Battery pack

Abstract

A battery pack is disclosed. The battery pack includes: a base substrate including a first surface and a second surface opposite to each other; an output terminal on the first surface; and a battery cell on the second surface of the base substrate, the battery cell including an accommodating portion in which the electrode assembly is accommodated, and a step portion sealing the accommodating portion and bending toward the base substrate, from which an electrode tab connected to the electrode assembly is led out and electrically connected to the output terminal.

Description

[0001] This application is a divisional application of the invention patent application "Battery Pack" with the application date of December 11, 2020 and the application number of 202011459064.X. Technical Field

[0002] The embodiment relates to a battery pack. Background Art

[0003] Unlike primary batteries, secondary batteries are rechargeable. Secondary batteries can be used as an energy source for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, etc. Depending on the type of external device to which the secondary battery is applied, the secondary battery can be used in the form of a single battery or in the form of a battery module in which multiple batteries are connected and combined into one unit.

[0004] Small mobile devices such as mobile phones can operate for a certain period of time according to the output and capacity of a single battery; however, in the case of long-term driving or high-power driving (such as in the case of an electric vehicle or a hybrid vehicle with high power consumption), due to output and capacity issues, a battery module including multiple batteries may be preferred, and the battery module can increase the output voltage or output current according to the number of built-in batteries. Summary of the Invention

[0005] The embodiment can be achieved by providing a battery pack, which includes: a base substrate including a first surface and a second surface opposite to each other, and output terminals located on the first surface; and battery cells located on the second surface of the base substrate, each battery cell including a receiving portion in which an electrode assembly is received and a stepped portion that seals the receiving portion and bends toward the base substrate, and an electrode tab connected to the electrode assembly is led out from the stepped portion and electrically connected to the output terminals.

[0006] The first main surface of the receiving portion and the second surface of the base substrate may be arranged parallel to each other.

[0007] The receiving portion may include: a front surface where the electrode tab is led out; a rear surface opposite to the front surface; first and second main surfaces connecting the front surface to the rear surface, and both the first and second main surfaces have the largest area among the surfaces of the receiving portion; and a pair of side surfaces connecting the front surface to the rear surface, and both the pair of side surfaces have an area smaller than the area of each of the first and second main surfaces.

[0008] Both the first and second main surfaces may have an area larger than the area of each of the front surface, rear surface, and side surfaces of the receiving portion.

[0009] The first main surface may correspond to the main surface that is away from the stepped portion along the direction in which the first and second main surfaces face each other.

[0010] The battery pack may further include an adhesive member located between the first main surface of the accommodating portion and the second surface of the base substrate.

[0011] The adhesive member may include a double-sided tape.

[0012] The battery cell may include a sealing portion formed along the edge of the accommodating portion to seal the accommodating portion, and the sealing portion may include a step portion extending from the accommodating portion in the forward direction of the accommodating portion and a side sealing portion extending from the accommodating portion in the lateral direction of the accommodating portion.

[0013] The step portion and the side sealing portion may be separated from each other and a gap is located between the step portion and the side sealing portion, and they are respectively folded upward toward the front surface and the side surface of the accommodating portion.

[0014] The electrode tabs may include a first electrode tab and a second electrode tab of different polarities.

[0015] The output terminals may include: a first terminal group including a pair of first output terminals and a second output terminal of different polarities; and a second terminal group including a pair of first output terminals and a second output terminal of different polarities.

[0016] The first output terminal and the second output terminal forming the first terminal group may be separated from each other along the same direction as the direction in which the first electrode tab and the second electrode tab of the battery cell are separated, and the first output terminal and the second output terminal forming the second terminal group may be separated from each other along the same direction as the direction in which the first electrode tab and the second electrode tab of the battery cell are separated.

[0017] The first terminal group and the second terminal group may be separated from each other along a direction intersecting with the direction in which the first electrode tab and the second electrode tab are separated.

[0018] The battery pack may further include a connection tab located on the second surface of the base substrate, and the connection tab protrudes from the second surface and is electrically connected to the electrode tab.

[0019] The electrode tabs may include a first electrode tab and a second electrode tab of different polarities, the connection tab may include a first connection tab and a second connection tab respectively connected to the first electrode tab and the second electrode tab, and the first tab including the first electrode tab and the first connection tab connected to each other and the second tab including the second electrode tab and the second connection tab connected to each other may both be located between the first main surface of the accommodating portion and the second surface of the base substrate.

[0020] The battery pack may further include tab bands around the junctions of the first electrode tab and the first connection tab and around the junctions of the second electrode tab and the second connection tab.

[0021] The first tab and the second tab may be located between the first main surface of the accommodating portion and the second surface of the base substrate, and the first tab and the second tab are bent from the stepped portion toward the base substrate to be bent around the accommodating portion.

