Wiring module

Abstract

A wiring module (20) is provided with a plurality of bus bars, a plurality of circuit boards, a plurality of voltage detection lines (40), a protector (50) that holds the plurality of bus bars, the plurality of circuit boards, and the plurality of voltage detection lines (40), and a connector (60) that is located outside the protector (50). A main line accommodating part (52) for accommodating a main line (M) formed by bundling a plurality of voltage detection lines (40) into a whole and a fixing part (58) for fixing the main line (M) to the protector (50) are arranged in the protector (50), and the main line (M) is provided with a straight line part (M1) extending in a first direction and an excess length part (M2) formed by shrinking a part of the straight line part (M1) in the first direction. The main line housing section (52) has: a straight line routing region (M1R) in which the straight line section (M1) is routed; a lead-out opening (56) through which the main line (M) is led out from the inside of the protector (50) to the outside; and an excess length routing region (M2R) which is disposed between the lead-out opening (56) and the fixed section (58) and in which the excess length section (M2) is routed.

Description

Technical Field

[0001] The present disclosure relates to a wiring module. Background Art

[0002] As a wiring module mounted on a vehicle such as an electric vehicle or a hybrid vehicle, for example, a wiring module described in Japanese Patent Application Laid-Open No. 2019-36471 (hereinafter referred to as Patent Document 1) is known. The wiring module includes an insulating protection member, a bus bar that connects electrodes of a pair of adjacent power storage elements to each other, and a detection wire connected to the bus bar, and the wiring module is placed on the upper surface of a power storage element group.

[0003] The insulating protection member includes a terminal part housing portion that houses a plurality of bus bars and a wire housing portion that houses a plurality of detection wires extending from the plurality of bus bars. The plurality of detection wires are bent backward in the wire housing portion and extend outward from a wire outlet formed in the rear wall of the wire housing portion. The plurality of detection wires extending outward from the insulating protection member are bundled to form an integrated main line, and a connector is provided at the protruding end of the main line. The connector can be fitted with a target connector provided on an external device. In order to perform the fitting operation of the connector with the target connector, a surplus length portion is set in the main line. Prior Art Documents Patent Documents

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-36471 Summary of the Invention Problems to be Solved by the Invention

[0005] In the above-described wiring module, in order to easily connect the connector to the mating connector, it is desirable to have a surplus length portion that protrudes outward from the wire outlet to the outside of the insulating protection member. In this case, as the space required for the configuration of the wiring module, in addition to the space for arranging the insulating protection member, the space for arranging the surplus length portion is also required. However, in recent years, the space for arranging the wiring module is expected to be narrowed. Therefore, it is sometimes difficult to secure the space for arranging the surplus length portion.

[0006] The present disclosure has been made based on the above circumstances, and an object thereof is to reduce the protrusion amount of the connector and the main line while providing the surplus length portion. Means for Solving the Problems

[0007] The wiring module of the present disclosure is installed in a battery cell group formed by arranging a plurality of battery cells having electrode terminals in a first direction. The wiring module includes: a plurality of bus bars; a plurality of circuit boards; a plurality of voltage detection lines; a protector that holds the plurality of bus bars, the plurality of circuit boards, and the plurality of voltage detection lines; and a connector located outside the protector. The bus bar is connected to the electrode terminal, the circuit board is connected to the bus bar, one end of the voltage detection line is connected to the circuit board, and the other end of the voltage detection line is connected to the connector. A main line storage portion and a fixing portion are provided inside the protector. The main line storage portion stores a main line formed by bundling the plurality of voltage detection lines together, and the fixing portion fixes the main line to the protector. The main line has a straight portion extending in the first direction and a redundant length portion that contracts a part of the straight portion in the first direction. The main line storage portion has a straight layout area for laying out the straight portion, an outlet for leading the main line out from the inside of the protector, and a redundant length layout area disposed between the outlet and the fixing portion for laying out the redundant length portion. Advantages of the Invention

