KR20160041256A - Cooling member of improved cooling performance and battery module comprising the same - Google Patents

Abstract

Provided are a cooling member which can secure durability for a long period of time while improving cooling performance, and a battery module which provides a large amount of high power using the same, can be manufactured as a simple and compact structure, and has excellent durability and safety due to high cooling performance. According to the present invention, the cooling member is mounted in an upper part and/or a lower part of a battery cell stacked body where battery cells are staked, and removes heat generated from the battery cell when charging and discharging. The cooling member comprises: a heat sink with a hollow hole structure positioned in the upper part and/or the lower part of the battery cell stacked body, and having a passage where a refrigerant flows therein; and one or more structures provided inside the passage, and increasing a heat transfer area by getting close to a downstream region of a flow of the refrigerant.

Description

[0001] The present invention relates to a cooling member having improved cooling performance and a battery module including the cooling member,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling member with improved cooling performance and a battery module including the cooling member, and more particularly to a cooling member mounted on a stacked battery cell stacked with plate- .

BACKGROUND ART [0002] In recent years, rechargeable secondary batteries have been widely used as energy sources for wireless mobile devices. Also, the secondary battery is attracting attention as a power source for an electric vehicle (EV) and a hybrid electric vehicle (HEV), which are suggested as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels .

BACKGROUND ART A middle- or large-sized device such as an automobile uses a battery module in which a plurality of battery cells are electrically connected and a middle- or large-sized battery pack including the same as a unit module due to the necessity of a high output large capacity. Since the battery module and the battery pack are preferably manufactured with a small size and a weight, a prismatic battery, a pouch-shaped battery, or the like, which can be stacked at a high density and have a small weight to capacity ratio, are mainly used as unit cells of a battery module.

Generally, a battery module is manufactured by stacking a plurality of battery cells at a high density, and the battery cells constituting the battery module generate a large amount of heat in a charge and discharge process. 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 cooling member for cooling the battery cells built in the high-power, large-capacity battery module and the battery pack in which the battery module is mounted is necessarily required.

1A to 1C illustrate a conventional battery module. FIG. 1A is a perspective view of a battery module, FIG. 1B is a front view, and FIG. 1C is a side view.

As shown in the drawings, a heat sink 30 is disposed on one side of a battery cell stack 20 in which a plurality of battery cells 10 are stacked to remove heat between stacked battery cells 10, The heat sink (30) is provided with a flow passage (40) of cooling water.

However, in this structure, since the structure in which the cooling water flowing in the flow path 40 enters the inlet and exits to the outlet as shown by an arrow, it is necessary to use the structure so that the side closer to the inlet side is cooled more and the side closer to the outlet side is less There is a problem to be cooled. That is, since the temperature of the cooling water is increased as the distance from the inlet is closer to the outlet, the cooling heat is reduced, and thus the cooling efficiency is lowered. As a result, a temperature deviation occurs at the cooling start point and the ending point of the battery cell in the battery module, and this temperature deviation leads to a performance deviation of the battery cell, leading to deterioration of the performance of the system.

Accordingly, it is possible to provide a cooling member capable of ensuring durability reliability in the long term while improving cooling performance, and a cooling member capable of being manufactured with a simple and compact structure while providing a high output large capacity power by using the same, There is a high need for a battery module.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cooling member capable of reducing the temperature deviation of a battery cell and improving durability reliability over a long period of time without using many members.

Another problem to be solved by the present invention is to provide a battery module having such a cooling member, which is excellent in lifetime characteristics and safety due to high cooling performance despite its compact structure.

Another object of the present invention is to provide a battery pack including the battery module as a unit module and a device including the battery pack.

According to an aspect of the present invention, there is provided a cooling member mounted on an upper portion and / or a lower portion of a battery cell stack in which battery cells are stacked to remove heat generated from the battery cells during charging and discharging, A heat sink having a hollow structure which is located at an upper portion and / or a lower portion of the laminate and in which a flow path for flowing a coolant is formed; And at least one structure provided in the flow passage and having a heat transfer area increasing toward the downstream side of the refrigerant flow.

The refrigerant may be a gas or a liquid.

The structure may be mounted near the battery cell stack of the body of the heat sink.

The structure may be a shark fin cooling pin gradually increasing in height along the refrigerant flow direction. At this time, the cooling fins may be arranged alone or in rows in rows. The cooling fins may be formed continuously or discontinuously along the refrigerant flow direction.

