Secondary battery

Abstract

The present invention relates to a secondary battery in which an electrically insulating fixing part and an electrically insulating door are integrally manufactured. According to one embodiment, the present invention comprises: a case in which an electrode assembly is accommodated; a cap plate shielding an open entrance of the case; a current collection part electrically connecting a terminal part installed on the cap plate to the electrode assembly; an electrically insulating fixing part installed between the electrode assembly and the cap plate; and an electrically insulating door rotatably installed on the electrically insulating fixing part and fixed to the electrically insulating fixing part with the current collection part interposed therebetween.

Description

secondary batteries

[0001] The present disclosure relates to a secondary battery.

[0002] Secondary batteries, unlike non-rechargeable primary batteries, are rechargeable and dischargeable. Low-capacity secondary batteries are used in small, portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for motor drives and power storage in hybrid and electric vehicles. These secondary batteries include an electrode assembly comprising a positive and negative electrode, a case housing the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] The above-described information disclosed in the background technology of this invention is only intended to improve understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

[0004] The present invention provides a secondary battery in which an insulating door covering a terminal portion and a current collector portion is rotatably installed on an insulator installed between an electrode assembly and a cap plate.

[0005] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0006] According to one embodiment of the present invention for solving the above technical problem, a secondary battery includes a case in which an electrode assembly is accommodated inside, a cap plate for shielding an open entrance of the case, a current collector for electrically connecting a terminal installed on the cap plate and the electrode assembly, an insulating fixing part installed between the electrode assembly and the cap plate, and an insulating door rotatably installed on the insulating fixing part and fixed to the insulating fixing part with the current collector interposed therebetween.

[0007] For example, the insulating fixing member may include an insulating body positioned between the cap plate and the electrode assembly, and a side portion positioned on both sides of the insulating body in the longitudinal direction and on which an insulating door is rotatably installed.

[0008] For example, the insulating door may include a door body that is rotatably connected to a side portion and covers an end of a terminal portion connected to a collector, and a hook in the shape of a ring that extends from the door body and is hung on the side portion.

[0009] For example, the door body may include a guide groove that forms a groove at a position facing the terminal portion.

[0010] For example, the door body may further include a discharge hole that forms holes on both sides of the length of the guide groove and guides the discharge of the electrolyte.

[0011] For example, the hook rotates together with the door body and can be restricted from moving by being caught in a catch groove provided on the side.

[0012] For example, the insulating body may be installed at a position facing a vent hole provided in the cap plate and may include a vent part that is connected to and communicates with the vent hole.

[0013] For example, the vent part may include a vent connection hole installed at a position facing the vent hole and a reinforcing rib installed inside the vent connection hole and dividing the vent connection hole into a plurality of spaces.

[0014] For example, the insulating body may be installed at a position facing the electrolyte injection port provided in the cap plate and may include an injection portion that serves as a supply passage for the electrolyte.

[0015] For example, the injection unit may include a pouring hole portion forming a hole in an insulating body facing an electrolyte injection port, and a stopper extending from the insulating body and positioned inside the pouring hole portion, and changing the direction of falling of the electrolyte falling through the pouring hole portion.

[0016] For example, the injection unit can be installed on both sides of the vent unit in the longitudinal direction.

[0017] For example, the insulating body may further include a transport fixing hole portion that protrudes from the insulating body in a direction toward the electrode assembly and forms a hole into which a transport projection is inserted when the product is transported.

[0018] For example, the insulating body may form a plurality of holes on the side of the transfer fixing hole and further include a guide hole for discharging the electrolyte inside the transfer fixing hole.

[0019] A secondary battery according to one embodiment of the present invention may include an electrode assembly, a current collector electrically connected to the electrode assembly, a terminal electrically connected to the current collector and protruding outward from a cap plate, an insulating fixing member installed between the current collector and the cap plate, and an insulating door rotatably installed on the insulating fixing member and fixed to the insulating fixing member with the current collector interposed therebetween.

[0020] According to the present invention, since the insulating fixing part and the insulating door are manufactured as an integral part, material costs and assembly costs can be reduced.

