Secondary battery
By setting guide holes and guide structures for insulating components under the cover of the lithium secondary battery, the blockage problem during electrolyte injection is solved, and stable electrolyte injection and supply are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-31
AI Technical Summary
Existing lithium secondary batteries are prone to blockage by foreign objects during electrolyte injection, leading to reduced injection rate and backflow problems.
An insulating component is provided below the cover plate, including a guide hole and a guide member. The guide member has a structure of a guide hole, an inner hole and a support member. The inner hole is located below the guide hole to facilitate electrolyte flow, and the support member and the inner hole design prevent clogging.
This ensures smooth electrolyte injection, prevents the injection hole from being blocked by the lower structure, guarantees a stable electrolyte supply, and avoids backflow.
Smart Images
Figure CN122498056A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to rechargeable secondary batteries. Background Technology
[0002] Recently, with the rapid increase in demand for portable electronic products such as laptops, video cameras and mobile phones, and with the accelerated development of electric vehicles, energy storage batteries, robots and satellites, research on high-performance rechargeable and rechargeable batteries is actively underway.
[0003] Currently, commercially available rechargeable batteries include, for example, nickel-cadmium (NiCd), nickel-metal hydride (NiMH), nickel-zinc (NiZn), and lithium-ion batteries. Among these, lithium-ion batteries have gained considerable attention compared to nickel-based batteries due to their advantages, including significantly lower memory effect allowing for greater freedom in charging and discharging, very low self-discharge rate, and high energy density.
[0004] Lithium-ion secondary batteries primarily use lithium-based oxides and carbon materials as positive and negative electrode active materials, respectively. Furthermore, a lithium-ion secondary battery includes: a positive electrode plate and a negative electrode plate, each coated with a negative electrode active material; an electrode assembly in which the positive and negative electrode plates are arranged as separators and inserted between them; and a housing for sealingly housing the electrode assembly together with the electrolyte.
[0005] Based on the shape of the battery case, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode components are housed in a metal can, and bag-type secondary batteries in which the electrode components are housed in a pouch made of aluminum laminated sheets. Based on the shape of the metal can, can-type secondary batteries can be further classified into cylindrical batteries and prismatic batteries.
[0006] Prismatic batteries are equipped with electrolyte injection holes, and when these holes are blocked by foreign objects or internal components, problems such as reduced electrolyte injection rate and electrolyte backflow may occur. Summary of the Invention Technical issues
[0007] This disclosure provides a secondary battery into which an electrolyte can be easily injected. Technical solution
[0008] According to one aspect of this disclosure, a secondary battery includes: an electrode assembly having a positive electrode and a negative electrode; a housing into which the electrode assembly is inserted; a cover plate coupled to the housing; and an insulating member disposed between the cover plate and the electrode assembly, wherein the insulating member may include a guide hole located below an electrolyte injection hole formed in the cover plate and a guide protruding downward from the guide hole to facilitate the movement of the electrolyte.
[0009] In embodiments of this disclosure, the guide may include a support disposed below the guide hole to partially block the guide hole and an inner hole formed in the support to allow fluid to move through the inner hole.
[0010] In embodiments of this disclosure, the inner bore may face the electrolyte injection port.
[0011] In embodiments of this disclosure, the inner hole may be located at the longitudinal center of the guide.
[0012] In embodiments of this disclosure, the guide may further include a guide edge surrounding the lower portion of the guide hole, and the support is fixed to the guide edge.
[0013] In embodiments of this disclosure, the guide may further include a first opening and a second opening formed between the lateral end of the support and the inner wall of the guide edge.
[0014] In embodiments of this disclosure, the width of the support member may be approximately 0.2 to 0.6 times the diameter of the guide hole.
[0015] In embodiments of this disclosure, the diameter of the inner hole may be smaller than the diameter of the electrolyte injection hole, and the inner hole may be located in the lower region corresponding to the electrolyte injection hole.
[0016] In embodiments of this disclosure, the width of the support member may be formed to be greater than the diameter of the electrolyte injection hole.
[0017] In embodiments of this disclosure, the support member may include a first tilting rod and a second tilting rod, the first tilting rod and the second tilting rod being formed to tilt downward from the outer periphery of the guide hole toward the center of the guide hole.
[0018] In embodiments of this disclosure, the inner hole can be formed such that the diameter of the inner hole gradually increases downward.
[0019] In embodiments of this disclosure, the support member may include a wedge-shaped portion whose cross-sectional area gradually decreases downward.
[0020] In embodiments of this disclosure, the impact-absorbing rod may be formed in the inner hole to extend along the diametrical direction of the inner hole.
[0021] In embodiments of this disclosure, the inner bore may include an inlet and multiple outlets.
[0022] In embodiments of this disclosure, the inner bore may include an upper channel extending inward from the upper surface of the inner bore and a plurality of lower channels inclined relative to the upper channel.
[0023] In embodiments of this disclosure, a plurality of auxiliary holes may be formed on the guide edge to be arranged along the circumferential direction of the guide edge.
[0024] In embodiments of this disclosure, a vent hole may be formed in the cover plate to discharge gas, and the insulating member may include an exhaust portion protruding toward the bottom of the box and including a plurality of exhaust openings, and the exhaust portion may be disposed below the vent hole.
