JP2020021550A - Flexible wiring board and battery module - Google Patents

Abstract

To provide a flexible wiring board which is stable in mounted equipment even if vibration is applied and has a sealing function less affected by vibration.SOLUTION: A flexible wiring board 1 set in a case body and used by connecting to external equipment outside the case body includes: a flexible substrate body 13b; a flexible lead-out substrate 13a connected to the substrate body 13b and having a narrower width than the substrate body; a stopper member 17 secured to the lead-out substrate; and a frame member 14 holding the substrate body 13b and having higher flexural rigidity than the substrate body 13b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flexible wiring board and a battery module.

Some battery modules including a battery device use an organic solvent having ion conductivity. In such a battery module, the organic solvent reacts with moisture in the air to generate an acidic gas. In the battery module, it is desirable to strictly prevent the generated gas from leaking out of the device. In particular, in a configuration in which an FPC (Flexible Printed Circuits) substrate having flexibility is incorporated in a battery module and a part thereof is drawn out of the module, a through hole for passing the FPC board drawn out is required. Gas generated in the battery module can leak out through such a through hole.
A known technique for preventing gas from leaking from a through hole of a battery module is described in, for example, Patent Document 1.
In the FPC-integrated gasket described in Patent Document 1, the gasket integrated with the FPC board is provided with a tapered surface that is gradually inclined inward to prevent the gasket from falling out of the through hole in the container wall surface of the battery device.

Utility Model Registration No. 3127071

However, the FPC gasket described in Patent Literature 1 has been devised to be applied to a small communication device. When the FPC gasket described in Patent Literature 1 is used for a battery device such as a vehicle to which stronger vibration is applied, the sealing of the through hole by the gasket is loosened, and gas generated in the battery device flows out through the through hole. There is a fear.
The present invention has been made in view of such a point, and relates to a flexible wiring board and a battery module that are stable in a mounted device even when vibration is applied, and that the vibration has little effect on a sealing function.

  The flexible wiring board of the present invention is a flexible wiring board that is set in a case body and used by being connected to an external device outside the case body, the board body section having flexibility, and the board body section A drawer substrate portion having a width smaller than that of the substrate body portion and having flexibility, a stopper member fixed to the drawer substrate portion, the substrate body portion holding the substrate body portion, A frame member having a bending rigidity larger than that of the frame member.

  Further, the battery module of the present invention, a case body having a through hole in at least one wall surface, a plurality of battery cells housed in the case body, a flexible wiring board electrically connected to the battery cells, Wherein the flexible wiring board comprises: a flexible substrate main body; a drawer substrate connected to the substrate main body, the width being narrower than the substrate main body and having flexibility; and A plug member fixed to the substrate portion and fitted into the through hole; and a frame member holding the substrate body portion and having a bending rigidity larger than that of the substrate body portion.

  The present invention can provide a flexible wiring board and a battery module that are stable in a mounted device even when vibration is applied, and that the vibration has little effect on a sealing function.

It is a perspective view for explaining the battery module of a first embodiment. FIG. 2 is a diagram for explaining the flexible wiring board shown in FIG. 1. (A) is a top view of a flexible wiring board. (B) is a side view of the flexible wiring board shown in (a). (A) is a perspective view of a stopper member. (B) is a rear view of the stopper member. (C) is a front view of the stopper member shown in (b). (A) is a side view of the stopper member shown in FIG. 4 (a). (B) is sectional drawing of the stopper member shown to (a). FIG. 3 is an exploded perspective view of the flexible wiring board shown in FIG. It is a figure for explaining the state where the stopper member of a first embodiment sealed a through-hole. It is a figure for explaining the state where the stopper member of a second embodiment sealed a through-hole. It is a figure for explaining the stopper member of a third embodiment, (a) is a perspective view of a stopper member, (b), (c) is a side view of the stopper member shown in (a). . (A) is sectional drawing of the stopper member shown in FIG.9 (b). (B) is sectional drawing of the stopper member shown to FIG.9 (c). It is a perspective view of the stopper member of the modification of this invention. (A) is a side view of the stopper member of a modification. (B) is sectional drawing of the stopper member shown to (a).

Hereinafter, a first embodiment, a second embodiment, and a third embodiment of the present invention (hereinafter, the first embodiment to the third embodiment are collectively referred to as the present embodiment) will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and redundant description will be omitted as appropriate. Further, the drawings of the present embodiment are for describing the configuration examples and functions of the present invention, and the specific shapes and designs are not limited to the contents of the drawings.
Furthermore, in the present embodiment, the terms “upper”, “lower” and “lower” are all based on a predetermined position or member, and do not always coincide with the direction of gravity.

[First embodiment]
(Battery module)
FIG. 1 is a perspective view illustrating a battery module 10 according to the first embodiment. The illustrated battery module 10 includes a case body 3 having at least one wall member 31 having a through hole 32 (FIG. 5 and the like), a plurality of battery cells 7 housed in the case body 3, and electrically connected to the battery cells. And a flexible wiring board 1 to be used.
The plurality of battery cells 7 constitute a battery group (not shown). On the flexible wiring board 1 are mounted wirings and elements (not shown) that are connected to electrode terminals (not shown) of the battery cells 7 and mainly transmit and receive electric signals to and from the battery cells 7. The electric signal transmitted and received here may be, for example, a signal for monitoring the temperature or current of each battery cell 7 or a signal indicating the temperature measured by a temperature sensor (not shown). The battery group includes a plurality of battery cells 7 arranged in a line, and the battery cells 7 are connected in series. Further, the battery module 10 has a plurality of bus bars 4 arranged on the battery cells 7 and around the flexible wiring board 1.

