Battery cell and battery cell shell manufacturing method

Abstract

The battery cell of the present disclosure may comprise: a case main body accommodating an electrode assembly; a case cover covering at least one surface of the opening of the case main body; and an exhaust cutout portion formed in a recessed manner on at least one of one surface of the case main body and one surface of the case cover, the exhaust cutout portion may include: a linear portion having a linear pattern; and a curved portion connected to the straight portion and having a curved pattern, the width of the straight portion being different from the width of the curved portion.

Description

Technical Field

[0001] The present disclosure relates to a battery cell and a method for manufacturing a battery cell shell. Background Art

[0002] In recent years, research on battery cells has been actively conducted. Battery cells can convert electrical energy into chemical energy and store it for repeated use through charging and discharging. Due to their economical and environmentally friendly characteristics, battery cells are widely used in various industries.

[0003] On the other hand, repeated charging and discharging of battery cells increases internal pressure and may cause swelling, which generates a large amount of heat. This swelling can cause explosions or fires, so a solution is needed to regulate the internal pressure of the battery cells. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] According to one aspect of the present disclosure, a battery cell having improved stability by adjusting internal pressure may be provided.

[0006] According to another aspect of the present disclosure, a battery cell including a venting notch portion having a uniform depth may be provided.

[0007] According to yet another aspect of the present disclosure, a method for manufacturing a battery cell case can be provided, which improves production efficiency by manufacturing a venting notch portion and the case integrally.

[0008] On the other hand, the present disclosure can be widely applied to electric vehicles, battery charging stations, energy storage systems (ESS), and other green technology fields such as solar power generation and wind power generation that utilize batteries.

[0009] In addition, the present disclosure can be applied to eco-friendly mobility, including electric vehicles and hybrid vehicles, which prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0010] (2) Technical solution

[0011] In order to solve the above technical problems, the battery cell according to the present disclosure may include: a shell body, accommodating an electrode assembly; a shell cover, covering at least one side of the opening of the shell body; and an exhaust notch portion, which is recessed on at least one side of the shell body and the shell cover. The exhaust notch portion may include: a straight line portion, having a straight line pattern; and a curved line portion, connected to the straight line portion and having a curved line pattern. The width of the straight line portion may be different from the width of the curved line portion.

[0012] According to one embodiment, on a surface of the housing body or a surface of the housing cover where the exhaust notch is formed, the width of the straight portion may be smaller than the width of the curved portion.

[0013] According to one embodiment, the depth of the straight portion may be the same as the depth of the curved portion.

[0014] According to one embodiment, the exhaust notch portion may further include a solidified region, wherein the solidified region forms a surface of the straight portion and a surface of the curved portion.

[0015] According to one embodiment, the color of the coagulation region may be different from the color of at least one of the one surface of the housing body and the one surface of the housing cover other than the surface of the straight portion and the surface of the curved portion.

[0016] According to one embodiment, the exhaust notch portion may further include a connecting portion provided between the straight portion and the curved portion to connect the straight portion and the curved portion, and a width of the connecting portion may be different from a width of the straight portion and a width of the curved portion.

[0017] According to one embodiment, the ten-point average roughness of the surface of the exhaust notch portion may be higher than the ten-point average roughness of at least one of the one surface of the housing body and the one surface of the housing cover.

[0018] According to one embodiment, the exhaust notch portion may further include: a bottom portion forming a bottom surface of at least one of the straight portion and the curved portion; and grooves recessed deeper than the bottom portion on both sides of the bottom portion.

[0019] According to one embodiment, the exhaust notch portion may further include a groove that is recessed from an outer surface of at least one of one surface of the housing body and one surface of the housing cover toward the inside.

[0020] According to one embodiment, a surface of the housing body or a surface of the housing cover defining the groove may include a plurality of grains, and the plurality of grains may form an equiaxed structure.

[0021] According to one embodiment, the exhaust notch portion may be provided on an outer surface of a side of the housing body facing the housing cover.

