Substrate

Abstract

To provide a substrate used in the low-cost manufacture of wiring modules with voltage detection lines arranged in potential order.SOLUTION: A substrate 21 which is included in a wiring module 20 and in which first voltage detection lines 23 and second voltage detection lines 24 are formed, has flexibility and includes: a first connection piece 25 having one ends of the first voltage detection lines; a second connection piece 26 having one ends of the second voltage detection lines; and the other ends of the first voltage detection lines 23 and the other ends of the second voltage detention lines 24 both electrically connected to a connector 37. The other ends of the first voltage detection lines are arranged in a separating direction in the order of potential of electrode terminals 12 electrically connected through the first voltage detection lines. The other ends of the second voltage detection lines are arranged in the separating direction in the order of potential of electrode terminals electrically connected through the second voltage detection lines. In a connector connection piece, one of the plurality of first voltage detection lines and the plurality of second voltage detection lines are folded back once, and the first voltage detection lines and the second voltage detection lines are connected from the same side in an alignment direction against the connector.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a substrate. [Background technology]

[0002] Conventionally, a wiring module that is attached to a plurality of energy storage elements is known. The wiring module has a plurality of voltage detection lines formed on a flexible substrate. The plurality of voltage detection lines are electrically connected to the electrode terminals of the energy storage elements, respectively. The plurality of voltage detection lines are connected to an apparatus, and the voltage of the energy storage elements is detected by the apparatus. For example, one disclosed in International Publication No. 2014 / 024452 (Patent Document 1 below) is known as such a wiring module. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2014 / 024452 Summary of the Invention [Problem to be solved by the invention]

[0004] In some cases, positive and negative electrode terminals of an energy storage element are formed separately at both ends in the width direction. In addition, when a plurality of energy storage elements are connected in series or in parallel, the potentials of the electrode terminals may differ in a complex manner for each energy storage element. In such a case, in a wiring module attached to a plurality of energy storage elements, the voltage detection lines connected to each electrode terminal may be arranged in an order different from the order of the potentials of the electrode terminals to which the voltage detection lines are connected (see FIG. 4 of Patent Document 1).

[0005] On the other hand, in a device that detects the voltage of a storage element, the terminals of a circuit or a microcomputer that detects the voltage may be arranged in order of potential. In this regard, it may be possible to rearrange the voltage detection lines that are arranged regardless of potential in order of potential.

[0006] In order to arrange the voltage detection lines in order of potential on the flexible substrate, it is conceivable to use, for example, jumper wires, but this method may increase the manufacturing cost of the wiring module due to an increase in the number of parts and complex wiring. [Means for solving the problem]

[0007] The wiring module of the present disclosure is a wiring module attached to a plurality of energy storage elements, in which electrode terminals of the plurality of energy storage elements are arranged in two rows in a direction in which the plurality of energy storage elements are aligned, and the electrode terminals of the two rows are spaced apart in a spacing direction perpendicular to the alignment direction, the wiring module comprising: a single flexible substrate having a plurality of first voltage detection wires and a plurality of second voltage detection wires only on one side thereof; and a connector, in which the substrate has a first connection piece having one end of the first voltage detection wire electrically connected to the electrode terminals constituting one of the two rows of the electrode terminals, a second connection piece having one end of the second voltage detection wire electrically connected to the electrode terminals constituting the other row of the electrode terminals, and the first connection piece electrically connected to the connector. a connector connection piece having the other end of a voltage detection line and the other end of the second voltage detection line, the connector connection piece being arranged between the first connection piece and the second connection piece, the other ends of the first voltage detection lines being arranged in the separation direction in order of the potentials of the electrode terminals electrically connected via the first voltage detection line, and the other ends of the second voltage detection lines being arranged in the separation direction in order of the potentials of the electrode terminals electrically connected via the second voltage detection line, in which one of the multiple first voltage detection lines and the multiple second voltage detection lines is folded back once in the connector connection piece, and the first voltage detection line and the second voltage detection line are connected to the connector from the same side in the arrangement direction. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a wiring module in which voltage detection lines are arranged in order of potential at low cost. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a plan view of the electricity storage module according to the first embodiment. [Diagram 2] FIG. 2 is a plan view of the substrate before being folded at the first and second folding portions. [Diagram 3] FIG. 3 is a plan view of the substrate in a state where it is folded in a mountain shape at the first fold portion. [Figure 4] FIG. 4 is a plan view showing the connection between the substrate and a plurality of energy storage elements. [Diagram 5] FIG. 5 is an enlarged plan view of the substrate showing the folded-back portion of the temperature measuring piece. [Figure 6] FIG. 6 is an enlarged plan view of the electricity storage module showing the periphery of a temperature measuring piece disposed in the middle of a plurality of electricity storage elements. [Figure 7] FIG. 7 is a schematic diagram of a cross section taken along line AA of FIG. [Figure 8] FIG. 8 is a schematic diagram of the connector as seen from behind. [Figure 9] FIG. 9 is a schematic diagram of the connector according to the second embodiment as seen from behind. [Figure 10] FIG. 10 is a plan view of the electricity storage module according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described.

