JP2014192091A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module that is excellent in heat dissipation.SOLUTION: A power storage module includes: a lamination body where a plurality of plate-shaped power storage elements and a plurality of heat conductive plates, which are made of a heat conductive material that conducts heat generated at the power storage elements to the outside, are laminated; and a metal-made case in which the lamination body is accommodated, wherein a plurality of heat conductive walls, which extend in a direction along a lamination direction of the lamination body, are provided for edge portions of the heat conductive plates at intervals therebetween and a plurality of heat dissipation holes are provided in a surface of the case opposing the heat conductive walls.

Description

  The present invention relates to a power storage module.

  Secondary batteries such as lithium ion batteries and nickel metal hydride batteries are known as examples of power storage elements in which power storage elements are housed. Secondary batteries, such as a lithium ion battery, comprise a battery module by connecting two or more. As such a battery module, for example, a battery module described in Patent Document 1 is known.

JP 2006-210312 A

  In a power storage module in which a plurality of power storage elements are stacked as in the battery module described in Patent Document 1, the power storage elements may become hot due to repeated charge and discharge. When the power storage element becomes high temperature, there is a concern that the performance is lowered.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrical storage module excellent in heat dissipation.

  The power storage module of the present invention is a laminate in which a plurality of plate-shaped power storage elements and a plurality of heat transfer plates made of a heat conductive material that conducts heat generated in the power storage elements to the outside are stacked, A plurality of heat conduction walls extending in a direction along the stacking direction of the laminate at intervals from each other at the edge of the heat transfer plate. In the case, a plurality of heat radiation holes are provided on a surface of the case that faces the heat conducting wall.

  According to the present invention, the heat generated by the electricity storage element inside the case is radiated outside the case through the heat radiating hole. Therefore, the heat dissipation of the power storage module is improved.

  The heat transfer wall of the heat transfer plate is provided in a row in the stacking direction of the stacked body and the heat transfer wall of the adjacent heat transfer plate to form a heat transfer wall group, and the heat dissipation hole May be provided between adjacent rows of the heat conducting wall groups, and the heat conducting wall groups may be in contact with the inner wall surface of the case.

  With such a configuration, the heat in the case generated by the electricity storage element is radiated from the heat dissipation hole to the outside of the case, and quickly from the heat conduction wall of the heat transfer plate to the entire case through the inner wall surface of the case. It is transmitted and dissipated from the entire case.

  Alternatively, the heat conductive wall of the heat transfer plate is provided in a row in the stacking direction of the stacked body and the heat conductive wall of the adjacent heat transfer plate to form a heat conductive wall group, The heat radiating hole may be provided at a position where the heat conducting wall group communicates with the outside of the case.

  Thus, when it is set as the structure with which a heat conductive wall is connected with the exterior of a case via a thermal radiation hole, it becomes possible to cool a heat conductive wall directly from the outside. Further, when the surrounding environment contains a lot of dust and dirt, the heat radiation holes are blocked by the heat conducting wall group, so that it is difficult for dust and dirt to enter the case.

  Moreover, the opening edge part of the front end side in the insertion direction of the said laminated body among the said heat radiating holes is good also as a structure inclined or circular arc shape with respect to the insertion direction of the said laminated body.

  With such a configuration, when the laminated body is accommodated in the case, it is possible to prevent the leading edge in the insertion direction of the laminated body from being caught by the opening edge portion of the heat dissipation hole, and workability at the time of assembly. Can be improved.

  Further, the power storage element has positive and negative lead terminals projecting outward from the end portions, and the lead terminals having different polarities of the adjacent power storage elements are bent in opposite directions and the end portions are connected to each other. The power storage elements are connected by overlapping welding, and the power storage element is provided with a holding member made of an insulating resin that holds both ends thereof, and the holding member has a difference in polarity between the adjacent power storage elements. An insertion port is formed in which a jig for welding the lead terminal to be inserted can be inserted from a direction intersecting the protruding direction of the lead terminal, and the heat dissipation hole communicates the insertion port with the outside of the case. You may make it provide in a position.

  If it is such a structure, the insertion port for inserting a jig | tool for welding originally can be utilized also for heat radiation, and heat dissipation can be improved more.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module excellent in heat dissipation can be provided.

