JP5751190B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack mounted on a vehicle or the like.

2. Description of the Related Art Conventionally, battery packs mounted on electric vehicles, hybrid vehicles, plug-in hybrid vehicles, etc. (hereinafter collectively referred to as EVs) that obtain the driving force of a vehicle with an electric motor are known.
The battery pack is configured, for example, by laminating a plurality of battery cells and a plurality of refrigerant channels as in Patent Document 1. The battery cells are efficiently cooled by the refrigerant flowing through the refrigerant flow path by adopting a structure in which the battery cells are sandwiched by the refrigerant flow paths from both sides in the stacking direction.

Japanese Patent No. 4510467

However, the structure of Patent Document 1 has the following problems.
That is, a battery pack mounted on an EV or the like is generally configured by stacking hundreds of battery cells in order to obtain a high voltage of several hundred volts. As a result, the number of refrigerant flow paths for cooling the battery cells is several hundreds, which increases the thickness in the stacking direction and may make it difficult to mount the battery cell in a vehicle. On the other hand, it is conceivable to reduce the thickness of each refrigerant flow path. However, in this case, fine processing and high dimensional accuracy for reducing the refrigerant flow path are required, resulting in an increase in manufacturing cost.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a battery pack that can be reduced in size and excellent in assemblability.

One aspect of the present invention is a laminate formed by laminating a plurality of battery cells and a plurality of heat transfer plates;
A cooler having a refrigerant flow path for circulating the refrigerant,
The laminate is held in a pressed state in the lamination direction,
The heat transfer plate is joined to the cooler and is configured to be able to transfer heat to the refrigerant flowing through the refrigerant flow path.
The heat transfer plate is extended in a direction orthogonal to the stacking direction from the stacked portion stacked on the battery cell toward the cooler, and connects between the stacked portion and the cooler. A connection is provided,
At least the connection part in the heat transfer plate is configured to be deformable with respect to the pressing force to the laminated body ,
The cooler has a plurality of cooling portions respectively corresponding to the heat transfer plates, the refrigerant flow path is formed inside the cooling portion, and the heat transfer plate is the heat transfer plate. The battery pack is configured to be capable of transferring heat to the refrigerant flowing through the refrigerant flow path of the cooling unit corresponding to (Claim 1).

The battery pack includes a laminate formed by laminating a plurality of battery cells and a plurality of heat transfer plates, and a cooler having a refrigerant flow path for circulating a refrigerant. That is, the battery cell and the refrigerant flow path are not stacked as in the conventional case, but the battery cell and the heat transfer plate are stacked. Here, the thickness of the heat transfer plate can be made much smaller than that of the refrigerant flow path. Therefore, it is possible to easily reduce the size of the battery pack in the stacking direction.
Each battery cell has a very small calorific value. Therefore, even if it is a structure which cools a battery cell via the heat exchanger plate which can transfer heat with respect to the refrigerant | coolant which distribute | circulates a refrigerant | coolant flow path, each battery cell can fully be cooled.

  The heat transfer plate is joined to the cooler. That is, the laminate and the cooler are connected via the heat transfer plate. Here, the heat transfer plate is provided with a connection portion that extends from the stacked portion stacked on the battery cell toward the cooler and connects the stacked portion and the cooler. Further, the heat transfer plate is configured such that at least the connection portion can be deformed with respect to the pressing force to the laminated body. Therefore, when the laminated body is pressed and held in the laminating direction, the connecting portion of the heat transfer plate having flexibility can be deformed following the laminated body and the cooler. Thereby, even if a position shift arises between a laminated body and a cooler, the position shift can be easily absorbed by the connection part of a heat exchanger plate. Therefore, the structure is excellent in assemblability.

  As described above, it is possible to reduce the size and provide a battery pack excellent in assemblability.

FIG. 3 is an explanatory diagram showing a configuration of a battery pack in Example 1. Explanatory drawing which shows the cross section of the cooling part of the cooler in Example 1. FIG. FIG. 2 is a cross-sectional explanatory view taken along line AA in FIG. 1. FIG. 3 is a cross-sectional explanatory view taken along line B-B in FIG. 1. FIG. 6 is an explanatory diagram showing a configuration of a battery pack in Example 2. FIG. 6 is an explanatory diagram showing a configuration of a battery pack in Example 3. CC sectional view explanatory drawing in FIG.

