Electrode lead assembly and secondary battery

Abstract

The present invention relates to a secondary battery including: an electrode assembly; an electrode tab electrically connected to the electrode assembly and bent to be in close contact with an end portion of the electrode assembly; a pouch member provided to surround a periphery of the electrode assembly; an electrode lead including a first lead portion and a second lead portion, the first lead portion being accommodated inside the pouch member to be stacked on the electrode tab and electrically connected to the electrode tab, the second lead portion having one end portion connected to the first lead portion and the other end portion exposed to the outside of the pouch member; and a protector provided to surround a rim of the first lead portion, whereby advantageous effects of minimizing damage to the pouch member and improving stability and reliability can be obtained.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0180616, filed with the Korean Intellectual Property Office on December 6, 2024, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0004] This disclosure relates to electrode lead assemblies and secondary batteries, and more specifically to electrode lead assemblies and secondary batteries that can minimize damage to pouches and improve stability and reliability. Background Technology

[0005] With the development of electric vehicles, energy storage systems (ESS), and portable electronic devices, the demand for lithium-ion batteries as an energy source is rapidly increasing.

[0006] Lithium secondary batteries can be classified into pouch type and can type according to the material of the casing (external material) that houses the electrode components, and the electrode components can be classified into wound type (gel roll type), stacked type, stacked and laminated type or stacked and folded type according to the manufacturing method and shape.

[0007] Among these batteries, pouch-type secondary batteries have attracted much attention because they use a pouch-shaped component made of flexible polymer material to form the exterior of the battery. This significantly reduces the weight of the battery compared to cylindrical or prismatic batteries that use metal cans, thus enabling lightweight batteries and having the advantage of being able to be made into various shapes.

[0008] In a pouch-type secondary battery, electrode assemblies are stacked and housed inside a pouch-like structure. Electrode tabs and electrode leads are connected to the electrode assemblies, and the electrode leads protrude from the pouch-like structure. The electrode leads are electrically connected to an external device via contact to receive power from the external device.

[0009] Meanwhile, recently, as a method to maximize the volumetric efficiency or volumetric energy density of secondary batteries, a method is being considered to connect electrode leads to electrode contacts while bending the electrode contacts to make close contact with the ends of the electrode assembly, so as to minimize the platform area (edge ​​area) of the pouch.

[0010] However, conventionally, the following problem exists: the bag-shaped component is deformed or damaged due to interference (contact) between the electrode leads, which are electrically connected to the electrode tabs inside the bag-shaped component and the bag-shaped component itself.

[0011] Furthermore, if the pouch is deformed or damaged, the electrolyte may leak, which can lead to problems such as reduced performance and lifespan of the secondary battery, as well as an increased risk of explosion.

[0012] Therefore, various studies have been conducted recently to minimize the damage and deformation of bag-shaped components while minimizing the platform area (edge ​​area) of the bag-shaped component. However, these studies are still insufficient and require further development. Summary of the Invention

[0013] Technical issues

[0014] Embodiments of this disclosure are intended to provide electrode lead assemblies and secondary batteries that can minimize damage to pouch-like components and improve stability and reliability.

[0015] In particular, embodiments of this disclosure are intended to minimize interference and contact between the electrode leads and the pouch, and to minimize damage and deformation of the pouch.

[0016] Most importantly, the embodiments of this disclosure aim to minimize damage and deformation of the bag-shaped member due to interference between the electrode leads and the bag-shaped member, in a structure in which the electrode tabs are bent into close contact with the ends of the electrode assembly to minimize the platform region (edge ​​region) of the bag-shaped member.

[0017] The problems to be solved in the implementation are not limited to these, and may also include objectives or effects that can be identified from the solutions to these problems or the implementation methods.

[0018] Technical solution

[0019] According to a preferred embodiment of the present disclosure for achieving the above-described objectives, the secondary battery includes: an electrode assembly; an electrode tab electrically connected to the electrode assembly and bent to be in close contact with an end of the electrode assembly; a pouch-like member disposed around the periphery of the electrode assembly; an electrode lead including a first lead portion and a second lead portion, the first lead portion being electrically connected to the electrode tab and housed inside the pouch-like member to be stacked on the electrode tab, the second lead portion having one end connected to the first lead portion and another end exposed to the outside of the pouch-like member; and a protector disposed around the edge of the first lead portion.

[0020] This is to minimize damage to the bag-shaped components and improve stability and reliability.

[0021] In other words, recently, a method has been considered to connect electrode leads to electrode contacts while bending the electrode contacts to make close contact with the ends of the electrode assembly, in order to minimize the platform area (edge ​​area) of the pouch. However, conventionally, there is a problem: the pouch can deform or be damaged due to interference (contact) between the electrode leads, which are electrically connected to the electrode contacts and housed inside the pouch, and the pouch itself. Furthermore, if the pouch deforms or is damaged, the electrolyte may leak, leading to problems that not only reduce the performance and lifespan of the secondary battery but also increase the risk of explosion.

[0022] However, by arranging the protector around the edge of the first lead portion of the electrode lead housed inside the pouch, embodiments of this disclosure can achieve the beneficial effects of minimizing interference and contact between the electrode lead and the pouch, as well as minimizing damage and deformation of the pouch.

[0023] Most importantly, the embodiments of this disclosure can achieve the following beneficial effects: while minimizing the platform area (edge ​​area) of the bag-shaped component, damage and deformation of the bag-shaped component caused by interference between the electrode leads and the bag-shaped component are also minimized.

