JP2017228364A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of suppressing variation of heat dissipation of a battery cell.SOLUTION: A battery pack 1 comprises: a housing 2; a battery module 3; and a plurality of heat conduction members 4 arrange between the battery module 3 and the housing 2. The battery module 3 includes: a laminate body 6 having a plurality of battery cells 9; a plurality of heat transfer surfaces 23a that is provided to each battery cell 9, and thermally connects each battery cell 9 to the housing 2; an end plate 7 that binds the laminate body 6; and an elastic member 8 that is bond with the laminate body 6. The heat conduction member 4 is arranged between each heat transfer surface 23a and the housing 2 so as to contact with each heat transfer surface 23a and the housing 2. A contact area of the heat transfer surface 23a of the plurality pf heat transfer surfaces 23a relatively existing in a region R1 close to the elastic member 8 and the heat conduction member 4 is larger than that of the heat transfer surface 23a of the plurality pf heat transfer surfaces 23a relatively existing in a region R2 far from the elastic member 8 and the heat conduction member 4.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a battery pack.

  Patent Document 1 describes a battery pack. The battery pack includes a plurality of stacked battery cells, a plurality of positioning plates disposed in contact with each stacked battery cell, and a plurality of stacked battery cells and a plurality of positioning plates that bias the stacking direction in the stacking direction. A biasing portion, a plurality of stacked battery cells, a plurality of positioning plates, and a housing for storing the biasing portion. A heat conductive sheet is disposed between the bent portion (heat radiating portion) of the positioning plate and the housing.

JP 2014-175078 A

  In the battery pack as described above, for example, an elastic member such as rubber may be used as the urging portion. In that case, the heat dissipation of the battery cell differs depending on the relative position of the battery cell with respect to the elastic member. For example, the heat dissipation of the battery cell located near the elastic member is lower than the heat dissipation of the battery cell located far from the elastic member. Therefore, there is a possibility that the temperature of the battery cell varies.

  This invention is made | formed in view of such a situation, and makes it a subject to provide the battery pack which can suppress the dispersion | variation in the heat dissipation of a battery cell.

  In order to solve the above problems, a battery pack according to the present invention includes a housing, a battery module housed in the housing, a plurality of heat conducting members disposed between the battery module and the housing, A battery module including a plurality of battery cells stacked on each other along the first direction, and a plurality of battery modules provided in each of the battery cells for thermally connecting the battery cells and the housing. A heat transfer surface, a restraining member that restrains the laminate, and an elastic member that is restrained together with the laminate by the restraining member, and the heat conduction member is in contact with each of the heat transfer surfaces and the housing. The contact area between the heat transfer surface and the heat transfer member in a region relatively close to the elastic member among the plurality of heat transfer surfaces is arranged between the heat transfer surface and the housing. Than the contact area between the heat transfer surface in the region relatively far from the elastic member and the heat transfer member Heard.

  In this battery pack, the heat conducting member is disposed between the heat transfer surface and the housing so as to come into contact with each of the heat transfer surfaces provided in the battery cell and the housing. Thereby, the heat generated in each battery cell can be radiated to the housing via the heat conducting member. In particular, in this battery pack, the contact area between the heat transfer surface in the region relatively close to the elastic member among the plurality of heat transfer surfaces and the heat transfer member is relatively to the elastic member among the plurality of heat transfer surfaces. It is larger than the contact area between the heat transfer surface in the far region and the heat conducting member. In this way, the contact area between the heat transfer surface and the heat conducting member in a region relatively close to the elastic member, which tends to have a relatively low heat dissipating property, is relatively large, thereby suppressing variation in heat dissipating properties of the battery cells. Is possible.

  In the battery pack according to the present invention, the region may include only one heat transfer surface. According to this configuration, the contact areas between the heat transfer surfaces and the heat conductive members in the respective battery cells are different from each other. Therefore, the contact area between the heat transfer surface and the heat conducting member can be made to a size suitable for the position of each battery cell, and variations in heat dissipation of the battery cells can be reliably suppressed.

