JP2014086272A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module capable of preventing short circuit while improving connection reliability.SOLUTION: A power storage module comprises: a laminate body 30 formed by laminating plural power storage elements 32 having positive electrode and negative electrode lead terminals 34 projecting in an outside direction from ends 33B; and holding members mounted to the ends 33B of the power storage elements 32 and holding the power storage elements 32. Among the holding members overlaid on each other in laminating the power storage elements 32, an engaging part 41 is provided on one of the holding member, and an engaged part 42 engaged with the engaging part 41 is provided on the other holding member.

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

  Patent Document 1 discloses a battery module formed by laminating a plurality of unit cells from which positive and negative lead terminals protrude from an end portion. In this battery module, adjacent unit cells are connected in series by connecting lead terminals having different polarities (reverse polarities).

  In the battery module described in Patent Document 1, in order to prevent a short circuit between the lead terminals, an insulating plate is arranged and sandwiched on both sides of the lead terminals. If they are shifted due to the above, there is a concern that the connection state between the lead terminals deteriorates or a short circuit occurs.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide a power storage module that improves connection reliability and prevents occurrence of a short circuit.

  In order to solve the above problems, the present invention provides a laminate in which a plurality of power storage elements each having a positive electrode and a negative electrode lead terminal projecting outward from an end are stacked, and attached to the end of the power storage element A holding member that holds the power storage element, and among the holding members that overlap when the power storage elements are stacked, one holding member has an engaging portion, and the other holding member has It is an electrical storage module provided with the to-be-engaged part engaged with the said engaging part.

  In the present invention, of the holding members that overlap when the power storage elements are stacked, one holding member is provided with an engaging portion, and the other holding member is provided with an engaged portion that is engaged with the engaging portion. ing. That is, in the present invention, when the power storage element having the holding member attached to the end portion is stacked, the power storage module overlaps with the engagement portion of one holding member engaged with the engaged portion of the other holding member. Even when subjected to vibration or the like, the holding member is hardly displaced. As a result, according to the present invention, the connection state between the lead terminals is not deteriorated, and the occurrence of a short circuit due to contact with other lead terminals can be prevented, so that the connection reliability is improved and the occurrence of the short circuit is achieved. It is possible to provide a power storage module that prevents the above.

The present invention may have the following configurations.
The engaging part and the engaged part may be shaped to fit each other. With such a configuration, when the holding members are stacked, the engaging portion of one holding member and the engaged portion of the other holding member are fitted to save space.

The overlapping holding members may be engaged with each other at two or more locations.
Such a configuration is preferable because the holding member can be reliably prevented from shifting.

The storage device further includes a detection terminal that detects a state of the storage element and is connected to a lead terminal of the storage element. The holding member includes the detection terminal, and one surface of the detection terminal is a surface of the lead terminal. There may be provided a terminal holding portion for holding at a position that is on the same line as or a position that bites into the surface of the lead terminal.
With such a configuration, when the detection terminal is held in the terminal holding portion of the holding member and the power storage element is arranged, the detection terminal and the lead terminal are in surface contact, so the power storage element and the detection terminal Connection reliability can be improved.

The storage element is connected to a connection member that is electrically connected to an external device, while the holding member is connected to the connection member, and one surface of the connection member is on the same line as the surface of the lead terminal. Alternatively, a connection member holding portion that holds the lead terminal at a position that bites into the surface thereof may be provided.
With such a configuration, when the storage element is arranged with the connection member held in the connection member holding portion, the connection member and the lead terminal are in surface contact, so the connection reliability between the storage element and the connection member is improved. Can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module which raised connection reliability and prevented generation | occurrence | production of a short circuit can be provided.

