Electrode assembly and secondary battery comprising same

Abstract

Provided is an electrode assembly according to exemplary embodiments of the present invention. The electrode assembly comprises positive and negative electrodes, a separator therebetween, and an insulation member, wherein the insulation member comprises one or more holes overlapping with positive and negative electrode. The electrode assembly allows ions to move through the one or more holes and may be a jelly roll-type that is wound around a first direction as the axis.

Description

Electrode assembly and secondary battery including the same

[0001] It relates to an electrode assembly and a secondary battery including the same.

[0002] This application claims the benefit of Korean Application No. 10-2024-0119915, filed September 4, 2024, which is incorporated herein by reference in its entirety.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] Secondary batteries are manufactured through electrode processes, assembly processes, and activation processes. In the electrode process, an electrode assembly including a positive electrode, a negative electrode, and a separator may be provided. In the assembly process, the electrode assembly and electrolyte may be housed in a case. In the activation process, the assembled battery cell may undergo charging, discharging, and aging processes. The activation process activates and stabilizes the battery cell with electrical energy.

[0005] The technical idea of ​​the present invention is to provide an electrode assembly with improved safety.

[0006] The technical idea of ​​the present invention aims to solve a problem by providing an electrode assembly with improved performance and reliability.

[0007] The technical idea of ​​the present invention is to provide a secondary battery including an electrode assembly with improved safety.

[0008] The technical idea of ​​the present invention aims to solve a problem by providing a secondary battery including an electrode assembly with improved performance and reliability.

[0009] According to exemplary embodiments of the present invention for solving the above-described problem, an electrode assembly may be provided. The electrode assembly includes an anode, a cathode, and a separator and an insulating material therebetween, wherein the insulating material includes one or more holes overlapping the anode and the cathode, and is configured to allow ions to move through the one or more holes, and may be of a jelly roll type wound around a first direction as an axis.

[0010] The cathode, the separator, the insulation, and the anode may be arranged in sequence.

[0011] The cathode, the insulating material, the separator, and the anode may be arranged in sequence.

[0012] A first layer and a second layer integrally connected to the first layer and including a portion surrounded by the first layer, wherein the first layer has the cathode, the separator, and the anode arranged in sequence, and the second layer has the cathode, the separator, and the anode arranged in sequence, and the insulating material may be disposed between the anode of the first layer and the cathode of the second layer.

[0013] The above insulation may include one or more materials selected from aerogel, silicate, silicon, and polyurethane (PU).

[0014] The one or more holes may include one or more shapes selected from a circle, a square, and a triangle.

[0015] The sum of the areas of the one or more holes in the above insulating material may be 30% to 50% of the area of ​​the anode.

[0016] According to exemplary embodiments of the present invention for solving the above-described problem, a secondary battery may be provided. The secondary battery includes: a case; an electrode assembly accommodated in the case, the electrode assembly including a positive electrode, a negative electrode, and a separator therebetween and a first insulating material; and an electrolyte, wherein the first insulating material includes at least one first hole overlapping the electrode and is configured such that ions can move through the at least one first hole, and the electrode assembly may be a jelly roll type wound about a first direction as an axis.

[0017] The cathode, the separator, the anode, and the first insulating material may be arranged in sequence along one direction from the inner wall of the case toward the core of the electrode assembly.

[0018] The device further includes a second insulating material disposed between at least one of the cathode and the separator and between the separator and the anode, wherein the second insulating material may include one or more second holes overlapping the anode and the cathode.

[0019] The above case may be a can.

[0020] According to exemplary embodiments of the present invention, the electrode assembly may include an insulating material disposed between the anode and the cathode to delay heat transfer.

[0021] According to exemplary embodiments of the present invention, the insulating material included in the electrode assembly may include one or more holes through which ions can move, thereby improving ion permeability.

[0022] According to exemplary embodiments of the present invention, an electrode assembly with improved safety can be provided.

