Secondary battery

Abstract

A secondary battery includes: an electrode assembly with a positive electrode and a negative electrode, a case into which the electrode assembly is inserted, a cap plate coupled to the case, and an insulating member disposed between the cap plate and the electrode assembly, wherein the insulating member includes a guide hole located below an electrolyte injection hole formed in the cap plate, and a guide protruding downwardly from the guide hole to facilitate a movement of an electrolyte.

Description

secondary battery

[0001] The present invention relates to a secondary battery capable of being charged and discharged.

[0002] Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has rapidly increased, and the development of electric vehicles, energy storage batteries, robots, and satellites has been in full swing, research on high-performance secondary batteries capable of repeated charging and discharging is actively being conducted.

[0003] Currently commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are attracting attention for their advantages, including virtually no memory effect compared to nickel-based batteries, free charging and discharging, a very low self-discharge rate, and high energy density.

[0004] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Furthermore, the lithium secondary battery comprises a positive electrode plate and a negative electrode plate coated with the positive and negative electrode active materials, an electrode assembly in which the positive and negative electrode plates are positioned with a separator between them, and an outer case that seals and houses the electrode assembly together with an electrolyte.

[0005] Meanwhile, lithium secondary batteries can be classified into can-type secondary batteries, in which the electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which the electrode assembly is housed in a pouch made of aluminum laminate sheet, depending on the shape of the battery case. Can-type secondary batteries can be further classified into cylindrical batteries and square batteries, depending on the shape of the metal can.

[0006] In the case of square batteries, an electrolyte injection port is provided. If the electrolyte injection port is blocked by foreign substances or internal components, the electrolyte injection speed may decrease or the electrolyte may flow backward.

[0007] The present invention provides a secondary battery into which an electrolyte can be easily injected.

[0008] A secondary battery according to one aspect of the present invention includes an electrode assembly having a positive electrode and a negative electrode, a case into which the electrode assembly is inserted, a cap plate coupled to the case, and an insulating member disposed between the cap plate and the electrode assembly, wherein the insulating member may include a guide hole positioned below an electrolyte injection port formed in the cap plate and a guide portion protruding downward from the guide hole to assist the movement of the electrolyte.

[0009] According to one aspect of the present invention, the guide part may include a support positioned at the lower portion of the guide hole to partially block the guide hole and an internal hole formed in the support to move a fluid.

[0010] According to one aspect of the present invention, the inner hole may face the electrolyte injection port.

[0011] According to one aspect of the present invention, the inner hole may be located at the longitudinal center of the guide portion.

[0012] According to one aspect of the present invention, the guide portion further includes a guide rim surrounding the lower portion of the guide hole, and the support can be fixed to the guide rim.

[0013] According to one aspect of the present invention, the guide portion may further include a first opening and a second opening formed between the side end of the support and the inner wall of the guide rim.

[0014] According to one aspect of the present invention, the width of the support may be about 0.2 to 0.6 times the diameter of the guide hole.

[0015] According to one aspect of the present invention, the diameter of the inner hole is formed smaller than the diameter of the electrolyte injection port, and the inner hole can be located within a lower region corresponding to the electrolyte injection port.

[0016] According to one aspect of the present invention, the width of the support may be formed to be larger than the diameter of the electrolyte injection port.

[0017] According to one aspect of the present invention, the support may include a first inclined rod and a second inclined rod that are formed to be inclined downward from the outer side of the guide hole toward the center.

[0018] According to one aspect of the present invention, the inner hole may be formed so that its diameter gradually increases toward the bottom.

[0019] According to one aspect of the present invention, the support may include a wedge portion whose cross-sectional area gradually decreases toward the bottom.

[0020] According to one aspect of the present invention, a shock-absorbing bar extending in the diameter direction of the inner hole may be formed in the inner hole.

[0021] According to one aspect of the present invention, the inner hole may have one inlet and multiple outlets.

[0022] According to one aspect of the present invention, the inner hole may include an upper passage extending inward from the upper surface and a plurality of lower passages inclined with respect to the upper passage.

[0023] According to one aspect of the present invention, a plurality of auxiliary holes are formed in the guide rim, and the auxiliary holes can be arranged along the circumferential direction of the guide rim.

[0024] According to one aspect of the present invention, the cap plate has a vent hole formed therein for exhausting gas, and the insulating member includes an exhaust portion protruding toward the bottom of the case and having a plurality of exhaust openings, and the exhaust portion can be located below the vent hole.

[0025] The discharge guide according to one aspect of the present invention may include a support frame having a ring shape and a plurality of blocking bars that support a blocking bar and are fixed to the support frame and extend in the width direction of the insulating member.

[0026] According to one aspect of the present invention, the discharge opening may be formed so that its cross-sectional area gradually increases toward the cap plate.

[0027] According to one aspect of the present invention, a porous plate is arranged on the bottom of the exhaust section, and the porous plate can be positioned between the exhaust openings.