[0022] The battery pack may further include tab holes penetrating the first surface and the second surface of the base substrate in the base substrate, wherein the electrode tab extends from the stepped portion toward the base substrate through the tab hole on one side of the second surface of the base substrate to the first surface of the base substrate.

[0023] The electrode tab may be bent around the tab hole to be parallel to the first surface of the base substrate so as to overlap the first surface.

[0024] The electrode tab may overlap with the output terminal located on the first surface of the base substrate and be coupled to the output terminal.

[0025] The battery pack may further include a conductive band attached to the electrode tab overlapping with the output terminal.

[0026] The output terminal may include: a first terminal group including a pair of first output terminals and second output terminals of different polarities; and a second terminal group including a pair of first output terminals and second output terminals of different polarities. The first terminal group and the second terminal group may be separated from each other along the length direction of the electrode tab extending on the first surface, and the electrode tab may be coupled to the first terminal group that is closer to the tab hole in the length direction of the electrode tab among the first terminal group and the second terminal group. Description of the Drawings

[0027] Features will be clear to those skilled in the art by referring to the accompanying drawings in which exemplary embodiments are described in detail: Figure 1 is a perspective view of a battery pack according to an embodiment; Figure 2 and Figure 3 is Figure 1 a different exploded perspective view of the battery pack; Figure 4 is Figure 1 a side view of the battery pack; Figure 5A and Figure 5B is Figure 1 a perspective view of a battery cell showing the shapes of the electrode tab before and after bending; Figure 6 is alongFigure 5A Cross-sectional view of a battery cell taken along line VI-VI' of Figure 7 Perspective view of a battery pack according to another embodiment; Figure 8 is Figure 7 Exploded perspective view of the battery pack of ; and Figure 9 is Figure 7 Side view of the battery pack of . Detailed Description

[0028] Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments 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 the exemplary embodiments to those skilled in the art.

[0029] In the drawings, the dimensions of layers and regions may be exaggerated for clarity. It will also be understood that when a layer or element is referred to as being "on" another layer or element, the layer or element may be directly on the other layer or element, or an intermediate layer may also be present. Additionally, it will be understood that when a layer is referred to as being "between" two layers, the layer may be the only layer between the two layers, or one or more intermediate layers may also be present. Like reference numerals always denote like elements.

[0030] Accordingly, the embodiments will be described hereinafter only by referring to the drawings to explain aspects of the present specification. As used herein, the terms "or" and "and / or" include any combination and all combinations of one or more of the associated listed items. Expressions such as "at least one (s / er) of..." modify the entire list of elements when following the list of elements, rather than individual elements of the list.

[0031] Hereinafter, a battery pack according to an example embodiment will be described with reference to the drawings.

[0032] Figure 1 Perspective view of a battery pack according to an embodiment. Figure 2 and Figure 3 are Figure 1 different exploded perspective views of the battery pack of . Figure 4 is Figure 1 Side view of the battery pack of . Figure 5A and Figure 5B are Figure 1 Perspective views of a battery cell showing the shape of the electrode tab before and after bending. Figure 6 is along Figure 5A Cross-sectional view of a battery cell taken along line VI-VI' of .

[0033] Referring to Figures 1 to 4 , the battery pack may include a base substrate 50, and the base substrate 50 includes a first surface 51 and a second surface 52 that face each other. The output terminal 40 may be on the first surface 51. The battery cell 10 may be on the second surface 52 of the base substrate 50. The battery cell 10 may include a receiving portion 20 in which an electrode assembly (see Figure 6 5) is received and a stepped portion T that seals the receiving portion 20. The electrode tab 15 may be connected to the electrode assembly 5 and may extend out of the receiving portion through the stepped portion T. The electrode tab 15 and the stepped portion T may be bent toward the base substrate 50.

[0034] Referring to Figures 5A to 6 , the battery cell 10 may include an electrode assembly 5, a receiving portion 20 that receives the electrode assembly 5, and a sealing portion TS (see Figure 5A ) that extends along the edge of the receiving portion 20 to seal the receiving portion 20. The electrode assembly 5 may be formed in a wound shape by winding (arranged to face each other) a first electrode plate 1 and a second electrode plate 2 (with a separator 3 therebetween), or may be formed in a stacked shape by stacking a plurality of first electrode plates 1 and second electrode plates 2 (with a separator 3 therebetween). The electrode tab 15 (forming a charge / discharge path) may be connected to the electrode assembly 5. The electrode tab 15 may include a first electrode tab 15a and a second electrode tab 15b that are electrically connected to different polarities of the electrode assembly 5, and the electrode tab 15 connected to the electrode assembly 5 in the receiving portion 20 may extend out through the front surface 23 of the receiving portion 20.

