KR101293971B1 - Cooling Member of Improved Cooling Efficiency and Battery Module Employed with the Same - Google Patents

Abstract

The present invention is a battery cell that is mounted on the upper or lower portion of the battery module or a plurality of unit modules consisting of a pair or more of the battery cells are arranged side by side or the battery pack is charged or discharged A cooling member for removing the heat generated from the heat conducting medium consisting of an upper plate and a lower plate located on the top or bottom of the battery module or battery pack and separated; And a hollow structure in which the refrigerant flows therein, the first conduit mounted between the upper plate and the lower plate, and the first conduit connected to the first conduit and positioned at the front and / or rear of the battery module or the battery pack. Refrigerant conduit consisting of two conduits; wherein the first plate is mounted in the upper plate and the lower plate is formed with an indentation groove in the longitudinal direction of the heat conducting medium, the interface between the plate and the first conduit It provides a cooling member made of a shape that can be in surface contact even when the dimension error between the first conduit and the first conduit.

Description

Cooling Member of Improved Cooling Efficiency and Battery Module Employed with the Same}

The present invention relates to a cooling member having an improved cooling performance and a battery module including the same. More particularly, a battery module or a plurality of batteries in which a plurality of unit modules consisting of a pair or more battery cells are arranged side by side Cooling member mounted on the top or bottom of the battery pack is arranged side by side to remove the heat generated from the battery cell during charging and discharging, the heat conducting medium consisting of a top plate and a bottom plate separated up and down; And a refrigerant conduit including a first conduit mounted between the upper plate and the lower plate, and a second conduit connected to the first conduit, wherein the first conduit is mounted on the upper plate and the lower plate. An indentation groove is formed in the longitudinal direction of the heat conduction medium, and the interface between the plate and the first conduit relates to a cooling member having a shape that can be in surface contact even when a dimension error occurs between the plate and the first conduit.

BACKGROUND ART [0002] In recent years, rechargeable secondary batteries have been widely used as energy sources for wireless mobile devices. In addition, the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (HEV), and the like, which are proposed as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels (Plug-In HEV) and the like.

In a small mobile device, one or two or more battery cells are used per device, while a middle- or large-sized battery module such as an automobile is used as a middle- or large-sized battery module in which a plurality of battery cells are electrically connected due to the necessity of a large-

Since the middle- or large-sized battery module is preferably manufactured in a small size and weight, a prismatic battery, a pouch-shaped battery, and the like, which can be charged with a high degree of integration and have a small weight to capacity ratio, are mainly used as the battery cells of the middle- or large-sized battery modules. In particular, a pouch-shaped battery using an aluminum laminate sheet or the like as an exterior member has recently attracted a lot of attention due to its advantages such as small weight, low manufacturing cost, and easy shape deformation.

Since the battery cells constituting the medium-large battery module are composed of secondary batteries capable of charging and discharging, such a high output large capacity secondary battery generates a large amount of heat during the charging and discharging process. Particularly, since the laminate sheet of the pouch-type battery widely used for the battery module has a surface coated with a polymer material having low thermal conductivity, it is difficult to effectively cool the temperature of the entire battery cell.

If the heat of the battery module generated during the charging and discharging process can not be effectively removed, heat accumulation may occur, thereby accelerating the deterioration of the battery module and possibly causing ignition or explosion. Therefore, a medium-large battery pack for a vehicle including a plurality of medium-large battery modules and a high-output large-capacity battery or a medium-large battery pack for a power storage device requires a cooling system for cooling the battery cells embedded therein.

Therefore, a battery module mounted in a medium-large battery pack is generally manufactured by stacking a plurality of battery cells with high density, and stacking adjacent battery cells at regular intervals to remove heat generated during charging and discharging. . For example, the battery cells themselves are sequentially stacked while being spaced at predetermined intervals without a separate member, or in the case of battery cells having low mechanical rigidity, one or more combinations are built in a cartridge or the like to form a unit module and such a unit. A plurality of modules can be stacked to form a battery module. Using the cartridge in the manufacture of the battery module has the advantage of increasing mechanical rigidity, but has the disadvantage of increasing the size of the entire battery module.

In addition, the coolant flow path is formed between the battery cells or the battery modules so that heat accumulated between the stacked battery cells or the battery modules can be effectively removed.

In the case where the cooling structure is a water-cooled cooling system, in particular, a structure having a circular interface between the refrigerant conduit and the heat conduction medium is mainly used.