[0021] Additionally, it is possible to reduce the logistics costs required to move the insulation fixing unit and the insulation door separately.

[0022] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects that are not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0023] The following drawings attached to this specification illustrate preferred 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.

[0024] Figure 1 is a perspective view of a secondary battery according to one embodiment of the present invention.

[0025] Figure 2 is a cross-sectional view of a secondary battery according to one embodiment of the present invention.

[0026] FIG. 3 is a perspective view illustrating an insulating fixing part, an insulating door, and a current collector according to one embodiment of the present invention.

[0027] Figure 4 is a perspective view illustrating a side portion and an insulating door according to one embodiment of the present invention.

[0028] Figures 5 and 6 are perspective views illustrating an insulating fixing part and an insulating door according to one embodiment of the present invention.

[0029] FIG. 7 is a side cross-sectional view showing an insulating door in an open state according to one embodiment of the present invention.

[0030] Figure 8 is a side cross-sectional view showing an insulating door in a closed state according to one embodiment of the present invention.

[0031] Fig. 9 is a cross-sectional view showing an insulating door in a closed state according to one embodiment of the present invention.

[0032] Figure 10 is a bottom view illustrating a vent section and an injection section according to one embodiment of the present invention.

[0033] Fig. 11 is a side cross-sectional view illustrating a state in which an electrolyte is supplied to the inside of an injection portion according to one embodiment of the present invention.

[0034] Fig. 12 is a front view showing a path through which electrolyte is discharged from an insulating fixing unit according to one embodiment of the present invention.

[0035] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as limited to their conventional or dictionary meanings, and should be interpreted with meanings and concepts that conform to the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of a term to best explain his or her own invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as substitutes for them at the time of filing this application.

[0036] Additionally, when used herein, the terms "comprise", "include" and / or "comprising", "including" specify the presence of stated features, numbers, steps, operations, elements, elements and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, elements and / or groups thereof.

[0037] Additionally, to facilitate understanding of the invention, the attached drawings are not drawn to scale and some components may be exaggerated in size. Furthermore, identical components may be assigned the same reference numbers in different embodiments.

[0038] The statement that two compared objects are "identical" means "substantially identical." Therefore, "substantially identical" may include deviations considered low in the art, such as deviations of less than 5%. Furthermore, uniformity of a parameter over a given region may imply uniformity on average.

[0039] Although the terms "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0040] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0041] Any configuration being placed “on top (or bottom)” of a component or “on top (or bottom)” of a component may mean not only that any configuration is placed in contact with the top (or bottom) of the component, but also that other configurations may be interposed between the component and any configuration placed on (or under) the component.

[0042] Additionally, when a component is described as being “on,” “connected to,” or “coupled to” another component, it should be understood that the components may be directly connected or coupled to one another, but that other components may also be “interposed” between the components, or that each component may be “connected,” “coupled,” or “connected” through other components.

[0043] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, the use of "may" when describing embodiments of the present disclosure refers to "one or more embodiments of the present disclosure." Expressions such as "one or more" and "one or more" preceding a list of elements modify the list as a whole and do not modify individual elements in the list.

[0044] When reference is made throughout the specification to “A and / or B,” this means A, B, or A and B, unless otherwise stated, and when reference is made to “C to D,” this means C or more and D or less, unless otherwise stated.

[0045] When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group A, B, and C," or "at least one selected from A, B, and C," are used to specify a list of elements A, B, and C, the phrases can refer to any suitable combination.

[0046] The term "use" may be considered synonymous with the term "utilize." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than degrees, and are intended to take into account inherent variations in measured or calculated values ​​that would be recognized by those skilled in the art.

[0047] Although terms such as first, second, third, etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could also be termed a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0048] For ease of description, spatially relative terms such as "beneath," "below," "lower," "above," "upper," and the like may be used herein to describe the relationship of one element or feature to another element(s) or feature(s) as depicted in the drawings. It will be understood that spatially relative positions encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the drawings is turned over, an element described as "beneath" or "lower" another element would be understood to be "above" or "upper" the other element. Thus, the term "beneath" can encompass both the above and below orientations.

