Linear three-electrode secondary battery

Abstract

A linear three-electrode secondary battery according to some embodiments includes: a support body having a hollow tubular structure and including a plurality of holes on a surface; a reference electrode inserted into the support body; and an electrode assembly wound on the support body. Thus, some embodiments can stably perform three-electrode measurements even in the presence of physical movement.

Description

Technical Field

[0001] This disclosure relates to a linear three-electrode secondary battery.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0115029, filed on August 27, 2024, the entire contents of which are incorporated herein by reference. Background Technology

[0003] In an effort to reduce reliance on fossil fuels and consequently carbon emissions, there is a growing focus on rechargeable and reusable batteries. These batteries are used in a variety of fields, including vehicles, portable electronic devices, energy storage systems (ESS), and wearable and flexible devices.

[0004] Secondary batteries are typically classified by shape as cylindrical, prismatic, or pouch-shaped. However, secondary batteries with these shapes may not be suitable for wearable and flexible devices. Therefore, flexible linear secondary batteries can be used in wearable and flexible devices.

[0005] Simultaneously, to confirm the performance of the secondary battery, its electrode potential should be measured. Electrode potential measurement requires a three-electrode system comprising a reference electrode, a working electrode, and a counter electrode (or auxiliary electrode). The performance of linear secondary batteries can also be confirmed using a three-electrode system. In the case of linear secondary batteries, it is necessary to confirm performance under conditions of physical movement. Conventionally, three-electrode measurements are performed using a reference electrode placed outside the linear secondary battery; however, the problem with this method is that three-electrode measurements are performed unstablely when physical movement exists within the linear secondary battery.

[0006] Therefore, a technique is needed that can achieve stable three-electrode measurements even when there is physical movement in an online secondary battery. Summary of the Invention

[0007] [Technical Issues]

[0008] The technical problem to be solved by the present disclosure is to provide a linear three-electrode secondary cell that can stably perform three-electrode measurements even in the presence of physical movement.

[0009] [Technical Solution]

[0010] Some embodiments of this disclosure that can solve the above problems will be described below.

[0011] According to some embodiments, a linear three-electrode secondary cell includes:

[0012] A support having a hollow tubular structure and including multiple holes on its surface;

[0013] A reference electrode inserted inside the support; and

[0014] Electrode assembly wound around the support.

[0015] In some embodiments, the reference electrode may include a reference electrode active material layer located on one side, the reference electrode active material layer may be located inside the support, and the other side of the reference electrode opposite to one side of the reference electrode may be located outside the support.

[0016] In some embodiments, the reference electrode active material layer may include one or more of lithium metal and lithium titanium oxide.

[0017] In some embodiments, the electrode assembly may include a first electrode, a first diaphragm, and a second electrode.

[0018] The first electrode, the first diaphragm, and the second electrode can be stacked sequentially based on the support.

[0019] The polarities of the first electrode and the second electrode can be opposite to each other.

[0020] In some embodiments, the linear three-electrode secondary battery may include a second separator covering the electrode assembly.

[0021] In some embodiments, the second diaphragm may also cover the support.

[0022] In some embodiments, the linear three-electrode secondary battery may include packaging covering the second separator.

[0023] In some embodiments, the electrode assembly may be sheet-shaped.

[0024] In some embodiments, the electrode assembly may be spirally wound without overlapping.

[0025] In some embodiments, the electrode assembly may be spirally wound to overlap within a range of 0.1 to 0.5 times the width of the electrode assembly.

[0026] [Beneficial Effects]

[0027] Some embodiments of this disclosure can stably perform three-electrode measurements even in the presence of physical movement.

[0028] The effects of the embodiments of this disclosure are not limited to those described above, and those skilled in the art can clearly derive and understand other effects not mentioned from the following description. In other words, unintended effects of the embodiments of this disclosure can also be derived and understood by those skilled in the art to which the embodiments of this disclosure pertain. Attached Figure Description

[0029] Figure 1 A linear three-electrode secondary cell according to some embodiments is schematically shown.

[0030] Figure 2 It is along Figure 1 The cross-sectional view taken from line I-I'.

[0031] Figure 3 An electrode assembly comprising an in-line three-electrode secondary battery is schematically shown according to some embodiments.

