Holding structure of circuit body

Abstract

To provide a holding structure of a circuit body which can suppress damages of an electric wire in a state of holding a circuit body having a sheet material and an electric wire by a case.SOLUTION: The holding structure of the circuit body includes: a circuit body 31 having a sheet material 32 and an electric wire 33; and a case 70 for holding the circuit body 31. The case 70 has: a groove part 71 for storing the sheet material 32; a cover part 76 for covering an opening of the groove part 71; and a pair of board-like parts 78 protruding from a groove bottom of the groove 71 with a gap S in between in a width direction of the groove part 71. The circuit body 31 is stored in the groove part 71 so that the sheet material 32 is placed on protruding end surfaces of the pair of board-like parts 78 and the electric wire 33 is extended through the gap S. Each of the protruding end surfaces of a pair of board-like parts 78b has such a surface shape that a position of a protruding end surface near a terminal part 32b of the sheet material 32 is more distant from the groove bottom than a position of a protruding end surface in a part distant from the terminal part 32b in a direction in which the groove part 71 is extended.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a circuit body holding structure comprising a circuit body having a sheet material and a conductor, and a case in which the circuit body is held. [Background technology]

[0002] Conventionally, there have been proposed holding structures for holding sheet material in a case. In one conventional sheet material holding structure, a protrusion provided on the case is inserted into a through hole provided in the center of the sheet material in the width direction, thereby holding the sheet material in a predetermined position in the case (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-113108 Summary of the Invention [Problem to be solved by the invention]

[0004] When a circuit body having an electric wire extending along the surface of a sheet material is held in a case, if the electric wire drawn out from the terminal portion of the sheet material moves relative to the sheet material due to an external force being applied to the electric wire while the circuit body is held in the case, the electric wire may be pressed against the terminal portion of the sheet body, damaging the resin layer on the surface of the electric wire. From the viewpoint of maintaining the insulation of the electric wire, it is desirable to suppress the damage to the resin layer as much as possible.

[0005] An object of the present invention is to provide a circuit body holding structure that can prevent damage to the electric wires when the circuit body, which has a sheet material and electric wires, is held in a case. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the holding structure for a circuit body according to the present invention has the following features.

[0007] A circuit body holding structure comprising: a circuit body having a sheet material and an electric wire; and a case for holding the circuit body, The case is the sheet material is accommodated in a groove portion, a cover portion that covers an opening of the groove portion, and a pair of platform portions that protrude from a groove bottom of the groove portion toward the opening with a gap therebetween in a width direction of the groove portion and have a protruding height from the groove bottom that is smaller than a groove depth of the groove portion, The circuit body includes: The sheet material has a structure in which the electric wire extends along a sheet surface of the sheet material, the sheet material is placed on the protruding end surfaces of the pair of the base portions, and the sheet material is accommodated in the groove portion so that the electric wire passes through the gap between the pair of the base portions, The protruding end surfaces of each of the pair of platform portions are The groove has a surface shape such that, in the extension direction of the groove, the position of the protruding end face at a portion close to the terminal portion of the sheet material is farther from the groove bottom than the position of the protruding end face at a portion away from the terminal portion. It has a structure for retaining the circuit body. Effect of the Invention

[0008] According to the circuit body holding structure of the present invention, when the circuit body is accommodated in the groove of the case, a sheet material is placed on the protruding end faces of a pair of pedestal parts that protrude from the groove bottom toward the opening of the groove, and an electric wire is passed through the gap between the pair of pedestal parts. The protruding end faces of the pedestal parts have a surface shape such that the position of the protruding end face at a point close to the terminal part of the sheet material is farther from the groove bottom than the position of the protruding end face at a point farther from the terminal part in the extension direction of the groove. Therefore, the sheet material placed on the pedestal parts is held in the groove of the case in a curved position that moves away from the groove bottom as it approaches the terminal part of the sheet material. Therefore, compared to the case where the protruding end faces of the pedestal parts are parallel to the groove bottom, even if the electric wire drawn out from the terminal part of the sheet material moves relative to the sheet material, the electric wire is less likely to be pressed against the terminal part of the sheet material. Therefore, the holding structure of this configuration can suppress damage to the electric wire when the circuit body having the sheet material and the electric wire is held in the case.