The perspective view of the electrical storage module concerning one embodiment Side view of power storage module Perspective view of laminate Side view of laminate

  An embodiment in which the present invention is applied to a battery module 10 will be described with reference to FIGS. In the following description, the left front side in FIG. 1 is the front, the right rear side is the rear, the upper is the upper, and the lower is the lower.

  The battery module 10 of the present embodiment is used as, for example, a battery module 10 for an integrated starter generator (ISG).

(Battery module 10)
As shown in FIG. 1, the battery module 10 has a substantially rectangular parallelepiped shape as a whole. The battery module 10 is connected to a lead terminal 34 of each unit cell 32 (an example of a storage element) to be described later from the front surface (surface on the left front side in FIG. 1) and the back surface (surface on the right rear side in FIG. 1). A plurality of electric wires 65 are led out to the outside. Each of the plurality of electric wires 65 has one end connected to the lead terminal 34 of the cell 32 via a voltage detection terminal (not shown), and the other end connected to a voltage detection output connector 64 (hereinafter referred to as “connector 64”). It is connected.

  The plurality of connectors 64 connected to the electric wires 65 led out to the front side and the plurality of connectors 64 connected to the electric wires 65 led out to the back side are respectively laminated and integrated.

  The battery module 10 includes a laminated body 30 including a plurality of plate-shaped single cells 32, a plurality of heat transfer plates 60, and a plurality of holding members 40 that hold these, and a metal member that houses the laminated body 30. The case 11 is provided. As shown in FIGS. 3 and 4, each single battery 32 is placed on each heat transfer plate 60, and both edges on the short side are held by each holding member 40. In the present embodiment, the battery unit 31 is the one in which the single battery 32 is mounted on the heat transfer plate 60 and the holding members 40 are attached to both edges. The stacked body 30 is formed by stacking six battery units 31.

(Single cell 32)
As shown in FIG. 3, each unit cell 32 has a substantially rectangular shape when viewed from above, and is arranged substantially in parallel, with the surface of the outer surface having a large area arranged vertically. As a result, the surface having a large area comes into contact with the heat transfer plate 60 and is excellent in heat dissipation.

  Each unit cell 32 is a laminate type battery. Each unit cell 32 includes a power generation element (not shown), a laminate film 33 that encloses the power generation element and has an edge welded thereto, and is connected to the power generation element and projects outward from the welded edge of the laminate film 33. Lead terminal 34.

(Lead terminal 34)
In FIG. 3, the lead terminal 34 protruding from the rear edge (right rear side) of the unit cell 32 arranged in the first stage (uppermost stage) from the top is a positive terminal, and the front side edge (left front side in the figure) The lead terminal 34 protruding from) is a negative electrode terminal. The unit cells 32 adjacent in the stacking direction are arranged and connected such that lead terminals 34 having different polarities are arranged at positions facing each other.

  Specifically, out of the six unit cells 32, the negative lead terminal 34A protruding from the front edge in the drawing of the first unit cell 32 from the top, and the positive electrode protruding from the front edge of the sixth step from the top Each lead terminal 34A is formed with a U-shaped protrusion 35 by bending, and the portion of the lead terminal 34A closer to the end than the U-shaped protrusion 35 is in the protruding direction. It has a substantially parallel straight line. These lead terminals 34A are overlapped with and connected to the bus bar 38 via a voltage detection terminal (not shown) to form a bus bar connection terminal 34A.

  On the other hand, the lead terminals 34B other than the bus bar connection terminal 34A are bent in a substantially vertical shape so as to be opposite to the lead terminals 34B adjacent in the vertical direction after passing through the projecting portion 36 that is arcuate from the side. It is J-shaped. And it has piled up so that those edge parts may contact, and is connected by welding. These lead terminals 34B are inter-terminal connection terminals 34B. In each of the unit cells 32 from the second stage to the fifth stage, the lead terminal 34B protruding from one edge and the lead terminal 34B protruding from the other edge are bent in opposite directions. .

