Bus bar assembly and battery pack comprising same

Abstract

The present disclosure relates to a bus bar assembly and a battery pack comprising same. The technical problem is to be solved by providing a bus bar assembly capable of improving the rigidity of a bus bar body, and a battery pack comprising same. To this end, the present disclosure provides the bus bar assembly comprising: a bus bar body, which is electrically connected to a plurality of battery cells and includes a bending part formed to be bent; and a holder part disposed on the bus bar body and fixed to the bending part.

Description

Busbar assembly and battery pack including the same

[0001] The present disclosure relates to a busbar assembly and a battery pack including the same.

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode tabs connected to the electrode assembly.

[0003] Multiple battery cells can be connected in series and / or parallel to increase the voltage and capacity of a secondary battery. Busbars are used to connect battery cells in series and / or parallel; however, there is a height difference between the position where the positive electrode is located and the position where the negative electrode is located within the battery cells, and the spacing between battery cells may change due to swelling. To solve these problems, the busbars can be bent to compensate for the height difference or to compensate for changes in the spacing between battery cells.

[0004] Since the part where the busbar bends is susceptible to damage from impact, a structure or method capable of reinforcing the rigidity of the part where the busbar bends is required.

[0005] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art.

[0006] The purpose of the present invention is to provide a busbar assembly capable of improving the rigidity of a busbar body and a battery pack including the same.

[0007] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below.

[0008] A busbar assembly according to the present invention for solving the above technical problem comprises: a busbar body having a bending portion formed to be electrically connected to a plurality of battery cells and bent; and a holder portion disposed on the busbar body and fixed to the bending portion.

[0009] The above busbar body can connect a plurality of the above battery cells in parallel.

[0010] The above busbar body can connect a plurality of the above battery cells in series.

[0011] The above busbar body can connect a plurality of the above battery cells in series and parallel.

[0012] The height of the first part of the bending section of the above bending section may differ from the height of the second part of the bending section.

[0013] The holder portion may include a lower holder portion that contacts the lower part of the busbar body; and an upper holder portion that contacts the upper part of the busbar body and is coupled to the lower holder portion.

[0014] The holder portion may further include a hinge portion that connects the upper holder portion to rotate relative to the lower holder portion.

[0015] The above holder portion may further include a fastening portion connecting the lower holder portion and the upper holder portion.

[0016] The above-mentioned fastening portion may include a fastening groove formed as a concave groove in the holder portion; and a fastening projection protruding from the holder portion and inserted into the fastening groove.

[0017] The holder portion may further include a holder spacing projection that protrudes from the lower holder portion, is inserted into the bending portion, and is positioned to contact the bending portion.

[0018] It may further include an elastic member disposed between the busbar body and the holder portion to press the holder portion.

[0019] It may further include a holder connecting body that connects a plurality of the above-mentioned holder parts provided in a plurality.

[0020] A battery pack according to the present invention for solving the above technical problem comprises: a housing; a plurality of battery cells disposed inside the housing; and a busbar assembly electrically connecting the plurality of battery cells; wherein the busbar assembly comprises: a busbar body having a bending portion formed to be electrically connected to the plurality of battery cells and formed to be bent; and a holder portion disposed on the busbar body and fixed to the bending portion.

[0021] The above busbar body can connect a plurality of the above battery cells in parallel.

[0022] The above busbar body can connect a plurality of the above battery cells in series.

[0023] The above busbar body can connect a plurality of the above battery cells in series and parallel.

[0024] The height of the first part of the bending section of the above bending section may differ from the height of the second part of the bending section.

[0025] The holder portion may include a lower holder portion that contacts the lower part of the busbar body; and an upper holder portion that contacts the upper part of the busbar body and is coupled to the lower holder portion.

[0026] The holder portion further includes a fastening portion connecting the lower holder portion and the upper holder portion; and the fastening portion may include a fastening groove formed as a concave groove in the holder portion; and a fastening projection protruding from the holder portion and inserted into the fastening groove.

[0027] The above busbar assembly may further include a holder connecting body that connects a plurality of the holder parts provided in a plurality.

[0028] Through the busbar assembly according to the present invention and the battery pack including the same, the rigidity of the busbar can be improved, thereby improving stability.

[0029] In addition, the battery pack can be protected from external impact through the busbar assembly according to the present invention and the battery pack including the same.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0031] FIG. 1 is a perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0032] FIG. 2 is a plan view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0033] FIG. 3 is a perspective view schematically showing the configuration of a battery cell according to one embodiment of the present invention.

[0034] FIG. 4 is a cross-sectional view schematically showing the configuration of a battery cell according to one embodiment of the present invention.

[0035] FIG. 5 is a cross-sectional view schematically showing the upper part of the configuration of a battery cell according to one embodiment of the present invention.

[0036] FIG. 6 is a perspective view schematically showing a busbar assembly according to a first embodiment of the present invention.

[0037] FIG. 7 is a perspective view schematically showing a busbar assembly and an uncoupled holder part according to a first embodiment of the present invention.

[0038] FIG. 8 is a perspective view schematically showing a part of a busbar assembly according to a first embodiment of the present invention.

[0039] FIG. 9 is a perspective view schematically showing a holder portion uncoupled according to the first embodiment of the present invention.

[0040] FIG. 10 is a cross-sectional view of a busbar assembly according to a first embodiment of the present invention.

[0041] FIG. 11 is a perspective view schematically showing a part of a busbar assembly according to a second embodiment of the present invention.

[0042] FIG. 12 is a cross-sectional view of a busbar assembly according to a second embodiment of the present invention.

[0043] FIG. 13 is a perspective view schematically showing an elastic member disposed in a busbar assembly according to a first embodiment of the present invention.

[0044] FIG. 14 is a cross-sectional view schematically showing an elastic member disposed in a busbar assembly according to a first embodiment of the present invention.

[0045] FIG. 15 is a cross-sectional view schematically showing an elastic member disposed in a busbar assembly according to a second embodiment of the present invention.

[0046] FIG. 16 is a perspective view schematically showing a busbar assembly and an uncoupled holder part according to a third embodiment of the present invention.

[0047] FIG. 17 is a cross-sectional view schematically showing a busbar assembly and an uncoupled holder portion according to a third embodiment of the present invention.

[0048] FIGS. 18 to 20 are perspective views schematically illustrating a busbar assembly according to a fourth embodiment of the present invention.

[0049] FIG. 21 is a perspective view schematically showing a busbar assembly according to the fifth embodiment of the present invention.

[0050] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor may appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; thus, various equivalents and modifications that can replace them may exist at the time of filing this application. Furthermore, as used in this specification, "comprise" or "include" and / or "comprising" or "including" specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups. In addition, when describing embodiments of the present invention, "may" and "may be" may include "one or more embodiments of the present invention."

[0051] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0052] The statement that two subjects of comparison are 'identical' means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0053] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0054] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0055] The fact that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0056] Furthermore, where it is stated that one component is "connected," "coupled," or "connected" to another component, it should be understood that while said components may be directly connected or connected to each other, another component may be "interposed" between each component, or that each component may be "connected," "coupled," or "connected" through another component. Additionally, when it is stated that a part is electrically coupled with another part, this includes not only cases where they are directly connected but also cases where they are connected with an intermediate element in between.

