Pouch-type battery case, secondary battery, and battery forming apparatus

Abstract

In a pouch-type battery case (10) configured to accommodate an electrode assembly (21) having a structure in which electrodes (23, 25) and separators (24) are alternately arranged, the battery case (10) comprises: a pouch film (1) having a film thickness (d1), a first surface (31), and a second surface (34); a first cup portion (13) formed in the pouch film (1) and having a recessed shape offset from the first surface (31) towards the second surface (34); a second cup portion (15) formed in the pouch film (1) and having a recessed shape offset from the first surface (31) towards the second surface (34); and a bridge portion (14) formed in the pouch film (1) between the first cup portion (13) and the second cup portion (15) and connecting the first cup portion (13) to the second cup portion (15); the bridge portion (14) includes a recess (41) formed in the first surface (31) and protruding toward the second surface (34).

Description

Technical Field

[0001] The present disclosure relates to a pouch-type battery case, a secondary battery, and a battery forming apparatus. Background Art

[0002] In modern society, with the popularization of portable devices such as mobile phones, laptops, video cameras, and digital cameras, the development of battery technology is of great significance. In addition, in order to try to solve the problems of air pollution caused by existing internal combustion engine vehicles using fossil fuels and reduce carbon dioxide emissions, rechargeable / dischargeable secondary batteries have become an indispensable power source for electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (P-HEV), etc. Therefore, the demand for improvement of secondary batteries is growing.

[0003] Currently commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have attracted much attention due to various beneficial aspects, for example, compared with nickel-based secondary batteries, they show almost no memory effect and can be charged and discharged freely, and they show very low self-discharge rate and high energy density.

[0004] Secondary batteries can be classified into cylindrical batteries having an electrode assembly installed in a cylindrical metal can, square batteries having an electrode assembly installed in a square metal can, and pouch-type batteries based on the shape of the battery case. Pouch-type secondary batteries generally accommodate an electrode assembly having a structure in which electrodes and separators are alternately arranged in a pouch-shaped case made of laminated aluminum sheets.

[0005] In addition, secondary batteries can be classified based on the structure in which the positive electrode and the negative electrode are stacked with the separator inserted between the positive electrode and the negative electrode. Generally, there may be a stacked (laminated) type structure, etc., in which a plurality of positive electrodes and negative electrodes cut into a predetermined unit size are sequentially stacked with the separator inserted between the positive electrode and the negative electrode. In recent years, in order to solve the problems caused by the core-roll type electrode assembly and the stacked type electrode assembly, a stacked / folded type electrode assembly has been developed, which is a combination of the core-roll type electrode assembly and the stacked type electrode assembly. This stacked type electrode assembly may also be referred to as an electrode stack assembly.

[0006] Reference Figures 1 to 4 , the manufacturing method of the pouch type secondary battery may include a forming process in which a portion of a film (pouch film) 1000 is formed to provide a cup 1005 (or a receiving space 1005) surrounding a recess corresponding to a surface area of ​​the electrode assembly 1010. In particular, the forming process may include press-forming the pouch film to form the cup in the film.

[0007] Reference Figure 1, the bag forming apparatus 300 generally includes an upper mold 301 and a lower mold 302. The upper mold 301 and the lower mold 302 are operable to move relative to each other (e.g., toward and / or away from each other). Specifically, the lower mold 302 is operable to move toward and away from the upper mold 301, and / or the upper mold 301 is operable to move toward and away from the lower mold 302. Alternatively or additionally, during the formation of the bag (i.e., during the operation of the apparatus 300), at least one of the upper mold 301 and the lower mold 302 may not be moved.

[0008] The apparatus 300 may include a mold portion 304 operably coupled to the lower mold 302. Initially, the mold portion 304 may be disposed below the lower mold 302 and / or at the bottom of the lower mold 302. For example, the lower mold 302 may include a side wall ( Figure 1 301 ), and the mold portion 304 may be at least partially surrounded by the sidewalls of the lower mold 302. During operation, the mold portion 304 may be at least partially engaged with the sidewalls of the lower mold 302. The mold portion 304 may include a base 305 and a protrusion 306 extending upward (i.e., toward the upper mold 301) from the base 305. The protrusion 306 of the mold portion 304 may terminate at a tip portion 307. The protrusion 306 may have a linear shape of a vertical wall in a plan view (e.g., when viewed from the upper mold 301). The cross-section of the protrusion 306 may be as shown in FIG. Figure 1 As shown, any other suitable shape is contemplated, as discussed in detail below.

[0009] The lower mold 302 may include an upper surface 303, which may also be referred to as a support surface 303. The upper surface 303 may be a flat surface to support the initially flat bag film. The portion of the lower mold 302 including its upper surface 303 may also be referred to as an anvil 303. The lower mold 302 may include a gap 308 disposed at the upper surface 303 to allow a portion of the protruding portion 306 of the peak 307 and the mold portion 304 to protrude therefrom. The gap 308 may have the shape of a linear slit in a plan view. The lower mold 302 may be shaped to provide a hollow space H below the upper surface 303. The mold portion 304 may be at least partially arranged in the hollow space H. For example, during operation, the movement of the mold portion 304 in the upward direction may be limited by the lower surface (rear surface) of the anvil 303. Of course, the upward movement of the mold portion 304 may stop before reaching the lower surface of the anvil 303.

[0010] The apparatus 300 may also include a punch 309 and an ejector portion 310. The punch 309 and / or the ejector portion 310 may be operably coupled to the upper die 301. The punch 309 may have a shape that is shaped according to the cup portion 1005 to be formed in the bag (see also Figure 2; also referred to herein as a cup or recessed cup). In particular, the punch 309 can be configured to provide two or more (three, four or more) cup portions in the bag. For example, the punch 309 can include one or more large-scale body portions, each body portion corresponding to the shape and size of a corresponding cup portion to be formed in the bag. The bridge portion 1006 is retained between the two cup portions 1005. The bridge portion 1006 is formed by the protrusion 306 of the mold portion 304.

[0011] For example, the ejector portion 310 and / or the punch 309 may be operable to move relative to the upper die 301. The punch 309 may be operable to move relative to the anvil 303 (ie, toward and / or away from the anvil 303). The operation (movement) of the punch 309 may be as follows: Figure 1 Additionally or alternatively, the mold portion 304 may be operable to move relative to the upper mold 301 (ie, toward and / or away from the upper mold 301). The operation (movement) of the mold portion 304 may be as follows: Figure 1 As shown by the arrow D.

[0012] During operation of the apparatus 300 and / or in a corresponding method of forming a bag, a bag film (initially flat bag film) 1000 can be placed on the upper surface 303 of the lower mold 302. The mold portion 304 can be moved upward (e.g., raised toward the upper mold 301) so that the tip portion 307 and a portion of the protrusion 306 protrude upward through the gap 308 and thus expand the corresponding portion of the bag film 1000. In some examples, the mold portion 304 can be moved so that (until) the tip portion 307 abuts against the stripper plate 310. Specifically, the protrusion 306 can extend between the punches 309 and can engage the stripper portion 310. Typically, the tip portion 307 of the protrusion 306 has a substantially semicircular cross-sectional shape, thereby forming a bridge portion 1006 with a corresponding semicircular tip.

[0013] The punch 309 can be moved downward (lowered, for example, toward the lower mold 302) to press against the bag film 1000. Therefore, the initially flat bag film 1000 can be stretched (stretched) according to the shapes of the mold tip portion 307, the protrusion 306 and the punch 309. Specifically, a cup portion can be formed in the bag according to the shape of the punch 309. A bridging portion can be formed in the bag between two cup portions according to the shapes of the protrusion 306 and the tip portion 307 in combination with the punch 309. The movement of the mold portion 304 and the punch 309 can be performed simultaneously or subsequently. Therefore, a bag 1002 having at least two cup portions 1005 and a bridging portion 1006 therebetween can be formed by pressing an initially flat bag film 1000, see also Figures 2 to 4 .

[0014] To release the bag from the apparatus 300, the punch 309 can be moved upward (i.e., away from the lower die 302), and the die portion can be moved downward (i.e., away from the upper die 301). The ejector portion 310 can be moved to facilitate removal of the bag from the apparatus 300, particularly by reducing the contact area between the portion of the apparatus 300 and the bag. For example, the ejector portion 310 can move with the punch 309 (upward and / or downward). Alternatively, the ejector portion 310 can move upward after a short delay after moving the punch 309 upward. Further alternatively, the ejector portion 310 can first move downward and then upward.

[0015] Bag film 1000 can be provided as (initially) flat sheet. Bag film 1000 can be plastically pressed and formed in the manner described herein. Bag film 1000 can have a laminated structure including, for example, a metal film and one or more synthetic material layers. For example, the metal film can be made of aluminum (Al), iron (Fe), copper (Cu), chromium (Cr), manganese (Mn), nickel (Ni), magnesium (Mg), zinc (Zn) or a combination or alloy thereof. For example, each of a synthetic material layer or synthetic material layers can be made of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester fiber, polyphenylene, benzobisoxazole, polyarylate, Teflon, glass fiber or a combination thereof or include them.

[0016] As discussed in detail below, the protrusion 306 is used to form a bridge portion between the two cup portions of the bag. Therefore, the protrusion 306 may be referred to as a partition wall 306 hereinafter. Moreover, the tip portion 307 of the mold portion 304 may be configured and specifically formed and shaped to design the upper portion of the bridge portion of the bag film. The tip portion 307 may be referred to as a peak 307 hereinafter. In addition, the terms cup, recessed cup, and cup portion may be used interchangeably unless otherwise specified or technically inappropriate.