[0028] According to one aspect of the present invention, the cap plate may be formed with a terminal hole into which a terminal electrically connected to the electrode assembly is inserted, a coupling protrusion protruding toward the insulating member and surrounding the terminal hole, and a coupling groove into which the coupling protrusion is inserted may be formed in the insulating member.

[0029] In the cap plate according to one aspect of the present invention, a lower groove into which a gasket and the insulating member are inserted may be formed on the inside of the coupling protrusion, and a sealing rim may be formed on the inside of the coupling groove in the insulating member to be inserted into the lower groove.

[0030] When the length of the insulating member according to one aspect of the present invention is DL1 and the width of the insulating member is DW1, 8DW1≤DL1≤15DW1 can be satisfied.

[0031] According to one aspect of the present invention, the length of the insulating member may be 190 mm to 310 mm, and the width of the insulating member may be 18 mm to 82 mm.

[0032] When the thickness of the insulating member according to one aspect of the present invention is DT1 and the thickness of the cap plate is CT1, 0.4CT1≤DT1≤0.9CT1 can be satisfied.

[0033] According to one aspect of the present invention, the thickness of the insulating member may be 0.9 mm to 1.8 mm, and the thickness of the cap plate may be 1.5 mm to 3.5 mm.

[0034] According to a secondary battery according to one embodiment of the present invention, a guide portion for injecting an electrolyte is formed in an insulating member disposed at the lower portion of a cap plate, so that the electrolyte can be easily injected.

[0035] The following drawings attached to this specification illustrate embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0036] FIG. 1 is a perspective view illustrating a secondary battery according to a first embodiment of the present invention.

[0037] Fig. 2 is a perspective view showing a partially disassembled configuration of the secondary battery of Fig. 1.

[0038] Figure 3 is a cross-sectional view taken along line Ⅲ-Ⅲ in Figure 1.

[0039] Figure 4 is a plan view illustrating a secondary battery according to the first embodiment of the present invention.

[0040] Figure 5 is a perspective view from above of an insulating member of a secondary battery according to the first embodiment of the present invention.

[0041] Figure 6 is a perspective view of an insulating member of a secondary battery according to the first embodiment of the present invention, viewed from below.

[0042] Figure 7 is a bottom view of an insulating member of a secondary battery according to the first embodiment of the present invention.

[0043] FIG. 8 is a partial cross-sectional view illustrating a cap plate and an insulating member according to a first embodiment of the present invention.

[0044] Fig. 9 is a cutaway perspective view showing a guide portion of an insulating member according to the first embodiment of the present invention.

[0045] Fig. 10 is a cross-sectional view showing an exhaust section of an insulating member according to the first embodiment of the present invention.

[0046] Fig. 11 is a cross-sectional view showing a guide part according to a second embodiment of the present invention.

[0047] Fig. 12 is a perspective view showing a support according to a second embodiment of the present invention.

[0048] Fig. 13 is a cross-sectional view showing a guide part according to a third embodiment of the present invention.

[0049] Fig. 14 is a cross-sectional view showing a guide part according to the fourth embodiment of the present invention.

[0050] Fig. 15 is a perspective view showing a support according to a fourth embodiment of the present invention.

[0051] Fig. 16 is a perspective view from above of an insulating member of a secondary battery according to a fifth embodiment of the present invention.

[0052] Figure 17 is a longitudinal cross-sectional view of a secondary battery according to the fifth embodiment of the present invention.

[0053] Figure 18 is an enlarged view of A1 in Figure 17.

[0054] Fig. 19 is a cross-sectional view showing a guide part according to the sixth embodiment of the present invention.

[0055] Fig. 20 is a perspective view showing a guide part according to the seventh embodiment of the present invention.

[0056] Fig. 21 is a perspective view showing an exhaust section of an insulating member according to the eighth embodiment of the present invention.

[0057] Figure 22 is a cross-sectional view showing an exhaust section of an insulating member according to the eighth embodiment of the present invention.

[0058] Fig. 23 is a cross-sectional view showing an exhaust section of an insulating member according to the ninth embodiment of the present invention.

[0059] In some of the accompanying drawings, corresponding components are designated by the same reference numerals. Those skilled in the art will appreciate that the drawings illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to facilitate understanding of various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated relative to other elements. Furthermore, elements of known technology that are useful or essential in commercially feasible embodiments may often not be depicted so as not to obscure the spirit of various embodiments of the present invention.

[0060] The present invention is susceptible to various modifications and embodiments. Therefore, specific embodiments will be described in detail and illustrated. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0061] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In the present invention, it should be understood that the terms "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0062] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. Please note that, where possible, identical components are represented by identical reference numerals throughout the drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted.

[0063] Below, a secondary battery according to one embodiment of the present invention is described.

[0064] FIG. 1 is a perspective view illustrating a secondary battery according to a first embodiment of the present invention, FIG. 2 is a perspective view illustrating a state in which a part of the secondary battery of FIG. 1 is disassembled, FIG. 3 is a cross-sectional view taken along line Ⅲ-Ⅲ in FIG. 1, and FIG. 4 is a plan view illustrating a secondary battery according to the first embodiment of the present invention.

