Secondary battery and manufacturing method of the same

Abstract

The disclosed secondary battery may include a positive electrode comprising a positive active material and a positive active material support supporting the positive active material, a negative electrode comprising a negative active material and a negative active material support supporting the negative active material, a separator disposed between the positive electrode and the negative electrode, a positive guide extending along one direction and connected to a first region along the periphery of the positive active material support, and a negative guide extending along one direction and connected to a second region along the periphery of the negative active material support.

Description

Technology Field

[0001] A secondary battery and a method for manufacturing the secondary battery are disclosed, wherein a positive electrode, a separator, and a negative electrode are arranged to be stacked. Background Technology

[0002] Unlike primary batteries, secondary batteries are batteries that undergo repeated charging and discharging. Small-capacity secondary batteries can be used in portable small electronic devices such as mobile phones, laptop computers, and camcorders.

[0003] Recently, there has been a surge in demand for high-output secondary batteries, which are used in small electronic devices such as wearable electronic devices. High-output secondary batteries can be configured such that a positive electrode, a separator, and a negative electrode are stacked sequentially multiple times.

[0004] The sizes of the positive electrode, separator, and negative electrode used in secondary batteries may differ from one another. Depending on the stacking method, the alignment of the positive electrode, separator, and negative electrode may be misaligned, and as the charging and discharging of the secondary battery are repeated, the reproducibility of the charge and discharge and the energy density may decrease. The problem to be solved

[0005] One embodiment of the present invention provides a secondary battery having a guide, a separator, and a cathode sequentially stacked, and a method for manufacturing the secondary battery.

[0006] In addition, a secondary battery and a method for manufacturing a secondary battery are provided, wherein the degree of alignment of multiple positive electrodes, separators, and negative electrodes is improved.

[0007] In addition, the invention provides a secondary battery and a method for manufacturing a secondary battery with improved convenience in the manufacturing process of stacking multiple anodes, separators, and cathodes.

[0008] In addition, a secondary battery with increased charge / discharge reproducibility and energy density and a method for manufacturing the secondary battery are provided. means of solving the problem

[0009] According to one aspect, a secondary battery may be provided comprising: a positive electrode having a positive active material and a positive active material support that supports the positive active material; a negative electrode having a negative active material and a negative active material support that supports the negative active material; a separator disposed between the positive electrode and the negative electrode; a positive guide extending along one direction and connected to a first region along the periphery of the positive active material support; and a negative guide extending along one direction and connected to a second region along the periphery of the negative active material support.

[0010] The first region and the second region may be positioned at different locations.

[0011] The absolute value of the difference between the first distance between the first end of the negative active material and the first end of the positive active material and the second distance between the second end of the negative active material and the second end of the positive active material may be 10 µm or more and 100 µm or less.

[0012] The above-mentioned positive guide may have a shape in which the width narrows as it approaches the positive active material support.

[0013] It further includes an anode connecting protrusion that extends along one direction and is connected to a third region along the periphery of the anode active material support, wherein the anode guide and the anode connecting protrusion may be arranged to extend along the same direction.

[0014] It further includes an anode connecting protrusion that extends along one direction and is connected to a third region along the periphery of the anode active material support; wherein the anode guide and the anode connecting protrusion may be arranged to extend along different directions.

[0015] The above-mentioned anode guides are provided in multiple numbers, and each of the multiple anode guides can be arranged along the periphery of the anode active material support so as to be spaced apart from one another at a predetermined interval.

[0016] The above positive active material support, the positive guide, and the positive connecting protrusion may have a thin plate shape including copper, aluminum, or a conductive material.

[0017] The anode guide has a length of 2% or more and 20% or less with respect to the diameter of the anode active material support, and the anode guide may have a width of 2% or more and 20% or less with respect to the diameter of the anode active material support.

[0018] The above cathode guide may have a shape in which the width narrows as it approaches the cathode active material support.

[0019] It further includes a cathode connecting protrusion that extends along one direction and is connected to a fourth region along the periphery of the cathode active material support; wherein the cathode guide and the cathode connecting protrusion may be arranged to extend along the same direction.

[0020] It further includes a cathode connecting protrusion that extends along one direction and is connected to a fourth region along the periphery of the cathode active material support; wherein the cathode guide and the cathode connecting protrusion may be arranged to extend along different directions.

[0021] The above-mentioned cathode guides are provided in multiple numbers, and each of the multiple cathode guides may be arranged along the periphery of the cathode active material support so as to be spaced apart from one another at a predetermined interval.

[0022] The above-mentioned cathode active material support, the above-mentioned cathode guide, and the cathode connecting protrusion may have a thin plate shape comprising copper, aluminum, or a conductive material.

[0023] The above-mentioned cathode guide has a length of 2% or more and 20% or less with respect to the diameter of the cathode active material support, and the above-mentioned cathode guide may have a width of 2% or more and 20% or less with respect to the diameter of the cathode active material support.

[0024] It may further include a membrane guide that extends along one direction and is connected to one region along the periphery of the membrane.

[0025] It may further include an anode current collector electrically connected to the anode and a cathode current collector electrically connected to the cathode.

[0026] A method for manufacturing a secondary battery can be provided, comprising: a first step of providing a stacking jig having a positive electrode guide mounting portion, a negative electrode guide mounting portion, and a separator guide mounting portion; a second step of placing a negative electrode so that a negative electrode guide is received in the negative electrode guide mounting portion; a third step of placing a separator so that a separator guide is received in the separator guide mounting portion; a fourth step of placing a positive electrode so that a positive electrode guide is received in the positive electrode guide mounting portion; a step of repeatedly performing two or more of the second to fourth steps at least twice; a step of interconnecting a plurality of positive electrode connecting protrusions attached to a plurality of positive electrodes and interconnecting a plurality of negative electrode connecting protrusions attached to a plurality of negative electrodes; a step of folding the positive electrode guide, the negative electrode guide, the separator guide, the plurality of positive electrode connecting protrusions, and the plurality of negative electrode connecting protrusions; and a step of connecting the plurality of positive electrodes to a positive electrode current collector and connecting the plurality of negative electrodes to a negative electrode current collector.

