Secondary battery, method of manufacturing secondary battery, and battery pack

Abstract

This document provides a secondary battery, a method for manufacturing a secondary battery, and a battery pack including the secondary battery. The secondary battery includes: a housing having an internal space; a cover assembly including a cover for closing the housing and terminals supported by the cover; a current collector located in the internal space and electrically connected to the terminals; an electrode assembly housed in the internal space; and a plurality of electrode tabs protruding from the electrode assembly, each of the plurality of electrode tabs including: a root portion connected to the electrode assembly; a weld portion welded to the current collector and offset to one side relative to the position of the root portion; and a middle portion connecting the root portion and the weld portion, and having a peak offset to the opposite side of the first side.

Description

Cross-reference to related applications

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0190082, filed on December 18, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] Embodiments of this disclosure relate to a secondary battery, a method of manufacturing a secondary battery, and a battery pack. Background Technology

[0003] With the recent and rapid proliferation of electronic devices using rechargeable batteries (such as mobile phones, laptops, electric vehicles, etc.), the market for rechargeable batteries with high energy density and high capacity has been growing. Accordingly, research and development to improve the performance of lithium rechargeable batteries is actively underway.

[0004] A lithium-ion secondary battery is a battery that includes a positive electrode, a negative electrode, and an electrolyte. Each electrode contains active materials capable of inserting and deintercalating lithium ions. The secondary battery generates electrical energy through oxidation and reduction reactions as lithium ions are inserted into and deintercalated from the positive and negative electrodes.

[0005] The information disclosed in this background section is intended to enhance the understanding of the background of this disclosure and may contain information that does not constitute prior art. Summary of the Invention

[0006] One or more embodiments of this disclosure are intended to provide a secondary battery, a method of manufacturing a secondary battery, and a battery pack, wherein a plurality of electrode terminals of an electrode assembly can be soldered to a current collector.

[0007] The above and other aspects and features of this disclosure will be described in, or will be apparent from, the following description of some embodiments of this disclosure.

[0008] According to one or more embodiments of this disclosure, a secondary battery includes: a housing having an internal space; a cover assembly including a cover for closing the housing and terminals supported by the cover; a current collector located in the internal space and electrically connected to the terminals; an electrode assembly housed in the internal space; and a plurality of electrode tabs protruding from the electrode assembly, each of the plurality of electrode tabs including: a root portion connected to the electrode assembly; a weld portion welded to the current collector and offset to one side relative to the position of the root portion; and an intermediate portion connecting the root portion and the weld portion and having a peak offset to the opposite side of the offset.

[0009] In one or more embodiments, the plurality of electrode tabs may overlap in the thickness direction of the electrode assembly.

[0010] In one or more embodiments, for at least one of the plurality of electrode tabs, the welded portion may be offset to one side relative to the position of the root portion in the width direction of the current collector, and the peak point may be offset to the opposite side of the one side relative to the position of the root portion in the width direction of the current collector.

[0011] In one or more embodiments, the current collector may include a plurality of weld line portions formed by welding (e.g., being welded) to the weld portions of the electrode tabs, and extending in the width direction of the current collector and spaced apart and / or separated (e.g., spaced apart or separated) in the longitudinal direction of the current collector.

[0012] In one or more embodiments, for at least one of the plurality of electrode tabs, the welded portion may be located between the electrode assembly and the current collector, and may be welded to the side of the current collector facing the electrode assembly (e.g., opposite to the electrode assembly).

[0013] In one or more embodiments, the current collector may include: a flat portion to which the welded portion of the electrode tab is welded; and a reinforcing rib portion that bends and protrudes from an end of the flat portion in the width direction and extends parallel to the longitudinal direction of the flat portion.

[0014] In one or more embodiments, the secondary battery may further include a current collector connecting the terminal and the current collector plate.

[0015] In one or more embodiments, the current collector can be welded to the current collector plate.

[0016] In one or more embodiments, the electrode assembly may include: a first electrode; a second electrode, separate from the first electrode; and a diaphragm disposed between the first electrode and the second electrode.

[0017] In one or more embodiments, the electrode terminals may include a first electrode terminal connected to the first electrode and a second electrode terminal connected to the second electrode, the current collector may include a first current collector soldered to the first electrode terminal and a second current collector soldered to the second electrode terminal, the terminal may include a first terminal and a second terminal spaced apart from and / or separated from the first terminal (e.g., spaced apart or separated), and the current collector may include a first current collector connecting the first terminal and the first current collector and a second current collector connecting the second terminal and the second current collector.

[0018] In one or more embodiments, the first electrode and the first electrode terminal block may be provided as a one-to-one correspondence of a plurality of first electrodes (e.g., each of the plurality of first electrodes may correspond to a corresponding one of the plurality of first electrode terminal blocks), and the second electrode and the second electrode terminal block may be provided as a one-to-one correspondence of a plurality of second electrodes (e.g., each of the plurality of second electrodes may correspond to a corresponding one of the plurality of second electrode terminal blocks).

[0019] In one or more embodiments, the housing may include a first sidewall and a second sidewall facing each other (e.g., opposite), the first current collector may be located in the interior space between the electrode assembly and the first sidewall, and the second current collector may be located in the interior space between the electrode assembly and the second sidewall.

[0020] According to one or more embodiments of this disclosure, a method of manufacturing a secondary battery includes: supplying an electrode assembly and electrode tabs to an electrode assembly having a plurality of electrode tabs protruding from the electrode assembly; bending the plurality of electrode tabs such that the plurality of electrode tabs are in a (substantially) same direction relative to the electrode assembly; biasing a current collector relative to the electrode assembly in the same direction of bending of the plurality of electrode tabs such that the current collector contacts the plurality of electrode tabs; welding the current collector and the plurality of electrode tabs; and moving the current collector to a position where it is not biased relative to the electrode assembly.

[0021] In one or more embodiments, the electrode tab may include a root portion connected to the electrode assembly, a weld portion welded to the current collector during the electrode tab welding operation, and an intermediate portion connecting the root portion and the weld portion, wherein moving the current collector may offset the position of the weld portion relative to the root portion to one side, and a peak offset to the opposite side may be formed in the intermediate portion.

[0022] In one or more embodiments, by moving the manifold, the welded portion may be offset to one side relative to the position of the root portion in the width direction of the manifold, and the peak point may be offset to the opposite side of the one side relative to the position of the root portion in the width direction of the manifold.

[0023] In one or more embodiments, the method of manufacturing a secondary battery may further include a current collector and electrode terminal insertion operation, in which the electrode assembly, along with the welded current collector and electrode terminal, are inserted into a housing.

[0024] In one or more embodiments, prior to inserting the electrode assembly, the method of manufacturing a secondary battery may further include: a cover assembly and current collector connection operation of connecting a current collector to a terminal of a cover assembly, the cover assembly including a cover plate and the terminal supported by the cover plate; and a current collector and current collector connection operation of connecting the current collector to the current collector plate.

[0025] In one or more embodiments, connecting the current collector to the current collector plate may include welding the current collector plate and the current collector.

[0026] In one or more embodiments, the method of manufacturing a secondary battery may further include: attaching the cover plate to the housing such that the cover plate seals the housing.

[0027] According to one or more embodiments of the present disclosure, a battery pack is provided, the battery pack comprising: a housing; and a plurality of secondary batteries disposed inside the housing, wherein each of the plurality of secondary batteries comprises: a housing having an internal space; a cover assembly including a cover for closing the housing and terminals supported by the cover; a current collector located in the internal space and electrically connected to the terminals; an electrode assembly housed in the internal space; and a plurality of electrode tabs protruding from the electrode assembly, each of the plurality of electrode tabs comprising: a root portion connected to the electrode assembly; a weld portion welded to the current collector and offset to one side relative to the position of the root portion; and an intermediate portion connecting the root portion and the weld portion and having a peak offset to the opposite side of the offset. Attached Figure Description

[0028] The accompanying drawings are included to provide a further understanding of this disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0029] Figure 1This is a perspective view schematically illustrating a battery pack according to one or more embodiments of the present disclosure;

[0030] Figure 2 This is a perspective view schematically illustrating a secondary battery according to one or more embodiments of the present disclosure;

[0031] Figure 3 This is an exploded perspective view schematically illustrating a secondary battery according to one or more embodiments of the present disclosure;

[0032] Figure 4 It is according to one or more embodiments of this disclosure along Figure 2 A cross-sectional view taken from line S1-S1;

[0033] Figure 5 This is an exploded perspective view schematically illustrating an electrode assembly according to one or more embodiments of the present disclosure;

[0034] Figure 6 This is an example of one or more embodiments according to this disclosure. Figure 4 The side view of the interior of the shell, taken by line S2-S2;

[0035] Figure 7 This is an example of one or more embodiments according to this disclosure. Figure 4 The side view of the interior of the shell, taken by line S3-S3;

[0036] Figure 8 This illustrates one or more embodiments according to the present disclosure. Figure 4 Enlarged perspective view of the first and second collectors;

[0037] Figure 9 This is an example of one or more embodiments according to this disclosure. Figure 4 A cross-sectional view of the electrode assembly, the first current collector, and multiple first electrode terminals taken from line S4-S4;

[0038] Figure 10 This illustrates one or more embodiments according to the present disclosure. Figure 9 A cross-sectional view of the first current collector and the multiple first electrode terminals in a bent state before they are welded together;

[0039] Figure 11 This illustrates one or more embodiments according to the present disclosure. Figure 9 A cross-sectional view of the first current collector being positioned relative to the electrode assembly during the welding of the first current collector and multiple first electrode terminals;

[0040] Figure 12 This is an example of one or more embodiments according to this disclosure. Figure 4 A cross-sectional view of the electrode assembly, the second current collector, and multiple second electrode terminals taken from line S5-S5;

[0041] Figure 13 This illustrates one or more embodiments according to the present disclosure. Figure 12 A cross-sectional view of the second current collector and the multiple second electrode terminals before they are welded together, showing the multiple second electrode terminals bent.

