Pouch-shaped secondary battery

Abstract

Featuring a pouch-shaped secondary battery: an electrode arrangement; and a pouch-shaped battery case, the pouch-shaped battery case features: a tray section configured to accommodate the electrode arrangement, wherein the tray section extends in a longitudinal direction and in a lateral direction perpendicular to it; a first closure section, which is arranged on one of two sides of the tub section perpendicular to the longitudinal direction; and a second closure section, which is arranged on another side of the tub section perpendicular to the width direction, wherein the electrode arrangement and the pouch-shaped battery housing are configured such that the A / B ratio is 0.29 or greater when A is an area of ​​the first closure section in mm² 2 is and B is the weight of the electrode arrangement in g.

Description

REFERENCE TO RELATED REGISTRATIONS

[0001] This application claims priority over Korean patent application No. 10-2022-0121205, which was filed with the Korean Intellectual Property Office on September 23, 2022. TECHNICAL AREA

[0002] The present invention relates to a pouch secondary battery. STATE OF THE ART

[0003] Secondary batteries can be provided in various configurations and dimensions. One known type is the pouch-shaped secondary battery, in which an electrode array is housed in a pouch-shaped casing. Another known type is the can-shaped secondary battery, in which an electrode array is housed in a can.

[0004] Compared to a can-shaped secondary battery, a pouch-shaped secondary battery can provide a higher energy density in terms of volume and / or weight. However, it may be desirable to increase its mechanical strength, particularly its resistance to external shocks and stresses. More generally, it may be desirable to enhance the safety of a pouch-shaped secondary battery.

[0005] With the increasing diversification of secondary battery operating environments, it is desirable to enhance the durability and safety of secondary batteries, particularly for use in harsh environments. Specifically, it is desirable to increase the shock resistance of pouch-type secondary batteries. SUMMARY OF THE INVENTION

[0006] The technical problems known from the prior art are solved by the present invention as defined by the features of the independent claims. Specific examples of the present invention are given by the features of the dependent claims. In particular, the present invention can help to prevent displacement of an electrode arrangement and / or leakage of electrolyte from a pouch-shaped secondary battery, even when subjected to an external shock.

[0007] A pouch-shaped secondary battery may be provided. The pouch-shaped battery may include an electrode assembly and a pouch-shaped battery case. The pouch-shaped battery case may include a well section, a first closure section, and a second closure section. The well section may be configured to accommodate the electrode assembly. The well section may extend in a longitudinal direction and in a lateral direction perpendicular to the longitudinal direction. The first closure section is located on one of two sides of the well section perpendicular to the longitudinal direction. The second closure section may be located on the other side of the well section perpendicular to the lateral direction. The electrode assembly and the pouch-shaped battery case may be configured such that the A / B ratio is 0.29 or greater, where A is an area of ​​the first closure section in square millimeters (mm²). 2) is. B is the weight of the electrode assembly in grams (g). In other words, the ratio of the area of ​​the first closure section in mm² to the weight of the electrode assembly in g can be 0.29 or more.

[0008] In an optional example, a pouch-shaped secondary battery can be provided, comprising an electrode assembly and a pouch-shaped battery case. The pouch-shaped battery case can include a well section configured to accommodate the electrode assembly, a pair of first closure sections arranged longitudinally on either side of the well section, and a second closure section configured to join the pair of first closure sections together, arranged laterally on one side of the well section. If an area (surface area) of the first closure section is A mm² 2If the weight of the electrode arrangement is B g, then the ratio A / B can be approximately 0.29 or more.

[0009] Here, the area of ​​the first closure section can refer to a surface (area) in a top view (i.e., perpendicular to the lateral and longitudinal directions; see also the detailed description below) in a mathematical sense. The lateral direction can be parallel to the horizontal direction unless otherwise specified or technically impractical. The longitudinal direction can be parallel to the vertical direction unless otherwise specified or technically impractical.

[0010] The pouch-shaped secondary battery, as disclosed herein, can contribute to increasing the durability of a pouch-shaped battery, and in particular of a pouch-shaped battery casing therein, against external mechanical stress, such as shock, shock, vibration, etc. Specifically, the pouch-shaped secondary battery, as disclosed herein, can contribute to preventing the pouch-shaped battery casing from cracking or tearing, thereby reducing the risk of electrolyte leakage from the pouch-shaped battery casing. Furthermore, the pouch-shaped secondary battery, as disclosed herein, can contribute to preventing unwanted movement (i.e., away from an intended arrangement) of the electrode arrangement within and / or even out of the pouch-shaped battery casing. Thus, the pouch-shaped secondary battery, as disclosed herein, can contribute to preventing displacement of the electrode arrangement.The above technical effects can be further enhanced by implementing one of the optional features described in detail below.

[0011] The pouch-shaped secondary battery can be manufactured by depositing an active electrode material onto a positive electrode substrate and a negative electrode substrate to create a positive and a negative electrode. The electrode array can be obtained by stacking the positive and negative electrodes with a separator between them. The electrode array can then be placed within a pouch-shaped battery casing, and an electrolyte can be added.

[0012] The pouch-shaped secondary battery casing can be manufactured by pressing a flexible laminate (flexible pouch film stack) to form a well section. After placing an electrode array in the well section and injecting an electrolyte into both the electrode array and the well section, a closure section of the flexible pouch film stack can be tightly sealed. The pouch-shaped secondary battery can thus be obtained.

[0013] The terms "pouch-shaped secondary battery", "pouch-shaped battery", and "battery" may be used interchangeably in the following text unless otherwise specified or technically inappropriate. Similarly, the terms "pouch-shaped secondary battery housing" and "battery housing" may be used interchangeably unless otherwise specified or technically inappropriate.

