JP6561756B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack.

  As a conventional battery pack, for example, there is a battery pack disclosed in Patent Document 1. In this conventional battery pack, a battery module is accommodated in a casing, and a heat transfer member is attached to a battery cell constituting the battery module. The heat transfer plate has a contact portion that contacts the battery cell and a bent portion that is drawn from the contact portion toward the housing and extends in the normal direction of the main surface of the contact portion. The heat transfer plate is formed of a metal material having a thermal expansion coefficient larger than that of the casing, and the state of contact with the casing changes as the temperature of the battery cell changes.

JP2015-49990A

  When a heat transfer plate is provided in a battery cell, a heat transfer member such as TIM (Thermal Interface Material) is disposed on the inner surface side of the casing, and the bent portion of the heat transfer plate and the heat transfer member are brought into contact with each other. A configuration that efficiently dissipates heat generated in the cell to the housing side may be employed. In addition, when using a battery pack in a cold district or the like, a heating member such as a seat heater is disposed on the inner surface side of the housing, and the bent portion of the heat transfer plate and the heating member are brought into contact with each other. A configuration in which the heat generated in step 1 is transferred to the battery cell side may be employed.

  However, when a heat transfer member or a heat generating member is interposed between the bent portion of the heat transfer plate and the housing, the bending of the battery module due to a reaction force from the heat transfer member or the heat generating member becomes a problem. When the battery module is bent, the bent portion of the heat transfer plate is displaced, and the heat transfer plate and the heat transfer member or the heat generating member may not come into contact with each other as intended. In order to improve the heat transfer efficiency through the heat transfer plate, a configuration in which the heat transfer plate and the heat transfer member or the heat generating member are firmly in contact with each other is important.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a battery pack that can improve heat transfer efficiency via a heat transfer plate.

  In order to solve the above-described problem, a heat transfer plate according to one aspect of the present invention is a battery pack in which a battery module having an array of a plurality of battery cells is housed in a housing, and the housing includes a heat transfer plate. A first housing member having a first inner wall surface provided with a member, and a second housing having a second inner wall surface opposed to the first inner wall surface and provided with a heat transfer member or a heating member. A heat transfer plate is provided in each battery cell of the battery module, and the heat transfer plate is in contact with one side surface in the arrangement direction of the battery cell, and one side surface in the battery cell. The battery module includes a pair of facing portions facing each other, and the battery module has a heat transfer plate in which one facing portion of the heat transfer plate is provided on the first inner wall surface of the first casing member. The second housing member is in contact with the member and the other opposing portion of the heat transfer plate is In a state in which contact with the heat transfer member or heating member provided on the second inner wall surface, is constrained by the first casing member and second casing member.

  In this battery pack, one facing portion of the heat transfer plate is in contact with the heat transfer member provided on the first inner wall surface of the first housing member, and the other facing portion of the heat transfer plate is the second facing portion. The battery module is restrained by the first casing member and the casing member in a state where the battery module is in contact with the heat transfer member or the heat generating member provided on the second inner wall surface of the casing member. Since the battery module is restrained by the first casing member and the second casing member, the occurrence of bending of the battery module due to the reaction force from the heat transfer member and the heat generating member is suppressed, so the heat transfer plate And the heat transfer member or the heat generating member can be firmly brought into contact with each other. Therefore, the heat transfer efficiency through the heat transfer plate can be improved.

  In addition, a heat transfer member is provided on the second inner wall surface of the second casing member, and one facing portion of the heat transfer plate is separated from the other side surface of the battery cell, and the other facing of the heat transfer plate is opposed. And the other side surface of the battery cell may be separated from each other. In this case, the heat generated in the battery cell can be radiated to both the first housing member side and the second housing member side via the heat transfer plate. Thereby, the thermal radiation efficiency of a battery cell is improved. In addition, the temperature distribution in the battery cell can be made uniform as compared with the case where heat is radiated to one of the first housing member side and the second housing member side. The space between the facing portion of the heat transfer plate and the battery cell can be used as a flow path for the cooling medium or the heating medium.