[0027] The anode guide extends along one direction and is connected to a first region along the periphery of the anode active material support, and the cathode guide extends along one direction and is connected to a second region along the periphery of the cathode active material support, and the first region and the second region may be positioned at different locations.

[0028] The absolute value of the difference between the first distance between the first end of the negative active material and the first end of the positive active material and the second distance between the second end of the negative active material and the second end of the positive active material may be 10 µm or more and 100 µm or less. Effects of the invention

[0029] According to one embodiment of the present invention, a secondary battery in which an anode, a separator, and a cathode are sequentially stacked, and a method for manufacturing the secondary battery can be provided.

[0030] In addition, a secondary battery and a method for manufacturing a secondary battery can be provided, in which the degree of alignment of multiple positive electrodes, separators, and negative electrodes is improved.

[0031] In addition, a secondary battery and a method for manufacturing a secondary battery can be provided, with improved convenience in the manufacturing process of stacking multiple anodes, separators, and cathodes.

[0032] In addition, a secondary battery with increased charge / discharge reproducibility and energy density and a method for manufacturing the secondary battery can be provided. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view of a secondary battery according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the secondary battery of FIG. 1 partially cut according to one embodiment. FIG. 3a is a plan view of an anode, an anode connecting protrusion, and an anode guide according to one example. FIG. 3B is a side view of the anode, anode connecting protrusion, and anode guide shown in FIG. 3A. FIG. 4a is a plan view of an anode, an anode connecting protrusion, and an anode guide according to another example. FIG. 4b is a plan view of an anode, an anode connecting protrusion, and an anode guide according to another example. FIG. 5a is a plan view of a cathode, a cathode connecting protrusion, and a cathode guide according to one example. FIG. 5b is a side view of the cathode, cathode connection protrusion, and cathode guide shown in FIG. 5a. FIG. 6a is a plan view of a cathode, a cathode connection protrusion, and a cathode guide according to another example. FIG. 6b is a plan view of a cathode, a cathode connection protrusion, and a cathode guide according to another example. Figure 7 is a plan view of a separator and a separator guide according to one example. FIGS. 8a to 8h illustrate each step of manufacturing a secondary battery according to one example. Specific details for implementing the invention

[0034] Hereinafter, a secondary battery according to embodiments of the present invention will be described in detail with reference to the attached drawings. In the drawings below, the same reference numerals refer to the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the embodiments described below are merely illustrative, and various modifications are possible from these embodiments. Also, in this specification, expressions such as "upper" or "upper" may include not only being in contact and directly above, but also being above in a non-contact state. Additionally, in this specification, "one surface" and "other surface" refer to two surfaces located opposite each other, and "one direction" and "other direction" refer to two directions exactly opposite each other.

[0035] FIG. 1 is a perspective view of a secondary battery according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the secondary battery of FIG. 1 partially cut according to one embodiment.

[0036] Referring to FIGS. 1 and FIGS. 2, a secondary battery (1) according to one embodiment of the present invention may be a coin-type secondary battery. However, the secondary battery (1) described in this specification is not limited to a coin-type secondary battery.

[0037] A secondary battery (1) according to one example may include a positive electrode (10), a negative electrode (20), a separator (30), a positive electrode current collector (40), a negative electrode current collector (50), a positive electrode can (61) that also functions as a positive electrode terminal, a negative electrode can (62) that also functions as a negative electrode terminal, and a gasket (63).

[0038] The positive electrode (10) may include a positive electrode active material support (100: see FIG. 3a) and a positive electrode active material (150: see FIG. 3a) supported by the positive electrode active material support (100). According to one example, the positive electrode (10) may be provided in a plate-like shape extending along a plane. Details regarding the positive electrode (10) will be described in more detail with reference to FIG. 3a through FIG. 4b.

[0039] The cathode (20) may include a cathode active material support (200: see FIG. 5a) and a cathode active material (250: see FIG. 5a) supported by the cathode active material support (200). According to one example, the cathode (20) may be provided in a plate-like shape extending along a plane and may be positioned to face the anode (10). Details regarding the cathode (20) will be described in more detail with reference to FIG. 5a through 6b.

[0040] A separator (30) can be placed between the positive electrode (10) and the negative electrode (20) to separate the positive electrode (10) and the negative electrode (20). According to one example, the separator (30) may be provided in a plate-like shape extending along a plane and may be placed between the positive electrode (10) and the negative electrode (20). Details regarding the separator (30) will be described in more detail with reference to FIG. 7.

[0041] The positive current collector (40) can be electrically connected to the positive electrode (10). According to one example, the positive current collector (40) is provided in a plate-like shape comprising a metallic material, for example, copper, aluminum, or a conductive material, and can be placed between the positive electrode (10) and the positive electrode can (61) to be described later.

[0042] The negative current collector (50) can be electrically connected to the negative electrode (20). According to one example, the negative current collector (50) is provided in a plate-like shape comprising a metallic material, for example, copper, aluminum, or a conductive material, and can be placed between the negative electrode (20) and the negative electrode can (62) to be described later.

