JP2014082047A - Battery pack refrigeration structure - Google Patents

Abstract

A cooling structure capable of efficiently cooling a single battery constituting an assembled battery is provided.
A cooling structure includes a plurality of flat unit cells 1 arranged vertically, a plurality of heat pipes 2 having a substrate 3 provided with a heat pipe portion 4, a unit cell 1 and a heat pipe 2. An exterior case 5 to be accommodated and a cooling device 6 attached to the outer surface of the upper wall 5a of the exterior case 5 are provided. The substrate 3 of the heat pipe 2 is provided so as to be in thermal contact with at least one surface of the unit cell 1 and the heat receiving unit 8 so as to project upward from the unit cell 1 in a manner connected to the heat receiving unit 8. 8 and a horizontal heat dissipating portion 9 that is perpendicular to the right angle 8. The heat pipe portion 4 is provided from the heat receiving portion 8 to the heat radiating portion 9 of the substrate 3. The heat radiating portion 9 of the substrate 3 is fixed along the inner surface of the upper wall 5a of the outer case 5, and the cooling device 6 is attached to the outer surface of the upper wall 5a of the outer case 5.
[Selection] Figure 2

Description

  The present invention relates to a cooling structure for an assembled battery.

  In this specification and claims, the top and bottom of FIG.

  In recent years, hybrid vehicles, electric vehicles, and the like have attracted attention due to environmental problems, and various secondary batteries have been developed for this purpose. Among various types of secondary batteries, lithium ion secondary batteries have high energy density, excellent sealing properties, and are maintenance-free, so they are excellent as batteries for hybrid vehicles and electric vehicles. It has not been converted. Therefore, a desired voltage and capacity are secured by connecting a plurality of small cells in series or in parallel to form a battery pack.

  Lithium ion secondary batteries vary in performance and life depending on the operating temperature, so it is necessary to use them at an appropriate temperature in order to use them efficiently over a long period of time. In this case, it is difficult to dissipate heat generated from each unit cell itself, and there is a problem that the temperature of each unit cell rises and the life is shortened.

  Therefore, for the purpose of suppressing the temperature rise of the unit cell in the assembled battery as described above, a plurality of flat unit cells and a plurality of flat plate heat pipes are alternately stacked so that both are horizontal. A cooling structure is proposed in which a heat dissipating part is provided on at least a part of the peripheral part of the flat plate heat pipe that protrudes outward from the unit cell and is brought into contact with a heat dissipating heat sink. (See Patent Document 1).

  However, recently, further improvement in cooling efficiency of the assembled battery is required.

JP 2009-140714 A

  An object of the present invention has been made in response to the above-described demand, and is to provide a cooling structure for an assembled battery that can more efficiently cool a single battery constituting the assembled battery.

  In order to achieve the above object, the present invention comprises the following aspects.

  1) A plurality of flat unit cells arranged vertically, a plurality of flat plate heat pipes having a substrate provided with a heat pipe portion, an outer case housing the unit cells and the flat plate heat pipe, and an outer case And a cooling device attached to the outer surface of the upper wall, and a flat plate in which the flat heat pipe substrate is arranged in a stacked manner together with the unit cells in a state of being in thermal contact with at least one side of the unit cell It has a heat receiving part and a horizontal heat dissipating part that is connected to the heat receiving part and protrudes upward from the unit cell and forms a right angle with the heat receiving part, and the heat pipe part operates in the hollow hydraulic fluid enclosure part By enclosing the liquid, it is provided from the heat receiving part of the substrate to the heat radiating part, the heat radiating part of the substrate is fixed along the inner surface of the upper wall of the outer case, and the cooling device is attached to the outer surface of the upper wall of the outer case. Multiple flat plate Cooling structure of the battery pack attached so as to straddle the heat radiating portion of the substrate Topaipu.

  2) The set according to 1), wherein the heat radiating portion of the substrate of the flat plate heat pipe is fixed by a pressing member disposed along the lower side of the heat radiating portion and detachably attached to the upper wall of the exterior case. Battery cooling structure.

  3) The heat dissipating part and the holding member of the flat plate heat pipe substrate have a rectangular shape with the longitudinal direction oriented in the same direction, and the outer ends of the holding member in the longitudinal direction are more outward than the both ends of the heat dissipating part in the longitudinal direction. The above-mentioned projecting part is provided with a female threaded hole formed in the projecting part, and the male screw penetrating the upper wall of the exterior case from above is screwed into the female threaded hole of the projecting part of the pressing member. ) The assembled battery cooling structure described.

