JP2017188375A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack having a simpler structure.SOLUTION: A battery pack 10 includes: a housing 16 having a cylindrical member 12 having an opening 12a and a lid part 14 covering the opening 12a; a battery module 18 housed in the housing 16 and having battery cells 30; and a heat transfer sheet 28 disposed between the battery module 18 and the lid part 14 and having elasticity. The heat transfer sheet 28 has: a heat radiation part 28a positioned between the multiple battery cells 30 and the lid part 14; and a seal part 28b which is positioned around the heat radiation part 28a and seals a space between the cylindrical member 12 and the lid part 14. Compression stress of the seal part 28b is larger than compression stress of the heat radiation part 28a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a battery pack.

  A battery pack including a battery module housed in a case and having a plurality of battery cells is known (see Patent Document 1). In this battery pack, the opening of the case is closed by the cooling plate. The joining interface between the case and the cooling plate is sealed by a sealing member. On the other hand, the battery module is connected to the cooling plate via a heat transfer sheet.

JP2013-12441A

  In the said battery pack, since it is necessary to prepare the sealing member different from a heat-transfer sheet | seat separately, the structure of a battery pack becomes complicated. Moreover, when manufacturing a battery pack, the number of processes and the kind of jigs required will increase.

  An object of one aspect of the present invention is to provide a battery pack having a simpler structure.

  A battery pack according to an aspect of the present invention is provided with a first component, a battery module housed in the first component, having a plurality of battery cells, and disposed between the battery module and the second component. A heat transfer sheet, and the heat transfer sheet is positioned between the plurality of battery cells and the second component, and is positioned around the heat dissipation portion, the first component and the heat transfer sheet A seal portion that seals between the second parts, and the compressive stress of the seal portion is greater than the compressive stress of the heat dissipation portion.

  In this battery pack, since the heat transfer sheet has both the heat radiating part and the seal part, a new member for sealing is not necessary. Therefore, the battery pack has a simpler structure.

  The first component may be a cylindrical member having an opening, and the second component may be a lid that covers the opening. In this case, the battery module may be fixed to the second component by a fastening member, and the fastening member may be positioned inside the seal portion when viewed from the thickness direction of the heat transfer sheet. When the fastening member is located outside the seal portion, if there is a gap due to the fastening member, it may be necessary to seal the gap separately. On the other hand, if the fastening member is located inside the seal portion, no further sealing is necessary.

  The first component is a housing, the second component is a heat dissipating member disposed outside the housing and fixed to the housing, and the heat transfer sheet is disposed outside the housing. May be. In this case, the battery module may be fixed to the first component by a fastening member, and the fastening member may be located inside the seal portion when viewed from the thickness direction of the heat transfer sheet. When the fastening member is located outside the seal portion, if there is a gap due to the fastening member, it may be necessary to seal the gap separately. On the other hand, if the fastening member is located inside the seal portion, no further sealing is necessary.

  At least one of the first component and the second component may have a protrusion, and the seal portion may be compressed by the protrusion.

  In this case, a seal portion is obtained regardless of the shape of the heat transfer sheet. Therefore, there is no need to change the shape of the heat transfer sheet.

  The heat transfer sheet that is not compressed may have a protrusion, and the state where the protrusion of the heat transfer sheet that is not compressed is compressed may be the seal portion.

  In this case, a seal portion is obtained regardless of the shape of the housing. Therefore, there is no need to change the shape of the housing.

  At least one of the first component and the second component has a positioning portion for positioning the second component with respect to the first component, and the positioning portion has a thickness direction of the heat transfer sheet. It may be located inside the seal portion as viewed from the top.

  When the positioning part is located outside the seal part, if there is a gap due to the positioning part, it may be necessary to seal the gap separately. On the other hand, if the positioning part is located inside the seal part, no further sealing is necessary.

  According to one aspect of the present invention, a battery pack having a simpler structure can be provided.