[0057] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise. That is, "and / or" includes any combination or any combination of the enumerated items. "C to D" means C or more and D or less, unless specifically stated otherwise.

[0058] When syntax 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 of A, B, and C", or "at least one selected from A, B, and C" is used to specify a list of elements A, B, and C, the syntax can refer to any suitable combination.

[0059] The term "use" may be considered synonymous with the term "utilize." As used herein, "substantially," "about," and similar terms are used as terms of approximation rather than degree, and are intended to account for the inherent variation of measured or calculated values ​​that a person skilled in the art would recognize.

[0060] In this specification, terms such as first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or sections, but 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. Accordingly, the first element, component, region, layer, or section discussed below may be named the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0061] Spatial relative terms such as "beneath," "below," "lower," "above," and "upper" may be used herein for ease of explanation to describe the relationship between one element or feature and another element(s) or feature(s) as illustrated in the drawings. Spatially relative positions are to be understood as encompassing 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 drawing is inverted, an element described as "below" or "below" is understood as "above" or "upper" of another element. Thus, the term "below" may encompass both the up and down directions.

[0062] The terms used in this specification are intended to describe embodiments of the present disclosure and are not intended to limit the present disclosure.

[0063] In describing the present invention with reference to multiple embodiments below, the description of identical or corresponding components across multiple embodiments will be omitted to avoid duplication. For example, if a configuration identical to or corresponding to a configuration disclosed in one embodiment is disclosed in another embodiment, such configuration will be omitted from the description of the other embodiment, and the description will focus on the configuration that differs from the first embodiment.

[0064]

[0065] FIG. 1 is a perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention, and FIG. 2 is a plan view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0066] Referring to FIGS. 1 and 2, the battery pack (1) according to the present embodiment may include a housing (10), a battery cell (20), a busbar assembly (30), and a holder part (40).

[0067] The housing (10) forms the general outline of the battery pack (1) and can provide a space in which the battery cell (20) can be accommodated.

[0068] The housing (10) according to the present embodiment may include a housing body (11) and a cover (12).

[0069] The housing body (11) can be formed to have a box shape with an empty interior and one side open. The cross-sectional shape of the housing body (11) is not limited to the square shape shown in FIG. 1, but can be designed to have various shapes such as polygons, circles, and ellipses.

[0070] The first direction described below can be exemplified as the length direction of the housing body (11) being parallel to the Y-axis with respect to FIG. 1, the width direction of the housing body (11) being exemplified as the X-axis being exemplified as the height direction of the housing body (11) being exemplified as the Z-axis being exemplified as the height direction of the housing body (11).

[0071] The cover (12) is coupled to the housing body (11) and can close the internal space of the housing body (11). According to one embodiment, the cover (12) is formed to have a shape approximately like a plate and can be positioned to face the open side of the housing body (11). The cover (12) can be fixed to the housing body (11) by various types of coupling methods, such as bolting, welding, or snap-fitting.

[0072] The battery cell (20) can function as a unit structure for charging and discharging power from the battery pack (1). The battery cell (20) can be placed inside the housing (10). The central axis (C) of the battery cell (20) can be placed parallel to the height direction of the housing (10), that is, the Z-axis direction with respect to FIG. 1.

[0073] One or more battery cells (20) may be provided. In the following description, the battery cells (20) may be provided in multiple numbers. However, the battery pack (1) according to the present embodiment may also be configured to include only a single battery cell (20).

[0074] Multiple battery cells (20) can be arranged to form various patterns inside the housing (10). For example, multiple battery cells (20) can be arranged in two or more rows along the length and width directions of the housing (10). Multiple battery cells (20) can be arranged parallel to each other. The arrangement of multiple battery cells (20) is not limited to the arrangement shown in FIG. 2, and the design can be modified in various forms.

[0075] The busbar assembly (30) can electrically connect the battery cells (20). The busbar assembly (30) can connect the battery cells (20) in parallel and in series. The busbar assembly (30) can connect the battery cells (20) in series and in parallel.

[0076] The busbar assembly (30) may include a first busbar (31) and a second busbar (32).

[0077] The first busbar (31) can connect battery cells (20) in parallel, and the second busbar (32) can connect battery cells (20) in series. According to one embodiment, the second busbar (32) can connect battery cells (20) in series and in parallel.

[0078] The busbar assembly (30) may include a circuit board (33).

[0079] The circuit board (33) can be connected to the first busbar (31) and the second busbar (32). The circuit board (33) is connected to the first busbar (31) and the second busbar (32) to measure the voltage and current of the first busbar (31) and the second busbar (32).

[0080]

[0081] FIG. 3 is a perspective view schematically showing the configuration of a battery cell according to one embodiment of the present invention, FIG. 4 is a cross-sectional view schematically showing the configuration of a battery cell according to one embodiment of the present invention, and FIG. 5 is a cross-sectional view schematically showing the upper part of the configuration of a battery cell according to one embodiment of the present invention.

[0082] Referring to FIGS. 3 to 5, the battery cell (20) according to the present embodiment includes an electrode assembly (210), a case (220), and a terminal (230).

[0083] In the following description, the battery cell is described as a cylindrical battery as a lithium-ion secondary battery. However, the present invention is not limited thereto, and the battery cell may be a lithium polymer battery or a prismatic battery.

[0084] The electrode assembly (210) can function as a unit structure that performs charging and discharging operations of power in a battery cell.

[0085] The electrode assembly (210) may include a first electrode (211), a second electrode (212), and a separator (213) disposed between the first electrode (211) and the second electrode (212).

[0086] The electrode assembly (210) may have a shape wound around a winding axis.

[0087] More specifically, the electrode assembly (210) may have a shape in which the first electrode (211), the separator (213), and the second electrode (212) are stacked and wound along a clockwise or counterclockwise direction around a winding axis. Accordingly, the electrode assembly (210) may have a shape roughly resembling a jelly roll. The cross-sectional shape of the electrode assembly (210) can be designed to have various shapes, such as an ellipse or a polygon, in addition to a circular shape. The winding axis of the electrode assembly (210) may be positioned on the same straight line as the central axis (C) of the battery cell (20).

[0088] The first electrode (211) can function as the positive electrode of the electrode assembly (210). The first electrode (211) may be formed to have the form of a foil containing a metal material such as aluminum or an aluminum alloy. The type, size, and shape of the first electrode (211) are not particularly limited, as long as it is conductive without causing chemical changes in the battery cell.

[0089] A first active material layer may be applied to at least a portion of the first electrode (211). The first active material layer may be applied to both sides of the first electrode (211), or alternatively, it may be applied to only one side of the first electrode (211).

[0090] As the first electrode (211) functions as a positive electrode, the first active material layer may include a positive electrode active material.

[0091] The cathode active material may be a compound capable of reversible intercalation and deintercalation of lithium (a lithated intercalation compound). More specifically, one or more composite oxides of lithium and a metal selected from cobalt, manganese, nickel, iron, and combinations thereof may be used.