[0009] The present invention has been briefly described above. The details of the present invention will become clearer by reading the detailed description of the invention described below with reference to the accompanying drawings. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a top view showing a battery module including a busbar module having a circuit body holding structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view showing the battery module shown in FIG. [Diagram 3] FIG. 3 is an enlarged view of part A in FIG. [Figure 4] FIG. 4 is an enlarged view of part A in FIG. 2 with the cover part open. [Diagram 5] FIG. 5 is a perspective view showing part A in FIG. 2 with the cover part open. [Figure 6] FIG. 6 is a diagram corresponding to FIG. 4, in which the thermistor and the circuit body are omitted. [Figure 7] FIG. 7 is a cross-sectional view taken along line BB of FIG. [Figure 8] FIG. 8 is an enlarged view of part C in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <Embodiment> Hereinafter, a battery module 1 including a busbar module 4 having a holding structure for a circuit body 31 (see FIG. 2, etc.) according to an embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, "front", "rear", "left", "right", "upper" and "lower" are defined as shown in FIGS. 1 to 8. The "front-rear direction", "left-right direction" and "up-down direction" are mutually perpendicular.

[0012] As shown in FIG. 1, the battery module 1 is configured by attaching a pair of left and right busbar modules 4 extending in the front-rear direction to the left and right side surfaces of a rectangular parallelepiped assembled battery 2 that is long in the front-rear direction. The assembled battery 2 is configured by stacking a plurality of rectangular parallelepiped battery cells 3 that are short in the front-rear direction in the front-rear direction. If necessary, for each of the pair of left and right busbar modules 4, as shown in FIG. 2, a resin cover 90 that is approximately rectangular and flat and extends in the front-rear direction may be attached to the busbar module 4 so as to cover the outer surface (the outer surface in the left-right direction) of the busbar module 4. The battery module 1 is mounted and used, for example, in an electric vehicle that runs using an electric motor or a hybrid vehicle that runs using both an engine and an electric motor, and is used for applications such as supplying power to the electric motor.

[0013] A pair of electrodes 3a are provided at the lower end of both left and right sides of the battery cell 3 so as to protrude outward in the left-right direction (see FIG. 1). One of the pair of electrodes 3a is a positive electrode, and the other is a negative electrode. In the assembled battery 2, a plurality of battery cells 3 are stacked in the front-rear direction so that the left-right positions of the positive and negative electrodes of adjacent battery cells 3 in the front-rear direction are reversed. Thus, a plurality of electrodes 3a are arranged in a row at each of the lower end of both left and right sides of the assembled battery 2 so that the positive and negative electrodes are alternately arranged in the front-rear direction. The right electrode 3a (one of the positive and negative electrodes) of the battery cell 3 located at the rear end of the assembled battery 2 and the left electrode 3a (the other of the positive and negative electrodes) of the battery cell 3 located at the front end of the assembled battery 2 function as a general electrode (i.e., a general positive electrode and a general negative electrode) 3aa for inputting and outputting power from the assembled battery 2 to an external load (see FIGS. 1 and 2).

[0014] The pair of left and right busbar modules 4 have the same configuration except that they are arranged in opposite directions in the front-rear and left-right directions. Only the right busbar module 4 will be described in detail below, and a detailed description of the left busbar module 4 will be omitted.

[0015] 1 and 2, the right busbar module 4 includes a plurality of intermediate busbars 10 (see FIG. 2), a single end busbar 20, a single thermistor 25, a plurality of voltage detection wires 30 connected respectively to the plurality of intermediate busbars 10 and the single end busbar 20, a circuit body 31 including electric wires extending from the thermistor 25, and a resin case 40. The resin case 40 has an intermediate holding portion 50 that holds the plurality of intermediate busbars 10, and a circuit body holding portion 70 that holds the circuit body 31. The resin case 40 is a resin molded body having a structure in which the intermediate holding portion 50 and the circuit body holding portion 70 are integrally molded.

