Patent Description:
In general, a lithium secondary battery may be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can, and a pouch type secondary battery in which the electrode assembly is embedded in a pouch case, which is an aluminum laminate sheet, depending on a shape of a case.

The lithium secondary battery is widely used not only for small mobile devices but also for medium and large devices such as automobiles and power storage devices. In this case, a plurality of pouch type secondary batteries, which are easy to stack and light in weight, are connected and used to increase capacity and output.

However, in the case in which a battery module is configured by stacking the plurality of pouch type secondary batteries, since heat generated from the plurality of secondary batteries is added up to quickly raise a temperature of the battery module, it is very important to ensure stable and effective cooling performance when the battery module is configured by using the plurality of pouch type secondary batteries.

Therefore, as a cooling method having a simple structure while ensuring efficient cooling performance, a method of performing cooling by making a side surface portion of the pouch type secondary battery to be in direct contact with a surface of a cooling plate has recently been studied, but it is difficult to make the side surface portion of the pouch type secondary battery be effectively in close contact with the cooling plate due to a limitation of a shape of the pouch case.

In order to solve the above-mentioned problem, in <CIT> entitled "pouch-type battery", a pair of receiving parts are formed in a pouch case as one space while not being divided into independent spaces, but when the secondary battery is manufactured with the pouch case of such a shape, a problem occurs in which the pouch case is not folded or both ends of the side surface portion are dented outwardly during a process of folding the pouch case. Also, <CIT>, entitled "Pouch Cladding for Secondary Battery" discloses a pouch casing material including two cups forming an electrode assembly receiving portion and formed integrally in one pouch film,<CIT>, entitled "Layered-Type Secondary Battery with Parallel Connection Structure" discloses a pouch casing for battery cell with two receiving compartments and intermediate joining portion of lower height in between, <CIT>, entitled "Secondary Battery Pouch Exterior Material, Pouch Type Secondary Battery Using Same, and Manufacturing Method Thereof" discloses a battery pack comprising a plurality of pouch cells aligned in a cooling plate by protruding segment of the pouch casing, and <CIT>, entitled "Highly reliable and durable battery and process for fabrication thereof" discloses a battery with concave element on a pouching case. But all the prior arts did not suggest any effective way to make side surface portion of the pouch type secondary battery be effectively in close contact with the cooling plate.

An embodiment of the present invention is directed to providing a pouch case in which one side surface of the secondary battery is in close contact with a cooling plate to maximize cooling efficiency by allowing one side surface of the secondary battery using the pouch case to have a perfect cooling structure, and the secondary battery using the same.

In one general aspect, a pouch case for receiving and packaging an electrode assembly, includes: a first receiving part and a second receiving part which are concavely formed; a sealing part formed along an outer portion of the pouch case so as to surround the first receiving part and the second receiving part; and a partitioning part formed between the first receiving part and the second receiving part and protruding from a bottom surface of each receiving part to partition the first receiving part and the second receiving part, wherein the partitioning part includes: a first partitioning part having an upper end having a height lower than that of the sealing part and partitioning the first receiving part and the second receiving part at a middle of the partitioning part; a second partitioning part having an upper surface having the same height as that of the sealing part at both ends of the partitioning part; and a third partitioning part connecting the first partitioning part and the second partitioning part to each other.

The third partitioning part may be inclined toward the second partitioning part at an end portion of the first partitioning part in a length direction.

The third partitioning part may be connected to upper end portions of the second partitioning part and the first partitioning part in a round form.

The first partitioning part may include a curved part having an upper end portion formed in a curved cross section.

The first partitioning part may further include a plane part connecting the first receiving part and the second receiving part with the curved part in a linear form.

A length of a cross section of an upper side surface of the first partitioning part may be smaller than a sum of a depth of the first receiving part and a depth of the second receiving part.