[0092] For example, the positive electrode active material may include at least one of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNixCoyMnzO2, NCM). Here, 0 <x<1, 0<y<1, 0<z<1, x+y+z=1을 만족할 수 있다. 양극 활물질은 리튬-철-인 산화물(LiFePO4, LFP), 리튬-망간-철-인 산화물(LiMnFePO4, LMFP), 리튬-니켈-코발트-망간 산화물(LiNixCoyMnzO2, NCM) 중 어느 하나만을 포함할 수 있고, 리튬-철-인 산화물(LiFePO4, LFP), 리튬-망간-철-인 산화물(LiMnFePO4, LMFP), 리튬-니켈-코발트-망간 산화물(LiNixCoyMnzO2, NCM)중 어느 두개 또는 이들을 모두 포함하는 것도 가능하다.

[0093] The first active material layer may further include a positive conductive material.

[0094] The positive electrode conductive material is used to impart conductivity to the first active material layer, and any electronically conductive material that does not cause chemical changes can be used. Examples of positive electrode conductive materials include carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc., metal-based materials in the form of metal powder or metal fibers containing copper, nickel, aluminum, silver, etc., or conductive polymers such as polyphenylene derivatives, or mixtures thereof.

[0095] The first active material layer may further include an anode binder.

[0096] The positive binder serves to adhere the particles constituting the positive active material well to each other and also to adhere the positive active material well to the first electrode (211).

[0097] Examples of positive binders may include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0098] Examples of the above-mentioned non-aqueous binders include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide imide, polyimide, or combinations thereof.

[0099] The above-mentioned water-based binder may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepichlorohydrin, polyphosphazene, poly(meth)acrylonitrile, ethylenepropylenediene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0100] When using a water-based binder as the anode binder, a cellulose-based compound capable of imparting viscosity may be further included. As this cellulose-based compound, one or more types such as carboxymethyl cellulose, hydroxypropylmethyl cellulose, methyl cellulose, or alkali metal salts thereof may be mixed and used. Na, K, or Li may be used as the alkali metal.

[0101] The above dry binder is a polymer material capable of fiberization, and may be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or a combination thereof.

[0102] The first electrode (211) may include a first blank portion (2111) in which the first active material layer is not coated. The first blank portion (2111) may protrude a predetermined distance from one end of the electrode assembly (210) along the winding axis.

[0103] The second electrode (212) can function as the negative electrode of the electrode assembly (210). The second electrode (212) may be formed to have the shape of a foil containing a metal material such as copper, a copper alloy, nickel, or a nickel alloy. The second electrode (212) may be positioned facing the first electrode (211) at a predetermined distance apart.

[0104] The second electrode (212) is not particularly limited in type, size, shape, etc., as long as it is conductive without causing chemical changes in the battery cell.

[0105] A second active material layer may be applied to at least a portion of the second electrode (212). The second active material layer may be applied to both sides of the second electrode (212), or alternatively, it may be applied to only one side of the second electrode (212).

[0106] As the second electrode (212) functions as a negative electrode, the second active material layer may include a negative active material.

[0107] The negative electrode active material may include a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0108] A material capable of reversibly intercalating / deintercalating the above lithium ions may be a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon include graphite such as amorphous, plate-like, flake-like, spherical, or fibrous natural graphite or artificial graphite, and examples of amorphous carbon include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0109] As the above lithium metal alloy, an alloy of lithium and a metal selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn may be used.

[0110] As materials capable of doping and undoping lithium, Si-based negative electrode active materials or Sn-based negative electrode active materials may be used. Si-based negative electrode active materials may be silicon, silicon-carbon composites, SiOx (0 < x < 2), Si-Q alloys (wherein Q is selected from alkali metals, alkaline earth metals, group 13 elements, group 14 elements (excluding Si), group 15 elements, group 16 elements, transition metals, rare earth elements, and combinations thereof), or combinations thereof. Sn-based negative electrode active materials may be Sn, SnO2, Sn-based alloys, or combinations thereof.

[0111] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles. For example, it may include a secondary particle (core) assembled from silicon primary particles and an amorphous carbon coating layer (shell) located on the surface of the secondary particle. The amorphous carbon may also be located between the silicon primary particles, so that, for example, the silicon primary particles may be coated with amorphous carbon. The secondary particles may be dispersed in an amorphous carbon matrix.

[0112] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles and an amorphous carbon coating layer located on the surface of the core.

[0113] The above Si-based or Sn-based negative electrode active material can be used in combination with a carbon-based negative electrode active material.

[0114] The second active material layer may further include a cathode conductive material and a cathode binder.

[0115] The cathode conductive material is used to impart conductivity to the second active material layer, and any electronically conductive material that does not cause chemical changes can be used. Examples of cathode conductive materials include carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc., metal-based materials in the form of metal powder or metal fibers containing copper, nickel, aluminum, silver, etc., or conductive polymers such as polyphenylene derivatives, or mixtures thereof.

[0116] The negative electrode binder serves to adhere the particles constituting the negative electrode active material well to each other and also to adhere the negative electrode active material well to the second electrode (212).

[0117] Examples of cathode binders may include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0118] Examples of the above-mentioned non-aqueous binders include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide imide, polyimide, or combinations thereof.

[0119] The above-mentioned water-based binder may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepichlorohydrin, polyphosphazene, poly(meth)acrylonitrile, ethylenepropylenediene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0120] When a water-based binder is used as the cathode binder, a cellulose-based compound capable of imparting viscosity may be further included. As this cellulose-based compound, one or more types such as carboxymethyl cellulose, hydroxypropylmethyl cellulose, methyl cellulose, or alkali metal salts thereof may be mixed and used. Na, K, or Li may be used as the alkali metal.

[0121] The above dry binder is a polymer material capable of fiberization, and may be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or a combination thereof.

[0122] The second electrode (212) may include a second blank portion (2121) on which the second active material layer is not applied. The second blank portion (2121) may protrude a predetermined distance from the other end of the electrode assembly (210) located on the opposite side of the first blank portion (2111) along the winding axis.

[0123] A separator (213) may be placed between the first electrode (211) and the second electrode (212). The separator (213) may perform the function of preventing a short circuit between the first electrode (211) and the second electrode (212) while allowing the movement of lithium ions between the first electrode (211) and the second electrode (212).

[0124] As such a separator (213), polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer membrane of two or more layers thereof may be used, and a mixed multilayer membrane such as a polyethylene / polypropylene two-layer separator, a polyethylene / polypropylene / polyethylene three-layer separator, or a polypropylene / polyethylene / polypropylene three-layer separator may be used.

[0125] The separator (213) may include a porous substrate and a coating layer comprising an organic material, an inorganic material, or a combination thereof located on one or both sides of the porous substrate.

[0126] The porous substrate may be a polymer membrane formed from any one of the following: polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate and polybutylene terephthalate; polyacetal; polyamide; polyimide; polycarbonate; polyetherketone; polyaryletherketone; polyetherimide; polyamideimide; polybenzimidazole; polyethersulfone; polyphenylene oxide; cyclic olefin copolymer; polyphenylene sulfide; polyethylene naphthalate; glass fiber; Teflon; and polytetrafluoroethylene, or a copolymer or mixture of two or more of these.

[0127] The above organic material may include a polyvinylidene fluoride-based polymer or a (meth)acrylic-based polymer.