[0065] Referring to FIGS. 1 to 3, a secondary battery (100) according to the present embodiment may include an electrode assembly (10) including a positive electrode (11) and a negative electrode (12), a case (30) accommodating the electrode assembly (10), a cap plate (21) coupled to the case (30), terminals (23, 24) installed on the cap plate (21), and an insulating member (50) disposed between the cap plate (21) and the electrode assembly (10).

[0066] The electrode assembly (10) includes a positive electrode (11), a negative electrode (12), and a separator (13) interposed between the positive electrode (11) and the negative electrode (12). The positive electrode (11), the separator (13), and the negative electrode (12) may be formed in a laminated structure or in a structure wound in a jelly roll shape. In addition, the electrode assembly (10) may be formed in a structure in which the positive electrode (11) and the negative electrode (12) are alternately inserted between separators (13) bent in a zigzag shape. In addition, the electrode assembly (10) may be formed in various forms, such as an all-solid type.

[0067] The positive electrode (11) and the negative electrode (12) may include a coated portion, which is a region where an active material is applied to a metal foil, and a non-coated portion, where no active material is applied. The positive electrode non-coated portion (15) may protrude from a side end of the positive electrode (11), and the negative electrode non-coated portion (16) may protrude from a side end of the negative electrode (12). The positive electrode non-coated portion (15) and the negative electrode non-coated portion (16) may protrude in the same direction, but may protrude in a direction (z-axis direction) toward the cap plate (21).

[0068] The positive electrode non-conductive portion (15) and the negative electrode non-conductive portion (16) are formed in a tab shape and can be spaced apart in the width direction (y-axis direction) of the case (30). The positive electrode non-conductive portions (15) and the negative electrode non-conductive portions (16) can be stacked in the thickness direction (x-axis direction) of the case (30).

[0069] In addition, the positive electrode non-conductive part (15) can be connected to the first terminal (23) via a current collecting member (41), and the negative electrode non-conductive part (16) can be connected to the second terminal (24) via a current collecting member (42).

[0070] A separator (13) is placed between the positive electrode (11) and the negative electrode (12), and the separator (13) prevents or suppresses short circuits and enables the movement of ions. If the secondary battery (100) is composed of an all-solid-state battery, a solid electrolyte may be placed between the positive electrode (11) and the negative electrode (12) instead of the separator (13).

[0071] The case (30) may be formed in the shape of a box having an internal space for accommodating the electrode assembly (10). The case (30) may be formed in various shapes, such as a square shape or a cylindrical shape. One electrode assembly (10) or multiple electrode assemblies (10) may be inserted into the case (30).

[0072] An electrolyte can be accommodated together with an electrode assembly (10) inside the case (100). The electrolyte can be in the form of a liquid, solid, or gel.

[0073] The cap plate (21) is made of a plate material that covers the opening of the case (30) and may have a shape corresponding to the shape of the opening of the case (30). The cap plate (21) may be fixed to the case (30) by welding.

[0074] An electrolyte injection port (H1) for injecting electrolyte and a vent hole (H2) in which a vent member (27) is installed may be formed in the cap plate (21). A sealing plug (28) that blocks the electrolyte injection port (H1) may be installed in the electrolyte injection port (H1), and a vent member (27) that opens at a preset pressure may be formed in the vent hole (H2).

[0075] Terminals (23, 24) are connected to the cap plate (21), and one or two terminals (23, 24) may be installed on the cap plate (21). When two terminals (23, 24) are installed on the cap plate (21), the first terminal (23) may be configured as a positive terminal, and the second terminal (24) may be configured as a negative terminal. When one terminal is installed on the cap plate (21), the case (30) may be charged negatively.

[0076] The first terminal (23) and the second terminal (24) may be formed in a plate shape. A gasket (25) for insulation may be installed between the first terminal (23) and the cap plate (21), and a gasket (26) for insulation may also be installed between the second terminal (24) and the cap plate (21). In addition, the gaskets (25, 26) may be connected downward and positioned between the current collecting member (41, 42) and the cap plate (21). The gaskets (25, 26) may be formed as a single member or may be divided into multiple members.

[0077] The first terminal (23) is electrically connected to the positive electrode non-conducting portion (15) via the first current collecting member (41), and the second terminal (24) can be electrically connected to the negative electrode non-conducting portion (16) via the second current collecting member (42).

[0078] The first terminal (23) and the second terminal (24) are formed in a plate shape, and a hole into which a connecting pillar of the first current collecting member (41) or the second current collecting member (42) is inserted can be formed in the center of the first terminal (23) and the second terminal (24).

[0079] The electrode assembly (10) may include two positive electrode arrays having the same polarity, and the positive electrode arrays may be arranged so as not to overlap in the width direction (y-axis direction) and thickness direction (x-axis direction) of the electrode assembly (10).