  4) The assembled battery cooling device according to 3) above, wherein the pressing member and the male screw are made of synthetic resin.

  5) The flat heat pipe substrate is composed of two metal plates joined together, and the hydraulic fluid enclosing portion of the heat pipe portion of the flat heat pipe substrate bulges out at least one of the metal plates of the substrate The concave portion into which the heat radiating portion of the substrate enters is formed on the upper surface of the pressing member, and the heat radiating portion is sandwiched between the upper wall inner surface of the exterior case and the bottom surface of the concave portion of the pressing member. The assembled battery cooling structure according to any one of 2) to 4).

  6) The cooling device is a liquid cooling type, and includes a casing having a flat bottom surface and a coolant circulation part inside, and a coolant inlet pipe and a coolant outlet pipe connected to the casing. The assembled battery cooling structure according to any one of 1) to 5), wherein the casing is attached to the upper wall in a state where the lower surface of the casing is in close contact with the outer surface of the upper wall of the exterior case.

  7) A base part joined to the outer surface of the upper wall on the upper wall of the outer case, and an upper part formed integrally with the base part, deviated upward, parallel to the outer surface of the upper wall and formed with a female screw hole. A plurality of female screw members having a positioning portion are provided, an outward flange is provided at the lower end of the peripheral edge of the cooling device, and the outward flange includes an upper wall of the exterior case and an upper deflection portion of the female screw member. Is inserted into the female screw hole of the female screw member from above, and the outward flange of the cooling device is pressed against the upper wall side of the exterior case by the tip of the male screw member. Thus, the cooling structure for the assembled battery according to 6) above, wherein the cooling device is detachably attached to the upper wall of the outer case.

  8) The above-mentioned 1), in which the unit cell in which the heat receiving part of the flat heat pipe substrate is in thermal contact with both sides and the unit cell in which the heat receiving unit is in thermal contact only on one side are mixed The cooling structure of the assembled battery according to any one of ˜7).

  According to the cooling structure of 1) to 8) above, a plurality of flat cells arranged vertically, a plurality of plate heat pipes having a substrate provided with a heat pipe portion, a cell and a plate It has an exterior case that houses the heat pipe, and a cooling device attached to the outer surface of the upper wall of the exterior case, with the flat heat pipe substrate in thermal contact with at least one side of the unit cell. A heat pipe having a vertical heat receiving portion arranged in a stacked manner together with the unit cells, and a horizontal heat radiating unit provided so as to protrude upward from the unit cells and connected to the heat receiving unit, and perpendicular to the heat receiving unit. The part is provided from the heat receiving part of the substrate to the heat radiating part by enclosing the hydraulic fluid in the hollow hydraulic fluid enclosing part, and the board heat radiating part is fixed along the inner surface of the outer wall of the outer case and cooled. Device is an exterior case Since it is attached to the outer surface of the upper wall so as to straddle the heat radiation portion of the substrate of the plurality of flat plate-like heat pipes, it becomes possible to cool the unit cell efficiently as described below.

  That is, the heat receiving part that is in thermal contact with the single cell on the substrate of the flat plate heat pipe is heated by the heat generated from the single battery, and this heat is the working liquid in the working liquid sealing part of the heat receiving part of the heat pipe part. The hydraulic fluid evaporates. On the other hand, in the heat dissipating part, heat is taken away through the upper wall by the cooling device attached to the outer surface of the upper wall of the outer case, the vapor-phase working fluid in the working fluid enclosure is condensed, and the pressure in the working fluid enclosure is reduced. descend. Then, the gas-phase hydraulic fluid generated in the hydraulic fluid enclosure of the heat receiving section flows into the hydraulic fluid enclosure of the heat radiating section where the pressure has decreased, and the recondensed liquid phase hydraulic fluid enters the hydraulic fluid enclosure of the heat receiving section. Since it flows, in the heat pipe part, the flow of the gas phase hydraulic fluid and the flow of the liquid phase hydraulic fluid are generated, and the circulation of the hydraulic fluid occurs. The liquid-phase hydraulic fluid recondensed in the hydraulic fluid enclosure of the heat radiating portion takes heat away from the unit cell and evaporates even before it flows into the hydraulic fluid enclosure of the heat receiving portion. Accordingly, the entire portion of the flat heat pipe in the unit cell that is in thermal contact with the heat receiving portion of the substrate is uniformly cooled.

