Linear secondary battery and battery pack including same

Abstract

The invention provides a linear secondary battery and a battery pack including the same. A linear secondary battery according to an embodiment of the present invention comprises: a conductive wire body having a linear shape extending in an axial direction; the one or more cells are arranged to wrap at least part of the surface of the conductor wire main body and comprise an anode, a solid electrolyte and a cathode; and the insulating coating layer is arranged to wrap the conductor wire main body and the battery core.

Description

Technical Field

[0001] The technical concept of this invention relates to secondary batteries, and more specifically, to linear secondary batteries and battery packs including thereon. Background Technology

[0002] Recently, the market for small batteries in IT devices such as smartphones, tablets, and laptops, as well as non-IT devices like power tools and even gardening tools, has continued to grow. Meanwhile, the development prospects are even broader as small batteries are used in various fields, such as wireless headphones, smartwatches, smart glasses, drones, electric bicycles, electric scooters, electric skateboards, and robots. Furthermore, with the development of Internet of Things (IoT) integrated device technology, the use of wireless sensors is gradually increasing globally, thus expanding the thin-film battery market.

[0003] Solid-state batteries, as the next generation of rechargeable batteries, use a solid electrolyte between the anode and cathode, rather than a liquid. Typically, for widely used rechargeable batteries, namely lithium-ion batteries, liquid electrolytes offer excellent energy efficiency but have a relatively short lifespan. Furthermore, the electrolyte is a flammable liquid, increasing the risk of explosion at high temperatures. Conversely, solid-state batteries, with their solid electrolytes, eliminate the problem of liquid leakage due to external impacts. They also do not contain flammable materials, resulting in a lower risk of fire and making them relatively safer. Moreover, solid-state batteries offer advantages over lithium-ion batteries, including higher energy density, shorter charging time, the ability to achieve large capacities, and the potential for flexible battery design.

[0004] However, existing batteries are cylindrical, square, pouch-shaped, coin-shaped, etc., which have limitations due to their large size when used in wearable electronic devices. Moreover, the dendrites growing on the lithium anode penetrate the separator and connect to the cathode, causing a short circuit, thus posing limitations such as fire and even explosion. Summary of the Invention

[0005] [Technical Issues] The technical concept of this invention is to provide a linear secondary battery and a battery pack including the same.

[0006] However, the technical problems described are merely exemplary, and the technical concept of the present invention is not limited thereto.

[0007] [Technical Solution] According to one aspect of the present invention, a linear secondary battery and a battery pack including the thereof are provided.

[0008] According to one embodiment of the present invention, the linear secondary battery may include: a conductive wire body having a linear shape extending along an axial direction; one or more cells arranged to wrap at least a portion of the surface of the conductive wire body and including an anode, a solid electrolyte, and a cathode; and an insulating coating layer arranged to wrap the conductive wire body and the cells.

[0009] According to one embodiment of the present invention, the anode may be arranged to wrap around the outer surface of the conductive wire body and be electrically connected to the conductive wire body, the solid electrolyte may be arranged to wrap around the outer surface of the anode, the cathode may be arranged to wrap around the outer surface of the solid electrolyte, and may further include a current collector layer arranged to wrap around the outer surface of the cathode and be electrically connected to the cathode.

[0010] According to one embodiment of the present invention, the conductive wire body may contain at least one of gold (Au), silver (Ag), copper (Cu), aluminum (Al), tin (Sn), palladium (Pd), bismuth (Bi), indium (In), zinc (Zn), antimony (Sb) and their alloys, the anode may contain lithium, the solid electrolyte may contain lithium phosphorus nitrogen oxide, and the cathode may contain lithium cobalt oxide.

[0011] According to one embodiment of the present invention, the cathode may be arranged to wrap around the outer surface of the conductive wire body and be electrically connected to the conductive wire body, the solid electrolyte may be arranged to wrap around the outer surface of the cathode, the anode may be arranged to wrap around the outer surface of the solid electrolyte, and may further include a current collector layer arranged to wrap around the outer surface of the anode and be electrically connected to the anode.

