Flexible wiring components and conductive modules

Abstract

To provide a flexible wiring component and a conductive module having a good yield.SOLUTION: A first main branch wiring portion 1a is bent at a first main branch bending portion 1d at a boundary between one end portion the first main branch wiring portion and one end portion of a coupling wiring portion 1c, and is extended in an arrangement direction of a plurality of battery cells BC. A second main branch wiring portion 1b is bent at a second main branch bending portion 1e at a boundary between one end portion of the second main branch wiring portion and the other end portion of the coupling wiring portion, and is extended in the arrangement direction. The coupling wiring portion 1c includes: a main coupling wiring portion 1f; a first sub-coupling wiring portion 1g that electrically connects the main coupling wiring portion and the first main branch wiring portion via the first main branch bending portion; and a second sub-coupling wiring portion 1h that electrically connects the main coupling wiring portion and the second main branch wiring portion via the second main branch bending portion. The first sub-coupling wiring portion is bent at a first sub-branch bending portion 1i that branches off from the main coupling wiring portion and is extended to the one end portion of the first main branch wiring portion, and the second sub-coupling wiring portion is bent at a second sub-branch bending portion 1j that branches off from the main coupling wiring portion and is extended to the one end portion of the second main branch wiring portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flexible wiring component and a conductive module. [Background technology]

[0002] Conventionally, vehicles (such as electric vehicles and hybrid vehicles) powered by a rotating machine are equipped with a battery module that supplies power to the rotating machine and a battery monitoring unit that monitors the battery status of the multiple battery cells that make up the battery module. The vehicle is also equipped with a flexible wiring component that electrically connects the battery module and the battery monitoring unit. Here, the battery module is an array of multiple battery cells, each with positive and negative electrode terminals, arranged on the same plane. The battery module has a first electrode terminal group in which one electrode terminal is arranged in the array direction and pairs of adjacent electrode terminals in the array direction are electrically connected by a first terminal-to-terminal connector for each pair of electrode terminals, and a second electrode terminal group in which the other electrode terminal is arranged in the array direction and pairs of adjacent electrode terminals in the array direction are electrically connected by a second terminal-to-terminal connector for each pair of electrode terminals. For this reason, the flexible wiring component includes a first main branch wiring portion between the first electrode terminal group and the second electrode terminal group, which is close to the first electrode terminal group and electrically connects each of the first inter-terminal connecting components, and a second main branch wiring portion between the first electrode terminal group and the second electrode terminal group and which is close to the second electrode terminal group and electrically connects each of the second inter-terminal connecting components. For example, Patent Document 1 listed below discloses such a flexible wiring component. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-74179 Summary of the Invention [Problem to be solved by the invention]

[0004] Known flexible wiring components of this type include those configured as a single component, i.e., those in which a first main branch wiring section and a second main branch wiring section are integrally molded via a connecting wiring section. For example, this flexible wiring component includes a voltage detection line for each first terminal-connecting component routed between the first main branch wiring section and the connecting wiring section between the first terminal-connecting component side and the battery monitoring unit side, a voltage detection line for each second terminal-connecting component routed between the second main branch wiring section and the connecting wiring section between the second terminal-connecting component side and the battery monitoring unit side, and an insulating coating that encapsulates all of the voltage detection lines. Specifically, this flexible wiring component includes a base film and a coverlay film for each surface that covers the surface of the base film as the insulating coating, and the voltage detection lines are routed on at least one surface of the base film.

[0005] For example, this flexible wiring component is one of several die-cut from a single sheet-like base material (a laminate of a first film serving as a base film, voltage detection lines for each flexible wiring component routed on the surface of the first film, and a second film serving as a coverlay film covering each surface of the first film). The flexible wiring component shown here has a space surrounded by the first main branch wiring section, the second main branch wiring section, and the connecting wiring section. The larger the distance between the first electrode terminal group and the second electrode terminal group, the larger the distance between the first main branch wiring section and the second main branch wiring section, resulting in a larger space. Therefore, the larger the distance between the first electrode terminal group and the second electrode terminal group, the more likely it is that the portion of the base material corresponding to the space will be wasted. Thus, conventional flexible wiring components have room for improvement in terms of yield.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a flexible wiring component and a conductive module with a high yield. [Means for solving the problem]

[0007] The flexible wiring component according to the present invention comprises a battery module in which a plurality of battery cells are arranged in a row, and a battery monitoring unit that monitors the battery state of each of the battery cells. The battery module has a group of voltage detection wires enclosed in an insulating coating and formed flat and flexible. The battery cells have positive and negative electrode terminals provided on the same plane at intervals on the cell body. The battery module is arranged such that one of the electrode terminals of each of the battery cells is aligned in the direction of the arrangement of the plurality of battery cells, and the electrode terminals of each of the battery cells are aligned in the direction of the arrangement. a first electrode terminal group in which adjacent pairs of the one electrode terminals are electrically connected by a first terminal-to-terminal connection part for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminals of each of the battery cells are arranged in the arrangement direction and adjacent pairs of the other electrode terminals in the arrangement direction are electrically connected by a second terminal-to-terminal connection part for each of the pair of the other electrode terminals, and the voltage detection line group is provided for each of the first terminal-to-terminal connection parts and is a first voltage detection line group that electrically connects the first terminal-to-terminal connection part and the battery monitoring unit. and a second voltage detection line provided for each of the second inter-terminal connection components, electrically connecting the second inter-terminal connection components and the battery monitoring unit, wherein the wiring main body has a first main branch wiring portion extending in the arrangement direction close to the first electrode terminal group between the first electrode terminal group and the second electrode terminal group, a second main branch wiring portion extending in the arrangement direction close to the second electrode terminal group between the first electrode terminal group and the second electrode terminal group, one end portion connected to one end portion of the first main branch wiring portion and the other end portion connected to one end portion of the second main branch wiring portion, and a connecting wiring portion that connects the one ends of the first main branch wiring portion and the second main branch wiring portion to each other and electrically connects them to the battery monitoring unit, wherein the first main branch wiring portion is bent at a first main branch bending portion at a boundary between the one end of the first main branch wiring portion and the one end of the connecting wiring portion and extends in the arrangement direction, and the second main branch wiring portion is bent at a second main branch bending portion at a boundary between the one end of the second main branch wiring portion and the other end of the connecting wiring portion and extends in the arrangement direction, and the connecting wiring portion includes a main connecting wiring portion that is electrically connected to the battery monitoring unit and is branched from the main connecting wiring portion,a first sub-connecting wiring portion connected to the one end of the first main branch wiring portion via the first main branch bending portion to electrically connect the main connecting wiring portion and the first main branch wiring portion; and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bending portion to electrically connect the main connecting wiring portion and the second main branch wiring portion, wherein the first sub-connecting wiring portion is bent at the first sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the first main branch wiring portion, and the second sub-connecting wiring portion is bent at the second sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, the insulating coating comprises a base film and a coverlay film for each surface that covers the surface of the base film; the first voltage detection wire has a first terminal-side routing portion that is routed on one surface of the base film and electrically connected to the first terminal-to-terminal connecting component, a first mating-side routing portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit, and a first circuit replacement portion that electrically connects the first terminal-side routing portion and the first mating-side routing portion via a through-hole in the base film in the connecting wiring portion; and the second voltage detection wire has a second terminal-side routing portion that is routed on one surface of the base film and electrically connected to the second terminal-to-terminal connecting component, a second mating-side routing portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit, and a second circuit replacement portion that electrically connects the second terminal-side routing portion and the second mating-side routing portion via a through-hole in the base film in the connecting wiring portion. It is characterized by: The flexible wiring component according to the present invention comprises a battery module in which a plurality of battery cells are arranged in a row, and a battery monitoring unit that monitors the battery state of each of the battery cells. The battery module has a group of voltage detection wires enclosed in an insulating coating and is formed flat and flexible. The battery cells have positive and negative electrode terminals provided on the same plane on the cell body, one each at intervals, and the battery module is arranged in the direction in which the plurality of battery cells are arranged, with one of the electrode terminals of each of the battery cells aligned in the direction in which the battery cells are arranged. and a second electrode terminal group in which the other electrode terminals of each of the battery cells are arranged in the arrangement direction and the other electrode terminals of each of the battery cells adjacent in the arrangement direction are electrically connected by a second terminal-to-terminal connection part for the other electrode terminals of the pair, and the voltage detection line group is provided for each of the first terminal-to-terminal connection parts and is a first terminal-to-terminal connection part that electrically connects the first terminal-to-terminal connection part and the battery monitoring unit. and a second voltage detection line provided for each of the second inter-terminal connection parts, electrically connecting the second inter-terminal connection parts and the battery monitoring unit, wherein the wiring main body has a first main branch wiring portion extending in the arrangement direction close to the first electrode terminal group between the first electrode terminal group and the second electrode terminal group, a second main branch wiring portion extending in the arrangement direction close to the second electrode terminal group between the first electrode terminal group and the second electrode terminal group, one end portion connected to one end portion of the first main branch wiring portion and the other end portion connected to one end portion of the second main branch wiring portion, and a connecting wiring portion that connects the one ends of the first main branch wiring portion and the second main branch wiring portion to each other and electrically connects them to the battery monitoring unit, wherein the first main branch wiring portion is bent at a first main branch bending portion at a boundary between the one end of the first main branch wiring portion and the one end of the connecting wiring portion and extends in the arrangement direction, and the second main branch wiring portion is bent at a second main branch bending portion at a boundary between the one end of the second main branch wiring portion and the other end of the connecting wiring portion and extends in the arrangement direction, and the connecting wiring portion includes a main connecting wiring portion that is electrically connected to the battery monitoring unit and is branched from the main connecting wiring portion,a first sub-connecting wiring portion connected to the one end of the first main branch wiring portion via the first main branch bend portion, thereby electrically connecting the main connecting wiring portion and the first main branch wiring portion; and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bend portion, thereby electrically connecting the main connecting wiring portion and the second main branch wiring portion, wherein the first sub-connecting wiring portion is bent at the first sub-connecting bending portion branched from the main connecting wiring portion and extends to the one end of the first main branch wiring portion, and the second sub-connecting wiring portion is branched from the main connecting wiring portion the first main branch wiring section is bent at a second sub-branch bending section at the end of the first main branch wiring section and then extended to the one end of the second main branch wiring section, and at least one of the first main branch wiring section and the second main branch wiring section, which is the main branch wiring section to be added to the circuit, has an added circuit wiring section that protrudes from an end on the side of a space surrounded by the first main branch wiring section, the second main branch wiring section, and the connecting wiring section and is folded back 180 degrees from a base section on this end side and overlaps the main branch wiring section to be added to the circuit, and the group of voltage detection lines includes the first voltage detection line or the second voltage detection line in the main branch wiring section to be added to the circuit

