Busbar assembly and battery pack comprising same

Abstract

The present disclosure relates to a busbar assembly and a battery pack comprising same. The technical problem is to be solved by providing a busbar assembly with improved flatness, and a battery pack comprising same. To this end, the present disclosure provides the busbar assembly comprising: a first electrode parallel busbar for connecting, in parallel, first electrode terminals provided in two or more first electrode end battery cells from among a plurality of battery cells having first electrode terminals and second electrode terminals; a second electrode parallel busbar for connecting, in parallel, the second electrode terminals provided in two or more second electrode end battery cells from among the plurality of battery cells; and one or more series-parallel busbars for connecting, in series-parallel, the second electrode terminals provided in two or more battery cells to which the first electrode terminals are connected in parallel from among the plurality of battery cells, and the first electrode terminals provided in two or more battery cells to which the second electrode terminals are connected in parallel from among the plurality of battery cells.

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, and there is a height difference between the location where the positive electrode is placed and the location where the negative electrode is placed in the battery cell.

[0004] 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.

[0005] The purpose of the present invention is to provide a busbar assembly and a battery pack capable of compensating for the height difference between the positive and negative terminals of a battery cell.

[0006] 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.

[0007] A busbar assembly according to the present invention for solving the above technical problem comprises: a first electrode parallel busbar connecting in parallel the first electrode terminals provided in two or more first electrode end battery cells among a plurality of battery cells having a first electrode terminal and a second electrode terminal; a second electrode parallel busbar connecting in parallel the second electrode terminals provided in two or more second electrode end battery cells among the plurality of battery cells; and one or more series-parallel busbars connecting in series the second electrode terminals provided in two or more battery cells among the plurality of battery cells in which the first electrode terminals are connected in parallel, and the first electrode terminals provided in two or more battery cells among the plurality of battery cells in which the second electrode terminals are connected in parallel.

[0008] The above series-parallel busbar can be connected to the second electrode terminal provided in the first electrode end battery cell.

[0009] The above series-parallel busbar can be connected to the first electrode terminal provided in the second electrode end battery cell.

[0010] The above series-parallel busbar includes a first series-parallel busbar and a second series-parallel busbar, and the first series-parallel busbar can parallel connect the first electrode terminal of the battery cell, the second electrode terminal of which is parallelly connected by the second series-parallel busbar.

[0011] The first electrode parallel busbar, the second electrode parallel busbar, and the series-parallel busbar may include a substrate contact portion connected to a circuit board.

[0012] The first electrode parallel busbar and the series-parallel busbar may include a first electrode terminal contact portion that contacts the first electrode terminal and includes a first metal, and the second electrode parallel busbar and the series-parallel busbar may include a second electrode terminal contact portion that contacts the second electrode terminal and includes a second metal different from the first metal.

[0013] At least one of the first electrode parallel busbar, the second electrode parallel busbar, and the series-parallel busbar may include a busbar body; and a bending part disposed on the busbar body and formed such that the space between one side of the bending part and the other side of the bending part is bent.

[0014] The height of one side of the bending part and the height of the other side of the bending part may be different from each other.

[0015] The bending portion may further include a bending bridge disposed on the busbar body and formed concavely; and a bending slit formed as a hole penetrating the bending bridge.

[0016] The first electrode parallel busbar can connect three first electrode end battery cells in parallel, the second electrode parallel busbar can connect three second electrode end battery cells in parallel, and the series-parallel busbar can connect three of the battery cells in parallel.

[0017] A battery pack according to the present invention for solving the above technical problem comprises: a holder portion including a lower holder and an upper holder; a first group battery cell disposed between the lower holder and the upper holder and having a plurality of battery cells including a first electrode terminal and a second electrode terminal; and a first busbar assembly disposed in the upper holder and electrically connecting the battery cells of the first group battery cell; wherein the first busbar assembly comprises: a first electrode parallel busbar connecting the first electrode terminals provided in parallel to two or more first electrode end battery cells among the plurality of battery cells; and a second electrode parallel busbar connecting the second electrode terminals provided in parallel to two or more second electrode end battery cells among the plurality of battery cells. and includes the second electrode terminals provided in two or more battery cells in which the first electrode terminals among the plurality of battery cells are connected in parallel, and one or more series-parallel busbars connecting the first electrode terminals provided in two or more battery cells in which the second electrode terminals among the plurality of battery cells are connected in parallel in series-parallel.

[0018] It may include: a second group battery cell disposed between the lower holder and the upper holder and having a plurality of battery cells including a first electrode terminal and a second electrode terminal; and a second busbar assembly disposed in the upper holder, electrically connecting the battery cells of the second group battery cell and having a first electrode parallel busbar, a second electrode parallel busbar and a series-parallel busbar.

[0019] It may further include a circuit board that is disposed in the upper holder and has a circuit board connection portion to which the first busbar assembly and the second busbar assembly are connected, and which connects the first busbar assembly and the second busbar assembly in series.

[0020] The upper holder may include an upper holder body; and an upper holder seating groove formed as a concave groove in the upper holder body, into which the first busbar assembly and the second busbar assembly are disposed.

[0021] The upper holder may further include an upper holder mounting projection that is disposed in the upper holder mounting groove and protrudes from the upper holder body and is inserted into a bending recess formed concavely in the first busbar assembly or the second busbar assembly.

[0022] The upper holder may include an upper holder body; and an upper holder terminal hole that penetrates the upper holder body and exposes the battery cell.

[0023] At least one of the first electrode parallel busbar, the second electrode parallel busbar, and the series-parallel busbar may include a busbar body; and a bending part disposed on the busbar body and formed such that the space between one side of the bending part and the other side of the bending part is bent.

[0024] The height of one side of the bending part and the height of the other side of the bending part may be different from each other.

[0025] The bending portion may further include a bending bridge disposed on the busbar body and formed concavely; and a bending slit formed as a hole penetrating the bending bridge.

[0026] The first electrode parallel busbar can connect three first electrode end battery cells in parallel, the second electrode parallel busbar can connect three second electrode end battery cells in parallel, and the series-parallel busbar can connect three of the battery cells in parallel.

[0027] The height difference between the terminals of the battery cells can be compensated through the busbar assembly according to the present invention and the battery pack including the same.

[0028] In addition, the flatness of the welded surface of a battery cell can be improved through the busbar assembly according to the present invention and the battery pack including the same.

[0029] 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.

[0030] FIG. 1 is a perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0031] FIG. 2 is an exploded perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0032] FIG. 3 is a plan view of a part of a battery pack according to one embodiment of the present invention.

[0033] FIG. 4 is a perspective view of a battery cell according to one embodiment of the present invention.

[0034] FIG. 5 is a cross-sectional view schematically showing the configuration of a battery cell according to one embodiment of the present invention.

[0035] FIG. 6 is a cross-sectional view schematically showing the configuration of a battery cell according to one embodiment of the present invention.

[0036] FIG. 7 is a perspective view of a holder part, a busbar assembly, and a circuit board according to one embodiment of the present invention.