1 is an exploded perspective view schematically showing a battery pack according to a first embodiment. It is a top view which shows a part of battery pack of FIG. FIG. 3 is a cross-sectional view of the battery pack taken along line III-III in FIG. 2. It is a top view which shows the heat-transfer sheet | seat contained in the battery pack of FIG. It is sectional drawing which shows the example of the formation method of a seal part. It is a figure which shows a part of modification of the battery pack of FIG. It is sectional drawing which shows typically the battery pack which concerns on 2nd Embodiment. It is a top view which shows the heat-transfer sheet | seat contained in the battery pack of FIG. It is sectional drawing which shows the example of the formation method of a seal part. It is a figure which shows a part of modification of the battery pack of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted.

(First embodiment)
FIG. 1 is an exploded perspective view schematically showing the battery pack according to the first embodiment. FIG. 2 is a plan view showing a part of the battery pack of FIG. 1 and 2 show an XYZ orthogonal coordinate system. FIG. 3 is a cross-sectional view of the battery pack taken along line III-III in FIG. The battery pack 10 shown in FIGS. 1 to 3 can be used as a battery for an industrial vehicle such as a forklift.

  As shown in FIG. 1, the battery pack 10 includes a casing 16 having a cylindrical member 12 (first component) having an opening 12a and a lid 14 (second component) covering the opening 12a, and a casing. A battery module 18 accommodated in the body 16. The battery module 18 is accommodated in the cylindrical member 12. The cylindrical member 12 has, for example, four plate-like members and includes two openings 12a at both ends. The two openings 12a are covered by the two lids 14, respectively. The lid 14 is a plate-like member, for example. The lid portion 14 is fixed to the cylindrical member 12 by, for example, a plurality of fastening bolts 20. The fastening bolt 20 is inserted into a hole 22 provided around the opening 12 a of the cylindrical member 12. The hole 22 is a bottomed hole. When the hole 22 penetrates the side wall of the housing 16, a sealing material may be filled between the fastening bolt 20 and the hole 22. The housing | casing 16 is a metal member which has a rectangular parallelepiped shape, for example.

  The tubular member 12 may have a positioning pin 24 (positioning portion) for positioning the lid portion 14 with respect to the tubular member 12. In this case, as shown in FIG. 2, the lid portion 14 has a hole portion 26 corresponding to the positioning pin 24. The hole 26 is a bottomed hole. The positioning pin 24 may be integrated with the main body of the cylindrical member 12 or may be separate. Instead of the positioning pins 24, other positioning portions may be used. The lid 14 may have a positioning pin, and the tubular member 12 may have a hole corresponding to the positioning pin of the lid 14.

  As shown in FIGS. 2 and 3, the battery module 18 is fixed to the lid portion 14. In the present embodiment, a plurality of battery modules 18 are fixed to the lid portion 14. The battery module 18 includes a plurality of battery cells 30. The plurality of battery cells 30 are arranged along the Y-axis direction and are arranged between the pair of end plates 32 and 32. The plurality of battery cells 30 are constrained by end plates 32 and 32. The end plates 32 and 32 may have a bracket part. In this case, the battery module 18 is fixed to the lid portion 14 by fastening bolts 34 (fastening members) via the bracket portions of the end plates 32 and 32. The lid portion 14 is provided with a hole portion 14 a corresponding to the fastening bolt 34. The hole 14a is a bottomed hole. Brackets that are separate from the end plates 32 and 32 may be used.

  The battery cell 30 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The battery cell 30 includes, for example, a hollow case having a substantially rectangular parallelepiped shape and an electrode assembly housed in the case. The case is made of a metal such as aluminum. For example, an organic solvent-based or non-aqueous electrolyte is injected into the case. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode. In the electrode assembly, for example, a positive electrode is accommodated in a bag-shaped separator, and a bag-shaped separator and a negative electrode in which the positive electrode is accommodated are alternately stacked.