[0011] (1) A wiring module disclosed herein is a wiring module attached to a plurality of energy storage elements, the electrode terminals of which are arranged in two rows in a direction in which the plurality of energy storage elements are aligned, and the electrode terminals in the two rows are spaced apart in a spacing direction perpendicular to the direction of alignment. The wiring module includes a single flexible substrate having a plurality of first voltage detection wires and a plurality of second voltage detection wires on only one side thereof, and a connector. The substrate includes a first connection piece having one end of the first voltage detection wire electrically connected to the electrode terminals in one of the two rows of electrode terminals, a second connection piece having one end of the second voltage detection wire electrically connected to the electrode terminals in the other row, and a second connection piece having one end of the second voltage detection wire electrically connected to the connector. the other ends of the first voltage detection lines and the other ends of the second voltage detection lines are arranged in the spacing direction in order of potentials of the electrode terminals electrically connected via the first voltage detection lines, and the other ends of the second voltage detection lines are arranged in the spacing direction in order of potentials of the electrode terminals electrically connected via the second voltage detection lines, and in the connector connection piece, one of the plurality of first voltage detection lines and the plurality of second voltage detection lines is folded back once, and the first voltage detection line and the second voltage detection line are connected to the connector from the same side in the arrangement direction.

[0012] With this configuration, since the substrate is provided with the multiple first voltage detection lines and the multiple second voltage detection lines on only one side, a flexible substrate having conductive paths formed on only one side can be used as the substrate, thereby reducing the manufacturing cost of the wiring module. Since one of the multiple first voltage detection lines and the multiple second voltage detection lines in the connector connection piece is folded back once, the other ends of the first voltage detection lines and the other ends of the second voltage detection lines can be arranged in the spacing direction in the order of the potentials of the electrode terminals to which they are connected.

[0013] (2) At least one of the first connection piece and the second connection piece may be folded back one or more times.

[0014] (3) Both the first connection piece and the second connection piece may be folded back the same number of times.

[0015] With such a configuration, it may be possible to easily control the shape of the substrate while keeping the manufacturing costs of the substrate down.

[0016] (4) It is preferable that a surface of the substrate on which the other end of the first voltage detection line is arranged and a surface of the substrate on which the other end of the second voltage detection line is arranged are arranged opposite each other.

[0017] With this configuration, the board can be easily mounted on the connector.

[0018] (5) The connector preferably comprises a first terminal connected to the other end of the first voltage detection line and a second terminal connected to the other end of the second voltage detection line, the first terminals being arranged in a row in the separation direction, and the second terminals being arranged at a different position from the first terminals in a direction perpendicular to the arrangement direction and the separation direction, and being arranged in a row in the separation direction.

[0019] With this configuration, the connector can be made smaller in size in the separation direction.

[0020] (6) The connector comprises a first terminal connected to the other end of the first voltage detection line and a second terminal connected to the other end of the second voltage detection line, and it is preferable that the first terminal and the second terminal are arranged in a row in the separation direction, and that the first terminal and the second terminal are arranged alternately in the separation direction and arranged in order of potential.

[0021] With this configuration, the connector can be made smaller in size in the direction perpendicular to the arrangement direction and the spacing direction.

[0022] (7) The above wiring module preferably includes a protector for protecting the substrate.

[0023] With this configuration, the substrate can be protected.