[0025] In embodiments of this disclosure, the venting portion may include a downwardly projecting support frame in an annular shape and a plurality of blocking rods fixed to the support frame and extending along the width direction of the insulating member.
[0026] In embodiments of this disclosure, each of the plurality of discharge openings may be configured such that the cross-sectional area of each discharge opening gradually increases toward the cover plate.
[0027] In embodiments of this disclosure, a perforated plate may be disposed at the bottom of the exhaust section, and the perforated plate may be disposed between multiple exhaust openings.
[0028] In embodiments of this disclosure, a terminal hole may be formed in the cover plate, into which a terminal electrically connected to the electrode assembly is inserted, and a connecting protrusion may be formed to protrude toward and surround the terminal hole towards the insulating member. A connecting groove may be formed in the insulating member, into which the connecting protrusion is inserted.
[0029] In embodiments of this disclosure, a lower groove may be formed on the inner side of the connecting protrusion of the cover plate, into which a gasket and an insulating member are inserted, and on the inner side of the connecting groove of the insulating member, a sealing edge may be formed to be inserted into the lower groove.
[0030] In the embodiments of this disclosure, when the length of the insulating member is DL1 and the width of the insulating member is DW1, it can satisfy 8DW1≤DL1≤15DW1.
[0031] In embodiments of this disclosure, the length of the insulating member can be from 190 mm to 310 mm, and the width of the insulating member can be from 18 mm to 82 mm.
[0032] In embodiments of this disclosure, when the thickness of the insulating member is DT1 and the thickness of the cover plate is CT1, the condition 0.4CT1≤DT1≤0.9CT1 can be satisfied.
[0033] In embodiments of this disclosure, the thickness of the insulating member can be from 0.9 mm to 1.8 mm, and the thickness of the cover plate can be from 1.5 mm to 3.5 mm. Beneficial effects
[0034] In the secondary battery according to an embodiment of the present disclosure, a guide for electrolyte injection is provided in an insulating member disposed below the cover plate, so that the electrolyte can be easily injected. Attached Figure Description
[0035] The accompanying drawings are merely illustrative of embodiments of the present disclosure and, together with the description herein, serve to further facilitate understanding of the technical concept of the present disclosure. Therefore, the present disclosure should not be construed as limited to the contents illustrated in the drawings.
[0036] Figure 1 This is a perspective view of a secondary battery according to a first embodiment of the present disclosure.
[0037] Figure 2 It's a diagram. Figure 1 A 3D view showing a portion of the secondary battery being disassembled.
[0038] Figure 3 It is along Figure 1 The cross-sectional view taken from line Ⅲ-Ⅲ in the diagram.
[0039] Figure 4 This is a plan view of a secondary battery according to a first embodiment of the present disclosure.
[0040] Figure 5 This is a perspective view of the insulating member of the secondary battery according to the first embodiment of the present disclosure, as viewed from above.
[0041] Figure 6 This is a perspective view of the insulating member of the secondary battery according to the first embodiment of the present disclosure, as viewed from below.
[0042] Figure 7 This is a bottom view of the insulating member of the secondary battery according to the first embodiment of the present disclosure when viewed from below.
[0043] Figure 8 The illustration shows a partial cross-sectional view of the cover plate and insulating member according to a first embodiment of the present disclosure.
[0044] Figure 9 This is a perspective cross-sectional view of the guide member of the insulating member according to the first embodiment of the present disclosure.
[0045] Figure 10 This is a cross-sectional view of the venting portion of an insulating member according to a first embodiment of the present disclosure.
[0046] Figure 11 This is a cross-sectional view of a guide member according to a second embodiment of the present disclosure.
[0047] Figure 12This is a perspective view of a support member according to a second embodiment of the present disclosure.
[0048] Figure 13 This is a cross-sectional view of a guide member according to a third embodiment of the present disclosure.
[0049] Figure 14 This is a cross-sectional view of the guide member according to the fourth embodiment of the present disclosure.
[0050] Figure 15 This is a perspective view of a support member according to the fourth embodiment of the present disclosure.
[0051] Figure 16 This is a perspective view of the insulating member of the secondary battery according to the fifth embodiment of this disclosure, as viewed from above.
[0052] Figure 17 This is a longitudinal cross-sectional view of a secondary battery according to the fifth embodiment of the present disclosure.
[0053] Figure 18 It's a diagram. Figure 17 An enlarged view of region A1 in the image.
[0054] Figure 19 This is a cross-sectional view of the guide member according to the sixth embodiment of the present disclosure.
[0055] Figure 20 This is a perspective view illustrating a guide member according to the seventh embodiment of the present disclosure.
[0056] Figure 21 This is a perspective view illustrating the venting portion of the insulating member according to the eighth embodiment of the present disclosure.
[0057] Figure 22 This is a cross-sectional view of the venting portion of the insulating member according to the eighth embodiment of the present disclosure.
[0058] Figure 23 This is a cross-sectional view of the venting portion of the insulating member according to the ninth embodiment of the present disclosure.