  Between the one end plate 32 and the battery cell 30, an elastic body that can absorb fluctuations in the Y-axis direction of the battery cell 30 may be disposed. The elastic body is a member used for the purpose of preventing the battery cell 30 and the end plate 32 from being damaged by a restraining load when the battery cell 30 is expanded. The elastic body is formed in a rectangular plate shape by, for example, urethane rubber sponge, and is disposed between the battery cell 30 and the end plate 32 on one end side in the arrangement direction. Examples of other forming materials of the elastic body include ethylene propylene diene rubber (EPDM), chloroprene rubber, and silicone rubber. Further, the elastic body is not limited to rubber, and may be a spring material or the like.

  As shown in FIGS. 2 to 4, the battery pack 10 includes a heat transfer sheet 28 that is disposed between the battery module 18 and the lid 14 and has elasticity. FIG. 4 is a plan view showing a heat transfer sheet included in the battery pack of FIG. The heat generated in the battery module 18 reaches the lid portion 14 via the heat transfer sheet 28 and is released from the lid portion 14 to the outside. The heat transfer sheet 28 is integral and made of substantially the same material (for example, resin). The heat transfer sheet 28 is also called TIM (Thermal Interface Material). The heat conductivity of the heat transfer sheet 28 is larger than the heat conductivity of air. For example, the heat conductivity of the heat transfer sheet 28 is 1 W / m · K or more.

  The heat transfer sheet 28 is located between the plurality of battery cells 30 and the lid portion 14, and the seal that is located around the heat radiation portion 28 a and seals between the tubular member 12 and the lid portion 14. Part 28b. The heat radiating portion 28 a is compressed by the fastening force of the fastening bolt 34. By the seal portion 28b, it is possible to prevent moisture, foreign matter, and the like from entering the housing 16. The compressive stress of the seal part 28b is larger than the compressive stress of the heat radiating part 28a. The heat radiation part 28a and the seal part 28b may be connected by a connection part 28p. The heat dissipation part 28a, the connecting part 28p, and the seal part 28b are integrated. The connecting portion 28p is not compressed, but may be compressed. The heat transfer sheet 28 may have an opening 28 c at the bracket portion of the end plate 32. In this case, since the heat transfer sheet 28 is not interposed between the bracket portion of the end plate 32 and the lid portion 14, the battery module 18 can be firmly fixed to the lid portion 14. The heat transfer sheet 28 may have an opening 28 d through which the positioning pin 24 can be inserted.

  As shown in FIG. 2, the seal portion 28 b surrounds the opening 12 a when viewed from the thickness direction (X-axis direction) of the heat transfer sheet 28. The opening 12 a surrounds the battery module 18. The seal portion 28b is annular. The hole portion 26 (opening portion 28d) corresponding to the positioning pin 24 is located inside the seal portion 28b (between the seal portion 28b and the opening portion 12a) when viewed from the thickness direction of the heat transfer sheet 28. The fastening bolt 20 is located outside the seal portion 28 b when viewed from the thickness direction of the heat transfer sheet 28. That is, the seal portion 28 b is located between the fastening bolt 20 and the hole portion 26 when viewed from the thickness direction of the heat transfer sheet 28. The battery module 18 is located in the opening 12a when viewed from the thickness direction (X-axis direction) of the heat transfer sheet 28. The fastening bolt 34 that fixes the battery module 18 to the lid portion 14 is located inside the seal portion 28 b when viewed from the thickness direction of the heat transfer sheet 28. The fastening bolt 34 may be located outside the seal portion 28 b when viewed from the thickness direction of the heat transfer sheet 28.

  FIG. 5 is a cross-sectional view illustrating an example of a method for forming a seal portion. As shown in FIG. 5A, the uncompressed heat transfer sheet 40 has protrusions 40p, and the state where the protrusions 40p are compressed is the seal portion 28b. As shown in FIG. 5B, the cylindrical member 12 may have the protrusion 12p, and the state where the heat transfer sheet 40 is compressed by the protrusion 12p may be the seal portion 28b. The seal portion 28b is compressed by the protrusion 12p. As shown in FIG. 5C, the lid portion 14 may have a protrusion 14p, and the state where the heat transfer sheet 40 is compressed by the protrusion 14p may be the seal portion 28b. The seal portion 28b is compressed by the protrusion 14p. The cylindrical member 12 may have the protrusion 12p, and the lid portion 14 may have the protrusion 14p. Moreover, you may use together the heat-transfer sheet 40 which has the processus | protrusion 40p in the state which is not compressed, and at least 1 of the processus | protrusion 12p and the processus | protrusion 14p.

