Patent Publication Number: US-2021184198-A1

Title: Battery pack

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     Korean Patent Application No. 10-2019-0164645, filed on Dec. 11, 2019, in the Korean Intellectual Property Office, and entitled: “Battery Pack,” is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     Embodiments relate to a battery pack. 
     2. Description of the Related Art 
     Secondary batteries are rechargeable, unlike primary batteries. Secondary batteries may be used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, or the like, and depending on the types of external devices to which they are applied, the secondary batteries may be used in the form of a single battery or in the form of a battery module in which a plurality of batteries are connected and combined into one unit. 
     A small mobile device such as a mobile phone may operate for a certain time according to the output and capacity of a single battery; however, in the case of long-time driving or high-power driving such as in the case of an electric vehicle or a hybrid vehicle with high power consumption, a battery module including a plurality of batteries may be preferred due to output and capacity issues, and the battery module may increase the output voltage or the output current according to the number of built-in batteries. 
     SUMMARY 
     The embodiments may be realized by providing a battery pack including a base substrate including first and second surfaces opposite to each other, an output terminal being on the first surface; and a battery cell on the second surface of the base substrate, the battery cell including an accommodation portion in which an electrode assembly is accommodated, and a terrace portion that seals the accommodation portion and which is bent toward the base substrate, an electrode tab connected to the electrode assembly being drawn out of the terrace portion and electrically connected to the output terminal. 
     A first main surface of the accommodation portion and the second surface of the base substrate may be arranged parallel to each other. 
     The accommodation portion may include a front surface at which the electrode tab is drawn, a rear surface opposite to the front surface, the first main surface and a second main surface connecting the front surface to the rear surface, the first main surface and the second main surface each having a largest area among surfaces of the accommodation portion, and a pair of side surfaces connecting the front surface to the rear surface, the pair of side surfaces each having an area smaller than the area of each of the first main surface and the second main surface. 
     The first main surface and the second main surface may each have a larger area than that of the front surface, the rear surface, and the side surfaces of the accommodation portion. 
     The first main surface may correspond to the main surface distal to the terrace portion along a direction in which the first main surface and the second main surface face each other. 
     The battery pack may further include an adhesive member between the first main surface of the accommodation portion and the second surface of the base substrate. 
     The adhesive member may include a double-sided tape. 
     The battery cell may include a sealing portion formed along an edge of the accommodation portion to seal the accommodation portion, and the sealing portion may include the terrace portion extending from the accommodation portion in a front direction of the accommodation portion and a side sealing portion extending from the accommodation portion in a side direction of the accommodation portion. 
     The terrace portion and the side sealing portion may be spaced apart from each other with a gap therebetween and are respectively folded up toward a front surface and a side surfaces of the accommodation portion. 
     The electrode tab may include first and second electrode tabs of different polarities. 
     The output terminal may include a first terminal group including a pair of first and second output terminals of different polarities; and a second terminal group including a pair of first and second output terminals of different polarities. 
     The first and second output terminals forming the first terminal group may be spaced apart from each other along a same direction in which the first and second electrode tabs of the battery cell are spaced apart, and the first and second output terminals forming the second terminal group may be spaced apart from each other along the same direction in which the first and second electrode tabs of the battery are spaced apart. 
     The first terminal group and the second terminal group may be spaced apart from each other along a direction intersecting with a direction in which the first and second electrode tabs are spaced apart. 
     The battery pack may further include a connection tab protruding from the second surface and electrically connected to the electrode tab on the second surface of the base substrate. 
     The electrode tab may include first and second electrode tabs of different polarities, the connection tab may include first and second connection tabs respectively connected to the first and second electrode tabs, and a first tab including the first electrode tab and the first connection tab connected to each other and a second tab including the second electrode tab and the second connection tab connected to each other may each be between a first main surface of the accommodation portion and the second surface of the base substrate. 
     The battery pack may further include a tab tape around a coupling portion of the first electrode tab and the first connection tab and around a coupling portion of the second electrode tab and the second connection tab. 