  The battery cell 7 of the first embodiment is, for example, a lithium ion secondary battery, and includes a separator between a sheet serving as a positive electrode (hereinafter, referred to as a positive electrode plate) and a sheet serving as a negative electrode (hereinafter, referred to as a negative electrode plate). (Hereinafter referred to as an insulating plate). The space between the positive electrode plate and the negative electrode plate is filled with an electrolytic solution. The positive electrode plate is formed by applying a lithium metal oxide such as cobalt (Co), nickel (Ni), and manganese (Mn) to an aluminum foil, for example. The negative electrode plate is formed by applying a carbon-based material such as carbon to a copper foil. The insulating plate is formed of a polyethylene-based or aramid-based material. Ethylene carbonate or gel carbonate is used as the electrolyte. The electrolytic solution can react with moisture in the air to generate various reaction gases. Although the battery cell 7 shown in FIG. 1 has a rectangular shape whose main surface has a rectangular plate shape, the battery cell 7 is not limited to a rectangular shape, and may be a cylindrical type or a laminated type.

  The case body 3 is formed of, for example, an aluminum plate material. A lid (not shown) is further attached to the battery module 10 shown in FIG. 1, and the lid seals an opening of the case body 3, and a space formed by the case body 3 and the lid is airtightly sealed. Can be held.

(Flexible wiring board)
FIG. 2 is a diagram for explaining the flexible wiring board 1 shown in FIG. FIGS. 3A and 3B are enlarged views of a part of the flexible wiring board 1 shown in FIG. 2, and FIG. 3A is a top view of the flexible wiring board 1. is there. FIG. 3B is a side view of the flexible wiring board 1 shown in FIG.
The flexible wiring board 1 has a flexible substrate body 13b and a drawer substrate 13a that is connected to the substrate body 13b and is narrower and more flexible than the substrate body 13b. ing. The board body 13b and the drawer board 13a constitute the board 13 of the flexible wiring board 1. In addition, the flexible wiring board 1 holds the board main body 13b, which is fixed to the drawer board 13a and fits in the through hole 32 (FIG. 5 and the like), and is bent larger than the board main body 13b. And a frame member 14 having rigidity.

The flexible wiring board 1 shown in FIG. 2 has a contact plate 15 partly fixed to the frame member 14 and another part contacting the stopper member 17 from the frame member 14 side. I have.
When the battery module 10 is configured by being accommodated in the case body 3, another part of the frame member 14 elastically urges the stopper member 17.
Further, the flexible wiring board 1 has a connector 11 provided on the drawer board portion 13a and farther from the board main body portion 13b than the stopper member 17.
Hereinafter, the above configuration will be sequentially described.

(Board part)
The board section 13 is composed of a drawer board section 13a and a board main body section 13b. In the first embodiment, hereinafter, in the board portion 13, a direction toward the drawer board portion 13a is referred to as “front”, and a direction opposite to the front is referred to as “rear”. The flexibility of the drawer substrate portion 13a and the substrate main body portion 13b indicates that the substrate can be repeatedly bent and bent. “Bending” in this case refers to a state where the substrate can be elastically deformed in the bending direction and thereafter return to the state before the deformation. The substrate main body 13b and the drawer substrate 13a may be configured by joining substrates of the same material, or may be a series of substrates. Note that the “width” of the board body 13b and the drawer board 13a refers to a length in a direction perpendicular to the direction in which the drawer board 13a is arranged with respect to the board body 13b, and the narrow width is shorter in the width direction. That means.

The substrate body 13b includes a base film having an insulating property and wiring formed on the base film by a printing technique. The wiring electrically connects between the elements mounted on the substrate body 13b or between the elements and an external device. The drawer substrate portion 13a is formed by a base film and wiring printed on the base film, similarly to the substrate main body portion 13b. The wiring of the drawer board portion 13a is electrically connected to the wiring formed on the board main body portion 13b on the one hand, and is electrically connected to the connector 11 on the other hand.
As the base film, for example, a plastic such as PET (polyimide or polyester: PolyEthylene Terephthalate) is used. Copper or copper foil is suitable for the wiring.
The substrate body 13b has a substantially rectangular outer edge, and has a long slot 130 formed therein in a direction perpendicular to the width direction (hereinafter, referred to as “length direction”). The edge 133 of the long hole 130 has a wavy shape. Further, an end 131 of the substrate body 13b on the side of the stopper 17 has a convex shape projecting rearward. Further, the substrate main body 13b has a slit 132 and an escape hole 134. The slits 132 and the escape holes 134 adjust the flexibility of the board body 13b and act as “play” of the board body 13b when assembling the flexible wiring board 1 to the case body 3 or against vibration applied to the flexible wiring board 1. I do.

