JP2013089567A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery module that prevents unevenness of temperature in battery cells.SOLUTION: A battery module 1 comprises: an assembled battery 3 that is formed by arranging a plurality of battery cells 2; and a temperature control mechanism 5 that controls the temperatures of the respective battery cells 2. The temperature control mechanism 5 has: a heat exchange member 21 that is sandwiched between each adjacent pair of the battery cells 2; and a first heating medium pipe 22a and a second heating medium pipe 22b that circulate a heating medium therefrom to a heat source mechanism 27 and back thereto and that are thermally coupled to four sections of each of the heat exchange members 21. The first heating medium pipe 22a and the second heating medium pipe 22b are disposed in such a manner that the heating medium flows in different directions in each adjacent pair of the four sections, of each heat exchange member 21, to which the first heating medium pipe 22a and the second heating medium pipe 22b are coupled.

Description

  The present invention relates to a battery module.

  Conventionally, secondary batteries are widely used as various power sources because they can be charged and used repeatedly. And in the use for which a high output voltage is requested | required, it is utilized as an assembled battery formed by arranging a plurality of battery cells. Here, in the secondary battery, since the temperature environment has a great influence on the performance and life, a battery module in which a temperature adjustment mechanism for adjusting the temperature of each battery cell is combined with an assembled battery has been proposed. (For example, Patent Document 1).

  Specifically, as shown in FIG. 5, in this battery module 51, the assembled battery 52 is configured by arranging battery cells 53 formed in a rectangular plate shape in the plate thickness direction. On the other hand, the temperature adjustment mechanism 54 includes a plate-like heat absorption plate 55 disposed between the battery cells 53 and a plurality of cooling pipes 56 that are thermally coupled to the heat absorption plate 55. Each cooling pipe 56 is formed in a substantially U shape, and is coupled to the heat absorbing plate 55 so that the straight portion thereof is parallel to the arrangement direction of the battery cells 53, and both ends of the cooling pipe 56 are cooled by a cooling mechanism. 57. Then, the cooling liquid circulates between the cooling pipe 56 and the cooling mechanism 57, whereby the cooling liquid is cooled by the cooling mechanism 57, and the heat generated in the battery cells 53 passes through the heat absorbing plate 55 and the cooling pipe 56. Then, the battery cell 53 is cooled by absorbing heat into the coolant.

JP 2009-9889 A

  By the way, the temperature of the coolant flowing through the cooling pipe 56 rises by absorbing the heat of the battery cells 53, so the temperature of the coolant is low on the upstream side of the cooling pipe 56 into which the coolant flows from the cooling mechanism 57. It becomes higher as it goes to the downstream side. Therefore, also in one heat absorption plate 55, the cooling efficiency is different between the portion where the upstream side of the cooling pipe 56 is coupled and the portion where the downstream side of the cooling pipe 56 is coupled.

  However, in the above-described conventional configuration, the cooling pipes 56 are arranged so as to form two strips in the vertical direction, and the cooling liquid flows in from the end portion disposed on the lower side of the heat absorbing plate 55 (lower side in FIG. 5). The cooling liquid flows through the cooling pipes 56 and flows out from the end portions arranged on the upper side of the heat absorbing plate 55 (upper side in FIG. 5). Therefore, in the heat absorption plate 55, the upper side is more likely to have a lower cooling efficiency than the lower side, and temperature unevenness occurs in the heat absorption plate 55. As a result, the temperature unevenness also occurs in the battery cell 53, which may lead to, for example, a decrease in the life of the battery cell 53, and there is still room for improvement in this respect. Such a problem may occur not only when the battery cell is cooled but also when it is heated.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a battery module capable of suppressing the occurrence of temperature unevenness in battery cells.

  In order to achieve the above object, the invention according to claim 1 includes an assembled battery in which a plurality of battery cells are arranged, and a temperature adjustment mechanism that adjusts the temperature of each battery cell, and the temperature adjustment mechanism. Is a battery module having a heat exchange member sandwiched between the battery cells and a plurality of heat medium pipes that are thermally coupled to the heat exchange members and in which a heat medium circulates between the heat source mechanisms. The heat medium pipes are coupled to each of the heat exchange members at at least four places, and the heat medium pipes are arranged so that the flow directions of the heat medium at the adjacent joint parts are opposite to each other. The gist is that it was established.

