JP6107442B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module.

  In a power storage module formed by stacking a plurality of power storage elements with lead terminals derived from the end portions, when connecting a plurality of power storage elements, lead terminals having different polarities in adjacent power storage elements are joined. Also, when connecting a detection terminal or a bus bar connected to an external device, the detection terminal or the bus bar is joined to the lead terminal.

  Here, when joining two or more members to one lead terminal by ultrasonic welding when joining between adjacent lead terminals, between a lead terminal and a detection terminal, and between a lead terminal and a bus bar, ultrasonic welding is performed. There is a concern that the vibration caused by this may adversely affect the previously joined portion.

  In order to solve this problem, Patent Document 1 proposes a configuration in which the lead terminals are formed in a strip shape and each member is joined to each lead terminal by ultrasonic welding.

Japanese Patent No. 4462386

  According to the configuration described in Patent Document 1, it is necessary to process the lead terminal into a strip shape. As described above, when the lead terminal is formed in a strip shape, it takes time for processing, and there is a concern that the strength of the lead terminal is lowered.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a power storage module that simplifies connection work between a bus bar, a detection terminal, and a lead terminal.

  In order to solve the above problems, the present invention provides a storage element having a lead terminal at an end, a detection terminal connected to the lead terminal for detecting the state of the storage element, connected to the lead terminal and externally connected. In a power storage module comprising a bus bar electrically connected to a device, a holding member that arranges the detection terminal and the bus bar side by side and holds the lead terminal in a state of being overlapped with the detection terminal and the bus bar The lead terminal, the detection terminal, and the bus bar are made of the same metal material, and the detection terminal and the bus bar are power storage modules that are joined to the lead terminal by laser welding.

  In the present invention, the detection terminal and the bus bar are arranged side by side on the holding member and are held in a state where the lead terminal is overlaid on the holding member, and the detection terminal, the bus bar and the lead terminal are made of the same metal material. Therefore, according to the present invention, the joining of the lead terminal and the bus bar and the joining of the lead terminal and the detection terminal can be performed almost simultaneously by laser welding, and the connection work between the bus bar and the detection terminal and the lead terminal is simplified. be able to.

The present invention may have the following configurations.
The holding member may be provided with a fixing portion for fixing the bus bar and fixing the detection terminal.
With such a configuration, a portion that holds the bus bar and a portion that holds the detection terminal can be provided adjacent to each other, thereby saving space.

The detection terminal, the bus bar, and the lead terminal may be made of aluminum or an aluminum alloy.
With such a configuration, it is possible to reduce the weight of the power storage module.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module which simplified the connection operation | work with a bus bar and a detection terminal and a lead terminal can be provided.

The top view of the electrical storage module of an embodiment Front view of power storage module Side view of power storage module Rear view of power storage module Sectional drawing in the AA line of FIG. Sectional drawing in the BB line of FIG. Sectional view taken along line CC in FIG. Plan view of laminate Rear view of laminate Sectional drawing in the DD line of FIG. Sectional drawing in the EE line of FIG. Perspective view of power storage unit Top view of the uppermost storage unit Plan view of heat transfer member with holding member Sectional drawing in the FF line of FIG. Sectional drawing in the GG line of FIG. Sectional drawing in the HH line of FIG. Plan view of the holding member arranged at the rear of the uppermost stage Sectional drawing in the II line | wire of FIG. Sectional drawing in the JJ line 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.
The power storage module 10 of the present embodiment is used as a power storage module 10 for, for example, Integrated Starter Generator (ISG).

(Storage module 10)
As shown in FIGS. 1 to 3, the power storage module 10 has a substantially rectangular parallelepiped shape as a whole.
As illustrated in FIG. 5, 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.

  In addition, the power storage module 10 includes a power storage element 23, a detection terminal 28 that detects the state of the power storage element 23, and a bus bar 27 that is electrically connected to an external device (not shown).

  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 (detection electric wires) has one end connected to the lead terminal 25 of the electric storage element 23 via the voltage detection terminal 28 (an example of the detection terminal) and the other end connected to a voltage detection connector (not shown). ing.

(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 main body 12, as shown in FIG. An electric wire holding portion 59 provided in the laminate holding member 58 is fitted in the electric wire outlet hole 12B. 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.

  A part of the electric wire holding portion 59 is cut out on the rear side surface of the lid portion 13 so that the electric wire holding portion 59 can be disposed.

