Secondary battery, secondary battery module, secondary battery pack, and vehicle

Abstract

The utility model relates to a secondary battery, a secondary battery module, a secondary battery pack and a vehicle. The technical problem to be solved is to provide a current path simplified structure for solving the problems of cost increase and performance reduction caused by various parts forming a current path of the secondary battery. Therefore, the utility model provides a secondary battery and a vehicle comprising the secondary battery, and the secondary battery comprises a plurality of electrode plates which are arranged in an electrode assembly; a plurality of electrode tabs extending from the plurality of electrode plates; a daughter board coupled to the plurality of electrode tabs; the daughter board penetrates through the cover board and is combined with the cover board; and an insulating member formed on the cover plate so as to surround the daughter board.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of secondary batteries, it is a secondary battery with subboard instead of the component of the current path of secondary battery. BACKGROUND

[0002] Unlike primary batteries that cannot be charged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries are used in small electronic devices that can be carried, such as smartphones, feature phones, notebook computers, digital cameras, and camcorders, and large-capacity secondary batteries are widely used as motor drive power sources and power storage batteries for hybrid electric vehicles, electric vehicles, and the like.

[0003] In general, a secondary battery includes an electrode assembly composed of a positive electrode and a negative electrode, a case that accommodates the electrode assembly, a terminal portion connected to the electrode assembly, various components that connect the terminal portion and the electrode assembly, and the like.

[0004] The above information disclosed in the technology that becomes the background of the utility model is only for improving the understanding of the background of the utility model, and therefore, it can also include information that does not constitute the prior art. SUMMARY

[0005] A secondary battery includes various components such as a terminal plate, a rivet, a current collector, a lower insulating component, etc. that constitute a current path between a terminal portion and an electrode assembly, and as the various components are manufactured and assembled, the cost increases, the current path passes through the various components, thereby increasing the resistance, and accordingly, there is a problem in that the performance of the secondary battery is reduced. Therefore, a current path simplification structure for reducing the cost and improving the performance of the secondary battery is proposed.

[0006] However, the technical problems to be solved by the utility model are not limited to the above technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description of the utility model described below.

[0007] A secondary battery according to an embodiment of the utility model for solving the above technical problems includes an electrode assembly and a case that accommodates the electrode assembly, and can include a plurality of electrode plates included in the electrode assembly, a plurality of electrode tabs extending from the plurality of electrode plates, a sub plate combined with the plurality of electrode tabs, a cover plate through which the sub plate passes and combined with the cover plate, and an insulating component formed on the cover plate in a manner of surrounding the sub plate.

[0008] The sub plate can be combined with the plurality of electrode tabs by laser welding.

[0009] The secondary battery can further include a gasket sealing component for sealing between the cover plate and the sub plate.

[0010] The insulating member can be formed by insert injection molding to surround the sub-plate.

[0011] The electrode assembly can further include a plurality of separators, wherein the electrode assembly can be formed by winding or stacking a stack of the plurality of electrode plates formed in a plate shape or a film shape and the plurality of separators.

[0012] The separator can include a porous substrate and a coating layer including an organic material, an inorganic material, or a combination thereof on one surface or both surfaces of the porous substrate.

[0013] The plurality of electrode plates can include a coated portion coated with an active material and an uncoated portion uncoated with the active material.

[0014] The plurality of electrode tabs can extend from the uncoated portion.

[0015] The secondary battery can be prismatic.

[0016] According to another aspect of the present application, a secondary battery module in which a plurality of the above-described secondary batteries are arranged and connected in a lateral or longitudinal direction can be provided.

[0017] According to still another aspect of the present application, a secondary battery pack in which a plurality of the above-described secondary battery modules are built in a group case can be provided.

[0018] According to still another aspect of the present application, a vehicle including a secondary battery pack manufactured using the above-described secondary battery can be provided.

[0019] According to the embodiments of the present application, a sub-plate is used instead of a component constituting a current path of a secondary battery, and thus it is possible to reduce the cost of the secondary battery by reducing the components and to improve the performance by reducing the length of a resistance path.

[0020] In particular, by removing components such as a terminal plate, a rivet, a current collector, a lower insulating member, etc. constituting a current path between a terminal portion and an electrode assembly, and by removing an assembly process such as welding or riveting, etc., it is possible to reduce the production cost of the secondary battery.

[0021] Further, the contact resistance between the components is reduced as the components are reduced, and the component resistance is reduced as the current path is shortened, and thus it is possible to improve the performance of the secondary battery.