  According to the said structure, since the distribution direction of the heat medium which distribute | circulates a heat-medium piping is mutually opposite in an adjacent joint location, upstream part (or downstream part) of each heat-medium piping is made into a heat exchange member. ) Are not arranged next to each other, and the upstream portion (or the downstream portion) of each heat medium pipe can be prevented from being biased to a part of the heat exchange member. Thereby, it can suppress that a temperature nonuniformity arises in a heat exchange member, and can suppress that a temperature nonuniformity arises in a battery cell by extension.

In addition, the heat exchange member may be provided with joint portions of the heat medium pipe at equal intervals.
According to the said structure, since the joining location of a heat-medium piping is arrange | positioned at equal intervals in a heat exchange member, it becomes possible to suppress more that temperature nonuniformity arises in a heat exchange member and a battery cell.

  In addition, the battery cell and the heat exchange member are formed in a rectangular plate shape, and one connection portion of the heat medium pipe is provided on each long side and each short side of the heat exchange member. The medium pipe is formed by connecting one end of the long side part coupled to each of the long sides and the short side part coupled to each of the short sides, and the heat medium flows into each of the short side parts. The heat medium may flow from the long side portions.

  Here, when the heat exchange member and the battery cell are formed in a rectangular plate shape, the length from the short side to the center is longer than the length from the long side to the center. That is, the heat of the heat medium pipe arranged on the short side is less likely to be transmitted to the center of the heat exchange member than the heat of the heat medium pipe arranged on the long side. In this regard, according to the above configuration, the upstream portion of the heat medium pipe is disposed on the short side of the heat exchange member, and the downstream portion of the heat medium pipe is disposed on the long side. It becomes possible to further suppress the occurrence of temperature unevenness.

  ADVANTAGE OF THE INVENTION According to this invention, the battery module which can suppress that a temperature nonuniformity arises in a battery cell can be provided.

The perspective view which shows schematic structure of the battery module of 1st Embodiment. Sectional drawing orthogonal to the arrangement direction in the power supply module of 1st Embodiment (AA sectional drawing of FIG. 1). Sectional drawing orthogonal to the arrangement direction in the power supply module of 2nd Embodiment. The perspective view which shows schematic structure of the battery module of another example. The perspective view which shows schematic structure of the conventional battery module.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
A battery module 1 shown in FIG. 1 is used as a power source for a traveling motor mounted on an electric vehicle or a hybrid vehicle. As shown in the figure, a battery module 1 includes an assembled battery 3 in which a plurality of battery cells 2 configured as rechargeable secondary batteries are arranged, and a temperature adjustment mechanism 5 that adjusts the temperature of each battery cell 2. And.

  The battery cell 2 of the present embodiment employs a rectangular cell formed in a rectangular plate shape. And the assembled battery 3 is comprised by arranging the some battery cell 2 along the plate | board thickness direction. In the following description, the direction in which the battery cells 2 are arranged is the arrangement direction, the direction along the long side in the front view of the battery cell 2 is the width direction, and the direction along the short side of the battery cell 2 is the height direction. And

  A positive electrode terminal 11 and a negative electrode terminal 12 projecting in the same direction are provided on the side surface of each battery cell 2 on the upper side in the height direction (upper side in FIG. 1) with an interval in the width direction. Also, rectangular plate-like end plates 13 are provided at both ends of the assembled battery 3 in the arrangement direction. In addition, the assembled battery 3 is assembled | attached in the state pressurized by the battery cell 2 from the arrangement direction both sides by attaching a restraint band (not shown) to each end plate 13. FIG.

  The temperature adjustment mechanism 5 includes a plurality of heat exchange members 21 sandwiched between the battery cells 2 and the end plates 13 provided between the battery cells 2 and at both ends in the arrangement direction, and heat to the heat exchange members 21. The first heat medium pipe 22a and the second heat medium pipe 22b are coupled to each other (so that heat can be transferred). The heat exchange member 21 and the heat medium pipes 22a and 22b are made of a material having high thermal conductivity such as an aluminum alloy or carbon.