[0023] According to exemplary embodiments of the present invention, an electrode assembly with improved performance and reliability can be provided.

[0024] According to exemplary embodiments of the present invention, a secondary battery including an electrode assembly with improved safety can be provided.

[0025] According to exemplary embodiments of the present invention, a secondary battery including an electrode assembly having improved performance and reliability can be provided.

[0026] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing 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.

[0027] FIG. 1 is a perspective view schematically illustrating a secondary battery according to embodiments of the technical idea of ​​the present invention.

[0028] Figure 2 is an exploded perspective view of a secondary battery according to embodiments of the technical idea of ​​the present invention.

[0029] FIG. 3 is a cross-sectional view of an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0030] FIG. 4 is an enlarged cross-sectional view illustrating an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0031] FIG. 5 is an exploded perspective view illustrating an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0032] FIG. 6 is a plan view of an insulating material of an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0033] FIG. 7 is a plan view of an insulating material of an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0034] FIG. 8 is a plan view of an insulating material of an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0035] FIG. 9 is an enlarged cross-sectional view illustrating an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0036] FIG. 10 is an enlarged cross-sectional view illustrating an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0037] FIG. 11 is an enlarged cross-sectional view illustrating an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0038] FIG. 12 is a cross-sectional view of an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0039] FIG. 13 is an enlarged cross-sectional view illustrating an electrode assembly according to embodiments of the technical idea of ​​the present invention.

[0040] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0041] Accordingly, 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. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0042] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0043] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0044]

[0045] (Example 1)

[0046] FIG. 1 is a perspective view schematically illustrating a secondary battery (100) according to embodiments of the technical idea of ​​the present invention.

[0047] Figure 2 is an exploded perspective view of a secondary battery (100) according to embodiments of the technical idea of ​​the present invention.

[0048] Referring to FIGS. 1 and 2, the secondary battery (100) may include an electrode assembly (120EA), a case (100C), and a cap assembly (130CA).

[0049] The electrode assembly (120EA) can be inserted into the case (100C). The case (100C) can accommodate the electrode assembly (120EA) by combining with the cap assembly (130CA). The case (100C) may be a can.

[0050] The cap assembly (130CA) may include a first plate (131), a second plate (132), and a third plate (133) that are sequentially stacked. The cap assembly (130CA) may include a positive terminal (130P) and a negative terminal (130N) on the first plate (131). Venting holes (136) may be further formed in the first plate (131), the second plate (132), and the third plate (133).

[0051] The secondary battery (100) may further include an electrolyte injected into the case (100C).

[0052]

[0053] FIG. 3 is a cross-sectional view of an electrode assembly (120EA) according to embodiments of the technical idea of ​​the present invention. Specifically, FIG. 3 is a cross-sectional view of an electrode assembly (120EA) along line AA of FIG. 2.

[0054] Fig. 4 is an enlarged cross-sectional view illustrating an electrode assembly (120EA) according to embodiments of the technical idea of ​​the present invention. Specifically, Fig. 4 is an enlarged cross-sectional view of the EX1 area of ​​Fig. 3.

[0055] Fig. 5 is an exploded perspective view illustrating an electrode assembly (120EA) according to embodiments of the technical idea of ​​the present invention. Specifically, Fig. 5 illustrates only some components of the EX1 area of ​​Fig. 3 in order to explain the electrode assembly (120EA) of Fig. 3.

[0056] FIG. 6 is a plan view of an insulating material (122) of an electrode assembly (120EA) according to embodiments of the technical idea of ​​the present invention.

