Battery case, battery pack comprising same, and vehicle

Abstract

A battery case, according to the present invention, comprises: a pack frame configured to form a receiving space for a plurality of battery cells; a case lid configured to cover the receiving space; and a gasket interposed between the pack frame and the case lid. The gasket comprises: a plurality of coupling portions which are regions pressed by a fastening member; and at least one spacing portion which is located between two coupling portions which are adjacent to each other, wherein the thickness of a first point on the plurality of coupling portions may be different from the thickness of a second point on the at least one spacing portion.

Description

Battery case and battery pack including same, automobile

[0001] The present invention relates to a battery case, a battery pack including the same, and an automobile.

[0002] As demand for portable electronic products such as laptops, video cameras, and mobile phones rapidly increases and the commercialization of robots and electric vehicles becomes more widespread, research into high-performance secondary batteries capable of repeated charging and discharging is actively underway.

[0003] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are in the spotlight for their advantages of being free to charge and discharge, having a very low self-discharge rate, and high energy density, as they have almost no memory effect, which is a phenomenon in which the chargeable capacity of a battery decreases when charging without completely discharging the battery, compared to nickel-based secondary batteries.

[0004] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0005] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0006] Recently, secondary batteries are widely used for driving or energy storage not only in small devices such as portable electronic devices but also in medium and large devices such as electric vehicles and energy storage systems (ESS).

[0007] These secondary batteries can be housed together inside a module case while being electrically connected in large numbers to form a single battery module, and these battery modules are electrically connected again in a narrow space to form a battery pack to increase energy density.

[0008] The battery cases included in these battery modules or battery packs are equipped with gaskets to seal the internal space. These gaskets have areas where their airtightness is compromised depending on their location, leading to gas leaks generated internally. Therefore, there is a pressing need to develop a battery case that improves airtightness and maintains consistent airtightness throughout the entire body.

[0009] The present invention was created in consideration of the above-described problems, and has as its primary purpose the provision of a battery case with improved confidentiality.

[0010] A battery case according to one embodiment of the present invention comprises: a pack frame configured to form a space for accommodating a plurality of battery cells; a case lid configured to cover the space for accommodating a plurality of battery cells; and a gasket interposed between the pack frame and the case lid; wherein the gasket comprises: a plurality of connecting portions which are regions pressed by a fastening member; and at least one spacer portion positioned between two adjacent connecting portions, wherein a thickness at a first point of the plurality of connecting portions may be different from a thickness at a second point of the at least one spacer portion.

[0011] The gasket may have a thickness at the second point that is thicker than that at the first point.

[0012] The gasket may have a thickness at the second point that is less than 1.167 times the thickness at the first point.

[0013] The gasket may have a thickness at the second point that is equal to or greater than 1.033 times the thickness at the first point, and may have a thickness at the first point that is equal to or greater than 1.1 times the thickness at the first point.

[0014] The gasket may have a thickness at the second point equal to 1.067 times the thickness at the first point.

[0015] The gasket may be thickest at the second point.

[0016] The second point can be defined as the midpoint of two adjacent joints.

[0017] The thickness gradient of the section between two adjacent joints may be symmetrical with respect to the second point.

[0018] The gasket may be such that the second point is contained within the maximum thickness range of the separation portion.

[0019] The gasket is provided at the center between two adjacent joints and may include a maximum thickness section having the same thickness as the second point.

[0020] The length of the maximum thickness section may be greater than 0.1 times the length between two adjacent joints and less than 0.15 times the length between two adjacent joints.

[0021] The gasket may include a sloped section having a thickness that is thinner than the thickness of the second point and thicker than the thickness of the first point.

[0022] The slope section may include a first slope section starting from a point where the maximum thickness section ends adjacent to one of the two adjacent joints; and a second slope section starting from a point where the maximum thickness section ends adjacent to the other of the two adjacent joints.

[0023] The length of the first slope section and the length of the second slope section may be the same length as the maximum thickness section.

[0024] A battery pack according to one embodiment of the present invention may include a battery case according to the present invention.

[0025] A vehicle according to one embodiment of the present invention may include a battery pack according to the present invention.