[0043] The positive can (61) is a receiving portion capable of accommodating a positive electrode (10), a negative electrode (20), a separator (30), a positive current collector (40), and a negative current collector (50). Additionally, the positive can (61) may be positioned to contact the positive current collector (40) to function as a positive terminal. According to one example, the positive can (61) may comprise one or more of nickel, aluminum, stainless steel, or titanium, or an alloy thereof.

[0044] The cathode can (62) is a receiving portion that can isolate the anode (10), cathode (20), separator (30), anode current collector (40), and cathode current collector (50) from the outside by combining with the anode can (61). Additionally, the cathode can (62) can be positioned to contact the cathode current collector (50) to function as a cathode terminal. According to one example, the cathode can (62) may include one or more of nickel, aluminum, stainless steel, or titanium, or an alloy thereof.

[0045] The gasket (63) is an insulating member positioned between the positive can (61) and the negative can (62) to mutually insulate the positive can (61) and the negative can (62). Additionally, the gasket (63) is a sealing member positioned between the positive can (61) and the negative can (62) to isolate the interior of the positive can (61) and the negative can (62) from the outside. According to one example, the gasket (63) may be provided with a hollow annular structure. Furthermore, the gasket (63) may include a material having insulating and sealing properties, such as polypropylene. However, the present disclosure is not limited thereto, and any shape and any material having sealing and insulating properties may be applied to the gasket (63).

[0046] As shown in FIG. 2, a secondary battery (1) can be manufactured by stacking the negative electrode (20), separator (30), positive electrode (10), and positive electrode can (61) in order with the negative electrode can (62) positioned underneath, and by compressing the positive electrode can (61) and the negative electrode can (62) with a gasket (63) interposed. In the process of stacking the negative electrode (20), separator (30), and positive electrode (10) repeatedly in sequence according to one embodiment, the alignment of the negative electrode (20), separator (30), and positive electrode (10) may be misaligned. If the alignment of the negative electrode (20), separator (30), and positive electrode (10) is misaligned, lithium ions emitted from the positive electrode (10) cannot be easily transferred to the negative electrode (20). Below, a more detailed description is provided of an alignment guide required to align the negative electrode (20), the separator (30), and the positive electrode (10) during the process of sequentially stacking them, and a method for manufacturing a secondary battery using the same.

[0047] FIG. 3a is a plan view of an anode, an anode connecting protrusion, and an anode guide according to one example. FIG. 3b is a side view of the anode, an anode connecting protrusion, and an anode guide shown in FIG. 3a.

[0048] Referring to FIGS. 3a and 3b, a positive electrode (10) according to one example may include a positive electrode active material support (100) and a positive electrode active material (150) supported by the positive electrode active material support (100). The positive electrode active material (150) may be arranged to be coated on one or both sides of the positive electrode active material support (100). As an example, the positive electrode active material (150) may include one or more of a nickel-cobalt-manganese (NCM) active material, a nickel-cobalt-aluminum (NCA) active material, a lithium-cobalt oxide (LCO) active material, a lithium nickel oxide (LNO) active material, and a lithium iron phosphate (LFP) active material.

[0049] Additionally, the positive active material support (100) is provided as a metal thin plate having a predetermined thickness and may have various shapes depending on the shape of the positive can (61) and the negative can (62). As an example, the positive active material support (100) may have a circular shape as shown in FIG. 3a, but the present disclosure is not limited thereto and may have a polygonal shape. In addition, the positive active material support (100) may include copper, aluminum, or a conductive material.

[0050] According to one example, the positive active material (150) can be coated on one or both sides of the positive active material support (100) using a coater. As an example, when the positive active material (150) is coated on one side of the positive active material support (100), the positive active material support (100) can be positioned closest to the positive can (61). Additionally, when the positive active material (150) is coated on both sides of the positive active material support (100), the positive active material support (100) can be positioned to face the negative active material (250) on both sides.

[0051] The positive guide (110) can be connected to the positive active material support (100) to guide the stacking path of the positive (10). According to one example, the positive guide (110) may have a shape that extends along one direction. At this time, the shape of the positive guide (110) may have any shape corresponding to the positive guide seating portion (710; see FIG. 8a) provided in the stacking jig (70; see FIG. 8a) to be described later. As an example, the positive guide (110) may have a shape in which the width narrows as it approaches the positive active material support (100). Accordingly, by preventing the positive guide (110) from moving along one direction, the stacking position of the positive (10) can be fixed. However, the present disclosure is not limited thereto, and the positive guide (110) may have any shape that prevents the positive guide from moving by being accommodated in the positive guide seating portion (710).

[0052] According to one example, the positive guide (110) may be connected to a first region (111) along the periphery of the positive active material support (100). As an example, as shown in FIG. 3a, the positive guide (110) extending along one direction may be connected to protrude along the periphery of the positive active material support (100). As an example, the positive guide (110) may have a length (A1) that is 2% or more and 20% or less of the diameter (R1) of the positive active material support (100), for example, when the positive active material support (100) is provided in a circular shape. Additionally, the positive guide (110) may have a width (B1) of 2% or more and 20% or less with respect to the longest length of the positive active material support (100), for example, when the positive active material support (100) is provided in a circular shape.

[0053] Additionally, the positive electrode guide (110) may be provided in the shape of a thin plate containing the same material as the positive electrode active material support (100), for example, copper, aluminum, or a conductive material, and may be formed integrally with the positive electrode active material support (100). Accordingly, the positive electrode (10) connected to the positive electrode guide (110) can be stacked at a predetermined position according to the stacking path guided by the positive electrode guide (110).