The perspective view of the electrical storage module of Embodiment 1 Perspective view of laminate Plan view of laminate Side view of laminate Sectional drawing in the AA line of FIG. Front view of laminate Sectional drawing in the BB line of FIG. Plan view of battery unit Sectional drawing in the CC line of FIG. Plan view of battery unit Sectional drawing in the DD line of FIG. The perspective view which shows a mode that the heat exchanger plate was attached to the holding member from the back side The principal part expansion perspective view of FIG. The top view which shows a mode that the terminal for a detection has been arrange | positioned to the holding member which attached the heat exchanger plate The top view which shows a mode that the terminal for a detection and the connection member were arrange | positioned to the holding member which attached the heat exchanger plate

<Embodiment 1>
A first 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 side in FIG. 4 is the front, the right side is the rear, the upper side in FIG. 4 is the upper side, and the lower side is the lower side.
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. A plurality of electric wires 65 connected to the lead terminals 34 of each unit cell 32 (an example of a power storage element) are respectively connected 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 battery module 10. Has been derived. One end of each of the plurality of electric wires 65 is connected to the lead terminal 34 of the unit cell 32 via a plate-shaped voltage detection terminal 66 (an example of a detection terminal), and the other end is connected to a voltage detection output connector 64 (hereinafter “ Connector 64 ").

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

  As shown in FIG. 4, the battery module 10 includes a stacked body 30 in which a plurality of unit cells 32 (six unit cells 32 in this embodiment) are stacked, and a metal case 11 that houses the stacked body 30. And comprising.

(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 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 65 out of the case 11 is formed. An insulating lid member 26 is attached to the front opening of the case body 12.

  As shown in FIG. 1, the lid portion 18 includes a substantially rectangular plate-like portion 19, and a fixing portion 23 that is connected substantially vertically downward to the plate-like portion 19 and is fixed to the upper end portion of the case body 12. Prepare. 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 can be brought into contact with the uppermost unit cell 32 (the first step from the top). When the projecting surface 20 of the lid portion 18 and the unit cell 32 come into 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, a fixing hole 21 in which a first fixing member (not shown) for fixing the lid portion 18, the laminated body 30, and the case main body 12 is disposed outside the protruding surface 20. 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 has a substantially circular shape, and a plurality (three) 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 overlaid on a pair of side surfaces (surfaces disposed on the front side and the back side in FIG. 1) and the outer side of the rear side surface of the case body 12.

  Bus bar outlets 29B and 29B from which a bus bar 38 (an example of a connecting member) is led are formed in the insulating lid member 26 attached to the opening on the front side of the case body 12.

  As shown in FIG. 1, 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.

(Laminated body 30)
As shown in FIGS. 2 to 4, the case 11 accommodates a stacked body 30 formed by stacking a plurality of unit cells 32. In the present embodiment, the stacked body 30 is formed by stacking a plurality of unit cells 32 (hereinafter referred to as “battery units 31”) placed on a heat transfer plate 60 to which the holding member 40 is attached.

(Single cell 32)
As shown in FIG. 3, in the battery unit 31, the unit cell 32 having a substantially rectangular shape when viewed from above has a pair of edges in the short side direction held by a holding member 40 and heat transfer attached to the holding member 40 It is placed on the plate 60.

  8 is a diagram showing the battery unit 31 in the third stage from the top, FIG. 10 is a diagram showing the battery unit 31 in the sixth stage from the top, and FIG. 14 is a battery in the third stage from the top. It is a figure which shows the assembly procedure of the unit 31, and FIG. 15 is a figure which shows the assembly procedure of the battery unit 31 of the 6th step | paragraph from the top.

  As shown in FIGS. 8 and 10, each single battery 32 is arranged substantially in parallel with a surface 33 </ b> A having a large area among the outer surfaces arranged vertically. As a result, the surface 33A having a large area comes into contact with the heat transfer plate 60 and is excellent in heat dissipation. The unit cells 32 that are adjacent in the stacking direction are arranged so that the lead terminals 34 having different polarities face each other.

  Each unit cell 32 is a laminate type battery. Each cell 32 includes a power generation element (not shown), a laminate film 33 that encloses the power generation element and has an end 33B welded thereto, and opposite end portions 33B and 33B that are connected to the power generation element and have the laminate film 33 welded thereto. And a lead terminal 34 protruding outward.

(Lead terminal 34)
The lead terminals 34 and 34 having different polarities of the adjacent unit cells 32 and 32 are opposite to each other except for the negative electrode lead terminal 34 of the first-stage unit cell 32 from the top and the positive electrode lead terminal 34 of the sixth stage from the top. And are connected by overlapping and welding so that the end portions are in contact with each other (see FIG. 6).

