WO2019078450A1

WO2019078450A1 - Battery pack

Info

Publication number: WO2019078450A1
Application number: PCT/KR2018/007660
Authority: WO
Inventors: 박상훈
Original assignee: 삼성에스디아이(주)
Priority date: 2017-10-19
Filing date: 2018-07-05
Publication date: 2019-04-25
Also published as: KR20190043796A; KR102422515B1

Abstract

Various embodiments of the present invention relate to a battery pack. A technical objective to be achieved is to provide a battery pack which has battery cells stacked in two layers and a protection circuit module positioned in a vertical direction between the stacked battery cells and thus has increased ratio of total pack area to cell area and enables increased energy density. To this end, disclosed is a battery pack comprising: a first battery cell comprising a first terrace which extends from a first front surface and a first cell tab which extends from the first terrace; a second battery cell comprising a second terrace which extends from a second front surface and a second cell tab which extends from the second terrace, and stacked on the first battery cell; and a protection circuit module which is positioned upright in a vertical direction between the first terrace of the first battery cell and the second terrace of the second battery cell, is electrically connected to the first battery cell by means of the first cell tab, and is electrically connected to the second battery cell by means of the second cell tab.

Description

Battery pack

Various embodiments of the present invention relate to a battery pack.

Generally, a rechargeable secondary battery that is charged and used is used as a power source for a mobile device, a hybrid vehicle, or an electric vehicle. The secondary battery includes an electrode assembly and a case for accommodating the electrode assembly. In this case, depending on the type of case used, the secondary battery can be classified into a square type, a cylindrical type, or a pouch type secondary battery, and the electrode assembly housed therein can be classified into a winding type or stack type electrode assembly .

The above-described information disclosed in the background of the present invention is only for improving the understanding of the background of the present invention, and thus may include information not constituting the prior art.

The various embodiments of the present invention can increase the energy density by increasing the ratio of the cell area to the total pack area by locating the protection circuit module vertically between the stacked battery cells and stacking the battery cells in two stages Provide a battery pack.

The various embodiments of the present invention include a module cover that covers the protection circuit module so that the laser beam is not incident on the battery cell when laser welding the cell tap of the battery cell to the conductive pad of the protection circuit module, And a battery pack.

Various embodiments of the present invention provide a battery pack capable of suppressing damages of a battery cell caused by a module cover by being closely attached to a battery cell through an elastic member without directly contacting the module cover, which is a plastic molded article, directly to the battery cell.

A battery pack according to various embodiments of the present invention includes a first battery cell including a first terrace extending from a first front surface and a first cell tap extending from the first terrace; A second battery cell stacked on the first battery cell, the second cell cell including a second terrace extending from a second front surface and a second cell tap extending from the second terrace; And a first terrace of the first battery cell and the second battery cell are positioned in a vertical direction between the second terrace and electrically connected to the first battery cell through the first cell tap, And a protection circuit module electrically connected to the battery cell through the second cell tap.

The first and second battery cells may each include a pouch type or a polymer type.

The first terrace has a lower surface and an upper surface, and the lower surface of the first terrace forms the same surface as the lower surface of the first battery cell, and the upper surface of the first terrace is positioned between the lower surface and the upper surface of the first battery cell Wherein the first cell tab protrudes from a first front end face between the lower surface and the upper surface of the first terrace, the second terrace has an upper surface and a lower surface, and an upper surface of the second terrace And the second cell tab is protruded from a second front end surface between the upper surface and the lower surface of the second terrace, do.

And a module cover interposed between the protection circuit module and the first and second front surfaces of the first and second battery cells. Wherein the module cover covers a rear surface of the protection circuit module and has a first plane that contacts the first and second cell tabs, a second plane that contacts the first and second front end surfaces of the first and second terraces, A third plane that contacts the upper and lower surfaces of the first and second terraces, respectively, and a fourth plane that is parallel to the first and second front surfaces of the first and second battery cells. The module cover may further include an elastic member interposed between the first and second front surfaces of the first and second battery cells.

The first and second cell tabs may be electrically connected to first and second pads provided on a front surface of the protection circuit module, respectively.