     The first and second tabs may be between the first main surface of the accommodation portion and the second surface of the base substrate, the first and second tabs being curved to surround the accommodation portion from the terrace portion bent toward the base substrate. 
     The battery pack may further include a tab hole penetrating the first and second surfaces of the base substrate in the base substrate, wherein the electrode tab extends onto the first surface of the base substrate through the tab hole from the terrace portion bent toward the base substrate on a side of the second surface of the base substrate. 
     The electrode tab may be bent to be in parallel to the first surface of the base substrate around the tab hole to overlap the first surface. 
     The electrode tab may overlap the output terminal on the first surface of the base substrate and is coupled with the output terminal. 
     The battery pack may further include a conductive tape attached onto the electrode tab overlapping the output terminal. 
     The output terminal may include a first terminal group including a pair of first and second output terminals of different polarities; and a second terminal group including a pair of first and second output terminals of different polarities, the first and second terminal groups may be spaced apart from each other in a lengthwise direction of the electrode tab extending on the first surface, and the electrode tab may be coupled with the first terminal group proximate to the tab hole in the lengthwise direction of the electrode tab, among the first and second terminal groups. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Features will be apparent to those of skill in the art by describing in detail exemplary embodiments with reference to the attached drawings in which: 
         FIG. 1  is a perspective view of a battery pack according to an embodiment; 
         FIGS. 2 and 3  are different exploded perspective views of the battery pack of  FIG. 1 ; 
         FIG. 4  is a side view of the battery pack of  FIG. 1 ; 
         FIGS. 5A and 5B  are perspective views of a battery cell of  FIG. 1 , which illustrate the shapes of an electrode tab before and after bending; 
         FIG. 6  is a cross-sectional view of the battery cell taken along line VI-VI′ of  FIG. 5A ; 
         FIG. 7  is a perspective view of a battery pack according to another embodiment; 
         FIG. 8  is an exploded perspective view of the battery pack of  FIG. 7 ; and 
         FIG. 9  is a side view of the battery pack of  FIG. 7 . 
     
    
    
     DETAILED DESCRIPTION 
     Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementations to those skilled in the art. 
     In the drawing figures, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as being “on” another layer or element, it can be directly on the other layer or element, or intervening layers may also be present. In addition, it will also be understood that when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. Like reference numerals refer to like elements throughout. 
     Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of the present description. As used herein, the terms “or” and “and/or” include any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. 
     Hereinafter, battery packs according to example embodiments will be described with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a battery pack according to an embodiment.  FIGS. 2 and 3  are different exploded perspective views of the battery pack of  FIG. 1 .  FIG. 4  is a side view of the battery pack of  FIG. 1 .  FIGS. 5A and 5B  are perspective views of a battery cell of  FIG. 1 , which illustrate the shapes of an electrode tab before and after bending.  FIG. 6  is a cross-sectional view of the battery cell taken along line VI-VI′ of  FIG. 5A . 
     Referring to  FIGS. 1 to 4 , the battery pack may include a base substrate  50  including first and second surfaces  51  and  52  opposite to each other. An output terminal  40  may be on the first surface  51 . A battery cell  10  may be on the second surface  52  of the base substrate  50 . The battery cell  10  may include an accommodation portion  20  in which an electrode assembly (see  5  of  FIG. 6 ) is accommodated and a terrace portion T that seals the accommodation portion  20 . An electrode tab  15  may be connected to the electrode assembly  5  and may be drawn out of the accommodation portion through the terrace portion T. The electrode tab  15  and the terrace portion T may be bent toward the base substrate  50 . 
     Referring to  FIGS. 5A to 6 , the battery cell  10  may include the electrode assembly  5 , the accommodation portion  20  accommodating the electrode assembly  5 , and a sealing portion TS (see  FIG. 5A ) extending along edges of the accommodation portion  20  to seal the accommodation portion  20 . The electrode assembly  5  may be formed in a roll shape by winding first and second electrode plates  1  and  2  (arranged to face each other) with a separator  3  therebetween, or may be formed in a stack shape by stacking a plurality of first and second electrode plates  1  and  2  with the separator  3  therebetween. An electrode tab  15  (forming a charge/discharge path) may be connected to the electrode assembly  5 . The electrode tab  15  may include first and second electrode tabs  15   a  and  15   b  of different polarities that are electrically connected to the electrode assembly  5 , and the electrode tab  15  connected to the electrode assembly  5  in the accommodation portion  20  may be drawn out through a front surface  23  of the accommodation portion  20 . 
