阅读说明：本技术 柔性印制电路板、布线部件、蓄电模块以及连接模块 (Flexible printed circuit board, wiring component, power storage module, and connection module ) 是由 高桥秀夫 高濑慎一 中岛英明 于 2019-09-11 设计创作，主要内容包括：本发明提供一种柔性印制电路板(40),其具备多个导电电路(42),在与蓄电元件(21)的电极端子(22)连接的导电部件(30)突出设置的连接突片(34)的连接突部(36)被连接到多个导电电路(42),柔性印制电路板具备：多个插入开口(51),其形成为比连接突部(36)的外形大,连接突部(36)能够以在连接突部(36)周围具备间隙的状态插通于插入开口(51)；以及多个进入开口(52),其以连接突部(36)能够从插入开口(51)进入的方式与各插入开口(51)对应设置,以比插入开口(51)窄的方式延伸,导电电路(42)具备位于进入开口(52)的缘部(53)且连接突部(36)被连接的焊盘(60)。(The present invention provides a flexible printed circuit board (40) which is provided with a plurality of conductive circuits (42), wherein a connecting protrusion (36) of a connecting protrusion piece (34) which is arranged on a conductive member (30) connected with an electrode terminal (22) of an electric storage element (21) in a protruding manner is connected to the plurality of conductive circuits (42), and the flexible printed circuit board is provided with: a plurality of insertion openings (51) formed larger than the outer shape of the connection protrusion (36), the connection protrusion (36) being insertable into the insertion openings (51) with a gap provided around the connection protrusion (36); and a plurality of inlet openings (52) which are provided corresponding to the respective insertion openings (51) so that the connection protrusions (36) can enter from the insertion openings (51) and extend so as to be narrower than the insertion openings (51), wherein the conductive circuit (42) is provided with a pad (60) which is located at an edge (53) of the inlet openings (52) and to which the connection protrusions (36) are connected.)

1. A flexible printed circuit board having a plurality of conductive circuits, to which a protrusion provided to protrude from a conductive member connected to an electrode terminal of an electric storage element is connected, the flexible printed circuit board comprising:

a plurality of insertion openings formed larger than the outer shape of the projection, the projection being insertable into the insertion openings with a gap provided around the projection; and

a plurality of entry openings provided corresponding to the respective insertion openings so that the projections can enter from the insertion openings, the entry openings extending in a plate surface direction of the flexible printed circuit board so as to be narrower than the insertion openings,

the conductive circuit includes a pad located at an edge of the inlet opening and to which the protrusion is connected.

2. The flexible printed circuit board according to claim 1,

the entrance openings extend in the same direction from the insertion opening such that the directions of extension of the plurality of entrance openings are all the same.

3. The flexible printed circuit board according to claim 1 or claim 2,

the pad extends in a direction in which the access opening extends.

4. The flexible printed circuit board according to claim 3,

the length dimension in the extending direction of the pad is set to be larger than the sum of the maximum tolerance dimension between the adjacent protrusions and the length dimension in the extending direction of the protrusions.

5. The flexible printed circuit board according to any one of claim 1 to claim 4,

an opening width in a direction orthogonal to the extending direction of the entrance opening is equal to a length dimension of the protrusion in the orthogonal direction.

6. A wiring member is provided with:

a plurality of conductive members including a body portion connected to an electrode terminal of the power storage element; and

a flexible printed circuit board provided with a plurality of conductive circuits to which the conductive member can be connected,

the conductive member has a protrusion protruding from the main body,

the flexible printed circuit board is provided with:

a plurality of insertion openings formed larger than the outer shape of the projection, the projection being insertable through the insertion openings with a gap provided around the projection; and

a plurality of entry openings provided corresponding to the respective insertion openings so that the projections can enter from the insertion openings, the entry openings extending in a plate surface direction of the flexible printed circuit board so as to be narrower than the insertion openings,

the conductive circuit includes pads located at an edge of each of the inlet openings and to which the protrusions are connected.

7. The wiring component according to claim 6,

the body portion is connected to the electrode terminal in a state where the plurality of conductive members are stacked,

the entrance opening extends in the same direction as the other entrance openings from the insertion opening so that the extending direction of the plurality of entrance openings coincides with the stacking direction of the plurality of conductive members.

8. The wiring component according to claim 6 or claim 7,

the pad extends in a direction in which the access opening extends.

9. The wiring component according to claim 8,

the length dimension in the extending direction of the pad is set to be larger than the sum of the maximum tolerance dimension between the plurality of conductive members and the length dimension in the extending direction of the protrusion.

10. The wiring member according to any one of claim 6 to claim 9,

the insertion opening formed by the inlet opening and the insertion opening is an opening with continuously connected opening edges.

11. The wiring member according to any one of claim 6 to claim 10,

an opening width in a direction orthogonal to the extending direction of the entrance opening is equal to a length dimension of the protrusion in the orthogonal direction.

12. The wiring member according to any one of claim 6 to claim 11,

the protrusion is provided with an engaging portion that is engaged with an edge of the inlet opening in a concave-convex manner and can be locked with the edge in a protruding direction.

13. An electricity storage module is provided with:

a storage element group in which a plurality of storage elements are arranged; and

the wiring member as claimed in any one of claim 6 to claim 12.

14. A wiring module mounted in a power storage element group in which a plurality of power storage elements having a pair of electrode terminals are arranged, the wiring module comprising:

a body portion connected to an electrode terminal of the electric storage element;

a plurality of conductive members each having a protrusion protruding from the main body;

a flexible printed circuit board having a plurality of conductive circuits to which the conductive member is connected; and

a stacking member for stacking and holding the plurality of conductive members in an arrangement direction of the electric storage elements,

the flexible printed circuit board is provided with:

an insertion opening formed larger than the outer shape of the projection, the projection being insertable into the insertion opening with a gap provided around the projection; and

an insertion opening that is provided so as to communicate with the insertion opening so that the projection inserted into the insertion opening can be inserted, and that extends in the plate surface direction of the flexible printed circuit board so as to be narrower than the insertion opening,

the conductive circuit includes a pad located at an edge of the inlet opening and to which the protrusion is connected.

15. The wiring module of claim 14,

each of the inlet openings extends in the same direction from the insertion opening such that the extending direction of the inlet openings coincides with the arrangement direction of the power storage elements.

16. The wiring module of claim 14 or claim 15,

the pad extends in a direction in which the access opening extends.

17. The wiring module of claim 16,

the stacking means includes a 1 st stacking means for stacking and holding the conductive member in which the electrode terminals of one of the pair of electrode terminals are connected to each other, and a 2 nd stacking means for stacking and holding the conductive member in which the electrode terminals of the other of the pair of electrode terminals are connected to each other,

a length dimension in an extending direction in which the pad extends is larger than a sum of a maximum tolerance dimension in an arrangement direction of the power storage elements between the 1 st stacking member and the 2 nd stacking member and a length dimension in an extending direction of the protrusion.