[0057] Referring to FIGS. 3 to 5, the electrode assembly (120EA) may include a positive electrode (120P), a separator (121), an insulator (122), and a negative electrode (120N). In the present specification, the electrode assembly (120EA) may be a jelly roll type. Specifically, the electrode assembly (120EA) may be a jelly roll type in which the positive electrode (120P), the separator (121), and the negative electrode (120N) are sequentially wound along one axis. For example, the negative electrode (120N) may be wound along one axis, the separator (121) may be wound on the negative electrode (120N) along the one axis, and the positive electrode (120P) may be wound on the separator (121) along the one axis. At this time, the electrode assembly (120EA) may be in a form in which an insulating material (122) is wound around the anode (120P) and cathode (120N) with the anode (120P) and cathode (120N) as an axis. For example, the electrode assembly (120EA) may be a jelly roll type in which the anode (120P), the separator (121), and the cathode (120N) are sequentially wound around the third direction (D3).

[0058] Specifically, a plurality of positive electrodes (120P) and a plurality of negative electrodes (120N) may be alternately arranged, and a separator (121) and / or an insulator (122) may be arranged between each of the plurality of positive electrodes (120P) and the plurality of negative electrodes (120N).

[0059] In Fig. 3, it is exemplified that in a jelly roll type electrode assembly (120EA), a cathode (120N) is placed at the outermost side, and a separator (121) and an anode (120P) are placed inside the cathode (120N). A separator (121) may be placed again inside the anode (120P), and an insulating material (122) and a cathode (120N) may be placed.

[0060] In this specification, "a component being arranged on the periphery" may mean surrounding other components. In particular, the component may surround other components in the first direction (D1) and the second direction (D2). For example, the component may surround other components along the third direction (D3).

[0061] In this specification, being placed inside a component may mean being surrounded by that component. In particular, it may be surrounded by that component in a first direction (D1) and a second direction (D2). For example, it may be surrounded by another component with a third direction (D3) as an axis.

[0062] In other words, in the jelly roll type electrode assembly (120EA) illustrated in FIG. 3, the cathode (120N) can surround other components in the first direction (D1) and the second direction (D2). In particular, the cathode (120N) can surround the separator (121) in the first direction (D1) and the second direction (D2), and the separator (121) can then surround the anode (120P) in the first direction (D1) and the second direction (D2).

[0063] As illustrated in FIG. 4, within the EX1 region including the first direction (D1) and the second direction (D2), the positive electrode (120P), the separator (121), the insulator (122), and the negative electrode (120N) can be laminated in the first direction (D1). Within the EX1 region, the positive electrode (120P), the separator (121), the insulator (122), and the negative electrode (120N) can overlap in the first direction (D1).

[0064] In embodiments, the electrode assembly (120EA) may include a first layer (S1) and a second layer (S2), each including a positive electrode (120P), a separator (121), and a negative electrode (120N). The second layer (S2) may be connected to the first layer (S1) to integrally form an outer portion of the electrode assembly (120EA). The second layer (S2) may be surrounded by the first layer (S1). The second layer (S2) may include a portion surrounded by the first layer (S1).

[0065] For example, a first layer (S1) may be placed on the inner wall of a case (120C, see FIG. 2), and a second layer (S2) may be placed on the first layer (S1). The second layer (S2) may be spaced apart from the case (120C) with the first layer (S1) interposed therebetween.

[0066] In the first layer (S1), the cathode (120N), the separator (121), and the anode (120P) may be arranged sequentially. In the first layer (S1), the cathode (120N) may be arranged on the outside, and the separator (121) and the anode (120P) may be arranged sequentially on the inside of the cathode (120N). For example, the first layer (S1) may not include an insulating material (122).

[0067] In the second layer (S2), the cathode (120N), the separator (121), and the anode (120P) may be arranged in sequence. In the second layer (S2), the cathode (120N) may be arranged on the outside, and the separator (121) and the anode (120P) may be arranged in sequence on the inside of the cathode (120N).

[0068] A separator (121) and an insulator (122) may be disposed between the anode (120P) of the first layer (S1) and the cathode (120N) of the second layer (S2). Specifically, the separator (121) and the insulator (122) may be disposed sequentially between the anode (120P) of the first layer (S1) and the cathode (120N) of the second layer (S2).