  The U-shaped protrusion 35 formed on the lead terminal 34A has a function of relieving the stress received by the lead terminal 34A when connecting the lead terminal 34A and the bus bar 38. The arc-shaped protrusion 36 formed on the lead terminal 34B has a function of relieving the stress received by the lead terminal 34B when welding the lead terminals 34B and 34B.

  In each lead terminal 34, a locking protrusion 37 that protrudes in the vertical direction and is locked to the holding member 40 is formed between the end 33 </ b> B of the laminate film 33 and the protrusions 35 and 36.

  The region 34a on the end 33B side of the laminate film 33 in the lead terminal 34 is a wide region 34a wider than the region 34b on the end side, and a corner portion 34c on the end side of the wide region 34a is a holding member 40 described later. The movement of the unit cell 32 is regulated by being fitted into the unit cell holding part 51.

(Bus bar 38)
The bus bar 38 connected to the uppermost unit cell 32 is a terminal 38B that functions as a negative electrode of the battery module 10, and the bus bar 38 connected to the lowermost unit cell 32 functions as a positive electrode of the battery module 10. 38A. Each bus bar 38 is made of a conductive material such as pure aluminum, an aluminum alloy, copper, or a copper alloy, and a terminal portion 39 connected to an external device is a portion 39 led out from a bus bar lead-out port 29B of an insulating lid member 26 described later. It is.

(Holding member 40)
Each unit cell 32 is held in a state of being placed on the heat transfer plate 60 by a holding member 40 made of an insulating resin. The holding members 40 are disposed at both ends of the unit cell 32 in the front-rear direction.

  The holding member 40 is provided with two through holes 43 penetrating in a vertical direction through which a first fixing member (not shown) of the case 11 described later can be inserted. Further, a terminal arrangement part (not shown) for arranging and holding the lead terminals 34 is formed on the upper surface of the holding member 40, and a locking projection 37 of the lead terminal 34 is formed on this terminal arrangement part. A locking groove (not shown) for receiving and locking is provided. The locking groove has a function of locking the lead terminal 34 and positioning the unit cell 32.

  A thick region 52 having a thickness dimension larger than that of the terminal placement portion is provided in a region adjacent to the terminal placement portion of each holding member 40, and the wide region 34 a of the lead terminal 34 is provided in the thick thickness region 52. A concave unit cell holding portion 51 into which the corner portion 34c on the end side is fitted is formed. The movement of the lead terminal 34 (unit cell 32) is restricted by the unit cell holding portion 51.

  In addition, bus bar holding portions 49 that hold the bus bars 38 are formed on the holding members 40 arranged in the first and sixth stages from the top on the front side. The bus bar holding portion 49 is formed with a concave portion 49A into which the bus bar 38 is fitted, and a retaining projection 49B that prevents the bus bar 38 fitted into the concave portion 49A from coming off.

  Furthermore, on the front side, the holding members 40 are arranged in the first, third, fifth, and sixth stages from the top, and in the rear, the second, fourth, and sixth stages from the top. Each of the holding members 40 includes a terminal holding portion (not shown) for holding the voltage detection terminal, and a wire receiving groove (not shown) for holding the electric wire 65 connected to the voltage detection terminal. Is provided.

  A laminated body holding member (not shown) is provided on the back side of the laminated body 30 between the connection portion of the lead terminal 34 arranged on the back side and the case 11 to insulate and protect the lead terminal 34. It can be attached. On the rear side, the holding member 40 arranged in the first stage from the top has a locking hole (not shown) for locking the laminated body holding member, and an attachment recess (not shown) to which the laminated body holding member is attached. And are provided.

  In the present embodiment, of the holding members 40 that overlap in the up-down direction, one holding member 40 is formed with a locking claw (not shown) that protrudes toward the other holding member 40 and protrudes inward. Engaging protrusion 41 is provided, and the other holding member 40 has a recessed shape for receiving the engaging protrusion 41 and an engagement receiving portion (not shown) for locking the locking claw. 42 is provided. The engaging protrusion 41 and the engagement receiving portion 42 are structured to engage with each other. The holding members 40, 40 adjacent in the vertical direction are engaged at two locations on the front and rear surfaces and the left and right side surfaces of the laminate 30. Specifically, it is as follows.

