0060] Electrode tabs 121 may be disposed on the side of electrode assembly 120. For example, electrode assembly 120 may include electrode tabs 121 disposed on both sides of the electrode assembly 120 along its length direction (e.g., the X-axis direction). In this disclosure, the length direction of electrode assembly 120 may be defined as the direction in which the longest edge of electrode assembly 120 extends, the thickness direction of electrode assembly 120 may be defined as the direction in which the shortest edge of electrode assembly 120 extends, and the height direction of electrode assembly 120 may be defined as a direction perpendicular to the length direction and the thickness direction.

[0061] Along the length of the electrode assembly 120, electrode tabs 121 can be respectively disposed on both sides of the electrode assembly 120. A positive electrode tab can be disposed on one side of the electrode assembly 120, and a negative electrode tab can be disposed on the other side of the electrode assembly 120. The positive and negative electrode tabs can be disposed on the electrode assembly 120 and face opposite directions. However, in this disclosure, the position of the electrode tabs 121 is not limited to this. For example, the electrode tabs 121 may also include a positive electrode tab and a negative electrode tab respectively disposed on the upper side of the electrode assembly 120.

[0062] Electrode assembly 120 may have a structure in which multiple sub-electrode assemblies are interconnected. Electrode assembly 120 may include a first sub-electrode assembly 120a and a second sub-electrode assembly 120b, the first sub-electrode assembly 120a including a first electrode tab 121a, and the second sub-electrode assembly 120b including a second electrode tab 121b. The first sub-electrode assembly 120a and the second sub-electrode assembly 120b may each include a positive electrode plate, a negative electrode plate, and a separator. Figure 2 and Figure 3 The diagram shows an electrode assembly 120 comprising two sub-electrode assemblies, but the number of sub-electrode assemblies provided in the electrode assembly 120 can be varied in many ways, such as one, three or more, etc.

[0063] Each sub-electrode assembly 120 may include electrode tabs 121, namely a positive electrode tab and a negative electrode tab. The electrode tabs 121 of the electrode assembly 120 may include a first electrode tab 121a disposed in the first sub-electrode assembly 120a and a second electrode tab 121b disposed in the second sub-electrode assembly 120b. The first electrode tab 121a and the second electrode tab 121b may converge to each other in the central region of their respective sub-electrode assemblies 120.

[0064] The first sub-electrode assembly 120a and the second sub-electrode assembly 120b can be joined together by a fixing member T to form an electrode assembly 120. As an example, the fixing member T may include adhesive tape covering at least a portion of the first sub-electrode assembly 120a and the second sub-electrode assembly 120b.

[0065] The cell housing 110 can accommodate the electrode assembly 120. The cell housing 110 is formed with a receiving space 115 for accommodating the electrode assembly 120, and can have a shape with an opening on at least one side. For example, the cell housing 110 can have a shape with an opening on the upper side.

[0066] The receiving space 115 of the cell housing 110 can accommodate the electrode assembly 120, or the electrode assembly 120 and the electrolyte. As an example, the cell housing 110 can have a hexahedral shape with an opening at one end.

[0067] The cover assembly 130 can be combined with the cell housing 110. The cover assembly 130 may include: a cover plate 131 including at least one through hole 132; and a terminal assembly 140 combined with the cover plate 131.

[0068] The cover assembly 130 may include a cover plate 131. The cover assembly 130 may be coupled to the cell housing 110 via the cover plate 131. The cover plate 131 may be coupled to the cell housing 110 and have a plate-like shape. For example, the cover plate 131 may cover the upper end of an opening in the cell housing 110. The cover plate 131 may include at least one through hole 132, with the terminal assembly 140 coupled to the at least one through hole 132.

[0069] The cover plate 131 may include a vent 135, and a vent cap 161 may be combined with the vent 135. The vent cap 161 may be welded to the cover plate 131. When gas is generated inside the cell housing 110, causing the internal pressure of the cell housing 110 to rise, the vent cap 161 may rupture or open. When the internal pressure of the cell housing 110 rises, the vent cap 161 can function to discharge the gas inside the cell housing 110 to the outside of the cell housing 110.

[0070] Terminal assembly 140 can be disposed in through hole 132 of cover plate 131. Terminal assembly 140 can be electrically connected to electrode assembly 120. Terminals of terminal assembly 140 ( Figure 6 141) can be electrically connected to the electrode tab 121 of the electrode assembly 120 via the current collector 150.

[0071] Terminal assembly 140 can be inserted into through hole 132 in a direction from the inside to the outside of cell housing 110. (Refer to...) Figure 5 The terminal assembly 140 can be engaged with the cover plate 131 in a state where it is inserted into the through hole 132 in a direction from the lower side to the upper side. The terminal assembly 140 can be soldered to the lower surface of the cover plate 131. For example, the terminal assembly 140 can be laser soldered to the lower surface of the cover plate 131.

[0072] Terminal assembly 140 may include a first terminal assembly 140a having a first polarity and a second terminal assembly 140b having a second polarity. The first polarity and the second polarity may be different from each other. For example, the first polarity is positive and the second polarity is negative. In this case, the first terminal assembly 140a may include a positive terminal and the second terminal assembly 140b may include a negative terminal. The positive terminal may be electrically connected to the positive terminal tab of the electrode assembly 120, and the negative terminal may be electrically connected to the negative terminal tab of the electrode assembly 120.