[0080] Additionally, the electrode assembly (10) may include two cathode-free arrays having the same polarity, and the cathode-free arrays may be arranged so as not to overlap in the width direction (y-axis direction) and thickness direction (x-axis direction) of the electrode assembly (10).

[0081] The first collector member (41) may include a center portion (41a), a first collector projection (41b) protruding from one side end of the center portion (41a), a second collector projection (41c) protruding from the other side end of the center portion, and a connecting pillar (41d) protruding from the center portion toward the cap plate. The first collector projection (41b) and the second collector projection (41c) may be spaced apart in the longitudinal direction (y-axis direction) and the thickness direction (x-axis direction) of the electrode assembly.

[0082] The first collector protrusion (41b) and the second collector protrusion (41c) can be joined with a positive electrode non-conducting portion (15). The positive electrode non-conducting portion arrays can be bent in opposite directions and fixed to the first collector protrusion (41b) or the second collector protrusion (41c) by welding. The positive electrode non-conducting portions (15) can be joined to the upper surface of the first collector protrusion (41b) or the second collector protrusion (41c).

[0083] The connecting column (41d) is formed as a cylinder and can be formed integrally with the center portion. However, the present invention is not limited thereto, and the connecting column can also be fixed to the center portion by welding.

[0084] In addition, the second collector member (42) may include a center portion (42a), a first collector projection (42b) protruding from one side end of the center portion (42a), a second collector projection (42c) protruding from the other side end of the center portion (42a), and a connecting pillar (42d) protruding from the center portion (42a) toward the cap plate (21). The first collector projection (42b) and the second collector projection (42c) may be spaced apart in the longitudinal direction (y-axis direction) and the thickness direction (x-axis direction) of the electrode assembly (10).

[0085] The first collector protrusion (42b) and the second collector protrusion (42c) can be joined with negative electrode non-coated parts (16). The negative electrode non-coated part arrays can be bent in opposite directions and fixed by welding to the first collector protrusion (42b) or the second collector protrusion (42c). The negative electrode non-coated parts (16) can be joined to the upper surface of the first collector protrusion (42b) or the second collector protrusion (42c).

[0086] The connecting pillar (41d) of the first current collector (41) can be joined by welding while inserted into the first terminal (23), and the connecting pillar (42d) of the second current collector (42) can be joined by welding while inserted into the second terminal (24).

[0087] FIG. 5 is a perspective view from above of an insulating member of a secondary battery according to a first embodiment of the present invention, FIG. 6 is a perspective view from below of an insulating member of a secondary battery according to a first embodiment of the present invention, FIG. 7 is a bottom view from below of an insulating member of a secondary battery according to a first embodiment of the present invention, FIG. 8 is a partial cross-sectional view illustrating a cap plate and an insulating member according to a first embodiment of the present invention, and FIG. 9 is a cut-away perspective view illustrating a guide portion of an insulating member according to a first embodiment of the present invention.

[0088] Referring to FIGS. 5 to 9, an insulating member (50) is installed between the cap plate (21) and the electrode assembly (10) to insulate the cap plate (21) and the electrode assembly (10). The insulating member (50) may have a shape corresponding to the cap plate (21), and may be formed in the shape of an elongated square plate. The upper insulating member (50) may be arranged to face the cap plate (21), but may be arranged parallel to the cap plate (21).

[0089] The insulating member (50) may include a base plate (51) in the shape of a square plate and two support protrusions (52) protruding downward toward the case (30) from both edges of the base plate (51) in the longitudinal direction (y-axis direction).

[0090] A first hole (53) into which the lower end of the gasket (25) of the first terminal (23) is inserted and a second hole (54) into which the lower end of the gasket (26) of the second terminal (24) is inserted may be formed in the base plate (51).

[0091] In addition, the insulating member (50) may include a guide hole (71) located at the bottom of the electrolyte injection port (H1), a guide portion (70) protruding downward from the guide hole (71), and an exhaust portion (55) located at the bottom of the vent hole (H2). In Fig. 5, the guide portion (70) protruding downward is indicated by a dotted line.

[0092] The guide portion (70) protruding downward from the guide hole (71) may include a guide rim (75) that surrounds the lower portion of the guide hole (71), a support member (72) positioned at the lower portion of the guide hole (71) to partially block the guide hole (71), and an internal hole (73) formed in the support member (72) to move the fluid. According to one embodiment, the guide rim (75) may be formed in a circular ring shape, and the support member (72) may be formed of a rod that is connected in a straight line. The support member (72) is fixed to the lower portion of the guide rim (75) and may extend in the diametric direction of the guide hole (71).

[0093] The inner hole (73) is located at the longitudinal center of the support (72) and may be formed to face the electrolyte injection port (H1). The diameter (D3) of the inner hole (73) is formed to be smaller than the diameter (D1) of the electrolyte injection port (H1), and the inner hole (73) may be located inside a lower region corresponding to the electrolyte injection port (H1).