[0128] The above inorganic material may include inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof, but is not limited thereto.

[0129] The above organic and inorganic materials may exist mixed in a single coating layer, or may exist in a stacked form with a coating layer containing organic materials and a coating layer containing inorganic materials.

[0130] The separator (213) may be provided in pairs. The pair of separator (213) may be positioned to face each other on both sides of the first electrode (211) or the second electrode (212). The pair of separator (213) may be wound together with the first electrode (211) and the second electrode (212) around a winding axis.

[0131] The case (220) forms the general appearance of the battery cell (20) and can accommodate the electrode assembly (210). The case (220) may be provided to be electrically conductive. For example, the case (220) may include at least one material among steel, stainless steel, aluminum, and aluminum alloy.

[0132] The case (220) may include a can (221) and a cap plate (224).

[0133] The can (221) may be formed to have a cylindrical shape with a roughly circular cross-section. The diameter of the can (221) may be larger than the diameter of the electrode assembly (210). The length of the can (221) parallel to the winding axis of the electrode assembly (210) may be larger than the length of the electrode assembly (210).

[0134] The electrode assembly (210) can be accommodated inside the can (221). The central axis of the can (221) can be positioned on the same straight line as the central axis (C) of the battery cell (20). The central axis of the can (221) can be positioned to be coaxial with the winding axis of the electrode assembly (210).

[0135] The can (221) may include a terminal plate (222) and an opening (223).

[0136] The terminal plate (222) and the opening (223) may be disposed at each end of the can (221). The terminal plate (222) and the opening (223) may be disposed spaced apart from each other along the winding axis of the electrode assembly (210).

[0137] The terminal plate (222) according to the present embodiment may be formed to have the shape of a disc placed at one end of the can (221). The terminal plate (222) may be positioned inside the housing body (11) so as to face the cover (12). The outer surface of the terminal plate (222) may be formed integrally with the inner surface of the can (221) to seal one end of the can (221). For example, the can (221) and the terminal plate (222) may be formed by a deep drawing process. Alternatively, the terminal plate (222) may be manufactured separately from the can (221), and its outer surface may be joined to the inner surface of the can (221). A through hole into which a terminal (230), described later, is inserted may be formed in the central part of the terminal plate (222).

[0138] The opening (223) according to the present embodiment may be formed to have the shape of a hole penetrating the other end of the can (221). The opening (223) may be positioned inside the housing body (11) so as to face the bottom surface of the housing body (11). Both sides of the opening (223) may be connected to the internal space of the can (221) and the external space of the can (221), respectively. During the manufacturing process of the battery cell (20), the electrode assembly (210) may be inserted into the interior of the can (221) through the opening (223) together with the electrolyte.

[0139] The first blank portion (2111) of the electrode assembly (210) may be positioned to face the terminal plate (222) inside the can (221). The second blank portion (2121) of the electrode assembly (210) may be positioned to face the opening (223) inside the can (221).

[0140] A case gasket (G3) that electrically insulates the electrode assembly (210) and the terminal plate (222) may be disposed between the electrode assembly (210) and the terminal plate (222). The case gasket (G3) can function as a component that electrically insulates the electrode assembly (210) and the terminal plate (222) by blocking direct contact between the case (220) and the first electrode (211).

[0141] The case gasket (G3) according to the present embodiment may be positioned between one side of the electrode assembly (210) having a first non-removable portion (2111) protruding and the inner side of the terminal plate (222) positioned to face the internal space of the can (221). The case gasket (G3) may be fixed to the inner side of the terminal plate (222) via an adhesive or the like. The case gasket (G3) may be formed from an insulating material such as rubber, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0142] The cap plate (224) can be configured to seal the opening (223) of the can (221).

[0143] The cap plate (224) according to the present embodiment may be formed to have a roughly disc shape. The cap plate (224) may be placed in the opening (223) of the can (221). The inner surface of the cap plate (224) may be positioned to face the other side of the electrode assembly (210) in which the second blank portion (2121) protrudes from the opening (223). The outer surface of the cap plate (224) may be positioned to face the external space of the can (221). The outer surface of the cap plate (224) may be positioned to face the bottom surface of the housing body (11) from inside the housing body (11). The cap plate (224) may be formed of a metal material to ensure mechanical rigidity, or alternatively, it may be formed of a synthetic resin material that does not have electrical conductivity.

[0144] The case (220) according to the present embodiment may further include a beading portion (225) and a crimping portion (226).

[0145] The beading portion (225) may refer to a portion of the can (221) that protrudes from the inner surface of the can (221) toward the central axis of the can (221) within the entire area of ​​the can (221). The beading portion (225) may be formed by pressing the outer surface of the can (221) from the side adjacent to the opening (223). The beading portion (225) may come into contact with the other end of the electrode assembly (210) on which the second beading portion (2121) protrudes. Accordingly, the beading portion (225) can prevent the electrode assembly (210) from moving or detaching from inside the can (221). The edge area of ​​the inner surface of the cap plate (224) may be positioned to face the other side of the electrode assembly (210) on which the second beading portion (2121) protrudes, with the beading portion (225) in between.

[0146] The crimping portion (226) may be placed at one end of the can (221) in which the opening (223) is formed. The crimping portion (226) may function as a component for securing the cap plate (224) in the opening (223).

[0147] The crimping portion (226) according to the present embodiment may be folded from one end of the can (221) that surrounds the opening (223). The crimping portion (226) may be positioned to face the outer surface of the cap plate (224) which is positioned to face the outer space of the can (221).

[0148] A cap gasket (G1) that electrically insulates the cap plate (224) and the case (220) may be placed between the cap plate (224) and the crimping portion (226).

[0149] The cap gasket (G1) according to the present embodiment may be positioned to completely wrap around the end of the cap plate (224). The outer surface of the cap gasket (G1) may be pressed and fixed to the inner surface of the beading portion (225) and the crimping portion (226). The cap gasket (G1) may be formed from an insulating material such as rubber, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. Accordingly, the cap gasket (G1) electrically insulates the cap plate (224) and the case (220) and can block moisture, foreign substances, etc. from entering between the cap plate (224) and the case (220).

[0150] The crimping portion (226) is positioned to face the other side of the cap plate (224) with the cap gasket (G1) in between, and can press the cap plate (224) toward the beading portion (225) by contacting the cap gasket (G1). Accordingly, the cap plate (224) can be stably fixed on the side of the opening (223) of the case (220).

[0151] The terminal (230) is coupled to the terminal plate (222) and may protrude outward from the terminal plate (222). The terminal (230) may be made of a metal material having electrical conductivity, such as aluminum, nickel, copper, etc.

[0152] The terminal (230) according to the present embodiment may penetrate the terminal plate (222) along the central axis (C) of the battery cell (20). The central axis of the terminal (230) may be positioned coaxially with the central axis (C) of the battery cell (20).

[0153] More specifically, the central portion of the terminal (230) can be inserted into the interior of a through hole formed in the terminal plate (222). The outer surface of the terminal (230) can be positioned at a predetermined distance from the inner surface of the through hole formed in the central portion of the terminal plate (222).