[0037] FIG. 8 is an exploded perspective view of a holder part, a busbar assembly, and a circuit board according to one embodiment of the present invention.

[0038] FIG. 9 is a perspective view of a circuit board and a busbar assembly according to one embodiment of the present invention.

[0039] FIG. 10 is a cross-sectional perspective view of a part of a holder portion and a battery cell according to one embodiment of the present invention.

[0040] FIG. 11 is a cross-sectional perspective view of a part of a holder portion and a busbar assembly according to one embodiment of the present invention.

[0041] FIG. 12 is a plan view of a first electrode parallel bus bar according to one embodiment of the present invention.

[0042] FIG. 13 is a plan view of a second electrode parallel bus bar according to one embodiment of the present invention.

[0043] FIG. 14 is a plan view of a series-parallel busbar according to one embodiment of the present invention.

[0044] FIG. 15 is a perspective view of a first embodiment of a first electrode terminal contact portion according to the present invention.

[0045] FIG. 16 is a perspective view of a second embodiment of a first electrode terminal contact portion according to the present invention.

[0046] FIG. 17 is a perspective view of a third embodiment of a first electrode terminal contact portion according to the present invention.

[0047] FIG. 18 is a perspective view of a first embodiment of a bending portion of a busbar assembly according to the present invention.

[0048] FIG. 19 is a perspective view of a second embodiment of the bending portion of a busbar assembly according to the present invention.

[0049] FIG. 20 is a perspective view of a third embodiment of the bending portion of a busbar assembly according to 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, FIG. 2 is an exploded perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention, and FIG. 3 is a plan view of a part of a battery pack according to one embodiment of the present invention.

[0066] Referring to FIGS. 1 to 3, the battery pack (1) according to the present embodiment may include a housing (10), a battery cell (20), a holder part (30), a busbar assembly (40), and a circuit board (50).

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

[0068] The housing (10) according to the present embodiment may include a housing body (11) and a housing 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 housing 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 housing 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 housing cover (12) can be fixed to the housing body (11) by various types of coupling methods, such as bolting, welding, or snap-fitting.

[0072] A battery cell (20) can function as a unit structure for charging and discharging power from a battery pack (1). The battery cell (20) can be placed inside a 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. According to one embodiment, a plurality of battery cells (20) can be placed inside the housing (10).

[0073] One or more battery cells (20) may be provided. Below, the battery cells (20) may be provided in multiple numbers as an example.

[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 arrangements shown in FIGS. 1 to 3, and the design can be modified in various forms.

[0075] According to one embodiment, a plurality of battery cells (20) may comprise a first group of battery cells (21) and a second group of battery cells (22). The first group of battery cells (21) and the second group of battery cells (22) may be electrically connected by a circuit board (50). According to one embodiment, the first group of battery cells (21) and the second group of battery cells (22) may be connected in series, in parallel, and / or in series and parallel by the circuit board (50). According to one embodiment, a circuit board (50) may be placed between the first group of battery cells (21) and the second group of battery cells (22).

[0076] The first group battery cells (21) and the second group battery cells (22) may have three battery cells (20) connected in parallel, and the three battery cells (20) connected in parallel may form a group and be connected in series with the battery cells (20) of another group. Accordingly, each of the first group battery cells (21) and the second group battery cells (22) may include 21 battery cells (20) and may be arranged in the form of 7s3p (7 in series, 3 in parallel). The arrangement of the first group battery cells (21) and the second group battery cells (22) in the form of 7s3p is merely one embodiment, and the battery cells (20) may be connected in various series and parallel forms.

[0077] According to one embodiment, the battery cell (20) may include a first electrode end battery cell (20-1), a second electrode end battery cell (20-2), and a series-parallel battery cell (20-3).

[0078] The first electrode end battery cell (20-1) can be defined as a battery cell (20) connected by the first electrode parallel bus bar (41).

[0079] The second electrode end battery cell (20-2) can be defined as a battery cell (20) connected by the second electrode parallel bus bar (942).

[0080] A series-parallel battery cell (20-3) can be defined as a battery cell (20) excluding the first electrode end battery cell (20-1) and the second electrode end battery cell (20-2) among a plurality of battery cells (20).

[0081] The first electrode terminal (e.g., positive terminal, terminal (230) of FIG. 6) of the first electrode terminal battery cell (20-1) can be connected in parallel by the first electrode parallel bus bar (41).

[0082] The second electrode terminal (e.g., negative terminal, terminal plate (222) of FIG. 6) of the first electrode terminal battery cell (20-1) can be connected in parallel by a series-parallel bus bar (43) and can be connected in series with the first electrode terminal of the series-parallel battery cell (20-3).

[0083] The second electrode terminal of the second electrode end battery cell (20-2) can be connected in parallel by the second electrode parallel bus bar (42).

[0084] The first electrode terminal of the second electrode terminal battery cell (20-2) can be connected in parallel by a series-parallel bus bar (43) and can be connected in series with the second electrode terminal of the series-parallel battery cell (20-3).

[0085] According to one embodiment, the first electrode end battery cell (20-1), the second electrode end battery cell (20-2), and the series-parallel battery cell (20-3) may be arranged side by side in one direction (e.g., the Y-axis direction). The series-parallel battery cell (20-3) may be arranged between the first electrode end battery cell (20-1) and the second electrode end battery cell (20-2).

[0086] A plurality of first electrode end battery cells (20-1) connected in parallel by a first electrode parallel bus bar (41) can be arranged in a zigzag shape. According to one embodiment, a plurality of first electrode end battery cells (20-1) can be arranged in a 'V' shape.

[0087] A plurality of second electrode end battery cells (20-2) connected in parallel by a second electrode parallel bus bar (42) can be arranged in a zigzag shape. According to one embodiment, a plurality of second electrode end battery cells (20-2) can be arranged in a 'V' shape.

[0088] A plurality of series-parallel battery cells (20-3) connected in series by a series-parallel bus bar (43) can be arranged in a zigzag shape. According to one embodiment, a plurality of series-parallel battery cells (20-3) can be arranged in a 'V' shape.

[0089] The description of the battery cell (20) will be described later along with the description of FIGS. 4 to 6.

[0090] The holder portion (30) can be accommodated in the housing (10). According to one embodiment, the holder portion (30) can be accommodated in the housing body (11). A battery cell (20), a busbar assembly (40), and a circuit board (50) can be placed in the holder portion (30).

[0091] According to one embodiment, a plurality of battery cells (20) may be disposed inside the holder portion (30), and a busbar assembly (40) and a circuit board (50) may be disposed on the upper side (e.g., in the +Z axis direction) of the holder portion (30).

[0092] The holder portion (30) may include a lower holder (31) and an upper holder (32).

[0093] The lower holder (31) may be positioned lower than the upper holder (32) (e.g., in the -Z-axis direction). A battery cell (20) may be positioned in the lower holder (31).

[0094] The lower holder (31) may include a lower holder body (310) and a lower holder groove (311).