[0022] In order to solve the above technical problems, according to the battery cell shell manufacturing method disclosed in the present invention, the battery cell includes: a shell body, which accommodates the electrode assembly; and a shell cover, which covers at least one side of the opening of the shell body. The battery cell shell manufacturing method may include: forming an exhaust notch portion on one side of the battery cell shell, and the exhaust notch portion includes: a straight line portion, which has a straight line pattern; and a curved line portion, which is connected to the straight line portion and has a curved line pattern. The width of the straight line portion may be smaller than the width of the curved line portion, and the depth of the straight line portion and the depth of the curved line portion may be the same.

[0023] According to one embodiment, forming the exhaust notch may include: etching one side of the cell case using a laser along a first direction in which the straight line pattern extends and a second direction perpendicular to the first direction.

[0024] According to one embodiment, in the first direction, a period at which the laser intersects the straight line pattern may be greater than a period at which the laser intersects the curved line pattern.

[0025] According to one embodiment, the method may further include: before forming the exhaust notch, performing a heat treatment on a portion of one side of the battery cell case where the exhaust notch is to be formed.

[0026] (3) Beneficial effects

[0027] According to an embodiment of the present disclosure, stability can be improved by adjusting the internal pressure of the battery cell.

[0028] According to the embodiments of the present disclosure, the production efficiency of battery cells can be improved.

[0029] According to the embodiment of the present disclosure, production efficiency can be improved by manufacturing the exhaust notch portion and the housing integrally. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a diagram for explaining a battery cell according to one embodiment.

[0031] Figure 2 Is used to illustrate Figure 1 Figure 1 shows the exhaust notch section.

[0032] Figure 3 It is along Figure 2 Cross-sectional view taken along line AA and line BB.

[0033] Figure 4 It is a diagram for explaining an exhaust notch portion and a housing according to one embodiment.

[0034] Figure 5 It is a diagram for explaining an exhaust notch portion and a housing according to another embodiment.

[0035] Figure 6 It is a diagram for explaining a gas exhaust notch according to still another embodiment.

[0036] Figure 7 It is a diagram for explaining a gas exhaust notch according to still another embodiment.

[0037] Figure 8 1 is a diagram for explaining a method of manufacturing a vent notch according to one embodiment.

[0038] Figure 9 is a diagram for explaining a battery cell according to another embodiment.

[0039] Description of reference numerals:

[0040] 100: Battery Cell

[0041] 110: Shell body

[0042] 130: Housing cover

[0043] 150: Exhaust notch

[0044] 151: Straight line

[0045] 152: Curve

[0046] 153: Connection

[0047] W151: First width

[0048] W152: Second width

[0049] W153: Third width

[0050] D151: First Depth

[0051] D152: Second Depth

[0052] LP: Laser Pattern

[0053] 155: Solidification area

[0054] 150a: bottom

[0055] 150b: Grooves DETAILED DESCRIPTION

[0056] The structural or functional descriptions of the embodiments disclosed in this specification or application are merely illustrative for illustrating the embodiments of the technical ideas according to the present invention. In addition to the embodiments disclosed in this specification or application, the embodiments of the technical ideas according to the present invention can also be implemented in various forms. The technical ideas of the present invention should not be interpreted as being limited to the embodiments described in this specification or application.

[0057] Figure 1 is a diagram for explaining a battery cell according to one embodiment.

[0058] Reference Figure 1 The battery cell 100 according to one embodiment of the present invention may include a case including a case body 110 and a case cover 130 .

[0059] The housing body 110 and the housing cover 130 may form an interior space for accommodating the electrode assembly. The housing body 110 may include a conductive metal such as aluminum, an aluminum alloy, or nickel-plated steel. The housing body 110 may have a hexahedral shape and include an opening into which the electrode assembly may be inserted. However, the embodiment is not limited thereto, and the shape of the housing body 110 may be variously modified according to the embodiment.

[0060] The case cover 130 may be coupled to the case body 110. The case cover 130 may be disposed at an opening of the case body 110. The case cover 130 may close the opening of the case body 110. The case cover 130 may cover the opening of the case body 110 to form an inner space for accommodating the electrode assembly. The case cover 130 may include an injection hole 133.

[0061] The electrode assembly may be disposed in the interior space of the housing body 110. The electrode assembly may include a positive electrode, a separator, and a negative electrode. The electrode assembly may be constructed in various forms such as a stacked type or a wound type as needed.