[0022] In addition, in a vehicle to which the secondary battery of the present application is applied, it is possible to reduce the cost of the secondary battery, which accounts for the largest proportion in the price of the vehicle, and to improve the performance, and thus it is possible to improve the performance such as driving performance, driving distance, etc. while reducing the price of the vehicle.

[0023] However, the effects that can be obtained by the present application are not limited to the above-mentioned effects, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the application as described below. BRIEF DESCRIPTION OF DRAWINGS

[0024] The following drawings attached in the present specification exemplify the preferred embodiments of the present application, for further understanding the technical idea of the present application in conjunction with the detailed description of the application as described later, and therefore, the present application should not be construed as being limited to the matters as described in the drawings.

[0025] Figure 1a is a top view of a conventional prismatic secondary battery.

[0026] Figure 1b is a sectional view of line I-I' of Figure 1a

[0027] Figure 2a is a sectional view of a side surface of a secondary battery according to an embodiment of the present application.

[0028] Figure 2b is a plan view of a secondary battery according to an embodiment of the present application.

[0029] Figure 2c is a top view of a secondary battery according to an embodiment of the present application.

[0030] Figure 3a is a view showing a current path of a conventional prismatic secondary battery.

[0031] Figure 3b is a plan view of a terminal portion of a conventional prismatic secondary battery.

[0032] Figure 3c is a front view of a terminal portion of a conventional prismatic secondary battery.

[0033] Figure 4a is a view showing a current path of a secondary battery according to an embodiment of the present application.

[0034] Figure 4b is a plan view of a terminal portion of a secondary battery according to an embodiment of the present application.

[0035] Figure 4c is a front view of a terminal portion of a secondary battery according to an embodiment of the present application.

[0036] Figures 5a to 5f is a view for explaining a manufacturing method of a secondary battery according to an embodiment of the present application.

[0037] Figure 6 ​is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application.

[0038] Figure 7 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. Figure 6 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application.

[0039] Figure 8 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. Figure 7 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Before the description, the terms or words used in the present specification and claims should not be interpreted as being limited to general or dictionary meanings, but should be interpreted as having meanings and concepts meeting the technical ideas of the present application based on the principle that the inventor can appropriately define the concepts of the terms in order to describe his own application in the best way. Therefore, the embodiments described in the present specification and the configurations illustrated in the accompanying drawings are merely the most preferred embodiments and do not represent all technical ideas of the present application. Accordingly, it is to be understood that there can be various equivalents and modifications of these described embodiments.

[0041] Also, in the present specification, "comprise", "include" and / or "comprising", "including" used in the present specification are used to specify the presence of the stated shape, number, step, operation, component, element, and / or their combination, and do not exclude the presence or addition of one or more other shapes, numbers, operations, components, elements, and / or their combinations.

[0042] In addition, the drawings are not drawn to actual scale in order to help understanding of the present application, and the sizes of some constituent elements can be exaggeratedly shown. Also, the same reference numerals can be given to the same constituent elements in different embodiments from each other.

[0043] The reference to two comparison objects "identical" means "substantially identical". Therefore, the substantially identical can include a case having a deviation considered to be a lower level in the art, for example, can include a case having a deviation of 5% or less. In addition, the uniformity of certain parameters in a predetermined region can mean uniformity from the viewpoint of the average.

[0044] Although first, second, and the like are used for explanation of various constituent elements, the constituent elements are obviously not limited by these terms. The terms are used only to distinguish one constituent element from other constituent elements, and the first constituent element can be obviously the second constituent element as long as there is no special contrary description.

[0045] Throughout the specification, unless particularly noted otherwise, each constitutional element can be singular or plural.

[0046] The arrangement of "upper (or lower)" of a constitutional element or "upper (or lower)" of a constitutional element means not only the arrangement in contact with the upper (or lower) of the constitutional element but also that another constitutional element can be interposed between the constitutional element and the arbitrary constitutional element arranged on (or under) the constitutional element.

[0047] Also, when described as one constitutional element is "on", "connected to", or "coupled to" another constitutional element, the constitutional elements can be directly connected or coupled to each other, but it should be understood that another constitutional element can be "interposed" between the constitutional elements, or the constitutional elements can be "connected", "coupled", or "coupled" through another constitutional element.

[0048] As used in this specification, the term "and / or" includes any and all combinations of one or more of the associated listed items. Also, "can" used in describing the embodiments of the present application is in reference to "one or more embodiments of the present application". "One or more" preceding an element of a list and similar phrases such as "one or more" are intended to modify the entire list of elements and not the individual elements of the list.