[0035] Referring to Figure 5A , in an embodiment, the receiving portion 20 (in which the electrode assembly 5 is received) may have a substantially rectangular parallelepiped shape. In an embodiment, the receiving portion 20 may include a front surface 23 (through which the electrode tab 15 extends out), a rear surface 24 opposite to the front surface 23, a pair of main surfaces 21 and 22 that connect the front surface 23 to the rear surface 24 and occupy or have a relatively large area, and a pair of side surfaces 25 that connect the front surface 23 to the rear surface 24 and occupy or have a relatively small area. The main surfaces 21 and 22 may have the largest area among the surfaces of the receiving portion 20, for example, may have an area larger than each of the front surface 23, the rear surface 24, and the side surfaces 25. In an embodiment, 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 receiving portion 20. In an embodiment, the main surfaces 21 and 22 and the side surfaces 25 may be paired at positions facing each other. In an embodiment, the main surfaces 21 and 22 may include a first main surface 21 and a second main surface 22 that face each other.

[0036] The battery cell 10 may further include a sealing portion TS that seals the receiving portion 20 along the edge of the receiving portion 20. In an embodiment, the receiving portion 20 (for receiving the electrode assembly 5) and the sealing portion TS (for sealing the receiving portion 20) may be formed of an outer material P that continuously surrounds the electrode assembly 5 (see Figure 6 ). In an embodiment, the outer material P may form the receiving portion 20 (for receiving the electrode assembly 5) while surrounding the electrode assembly 5, and the remaining other outer material P after forming the receiving portion 20 may form the sealing portion TS that seals the receiving portion 20.

[0037] The outer material P (see Figure 6 ).) may be a flexible outer material P, such as a bag. In an embodiment, the outer material P may include a metal layer Pc (e.g., a thin aluminum plate) and insulating layers Pa and Pb (e.g., resin-coated layers) on both sides of the metal layer Pc. In an embodiment, the metal layer Pc may be exposed to the outside through a cross-section where the outer material P terminates (e.g., at the outer edge of the outer material P). As described below, the metal layer Pc may be exposed at the edge where the first outer material P1 and the second outer material P2 that face each other are joined by the sealing portion TS or at the edge where the first outer material P1 and the second outer material P2 that face each other are joined by the sealing portion TS. Referring to Figure 5A and Figure 5B , different portions of the sealing portion TS may be folded toward the side surface 25 and the front surface 23 of the receiving portion 20 so 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 receiving portion 20.

[0038] Referring to Figure 6 , the outer material P may include a first outer material P1 and a second outer material P2 that face each other (with the electrode assembly 5 therebetween). In a state where the electrode assembly 5 is therebetween, by folding the first outer material P1 and the second outer material P2 so as to be stacked on each other via a folding portion F that connects the first outer material P1 and the second outer material P2 to each other, and then joining the portions that are in contact with each other along the edge regions of the first outer material P1 and the second outer material P2 to each other by thermal bonding or the like, the inner region of the first outer material P1 and the second outer material P2 that face each other (and with the electrode assembly 5 therebetween) may be formed as the receiving portion 20, and the edge regions where the first outer material P1 and the second outer material P2 are joined to each other may be formed as the sealing portion TS.

[0039] The sealing portion TS may be formed along the edge regions of the first outer material P1 and the second outer material P2 or formed at the edge regions of the first outer material P1 and the second outer material P2, and may be formed along the sides of the first outer material P1 and the second outer material P2 (excluding the folding portion F).

[0040] Referring to Figure 5A and Figure 5B ,the sealing portion TS may include a stepped portion T and a side sealing portion S. The stepped portion T extends from or along the front surface 23 of the accommodating portion 20, and the side sealing portion S extends from or along the side surface 25 of the accommodating portion 20. In an embodiment, the stepped portion T and the side sealing portion S may be separated from each other and a gap g is located therebetween. As described below, the stepped portion T and the side sealing portion S may be folded upwardly toward different surfaces (e.g., the front surface 23 and the side surface 25) of the accommodating portion 20 respectively by or due to the gap g located therebetween, and physical interference therebetween can be avoided. In an embodiment, the electrode tab 15 (connected to the electrode assembly 5 in the accommodating portion 20) may be led out of the accommodating portion 20 through the stepped portion T, and the stepped portion T extends from or along the front surface 23 of the accommodating portion 20.