[0008] According to the present disclosure, it is possible to reduce the protrusion amount of the connector and the main line while providing the redundant length portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic view of a vehicle equipped with the battery module of Embodiment 1. Figure 2 It is a top view of the wiring module and the battery cell group. Figure 3 It is a top view of the wiring module and the battery cell group with the cover removed. Figure 4 It is an enlarged top view showing Figure 3 Enlarged view of portion A. Figure 5 It is Figure 4 Sectional view taken along line B-B of Figure 6 It is Figure 4 Sectional view taken along line C-C of Figure 7 It is Figure 4 Sectional view taken along line D-D of Figure 8 It is an enlarged top view showing with Figure 4 A part of the main line and the connector removed. Figure 9 It is a view showing Figure 4 State where the redundant length portion of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be described by way of example. (1) The wiring module of the present disclosure is mounted on a battery cell group formed by arranging a plurality of battery cells having electrode terminals in a first direction. The wiring module includes: a plurality of bus bars; a plurality of circuit boards; a plurality of voltage detection lines; a protective member that holds the plurality of bus bars, the plurality of circuit boards, and the plurality of voltage detection lines; and a connector located outside the protective member. The bus bar is connected to the electrode terminal, the circuit board is connected to the bus bar, one end of the voltage detection line is connected to the circuit board, and the other end of the voltage detection line is connected to the connector. A main line storage portion and a fixing portion are provided inside the protective member. The main line storage portion stores a main line formed by bundling the plurality of voltage detection lines into one body, and the fixing portion fixes the main line to the protective member. The main line has a straight portion extending in the first direction and a slack portion that contracts a part of the straight portion in the first direction. The main line storage portion has a straight layout area for laying out the straight portion, an outlet for leading the main line from the inside of the protective member to the outside, and a slack layout area disposed between the outlet and the fixing portion for laying out the slack portion.

[0011] When the connector is fitted with the mating connector of an external device, by pulling the connector in the first direction, the slack portion extends in the first direction, and the main line can be pulled out from the outlet to the outside of the protective member. Since the main line pulled out from the outlet functions as a slack, it is easy to fit the connector with the mating connector. In addition, after the connector is fitted with the mating connector, by pressing the main line into the protective member from the outside in the first direction, the slack portion of the main line can be stored in the slack layout area.

[0012] Since the main line is fixed to the protective member by the fixing portion, when the connector is pulled to pull out the main line from the outlet, the tensile stress thereof can be prevented from being transmitted to each voltage detection line. In addition, when vibration is transmitted from the vehicle to the main line, since the vibration can be suppressed by the fixing portion, the vibration can be prevented from being transmitted to each voltage detection line.

[0013] Since the main line storage portion having a slack layout area for laying out the slack portion of the main line is provided inside the protective member, the connector can be arranged near the outlet outside the protective member. In addition, the protrusion amount of the connector and the main line when the connector is pulled to pull out the main line from the outlet can be reduced. That is, the protrusion amount of the connector and the main line can be reduced while providing the slack portion. Therefore, the space required for arranging the wiring module can be reduced.

[0014] (2) Preferably, the protective member has a bus bar accommodating portion for accommodating the plurality of bus bars and a substrate accommodating portion disposed between the main line accommodating portion and the bus bar accommodating portion for accommodating the circuit board. The extra length portion is in a curved shape bulging in a direction approaching the bus bar accommodating portion, and the extra length layout area is located between the fixing portion and the circuit board. The space between the fixing portion and the circuit board can be effectively utilized to set the extra length layout area. In this way, the substrate accommodating portion and the main line accommodating portion can be made closer to each other, the wiring module can be miniaturized, and thus the energy density of the battery pack can be increased corresponding to the miniaturization of the battery pack.

[0015] (3) Preferably, a plurality of the circuit boards are accommodated in the substrate accommodating portion, and the extra length layout area is located between the Nth circuit board and the (N + 1)th circuit board counted from the lead-out port side. Even when a plurality of circuit boards are accommodated in the substrate accommodating portion, the space between the Nth circuit board and the (N + 1)th circuit board can be effectively utilized to set the extra length layout area.

[0016] (4) Preferably, the wiring module of the present disclosure further includes a temperature detection line. The plurality of circuit boards are configured to include a first circuit board connected to the bus bar and a second circuit board on which a temperature measuring element is mounted. A plurality of the first circuit boards and the second circuit boards are accommodated in the substrate accommodating portion. One end of the temperature detection line is connected to the second circuit board, and the other end of the temperature detection line is connected to the connector. The main line is formed by bundling the plurality of voltage detection lines and the temperature detection line into one body. A layout rib protruding in a second direction orthogonal to the first direction is provided on the bottom wall of the main line accommodating portion. The main line is laid out separated from the bottom wall of the main line accommodating portion in the second direction by the layout rib. The temperature detection line is laid out between the main line and the bottom wall of the main line accommodating portion in the second direction.

[0017] When the main line is pulled out from the inside of the protective member to the outside in a state where both the temperature detection line and the main line are accommodated in the main line accommodating portion, it is possible that the temperature detection line is pulled and dragged by the main line, and thus a load may be applied to the connection portion between the temperature detection line and the second circuit board.