[0049] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to be limiting of the present disclosure.

[0050] A secondary battery (100) according to one embodiment of the present invention will be described with reference to the drawings.

[0051] FIG. 1 is a perspective view of a secondary battery (100) according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a secondary battery (100) according to one embodiment of the present invention, and FIG. 9 is a cross-sectional view illustrating a closed state of an insulating door (300) according to one embodiment of the present invention. As illustrated in FIGS. 1, 2, and 9, a secondary battery (100) according to one embodiment of the present invention includes an electrode assembly (110), a terminal portion (120), a current collector portion (150), an insulating fixing portion (200), and an insulating door (300). In addition, the secondary battery (100) may further include a case (160) and a cap assembly (170).

[0052] The secondary battery (100) can be modified in various ways within the technical concept of forming an insulating fixing part (200) and an insulating door (300) that insulate the current collector (150) coupled to the terminal part (120) as one piece. Since the insulating fixing part (200) and the insulating door (300), which are insulators, are formed as one piece, the costs required for material costs, inventory management, and processing costs are reduced, thereby reducing the production cost.

[0053] The electrode assembly (110) may be formed by winding or stacking a laminate of a first electrode plate (111), a separator (113), and a second electrode plate (112) formed in a thin plate shape or film shape. When the electrode assembly (110) is a rolled laminate, the winding axis may be parallel to the longitudinal direction of the case (160). In addition, the electrode assembly (110) may be a stack type rather than a rolled type, and the shape of the electrode assembly (110) is not limited in the present invention. In addition, the electrode assembly (110) may be a Z-stack electrode assembly (110) in which a positive electrode plate and a negative electrode plate are inserted on both sides of a separator (113) folded in a Z-stack shape. In addition, the electrode assembly (110) can be housed inside the case (160) by stacking one or more electrode assemblies (110) so that their long sides are adjacent to each other, and the number of electrode assemblies (110) is not limited in the present invention. The first electrode plate (111) of the electrode assembly (110) can serve as a cathode, and the second electrode plate (112) can serve as an anode. Of course, the opposite is also possible.

[0054] The first electrode plate (111) can be formed by applying a first electrode active material, such as graphite or carbon, to a first electrode current collector plate formed of a metal foil, such as copper, copper alloy, nickel, or nickel alloy. The first electrode tab (111a) provided on the first electrode plate (111) is electrically connected to the first current collector (152) among the current collectors (150).

[0055] The second electrode plate (112) may be formed by coating a second electrode active material such as a transition metal oxide on a second electrode collector plate formed of a metal foil such as aluminum or an aluminum alloy. The electrode assembly (110) may be accommodated in a case (160) together with an electrolyte (500). The second electrode tab (112a) provided on the second electrode plate (112) is electrically connected to the second collector (154) among the collectors (150).

[0056] In some examples, the separator (113) is positioned between the first electrode plate (111) and the second electrode plate (112) to prevent short circuits and enable the movement of lithium ions, and may include a polyethylene, polypropylene, or a composite film of polyethylene and polypropylene. In addition, the separator (113) may be replaced with an inorganic solid electrolyte, such as a sulfide-based, oxide-based, or phosphate-based compound-based electrolyte that does not require a liquid or gel-based electrolyte (500).

[0057] In some examples, the electrolyte (500) may include a lithium salt such as LiPF6 or LiBF4 in an organic solvent such as EC, PC, DEC, EMC, or DMC. Additionally, the electrolyte (500) may be liquid or gel-like. In some examples, when an inorganic solid electrolyte is used, the electrolyte (500) may be omitted.

[0058] The terminal portion (120) is electrically connected to the current collector portion (150) and can be modified in various ways within the technical concept of protruding outward from the cap plate (171). The terminal portion (120) according to one embodiment of the present invention includes a first terminal (130) electrically connected to the first current collector portion (152) and a second terminal (140) electrically connected to the second current collector portion (154).