[0014] The electrode arrangement as disclosed herein may refer to a stack of layers having one or more positive electrodes, one or more separators and one or more negative electrodes alternately.

[0015] The pouch-shaped battery housing, as disclosed herein, may refer to a flexible film or laminate that is deformed to accommodate the electrode assembly. In particular, the pouch-shaped battery housing may be provided as a flexible laminate that is initially planar and is deformed, for example by pressing and / or drawing, so that the well section is formed within the flexible laminate.

[0016] The term "trough section," as used herein, may refer to a recess formed in the pouch-shaped battery case. The trough section may be formed as a planar projection extending outward in an outward direction from the initially planar flexible laminate of the pouch-shaped battery case. The pouch-shaped battery case may be substantially planar, except for the trough section. In particular, the trough section may refer to a trough-shaped recess formed in the pouch-shaped battery case. The trough section may have a substantially planar main surface and one or more side walls. The main surface is offset from the remainder of the initially planar flexible laminate of the pouch-shaped battery case. The one or more side walls surround the main surface of the trough section and extend from the main surface of the trough section to the remainder of the pouch-shaped battery case.Thus, the remainder of the pouch-shaped battery housing can surround the well section. The well section can have a substantially rectangular shape in a plan view, i.e., in a viewing direction perpendicular to the main surface of the well section, whereby the corners may be rounded by design and / or due to manufacturing requirements. The well section can therefore have four side walls extending from each of the four sides of the planar main surface to the remainder of the pouch-shaped battery housing. Alternatively or additionally, the well section can be configured, in particular shaped and dimensioned, to accommodate the electrode array (i.e., according to the shape and dimensions of the electrode array).

[0017] In this context, the electrode array can have a rectangular shape when viewed from above. The top view can also refer to a viewing direction perpendicular to the layers (i.e., the entirety of the electrodes and separator(s)) of the electrode array. In a rectangular shape, two opposite sides are of equal length and parallel to each other. Here, the longitudinal direction can refer to a direction parallel to the longer sides of the rectangular shape of the electrode array, and the transverse direction can refer to a direction parallel to the shorter sides. Thus, the longitudinal direction, the transverse direction, and the viewing direction of the top view can all be perpendicular to each other.

[0018] Additionally or alternatively, the basin section accommodating the electrode array can have a rectangular shape in plan view. The plan view can be perpendicular to the main planar surface of the basin section, as described above. The longitudinal direction can be parallel to the longer sides of the rectangular basin section, and the lateral direction can be parallel to the shorter sides. The longitudinal direction, the lateral direction, and the plan view can be perpendicular to each other.

[0019] In general, each of the first closure section, the second closure section, and the additional first closure section, as used herein, can refer to a surface of the pouch-shaped battery case used to close the pouch-shaped battery case in a fluid-tight manner. In particular, the pouch-shaped battery case can be foldable such that one half of the pouch-shaped battery case rests on another half of the same. The halves of the pouch-shaped battery case can be fused together at each of the first closure section, the second closure section, and the additional first closure section under heat and / or pressure to close the pouch-shaped battery case, in particular the basin section thereof, in a fluid-tight manner.

[0020] The first closure section of the tub section can be located on either of the two sides of the tub section that extend perpendicular to the longitudinal direction. In other words, the first closure section of the tub section can be located on either of the two shorter sides of the tub section. As such, the first closure section can be located on a side of the tub section that extends parallel to the transverse direction. The shorter sides can refer to the sides of the rectangular tub section that extend in (i.e., essentially parallel to) the transverse direction. The first closure section can have an elongated shape in plan view. In particular, the first closure section can be subdivided into several sections that extend in different directions.In specific examples, the first closure section may have a strip-like or ribbon-like shape in plan view, whereby a width (measured perpendicular to a longitudinal direction of the first closure section) may be constant or may vary along the longitudinal direction of the first closure section.

[0021] As discussed below, the pouch-shaped battery casing may have an additional first sealing section. The first sealing section is located on one of the shorter sides of the tub section, and the additional first sealing section may be located on the opposite side.

[0022] The second closure section of the tub section can be located on either of the two sides of the tub section that extend perpendicular to the width direction. In other words, the second closure section of the tub section can be located on either of the two longer sides of the tub section. As such, the second closure section can be located on a side of the tub section that extends parallel to the length direction. The longer sides can refer to the sides of the rectangular tub section that extend in (i.e., substantially parallel to) the length direction. The second closure section can have an elongated shape in plan view. In particular, the second closure section can be subdivided into several sections that extend in different directions.In specific examples, the second closure section may have a strip-like or band-like shape in plan view, whereby a width (measured perpendicular to a longitudinal direction of the second closure section) may be constant or may vary along the longitudinal direction of the second closure section.

[0023] The pouch-shaped secondary battery, in particular the first closure section and the electrode arrangement in relation to each other, can be provided such that the ratio of the area of ​​the first closure section in mm 2 the weight of the electrode assembly in grams is 0.29 or more. This specific condition can contribute to the effect described above of increasing the durability of the pouch battery, in particular by preventing tearing or rupture of the pouch battery casing.

[0024] The ratio of the area of ​​the first closure section in mm 2 The weight of the electrode assembly in grams can be approximately 0.37 or less. The A / B ratio can range from 0.29 to 0.37. The specific range of this ratio can contribute to increasing the durability of the pouch-type secondary battery. In some examples, the ratio of the area of ​​the first closure section in mm² 2 the weight of the electrode arrangement in g may be 0.29 to 0.35 or 0.29 to 0.33 or 0.29 to 0.32, with the effect indicated above being stronger in that order.