[0073] The current collector 150 can connect the electrode tabs 121 of the electrode assembly 120 to the terminals of the terminal assembly 140. Figure 6 141) Electrical connection. The current collector 150 may include a terminal connection portion 151 electrically connected to the terminal 141 and an electrode connection portion 152 electrically connected to the electrode tab 121.

[0074] When the electrode tabs 121 are located on both sides of the electrode assembly 120, the current collector 150 may include a first current collector 150a connected to the electrode tabs 121 located on one side of the electrode assembly 120 and a second current collector 150b connected to the electrode tabs 121 located on the other side of the electrode assembly 120.

[0075] When the electrode tabs 121 are located on both sides of the electrode assembly 120 and the terminal 141 is located on the upper side of the electrode assembly 120, the current collector 150 may have a bent shape. For example, the terminal connection portion 151 and the electrode tab connection portion 152 may have a mutually bent shape. The electrode tab connection portion 152 may have a shape that is bent approximately 90 degrees from the terminal connection portion 151. The current collector 150 may have an approximately "L" shaped cross-section to electrically connect the electrode tabs 121 respectively provided on both sides of the electrode assembly 120 to the terminal 141.

[0076] The first electrode tab 121a of the first sub-electrode assembly 120a and the second electrode tab 121b of the second sub-electrode assembly 120b can be respectively coupled to the tab connection portion 152 of the current collector 150. The current collector 150 can electrically connect the first electrode tab 121a and the second electrode tab 121b to the terminal 141.

[0077] The cover plate 131, terminal assembly 140, and current collector 150 can be combined with each other to form the cover assembly 130. The current collector 150 can be soldered to the electrode assembly 120 while being combined with the terminal assembly 140. That is, the current collector 150 can be combined with the electrode assembly 120 while being provided as the cover assembly 130. The cover assembly 130 can be combined with the electrode assembly 120 via the current collector 150.

[0078] However, the cover assembly 130 of this disclosure is not limited to a configuration including the current collector 150. The cover assembly 130 may or may not include the current collector 150 depending on the position of the electrode tabs 121 of the electrode assembly and / or the position of the terminal assembly 140. For example, when the current collector 150 has a configuration that first engages with the electrode tabs 121 of the electrode assembly 120, the cover assembly 130 may not include the current collector 150. Conversely, when the current collector 150 engages with the terminal assembly 140 first and then with the electrode tabs 121 of the electrode assembly 120, the cover assembly 130 may include the current collector 150.

[0079] The cover assembly 130 may further include a plurality of insulators. The cover assembly 130 may include a first insulator 162 that electrically insulates the cover plate 131 from the current collector 150. A second insulator 163 may be disposed at the lower portion of the current collector 150 or the cover plate 131, the second insulator 163 electrically insulating the electrode assembly 120 from the current collector 150 and from the cover plate 131.

[0080] In this disclosure, an example is shown of a cell housing 110 with an opening at one end, a cover plate 131 attached to the cell housing 110, and a first terminal assembly 140a and a second terminal assembly 140b mounted on a cover plate 131. However, the arrangement of the cell housing 110, cover plate 131, and terminal assembly 140 is not limited to this. For example, the cell housing 110 may have openings at both ends, with cover plates 131 attached to both ends respectively, and at least one of the first terminal assembly 140a and the second terminal assembly 140b may be disposed on the respective cover plates 131.

[0081] This disclosure illustrates a configuration where electrode tabs 121 are located on both sides of the electrode assembly 120 along its length (e.g., the X-axis direction) and terminal assemblies 140 of different polarities are disposed on the upper side of the electrode assembly 120. However, the configuration of the electrode tabs 121 and terminal assemblies 140 is not limited to this. For example, this disclosure can also be applied to a configuration where electrode tabs 121 are located on both sides of the electrode assembly 120 along its length and terminal assemblies 140 are disposed on both sides of the electrode assembly 120 along its length. Furthermore, this disclosure can also be applied to a configuration where electrode tabs 121 and terminal assemblies 140 of different polarities are disposed on the upper side of the electrode assembly 120.

[0082] Furthermore, the current collector 150 can be modified into various shapes depending on the placement of the electrode tabs 121 of the electrode assembly 120 and the terminal assembly 140. For example, in Figure 5 In the diagram, the current collector 150 is shown to have an L-shaped bend, but when the electrode tabs 121 of the electrode assembly 120 and the terminal assembly 140 are arranged opposite each other, the current collector 150 may also have an unbent shape.

[0083] Figure 6 This is a schematic diagram showing the engagement state of the terminal assembly 140. Figure 7 It is along Figure 6 A cross-sectional view taken from the I-I' line. Combined with... Figure 3 and Figure 5 Refer to together Figure 6 and Figure 7 The terminal assembly 140 will be described.

[0084] The terminal assembly 140 may include: a terminal 141 electrically connected to the electrode assembly 120; a bracket 143 disposed around the terminal 141 in the lateral direction of the terminal assembly 140; and an insulating member 145 disposed between the terminal 141 and the bracket 143.

[0085] by Figure 6 Based on the shown state, terminal 141 may have a columnar shape extending in a vertical direction (e.g., the Z-axis direction), and lateral may refer to a horizontal direction perpendicular to the vertical direction. In this disclosure, lateral may include the X-axis direction or the Y-axis direction.

[0086] Terminal 141 can be electrically connected to electrode assembly 120. Terminal 141 can be electrically connected to electrode tab 121 of electrode assembly 120 via current collector 150. Figure 6 Based on the shown state, terminal 141 may have a columnar shape extending in the vertical direction (e.g., the Z-axis direction). The horizontal cross-section of terminal 141 may include a circular, elliptical, or quadrilateral cross-section.