18. The wiring module of any of claims 14 through 17,

the insertion opening formed by the inlet opening and the insertion opening is an opening with continuously connected opening edges.

19. The wiring module of any of claims 14 through 18,

an opening width in a perpendicular direction perpendicular to the extending direction of the entrance opening is the same as a length dimension of the perpendicular direction of the protrusion.

20. The wiring module of any of claims 14 through 19,

the protrusion is provided with an engaging portion that is engaged with an edge of the inlet opening in a concave-convex manner and can be locked with the edge in a protruding direction.

Technical Field

The technology disclosed in the present specification relates to a flexible printed circuit board, a wiring member, a power storage module, and a connection module.

Background

For example, as a battery module including a voltage detection circuit that detects a voltage between battery cells, a battery module described in japanese patent No. 5621765 (patent document 1) is known. The voltage detection circuit of the battery module is formed as follows: a connection member provided on a connection bus bar connected to a terminal of an adjacent battery cell is disposed on a contact pad formed on a Flexible Printed Circuit (FPC), and the connection member is connected to the contact pad by reflow soldering.

Documents of the prior art

Patent document

Patent document 1 Japanese patent No. 5621765

Disclosure of Invention

Problems to be solved by the invention

However, in such a voltage detection circuit, since the flat plate-like connection portion provided on the conductive member corresponding to the bus bar is placed on the pad corresponding to the contact pad of the FPC and soldered, a positioning means such as a positioning jig for preventing the displacement between the plate-like connection portion and the pad is additionally required. Further, even if the plate-like connection portion is accurately arranged on the land, there is a possibility that a displacement may occur in the flexible printed circuit board or the wiring member when the land and the plate-like connection portion are connected. However, if the pad and the plate-like connection portion are individually positioned and connected as a countermeasure against the misalignment, the work is troublesome.

The present specification discloses a technique capable of easily suppressing misalignment between a flexible printed circuit board and a conductive member and easily connecting the flexible printed circuit board and the conductive member.

Means for solving the problems

The technology disclosed in the present specification relates to a flexible printed circuit board including a plurality of conductive circuits, to which a protruding portion protruding from a conductive member connected to an electrode terminal of an electric storage element is connected, the flexible printed circuit board including: a plurality of insertion openings formed larger than the outer shape of the projection, the projection being insertable into the insertion openings with a gap provided around the projection; and a plurality of entry openings provided corresponding to the respective insertion openings so that the protruding portions can enter from the insertion openings, and extending in the plate surface direction of the flexible printed circuit board so as to be narrower than the insertion openings, wherein the conductive circuit includes pads located at an edge portion of the entry openings and to which the protruding portions are connected.

Further, the technology disclosed in the present specification relates to a wiring member including: a plurality of conductive members including a body portion connected to an electrode terminal of the power storage element; and a flexible printed circuit board having a plurality of conductive circuits to which the conductive member can be connected, the conductive member having a protrusion protruding from the main body, the flexible printed circuit board including: a plurality of insertion openings formed larger than the outer shape of the projection, the projection being insertable through the insertion openings with a gap provided around the projection; and a plurality of entry openings provided corresponding to the respective insertion openings so that the protruding portions can enter from the insertion openings, and extending in the plate surface direction of the flexible printed circuit board so as to be narrower than the insertion openings, wherein the conductive circuit includes pads located at the edge portions of the respective entry openings and to which the protruding portions are connected.

The technology disclosed in the present specification relates to an electric storage module including an electric storage element group in which a plurality of electric storage elements are arranged, and the wiring member.

Further, the technology disclosed in the present specification relates to a wiring module that is mounted to a power storage element group in which a plurality of power storage elements having a pair of electrode terminals are arranged, the wiring module including: a body portion connected to an electrode terminal of the electric storage element; a plurality of conductive members each having a protrusion protruding from the main body; a flexible printed circuit board having a plurality of conductive circuits to which the conductive member is connected; and a stacking member for stacking and holding the plurality of conductive members in an arrangement direction of the electric storage elements, the flexible printed circuit board including: an insertion opening formed larger than the outer shape of the projection, the projection being insertable into the insertion opening with a gap provided around the projection; and an inlet opening that is provided so as to communicate with the insertion opening so that the projection inserted into the insertion opening can enter, and that extends in the plate surface direction of the flexible printed circuit board so as to be narrower than the insertion opening, wherein the conductive circuit includes a pad that is located at an edge of the inlet opening and to which the projection is connected.

According to this configuration, the projection is inserted into the insertion opening larger than the outer shape of the projection of the conductive member, and the flexible printed circuit board is slid so that the projection enters the insertion opening narrower than the insertion opening, thereby positioning the pad and the projection. Therefore, for example, compared to the case where the plate-shaped connecting portion is arranged with respect to the pad, the pad and the protruding portion can be easily positioned, and the pad provided at the edge of the insertion opening can be easily assembled with respect to the protruding portion of the conductive member.

Further, when the protrusion enters the inlet opening, the protrusion of the conductive member can be easily positioned with respect to the land by locking the protrusion in the orthogonal direction with an edge portion in the orthogonal direction orthogonal to the extending direction of the inlet opening. Further, for example, compared to the case where the plate-shaped connecting portion is arranged with respect to the land, even after the land and the projection are positioned, it is possible to suppress the misalignment between the land and the projection. This facilitates connection of the pad and the projection with solder or the like.

The technique disclosed in the present specification may be configured as follows.

The inlet opening may extend in the same direction from the insertion opening such that the extending directions of the plurality of inlet openings all coincide.

In addition, the body portion may be connected to the electrode terminal in a state where the plurality of conductive members are stacked, and the inlet opening may extend in the same direction as the other inlet openings from the insertion opening so that an extending direction of the plurality of inlet openings coincides with the stacking direction of the plurality of conductive members.

In addition, each of the inlet openings may extend in the same direction from the insertion opening such that an extending direction of the inlet openings coincides with an arrangement direction of the power storage elements.

With this configuration, the projections can be inserted into the plurality of insertion openings, and the flexible printed circuit board can be slid in the arrangement direction of the power storage elements, so that the projections can be positioned by being inserted into the respective insertion openings at a time.

The pad may extend in the direction of the access opening.

According to this configuration, even when a part of the protrusions inserted into the plurality of insertion openings or a part of the plurality of conductive members is displaced in the extending direction of the insertion openings, the protrusions and the pads can be connected. That is, the pad can be prevented from being misaligned with respect to the projection and from being disconnected.

The length of the pad in the extending direction may be set to be larger than the sum of the maximum tolerance between the adjacent projections and the length of the projection in the extending direction.

According to such a configuration, since the length dimension in the extending direction of the land is larger than the maximum tolerance dimension in the extending direction of the inlet opening between the protrusions inserted into the plurality of inlet openings, even when variations due to assembly tolerances or manufacturing tolerances occur in the gap dimension between the protrusions inserted into the plurality of inlet openings, for example, the land can be prevented from being displaced in the extending direction with respect to the protrusions, and the land and the protrusions can be reliably connected.