[0025] The pouch-shaped battery case may further include an additional first closure section. This additional first closure section may be located on the other of the two sides of the well section, perpendicular to its longitudinal direction. The electrode arrangement and the pouch-shaped battery case are configured such that the C / B ratio is 0.29 or greater, where C represents the area of ​​the additional first closure section in mm². 2 where B is the weight of the electrode assembly in g. In other words, the pouch-shaped battery can be provided such that the area of ​​the additional first closure section in mm² is a ratio of . 2 the weight of the electrode assembly in g is 0.29 or more.

[0026] As mentioned above, the first sealing section can be located on one of the shorter sides of the basin section, and the additional first sealing section can be located on the opposite side. The specific condition that applies to the first sealing section can also be applied to the additional first sealing section, so that the technical effect described above can also be achieved in the additional first sealing section. In particular, the first sealing section can have a section through which an electrode lead runs from the electrode array of the basin section to the outside of the pouch-shaped battery casing. Any, some, or all of the features and specifications of the first sealing section disclosed herein can also apply to the additional first sealing section, unless otherwise specified or technically impractical.

[0027] The pouch-shaped battery casing may further include a gas pocket section located between the well section and the first closure section. The gas pocket section may be configured to receive gas emitted by the electrode assembly.

[0028] A gas can be generated as a result of chemical reactions that may occur during the manufacture or operation of the battery. Here, the term "gas," as used in this context, collectively encompasses any gas or gas mixture that can be generated in the battery. The gas pocket section can provide an area or volume between the sump section and the first closure section to temporarily or (quasi-)permanently store the gas generated in the battery. The containment of the gas in the gas pocket section, i.e., in a gas-tight manner, can be ensured, at least in part, by the fluid-tight seal provided by the first closure section. The gas pocket section can help suppress pressure build-up within the battery.

[0029] Additionally or alternatively, an additional gas pocket section can be provided between the basin section and the additional first closure section. The additional gas pocket section can be configured to receive the gas emitted by the electrode assembly. The additional gas pocket section can implement any, some, or all of the features of the gas pocket section disclosed herein. In particular, the containment of any gas in the additional gas pocket section can be ensured, at least partially, by a fluid-tight seal provided by the additional first closure section.

[0030] The gas pocket section can have a shape that tapers outwards in the longitudinal direction from the electrode assembly. In plan view, the gas pocket section can have a polygonal base shape, for example, a trapezoidal base shape, with one or more sides being linear or curved. In particular, the gas pocket section can have a base adjacent to the well section and can be shaped to taper outwards to a section of the first closure section through which an electrode lead passes from the electrode assembly, which is received in the well section, to the outside of the pouch-shaped battery casing. In particular, the shape of the gas pocket section can be determined by the shape of the first closure section in plan view.

[0031] The first closure section can extend, at least partially, in a direction that is not parallel to the width direction. As described above, the first closure section can have an elongated shape along a longitudinal direction. The longitudinal direction can change along the first closure section. The first closure section can have one or more sections where the longitudinal direction is parallel to the width direction. The first closure section can have one or more other sections where the longitudinal direction is not parallel to the width direction.

[0032] The first closure section can be a strip extending along one or more arcs, curves, lines, and / or any combination thereof. As described above, the first closure section can be elongated, and the strip shape is one example of this. It should be noted that the width of the first closure section, measured perpendicular to its longitudinal direction, can be constant or vary along its length. The same can apply accordingly to the additional first closure section.

[0033] The battery may further comprise an electrode lead that is electrically connected to the electrode assembly. The electrode lead may protrude from the pouch-shaped battery casing through a portion of the first closure section. The electrode lead may conform to the description above. In particular, the electrode assembly may have an (electrode) tab that protrudes from a stack of electrodes and separator(s), and the electrode lead may be physically (i.e., directly) and / or electrically connected to the tab. The portion of the first closure section through which the electrode lead protrudes may be linear or curved.

[0034] The ratio of the minimum distance between the first closure section and the electrode array in the longitudinal direction to the length of the electrode array (i.e., the dimension of the electrode array in the longitudinal direction) can range from 0.005 to 0.008. In other words, the minimum distance between the first closure section and the electrode array in the longitudinal direction of the basin section can range from approximately 0.5% to approximately 0.8% of the length of the electrode array. This can provide a volume to buffer a gas generated in the electrode array, as described above in relation to the gas pocket section.

[0035] The pouch-shaped battery casing can further comprise a first casing section, a second casing section, and a folding section. The first casing section and the second casing section can each be configured to accommodate the electrode assembly on and from opposite sides thereof. The folding section can be formed between the first casing section and the second casing section and extend linearly along the longitudinal direction. The pouch-shaped battery casing can be folded around the folding section to enclose the electrode assembly between the first and second casing sections. The first closure section can extend from the folding section in a direction that is not parallel to the lateral direction.

[0036] Additionally, the extra first closure section can extend from the folding section in a direction that is not parallel to its width. The second closure section can extend from the first closure section to the extra first closure section. In particular, the second closure section can be physically connected to both the first closure section and the extra first closure section, thus forming a connection and extending between them. The second closure section can extend from an end of the first closure section that is distal to the folding section. The second closure section can be formed on one side of the pouch-shaped battery housing opposite the folding section.

[0037] In the longitudinal direction, the minimum distance between the first closure section and the electrode array at the second closure section can be smaller than the minimum distance between the first closure section and the electrode array at the fold section. If the fold section is a continuous section, while the first and second closure sections are fused sections, the closure strength at the fold section is higher than at both the first and second closure sections. It has been found that a smaller gap between the first closure section and the electrode array near the second closure section than near the fold section increases the overall closure strength of the pouch-shaped battery case.

[0038] The first closure section can further comprise a first section, a second section, and a third section. The first section can extend from the second closure section. The electrode lead can protrude from the pouch-shaped battery housing through the second section. The third section can extend from the second section to the folding section. The second section can form a connection between the first section and the third section. The length of the first section can be greater than the length of the third section. The inventors have found that such a configuration further increases the closure strength of the pouch-shaped battery housing, thereby increasing the durability of the pouch-shaped battery as a whole.