[0032] Figure 4 A support structure included in an inline three-electrode secondary cell according to some embodiments is schematically shown.

[0033] Figure 5 A reference electrode is schematically shown in an in-line three-electrode secondary cell according to some embodiments.

[0034] Figure 6 Electrode assemblies wound on a support are shown schematically in some embodiments.

[0035] Figure 7 An electrode assembly wound on a support is shown schematically in another embodiment.

[0036] Figure 8 The diagram schematically illustrates a portion of an electrode assembly wound and overlapping on a support in another embodiment.

[0037] Figure 9 A second diaphragm covering the electrode assembly is schematically shown in some embodiments.

[0038] Figure 10 A second diaphragm covering the electrode assembly is schematically shown in another embodiment. Detailed Implementation

[0039] The terms and words used in this specification should not be construed as limited to their conventional or dictionary meanings, but should be interpreted based on the meaning and concept of the technical concept according to this disclosure, based on the inventor's appropriate definition of the meaning of the terms or words in order to best explain the principles of the invention.

[0040] In this specification, terms such as "comprising," "including," or "having" should be understood to specify the presence of the features, quantities, steps, operations, components, or combinations thereof described in the specification, and should be understood not to exclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, or combinations thereof. Furthermore, when a portion of a layer, membrane, region, plate, etc., is disposed "on" another portion, this includes not only the case where one portion is "directly" disposed "on" another portion, but also the case where other portions are inserted between them. Conversely, when a portion of a layer, membrane, region, plate, etc., is disposed "below" another portion, this includes not only the case where one portion is "directly" disposed "below" another portion, but also the case where other portions are inserted between them.

[0041] It should be understood that the embodiments and drawings are merely examples of this disclosure and do not represent all the technical spirit of this disclosure, and various equivalents and modifications that can replace them may exist.

[0042] In describing this disclosure, a detailed description of a known configuration or function is omitted where it is determined that such a description may obscure the essential points of this disclosure.

[0043] Since the accompanying drawings are provided to provide a more complete explanation of this disclosure to those skilled in the art, the shapes, dimensions, and quantities of the components in the drawings may be shown enlarged, omitted, or schematically for clarity. The shape, size, scale, and quantity of each component in the drawings do not fully reflect the actual shape, size, scale, and quantity of each component.

[0044] [First Implementation Method]

[0045] Figure 1 A linear three-electrode secondary cell according to some embodiments is schematically shown.

[0046] Figure 2 It is along Figure 1 The cross-sectional view taken from line I-I'.

[0047] Figure 3 An electrode assembly comprising an in-line three-electrode secondary battery is schematically shown according to some embodiments.

[0048] Figure 4 A support structure included in an inline three-electrode secondary cell according to some embodiments is schematically shown.

[0049] Figure 5 A reference electrode is schematically shown in an in-line three-electrode secondary cell according to some embodiments.

[0050] Figure 6 Electrode assemblies wound on a support are shown schematically in some embodiments.

[0051] Figure 9 A second diaphragm covering the electrode assembly is schematically shown in some embodiments.

[0052] Reference Figures 1 to 6 and Figure 9 According to some embodiments, a linear three-electrode secondary battery 1000 may include a support 1200, a reference electrode 1100, an electrode assembly 1300, a second separator 1400, and a package 1500.

[0053] refer to Figure 4 In some embodiments, the support 1200 has a hollow tubular structure and may include a plurality of holes 1200H2 on its surface. The support 1200 may include an internal space 1200H1 into which the reference electrode 1100 may be inserted.

[0054] Since the support 1200 provides the internal space 1200H1, the reference electrode 1100 can be included as a single unit in the linear three-electrode secondary cell 1000 together with the electrode assembly 1300. Therefore, the linear three-electrode secondary cell 1000 can stably perform three-electrode measurements even when there is physical movement. Thus, when the linear three-electrode secondary cell 1000 is applied to wearable devices and flexible devices, it can be advantageous for predicting and analyzing the electrochemical behavior of the positive and negative electrodes.

[0055] Since the support 1200 includes multiple holes 1200H2 on its surface, the electrolyte injected into the internal space 1200H1 of the support 1200 during the manufacturing stage of the linear three-electrode secondary battery 1000 can freely enter and exit through the multiple holes 1200H2.