(Frame member)
The frame member 14 is a member that holds the substrate body 13b from below. In the first embodiment, the outer edge has a rectangular shape like the substrate body 13b, and the edge 143 (FIG. 6) in the length direction. Are formed with wavy elongated holes 140 (FIG. 6). The edge 141 in the width direction of the frame member 14 is linear, and the edge 142 in the length direction is bent inward (to the side of the substrate body 13b), and the end thereof is It bulges above the end. The board main body 13 b does not enter under the bulging portion and does not “float” on the frame member 14.
The bending stiffness of the frame member 14 is greater than the bending stiffness of the substrate 13. The bending stiffness is an index determined by the cross-sectional shape and size of the member and the Young's modulus of the material, and indicates the difficulty of bending deformation of the member in the direction perpendicular to the plane. That is, the frame member 14 prevents the substrate main body 13b from being bent while holding the substrate main body 13b of the substrate 13. As a material of the frame member 14, for example, PET, PC (Poly Carbonate), PMMA (acryl), or the like can be considered.

  Such a frame member 14 suppresses the deformation or movement of the board main body 13 b in the case body 3 even when vibration is applied to the battery module 10, and stabilizes the flexible wiring board 1 in the case body 3. be able to. On the other hand, the frame member 14 does not hold the drawer board 13a and does not hinder the movement of the drawer board 13a. Therefore, in the first embodiment, the board main body 13b is not stably held in the case body 3 and the bending or vibration of the board main body 13b is not transmitted to the drawer board 13a. It can be held in a state adjusted to the position of the through hole 32 while flexing freely.

(Contact plate)
A part of the contact plate 15 is fixed to the frame member 14, and the other part is in contact with the stopper 17. The contact plate 15 of the first embodiment is formed as a plate material bent in two stages, and a portion fixed to the frame member 14 is a fixing portion 152 and a portion that contacts the stopper member 17 is a contact portion 153. . The fixing portion 152 is in a range where the plate member is in contact with the frame member 14, and the contact portion 153 is in a range where the plate member forming the contact plate 15 is in contact with the stopper member 17. The contact portion 153 of the first embodiment has a cross section of a plate material forming the contact plate 15.
A hole 151 is formed in the contact plate 15, and a boss 15 a is provided in the frame member 14. The contact plate 15 is boss-fixed to the frame member 14 by a boss 15a passing through the hole 151.
Such a contact plate 15 may be made of, for example, a resin material or a metal material. When the contact plate 15 is made of a resin, it is preferable to use a resin having a higher hardness than the substrate 13 and a lower hardness than the frame member 14 as the type of the resin. The material of the contact plate 15 is determined according to the preferred biasing force applied to the stopper member 17.

As shown in FIG. 3A, the end 131 of the substrate main body 13b has a cutout shape that curves so as to be recessed rearward. Both ends of the cutout shape extend forward from the frame member 14, and the extended portion 138 is a portion to be gripped by a finger when handling the substrate body 13b. As a result, a part of the frame member 14 overlapping with the substrate portion 13 is exposed, and the contact plate 15 is fixed to the exposed portion of the frame member 14. In the first embodiment, a part of the contact plate 15 extends on the substrate body 13b, and a part of the substrate body 13b is sandwiched between the frame member 14 and the contact plate 15.
In the first embodiment, the stopper member 17 of the flexible wiring board 1 is constantly pressed from the inside of the case body 3 by the contact plate 15 to bring the stopper member 17 into close contact with the surface of the wall member 31 around the through hole 32. High airtightness can be obtained. For this reason, the first embodiment can prevent the gas from flowing through the through-hole 32 with high accuracy.

In the first embodiment, the contact plate is not limited to the above configuration. For example, even if the contact plate cuts parallel to each other from the edge 141 of the frame member 14, the portion of the frame member 14 between the cuts is bent upward to contact the back surface of the stopper member 17. Good. In such a case, it is preferable to extend the edge 141 of the frame member 14 near the end of the extension 138. The cut is preferably parallel to the length direction of the substrate portion 13 and about the length from the edge portion 141 to the end portion 131.
Further, the contact plate may be an elastic member having one end portion detachably fixed to the frame member 14 and the other end contacting the stopper member 17. Further, in the third embodiment, for example, an elastic member is attached to the rear end of the frame member 14, and when the flexible wiring board 1 is accommodated in the case body 3, the elastic member plugs the contact plate 15 of the frame member 14 from behind. It may urge the stop member 17.

(Plug stopper)
4 (a), 4 (b), 4 (c), 5 (a) and 5 (b) are views for explaining the stopper member 17. FIG. FIG. 4A is a perspective view of the stopper 17, FIG. 4B is a side (rear) view of the contact plate 15, and FIG. 4C is a view of FIG. It is the front view which looked at the illustrated stopper member 17 from the front opposite to the back. FIG. 5A is a side view of the stopper member 17 shown in FIG. 4A as viewed in the y direction of the coordinate axis shown in FIG. 4A. FIG. 5B is a cross-sectional view of the cross section of the plugging member 17 taken along the alternate long and short dash line shown in FIG. 4B as viewed in the direction of arrows Vb and Vb. In FIG. 5B, the wall member 31 is indicated by a virtual line.