[0042] Figure 14 This illustrates one or more embodiments according to the present disclosure. Figure 12 A cross-sectional view of the second current collector being positioned relative to the electrode assembly during the welding of the second current collector and multiple second electrode terminals. Detailed Implementation

[0043] This disclosure can be modified in many alternative forms, and therefore specific embodiments will be illustrated in the accompanying drawings and described in more detail. However, it should be understood that this is not intended to limit this disclosure to the specific forms disclosed, but rather to cover all modifications, equivalents, and alternatives that fall within the spirit and scope of this disclosure.

[0044] In the following description, exemplary embodiments will be presented in more detail with reference to the accompanying drawings. However, this disclosure may be implemented in a variety of different forms and should not be construed as limited to the embodiments illustrated herein. Rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the aspects and features of this disclosure to those skilled in the art. Accordingly, processes, elements, and techniques unnecessary for those skilled in the art to fully understand the aspects and features of this disclosure may not be described.

[0045] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms such as those defined in common dictionaries shall be interpreted as having the same meaning as they have in the context of the relevant technology and / or this specification, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0046] It will be understood that when an element (such as a region, layer, membrane, area, or portion) is referred to as being "on" another element, "connected to," or "attached to" another element, it can be directly on, directly connected to, or directly attached to the other element, or one or more intervening elements may be present. In contrast, when an element or layer is referred to as being "directly on" another element or layer, "directly connected to," "directly attached to," or "immediately adjacent to" another element or layer, no intervening element or layer is present. Furthermore, it will be understood that when an element is referred to as being "between" two elements, it can be the only element between the two elements, or one or more intervening elements may be present.

[0047] In the accompanying drawings, for clarity, the relative dimensions (e.g., including length, width, and thickness) of elements, layers, and regions may be exaggerated. The dimensions of various elements, layers, etc., may be exaggerated in the accompanying drawings for clarity of illustration. Unless otherwise stated, the same reference numerals denote the same elements throughout the accompanying drawings and written description, and therefore their repeated description is not required.

[0048] As used herein, the term “and / or” includes any one and all combinations of one or more of the related listed items. Furthermore, the use of “may” in describing embodiments of this disclosure refers to “one or more embodiments of this disclosure.” Unless otherwise apparent from this disclosure, expressions such as “at least one of…”, “a plurality of…”, “one of…”, and other prepositional phrases, when written as a list of conjunctions before / after the list of elements, should be understood to include extractive terms, and vice versa. For example, expressions “at least one of a, b, and c”, “one selected from the group consisting of a, b, and c”, “at least one selected from a, b, and c”, “at least one of a, b, and c”, “one of a, b, and c”, “at least one of a to c” indicate only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0049] As used in this article, the term “use” can be considered synonymous with the term “utilize”.

[0050] As used herein, the terms “substantially,” “approximately,” and similar terms are used as approximate terms, not as terms of degree, and are intended to take into account the inherent biases of measured or calculated values ​​that would be recognized by a person skilled in the art. “Substantially” as used herein includes the value and means within an acceptable range of deviation for a particular value as determined by a person skilled in the art considering the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, “substantially” may mean within one or more standard deviations, or within ±30%, 20%, 10%, or 5% of the value. Furthermore, it should be understood that even if the terms “approximately,” “approximately,” or “substantially” are not explicitly stated in a given claim element, the scope of that claim element is intended to include non-substantial variations or variations that would be understood by a person skilled in the art. For example, the numerical values ​​and ranges provided herein are intended to include tolerances and measurement uncertainties that would be recognized by a person skilled in the art, and the claims should be interpreted accordingly to cover these equivalents.

[0051] It should be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, areas, layers, and / or segments, these elements, components, areas, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, area, layer, or segment from another. Therefore, without departing from the spirit and scope of this disclosure, the first element, component, area, layer, or segment discussed below may be referred to as the second element, component, area, layer, or segment.

[0052] For ease of explanation, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein to describe the relationship between one element or feature and another element or feature as shown in the figure. It should be understood that spatial relative terms are intended to cover different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “under” other elements or features would then be oriented as “above” or “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein should be interpreted accordingly.

[0053] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure. As used herein, the singular forms “a” and “said” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprising,” “including,” and “having” as used in this specification specify the presence of the stated feature, integer, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Additionally, the terms “comprising,” “including,” “having,” or similar terms include or support the terms “consisting of” and “substantially consisting of”, indicating the presence of the stated feature, integer, step, operation, element, and / or component, while other features, integers, steps, operations, elements, components, and / or groups thereof are absent or substantially absent.

[0054] Furthermore, any numerical range disclosed and / or described herein is intended to include all subranges with the same numerical precision contained within the described range. For example, the range “1.0 to 10.0” is intended to include all subranges between (and including) the described minimum value of 1.0 and the described maximum value of 10.0, i.e., a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit described herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit described herein is intended to include all higher numerical limits contained therein. Accordingly, the applicant reserves the right to amend this specification, including the claims, to explicitly describe any subranges contained within the scope explicitly described herein.

[0055] Referring to two compared elements, features, etc., as “identical” can mean that they are “substantially identical.” The phrase “substantially identical” can include cases where the deviation is considered low in the art (e.g., less than 5%). Additionally, when a parameter is said to be consistent in a given region, it can mean that it is consistent in terms of average value.

[0056] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0057] When an element is referred to as being arranged (or located or positioned) "above (or below)" or "on (or below)" a component, it may mean that the element is placed in contact with the upper (or lower) surface of the component, and may also mean that another component may be located between the component and any element arranged (or located or positioned) on (or below) the component.

[0058] Furthermore, it should be understood that when a component is referred to as "connected," "linked," or "attached" to another component, these components may be directly "connected," "linked," or "attached" to each other, or one or more intermediary components may exist between them, through which the component may be "connected," "linked," or "attached" to the other component. Additionally, when a part is referred to as "electrically connected" to another part, the part may be directly electrically connected to the other part, or one or more intermediary components may exist between them, such that the part and the other part are indirectly electrically connected to each other.

[0059] Throughout this specification, unless otherwise stated, the phrase "A and / or B" refers to A, B, or A and B. For example, "and / or" includes any one or all combinations of the listed items. Unless otherwise stated, the phrase "C~D" refers to C and below D.

[0060] The terminology used in this specification is for describing embodiments of this disclosure and is not intended to limit this disclosure.

[0061] Figure 1 This is a perspective view that schematically illustrates the configuration of a battery pack according to one or more embodiments of the present disclosure.

[0062] refer to Figure 1 According to one or more embodiments, the battery pack 1 may include a housing 10, a secondary battery 2, and a busbar 3.

[0063] The housing 10 can form the general shape of the battery pack 1 and can provide space to accommodate the secondary battery 2.

[0064] According to one or more embodiments, the housing 10 may include a housing body 11 and a cover 12.

[0065] The outer casing 11 can be formed in the shape of a box, having an empty interior and an open side. The cross-sectional shape of the outer casing 11 is not limited to... Figure 1 The quadrilateral shape is illustrated in the figure, and can be designed as any shape having one or more suitable shapes such as polygonal shapes, circular shapes, elliptical shapes or other shapes.

[0066] The cover 12 can be attached to the housing body 11 and can close the interior space of the housing body 11. For example, the cover 12 can be formed to have a substantially plate-like shape (e.g., a substantially flat shape with a thickness substantially less than the other two dimensions) and can be arranged to face the open side of the housing body 11. The cover 12 can be secured to the housing body 11 by any of one or more suitable types (kinds) of connection methods such as bolting, welding, mating, etc.

[0067] The secondary battery 2 can be used as a unit structure for storing and supplying power in the battery pack 1. The secondary battery 2 can be arranged in the housing 10.

[0068] Multiple secondary batteries 2 can be provided. The multiple secondary batteries 2 can be arranged in the longitudinal direction of the housing 10 (based on...). Figure 1 (in the X-axis direction) and / or the width direction (based on) Figure 1 Arranged in two or more rows on at least one of the Y-axis directions. Figure 1 For example, multiple secondary batteries 2 are arranged in six rows along the longitudinal direction of the housing 10, but the arrangement of the multiple secondary batteries 2 is not limited to this, and can be designed to have one or more suitable arrangements. The multiple secondary batteries 2 can be arranged in parallel. The number of secondary batteries 2 can be designed in one or more suitable ways depending on the size, shape, etc. of the housing 10.

[0069] Multiple secondary batteries 2 can be electrically connected via busbar 3.

[0070] According to one or more embodiments, a busbar 3 can be arranged between the cover 12 and the secondary battery 2. Multiple busbars 3 can be provided. Each busbar 3 can be connected in series or in parallel to a pair of adjacent secondary batteries 2.

[0071] For example, the first terminal 420 of one of a pair of adjacent secondary batteries 2 (see example) Figure 2 ) and the first terminal 420 of another adjacent secondary battery 2 (see example) Figure 2 The secondary batteries 2 can be arranged to face each other in the longitudinal direction of the housing 10. For example, the front wall 120 of one of the adjacent secondary batteries 2 (see example) Figure 3 ) can be arranged to face the rear wall 130 of another secondary battery 2 (see example) Figure 6 ).

