Battery cell assembly

Abstract

According to exemplary embodiments of the present invention, a battery cell assembly may be provided. The battery cell assembly may comprise: a plurality of wire-type battery cells; and a plurality of cooling pipes disposed between the plurality of wire-type battery cells and each having a passage through which a cooling fluid flows.

Description

Battery cell assembly

[0001] The present invention relates to a battery cell assembly. Specifically, the present invention relates to a battery cell assembly comprising a wire-type battery cell.

[0002] This application claims the benefit of Korean application No. 10-2024-0198808, filed on December 27, 2024, which is incorporated herein by reference in its entirety.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] The trend in the technological development of rechargeable batteries for mobility is the improvement of energy density and safety. The safety of rechargeable batteries is critical as it is directly linked to the lives of passengers. The safety of rechargeable batteries can be achieved through mechanical robustness, the reliability of electrical insulation, and the delay of heat transfer in the event of a thermal runaway event.

[0005] The problem that the technical concept of the present invention aims to solve is to provide a battery cell assembly with improved performance and reliability.

[0006] The problem that the technical concept of the present invention aims to solve is to provide a battery cell assembly with enhanced safety.

[0007] According to exemplary embodiments of the present invention for solving the above-described problem, a battery cell assembly may be provided. The battery cell assembly may include a plurality of wire-type battery cells; and a plurality of cooling pipes disposed between the plurality of wire-type battery cells, each having a passage through which a cooling fluid flows.

[0008] The above plurality of cooling pipes may include a flexible material.

[0009] The plurality of cooling pipes may include at least one cooling pipe that contacts three corresponding battery cells among the plurality of wire-type battery cells.

[0010] The three battery cells in contact with the one cooling pipe can come into contact with each other.

[0011] The plurality of wire-type battery cells and the plurality of cooling pipes extend in the X direction, the plurality of wire-type battery cells are arranged in a direction intersecting the X direction, the plurality of cooling pipes are arranged in a direction intersecting the X direction, and within each of some of the plurality of cooling pipes, the cooling fluid can flow in the X direction.

[0012] In each of the cooling pipes of the remaining portion excluding the portion of the plurality of cooling pipes mentioned above, the cooling fluid can flow in the -X direction.

[0013] The plurality of wire-type battery cells comprises a central battery cell; and six outer battery cells disposed at the vertices of a first hexagonal line surrounding the central battery cell, and the plurality of cooling pipes comprises a plurality of first cooling pipes disposed at at least some of the vertices of a second hexagonal line surrounding the central battery cell, and each of the plurality of first cooling pipes can contact the central battery cell and two corresponding outer battery cells among the six outer battery cells.

[0014] The vertices of the first hexagonal line are each at a first distance from the center of the central battery cell, and the vertices of the second hexagonal line may each be at a second distance from the center of the central battery cell that is smaller than the first distance.

[0015] The plurality of cooling pipes further include a plurality of second cooling pipes disposed at at least some of the vertices of a third hexagonal line surrounding the central battery cell, and each of the vertices of the third hexagonal line may be at a third distance greater than the first distance from the center of the central battery cell.

[0016] The diameter of each of the plurality of cooling pipes may be smaller than the diameter of each of the plurality of wire-type battery cells.

[0017] Each of the plurality of wire-type battery cells may include a positive electrode and a negative electrode wound spirally; and an electrolyte.

[0018] According to exemplary embodiments of the present invention, a battery cell assembly may include a plurality of wire-type battery cells and a plurality of cooling pipes disposed between them. By doing so, the cooling performance of the battery cell assembly can be improved, the energy density can be improved, and the rapid charging performance can be improved. In addition, the increase in volume of the battery cell assembly can be minimized.

[0019] According to exemplary embodiments of the present invention, a battery cell assembly with enhanced safety can be provided.

[0020] According to exemplary embodiments of the present invention, a battery cell assembly with improved performance and reliability can be provided.

[0021] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0022] FIG. 1 is a drawing for explaining a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0023] FIG. 2 is an exploded view of a wire-type battery cell to illustrate a battery cell assembly according to exemplary embodiments of the technical concept of the present invention.