  Specifically, as shown in FIG. 9, the lead terminal 34 </ b> B protruding outward from one end 33 </ b> B of the unit cell 32 is bent substantially vertically upward after passing through the side-arc-shaped protrusion 36. The end portion has a J-shape when viewed from the side. A lead terminal 34B (not shown) protruding from the other end portion 33B is bent substantially vertically downward after passing through a projecting portion 36 having a side view arc shape, and the end portion has a J-shape in side view. Yes. That is, although not shown in detail, the lead terminals 34B projecting outward from one edge 33B of the unit cells 32 arranged in the second to fifth stages from the top, and projecting outward from the other edge 33B. The lead terminals 34B are bent in opposite directions.

  Lead terminals 34A other than the lead terminal 34B (terminal connection terminal 34B) connected to the lead terminal 34B of the adjacent unit cell (the first negative lead terminal 34A from the top and the sixth positive lead lead terminal 34A from the top) Are formed with U-shaped protrusions 35 when viewed from the side, and in these terminals, portions (ends) closer to the ends than the U-shaped protrusions 35 are substantially parallel to the protruding direction (linear shape). ).

  These lead terminals 34A (the negative electrode lead terminal 34A of the unit cell 32 at the first stage from the top and the positive electrode lead terminal 34A of the unit cell 32 at the sixth stage from the top) are directly superimposed on the voltage detection terminal 66 and the bus bar 38. Connected (bus bar connection terminal 34A).

Although not shown in detail, the negative lead terminal 34 of each unit cell 32 is directly overlapped with and connected to the voltage detection terminal 66.
The arc-shaped protrusion 36 formed on the lead terminal 34B has a function of relieving stress received by the lead terminal 34B when welding the lead terminals 34B and 34B. The U-shaped protrusion 35 formed on the lead terminal 34A has a function of relieving stress applied to the lead terminal 34A when the lead terminal 34A and the bus bar 38 are connected.

  As shown in FIGS. 9 and 11, each lead terminal 34 protrudes in the vertical direction between the end 33 </ b> B of the laminate film 33 and the protrusions 35 and 36, and is engaged with the holding member 40. A stop convex portion 37 is formed.

  A region 34 a on the end 33 B side of the laminate film of the lead terminal 34 is a wide region 34 a wider than the region 34 b on the end side, and a corner 34 c of the wide region 34 a is formed on the unit cell holding portion 51 of the holding member 40. The movement of the unit cell 32 is regulated by fitting.

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

(Heat transfer plate 60)
In the present embodiment, a heat transfer plate 60 made of aluminum or aluminum alloy is disposed between the adjacent single cells 32, 32. On the pair of side edges in the longitudinal direction of the heat transfer plate 60, as shown in FIG. 2, four standing walls 61 that stand upward 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.

  On the inner side of the pair of side edges in the longitudinal direction of the heat transfer plate 60, as shown in FIG. 12, a convex portion 62A projecting downward in FIG. 12 substantially parallel to the side edges in the longitudinal direction, and in FIG. Recesses 62B protruding upward are alternately formed. From the edge of the laminate film 33 that covers the unit cell 32, the metal coating material disposed inside the laminate film 33 may be exposed, but the protrusion 62 </ b> A formed on the heat transfer plate 60 and The recess 62 </ b> B prevents the edge of the laminate film 33 of the unit cell 32 from contacting the heat transfer plate 60. Thereby, the short circuit of the cell 32 is prevented.

  As shown in FIGS. 12 and 13, the heat transfer plate 60 has two protruding pieces 63 each having a locking hole 63 </ b> A formed on both side edges in the short side direction (four in total). By sliding the heat transfer plate 60 with respect to the holding member 40, the heat transfer plate locking portion 44 of the holding member 40 is locked in the locking hole 63 </ b> A of the heat transfer plate 60.

(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 member 40 is arranged on each of the opposing end portions 33B and 33B from which the lead terminal 34 of the unit cell 32 is projected.

  In the present embodiment, among the holding members 40 that overlap in the vertical direction, one holding member 40 is formed with a locking claw 41A that protrudes toward the other holding member 40 and protrudes in the inner direction. An engaging protrusion 41 (an example of an engaging part) is provided, and the other holding member 40 has a recessed shape for receiving the engaging protrusion 41 and a locking protrusion 42A for locking the locking claw 41A. An engagement receiving portion 42 (an example of an engaged portion) in which is formed is provided. The engaging protrusion 41 and the engagement receiving portion 42 are structured to engage with each other. Specifically, it is as follows.