[0072] Busbar 3 can be connected to the first terminal 420 of a pair of adjacent secondary batteries 2, and another busbar 3 can be connected to the second terminal 430 of one of the secondary batteries 2 in the pair and the second terminal 430 of the other secondary battery 2 that is also adjacent to that one secondary battery 2 in the pair. Accordingly, multiple secondary batteries 2 can be connected in series with each other through busbar 3.

[0073] However, the busbar 3 is not limited to this connection form, and can also be connected to each of the first terminal 420 of one of a pair of adjacent secondary batteries 2 and the first terminal 430 of the other secondary battery 2, or to each of the second terminal 430 of one of a pair of adjacent secondary batteries 2 and the second terminal 430 of the other secondary battery 2.

[0074] Busbar 3 can be formed of conductive materials such as copper, aluminum, or nickel. The specific shape of busbar 3 is not limited to... Figure 1 The shape shown in the figure can be designed to have one or more suitable shapes that are capable of electrically connecting adjacent secondary batteries 2.

[0075] Multiple busbars 3 can be supported in the housing 10 by busbar brackets H.

[0076] According to one or more embodiments, the busbar bracket H can be formed in a flat plate shape. The busbar bracket H can be arranged between the cover 12 and the secondary battery 2. The busbar 3 can be fixed to the busbar bracket H by one or more suitable types of connection methods such as mating, bolting, injection bonding, etc. The busbar bracket H can be configured to include an electrically insulating polymer composite material.

[0077] In the following, a secondary battery 2 according to one or more embodiments of the present disclosure will be described.

[0078] Figure 2 This is a perspective view schematically illustrating the configuration of a secondary battery according to one or more embodiments of the present disclosure. Figure 3 This is an exploded perspective view schematically illustrating the configuration of a secondary battery according to one or more embodiments of the present disclosure. Figure 4 It is according to one or more embodiments of this disclosure along Figure 2 The cross-sectional view taken from line S1-S1. Figure 5 This is an exploded perspective view schematically illustrating the configuration of an electrode assembly according to one or more embodiments of the present disclosure. Figure 6 This is an example of one or more embodiments according to this disclosure. Figure 4 The side view of the interior of the shell is taken by line S2-S2. Figure 7 This is an example of one or more embodiments according to this disclosure. Figure 4 The side view of the interior of the housing is taken by line S3-S3. Figure 8 This illustrates one or more embodiments according to the present disclosure. Figure 4 Enlarged perspective view of the first and second collectors. Figure 9 This illustrates a section cut along line S4-S4 according to one or more embodiments of the present disclosure. Figure 4 A cross-sectional view of the electrode assembly, the first current collector, and multiple first electrode terminals. Figure 10 This illustrates one or more embodiments according to the present disclosure. Figure 9 A cross-sectional view of the first current collector and the multiple first electrode terminals in a bent state before they are welded together. Figure 11 This illustrates one or more embodiments according to the present disclosure. Figure 9A cross-sectional view of the first current collector being positioned relative to the electrode assembly during the welding of the first current collector and multiple first electrode terminals. Figure 12 This is an example of a section cut along line S5-S5. Figure 4 Cross-sectional view of the electrode assembly, the second current collector, and multiple second electrode terminals. Figure 13 This illustrates one or more embodiments according to the present disclosure. Figure 12 A cross-sectional view of the bending state of the second current collector and multiple second electrode terminals before they are welded together. Figure 14 This illustrates one or more embodiments according to the present disclosure. Figure 12 A cross-sectional view of the second current collector being positioned relative to the electrode assembly during the welding of the second current collector and multiple second electrode terminals.

[0079] In the following description, an example of a prismatic lithium-ion secondary battery 2 will be presented. However, this disclosure is not limited thereto, and the secondary battery may be a lithium polymer battery or a cylindrical battery.

[0080] refer to Figures 2 to 8 The secondary battery 2 according to one or more embodiments includes a housing 100, an electrode assembly 200, a cover assembly 400, current collectors 600 and 700, and a plurality of electrode terminals 300 and 350.

[0081] The housing 100 can form the general shape of the secondary battery 2 and house the electrode assembly 200.

[0082] The housing 100 according to one or more embodiments may include a plurality of walls 110, 120, 130, 140 and 150 defining an internal space 101. The plurality of walls 110, 120, 130, 140 and 150 may include a bottom wall 110, a front wall 120, a rear wall 130, a first side wall 140 and a second side wall 150.

[0083] The bottom wall 110 can form the lower exterior of the housing 100 (see example). Figure 3 According to one or more embodiments, the bottom wall 110 may have a rectangular plate shape. The bottom wall 110 may be disposed on the bottom surface of the housing body 11.

[0084] The front wall 120, rear wall 130, first side wall 140 and second side wall 150 can form the periphery of the housing 100.

[0085] According to one or more embodiments, the front wall 120, rear wall 130, first side wall 140, and second side wall 150 may each have a plate shape extending upward from the edge of the bottom wall 110 (see example...). Figure 3The front wall 120, rear wall 130, first side wall 140, and second side wall 150 may be arranged around the space above the bottom wall 110 (e.g., around the space above the bottom wall 110). The front wall 120, rear wall 130, first side wall 140, and second side wall 150 may be arranged to form a rectangular cross-sectional shape.

[0086] The front wall 120 and the rear wall 130 may be arranged to face each other in the width direction (e.g., the X-axis direction) of the housing 100. The front wall 120 and the rear wall 130 may be arranged parallel to each other. The areas of the front wall 120 and the rear wall 130 may be the same.

[0087] The first sidewall 140 and the second sidewall 150 may be arranged to face each other in the longitudinal direction (e.g., the Y-axis direction) of the housing 100. The first sidewall 140 may be located on one side in the longitudinal direction of the housing 100, and the second sidewall 150 may be located on the other side in the longitudinal direction of the housing 200.

[0088] The first sidewall 140 and the second sidewall 150 may be arranged parallel to each other. The area of ​​the first sidewall 140 and the area of ​​the second sidewall 150 may be the same. The area of ​​the first sidewall 140 and the second sidewall 150 may be smaller than the area of ​​the front wall 120 and the rear wall 130.

[0089] The housing 100 may further include an opening 160. According to one or more embodiments, the opening 160 may refer to the space defined by the upper portion of the front wall 120, the upper portion of the rear wall 130, the upper portion of the first side wall 140, and the upper portion of the second side wall 150. The opening 160 may interconnect the internal space 101 and the external space of the housing 100.

[0090] Accordingly, the housing 100 according to one or more embodiments may have a cuboid shape with an open top.

[0091] The first direction, described in more detail below, can refer to being parallel to the direction based on Figures 2 to 4 The direction of the Y-axis. The second direction, described in more detail below, can refer to the direction parallel to the Y-axis. Figures 2 to 4 The direction of the X-axis. The third direction, described in more detail below, can refer to the direction parallel to the X-axis. Figures 2 to 4 The direction of the Z-axis.

[0092] The electrode assembly 200 can be used as a unit structure for performing charging and discharging operations of electricity in a secondary battery. The electrode assembly 200 can be housed within the internal space 101 of the housing 100.

[0093] An electrode assembly 200 according to one or more embodiments may include a first electrode 210, a second electrode 220 separate from the first electrode 210, and a diaphragm 230 disposed between the first electrode 210 and the second electrode 230. Multiple first electrodes 210, diaphragms 230, and second electrodes 220 may be provided.

[0094] In the following description, an example of an electrode assembly 200 having a stacked configuration in which a plurality of first electrodes 210, diaphragms 230, and second electrodes 220 are sequentially stacked in a second direction will be described. However, the form of the electrode assembly 200 is not limited to this, and it can also be formed in a configuration where the first electrodes 210, diaphragms 230, and second electrodes 220 are stacked and wound around a winding axis in a clockwise or counterclockwise direction.

[0095] The first electrode 210 can be used as either a positive or negative electrode of the electrode assembly 200. Hereinafter, the first electrode 210 will be described as a positive electrode of the electrode assembly 200. However, the first electrode 210 is not limited thereto, and when the second electrode 220 is a positive electrode, the first electrode 210 can also be used as a negative electrode of the electrode assembly 200.

[0096] The first electrode 210 according to one or more embodiments can be formed in a foil shape and comprise a metallic material such as aluminum or an aluminum alloy. The type, size, shape, etc., of the first electrode 210 are not particularly limited, as long as the first electrode 114 is conductive (e.g., a conductor) and does not cause chemical changes in the secondary battery. Except... Figure 5 In addition to the rectangular shape shown, the cross-sectional shape of the first electrode 210 can be designed to have one or more suitable shapes.

[0097] Multiple first electrodes 210 can be provided. The multiple first electrodes 210 can be arranged in a second direction between the front wall 120 and the rear wall 130 of the housing 100. The number of first electrodes 210 can be designed to vary depending on the charging capacity of the secondary battery 2, etc.

[0098] The first active material layer 211 may be applied to the first electrode 210. The first active material layer 211 may be applied to both surfaces (e.g., opposite surfaces) of the first electrode 210, or alternatively, may be applied to only one surface of the first battery 210.

[0099] When the first electrode 210 is used as a positive electrode, the first active material layer 211 may include a positive electrode active material.