[0017] Thereafter, an electrode assembly (also referred to as an electrode stack) 1010 is housed in one of the cup portions 1005. The electrode assembly may include layers of positive electrodes, negative electrodes, and separators stacked one on top of the other in an alternating and repeating manner. Subsequently, the membrane 1000 is folded around the bridging portion 1006 so that the cups 1005 face each other, thereby forming a bag 1002 ( Figure 3 ). In order to close the pouch type secondary battery 1001, the areas of the side portions 1003 of the sheet surrounding the periphery of the opposing cup 1005 are attached to each other along the sealing portion 1004 ( Figure 4 ).

[0018] Ideally, the bridging portion 1006 can be fully unfolded during the folding of the bag film 1000, so that the resulting bag 1005 has a substantially flat side wall (not shown) where the bridging portion 1006 is located. However, due to the rigidity of the material of the bag film 1000, the bridging portion 1006 may not be fully unfolded. Therefore, a portion of the bridging portion 1006 may remain after folding the bag film 1000 that protrudes (extends) inwardly, such as Figure 3 As shown. This remaining portion of the bridging portion 1006 may contact and even deform the electrode assembly contained in the pouch 1005. This may cause damage to the electrode assembly and a short circuit, which may lead to defects, malfunctions, and / or safety issues of the battery.

[0019] In addition, due to the height difference P between the area around the cup 1005 including at least a portion of the sealing portion 1004 (which has not been subjected to the forming and pressing process) including the side portion 1003 on the one hand and the cup 1005 that has been subjected to the forming process on the other hand, a so-called bat-ear 1007 may appear when the bag is folded. Such a bat-ear 1007 is a portion that unnecessarily protrudes and warps the exterior of the battery case, resulting in an increase in dead space that does not contribute to the capacity of the secondary battery. As a result, the energy density of the secondary battery is reduced. Moreover, the battery ear 1007 leads to inaccurate measurement of the full width of the cell, causing a risk of cracks, and complicating the assembly of the battery module. Summary of the invention

[0020] Technical issues

[0021] An object of the present disclosure is to overcome the problems of the prior art, and in particular to provide a pouch-type battery case, a secondary battery, and a battery forming apparatus that prevent undesirable and potentially harmful deformation of a pouch film.

[0022] However, the problems to be solved by the embodiments of the present disclosure are not limited to the above-mentioned problems, and various extensions can be made within the scope of the technical concept included in the present disclosure.

[0023] Technical Solution

[0024] The subject matter according to the independent claims solves one or more problems known from the prior art. Detailed description of the invention is given by the features of the dependent claims.

[0025] It should be noted that, as mentioned above Figure 1 , Figure 2 and Figure 4 Some of the features and operations of the described systems and methods for press-forming a bag may also be employed in the claimed subject matter and may not be repeated below for the sake of brevity of description.

[0026] The present disclosure relates to a pouch-type battery case, which is configured to accommodate an electrode assembly having a structure in which electrodes and separators are alternately arranged. Such an electrode assembly may be referred to as an electrode assembly. The pouch-type battery case according to the present disclosure includes a pouch film, a first cup portion, a second cup portion, and a bridging portion.

[0027] The bag film has a film thickness. The film thickness is preferably constant and / or continuous in the transverse film direction. The film thickness is preferably constant and / or continuous in the longitudinal film direction. The bag film has a first surface and a second surface, the first surface is particularly configured to be used as an inner surface of the bag-type battery housing, and the second surface is particularly configured to be used as an outer surface of the bag-type battery housing. The first surface can be engaged with the placed electrode assembly so as to be placed in the bag-type battery housing. The second surface can be facing away from the electrode assembly and optionally engaged with the environment surrounding the secondary battery.

[0028] The bag film may define a longitudinal film direction and a transverse film direction. The bag film may be meshed before being formed into a bag-type battery housing, thereby defining an extension of a substantially plane having a longitudinal film direction and a transverse film direction arranged perpendicular to the longitudinal film direction, and the longitudinal film direction may correspond to the direction of conveying the bag film in the forming device. The extension of the bag film in the mesh direction or the longitudinal film direction may be substantially greater than the extension in the transverse film direction. For example, the extension in the transverse film direction may be between 10 mm and 500 mm, for example, between 50 mm and 100 mm, and the extension of the bag film in the longitudinal direction may be greater. In the longitudinal direction, the bag film may be designed to be divided into separate parts to form a mesh or "ring-shaped" extension before being fixed as a bag-type secondary battery. The film thickness extends perpendicular to the longitudinal film direction and the transverse film direction. The film thickness may be at least 100 times smaller than the smaller of the extension of the bag film in the transverse film direction or the longitudinal film direction, in particular at least 1000 times.

[0029] A first cup portion is formed in the bag film, which has a concave shape offset from the first surface toward the second surface. A second cup portion is formed in the bag film, which has a concave shape offset from the first surface toward the second surface. Simply put, when the bag film is formed into a bag using a deep drawing device or the like (for example, as described below), the bag film can be arranged between the punch and the die so that the downward movement of the punch relative to the die forms a cup portion protruding downward. It should be clear that the term "downward" used herein should be understood to generally refer to a first direction. The first direction is a direction in which a relative movement of the punch relative to the die is performed for deep drawing the bag film to form a cup portion, wherein either the die can be stationary and the punch moves downward, or the punch can be stationary and the die moves upward (in a second direction opposite to the first direction), or the die can move toward the punch in the second direction and the punch can move toward the die in the first direction.

[0030] The bridging portion is formed in the bag film between the first cup portion and the second cup portion. The bridging portion connects the first cup portion to the second cup portion. Preferably, the bridging portion is arranged between the first cup portion and the second cup portion in the transverse film direction. The bridging portion preferably extends in the transverse film direction. The first cup portion and the second cup portion optionally have substantially the same size and shape. The first cup portion has a first cup depth, and the second cup portion has a second cup depth. The first cup depth and / or the second cup depth are preferably greater than the film thickness. The first cup depth and / or the second cup depth are preferably at least 10 times, particularly at least 100 times, of the film thickness. The extension of the bag film in the transverse film direction may be at least 5 times, particularly at least 10 times, and preferably at least 20 times, of the first cup depth and / or the second cup depth. The first cup depth and / or the second cup depth are preferably suitable for the height of the electrode assembly. In particular, the first cup portion is configured to receive the first part of the electrode assembly that is housed or to be housed in the battery housing. The first part of the electrode assembly may be at least a quarter, at least a third, or at least a half of the electrode stack forming the electrode assembly. Alternatively or additionally, the second cup portion is configured to receive a second portion of an electrode assembly that is or will be contained in a battery housing. The second portion of the electrode assembly may be at least a quarter, at least a third, or at least a half of the electrode stack that forms the electrode assembly. The first cup portion and the second cup portion may preferably be arranged in a symmetrical manner relative to each other, wherein the bridging portion is between the first cup portion and the second cup portion. It may be preferred that the length of the bridging portion in the transverse film direction (bridging portion length) corresponds to the length of the first cup and / or the second cup in the transverse film direction. It may be preferred that the bridging portion terminates in the first side portion in the transverse direction on one side and terminates in the second side portion of the bag film on the opposite side.

[0031] According to a first aspect of the pouch-type battery housing of the present disclosure, the bridging portion includes a notch formed in the first surface and protruding toward the second surface. The bridging portion and / or the notch may be curved. The curvature of the notch is preferably opposite to the curvature of the bridging portion. It may be preferred that the bag film is continuously bent from the first cup portion to the second cup portion, wherein the curvature of the notch is bent in a direction opposite to the curvature of the remaining bridging portion. The notch may be configured to extend continuously in the transverse film direction. The notch may have a notch length corresponding to the length of the bridging portion. The notch length may in particular extend continuously from a first side portion of the battery housing adjacent to the first cup portion and / or the second cup portion to a second side portion of the battery housing adjacent to the first cup portion and / or the second cup portion, wherein the first side portion and the second side portion are arranged opposite to each other in the transverse film direction.

[0032] Advantageously, when the first cup portion and the second cup portion are folded over each other, the notch can act in a hinge-like manner to form a bag for accommodating a battery assembly. By providing a bridging portion with a notch, a more clearly defined pouch-type secondary battery can be formed compared to prior art designs. The provision of the notch prevents the peak of the bridging portion from colliding with the electrode assembly, thereby reducing the risk of deforming and / or damaging the negative electrode, the positive electrode and the separator. In addition, it has been found that providing the notch in the bridging portion results in a significant reduction in the formation of bat ears. Therefore, the energy density can be increased, the dimensional stability of the battery can be improved, the risk of rupture can be prevented, and the assembly of the battery module can be facilitated.

[0033] In an embodiment of the pouch-type battery housing, the notch has a notch depth less than the film thickness, in particular a notch depth less than half the film thickness. The notch depth may be at least one-tenth of the film thickness, preferably at least one-quarter of the film thickness. The notch depth may be at least 10 μm, in particular at least 25 μm, preferably at least 50 μm, more preferably at least 100 μm. Alternatively or additionally, the notch depth may be not more than 200 μm, in particular not more than 180 μm, preferably not more than 150 μm. Preferably, the notch depth is constant for at least 50% of the length of the notch in the transverse film direction, in particular for at least 75% of the length of the notch, preferably for at least 90% of the length of the notch or at least 95% of the length of the notch. By providing a notch with such a depth, the pouch-type battery housing can be provided with improved folding properties while maintaining the structural integrity of the pouch film in the region of the bridging portion. On the other hand, notch depths that extend significantly beyond the film thickness have been shown to indicate cracking or other weakening of the pouch film, which may result in reduced durability of the battery casing.