[0087] The bracket 143 can be configured to surround the side of the terminal 141 around the side of the terminal assembly 140. The bracket 143 can be laterally positioned around the terminal 141. The bracket 143 can be spaced apart from the terminal 141. Figure 6 Based on the shown state, the lateral direction of terminal 141 can refer to a horizontal direction perpendicular to the vertical direction (e.g., the Z-axis direction). In this disclosure, the lateral direction of terminal 141 can include the X-axis direction or the Y-axis direction. The interior of bracket 143 can form a space to accommodate terminal 141. The interior of bracket 143 can form a space extending through in the vertical direction.

[0088] An insulating component 145 may be disposed between the terminal 141 and the support 143. The insulating component 145 may be formed by injection molding a polymer as a raw material into the space between the terminal 141 and the support 143.

[0089] The insulating component 145 may have a structure in which it is integrally formed with the terminal 141 and the support 143 through insert molding. For example, after the terminal 141 and the support 143 are placed in an insert injection mold, the terminal 141, the support 143, and the insulating component 145 can be integrally formed by injecting a polymer resin or the like into the insert injection mold. The terminal 141 and the support 143 can be integrally formed through the insulating component 145. Insert molding may include insert injection molding. Since the terminal assembly 140 is formed by insert molding of the terminal 141, the support 143, and the insulating component 145, the terminal assembly 140 can be easily manufactured.

[0090] The insulating component 145 may comprise a crystalline resin from a polymer. When the insulating component 145 is provided with a crystalline resin, the bonding strength of the terminal assembly 140 can be improved.

[0091] Crystalline resins may include one or more selected from the group consisting of polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyether etherketone (PEEK), polyamide (PA), polyethylene terephthalate (PET), polyoxymethylene (POM), polypropylene (PP), polyethylene (PE), and polyimide (PI).

[0092] The support 143 may include: a second portion 143b extending along a first direction; a first portion 143a extending laterally from a first side end of the second portion 143b; and a third portion 143c, spaced apart from the first portion 143a in the first direction and extending laterally from a second side end of the second portion 143b. Here, the first direction Z can be defined as the vertical direction in which the second portion 143b of the support 143 extends, and may include not only... Figure 6 and Figure 7 The Z-axis direction shown may also include a direction with a predetermined inclination relative to the Z-axis direction. That is, the first direction is not limited to the up and down direction.

[0093] The first portion 143a extends laterally inward from the second portion 143b, and the third portion 143c extends laterally outward from the second portion 143b. Here, "latitudinal inward" can be defined as a direction toward the center of terminal 141, and "latitudinal outward" can be defined as a direction away from terminal 141. The first portion 143a extends laterally inward from the upper end of the second portion 143b, and the third portion 143c extends laterally outward from the lower end of the second portion 143b.

[0094] When the bracket 143 has a shape that extends in different directions at both ends of the second part 143b, the bracket 143 can be easily manufactured by stamping.

[0095] The third portion 143c of the bracket 143 extends laterally outward from the second portion 143b, and the bracket 143 may not include the portion extending laterally inward from the lower end of the second portion 143b. In this case, the insulating member 145 can be easily filled into the space between the second portion 143b and the terminal 141, and the molding of the insulating member 145 can be performed smoothly.

[0096] The first portion 143a and the third portion 143c may have a shape that bends from both ends of the second portion 143b. The bracket 143 may include two bend lines. The bracket 143 may have a shape that bends between the first portion 143a and the second portion 143b, and between the second portion 143b and the third portion 143c.

[0097] Since the bracket 143 has a shape that bends in different directions based on two bend lines, the bracket 143 can be easily manufactured by stamping.

[0098] In the lateral direction, the length L2 of the third part 143c extending from the second part 143b can be greater than the length L1 of the first part 143a extending from the second part 143b.

[0099] The third part 143c extends laterally and outward from the lower end of the second part 143b by a second length L2, and the first part 143a extends laterally and inward from the upper end of the second part 143b by a first length L1. When the second length L2 is greater than the first length L1, the third part 143c and the cover plate ( Figure 5 (131) The contact area can be lengthened, thereby lengthening the electrolyte leakage path and thus preventing electrolyte leakage.

[0100] The insulating component 145 may include: an inner portion 145a, which fills the space between the outer side of the terminal 141 and the inner side of the bracket 143; an outer portion 145c, which is opposite to the inner portion 145a across the bracket 143 and covers the outer side of the bracket 143; and a connecting portion 145b, which connects the inner portion 145a and the outer portion 145c.

[0101] The inner portion 145a fills the space between the terminal 141 and the bracket 143, and insulates the terminal 141 from the bracket 143. The inner portion 145a also insulates the outer surface of the terminal 141 from the second portion 143b of the bracket 143. The inner portion 145a may also insulate the terminal 141 from the cover plate 131 attached to the bracket 143. The outer portion 145c and the connecting portion 145b are shaped to cover the outer surface of the bracket 143, thus more fully ensuring insulation between the terminal 141 and the bracket 143.

[0102] A receiving portion 145d for accommodating the support 143 can be formed between the inner portion 145a, the connecting portion 145b, and the outer portion 145c. The receiving portion 145d can be a space covered by the inner portion 145a, the connecting portion 145b, and the outer portion 145c.

[0103] Terminal 141 includes a protrusion 141b that protrudes laterally and outward, and insulating member 145 may include a recess 145e that accommodates the protrusion 141b.