[0024] FIG. 3 is a drawing for explaining a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0025] FIG. 4 is a drawing for explaining a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0026] FIG. 5 is a drawing for explaining a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0027] FIG. 6 is a drawing for explaining a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0028] FIG. 7 is a drawing for explaining a battery cell assembly according to exemplary embodiments based on the technical concept of the present invention.

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0030] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0031] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0032] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0033]

[0034] (1st embodiment)

[0035] FIG. 1 is a drawing for explaining a battery cell assembly (100EA) according to exemplary embodiments based on the technical concept of the present invention.

[0036] FIG. 2 is an exploded view of a wire-type battery cell (100) to explain a battery cell assembly (100EA) according to exemplary embodiments of the technical concept of the present invention.

[0037]

[0038] Referring to FIG. 1, a battery cell assembly (100EA) comprising a plurality of wire-type battery cells (100) and a plurality of cooling pipes (120) may be provided.

[0039] In the embodiments, a plurality of wire-type battery cells (100) may extend in the X direction. A plurality of wire-type battery cells (100) may be arranged in a direction intersecting the X direction. Specifically, a plurality of wire-type battery cells (100) may be arranged in the Y1 direction, the Y2 direction, and the Y3 direction. Each of the plurality of wire-type battery cells (100) may be in contact with adjacent wire-type battery cells (100). Each of the plurality of wire-type battery cells (100) may have a circular (or elliptical) cross-section.

[0040] In the embodiments, a plurality of cooling pipes (120) may be disposed between a plurality of wire-type battery cells (100). Each of the plurality of cooling pipes (120) may include a passage through which a cooling fluid flows. Each of the plurality of cooling pipes (120) may come into contact with adjacent wire-type battery cells (100). For example, at least some of the plurality of cooling pipes (120) may come into contact with three adjacent wire-type battery cells (100). For example, at least some of the plurality of cooling pipes (120) may come into contact with three wire-type battery cells (100) surrounding them. For example, three wire-type battery cells (100) in contact with one cooling pipe (120) may come into contact with each other.

[0041] In the embodiments, the diameter of each of the plurality of cooling pipes (120) may be smaller than the diameter of each of the plurality of wire-type battery cells (100). For example, each of the plurality of cooling pipes (120) may have a diameter such that it is positioned between the plurality of wire-type battery cells (100).

[0042] In the embodiments, each of the plurality of cooling pipes (120) may comprise a flexible material. For example, each of the plurality of cooling pipes (120) may be composed of a flexible material, thereby forming a passage through which a cooling fluid flows. The cooling fluid may be a fluid capable of absorbing and cooling heat generated from the wire-type battery cell (100), such as air, a coolant, or cooling water, and may be included without limitation of type.

[0043]

[0044] Referring together with FIG. 2, a wire-type battery cell (100) may include an internal support (101), a first electrode (102), a separator (103), a second electrode (104), and a protective layer (105). A plurality of wire-type battery cells (100) may further include an electrolyte.

[0045] In the embodiments, the inner support (101) may comprise at least one selected from one or more spirally wound wires, one or more spirally wound sheets, hollow fibers, or mesh-type supports. The inner support (101) may have pores on its surface that allow the electrolyte to freely move to the first electrode (102) or the second electrode (104) to facilitate wetting.

[0046] For example, the above hollow fiber can be obtained by a conventional hollow fiber forming method using one or more polymers selected from the group consisting of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, polyimide, polyethylene terephthalate, polyamide imide, polyester imide, polyether sulfone, and polysulfone.

[0047] For example, the wound wire-type support may be formed in a shape such as a spring structure composed of a polymer or a metal. In this case, the polymer may be composed of a material with excellent chemical resistance that is non-reactive with the electrolyte, and examples thereof may include the same materials as those mentioned above or the polymers for binders described later. Additionally, the metal may be the same as the metal constituting the internal current collector or external current collector described later.

[0048] At this time, the diameter of the inner support (101) may be 0.1 to 10 mm, and the surface may have pores with a diameter of 100 nm to 10 μm.