  FIG. 6 is a diagram showing a part of a modification of the battery pack of FIG. As shown in FIG. 6A, the battery pack 10 may not include the positioning pins 24 and the corresponding hole portions 26. In this case, the opening 28d of the heat transfer sheet 28 is not necessary. As shown in FIG. 6B, the seal portion 28 b may be located inside as well as the outside of the hole portion 26 corresponding to the positioning pin 24 when viewed from the thickness direction of the heat transfer sheet 28. In this case, the seal portion 28 b surrounds the hole portion 26. The connecting portion 28p may be positioned between the seal portion 28b and the opening portion 28d. The seal portion 28 b may not be located outside the hole portion 26 but may be located only inside the hole portion 26. As shown in FIG. 6C, the fastening bolt 20 may be positioned inside the seal portion 28 b when viewed from the thickness direction of the heat transfer sheet 28. In this case, it is not necessary to fill the sealing material between the fastening bolt 20 and the hole 22.

  In the battery pack 10 of the first embodiment, since the heat transfer sheet 28 has both the heat radiating portion 28a and the seal portion 28b, a new member for sealing is not necessary. Therefore, the battery pack 10 has a simpler structure. Moreover, when manufacturing the battery pack 10, the number of processes and the kind of jigs required can be reduced. The sealing portion 28 b is formed simply by fixing the lid portion 14 to the tubular member 12 with the fastening bolt 20.

  When the compressive stress of the entire heat transfer sheet is increased in the same manner as the seal portion, the surface pressure due to the heat transfer sheet becomes too large. As a result, the housing may be deformed, or the fastening axial force necessary to fasten the battery module to the housing may become too large. In the battery pack 10, since the seal portion 28b is provided only in a specific region of the heat transfer sheet 28, such a problem can be suppressed.

  When the seal portion 28b is compressed by at least one of the protrusion 12p of the cylindrical member 12 and the protrusion 14p of the lid portion 14, the seal portion 28b is obtained regardless of the shape of the heat transfer sheet 28. Therefore, it is not necessary to change the shape of the heat transfer sheet 28. For example, a heat transfer sheet having a flat surface in an uncompressed state can be used.

  When the state where the projection 40p of the heat transfer sheet 40 which is not compressed is compressed is the seal portion 28b, the seal portion 28b is obtained regardless of the shape of the housing 16. Therefore, it is not necessary to change the shape of the housing 16.

  When the positioning pin 24 and the corresponding hole 26 are located outside the seal portion 28b when viewed from the thickness direction of the heat transfer sheet 28, if there is a gap between the positioning pin 24 and the hole 26, There may be a need to seal the gap separately. On the other hand, if the positioning pin 24 and the hole 26 are located inside the seal portion 28b, no further sealing is necessary.

  When the fastening bolt 34 and the corresponding hole portion 14a are located outside the seal portion 28b when viewed from the thickness direction of the heat transfer sheet 28, if there is a gap between the fastening bolt 34 and the hole portion 14a, There is a possibility that the gap needs to be sealed separately. On the other hand, if the fastening bolt 34 and the hole 14a are located inside the seal portion 28b, no further sealing is necessary.

(Second Embodiment)
FIG. 7 is a cross-sectional view schematically showing the battery pack according to the second embodiment. The battery pack 110 shown in FIG. 7 can be used as a battery for an industrial vehicle such as a forklift.