In the battery pack, the stacked body is held in a state of being pressed in the stacking direction. Here, the laminate may be pressed from one side in the stacking direction, or may be pressed from both sides in the stacking direction.
As the means for pressing and holding the laminated body, various means such as a crimping device for crimping the laminated body in the laminating direction and an elastic member such as a spring can be used (see examples described later).

Further, the laminate has a configuration in which the battery cells and the heat transfer plates are alternately stacked in order to efficiently cool the battery cells via the heat transfer plate and to reduce the size of the battery pack in the stacking direction. It is desirable to do.
Moreover, it is desirable that the battery cell is configured to be sandwiched by heat transfer plates from both sides in the stacking direction so that the battery cells can be efficiently cooled via the heat transfer plates.

Further, the heat transfer plate needs to be thermally connected to the battery cell so that the heat of the battery cell can be transmitted. In this case, the heat transfer plate may be configured to directly contact the battery cell, or may be configured to contact indirectly through another member.
The heat transfer plate is configured to transfer heat to the refrigerant flowing through the refrigerant flow path of the cooler. In this case, the heat transfer plate may be configured to directly contact the refrigerant flowing through the refrigerant flow path, or may be configured to contact indirectly through another member.

Moreover, the said connection part of the said heat exchanger plate is comprised so that deformation | transformation is possible with respect to the pressing force to a laminated body. That is, it is configured so that it can be elastically deformed or plastically deformed with respect to the pressing force applied to the laminated body.
Moreover, as a material which comprises the said connection part of the said heat exchanger plate, metal plates, such as deformable aluminum and copper, a graphite sheet etc. can be used, for example.

Further, the entire heat transfer plate may be configured to be deformable with respect to the pressing force applied to the laminated body (claim 2).
That is, since the inside of the battery cell is configured by a wound body in which the electrode is wound in dozens of layers, the thickness dimension in the stacking direction of each battery cell varies. Moreover, the thickness dimension of a battery cell may change in the state of charging / discharging in use. Therefore, some structure that absorbs the dimensional tolerance in the stacking direction of the battery cells is required.

In Patent Document 1 described above, the member that forms the refrigerant flow path is provided with flexibility to absorb the dimensional tolerance of the battery cell. However, when the member that forms the refrigerant flow path is provided with flexibility, An expensive mechanism such as a bellows is required, and there is a problem in long-term durability.
On the other hand, in the above configuration, since the entire heat transfer plate is flexible, the dimensional tolerance in the stacking direction of the battery cells can be easily absorbed by deformation of the stacked portion of the heat transfer plate against the pressing force to the stacked body. can do. Moreover, the adhesiveness of a battery cell and a heat exchanger plate can also be improved, and the heat transfer from a battery cell to a heat exchanger plate can be made favorable.

The cooler includes a plurality of cooling units corresponding to the heat transfer plates, the refrigerant flow path is formed in the cooling unit, and the heat transfer plate includes the heat transfer plate. that is configured to heat transfer relative to the refrigerant flowing through the coolant channel of the cooling section corresponding to the plate.
Therefore , by providing a cooling unit corresponding to each heat transfer plate, the battery cells can be cooled more efficiently through the heat transfer plate.

Moreover, the thickness of the said heat exchanger plate in the said lamination direction can be made smaller than the thickness of the said lamination direction of the said cooling part of the said cooler (Claim 3 ).
In this case, the physique in the stacking direction of the battery pack can be sufficiently and reliably reduced as compared with the conventional configuration in which the battery cell and the refrigerant flow path (cooling unit) are stacked. Thereby, size reduction of a battery pack can be achieved still more easily.

Moreover, the said heat exchanger plate and the said cooling part corresponding to this heat exchanger plate may be joined by brazing (Claim 4 ).
In this case, heat transfer from the heat transfer plate to the cooling unit can be made favorable. In addition, at the time of manufacturing, after joining the heat transfer plates to each cooling unit, the battery cell is arranged between the heat transfer plates, thereby facilitating the manufacture of the battery pack and reducing the manufacturing cost. it can.

In addition, between the battery cell and the heat transfer plate, it may be disposed deformably configured insulation against pressing force applied to the laminate (claim 5).
In this case, sufficient insulation between the battery cell and the heat transfer plate can be ensured. In addition, since the insulating material is deformed against the pressing force to the laminated body, the adhesion between the battery cell and the heat transfer plate can be improved, and the heat transfer from the battery cell to the heat transfer plate is good. can do.