However, when manufacturing the refrigerant conduit of the above structure, the processing precision is low or the shape error occurs, if the refrigerant conduit is smaller or larger than the normal dimension, it is not possible to achieve a close contact with the heat conducting medium, the cooling heat of the refrigerant conduit is a heat conducting medium Since it is locally delivered to, there is a problem that the cooling performance of the battery module connected to the heat conduction medium is reduced.

In this regard, referring to FIG. 1, a refrigerant conduit having a circular cross section is located above the heat conducting medium. As shown in FIG. 1A, when the refrigerant conduit 40a does not generate dimension and shape errors, the heat conduction medium 46 and the refrigerant conduit 40a achieve ideal surface contact.

However, when the refrigerant conduit 40a is smaller than the normal dimension as shown in FIG. 1 (b), the heat conduction medium 46 and the refrigerant conduit 40a are in point contact at one point a in a vertical cross section, and FIG. 1 (c). In the case where the refrigerant conduit 40b is larger than the normal dimension, the thermally conductive medium 46 and the refrigerant conduit 40b are in point contact at this point (b) on the vertical cross section. Since the point contact on the vertical cross section is only a line contact in three-dimensional aspect, the cooling heat of the refrigerant conduits (40b, 40c) is transferred in a conductive manner only to the line contact portion of the heat conduction medium 46, so that the heat conduction medium 46 is There is a problem that the cooling performance of the battery module (not shown) is mounted is significantly reduced.

Therefore, even when a dimension or shape error occurs in the manufacture of the refrigerant conduit, there is a very high need for a cooling member and a battery module having excellent safety using the same, by easily achieving close contact between the refrigerant conduit and the heat conducting medium, thereby improving cooling performance. to be.

In this regard, an object of the present invention, in order to solve the above problems, an indentation groove is formed in the longitudinal direction of the heat conducting medium in the upper plate and the lower plate in the site where the first conduit is mounted, the interface between the plate and the first conduit The silver plate and the first conduit have a shape that can be in surface contact even when a dimension error between each other, thereby providing a cooling member to easily achieve the close contact between the upper plate and the lower plate and the first conduit to improve the cooling performance of the battery module. It is.

The cooling member according to the present invention for achieving the above object is a battery pack or a plurality of battery modules are arranged side by side of a plurality of unit modules consisting of a pair or more battery cells of the battery pack Cooling member mounted on the upper or lower part to remove heat generated from the battery cell during charging and discharging,

A heat conduction medium formed of an upper plate and a lower plate disposed on an upper side or a lower side of the battery module or the battery pack and separated from each other; And

A hollow structure in which the refrigerant flows therein, the first conduit mounted between the upper plate and the lower plate, and the second conduit connected to the first conduit and positioned on the front and / or rear of the battery module or the battery pack. A refrigerant conduit consisting of conduits;

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Indentation grooves are formed in the longitudinal direction of the heat conducting medium in the upper plate and the lower plate at the site where the first conduit is mounted, and the interface between the plate and the first conduit is in surface contact when a dimension error occurs between the plate and the first conduit. It consists of shapes that can be.

Therefore, in the cooling member according to the present invention, an indentation groove is formed in the longitudinal direction of the heat conducting medium in a portion where the first conduit is mounted on the upper plate and the lower plate, and the interface between the plate and the first conduit is between the plate and the first conduit. By having a shape that can be in surface contact in the event of a dimensional error of the, it is possible to improve the adhesion between the first conduit and the heat conduction medium, ultimately to provide a high cooling efficiency.

In addition, since the heat conducting medium is vertically separated into the upper plate and the lower plate, it is possible to easily achieve mutual coupling by mounting the first conduit on the lower plate and then covering the upper plate on the upper plate.

In one preferred embodiment, the first conduit and the second conduit may be a structure formed integrally.

Therefore, the cooling member of the structure has a heat conduction medium is vertically separated and the first conduit and the second conduit are integrally connected, it is possible to effectively prevent the leakage-related problems occurring at the connection between the first conduit and the second conduit. .

In addition, since a separate fastening portion is not required to be formed on a portion of the heat conducting medium to connect the heat conducting medium and the first conduit like the conventional cooling member, the assembly productivity and the assembly reliability of the cooling member can be greatly improved.