[0104] Terminal 141 may include a body 141a extending in a vertical direction and a protrusion 141b protruding laterally outward from the outer side of the body 141a. When the protrusion 141b is formed on terminal 141, the insulating member 145 disposed between the support 143 and the protrusion 141b of terminal 141 may include a recess 145e accommodating the protrusion 141b. The protrusion 141b of terminal 141 and the recess 145e of insulating member 145 can increase the contact area between terminal 141 and insulating member 145, thereby improving the bonding strength between terminal 141 and insulating member 145. When the protrusion 141b is formed on terminal 141, the electrolyte leakage path becomes longer, thus preventing electrolyte leakage.

[0105] In the terminal assembly 140, the upper surface of the terminal 141 may protrude further outward (upper side) than the upper surface of the insulating member 145. This allows for easy mounting of electrical connection components such as busbars onto the upper surface of the terminal 141.

[0106] At least one of the terminal 141 and the bracket 143 may include surface treatment portions 141t and 143t on the surface in contact with the insulating member 145, the surface treatment portions 141t and 143t being used to improve the bonding strength with the insulating member 145.

[0107] Terminal 141 and bracket 143 may be made of metallic material. At least one of terminal 141 and bracket 143 may be surface treated before insert molding. At least one of terminal 141 and bracket 143 may include surface-treated portions 141t and 143t formed by surface treatment. Surface-treated portions 141t and 143t may include a first surface-treated portion 141t formed on the surface of terminal 141 and a second surface-treated portion 143t formed on the surface of bracket 143. Surface-treated portions 141t and 143t may be formed on the surface of terminal 141 and the surface of bracket 143, respectively.

[0108] A first surface treatment portion 141t formed on the surface of terminal 141 may be provided on at least a portion of the surface of terminal 141 that contacts the insulating member 145. For example, the first surface treatment portion 141t may be provided on at least a portion of the outer side surface of the body 141a, at least a portion of the surface of the protrusion 141b, or at least a portion of the outer side surface of the body 141a and the surface of the protrusion 141b. Alternatively, the first surface treatment portion 141t may be provided on the entire surface of terminal 141.

[0109] A second surface treatment portion 143t formed on the surface of the support 143 may be provided on at least a portion of the surface of the support 143 that contacts the insulating member 145. For example, the second surface treatment portion 143t may be provided on at least a portion of the surfaces of the first portion 143a, the second portion 143b, and the third portion 143c that contact the insulating member 145. Alternatively, the second surface treatment portion 143t may be provided on the entire surface of the support 143.

[0110] When surface treatment portions 141t and 143t are respectively provided on the surfaces of terminal 141 and support 143, the bonding strength of terminal assembly 140 can be improved because the insulating member 145 is bonded to the first surface treatment portion 141t of terminal 141 and the second surface treatment portion 143t of support 143. Alternatively, surface treatment portions 141t and 143t can also be formed on either the surface of terminal 141 or the surface of support 143, in which case the bonding strength of terminal assembly 140 can also be improved.

[0111] Surface treatment can increase the contact area between the terminal 141 and the insulating component 145 and / or between the bracket 143 and the insulating component 145, and improve the bonding force between the terminal 141 and the insulating component 145 and / or between the bracket 143 and the insulating component 145.

[0112] Terminal 141 and bracket 143 can be integrally molded with insulating component 145 via insert injection molding after surface treatment. In this case, the bonding force between insulating component 145 and terminal 141 and bracket 143 is increased, and the space between terminal 141 and bracket 143 can be sealed by insulating component 145. That is, by surface treating terminal 141 and bracket 143, leakage can be prevented between the interface of terminal 141 and insulating component 145, and between the interface of bracket 143 and insulating component 145, and the bonding force between the interfaces is improved. Thus, the sealing performance of cover assembly 130 can be ensured even if a gasket for sealing is not provided on cover assembly 130. However, this disclosure does not exclude the use of gasket.

[0113] Surface treatment can be performed by pressing, shot blasting, laser processing, etching using chemicals, or forming an oxide film. However, the surface treatment method is not limited to these; various surface treatment methods that can increase the bonding strength between the terminals 141 and / or the brackets 143 made of metal materials and the insulating components 145 can be applied.

[0114] For example, terminal 141 and / or bracket 143 may undergo a surface treatment with polyvinyl alcohol (PVA) adhesive after chromium (Cr) film treatment.

[0115] A chromium (Cr) film treatment can be used to form a film layer composed of chromium hydroxide (Cr(OH)3) or chromium oxide (Cr2O3) on the surface of the terminal 141 and / or the support 143. Here, the chromium film layer can increase the chemical activity of the metal surface, thereby improving the interfacial adhesion with the insert-molded insulating component 145.

[0116] In addition, the insulating component 145 may comprise PP-g-MA grafted with maleic anhydride onto a polypropylene-based resin, and may be manufactured by blending with polyphenylene sulfide (PPS) and glass fiber reinforced polymer (GF polymer).

[0117] PP-g-MA can enhance adhesion through chemical interaction with a chromium (Cr) film formed on a metal surface.

[0118] Therefore, by molding the insulating component 145 containing PP-g-MA onto the terminal 141 and / or support 143 which have a chromium film layer or chromium oxide film formed by insert molding, the chemical mechanical bonding force between the metal surface and the resin can be greatly improved.