As shown in FIGS. 4A to 5B, the stopper member 17 has a front surface 73a and a back surface 73b each having a substantially elliptical shape, and a slit 71 penetrating the front surface 73a and the back surface 73b. And a concave groove 72 formed on the back surface 73b. The slit 71 may be a through groove through which the board body 13b is inserted so as not to slide. In such a case, the gap between the slit 71 and the board body 13b is filled with an adhesive and It prevents gas distribution. In the first embodiment, the stopper member 17 may be integrally formed around the substrate body 13b.
The concave groove 72 is a long groove for positioning that prevents the contact position of the contact plate 15 from shifting when the contact plate 15 comes into contact with the back surface 73b of the stopper member 17. The length of the concave groove 72 may be equal to or longer than the length of the contact portion 153 in the width direction, and does not need to exactly match.

Further, in the stopper member 17, the size (diameter of an ellipse) of the outer edge of the peripheral surface between the front surface 73a and the back surface 73b changes in multiple steps. Specifically, the peripheral surface between the front surface 73a and the rear surface 73b includes the peripheral surface portions 74, 75, 76, 77 and the peripheral surface portion 78. In the stopper member 17, the direction toward the connector, the −z direction (not shown) in FIGS. 4A and 5A is described as “front”, and the direction opposite to the −z direction is described as “rear”. .
Specifically, the outer edge of the peripheral surface portion 78 of the peripheral surface portion of the stopper member 17 is constant and coincides with the outer edge of the back surface 73b. The outer edge of the peripheral surface portion 76 is constant and smaller than the outer edge of the peripheral surface portion 78. The outer edge of the peripheral surface portion 77 changes so as to have the convex portion P1, and becomes maximum at the vertex of the convex portion P1, and the minimum outer edge is smaller than the outer edge of the peripheral surface portion 76.

The outer edge of the peripheral surface portion 75 is constant and coincides with the minimum outer edge of the peripheral surface portion 77. The outer edge of the peripheral surface portion 74 changes so as to decrease from the rear to the front with a certain inclination, and the maximum outer edge coincides with the outer edge of the peripheral surface portion 75. The minimum outer edge of the peripheral surface portion 74 coincides with the outer edge of the front surface 73a.
As described above, the stopper member 17 in which the outer edge of the peripheral surface changes has a configuration in which the outer shape gradually decreases from the rear to the front. Such a stopper member 17 is suitable for being inserted into the through hole 32 of the wall member 31 from the inside from the inside of the case body 3 to seal the through hole 32 from the inside of the case body 3.

The stopper member 17 includes at least two members having different hardnesses. In the first embodiment, the two members are a first stopper member B and a second stopper member A made of a material having a lower hardness than the first stopper member. The second stopper member A covers at least a part of the first stopper member B.
As shown in FIG. 5B, in the plugging member 17, the second plugging member A forms a part of the peripheral surface portion 78, the peripheral surface portion 76, and the peripheral surface portion 77. The first stopper member B constitutes a part of the peripheral surface 78, the peripheral surface 75, and the peripheral surface 74.
In the first embodiment, the above-mentioned convex portion P1 is configured by the second stopper member A. For this reason, in the first embodiment, the outer edge of the peripheral surface portion 77 having the convex portion P1 is designed to be slightly larger than the inner edge of the through hole 32, and the peripheral surface portion 77 is pressed into the through hole 32 while being elastically deformed. The high airtightness in 3 can be maintained.

  The first stopper member B can be made of, for example, resin, and the second stopper member A can be made of, for example, rubber. Examples of the resin applicable to the first stopper member B include PET, PC, PMMA, PBT (PolyButylene Terephthalate) and PTFE (Fluorine resin: (PolyTetraFluoroEthylene)). Examples of the rubber material applicable to the member A include nitrile rubber, hypalon, acrylic rubber, urethane rubber, silicon rubber, etc. Further, in the first embodiment, such a resin or rubber is used as the stopper member 17. Processing may be appropriately performed so as to have preferable characteristics, or another material may be added.

  The stopper member 17 of the first embodiment described above is made of a material having a relatively high hardness so that it is difficult for gas to pass therethrough. In addition, the stopper member 17 is provided with rubber having a lower hardness than the resin at a position in contact with the wall member 31 so as to enhance the adhesion to the wall member 31 and the through hole 32 and to seal the through hole 32 with high precision. be able to.

(connector)
The connector 11 may be any connector as long as it electrically connects the drawer board 13a to an external device (not shown). However, when the manufacturer of the battery module 10 receives the flexible wiring board 1 from the provider of the flexible wiring board 1, the manufacturer does not want to perform the step of connecting the drawer board portion 13a and the connector 11. There is. Therefore, in the first embodiment, the provider provides the manufacturer with the flexible wiring board 1 to which the connector 11 is connected, and the manufacturer places the connector 11 in the through hole 32 from the inside of the case body 3 to the outside. And set it through. In such a case, the connector 11 is required to have a dimensional shape that can be inserted into the through hole.