The length of the pad in the extending direction may be set to be larger than the sum of the maximum tolerance between the plurality of conductive members and the length of the protrusion in the extending direction.

According to such a configuration, since the length dimension in the direction in which the pad extends is larger than the maximum tolerance dimension in the stacking direction of the plurality of conductive members, even when variation due to assembly tolerance or manufacturing tolerance occurs in the gap dimension in the stacking direction of the plurality of conductive members, for example, it is possible to suppress displacement of the pad with respect to the protruding portion of each conductive member, and to reliably connect the pad and the protruding portion.

The stacking member may include a 1 st stacking member for stacking and holding the conductive member in which one of the pair of electrode terminals is connected to each other, and a 2 nd stacking member for stacking and holding the conductive member in which the other of the pair of electrode terminals is connected to each other, wherein a length dimension in an extending direction in which the pad extends is larger than a sum of a maximum tolerance dimension in an arrangement direction of the electric storage elements between the 1 st stacking member and the 2 nd stacking member and a length dimension in an extending direction of the protrusion.

According to such a configuration, since the length dimension in the direction in which the pad extends is larger than the sum of the maximum tolerance dimension between the 1 st stacking member and the 2 nd stacking member and the length dimension of the protrusion, even when a deviation due to an assembly tolerance or a manufacturing tolerance occurs between the protrusion of the conductive member held by the 1 st stacking member and the protrusion of the conductive member held by the 2 nd stacking member, it is possible to suppress a misalignment of the pad with respect to the protrusion of the conductive member, and to reliably connect the pad and the protrusion.

The insertion opening formed by the entrance opening and the insertion opening may be an opening with opening edges continuously connected.

For example, in the case of a side opening of a flexible printed circuit board without a continuously connected insertion opening at the opening edge, the strength of the portion at the side opening may be reduced. This may result in difficulty in entering the protrusion from the insertion opening into the access opening, or the protrusion entering the access opening may be disengaged from the access opening.

However, according to the above configuration, since the opening edges of the insertion opening are continuously connected, the strength of the edge portion of the insertion opening can be suppressed from being reduced. This can prevent the protrusion from entering the access opening from the insertion opening or the protrusion entering the access opening from being detached from the access opening.

The opening width in a direction orthogonal to the extending direction of the inlet opening may be equal to the length of the protrusion in the orthogonal direction.

Here, the opening width being the same as the length of the protrusion in the orthogonal direction includes a case where the opening width of the inlet opening is slightly larger than the length of the protrusion and a case where the opening width of the inlet opening is slightly smaller than the length of the protrusion.

According to the above configuration, the protrusion of the conductive member can be disposed close to the pad provided at the edge of the inlet opening, and therefore the protrusion and the pad can be easily connected by solder or the like.

The projection may be provided with an engaging portion that is engaged with an edge of the inlet opening in a concave-convex manner and is lockable to the edge in a protruding direction.

According to the above configuration, when the protrusion enters the entrance opening, the edge of the entrance opening and the engagement portion are locked in the protruding direction, and the protrusion can be prevented from being disengaged from the entrance opening in the protruding direction. That is, the pad and the projection can be reliably connected while preventing the pad from being displaced from the projection.

Effects of the invention

According to the technique disclosed in the present specification, it is possible to easily connect the flexible printed circuit board and the conductive member while easily suppressing misalignment between the flexible printed circuit board and the conductive member.

Drawings

Fig. 1 is a perspective view showing an electricity storage module according to embodiment 1.

Fig. 2 is a plan view showing the power storage module.

Fig. 3 is a partially enlarged plan view showing a state where the protrusion of the conductive member and the pad of the flexible printed circuit board are connected.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a perspective view showing a state before the flexible printed circuit board is mounted on the conductive member.

Fig. 6 is a plan view showing the flexible printed circuit board.

Fig. 7 is an enlarged plan view of a main portion of fig. 6.

Fig. 8 is a perspective view showing the conductive member.

Fig. 9 is a plan view showing the conductive member.

Fig. 10 is a plan view showing a state where the protrusion of the conductive member is inserted into the insertion opening.

Fig. 11 is a plan view showing a state where the protrusion of the conductive member enters the entry opening.

Fig. 12 is a perspective view showing a state before the protrusion of the conductive member is inserted into the insertion opening.

Fig. 13 is a perspective view showing a state in which the protrusion of the conductive member is inserted through the insertion opening.

Fig. 14 is a perspective view showing a state where the protrusion of the conductive member enters the entry opening.

Fig. 15 is a perspective view showing an electricity storage module according to embodiment 2.

Fig. 16 is a plan view showing the power storage module.

Fig. 17 is a side view showing a power storage module with a part omitted.

Fig. 18 is a perspective view showing a state before the wiring module is mounted on the electric storage element group.

Fig. 19 is a plan view showing the wiring module.

Fig. 20 is a perspective view showing a state before the flexible printed circuit board is mounted on the conductive member.

Fig. 21 is a perspective view showing that a part of the conductive member in embodiment 3 is omitted.

Fig. 22 is an enlarged plan view showing a state where the protrusion of the conductive member and the pad of the flexible printed circuit board are connected.

Fig. 23 is a sectional view taken along line B-B of fig. 22.

Fig. 24 is a perspective view showing that a part of the conductive member in embodiment 4 is omitted.

Fig. 25 is an enlarged plan view showing a state where the protrusion of the conductive member and the pad of the flexible printed circuit board are connected.

Fig. 26 is a sectional view taken along line C-C of fig. 25.

Detailed Description

< embodiment 1 >

Embodiment 1 of the technology disclosed in the present specification will be described with reference to fig. 1 to 14.

The power storage module M according to the present embodiment is a power storage module M used as a drive source of a vehicle such as an electric vehicle or a hybrid vehicle, and includes a power storage element group 20 in which a plurality of power storage elements 21 are arranged, a plurality of conductive members 30 including a body portion 33 connected to electrode terminals 22 of the power storage elements 21, and a flexible printed circuit board (hereinafter, may be simply referred to as "FPC") 40 including a plurality of conductive circuits 42 to which the conductive members 30 are connected. Here, the conductive member 30 and the flexible printed circuit board 40 correspond to wiring members. In the following description, the front-rear direction is defined by the F side as the front side and the B side as the rear side with reference to the left-right direction in fig. 2 and 6. The left-right direction will be described with reference to the up-down direction in fig. 2 and 6, with the L side being the left side and the R side being the right side.

The electric storage element 21 is, for example, a rectangular parallelepiped-shaped secondary battery having a flat outer shape, and as shown in fig. 1 and 2, a plurality of (6 in the present embodiment) electric storage elements 21 are stacked and aligned in a row in the front-rear direction to constitute an electric storage element group 20.

