Method for manufacturing a battery cell having a pouch housing

Abstract

The present invention provides a method (50) for manufacturing a battery cell (100), comprising: providing a battery cell housing blank (10) having a first side (11) and a second side (12), the first side (11) and the second side (12) being connected by a folding edge (30); a first cavity (31) being formed or provided in the first side (11); a second cavity (32) being formed or provided in the second side (12); the first side (11) and / or the second side (12) including at least one third cavity (33); and folding the first side (11) and the second side (12) along the folding edge (30); The present invention relates to a method for manufacturing a battery cell housing blank (10), a battery cell (20), and an electrochemical cell (100) comprising: sealing the first and second sides (11, 12) along at least two edges that abut against the folded edge (30), with a remaining opening (15); placing a battery cell component (200) inside a space (14) formed by the first cavity (31) and / or the second cavity (32); filling an electrolyte solution (110) into the first cavity (31), the second cavity (32), and the at least one third cavity (33); and sealing or closing the openings (15) after filling the electrolyte solution (110), and venting gas components into the at least one third cavity (33). The present invention also relates to a battery cell housing blank (10), an as-manufactured battery cell (20), and an electrochemical cell (100).

Description

[Technical Field]

[0001] The present disclosure relates to methods for manufacturing battery cells, particularly battery cells having pouch-type housings. Additionally, the present disclosure relates to battery cell housing blanks and battery cell housings during the manufacture of battery cells, or so-called "as-manufactured battery cells," and electrochemical cells.

[0002] Lithium-ion batteries are used in various technical fields to provide stored energy to electrical components such as electric motors, displays, etc. In particular, in electric and hybrid electric vehicles, such lithium-ion batteries supply electrical energy to vehicle components and drivelines. Continuous development is underway toward higher capacity lithium-ion batteries. The capacity of a battery can be increased by increasing the surface area of ​​the electrodes. This is achieved through more complex surface structures.

[0003] During the manufacture of lithium-ion batteries, a battery cell housing is provided and equipped with typical battery components, such as an anode structure, a cathode structure, and a separator structure. The battery cell housing is then filled with an electrolyte solution that is absorbed by the battery components. This manufacturing process requires multiple replenishments of the electrolyte solution and can last for several hours or days, depending on the battery cell characteristics. The battery cell housing is typically open to the environment during this waiting period until complete absorption of the electrolyte solution.

[0004] Therefore, mass production of such battery cells requires large storage or manufacturing areas that meet high standards to prevent any contamination by dust and aerosols, especially for pouch-type battery cells, which are complex, expensive to build and maintain, and increase the manufacturing costs of the battery cells.

[0005] It is an object of the present disclosure to provide a battery cell, a battery cell housing blank, and a method for manufacturing an as-manufactured battery cell that allows absorption of electrolyte solution by the battery cell components over an extended period of time without risk of contamination or deterioration of the battery housing. This object is achieved by the subject matter of the independent claims. Further developments of the subject matter of the independent claims are provided in the dependent claims.

[0006] According to one aspect of the present disclosure, a method for manufacturing a battery cell is provided. In one step of the method, a cell housing blank is provided having a first side and a second side. The first side and the second side are connected by a folded edge. A first cavity of the cell housing blank is formed or provided in the first side, and a second cavity is formed or provided in the second side.

[0007] The first side and / or the second side include at least one third cavity. For example, one third cavity of the battery cell housing blank can be located on the first side and one optional third cavity can be located on the second side. The battery cell housing blank can be formed as a single-layer or multi-layer foil that can include aluminum and plastic materials.

[0008] The first side and the second side are folded along the folded edges, and the first side and the second side are sealed along at least two edges that abut against the folded edges to form a bag having an opening.

[0009] In a further step, the battery cell component is placed inside the space formed by the first cavity and the second cavity.

[0010] The battery cell components can be placed into the first cavity and / or the second cavity before or after folding and sealing the cell housing blank or foil. Additionally, the battery cell components, particularly the anode and cathode layers, can be contacted by conductors before folding and sealing to enable electrical connection outside the battery cell blank.

[0011] In a further step, an electrolyte is filled into the first cavity, the second cavity, and at least one third cavity. The openings are sealed or closed after the electrolyte is filled. The openings can be closed by providing one or more folds, clamping, closing a zipper, etc.

[0012] The gaseous component is discharged into the at least one third cavity during the absorption process.