FIG. 6 is an exploded perspective view of the flexible wiring board 1 assembled by the configuration described above. In the first embodiment, first, the stopper member 17 is attached to the drawer substrate portion 13a by integrally molding or bonding with an adhesive. On the other hand, the contact plate 15 is boss-fixed to the frame member 14. Next, the board portion 13 provided with the stopper member 17 is set on the frame member 14, and the drawn-out board portion 13 a is inserted into the through hole 32 from the inside I to the outside O together with the stopper member 17. Is sealed. At this time, in the flexible wiring board 1, the frame member 14 is set such that the contact portion 153 of the contact plate 15 contacts the concave groove 72 of the plug stopper 17. Further, the connector 11 is attached to an end of the drawer board 13a.
With the configuration described above, the first embodiment enables the positioning of the flexible wiring board 1 with respect to the case body 3 and improves the accuracy thereof.

  FIG. 7 is a view for explaining a state in which the stopper member 17 seals the through hole 32. FIG. 7 schematically shows a vertical cross section of the case body 3 on which the flexible wiring board 1 is set, which is cut along the length direction of the board portion 13. In the first embodiment, the stopper member 17 is inserted through the through hole 32 from the inner side I to the outer side O of the case body 3. Therefore, in the first embodiment, the peripheral surface portion 78 of the stopper member 17 comes into contact with the wall member 31 from the inside I, and seals the through hole 32.

In the first embodiment described above, the board portion 13 is configured by the board body portion 13b having flexibility and the drawer board portion 13a, and the stopper member is fixed to the drawer board portion 13a. On the other hand, the substrate body 13b is held by a frame member having a greater bending rigidity than the substrate body 13b. By doing so, in the first embodiment, even when vibration is applied to the substrate main body 13b, the frame member 14 can suppress this vibration. Therefore, the flexible wiring board 1 is stable in the case body 3 of the battery module 10 and does not loosen the sealing portion due to the vibration, so that the influence of the vibration on the sealing function can be reduced.
Further, in the first embodiment, since the restricting force of the frame member 14 does not reach the drawer board 13a, the drawer board 13a can be routed in accordance with the design of the case body 3. In the first embodiment, the convenience of using the flexible substrate while suppressing the vibration of the substrate body 13b is not lost. Further, in the first embodiment, the stopper plate 17 can be constantly urged by the contact plate 15. Therefore, in the first embodiment, the tightness between the stopper member 17 and the wall member 31 can be enhanced, and the confidentiality of the case body 3 can be enhanced.

[Second embodiment]
Next, a second embodiment of the present invention will be described. Drawing 8 is a figure for explaining battery module 20 using a flexible wiring board of a second embodiment, and is a figure for explaining a state where a stopper member of a second embodiment has sealed a through-hole. It is.
The battery module 20 of the second embodiment further includes a connection fixing part 135 that connects the drawer board part 13a and the board main body part 13b.
That is, in the second embodiment, the drawer board 13a and the board main body 13b are separated from each other before being assembled into the case body 3, and the stopper member 17 and the connector 11 are provided on the drawer board 13a. At this time, in the second embodiment, the stopper member 17 is attached to the drawer board portion 13a such that the front surface 73a and the back surface 73b of the stopper member 17 are in the opposite directions to the first embodiment. That is, in the second embodiment, the stopper member 17 is attached so that the back surface 73b faces the connector 11 and the front surface 73a faces the substrate body 13b. In the second embodiment, a mechanism relating to the contact plate 15 is not provided since the second embodiment works to release the sealing by the stopper member 17. The drawer board portion 13 a is set in the case body 3 while being held by the frame member 14.

  In the process of assembling the battery module 20, the drawer board portion 13a provided with the connector 11 and the stopper member 17 and the board body portion 13b set on the frame member 14 are separately received, and the frame member 14 and the board body portion are received. After the case 13b is set in the case body 3, the stopper member 17 is fitted into the through-hole 32 from the outside O of the case body 3 so as to seal the through-hole 32. Then, the drawn-out board portion 13a and the board body portion 13b are joined by, for example, resin welding. The method of resin welding is arbitrary, but for example, hot air welding or the like is conceivable.

  In addition, the joining between the drawn-out board portion 13a and the board main body portion 13b of the second embodiment is not limited to hot-air welding, and may be, for example, a method of bonding the both using an adhesive or an adhesive tape. Alternatively, it may be soldered. Furthermore, in the second embodiment, for example, a male connector is formed in the drawer board 13a and a female connector is formed in the board main body 13b in advance, and both are connected to electrically connect the wirings on the board. It may be something.

[Third embodiment]
Next, a third embodiment of the present invention will be described. FIGS. 9A, 9B, and 9C are views for explaining the stopper member 16 of the third embodiment. 9A is a perspective view of the stopper member 16, and FIGS. 9B and 9C show the stopper member 16 shown in FIG. 9A in the y direction of the coordinate axis shown in FIG. 9A. It is the side view seen. FIG. 10A is a cross-sectional view of the stopper member 16 shown in FIG. 9B cut along a yz plane passing through the slit 61. FIG. 10B is a cross-sectional view of the stopper member 16 shown in FIG. 9C cut along the yz plane passing through the slit 61.
9 (b), 9 (c), 10 (a) and 10 (b), the wall member 31 is indicated by a two-dot chain line in the drawings, and the plug member 16 is the wall member 31. 1 shows a state in which it is attached to the camera. 9B shows a state in which the stopper member 16 is attached to the through hole 32 of the wall member 31 from the inside I of the case body 3, and FIG. The state where the stopper member 16 was attached to the through hole 32 of the member 31 is shown. The plugging member 16 of the third embodiment can be attached to the wall member 31 from either the inside or the outside of the wall member 31 by reversing the direction of attachment to the drawer substrate 13a.