  According to the cooling structure of 2) above, it is possible to remove the flat plate heat pipe from the upper wall of the exterior case even when it is necessary to replace the unit cell and the flat plate heat pipe.

  According to the cooling structure of 3), the work of fixing the heat radiating portion of the substrate of the flat plate heat pipe to the inner surface of the upper wall of the exterior case and the work of removing it from the inner surface of the upper wall can be performed relatively easily.

  According to the cooling structure of 4) above, the electrical insulation between the unit cell and the outside is improved.

  According to the cooling structure of 5) above, when the heat radiating portion is fixed by the pressing member, the hydraulic fluid enclosing portion can be prevented from being crushed.

  According to the cooling structure of the above 6), it is possible to effectively cool the heat radiating portion of the substrate of the flat plate heat pipe, and as a result, the single cell can be efficiently cooled.

  According to the cooling structure of the above 7), the operation of attaching the cooling device to the outer surface of the upper wall of the exterior case and the operation of removing it from the outer surface of the upper wall can be performed relatively easily.

It is a top view which shows the whole structure of the cooling structure of the assembled battery by this invention. It is the sectional view on the AA line of FIG. It is a disassembled perspective view which shows the structure which fixes the thermal radiation part of the board | substrate of the flat heat pipe in the cooling structure of FIG. 1 to the upper wall inner surface of an exterior case. It is a BB line expanded sectional view of Drawing 1. It is a disassembled perspective view which shows the structure which attaches the cooling device in the cooling structure of FIG. 1 to the upper wall outer surface of an exterior case.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, left and right in FIGS. 1 and 2 are referred to as left and right.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  1 and 2 show the overall structure of the assembled battery cooling structure according to the present invention, and FIGS. 3 to 5 show the structure of the essential parts thereof.

  1 and 2, the cooling structure of the assembled battery is a plurality of flat cells having a plurality of single cells (1) made of lithium ion secondary batteries and a substrate (3) provided with a heat pipe portion (4). A heat pipe (2), a sealed box-shaped outer case (5) formed of, for example, stainless steel and containing the unit cell (1) and the flat plate heat pipe (2), and the upper wall of the outer case (5) ( 5a) A plurality of cooling devices (6) attached to the outer surface.

  The unit cell (1) has a flat rectangular parallelepiped shape, and is arranged in the outer case (5) so as to be laminated in the left-right direction. Although not shown in the figure, a pair of terminals are provided at the upper end of the unit cell (1) so as to protrude upward, and all the unit cells (1) are connected in series or in parallel using the terminals. As a result, the assembled battery (7) is formed.

  In this specification, the term “cuboid” includes not only a strict cuboid defined mathematically but also a shape approximated to a cuboid. Further, the unit cell (1) is not limited to a flat rectangular parallelepiped shape, and may be a flat shape.

  As shown in FIG. 1 to FIG. 3, the substrate (3) of the flat plate heat pipe (2) is composed of two aluminum plates joined together, and between adjacent cells (1) and at one end, here A vertical heat receiving part (8) disposed on the left side of the leftmost unit cell (1) and in thermal contact with the unit cell (1), and a single cell (1) at the upper end of the heat receiving unit (8) Is provided so as to protrude upward and at right angles to the heat receiving portion (8), and here, a horizontal heat radiating portion (9) extending rightward is provided. At the center of the upper end of the heat receiving part (8) in the width direction (vertical direction in FIG. 1), a vertical narrow part (11) is provided so as to protrude above the unit cell (1). The heat dissipating part (9) is provided continuously to the upper end of the narrow part (11). Although not shown, an electric insulating film is interposed between the single cell (1) and the heat receiving part (8) of the flat plate heat pipe (2) or the heat receiving part of the flat plate heat pipe (2). It is preferable that the electrical insulation coating is applied to both the left and right sides of (8) so that the cell (1) and the heat receiving portion (8) of the flat plate heat pipe (2) are in an electrically insulated state. .