[0018] According to the above structure, since the laying ribs are provided on the bottom wall of the main line storage portion, the main line is in a state of being placed on the laying ribs and is laid at a position away from the bottom wall of the main line storage portion. On the other hand, since the temperature detection line is laid between the main line and the bottom wall of the main line storage portion in the second direction, the temperature detection line can be stored in the main line storage portion without contacting the main line. Therefore, when the main line is pulled out from the inside of the protective member to the outside, it is possible to suppress the temperature detection line from being pulled or dragged by the main line, and thus it is possible to suppress the application of a load to the connection portion between the temperature detection line and the second circuit board.

[0019] [Details of the Embodiment of the Present Disclosure] Hereinafter, embodiments of the present disclosure will be described. The present disclosure is not limited to these examples, but refers to what is shown in the claims and includes all changes within the meaning equivalent to the claims and the scope.

[0020] <Embodiment> Refer to Figures 1 to 9 Embodiment 1 of the present disclosure will be described. The power storage module 10 having the wiring module 20 of the present embodiment is applied to the power storage assembly 2 mounted on the vehicle 1 as shown, for example. Figure 1 The power storage assembly 2 is mounted on a vehicle 1 such as an electric vehicle or a hybrid vehicle and is used as a drive source of the vehicle 1. In the following description, for a plurality of identical components, sometimes only a part of the components are labeled with reference numerals, and the reference numerals of other components are omitted.

[0021] As Figure 1 shown, the power storage assembly 2 is disposed near the center of the vehicle 1. A PCU 3 (Power Control Unit) is disposed at the front of the vehicle 1. The power storage assembly 2 and the PCU 3 are connected by a wiring harness 4. The power storage assembly 2 and the wiring harness 4 are connected by a connector (not shown). The power storage assembly 2 includes a power storage module 10 having a plurality of power storage elements 11. Hereinafter, except Figure 1 otherwise, the direction indicated by the arrow line Z will be described as the upper direction, the direction indicated by the arrow line X will be described as the front direction, and the direction indicated by the arrow line Y will be described as the left direction.

[0022] As Figure 2 shown, the power storage module 10 has a rectangular shape in plan view that is long in the front-rear direction (an example of the first direction) and short in the left-right direction (an example of the third direction), and a pair of power storage modules 10 are arranged and disposed in the left-right direction. The power storage module 10 includes a power storage element group 11G formed by arranging power storage elements 11 in the front-rear direction and a wiring module 20 mounted on the upper surface of the power storage element group 11G. The power storage element 11 has a flat rectangular parallelepiped shape in which power storage elements are housed inside. In Figure 2 and Figure 3In the power storage module 10 on the left side, the state after removing the bus bar 30 is shown. The power storage element 11 has a pair of electrode terminals 11T at positions on the upper surface near the right end and near the left end. One of the pair of electrode terminals 11T is the positive electrode, and the other is the negative electrode.

[0023] [Wiring module] As Figures 2 to 4 shown, the wiring module 20 includes a bus bar 30 connected to the electrode terminal 11T of the power storage element 11, a first circuit board 21 connected to the bus bar 30, a second circuit board 24 on which a temperature measuring element 26 is mounted, a voltage detection line 40 connected to the first circuit board 21, a temperature detection line 41 connected to the second circuit board 24, and a protective member 50 that holds the bus bar 30, the first circuit board 21, the second circuit board 24, the voltage detection line 40, and the temperature detection line 41. In addition, the first circuit board 21 and the second circuit board 24 correspond to the "circuit board".

[0024] [Bus bar] The bus bar 30 is made of a metal plate and is square in plan view. The bus bar 30 includes a connection bus bar 30A that connects between the electrode terminals 11T adjacent in the stacking direction (front-rear direction) of the plurality of power storage elements 11 and an output bus bar 30B that connects to the electrode terminal 11T of the power storage element 11 disposed at the end in the stacking direction. The output bus bar 30B connects the total positive electrode or the total negative electrode of the plurality of power storage elements 11 to an external device. The connection between the bus bar 30 and the electrode terminal 11T is performed by welding or the like. The bus bar 30 is housed in the bus bar housing portion 51 of the following protective member 50.

[0025] [First circuit board] In the present embodiment, the first circuit board 21 is a flexible board, and is formed by forming a conductive circuit on the surface of a flexible insulating sheet using printed wiring technology. The first circuit board 21 includes a board main body 22 and a protruding portion 23 that protrudes from the board main body 22. The board main body 22 is substantially square in plan view. The board main body 22 is fixed to the mounting surface 54 of the following protective member 50. For example, insertion holes are provided in the board main body 22, and protrusions protruding from the mounting surface 54 are inserted into the insertion holes, but no detailed description is given thereof. A wire connection pad 22A is provided at one end of the conductive circuit in the board main body 22. The wire connection pad 22A is connected to the voltage detection line 40 by soldering or the like.