[0034] In another embodiment of the pouch-type battery case that can be combined with the above-described pouch-type battery case, the notch has a notch width extending in the longitudinal film direction between two vertices of the pouch film adjacent to the notch. The vertices may be at the level of the peaks of the inner surface of the bridging portion. Alternatively or additionally, the vertices may be at the level of the inner surface surrounding the cup portion, in particular at the level of the plane defined by the side portions.

[0035] The notch width is at least half of the film thickness, in particular at least one time. Alternatively or additionally, the notch width is not more than three times the film thickness, in particular not more than two times. The notch depth may be at least 50 μm, in particular at least 100 μm, preferably at least 250 μm. Alternatively or additionally, the notch depth may be not more than 2 mm, in particular not more than 1.5 mm, preferably not more than 1 mm. Preferably, the notch width is constant for at least 30% or at least 50% of the notch length in the transverse film direction, in particular for at least 75% of the length, preferably for at least 90% of the length or at least 95% of the notch length.

[0036] In another embodiment of the pouch-type battery housing that can be combined with the above-mentioned pouch-type battery housing, the bridging portion defines a bridging portion width extending from the first cup portion to the second cup portion. The bridging portion width corresponds to the distance from the first cup portion to the second cup portion. The bridging portion width is preferably constant in the transverse direction. The bridging portion width is preferably defined by the distance from the inner surface of the first peripheral portion of the first cup portion to the inner surface of the first peripheral portion of the second cup portion. After forming (or: stretching (drawing)) and before folding, the first peripheral portions of the first cup portion and the second cup portion form relative legs of the bridging portion with outer surfaces facing each other. In particular, the bridging portion width is at least four times the thickness of the film, preferably at least six times. Alternatively or additionally, the bridging portion width may be no more than 20 times the thickness of the film, in particular no more than 10 times the thickness of the film. In particular, the radius of curvature of the notch is at least as large as the radius of curvature of the vertex of the bridging portion adjacent to the notch, preferably greater than the radius of curvature. The bridge width may be at least 0.5 mm, in particular at least 0.75 mm, preferably at least 1 mm, and / or not more than 5 mm, in particular not more than 2 mm, preferably not more than 1.5 mm. By adapting the bridge width and the notch width to each other as described above, the folding deformation may be controlled such that undesirable wrinkling, bat ear formation or protrusion formation which may cause a risk of collision with an electrode assembly housed therein may be minimized.

[0037] According to an embodiment of the pouch-type battery housing that can be combined with the above-mentioned pouch-type battery housing, the bridging portion (including the notch) has an M-shaped cross-section in the longitudinal film direction. The M-shaped cross-section of the bridging portion is preferably constant and / or continuous along the length of the bridging portion in the transverse film direction. The M-shape of the bridging portion can continue for at least 50% of the length of the notch in the transverse film direction, in particular for at least 75% of the length, preferably for at least 90% of the length or for at least 95% of the length of the bridging portion.

[0038] According to the first aspect of the present disclosure and possibly one or more of the above-mentioned embodiments thereof and / or according to the second aspect of the present disclosure described below and possibly one or more of the embodiments thereof, the bag film thickness of the bag film is 100 μm to 250 μm, in particular 160 μm to 200 μm, preferably 175 μm to 190 μm. Preferably, the bag film includes a gas barrier layer made of metal. The metal of the gas barrier layer of the bag film preferably contains aluminum and / or an alloy containing aluminum or is composed of aluminum and / or an alloy containing aluminum, in particular including an alloy number AA80XX series aluminum alloy. The alloy number of the aluminum alloy may be AA8021. The aluminum alloy may include about 1.3 wt% to about 1.7 wt% of iron and about 0.2 wt% or less of silicon, and may have a grain size of about 10 μm to about 13 μm. The thickness of the gas barrier layer can be 30μm to 150μm, in particular 70μm to 120μm, preferably 80μm to 100μm. The bag film may also include a sealant layer made of a first polymer, preferably formed as the innermost layer. The thickness of the sealant layer may be 60μm to 100μm. Additionally or additionally, the bag film may include a surface protection layer made of a second polymer, preferably formed as the outermost layer. The first polymer may be the same as or different from the second polymer. In particular, the gas barrier layer is stacked between the surface protection layer and the sealant layer. The bag film may also include a stretching auxiliary layer made of a third polymer. The third polymer may be the same as or different from the first polymer and / or the second polymer. The stretching auxiliary layer may be stacked between the surface protection layer and the gas barrier layer. The thickness of the stretching auxiliary layer may be 10μm to 75μm, specifically 20μm to 50μm.

[0039] The first polymer can be made of one or more materials selected from the group including the following items: polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acryl polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, poly-p-benzobisoxazole, polyarylate, Teflon and glass fiber. In particular, polyolefin-based resins such as polypropylene (PP) or polyethylene (PE) can be the main component in the first polymer. Polypropylene (PP) can provide excellent mechanical properties (including tensile strength, rigidity, surface hardness, wear resistance and heat resistance) and excellent chemical properties (including corrosion resistance), and is therefore selected as the main component of the sealant layer.

[0040] The second polymer may be made of one or more of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acryl polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, polybenzobisoxazole, polyarylate, Teflon, and glass fiber. It may be advantageous to primarily use polymers having desired wear resistance and heat resistance, such as polyethylene terephthalate (PET).

[0041] The third polymer can be made of one or more of polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acryl polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, nylon, polyester, poly-p-benzobisoxazole, polyarylate, Teflon and glass fiber. In particular, nylon resin can be easily bonded to the polyethylene terephthalate (PET) of the surface protection layer, and can exhibit similar behavior to the aluminum alloy of the moisture barrier layer during and after the stretching process. Therefore, nylon resin can be used as the main component of the third polymer.

[0042] In a second aspect of the present disclosure, the present disclosure relates to a pouch-type battery case configured to accommodate an electrode assembly having a structure in which electrodes and separators are alternately arranged. Such an electrode assembly may be referred to as an electrode assembly. The pouch-type battery case according to the present disclosure includes a pouch film, a first cup portion, a second cup portion, and a bridging portion.

[0043] According to the second aspect of the present disclosure, which can be combined with the first aspect of the present disclosure and optionally at least one or more of its embodiments, the bridging portion that separates the first cup portion from the second cup portion in the longitudinal film direction and extends in the transverse film direction includes a central bridging section arranged between the two side bridging sections in the transverse film direction, wherein the central bridging section is offset from the side bridging section toward the second surface. It may be preferred that the length of the bridging portion (bridging portion length) corresponds to the length of the first cup and / or the second cup in the transverse film direction in the transverse film direction. It may be preferred that the bridging portion terminates in the first side portion in the transverse direction on one side and terminates in the second side portion of the bag film on the opposite side. The cup portion adjacent to the bridging portion has a corresponding cup depth. The cup depth of the first cup portion is preferably equal to the cup depth of the second cup portion. The cup depth of each cup portion (preferably a constant cup depth) is defined by the engagement depth of the punch into the die. The offset from the side bridging section to the central bridging section can be at least 50 μm, in particular at least 100 μm, preferably at least 150 μm, and / or not more than 500 μm, in particular not more than 300 μm, preferably not more than 250 μm. The offset from the side bridging section to the central bridging section can be at least 0.5 times the thickness of the bag film, in particular at least 0.75 times, preferably at least 1 times, and / or not more than 2 times, in particular not more than 1.5 times, preferably not more than 1.25 times. By providing an offset between the lateral portions in the central section of the bridging portion, the formation of undesirable bat ears can be greatly reduced. Moreover, the provision of a downwardly offset central bridging section shows a significant reduction in the collision between the folded bridging portion and the electrode assembly arranged in the battery bag.

[0044] In an embodiment of the second aspect of the pouch-type battery housing, the side bridging section is on the same horizontal plane as the inner surface of the surrounding cup portion, in particular on the horizontal plane of the plane defined by the inner surface surrounding the first cup portion and / or the second cup portion, in particular on the side portion arranged adjacent to the cup portion in the lateral direction.

[0045] In another embodiment of the second aspect of the pouch-type battery housing, the central section has a first length and the side sections each have a second length. The first side section and the second side section may have the same second length. In particular, the horizontal plane of the side section is constant along the second length. Alternatively or additionally, along the first length, the horizontal plane of the central bridging section is constant. The first length is preferably greater than the second length. In particular, the first length may be at least 10 mm, in particular at least 20 mm, preferably at least 50 mm, and / or not more than 200 mm, in particular not more than 150 mm, preferably not more than 100 mm. In particular, the first length is at least twice the second length. In particular, the second length may be at least 2 mm, in particular at least 5 mm, preferably at least 7 mm, and / or not more than 20 mm, in particular not more than 15 mm, preferably not more than 12 mm.