  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. 5, 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 in a top view includes 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. 8. The member 31 is placed on the placement surface 31 </ b> A.

  As shown in 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, and has a lead terminal 25 at the end. Specifically, each power storage element 23 includes a power storage element (not shown), a laminate film that wraps the power storage element and has a side edge welded thereto, and an outward direction from an opposite end of the laminate film that is connected to the power storage element and welded. Lead terminals 25 led to

(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 lead terminal 25 is made of aluminum or aluminum alloy. In this embodiment, the lead terminal 25, the voltage detection terminal 28, and the bus bar 27 are made of the same kind of metal material.

  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 superimposed on the voltage detection terminal 28 and the bus bar 27 arranged side by side on the holding member 40, and laser welding is performed. It is joined by.

  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.

(Voltage detection terminal 28)
As shown in FIG. 14, the voltage detection terminal 28 has a rectangular shape when viewed from above. The end of the voltage detection terminal 28 on the side of the crimping part 29 to which the electric wire is crimped is fixed by retaining pieces 50A, 50B of the holding member 40 (see FIG. 13). The voltage detection terminal 28 is made of aluminum or aluminum alloy.

(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 aluminum or aluminum alloy. A portion of the bus bar 27 that is led out from the bus bar outlet 18 of the insulating lid member 17 is a terminal portion 27C that is 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. 12, four heat conduction walls 32 that stand 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. The 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 (see FIG. 6).

  Although details are not illustrated, the heat conduction wall 32 of the present embodiment is bent upward so as to form 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 standing wall portion 32A is in surface contact with the case inner wall surface 12A.

  As shown in FIG. 6, a pair of side edges along the longitudinal direction of the heat transfer member 31 are respectively formed with U-shaped grooves 34 in a cross-sectional view in parallel with the side edges in the longitudinal direction. The heat transfer member 31 comes into contact with the case inner wall surface 12 </ b> A with a high contact pressure by elastically deforming the heat conducting wall 32.

  As shown in FIG. 14, the heat transfer member 31 has two protruding pieces 35 (four in total) 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. ing. 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. 5) 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 member 40 (on the right side in FIG. 5) is 40G, 40H, 40I, 40J, 40K, and 40L in order from the top.

  In the present embodiment, the holding members 40, 40 that overlap in the vertical direction have a structure that engages with each other, although details are not shown.

  In this embodiment, as shown in FIGS. 5 and 10, 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 or the opposite side surface can be inserted into the space S. An insertion slot (not shown) for insertion is used.

  As shown in FIG. 8, 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 FIGS. 18 to 20 is a holding member 40 </ b> A attached to the front of the uppermost power storage unit 22.

  As shown in FIG. 12, each holding member 40 is formed with a concave storage element holding portion 45 into which the corner portion 25B of the wide region 25A 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 FIG. 12, each holding member 40 has a retaining protrusion 46 for retaining the heat transfer member 31 upward (corresponding to the outer peripheral edge of the power storage element 23 (battery container 24)). Projecting in the thickness direction). As shown in FIG. 12, a stopper claw 46A 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 FIG. 14, each holding member 40 has 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 of the power 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.

  As shown in FIG. 18, the terminal holding part 50 has a concave shape so that the voltage detection terminal 28 can be fitted therein. The terminal holding portion 50 is provided with a pair of retaining pieces 50A and 50B that retain and fix the end of the voltage detection terminal 28 on the side connected to the electric wire.

  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 FIGS. 12 and 18, the bus bar holding portion 52 has a recessed portion 53 into which the bus bar 27 is fitted, and a plurality of (four) retaining members that prevent the bus bar 27 fitted into the recessed portion 53 from coming off. A convex portion 54 is formed. The retaining projection 54 includes a retaining projection 54A that is integrated with the retaining piece 50A described above and the other retaining projection 54B.

  In the holding members 40A and 40F, the terminal holding part 50 and the bus bar holding part 52 are formed side by side. In the holding member 40A, as shown in FIG. 20, in the present embodiment, one retaining piece 50A provided on the terminal retaining portion 50 and a retaining projection 54A are provided with a fixing portion 62 formed on the front and back sides. Is provided. That is, the fixing part 62 is a member that fixes the bus bar 27 and also fixes the voltage detection terminal 28. Such a configuration saves space compared to separately providing a member for fixing the voltage detection terminal 28 and a member for fixing the bus bar 27 at adjacent positions.

