JP5974983B2 - Power storage module - Google Patents

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 an electrical storage module by connecting two or more. As such a power storage module, for example, the one described in Patent Document 1 is known.

JP 2008-147047 A

  Patent Document 1 discloses a power storage module in which a plurality of power storage elements in which positive and negative lead terminals protrude from end portions are stacked. In this power storage module, adjacent power storage elements are connected in series by connecting lead terminals having different polarities (reverse polarities).

  In the power storage module described in Patent Document 1, in order to prevent a short circuit between the lead terminals, an insulating plate is disposed on both sides of the lead terminals and sandwiched. Therefore, in this power storage module, the power storage elements adjacent in the stacking direction are arranged in a separated state by the thickness dimension of the insulating plate.

  In a power storage module in which a plurality of power storage elements are stacked as in the power storage module of Patent Document 1, heat generated from the power storage elements may become high due to repeated charging and discharging. 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 which improved heat dissipation.

As a method for improving the heat dissipation of the power storage module, it is conceivable to arrange a heat transfer member made of a heat conductive material between power storage elements adjacent in the stacking direction.
Here, when the insulating member such as an insulating plate for holding the power storage element and the heat transfer member are separately (separately) arranged in the power storage element, the member is displaced due to vibration or the like. Are preferably integrated.

  When the insulating member and the heat transfer member are integrated and a plurality of power storage units in which the power storage element is placed and held on the heat transfer member are stacked, the sum of the thickness dimension of the power storage element and the heat transfer member is If it is the same as the thickness dimension of the insulating member, the contact area between the heat transfer member and the power storage element of the power storage units adjacent in the stacking direction is increased. However, since the thickness of the power storage element varies due to manufacturing tolerances, there is a case where the contact area between the heat transfer member and the power storage element adjacent in the stacking direction is small. In such a case, there was a concern that the heat dissipation of the electricity storage device would be reduced.

As a result of intensive studies in view of the above circumstances, the present invention has been achieved.
That is, the present invention includes a power storage element in which a lead terminal protrudes from a side edge, a holding member that holds the side edge of the power storage element, and a mounting surface on which the power storage element is mounted. A heat transfer member that conducts the generated heat to the outside, and the heat transfer member stacks a plurality of power storage units attached to the holding member in a state in which the heat transfer member can be displaced in the thickness direction of the power storage element. It is a power storage module.

  In this invention, the heat-transfer member is attached with respect to the holding member in the state which can be displaced to the thickness direction of an electrical storage element. Therefore, according to the present invention, since the heat transfer member is displaced in accordance with the thickness of the power storage element, variations due to manufacturing tolerances are absorbed, so that the heat transfer member of the power storage unit adjacent to the stacking direction is in contact with the power storage element. The area is increased and heat dissipation is improved.

The present invention may have the following configurations.
The holding member may be formed with a retaining protrusion for retaining the heat transfer member.
With such a configuration, even if the heat transfer member is greatly displaced in the thickness direction of the power storage element, it is possible to prevent the heat transfer member from being pulled out by the retaining protrusion provided on the holding member.

The heat transfer member may be attached to the holding member so as to be displaced within a range in which the heat transfer member does not contact the lead terminal of the power storage element adjacent in the stacking direction.
The heat transfer member may be made of a metal material having thermal conductivity. In such a case, there is a concern that a short circuit may occur due to contact with the lead terminal of the power storage element. Therefore, with the above configuration, the range in which the heat transfer member is displaced can be a range that does not come into contact with the lead terminals of the adjacent power storage elements in the stacking direction, which is caused by the contact between the heat transfer member and the lead terminals. The occurrence of a short circuit can be prevented.

Either one of the heat transfer member and the holding member may be provided with an attachment protrusion that protrudes in the thickness direction of the power storage element, and the other may be provided with an attachment hole that receives the attachment protrusion. Good.
With such a configuration, a structure for attaching the heat transfer member to the holding member can be provided only by providing the attachment protrusion and the attachment hole, and the structure can be simplified.