[0049] Throughout the specification, when referring to "A and / or B", it means A, B, or A and B, unless particularly noted otherwise, and when referring to "C to D", it means C or less and D, unless particularly noted otherwise.

[0050] When a statement 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 consisting of A, B, and C", or "at least one selected from A, B, and C" is used to designate a list of A, B, and C, the statement can refer to any and all appropriate combinations of the items in the list.

[0051] The term "use" can be considered synonymous with the term "utilize". As used in this specification, the terms "substantially", "approximately", and similar terms are used as terms of approximation and not as terms of degree, and are intended to account for the inherent variations in a measurement or calculation that would be recognized by those of ordinary skill in the art.

[0052] Although the terms first, second, third, and the like can be used herein to describe various elements, constituent elements, regions, layers, and / or sections, these elements, constituent elements, regions, layers, and / or sections should not be limited by these terms. The terms are used to distinguish one element, constituent element, region, layer, or section from another element, constituent element, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from the teachings of example embodiments.

[0053] To describe a relationship of one element or feature to another element or feature as shown in the drawings, spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used for ease of illustration. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientations depicted in the drawings. For example, if a device in the drawings is inverted, then other elements would be understood to be below or beneath other elements, and the depicted element would be understood to be above or on top of the other elements. The term "below" can encompass both of the directions of above and below. Thus, the term "below" can encompass both of the directions of above and below.

[0054] The terms used in the present specification are used to describe the embodiments of the present application and are not intended to limit the present application.

[0055] The types of secondary batteries include coin type, cylindrical type, prismatic type, and pouch type. Since the present application can be applied to a prismatic secondary battery in principle, a prismatic secondary battery will be described schematically before describing embodiments of the present application.

[0056] Figure 1a is a perspective view of a conventional prismatic secondary battery, Figure 1b is Figure 1a is a cross-sectional view of I-I' of

[0057] First, the appearance of a conventional prismatic secondary battery shown in FIG. 1 will be described. Figure 1a

[0058] The case 51 forms the overall appearance of the prismatic secondary battery, and can be formed of an electrically conductive metal such as aluminum, an aluminum alloy, or nickel-plated steel. In addition, the case 51 can provide a space to accommodate an electrode assembly.

[0059] ​The cap assembly 60 can include a cover plate 61 covering the opening of the case 51, and the case 51 and the cover plate 61 can be configured with an electrically conductive substance. Here, the first terminal 62 and the second terminal 63 can be provided to be electrically connected to the positive or negative electrode inside and protrude to the outside through the cover plate 61.

[0060] The cover plate 61 can be formed with an electrolyte injection port 64 to which a sealing plug can be provided, and can be provided with a gas exhaust port 66 formed with a notch 65. The gas exhaust port 66 is used to degas gas generated inside the battery.

[0061] Referring to Figure 1b The internal structure of the prismatic secondary battery and the combined structure with the cap assembly 60 will be described.

[0062] Figure 1b The prismatic secondary battery illustrated can basically include the electrode assembly 40, the first current collecting part 41, the first terminal 62, the second current collecting part 42, the second terminal 63, and the cap assembly 60.

[0063] The electrode assembly 40 can be formed of a stack of a first electrode plate, a separator, and a second electrode plate formed in a sheet shape or a film shape by winding or stacking. When the electrode assembly 40 is a wound stack, the winding axis can be parallel to the length direction of the case 51. Also, the electrode assembly 40 can be a stacked type rather than a wound type, but in the present application, the shape of the electrode assembly 40 is not limited. Also, the electrode assembly 40 can be a Z-stacked electrode assembly in which the first electrode plate and the second electrode plate are inserted into both sides of a separator bent into a Z-stack. Also, the electrode assembly 40 can be one or more electrode assemblies whose long sides are stacked adjacent to each other and accommodated inside the case, and in the present application, the number of electrode assemblies is not limited. The first electrode plate of the electrode assembly 40 can function as a negative electrode, and the second electrode plate can function as a positive electrode, and vice versa.

[0064] The first electrode plate can be formed by coating a first electrode active material such as graphite or carbon on a first electrode current collecting plate formed of a metal foil such as copper, copper alloy, nickel, or nickel alloy, and can include a first electrode tab (or a first uncoated portion) which is a region where the first electrode active material is not coated. The first electrode tab 43 can become a passage for the flow of current between the first electrode plate and the first current collecting part 41. In some examples, when the first electrode plate is manufactured, the first electrode tab 43 can be cut in advance to protrude to one side, and can protrude further to one side than the separator without being separately cut.