  The stopper member 16 of the third embodiment has a stopper main body and a flange part integrated with the stopper main body. 9 (a), 9 (b), and 9 (c) has a front surface 63a and a back surface 63b, and a slit 61 penetrating the front surface 63a and the back surface 63b. have. In the stopper member 16 shown in FIG. 9A, a concave groove 62 (FIG. 10A) with which the contact portion 153 contacts is formed on the back surface 63b. The peripheral surface between the front surface 63a and the rear surface 63b of the stopper member 16 has a plurality of peripheral surface portions 66, 68, 67, 69, in which the size of the outer edge is different in multiple stages and the size of the outer edge is different. 66 and a peripheral surface portion 65. Among them, in the third embodiment, the peripheral surface portion 68 that comes into contact with the front surface (the outer O surface) or the rear surface (the inner I surface) of the wall member 31 is referred to as a “flange”. The peripheral surface portion 68 serving as a flange has a peripheral surface portion 67. In the third embodiment, the peripheral surface portion 69 of the peripheral surface portion excluding the peripheral surface portion 68 and the peripheral surface portion 67 is defined as a “plug body”.

  The peripheral surface 68 serving as a flange is designed to be larger than the through hole 32 and cannot enter the through hole 32. Therefore, the peripheral surface portion 68 is a plate member that is in contact with the surface on the inner side I of the wall member 31. The peripheral surface portion 67 is smaller in size toward the peripheral surface portion 69 from the size where the outer edge matches the outer edge of the peripheral surface portion 68. The peripheral surface portion 67 changes so that the outer edge has the convex portion P2. The peripheral surface portion 69 has the maximum outer edge at the vertex of the convex portion P3, and the minimum outer edge is smaller than the outer edge of the peripheral surface portion 67. ing. The outer edge of the peripheral surface 66 is constant and coincides with the smallest outer edge of the peripheral surface 69. The outer edge of the peripheral surface portion 65 is reduced with a certain inclination toward the front surface 63a from a size matching the outer edge of the peripheral surface portion 66.

9 (b), 9 (c), 10 (a) and 10 (b), the stopper member 16 can be attached to the wall member 31 from the inside I or from the outside O. It is possible. When the stopper member 16 is attached to the wall member 31 from the inside I, the drawn-out board portion 13a and the board main body portion 13b form the board portion 13 before being assembled into the case body 3. The stopper member 16 is attached on the drawer board portion 13a such that the back surface 63b faces the substrate body portion 13b.
When the stopper member 16 is attached to the wall member 31 from the outside O, the drawer board portion 13a and the board main body portion 13b are separate before being incorporated into the case body 3. The drawn-out board portion 13a is connected to the board body portion 13b after the board body portion 13b is set in the case body 3 together with the frame member 14. In such a case, the stopper member 16 is attached so that the front surface 63a faces the substrate body 13b side on the drawer substrate 13a after the connection between the drawer substrate 13a and the board main body 13b.

In the present specification, the direction in which the stopper member 16 moves away from the substrate body 13b will be described as a forward direction, and the direction opposite to the forward direction will be described as a backward direction. Here, the forward direction refers to the −z direction opposite to the z direction shown in FIG. 12A, and the backward direction refers to the z direction shown in FIG. 12A.
As shown in FIGS. 9B and 10A, in the third embodiment, the peripheral surface portion 68 as the flange portion is provided in the retreating direction from the peripheral surface portion 65 as the plug body with respect to the peripheral surface portion 69. The stop member 16 is configured, and the convex portion P2 of the peripheral surface portion 67 functions as a first projecting portion that projects in the forward direction. That is, in the third embodiment, as shown in FIG. 10A, when the stopper member 16 is attached to the wall member 31 from the inside I of the case body 3, the convex portion P2 of the peripheral surface portion 67 projects in the forward direction. I do.

  In addition, as shown in FIGS. 9C and 10B, in the third embodiment, a peripheral surface portion 68 which is a flange portion is provided in a forward direction from a peripheral surface portion 65 which is a plug body to a peripheral surface portion 69. The stopper member 16 is configured, and the protruding portion P2 of the peripheral surface portion 67 functions as a second protruding portion that protrudes in the retreating direction. That is, in the third embodiment, when the stopper member 16 is attached to the wall member 31 from the outside O of the case body 3 as shown in FIG. 10B, the convex portion P2 of the peripheral surface portion 67 projects in the retreating direction. I do.