The retaining protrusion may be formed corresponding to the outer peripheral edge of the power storage element.
With such a configuration, the retaining protrusion also functions as a positioning portion for the power storage element when the power storage element is placed on the heat transfer member.

  An object of the present invention is to provide a power storage module with improved heat dissipation.

The top view of the electrical storage module of an embodiment Front view of power storage module Side view of power storage module Sectional drawing in the AA line of FIG. Sectional drawing in the BB line of FIG. Plan view of laminate Side view of laminate Sectional drawing in the CC line of FIG. Perspective view of power storage unit Top view of power storage unit Sectional drawing in the DD line of FIG. Plan view of heat transfer member with holding member Plan view of heat transfer member Sectional drawing in the EE line of FIG. A perspective view of a holding member attached to the front of the uppermost power storage unit Top view of the holding member attached to the rear of the uppermost power storage unit Front view of the holding member of FIG.

<Embodiment 1>
The power storage module 10 of Embodiment 1 will be described with reference to FIGS. In the following description, the left side in FIG. 1 is the front, the right side is the rear, the upper side in FIG. 3 is the upper side, and the lower side is the lower side.
The power storage module 10 of the present embodiment is used as a power storage module 10 for, for example, Integrated Starter Generator (ISG).

(Power storage module 10)
As shown in FIGS. 1 to 3, the power storage module 10 has a substantially rectangular parallelepiped shape as a whole. A plurality of electric wires 30 connected to the lead terminals 25 of the respective electric storage elements 23 are led out to the outside from the front side surface and the rear side surface (surfaces arranged on the left and right in FIG. 1) of the electric storage module 10. Each of the plurality of electric wires 30 has one end connected to the lead terminal 25 of the storage element 23 via the voltage detection terminal 28 and the other end connected to a voltage detection connector (not shown).

  As shown in FIG. 4, the power storage module 10 includes a plurality of power storage elements 23 (six power storage elements 23 in the present embodiment), holding members 40 respectively attached to both ends of each power storage element 23, and a stacking direction ( A heat transfer member 31 disposed between the power storage elements 23 adjacent in the vertical direction) and a metal case 11 for housing them.

(Case 11)
The case 11 includes a case main body 12 that houses the stacked body 21 of the power storage units 22, and a lid portion 13 that covers the upper surface of the case main body 12. The case body 12 has an upper surface and a front side surface that are open. At the upper end of the rear side surface of the case body 12, a wire lead-out hole (not shown) for leading the plurality of wires 30 out of the case 11 is formed. An insulating lid member 17 is attached to the front opening of the case body 12.

  At the center position of the upper surface of the lid portion 13, a protruding surface 13 </ b> A that protrudes inward (downward direction) is formed. A buffer material 20 is disposed between the protruding surface 13A of the lid 13 and the uppermost (first from the top) power storage element 23. By attaching the lid portion 13 to the case main body 12, the cushioning material 20 pushes and fixes the laminated body 21, protects the laminated body 21 from vibrations and shocks, and presses each power storage element 23.

  A fixing hole in which a first fixing member (not shown) for fixing the lid part 13, the laminated body 21, and the case body 12 is arranged on the upper surface of the lid part 13 outside the protruding surface 13 </ b> A. 14 is formed through.

  Further, on the upper surface of the lid portion 13, a rectangular lid locking hole 15 is formed penetratingly formed on the front end side. The lid locking hole 15 has a function of locking the insulating lid member 17 attached to the front side.

  As shown in FIG. 2, a bus bar outlet 18 through which the positive and negative bus bars 27 are led out is formed in the insulating lid member 17 attached to the opening on the front side of the case body 12.

  As shown in FIG. 2, a substantially rectangular cutout 19 for leading out the plurality of electric wires 30 is provided at the lower end of the insulating lid member 17. The insulating lid member 17 not only covers the opening of the case body 12 but also has a function of insulating and protecting the lead terminals 25 disposed on the front end face side of the stacked body 21.