[0039] Alternatively, the first closure section may include: a first section connected to the second closure section, in which a distance from the basin section increases in the longitudinal direction of the basin section as it moves away from the second closure section; and a second section connected to the first section, from which an electrode lead protrudes, connected to the electrode assembly.

[0040] A minimum distance between the first section and the electrode arrangement in the longitudinal direction of the trough section can range from about 0.5% to about 0.8% of the length of the electrode arrangement.

[0041] Optionally, the pouch-shaped battery casing can have a folding section located on the opposite side of the second closure section, relative to the basin section, to connect the pair of first closure sections. Each of the first closure sections can further have a third section configured to connect the second section to the folding section, with a distance from the basin section increasing along the longitudinal direction of the basin section as it moves further away from the folding section.

[0042] A minimum distance between the first section and the electrode arrangement in the longitudinal direction of the tub section can be smaller than a minimum distance between the third section and the electrode arrangement.

[0043] The first section can have a length greater than that of the third section.

[0044] According to another aspect, a pouch-shaped secondary battery can be provided. The pouch-shaped secondary battery can include an electrode assembly and a pouch-shaped battery case. The pouch-shaped battery case can include a basin section, a pair of first closure sections, and a second closure section. The basin section can be configured to accommodate the electrode assembly. The basin section can extend in a longitudinal direction and in a transverse direction perpendicular to it. The pair of first closure sections can each be located on one of two sides of the basin section perpendicular to the longitudinal direction. The second closure section can be located on one side of the basin section perpendicular to the transverse direction, with the second closure section connecting between the pair of first closure sections.A minimum distance between the first closure section and the electrode arrangement in the longitudinal direction of the basin section is approximately 0.5% or more compared to the length of the electrode arrangement.

[0045] Any one of the pouch-shaped battery housing, the basin section, and the second closure section can be as described above and can implement any, some, or all of the respective features disclosed herein. The pair of first closure sections can correspond, with respect to the first closure section and the additional closure section, as described above and can implement any, some, or all of the respective features disclosed herein.

[0046] In certain examples, the smallest distance between the first closure section and the electrode array in the longitudinal direction is approximately 0.8% or less with respect to the length of the electrode array.

[0047] In certain examples, if an area of ​​the first closure section A mm 2 is and the weight of the electrode arrangement B is g, the ratio A / B is between 0.29 and 0.37.

[0048] According to another aspect, a pouch-shaped secondary battery is provided, comprising an electrode assembly and a pouch-shaped battery case. The pouch-shaped battery case may include a basin section configured to receive the electrode assembly, a pair of first closure sections arranged longitudinally on both sides of the basin section, and a second closure section configured to connect the pair of first closure sections and arranged laterally on one side of the basin section. A minimum longitudinal distance between the first closure section and the electrode assembly of the basin section may be approximately 0.5% or more of the length of the electrode assembly.

[0049] The minimum distance between the first closure section and the electrode array in the longitudinal direction of the basin section may be approximately 0.8% or less compared to the length of the electrode array.

[0050] If an area of ​​the first closure section A mm 2 Given that the electrode arrangement weighs B g, the A / B ratio can range from approximately 0.29 to approximately 0.37. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which: Fig. 1 is an exploded view of a pouch-shaped secondary battery according to an example; Fig. 2. A top view of the pouch-shaped secondary battery according to an example; and Fig. 3 is an enlarged partial top view of a pouch-shaped secondary battery according to another example. DETAILED DESCRIPTION OF PREFERRED EXECUTION FORMS

[0052] Preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, so that the person skilled in the art can easily carry out the present invention. However, the present invention can be implemented in several different forms and is not limited or restricted by the following examples.

[0053] For the sake of brevity and to avoid redundancy, reference is made to the features already described above without repeating them below. It is noted that, generally, each of the features described above can also be implemented in the examples described below with reference to the drawings, unless otherwise specified or technically inappropriate. To clearly explain the present invention, detailed descriptions of sections irrelevant to the description or related known technologies that might unnecessarily obscure the core of the present invention have been omitted, and reference numerals are added to the components in each drawing throughout this description. In this case, identical or similar reference numerals are assigned to the same or similar elements throughout the entire description.

[0054] Furthermore, terms or expressions used in this description and the claims should not be interpreted restrictively as ordinary or dictionary-based meanings, but should be interpreted as meanings and concepts that correspond to the scope of the present invention on the basis of the principle that an inventor can correctly define the concept of a term in order to best describe and explain his invention.

[0055] Fig. Figure 1 is an exploded view of a pouch-shaped secondary battery.

[0056] A pouch-shaped secondary battery 1 may comprise an electrode array 10 and a pouch-shaped battery casing 20 (hereinafter referred to as the "battery casing"). In particular, the pouch-shaped secondary battery 1 may implement any, some, or all of the features of the pouch-shaped secondary battery as described above, unless otherwise specified or technically impractical.

[0057] The electrode assembly 10 can be provided by alternately stacking a positive electrode and a negative electrode with a separator between them. That is, the electrode assembly 10 can have multiple electrodes and a separator positioned between the multiple electrodes to isolate them from one another. The electrode assembly 10 can be accommodated together with an electrolyte in the battery housing 20, in particular a well section 22, as will be described in detail later. The electrode assembly 10, the pouch-shaped battery housing 20, and the well section 22 can each implement any, some, or all of the respective features described above, unless otherwise specified or technically impractical.

[0058] The electrode arrangement 10 includes, but is not limited to, a stack type, a jelly roll type, a stack and fold type, and the like.