[0059] In some of the accompanying drawings, corresponding components will be indicated by the same reference numerals. The drawings presented are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the dimensions of some elements in the drawings may be enlarged relative to other elements to aid in understanding the various embodiments. Furthermore, common but easily understood elements that are useful or necessary in commercially viable embodiments are generally not depicted to minimize obstruction to the demonstration of the various embodiments. Detailed Implementation
[0060] Because this disclosure is subject to various modifications and includes various embodiments, specific embodiments of this disclosure will be described in detail. However, this disclosure is not limited to the specific embodiments, but should be construed as including all modifications, equivalents, or substitutions falling within the technical concept and scope of this disclosure.
[0061] The terminology used below is intended to describe particular embodiments only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, singular expressions include plural expressions. In the following description, terms such as “comprising” and “having” are intended to indicate the presence of features, numbers, steps, operations, components, parts, and combinations thereof described herein, but should not be construed as excluding the presence or possible addition of one or more other features, numbers, steps, operations, components, parts, and combinations thereof.
[0062] In the following description, embodiments of the present disclosure will be illustrated with reference to the accompanying drawings. It should be noted that, wherever possible, the same components are indicated by the same reference numerals in the drawings. Furthermore, detailed descriptions of well-known functions and configurations will be omitted where determined to obscure the essential points of the present disclosure. For the same reason, some components may be enlarged, omitted, or schematically illustrated in the drawings.
[0063] In the following, a secondary battery according to an embodiment of the present disclosure will be described.
[0064] Figure 1 This is a perspective view of a secondary battery according to a first embodiment of the present disclosure. Figure 2 It's a diagram. Figure 1 A 3D view showing a portion of the secondary battery being disassembled. Figure 3 It is along Figure 1 The cross-sectional view taken from line Ⅲ-Ⅲ in the diagram. Figure 4 This is a plan view of a secondary battery according to a first embodiment of the present disclosure.
[0065] Reference Figures 1 to 3 The secondary battery 100 according to this embodiment includes: an electrode assembly 10, which includes a positive electrode 11 and a negative electrode 12; a housing 30, which houses the electrode assembly 10; a cover plate 21, which is connected to the housing 30; terminals 23 and 24, which are disposed on the cover plate 21; and an insulating member 50, which is disposed between the cover plate 21 and the electrode assembly 10.
[0066] The electrode assembly 10 includes a positive electrode 11, a negative electrode 12, and a spacer 13 disposed between the positive electrode 11 and the negative electrode 12. The positive electrode 11, the spacer 13, and the negative electrode 12 can be arranged in a stacked structure or wound in a spiral configuration. Furthermore, the electrode assembly 10 can have a structure in which the positive electrode 11 and the negative electrode 12 are alternately inserted between sheets of the spacer 13, which are bent in a serrated shape. Additionally, the electrode assembly 10 can be manufactured in various forms, such as an all-solid-state type.
[0067] Each of the positive electrode 11 and the negative electrode 12 may include a coated portion and an uncoated portion, the coated portion being an area of the metal foil to which an active material is applied, and the uncoated portion being to which no active material is applied. The uncoated portion 15 of the positive electrode may protrude from a lateral end of the positive electrode 11, and the uncoated portion 16 of the negative electrode may protrude from a lateral end of the negative electrode 12. The uncoated portions 15 and 16 of the positive and negative electrodes may protrude in the same direction, for example, in a direction toward the cover plate 21 (z-axis direction).
[0068] The uncoated positive electrode portion 15 and the uncoated negative electrode portion 16 are formed in a tab shape and can be spaced apart from each other in the width direction (y-axis direction) of the box 30. The uncoated positive electrode portion 15 and the uncoated negative electrode portion 16 can be stacked in the thickness direction (x-axis direction) of the box 30.
[0069] Furthermore, the uncoated portion 15 of the positive electrode can be connected to the first terminal 23 via the current collector 41, and the uncoated portion 16 of the negative electrode can be connected to the second terminal 24 via the current collector 42.
[0070] The separator 13 is disposed between the positive electrode 11 and the negative electrode 12 to prevent or suppress short circuits and allow ion movement. When the secondary battery 100 is an all-solid-state battery, a solid electrolyte, instead of the separator 13, may be disposed between the positive electrode 11 and the negative electrode 12.
[0071] The box 30 can be formed in the shape of a box having an internal space for accommodating the electrode assembly 10. The box 30 can be formed in various shapes, such as prism and cylinder. A single electrode assembly 10 can be inserted into the box 30, or multiple electrode assemblies 10 can be inserted into the box 30.
[0072] The electrolyte can be contained in the housing 10 together with the electrode assembly 10. The electrolyte can be provided in liquid, solid or gel form.
[0073] The cover plate 21 is made of a plate material that covers the opening of the box 30, and may have a shape corresponding to the shape of the opening of the box 30. The cover plate 21 can be fixed to the box 30 by welding.
[0074] An electrolyte injection hole H1 may be formed in the cover plate 21, through which electrolyte is injected, and a vent hole H2 may be formed, in which a venting member 27 is installed. A sealing cap 28 may be provided in the electrolyte injection hole H1 to block the electrolyte injection hole H1, and the venting member 27 in the vent hole H2 may be configured to open under a predetermined internal pressure.