The electric storage element 21 includes an electrode arrangement surface (upper surface in fig. 1) 23 perpendicular to a surface facing the adjacent electric storage element 21, and a pair of flat electrode terminals 22 are arranged at both ends in the left-right direction of the electrode arrangement surface 23. One of the pair of electrode terminals 22 is a positive electrode terminal 22P, and the other is a negative electrode terminal 22N. In the electric storage element group 20, the adjacent 2 electric storage elements 21 are aligned in a row in the front-rear direction such that the electrode terminals 22 having different polarities are adjacent to each other (such that the positive electrode terminal 22P of one electric storage element 21 and the negative electrode terminal 22N of another adjacent electric storage element 21 are adjacent to each other).

The conductive member 30 is formed by processing a metal plate having conductivity such as copper, a copper alloy, aluminum, an aluminum alloy, and stainless steel (SUS) by pressing or the like.

As shown in fig. 1 and 2, the conductive member 30 includes: a connection bus bar 31 that connects the positive electrode terminal 22P and the negative electrode terminal 22N of the adjacent power storage elements 21 in the power storage element group 20; and an end bus bar 32 connected to the electrode terminals 22 arranged at the ends of the electric storage element group 20.

As shown in fig. 8 and 9, the connection bus bar 31 includes a main body 33 having a substantially rectangular flat plate shape that is long in the front-rear direction, and a connection protruding piece 34 provided continuously to one side edge of the main body 33 in the left-right direction. The longitudinal length of the main body 33 of the end bus bar 32 is shorter than that of the connecting bus bar 31, but other configurations are the same, and therefore, the description thereof is omitted.

The body portion 33 is electrically connected to the electrode terminals 22 of the energy storage elements 21 by welding or the like, and connects the adjacent energy storage elements 21 in series as shown in fig. 1 and 2. Therefore, in the present embodiment, the electrode terminals 22 of different polarities of the adjacent power storage elements 21 are connected to each other by the connection bus bar 31, and the plurality of power storage elements 21 are connected in series to constitute the power storage element group 20. In addition, the electric storage element group may have the following structure: the adjacent storage elements constituting a part of the storage element group are connected in parallel by arranging the storage elements of the part of the storage element group so that the electrode terminals having the same polarity are adjacent to each other.

As shown in fig. 5, the main body 33 of each conductive member 30 is disposed so that a connection protruding piece 34 described later is positioned on the side edge of the center side of the power storage element 21, and is linearly arranged in the front-rear direction in which the power storage elements 21 are arranged and disposed on the electrode terminal 22.

The main body 33 includes an extended portion 33A extending laterally from a substantially central portion in the front-rear direction of one side edge in the left-right direction, and a connection protruding piece 34 is provided in a protruding manner at an extended end edge of the extended portion 33A.

As shown in fig. 5, 8, and 9, the connecting projecting piece 34 includes a flat plate portion 35 in a rectangular flat plate shape slightly projecting in the vertical direction with respect to the plate surface of the main body portion 33, and a connecting projecting portion (an example of a "projecting portion") 36 projecting further in the vertical direction from the extending end portion of the flat plate portion 35.

The connecting projection 36 is formed in a rectangular parallelepiped shape shorter than the flat plate portion 35 in the front-rear direction.

The FPC40 is a member for electrically connecting the plurality of conductive members 30 to an electronic control unit (hereinafter, sometimes referred to as "ECU") not shown, and for transmitting a voltage applied to the conductive members 30 to the ECU. As shown in fig. 1, 2, and 6, the FPC40 includes a substantially rectangular sheet-like FPC main body 41 that is long in the front-rear direction along the arrangement of the power storage elements 21.

As shown in fig. 12, the FPC body 41 includes a plurality of conductive circuits 42 formed of copper foil and an insulating resin film 43 covering both surfaces of the conductive circuits 42.

As shown in fig. 6, an external connection portion 44 protruding substantially rectangular forward is provided at the front end portion of the FPC body 41. The distal end portions, which are one end portions of the plurality of conductive circuits 42, are gathered at the external connection portion 44, and each conductive circuit 42 is connected to the ECU via the external connection portion 44.

A plurality of bonding portions 45 are formed on both side edges of the FPC body 41 in the left-right direction and linearly arranged along the extending direction of the FPC body 41, and the conductive member 30 is connected to the bonding portions 45.

As shown in fig. 6, 7, and 12, the joint portion 45 is substantially rectangular in shape and long in the front-rear direction, and includes an insertion opening 50 that penetrates the FPC body 41 in the plate thickness direction, and a land 60 that is formed by exposing the rear end portion, which is the other end portion of the plurality of conductive circuits 42, to the upper side opposite to the power storage element 21 side.

The insertion opening 50 is an opening having opening edges 50A continuously connected to each other, and the connection protrusion 36 of the conductive member 30 can be inserted into the insertion opening 50 from below, which is the power storage element 21 side.

The insertion opening 50 is constituted by an insertion opening 51 disposed at the rear end portion of the joint portion 45 and an entrance opening 52 communicating with the front portion of the insertion opening 51.

The insertion opening 51 is formed in a substantially rectangular shape in plan view larger than the outer shape of the connection protrusion 36 of the conductive member 30, and as shown in fig. 10, the connection protrusion 36 is inserted into the insertion opening 51 with a gap provided between the connection protrusion 36 and the edge 51A of the insertion opening 51 (around the connection protrusion 36).

As shown in fig. 11, the entrance opening 52 is long in the front-rear direction, which is the arrangement direction of the conductive members 30. The insertion opening 52 is formed at the front end of the insertion opening 51 so as to extend forward from a position near the center of the FPC body 41.

The longitudinal length L1 of the insertion opening 52 is greater than the longitudinal length L2 of the insertion opening 51, and is greater than the sum of the maximum tolerance dimension of the gap in the longitudinal direction between the connection protrusions 36 of the conductive members 30 adjacent in the longitudinal direction to which the electric storage element group 20 is connected (the sum of the maximum value of the manufacturing tolerance between the connection protrusions 36 and the maximum value of the assembly tolerance) L3 and the longitudinal length L4 of the connection protrusions 36 (L1 ≧ L3+ L4).

The opening width L5 in the left-right direction (orthogonal direction) orthogonal to the extending direction of the entry opening 52 substantially coincides with the length L6 in the left-right direction of the connection protrusion 36 of the conductive member 30, and the connection protrusion 36 of the conductive member 30 inserted through the insertion opening 51 can enter the entry opening 52 in an appropriate state.

Therefore, by inserting the connection projection 36 into the insertion opening 51, as shown in fig. 10 and 13, the connection projection 36 can be easily inserted into the insertion opening 50, and the FPC40 is slid backward in a state where the connection projection 36 is inserted into the insertion opening 51, so that the connection projection 36 is inserted into the insertion opening 52 in a proper state.

That is, as shown in fig. 11 and 14, when the connection projection 36 enters the entrance opening 52 of the joint portion 45, the pair of side edge lands 61 can be prevented from being displaced in the left-right direction with respect to the connection projection 36 by the side edge portions 53A on both sides of the entrance opening 52 in the left-right direction being locked to the connection projection 36 in the left-right direction.