[0049] In some embodiments, the inner support (101) is an open structure with a space formed inside, and an electrolyte diffusion channel may be formed on the surface facing the first electrode (102) on the outside of the inner support (101). An open structure refers to a structure in which the open structure serves as a boundary surface, and the movement of material from the inside to the outside is free through this boundary surface. Accordingly, the inflow of electrolyte can be facilitated in both directions from the inside of the inner support (101) toward the first electrode (102) and from the first electrode (102) toward the inside of the inner support (101). The open structure support (101) maintains the linear shape of the wire-type battery cell (100), prevents deformation of the structure due to external force, and prevents collapse or deformation of the electrode structure, thereby ensuring the flexibility of the wire-type battery cell (100).

[0050] In other embodiments, the internal support (101) may be a structure without an internal space, for example, the internal support (101) may be a linear wire or a twisted wire. Such a linear wire or a twisted wire may also be formed of the aforementioned polymer or metal. Here, the term "linear wire" may mean a wire shape that is linearly extended in the longitudinal direction, and the term "twisted wire" may mean a wire shape in which such a linear wire does not form an internal space and is twisted and twisted by itself.

[0051] In the embodiments, the first electrode (102) and the second electrode (104) may each be sheet-type electrodes. The sheet-type first electrode (102) may include a sheet-type first current collector and a first active material layer formed on one surface of the first current collector. Likewise, the sheet-type second electrode (104) may include a sheet-type second current collector and a second active material layer formed on one surface of the second current collector. Specifically, the first electrode (102) and the second electrode (104) may each be a positive electrode and a negative electrode. Below, we will describe the case where the first electrode (102) is a positive electrode and the second electrode (104) is a negative electrode.

[0052] The first current collector may be a positive current collector. For example, the thickness of the positive current collector may be in the range of about 3 μm to about 500 μm. The positive current collector may not cause chemical changes in the secondary battery finally manufactured and may have high conductivity. The positive current collector may include, for example, any one of stainless steel, aluminum, nickel, titanium, calcined carbon, and aluminum. The positive current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the positive current collector may include a micro-irregular structure to increase the adhesion of the active material. The shape of the positive current collector may include any one of a film, sheet, foil, net, porous material, foam, and nonwoven fabric.

[0053] The first active material layer may be a positive active material layer. The positive active material layer may include a positive active material, a conductive material, and a binder.

[0054] The above-mentioned positive active material is a material capable of causing an electrochemical reaction. The positive active material may be a lithium transition metal oxide. The positive active material may be, for example, a layered compound such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; or a material with the chemical formula LiNi 1-y M y Lithium nickel-based oxide represented by O2 (where M is any one of Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn, and Ga, and 0.01≤y≤0.7); Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2, Li 1+zN i 0.4 Mn 0.4 Co 0.2 Li like O2 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A e A lithium nickel cobalt manganese composite oxide represented by (where -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2, 0≤e≤0.2, b+c+d<1, M is any one of Al, Mg, Cr, Ti, Si and Y, and A is any one of F, P and Cl); and chemical formula Li 1+x M 1-y M' y PO 4-z X z It may include any one of the olivine-based lithium metal phosphates represented by (wherein M is a transition metal, more specifically one of Fe, Mn, Co and Ni, M' is one of Al, Mg and Ti, X is one of F, S and N, -0.5≤x≤+0.5, 0≤y≤0.5, and 0≤z≤0.1).

[0055] The above conductive material can provide conductivity without causing chemical changes in the secondary battery finally manufactured. The conductive material may include, for example, graphite such as natural graphite or artificial graphite; carbon black such as acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers or metal fibers; metal powders such as carbon fluoride, aluminum, or nickel powder; conductive whiskey such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; polyphenylene derivatives, etc.

[0056] The above binder can enhance the bonding between the active material and the conductive material and the bonding strength to the electrode plate. The binder may include, for example, polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butylene rubber, fluororubber, various copolymers, etc.