  Further, a heat generating member is provided on the second inner wall surface of the second casing member, and one opposing portion of the heat transfer plate is separated from one other side surface of the battery cell, and the other opposing portion of the heat transfer plate And the other side surface of the battery cell may be separated from each other. In this case, the heat generated in the battery cell can be dissipated to the first housing member via the heat transfer plate, while the heat generated in the heat generating member is transferred to the battery cell via the heat transfer plate. be able to. The space between the facing portion of the heat transfer plate and the battery cell can be used as a flow path for the cooling medium or the heating medium.

  Moreover, the heat generating member may be provided on the second inner wall surface via a heat insulating member. Thereby, the heat generated by the heat generating member can be more reliably transferred to the battery cell side.

  The first housing member has a base portion and a plate-like standing portion erected on the base portion, and one side surface and the other side surface of the erected portion are first inner wall surfaces, respectively. The second housing member has a first divided member and a second divided member that are divided into one side and the other side of the upright portion, and the first divided member stands upright. It may have a 2nd inner wall surface facing one side of an installation part, and the 2nd division member may have the 2nd inner wall surface facing the other side of a standing installation part. In this case, a large number of battery modules can be accommodated in the housing with a simple configuration, and the heat transfer efficiency via the heat transfer plate can be improved in each battery module.

  With the heat transfer plate according to one aspect of the present invention, the heat transfer efficiency through the heat transfer plate can be improved.

It is sectional drawing which shows the battery pack which concerns on 1st Embodiment of this invention. It is the schematic which shows the structure of the battery module accommodated in the housing | casing. It is sectional drawing which shows the structure of the battery cell which comprises a battery module. It is the IV-IV sectional view taken on the line in FIG. It is sectional drawing which shows the fixed state of the battery module with respect to a housing | casing. In the battery pack which concerns on 2nd Embodiment of this invention, it is sectional drawing which shows the fixed state of the battery module with respect to a housing | casing. It is sectional drawing which shows the modification of a housing | casing.

Hereinafter, preferred embodiments of a battery pack according to one aspect of the present invention will be described in detail with reference to the drawings.
[First Embodiment]

  FIG. 1 is a cross-sectional view showing a battery pack according to a first embodiment of the present invention. As shown in FIG. 1, the battery pack 1 is configured by housing a plurality of battery modules 3 in a housing 2. The number of battery modules 3 accommodated is appropriately determined according to the specifications of the battery pack 1. Although not shown, the housing 2 houses a control device such as an ECU together with the battery module 3.

  The housing | casing 2 is formed, for example with metal materials, such as iron, and has comprised the substantially rectangular parallelepiped box shape. The housing 2 includes a main body (first housing member) 4 and a lid (second housing member) 5. The main body portion 4 includes a plate-like base portion 6 and a plate-like standing portion 7 that is erected at a substantially central portion on the one surface 6 a side of the base portion 6.

  The base portion 6 is a portion that forms the bottom of the housing 2. The base part 6 is thicker than the other parts. The standing portion 7 is a portion to which the battery module 3 is fixed. In the present embodiment, one side surface (first inner wall surface) 7a and the other side surface (first inner wall surface) 7b of the standing portion 7 are fixed surfaces of the battery module 3, respectively. The battery module 3 is fixed to a plurality of stages (three stages in the present embodiment) with being sandwiched.

  A heat transfer member 43 is provided on one side surface 7 a and the other side surface 7 b of the standing portion 7 corresponding to the fixing position of the battery module 3. As the heat transfer member 43, for example, a sheet-like TIM (Thermal Interface Material) is used. TIM is a material in which a powdery ceramic filler having thermal conductivity is contained in an elastic material such as silicon rubber. The area of the heat transfer member 43 is, for example, approximately the same as the total area of the facing portions 42 (see FIG. 5) of the heat transfer plate 15 provided in each battery cell 11 in the battery module 3.