[0024] The first lead portion and the second lead portion can be connected in various ways according to the required conditions and design specifications.

[0025] According to a preferred embodiment of the present disclosure, the secondary battery may include a connecting lead portion that is bent relative to the first lead portion and the second lead portion between the first lead portion and the second lead portion and continuously connects the first lead portion and the second lead portion.

[0026] According to another embodiment of this disclosure, the first lead portion and the second lead portion can be integrally connected by soldering.

[0027] According to a preferred embodiment of the present disclosure, the secondary battery may include at least one of the following: a first guide groove formed in a first lead portion to allow electrode contacts to be exposed; and a second guide groove formed in a connecting lead portion to allow electrode contacts to be exposed.

[0028] The protector can be configured in various ways to surround the edge of the first lead portion.

[0029] According to a preferred embodiment of the present disclosure, the protector may include a first protector member configured to surround the edge of the central region of the first lead portion.

[0030] The first protector component can be configured as various structures capable of surrounding the edge of the central region of the first lead portion.

[0031] According to a preferred embodiment of the present disclosure, the first protector component may include: a first protector body configured to cover a surface of the electrode-facing tab of the first lead portion; and a first protector protrusion disposed at an end of the first protector body and defining a first receiving groove, wherein the edge of the central region of the first lead portion is received in the first receiving groove.

[0032] According to a preferred embodiment of this disclosure, a first gap may be defined between a surface of the electrode-facing tab of the first lead portion and the electrode assembly via a first protector member.

[0033] In this way, by defining a first gap (space) between a surface of the first lead portion and the electrode assembly via the first protector member, embodiments of the present disclosure can achieve the following beneficial effects: minimizing mutual interference (contact) between the first lead portion and the electrode assembly and minimizing deformation and damage to the first lead portion and the electrode assembly caused by interference between the first lead portion and the electrode assembly.

[0034] According to a preferred embodiment of the present disclosure, the protector may include a second protector member configured to surround the edge of a side region of the first lead portion.

[0035] The second protector component can be configured as various structures capable of surrounding the edge of the side region of the first lead portion.

[0036] According to a preferred embodiment of the present disclosure, the second protector component may include: a second protector body formed along the edge of the side region of the first lead portion; and a second protector protrusion disposed on the second protector body and defining a second receiving groove, the edge of the side region of the first lead portion being received in the second receiving groove.

[0037] According to a preferred embodiment of this disclosure, a second gap may be defined between the other surface of the first lead portion facing the bag-shaped member and the bag-shaped member via a second protector member.

[0038] In this way, by defining a second gap (space) between the other surface of the first lead portion and the bag-like member via the second protector member, the embodiments of this disclosure can achieve the following beneficial effects: minimizing mutual interference (contact) between the first lead portion and the bag-like member and minimizing deformation and damage to the bag-like member caused by interference between the first lead portion and the bag-like member.

[0039] According to a preferred embodiment of this disclosure, the protector may be configured to be selectively detachable from the first lead portion.

[0040] According to another preferred embodiment of this disclosure, the protector can be formed into an integral body with the first lead portion by double injection molding.

[0041] According to another preferred aspect of this disclosure, an electrode lead assembly for a secondary battery includes: an electrode lead comprising a first lead portion and a second lead portion, the first lead portion being electrically connected to an electrode tab and housed inside a pouch to be stacked on the electrode tab, the second lead portion having one end connected to the first lead portion and another end exposed to the outside of the pouch; and a protector configured to surround the edge of the first lead portion, the secondary battery including: an electrode assembly; an electrode tab electrically connected to the electrode assembly and bent to be in close contact with an end of the electrode assembly; and a pouch configured to surround the periphery of the electrode assembly.

[0042] According to another preferred aspect of this disclosure, the protector may include at least one of the following: a first protector member disposed around the edge of a central region of the first lead portion; and a second protector member disposed around the edge of a side region of the first lead portion.

[0043] According to another preferred aspect of this disclosure, the first protector component may include: a first protector body configured to cover a surface of the electrode-facing tab of the first lead portion; and a first protector protrusion disposed at an end of the first protector body and defining a first receiving groove, wherein the edge of the central region of the first lead portion is received in the first receiving groove.

[0044] According to another preferred aspect of this disclosure, the second protector component may include: a second protector body formed along the edge of a side region of the first lead portion; and a second protector protrusion disposed on the second protector body and defining a second receiving groove, the edge of the side region of the first lead portion being received in the second receiving groove.

[0045] According to another preferred aspect of this disclosure, a first gap may be defined between one surface of the first lead portion facing the electrode tab and the electrode assembly via a first protector member, and a second gap may be defined between the other surface of the first lead portion facing the pouch and the pouch via a second protector member.

[0046] According to another preferred aspect of this disclosure, the electrode lead assembly may include a connecting lead portion that is bent relative to a first lead portion and a second lead portion and continuously connects the first lead portion and the second lead portion.

[0047] According to another preferred aspect of this disclosure, the electrode lead assembly may include at least one of the following: a first guide groove formed in a first lead portion to allow electrode tabs to be exposed; and a second guide groove formed in a connecting lead portion to allow electrode tabs to be exposed.

[0048] Beneficial effects

[0049] As described above, according to the embodiments of this disclosure, beneficial effects can be obtained in minimizing damage to the bag-shaped component and improving stability and reliability.