[0013] Based on the arrangement of the first, second, and third cavities, the first cavity may face the second cavity in the folded state of the cell housing blank, and the two third cavities may also face each other in the folded state of the cell housing blank. Thus, a first space may be defined by the first and second cavities for incorporating battery cell components, and a second space may be formed by two adjacent third cavities for incorporating a portion of the electrolyte solution.

[0014] Since the entire interior of the battery cell housing is closed after filling with the electrolyte solution, any contamination of the inner cavity and of the battery components inside the battery housing is prevented. Therefore, the storage area or manufacturing area where the battery cells are stored during the electrolyte absorption time is no longer required to meet high standards. Therefore, the manufacturing site can be cheaper to build and maintain, so that the manufacturing labor and manufacturing costs of the battery cells can be reduced.

[0015] When the electrolyte solution is filled into the space between the battery cell components and the cell housing blank in the first and second cavities through at least one third cavity, the filling of the electrolyte solution can be technically simplified. Therefore, a complex filling mechanism is not required to apply the electrolyte solution into the battery cell housing. Furthermore, it is not required to provide any holes or perforations in the battery cell housing cavity for filling the electrolyte solution.

[0016] According to a further embodiment, after complete immersion of the electrolyte by the battery cell components, any remaining electrolyte is guided into the at least one third cavity. Such a process may be performed by a pressure difference with the interior of the battery cell housing and / or by gravity, for example, by rotating the entire device.

[0017] The at least one third cavity is removed by providing a second seal within the space formed between the third cavity and the first and second cavities. Such second seal may be a heat seal that closes the space formed by the second and first cavities simultaneously with lamination and cuts out the at least one third cavity. Alternatively, after providing the second seal, cutting may be performed to remove the third cavity and form the final battery cell or electrochemical cell. Thus, the second seal is provided such that the open area between the edges sealed by the first seal is at least partially closed.

[0018] Degassing of the interior of the battery cell housing blank can be accelerated and simplified if the first side and / or the second side include at least one third cavity and at least one fourth cavity, where gas components are vented into the at least one fourth cavity and / or into the at least one third cavity. Thus, in addition to the third cavity, the fourth cavity can also incorporate gas components.

[0019] According to a further embodiment, after the residual electrolyte solution is introduced into at least one third cavity, the cell housing blank in the region of the first and second cavities converges against the cell housing components. This mechanism can support the transfer of the residual electrolyte solution into the third cavity. By applying a higher pressure to the outer surface of the battery cell housing, the material of the battery cell housing is pressed against the battery cell components so that any excess electrolyte solution cannot remain in the first and / or second cavities. This measure ensures the most compact battery cell size possible and prevents waste of electrolyte solution. Therefore, if the electrolyte solution introduced into the third cavity is reused or recycled, production costs can be further optimized.

[0020] When the gaseous components accumulated in the at least one fourth cavity are removed by forming at least one third seal that separates the at least one fourth cavity from the at least one third cavity, evacuation of the gaseous components from the interior of the battery cell housing can be provided in a controlled manner. After forming the at least one third seal, the at least one fourth cavity can be perforated to allow evacuation of the gaseous components. Alternatively or additionally, the fourth cavity can be discarded after being cut out.

[0021] According to a further embodiment, the at least one first seal, the at least one second seal and / or the at least one third seal are formed as heat seals by applying heat to predetermined lines or areas or paths, which allows for a technically simple joining of both sides of the battery cell housing blank.

[0022] In accordance with a further aspect of the present invention, a battery cell housing blank is provided. The battery cell housing blank may be formed as a single or multi-layer foil or sheet. The battery cell housing blank may comprise aluminum or an aluminum alloy.

[0023] The battery cell housing blank is configured to form a pouch-shaped battery cell housing and includes a first side and a second side. A first cavity is formed in the first side and a second cavity is formed in the second side. A folding edge separates the first side from the second side. The first side and / or the second side includes at least one third cavity spaced from the first cavity and / or the second cavity along a height axis.

[0024] The first side is formed as a first end section of the battery cell housing blank, and the second side is formed as a second end section, the first end section and the second end section being separated by a fold edge, which may initially be defined as an imaginary line or a line with perforations for improved foldability.

[0025] After the first end section is folded along the fold edge or fold line, the first end section and the second end section form the first side and the second side of the battery cell housing and are joined together to at least partially enclose the cavity and form multiple spaces for various tasks and components.