[0046] According to another embodiment of the second aspect of the pouch-type battery housing, which can be combined with the aforementioned pouch-type battery housing, the bridging portion further includes an inclined section connecting the central section and the side section. The first inclined section may be arranged between the first side bridging section and the central bridging section, and the second inclined section may be arranged between the central bridging section and the second side bridging section. The inclined section gradually changes the horizontal plane of the bridging portion from the central bridging section to the elevated horizontal plane of the side bridging section. The inclined section may have a linear inclination that is particularly continuous and constant, and / or may be at least partially or continuously formed into an arc slope. The lengths of the inclined sections are preferably equal. The length of the inclined section is preferably less than the length of the central bridging section. The length of the inclined section (the third length) may be as large or smaller than the length of the side bridging section. In particular, the third length may be at least 1 mm, in particular at least 3 mm, preferably at least 5 mm, and / or not more than 12 mm, in particular not more than 10 mm, preferably not more than 8 mm. By providing such an inclination between the side bridging sections that are offset and thus raised above the central bridging section, undesirable wrinkling or other deformations that may be hard-controlled during folding of the pouch film can be minimized or even completely avoided. Surprisingly, when both the first and second aspects of the present disclosure are implemented in a pouch-type battery housing, a significant improvement in deformation control with respect to folding is perceived.

[0047] According to a third aspect of the present disclosure, a secondary battery is provided, the secondary battery comprising a battery housing according to at least one of the first aspect and / or the second aspect of the present disclosure and its optional embodiments. In the secondary battery, the first cup portion and the second cup portion are placed directly opposite each other to form a bag. In addition, the electrode assembly is contained in the bag. Preferably, the secondary battery is formed by folding the bag film around the notch in the bridging portion. In the secondary battery, the side portion adjacent to the first cup portion on the one hand and the side portion adjacent to the second cup portion on the other hand are engaged with each other and preferably attached to each other in a sealed manner. In addition, the sealing portions of the bag films respectively adjacent to the first cup portion or the second cup portion and arranged opposite to the cup portion and the bridging portion are engaged with each other and preferably attached to each other in a sealed manner. The first peripheral portions of the first cup portion and the second cup portion (facing each other before the bag film is folded around the bridging portion) can form a substantially flat bottom surface of the pouch-type secondary battery.

[0048] The bag as the shell of the pouch-type secondary battery can be manufactured by forming two cup parts on a flexible bag film by a pressing process. Then, after the cup parts have been formed, the electrode assembly is accommodated in the accommodation space of one of the cup parts and its side is sealed. In this way, a secondary battery is manufactured.

[0049] As an example of a press forming process, stretch forming can be performed in the following manner: insert the bag 1m into a forming device (such as a press described below); and press and stretch the bag film by a punch and / or a die. The bag film is made of multiple layers, and the moisture barrier layer positioned as the inner layer is formed of metal.

[0050] The present disclosure also relates to a battery case forming apparatus for manufacturing a pouch-type battery case as described above, preferably according to the first aspect of the present disclosure. The battery case forming apparatus includes a die, a punch, and a demolding device portion.

[0051] The mold has a top surface and a partition wall, the bag film is to be placed on the top surface, and the bag film includes two forming spaces recessed from the top surface, and the partition wall separates the forming spaces. The forming spaces are preferably suitable for forming the first cup part and the second cup part.

[0052] The punch is disposed above the forming space. The punch includes two punch pads. In particular, the first punch pad corresponds to the first forming space for forming the first cup portion, and the second punch pad corresponds to the second forming space for forming the second cup portion. The punch is operable to lower the punch pad so as to insert the bag film placed on the top surface into the forming space.

[0053] The mold may preferably be configured so that the portion of the bag film placed in the protruding area forming the space will be deflected by the punch to form the cup portion. In addition, the mold may be configured so that the portion of the bag film placed on top of the solid section of the mold top surface (adjacent to the protruding area forming the space and the partition wall) will form the side portion and / or the sealing portion, and / or it may preferably be maintained at the first horizontal plane.

[0054] The demoulder part cooperates with the punch and is arranged between the punch pads. Preferably, the demoulder part is arranged opposite to the partition wall. The demoulder part is preferably configured to cooperate with the partition wall to form a bridge portion for the pouch-type battery housing to the pouch film.

[0055] According to a third aspect of the present disclosure, the demolding device portion includes a protrusion configured to form a recess into the bag film, and the partition wall includes a fold opposite to the protrusion for receiving a portion of the bag film (in particular, a portion of the bag film displaced by the protrusion). The fold and the protrusion are preferably formed complementary. When the punch is lowered into the die, the die and the punch are preferably suitable for accommodating the bag film therebetween. Additionally or alternatively, when the punch is lowered into the die, the protrusion and the fold are suitable for accommodating the bag film therebetween. When the punch is lowered into the die, the die and the punch may be adapted to each other to maintain a distance corresponding to the thickness of the bag film to be formed. Alternatively or additionally, when the punch is lowered into the die, the demolding device portion including the protrusion and the die including the fold may be adapted to each other to maintain a distance corresponding to the thickness of the bag film to be formed.

[0056] In a further development of the battery housing forming device according to the third aspect of the present disclosure, the protrusion has a protrusion height, wherein the protrusion height is less than the film thickness of the bag film to be formed. In particular, the protrusion height is less than half of the film thickness or at least one tenth of the film thickness. Alternatively or additionally, the crease has a crease depth, wherein the crease depth is less than the film thickness of the bag film to be formed. In particular, the crease depth is less than half of the film thickness or at least one tenth of the film thickness. The crease depth corresponds to and is preferably equal to the protrusion height.

[0057] According to an embodiment of the battery housing forming device that can be combined with the previous one, the fold defines the fold width extending between adjacent shoulders of the partition wall. The partition wall has a wall thickness defined between two forming spaces. The wall thickness is at least 1.1 times the fold width, in particular at least 1.25 times the fold width. Alternatively or additionally, the wall thickness is not more than 2 times the fold width, in particular not more than 1.5 times the fold width. In particular, the wall thickness is greater than the film thickness of the bag film to be formed. Preferably, the wall thickness is at least 2 times the film thickness, preferably at least 4 times. Alternatively or additionally, the wall film thickness is not more than 10 times the thickness of the bag film to be stretched in the device, in particular not more than 6 times the film thickness of the bag film to be stretched in the device. The wall thickness can be at least 0.3mm, in particular at least 0.5mm, preferably at least 0.75mm, and / or not more than 4mm, in particular not more than 1.5mm, preferably not more than 1.25mm.

[0058] In another embodiment of a battery case forming device that can be combined with the aforementioned battery case forming device, the protrusion has a protrusion width between adjacent planar sides of the stripper portion. The protrusion width is greater than the protrusion height. In particular, the protrusion width is at least 1.25 times the protrusion height, preferably at least 1.5 times the protrusion height. Alternatively or additionally, the protrusion width is not more than 3 times the protrusion height, preferably not more than 2 times. Preferably, the protrusion has a cosine-shaped cross section.

[0059] The present disclosure also relates to a battery case forming apparatus for manufacturing a pouch-type battery case, in particular as described above (preferably according to the second aspect of the present disclosure). The battery case forming apparatus comprises a die, a punch and a demolding device portion.

[0060] The mold has a top surface on which the bag film is to be placed, and the mold includes two forming spaces recessed from the top surface and a partition wall separating the forming spaces. The forming spaces are preferably suitable for forming a first cup portion and a second cup portion.

[0061] The punch is disposed above the forming space. The punch includes two punch pads. In particular, the first punch pad corresponds to the first forming space for forming the first cup portion, and the second punch pad corresponds to the second forming space for forming the second cup portion. The punch is operable to lower the punch pad so as to insert the bag film placed on the top surface into the forming space.

[0062] The mold may preferably be configured so that the portion of the bag film placed in the protruding area forming the space will be deflected by the punch to form the cup portion. In addition, the mold may be configured so that the portion of the bag film placed on top of the solid section of the mold top surface (adjacent to the protruding area forming the space and the partition wall) will form the side portion and / or the sealing portion, and / or it may preferably be maintained at the first horizontal plane.

[0063] The demoulder part cooperates with the punch and is arranged between the punch pads. Preferably, the demoulder part is arranged opposite to the partition wall. The demoulder part is preferably configured to cooperate with the partition wall to form a bridge portion for the pouch-type battery housing to the pouch film.

[0064] According to a fourth aspect of the present disclosure, which can be combined with the third aspect and embodiments thereof, the partition wall is arranged between the forming spaces in the transverse direction. The partition wall includes a central wall section arranged between two side wall sections in the transverse direction. The central wall section is offset relative to the side wall section in the direction in which the punch pad descends. The offset from the side wall section to the central wall section may be at least 50 μm, in particular at least 100 μm, preferably at least 150 μm, and / or not more than 500 μm, in particular not more than 300 μm, preferably not more than 250 μm. The offset from the side wall section to the central wall section may be at least 0.5 times, in particular at least 0.75 times, preferably at least 1 times, and / or not more than 2 times, in particular not more than 1.5 times, preferably not more than 1.25 times, of the bag film thickness of the bag film to be stretched in the device.

[0065] According to an embodiment of the fourth aspect, the stripper portion and / or the punch has a lug portion. The lug portion is preferably shaped to be complementary to the partition wall. The lug portion is arranged between the punch pads. The lug portion includes a central lug segment arranged in a transverse direction between the transverse lug segments, wherein the central lug segment protrudes so as to be introduced into the retraction of the mold provided by the central wall segment.

[0066] Beneficial Effects

[0067] According to the embodiments, a more defined pouch-type secondary battery can be formed compared to the prior art design, and the collision of the bridge portion with the electrode assembly can be avoided, thereby reducing the risk of deformation and / or damage to the negative electrode, the positive electrode, and the separator. In addition, according to the embodiments, a significant reduction in bat ear formation can be achieved. Therefore, the energy density can be increased, the dimensional stability of the battery can be improved, the risk of cracks can be prevented, and the assembly of the battery module can be facilitated.