And a front case covering the front surface of the protection circuit module and the first and second cell tabs.

In the battery pack according to various embodiments of the present invention, the first and second battery cells are stacked in two stages, and the protection circuit module is vertically disposed between the stacked first and second battery cells, The ratio of the area is increased, so that the energy density can be increased.

In the battery pack according to various embodiments of the present invention, when the first and second tabs of the first and second battery cells are laser-welded to the first and second pads of the protection circuit module, the laser beam enters the first and second battery cells It is possible to prevent the defective manufacturing process by providing the module cover for covering the protection circuit module.

The battery pack according to various embodiments of the present invention is a battery pack in which the module cover, which is a plastic molded article, is tightly attached to the first and second battery cells through the elastic member without directly contacting the first and second battery cells, So that the damage of the battery cell can be suppressed.

1A and 1B are a perspective view and an exploded perspective view showing a battery pack according to various embodiments of the present invention.

2 is an exploded perspective view illustrating an example of a battery cell among battery packs according to various embodiments of the present invention.

3A and 3B are a side view and a partial side sectional view showing a state in which a label is removed from a battery pack and a front case is removed, according to various embodiments of the present invention.

4 is a partial cross-sectional view illustrating a battery pack according to various embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more faithful and complete, and will fully convey the scope of the invention to those skilled in the art.

In the following drawings, thickness and size of each layer are exaggerated for convenience and clarity of description, and the same reference numerals denote the same elements in the drawings. As used herein, the term " and / or " includes any and all combinations of one or more of the listed items. In the present specification, the term " connected " means not only the case where the A member and the B member are directly connected but also the case where the C member is interposed between the A member and the B member and the A member and the B member are indirectly connected do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise, " and / or " comprising, " when used in this specification, are intended to be interchangeable with the said forms, numbers, steps, operations, elements, elements and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

It is to be understood that the terms related to space such as "beneath," "below," "lower," "above, But may be utilized for an easy understanding of other elements or features. Terms related to such a space are for easy understanding of the present invention depending on various process states or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature of the drawing is inverted, the element or feature described as "lower" or "below" will be "upper" or "above." Thus, " lower " is a concept encompassing " upper " or " lower ".

Referring to FIGS. 1A and 1B, there is shown a perspective view and an exploded perspective view of a battery pack 100 according to various embodiments of the present invention.

1A and 1B, a battery pack 100 according to an embodiment of the present invention includes a first battery cell 100A and a second battery cell 100B stacked vertically (upper) on the first battery cell 100A. The protection circuit module 130 is vertically disposed between the first and

second battery cells

100A and 100B and is electrically connected to the first and

second battery cells

100A and 100B. .

The battery pack 100 according to the embodiment of the present invention includes a module cover 140, an elastic member 150, a front case 160, a rear case 170, a lower label 181, And may further include an upper label 182.

The first battery cell 100A may include, for example, but is not limited to, a pouch-type or polymer-type battery. A plurality of such first battery cells 100A may be arranged in the horizontal direction. In FIG. 1B, three of the first battery cells 100A are arranged in the horizontal direction.

The first battery cell 100A includes a first terrace 125A extending from the first front surface 121A and a second front cell 125B extending forward from the first front end surface 126A of the first terrace 125A, (E.g., a positive cell tab and a negative cell tab).

Here, when the first front surface 121A and the first front surface 126A are defined as vertical surfaces, the upper surface and the lower surface of the first terrace 125A may be defined as horizontal surfaces.

In addition, the first terrace 125A extends a predetermined length from the lower portion of the first front surface 121A of the first battery cell 100A toward the front. The configuration of the first battery cell 100A will be described below again.

The second battery cell 100B may include, for example, but not limited to, a pouch type or polymer type battery. A plurality of such second battery cells 100B may be arranged in the horizontal direction. In FIG. 1B, three second battery cells 100B are arranged in the horizontal direction.

The second battery cell 100B has a second terrace 125B extending from the second front surface 121B (see Figs. 3A and 3B) and a second front terrace 125B extending forward from the second front end surface 126B of the second terrace 125B And a second cell tab 114B (e.g., an anode cell tab and a cathode cell tab) that is extended and then bent downward.