In another general aspect, a secondary battery includes a pouch case and an electrode assembly, wherein the pouch case includes: a first receiving part and a second receiving part which are concavely formed; a sealing part formed along an outer portion of the pouch case so as to surround the first receiving part and the second receiving part; and a partitioning part formed between the first receiving part and the second receiving part and protruding from a bottom surface of each receiving part to partition the first receiving part and the second receiving part, wherein the partitioning part includes: a first partitioning part having an upper end having a height lower than that of the sealing part and partitioning the first receiving part and the second receiving part at a middle of the partitioning part; a second partitioning part having an upper surface having the same height as that of the sealing part at both ends of the partitioning part; and a third partitioning part connecting the first partitioning part and the second partitioning part to each other, and the electrode assembly is received and packaged in a receiving space formed by folding the partitioning part so that the first receiving part and the second receiving part of the pouch case face each other.

The first partitioning part may be unfolded and may be formed as a side surface part of a plane form, and the sealing part may include extending parts protruding in a direction perpendicular to the side surface part of the secondary battery at portions adjacent to both ends of the side surface part of the secondary battery.

A sum of a depth of the first receiving part and a depth of the second receiving part of the pouch case may be equal to a thickness of the electrode assembly.

The first partitioning part may be unfolded and may be formed as a side surface part of a plane form, and dimples of a concave form may be formed at both ends of the side surface part.

In another general aspect, a secondary battery pack includes: one or more secondary batteries; and a cooling plate including a surface which is in surface contact with side surface parts of the secondary batteries.

The sealing part may include extending parts protruding in a direction perpendicular to the side surface parts of the secondary batteries at portions adjacent to both ends of the side surface parts of the secondary batteries.

A width between a first side surface and a second side surface of the cooling plate may correspond to a length between the extending parts of the secondary batteries.

A width between a first side surface and a second side surface of the cooling plate may be greater than a length between the extending parts of the secondary batteries.

Each of the first side surface and the second side surface of the cooling plate may be formed with a step at a height which is greater than or equal to a length of the extending parts of the secondary batteries.

Each of the first side surface and the second side surface of the cooling plate may be formed with one or more grooves at a depth which is greater than or equal to a length of the extending parts so as to receive the extending parts of the secondary batteries.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following detailed description is merely exemplary and is merely illustrative of embodiments of the present invention.

<FIG> is an exploded perspective view illustrating a secondary battery including an electrode assembly and a pouch case according to an embodiment of the present invention.

Referring to <FIG>, a secondary battery <NUM> according to the present invention may include a pouch case <NUM> and an electrode assembly <NUM> including a plurality of electrode bodies stacked with a separator interposed therebetween. Here, the pouch case <NUM> is sealed and packaged with a sealing part <NUM> which receives and surrounds the electrode assembly <NUM> and is in contact with the electrode assembly <NUM>.

A first electrode tab <NUM> and a second electrode tab <NUM> may be formed on both ends of the electrode assembly <NUM>, and in <FIG>, although the electrode tabs are formed in the form that protrudes from both side surfaces of the electrode assembly <NUM> in a horizontal direction, the secondary battery <NUM> according to the present invention does not limit a configuration of the electrode tabs thereto, and the first electrode tab <NUM> and the second electrode tab <NUM> may also be simultaneously disposed on any one side surface of the sealing part <NUM>.

<FIG> is an upper plan view of the pouch case according to an embodiment of the present invention, <FIG> is a cross-sectional view taken along line A-A' of <FIG>, <FIG> is a cross-sectional view taken along line B-B' of <FIG>, and <FIG> is a cross-sectional view taken along line C-C' of <FIG>.

Referring to <FIG>, the pouch case <NUM> according to an embodiment of the present invention may include a first receiving part <NUM> and a second receiving part <NUM> which are formed to receive the electrode assembly <NUM>, the sealing part <NUM> formed along an outer portion of the pouch case <NUM> so as to surround the first receiving part <NUM> and the second receiving part <NUM>, a first partitioning part <NUM> that protrudes upwardly from a bottom surface forming the first receiving part <NUM> and the second receiving part <NUM>, that is, convexly from the bottom surface toward the inside of the first receiving part <NUM> and the second receiving part <NUM>, has an upper end formed at a height lower than that of the sealing part <NUM>, and partitions the first receiving part <NUM> and the second receiving part <NUM> at a predetermined interval, a second partitioning part <NUM> protruding from a side surface connected to the sealing part <NUM> and the bottom surface connected to the side surface, and a third partitioning part <NUM> connecting the first partitioning part <NUM> and the second partitioning part <NUM> to each other.