[0100] The positive electrode active material can be a compound capable of reversibly inserting and extracting lithium (lithium insertion compound). For example, one or more of composite oxides of lithium and metals selected from cobalt, manganese, nickel, and combinations thereof (e.g., any suitable combination) can be used.

[0101] In one example, the positive electrode active material can include at least one of lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and / or lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM). Here, 0 < x < 1, 0 < y < 1, 0 < z < 1, and x + y + z = 1 can be satisfied. The positive electrode active material can include only one of lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM), and can include two or all of lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and / or lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM).

[0102] The first active material layer 211 can further include a positive electrode conductive material.

[0103] The positive electrode conductive material is used to impart conductivity to the first active material layer 211, and any material that does not cause chemical changes and is conductive can be used. Examples of the positive electrode conductive material can include: carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metal-based materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers such as polyphenylene derivatives; and / or mixtures thereof (e.g., any suitable combination).

[0104] The first active material layer 211 can further include a positive electrode binder.

[0105] The positive electrode binder is used to attach the particles constituting the positive electrode active material to each other well, and can also be used to attach the positive electrode active material well to the first electrode 210.

[0106] Examples of the positive electrode binder can include non-aqueous binders, aqueous binders, dry binders, and / or combinations thereof (e.g., any suitable combination).

[0107] Non-aqueous adhesives may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide and / or any suitable combination thereof.

[0108] Waterborne adhesives can be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof (e.g., any suitable combination).

[0109] When using an aqueous binder as the positive electrode binder, a cellulose compound may be further included to impart viscosity. This cellulose compound can be used by mixing one or more of carboxymethyl cellulose, hydroxypropyl methylcellulose, methylcellulose, and their alkali metal salts. Na, K, or Li can be used as the alkali metal.

[0110] Dry binders can be fibrous polymeric materials, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide and / or combinations thereof (e.g., any suitable combination).

[0111] The second electrode 220 can be used as another of the positive and negative electrodes of the electrode assembly 200. Hereinafter, the second electrode 220 will be described as the negative electrode of the electrode assembly 200. However, the second electrode 220 is not limited thereto, and when the first electrode 210 is the negative electrode, the second electrode 220 can also be used as the positive electrode of the electrode assembly 200.

[0112] Multiple second electrodes 220 may be provided. The multiple second electrodes 220 may be arranged in a second direction between the front wall 120 and the rear wall 130 of the housing 100. The first electrode 210 and the second electrode 220 may be arranged alternately in the second direction. The second electrode 220 may be spaced apart from and / or separated from the first electrode 210 in the second direction (e.g., spaced apart or separated).

[0113] The second electrode 220 according to one or more embodiments can be formed in a foil shape and comprise a metallic material such as copper, a copper alloy, nickel, or a nickel alloy. The type, size, shape, etc., of the second electrode 220 are not particularly limited, as long as the second electrode 210 is conductive (e.g., a conductor) and does not cause a chemical change in the secondary battery. Except... Figure 5Outside the rectangular shape shown, the cross-sectional shape of the second electrode 220 can be designed to have one or more suitable shapes.

[0114] The second active material layer 221 can be coated on the second electrode 220. The second active material layer 221 can be coated on both surfaces (e.g., opposite surfaces) of the second electrode 220, or alternatively, can be coated on only one surface of the second electrode 220.

[0115] When the second electrode 220 is used as the negative electrode, the second active material layer 221 can include a negative electrode active material.

[0116] The negative electrode active material includes a material capable of reversibly inserting / extracting lithium ions, lithium metal, an alloy of lithium and a metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0117] The material capable of reversibly inserting / extracting lithium ions can be a carbon-based negative electrode active material, such as crystalline carbon, amorphous carbon, and / or a combination thereof (e.g., any suitable combination). Examples of crystalline carbon can include graphite such as natural graphite or artificial graphite in the form of amorphous, plate-like, flaky, spherical, or fibrous, and examples of amorphous carbon can include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0118] An alloy of lithium and a metal selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn can be used as the alloy of lithium and a metal.

[0119] As the material capable of doping and dedoping lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material can be used. The Si-based negative electrode active material can include silicon, a silicon-carbon composite, SiO x (where 0 < x ≤ 2), a Si-Q alloy (where Q is selected from alkali metals, alkaline earth metals, group 13 elements, group 14 elements (excluding Si), group 15 elements, group 16 elements, transition metals, rare earth elements, and a combination thereof (e.g., any suitable combination)) and / or a combination thereof (e.g., any suitable combination). The Sn-based negative electrode active material can include Sn, SnO x (where 0 < x ≤ 2, e.g., SnO2), a Sn-based alloy, and / or a combination thereof (e.g., any suitable combination).

[0120] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to one or more embodiments, the silicon-carbon composite can be in the form of silicon particles whose surfaces are coated with amorphous carbon. For example, the silicon-carbon composite can include secondary particles (cores) in which primary silicon particles are aggregated, and an amorphous carbon coating (shell) on the surface of the secondary particles. The amorphous carbon can also be located between the primary silicon particles, such that, for example, the primary silicon particles can be coated with amorphous carbon. The secondary particles can be dispersed within an amorphous carbon matrix.

[0121] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles, and an amorphous carbon coating on the surface of the core.

[0122] Si-based or Sn-based negative electrode active materials can be used in combination with carbon-based negative electrode active materials.

[0123] The second active material layer 221 may further include a negative electrode conductive material and a negative electrode binder.

[0124] The negative electrode conductive material is used to impart conductivity to the second active material layer 221, and any material that does not cause chemical change and is conductive can be used. Examples of negative electrode conductive materials may include: carbon-based materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, carbon nanotubes, etc.; metal-based materials, including metal powders or metal fibers of copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; and / or mixtures thereof (e.g., any suitable mixtures).

[0125] The negative electrode binder is used to attach the particles constituting the negative electrode active material to each other in a good manner, and can also be used to attach the negative electrode active material to the second electrode 220 in a good manner.

[0126] Examples of negative electrode adhesives may include non-aqueous adhesives, aqueous adhesives, dry adhesives, and / or combinations thereof (e.g., any suitable combination).

[0127] Non-aqueous adhesives may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide and / or any suitable combination thereof.

[0128] Waterborne adhesives can be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof (e.g., any suitable combination).

[0129] When using an aqueous binder as the negative electrode binder, a cellulose compound may be further included to impart viscosity. This cellulose compound can be used by mixing one or more of carboxymethyl cellulose, hydroxypropyl methylcellulose, methylcellulose, and their alkali metal salts. Na, K, or Li can be used as the alkali metal.

[0130] Dry binders can be fibrous polymeric materials, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide and / or combinations thereof (e.g., any suitable combination).

[0131] A diaphragm 230 may be disposed between the first electrode 210 and the second electrode 220. The diaphragm 230 may perform the function of preventing or reducing the possibility of a short circuit between the first electrode 210 and the second electrode 220 while allowing lithium ions to move between the first electrode 210 and the second electrode 220.

[0132] The diaphragm 230 can be arranged to completely cover the surface area of ​​the electrode assembly 200. Accordingly, the diaphragm 230 can prevent or reduce the possibility that the first electrode 210 and the second electrode 220 are directly exposed to the outside of the electrode assembly 200.

[0133] As the separator 230, a multilayer membrane of polyethylene, polypropylene, polyvinylidene fluoride or two or more layers thereof can be used, and a mixed multilayer membrane such as a polyethylene / polypropylene two-layer separator, a polyethylene / polypropylene / polyethylene three-layer separator, a polypropylene / polyethylene / polypropylene three-layer separator, etc., can be used.

[0134] The diaphragm 230 may include a porous substrate and a coating on one or both surfaces (e.g., opposite surfaces) of the porous substrate, comprising organic materials, inorganic materials and / or combinations thereof (e.g., any suitable combination).

[0135] The porous substrate can be a polymer film formed from any polymer selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyetherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon), or copolymers or mixtures of two or more of them.

[0136] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0137] Inorganic materials may include inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and (e.g., any suitable) combinations thereof, but this disclosure is not limited thereto.

[0138] Organic and inorganic materials can exist as a mixture in a single coating, or they can exist as a stack of coatings containing organic materials and coatings containing inorganic materials.

[0139] The plurality of electrode terminals 300 and 350 may include a plurality of first electrode terminals 300 and a plurality of second electrode terminals 350. A first electrode terminal 300 may be connected to a first electrode 210. A plurality of first electrodes 210 and first electrode terminals 300 may be provided in a one-to-one correspondence.

[0140] Multiple first electrode tabs 300 can be arranged to overlap in the thickness direction of the electrode assembly 200. The thickness direction of the electrode assembly 200 is parallel to the thickness direction of the electrode assembly 200. Figure 5 and Figure 9 The direction of the X-axis can be the same as the second direction.

[0141] In this public disclosure and Figure 5 In one or more embodiments illustrated, a plurality of first electrode tabs 300 may be connected to a first electrode 210. In such embodiments, the plurality of first electrode tabs 300 may be arranged to be spaced apart and / or separated from each other in a third direction (e.g., a direction parallel to the Z-axis).

[0142] Since the first electrode 210 can be a positive electrode, the first electrode terminal 300 can be used as the positive electrode terminal of the secondary battery 2. However, the first electrode terminal 300 is not limited to this; if the first electrode 210 is a negative electrode (for example, when the first electrode 210 is a negative electrode), it can be used as the negative electrode terminal of the secondary battery 2.