When the stopper member 16 is attached to the wall member 31 from the inside I side, such a convex portion P2 presses the wall member 31 from the inside when the inside I of the case body 3 is in a pressurized state. Thus, the through hole 32 can be self-sealed. Further, when the stopper member 16 is attached to the wall member 31 from the outside O side, when the inside I of the case body 3 is in a negative pressure state, the convex-shaped portion P2 is pressed from the outside by the wall member 31. Thus, the through hole 32 can be self-sealed.
As described above, in the third embodiment, even if the pressure inside the case body 3 fluctuates, the inside of the case body 3 can be reliably sealed.

  Further, in the third embodiment, as described above, the stopper member 16 has the plug main body (from the peripheral surface portion 65 to the peripheral surface portion 69) and the flange portion (the peripheral surface portion 68) integrated with the main body. The plug main body has a convex part P3 which is a third protruding part protruding in a direction intersecting with the forward direction away from the substrate main body part 13b. According to such a third embodiment, even when vertical vibration is applied to the case body 3, the stopper member 16 and the through hole 32 are less likely to come off, and the stopper member 16 seals the inside of the case body 3. The reliability of stopping can be improved.

  In the third embodiment, as shown in FIGS. 10A and 10B, the convex portions P2 and P3 of the stopper member 16 are different from other portions (hereinafter, referred to as “main body”). It is a member. The convex portions P2 and P3 are made of an elastic body having a lower hardness than the other portions. In such a configuration, the main body may be made of resin and the main body may be provided with rubber convex portions P2 and P3, or the main body may be provided with O-rings to form the convex portions P2 and P3. It may be something. In the third embodiment, the main body corresponds to the first stopper member B, and the convex portions P2 and P3 correspond to the second stopper member A. Further, the main body of the third embodiment may be formed integrally, or may be a combination of a plurality of parts.

[Modification]
FIGS. 11, 12A and 12B are views for explaining a stopper member 19 of a modified example. FIG. 11 is a perspective view of a stopper member 19 of a modified example, and FIG. 12A is a side view of the stopper member 19 shown in FIG. 11 as viewed in the y direction of the coordinate axis shown in FIG. FIG. 12B is a cross-sectional view taken along the xz plane of the coordinate axis on the slit 91 of the stopper member 19 shown in FIG. Also in the modified example, the −z direction (not shown) in FIGS. 11 and 12A is described as “front”, and the z direction opposite to the −z direction is described as “rear”.
In the modified example, the stopper member 19 is fitted into the through hole 32 from the inside I of the case body 3 as in the first embodiment, so that the front surface 93a of the stopper member 19 faces the connector 11 side. The back surface 93b is a surface facing the substrate body 13b. The stopper member 19 has a slit 91 penetrating the front surface 93a and the back surface 93b. The slit 91 may be a through groove through which the substrate main body 13b is inserted so as not to slide, and the stopper member 19 may be formed integrally with the periphery of the substrate main body 13b.
On the back surface 93b, a concave groove 92 used for positioning to be in contact with the contact portion 153 of the contact plate 15 is formed.

  As shown in FIGS. 12A and 12B, the peripheral surface of the stopper member 19 includes a plurality of peripheral surface portions 98, 97, 96, 95, 94, 90 and a peripheral surface portion 99 having different outer edges. Contains. The outer edge of the peripheral surface portion 98 increases with a constant inclination from the rear to the front of the stopper member 19. The outer edge of the peripheral surface portion 97 is constant, and the outer edge of the peripheral surface portion 96 decreases with a constant inclination from the rear to the front. The outer edge of the peripheral surface 95 is constant and smaller than the outer edge of the peripheral surface 96, and the outer edge of the peripheral surface 94 is constant and smaller than the outer edge of the peripheral surface 95. The outer edge of the peripheral surface portion 90 is constant and equal to the outer edge of the peripheral surface portion 95, and the outer edge of the peripheral surface portion 99 decreases with a constant inclination from the rear to the front.

  In the present modification, the portions including the peripheral surface portions 98, 97, 96, 95, 94, 90 and the peripheral surface portion 99 are all made of a resin having relatively high hardness, and a rubber O-ring 5 is formed around the peripheral surface portion 94. Is fitted. It can be said that the stopper member 19 having such a configuration includes at least two members having different hardnesses, similarly to the stopper member 17.