[0041] The side seal portion S can be folded upward toward or along the side surface 25 of the receiving portion 20, and the step portion T (from which the electrode tab 15 is led out) can be folded upward toward or along the front surface 23 of the receiving portion 20. In an embodiment, the side seal portion S and the step portion T surrounding the receiving portion 20 can be folded upward toward or along the side surface 25 and the front surface 23 of the receiving portion 20 respectively, and the area occupied by the entire battery cell 10 can be reduced. In an embodiment, the metal layer Pc (exposed at the edges of the side seal portion S and the step portion T) can be folded upward toward or along the side surface 25 and the front surface 23 of the receiving portion 20 respectively, and the metal layer Pc can not protrude toward the side surface 25 and the front surface 23 of the receiving portion 20. In an embodiment, the electrode tab 15 led out through the step portion T can be folded upward together with the step portion T toward or along the front surface 23 of the receiving portion 20. In an embodiment, the electrode tab 15 can be folded upward toward the first main surface 21. Similar to the step portion T, the side seal portion S can also be folded upward toward the first main surface 21. Here, the first main surface 21 can refer to the main surface 21 that is positioned relatively far (e.g., away from the step portion T) along the direction (e.g., the Y direction) in which the pair of main surfaces 21 and 22 face each other (e.g., the position where the sealing portion TS and the receiving portion 20 meet), or the main surface 21 that is away from the sealing portion TS including the step portion T and the side seal portion S among the pair of main surfaces 21 and 22 that face each other (e.g., the second main surface 22 can be close to the position where the sealing portion TS and the receiving portion 20 meet). When the step portion T and the side seal portion S are folded upward toward or along the front surface 23 and the side surface 25 of the receiving portion 20 respectively, the step portion T and the side seal portion S can be folded upward toward the first main surface 21 away from which they are positioned, and the height to which the folded step portion T and side seal portion S can be received can be ensured, e.g., no additional height can be formed from the first main surface 21 (e.g., the folded step portion T and side seal portion S can not extend beyond the first main surface 21).

[0042] Return reference Figures 1 to 4 , the battery cell 10 can be on the base substrate 50. Electrically connected to the output terminal 40 of the battery cell 10 (see Figure 1)(It) can be on the base substrate 50. The discharge power of the battery cell 10 can be provided to an external load through the output terminal 40, and the charging power from an external charger can be supplied to the battery cell 10. The output terminal 40 can include a first output terminal and a second output terminal 41a, 41b, 42a, and 42b of different polarities. In an embodiment, the output terminal 40 can include a first terminal group 41 and a second terminal group 42. The first terminal group 41 includes a pair of first output terminals 41a and second output terminals 41b of different polarities, and the second terminal group 42 includes another pair of first output terminals 42a and second output terminals 42b of different polarities. In an embodiment, the first output terminal 41a and the second output terminal 41b forming the first terminal group 41 can be separated from each other along the direction (e.g., the X direction) in which the first electrode tab 15a and the second electrode tab 15b of the battery cell 10 face each other. Similarly, the first output terminal 42a and the second output terminal 42b forming the second terminal group 42 can be separated from each other along the direction in which the first electrode tab 15a and the second electrode tab 15b of the battery cell 10 face each other. The first terminal group 41 and the second terminal group 42 can be separated from each other along a direction (e.g., the Z direction) intersecting the direction in which the first electrode tab 15a and the second electrode tab 15b face each other. In an embodiment, even when the first terminal group 41 and the second terminal group 42 are separated from each other, the first output terminal 41a of the first terminal group 41 and the first output terminal 42a of the second terminal group 42 can have the same polarity and can have the same electric potential. In an embodiment, the second output terminal 41b of the first terminal group 41 and the second output terminal 42b of the second terminal group 42 can have the same polarity and can have the same electric potential. In an embodiment, the first output terminals 41a and 42a having the same polarity and the second output terminals 41b and 42b having the same polarity can be arranged in pairs on the base substrate 50, the connection to an external load or an external charger electrically connected to the battery cell 10 can be easily made, and the electrical connection to an external load or an external charger can be easily made regardless of the terminal positions of the external load or the external charger.

[0043] The base substrate 50 can include a first surface 51 and a second surface 52 facing each other. The output terminal 40 can be on the first surface 51 of the base substrate 50, and the battery cell 10 can be on the second surface 52 of the base substrate 50. In an embodiment, the second surface 52 of the base substrate 50 and the first main surface 21 of the accommodating portion 20 can be arranged in parallel to face each other. In an embodiment, an adhesive member can be between the second surface 52 of the base substrate 50 and the first main surface 21 of the accommodating portion 20. The adhesive member can join or adhere the accommodating portion 20 and the base substrate 50 to each other. In an embodiment, a double-sided tape can be used as the adhesive member.

[0044] In an embodiment, a tab tape 80 for protecting a joint portion C of an electrode tab 15 extending from a receiving portion 20 and a connection tab 55 extending from a base substrate 50 (see Figure 3 ) may be between a second surface 52 of the base substrate 50 and a first main surface 21 of the receiving portion 20. The tab tape 80 may also serve as an adhesive member for adhering the second surface 52 of the base substrate 50 and the first main surface 21 of the receiving portion 20 to each other. In an embodiment, by using the tab tape 80 having adhesive assemblies on both sides, one side of the tab tape 80 may be attached to the joint portion C of the electrode tab 15 and the connection tab 55, and the other side of the tab tape 80 may be attached to the second surface 52 of the base substrate 50 or the first main surface 21 of the receiving portion 20.