(Laminate 21)
As shown in FIG. 4, a laminated body 21 is accommodated in the case 11. In the present embodiment, the stacked body 21 is formed by stacking a plurality of power storage units 22 each having a power storage element 23 mounted on a heat transfer member 31 to which a holding member 40 is attached. The power storage unit 22 configuring the stacked body 21 includes a power storage element 23, a holding member 40, and a heat transfer member 31.

(Storage element 23)
In the power storage unit 22, the power storage element 23 having a substantially rectangular shape when viewed from above has a pair of edges in the short side direction held by the holding member 40 and heat transfer attached to the holding member 40, as shown in FIG. 6. The member 31 is placed on the placement surface 31 </ b> A.

  As shown in FIG. 6 and FIG. 8, each power storage element 23 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 member 31 and is excellent in heat dissipation. The power storage elements 23 adjacent in the stacking direction are arranged so that the lead terminals 25 having different polarities face each other.

  Each power storage element 23 is a laminate type battery. Each power storage element 23 projects outwardly from a power generation element (not shown), a laminate film that encloses the power generation element and has a side edge welded thereto, and is connected to the power generation element and is opposed to the opposite end of the laminate film welded thereto. Lead terminal 25. The laminate film is the battery container 24 of the electricity storage element 23.

(Lead terminal 25)
The lead terminals 25 having different polarities of the adjacent power storage elements 23 are not shown in detail, but are bent in directions opposite to each other except for the positive electrode lead terminal 25 of the uppermost power storage element 23 and the negative electrode lead terminal 25 of the lowermost stage. At the same time, the ends are connected so as to be in contact with each other so as to be in contact with each other.

  The positive electrode lead terminal 25 of the uppermost power storage element 23 and the negative electrode lead terminal 25 of the lowermost power storage element 23 are directly overlapped and connected to the voltage detection terminal 28 and the bus bar 27.

  The region on the end side of the laminate film of the lead terminal 25 is a wide region 25A that is wider than the region on the end side, and the corner 25B of the wide region 25A is fitted into the power storage element holding unit 45 of the holding member 40. The movement of the storage element 23 is regulated.

(Bus bar 27)
The bus bar 27 (first bus bar 27A) connected to the uppermost power storage element 23 is a terminal that functions as the positive electrode of the power storage module 10, and the bus bar 27 connected to the lowermost power storage element 23 is connected to the power storage module 10. This is a terminal (second bus bar 27B) that functions as a positive electrode. Each bus bar 27 is made of a conductive material such as pure aluminum, aluminum alloy, copper or copper alloy, and a portion led out from the bus bar outlet 18 of the insulating lid member 17 is a terminal portion 27C connected to an external device.

(Heat transfer member 31)
The heat transfer member 31 is a member made of a heat conductive material, and is disposed between adjacent power storage elements 23. 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 member 31, as shown in FIG. 9, four heat conduction walls 32 erected upward are formed at intervals. The heat conducting wall 32 is disposed so as to come into contact with the case inner wall surface 12 </ b> A when the laminated body 21 is accommodated in the case 11, and has a function of conducting heat generated from the power storage element 23 to the case 11. Heat generated from the storage element 23 is transmitted to the case 11 through the heat conducting wall 32 and is radiated to the outside of the case 11.

  As shown in FIG. 14, the heat conducting wall 32 of the present embodiment has an obtuse angle with respect to the placement surface 31A (the upper surface of the heat transfer member 31) on which the power storage element 23 is placed (the angle θ in FIG. 14). The wall portion 32A that is bent upward is formed in a straight line so as to be in surface contact with the inner wall surface 12A of the case.