[0095] The lower holder body (310) may be provided in a roughly cuboid shape. The shape of the lower holder body (310) is not limited to a cuboid and may be provided in various shapes.

[0096] The lower holder groove (311) may be provided as a concave groove extending from the upper side (e.g., +Z-axis direction) to the lower side (e.g., -Z-axis direction) of the lower holder body (310). The lower holder groove (311) may be provided in multiple numbers. According to one embodiment, a battery cell (20) may be inserted into each of the lower holder grooves (311).

[0097] The upper holder (32) can be positioned above the lower holder (31) (e.g., in the +Z-axis direction).

[0098] The upper holder (32) may include an upper holder body (320), an upper holder seating groove (321), and an upper holder terminal hole (322).

[0099] The upper holder body (320) may be provided in a roughly cuboid shape. The shape of the upper holder body (320) is not limited to a cuboid and may be provided in various shapes.

[0100] The upper holder mounting groove (321) may be provided on the upper side (e.g., +Z-axis direction) of the upper holder body (320). The upper holder mounting groove (321) may be provided as a groove formed concavely from the upper side (e.g., +Z-axis direction) to the lower side (e.g., -Z-axis direction) of the upper holder body (320). A busbar assembly (40) may be placed in the upper holder mounting groove (321).

[0101] The shape of the upper holder mounting groove (321) may vary. The shape of the upper holder mounting groove (321) may correspond to the shape of the busbar assembly (40). According to one embodiment, the shape of the upper holder mounting groove (321) may correspond to the shape of the first electrode parallel busbar (41), the second electrode parallel busbar (42), and / or the series-parallel busbar (43).

[0102] The upper holder terminal hole (322) may be provided as a hole penetrating the upper holder body (320). A battery cell (20) may be placed in the upper holder terminal hole (322). According to one embodiment, the battery cell (20) inserted into the upper holder terminal hole (322) may be exposed to the upper side (e.g., +Z-axis direction) of the upper holder body (320). The battery cell (20) exposed to the upper side of the upper holder body (320) may be electrically connected to a busbar assembly (40) placed on the upper side (e.g., +Z-axis direction) of the upper holder body (320).

[0103] In this way, a lower holder (31) may be placed at the lower part (e.g., in the -Z-axis direction) of the battery cell (20), and an upper holder (32) may be placed at the upper part (e.g., in the +Z-axis direction) of the battery cell (20), and accordingly, a plurality of battery cells (20) may be fixed to the holder part (30).

[0104] The busbar assembly (40) may be positioned on the upper side (e.g., in the +Z-axis direction) of the holder portion (30). According to one embodiment, the busbar assembly (40) may be positioned in the upper holder seating groove (321) of the upper holder (32).

[0105] The busbar assembly (40) can electrically connect the battery cells (20). The busbar assembly (40) can connect the battery cells (20) in series, in parallel, or in series and parallel.

[0106] The busbar assembly (40) may include a first electrode parallel busbar (41), a second electrode parallel busbar (42), and a series-parallel busbar (43).

[0107] The first electrode parallel bus bar (41) can connect the first electrodes (e.g., positive electrodes) of a plurality of battery cells (20) in parallel. According to one embodiment, the first electrode parallel bus bar (41) can connect the first electrodes of two or more battery cells (20) in parallel. More specifically, the first electrode parallel bus bar (41) can connect the first electrodes of three battery cells (20) in parallel.

[0108] The first electrode parallel busbar (41) can be connected to a circuit board (50). As the first electrode parallel busbar (41) and the circuit board (50) are connected, information regarding the current, voltage, temperature, etc. of the first electrode parallel busbar (41) can be transmitted to the circuit board (50).

[0109] The second electrode parallel busbar (42) can connect the second electrodes (e.g., negative electrodes) of a plurality of battery cells (20) in parallel. According to one embodiment, the second electrode parallel busbar (42) can connect the second electrodes of two or more battery cells (20) in parallel. More specifically, the second electrode parallel busbar (42) can connect the second electrodes of three battery cells (20) in parallel.

[0110] The second electrode parallel busbar (42) can be connected to the circuit board (50). As the second electrode parallel busbar (42) and the circuit board (50) are connected, information regarding the current, voltage, temperature, etc. of the second electrode parallel busbar (42) can be transmitted to the circuit board (50).

[0111] The series-parallel busbar (43) can connect the first electrode of the first battery cell and the second electrode of the second battery cell among the plurality of battery cells (20) in series. According to one embodiment, the series-parallel busbar (43) can connect the first electrode (e.g., positive electrode) of the plurality of battery cells (20) connected to the first electrode parallel busbar (41) and the second electrode (e.g., negative electrode) of the plurality of battery cells (20) connected to the second electrode parallel busbar (42) to connect the battery cells (20) in series and parallel.

[0112] The series-parallel busbar (43) can be connected to the circuit board (50). As the series-parallel busbar (43) and the circuit board (50) are connected, information regarding the current, voltage, temperature, etc. of the series-parallel busbar (43) can be transmitted to the circuit board (50).

[0113] The busbar assembly (40) may include a first busbar assembly (40-1) and a second busbar assembly (40-2). Each of the first busbar assembly (40-1) and the second busbar assembly (40-2) may include a first electrode parallel busbar (41), a second electrode parallel busbar (42), and a series-parallel busbar (43).

[0114] The first group battery cells (21) can be connected to the circuit board (50) in series, parallel, and / or series-parallel by the first busbar assembly (40-1).

[0115] The second group battery cells (22) can be connected to the circuit board (50) in series, parallel, and / or series-parallel by the second busbar assembly (40-2).

[0116] The circuit board (50) can be connected to the battery cell (20) through the busbar assembly (40). According to one embodiment, the circuit board (50) can be connected to the battery cell (20) through the first electrode parallel busbar (41), the second electrode parallel busbar (42), and / or the series-parallel busbar (43). The circuit board (50) can measure the voltage, current, and temperature of the battery cell (20) connected to the first electrode parallel busbar (41), the second electrode parallel busbar (42), and / or the series-parallel busbar (43).

[0117] The circuit board (50) may include a circuit board body (500) and a circuit board connection part (501).

[0118] The circuit board body (500) may be provided in the shape of a roughly cuboid. The shape of the circuit board body (500) is not limited to a cuboid and may be provided in various shapes.

[0119] A circuit board connection part (501) connected to a busbar assembly (40) may be disposed on the circuit board body (500). According to one embodiment, the circuit board body (500) may be connected to a first electrode parallel busbar (41), a second electrode parallel busbar (42) and / or a series-parallel busbar (43) through the circuit board connection part (501) to receive information such as the voltage, current, and temperature of the battery cell (20).

[0120] The circuit board body (500) can connect the first group battery cell (21) and the second group battery cell (22). According to one embodiment, the circuit board body (500) can connect the first group battery cell (21) and the second group battery cell (22) in series, parallel, and / or series-parallel. Accordingly, the voltage, current capacity, etc. of the battery pack (1) can be adjusted. The circuit board body (500) can be placed between the first group battery cell (21) and the second group battery cell (22).