[0008] Furthermore, a conductive module according to the present invention comprises a flexible wiring component, a first terminal-to-terminal connection component, a second terminal-to-terminal connection component, and a case that receives the flexible wiring component, the first terminal-to-terminal connection component, and the second terminal-to-terminal connection component through an opening, wherein the flexible wiring component comprises a wiring main body that is formed flat and flexible and includes an insulating coating that encloses a group of voltage detection wires that electrically connect a battery module in which a plurality of battery cells are arranged in a row to a battery monitoring unit that monitors the battery state of each of the battery cells, and the battery cells each have a flat, uniform surface that is formed on the same flat surface at the cell main body. The battery module has a first electrode terminal group in which one electrode terminal of each of the battery cells is arranged in the arrangement direction of the plurality of battery cells, and a pair of the one electrode terminals adjacent to each other in the arrangement direction are electrically connected by the first inter-terminal connection parts for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminal of each of the battery cells is arranged in the arrangement direction, and a pair of the other electrode terminals adjacent to each other in the arrangement direction are electrically connected by the first inter-terminal connection parts for each of the pair of the other electrode terminals. and a second electrode terminal group electrically connected by the second terminal-to-terminal connection parts, wherein the voltage detection line group comprises a first voltage detection line provided for each of the first terminal-to-terminal connection parts and electrically connecting the first terminal-to-terminal connection parts and the battery monitoring unit, and a second voltage detection line provided for each of the second terminal-to-terminal connection parts and electrically connecting the second terminal-to-terminal connection parts and the battery monitoring unit, and the wiring main body comprises a first main branch wiring section extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the first electrode terminal group; a second main branch wiring section extending in the arrangement direction between a terminal group and the second electrode terminal group and close to the second electrode terminal group; and a connecting wiring section having one end continuing to one end of the first main branch wiring section and the other end continuing to one end of the second main branch wiring section, connecting the one ends of the first main branch wiring section and the second main branch wiring section to each other and electrically connecting them to the battery monitoring unit, wherein the first main branch wiring section is bent at a first main branch bending section at the boundary between the one end of the first main branch wiring section and the one end of the connecting wiring section and extends in the arrangement direction, and the second main branch wiring sectionthe first sub-connecting wiring portion is bent at a first sub-branch bending portion at a boundary between the one end of the wiring portion and the other end of the connecting wiring portion and extends in the arrangement direction, the connecting wiring portion having a main connecting wiring portion electrically connected to the battery monitoring unit, a first sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the first main branching wiring portion via the first main branching bending portion, thereby electrically connecting the main connecting wiring portion and the first main branching wiring portion, and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branching wiring portion via the second main branching bending portion, thereby electrically connecting the main connecting wiring portion and the second main branching wiring portion, the first sub-connecting wiring portion is bent at a first sub-branch bending portion at a branched end of the main connecting wiring portion and extends to the one end of the first main branching wiring portion, and the second sub-connecting wiring portion the connecting wiring portion is bent at a second sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, and the case includes: a first accommodating chamber that accommodates the first main branch wiring portion from a first opening; a second accommodating chamber that accommodates the second main branch wiring portion from a second opening; a third accommodating chamber that accommodates the first terminal-to-terminal connecting component from a third opening; a fourth accommodating chamber that accommodates the second terminal-to-terminal connecting component from a fourth opening; a first cover portion that closes the first opening; a second cover portion that closes the second opening; a third cover portion that closes the third opening; a fourth cover portion that closes the fourth opening; a first hinge portion that rotates the third cover portion between an open position and a closed position relative to the third opening; and a second hinge portion that rotates the fourth cover portion between an open position and a closed position relative to the fourth opening. the insulating coating comprises a base film and a coverlay film for each surface that covers the surface of the base film; the first voltage detection wire has a first terminal-side routing portion that is routed on one surface of the base film and electrically connected to the first terminal-to-terminal connecting component, a first mating-side routing portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit, and a first circuit replacement portion that electrically connects the first terminal-side routing portion and the first mating-side routing portion via a through-hole in the base film in the connecting wiring portion; and the second voltage detection wire has a second terminal-side routing portion that is routed on one surface of the base film and electrically connected to the second terminal-to-terminal connecting component, a second mating-side routing portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit, and a second circuit replacement portion that electrically connects the second terminal-side routing portion and the second mating-side routing portion via a through-hole in the base film in the connecting wiring portion. It is characterized by: Furthermore, a conductive module according to the present invention comprises a flexible wiring component, a first terminal-to-terminal connection component, a second terminal-to-terminal connection component, and a case that receives the flexible wiring component, the first terminal-to-terminal connection component, and the second terminal-to-terminal connection component through an opening, wherein the flexible wiring component comprises a wiring main body that is formed flat and flexible and includes an insulating coating that encloses a group of voltage detection wires that electrically connect a battery module in which a plurality of battery cells are arranged in a row to a battery monitoring unit that monitors the battery state of each of the battery cells, and the battery cells each have a flat, uniform surface that is formed on the same flat surface at the cell main body. The battery module has a first electrode terminal group in which one electrode terminal of each of the battery cells is arranged in the arrangement direction of the plurality of battery cells, and a pair of the one electrode terminals adjacent to each other in the arrangement direction are electrically connected by the first inter-terminal connection parts for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminal of each of the battery cells is arranged in the arrangement direction, and a pair of the other electrode terminals adjacent to each other in the arrangement direction are electrically connected by the first inter-terminal connection parts for each of the pair of the other electrode terminals. and a second electrode terminal group electrically connected by the second terminal-to-terminal connection parts, wherein the voltage detection line group comprises a first voltage detection line provided for each of the first terminal-to-terminal connection parts and electrically connecting the first terminal-to-terminal connection parts and the battery monitoring unit, and a second voltage detection line provided for each of the second terminal-to-terminal connection parts and electrically connecting the second terminal-to-terminal connection parts and the battery monitoring unit, and the wiring main body comprises a first main branch wiring section extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the first electrode terminal group; a second main branch wiring section extending in the arrangement direction between a terminal group and the second electrode terminal group and close to the second electrode terminal group; and a connecting wiring section having one end continuing to one end of the first main branch wiring section and the other end continuing to one end of the second main branch wiring section, connecting the one ends of the first main branch wiring section and the second main branch wiring section to each other and electrically connecting them to the battery monitoring unit, wherein the first main branch wiring section is bent at a first main branch bending section at the boundary between the one end of the first main branch wiring section and the one end of the connecting wiring section and extends in the arrangement direction, and the second main branch wiring sectionThe wiring portion is bent at a second main branch bending portion at a boundary between the one end and the other end of the connecting wiring portion and extends in the arrangement direction, and the connecting wiring portion includes a main connecting wiring portion electrically connected to the battery monitoring unit, a first sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the first main branch wiring portion via the first main branch bending portion to electrically connect the main connecting wiring portion and the first main branch wiring portion, and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bending portion. and a second sub-connecting wiring portion that electrically connects the main connecting wiring portion and the second main branch wiring portion by connecting the first sub-connecting wiring portion to the first sub-branch bending portion at which the first sub-connecting wiring portion branches off from the main connecting wiring portion and extends to the one end of the first main branch wiring portion, and the second sub-connecting wiring portion that is bent at a second sub-branch bending portion at which the second sub-connecting wiring portion branches off from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, and the case has a first receiving chamber that receives the first main branch wiring portion from a first opening and a second receiving chamber that receives the second main branch wiring portion from a second opening. a second accommodating chamber for accommodating a terminal-terminal connecting component from a third opening, a third accommodating chamber for accommodating the first terminal-terminal connecting component from a fourth opening, a first cover portion for closing the first opening, a second cover portion for closing the second opening, a third cover portion for closing the third opening, a fourth cover portion for closing the fourth opening, a first hinge portion for rotating the third cover portion between an open position and a closed position relative to the third opening, and a second hinge portion for rotating the fourth cover portion between the open position and the closed position relative to the fourth opening. and a portion, wherein at least one of the first main branch wiring portion and the second main branch wiring portion that is the target of circuit addition has an added circuit wiring portion that protrudes from an end portion on the side of a space surrounded by the first main branch wiring portion, the second main branch wiring portion, and the connecting wiring portion and is folded back 180 degrees from a base portion on this end portion and superimposed on the main branch wiring portion that is the target of circuit addition, and the group of voltage detection lines includes the first voltage detection line or the second voltage detection line in the main branch wiring portion that is the target of circuit addition and passes through the added circuit wiring portion. [Effects of the Invention]