[0026] The extension portion 23 is roughly U-shaped when viewed from above, and is configured to be retractable. By providing the extension portion 23, the end (top end) of the extension portion 23 on the side opposite to the substrate body 22 is allowed to be displaced by a predetermined dimension relative to the substrate body 22. The other end of the conductive circuit is arranged at the top end of the extension portion 23 (not shown). The other end of the conductive circuit is electrically connected to the busbar 30 via the metal piece 15. Although not shown, a fuse or the like may also be provided in the conductive circuit of the first circuit substrate 21.

[0027] [Second circuit board] In the present embodiment, the second circuit substrate 24 is configured as a flexible substrate, and is configured by forming a conductive circuit on the surface of a flexible insulating sheet using printed wiring technology. The second circuit substrate 24 includes a substrate body 25 and a temperature measuring element 26 mounted on a connection pad of the substrate body 25. The substrate body 25 is roughly T-shaped when viewed from above. Like the substrate body 22 of the first circuit substrate 21, the substrate body 25 is fixed to the mounting surface 54 of the protective member 50 described below. A wire connection pad 25A is provided on the substrate body 25 and is arranged at one end of the conductive circuit. The wire connection pad 25A is connected to the temperature detection line 41 by soldering or the like. As the temperature measuring element 26, for example, a thermistor, a platinum temperature measuring resistor, etc. can be used.

[0028] [Voltage detection line, temperature detection line] Since the voltage detection line 40 connected to the first circuit substrate 21 and the temperature detection line 41 connected to the second circuit substrate 24 have the same structure, the voltage detection line 40 is used as a representative for the repeated structure. The voltage detection line 40 is a well-known structure in which a core wire formed by twisting a plurality of wires is covered with an insulating coating. A component formed by bundling a plurality of voltage detection lines 40 and a plurality of temperature detection lines 41 and winding them in a belt shape or storing them in a corrugated tube is a trunk line M. The trunk line M is stored in the trunk line storage portion 52 of the protective member 50 described below.

[0029] like Figure 4 As shown, the trunk line M has a straight portion M1 extending in the front-rear direction and an excess length portion M2 obtained by contracting a portion of the straight portion M1 in the front-rear direction. The excess length portion M2 is in a curved shape bulging rightward (toward the busbar housing portion 51).

[0030] The plurality of voltage detection lines 40 are connected to a connector 60 at the end on the side opposite to the first circuit substrate 21. The connector 60 is engaged with a counterpart connector of an ECU (Electronic Control Unit) or the like provided outside. The ECU is equipped with a microcomputer, components, etc., and is a well-known structure having functions such as detecting the voltage, current, temperature, etc. of each storage element 11, and controlling the charge and discharge of each storage element 11.

[0031] A connector housing portion 55 for housing a connector 60 is provided at the rear end portion of the protection member 50. The connector housing portion 55 is a space formed by cutting a part of the protection member 50. The rear end of the connector housing portion 55 is aligned with the rear end of the protection member 50. In a state where the connector 60 is housed in the connector housing portion 55, the rear end of the connector 60 does not protrude rearward from the rear end of the protection member 50.

[0032] [Protection member] The protection member 50 is made of an insulating synthetic resin. The protection member 50 includes a protection member main body 50A and a cover 50B that covers the protection member main body 50A from above. In the present embodiment, two covers 50B are provided on one protection member main body 50A (see Figure 2 ).

[0033] [Protection member main body] The protection member main body 50A is in the shape of a tray. As Figure 3 shown, the protection member main body 50A includes a plurality of bus bar housing portions 51 for housing the bus bars 30, a pair of main line housing portions 52 for housing the main line M, and a plurality of substrate housing portions 53 disposed between the bus bar housing portions 51 and the main line housing portions 52. The bus bar housing portions 51 are provided at both end portions of the protection member main body 50A in the left-right direction. The bus bar housing portions 51 are in a frame shape, and the bus bar housing portions 51 arranged in a row in the front-rear direction are separated in the left-right direction to form two rows.

[0034] [Main line housing portion, lead-out port] Two main line housing portions 52 are provided at positions near the left-right center portion of the protection member main body 50A. The main line housing portions 52 are in a groove shape and extend in the front-rear direction. As Figure 5 shown, the main line housing portion 52 includes a bottom wall 52A and a pair of side walls 52B erected upward from the left and right end edges of the bottom wall 52A. As Figure 4 shown, a plurality of cutout portions 52C are formed in the side wall 52B of the main line housing portion 52 on the side of the substrate housing portion 53. The voltage detection line 40 and the temperature detection line 41 can be inserted through the cutout portions 52C between the substrate housing portion 53 and the main line housing portion 52. A lead-out port 56 is provided at the rear end portion of the main line housing portion 52. The main line M can enter and exit between the main line housing portion 52 and the outside of the protection member 50 through the lead-out port 56.