[0143] based on Figure 5 The first electrode tab 300 may protrude from the electrode assembly 200 in a positive (+) direction parallel to the Y-axis. For example, the first electrode tab 300 may extend from the electrode assembly 200 toward the first sidewall 140 inside the housing 100.

[0144] The first electrode terminal 300 can be formed by slotting the uncoated portion of the first electrode 210 that is not coated with the first active material layer 211.

[0145] For example Figure 9 As shown, each first electrode tab 300 includes a root portion 310 connected to the electrode assembly 200, a welding portion 320 provided at an end of the first electrode tab 300 that is spaced apart from and / or separated from the electrode assembly 200 (e.g., spaced apart or separated), and an intermediate portion 330 connecting the root portion 310 and the welding portion 320. The root portion 310, the intermediate portion 330, and the welding portion 320 may be integrally formed.

[0146] For example Figure 5 As shown, the second electrode terminal 350 can be connected to the second electrode 220. Multiple second electrodes 220 and second electrode terminals 350 can be provided in a one-to-one correspondence.

[0147] Multiple second electrode tabs 350 can be arranged to overlap in the thickness direction of the electrode assembly 200. The thickness direction of the electrode assembly 200 is parallel to the thickness direction of the electrode assembly 200. Figure 5 and Figure 12 The direction of the X-axis can be the same as the second direction.

[0148] In this public disclosure and Figure 5 In one or more embodiments illustrated, different from those shown, a plurality of second electrode tabs 350 may be connected to a single second electrode 220. In such embodiments, the plurality of second electrode tabs 350 may be arranged to be spaced apart and / or separated from each other in a third direction (e.g., spaced apart or separated).

[0149] Since the second electrode 220 can be a negative electrode, the second electrode terminal 350 can be used as a negative electrode terminal of the secondary battery 2. However, the second electrode terminal 350 is not limited to this, and if the second electrode 220 is a positive electrode (for example, when the second electrode 220 is a positive electrode), it can be used as a positive electrode terminal of the secondary battery 2.

[0150] based on Figure 5 The second electrode tab 350 may protrude from the electrode assembly 200 in a negative (-) direction parallel to the Y-axis. For example, the second electrode tab 350 may extend from the electrode assembly 200 toward the second sidewall 150 inside the housing 100.

[0151] The second electrode terminal 350 can be formed by slotting the uncoated portion of the second electrode 220 that is not coated with the second active material layer 221.

[0152] For example Figure 12 As shown, each second electrode tab 350 includes a root portion 360 connected to the electrode assembly 200, a welding portion 370 provided at an end of the second electrode tab 350 that is spaced apart from and / or separated from the electrode assembly 200 (e.g., spaced apart or separated), and an intermediate portion 380 connecting the root portion 360 and the welding portion 370. The root portion 360, the intermediate portion 380, and the welding portion 370 may be integrally formed.

[0153] The cover assembly 400 includes a cover plate 410 for closing the housing 100 and terminals 420 and 430 supported by the cover plate 410 (see example). Figure 3 The cover plate 410 closes the opening 160 on the upper side of the housing 100.

[0154] Terminals 420 and 430 may include a first terminal 420 and a second terminal 430. The first terminal 420 may be mounted on one side of the cover plate 410 in the longitudinal direction, and the second terminal 430 may be mounted on the other side of the cover plate 410 in the longitudinal direction. The first terminal 420 may be positioned closer to the first sidewall 140 than to the second sidewall 150, and the second terminal 430 may be positioned closer to the second sidewall 150 than to the first sidewall 140.

[0155] The cover plate 410 can be arranged to face the electrode assembly 200 in a third-order direction. For example, the cover plate 410 can be arranged at a position spaced a predetermined distance from the electrode assembly 200 in a third-order direction. The cover plate 410 can be arranged parallel to the bottom wall 110 of the housing 100.

[0156] According to one or more embodiments, the lower portion of the first terminal 420 can be inserted into the cover plate 410. The upper portion of the first terminal 420 can protrude outward from the cover plate 410. Figure 3 An example of a first terminal 420 having a rectangular cross-sectional shape is shown, but the cross-sectional shape of the first terminal 420 is not limited to this, and it can be designed to have one or more suitable shapes such as a circular shape, an elliptical shape, a polygonal shape, etc. The first terminal 420 can be formed of a conductive material such as aluminum, nickel, copper, etc.

[0157] The first gasket 421 can be installed between the cover plate 410 and the first terminal 420. The first gasket 421 can electrically insulate the cover plate 410 and the first terminal 420 and prevent or reduce the possibility of moisture or foreign matter entering between the cover plate 410 and the first terminal 420.

[0158] According to one or more embodiments, the first gasket 421 may be formed of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) rubber, etc. The first gasket 421 may be fixed between the cover plate 410 and the first terminal 420 by extrusion, injection, bonding, etc.

[0159] The second terminal 430 may protrude outward from the cover plate 410 at a location spaced apart from and / or separated from the first terminal 420 (e.g., spaced apart or separated). The second terminal 430 may be electrically connected to the second electrode 220. Since the second electrode 220 according to one or more embodiments serves as a negative electrode, the second terminal 430 may be the negative electrode terminal of the secondary battery 2.

[0160] According to one or more embodiments, the lower portion of the second terminal 430 can be inserted into the cover plate 410. The upper portion of the second terminal 430 can protrude outside the cover plate 410. Figure 3 An example of a rectangular cross-sectional shape is shown for the second terminal 430, but the cross-sectional shape of the second terminal 430 is not limited to this and can be designed to have one or more suitable shapes such as circular, elliptical, polygonal, etc. The second terminal 430 can be formed of a conductive material such as aluminum, nickel, copper, etc.

[0161] The second gasket 431 can be installed between the cover plate 410 and the second terminal 430. The second gasket 431 can electrically insulate the cover plate 410 and the second terminal 430, and prevent or reduce the possibility of moisture or foreign matter entering between the cover plate 410 and the first terminal 430.

[0162] The second gasket 431 according to one or more embodiments may be formed of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) rubber, etc. The second gasket 431 may be fixed between the cover plate 410 and the second terminal 430 by extrusion, injection, bonding, etc.

[0163] The cover assembly 400 may further include an exhaust port 440 and a single exhaust element 450.

[0164] The vent 440 can be formed as a hole shape that vertically passes through both sides of the cover plate 410 in a third direction (e.g., through the entire thickness of the cover plate 410). The vent 440 can be configured to provide a path for flames, gases, smoke, etc., formed in the housing 100 to be discharged to the outside of the housing 100 if thermal runaway of the secondary battery 2 occurs due to overcurrent or the like (e.g., when thermal runaway of the secondary battery 2 occurs due to overcurrent or the like). The vent 440 can be arranged between the first terminal 420 and the second terminal 430. The cross-sectional shape of the vent 440 can be designed to have one or more suitable shapes such as an elliptical shape, a circular shape, a polygonal shape, etc.

[0165] Individual vent 450 is installed in vent 440 and can be opened and closed in response to changes in the internal pressure of housing 100. For example, when the secondary battery 2 is operating normally, the individual vent 450 can prevent or reduce the possibility of leakage of electrolyte or other substances from housing 100 or the entry of moisture, foreign matter, etc. into housing 100 by closing vent 440. If the secondary battery 2 experiences thermal runaway (e.g., when the secondary battery 2 experiences thermal runaway), the individual vent 450 can guide flames, gases, smoke, etc. formed in housing 100 and discharge them to the outside of housing 100 by opening vent 440.

[0166] The individual exhaust member 450 according to one or more embodiments can be formed in a generally plate shape. The individual exhaust member 450 can be fixed to the cover plate 410 by one or more suitable types of connection methods such as welding, bolting, mating, etc. The individual exhaust member 450 can be arranged in the exhaust hole 440, or arranged to face the exhaust hole 440 on the upper or lower side of the cover plate 410.

[0167] The thickness of the individual exhaust element 450 in a third direction may be less than the thickness of the cover plate 410. Accordingly, if the internal pressure of the housing 100 increases (e.g., when the internal pressure of the housing 100 increases), the individual exhaust element 450 may easily rupture or break. The individual exhaust element 450 may include a notch formed recessedly toward the interior of the individual exhaust element 450 so that it will preferentially rupture if the internal pressure of the housing 100 increases (e.g., when the internal pressure of the housing 100 increases).

[0168] The cover assembly 400 according to one or more embodiments may further include an electrolyte inlet 460 formed through the cover plate 410, and a sealing plug may be installed in the electrolyte inlet 460. The electrolyte inlet 460 may be arranged to be spaced apart from the vent 440 by a set distance or a predetermined distance. The electrolyte inlet 460 may be arranged between the first terminal 420 and the second terminal 430.

[0169] The cover assembly 400 according to one or more embodiments may further include an insulating plate 470.

[0170] An insulating plate 470 may be disposed between the cover plate 410 and the electrode assembly 200. The insulating plate 470 can prevent or reduce direct contact between the cover plate 410 and the electrode assembly 200, thereby insulating the cover plate 410 and the battery assembly 200.

[0171] According to one or more embodiments, the insulating plate 470 can be arranged facing the electrode assembly 200 in a third-party direction within the housing 100. For example, the cover plate 410, the insulating plate 470, and the electrode assembly 200 can be arranged sequentially in the third-party direction. The insulating plate 470 can be formed of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) rubber, etc.

[0172] The secondary battery 2 may further include a first current collector insulating plate 480 between the first current collector 500 and the electrode assembly 200 and a second current collector insulating plate 490 between the second current collector 550 and the electrode assembly 200.