  Engaging protrusions 41 are respectively provided on the two side surfaces of the holding member 40B disposed in front of the second stage from the top, while the two side surfaces of the holding member 40A disposed in front of the first stage from the top. Are provided with engagement receiving portions 42 that mutually engage with the engagement protrusions 41 provided on the holding member 40B in the second stage from the top (see FIGS. 4 and 5).

  Two engaging protrusions 41 are provided on the front side surface of the holding member 40C arranged in front of the third step from the top, while the front side surface of the holding member 40B arranged in front of the second step from the top. Is provided with an engagement receiving portion 42 that mutually engages with each of the engagement protrusions 41 provided on the holding member 40C in the third step from the top (see FIGS. 6 and 7).

  Engaging protrusions 41 are respectively provided on the two side surfaces of the holding member 40D arranged in front of the fourth step from the top, while the two side surfaces of the holding member 40C arranged in front of the third step from the top Are provided with engagement receiving portions 42 that are engaged with the engagement protrusions 41 provided on the holding member 40D in the fourth stage from the top (see FIGS. 4 and 5).

  Two engaging protrusions 41 are provided on the front side surface of the holding member 40E arranged in front of the fifth step from the top, while on the front side surface of the holding member 40D arranged in front of the fourth step from the top. Are provided with engagement receiving portions 42 that mutually engage with the respective engagement protrusions 41 provided on the front holding member 40E at the fifth stage from the top (see FIGS. 6 and 7).

  Engaging protrusions 41 are respectively provided on the two side surfaces of the holding member 40F arranged in front of the sixth step from the top, while the two side surfaces of the holding member 40E arranged in front of the fifth step from the top Are provided with engagement receiving portions 42 that mutually engage with the engagement protrusions 41 provided on the holding member 40F in the sixth step from the top (see FIGS. 4 and 5).

  Two engaging protrusions 41 are provided on the rear side surface of the holding member 40H arranged at the rear of the second stage from the top, while on the rear side surface of the holding member 40G arranged at the rear of the first stage from the top. Is provided with an engagement receiving portion 42 that mutually engages with each of the engagement protrusions 41 provided on the holding member 40H at the second stage from the top (see FIG. 7).

  Engaging protrusions 41 are provided on the two side surfaces of the holding member 40I arranged at the rear of the third step from the top, respectively, while the two side surfaces of the holding member 40H arranged at the rear of the second step from the top are provided. Are provided with engagement receiving portions 42 that mutually engage with the engagement protrusions 41 provided on the holding member 40I at the rear of the third row from the top (see FIG. 4).

  Two engaging protrusions 41 are provided on the rear side surface of the holding member 40J arranged at the rear of the fourth stage from the top, while the rear side surface of the holding member 40I arranged at the rear of the third stage from the top is provided. Is provided with an engagement receiving portion 42 that mutually engages with each of the engagement protrusions 41 provided on the holding member 40J at the rear of the fourth stage from the top (see FIG. 7).

  Engaging protrusions 41 are respectively provided on the two side surfaces of the holding member 40K disposed at the rear of the fifth step from the top, while the two side surfaces of the holding member 40J disposed at the rear of the fourth step from the top Are provided with engagement receiving portions 42 that mutually engage with the engagement protrusions 41 provided on the holding member 40K at the rear of the fifth stage from the top (see FIG. 4).

  Two engaging protrusions 41 are provided on the rear side surface of the holding member 40L disposed at the rear of the sixth stage from the top, while the rear side surface of the holding member 40K disposed at the rear of the fifth stage from the top. Are provided with engagement receiving portions 42 that mutually engage with the respective engagement protrusions 41 provided on the holding member 40L at the rear of the sixth stage from the top (see FIG. 7).

  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 part 42 do not protrude to the outside of the holding member 40 and are space-saving.

  Each of the second to fifth holding members 40B, 40C, 40D, 40E, 40H, 40I, 40J, and 40K from the top has two engagement protrusions 41 and two engagement receiving portions 42, respectively. ing. That is, the second to fifth holding members 40B, 40C, 40D, 40E, 40H, 40I, 40J, and 40K from the top are engaged with the holding member 40 that is overlaid at two locations, and the bottom Is engaged with the holding member 40 arranged at two locations.