  The lid 5 includes a first divided member 8 and a second divided member 9. The first divided member 8 and the second divided member 9 are divided into one side 7a side and the other side surface 7b side of the standing portion 7. The first dividing member 8 has a side wall 8A facing the upright portion 7, a side wall 8B facing the base portion 6, and a pair of side walls (not shown) facing each other in the depth direction of FIG. Yes. The second dividing member 9 has a side wall 9A facing the upright portion 7, a side wall 9B facing the base portion 6, and a pair of side walls (not shown) facing each other in the depth direction of FIG. doing.

  The first divided member 8 and the second divided member 9 are joined to each other along a surface passing through the center of the standing portion 7 in the thickness direction, and the box-shaped lid portion 5 that opens on the base portion 6 side. Is configured. The casing 2 having an airtight housing space for the battery module 3 is formed by joining the opening end portion of the lid portion 5 on the base portion 6 side to the edge portion on the one surface 6a side of the base portion 6. In the present embodiment, the accommodation space S (S1) is formed on the side surface 7a side of the standing portion 7, and the accommodation space S (S2) is formed on the other side surface 7b side of the standing portion 7.

  The inner surface of the side wall 8 </ b> A of the first dividing member 8 is a side surface (second inner wall surface) 8 a that faces the side surface 7 a of the standing portion 7. On the side surface 8a, a heat transfer member 43 made of, for example, a sheet-like TIM is provided at a position facing the heat transfer member 43 provided on one side surface 7a of the standing portion 7. Further, the inner surface of the side wall 9 </ b> A of the second divided member 9 is a side surface (second inner wall surface) 9 a facing the other side surface 7 b of the standing portion 7. A heat transfer member 43 made of, for example, a sheet-like TIM is provided on the side surface 9 a at a position facing the heat transfer member 43 provided on the other side surface 7 b of the standing portion 7.

  As shown in FIG. 2, the battery module 3 includes an array 12 of a plurality of battery cells 11, a restraining member 13 that applies a restraining load to the array 12 in the array direction of the battery cells 11, And an elastic body 14 interposed between the restraining members 13.

  In the array body 12, for example, a plurality (seven bodies in the present embodiment) of battery cells 11 are arrayed via a heat transfer plate 15. The battery cell 11 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The elastic body 14 is formed in a rectangular plate shape by, for example, urethane rubber sponge. For example, the area of the elastic body 14 is slightly smaller than the area of the one side surface 22a in the arrangement direction in the case 22 of the battery cell 11, and is arranged on one end side in the arrangement direction of the battery cell 11 in the array body 12. .

  Examples of the material for forming the elastic body 14 include ethylene propylene diene rubber (EPDM), chloroprene rubber, and silicon rubber. The elastic body 14 is not limited to rubber and may be a spring material or the like. The elastic body 14 is a member used for the purpose of preventing the battery cell 11 from being damaged by a restraining load, and may be disposed at both ends in the arrangement direction of the battery cell 11 or between the battery cells 11 and 11. May be.

  The restraining member 13 includes, for example, a pair of end plates 16 and 16 and a fastening member 17 that fastens the end plates 16 and 16 together. The end plate 16 has, for example, a substantially rectangular plate shape having an area larger than that when the battery cell 11 is viewed from the arrangement direction, and the outer edge portion of the end plate 16 is outside the outer edge portion of the battery cell 11. Are arranged at both ends of the array body 12 and the elastic body 14 in the array direction.

  The fastening member 17 includes, for example, a long bolt 18 and a nut 19 that is screwed to the bolt 18. The bolts 18 are inserted through the end plate 16 at positions corresponding to the four corners of the array 12 at the outer edge portion of the end plate 16, for example. A nut 19 is screwed into both ends of each bolt 18 from the outside of the end plate 16, whereby the battery cell 11, the elastic body 14, and the heat transfer plate 15 are sandwiched and unitized and a restraining load is applied. .

  For example, as shown in FIGS. 3 and 4, the battery cell 11 includes a hollow case 22 having a substantially rectangular parallelepiped shape and an electrode assembly 23 housed in the case 22. The case 22 is formed of a metal such as aluminum, for example, and an organic solvent-based or non-aqueous electrolyte is injected into the case 22, for example. As shown in FIG. 3, the positive terminal 25 and the negative terminal 26 are arranged on the top surface of the case 22 so as to be separated from each other. The positive electrode terminal 25 is fixed to one side in the width direction on the top surface of the case 22 via the insulating member 27, and the negative electrode terminal 26 is fixed to the other side in the width direction on the top surface of the case 22 via the insulating member 28. Has been.