[0050] In particular, according to embodiments of this disclosure, the beneficial effects of minimizing interference and contact between the electrode leads and the bag-shaped member, as well as minimizing damage and deformation of the bag-shaped member, can be obtained.

[0051] Most importantly, according to embodiments of this disclosure, the beneficial effect of minimizing damage and deformation of the bag-shaped member due to interference between the electrode leads and the bag-shaped member can be obtained in a structure in which the electrode tabs are bent into close contact with the ends of the electrode assembly to minimize the platform region (edge ​​region) of the bag-shaped member. Attached Figure Description

[0052] Figure 1 This is a diagram used to describe a secondary battery according to an embodiment of the present disclosure.

[0053] Figure 2 This is a perspective view illustrating the electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0054] Figure 3 This is a diagram illustrating the electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0055] Figure 4 This is a diagram illustrating a protector in a secondary battery according to an embodiment of the present disclosure.

[0056] Figure 5 This is a diagram illustrating the process of assembling a protector and electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0057] Figure 6 This is a diagram illustrating the electrode contacts in a secondary battery according to an embodiment of the present disclosure.

[0058] Figure 7 This is a diagram illustrating the process of connecting electrode leads and electrode contacts in a secondary battery according to an embodiment of the present disclosure.

[0059] Figure 8This is a diagram illustrating the electrode contacts in a secondary battery according to an embodiment of the present disclosure.

[0060] Figure 9 This is a diagram illustrating a first modified example of electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0061] Figure 10 This is a perspective view illustrating a second modified example of electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0062] Figure 11 This is an expanded view illustrating a second modified example of electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0063] Figure 12 This is a perspective view illustrating a third modified example of electrode leads in a secondary battery according to an embodiment of the present disclosure.

[0064] Figure 13 This is an unfolded diagram illustrating a third modified example of electrode leads in a secondary battery according to an embodiment of the present disclosure. Detailed Implementation

[0065] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0066] However, the technical concept of this disclosure is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical concept of this disclosure, one or more components between embodiments can be selectively combined or replaced.

[0067] Furthermore, unless explicitly defined and described, the terms (including technical and scientific terms) used in the embodiments of this disclosure may be interpreted as meaning commonly understood by one of ordinary skill in the art to which this disclosure pertains, and commonly used terms, such as those defined in dictionaries, may be interpreted in light of the contextual meaning of the relevant art.

[0068] Furthermore, the terminology used in the embodiments of this disclosure is for the purpose of describing the embodiments and is not intended to limit this disclosure.

[0069] In this specification, unless specifically stated in the phrase, the singular form may include the plural form, and when described as “at least one (or more than one) of A, B, and C”, it may include one or more of all combinations that can be combined with A, B, and C.

[0070] In addition, when describing the components of embodiments of this disclosure, terms such as first, second, A, B, (a), (b) may be used.

[0071] These terms are intended only to distinguish components from other components and do not limit the nature, order, or sequence of the corresponding components.

[0072] Furthermore, when a component is described as being “connected,” “linked,” or “in contact” with another component, this includes not only cases where the component is directly connected, linked, or in contact with another component, but also cases where the component is “connected,” “linked,” or “in contact” with another component through a third component.

[0073] Additionally, when the component is described as being formed or disposed "on top (above) or bottom (below)" of each component, "top (above)" or "bottom (below)" can include not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or disposed between two components. Furthermore, when expressed as "on top (above) or bottom (below)," this can include the meaning of upward and downward directions based on a component.

[0074] Reference Figures 1 to 13 The secondary battery 10 according to an embodiment of the present disclosure includes: an electrode assembly 110; an electrode tab 120 electrically connected to the electrode assembly 110 and bent to be in close contact with an end of the electrode assembly 110; a pouch 130 disposed around the periphery of the electrode assembly 110; an electrode lead 200 including a first lead portion 210 and a second lead portion 220, the first lead portion 210 being electrically connected to the electrode tab 120 and housed inside the pouch 130 to be stacked on the electrode tab 120, the second lead portion 220 having one end connected to the first lead portion 210 and another end exposed outside the pouch 130; and a protector 300 disposed around the edge of the first lead portion 210.

[0075] Reference Figure 1 The electrode assembly 110 can be configured in various structures according to the required conditions and design specifications, and this disclosure is not limited or constrained by the structure of the electrode assembly 110.

[0076] For reference, electrode assembly 110 may include electrodes (not shown) and spacers (not shown) laminated on the electrodes.

[0077] For example, the electrodes may include: a first electrode (e.g., a positive electrode) laminated on one surface (e.g., a top surface) of the separator; and a second electrode (e.g., a negative electrode) laminated on another surface (e.g., a bottom surface) of the separator.

[0078] The first electrode (positive electrode) and the second electrode (negative electrode) can be formed by applying a slurry obtained by mixing electrode active materials, binders and plasticizers to the positive electrode current collector and the negative electrode current collector.

[0079] There are no particular restrictions on the positive current collector, as long as it is conductive and will not cause chemical changes in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel with surface treatments of carbon, nickel, titanium, silver, etc., can be used as the positive current collector.

[0080] The negative electrode current collector is not particularly limited, as long as it is conductive and does not cause chemical changes in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc., can be used as the negative electrode current collector. For example, a thin copper film (e.g., electrolytic copper foil or pressurized copper foil) can be used as the negative electrode current collector.

[0081] The separator is designed to separate the negative electrode from the positive electrode and provide a channel for the movement of lithium ions. The separator can be used without any particular restrictions, as long as it is typically used as a separator in a lithium secondary battery 10.