  The heat pipe portion (4) of the substrate (3) of the flat plate heat pipe (2) is one hollow endless hydraulic fluid formed by expanding one of the aluminum plates of the substrate (3) outward. The hydraulic fluid is sealed in the sealed portion (12), and is provided from the heat receiving portion (8) of the substrate (3) through the narrow portion (11) to the heat radiating portion (9). Here, the hydraulic fluid enclosing part (12) is formed so as to bulge only on the lower surface side of the heat dissipating part (9), and the upper surface of the heat dissipating part (9) is a flat surface.

  For the substrate (3) of the flat plate heat pipe (2), for example, at least one of the mating surfaces of two aluminum plates is printed with an anti-bonding agent in a required pattern, and in this state, two aluminum plates It is manufactured by a so-called roll bonding method in which a working liquid sealing part (12) is formed at a time by producing a laminated board by crimping the plates and introducing fluid pressure into the non-crimped part of the laminated plate. The non-crimping part of the laminating plate includes a non-crimping part for the hydraulic fluid sealing part having a shape corresponding to the hydraulic fluid sealing part (12), and a non-crimping part for fluid pressure introduction from the non-crimping part for the hydraulic fluid sealing part to the periphery of the laminating plate. It consists of a crimping part. When fluid pressure is introduced from the non-crimping part for introducing fluid pressure to form the hydraulic fluid enclosing part (12), one end of the non-crimping part for introducing fluid pressure is connected to the hydraulic fluid enclosing part (12) and the other end is aligned. It becomes the hydraulic fluid injection | pouring part opened to the peripheral edge of the board. The hydraulic fluid injection part is sealed after the hydraulic fluid is injected.

  The substrate (3) is formed by brazing, for example, two aluminum plates having at least one aluminum plate having an outward bulging portion for forming the hydraulic fluid enclosing portion (12). Also good.

  As shown in FIGS. 3 and 4, the heat radiating portion (9) of the substrate (3) of the flat plate heat pipe (2) is in a state where the upper surface is in surface contact with the inner surface of the upper wall (5a) of the exterior case (5). Further, it is fixed by a synthetic resin pressing member (13) disposed along the lower side of the heat radiating section (9) and detachably attached to the upper wall (5a) of the outer case (5). The heat radiating portion (9) and the pressing member (13) of the substrate (3) of the flat plate heat pipe (2) have a rectangular shape with their longitudinal directions directed in the vertical direction in FIG. Protrusions (13a) projecting outward from both longitudinal ends of the heat dissipating part (9) are provided at both longitudinal ends of the pressing member (13), and female threads ( 14) is formed, and the synthetic resin male screw (16) passed from above through the through hole (15) formed in the upper wall (5a) of the outer case (5) is attached to the holding member (13). By screwing into the female screw hole (14) of the protruding part (13a), the heat radiating part (9) is detachably attached to the inner surface of the upper wall (5a) of the outer case (5) by the pressing member (13). Yes. Between the part around the through hole (15) on the upper surface of the upper wall (5a) and the head of the male screw (16), there is a packing (17) and a stainless steel washer (18), the former being the upper wall (5a ) Side. On the upper surface of the pressing member (13), a recess (19) into which the heat radiating portion (9) of the substrate (3) is inserted is formed. The upper surface of the heat radiating portion (9) of the substrate (3) is in surface contact with the inner surface of the upper wall (5a), and the bulging top surface of the hydraulic fluid enclosing portion (12) is in surface contact with the bottom surface of the recess (19). The heat radiating portion (9) is sandwiched between the inner surface of the upper wall (5a) of the outer case (5) and the bottom surface of the concave portion (19) of the pressing member (13).

  As shown in FIGS. 4 and 5, the cooling device (6) is liquid-cooled, has a flat bottom surface, and has a coolant circulation part (22) extending in the left-right direction inside, and a lower end. A casing (21) provided with an outward flange (25), and a coolant inlet pipe (23) connected to one end of the casing (21) and supplying coolant to the coolant circulation part (22). And a coolant outlet pipe (24) connected to the other end of the casing (21) and discharging the coolant from the coolant circulation part (22).