[0062] The positive electrode may include a positive electrode current collector. The negative electrode may include a negative electrode current collector. The current collector may include a known conductive material within a range that does not cause a chemical reaction within the lithium secondary battery. For example, the current collector may include 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.

[0063] The positive electrode and negative electrode may contain active materials. The positive electrode may contain a positive electrode active material, and the negative electrode may contain a negative electrode active material. The positive electrode active material may be a substance that allows lithium ions to be intercalated and deintercalated, while the negative electrode active material may be a substance that allows lithium ions to be adsorbed and deintercalated. For example, the positive electrode active material may be a lithium metal oxide, and the negative electrode active material may be any of carbon-based materials such as crystalline carbon, amorphous carbon, carbon composites, carbon fibers, lithium alloys, silicon (Si), and tin (Sn).

[0064] In addition, the positive electrode and the negative electrode may further comprise a binder and a conductive material, respectively, to improve mechanical stability and electrical conductivity.

[0065] The separator can prevent electrical short circuits between the positive and negative electrodes and allow ion flow. The type of separator is not particularly limited, but may include a porous polymer film. For example, the separator may include a porous polymer film or a porous non-woven fabric. As another example, the separator may be composed of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene.

[0066] The electrolyte may include an electrolyte solution. The electrolyte solution may be a non-aqueous electrolyte solution. The electrolyte solution may contain a lithium salt and an organic solvent. The electrolyte solution may also contain additives. These additives can form a film on the positive or negative electrode through a chemical reaction within the battery. For example, they can form a positive electrode interface film on the positive electrode and a negative electrode interface film on the negative electrode.

[0067] After the case body 110 and the case cover 130 are combined, the electrolyte may be injected into the interior of the case body 110 through the injection hole 133. The injection hole 133 may be sealed by a sealing plug after the electrolyte is injected.

[0068] The exhaust notch 150 may be provided on one surface of the housing including the housing body 110 and the housing cover 130 to adjust the internal pressure of the battery cell 100. The exhaust notch 150 may be recessed in at least one of one surface of the housing body 110 and one surface of the housing cover 130.

[0069] For example, the exhaust notch 150 may be provided on one side of the housing body 110. As another example, the exhaust notch 150 may be provided on one side of the housing cover 130. When the internal pressure of the battery cell 100 reaches a preset pressure, the exhaust notch 150 may be cut open and opened. The exhaust notch 150 may include a groove that is recessed from the outer surface of the housing toward the interior of the housing. For example, the exhaust notch 150 may include a groove that is recessed from the outer surface of at least one of a side of the housing body 110 and a side of the housing cover 130 toward the interior of the housing.

[0070] exist Figure 1In the figure, the exhaust notch 150 is shown as being provided on the outer surface of the housing body 110 facing the housing cover 130, but the embodiment is not limited thereto. For example, the exhaust notch 150 may be provided on the housing cover 130. The following description will be based on the housing body 110. Therefore, the following description will be based on the housing body 110. However, when the exhaust notch 150 is provided on the housing cover 130, the description of the housing body 110 related to the exhaust notch 150 also applies substantially the same to the housing cover 130.

[0071] The external terminals 131 may be provided on the case cover 130. The external terminals 131 may be spaced apart from each other along the first direction X on one surface of the case cover 130. The external terminals 131 may be exposed at an upper portion of the case cover 130. The external terminals 131 may connect the electrode assembly accommodated in the case body 110 and an external power source.

[0072] Figure 2 Is used to illustrate Figure 1 Figure 1 shows the exhaust notch section.

[0073] Reference Figure 2 The exhaust notch portion 150 may include a straight portion 151 and a curved portion 152. The straight portion 151 may have a straight line pattern, and the curved portion 152 may have a curved pattern.

[0074] The straight portion 151 may be disposed between the plurality of curved portions 152 and connect the plurality of curved portions 152. The straight portion 151 may extend between the plurality of curved portions 152. For example, the straight portion 151 may extend along the first direction X on one surface of the housing body 110.

[0075] The straight portion 151 may have a first width W151. Here, the first width W151 may refer to a width in a direction perpendicular to the direction in which the straight portion 151 extends. That is, the first width W151 of the straight portion 151 may refer to the width of the straight portion 151 in the second direction Y.