[0026] The first and second cavities are provided for incorporating battery cell components, and at least one third cavity is configured, for example, to incorporate a temporary electrolyte solution and to receive a gaseous component.

[0027] In one embodiment of the battery cell housing blank, the second cavity is aligned with the first cavity in a manner that makes the second cavity a mirror image of the first cavity, with the folding edge acting as a mirror axis. Thus, the first cavity is identically formed and positioned with respect to the second cavity. After folding the first and second sides of the battery cell housing blank, the sides are separated or connected to each other by folding surfaces extending from the folding edges.

[0028] In the folded state of the battery cell housing blank, the first cavity can face the second cavity such that the space is symmetrically shaped about the folding plane. This arrangement of the cavities can provide a structurally stable space for assembling the battery cell components, with joining surfaces or lines extending along the central folding plane.

[0029] If the first side and / or the second side include at least one fourth cavity, the evacuation of the battery cell components and the electrolyte solution during the manufacture of the battery cell can be improved. Therefore, gaseous components can first be extracted into the fourth cavity. In a possible process, multiple evacuation procedures can be provided by removing the fourth cavity by providing a heat seal between the fourth cavity and the third cavity. Gaseous components trapped inside the fourth cavity can be released by piercing the fourth cavity after providing a third seal. Additionally, further released gaseous components can be vented into a further fourth cavity or third cavity, which can also be removed from the first and second cavities in a further process.

[0030] In a further embodiment, the at least one fourth cavity is spaced apart from the at least one third cavity along and / or across the height axis. Thus, the distance between the third and fourth cavities can be utilized to provide a heat seal that also functions as a containment and cutting surface. By providing a heat seal, the first and second sides of the battery cell housing blank are locally melted and joined along a seal or sealing locus.

[0031] By drilling the removed fourth and / or third cavities, recycling or reuse of excess electrolyte solution can be achieved.

[0032] The at least one fourth cavity may be arranged in a particularly space-saving manner if the fourth cavity is formed in at least one corner of the cell housing blank. Thus, the fourth cavity may have a triangular shape, and the third cavity may include a diagonally formed border or edge facing the fourth cavity to ensure optimal fit of both the third and fourth cavities in a predetermined area of ​​the battery cell housing blank.

[0033] According to a further embodiment, at least one third cavity is formed adjacent to an edge of the first side surface and / or an edge of the second side surface that form an opening for electrolyte filling. Therefore, the battery cell components can be easily technically positioned through the opening after joining the first and second sides of the battery cell housing blank. Furthermore, the electrolyte solution can also be introduced into the space through the opening without the need for special tools or a fill port.

[0034] When the first cavity and / or the second cavity are formed as a truncated pyramid, the space for incorporating the battery cell components can provide for easier positioning through the opening, thus increasing the initial volume of the space and providing the possibility of automatic positioning of the battery cell components within the space.

[0035] After applying the electrolyte solution, the additional volume provided by the shape of the first and / or second cavities allows for accelerated adsorption of the electrolyte solution because it reaches all portions of the battery cell components within a shortened period of time.

[0036] In a further embodiment of the battery cell housing blank, the space between the at least one third cavity and the at least one fourth cavity for providing the third seal is formed in an inclined manner so that removing the at least one fourth cavity removes at least one edge of the battery cell housing blank along the third seal along with the at least one fourth cavity. This method allows for a space-saving arrangement of cavities within the battery cell housing blank. Furthermore, removing multiple cavities filled with gaseous components allows for multiple evacuation.

[0037] According to a further aspect of the present invention, there is provided an as-manufactured battery cell including a cell housing blank of the present invention, the cell housing blank being folded along a folding edge and joined, for example, via a first sealing, to form a housing bag.

[0038] Depending on the layer design of the battery cell housing bag, at least two surfaces of the first and second sides may be glued or fused together in one layer, which may be formed, for example, as a plastic, such as PP, PVC, HDPE, nylon.

[0039] An as-manufactured battery cell is a battery cell during manufacturing that requires absorption of electrolyte and modification to a housing bag to reach a final or completed battery cell state. The housing can be formed from one or multiple layers. For example, aluminum can be used as one layer of the housing. The housing can be formed, for example, as a pouch-type housing.

[0040] The housing bag includes at least one space for incorporating battery cell components, which may include an anode, a cathode, and a separator, and which are rolled or folded to increase their effective area.