     Referring to  FIG. 5A , in an embodiment, the accommodation portion  20  (in which the electrode assembly  5  is accommodated) may have a substantially cuboid shape. In an implementation, the accommodation portion  20  may include the front surface  23  (through which the electrode tab  15  is drawn), a rear surface  24  opposite to the front surface  23 , a pair of main surfaces  21  and  22  connecting the front surface  23  to the rear surface  24  and occupying or having a relatively large area, and a pair of side surfaces  25  connecting the front surface  23  to the rear surface  24  and occupying or having a relatively small area. The main surfaces  21  and  22  may have the largest area among the surfaces of the accommodation portion  20 , e.g., may have a larger area than each of the front surface  23 , the rear surface  24 , and the side surfaces  25 . In an implementation, the front surface  23 , the rear surface  24 , and, the pair of side surfaces  25  may be connected to the main surfaces  21  and  22  at different edges along the main surfaces  21  and  22  of the accommodation portion  20 . In an implementation, the main surfaces  21  and  22  and the side surfaces  25  may be in pairs at positions facing each other. In an implementation, the main surfaces  21  and  22  may include first and second main surfaces  21  and  22  facing each other. 
     The battery cell  10  may further include the sealing portion TS along the edges of the accommodation portion  20  to seal the accommodation portion  20 . In an implementation, the accommodation portion  20  (accommodating the electrode assembly  5 ) and the sealing portion TS (sealing the accommodation portion  20 ) may be formed from an exterior material P (see  FIG. 6 ) continuously surrounding the electrode assembly  5 . In an implementation, the exterior material P may form the accommodation portion  20  (accommodating the electrode assembly  5 ) while surrounding the electrode assembly  5 , and the other exterior material P remaining after forming the accommodation portion  20  may form the sealing portion TS sealing the accommodation portion  20 . 
     The exterior material P (see  FIG. 6 ) may be a flexible exterior material P, e.g., a pouch. In an implementation, the exterior material P may include a metal layer Pc (e.g., a thin aluminum plate) and insulating layers Pa and Pb (e.g., resin coating layers) on both sides of the metal layer Pc. In an implementation, the metal layer Pc may be exposed to the outside through a cross-section at which the exterior material P is terminated (e.g., at an outer edge of the exterior material P), and as described below, the metal layer Pc may be exposed through or at the edge of the sealing portion TS at which first and second exterior materials P 1  and P 2  coupled to face each other are coupled to each other. Referring to  FIGS. 5A and 5B , different portions of the sealing portion TS may be folded toward the side surface  25  and the front surface  23  of the accommodation portion  20  such that the metal layer Pc exposed at the edge of the sealing portion TS may not protrude from the side surface  25  and the front surface  23  of the accommodation portion  20 . 
     Referring to  FIG. 6 , the exterior material P may include first and second exterior materials P 1  and P 2  coupled to face each other with the electrode assembly  5  therebetween, and by folding the first and second exterior materials P 1  and P 2  to overlap each other through a folding portion F connecting the first and second exterior materials P 1  and P 2  to each other in a state where the electrode assembly  5  is located therebetween and then coupling portions contacting each other along the edge regions of the first and second exterior materials P 1  and P 2  to each other by thermal bonding or the like, the inner regions of the first and second exterior materials P 1  and P 2  facing each other with the electrode assembly  5  therebetween may be formed as the accommodation portion  20 , and the edge regions of the first and second exterior materials P 1  and P 2  coupled to each other may be formed as the sealing portion TS. 
     The sealing portion TS may be formed along or at the edge regions of the first and second exterior materials P 1  and P 2  and may be formed along the side portions of the first and second exterior materials P 1  and P 2  (excluding the folding portion F). 