[0035] [Substrate housing portion] The substrate storage section 53 is in a frame shape, and the substrate storage sections 53 arranged in a row in the front-rear direction are separated in the left-right direction to form two rows. A pair of adjacent substrate storage sections 53 are partitioned by a partition wall 57. One first circuit board 21 is stored in one substrate storage section 53. The second circuit board 24 is only stored in the last substrate storage section 53, and both the first circuit board 21 and the second circuit board 24 are stored in this substrate storage section 53. The substrate storage section 53 and the main line storage section 52 are partitioned by the right side wall 52B, and a part of the right side wall 52B forms a curved wall 52D that is bent toward the bus bar storage section 51. The curved wall 52D is only formed in the last substrate storage section 53. The voltage detection line 40 extending from the first circuit board 21 and the temperature detection line 41 extending from the second circuit board 24 are along the curved wall 52D toward the bus bar storage section 51 side, and then toward the main line storage section 52 side, and are led out to the second-to-last substrate storage section 53 through the opening 57A formed in the partition wall 57.

[0036] One first circuit board 21 is stored in the second-to-last substrate storage section 53. The voltage detection line 40 extending from this first circuit board 21 merges with the voltage detection line 40 and the temperature detection line 41 led out from the last substrate storage section 53, and then toward the main line storage section 52 side, and is led out to the main line storage section 52 through the cutout portion 52C of the side wall 52B.

[0037] [Fixing part, straight layout area, extra length layout area] The voltage detection line 40 and the temperature detection line 41 led out from the second-to-last substrate storage section 53 merge with the voltage detection line 40 led out from the third-to-last and subsequent substrate storage sections 53, and then are laid out toward the rear. The merged voltage detection line 40 and temperature detection line 41 are integrated into one bundle by strip winding or the like to form the main line M, and are laid out toward the rear as the main line M.

[0038] The main line M is fixed to the protection member 50 by the fixing part 58. The fixing part 58 is formed of, for example, a bundling band, and is fixed to the protection member 50 by winding around the main line M. The fixing part 58 is provided adjacent to the rear side of the cutout portion 52C that connects the second-to-last substrate storage section 53 and the main line storage section 52. Therefore, the front end of the main line M is located between the cutout portion 52C and the fixing part 58.

[0039] The main line storage part 52 has a linear layout area M1R for laying out the linear part M1 and a slack layout area M2R that is disposed between the lead-out port 56 and the fixing part 58 and for laying out the slack part M2. Since the main line storage part 52 is provided inside the protective member 50, the linear layout area M1R and the slack layout area M2R are also located inside the protective member 50. The slack layout area M2R is, for example, located between the first circuit board 21 and the fixing part 58, and the first circuit board 21 is disposed between the fixing part 58 and the lead-out port 56. Additionally, the slack layout area M2R can also be located between the Nth circuit board and the (N + 1)th circuit board counted from the lead-out port 56 side. Herein, "N" is an integer. For example, the slack layout area M2R is located between the fixing part 58 and the first first circuit board 21 counted from the lead-out port 56 side. More specifically, it is located between the first first circuit board 21 and the second first circuit board 21 counted from the lead-out port 56 side. The slack layout area M2R of the present embodiment is formed by effectively utilizing the space remaining between the partition wall 57 and the first circuit board 21 in the last substrate storage part 53.

[0040] When the connector 60 is stored in the connector storage part 55, the slack part M2 of the main line M is located in the slack layout area M2R and is laid out in a mountain shape along the curved wall 52D. As Figure 7 shown, the vertex of the slack part M2 is located at a position closer to the bus bar storage part 51 than the center in the left-right direction of the slack layout area M2R. As a result, near the vertex of the slack part M2, the substrate storage part 53 narrows in the left-right direction. Additionally, in the slack layout area M2R, the main line M bends sharply to generate a reaction force, but since it is surrounded by the protective member main body 50A and the cover 50B from the up-down direction (an example of the second direction), the main line M does not protrude outside the protective member 50.