[0059] One side of the first terminal (130) is inserted into the first terminal hole (152a) of the first collector (152), and the other side of the first terminal (130) can be transformed into various shapes within the technical concept of extending outwardly of the cap assembly (170). In some examples, the first terminal (130) may include a first terminal pillar (132) and a first terminal plate (134).

[0060] In some examples, the first terminal pillar (132) may protrude and extend upwardly by a certain length through the cap plate (171) of the cap assembly (170), and may be inserted into the first terminal hole (152a) of the first collector (152) from the lower portion of the cap plate (171) to be electrically connected to the first collector (152). In some examples, the first terminal pillar (132) may be made of copper, a copper alloy, aluminum, or an aluminum alloy.

[0061] The first terminal plate (134) has a first hole (134a) extending in the vertical direction, and a first terminal pillar (132) can be coupled to the first hole (134a) and riveted and / or welded. In some examples, the facing surfaces between the first terminal pillar (132) exposed upwardly and the first terminal plate (134) can be welded to each other. For example, a laser beam can be provided to a boundary area between the first terminal pillar (132) exposed upwardly and the first terminal plate (134), so that the boundary area can be melted and then cooled to be welded to each other. In some examples, the first terminal pillar (132) and the first terminal plate (134) can be electrically insulated from the cap plate (171).

[0062] The first flange (132a), which is a protrusion shape protruding outward from the first terminal (130) pillar, is installed between the first terminal plate (134) and the cap assembly (170). Since the first flange (132a) is fixed between the first terminal plate (134) and the cap assembly (170), the vertical movement and lateral movement of the first terminal (130) pillar can be restricted.

[0063] The second terminal (140) is spaced apart from the first terminal (130) and is electrically connected to the second electrode plate (112), and various modifications are possible within the technical concept. The second terminal (140) according to one embodiment of the present invention includes a second terminal pillar (142) and a second flange (142a).

[0064] In some examples, the second terminal pillar (142) may protrude and extend upwardly by a certain length through the cap plate (171) of the cap assembly (170), and may be inserted into the second terminal hole (154a) of the second collector (154) from the lower portion of the cap plate (171) to be electrically connected to the second collector (154). In some examples, the second terminal pillar (142) may be made of copper, a copper alloy, aluminum, or an aluminum alloy.

[0065] The second terminal plate (144) has a second hole (144a) extending in the vertical direction, and a second terminal pillar (142) can be coupled to the second hole (144a) and riveted and / or welded. In some examples, the facing surfaces between the second terminal pillar (142) exposed upwardly and the second terminal plate (144) can be welded to each other. For example, a laser beam can be provided to a boundary area between the second terminal pillar (142) exposed upwardly and the second terminal plate (144), so that the boundary area can be melted and then cooled to be welded to each other. In some examples, the second terminal pillar (142) and the second terminal plate (144) can be electrically insulated from the cap plate (171).

[0066] A second flange (142a), which is a protrusion shape protruding outward from the second terminal pillar (142), is installed between the second terminal plate (144) and the cap assembly (170). Since the second flange (142a) is fixed between the second terminal plate (144) and the cap assembly (170), the vertical movement and lateral movement of the second terminal pillar (142) can be restricted.

[0067] The current collector (150) can be modified in various ways within the technical concept of electrically connecting the terminal (120) installed on the cap plate (171) and the electrode assembly (110). The current collector (150) according to one embodiment of the present invention includes a first current collector (152) and a second current collector (154).

[0068] In some examples, the first collector (152) may be brought into contact with a first electrode tab (111a) protruding from one end of the electrode assembly (110). In practice, the first collector (152) may be welded to the first electrode tab (111a). In some examples, the first collector (152) may be formed in an approximately '┎' shape, and a first terminal hole (152a) may be formed at the upper portion. In some examples, a first terminal post (132) may be fitted into the first terminal hole (152a) and riveted and / or welded. In some examples, the first collector (152) may be made of copper or a copper alloy.