  As shown in FIG. 13 and FIG. 14, a pair of side edges along the longitudinal direction of the heat transfer member 31 are formed with grooves 34 having a U-shaped cross-section in parallel with the side edges in the longitudinal direction. Yes. The heat transfer member 31 is configured to contact the power storage element 23 with the case inner wall surface 12 </ b> A with a high contact pressure by elastically deforming the heat conducting wall 32 (see FIG. 5).

  As shown in FIG. 13, the heat transfer member 31 has two protruding pieces 35 each having attachment holes 36 formed on both side edges in the short side direction so as to be displaceably attached to the holding member 40 (four in total). Have. The protruding piece 35 is provided at a position facing the protruding piece 35.

  A mounting protrusion 47 of the holding member 40 described later is fitted into the mounting hole 36 of the heat transfer member 31. The heat transfer member 31 is attached to the holding member 40 in a state displaceable in the thickness direction (vertical direction) of the power storage element 23. The heat transfer member 31 is displaced within a range in which the heat transfer member 31 is not in contact with the lead terminals 25 of the power storage elements 23 adjacent in the stacking direction.

  A positioning protrusion 37 that is positioned with respect to the holding member 40 is provided between the two protruding pieces 35 of the heat transfer member 31.

(Holding member 40)
Both side edges of the electricity storage element 23 placed on the placement surface 31A of the heat transfer member 31 are held by a holding member 40 made of insulating resin. Two holding members 40 are attached to each power storage unit 22 (12 power storage modules 10 as a whole). When distinguishing the twelve holding members 40, the holding member 40 in front of the power storage module 10 (left side in FIG. 4) is set to 40A, 40B, 40C, 40D, 40E, 40F in order from the top, and the rear of the power storage module 10 The holding members (on the right side in FIG. 4) are 40G, 40H, 40I, 40J, 40K, and 40L in order from the top.

  In the present embodiment, of the holding members 40, 40 that overlap in the vertical direction, one holding member 40 is formed with an engaging claw 41 that locks the other holding member 40, and the other holding member 40 has An engagement receiving portion 42 that receives the engagement claw 41 is provided. The engaging claw 41 and the engagement receiving portion 42 are structured to engage each other. The holding members 40 adjacent in the vertical direction are engaged at two positions (see FIGS. 6 and 7).

  In the present embodiment, as shown in FIGS. 7 and 8, when a plurality of power storage units 22 are stacked, a space S is formed between the holding members 40, 40 adjacent in the vertical direction (stacking direction). It has become.

  In the space S between the holding members 40 adjacent to each other in the vertical direction, connection portions 26 (not shown) of the lead terminals 25 having different polarities adjacent to each other are arranged in the vertical direction. In this space S, a jig (not shown) for welding adjacent lead terminals 25 having different polarities can be inserted, and the side surface of the holding member 40 shown in FIG. Is inserted into the space S.

  As shown in FIGS. 15 and 16, each holding member 40 is provided with two through holes 44 through which the first fixing member can be inserted. Here, the holding member 40 shown in FIG. 15 is a holding member 40A attached to the front of the uppermost storage unit 22, and the holding member 40 shown in FIG. 16 is a holding member 40G attached to the rear of the uppermost storage unit 22. is there.

  As shown in FIGS. 15 and 16, each holding member 40 is formed with a concave storage element holding portion 45 into which the corner portion 25 </ b> B of the wide region 25 </ b> A of the lead terminal 25 is fitted. The lead terminal 25 (power storage element 23) is restricted from moving by the power storage element holding unit 45.

  As shown in FIGS. 9 and 10, each holding member 40 has a retaining protrusion 46 that prevents the heat transfer member 31 from falling upward (corresponding to the outer peripheral edge of the storage element 23 (battery container 24)). It protrudes in the thickness direction of the electricity storage element 23. As shown in FIG. 9, a stopper claw 46 </ b> A that protrudes toward the heat transfer member 31 is formed at the upper end of the stopper protrusion 46. The position of the retaining pawl 46 </ b> A is a position that allows the heat transfer member 31 to be displaced within a range in which the heat transfer member 31 does not come into contact with the lead terminal 25 of the adjacent storage element 23 in the stacking direction.