  As shown in FIG. 4, the electrode assembly 23 includes, for example, a positive electrode 31, a negative electrode 32, and a bag-like separator 33 disposed between the positive electrode 31 and the negative electrode 32. In the electrode assembly 23, the positive electrode 31 is accommodated in the separator 33, and in this state, the positive electrode 31 and the negative electrode 32 are alternately stacked via the separator 33.

  The positive electrode 31 includes a metal foil 33a made of, for example, an aluminum foil, and a positive electrode active material layer 33b formed on both surfaces of the metal foil 33a. The positive electrode active material layer 33b is formed including a positive electrode active material and a binder. Examples of the positive electrode active material include composite oxide, metallic lithium, and sulfur. The composite oxide includes, for example, at least one of manganese, nickel, cobalt, and aluminum and lithium. A tab 31 c is formed on the upper edge of the positive electrode 31 corresponding to the position of the positive electrode terminal 25. The tab 31 c extends upward from the upper edge portion of the positive electrode 31 and is connected to the positive electrode terminal 25 via the conductive member 34.

  On the other hand, the negative electrode 32 includes a metal foil 32a made of, for example, copper foil, and a negative electrode active material layer 32b formed on both surfaces of the metal foil 32a. The negative electrode active material layer 32b is formed including a negative electrode active material and a binder. Examples of the negative electrode active material include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5 ) And the like, and boron-added carbon. A tab 32 c is formed on the upper edge of the negative electrode 32 corresponding to the position of the negative electrode terminal 26. The tab 32 c extends upward from the upper edge portion of the negative electrode 32, and is connected to the negative electrode terminal 26 via the conductive member 35.

  The separator 33 is formed in a bag shape, for example, and accommodates only the positive electrode 31 therein. Examples of the material for forming the separator 33 include a porous film made of a polyolefin-based resin such as polyethylene (PE) and polypropylene (PP), a woven fabric or a non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methylcellulose, and the like. The separator 33 is not limited to a bag shape, and a sheet shape may be used.

  Next, the structure for fixing the battery module 3 to the housing 2 will be described in more detail.

  FIG. 5 is a cross-sectional view showing a fixed state of the battery module with respect to the housing. In the drawing, the housing space S1 side of the housing 2 is illustrated, but the housing space S2 side has a similar configuration in a symmetrical manner. As shown in FIG. 5, when the battery module 3 is fixed to the housing 2, the heat transfer plate 15 attached to each battery module 3 is formed in a plate shape by a material having heat conductivity (for example, metal). The contact portion 41 that contacts the one side surface 22a in the arrangement direction in the battery cell 11 and the pair of opposite portions 42 and 42 that face the pair of other side surfaces 22b and 12b that intersect the one side surface 22a in the arrangement direction in the battery cell 11. And have.

  For example, the contact portion 41 is formed in a rectangular shape having a larger width dimension than the one side surface 22 a in the arrangement direction of the battery cells 11. The contact portion 41 is fixed to the one side surface 22a in the arrangement direction of the battery cells 11 using a double-sided tape (not shown) or the like. As the double-sided tape, it is preferable to use a tape having a base material such as polypropylene, for example, from the viewpoint of ensuring electrical insulation and heat transfer.

  The facing portion 42 is formed in a rectangular shape having substantially the same dimensions as the other side surface 22b of the battery cell. The facing portions 42 are provided at substantially right angles to the contact portions 41 at both ends in the width direction of the contact portions 41 (the width direction of the battery cells 11). In a state where the contact portion 41 is fixed to the one side surface 22a in the arrangement direction of the battery cells 11, the one facing portion 42 and one other side surface 22b of the battery cell 11 face each other while being separated from each other. Of the battery cell 11 and the other other side surface 22b of the battery cell 11 are opposed to each other in a separated state.