  As shown in FIG. 7, the battery pack 110 includes a casing 116 (first component), a battery module 18 housed in the casing 116 and having a plurality of battery cells 30, and disposed outside the casing 116. And a heat dissipation member 50 (second component) fixed to the housing 116. The heat radiating member 50 is, for example, a heat capacity member. The housing 116 has, for example, six plate members. The casing 116 may have the same configuration as the casing 16 of the battery pack 10. The heat radiating member 50 is a plate-like member, for example, and can function as an additional weight or a counterweight. The thickness of the heat radiating member 50 is larger than the thickness of the side wall of the housing 116. The heat radiating member 50 is fixed to the housing 116 by a plurality of fastening bolts 120, for example. The fastening bolt 120 is inserted into a hole 122 provided in the housing 116. The hole 122 passes through the side wall of the housing 116. A sealing material may be filled between the fastening bolt 120 and the hole 122. Each of the housing | casing 116 and the heat radiating member 50 is a metal member which has a rectangular parallelepiped shape, for example.

  The heat radiating member 50 may include positioning pins 124 (positioning portions) for positioning the heat radiating member 50 with respect to the housing 116. In this case, as shown in FIG. 7, the housing 116 has a hole 126 corresponding to the positioning pin 124. The hole 126 penetrates the side wall of the housing 116. The positioning pin 124 may be integrated with the main body of the heat radiating member 50 or may be separate. Instead of the positioning pins 124, other positioning portions may be used. The housing 116 may have a positioning pin, and the heat dissipation member 50 may have a hole corresponding to the positioning pin of the housing 116.

  As shown in FIG. 7, the battery module 18 is fixed to the housing 116. In the present embodiment, a plurality of battery modules 18 are fixed to the housing 116. Another heat transfer sheet may be disposed between the battery cell 30 of the battery module 18 and the housing 116. When the end plates 32 and 32 of the battery module 18 have bracket portions, the battery module 18 is fixed to the casing 116 by fastening bolts 34 (fastening members) via the bracket portions of the end plates 32 and 32. A hole 116 a corresponding to the fastening bolt 34 is provided in the housing 116. The hole 116 a passes through the side wall of the housing 116.

  As shown in FIGS. 7 and 8, the battery pack 110 includes a heat transfer sheet 128 disposed between the battery module 18 and the heat dissipation member 50 and having elasticity. The heat transfer sheet 128 is disposed outside the housing 116. FIG. 8 is a plan view showing a heat transfer sheet included in the battery pack of FIG. The heat generated in the battery module 18 reaches the heat radiating member 50 via the housing 116 and the heat transfer sheet 128 and is released from the heat radiating member 50 to the outside. The heat transfer sheet 128 is compressed by the fastening force of the fastening bolt 120. The heat transfer sheet 128 is integral and is made of substantially the same material (for example, resin). The heat transfer sheet 128 is also called TIM (Thermal Interface Material). The heat conductivity of the heat transfer sheet 128 is larger than the heat conductivity of air. For example, the heat conductivity of the heat transfer sheet 128 is 1 W / m · K or more.

  The heat transfer sheet 128 is disposed between the plurality of battery cells 30 and the heat radiating member 50, and the seal portion is disposed around the heat radiating portion 128 a and seals between the housing 116 and the heat radiating member 50. 128b. By the seal portion 128b, it is possible to prevent moisture, foreign matter, and the like from entering between the housing 116 and the heat dissipation member 50. As a result, it is possible to prevent moisture, foreign matter, and the like from entering the housing 116. The compressive stress of the seal part 128b is larger than the compressive stress of the heat radiating part 128a. The heat dissipating part 128a and the seal part 128b may be connected by a connecting part 128p. The heat dissipating part 128a, the connecting part 128p, and the seal part 128b are integrated. The connecting portion 128p is compressed by the housing 116 and the heat radiating member 50 similarly to the heat radiating portion 128a, but may not be compressed. The heat transfer sheet 128 may have an opening 128 d through which the positioning pin 124 can be inserted.