[0082] For example, as a separator, a porous polymer membrane, such as a porous polymer membrane made of a polyolefin-based polymer, or a stacked structure of two or more layers thereof, can be used. Polyolefin-based polymers include ethylene homopolymers, propylene homopolymers, ethylene / butene copolymers, ethylene / hexene copolymers, and ethylene / methacrylate copolymers.

[0083] Alternatively, conventional porous nonwoven fabrics, such as those made of high-melting-point glass fibers, polyethylene terephthalate fibers, or the like, can be used as separators, or separators coated with ceramic components or polymer materials can be used to ensure heat resistance or mechanical strength.

[0084] The electrode tab 120 is electrically connected to the electrode assembly 110 and bent to make close contact with the end of the electrode assembly 110.

[0085] In embodiments of this disclosure, the term "electrode contact 120" is defined as including a positive electrode contact 120 electrically connected to the positive electrode and a negative electrode contact 120 electrically connected to the negative electrode.

[0086] The following example will be described: In this example, electrode tabs 120 are disposed at each of the two ends along the length direction (total length direction) of electrode assembly 110.

[0087] Electrode tab 120 may be formed of conventional metallic materials (e.g., copper, aluminum) that can be electrically connected to electrode assembly 110, and this disclosure is not limited or constrained by the material or characteristics of electrode tab 120.

[0088] Furthermore, in embodiments of this disclosure, when the electrode contact 120 is bent to make close contact with the end of the electrode assembly 110, it is understood that the electrode contact 120 is bent in a direction perpendicular to the length direction (total length direction) of the electrode assembly 110 and makes close contact with the end of the electrode assembly 110 (see [link to documentation]). Figure 6 ).

[0089] This is to maximize the volumetric efficiency or volumetric energy density of the secondary battery 10, and to minimize the platform area (edge ​​area) of the pouch 130 by allowing the electrode tabs 120 to bend into close contact with the ends of the electrode assembly 110.

[0090] Reference Figure 1 The bag-shaped component 130 is configured to protect components such as electrode assembly 110 and electrolyte, while supplementing the electrochemical performance achieved by electrode assembly 110 and electrolyte and ensuring heat dissipation.

[0091] The pouch 130 can be configured in various ways to completely surround the periphery of the electrode assembly 110, and this disclosure is not limited or constrained by the structure of the pouch 130.

[0092] For example, the pouch 130 can be configured by combining a lower sheet and an upper sheet, which define a receiving space for housing the electrode assembly 110 therein.

[0093] For example, the bag-shaped piece 130 can be manufactured by joining the side portion (edge) of the lower sheet and the side portion (edge) of the upper sheet, and when the side portion of the lower sheet and the side portion of the upper sheet are joined, a sealing portion can be formed on the side (edge ​​side) of the bag-shaped piece 130.

[0094] The bag 130 can be made of various materials depending on the required conditions and design specifications, and this disclosure is not limited or constrained by the material and characteristics of the bag 130.

[0095] For example, the bag-shaped component 130 can be configured as a multilayer membrane structure in which an inner layer, an intermediate layer, and an outer layer are laminated. For example, a polyolefin resin layer as a heat-sealing layer can be used as the inner layer, which has heat-sealing properties and serves as a sealing material; an aluminum layer as a metal layer can be used as the intermediate layer, which serves both as a substrate to maintain mechanical strength and as a barrier layer to resist moisture and oxygen; and a nylon layer, which serves as both a substrate and a protective layer, can be used as the outer layer.

[0096] Reference Figures 1 to 8 Electrode leads 200 and protectors 300 are provided to form an electrode lead assembly 20 that connects electrode contacts 120 to an external power source.

[0097] More specifically, the electrode lead 200 includes: a first lead portion 210 electrically connected to the electrode tab 120 and housed inside the pouch 130 to be stacked on the electrode tab 120; and a second lead portion 220 having one end connected to the first lead portion 210 and another end exposed outside the pouch 130.

[0098] The first lead portion 210 and the second lead portion 220 may be formed of conventional metallic materials (e.g., copper, aluminum) that can be electrically connected to the electrode contacts 120, and this disclosure is not limited or constrained by the materials and characteristics of the first lead portion 210 and the second lead portion 220.

[0099] The first lead portion 210 is electrically connected to the electrode tab 120 and can be configured to be housed inside the pouch 130 to be stacked on the electrode tab 120 in various structures, and this disclosure is not limited or constrained by the structure and shape of the first lead portion 210.

[0100] For example, the first lead portion 210 may be formed in a generally flat rectangular sheet shape, and the first lead portion 210 may be in close contact with the outer surface of the electrode tab 120 that is bent relative to the electrode assembly 110 to form a surface contact. According to another embodiment of the present disclosure, the first lead portion may be formed in an elliptical shape or other shapes.

[0101] The second lead portion 220 can be configured in various ways, having one end connected to the first lead portion 210 and another end exposed to the outside of the pouch 130, and this disclosure is not limited or constrained by the structure and shape of the second lead portion 220.

[0102] For example, the second lead portion 220 can be formed into a generally flat rectangular sheet shape.

[0103] Preferably, the second lead portion 220 can be configured to be perpendicular to the first lead portion 210.

[0104] The first lead portion 210 and the second lead portion 220 may be connected in various ways according to the required conditions and design specifications, and this disclosure is not limited or constrained by the connection structure of the first lead portion 210 and the second lead portion 220.