Further, since the entry openings 52 of all the joint portions 45 of the FPC main body 41 extend forward from the front ends of the insertion openings 51, the connection protrusions 36 can be once inserted into the entry openings 52 by sliding the FPC40 rearward with the connection protrusions 36 inserted into the insertion openings 51.

As shown in fig. 6, 7, and 12, the pad 60 is provided at the edge portion 53 of the entrance opening 52, and includes a pair of side edge pads 61 disposed at the side edge portions 53A on both sides of the entrance opening 52 in the left-right direction, and a connection pad 62 disposed at the front edge portion 53B of the entrance opening 52.

The pair of side edge pads 61 extend in the front-rear direction in which the entrance opening 52 extends along the side edge portion 53A of the entrance opening 52, and are formed along the entire length of the side edge portion 53A in the front-rear direction.

The connection pad 62 connects the pair of side edge pads 61 in the left-right direction along the front edge of the entrance opening 52, and the conductive circuit 42 extends forward from the front end of the connection pad 62.

That is, as shown in fig. 11 and 14, since the longitudinal length L1 of the inlet opening 52 is larger than the sum of the maximum tolerance L3 between the connection protrusions 36 of the adjacent conductive members 30 and the longitudinal length L4 of the connection protrusions 36, when the FPC40 is slid backward and the connection protrusions 36 enter the inlet opening 52 of the joint 45, the connection protrusions 36 do not protrude from the inlet opening 52, and the connection protrusions 36 are surely arranged between the pair of side edge pads 61. This allows the pair of side edge pads 61 and the connecting projection 36 to be easily and reliably connected by solder P or the like.

The present embodiment is configured as described above, and the following describes the manufacturing method of the power storage module M and the operational effects of the flexible printed circuit board 40.

First, as shown in fig. 5, the plurality of conductive members 30 are arranged so as to connect the electrode terminals 22 of different polarities of the adjacent electric storage elements 21 in the electric storage element group 20 to each other.

Here, each conductive member 30 is disposed such that the connection protruding piece 34 of each conductive member 30 is positioned on the center side of the power storage element 21. Further, the body portions 33 of the respective conductive members 30 are arranged linearly in the front-rear direction in which the power storage elements 21 are arranged.

Next, the conductive members 30 disposed on the electrode terminals 22 are electrically connected to the electrode terminals 22 by welding or the like, thereby constituting the power storage element group 20 in which the adjacent power storage elements 21 are connected in series.

Next, the joint 45 of the FPC40 is aligned with the conductive member 30, and the connection protrusion 36 of the conductive member 30 is connected to the pad 60 of the joint 45 with the solder P.

Here, for example, when a flat plate-shaped connecting portion provided on a conductive member is disposed on an FPC and soldered with a conductive circuit exposed on a pad, a positioning means such as a positioning jig is additionally required because the plate-shaped connecting portion and the pad may be misaligned.

Even if the plate-like connection portion is accurately arranged on the land, there is a possibility that a displacement may occur in the FPC or the wiring member when the land and the plate-like connection portion are connected. As a countermeasure against the misalignment, the work is troublesome when the land and the plate-like connection portion are individually positioned and connected.

However, as shown in fig. 11, the FPC40 of the present embodiment includes: a plurality of insertion openings 51 formed larger than the outer shape of the connection protrusion 36, the connection protrusion 36 being insertable into the insertion openings 51 with a gap around the connection protrusion 36; and a plurality of inlet openings 52 provided corresponding to the respective insertion openings 51 so that the connection projections 36 can enter from the insertion openings 51, and extending in the plate surface direction of the flexible printed circuit board 40 so as to be narrower than the insertion openings 51, wherein the conductive circuit 42 includes pads 60 located at an edge 53 of the inlet openings 52 and to which the connection projections 36 are connected.

Therefore, as shown in fig. 10, 11, 13, and 14, according to the present embodiment, when the connection protrusions 36 of the plurality of conductive members 30 mounted on the electric storage element group 20 are inserted into the insertion openings 51 of the respective joint portions 45 of the FPC40 and the flexible printed circuit board 40 is slid rearward, the connection protrusions 36 are inserted into the insertion openings 52 just like they are. The pair of side edges 53A of the inlet opening 52 are locked to the connecting projections 36 in the left-right direction, so that the connecting projections 36 of the conductive member 30 are prevented from being displaced in the left-right direction with respect to the inlet opening 52, and the connecting projections 36 can be easily positioned with respect to the pair of side edge lands 61.

Further, since the connection protrusion 36 is inserted into the insertion opening 51 larger than the outer shape of the connection protrusion 36 of the conductive member 30 and the connection protrusion 36 is inserted into the insertion opening 52 narrower than the insertion opening 51 in a proper state, the connection protrusion 36 can be prevented from coming off between the pair of side edge lands 61 even after the connection protrusion 36 is disposed between the pair of side edge lands 61, for example, as compared with the case where a plate-shaped connection portion is disposed with respect to the land.

Thereby, the connection projection 36 and the pair of side edge pads 61 are reliably connected by the solder P, and the electrical module is completed.

As described above, the present embodiment relates to a flexible printed circuit board 40 including a plurality of conductive circuits 42, and a connection protrusion 36 protruding from a connection protrusion 34 of a conductive member 30 connected to an electrode terminal 22 of an electric storage element 21 is connected to the conductive circuits 42, the flexible printed circuit board 40 including: a plurality of insertion openings 51 formed larger than the outer shape of the connection protrusion 36, the connection protrusion 36 being insertable into the insertion openings 51 with a gap around the connection protrusion 36; and a plurality of inlet openings 52 provided corresponding to the respective insertion openings 51 so that the connection projections 36 can enter from the insertion openings 51, and extending in the plate surface direction of the flexible printed circuit board 40 so as to be narrower than the insertion openings 51, wherein the conductive circuit 42 includes pads 60 located at an edge 53 of the inlet openings 52 and to which the connection projections 36 are connected.

Further, the present embodiment relates to a wiring member including: a plurality of conductive members 30 each including a body portion 33 connected to the electrode terminal 22 of the storage element 21; and a flexible printed circuit board 40 having a plurality of conductive circuits 42 to which the conductive member 30 can be connected, the conductive member 30 having a connection protruding piece 34 protruding from the main body 33, the flexible printed circuit board 40 including: a plurality of insertion openings 51 formed larger than the outer shape of the connection protrusion 36, the connection protrusion 36 being insertable into the insertion openings 51 with a gap around the connection protrusion 36; and a plurality of inlet openings 52 provided corresponding to the respective insertion openings 51 so that the connection projections 36 can enter from the insertion openings 51, and extending in the plate surface direction of the flexible printed circuit board 40 so as to be narrower than the insertion openings 51, wherein the conductive circuit 42 includes pads 60 located at an edge 53 of the inlet openings 52 and to which the connection projections 36 are connected.