[0012] According to one embodiment of the present invention, the battery pack may include: a plurality of linear secondary batteries; a connecting portion for electrically connecting the plurality of linear secondary batteries; and a sealing portion for sealing the plurality of linear secondary batteries.

[0013] According to an embodiment of the present invention, the plurality of linear secondary batteries may include: a first linear secondary battery comprising: a first conductive wire body having a linear shape extending along an axial direction; one or more first cells respectively arranged to wrap at least a portion of the surface of the first conductive wire body, and including a first anode, a first solid electrolyte, and a first cathode; and a first insulating coating layer arranged to wrap the first conductive wire body and the first cells; and a second linear secondary battery comprising: a second conductive wire body having a linear shape extending along an axial direction; one or more second cells respectively arranged to wrap at least a portion of the surface of the second conductive wire body, and including a second anode, a second solid electrolyte, and a second cathode; and a second insulating coating layer arranged to wrap the second conductive wire body and the cells.

[0014] According to an embodiment of the present invention, the connecting portion may include: a first connecting portion for electrically connecting the first conductive wire body and the second conductive wire body; and a second connecting portion for electrically connecting the first battery cell and the second battery cell.

[0015] According to one embodiment of the present invention, a portion of the first insulating coating layer and the second insulating coating layer are each removed, exposing a portion of the first battery cell and the second battery cell respectively, so as to be electrically connected to the second connecting portion.

[0016] According to one embodiment of the present invention, the plurality of linear secondary batteries can be connected in parallel.

[0017] According to an embodiment of the present invention, the connecting portion may include: a third connecting portion electrically connected to the first battery cell; a fourth connecting portion for electrically connecting the first conductive wire body and the second battery cell; and a fifth connecting portion electrically connected to the second conductive wire body.

[0018] According to one embodiment of the present invention, the plurality of linear secondary batteries can be connected in series.

[0019] According to one embodiment of the present invention, the battery pack may be formed by weaving the plurality of linear secondary batteries in one direction to form a unidirectional woven fiber structure, or the plurality of linear secondary batteries may be formed by weaving in two directions to form a bidirectional woven fiber structure including at least one of plain weave, twill weave, satin weave, or honeycomb weave.

[0020] [Beneficial Effects] According to the technical concept of the present invention, the battery pack is composed of multiple linear secondary batteries whose outer surfaces are covered by an insulating coating and electrically connected. Even if some of the linear secondary batteries are short-circuited, the battery pack can still continue to operate, providing integrity and minimizing the risk of the entire battery pack catching fire or exploding. Moreover, since the linear secondary batteries have a small diameter and a long axis linear shape, they can be applied to smart glasses with long axes, etc., providing power while also serving as supporting feet.

[0021] The effects of the present invention described above are merely illustrative, and the scope of the present invention is not limited by these effects. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the appearance of a linear secondary battery according to an embodiment of the present invention.

[0023] Figure 2 This is a cross-sectional view of a linear secondary battery according to an embodiment of the present invention.

[0024] Figure 3 This is a cross-sectional view of a linear secondary battery according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of a battery pack according to an embodiment of the present invention.

[0026] Figure 5 These are detailed illustrations of embodiments of the present invention. Figure 4 Cross-sectional view of the battery pack.

[0027] Figure 6 This is a schematic diagram of a linear secondary battery connected in series in a battery pack according to an embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram illustrating the stability of a battery pack according to an embodiment of the present invention.

[0029] Figure 8 and Figure 9 This is a schematic diagram of a battery pack according to an embodiment of the present invention.