[0041] The electrolyte solution is filled into at least one space with the positioned battery cell components and into at least one third cavity, which functions as a buffer cavity and provides excess electrolyte solution to prevent additional replenishment of the electrolyte solution, which generally carries the risk of contamination, or to minimize the amount of replenishment of the electrolyte solution.

[0042] According to one embodiment, a vacuum or reduced pressure is applied to the space and the at least one third cavity before or after the electrolyte solution is introduced into the housing bag, and the opening of the housing bag can then be sealed or closed.

[0043] The at least one third cavity is connected to the space housing the battery cell components so that excess electrolyte solution can flow directly to the battery cell components as needed. The at least one third cavity is configured to incorporate gaseous components during battery cell fabrication. Thus, the third cavity serves multiple tasks by providing a buffer volume for the electrolyte solution and by providing a volume for capturing rising gaseous components.

[0044] Such an as-manufactured battery cell may include an opening that is closed after filling with the electrolyte solution. After a specified period of time, the third cavity may be removed from the housing bag by providing a second seal between the third cavity and the space containing the battery cell components. This period of time preferably lasts until the complete immersion or absorption of the electrolyte solution by the battery cell components.

[0045] The amount or volume of the electrolyte solution absorbed by the battery cell components is determined and limited by the battery cell components, for example, their size and material. Preferably, after complete immersion or absorption of the electrolyte solution by the battery cell components, an excess amount of the electrolyte solution can remain inside the third cavity.

[0046] Over time, the section of the third cavity with the electrolyte solution will decrease so that the available volume of the gaseous component is increased at the same time, so that an exchange of the electrolyte solution with the gaseous component can occur so that evacuation or venting of the third cavity can be omitted.

[0047] In a further aspect of the present invention, there is provided an electrochemical cell formed by the method of the present invention. The electrochemical cell may be formed as a battery cell. In particular, the electrochemical cell may be formed as a lithium ion battery cell.

[0048] The electrochemical cell includes a pouch-shaped battery cell housing having a space defined by a first cavity and / or a second cavity that incorporates the battery cell components, the space being sealed by at least one first seal and at least one second seal that define edges of the battery cell housing.

[0049] The present disclosure is explained in more detail below on the basis of schematic embodiments shown in the accompanying drawings. [Brief explanation of the drawings]

[0050] [Figure 1A] 1 shows a perspective view of an exemplary battery cell housing blank according to an embodiment of the present invention. [Figure 1B] 1B shows a cross-sectional view of the first cavity of FIG. 1A. [Figure 2] 1 illustrates an exemplary as-manufactured battery cell according to an embodiment of the present invention. [Figure 3A] 10 illustrates an exemplary as-manufactured battery cell according to a further embodiment of the present invention. [Figure 3B]3B illustrates an as-manufactured battery cell of the embodiment of FIG. 3A with the sealable area visualized. [Figure 4] 1 shows an exemplary diagram illustrating a method for manufacturing a battery cell according to an embodiment of the present invention.

[0051] In the figures, identical reference numbers identify similar elements. The sizes and relative positions of elements in the figures are not necessarily drawn to scale, and some of these elements have been enlarged and positioned to improve legibility of the figures. Furthermore, the particular shapes of elements as drawn are not intended to convey any information regarding the actual shape of the particular elements, but have been selected merely for ease of recognition in the figures.

[0052] Unless the context requires otherwise, throughout this specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be interpreted in their open and inclusive sense, i.e., "including but not limited to."

[0053] In this description, any concentration range, percentage range, ratio range, or integer range should be understood to include any integer value within the stated range, and fractions thereof (such as tenths and hundredths of integers), where appropriate, unless otherwise specified. As used herein, the terms "about" and "approximately" mean ±20%, ±10%, ±5%, or ±1% of the indicated range, value, or structure, unless otherwise specified. As used herein, the terms "a" and "an" should be understood to refer to "one or more" of the listed components. The use of alternatives (e.g., "or") should be understood to mean one, both, or any combination thereof of the alternatives.

[0054] References throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment of the present disclosure. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. As used in this specification and claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0056] FIG. 1A shows a perspective view of an exemplary battery cell housing blank 10 according to one embodiment of the present invention. The exemplary illustrated battery cell housing blank 10 is formed as a multi-layer foil. The battery cell housing blank 10 contains aluminum or an aluminum alloy as a layer facing outward, away from the illustrated area of ​​the battery cell housing blank 10. Additional layers of the battery cell housing blank 10 may be formed as plastics, such as PP, PVC, HDPE, or nylon. Such layers may be configured as inner layers and are arranged in the visible portion of the battery cell housing blank 10 in FIG. 1A.