The structure may be a plurality of protrusions having a gradually increased surface area or a larger protrusion dimension along the refrigerant flow direction. The protrusion may be a hemispherical dome, a polygonal column or a square pin, and the protrusion may be arranged in rows.

In a preferred embodiment, the cooling member further includes a heat absorbing plate interposed between the battery cells, and the heat sink is connected to the heat absorbing plate to radiate heat conducted from the heat absorbing plate. The endothermic plate may be "a" or "T" The heat absorbing plate may be a thermally conductive metal plate. The heat sink and the heat absorbing plate may be coupled with a contact thermal resistance reducing junction. The contact thermal resistance reducing junction may be formed by a thermally conductive grease, a thermally conductive epoxy-based bond, a thermally conductive silicone pad, a thermally conductive adhesive tape, a graphite sheet, and a graphite sheet.

The battery cell may be a plate-shaped battery cell, and the battery cell stack may be formed by stacking the battery cells so that one surface or both surfaces of the battery cell faces the adjacent battery cells. In one specific example, the plate-shaped battery cell is a pouch-shaped battery cell having a structure in which an outer circumferential surface of a battery case is thermally fused and sealed by sealing an electrode assembly in a battery case of a laminate sheet including a resin layer and a metal layer, The outer circumferential surfaces of the pouch-shaped battery cells are fixed by heat-sealing to fix the battery cells to form a battery cell stack.

The present invention also provides a battery module including the above-described cooling member, and a battery pack in which a plurality of such battery modules are arranged side by side.

The battery pack may be manufactured by assembling the battery module as a unit module according to a desired output and capacity. In consideration of mounting efficiency and structural stability, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, A storage device, etc., but the scope of application is not limited thereto.

Accordingly, the present invention provides a device comprising the battery pack as a power source, and the device can be specifically an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a power storage device.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, the cooling member according to the present invention includes the structure in which the heat transfer area increases toward the downstream side of the refrigerant flow, so that the heat radiation amount on the downstream side is larger than the heat radiation amount on the upstream side. As a result, the entire battery module can be uniformly cooled even if the coolant temperature rises due to the heat from the battery cells toward the downstream side of the coolant flow.

According to the present invention, it is possible to achieve compactness of the battery pack by including the structure in the heat sink, and without increasing the size of the battery module so as not to require an additional cooling device, It is possible to effectively cool the heat generated from the battery cells while suppressing unevenness of the battery cell temperature. Accordingly, it is possible to provide a battery pack having an improved manufacturing process and improved cooling performance.

1A to 1C show a conventional battery module.
2 to 7 illustrate a cooling member and a battery module according to embodiments of the present invention, wherein a is a perspective view of the battery module, b is a front view, and c is a side view.
8A and 8B are cell design drawings for simulating the battery cell cooling effect according to the comparative example and the embodiments of the present invention.
9A to 9C are graphs showing the temperature distribution along the battery cell area along the refrigerant flow direction as a result of simulating battery cell cooling effect for the example shown in FIG. 8B.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. It should be noted that the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention so that various equivalents And variations are possible.

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.

FIGS. 2A to 2C illustrate a cooling member and a battery module according to an embodiment of the present invention. FIG. 2A is a perspective view of the battery module, FIG. 2B is a front view, and FIG. In FIG. 2A, the top surface is removed and shown to show the internal structure.

Referring to FIGS. 2A to 2C, the battery module according to the present invention includes a battery cell stack 120 and a cooling member 200. The battery cell stack 120 is formed by stacking the battery cells 110. The cooling member 200 includes a heat sink 130 having a hollow structure in which a flow path 140 through which refrigerant flows is formed at an upper portion and / or a lower portion of the battery cell stack 120, And the heat transfer area increases toward the downstream side of the refrigerant flow.

The battery cell 110 is preferably a plate-shaped battery cell so as to provide a high deposition rate in a limited space. The battery cell 110 is stacked so that one surface or both surfaces of the battery cell 110 are opposed to adjacent battery cells 110 to form a battery cell stack body 120 .

The battery cell 110 includes an electrode assembly composed of a positive electrode plate, a separator, and a negative electrode plate. The positive electrode lead and the negative electrode lead are electrically connected to a plurality of positive electrode tabs and negative electrode tabs protruding from the positive electrode plate and the negative electrode plate of each battery cell 110, .