[0065] The second electrode plate can be formed by coating a second electrode active material such as a transition metal oxide on a base material formed of a metal foil such as aluminum or an aluminum alloy, and can include a second electrode tab (or a second uncoated portion) 44 as a region where the second electrode active material is not coated. The second electrode tab 44 can serve as a passage for current flow between the second electrode plate and the second current collecting portion 42. In some examples, when the second electrode plate is manufactured, the second electrode tab 44 can be formed by being cut in advance to protrude to the other side, and can protrude further to the other side than the separator without being separately cut.

[0066] In some embodiments, the first electrode tab 43 can be located at the right side end side of the electrode assembly 40, the second electrode tab 44 can be located at the left side end side of the electrode assembly 40, or can also be located on one side in the same direction. Here, the left side and the right side are for convenience of explanation based on the secondary battery shown in FIG. 1, and when the secondary battery is rotated left and right or up and down, the positions thereof can change.

[0067] The separator functions to allow movement of lithium ions while preventing short circuiting of the first electrode plate and the second electrode plate. The separator can be configured of, for example, a polyethylene film, a polypropylene film, a polyethylene-polypropylene film, or the like.

[0068] The first electrode tab 43 of the first electrode plate and the second electrode tab 44 of the second electrode plate respectively extend from both side end portions of the electrode assembly 40 as described above. In some embodiments, the electrode assembly 40 can be accommodated in the case 51 together with the electrolyte solution.

[0069] In the electrode assembly 40, the first electrode tab 43 and the second electrode tab 44 extending to both sides from the first electrode plate and the second electrode plate are respectively connected to the first current collecting portion 41 and the second current collecting portion 42 by welding.

[0070] The first current collecting portion 41 and the second current collecting portion 42 are respectively connected to the first terminal 62 and the second terminal 63 of the structure described above by terminal pins 67. Figure 1a In some embodiments, the outer peripheral surface of the terminal pin 67 can be thread processed, and can be fastened to the first terminal 62 and the second terminal 63 by thread coupling. However, the present application is not limited thereto, and the terminal pin 67 can also be coupled to the first terminal 62 and the second terminal 63 by riveting or welding.

[0071] The secondary battery according to an embodiment of the present application proposes a secondary battery having a structure different from that of the conventional prismatic secondary battery shown in FIGS. 1 to 6, and the like, and hereinafter, the structure of the secondary battery will be described with reference to FIGS. 7 to 10. Figure 1a and Figure 1b The secondary battery according to an embodiment of the present application proposes a secondary battery having a structure different from that of the conventional prismatic secondary battery shown in FIGS. 1 to 6, and the like, and hereinafter, the structure of the secondary battery will be described with reference to FIGS. 7 to 10. Figures 2a to 2cAn embodiment of a secondary battery according to the present application is described.

[0072] Figure 2a is a side sectional view of a secondary battery according to an embodiment of the present application, Figure 2b is a plan view of a secondary battery according to an embodiment of the present application, Figure 2c is an upper front view of a secondary battery according to an embodiment of the present application.

[0073] Referring to Figures 2a to 2c , a secondary battery 100 according to an embodiment of the present application includes an electrode assembly 110, a case 120 accommodating the electrode assembly 110, a plurality of electrode tabs 130, a sub plate 140, a cover plate 150, and an insulating member 160.

[0074] The electrode assembly 110 includes a plurality of electrode plates 111 and a plurality of separators 112, and can be formed by winding or stacking a stack of the plurality of electrode plates 111 and the plurality of separators 112 formed in a plate shape or a film shape. In the case of the electrode assembly 110 being a wound stack, a winding axis can be parallel to a length direction of the case. In addition, the electrode assembly 110 can be a stacked type rather than a wound type, but in the present application, the shape of the electrode assembly 110 is not limited. In some embodiments, the electrode assembly 110 can be accommodated in the case 120 together with an electrolyte solution.

[0075] The plurality of electrode plates 111 can have a polarity of a positive electrode or a negative electrode according to a polarity of a corresponding terminal. In addition, the plurality of electrode plates 111 can include a coated portion coated with an active material and an uncoated portion not coated with the active material. In the case of the plurality of electrode plates 111 being negative electrodes, the plurality of electrode plates 111 can be formed by coating a metal foil such as copper, copper alloy, nickel, or nickel alloy with an active material such as graphite or carbon, and in the case of the plurality of electrode plates 111 being positive electrodes, the plurality of electrode plates 111 can be formed by coating a metal foil such as aluminum or aluminum alloy with an active material such as a transition metal oxide.