[0154] The upper and lower ends of the terminal (230) can be positioned in the inner and outer spaces of the can (221), respectively. The ends of the terminal (230) positioned in the inner and outer spaces of the can (221) are compressed and deformed by riveting and can be positioned to face the outer and inner surfaces of the terminal plate (222), respectively. Accordingly, the edge region of the terminal (230) can have a cross-sectional shape approximately U-shaped.

[0155] A terminal gasket (G2) that electrically insulates the terminal (230) and the case (220) may be placed between the terminal (230) and the case (220).

[0156] The terminal gasket (G2) according to the present embodiment may be arranged to completely surround the inner circumferential surface of the through hole formed in the terminal plate (222) and the outer and inner surfaces of the terminal plate (222) facing both ends of the terminal (230). Both sides of the terminal gasket (G2) may be in close contact with the surfaces of the terminal plate (222) and the terminal (230). The terminal gasket (G2) may be formed from an insulating material such as rubber, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0157] The terminal (230) can be electrically connected to the first electrode (211) of the electrode assembly (210). In this embodiment, as the first electrode (211) of the electrode assembly (210) is exemplified as a positive electrode, the terminal (230) can function as a positive electrode terminal of the battery cell (20).

[0158] For example, the terminal (230) can be connected to the first electrode (211) of the electrode assembly (210) by the first current collector (231).

[0159] The first current collector (231) may be disposed between the electrode assembly (210) and the terminal (230). The first current collector (231) may function as a component that electrically connects the electrode assembly (210) and the terminal (230).

[0160] The first current collector (231) according to the present embodiment may be positioned between one side of the electrode assembly (210) having a first non-removable portion (2111) protruding and the other end of the terminal (230) located in the internal space of the case (220). The first current collector (231) may be made of a metal material having electrical conductivity, such as aluminum, nickel, copper, etc.

[0161] The first current collector (231) may have a shape approximately like a disc. Both sides of the first current collector (231) may be in contact with the first blank portion (2111) and the terminal (230), respectively. The end of the first blank portion (2111) may be bent in a direction parallel to the first current collector (231) and connected to the lower surface of the first current collector (231) by laser welding, ultrasonic welding, etc. The upper surface of the first current collector (231) may be in contact with the lower surface of the terminal (230) protruding into the interior of the can (221) and connected to the lower surface of the first current collector (231) by laser welding, ultrasonic welding, etc. Accordingly, the first current collector (231) may provide an electrical connection between the electrode assembly (210) and the terminal (230).

[0162] The can (221) can be electrically connected to the second electrode (212) of the electrode assembly (210). In this embodiment, as the first electrode (211) of the electrode assembly (210) is exemplified as a positive electrode, the terminal plate (222) provided in the can (221) can function as a negative electrode terminal of the battery cell (20).

[0163] For example, the can (221) can be connected to the second electrode (212) of the electrode assembly (210) by the second current collector (232).

[0164] The second current collector (232) may be positioned between the electrode assembly (210) and the cap plate (224). The second current collector (232) may function as a component that electrically connects the electrode assembly (210) and the case (220). The second current collector (232) may be made of an electrically conductive metal material, such as aluminum, nickel, copper, etc.

[0165] The second current collector (232) according to the present embodiment may include a flat portion (2321) facing the other side of the electrode assembly (210) on which the second non-removable portion (2121) protrudes, and an extension portion (2322) extending from the flat portion (2321).

[0166] The upper surface of the flat portion (2321) facing the other side of the electrode assembly (210) may be connected to the second unwound portion (2121). The end of the second unwound portion (2121) may be bent in a direction parallel to the flat portion (2321) and connected to one side of the flat portion (2321) by welding or the like. The bending direction of the second unwound portion (2121) may be a direction toward the winding axis of the electrode assembly (210).

[0167] The extension portion (2322) may extend from the edge of the flat portion (2321) toward the cap plate (224). The extension portion (2322) may come into contact with the inner surface of the beading portion (225). The extension portion (2322) may be rounded or bent along the beading portion (225). The extension portion (2322) may be connected to the beading portion (225) by welding or the like. Accordingly, the case (220) and the second electrode (212) are electrically connected, and the terminal plate (222) can function as a negative terminal.

[0168] The extension portion (2322) may be formed in multiple numbers. The multiple extension portions (2322) may be spaced apart from each other along the edge of the planar portion (2321).

[0169] The terminal (230) can penetrate the terminal plate (222) along the central axis (C) of the battery cell (20). A terminal gasket (G2) can be placed between the terminal (230) and the terminal plate (222).

[0170] The central axis of the terminal plate (222) can be located coaxially with the central axis (C) of the battery cell (20).

[0171] The busbar assembly (30) may be positioned inside the housing (10) facing the terminal plate (222) and / or terminal (230).

[0172] The busbar assembly (30) can be electrically connected to the terminal plate (222) and / or terminal (230). The busbar assembly (30) can function as a configuration that electrically connects the terminal plates (222) and / or terminal (230) of a plurality of battery cells (20), or provides an electrical connection between the terminal plates (222) and / or terminal (230) and the control circuit of the battery pack (1) or an external power device.

[0173] The busbar assembly (30) may be provided in multiple numbers. Each busbar assembly (30) may be individually connected to the terminal plate (222) and / or terminal (230) of a different battery cell (20).

[0174] The busbar assembly (30) according to the present embodiment may have the form of a plate comprising at least one conductive metal among aluminum, nickel, and copper. The busbar assembly (30) may be formed to have a straight shape, and it may also have a bent structure having one or more bending sections.

[0175] The busbar assembly (30) is in contact with the upper surface of the terminal plate (222) and can be joined to the upper surface of the terminal plate (222) by welding or the like.

[0176] The busbar assembly (30) is in contact with the upper surface of the terminal (230) and can be joined to the upper surface of the terminal (230) by welding or the like.

[0177] The busbar assembly (30) can connect multiple battery cells (20) in parallel, in series, or in series and in parallel.

[0178]

[0179] FIG. 6 is a perspective view schematically showing a busbar assembly according to a first embodiment of the present invention, FIG. 7 is a perspective view schematically showing a busbar assembly and an uncoupled holder part according to a first embodiment of the present invention, FIG. 8 is a perspective view schematically showing a part of a busbar assembly according to a first embodiment of the present invention, FIG. 9 is a perspective view schematically showing the holder part according to a first embodiment of the present invention uncoupled, and FIG. 10 is a cross-sectional view of a busbar assembly according to a first embodiment of the present invention.

[0180] The busbar assembly (30) illustrated in FIGS. 6 to 10 is identical to the busbar assembly (30) illustrated in FIGS. 1 to 5. Therefore, descriptions of identical configurations may be omitted.

[0181] Referring to FIGS. 6 to 10, a busbar assembly (30) can be seen.

[0182] The busbar assembly (30) may include a first busbar (31) and a second busbar (e.g., the second busbar (32) of FIG. 21).

[0183] The first busbar (31) can electrically connect a plurality of battery cells (20). According to one embodiment, the first busbar (31) can connect the same poles (e.g., positive or negative) of the plurality of battery cells (20) to connect the plurality of battery cells (20) in parallel. The first busbar (31) can connect the negative poles of the plurality of battery cells (20) in parallel. More specifically, the first busbar (31) can be connected to the terminal plates (222) of the plurality of battery cells (20) to connect the plurality of battery cells (20) in parallel.