     Referring to  FIGS. 5A and 5B , the sealing portion TS may include the terrace portion T extending from or along the front surface  23  of the accommodation portion  20  and a side sealing portion S extending from or along the side surface  25  of the accommodation portion  20 . In an implementation, the terrace portion T and the side sealing portion S may be spaced apart from each other with a gap g therebetween, and as described below, the terrace portion T and the side sealing portion S may be respectively folded up toward different surfaces of the accommodation portion  20 , e.g., the front surface  23  and the side surface  25 , through or due to the gap g therebetween, and physical interference therebetween may be avoided. In an implementation, the electrode tab  15  (connected to the electrode assembly  5  in the accommodation portion  20 ) may be drawn out of the accommodation portion  20  through the terrace portion T extending from or along the front surface  23  of the accommodation portion  20 . 
     The side sealing portion S may be folded up toward or along the side surface  25  of the accommodation portion  20 , and the terrace portion T (from which the electrode tab  15  is drawn) may be folded up toward or along the front surface  23  of the accommodation portion  20 . In an implementation, the side sealing portion S and the terrace portion T surrounding the accommodation portion  20  may be respectively folded up toward or along the side surfaces  25  and the front surface  23  of the accommodation portion  20 , and the area occupied by the entire battery cell  10  may be reduced. In an implementation, the metal layer Pc (exposed at the edge of the side sealing portion S and the edge of the terrace portion T) may be respectively folded up toward or along the side surface  25  and the front surface  23  of the accommodation portion  20 , and it may not protrude toward the side surface  25  and the front surface  23  of the accommodation portion  20 . In an implementation, the electrode tab  15  drawn through the terrace portion T may be folded up toward or along the front surface  23  of the accommodation portion  20  together with the terrace portion T. In an implementation, the electrode tab  15  may be folded up toward the first main surface  21 . Like the terrace portion T, the side sealing portion S may also be folded up toward the first main surface  21 . Here, the first main surface  21  may refer to the main surface  21  located relatively far from (e.g., distal to) the terrace portion T (e.g., where the sealing portion TS meets the accommodation portion  20 ) along a direction (e.g., Y direction) in which the pair of main surfaces  21  and  22  face each other or the main surface  21  distal to the sealing portion TS including the terrace portion T and the side sealing portion S, among the pair of main surfaces  21  and  22  facing each other (e.g., the second main surface  22  may be proximate to where the sealing portion TS meets the accommodation portion  20 ). When the terrace portion T and the side sealing portion S are respectively folded up toward or along the front surface  23  and the side surface  25  of the accommodation portion  20 , they may be folded up toward the first main surface  21  located distal thereto, and a height to which the folded-up terrace portion T and side sealing portion S may be accommodated may be secured and for example, an additional height may not be formed from the first main surface  21  (e.g., the folded terrace portion T and side sealing portion S may not extend beyond the first main surface  21 ). 
     Referring back to  FIGS. 1 to 4 , the battery cell  10  may be on the base substrate  50 . The output terminal  40  (see  FIG. 1 ) electrically connected to the battery cell  10  may be on the base substrate  50 . The discharge power of the battery cell  10  may be provided to an external load through the output terminal  40 , and the charge power from an external charger may be supplied to the battery cell  10 . The output terminal  40  may include first and second output terminals  41   a,    41   b,    42   a,  and  42   b  of different polarities. In an implementation, the output terminal  40  may include a first terminal group  41  including a pair of first and second output terminals  41   a  and  41   b  of different polarities and a second terminal group  42  including another pair of first and second output terminals  42   a  and  42   b  of different polarities. In an implementation, the first and second output terminals  41   a  and  41   b  forming the first terminal group  41  may be spaced apart from each other along the direction in which the first and second electrode tabs  15   a  and  15   b  of the battery cell  10  face each other (e.g., X direction), and likewise, the first and second output terminals  42   a  and  42   b  forming the second terminal group  42  may be spaced apart from each other along the direction in which the first and second electrode tabs  15   a  and  15   b  of the battery cell  10  face each other. The first terminal group  41  and the second terminal group  42  may be spaced apart from each other along a direction (e.g., Z direction) intersecting with the direction in which the first and second electrode tabs  15   a  and  15   b  face each other. In an implementation, even when the first and second terminal groups  41  and  42  are spaced apart from each other, the first output terminal  41   a  of the first terminal group  41  and the first output terminal  42   a  of the second terminal group  42  may have the same polarity and may have the same potential. In an implementation, the second output terminal  41   b  of the first terminal group  41  and the second output terminal  42   b  of the second terminal group  42  may have the same polarity and may have the same potential. In an implementation, the first output terminals  41   a  and  42   a  having the same polarity and the second output terminals  41   b  and  42   b  having the same polarity may be arranged in pairs on the base substrate  50 , the connection of the external load or the external charger electrically connected to the battery cell  10  may be easily made, and the electrical connection with the external load or the external charger may be easily made regardless of the terminal position of the external load or the external charger. 