  The holding members 40 </ b> A and 40 </ b> G arranged on the uppermost stage are formed with fixing protrusions 55 that fix the stacked body 21 in the case 11. The fixed protrusion 55 is formed to protrude upward, contacts the inner wall surface of the lid 13, and fixes the laminated body 21 in the case 11.

  A 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, as shown in FIG. 13, a concave locking recess 57 for locking the laminated body holding member 58 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.
In the laminated body 21, as shown in FIG. 9, the electric wire passing part 56A in which the slit was formed in the center, and the hole-shaped electric wire passing part 56B are located in a line. 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 are routed together in an electric wire holding portion 59 provided in the laminate holding member 58. .

(Laminated body holding member 58)
The laminated body holding member 58 is a member that holds the laminated body 21 in a laminated state, and is arranged between the connection portion 26 of the lead terminal 25 arranged on the rear end face side of the laminated body 21 and the case 11, and leads The terminal 25 is covered over the entire area for insulation protection.

  As shown in FIG. 7, the laminate holding member 58 includes a pair of sandwiching portions 58A that sandwich the laminate 21 from the stacking direction (vertical direction) of the power storage module 10, and a connecting portion 58B that connects the pair of sandwiching portions 58A. have. The holding portion 58A is provided with a locking piece 60 formed with a locking claw portion 61 that fits into a locking recess 57 provided in the holding members 40G and 40L (laminate 21) (an example of a locking structure). ).

  The laminated body holding member 58 is provided with a wire holding portion 59 that projects from the wire passing portion 56 of the holding member 40G. The electric wire holding part 59 is formed with a slit into which the electric wire 30 can be inserted. As shown in FIG. 4, the electric wire holding portion 59 is fitted in an electric wire outlet hole 12 </ b> B formed at the upper end of the rear side surface of the case body 12.

(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.

  Next, the voltage detection terminal 28 and the bus bar 27 are attached to a predetermined position of the heat transfer member 31 having the holding members 40 attached to both side edges (see FIG. 14).

  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. When the voltage detection terminal 28 comes into contact with the pair of retaining pieces 50A and 50B of the terminal holding portion in the operation of housing the voltage detection terminal 28 in the terminal holding portion 50, the retaining pieces 50A and 50B are bent and deformed outward. To do. When the voltage detection terminal 28 is disposed below the retaining pieces 50A and 50B, the retaining pieces 50A and 50B are elastically restored, and the voltage detection terminal 28 is fixed at the terminal holding portion 50.

  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 projections 54A and 54B come into contact with each other, and the retaining projections 54A and 54B are bent and deformed outward. When the bus bar 27 is fitted in the recess 53, the retaining protrusions 54 are elastically restored to restrict the upward movement of the bus bar 27 and enter a retaining state.

  In the holding member 40A to which the voltage detection terminal 28 and the bus bar 27 are attached, the voltage detection terminal 28 and the bus bar 27 are held side by side.

  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. 12 and 13). 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 protrusions 46 are provided corresponding to the corners 24 </ b> A of the battery container 24, so that the electric 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. To do.

  By placing the storage element 23 on the heat transfer member 31, the holding member 40 </ b> A is held in a state where the lead terminals 25 are superimposed on the voltage detection terminals 28 and the bus bars 27 in a side-by-side state. When the lead terminal 25, the voltage detection terminal 28, and the lead terminal and the bus bar 27 held by the holding member 40 are joined by laser welding, the power 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. However, in the present embodiment, since 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, the heat transfer member 31 is stacked when the power storage units 22 are stacked from the bottom to the top. Is displaced.

  In the present embodiment, since the retaining member 46 is provided with the retaining protrusion 46, the retaining member 46 is prevented from coming off even if the heat transfer member 31 is largely displaced.

  When the six power storage units 22 are stacked, the holding members 40 and 40 that overlap in the stacking direction are engaged and integrated with each other, and the stacked body 21 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 the 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 opposite to the mounting surface 31 </ b> A of the heat transfer member 31 is adjacent in the stacking direction ( It is in surface contact with the storage element 23 (which is disposed below).

  Next, a welding jig is inserted into the space S from the insertion port 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 into 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 formed electric wire 30 is inserted into the electric wire holding part 59 of the laminated body 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 laminated body 21 is placed on the bottom wall portion of the case main body 12, the heat conduction wall 32 of the heat transfer member 31 is elastically restored, and stands above the heat conduction wall 32. The wall portion 32A is arranged so as to be in surface contact with the case inner wall surface 12A (see FIG. 6). And the electric wire 30 inserted in the electric wire holding part 59 is guide | induced to the outer side of the case main body 12 from the electric wire extraction hole 12B.

