Battery cell and manufacturing method thereof

Abstract

The invention relates to a battery cell capable of improving productivity and a manufacturing method of the battery cell. The battery cell comprises an electrode assembly; a main body case having an opening on one surface thereof, the electrode assembly being accommodated inside the main body case through the opening; a coupling region provided adjacent to the opening along at least a portion of the periphery of the opening in one region of the main body case; a coupling hole penetrating the main body housing in the coupling area; a cover portion including a terminal portion electrically connecting the electrode assembly to the outside, and coupled with the main body case in the coupling region to cover the opening portion; and an adhesive member positioned on an inner side surface of the main body case and an outer side surface of the main body case in the bonding region through the bonding hole and cured to bond the cover portion and the main body case.

Description

Technical Field

[0001] This disclosure relates to a battery cell and a method for manufacturing the same. More specifically, it relates to a battery cell with improved productivity and a method for manufacturing the same. Background Technology

[0002] The manufacturing process of a battery cell (or secondary battery) includes inserting an electrode assembly consisting of a positive electrode, a negative electrode, and a separator into a can (or main housing), and then combining and sealing the can (housing or main housing) with a cap (cap assembly or cover).

[0003] Conventional battery cell manufacturing processes use welding to seal the can and cap. However, if there is a large gap between the two components when joining the can and cap, welding cannot be completed properly, making it difficult to ensure a seal. Furthermore, during the welding process, metallic foreign objects may enter the interior, degrading the performance of the electrode assembly. Summary of the Invention

[0004] Technical issues

[0005] First, according to one aspect of this disclosure, the technical problem to be solved is to improve the productivity of battery cells by improving the manufacturing process of the battery cells.

[0006] Second, according to another aspect of this disclosure, the technical problem to be solved is to improve the stability and lifespan of the battery cell.

[0007] Third, according to another aspect of this disclosure, the technical problem to be solved is to provide a battery cell and a method thereof that can replace welding in the battery cell manufacturing process while ensuring the sealing of the can (outer shell or main body shell) and the cap (cap assembly or cover).

[0008] Fourth, according to another aspect of this disclosure, the technical problem to be solved is to increase the bonding force between the can (outer shell or main shell) and the cap (cap assembly or cover).

[0009] Furthermore, the battery cells disclosed herein can be widely used in electric vehicles, battery charging stations, energy storage systems (ESS), and other green technologies such as solar power generation and wind power generation that utilize batteries. In addition, the battery cells disclosed herein can be used in eco-friendly mobility devices, including electric vehicles and hybrid vehicles, to mitigate climate change by reducing air pollution and greenhouse gas emissions.

[0010] Technical solution

[0011] The battery cell according to this disclosure may include: an electrode assembly; a main housing having an opening on one side, the electrode assembly being received inside the main housing through the opening; a bonding region being disposed adjacent to the opening along at least a portion of the periphery of the opening in a region of the main housing; a bonding hole penetrating the main housing in the bonding region; a cover including a terminal portion electrically connecting the electrode assembly to the outside, and bonding with the main housing in the bonding region to cover the opening; and an adhesive member located on the inner and outer sides of the main housing in the bonding region through the bonding hole and cured to bond the cover and the main housing.

[0012] At least a portion of the adhesive component may be located in the bonding hole.

[0013] It may have multiple bonding holes, and at least a portion of the adhesive components can be connected to each other on the inner surface of the main body housing through at least a portion of the bonding holes.

[0014] The adhesive component may comprise a polyolefin-based polymer.

[0015] The adhesive component can be used to bond the cover and the main body shell by heating and pressurizing at a preset adhesive temperature and adhesive pressure.

[0016] In a direction parallel to the opening, the cross-sectional area of ​​the cover can be greater than or equal to the cross-sectional area of ​​the main body shell.

[0017] In addition, the roughness of the outer surface of the main body shell in the bonding region may be different from the roughness of the outer surface of the main body shell located outside the bonding region.

[0018] Specifically, the roughness of the outer surface of the main body shell in the bonding region can be greater than the roughness of the outer surface of the main body shell located outside the bonding region.

[0019] Additionally, the cover may include: a cover opposite face, opposite to the opening; and a cover side face, which bends and extends from each corner of the cover opposite face toward the main body housing, wherein the cover side face, when engaged with the engagement area, can prevent the engagement hole from being exposed to the outside.

[0020] When the cover is attached to the attachment area, the side of the cover and the outer side of the main body shell located outside the attachment area can form a step difference.

[0021] When the cover is attached to the attachment area, the side of the cover may protrude outward from the outer side of the main body shell located outside the attachment area.