Further, the insulating material may be adhered to the surface of the battery cell (claim 6).
In this case, when the positional deviation occurs between the battery cell and the heat transfer plate, the possibility that the insulation between the two is lost can be reduced. That is, even if a positional shift occurs between the battery cell and the heat transfer plate, sufficient insulation can be ensured between them.
In addition, the said insulating material can also be adhere | attached on the surface of a heat exchanger plate.

In addition, as the insulating material, for example, a flexible electrical insulator such as a polyimide film can be used.
Further, in order to improve heat transfer between the battery cell and the heat transfer plate, a heat conductive material such as grease is interposed between the insulating material and the battery cell or the heat transfer plate. Also good.

Example 1
Examples of the battery pack will be described with reference to the drawings.
The battery pack 1 of this example has the laminated body 2 formed by laminating | stacking the some battery cell 3 and the some heat exchanger plate 4, and the refrigerant | coolant flow path 50 which distribute | circulates a refrigerant | coolant, as shown in FIGS. And a cooler 5. The stacked body 2 is held in a state of being pressed in the stacking direction X. The heat transfer plate 4 is joined to the cooler 5 and configured to transfer heat to the refrigerant flowing through the refrigerant flow path 50.

In addition, the heat transfer plate 4 is extended in a direction orthogonal to the stacking direction X from the stacked portion 41 stacked on the battery cell 3 toward the cooler 5, and between the stacked portion 41 and the cooler 5. The connection part 42 which connects is provided. Further, at least the connection portion 42 in the heat transfer plate 4 is configured to be deformable with respect to the pressing force to the stacked body 2.
This will be described in detail below.

As shown in FIG. 1, the battery pack 1 of this example is mounted on an EV or the like that obtains driving force of a vehicle with an electric motor, and includes a laminate 2 and a cooler 5.
The stacked body 2 is configured by alternately stacking battery cells 3 and heat transfer plates 4, and each battery cell 3 is sandwiched by the heat transfer plates 4 from both sides in the stacking direction X. Moreover, the laminated body 2 is hold | maintained in the state pressed in the lamination direction X by the crimping | compression-bonding apparatus 60 mentioned later.

  As shown in the figure, the battery cell 3 has a plate-like main body 31 stacked on the heat transfer plate 4 and a pair of terminal portions 32 protruding outward from the main body 31. Inside the main body 31, a wound body (not shown) is formed by laminating and winding a sheet-like positive electrode plate and a negative electrode plate via a sheet-like separator. The wound body is connected to the terminal portion 32. Further, the pair of terminal portions 32 protrude in the height direction Z of the battery pack 1 (FIG. 4).

As shown in the figure, the heat transfer plate 4 is laminated in the height direction Z from the laminated portion 41 toward the cooler 5 with the laminated portion 41 laminated on the battery cell 3, and is cooled with the laminated portion 41. The connecting portion 42 is connected to the cooler 5, and the joint portion 43 is further extended from the connecting portion 42 in the height direction Z and joined to the cooler 5.
In addition, the heat transfer plate 4 including the connection portion 42 as a whole is configured to be deformable with respect to the pressing force to the stacked body 2. As such a heat transfer plate 4, for example, a flexible metal plate (for example, an aluminum plate having a thickness of about 0.3 mm) or the like can be used. Further, the thickness D1 of the heat transfer plate 4 in the stacking direction X is smaller than the thickness D2 of the cooling unit 51 of the cooler 5 described later in the stacking direction X.

  As shown in the figure, in the laminate 2, an insulating material 21 is disposed between the battery cell 3 and the heat transfer plate 4. The insulating material 21 is configured to be deformable with respect to the pressing force applied to the stacked body 2. As such an insulating material 21, for example, an electrical insulator such as a polyimide film having flexibility can be used. The insulating material 21 is bonded to the surface of the battery cell 3. In this example, it is bonded to the main surface 311 of the main body 31 of the battery cell 3.