[0121]

[0122] FIG. 4 is a perspective view of a battery cell according to one embodiment of the present invention, FIG. 5 is a cross-sectional view schematically showing the configuration of a battery cell according to one embodiment of the present invention, and FIG. 6 is a cross-sectional view schematically showing the configuration of a battery cell according to one embodiment of the present invention.

[0123] Referring to FIGS. 4 to 6, the battery cell (20) according to the present embodiment includes an electrode assembly (210), a case (220), and a terminal (230).

[0124] In the following description, the battery cell (20) is described as a cylindrical battery as a lithium-ion secondary battery. However, the present invention is not limited thereto, and the battery cell (20) may be a lithium polymer battery or a prismatic battery.

[0125] The electrode assembly (210) can function as a unit structure that performs charging and discharging operations of power in a battery cell.

[0126] 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).

[0127] The electrode assembly (210) may have a shape wound around a winding axis.

[0128] 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).

[0129] 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 (20).

[0130] 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).

[0131] As the first electrode (211) functions as a positive electrode, the first active material layer may include a positive electrode active material.

[0132] 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.

[0133] 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, LNCM). 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, LNCM) 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, LNCM)중 어느 두개 또는 이들을 모두 포함하는 것도 가능하다.

[0134] The first active material layer may further include a positive conductive material.

[0135] 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.

[0136] The first active material layer may further include an anode binder.

[0137] 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).

[0138] Examples of positive binders may include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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).

[0147] As the second electrode (212) functions as a negative electrode, the second active material layer may include a negative active material.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] The above Si-based or Sn-based negative electrode active material can be used in combination with a carbon-based negative electrode active material.

[0155] The second active material layer may further include a cathode conductive material and a cathode binder.

[0156] 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.

[0157] 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).

[0158] Examples of cathode binders may include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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).

[0165] 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.

[0166] 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.

[0167] 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.

[0168] The above organic material may include a polyvinylidene fluoride-based polymer or a (meth)acrylic-based polymer.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] The case (220) may include a can (221) and a cap plate (224).

[0174] 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).

[0175] 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).

[0176] The can (221) may include a terminal plate (222) and an opening (223).

[0177] 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). The terminal plate (222) may contain iron (Fe).

[0178] 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 housing 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).

[0179] 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.

[0180] 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).

[0181] 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).

[0182] 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.

[0183] The cap plate (224) can be configured to seal the opening (223) of the can (221).

[0184] 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.

[0185] A groove may be formed in the cap plate (224), and if an event (e.g., fire) occurs in the battery cell (20) through the groove formed in the cap plate (224), the cap plate (224) may be broken. Therefore, as the groove is formed in the cap plate (224), the cap plate (224) can perform the function of a vent.

[0186] The case (220) according to the present embodiment may further include a beading portion (225) and a crimping portion (226).

[0187] 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.

[0188] 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).

[0189] 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).

[0190] 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).

[0191] 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).

[0192] 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).

[0193] 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.

[0194] 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).

[0195] 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).

[0196] 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.

[0197] 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).

[0198] 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.

[0199] The terminal (230) can be electrically connected to the first electrode (211) of the electrode assembly (210). As the terminal (230) is electrically connected to the first electrode (211), it can function as a first electrode terminal. 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).

[0200] For example, the terminal (230) can be connected to the first electrode (211) of the electrode assembly (210) by the first current collector (231).

[0201] 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).

[0202] 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.

[0203] 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).

[0204] The can (221) can be electrically connected to the second electrode (212) of the electrode assembly (210). According to one embodiment, the terminal plate (222) connected to the can (221) can function as the second electrode terminal. In this embodiment, as the first electrode (211) of the electrode assembly (210) is exemplified as the positive electrode, the terminal plate (222) provided on the can (221) can function as the negative electrode terminal of the battery cell (20).

[0205] For example, the can (221) can be connected to the second electrode (212) of the electrode assembly (210) by the second current collector (232).

[0206] 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.

[0207] 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).

[0208] 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).

[0209] 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.

[0210] 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).

[0211] 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).

[0212] The central axis of the terminal plate (222) can be located coaxially with the central axis (C) of the battery cell (20).

[0213] The busbar assembly (40) may be positioned inside the housing (10) facing the terminal plate (222) and / or terminal (230).

[0214] The busbar assembly (40) can be electrically connected to the terminal plate (222) and / or terminal (230). The busbar assembly (40) 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.

[0215] The busbar assembly (40) may be provided in multiple numbers. Each busbar assembly (40) may be individually connected to the terminal plate (222) and / or terminal (230) of a different battery cell (20).

[0216] The busbar assembly (40) 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 (40) may be formed to have a straight shape, and it may also have a bent structure having one or more bending sections.

[0217] The busbar assembly (40) 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.

[0218] The busbar assembly (40) 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.

[0219] The busbar assembly (40) can connect multiple battery cells (20) in parallel, in series, or in series and parallel.

[0220]

[0221] FIG. 7 is a perspective view of a holder part, a busbar assembly, and a circuit board according to an embodiment of the present invention; FIG. 8 is an exploded perspective view of a holder part, a busbar assembly, and a circuit board according to an embodiment of the present invention; FIG. 9 is a perspective view of a circuit board and a busbar assembly according to an embodiment of the present invention; FIG. 10 is a cross-sectional perspective view of a part of a holder part and a battery cell according to an embodiment of the present invention; FIG. 11 is a cross-sectional perspective view of a part of a holder part and a busbar assembly according to an embodiment of the present invention; FIG. 12 is a plan view of a first electrode parallel busbar according to an embodiment of the present invention; FIG. 13 is a plan view of a second electrode parallel busbar according to an embodiment of the present invention; and FIG. 14 is a plan view of a series-parallel busbar according to an embodiment of the present invention.

[0222] Referring to FIGS. 7 to 14, the holder part (30), the busbar assembly (40), and the circuit board (50) will be described.

[0223] The holder portion (30) may include a lower holder (31) and an upper holder (32).

[0224] The upper holder (32) may include an upper holder body (320), an upper holder seating groove (321), and an upper holder terminal hole (322).

[0225] The shape of the upper holder body (320) may be approximately a cuboid. The upper holder body (320) may include an insulating material that does not conduct electricity. According to one embodiment, it may include a synthetic resin such as plastic.

[0226] The upper holder mounting groove (321) may be provided as a groove formed concavely in the upper holder body (320). A busbar assembly (40) may be disposed in the upper holder mounting groove (321). According to one embodiment, a first electrode parallel busbar (41), a second electrode parallel busbar (42), and / or a series-parallel busbar (43) may be inserted into the upper holder mounting groove (321).

[0227] The shape of the upper holder mounting groove (321) may vary. The shape of the upper holder mounting groove (321) may be provided to correspond to the shape of the first electrode parallel bus bar (41), the second electrode parallel bus bar (42), and / or the series-parallel bus bar (43).