  The leading end portion of one facing portion 42 extends toward the base end portion of one facing portion 42 of the heat transfer plate 15 provided in the adjacent battery cell 11. When viewed as a whole of the battery module 3, one facing portion group 42 </ b> A of each heat transfer plate 15 has a substantially flat plate shape. Similarly, the distal end portion of the other facing portion 42 extends toward the base end portion of the other facing portion 42 of the heat transfer plate 15 provided in the adjacent battery cell 11. When viewed as a whole of the battery module 3, the other facing portion group 42B of each heat transfer plate 15 has a substantially flat plate shape.

  In addition, the front-end | tip part of one opposing part 42 and the base end part of one opposing part 42 of the heat-transfer plate 15 provided in the adjacent battery cell 11 may be in contact, and are slightly spaced apart. May be. Further, the distal end portion of the other facing portion 42 and the proximal end portion of the other facing portion 42 of the heat transfer plate 15 provided in the adjacent battery cell 11 may be in contact with each other or slightly separated from each other. May be.

  In the battery module 3, one opposing portion group 42 </ b> A abuts on the heat transfer member 43 provided on the standing portion 7 side, and the other opposing portion group 42 </ b> B is provided on the heat transfer member 43 provided on the lid portion 5 side. In a contact state, it is fixed to the standing portion 7 via a bracket (not shown). The battery module 3 in the accommodation space S is constrained in a direction intersecting the arrangement direction of the battery cells 11 by the standing part 7 of the main body part 4 and the side wall 8A or the side wall 9A of the lid part 5. More specifically, the heat transfer member 43 is sandwiched between the standing 7 of the main body 4 and the battery module 3, and between the side wall 8 </ b> A or the side wall 9 </ b> A of the lid 5 and the battery module 3. The battery module 3 is restrained to dissipate heat between the cover 5 and the lid 5.

  As described above, in the battery pack 1, the one opposing portion 42 of the heat transfer plate 15 contacts the heat transfer member 43 provided on the one side surface 7 a and the other side surface 7 b of the standing portion 7 in the main body portion 4. The battery module 3 in the accommodation space S is connected to the main body 4 and the lid in a state where the other facing portion 42 of the heat transfer plate 15 is in contact with the heat transfer member 43 provided on the side surface 8a and the side surface 9a of the lid portion 5. The part 5 is restrained. As described above, since the battery module 3 is restrained by the main body portion 4 and the lid portion 5, the occurrence of bending of the battery module 3 due to the reaction force from the heat transfer member 43 is suppressed. The heat transfer member 43 can be firmly brought into contact with the heat transfer member 43. Therefore, the heat transfer efficiency through the heat transfer plate 15 can be improved.

  In the battery pack 1 of the present embodiment, the heat transfer member 43 is provided on one side surface 7 a and the other side surface 7 b of the standing portion 7, and the heat transfer member 43 is provided on the side surface 8 a and the side surface 9 a of the lid portion 5. Thereby, the heat generated in the battery cell 11 can be dissipated to both the main body 4 side and the lid 5 side via the heat transfer plate 15, and the heat dissipation efficiency of the battery cell 11 is enhanced. Further, the temperature distribution in the battery cell 11 can be made uniform as compared with the case where heat is radiated to either the main body 4 side or the lid 5 side. Furthermore, in the battery pack 1, the one facing portion 42 of the heat transfer plate 15 and one other side surface 22 b of the battery cell 11 are separated from each other, and the other facing portion 42 of the heat transfer plate 15 and the other other side of the battery cell 11 are separated. The side surface 22b is separated. With such a configuration, the space between the facing portion 42 of the heat transfer plate 15 and the battery cell 11 can be used as a flow path for the cooling medium.