One first receiving part <NUM> and one second receiving part <NUM> for receiving the electrode assembly <NUM> may be formed in the pouch case <NUM>. The first receiving part <NUM> and the second receiving part <NUM> are formed in a shape which is concavely recessed downwardly in a height direction of the pouch case <NUM> formed in a flat plate shape, and may be formed by pressing the inside of the pouch case <NUM> by pressing or the like. Here, each of the first receiving part <NUM> and the second receiving part <NUM> has a size corresponding to a width and a length of the electrode assembly <NUM>, and a sum of depths of the first receiving part <NUM> and the second receiving part <NUM> may be formed to correspond to a thickness of the electrode assembly <NUM>. In this case, the depths of the first receiving part <NUM> and the second receiving part <NUM> may be a linear distance from an upper surface of the sealing part <NUM> to the bottom surface of each of the first receiving part <NUM> and the second receiving part <NUM>, and the depth of the first receiving part <NUM> may be uniformly formed in both the width direction and the length direction and the depth of the second receiving part <NUM> may also be uniformly formed in both the width direction and the length direction. In addition, although <FIG> illustrates that the depth of the first receiving part <NUM> and the depth of the second receiving part <NUM> are equal to each other, the depth of the first receiving part <NUM> and the depth of the second receiving part <NUM> may be different from each other.

The sealing part <NUM> refers to a portion that is not pressed and remains when the first receiving part <NUM> and the second receiving part <NUM> are formed by pressing the inside of the pouch case <NUM> formed in the flat plate shape by pressing or the like. That is, a portion formed along the outer portion of the pouch case <NUM> to surround the first receiving part <NUM> and the second receiving part <NUM> may be the sealing part <NUM>.

The first partitioning part <NUM> is a portion that convexly protrudes upwardly in the height direction from the bottom surface between the first receiving part <NUM> and the second receiving part <NUM>, and extends along the length direction to partition the first receiving part <NUM> and the second receiving part <NUM> in the width direction. Here, by pressing the pouch case in a state in which a convex portion corresponding to the first partitioning part <NUM> is formed in a lower mold when the first receiving part <NUM> and the second receiving part <NUM> are formed by pressing the inside of the pouch case <NUM> formed in the flat plate shape by pressing or the like, the first partitioning part <NUM> may be formed in a concave form on an outer side of the first receiving part <NUM> and the second receiving part <NUM> and may be formed in a convex form on an inner side thereof. In this case, an upper end of the first partitioning part <NUM> may have a height lower than that of the sealing part <NUM>, and both ends of the first partitioning part <NUM> in the length direction may be formed up to positions spaced apart from both side surfaces of the first receiving part <NUM> and the second receiving part <NUM> in the length direction by a predetermined distance.

The second partitioning part <NUM> is a component for allowing both ends of a side surface part <NUM> of a secondary battery <NUM> in the length direction to be easily folded without being distorted when the sealing part <NUM> is folded to allow the first receiving part <NUM> and the second receiving part <NUM> to face each other so that the pouch case <NUM> forms a receiving space for receiving the electrode assembly <NUM>. The second partitioning part <NUM> may protrude from both side surfaces of the first receiving part <NUM> and the second receiving part <NUM> in the length direction and a bottom surface portion connected to both side surfaces in the length direction, and may have an upper surface formed at the same height as that of the sealing part <NUM>. Here, the second partitioning part <NUM> may be concave on the outer side of the first receiving part <NUM> and the second receiving part <NUM> and may be convex on the inner side thereof by pressing or the like in the manner similar to the first partitioning part <NUM>. In addition, although it is illustrated that the second partitioning part <NUM> has a width greater than that of the sealing part <NUM>, the second partitioning part <NUM> is not limited thereto, and it is possible to adjust the width of the second partitioning part <NUM> according to a thickness T and a shape of the electrode assembly <NUM> or according to a material of the pouch case <NUM>.