Here, if the second front surface 121B and the second front surface 126B are defined as vertical surfaces, the upper and lower surfaces of the second terrace 125B may be defined as horizontal surfaces.

In addition, the second terrace 125B extends a certain length forward from a relatively upper region of the second front surface 121B of the second battery cell 100B.

The protection circuit module 130 is vertically positioned between the first terrace 125A of the first battery cell 100A and the second terrace 125B of the second battery cell 100B. The protection circuit module 130 includes a first pad 131 and a second pad 132 formed on the front surface and an electrical and electronic component 133 (see FIG. 3B) mounted on the rear surface. In addition, the protection circuit module 130 may further include a connector 134 mounted on the front surface.

The first cell tab 114A of the first battery cell 100A is electrically connected to the first pad 131 of the protection circuit module 130 and the second cell pad 114A of the second battery cell 100A is electrically connected to the second pad 132 of the protection circuit module 130, And the second cell tap 114B of the battery cell 100B is electrically connected.

The protection circuit module 130 protects the first and

second battery cells

100A and 100B from being overcharged, overdischarged, and / or overcurrent. To this end, a plurality of electrical and electronic components 133 are mounted on the rear surface .

As described above, the battery pack 100 according to various embodiments of the present invention includes the first and

second battery cells

100A and 100B stacked vertically in two stages, the first and

second battery cells

100A and 100B, The protection circuit module 130 is positioned vertically between the first and

second terraces

125A and 125B so that the ratio of the cell area to the total pack area can be increased to increase the energy density.

Subsequently, the module cover 140 covers the rear surface of the protection circuit module 130. Particularly, the module cover 140 is interposed between the protection circuit module 130 and the first and second

front surfaces

121A and 121B of the first and

second battery cells

100A and 100B. The first and

second cell tabs

114A and 114B of the first and

second battery cells

100A and 100B are electrically connected to the first and

second pads

131 and 132 of the protection circuit module 130 by the module cover 140, When the laser beam is welded, the laser beam is not incident on the first and second front faces 121A and 121B of the first and

second battery cells

100A and 100B. If the module cover 140 is not provided, the laser beam is incident on the first and second front faces 121A and 121B of the first and

second battery cells

100A and 100B during laser welding, , And 100B. The module cover 140 may be formed by injection molding a conventional plastic resin.

The elastic member 150 may further be interposed between the module cover 140 and the first and second

front surfaces

121A and 121B of the first and

second battery cells

100A and 100B. The elastic member 150 may include, for example, but not limited to, a poron foam, a poron tape, a poron sheet, a poron film, or a poron sponge coated with an adhesive or a pressure-sensitive adhesive on one or both sides . The elastic member 150 is disposed in such a manner that the module cover 140, which is a plastic resin molding, contacts the first and second

front surfaces

121A and 121B of the first and

second battery cells

100A and 100B, (121A, 121B) is prevented from being damaged.

The front case 160 covers the front surface of the protection circuit module 130 and the first and

second cell tabs

114A and 114B of the first and

second battery cells

100A and 100B to protect them from the external environment. The front case 160 may further include an opening 161 formed to allow the connector 134 to protrude forward. The front case 160 may also be formed by injection molding of a plastic resin.

The rear case 170 covers the rear of the first and

second battery cells

100A and 100B so that the rear area of the battery pack 100 is protected from the external mechanical / electrical / chemical environment.

The lower label 181 covers the lower surface of the first battery cell 100A and the upper label 182 covers the upper surface of the second battery cell 100B so that the lower and upper surfaces of the battery pack 100 are mechanically / Protected from electrical / chemical environments.

Referring to FIG. 2, an exploded perspective view of an example of a battery cell 100A among battery packs according to various embodiments of the present invention is shown.

2, among battery packs according to various embodiments of the present invention, a battery cell 100A includes an electrode assembly 110 and a pouch 120. As shown in FIG.