[0030] Figures 10a to 10e This is a schematic diagram of a braided battery pack according to an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram illustrating the application fields of the battery pack according to an embodiment of the present invention. Detailed Implementation

[0032] Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0033] The embodiments of the present invention are provided to more fully illustrate the invention to those skilled in the art. The following embodiments can be modified into various other forms, and the scope of the invention is not limited to these embodiments. Rather, these embodiments make the disclosure more substantial and complete, and convey the inventive concept more fully to those skilled in the art.

[0034] Throughout this specification, the same symbols denote the same components. The thickness or size of each layer in the drawings may be exaggerated for ease of explanation and accuracy. Furthermore, deformations of the shapes illustrated in the drawings can be anticipated based on manufacturing techniques and / or tolerances. Therefore, embodiments of the invention should not be construed as limited to specific shapes within the areas illustrated in this specification; for example, they should include shape deformations that occur during the manufacturing process.

[0035] Throughout this instruction manual, it should be noted that the meaning of "electrical connection" includes situations where components are in physical or direct contact, as well as situations where there are other components in between, encompassing all situations where electrical connections are made in various ways.

[0036] Figure 1This is a schematic diagram of the appearance of a linear secondary battery 10 according to an embodiment of the present invention.

[0037] Figure 2 This is a cross-sectional view of the linear secondary battery 10 according to an embodiment of the present invention.

[0038] Figure 2 The attached diagram on the left is along Figure 1 The cross-sectional view cut along the AA cutting line is shown in the attached diagram on the right. Figure 1 A cross-sectional view of the section cut by the BB cutting line.

[0039] Reference Figure 1 and Figure 2 The linear secondary battery 10 includes a conductive wire body 20 and a battery cell 30 arranged inside.

[0040] The conductive wire body 20 may have a linear shape extending along an axial direction. The conductive wire body 20 may have a first region 22 and a second region 24. The conductive wire body 20 may have a diameter ranging from 0.02 mm to 5.0 mm, for example, from 0.02 mm to 1.0 mm. The conductive wire body 20 may have various cross-sectional shapes, such as circular, elliptical, semi-circular, triangular, quadrilateral, etc. The conductive wire body 20 may contain a conductor and may contain a metal, such as at least one of gold (Au), silver (Ag), copper (Cu), aluminum (Al), tin (Sn), palladium (Pd), bismuth (Bi), indium (In), zinc (Zn), antimony (Sb), and their alloys.

[0041] The battery cell 30 may be arranged to cover at least a portion of the surface of the conductive wire body 20, specifically, to cover the surface of the first region 22. Therefore, the first region 22 of the conductive wire body 20 may have the battery cell 30 arranged therein, while the second region 24 may not have the battery cell 30 arranged therein. The number of battery cells 30 may be one or more. Figure 1 and Figure 2 The illustration shows two battery cells 30, but this is merely an example, and the technical concept of the present invention is not limited thereto.

[0042] The cell 30 may include an anode 40, a solid electrolyte 50, and a cathode 60, thus enabling it to function as a secondary battery.

[0043] The anode 40 may be arranged to cover the outer surface of the conductive wire body 20 and may be electrically connected to the conductive wire body 20. The anode 40 may contain lithium (Li). The anode 40 may have a thickness in the range of 10 nm to 10 μm, for example, in the range of 10 nm to 1 μm.

[0044] The solid electrolyte 50 may be arranged to enclose the outer surface of the anode 40 and may be electrically connected to the anode 40. The solid electrolyte 50 may be sandwiched between the anode 40 and the cathode 60. The solid electrolyte 50 may, for example, contain lithium phosphorus oxide (LiPON). The solid electrolyte 50 may, for example, have a thickness in the range of 10 nm to 10 μm, or for example, a thickness in the range of 10 nm to 1 μm.