The third partitioning part <NUM> is a portion that connects both end portions of the first partitioning part <NUM> in the length direction and the second partitioning part <NUM> to each other in a gentle form. The third partitioning part <NUM> may be concave on the outer side of the first receiving part <NUM> and the second receiving part <NUM> and may be convex on the inner side thereof by pressing or the like in the manner similar to the first partitioning part <NUM> and the second partitioning part <NUM>, and the first partitioning part <NUM>, the third partitioning part <NUM>, and the second partitioning part <NUM> may be integrally formed to be connected to each other by pressing the pouch case in a state in which a convex portion is formed in the lower mold so as to correspond to the forms of the first partitioning part <NUM>, the third partitioning part <NUM>, and the second partitioning part <NUM>. In this case, the third partitioning part <NUM> may be inclined upwardly from an upper end portion of the first partitioning part <NUM> in the length direction to an upper end portion of the second partitioning part <NUM> so that the upper end portion of the first partitioning part <NUM> and the upper end portion of the second partitioning part <NUM> are naturally connected to each other. In addition, a portion at which the third partitioning part <NUM> is connected to the upper end portion of the first partitioning part <NUM> and a portion at which the third partitioning part <NUM> is connected to the upper end portion of the second partitioning part <NUM> may be formed in a round form having a predetermined radius of curvature. In addition, both side surfaces of the third partitioning part <NUM> in the width direction may also be inclined from a side surface of an end portion of the first partitioning part <NUM> in the length direction to the side surface of the second partitioning part <NUM>, and a connected portion may be formed in a round form.

As such, the second partitioning part <NUM>, the third partitioning part <NUM>, and the first partitioning part <NUM> are formed so as to be gently connected without having a discontinuous slope, thereby making it possible to obtain an effect of preventing the second partitioning part <NUM> and the third partitioning part <NUM> positioned on the side surface part <NUM> of the secondary battery <NUM> from being damaged or torn when the pouch case <NUM> is folded.

Referring to <FIG>, the first partitioning part <NUM> is a component for separating the first receiving part <NUM> and the second receiving part <NUM> from each other at a predetermined interval and connecting them to each other, and extends bottom surfaces of the first receiving part <NUM> and the second receiving part <NUM> and connects the bottom surfaces to each other. Here, one side of the first partitioning part <NUM> is connected to the bottom surface of the first receiving part <NUM>, and the other side of the first partitioning part <NUM> is connected to the bottom surface of the second receiving part <NUM>. In addition, the upper end of the first partitioning part <NUM> may have a height lower than that of the sealing part <NUM>, and the first receiving part <NUM> and the second receiving part <NUM> are partitioned by the first partitioning part <NUM>. In addition, as shown, the first partitioning part <NUM> may have a plane part <NUM> which is upwardly extended in a linear form from the bottom surface of the first receiving part <NUM>, a plane part <NUM> which is upwardly extended in a linear form from the bottom surface of the second receiving part <NUM>, and a curved part <NUM> formed in a semi-circular form on an upper end of a pair of plane parts <NUM>.

Thereby, when the secondary battery <NUM> is manufactured using the pouch case <NUM> according to the first embodiment of the present invention, the pouch case <NUM> may be packaged to receive the electrode assembly <NUM> in the receiving space formed by folding the first receiving part <NUM> and the second receiving part <NUM> along a center line of the first partitioning part <NUM> so as to face each other and to then seal the overlapped sealing part <NUM>. Here, the first partitioning part <NUM> may be supported and unfolded by the electrode assembly <NUM> received in the receiving space when the pouch case <NUM> is folded.

<FIG> is a cross-sectional view illustrating a secondary battery according to an embodiment of the present invention and <FIG> is an assembled perspective view illustrating the secondary battery including the electrode assembly and the pouch case according to an embodiment of the present invention.

Referring to <FIG> and <FIG>, the first partitioning part <NUM> may be unfolded in a state in which the secondary battery <NUM> is assembled and may be formed as the side surface part <NUM> of a flat plane form. In addition, a phenomenon in which the sealing parts <NUM> positioned on both ends of the side surface part <NUM> of the secondary battery <NUM> in the length direction are not folded or are dented after the secondary battery <NUM> is manufactured may be prevented.