[0076] The curved portion 152 may be connected to the straight portion 151. The curved portion 152 may be connected to both ends of the straight portion 151 in the extending direction of the straight portion 151. In a plan view, the curved portion 152 may have a curved shape that does not extend linearly in a specific direction.

[0077] The curved portion 152 may have a shape that curves toward both sides from one end of the straight portion 151. For example, a single curved portion 152 connected to one end of the straight portion 151 may have a semicircular shape that is symmetrical with respect to the straight portion 151. In other words, one end of the straight portion 151 may be connected to the center of the semicircular shape of the curved portion 152. Multiple curved portions 152 connected to both ends of the straight portion 151 may have semicircular shapes that are symmetrical with respect to a direction perpendicular to the direction in which the straight portion 151 extends.

[0078] The curved portion 152 may have a second width W152. Here, the second width W152 may refer to a width in a direction perpendicular to an extending direction of a tangent line at a certain point on a boundary of the curved portion 152.

[0079] The first width W151 of the straight portion 151 and the second width W152 of the curved portion 152 may be different. Specifically, on the surface of the housing body 110 where the exhaust notch 150 is formed, the first width W151 of the straight portion 151 may be smaller than the second width W152 of the curved portion 152.

[0080] Figure 3 It is along Figure 2 Cross-sectional view taken along line AA and line BB.

[0081] Reference Figure 3 The straight portion 151 and the curved portion 152 may include grooves recessed from one surface 110S of the housing body. The one surface 110S of the housing body may be an outer surface of the housing body 110.

[0082] The first width W151 of the straight portion 151 may be the width of the straight portion 151 on one side 110S of the housing body. The first width W151 may be the maximum width of the straight portion 151, but the embodiment is not limited thereto.

[0083] The second width W152 of the curved portion 152 may be the width of the curved portion 152 on one side 110S of the housing body. The second width W152 may be the maximum width of the curved portion 152, but the embodiment is not limited thereto.

[0084] On one side 110S of the housing body, the first width W151 of the straight portion 151 may be smaller than the second width W152 of the curved portion 152. That is, the inlet width of the groove included in the straight portion 151 may be smaller than the inlet width of the groove included in the curved portion 152.

[0085] The straight portion 151 and the curved portion 152 may have a shape in which the width gradually decreases from one side 110S of the housing body in the depth direction. However, the embodiment is not limited thereto. For example, at a midpoint in the depth direction of the straight portion 151 and the curved portion 152, the width of the straight portion 151 and the curved portion 152 may be greater than the width of the straight portion 151 and the curved portion 152 on the one side 110S of the housing body.

[0086] The depth direction of the straight portion 151 and the curved portion 152 may refer to a direction perpendicular to the one side 110S of the housing body on which the straight portion 151 and the curved portion 152 are formed. For example, when the one side 110S of the housing body on which the straight portion 151 and the curved portion 152 are formed is from the first direction ( Figure 2 X) and the second direction ( Figure 2 When the plane is defined by Y), the depth direction of the straight portion 151 and the curved portion 152 may be the third direction ( Figure 1 Z).

[0087] The straight portion 151 may have a first depth D151. For example, the first depth D151 of the straight portion 151 may refer to the depth from the surface 110S of the housing body on which the straight portion 151 is formed to the maximum depth of the straight portion 151. The curved portion 152 may have a second depth D152. For example, the second depth D152 of the curved portion 152 may refer to the depth from the surface 110S of the housing body on which the curved portion 152 is formed to the maximum depth of the curved portion 152.

[0088] The first depth D151 of the straight portion 151 may be the same as the second depth D152 of the curved portion 152. That is, the maximum depths of the straight portion 151 and the curved portion 152 may be disposed at substantially the same depth from one surface 110S of the housing body.

[0089] Figure 4 : is a diagram for explaining an exhaust notch and a housing according to one embodiment. For reference, Figure 4 This is a simplified image of a shell cross section captured using the Electron Back Scatter Diffraction (EBSD) method. EBSD analyzes the material's orientation by detecting electrons reflected when accelerated electrons are injected into a sample using an EBSD analyzer mounted on a scanning electron microscope. This allows analysis of the shell's crystal structure.