[0069] For example, a separator (121) may be placed inside the anode (120P) of the first layer (S1), an insulator (122) may be placed inside the separator (121), and a cathode (120N) of the second layer (S2) may be placed inside the insulator (122). For example, a separator (121) may be placed inside the first layer (S1), an insulator (122) may be placed inside the separator (121), and a second layer (S2) may be placed inside the insulator (122).

[0070] For example, the cathode (120N), the separator (121), and the anode (120P) of the first layer (S1) may be arranged in sequence along one direction from the inner wall of the case (120C) toward the core of the electrode assembly (120EA), the separator (121) and the insulator (122) may be arranged, and the cathode (120N), the separator (121), and the anode (120P) of the second layer (S2) may be arranged in sequence.

[0071] In this specification, the core may mean the innermost part of the electrode assembly (120EA), which is surrounded by a cathode (120N), a separator (121), an insulator (122), and an anode (120P).

[0072] The first layer (S1) may constitute the outermost portion of the electrode assembly (120EA). In particular, the cathode (120N) of the first layer (S1) may be positioned at the outermost portion of the electrode assembly (120EA). In embodiments, the electrode assembly (120EA) may include an insulating material (122), and the cathode (120N), a separator (121), and an anode (120P) may be positioned at the outermost portion, and the insulating material (122) may be positioned inside thereof.

[0073] In the embodiments, the arrangement of the insulation (122) that can be arranged between the anode (120P) and the cathode (120N) is not limited to the example, and can be arranged by changing the design as needed.

[0074] In embodiments, the insulation (122) may include a material having insulating properties. For example, the insulation (122) may include aerogel, silicate, silicon, or polyurethane (PU). For example, the insulation (122) may be composed of aerogel, silicate, silicon, or polyurethane (PU).

[0075] In embodiments, the insulation (122) may include one or more holes (122H). Specifically, the one or more holes (122H) may penetrate the insulation (122). For example, the one or more holes (122H) may overlap the anode (120P) and the cathode (120N).

[0076] In embodiments, ions may move through one or more holes (122H). Specifically, ions may move between the positive electrode (120P) and the negative electrode (120N) through one or more holes (122H) within the secondary battery (100). An insulating material (122) is disposed between the positive electrode (120P) and the negative electrode (120N), and ions may move through one or more holes (122H) formed in the insulating material (122).

[0077] One or more holes (122H) may have a size suitable for the movement of ions. For example, the size of one or more holes (122H) may be suitable for the movement of lithium ions (Li + ) may be larger than the size of the

[0078] Referring to FIG. 6, each of the one or more holes (122H) may include a circular shape. For example, each of the one or more holes (122H) may have a lithium ion (Li + ) may include a circular shape having a size larger than that of the hole (122H). For example, one or more holes (122H) may be arranged in the second direction (D2) and the third direction (D3).

[0079] In embodiments, the sum of the areas of one or more holes (122H) may be appropriately selected and designed according to the movement of ions and the resulting air permeability. For example, the sum of the areas of one or more holes (122H) may be about 30% to about 50% of the area of ​​each of the anode (120P) and / or cathode (120N) overlapping the insulation (122).

[0080]

[0081] The electrode assembly (120EA) described with reference to FIGS. 1 to 6 may include an insulating material (122) disposed between the positive electrode (120P) and the negative electrode (120N). This has the effect of delaying heat propagation that may occur between the positive electrode (120P) and the negative electrode (120N). In particular, when ignition occurs inside a secondary battery (100) which is a square cell, heat propagation between adjacent electrodes can be delayed. This can reduce the delay in heat propagation to adjacent cells and the risk of flames emitting outside the pack. In other words, the safety of the electrode assembly (120EA) can be improved.