[0059] The electrode assembly 10 can have an electrode tab 11. The electrode tab 11 can be connected to each of the positive and negative electrodes of the electrode assembly 10 in order to project outwards from the electrode assembly 10, thus serving as a path through which electrons move into and out of the electrode assembly 10.

[0060] The electrode tab 11 can be provided by cutting a non-coating section or by joining a separate conductive element to the non-coating section by ultrasonic welding.

[0061] The multiple electrode tabs 11 can comprise a positive electrode tab 111, which is connected to the positive electrode, and a negative electrode tab 112, which is connected to the negative electrode. Although the electrode tabs 111 each project in different directions from the electrode arrangement 10, the embodiment of the present invention is not limited thereto. For example, the electrode tabs can project in different directions, for instance, parallel to each other, projecting from one side in the same direction.

[0062] An electrode lead 12, which supplies electricity to the outside of the secondary battery 1, can be connected to the electrode tab 11 of the electrode assembly 10 by spot welding or the like. Additionally, a section of the electrode lead 12 can be surrounded by an insulating section 14. The insulating section 14 can be arranged to be confined to terrace sections 23 and 26, to which the first housing 20a and the second housing 20b of the battery housing 20 are thermally fused. Therefore, the insulating section 14 can insulate the electrode lead 12 from the battery housing 20 and maintain the closure of the battery housing 20. Although generally an insulating tape, which can be easily attached to the electrode lead 12 and has a relatively thin thickness, is primarily used as the insulating section 14, the present invention is not limited to this.For example, various elements can be used as the insulating section 14, as long as the elements are capable of insulating the electrode lead 12. The electrode lead 12 can implement any, some, or all of the features of the electrode lead as described above, unless otherwise specified or technically impractical.

[0063] The electrode lead 12 can have one end connected to the electrode tab 11 and the other end extending to the outside of the battery casing 13. The electrode lead 12 can have a positive electrode lead 121 connected to the positive electrode tab 111 and a negative electrode lead connected to the negative electrode tab 112.

[0064] The electrode lead 12 can electrically connect the electrode arrangement 10 to the outside. Since each of the positive electrode tabs 111 and the negative electrode tabs 112 is designed to project in different directions, each of the positive electrode leads 121 and the negative electrode leads 122 can extend in different directions.

[0065] The battery housing 20 can accommodate the electrode assembly 10 and can be formed by forming a laminate film. More precisely, when the flexible laminate film is drawn and shaped using a die and a punch, a section of the battery housing 20 can be stretched to form a basin section 22, which has a pocket-shaped receiving space, thus producing the battery housing 20.

[0066] The battery housing 20 can accommodate the electrode assembly 10, so that a section of the electrode lead 12 is exposed and can then be closed. The battery housing 20 can have a pair of housings 20a and 20b, more precisely a first housing 20a and a second housing 20b.

[0067] The first housing 20a and the second housing 20b can be connected to each other by a folding section 21. However, this is not the only option, and it is also possible for the first housing 20a and the second housing 20b to be separated and manufactured independently. The folding section 21 can implement any, some, or all of the features of the folding section as described above, unless otherwise specified or technically impractical.

[0068] The basin section 22 can be provided in at least one of the pair of housings 20a and 20b to provide a receiving space capable of accommodating the electrode assembly 10. The basin section 22 can have a recessed shape.

[0069] The following describes, as an example, an enclosure in which the basin section 22 is provided in each of the enclosures 20a and 20b. A person skilled in the art will also be able to easily understand the enclosure in which the basin section 22 is provided in only one of the pair of enclosures 20a and 20b.

[0070] The well sections 22 of the pair of housings 20a and 20b can be arranged facing each other and can accommodate the electrode assembly 10. In this case, the battery housing 20 can accommodate the electrode assembly 10, which has a greater thickness and a greater capacity, compared to the housing in which the well section 22 is provided in only one of the pair of housings 20a and 20b.

[0071] The first housing 20a and the second housing 20b can be connected to each other by the folding section 21. If the basin section 22 is provided in each of the housings 20a and 20b, one section of the folding section 21 can be located between the basin section 22 of the first housing 20a and the basin section 22 of the second housing 20b, and the other section of the folding section 21 can be arranged between a first terrace section 23 of the first housing 20a and a first terrace section 23 of the second housing 20b. The first terrace section 23 is described later.

[0072] The folding section 21 can extend parallel to a longitudinal direction (e.g., a direction parallel to an X-axis) of the electrode arrangement 10. When the folding section 21 is folded, the first housing 20a and the second housing 20b can face each other.

[0073] The housings 20a and 20b can have the terrace sections 23 and 26, respectively, arranged around the basin section 22. More precisely, the terrace sections 23 and 26 can have a pair of first terrace sections 23, arranged on both sides of the basin section 22 in a longitudinal direction (e.g., parallel to the X-axis), and a second terrace section 23, connecting the pair of first terrace sections 23, and arranged on one side of the basin section 22 in a transverse direction (e.g., parallel to a Y-axis).

[0074] The second terrace section 26 can be arranged on an opposite side of the folding section 21 with respect to the tub section 22. If the first housing 20a and the second housing 20b are separate elements not connected to each other by the folding section 21, the second terrace section 26 can be arranged on both sides of the tub section 22 in the width direction.

[0075] When the folding section 21 is folded, the terrace sections 23 and 26 of the first housing 20a and the second housing 20b can be in contact with each other. Here, the insulating section 14 of the electrode arrangement 10 can be positioned between the terrace sections 23 and 26 of the pair of housings 20a and 20b. For example, the insulating section 14 can be positioned between the first terrace sections 23 of the pair of housings 20a and 20b.