[0045] Solid electrolyte 50 may include, for example, sulfide, oxide, and phosphate series. Each solid electrolyte material can be used or selectively used in various all-solid-state secondary batteries requiring specific electrochemical properties, atmospheric and moisture stability, negative reaction characteristics, and crystallinity. The sulfide series solid electrolytes include three types: binary sulfide, argyrodite, and thio-LISICON (lithium thiophosphate superion conductor). For the oxide and phosphate series, sodium superion conductor (NASICON) A may be included. x B2(PO4)3, Garnet, A3B3C2O 12 And perovskite structures. The selection criteria for the material can be the flexibility of the interface and the high-temperature processing temperature.

[0046] The cathode 60 may be arranged to enclose the outer surface of the solid electrolyte 50 and may be electrically connected to the solid electrolyte 50. The cathode 60 may contain lithium cobalt oxide (LiCoO2). The cathode 60 may have a thickness in the range of 10 nm to 10 μm, for example, in the range of 10 nm to 1 μm.

[0047] The current collector 70 can be arranged to cover the outer surface of the battery cell 30, and in this case, it can be arranged to cover the outer surface of the cathode 60 and can be electrically connected to the cathode 60. The current collector 70 may contain a conductor, such as at least one of gold (Au), silver (Ag), copper (Cu), aluminum (Al), tin (Sn), palladium (Pd), bismuth (Bi), indium (In), zinc (Zn), antimony (Sb), and their alloys. The current collector 70 may have a thickness in the range of 10 nm to 10 μm, for example, in the range of 10 nm to 1 μm. The current collector 70 is optional and can therefore be omitted.

[0048] The linear secondary battery 1 may further include an insulating covering layer 80, which is arranged to enclose the conductive wire body 20 and the cell 30. The insulating covering layer 80 may be arranged to enclose the current collector 70. The insulating covering layer 80 can perform the function of insulating the conductive wire body 20 and the cell 30 from the outside, and can also serve as a passivation function to protect the conductive wire body 20 and the cell 30. The insulating covering layer 80 may completely enclose the conductive wire body 20 and the cell 30. The insulating covering layer 80 may, for example, have a thickness in the range of 2 nm to 100 nm, for example, a thickness in the range of 2 nm to 50 nm. The insulating covering layer 80 may contain an insulating material, for example, it may contain an oxide, for example, it may contain at least one of aluminum oxide (Al2O3), titanium oxide (TiO2), zirconium oxide (ZrO2), and hafnium oxide (HfO2). In particular, when the insulating coating layer 80 is formed by at least one of aluminum oxide, titanium oxide, zirconium oxide and hafnium oxide, it has good insulation, excellent dielectric strength, does not require the formation of compounds between the material constituting the conductive wire body 20 and the metal, has high stability, excellent bonding during wire welding, and excellent protection.

[0049] The anode 40, solid electrolyte 50, cathode 60, current collector 70, and insulating coating 80 can be formed using physical vapor deposition (PVD), chemical vapor deposition (CVD), or atomic layer deposition (ALD).

[0050] The composition and thickness of the anode 40, solid electrolyte 50, cathode 60, current collector 70 and insulating coating layer 80 are exemplary, and the technical concept of the present invention is not limited thereto.

[0051] Furthermore, to prevent lithium ion diffusion, an anti-diffusion film may be further included between the conductive wire body 20 and the anode 40, and between the cathode 60 and the current collector 70. The anti-diffusion film comprises a metal nitride, such as titanium nitride (TiN), tantalum nitride (TaN), and combinations thereof. The anti-diffusion film may, for example, have a thickness in the range of 10 nm to 200 nm. For example, the anti-diffusion film may be composed of a composite layer of titanium nitride and tantalum nitride. The titanium nitride and tantalum nitride may, for example, each have a thickness in the range of 10 nm to 200 nm, or for example, each may have a thickness in the range of 50 nm.

[0052] Figure 2 In the linear secondary battery 1, the conductive wire body 20 can perform the function of an anode current collector, and the current collector layer 70a can perform the function of a cathode current collector.

[0053] Figure 3 This is a cross-sectional view of a linear secondary battery 10a according to an embodiment of the present invention.