[0024] [Details of the embodiment of the present disclosure] The present disclosure will be described below with reference to the embodiments. The present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0025] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to Figs. 1 to 8. A power storage module 10 including a wiring module 20 of this embodiment is mounted on a vehicle as a power source for driving the vehicle, such as an electric vehicle or a hybrid vehicle. In the following description, the direction indicated by the arrow Z is the upward direction, the direction indicated by the arrow X is the forward direction, and the direction indicated by the arrow Y is the leftward direction. Note that, for multiple identical members, only some of the members may be labeled with reference numerals, and the reference numerals of the other members may be omitted.

[0026] [Energy storage element] As shown in Fig. 1, in an energy storage module 10, a plurality of (12 in this embodiment) energy storage elements 11 are arranged in a front-rear direction (one example of an arrangement direction). The energy storage elements 11 have a rectangular shape. An energy storage element (not shown) is housed inside the energy storage element 11. The energy storage element 11 is not particularly limited, and may be a secondary battery or a capacitor. The energy storage element 11 in this embodiment is a secondary battery.

[0027] [Electrode terminal] As shown in FIG. 1, electrode terminals 12 are formed on both left and right ends of the upper surface of the energy storage element 11. One of the electrode terminals 12 is a positive electrode, and the other is a negative electrode. In the multiple energy storage elements 11, the electrode terminals 12 are arranged in two rows in the front-rear direction, and the two rows of electrode terminals 12 are spaced apart in the left-right direction (an example of a spacing direction). One of the two rows of electrode terminals 12 is a first electrode terminal 12A, and is arranged on the left side of the multiple energy storage elements 11. The other of the two rows of electrode terminals 12 is a second electrode terminal 12B, and is arranged on the right side of the multiple energy storage elements 11. The first electrode terminal 12A is electrically connected to a connection bus bar 13 or an output bus bar 14. The second electrode terminal 12B is electrically connected to the connection bus bar 13.

[0028] The connection busbar 13 and the output busbar 14 are formed by pressing a metal plate into a predetermined shape. Any metal can be selected as the metal constituting the metal plate, such as copper, a copper alloy, aluminum, an aluminum alloy, etc. A plating layer (not shown) may be formed on the surface of the connection busbar 13 and the output busbar 14. Any metal can be selected as the metal constituting the plating layer, such as tin, nickel, solder, etc.

[0029] As shown in FIG. 1 , the connection bus bars 13 are connected to the electrode terminals 12 in a state in which they straddle the electrode terminals 12 adjacent to each other in the front-rear direction. The output bus bar 14 is connected to one electrode terminal 12 to output power to an external device. In this embodiment, there are two output bus bars 14, one connected to the first electrode terminal 12A of the rearmost storage element 11 and the other connected to the first electrode terminal 12A of the foremost storage element 11. In this embodiment, five connection bus bars 13 connect adjacent first electrode terminals 12A, and six connection bus bars 13 connect adjacent second electrode terminals 12B. The multiple storage elements 11 are connected in series by these connection bus bars 13.

[0030] The output bus bars 14 and the connection bus bars 13 can be electrically connected to the electrode terminals 12 by a known method such as soldering, welding, or bolt fastening.

[0031] 1, the numbers 1 to 13 assigned to the connection busbars 13 and the output busbars 14 indicate the order of potential of the electrode terminals 12 of the energy storage elements 11 to which the connection busbars 13 and the output busbars 14 are connected. The electrode terminals 12 connected to the output busbars 14 numbered 1 have the highest potential, and the potentials decrease in the order from 1 to 13, with the electrode terminal 12 connected to the output busbars 14 numbered 13 having the lowest potential.

[0032] 1, the order of potentials of the first electrode terminals 12A connected to the output bus bar 14 and the connection bus bar 13 arranged at the left ends of the multiple storage elements 11 lined up in the front-rear direction is 1, 3, 5, 7, 9, 11, and 13, from highest. The order of potentials of the second electrode terminals 12B connected to the connection bus bar 13 arranged at the right ends of the multiple storage elements 11 is 2, 4, 6, 8, 10, and 12, from highest.

[0033] The energy storage module 10 is connected to an external ECU (Electronic Control Unit) or the like (not shown) via a connector 37. The ECU is equipped with a microcomputer, elements, etc., and has a well-known configuration including functions for detecting the voltage, current, temperature, etc. of each energy storage element 11 and controlling the charging and discharging of each energy storage element 11.