     The base substrate  50  may include the first and second surfaces  51  and  52  opposite to each other, the output terminal  40  may be on the first surface  51  of the base substrate  50 , and the battery cell  10  may be on the second surface  52  of the base substrate  50 . In an implementation, the second surface  52  of the base substrate  50  and the first main surface  21  of the accommodation portion  20  may be arranged in parallel to face each other. In an implementation, an adhesive member may be between the second surface  52  of the base substrate  50  and the first main surface  21  of the accommodation portion  20 . The adhesive member may bind or adhere the accommodation portion  20  and the base substrate  50  to each other. In an implementation, a double-sided tape may be applied as the adhesive member. 
     In an implementation, a tab tape  80  (see  FIG. 3 ) for protecting a coupling portion C of the electrode tab  15  extending from the accommodation portion  20  and a connection tab  55  extending from the base substrate  50  may be between the second surface  52  of the base substrate  50  and the first main surface  21  of the accommodation portion  20 . The tab tape  80  may also function as the adhesive member for adhering the second surface  52  of the base substrate  50  and the first main surface  21  of the accommodation portion  20  to each other. In an implementation, by using the tab tape  80  having an adhesive component on both sides, one side thereof may be attached to the coupling portion C of the electrode tab  15  and the connection tab  55  and the other side thereof may be attached to the second surface  52  of the base substrate  50  or the first main surface  21  of the accommodation portion  20 . 
     In an implementation, as illustrated in  FIGS. 2 to 4 , a connection tab  55  may be on the second surface  52  of the base substrate  50 . In an implementation, the connection tab  55  may protrude from the second surface  52  of the base substrate  50 . The connection tab  55  may include first and second connection tabs  55   a  and  55   b  respectively connected to the first and second electrode tabs  15   a  and  15   b  of the battery cell  10 . As such, the first electrode tab  15   a  and the first connection tab  55   a  connected to each other may form a first tab  60   a  connecting the battery cell  10  and the base substrate  50  to each other and also, the second electrode tab  15   b  and the second connection tab  55   b  connected to each other may form a second tab  60   b  connecting the battery cell  10  and the base substrate  50  to each other. In an implementation, the first electrode tab  15   a  and the first connection tab  55   a  may be coupled to each other through welding such as laser welding and likewise, the second electrode tab  15   b  and the second connection tab  55   b  may be coupled to each other through welding such as laser welding. In this case, a tab tape  80  (see  FIG. 3 ) may surround the coupling portion C between the first and second electrode tabs  15   a  and  15   b  and the first and second connection tabs  55   a  and  55   b,  and the coupling portion C between the first and second electrode tabs  15   a  and  15   b  and the first and second connection tabs  55   a  and  55   b  may be surrounded by the tab tape  80  to be protected from the outside. In an implementation, the tab tape  80  may protect the coupling portion C from an external environment such as oxygen or moisture. In an implementation, the tab tape  80  may include a pair of tab tapes  80  coupled to face each other with the coupling portion C therebetween. In an implementation, the tab tape  80  may be formed of a polymer resin material, e.g., may be formed of a material such as polyimide. 