[0076] Fig. Figure 2 is a top view of the pouch-shaped secondary battery. Fig. Figure 3 is an enlarged partial view of a pouch-shaped secondary battery from above. The in Fig. 2 and Fig. The three examples shown can implement any, some or all of the features as described above, unless otherwise specified or technically inappropriate.

[0077] The battery housing 20 can have a pair of first locking sections 24 arranged longitudinally on both sides of the tub section 22, and a second locking section 27 connecting the pair of first locking sections 24 and arranged laterally on one side of the tub section. One of the pair of first locking sections 24 can be implemented as the first locking section, as described above, and the other of the pair of first locking sections 24 can be implemented as the additional locking section, as described above. Thus, each first locking section 24 can implement any, some, or all of the respective features as described above, unless otherwise specified or technically impractical.The second shutter section 27 can also implement any, some or all of the features of the second shutter section as described above, unless otherwise specified or technically inappropriate.

[0078] The closure sections 24 and 27 can be sections that are closed together in a state where the first housing 20a and the second housing 20b are in contact. More precisely, the first closure section 24 can be provided by partially closing outer sections of the first terrace sections 23 of the pair of housings 20a and 20b together. Similarly, the second closure section 27 can be provided by partially closing outer sections of the second terrace sections 26 of the pair of housings 20a and 20b together.

[0079] Each first locking section 24 can connect the folding section 21 with the second locking section 27. Thus, the battery housing 20 can be closed by the pair of first locking sections 24 and second locking sections 27.

[0080] The width of both the first closure section 24 and the second closure section 27 can be essentially constant, but is not limited to this.

[0081] The first shutter section 24 may have a first section 241 and a second section 242. The first shutter section 24 may further have a third section 243. The first, second, and third sections 241, 242, 243 of the first shutter section may implement any, some, or all of the respective features as described above, unless otherwise specified or technically impractical.

[0082] The first section 241 can be connected to the second closure section 27. The distance between the first section 241 and the basin section 22 can increase in the longitudinal direction of the basin section 22 the further it is from the second closure section 27. That is, the first section 241 can extend in an oblique or curved direction with respect to the lateral direction of the basin section 22.

[0083] The second section 242 can be connected to the first section 241. The electrode lead 12 can protrude from the second section 242. More precisely, an insulating section 14, which insulates the electrode lead 12, can be arranged between the second sections 242 and the first closure sections 24 of the pair of housings 20a and 20b. A constant interval can be maintained between the second section 242 and the basin section 22. That is, the second section 242 can extend parallel to the lateral direction of the basin section 22.

[0084] The third section 243 can connect the second section 242 to the folding section 21. Since the third section 243 is further away from the folding section 21, the distance between the third section 243 and the tub section 22 can increase along the entire longitudinal direction of the tub section 22. That is, the third section 243 can extend in an oblique or curved direction with respect to the lateral direction of the tub section 22.

[0085] The length of the first section 241 can be greater than that of the third section 243. The length of the second section 242 can be greater than that of the third section 243.

[0086] In the longitudinal direction of the trough section 22, a minimum distance d1 between the first section 241 and the electrode arrangement 10 can be smaller than a minimum distance d2 between the third section 243 and the electrode arrangement 10.

[0087] Due to the configuration of the first closure section 24, a space in the battery module, which accommodates several pouch-shaped secondary batteries 1, can be used efficiently.

[0088] The second closure section 27 can be folded at least once towards the basin section 21. For example, the second closure section 27 can be double-folded (DSF). As a result, the energy density of the pouch-shaped secondary battery 1 can increase.

[0089] The battery housing 20 may further comprise a gas pocket section 25, which is arranged between the basin section 22 and the first closure section 24.

[0090] The gas pocket section 25 can be internal sections that are not sealed to each other at the first terrace sections 23 of the pair of housings 20a and 20b. Since the interior of the gas pocket section 25 is connected to the receiving space of the basin section 22, a gas generated in the electrode arrangement 10 can be received in both the gas pocket section 25 and the basin section 22. The gas pocket section 25 can implement any, some, or all of the features of the gas pocket section as described above, unless otherwise specified or technically impractical.

[0091] The battery housing 20 may further have an open section 28 which is arranged between the basin section 22 and the second closure section 27.

[0092] The unsealed section 28 can be internal sections that are not sealed to each other at the second terrace sections 26 of the pair of housings 20a and 20b. Because of the unsealed section 28, a high-temperature sealing tool for forming the second sealing section 27 can be prevented from being too close to the basin section 22 and affecting the electrode arrangement 10.

[0093] The unsealed section 28 can be connected to the gas pocket section 25. Gas generated in the electrode arrangement 10 can also be absorbed in the unsealed section 28; however, since the width of the unsealed section 28 is very narrow compared to the gas pocket section 25, its actual gas absorption capacity may be insufficient.

[0094] The battery housing 20 may further comprise an under-closure section 29, which is connected to the first closure section 24 and is provided by closing a partial outer section of the folding section 21. More precisely, the under-closure section 29 may be provided by closing a section of the folding section 21 that is located between the first terrace sections 23 of the pair of housings 20a and 20b. The under-closure section 29 may extend approximately parallel to the longitudinal direction of the basin section 22. The under-closure section 29 may have a predetermined interval with respect to the basin section 22.

[0095] The overall sealing strength of the battery housing 20 can be further improved by the under-seal section 29.

[0096] As demand for high-capacity batteries, such as those used in electric vehicles, has increased recently, the nominal capacity of pouch-type secondary batteries has also increased, and consequently, the size and weight of the electrode assembly tend to increase as well. However, as the size and weight of the electrode assembly increase, an external shock can exacerbate a phenomenon where the pouch-type battery casing is damaged or the electrode assembly is forced into the pouch-type battery casing as it moves. If the pouch-type battery casing is damaged, electrolyte can leak, or the electrode assembly can be deformed, causing serious limitations in battery performance and safety.