[0057] The second current collector may be a negative current collector. For example, the thickness of the negative current collector may be in the range of about 3 μm to about 500 μm. The negative current collector may not cause chemical changes in the secondary battery that is finally manufactured and may have high conductivity. The negative current collector may include any one of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, and aluminum-cadmium alloy. The negative current collector may include stainless steel surface-treated with carbon, nickel, titanium, and silver, etc. The surface of the negative current collector may include a micro-irregular structure (140) to increase the adhesion of the active material. The shape of the negative current collector may include any one of a film, sheet, foil, net, porous material, foam, and nonwoven fabric.

[0058] The second active material layer may be a negative active material layer. The negative active material layer may include a negative active material, a conductive material, and a binder. The conductive material and the binder may be the same as those described above for the anode.

[0059] The above-mentioned negative electrode active material may include carbon, for example, non-graphitizable carbon, graphite-based carbon, etc. The negative electrode active material is, for example, Li x Fe2O3(0≤x≤1), Li x WO2(0≤x≤1), Sn x Me 1-x Me y O z (wherein Me is any one of Mn, Fe, Pb, and Ge, and Me' is any one of Al, B, P, Si, Group 1, Group 2, and Group 3 elements of the periodic table, and halogens; 0 <x≤1 이고; 1≤y≤3 이며; 1≤z≤8) 등의 금속 복합 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 리튬 금속; 리튬 합금; 규소계 합금; 및 주석계 합금 중 어느 하나를 포함할 수 있다. 음극 활물질은, 예컨대, SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4및 Bi2O5등의 금속 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 폴리아세틸렌 등의 도전성 고분자; Li-Co-Ni 계 재료 등을 포함할 수도 있다.

[0060] In other embodiments, the first electrode (102) may be a negative electrode and the second electrode (104) may be a positive electrode. In this case, the first current collector may be a negative current collector, the first active material layer may be a negative active material layer, the second current collector may be a positive current collector, and the second active material layer may be a positive active material layer.

[0061] In other embodiments, unlike illustrated, the first electrode (102) and the second electrode (104) may be wire-type electrodes. When the first electrode (102) and the second electrode (104) are wire-type electrodes, the first electrode (102) and the second electrode (104) may each include a wire-type positive current collector and a wire-type negative current collector, and a positive active material layer and a negative active material layer may be formed on the surface of the wire-type positive current collector and the wire-type negative current collector, respectively. Likewise, the first electrode (102) may be a positive electrode and the second electrode (104) may be a negative electrode, or the first electrode (102) may be a negative electrode and the second electrode (104) may be a positive electrode.

[0062] In the embodiments, the separating layer (103) may be interposed between the first electrode (102) and the second electrode (104). The separating layer (103) may include a passage for the movement of an electrolyte between the first electrode (102) and the second electrode (104), or may provide an electrolyte as itself as an electrolyte layer.

[0063] In the embodiments, the protective layer (105) may be interposed on the outside of the second electrode (104) as an insulator to protect the electrode against moisture in the air and external shocks. The protective layer (105) may use, for example, a conventional polymer resin including a moisture barrier layer.

[0064] In the embodiments, a pouch layer may be further interposed on the inner side of the protective layer (105). The pouch layer may comprise a moisture barrier layer made of a metal such as aluminum, an insulating layer formed on one side of the moisture barrier layer and formed of a polyester such as PET or a polyimide such as nylon, and a heat sealing layer formed on the other side of the moisture barrier layer and formed of polypropylene, polycarbonate, polyethylene, etc.

[0065] In the embodiments, a first electrode (102) may be spirally wound on the outside of an inner support (101), a separating layer (103) may be spirally wound on the outside of the first electrode (102), and a second electrode (104) may be spirally wound on the outside of the separating layer (103). A protective layer (105) may be formed on the outside of the second electrode (104) and may wrap the remaining components.

[0066] In the embodiments, the wire-type battery cell (100) may have mechanical flexibility. For example, the protective layer (105) may include a flexible material.

[0067]

[0068] The battery cell assembly (100EA) described with reference to FIGS. 1 and 2 may include a plurality of wire-type battery cells (100) and a plurality of cooling pipes (120) disposed between them. By doing so, the performance of cooling the plurality of wire-type battery cells (100) can be improved.