  With respect to the holding member 40 arranged on the front side (the left front side in FIG. 3) of the laminated body 30, an engagement protrusion 41 extending upward is provided on the front surface of the third and fifth stages from the top. On the front surface of the 2nd and 4th stages from the top, there is provided an engagement receiving part 42 that engages with each of the third and fifth engagement protrusions 41 from the top.

  In addition, the left and right side surfaces of the second, fourth, and sixth steps from the top are provided with engaging protrusions 41 extending upward, while the left and right side surfaces of the first, third, and fifth steps from the top are provided with 2 from the top. , 4 and 6 are respectively provided with engagement receiving portions 42 that engage with the respective engagement projections 41.

  On the other hand, with respect to the holding member 40 arranged on the rear side (the right rear side in FIG. 3) of the laminated body 30, an engagement protrusion 41 extending upward is provided on the back surface of the second, fourth, and sixth stages from the top. On the other hand, on the back of the first, third, and fifth stages from the top, there is provided an engagement receiving part 42 that mutually engages with the respective second, fourth, and sixth stage engagement protrusions 41. .

  Further, the left and right side surfaces of the third and fifth steps from the top are provided with engaging protrusions 41 extending upward, while the left and right sides of the second and fourth steps from the top are provided with the third and fifth steps from the top. An engagement receiving portion 42 that engages with each of the engagement protrusions 41 is provided.

  The engaging protrusion 41 of the holding member 40 is adapted to fit inside the engagement receiving portion 42 of the holding member 40 that overlaps the holding member 40, and the plurality of holding members 40 are overlapped to be in an engaged state. Both the engagement protrusion 41 and the engagement receiving portion 42 do not protrude outside the holding member 40.

  In the present embodiment, as shown in FIGS. 3 and 4, when the plurality of battery units 31 are stacked, the space S between the holding members 40, 40 adjacent in the vertical direction is formed on the left and right side surfaces of the holding member 40. Is to be formed.

  Specifically, on the front side, the lower side of the left and right side surfaces of the holding member 40 arranged in the second and fourth stages from the top, and the left and right side surfaces of the holding member 40 arranged in the third and fifth stages from the top. The upper side has a concave shape, and when these two holding members 40, 40 are overlapped, a space penetrates between the holding members 40, 40 substantially parallel to the short side direction of the laminate film 33 of the cell 32. S is formed.

  Similarly, on the rear side, they are arranged on the lower side of the left and right side surfaces of the holding member 40 arranged on the first, third, and fifth stages from the top, and on the second, fourth, and sixth stages from the top. The upper sides of the left and right side surfaces of the holding member 40 are also recessed, and spaces S are formed between the holding members 40 and 40, respectively.

  In the space S between the holding members 40 adjacent to each other in the vertical direction, connecting portions of lead terminals 34B and 34B having different polarities adjacent to each other in the vertical direction are arranged. In this space S, a jig (not shown) for welding adjacent lead terminals 34B, 34B having different polarities can be inserted, and the entrance portion of the space S is inserted to insert the jig into the space S. It is a mouth 71.

(Heat transfer plate 60)
In the present embodiment, each single battery 32 is placed on a heat transfer plate 60 made of a heat conductive material. In the present embodiment, aluminum or aluminum alloy having excellent heat conductivity is used as the heat conductive material. On the pair of side edges in the longitudinal direction of the heat transfer plate 60, four upstanding walls 61 are formed at intervals of four. The upright wall 61 is a heat conducting wall 61 that is disposed so as to contact the inner wall surface of the case 11 when the stacked body 30 is accommodated in the case 11, and conducts heat generated from the unit cell 32 to the case 11. . The heat generated from the unit cell 32 is transmitted to the case 11 through the heat conducting wall 61 and is radiated to the outside of the case 11.

  In addition, when the battery units 31 are stacked, the heat conductive walls 61 are set so as to be arranged in a row in the stacking direction of the heat conductive walls 61 of the adjacent heat transfer plates 60 and the stacked body 30. The heat conducting walls 61 arranged in a row are called a heat conducting wall group 62.