[0094] Meanwhile, the diameter (D2) of the guide hole (71) may be formed larger than the diameter (D1) of the electrolyte injection port (H1). The width (W1) of the support (72) may be formed to be about 0.2 to 0.6 times the diameter (D2) of the guide hole (71). However, the width (W1) of the support (72) is formed to be larger than the diameter (D1) of the electrolyte injection port (H1), and may be formed to be about 1.1 to 1.5 times the diameter (D1) of the electrolyte injection port (H1).

[0095] A first opening (76) and a second opening (78) are formed between the side of the support (72) and the inner wall of the guide rim (75), and the first opening (76) and the second opening (78) are open toward the bottom, but can be spaced apart with the support (72) therebetween.

[0096] The insulating member (50) is positioned at the bottom of the cap plate (21), and electrolyte is injected into the electrolyte injection port (H1) while the cap plate (21) is coupled to the case (30). When a guide portion (70) having a guide rim (75), a support (72), and a guide hole (71) is formed on the insulating member (50), the electrolyte injection port (H1) is prevented or suppressed from being blocked by the lower structure, and the electrolyte can be easily injected.

[0097] In addition, since the inner hole (73) is located directly below the electrolyte injection port (H1), the electrolyte can be prevented or suppressed from flowing back into the case (30) by moving through the inner hole (73), and in addition, when the inner hole (73) is blocked or a large amount of electrolyte is supplied, the electrolyte can be injected into the case through the first opening (76) and the second opening (78) formed on both sides of the support (72).

[0098] Fig. 10 is a cross-sectional view showing an exhaust section of an insulating member according to the first embodiment of the present invention.

[0099] Referring to FIGS. 5 and 10, the exhaust section (55) is positioned at the bottom of the vent hole (H2) and has a plurality of exhaust openings. The exhaust section (55) may include a support frame (56) that protrudes downward and has a ring shape, and a plurality of dividing bars (55d) that are fixed to the support frame (56) and extend in the width direction (x-axis direction) of the insulating member (50). A first exhaust opening (55a) is formed at the center of the exhaust section (55), and a second exhaust opening (55b) and a third exhaust opening (55c) may be formed on both sides of the first exhaust opening (55a). The first exhaust opening (55a) has a larger cross-sectional area than the second exhaust opening (55b) and the third exhaust opening (55c).

[0100] In this way, when the exhaust part (55) is formed in the insulating member (50), when the pressure inside the case (30) increases, the vent member (27) breaks at the preset pressure, so that the gas inside the case (30) can be easily discharged.

[0101] Below, a secondary battery according to a second embodiment of the present invention is described.

[0102] Fig. 11 is a cross-sectional view showing a guide part according to a second embodiment of the present invention, and Fig. 12 is a perspective view showing a support according to the second embodiment of the present invention.

[0103] Referring to FIGS. 11 and 12, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0104] A guide portion (80) is formed in the insulating member, and the guide portion (80) may include a guide rim (85) that surrounds the lower part of the guide hole (81), a support (82) that is positioned at the lower part of the guide hole (81) and partially blocks the guide hole (81), and an internal hole (83) that is formed in the support (82) and moves a fluid.

[0105] The guide rim (85) may be formed in the shape of a circular ring or a square ring, and the support member (82) may include a first inclined rod (82a) and a second inclined rod (82b) that are formed to slope downward from the outer side of the guide hole (81) toward the center. Accordingly, the support member (82) may be formed with the lowest longitudinally central portion, and an inner hole (83) may be formed in the longitudinally central portion.

[0106] A lower edge (87) is formed at the center of the length of the support (82), and the lower edge (87) can secure a passage through which the electrolyte is injected by pushing the lower structure downward.

[0107] Fig. 13 is a cross-sectional view showing a guide part according to a third embodiment of the present invention.

[0108] Referring to FIG. 13, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0109] A guide portion (90) is formed in the insulating member, and the guide portion (90) may include a guide rim (95) that surrounds the lower part of the guide hole (91), a support (92) that is positioned at the lower part of the guide hole (91) and partially blocks the guide hole (91), and an internal hole (93) that is formed in the support (92) and moves a fluid.

[0110] The guide rim (95) may be formed in the shape of a circular ring or a square ring, and the support member (92) may include a first inclined bar (92a) and a second inclined bar (92b) that are formed to slope downward from the outer side of the guide hole (91) toward the center. Accordingly, the support member (92) may be formed with the lowest longitudinally central portion, and an inner hole (93) may be formed in the longitudinally central portion.

[0111] The inner hole (93) is formed so that the diameter (D5) gradually increases as it goes downward, and accordingly, the movement speed of the electrolyte in the inner hole (93) can be reduced, and when the movement speed of the electrolyte is reduced, deformation of the upper part of the separator due to impact of the electrolyte can be prevented or suppressed.

[0112] Fig. 14 is a perspective view illustrating a guide part according to a fourth embodiment of the present invention, and Fig. 15 is a cross-sectional view illustrating a guide part according to a fourth embodiment of the present invention.