[0069] In particular, as the number of wire-type battery cells (100) constituting the battery cell assembly (100EA) increases, it may not be easy to dissipate heat generated from the inner wire-type battery cells (100) by cooling from the outside by convection. However, if a cooling pipe (120) is placed between a plurality of wire-type battery cells (100) according to embodiments of the technical concept of the present invention, the wire-type battery cells (100) can be cooled regardless of their location, even if the number of wire-type battery cells (100) constituting the battery cell assembly (100EA) increases. That is, the cooling performance of the battery cell assembly (100EA) can be improved.

[0070] Accordingly, the energy density of the battery can be improved by increasing the number of wire-type battery cells (100) constituting the battery cell assembly (100EA) while maintaining cooling performance. In addition, as cooling performance is improved, charging with a higher current is possible, thereby improving rapid charging performance.

[0071] In addition, a plurality of wire-type battery cells (100) constituting the battery cell assembly (100EA) are in line contact to form a space between them, and if a cooling pipe (120) is placed in that space, there is no need to create a separate space for cooling, or it can be minimized.

[0072] In addition, the cooling pipe (120) can maintain the flexibility of the battery cell assembly (100EA) as it includes a flexible material.

[0073]

[0074] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with improved cooling performance, improved energy density, and improved rapid charging performance may be provided. In addition, a battery cell assembly (100EA) including a cooling pipe (120) and with minimized volume increase may be provided.

[0075] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with enhanced safety can be provided.

[0076]

[0077] (2nd Example)

[0078] FIG. 3 is a drawing for explaining a battery cell assembly (100EA) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 3 is a drawing showing a virtual first hexagonal line (HL1) to explain the battery cell assembly (100EA).

[0079] FIG. 4 is a drawing for explaining a battery cell assembly (100EA) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 4 is a drawing showing a virtual second hexagonal line (HL2) to explain the battery cell assembly (100EA).

[0080] FIG. 5 is a drawing for explaining a battery cell assembly (100EA) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 5 is a drawing showing a virtual third hexagonal line (HL3) to explain the battery cell assembly (100EA).

[0081]

[0082] Hereinafter, with reference to FIGS. 1 and FIGS. 3 to 5 together, the arrangement of a plurality of wire-type battery cells (100) and a plurality of cooling pipes (120) of a battery cell assembly (100EA) will be described in detail.

[0083] As illustrated in FIG. 3, a plurality of wire-type battery cells (100) may include a central battery cell (100C) and a plurality of outer battery cells (100P1 to 100P6) surrounding it. Specifically, a plurality of outer battery cells (100P1, 100P2, 100P3, 100P4, 100P5, and 100P6, hereinafter 100P1 to 100P6) may be arranged at the vertices of a first hexagonal line (HL1) surrounding the central battery cell (100C).

[0084] For example, six outer battery cells (100P1 to 100P6) may be placed at the vertices of a first hexagonal line (HL1) surrounding a central battery cell (100C). For example, the center (PC1, PC2, PC3, PC4, PC5, and PC6, hereinafter PC1 to PC6) of each outer battery cell (100P1 to 100P6) may be placed at the vertices of the first hexagonal line (HL1).

[0085] In the embodiments, the vertices of the first hexagonal line (HL1) may each be at a first distance (D1) from the center (CC1) of the central battery cell (100C). For example, the center (PC1~PC6) of each of the outer battery cells (100P1~100P6) may be at a first distance (D1) from the center (CC1) of the central battery cell (100C).