[0056] The support 1200 can serve as the basis for the linear shape of the linear three-electrode secondary battery 1000. Even when physical movement occurs within the linear three-electrode secondary battery 1000, the support 1200 can prevent deformation, collapse, or damage to the linear three-electrode secondary battery 1000. The support 1200 can provide flexibility and / or flexibility to the linear three-electrode secondary battery 1000. The higher the flexibility and / or flexibility of the support 1200, the more preferred it is. The support 1200 can be non-conductive.

[0057] In some embodiments, the material of the support 1200 may be one or more of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, polyimide, polyethylene terephthalate, polyamide-imide, polyesterimide, polyethersulfone, and polysulfone.

[0058] refer to Figure 2 In some embodiments, the reference electrode 1100 may be inserted inside the support 1200. (See reference...) Figure 5 In some embodiments, the reference electrode 1100 may include a reference electrode active material layer 1110 and a metal wire 1120.

[0059] The reference electrode active material layer 1110 may surround one side of the metal line 1120. In some embodiments, the reference electrode active material layer 1110 may include one or more of lithium metal and lithium titanium oxide.

[0060] although Figure 5 The diagram shows one metal wire 1120, but this is merely illustrative; the number of metal wires 1120 can also be multiple. As a non-limiting example, the number of metal wires 1120 can be two, and the two metal wires 1120 can be twisted together. The material of the metal wires 1120 can be a metal with excellent electrical conductivity. As a non-limiting example, the material of the metal wires 1120 can be copper or copper coated with nickel.

[0061] refer to Figure 1 , Figure 6 and Figure 9 In some embodiments, a portion of the reference electrode 1100 may be located inside the support 1200, while the remainder may be located outside the support 1200. In some embodiments, an insulating layer may surround the portion of the reference electrode 1100 located inside the support 1200. The reference electrode active material layer 1110 may be located inside the support 1200. A portion of the metal wire 1120 may be located inside the support 1200, while the remainder may be located outside the support 1200. The portion of the metal wire 1120 located outside the support 1200 may serve as a reference electrode tab, through which an electrical connection to the reference electrode 1200 is achieved during three-electrode measurements.

[0062] refer to Figure 2 In some embodiments, the electrode assembly 1300 may be wound around the support 1200. In some embodiments, the electrode assembly 1300 may be sheet-like. (See reference...) Figure 2 and Figure 3, in some embodiments, the electrode assembly 1300 may include a first electrode 1310, a first separator 1330, and a second electrode 1320. The first electrode 1310, the first separator 1330, and the second electrode 1320 may be sequentially stacked based on the support 1200. The electrode polarities of the first electrode 1310 and the second electrode 1320 may be opposite to each other.

[0063] The first electrode 1310 may include a first electrode current collector 1310CC. The first electrode current collector 1310CC may be located on the support 1200. The first electrode current collector 1310CC may include a material that has electrical conductivity and does not cause chemical changes to the finally manufactured electrode. As a non-limiting example, the first electrode current collector 1310CC may include aluminum, copper, stainless steel, nickel, titanium, or calcined carbon. As a non-limiting example, the first electrode current collector 1310CC may include aluminum, copper, and stainless steel surface-treated with carbon, nickel, titanium, silver, etc. A fine uneven structure for increasing the adhesion to the first electrode active material layer 1310AML may be formed on the surface of the first electrode current collector 1310CC. The first electrode current collector 1310CC may be sheet-shaped. The thickness of the first electrode current collector 1310CC may be in the range of about 3 μm to about 500 μm.

[0064] The first electrode 1310 may include a first electrode active material layer 1310AML. The first electrode 1310 may be a positive electrode or a negative electrode. The first electrode active material layer 1310AML may be located on the first electrode current collector 1310CC. The first electrode active material layer 1310AML may include an electrode active material, a binder, and a conductive material. The first electrode active material layer 1310AML may be sheet-shaped.