[0016] As shown in Figs. 1 and 2, the intermediate holding portion 50 is provided so as to extend in the front-rear direction along the right side surface of the battery pack 2, and integrally includes a main body portion 51 extending linearly in the front-rear direction, and a plurality of busbar holding portions 52 (see Fig. 2) arranged in a line in the front-rear direction below the main body portion 51. A main line accommodating groove 53 is formed on the right side surface (outer side in the left-right direction) of the main body portion 51, which is recessed to the left (inner side in the left-right direction) and extends in the front-rear direction. The main line accommodating groove 53 accommodates and wires a plurality of voltage detection wires 30 that are individually connected to the plurality of intermediate busbars 10 and the single end busbar 20. The corresponding intermediate busbars 10 are accommodated and fixed in each busbar holding portion 52 so as to be conductively connected to the "corresponding pair of electrodes 3a" adjacent in the front-rear direction.

[0017] As shown in FIGS. 1 and 2, at the rear end portion of the right side surface of the battery pack 2, an end bus bar 20 is conductively connected to a general electrode 3aa of the battery cells 3 located at the rear end of the battery pack 2.

[0018] The other ends of the multiple voltage detection lines 30 connected to the multiple intermediate bus bars 10 and the end bus bars 20 are connected to a voltage detection device (not shown). This allows the voltage detection device to detect the potential of the "corresponding pair of electrodes 3a" or the corresponding total electrode 3aa that are conductively connected to each voltage detection line 30.

[0019] As shown in Figs. 1 and 2, the circuit body holding part 70 is provided at the front end of the right side surface of the battery pack 2, and holds the circuit body 31 including the electric wire 33 and the sheet material 32. The electric wire 33 is connected to the thermistor 25, and the thermistor 25 is attached to the end of the sheet material 32 by adhesion or the like. The electric wire 33 may be fixed to the sheet surface of the sheet material 32 (i.e., the surface facing the battery cells 3) by an adhesive or the like, or may be integrated with the sheet material 32 via the thermistor 25 without being fixed to the sheet surface of the sheet material 32. In the present application, the structure in which the electric wire 33 extends "along" the sheet surface of the sheet material 32 includes both the former structure (a structure in which the electric wire 33 is fixed to the sheet surface) and the latter structure (a structure in which the electric wire 33 is not fixed to the sheet surface). The structure in which the circuit body holding part 70 holds the circuit body 31 will be described in detail later. As shown in Fig. 3, the thermistor 25 is fixed to the right side surface of the battery cell 3 located at the front end of the assembled battery 2 in a manner that allows it to detect the temperature of that side surface. For example, since the sheet material 32 can flex flexibly in the thickness direction, the manufacturing tolerances of each component can be absorbed by the flexure of the sheet material 32, allowing the thermistor 25 to easily adhere to the right side surface of the battery cell 3. Furthermore, even if the battery cell 3 expands or contracts due to a temperature change, the thermistor 25 can maintain a state of being in close contact with the battery cell 3. The other end of the pair of electric wires 33 connected to the thermistor 25 and extending along the circuit body 31 is connected to a temperature detection device (not shown). This allows the temperature detection device to detect the temperature of the battery cell 3 located at the front end of the assembled battery 2.

[0020] The structure of the circuit body 31 held by the circuit body holding portion 70 will be described below. First, the configuration of the circuit body 31 will be described. As shown in Figs. 4 and 5, the circuit body 31 is an elongated rectangular flat plate extending vertically as a whole, and is configured so that a pair of electric wires 33 extending from the thermistor 25 extends along the sheet surface of the sheet material 32 having a narrow portion in which the width in the front-rear direction narrows between the portion where the thermistor 25 is disposed and the portion where the circuit body is housed in the circuit body holding portion 70. For example, when attaching the pair of electric wires 33 to the sheet material 32, a part of the extending direction of the pair of electric wires 33 can be attached by adhesion or the like so as to be along the longitudinal direction of the sheet material 32. The sheet material 32 is made of a resin such as PET (polyethylene terephthalate). The thermistor 25 is attached to one end (upper end in Fig. 4) 32a of the sheet material 32 in the longitudinal direction. The pair of electric wires 33 extend from the other end (lower end in Fig. 4) 32b of the sheet material 32 in the longitudinal direction. A pair of recesses 34 are formed on each of a pair of edges in the width direction (front-rear direction in FIG. 4) of the sheet material 32 so as not to interfere with the electric wires 33. The pair of recesses 34 are disposed at different positions from each other in the longitudinal direction of the sheet material 32 (the vertical direction in FIG. 4).