[0086] Six outer battery cells (100P1 to 100P6) each contact the central battery cell (100C) and can contact two other adjacent outer battery cells (100P1 to 100P6). For example, the first outer battery cell (100P1) can contact the central battery cell (100C), and the second outer battery cells (100P2) and the sixth outer battery cell (100P6) on both sides. For example, the second outer battery cell (100P2) can contact the central battery cell (100C), and the first outer battery cells (100P1) and the third outer battery cell (100P3) on both sides. For example, the third outer battery cell (100P3) can contact the central battery cell (100C), and the second outer battery cells (100P2) and the fourth outer battery cell (100P4) on both sides. For example, the fourth outer battery cell (100P4) may be in contact with the center battery cell (100C), and the third outer battery cells (100P3) and fifth outer battery cells (100P5) on both sides. For example, the fifth outer battery cell (100P5) may be in contact with the center battery cell (100C), and the fourth outer battery cells (100P4) and sixth outer battery cells (100P6) on both sides. For example, the sixth outer battery cell (100P6) may be in contact with the center battery cell (100C), and the first outer battery cells (100P1) and fifth outer battery cells (100P5) on both sides.

[0087] As illustrated in FIG. 4, a plurality of cooling pipes (120) may include a first cooling pipe (121) positioned at the vertices of a second hexagonal line (HL2) surrounding a central battery cell (100C). Specifically, the first cooling pipe (121) may be positioned at least some of the vertices of the second hexagonal line (HL2) surrounding the central battery cell (100C).

[0088] For example, six first cooling pipes (121) may be placed at the vertices of a second hexagonal line (HL2) surrounding a central battery cell (100C). For example, the center of each of the first cooling pipes (121) may be placed at the vertices of the second hexagonal line (HL2).

[0089] In this specification, six first cooling pipes (121) are exemplified as being placed at the vertices of a second hexagonal line (HL2) surrounding a central battery cell (100C), but the first cooling pipes (121) may be placed at only some of the vertices of the second hexagonal line (HL2). For example, one to five first cooling pipes (121) may be placed at some of the vertices of the second hexagonal line (HL2).

[0090] In the embodiments, the vertices of the second hexagonal line (HL2) may each be at a second distance (D2) from the center (CC1) of the central battery cell (100C). For example, the center of each of the first cooling pipes (121) may be at a second distance (D2) from the center (CC1) of the central battery cell (100C).

[0091] In the embodiments, the second distance (D2) may be smaller than the first distance (D1). In other words, the first cooling pipes (121) may be placed between the central battery cell (100C) and the outer battery cells (100P1 to 100P6).

[0092] In the embodiments, the first cooling pipes (121) each contact the central battery cell (100C) and may contact two corresponding outer battery cells among the six outer battery cells (100P1 to 100P6). For example, the first cooling pipes (121) each contact the central battery cell (100C) and may contact two adjacent outer battery cells (100P1 to 100P6). For example, one first cooling pipe (121) may contact the central battery cell (100C), the first outer battery cell (100P1), and the second outer battery cell (100P2) surrounding it. For example, one first cooling pipe (121) may contact the central battery cell (100C), the second outer battery cell (100P2), and the third outer battery cell (100P3) surrounding it. For example, one first cooling pipe (121) may come into contact with the surrounding central battery cell (100C), third outer battery cell (100P3), and fourth outer battery cell (100P4). For example, one first cooling pipe (121) may come into contact with the surrounding central battery cell (100C), fourth outer battery cell (100P4), and fifth outer battery cell (100P5). For example, one first cooling pipe (121) may come into contact with the surrounding central battery cell (100C), fifth outer battery cell (100P5), and sixth outer battery cell (100P6). For example, one first cooling pipe (121) may come into contact with the surrounding central battery cell (100C), sixth outer battery cell (100P6), and first outer battery cell (100P1).

[0093] In the embodiments, three wire-type battery cells in contact with one first cooling pipe (121) may come into contact with each other. For example, a central battery cell (100C), a first outer battery cell (100P1), and a second outer battery cell (100P2) in contact with one first cooling pipe (121) may come into contact with each other. For example, a central battery cell (100C), a second outer battery cell (100P2), and a third outer battery cell (100P3) in contact with one first cooling pipe (121) may come into contact with each other. For example, a central battery cell (100C), a third outer battery cell (100P3), and a fourth outer battery cell (100P4) in contact with one first cooling pipe (121) may come into contact with each other. For example, a central battery cell (100C), a fourth outer battery cell (100P4), and a fifth outer battery cell (100P5) in contact with a first cooling pipe (121) can be in contact with each other. For example, a central battery cell (100C), a fifth outer battery cell (100P5), and a sixth outer battery cell (100P6) in contact with a first cooling pipe (121) can be in contact with each other. For example, a central battery cell (100C), a sixth outer battery cell (100P6), and a first outer battery cell (100P1) in contact with a first cooling pipe (121) can be in contact with each other.