  In the coolant circulation part (22) of the cooling device (6), there are a wave crest extending in the left-right direction, a wave bottom extending in the left-right direction, and a connecting part extending in the left-right direction and connecting the wave crest and the wave bottom. Corrugated aluminum inner fins (33) are arranged. The ends of the coolant inlet pipe (23) and the coolant outlet pipe (24) on the casing (21) side are deformed in a flat shape, the tip opening is closed, and a through hole (not shown) is formed in the lower wall portion. ) Is formed. Then, an opening (not shown) is formed in the top wall of the casing (21) of the cooling device (6), and the portions around the through holes in the lower wall portions of the flat portions of both pipes (23) and (24) The top wall of the casing (21) is metal-bonded to the portion around the opening by brazing or the like.

  The cooling device (6) is arranged in the left-right direction with the lower surface of the casing (21) in close contact with the outer surface of the upper wall (5a) of the outer case (5) and the upper surface (5a) of the outer case (5). The plurality of flat plate heat pipes (2) are attached so as to straddle the heat dissipating part (9) of the substrate (3). Here, the cooling device (6) is disposed so as to straddle some of the heat radiation portions (9) of the heat radiation portions (9) of the substrate (3) of the all-plate heat pipe (2), It is attached to the outer surface of the upper wall (5a) of the outer case (5) in the following manner so that adjacent ones do not interfere with each other while being displaced in the vertical direction in FIG.

  That is, the upper wall (5a) of the outer case (5), the base part (27) joined to the outer surface of the upper wall (5a), and the base part (27) are integrally formed and offset upward, and the upper wall (5a) There are provided a plurality of stainless steel female screw members (26) which are parallel to the outer surface and have an upper deflection portion (28) in which a female screw hole (29) is formed. The outward flange (25) at the lower end of the casing (21) of the cooling device (6) is located between the upper wall (5a) of the outer case (5) and the upper deflection part (28) of the female thread member (26). A stainless steel male screw member (31) is screwed into the female screw hole (29) of the upper deflection portion (28) from above, and the outward flange (25) is a male screw member ( 31) is pressed against the upper wall (5a) side of the outer case (5) through the stainless steel pressing plate (32), so that the cooling device (6) is attached to the upper wall of the outer case (5). (5a) Removably attached to the outer surface.

  In the cooling structure described above, when the unit cell (1) is cooled, the unit cell (1) in the substrate (3) of the flat plate heat pipe (2) is thermally cooled by the heat generated from the unit cell (1). The heat receiving portion (8) in contact with the heat is heated, and this heat is transmitted to the hydraulic fluid in the hydraulic fluid enclosing portion (12) of the heat receiving portion (8) of the heat pipe portion (4) to evaporate the hydraulic fluid. On the other hand, the cooling liquid is supplied from the cooling liquid inlet pipe (23) and discharged from the cooling liquid outlet pipe (24), and the cooling liquid is inserted into the cooling liquid passage (22) of the casing (21) of the cooling device (6). Is caused to flow, the heat radiating portion (9) of the substrate (3) of the flat plate heat pipe (2) that is in thermal contact with the cooling device (6) through the upper wall (5a) of the outer case (5). ) Is deprived of heat, the vapor-phase hydraulic fluid in the hydraulic fluid enclosure (12) is condensed in the heat radiating section (9), and the pressure in the hydraulic fluid enclosure (12) is reduced. Then, the gas phase hydraulic fluid generated in the hydraulic fluid enclosure (12) of the heat receiving section (8) flows into the hydraulic fluid enclosure (12) of the heat radiating section (9) whose pressure has decreased, and the recondensed liquid phase Since the hydraulic fluid flows into the hydraulic fluid sealing portion (12) of the heat receiving portion (8) by gravity, in the heat pipe portion (4), the upward flow of the vapor phase hydraulic fluid and the downward flow of the liquid phase hydraulic fluid. Occurs and the hydraulic fluid circulates. The liquid phase hydraulic fluid condensed in the hydraulic fluid enclosure (12) of the heat radiating section (9) of the heat pipe section (4) is returned to the hydraulic fluid enclosure (12) of the heat receiving section (8). The unit cell (1) in the hydraulic fluid enclosure (12) of the part in thermal contact with the unit cell (1) in the vertical body part (5a) of the substrate (3) of the flat plate heat pipe (2) It takes heat away from it and evaporates. Therefore, the entire portion of the unit cell (1) that is in thermal contact with the flat plate heat pipe (2) is cooled uniformly.