  As shown in FIGS. 15 and 17, each holding member 40 is formed with an attachment protrusion 47 that fits into the attachment hole 36 of the heat transfer member 31 so as to protrude in the thickness direction (upward direction) of the electricity storage element 23. The mounting protrusion 47 has a rectangular shape when viewed from above. A positioning recess 49 for receiving the positioning projection 37 of the heat transfer member 31 is provided between the two mounting projections 47 of each holding member 40.

  Each holding member 40 is provided with a terminal holding part 50 for holding the voltage detection terminal 28 and a wire receiving groove 51 for receiving the electric wire 30 connected to the voltage detection terminal 28. A crimping portion 29 that is crimped by the voltage detection terminal 28 of the wire 30 is also held in the wire receiving groove 51.

  Furthermore, the holding member 40A disposed in front of the uppermost power storage unit 22 and the holding member 40F disposed in front of the lowermost power storage unit 22 are also provided with bus bar holding portions 52 that hold the bus bars 27, respectively. ing. As shown in FIG. 15, the bus bar holding portion 52 is formed with a recess 53 into which the bus bar 27 is fitted, and a plurality of retaining projections 54 that prevent the bus bar 27 fitted into the recess 53 from coming off. ing.

  The holding members 40 </ b> A and 40 </ b> G arranged on the uppermost stage are each formed to protrude upward, and a fixing protrusion 55 that fixes the stacked body 21 in the case 11 is formed.

At the end of each holding member 40, an electric wire passage portion 56 through which the electric wire 30 is passed is provided.
The electric wires 30 passed through the electric wire passing portions 56 of the holding members 40G, 40H, 40I, 40J, 40K, and 40L arranged on the rear side are routed together in an electric wire holding portion 59 provided in the laminate holding member 58. . The electric wire holding portion 59 is disposed so as to protrude out of the case 11 from an electric wire outlet hole formed at the upper end of the rear side surface of the case main body 12. A plurality of electric wires 30 are led out of the case 11 from the electric wire outlet holes.

  In addition, the laminated body holding member 58 is attached to the holding member 40G arranged at the rear of the uppermost stage. Specifically, in the holding member 40G, a concave locking portion (locking recess 57) for locking the laminated body holding member 58 is formed.

  The multilayer body holding member 58 is disposed between the connection portion 26 of the lead terminal 25 disposed on the rear end face side of the multilayer body 21 and the case 11 to insulate and protect the lead terminal 25. The laminated body holding member 58 is formed with a locking claw portion (not shown) that fits into the locking recess 57.

(Assembly method of power storage module 10 of this embodiment)
Next, a method for assembling the power storage module 10 of this embodiment will be described. A total of six power storage elements 23 including lead terminals 25 having a predetermined shape are prepared.
Corresponding holding members 40 are respectively attached to both side edges of the six heat transfer members 31. The operation of attaching the holding member 40 to the heat transfer member 31 is performed as follows. The positioning protrusion 37 of the heat transfer member 31 is disposed in the positioning recess 49 of the holding member 40, and the protruding piece 35 of the heat transfer member 31 is disposed in the protruding piece receiving portion provided in the holding member 40. The attachment protrusion 47 of the holding member 40 is fitted into the attachment hole 36 of the 31.

  When the heat transfer member 31 comes into contact with the retaining protrusion 46 of the holding member 40, the retaining protrusion 46 bends and deforms, and when the heat transfer member 31 is arranged below the retaining claws 46A, the retaining protrusion. 46 is elastically restored, and the heat transfer member 31 is prevented from being detached from the holding member 40.

  Next, the voltage detection terminal 28 and the bus bar 27 are attached to a predetermined position of the heat transfer member 31 to which the holding member 40 is attached on both side edges (see FIG. 12).