[0068] The effects of the present disclosure are not limited to the above-described effects, and additional other effects not described above will be clearly understood by those skilled in the art from the description of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 is a schematic cross-sectional view of an apparatus for forming a secondary battery.

[0070] Figure 2 is a schematic side view of a battery case for a pouch-type secondary battery.

[0071] Figure 3 is a schematic cross-sectional view of a pouch-type secondary battery.

[0072] Figure 4 is another view of a pouch-type secondary battery.

[0073] Figure 5 is a schematic exploded view of a battery case and an electrode assembly for a pouch-type secondary battery according to an example.

[0074] Figure 6 is a schematic cross-sectional view of a battery case in which an electrode assembly is accommodated according to an example.

[0075] Figure 7 is a schematic side view of a battery case for a pouch-type secondary battery according to an example.

[0076] Figure 8 is a schematic cross-sectional view of a pouch-type secondary battery according to an example.

[0077] Fig. 9 is a schematic detailed view of a bridge portion of a pouch-type secondary battery between a partition wall and a stripper portion of an apparatus according to an example.

[0078] Fig.10 is another schematic cross-sectional view of a pouch-type secondary battery according to an example.

[0079] Fig.11 is a schematic cross-sectional view of an apparatus for forming a secondary battery according to an example.

[0080] Fig.12 is another schematic detailed view of a bridge portion of a pouch-type secondary battery between a partition wall and a stripper portion of an apparatus according to an example.

[0081] Fig.13 is a detailed view of the engagement between a dividing wall and a bag film in a device according to an example.

[0082] Fig.14 is a detailed view of the engagement between the stripper portion and the bag film in an apparatus according to an example. DETAILED DESCRIPTION

[0083] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily perform various embodiments of the present disclosure. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0084] In order to clearly describe the present disclosure, parts irrelevant to the description will be omitted, and like reference numerals designate like elements throughout the specification.

[0085] In addition, in the drawings, for the convenience of description, the size and thickness of each element are arbitrarily shown, and the present disclosure is not necessarily limited to the size and thickness shown in the drawings. In the drawings, for the sake of clarity, the thickness of layers, regions, etc. are exaggerated. In the drawings, for the convenience of description, the thickness of some layers and regions is exaggerated.

[0086] In addition, it should be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "above" another element, it can be directly on the other element, or there can be intervening elements. Conversely, when an element is referred to as being "directly on" another element, this means that there are no other intervening elements. In addition, the words "on..." or "above..." mean to be disposed on or below a reference portion, and do not necessarily mean to be disposed on the upper end of the reference portion in the opposite direction of gravity. At the same time, similar to the case where it is described as being located "on" or "above" another portion, the case where it is described as being located "below" or "below" another portion will also be understood with reference to the above.

[0087] Furthermore, throughout the specification, when a part is referred to as “including” or “comprising” a certain component, it means that the part may further include other components, without excluding the other components, unless otherwise specified.

[0088] Furthermore, throughout the specification, when referred to as “plane”, this means when the target portion is viewed from the upper side, and when referred to as “cross section”, this means when the target portion is viewed from one side of a cross section cut vertically.

[0089] Hereinafter, a battery case, a pouch-type secondary battery, and a device are described with reference to the accompanying drawings. Figures 1 to 4 Shown and referenced in Figures 1 to 4 The examples described are intended to illustrate the general apparatus and the general method of manufacture, but it should be noted that unless technically inappropriate, the above referenced Figures 1 to 4 Some features and operations of the system and method for pressing to form a bag described may also be implemented in the embodiment. For the sake of brevity of description, such features and operations may not be explicitly repeated below.

[0090] A pouch-type battery according to the present disclosure is generally indicated by reference numeral 10. A battery housing for such a pouch-type battery assembly is generally indicated by reference numeral 11. An apparatus for forming a pouch-type battery according to the present disclosure is generally indicated by reference numeral 100.

[0091] Figure 5 The exploded view of the battery 10 is shown. The battery 10 may be a secondary battery, in particular, a pouch-type secondary battery. The battery 10 includes a battery case 11 . Figure 5 Also shown in FIG. 1 is an exemplary electrode assembly 21 to be accommodated in the battery case 11 . Figure 6 A schematic cross-sectional view of a battery case 11 containing an electrode assembly 21 is shown.

[0092] The battery housing 11 can be provided by, for example, Figures 1 to 4 The bag film 1 is formed by pressing in a similar manner to that described above. Figure 5 and Figure 6 In the embodiment, the battery case 11 includes a first case section 18, a second case section 19 and a bridging portion 14 formed therebetween. The first case section may include a first cup portion 13, which is recessed from the bag film 1 in the thickness direction. The first cup portion 13 may have a tray shape with a rectangular shape with rounded corners in a plan view (i.e., in the thickness direction). The second case section 19 may include a second cup portion 15, which is recessed from the bag film 1 in the thickness direction. The second cup portion 15 may have a tray shape with a rectangular shape with rounded corners in a plan view (i.e., in the thickness direction). The first case section 18 and the second case section 19 may be foldable or folded around the bridging portion 14. In particular, one of the first case section 18 and the second case section 19 may be folded onto the corresponding other case section 18, 19 so that the first cup portion 13 and the second cup portion 15 are close to each other. In this way, a bag for accommodating an electrode assembly 21 therein can be obtained.

[0093] The electrode assembly 21 includes electrodes 23, 25 each having a sheet-like shape. The electrode assembly 21 may be prepared by stacking the electrodes 23, 25 on top of each other in an alternating manner with the separator 24 interposed between the adjacent electrodes 23, 25.

[0094] like Figure 5As shown, the sheet electrodes 23, 25 have electrode tabs 22 protruding from the electrodes 23, 24 on opposite sides of the transverse direction X of the electrode assembly 21. For example, the first electrode tab 22 protrudes from the first side of the electrode assembly 21 and can be operably connected to the negative electrode (anode) 23, and the second electrode tab 22 protrudes from the second side of the electrode assembly 21 and can be operably connected to the positive electrode 25. The first side and the second side of the electrode assembly 21 can be opposite to each other or can refer to the same side of the electrode assembly 21 (not shown in the figure). The electrode tabs 22 are each provided with an insulating portion 26, which is configured to be arranged between the opposite side portions 16 of the battery case 11. The side portions 16 of the battery case 11 are attached to each other by folding the bag film 1 (i.e., in the assembled state of the battery 10) to provide a fluid-tight seal. Each electrode tab 22 terminates in a corresponding electrode lead 27 for electrical connection.

[0095] Bag film 1 can be as above reference Figures 1 to 4 In particular, the bag film 1 may include the above reference Figures 1 to 4 Any or all of the features described in the bag film 1000 in . The bag film 1 may include a metal layer, preferably made of aluminum or an aluminum alloy. Before undergoing the press forming as described herein, the bag film 1 may be substantially flat. In particular, the bag film 1 may have a laminated structure including a plurality of layers laminated together. The bag film 1 may preferably have a mesh shape. Before being processed into the electrode shell 11, the bag film 1 may have a constant and continuous film thickness d1 between 100 μm and 250 μm, or between 150 μm and 200 μm, preferably between 175 μm and 190 μm, or more preferably about 183 μm (e.g., 183 μm ± 10 μm). The film width in the transverse film direction X (or width direction X) may span from several centimeters to tens of centimeters, for example, 1 cm to 100 cm, or 2 cm to 50 cm, preferably 5 cm to 30 cm. The bag film 1 can extend significantly larger than the film width, particularly several meters or even more, in the mesh conveying direction Y or longitudinal direction Y. For example, the film length along the longitudinal direction Y can be 5cm to 500cm, or 10cm to 250cm, or preferably 15cm to 150cm.

[0096] The battery housing 11 is made of the pouch film 1 disclosed herein. The battery housing 11 comprises a first cup portion 13 and a second cup portion 15, which may preferably be manufactured by deep drawing in the apparatus 100 as described herein. The cup portions 13 and 15 may be formed adjacent to each other and separated by a bridge portion 14 therebetween.

[0097] The bag film 1 has a first surface 31 and a second surface 32 opposite to the first surface 31. For ease of reference, the first surface 31 may be referred to as the inner surface 31, and the second surface 32 may be referred to as the outer surface 32. Relative to the initial substantially flat shape of the bag film 1, the cup portion 13, the cup portion 15 (which may be formed by deep drawing and / or pressing) is offset from the first surface 31 in a direction toward the second surface 32, or in other words: is recessed (recessed) in a downward direction D, which may be parallel to the direction from the first surface 31 toward the second surface 32. In the following, referring to Fig.11 and Fig.12 In the described device 100 , the first surface 31 may be arranged above the second surface 32 and thus referred to as an upper membrane surface 31 and a lower membrane surface 32 .

[0098] When the cup portions 13, 15 are recessed, the bridge portion 14 remains elevated. The bridge portion 14 can be at least partially or completely maintained in the plane of the bag film 1 defined by the side portions 16 surrounding the cup portions 13, 15. In some embodiments, the peak of the bridge portion 14 is completely arranged in the plane defined by the side portions 16 adjacent to the cup portions 13, 15 in the transverse film direction X. In some embodiments, the peak of the bridge portion 14 can be divided into a plurality of segments, some of which can be optionally arranged on the same horizontal plane as the side portions 16, wherein at least some of the segments are offset in the (downward) direction from the first surface 31 toward the second surface 32. The offset s of the segment is less than the depth d of the first cup portion 13 and / or the second cup portion 15. 13 d 15 , as will be referred to below Fig.10 described.