[0054] The positive connection protrusion (120) is an electrical connection portion for electrically connecting a plurality of positive electrodes (10) stacked along a first direction (Z). According to one example, the positive connection protrusion (120) may have a shape extending along one direction and may be connected to a third region (121) along the periphery of the positive active material support (100). At this time, the third region (121) to which the positive connection protrusion (120) is connected may be positioned at a mutually spaced location so as not to interfere with the first region (111) to which the positive guide (110) is connected.

[0055] As an example, the positive connection protrusion (120) may be positioned to protrude from the outside of the positive active material support (100) as shown in FIG. 3a. In this case, the positive connection protrusion (120) may be provided in the shape of a thin plate containing the same material as the positive active material support (100), for example, aluminum, and may be formed integrally with the positive active material support (100) and the positive guide (110). Accordingly, the positive (10) connected to the positive connection protrusion (120) may be electrically connected to another positive (10) stacked along the first direction (Z direction).

[0056] As described above, the positive guide (110) and the positive connection protrusion (120) can be connected to the positive active material support (100) so as not to interfere with each other. Accordingly, the positive guide (110) can be placed at various locations that do not interfere with the positive connection protrusion (120), and may be composed of multiple guides.

[0057] FIG. 4a is a plan view of an anode, an anode connecting protrusion, and an anode guide according to another example. FIG. 4b is a plan view of an anode, an anode connecting protrusion, and an anode guide according to yet another example.

[0058] Referring to FIG. 3a, an anode guide (110) according to one example may be positioned to extend along the same direction as an anode connecting protrusion (120). As an example, the anode guide (110) may be positioned to extend along one direction (K1), and the anode connecting protrusion (120) may also be positioned to extend along the same one direction (K1). When the anode guide (110) and the anode connecting protrusion (120) are positioned to extend along the same direction, ease of manufacturing can be improved.

[0059] Additionally, referring to FIG. 4a, the anode guide (110) according to one example may be positioned to extend along a direction different from the anode connecting protrusion (120). As an example, the anode guide (110) is positioned in one direction (K 21 It is arranged to extend along ), wherein the positive connecting protrusion (120) is in one direction (K 21 ) and a different unidirectional (K 22 It can be arranged to extend along the anode guide (110) and the anode connecting protrusion (120). When the anode guide (110) and the anode connecting protrusion (120) are arranged to extend along different directions, the phenomenon of the anode (10) moving along the one direction in which the anode guide (110) and the anode connecting protrusion (120) are extended can be prevented.

[0060] Additionally, referring to FIG. 4b, the anode guides (110) according to one example may be provided in multiple numbers. As an example, the multiple anode guides (110) may include a first anode guide (112) and a second anode guide (113). The first anode guide (112) and the second anode guide (113) may extend along different directions. Additionally, the first anode guide (112) and the second anode guide (113) may be arranged along the periphery of the anode active material support (100) so as to be spaced apart from each other with a predetermined distance between them. Although the above-described embodiment describes two anode guides, the present disclosure is not limited thereto, and any number of anode guides (110) that do not interfere with the anode connecting protrusion (120) may be arranged along the periphery of the anode active material support (100).

[0061] FIG. 5a is a plan view of a cathode, a cathode connecting protrusion, and a cathode guide according to one example. FIG. 5b is a side view of the cathode, a cathode connecting protrusion, and a cathode guide shown in FIG. 5a.

[0062] Referring to FIGS. 5a and 5b, a cathode (20) according to one example may include a cathode active material support (200) and a cathode active material (250) supported by the cathode active material support (200). The cathode active material (250) may be arranged to be coated on one or both sides of the cathode active material support (200). As an example, the cathode active material (250) may include one or more of lithium, graphite, and Si / Sn alloy.

[0063] Additionally, the negative active material support (200) is provided as a metal thin plate having a predetermined thickness and may have various shapes depending on the shape of the positive can (61) and the negative can (62). As an example, the negative active material support (200) may have a circular shape as shown in FIG. 5a, but the present disclosure is not limited thereto and may have a polygonal shape. In addition, the negative active material support (200) may include copper, aluminum, or a conductive material.

[0064] According to one example, the negative active material (250) can be coated on one or both sides of the negative active material support (200) using a coater. As an example, when the negative active material (250) is coated on one side of the negative active material support (200), the negative active material support (200) can be positioned closest to the negative can (62). Additionally, when the negative active material (250) is coated on both sides of the negative active material support (200), the negative active material support (200) can be positioned to face the positive active material (150) on both sides.

[0065] The cathode guide (210) can be connected to the cathode active material support (200) to guide the stacking path of the cathode (20). According to one example, the cathode guide (210) may have a shape that extends along one direction. At this time, the shape of the cathode guide (210) may have any shape corresponding to the cathode guide mounting portion (720; see FIG. 8a) provided in the stacking jig (70; see FIG. 8a) to be described later. As an example, the cathode guide (210) may have a shape in which the width narrows as it approaches the cathode active material support (200). Accordingly, by preventing the cathode guide (210) from moving along one direction, the stacking position of the cathode (20) can be fixed. However, the present disclosure is not limited thereto, and the cathode guide (210) may have any shape that prevents the cathode guide from moving by being accommodated in the cathode guide mounting portion (720).

[0066] According to one example, the cathode guide (210) may be connected to a second region (211) along the periphery of the cathode active material support (200). As an example, as shown in FIG. 5a, the cathode guide (210) extending along one direction may be connected to protrude along the periphery of the cathode active material support (200). As an example, the cathode guide (210) may have a length (A2) of 2% or more and 20% or less of the diameter (R2) of the cathode active material support (200), for example, when the cathode active material support (200) is provided in a circular shape. Additionally, the cathode guide (210) may have a width (B2) of 2% or more and 20% or less with respect to the longest length of the cathode active material support (200), for example, when the cathode active material support (200) is provided in a circular shape.