The electrode assembly 110 may include a first electrode 111, a second electrode 112 and a separator 113 interposed between the first electrode 111 and the second electrode 112. The electrode assembly 110 may be formed by winding a laminate of the first electrode 111, the separator 113, and the second electrode 112. Although the electrode assembly 110 is shown in the drawing, for example, a wound or jelly roll type electrode assembly, a stacked electrode assembly may also be used in another embodiment of the present invention.

The first electrode 111 may act as an anode and the second electrode 112 may act as a cathode. Of course, conversely, the following description will be made on the assumption that the first electrode 111 acts as an anode and the second electrode 112 acts as a cathode.

The first electrode 111 includes a first electrode active material layer coated on both surfaces of a first electrode current collector made of a metal thin plate having excellent conductivity, for example, an aluminum foil or a mesh. The first electrode active material may include, but is not limited to, a chalcogenide compound. For example, composite metal oxides such as LiCoO2, LiMn2O4, LiNiO2, and LiNiMnO2 may be used. The first electrode uncoated portion in which the first electrode active material layer is not formed on the first electrode current collector may be formed with a cell tap 114A (first electrode tab) 114, though it is not limited thereto. That is, one end of the first electrode tab 114 is electrically connected to the first electrode non-coated portion, and the tab may protrude to the outside. The first electrode tab 114 may be provided with an insulating member 114a to prevent the first electrode tab 114 from being short-circuited with the pouch 120.

The second electrode 112 includes, but is not limited to, a second electrode active material layer coated on both sides of a second electrode current collector made of a conductive metal foil, for example, copper or nickel foil or mesh. The second electrode active material may include, but is not limited to, a carbon-based material, Si, Sn, a tin oxide, a tin alloy composite, a transition metal oxide, a lithium metal nitride or a metal oxide. (Second electrode tab) 115 may be formed on the second electrode non-coated portion where the second electrode active material layer is not formed on the second electrode current collector. That is, one end of the second electrode tab 115 may be electrically connected to the second electrode non-conductive portion and the other end may protrude to the outside. The second electrode tab 115 may be provided with an insulating member 115a to prevent the second electrode tab 115 from being short-circuited with the pouch 120.

The separator 113 is interposed between the first electrode 111 and the second electrode 112 to prevent a short circuit between the first electrode 111 and the second electrode 112. The separator 113 may be made of any one selected from the group consisting of polyethylene, polypropylene, and a porous copolymer of polyethylene and polypropylene, though not limited thereto. The separator 113 may have a width greater than that of the first electrode 111 and the second electrode 112 to prevent a short circuit between the first electrode 111 and the second electrode 112. In addition, the separator is a concept including, but not limited to, a solid electrolyte (e.g., an inorganic ceramic-based electrolyte such as Perovskite, NASICON, LISICON, Sulfide, Garnet or Glass, or a polymer based electrolyte) , In which case the liquid electrolyte may be omitted.

The pouch, the pouch exterior member or the laminate exterior member 120 is formed by housing the electrode assembly 110 and sealing the outer periphery of the electrode assembly 110. The pouch 120 includes a first enclosure 121 having a recess 123 having a predetermined depth to accommodate the electrode assembly 110 and a second enclosure 121 having one end connected to the first enclosure 121, And a second exterior portion 122 covering the first exterior portion 110.

In addition, the pouch 120 includes a pair of longitudinal sealing portions 124 formed by heat-sealing the peripheries of the first and second covering

portions

121 and 122 corresponding to the outer periphery of the electrode assembly 110, (Not shown). That is, the pair of longitudinal sealing portions 124 are formed by sealing the peripheries of the first and second

external portions

121 and 122 in a direction substantially parallel to the longitudinal direction of the electrode assembly 110, (125) are formed by sealing the peripheries of the first and second external parts (121, 122) in a direction substantially parallel to the width direction of the electrode assembly (110). Here, the longitudinal sealing portion 124 and the widthwise sealing portion 125 have a substantially vertical relationship with each other. That is, the pair of longitudinal sealing portions 124 and one widthwise sealing portion 125 are approximately "∩" shaped.