[0105] Reference Figures 1 to 3According to a preferred embodiment of the present disclosure, the secondary battery 10 may include a connecting lead portion 230, which is bent relative to the first lead portion 210 and the second lead portion 220 between the first lead portion 210 and the second lead portion 220 and continuously connects the first lead portion 210 and the second lead portion 220.

[0106] The connecting lead portion 230 can be configured in various ways to continuously connect the first lead portion 210 and the second lead portion 220, and this disclosure is not limited or constrained by the structure and shape of the connecting lead portion 230.

[0107] For example, the connecting lead portion 230 can be formed to have a generally "L" shape to continuously connect the first lead portion 210 and the second lead portion 220.

[0108] The following example will be described: In this example, the connecting lead portion 230 includes a first connecting lead portion (see Figure 13 230a) and the second connecting lead portion (see 230a) Figure 13 The first connecting lead portion 230a and the second connecting lead portion 230b are bent in opposite directions (for example, the first connecting lead portion is bent to be disposed on one surface of the second lead portion, and the second connecting lead portion is bent to be disposed on the other surface of the second lead portion). According to another embodiment of the present disclosure, the first connecting lead portion and the second connecting lead portion may be configured to be bent in the same direction.

[0109] According to a preferred embodiment of the present disclosure, the first lead portion 210, the connecting lead portion 230, and the second lead portion 220 constituting the electrode lead 200 can be formed by continuously bending a single lead portion substrate.

[0110] In the embodiments described and illustrated above in this disclosure, the following example is described: in this example, the first lead portion 210 and the second lead portion 220 are continuously connected by a connecting lead portion 230 (e.g., the first lead portion, the connecting lead portion and the second lead portion are formed by continuously bending a single lead portion fabric), but according to another embodiment of this disclosure, the separately manufactured first lead portion 210 and the second lead portion 220 can be integrally connected by welding.

[0111] In other words, referencing Figure 9 According to another embodiment of the present disclosure, the electrode lead 200 includes a first lead portion 210 and a second lead portion 220, wherein the first lead portion 210 and the second lead portion 220 can be integrally connected by welding (e.g., laser welding or spot welding).

[0112] According to a preferred embodiment of the present disclosure, the secondary battery 10 may include at least one of the following: a first guide groove 240 formed in a first lead portion 210 to allow the electrode tab 120 to be exposed; and a second guide groove 250 formed in a connecting lead portion 230 to allow the electrode tab 120 to be exposed.

[0113] The following example will be described below: In this example, a first guide groove 240 is formed in a first lead portion 210 and a second guide groove 250 is formed in a connecting lead portion 230.

[0114] The first guide groove 240 and the second guide groove 250 are configured to fix the welding portion (area) of the electrode lead 200 relative to the electrode tab 120, and to more stably maintain the arrangement of the electrode lead 200 relative to the electrode tab 120.

[0115] In other words, while the first lead portion 210 is stacked on the electrode tab 120, a portion of the electrode tab 120 can be exposed through the first guide groove 240 and the second guide groove 250, and the first lead portion 210 and the electrode tab 120 can be soldered through the first guide groove 240 and the second guide groove 250.

[0116] The first guide groove 240 and the second guide groove 250 can be configured with various structures according to the required conditions and design specifications, and this disclosure is not limited or constrained by the structure and shape of the first guide groove 240 and the second guide groove 250.

[0117] For example, the first guide groove 240 can be formed in a generally linear groove shape and can be formed along the central portion of the first lead portion 210.

[0118] The second guide groove 250 can be formed in a generally linear groove shape, and a plurality of second guide grooves 250 can be formed to be spaced apart at predetermined intervals along the length direction of the first lead portion 210. Preferably, the second guide grooves 250 can be formed symmetrically on both sides of the connecting lead portion 230 based on the first guide groove 240.

[0119] The protector 300 is configured to minimize interference and contact between the electrode lead 200 and the pouch 130, minimize damage and deformation of the pouch 130, and the protector 300 is configured to surround the edge of the first lead portion 210.

[0120] In other words, conventionally, the following problem exists: due to interference (contact) between the electrode leads 200 housed inside the pouch 130 and the pouch 130 itself, the pouch 130 may deform or be damaged. Furthermore, if the pouch 130 is deformed or damaged, the electrolyte may leak, leading to problems that not only reduce the performance and lifespan of the secondary battery but also increase the risk of explosion.

[0121] However, by arranging the protector 300 around the edge of the first lead portion 210 housed inside the pouch 130, embodiments of this disclosure can achieve the beneficial effects of minimizing interference and contact between the electrode lead 200 and the pouch 130, as well as minimizing damage and deformation of the pouch 130.

[0122] The protector 300 can be configured in various ways to surround the edge of the first lead portion 210, and this disclosure is not limited or constrained by the structure of the protector 300.

[0123] For reference, in embodiments of this disclosure, when the protector 300 surrounds the edge of the first lead portion 210, the protector 300 is defined as including a protector 300 that completely surrounds the edge of the first lead portion 210 and a protector 300 that partially surrounds the edge of the first lead portion 210.

[0124] According to a preferred embodiment of the present disclosure, the protector 300 may include a first protector member 310, which is configured to surround the edge of the central region of the first lead portion 210.

[0125] The first protector component 310 may be configured in various ways to surround the edge of the central region of the first lead portion 210, and this disclosure is not limited or constrained by the structure of the first protector component 310.