[0113] Referring to FIGS. 14 and 15, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0114] A guide portion (150) is formed in the insulating member, and the guide portion (150) may include a guide rim (155) that surrounds the lower part of the guide hole (151), a support (152) that is positioned at the lower part of the guide hole (151) and partially blocks the guide hole (151), and an internal hole (153) that is formed in the support (152) and moves a fluid.

[0115] The guide rim (155) may be formed in the shape of a circular ring or a square ring, and the support member (152) may extend in the diametric direction of the guide hole (151). In addition, an inner hole (153) may be formed in the longitudinal central portion of the support member (152).

[0116] A wedge portion (157) whose cross-sectional area gradually decreases as it goes downward may be formed at the lower portion of the support (152). In addition, at least one shock-absorbing bar (154) extending in the diametric direction of the inner hole (153) may be formed in the inner hole (153), and a plurality of shock-absorbing bars (154) may be formed to intersect each other in the inner hole (153). The shock-absorbing bar (154) may be fixed to the lower portion of the inner hole (153).

[0117] Below, a secondary battery according to a fifth embodiment of the present invention is described.

[0118] FIG. 16 is a perspective view from above of an insulating member of a secondary battery according to the tenth embodiment of the present invention, FIG. 17 is a longitudinal cross-sectional view of a secondary battery according to the tenth embodiment of the present invention, and FIG. 18 is an enlarged view of A1 in FIG. 22.

[0119] Referring to FIGS. 16 to 18, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member (50) and the cap plate (21), so a duplicate description of the same configuration is omitted.

[0120] Two terminal holes (21c) are formed in the cap plate (21), and a current collector (41, 42) and a gasket (25, 26) can be inserted into the terminal holes (21c). However, the present invention is not limited thereto, and terminals (23, 24), connecting rivets, etc. can also be inserted into the terminal holes (21c).

[0121] A coupling protrusion (21a) protruding toward an insulating member (50) is formed on the lower surface of the cap plate (21), and the coupling protrusion (21a) can be inserted into the insulating member (50). The coupling protrusion (21a) can be formed to surround a terminal hole (21c). Meanwhile, a lower groove (21b) into which a gasket (25, 26) and an insulating member (50) are inserted can be formed on the inner side of the coupling protrusion (21a).

[0122] Meanwhile, an insulating member (50) is installed between the cap plate (21) and the electrode assembly (10) to insulate the cap plate (21) and the electrode assembly (10). A first hole (61) and a second hole (62) into which gaskets (25, 26) are inserted, respectively, may be formed in the insulating member (50).

[0123] The insulating member (50) may include a base plate (51) in the shape of a square plate and two support protrusions (52) protruding downward toward the case (30) from both longitudinal edges (y-axis direction) of the base plate (51). A side groove (59) may be formed on the outer upper portion of the support protrusions (52).

[0124] A coupling groove (57) into which a coupling projection (21a) is inserted can be formed on the upper surface of the insulating member (50) facing the cap plate (21). Accordingly, when the coupling projection (21a) and the coupling groove (57) are fitted together, the insulating member (50) can be stably supported on the cap plate (21) without moving.

[0125] A sealing rim (58) may be formed on the inside of the joining groove (57) so as to protrude toward the cap plate (21) and be inserted into the lower groove (21b). The sealing rim (58) may be formed to surround the first hole (61) or the second hole (62). The sealing rim (58) is inserted into the lower groove (21b) together with the gasket (25, 26) to seal the terminal hole (21c) of the cap plate (21) and prevent movement of the gasket (25, 26).

[0126] When the length of the insulating member (50) is DL1 and the width of the insulating member (50) is DW1, 8DW1≤DL1≤15DW1 can be satisfied. At this time, the length (DL1) of the insulating member (50) can be 190 mm to 310 mm, and the width (DW1) of the insulating member (50) can be 18 mm to 82 mm. When the length (DL1) and width (DW1) of the insulating member (50) satisfy 8DW1≤DL1≤15DW1, the insulating member (50) can stably insulate the cap plate (21) and the electrode assembly (10) while allowing easy injection of the electrolyte.

[0127] In addition, when the thickness of the insulating member (50) is DT1 and the thickness of the cap plate (21) is CT1, 0.4CT1≤DT1≤0.9CT1 can be satisfied. At this time, the thickness (DT1) of the insulating member (50) can be 0.9 mm to 1.8 mm, and the thickness (CT1) of the cap plate (21) can be 1.5 mm to 3.5 mm. In addition, the width (DW1) of the insulating member (50) can be 17 to 29 times the thickness (DT1) of the insulating member (50).

[0128] When the thickness (DT1) of the insulating member (50) and the thickness (CT1) of the cap plate (21) satisfy 0.4CT1≤DT1≤0.9CT1, the insulating member (50) is stably bonded to the cap plate (21), so that the insulating member (50) can guide the injection of the electrolyte while performing stable insulation.

[0129] In addition, according to the present embodiment, a lower groove (21b) and a sealing rim (58) are formed so that the insulating member (50) is more stably connected to the cap plate (21) and does not shake, the terminal hole (21c) is reliably sealed, and movement of the gasket (25, 26) can be prevented.