[0065] If the first electrode 1310 is a positive electrode, the first electrode active material layer 1310AML may include a positive electrode active material. As a non-limiting example, the positive electrode active material may include one or more of the following: lithium-iron-based oxides (e.g., LiFePO4, etc.), lithium-manganese-based oxides (e.g., LiMnO2, LiMn2O4, etc.), lithium-cobalt-based oxides (e.g., LiCoO2, etc.), lithium-nickel-based oxides (e.g., LiNiO2, etc.), lithium-nickel-manganese-based oxides (e.g., LiNi 1-y1 Mn y1 O2 (where 0 < y1 < 1) and LiMn 2-z1 Ni z1 O4 (where 0 < z1 < 2), etc.), lithium-nickel-cobalt-based oxides (e.g., LiNi 1-y2 Co y2 O2 (where 0 < y2 < 2), etc.), lithium-manganese-cobalt-based oxides (e.g., LiCo 1-y3 Mny3 O2 (where 0 < y3 < 1) and LiMn 2-z2 Co z2 O4 (where 0 < z2 < 2), etc., lithium-nickel-manganese-cobalt-based oxides (e.g., Li(Ni P1 Co q1 Mn r1 )O2 (where 0 < pl < 1, 0 < ql < 1, 0 < rl < 1, p1 + q1 + r1 = 1), Li(Ni p2 Co q2 Mn r2 )O4 (where 0 < p2 < 2, 0 < q2 < 2, 0 < r2 < 2, p2 + q2 + r2 = 2), etc., lithium-nickel-cobalt-manganese-metal (M) oxides (e.g., Li(Ni P3 Co q3 Mn r3 M s1 )O2 (where M is selected from Al, Cu, Fe, V, Cr, Ti, Zr, Zn, Ta, Nb, Mg, B, W, and Mo, 0 < p3 < 1, 0 < q3 < 1, 0 < r3 < 1, 0 < s1 < 1, p3 + q3 + r3 + s1 = 1), etc.).

[0066] If the first electrode 1310 is a negative electrode, the first electrode active material layer 1310AML may include a negative electrode active material. As a non-limiting example, the negative electrode active material may include one or more of the following: lithium metal; graphite-based carbon materials, such as amorphous, plate-like, flaky, spherical, or fibrous natural graphite or artificial graphite; amorphous carbon materials, such as soft carbon and hard carbon; metals, such as Cu, Ni, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn, or alloys of metals and lithium; PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5, Li x Fe2O3 (0 ≤ x ≤ 1), Li x WO2 (0 ≤ x ≤ 1), Sn x Me 1-x Me' y O z (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogens; 0 < x ≤ 1; 1 ≤ y ≤ 3; 1 ≤ z ≤ 8); Si, SiO x(0 < x ≤ 2), Si-Y alloy (where Y is an element selected from alkali metals, alkaline earth metals, Group 13 elements, Group 14 elements, transition metals, rare earth elements, and combinations thereof, and is not Si), Sn, SnO2, Sn-Y (where Y is an element selected from alkali metals, alkaline earth metals, Group 13 elements, Group 14 elements, transition elements, rare earth elements, and combinations thereof, and is not Sn).

[0067] As non-limiting examples, the binder may include one or more of the following: polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose, starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer, sulfonated ethylene-propylene-diene terpolymer, styrene-butadiene rubber, and styrene-butadiene rubber-carboxymethyl cellulose fluororubber.

[0068] As non-limiting examples, the conductive material may include one or more of the following: carbon nanotubes; graphite; carbon-based materials such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers and metal fibers; metal powders such as carbon fluoride, aluminum, and nickel powders; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; and polyphenylene.

[0069] The first separator 1330 may be located between the first electrode active material layer 1310 AML and the second electrode active material layer 1320 AML. The first separator 1330 may be in sheet form. As non-limiting examples, the first separator 13,30 may be: a porous polymer substrate made of a polyolefin-based polymer selected from ethylene homopolymers, propylene homopolymers, ethylene-butene copolymers, ethylene-hexene copolymers, and ethylene-methyl acrylate copolymers; a porous polymer substrate made of a polymer selected from polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyether ether ketones, polyether sulfones, polyphenylene ethers, polyphenylene sulfides, and polyethylene naphthalate; a porous polymer substrate having a porous coating formed from a mixture of inorganic particles and a binder polymer on at least one surface of the porous polymer substrate; or a porous substrate formed from a mixture of inorganic particles and a binder polymer.