[0082] The electrode assembly (120EA) described with reference to FIGS. 1 to 6 may include an insulating material (122) that may include one or more holes (122H). Accordingly, even if the insulating material (122) is placed between the anode (120P) and the cathode (120N), it provides a passage for ions to move through the one or more holes (122H), thereby improving ion permeability. In other words, the performance and reliability of the electrode assembly (120EA) may be improved.

[0083]

[0084] According to embodiments of the technical idea of ​​the present invention, an electrode assembly (120EA) with improved safety can be provided.

[0085] According to embodiments of the technical idea of ​​the present invention, an electrode assembly (120EA) with improved performance and reliability can be provided.

[0086] According to embodiments of the technical idea of ​​the present invention, a secondary battery (100) including an electrode assembly (120EA) with improved safety can be provided.

[0087] According to embodiments of the technical idea of ​​the present invention, a secondary battery (100) including an electrode assembly (120EA) with improved performance and reliability can be provided.

[0088]

[0089] (Example 2)

[0090] FIG. 7 is a plan view of an insulator (122A) of an electrode assembly (120EA) according to embodiments of the technical concept of the present invention. Below, the differences from the insulator (122) described with reference to FIG. 6 will be primarily explained.

[0091] Referring to FIG. 7, the insulation (122A) may include one or more holes (122AH). Each of the one or more holes (122AH) may have a rectangular shape. For example, each of the one or more holes (122AH) may be configured to have a lithium ion (Li + ) may include a square shape having a size larger than that of the hole (122AH). For example, one or more holes (122AH) may be arranged in the second direction (D2) and the third direction (D3).

[0092] The shape of one or more holes (122AH) of the insulation (122A) is not limited to the exemplified shape, and may have, for example, a rectangular, square, triangular, or oval shape.

[0093]

[0094] (Example 3)

[0095] FIG. 8 is a plan view of an insulating material (122B) of an electrode assembly (120EA) according to embodiments of the technical concept of the present invention. Below, the differences from the insulating material (122) described with reference to FIG. 6 will be primarily explained.

[0096] Referring to FIG. 8, the insulation (122B) may include one or more holes (122BH). For example, the one or more holes (122BH) may be arranged irregularly.

[0097]

[0098] (Example 4)

[0099] FIG. 9 is an enlarged cross-sectional view illustrating an electrode assembly (120EA_1) according to embodiments of the technical idea of ​​the present invention. Specifically, FIG. 9 is an enlarged cross-sectional view of the electrode assembly (120EA_1) corresponding to the EX1 region of FIG. 3. Hereinafter, differences from the electrode assembly (120EA) described with reference to FIGS. 1 to 6 will be mainly described.

[0100] Referring to FIG. 9, the electrode assembly (120EA_1) may include a first layer (S1_1) and a second layer (S2_1) each including an anode (120P), a separator (121), and a cathode (120N). Descriptions of the anode (120P), the separator (121), the insulator (122), and the cathode (120N) may refer to FIGS. 1 to 6.

[0101] The second layer (S2_1) may be connected to the first layer (S1_1) to form an outer portion of the electrode assembly (120EA_1) integrally. The second layer (S2_1) may be surrounded by the first layer (S1_1). The second layer (S2_1) may include a portion surrounded by the first layer (S1_1).

[0102] In the first layer (S1_1), the cathode (120N), the separator (121), and the anode (120P) may be arranged sequentially. In the second layer (S2_1), the cathode (120N), the separator (121), and the anode (120P) may be arranged sequentially.

[0103] A separator (121) and an insulator (122) may be placed between the anode (120P) of the first layer (S1_1) and the cathode (120N) of the second layer (S2_1). Specifically, the insulator (122) and the separator (121) may be sequentially placed between the anode (120P) of the first layer (S1_1) and the cathode (120N) of the second layer (S2_1).