  Inside the pair of side edges in the longitudinal direction of the heat transfer plate 60, elastic deformation grooves (not shown) having a U-shape in cross section are provided in parallel with the side edges in the longitudinal direction. These elastic deformation grooves are elastically deformed so that the heat conducting wall 61 comes into contact with the inner wall of the case 11 with a high contact pressure, thereby ensuring heat conduction.

  In the present embodiment, the distance between the pair of heat conducting walls 61 and 61 at the opposing positions is the distance between the inner wall surfaces of the pair of side walls 12A and 12A arranged in the width direction of the case body 12 in the natural state. Same or slightly larger. The heat transfer plate 60 has a fixing hole (not shown), and is fixed to the holding member 40 by fitting the heat transfer plate fixing portion (not shown) of the holding member 40 described above into the fixing hole.

(Case 11)
The case 11 includes a case main body 12 that houses the stacked body 30 and a lid portion 18 that covers the upper surface of the case main body 12. The case body 12 has an upper surface and a front surface that are open. At the upper end of the rear surface of the case main body 12, an electric wire outlet hole (not shown) for leading the plurality of electric wires 65 out of the case 11 is formed. An insulating lid member 26 is attached to the opening on the front surface of the case body 12.

  As shown in FIG. 1, the lid portion 18 is connected to a substantially rectangular plate-like portion 19, and the plate-like portion 19 from the both side edge portions and the rear edge portion substantially vertically downward, and the upper end portion of the case body 12. And a fixing portion 23 to be fixed to. A projecting surface 20 that projects inward (downward) is formed at the center of the plate-like portion 19. The protruding surface 20 of the lid portion 18 is set so as to be in contact with the unit cell 32 at the uppermost stage (first stage from the top). When the projecting surface 20 of the lid portion 18 and the unit cell 32 are in contact with each other, heat generated from the unit cell 32 is transmitted to the lid unit 18 and is radiated to the outside.

  In the plate-like portion 19, fixing is performed in which first fixing members (not shown) for fixing the lid portion 18, the laminate 30, and the case main body 12 are arranged at the four corners outside the protruding surface 20. A hole 21 is formed through. The hole diameter of the fixing hole 21 is smaller than the outer diameter of the first fixing member.

  Further, in the plate-like portion 19, a rectangular hole 22 is formed through the front end portion side. The hole 22 serves as a lid locking hole 22 for locking an insulating lid member 26 attached to the front side.

  The fixing portion 23 is formed with a plurality (three each) of insertion holes 24 through which a second fixing member (not shown) for fixing the lid portion 18 to the case body 12 can be inserted. The fixing portion 23 is overlapped on the pair of left and right side surfaces and the rear surface outside of the case body 12.

  Bus bar outlets 29 </ b> B and 29 </ b> B through which the bus bar 38 is led out are formed in the insulating lid member 26 attached to the opening on the front side of the case body 12.

  A substantially rectangular cutout 29 </ b> A for leading out the plurality of electric wires 65 is provided at the lower end of the insulating lid member 26. The insulating lid member 26 has a function of not only covering the opening of the case body 12 but also insulating and protecting the lead terminal 34 disposed on the front end face side of the stacked body 30.

  Further, a plurality of (five in this embodiment) heat radiation holes 25 are arranged at intervals in the front-rear direction on the pair of opposing side walls 12A, 12A (surfaces facing the heat conduction wall 61) of the case body 12. Is provided. In the present embodiment, the heat radiating hole 25 has a circular opening edge. The center three of the five heat dissipation holes 25 are set so as to be positioned between the heat conducting wall groups 62 and 62 adjacent in the front-rear direction when the laminated body 30 is accommodated in the case body 12. The portion of the side edge portion of the heat transfer plate 60 where the heat conducting wall 61 is not provided is exposed to the outside. Further, the inner wall surface of the portion between the adjacent heat radiation holes 25, 25 (referred to as the shielding portion 12 </ b> B) in the side wall 12 </ b> A is in contact with the heat conducting wall group 62.

  Further, the heat radiating holes 25 arranged at both ends are provided at positions where at least a part of the insertion port 71 of the gap S provided in the holding member 40 is exposed.