In another preferred embodiment, the second conduit has a structure that is respectively located on the front and rear of the battery module or battery pack, the refrigerant introduced into one second conduit cools the heat conducting medium while passing through the first conduit. After moving to another second conduit, in this process the heat conduction medium to cool the battery module.

The first conduit is preferably connected vertically with respect to the second conduit so that the refrigerant introduced into the second conduit can branch and flow into the first conduit.

In another example, the first conduit is composed of at least two or more pipes, so that the cooling efficiency of the battery module or the battery pack can be improved compared to the structure of the first conduit consisting of one pipe.

Preferably, since the second conduit has a larger diameter than the first conduit, the refrigerant introduced into the second conduit has a faster flow rate than the second conduit while passing through the first conduit, thereby cooling the battery module or the battery pack. The efficiency can be improved.

As a specific example, the second conduit may have a size of 2 to 5 times the diameter of the first conduit. If the diameter of the second conduit is less than twice the diameter of the first conduit, it may be difficult to increase the flow rate of the refrigerant of the second conduit to a desired level. If the diameter of the second conduit exceeds 5 times, the overall size of the battery module or the battery pack increases. Therefore, it is not preferable. However, if the size can exert the above-described effect, it may be possible that a range outside of the size condition may be possible.

In one preferred embodiment, the indentation groove is a polygonal shape of the inner surface on the vertical cross-section, the first conduit is a polygonal shape of the shape corresponding to the indentation groove on the vertical cross-section, the indentation groove and the first conduit The interface of may have a structure in surface contact with at least one surface. Examples of the polygons include triangles, squares, pentagons, hexagons, and the like.

In one specific example, the indentation groove has a rhombic shape of the inner surface on the vertical cross-section, the first conduit is made of a rhombic shape of the shape corresponding to the indentation groove on the vertical cross-section, the indentation groove and the first conduit The interface of may be a structure in surface contact on at least two surfaces.

In some cases, the first conduit may have a circular hollow structure in a vertical cross section, and may be a structure in which a part of the outer circumferential surface of the first conduit is surrounded by a packaging member having a rhombic shape in the vertical cross section.

In this case, a portion of the outer member surrounding the outer circumferential surface of the first conduit corresponds to a portion where the first conduit is in close contact with the upper plate and the lower plate.

On the other hand, the refrigerant conduit is preferably made of a thermally conductive corrosion resistant material, it is possible to prevent corrosion by moisture even if the refrigerant flows through the refrigerant conduit.

The heat conduction medium may be a heat sink, which refers to an object that absorbs and dissipates heat from another object by thermal contact.

The heat conduction medium may be formed in various forms and arrangements, for example, each battery module or a battery pack unit. That is, the heat conduction medium may have a separate type in a battery module unit or an integrated type in a battery pack unit.

In one preferred example, the cooling member may have a structure including a cooling fin that can be interposed between the unit modules in a state in which both sides are in close contact with each of the unit modules, in this case, the refrigerant is the first conduit and the first conduit The cooling heat is sequentially transferred to the heat conducting medium and the cooling fins while flowing through the two conduits, and the heat of cooling can effectively cool the unit modules.

In a preferred example of the structure, the cooling fin may be a structure that is bent in a shape that is in surface contact with the heat conducting medium.

That is, when the cooling fins are interposed between the unit modules, since the cooling fins are in surface contact with the heat conducting medium, the heat dissipation effect by the heat conduction can be maximized.

In another example of the structure, the cooling fin is not particularly limited as long as it is in a shape that can be in close contact with the unit modules, for example, it is made of "a", or "T" shape in the vertical section from the heat conducting medium Cooling heat can be effectively transmitted to the unit modules.

Specifically, the "T" shape may be formed by a combination of the "1" shape and the "T shape".

The cooling fin is not particularly limited as long as the material has excellent thermal conductivity for the expression of high cooling efficiency. For example, the cooling fin may be made of a metal material having high thermal conductivity.

The battery cell is preferably a plate-shaped secondary battery having a thin thickness and a relatively wide width and length so as to minimize the overall size when stacked for the configuration of the battery module. Preferred examples of such a plate-shaped secondary battery include a rectangular secondary battery and a pouch-type secondary battery, among which an electrode assembly is embedded in an electrode assembly accommodating portion formed in a battery case of a laminate sheet including a metal layer and a resin layer. Particularly preferred is a pouch type secondary battery having a sealing portion (" outer circumferential surface sealing portion ") sealed on the outer circumferential surface of the electrode assembly accommodating portion.