As shown in the figure, the cooler 5 is arranged in a direction perpendicular to the stacking direction X with respect to the stacked body 2 (in this example, the height direction Z). The cooler 5 has a plurality of tubular cooling parts 51 corresponding to the respective heat transfer plates 4.
As shown in FIG. 2, a coolant channel 50 for circulating the coolant is formed inside the cooling unit 51. Specifically, each cooling section 51 is configured by combining a pair of flow path forming sections 511 divided in the stacking direction X, and the refrigerant flow path 50 is formed between the pair of flow path forming sections 511. Has been. In addition, the pair of flow path forming portions 511 has the joint portions 43 of the heat transfer plates 4 at both ends in the height direction Z so that the joint portions 43 of the heat transfer plates 4 are disposed in the refrigerant flow passage 50. It is pinched. Accordingly, the heat transfer plate 4 is in direct contact with the refrigerant flowing through the refrigerant flow path 50 of the cooling unit 51 and can transfer heat.

  Moreover, as shown to the figure, the heat exchanger plate 4 and the cooling part 51 corresponding to the heat exchanger plate 4 are joined by brazing. Specifically, the joining portion 43 of the heat transfer plate 4 is joined by brazing at a portion sandwiched between a pair of flow path forming portions 511 that constitute the cooling portion 51. In addition, the joint 43 of the heat transfer plate 4 is provided with metal fins 431 having a corrugated cross section. The fins 431 are provided on both sides of the joining direction 43 of the heat transfer plate 4 in the stacking direction X. Thereby, the heat transfer efficiency from the junction part 43 of the heat exchanger plate 4 to a refrigerant | coolant can be improved.

  Moreover, as shown in FIG. 1, the cooling part 51 is arrange | positioned along with the lamination direction X, providing the predetermined space | interval. Adjacent cooling parts 51 are connected by deformable tubular connecting parts 52 at both ends in the longitudinal direction of the cooling part 51 (the width direction Y of the battery pack 1). At both ends of the cooling part 51 arranged at one end in the stacking direction X, a tubular refrigerant introduction part 53 for introducing a refrigerant from the outside and a tubular refrigerant discharge part 54 (FIG. 3) for discharging the refrigerant to the outside are connected. Has been.

  As shown in FIG. 3, in the cooler 5, the refrigerant introduced from the refrigerant introduction pipe 53 appropriately passes through the connecting part 52 on the refrigerant introduction pipe 53 side and is distributed to each cooling part 51. Circulate in the direction (width direction Y). In addition, the refrigerant exchanges heat with the heat transfer plate 4 to which heat is transferred from the battery cells 3 while flowing through each cooling unit 51. In addition, the refrigerant whose temperature has increased due to heat exchange passes through the connecting part 52 on the refrigerant discharge part 54 side and is discharged from the refrigerant discharge part 54.

In each cooling part 51, the refrigerant flow paths 50 on both sides in the stacking direction X across the heat transfer plate 4 are communicated by communication holes (not shown) provided in the joint part 43 of the heat transfer plate 4. . In FIG. 3, the fins 431 are not shown.
Moreover, as a refrigerant | coolant, water, ethylene glycol aqueous solution, a chlorofluorocarbon fluid, etc. can be used, for example.

  As shown in FIG. 1, the laminate 2 is restrained in a state where it is crimped (pressed) from both sides in the laminating direction X by a crimping device 60 constituted by a crimping plate 61, bolts 62, nuts 63, and washers 64. Retained). More specifically, a pair of pressure-bonding plates 61 are arranged on both sides in the stacking direction X of the stacked body 2. Bolt holes 611 (FIG. 4) through which the bolts 62 are inserted are provided at both ends in the width direction Y of each crimping plate 61. And the laminated body 2 inserts the bolt 62 in the bolt hole 611 of a pair of crimping plate 61, and clamps with the nut 63 via the washer 64 from the one side of the lamination direction X, The lamination direction is carried out by a pair of crimping plate 61. Restrained (held) in a state of being pressed (pressed) from both sides of X.

The effect in the battery pack 1 of this example is demonstrated.
The battery pack 1 of this example includes a stacked body 5 formed by stacking a plurality of battery cells 3 and a plurality of heat transfer plates 4, and a cooler 5 having a coolant channel 50 through which a coolant flows. That is, the battery cell 3 and the refrigerant flow path 50 are not stacked as in the prior art, but the battery cell 3 and the heat transfer plate 4 are stacked. Here, the thickness of the heat transfer plate 4 can be made much smaller than that of the refrigerant flow path 50. Therefore, it is possible to easily reduce the size of the battery pack 1 in the stacking direction X.
Moreover, each battery cell 3 has a very small calorific value itself. Therefore, even if it is the structure which cools the battery cell 3 via the heat exchanger plate 4 which can transfer heat with respect to the refrigerant | coolant which distribute | circulates the refrigerant | coolant flow path 50, each battery cell 3 can fully be cooled.