[0119] Here, the process for forming a chromium film (Cr(OH)3) or chromium oxide film (Cr2O3) can include, in sequence, an electrolytic degreasing process, a rinsing process, a chromium film forming process by impregnation treatment containing chromium components, a rinsing process, a post-treatment impregnation process containing non-chromium (non-Cr) components, a rinsing process, and a drying process.

[0120] Here, the post-treatment impregnation process may further include the step of applying a PVA adhesive (e.g., a polymer-based organic film-forming agent) to the surface to form a surface coating. By applying the PVA adhesive, corrosion resistance and durability can be ensured.

[0121] In addition, terminals 141 and / or supports 143 may be surface-treated with amine groups (e.g., –(CH2)3–NH2) imparted to the surface using a silane coupling agent, namely 3-aminopropyltriethoxysilane (APTES).

[0122] The insulating component 145 can be insert-molded after imparting carboxyl groups (e.g., -COOH) to polyphenylene sulfide (PPS) and glass fiber reinforced polymer (GF polymer).

[0123] In this way, the amine groups of the terminal 141 and / or the support 143 and the carboxyl groups of the insulating component 145 can form amide bonds (-CO-NH-), thereby improving the interfacial bonding force between the two.

[0124] Here, the process of forming amine groups on the surface of terminal 141 and / or support 143 using 3-aminopropyltriethoxysilane (APTES) can sequentially include an electrolytic degreasing process, a rinsing process, an acid treatment process using nitric acid (HNO3) solution or sodium hydroxide (NaOH) solution, an impregnation process using a 1-2% solution of 3-aminopropyltriethoxysilane (APTES) (ethanol or water mixture), a rinsing process, and a drying process.

[0125] In addition, terminals 141 and / or supports 143 may also be surface-treated to impart epoxy groups (e.g., -COC-) to the surface using a silane coupling agent, namely γ-glycidoxypropyltrimethoxysilane (GPTMS).

[0126] The insulating component 145 can be insert-molded after imparting carboxyl groups (e.g., -COOH) to polyphenylene sulfide (PPS) and glass fiber reinforced polymer (GF polymer), thereby allowing the epoxy groups of the terminal 141 and / or the support 143 and the carboxyl groups of the insulating component 145 to form a bond (e.g., –COO–CH2–CH(OH)–), thereby improving the interfacial bonding strength.

[0127] Here, the process of forming epoxy groups on the surface of terminal 141 and / or support 143 using a silane coupling agent, namely 3-glycidoxypropyltrimethoxysilane (GPTMS), can sequentially include an electrolytic degreasing process, a water washing process, an acid treatment process using nitric acid (HNO3) solution or sodium hydroxide (NaOH) solution, an impregnation process using a mixture of 3-glycidoxypropyltrimethoxysilane (GPTMS) and ethanol or water, a water washing process, and a drying process.

[0128] Surface treatment portions 141t and 143t may include surfaces with uneven shapes or surfaces with pores. Uneven surfaces or pores can be formed by surface treatment to create recesses on the surfaces of terminal 141 or support 143. Uneven surfaces may include micro-protrusions and / or micro-dimples. Pores may include nano- or micro-sized micropores formed on the surfaces of terminal 141 or support 143 through surface treatment. Embodiments of this disclosure can integrally mold terminal 141, support 143, and insulating component 145 using insert molding, thus simplifying the construction of terminal assembly 140. Therefore, according to embodiments, compared to conventional terminal connection structures using rivets, the manufacturing cost of cover assembly 130 can be reduced, and the assembly process can be simplified. Furthermore, when surface treatment portions 141t and 143t are provided on the surfaces of at least one of terminal 141 and support 143, sealing between terminal 141 and support 143 can be ensured even without a gasket.

[0129] Before the terminal assembly 140 is joined to the cover plate 131, when the terminal assembly 140 is viewed from both sides of the thickness direction of the terminal 141, the terminal 141, the insulating member 145 and the bracket 143 may have shapes that are exposed to the outside from both sides of the thickness direction of the terminal 141.

[0130] by Figure 7 Taking the terminal assembly 140 as an example, when viewed from the upper side downwards in the thickness direction of the terminal 141, the connection portion 145b of the insulating member 145 and the third portion 143c of the bracket 143 may be exposed to the outside. Conversely, when viewed from the lower side upwards in the thickness direction of the terminal 141, the inner portion 145a of the insulating member 145 and the third portion 143c of the bracket 143 may be exposed to the outside. In this case, unlike the prior art where a gasket is additionally provided for sealing, the sealing between the terminal 141 and the bracket 143 can be ensured even without a gasket.

[0131] The insulating component 145 may contact only the terminal 141 and the bracket 143 in the space between the outer side of the terminal 141 and the inner side of the bracket 143. For example, a gasket for sealing may not be provided in the space between the outer side of the terminal 141 and the inner side of the bracket 143. According to one embodiment, the number of components in the terminal assembly 140 is reduced due to the absence of a gasket, and the structure can be simplified. Furthermore, the cover assembly 130 can be easily manufactured, and manufacturing costs can be reduced.

[0132] Figure 8 and Figure 9 It is along Figure 4 A cross-sectional view taken from line II-II'. Figure 8 This shows the terminal assembly 140 engaged with the cover plate 131. Figure 9 This shows the current collector 150 connected to the terminal assembly 140.

[0133] Reference Figure 8 and Figure 9 The cover assembly 130 may include a cover plate 131 and a terminal assembly 140.

[0134] The cover plate 131 may include a stepped portion 133, the stepped portion 133 being formed on the cover plate 131 facing the electrode assembly ( Figure 12 The terminal assembly 140 may include a terminal 141, a support 143, and an insulating component 145.