On the other hand, the refrigerant is not particularly limited as long as the refrigerant flows easily in the refrigerant conduit and has excellent cooling property. For example, the refrigerant may be water capable of maximizing cooling efficiency due to high latent heat.

The present invention also provides a battery module comprising the cooling member.

Therefore, the battery module according to the present invention has a structure in which a plurality of unit modules consisting of one or more battery cells are arranged side by side, and the cooling member is mounted on the top or bottom of the battery module. Is done. That is, the battery module can be configured to greatly improve the cooling efficiency and to improve the assemblability by the heat conduction medium and the refrigerant conduit of the cooling member.

The present invention also provides a battery pack in which a plurality of the battery modules are arranged side by side.

The battery pack includes a plurality of battery modules to achieve a high output large capacity, the electric vehicle, hybrid electric vehicle, plug-in hybrid electric vehicle, or power storage device in which high heat generated during charging and discharging seriously emerges in terms of safety It can be used preferably for power supplies, such as a.

As described above, in the cooling member according to the present invention, the indentation groove is formed in the longitudinal direction of the heat conducting medium in the portion where the first conduit is mounted in the upper plate and the lower plate, and the interface between the plate and the first conduit is a plate. By forming a shape that can be in surface contact in the event of a dimension error between the first and the first conduit, it is possible to easily achieve the close contact between the upper plate and the lower plate and the first conduit to improve the cooling performance of the battery module.

In addition, since corrosion resistance to the refrigerant is required only for the refrigerant conduit, which is a part of the cooling member, the overall manufacturing cost is advantageous.

1 is a schematic cross-sectional view showing a line contact state between a conventional refrigerant conduit and a heat conductive medium;
2 is a perspective view of a cooling member according to one embodiment of the present invention;
3 is an enlarged perspective view of part B of FIG. 2;
Figure 4 is a schematic cross-sectional view showing a surface contact state of the exterior member and the indentation groove of Figure 2;
5 is a perspective view illustrating a state in which the lower plate of FIG. 2 is mounted on a battery module;
6 is a perspective view illustrating a state in which the cooling member of FIG. 2 is mounted on a battery module;
FIG. 7 is a schematic cross-sectional view illustrating a AA ′ portion of the battery module of FIG. 6; FIG.
8 is a schematic cross-sectional view of a cooling fin according to another embodiment of the present invention;
9 and 10 are perspective views of a battery pack according to another embodiment of the present invention;
11 is a perspective view of the cooling member of FIG. 9;
12 is a schematic cross-sectional view showing a surface contact state between a first conduit and an indentation groove according to another embodiment of the present invention;
13 is a perspective view of one exemplary plate-shaped battery cell mounted to the battery module of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

2 is a perspective view schematically showing a cooling member according to an embodiment of the present invention, Figure 3 is a perspective view showing an enlarged portion B of FIG.

Referring to these drawings, the cooling member 70 is formed of a heat conduction medium consisting of an upper plate 60 and a lower plate 50 separated up and down, and a first conduit 40 and a hollow structure in which a refrigerant flows therein. It contains two conduits 30.

In addition, a pair of indentation grooves 52 are formed at the upper plate 60 and the lower plate 50 in the longitudinal direction L of the heat conducting medium, respectively, at the site where the first conduit 40 is mounted. The interface between the 60 and the lower plate 50 and the first conduit 40 is the surface contact between the upper plate 60 and the lower plate 50 and the first conduit 40 even if the dimension error occurs in the manufacturing process. It consists of possible shapes. In addition, a portion of the first conduit 40 coupled to the upper plate 60 and the lower plate 50 is surrounded by an outer member 42 having a rhombus shape in a vertical cross section.

That is, the indentation grooves 52 of the upper plate 60 and the lower plate 50 are formed in a vertical cross-section with an inner surface in a rhombic shape, and the exterior member 42 of the first conduit 40 has an upper surface in a vertical cross section. It consists of a lozenge shape 42 of a shape corresponding to the indentation groove 52 of the plate 60 and the lower plate 50, so that the interface between the indentation grooves 50, 52 and the exterior member 42 is two sides. If you are in contact.

On the other hand, the first conduit 40 is mounted between the upper plate 60 and the lower plate 50, the second conduit 30 is integrally connected to the first conduit 40, the battery module 80 It is located at the front and back of each.

In addition, the first conduit 40 is composed of two pipes, the second conduit 30 has a larger diameter than the first conduit 40, approximately three times the diameter of the first conduit 40 It consists of the size of.