  The holding members 40A and 40G in the first stage from the top each have two engagement receiving portions 42, and are engaged with the holding members 40B and 40H arranged below at two locations. The holding members 40F and 40L in the sixth stage from the top each have two engaging protrusions 41 and are engaged at two locations with the holding members 40E and 40K stacked on top.

Moreover, in this embodiment, as shown in FIG. 2 and FIG. 7, when a plurality of battery units 31 are stacked, a space S is formed between the holding members 40, 40 adjacent in the vertical direction as shown in FIG. 4. Is supposed to be formed,
Specifically, the lower side surface of the holding member 40B disposed in front of the second stage from the top and the upper side surface of the holding member 40C disposed in front of the third stage from the top are both recessed. When the two holding members 40B and 40C are overlapped, a space S penetrating substantially parallel to the short side direction of the laminate film 33 of the unit cell 32 is formed between the holding members 40B and 40C.

  Similarly, the holding member 40G disposed between the holding member 40D disposed in front of the fourth stage from the top and the holding member 40E disposed in front of the fifth stage from the top, and the rear of the first stage from the top. And a holding member 40H arranged behind the third stage from the top, a holding member 40I arranged behind the third stage from the top, and a holding member 40J arranged behind the fourth stage from the top A space S is also formed between the holding member 40K arranged at the rear of the fifth stage from the top and the holding member 40L arranged at the rear of the sixth stage from the top.

  In the space S between the holding members 40 adjacent to each other in the vertical direction, connection portions 36B of the 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 holding member 40 on the side surface or the back side in FIG. The side surface is an insertion port 71 for inserting the jig into the space S.

  Each holding member 40 is provided with two through holes 43 through which the first fixing member can be inserted. On the lower surface of each holding member 40, a heat transfer plate locking portion 44 that is locked in the locking hole 63A of the heat transfer plate 60 is provided (see FIG. 13).

  A terminal arrangement part 45 for arranging and holding the lead terminals 34 is formed on the upper side surface of each holding member 40. The terminal arrangement part 45 receives and engages with a locking projection 37 of the lead terminal 34. A locking groove 46 for stopping is provided (see FIGS. 9 and 11). The locking groove 46 has a function of locking the lead terminal 34 and positioning the unit cell 32.

  A thick area 52 having a thickness dimension larger than that of the terminal arrangement section 45 is provided in an area adjacent to the terminal arrangement section 45 of each holding member 40, and the wide area 34 a of the lead terminal 34 is provided in the thick area 52. A concave unit cell holding portion 51 into which the corner portion 34c of the second portion is fitted is formed. The movement of the lead terminal 34 (unit cell 32) is restricted by the unit cell holding portion 51.

  The holding members 40C, 40E, 40H, and 40J include an insulating wall portion 54 that surrounds the periphery of the connecting portion 36A that connects the lead terminals 34 and prevents and insulates the other connecting portions 36A and other lead terminals 34 from contacting each other. (See FIG. 2 and the like).

  The holding members 40A, 40C, 40E, 40F, 40H, 40J, and 40L each include a terminal holding portion 47 that holds the voltage detection terminal 66 and an electric wire that houses the electric wire 65 connected to the voltage detection terminal 66. A housing groove 48 is provided. A crimping portion 65 </ b> A crimped by a voltage detection terminal 66 of the electric wire 65 is also held in the electric wire receiving groove 48.

  As shown in FIGS. 9 and 11, the upper surface (one surface) of the voltage detection terminal 66 held in the terminal holding portion 47 of each of the holding members 40A, 40C, 40E, 40F, 40H, 40J, and 40L is a lead terminal. 34 is held at a position that is on the same line (on the XX line and on the YY line) with the lower surface (an example of the surface).

  Furthermore, the holding members 40A and 40F are each provided with a bus bar holding portion 49 (an example of a connection member holding portion) that holds the bus bar 38. The bus bar holding portion 49 is formed with a recessed portion 49A into which the bus bar 38 is fitted, and a plurality of retaining projections 49B that retain the bus bar 38 fitted into the recessed portion 49A.