[0026] According to one aspect of the present invention, the gastightness can be maintained approximately consistently throughout the entire area of ​​the gasket. Since the gasket is directly pressed by the fastening member only at a plurality of joints, the pressing force at the separated portions may be relatively lower than that at the joined portions. To address this, by making the thickness of the separated portions thicker than that of the joined portions, the gasket can be directly pressed by the fastening member at the plurality of joints, thereby ensuring the gastightness, and the increased thickness at the separated portions can ensure the gastightness. Therefore, when the internal pressure of the battery case increases, gas is prevented from leaking between the case lid and the gasket or between the pack frame and the gasket in the area corresponding to the separated portions at a pressure lower than the designed venting pressure, and the gas can be discharged to a desired location through a venting device or the like.

[0027] FIG. 1 is an exploded perspective view of a battery case according to one embodiment of the present invention.

[0028] Figure 2 is a perspective view of a combined battery case according to one embodiment of the present invention.

[0029] FIG. 3 is a drawing showing a gasket included in a battery case according to one embodiment of the present invention.

[0030] FIG. 4 is a drawing showing the coupling relationship of a pack frame, a case lead, a gasket, and a fastening member included in a battery case according to one embodiment of the present invention.

[0031] FIG. 5 is a drawing showing the thickness gradient of a gasket included in a battery case according to one embodiment of the present invention.

[0032] Figure 6 is a drawing showing the results of a simulation according to Comparative Example 1.

[0033] Figure 7 is a drawing showing the simulation results according to Example 1 of the present invention.

[0034] Figure 8 is a drawing showing the simulation results according to Example 2 of the present invention.

[0035] Figure 9 is a drawing showing the simulation results according to Example 3 of the present invention.

[0036] Figure 10 is a drawing showing the simulation results according to Example 4 of the present invention.

[0037] Figure 11 is a drawing showing the simulation results according to Example 5 of the present invention.

[0038] Figure 12 is a drawing showing the simulation results according to Comparative Example 2.

[0039] FIG. 13 is a drawing showing a vehicle according to one embodiment of the present invention.

[0040] Before going into the detailed description of the present invention, it should be noted that the terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but rather should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best way. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0041] The same reference numbers or symbols used in each drawing attached to this specification represent parts or components that perform substantially the same functions. For convenience of explanation and understanding, the same reference numbers or symbols may be used in different embodiments. In other words, even if components with the same reference numbers are depicted in multiple drawings, they do not necessarily represent a single embodiment.

[0042] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprises" or "comprises" should be understood to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0043] In addition, in the description below, expressions such as top, upper, lower, lower, side, front, and rear are expressed based on the direction shown in the drawing, and it is noted in advance that they may be expressed differently if the direction of the object in question changes.

[0044] Additionally, terms including ordinal numbers, such as "first," "second," etc., may be used in this specification and claims to distinguish between components. These ordinal numbers are used to distinguish identical or similar components from each other, and the use of these ordinal numbers should not be interpreted in a limited manner. For example, components associated with these ordinals should not be interpreted in a restricted manner, such as in the order of use or arrangement, based on their numbers. If necessary, each ordinal number may be used interchangeably.

[0045] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, the spirit of the present invention is not limited to the presented embodiments. For example, those skilled in the art who understand the spirit of the present invention may propose other embodiments within the spirit of the present invention by adding, modifying, or deleting components, etc., but such embodiments will also be considered to be within the spirit of the present invention. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0046] Fig. 1 is an exploded perspective view of a battery case (100) according to one embodiment of the present invention. Fig. 2 is a combined perspective view of a battery case (100) according to one embodiment of the present invention.

[0047] Referring to FIGS. 1 and 2, the battery case (100) may include a pack frame (120), a case lid (130), and a gasket (140).

[0048] The pack frame (120) may be configured to form a space for accommodating a plurality of battery cells (10). The space may accommodate a battery module including a plurality of battery cells (10). For example, when the pack frame (120) accommodates a plurality of battery modules, the pack frame (120) may be provided with a frame body (123) and a partition wall (125). The frame body (123) may be configured in a box shape with an open top to accommodate a plurality of battery cells (10) therein. The partition wall (125) may partition the internal space of the frame body (123). The partition wall (125) may be provided in a space corresponding to the space between adjacent battery cells (10). Meanwhile, the pack frame (120) is not limited to the structure illustrated and described herein, and for example, the frame body (123) may be configured with a bottom plate, an end plate, a front plate, a side plate, etc.