[0104] For example, an insulating material (122) may be placed inside the anode (120P) of the first layer (S1_1), a separator (121) may be placed inside the insulating material (122), and a cathode (120N) of the second layer (S2_1) may be placed inside the separator (121). For example, an insulating material (122) may be placed inside the first layer (S1_1), a separator (121) may be placed inside the insulating material (122), and a second layer (S2_1) may be placed inside the separator (121).

[0105]

[0106] (Example 5)

[0107] Fig. 10 is an enlarged cross-sectional view illustrating an electrode assembly (120EA_2) according to embodiments of the technical idea of ​​the present invention. Specifically, Fig. 10 is an enlarged cross-sectional view of an electrode assembly (120EA_2) corresponding to the EX1 region of Fig. 3. Hereinafter, differences from the electrode assembly (120EA) described with reference to Figs. 1 to 6 will be mainly described.

[0108] Referring to FIG. 10, the electrode assembly (120EA_2) may include a first layer (S1_2) and a second layer (S2_2), which each include an anode (120P), a second insulator (122_2), a separator (121), and a cathode (120N). Descriptions of the anode (120P), the separator (121), the second insulator (122_2), and the cathode (120N) may refer to FIGS. 1 to 6. For example, the second insulator (122_2) may include one or more holes overlapping with the anode (120P) and the cathode (120N).

[0109] The second layer (S2_2) may be connected to the first layer (S1_2) to form an outer portion of the electrode assembly (120EA_2) integrally. The second layer (S2_2) may be surrounded by the first layer (S1_2). The second layer (S2_2) may include a portion surrounded by the first layer (S1_2).

[0110] In the first layer (S1_2), the cathode (120N), the second insulator (122_2), the separator (121), and the anode (120P) may be arranged in sequence. In the second layer (S2_2), the cathode (120N), the second insulator (122_2), the separator (121), and the anode (120P) may be arranged in sequence.

[0111] A separator (121) and a first insulating material (122_1) may be disposed between the anode (120P) of the first layer (S1_2) and the cathode (120N) of the second layer (S2_2). Specifically, the separator (121) and the first insulating material (122_1) may be sequentially disposed between the anode (120P) of the first layer (S1_2) and the cathode (120N) of the second layer (S2_2). For a description of the first insulating material (122_1), reference may be made to FIGS. 1 to 6. For example, the first insulating material (122_1) may include one or more holes overlapping with the anode (120P) and the cathode (120N).

[0112] For example, a separator (121) may be placed inside the anode (120P) of the first layer (S1_2), a first insulator (122_1) may be placed inside the separator (121), and a cathode (120N) of the second layer (S2_2) may be placed inside the first insulator (122_1). For example, a separator (121) may be placed inside the first layer (S1_2), a first insulator (122_1) may be placed inside the separator (121), and a second layer (S2_2) may be placed inside the first insulator (122_1).

[0113] For example, the cathode (120N), the second insulation (122_2), the separator (121), and the anode (120P) of the first layer (S1_2) may be arranged in sequence along one direction from the inner wall of the case (120C) toward the core of the electrode assembly (120EA), and the separator (121) and the first insulation (122_1) may be arranged, and the cathode (120N), the second insulation (122_2), the separator (121), and the anode (120P) of the second layer (S2_2) may be arranged in sequence.

[0114]

[0115] (Example 6)

[0116] Fig. 11 is an enlarged cross-sectional view illustrating an electrode assembly (120EA_3) according to embodiments of the technical idea of ​​the present invention. Specifically, Fig. 11 is an enlarged cross-sectional view of an electrode assembly (120EA_3) corresponding to the EX1 region of Fig. 3. Hereinafter, differences from the electrode assembly (120EA) described with reference to Figs. 1 to 6 will be mainly described.

[0117] Referring to FIG. 11, the electrode assembly (120EA_3) may include a first layer (S1_3) and a second layer (S2_3) each including an anode (120P), a separator (121), a second insulator (122_2), and a cathode (120N). Descriptions of the anode (120P), the separator (121), the insulator (122), and the cathode (120N) may refer to FIGS. 1 to 6.