That is, according to the present embodiment, when the connection protrusion 36 of the conductive member 30 is inserted into the insertion opening 51 and the flexible printed circuit board 40 is slid backward to cause the connection protrusion 36 to enter the entry opening 52, the lateral edge 53A in the left-right direction perpendicular to the extending direction of the entry opening 52 is locked to the connection protrusion 36 in the left-right direction, and the connection protrusion 36 of the conductive member 30 can be easily positioned with respect to the land 60 of the flexible printed circuit board 40. This allows the pad 60 and the connection projection 36 to be easily connected by solder P or the like.

Further, since the connection protrusion 36 is inserted into the insertion opening 51 larger than the outer shape of the connection protrusion 36 of the conductive member 30 and the connection protrusion 36 is inserted into the insertion opening 52 narrower than the insertion opening 51, for example, even after the land 60 and the connection protrusion 36 are positioned, the misalignment between the land 60 and the connection protrusion 36 can be suppressed as compared with a case where a plate-shaped connection portion is disposed with respect to the land.

The entrance opening 52 extends from the insertion opening 51 in the same direction, i.e., forward, so that the extending directions of the plurality of entrance openings 52 are all the same. As a result, the connection projections 36 are inserted into the plurality of insertion openings 51, and the entire flexible printed circuit board 40 is slid rearward, whereby the connection projections 36 can be inserted into the respective insertion openings 52 at a time and positioned.

Further, since the pair of side edge lands 61 of the land 60 extend in the extending direction in which the inlet opening 52 extends, that is, the front-rear direction, even when a part of the connecting projection 36 inserted through the plurality of insertion openings 51 is slightly shifted in the front-rear direction, the connecting projection 36 and the land 60 can be connected.

That is, the pad 60 can be further suppressed from being misaligned with respect to the connection protrusion 36 and being unable to be connected.

The longitudinal length L1 of the land 60 is set to be greater than the sum of the maximum tolerance L3 between the adjacent connection projections 36 and the longitudinal length L4 of the connection projections 36.

Specifically, the longitudinal length L1 of the pad 60 is greater than the sum of the maximum tolerance L3 between the connection protrusions 36 of the plurality of conductive members 30 and the longitudinal length L4 of the connection protrusions 36.

That is, according to the above configuration, since the length L1 in the front-rear direction of the land 60 is larger than the sum of the maximum tolerance L3 in the stacking direction of the connection protrusions 36 of the plurality of conductive members 30 and the length L4 in the front-rear direction of the connection protrusions 36, even when the gap size in the stacking direction, that is, in the front-rear direction of the plurality of conductive members 30 varies due to, for example, assembly tolerance or manufacturing tolerance, it is possible to suppress the displacement between each connection protrusion 36 and the land 60. This enables the pad 60 and the connection projection 36 to be reliably connected.

In addition, according to the present embodiment, the insertion opening 50 composed of the entrance opening 52 and the insertion opening 51 is an opening in which the opening edges 50A are continuously connected.

For example, in the case of a side opening of a flexible printed circuit board without a continuously connected insertion opening having an opening edge, the strength of a portion at the side opening may be reduced, thereby possibly causing difficulty in entering a protrusion from the insertion opening into an access opening or disengaging the protrusion entered into the access opening from the access opening.

However, according to the present embodiment, since the opening edges 50A of the insertion openings 50 are continuously connected, the strength of the opening edges 50A of the insertion openings 50 can be suppressed from being reduced. This can suppress the difficulty in entering the connection protrusion 36 from the insertion opening 51 into the entrance opening 52 or the separation of the connection protrusion 36 entering the entrance opening 52 from the entrance opening 52.

Further, according to the present embodiment, since the opening width L5 in the left-right direction of the entry opening 52 is the same as the length L6 in the left-right direction of the connection protrusion 36, the connection protrusion 36 and the land 60 can be easily connected by solder P or the like. The opening width L5 of the inlet opening 52 described here includes a case where the opening width L5 of the inlet opening 52 is slightly larger than the length L6 of the connecting protrusion 36 in the left-right direction and a case where the opening width L5 of the inlet opening 52 is slightly smaller than the length L6 of the connecting protrusion 36 in the left-right direction, which are the same as the length L6 of the connecting protrusion 36 in the left-right direction.

< embodiment 2 >

Next, embodiment 2 will be described with reference to fig. 15 to 20.

The power storage module M1 of embodiment 2 includes the aligning member 70 for aligning and holding the conductive member 30 in embodiment 1, and the longitudinal length L1 of the entry opening 52 of the FPC40 in the front-rear direction is changed to have the same function and effect as those of embodiment 1, and therefore, the description thereof may be omitted to avoid redundancy. The same components as those in embodiment 1 are denoted by the same reference numerals.

The power storage module M1 according to embodiment 2 includes a power storage element group 20 in which a plurality of power storage elements 21 are arranged, and a wiring module WM attached to an electrode arrangement surface 23 of the power storage element group 20.

The wiring module WM includes: a plurality of conductive members 30 having a body portion 33 connected to the electrode terminal 22 of the storage element 21; an FPC140 having a plurality of conductive circuits 42 connected to the conductive members 30; and a stacking member 70 for linearly stacking and holding the plurality of conductive members 30 in the arrangement direction of the power storage elements 21, i.e., the front-rear direction.

In the power storage module M1 of the present embodiment, the plurality of conductive members 30, the FPC140, and the placement member 70 are integrated as 1 wiring module WM, and then the wiring module WM is attached to the electrode arrangement surface 23 of the power storage element group 20. Note that, since the storage element group 20 and the conductive member 30 have the same configuration as that of embodiment 1, a separate description thereof is omitted.

The stacking member 70 is made of an insulating resin, and as shown in fig. 18, includes a pair of holding members 71 attached from above to the electrode arrangement surface 23 of the electric storage element group 20.

As shown in fig. 18 to 20, each of the pair of holding members 71 is formed in a substantially rectangular flat plate shape that is long in the arrangement direction of the power storage elements 21, i.e., the front-rear direction.

Of the pair of holding members 71, the holding member 71 that linearly positions and holds the conductive member 30 that connects the right electrode terminals 22 of the power storage element 21 in the front-rear direction is referred to as a 1 st holding member (an example of a "1 st positioning member") 71R, and the holding member 71 that linearly positions and holds the conductive member 30 that connects the left electrode terminals 22 in the front-rear direction is referred to as a 2 nd holding member (an example of a "2 nd positioning member") 71L.

Fitting projections 72 are provided at the lower end portions of the 1 st holding member 71R and the 2 nd holding member 71L, and the fitting projections 72 are fitted from above into fitting recesses 24 provided between the electrode terminals 22 of the adjacent energy storage elements 21 in the front-rear direction in the energy storage element group 20.

As shown in fig. 15 and 17, the 1 st holding member 71R is disposed on the electrode terminal 22 at the right end of the electric storage element group 20 such that the fitting protrusion 72 fits in the fitting recess 24, and the 2 nd holding member 71L is disposed on the electrode terminal 22 at the left end of the electric storage element group 20 such that the fitting protrusion 72 fits in the fitting recess 24.