[0075] Terminals 23 and 24 are connected to cover plate 21, and one or both terminals 23 and 24 can be disposed on cover plate 21. When both terminals 23 and 24 are disposed on cover plate 21, the first terminal 23 can be used as the positive terminal, and the second terminal 24 can be used as the negative terminal. When one terminal is disposed on cover plate 21, box 30 can be charged to the negative terminal.
[0076] The first terminal 23 and the second terminal 24 can be formed in a plate shape. A washer 25 for electrical insulation can be disposed between the first terminal 23 and the cover plate 21, and a washer 26 for electrical insulation can be disposed between the second terminal 24 and the cover plate 21. The washers 25 and 26 can extend downwards and also be located between the current collectors 41 and 42 and the cover plate 21. Each of the washers 25 and 26 can be formed as a single component or can be divided into multiple components.
[0077] The first terminal 23 can be electrically connected to the positive uncoated portion 15 via the first current collector 41, and the second terminal 24 can be electrically connected to the negative uncoated portion 16 via the second current collector 42 and the reinforcing member 72.
[0078] The first terminal 23 and the second terminal 24 can be formed in the shape of a plate, and a hole can be formed at the center of each of the first terminal 23 and the second terminal 24, such that the connecting post of the first current collector 41 or the second current collector 42 is inserted into the hole.
[0079] The electrode assembly 10 may include two arrays of uncoated positive electrode portions having the same polarity, and the arrays of uncoated positive electrode portions may be configured not to overlap in the width direction (y-axis direction) and thickness direction (x-axis direction) of the electrode assembly 10.
[0080] In addition, the electrode assembly 10 may include two arrays of uncoated negative electrode portions having the same polarity, and the arrays of uncoated negative electrode portions may be configured not to overlap in the width direction (y-axis direction) and thickness direction (x-axis direction) of the electrode assembly 10.
[0081] The first current collector 41 may include a central portion 41a, a first current collector protrusion 41b protruding from one lateral end of the central portion 41a, a second current collector protrusion 41c protruding from the other lateral end of the central portion, and a connecting post 41d protruding from the central portion toward the cover plate. The first current collector protrusion 41b and the second current collector protrusion 41c may be spaced apart from each other in the length direction (y-axis direction) and thickness direction (x-axis direction) of the electrode assembly.
[0082] The uncoated portion 15 of the positive electrode can be bonded to the first current collector protrusion 41b and the second current collector protrusion 41c, and the array of uncoated portions of the positive electrode can be bent in opposite directions and fixed to the first current collector protrusion 41b or the second current collector protrusion 41c by welding. The uncoated portion 15 of the positive electrode can be bonded to the upper surface of the first current collector protrusion 41b or the second current collector protrusion 41c.
[0083] The connecting post 41d has a cylindrical shape and can be integrally formed with the central portion. However, this disclosure is not limited thereto, and the connecting post can be fixed to the central portion by welding.
[0084] The second current collector 42 may include a central portion 42a, a first current collector protrusion 42b protruding from one lateral end of the central portion 42a, a second current collector protrusion 42c protruding from the other lateral end of the central portion 42a, and a connecting post 42d protruding from the central portion 42a toward the cover plate 21. The first current collector protrusion 42b and the second current collector protrusion 42c may be spaced apart from each other in the length direction (y-axis direction) and thickness direction (x-axis direction) of the electrode assembly 10.
[0085] The uncoated negative electrode portion 16 can be bonded to the first current collector protrusion 42b and the second current collector protrusion 42c, and the array of uncoated negative electrode portions can be bent in opposite directions and fixed to the first current collector protrusion 42b or the second current collector protrusion 42c by welding. The uncoated negative electrode portion 16 can be bonded to the upper surface of the first current collector protrusion 42b or the second current collector protrusion 42c.
[0086] The connecting post 41d of the first current collector 41 can be welded together while inserted into the first terminal 23, and the connecting post 42d of the second current collector 42 can be welded together while inserted into the second terminal 24.
[0087] Figure 5 This is a perspective view of the insulating member of the secondary battery according to the first embodiment of the present disclosure, as viewed from above. Figure 6 This is a perspective view of the insulating member of the secondary battery according to the first embodiment of the present disclosure, as viewed from below. Figure 7 This is a bottom view of the insulating member of the secondary battery according to the first embodiment of the present disclosure when viewed from below. Figure 8 The illustration shows a partial cross-sectional view of the cover plate and insulating member according to a first embodiment of the present disclosure. Figure 9 This is a perspective cross-sectional view of the guide member of the insulating member according to the first embodiment of the present disclosure.
[0088] Reference Figures 5 to 9 An insulating member 50 is disposed between the cover plate 21 and the electrode assembly 10 to electrically insulate the cover plate 21 and the electrode assembly 10. The insulating member 50 may have a shape corresponding to the cover plate 21, and may be formed into an elongated square plate shape. The insulating member 50 may be positioned facing the cover plate 21, and may be positioned parallel to the cover plate 21.
[0089] The insulating member 50 may include a substrate 51 having a square plate shape and two support protrusions 52 protruding downward from two ends of the substrate 51 in the longitudinal direction (y-axis direction) toward the box 30.