[0009] In the flexible wiring component and conductive module according to the present invention, the wiring main body is bent at a first main branch bending portion between the first main branch wiring portion and the first sub-connecting wiring portion, at a second main branch bending portion between the second main branch wiring portion and the second sub-connecting wiring portion, at a first sub-branch bending portion between the main connecting wiring portion and the first sub-connecting wiring portion, and at a second sub-branch bending portion between the main connecting wiring portion and the second sub-connecting wiring portion. Therefore, regardless of the spacing between the first electrode terminal group and the second electrode terminal group, the wiring main body can be removed from the base material to produce a semi-finished product without leaving a space surrounded by the first main branch wiring portion, the second main branch wiring portion, and the connecting wiring portion. Therefore, the flexible wiring component of this embodiment can improve the yield when multiple wiring main bodies are die-cut from the base material, regardless of the spacing between the first electrode terminal group and the second electrode terminal group. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a flexible wiring component according to an embodiment installed in a battery module. [Figure 2] FIG. 2 is a diagram showing a flexible wiring component according to an embodiment. [Figure 3] FIG. 3 is an explanatory diagram illustrating the laminated structure of the flexible wiring component. [Figure 4] FIG. 4 is a diagram showing a semi-finished product of the flexible wiring component according to the embodiment. [Figure 5] FIG. 5 is a diagram showing a modified example of the flexible wiring component according to the embodiment. [Figure 6] FIG. 6 is a diagram showing a modified example of the flexible wiring component according to the embodiment. [Figure 7] FIG. 7 is a diagram showing a case in which the flexible wiring component of the embodiment is housed. [Figure 8] FIG. 8 is a diagram showing a modified example of a case that accommodates the flexible wiring component of the embodiment. [Figure 9] FIG. 9 is a diagram showing a modified example of the flexible wiring component according to the embodiment. [Figure 10] FIG. 10 is a diagram showing a modified example of the flexible wiring component according to the embodiment. [Figure 11] FIG. 11 is a diagram showing a modified example of the flexible wiring component of the embodiment installed in a battery module, showing the additional circuit wiring portion after being bent. [Figure 12] FIG. 12 is a diagram showing a modified example of the flexible wiring component of the embodiment installed in a battery module, showing the additional circuit wiring portion before being folded. [Figure 13] FIG. 13 is a diagram showing a semi-finished product of a modified flexible wiring component. [Figure 14] FIG. 14 is an explanatory diagram illustrating the layered structure of the bent portion. [Figure 15] FIG. 15 is an explanatory diagram illustrating the layered structure of the bent portion. [Figure 16] FIG. 16 is a diagram showing another modified flexible wiring component. [Figure 17] FIG. 17 is a diagram illustrating the shielding plate. [Figure 18] FIG. 18 is a diagram illustrating the shielding plate. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a flexible wiring component and a conductive module according to the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to these embodiments.

[0012] [Embodiment] One embodiment of a flexible wiring component and a conductive module according to the present invention will be described with reference to FIGS.

[0013] 1 to 15, reference numeral 1 denotes a flexible wiring component of this embodiment. The flexible wiring component 1 is assembled with a battery module BM, which has a plurality of battery cells BC arranged in a row, to form a battery pack BP together with the battery module BM (FIG. 1). The battery pack BP is mounted, for example, on a vehicle (such as an electric vehicle or hybrid vehicle) equipped with a rotating machine as a drive source, and is used to supply power to the rotating machine.

[0014] The battery cell BC comprises a cell body BC1 and positive and negative electrode terminals BC2, with the two electrode terminals BC2 provided one on each side at a distance on the same plane in the cell body BC1 (FIG. 1).

[0015] The battery cell BC shown here has a cell body BC1 formed in a rectangular shape with six outer wall surfaces, and two electrode terminals BC2 are provided on one of the six outer wall surfaces of the cell body BC1. In the battery module BM, the cell bodies BC1 adjacent to each other in the arrangement direction are arranged with one outer wall surface facing each other. Therefore, in the battery cell BC shown here, the two electrode terminals BC2 are provided on one of the four outer wall surfaces of the cell body BC1 that are aligned along the arrangement direction of the battery cells BC. On one outer wall surface of the cell body BC1, the positive electrode terminal BC2 is located at one end in a direction perpendicular to the arrangement direction of the battery cells BC, and the negative electrode terminal BC2 is located at the other end in the perpendicular direction.

[0016] Each electrode terminal BC2 may be, for example, a plate-like or rectangular electrode provided on one of the outer wall surfaces of the cell body BC1, or a columnar pole protruding from one of the outer wall surfaces of the cell body BC1. In the case of a plate-like or rectangular electrode terminal BC2, a first inter-terminal connection part BB1, a second inter-terminal connection part BB2, a total positive electrode connection part BB3, or a total negative electrode connection part BB4, which will be described later, is physically and electrically connected to the electrode terminal BC2 by welding or the like. In the case of an electrode terminal BC2 serving as a pole, the electrode terminal BC2 is provided with a male screw portion, and therefore the electrode terminal BC2 is inserted into a through-hole of a first inter-terminal connection part BB1, a second inter-terminal connection part BB2, a total positive electrode connection part BB3, or a total negative electrode connection part BB4, which will be described later, and a female screw member is screwed into the male screw portion of the electrode terminal BC2, thereby physically and electrically connecting the first inter-terminal connection part BB1, the second inter-terminal connection part BB2, the total positive electrode connection part BB3, or the total negative electrode connection part BB4 to the electrode terminal BC2. Here, a rectangular plate-shaped electrode terminal BC2 is given as an example.

[0017] The battery module BM has a first electrode terminal group BC5 in which one electrode terminal BC2 of each battery cell BC is arranged in the arrangement direction of the multiple battery cells BC, and one electrode terminal BC2 of each pair adjacent in the arrangement direction is electrically connected by a first inter-terminal connection part BB1 for one electrode terminal BC2 of the pair, and a second electrode terminal group BC6 in which the other electrode terminal BC2 of each battery cell BC is arranged in the arrangement direction of the multiple battery cells BC, and one electrode terminal BC2 of each pair adjacent in the arrangement direction is electrically connected by a second inter-terminal connection part BB2 for the other electrode terminal BC2 of the pair (Figure 1).

[0018] In this battery module BM, when the multiple battery cells BC are electrically connected in series, the multiple battery cells BC are arranged so that one electrode terminal BC2 in each of the first electrode terminal groups BC5 is a positive electrode and one electrode terminal BC2 in each of the second electrode terminal groups BC6 is a negative ...

[0019] The first electrode terminal group BC5 includes multiple sets of one electrode terminal BC2 of the pair, as well as one electrode terminal BC2 that is not included in the pair. The second electrode terminal group BC6 includes multiple sets of the other electrode terminal BC2 of the pair, as well as one electrode terminal BC2 that is not included in the pair. In the battery module BM, one of the two electrode terminals BC2 that are not included in the pair serves as a general positive electrode, and the other serves as a general negative electrode. In this battery module BM, a general positive electrode connection part BB3 is electrically connected to the electrode terminal BC2 that serves as the general positive electrode, and a general negative electrode connection part BB4 is electrically connected to the electrode terminal BC2 that serves as the general negative electrode (FIG. 1).

[0020] The first terminal connection part BB1, the second terminal connection part BB2, the total positive electrode connection part BB3, and the total negative electrode connection part BB4 are each a metal plate-shaped conductive part called a bus bar. The first terminal connection part BB1 and the second terminal connection part BB2 shown here are the same conductive part, but for convenience of explanation, they are given different names. Also, the total positive electrode connection part BB3 and the total negative electrode connection part BB4 shown here are the same conductive part, but for convenience of explanation, they are given different names.

[0021] The battery module BM shown here has an exhaust duct BD between the first electrode terminal group BC5 and the second electrode terminal group BC6, which exhausts gas discharged from inside the battery cells BC to the outside (FIG. 1). Here, the exhaust duct BD is provided between and in the center of the first electrode terminal group BC5 and the second electrode terminal group BC6.

[0022] The vehicle is equipped with a battery monitoring unit UM that monitors the battery state of each battery cell BC in the battery module BM (Fig. 1). The flexible wiring component 1 electrically connects the battery module BM and the battery monitoring unit UM.

[0023] The flexible wiring component 1 has a wiring main body 1A that is flexible and flat, and in which a group of voltage detection wires 10 that electrically connect the battery module BM and the battery monitoring unit UM are enclosed in an insulating coating 20 (Figures 1 and 2).