[0057] The battery cell housing blank 10 is configured to form a pouch-shaped battery cell housing / housing bag 20 and includes a first side 11 and a second side 12. A first cavity 31 is formed in the first side 11 of the battery cell housing blank 10 and a second cavity 32 is formed in the second side 12.

[0058] A fold edge 30 separates the first side 11 from the second side 12. The fold edges 30 are symmetrically arranged and divide the battery cell housing blank 10 into two equally sized sides or sections 11, 12.

[0059] The first cavity 31 and the second cavity 32 are formed as truncated pyramids. This shape is illustrated in the cross-sectional view of the first cavity 11 in FIG. 1B. According to the illustrated example, the first cavity 31 and the second cavity 32 have the same size and shape. However, the present invention is not limited to the illustrated exemplary embodiment. The first cavity 31 and the second cavity 32 may have different sizes, shapes, and positions within the first side 11 and the second side 12.

[0060] In the embodiment shown, both the first side 11 and the second side 12 include one third cavity 33 positioned spaced apart from the first cavity 31 and the second cavity 32 along a height axis H. The height axis H is shown, for example, in FIG.

[0061] Additionally, the first side 11 and the second side 12 each include two fourth cavities 34. The fourth cavities 34 are spaced apart from the third cavities 33 along and transverse to the height axis H.

[0062] The fourth cavity 34 has a triangular shape and is located on the four outer edges of the battery cell housing blank 10. The third cavity 33 includes an angled border facing the fourth cavity 34 to ensure an optimal fit. Additionally, the third cavity 33 is located near the outer edge in the direction of the height axis H.

[0063] In this exemplary embodiment, all of the cavities 31, 32, 33, 34 located on the first side 11 are formed identically to the cavities 31, 32, 33, 34 located on the second side 12. The cavities 31, 32, 33, 34 have tray or shell-like shapes that protrude from the joining surface 13 of the battery cell housing blank 10.

[0064] To form the as-manufactured battery cell 20, the battery cell housing blank 10 is folded along the folding edge 30 so that the first side 11 and the second side 12 are positioned adjacent to each other. The plane between the first side 11 and the second side 12 is defined as a joining surface 13 that also passes through the folding edge 30. The joining surface 13 is shown in FIG. 1A.

[0065] 2 shows an exemplary as-manufactured battery cell 20 according to one embodiment of the present invention. The cell housing blank 10 is folded along the fold edge 30 and joined, for example, via a first sealing 41 (see FIG. 3B), to form a housing bag.

[0066] The as-manufactured battery cell 20 is the battery cell 100 during manufacturing that requires absorption of the electrolyte 110 and modification to the housing bag to reach the final or finished battery cell state.

[0067] The housing bag includes at least one space 14 that incorporates a battery cell component 200. The battery cell component 200 may include an anode, a cathode, and a separator, which are rolled or folded to increase their effective area.

[0068] After filling the electrolyte solution 110 into the space 14 with the positioned battery cell components 200 and into the third cavity 33, the opening 15 of the housing bag is closed, thus forming the as-manufactured battery cell 20. Preferably, a fluid connection may remain between the third cavity 33 and the space 14.

[0069] The battery cell components 200 are positioned, for example, inside the first cavity 31 so that their poles 120 can be electrically connected to the outside of the battery cell housing blank 10. The poles 120 serve as electrical connections to the anode and cathode of the battery cell components 200, and are joined together along a joining surface 13 with the first side 11 and the second side 12.

[0070] Due to the shapes of the first cavity 31 and the second cavity 32, the initial volume of the space 14 is increased and provides the possibility of simplified positioning of the battery cell component 200 into the space 14. In the embodiment shown, the battery cell 20 in the manufactured state does not include any additional cavities.

[0071] 3A shows an exemplary as-manufactured battery cell 20 according to a further embodiment of the present invention. In contrast to the embodiment shown in FIG. 2, the as-manufactured battery cell 20 here is formed by folding and joining the battery cell housing blank 10 shown in FIG. 1A and has fourth cavities 34. Thus, after joining the sides 11, 12 of the battery cell housing blank 10, the four fourth cavities 34 form two additional spaces connected with the third cavity 33 and the space 14 containing the battery cell components 200.