  As shown in FIGS. 7 and 8, the seal portion 128 b surrounds the battery module 18 when viewed from the thickness direction of the heat transfer sheet 128. The seal portion 128b is annular. The hole 126 (opening 128d) corresponding to the positioning pin 124 is located inside the seal portion 128b (between the seal portion 128b and the battery module 18) when viewed from the thickness direction of the heat transfer sheet 128. The hole 126 penetrates the side wall of the housing 116. The fastening bolt 120 is located outside the seal portion 128 b when viewed from the thickness direction of the heat transfer sheet 128. That is, the seal portion 128 b is located between the fastening bolt 120 and the hole portion 126 when viewed from the thickness direction of the heat transfer sheet 128. In addition to the outside of the hole 126, the seal portion 128b is also located on the inside. In this case, the seal portion 128b surrounds the hole portion 126. The connecting portion 128p may be positioned between the seal portion 128b and the opening portion 128d. When the housing 116 has a positioning pin and the heat dissipation member 50 has a hole corresponding to the positioning pin of the housing 116 (a hole that penetrates the heat dissipation member 50), the space between the positioning pin and the hole The gap communicates with the external space. Even in such a case, when the seal portion 128b surrounds the hole portion of the heat dissipation member 50, the space between the heat dissipation member 50 and the housing 116 can be sealed. The fastening bolt 34 that fixes the battery module 18 to the housing 116 is located inside the seal portion 128 b when viewed from the thickness direction of the heat transfer sheet 128. The fastening bolt 34 may be located outside the seal portion 128 b when viewed from the thickness direction of the heat transfer sheet 128.

  FIG. 9 is a cross-sectional view illustrating an example of a method for forming a seal portion. As shown in FIG. 9A, the uncompressed heat transfer sheet 40 has protrusions 40p, and the state where the protrusions 40p are compressed is the seal portion 128b. As shown in FIG. 9B, the heat radiation member 50 may have a protrusion 50p, and the state where the heat transfer sheet 40 is compressed by the protrusion 50p may be the seal portion 128b. The seal portion 128b is compressed by the protrusion 50p. As shown in FIG. 9C, the casing 116 may have a protrusion 116p, and the state where the heat transfer sheet 40 is compressed by the protrusion 116p may be the seal portion 128b. The seal portion 128b is compressed by the protrusion 116p. The heat dissipation member 50 may have the protrusion 50p, and the housing 116 may have the protrusion 116p. Moreover, you may use together the heat-transfer sheet 40 which has the processus | protrusion 40p in the state which is not compressed, and at least 1 of the processus | protrusion 50p and the processus | protrusion 116p.

  FIG. 10 is a diagram showing a part of a modification of the battery pack of FIG. As shown in FIG. 10A, the battery pack 110 may not include the positioning pins 124 and the corresponding hole portions 126. In this case, the opening 128d of the heat transfer sheet 128 is not necessary. As shown in FIG. 10B, the seal portion 128 b may be located only outside the hole portion 126 corresponding to the positioning pin 124 when viewed from the thickness direction of the heat transfer sheet 128. As shown in FIG. 10C, the fastening bolt 120 may be positioned inside the seal portion 128 b when viewed from the thickness direction of the heat transfer sheet 128. In this case, it is not necessary to fill the sealing material between the fastening bolt 120 and the hole 122.

  In the battery pack 110 of the second embodiment, since the heat transfer sheet 128 has both the heat radiating portion 128a and the seal portion 128b, a new member for sealing is not necessary. Therefore, the battery pack 110 has a simpler structure. Moreover, when manufacturing the battery pack 110, the number of processes and the types of necessary jigs can be reduced. The sealing portion 128 b is formed simply by fixing the heat radiating member 50 to the housing 116 with the fastening bolt 120.

  When the compressive stress of the entire heat transfer sheet is increased in the same manner as the seal portion, the surface pressure due to the heat transfer sheet becomes too large. As a result, the housing may be deformed, or the fastening axial force necessary to fasten the battery module to the housing may become too large. In the battery pack 110, since the seal portion 128b is provided only in a specific region of the heat transfer sheet 128, such a problem can be suppressed.