[0034] [Wiring module] 1, a wiring module 20 is placed on the upper surfaces of the multiple energy storage elements 11. The wiring module 20 according to this embodiment includes a flexible substrate 21 having a multiple first voltage detection wires 23 and a multiple second voltage detection wires 24 on only one surface thereof, and a connector 37 to which the substrate 21 is connected.

[0035] As shown in Fig. 2, the substrate 21 is configured by forming a plurality of first voltage detection wires 23 and a plurality of second voltage detection wires 24 only on the front surface 21A of a flexible insulating sheet by printed wiring technology. As shown in Fig. 3, no conductive path is provided on the rear surface 21B of the substrate 21. Note that on the rear surface 21B of the substrate 21, the first voltage detection wires 23 and the second voltage detection wires 24 arranged on the front surface 21A of the substrate 21 are indicated by dashed lines. The substrate 21 of this embodiment is a flexible printed circuit board.

[0036] [First connection piece, second connection piece, connector connection piece] 1, the substrate 21 includes a first connection piece 25 extending in the front-rear direction, a second connection piece 26 extending in the front-rear direction at a left-right interval from the first connection piece 25, and a connector connection piece 27 located between the first connection piece 25 and the second connection piece 26. The substrate 21 has a first folded portion 30A at which the first voltage detection wires 23 are folded back at the first connection piece 25, a second folded portion 30B at which the second voltage detection wires 24 are folded back at the second connection piece 26, and a third folded portion 30C at which the second voltage detection wires 24 are folded back at the connector connection piece 27.

[0037] [First voltage detection wire, second voltage detection wire] As shown in FIG. 1, a plurality (seven in this embodiment) of first voltage detection wires 23 are formed in the first connection piece 25 and the connector connection piece 27, and a plurality (six in this embodiment) of second voltage detection wires 24 are formed in the second connection piece 26 and the connector connection piece 27.

[0038] [One end of the second voltage detection wire] As shown in FIG. 4, the second voltage detection wires 24 extend in the second connection piece 26 generally in the front-rear direction and are arranged at intervals in the left-right direction. The rear end of the second voltage detection wire 24 is one end 24A of the second voltage detection wire 24. The one end 24A of the second voltage detection wire 24 is provided on the right side of the second connection piece 26 at an interval in the front-rear direction and is electrically connected to the connection bus bar 13 connected to the second electrode terminal 12B. The second voltage detection wire 24 and the connection bus bar 13 can be electrically connected by any method such as soldering or welding. In this embodiment, the second voltage detection wire 24 and the connection bus bar 13 are connected via a metal piece 15 such as nickel. The one end 24A of the second voltage detection wire 24 and the metal piece 15 are connected by soldering, and the connection bus bar 13 and the metal piece 15 are connected by welding.

[0039] [One end of the first voltage detection wire] 4, the multiple first voltage detection wires 23 extend generally in the front-rear direction in the first connection piece 25 and are arranged at intervals in the left-right direction. The rear end of the first voltage detection wire 23 is one end 23A of the first voltage detection wire 23. One end 23A of the first voltage detection wire 23 is provided on the left side of the first connection piece 25 at an interval in the front-rear direction, and is connected via a metal piece 15 to the connection bus bar 13 or the output bus bar 14 connected to the first electrode terminal 12A.

[0040] [The other end of the first voltage detection wire, the other end of the second voltage detection wire] 4, the connector connection piece 27 includes the other end 23B of the first voltage detection wire 23, which is the end opposite to one end 23A of the first voltage detection wire 23, and the other end 24B of the second voltage detection wire 24, which is the end opposite to one end 24A of the second voltage detection wire 24. The other end 23B of the first voltage detection wire 23 and the other end 24B of the second voltage detection wire 24 are adapted to be electrically connected to a connector 37 (see FIG. 7). In this embodiment, the first voltage detection wire 23 and the second voltage detection wire 24 are connected to the connector 37 by soldering.