As the material of the positive electrode plate, aluminum is mainly used. Alternatively, the positive electrode plate may be formed by surface-treating a surface of stainless steel, nickel, titanium or aluminum or stainless steel with carbon, nickel, titanium, silver or the like. Further, if the secondary battery is made of a material having high conductivity without causing a chemical change, there is no limitation to use it as a positive electrode plate.

A positive electrode tab may be provided on a part of the positive electrode plate, and the positive electrode tab may be formed to extend the positive electrode plate. Alternatively, it is also possible to form a configuration in which a member made of a conductive material is joined to a predetermined portion of the positive electrode plate through welding or the like. Further, the positive electrode material may be applied and dried on a part of the outer surface of the positive electrode plate to form the positive electrode tab.

The negative electrode plate corresponding to the positive electrode plate is mainly made of a copper material. Alternatively, the cathode plate may be a surface treated with carbon, nickel, titanium or silver on the surface of stainless steel, aluminum, nickel, titanium, copper or stainless steel, and aluminum-cadmium alloy or the like may be used.

The negative electrode plate may also be provided with a negative electrode tab in a certain area and may be formed to extend from the negative electrode plate as in the positive electrode tab described above. In addition, the negative electrode plate may be formed by welding a conductive member to a predetermined portion of the negative electrode plate Or it may be formed in such a manner that a negative electrode material is applied and dried on a part of the outer circumferential surface of the negative electrode plate.

The positive electrode lead is electrically connected to the positive electrode tab provided on the positive electrode plate, and the negative electrode lead is electrically connected to the negative electrode tab provided on the negative electrode plate. Preferably, the positive electrode lead and the negative electrode lead are bonded to a plurality of positive electrode tabs and a plurality of negative electrode tabs, respectively.

The positive electrode plate and the negative electrode plate are respectively coated with a positive electrode active material and a negative electrode active material. LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , LiFePO ₄ or Li _{1 + z} Ni _{1 -xy} Co _x M _y O ₂ (0? 1, 0? y? 1, 0? x + y? 1, 0? z? 1, and M is a metal such as Al, Sr, Mg, La, or Mn). The negative electrode active material is a carbonaceous active material, and examples of the negative electrode active material include a carbon material such as crystalline carbon, amorphous carbon, carbon composite, carbon fiber, lithium metal, lithium alloy and the like. The types and chemical compositions of the cathode active material and the anode active material may vary depending on the kind of the secondary battery. Therefore, it should be understood that the specific examples given above are only examples.

The separation membrane is not particularly limited as long as it has a porous material. The separation membrane may be a porous polymer membrane such as a porous polyolefin membrane, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichlorethylene, polymethyl methacrylate, polyacrylonitrile, polyvinyl Polyvinyl pyrrolidone, polyvinyl acetate, ethylene vinyl acetate copolymer, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol, cyanoethylcellulose, Polybutylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polyether ether ketone, polyether sulfone, polyether sulfone, polyether sulfone, , Poly Alkenylene may be formed of oxide, polyphenylene sulfide, polyethylene naphthalene, a non-woven film, a porous web (web) or a mixture film having a structure like. An inorganic particle may be adhered to an end surface or both surfaces of the separation membrane.

The inorganic particles are preferably inorganic particles having a high dielectric constant of 5 or more, more preferably inorganic particles having a dielectric constant of 10 or more and a low density. This is because it can easily transfer lithium ions moving in the cell. Non-limiting examples of inorganic particles having a high dielectric constant of 5 or more is _{Pb (Zr, Ti) O 3} (PZT), Pb 1 - x La x Zr 1 -y Ti y O 3 (PLZT), Pb (Mg 3 Nb _{2/3) O 3 -PbTiO 3} (PMN-PT), BaTiO 3, HfO 2, SrTiO 3, TiO 2, Al 2 O 3, ZrO 2, SnO 2, CeO 2, MgO, CaO, ZnO, Y 2 O ₃ Or a mixture thereof.

The battery cell stack 120 may have a structure in which a plurality of battery cells 110 are simply stacked with an insulating film interposed between the battery cells 110. Alternatively, the battery cell stack 120 may be formed by arranging the battery cells 110 at appropriate intervals on the upper and / or lower portions of the insulating film, then folding the insulating film together with the battery cells 110 in one direction, And the battery cell 110 may be inserted between the battery cells 110.