[0021] Next, the configuration of the circuit body holding portion 70 will be described. As shown in Fig. 5 etc., the circuit body holding portion 70 has a groove portion 71 that extends in the vertical direction from the front end portion of the main body portion 51 upward along the right side surface of the battery cell 3 located at the front end of the battery pack 2. The groove portion 71 is defined by a bottom wall 72 extending in the vertical direction, a front side wall 73 that protrudes to the right (outside in the left-right direction) from the front end edge of the bottom wall 72 and extends in the vertical direction, and a rear side wall 74 that protrudes to the right (outside in the left-right direction) from the rear end edge of the bottom wall 72 and extends in the vertical direction, and is open to the right (outside in the left-right direction).

[0022] A substantially rectangular flat cover portion 76 is connected to the outer surface of the rear wall 74 via a hinge portion 75. The cover portion 76 is rotatable between a closed state (see FIG. 3) in which it covers the opening of the groove portion 71 and an open state (see FIG. 4 to FIG. 6) in which it does not cover the opening of the groove portion 71.

[0023] 5 and 6, a pair of front and rear columnar protrusions 77 are provided in the groove portion 71 so as to protrude from the front wall 73 and the rear wall 74 toward the inside of the groove portion 71 (inward in the front-rear direction) and extend in the depth direction (left-right direction) of the groove portion 71 in correspondence with the pair of recesses 34 of the circuit body 31. The pair of columnar protrusions 77 are disposed at different positions from each other within the extension range of the cover portion 76 in the extension direction (up-down direction) of the groove portion 71 (i.e., the range covered by the cover portion 76 when the cover portion 76 is in the closed state) in correspondence with the pair of recesses 34.

[0024] 6 and 7, a pair of front and rear pedestal portions 78 are provided in the groove portion 71 so as to protrude from the bottom wall 72 toward the opening of the groove portion 71 (outward in the left-right direction) and to leave a gap S in the width direction (front-rear direction) of the groove portion 71. The protruding height of the pair of front and rear pedestal portions 78 from the bottom wall 72 is smaller than the groove depth (depth in the left-right direction) of the groove portion 71 and is also smaller than the protruding height of the columnar convex portion 77 from the bottom wall 72.

[0025] More specifically, each of the pair of front and rear platform portions 78 is composed of an upper platform portion 78a and a lower platform portion 78b located below the platform portion 78a with a gap therebetween (see FIG. 6). The vertical extension length of the platform portion 78b is longer than the vertical extension length of the platform portion 78a. As can be seen from FIG. 6 and FIG. 7, in the direction in which the groove portion 71 extends (vertical direction), the entire platform portion 78a and the upper portion of the platform portion 78b are located within the extension range of the cover portion 76 (i.e., within the range covered by the cover portion 76 when the cover portion 76 is closed), while the lower portion of the platform portion 78b is located below the extension range of the cover portion 76 (i.e., at a position not covered by the cover portion 76 when the cover portion 76 is closed).

[0026] As shown in Fig. 7 and Fig. 8, the entire protruding end surface (right end surface) of the platform portion 78a and the upper portion (right end surface) of the protruding end surface 78b1 of the platform portion 78b have a parallel surface shape parallel (parallel to the vertical direction) to the groove bottom of the groove portion 71. On the other hand, the lower portion (right end surface) of the protruding end surface 78b1 of the platform portion 78b is continuous without a step from the upper portion (right end surface) of the protruding end surface 78b1 of the platform portion 78b, and has an inclined surface shape that is inclined by a small angle θ (see Fig. 8) so as to gradually move away from the groove bottom of the groove portion 71 (so as to gradually move to the right) as it approaches the lower end of the platform portion 78b. Note that Fig. 7 and Fig. 8 show the cross-sectional shapes of the platform portions 78a and 78b located at the upper part, but the platform portions 78a and 78b located at the lower part also have the same cross-sectional shape as the platform portions 78a and 78b located at the upper part. The action and effect of the lower portion of the protruding end surface 78b1 of the platform portion 78b having an inclined surface shape will be described later.