[0067] Additionally, the cathode guide (210) may be provided in the shape of a thin plate containing the same material as the cathode active material support (200), for example, copper, aluminum, or a conductive material, and may be formed integrally with the cathode active material support (200). Accordingly, the cathode (20) connected to the cathode guide (210) may be stacked at a predetermined position according to the stacking path guided by the cathode guide (210).

[0068] The cathode connection protrusion (220) is an electrical connection portion for electrically connecting a plurality of cathodes (20) stacked along a first direction (Z). According to one example, the cathode connection protrusion (220) may have a shape extending along one direction and may be connected to a fourth region (221) along the periphery of the cathode active material support (200). At this time, the fourth region (221) to which the cathode connection protrusion (220) is connected may be positioned at a mutually spaced location so as not to interfere with the second region (211) to which the cathode guide (210) is connected.

[0069] As an example, the cathode connection protrusion (220) may be positioned to protrude from the outside of the cathode active material support (200) as shown in FIG. 5a. In this case, the cathode connection protrusion (220) may be provided in the shape of a thin plate containing the same material as the cathode active material support (200), for example, copper, aluminum, or a conductive material, and may be formed integrally with the cathode active material support (200) and the cathode guide (210). Accordingly, the cathode (20) connected to the cathode connection protrusion (220) may be electrically connected to another cathode (20) stacked along the first direction (Z direction).

[0070] As described above, the cathode guide (210) and the cathode connecting protrusion (220) can be connected to the cathode active material support (200) so as not to interfere with each other. Accordingly, the cathode guide (210) can be placed at various locations that do not interfere with the cathode connecting protrusion (220), and may be composed of multiple guides.

[0071] FIG. 6a is a plan view of a cathode, a cathode connection protrusion, and a cathode guide according to another example. FIG. 6b is a plan view of a cathode, a cathode connection protrusion, and a cathode guide according to yet another example.

[0072] Referring to FIG. 5a, a cathode guide (210) according to one example may be arranged to extend along the same direction as a cathode connection protrusion (220). As an example, the cathode guide (210) may be arranged to extend along one direction (L1), and the cathode connection protrusion (220) may also be arranged to extend along the same one direction (L1). When the cathode guide (210) and the cathode connection protrusion (220) are arranged to extend along the same direction, ease of manufacturing can be improved.

[0073] Additionally, referring to FIG. 6a, the cathode guide (210) according to one example may be arranged to extend along a direction different from the cathode connection protrusion (220). As an example, the cathode guide (210) is in one direction (L 21 It is arranged to extend along ), and at this time, the cathode connection protrusion (220) is arranged in one direction (L 21 ) and a different unidirectional (L 22 It can be arranged to extend along the (). When the cathode guide (210) and the cathode connecting protrusion (220) are arranged to extend along different directions, the phenomenon in which the cathode (20) moves along the one direction in which the cathode guide (210) and the cathode connecting protrusion (220) are extended can be prevented.

[0074] Additionally, referring to FIG. 6b, the cathode guides (210) according to one example may be provided in multiple numbers. As an example, the multiple cathode guides (210) may include a first cathode guide (212) and a second cathode guide (213). The first cathode guide (212) and the second cathode guide (213) may extend along different directions. Additionally, the first cathode guide (212) and the second cathode guide (213) may be arranged along the periphery of the cathode active material support (200) so as to be spaced apart from each other with a predetermined distance between them. Although the above-described embodiment describes two cathode guides, the present disclosure is not limited thereto, and any number of cathode guides (210) that do not interfere with the cathode connecting protrusion (220) may be arranged along the periphery of the cathode active material support (200).

[0075] Figure 7 is a plan view of a separator and a separator guide according to one example.

[0076] Referring to FIG. 7, a separator (30) according to one example may be provided in a flat plate shape extending along a plane. As an example, the separator (30) may include one or more materials capable of separating the positive electrode (10) and the negative electrode (20), such as a polyethylene film or a polypropylene film. For example, the separator (30) may be provided in a thin plate shape having a predetermined thickness and may have various shapes depending on the shapes of the positive electrode (10) and the negative electrode (20). As an example, the separator (30) may have a circular shape as shown in FIG. 7, but the present disclosure is not limited thereto and may have a polygonal shape.

[0077] The separator guide (310) is connected to the separator (30) and can guide the stacking path of the separator (30). According to one example, the separator guide (310) may have a shape that extends along one direction. At this time, the shape of the separator guide (310) may have any shape corresponding to the separator guide seating portion (730; see FIG. 8a) provided in the stacking jig (70; see FIG. 8a) to be described later.

[0078] According to one example, the separator guide (310) may be connected to a region along the periphery of the separator (30). As an example, as shown in FIG. 7, the separator guide (310) extending along one direction may be connected to protrude along the periphery of the separator (30). In this case, the separator guide (310) may be provided in the shape of a thin plate containing the same material as the separator (30), and may be formed integrally with the separator (30). Accordingly, the separator (30) connected to the separator guide (310) may be stacked at a predetermined position according to the stacking path guided by the separator guide (310).

[0079] FIGS. 8a to 8h illustrate each step of manufacturing a secondary battery according to one example.

[0080] Referring to FIG. 8a, a stacking jig according to one example may be provided. The stacking jig (70) according to one example may include a support mounting portion (700), an anode guide mounting portion (710), a cathode guide mounting portion (720), a separator guide mounting portion (730), an anode connection protrusion mounting portion (740), and a cathode connection protrusion mounting portion (750).