[0041] As Figure 9 shown, in a state where the connector 60 is pulled backward and protrudes backward from the connector storage part 55, the slack part M2 is pulled and becomes straight. In the main line storage part 52, the main line M is composed only of the linear part M1. Thus, the connector 60 and a part of the main line M protrude backward from the lead-out port 56 of the protective member 50 and can move freely, enabling the mating operation with the mating connector on the other side. Additionally, since the main line M is fixed by the fixing part 58, when the main line M is pulled backward, the tensile stress thereof is not transmitted to each voltage detection line 40 and each temperature detection line 41.

[0042] In the present embodiment, as Figure 3As shown, the wiring module 20 is long in the front-rear direction, and all the voltage detection lines 40 are arranged toward the connector 60. When considering the dimensional tolerances, assembly tolerances, etc. of each voltage detection line 40, in order to absorb the above-mentioned cumulative tolerances, the slack portion M2 is also a necessary structure. Since such a slack portion M2 is provided inside the protection member 50, miniaturization of the wiring module 20 can be achieved, and a structure corresponding to miniaturization of the battery pack and improvement of the energy density of the battery pack can be realized.

[0043] [Arrangement rib] As Figure 8 shown, an arrangement rib 59 is provided on the bottom wall 52A of the main line storage portion 52. The arrangement rib 59 is located between the curved wall 52D and the second circuit board 24 in the front-rear direction. As Figure 5 shown, the arrangement rib 59 is provided to protrude upward from the bottom wall 52A of the main line storage portion 52. The arrangement rib 59 is arranged with a gap between the two side walls 52B of the main line storage portion 52. As a result, a detection line storage groove 59A is formed between the side surface of the arrangement rib 59 and the opposed side wall 52B.

[0044] A pair of detection line storage grooves 59A are provided on the left and right sides of the arrangement rib 59. The temperature detection lines 41 are stored in the detection line storage grooves 59A. On the other hand, as Figure 5 and Figure 6 shown, the main line M is placed on the upper surface of the arrangement rib 59. The main line M is arranged to be separated from the bottom wall 52A of the main line storage portion 52 in the up-down direction through the arrangement rib 59, and the temperature detection lines 41 are arranged between the main line M and the bottom wall 52A of the main line storage portion 52 in the up-down direction. In this way, contact between the main line M and the pair of temperature detection lines 41 can be avoided. Therefore, when the connector 60 is pulled backward and the main line M is pulled backward, it is possible to avoid the situation where the temperature detection lines 41 are pulled backward by the main line M and a load is applied to the connection portion between the temperature detection lines 41 and the wire connection plate 25A.

[0045] As Figure 8 shown, the pair of temperature detection lines 41 pass through a pair of cutout portions 52C located behind the arrangement rib 59 and are respectively stored in the pair of detection line storage grooves 59A. After passing through the arrangement rib 59, the pair of temperature detection lines 41 pass through a pair of cutout portions 52C located in front of the arrangement rib 59 and are led out to the substrate storage portion 53. Thereafter, the pair of temperature detection lines 41 merge with the pair of voltage detection lines 40, pass through the right side of the curved wall 52D and face forward, and pass through the opening 57A of the partition wall 57 and are led out to the adjacent substrate storage portion 53.

[0046] [Functions and effects of the embodiment] According to the embodiment, the following functions and effects are achieved.

[0047] The wiring module 20 of the embodiment is a wiring module 20 installed on a battery cell group 11G formed by arranging a plurality of battery cells 11 having electrode terminals 11T in the front-rear direction. The wiring module 20 includes a plurality of bus bars 30, a plurality of circuit boards, a plurality of voltage detection lines 40, a protective member 50 that holds the plurality of bus bars 30, the plurality of circuit boards, and the plurality of voltage detection lines 40, and a connector 60 located outside the protective member 50. The bus bar 30 is connected to the electrode terminal 11T, the circuit board is connected to the bus bar 30, one end of the voltage detection line 40 is connected to the circuit board, and the other end of the voltage detection line 40 is connected to the connector 60. Inside the protective member 50, there are provided a main line storage portion 52 for storing a main line M formed by bundling a plurality of voltage detection lines 40 together and a fixing portion 58 for fixing the main line M to the protective member 50. The main line M has a straight portion M1 extending in the front-rear direction and a redundant length portion M2 in which a part of the straight portion M1 is contracted in the front-rear direction. The main line storage portion 52 has a straight arrangement area M1R for arranging the straight portion M1, an outlet 56 for leading the main line M from the inside of the protective member 50 to the outside, and a redundant length arrangement area M2R disposed between the outlet 56 and the fixing portion 58 for arranging the redundant length portion M2.