[0076] The plurality of separators 112 functions to allow movement of lithium ions while preventing short circuiting of the plurality of electrode plates 111. The plurality of separators 112 can be constituted of, for example, a polyethylene film, a polypropylene film, a polyethylene-polypropylene film, or the like.

[0077] The case 120 forms an overall appearance of a prismatic secondary battery, and can be formed of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel. In addition, the case 120 can provide a space to accommodate the electrode assembly 110.

[0078] A plurality of electrode tabs 130 extend from the plurality of electrode plates 111. In an embodiment, the plurality of electrode tabs 130 can extend from the uncoated portions of the plurality of electrode plates 111.

[0079] The plurality of electrode tabs 130 are combined with a sub plate 140. The sub plate 140 functions to collect the electric current transmitted through the plurality of electrode tabs 130 from the electrode assembly 110 and transmit it to the outside. In an embodiment, the sub plate 140 can be constructed of the same material as the plurality of electrode plates 111 and the plurality of electrode tabs 130. Also, in an embodiment, the sub plate 140 can be combined with the plurality of electrode tabs 130 by laser welding.

[0080] A cover plate 150 is combined with the sub plate 140 by passing the sub plate 140 through the cover plate 150. The cover plate 150 can include a through hole for passing the sub plate 140 therethrough. The cover plate 150 has a substantially rectangular plate form. The cover plate 150 covers the opening of the case 120. For example, the cover plate 150 can be combined to the case 120 by laser welding or the like. Like the case 120, the cover plate 150 can be constructed of an electrically conductive substance. In addition, besides the through hole, the cover plate 150 can be formed with an injection hole 151 for injecting an electrolyte, an exhaust hole (not shown) for being combined with an exhaust port, or the like. When the internal pressure of the secondary battery rises, the exhaust port is ruptured to function as a gas exhaust, and a general exhaust port structure can be applied.

[0081] An insulating member 160 is formed on the cover plate 150 in a manner of surrounding the sub plate 140. The insulating member 160 functions to insulate the sub plate 140 from the cover plate 150. The insulating member 160 can be entirely made of an insulating material. In an embodiment, the insulating member 160 can be formed in a manner of surrounding the sub plate 140 by insert injection molding.

[0082] The structure of the secondary battery according to an embodiment of the present application is described above, and the advantageous effects resulting from the difference in structure between the secondary battery according to an embodiment of the present application and the conventional prismatic secondary battery are described below with reference to Figures 3a to 4c The advantageous effects resulting from the difference in structure between the secondary battery according to an embodiment of the present application and the conventional prismatic secondary battery are described below with reference to

[0083] Figure 3a FIG. 1 is a perspective view showing the structure of a conventional prismatic secondary battery, Figure 3b FIG. 2 is a plan view showing a terminal portion of the conventional prismatic secondary battery, Figure 3c FIG. 3 is a front view showing the terminal portion of the conventional prismatic secondary battery.

[0084] The structure of the secondary battery according to an embodiment of the present application is described above, and the advantageous effects resulting from the difference in structure between the secondary battery according to an embodiment of the present application and the conventional prismatic secondary battery are described below with reference to Figures 3a to 3cA current path of a conventional prismatic secondary battery includes a terminal plate 210, a rivet 220, a current collector 230, a sub tab 240, and a lower insulating member 250. In the conventional prismatic secondary battery, in the case of a negative terminal, a movement path of electrons is transmitted from an electrode assembly to the outside through the sub tab 240, the current collector 230, and the rivet 220, and then through the terminal plate 210. Thus, since the current path of the conventional prismatic secondary battery passes through various members, a contact resistance is generated between the members, and the current path is lengthened to increase a member resistance, thereby affecting the performance of the secondary battery. In addition, as various members are used, the cost of the secondary battery is also increased.

[0085] Figure 4a FIG. 1 is a view showing a current path of a secondary battery according to an embodiment of the present application, Figure 4b FIG. 2 is a plan view of a terminal portion of a secondary battery according to an embodiment of the present application, Figure 4c FIG. 3 is a front view of a terminal portion of a secondary battery according to an embodiment of the present application.