[0022] In a direction parallel to the opening, one cross-sectional area of ​​the main body shell in the joining region may be smaller than another cross-sectional area of ​​the main body shell located outside the joining region, and the same as one cross-sectional area of ​​the cover. When the cover is joined to the joining region, the side surface of the cover may form a coplanar surface with the outer side surface of the main body shell located outside the joining region.

[0023] Specifically, in a direction parallel to the opening, one cross-sectional area of ​​the main body shell in the joining region may be smaller than another cross-sectional area of ​​the main body shell located outside the joining region and one cross-sectional area of ​​the cover. When the cover is joined to the joining region, the side of the cover may form a step with the outer side of the main body shell located outside the joining region.

[0024] Additionally, the opening may include: a first opening formed on one side of the main body housing; and a second opening formed on the other side of the main body housing opposite to the first side of the main body housing. The mating region may include: a first mating region disposed adjacent to the first opening along at least a portion of the periphery of the first opening in one region of the main body housing; and a second mating region disposed adjacent to the second opening along at least a portion of the periphery of the second opening in another region of the main body housing. The mating hole may include: a first mating hole penetrating the main body housing in the first mating region; and a second mating hole penetrating the main body housing in the second mating region. The cover may include: a first cover attached to the first mating region to cover the first opening; and a second cover attached to the second mating region to cover the second opening.

[0025] The adhesive component may further include: a first adhesive component, which is located on the inner side and the outer side of the main body shell in the first bonding area through the first bonding hole and is cured to bond the first cover and the main body shell; and a second adhesive component, which is located on the inner side and the outer side of the main body shell in the second bonding area through the second bonding hole and is cured to bond the second cover and the main body shell.

[0026] In addition, there may be a plurality of first bonding holes and a plurality of second bonding holes. At least a portion of the first adhesive component can be connected to each other on the inner surface of the main body housing through at least a portion of the first bonding holes. At least a portion of the second adhesive component can be connected to each other on the inner surface of the main body housing through at least a portion of the second bonding holes.

[0027] The first adhesive component and the second adhesive component may comprise polymers from the polyolefin series.

[0028] Additionally, the method for manufacturing a battery cell according to this disclosure may include the following steps: receiving an electrode assembly through an opening in the interior of a main body housing; applying an adhesive component to a bonding region disposed adjacent to the opening along at least a portion of the periphery of the opening in a region of the main body housing; bonding a cover portion bonded to the bonding region and covering the opening to the main body housing; and heating or pressurizing the bonding region such that the adhesive component is located on the outer side and inner side of the main body housing through a bonding hole penetrating the main body housing in the bonding region.

[0029] The effects of the invention

[0030] First, according to one embodiment of this disclosure, the manufacturability of battery cells can be improved by improving the manufacturing process of the battery cells.

[0031] Secondly, according to another embodiment of this disclosure, the stability and lifespan of the battery cell can be improved.

[0032] Third, according to another embodiment of this disclosure, a battery cell and its manufacturing method can be provided that can replace welding in the manufacturing process of the battery cell while ensuring the sealing of the can (outer shell or main shell) and the cap (cap assembly or cover).

[0033] Fourth, according to yet another embodiment of this disclosure, the bonding force between the can (outer shell or main shell) and the cap (cap assembly or cover) can be increased. Attached Figure Description

[0034] Figure 1 This is one example of a battery cell based on this disclosure;

[0035] Figure 2 This is an exploded view of an example of a battery cell according to this disclosure;

[0036] Figure 3 (a) shows the coating applied before the cover is joined to the main body shell. Figure 2 A diagram showing the distribution of adhesive in region A; Figure 3 (b) is shown Figure 2A diagram showing the distribution of adhesive applied to area A when the cover is joined to the main body shell;

[0037] Figure 4 (a) shows a cross-section of region A, indicating the coating applied to the cover before it is joined to the main body shell. Figure 2 A diagram showing the distribution of adhesive in region A; Figure 4 (b) is shown on a cross section of region A. Figure 2 A diagram showing the distribution of adhesive when the cover is bonded to the main body shell;

[0038] Figure 5 (a) to Figure 5 (c) is a diagram showing another example of a battery cell according to this disclosure;

[0039] Figure 6 This is a flowchart illustrating a method for manufacturing a battery cell according to the present disclosure.

[0040] Explanation of reference numerals in the attached figures

[0041] 10: Battery Cell

[0042] 13: Main body shell

[0043] 131b: Inner side of the main body shell

[0044] 137: Combining regions

[0045] 16: Connecting hole

[0046] 14: cover

[0047] 150: Electrode assembly

[0048] 17: Opening

[0049] 171: First opening

[0050] 172: Second opening

[0051] 18: Accommodation space

[0052] 30: Adhesive components Detailed Implementation

[0053] The preferred embodiments according to this disclosure are described in detail below with reference to the accompanying drawings. The construction of the apparatus or the control method described below are for illustrative purposes only and are not intended to limit the scope of the claims according to this disclosure, and the same reference numerals used throughout the specification denote the same constituent elements.