[0048] When the connector 60 is engaged with the mating connector of an external device, by pulling the connector 60 in the front-rear direction, the redundant length portion M2 extends in the front-rear direction, and the main line M can be pulled out from the outlet 56 to the outside of the protective member 50. Since the main line M pulled out from the outlet 56 functions as a redundant length, it is easy to engage the connector 60 with the mating connector. In addition, after the connector 60 is engaged with the mating connector, by pressing the main line M in the front-rear direction from the outside of the protective member 50, the redundant length portion M2 of the main line M can be stored in the redundant length arrangement area M2R.

[0049] Since the main line M is fixed to the protective member 50 by the fixing portion 58, when the connector 60 is pulled and the main line M is pulled out from the outlet 56, it is possible to prevent the tensile stress from being transmitted to each voltage detection line 40. In addition, when vibration is transmitted from the vehicle 1 to the main line M, since the vibration can be suppressed by the fixing portion 58, the vibration can be suppressed from being transmitted to each voltage detection line 40.

[0050] Since the main line storage portion 52 having the redundant length arrangement area M2R for arranging the redundant length portion M2 of the main line M is provided inside the protective member 50, the connector 60 can be arranged near the outlet 56 outside the protective member 50. In addition, the protruding amount of the connector 60 and the main line M when the connector 60 is pulled and the main line M is pulled out from the outlet 56 can be reduced. That is, it is possible to reduce the protruding amount of the connector 60 and the main line M while providing the redundant length portion M2. Therefore, the space required for arranging the wiring module 20 can be reduced.

[0051] Preferably, the protection member 50 has a bus bar accommodating portion 51 that accommodates a plurality of bus bars 30, and a substrate accommodating portion 53 that is disposed between the main line accommodating portion 52 and the bus bar accommodating portion 51 and accommodates a circuit board. The surplus length portion M2 is in a curved shape bulging in a direction approaching the bus bar accommodating portion 51, and the surplus length laying area M2R is located between the fixing portion 58 and the circuit board.

[0052] The space between the fixing portion 58 and the circuit board can be effectively utilized to set the surplus length laying area M2R. In this way, the substrate accommodating portion 53 and the main line accommodating portion 52 can be made closer to each other, the wiring module 20 can be miniaturized, and thus the energy density of the battery pack can be increased corresponding to the miniaturization of the battery pack.

[0053] Preferably, a plurality of circuit boards are accommodated in the substrate accommodating portion 53, and the surplus length laying area M2R is located between the Nth circuit board and the (N + 1)th circuit board counted from the lead-out port 56 side.

[0054] Even when a plurality of circuit boards are accommodated in the substrate accommodating portion 53, the space between the Nth first circuit board 21 and the (N + 1)th first circuit board 21 can be effectively utilized to set the surplus length laying area M2R.

[0055] Preferably, the above wiring module further includes a temperature detection line 41. The plurality of circuit boards are configured to include a first circuit board 21 connected to the bus bar and a second circuit board 24 on which a temperature measuring element 26 is mounted. A plurality of first circuit boards 21 and second circuit boards 24 are accommodated in the substrate accommodating portion 53. One end of the temperature detection line 41 is connected to the second circuit board 24, and the other end of the temperature detection line 41 is connected to the connector 60. The main line M is formed by bundling a plurality of voltage detection lines 40 and the temperature detection line 41 into one body. On the bottom wall 52A of the main line accommodating portion 52, there is a laying rib 59 protruding in the up-down direction orthogonal to the front-rear direction. The main line M is laid separated from the bottom wall 52A of the main line accommodating portion 52 in the up-down direction by the laying rib 59, and the temperature detection line 41 is laid in the up-down direction between the main line M and the bottom wall 52A of the main line accommodating portion 52.

[0056] When the main line M is pulled out from the inside of the protection member 50 to the outside in a state where both the temperature detection line 41 and the main line M are accommodated in the main line accommodating portion 52, it is possible that the temperature detection line 41 is pulled and dragged by the main line M, and thus a load may be applied to the connection portion between the temperature detection line 41 and the second circuit board 24.

[0057] According to the above structure, since the laying rib 59 is provided on the bottom wall 52A of the main line storage part 52, the main line M is in a state of being placed on the laying rib 59 and is laid at a position far from the bottom wall 52A of the main line storage part 52. On the other hand, since the temperature detection line 41 is laid between the main line M and the bottom wall 52A of the main line storage part 52 in the vertical direction, the temperature detection line 41 can be stored in the main line storage part 52 in a state of not contacting the main line M. Therefore, when the main line M is pulled out from the inside of the protective member 50 to the outside, it is possible to suppress the temperature detection line 41 from being pulled and dragged by the main line M, and thus it is possible to suppress the application of a load to the connection part between the temperature detection line 41 and the second circuit board 24.