     Referring to  FIG. 4 , the first and second tabs  60   a  and  60   b  may be between the base substrate  50  and the accommodation portion  20  of the battery cell  10  (e.g., in the Y direction). In an implementation, the first electrode tab  15   a  (forming a portion of the first tab  60   a ) may be between the accommodation portion  20  and the base substrate  50  and may be curved to surround (e.g., may be bent around) the accommodation portion  20  from the terrace portion T (e.g., that is bent toward the base substrate  50 ). In an implementation, the terrace portion T may be bent toward the base substrate  50  (e.g., may be folded toward or along the front surface  23  of the accommodation portion  20 ). In an implementation, a portion of the first electrode tab  15   a  may be between the accommodation portion  20  and the base substrate  50 . In an implementation, the first electrode tab  15   a  may be bent to include a portion that is parallel to the base substrate  50  and a portion that is parallel with the folded terrace portion T. Likewise, the second electrode tab  15   b  (forming a portion of the second tab  60   b ) may include a portion between the accommodation portion  20  and the base substrate  50 . For example, the second electrode tab  15   b  may be bent to include a portion that is parallel to the base substrate  50  and a portion that is parallel with the folded terrace portion T. 
     Hereinafter, the coupling of the battery cell  10  and the base substrate  50  will be described in more detail. First, as illustrated in  FIG. 3 , the battery cell  10  and the base substrate  50  may be aligned with each other; e.g., the battery cell  10  and the base substrate  50  may be aligned such that the first and second electrode tabs  15   a  and  15   b  extending from the terrace portion T and the first and second connection tabs  55   a  and  55   b  extending from the base substrate  50  may face each other. In an implementation, when the first and second electrode tabs  15   a  and  15   b  and the first and second connection tabs  55   a  and  55   b  are arranged to face each other, the first main surface  21  of the accommodation portion  20  and the second surface  52  of the base substrate  50  may be arranged alternately (e.g., offset) with each other. In an implementation, in a state where the first main surface  21  of the accommodation portion  20  and the second surface  52  of the base substrate  50  are offset with each other rather than facing each other, the first and second electrode tabs  15   a  and  15   b  and the first and second connection tabs  55   a  and  55   b  may be arranged to face each other. In an implementation, the first and second electrode tabs  15   a  and  15   b  may be over the accommodation portion  20  along the upright direction of the accommodation portion  20  and the base substrate  50  (e.g., at a top end of the accommodation portion  20 ), and the first and second connection tabs  55   a  and  55   b  may be under the base substrate  50  (e.g., at a bottom end of the base substrate  50 ). 
     After the first and second electrode tabs  15   a  and  15   b  and the first and second connection tabs  55   a  and  55   b  are coupled with each other to form the first and second tabs  60   a  and  60   b,  the first and second tabs  60   a  and  60   b  may be in parallel and between the accommodation portion  20  and the base substrate  50  (e.g., as the accommodation portion  20  and the base substrate  50  are moved toward each other. In an implementation, the accommodation portion  20  may be moved upwardly and the base substrate  50  may be moved downwardly along the upright direction of the accommodation portion  20  and the base substrate  50 , such that the first main surface  21  of the accommodation portion  20  and the second surface  52  of the base substrate  50  (previously offset) now face each other. In this case, the first and second tabs  60   a  and  60   b  may be located in parallel between the first main surface  21  of the accommodation portion  20  and the second surface  52  of the base substrate  50  while being bent to surround the accommodation portion  20 , e.g., the accommodation portion  20  and the base substrate  50  may approach each other along the upright direction thereof while a portion of the first and second electrode tabs  15   a  and  15   b  extending from the terrace portion T and a portion of the first and second connection tabs  55   a  and  55   b  extending from the base substrate  50  are bent. As illustrated in  FIG. 4 , the first and second tabs  60   a  and  60   b  may be located in parallel between the accommodation portion  20  and the base substrate  50 . In an implementation, an adhesive member may be between the first and second tabs  60   a  and  60   b  and the accommodation portion  20  and/or between the first and second tabs  60   a  and  60   b  and the base substrate  50 , and the adhesive member may bind the accommodation portion  20  and the base substrate  50  to each other. In an implementation, the adhesive member may be between the accommodation portion  20  and the base substrate  50  at a position where the first and second tabs  60   a  and  60   b  are excluded (e.g., are not located). In an implementation, a double-sided tape may be applied as the adhesive member. 