[0090] In the substrate 51, a first hole 53 may be formed, into which the lower end of the washer 25 of the first terminal 23 is inserted, and a second hole 54 may be formed, into which the lower end of the washer 26 of the second terminal 24 is inserted.
[0091] Furthermore, the insulating member 50 may include a guide hole 71 located below the electrolyte injection hole H1, a guide member 70 protruding downward from the guide hole 71, and an exhaust portion 55 disposed below the vent hole H2. Figure 5 In the middle, the downward-protruding guide 70 is represented by a dashed line.
[0092] The guide member 70, protruding downward from the guide hole 71, may include a guide edge 75 surrounding a lower portion of the guide hole 71, a support member 72 disposed below the guide hole 71 to partially block the guide hole 71, and an inner hole 73 formed in the support member 72 to allow fluid movement through the inner hole 73. According to an embodiment, the guide edge 75 may be formed in a circular ring shape, and the support member 72 may be formed in a straight rod shape. The support member 72 may be fixed to the lower end of the guide edge 75 and extend along the diametrical direction of the guide hole 71.
[0093] An inner hole 73 is provided at the center of the support member 72 in the longitudinal direction and can be formed to face the electrolyte injection hole H1. The diameter D3 of the inner hole 73 is formed to be smaller than the diameter D1 of the electrolyte injection hole H1, and the inner hole 73 can be located in the lower region corresponding to the electrolyte injection hole H1.
[0094] Meanwhile, the diameter D2 of the guide hole 71 can be formed to be larger than the diameter D1 of the electrolyte injection hole H1. The width W1 of the support member 72 can be about 0.2 to 0.6 times the diameter D2 of the guide hole 71. The width W1 of the support member 72 can be formed to be larger than the diameter D1 of the electrolyte injection hole H1, and can be about 1.1 to 1.5 times the diameter D1 of the electrolyte injection hole H1.
[0095] The first opening 76 and the second opening 78 can be formed between the lateral end of the support member 72 and the inner wall of the guide edge 75, and can open downward while being spaced apart from each other, wherein the support member 72 is disposed between them.
[0096] An insulating member 50 is disposed below the cover plate 21, and the electrolyte is injected into the electrolyte injection hole H1 with the cover plate 21 connected to the housing 30. When the guide member 70, which includes a guide edge 75, a support member 72, and a guide hole 71, is formed in the insulating member 50, the electrolyte injection hole H1 can be prevented or suppressed from being blocked by the lower structure, and the electrolyte can be easily injected.
[0097] Furthermore, since the inner hole 73 is located directly below the electrolyte injection hole H1, the electrolyte can move into the box 30 through the inner hole 73, thereby preventing or suppressing the backflow of the electrolyte. In the event of blockage of the inner hole 73 or a large supply of electrolyte, the electrolyte can be injected into the box through the first opening 76 and the second opening 78 formed on both sides of the support 72.
[0098] Figure 10 This is a cross-sectional view of the venting portion of an insulating member according to a first embodiment of the present disclosure.
[0099] Reference Figure 5 and Figure 10 The exhaust portion 55 is disposed below the vent H2 and includes multiple exhaust openings. The exhaust portion 55 may include a downwardly projecting, annular support frame 56 and multiple stop bars 55d fixed to the support frame 56 and extending along the width direction (x-axis direction) of the insulating member 50. A first exhaust opening 55a may be formed in the center of the exhaust portion 55, and a second exhaust opening 55b and a third exhaust opening 55c may be formed on either side of the first exhaust opening 55a. The first exhaust opening 55a has a larger cross-sectional area than each of the second exhaust opening 55b and the third exhaust opening 55c.
[0100] In this way, when the exhaust section 55 is disposed in the insulating member 50, the venting member 27 can rupture under a predetermined pressure when the pressure inside the box 30 increases, so that the gas inside the box 30 can be easily discharged.
[0101] The secondary battery according to the second embodiment of the present disclosure will be described below.
[0102] Figure 11 The illustration shows a cross-sectional view of the guide member according to the second embodiment of this disclosure, and Figure 12 This is a perspective view of a support member according to a second embodiment of the present disclosure.
[0103] Reference Figure 11 and Figure 12 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0104] The guide 80 may be formed in an insulating member and may include a guide edge 85 surrounding a lower portion of the guide hole 81, a support 82 disposed below the guide hole 81 to partially block the guide hole 81, and an inner hole 83 formed in the support 82 to allow fluid to move through the inner hole 83.
[0105] The guide edge 85 can be formed in a circular or square ring shape, and the support member 82 can include a first inclined rod 82a and a second inclined rod 82b, which are formed to slope downward from the outer periphery of the guide hole 81 toward its center. Therefore, the support member 82 can be formed to be lowest at its longitudinal central portion, and the inner hole 83 can be formed in the longitudinal central portion.
[0106] The bottom edge 87 can be formed at the longitudinal center of the support 82 and can push the lower substructure downward to provide a channel through which electrolyte is injected.
[0107] Figure 13 This is a cross-sectional view of a guide member according to a third embodiment of the present disclosure.
[0108] Reference Figure 13 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0109] The guide 90 may be formed in an insulating member and may include a guide edge 95 surrounding a lower portion of the guide hole 91, a support 92 disposed below the guide hole 91 to partially block the guide hole 91, and an inner hole 93 formed in the support 92 to allow fluid to move through the inner hole 93.