[0024] The voltage detection wire group 10 includes a plurality of flexible voltage detection wires. The voltage detection wire group 10 includes a first voltage detection wire 11 provided for each first terminal-to-terminal connection part BB1 and electrically connecting the first terminal-to-terminal connection part BB1 to the battery monitoring unit UM, and a second voltage detection wire 12 provided for each second terminal-to-terminal connection part BB2 and electrically connecting the second terminal-to-terminal connection part BB2 to the battery monitoring unit UM (FIGS. 1 and 2). The voltage detection wire group 10 shown here also includes a first voltage detection wire 11 electrically connecting the common positive electrode connection part BB3 to the battery monitoring unit UM, and a second voltage detection wire 12 electrically connecting the common negative electrode connection part BB4 to the battery monitoring unit UM. Note that only some of the first voltage detection wires 11 and some of the second voltage detection wires 12 are shown in the figures.

[0025] The flexible wiring component 1 shown here is a flexible printed circuit board (so-called FPC), in which each voltage detection line (first voltage detection line 11, second voltage detection line 12) of the voltage detection line group 10 is formed by a conductor pattern, and the insulating coating 20 is formed of various types of flat, flexible films. The insulating coating 20 includes a base film 21 and a coverlay film 22 for each surface that covers the surface of the base film 21 (FIG. 3). The voltage detection line group 10 is routed on at least one surface of the base film 21 by forming each voltage detection line as a circuit pattern made of a conductor pattern on that surface. For example, if each voltage detection line of the voltage detection line group 10 is formed on only one surface of the base film 21, the flexible wiring component 1 is configured as a single-sided flexible printed circuit board having one conductor pattern layer. On the other hand, if each voltage detection line of the voltage detection line group 10 is formed on both surfaces of the base film 21, the flexible wiring component 1 is configured as a double-sided flexible printed circuit board having two conductor pattern layers.

[0026] Specifically, the wiring main body 1A has a first main branch wiring portion 1a that extends in the arrangement direction of the multiple battery cells BC between the first electrode terminal group BC5 and the second electrode terminal group BC6, close to the first electrode terminal group BC5, and a second main branch wiring portion 1b that extends in the arrangement direction of the multiple battery cells BC between the first electrode terminal group BC5 and the second electrode terminal group BC6, close to the second electrode terminal group BC6 (Figures 1 and 2).

[0027] The first main branch wiring portion 1a includes a first main branch covering portion 20a of the insulating covering 20 and first main branch conductive portions 11a of all the first voltage detection lines 11 (FIGS. 1 and 2). The first main branch covering portion 20a is a portion of the insulating covering 20 that extends in the arrangement direction of the plurality of battery cells BC between the first electrode terminal group BC5 and the second electrode terminal group BC6, close to the first electrode terminal group BC5, and is formed by a corresponding portion of the base film 21 and the coverlay film 22. The first main branch conductive portion 11a is a portion of the first voltage detection line 11 that extends in the arrangement direction of the plurality of battery cells BC between the first electrode terminal group BC5 and the second electrode terminal group BC6 and is included in the first main branch covering portion 20a, and is formed in a corresponding portion of the surface of the base film 21 in the first main branch covering portion 20a.

[0028] For example, the flexible wiring component 1 includes an electrical connection part (not shown) such as an electric wire for each first terminal connection part BB1 that electrically connects the first main branch conductive portion 11a to the first terminal connection part BB1. Furthermore, the flexible wiring component 1 includes an electrical connection part (not shown) such as an electric wire that electrically connects the first main branch conductive portion 11a for the general positive terminal connection part BB3 to the general positive terminal connection part BB3.

[0029] The second main branch wiring portion 1b includes a second main branch covering portion 20b of the insulating covering 20 and second main branch conductive portions 12a of all the second voltage detection lines 12 (FIGS. 1 and 2). The second main branch covering portion 20b is a portion of the insulating covering 20 that extends in the arrangement direction of the plurality of battery cells BC between the first electrode terminal group BC5 and the second electrode terminal group BC6, close to the second electrode terminal group BC6, and is formed by a corresponding portion of the base film 21 and the coverlay film 22. The second main branch conductive portion 12a is a portion of the second voltage detection line 12 that extends in the arrangement direction of the plurality of battery cells BC between the first electrode terminal group BC5 and the second electrode terminal group BC6 and is included in the second main branch covering portion 20b, and is formed in a corresponding portion of the surface of the base film 21 in the second main branch covering portion 20b.

[0030] For example, the flexible wiring component 1 includes an electrical connection part (not shown) such as an electric wire for each second terminal connection part BB2 that electrically connects the second main branch conductive part 12a to the second terminal connection part BB2. Furthermore, the flexible wiring component 1 includes an electrical connection part (not shown) such as an electric wire that electrically connects the second main branch conductive part 12a for the general negative terminal connection part BB4 to the general negative terminal connection part BB4.

[0031] Furthermore, the wiring main body 1A has a connecting wiring portion 1c that connects one end 1a1, 1b1 of the first main branch wiring portion 1a and one end 1b1 of the second main branch wiring portion 1b together and electrically connects to the battery monitoring unit UM (FIGS. 1 and 2). This connecting wiring portion 1c has one end 1c1 that continues to the one end 1a1 of the first main branch wiring portion 1a and the other end 1c2 that continues to the one end 1b1 of the second main branch wiring portion 1b. This connecting wiring portion 1c is provided with a connector 50 that is fitted and connected to a connector (not shown) on the battery monitoring unit UM side (FIG. 1).

[0032] The connecting wiring portion 1c includes a connecting coating portion 20c of the insulating coating 20, first unit side connecting portions 11b of all the first voltage detection wires 11, and second unit side connecting portions 12b of all the second voltage detection wires 12 (FIGS. 1 and 2). The connecting coating portion 20c is a portion where one end of the first main branch coating portion 20a and one end of the second main branch coating portion 20b are connected to each other by the insulating coating 20, and is formed by a corresponding portion of the base film 21 and the coverlay film 22. The first unit side connecting portion 11b is a portion where one end of the first main branch conductive portion 11a is bent toward the connecting coating portion 20c, and is enclosed in the connecting coating portion 20c at its tip, and its further tip is electrically connected to the battery monitoring unit UM, and is formed in a corresponding portion of the connecting coating portion 20c on the surface of the base film 21. The second unit side connection portion 12b is a portion that is bent from one end of the second main branch conductive portion 12a toward the connecting covering portion 20c, and is enclosed in the connecting covering portion 20c at its tip, and its further end is electrically connected to the battery monitoring unit UM, and is formed at the corresponding portion on the surface of the base film 21 in the connecting covering portion 20c.

[0033] In this wiring main body 1A, the first main branch wiring portion 1a is formed by bending it from the connecting wiring portion 1c side, and the second main branch wiring portion 1b is formed by bending it from the connecting wiring portion 1c side. The first main branch wiring portion 1a is bent at a first main branch bend portion 1d at the boundary between one end portion 1a1 of the first main branch wiring portion 1a and one end portion 1c1 of the connecting wiring portion 1c, and extends in the arrangement direction of the plurality of battery cells BC (FIGS. 1 and 2). The second main branch wiring portion 1b is bent at a second main branch bend portion 1e at the boundary between one end portion 1b1 of the first main branch wiring portion 1a and the other end portion 1c2 of the connecting wiring portion 1c, and extends in the arrangement direction of the plurality of battery cells BC (FIGS. 1 and 2).

[0034] Furthermore, the connecting wiring portion 1c of this wiring main body 1A has a main connecting wiring portion 1f that is electrically connected to the battery monitoring unit UM, a first sub-connecting wiring portion 1g that branches off from this main connecting wiring portion 1f and is connected to one end 1a1 of the first main branch wiring portion 1a via a first main branch bend portion 1d, thereby electrically connecting the main connecting wiring portion 1f and the first main branch wiring portion 1a, and a second sub-connecting wiring portion 1h that branches off from the main connecting wiring portion 1f and is connected to one end 1b1 of the second main branch wiring portion 1b via a second main branch bend portion 1e, thereby electrically connecting the main connecting wiring portion 1f and the second main branch wiring portion 1b (Figures 1 and 2). The first sub-connecting wiring portion 1g is bent at a first sub-branch bending portion 1i branched from the main connecting wiring portion 1f to extend to one end 1a1 of the first main branch wiring portion 1a and is connected to the one end 1a1 via a first main branch bending portion 1d (FIGS. 1 and 2). The second sub-connecting wiring portion 1h is bent at a second sub-branch bending portion 1j branched from the main connecting wiring portion 1f to extend to one end 1b1 of the second main branch wiring portion 1b and is connected to the one end 1b1 via a second main branch bending portion 1e (FIGS. 1 and 2).

[0035] This wiring main body 1A is one of several rectangular pieces cut out from a single sheet-like base material (a laminate of a first film that serves as the base film 21, a first voltage detection wire 11 and a second voltage detection wire 12 for each flexible wiring component 1 arranged on the surface of the first film, and a second film that serves as the coverlay film 22 that covers each surface of the first film), and is shaped by bending the rectangular semi-finished product 1X (Figure 4).

[0036] The semi-finished product 1X has a slit 1x that separates the first main branch wiring portion 1a side and the first sub-connecting wiring portion 1g side from the second main branch wiring portion 1b side and the second sub-connecting wiring portion 1h side and the main connecting wiring portion 1f side (FIG. 4). The slit 1x may be formed when the semi-finished product 1X is stamped out from the base material, or may be formed by making an incision after the semi-finished product 1X is stamped out from the base material. Alternatively, the slit 1x may be formed to partially connect the first main branch wiring portion 1a side and the first sub-connecting wiring portion 1g side with the second main branch wiring portion 1b side and the second sub-connecting wiring portion 1h side when the semi-finished product 1X is stamped out from the base material, and the connecting portion may be cut after the semi-finished product 1X is stamped out from the base material.