[0228] An upper holder mounting projection (3211) formed to protrude from the upper holder body (320) may be disposed in the upper holder mounting groove (321). The upper holder mounting projection (3211) may be inserted into a bending recess (414) formed in the busbar body (400).

[0229] As the upper holder seating projection (3211) is inserted into the bending concave portion (414), the busbar body (400) can be fixed to the upper holder (32).

[0230] The upper holder (32) may include an upper holder terminal hole (322) provided as a hole penetrating the upper holder body (320). Through the upper holder terminal hole (322), the terminal plate (222) and / or terminal (230) of the battery cell (20) may be exposed to the upper side (e.g., +Z-axis direction) of the upper holder body (320). The terminal (230) of the battery cell (20) may function as a first electrode terminal (e.g., positive terminal), and the terminal plate (222) may function as a second electrode terminal (e.g., negative terminal).

[0231] A busbar body (400) placed in an upper holder mounting groove (321) is connected to a terminal plate (222) and / or a terminal (230) exposed through an upper holder terminal hole (322) so that a plurality of battery cells (20) can be connected in series, parallel and / or series-parallel.

[0232] The upper holder terminal hole (322) may include a first electrode terminal hole (3221) and a second electrode terminal hole (3222).

[0233] A terminal (230) can be exposed to the upper side (e.g., +Z-axis direction) of the upper holder body (320) through the first electrode terminal hole (3221), and a terminal plate (222) can be exposed to the upper side (e.g., +Z-axis direction) of the upper holder body (320) through the second electrode terminal hole (3222).

[0234] The cross-sectional shape of the first electrode terminal hole (3221) may be approximately circular. The cross-sectional shape of the first electrode terminal hole (3221) is not limited to a circular shape and may be provided in various shapes.

[0235] The terminal (230) of the battery cell (20) can be inserted by moving from the lower (e.g., -Z-axis direction) to the upper (e.g., +Z-axis direction) of the first electrode terminal hole (3221), and the terminal (230) can come into contact with the first electrode terminal contact part (401) of the busbar assembly (40).

[0236] An upper holder terminal lumber (3221-1) and an upper holder terminal opening (3221-2) may be disposed in the first electrode terminal hole (3221).

[0237] The upper holder terminal rib (3221-1) may protrude in one direction (e.g., +Z-axis direction) from the upper holder body (320) in the first electrode terminal hole (3221). As the upper holder terminal rib (3221-1) is positioned in the first electrode terminal hole (3221), it is possible to prevent foreign matter from coming into contact with the terminal (230) and the busbar body (400).

[0238] The upper holder terminal opening (3221-2) can be defined as the part where the upper holder terminal slot (3221-1) is open. As the upper holder terminal opening (3221-2) is formed, the busbar body (400) can come into contact with the terminal (230) through the upper holder terminal opening (3221-2).

[0239] The cross-sectional shape of the second electrode terminal hole (3222) may be approximately rectangular. The cross-sectional shape of the second electrode terminal hole (3222) is not limited to a rectangular shape and may be provided in various shapes.

[0240] The terminal plate (222) of the battery cell (20) moves from the lower part (e.g., -Z-axis direction) to the upper part (e.g., +Z-axis direction) of the second electrode terminal hole (3222), so that the terminal plate (222) can come into contact with the second electrode terminal contact part (402) of the busbar assembly (40).

[0241] The busbar assembly (40) may include a first busbar assembly (40-1) and a second busbar assembly (40-2).

[0242] Each of the first busbar assembly (40-1) and the second busbar assembly (40-2) can connect battery cells (20) in series, parallel, and / or series-parallel. The first busbar assembly (40-1) and the second busbar assembly (40-2) can be connected by a circuit board (50). According to one embodiment, the first busbar assembly (40-1) and the second busbar assembly (40-2) can be connected in series and / or parallel.

[0243] The first busbar assembly (40-1) and the second busbar assembly (40-2) may each include a first electrode parallel busbar (41), a second electrode parallel busbar (42), and / or a series-parallel busbar (43).

[0244] The first electrode parallel bus bar (41) can connect the first electrodes (e.g., positive electrodes, terminals (230)) of a plurality of battery cells (20) in parallel. According to one embodiment, the first electrode parallel bus bar (41) can connect the terminals (230) of the first electrode end battery cells (20-1) in parallel. More specifically, the first electrode parallel bus bar (41) can connect the terminals (230) of three first electrode end battery cells (20-1) in parallel.

[0245] The second electrode parallel bus bar (42) can connect the second electrodes (e.g., negative electrodes, terminal plates (222)) of a plurality of battery cells (20) in parallel. According to one embodiment, the second electrode parallel bus bar (42) can connect the terminal plates (222) of the second electrode end battery cells (20-2) in parallel. More specifically, the second electrode parallel bus bar (42) can connect the terminal plates (222) of three second electrode end battery cells (20-2) in parallel.

[0246] The series-parallel busbar (43) can connect the first electrode and the second electrode of a plurality of battery cells (20) in series, parallel, or series-parallel.

[0247] The series-parallel busbar (43) can connect the second electrode of the first electrode end battery cell (20-1) in parallel, or connect the first electrode of the second electrode end battery cell (20-2) in parallel.

[0248] The series-parallel busbar (43) can connect the second electrode of the first electrode end battery cell (20-1) and the first electrode of the series-parallel battery cell (20-3) in series, or connect the first electrode of the second electrode end battery cell (20-2) and the second electrode of the series-parallel battery cell (20-3) in series.

[0249] The series-parallel busbar (43) can connect the first electrode of the series-parallel battery cell (20-3) and the second electrode of another series-parallel battery cell (20-3) in series.

[0250] Accordingly, the series-parallel busbar (43) can connect multiple battery cells (20) in series and parallel.

[0251] The shapes of the first electrode parallel busbar (41), the second electrode parallel busbar (42), and the series-parallel busbar (43) may vary. The shapes of the first electrode parallel busbar (41), the second electrode parallel busbar (42), and the series-parallel busbar (43) may be provided as 'T', 'C', 'E', 'I', 'H', etc.

[0252] According to one embodiment, the shape of the first electrode parallel bus bar (41) may be provided in a 'C' shape, the shape of the second electrode parallel bus bar (42) may be provided in a 'T' shape, and the shape of the series-parallel bus bar (43) may be provided in an 'E' shape.

[0253] The shapes of the first electrode parallel busbar (41), the second electrode parallel busbar (42), and the series-parallel busbar (43) are not limited to the above examples and can vary.

[0254] The first electrode parallel bus bar (41) may include a bus bar body (400), a first electrode terminal contact part (401), a substrate contact part (403), and a bending part (410).

[0255] The shape of the busbar body (400) can be provided as 'T', 'C', 'E', 'I', 'H', etc. The busbar body (400) may include a conductive material such as metal. According to one embodiment, the busbar body (400) may include copper.