[0094] As illustrated in FIG. 5, the plurality of cooling pipes (120) may further include second cooling pipes (122) positioned at the vertices of the third hexagonal line (HL3) surrounding the central battery cell (100C). Specifically, the second cooling pipes (122) may be positioned at least some of the vertices of the third hexagonal line (HL3) surrounding the central battery cell (100C).

[0095] For example, six second cooling pipes (122) may be placed at the vertices of the third hexagonal line (HL3) surrounding the central battery cell (100C). For example, the center of each second cooling pipe (122) may be placed at the vertices of the third hexagonal line (HL3).

[0096] In this specification, six second cooling pipes (122) are illustrated as being placed at the vertices of the third hexagonal line (HL3) surrounding the central battery cell (100C), but the second cooling pipes (122) may be placed at only some of the vertices of the third hexagonal line (HL3). For example, one to five second cooling pipes (122) may be placed at some of the vertices of the third hexagonal line (HL3).

[0097] In the embodiments, the vertices of the third hexagonal line (HL3) may each be at a third distance (D3) from the center (CC1) of the central battery cell (100C). For example, the center of each of the second cooling pipes (122) may be at a third distance (D3) from the center (CC1) of the central battery cell (100C).

[0098] In the embodiments, the third distance (D2) may be greater than the first distance (D1). In other words, with respect to the central battery cell (100C), the second cooling pipes (122) may be positioned further outward than the first cooling pipes (121).

[0099]

[0100] The battery cell assembly (100EA) described with reference to FIGS. 1, 3 to 5 may include a plurality of wire-type battery cells (100) and a plurality of cooling pipes (120) between them. Accordingly, a plurality of cooling pipes (120) can be placed between a plurality of wire-type battery cells (100) without the need to create a separate space for placing the plurality of cooling pipes (120).

[0101] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with improved cooling performance, improved energy density, and improved rapid charging performance may be provided. In addition, a battery cell assembly (100EA) including a cooling pipe (120) and with minimized volume increase may be provided.

[0102] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with enhanced safety can be provided.

[0103]

[0104] (3rd Example)

[0105] FIG. 6 is a drawing for explaining a battery cell assembly (100EA) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 6 shows only some components of the battery cell assembly (100EA) to explain the flow direction of the cooling fluid within the cooling pipe (120).

[0106] Referring to FIG. 1 and FIG. 6 together, a wire-type battery cell (100) and a plurality of cooling pipes (120) can extend in the X direction. The plurality of cooling pipes (120) surround a single wire-type battery cell (100) in the Y1 direction, Y2 direction, and Y3 direction, and can be arranged in the Y1 direction, Y2 direction, and Y3 direction.

[0107] In the embodiments, a cooling fluid may flow in one direction within a plurality of cooling pipes (120). Specifically, a cooling fluid may flow in the X direction within a plurality of cooling pipes (120). For example, a cooling fluid may flow in the X direction within a plurality of cooling pipes (120) surrounding a single wire-type battery cell (100).

[0108] For example, a cooling fluid may flow in the X direction within a cooling pipe (120) to cool a wire-type battery cell (100). The cooling fluid may absorb heat from the wire-type battery cell (100), causing its temperature to rise or its state to change. For example, as the cooling fluid flows in the X direction, its temperature may rise or its state may change.

[0109] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with improved cooling performance may be provided.

[0110] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with enhanced safety can be provided.

[0111]

[0112] (Fourth Example)

[0113] FIG. 7 is a drawing for explaining a battery cell assembly (100EA) according to exemplary embodiments of the technical concept of the present invention. Specifically, FIG. 7 shows only some components of the battery cell assembly (100EA) to explain the flow direction of the cooling fluid within the cooling pipe (120).