[0037] In the semi-finished product 1X of this wiring main body 1A, first main branch wiring portion 1a and first sub-connecting wiring portion 1g, which protrude in a straight line from main connecting wiring portion 1f, are bent by 90 degrees at first sub-branch bending portion 1i so as to be perpendicular to the protruding direction, and second main branch wiring portion 1b and second sub-connecting wiring portion 1h, which protrude in a straight line from main connecting wiring portion 1f, are bent by 90 degrees at second sub-branch bending portion 1j so as to be perpendicular to the protruding direction. In this wiring main body 1A, the first main branch wiring portion 1a and first sub-connecting wiring portion 1g, and the second main branch wiring portion 1b and second sub-connecting wiring portion 1h are bent so as to face in opposite directions.

[0038] Furthermore, in the semi-finished product 1X, this wiring main body 1A is bent at a first main branch bending portion 1d by 90 degrees so that the first main branch wiring portion 1a and the first sub-connecting wiring portion 1g are orthogonal to each other, and is bent at a second main branch bending portion 1e by 90 degrees so that the second main branch wiring portion 1b and the second sub-connecting wiring portion 1h are orthogonal to each other. In this wiring main body 1A, the first main branch wiring portion 1a and the second main branch wiring portion 1b are bent so that they face in the same direction relative to the first sub-connecting wiring portion 1g and the second sub-connecting wiring portion 1h, respectively.

[0039] In other words, this wiring main body 1A is formed by bending a first sub-connecting wiring portion 1g protruding from a main connecting wiring portion 1f by 90 degrees relative to its protruding direction at a first sub-branch bending portion 1i, bending a first main branching wiring portion 1a by 90 degrees relative to the first sub-connecting wiring portion 1g at a first main branch bending portion 1d, bending a second sub-connecting wiring portion 1h protruding from the main connecting wiring portion 1f by 90 degrees relative to its protruding direction in the opposite direction to the first sub-connecting wiring portion 1g at a second sub-branch bending portion 1j, and bending a second main branching wiring portion 1b by 90 degrees relative to the second sub-connecting wiring portion 1h in the same direction as the first main branching wiring portion 1a at a second main branch bending portion 1e.

[0040] This wiring main body 1A is formed by bending the semi-finished product 1X at folds 1dx, 1ex, 1ix, and 1jx to form the first main branch bend 1d, the second main branch bend 1e, the first sub-branch bend 1i, and the second sub-branch bend 1j (FIG. 4 → FIG. 2). Note that the folds 1dx, 1ex, 1ix, and 1jx may be provided on the semi-finished product 1X as visible markers, or may not be provided on the semi-finished product 1X as markers.

[0041] In this manner, the wiring main body 1A is bent at the first main branch bending portion 1d between the first main branch wiring portion 1a and the first sub-connecting wiring portion 1g, at the second main branch bending portion 1e between the second main branch wiring portion 1b and the second sub-connecting wiring portion 1h, at the first sub-branch bending portion 1i between the main connecting wiring portion 1f and the first sub-connecting wiring portion 1g, and at the second sub-branch bending portion 1j between the main connecting wiring portion 1f and the second sub-connecting wiring portion 1h. Therefore, regardless of the size of the gap between the first electrode terminal group BC5 and the second electrode terminal group BC6, the semi-finished product 1X can be extracted from the base material without leaving a space surrounded by the first main branch wiring portion 1a, the second main branch wiring portion 1b, and the connecting wiring portion 1c. Therefore, the flexible wiring component 1 of this embodiment can improve the yield when multiple wiring main bodies 1A are die-cut out from the base material, regardless of the size of the gap between the first electrode terminal group BC5 and the second electrode terminal group BC6.

[0042] In the flexible wiring component 1 of this embodiment, the wiring main body 1A may be replaced with wiring main bodies 1B and 1C as follows (FIGS. 5 and 6).

[0043] The wiring main body 1B is formed from a semi-finished product (not shown) in which the first main branch wiring portion 1a side and the first sub-connecting wiring portion 1g side are extended beyond the second main branch wiring portion 1b side and the second sub-connecting wiring portion 1h side, compared to the semi-finished wiring main body 1A 1X. This wiring main body 1B has the main connecting wiring portion 1f positioned closer to the second main branch wiring portion 1b side than the wiring main body 1A, which has the main connecting wiring portion 1f positioned approximately in the center between the first main branch wiring portion 1a side and the second main branch wiring portion 1b side (FIG. 5). That is, this wiring main body 1B is used when it is necessary to offset the connector 50 toward the second main branch wiring portion 1b side.

[0044] The wiring main body 1C is formed from a semi-finished product (not shown) in which the second main branch wiring portion 1b side and the second sub-connecting wiring portion 1h side are extended further than the first main branch wiring portion 1a side and the first sub-connecting wiring portion 1g side with respect to the semi-finished wiring main body 1X of the wiring main body 1A. In this wiring main body 1C, the main connecting wiring portion 1f is positioned closer to the first main branch wiring portion 1a side compared to the wiring main body 1A in which the main connecting wiring portion 1f is positioned approximately in the center between the first main branch wiring portion 1a side and the second main branch wiring portion 1b side (FIG. 6). In other words, this wiring main body 1C is used when it is necessary to offset the connector 50 toward the first main branch wiring portion 1a side.

[0045] Like the wiring main body 1A, the wiring main bodies 1B and 1C are bent at a first main branch bend 1d between the first main branch wiring portion 1a and the first sub-connecting wiring portion 1g, at a second main branch bend 1e between the second main branch wiring portion 1b and the second sub-connecting wiring portion 1h, at a first sub-branch bend 1i between the main connecting wiring portion 1f and the first sub-connecting wiring portion 1g, and at a second sub-branch bend 1j between the main connecting wiring portion 1f and the second sub-connecting wiring portion 1h. Therefore, like the wiring main body 1A, the wiring main bodies 1B and 1C allow a semi-finished product to be removed from the base material without leaving a space surrounded by the first main branch wiring portion 1a, the second main branch wiring portion 1b, and the connecting wiring portion 1c, regardless of the size of the gap between the first electrode terminal group BC5 and the second electrode terminal group BC6. Therefore, the flexible wiring component 1 of this embodiment can improve the yield when multiple wiring main bodies 1B or 1C are die-cut out from the base material, regardless of the size of the gap between the first electrode terminal group BC5 and the second electrode terminal group BC6.

[0046] In the wiring main bodies 1A, 1B, and 1C described above, other components can be placed in the space surrounded by the first main branch wiring portion 1a, the second main branch wiring portion 1b, and the connecting wiring portion 1c. Furthermore, in these wiring main bodies 1A, 1B, and 1C, the first main branch wiring portion 1a, the second main branch wiring portion 1b, and the connecting wiring portion 1c can be placed to avoid the exhaust duct BD between the first electrode terminal group BC5 and the second electrode terminal group BC6, so that they can be protected from the high-temperature, high-pressure gas discharged from the exhaust duct BD.

[0047] The flexible wiring component 1 of this embodiment is housed in a case 60 together with a first terminal-to-terminal connection component BB1, a second terminal-to-terminal connection component BB2, a positive terminal connection component BB3, and a negative terminal connection component BB4. Here, the flexible wiring component 1, the first terminal-to-terminal connection component BB1, the second terminal-to-terminal connection component BB2, the positive terminal connection component BB3, the negative terminal connection component BB4, and the case 60 are included, and the flexible wiring component 1, the first terminal-to-terminal connection component BB1, the second terminal-to-terminal connection component BB2, the positive terminal connection component BB3, and the negative terminal connection component BB4 housed in the case 60 are referred to as a conductive module 70 ( FIGS. 7 and 8 ). The conductive module 70 can similarly obtain the effects achieved by the flexible wiring component 1.

[0048] In this conductive module 70, the case 60 has a first accommodating chamber 61 that accommodates the first main branch wiring portion 1a through a first opening 61a, a second accommodating chamber 62 that accommodates the second main branch wiring portion 1b through a second opening 62a, a third accommodating chamber 63 that accommodates the first inter-terminal connecting part BB1 and the total positive electrode connecting part BB3 through a third opening 63a, a fourth accommodating chamber 64 that accommodates the second inter-terminal connecting part BB2 and the total negative electrode connecting part BB4 through a fourth opening 64a, and a second accommodating chamber 65 that accommodates the first inter-terminal connecting part BB1 and the total negative electrode connecting part BB4 through a fourth opening 64a. The case 60 has a first cover part 65 that closes the opening 61a, a second cover part 66 that closes the second opening 62a, a third cover part 67 that closes the third opening 63a, a fourth cover part 68 that closes the fourth opening 64a, a first hinge part 69a that rotates the third cover part 67 between an open position and a closed position with respect to the third opening 63a, and a second hinge part 69b that rotates the fourth cover part 68 between the open position and the closed position with respect to the fourth opening 64a (FIGS. 7 and 8). The case 60 is molded from an insulating material such as synthetic resin.