  In the battery pack according to the present invention, the region may include a plurality of heat transfer surfaces. According to this configuration, the contact area between the heat transfer surface and the heat conducting member in the battery cells located in the same region is substantially the same. Therefore, the types of parts can be reduced, and the manufacturing cost can be reduced.

  In the battery pack according to the present invention, the contact area between the heat transfer surface and the heat conducting member may be defined by the size of the heat conducting member in the first direction. According to this configuration, the contact area between the heat transfer surface and the heat conductive member can be defined by the size of the heat conductive member in the first direction.

  In the battery pack according to the present invention, the contact area between the heat transfer surface and the heat conducting member may be defined by the size of the heat conducting member in the second direction intersecting the first direction. According to this configuration, the contact area between the heat transfer surface and the heat conductive member can be defined by the size of the heat conductive member in the second direction.

  The battery pack according to the present invention further includes a plurality of sliding members arranged between each of the heat conducting members and the housing, and the size of the sliding members corresponds to the size of the heat conducting members. May be. According to this configuration, for example, when the battery cell expands, the heat conducting member can slide relative to the housing in the first direction. Therefore, for example, even when the battery cell expands, the contact area between the heat transfer surface and the heat conducting member is kept constant, and it is possible to suppress variation in heat dissipation of the battery cell.

  In the battery pack according to the present invention, the restraining member restrains the laminate from both ends in the first direction of the laminate, and the elastic member is between the restraining member and the laminate on one end in the first direction of the laminate. May be arranged. Thus, even when the elastic member is disposed between the restraining member and the laminated body on the one end side in the first direction, it is possible to suppress variation in the heat dissipation of the battery cells.

  ADVANTAGE OF THE INVENTION According to this invention, the battery pack which can suppress the dispersion | variation in the heat dissipation of a battery cell is provided.

It is a perspective view which shows the battery pack which concerns on this embodiment. It is a perspective view which shows the battery module shown by FIG. FIG. 3 is an exploded perspective view of the battery unit shown in FIG. 2. FIG. 2 is a partial cross-sectional view of the battery pack shown in FIG. 1. It is a fragmentary sectional view of the battery pack concerning a modification.

  Hereinafter, an embodiment of a battery pack will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts may be denoted by the same reference numerals, and redundant description may be omitted in the description of the drawings. In the following drawings, an orthogonal coordinate system including an X axis, a Y axis, and a Z axis may be shown.

  FIG. 1 is a perspective view showing a battery pack according to the present embodiment. As shown in FIG. 1, the battery pack 1 of the present embodiment includes a box-shaped housing 2 and a plurality (for example, four) of battery modules 3. The battery module 3 is accommodated in the housing 2. The battery module 3 is fixed to the inner wall surface 2S of the housing 2 by a fixing member such as a plurality of bolts B (see FIG. 4), for example. The housing | casing 2 is formed with metals, such as iron or aluminum, for example.

  FIG. 2 is a perspective view showing the battery module. FIG. 3 is an exploded perspective view of the battery unit shown in FIG. As shown in FIGS. 2 and 3, the battery module 3 includes a stacked body 6 including a plurality of (for example, seven) battery units 5 stacked together along the first direction (X-axis direction), and the stacked body 6. A pair of end plates (restraining members) 7 disposed on both end sides in the first direction of the laminate, and an elastic member 8 disposed between the end plate 7 and the laminate 6 on one end side in the first direction of the laminate 6. And have. The battery unit 5 includes battery cells 9. That is, the stacked body 6 includes a plurality of battery cells 9 stacked on each other along the first direction. The battery unit 5 includes a cell holder 10 that holds the battery cell 9, and a heat transfer plate 11 that is disposed so as to contact the battery cell 9.

  The battery cell 9 is a lithium ion secondary battery including, for example, a rectangular parallelepiped case 12 and an electrode assembly (not shown) accommodated in the case 12. The electrode assembly includes a plurality of positive electrode sheets (not shown), a plurality of negative electrode sheets (not shown), and a separator (not shown) disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet are alternately laminated via separators.