  As shown in FIGS. 1 and 2, each heat exchange member 21 is formed in a substantially rectangular plate shape that contacts the entire end surface in the arrangement direction of the battery cell 2. And the 1st heat-medium piping 22a and the 2nd heat-medium piping 22b are couple | bonded with the outer edge of each heat exchange member 21 at four places.

  In detail, the clamping part 23 clamped by the battery cell 2 or the end plate 13 in the heat exchange member 21 has substantially the same width direction length and height direction length as the battery cell 2. The sandwiching portion 23 is formed with a pair of short side protruding portions 24 protruding on both sides in the width direction and a long side protruding portion 25 protruding on the lower side in the height direction. The length in the height direction of each short side protrusion 24 is formed shorter than the length in the height direction of the sandwiching portion 23 (battery cell 2), and the short side protrusion 24 is located above the height in the sandwiching portion 23. Are formed respectively. The short-side protruding portion 24 is formed with a long-hole-like coupling hole 24a that penetrates in the arrangement direction and is long in the height direction. Further, the length in the width direction of the long side protruding portion 25 is formed to be substantially the same as the length in the width direction of the holding portion 23. The long-side protruding portion 25 is formed with two long-hole-like coupling holes 25a that penetrate in the arrangement direction and are long in the width direction with a gap in the width direction (see FIG. 2). In addition, the surface of the clamping part 23 is coat | covered with the sheet-like insulating sheet (not shown).

  The first heat medium pipe 22a coupled to the upper side in the height direction of the heat exchange member 21 is formed in a substantially U shape by bending one pipe. The first heat medium pipe 22 a extends in the arrangement direction of the battery cells 2 and is paired with a pair of short sides 31 a and 31 b arranged on both sides in the width direction of the heat exchange member 21, that is, on each short side of the heat exchange member 21. have. The cross-sectional shape of each short side part 31a, 31b is formed in an oval shape long in the height direction, and the first heat medium pipe 22a is formed by press-fitting each short side part 31a, 31b into the coupling hole 24a. Are thermally coupled to each heat exchange member 21. That is, the coupling hole 24a corresponds to a coupling portion of the first heat medium pipe 22a.

  On the other hand, the second heat medium pipe 22b engaged with the lower side in the height direction of the heat exchange member 21 connects one ends of the linear long side portions 32a and 32b made of different members to each other by the connecting portion 32c. It is formed in a substantially U shape. The long side portions 32 a and 32 b extend in the arrangement direction of the battery cells 2 and are arranged on the lower side in the height direction of the heat exchange member 21, that is, on the long side of the heat exchange member 21. The cross-sectional shape of each long side part 32a, 32b is formed in an oval shape long in the width direction, and the second heat medium pipe 22b is formed by press-fitting each long side part 32a, 32b into the coupling hole 25a. The heat exchange members 21 are thermally coupled to each other. That is, the coupling hole 25a corresponds to a coupling location of the second heat medium pipe 22b.

  Each of the heat medium pipes 22a and 22b is connected to a heat source mechanism 27 for cooling or heating a heat medium (for example, water or air) flowing through the pipe. And when a heat carrier circulates between each heat carrier piping 22a and 22b and heat source mechanism 27, between battery cell 2 and a heat carrier via heat exchange member 21 and each heat carrier piping 22a and 22b. Heat exchange is performed and the temperature of the battery cell 2 is adjusted. The heat source mechanism 27 of the present embodiment includes a cooler that cools the heat medium, a heater that heats the heat medium, and a pump (both not shown), and the heat medium is combined with the heat source mechanism 27 by the pump. The heat medium pipes 22a and 22b are forcibly circulated.

  Here, the temperature of the heat medium flowing through the heat medium pipes 22a and 22b rises by absorbing the heat of the battery cell 2 when the battery cell 2 is cooled. Is low on the upstream side of the heat medium pipes 22a and 22b, and becomes higher toward the downstream side of the heat medium pipes 22a and 22b. On the other hand, when the battery cell 2 is heated, the temperature of the heat medium decreases due to the heat absorbed by the battery cell 2, so the temperature of the heat medium is high on the upstream side of the heat medium pipes 22 a and 22 b. It becomes low as it goes to the downstream side of 22b. Therefore, also in one heat exchange member 21, the cooling efficiency or the heating efficiency is different between the part where the upstream side of the heat medium pipes 22a and 22b is coupled and the part where the downstream side of the heat medium pipes 22a and 22b are coupled. .