[0090] Reference Figure 4The housing body 110 may include a plurality of crystal grains 110G. The plurality of crystal grains 110G may form an equiaxed structure. Specifically, the surface of the housing body 110 defining the recessed groove of the exhaust notch 150 may include a plurality of crystal grains 110G forming an equiaxed structure. That is, the plurality of crystal grains 110G may have no orientation and have similar lengths with respect to multiple axes.

[0091] This is likely due to the fact that during the process of forming the recessed grooves of the exhaust notch 150, the housing body 110 is heated, causing the plurality of crystal grains 110G to grow side by side in multiple axial directions. Before forming the recessed grooves of the exhaust notch 150, the portion of the housing body 110 where the exhaust notch 150 is formed can be heat treated, and then laser etched to form the recessed grooves of the exhaust notch 150. Therefore, during the heat treatment, the housing body 110 is heated, allowing the plurality of crystal grains 110G to form an equiaxed structure.

[0092] The housing body 110 may include a first portion 110a forming the exhaust notch portion 150 and a second portion 110b not forming the exhaust notch portion 150. The first portion 110a may overlap with the exhaust notch portion 150. The second portion 110b may not overlap with the exhaust notch portion 150. The second portion 110b may include an area other than the first portion 110a.

[0093] The sizes of the plurality of grains 110G in the first portion 110a and the sizes of the plurality of grains 110G in the second portion 110b can be uniform. For example, the standard deviation of the sizes of the plurality of grains 110G in the first portion 110a and the sizes of the plurality of grains 110G in the second portion 110b can be less than 20. Because the exhaust notch 150 is formed by laser etching the housing body 110 without applying pressure to the housing body 110, the sizes of the plurality of grains 110G in the housing body 110 can be uniform between the portion where the exhaust notch 150 is formed and the portion where the exhaust notch 150 is not formed.

[0094] The exhaust notch portion 150 may include a solidified region 155. The solidified region 155 may form a surface of the exhaust notch portion 150. Specifically, the solidified region 155 may form a straight portion ( Figure 3 151) and the curved part ( Figure 3 152). During the process of laser etching the housing body 110 to form the exhaust notch 150, a solidified region 155 may be formed. The solidified region 155 may be formed by resolidification after the housing body 110 is heated and melted by the laser.

[0095] The color of the solidification region 155 may be different from the color of the surface of the housing body 110 where the exhaust notch 150 is not formed. Specifically, the color of the solidification region 155 may be different from the color of the surface of the housing body 110 other than the surface of the exhaust notch 150. The color of the solidification region 155 may be different from the color of the straight portion ( Figure 3 151) surface and curve part ( Figure 3 The color of one surface of the housing body 110 other than the surface of the housing body 110 (not shown in FIG. 152) is different. For example, the color of the solidified region 155 may be darker than the color of the surface of the housing body 110 where the exhaust notch 150 is not formed. This may be caused by the discoloration of the solidified region 155 when the housing body 110 resolidifies after being heated and melted by the laser.

[0096] The ten-point mean roughness (Rz) of the surface of the exhaust notch 150 may be higher than the ten-point mean roughness (Rz) of the surface of the housing body 110 outside the exhaust notch 150. Here, the surface of the housing body 110 outside the exhaust notch 150 may be referred to as the outer surface. The ten-point mean roughness of the surface of the exhaust notch 150 may be higher than the ten-point mean roughness of one surface of the housing body 110.

[0097] The ten-point average roughness is a numerical value representing surface roughness. The roughness of the surface of the exhaust notch 150 and the surface of the housing body 110 can be measured using known roughness measurement methods. Therefore, the measured ten-point average roughness of the surface of the exhaust notch 150 can be higher than the ten-point average roughness of the surface of the housing body 110 without the exhaust notch 150. In other words, the surface of the exhaust notch 150 can be rougher than the surface of the housing body 110 without the exhaust notch 150.

[0098] This may be due to the fact that exhaust notch 150 is formed using a laser. If exhaust notch 150 is formed using a pressurized method rather than a laser, the surface of pressurized exhaust notch 150 may be formed flat. On the other hand, when exhaust notch 150 is formed using a laser, the surface of exhaust notch 150 may become rough during the etching process. For example, the ten-point average roughness of the surface of exhaust notch 150 may exceed 20.