  The case 12 includes a pair of side surfaces 12a and 12b that intersect the third direction (Y-axis direction), a pair of side surfaces 12c and 12d that intersect the first direction, and an upper surface 12e that intersects the second direction (Z-axis direction). And the lower surface 12f. The second direction is a direction intersecting the first direction, and the third direction is a direction intersecting the first direction and the second direction. A positive electrode terminal 13 and a negative electrode terminal 14 are attached to the upper surface 12 e of the case 12 via an insulating ring 15. The positive terminal 13 is electrically connected to the positive sheet, and the negative terminal 14 is electrically connected to the negative sheet.

  The cell holder 10 is a frame-shaped member made of, for example, resin. The cell holder 10 includes a bottom wall portion 16 on which the battery cell 9 is placed, a pair of side wall portions 17a and 17b that are erected from both ends of the bottom wall portion 16 and sandwich the battery cell 9 in the second direction, and a side wall portion 17a. , 17b.

  In the cell holder 10, a rectangular parallelepiped space in which the battery cells 9 are fitted is defined by the bottom wall portion 16, the side wall portions 17 a and 17 b, and the connecting portion 18. When the battery cell 9 is fitted in this space, the bottom wall portion 16 faces the lower surface 12 f of the case 12. Further, the side walls 17a and 17b face the side surfaces 12a and 12b of the case 12, respectively. Further, the connecting portion 18 faces the side surface 12 d of the case 12.

  A terminal accommodating portion 19 that surrounds a part of the positive electrode terminal 13 and the negative electrode terminal 14 of the battery cell 9 is provided at the upper part of both ends of the connecting portion 18. A bolt guide portion 20 is provided in the upper portion of the connecting portion 18 on the inner side in the second direction than the terminal accommodating portion 19. The bolt guide portion 20 is provided with a through hole 20a extending in the first direction. In addition, bolt guide portions 21 are provided at lower portions of both end portions of the bottom wall portion 16. The bolt guide portion 21 is provided with a through hole 21a extending in the first direction. A shaft portion of a bolt 24 described later is inserted through each of the through hole 20a and the through hole 21a.

  The heat transfer plate 11 includes a rectangular plate-shaped main body portion 22 and a rectangular plate-shaped extending portion 23 extending from the main body portion 22 along the first direction. The heat transfer plate 11 is formed in an L shape by the main body portion 22 and the extending portion 23. The main body 22 is in contact with the side surface 12d of the battery cell 9 (case 12). The extending portion 23 is disposed on the side surface 12 a via the side wall portion 17 a of the cell holder 10. A surface of the extending portion 23 opposite to the surface on the side surface 12 a side is thermally connected to the housing 2. Therefore, the heat transfer plate 11 thermally connects the battery cell 9 and the housing 2. That is, the surface opposite to the surface on the side surface 12 a side of the extending portion 23 is a heat transfer surface 23 a provided on each of the battery cells 9 and thermally connecting the battery cell 9 and the housing 2.

  The end plate 7 restrains the multilayer body 6 from both end sides in the first direction of the multilayer body 6. The end plate 7 is formed in an L-shaped plate shape by a rectangular plate-shaped restraining portion 7p and a rectangular plate-shaped fixing portion 7r. The restraint portion 7p is fastened to each other by fastening members such as bolts 24 and nuts 25 in a state where the laminate 6 and the elastic member 8 are sandwiched. More specifically, the bolt 24 is inserted into the through holes 20 a and 21 a of the cell holder 10 that holds the battery cell 9 and the through holes provided in the end plate 7. The nut 25 is screwed to the end of the bolt 24 so that the end plates 7 are fastened to each other. Thereby, the end plate 7 applies a restraining load to the laminate 6 and the elastic member 8. That is, the elastic member 8 is restrained by the end plate 7 together with the laminated body 6. For example, when the battery cell 9 expands, the elastic member 8 is compressed so as to absorb the expansion of the battery cell 9. The elastic member 8 is made of, for example, rubber.