[0049] The case lid (130) may be configured to cover the receiving space. The case lid (130) may be configured in the form of a cover that covers the upper opening of the pack frame (120) body.

[0050] A gasket (140) may be interposed between the pack frame (120) and the case lid (130). The gasket (140) may seal the space between the pack frame (120) and the case lid (130). The gasket (140) may be interposed along the perimeter of the pack frame (120) and the case lid (130).

[0051] FIG. 3 is a drawing showing a gasket (140) included in a battery case (100) according to one embodiment of the present invention. FIG. 4 is a drawing showing a coupling relationship between a pack frame (120), a case lid (130), a gasket (140), and a fastening member (110) included in a battery case (100) according to one embodiment of the present invention. FIG. 5 is a drawing showing a thickness gradient of a gasket (140) included in a battery case (100) according to one embodiment of the present invention.

[0052] Referring to FIGS. 3 to 5, the gasket (140) may include a plurality of connecting portions (143) and spacing portions (145).

[0053] The plurality of joints (143) can be pressed by a fastening member (110). The fastening member (110) can be a screw.

[0054] A plurality of connecting portions (143) may be spaced apart from each other by a predetermined distance. The connecting portion (143) may be an area that is directly pressed by the connecting member (110) when the connecting member (110) is connected to the case lid (130).

[0055] The separation portion (145) may be located between two adjacent joining portions (143). The separation portion (145) may be an area indirectly pressed by the joining member (110) when the joining member (110) is joined to the case lid (130).

[0056] For example, when the fastening member (110) is a screw, the connecting portion (143) may be an area projected onto the underside of the head of the screw, and the separation portion (145) may be an area remaining excluding the connecting portion (143).

[0057] The thickness of the first point (A) of the connecting portion (143) may be different from the thickness of the second point (B) of the separating portion (145). That is, at least a portion of the separating portion (145) may have a different thickness from the thickness of the connecting portion (143). The thickness of the connecting portion (143) may be constant over the entire area. This is to facilitate fastening when the fastening member (110) is connected to the connecting portion (143).

[0058] The thickness of the second point (B) may be thicker than the thickness of the first point (A). That is, the thickness of at least a portion of the separation portion (145) may be thicker than the thickness of the joining portion (143).

[0059] According to this configuration of the present invention, the airtightness can be maintained approximately consistently over the entire area of ​​the gasket (140). Since the gasket (140) is directly pressed by the fastening member (110) only at the plurality of joints (143), the pressing force may be relatively lower at the separated portion (145) compared to the joint portion (143). By making the thickness of the separated portion (145) thicker than the thickness of the joint portion (143), the plurality of joint portions (143) of the gasket (140) are directly pressed through the fastening member (110), thereby ensuring airtightness, and the increased thickness can be used to ensure airtightness at the separated portion (145). Accordingly, when the internal pressure of the battery case (100) increases, gas can be prevented from leaking between the case lead (130) and the gasket (140) or between the pack frame (120) and the gasket (140) in the area corresponding to the separation portion (145) at a pressure lower than the designed venting pressure, and even when the internal pressure further increases to a pressure higher than the venting pressure, the gas can be discharged to a desired location through a venting device or the like.

[0060] As described above, the thickness of the separation portion (145) may be configured to be pressed to the same or similar degree in the area of ​​the joint portion (143). That is, if the thickness of the separation portion (145) is configured to be excessively thick, the airtightness may actually be reduced, and therefore, an appropriate thickness setting is required.

[0061] Therefore, a simulation was conducted to set an appropriate thickness of the separation portion (145). The simulation was conducted for the case where the thickness of the case lead (130) was 2 mm, the thickness of the joint portion (143) of the gasket (140) was 3 mm, and the fastening member (110) was fastened with a torque of 10 Nm. In this case, the minimum value of the contact pressure of the gasket (140) in the area between two adjacent joint portions (143) was measured while adjusting the thickness of the separation portion (145). The results of this measurement are as follows.

[0062]

[0063] Fig. 6 is a diagram showing the results of a simulation according to Comparative Example 1. Fig. 7 is a diagram showing the results of a simulation according to Example 1 according to the present invention. Fig. 8 is a diagram showing the results of a simulation according to Example 2 according to the present invention. Fig. 9 is a diagram showing the results of a simulation according to Example 3 according to the present invention. Fig. 10 is a diagram showing the results of a simulation according to Example 4 according to the present invention. Fig. 11 is a diagram showing the results of a simulation according to Example 5 according to the present invention. Fig. 12 is a diagram showing the results of a simulation according to Comparative Example 2.