[0184] The second busbar (32) illustrated in FIG. 21 can electrically connect a plurality of battery cells (20). According to one embodiment, the second busbar (32) can connect the other poles of a plurality of battery cells (20) in series. The second busbar (32) can connect the positive pole of one battery cell (20) among the plurality of battery cells (20) and the negative pole of another battery cell (20) in series. More specifically, the second busbar (32) can connect the terminal (230) of one battery cell (20) among the plurality of battery cells (20) and the terminal plate (222) of another battery cell (20) in series.

[0185] The second busbar (32) can connect multiple battery cells (20) in series and parallel. The description of the second busbar (32) will be described later along with the description of FIG. 21.

[0186] Referring to FIGS. 6 to 10, the first busbar (31) will be described.

[0187] The first busbar (31) may include a busbar body (300), a busbar circuit connection part (301), a busbar step part (302), a busbar contact part (303), a bending part (310), and a holder part (320).

[0188] The busbar body (300) can connect multiple battery cells (20).

[0189] The battery cell (20) may include a first electrode terminal and a second electrode terminal. According to one embodiment, the first electrode terminal may be provided as a terminal (230) that performs a positive electrode function, and the second electrode terminal may be provided as a terminal plate (222) that performs a negative electrode function. Alternatively, the first electrode terminal may be provided as a terminal (230) that performs a negative electrode function, and the second electrode terminal may be provided as a terminal plate (222) capable of performing a positive electrode function.

[0190] The first busbar (31) can electrically connect each first electrode terminal of a plurality of battery cells (20) to connect the battery cells (20) in parallel. Alternatively, the first busbar (31) can electrically connect each second electrode terminal of a plurality of battery cells (20) to connect the battery cells (20) in parallel.

[0191] The busbar body (300) can connect two or more battery cells (20) in parallel. According to one embodiment, the busbar body (300) can connect three battery cells (20) in parallel.

[0192] The busbar body (300) may include a metal material such as copper, copper alloy, nickel, or nickel alloy.

[0193] The shape of the busbar body (300) can be approximately in the shape of a 'T' or a 'U'. The shape of the busbar body (300) is not limited to a 'T' or a 'U' shape and may vary depending on the arrangement of the battery cell (20).

[0194] The busbar body (300) may include a busbar circuit connection part (301) connected to a circuit board (33). The busbar body (300) may be connected to the circuit board (33) through the busbar circuit connection part (301), and the circuit board (33) may be connected to the busbar body (300) to obtain information of the battery cell (20), such as the voltage, current, and / or temperature of the battery cell (20).

[0195] The busbar body (300) may include a busbar step portion (302). The busbar step portion (302) may be bent. The busbar step portion (302) may be positioned between the busbar circuit connection portion (301) and the busbar contact portion (303). Accordingly, even if the height of the busbar contact portion (303) and the height of the circuit board (33) are different, the height difference can be compensated by the busbar step portion (302).

[0196] The part where the busbar body (300) and the battery cell (20) are electrically connected can be defined as a busbar contact part (303). Multiple busbar contact parts (303) may be provided.

[0197] The busbar contact portion (303) can be connected to the terminal plate (222) and / or terminal (230) of the battery cell (20). The busbar contact portion (303) can be joined to the terminal plate (222) and / or terminal (230) in various ways, such as thermal fusion, laser welding, etc.

[0198] According to one embodiment, the busbar contact portion (303) is connected to the terminal plate (222) of a plurality of battery cells (20) so that the battery cells (20) can be connected in parallel.

[0199] According to another embodiment, the busbar contact portion (303) is connected to the terminals (230) of a plurality of battery cells (20) to connect the battery cells (20) in parallel.

[0200] The busbar body (300) may include a bending portion (310) that is bent. The bending portion (310) may be positioned between the busbar contact portions (303). The shape of the bending portion (310) may be approximately a 'C' shape, an 'S' shape, or a 'U' shape. As the bending portion (310) is provided in the busbar body (300), the bending portion (310) can absorb vibrations, deformations, and / or shocks occurring in the battery pack (1).

[0201] Additionally, since a bending portion (310) is provided in the busbar body (300), even if a change in distance occurs between the busbar contact portion (303) connected to the adjacent battery cell (20) due to swelling of the battery cell (20), the bending portion (310) can be deformed to compensate for the change in distance.

[0202] The bending portion (310) may be formed to protrude toward one side, and the other side may be formed concavely. According to one embodiment, a portion of the bending portion (310) formed concavely may be defined as a bending concave portion (313). A holder spacing projection (3211) of the holder portion (320) may be inserted into the bending concave portion (313). As the holder spacing projection (3211) is inserted into the bending concave portion (313), the holder portion (320) may be fixed to the bending portion (310).

[0203] The bending part (310) may include a first bending part (311) and a second bending part (312).

[0204] The first bending portion (311) can be positioned on one side of the bending concave portion (313), and the second bending portion (312) can be positioned on the other side of the bending concave portion (3130).

[0205] The height of the first bending part (311) and the height of the second bending part (312) may be the same (see FIG. 10). Alternatively, the height of the first bending part (311) and the height of the second bending part (312) may be different (see FIG. 12). Depending on the arrangement of the battery cell (20), the height of the first bending part (311) and the height of the second bending part (312) may be the same or different.

[0206] The holder portion (320) may be disposed on the busbar body (300). According to one embodiment, the holder portion (320) may be disposed on the bending portion (310). The holder portion (320) may be disposed to contact the bending portion (310) to reduce impact and / or external force transmitted to the bending portion (310). Accordingly, the bending portion (310) may be protected by the holder portion (320).

[0207] The holder portion (320) may be injection molded. The holder portion (320) may include an insulating material. According to one embodiment, the holder portion (320) may include plastic.

[0208] The holder portion (320) may include a lower holder portion (321) and an upper holder portion (322). The lower holder portion (321) and the upper holder portion (322) may be disposed on both sides of the busbar body (300). According to one embodiment, the lower holder portion (321) may be disposed on the lower surface of the busbar body (300), and the upper holder portion (322) may be disposed on the upper surface of the busbar body (300). The lower holder portion (321) and the upper holder portion (322) may be disposed on the lower and upper surfaces of the busbar body (300) and combined with each other. Accordingly, the holder portion (320) may be fixed to the busbar body (300).

[0209] The holder portion (320) may include a holder spacing projection (3211) provided as a projection protruding from the lower holder portion (321). The holder spacing projection (3211) may come into contact with the bending portion (310). The holder spacing projection (3211) may be positioned between the first part (311) and the second part (312) of the bending portion. The holder spacing projection (3211) may be inserted into the bending recess (313). The holder spacing projection (3211) may come into contact with the bending portion (310) by being inserted into the bending recess (313). Additionally, as the holder spacing projection (3211) is inserted into the bending recess (313), the position of the bending portion (310) may be guided to a specific position.

[0210] The holder portion (320) may include an upper holder recess (3221) provided as a groove formed concavely in the upper holder portion (322). A bending portion (310) may be received in the upper holder recess (3221). As the bending portion (310) is placed in the upper holder recess (3221) provided as a concave groove, the bending portion (310) may not be deformed.