[0045] In an embodiment, as Figures 2 to 4 shown, the connection tab 55 may be on the second surface 52 of the base substrate 50. In an embodiment, the connection tab 55 may protrude from the second surface 52 of the base substrate 50. The connection tab 55 may include a first connection tab 55a and a second connection tab 55b that are respectively connected to a first electrode tab 15a and a second electrode tab 15b of the battery cell 10. Thus, the first electrode tab 15a and the first connection tab 55a connected to each other may form a first tab 60a that connects the battery cell 10 and the base substrate 50 to each other, and further, the second electrode tab 15b and the second connection tab 55b connected to each other may form a second tab 60b that connects the battery cell 10 and the base substrate 50 to each other. In an embodiment, the first electrode tab 15a and the first connection tab 55a may be joined to each other by welding (such as laser welding), and similarly, the second electrode tab 15b and the second connection tab 55b may be joined to each other by welding (such as laser welding). In this case, the tab tape 80 (see Figure 3 ) may surround the joint portion C between the first electrode tab 15a and the second electrode tab 15b and the first connection tab 55a and the second connection tab 55b, and the joint portion C between the first electrode tab 15a and the second electrode tab 15b and the first connection tab 55a and the second connection tab 55b may be surrounded by the tab tape 80 to be protected from external influences. In an embodiment, the tab tape 80 may protect the joint portion C from external environments such as oxygen or moisture. In an embodiment, the tab tape 80 may include a pair of tab tapes 80 joined to face each other with the joint portion C therebetween. In an embodiment, the tab tape 80 may be formed of a polymer resin material, for example, may be formed of a material such as polyimide.

[0046] Refer to Figure 4, the first connection tab 60a and the second connection tab 60b can be (e.g., in the Y direction) between the base substrate 50 and the receiving portion 20 of the battery cell 10. In an embodiment, the first electrode tab 15a (which forms a part of the first connection tab 60a) can be between the receiving portion 20 and the base substrate 50 and can be bent from a step portion T (e.g., bent toward the base substrate 50) to surround the receiving portion 20 (e.g., can be bent around the receiving portion 20). In an embodiment, the step portion T can be bent toward the base substrate 50 (e.g., can be folded toward or along the front surface 23 of the receiving portion 20). In an embodiment, a part of the first electrode tab 15a can be between the receiving portion 20 and the base substrate 50. In an embodiment, the first electrode tab 15a can be bent to include a portion parallel to the base substrate 50 and a portion parallel to the folded step portion T. Similarly, the second electrode tab 15b (which forms a part of the second connection tab 60b) can include a portion between the receiving portion 20 and the base substrate 50. For example, the second electrode tab 15b can be bent to include a portion parallel to the base substrate 50 and a portion parallel to the folded step portion T.

[0047] Hereinafter, the bonding of the battery cell 10 and the base substrate 50 will be described in more detail. First, as Figure 3 shown, the battery cell 10 and the base substrate 50 can be aligned with each other; for example, the battery cell 10 and the base substrate 50 can be aligned such that the first electrode tab 15a and the second electrode tab 15b extending from the step portion T and the first connection tab 55a and the second connection tab 55b extending from the base substrate 50 can face each other. In an embodiment, when the first electrode tab 15a and the second electrode tab 15b and the first connection tab 55a and the second connection tab 55b are arranged to face each other, the first main surface 21 of the receiving portion 20 and the second surface 52 of the base substrate 50 can be arranged alternately (e.g., offset) from each other. In an embodiment, in a state where the first main surface 21 of the receiving portion 20 and the second surface 52 of the base substrate 50 are offset from each other instead of facing each other, the first electrode tab 15a and the second electrode tab 15b and the first connection tab 55a and the second connection tab 55b can be arranged to face each other. In an embodiment, the first electrode tab 15a and the second electrode tab 15b can be above the receiving portion 20 (e.g., at the top end of the receiving portion 20) along the upright direction of the receiving portion 20 and the base substrate 50, and the first connection tab 55a and the second connection tab 55b can be below the base substrate 50 (e.g., at the bottom end of the base substrate 50).