[0086] Referring to Figures 4a to 4c , a current path of a secondary battery according to an embodiment of the present application is composed of only a plurality of electrode tabs 130 and a sub plate 140. In the secondary battery according to an embodiment of the present application, in the case of a negative terminal, a movement path of electrons is directly transmitted from an electrode assembly 110 to the outside through the plurality of electrode tabs 130 and the sub plate 140. Thus, in the current path of the secondary battery according to an embodiment of the present application, all members, such as a terminal plate, a rivet, a current collector, a lower insulating member, etc., which constitute a current path between a terminal portion and the electrode assembly, are removed, so that a contact resistance between the members is reduced as the number of members is reduced, and a member resistance is reduced as the current path is shortened, thereby improving the performance of the secondary battery. In addition, by removing the members constituting the current path and removing an assembly process such as welding or riveting, etc., the production cost of the secondary battery can be reduced.

[0087] According to Figure 4a , the secondary battery according to an embodiment of the present application can further include a gasket sealing member 170 for sealing between the cover plate 150 and the sub plate 140. The gasket sealing member 170 is used to prevent a liquid such as an electrolyte inside the secondary battery or a gas generated due to a chemical action inside the secondary battery from leaking to the outside of the secondary battery.

[0088] Figures 5a to 5f FIG. 4 is a view for explaining a secondary battery manufacturing method according to an embodiment of the present application.

[0089] Referring to Figure 5aThe electrode assembly 110 including a plurality of electrode plates 111 is manufactured. At this time, a plurality of electrode tabs 130 can be provided extending from the plurality of electrode plates 111.

[0090] Referring to Figure 5b and Figure 5c The plurality of electrode tabs 130 extending from the plurality of electrode plates 111 are coupled to the sub plate 140. In Figure 5b an embodiment, the plurality of electrode tabs 130 can be bent toward the sub plate 140 so as to be in contact with the sub plate 140. Also, in Figure 5c an embodiment, the plurality of electrode tabs 130 and the sub plate 140 can be coupled by laser welding.

[0091] Referring to Figure 5d The sub plate 140 is coupled to the cover plate 150 through the cover plate 150. In Figure 5d an embodiment, a gasket sealing member 170 for sealing between the cover plate 150 and the sub plate 140 can be coupled to the sub plate 140 by being interposed between the cover plate 150.

[0092] Referring to Figure 5e The insulating member 160 is formed on the cover plate 150 in a manner of surrounding the sub plate 140. In Figure 5e an embodiment, the insulating member 160 can be formed in a manner of surrounding the sub plate 140 by insert injection molding.

[0093] Referring to Figure 5f The electrode assembly 110 is accommodated in the case 120, and the cover plate 150 and the case 120 are coupled. In Figure 5f an embodiment, the cover plate 150 and the case 120 can be coupled by being welded.

[0094] Hereinafter, materials usable for the secondary battery according to the present application will be described.

[0095] As the positive active material, a compound capable of reversibly intercalating and deintercalating lithium (lithiated intercalation compound) can be used. Specifically, one or more selected from a complex oxide of a metal and lithium selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0096] The complex oxide can be a lithium transition metal complex oxide, and as a specific example, a lithium nickel-based oxide, a lithium cobalt-based oxide, a lithium manganese-based oxide, a lithium iron phosphate-based compound, a cobalt-free nickel manganese-based oxide, or a combination thereof can be listed.

[0097] As an example, a compound represented by any one of the following chemical formulas can be used. Li a A 1-b X b O2-c D c (0.90 < a < 1.8, 0 < b < 0.5, 0 < c < 0.05); Li a Mn 2-b X b O 4-c D c (0.90 < a < 1.8, 0 < b < 0.5, 0 < c < 0.05); Li a Ni 1-b-c Co b X c O 2-α D α (0.90 < a < 1.8, 0 < b < 0.5, 0 < c < 0.5, 0 < a < 2); Li a Ni 1-b- c Mn b X c O 2-α D α (0.90 < a < 1.8, 0 < b < 0.5, 0 < c < 0.5, 0 < a < 2); Li a Ni b Co c L 1 d G e O2(0.90 < a < 1.8, 0 < b < 0.9, 0 < c < 0.5, 0 < d < 0.5, 0 < e < 0.1); Li a NiG b O2(0.90 < a < 1.8, 0.001 < b < 0.1); Li a CoG b O2(0.90 < a < 1.8, 0.001 < b < 0.1); Li a Mn 1-b G b O2(0.90 < a < 1.8, 0.001 < b < 0.1); Li a Mn2G b O4(0.90 < a < 1.8, 0.001 < b < 0.1); Li a Mn 1-g G g PO4(0.90 < a < 1.8, 0 < g < 0.5); Li (3-f) Fe2(PO4)3(0 < f < 2); Li a FePO4(0.90 < a < 1.8).