[0054] Figure 3 The attached diagram on the left is along Figure 1 The cross-sectional view cut along the AA cutting line is shown in the attached diagram on the right. Figure 1 A cross-sectional view cut along the BB cutting line. (Compared to...) Figure 2 The components of the linear secondary battery 10 are repeated, and their descriptions will be omitted.

[0055] Reference Figure 3 Compared to Figure 2 The illustration shows a case where the positions of the anode and cathode are interchanged. The linear secondary battery 10a includes a conductive wire body 20a located inside the linear secondary battery 10a and one or more cells 30a arranged to cover at least a portion of the surface of the conductive wire body 20a.

[0056] The cell 30a may include an anode 40a, a solid electrolyte 50a, and a cathode 60a, thus enabling it to function as a secondary battery.

[0057] The cathode 60a can be arranged to wrap around the outer surface of the conductive wire body 20a and can be electrically connected to the conductive wire body 20a. The solid electrolyte 50a can be arranged to wrap around the outer surface of the cathode 60a and can be electrically connected to the cathode 60a. The solid electrolyte 50a can be sandwiched between the anode 40a and the cathode 60a. The anode 40a can be arranged to wrap around the outer surface of the solid electrolyte 50a and can be electrically connected to the solid electrolyte 50a. The current collector 70a can be arranged to wrap around the outer surface of the battery cell 30a, in which case it can be arranged to wrap around the outer surface of the anode 40a and can be electrically connected to the anode 40a.

[0058] Figure 3 In the linear secondary battery 1a, the conductive wire body 20a can perform the function of a cathode current collector, and the current collector layer 70a can perform the function of an anode current collector.

[0059] In addition, to prevent the diffusion of lithium ions, an anti-diffusion film may be further included between the conductive wire body 20a and the cathode 60a and between the anode 40a and the current collector 70a. The anti-diffusion film includes metal nitrides, such as titanium nitride (TiN) and tantalum nitride (TaN).

[0060] Figure 4 This is a schematic diagram of a battery pack 100 according to an embodiment of the present invention.

[0061] Reference Figure 4 The battery pack 100 may include a plurality of linear secondary batteries 10. Furthermore, the battery pack 100 may include a connecting portion 110 for electrically connecting the plurality of linear secondary batteries 10 and a sealing portion 120 for sealing the plurality of linear secondary batteries 10. Moreover, the sealing portion 120 may seal the connecting portion 110.

[0062] The connecting part 110 may include a conductor, such as at least one of gold (Au), silver (Ag), copper (Cu), aluminum (Al), tin (Sn), palladium (Pd), bismuth (Bi), indium (In), zinc (Zn), antimony (Sb) and their alloys.

[0063] The sealing portion 120 may include an insulator, for example, it may be made of various polymers.

[0064] Figure 5 These are detailed illustrations of embodiments of the present invention. Figure 4 Cross-sectional view of battery pack 100.

[0065] Reference Figure 5 The battery pack 100 includes a first linear secondary battery 10_1 and a second linear secondary battery 10_2.

[0066] The first linear secondary battery 10_1 includes a first conductive wire body 20_1 having a linear shape extending along an axial direction; one or more first cells 30_1 arranged to cover at least a portion of the surface of the first conductive wire body 20_1, and each including a first anode 40_1, a first solid electrolyte 50_1, and a first cathode 60_1; and a first insulating coating layer 80_1 arranged to cover the first conductive wire body 20_1 and the first cells 30_1. Furthermore, the first linear secondary battery 10_1 may further include a first current collector layer 70_1 arranged to cover the outer surface of the first cathode 60_1 and electrically connected to the first cathode 60_1.