[0072] These fourth cavities 34 provide additional venting potential if required by the manufacturing process of the battery cell 100 .

[0073] To provide a simplified overview, the battery cell components 200, the electrolyte 110, and the poles 120 are not shown in Figures 3A and 3B. Furthermore, the final battery cell 100 and its dimensions are visualized only schematically in Figures 2, 3A, and 3B. The final battery cell 100 is provided after cutting out the third cavity 33 and the fourth cavity 34 (if present) so that the poles protrude from the battery cell housing 130 and only the space 14 with the battery cell components 200 remains sealed.

[0074] The battery cell housing 130 is formed by the remaining portion of the battery cell housing blank 10 after removing the third cavity 33 and the fourth cavity 34 and sealing the space 14 .

[0075] To form a housing bag that can be filled with electrolyte solution 110, the folded battery cell housing blank 10 requires a first sealing 41. Figure 3B shows the as-manufactured battery cell 20 of the embodiment of Figure 3A, with the possible sealing area or sealing visualized.

[0076] In the embodiment described, all seals are formed as heat seals, which are temporary fused portions of the first side 11 and the second side 12 in the area of ​​the joining surface 13 .

[0077] By providing a first sealing 41 on two opposite edges, a battery cell housing bag is formed, which can hold the electrolyte solution 110 .

[0078] The opening 15 of the battery cell housing bag is closed at the top edge by performing a fourth seal 44. After this step, the as-manufactured battery cell 20 can be formed.

[0079] After a defined period of time, the third cavity 33 can be removed from the housing bag or as-manufactured battery cell 20 by providing a second seal 42 between the third cavity 33 and the space 14 with the battery cell component 200. Thus, the entire top of the as-manufactured battery cell 20 can be removed from the space 14. This process also forms the final battery cell 100.

[0080] If the gas components accumulated in the fourth cavity 34 are removed by forming at least one third sealing 43 that separates the at least one fourth cavity 34 from the third cavity 33, the extraction of the gas components from the interior of the space 14 can be provided in a controlled manner. This step must be performed before the second sealing 42.

[0081] 4, an exemplary diagram illustrating a method 50 for manufacturing a battery cell 100 according to one embodiment of the present invention is shown. In a first step 51 of the method 50, a battery cell housing blank 10 having a first side 11 and a second side 12 is provided.

[0082] The battery cell component 200 is positioned in the first cavity 31 and / or the second cavity 32 in a further method step 52. The poles 120 electrically connecting the battery cell component 200 overlap the edges of the first cavity 31 and / or the second cavity 32.

[0083] The battery cell housing blank 10 is then folded 53 along the folding edge 30, and a first sealing 41 is performed to enclose the battery cell component 200 within the space 14 formed by the first cavity 31 and the second cavity 32.

[0084] The entire battery housing bag is sealed 55 via the fourth sealing 44 after injecting 55 the electrolyte solution 110 into the housing bag, thus forming the as-manufactured battery cell housing 20.

[0085] During the subsequent waiting period, gas components may be vented from the space 14 into the fourth cavity 34 and the third cavity 33. Thus, in optional step 56, the fourth cavity 34 may be sealed via the third sealing 43 and removed from the third cavity 33. This step 56 may be performed multiple times depending on the number of fourth cavities 34.

[0086] After that period of time has elapsed, and after the absorption of the electrolyte solution 110 by the battery cell components 200 has finished, the second seal 42 is applied, and the third cavity 33 is removed 57 from the as-manufactured battery cell housing 20, simultaneously forming the completed battery cell 100.

Claims

1. A method (50) for manufacturing a battery cell (100), comprising: providing a battery cell housing blank (10) having a first side (11) and a second side (12), the first side (11) and the second side (12) being connected by a folding edge (30); a first cavity (31) being formed or provided in the first side (11); a second cavity (32) being formed or provided in the second side (12); the first side (11) and / or the second side (12) including at least one third cavity (33); the first side (11) and the second side (12) being folded along the folding edge (30); the first side (11) and the second side (12) are sealed along at least two edges that abut against the folded edge (30), with a remaining opening (15), a battery cell component (200) is placed inside a space (14) formed by the first cavity (31) and / or the second cavity (32), an electrolyte solution (110) is filled into the first cavity (31), the second cavity (32) and the at least one third cavity (33), the opening (15) is sealed or closed after filling the electrolyte solution (110), and gas components are vented into the at least one third cavity (33).