Further, in the battery pack 1, the main body portion 4 of the housing 2 has a base portion 6 and a plate-like standing portion 7 standing on the base portion 6, and one side surface 7 a and the other side surface of the standing portion 7. 7b becomes the 1st inner wall surface in which the heat-transfer member 43 is each provided. The lid portion 5 of the housing 2 includes a first divided member 8 and a second divided member 9 that are divided into the one side surface 7 a side and the other side surface 7 b side of the standing portion 7. The side surface 8 a facing the one side surface 7 a of the standing portion 7 in the first divided member 8 is a second inner wall surface on which the heat transfer member 43 is provided. A side surface 9 a facing the other side surface 7 b of the part 7 is a second inner wall surface on which the heat transfer member 43 is provided. Thereby, many battery modules 3 can be accommodated in the housing | casing 2 by simple structure, and the heat-transfer efficiency via the heat-transfer plate 15 in each battery module 3 can be improved.
[Second Embodiment]

  FIG. 6 is a cross-sectional view showing a fixed state of the battery module with respect to the housing in the battery pack according to the second embodiment of the present invention. As shown in the figure, the battery pack 51 according to the second embodiment includes the other facing portion of the heat transfer plate 15 in that the other facing portion group 42B of the heat transfer plate 15 is in contact with the heat generating member 52. This is different from the first embodiment in which the group 42B is in contact with the heat transfer member 43.

  More specifically, for example, a sheet heater is used as the heating member 52. The heat generating member 52 has an area equivalent to, for example, the other facing portion group 42 </ b> B of the heat transfer plate 15, and the side surface 8 a of the first divided member 8 and the side surface 9 a of the second divided member 9 through the heat insulating member 53. Are provided respectively. The battery module 3 has one opposing portion group 42A in contact with the heat transfer member 43 provided on the standing portion 7 side, and the other opposing portion group 42B on the heat generating member 52 provided on the lid portion 5 side. Is fixed to the standing portion 7 via a bracket (not shown). The battery module 3 in the accommodation space S is constrained in a direction intersecting the arrangement direction of the battery cells 11 by the standing part 7 of the main body part 4 and the side wall 8A or the side wall 9A of the lid part 5. The heat insulating member 53 is made of, for example, glass wool, urethane foam, foamed polystyrene, foamed rubber, or the like.

  Also in the battery pack 51 as described above, one facing portion 42 of the heat transfer plate 15 contacts the heat transfer member 43 provided on the one side surface 7a and the other side surface 7b of the standing portion 7 in the main body portion 4, and The battery module 3 in the accommodation space S is in the state where the other facing portion 42 of the heat transfer plate 15 is in contact with the heat generating member 52 provided on the side surface 8 a and the side surface 9 a of the lid portion 5. And is restrained by. As described above, since the battery module 3 is restrained by the main body portion 4 and the lid portion 5, the occurrence of bending of the battery module 3 due to the reaction force from the heat transfer member 43 and the heat generating member 52 is suppressed. The heat plate 15, the heat transfer member 43, and the heat generation member 52 can be firmly brought into contact with each other. Therefore, the heat transfer efficiency through the heat transfer plate 15 can be improved.

  In the battery pack 51 of this embodiment, the heat transfer member 43 is provided on one side surface 7 a and the other side surface 7 b of the standing portion 7, and the heat generating member 52 is provided on the side surface 8 a and the side surface 9 a of the lid portion 5. Thereby, the heat generated in the battery cell 11 can be radiated to the main body 4 side via the heat transfer plate 15, while the heat generated in the heat generating member 52 is transferred to the battery cell 11 via the heat transfer plate 15. Heat can be transferred. Such a configuration is particularly useful when, for example, the battery pack 51 is used in a cold region. Further, in the battery pack 51, the one facing portion 42 of the heat transfer plate 15 and one other side surface 22 b of the battery cell 11 are separated from each other, and the other facing portion 42 of the heat transfer plate 15 and the other other side of the battery cell 11 are separated. The side surface 22b is separated. With such a configuration, the space between the facing portion 42 of the heat transfer plate 15 and the battery cell 11 can be used as a flow path for the cooling medium or the heating medium.