[0067] The second linear secondary battery 10_2 may include a second conductive wire body 20_2 having a linear shape extending along an axial direction; one or more second cells 30_2 arranged to cover at least a portion of the surface of the second conductive wire body 20_2, and respectively including a second anode 40_2, a second solid electrolyte 50_2, and a second cathode 60_2; and a second insulating coating layer 80_2 arranged to cover the second conductive wire body 20_2 and the second cells 30_2. Furthermore, the second linear secondary battery 10_2 may further include a second current collector 70_2 arranged to cover the outer surface of the second cathode 60_2 and electrically connected to the second cathode 60_2.

[0068] Although Figure 5 The illustration shows two linear secondary batteries, but this is merely an example. The technical concept of this invention also applies to cases involving a greater number of linear secondary batteries.

[0069] The connecting part 110 can electrically connect the first linear secondary battery 10_1 and the second linear secondary battery 10_2. The connecting part 110 may include the first connecting part 110_1 and the second connecting part 110_2.

[0070] The first connecting part 110_1 can electrically connect the first conductive wire body 20_1 of the first linear secondary battery 10_1 to the second conductive wire body 20_2 of the second linear secondary battery 10_2.

[0071] Figure 5 The illustration shows the first connecting portion 110_1 exposed without being sealed by the sealing portion 120. However, this is only an example. The case where the sealing portion 120 covers and seals the first connecting portion 110_1 is also within the technical concept of the present invention.

[0072] The second connection portion 110_2 can electrically connect the first battery cell 30_1 and the second battery cell 30_2. The second connection portion 110_2 can also electrically connect the first current collector layer 70_1 of the first battery cell 30_1 and the second current collector layer 70_2 of the second battery cell 30_2. Alternatively, when the current collector layer 70 is omitted, the second connection portion 110_2 can electrically connect the first cathode 60_1 of the first battery cell 30_1 and the second cathode 60_2 of the second battery cell 30_2.

[0073] As described above, in order to electrically connect the second connection portion 110_2, a portion of each of the first insulating covering layer 80_1 and the second insulating covering layer 80_2 is removed, exposing a portion of each of the first battery cell 30_1 and the second battery cell 30_2, that is, exposing a portion of each of the first current collector layer 70_1 and the second current collector layer 70_2, so that they can be electrically connected to the second connection portion 110_2 respectively.

[0074] The first connecting portion 110_1 is disposed at both ends and is electrically connected to a plurality of first cells 30_1 of the first linear secondary battery 10_1, and is also electrically connected to a plurality of second cells 30_2 of the second linear secondary battery 10_2. Furthermore, the second connecting portion 110_2 can be disposed between the plurality of first cells 30_1 of the first linear secondary battery 10_1 and between the plurality of second cells 30_2 of the second linear secondary battery 10_2. The arrangement of the first connecting portion 110_1 and the second connecting portion 110_2 is merely exemplary, and the technical concept of the present invention is not limited thereto.

[0075] according to Figure 5 As shown in the electrical connection diagram, the first linear secondary battery 10_1 and the second linear secondary battery 10_2 in the battery pack 100 can be connected in parallel. Therefore, the battery pack 100 will have increased capacity at the same voltage.

[0076] The first connecting part 110_1 can be electrically connected to the first gasket 130, and the second connecting part 110_2 can be electrically connected to the second gasket 140. Thus, the battery pack 100 can be electrically connected to an external source and charged or discharged.

[0077] Figure 6This is a schematic diagram showing the series connection of linear secondary batteries in a battery pack 200 according to an embodiment of the present invention. Figure 5 The composition of the battery pack 100 is repetitive, so its description will be omitted.

[0078] Reference Figure 6 The battery pack 200 contains multiple linear secondary batteries arranged in series and connected in series.

[0079] The battery pack 200 may include a first conductive wire body (20-1), a second conductive wire body 20-2, a third conductive wire body 20-3, a fourth conductive wire body 20-4, a first battery cell 30_1, a second battery cell 30_2, a third battery cell 30_3, and a fourth battery cell 30_4. The connecting portion 110 may include a third connecting portion 110_3, a fourth connecting portion 110_4, a fifth connecting portion 110_5, and a sixth connecting portion 110_6.