[0070] The second electrode 1320 may include a second electrode active material layer 1320AML. The second electrode 1320 may be a positive or negative electrode. If the first electrode 1310 is a positive electrode, then the second electrode 1320 may be a negative electrode; conversely, if the first electrode 1310 is a negative electrode, then the second electrode 1320 may be a positive electrode. The second electrode active material layer 1320AML may be located on the first separator 1330. The second electrode active material layer 1320AML may include an electrode active material, a binder, and a conductive material. The electrode active material, binder, and conductive material included in the second electrode active material layer 1320AML may be the same as those described above with respect to the first electrode active material layer 1310AML. The second electrode active material layer 1320AML may be sheet-like.

[0071] The second electrode 1320 may include a second electrode current collector 1320CC. The second electrode current collector 1320CC may be located on the second electrode active material layer 1320AML. The materials included in the second electrode current collector 1320CC and the structure of the second electrode current collector 1320CC may be the same as those described above for the first electrode current collector 1310CC.

[0072] Reference Figure 1 , Figure 6 and Figure 9 The first electrode contact 1310T and the second electrode contact 1320T can protrude from both ends of the linear three-electrode secondary cell 1000. One of the first electrode contact 1310T and the second electrode contact 1320T can be located on the same side as the reference electrode contact. However, alternatively, the first electrode contact 1310T and the second electrode contact 1320T can protrude from one end of the linear three-electrode secondary cell 1000. Furthermore, both the first electrode contact 1310T and the second electrode contact 1320T can be located on the same side as the reference electrode contact.

[0073] The first electrode contact 1310T can be connected to the first electrode current collector 1310CC via welding or the like. The second electrode contact 1320T can be connected to the second electrode current collector 1320CC via welding or the like. During three-electrode measurement, electrical connection to the first electrode 1310 can be achieved via the first electrode contact 1310T. During three-electrode measurement, electrical connection to the second electrode 1320 can be achieved via the second electrode contact 1320T.

[0074] refer to Figure 6The electrode assembly 1300 can be helically wound onto the support 1200 without overlapping. Typically, the electrode assembly 1300 can have lower flexibility and / or flexurality than the support 1200. Therefore, by helically winding the electrode assembly 1300 onto the support 1200 without overlapping, the flexibility and / or flexurality of the linear three-electrode secondary battery 1000 can be increased. The spacing between the helically wound non-overlapping electrode assemblies 1300 can be in the range of twice the width W of the electrode assembly 1300. When the spacing is too large, the performance of the linear three-electrode secondary battery 1000, such as its capacity, may deteriorate.

[0075] refer to Figure 9 In some embodiments, the second diaphragm 1400 may cover the electrode assembly 1300. The second diaphragm 1400 may not cover the support 1200. In this specification, "A covers B" means that A is in direct contact with B and blocks B so that B is not visible from the outside. The second diaphragm 1400 may be spirally wound around the support 1200 along the electrode assembly 1300 without overlapping.

[0076] As a non-limiting example, in the manufacturing process of the linear three-electrode secondary battery 1000, after the electrode assembly 1300 is wound onto the support 1200, the second separator 1400 can be wound along the electrode assembly 1300 onto the support 1200.

[0077] As a non-limiting example, the second separator 1400 may be part of the electrode assembly 1300. That is, the electrode assembly 1300 may be a laminate in which the first electrode 1310, the first separator 1330, the second electrode 1320, and the second separator 1400 are sequentially stacked. In this case, during the manufacturing process of the linear three-electrode secondary battery 1000, when the electrode assembly 1300 is wound onto the support 1200, the second separator 1400 may be wound onto the support 1200. The second separator 1400 may be located on the second electrode current collector 1320CC.

[0078] The material and structure of the second diaphragm 1400 are the same as those described above for the first diaphragm 1330.

[0079] refer to Figure 1 and Figure 2 Packaging 1500 can cover the second diaphragm 1400. Packaging 1500 can protect all components except the first electrode contact 1310T, the second electrode contact 1320T and the reference electrode contact from the external environment.

[0080] In some embodiments, packaging 1500 may include a bag made of polymeric material. As a non-limiting example, the bag made of polymeric material may include one or more of PET, PVC, HDPE, and epoxy resin.

[0081] In some embodiments, packaging 1500 may additionally include a moisture-proof layer, an insulating layer, a heat-sealing layer, etc. As a non-limiting example, the moisture-proof layer may include a metal such as aluminum. As a non-limiting example, the insulating layer may include polyester or polyamide. As a non-limiting example, the heat-sealing layer may include polypropylene, polycarbonate, polyethylene, etc.