(Assembly method of battery module 10 of this embodiment)
Next, a method for assembling the battery module 10 of the present embodiment will be described. First, a total of six heat transfer plates 60 having a predetermined shape are prepared, and the heat transfer plate fixing portions (not shown) of the holding members 40 respectively corresponding to the fixing holes (not shown) are fitted. The holding member 40 is attached to the heat transfer plate 60.

  Next, the electric wire 65 to which the connector 64 is connected is attached to the holding member 40 having the electric wire receiving groove, and the bus bar 38 is attached to the holding member 40 having the bus bar holding portion 49. Specifically, the operation of attaching the electric wire 65 to which the connector 64 is connected can be performed by placing the voltage detection terminal on the terminal holding portion of the holding member 40 and accommodating the electric wire 65 in the electric wire accommodation groove.

  The work of attaching the bus bar 38 is performed as follows. When the bus bar 38 is inserted into the recessed portion 49A of the bus bar holding portion 49, the bus bar 38 and the retaining projection 49B come into contact with each other, and the retaining projection 49B bends and deforms outward. When the bus bar 38 is fitted into the recess 49A, the retaining protrusion 49B is elastically restored, restricting the upward movement of the bus bar 38 and becoming a retaining state.

  Next, the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40 is attached. Specifically, the unit cell 32 including the first lead terminal 34A is placed on the two heat transfer plates 60 to which the holding member 40 including the bus bar holding portion 49 is attached, and other heat transfer is performed. On the plate 60, the cell 32 provided with the second lead terminal 34B is placed.

  In the two heat transfer plates 60 to which the holding members 40 including the bus bar holding portions 49 are attached, the locking protrusions 37 of the lead terminals 34 with the first lead terminals 34A arranged on the bus bar holding portion 49 side. Is fitted into the locking groove (not shown) of the terminal arrangement portion, and the cell 32 is transmitted so that the corner portion 33c of each lead terminal 34 fits into the cell holding portion 51 of each holding member 40. Place on the hot platen 60.

  Also in the other heat transfer plates 60, the locking protrusions 37 of the lead terminals 34 are fitted in the locking grooves (not shown) of the terminal arrangement portions, and the corners 33c of the lead terminals 34 are The unit cell 32 is placed on the heat transfer plate 60 so as to fit into the unit cell holding part 51 of the holding member 40.

  By doing so, the lead terminal 34 of the unit cell 32 is locked by the locking groove 46, thereby preventing the unit cell 32 from being displaced and the unit cell 32 is moved by the unit cell holding portion 51. Be regulated.

  In this way, a plurality of (six) battery units 31 are obtained.

  Six battery units 31 are stacked in order from the bottom. The engagement receiving portion 42 of the holding member 40 arranged in the second step from the bottom (the fifth step from the top) is formed with the engagement protrusion formed in the holding member 40 arranged in the bottom step (the sixth step from the top). The battery units 31 are stacked so as to correspond to the portions 41.

  When the holding member 40 arranged on the upper side is moved downward, the engaging projection 41 is fitted into the engagement receiving portion 42, and the locking claw of the engagement protruding portion 41 is engaged in the engagement receiving portion 42. When contacting the stop projection, the movement of the engagement projection 41 is restricted, and the engagement projection 41 and the engagement receiving portion 42 are engaged with each other.

  When six battery units 31 are stacked by repeating the same operation, one engagement protrusion 41 and the other engagement receiving portion 42 of the holding member 40 that overlap in the vertical direction are mutually engaged and integrated. A laminated body 30 as shown in FIG. 3 is obtained. At this time, the through holes 43 of the holding members 40 stacked in six steps are overlapped to form one through hole, and a space S is formed between the adjacent holding members 40 and 40. Further, the heat conducting walls 61 provided on each heat transfer plate 60 are arranged in a row in the stacking direction of the stacked body 30 to form a heat conducting wall group 62.

  When the battery unit 31 is stacked, the connector 64 is also stacked and integrated.