[0027] As shown in Figures 4 to 6, an engaged portion 79 is provided on the outer surface of the front wall 73. When the cover portion 76 is in the closed state, the engaged portion 79 engages with an engaging portion 83 (see Figures 4 to 6) of the cover portion 76, which will be described later.

[0028] As shown in Figs. 4 to 6, the cover portion 76 is formed with a pair of through holes 81 into which the pair of columnar protrusions 77 are inserted when the cover portion 76 is in a closed state, corresponding to the pair of columnar protrusions 77. An engagement portion 83 is provided on the side edge of the cover portion 76 opposite the hinge portion 75. A plurality (four) of protrusions 82 are provided on the inner surface of the cover portion 76, which are arranged to face the pair of front and rear platform portions 78 in the depth direction (left and right direction) of the groove portion 71 when the cover portion 76 is in a closed state. More specifically, the plurality (four) of protrusions 82 are composed of a pair of front and rear protrusions 82a arranged to face the pair of front and rear platform portions 78a in the depth direction of the groove portion 71 when the cover portion 76 is in a closed state, and a pair of front and rear protrusions 82b arranged to face the upper parts of the pair of front and rear platform portions 78b in the depth direction of the groove portion 71 when the cover portion 76 is in a closed state (see Figs. 6 and 7). When the cover portion 76 is in a closed state, the pair of front and rear protrusions 82b are not disposed opposite the lower portions of the pair of front and rear pedestal portions 78b in the depth direction of the groove portion 71 (see FIG. 7). The configurations of the circuit body 31 and the circuit body holding portion 70 have been described above.

[0029] Next, the operation of holding the circuit body 31 in the circuit body holding portion 70 will be described. First, the cover portion 76 of the circuit body holding portion 70 is opened (see FIG. 6), and the circuit body 31 is accommodated in the groove portion 71 through the opening of the groove portion 71 (see FIGS. 4 and 5). Specifically, the circuit body 31 is accommodated in the groove portion 71 so that the pair of front and rear columnar protrusions 77 are fitted into the pair of recesses 34, the pair of electric wires 33 are passed through the gap S, and the sheet material 32 is placed on the pair of front and rear platform portions 78 (see FIGS. 4, 5, and 7). Here, the pair of recesses 34 are disposed at different positions in the extending direction of the groove portion 71 (up and down direction). As a result, by performing the operation of accommodating the circuit body 31 in the groove portion 71 so that the respective columnar protrusions 77 are fitted into the respective recesses 34, it is possible to naturally prevent the circuit body 31 from being accommodated with the front and back of the sheet material 32 being reversed. It is also possible to accommodate the circuit body 31 while guiding it with the pair of columnar protrusions 77. By passing the pair of electric wires 33 through the gap S, it is possible to prevent problems such as the electric wires 33 interfering with the operation of placing the sheet material 32 on the pair of front and rear platform portions 78 from occurring.

[0030] When the circuit body 31 is accommodated in the groove 71, as shown in Fig. 7, the position of the other end 32b of the sheet material 32 is substantially aligned with the position of the lower ends of the pair of front and rear platform portions 78b in the direction in which the groove 71 extends (the up-down direction). Furthermore, the lower portion of the protruding end surface 78b1 of the platform portion 78b has an inclined surface shape as described above. Therefore, the sheet material 32 is held in the groove 71 in a smoothly curved position so as to gradually move away from the bottom of the groove 71 (i.e., gradually move to the right) as it approaches the other end 32b (see Figs. 7 and 8).

[0031] Next, the cover portion 76 is closed, and the engaging portion 83 of the cover portion 76 is engaged with the engaged portion 79 of the groove portion 71. This results in a state in which the circuit body 31 is held by the circuit body holding portion 70 (see FIGS. 3 and 7).