[0054] Figure 1 This is an example of a battery cell according to this disclosure.

[0055] According to this disclosure, cell 10 refers to a secondary battery that can be reused by charging and discharging electrical energy. As an example, it can be a lithium secondary battery, but is not limited to this.

[0056] According to this disclosure, the battery cell 10 can be classified into pouch-type secondary batteries, prismatic secondary batteries, or cylindrical secondary batteries based on its shape. (See also...) Figure 1 In this specification, for ease of explanation, a square secondary battery is shown as an example, but it is not limited to this. That is, it can be used regardless of the shape of the cell 10, as long as there is a part that can be sealed instead of welding.

[0057] Reference Figure 1 According to this disclosure, the battery cell 10 may include: an electrode assembly 150 (see reference 150). Figure 2 The electrode assembly 150 includes a positive electrode, a negative electrode, and a separator; and a housing 12 that internally houses the electrode assembly 150.

[0058] The outer casing 12 may include: a main outer casing 13, having an opening 17 with one side open (see reference). Figure 2 ); and a cover 14, which is attached to the main body shell 13 to cover the opening 17. Unlike a conventional cover which is planar and attached to the opening 17 and welded to the main body shell 13, the cover 14 can be attached to a region of the main body shell 13 around the opening 17 and close the opening 17.

[0059] The housing 12 can internally house the electrode assembly 150. The housing 12 can internally house the electrode assembly and the electrolyte. The housing 12 can be formed of a metallic material. For example, the housing 12 can be formed of a composite layer, and any one of the layers can be formed of aluminum.

[0060] That is, the outer casing 12 may contain a material with high mechanical rigidity to protect the battery cell 10 from external impacts.

[0061] The cover 14 can surround a portion of the main body shell 13 and cover the opening 17.

[0062] A conventional cover can be machined to match the dimensions of the opening 17 and joined by welding. However, if the dimensions of the conventional cover are incorrectly machined, resulting in a mismatch with the opening 17 and a gap, the opening 17 cannot be completely sealed. Furthermore, if foreign objects enter the interior of the housing 12 during the welding process, the performance of the electrode assembly 150 may also be reduced.

[0063] According to this disclosure, the battery cell 10 may include a cover 14 that surrounds at least a portion of the main housing 13. Furthermore, in order to avoid the use of welding but instead utilize adhesive components (or adhesives, see...) Figure 3 (a))30, which combines the cover 14 with the main housing 13 while maintaining a sealing force, may include a connecting hole 16 (see reference). Figure 2 This allows the adhesive component 30 to penetrate into the inner surface of the main body housing 13.

[0064] Figure 2 This is an exploded view of an example of a battery cell according to this disclosure.

[0065] Reference Figure 2 According to this disclosure, the battery cell 10 may include: an electrode assembly 150; a main housing 13 having an opening 17 on one side, through which the electrode assembly 150 is received; a bonding region 137 disposed adjacent to at least a portion of the opening 17 along the periphery of the opening 17 in a region of the main housing 13; a bonding hole 16 penetrating the main housing 13 in the bonding region 137; and a cover 14 including a terminal portion 11 for electrically connecting the electrode assembly 150 to the outside (see reference). Figure 1 ), and in the bonding region 137, it is bonded to the main body shell 13 to cover the opening 17.

[0066] Furthermore, the battery cell 10 may also include an adhesive component 30, which is located on the inner side 131b of the main body housing in the bonding area 137 via the bonding hole 16 (see reference). Figure 4 (a) and the outer surface 131a of the main body shell (refer to) Figure 4 (a) and cured to combine the cover 14 and the main body shell 13.

[0067] The electrode assembly 150 may include a positive electrode 151, a negative electrode 153, and a separator 152 for separating the positive electrode 151 and the negative electrode 153 from each other. The electrode assembly 150 can be classified into stacking, winding, stack-folding, and Z-stacking types depending on the stacking method of the positive electrode 151, the negative electrode 153, and the separator 152. The type of electrode assembly 150 included in the cell 10 according to this disclosure is not limited. That is, the cell 10 according to this disclosure may include an electrode assembly 150 manufactured in any of the stacking, winding, stack-folding, and Z-stacking methods.

[0068] The battery cell 10 may include a positive current collector (not shown) connected to the stacked positive electrode 151 to allow current flow, and a negative current collector (not shown) connected to the stacked negative electrode 153 to allow current flow. The positive and negative current collectors may contain known conductive materials within a range that will not cause a chemical reaction in the lithium-ion battery. For example, the current collector may contain any of stainless steel, nickel (Ni), aluminum (Al), titanium (Ti), copper (Cu), and alloys thereof, and may be provided in various forms such as film, sheet, or foil.