[0126] According to a preferred embodiment of the present disclosure, the first protector component 310 may include: a first protector body 312, the first protector body 312 being configured to cover a surface of the first lead portion 210 facing the electrode tab 120; and a first protector protrusion 314, the first protector protrusion 314 being disposed at an end of the first protector body 312 and defining a first receiving groove 314a, the edge of the central region of the first lead portion 210 being received in the first receiving groove 314a.

[0127] The first protector body 312 can be configured in various ways to cover one surface of the electrode-facing tab 120 of the first lead portion 210, and this disclosure is not limited or constrained by the structure and shape of the first protector body 312.

[0128] For example, the first protector body 312 can be configured to have a generally rectangular plate shape. According to another embodiment of this disclosure, the first protector body can be formed in a circular shape or other shapes.

[0129] A first protector protrusion 314 is provided at the end of the first protector body 312 to define a first receiving groove 314a, and the edge of the central region of the first lead portion 210 is received in the first receiving groove 314a.

[0130] The first protector protrusion 314 can be configured in various ways to define the first receiving groove 314a, and this disclosure is not limited or constrained by the structure of the first protector protrusion 314.

[0131] For example, the first protector protrusion 314 can be vertically disposed at each of the upper and lower ends of the first protector body 312 (based on...). Figure 3 Furthermore, the first protector protrusion 314 and the first protector body 312 can together form a first receiving groove 314a in a generally "U" shape.

[0132] In the embodiments described and illustrated above in this disclosure, the following example is described: in this example, the first protector protrusion 314 is provided at each of the upper and lower ends of the first protector body 312; however, according to another embodiment of this disclosure, the first protector protrusion may be formed in a vertical direction at only one of the upper and lower ends of the first protector body.

[0133] According to a preferred embodiment of the present disclosure, a first gap 314b may be defined between a surface of the electrode-facing tab 120 of the first lead portion 210 and the electrode assembly 110 via the first protector member 310.

[0134] Here, the first gap 314b can be understood as the gap between a surface of the first lead portion 210 and the electrode assembly 110 defined by the thickness of the first protector protrusion 314.

[0135] In this way, by defining a first gap 314b (space) between a surface of the first lead portion 210 and the electrode assembly 110 via the first protector member 310, the embodiments of the present disclosure can achieve the following beneficial effects: minimizing mutual interference (contact) between the first lead portion 210 and the electrode assembly 110 and minimizing deformation and damage to the first lead portion 210 and the electrode assembly 110 due to interference between the first lead portion 210 and the electrode assembly 110.

[0136] According to a preferred embodiment of the present disclosure, the protector 300 may include a second protector member 320, which is configured to surround the edge of the side region of the first lead portion 210.

[0137] The second protector component 320 may be configured in various ways to surround the edge of the side region of the first lead portion 210, and this disclosure is not limited or constrained by the structure of the second protector component 320.

[0138] According to a preferred embodiment of the present disclosure, the second protector member 320 may include: a second protector body 322 formed along the edge of the side region of the first lead portion 210; and a second protector protrusion 324 disposed on the second protector body 322 and defining a second receiving groove 324a, the edge of the side region of the first lead portion 210 being received in the second receiving groove 324a.

[0139] The second protector body 322 can be configured in various ways to surround the edge of the side region of the first lead portion 210, and this disclosure is not limited or constrained by the structure and shape of the second protector body 322.

[0140] For example, the second protector body 322 may be configured to have a generally "C" shape that can surround the edge of the side region of the first lead portion 210. According to another embodiment of the present disclosure, the second protector body may be formed in a circular shape or other shapes.

[0141] The second protector protrusion 324 is disposed on the inner surface of the second protector body 322 to define a second receiving groove 324a, and the edge of the side region of the first lead portion 210 is received in the second receiving groove 324a.

[0142] The second protector protrusion 324 can be configured in various ways to define the second receiving groove 324a, and this disclosure is not limited or constrained by the structure of the second protector protrusion 324.

[0143] For example, the second protector protrusion 324 may be continuously formed along the inner surface of the second protector body 322, and the second protector protrusion 324 and the second protector body 322 may together form a second receiving groove 324a in a generally "U" shape.

[0144] In the embodiments described and illustrated above in this disclosure, the following example is described: in this example, the second protector protrusion 324 is continuously formed along the inner surface of the second protector body 322; however, according to another embodiment of this disclosure, a plurality of second protector protrusions may be spaced apart at predetermined intervals along the inner surface of the second protector body.

[0145] According to a preferred embodiment of the present disclosure, a second gap 324b may be defined between the other surface of the first lead portion 210 facing the bag-shaped member 130 and the bag-shaped member 130 via the second protector member 320.

[0146] Here, the second gap 324b can be understood as the gap between the other surface of the first lead portion 210 and the pouch 130 defined by the thickness of the second protector protrusion 324.

[0147] In this way, by defining a second gap 324b (space) between the other surface of the first lead portion 210 and the bag-shaped member 130 via the second protector member 320, the embodiments of the present disclosure can achieve the following beneficial effects: minimizing mutual interference (contact) between the first lead portion 210 and the bag-shaped member 130, and minimizing deformation and damage to the bag-shaped member 130 caused by interference between the first lead portion 210 and the bag-shaped member 130.

[0148] According to a preferred embodiment of this disclosure, the protector 300 may be configured to be selectively detachable from the first lead portion 210.