  The operation of attaching the voltage detection terminal 28 can be performed by fitting the voltage detection terminal 28 into the terminal holding portion 50 of the holding member 40 and attaching the voltage detection terminal 28 to accommodate the electric wire 30 in the electric wire accommodation groove 51.

  The bus bar 27 is attached as follows. When the bus bar 27 is inserted into the recessed portion 53 of the bus bar holding portion 52, the bus bar 27 and the retaining projection 54 come into contact with each other, and the retaining projection 54 bends and deforms outward. When the bus bar 27 is fitted in the recessed portion 53, the retaining projection 54 is elastically restored, restricting the upward movement of the bus bar 27 and becoming a retaining state.

Next, the electrical storage unit 22 is obtained by mounting the electrical storage element 23 on the mounting surface 31A of each heat transfer member 31 (see FIGS. 9 and 10). When the power storage element 23 is placed on the heat transfer member 31, the four corners 24 </ b> A of the battery container 24 of the power storage element 23 are arranged so as to correspond to the retaining protrusions 46. In the present embodiment, the retaining protrusion 46 is provided corresponding to the corner 24A (outer peripheral edge) of the battery container 24 (power storage element 23), so that the power storage element 23 can be easily positioned.
The power storage element 23 positioned with respect to the heat transfer member 31 is mounted on the mounting surface 31A of the heat transfer member 31 so that the corner portion 25B of the lead terminal 25 fits into the power storage element holding portion 45 of each holding member 40. Then, the electrical storage unit 22 is obtained.

  Next, the power storage units 22 are stacked from the bottom to the top. Here, since there is a manufacturing tolerance in the thickness dimension of the power storage element 23, the sum of the thickness dimension of the power storage element 23 and the thickness dimension of the heat transfer member 31 may not be the same as the thickness dimension of the holding member 40. Since the heat transfer member 31 of this embodiment is attached to the holding member 40 so as to be displaceable in the thickness direction of the power storage element 23, the heat transfer member 31 is displaced when the power storage units 22 are stacked from the bottom to the top. (See FIG. 8).

  Here, if the heat transfer member 31 is displaced too much upward, for example, the heat transfer member 31 comes out of the holding member 40, but in this embodiment, the holding member 40 is provided with a retaining protrusion 46, The heat transfer member 31 is prevented from coming off.

  Further, the position of the retaining claw 46A of the holding member 40 is a position that allows the heat transfer member 31 to be displaced in a range that does not come into contact with the lead terminals 25 of the adjacent power storage elements 23 in the stacking direction. Even if the displacement amount is large, the lead terminals 25 of the power storage elements 23 adjacent in the vertical direction are not in contact with each other.

  When the six power storage units 22 are stacked, one engagement claw 41 and the other engagement receiving portion 42 of the holding member 40 that overlap in the stacking direction are mutually engaged and integrated, and FIGS. A laminate 21 as shown is obtained. At this time, the through holes 44 of the holding members 40 stacked in six steps overlap to form one through hole, and a space S is formed between the adjacent holding members 40.

  In this laminated body 21, the manufacturing tolerance is absorbed by the heat transfer member 31 being displaced in the thickness direction of the power storage element 23, and the surface 31B opposite to the mounting surface 31A of the heat transfer member 31 is adjacent in the stacking direction. It comes into surface contact with the matching (disposed below) storage element 23.

  Next, a welding jig is inserted into the space S from the insertion port 43 between the holding members 40 adjacent in the vertical direction, and the ends of the two adjacent lead terminals 25 are joined in the vertical direction. Adjacent the two lead terminals 25 by sandwiching a portion where the end portions of the lead terminals 25 are overlapped with each other in a direction intersecting the protruding direction of the lead terminals 25, and welding by irradiating with laser light. The lead terminals 25 having different polarities are connected to each other.

  The laminated body holding member 58 is attached to the rear end face side of the laminated body 21 obtained in this way, and the laminated body 21 is held.