[0069] The positive current collector and the negative current collector can be electrically connected to the electrode assembly 150 via the terminal portion 11.

[0070] In addition, the positive electrode 151 and the negative electrode 153 may contain active materials. The positive electrode 151 may contain a positive active material, and the negative electrode 153 may contain a negative active material. The positive active material may be a substance in which lithium ions can be inserted and extracted, and the negative active material may be a substance in which lithium ions can be adsorbed and desorbed.

[0071] For example, the positive electrode active material can be lithium metal oxide, and the negative electrode active material can be any one of crystalline carbon, amorphous carbon, carbon composites, carbon fibers, lithium alloys, silicon (Si), and tin (Sn).

[0072] Furthermore, the positive electrode 151 and the negative electrode 153 may further include an adhesive (not shown) and a conductive material (not shown) to improve mechanical stability and conductivity.

[0073] The separator 152 can be configured to prevent electrical short circuits between the positive electrode 151 and the negative electrode 153 and to allow the flow of ions. The type of separator is not particularly limited, but may include porous polymer membranes (membranes or thin films). For example, the separator 152 may include a porous polymer membrane or a porous nonwoven fabric.

[0074] Additionally, the battery cell 10 may contain an electrolyte to impregnate the electrode assembly 150 located inside the casing 12. The electrolyte may be a non-aqueous electrolyte. The electrolyte may contain lithium salts and organic solvents. The electrolyte may also contain additives. These additives may form a film on the positive or negative electrode through a chemical reaction inside the battery. For example, a positive electrode interface film may be formed on the positive electrode 151, and a negative electrode interface film may be formed on the negative electrode 153.

[0075] Reference Figure 2The main housing 13 has an opening 17 on one side, through which the electrode assembly 150 can be accommodated. That is, the main housing 13 can form an accommodating space 18 inside for accommodating the electrode assembly 150.

[0076] In addition, the main body shell 13 may include: a bonding region 137 (see reference 137). Figure 3 A connecting hole 137 is disposed adjacent to the opening 17 in at least a portion around the opening 17 in a region of the main housing 13; and a connecting hole 16 penetrates the main housing 13 in the connecting region 137.

[0077] The cover 14 can be joined with the joining area 137 and close the opening 17. Since the cover 14 is joined to the main body shell 13 using adhesive rather than conventional welding, at least a portion of the cover 14 and the main body shell 13 are joined in a non-linear joining area 137 with a certain area, thereby ensuring a sealing force and bonding force comparable to welding.

[0078] Furthermore, when the cover 14 is attached to the attachment area 137, the adhesive component 30 can move through the attachment hole 16 to the inner side 131b of the main body shell and be cured, thereby enhancing the sealing force and bonding force between the cover 14 and the main body shell 13.

[0079] The cover portion 14 may include a terminal portion 11 for electrically connecting the electrode assembly 150 to the outside (see reference). Figure 1 This allows for electrical connection between the electrode assembly 150 and the outside.

[0080] The connecting hole 16 can be connected to the connecting area 137 via the cover side 14b to avoid being exposed to the outside.

[0081] The connecting hole 16 can be formed by penetrating the main body housing 13 along the periphery of the opening 17 in the connecting region 137. Furthermore, multiple connecting holes 16 may be provided. These multiple connecting holes 16 can be configured in the connecting region 137 to penetrate the main body housing 13 at predetermined intervals.

[0082] If the length of one side of the main housing 13 varies along the periphery of the opening 17, the spacing can also vary. (Refer to...) Figure 2 The spacing of the plurality of connecting holes 16 arranged along the long edge around the opening 17 may be different from the spacing of the plurality of connecting holes 16 arranged along the short edge around the opening 17.

[0083] Additionally, the cover 14 may include: a cover-facing surface 14a, which is opposite to the opening 17; and a cover-side surface 14b, which curves and extends from each corner of the cover-facing surface 14a toward the main body housing 13.

[0084] Therefore, when the cover side 14b is engaged with the engagement area 137, the engagement hole 16 exposed to the outside can be prevented from being visually exposed to the user or operator.

[0085] That is, the connecting hole 16 can be covered by the cover 14 in the final product form, so that it will not be visually exposed to the outside.

[0086] Since the cover 14 surrounds the joining region 137 around the opening 17, the cross-sectional area of ​​the cover 14 can be larger than the cross-sectional area of ​​the main body shell 13.