[0256] A first electrode terminal contact portion (401) may be disposed at the end of the busbar body (400). The first electrode terminal contact portion (401) may be energized by contacting the terminal (230) of the battery cell (20). The first electrode terminal contact portion (401) may include metal. According to one embodiment, the first electrode terminal contact portion (401) may include aluminum.

[0257] A bending portion (410) may be disposed between a plurality of first electrode terminal contact portions (401). According to one embodiment, the bending portion (410) may be disposed at a portion where the busbar body (400) is bent. Accordingly, even if the distance between terminals (230) changes due to a change in the volume of the battery cell (20) caused by swelling, the bending portion (410) can be deformed to compensate for the change in distance between terminals (230).

[0258] A substrate contact portion (403) may be disposed on the busbar body (400). The substrate contact portion (403) may be connected to a circuit board (50). As the busbar body (400) and the circuit board (50) come into contact through the substrate contact portion (403), information regarding the voltage, current, and temperature of the battery cell (20) connected to the busbar body (400) may be transmitted to the circuit board (50).

[0259] A bending portion (410) may be disposed between the first electrode terminal contact portion (401) and the substrate contact portion (403). The height of one side (411) of the bending portion and the height of the other side (412) of the bending portion (410) disposed between the first electrode terminal contact portion (401) and the substrate contact portion (403) may be disposed differently.

[0260] The second electrode parallel bus bar (42) may include a bus bar body (400), a second electrode terminal contact part (402), a substrate contact part (403), and a bending part (410).

[0261] The shape of the busbar body (400) can be provided as 'T', 'C', 'E', 'I', 'H', etc. The busbar body (400) may include a conductive material such as metal. According to one embodiment, the busbar body (400) may include copper.

[0262] A second electrode terminal contact portion (402) may be disposed on a part of the busbar body (400). The second electrode terminal contact portion (402) may include metal. According to one embodiment, the second electrode terminal contact portion (402) may include copper.

[0263] A bending portion (410) may be disposed between a plurality of second electrode terminal contact portions (402). Accordingly, even if the distance between terminal plates (222) changes due to a change in the volume of the battery cell (20) caused by swelling, the bending portion (410) can be deformed to compensate for the change in distance between terminal plates (222).

[0264] A substrate contact portion (403) may be disposed on the busbar body (400). The substrate contact portion (403) may be connected to a circuit board (50). As the busbar body (400) and the circuit board (50) come into contact through the substrate contact portion (403), information regarding the voltage, current, and temperature of the battery cell (20) connected to the busbar body (400) may be transmitted to the circuit board (50).

[0265] A bending portion (410) may be disposed between the second electrode terminal contact portion (402) and the substrate contact portion (403). The height of one side (411) of the bending portion and the height of the other side (412) of the bending portion (410) disposed between the second electrode terminal contact portion (402) and the substrate contact portion (403) may be disposed differently.

[0266] The series-parallel busbar (43) may include a busbar body (400), a first electrode terminal contact part (401), a second electrode terminal contact part (402), a substrate contact part (403), and a bending part (410).

[0267] The shape of the busbar body (400) can be provided as 'T', 'C', 'E', 'I', 'H', etc. The busbar body (400) may include a conductive material such as metal. According to one embodiment, the busbar body (400) may include copper.

[0268] A first electrode terminal contact portion (401) may be disposed at the end of the busbar body (400). The first electrode terminal contact portion (401) may be energized by contacting the terminal (230) of the battery cell (20). The first electrode terminal contact portion (401) may include metal. According to one embodiment, the first electrode terminal contact portion (401) may include aluminum.

[0269] A second electrode terminal contact portion (402) may be disposed on a part of the busbar body (400). The second electrode terminal contact portion (402) may include metal. According to one embodiment, the second electrode terminal contact portion (402) may include copper.

[0270] A bending portion (410) may be disposed between a plurality of first electrode terminal contact portions (401). According to one embodiment, the bending portion (410) may be disposed at a portion where the busbar body (400) is bent. Accordingly, even if the distance between terminals (230) changes due to a change in the volume of the battery cell (20) caused by swelling, the bending portion (410) can be deformed to compensate for the change in distance between terminals (230).

[0271] A bending portion (410) may be disposed between a plurality of second electrode terminal contact portions (402). Accordingly, even if the distance between terminal plates (222) changes due to a change in the volume of the battery cell (20) caused by swelling, the bending portion (410) can be deformed to compensate for the change in distance between terminal plates (222).

[0272] A bending portion (410) may be disposed between the first electrode terminal contact portion (401) and the second electrode terminal contact portion (402). Accordingly, even if the distance between the terminal (230) of one battery cell (20) and the terminal plate (222) of another battery cell (20) changes due to swelling, the bending portion (410) can be deformed to compensate for the change in distance between the terminal plate (222) and the terminal (230).

[0273] A substrate contact portion (403) may be disposed on the busbar body (400). The substrate contact portion (403) may be connected to a circuit board (50). As the busbar body (400) and the circuit board (50) come into contact through the substrate contact portion (403), information regarding the voltage, current, and temperature of the battery cell (20) connected to the busbar body (400) may be transmitted to the circuit board (50).

[0274] A bending portion (410) may be disposed between the first electrode terminal contact portion (401) and / or the second electrode terminal contact portion (402) and the substrate contact portion (403). The height of one side (411) of the bending portion and the height of the other side (412) of the bending portion (410) disposed between the first electrode terminal contact portion (401) and / or the second electrode terminal contact portion (402) and the substrate contact portion (403) may be disposed differently.

[0275] The busbar body (400) may include a bending portion (410) formed to be bent. As the bending portion (410) is formed in the busbar body (400), the length may change in response to the volume change due to swelling of the battery cell (20). The bending portion (410) may be provided in an approximate 'U' shape.

[0276] The bending portion (410) may include a bending portion one side (411) and a bending portion other side (412). According to one embodiment, the height of the bending portion one side (411) and the height of the bending portion other side (412) may be the same or different. The bending portion other side (412) may be positioned closer to the first electrode terminal contact portion (401) than the bending portion one side (411). According to one embodiment, the height of the bending portion other side (412) (e.g., Z-axis direction) may be positioned lower than the height of the bending portion one side (411) (e.g., Z-axis direction).

[0277] The bending portion (410) may include a bending bridge (413). The bending bridge (413) may be defined as a portion that protrudes upward from the bending portion (410) (e.g., in the +Z-axis direction). As the bending bridge (413) protrudes upward, a bending recess (414) may be formed on the lower side of the bending bridge (413) (e.g., in the -Z-axis direction).

[0278] The upper holder mounting projection (3211) of the upper holder (32) can be inserted into the bending concave portion (414). Accordingly, the busbar body (400) can be fixed to the upper holder (32). In addition, the position where the busbar body (400) is placed can be guided by the bending concave portion (414) and the upper holder mounting projection (3211).

[0279] The description of the bending slit (415) is explained with reference to FIGS. 15 to 20.

[0280] The circuit board (50) may include a circuit board body (500), a circuit board connection part (501), and a connection guide part (502).