[0049] 7 includes a housing member 60A having a first housing chamber 61, a second housing chamber 62, a third housing chamber 63, and a fourth housing chamber 64, and a cover member 60B having a first cover portion 65, a second cover portion 66, a third cover portion 67, and a fourth cover portion 68, and the housing member 60A and the cover member 60B are assembled together. In the case 60, a first hinge portion 69a and a second hinge portion 69b are provided on the cover member 60B. In the cover member 60B, a first hinge portion 69a is provided between the first cover portion 65 and the third cover portion 67. By rotating the third cover portion 67 relative to the first cover portion 65 about the axis of the first hinge portion 69a, the third cover portion 67 is rotated between an open position and a closed position relative to the third opening 63a. Furthermore, in this cover member 60B, a second hinge portion 69b is provided between the second cover portion 66 and the fourth cover portion 68, and by rotating the fourth cover portion 68 about the axis of the second hinge portion 69b relative to this second cover portion 66, the fourth cover portion 68 is rotated between an open position and a closed position relative to the fourth opening 64a. Therefore, the number of parts of this case 60 can be reduced. Furthermore, in this case 60, the third cover portion 67 and the fourth cover portion 68 can be retracted to the open position, which improves the ease of laser welding (or the ease of screw fastening) between the first terminal-to-terminal connection part BB1, the second terminal-to-terminal connection part BB2, etc., and the electrode terminal BC2.

[0050] 8 includes a housing member 60C having a first housing chamber 61, a second housing chamber 62, a third housing chamber 63, a fourth housing chamber 64, a third cover portion 67, and a fourth cover portion 68, and a cover member 60D having a first cover portion 65 and a second cover portion 66, and the housing member 60C and the cover member 60D are assembled together. In the case 60, a first hinge portion 69a and a second hinge portion 69b are provided on the housing member 60C. In the housing member 60C, a first hinge portion 69a is provided between the outer wall of the third housing chamber 63 and the third cover portion 67, and by rotating the third cover portion 67 around the axis of the first hinge portion 69a relative to the third housing chamber 63, the third cover portion 67 is rotated between an open position and a closed position relative to the third opening 63a. Furthermore, in this cover member 60B, a second hinge portion 69b is provided between the outer wall of the fourth housing chamber 64 and the fourth cover portion 68. By rotating the fourth cover portion 68 about the axis of the second hinge portion 69b relative to the fourth housing chamber 64, the fourth cover portion 68 is rotated between an open position and a closed position relative to the fourth opening 64a. Therefore, the number of parts of this case 60 can be reduced. Furthermore, in this case 60, the third cover portion 67 and the fourth cover portion 68 can be retracted to the open position, which improves the ease of laser welding (or the ease of screw fastening) between the first terminal-to-terminal connection part BB1, the second terminal-to-terminal connection part BB2, etc., and the electrode terminal BC2.

[0051] Here, the area in which a circuit pattern can be formed can be increased by configuring this flexible wiring component 1 as a double-sided flexible printed circuit board rather than as a single-sided flexible printed circuit board as described above. When configured as a double-sided flexible printed circuit board, the first voltage detection line 11 and the second voltage detection line are each provided with a circuit switching portion (a first circuit switching portion 11z and a second circuit switching portion 12z described below) that electrically connects the portion routed on one surface of the base film 21 with the portion routed on the other surface of the base film 21 (FIG. 9). The circuit switching portion is preferably provided in the connecting wiring portion 1c, more specifically, in a flat portion of the connecting wiring portion 1c excluding the first sub-branch bend portion 1i and the second sub-branch bend portion 1j.

[0052] Specifically, the first voltage detection wire 11 includes a first terminal-side routing portion 11x routed on one surface of the base film 21 and electrically connected to the first terminal-to-terminal connecting component BB1 (general positive-electrode connecting component BB3), a first mating-side routing portion 11y routed on the other surface of the base film 21 and electrically connected to the battery monitoring unit UM, and a first circuit replacement portion 11z electrically connecting the first terminal-side routing portion 11x and the first mating-side routing portion 11y via a through-hole 21a in the base film 21 in the connecting wiring portion 1c (FIG. 9). The first circuit replacement portion 11z is provided midway through the first unit-side connecting portion 11b. The first circuit replacement portion 11z is a plated portion formed by electrolytic plating or the like on the peripheral wall of the through-hole 21a and is physically and electrically connected to the first terminal-side routing portion 11x and the first mating-side routing portion 11y.

[0053] The second voltage detection wire 12 includes a second terminal-side routing portion 12x routed on one surface of the base film 21 and electrically connected to the second terminal-to-terminal connecting part BB2 (general negative-electrode connecting part BB4), a second mating-side routing portion 12y routed on the other surface of the base film 21 and electrically connected to the battery monitoring unit UM, and a second circuit replacement portion 12z electrically connecting the second terminal-side routing portion 12x to the second mating-side routing portion 12y via a through-hole 21b in the base film 21 in the connecting wiring portion 1c (FIG. 9). The second circuit replacement portion 12z is provided midway along the second unit-side connecting portion 12b. The second circuit replacement portion 12z is a plated portion formed by electroplating or the like on the peripheral wall of the through-hole 21b and is physically and electrically connected to the second terminal-side routing portion 12x and the second mating-side routing portion 12y.

[0054] In this flexible wiring component 1, the housing member 60A (60C) of the case 60 extends from the top surface to the side surface of the battery module BM, and the connecting wiring portion 1c is fixed to the side surface portion 60a of the housing member 60A (60C) ( FIG. 10 ). For example, the connecting wiring portion 1c may be fixed to the side surface portion 60a with an adhesive or by being sandwiched between the side surface portion 60a and a pressing member (not shown). In this way, this flexible wiring component 1 has the first circuit interchange portion 11z and the second circuit interchange portion 12z, which have low flexibility, provided in the connecting wiring portion 1c (the flat portion of the connecting wiring portion 1c excluding the first sub-branch bend portion 1i and the second sub-branch bend portion 1j), and the connecting wiring portion 1c is fixed to the side surface portion 60a of the housing member 60A (60C), thereby preventing breakage of the first voltage detection line 11 and the second voltage detection line 12.

[0055] Furthermore, the flexible wiring component 1 may be configured as follows to increase the area in which a circuit pattern can be formed.

[0056] In this case, at least one of the first main branch wiring section 1a and the second main branch wiring section 1b, which is the target of circuit addition, has an additional circuit wiring section 1k that protrudes from an end portion on the side of the space surrounded by the first main branch wiring section 1a, the second main branch wiring section 1b, and the connecting wiring section 1c, and is folded back 180 degrees from a base portion 1k1 on this end portion and overlapped on the main branch wiring section which is the target of circuit addition (FIGS. 11 and 12).The voltage detection line group 10 includes a first voltage detection line 11 or a second voltage detection line 12 in the main branch wiring section which is the target of circuit addition and passes through the additional circuit wiring section 1k.Here, the additional circuit wiring section 1k is provided in the first main branch wiring section 1a, and the first voltage detection line 11 that passes through this additional circuit wiring section 1k is provided in the voltage detection line group 10.

[0057] Even if the additional circuit wiring section 1k of this flexible wiring component 1 is disposed opposite the exhaust duct BD when assembled to the battery module BM (FIG. 12), this additional circuit wiring section 1k is folded back 180 degrees and placed on top of the main branch wiring section to which the circuit is to be added (FIG. 11), so that the high-temperature, high-pressure gas discharged from the exhaust duct BD does not directly hit the additional circuit wiring section 1k. Thus, this flexible wiring component 1 can protect from the high-temperature, high-pressure gas discharged from the exhaust duct BD.

[0058] In this case, the wiring main body 1A is formed by bending the semi-finished product 1X shown in FIG. 13. This semi-finished product 1X is divided into a first main branch wiring portion 1a side and a first sub-connecting wiring portion 1g side, a second main branch wiring portion 1b side and a second sub-connecting wiring portion 1h side, and a main connecting wiring portion 1f side, and has slits 1x spaced apart between the first main branch wiring portion 1a side and the first sub-connecting wiring portion 1g side and the second main branch wiring portion 1b side and the second sub-connecting wiring portion 1h side. The additional circuit wiring portion 1k is provided in the slits 1x. The slits 1x are formed together with the additional circuit wiring portion 1k when the semi-finished product 1X is die-cut out from the base material.

[0059] In this wiring main body 1A, as in the previous example, first sub-connecting wiring portion 1g protruding from main connecting wiring portion 1f is bent 90 degrees at first sub-branch bending portion 1i relative to the protruding direction, first main branching wiring portion 1a is bent 90 degrees at first main branch bending portion 1d relative to first sub-connecting wiring portion 1g, second sub-connecting wiring portion 1h protruding from main connecting wiring portion 1f is bent 90 degrees at second sub-branch bending portion 1j in the opposite direction to first sub-connecting wiring portion 1g, and second main branching wiring portion 1b is bent 90 degrees at second main branch bending portion 1e relative to second sub-connecting wiring portion 1h in the same direction as first main branching wiring portion 1a. This wiring main body 1A further has additional circuit wiring portion 1k bent relative to first main branching wiring portion 1a.

[0060] In order to make it easier to bend the root portion 1k1 of the additional circuit wiring portion 1k and to make it easier to create a bend in the root portion 1k1, the flexible wiring component 1 is desirably configured as follows: Therefore, the flexible wiring component 1 is provided with a cutout portion 22a in which at least one of a portion on one coverlay film 22 that is on the outside of the bend in the root portion 1k1 of the additional circuit wiring portion 1k and a portion on the other coverlay film 22 that is on the inside of the bend in the root portion 1k1 of the additional circuit wiring portion 1k is cut out (FIGS. 14 and 15).