The first conduit 40 and the second conduit 30 are circular in a vertical cross section and are made of a corrosion resistant material to prevent corrosion due to the refrigerant.

In addition, the indentation groove 52 having a shape corresponding to the exterior member 42 is in the longitudinal direction (L) of the heat conducting medium at the site where the exterior member 42 is mounted on the upper plate 60 and the lower plate 50. The upper plate 60 and the lower plate 50 are formed by covering the upper plate 60 with the lower plate 50 in a state where the exterior member 42 is mounted in the indentation groove 52 of the lower plate 50. ) Is achieved.

4 is a schematic cross-sectional view showing a surface contact state between the exterior member and the lower plate of FIG. 2.

Specifically, referring to FIG. 4 together with FIG. 2, an exterior member 42a having a vertical cross-section formed in a rhombus and surrounding a portion of the first conduit 40a is formed of the indentation groove 52 of the lower plate 50. It is mounted on the top. As shown in FIG. 4A, when the exterior member 42a does not have a dimension or shape error, the indentation groove 52 of the lower plate 50 and the exterior member 42a achieve surface contact as a whole.

In addition, as shown in FIG. 4B, even when the exterior member 42b is smaller than the regular dimension, the interface between the indentation groove 52 of the lower plate 50 and the exterior member 42b is substantially in surface contact, and FIG. 4. Even when the exterior member 42c is larger than the normal dimension as shown in (c), the interface between the indentation groove 52 of the lower plate 50 and the exterior member 42c comes into surface contact on two surfaces, and thus the exterior member 42c The heat of cooling is transmitted to the whole of the indentation groove 52 interface of the lower plate 50 to improve the cooling performance compared to FIG.

FIG. 5 is a perspective view schematically showing a state in which the lower plate of FIG. 2 is mounted on the battery module, and FIG. 6 is a perspective view schematically showing a state in which the cooling member of FIG. 2 is mounted on the battery module. have. In addition, FIG. 7 is a schematic cross-sectional view showing an AA ′ portion of the battery module of FIG. 6. In these figures, the electrode terminals of the battery cell are not shown for convenience.

First, referring to FIG. 5 together with FIG. 7, the battery module 80 includes four unit modules 12 including a pair of battery cells 10 arranged side by side, and an upper surface of the battery module 80 is provided. The lower plate 52 is mounted.

Next, referring to FIGS. 6 and 7, the cooling fins 20 are interposed between the unit modules 12 in a state in which both sides of the cooling fins 20 are in close contact with the unit modules 12, respectively. ) Is bent into a shape in contact with the surface.

In addition, the cooling fins 20 has a shape of "a" shape in the vertical section, and is made of a thermally conductive metal sheet.

8 is a schematic cross-sectional view of a cooling fin according to another embodiment of the present invention.

Referring to FIG. 8, the cooling fin is the same as the structure of FIG. 7 except that the cooling fin is formed of a combination of a “T” shape 24 and a “1” shape 22 in a vertical section, and thus a detailed description thereof will be omitted.

9 and 10 schematically show a perspective view of a battery pack according to another embodiment of the present invention, Figure 11 schematically shows a perspective view of the cooling member of FIG. In these drawings, the exterior member is not shown for convenience.

Referring to these drawings, the battery pack 200 of FIG. 9 has four battery modules of FIG. 1 arranged side by side, and a heat conduction medium 90 composed of an upper plate 92 and a lower plate 94 includes a battery module. Each is mounted on the upper part of the battery module to remove the heat generated from the battery cell during charging and discharging.

The cooling member comprises a heat conducting medium consisting of four upper plates 92 and a lower plate 94, eight first conduits 98 and a pair of second conduits 96.

The battery pack 200a of FIG. 10 is the same as the battery pack 200 of FIG. 9 except that the heat conduction medium 90a includes one upper plate 92a and the lower plate 94a. Let's do it.

12 is a schematic cross-sectional view showing a surface contact state of the first conduit and the indentation groove according to another embodiment of the present invention.

Referring to FIG. 12, the first conduits 40d, 40e, and 40f have a rhombus shape and a hollow structure with an outer circumferential surface and an inner circumferential surface, and a separate exterior member is wrapped around the outer circumferential surfaces of the first conduits 40d, 40e and 40f. Except for the same, since the structure is the same as that of FIG. 4, detailed description thereof will be omitted.