  When the seal portion 128b is compressed by at least one of the protrusion 50p of the heat dissipation member 50 and the protrusion 116p of the housing 116, the seal portion 128b is obtained regardless of the shape of the heat transfer sheet 128. Therefore, it is not necessary to change the shape of the heat transfer sheet 128. For example, a heat transfer sheet having a flat surface in an uncompressed state can be used.

  When the state where the protrusion 40p of the heat transfer sheet 40 which is not compressed is compressed is the seal portion 128b, the seal portion 128b is obtained regardless of the shapes of the heat dissipation member 50 and the housing 116. Therefore, it is not necessary to change the shapes of the heat dissipation member 50 and the housing 116.

  When the positioning pin 124 and the corresponding hole 126 are located outside the seal portion 128b when viewed from the thickness direction of the heat transfer sheet 128, if there is a gap between the positioning pin 124 and the hole 126, There may be a need to seal the gap separately. On the other hand, if the positioning pin 124 and the hole 126 are located inside the seal portion 128b, no further sealing is necessary.

  When the fastening bolt 34 and the corresponding hole 116a are located outside the seal portion 128b when viewed from the thickness direction of the heat transfer sheet 128, if there is a gap between the fastening bolt 34 and the hole 116a, There is a possibility that the gap needs to be sealed separately. On the other hand, if the fastening bolt 34 and the hole 116a are located inside the seal portion 128b, no further sealing is necessary.

  As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment.

  For example, the first component may be a part of a casing that is not a cylindrical member. The second component may be a part of the casing that is not the lid, or may be another member that is not the heat dissipation member.

  DESCRIPTION OF SYMBOLS 10,110 ... Battery pack, 12a ... Opening part, 12 ... Cylindrical member (1st part), 12p, 14p, 40p, 50p, 116p ... Projection, 14 ... Cover part (2nd part), 16 ... Housing | casing, DESCRIPTION OF SYMBOLS 18 ... Battery module, 24, 124 ... Positioning pin (positioning part), 28, 128 ... Heat transfer sheet, 28a, 128a ... Heat radiation part, 28b, 128b ... Seal part, 30 ... Battery cell, 34 ... Fastening bolt (fastening member) ), 50... Heat radiating member (second part), 116... Housing (first part).

Claims (8)

A first part;
A battery module housed in the first component and having a plurality of battery cells;
A heat transfer sheet disposed between the battery module and the second component and having elasticity;
With
The heat transfer sheet is positioned around the heat dissipating part and the heat dissipating part located between the plurality of battery cells and the second part, and seals between the first part and the second part. A seal portion,
The battery pack in which the compressive stress of the seal part is larger than the compressive stress of the heat dissipation part. The first part is a cylindrical member having an opening;
The battery pack according to claim 1, wherein the second component is a lid that covers the opening. The first component is a housing;
The second component is a heat dissipating member disposed outside the housing and fixed to the housing;
The battery pack according to claim 1, wherein the heat transfer sheet is disposed outside the housing. The battery module is fixed to the second component by a fastening member;
The battery pack according to claim 2, wherein the fastening member is positioned inside the seal portion when viewed from the thickness direction of the heat transfer sheet. The battery module is fixed to the first component by a fastening member;
The battery pack according to claim 3, wherein the fastening member is positioned inside the seal portion as viewed from the thickness direction of the heat transfer sheet.   The battery pack according to claim 1, wherein at least one of the first component and the second component has a protrusion, and the seal portion is compressed by the protrusion.   The heat transfer sheet that is not compressed has a protrusion, and the state where the protrusion of the heat transfer sheet that is not compressed is compressed is the seal portion. The battery pack described in 1. At least one of the first part and the second part has a positioning portion for positioning the second part with respect to the first part;
The battery pack according to any one of claims 1 to 7, wherein the positioning portion is positioned inside the seal portion as viewed from the thickness direction of the heat transfer sheet.

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