[0048] After the first electrode tab 15a and the second electrode tab 15b, and the first connection tab 55a and the second connection tab 55b are joined to each other to form the first tab 60a and the second tab 60b (e.g., when the receiving portion 20 and the base substrate 50 are moved toward each other), the first tab 60a and the second tab 60b can be parallel and between the receiving portion 20 and the base substrate 50. In an embodiment, along the upright direction of the receiving portion 20 and the base substrate 50, the receiving portion 20 can be moved upward and the base substrate 50 can be moved downward such that the first main surface 21 of the receiving portion 20 and the second surface 52 (previously offset) of the base substrate 50 now face each other. In this case, the first tab 60a and the second tab 60b can be positioned parallel between the first main surface 21 of the receiving portion 20 and the second surface 52 of the base substrate 50 while being bent to surround the receiving portion 20. For example, the receiving portion 20 and the base substrate 50 can be moved closer to each other along their upright direction while being bent at the portions of the first electrode tab 15a and the second electrode tab 15b extending from the step portion T and the portions of the first connection tab 55a and the second connection tab 55b extending from the base substrate 50. As Figure 4 shown, the first tab 60a and the second tab 60b can be positioned parallel between the receiving portion 20 and the base substrate 50. In an embodiment, an adhesive member can be between the first tab 60a and the second tab 60b and the receiving portion 20 and / or between the first tab 60a and the second tab 60b and the base substrate 50, and the adhesive member can join the receiving portion 20 and the base substrate 50 to each other. In an embodiment, the adhesive member can be between the receiving portion 20 and the base substrate 50 at positions other than (e.g., where the first tab 60a and the second tab 60b are not positioned). In an embodiment, a double-sided tape can be used as the adhesive member.

[0049] In an embodiment, a tab tape 80 (see Figure 3 ) that covers and protects the joint C of the connection tab 55 extending from the base substrate 50 and the electrode tab 15 extending from the receiving portion 20 can be between the receiving portion 20 and the base substrate 50. The tab tape 80 can also be used as an adhesive member for joining the receiving portion 20 and the base substrate 50 to each other.

[0050] The base substrate 50 may include an insulating substrate and may include an insulating substrate having output terminals 40 and connection tabs 55 at or on its opposite surfaces. The output terminals 40 at the first surface 51 of the base substrate 50 and the connection tabs 55 at the second surface 52 of the base substrate 50 may be electrically connected to each other. The first output terminal and the second output terminals 41a, 41b, 42a, and 42b at the first surface 51 may be electrically connected to the first connection tab 55a and the second connection tab 55b at the second surface 52, respectively. In an embodiment, a wire pattern for electrically connecting the first output terminal and the second output terminals 41a, 41b, 42a, and 42b to the first connection tab 55a and the second connection tab 55b to each other may be in the base substrate 50.

[0051] Figure 7 is a perspective view of a battery pack according to another embodiment. Figure 8 is Figure 7 an exploded perspective view of the battery pack. Figure 9 is Figure 7 a side view of the battery pack.

[0052] Referring to Figures 7 to 9 FIG., the output terminals 140 may be on the first surface 151 of the base substrate 150, and the battery cells 10 may be on the second surface 152 of the base substrate 150. In an embodiment, the electrode tabs 15 (led out from the stepped portion T bent toward the base substrate 150) may extend from the second surface 152 of the base substrate 150 to the first surface 151 of the base substrate 150 or through the second surface 152 of the base substrate 150 to the first surface 151 of the base substrate 150, for example, through the tab holes 155 in the base substrate 150. In an embodiment, the tab holes 155 in the base substrate 150 may include a first tab hole 155a and a second tab hole 155b at positions corresponding to the first electrode tab 15a and the second electrode tab 15b, respectively.

[0053] The electrode tab 15 extending through the tab hole 155 of the base substrate 150 to the first surface 151 from the second surface 152 of the base substrate 150 can be stacked on the first surface 151 of the base substrate 150 while being bent parallel to the first surface 151 of the base substrate 150 around the tab hole 155. In an embodiment, the electrode tab 15 can be stacked on the output terminal 140 on the first surface 151 of the base substrate 150. In an embodiment, the electrode tab 15 stacked on the output terminal 140 can be joined to the output terminal 140 or adhered to the output terminal 140 through the conductive tape 92. In an embodiment, the output terminals 140 on the first surface 151 of the base substrate 150 can include a first output terminal and second output terminals 141a, 141b, 142a, and 142b electrically connected to the first electrode tab 15a and the second electrode tab 15b of the battery cell 10. In an embodiment, the output terminal 140 can include a first terminal group 141 and a second terminal group 142. The first terminal group 141 includes a pair of first output terminals 141a and second output terminals 141b of different polarities, and the second terminal group 142 includes another pair of first output terminals 142a and second output terminals 142b of different polarities. In an embodiment, the electrode tab 15 can be stacked on the first terminal group 141 and can be joined to the first terminal group 141 through the conductive tape 92.