[0064] The simulation results according to comparative examples and embodiments according to the present invention will be described with reference to FIGS. 6 to 12.

[0065] In Comparative Example 1, where the thickness of the second point (B) of the separation portion (145) was set to be the same as the thickness of the first point (A) of the joining portion (143) at 3 mm, the minimum value of the contact pressure of the gasket (140) was measured to be 5 MPa.

[0066] Example 1, in which the thickness of the second point (B) of the separation portion (145) was set to 1.033 times the thickness of the first point (A) of the joining portion (143), increased the contact pressure of the gasket (140) by 12% compared to Comparative Example 1.

[0067] Example 2, in which the thickness of the second point (B) of the separation portion (145) was set to 1.067 times the thickness of the first point (A) of the joining portion (143), increased the contact pressure of the gasket (140) by 22% compared to Comparative Example 1.

[0068] Example 3, in which the thickness of the second point (B) of the separation portion (145) was set to 1.1 times the thickness of the first point (A) of the joining portion (143), increased the contact pressure of the gasket (140) by 18% compared to Comparative Example 1.

[0069] Example 4, in which the thickness of the second point (B) of the separation portion (145) was set to 1.133 times the thickness of the first point (A) of the joining portion (143), increased the contact pressure of the gasket (140) by 12% compared to Comparative Example 1.

[0070] Example 5, in which the thickness of the second point (B) of the separation portion (145) was set to 1.167 times the thickness of the first point (A) of the joining portion (143), increased the contact pressure of the gasket (140) by 4% compared to Comparative Example 1.

[0071] Comparative Example 2, in which the thickness of the second point (B) of the separation portion (145) was set to 1.2 times the thickness of the first point (A) of the joining portion (143), showed a 4% decrease in the contact pressure of the gasket (140) compared to Comparative Example 1.

[0072] Looking at the overall simulation data, when the thickness of the second point (B) of the separation portion (145) was 1.067 times the thickness of the first point (A) of the joining portion (143), the contact pressure of the gasket (140) increased the most compared to Comparative Example 1. In addition, according to Comparative Example 2, when the thickness of the second point (B) of the separation portion (145) was 1.2 times the thickness of the first point (A) of the joining portion (143), the contact pressure actually decreased compared to Comparative Example 1.

[0073] Therefore, in order to increase the contact pressure of the gasket (140) compared to Comparative Example 1, the thickness of the separation portion (145) can satisfy the numerical ranges below.

[0074] The thickness of the second point (B) may be thicker than the thickness of the first point (A), and may be equal to or thinner than 1.167 times the thickness of the first point (A).

[0075] The thickness of the second point (B) may be thicker than the thickness of the first point (A), and may be equal to or thinner than 1.133 times the thickness of the first point (A).

[0076] The thickness of the second point (B) may be thicker than the thickness of the first point (A), and may be equal to or thinner than 1.1 times the thickness of the first point (A).

[0077] The thickness of the second point (B) may be thicker than the thickness of the first point (A), and may be equal to or thinner than 1.067 times the thickness of the first point (A).

[0078] The thickness of the second point (B) may be equal to or thicker than 1.033 times the thickness of the first point (A), and may be equal to or thinner than 1.167 times the thickness of the first point (A).

[0079] The thickness of the second point (B) may be equal to or thicker than 1.033 times the thickness of the first point (A), and may be equal to or thinner than 1.133 times the thickness of the first point (A).

[0080] The thickness of the second point (B) may be equal to or thicker than 1.033 times the thickness of the first point (A), and may be equal to or thinner than 1.1 times the thickness of the first point (A).

[0081] The thickness of the second point (B) may be equal to or thicker than 1.033 times the thickness of the first point (A), and may be equal to or thinner than 1.067 times the thickness of the first point (A).

[0082] The thickness of the second point (B) may be equal to or thicker than 1.067 times the thickness of the first point (A), and may be equal to or thinner than 1.167 times the thickness of the first point (A).