  As shown in FIG. 11, the upper surface (one surface) of the bus bar 38 held by the bus bar holding portion 49 of the holding members 40A and 40F is collinear with the lower surface (an example of the surface) of the lead terminal 34 (YY On the line).

  Each holding member 40 is formed with an electric wire passage portion 53 through which an electric wire 65 attached to the holding member 40 or another holding member 40 is passed. The wire passing portion 53 of the holding member 40 other than the holding member 40G arranged at the rear of the first stage from the top is a groove-like portion in which a part of the holding member 40 is cut out, and is accommodated in the case 11. The electric wire passing portion 53 of the holding member 40G 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 65 are led out of the case 11 from the electric wire passage portion 53 of the holding member 40G.

  In the holding members 40F and 40L in the sixth stage from the top, the locking grooves 46 are provided only on the upper surface, but in the other holding members 40, the locking grooves 46 are provided on the upper and lower surfaces, respectively.

  Further, the holding member 40G arranged at the rear of the first stage from the top has a locking hole 50A for locking a laminated body holding member (not shown) and an attachment recess 50B to which the laminated body holding member is attached. , Provided. The multilayer body holding member is disposed between the connection portion 36 </ b> A of the lead terminal 34 disposed on the rear end face side of the multilayer body 30 and the case 11, and insulates and protects the lead terminal 34.

(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. A total of six unit cells 32 including lead terminals 34 having a predetermined shape are prepared.

  The holding members 40 corresponding to the end portions of the six heat transfer plates 60 are respectively attached. Specifically, the heat transfer plate 60 with the holding member 40A and the holding member 40G attached, the heat transfer plate 60 with the holding member 40B and the holding member 40H attached, the heat transfer plate 60 with the holding member 40C and the holding member 40I attached, heat transfer plate 60 with holding member 40D and holding member 40J attached, heat transfer plate 60 with holding member 40E and holding member 40K attached, heat transfer plate 60 with holding member 40F and holding A member to which the member 40L is attached is produced. The operation of attaching the holding member to the heat transfer plate 60 is performed by sliding the heat transfer plate 60 with respect to the holding member 40 and attaching the heat transfer plate locking portion 44 of the holding member 40 to the locking hole 63A of the heat transfer plate 60. It can be executed by locking.

  Next, the voltage detection terminal 66 to which the connector 64 is connected and the bus bar 38 are attached to predetermined positions of the heat transfer plate 60 to which the holding member 40 is attached two by two.

  Specifically, the electric wire 65 connected to the connector 64 is accommodated in the electric wire accommodation groove 48 of the holding members 40A, 40C, 40E, 40H, 40J, 40F, and 40L, and the bus bar holding portion 49 of the holding members 40A and 40F Each bus bar 38 is attached (see FIGS. 14 and 15).

  The attachment work of the electric wire 65 connected to the connector 64 can be performed by fitting the voltage detection terminal 66 into the terminal holding portion 47 of the holding member 40 and attaching the electric wire 65 in the electric wire accommodation groove 48.

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.

  When the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40A and the holding member 40G are attached, the first-stage battery unit 31A from the top is obtained. When the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40B and the holding member 40H are attached, the battery unit 31B in the second stage from the top is obtained. When the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40C and the holding member 40I are attached, a battery unit 31C in the third stage from the top is obtained. When the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40D and the holding member 40J are attached, a battery unit 31D in the fourth stage from the top is obtained. When the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40E and the holding member 40K are attached, the battery unit 31E at the fifth stage from the top is obtained. When the unit cell 32 is placed on the heat transfer plate 60 to which the holding member 40F and the holding member 40L are attached, the sixth-stage battery unit 31F from the top is obtained.

  When the single battery 32 is placed on the heat transfer plate 60, the locking projections 37 of the lead terminals 34 are fitted in the locking grooves 46 of the terminal arrangement portions 45, and the corners 33 c of the lead terminals 34. However, the unit cell 32 is placed on the heat transfer plate 60 so as to fit into the unit cell holding part 51 of each holding member 40. Then, the lead terminal 34 of the cell 32 is locked by the locking groove 46, thereby preventing the position shift of the cell 32 and the movement of the cell 32 is restricted by the cell holding part 51.