[0099] In some embodiments, the peak of the bridge portion 14 is provided with a notch 41 formed in the bridge portion 14 for most or substantially all of its length in the transverse film direction X, as will be described below with reference to e.g. Fig. 9 describe.

[0100] To form the pouch-type battery 10, the battery housing 11 is folded onto itself between the cup portions 13 and 15 around the bridge portion 14, as shown in FIG. Figure 6 In the embodiment shown, the bridge portion 14 is provided with a notch 41 embossed into the first surface 31 of the film pocket. The notch 41 may provide a film joint around which a well-defined folding movement of the bag film may be performed.

[0101] As described above, the bag film 1 can be divided into a first shell section 18 (or: first bag section 18) and a second shell section 19 (or: second bag section 19). The first shell section 18 and the second shell section 19 can be symmetrical to each other relative to a plane passing through the bridging portion 14. The bridging portion 14 can divide the bag film 1 into two mirror-symmetrical shell sections 18 and 19. Each shell section 18 and 19 includes a corresponding cup section 13 and 15. In this document, the (battery) shell sections 18 and 19 may also be referred to as bag sections 18 and 19. The first cup section 13 and the second cup section 15 may have the same or substantially the same shape and size. Since the electrode assembly 21 has a roughly cubic shape, the accommodation space for the electrode assembly 21 provided by the first cup section 13 and the second cup section 15 has a shape corresponding to a rectangular parallelepiped electrode assembly. Therefore, the corresponding width w of the cup sections 13 and 15 in the transverse film direction X is 13 、w 15 Preferably, they have the same size. In addition, the respective lengths l of the first cup portion 13 and the second cup portion 15 in the longitudinal film direction Y are 13 , l 15 The cup portions 13, 15 may have the same dimensions. 13 、w 15 The first cup portion 13 or the second cup portion 15 has a length l, respectively, extending between mutually opposite side portions 16 of the housing along the transverse film direction axis. 13 , l 15 The first cup portion 13, 15 has a first depth d extending between mutually opposing perimeter portions 12. The perimeter portions 12 may connect the concave bottom of the cup portion 13, 15 to the bridging portion 14 and, on the other hand, to the sealing portion 17 of the respective housing section 18, 19. The perimeter portions 12 may generally be referred to as side walls of the cup portion 13, 15. The first depth d of the first cup portion 13 is 13 and a second depth d of the second cup portion 15 15 The sum of the first depth d may correspond to the (stacked) height h of the electrode assembly 21. As shown in the illustrated embodiment, the first depth d 13 and the second depth d 15 Alternatively, the first depth d 13 can be greater than the second depth d 15 .

[0102] Figure 7 A schematic cross-sectional side view of a battery housing 11 is shown. Figure 8 A schematic cross-sectional side view of a pouch-type secondary battery 10 is shown. The pouch-type secondary battery 10 includes Figure 7 The battery case 11 accommodating the electrode assembly 21 is shown in a folded state.

[0103] exist Figure 7 , a cross-section of a bag film 1 extending along a longitudinal film direction Y is shown. The bag film 1 is formed to include a first cup portion 13, a second cup portion 15 and a bridging portion 14 therebetween. In the longitudinal film direction Y, which may correspond to the direction of travel of the bag film 1 through the device 100, both the cup portion 13 and the cup portion 15 have corresponding adjacent degassing portions or sealing portions 17. Therefore, each cup portion 13 or 14 is arranged between the bridging portion and its corresponding sealing portion 17 along the longitudinal film direction Y. In the longitudinal film direction Y, the cup portions 13, 15 are both confined between opposite peripheral portions 12 (which may form the side walls of the corresponding cup portions 13, 15). The first peripheral portion 12 may form opposite legs of the bridging portion 14. The second peripheral portion 12 may connect the bottom of the cup portions 13, 15 to the sealing portion 17. The peripheral portion 12 may have a depth d of the corresponding cup portion 13, 15. 13 / d 15 The corresponding extension in the downward direction D. Figure 7 In the transverse film direction X corresponding to the viewing direction shown, the cup portions 13, 15 are limited by respective side portions 16. The side portions 16 and the sealing portion 17 of the bag film 1 can be kept in a horizontal plane during forming (e.g., press forming and / or folding) of the bag film 1, in particular using the apparatus 100 as described below, in particular when the cup portions 13 and 15 are recessed from the bag film 1.

[0104] The tip or peak of the bridging portion 14 is provided with a notch 41, so that the bridging portion 14 has an M-like shape in a cross-sectional view. Preferably, the bag film 1 is continuously curved along its path from the first cup portion 13 to the second cup portion 15. Therefore, the bridging portion 14 can be continuously curved. The bridging portion 14 includes a centrally arranged notch 41. In the region of the notch 41, the bag film is preferably continuously curved in an arc shape protruding downward (or: outward). On each side of the notch 41 in the longitudinal film direction Y, a corresponding vertex 46, 47 can be formed, which will be referred to below. Fig. 9 As described in further detail, the apexes 46 and 47 are preferably formed into a continuously curved arc shape protruding upward (or: inward).

[0105] like Figure 8 As shown, due to the provision of the center of the bridging portion 14 and the inner surface 31 and the notch 41 of the bag film 1, the second cup portion 15 can be easily and accurately folded onto the first cup portion 13 (or vice versa) to form a bag for accommodating the electrode assembly 21. Since the notch 41 in the bridging portion 14 defines a pivot axis for folding the bag film 1 onto itself, undesirable deformation of the bag film 1, especially in the area of ​​the side portion 16, can be avoided, and piercing of the electrode assembly 21 by the bridging peak can be avoided.

[0106] Fig. 9 A detailed view of the bag film 1 engaged between the dividing wall 114 and the stripper portion 214 of the apparatus 100 for embossing the recess 41 into the bag film 1 is shown. Fig. 9 In the illustration shown, several components of the apparatus 100 are not shown, in particular the punch pads 213 , 215 .

[0107] The bag film 1 has a substantially constant and continuous film thickness d1. The notch 41 is pressed into the inner surface 31 of the bag film 1 by means of the stripper portion 214, wherein the partition wall 114 opposite the stripper portion 214 adapts to the deformation of the outer surface 32 of the bag film 1. The notch 41 inserted into the bag film 1 has a notch depth d4. The notch depth d4 is less than the film thickness d1. Fig. 9 In the embodiment shown, the film thickness d1 is 183 μm. In the embodiment shown, the notch depth d4 is approximately 40% of the film thickness d1. The notch 41 extends in the longitudinal film direction Y between a first vertex 46 on the side of the first cup portion 13 on the one hand and a second vertex 47 on the side of the second cup portion 15 on the other hand. The notch width w4 of the notch 41 in the longitudinal film direction Y between the vertices 46 and 47 is greater than the notch depth d4. The notch width w4 can be as large as the film thickness d1 or smaller than the film thickness d1. In particular, if Fig. 9 As shown, notch width w4 may be approximately 75% of film thickness d1 .

[0108] In some embodiments, for example, Fig. 9 As shown, the partition wall 114 can be provided with different wall sections in the transverse direction X, which can have different heights, so as to form a bridge portion 14 with corresponding offset sections. This will be referred to below. Fig.10 Described in further detail.

[0109] Fig.10 A cross-sectional view of a bag film is shown, wherein the viewing direction corresponds to the longitudinal film direction Y. In the transverse film direction X, the bridging portion 14 is divided into several sections 42, 43, 44, 45 of different heights above the bottom of the adjacent cup portions 13, 15. The central bridging section 44 is offset from a plane defined by the side portions 16 and / or the sealing portion 17 around the cup portions 13, 15. The height difference or short: the size of the offset s can be in the range of 0.05mm to 5mm, in particular in the range of 0.1mm to 2.5mm, preferably in the range of 0.2mm to 2mm. The central bridging section 44 has a first length L1. The central bridging section 44 can be arranged between the first side bridging section 43 on one side and the second side bridging section 45 on the other side. The side bridging sections 43, 45 can be flush (horizontal) with the corresponding adjacent side portions 16. In the example shown, both side bridging sections 43, 45 have the same second length L2.

[0110] The change in height or offset s between the side bridging sections 43, 45 and the central bridging section 44 is overcome by the corresponding inclined sections 42 on either side of the central bridging section 44. The first inclined section 42 connects the first side bridging section 43 with the central bridging section 44. The second inclined section 42 connects the second side bridging section 45 with the central bridging section 44. In the illustrated embodiment, the inclined sections 42 have the same third length L3. The first length L1 is greater than the third length L3, preferably at least a multiple of the second length L2. The second length L2 is greater than the third length L3. The sum of the first length L1, the two second lengths L2 and the two third lengths L3 preferably corresponds to the cup width w 13 and / or 15 The first length L1 may be dimensioned to be at least equal to the cup width w 13 and / or 15 half the length, preferably the cup width w 13 and / or 15 The first length L1 may be dimensioned in particular to be at least a quarter, preferably at least a half, of the total width of the bag film 1 in the transverse direction X. The second length L2 may be approximately 10 mm. The first length L1 may be approximately 30 mm.

[0111] Fig.11 A schematic diagram of an apparatus 100 according to the present disclosure is shown. The apparatus 100 includes a die portion 110 (hereinafter referred to as die 110), a punch 210 and a stripper portion 214 as its main components. The apparatus 100 is configured to allow the punch 210 to move relative to the die 110 in a downward direction D so as to lower the punch 210 into the die 110. It may be preferred that the punch 210 is stationary and the die 110 is movable in an upward direction (and backward) opposite to the downward direction D. The apparatus 100 is also configured to allow the stripper portion 214 to move relative to the punch 210, in particular for releasing the deep-drawn bag film 1 from the punch 210.