[0083] The thickness of the second point (B) may be equal to or thicker than 1.067 times the thickness of the first point (A), and may be equal to or thinner than 1.133 times the thickness of the first point (A).

[0084] The thickness of the second point (B) may be equal to or thicker than 1.067 times the thickness of the first point (A), and may be equal to or thinner than 1.1 times the thickness of the first point (A).

[0085] The thickness of the second point (B) may be equal to or thicker than 1.1 times the thickness of the first point (A), and may be thinner than 1.167 times the thickness of the first point (A).

[0086] The thickness of the second point (B) may be equal to or thicker than 1.1 times the thickness of the first point (A), or may be equal to or thinner than 1.133 times the thickness of the first point (A).

[0087] The thickness of the second point (B) may be equal to or thicker than 1.133 times the thickness of the first point (A), or may be equal to or thinner than 1.167 times the thickness of the first point (A).

[0088] Preferably, the thickness of the second point (B) may be equal to or thicker than 1.033 times the thickness of the first point (A), and may be equal to or thinner than 1.133 times the thickness of the first point (A).

[0089] Preferably, the thickness of the second point (B) may be equal to or thicker than 1.033 times the thickness of the first point (A), and may be equal to or thinner than 1.1 times the thickness of the first point (A).

[0090] Preferably, the thickness of the second point (B) may be equal to or thicker than 1.067 times the thickness of the first point (A), and may be equal to or thinner than 1.1 times the thickness of the first point (A).

[0091] Preferably, the thickness of the second point (B) may be 1.067 times the thickness of the first point (A).

[0092] Referring again to Fig. 5, the gasket (140) used in the simulation will be described in more detail.

[0093] The gasket (140) may have its thickest thickness at a second point (B). The second point (B) may be defined as the central point (M) of two adjacent joints (143A, 143B).

[0094] The thickness gradient of the gasket (140) between two adjacent joints (143A, 143B) may be symmetrical with respect to the second point (B).

[0095] The gasket (140) may include a maximum thickness section (L1). The second point (B) may be included within the maximum thickness section (L1). The maximum thickness section (L1) may be provided at the center between two adjacent joints (143A, 143B).

[0096] In the gasket (140), regions with different thicknesses (L1, L2, L3 in FIG. 5) may have a certain margin region from the boundary of the adjacent joint portion (143). The margin region may refer to a region among the separated portions (145) that has the same thickness as the joint portion (143). When the regions with different thicknesses (L1, L2, L3) are located at the center of the separated portion (145), the margin regions may be provided on both sides between the two adjacent joint portions (143). Since the region adjacent to the joint portion (143) among the separated portions (145) receives an indirect force according to the pressure of the fastening member (110) depending on the material properties of the gasket (140), etc., and thus the airtightness is largely guaranteed, the central region of the separated portion (145) with relatively low airtightness may have different thicknesses.

[0097] For example, the length of the maximum thickness section (L1) may be greater than 0.1 times the length (L) between two adjacent joints (143A, 143B) and less than 0.15 times the length (L) between two adjacent joints (143A, 143B). In the simulation model, the length (L) between the two joints (143A, 143B) was set to 70 mm, and the length of the maximum thickness section (L1) was set to 8 mm.

[0098] The gasket (140) may include a sloped section. The sloped section may be thinner than the thickness of the second point (B) and thicker than the thickness of the first point (A). That is, the sloped section may be thinner than the thickness of the maximum thickness section (L1) and thicker than the thickness of the joint (143).

[0099] The slope section may include a first slope section (L2) and a second slope section (L3). The first slope section (L2) may start from a point where the maximum thickness section (L1) ends adjacent to one of the two adjacent joints (143A, 143B). The second slope section (L3) may start from a point where the maximum thickness section (L1) ends adjacent to the other of the two adjacent joints (143A, 143B).

[0100] The length of the first slope section (L2) may be the same as the length of the maximum thickness section (L1). The length of the second slope section (L3) may be the same as the length of the maximum thickness section (L1). In the simulation model, the length of the first slope section (L2) and the length of the second slope section (L3) were set to 8 mm to be the same as the length of the maximum thickness section (L1).

[0101] As another embodiment, the sealing of the gasket (140) can be secured by including a slope section that forms a gentle slope from the second point (B) of the separation section (145) to the boundary of the joining section (143), i.e., by configuring it so that there is no margin area.