The above embodiments and examples include the following technical ideas.
(1) A flexible wiring board which is set on a case body and used by being connected to an external device outside the case body, wherein the flexible wiring board is connected to the board body section and has flexibility. A drawer substrate portion that is narrower and more flexible than the substrate body portion, a stopper member fixed to the drawer substrate portion, and a bending rigidity that holds the substrate body portion and is larger than the substrate body portion. A flexible wiring board comprising:
(2) The flexible wiring board according to (1), further including a contact plate partially fixed to the frame member, and another part of which is in contact with the stopper member from the frame member side.
(3) The flexible wiring board according to (1), further including a connection fixing part that connects the drawer board part and the board main body part.
(4) The stopper member is a first stopper member, and a second stopper member made of a material having a lower hardness than the first stopper member and covering at least a part of the first stopper member. And the flexible wiring board according to any one of (1) to (3).
(5) A direction in which the stopper member moves away from the substrate body is defined as a forward direction, and a direction opposite to the forward direction is defined as a backward direction. The stopper member includes a stopper body, and a flange part integrated with the stopper body. (1) to (4), wherein the flange portion is provided in the retreating direction with respect to the plug main body, and the flange portion has a first protrusion protruding in the forward direction. One flexible wiring board.
(6) A direction in which the stopper member moves away from the substrate main body portion is defined as a forward direction, and a direction opposite to the forward direction is defined as a retreat direction. The stopper member includes a stopper body, and a flange portion integrated with the stopper body. (1) to (4), wherein the flange portion is provided in the forward direction with respect to the plug main body, and the flange portion has a second projecting portion projecting in the retreating direction. One flexible wiring board.
(7) The stopper member has a stopper main body and a flange part integral with the main body, and the stopper main body has a third protruding part protruding in a direction intersecting with a forward moving direction away from the substrate main body part. The flexible wiring board according to any one of (1) to (6).
(8) The flexible wiring board according to any one of (1) to (7), further including a connector provided on the drawer board portion and farther from the board main body portion than the stopper member.
(9) The flexible wiring, comprising: a case body having a through hole in at least one wall surface; a plurality of battery cells housed in the case body; and a flexible wiring board electrically connected to the battery cells. The substrate is connected to the substrate main body portion having flexibility, the drawer substrate portion having a width smaller than the substrate main body portion and having flexibility, and being fixed to the drawer substrate portion. A battery module comprising: a stopper member that fits into the through hole; and a frame member that holds the substrate main body and has a greater bending rigidity than the substrate main body.
(10) The battery module according to (9), wherein a part of the frame member is fixed to the frame member, and another part of the frame member further includes a contact plate that elastically urges the stopper member.

Flexible wiring board ... 1
Case body ... 3
Bus bar ... 4
Battery cell ... 7
Battery module ... 10, 20
Connector ... 11
Substrate part ... 13
Pull-out board part ... 13a
Substrate body ... 13b
Frame members ... 14
Contact plate ... 15
Boss ... 15a
Plug stoppers ... 16, 17, 19
Wall members ... 31
Through hole ... 32
Slits ... 61, 71, 91
Front ... 63a, 73a, 93a
Back side ... 63b, 73b, 93b
Peripheral surface part ... 65, 66, 67, 68, 69, 74, 75, 76, 77, 78, 90, 94, 95, 96, 97, 98, 99
Groove ... 72
Slots ... 130, 140,
End ... 131
Slit ... 132
Edges ... 133, 141, 142
Escape hole ... 134
Connection fixing part ... 135
Hole ... 151
Fixed part ... 152
Contact part ... 153
Second stopper member ... A
First stopper member ... B
Inside ... I
Outside ... O
Convex part ... P1, P2, P3

Claims (10)

A flexible wiring board which is used by being set on a case body and connected to an external device outside the case body,
A substrate body having flexibility,
A drawer substrate portion connected to the substrate body portion and having a smaller width and flexibility than the substrate body portion;
A stopper member fixed to the drawer substrate portion,
A frame member that holds the substrate main body and has a bending rigidity larger than that of the substrate main body,
A flexible wiring board comprising:   2. The flexible wiring board according to claim 1, further comprising a contact plate partially fixed to the frame member and another part contacting the stopper member from the frame member side. 3.   2. The flexible wiring board according to claim 1, further comprising a connection fixing part that connects the drawer board part and the board main body part. 3.   The stopper member includes a first stopper member and a second stopper member made of a material having a lower hardness than the first stopper member and covering at least a part of the first stopper member. The flexible wiring board according to any one of claims 1 to 3. The direction in which the stopper member moves away from the substrate main body portion is a forward direction, and a direction opposite to the forward direction is a retreat direction,
The stopper member has a stopper body and a flange part integral with the stopper body, the flange part is provided in the retreat direction with respect to the stopper body, and the flange part is in the forward direction. The flexible wiring board according to any one of claims 1 to 4, further comprising a first protruding portion that protrudes. The direction in which the stopper member moves away from the substrate main body portion is a forward direction, and a direction opposite to the forward direction is a retreat direction,
The stopper member has a stopper body and a flange part integral with the stopper body, the flange part is provided in the forward direction with respect to the stopper body, and the flange part is in the retreat direction. The flexible wiring board according to any one of claims 1 to 4, further comprising a second projecting portion that projects. The stopper member has a stopper main body and a flange part integrated with the stopper main body,
The flexible wiring board according to any one of claims 1 to 6, wherein the plug main body has a third protruding portion that protrudes in a direction intersecting a forward direction away from the substrate main body.   The flexible wiring board according to any one of claims 1 to 7, further comprising a connector provided on the drawer board portion and at a position farther from the board main body portion than the stopper member. A case body having a through hole in at least one wall surface,
A plurality of battery cells housed in the case body;
A flexible wiring board electrically connected to the battery cell,
The flexible wiring board has a flexible substrate main body, a drawer substrate connected to the substrate main body, having a width smaller than the substrate main body and having flexibility, and A plug member fixedly fitted in the through hole, and a frame member holding the substrate main body and having a bending rigidity larger than that of the substrate main body,
Battery module.   The battery module according to claim 9, wherein the frame member further includes a contact plate partially fixed to the frame member and another portion elastically biasing the stopper member.

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