[0082] [Second Implementation]

[0083] Regarding the second embodiment, only the differences from the first embodiment will be described.

[0084] Figure 7 An electrode assembly wound on a support is shown schematically in another embodiment.

[0085] Figure 8 The diagram schematically illustrates a portion of an electrode assembly wound and overlapping on a support in another embodiment.

[0086] refer to Figure 7 and Figure 8 The electrode assembly 1300 can be spirally wound around the support 1200 to overlap. However, as mentioned above, since the electrode assembly 1300 can typically have lower flexibility and / or flexurality than the support 1200, the flexibility and / or flexurality of the linear three-electrode secondary battery 1000 may be significantly reduced if the electrode assemblies 1300 overlap too much. In some embodiments, the electrode assemblies 1300 can overlap in the range of 0.1 to 0.5 times the width W of the electrode assembly 1300. (See reference...) Figure 8 The length of the overlap width OL can be in the range of 0.1 to 0.5 times the width W of the electrode assembly 1300.

[0087] The second embodiment may have lower flexibility and / or flexurality than the first embodiment, but may have higher performance, such as capacity, than the first embodiment.

[0088] [Third Implementation Method]

[0089] Regarding the third embodiment, only the differences from the first embodiment will be described.

[0090] Figure 10 A second diaphragm covering the electrode assembly is schematically shown in another embodiment.

[0091] Reference Figure 10In some embodiments, the second diaphragm 1400 may cover not only the electrode assembly 1300, but also the support 1200.

[0092] The third implementation may have better security than the first implementation.

[0093] The foregoing description is merely illustrative of this disclosure. The scope of this disclosure should be interpreted according to the claims, and all technical concepts within or equivalent to these claims should be construed as being included within the scope of this disclosure.

[0094] [Explanation of reference numerals in the attached figures]

[0095] 1000: Linear three-electrode secondary cell

[0096] 1100: Reference electrode

[0097] 1110: Reference electrode active material layer

[0098] 1120: Metal wire

[0099] 1200: Support

[0100] 1200H1: Interior space

[0101] 1200H2: Hole

[0102] 1300: Electrode assembly

[0103] 1310: First electrode

[0104] 1310CC: First Electrode Current Collector

[0105] 1310AML: First electrode active material layer

[0106] 1320: Second electrode

[0107] 1320CC: Second Electrode Current Collector

[0108] 1320AML: Second electrode active material layer

[0109] 1330: First diaphragm

[0110] 1400: Second diaphragm

[0111] 1500: Packaging

Claims

1. A linear three-electrode secondary battery, comprising: A support having a hollow tubular structure and including multiple holes on its surface; A reference electrode inserted inside the support body; and Electrode assembly wound around the support.

2. The linear three-electrode secondary battery according to claim 1, wherein, The reference electrode includes a reference electrode active material layer located on one side. The reference electrode active material layer is located inside the support. The other side of the reference electrode, opposite to one side of the reference electrode, is located outside the support.

3. The linear three-electrode secondary battery according to claim 2, wherein, The reference electrode active material layer includes one or more of lithium metal and lithium titanium oxide.

4. The linear three-electrode secondary battery according to claim 1, wherein, The electrode assembly includes a first electrode, a first diaphragm, and a second electrode. The first electrode, the first diaphragm, and the second electrode are stacked sequentially based on the support. The first electrode and the second electrode have opposite polarities.

5. The linear three-electrode secondary battery according to claim 1, further comprising a second separator covering the electrode assembly.

6. The linear three-electrode secondary battery according to claim 5, wherein, The second diaphragm also covers the support.

7. The linear three-electrode secondary battery according to claim 5, further comprising packaging covering the second separator.

8. The linear three-electrode secondary battery according to claim 1, wherein, The electrode assembly is plate-shaped.

9. The linear three-electrode secondary battery according to claim 8, wherein, The electrode assembly is spirally wound without overlapping.

10. The linear three-electrode secondary battery according to claim 8, wherein, The electrode assembly is spirally wound to overlap within a range of 0.1 to 0.5 times the width of the electrode assembly.

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