Next, the electric wire 30 is inserted into the electric wire passage portion 56, the electric wire 30 inserted through the electric wire passage portion 56 of the front holding member 40 is routed downward, and is inserted into the electric wire passage portion 56 of the rear holding member 40. The electric wire 30 is inserted into the electric wire holding portion 59 of the laminate holding member 58.
Next, the laminated body 21 is accommodated in the case main body 12 while the electric wire holding portion 59 of the laminated body holding member 58 is fitted into the electric wire outlet hole 12 </ b> B of the case main body 12. When the laminated body 21 is accommodated in the case main body 12, the heat conducting wall 32 of the heat transfer member 31 is elastically deformed. When the laminated body 21 is placed on the bottom wall portion of the case main body 12, the heat conducting wall 32 is elastic. The wall portion 32A that returns and rises above the heat conducting wall 32 is arranged so as to be in surface contact with the case inner wall surface 12A (see FIG. 5).

  Next, the insulating lid member 17 is attached to the opening on the front side of the case body 12. Specifically, the electric wire 30 led out from the front side of the laminated body 21 is led out from the notch 19 of the insulating lid member 17, and the bus bar 27 is led out from the bus bar outlet 18 of the insulating lid member 17. The lid member 17 is attached to the case body 12. Next, when the lid 13 is placed so as to cover the upper surface of the case main body 12, the power storage module 10 as shown in FIG. 1 is obtained.

  Next, in the state where the first fixing member is passed through the through hole 44 of the holding member 40 arranged at the end of the laminated body 21 between the lid portion 13 and the bottom wall portion of the case body 12, After inserting the fixing hole 14 of the lid part 13, the hollow first fixing member and the fixing hole (not shown) of the bottom wall part of the case main body 12 into the jig to be aligned, a screw or a pin is used. The lid portion 13 and the case main body 12 are fixed. In this way, the power storage module 10 is completed.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.
In the present embodiment, the heat transfer member 31 is attached to the holding member 40 so as to be displaceable in the thickness direction of the power storage element 23. Therefore, according to the present embodiment, since the heat transfer member 31 is displaced according to the thickness of the power storage element 23 and variations due to manufacturing tolerances are absorbed, the heat transfer member 31 of the power storage unit 22 adjacent in the stacking direction The contact area with the power storage element 23 is increased, and heat dissipation is improved.

  Further, according to the present embodiment, since the retaining member 40 is formed with the retaining protrusion 46 that prevents the heat transfer member 31 from being detached, the heat transfer member 31 is largely displaced in the thickness direction of the power storage element 23. In addition, it is possible to prevent the heat transfer member 31 from coming off by the retaining projection 46 provided on the holding member 40.

  In addition, according to the present embodiment, the heat transfer member 31 is attached to the holding member 40 so as to be displaced within a range in which the heat transfer member 31 does not come into contact with the lead terminals 25 of the storage elements 23 adjacent in the stacking direction. The range in which the heat member 31 is displaced can be a range that does not come into contact with the lead terminals 25 of the power storage elements 23 adjacent in the stacking direction, and the occurrence of a short circuit due to the contact between the heat transfer member 31 and the lead terminals 25 is prevented. can do.

  Further, according to the present embodiment, the holding member 40 is provided with the mounting protrusion 47 that protrudes in the thickness direction of the power storage element 23, while the heat transfer member 31 is provided with the mounting hole 36 that receives the mounting protrusion 47. Therefore, the structure for attaching the heat transfer member 31 to the holding member 40 can be provided only by providing the attachment protrusion 47 and the attachment hole 36, and the structure can be simplified.

  Furthermore, according to the present embodiment, the retaining protrusion 46 is formed corresponding to the outer peripheral edge of the power storage element 23, and therefore the retaining protrusion 46 places the power storage element 23 on the heat transfer member 31. Sometimes, it also functions as a positioning portion of the electricity storage element 23, and positioning becomes easy.