[0112] Reference Figures 1 to 4 According to the above description, the upper die may include the punch 210 or consist of the punch 210 , and the lower die may include the die portion 110 or consist of the die portion 110 .

[0113] The die 110 includes a first accommodation space 113 and a second accommodation space 115 and a partition wall 114 that separates the accommodation spaces 113 and 114 from each other. The punch 210 includes a first punch pad 213 and a second punch pad 215. The first punch pad 213 corresponds to and is associated with the first accommodation space 113. The second punch pad 215 corresponds to and is associated with the second accommodation space 115.

[0114] The initially flat bag film 1 is located between the punch 210 and the die 110. The lower side 32 of the bag film 1 is located on the top surface 111 of the die 110. The upper side 31 of the bag film 1 faces the punch 210 and the stripper portion 214.

[0115] In order to form the bag film 1 for manufacturing the battery case 11 according to the present disclosure, the punch 210 is lowered into the die 110. More specifically, the first punch pad 213 is lowered into the first accommodation space 113 to press the first cup portion 13 into the bag film 1, and the second punch pad 215 is lowered into the second accommodation space 215 to press the second cup portion 15 into the bag film 1. When the punch 210 is lowered into the die 110, the bridging portion 14 is formed as an upward protrusion by the partition wall 114, and the partition wall 114 protrudes into the space 240 between the punch pads 213 and 214. The wall thickness t of the partition wall 114 corresponds to the width of the space 240.

[0116] like Fig.12 As suggested by the detailed view of the device 100 shown, the bag film 1 is clamped between the stripper portion 214 and the partition wall 114. The stripper portion 214 is provided with a protrusion 241 configured to emboss the notch 41 into the inner surface 31 of the bag film 1. The partition wall is provided with a groove or fold 141 for accommodating a section of the bag film 1 that is pressed downwards when the notch 41 is introduced.

[0117] Fig.13 and Fig.14 The geometry of the stripper portion 214 of the partition wall 114 of the mold 110 comprising the protrusions 241 on the one hand and the recesses 141 on the other hand is shown in detail.

[0118] Fig.13 The partition wall 114 is shown joined to the bag film 1. The partition wall 114 has a wall thickness t. The partition wall extends from the first flank 148 to the second flank 149 in the longitudinal direction Y. The vertex of the partition wall 114 is continuously curved, wherein two upwardly protruding shoulders 143, 145 surround the downwardly protruding central fold 141. The first shoulder 143 forms the edge of the peak toward the first flank 148, thereby limiting the first formed space 113. The second shoulder 145 forms the edge of the peak toward the second flank 149, thereby limiting the second formed space 115. The shoulders 143, 145 are mirror-symmetrical.

[0119] The shoulder defines a first radius of curvature R1. The first radius of curvature R1 of the shoulders 143, 145 is preferably equal. The first radius of curvature R1 of the shoulders 143, 145 may be not less than one tenth of the wall thickness t, in particular not less than one sixth. Alternatively or additionally, the wall thickness t is at least three times the first radius of curvature R1, preferably at least four times the first radius of curvature R1. The first radius of curvature R1 may be at least 0.1 mm, preferably at least 0.15 mm, and / or not more than 0.5 mm, preferably not more than 0.3 mm. In particular, the first radius of curvature R1 may be about 0.2 mm. The first radius of curvature R1 may be at least as large as or larger than the film thickness d1.

[0120] The groove 141 forms a dent at the top end of the partition wall 114. The groove 141 has an arcuate shape extending from the first shoulder 143 to the second shoulder 145. The groove may define a second radius of curvature R2. The second radius of curvature R2 of the groove may be not less than one tenth of the wall thickness t, in particular not less than one quarter of the wall thickness t. Alternatively or additionally, the wall thickness t is at least twice the second radius of curvature R2, preferably at least three times the second radius of curvature R2. The second radius of curvature R2 may be at least 0.2 mm, preferably at least 0.25 mm, and / or not more than 0.8 mm, preferably not more than 0.4 mm. In particular, the second radius of curvature R2 may be about 0.3 mm. The second radius of curvature R2 is greater than the film thickness d1, however, preferably, the second radius of curvature is not more than twice the second radius of curvature R2.

[0121] The second radius of curvature R2 is preferably greater than the first radius of curvature R1. A first central distance c between the midpoint of the curvature of the shoulder 143 and / or 145 and the midpoint of the curvature of the groove 141 in the downward direction D is 12 is at least 0.2 mm, in particular at least 0.3 mm, and / or is not more than 0.6 mm, in particular not more than 0.5 mm. Preferably, c 12 About 0.5mm.

[0122] Fig.14The stripper portion 214 is shown engaged with the bag film 1. The stripper portion 214 has a generally flat plate surface 240. Therefore, the stripper portion 214 may sometimes be referred to as a stripper plate 214. The plate surface 240 extends in the longitudinal direction Y and the transverse direction X. The plate surface 240 is provided with a ridged protrusion 241, which is configured to bend the bag film 1 to form the notch 41. The protrusion 241 is continuously bent in the longitudinal direction Y. The protrusion has a central tip and a cosine-like shape that flattens toward either side. The transition from the plate surface 240 to the protrusion 241 is preferably continuous. The transition sections 243, 245 on either side of the protrusion 241 are continuously bent until they are flush with the plate surface 240. The transition sections 243, 245 are mirror-symmetrical. The protrusion 241 has a protrusion width w extending from the beginning of the first transition section 243 to the end of the second transition section 245 in the longitudinal direction Y. 14 The respective transition section 241 , 243 begins or ends at the level of the plate surface 240 . The protrusion width w 14 It may be at least 0.05 mm, preferably at least 0.1 mm, and / or not more than 2 mm, preferably not more than 1 mm.

[0123] The transition sections 243, 245 define a third radius of curvature R3. The third radius of curvature R3 of the transition sections 243, 245 are preferably equal. The third radius of curvature R3 may be not less than a quarter of the film thickness d1, in particular not less than half of the film thickness d1. Alternatively or additionally, the third radius of curvature R3 may be not more than ten times the film thickness d1, in particular not more than six times the film thickness d1. The third radius of curvature R3 is preferably corresponding to the protrusion width w 14 The third radius of curvature R3 may be at least 0.05 mm, preferably at least 0.1 mm, and / or not greater than 2 mm, preferably not greater than 1 mm.

[0124] The protrusion 241 may define a fourth radius of curvature R4. The fourth radius of curvature R4 may be not less than one tenth of the film thickness d1, in particular not less than one quarter of the film thickness d1. Alternatively or additionally, the fourth radius of curvature R4 may be not more than five times the film thickness d1, in particular not more than three times the film thickness d1. The fourth radius of curvature R4 is preferably corresponding to the protrusion width w 14 The fourth radius of curvature R4 may be at least 0.02 mm, preferably at least 0.05 mm, and / or not greater than 0.75 mm, preferably not greater than 0.5 mm.

[0125] The third radius of curvature R3 is preferably greater than the fourth radius of curvature R4. A second central distance c between the midpoint of the curvature of the transition section 243 and / or 245 and the midpoint of the curvature of the protrusion 241 in the downward direction D is 34is at least 0.05 mm, in particular at least 0.1 mm, and / or is not more than 0.5 mm, in particular not more than 0.3 mm. Preferably, c 34 About 0.2mm.

[0126] Although the preferred embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concepts of the present disclosure defined in the appended claims also fall within the scope of the present disclosure.

[0127] Description of Reference Numerals

[0128] 1 bag film

[0129] 10 Secondary batteries

[0130] 11 Battery housing

[0131] 12 Peripheral area

[0132] 13 First Cup Section

[0133] 14 Bridge Section

[0134] 15 The Second Cup

[0135] 16 Side Section

[0136] 17 Sealing part / degassing part

[0137] 18 First shell section

[0138] 19 Second shell section

[0139] 21. Electrode assembly

[0140] 22 Electrode connector

[0141] 23 Electrode, negative electrode

[0142] 24 Diaphragm

[0143] 25 Electrode, positive electrode

[0144] 26 Insulation

[0145] 27 Electrode lead

[0146] 31 First surface (inner surface) / inner surface)

[0147] 32 Second surface (external surface) / external surface)