[0087] Additionally, refer to Figure 2 According to this disclosure, the battery cell 10 may include: an electrode assembly 150; a main housing 13 for accommodating the electrode assembly; a first opening 171 formed on one side of the main housing 13; a second opening 172 formed on the other side of the main housing 13 opposite to the first side; and a first bonding region 1371 (see reference). Figure 3 (a) is disposed adjacent to the first opening 171 along at least a portion of the periphery of the first opening 171 in one region of the main body housing 13; a second coupling region (not shown) is disposed adjacent to the second opening 172 along at least a portion of the periphery of the second opening 172 in another region of the main body housing 13; a first coupling hole 161 penetrates the main body housing 13 in the first coupling region 1371; a second coupling hole 162 penetrates the main body housing 13 in the second coupling region (not shown); a first cover 141 is coupled to the first coupling region 1371 to cover the first opening 171; and a second cover 142 is coupled to the second coupling region to cover the second opening 172.

[0088] The battery cell 10 may further include: a first adhesive component 301 (see reference) Figure 3(a) The first cap 141 and the main body shell 13 are bonded together by the first bonding hole 161 located on the inner side 131b and the outer side 131a of the main body shell in the first bonding area 1371; and the second adhesive member (not shown) is bonded together by the second bonding hole 162 located on the inner side 131b and the outer side 131a of the main body shell in the second bonding area.

[0089] Although the second adhesive component and the second bonding area are not shown in the accompanying drawings, it will be obvious to those skilled in the art that the second adhesive component and the second bonding area are adjacent to the second opening 172, similar to how the first adhesive component 301 and the first bonding area 1371 are adjacent to the first opening 171.

[0090] The opening 17 may include: a first opening 171 formed on one side of the main body housing 13; and a second opening 172 formed on the other side of the main body housing 13 opposite to the first side. This is to ensure that the terminals 11 of each polarity face opposite directions to each other.

[0091] The bonding region 137 may include: a first bonding region 1371, which is disposed adjacent to the first opening 171 along at least a portion of the periphery of the first opening 171 in one region of the main body housing 13; and a second bonding region, which is disposed adjacent to the second opening 172 along at least a portion of the periphery of the second opening 172 in another region of the main body housing 13.

[0092] The connecting hole 16 may include: a first connecting hole 161, which penetrates the main body shell 13 in the first connecting region 1371; and a second connecting hole 162, which penetrates the main body shell 13 in the first connecting region 1371.

[0093] The cover 14 may include: a first cover 141, which is attached to the first attachment region 1371 to cover the first opening 171; and a second cover 142, which is attached to the second attachment region to cover the second opening 172.

[0094] The adhesive component 30 may include: a first adhesive component 301, which is located on the inner side 131b and the outer side 131a of the main body shell in the first bonding area 1371 through the first bonding hole 161 and is cured to bond the first cover 141 and the main body shell 13; and a second adhesive component, which is located on the inner side 131b and the outer side 131a of the main body shell in the second bonding area through the second bonding hole 162 and is cured to bond the second cover 142 and the main body shell 13.

[0095] The first adhesive component 301 is provided with a plurality of first bonding holes 161 and a plurality of second bonding holes 162. At least a portion of the first adhesive component 301 can be connected to each other on the inner surface 131b of the main body shell through at least a portion of the plurality of first bonding holes 161. At least a portion of the second adhesive component can be connected to each other on the inner surface 131b of the main body shell through at least a portion of the plurality of second bonding holes 162.

[0096] The first adhesive component 301 and the second adhesive component may comprise polymers from the polyolefin family.

[0097] Unless otherwise specified, the description of one opening in this specification is equally applicable to another opening.

[0098] Figure 3 (a) shows the coating applied before the cover is joined to the main body shell. Figure 2 A diagram showing the distribution of adhesive in region A. Figure 3 (b) is shown Figure 2 A diagram showing the distribution of adhesive applied to area A when the cover is joined to the main body shell.

[0099] Reference Figure 3 (a) The battery cell 10 may further include an adhesive component 30, which passes through the bonding hole 16 in the bonding area 137 located on the inner side 131b of the main body housing and the outer side 131a of the main body housing (see reference). Figure 4 (a) and cured to combine the cover 14 and the main body shell 13.

[0100] The adhesive component 30 may be applied (or sprayed) to the bonding area 137 before the main housing 13 is bonded to the cover 14. The adhesive component 30 may be applied in a viscous liquid state and then cured by pressure and / or heat at a preset bonding temperature and / or preset bonding pressure after the cover 14 is bonded.

[0101] The adhesive component 30 may comprise a polyolefin polymer. The adhesive component 30 is a hot-melt adhesive; however, other polymer series may also be used, provided that the substance does not undergo side reactions upon contact with the electrolyte.

[0102] For example, the adhesive component 30 can be a polymer from the polyolefin family, such as polyethylene or polypropylene. Alternatively, the adhesive component 30 can also comprise a polymer from the polyurethane family.