[0211] The holder portion (320) may include a hinge portion (330) connecting the lower holder portion (321) and the upper holder portion (322).

[0212] The hinge portion (330) can connect the lower holder portion (321) and the upper holder portion (322), and the lower holder portion (321) and the upper holder portion (322) can rotate around the hinge portion (330). In this way, as the lower holder portion (321) and the upper holder portion (322) rotate around the hinge portion (330), the holder portion (320) can be easily attached and detached from the busbar body (300).

[0213] The holder portion (320) may include a connecting portion (340) that connects the lower holder portion (321) and the upper holder portion (322).

[0214] The fastening portion (340) may include a fastening groove (341) and a fastening projection (342). The fastening groove (341) may be provided as a concave groove in the holder portion (320), and the fastening projection (342) may be provided as a projection protruding from the holder portion (320). The fastening projection (342) may be placed in the fastening groove (341) and coupled thereto. The fastening projection (342) may be provided in the shape of a hook. The fastening projection (342) provided in the shape of a hook may be inserted into the fastening groove (341) and fixed thereto.

[0215] According to one embodiment, the fastening groove (341) may be placed in the lower holder portion (321), and the fastening projection (342) may be placed in the upper holder portion (322). The lower holder portion (321) and the upper holder portion (322) may rotate around the hinge portion (330) so that the fastening projection (342) can be inserted into the fastening groove (341). Accordingly, the lower holder portion (321) and the upper holder portion (322) can be fixed.

[0216] According to another embodiment, the fastening groove (341) may be placed in the upper holder portion (322), and the fastening projection (342) may be placed in the lower holder portion (321).

[0217]

[0218] FIG. 11 is a perspective view schematically showing a part of a busbar assembly according to a second embodiment of the present invention, and FIG. 12 is a cross-sectional view of a busbar assembly according to a second embodiment of the present invention.

[0219] Referring to FIGS. 11 and 12, a busbar assembly (30) according to a second embodiment is described.

[0220] The height of the first bending part (311) and the height of the second bending part (312) can be formed differently.

[0221] According to one embodiment, the height of the first bending part (311) may be formed higher than the height of the second bending part (312). According to another embodiment, the height of the first bending part (311) may be formed lower than the height of the second bending part (312).

[0222] As the height of the first bending part (311) and the height of the second bending part (312) are formed differently, the busbar body (300) can electrically connect battery cells (20) of different heights.

[0223] The height of the holder portion (320) in contact with the busbar body (300) may be formed differently. The height of the holder portion (320) in contact with the first bending portion (311) may be formed differently from the height of the holder portion (320) in contact with the second bending portion (312).

[0224] The height of the holder part (320) in contact with the first bending part (311) can be formed to correspond to the height of the first bending part (311), and the height of the holder part (320) in contact with the second bending part (312) can be formed to correspond to the height of the second bending part (312).

[0225] According to one embodiment, the height of the lower holder part (321) and the upper holder part (322) in contact with the first bending part (311) may be formed to correspond to the height of the first bending part (311), and the height of the lower holder part (321) and the upper holder part (322) in contact with the second bending part (312) may be formed to correspond to the height of the second bending part (312).

[0226]

[0227] FIG. 13 is a perspective view schematically showing an elastic member disposed in a busbar assembly according to a first embodiment of the present invention, FIG. 14 is a cross-sectional view schematically showing an elastic member disposed in a busbar assembly according to a first embodiment of the present invention, and FIG. 15 is a cross-sectional view schematically showing an elastic member disposed in a busbar assembly according to a second embodiment of the present invention.

[0228] Referring to FIGS. 13 to 15, the busbar assembly (30) may include an elastic member (350) disposed in a holder portion (320).

[0229] The elastic member (350) is positioned between the holder part (320) and the busbar body (300) and can press the busbar body (300).

[0230] According to one embodiment, the elastic member (350) may be positioned between the busbar body (300) and the upper holder portion (322). Accordingly, the elastic member (350) may press the busbar body (300) toward the lower holder portion (321).

[0231] According to another embodiment, the elastic member (350) may be positioned between the busbar body (300) and the lower holder portion (321). Accordingly, the elastic member (350) may press the busbar body (300) toward the upper holder portion (322).

[0232] According to another embodiment, the elastic member (350) may be positioned between the busbar body (300) and the upper holder part (322) and between the busbar body (300) and the lower holder part (321).

[0233] In this way, as the elastic member (350) is placed in the holder portion (320), the holder portion (320) can be placed on the busbar body (300) while minimizing deformation of the busbar body (300).

[0234]

[0235] FIG. 16 is a perspective view schematically showing a busbar assembly and an uncoupled holder portion according to a third embodiment of the present invention, and FIG. 17 is a cross-sectional view schematically showing a busbar assembly and an uncoupled holder portion according to a third embodiment of the present invention.

[0236] Referring to FIGS. 16 and 17, the holder portion (320) may include a lower holder portion (321) and an upper holder portion (322).

[0237] The lower holder portion (321) and the upper holder portion (322) may be combined or separated from each other. According to one embodiment, a fastening portion (340) is disposed on the holder portion (320) so that the lower holder portion (321) and the upper holder portion (322) can be combined and separated from each other.

[0238] The fastening portion (340) may include a fastening groove (341) and a fastening projection (342).

[0239] According to one embodiment, a plurality of fastening grooves (341) may be provided in the lower holder portion (321), and a plurality of fastening protrusions (342) may be provided in the upper holder portion (322). The fastening protrusions (342) disposed in the upper holder portion (322) may be inserted into the fastening grooves (341) disposed in the lower holder portion (321) so that the holder portion (320) can be fixed to the busbar body (300).

[0240] According to another embodiment, a plurality of fastening protrusions (342) may be provided on the lower holder portion (321), and a plurality of fastening grooves (341) may be provided on the upper holder portion (322). The fastening protrusions (342) disposed on the lower holder portion (321) may be inserted into the fastening grooves (341) disposed on the upper holder portion (322) so that the holder portion (320) can be fixed to the busbar body (300).

[0241]

[0242] FIGS. 18 to 20 are perspective views schematically illustrating a busbar assembly according to a fourth embodiment of the present invention.

[0243] Referring to FIGS. 18 to 20, the busbar assembly (30) may further include a holder connecting body (3200).

[0244] A plurality of holder parts (320) may be disposed on the holder connecting body (3200). According to one embodiment, a plurality of holder parts (320) may be disposed on and fixed to the holder connecting body (3200). As such, as a plurality of holder parts (320) are fixed to the holder connecting body (3200), the stability of the busbar body (300) can be improved.

[0245] According to one embodiment, the holder connecting body (3200) may be connected to a lower holder portion (321). The holder connecting body (3200) may be connected to a plurality of lower holder portions (321). A busbar body (300) may be disposed on a plurality of lower holder portions (321), and an upper holder portion (322) may be coupled to each of the plurality of lower holder portions (321).

[0246] According to another embodiment, the holder connecting body (3200) may be connected to an upper holder portion (322). The holder connecting body (3200) may be connected to a plurality of upper holder portions (322). A busbar body (300) may be disposed on a plurality of upper holder portions (322), and a lower holder portion (321) may be coupled to each of the plurality of upper holder portions (322).