[0130] Below, a secondary battery according to the sixth embodiment of the present invention is described.

[0131] Fig. 19 is a cross-sectional view showing a guide part according to the sixth embodiment of the present invention.

[0132] Referring to FIG. 19, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0133] A guide portion (160) is formed in the insulating member, and the guide portion (160) may include a guide rim (165) that surrounds the lower part of the guide hole (161), a support (162) that is positioned at the lower part of the guide hole (161) and partially blocks the guide hole (161), and an internal hole (163) that is formed in the support (162) and moves a fluid.

[0134] The guide rim (165) may be formed as a circular ring, the support (162) may extend in the diametric direction of the guide hole (161), and an inner hole (163) may be formed in the longitudinal central portion of the support (162).

[0135] The inner hole (163) has one inlet (163a) and multiple outlets (163b), and the inner hole (163) may have two outlets (163b). In addition, the inner hole (163) may include an upper passage (166) extending inward from the upper surface and two lower passages (167) inclined with respect to the upper passage (166).

[0136] As described above, according to this embodiment, since one passage in the inner hole (163) branches into multiple passages and is injected in various directions, not only can the electrolyte be stably injected, but also the electrolyte injection speed is reduced, so that deformation of the separator due to the electrolyte can be prevented or suppressed.

[0137] Below, a secondary battery according to the seventh embodiment of the present invention is described.

[0138] Fig. 20 is a cross-sectional view showing a guide part according to the seventh embodiment of the present invention.

[0139] Referring to FIG. 20, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0140] A guide portion (120) is formed in the insulating member, and the guide portion (120) may include a guide rim (125) that surrounds the lower part of the guide hole (121), a support (122) that is positioned at the lower part of the guide hole (121) and partially blocks the guide hole (121), and an internal hole (123) that is formed in the support (122) and moves a fluid.

[0141] The guide rim (125) may be formed in a ring shape, the support (122) may extend in the diametric direction of the guide hole (121), and an inner hole (123) may be formed in the longitudinal central portion of the support (122).

[0142] A plurality of auxiliary holes (126) are formed in the guide rim (125), and the auxiliary holes (126) can be arranged along the circumferential direction of the guide rim (125). When the auxiliary holes (126) are formed as in the present embodiment, even when the movement of the electrolyte through the lower part of the guide rim (125) is not smooth, the electrolyte moves through the auxiliary holes (126), thereby preventing or suppressing the backflow of the electrolyte.

[0143] Below, a secondary battery according to the eighth embodiment of the present invention is described.

[0144] Fig. 21 is a perspective view illustrating an exhaust part of an insulating member according to the eighth embodiment of the present invention, and Fig. 22 is a cross-sectional view illustrating an exhaust part of an insulating member according to the eighth embodiment of the present invention.

[0145] Referring to FIGS. 21 and 22, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0146] The exhaust section (130) may include a support frame (135) that protrudes downward and has a ring shape, and a plurality of dividing bars (134) that are fixed to the support frame (135) and extend in the width direction (x-axis direction) of the insulating member. A first exhaust opening (131) may be formed at the center of the exhaust section (130), and a second exhaust opening (132) and a third exhaust opening (133) may be formed on both sides of the first exhaust opening (131).

[0147] A plurality of peripheral holes (136) are formed in the support frame (135), and the peripheral holes (136) can be arranged in the peripheral direction of the frame (135). The first discharge opening (131), the second discharge opening (132), and the third discharge opening (133) can be formed so that their cross-sectional areas gradually increase as they go upward.

[0148] When a peripheral hole (136) is formed in the support frame (135) as in this embodiment, when gas is discharged, a discharge flow directed laterally can be formed in addition to an upward flow, thereby reducing the speed of the flow directed toward the upper part of the case and preventing or suppressing substances such as electrolyte contained inside from being discharged through the vent hole.

[0149] Additionally, as the cross-sectional area of ​​the exhaust openings increases toward the top, the rate of gas discharge can be reduced, thereby preventing or suppressing damage to parts, etc. due to gas discharge.

[0150] Below, a secondary battery according to the ninth embodiment of the present invention is described.

[0151] Fig. 23 is a cross-sectional view showing an exhaust section of an insulating member according to the ninth embodiment of the present invention.

[0152] Referring to FIG. 23, the secondary battery according to the present embodiment has the same structure as the secondary battery according to the first embodiment described above except for the insulating member, so a duplicate description of the same configuration is omitted.

[0153] The exhaust section (140) may include a support frame (145) that protrudes downward and has a ring shape, a porous plate (141) formed on the bottom, and a plurality of exhaust openings (142, 143).

[0154] A porous plate (141) is arranged at the center of the bottom of the exhaust section (140), and exhaust openings (142, 143) can be formed on both sides of the porous plate (141). The porous plate (141) is arranged between the exhaust openings (142, 143), and a plurality of holes (141a) can be formed in the porous plate (141).