[0135] At least a portion of the support 143 of the terminal assembly 140 may be disposed on the step portion 133 and engaged with the inner side of the cover plate 131. Here, the inner side of the cover plate 131 may be defined as the surface of the cover plate 131 facing the electrode assembly 120.

[0136] Terminal assembly 140 can extend from the cell housing ( Figure 2 The inner side of the terminal assembly 140 is inserted into the through hole 132 in the direction of outward. That is, the terminal assembly 140 is inserted into the through hole 132 through the inner side (lower surface) of the cover plate 131, and the terminals 141 of the terminal assembly 140 can be exposed to the outside of the cell housing 110 through the outer side (upper surface) of the cover plate 131. In this case, the third part 143c of the bracket 143 can contact the stepped portion 133 formed on the inner side of the cover plate 131.

[0137] The bracket 143 can be welded to the inner side of the cover plate 131 while it is positioned on the step portion 133. The welding mechanism WD can perform welding in a direction from the inner side of the cover plate 131 toward the outer side. The welding mechanism WD may include a laser welding machine that irradiates a laser. A weld portion W can be formed at the portion where the edge of the bracket 143 contacts the inner side of the cover plate 131.

[0138] The third part 143c of the bracket 143 can be placed on the step portion 133 and welded to the inner side of the cover plate 131. The cover plate 131 is welded to the third part 143c of the bracket 143, and the cover plate 131 and the third part 143c can be joined by a weld joint W. The third part 143c of the bracket 143 and the inner side of the cover plate 131 can be laser welded.

[0139] The weld portion W may include a weld line formed around the periphery of the bracket 143. When the terminal 141 has a circular cross-section, the weld portion W may be provided as circular.

[0140] The outer diameter Db of the third part 143c of the bracket 143 can be larger than the inner diameter Da of the through hole 132. The third part 143c of the bracket 143 is mounted on the step portion 133 on the inner side of the cover plate 131 and can be engaged with the cover plate 131 in a state of contact with the step portion 133 formed around the through hole 132.

[0141] Because the third portion 143c of the bracket 143 is provided on the stepped portion 133 on the inner side of the cover plate 131, the cover plate 131 can restrict the deformation or movement of the terminal assembly 140 in the outward direction of the cover plate 131. Therefore, when the pressure inside the cell housing 110 increases, the terminal assembly 140 can be prevented from separating from the cover plate 131. In addition, since the cover plate 131 restricts the movement or deformation of the terminal assembly 140, the sealing force between the terminal assembly 140 and the cover plate 131 can be prevented from decreasing or the seal from being broken.

[0142] The third part 143c extends laterally and outward from the lower end of the second part 143b by a second length L2, and the first part 143a extends laterally and inward from the upper end of the second part 143b by a first length L1. When the second length L2 is greater than the first length L1, the third part 143c and the cover plate ( Figure 5 (131) The contact area can be lengthened, thereby lengthening the electrolyte leakage path and preventing electrolyte leakage.

[0143] With the terminal assembly 140 welded to the inner side of the cover plate 131, when the terminal assembly 140 is viewed from the inner side of the cover plate 131, the terminal 141, the insulating component 145, and the bracket 143 may each have a shape that is exposed to the outside.

[0144] by Figure 9Taking the terminal assembly 140 and cover plate 131 as examples, when the terminal assembly 140 is viewed from the inner side of the cover plate 131, the terminal 141, the insulating member 145, and the third portion 143c of the bracket 143 can each be exposed to the outside. In this case, unlike the prior art with a gasket, the sealing between the terminal 141 and the bracket 143 can be ensured even without a gasket. According to one embodiment, since no gasket is provided, the number of parts in the terminal assembly 140 is reduced, and the structure can be simplified. Furthermore, the cover assembly 130 can be easily manufactured, and manufacturing costs can be reduced.

[0145] Reference Figure 9 With the terminal assembly 140 welded to the cover plate 131, the inner side of the cover plate 131 can be covered by a first insulator 162. The first insulator 162 can electrically insulate the cover plate 131 from the current collector 150. Afterwards, the terminal connection portion 151 of the current collector 150 can be electrically connected to the terminal 141. The current collector 150 and the terminal 141 can be joined by welding, such as laser welding. After the current collector 150 and the terminal 141 are joined, a second insulator 163 can be provided at the lower part of the current collector 150 or the cover plate 131. The second insulator 163 can electrically insulate the electrode assembly ( Figure 2 Electrical insulation is provided between the electrode assembly 120 and the current collector 150, and between the electrode assembly 120 and the cover plate 131.

[0146] Figures 10 to 13 It is shown Figure 7 Cross-sectional view of a variant of the terminal assembly 140 shown. Figures 10 to 13 The terminal assembly 140 shown can also be applied to Figures 1 to 5 100 cells.

[0147] If passed Figures 1 to 5 The terminal assembly 140 may include a first terminal assembly 140a having a first polarity and a second terminal assembly 140b having a second polarity.

[0148] Reference Figure 10 At least one of the first terminal assembly 140a and the second terminal assembly 140b may include a clad metal.

[0149] For example, the negative terminal 141 may contain a cladding metal. The body 141a of the terminal 141 may include a first region 141aa exposed to the outside of the cover plate 131 and a second region 141ab bonded to the current collector 150. The first region 141aa may contain an aluminum-containing material, and the second region 141ab may contain a copper-containing material.