[0103] [Table 1]

[0104]

[0105] Table 1 summarizes the results of the deformation of the main body shell 13 and the cover 14, as well as the sealing force of the adhesive member 30, under various pressure and temperature conditions applied to the bonding area 137 or the main body shell 13 and the cover 14.

[0106] Referring to Table 1, it can be seen that the embodiment conducted under conditions of 140 MPa and 160 °C is superior to the other comparative examples in terms of deformation and sealing force. However, the adhesive component 30 can vary depending on the thickness of the cover 14 and the main housing 13, and the content of the adhesive component in the adhesive component 30; therefore, the adhesive pressure and the adhesive temperature are not limited to 140 MPa and 160 °C.

[0107] Reference Figure 3 (a) In manufacturing the battery cell 10, the adhesive component 30 may be coated on the outer surface 131a of the main housing in the bonding region 137. Figure 3 (a) is a view of any side of the main body housing 13 as seen from the inner side 131b. Therefore, the adhesive member 30 is currently... Figure 3 (a) is an example of a coating applied to the rear side of the main body shell.

[0108] Figure 3 (b) shows an example in which, after the cover 14 is attached to the main body housing 13, during the process of pressurization and / or heating at the adhesive temperature and / or the adhesive pressure, the adhesive component 30 is pressed into the inner surface 131b of the main body housing through the attachment hole 16 and cured.

[0109] Reference Figure 3(b) may have a plurality of said coupling holes 16, and at least a portion of the adhesive member 30 may be connected to each other on the inner surface 131b of the main body housing through at least a portion of the plurality of coupling holes 16. Therefore, the sealing force and bonding force can be improved compared to the case where the adhesive member 30 is separated on the inner surface 131b of the main body housing between each of the coupling holes 16.

[0110] That is, at least a portion of the adhesive component 30 can be moved from the outer side 131a of the main body shell to the inner side 131b of the main body shell through the bonding hole 16 before curing. Therefore, the adhesive component 30 may include an adhesive component 30b cured in the bonding hole 16, an adhesive component 30a cured on the outer side 131a of the main body shell, and an adhesive component 30c cured on the inner side 131b of the main body shell.

[0111] Additionally, refer to Figure 3 (a) and Figure 3 (b) In order to describe the adhesive component 30, this specification only uses one side of the main body shell 13 in the bonding region 137 and the bonding hole 16 located on that side for explanation, but this also applies to bonding holes 16 in other locations and the adhesive component 30. That is, the adhesive component 30 can be coated on the outer surface 131a of the main body shell to surround the opening 17 (see reference). Figure 2 ).

[0112] in addition, Figure 3 (a) and Figure 3 (b) only shows the connection between the joint region 137 and the first opening 171 (see reference). Figure 2 The first bonding region 1371 is adjacent to the second opening (172, see reference). Figure 2 The same method can also be applied to the adjacent second bonding area (not shown). Figure 3 (a) and Figure 3 (b) describes the morphology, structure, or function of the first bonding region 1371.

[0113] Figure 4 (a) shows a cross-section of region A, indicating the coating applied to the cover before it is joined to the main body shell. Figure 2 A diagram showing the distribution of adhesive in region A. Figure 4 (b) is shown on a cross section of region A. Figure 2 A diagram showing the distribution of adhesive when the cover is bonded to the main body shell.

[0114] Reference Figure 4 (a) and Figure 4(b) The adhesive component 30 may be located on the outer surface 131a of the main housing before curing. Subsequently, the adhesive component 30 can be bonded to the cover 14 and the main housing 13 by heating and pressurizing at a preset adhesive temperature and adhesive pressure. Furthermore, the adhesive components 30 may be moved through the bonding hole 16 to the inner surface 131b of the main housing to be bonded and cured together under the adhesive temperature and / or the adhesive pressure.

[0115] Therefore, the cured adhesive component 30 can be distributed in the bonding region 137 on the outer surface 131a of the main body shell, the inner surface 131b of the main body shell, and the bonding hole 16. That is, at least a portion of the adhesive component 30 can be located in the bonding hole 16.

[0116] Reference Figure 4 (a) and Figure 4 (b) In order to describe the adhesive component 30, this specification only uses one side of the main body shell 13 in the bonding region 137 and the bonding hole 16 located on that side for explanation, but this also applies to bonding holes 16 in other locations and the adhesive component 30. That is, the adhesive component 30 can be coated on the outer surface 131a of the main body shell to surround the opening 17 (see reference). Figure 2 ).

[0117] Figure 5 (a) to Figure 5 (c) is a diagram showing another example of a battery cell according to this disclosure.