[0281] The circuit board body (500) may be extended along one direction (e.g., the Y-axis direction). The shape of the circuit board body (500) may be approximately a cuboid. A circuit board connection part (501) connected to a busbar body (400) may be disposed on the circuit board body (500). According to one embodiment, the circuit board connection part (501) may be disposed on both sides (e.g., the X-axis direction) of the circuit board body (500). The circuit board connection part (501) may be connected to a substrate contact part (403) of the busbar body (400).

[0282] The circuit board connection portion (501) may include a conductive material. According to one embodiment, the circuit board connection portion (501) may include copper.

[0283] As the circuit board connection part (501) and the board contact part (403) come into contact and conduct electricity, the circuit board (50) can receive information (e.g., voltage, current, temperature, etc.) of the battery cell (20).

[0284] A connection guide portion (502) may be disposed on a circuit board body (500). The connection guide portion (502) may extend from the circuit board body (500) toward a circuit board connection portion (501). According to one embodiment, the connection guide portion (502) may extend parallel in one direction (e.g., Y-axis direction) from the circuit board body (500) toward the circuit board connection portion (501).

[0285] A substrate contact portion (403) may be disposed between the connection guide portion (502) and the circuit board connection portion (501). The substrate contact portion (403) may be pressed downward (e.g., in the -Z axis direction) by the connection guide portion (502). Accordingly, the substrate contact portion (403) and the circuit board connection portion (501) may be in close contact. The substrate contact portion (403) and the circuit board connection portion (501) may be joined by welding or the like.

[0286]

[0287] FIG. 15 is a perspective view of a first embodiment of a first electrode terminal contact part according to the present invention, FIG. 16 is a perspective view of a second embodiment of a first electrode terminal contact part according to the present invention, and FIG. 17 is a perspective view of a third embodiment of a first electrode terminal contact part according to the present invention.

[0288] Referring to FIGS. 15 to 17, various embodiments of the first electrode terminal contact portion (401) can be seen.

[0289] The first electrode terminal contact portion (401) shown in FIG. 15 is a first embodiment of the first electrode terminal contact portion (401) disposed at the end of the first electrode parallel bus bar (41) shown in FIG. 12 and a first embodiment of the first electrode terminal contact portion (401) disposed at the end of the series parallel bus bar (43) shown in FIG. 14.

[0290] The first electrode terminal contact portion (401) shown in FIG. 16 is a second embodiment of the first electrode terminal contact portion (401) positioned in the center of the first electrode parallel bus bar (41) shown in FIG. 12.

[0291] The first electrode terminal contact part (401) shown in FIG. 17 is a third embodiment of the first electrode terminal contact part (401) positioned in the middle of the series-parallel bus bar (43) shown in FIG. 14.

[0292] The first electrode terminal contact portion (401) can connect the busbar body (400) and the terminal (230) of the battery cell (20). According to one embodiment, the first electrode terminal contact portion (401) can connect the busbar body (400) and the terminal (230) of the first electrode end battery cell (20-1).

[0293] The first electrode terminal contact portion (401) may include a metal different from that of the busbar body (400). According to one embodiment, the busbar body (400) may include copper, and the first electrode terminal contact portion (401) may include aluminum.

[0294] The thickness of the busbar body (400) may be approximately 0.1 mm to 0.5 mm. According to one embodiment, the thickness of the busbar body (400) may be approximately 0.3 mm.

[0295] The thickness of the first electrode terminal contact portion (401) may be approximately 0.2 mm to 0.6 mm. According to one embodiment, the thickness of the first electrode terminal contact portion (401) may be approximately 0.4 mm. As the thickness of the branching first electrode terminal contact portion (401) is made thicker than that of the busbar body (400), the bottleneck phenomenon in the first electrode terminal contact portion (401) can be reduced.

[0296] The first embodiment of the first electrode terminal contact part (401) shown in FIG. 15 can be connected to a single busbar body (400) without branching.

[0297] A second embodiment of the first electrode terminal contact part (401) shown in FIG. 16 can be branched and connected to two busbar bodies (400).

[0298] A third embodiment of the first electrode terminal contact part (401) shown in FIG. 17 can be branched and connected to three busbar bodies (400).

[0299] Referring to FIGS. 15 to 17, the bending portion (410) may be connected to the first electrode terminal contact portion (401). According to one embodiment, the bending portion (410) may be formed integrally with the first electrode terminal contact portion (401).

[0300] The other side (412) of the bending part (410) can be positioned closer to the terminal (230) than the one side (411) of the bending part.

[0301] The bending portion (410) may include a bending bridge (413), and the bending bridge (413) may be bent to protrude to one side (e.g., in the +Z-axis direction). As the bending bridge (413) is bent to protrude to one side, a bending recess (414) may be formed in the opposite direction to the direction in which the bending bridge (413) protrudes. An upper holder seating projection (3211) may be inserted into the bending recess (414).

[0302] A bending slit (415) formed in a hole may be disposed in the bending bridge (413). The bending slit (415) may be provided as a hole extending from one side (411) of the bending part to the other side (412) of the bending part.

[0303] As the bending slit (415) is formed in the bending bridge (413), the capacity of current that can flow through the bending bridge (413) can be reduced, and the bending bridge (413) with the formed bending slit (415) can perform the function of a fuse. Accordingly, the safety of the battery cell (20) and the battery pack (1) can be improved.

[0304] The length of the bending bridge (413) can be approximately 2.0 mm to 10.0 mm.

[0305] One or more bending slits (415) formed in the bending bridge (413) may be provided.

[0306] The width of the bending slit (415) can be approximately 0.5 mm to 1.5 mm. According to one embodiment, the width of the bending slit (415) can be approximately 0.8 mm.

[0307] The spacing between adjacent bending slits (415) can be approximately 0.8 mm to 5.0 mm. According to one embodiment, the spacing between adjacent bending slits (415) can be approximately 1.0 mm or more.

[0308]

[0309] FIG. 18 is a perspective view of a first embodiment of a bending part of a busbar assembly according to the present invention, FIG. 19 is a perspective view of a second embodiment of a bending part of a busbar assembly according to the present invention, and FIG. 20 is a perspective view of a third embodiment of a bending part of a busbar assembly according to the present invention.

[0310] Referring to FIGS. 18 to 20, various embodiments of the bending part (410) can be observed. The height of one side (411) of the bending part and the height of the other side (412) of the bending part (410) shown in FIGS. 18 to 20 may be provided differently. According to one embodiment, the height of one side (411) of the bending part may be formed higher than the height of the other side (412) of the bending part.

[0311] Referring to FIGS. 18 to 20, a plurality of bending slits (415) may be provided in the bending portion (410).

[0312] Referring to FIG. 18, a portion of the bending portion (410) protruding toward the first electrode terminal contact portion (401), the second electrode terminal contact portion (402), and / or the substrate contact portion (403) may be positioned perpendicular to the longitudinal direction of the busbar body (400).