[0081] The support mounting portion (700) is a receiving portion in which a positive active material support (100), a negative active material support (200), and a separator (30) can be mounted. According to one example, the support mounting portion (700) may be formed along the stacking direction of the positive (10), the negative (20), and the separator (30), i.e., the first direction (Z direction). At this time, the support mounting portion (700) may have a shape corresponding to the shape of the positive active material support (100), the negative active material support (200), and the separator (30) to be received. For example, the support mounting portion (700) may be provided in a shape corresponding to the circular shape of the positive active material support (100), the negative active material support (200), and the separator (30), as shown in FIG. 8a. Additionally, the size of the support mounting portion (700) may be determined according to the size of the largest recipient among the positive active material support (100), negative active material support (200), and separator (30) to be received. As an example, the diameter of the separator (30) among the positive active material support (100), negative active material support (200), and separator (30) may be provided to be the largest, and in this case, the diameter of the support mounting portion (700) may be determined to correspond to the diameter of the separator (30).

[0082] The anode guide mounting portion (710) is a receiving portion in which the anode guide (110) can be mounted. According to one example, the anode guide mounting portion (710) may be formed to extend along a first direction (Z direction). At this time, the anode guide mounting portion (710) may have a shape corresponding to the shape of the anode guide (110) to be received. For example, the anode guide mounting portion (710) may be provided with a shape corresponding to the fan shape of the anode guide (110) as shown in FIG. 8a. In addition, the size of the anode guide mounting portion (710) may be determined according to the size of the anode guide (110) to be received.

[0083] The cathode guide mounting portion (720) is a receiving portion in which the cathode guide (210) can be mounted. According to one example, the cathode guide mounting portion (720) may be formed to extend along a first direction (Z direction). At this time, the cathode guide mounting portion (720) may have a shape corresponding to the shape of the cathode guide (210) to be received. For example, the cathode guide mounting portion (720) may be provided with a shape corresponding to the fan shape of the cathode guide (210) as shown in FIG. 8a. In addition, the size of the cathode guide mounting portion (720) may be determined according to the size of the cathode guide (210) to be received.

[0084] The membrane guide mounting portion (730) is a receiving portion in which the membrane guide (310) can be mounted. According to one example, the membrane guide mounting portion (730) may be formed to extend along a first direction (Z direction). At this time, the membrane guide mounting portion (730) may have a shape corresponding to the shape of the membrane guide (310) to be received. In addition, the size of the membrane guide mounting portion (730) may be determined according to the size of the membrane guide (310) to be received.

[0085] The positive connection protrusion seating portion (740) and the negative connection protrusion seating portion (750) are receiving portions in which the positive connection protrusion (120) and the negative connection protrusion (220) can be seated. According to one example, the positive connection protrusion seating portion (740) and the negative connection protrusion seating portion (750) may be formed to extend along a first direction (Z direction). At this time, the positive connection protrusion seating portion (740) and the negative connection protrusion seating portion (750) may have a shape corresponding to the shape of the positive connection protrusion (120) and the negative connection protrusion (220) to be received. Additionally, the size of the positive connection protrusion seating portion (740) and the negative connection protrusion seating portion (750) may be determined according to the size of the positive connection protrusion (120) and the negative connection protrusion (220) to be received.

[0086] According to one example, the positive guide mounting portion (710), the negative guide mounting portion (720), the separator guide mounting portion (730), the positive connection protrusion mounting portion (740), and the negative connection protrusion mounting portion (750) may be arranged so as to be spaced apart from each other along the periphery of the support mounting portion (700) at a predetermined interval. Accordingly, the positive guide mounting portion (710), the negative guide mounting portion (720), the separator guide mounting portion (730), the positive connection protrusion mounting portion (740), and the negative connection protrusion mounting portion (750) may be arranged along the periphery of the support mounting portion (700) so as not to interfere with each other.

[0087] Referring to FIG. 8b, a second step of arranging the cathode (20) so that the cathode guide (210) is received in the cathode guide seating portion (720) according to one example can be performed. According to one example, to stack the cathode (20), a cathode active material support (200) can be placed in the support seating portion (700), a cathode guide (210) can be placed in the cathode guide seating portion (720), and a cathode connecting protrusion (220) can be placed in the cathode connecting protrusion seating portion (750). At this time, since the positive active material support (100) and the separator (30) can be received in the support seating portion (700) in which the cathode active material support (200) is received, the size and shape of the support seating portion (700) can be made to correspond to the size and shape of the cathode active material support (200). Accordingly, the position of the negative active material support (200) may not be aligned in the support mounting portion (700). At this time, the negative guide (210) can be aligned in the position of the negative active material support (200) in the support mounting portion (700) by being mounted on the negative guide mounting portion (720) which has a corresponding shape and size.

[0088] Referring to FIG. 8c, a third step of arranging the separator (30) so that the separator guide (310) is received in the separator guide mounting portion (730) according to one example can be performed. According to one example, in order to stack the separator (30) on the cathode (20), the separator (30) can be placed in the support mounting portion (700), and the separator guide (310) can be placed in the separator guide mounting portion (730). At this time, the separator guide (310) can be seated in the separator guide mounting portion (730) having a corresponding shape and size, thereby aligning the position of the separator (30) in the support mounting portion (700).

[0089] Referring to FIG. 8d, a fourth step of arranging the anode (10) so that the anode guide (110) is received in the anode guide mounting portion (710) according to one example can be performed. According to one example, in order to laminate the anode (10) onto the separator (30), the anode active material support (100) can be placed in the support mounting portion (700), the anode guide (110) can be placed in the anode guide mounting portion (710), and the anode connecting protrusion (120) can be placed in the anode connecting protrusion mounting portion (740). At this time, the anode guide (110) can be placed in the anode guide mounting portion (710) having a corresponding shape and size, thereby aligning the position of the anode active material support (100) in the support mounting portion (700).