13 is a perspective view schematically showing one exemplary plate-shaped secondary battery mounted to the battery module of the present invention.

Referring to FIG. 13, the plate-shaped secondary battery 100 has a structure in which two electrode leads 110 and 120 face each other and protrude from an upper end portion and a lower end portion of the battery case 130.

The battery case 130 is a laminate sheet including a metal layer and a resin layer. The battery case 130 has an upper / lower unit and an electrode assembly having an anode / separation membrane / cathode structure in an electrode assembly accommodating part 140 formed on an inner surface thereof (not shown). And the sealing unit 150 is formed by sealing the both side surfaces 150b, the outer circumferential surface of the electrode assembly accommodating part 140, the upper end 150a, and the lower end 150c by heat fusion, thereby forming the sealing part 150. ) Is made.

Since the electrode leads 110 and 120 protrude from the upper end 150a and the lower end 150c, the electrode leads 110 and 120 may be formed in consideration of the thickness of the electrode leads 110 and 120 and the heterogeneity with the material of the battery case 130. It is comprised by the structure heat-sealed in the state which interposed the film-like sealing member 160 between the leads 110 and 120. FIG.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (21)

A plurality of unit modules consisting of one or more battery cells are mounted on the top or bottom of the battery module or a plurality of battery modules are arranged side by side to generate from the battery cell during charge and discharge As a cooling member to remove heat,
A heat conduction medium formed of an upper plate and a lower plate disposed on an upper side or a lower side of the battery module or the battery pack and separated from each other; And
A hollow structure in which the refrigerant flows therein, the first conduit mounted between the upper plate and the lower plate, and the second conduit connected to the first conduit and positioned on the front and / or rear of the battery module or the battery pack. A refrigerant conduit consisting of conduits;
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Indentation grooves are formed in the longitudinal direction of the heat conducting medium in the upper plate and the lower plate at the site where the first conduit is mounted, and the interface between the plate and the first conduit is in surface contact when a dimension error occurs between the plate and the first conduit. Cooling member, characterized in that formed in the shape that can be. The cooling member according to claim 1, wherein the first conduit and the second conduit are integrally formed. The cooling member of claim 1, wherein the second conduit is positioned on the front and rear surfaces of the battery module or the battery pack, respectively. 2. The cooling member of claim 1 wherein said first conduit is connected perpendicular to said second conduit. The cooling member of claim 1, wherein the first conduit consists of at least two or more pipes. The cooling member of claim 1 wherein the second conduit is larger in diameter than the first conduit. The indentation groove of claim 1, wherein the indentation groove has a polygonal shape on an inner surface thereof in a vertical cross section, and the first conduit has a polygonal shape of a shape that corresponds to the indentation groove in a vertical cross section. Cooling member, characterized in that the interface of at least one surface contact. The indentation groove of claim 1, wherein the indentation groove has a diamond-shaped inner surface on a vertical cross section, and the first conduit has a lozenge shape of a shape corresponding to the indentation groove on a vertical cross section. Cooling member, characterized in that the interface of at least two surfaces in contact with the surface. The cooling member of claim 1, wherein the refrigerant conduit is made of a corrosion resistant material. The cooling member of claim 1, wherein the heat conduction medium is a heat sink. The cooling member according to claim 1, wherein the heat conduction medium is formed of each battery module or battery pack unit. The cooling member of claim 1, wherein the cooling member further comprises a cooling fin that may be interposed between the unit modules in a state in which both surfaces are in close contact with each of the unit modules. The cooling member according to claim 12, wherein the cooling fin is bent in a shape that is in surface contact with the heat conducting medium. 13. The cooling member according to claim 12, wherein the cooling fins have a "-" shape or a "T" shape in a vertical section. 13. The cooling member of claim 12, wherein the cooling fins are thermally conductive metal plates. The cooling member according to claim 1, wherein the battery cell is a plate-shaped secondary battery. The cooling member according to claim 16, wherein the plate-shaped secondary battery is a pouch type secondary battery in which an electrode assembly having a cathode / separation membrane / cathode structure is built in a battery case of a laminate sheet including a resin layer and a metal layer. . The cooling member of claim 1, wherein the refrigerant is water. A battery module comprising a cooling member according to any one of claims 1 to 18. A battery pack, characterized in that a plurality of battery modules according to claim 19 are arranged side by side. The battery pack according to claim 20, wherein the battery pack is used in an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.

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