     In an implementation, the tab tape  80  (see  FIG. 3 ) covering and protecting the coupling portion C of the connection tab  55  extending from the base substrate  50  and the electrode tab  15  extending from the accommodation portion  20  may be between the accommodation portion  20  and the base substrate  50 . The tab tape  80  may also function as the adhesive member for binding the accommodation portion  20  and the base substrate  50  to each other. 
     The base substrate  50  may include an insulating substrate and may include an insulating substrate having the output terminal  40  and the connection tab  55  at or on opposite surfaces thereof. The output terminal  40  at the first surface  51  of the base substrate  50  and the connection tab  55  at the second surface  52  of the base substrate  50  may be electrically connected to each other. The first and second output terminals  41   a ,  41   b,    42   a,  and  42   b  at the first surface  51  may be respectively electrically connected to the first and second connection tabs  55   a  and  55   b  at the second surface  52 . In an implementation, a line pattern for electrically connecting the first and second output terminals  41   a,    41   b,    42   a,  and  42   b  and the first and second connection tabs  55   a,    55   b  to each other may be in the base substrate  50 . 
       FIG. 7  is a perspective view of a battery pack according to another embodiment.  FIG. 8  is an exploded perspective view of the battery pack of  FIG. 7 .  FIG. 9  is a side view of the battery pack of  FIG. 7 . 
     Referring to  FIGS. 7 to 9 , an output terminal  140  may be on a first surface  151  of a base substrate  150 , and a battery cell  10  may be on a second surface  152  of the base substrate  150 . In an implementation, an electrode tab  15  (drawn from a terrace portion T bent toward the base substrate  150 ) may extend from or through the second surface  152  of the base substrate  150  onto the first surface  151  of the base substrate  150 , e.g., through a tab hole  155  in the base substrate  150 . In an implementation, the tab hole  155  in the base substrate  150  may include first and second tab holes  155   a  and  155   b  respectively at positions corresponding to first and second electrode tabs  15   a  and  15   b.    
     The electrode tab  15  extending through the second surface  152  of the base substrate  150  onto the first surface  151  through the tab hole  155  of the base substrate  150  may overlap on the first surface  151  of the base substrate  150  while being bent in parallel to the first surface  151  of the base substrate  150  around the tab hole  155 . In an implementation, the electrode tab  15  may overlap on the output terminal  140  on the first surface  151  of the base substrate  150 . In an implementation, the electrode tab  15  overlapping on the output terminal  140  may be bound onto or adhered to the output terminal  140  by a conductive tape  92 . In an implementation, the output terminal  140  on the first surface  151  of the base substrate  150  may include first and second output terminals  141   a,    141   b,    142   a,  and  142   b  electrically connected to the first and second electrode tabs  15   a  and  15   b  of the battery cell  10 . In an implementation, the output terminal  140  may include a first terminal group  141  including the pair of first and second output terminals  141   a  and  141   b  of different polarities and a second terminal group  142  including the other pair of first and second output terminals  142   a  and  142   b  of different polarities. In an implementation, the electrode tab  15  may overlap on the first terminal group  141  and may be bound onto the first terminal group  141  by the conductive tape  92 . 
     In an implementation, the first and second terminal groups  141  and  142  may be spaced apart from each other along the lengthwise direction of the electrode tab  15  extending on the first surface  151  (e.g., the Z direction), and in this case, the electrode tab  15  may be bound onto the first terminal group  141  among the first and second terminal groups  141  and  142 , e.g., onto the first terminal group  141  where the length of the electrode tab  15  may be shortened along the lengthwise direction of the electrode tab  15 . In an implementation, the electrode tab  15  may be bound onto the first terminal group  141  relatively close or proximate to the tab hole  155  along the lengthwise direction of the electrode tab  15 . In an implementation, the second terminal group  142  may not be directly connected to the electrode tab  15 , e.g., an external load or an external charger may be connected to the second terminal group  142 . In an implementation, an external load or an external charger may be connected not only to the second terminal group  142  (not directly connected to the electrode tab  15 ) but also to the first terminal group  141  (directly connected to the electrode tab  15 ). In an implementation, the conductive tape  92  attached onto the first terminal group  141  with the electrode tab  15  therebetween may provide a connection point with the external load or the external charger. 