[0150] Due to the current collector on the negative electrode side ( Figure 5The second region 141ab is made of a copper-containing material, thus reducing welding defects when welding the current collector to the second region 141ab. Furthermore, since copper has a lower resistance than aluminum, less heat is generated and energy loss is reduced when a portion of the negative terminal 141 contains a copper-containing material compared to when the entire negative terminal 141 is made of aluminum or an aluminum alloy. When a cladding metal containing both copper (copper or copper alloy) and aluminum (aluminum or aluminum alloy) is applied to the terminal 141, galvanic corrosion of the terminal 141 can be prevented or delayed.

[0151] Reference Figure 11 The support 143 includes a perforated through-hole 144, and the insulating member 145 may have a shape that fills the through-hole 144. The through-hole 144 may be formed in the second portion 143b of the support 143, but its position or number may be varied. When the through-hole 144 is formed on the support 143, the bonding strength between the insulating member 145 and the support 143 can be increased because the insulating member 145 can fill the through-hole 144.

[0152] Reference Figure 12 Terminal 141 may include a protrusion 141b that protrudes laterally and outward. The outer diameter D1 of the protrusion 141b may be larger than the minimum inner diameter D2 of the bracket 143. The minimum inner diameter D2 of the bracket 143 may correspond to the inner diameter of the first portion 143a.

[0153] In this configuration, when projected along a direction from the inside to the outside of the cell housing 110, the protrusion 141b and the bracket 143 may have shapes that at least partially overlap each other. For example, the protrusion 141b of the terminal 141 may have a dimension that overlaps with the first portion 143a of the bracket 143 in the vertical direction. The protrusion 141b and the bracket 143 may overlap each other with an overlap length L.

[0154] When the cell casing ( Figure 2 When the internal pressure of the 110 increases and the terminal 141 is subjected to an outward force, the first part 143a of the bracket 143 can function as a stop to restrict the movement of the protrusion 141b of the terminal 141. Therefore, the terminal 141 can be prevented from separating from the insulating member 145.

[0155] and Figure 7 Compared to the terminal assembly shown, Figure 13 The terminal assemblies shown differ in the shape of the insulating component 145. That is, in Figure 13In the illustrated embodiment, the insulating member 145 may include an inner portion 145a filled between the outer side of the terminal 141 and the inner side of the support 143, and may have a configuration that does not cover the outer side of the support 143. Other configurations besides the shape of the insulating member 145 may be applied. Figure 7 Description of the terminal assembly shown.

[0156] The following is for reference Figure 14 and Figure 15 The overall assembly process of battery cell 100 is explained. Figure 14 and Figure 15 Example Figures 1 to 9 The battery cell 100 is shown. The overall assembly process of the battery cell 100 can be modified in various ways depending on the arrangement and structure of the electrode assembly 120, current collector 150, cover plate 131, and terminal assembly 140.

[0157] Figure 14 This is an explanatory diagram showing the process of assembling the terminal assembly 140 onto the cover plate 131.

[0158] Reference Figure 14 Terminal 141, bracket 143, and insulating component 145 can be provided as terminal assembly 140 by insert molding. Cover 131 may include vent 135, which can be coupled to vent cover 161. Vent cover 161 can be welded to vent 135.

[0159] The terminal assembly 140 can then be assembled into the through hole 132 of the cover plate 131. The terminal assembly 140 is inserted into the through hole 132 through the inner side (lower side) of the cover plate 131, and the terminals 141 of the terminal assembly 140 can be exposed to the outside of the cell housing 110 through the outer side (upper side) of the cover plate 131.

[0160] The terminal assembly 140 can be welded to the inner side of the cover plate 131 while it is positioned on the inner side of the cover plate 131. A weld portion W can be formed at the portion where the edge of the terminal assembly 140 contacts the inner side of the cover plate 131. The weld portion W can be formed around the periphery of the terminal assembly 140.

[0161] After the terminal assembly 140 is welded to the cover plate 131, a first insulator 162 for insulation can be provided on the inner side of the cover plate 131.

[0162] Figure 15 This is an explanatory diagram showing the assembled state of the cover assembly 130, the electrode assembly 120, and the cell housing 110.

[0163] Reference Figure 15With the terminal assembly 140 mounted on the cover plate 131, the current collector 150 can be electrically connected to the terminal assembly 140. For example, the current collector 150 may include a terminal connection portion 151 electrically connected to the terminal assembly 140 and a tab connection portion 152 electrically connected to the electrode assembly. The terminal connection portion 151 of the current collector 150 may be welded to the terminal assembly 140. The cover plate 131, the terminal assembly 140, and the current collector 150 may be provided as a cover assembly 130.

[0164] Subsequently, the electrode tabs 121 of the electrode assembly 120 can be electrically connected to the current collector 150. The electrode tabs 121 can be welded to the tab connection portion 152 of the current collector 150.

[0165] Finally, the electrode assembly 120 and the cover assembly 130 can be disposed in the receiving space 115 of the cell housing 110 in a mutually coupled state, and the cell housing 110 and the cover plate 131 can be joined together by welding.

[0166] Figure 16 This is a perspective view showing a battery device 200 according to one embodiment.

[0167] Reference Figure 16 According to one embodiment, the battery device 200 may include a plurality of battery cells 100 and a housing 210 that accommodates the plurality of battery cells 100.

[0168] At least one of the plurality of battery cells 100 provided in the battery device 200 may be used with reference. Figures 1 to 15 At least one of the cells 100 described. Figures 1 to 15 The explanation can also be applied to Figure 16 The battery cell 100 provided in the battery device 200.