[0155] As in this embodiment, when a porous plate (141) is positioned at the center of the exhaust section (140) and discharge openings (142, 143) are formed on both sides, it is possible to prevent or suppress a large amount of foreign substances from being ejected through the center of the exhaust section (140), and even when the porous plate (141) is blocked, a gas discharge passage can be stably secured.

[0156] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

Claims

1. An electrode assembly having a positive electrode and a negative electrode; A case into which the above electrode assembly is inserted; a cap plate coupled to the above case; and An insulating member disposed between the cap plate and the electrode assembly; Including, A secondary battery, wherein the insulating member includes a guide hole positioned at the bottom of the electrolyte injection port formed in the cap plate and a guide portion protruding downward from the guide hole to assist the movement of the electrolyte.

2. In paragraph 1, A secondary battery, wherein the guide portion includes a support member positioned at the lower portion of the guide hole and partially blocking the guide hole, and an internal hole formed in the support member and configured to move a fluid.

3. In paragraph 2, A secondary battery, wherein the inner hole faces the electrolyte injection port.

4. In paragraph 2, A secondary battery, wherein the inner hole is located at the center of the length of the guide portion.

5. In paragraph 2, A secondary battery, wherein the guide portion further includes a guide rim surrounding the lower portion of the guide hole, and the support is fixed to the guide rim.

6. In paragraph 5, A secondary battery, wherein the guide portion further includes a first opening and a second opening formed between a side end of the support and an inner wall of the guide rim.

7. In paragraph 2, A secondary battery, wherein the width of the support is approximately 0.2 to 0.6 times the diameter of the guide hole.

8. In paragraph 2, A secondary battery, wherein the diameter of the inner hole is formed smaller than the diameter of the electrolyte injection port, and the inner hole is located within a lower region corresponding to the electrolyte injection port.

9. In paragraph 2, A secondary battery in which the width of the support is formed larger than the diameter of the electrolyte injection port.

10. In paragraph 2, A secondary battery, wherein the support includes a first inclined rod and a second inclined rod formed to slope downward from the outer side of the guide hole toward the center.

11. In paragraph 2, A secondary battery in which the inner hole is formed so that its diameter gradually increases toward the bottom.

12. In paragraph 2, A secondary battery, wherein the support includes a wedge portion whose cross-sectional area gradually decreases toward the bottom.

13. In paragraph 12, A secondary battery, wherein a shock-absorbing bar extending in the diameter direction of the inner hole is formed in the inner hole.

14. In paragraph 2, A secondary battery, wherein the inner hole has one inlet and multiple outlets.

15. In paragraph 2, A secondary battery, wherein the inner hole includes an upper passage extending inward from the upper surface and a plurality of lower passages inclined with respect to the upper passage.

16. In paragraph 5, A secondary battery in which a plurality of auxiliary holes are formed in the above guide rim, and the auxiliary holes are arranged along the circumferential direction of the above guide rim.

17. In paragraph 1, A vent hole for gas discharge is formed in the above cap plate, The above insulating member includes an exhaust portion protruding toward the bottom of the case and having a plurality of exhaust openings, A secondary battery, wherein the exhaust portion is located at the lower portion of the vent hole.

18. In paragraph 17, A secondary battery, wherein the above discharge guide supports a blocking bar, and includes a support frame having a ring shape and a plurality of blocking bars fixed to the support frame and extending in the width direction of the insulating member.

19. In paragraph 17, A secondary battery, wherein the above discharge opening is formed such that the cross-sectional area gradually increases as it goes toward the cap plate.

20. In paragraph 17, A secondary battery, wherein a porous plate is arranged on the bottom of the exhaust section, and the porous plate is positioned between the exhaust openings.

21. In paragraph 1, A secondary battery, wherein the cap plate has a terminal hole into which a terminal electrically connected to the electrode assembly is inserted, and a coupling protrusion protruding toward the insulating member and surrounding the terminal hole, and a coupling groove into which the coupling protrusion is inserted is formed in the insulating member.

22. In paragraph 21, A secondary battery, wherein a lower groove into which a gasket and the insulating member are inserted is formed on the inner side of the coupling protrusion in the cap plate, and a sealing rim is formed on the inner side of the coupling groove in the insulating member to be inserted into the lower groove.

23. In paragraph 1, A secondary battery that satisfies 8DW1≤DL1≤15DW1, where the length of the insulating member is DL1 and the width of the insulating member is DW1.

24. In paragraph 23, A secondary battery wherein the length of the insulating member is 190 mm to 310 mm and the width of the insulating member is 18 mm to 82 mm.

25. In paragraph 1, A secondary battery that satisfies 0.4CT1≤DT1≤0.9CT1, where the thickness of the insulating material is DT1 and the thickness of the cap plate is CT1.

26. In paragraph 25, A secondary battery wherein the thickness of the insulating material is 0.9 mm to 1.8 mm, and the thickness of the cap plate is 1.5 mm to 3.5 mm.