In addition, a length of a cross section of an upper side surface of the first partitioning part <NUM> may be smaller than a sum of a depth A1 of the first receiving part <NUM> and a depth A2 of the second receiving part <NUM>.

Here, the upper side surface of the first partitioning part <NUM> may be a surface toward the first receiving part <NUM> and the second receiving part <NUM>, and referring to <FIG>, the length of the cross section of the upper side surface of the first partitioning part <NUM> may be a sum B1+B2+B3 of a length B1+B2 of the pair of plane parts <NUM> and a length B3 of the curved part <NUM>. Therefore, the length of the cross section of the upper side surface of the first partitioning part <NUM> may be formed to be A1+A2>B1+B2+B3. In addition, the sum A1+A2 of the depth A1 of the first receiving part and the depth A2 of the second receiving part may be equal to the thickness T of the electrode assembly, i.e., A1+A2=T. In this case, the sum A1+A2 of the depth A1 of the first receiving part and the depth A2 of the second receiving part may be slightly smaller or greater than the thickness T of the electrode assembly depending on the material or shape of the pouch case <NUM>.

Therefore, since the first partitioning part <NUM> is pulled while being unfolded when the pouch case <NUM> is folded so that the electrode assembly <NUM> is received in the receiving space of the pouch case <NUM> when the secondary battery <NUM> is manufactured using the pouch case <NUM> according to an embodiment of the present invention, the first partitioning part <NUM> which becomes the side surface part <NUM> of the secondary battery <NUM> after manufacturing the secondary battery <NUM> may be formed as the side surface part <NUM> of a plane form in a state in which the secondary battery <NUM> is assembled.

Here, the height of the first partitioning part <NUM> may be lower than the depths of the first receiving part <NUM> and the second receiving part <NUM>, and may be <NUM>/<NUM> or more of the depths of the first receiving part <NUM> and the second receiving part <NUM>. In addition, the height of the first partitioning part <NUM> may be preferably <NUM>/<NUM> or more, and more preferably <NUM>/<NUM> or more of the depths of the first receiving part <NUM> and the second receiving part <NUM>. That is, when the height of the first partitioning part <NUM> satisfies the above-mentioned conditions, the shape of the first partitioning part <NUM> does not appear on the side surface part <NUM> of the secondary battery and the side surface part may be formed to be flat. In addition, since it is possible to prevent stress condensation on a folded side surface of the pouch case of the folded side surface, productivity, cooling efficiency and energy density of the secondary battery may all be increased.

In addition, the secondary battery <NUM> using the pouch case <NUM> according to the present invention may include the pouch case <NUM> according to the present invention and the electrode assembly <NUM>, and the pouch case <NUM> is sealed along the sealing part <NUM> after the electrode assembly <NUM> is received in the receiving space formed by folding the sealing part <NUM> so that the first receiving part <NUM> and the second receiving part <NUM> face each other.

As shown, the first partitioning part <NUM> of the pouch case <NUM> uniformly forms the side surface part <NUM> of the secondary battery <NUM>, and dimples <NUM> which are concave toward the inside of the secondary battery <NUM> may be formed at positions corresponding to the second partitioning part <NUM> and the third partitioning part <NUM> of both ends of the side surface part <NUM> of the secondary battery <NUM> in the length direction.

<FIG> is a photograph illustrating a portion in which an extending part and a dimple are formed in the secondary battery according to the present invention and a photograph comparing a conventional secondary battery in which a height of a partitioning part is formed to be equal to a depth of a receiving part.

Referring to the photograph of <FIG>, it may be seen that the secondary battery according to the present invention has the side surface part that does not have a concavely depressed portion as in an upper figure and has an end portion of the side surface part on which the dimple of a concave form is formed. On the other hand, the conventional secondary battery may have a concavely depressed portion which is present along the side surface part as in a lower figure.