[0058] <Other Embodiments> (1) In the above embodiment, the protective member 50 includes the protective member main body 50A and the cover 50B, but it is not limited thereto, and the protective member may also be composed of a single component.

[0059] (2) In the above embodiment, the first circuit board 21 and the second circuit board 24 are flexible circuit boards, but it is not limited thereto, and the first circuit board and the second circuit board may also be rigid circuit boards.

[0060] (3) In the above embodiment, an example is shown in which the slack portion M2 is in a curved shape bulging in a direction approaching the bus bar storage part 51, but the shape of the slack portion is not limited thereto. For example, the slack portion may be in a shape that can expand and contract in the first direction, or may be in a coil shape or a wave shape.

[0061] (4) In the above embodiment, an example is shown in which the temperature detection line 41 is stored in the detection line storage groove 59A, but a part of the temperature detection line 41 may also be stored in the detection line storage groove 59A within a range where it does not contact the main line M.

[0062] (5) In the above embodiment, an example is shown in which the wiring module 20 having only one second circuit board 24 is provided, but it may also be a wiring module provided with a plurality of second circuit boards 24. Description of Reference Numerals

[0063] 1: Vehicle 2: Power Storage Assembly 3: PCU 4: Wiring Harness 10: Power Storage Module 11: Power Storage Element 11G: Power Storage Element Group 11T: Electrode Terminal 15: Metal Chip 20: Wiring Module 21: First Circuit Board (Circuit Board) 22: Substrate Main Body 22A: Wire Connection Pad 23: Protruding Portion 24: Second Circuit Board (Circuit Board) 25: Substrate Main Body 25A: Wire Connection Pad 26: Temperature Measuring Element 30: Bus Bar 30A: Connection Bus Bar 30B: Output Bus Bar 40: Voltage detection line 41: Temperature detection line 50: Protective member 50A: Protective member main body 50B: Cover 51: Bus bar storage part 52: Trunk line storage part 52A: Bottom wall 52B: Side wall 52C: Cutout part 52D: Bending wall 53: Substrate storage part 54: Placing surface 55: Connector storage part 56: Outlet 57: Partition wall 57A: Opening 58: Fixing part 59: Laying rib 59A: Detection line storage groove 60: Connector M: Trunk line M1: Straight part M2: Slack part M1R: Straight laying area M2R: Slack laying area.

Claims

1. A wiring module is installed in a battery cell group formed by arranging a plurality of battery cells having electrode terminals in a first direction, wherein, The wiring module includes: a plurality of bus bars; a plurality of circuit boards; a plurality of voltage detection lines; a protective member that holds the plurality of bus bars, the plurality of circuit boards, and the plurality of voltage detection lines; and a connector located outside the protective member, the bus bar is connected to the electrode terminal, the circuit board is connected to the bus bar, one end of the voltage detection line is connected to the circuit board, and the other end of the voltage detection line is connected to the connector, a main line storage portion and a fixing portion are provided inside the protective member, the main line storage portion stores a main line formed by bundling the plurality of voltage detection lines together, and the fixing portion fixes the main line to the protective member, the main line has a straight portion extending in the first direction and a slack portion that contracts a part of the straight portion in the first direction, the main line storage portion has a straight layout area for laying out the straight portion, an outlet for leading the main line from the inside of the protective member to the outside, and a slack layout area disposed between the outlet and the fixing portion for laying out the slack portion.

2. The wiring module according to claim 1, wherein the protective member has a bus bar storage portion for storing the plurality of bus bars and a substrate storage portion disposed between the main line storage portion and the bus bar storage portion for storing the circuit boards, and the slack portion is in a curved shape bulging in a direction approaching the bus bar storage portion, the slack layout area is located between the fixing portion and the circuit board.

3. The wiring module according to claim 2, wherein the plurality of circuit boards are stored in the substrate storage portion, the slack layout area is located between the Nth circuit board and the (N + 1)th circuit board counted from the outlet side.

4. The wiring module according to claim 3, wherein it further includes a temperature detection line, the plurality of circuit boards are configured to include a first circuit board connected to the bus bar and a second circuit board on which a temperature measuring element is mounted, a plurality of the first circuit boards and the second circuit boards are stored in the substrate storage portion, one end of the temperature detection line is connected to the second circuit board, and the other end of the temperature detection line is connected to the connector, the main line is formed by bundling the plurality of voltage detection lines and the temperature detection line together, a layout rib protruding in a second direction orthogonal to the first direction is provided on the bottom wall of the main line storage portion, the main line is laid out separated from the bottom wall of the main line storage portion in the second direction by the layout rib, and the temperature detection line is laid out between the main line and the bottom wall of the main line storage portion in the second direction.

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