[0148] 41 Notch

[0149] 42 Inclined bridge section

[0150] 43 First side bridge section

[0151] 44 Central Bridge Section

[0152] 45 second side bridging section

[0153] 100 devices

[0154] 110 Mould

[0155] 111 Top surface

[0156] 114 Partition Wall

[0157] 113, 115 Forming Space

[0158] 141 creases, grooves

[0159] 143 First Shoulder

[0160] 145 Second Shoulder

[0161] 210 Punch

[0162] 213, 215 Punch pad

[0163] 214 Demolder unit

[0164] 240 board surface

[0165] 241 Protrusion

[0166] 243 First transition section

[0167] 245 Second transition section

[0168] 300 devices

[0169] 301 Upper mold

[0170] 302 lower mold

[0171] 303 Upper surface / anvil

[0172] 304 Mould Department

[0173] 305 base

[0174] 306 Protrusion / partition wall

[0175] 307 Tip / Peak

[0176] 308 Gap

[0177] 309 Punch

[0178] 310 Demolder unit

[0179] 1000 (bag) film

[0180] 1001 Secondary battery

[0181] 1002 bags

[0182] 1003 Peripheral area

[0183] 1004 Sealing part

[0184] 1005 cup / cup portion

[0185] 1006 Bridge Section

[0186] 1007 Bat Ears

[0187] 1010 Electrode Assembly

[0188] D Up / Down Direction

[0189] D Up / Down Direction

[0190] d1 Film thickness

[0191] d4 notch depth

[0192] d 13 First cup depth

[0193] d 15 Second cup depth

[0194] H Hollow Space

[0195] h Height

[0196] L1 First Length

[0197] L2 Second length

[0198] L3 Third length

[0199] l 13 First cup length

[0200] l 15 Second cup length

[0201] P Height Difference

[0202] R1 First radius of curvature

[0203] R2 Second radius of curvature

[0204] R3 Third radius of curvature

[0205] R4 Fourth radius of curvature

[0206] S Offset

[0207] T Wall thickness

[0208] w4 notch width

[0209] w 13 First cup width

[0210] w 14 Protrusion Width

[0211] w 15 Second cup width

[0212] X horizontal direction

[0213] Y lengthwise / longitudinal direction

Claims

1. A pouch-type battery housing (10), the pouch-type battery housing (10) being configured to accommodate an electrode assembly (21), the electrode assembly (21) having a structure in which electrodes (23, 25) and separators (24) are alternately arranged, the battery housing (10) comprising: A bag film (1), the bag film (1) having a film thickness (d1), a first surface (31) and a second surface (34); a first cup portion (13) formed in the bag film (1) and having a concave shape offset from the first surface (31) toward the second surface (34); a second cup portion (15) formed in the bag film (1) and having a concave shape offset from the first surface (31) toward the second surface (34); a bridging portion (14) formed in the bag film (1) between the first cup portion (13) and the second cup portion (15), and the bridging portion (14) connects the first cup portion (13) to the second cup portion (15), The bridging portion (14) includes a notch (41) formed in the first surface (31) and protruding toward the second surface (34).

2. The pouch-type battery housing (10) according to claim 1, wherein: The recess (41) has a recess depth (d4) that is less than the film thickness (d1), in particular less than half the film thickness (d1).

3. The pouch-type battery housing (10) according to claim 1 or 2, wherein: The notch (41) has a notch width extending along the longitudinal film direction between two vertices (46, 47) adjacent to the notch (41), wherein the notch width is at least half of the film thickness (d1), in particular at least 1 times the film thickness (d1), and / or not greater than 3 times the film thickness (d1), in particular not greater than 2 times the film thickness (d1).

4. The pouch-type battery housing (10) according to one of the preceding claims, wherein: The bridge portion (14) defines a bridge portion width extending from the first cup portion (13) to the second cup portion (15), wherein the notch (41) has a notch width (w4) that is less than half of the bridge portion width.

5. The pouch-type battery housing (10) according to one of the preceding claims, wherein: The bridge portion (14) has an M-shaped cross section in the longitudinal film direction.

6. The pouch-type battery housing (10) according to one of the preceding claims, wherein: The film thickness (d1) of the bag film (1) is 100 μm to 250 μm, in particular 160 μm to 200 μm, and preferably 180 μm to 190 μm.

7. A pouch-type battery housing (10), the pouch-type battery housing (10) being particularly The pouch-type battery case (10) according to one of the preceding claims, the pouch-type battery case (10) being configured to accommodate an electrode assembly (21), the electrode assembly (21) having a structure in which electrodes (23, 25) and separators (24) are alternately arranged, the battery case (10) comprising: A bag film (1), the bag film (1) having a film thickness (d1), a first surface (31) and a second surface (34); a first cup portion (13) formed in the bag film (1) and having a concave shape offset from the first surface (31) toward the second surface (34); a second cup portion (15) formed in the bag film (1) and having a concave shape offset from the first surface (31) toward the second surface (34); a bridge portion (14) formed in the bag film (1) between the first cup portion (13) and the second cup portion (15) and connecting the first cup portion (13) to the second cup portion (15); The bridging portion (14) separating the first cup portion (13) from the second cup portion (15) in the longitudinal film direction and extending in the transverse film direction includes a central bridging section (44) arranged between two side bridging sections (43, 45) in the transverse film direction, wherein the central bridging section (44) is offset from the side bridging sections (43, 45) toward the second surface (34).

8. The pouch-type battery case (10) according to claim 7, wherein: The side bridging sections (43, 45) are at the level of the inner surface (31) of the bag film (1) surrounding the cup parts (13, 15), in particular at the level of the plane defined by the inner surface (31) surrounding the first cup part (13) and / or the second cup part (15).

9. The pouch-type battery housing (10) according to claim 7 or 8, wherein: The central bridge section (44) has a first length and the side sections (43, 45) each have a second length, wherein the first length is greater than the second length, in particular, the first length is at least twice the second length.

10. The pouch-type battery housing (10) according to one of claims 7 to 9, wherein: The bridging portion (14) further includes an inclined section (42) connecting the central section (44) and the side sections (43, 45).

11. A secondary battery, comprising: A battery housing (10) according to one of the preceding claims, the battery housing (10) being folded onto itself so that the first cup portion (13) and the second cup portion (15) are placed directly opposite each other to form a bag; and an electrode assembly (21), the electrode assembly (21) being accommodated in the bag.

12. A battery housing forming device (100) for manufacturing a pouch-type battery housing (10), in particular a battery housing forming device for manufacturing a pouch-type battery housing (10) according to one of claims 1 to 10, the battery housing forming device (100) comprising: A mold (110), the mold (110) having a top surface (111) on which the bag film (1) is to be placed, and the mold (110) comprising two forming spaces (113, 115) recessed from the top surface (111) and a partition wall (114) separating the forming spaces (113, 115); a punch (210) disposed above the forming space (113, 115), wherein the punch comprises two punch pads (213, 215), and wherein the punch (210) is operable to lower the punch pads (213, 215) so as to insert the bag film (1) placed on the top surface (111) into the forming space (113, 115); and an ejector portion (214) cooperating with the punch (210) and arranged between the punch pads (213, 215), wherein the demoulder portion (214) comprises a protrusion (241), wherein the protrusion (241) is configured to form a notch (41) into the bag film (1), Wherein, the partition wall (114) includes a fold (141) opposite to the protrusion (241) for receiving a portion of the bag film (1).

13. The battery case forming apparatus (100) according to claim 12, wherein: The protrusion (241) has a protrusion height, wherein the protrusion height is less than the film thickness (d1) of the bag film (1) to be formed, in particular, less than half of the film thickness (d1) and / or at least one tenth of the film thickness (d1); and / or wherein the crease (141) has a crease depth, wherein the crease depth is less than the film thickness (d1) of the bag film (1) to be formed, in particular, less than half of the film thickness (d1) and / or at least one tenth of the film thickness (d1), wherein in particular, the crease depth corresponds to the protrusion height, preferably is equal to the protrusion height.

14. The battery casing forming apparatus (100) according to claim 13 or 14, wherein: The fold (141) defines a fold width extending between adjacent shoulders (143, 145) of the partition wall (114), and the partition wall (114) has a wall thickness (t) defined between two formed spaces (113, 115), wherein the wall thickness (t) is at least 1.1 times the fold width, in particular at least 1.25 times the fold width, and / or wherein the wall thickness (t) is not more than 2 times the fold width, in particular not more than 1.5 times the fold width, wherein the wall thickness (t) is greater than the film thickness (d1) of the bag film (1) to be formed, wherein in particular, the wall thickness (t) is at least 2 times the film thickness (d1), preferably at least 4 times the film thickness (d1), and / or wherein the wall film thickness (d1) is not greater than 10 times the wall thickness (t), in particular not greater than 6 times the film thickness (d1).

15. The battery housing forming device (100) according to one of claims 13 to 15, wherein: The protrusion (241) has a protrusion width between adjacent planar flanks of the stripper portion (214), wherein the protrusion width is greater than the protrusion height, In particular, the protrusion width is at least 1.25 times the protrusion height, preferably at least 1.5 times the protrusion height, and / or the protrusion width is not more than 3 times the protrusion height, preferably not more than 2 times the protrusion height.

16. A battery housing forming device (100) for manufacturing a pouch-type battery housing (10), the battery housing forming device (100) being in particular a battery housing forming device (100) according to one of claims 12 to 15, wherein the pouch-type battery housing (10) is in particular According to one of claims 1 to 10, the pouch-type battery case (10) comprising: A mold (110), the mold (110) having a top surface (111) on which the bag film (1) is to be placed, and the mold (110) comprising two forming spaces (113, 115) recessed from the top surface (111) and a partition wall (114) separating the forming spaces (113, 115); a punch (210) disposed above the forming space (113, 115), wherein the punch comprises two punch pads (213, 215), and wherein the punch (210) is operable to lower the punch pads (213, 215) so as to insert the bag film (1) placed on the top surface (111) into the forming space (113, 115); and an ejector portion (214) cooperating with the punch (210) and arranged between the punch pads (213, 215); wherein the partition wall (114) is arranged between the forming spaces (113, 115) in a transverse direction, wherein the partition wall (114) comprises a central wall section arranged between two side wall sections in the transverse direction, wherein the central wall section is offset relative to the side wall section in the direction in which the punch pad (213, 215) descends.

17. The battery case forming apparatus (100) according to claim 16, wherein: The demolding device portion (214) and / or the punch (210) have a lug portion, wherein the lug portion is arranged between the punch pads (213, 215), and wherein the lug portion includes a central lug segment arranged in a transverse direction between the lateral lug segments, wherein the central lug segment protrudes so as to be introduced into a retraction portion of the mold (110) provided by the central wall segment.

Images