  Next, a welding jig is inserted into the space S from the insertion port 71 between the holding members 40 adjacent to each other in the vertical direction, and the ends of the two lead terminals 34B, 34B adjacent to each other in the vertical direction ( The straight portions are joined together. By sandwiching a portion where the ends of the two lead terminals 34B and 34B overlap with each other with a pair of jigs inserted in a direction intersecting the protruding direction of the lead terminal 34, welding is performed by irradiating with laser light. Adjacent lead terminals 34B and 34B having different polarities are connected to each other.

  A laminated body holding member is attached to the rear end face side of the laminated body 30 obtained in this way, and the laminated body 30 is brought into a holding state.

  Next, the connector-attached electric wire 65 led out from the back side of the multilayer body 30 is led out from an electric wire outlet hole formed in the upper end of the rear surface of the case main body 12 to accommodate the multilayer body 30 in the case main body 12. At this time, there is a possibility that the heat conduction wall group 62 protruding sideways in the laminate 30 may be caught by the opening edge of the heat dissipation hole 25 of the case body 12. In this embodiment, the opening edge of the heat dissipation hole 25 is used. Is circular and has an angle with the lower end edge (tip portion in the insertion direction) of the heat conducting wall 61, the lower end edge of the heat conducting wall 61 is the opening edge of the heat radiation hole 25. It is prevented from being caught on the surface and is excellent in workability.

  When the laminated body 30 is accommodated in the case main body 12, the heat conduction wall 61 and the inner wall surfaces of the side walls 12A and 12A (shielding portion 12B) of the case main body 12 come into contact with each other, so that the elastic deformation grooves of the heat transfer plate 60 are formed. Elastically deforms in a direction to reduce the distance between the heat conducting walls 61. When the stacking operation of the laminated body 30 is finished, the heat conducting wall 61 is elastically brought into contact with the inner wall surface of the side wall 12 </ b> A of the case body 21. At this time, the heat radiating holes 25 are located between adjacent rows of the heat conducting wall groups 62, and the portion where the heat conducting wall 61 is not provided in the side edge portion of the heat transfer plate 60 in the front-rear direction. Is exposed to the outside. A part of the heat conducting wall group 62 is exposed from the heat radiation hole 25. Further, the insertion port 71 of the holding member 40 is also exposed from the heat radiation hole 25 (see FIGS. 1 and 2).

  Next, the insulating lid member 26 is attached to the opening on the front side of the case body 12. Specifically, the electric wire with connector 65 led out from the front side of the laminated body 30 is led out from the notch 29A of the insulating lid member 26, and the bus bar 38 is led out from the bus bar outlet 29B of the insulating lid member 26. The insulating lid member 26 is attached to the case body 12. Next, when the lid 18 is placed so as to cover the upper surface of the case body 12, the battery module 10 as shown in FIG. 1 is obtained.

  Next, between the lid portion 18 and the bottom portion of the case body 12, the first fixing member is passed through the through-holes 43 of the holding member 40 disposed at both ends of the laminated body 30, and a treatment (not shown) is performed. After the fixing hole 21 of the lid 18, the hollow first fixing member and the fixing hole of the bottom of the case main body 12 are inserted into the tool for alignment, the lid 18 and the case main body 12 are attached using screws or pins. Fix it. In this way, the battery module 10 is completed.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  According to the battery module 10 of the present embodiment, heat generated by the plurality of single cells 32 and trapped in the case 11 is radiated through the heat radiation holes 25 provided in the side wall 12 </ b> A of the case 11. That is, external air, for example, flows into the space between the battery units 31 through the heat radiation holes 25 from the side of the stacked body 30 exposed from the heat radiation holes 25 and into the insertion port 71, and between the stacked battery units 31 and the space S. The accumulated heat is pushed out to cool the inside of the case 11.

  At the same time, the heat transferred from the unit cell 32 to the heat transfer plate 60 is promptly transmitted to the entire case 11 from the side wall 12A (shielding portion 12B) of the case 11 in contact with the heat transfer plate 61 through the heat conducting wall 61. Radiated from the entire case 11. At this time, the heat conducting wall 61 is in contact with the side wall 12A (shielding portion 12B) of the case 11 with high contact pressure by the elastic force of the elastic deformation groove provided in the heat transfer plate 60. Excellent.