[0090] As described above, the positive guide (110) and the negative guide (210) can be seated on the positive guide seat (710) and the negative guide seat (720), which are positioned at different locations along the periphery of the support member seat (700). Accordingly, the positive guide (110) can be connected to a first region (111) along the periphery of the positive active material support (100), and the negative guide (210) can be connected to a second region (211) along the periphery of the negative active material support (200). At this time, by positioning the first region (111) and the second region (211) at different locations, interference that may occur between the positive guide (110) and the negative guide (210) can be prevented.

[0091] Referring to FIG. 8e, two or more of the second to fourth steps according to one example may be performed repeatedly two or more times. As an example, in the first step, the cathode (20), the separator (30), and the anode (10) are stacked in that order, in the second step, the separator (30) and the cathode (20) are stacked, and in the third step, the separator (30) and the anode (10) are stacked. At this time, in the cathode (20) placed at the bottom or top, the cathode active material (250) may be coated on one side of the cathode active material support (200), and in the cathode (20) placed at the center, the cathode active material (250) may be coated on both sides of the cathode active material support (200). Additionally, in the anode (10) positioned at the top or bottom, the anode active material (150) may be coated on one side of the anode active material support (100), and in the anode (10) positioned at the center, the anode active material (150) may be coated on both sides of the anode active material support (100).

[0092] As illustrated in FIG. 8e, in order to stably absorb lithium ions emitted from the positive electrode (10), it is preferable that the coating area of ​​the negative electrode active material (250) coated on the negative electrode active material support (200) is larger than the coating area of ​​the positive electrode active material (150) coated on the positive electrode active material support (100). If the coating area of ​​the positive electrode active material (150) is aligned so as to extend beyond the coating area of ​​the negative electrode active material (250), lithium ions emitted from the positive electrode (10) may move unevenly to the negative electrode (20). Therefore, alignment between the coating area of ​​the positive electrode active material (150) and the coating area of ​​the negative electrode active material (250) must be achieved.

[0093] As described above, alignment between the coating area of ​​the positive active material (150) and the coating area of ​​the negative active material (250) can be achieved by using the positive guide mounting portion (710) and the negative guide mounting portion (720) provided in the stacking jig (70), and the positive guide (110) and the negative guide (210) connected to the positive (10) and the negative (20). According to one example, when alignment is achieved between the coating area of ​​the positive active material (150) and the coating area of ​​the negative active material (250), the absolute value of the difference between the first distance (F1) between the first end (251) of the negative active material (250) and the first end (151) of the positive active material (150) and the second distance (F2) between the second end (252) of the negative active material (250) and the second end (152) of the positive active material (150) may be 10 µm or more and 100 µm or less.

[0094] Referring to FIG. 8f, according to one example, a plurality of positive connection protrusions (120) attached to a plurality of positive electrodes (10) can be interconnected, and a plurality of negative connection protrusions (220) attached to a plurality of negative electrodes (20) can be interconnected. As an example, when a plurality of positive electrodes (10) are arranged to be stacked, a connecting member is required to electrically connect the plurality of positive electrodes (10). According to one example, by connecting the plurality of positive connection protrusions (120) attached to a plurality of positive electrodes (10) to contact each other, the plurality of positive electrodes (10) can be electrically connected to each other. Additionally, by connecting the plurality of negative connection protrusions (220) attached to a plurality of negative electrodes (20) to contact each other, the plurality of negative electrodes (20) can be electrically connected to each other. At this time, a plurality of positive connection protrusions (120) and a plurality of negative connection protrusions (220) may be arranged so as to be spaced apart with a predetermined distance between them so as not to come into electrical contact with each other.

[0095] Referring to FIG. 8g, according to one example, an anode guide (110), a cathode guide (210), a separator guide (310), a plurality of anode connection protrusions (120), and a plurality of cathode connection protrusions (220) can be folded. As an example, a plurality of stacked anodes (10), cathodes (20), and separators (30) can be accommodated in an anode can (61) and a cathode can (62) shown in FIG. 1. Accordingly, an extra anode guide (110), cathode guide (210), separator guide (310), a plurality of anode connection protrusions (120), and a plurality of cathode connection protrusions (220) extending beyond the coating area of ​​the anode active material (150) and cathode active material (250) can be folded along a first direction (Z direction). At this time, an insulating part (not shown) is disposed at the ends of the plurality of positive connection protrusions (120) and the plurality of negative connection protrusions (220), thereby insulating the plurality of positive connection protrusions (120) and the plurality of negative connection protrusions (220) from each other.

[0096] Referring to FIG. 8h, according to one example, a plurality of positive electrodes (10) may be connected to a positive electrode current collector (40), and a plurality of negative electrodes (20) may be connected to a negative electrode current collector (50). As an example, the positive electrode current collector (40) may be arranged to be electrically connected to a positive electrode (10) placed at the top, and the negative electrode current collector (50) may be arranged to be electrically connected to a negative electrode (20) placed at the bottom. Although the positive electrode current collector (40) and the negative electrode current collector (50) are defined as the top and bottom, the present disclosure is not limited thereto and may be arranged at any location. A plurality of electrode structures connected to the positive electrode current collector (40) and the negative electrode current collector (50) are housed in a positive electrode can (61) that functions as a positive electrode terminal and a negative electrode can (62) that functions as a negative electrode terminal, and a gasket (63) may be placed between the positive electrode can (61) and the negative electrode can (62) to perform insulation and sealing functions.