As another example, the battery cell stack 120 may be a pouch type battery assembly. At this time, the battery cell 110 is a pouch-shaped battery cell having a structure in which the outer circumferential surface of the battery case is thermally fused and sealed with the electrode assembly incorporated in the battery case of the laminate sheet including the resin layer and the metal layer, The outer circumferential surfaces of the battery cells may be thermally adhered to each other and fixed between the cartridges forming the battery cell stack by fixing the battery cells.

The cooling member 200 is mounted on the upper and / or lower portions of the battery cell stack 120 to remove heat generated from the battery cells 110 during charging and discharging. The heat sink 130 refers to an object that absorbs heat from other objects by thermal contact and emits heat. The heat sink 130 is a hollow structure including a flow path 140 therein. The coolant flowing in the internal flow path 140 of the heat sink 130 is not particularly limited as long as the coolant easily flows in the flow path 140 and is excellent in cooling ability, and may be a gas or a liquid. For example, the latent heat is high and can be water that can maximize cooling efficiency. However, the present invention is not limited to this, and it may be an antifreeze, gas refrigerant, air or the like as long as a flow occurs.

The cooling fin 150 is attached to a portion of the body of the heat sink 130 that is close to the battery cell stack 120, in this embodiment, the bottom surface of the heat sink 130. In this embodiment, the cooling fin 150 is a shark fin-like cooling fin gradually increasing in height along the refrigerant flow direction. The cooling fin 150 may have a length extending along the length of the battery cell 110. That is, it may have a length extending between a starting point where cooling of the battery cell 110 starts along a refrigerant flow direction and an end point where cooling ends. The maximum height of the cooling fin (150) is smaller than the height of the flow path (140). Therefore, even when the cooling fin 150 is present, the flow of the refrigerant is not disturbed. Since the heat transfer area increases with the cooling fin 150 toward the downstream side of the refrigerant flow, the amount of heat on the downstream side is larger than the amount of heat on the upstream side. As a result, the entire battery module can be uniformly cooled even when the coolant temperature rises due to the heat from the battery cell 110 as it goes down the coolant flow. The cooling fin 150 may be made of the same or similar material as the body of the heat sink 130, and may be made of a material having high thermal conductivity.

2A and 2B, the plurality of cooling fins 150 may be arranged in a predetermined interval, as shown in FIGS. 3A and 3B, They may be arranged in rows as they are installed. The example shown is a case where two sets are combined, and the number of sets may increase more if necessary.

The cooling fins 150 may be continuously formed as shown in FIGS. 2A to 2C along the refrigerant flow direction, or discontinuously as shown in FIGS. 4A to 4C. In the case where the cooling fin 150 is formed discontinuously, the refrigerant can be circulated between the cooling fins 150, and thus the unevenness of the refrigerant temperature can be alleviated to some extent.

One or more battery cell stacks 120 may be assembled to form a battery module. The battery pack may be constructed by arranging the battery module as a unit module and arranging it on the side. The heat sink 130 may have various shapes and arrangements, for example, a battery module or a battery pack unit. That is, the heat sink 130 may be detachable in units of battery modules or integrated in units of battery packs.

The cooling member 200 further includes a heat absorbing plate 160 interposed between the battery cells 110. The heat sink 130 includes a heat absorbing plate 160 and a heat absorbing plate 160 to radiate heat conducted from the heat absorbing plate 160. [ It is connected.

On the other hand, the heat absorbing plate 160 is interposed between the battery cells 110 in a state where both surfaces of the heat absorbing plate 160 closely contact the battery cells 110, and is bent to have a surface contact with the heat sink 130. That is, when the heat absorbing plate 160 is interposed between the battery cells 110, since the heat absorbing plate 160 is in surface contact with the heat sink 130, the heat radiation effect due to heat conduction can be maximized. The illustrated heat absorbing plate 160 may have a " T "shape on a vertical section, and may have an" a "shape depending on the bending direction. The heat absorbing plate 160 may be a thermally conductive metal plate. The structure of the heat absorbing plate 160 is not particularly limited as long as it is a thin, thermally conductive member. For example, a sheet-shaped metal plate material can be preferably used. The metal material may be aluminum or aluminum alloy having high thermal conductivity and light weight among metals, but is not limited thereto. For example, copper, gold, silver. Ceramic materials such as aluminum nitride and silicon carbide other than metals are also possible.