  The fixing portion 7r is fastened to the housing 2 by inserting the bolt B through the insertion hole 7a in a state where the fixing portion 7r is in contact with the inner wall surface 2S of the housing 2. Thereby, the fixing part 7r fixes the battery module 3 to the housing 2.

  4 is a partial cross-sectional view of the battery pack shown in FIG. As shown in FIG. 4, the battery pack 1 further includes a plurality of heat conduction members 4 (same as the number of battery cells 9, for example, seven) arranged between the battery module 3 and the housing 2. I have. The heat conducting member 4 is disposed between the heat transfer surface 23 a and the housing 2 so as to contact the heat transfer surface 23 a of the heat transfer plate 11 and the inner wall surface 2 </ b> S of the housing 2. Further, a slip sheet (sliding member) 27 is disposed between the heat conducting member 4 and the inner wall surface 2S of the housing 2. Therefore, the heat conducting member 4 is in contact with the inner wall surface 2 </ b> S via the slip sheet 27. The heat conducting member 4 and the slip sheet 27 are arranged for each battery cell 9. Thereby, the heat generated in the battery cell 9 is radiated to the housing 2 through the heat transfer surface 23 a of the heat transfer plate 11, the heat conductive member 4, and the slip sheet 27.

  The heat conducting member 4 is formed of a material having adhesiveness such as silicon, acrylic, or urethane, for example. In addition, the heat conductive member 4 does not need to have adhesiveness, for example, may be joined to the heat-transfer plate 11 and / or the slip sheet 27 using a double-sided tape etc.

  The slip sheet 27 enables the heat conducting member 4 to move relative to the housing 2. When the heat conducting member 4 and the slip sheet 27 are joined and the slip sheet 27 is not joined to the housing 2, the heat conducting member 4 slides with the slip sheet 27 to the housing 2. On the other hand, it becomes movable. When the slip sheet 27 is joined to the housing 2 and the heat conducting member 4 is not joined to the slip sheet 27, the heat conducting member 4 slides on the slip sheet 27 to the housing 2. On the other hand, it becomes movable. The slip sheet 27 is made of a resin material having thermal conductivity such as polyethylene terephthalate (PET) and having a low friction coefficient. Note that the slip sheet 27 may contain a thermally conductive filler.

  Here, when comparing the heat conducting members 4, the size of the heat conducting member 4 in the first direction is larger as the heat conducting member 4 is closer to the elastic member 8. Further, when comparing the heat conducting members 4, the size of the heat conducting member 4 in the second direction is constant regardless of the distance to the elastic member 8. The dimensions of the heat transfer surface 23a are also constant. Accordingly, the contact area between the heat transfer surface 23a and the heat conducting member 4 in the region R1 that is relatively close to the elastic member 8 among the plurality of heat transfer surfaces 23a is relatively to the elastic member 8 among the plurality of heat transfer surfaces 23a. It is larger than the contact area between the heat transfer surface 23a in the far region R2 and the heat conducting member 4. Further, the size of the slip sheet 27 and the size of the heat conducting member 4 correspond to each other and are substantially the same size. The regions R1 and R2 are virtual regions defined for explanation, and in the present embodiment, each of the regions R1 and R2 includes only one heat transfer surface 23a.

  As described above, in the battery pack 1, the heat conducting member 4 has the heat transfer surface 23 a and the housing 2 in contact with each of the heat transfer surfaces 23 a provided in the battery cell 9 and the housing 2. It is arranged between. Thereby, the heat generated in each battery cell 9 can be radiated to the housing 2 via the heat conducting member 4. Here, in the battery cell 9 on the other side in the first direction of the stacked body 6, in addition to heat radiation to the housing 2 through the heat transfer surface 23 a and the heat conducting member 4, the housing through the end plate 7. Heat radiation to 2 is possible. On the other hand, at least one elastic member 8 is interposed between the battery cell 9 on one side in the first direction of the laminate 6 and the end plate 7. For this reason, in the battery cell 9 on the one side, it is difficult to dissipate heat to the housing 2 via the end plate 7. For this reason, the heat dissipation tends to decrease as the battery cell 9 is relatively closer to the elastic member 8.