[0102] As another example, the regions of different thicknesses described above may have a curved shape as a whole rather than a straight slope, so that the thickness gradually increases or decreases, thereby minimizing the occurrence of discontinuous protrusions.

[0103] Referring back to FIG. 1, the battery pack (3) may include a battery case (100). Although not shown in the drawing, the battery pack (3) may further include various other components in addition to the plurality of battery cells (10) and the battery case (100), such as components of the battery pack (3) known at the time of filing of the present invention, such as a BMS, a relay, a current sensor, etc.

[0104] Fig. 13 is a drawing showing a vehicle (1) according to the present invention.

[0105] Referring to Fig. 13, the automobile (1) may include a battery pack (3). In addition to the battery pack (3), the automobile (1) may further include various other components included in the automobile (1). For example, in addition to the battery pack (3) according to the present invention, the automobile (1) may further include a body, a motor, a control device such as an ECU (electronic control unit), etc.

[0106] While the present invention has been described with reference to the accompanying drawings, focusing on preferred embodiments, it will be apparent to those skilled in the art that numerous obvious modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should be construed as encompassing the many examples of such modifications within the scope of the claims.

[0107] [Explanation of symbols]

[0108] 1 car

[0109] 3 battery packs

[0110] 10 battery cells

[0111] 100 Battery Case

[0112] 110 Absence of a contract

[0113] 120 pack frame

[0114] 123 frame body

[0115] 125 bulkhead

[0116] 130 case leads

[0117] 140 gasket

[0118] 143 joint

[0119] 143A joint

[0120] 143B other joint

[0121] A Branch 1

[0122] 145 separation

[0123] B 2nd branch

[0124] M Central District Prosecutors' Office

[0125] L is the length between two adjacent joints

[0126] L1 maximum thickness section

[0127] L2 1st slope section

[0128] L3 2nd slope section

Claims

1. A pack frame configured to form a space for accommodating a plurality of battery cells; A case lid configured to cover the above-mentioned accommodation space; and A gasket interposed between the pack frame and the case lid; The above gasket, a plurality of joints which are areas pressurized by the fastening member; and comprising at least one spacer positioned between two adjacent joining portions, A battery case characterized in that the thickness of the first point of the plurality of connecting portions is different from the thickness of the second point of the at least one separation portion.

2. In paragraph 1, The above gasket, A battery case characterized in that the thickness of the second point is thicker than the thickness of the first point.

3. In paragraph 2, The above gasket, A battery case characterized in that the thickness of the second point is thinner than 1.167 times the thickness of the first point.

4. In paragraph 3, The above gasket, A battery case characterized in that the thickness of the second point is equal to or thicker than 1.033 times the thickness of the first point, and equal to or thinner than 1.1 times the thickness of the first point.

5. In paragraph 3, The above gasket, A battery case characterized in that the thickness of the second point is 1.067 times the thickness of the first point.

6. In paragraph 2, The above gasket, A battery case characterized in that the thickness at the second point is the thickest.

7. In paragraph 6, The second point above is, A battery case characterized in that the central point of the two mutually adjacent joints is defined.

8. In paragraph 7, The above gasket, A battery case characterized in that the thickness gradient of the section between the two adjacent joints is symmetrical with respect to the second point.

9. In paragraph 8, The above gasket, A battery case characterized in that the second point is included within the maximum thickness section of the separation portion.

10. In paragraph 9, The length of the above maximum thickness section is, A battery case characterized in that the length between the two adjacent connecting portions is greater than 0.1 times and less than 0.15 times the length between the two adjacent connecting portions.

11. In paragraph 9, The above gasket, A battery pack case characterized by including an inclined section having a thickness that is thinner than the thickness of the second point and thicker than the thickness of the first point.

12. In paragraph 11, The above slope section is, A battery pack case characterized by comprising: a first inclined section starting from a point where the maximum thickness section ends adjacent to one of the two mutually adjacent joints; and a second inclined section starting from a point where the maximum thickness section ends adjacent to the other of the two mutually adjacent joints.

13. In paragraph 12, The length of the first slope section and the length of the second slope section are, A battery pack case characterized by having a length equal to the above maximum thickness section.

14. A battery pack comprising a battery pack case according to any one of claims 1 to 13.

15. A vehicle comprising a battery pack according to Article 14.

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