As shown in fig. 18 to 20, a plurality of receiving portions 74 in which the conductive members 30 are received in a row in the front-rear direction are provided on the upper portions of the 1 st holding member 71R and the 2 nd holding member 71L via the coupling portion 75. In the present embodiment, the 1 st holding member 71R and the 2 nd holding member 71L have 3 receiving portions 74 in the front-rear direction connected in a row in the front-rear direction by 2 connecting portions 75.

Each housing portion 74 is substantially rectangular in plan view, and includes a central opening portion 76 that is open to the lower side of the power storage element 21 and to the upper side of the opposite side to the power storage element 21, and that is open to a portion of a wall portion 74A on the central side of the power storage element 21. The body portion 33 of the conductive member 30 is accommodated in the accommodation portion 74 in a state of being just above, and when the body portion 33 is accommodated in the accommodation portion 74, the connection projection 34 is fitted in the central opening portion 76 in a state of being just above. When the main body portion 33 is housed in the housing portion 74, the main body portion 33 is supported from below by a support portion, not shown, provided at a lower end portion of the housing portion 74.

Therefore, when the body portion 33 of the conductive member 30 is housed in all of the housing portions 74 of the 1 st holding member 71R and the 2 nd holding member 71L, the conductive member 30 is aligned in the front-rear direction at both ends in the left-right direction of the electric storage element group 20, and the connection protrusions 36 of the connection tabs 34 of the conductive member 30 are aligned in the front-rear direction. When the main body portion 33 of the conductive member 30 is accommodated in the accommodation portion 74, the main body portion 33 is locked in the accommodation portion 74 by a locking portion, not shown, provided in the accommodation portion 74.

On the other hand, as shown in fig. 16, in the FPC140, the length L21 in the front-rear direction of the entry opening 152 of the joint portion 145 is different from that in embodiment 1, but the other configurations are the same.

The longitudinal length L21 of the insertion opening 152 is set to be larger than the sum of the maximum tolerance L23 in the longitudinal direction between the 1 st holding member 71R and the 2 nd holding member 71L and the longitudinal length L4 of the connection protrusion 36 when the stacking member 70 is attached to the electric storage element group 20 (L21 ≧ L23+ L4).

The wiring module WM of the present embodiment is configured as described above, and a method for manufacturing the wiring module WM and a method for manufacturing the power storage module M1 will be described below.

First, the body portion 33 of the conductive member 30 is received from above in all the receiving portions 74 of the 1 st holding member 71R and the 2 nd holding member 71L of the stacking member 70, and a pair of holding members 71 in which a plurality of conductive members 30 are aligned in a straight line in the front-rear direction are configured.

Next, as shown in fig. 20, the pair of holding members 71 are arranged such that the interval between the 1 st holding member 71R and the 2 nd holding member 71L is substantially equal to the interval between the pair of electrode terminals 22 of the electricity storage element 21 and the fitting protrusion 72 of the 1 st holding member 71R and the 2 nd holding member 71L can be fitted into the fitting recess 24 of the electricity storage element group 20.

Next, when the pair of holding members 71 are arranged, the FPC140 is assembled to the pair of holding members 71 from above by inserting the connecting protrusion 36 of each conductive member 30 into each insertion opening 51 of the FPC140 from below.

Then, the FPC140 is slid backward, and the connection protrusion 36 inserted into the insertion opening 51 is inserted into the insertion opening 152 in a proper state. In this way, the connection protrusion 36 of the conductive member 30 is positioned in the left-right direction with respect to the pair of side edge pads 61 of the pad 60 of the FPC140 by the engagement of the connection protrusion 36 with the left-right direction both side edges 53A of the entry opening 152.

Here, according to the present embodiment, the longitudinal length L21 of the inlet opening 152 is set to be larger than the sum of the longitudinal maximum tolerance L23 between the 1 st holding member 71R and the 2 nd holding member 71L and the longitudinal length L4 of the connecting protrusion 36, so that even when the position of the 2 nd holding member 71L relative to the 1 st holding member 71R is shifted in the longitudinal direction due to the manufacturing tolerance or the assembly tolerance of the 1 st holding member 71R or the 2 nd holding member 71L, the connecting protrusion 36 can be prevented from coming off from the pair of side edge pads 61, and the connecting protrusion 36 and the pair of side edge pads 61 can be reliably connected.

Next, when the positioning of the connection projection portion 36 of the conductive member 30 and the pair of side edge pads 61 of the flexible printed circuit board 40 is completed, the connection projection portion 36 and the pair of side edge pads 61 are connected by the solder P. As a result, as shown in fig. 18 and 19, the placement member 70, the plurality of conductive members 30 placed in 2 rows by the placement member 70, and the FPC140 connected to the connection protrusion 36 of each conductive member 30 are completed to form the wiring module WM.

When wiring module WM is completed, fitting protrusion 72 of positioning member 70 is fitted into fitting recess 24 of power storage element group 20, wiring module WM is assembled to electrode arrangement surface 23 of power storage element group 20, and as shown in fig. 15 and 17, main body 33 of conductive member 30 and electrode terminal 22 of power storage element 21 are welded to complete power storage module M1.

As described above, the present embodiment relates to a wired module WM to be mounted to an electric storage element group 20 in which a plurality of electric storage elements 21 each including a pair of electrode terminals 22 are arranged, and the wired module WM includes: a body portion 33 connected to the electrode terminal 22 of the storage element 21; a plurality of conductive members 30 each having a connection protruding piece 34 protruding from the body 33; a flexible printed circuit board 40 having a plurality of conductive circuits 42 to which the conductive members 30 are connected; and a stacking member 70 for stacking and holding the plurality of conductive members 30 in the front-rear direction of the arrangement direction of the electric storage elements 21. The flexible printed circuit board 40 includes: an insertion opening 51 formed larger than the outer shape of the connection protrusion 36 of the connection protruding piece 34, through which the connection protrusion 36 can be inserted in a state where a gap is provided around the connection protrusion 36, and the insertion opening 51; and an entrance opening 52 that is provided so as to communicate with the insertion opening 51 so that the connection protrusion 36 inserted into the insertion opening 51 can enter, and that extends in the plate surface direction of the flexible printed circuit board 40 so as to be narrower than the insertion opening 51, wherein the conductive circuit 42 includes a pad 60 to which the connection protrusion 36 is connected, at an edge portion 53 of the entrance opening 152.

Each of the inlet openings 152 extends in the same direction, i.e., forward from the insertion opening 51 so that the extending direction of the inlet openings 152 coincides with the arrangement direction of the power storage elements 21.