  In consideration of this point, each of the heat medium pipes 22a and 22b is disposed so that the flow directions of the heat medium at the adjacent joints with respect to the heat exchange member 21 are opposite to each other. In other words, in the heat exchange member 21, an upstream portion where the heat medium flows from the heat source mechanism 27 in the heat medium pipes 22a and 22b and a downstream portion where the heat medium flows into the heat source mechanism 27 in the heat medium pipes 22a and 22b are alternately arranged. Is arranged. Specifically, a short side portion 31a of the first heat medium pipe 22a and a long side portion 32b of the second heat medium pipe 22b are connected to the delivery port 27a that sends out the heat medium in the heat source mechanism 27, and in the heat source mechanism 27. A short side 31b of the first heat medium pipe 22a and a long side 32a of the second heat medium pipe 22b are connected to the recovery port 27b for recovering the heat medium.

As described above, according to the present embodiment, the following operational effects can be achieved.
(1) The first heat medium pipe 22a and the second heat medium pipe 22b are arranged adjacent to the coupling portion with respect to the heat exchange member 21 so that the flow directions of the heat medium are opposite to each other. Therefore, the upstream part (or the downstream part) of the first heat medium pipe 22a and the second heat medium pipe 22b is not arranged adjacent to the heat exchange member 21, and the heat exchange member 21 It can suppress that the upstream part (or downstream part) of each heat-medium piping 22a, 22b is biased to a part. Thereby, it can suppress that a temperature nonuniformity arises in the heat exchange member 21, and can suppress that a temperature nonuniformity arises in the battery cell 2 by extension.

  (2) Since the cross-sectional shape of each of the heat medium pipes 22a and 22b is formed in a long hole shape, for example, the heat exchange member 21 is more efficient than when the cross-sectional shape of each of the heat medium pipes 22a and 22b is formed in a round hole shape. The temperature can be adjusted.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings. The main difference between the present embodiment and the first embodiment is only the configuration of the temperature adjustment mechanism. For this reason, for convenience of explanation, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  As shown in FIG. 3, the sandwiching portion 23 of the heat exchange member 21 is formed with a pair of short side projecting portions 41 projecting from both sides in the width direction, that is, from the short side, and both sides in the height direction of the sandwiching portion 23. That is, a pair of long side protruding portions 42 protruding from the long sides are formed. That is, one coupling point of the heat medium pipes 22a and 22b is provided on each long side and each short side of the heat exchange member 21. And the joining location of heat-medium piping 22a, 22b is provided in the outer edge of the heat exchange member 21 at equal intervals.

  Specifically, the length in the height direction of each short-side protrusion 41 is formed to be shorter than the length in the height direction of the sandwiching portion 23 (battery cell 2). It is formed so as to be located at the center in the height direction. On the other hand, the length in the width direction of each long side protrusion 42 is formed shorter than the length in the width direction of the holding part 23, and each long side protrusion 42 is positioned at the center in the width direction of the holding part 23. Is formed. Each short-side protruding portion 41 is formed with a long hole-like coupling hole 41a in the height direction, and each long-side protruding portion 42 has a long-hole-like coupling hole 42a that is long in the width direction. Is formed in the center.

  The first heat medium pipe 22a is formed in a substantially U shape by connecting one ends of a linear short side portion 43a and a long side portion 43b made of different members by a connecting portion 43c. The short side portion 43 a extends in the arrangement direction and is arranged on the left side in the width direction of the heat exchange member 21, and the long side portion 43 b extends in the arrangement direction and is arranged on the upper side in the height direction of the heat exchange member 21. On the other hand, the second heat medium pipe 22b is formed in a substantially U shape by connecting one ends of a linear short side portion 44a and a long side portion 44b made of different members by a connecting portion 44c. The short side portion 44a extends in the arrangement direction and is disposed on the right side in the width direction of the heat exchange member 21, and the long side portion 44b extends in the arrangement direction and is disposed on the lower side in the height direction of the heat exchange member 21.