[0110] The guide edge 95 can be formed in a circular or square ring shape, and the support member 92 can include a first inclined rod 92a and a second inclined rod 92b, which are formed to slope downward from the outer periphery of the guide hole 91 toward its center. Therefore, the support member 92 can be formed to be lowest at its longitudinal central portion, and the inner hole 93 can be formed in the longitudinal central portion.
[0111] The inner hole 93 is formed such that its diameter D5 gradually increases downwards, and therefore, the flow rate of the electrolyte in the inner hole 93 can be reduced. When the flow rate of the electrolyte is reduced, deformation of the upper part of the separator caused by the impact of the electrolyte can be prevented or suppressed.
[0112] Figure 14 This is a perspective view illustrating a guide member according to a fourth embodiment of the present disclosure, and Figure 15 This is a cross-sectional view of the guide member according to the fourth embodiment of the present disclosure.
[0113] Reference Figure 14 and Figure 15 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0114] The guide 150 may be formed in an insulating member and may include a guide edge 155 surrounding a lower portion of the guide hole 151, a support 152 disposed below the guide hole 151 to partially block the guide hole 151, and an inner hole 153 formed in the support 152 to allow fluid to move through the inner hole 153.
[0115] The guide edge 155 can be formed in the shape of a circular ring or a square ring, and the support member 152 can extend along the diameter direction of the guide hole 151. The inner hole 153 can be formed in the longitudinal central portion of the support member 152.
[0116] In the lower portion of the support member 152, the wedge-shaped portion 157 may be formed such that its cross-sectional area gradually decreases downward. Furthermore, at least one or more impact-absorbing rods 154 are formed in the inner hole 153 extending along the diametrical direction of the inner hole 153, and the plurality of impact-absorbing rods 154 may be formed to intersect each other. The impact-absorbing rods 154 may be fixed to the lower end of the inner hole 153.
[0117] The secondary battery according to the fifth embodiment of this disclosure will be described below.
[0118] Figure 16 This is a perspective view of the insulating member of the secondary battery according to the fifth embodiment of the present disclosure when viewed from above. Figure 17 This is a longitudinal cross-sectional view of a secondary battery according to the fifth embodiment of this disclosure. Figure 18 yes Figure 17 An enlarged view of region A1 in the image.
[0119] Reference Figures 16 to 18 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating member 50 and the cover plate 21, the overlapping description of the same structure will be omitted.
[0120] Two terminal holes 21c may be formed in the cover plate 21, and current collectors 41 and 42 and washers 25 and 26 may be inserted into the terminal holes 21c. However, this disclosure is not limited thereto, and for example, terminals 23 and 24 and connecting rivets may be inserted into the terminal holes 21c.
[0121] A connecting protrusion 21a may be formed on the lower surface of the cover plate 21 to protrude toward the insulating member 50, and the connecting protrusion 21a may be inserted into the insulating member 50. The connecting protrusion 21a may be formed to surround the terminal hole 21c. A lower groove 21b may be formed on the inner side of the connecting protrusion 21a, and a washer 25 or 26 and the insulating member 50 are inserted into the lower groove 21b.
[0122] Meanwhile, an insulating member 50 is disposed between the cover plate 21 and the electrode assembly 10 to electrically insulate the cover plate 21 and the electrode assembly 10. A first hole 61 and a second hole 62 may be formed in the insulating member 50, and washers 25 and 26 are respectively inserted into the first hole 61 and the second hole 62.
[0123] The insulating member 50 may include a substrate 51 having a square plate shape and two support protrusions 52 protruding downward from two ends of the substrate 51 in the longitudinal direction (y-axis direction) toward the housing 30. Side grooves 59 may be formed in the outer upper side of each support protrusion 52.
[0124] In the upper surface of the insulating member 50 facing the cover plate 21, the connecting groove 57 can be formed such that the connecting protrusion 21a is inserted therein. Therefore, when the connecting protrusion 21a is fitted into and connected to the connecting groove 57, the insulating member 50 can be stably supported on the cover plate 21 without moving.
[0125] A sealing edge 58 may be formed on the inner side of the connecting groove 57 to protrude toward the cover plate 21 and insert into the lower groove 21b. The sealing edge 58 may be formed to surround the first hole 61 or the second hole 62. The sealing edge 58 may be inserted into the lower groove 21b together with the gasket 25 or 26 to seal the terminal hole 21c of the cover plate 21 and prevent movement of the gasket 25 or 26.
[0126] When the length of the insulating member 50 is DL1 and the width of the insulating member 50 is DW1, the condition 8DW1≤DL1≤15DW1 can be met. In this case, the length DL1 of the insulating member 50 can be from 190 mm to 310 mm, and the width DW1 of the insulating member 50 can be from 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 cover plate 21 and the electrode assembly 10, and the electrolyte can be easily injected.