[0069] The second current collector (154) may be in contact with the second electrode tab (112a) protruding from one end of the electrode assembly (110). In some examples, the second current collector (154) may be formed in an approximately '┑' shape, and a second terminal hole (154a) may be formed on the upper portion. In some examples, a second terminal post (142) is fitted into and coupled to the second terminal hole (154a). The second current collector (154) may be made of, for example, but not limited to, aluminum or an aluminum alloy. The second terminal post (142) may protrude and extend upward by a certain length through the cap plate (171) described below, and may also be electrically connected to the second current collector (154) at the lower portion of the cap plate (171).

[0070] The case (160) can be modified in various ways within the technical concept of accommodating the electrode assembly (110) inside. The case (160) according to one embodiment of the present invention may have a hollow, approximately rectangular parallelepiped shape with an opening formed at the top. The electrode assembly (110) may be inserted into the interior of the case (160) through this opening. In addition, the first current collector (152) and the second current collector (154) may also be positioned inside the case (160). The case (160) may include a rectangular bottom surface (161) and four side surfaces (162) extending approximately vertically from four sides of the bottom surface (161).

[0071] A cap assembly (170) may be coupled to a case (160). In some examples, the cap assembly (170) may include a cap plate (171), a first seal gasket (172a), a second seal gasket (172b), a stopper (173), and a safety vent (174).

[0072] The cap plate (171) can be modified in various ways within the technical concept of shielding the open entrance of the case (160). The cap plate (171) according to one embodiment of the present invention can be formed of the same material as the case (160). For example, but not limited to, the cap plate (171) can be joined to the case (160) by a laser welding method. Here, since the cap plate (171) can have the same polarity as the second terminal (140) as described above, the cap plate (171) and the case (160) can have the same polarity. The cap plate (171) is further provided with an electrolyte injection port (171a) and a vent hole (171b) penetrating between the upper surface and the lower surface.

[0073] The first seal gasket (172a) and the second seal gasket (172b) are made of an insulating material. The first seal gasket (172a) is installed between the cap plate (171) and the first terminal pillar (132) of the first terminal (130). In addition, the second seal gasket (172b) may be installed between the cap plate (171) and the second terminal pillar (142) of the second terminal (140).

[0074] The second seal gasket (172b) may be installed between the cap plate (171) and the first terminal plate (134). In addition, the second seal gasket (172b) may be installed between the cap plate (171) and the second terminal plate (144). The first seal gasket (172a) and the second seal gasket (172b) seal between the first terminal pillar (132) and the second terminal pillar (142) and the cap plate (171), respectively. The first seal gasket (172a) and the second seal gasket (172b) prevent external moisture from penetrating into the interior of the secondary battery (100) or prevent the electrolyte (500) contained inside the secondary battery (100) from leaking out to the outside.

[0075] The plug (173) can seal the electrolyte injection port (171a) after the electrolyte (500) is injected into the interior of the case (160) through the electrolyte injection port (171a) of the cap plate (171). The safety vent (174) is installed at a position facing the vent hole (171b) of the cap plate (171) and can be opened at a set pressure.

[0076] The insulating fixing member (200) can be modified in various ways within the technical concept of being installed between the electrode assembly (110) and the cap plate (171). The insulating fixing member (200) according to one embodiment of the present invention includes an insulating body (210) and a side portion (260).

[0077] FIG. 3 is a perspective view illustrating an insulating fixing part (200), an insulating door (300), and a current collector (150) according to an embodiment of the present invention, and FIG. 4 is a perspective view illustrating a side part (260) and an insulating door (300) according to an embodiment of the present invention. As illustrated in FIGS. 3 and 4, an insulating body (210) is positioned between a cap plate (171) and an electrode assembly (110), and various modifications are possible within the technical concept of being formed of an insulator. The insulating body (210) according to an embodiment of the present invention includes a vent part (220), an injection part (230), a transfer fixing hole part (240), and a guide hole (250).