[0061] For example, the voltage detection line group 10 (first voltage detection line 11, second voltage detection line 12) is routed at least on one of the two surfaces of the base film 21, the surface that is on the inside of the bend at the root portion 1k1 of the additional circuit wiring section 1k. In this case, it is desirable to provide the cutout portion 22a in a portion of one coverlay film 22 that is on the outside of the bend at the root portion 1k1 of the additional circuit wiring section 1k so as not to expose the voltage detection line group 10 at the root portion 1k1 of the additional circuit wiring section 1k (FIG. 14). For this reason, in the additional circuit wiring section 1k, the voltage detection line group 10 (first voltage detection line 11, second voltage detection line 12) is routed on the surface of the base film 21 that is on the inside of the bend.

[0062] Furthermore, by folding back the additional circuit wiring portion 1k at the root portion 1k1, it becomes difficult to contact the voltage detection line group 10 (the first voltage detection line 11 and the second voltage detection line 12) on the inside of the bend. Therefore, the cutout portion 22a may be provided in a portion of the additional circuit wiring portion 1k on the other coverlay film 22 that is on the inside of the bend at the root portion 1k1 (FIG. 15). Furthermore, the cutout portion 22a may be provided in a portion of the additional circuit wiring portion 1k on one coverlay film 22 that is on the outside of the bend at the root portion 1k1, and in a portion of the additional circuit wiring portion 1k on the other coverlay film 22 that is on the inside of the bend at the root portion 1k1.

[0063] Furthermore, the flexible wiring component 1 having this additional circuit wiring portion 1k may be formed so that it does not have the first main branch bending portion 1d, the second main branch bending portion 1e, the first sub-branch bending portion 1i, and the second sub-branch bending portion 1j, and is bent only at the root portion 1k1 of the additional circuit wiring portion 1k (Figure 16).

[0064] Furthermore, the flexible wiring component 1 shown here employs a configuration in which the connecting wiring portion 1c is branched into the first main branch wiring portion 1a and the second main branch wiring portion 1b to avoid the exhaust duct BD. However, the flexible wiring component 501 shown in FIGS. 17 and 18 does not employ such a branching configuration, and the wiring main body 501A is formed in a rectangular, flat plate shape. Even if the wiring main body 501A is disposed above the exhaust duct BD, facing the exhaust duct BD, by disposing a shielding plate 510 between the wiring main body 501A and the exhaust duct BD, the high-temperature, high-pressure gas discharged from the exhaust duct BD can be prevented from directly hitting the wiring main body 501A. Therefore, the flexible wiring component 501 protects the wiring main body 501A from the high-temperature, high-pressure gas discharged from the exhaust duct BD and can improve the yield when multiple wiring main bodies 501A are die-cut out of a base material. [Explanation of symbols]

[0065] 1 Flexible wiring parts 1A, 1B, 1C Mainly wiring 1a First main branch wiring section 1a1 one end 1b Second main branch wiring section 1b1 one end 1c Connection wiring section 1c1 one end 1c2 other end 1d First main branch bend 1e Second main branch bend 1f Main connection wiring section 1g 1st sub connection wiring section 1h 2nd sub connection wiring section 1i First sub-branch bend 1j Second sub-branch bend 1k increase circuit wiring section 1k1 base part 10 Voltage detection wires 11 First voltage detection wire 11x 1st terminal side wiring section 11y 1st mating side wiring part 11z 1st Circuit Switching Section 12 Second voltage detection wire 12x 2nd terminal side wiring section 12y Second mating side wiring part 12z 2nd circuit interchange section 20 Insulation coating 21 Base film 21a, 21b through holes 22 Coverlay film 22a Excision part 60 cases 61 Containment Cell 1 61a 1st opening 62 Second Containment Cell 62a Second opening 63 Containment Cell 3 63a 3rd opening 64 Containment Cell 4 64a 4th opening 65 First cover part 66 Second cover part 67 Third cover part 68 4th cover part 69a First hinge part 69b Second hinge part 70 Conductive Module BB1 First terminal connection part BB2 Second terminal connection part BC battery cell BC1 Cell Body BC2 electrode terminal BC5 1st electrode terminal group BC6 2nd electrode terminal group BM battery module UM Battery Monitoring Unit

Claims

1. a battery module including a plurality of battery cells arranged in a row and a battery monitoring unit that monitors the battery state of each of the battery cells; and a wiring main body that is flexible and flat, and in which a group of voltage detection wires is enclosed in an insulating coating. The battery cell has positive and negative electrode terminals provided on the same plane in a cell body with a gap between them, the battery module includes a first electrode terminal group in which one electrode terminal of each of the plurality of battery cells is arranged in an arrangement direction of the battery cells, and a pair of the one electrode terminals adjacent to each other in the arrangement direction are electrically connected by a first terminal-to-terminal connection part for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminal of each of the battery cells is arranged in the arrangement direction, and a pair of the other electrode terminals adjacent to each other in the arrangement direction are electrically connected by a second terminal-to-terminal connection part for each of the pair of the other electrode terminals, the voltage detection line group includes: a first voltage detection line provided for each of the first terminal-to-terminal connection components, electrically connecting the first terminal-to-terminal connection component and the battery monitoring unit; and a second voltage detection line provided for each of the second terminal-to-terminal connection components, electrically connecting the second terminal-to-terminal connection component and the battery monitoring unit, the wiring main body includes a first main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the first electrode terminal group, a second main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the second electrode terminal group, and a connecting wiring portion having one end portion connected to one end portion of the first main branch wiring portion and the other end portion connected to one end portion of the second main branch wiring portion, connecting the one ends of the first main branch wiring portion and the second main branch wiring portion to each other and electrically connecting them to the battery monitoring unit, the first main branch wiring portion is bent at a first main branch bending portion at a boundary between the one end portion of the first main branch wiring portion and the one end portion of the connecting wiring portion and extends in the arrangement direction; the second main branch wiring portion is bent at a second main branch bending portion at a boundary between the one end portion of the second main branch wiring portion and the other end portion of the connecting wiring portion and extends in the arrangement direction; the connecting wiring portion includes a main connecting wiring portion electrically connected to the battery monitoring unit, a first sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the first main branch wiring portion via the first main branch bend portion, thereby electrically connecting the main connecting wiring portion and the first main branch wiring portion, and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bend portion, thereby electrically connecting the main connecting wiring portion and the second main branch wiring portion, the first sub-connecting wiring portion is bent at a first sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the first main branch wiring portion; the second sub-connecting wiring portion is bent at a second sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, The insulating coating includes a base film and a coverlay film for each surface that covers a surface of the base film, the first voltage detection line has a first terminal-side routing portion that is routed on one surface of the base film and electrically connected to the first terminal-to-terminal connecting component, a first mating-side routing portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit, and a first circuit interchange portion that electrically connects the first terminal-side routing portion and the first mating-side routing portion via a through-hole in the base film in the connecting wiring portion, a second terminal side wiring portion that is routed on one surface of the base film and electrically connected to the second terminal connection component; a second mating side wiring portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit; and a second circuit replacement portion that electrically connects the second terminal side wiring portion and the second mating side wiring portion via a through hole in the base film in the connecting wiring portion.

2. A battery module in which a plurality of battery cells are arranged in a row is electrically connected to a battery monitoring unit that monitors the battery status of each of the battery cells, and a group of voltage detection wires are enclosed in an insulating coating, the wiring main body being formed flat and flexible; The battery cell has positive and negative electrode terminals provided on the same plane in a cell body with a gap between them, the battery module includes a first electrode terminal group in which one electrode terminal of each of the plurality of battery cells is arranged in an arrangement direction of the battery cells, and a pair of the one electrode terminals adjacent to each other in the arrangement direction are electrically connected by a first terminal-to-terminal connection part for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminal of each of the battery cells is arranged in the arrangement direction, and a pair of the other electrode terminals adjacent to each other in the arrangement direction are electrically connected by a second terminal-to-terminal connection part for each of the pair of the other electrode terminals, the voltage detection line group includes: a first voltage detection line provided for each of the first terminal-to-terminal connection components, electrically connecting the first terminal-to-terminal connection component and the battery monitoring unit; and a second voltage detection line provided for each of the second terminal-to-terminal connection components, electrically connecting the second terminal-to-terminal connection component and the battery monitoring unit, the wiring main body includes a first main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the first electrode terminal group, a second main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the second electrode terminal group, and a connecting wiring portion having one end portion connected to one end portion of the first main branch wiring portion and the other end portion connected to one end portion of the second main branch wiring portion, connecting the one ends of the first main branch wiring portion and the second main branch wiring portion to each other and electrically connecting them to the battery monitoring unit, the first main branch wiring portion is bent at a first main branch bending portion at a boundary between the one end portion of the first main branch wiring portion and the one end portion of the connecting wiring portion and extends in the arrangement direction; the second main branch wiring portion is bent at a second main branch bending portion at a boundary between the one end portion of the second main branch wiring portion and the other end portion of the connecting wiring portion and extends in the arrangement direction; the connecting wiring portion includes a main connecting wiring portion electrically connected to the battery monitoring unit, a first sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the first main branch wiring portion via the first main branch bend portion, thereby electrically connecting the main connecting wiring portion and the first main branch wiring portion, and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bend portion, thereby electrically connecting the main connecting wiring portion and the second main branch wiring portion, the first sub-connecting wiring portion is bent at a first sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the first main branch wiring portion; the second sub-connecting wiring portion is bent at a second sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, At least one of the first main branch wiring section and the second main branch wiring section, which is a circuit expansion target, has an expansion circuit wiring section that protrudes from an end portion on the side of a space surrounded by the first main branch wiring section, the second main branch wiring section, and the connecting wiring section, and is folded back 180 degrees from a base portion on this end portion and overlapped on the main branch wiring section which is a circuit expansion target, A flexible wiring component characterized in that the group of voltage detection lines includes the first voltage detection line or the second voltage detection line in the main branch wiring section of the circuit addition target that passes through the additional circuit wiring section.