[0313] Referring to FIG. 19, a portion of the bending portion (410) protruding toward the first electrode terminal contact portion (401), the second electrode terminal contact portion (402), and / or the substrate contact portion (403) may be arranged in a 'V' shape along the longitudinal direction of the busbar body (400).

[0314] Referring to FIG. 20, a portion of the bending portion (410) protruding toward the first electrode terminal contact portion (401), the second electrode terminal contact portion (402), and / or the substrate contact portion (403) may be arranged in a curved shape with respect to the longitudinal direction of the busbar body (400).

[0315] Even if the spacing between the battery cells (20) changes as described above, the bending part (410) can compensate for the change in spacing between the battery cells (20).

[0316] In addition, even if the heights of the terminal plate (222), terminal (230) and / or circuit board connection part (501) are different, the height of one side (411) of the bending part (410) and the height of the other side (412) of the bending part are formed differently, so that the flatness of the welding surface can be improved.

[0317] The height difference between the electrode terminals of the battery cell (20) can be compensated through the busbar assembly (40) according to the present invention and the battery pack (1) including the same.

[0318] In addition, the flatness of the welding surface (e.g., terminal (230), terminal plate (222)) of the battery cell (20) can be improved through the busbar assembly (40) according to the present invention and the battery pack (1) including the same.

[0319] 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.

[0320] Therefore, the technical scope of protection of the present invention should be determined by the following patent claims.

Claims

1. A first electrode parallel busbar connecting the first electrode terminals in parallel to two or more first electrode end battery cells among a plurality of battery cells having a first electrode terminal and a second electrode terminal; A second electrode parallel busbar connecting the second electrode terminals provided in parallel on two or more second electrode end battery cells among the plurality of battery cells; and A busbar assembly characterized by comprising: a second electrode terminal provided in two or more battery cells in which the first electrode terminal is connected in parallel among the plurality of battery cells; and one or more series-parallel busbars connecting the first electrode terminal provided in two or more battery cells in which the second electrode terminal is connected in parallel among the plurality of battery cells.

2. In Paragraph 1, A busbar assembly characterized in that the above series-parallel busbar is connected to the second electrode terminal provided in the first electrode end battery cell.

3. In Paragraph 1, A busbar assembly characterized in that the above series-parallel busbar is connected to the first electrode terminal provided in the second electrode end battery cell.

4. In Paragraph 1, The above series-parallel busbar includes a first series-parallel busbar and a second series-parallel busbar, and A busbar assembly characterized in that the first series-parallel busbar connects the first electrode terminal of the battery cell, which is connected in parallel by the second series-parallel busbar.

5. In Paragraph 1, A busbar assembly characterized in that the first electrode parallel busbar, the second electrode parallel busbar, and the series-parallel busbar each include a substrate contact portion connected to a circuit board.

6. In Paragraph 1, The first electrode parallel busbar and the series parallel busbar each contact the first electrode terminal and include a first electrode terminal contact portion comprising a first metal. A busbar assembly characterized by the above-mentioned second electrode parallel busbar, and the above-mentioned series-parallel busbar contacting the second electrode terminal and including a second electrode terminal contact portion comprising a second metal different from the first metal.

7. In Paragraph 1, At least one of the first electrode parallel busbar, the second electrode parallel busbar, and the series-parallel busbar is, Busbar body; and A busbar assembly characterized by including a bending portion disposed on the busbar body and formed such that the space between one side of the bending portion and the other side of the bending portion is bent.

8. In Paragraph 7, A busbar assembly characterized in that the height of one side of the bending part and the height of the other side of the bending part are different from each other.

9. In Paragraph 7, The above bending part is, A bending bridge disposed on the busbar body and formed concavely; and A busbar assembly characterized by further including a bending slit formed as a hole penetrating the bending bridge in the above-mentioned bending portion.

10. In Paragraph 9, The first electrode parallel busbar above connects three first electrode end battery cells in parallel, and The above second electrode parallel busbar connects three second electrode end battery cells in parallel, and A busbar assembly characterized by the above series-parallel busbar connecting three of the above battery cells in parallel.

11. A holder part including a lower holder and an upper holder; A first group battery cell having a plurality of battery cells disposed between the lower holder and the upper holder and comprising a first electrode terminal and a second electrode terminal; and A first busbar assembly disposed in the upper holder and electrically connecting the battery cells of the first group of battery cells; comprising The above-mentioned first busbar assembly is, A first electrode parallel bus bar connecting the first electrode terminals provided in two or more first electrode end battery cells among the plurality of battery cells in parallel; A second electrode parallel busbar connecting the second electrode terminals provided in parallel on two or more second electrode end battery cells among the plurality of battery cells; and A battery pack characterized by comprising: a second electrode terminal provided in two or more battery cells in which the first electrode terminal is connected in parallel among the plurality of battery cells; and one or more series-parallel busbars connecting the first electrode terminal provided in two or more battery cells in which the second electrode terminal is connected in parallel among the plurality of battery cells.

12. In Paragraph 11, A second group battery cell having a plurality of battery cells disposed between the lower holder and the upper holder and comprising a first electrode terminal and a second electrode terminal; and A battery pack characterized by comprising: a second busbar assembly disposed in the upper holder above and electrically connecting the battery cells of the second group of battery cells, and having a first electrode parallel busbar, a second electrode parallel busbar and a series-parallel busbar.

13. In Paragraph 12, A battery pack further comprising: a circuit board connection portion disposed in the upper holder and connected to the first busbar assembly and the second busbar assembly, and a circuit board connecting the first busbar assembly and the second busbar assembly in series.

14. In Paragraph 12 The above upper holder is, Upper holder body; and A battery pack characterized by including an upper holder seating groove formed as a concave groove in the upper holder body, wherein the first busbar assembly and the second busbar assembly are disposed therein.

15. In Paragraph 14, A battery pack characterized in that the upper holder further includes an upper holder mounting projection that is disposed in the upper holder mounting groove and protrudes from the upper holder body and is inserted into a bending recess formed concavely in the first busbar assembly or the second busbar assembly.

16. In Paragraph 12, The above upper holder is, Upper holder body; and A battery pack characterized by including an upper holder terminal hole that penetrates the upper holder body and exposes the battery cell.

17. In Paragraph 11, At least one of the first electrode parallel busbar, the second electrode parallel busbar, and the series-parallel busbar is, Busbar body; and A battery pack characterized by including a bending portion disposed on the busbar body and formed such that the space between one side of the bending portion and the other side of the bending portion is bent.

18. In Paragraph 17, A battery pack characterized by the fact that the height of one side of the bending part and the height of the other side of the bending part are different from each other.

19. In Paragraph 17, The above bending part is, A bending bridge disposed on the busbar body and formed concavely; and A battery pack characterized by further including a bending slit formed as a hole penetrating the bending bridge.

20. In Paragraph 19, The first electrode parallel busbar above connects three first electrode end battery cells in parallel, and The above second electrode parallel busbar connects three second electrode end battery cells in parallel, and A battery pack characterized by the above series-parallel busbar connecting three of the above battery cells in parallel.

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