[0080] The third connecting part 110_3 can be electrically connected to the first battery cell 30_1. The fourth connecting part 110_4 can be electrically connected to the first conductive wire body 20-1 and the second battery cell 30_2. The fourth connecting part 110_4 can be electrically connected to the first conductive wire body 20-1, and can further be electrically connected to the third battery cell 30_3. The fifth connecting part 110_5 can be electrically connected to the second conductive wire body 20-2 and the third battery cell 30_3. The sixth connecting part 110_6 can be electrically connected to the third conductive wire body 20-3 and the fourth battery cell 30_4. The fourth conductive wire body 20-4 can be electrically connected to an external source.

[0081] Assuming a single battery cell has a voltage of 3.7V, and two linear secondary cells are connected in series, the voltage can reach 7.4V. If three linear secondary cells are connected in series, the voltage can reach 11.1V. If four linear secondary cells are connected in series, the voltage can reach 14.8V. Furthermore, if even more linear secondary cells are connected in series, an even higher voltage can be achieved. Figure 7 This is a schematic diagram illustrating the stability of a battery pack according to an embodiment of the present invention.

[0082] Reference Figure 7 When one of the multiple linear secondary cells is damaged, the battery pack can still continue to operate while minimizing the risk of fire and explosion. This is achieved by encapsulating and separating the individual linear secondary cells using an insulating coating layer 80.

[0083] Figure 8 and Figure 9 These are schematic diagrams of battery packs 300 and 400 according to embodiments of the present invention.

[0084] Reference Figure 8The illustration shows a battery pack 300, in which multiple linear secondary batteries extend along an axial direction. The battery pack 300 can be used as a battery, and also functions as a structural support due to its sealed portion containing polymers or the like. The battery pack 300 can be applied, for example, to electronic devices with a long axis, such as the temples of smart glasses or the extension of wireless headphones.

[0085] Reference Figure 9 The illustration shows a battery pack 400, which consists of a large number of linear secondary cells arranged in a planar configuration. The battery pack 400 can be used, for example, as a pouch cell. Furthermore, by being assembled into a PCB resin layer, it can be used as a thin-film cell. For example, applying the battery pack 400 to a portion of multiple layers in a PCB can stably supply power to semiconductor chips, thereby improving power integrity.

[0086] Figures 10a to 10e This is a schematic diagram of a braided battery pack according to an embodiment of the present invention.

[0087] Reference Figures 10a to 10e The illustration shows various shapes of braided battery packs. The battery pack can be formed by unidirectionally weaving multiple linear secondary batteries to create a unidirectional woven fiber structure, such as... Figure 10a As shown. Alternatively, the battery pack may be formed by bidirectionally weaving the plurality of linear secondary batteries to create a bidirectional woven fiber structure. The bidirectional woven fiber structure may include... Figure 10b Plain weave Figure 10c Twill pattern Figure 10d Satin or Figure 10e At least one of the honeycomb types.

[0088] Figure 11 This is a schematic diagram illustrating the application fields of the battery pack according to an embodiment of the present invention.

[0089] Reference Figure 11 The illustration shows the application areas of the battery pack, such as wearable electronic devices. The battery pack based on the technical concept of this invention can be applied to various fields, such as headsets, glasses, headphones, hearing aids, smartwatches, rings, finger sensors, thigh assist devices, ankle assist devices, prosthetic arms, belts, prosthetic legs, clothing, bracelets, shoes, eyepieces, smart glasses, etc.

[0090] Furthermore, the battery pack based on the technical concept of this invention can be applied to various fields, such as smart cards, RFID, medical application devices, smart wearable devices, wireless sensor network systems, and portable electronic products.