[0127] Furthermore, when the thickness of the insulating member 50 is DT1 and the thickness of the cover plate 21 is CT1, the condition 0.4CT1≤DT1≤0.9CT1 can be met. In this case, the thickness DT1 of the insulating member 50 can be from 0.9 mm to 1.8 mm, and the thickness CT1 of the cover plate 21 can be from 1.5 mm to 3.5 mm. Additionally, 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 cover plate 21 satisfy 0.4CT1≤DT1≤0.9CT1, the insulating member 50 is stably connected to the cover plate 21, so that the insulating member 50 can guide the injection of electrolyte and perform stable insulation at the same time.
[0129] According to this embodiment, the lower groove 21b and the sealing edge 58 are formed such that the insulating member 50 can be more stably connected to the cover plate 21 without wobbling, the terminal hole 21c can be reliably sealed, and the movement of the washers 25 and 26 can be prevented.
[0130] The secondary battery according to the sixth embodiment of this disclosure will be described below.
[0131] Figure 19 This is a cross-sectional view of the guide member according to the sixth embodiment of the present disclosure.
[0132] Reference Figure 19 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0133] The guide 160 may be formed in an insulating member and may include a guide edge 165 surrounding a lower portion of the guide hole 161, a support 162 disposed below the guide hole 161 to partially block the guide hole 161, and an inner hole 163 formed in the support 162 to allow fluid to move through the inner hole 163.
[0134] The guide edge 165 can be formed in the shape of a circular ring, the support member 162 can extend along the diameter direction of the guide hole 161, and the inner hole 163 can be formed in the longitudinal central portion of the support member 162.
[0135] The inner bore 163 includes an inlet 163a and a plurality of outlets 163b, and may include two outlets 163b. In addition, the inner bore 163 may include an upper channel 166 extending inward from its upper surface and two lower channels 167 inclined relative to the upper channel 166.
[0136] As described above, according to this embodiment, in the inner hole 163, one channel branches into multiple channels, allowing the electrolyte to be injected in various directions. Therefore, the electrolyte can be injected stably, and the injection rate is reduced, which can prevent or suppress deformation of the separator caused by the electrolyte.
[0137] The secondary battery according to the seventh embodiment of this disclosure will be described below.
[0138] Figure 20 This is a cross-sectional view of the guide member according to the seventh embodiment of the present disclosure.
[0139] Reference Figure 20 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0140] The guide 120 may be formed in an insulating member and may include a guide edge 125 surrounding a lower portion of the guide hole 121, a support 122 disposed below the guide hole 121 to partially block the guide hole 121, and an inner hole 123 formed in the support 122 to allow fluid to move through the inner hole 123.
[0141] The guide edge 125 can be formed in an annular shape, the support member 122 can extend along the diameter direction of the guide hole 121, and the inner hole 123 can be formed in the longitudinal central portion of the support member 122.
[0142] Multiple auxiliary holes 126 can be formed in the guide edge 125 and can be arranged along the circumferential direction of the guide edge 125. When the auxiliary holes 126 are formed as in this embodiment, the electrolyte can move through the auxiliary holes 126 even if the electrolyte cannot move smoothly through the bottom of the guide edge 125, thereby preventing or suppressing the backflow of the electrolyte.
[0143] The eighth embodiment of the secondary battery according to this disclosure will be described below.
[0144] Figure 21This is a perspective view illustrating the venting portion of the insulating member according to the eighth embodiment of the present disclosure, and Figure 22 This is a cross-sectional view of the venting portion of the insulating member according to the eighth embodiment of the present disclosure.
[0145] Reference Figure 21 and Figure 22 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0146] The exhaust portion 130 may include a downwardly projecting support frame 135 in an annular shape and a plurality of blocking rods 134 fixed to the support frame 135 and extending along the width direction (x-axis direction) of the insulating member 50. A first exhaust opening 131 is formed in the center of the exhaust portion 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] Multiple peripheral holes 136 are formed in the support frame 135, and the peripheral holes 136 can be arranged along the periphery of the support frame 135. Each of the first discharge opening 131, the second discharge opening 132, and the third discharge opening 133 can be formed such that its cross-sectional area gradually increases upward.
[0148] When the peripheral hole 136 is formed in the support frame 135 as in this embodiment, during gas discharge, in addition to the upward discharge flow of gas, a lateral discharge flow of gas can also be formed, which can reduce the flow rate directed toward the top of the box and prevent or inhibit the discharge of materials such as electrolytes contained in the box through the vent.
[0149] Furthermore, as the cross-sectional area of each discharge opening increases upwards, the gas emission rate can be reduced, which can prevent or suppress damage to components, etc., caused by gas emissions.
[0150] The secondary battery according to the ninth embodiment of this disclosure will be described below.
[0151] Figure 23 This is a cross-sectional view of the venting portion of the insulating member according to the ninth embodiment of the present disclosure.
[0152] Reference Figure 23 Since the secondary battery according to this embodiment has the same structure as the secondary battery according to the first embodiment described above, except for the insulating component, the overlapping description of the same structure will be omitted.
[0153] The exhaust section 140 may include a downwardly projecting support frame 145 in an annular shape, a perforated plate 141 formed at its bottom, and a plurality of exhaust openings 142 and 143.
[0154] A perforated plate 141 may be disposed at the center of the bottom of the exhaust section 140, and exhaust openings 142 and 143 may be formed on both sides of the perforated plate 141. The perforated plate 141 may be disposed between the exhaust openings 142 and 143, and a plurality of holes 141a may be formed in the perforated plate 141.