  On the other hand, in the battery pack 1, the contact area between the heat transfer surface 23a and the heat transfer member 4 in the region R1 that is relatively close to the elastic member 8 among the plurality of heat transfer surfaces 23a is the plurality of heat transfer surfaces. The contact area between the heat transfer surface 23 a and the heat transfer member 4 in the region R <b> 2 that is relatively distant from the elastic member 8 in 23 a is larger. Thus, by relatively increasing the contact area between the heat transfer surface 23a and the heat conducting member 4 in the region R1 that is relatively close to the elastic member 8 whose heat dissipation is likely to be relatively low, It is possible to suppress variation in heat dissipation of the battery cells 9.

  In particular, in battery pack 1, each of regions R1 and R2 includes only one heat transfer surface 23a. Thereby, the contact area of the heat-transfer surface 23a and the heat conductive member 4 in each battery cell 9 mutually differs. Therefore, the contact area between the heat transfer surface 23a and the heat conducting member 4 can be made a size suitable for the position of each battery cell 9, and variation in the heat dissipation of the battery cell 9 can be reliably suppressed. It is.

  In the battery pack 1, the contact area between the heat transfer surface 23a and the heat conducting member 4 is defined by the size of the heat conducting member 4 in the first direction. Thereby, the contact area of the heat-transfer surface 23a and the heat conductive member 4 can be prescribed | regulated by the magnitude | size of the heat conductive member 4 in a 1st direction. Moreover, the dimension in the 1st direction of the battery cell 9 is smaller than the dimension of a 2nd direction. Therefore, by defining the contact area between the heat transfer surface 23a and the heat conducting member 4 by the size of the heat conducting member 4 in the first direction, the temperature variation in the battery cell 9 can be suppressed.

  The battery pack 1 further includes a plurality of slip sheets (sliding members) 27 arranged between each of the heat conducting members 4 and the housing 2, and the size of the slip sheets 27 is the heat conducting member 4. It corresponds to the size of. Thereby, for example, when the battery cell 9 expands, the heat conducting member 4 can slide relative to the housing 2 in the first direction. Therefore, for example, even when the battery cell 9 expands, the contact area between the heat transfer surface 23a and the heat conducting member 4 is kept constant, and it is possible to suppress variation in heat dissipation of the battery cell 9. .

  In the battery pack 1, the end plate (restraining member) 7 restrains the stacked body 6 from both ends in the first direction of the stacked body 6, and the elastic member 8 is on one end side of the stacked body 6 in the first direction. It is arranged between the end plate 7 and the laminate 6. By arranging the elastic member 8 in this way, when the battery cell 9 expands, the positional shift caused by the expansion of the battery cell 9 can be limited to one direction (X-axis positive direction). And according to the battery pack 1, even when the elastic member 8 is arranged between the end plate 7 and the laminated body 6 on the one end side in the first direction as described above, the variation in the heat dissipation of the battery cell 9 is reduced. It is possible to suppress.

  Next, a modification of the battery pack 1 will be described with reference to FIG. FIG. 5 is a partial cross-sectional view of a battery pack according to a modification. As shown in FIG. 5, the battery pack 100 according to this modification is different from the battery pack 1 in that the regions R1 and R2 include a plurality of heat transfer surfaces 23a. In battery pack 100, each of regions R1 and R2 includes two heat transfer surfaces 23a, and the contact area between heat transfer surface 23a and heat conductive member 4 included in the same region (regions R1 and R2). Are the same. Further, the contact area between the heat transfer surface 23a and the heat conducting member 4 in the region R1 that is relatively close to the elastic member 8 among the plurality of heat transfer surfaces 23a is relative to the elastic member 8 among the plurality of heat transfer surfaces 23a. It is larger than the contact area between the heat transfer surface 23a in the region R2 far away from the heat transfer member 4. Here, “the same” contact area between the heat transfer surface 23a and the heat conducting member included in the same region indicates that they are substantially the same. Shall be acceptable.