[0078] The insulating door (300) is rotatably connected to the side portion (260) of the insulating fixing portion (200). The terminal portion (120) is inserted through a connecting hole (264) provided in the side portion (260) and is electrically connected to the current collector portion (150). With the current collector portion (150) connected to the terminal portion (120), the insulating door (300) rotates and is caught in the catch groove portion (266) provided in the side portion (260) to cover the current collector portion (150).

[0079] The insulating fixing part (200) extends in the longitudinal direction and can be installed in contact with the cap plate (171). A vent part (220) is positioned at the center of the insulating fixing part (200), and an injection part (230) that serves as a passage for the electrolyte (500) is provided on both sides or one side in the longitudinal direction of the vent part (220). In addition, side parts (260) are installed on both sides in the longitudinal direction of the insulating body (210).

[0080] FIGS. 5 and 6 are perspective views illustrating an insulating fixing part (200) and an insulating door (300) according to an embodiment of the present invention, and FIG. 10 is a bottom view illustrating a vent part (220) and an injection part (230) according to an embodiment of the present invention. As illustrated in FIGS. 5, 6, and 10, the vent part (220) may include a vent part (220) that is installed at a position facing a vent hole (171b) provided in a cap plate (171) and is connected to and communicates with the vent hole (171b). The vent part (220) according to an embodiment of the present invention may include a vent connection hole (222) that is installed at a position facing the vent hole (171b) and a reinforcing rib (224) that is installed inside the vent connection hole (222) and divides the vent connection hole (222) into a plurality of spaces.

[0081] The vent connection hole (222) can be installed on the lower side facing the vent hole (171b), and a reinforcing rib (224) that functions as a protective net is installed on the inside of the vent connection hole (222) to prevent external foreign substances from entering the interior of the secondary battery (100) through the vent connection hole (222). The reinforcing rib (224) can be configured in various ways, such as having multiple passages through which fluid can flow and having a lattice shape.

[0082] Fig. 11 is a side cross-sectional view illustrating a state in which an electrolyte (500) is supplied to the inside of an injection part (230) according to one embodiment of the present invention. As illustrated in Fig. 11, the injection part (230) is installed at a position facing the electrolyte injection port (171a) provided in the cap plate (171), and various modifications are possible within the technical concept of serving as a supply passage for the electrolyte (500). The injection part (230) according to one embodiment of the present invention may include an injection hole part (232) and a stopper (234).

[0083] The injection hole (232) can be modified in various ways within the technical concept of forming a hole in the insulating body (210) facing the electrolyte injection port (171a). The injection hole (232) is located below the electrolyte injection port (171a), and can be modified in various ways within the technical concept of forming a passage for the electrolyte (500) to flow when the electrolyte (500) falls downward through the supply pipe (400) installed in the electrolyte injection port (171a). The injection hole (232) may be in the shape of a pipe extending vertically.

[0084] The stopper (234) extends from the insulating body (210) and is located inside the injection hole (232), and various modifications are possible within the technical concept of changing the direction of falling of the electrolyte (500) falling through the injection hole (232). The stopper (234) according to one embodiment of the present invention is installed at a position facing the electrolyte injection port (171a). Therefore, the electrolyte (500) falling downward through the supply pipe (400) has a decreasing falling speed when it comes into contact with the stopper (234), and the direction of falling of the electrolyte (500) is also changed, thereby preventing the electrolyte (500) from splashing. The injection part (230) according to one embodiment of the present invention may be installed on both sides of the longitudinal direction of the vent part (220).

[0085] The transfer fixing hole (240) protrudes from the insulating body (210) toward the electrode assembly (110), and can be modified in various ways within the technical concept of forming a hole into which a moving projection is inserted when transporting a product. The transfer fixing hole (240) according to one embodiment of the present invention may be provided in multiple numbers. The transfer fixing holes (240) may be provided on both sides of the longitudinal direction of the vent part (220) with the vent part (220) as the center. After a separately provided moving projection is inserted into a hole provided in the transfer fixing hole (240), the insulating fixing part (200) can be moved in a post-process.