[0118] Figure 5 (a) shows an example of the cover 14 surrounding the main body shell 13 and covering the opening 17.

[0119] Reference Figure 5 (a) is in relation to the opening 17 (refer to) Figure 2 In the parallel direction, the cross-sectional area of ​​the cover 14 can be greater than or equal to the cross-sectional area of ​​the main body shell 13.

[0120] More specifically, when the cover 14 is engaged with the engagement region 137, the cover side surface 14b may form a step with the outer side surface 131a of the main body shell located outside the engagement region 137. That is, when the cover 14 is engaged with the engagement region 137, the cover side surface 14b may protrude outwards from the outer side surface 131a of the main body shell located outside the engagement region 137.

[0121] Although not shown separately, refer to Figure 5In (a), in a direction parallel to the opening 17, one cross-sectional area of ​​the main body shell 13 in the joining region 137 is smaller than another cross-sectional area of ​​the main body shell 13 located outside the joining region 137 and one cross-sectional area of ​​the cover 14, so that when the cover 14 is joined to the joining region 137, the cover side 14b can form a step with the outer side 131a of the main body shell located outside the joining region 137.

[0122] That is, since one cross-sectional area of ​​the cover 14 is larger than one cross-sectional area of ​​the main body shell 13 in the joint region 137, but smaller than another cross-sectional area of ​​the main body shell 13 located outside the joint region 137, therefore it is compatible with... Figure 5 Unlike (a), the cover side 14b can form a step further inward than the main body shell 13.

[0123] Figure 5 (b) shows another example of the cover 14 surrounding the main body shell 13 and covering the opening 17.

[0124] Reference Figure 5 (b) In a direction parallel to the opening 17, one cross-sectional area of ​​the main body shell 13 in the joining region 137 is smaller than another cross-sectional area of ​​the main body shell 13 located outside the joining region 137, and is the same as one cross-sectional area of ​​the cover 14. Therefore, when the cover 14 is joined to the joining region 137, the cover side 14b can form a coplanar surface with the outer side 131a of the main body shell located outside the joining region 137.

[0125] and Figure 5 Unlike (a), the size of the electrode assembly 150 accommodated through the opening 17 may be reduced due to the reduced area of ​​the opening. However, the outer side 131a of the main housing and the cover side 14b can form a smooth surface, so space can be effectively utilized when stacking the cells 10.

[0126] Figure 5 (c) shows another example of the cover 14 surrounding the main body shell 13 and covering the opening 17.

[0127] The Figure 5 (c) is with Figure 5This is an example similar to (a), but with a different roughness in the bonding region. That is, the roughness of the outer surface 131a of the main body shell in the bonding region 137 may be different from the roughness of the outer surface 131a of the main body shell located outside the bonding region 137.

[0128] More specifically, the roughness of the outer surface 131a of the main body shell in the bonding region 137 can be greater than the roughness of the outer surface 131a of the main body shell located outside the bonding region 137. This is to ensure compatibility with... Figure 5 Compared to embodiment (a), the bonding force and sealing force of the adhesive component 30 are improved.

[0129] Figure 6 This is a flowchart illustrating a method for manufacturing a battery cell according to the present disclosure.

[0130] The method of manufacturing the battery cell 10 according to this disclosure may include: step S10, receiving an electrode assembly 150 through the opening 17 into the interior of a main body housing 13 having an opening 17 on one side; step S30, applying an adhesive component 30 to a bonding region 137 disposed adjacent to the opening 17 along at least a portion of the periphery of the opening 17 in a region of the main body housing 13; step S50, bonding a cover 14 to the bonding region 137 covering the opening 17 to the main body housing 13; and step S70, heating or pressurizing the bonding region 137 such that the adhesive component 30 is located on the outer side 131a and the inner side 131b of the main body housing through a bonding hole 16 formed by penetrating the main body housing 13 in the bonding region 137.

[0131] As described above, in step S10, which accommodates the electrode assembly 150, the electrode assembly 150 can be disposed in the accommodating space 18 through the opening 17 according to the manufacturing method of the cell 10 of this disclosure.

[0132] Subsequently, according to the manufacturing method of the battery cell 10 of this disclosure, step S30, which involves coating the adhesive component 30 onto the bonding region 137, can be performed. The bonding hole 16 is provided on the main body housing 13 rather than the cover portion 14 so that the adhesive component 30 can also be moved to the inner surface 131b of the main body housing through the subsequent step S70 of heating or pressurizing the bonding region 137 to improve the sealing force and bonding force.

[0133] The manufacturing method of the battery cell 10 according to this disclosure may further include a step S90 of injecting electrolyte into the receiving space 18 after step S70 of heating or pressurizing the bonding region 137. Since the cover 14 and the main housing 13 are sealed by the adhesive member 30, the electrolyte can be injected into the receiving space 18 according to the manufacturing method of the battery cell 10 according to this disclosure.