[0118] The second layer (S2_3) may be connected to the first layer (S1_3) to form an outer portion of the electrode assembly (120EA_4) integrally. The second layer (S2_3) may be surrounded by the first layer (S1_3). The second layer (S2_3) may include a portion surrounded by the first layer (S1_3).

[0119] In the first layer (S1_3), the cathode (120N), the separator (121), the second insulator (122_2), and the anode (120P) may be arranged in sequence. In the second layer (S2_3), the cathode (120N), the separator (121), the second insulator (122_2), and the anode (120P) may be arranged in sequence.

[0120] A separator (121) and a first insulation material (122_1) may be arranged between the anode (120P) of the first layer (S1_3) and the cathode (120N) of the second layer (S2_3). Specifically, the separator (121) and the first insulation material (122_1) may be arranged sequentially between the anode (120P) of the first layer (S1_3) and the cathode (120N) of the second layer (S2_3).

[0121] For example, a separator (121) may be placed inside the anode (120P) of the first layer (S1_3), a first insulator (122_1) may be placed inside the separator (121), and a cathode (120N) of the second layer (S2_3) may be placed inside the first insulator (122_1). For example, a separator (121) may be placed inside the first layer (S1_3), a first insulator (122_1) may be placed inside the separator (121), and a second layer (S2_3) may be placed inside the first insulator (122_1).

[0122]

[0123] (Example 7)

[0124] Fig. 12 is a cross-sectional view of an electrode assembly (120EA_4) according to embodiments of the technical idea of ​​the present invention. Specifically, Fig. 12 is a cross-sectional view of the electrode assembly (120EA_4) corresponding to a cross-section along line AA of Fig. 2.

[0125] Fig. 13 is an enlarged cross-sectional view illustrating an electrode assembly (120EA_4) according to embodiments of the technical idea of ​​the present invention. Fig. 13 is an enlarged cross-sectional view of the EX2 area of ​​Fig. 12.

[0126] Hereinafter, the differences from the electrode assembly (120EA) described with reference to FIGS. 1 to 6 will be mainly explained.

[0127] Referring to FIGS. 12 and 13, the electrode assembly (120EA_4) may include an anode (120P), a separator (121), an insulator (122), and a cathode (120N). Descriptions of the anode (120P), the separator (121), the insulator (122), and the cathode (120N) may refer to FIGS. 1 to 6.

[0128] As illustrated in Fig. 12, in a jelly roll type electrode assembly (120EA), the anode (120P) is positioned at the outermost side, and a separator (121) and a cathode (120N) are positioned inside the anode (120P). A separator (121) may be positioned again inside the cathode (120N), and an insulating material (122) and the anode (120P) may be positioned thereon.

[0129] For example, the anode (120P) can surround other components in a first direction (D1) and a second direction (D2). In particular, the anode (120P) can surround the separator (121) in a first direction (D1) and a second direction (D2), and the separator (121) can then surround the cathode (120N) in the first direction (D1) and the second direction (D2).

[0130] As illustrated in Fig. 13, within the EX2 region including the first direction (D1) and the second direction (D2), the cathode (120N), the separator (121), the insulator (122), and the anode (120P) can be laminated in the first direction (D1). Within the EX2 region, the cathode (120N), the separator (121), the insulator (122), and the anode (120P) can overlap in the first direction (D1).

[0131] In embodiments, the electrode assembly (120EA) may include a first layer (S1_4) and a second layer (S2_4), each including a positive electrode (120P), a separator (121), and a negative electrode (120N). The second layer (S2_4) may be connected to the first layer (S1_4) to integrally form an outer portion of the electrode assembly (120EA). The second layer (S2_4) may be surrounded by the first layer (S1_4). The second layer (S2_4) may include a portion surrounded by the first layer (S1_4).