[0114] Referring to FIG. 1 and FIG. 7 together, a wire-type battery cell (100) and a plurality of cooling pipes (120) can extend in the X direction. The plurality of cooling pipes (120) surround a single wire-type battery cell (100) in the Y1 direction, Y2 direction, and Y3 direction, and can be arranged in the Y1 direction, Y2 direction, and Y3 direction.

[0115] In the embodiments, a cooling fluid may flow in a specific direction within a plurality of cooling pipes (120). Specifically, a cooling fluid may flow in the X direction within some of the cooling pipes (120). A cooling fluid may flow in the -X direction within some of the cooling pipes (120). For example, a cooling fluid may flow in the X direction within a plurality of cooling pipes (120) surrounding a single wire-type battery cell (100).

[0116] For example, a cooling fluid may flow in the X direction within some of the cooling pipes (120) to cool the wire-type battery cell (100). The cooling fluid may absorb heat from the wire-type battery cell (100), causing its temperature to rise or its state to change. For example, as the cooling fluid flows in the X direction, its temperature may rise or its state may change.

[0117] For example, a cooling fluid may flow in the -X direction within the remaining portion of the cooling pipe (120) to cool the wire-type battery cell (100). The cooling fluid may absorb heat from the wire-type battery cell (100), causing its temperature to rise or its state to change. For example, as the cooling fluid flows in the -X direction, its temperature may rise or its state may change. By doing so, the heat from the wire-type battery cell (100) can be absorbed evenly.

[0118] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with improved cooling performance may be provided.

[0119] According to embodiments of the technical concept of the present invention, a battery cell assembly (100EA) with enhanced safety can be provided.

[0120]

[0121] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. Multiple wire-type battery cells; and A battery cell assembly comprising a plurality of cooling pipes disposed between the plurality of wire-type battery cells, each having a passage through which a cooling fluid flows.

2. In Paragraph 1, A battery cell assembly comprising a plurality of cooling pipes including a flexible material.

3. In Paragraph 1, A battery cell assembly comprising at least one cooling pipe that contacts three corresponding battery cells among the plurality of wire-type battery cells.

4. In Paragraph 3, A battery cell assembly in which the three battery cells in contact with the one cooling pipe are in contact with each other.

5. In Paragraph 1, The plurality of wire-type battery cells and the plurality of cooling pipes extend in the X direction, and The plurality of wire-type battery cells are arranged in a direction intersecting the X direction, and The plurality of cooling pipes mentioned above are arranged in a direction intersecting the X direction, and A battery cell assembly in which, within each of some of the plurality of cooling pipes, the cooling fluid flows in the X direction.

6. In Paragraph 5, A battery cell assembly in which, within each of the cooling pipes of the plurality of cooling pipes excluding the portion mentioned above, the cooling fluid flows in the -X direction.

7. In Paragraph 1, The above plurality of wire-type battery cells are, central battery cell; and It includes six outer battery cells positioned at the vertices of a first hexagonal line surrounding the central battery cell, and The plurality of cooling pipes includes a plurality of first cooling pipes disposed at at least some of the vertices of the second hexagonal line surrounding the central battery cell, and A battery cell assembly in which the plurality of first cooling pipes each contact the central battery cell and two corresponding outer battery cells among the six outer battery cells.

8. In Paragraph 7, The vertices of the first hexagonal line are each at a first distance from the center of the central battery cell, and A battery cell assembly in which the vertices of the second hexagonal line are each located at a second distance smaller than the first distance from the center of the central battery cell.

9. In Paragraph 8, The plurality of cooling pipes further include a plurality of second cooling pipes disposed at at least some of the vertices of the third hexagonal line surrounding the central battery cell, and A battery cell assembly in which the vertices of the third hexagonal line are each at a third distance greater than the first distance from the center of the central battery cell.

10. In Paragraph 1, A battery cell assembly in which the diameter of each of the plurality of cooling pipes is smaller than the diameter of each of the plurality of wire-type battery cells.

11. In Paragraph 1, Each of the multiple wire-type battery cells is, Anode and cathode wound in a spiral; and Battery cell assembly containing an electrolyte.

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