The dimple <NUM> serves to guide the sealing parts <NUM> of both ends of the side surface part <NUM> when the pouch case <NUM> is folded, so that the sealing pars <NUM> may be easily folded, and the size and shape may be various according to the height or the width of the second partitioning part <NUM> which is appropriately adjusted according to the thickness T and the shape of the electrode assembly <NUM> or according to the material of the pouch case <NUM>.

As shown, the secondary battery <NUM> using the pouch case <NUM> according to the present invention is characterized in that the side surface part <NUM> is not concavely recessed or does not protrude as a whole and has a flat and uniform form. Thereby, the secondary battery <NUM> according to the present invention may have high heat radiation efficiency with low thermal resistance because the side surface part <NUM> may be perfectly in close contact with the cooling plate <NUM> when the side surface part <NUM> is in contact with the cooling plate <NUM> to cool the side surface part <NUM>.

In addition to this, since the side surface part <NUM> of the secondary battery <NUM> according to the present invention does not protrude and is uniformly formed, the side surface part <NUM> has a fold outwardly formed thereon or has a separating sealing portion. As a result, since the side surface part <NUM> occupies a smaller space for the same battery capacity than when the side surface part <NUM> protrudes, the secondary battery <NUM> according to the present invention may have high energy density.

In addition, the sealing parts <NUM> positioned at portions adjacent to both end portions of the side surface part <NUM> of the secondary battery <NUM> may include extending parts <NUM> protruding in a direction perpendicular to the side surface part <NUM> of the secondary battery <NUM> by a predetermined length in a process of folding the sealing parts <NUM> for packaging. Accordingly, a space may be formed between the extending part <NUM> and the side surface part <NUM> by a length L of the extending part <NUM>.

The extending part <NUM> formed as described above may serve to maintain or fix an arrangement of the secondary battery <NUM> to the cooling plate <NUM> by forming a groove <NUM> or a step <NUM> capable of receiving the extending part <NUM> in a side surface of the cooling plate <NUM>, when the secondary battery <NUM> according to the present invention and the cooling plate <NUM> are coupled to each other to manufacture a secondary battery pack.

<FIG> are views illustrating first to third examples in which the secondary battery <NUM> according to the present invention and the cooling plate <NUM> are coupled to each other to configure the secondary battery pack.

First, <FIG> are a view illustrating a first example of the secondary battery pack according to the present invention and enlarged detailed views thereof.

Referring to <FIG>, a plurality of secondary batteries <NUM> according to the present invention may be disposed on the cooling plate <NUM> to configure the secondary battery pack. Here, the cooling plate <NUM> includes a first side surface, a second side surface opposing the first side surface, and an upper surface with which the side surface parts <NUM> of one or more secondary batteries <NUM> are in surface-contact.

According to the first example of the secondary battery pack shown in <FIG>, a width between the first side surface and the second side surface of the cooling plate <NUM> may correspond to a length between the extending parts <NUM> of the secondary batteries <NUM>. Referring to <FIG> and <FIG>, in this case, when the upper surface of the cooling plate <NUM> is in close contact with the side surface parts <NUM> of the secondary batteries <NUM>, the cooling plate <NUM> may be inserted between the extending parts <NUM> of the secondary batteries <NUM>.

By such a structure, the secondary battery <NUM> is limited from moving in the length direction of the secondary battery <NUM> to prevent a position thereof from being separated from the cooling plate <NUM>, and the arrangement between the secondary battery <NUM> and the cooling plate <NUM> may be maintained.

<FIG> are a view illustrating a second example of the secondary battery pack according to the present invention and enlarged detailed views thereof.

According to the second example of the secondary battery pack shown in <FIG>, a width between the first side surface and the second side surface of the cooling plate <NUM> may be greater than a length between the extending parts <NUM> of the secondary batteries <NUM>, and each of the first side surface and the second side surface of the cooling plate <NUM> may be formed with a step <NUM> at a height which is greater than or equal to a predetermined protruded length of the extending part <NUM> of the secondary battery <NUM>. Referring to <FIG> and <FIG>, when the upper surface of the cooling plate <NUM> is in close contact with the side surface parts <NUM> of the secondary batteries <NUM>, the extending parts <NUM> of the secondary batteries <NUM> may be placed on a step portion formed on the cooling plate <NUM>.