[0132] In the first layer (S1_4), the anode (120P), the separator (121), and the cathode (120N) may be arranged sequentially. In the first layer (S1_4), the anode (120P) may be arranged on the outside, and the separator (121) and the cathode (120N) may be arranged sequentially on the inside of the anode (120P). For example, the first layer (S1_4) may not include an insulating material (122).

[0133] In the second layer (S2_4), the anode (120P), the separator (121), and the cathode (120N) may be arranged in sequence. In the second layer (S2_4), the anode (120P) may be arranged on the outside, and the separator (121) and the cathode (120N) may be arranged in sequence on the inside of the anode (120P).

[0134] A separator (121) and an insulator (122) may be placed between the cathode (120N) of the first layer (S1_4) and the anode (120P) of the second layer (S2_4). Specifically, the separator (121) and the insulator (122) may be sequentially placed between the cathode (120N) of the first layer (S1_4) and the anode (120P) of the second layer (S2_4).

[0135] For example, a separator (121) may be placed inside the cathode (120N) of the first layer (S1_4), an insulator (122) may be placed inside the separator (121), and an anode (120P) of the second layer (S2_4) may be placed inside the insulator (122). For example, a separator (121) may be placed inside the first layer (S1_4), an insulator (122) may be placed inside the separator (121), and a second layer (S2_4) may be placed inside the insulator (122).

[0136] The first layer (S1_4) may constitute the outermost portion of the electrode assembly (120EA). In particular, the cathode (120N) of the first layer (S1_4) may be positioned at the outermost portion of the electrode assembly (120EA). In embodiments, the electrode assembly (120EA) may include an insulating material (122), and the cathode (120P), the separator (121), and the cathode (120N) may be positioned at the outermost portion, and the insulating material (122) may be positioned inside thereof.

[0137]

[0138] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. Contains a positive electrode, a negative electrode, and a separator and an insulator therebetween, The above insulation material includes one or more holes overlapping the anode and the cathode, configured to allow ions to move through the one or more holes, An electrode assembly of jelly roll type, wound around the first direction as an axis.

2. In paragraph 1, An electrode assembly in which the cathode, the separator, the insulation, and the anode are arranged in sequence.

3. In paragraph 1, An electrode assembly in which the cathode, the insulation, the separator, and the anode are arranged in sequence.

4. In paragraph 1, A first layer and a second layer integrally connected to the first layer and including a portion surrounded by the first layer, The first layer is arranged in sequence with the cathode, the separator, and the anode, The second layer is arranged in sequence with the cathode, the separator, and the anode, An electrode assembly, wherein the insulating material is placed between the anode of the first layer and the cathode of the second layer.

5. In paragraph 1, An electrode assembly, wherein the insulating material comprises one or more materials selected from aerogel, silicate, silicon, and polyurethane (PU).

6. In paragraph 1, An electrode assembly, wherein said one or more holes comprise one or more shapes selected from a circle, a square, and a triangle.

7. In paragraph 1, An electrode assembly, wherein the sum of the areas of the one or more holes in the insulating material is 30% to 50% of the area of ​​the anode.

8. Case; An electrode assembly housed within the case, comprising an anode, a cathode, and a separator therebetween and a first insulating material; and Contains electrolyte, The first insulating material includes one or more first holes overlapping the electrode, configured to allow ions to move through the one or more first holes, A secondary battery, wherein the electrode assembly is a jelly roll type wound around the first direction as an axis.

9. In paragraph 8, Along one direction from the inner wall of the case toward the core of the electrode assembly, A secondary battery in which the cathode, the separator, the anode, and the first insulating material are arranged in sequence.

10. In paragraph 8, Further comprising a second insulating material disposed between at least one selected from between the cathode and the separator and between the separator and the anode; A secondary battery, wherein the second insulating material includes one or more second holes overlapping the positive electrode and the negative electrode.

11. In paragraph 8, The above case is a can in a secondary battery.

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