3. The flexible wiring component according to claim 1 or 2, wherein the wiring main body is formed by bending the first sub-connecting wiring portion protruding from the main connecting wiring portion by 90 degrees at the first sub-branch bending portion relative to the protruding direction, bending the first main branch wiring portion by 90 degrees at the first main branch bending portion relative to the first sub-connecting wiring portion, bending the second sub-connecting wiring portion protruding from the main connecting wiring portion by 90 degrees at the second sub-branch bending portion in the opposite direction to the first sub-connecting wiring portion relative to the protruding direction, and bending the second main branch wiring portion by 90 degrees at the second main branch bending portion relative to the second sub-connecting wiring portion in the same direction as the first main branch wiring portion.

4. A flexible wiring component; a first terminal-to-terminal connection component; a second terminal-to-terminal connection component; a case that houses the flexible wiring component, the first terminal-to-terminal connecting component, and the second terminal-to-terminal connecting component through an opening; Equipped with the flexible wiring component includes a wiring main body that is formed flat and flexible, and that includes an insulating coating that encloses a group of voltage detection wires that electrically connect a battery module in which a plurality of battery cells are arranged in a row to a battery monitoring unit that monitors the battery state of each of the battery cells; The battery cell has positive and negative electrode terminals provided on the same plane in a cell body with a gap between them, the battery module includes a first electrode terminal group in which one electrode terminal of each of the plurality of battery cells is arranged in an arrangement direction of the battery cells, and a pair of the one electrode terminals adjacent to each other in the arrangement direction are electrically connected by the first inter-terminal connection part for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminal of each of the battery cells is arranged in the arrangement direction, and a pair of the other electrode terminals adjacent to each other in the arrangement direction are electrically connected by the second inter-terminal connection part for each of the pair of the other electrode terminals, the voltage detection line group includes: a first voltage detection line provided for each of the first terminal-to-terminal connection components, electrically connecting the first terminal-to-terminal connection component and the battery monitoring unit; and a second voltage detection line provided for each of the second terminal-to-terminal connection components, electrically connecting the second terminal-to-terminal connection component and the battery monitoring unit, the wiring main body includes a first main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the first electrode terminal group, a second main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the second electrode terminal group, and a connecting wiring portion having one end portion connected to one end portion of the first main branch wiring portion and the other end portion connected to one end portion of the second main branch wiring portion, connecting the one ends of the first main branch wiring portion and the second main branch wiring portion to each other and electrically connecting them to the battery monitoring unit, the first main branch wiring portion is bent at a first main branch bending portion at a boundary between the one end portion of the first main branch wiring portion and the one end portion of the connecting wiring portion and extends in the arrangement direction; the second main branch wiring portion is bent at a second main branch bending portion at a boundary between the one end portion of the second main branch wiring portion and the other end portion of the connecting wiring portion and extends in the arrangement direction; the connecting wiring portion includes a main connecting wiring portion electrically connected to the battery monitoring unit, a first sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the first main branch wiring portion via the first main branch bend portion, thereby electrically connecting the main connecting wiring portion and the first main branch wiring portion, and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bend portion, thereby electrically connecting the main connecting wiring portion and the second main branch wiring portion, the first sub-connecting wiring portion is bent at a first sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the first main branch wiring portion; the second sub-connecting wiring portion is bent at a second sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, the case has a first accommodating chamber that accommodates the first main branch wiring portion from a first opening, a second accommodating chamber that accommodates the second main branch wiring portion from a second opening, a third accommodating chamber that accommodates the first terminal-to-terminal connecting component from a third opening, a fourth accommodating chamber that accommodates the second terminal-to-terminal connecting component from a fourth opening, a first cover portion that closes the first opening, a second cover portion that closes the second opening, a third cover portion that closes the third opening, a fourth cover portion that closes the fourth opening, a first hinge portion that rotates the third cover portion between an open position and a closed position with respect to the third opening, and a second hinge portion that rotates the fourth cover portion between the open position and the closed position with respect to the fourth opening, The insulating coating includes a base film and a coverlay film for each surface that covers a surface of the base film, the first voltage detection line has a first terminal-side routing portion that is routed on one surface of the base film and electrically connected to the first terminal-to-terminal connecting component, a first mating-side routing portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit, and a first circuit interchange portion that electrically connects the first terminal-side routing portion and the first mating-side routing portion via a through-hole in the base film in the connecting wiring portion, a second terminal side wiring portion that is routed on one surface of the base film and electrically connected to the second terminal connection component; a second mating side wiring portion that is routed on the other surface of the base film and electrically connected to the battery monitoring unit; and a second circuit replacement portion that electrically connects the second terminal side wiring portion and the second mating side wiring portion via a through hole in the base film in the connecting wiring portion.

5. A flexible wiring component; a first terminal-to-terminal connection component; a second terminal-to-terminal connection component; a case that houses the flexible wiring component, the first terminal-to-terminal connecting component, and the second terminal-to-terminal connecting component through an opening; Equipped with the flexible wiring component includes a wiring main body that is formed flat and flexible, and that includes an insulating coating that encloses a group of voltage detection wires that electrically connect a battery module in which a plurality of battery cells are arranged in a row to a battery monitoring unit that monitors the battery state of each of the battery cells; The battery cell has positive and negative electrode terminals provided on the same plane in a cell body with a gap between them, the battery module includes a first electrode terminal group in which one electrode terminal of each of the plurality of battery cells is arranged in an arrangement direction of the battery cells, and a pair of the one electrode terminals adjacent to each other in the arrangement direction are electrically connected by the first inter-terminal connection part for each of the pair of the one electrode terminals; and a second electrode terminal group in which the other electrode terminal of each of the battery cells is arranged in the arrangement direction, and a pair of the other electrode terminals adjacent to each other in the arrangement direction are electrically connected by the second inter-terminal connection part for each of the pair of the other electrode terminals, the voltage detection line group includes: a first voltage detection line provided for each of the first terminal-to-terminal connection components, electrically connecting the first terminal-to-terminal connection component and the battery monitoring unit; and a second voltage detection line provided for each of the second terminal-to-terminal connection components, electrically connecting the second terminal-to-terminal connection component and the battery monitoring unit, the wiring main body includes a first main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the first electrode terminal group, a second main branch wiring portion extending in the arrangement direction between the first electrode terminal group and the second electrode terminal group and close to the second electrode terminal group, and a connecting wiring portion having one end portion connected to one end portion of the first main branch wiring portion and the other end portion connected to one end portion of the second main branch wiring portion, connecting the one ends of the first main branch wiring portion and the second main branch wiring portion to each other and electrically connecting them to the battery monitoring unit, the first main branch wiring portion is bent at a first main branch bending portion at a boundary between the one end portion of the first main branch wiring portion and the one end portion of the connecting wiring portion and extends in the arrangement direction; the second main branch wiring portion is bent at a second main branch bending portion at a boundary between the one end portion of the second main branch wiring portion and the other end portion of the connecting wiring portion and extends in the arrangement direction; the connecting wiring portion includes a main connecting wiring portion electrically connected to the battery monitoring unit, a first sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the first main branch wiring portion via the first main branch bend portion, thereby electrically connecting the main connecting wiring portion and the first main branch wiring portion, and a second sub-connecting wiring portion branched from the main connecting wiring portion and connected to the one end of the second main branch wiring portion via the second main branch bend portion, thereby electrically connecting the main connecting wiring portion and the second main branch wiring portion, the first sub-connecting wiring portion is bent at a first sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the first main branch wiring portion; the second sub-connecting wiring portion is bent at a second sub-branch bending portion branched from the main connecting wiring portion and extends to the one end of the second main branch wiring portion, the case has a first accommodating chamber that accommodates the first main branch wiring portion from a first opening, a second accommodating chamber that accommodates the second main branch wiring portion from a second opening, a third accommodating chamber that accommodates the first terminal-to-terminal connecting component from a third opening, a fourth accommodating chamber that accommodates the second terminal-to-terminal connecting component from a fourth opening, a first cover portion that closes the first opening, a second cover portion that closes the second opening, a third cover portion that closes the third opening, a fourth cover portion that closes the fourth opening, a first hinge portion that rotates the third cover portion between an open position and a closed position with respect to the third opening, and a second hinge portion that rotates the fourth cover portion between the open position and the closed position with respect to the fourth opening, At least one of the first main branch wiring section and the second main branch wiring section, which is a circuit expansion target, has an expansion circuit wiring section that protrudes from an end portion on the side of a space surrounded by the first main branch wiring section, the second main branch wiring section, and the connecting wiring section, and is folded back 180 degrees from a base portion on this end portion and overlapped on the main branch wiring section which is a circuit expansion target, A conductive module characterized in that the group of voltage detection lines includes the first voltage detection line or the second voltage detection line in the main branch wiring section of the circuit addition target that passes through the additional circuit wiring section.

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