[0032] In a state where the circuit body 31 is held by the circuit body holding part 70, the engagement between the engaging part 83 and the engaged part 79 prevents the cover part 76 from being opened unintentionally. Furthermore, the pair of front and rear protrusions 82a are arranged to face the pair of front and rear platform parts 78a in the depth direction (left and right direction) of the groove part 71, and the pair of front and rear protrusions 82b are arranged to face the upper parts of the pair of front and rear platform parts 78b in the depth direction (left and right direction) of the groove part 71 (see FIG. 7). As a result, the multiple (four) protrusions 82 regulate the position of the sheet material 32 in the groove part 71 so that the sheet material 32 approaches the protruding end faces 78b1 of the pair of front and rear platform parts 78. Therefore, the sheet material 32 can be properly maintained in the curved position described above. Furthermore, the pair of columnar protrusions 77 of the groove part 71 are inserted into the pair of through holes 81 of the cover part 76 (see FIG. 3 and FIG. 7). As a result, depending on whether the columnar protrusion 77 is inserted into the through hole 81, it can be determined whether the cover portion 76 properly covers the opening of the groove portion 71 or not.

[0033] When the circuit body 31 is held by the circuit body holding portion 70, the position of the circuit body 31 is regulated in the depth direction of the groove portion 71 (left-right direction) by the platform portion 78 of the groove portion 71 and the protrusion portion 82 of the cover portion 76, and in the extension direction of the groove portion 71 (up-down direction), the position of the circuit body 31 is regulated by the engagement between the recess portion 34 of the circuit body 31 and the columnar protrusion portion 77 of the groove portion 71.

[0034] In a state in which the circuit body 31 is held by the circuit body holding portion 70, the sheet material 32 is held in the groove portion 71 in a curved posture so as to move away from the groove bottom of the groove portion 71 as it approaches the other end 32b. As a result, compared to a case in which the entire area of ​​the protruding end face 78b1 of the platform portion 78b is parallel to the groove bottom of the groove portion 71 (i.e., a case in which the entire longitudinal direction (vertical direction) of the sheet material 32 extends parallel to the groove bottom of the groove portion 71), even if the electric wire 33 drawn out from the other end 32b of the sheet material 32 moves relative to the sheet material 32, the electric wire 33 is less likely to be pressed against the terminal portion (particularly, the edge z of the terminal portion; see FIG. 8 ) of the other end 32b of the sheet material 32, so that damage to the electric wire 33 can be suppressed. In addition, the lower portions of the pair of front and rear platform portions 78b on which the portion near the other end 32b of the sheet material 32 is placed are not disposed opposite the pair of front and rear protrusions 82b in the depth direction of the groove portion 71, so that the portion near the other end 32b of the sheet material 32 can flex flexibly in the thickness direction (right direction). Therefore, even if the electric wire 33 comes into contact with the terminal portion (i.e., edge z) of the other end 32b of the sheet material 32, the portion near the other end 32b of the sheet material 32 flexibly in the thickness direction (right direction) due to pressure from the electric wire 33, so that the contact pressure on the terminal portion (i.e., edge z) of the electric wire 33 can be reduced. This also makes it possible to suppress damage to the electric wire 33.

[0035] <Actions and Effects> As described above, according to the holding structure for the circuit body 31 according to the present embodiment, when the circuit body 31 is housed in the groove 71 of the resin case 40 (circuit body holding portion 70), the sheet material 32 is placed on the protruding end faces of the pair of pedestal portions 78a, 78b protruding from the groove bottom of the groove 71 toward the opening, and the electric wire 33 is passed through the gap S between the pair of pedestal portions 78. The protruding end face 78b1 of the pedestal portion 78 (78b) has a surface shape such that the position of the protruding end face 78b1 at a portion close to the terminal portion (other end 32b) of the sheet material 32 is farther from the groove bottom in the extending direction of the groove 71 than the position of the protruding end face 78b1 at a portion farther from the terminal portion (other end 32b). Therefore, the sheet material 32 placed on the pedestal portion 78 (78b) is held in the groove 71 in a curved position so as to be farther from the groove bottom as it approaches the terminal portion (other end 32b) of the sheet material 32. Therefore, compared to the case where the protruding end surface 78b1 of the platform portion 78 (78b) is parallel to the groove bottom, even if the electric wire 33 drawn out from the other end 32b of the sheet material 32 moves relative to the sheet material 32, the electric wire 33 is less likely to be pressed against the terminal portion (i.e., edge z) (see FIG. 8) of the sheet material 32. Therefore, the holding structure according to this embodiment can prevent the electric wire 33 from being damaged in a state in which the circuit body 31 having the sheet material 32 and the electric wire 33 is held in the resin case 40 (circuit body holding portion 70).