<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-described embodiment, the holding member 40 having the retaining protrusion 46 that prevents the heat transfer member 31 from being removed has been shown. However, a holding member having no retaining protrusion may be used.
(2) In the embodiment described above, the holding members 40 are shown in which the four retaining protrusions 46 are formed corresponding to the outer peripheral edge of the power storage element 23, but the number of retaining protrusions is other than four ( For example, it may be 1 to 3, 5 or more), or may be formed at a position not corresponding to the outer peripheral edge of the power storage element.
(3) In the above embodiment, the position of the retaining pawl 46A provided at the upper end of the retaining projection 46 can be displaced within a range in which the heat transfer member 31 does not contact the lead terminal 25 of the storage element 23 adjacent in the stacking direction. Although the example set to the position is shown, the heat transfer member is displaced with respect to the holding member by a method other than the retaining claw 46A in a range in which it does not contact the lead terminals of the storage elements adjacent in the stacking direction. It is good also as a structure attached to.
(4) In the above embodiment, the holding member 40 is provided with the mounting protrusion 47 that protrudes in the thickness direction of the power storage element 23, and the heat transfer member 31 is provided with the mounting hole 36 that receives the mounting protrusion 47. Although shown, an attachment hole may be provided in the holding member, and an attachment protrusion that fits into the attachment hole may be provided in the heat transfer member.
(5) In the above embodiment, the heat transfer member 31 provided with the heat conductive wall 32 in contact with the case inner wall surface 12 </ b> A is shown, but may be a heat transfer member provided with no heat conductive wall.
(6) In the said embodiment, although the heat-transfer member 31 showed the example made from aluminum or aluminum alloy, if it is a heat-transfer member consisting of a heat conductive material, a constituent material will not be limited.
(7) In the above embodiment, the example in which the power storage element 23 is a battery has been described. However, the power storage element may be a capacitor or the like.
(8) Although the example used for the ISG power storage module 10 has been described in the above embodiment, it may be used for a power storage module for other purposes.

DESCRIPTION OF SYMBOLS 10 ... Power storage module 11 ... Case 21 ... Laminated body 22 ... Livestock electric power unit 23 ... Power storage element 24 ... Battery container (laminate film)
24A ... Corner portion of battery case (outer peripheral edge of power storage element)
25 ... Lead terminal 25A ... Wide region 25B ... Corner portion (of wide region) 27 ... Bus bar 31 ... Heat transfer member 31A ... Mounting surface 32 ... Heat conduction wall (standing wall)
35 ... Projection piece 36 ... Mounting hole 37 ... Positioning projection 40 ... Holding member 41 ... Engaging claw 42 ... Engagement receiving portion 46 ... Retaining prevention projection 46A ... Retaining prevention claw 47 ... Mounting projection 48 ... Top

Claims (5)

A power storage element in which a lead terminal protrudes from a side edge;
A holding member for holding a side edge of the power storage element;
A heat transfer member that has a mounting surface on which the power storage element is mounted and that conducts heat generated from the power storage element to the outside , wherein the heat transfer member is battery module in the power storage unit mounted in the displaceable state in the thickness direction formed by stacking a plurality.   The power storage module according to claim 1, wherein a retaining protrusion that prevents the heat transfer member from being detached is formed on the holding member.   The power storage module according to claim 2, wherein the retaining protrusion is formed corresponding to an outer peripheral edge of the power storage element.   4. The heat transfer member according to claim 1, wherein the heat transfer member is attached so as to be displaced with respect to the holding member in a range in which the heat transfer member does not contact the lead terminal of the power storage element adjacent in the stacking direction. The electricity storage module described.   One of the heat transfer member and the holding member is provided with a mounting protrusion that protrudes in the thickness direction of the power storage element, and the other is provided with a mounting hole that receives the mounting protrusion. The electrical storage module as described in any one of Claims 1 thru | or 4.

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