[0155] When the perforated plate 141 is disposed in the center of the exhaust section 140 as in this embodiment, and the exhaust openings 142 and 143 are formed on both sides of the perforated plate 141, a large amount of foreign matter can be prevented or suppressed from being ejected through the center of the exhaust section 140, and the gas exhaust passage can be reliably ensured even when the perforated plate 141 is blocked.
[0156] Although embodiments of this disclosure have been described, those skilled in the art can make various modifications and alterations to this disclosure by adding, changing, deleting or adding components without departing from the concept set forth in the claims, and such modifications and alterations also fall within the scope of this disclosure.
Claims
1. A secondary battery, comprising: An electrode assembly having a positive electrode and a negative electrode; The electrode assembly is inserted into the housing; A cover plate, the cover plate being connected to the box; as well as An insulating component is disposed between the cover plate and the electrode assembly; The insulating member includes a guide hole located below the electrolyte injection hole formed in the cover plate and a guide protruding downward from the guide hole to facilitate the movement of the electrolyte.
2. The secondary battery according to claim 1, wherein The guide includes a support disposed below the guide hole to partially block the guide hole and an inner hole formed in the support to allow fluid to move through the inner hole.
3. The secondary battery according to claim 2, wherein The inner hole faces the electrolyte injection hole.
4. The secondary battery according to claim 2, wherein The inner hole is located at the longitudinal center of the guide.
5. The secondary battery according to claim 2, wherein The guide also includes a guide edge surrounding the lower portion of the guide hole, and the support is fixed to the guide edge.
6. The secondary battery according to claim 5, wherein The guide also includes a first opening and a second opening formed between the lateral end of the support and the inner wall of the guide edge.
7. The secondary battery according to claim 2, wherein The width of the support member is approximately 0.2 to 0.6 times the diameter of the guide hole.
8. The secondary battery according to claim 2, wherein The diameter of the inner hole is smaller than the diameter of the electrolyte injection hole, and the inner hole is located in the lower region corresponding to the electrolyte injection hole.
9. The secondary battery according to claim 2, wherein The width of the support member is larger than the diameter of the electrolyte injection hole.
10. The secondary battery according to claim 2, wherein, The support member includes a first tilting rod and a second tilting rod, which are formed to tilt downward from the outer periphery of the guide hole toward the center of the guide hole.
11. The secondary battery according to claim 2, wherein, The inner hole is formed such that its diameter gradually increases downwards.
12. The secondary battery according to claim 2, wherein, The support member includes a wedge-shaped portion, the cross-sectional area of which gradually decreases downwards.
13. The secondary battery according to claim 12, wherein, An impact-absorbing rod is formed in the inner hole and extends along the diameter of the inner hole.
14. The secondary battery according to claim 2, wherein, The inner bore includes an inlet and multiple outlets.
15. The secondary battery according to claim 2, wherein, The inner bore includes an upper channel extending inward from the upper surface of the inner bore and a plurality of lower channels inclined relative to the upper channel.
16. The secondary battery according to claim 5, wherein, Multiple auxiliary holes are formed in the guide edge and arranged along the circumferential direction of the guide edge.
17. The secondary battery according to claim 1, wherein, Vent holes are formed in the cover plate to release gas. The insulating member includes an exhaust portion that protrudes toward the bottom of the box and includes multiple exhaust openings, and The exhaust section is located below the vent.
18. The secondary battery according to claim 17, wherein, The exhaust section includes a downwardly projecting support frame in an annular shape and a plurality of blocking rods fixed to the support frame and extending along the width direction of the insulating member.
19. The secondary battery according to claim 17, wherein, Each of the plurality of discharge openings is formed such that the cross-sectional area of each discharge opening gradually increases toward the cover plate.
20. The secondary battery according to claim 17, wherein, A perforated plate is disposed at the bottom of the exhaust section and between the plurality of exhaust openings.
21. The secondary battery according to claim 1, wherein, Terminal holes are formed in the cover plate, and terminals electrically connected to the electrode assembly are inserted into the terminal holes. A connecting protrusion is formed to protrude toward the insulating member and surround the terminal holes. A connecting groove is formed in the insulating member, and the connecting protrusion is inserted into the connecting groove.
22. The secondary battery according to claim 21, wherein, A lower groove is formed on the inner side of the connecting protrusion of the cover plate, and the washer and the insulating member are inserted into the lower groove. On the inner side of the connecting groove of the insulating member, the sealing edge is formed to be inserted into the lower groove.
23. The secondary battery according to claim 1, wherein, When the length of the insulating member is DL1 and the width of the insulating member is DW1, the condition 8DW1≤DL1≤15DW1 is satisfied.
24. The secondary battery according to claim 23, 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. The secondary battery according to claim 1, wherein, When the thickness of the insulating member is DT1 and the thickness of the cover plate is CT1, the condition 0.4CT1≤DT1≤0.9CT1 is satisfied.
26. The secondary battery according to claim 25, wherein, The thickness of the insulating member is 0.9 mm to 1.8 mm, and the thickness of the cover plate is 1.5 mm to 3.5 mm.