[0247] According to one embodiment, the lower holder portion (321) may be connected to the upper holder portion (322) by a hinge portion (330) (see FIGS. 6 to 15).

[0248] According to another embodiment, the lower holder portion (321) can be combined with the upper holder portion (322) by the fastening portion (340) (see FIGS. 6 to 17).

[0249]

[0250] FIG. 21 is a perspective view schematically showing a busbar assembly according to the fifth embodiment of the present invention.

[0251] Referring to FIG. 21, a second bus bar (32) connecting multiple battery cells (20) in series and parallel can be seen.

[0252] The second busbar (32) can connect multiple battery cells (20) in series and in parallel.

[0253] The second busbar (32) may include a busbar body (300), a busbar circuit connection part (301), a busbar step part (302), a busbar contact part (303), a bending part (310), and a holder part (320).

[0254] Descriptions of the configuration of the second busbar (32) that overlap with the configuration of the first busbar (31) may be omitted.

[0255] The shape of the busbar body (300) is not limited to the shape shown in FIG. 21 and can be provided in various shapes.

[0256] A busbar contact portion (303) may be provided on the busbar body (300). The busbar contact portion (303) may contact the first electrode terminal (e.g., positive terminal, 230)) and the second electrode terminal (e.g., negative terminal, 222)) of the battery cell (20). According to one embodiment, the busbar contact portion (303) may be electrically connected by being coupled with the first electrode terminal and / or the second electrode terminal of the battery cell (20).

[0257] The busbar contact portion (303) may include a busbar first electrode terminal contact portion (303-1) and a busbar second electrode terminal contact portion (303-2).

[0258] According to one embodiment, the busbar first electrode terminal contact portion (303-1) can contact the terminal (230) of the battery cell (20), and the busbar second electrode terminal contact portion (303-2) can contact the terminal plate (222) of the battery cell (20).

[0259] The terminal plate (222) can be positioned higher than the terminal (230).

[0260] A busbar step portion (302) forming a height difference may be provided in the busbar body (300). The busbar second electrode terminal contact portion (303-2) may be positioned lower than the busbar first electrode terminal contact portion (303-1) by the busbar step portion (302).

[0261] As the busbar step portion (302) is provided in the busbar body (300), a height difference can be formed between the busbar first electrode terminal contact portion (303-1) and the busbar second electrode terminal contact portion (303-2). Accordingly, the busbar first electrode terminal contact portion (303-1) can contact the first electrode terminal (e.g., terminal (230)) of the battery cell (20), and the busbar second electrode terminal contact portion (303-2) can contact the second electrode terminal (e.g., terminal plate (222)) of the battery cell (20).

[0262] A bending portion (310) may be disposed in a part of the busbar body (300) between the busbar first electrode terminal contact portion (303-1) and the busbar second electrode terminal contact portion (303-2), and a holder portion (320) may be disposed in the bending portion (310).

[0263] A bending portion (310) may be disposed in a part of the busbar body (300) between two busbar first electrode terminal contact portions (303-1), and a holder portion (320) may be disposed in the bending portion (310).

[0264] A bending portion (310) may be disposed in a part of the busbar body (300) between two busbar second electrode terminal contact portions (303-2), and a holder portion (320) may be disposed in the bending portion (310).

[0265] The busbar first electrode terminal contact portion (303-1) may include aluminum. The busbar first electrode terminal contact portion (303-1) including aluminum may contact the first electrode terminal (e.g., terminal (230)) of the battery cell (20).

[0266]

[0267] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0268] Therefore, the technical scope of protection of the present invention should be determined by the following patent claims.

Claims

1. A busbar body having a bending portion formed to be electrically connected to a plurality of battery cells and bent; and A busbar assembly characterized by including a holder portion disposed on the busbar body and fixed to the bending portion.

2. In Paragraph 1, A busbar assembly characterized by the above-mentioned busbar body connecting a plurality of the above-mentioned battery cells in parallel.

3. In Paragraph 1, A busbar assembly characterized by the above-mentioned busbar body connecting a plurality of the above-mentioned battery cells in series.

4. In Paragraph 1, The above-described busbar body is a busbar assembly characterized by connecting a plurality of the above-described battery cells in series and parallel.

5. In Paragraph 1, A busbar assembly characterized in that the height of the first bending part of the above-mentioned bending part is different from the height of the second bending part.

6. In Paragraph 1, The above holder part is, A lower holder portion in contact with the lower part of the busbar body; and A busbar assembly characterized by including an upper holder portion that contacts the upper part of the busbar body and is coupled to the lower holder portion.

7. In Paragraph 6, A busbar assembly characterized by further including a hinge portion that connects the upper holder portion to rotate relative to the lower holder portion.

8. In Paragraph 6, A busbar assembly characterized by further including a fastening portion connecting the lower holder portion and the upper holder portion, wherein the holder portion comprises: a lower holder portion and an upper holder portion.

9. In Paragraph 8, The above fastening part is, A fastening groove formed as a concave groove in the holder portion; and A busbar assembly characterized by including a fastening projection that protrudes from the holder portion and is inserted into the fastening groove.

10. In Paragraph 6, A busbar assembly characterized in that the holder portion further includes a holder spacing projection protruding from the lower holder portion, inserted into the bending portion, and arranged to contact the bending portion.

11. In Paragraph 1, A busbar assembly further comprising an elastic member disposed between the busbar body and the holder portion and pressing the holder portion.

12. In Paragraph 1, A busbar assembly characterized by further including a holder connecting body that connects a plurality of the aforementioned holder parts provided in a plurality.

13. Housing; A plurality of battery cells disposed inside a housing; and A busbar assembly for electrically connecting a plurality of the above battery cells; including, The above busbar assembly is, A busbar body having a bending portion formed to be electrically connected to a plurality of battery cells and formed to be bent; and A battery pack characterized by including a holder portion disposed on the busbar body and fixed to the bending portion.

14. In Paragraph 13, A battery pack characterized by the above-mentioned busbar body connecting a plurality of the above-mentioned battery cells in parallel.

15. In Paragraph 13, A battery pack characterized by the above-mentioned busbar body connecting a plurality of the above-mentioned battery cells in series.

16. In Paragraph 13, A battery pack characterized by the above-mentioned busbar body connecting a plurality of the above-mentioned battery cells in series and parallel.

17. In Paragraph 13, A battery pack characterized in that the height of the first bending part of the above bending part is different from the height of the second bending part.

18. In Paragraph 13, The above holder part is, A lower holder portion in contact with the lower part of the busbar body; and A battery pack characterized by including an upper holder portion that contacts the upper part of the busbar body and is coupled to the lower holder portion.

19. In Paragraph 18, The above holder part further includes a fastening part connecting the lower holder part and the upper holder part; The above fastening part is, A fastening groove formed as a concave groove in the holder portion; and A battery pack characterized by including a fastening projection that protrudes from the holder portion and is inserted into the fastening groove.

20. In Paragraph 13, A battery pack characterized by further including a holder connecting body that connects a plurality of holder portions provided in a plurality of the above-mentioned busbar assembly.

Images