2. 2. The method of claim 1, wherein the electrolyte solution (110) is filled inside the space (14) between the battery cell component (200) and the cell housing blank (10) inside the first cavity (31) and the second cavity (32) through at least one third cavity (33).

3. 3. The method of claim 1, wherein after complete immersion of the battery cell component in the electrolyte solution, any remaining electrolyte solution is directed into at least one third cavity, and the at least one third cavity is removed by providing a second seal in a space formed between the third cavity and the first and second cavities, the second seal separating the third cavity from the first and second cavities, and / or the second seal providing a cut for removing the at least one third cavity from the battery cell housing.

4. 4. The method according to claim 1, wherein the first side (11) and / or the second side (12) comprises at least one third cavity (33) and at least one fourth cavity (34), and wherein the gas component is vented into the at least one fourth cavity (34) and / or into the at least one third cavity (33).

5. 4. The method according to claim 3, wherein after directing the residual electrolyte solution into the at least one third cavity, the cell housing blank in the area of ​​the first cavity and the second cavity converges against the battery cell housing part.

6. 6. The method according to claim 4, wherein the gas components accumulated in the at least one fourth cavity (34) are removed by forming at least one third sealing (43) that separates the at least one fourth cavity (34) from the at least one third cavity (33).

7. 7. The method according to any one of claims 1 to 6, wherein the at least one first seal (41), the at least one second seal (42) and / or the at least one third seal (43) are formed as heat seals by applying heat to predetermined lines or areas or paths.

8. 1. A battery cell housing blank (10), particularly formed as a single-layer or multi-layer foil or sheet, configured to form a pouch-shaped battery cell housing (130), the battery cell housing blank (10) comprising a first side (11) and a second side (12), wherein a first cavity (31) is formed in the first side (11) and a second cavity (32) is formed in the second side (12), a folding edge (30) separates the first side (11) from the second side (12), and the first side (11) and / or the second side (12) comprise at least one third cavity (33) spaced from the first cavity (31) and / or the second cavity (32) along a height axis (H).

9. 9. The battery cell housing blank of claim 8, wherein the second cavity is arranged relative to the first cavity in such a way that the second cavity is mirror-symmetrical to the first cavity, with the folding edge acting as a mirror axis.

10. 10. The battery cell housing blank of claim 8 or 9, wherein the first side (11) and / or the second side (12) includes at least one fourth cavity (34), the at least one fourth cavity (34) being spaced apart from the at least one third cavity (33) along and / or across the height axis (H), and the at least one fourth cavity (34) being formed in at least one corner of the cell housing blank (10).

11. 11. The battery cell housing blank of claim 8, wherein at least one third cavity (33) is formed adjacent to an edge of the first side (11) and / or an edge of the second side (12) that form an opening (15) for filling with an electrolyte solution (110).

12. The battery cell housing blank according to any one of claims 8 to 11, wherein the first cavity (31) and / or the second cavity (32) are formed as truncated pyramids.

13. 13. The battery cell housing blank according to any one of claims 10 to 12, wherein a space between the at least one third cavity (33) and the at least one fourth cavity (34) for providing a third sealing (43) runs in an inclined manner such that removing the at least one fourth cavity (34) removes at least one edge of the battery cell housing blank (10) along the third sealing (43) together with the at least one fourth cavity (34).

14. 14. A battery cell (20) in a manufactured state, comprising the cell housing blank (10) according to any one of claims 8 to 13, which is folded and joined to form a housing bag, and which comprises at least one space (14) for incorporating battery cell components (200), in particular an anode, a cathode, and a separator, and which comprises an electrolyte solution (110) filled inside the at least one space (14) having the battery cell components (200) and at least one third cavity (33), wherein the at least one third cavity (33) is connected to the space (14) accommodating the battery cell components (200), and the at least one third cavity (33) is configured to incorporate a gas component during the manufacture of the battery cell (100).

15. 8. An electrochemical cell (100) formed by the method (50) of any one of claims 1 to 7, comprising a pouch-shaped battery cell housing (130) having a space (14) defined by a first cavity (31) and / or a second cavity (32) that incorporates a battery cell component (200), the space (14) being sealed by at least one first sealing (41) and at least one second sealing (42) that define edges of the battery cell housing (130).

Images