  Further, when the regions R1 and R2 include a plurality of heat transfer surfaces, the contact area between the heat transfer surface 23a and the heat conductive member 4 included in the same region may not be the same. In this case, the order of the size of the contact area between the heat transfer surface 23a and the heat conducting member 4 in the same region is not particularly limited. For example, each of the regions R1 and R2 includes three heat transfer surfaces 23a, and the contact area between the heat transfer surface 23a and the heat conducting member 4 included in the region R1 is sequentially increased from the side relatively closer to the elastic member 8. When the contact area between the heat transfer surface 23a and the heat conducting member 4 included in the region R2 is S21, S22, and S23 in order from the side relatively close to the elastic member 8, the contact areas are S11, S12, and S13. May be S11> S12 <S13, S21> S22 <S23. However, the contact area between the heat transfer surface 23a included in the region R1 that is relatively close to the elastic member 8 and the heat transfer member 4 is in any heat transfer surface 23a included in the region R2 that is relatively far from the elastic member 8. It shall be larger than the contact area. That is, each of the contact areas S11, S12, S13 is larger than any of the contact areas S21, S22, S23. In addition, the setting method (The position which sets an area | region, the number of the heat-transfer surfaces 23a contained in an area | region, etc.) of area | region R1, R2 is not limited to the aspect of illustration, and is arbitrary. For example, the number of heat transfer surfaces 23a included in the same region is not limited to two, and may include more heat transfer surfaces. Further, the number of heat transfer surfaces 23a included in the region R1 and the region R2 may be different from each other.

  In the battery pack 100 configured as described above, in the same manner as the battery pack 1, the contact between the heat transfer surface 23 a and the heat conducting member 4 in the region R <b> 1 relatively close to the elastic member 8 where heat dissipation tends to be relatively low. The area is relatively large. Thereby, the dispersion | variation in the heat dissipation of the battery cell 9 can be suppressed. Further, in the battery pack 100, one region R1, R2 includes a plurality of heat transfer surfaces 23a, and the heat transfer surface 23a and the heat conducting member 4 in the battery cell 9 located in the same region R1, R2 The contact area is substantially the same. Therefore, the types of components (for example, the heat conducting member 4) can be reduced, and the manufacturing cost can be reduced.

  The above embodiment describes one embodiment of the battery pack according to the present invention. Therefore, the battery pack according to the present invention is not limited to the battery packs 1 and 100 described above, and various modifications can be employed. For example, in the battery pack 1 and the battery pack 100, the heat transfer surface 11a is provided on the heat transfer plate 11, but the heat transfer surface 23a may be a side surface of the battery cell 9. In this case, the battery pack 1 and the battery pack 100 may not include the heat transfer plate 11.

  In the battery pack 1 and the battery pack 100, the contact area between the heat transfer surface 23a and the heat transfer member 4 is changed by changing the size of the heat transfer member 4 in the first direction. The contact area between the surface 23a and the heat conducting member 4 may be defined by the size of the heat conducting member 4 in the second direction. According to this configuration, the contact area between the heat transfer surface 23a and the heat conductive member 4 can be defined by the size of the heat conductive member in the second direction. Moreover, since the dimension in the 2nd direction of the battery cell 9 is larger than the dimension in a 1st direction, the contact area of the heat-transfer surface 23a and the heat conductive member 4 can be adjusted in a wide range. Note that the contact area between the heat transfer surface 23a and the heat conductive member 4 is changed by changing both the size of the heat conductive member 4 in the first direction and the size of the heat conductive member 4 in the second direction. Also good.