[0134] This disclosure can be implemented in various modified forms, and its scope is not limited to the embodiments described above. Therefore, if modified embodiments include elements of the claims of this disclosure, they should be considered to fall within the scope of this disclosure.

Claims

1. A battery cell comprising: Electrode assembly; The main body housing has an opening on one side, through which the electrode assembly is housed inside the main body housing; The joining region is disposed adjacent to the opening in at least a portion around the opening in a region of the main housing; A connecting hole penetrates the main body housing in the connecting region; The cover includes a terminal portion that electrically connects the electrode assembly to the outside, and is coupled to the main housing in the coupling region to cover the opening; as well as An adhesive component, located on the inner and outer sides of the main body housing in the bonding area through the bonding hole, is cured to bond the cover and the main body housing.

2. The battery cell according to claim 1, wherein, At least a portion of the adhesive component is located in the bonding hole.

3. The battery cell according to claim 1 or 2, wherein, It has multiple of the aforementioned connecting holes, At least a portion of the adhesive components are connected to each other on the inner surface of the main body housing through at least a portion of the multiple bonding holes.

4. The battery cell according to claim 1 or 2, wherein, The adhesive component combines the cover and the main body shell by heating and pressurizing at a preset adhesive temperature and adhesive pressure.

5. The battery cell according to claim 1 or 2, wherein, In a direction parallel to the opening, one cross-sectional area of ​​the cover is greater than one cross-sectional area of ​​the main body shell.

6. The battery cell according to claim 1 or 2, wherein, The roughness of the outer surface of the main body shell in the bonding region is different from the roughness of the outer surface of the main body shell located outside the bonding region.

7. The battery cell according to claim 6, wherein, The roughness of the outer surface of the main body shell in the bonding region is greater than the roughness of the outer surface of the main body shell located outside the bonding region.

8. The battery cell according to claim 1 or 2, wherein, The cover includes: The opposite side of the cover is opposite to the opening; and The sides of the cover curve and extend from the corners of the opposite side of the cover toward the main body shell. When the side of the cover is attached to the attachment area, it prevents the attachment hole from being exposed to the outside.

9. The battery cell according to claim 8, wherein, When the cover is attached to the attachment area, the side of the cover forms a step with the outer side of the main body shell located outside the attachment area.

10. The battery cell according to claim 8, wherein, When the cover is attached to the attachment area, the side of the cover protrudes outward from the outer side of the main body shell located outside the attachment area.

11. The battery cell according to claim 8, wherein, In the joining region, one cross-sectional area of ​​the main outer shell is smaller than another cross-sectional area of ​​the main outer shell located outside the joining region in a direction parallel to the opening, but the same as one cross-sectional area of ​​the cover. When the cover is attached to the attachment area, the side surface of the cover is coplanar with the outer surface of the main body shell located outside the attachment area.

12. The battery cell according to claim 8, wherein, In the joining region, one cross-sectional area of ​​the main body shell is smaller than the other cross-sectional area of ​​the main body shell located outside the joining region in a direction parallel to the opening, and one cross-sectional area of ​​the cover. When the cover is attached to the attachment area, the side of the cover forms a step with the outer side of the main body shell located outside the attachment area.

13. The battery cell according to claim 1 or 2, wherein: The opening includes: A first opening is formed on one side of the main body shell; and The second opening is formed on the other side of the main body shell, opposite to the first side of the main body shell. The bonding region includes: A first bonding region is disposed adjacent to the first opening in at least a portion of the periphery of the first opening in a region of the main housing; and A second bonding region is disposed adjacent to the second opening in at least a portion around the second opening in another region of the main housing. The connecting hole includes: A first mating hole penetrates the main body shell in the first mating region; and The second connecting hole penetrates the main body shell in the second connecting region. The cover includes: A first cover portion, which is attached to the first engagement area to cover the first opening; and The second cover is attached to the second joining area and covers the second opening.

14. The battery cell according to claim 13, wherein, The adhesive component further includes: A first adhesive component, through the first bonding hole, is located on the inner side and outer side of the main body shell in the first bonding area and is cured to bond the first cover and the main body shell; and The second adhesive component is located on the inner side and outer side of the main body shell in the second bonding area through the second bonding hole and is cured to bond the second cover and the main body shell.

15. The battery cell according to claim 14, wherein, There are multiple first connecting holes and multiple second connecting holes. At least a portion of the first adhesive component is connected to each other on the inner surface of the main body housing through at least a portion of the first coupling holes. At least a portion of the second adhesive component is connected to each other on the inner surface of the main body housing through at least a portion of the second bonding holes.

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