[0036] Furthermore, the protruding end surface 78b1 of the platform portion 78 (78b) has an inclined surface shape that gradually inclines away from the groove bottom as it approaches the terminal portion (other end 32b) of the sheet material 32. Therefore, the sheet material 32 placed on the platform portion 78 (78b) can be curved smoothly along the protruding end surface 78b1. Therefore, compared to when the sheet material 32 is bent at a steep angle, the sheet material 32 can be curved in the above-mentioned curved position without applying an excessive load to the sheet material 32.

[0037] Furthermore, the protrusions 82 of the cover portion 76 regulate the position of the sheet material 32 in the groove portion 71 so that the sheet material 32 is aligned with the protruding end faces of the platform portions 78a and 78b. This makes it possible to properly maintain the sheet material 32 in the curved position described above.

[0038] <Other aspects> The present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, etc. are possible. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

[0039] For example, in the above embodiment, the lower portion of the protruding end surface 78b1 of the platform portion 78b provided in the groove portion 71 of the case 70 is connected to the upper portion of the protruding end surface 78b1 of the platform portion 78b without any step, so that the protruding end surface 78b1 has an inclined surface shape. In contrast, the lower and upper portions of the protruding end surface 78b1 of the platform portion 78b may be connected in a stepped manner (i.e., with a step). Even in this case, the sheet material 32 has the curved posture described above.

[0040] The battery cells 3 constituting the battery module 1 have a positive electrode 3a arranged on one of the left and right side surfaces, and a negative electrode 3a arranged on the other of the left and right side surfaces. In contrast, the battery cells 3 constituting the battery module 1 may have a positive electrode 3a arranged on one of the left and right sides of the upper surface, and a negative electrode 3a arranged on the other left and right side of the upper surface. In addition, the battery cells 3 may be configured so that the battery components are sandwiched between conductive plates that constitute the electrodes 3a, instead of the protruding electrodes 3a described above.

[0041] Furthermore, in the above embodiment, the intermediate bus bar 10 is configured to be connected to one positive electrode and one negative electrode of the battery cells 3. However, the intermediate bus bar 10 may be configured to be connected to multiple positive electrodes and multiple negative electrodes of the battery cells 3.

[0042] Furthermore, in the above embodiment, a retention structure that retains the intermediate busbar 10 and the end busbars 20 in the resin case 40 is applied to the busbar module 4. However, this retention structure may also be applied when retaining terminals in a case such as the resin case 40 when electrically connecting terminals such as the intermediate busbar 10 to connection objects other than the electrodes 3a of the battery cells 3 (for example, input / output terminals of various electrical components, bus bars for power supply, exterior casings of various electrical components, or the frame of a vehicle on which various electrical components are mounted).

[0043] Here, the features of the embodiment of the holding structure for the circuit body 31 according to the present invention described above will be briefly summarized and listed in the following [1] to [3].

[0044] [1] A holding structure for a circuit body (31), comprising: a circuit body (31) having a sheet material (32) and an electric wire (33); and a case (70) in which the circuit body (31) is held, The case (70) is the sheet material (32) is accommodated in a groove portion (71); a cover portion (76) that covers an opening of the groove portion (71); and a pair of platform portions (78) that protrude from a bottom of the groove portion (71) toward the opening with a gap (S) therebetween in a width direction of the groove portion (71) and that have a protruding height from the groove bottom that is smaller than a groove depth of the groove portion (71); The circuit body (31) is the sheet material (32) has a structure in which the electric wire (33) extends along a sheet surface of the sheet material (32), the sheet material (32) is placed on the protruding end surfaces of the pair of base-shaped portions (78), and the electric wire (33) is accommodated in the groove portion (71) so as to pass through the gap (S) between the pair of base-shaped portions (78); The protruding end surface (78b1) of each of the pair of platform portions (78b) is The groove portion (71) has a surface shape such that, in the extension direction of the groove portion (71), a position of the protruding end surface (78b1) at a portion close to the terminal portion (32b) of the sheet material (32) is farther from the groove bottom than a position of the protruding end surface (78b1) at a portion away from the terminal portion (32b). Circuit body retention structure.