[0173] Current collectors 600 and 700 are located in the internal space 101 of housing 100 and are electrically connected to terminals 420 and 430. The secondary battery 2 may further include current collectors 500 and 550 that connect terminals 420 and 430 and current collectors 600 and 700.

[0174] The current collectors 600 and 700 may include a first current collector 600 and a second current collector 700. The current collectors 500 and 550 may include a first current collector 500 connecting the first current collector 600 and the first terminal 420 and a second current collector 550 connecting the second current collector 700 and the second terminal 430.

[0175] The first current collector 600 and the first terminal 420 can be electrically connected through the first current collector 500, and the second current collector 700 and the second terminal 430 can be electrically connected through the second current collector 550.

[0176] The first sidewall 140 and the second sidewall 150 of the housing 100 may be arranged to face each other. The first current collector 600 may be located in the internal space 101 of the housing 100 between the electrode assembly 200 and the first sidewall 140. The second current collector 700 may be located in the internal space 101 between the electrode assembly 200 and the second sidewall 150.

[0177] refer to Figures 4 to 14 The first collector plate 600 can extend upwards to a third side. For example... Figure 6 and Figure 8 As shown, the first manifold 600 may include a flat portion 601, a manifold connection portion 607, a reinforcing rib portion 615, and a longitudinal rib portion 610.

[0178] The welding portion 320 of the first electrode terminal piece 300 can be welded to the flat portion 601 of the first current collector 600 (see example). Figure 9 The flat portion 601 may have a flat plate shape orthogonal (e.g., perpendicular) to the first direction. The welding portion 320 of the first electrode tab 300 may be located between the electrode assembly 200 and the first current collector 600, and may be welded to the side surface of the first current collector 600 facing the electrode assembly 200 (e.g., opposite to the electrode assembly 200).

[0179] For example, the welded portion 320 can be welded to the flat portion 601 by laser welding, in which the flat portion 601 is irradiated by a laser.

[0180] The first collector plate 600 may further include a plurality of weld line portions 670 formed by welding on the flat portion 601 (see example). Figure 6 and Figure 9 Multiple weld line portions 670 may extend in the width direction of the first manifold 600 and may be arranged to be spaced apart and / or separated from each other in the longitudinal direction of the first manifold 600 (e.g., spaced apart or separated). The width direction of the first manifold 600 may be the same as the second direction, and the longitudinal direction of the first manifold 600 may be the same as the third direction.

[0181] The first current collector 500 and the first current collector plate 600 can be joined by welding. For example, the end portion near the first sidewall 140 of the first current collector 500 and the current collector connection portion 607 of the first current collector plate 600 can be joined by laser welding.

[0182] The first manifold 600 may further include a manifold weld line portion 650 formed by welding on the manifold connection portion 607 and extending in the width direction of the first manifold 600 (see example). Figure 6For example, the current collector connection portion 607 may be provided at the upper end portion of the first current collector plate 600.

[0183] The reinforcing rib 615 can be formed to enhance the rigidity of the first manifold 600. Bending or twisting in the direction of shortening of the length of the first manifold 600 can be suppressed or reduced by the reinforcing rib 615.

[0184] The reinforcing rib portion 615 may be bent and protrude from the end of the flat portion 601 in the width direction, and extends parallel to the longitudinal direction of the flat portion 601. The reinforcing rib portion 615 may protrude toward the first sidewall 140. The reinforcing rib portions 615 may be provided in pairs at both ends of the flat portion 601 in the width direction.

[0185] The longitudinal rib portion 610 can be formed to enhance the rigidity of the first collector plate 600. Bending or twisting in the direction where the width of the first collector plate 600 decreases can be suppressed or reduced by the longitudinal rib portion 610. The longitudinal rib portion 610 can protrude in a stepped manner from the lower end of the first collector plate 600 toward the first sidewall 140.

[0186] refer to Figures 4 to 14 The second collector 700 can extend upwards to a third party. For example... Figure 7 and Figure 8 As shown, the second manifold 700 may include a flat portion 701, a manifold connection portion 707, a reinforcing rib portion 715, and a longitudinal rib portion 710.

[0187] The welding portion 370 of the second electrode terminal piece 350 can be welded to the flat portion 701 of the second current collector 700 (see example). Figure 12 The flat portion 701 may have a flat plate shape orthogonal (e.g., perpendicular) to the first direction. The welding portion 370 of the second electrode terminal piece 350 may be located between the electrode assembly 200 and the second current collector 700, and may be welded to the side surface of the second current collector 700 facing the electrode assembly 200 (e.g., opposite to the electrode assembly 200).

[0188] For example, the welded portion 370 can be welded to the flat portion 701 by laser welding, in which the flat portion 701 is irradiated by a laser.

[0189] The second collector plate 700 may further include a plurality of weld line portions 770 formed by welding on the flat portion 701 (see example). Figure 7 and Figure 12Multiple weld line portions 770 may extend in the width direction of the second manifold 700 and may be arranged to be spaced apart and / or separated from each other in the longitudinal direction of the second manifold 700 (e.g., spaced apart or separated). The width direction of the second manifold 700 may be the same as the second direction, and the longitudinal direction of the second manifold 700 may be the same as the third direction.

[0190] The second current collector 550 and the second current collector plate 700 can be joined by welding. For example, the end portion of the second current collector 550 near the second sidewall 150 and the current collector connection portion 707 of the second current collector plate 700 can be joined by laser welding.

[0191] The second manifold 700 may further include a manifold weld line portion 750 formed by welding on the manifold connection portion 707 and extending in the width direction of the second manifold 700 (see example). Figure 7 For example, the current collector connection portion 707 may be provided at the upper end portion of the second current collector 700.

[0192] The reinforcing rib 715 can be formed to enhance the rigidity of the second manifold 700. Bending or twisting in the direction of shortening of the length of the second manifold 700 can be suppressed or reduced by the reinforcing rib 715.

[0193] The reinforcing rib portion 715 may be bent and protrude from the end of the flat portion 701 in the width direction, and extend parallel to the longitudinal direction of the flat portion 701. The reinforcing rib portion 715 may protrude toward the second sidewall 150. The reinforcing rib portions 715 may be provided in pairs at both ends of the flat portion 701 in the width direction.

[0194] The longitudinal rib portion 710 can be formed to enhance the rigidity of the second manifold 700. Bending or twisting in the direction where the width of the second manifold 700 decreases can be suppressed or reduced by the longitudinal rib portion 710. The longitudinal rib portion 710 can protrude in a stepped manner from the lower end of the second manifold 700 toward the second sidewall 150.

[0195] refer to Figure 9 Each of the welding portions 320 of the plurality of first electrode tabs 300 is positioned offset to one side relative to the position of the root portion 310. The welding portion 320 can be positioned offset to one side relative to the position of the root portion 310 in the width direction of the first current collector 600. (Reference) Figure 9 The welded portion 320 can be positioned offset in the negative X-axis direction relative to the position of the root portion 310.

[0196] Each of the intermediate portions 330 of the plurality of first electrode tabs 300 has a peak PK1, which is positioned offset relative to the position of the root portion 310 toward the side to which the welding portion 320 is positioned. The peak PK1 can be positioned offset relative to the position of the root portion 310 toward the opposite side in the width direction of the first current collector 600. (Reference) Figure 9 The peak point PK1 can be positioned relative to the position of the root portion 310 in the positive X-axis direction.

[0197] The first current collector 600 can be positioned unbiased relative to the electrode assembly 200. In one or more embodiments, the first current collector 600 can be positioned unbiased to one side of the electrode assembly 200 in the thickness direction of the electrode assembly 200. (See reference...) Figure 9 For example, the coordinates of the center point of the thickness of the electrode assembly 200 in the X-axis direction within the internal space 101 of the housing 100 can be the same as the coordinates of the center point of the width of the first current collector 600. For example, the center line and / or axis of the first current collector 600 along a third direction (i.e., extending in a direction parallel to the Z-axis) are aligned with the center line and / or axis of the electrode assembly 200 along a third direction.

[0198] refer to Figure 12 Each of the welding portions 370 of the plurality of second electrode terminals 350 is positioned offset to one side relative to the position of the root portion 360. The welding portion 370 can be positioned offset to one side relative to the position of the root portion 360 in the width direction of the second current collector 700. (Reference) Figure 12 The welded portion 370 can be positioned offset in the negative X-axis direction relative to the position of the root portion 360.

[0199] Each of the intermediate portions 380 of the plurality of second electrode tabs 350 has a peak PK2, which is positioned offset relative to the position of the root portion 360 toward the side to which the welding portion 370 is positioned. The peak PK2 can be positioned offset relative to the position of the root portion 360 toward the opposite side in the width direction of the second current collector 700. (Reference) Figure 12 The peak point PK2 can be positioned relative to the root portion 360 degrees and offset along the positive X-axis.

[0200] The second current collector 700 can be positioned unbiased relative to the electrode assembly 200. In one or more embodiments, the second current collector 700 can be positioned unbiased to one side of the electrode assembly 200 in the thickness direction of the electrode assembly 200. (See reference...) Figure 12For example, the coordinates of the center point of the thickness of the electrode assembly 200 in the X-axis direction within the internal space 101 of the housing 100 can be the same as the coordinates of the center point of the width of the second current collector 700. For example, the center line and / or axis of the second current collector 700 along a third direction (i.e., extending in a direction parallel to the Z-axis) are aligned with the center line and / or axis of the electrode assembly 200 along a third direction.