The electrode assembly 110 is securely protected inside the pouch 120 by the longitudinal sealing portion 124 and the widthwise sealing portion 125 of the pouch 120 and the electrolytic solution is not leaked.

The first and

second electrode tabs

114 and 115 of the electrode assembly 110 are drawn out to the outside through the widthwise sealing portion 125 in which the first and second

external portions

121 and 122 are sealed. At this time, the insulating members 114a and 115b formed on the first and

second electrode tabs

114 and 115 are sealed together with the width directional sealing part 125. That is, the insulating members 114a and 115b are formed at portions where the first and

second electrode tabs

114 and 115 and the width directional sealing portion 125 are in contact with each other so that the first and

second electrode tabs

114 and 115 are connected to the pouch 120, .

The first and

second enclosures

121 and 122 further include a terrace 125A formed in a region corresponding to the widthwise sealing portion 125. [ That is, the surface of the widthwise sealing portion 125 from which the first and

second electrode tabs

114 and 115 are drawn may be defined as a terrace portion 125A. In addition, the area of the first enclosure 121 where the terrace portion 125A begins to extend can be defined as the front surface 121A. The terrace portion 125A is generally bent in the vertical direction from the front surface 121A. This is because the front face 121A is an area formed by the recess 124. [

The pouch 120 may be formed in a multi-layer structure including, but not limited to, a first insulating layer 120a, a metal layer 120b, and a second insulating layer 120c. Of course, a variety of adhesive layers and functional layers may be further added, but a description thereof will be omitted so as not to obscure the gist of the present invention.

The first insulating layer 120a is an inner surface of the pouch 120, and is formed of a material having insulating and thermal adhesiveness. The first insulating layer 120a is formed on one surface of the metal layer 120b and forms an inner surface of the pouch 120 facing the electrode assembly 110. [ The first insulating layer 120a may be formed of casted polypropylene (CPP) or its equivalent which does not react with an electrolyte or the like, but is not limited thereto. When the electrode assembly 110 is received in the recess 123 of the first enclosure 121 and is covered with the second enclosure 122, the first insulation layer 120a of the pouch 120 is brought into contact with each other. Therefore, when the sealing

portions

124 and 125 are thermally fused, the first insulating layer 120a is adhered to each other and the pouch 120 is sealed.

The metal layer 120b is interposed between the first insulating layer 120a and the second insulating layer 120c to prevent moisture and oxygen from being introduced into the pouch 120. If the electrolyte is filled in the pouch 120, And serves to prevent external leakage thereof. In addition, the metal layer 120b serves to maintain the mechanical strength of the pouch 120. In general, the metal layer 120b may be formed of, but not limited to, aluminum, an aluminum alloy, an iron, and an iron alloy. This metal layer 120b is stretched during the process of forming the recess 123, and in particular, the thickness of a portion where a lot of stretching is made is thinned and cracked, so that moisture resistance can be deteriorated (that is, moisture permeability can be increased). Therefore, it is very important to control the thickness of the extended metal layer 120b during the molding process of the recess 123. [

The second insulating layer 120c serves as an outer surface of the pouch 120 to mitigate mechanical and chemical impacts with external electronic devices. The second insulating layer 120c is formed on the other surface of the metal layer 120b and forms the outer surface of the pouch 120. The second insulating layer 120c may be formed of, but not limited to, nylon, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), or the like.

3A and 3B, a side view and a partial side sectional view of the battery pack 100 according to various embodiments of the present invention, in which the

labels

181 and 182 are removed, and the front case 160 is removed, are shown. 4, a partial cross-sectional view of a battery pack 100 according to various embodiments of the present invention is shown. In FIG. 4, the first battery cell 100A positioned underneath for understanding of the present invention is not shown.

3A, 3B and 4, the protection circuit module 130 is configured such that the first terrace 125A and the second battery cell 100B of the first battery cell 100A are connected to the second terrace 125B, In the vertical direction. The first cell taps 114A of the first battery cell 100A are electrically connected to the protection circuit module 130 and the second cell taps 114B of the second battery cell 100B are electrically connected.

This will be explained in more detail.