[0086] FIG. 12 is a front view illustrating a path through which an electrolyte (500) is discharged from an insulating fixing part (200) according to one embodiment of the present invention. As illustrated in FIGS. 5 and 12, the guide hole (250) forms a plurality of holes on the side surface (162) of the transfer fixing hole part (240), and various modifications are possible within the technical concept of discharging the electrolyte (500) located inside the transfer fixing hole part (240). The guide hole (250) guides the movement of the electrolyte (500) through a plurality of holes formed in the longitudinal direction of the insulating fixing part (200). The guide hole (250) formed on the side surface (162) of the injection part (230) guides the movement of the electrolyte (500) so that the electrolyte (500) supplied to the inside of the injection part (230) can move in various directions.

[0087] The side part (260) is located on both sides of the length direction of the insulating body (210), and various modifications are possible within the technical concept of allowing the insulating door (300) to be installed rotatably. The side part (260) according to one embodiment of the present invention includes a side body (262), a connecting hole (264), and a catching groove (266).

[0088] The side body (262) extends from the insulating body (210) and is installed at a position facing the first terminal (130) and the second terminal (140). The side body (262) having a square shape is provided with a connecting hole (264), which is a hole for inserting the first terminal pillar (132) or the second terminal pillar (142).

[0089] An insulating door (300) is rotatably installed on one side in the width direction of the side body (262), and a hooking groove (266) is installed on the other side in the width direction of the side body (262) so that the hooking hook (320) of the insulating door (300) is caught and movement is restricted. Various modifications are possible, such as an insulating door (300) is rotatably installed on one side in the length direction of the side body (262), and a hooking groove (266) is formed on the other side in the length direction of the side body (262) so that the hooking hook (320) of the insulating door (300) is caught and movement is restricted.

[0090] The insulating door (300) is rotatably installed on the insulating fixing member (200), and various modifications are possible within the technical concept of being fixed to the insulating fixing member (200) with the current collector (150) interposed therebetween. The insulating door (300) according to one embodiment of the present invention includes a door body (310), a discharge hole (312), a guide groove (314), and a hanging hook (320).

[0091] The door body (310) is rotatably connected to the side portion (260) and covers the end of the terminal portion (120) connected to the current collector (150). The door body (310) may be a plate-shaped body made of an insulator. The guide groove portion (314) forms a groove at a position facing the terminal portion (120). For example, when the end of the first terminal pillar (132) is inserted and fixed into the first terminal hole (152a) of the first current collector (152) through the connection hole (264) of the insulating fixing portion (200), the guide groove portion (314) is formed to prevent the first terminal pillar (132) from interfering with the insulating door (300).

[0092] A door body (310) according to one embodiment of the present invention forms holes on both sides of the longitudinal direction of the guide groove (314) and includes a discharge hole (312) for guiding the discharge of the electrolyte (500). The electrolyte (500) between the insulating door (300) and the insulating fixing part (200) can fall downward through the discharge hole (312).

[0093] The hook (320) may be formed in a ring shape that extends from the door body (310) and is hooked to the side portion (260). The hook (320) rotates together with the door body (310) and may be locked in the hook groove (266) provided in the side portion (260) to prevent movement.

[0094] Fig. 7 is a side cross-sectional view illustrating an open state of an insulating door (300) according to one embodiment of the present invention. As illustrated in Fig. 7, when the insulating door (300) is open, the first terminal pillar (132) and the first collector (152) are electrically connected by being fixed by welding or the like.

[0095] Fig. 8 is a side cross-sectional view illustrating a closed state of an insulating door (300) according to one embodiment of the present invention. As illustrated in Fig. 8, the insulating door (300) rotates so that the engaging hook (320) of the insulating door (300) engages the engaging groove (266) of the side portion (260), thereby shielding the lower end of the first terminal pillar (132) by the insulating door (300). Accordingly, the terminal portion (120) can be prevented from contacting the electrode assembly (110).

[0096] As described above, the secondary battery (100) according to the present invention can reduce material costs and assembly costs because the insulating fixing part (200) and the insulating door (300) are manufactured as an integral part. In addition, the logistics costs required to move the insulating fixing part (200) and the insulating door (300) can be reduced.