[0099] The exhaust notch portion 150 may include a bottom portion 150a. The bottom portion 150a may form a bottom surface of the exhaust notch portion 150. For example, the bottom portion 150a may form a straight portion ( Figure 3 151) and the curved part ( Figure 3 The bottom portion 150a may include a straight portion ( Figure 3 The bottom 150a may include a curved portion ( Figure 3 152) bottom surface.

[0100] Figure 5 It is a diagram for explaining the exhaust notch and the housing according to another embodiment. Figure 4 Explain the differences.

[0101] Reference Figure 5 The exhaust notch 150 may include a bottom 150a and a groove 150b. The groove 150b may be recessed deeper than the bottom 150a on both sides of the bottom 150a. The groove 150b may be provided on both sides of the bottom 150a in the width direction of the exhaust notch 150. That is, the depth from one side of the housing body 110 to the bottom 150a may be less than the depth from one side of the housing body 110 to the groove 150b. This may be due to heat concentration at the edge of the groove of the exhaust notch 150 during the process of forming the exhaust notch 150 using a laser.

[0102] Figure 6 This is a diagram for explaining an exhaust notch according to another embodiment. Figure 2 Explain the differences.

[0103] Reference Figure 6 , the straight portion 151 may be connected to the semicircular ends of the curved portion 152 instead of the center. The curved portion 152 may be bent toward one side from both ends of the straight portion 151. A curved portion 152 connected to one end of the straight portion 151 may not be symmetrical with respect to the straight portion 151. In other words, the curved portion 152 may be provided only on one side relative to the direction in which the straight portion 151 extends, and may not be provided on the other side.

[0104] Figure 7 This is a diagram for explaining the exhaust notch according to another embodiment. Figure 2 The difference.

[0105] Reference Figure 7 The exhaust notch portion 150 may include a connecting portion 153 connecting the straight portion 151 and the curved portion 152 . The connecting portion 153 may be provided between the straight portion 151 and the curved portion 152 .

[0106] The connecting portion 153 may have a third width W153. The third width W153 of the connecting portion 153 may be different from the first width W151 of the straight portion 151 and the second width W152 of the curved portion 152. For example, the third width W153 of the connecting portion 153 may be smaller than the first width W151 of the straight portion 151 and the second width W152 of the curved portion 152. As another example, the third width W153 of the connecting portion 153 may be larger than the first width W151 of the straight portion 151 and smaller than the second width W152 of the curved portion 152. The depth of the connecting portion 153 may be the same as the depth of the straight portion 151 and the depth of the curved portion 152.

[0107] exist Figure 7 , the connection portion 153 is shown to have a straight line pattern, but the embodiment is not limited thereto. For example, the connection portion 153 may have a curved line pattern.

[0108] Figure 8 This is a diagram for explaining a method for manufacturing a venting notch according to an embodiment. Figure 2 Explain the differences.

[0109] Reference Figure 8 The cell case manufacturing method may include forming a venting notch 150 on one side of the cell case, wherein the venting notch 150 includes a straight portion 151 having a straight line pattern and a curved portion 152 connected to the straight portion 151 and having a curved line pattern. Furthermore, the cell case manufacturing method may include heat treating the portion of the cell case where the venting notch 150 is to be formed before forming the venting notch 150.

[0110] The housing body ( Figure 1 110) side or housing cover ( Figure 1 A groove is formed on one side of the housing 130 ), thereby forming a gas exhaust notch portion 150 .

[0111] The laser pattern LP may extend in a direction extending along the straight portion 151 and in a direction perpendicular thereto. For example, the laser pattern LP may include a plurality of straight line patterns extending along a first direction X and a second direction Y. In other words, forming the venting notch may include etching a surface of the cell casing along the first direction X and the second direction Y using a laser.

[0112] The laser used to form the exhaust notch portion 150 may heat and melt the housing body ( Figure 1 110) side or housing cover ( Figure 1 130) side for etching.

[0113] In the first direction X in which straight portion 151 extends, the period in which the laser light intersects the straight line pattern of straight portion 151 along laser pattern LP can be greater than the period in which the laser light intersects the curved line pattern of curved portion 152. Therefore, in the direction in which straight portion 151 extends, the curved line pattern of curved portion 152, with which the laser light intersects more frequently than the straight line pattern of straight portion 151, can be etched relatively more deeply. Therefore, by making the width of curved portion 152 greater than the width of straight portion 151, the depth of curved portion 152 and the depth of straight portion 151 can be uniformly etched.