[0149] For example, the first protector member 310 can be selectively and detachably connected to the first lead portion 210 by allowing the edge of the first lead portion 210 to be received in the first receiving groove 314a, and the second protector member 320 can be selectively and detachably connected to the first lead portion 210 by allowing the edge of the first lead portion 210 to be received in the second receiving groove 324a.

[0150] According to another preferred embodiment of this disclosure, the protector 300 can be formed as an integral body with the first lead portion 210 by double injection molding.

[0151] For example, conventional insertion methods can be used as a method for forming the protector 300. For example, the first lead portion 210 can be prefabricated, and then the first lead portion 210 can be placed inside a mold (die), and the first lead portion 210 and the protector 300 can be integrally formed by injecting molten material (e.g., resin) into the mold and allowing the molten material to solidify in the mold.

[0152] In this way, by integrally forming the protector 300 with the first lead portion 210 using dual injection molding, the separate assembly process of assembling the protector 300 to the first lead portion 210 can be eliminated, thereby achieving the beneficial effect of simplifying the manufacturing process of the electrode lead assembly 20.

[0153] In the embodiments described and illustrated above in this disclosure, the following example is described: in this example, the protector 300 is detachably coupled to the first lead portion 210 or the protector 300 and the first lead portion 210 are integrally formed by double injection molding; however, according to another embodiment of this disclosure, the protector may be coupled (bonded) to the first lead portion using adhesive tape or a separate fastening member (e.g., a hook).

[0154] The protector 300 can be made of various materials having electrical insulation, and this disclosure is not limited or constrained by the material or characteristics of the protector 300.

[0155] For example, the protector 300 (first protector component and second protector component) can be made of conventional synthetic resin material with electrical insulation.

[0156] According to a preferred embodiment of this disclosure, the corner portion of the protector 300 may be rounded (or chamfered).

[0157] In this way, by rounding (or chamfering) the corners of the protector 300, the embodiments of this disclosure can achieve the following beneficial effects: more effectively suppressing damage to the bag-shaped member 130 caused by contact between the protector 300 and the bag-shaped member 130.

[0158] In the following text, reference will be made to Figures 4 to 7 The assembly process of the electrode lead assembly 20 and the electrode tab 120 according to embodiments of the present disclosure is described.

[0159] First, such as Figure 4 and Figure 5 As shown, an electrode lead assembly 20 including electrode leads 200 and protectors 300 is prepared. More specifically, the electrode leads 200 may be configured to include a first lead portion 210 and a second lead portion 220, and the first protector member 310 and the second protector member 320 may be configured to surround the edge of the first lead portion 210.

[0160] Next, as Figure 6 As shown, the electrode contact 120 is bent in a direction perpendicular to the length direction (total length direction) of the electrode assembly 110, so that the electrode contact 120 is in close contact with the end of the electrode assembly 110.

[0161] Next, as Figure 7 As shown, the electrode lead assembly 20 is positioned adjacent to the electrode assembly 110, such that the first lead portion 210 is in close contact with the outer surface of the bent electrode tab 120, and in this state, as Figure 8As shown, the end of the electrode tab 120 is bent, and then the first lead portion 210 and the electrode tab 120 are soldered together to complete the assembly of the electrode lead assembly 20 and the electrode assembly 110.

[0162] Furthermore, in the embodiments described and illustrated above in this disclosure, the following example is described: In this example, the connecting lead portion 230 that continuously connects the first lead portion 210 and the second lead portion 220 includes a first connecting lead portion 230a and a second connecting lead portion 230b, and the first connecting lead portion 230a and the second connecting lead portion 230b are bent in opposite directions. However, according to another embodiment of this disclosure, such as... Figure 10 and Figure 11 As shown, the first lead portion 210 and the second lead portion 220 can also be configured to be connected via a single connecting lead portion 230, and the connecting lead portion 230 is bent in a single direction.

[0163] In addition, such as Figure 10 and Figure 11 As shown, according to another embodiment of this disclosure, the first guide groove 240 can be excluded from the first lead portion 210, and the second guide groove 250 can be excluded from the connecting lead portion 230.

[0164] Alternatively, such as Figure 12 and Figure 13 As shown, according to another embodiment of the present disclosure, the connecting lead portion 230 that continuously connects the first lead portion 210 and the second lead portion 220 includes a first connecting lead portion 230a and a second connecting lead portion 230b, and the first connecting lead portion 230a and the second connecting lead portion 230b are configured to be bent in opposite directions, wherein the second guide groove 250 can be discharged from the connecting lead portion 230, and the first guide groove 240 can be formed only in the first lead portion 210.

[0165] According to a preferred embodiment of the present disclosure, the secondary battery 10 may include an insulating member 400 disposed between the pouch-shaped member 130 and the second lead portion 220.

[0166] The insulating member 400 is configured to suppress electrical conduction between the second lead portion 220 and the bag 130 while maintaining the sealing performance of the bag 130.

[0167] The insulating member 400 may be formed of a conventional non-conductive insulator (such as an insulating tape) that is non-conductive, and this disclosure is not limited or constrained by the material or properties of the insulating member 400.

[0168] Although this disclosure has been described above with respect to embodiments, these are merely examples and do not limit the scope of the disclosure, and those skilled in the art will understand that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments can be modified and implemented. Furthermore, differences associated with such modifications and applications should be interpreted as being included within the scope of the disclosure as defined in the appended claims.