  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 voltage detection terminal 28 and the bus bar 27 are arranged side by side on the holding member 40 and held in a state where the lead terminal 25 is superimposed on the voltage detection terminal 28, the bus bar 27, and the lead terminal 25. Are made of the same kind of metal material. Therefore, according to the present embodiment, the joining of the lead terminal 25 and the bus bar 27 and the joining of the lead terminal 25 and the voltage detection terminal 28 can be performed almost simultaneously by laser welding. Connection work with the terminal 25 can be simplified.

  In addition, according to the present embodiment, the holding member 40 is provided with the fixing portion 62 that fixes the bus bar 27 and fixes the voltage detection terminal 28, and thus the bus bar holding portion 52 that holds the bus bar 27 and The terminal holding part 50 which holds the voltage detection terminal 28 can be provided adjacently, which saves space.

  Further, according to the present embodiment, since the voltage detection terminal 28, the bus bar 27, and the lead terminal 25 are made of aluminum or an aluminum alloy, the power storage module 10 can be reduced in weight.

<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 lead terminal 25 connected to the power storage element and led out from the end portion of the case 11 is shown, but may be a lead terminal attached to the end portion outside the case.
(2) In the above-described embodiment, the fixing part 62A is provided in which the retaining piece 50A for retaining and fixing the detection terminal 28 and the retaining protrusion 54A for retaining and fixing the bus bar 27 are integrated. The member for fixing and the member for fixing the bus bar may be formed separately.
(3) Although the bus bar 27 made of aluminum or aluminum alloy, the voltage detection terminal 28, and the lead terminal 25 are shown in the above embodiment, these may be made of the same kind of metal, for example, made of copper or copper alloy. It may be.
(4) In the above embodiment, an example of the voltage detection terminal 28 that detects a voltage as the detection terminal 28 has been described. However, the detection terminal may detect a temperature.

DESCRIPTION OF SYMBOLS 10 ... Power storage module 21 ... Laminate body 22 ... Power storage unit 23 ... Power storage element 25 ... Lead terminal 27 ... Bus bar 28 ... Voltage detection terminal 30 ... Electric wire (detection electric wire)
40 ... Holding member 50 ... Terminal holding part 50A ... Retaining piece (fixing part)
50B: Retaining piece 51 ... Electric wire receiving groove 52 ... Bus bar holding portion 53 ... Recess portion 54 ... Retaining convex portion 54A ... Retaining convex portion (fixed portion)
54B ... Retaining convex part 62 ... Fixing part

Claims (4)

A storage element having a substantially rectangular shape when viewed from above and having a lead terminal protruding from an end portion on the short side of the rectangular shape, a detection terminal connected to the lead terminal and detecting the state of the storage element, and the lead terminal In a power storage module comprising a bus bar that is connected to and electrically connected to an external device,
While arranging the detection terminal and the bus bar side by side, the detection terminal and the bus bar are provided with a holding member that holds the lead terminal in an overlaid state,
The lead terminal, the detection terminal and the bus bar are made of the same kind of metal material,
The power storage module, wherein the detection terminal is arranged side by side with the bus bar adjacent to the width direction of the bus bar, which is a protruding direction of the lead terminal . The power storage module according to claim 1, wherein the holding member is provided with a fixing portion that fixes the bus bar and fixes the detection terminal. The power storage module according to claim 1, wherein the detection terminal, the bus bar, and the lead terminal are made of aluminum or an aluminum alloy. A storage element having a substantially rectangular shape when viewed from above and having a lead terminal protruding from an end portion on the short side of the rectangular shape, a detection terminal connected to the lead terminal and detecting the state of the storage element, and the lead terminal And a bus bar electrically connected to an external device, and the lead terminal, the detection terminal, and the bus bar are manufacturing methods of a power storage module made of the same kind of metal material,
The detection terminal is arranged side by side with the bus bar adjacent to the width direction of the bus bar, which is the protruding direction of the lead terminal, and the detection terminal and the bus bar are overlapped with the lead terminal. Holding the terminal, the bus bar, and the lead terminal in a holding member;
A method for manufacturing a power storage module, wherein the detection terminal and the bus bar are joined to the lead terminal by laser welding in a state of being held by the holding member.

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