[0114] Figure 9 This is a diagram for explaining a battery cell according to another embodiment. Figure 1 Explain the differences.

[0115] Reference Figure 9 The exhaust notch 150 may be provided on a surface of the housing body 110 adjacent to the housing cover 130. A plurality of external terminals 131 may be provided on the housing covers 130 facing each other, the housing covers 130 closing the opening surface of the housing body 110 opened in the first direction X.

[0116] The present disclosure can be implemented in various modified forms, and the scope of the rights of the present disclosure is not limited to the above-mentioned embodiments. Therefore, as long as the modified embodiments include the components of the present disclosure, they should be considered to fall within the scope of the rights of the present disclosure.

Claims

1. A battery cell comprising: The shell body accommodates the electrode assembly; a housing cover, covering at least one side of the opening of the housing body; as well as The exhaust notch is formed in a recessed manner on at least one of one surface of the housing body and one surface of the housing cover. The exhaust notch portion includes: a straight line portion having a straight line pattern; as well as a curved portion connected to the straight portion and having a curved pattern, The width of the straight portion is different from the width of the curved portion.

2. The battery cell according to claim 1, wherein: On one surface of the housing body or one surface of the housing cover where the exhaust notch is formed, the width of the straight portion is smaller than the width of the curved portion.

3. The battery cell according to claim 1, wherein: The depth of the straight portion is the same as the depth of the curved portion.

4. The battery cell according to any one of claims 1 to 3, wherein The exhaust notch portion further includes a solidified region, and the solidified region forms a surface of the straight portion and a surface of the curved portion.

5. The battery cell according to claim 4, wherein: The solidification region has a color different from a color of at least one of the one surface of the housing body and the one surface of the housing cover other than the surface of the straight portion and the surface of the curved portion.

6. The battery cell according to any one of claims 1 to 3, wherein: The exhaust notch portion further includes a connecting portion, which is provided between the straight portion and the curved portion to connect the straight portion and the curved portion. The width of the connecting portion is different from the width of the straight portion and the width of the curved portion.

7. The battery cell according to any one of claims 1 to 3, wherein: The ten-point average roughness of the surface of the exhaust notch is higher than the ten-point average roughness of at least one of the one surface of the housing body and the one surface of the housing cover.

8. The battery cell according to any one of claims 1 to 3, wherein: The exhaust notch portion further comprises: a bottom portion forming a bottom surface of at least one of the straight portion and the curved portion; and The groove is recessed deeper than the bottom on both sides of the bottom.

9. The battery cell according to any one of claims 1 to 3, wherein: The exhaust notch portion further includes a groove that is recessed inward from an outer surface of at least one of one surface of the housing body and one surface of the housing cover.

10. The battery cell according to claim 9, wherein: The surface of the housing body or the surface of the housing cover defining the groove contains a plurality of grains, The plurality of grains form an equiaxed structure.

11. The battery cell according to claim 1, wherein: The exhaust notch is provided on an outer surface of the housing body facing the housing cover.

12. A method for manufacturing a battery cell shell, the battery cell comprising: The shell body accommodates the electrode assembly; and a shell cover covering at least one side of the opening of the shell body, the battery cell shell manufacturing method comprising: An exhaust notch is formed on one side of the cell housing, the exhaust notch comprising: a straight portion having a straight pattern; and a curved portion connected to the straight portion and having a curved pattern. The width of the straight portion is smaller than the width of the curved portion, The depth of the straight portion is the same as the depth of the curved portion.

13. The method for manufacturing a battery cell casing according to claim 12, wherein: Forming the exhaust notch portion includes: A laser is used to etch one side of the cell casing along a first direction in which the straight line pattern extends and a second direction perpendicular to the first direction.

14. The method for manufacturing a battery cell casing according to claim 13, wherein: In the first direction, a period at which the laser intersects the straight line pattern is greater than a period at which the laser intersects the curved line pattern.

15. The method for manufacturing a battery cell casing according to claim 12, further comprising: Before forming the exhaust notch, a portion of one surface of the cell case where the exhaust notch is to be formed is subjected to heat treatment.

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