  Since the insulating wall portion 54 of the holding member 40 is disposed at the periphery of the connecting portion 36A between the adjacent lead terminals 34, 34, the connecting portion 36A between the adjacent lead terminals 34, 34 is also held in an insulated state. Is done.

  In each battery unit 31, the upper surface of the voltage detection terminal 66 held by the terminal holding portion 47 of the holding member 40 and the lower surface of the lead terminal 34 of the unit cell 32 are arranged on the same line, and the voltage detection terminal 66. And the lead terminal 34 are in surface contact (see FIGS. 9 and 11). In particular, in the battery units 31 </ b> A and 31 </ b> F, the upper surface of the voltage detection terminal 66 held by the terminal holding portion 47 of the holding member 40, the upper surface of the bus bar 38, and the lower surface of the lead terminal 34 of the unit cell 32 are the same. Arranged on the line, the voltage detection terminal 66 and the bus bar 38 are in surface contact with the lead terminal 34 (see FIG. 11).

  When the voltage detection terminal 66 and the bus bar 38 are joined to the lead terminal 34 by laser welding, the battery unit 31 is 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 disposed on the upper side is moved downward, the engaging projection 41 is fitted into the engagement receiving portion 42, and the locking claw 41 </ b> A of the engagement protruding portion 41 is within the engagement receiving portion 42. When contacting the locking projection 42A, 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. 2 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. 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 rear side of the laminated body 30 is led out from the electric wire outlet hole formed in the upper end of the rear side surface of the case main body 12, and the laminated body 30 is accommodated in the case main body 12. When the laminated body 30 is accommodated in the case main body 12, the heat conducting wall 61 is arranged so as to contact the inner wall surface 12 </ b> A of the case main body 12.

  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, in the state where the first fixing member is passed through the through hole 43 of the holding member 40 arranged at the end of the laminated body 30 between the lid portion 18 and the bottom wall portion of the case main body 12. After inserting the fixing hole 21 of the lid portion 18, the hollow first fixing member and the fixing hole of the bottom wall portion of the case main body 12 into the jig not to be aligned, the lid portion 18 is The case body 12 is fixed. 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.
In this embodiment, when the unit cells 32 having the holding members 40 attached to the end portions are stacked, the engagement protrusions 41 of the other holding member 40 are engaged with the engagement receiving portions 42 of the one holding member 40. Therefore, even if the battery module 10 receives vibration or the like, the holding member 40 is hardly displaced. As a result, according to the present embodiment, the connection state between the lead terminals 34 does not deteriorate, and the occurrence of a short circuit due to contact with other lead terminals 34 can be prevented, so that the connection reliability is improved. The battery module 10 that prevents the occurrence of a short circuit can be provided.

In addition, according to the present embodiment, the engagement receiving portion 42 and the engagement protrusion 41 have a shape that fits into each other, so that space is saved.
In particular, according to the present embodiment, since the overlapping holding members 40 are engaged with each other at two or more places, the holding member 40 can be reliably prevented from being displaced.

  Further, in the present embodiment, the battery further includes a voltage detection terminal 66 that detects the state of the unit cell 32 and is connected to the lead terminal 34A of the unit cell 32, and the holding member 40 includes the voltage detection terminal 66 as the voltage detection terminal. A terminal holding portion 47 is provided that holds one surface of 66 at a position that is collinear with the surface of the lead terminal 34A. Therefore, according to the present embodiment, when the voltage detection terminal 66 is held in the terminal holding portion 47 of the holding member 40 and the unit cell 32 is disposed, the voltage detection terminal 66 and the lead terminal 34A are in surface contact. Therefore, the connection reliability between the cell 32 and the voltage detection terminal 66 can be improved.

  Further, in the present embodiment, a bus bar 38 that is electrically connected to an external device is connected to the unit cell 32, while the holding member 40 is connected to the bus bar 38, and one surface of the bus bar 38 is the surface of the lead terminal 34A. And a bus bar holding portion 49 for holding at a position on the same line. Therefore, according to the present embodiment, when the single battery 32 is disposed with the bus bar 38 held in the bus bar holding portion 49, the bus bar 38 and the lead terminal 34 </ b> A are in surface contact with each other. Connection reliability can be improved.