  Further, the heat transfer plate 4 is joined to the cooler 5. That is, the laminate 2 and the cooler 5 are connected via the heat transfer plate 4. Here, the heat transfer plate 4 includes a connection portion 42 that extends from the stacked portion 41 stacked on the battery cell 3 toward the cooler 5 and connects between the stacked portion 41 and the cooler 5. Is provided. Further, the heat transfer plate 4 is configured such that at least the connection portion 42 can be deformed with respect to the pressing force to the stacked body 2. Therefore, when the stacked body 2 is pressed and held in the stacking direction X, the connecting portion 42 of the heat transfer plate 4 having flexibility can be deformed following the stacked body 2 and the cooler 5. Thereby, even if a positional shift occurs between the stacked body 2 and the cooler 5, the positional shift can be easily absorbed by the connecting portion 42 of the heat transfer plate 4. Therefore, the structure is excellent in assemblability.

  Further, in this example, the entire heat transfer plate 4 is configured to be deformable with respect to the pressing force to the laminate 2. Therefore, the dimensional tolerance of the battery cell 3 in the stacking direction X can be easily absorbed by the deformation of the stacked portion 41 of the heat transfer plate 4 against the pressing force applied to the stacked body 2. Moreover, the adhesiveness of the battery cell 3 and the heat exchanger plate 4 can also be improved, and the heat transfer from the battery cell 3 to the heat exchanger plate 4 can be made favorable.

  In addition, the laminate 2 is held in a state of being pressed in the stacking direction X by the crimping device 60. Here, by using an elastic crimping plate as the crimping plate 61 in the crimping device 60 or using a spring washer as the washer 64, the crimping plate 61 and the washer 64 follow the pressing force to the laminate 2. Thus, the above-described effect of absorbing the dimensional tolerance of the battery cell 3 can be further enhanced.

  Moreover, the cooler 5 has a plurality of cooling portions 51 corresponding to the respective heat transfer plates 4, and a refrigerant flow path 50 is formed inside the cooling portion 51. The heat transfer plate 4 is configured to be able to transfer heat to the refrigerant flowing through the refrigerant flow path 50 of the cooling unit 51 corresponding to the heat transfer plate 4. That is, by providing the cooling unit 51 corresponding to each heat transfer plate 4, the battery cell 3 can be further efficiently cooled via the heat transfer plate 4.

  Further, the thickness D1 of the heat transfer plate 4 in the stacking direction X is smaller than the thickness D2 of the cooling unit 51 of the cooler 5 in the stacking direction X. Therefore, the physique in the stacking direction X of the battery pack 1 can be sufficiently and reliably reduced as compared with the conventional configuration in which the battery cell 3 and the refrigerant flow path 50 (cooling unit 51) are stacked. Thereby, size reduction of the battery pack 1 can be achieved further easily.

  Moreover, the heat-transfer plate 4 and the cooling part 51 corresponding to the heat-transfer plate 4 are joined by brazing. Therefore, heat transfer from the heat transfer plate 4 to the cooler 5 (cooling unit 51) can be made favorable. Moreover, at the time of manufacture, after joining the heat transfer plate 4 to each cooling part 51, by arrange | positioning the battery cell 3 between the heat transfer plates 4, manufacture of the battery pack 1 becomes easy and manufacturing cost is reduced. Reduction can be achieved.

  Further, between the battery cell 3 and the heat transfer plate 4, an insulating material 21 configured to be deformable with respect to the pressing force to the stacked body 2 is disposed. Therefore, sufficient insulation between the battery cell 3 and the heat transfer plate 4 can be ensured. Further, the insulating material 21 is deformed by the pressing force applied to the stacked body 2, so that the adhesion between the battery cell 3 and the heat transfer plate 4 can be improved, and the heat transfer from the battery cell 3 to the heat transfer plate 4 can be improved. Heat can be made favorable.