  Moreover, according to this embodiment, since the unit cell 32 arranged on the upper end portion of the stacked body 30 comes into contact with the projecting surface 20 of the lid portion 18 of the case 11, it is generated by the unit cell 32 at the upper end portion. The transmitted heat is transmitted to the lid 18 and the heat dissipation is further improved.

  Thus, the battery module of this embodiment has high heat dissipation.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above embodiment, the heat radiation holes 25 provided in the case 11 are provided so as to be positioned between the adjacent rows of the heat conduction wall groups 62. However, each heat conduction wall group 62 is exposed to the outside. It is good also as a structure provided in a position. If it does in this way, the heat conductive wall group 62 can be directly cooled by the cooling fin etc., for example. Further, when the surrounding environment when the battery module 10 is used is, for example, a large amount of dust or dirt, the heat conduction wall group 62 blocks the heat radiation hole 25, so that dust or dirt enters the inside of the battery module 10. Can be difficult.

  (2) The position, number, and size of the heat conducting wall 61 and the heat radiating holes 25 are not limited to the above embodiment.

  (3) The shape of the heat radiation hole 25 is not limited to a circle, and may be, for example, an elliptical shape, a long hole shape, or a polygonal shape.

  (4) In the above embodiment, the heat radiation hole 25 is provided at a position where the insertion port 71 of the holding member 40 is exposed to the outside, but it is not necessarily provided at a position where the insertion port 71 is exposed.

  (5) In the said embodiment, although the heat-transfer plate 60 showed the example made from aluminum or aluminum alloy, if it is a heat-transfer plate consisting of a heat conductive material, a constituent material will not be limited.

  (6) In the above embodiment, an example in which the power storage element is a battery has been described, but the power storage element may be a capacitor or the like.

  (7) Although the example used for the battery module 10 for ISG was shown in the above embodiment, it may be used for a battery module for other purposes.

10 ... Battery module (storage module)
11 ... Case 12 ... Case body (Case)
12A ... side wall 12B ... shielding part 18 ... lid part (case)
25 ... Heat radiation hole 30 ... Laminated body 31 ... Battery unit 32 ... Single battery (storage element)
34 (34A, 34B) ... lead terminal 38 ... bus bar 40 ... holding member 60 ... heat transfer plate 61 ... heat conduction wall 62 ... heat conduction wall group 71 ... insertion port S ... space

Claims (5)

A laminate in which a plurality of plate-like electricity storage elements and a plurality of heat transfer plates made of a heat conductive material that conducts heat generated in the electricity storage elements to the outside are laminated;
A metal case containing the laminated body therein,
At the edge of the heat transfer plate, a plurality of heat conduction walls extending in the direction along the stacking direction of the stacked body are provided at intervals from each other,
A power storage module comprising a plurality of heat radiating holes provided on a surface of the case facing the heat conducting wall. The heat transfer wall of the heat transfer plate is provided as a heat transfer wall group provided in a row in the stacking direction of the stacked body and the heat transfer wall of the adjacent heat transfer plate,
The heat radiation hole is provided so as to be positioned between adjacent rows of the heat conducting wall groups, and the heat conducting wall groups are in contact with an inner wall surface of the case. The battery module as described. The heat transfer wall of the heat transfer plate is provided as a heat transfer wall group provided in a row in the stacking direction of the stacked body and the heat transfer wall of the adjacent heat transfer plate,
The power storage module according to claim 1, wherein the heat radiating hole is provided at a position where the heat conducting wall group communicates with the outside of the case. The edge of the opening in the insertion direction of the laminate in the heat dissipation hole is inclined or arcuate with respect to the insertion direction of the laminate. The battery module as described in any one. The storage element has positive and negative lead terminals projecting outward from the end, and the lead terminals having different polarities of the adjacent storage elements are bent in opposite directions and overlapped with each other. Connected by welding,
The storage element is provided with a holding member made of an insulating resin that holds both ends of the storage element, and the holding member has a jig for welding lead terminals having different polarities of the adjacent storage elements, An insertion port that can be inserted from the direction intersecting the protruding direction of the lead terminal is formed,
5. The battery module according to claim 1, wherein the heat radiating hole is provided at a position where the insertion opening communicates with the outside of the case.

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