[0045] According to the circuit body holding structure of the above-mentioned [1], when the circuit body is accommodated in the groove of the case, a sheet material is placed on the protruding end faces of a pair of pedestal parts that protrude from the groove bottom toward the opening of the groove, and an electric wire is passed through the gap between the pair of pedestal parts. The protruding end faces of the pedestal parts have a surface shape such that the position of the protruding end face at a portion close to the terminal part of the sheet material is farther from the groove bottom than the position of the protruding end face at a portion farther from the terminal part in the extension direction of the groove. Therefore, the sheet material placed on the pedestal parts is held in the groove of the case in a curved position that moves away from the groove bottom as it approaches the terminal part of the sheet material. Therefore, compared to the case where the protruding end faces of the pedestal parts are parallel to the groove bottom, even if the electric wire drawn out from the terminal part of the sheet material moves relative to the sheet material, the electric wire is less likely to be pressed against the terminal part of the sheet material. Therefore, the holding structure of this configuration can suppress damage to the electric wire when the circuit body having the sheet material and the electric wire is held in the case.

[0046] [2] In the holding structure described in [1] above, The protruding end surface (78b1) of each of the pair of platform portions (78b) is The protruding end surface (78b1) has an inclined surface shape inclined so as to be gradually separated from the groove bottom as it approaches the terminal portion (32b) of the sheet material (32). Circuit body retention structure.

[0047] According to the circuit body holding structure of the configuration [2] above, the protruding end surface of the platform has an inclined surface shape that gradually moves away from the groove bottom (i.e., without any step) as it approaches the terminal portion of the sheet material. Therefore, the sheet material placed on the platform can be curved smoothly along the protruding end surface. Therefore, compared to when the sheet material is bent at a steep angle (for example, when there is a step), the sheet material can be made to take the above-mentioned curved position without applying excessive load to the sheet material.

[0048] [3] In the holding structure described in [1] above, The cover portion (76) is The cover portion (76) has a protrusion (82) on a cover surface thereof, The protrusion (82) is and restricting a position of the sheet material (32) so that the cover portion (76) faces the sheet material (32) when the cover portion (76) is disposed to cover the opening and brings the sheet material (32) close to the protruding end surface. Circuit body retention structure.

[0049] According to the circuit body holding structure of the configuration [3] above, the protrusion of the cover regulates the position of the sheet material in the groove so that the sheet material is aligned with the protruding end face, thereby making it possible to properly maintain the sheet material in the curved position described above. [Explanation of symbols]

[0050] 31 Circuit body 32 Sheet material 32b Other end (terminal part) 33 Electric wire 70 Circuit body holding part (case) 71 Groove 76 Cover part 78 Trap 78b Trapezoid 78b1 Projecting end face 82 Protrusion S Gap

Claims

1. A circuit body holding structure comprising: a circuit body having a sheet material and an electric wire; and a case for holding the circuit body, The case is the sheet material is accommodated in a groove portion, a cover portion that covers an opening of the groove portion, and a pair of platform portions that protrude from a groove bottom of the groove portion toward the opening with a gap therebetween in a width direction of the groove portion and have a protruding height from the groove bottom that is smaller than a groove depth of the groove portion, The circuit body includes: The sheet material has a structure in which the electric wire extends along a sheet surface of the sheet material, the sheet material is placed on the protruding end surfaces of the pair of the base portions, and the sheet material is accommodated in the groove portion so that the electric wire passes through the gap between the pair of the base portions, The protruding end surfaces of each of the pair of platform portions are The groove has a surface shape such that, in the extension direction of the groove, the position of the protruding end face at a portion close to the terminal portion of the sheet material is farther from the groove bottom than the position of the protruding end face at a portion away from the terminal portion. Circuit body retention structure.

2. The holding structure according to claim 1, The protruding end surfaces of each of the pair of platform portions are The protruding end surface has an inclined surface shape in which the protruding end surface is inclined so as to be gradually separated from the groove bottom as it approaches the terminal portion of the sheet material. Circuit body retention structure.

3. The holding structure according to claim 1, The cover portion is A protrusion is provided on a cover surface of the cover portion, The protrusion is the cover portion faces the sheet material when the cover portion is disposed to cover the opening, and restricts a position of the sheet material so as to bring the sheet material close to the protruding end surface; Circuit body retention structure.

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