  The assembled battery cooling structure according to the present invention is suitably used for a hybrid car including an assembled battery including a plurality of Li secondary batteries, for example.

(1): Single cell
(2): Flat heat pipe (2)
(3): Board
(4): Heat pipe section
(5): Exterior case
(5a): Upper wall
(6): Cooling device
(7): Battery pack
(8): Heat receiving part
(9): Heat radiation part
(12): Hydraulic fluid enclosure
(13): Holding member
(13a): Projection
(14): Female thread hole
(16): Male thread
(19): Recess
(21): Casing
(22): Coolant distribution section
(23): Coolant inlet pipe
(24): Coolant outlet pipe
(25): outward flange
(26): Female thread member
(27): Base
(28): Upper deflection part
(29): Female thread hole
(31): Male thread

Claims (8)

A plurality of flat unit cells arranged vertically, a plurality of flat plate heat pipes having a substrate provided with a heat pipe portion, an outer case housing the unit cells and the flat plate heat pipes, and an upper case A vertical heat receiving unit that is arranged in a stacked manner together with the unit cells in a state where the flat heat pipe substrate is in thermal contact with at least one side of the unit cells. And a horizontal heat dissipating part that is connected to the heat receiving part and protrudes upward from the unit cell, and is perpendicular to the heat receiving part, and the heat pipe part is filled with the working fluid in the hollow working liquid enclosure part. By being enclosed, it is provided from the heat receiving portion of the substrate to the heat radiating portion, and the heat radiating portion of the substrate is fixed along the inner surface of the upper wall of the outer case, and a cooling device is attached to the outer surface of the upper wall of the outer case. Flat plate Cooling structure of the battery pack attached so as to straddle the heat radiating portion of the substrate of the heat pipe. 2. The assembled battery according to claim 1, wherein the heat radiating portion of the flat heat pipe substrate is fixed by a pressing member that is disposed along the lower side of the heat radiating portion and is detachably attached to the upper wall of the exterior case. Cooling structure. The heat dissipating part and the pressing member of the flat plate heat pipe substrate have a rectangular shape with the longitudinal direction oriented in the same direction, and protrude outward from the both end parts of the heat dissipating part in the longitudinal direction. 3. A protruding portion is provided, a female screw hole is formed in the protruding portion, and a male screw penetrating the upper wall of the exterior case from above is screwed into the female screw hole of the protruding portion of the pressing member. Battery cooling structure. 4. The battery pack cooling device according to claim 3, wherein the holding member and the male screw are made of synthetic resin. The plate of the flat heat pipe is composed of two metal plates joined together, and the hydraulic fluid enclosing portion of the heat pipe portion of the flat plate of the heat pipe bulges at least one of the metal plates of the substrate 3. A recess is formed on the upper surface of the pressing member, and the heat radiating portion of the substrate is inserted, and the heat radiating portion is sandwiched between the inner surface of the upper wall of the exterior case and the bottom surface of the concave portion of the pressing member. The cooling structure of the assembled battery in any one of -4. The cooling device is a liquid cooling type, and includes a casing having a flat bottom surface and a coolant circulation part inside, and a coolant inlet pipe and a coolant outlet pipe connected to the casing. The assembled battery cooling structure according to claim 1, wherein the lower surface of the battery pack is attached to the upper wall in a state in which the lower surface of the battery is in close contact with an outer surface of the upper wall of the exterior case. A base portion joined to the outer surface of the upper wall on the upper wall of the outer case, and an upper displacement portion formed integrally with the base portion and displaced upward, parallel to the outer surface of the upper wall and formed with a female screw hole A plurality of internal thread members are provided, and an outward flange is provided at the lower end of the peripheral edge of the cooling device, and the outward flange is between the upper wall of the exterior case and the upper deflection portion of the internal thread member. The male screw member is screwed into the female screw hole of the female screw member from above, and the outward flange of the cooling device is pressed against the upper wall side of the exterior case by the tip of the male screw member. The assembled battery cooling structure according to claim 6, wherein the cooling device is detachably attached to the upper wall of the exterior case. The single cell in which the heat-receiving part of the board | substrate of the flat plate heat pipe was contacted thermally on both surfaces and the single cell in which the heat-receiving part was contacted thermally only on one side are mixed. A cooling structure for an assembled battery according to any one of the above.

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