The stacking member 70 includes a 1 st holding member (1 st stacking member) 71R for stacking and holding the conductive member 30 connecting one of the pair of electrode terminals 22 to each other and a 2 nd holding member (2 nd stacking member) 71L for stacking and holding the conductive member 30 connecting the other electrode terminal 22 to each other, the pair of side edge lands 61 of the land 60 extend in the front-rear direction in which the inlet opening 152 extends, and the length L21 in the extending direction in which the pair of side edge lands 61 extend is set to be larger than the sum of the maximum tolerance L23 in the front-rear direction between the 1 st holding member (1 st stacking member) 71R and the 2 nd holding member (2 nd stacking member) 71L and the length L4 in the front-rear direction in which the protrusion 36 is connected.

That is, according to the present embodiment, even if the position of the 2 nd holding member 71L with respect to the 1 st holding member 71R is shifted in the front-rear direction due to the manufacturing tolerance or the assembly tolerance of the 1 st holding member 71R or the 2 nd holding member 71L, the connection protrusion 36 can be connected to the pair of side edge lands 61. That is, the pair of side edge pads 61 can be prevented from being misaligned with respect to the connection protrusion 36 and being unable to be connected.

< embodiment 3 >

Next, embodiment 3 will be described with reference to fig. 21 to 23.

The conductive member 230 of embodiment 3 is obtained by changing the shape of the connection protrusion 36 of the connection tab 34 of the conductive member 30 of embodiment 1 and changing the opening width L5 in the left-right direction of the entrance opening 252, and the configuration, operation, and effect common to those of embodiment 1 will be omitted for redundancy. The same components as those in embodiment 1 are denoted by the same reference numerals.

As shown in fig. 21 and 23, the connection protrusion 236 of the connection protrusion 234 of the conductive member 230 according to embodiment 3 is provided with a notch groove 238 extending in the front-rear direction at the lower end portion on the side of the body portion 33.

The notch groove 238 is slightly recessed in an arc shape with respect to the connecting protrusion 236, and is formed over the entire length of the connecting protrusion 236 in the front-rear direction.

On the other hand, as shown in fig. 22 and 23, the opening width L25 of the entry opening 252 of the FPC240 is narrower than the length L26 of the connection protrusion 236 in the left-right direction, and is larger than the difference L28 between the length L26 of the connection protrusion 236 in the left-right direction and the recess L27 of the notch groove 238 (L26 > L25 > L28 ═ L26-L27).

When the FPC240 is slid backward, as shown in fig. 23, the connection protrusion 236 is inserted from the insertion opening 51 into the insertion opening 252 so that the side edge portion 53A of the insertion opening 252 on the main body portion 33 side fits into the notch groove 238.

That is, when the connection protrusion 236 enters the entrance opening 252, the notch groove 238 is fitted in the recess-projection manner to the side edge portion 53A of the entrance opening 252 on the body portion 33 side, and the engagement portion 238A as the upper side edge of the notch groove 238 is locked to the side edge portion 53A of the entrance opening 252 of the FPC240 in the protruding direction of the connection protrusion 236, that is, the vertical direction, so that the connection protrusion 236 does not come off in the upward direction with respect to the entrance opening 252. This allows the connection protrusion 236 of the conductive member 230 to be connected to the pair of side edge pads 61 of the FPC240 by the solder P without being displaced vertically and horizontally.

< embodiment 4 >

Next, embodiment 4 will be described with reference to fig. 24 to 26.

The conductive member 330 according to embodiment 4 is obtained by modifying the shape of the connection protrusion 36 of the connection tab 34 of the conductive member 30 according to embodiment 1, and the configuration, operation, and effect common to those of embodiment 1 will be omitted for redundancy. The same components as those in embodiment 1 are denoted by the same reference numerals.

As shown in fig. 24 to 26, the protruding end of the connecting projection 336 of the connecting projection 334 of the conductive member 330 according to embodiment 4 is an outward extending locking piece (an example of an "engaging portion") 339 that extends toward the main body 33.

The projecting locking piece 339 is formed by hammering or the like the projecting end of the connecting projection 336, and the projecting dimension L37 of the projecting locking piece 339 is substantially the same as the plate thickness dimension of the connecting projection 334.

Therefore, when the FPC40 is slid backward and the connecting projection 336 is inserted into the insertion opening 52 from the insertion opening 51, as shown in fig. 26, the side edge portion 53A of the insertion opening 52 on the main body portion 33 side is in a state of being fitted between the extended portion 33A of the conductive member 330 and the projecting locking piece 339 of the connecting projection 336 in a concave-convex manner. That is, when the connecting projection 336 enters the entrance opening 52, the side edge portion 53A of the entrance opening 52 of the FPC40 is locked to the outer locking piece 339 in the protruding direction of the connecting projection 336, that is, the vertical direction, and the connecting projection 336 is not separated upward from the entrance opening 52. This allows the connection protrusion 336 of the conductive member 330 to be connected to the pair of side edge pads 61 of the FPC40 by the solder P without being displaced vertically and horizontally.

< other embodiments >

The technology disclosed in the present specification is not limited to the embodiments described above and illustrated in the drawings, and includes, for example, the following various embodiments.

(1) In the above embodiment, the protrusion is formed in a rectangular parallelepiped shape. However, without being limited thereto, the protrusion may be formed in a cylindrical shape or a polygonal columnar shape.

(2) In the above embodiment, the following configuration is adopted: both of the joint 45 connecting to the connection protrusion 36 of the conductive member 30 connected to the right electrode terminal 22 of the electric storage element 21 and the joint 45 connecting to the connection protrusion 36 of the conductive member 30 connected to the left electrode terminal 22 of the electric storage element 21 are formed in the FPC 40. However, without being limited thereto, the FPC may be constituted as follows: the FPC body is separated in the left-right direction, and a joint portion connected to only the protruding portion of the conductive member as the electrode terminal of any one of the left-right directions of the electric storage element is provided.

(3) In the above embodiment, the insertion opening 51 has a substantially rectangular shape in a plan view. However, the insertion opening may be circular or elliptical in plan view.

(4) In the above embodiment, the opening edge 50A of the insertion opening 50 is continuously connected. However, the present invention is not limited to this, and the insertion opening may be opened to the side portion of the FPC without continuously connecting the opening edges, as long as the surface-mount metal plate or the like on the storage element side of the junction portion is reinforced.

Description of the reference numerals

20: group of storage elements

21: electric storage element

22: electrode terminal

30. 230: conductive member

33: main body part

36: connection protrusion (an example of a protrusion)

40: flexible printed circuit board

42: conductive circuit

50: plug-in opening

51: insertion opening

52: access opening

53: edge of the inlet opening

60: bonding pad

61: side edge bonding pad

70: stacking component

71L: holding member 2 (an example of the "2 nd stacking member")

71R: 1 st holding member (an example of the "1 st stacking member")

238A: engaging part

339: overhanging locking piece (an example of the "engaging part")

L3: maximum tolerance dimension between protrusions

L4: length dimension of protrusion in extending direction

L5: width of opening

L6: length dimension of projection in orthogonal direction

L21: maximum tolerance dimension between 1 st and 2 nd stacking parts

M, M1: electricity storage module

WM: wiring module