[0091] The technical concept of the present invention described above is not limited to the embodiments and drawings presented above. Various substitutions, modifications and alterations can be made without departing from the scope of the technical concept of the present invention, which will be obvious to those skilled in the art to which the technical concept of the present invention pertains.

Claims

1. A wire-shaped secondary battery comprising: a conductive wire body having a wire shape extending in an axial direction; one or more cells arranged to wrap at least a part of a surface of the conductive wire body and including an anode, a solid-state electrolyte, and a cathode; and an insulating coating layer arranged to wrap the conductive wire body and the cell.

2. The wire-shaped secondary battery according to claim 1, wherein the anode is arranged to wrap an outer surface of the conductive wire body and is electrically connected to the conductive wire body, the solid-state electrolyte is arranged to wrap an outer surface of the anode, the cathode is arranged to wrap an outer surface of the solid-state electrolyte, further comprising a current collector layer arranged to wrap an outer surface of the cathode and electrically connected to the cathode.

3. The wire-shaped secondary battery according to claim 1, wherein the conductive wire body includes at least any one of gold (Au), silver (Ag), copper (Cu), aluminum (Al), tin (Sn), palladium (Pd), bismuth (Bi), indium (In), zinc (Zn), antimony (Sb), and alloys thereof, the anode includes lithium, the solid-state electrolyte includes lithium phosphorus oxynitride, the cathode includes lithium cobalt oxide.

4. The wire-shaped secondary battery according to claim 1, wherein the cathode is arranged to wrap an outer surface of the conductive wire body and is electrically connected to the conductive wire body, the solid-state electrolyte wraps an outer surface of the cathode, the anode is arranged to wrap an outer surface of the solid-state electrolyte, further comprising a current collector layer arranged to wrap an outer surface of the anode and electrically connected to the anode.

5. A battery pack comprising: a plurality of wire-shaped secondary batteries; a connection portion for electrically connecting the plurality of wire-shaped secondary batteries; and a sealing portion for sealing the plurality of wire-shaped secondary batteries. the plurality of wire-shaped secondary batteries includes:

6. The battery pack of claim 5, wherein, a first wire-shaped secondary battery including: a first conductive wire body having a wire shape extending in an axial direction; one or more first cells each arranged to wrap at least a part of a surface of the first conductive wire body and including a first anode, a first solid-state electrolyte, and a first cathode; and a first insulating coating layer arranged to wrap the first conductive wire body and the first cell; and a second wire-shaped secondary battery including: a second conductive wire body having a wire shape extending in an axial direction; one or more second cells each arranged to wrap at least a part of a surface of the second conductive wire body and including a second anode, a second solid-state electrolyte, and a second cathode; and a second insulating coating layer arranged to wrap the second conductive wire body and the cell. the connection portion includes:

7. The battery pack of claim 6, wherein, a first connection portion for electrically connecting the first conductive wire body and the second conductive wire body; and a second connection portion for electrically connecting the first cell and the second cell. a part of each of the first insulating coating layer and the second insulating coating layer is removed, and a part of each of the first cell and the second cell is exposed to be electrically connected to the second connection portion, respectively.

8. The battery pack of claim 7, wherein, the plurality of wire-shaped secondary batteries are connected in parallel.

9. The battery pack of claim 7, wherein, the connection portion includes:

10. The battery pack of claim 6, wherein, a third connection portion electrically connected to the first cell; a fourth connection portion for electrically connecting the first conductive wire body and the second cell; and a fifth connection portion electrically connected to the second conductive wire body. ​ 11. The battery pack of claim 10, wherein, The plurality of linear secondary cells are connected in series.

12. The battery pack of claim 5, wherein, The battery pack is formed by weaving the plurality of linear secondary cells in one direction to form a one-way woven fiber structure, or weaving the plurality of linear secondary cells in two directions to form a two-way woven fiber structure including at least any one of a plain weave type, a twill weave type, a satin weave type, or a honeycomb weave type.

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