[0098] In the above formula, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L 1 is Mn, Al, or a combination thereof.

[0099] A cathode for a lithium secondary battery can include a current collector and a cathode active material layer formed on the current collector. The cathode active material layer includes a cathode active material, and can further include a binder and / or a conductive material.

[0100] The content of the cathode active material can be 90% to 99.5% by weight, based on 100% by weight of the cathode active material layer, and the content of the binder and the conductive material can be 0.5% to 5% by weight, respectively, based on 100% by weight of the cathode active material layer.

[0101] As the current collector, Al can be used, but is not limited thereto.

[0102] The negative active material includes a substance capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and undoping lithium, or a transition metal oxide.

[0103] The substance capable of reversibly intercalating / deintercalating the lithium ions can be a carbon-based negative active material, and can include, for example, crystalline carbon, amorphous carbon, or a combination thereof. As examples of the crystalline carbon, graphite such as natural graphite or artificial graphite can be cited, and as examples of the amorphous carbon, soft carbon or hard carbon, mesophase pitch carbide, calcined coke, or the like can be cited.

[0104] A Si-based negative active material or a Sn-based negative active material can be used as the material capable of doping and undoping lithium. The Si-based negative active material can be silicon, a silicon-carbon composite, SiO x (0 < x < 2), a Si-based alloy, or a combination thereof.

[0105] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to an implementation example, the silicon-carbon composite can be in a form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0106] The silicon-carbon composite can further include crystalline carbon. For example, the silicon-carbon composite can include a core including crystalline carbon and silicon particles, and an amorphous carbon coating layer located on the surface of the core.

[0107] A negative electrode for a lithium secondary battery can include a current collector and a negative active material layer on the current collector. The negative active material layer can include a negative active material, and can further include a binder and / or a conductive material.

[0108] For example, the negative active material layer can include 90 to 99% by weight of a negative active material, 0.5 to 5% by weight of a binder, and 0 to 5% by weight of a conductive material.

[0109] A non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof can be used as the binder. When an aqueous binder is used as the negative binder, a cellulose-based compound capable of imparting adhesiveness can be further included.

[0110] As the negative current collector, a material selected from the group consisting of a copper foil, a nickel foil, a stainless steel foil, a titanium foil, a nickel foam, a copper foam, a polymer substrate coated with a conductive metal, and a combination thereof can be used.

[0111] An electrolyte for a lithium secondary battery can include a non-aqueous organic solvent and a lithium salt.

[0112] The non-aqueous organic solvent functions as a medium that can move ions participating in an electrochemical reaction of a battery.

[0113] The non-aqueous organic solvent can be a carbonate-based, an ester-based, an ether-based, a ketone-based, an alcohol-based solvent, an aprotic solvent, or a combination thereof, and can be used alone or in a mixture of two or more.

[0114] In addition, when a carbonate-based solvent is used, a cyclic carbonate and a chain carbonate can be mixed and used.

[0115] A separator can be present between a positive electrode and a negative electrode according to the type of a lithium secondary battery. As such a separator, a polyethylene, a polypropylene, a polyvinylidene fluoride, or a multi-layer film of two or more layers thereof can be used.

[0116] The separator can include a porous substrate and a coating layer containing an organic material, an inorganic material, or a combination thereof on one surface or both surfaces of the porous substrate.

[0117] The organic material can include a polyvinylidene fluoride-based polymer or a (meth)acrylic-based polymer.

[0118] The inorganic material can include inorganic particles selected from the group consisting of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and a combination thereof, but is not limited thereto.

[0119] The organic matter and the inorganic matter can exist mixed in one coating layer, or can exist in a stacked form of a coating layer containing the organic matter and a coating layer containing the inorganic matter.

[0120] Figure 6 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. As high capacity of secondary batteries for driving electric vehicles is increased, a secondary battery module can be manufactured by arranging and connecting a plurality of secondary battery cells in a lateral and / or longitudinal direction.

[0121] A plurality of secondary batteries are arranged in a space formed by a pair of opposite end plates 71a, 71b and a pair of opposite side plates 72a, 72b. The arrangement of the secondary batteries can be designed in an arrangement direction and a number in order to obtain a desired voltage and current specification.