[0054] In an embodiment, the first terminal group 141 and the second terminal group 142 can be separated from each other along the length direction (e.g., the Z direction) of the electrode tab 15 extending on the first surface 151. In this case, the electrode tab 15 can be joined to the first terminal group 141 among the first terminal group 141 and the second terminal group 142. For example, the electrode tab 15 whose length can be shortened along the length direction of the electrode tab 15 can be joined to the first terminal group 141. In an embodiment, the electrode tab 15 can be joined to the first terminal group 141 that is relatively closer to or nearer to the tab hole 155 along the length direction of the electrode tab 15. In an embodiment, the second terminal group 142 may not be directly connected to the electrode tab 15. For example, an external load or an external charger can be connected to the second terminal group 142. In an embodiment, the external load or the external charger can 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 embodiment, the conductive tape 92 attached to the first terminal group 141 (and the electrode tab 15 is located therebetween) can provide a connection point to the external load or the external charger.

[0055] The first terminal group 141 (to which the electrode tab 15 is joined or attached) may have a substantially rectangular shape that extends longitudinally (e.g., in the Z direction) along the length of the electrode tab 15 (e.g., having a major axis) to increase the contact area with the electrode tab 15. The second terminal group 142 (to which the electrode tab 15 is not joined or directly attached) may have a substantially rectangular shape that extends longitudinally (e.g., having a major axis) in a direction intersecting the length direction of the electrode tab 15 (e.g., the X direction), such that electrical connection with an external load or an external charger can be easily made, regardless of the terminal positions of the external load or the external charger.

[0056] The bonding member 91 may be between the first main surface 21 of the receiving portion 20 and the second surface 152 of the base substrate 150 to join the receiving portion 20 and the base substrate 150 to each other. In an embodiment, the bonding member 91 may include a double-sided tape.

[0057] In an embodiment, 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 shown in Figure 2 may be omitted.

[0058] The base substrate 150 may include an insulating substrate and may include an insulating substrate having the output terminal 140 on one of its surfaces. 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.

[0059] Figure 7 The remaining technical details of the battery cell 10 shown in Figures 5A to 6 are substantially the same as or similar to the technical details described with reference to

[0060] For the sake of brevity, its repeated description may be omitted. In an embodiment, the base substrate 50 or 150 (including the output terminal 40 or 140 for mediating the flow of charge / discharge current) may be applied between the battery cell 10 and a setting device on which a battery pack including the battery cell 10 is mounted, and the connection structure between the battery cell 10 and the output terminal 40 or 140 may be simplified to provide a battery pack that is conducive to miniaturization.

[0061] In an embodiment, the first electrode tab 15a and the second electrode tab 15b of the battery cell 10 may be formed of the same metal material as the metal materials of the first electrode plate 1 and the second electrode plate 2 of the electrode assembly 5, or may be formed of a metal material having a high affinity with respect to the first electrode plate 1 and the second electrode plate 2, and the first electrode tab 15a and the second electrode tab 15b of the battery cell 10 are not suitable for use as output terminals. In an embodiment, the battery pack may include output terminals having a metal material different from the metal materials of the first electrode tab 15a and the second electrode tab 15b (for example, a metal material different from the metal materials of at least one of the first electrode tab 15a and the second electrode tab 15b), and may include a base substrate 50 or 150 including output terminals 40 or 140 having a width greater than the widths of the first electrode tab 15a and the second electrode tab 15b, and an electrical connection between the output terminals 40 or 140 and the setting device can be smoothly performed. In an embodiment, the battery cell 10 can be protected from external impacts through the base substrate 50 or 150 on the battery cell 10. In an embodiment, the base substrate 50 or 150 may have a size substantially the same as the size of the battery cell 10, or may have a size slightly larger than the size of the battery cell 10, and can protect the battery cell 10 without imposing a burden on the size of the entire battery pack.

[0062] According to the disclosure, a battery pack advantageous for miniaturization can be provided by simplifying the electrical connection structure between the battery cell and the output terminal and the protection structure of the battery cell.

[0063] One or more embodiments can provide a battery pack advantageous for miniaturization by simplifying the electrical connection structure between the battery cell and the output terminal and the protection structure of the battery cell.

[0064] Example embodiments have been disclosed herein. Although specific terms are employed, the specific terms are used and interpreted in a general and descriptive sense only and not for purposes of limitation. In some instances, as will be apparent to those of ordinary skill in the art, since the filing of the present application, unless otherwise expressly stated, features, characteristics, and / or elements described in connection with a specific embodiment may be used alone or may be combined with features, characteristics, and / or elements described in connection with other embodiments. Accordingly, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A battery pack, the battery pack comprises: a substrate base including a first surface and a second surface opposite to each other, and output terminals are located on the first surface; and a battery cell located on the second surface of the substrate base, the battery cell comprising: a receiving portion in which an electrode assembly is received; and a stepped portion that seals the receiving portion and bends toward the substrate base, wherein the receiving portion includes: a front surface at which an electrode tab is led out; a rear surface opposite to the front surface; a first main surface and a second main surface that connect the front surface to the rear surface, and both the first main surface and the second main surface have the largest area among the surfaces of the receiving portion, wherein the first main surface of the receiving portion and the second surface of the substrate base are arranged parallel to each other, and wherein the electrode tab connected to the electrode assembly is led out from the stepped portion and bent onto the first main surface of the receiving portion or the first surface of the substrate base to be electrically connected to the output terminal.