[0097] To overcome the limitation where the electrode arrangement 10 is deflected from its original position in order to damage or penetrate the battery housing 20, in the pouch-shaped secondary battery 1 according to an embodiment of the present invention, a specific condition can be met by a ratio of the area of ​​the first closure section 24 to the weight of the electrode arrangement 10.

[0098] More precisely, in the pouch-shaped secondary battery 1 according to an embodiment of the present invention, if the area of ​​the first closure section is 24 A mm² and the weight of the electrode arrangement is 10 B g, the A / B ratio can be greater than or equal to approximately 0.29. That is, the area (mm²) 2 ) of each first closure section 24 may be approximately 0.29 times greater than the weight g of the electrode arrangement 10.

[0099] Since inertia increases as the weight of the electrode assembly 10 increases, there is a high risk of damaging the battery housing 20 through the electrode assembly 10 when the external shock is applied.

[0100] Additionally, although the force varies depending on the direction in which the external shock is applied, because each first closure section 24 has a length that is shorter than that of the second closure section 27, when the external shock is applied, a load applied by the electrode arrangement 10 to the first closure section 24 can be greater than a load applied to the second closure section 27. Consequently, the risk of damage to or penetration of the first closure section 24 is greater than that of the second closure section 27.

[0101] Therefore, in order to improve the shock resistance, the area of ​​the first closure section 24 must increase if the electrode arrangement 10 is heavier.

[0102] If the area (mm 2 Since the weight of the first closure section 24 is approximately 0.29 times smaller than the weight g of the electrode assembly 10, there is a risk that, if an external shock is applied to the pouch-shaped secondary battery 1, the electrode assembly 10 may damage the battery housing 20 or allow the electrode assembly 10 to penetrate the battery housing 20.

[0103] Additionally, to prevent the area of ​​the first closure section 24 from being excessively widened in order to reduce the energy density of the pouch-shaped secondary battery 1, the area (mm²) 2 The weight (g) of the first closure section 24 is approximately 0.37 times smaller than the weight (g) of the electrode arrangement 10. This means that the A / B ratio can range from approximately 0.29 to approximately 0.37.

[0104] If the area (mm 2 Since the area of ​​the first closure section 24 is approximately 0.37 times larger than the weight g of the electrode arrangement 10, the energy density of the pouch-shaped secondary battery may be too low, as the area of ​​the first closure section 24 is unnecessarily widened. Additionally, as the size of the pouch-shaped secondary battery 1 increases, it may be difficult to secure sufficient space within the battery module that accommodates the multiple pouch-shaped secondary batteries 1.

[0105] In the following, a pouch-shaped secondary battery 1 according to another embodiment of the present invention is described with reference to the Fig. 1 to Fig. 3 described, and content duplicated with that described above is cited.

[0106] In the pouch-shaped secondary battery 1 according to another embodiment of the present invention, in order to overcome a limitation that a battery housing 20 may be damaged or penetrated when an electrode arrangement 10 is deflected from its original position due to an external impact, a ratio of a minimum distance d1 between a first closure section 24 and the electrode arrangement 10 in a longitudinal direction of a basin section 22 to a length L of the electrode arrangement 10 may satisfy a specific condition.

[0107] In another embodiment of the present invention, the minimum distance d1 (hereinafter referred to as an interspace distance) between the first closure section 24 and the electrode arrangement 10 in the longitudinal direction of the basin section 22 can be approximately 0.5% or more in the pouch-shaped secondary battery 1.

[0108] As described above, since the minimum distance d1 between a first section 241 and the electrode arrangement 10 in the longitudinal direction of the trough section 22 is smaller than a minimum distance d2 between a third section 243 and the electrode arrangement 10, the interspace distance d1 can mean that there is a minimum distance between the first section 241 of the first closure section 24 and the electrode arrangement 10.

[0109] Since the size of the electrode arrangement 10 increases with increasing length L of the electrode arrangement 10, there is a high risk of damaging a battery housing 20 through the electrode arrangement 10 if an external shock is received.

[0110] Additionally, since the gap distance d1 is a distance by which the electrode arrangement is deflected from its original position to reach the first closure section, increasing the gap distance can reduce the risk of damaging the first closure section with the electrode arrangement.

[0111] Therefore, in order to achieve excellent shock resistance, the spacing d1 must increase with increasing length L of the electrode arrangement 10.

[0112] If the gap d1 is less than about 0.5% of the total length L of the electrode assembly 10, the electrode assembly 10 may damage or penetrate the battery housing 20 if an external shock is applied to the pouch-shaped secondary battery 1.

[0113] Additionally, to prevent the energy density of the pouch-shaped secondary battery 1 from being reduced due to an excessive increase in the gap spacing d1, the gap spacing d1 can be approximately 0.8% or less of the total length L of the electrode arrangement 10. That is, the gap spacing d1 can be approximately 0.5% to approximately 0.8% of the total length L of the electrode arrangement 10.

[0114] If the spacing d1 is greater than approximately 0.8% of the total length L of the electrode assembly 10, the length of the electrode assembly 10 may be too short, or the length of the battery housing 20 may be too long, and thus the energy density of the pouch-shaped secondary battery 1 may be too low. Additionally, as the size of the pouch-shaped secondary battery 1 increases, it may be difficult to secure sufficient space within the battery module that accommodates the multiple pouch-shaped secondary batteries 1.

[0115] The ratio condition of the area of ​​the first closure section to the weight of the electrode arrangement 10 according to one embodiment of the present invention and a ratio condition of the ratio condition of the gap distance d and the length L of the electrode arrangement 10 according to another embodiment of the present invention cannot be alternative, and the pouch-shaped secondary battery 1 can satisfy both conditions.