  The insulating material 21 is bonded to the surface of the battery cell 3 (in this example, the main surface 311 of the main body 31). Therefore, when position shift arises with the battery cell 3 and the heat exchanger plate 4, possibility that the insulation between both may be lost can be made low. That is, even if the battery cell 3 and the heat transfer plate 4 are misaligned, the insulation between them can be sufficiently secured.

  Thus, according to the present example, it is possible to reduce the size and provide the battery pack 1 having excellent assemblability.

(Example 2)
This example is an example in which the means for pressing the laminate 2 is changed as shown in FIG.
In this example, as shown in the figure, the laminate 2 and the cooler 5 are accommodated in a case 10. In addition, a pair of holding plates 65 are disposed on both sides in the stacking direction X of the stacked body 2. One holding plate 65 is in contact with the inner wall surface 100 of the case 10. Further, an elastic member 66 made of a coil spring is disposed between the other holding plate 65 and the inner wall surface 100 of the case 10. And the laminated body 2 is hold | maintained in the case 10 in the state pressed from the one side of the lamination direction X by the elastic member 66. FIG.
The other configuration is the same as that of the first embodiment, and has the same operation and effect.

(Example 3)
In this example, as shown in FIGS. 6 and 7, the configuration of the cooler 5 is changed.
In this example, as shown in the figure, the coolers 5 (the first cooler 5a and the second cooler 5b) are disposed on both sides of the stacked body 2 in the height direction Z, respectively. The refrigerant discharge part 54 of the first cooler 5 a and the refrigerant introduction part 53 of the second cooler 5 b are connected by a flow path connection part 55. Further, the coolers 5 (first cooler 5a and second cooler 5b) are arranged on both sides of the stacked body 2 in the height direction Z, whereby the terminal portions 32 of the battery cells 3 are separated from the main body portion 31 in the width direction. Projected into Y.

As shown in the figure, the heat transfer plate 4 has connection portions 42 that connect the coolers 5a and 5b on both sides of the stacked portion 41 in the height direction Z, respectively. Further, the heat transfer plate 4 has joint portions 43 that are joined to the coolers 5 a and 5 b on both sides of the stacked portion 41 in the height direction Z, respectively.
Other configurations are the same as those in the first embodiment.

In the case of this example, the cooler 5 (the 1st cooler 5a, the 2nd cooler 5b) is each arrange | positioned at the both sides of the height direction Z of the laminated body 2, By this, the battery cell via the heat exchanger plate 4 is used. 3 can be cooled more efficiently.
In addition, the same effects as those of the first embodiment are obtained.

DESCRIPTION OF SYMBOLS 1 Battery pack 2 Laminated body 3 Battery cell 4 Heat-transfer plate 41 Lamination | stacking part 42 Connection part 5 Cooler 50 Refrigerant flow path

Claims (6)

A laminate formed by laminating a plurality of battery cells and a plurality of heat transfer plates;
A cooler having a refrigerant flow path for circulating the refrigerant,
The laminate is held in a pressed state in the lamination direction,
The heat transfer plate is joined to the cooler and is configured to be able to transfer heat to the refrigerant flowing through the refrigerant flow path.
The heat transfer plate is extended in a direction orthogonal to the stacking direction from the stacked portion stacked on the battery cell toward the cooler, and connects between the stacked portion and the cooler. A connection is provided,
At least the connection part in the heat transfer plate is configured to be deformable with respect to the pressing force to the laminated body ,
The cooler has a plurality of cooling portions respectively corresponding to the heat transfer plates, the refrigerant flow path is formed inside the cooling portion, and the heat transfer plate is the heat transfer plate. The battery pack is configured to be capable of transferring heat to the refrigerant flowing through the refrigerant flow path of the cooling unit corresponding to .   The battery pack according to claim 1, wherein the entire heat transfer plate is configured to be deformable with respect to a pressing force applied to the laminated body. 3. The battery pack according to claim 1, wherein a thickness of the heat transfer plate in the stacking direction is smaller than a thickness of the cooling unit of the cooler in the stacking direction . The battery pack according to claim 1, wherein the heat transfer plate and the cooling unit corresponding to the heat transfer plate are joined by brazing . 5. The battery pack according to claim 1, wherein an insulating material configured to be deformable with respect to a pressing force to the stacked body is provided between the battery cell and the heat transfer plate. A battery pack characterized by being arranged . 6. The battery pack according to claim 5 , wherein the insulating material is bonded to the surface of the battery cell .

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