  And each heat medium piping 22a, 22b is arrange | positioned so that a heat medium may flow into each short side part 43a, 44a, and a heat medium may flow out from each long side part 43b, 44b. Specifically, the short side portions 43a and 44a of the heat medium pipes 22a and 22b are connected to the delivery port 27a of the heat source mechanism 27, and the long side portions 43b and 44b are connected to the recovery port 27b of the heat source mechanism 27. Is connected.

As described above, according to this embodiment, in addition to the effects (1) and (2) of the first embodiment, the following effects can be achieved.
(3) Since the coupling holes 41a and 42a, which are coupling points of the heat medium pipes 22a and 22b, are provided at equal intervals in the heat exchange member 21, it is possible to further suppress the occurrence of temperature unevenness in the heat exchange member 21 and the battery cell 2. It becomes like this.

  (4) The battery cell 2 and the heat exchange member 21 were formed in a rectangular plate shape, and one coupling point for each heat medium pipe 22a, 22b was provided on each long side and each short side of the heat exchange member 21. And while forming each heat-medium piping 22a, 22b by connecting one end of short side part 43a, 44a and long side part 43b, 44b, a heat medium flows into each short side part 43a, 44a, It arrange | positioned so that a heat medium might flow out from the long side parts 43b and 44b.

  Here, when the heat exchange member 21 is formed in a rectangular plate shape, the length from the short side to the center is longer than the length from the long side to the center. That is, the heat of the heat medium pipe arranged on the short side is less likely to be transmitted to the center of the heat exchange member 21 than the heat of the heat medium pipe arranged on the long side. In this regard, according to the above configuration, the upstream side portions of the heat medium pipes 22a and 22b are arranged in the short side protruding portion 41 of the heat exchange member 21, and the long side protruding portion 42 is downstream of the heat medium pipes 22a and 22b. Side parts are arranged. Therefore, it becomes possible to further suppress the occurrence of temperature unevenness in the heat exchange member 21 and the battery cell 2.

In addition, each said embodiment can also be implemented in the following aspects which changed this suitably.
In each of the above embodiments, the heat medium pipes 22a and 22b are formed in a substantially U shape so that the heat medium flowing from one end side in the arrangement direction is folded back and flows out from one end side in the arrangement direction again. . However, the present invention is not limited to this, and the heat medium flowing from one end side or the other end side in the arrangement direction of the heat medium pipe may flow out from the other end side or the one end side.

  For example, in the example illustrated in FIG. 4, the temperature adjustment mechanism 5 includes four heat medium pipes 22 a to 22 d arranged one by one on each long side and each short side of the heat exchange member 21, and two heat source mechanisms 27. It has. The heat medium pipes 22a to 22d are respectively formed in a straight line extending in the arrangement direction, and the flow directions of the heat medium at the adjacent coupling points are opposite to each other at both ends of the heat medium pipes 22a to 22d in the arrangement direction. It arrange | positions so that it may become direction. The heat medium pipes 22a and 22c are thermally coupled to the heat exchanging member 21 by being press-fitted into the coupling holes 41a of the short side protruding parts 41, and the heat medium pipes 22b and 22d are long side protruding parts. The heat exchange member 21 is thermally coupled by being press-fitted into the coupling hole 42 a of 42. According to this configuration, the upstream portion of the heat medium pipes 22a and 22c is coupled to the heat exchange member 21 arranged on one end side in the arrangement direction, and the heat exchange member 21 arranged on the other end side in the arrangement direction is heated. The upstream portions of the medium pipes 22b and 22d are coupled. Therefore, since the temperature of the battery cell 2 arranged on one end side in the arrangement direction and the battery cell 2 arranged on the other end side in the arrangement direction are similarly adjusted, temperature unevenness occurs between the battery cells 2. This can be suppressed.

  In each of the above embodiments, each of the heat medium pipes 22a and 22b is formed in a substantially U shape so that the flow direction of the heat medium is folded once, but not limited to this, for example, the flow direction of the heat medium is It is good also as a shape bent so that it may be folded in multiple times.

  In the above embodiments, the cross-sectional shape of each heat medium pipe 22a, 22b is formed in a long hole shape, but is not limited thereto, and may be formed in a round hole shape or a polygonal hole shape. It is good also as a shape in which many holes were formed.

  In each of the above embodiments, each heat medium pipe 22a, 22b is thermally coupled to the heat exchange member 21 by press-fitting into the coupling holes 24a, 25a, 41a, 42a. The heat medium pipes 22a and 22b may be coupled to the heat exchange member 21.