[0201] In the secondary battery 2 according to one or more embodiments of the present disclosure, all of the plurality of electrode tabs 300 and 350 protruding from the electrode assembly 200 can be soldered to the current collectors 600 and 700. Therefore, the resistance between the electrode assembly 200 and the current collectors 600 and 700 can be reduced, thereby improving the charging / discharging performance.

[0202] Unlike secondary batteries where the electrode terminals are not soldered, in the secondary battery 2 according to one or more embodiments of the present disclosure, the electrode terminals are securely soldered. This eliminates the need to form an excessive number of electrode terminals in the electrode assembly 200 and to form excessively long (or significantly long) current collectors, thus reducing the production cost of the secondary battery 2 and the battery pack including it.

[0203] Hereinafter, a method for manufacturing a secondary battery according to one or more embodiments of the present disclosure is described. References Figure 3 , Figure 4 and Figures 9 to 14 The secondary battery manufacturing method includes operations such as providing (e.g., supplying) electrode assemblies and electrode terminals, bending electrode terminals, biasing current collectors, welding electrode terminals, and repositioning current collectors.

[0204] The operation of providing the electrode assembly and electrode tabs involves providing the electrode assembly 200 and a plurality of electrode tabs 300 and 350 protruding from the electrode assembly 200. The plurality of electrode tabs 300 and 350 may include a plurality of first electrode tabs 300 and a plurality of second electrode tabs 350. In the description of the secondary battery 2 according to one or more embodiments of this disclosure, the electrode assembly 200, the plurality of first electrode tabs 300, and the plurality of second electrode tabs 350 have already been described, and therefore their redundant description is unnecessary.

[0205] The operation of bending the electrode terminals involves bending multiple electrode terminals 300 and 350 such that the multiple electrode terminals 300 and 350 are in substantially the same direction relative to the electrode assembly 200. The operation of bending the electrode terminals may include bending a first electrode terminal 300 (e.g., multiple first electrode terminals 300) and bending a second electrode terminal 350 (e.g., multiple second electrode terminals 350).

[0206] refer to Figure 5 and Figure 10 The operation of bending the first electrode tabs may include the following: the operator fixes the electrode assembly 200 and uses the block 900 to push the plurality of first electrode tabs 300 that protrude from the electrode assembly 200 in the first direction and overlap in the second direction in a direction D11 parallel to the second direction.

[0207] Accordingly, the position of the welding portion 320 of the plurality of first electrode tabs 300 can be offset relative to the position of the root portion 310 in the negative (-) X-axis direction. However, the position of the middle portion 330 can be offset more in the negative (-) X-axis direction than the position of the root portion 310, and can be offset more in the positive (+) X-axis direction than the position of the welding portion 320.

[0208] refer to Figure 5 and Figure 13 The operation of bending the second electrode tabs may include the following: the operator fixes the electrode assembly 200 and uses the block 900 to push a plurality of second electrode tabs 350 that protrude from the electrode assembly 200 in the first direction and overlap in the second direction in a direction D21 parallel to the second direction.

[0209] Accordingly, the position of the welding portion 370 of the plurality of second electrode tabs 350 can be offset relative to the position of the root portion 360 in the negative (-) X-axis direction. However, the position of the middle portion 380 can be offset more in the negative (-) X-axis direction than the position of the root portion 360, and can be offset more in the positive (+) X-axis direction than the position of the welding portion 370.

[0210] Block 900 may be an example of a component for placing and pushing the first electrode tab 300 and the second electrode tab 350 protruding from the electrode assembly 200, and may be used with a different tool than block 900.

[0211] In the operation of biasing the current collectors, current collectors 600 and 700 are biased relative to the electrode assembly 200 in the direction in which the plurality of electrode terminals 300 and 350 are bent, such that current collectors 600 and 700 contact the plurality of electrode terminals 300 and 350. The operation of biasing the current collectors may include biasing the first current collector 600 and biasing the second current collector 700.

[0212] refer to Figure 10 and Figure 11 The operation of biasing the first current collector can include removing the block 900 while the plurality of first electrode tabs 300 are bent relative to the electrode assembly 200 and positioning the first current collector 600 in an biased manner to contact all the solder portions 320 of the plurality of first electrode tabs 300.

[0213] In such an embodiment, the first current collector 600 can be positioned biased to one side in the thickness direction of the electrode assembly 200. For example, based on Figure 11 The coordinate value of the center point of the width of the first current collector 600 in the X-axis direction can be offset in the negative (-) X-axis direction relative to the coordinate value of the center point of the thickness of the electrode assembly 200.

[0214] refer to Figure 13 and Figure 14 The operation of biasing the second current collector 700 may include removing the block 900 while the plurality of second electrode tabs 350 are bent relative to the electrode assembly 200 and positioning the second current collector 700 in an biased manner to contact all the solder portions 370 of the plurality of second electrode tabs 350.

[0215] In such an embodiment, the second current collector 700 can be positioned biased to one side in the thickness direction of the electrode assembly 200. For example, based on Figure 14 The coordinate value of the center point of the width of the second current collector 700 in the X-axis direction can be offset in the negative (-) X-axis direction relative to the coordinate value of the center point of the thickness of the electrode assembly 200.

[0216] The welding of electrode terminals involves welding the current collectors 600 and 700, as well as multiple electrode terminals 300 and 350, respectively. The welding of electrode terminals can include welding the first electrode terminal and welding the second electrode terminal.

[0217] For example, the operation of welding the first electrode terminals may include the operation of welding the flat portion 601 of the first current collector 600 and all the weld portions 320 of the plurality of first electrode terminals 300 by laser welding. In such an embodiment, as Figure 6 As shown, multiple welding line portions 670 can be formed on the flat portion 601.

[0218] For example, the operation of welding the second electrode terminals may include welding the flat portion 701 of the second current collector 700 and all weld portions 370 of the plurality of second electrode terminals 350 by laser welding. In such an embodiment, as Figure 7 As shown, multiple welding line portions 770 can be formed on the flat portion 701.

[0219] The repositioning operation of the current collectors is the operation of moving current collectors 600 and 700 to a position that is not biased relative to the electrode assembly 200. The repositioning operation of the current collectors may include the repositioning operation of the first current collector and the repositioning operation of the second current collector.

[0220] refer to Figure 9 and Figure 11 The operation of repositioning the first current collector plate may include fixing the electrode assembly 200 and moving the first current collector plate 600 relative to moving the block 900 (see example). Figure 10 The operation of moving the first electrode terminal 300 in the opposite direction D12 to the direction D11 along which it is bent. According to one or more embodiments of the present disclosure, the first current collector 600 may be fixed, and the electrode assembly 200 may be movable relative to the first current collector 600.

[0221] By repositioning the first current collector, the welding portion 320 of the first electrode terminal block 300 can be positioned offset to one side relative to the position of the root portion 310, and the peak point PK1 can be formed in the intermediate portion 330, offset to the opposite side of the side offset to the welding portion 320 relative to the position of the root portion 310.

[0222] The welding portion 320 of the first electrode terminal block 300 can be positioned offset to one side relative to the position of the root portion 310 in the width direction of the first current collector 600, and the peak point PK1 can be positioned offset to the opposite side relative to the position of the root portion 310 in the width direction of the first current collector 600.

[0223] For example, by executing based on Figure 9 In the operation of repositioning the first current collector, the coordinates of the center point of the thickness of the electrode assembly 200 in the X-axis direction and the coordinates of the center point of the width of the first current collector 600 can be the same. For example, the center line and / or axis of the first current collector 600 along a third direction (i.e., extending in the Z-axis direction) can be aligned with the center line and / or axis of the electrode assembly 200 along a third direction.

[0224] refer to Figure 12 and Figure 14 The operation of repositioning the second current collector 700 may include fixing the electrode assembly 200 and moving the second current collector 700 relative to moving the block 900 (see example). Figure 13 The operation of moving the second electrode terminal 350 in the opposite direction D22 to the direction D21 along which it is bent. According to one or more embodiments of the present disclosure, the second current collector 700 may be fixed, and the electrode assembly 200 may be movable relative to the second current collector 700.

[0225] By repositioning the second current collector, the welding portion 370 of the second electrode terminal block 350 can be positioned offset to one side relative to the position of the root portion 360, and the peak point PK2 can be formed in the intermediate portion 380, offset to the opposite side of the side offset to the welding portion 370 relative to the position of the root portion 360.

[0226] The welding portion 370 of the second electrode terminal block 350 can be positioned offset to one side relative to the position of the root portion 360 in the width direction of the second current collector 700, and the peak point PK2 can be positioned offset to the opposite side relative to the position of the root portion 360 in the width direction of the second current collector 700.

[0227] For example, by executing based on Figure 12 The operation of repositioning the second current collector can be performed such that the coordinates of the center point of the thickness of the electrode assembly 200 in the X-axis direction are the same as the coordinates of the center point of the width of the second current collector 700. For example, the center line and / or axis of the second current collector 700 along a third direction (i.e., extending in the Z-axis direction) are aligned with the center line and / or axis of the electrode assembly 200 along a third direction.

[0228] The electrode connection bending operation, the current collector offset operation, the electrode connection welding operation, and the current collector repositioning operation can be performed outside the housing 100.

[0229] The secondary battery manufacturing method according to one or more embodiments of the present disclosure may further include operations of connecting a cover assembly and a current collector, operations of connecting a current collector plate and a current collector, operations of inserting a current collector plate and an electrode terminal piece, and operations of connecting a cover plate.