[0169] [List of reference numerals]

[0170] 10: Secondary batteries

[0171] 20: Electrode lead assembly

[0172] 110: Electrode assembly

[0173] 120: Electrode contacts

[0174] 130: Bag-shaped item

[0175] 200: Electrode lead

[0176] 210: First lead section

[0177] 220: Second lead section

[0178] 230: Connecting lead section

[0179] 230a: First connecting lead section

[0180] 230b: Second connecting lead section

[0181] 240: First guide slot

[0182] 250: Second guide slot

[0183] 300: Protector

[0184] 310: First Protector Component

[0185] 312: First Protector Body

[0186] 314: First Protector Protrusion

[0187] 314a: First receiving groove

[0188] 314b: First gap

[0189] 320: Second Protector Component

[0190] 322: Second Protector Body

[0191] 324: Second protector protrusion

[0192] 324a: Second receiving groove

[0193] 324b: Second gap

[0194] 400: Insulating components

Claims

1. A secondary battery, comprising: Electrode assembly; An electrode contact, which is electrically connected to the electrode assembly and bent to make close contact with the end of the electrode assembly; A pouch-like component, the pouch-like component being configured to surround the periphery of the electrode assembly; An electrode lead, comprising a first lead portion and a second lead portion, the first lead portion being electrically connected to the electrode tab and housed inside the pouch-like member for stacking on the electrode tab, the second lead portion having one end connected to the first lead portion and another end exposed to the outside of the pouch-like member; and A protector is configured to surround the edge of the first lead portion.

2. The secondary battery according to claim 1, in, The protector includes a first protector component, which is configured to surround the edge of the central region of the first lead portion.

3. The secondary battery according to claim 2, in, The first protector component includes: A first protector body, the first protector body being configured to cover a surface of the first lead portion facing the electrode tab; and A first protector protrusion is disposed at the end of the first protector body and defines a first receiving groove, wherein the edge of the central region of the first lead portion is received in the first receiving groove.

4. The secondary battery according to claim 2, in, A first gap is defined between the electrode assembly and a surface of the first lead portion facing the electrode tab via the first protector member.

5. The secondary battery according to claim 1, in, The protector includes a second protector component, which is configured to surround the edge of the side region of the first lead portion.

6. The secondary battery according to claim 5, in, The second protector component includes: A second protector body is formed along the edge of the side region of the first lead portion; and A second protector protrusion is disposed on the second protector body and defines a second receiving groove, wherein the edge of the side region of the first lead portion is received in the second receiving groove.

7. The secondary battery according to claim 5, in, A second gap is defined between the other surface of the first lead portion facing the bag-shaped member and the bag-shaped member via the second protector member.

8. The secondary battery according to claim 1, in, The second lead portion is configured to be perpendicular to the first lead portion.

9. The secondary battery according to claim 1, in, The first lead portion and the second lead portion are integrally connected by soldering.

10. The secondary battery according to claim 1, comprising: A connecting lead portion, which is bent relative to the first lead portion and the second lead portion and continuously connects the first lead portion and the second lead portion.

11. The secondary battery according to claim 10, comprising at least one of the following: A first guide groove is formed in the first lead portion to allow the electrode tab to be exposed; and A second guide groove is formed in the connection lead portion to allow the electrode tabs to be exposed.

12. The secondary battery according to claim 1, in, The protector is configured to be selectively detachable from the first lead portion.

13. The secondary battery according to claim 1, in, The protector is formed into an integral body with the first lead portion through double injection molding.

14. An electrode lead assembly for a secondary battery, the secondary battery comprising: Electrode assembly; An electrode contact, which is electrically connected to the electrode assembly and bent to make close contact with the end of the electrode assembly; and a pouch-like component configured to surround the periphery of the electrode assembly, the electrode lead assembly comprising: An electrode lead, comprising a first lead portion and a second lead portion, the first lead portion being electrically connected to the electrode tab and housed inside the pouch-like member for stacking on the electrode tab, the second lead portion having one end connected to the first lead portion and another end exposed to the outside of the pouch-like member; and A protector is configured to surround the edge of the first lead portion.

15. The electrode lead assembly according to claim 14, in, The protector includes at least one of the following: A first protector component, the first protector component being configured to surround the edge of the central region of the first lead portion, and A second protector component is configured to surround the edge of the side region of the first lead portion.

16. The electrode lead assembly according to claim 15, in, The first protector component includes: A first protector body, the first protector body being configured to cover a surface of the first lead portion facing the electrode tab; and A first protector protrusion is disposed at the end of the first protector body and defines a first receiving groove, wherein the edge of the central region of the first lead portion is received in the first receiving groove.

17. The electrode lead assembly according to claim 15, in, The second protector component includes: A second protector body is formed along the edge of the side region of the first lead portion; and A second protector protrusion is disposed on the second protector body and defines a second receiving groove, wherein the edge of the side region of the first lead portion is received in the second receiving groove.

18. The electrode lead assembly according to claim 15, in, A first gap is defined between the first protector member and a surface of the first lead portion facing the electrode patch and the electrode assembly, and A second gap is defined between the other surface of the first lead portion facing the bag-shaped member and the bag-shaped member via the second protector member.

19. The electrode lead assembly according to claim 14, comprising: A connecting lead portion, which is bent relative to the first lead portion and the second lead portion and continuously connects the first lead portion and the second lead portion.

20. The electrode lead assembly of claim 19, comprising at least one of the following: A first guide groove is formed in the first lead portion to allow the electrode tab to be exposed; and A second guide groove is formed in the connection lead portion to allow the electrode tabs to be exposed.

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