     The first terminal group  141  (to which the electrode tab  15  is bound or attached) may have a substantially rectangular shape extending long (e.g., having a long axis) along the lengthwise direction of the electrode tab  15  (e.g., the Z direction) to increase a contact area with the electrode tab  15 . The second terminal group  142  (to which the electrode tab  15  is not bound or directly attached) may have a substantially rectangular shape extending long (e.g., having a long axis) along a direction intersecting with the lengthwise direction of the electrode tab  15  (e.g., the X direction) such that the electrical connection with the external load or the external charger may be easily made regardless of the terminal position of the external load or the external charger. 
     An adhesive member  91  may be between the first main surface  21  of the accommodation portion  20  and the second surface  152  of the base substrate  150  to bind the accommodation portion  20  and the base substrate  150  to each other. In an implementation, the adhesive member  91  may include a double-sided tape. 
     In an implementation, the electrode tab  15  of the battery cell  10  may be directly connected to the output terminal  140  of the base substrate  150  and may pass through the tab hole  155  in the base substrate  150 , and the connection tab  55  illustrated in  FIG. 2  may be omitted. 
     The base substrate  150  may include an insulating substrate and may include an insulating substrate having an output terminal  140  on one surface thereof. A line pattern for electrically connecting the first terminal group  141  and the second terminal group  142  (forming the output terminal  140 ) may be in the base substrate  150 . 
     The remaining technical details of the battery cell  10  illustrated in  FIG. 7  are substantially identical or similar to those described with reference to  FIGS. 5A to 6 , and thus repeated descriptions thereof may be omitted for conciseness. 
     In an implementation, the base substrate  50  or  150  (including the output terminal  40  or  140  for mediating the flow of a charge/discharge current) may be applied between the battery cell  10  and a set device mounted with the battery pack including the battery cell  10 , and the connection structure between the battery cell  10  and the output terminals  40  or  140  may be simplified to provide a battery pack advantageous for miniaturization. 
     In an implementation, the first and second electrode tabs  15   a  and  15   b  of the battery cell  10  may be respectively formed of the same metal materials as the first and second electrode plates  1  and  2  of the electrode assembly  5  or formed of high-affinity metal materials with respect thereto, and the first and second electrode tabs  15   a  and  15   b  of the battery cell  10  may not be suitable for use as an output terminal. In an implementation, the battery pack may include output terminals having a different metal material than the first and second electrode tabs  15   a  and  15   b,  e.g., a different metal material than at least one of the first and second electrode tabs  15   a  and  15   b,  may include the base substrate  50  or  150  including the output terminal  40  or  140  having a larger width than the first and second electrode tabs  15   a  and  15   b,  and the electrical connection between the output terminal  40  or  140  and the set device may be smoothly made. In an implementation, the battery cell  10  may be protected from an external impact through the base substrate  50  or  150  on the battery cell  10 . In an implementation, the base substrate  50  or  150  may have substantially the same size as the battery cell  10  or may have a somewhat larger size than the battery cell  10 , and the battery cell  10  may be protected without a burden to the size of the entire battery pack. 
     According to the disclosure, it is possible to provide a battery pack that is advantageous for miniaturization by simplifying the electrical connection structure between a battery cell and an output terminal and the protection structure of the battery cell. 
     One or more embodiments may provide a battery pack that is advantageous for miniaturization by simplifying the electrical connection structure between a battery cell and an output terminal and the protection structure of the battery cell. 
     Example embodiments have been disclosed herein, and although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, as would be apparent to one of ordinary skill in the art as of the filing of the present application, features, characteristics, and/or elements described in connection with a particular embodiment may be used singly or in combination with features, characteristics, and/or elements described in connection with other embodiments unless otherwise specifically indicated. Accordingly, it will be understood by those of skill in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as set forth in the following claims.