The first terrace 125A of the first battery cell 100A includes a substantially flat lower surface 125AB and a substantially flat upper surface 125AT as the opposite surface thereof and the lower surface 125AB of the first terrace 125A is substantially And the upper surface 125AT of the first terrace 125A is positioned between the lower surface 100AB and the upper surface 100AT of the first battery cell 100A. That is, the upper surface 124AT of the first terrace 125A is positioned lower than the upper surface 100AT of the first battery cell 100A. In addition, the first cell-tab 114A protrudes and extends forward from the first front end surface 126A between the lower surface 125AB of the first terrace 125A and the upper surface 125AT, That is, on the first pad 131. The first cell tap 114A is connected to the first pad 131 provided on the front surface of the protection circuit module 130 by laser, ultrasonic or resistance welding. In addition, the first terrace 125A generally extends forward from the lower region of the first front surface 121A provided in the first battery cell 100A, When the front face 121A and the first front end face 126A of the first terrace 125A are defined as vertical faces, the lower face 125AB and the upper face 125AT of the first terrace 125A can be defined as horizontal faces.

The second terrace 125B of the second battery cell 100B includes a substantially flat upper surface 125BT and a substantially flat lower surface 125BB opposite thereto and an upper surface 125BT of the second terrace 125B is substantially The lower surface 125BB of the second terrace 125B is positioned between the upper surface 100BT of the second battery cell 100B and the lower surface 125BB of the second battery cell 100B. That is, the lower surface 125BB of the second terrace 125B is positioned higher than the lower surface 100BB of the second battery cell 100B. The second cell tab 114B protrudes and extends forward from the second front end surface 126B between the upper surface 125BT and the lower surface 125BB of the second terrace 125B, That is, on the second pad 132. The second cell tap 114B is connected to the second pad 132 provided on the front surface of the protection circuit module 130 by laser, ultrasonic or resistance welding. In addition, the second terrace 125B generally extends forward from the upper area of the second front surface 121B of the second battery cell 100B, The upper surface 125BT and the lower surface 125BB of the second terrace 125B may be defined as a horizontal surface when the front surface 121B and the second front surface 126B of the second terrace 125B are defined as vertical surfaces.

The top surface 100AT of the first battery cell 100A and the bottom surface 100BB of the second battery are in close contact with each other and the top surface 125AT of the first terrace 125A and the top surface 125B of the second terrace 125B And the lower surface 125BB of the lower surface 125B are opposed to each other. That is, the protective circuit module 130, the module cover 140, and / or the elastic member 150 are provided in the area between the upper surface 125AT of the first terrace 125A and the lower surface 125BB of the second terrace 125B A predetermined space is provided so as to be positioned.

The module cover 140 is interposed between the protection circuit module 130 and the first and second

front surfaces

121A and 121B of the first and

second battery cells

100A and 100B to protect the rear surface of the protection circuit module 130 The mounting surface of the electronic component 133). The module cover 140 may be formed by injection molding of a plastic resin, and it may be formed of a first plane (first plane) The second plane 142 contacting the first and second front end surfaces of the first and

second terraces

125A and 125B and the top and bottom surfaces of the first and

second terraces

125A and 125B And a fourth plane 144 that is generally parallel to the third plane 143 and the first and second front faces 121A and 121B of the first and

second battery cells

100A and 100B. The first plane 141 of the module cover 140 is positioned between the first and second cell taps 114A and 114B and the third and fourth planes of the module cover 140 are positioned between the first and

second battery cells

100A, 100B of the first and

second terraces

125A, 125B. Therefore, the first and

second terraces

125A and 125B are provided with a predetermined space between the first and

second battery cells

100A and 100B, and the first and

second terraces

125A and 125B are not bent do.

The protective circuit module 130 is mounted on the front space of the module cover 140 where the first plane 141, the second plane 142, the third plane 143 and the fourth plane 144 are opposite to each other. And is stably positioned.