[0169] The battery device 200 disclosed herein is not limited in its specific type as long as it includes multiple battery cells 100. For example, the battery device 200 of this disclosure is defined as including battery modules, battery packs, or energy storage devices, etc.

[0170] The housing 210 can provide space to accommodate multiple battery cells 100. The housing 210 may include: a housing body 211, including space to accommodate multiple battery cells 100; and a housing cover 215, covering the upper side of the multiple battery cells 100.

[0171] The above description is merely an example of applying the principles of this disclosure, and other constructions may be included without departing from the scope of this utility model. Furthermore, in the foregoing embodiments, some components may be omitted, and the embodiments may be combined with each other.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; The battery cell housing houses the electrode assembly; A cover plate that covers the end of the opening of the cell housing and includes at least one through hole; as well as Terminal assembly, combined with the cover plate, The terminal assembly includes: Terminals are electrically connected to the electrode assembly; A bracket, disposed laterally around the terminal assembly; and An insulating component is disposed between the terminal and the bracket. The cover plate includes a stepped portion formed on the surface of the cover plate facing the electrode assembly and around the through hole. At least a portion of the bracket is disposed on the stepped portion and engages with the inner side of the cover plate, the inner side of the cover plate being the surface of the cover plate facing the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The terminal assembly is inserted into the through hole in a direction from the inside to the outside of the cell housing. The bracket is welded to the inner side of the cover plate when it is positioned on the stepped portion.

3. The battery cell according to claim 1, characterized in that, The support includes: The second part extends along the first direction; The first portion extends laterally from the first side end of the second portion; and The third portion is spaced apart from the first portion in the first direction and extends laterally from the second side end of the second portion. The first portion extends laterally inward from the second portion. The third part extends outward from the second part toward the side.

4. The battery cell according to claim 3, characterized in that, The third part of the bracket is placed on the stepped portion and welded to the inner side of the cover plate.

5. The battery cell according to claim 3, characterized in that, The first part and the third part have a shape that bends from both ends of the second part.

6. The battery cell according to claim 3, characterized in that, The outer diameter of the third part is larger than the inner diameter of the through hole.

7. The battery cell according to claim 3, characterized in that, In the lateral direction, the length of the third portion extending from the second portion is greater than the length of the first portion extending from the second portion.

8. The battery cell according to claim 1, characterized in that, The insulating component includes: The inner portion is filled between the outer side of the terminal and the inner side of the bracket; The outer portion, separated from the inner portion by the bracket, and covering the outer surface of the bracket; and The connecting portion connects the inner portion to the outer portion.

9. The battery cell according to claim 1, characterized in that, The support includes a perforated through portion. The insulating component has a shape that fills the through-hole.

10. The battery cell according to claim 1, characterized in that, The terminal includes a protrusion that projects outward toward the side. The insulating component includes a recess that accommodates the protrusion.

11. The battery cell according to claim 10, characterized in that, The outer diameter of the protrusion is larger than the minimum inner diameter of the bracket. When projected from the inside to the outside of the cell housing, the protrusion and the bracket have a shape that at least partially overlaps each other.

12. The battery cell according to any one of claims 1 to 11, characterized in that, The insulating component has a structure integrally formed with the terminal and the bracket by insert molding.

13. The battery cell according to claim 12, characterized in that, At least one of the terminal and the bracket includes a surface-treated portion on the surface in contact with the insulating component, the surface-treated portion being used to improve the bonding strength with the insulating component.

14. The battery cell according to claim 13, characterized in that, The surface treatment section includes a surface with an uneven shape or a surface with pores.

15. The battery cell according to claim 12, characterized in that, Before the terminal assembly is joined to the cover plate, when the terminal assembly is viewed from both sides of the thickness direction of the terminal, the terminal, the insulating component, and the bracket have shapes that are exposed to the outside from both sides of the thickness direction of the terminal.

16. The battery cell according to claim 12, characterized in that, With the terminal assembly welded to the inner side of the cover plate, when the terminal assembly is viewed from the inner side of the cover plate, the terminal, the insulating component, and the bracket have shapes that are exposed to the outside.

17. The battery cell according to claim 12, characterized in that, The insulating component is located in the space between the outer side of the terminal and the inner side of the bracket, and only contacts the terminal and the bracket.

18. The battery cell according to any one of claims 1 to 11, characterized in that, The terminal assembly includes a first terminal assembly having a first polarity and a second terminal assembly having a second polarity. At least one of the first terminal assembly and the second terminal assembly includes a cladding metal.

19. A cover assembly, characterized in that, include: Cover plate, including at least one through hole; as well as Terminal assembly, combined with the cover plate, The terminal assembly includes: terminal; A bracket, disposed laterally around the terminal assembly; and An insulating component is disposed between the terminal and the bracket. The inner surface of the cover plate has a stepped portion, which is formed around the through hole. At least a portion of the bracket is disposed on the stepped portion and engages with the inner surface of the cover plate. The insulating component has a structure integrally formed with the terminal and the bracket by insert molding.

20. The cover assembly according to claim 19, characterized in that, At least one of the terminal and the bracket includes a surface-treated portion on the surface in contact with the insulating component, the surface-treated portion being used to improve the bonding strength with the insulating component. With the terminal assembly welded to the inner side of the cover plate, when the terminal assembly is viewed from the inner side of the cover plate, the terminal, the insulating component, and the bracket have shapes that are exposed to the outside.

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