<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 example in which the engaging portion and the engaged portion are provided with the holding member 40 having a shape that fits into each other has been shown, but the engaging portion and the engaged portion are not limited to this. One or both of the engaging portion and the engaged portion may protrude from the overlapped holding member.
(2) In the above embodiment, the example in which the holding members 40 that overlap each other are engaged with each other at two locations is shown. However, the holding members 40 may be engaged at other than three locations, or may be engaged at one location. Also good.
(3) In the above embodiment, the voltage detection terminal 66 is connected to the unit cell 32 and the electric wire receiving groove 48 is formed in the holding member 40. However, the present invention is not limited to this. A temperature detection terminal may be connected to the unit cell together with the voltage detection terminal. In addition, the holding member may be provided with an electric wire housing portion that accommodates the electric wire connected to the temperature detection terminal, the electric wire connected to the voltage detection terminal in the electric wire housing portion of the holding member, and the electric wire connected to the temperature detection terminal. May be accommodated together.
(4) In the above-described embodiment, an example is shown in which one surface of the voltage detection terminal 66, one surface of the bus bar 38, and the surface of the lead terminal 34 are arranged on the same line, but one surface of the voltage detection terminal is the surface of the lead terminal. If arranged on the same line, one surface of the bus bar may not be arranged on the same line as the surface of the lead terminal. Further, the bus bar and the voltage detection terminal may be arranged on the same line as the different surfaces of the two surfaces of the lead terminal.
Furthermore, one surface of the voltage detection terminal and one surface of the bus bar may be arranged so as to bite into the surface of the lead terminal.
(5) 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.
(6) Although the example used for the battery module 10 for ISG was shown in the said embodiment, you may use for the battery module of another use.

10 ... Battery module (storage module)
30 ... Laminated body 31 ... Battery unit 32 ... Single battery (storage element)
33 ... Laminate film 33B ... End of unit cell 34 (34A, 34B) ... Lead terminal 38 ... Bus bar (connection member)
38A ... second bus bar 38B ... first bus bar 40 ... holding member 40A ... holding member disposed in front of the first step from the top 40B ... holding member disposed in front of the second step from the top 40C ... three steps from the top Holding member 40D arranged in front of the eye 40D ... Holding member arranged in front of the fourth stage from the top 40E ... Holding member arranged in front of the fifth stage from the top 40F ... arranged in front of the sixth stage from the top Holding member 40G ... Holding member 40H arranged behind the first stage from the top 40H ... Holding member arranged behind the second stage from the top 40I ... Holding member 40J arranged behind the third stage from the top ... Holding member 40K arranged behind the fourth stage from the top 40K ... Holding member arranged behind the fifth stage from the top 40L ... Holding member arranged behind the sixth stage from the top 41 ... engaging protrusion (Engagement part)
41A ... Locking claw 42 ... Engagement receiving part (engaged part)
42A ... Locking protrusion 47 ... Terminal holding part 49 ... Bus bar holding part (connection member holding part)
49A ... Depression 49B ... Retaining protrusion 65 ... Electric wire 66 ... Voltage detection terminal (detection terminal)

Claims (5)

A laminated body formed by laminating a plurality of power storage elements having positive and negative lead terminals projecting outward from the ends; and
A holding member that is attached to an end of the power storage element and holds the power storage element;
Of the holding members that overlap when the power storage elements are stacked, one holding member is provided with an engaging portion, and the other holding member is provided with an engaged portion that is engaged with the engaging portion. Power storage module. The power storage module according to claim 1, wherein the engaging portion and the engaged portion have shapes that fit into each other. The power storage module according to claim 1 or 2, wherein the overlapping holding members are engaged with each other at two or more locations. Further comprising a detection terminal connected to the lead terminal of the electricity storage element while detecting the state of the electricity storage element,
The holding member is provided with a terminal holding portion for holding the detection terminal at a position where one surface of the detection terminal is collinear with the surface of the lead terminal, or a position where the detection terminal bites into the surface of the lead terminal. The power storage module according to any one of claims 1 to 3. While the storage element is connected to a connection member that is electrically connected to an external device,
The holding member is provided with a connection member holding portion that holds the connection member at a position where one surface of the connection member is collinear with the surface of the lead terminal or a position where the connection member bites into the surface of the lead terminal. The power storage module according to any one of claims 1 to 4.

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