  Further, in the battery pack 1 and the battery pack 100, the elastic member 8 is disposed between the end plate 7 and the laminated body 6 on one end side in the first direction, but the elastic member 8 is on both end sides in the first direction. 2 may be disposed between the end plate 7 and the laminate 6. In this case, since the expansion of the battery cell 9 is absorbed by the two elastic members 8, misalignment due to the expansion of the battery cell 9 can be reduced. The elastic member 8 may be disposed not between the end plate 7 and the laminated body 6 but between the battery cells 9 (battery units 5). In any case, the contact area between the heat transfer surface 23a and the heat conducting member 4 in the region R1 that is relatively close to the elastic member 8 among the plurality of heat transfer surfaces 23a is the elastic member of the plurality of heat transfer surfaces 23a. By making the area larger than the contact area between the heat transfer surface 23a of the region R2 farther away from the heat transfer member 8 and the heat conducting member 4, it is possible to suppress variations in the heat dissipation of the battery cells 9.

  Further, in the battery pack 1 and the battery pack 100, the slip sheet 27 may be joined to the inner wall surface 2 </ b> S of the housing 2. In this case, the slip sheet 27 may not be a plurality of sheets corresponding to each of the heat conducting members 4 but may be a single sheet that can contact the plurality of heat conducting members 4 at once. Note that the battery pack 1 and the battery pack 100 may not include the slip sheet 27.

  DESCRIPTION OF SYMBOLS 1 ... Battery pack, 2 ... Housing | casing, 2S ... Inner wall surface, 3 ... Battery module, 4 ... Heat conduction member, 5 ... Battery unit, 6 ... Laminated body, 7 ... End plate (restraint member), 8 ... Elastic member, DESCRIPTION OF SYMBOLS 9 ... Battery cell, 10 ... Cell holder, 11 ... Heat-transfer plate, 12 ... Case, 13 ... Positive electrode terminal, 14 ... Negative electrode terminal, 15 ... Insulating ring, 16 ... Bottom wall part, 17a, 17b ... Side wall part, 18 ... Connection Part 19, terminal accommodating part 20, 21, bolt guide part 20 a, 21 a, through hole 22, body part 23, extension part 23 a, heat transfer surface 24, bolt 25, nut 27, Slip sheet (sliding member), 100 ... battery pack, R1, R2 ... region.

Claims (7)

A housing,
A battery module housed in the housing;
A plurality of heat conducting members disposed between the battery module and the housing;
With
The battery module is provided in each of the battery cell and a stacked body including a plurality of battery cells stacked on each other along a first direction, and thermally connects the battery cell and the housing. A plurality of heat transfer surfaces, a restraining member that restrains the laminate, and an elastic member that is restrained together with the laminate by the restraining member,
The heat conducting member is disposed between the heat transfer surface and the housing so as to contact each of the heat transfer surfaces and the housing,
Of the plurality of heat transfer surfaces, a contact area between the heat transfer surface and the heat transfer member in a region relatively close to the elastic member is a region relatively far from the elastic member among the plurality of heat transfer surfaces. A battery pack having a larger contact area between the heat transfer surface and the heat conducting member.   The battery pack according to claim 1, wherein the region includes only one heat transfer surface.   The battery pack according to claim 1, wherein the region includes a plurality of the heat transfer surfaces.   The battery pack according to any one of claims 1 to 3, wherein a contact area between the heat transfer surface and the heat conducting member is defined by a size of the heat conducting member in the first direction.   5. The contact area between the heat transfer surface and the heat conducting member is defined by the size of the heat conducting member in a second direction intersecting the first direction. Battery pack. The battery pack further includes a plurality of sliding members disposed between each of the heat conducting members and the housing,
The size of the said sliding member is a battery pack as described in any one of Claims 1-5 corresponding to the magnitude | size of the said heat conductive member. The restraining member restrains the laminate from both ends in the first direction of the laminate,
The battery pack according to any one of claims 1 to 6, wherein the elastic member is disposed between the constraining member and the laminate on one end side in the first direction of the laminate.

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