The endothermic plate 160 may have a thickness of 0.1 to 5.0 mm. The endothermic plate 160 formed of a thermally conductive metal plate material has a predetermined self-mechanical stiffness characteristic, and is a structure capable of reinforcing the mechanical rigidity of an insufficient battery cell casing itself. In addition, since the endothermic plate 160 having such a structure does not require an additional member to reinforce the mechanical rigidity, a compact battery pack can be manufactured.

The heat dissipation problem is considered as the main cause of shortening the lifetime as well as the reliability of the product. Generally, when the temperature of the product increases, it causes the following effects. The service life is shortened in a high temperature environment. The characteristics of the part vary with temperature. Organic components such as insulators cause aging at high temperatures. On the mechanical side, the temperature rise causes mechanical strength change and thermal stress. Then, a dimensional change due to thermal expansion occurs. On the personal side, it causes discomfort due to the rise in temperature and exhaust air.

If the heat dissipation between the heat absorbing plate 160 and the heat sink 130 is a problem, the heat dissipation technique of this portion may be a cause of such a temperature increase.

Generally, methods of lowering temperature are divided into thermal conductivity, heat dissipation area, convection effect, a method of increasing emissivity and a method of lowering contact thermal resistance. In the present invention, a method of lowering the contact thermal resistance to lower the temperature between the heat absorbing plate 160 and the heat sink 130 is used. The contact thermal resistance is a problem that occurs when different objects come into contact with each other, which is a factor that hinders the smooth movement of heat due to surface roughness. Thus, there is a need to improve the thermal performance of the overall system using materials that can minimize contact thermal resistance. Products to reduce contact thermal resistance are called `TIM (Thermal interface material)`. They are various kinds such as thermally conductive grease, heat radiation sheet, heat radiation pad, thermally conductive adhesive, pcm (phase change material).

In this embodiment, the heat sink 130 and the heat absorbing plate 160 may be coupled by a contact thermal resistance reducing junction. To this end, a TIM 170 is further provided between the heat sink 130 and the heat absorbing plate 160. The contact thermal resistance reduction bonding may be performed by using a thermal grease, a thermally conductive epoxy-based bond, a thermally conductive silicone pad, a thermally conductive adhesive tape, and a graphite sheet graphite sheet, and graphite sheet. The thickness of use of such TIM 170 may be 0.1 to 1 mm.

The cooling member 200 shown in FIGS. 2 to 4 includes a shark fin cooling fin 150. The cooling fin 150 is a structure in which the heat transfer area increases as the refrigerant flows toward the downstream side of the refrigerant flow. The battery module or the battery pack of the present invention can cool the battery cells 110 without temperature variation by including such a cooling fin 150.

The structure in which the heat transfer area increases toward the downstream side of the refrigerant flow may include protrusions instead of the cooling fin 150. The cooling element 200 shown in Figs. 5A-5C includes a hemispherical dome 152. Fig. The cooling element 200 of Figures 6A-6C includes a polygonal post 154. The cooling element 200 of FIGS. 7A-7C includes a square pin 156.

The cooling member 200 shown in Figs. 5 to 7 includes a plurality of protrusions 152, 154, and 156, which have a gradually increased surface area or a larger protruding dimension along the refrigerant flow direction. And is the same as the illustrated cooling member 200.

8A and 8B are cell design drawings for simulating the battery cell cooling effect according to the comparative example and the embodiments of the present invention.

A heat sink 130 is mounted in a state where the T-shaped heat absorbing plate 160 is interposed between the battery cells 110 and the heat absorbing plate 160 is in thermal contact with the upper portion of the battery cell stack 120, Is assumed. A TIM 170 is used between the heat absorbing plate 160 and the heat sink 130. 8B is an analytical shape used in an actual simulation. A unit composed of two battery cells 110 and a heat absorbing plate 160 therebetween was analyzed. The thickness of the battery cell 110 is 5 mm, the thickness of the heat absorbing plate 160 is 0.8 mm, the thickness of the TIM 170 is 0.5 mm, the thickness of the body wall of the heat sink 130 is 3 mm, and the height of the flow path 140 is 9 mm .

9A to 9C are graphs showing the temperature distribution along the battery cell area along the refrigerant flow direction as a result of simulating battery cell cooling effect for the example shown in FIG. 8B. FIG. 9A shows a case where there is nothing in the flow path 140 as shown in FIG. 8A in the comparative example. FIGS. 9B and 9C illustrate the case of the embodiment of the present invention, wherein FIG. 9B shows a shark fin cooling fin 150 as shown in FIGS. 2A to 2C, and FIG. And a semi-spherical dome 152 as shown in Fig. 5C. The closer to blue, the lower temperature state, and the closer to red the higher temperature state.