[0097] The above description is only one embodiment for implementing the secondary battery (100) according to the present invention, and the present invention is not limited to the above embodiment, and as claimed in the following claims, it will be said that the technical spirit of the present invention exists to the extent that anyone with ordinary knowledge in the field to which the present invention pertains can implement various modifications without departing from the gist of the present invention.

Claims

1. A case in which the electrode assembly is accommodated inside; A cap plate shielding the open inlet of the above case; A current collector electrically connecting the terminal portion installed on the cap plate and the electrode assembly; An insulating fixing member installed between the electrode assembly and the cap plate; and A secondary battery including an insulating door that is rotatably installed on the insulating fixing part and is fixed to the insulating fixing part with the current collector interposed therebetween.

2. In paragraph 1, The above insulating fixing part is an insulating body positioned between the cap plate and the electrode assembly; and A secondary battery including a side section located on both sides of the longitudinal direction of the insulating body and on which the insulating door is rotatably installed.

3. In paragraph 2, The above insulating door comprises a door body rotatably connected to the side section and covering an end of the terminal section connected to the current collector; and A secondary battery including a hook in the shape of a ring that extends from the door body and is hung on the side.

4. In paragraph 3, A secondary battery characterized in that the door body includes a guide groove portion forming a groove at a position facing the terminal portion.

5. In paragraph 4, A secondary battery characterized in that the door body further includes a discharge hole that forms holes on both sides of the length direction of the guide groove and guides discharge of the electrolyte.

6. In paragraph 3, A secondary battery characterized in that the above-mentioned hook rotates together with the door body and is restricted from moving by being caught in a catch groove provided on the side.

7. In paragraph 2, A secondary battery characterized in that the insulating body includes a vent part that is installed at a position facing a vent hole provided in the cap plate and is connected to and communicates with the vent hole.

8. In paragraph 7, The above vent part comprises a vent connection hole installed at a position facing the vent hole; and A secondary battery characterized by including a reinforcing rib installed on the inside of the vent connection hole and dividing the vent connection hole into a plurality of spaces.

9. In paragraph 7, A secondary battery characterized in that the insulating body includes an injection part that is installed at a position facing the electrolyte injection port provided in the cap plate and serves as a supply passage for the electrolyte.

10. In paragraph 9, The above injection part comprises a liquid injection hole part forming a hole in the insulating body facing the electrolyte injection port; and A secondary battery characterized by including a stopper extending from the insulating body and positioned inside the injection hole, the stopper changing the direction of falling of the electrolyte falling through the injection hole.

11. In paragraph 9, A secondary battery, characterized in that the injection part is installed on both sides of the longitudinal direction of the vent part.

12. In paragraph 2, A secondary battery characterized in that the insulating body further includes a transport fixing hole portion that protrudes from the insulating body in a direction toward the electrode assembly and forms a hole into which a moving projection is inserted when the product is transported.

13. In paragraph 12, A secondary battery characterized in that the insulating body further includes a guide hole for discharging an electrolyte located inside the transfer fixing hole, and a plurality of holes formed on the side of the transfer fixing hole.

14. Electrode assembly; A current collector electrically connected to the above electrode assembly; A terminal portion electrically connected to the above-mentioned collector and protruding outwardly from the cap plate; An insulating fixing part installed between the above-mentioned collector and the above-mentioned cap plate; and A secondary battery including an insulating door that is rotatably installed on the insulating fixing part and is fixed to the insulating fixing part with the current collector interposed therebetween.

15. In paragraph 14, The above insulating fixing part is an insulating body positioned between the cap plate and the electrode assembly; and A secondary battery including a side section located on both sides of the longitudinal direction of the insulating body and on which the insulating door is rotatably installed.

16. In paragraph 15, The above insulating door comprises a door body rotatably connected to the side section and covering an end of the terminal section connected to the current collector; and A secondary battery including a hook in the shape of a ring that extends from the door body and is hung on the side.

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