[0097] Although preferred embodiments according to the present invention have been described above with reference to the drawings and embodiments, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the scope of protection of the present invention should be determined by the appended claims. Explanation of the symbols

[0098] 1: Secondary battery 10: Anode 20: Cathode 30: Separator 40: Positive current collector 50: Cathode current collector 61: Positive can 62: Cathode can 63: Gasket 70: Lamination jig 100: Positive electrode active material support 110: Anode Guide 150: Cathode active material 200: Cathode active material support 210: Cathode guide 220: Cathode connection protrusion 250: Cathode active material 700: Support mounting portion 710: Anode guide mounting part 720: Cathode guide mounting part 730: Separator guide seating portion 740: Positive connection protrusion seating part 750: Cathode connection protrusion seating part

Claims

Claim 1 A secondary battery comprising: an anode having an anode active material and an anode active material support that supports the anode active material; a cathode having a cathode active material and a cathode active material support that supports the cathode active material; a separator disposed between the anode and the cathode; an anode guide extending along one direction and connected to a first region along the periphery of the anode active material support; a cathode guide extending along one direction and connected to a second region along the periphery of the cathode active material support; an anode connecting protrusion extending along one direction and connected to a third region along the periphery of the anode active material support; and a cathode connecting protrusion extending along one direction and connected to a fourth region along the periphery of the cathode active material support. Claim 2 A secondary battery according to claim 1, wherein the first region and the second region are positioned at different locations. Claim 3 A secondary battery according to claim 1, wherein the absolute value of the difference between the first distance between the first end of the negative electrode active material and the first end of the positive electrode active material and the second distance between the second end of the negative electrode active material and the second end of the positive electrode active material is 10 µm or more and 100 µm or less. Claim 4 A secondary battery according to claim 1, wherein the positive guide has a shape in which the width becomes narrower as it approaches the positive active material support. Claim 5 A secondary battery according to claim 1, wherein the positive guide and the positive connecting protrusion are arranged to extend along the same direction. Claim 6 A secondary battery according to claim 1, wherein the positive electrode guide and the positive electrode connecting protrusion are arranged to extend along different directions. Claim 7 A secondary battery according to claim 1, wherein the positive guides are provided in a plurality, and each of the plurality of positive guides is arranged along the periphery of a positive active material support so as to be spaced apart from one another at a predetermined interval. Claim 8 A secondary battery according to claim 6, wherein the positive active material support, the positive guide, and the positive connecting protrusion have a thin plate shape comprising copper, aluminum, or a conductive material. Claim 9 A secondary battery according to claim 1, wherein the positive guide has a length of 2% or more and 20% or less with respect to the diameter of the positive active material support, and the positive guide has a width of 2% or more and 20% or less with respect to the diameter of the positive active material support. Claim 10 A secondary battery according to claim 1, wherein the cathode guide has a shape in which the width becomes narrower as it approaches the cathode active material support. Claim 11 A secondary battery according to claim 1, wherein the cathode guide and the cathode connecting protrusion are arranged to extend along the same direction. Claim 12 A secondary battery according to claim 1, wherein the cathode guide and the cathode connecting protrusion are arranged to extend along different directions. Claim 13 A secondary battery according to claim 1, wherein the cathode guides are provided in a plurality, and each of the plurality of cathode guides is arranged along the periphery of a cathode active material support so as to be spaced apart from one another at a predetermined interval. Claim 14 A secondary battery according to claim 12, wherein the negative electrode active material support, the negative electrode guide, and the negative electrode connecting protrusion have a thin plate shape comprising copper, aluminum, or a conductive material. Claim 15 A secondary battery according to claim 1, wherein the cathode guide has a length of 2% or more and 20% or less with respect to the diameter of the cathode active material support, and the cathode guide has a width of 2% or more and 20% or less with respect to the diameter of the cathode active material support. Claim 16 A secondary battery according to claim 1, further comprising a separator guide that extends along one direction and is connected to one region along the periphery of the separator. Claim 17 A secondary battery according to claim 1, further comprising a positive current collector electrically connected to the positive electrode and a negative current collector electrically connected to the negative electrode. Claim 18 A method for manufacturing a secondary battery according to claim 1, comprising: a first step of providing a stacking jig having a positive electrode guide mounting portion, a negative electrode guide mounting portion, and a separator guide mounting portion; a second step of arranging a negative electrode so that a negative electrode guide is received in the negative electrode guide mounting portion; a third step of arranging a separator so that a separator guide is received in the separator guide mounting portion; a fourth step of arranging a positive electrode so that a positive electrode guide is received in the positive electrode guide mounting portion; a step of repeatedly performing two or more of the second to fourth steps at least twice; a step of interconnecting a plurality of positive electrode connecting protrusions attached to a plurality of positive electrodes and interconnecting a plurality of negative electrode connecting protrusions attached to a plurality of negative electrodes; a step of folding the positive electrode guide, the negative electrode guide, the separator guide, the plurality of positive electrode connecting protrusions, and the plurality of negative electrode connecting protrusions; and a step of connecting the plurality of positive electrodes to a positive electrode current collector and connecting the plurality of negative electrodes to a negative electrode current collector. Claim 19 A method for manufacturing a secondary battery according to claim 18, wherein the positive guide extends along one direction and is connected to a first region along the periphery of the positive active material support, and the negative guide extends along one direction and is connected to a second region along the periphery of the negative active material support, and the first region and the second region are positioned at different locations. Claim 20 A method for manufacturing a secondary battery according to claim 18, wherein the absolute value of the difference between the first distance between the first end of the negative electrode active material and the first end of the positive electrode active material and the second distance between the second end of the negative electrode active material and the second end of the positive electrode active material is 10 µm or more and 100 µm or less.

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