[0122] Figure 7 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. As high capacity of secondary batteries for driving electric vehicles is increased, a secondary battery module can be manufactured by arranging and connecting a plurality of secondary battery cells in a lateral and / or longitudinal direction. Figure 6 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. As high capacity of secondary batteries for driving electric vehicles is increased, a secondary battery module can be manufactured by arranging and connecting a plurality of secondary battery cells in a lateral and / or longitudinal direction.

[0123] The secondary battery pack 80 can be manufactured by embedding a plurality of secondary battery modules in a group case designed in a form to be mounted to an actual product. The group case can include a fastening portion and an electrical lead-out portion required to be mounted to a product. In Figure 7 In FIG. 10, for convenience of illustration, the illustration of related elements such as bus bars for electrical connection of the secondary batteries, cooling units, and external terminals, etc. is omitted.

[0124] The secondary battery pack can be mounted in a vehicle. As an example, the vehicle can be an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle. The vehicle includes a four-wheel drive or a two-wheel drive vehicle.

[0125] Figure 8 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. As high capacity of secondary batteries for driving electric vehicles is increased, a secondary battery module can be manufactured by arranging and connecting a plurality of secondary battery cells in a lateral and / or longitudinal direction. Figure 7 is a conceptual view of a vehicle including the secondary battery pack illustrated in FIG. 10. Figure 8 is an example view illustrating a secondary battery module in which secondary batteries are arranged according to an embodiment of the present application. As high capacity of secondary batteries for driving electric vehicles is increased, a secondary battery module can be manufactured by arranging and connecting a plurality of secondary battery cells in a lateral and / or longitudinal direction.

[0126] The above, although the present application is explained by the defined embodiments and the drawings, the present application is not limited thereto, obviously can be variously modified and changed in the equivalent range of the protection scope recorded in the technical thought and the claim book of the present application by the person having ordinary knowledge in the technical field to which the present application belongs.

[0127] Explanation of reference numerals

[0128] 40: electrode assembly; 41: first current collector; 42: second current collector; 43: first electrode tab; 44: second electrode tab (second uncoated portion); 51: case; 60: cover assembly; 61: cover plate; 62: first terminal; 63: second terminal; 64: electrolyte injection port; 65: notch; 66: exhaust port; 67: terminal pin; 71a, 71b: end plate; 72a, 72b: side plate; 80: secondary battery pack; 100: secondary battery; 110: electrode assembly; 111: electrode plate; 112: separator; 120: case; 130: electrode tab; 140: sub plate; 150: cover plate; 151: injection hole; 160: insulating member; 170: gasket sealing member; 210: terminal plate; 220: rivet; 230: current collector; 240: sub tab; 250: lower insulating member.

Claims

1. A secondary battery comprising an electrode assembly and a housing for accommodating the electrode assembly, characterized in that: The secondary battery includes: a plurality of electrode plates included in the electrode assembly; a plurality of electrode tabs extending from the plurality of electrode plates; a daughter board, coupled to the plurality of electrode tabs; a cover plate, wherein the sub-plate passes through the cover plate and is combined with the cover plate; and An insulating component is formed on the cover plate so as to surround the sub-plate.

2. The secondary battery according to claim 1, wherein The sub-plate is combined with the plurality of electrode tabs by laser welding.

3. The secondary battery according to claim 1, wherein Also includes: The gasket sealing component is used for sealing between the cover plate and the sub-plate.

4. The secondary battery according to claim 1, wherein The insulating component is formed by insert injection molding in a manner of surrounding the sub-board.

5. The secondary battery according to claim 1, wherein The electrode assembly further includes a plurality of separators, The electrode assembly is formed by winding or stacking a stack of the plurality of electrode plates and the plurality of separators formed in a plate shape or a film shape.

6. The secondary battery according to claim 5, characterized in that The separator includes a porous substrate and a coating layer containing organic matter, inorganic matter or a combination thereof located on one surface or both surfaces of the porous substrate.

7. The secondary battery according to claim 1, wherein The plurality of electrode plates include a coating portion coated with an active material and an uncoating portion not coated with the active material.

8. The secondary battery according to claim 7, wherein The plurality of electrode tabs extend from the non-coating portion.

9. The secondary battery according to claim 1, wherein The secondary battery is prismatic.

10. A secondary battery module, characterized in that: A plurality of secondary batteries according to claim 1 are arranged and connected in a horizontal or vertical direction.

11. A secondary battery pack, characterized in that: A plurality of secondary battery modules according to claim 10 are built into a pack case.

12. A vehicle, characterized in that: The secondary battery according to claim 1 is included.

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