[0230] refer to Figures 2 to 4 The operation of connecting the cover assembly and the current collector is to connect current collectors 500 and 550 to terminals 420 and 430 of the cover assembly 400, which includes a cover plate 410 and terminals 420 and 430. The operation of connecting the cover assembly and the current collector may include connecting the first current collector 500 to the first terminal 420 and connecting the second current collector 550 to the second terminal 430.

[0231] For example, the first terminal 420 and the first current collector 500 can be joined by laser welding, and the second terminal 430 and the second current collector 550 can be joined by laser welding.

[0232] The operation of connecting the manifold and the collector is to connect collectors 500 and 550 to manifolds 600 and 700 respectively. The operation of connecting the manifold and the collector may include connecting the first manifold 600 and the first collector 500, and connecting the second manifold 700 and the second collector 550.

[0233] For example, the operation may include welding the first manifold 600 and the first current collector 500 by laser welding, and the operation may include welding the second manifold 700 and the second current collector 550 by laser welding.

[0234] For reference Figure 6 and Figure 7 The first current collector plate 600 welded to the first current collector 500 may have a current collector welding line portion 650 extending in the width direction of the first current collector plate 600, and the second current collector plate 700 welded to the second current collector 550 may have a current collector welding line portion 750 extending in the width direction of the second current collector plate 700.

[0235] The operation of inserting the manifold and electrode terminals involves inserting the electrode assembly 200, along with the welded manifolds 600 and 700 and electrode terminals 300 and 350, into the housing 100. During this operation, current collectors 500 and 550 can also be inserted into the housing 100. The operations of providing the electrode assembly and electrode terminals, bending the electrode terminals, biasing the manifolds, welding the electrode terminals, repositioning the manifolds, connecting the cover assembly and current collectors, and connecting the manifolds and current collectors can be performed before the operation of inserting the manifold and electrode terminals.

[0236] The cover plate connection operation is the operation of connecting the cover plate 410 to the housing 100 so that the cover plate 410 seals the housing 100. For example, the outer peripheral edge of the cover plate 410 can be laser welded to the upper portion of the opening 160 of the housing 100 defined by the front wall 120, rear wall 130, first side wall 140 and second side wall 150.

[0237] According to this disclosure, all of the multiple electrode tabs protruding from the electrode assembly can be soldered to the current collector. Consequently, the resistance between the electrode assembly and the current collector can be reduced, thereby improving charging / discharging performance.

[0238] Unlike secondary batteries where the electrode terminals are not soldered, according to this disclosure, the electrode terminals are securely soldered. This eliminates the need to form an excessive number of electrode terminals in the electrode assembly and to form excessively long (or significantly long) current collectors, for example, to reduce resistance, thus reducing the production cost of the secondary battery and the battery pack including it.

[0239] Portable devices, vehicles, battery packs, batteries, equipment for manufacturing batteries, and / or any other related devices or components according to embodiments of the present disclosure described herein can be implemented using any suitable hardware, firmware (e.g., application-specific integrated circuits), software, or a combination of software, firmware, and hardware. For example, various components of the device can be formed on an integrated circuit (IC) chip or on separate IC chips. Furthermore, various components of the device can be implemented on flexible printed circuit films, tape-on-a-chip (TCP), printed circuit boards (PCBs), or formed on a substrate. Additionally, various components of the device can be programs or threads that run on one or more processors in one or more computing devices, execute computer program instructions, and interact with other system components to perform the various functions described herein. The computer program instructions are stored in memory, which can be implemented in the computing device using standard memory devices such as random access memory (RAM). The computer program instructions can also be stored in other non-transitory computer-readable media such as CD-ROMs, flash drives, etc. Furthermore, those skilled in the art will recognize that, without departing from the scope of embodiments of the present disclosure, the functionality of various computing devices can be combined or integrated into a single computing device, or the functionality of a particular computing device can be distributed across one or more other computing devices.

[0240] In view of the whole of this disclosure, those skilled in the art will understand that each suitable feature of the various embodiments of this disclosure may be combined in part or in whole or in combination with each other, and may be technically interlocked and operated in a variety of suitable ways, and unless otherwise stated or implied, each embodiment may be implemented independently of each other or in any suitable combination with each other.

[0241] It will be understood that, unless otherwise described, the description of features or aspects in each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Therefore, as will be apparent to those skilled in the art, features, characteristics, and / or elements described in connection with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless specifically instructed otherwise. It should be understood that the foregoing is illustrative of various exemplary embodiments and should not be construed as limiting to the specific embodiments disclosed herein, and various modifications to the disclosed embodiments and other exemplary embodiments are intended to be included within the spirit and scope of this disclosure as defined in the appended claims and their equivalents.

Claims

1. A secondary battery, comprising: The shell has an internal space; A cover assembly, including a cover plate for closing the housing and terminals supported by the cover plate; A current collector, located in the internal space and electrically connected to the terminals; Electrode assembly, housed within the internal space; as well as Multiple electrode tabs protrude from the electrode assembly, each of the multiple electrode tabs comprising: The root portion is connected to the electrode assembly; The welded portion is welded to the manifold and offset to one side relative to the position of the root portion; and The middle portion connects the root portion and the welded portion, and has a peak point offset to the opposite side of the said side.

2. The secondary battery according to claim 1, wherein the plurality of electrode tabs overlap in the thickness direction of the electrode assembly.

3. The secondary battery according to claim 1, wherein for each of the plurality of electrode terminals, The welded portion is offset to one side relative to the position of the root portion in the width direction of the manifold, and The peak point is offset to the opposite side of the root portion relative to the position of the root portion in the width direction of the collector plate.

4. The secondary battery according to claim 1, wherein the current collector includes a plurality of welding line portions welded to the welding portions of the electrode terminals, and extending in the width direction of the current collector and spaced apart in the longitudinal direction of the current collector.

5. The secondary battery of claim 1, wherein for each of the plurality of electrode tabs, the welded portion is located between the electrode assembly and the current collector, and is welded to the side of the current collector facing the electrode assembly.

6. The secondary battery according to claim 1, wherein the current collector comprises: The flat portion, wherein the welding portion of the electrode terminal piece is welded to the flat portion; as well as The reinforcing ribs bend and protrude from the end of the flat portion in the width direction and extend parallel to the longitudinal direction of the flat portion.

7. The secondary battery according to any one of claims 1 to 6, further comprising a current collector connecting the terminal and the current collector plate.

8. The secondary battery according to claim 7, wherein the current collector is welded to the current collector plate.

9. The secondary battery according to claim 7, wherein the electrode assembly comprises: First electrode; The second electrode is separated from the first electrode; as well as A diaphragm is located between the first electrode and the second electrode.

10. The secondary battery according to claim 9, wherein The electrode terminals include a first electrode terminal connected to the first electrode and a second electrode terminal connected to the second electrode. The current collector includes a first current collector welded to the first electrode terminal and a second current collector welded to the second electrode terminal. The terminal includes a first terminal and a second terminal spaced apart from the first terminal, and The current collector includes a first current collector connecting the first terminal and the first current collector plate, and a second current collector connecting the second terminal and the second current collector plate.

11. The secondary battery according to claim 10, wherein The first electrode and the first electrode terminal block are provided in a one-to-one correspondence, and The second electrode and the second electrode terminal are provided in a one-to-one correspondence of multiple.

12. The secondary battery according to claim 10, wherein The housing includes a first sidewall and a second sidewall facing each other. The first current collector is located in the internal space between the electrode assembly and the first sidewall, and The second current collector is located in the internal space between the electrode assembly and the second sidewall.

13. A method for manufacturing a secondary battery, the method comprising: Supply an electrode assembly having a plurality of electrode terminals protruding from the electrode assembly; The plurality of electrode terminals are bent so that they are in the same direction relative to the electrode assembly; The current collector is biased relative to the electrode assembly in the same direction in which the plurality of electrode terminals are bent, so that the current collector contacts the plurality of electrode terminals; Weld the current collector plate and the plurality of electrode terminals; as well as Move the current collector to a position that is not biased relative to the electrode assembly.

14. The method of claim 13, wherein the electrode terminal includes a root portion connected to the electrode assembly, a weld portion welded to the current collector, and an intermediate portion connecting the root portion and the weld portion, and The movement of the manifold causes the position of the welded portion relative to the root portion to be offset to one side, and a peak point offset to the opposite side is formed in the middle portion.

15. The method of claim 14, wherein by moving the manifold, the welded portion is offset to one side relative to the position of the root portion in the width direction of the manifold, and the peak point is offset to the opposite side of the one side relative to the position of the root portion in the width direction of the manifold.

16. The method according to any one of claims 13 to 15, further comprising inserting the electrode assembly, the welded current collector, and the electrode terminals into the housing.

17. The method according to claim 16, wherein, Prior to inserting the electrode assembly, the method further includes: A current collector is connected to a terminal of a cover assembly, the cover assembly including a cover plate and the terminal supported by the cover plate; and Connect the current collector to the current collector plate.

18. The method of claim 17, wherein connecting the current collector to the current collector plate comprises welding the current collector plate and the current collector.

19. The method of claim 17, further comprising: The cover is attached to the housing such that the cover seals the housing.

20. A battery pack, comprising: shell; as well as Multiple secondary batteries are located inside the casing. Each of the plurality of secondary batteries is a secondary battery according to any one of claims 1 to 12.

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