In addition, when the first and

second cell tabs

114A and 114B are laser-welded to the first and

second pads

131 and 132 of the protection circuit module 130, The laser beams are not incident on the first and second front faces 121A and 121B of the

light emitting devices

100A and 100B, thereby preventing a failure phenomenon (damage of the battery cell) caused by the laser beam during the manufacturing process.

The elastic member 150 is interposed between the module cover 140 and the first and second front faces 121A and 121B of the first and

second battery cells

100A and 100B. The elastic members 150 may be attached to the rear surface of the module cover 140 or may be attached to the first and second

front surfaces

121A and 121B of the first and

second battery cells

100A and 100B, Can be adhered. Of course, the elastic member 150 may be bonded to both the rear surface of the module cover 140 and the first and second

front surfaces

121A and 121B of the first and

second battery cells

100A and 100B.

second cell tabs

114A and 114B of the first and

second battery cells

100A and 100B to securely protect them from the external environment. At this time, the connector 134 provided in the protection circuit module 130 is exposed / protruded to the outside through the opening 161 formed in the front case 160, so that the battery pack 100 can be electrically connected to the load or the charger have.

As described above, the battery pack 100 according to various embodiments of the present invention is configured such that the first and

second battery cells

100A and 100B are stacked in two stages, and the first and

second battery cells

100A and 100B are stacked. The ratio of the cell area to the total pack area is increased so that the energy density can be increased.

The battery pack 100 according to various embodiments of the present invention may be configured such that the first and

second cell tabs

114A and 114B of the first and

second battery cells

100A and 100B are connected to the first and second pads The module cover 140 covering the protection circuit module 130 is provided to prevent the laser beam from being incident on the first and

second battery cells

100A and 100B when laser welding is performed to the first and

second battery cells

100 and 100. Therefore, .

The battery pack 100 according to various embodiments of the present invention may be constructed such that the module cover 140 which is a plastic molded article is not directly adhered to the first and

second battery cells

100A and 100B, The first and

second battery cells

100A and 100B are prevented from being damaged by the module cover 140 by being in close contact with the

battery cells

100A and 100B.

It is to be understood that the present invention is not limited to the above-described embodiment, but may be modified in various ways within the scope of the present invention as set forth in the following claims It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

A first battery cell comprising a first terrace extending from a first front side and a first cell tap extending from the first terrace;

A second battery cell stacked on the first battery cell, the second cell cell including a second terrace extending from a second front surface and a second cell tap extending from the second terrace; And

Wherein the first cell of the first battery cell and the second battery cell are located in a vertical direction between the second terrace and are electrically connected to the first battery cell through the first cell tap, And a protection circuit module electrically connected to the cell through the second cell tap.
The method according to claim 1,

Wherein the first and second battery cells each include a pouch type or a polymer type.
The method according to claim 1,

The first terrace has a lower surface and an upper surface, and the lower surface of the first terrace forms the same surface as the lower surface of the first battery cell, and the upper surface of the first terrace is positioned between the lower surface and the upper surface of the first battery cell , The first cell tab protrudes from a first front end face between the lower face and the upper face of the first terrace,

Wherein the second terrace has an upper surface and a lower surface and the upper surface of the second terrace is flush with the upper surface of the second battery cell and the lower surface of the second terrace is located between the upper surface and the lower surface of the second battery cell And the second cell tab protrudes from the second front end surface between the upper surface and the lower surface of the second terrace.
The method according to claim 1,

And a module cover interposed between the protection circuit module and the first and second front faces of the first and second battery cells.
5. The method of claim 4,

Wherein the module cover covers a rear surface of the protection circuit module and has a first plane that contacts the first and second cell tabs, a second plane that contacts the first and second front end surfaces of the first and second terraces, A third plane contacting the upper and lower surfaces of the first and second terraces, respectively, and a fourth plane parallel to the first and second front surfaces of the first and second battery cells.
5. The method of claim 4,

Further comprising an elastic member interposed between the module cover and the first and second front surfaces of the first and second battery cells.
The method according to claim 1,

Wherein the first and second cell tabs are electrically connected to first and second pads provided on a front surface of the protection circuit module, respectively.
The method according to claim 1,

And a front case covering the front surface of the protection circuit module and the first and second tabs.