9B and 9C, in the battery module according to the present invention, the isotherm is distributed along the refrigerant flow direction in the temperature variation test, and there is no red region. That is, according to the present invention, there is no difference in cooling degree along the refrigerant flow direction, and the heat generation of the battery cell can be effectively lowered. On the other hand, FIG. 9A shows a lot of portions showing a relatively high temperature of red. It can be seen that the cooling is uneven due to the color difference along the refrigerant flow direction.

9A, the temperature difference between the cooling start points T1 and T3 and the end points T2 and T4 is large. However, according to the method of the present invention having the cooling fin 150, (2.64 ° C to> 0.72 ° C), and the maximum temperature of the battery cell is also reduced by about 4 ° C. The same effect can be obtained also in the case of FIG. 9C having the hemispherical dome 152.

As a result, the battery module of the present invention includes a structure in which the heat transfer area increases toward the downstream side of the refrigerant flow, so that the battery cells can be cooled without temperature variation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

110 ... battery cell 120 ... battery cell laminate
130 ... Heatsink 140 ... Euro
150 ... cooling fins 152, 154, 156 ... protrusions
160 ... endothermic plate 170 ... TIM

Claims (19)

A cooling member mounted on an upper portion and / or a lower portion of a battery cell stack in which battery cells are stacked to remove heat generated from the battery cells during charging and discharging,
A heat sink having a hollow structure, which is located at an upper portion and / or a lower portion of the battery cell stack body and in which a flow path for flowing a coolant is formed; And
And a heat transfer area increases in the flow path toward the downstream side of the refrigerant flow. The cooling member according to claim 1, wherein the refrigerant is a gas or a liquid. The cooling member according to claim 1, wherein the structure is mounted in a body of the heat sink close to the battery cell stack. The cooling member according to claim 1, wherein the structure is a shark fin-shaped cooling fin gradually increasing in height along the refrigerant flow direction. 5. The cooling member according to claim 4, wherein the cooling fins are arranged in rows or columns in a single row. The cooling member according to claim 4, wherein the cooling fins are formed continuously or discontinuously along the refrigerant flow direction. The cooling member according to claim 1, wherein the structure is a plurality of protrusions having a gradually increased surface area or a larger protrusion size along the refrigerant flow direction. The cooling member according to claim 7, wherein the protrusion is a hemispherical dome, a polygonal column or a square fin. The cooling member according to claim 6, wherein the protrusions are arranged in rows. The heat sink according to claim 1, wherein the cooling member further comprises a heat absorbing plate interposed between the battery cells, and the heat sink is connected to the heat absorbing plate to radiate heat conducted from the heat absorbing plate. . 11. The cooling member according to claim 10, wherein the heat absorbing plate is "a" or "T" The cooling member according to claim 10, wherein the heat absorbing plate is a thermally conductive metal plate. 11. The cooling member according to claim 10, wherein the heat sink and the heat absorbing plate are coupled with a contact thermal resistance reducing joint. 14. The method of claim 13, wherein the contact thermal resistance reducing junction is a thermally conductive grease, a thermally conductive epoxy-based bond, a thermally conductive silicone pad, a thermally conductive adhesive tape, an adhesive tape, and a graphite sheet. < Desc / Clms Page number 13 > The cooling member according to claim 1, wherein the battery cell is a plate-shaped battery cell, and one side or both sides of the battery cell are stacked so as to face adjacent battery cells, thereby forming a battery cell stack body. The pouch-shaped battery cell according to claim 15, wherein the plate-shaped battery cell is a pouch-shaped battery cell having a structure in which an outer periphery of a battery case is thermally fused and sealed with an electrode assembly embedded in a battery case of a laminate sheet including a resin layer and a metal layer, Wherein the outer circumferential surface of the pouch-shaped battery cell is thermally adhered to each other and fixed between the cartridges forming the battery cell stack by fixing the battery cells to each other. A battery module comprising a cooling member according to any one of claims 1 to 16. A battery pack according to claim 17, wherein a plurality of battery modules are arranged on the side. A device according to claim 18, characterized in that the device is any one of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device including the battery pack according to claim 18.

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