  Further, in the battery pack 51, the heat generating members 52 are provided on the side surface 9 a of the first split member 8 and the side surface 9 a of the second split member 9 via the heat insulating member 53, respectively. Thereby, the heat generated in the heat generating member 52 can be more reliably transferred to the battery cell 11 side. From the viewpoint of efficiently transferring the heat generated in the heat generating member 52 to the battery cell 11, the thermal resistance between the one opposing portion 42 of the heat transfer plate 15 and the heat transfer member 43 is the heat transfer plate 15. It is preferable that the thermal resistance between the contact portion 41 and the one side surface 22a in the arrangement direction of the battery cells 11 is larger. As a method for adjusting the thermal resistance, for example, the material, thickness, area, and the like of the heat transfer member 43 between one facing portion 42 of the heat transfer plate 15 and the housing 2 (the standing portion 7) are set. The material, thickness, area, etc. of the tape between the battery cell 11 and the heat transfer plate 15 (contact part 41) can be adjusted.

  Moreover, also in the battery pack 51, the housing | casing 2 has the structure similar to 1st Embodiment. Therefore, a large number of battery modules 3 can be accommodated in the housing 2 with a simple configuration, and the heat transfer efficiency via the heat transfer plate 15 in each battery module 3 can be improved.

  The present invention is not limited to the above embodiment. For example, in each of the above embodiments, the housing 2 is configured by joining the main body 4 having the base portion 6 and the standing portion 7 to the lid portion 5 including the first divided member 8 and the second divided member 9. However, the configuration of the housing 2 is not limited to this. For example, as shown in FIG. 7, a housing 62 may be configured by joining a flat lid portion 65 to an opening portion of a main body portion 64 opened on one side.

  DESCRIPTION OF SYMBOLS 1,51 ... Battery pack, 2 ... Housing | casing, 4 ... Main-body part (1st housing member), 5 ... Cover part (2nd housing member), 6 ... Base part, 7 ... Standing part, 7a ... one side surface (first inner wall surface), 7b ... other side surface (first inner wall surface), 8 ... first divided member, 8a ... side surface (second inner wall surface), 9 ... second divided member, 9a ... side surface (second inner wall surface), 11 ... battery cell, 12 ... array, 22a ... one side surface, 22b ... other side surface, 41 ... contact portion, 42 ... facing portion, 43 ... heat transfer member, 52 ... Heat generating member, 53 ... heat insulating member.

Claims (4)

A battery pack in which a battery module having an array of a plurality of battery cells is housed in a housing,
The housing is
A first housing member having a first inner wall surface provided with a heat transfer member;
A second housing member facing the first inner wall surface and having a second inner wall surface provided with a heat transfer member or a heat generating member;
Each battery cell of the battery module is provided with a heat transfer plate,
The heat transfer plate has a contact portion that contacts one side surface in the arrangement direction of the battery cells, and a pair of facing portions that face a pair of other side surfaces intersecting the one side surface of the battery cells,
Before SL cell module, wherein the heat transfer one of the opposing portions of the heat plate is brought into contact with the heat transfer member provided in the first inner wall surface of the first housing member, and the other of the heat transfer plate The first casing member and the second casing in a state where the facing portion is in contact with the heat transfer member or the heat generating member provided on the second inner wall surface of the second casing member. It is restrained with the member ,
The first casing member includes a base portion and a plate-like standing portion standing on the base portion, and one side surface and the other side surface of the standing portion are respectively the first inner wall surface. And
The second casing member has a first divided member and a second divided member which are divided into the one side surface side and the other side surface side of the standing portion, and the first divided member Has the second inner wall surface facing the one side surface of the standing portion, and the second dividing member has the second inner wall surface facing the other side surface of the standing portion. the battery pack you are. The heat transfer member is provided on the second inner wall surface of the second casing member;
The one opposing portion of the heat transfer plate and one other side surface of the battery cell are separated from each other, and the other opposing portion of the heat transfer plate and the other other side surface of the battery cell are separated from each other. Item 6. The battery pack according to Item 1. The heating member is provided on the second inner wall surface of the second casing member;
The one opposing portion of the heat transfer plate and one other side surface of the battery cell are separated from each other, and the other opposing portion of the heat transfer plate and the other other side surface of the battery cell are separated from each other. Item 6. The battery pack according to Item 1.   The battery pack according to claim 3, wherein the heat generating member is provided on the second inner wall surface via a heat insulating member.

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