2. The battery pack according to claim 1, wherein, the receiving portion further includes: a pair of side surfaces that connect the front surface to the rear surface, and both of the pair of side surfaces have an area smaller than the area of each of the first main surface and the second main surface.

3. The battery pack according to claim 2, wherein, both the first main surface and the second main surface have an area larger than the area of each of the front surface, the rear surface, and the pair of side surfaces of the receiving portion.

4. The battery pack according to claim 2, wherein, the first main surface corresponds to the main surface that is away from the stepped portion along the direction in which the first main surface and the second main surface face each other.

5. The battery pack according to claim 1, the battery pack further includes an adhesive member located between the first main surface of the receiving portion and the second surface of the substrate base.

6. The battery pack according to claim 5, wherein, the adhesive member includes a double-sided tape.

7. The battery pack according to claim 1, wherein: the battery cell includes a sealing portion formed along the edge of the receiving portion to seal the receiving portion, and the sealing portion includes a stepped portion extending from the receiving portion in the forward direction of the receiving portion and a side sealing portion extending from the receiving portion in the lateral direction of the receiving portion.

8. The battery pack according to claim 7, wherein, the stepped portion and the side sealing portion are separated from each other and a gap is located between the stepped portion and the side sealing portion, and they are folded upward toward the front surface and the side surface of the receiving portion respectively.

9. The battery pack according to claim 1, wherein, the electrode tab includes a first electrode tab and a second electrode tab of different polarities.

10. The battery pack according to claim 9, wherein, the output terminal includes: a first terminal group including a pair of first output terminals and second output terminals of different polarities; and a second terminal group including a pair of first output terminals and second output terminals of different polarities.

11. The battery pack according to claim 10, wherein: the first output terminal and the second output terminal forming the first terminal group are separated from each other along the same direction as the direction in which the first electrode tab and the second electrode tab of the battery cell are separated, and The first output terminal and the second output terminal forming the second terminal group are separated from each other in the same direction as the direction in which the first electrode tab and the second electrode tab of the battery cell are separated.

12. The battery pack according to claim 10, wherein, the first terminal group and the second terminal group are separated from each other in a direction intersecting the direction in which the first electrode tab and the second electrode tab are separated.

13. The battery pack according to claim 1, further comprising a connection tab located on a second surface of the base substrate, the connection tab protruding from the second surface and electrically connected to the electrode tab.

14. The battery pack according to claim 13, wherein: the electrode tab includes a first electrode tab and a second electrode tab of different polarities, the connection tab includes a first connection tab and a second connection tab respectively connected to the first electrode tab and the second electrode tab, and the first tab including the first electrode tab and the first connection tab connected to each other and the second tab including the second electrode tab and the second connection tab connected to each other are both located between the first main surface of the accommodation part and the second surface of the base substrate.

15. The battery pack according to claim 14, further comprising tab bands around the joint of the first electrode tab and the first connection tab and around the joint of the second electrode tab and the second connection tab.

16. The battery pack according to claim 14, wherein, the first tab and the second tab are located between the first main surface of the accommodation part and the second surface of the base substrate, and the first tab and the second tab are bent from the stepped part toward the base substrate and are bent to surround the accommodation part.

17. The battery pack according to claim 1, further comprising a tab hole penetrating the first surface and the second surface of the base substrate in the base substrate, wherein, the electrode tab extends from the stepped part through the tab hole toward the base substrate on one side of the second surface of the base substrate to the first surface of the base substrate.

18. The battery pack according to claim 17, wherein, the electrode tab is bent around the tab hole to be parallel to the first surface of the base substrate to overlap with the first surface.

19. The battery pack according to claim 18, wherein, the electrode tab overlaps with the output terminal located on the first surface of the base substrate and is combined with the output terminal.

20. The battery pack according to claim 19, further comprising a conductive band attached to the electrode tab overlapping with the output terminal.

21. The battery pack according to claim 19, wherein: the output terminal includes: a first terminal group including a pair of first output terminals and second output terminals of different polarities; and a second terminal group including a pair of first output terminals and second output terminals of different polarities, the first terminal group and the second terminal group are separated from each other in the length direction of the electrode tab extending on the first surface, and the electrode tab is combined with the first terminal group among the first terminal group and the second terminal group that is close to the tab hole in the length direction of the electrode tab.

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