By such a structure, the secondary battery <NUM> is limited from moving in the length direction of the secondary battery <NUM> to prevent a position thereof from being separated from the cooling plate <NUM>, and the arrangement between the secondary battery <NUM> and the cooling plate <NUM> may be maintained. In addition to this, a width of the cooling plate <NUM> of he secondary batter pack according to the second example is more extended than the width of the cooling plate <NUM> according to the first example, thereby further increasing the cooling efficiency.

<FIG> are a view illustrating a third example of the secondary battery pack according to the present invention and enlarged detailed views thereof.

According to the third example of the secondary battery pack shown in <FIG>, a width between the first side surface and the second side surface of the cooling plate <NUM> may be greater than a length between the extending parts <NUM> of the secondary batteries <NUM>, and each of the first side surface and the second side surface of the cooling plate <NUM> may be formed with one or more grooves <NUM> at a depth which is greater than or equal to a predetermined length of the extending part <NUM> so as to receive the extending parts <NUM> of the secondary batteries <NUM>. Referring to <FIG> and <FIG>, when the upper surface of the cooling plate <NUM> is in close contact with the side surface parts <NUM> of the secondary batteries <NUM>, the extending parts <NUM> of the secondary batteries <NUM> may be received in the grooves <NUM> formed in the cooling plate <NUM>.

By such a structure, the secondary battery <NUM> is limited from moving in the length direction of the secondary battery <NUM> and a direction perpendicular thereto to prevent a position thereof from being separated from the cooling plate <NUM>, and the arrangement between the secondary battery <NUM> and the cooling plate <NUM> may be maintained. In addition to this, a width of the cooling plate <NUM> of he secondary batter pack according to the third example is more extended than the width of the cooling plate <NUM> according to the first example, thereby further increasing the cooling efficiency.

Referring to <FIG>, in the secondary battery pack according to the present invention, the side surface part <NUM> of each of the plurality of secondary batteries <NUM> disposed on the cooling plate <NUM> may be disposed to be in close contact with the cooling plate <NUM> to perform heat radiation of the secondary batteries <NUM>, and by the extending parts <NUM> protruding from the side surface parts <NUM> of the secondary batteries <NUM> by the predetermined length, the secondary batteries <NUM> may be limited from moving in the length direction of the secondary batteries <NUM> with respect to the cooling plate <NUM> to prevent the positions thereof from being separated from the cooling plate <NUM>, and the arrangement between the secondary battery <NUM> and the cooling plate <NUM> may be maintained.

In the pouch case and the secondary battery using the same according to the present invention, one side surface of the secondary battery may be in close contact with the cooling plate to maximize the cooling efficiency by allowing one side surface of the secondary battery to have the perfect cooling structure.

Claim 1:
A pouch case (<NUM>) for receiving and packaging an electrode assembly (<NUM>), the pouch case (<NUM>) comprising:
a first receiving part (<NUM>) and a second receiving part (<NUM>) which are concavely formed;
a sealing part (<NUM>) formed along an outer portion of the pouch case (<NUM>) so as to surround the first receiving part (<NUM>) and the second receiving part (<NUM>); and
a partitioning part formed between the first receiving part (<NUM>) and the second receiving part (<NUM>) and protruding from a bottom surface of each receiving part (<NUM>, <NUM>) to partition the first receiving part (<NUM>) and the second receiving part (<NUM>),
wherein the partitioning part includes:
a first partitioning part (<NUM>) having an upper end having a height lower than that of the sealing part (<NUM>) and partitioning the first receiving part (<NUM>) and the second receiving part (<NUM>) at a middle of the partitioning part;
a second partitioning part (<NUM>) having an upper surface having the same height as that of the sealing part (<NUM>) at both ends of the partitioning part; and
a third partitioning part (<NUM>) connecting the first partitioning part (<NUM>) and the second partitioning part (<NUM>) to each other,
wherein the first partitioning part (<NUM>) includes a curved part(<NUM>) having an upper end portion formed in a curved cross section.