[0116] According to the preferred embodiment of the present invention, the specific condition can be satisfied by the ratio of the area of ​​the first sealing section of the battery casing to the weight of the electrode assembly, or by the ratio of the minimum distance between the first sealing section and the electrode assembly to a length of the electrode assembly, or by both specific conditions being satisfied. Thus, when an external shock is applied, the risk of damage to or ingress of the first sealing section due to the electrode assembly can be reduced, and separation of the electrode assembly and / or leakage of the electrolyte can be suppressed to achieve the excellent shock resistance.

[0117] In addition, the effects that are obvious to the person skilled in the art can be predicted based on the configurations according to the embodiment of the present invention.

[0118] The subject matter disclosed above is to be regarded as illustrative and not limiting, and the attached claims are intended to cover all such modifications, improvements and other embodiments which fall within the true spirit and scope of the present disclosure.

[0119] Therefore, the embodiment of the present invention is to be regarded as illustrative and not limiting, and the technical spirit of the present invention is not limited to the foregoing embodiment.

[0120] Therefore, the scope of the present disclosure is not defined by the detailed description of the invention, but by the attached claims, and any differences within the scope are to be interpreted as being included in the present disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2022-0121205

[0001]

Claims

[1] Having a pouch-shaped secondary battery: an electrode arrangement; and a pouch-shaped battery case, the pouch-shaped battery case features: a tray section configured to accommodate the electrode arrangement, wherein the tray section extends in a longitudinal direction and in a lateral direction perpendicular to it; a first closure section, which is arranged on one of two sides of the tub section perpendicular to the longitudinal direction; and a second closure section, which is arranged on another side of the tub section perpendicular to the width direction, wherein the electrode arrangement and the pouch-shaped battery housing are configured such that the A / B ratio is 0.29 or greater when A is an area of ​​the first closure section in mm² 2 is and B is the weight of the electrode arrangement in g. [2] Pouch-shaped secondary battery according to claim 1, wherein the ratio A / B is 0.37 or less. [3] Pouch-shaped secondary battery according to claim 1 or 2, wherein the pouch-shaped battery housing further comprises: an additional first closure section, which is arranged on the other of the two sides of the tub section perpendicular to the longitudinal direction, wherein the electrode arrangement and the pouch-shaped battery housing are configured such that the C / B ratio is 0.29 or greater when C is an area of ​​the additional first closure section in mm² 2 is and B is the weight of the electrode arrangement in g. [4] Pouch-shaped secondary battery according to one of the preceding claims, wherein the pouch-shaped battery housing further comprises a gas pocket section arranged between the basin section and the first closure section, wherein the gas pocket section is configured to contain a gas emitted by the electrode arrangement. [5] Pouch-shaped secondary battery according to claim 4, wherein the gas pocket section has a shape that tapers outwards in the longitudinal direction from the electrode arrangement. [6] Pouch-shaped secondary battery according to one of the preceding claims, wherein the first closure section extends at least partially in a direction that is not parallel to the width direction. [7] Pouch-shaped secondary battery according to any of the preceding claims, wherein the first closure section has a strip shape extending along one or more arcs, one or more curves, one or more lines and / or a combination of any of the foregoing. [8] Pouch-shaped secondary battery according to any one of the preceding claims, further comprising: an electrode lead that is electrically connected to the electrode assembly, wherein the electrode lead extends through a section of the first closure section from the pouch-shaped battery casing. [9] Pouch-shaped secondary battery according to one of the preceding claims, wherein the ratio of a minimum distance between the first closure section and the electrode arrangement in the longitudinal direction to a length of the electrode arrangement is between 0.005 and 0.

008. [10] Pouch-shaped secondary battery according to any of the preceding claims, wherein the pouch-shaped battery housing further comprises: a first housing section and a second housing section, each accommodating the electrode arrangement on and from opposite sides thereof; a folding section formed between the first housing section and the second housing section, wherein the folding section extends linearly along the longitudinal direction, wherein the pouch-shaped battery housing is foldable around the folding section to enclose the electrode arrangement between the first housing section and the second housing section, wherein the first closure section extends from the folding section in a direction that is not parallel to the width direction. [11] Pouch-shaped secondary battery according to claim 10, wherein in the longitudinal direction a smallest distance between the first closure section and the electrode arrangement on the second closure section is smaller than a smallest distance between the first closure section and the electrode arrangement on the folding section. [12] Pouch-shaped secondary battery according to claim 10 or 11, wherein the first closure section comprises: a first section extending from the second closure section; a second section through which an electrode lead protrudes from the pouch-shaped battery casing; a third section extending from the second section to the folding section, where the second section establishes a connection between the first section and the third section, where the length of the first segment is greater than the length of the third segment. [13] Having a pouch-shaped secondary battery: an electrode arrangement; and a pouch-shaped battery case, the pouch-shaped battery case features: a tray section configured to accommodate the electrode arrangement, wherein the tray section extends in a longitudinal direction and in a lateral direction perpendicular to it; a pair of first closure sections, each arranged on one of two sides of the tub section perpendicular to the longitudinal direction; and a second closure section arranged on one side of the tub section perpendicular to the width direction, the second closure section connecting between the pair of first closure sections, wherein a minimum distance between the first closure section and the electrode arrangement in the longitudinal direction of the basin section is approximately 0.5% or more compared to the length of the electrode arrangement. [14] Pouch-shaped secondary battery according to claim 13, wherein a minimum distance between the first closure section and the electrode arrangement in the longitudinal direction is about 0.8% or less of the length of the electrode arrangement. [15] Pouch-shaped secondary battery according to claim 13 or 14, wherein, if an area of ​​the first closure section A mm 2 where the weight of the electrode arrangement B is g, and the ratio A / B is between 0.29 and 0.37.

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