In the above embodiment, the surface of the sandwiching portion 23 is covered with the insulating sheet. However, the present invention is not limited to this, and the surface of the sandwiching portion 23 may be covered with, for example, an insulating paint or adhesive.
In the above embodiment, the heat exchange member 21 is formed in a rectangular plate shape. However, the heat exchange member 21 is not limited thereto. For example, the heat exchange member 21 may have a disk shape, and if heat exchange can be performed with the battery cell 2, Other shapes than the plate shape may be used.

In each of the above embodiments, the heat exchange member 21 may be formed with a flow path for circulating the heat medium between the heat medium pipes 22a and 22b.
In each of the above embodiments, the battery cell 2 is configured as a square cell, but is not limited thereto, and may be configured as, for example, a cylindrical cell or a laminated cell.

In each of the above embodiments, the heat source mechanism 27 is configured to be able to heat and cool the heat medium. However, the configuration is not limited thereto, and the heat source mechanism 27 may be configured to be capable of only heating or cooling.
In each of the above embodiments, the heat medium pipes 22a and 22b are coupled to the respective heat exchanging members 21 at four locations. However, the present invention is not limited to this, and the flow directions of the heat medium at adjacent coupling locations may be opposite to each other. What is necessary is just to couple | bond at 6 or more places.

  In each of the above embodiments, the present invention is applied to the battery module 1 used as a power source for a traveling motor mounted on an electric vehicle or a hybrid vehicle, but may be applied to a power source used for other purposes.

Next, technical ideas that can be understood from the above embodiments and other examples will be described below together with their effects.
(A) The battery cell and the heat exchange member are formed in a rectangular plate shape, and a cross-sectional shape of the heat medium pipe is formed in a long hole shape. According to the said structure, compared with the case where the cross-sectional shape of heat-medium piping is formed in a round hole shape, it becomes possible to adjust the temperature of a heat exchange member efficiently.

  (B) At least one of the heat medium pipes is connected to the heat source mechanism so that the heat medium flowing from one end side in the arrangement direction of the battery cells flows out from the other end side in the arrangement direction, At least another one of the heat medium pipes is arranged such that the heat medium flowing in from the other end side in the arrangement direction flows out from one end side in the arrangement direction. According to the above configuration, since the temperature of the battery cell arranged on one end side in the arrangement direction and the battery cell arranged on the other end side in the arrangement direction are similarly adjusted, there is a temperature unevenness between the battery cells. It can be suppressed.

  DESCRIPTION OF SYMBOLS 1 ... Battery module, 2 ... Battery cell, 3 ... Assembly battery, 5 ... Temperature control mechanism, 21 ... Heat exchange member, 22a-22d ... Heat-medium piping, 24, 41 ... Short side protrusion part, 24a, 25a, 41a, 42a ... coupling hole, 25, 42 ... long side protrusion, 27 ... heat source mechanism, 31a, 31b, 43a, 44a ... short side, 32a, 32b, 43b, 44b ... long side.

Claims (3)

An assembled battery in which a plurality of battery cells are arranged, and a temperature adjustment mechanism for adjusting the temperature of each battery cell,
The temperature adjusting mechanism includes a heat exchange member sandwiched between the battery cells, and a plurality of heat medium pipes that are thermally coupled to the heat exchange members and in which a heat medium circulates between the heat source mechanism. In the battery module having
Each heat exchange member is coupled with the heat medium pipe at at least four locations,
Each said heat medium piping is arrange | positioned so that the distribution | circulation direction of the said heat medium in the adjacent joint location may become reverse direction mutually. The battery module according to claim 1,
The battery module according to claim 1, wherein the heat exchange members are provided at equal intervals in the heat exchange pipe. The battery module according to claim 1 or 2,
The battery cell and the heat exchange member are formed in a rectangular plate shape, and each heat medium pipe is connected to each long side and each short side of the heat exchange member by one place,
Each of the heat medium pipes is formed by connecting one end of a long side portion coupled to each of the long sides and one end of a short side portion coupled to each of the short sides, and heat is applied to each of the short side portions. A battery module, wherein a medium flows in and a heat medium flows out from each of the long sides.

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