[0041] In the following, the first folded portion 30A, the second folded portion 30B, and the third folded portion 30C of the substrate 21 will be described, and then the arrangement of the multiple first voltage detection lines 23 and the multiple second voltage detection lines 24 will be described. 2 shows the board 21 in a state where none of the first folded portion 30A, the second folded portion 30B, and the third folded portion 30C are folded back. In FIG. 2, the connector connection piece 27 includes a first protruding piece 28 protruding rightward from the first connection piece 25, and a second protruding piece 29 protruding leftward from the second connection piece 26. The first voltage detection wires 23 arranged on the first protruding piece 28 and the second voltage detection wires 24 arranged on the second protruding piece 29 extend generally in the left-right direction and are arranged perpendicular to the direction in which the first voltage detection wires 23 arranged on the first connection piece 25 and the second voltage detection wires 24 arranged on the second connection piece 26 extend (front-rear direction). The other end 23B of the first voltage detection wire 23 is arranged on the right end of the first protruding piece 28. The other end 24B of the second voltage detection wire 24 is disposed at the left end of the second protruding piece 29.

[0042] As shown in Fig. 2, a first folded portion 30A is provided across the entire width of the first connection piece 25 in the left-right direction in a portion of the first connection piece 25 close to the connector connection piece 27. The first folded portion 30A is a fold that forms an angle of 45° with respect to the direction in which the first connection piece 25 extends. The first connection piece 25 is mountain-folded at the first folded portion 30A (see Figs. 2 and 3). Here, mountain folding refers to folding the first connection piece 25 back so that the fold is on the outside of the first connection piece 25 that is being folded back.

[0043] FIG. 3 shows the substrate 21 in a state where it is folded back at the first folded back portion 30A. In FIG. 3, the second folded back portion 30B is provided in a portion of the second connection piece 26 close to the connector connection piece 27 across the entire width of the second connection piece 26 in the front-rear direction. The second folded back portion 30B is a fold that forms an angle of 45° with respect to the direction in which the second connection piece 26 extends. The second connection piece 26 is valley folded at the second folded back portion 30B (see FIG. 3 and FIG. 4). Here, the valley fold means that the second connection piece 26 is folded back so that the fold is on the inside of the second connection piece 26 to be folded. Note that the second folded back portion 30B is a mountain fold when comparing FIG. 2 with FIG. 4.

[0044] Fig. 4 shows the substrate 21 in a state where it is folded back at the first fold portion 30A and the second fold portion 30B. In Fig. 4, the connector connection piece 27 is provided with a third fold portion 30C across the entire width of the connector connection piece 27 in the left-right direction. The third fold portion 30C is a fold that forms an angle of 90° with respect to the direction in which the connector connection piece 27 extends (front-rear direction). The connector connection piece 27 is mountain-folded at the third fold portion 30C (see Figs. 1 and 4). By folding the connector connection piece 27 back at the third fold portion 30C, the first protrusion piece 28 and the second protrusion piece 29 are arranged to overlap in the up-down direction (see Fig. 7).

[0045] 4, the first voltage detection wires 23 are folded back at the first folded-back portion 30A, and the first voltage detection wires 23 are folded back once as a whole. As a result, one end 23A of the first voltage detection wires 23 is disposed on the upper surface (the front side in the direction perpendicular to the paper surface) of the first connection piece 25, whereas the other end 23B of the first voltage detection wires 23 is disposed on the lower surface (the rear side in the direction perpendicular to the paper surface) of the first protruding piece 28. In addition, the first folded-back portion 30A is a fold that forms an angle of 45° with respect to the extending direction of the first connection piece 25, so that the extending direction of the first voltage detection wires 23 at the first connection piece 25 on the rear side of the first folded-back portion 30A and the extending direction of the first voltage detection wires 23 at the first protruding piece 28 are both approximately in the front-rear direction.

[0046] As shown in FIG. 4, in a state where the second voltage detection wires 24 are folded back only at the second folding back portion 30B, one end 24A of the second voltage detection wire 24 is disposed on the upper surface (the front side in the direction perpendicular to the paper surface) of the second connection piece 26, whereas the other end 24B of the second voltage detection wire 24 is disposed on the lower surface (the rear side in the direction perpendicular to the paper surface) of the second protruding piece 29. As shown in FIG. 1, in a state where the second voltage detection wires 24 are folded back at the second folding back portion 30B and the third folding back portion 30C, the second voltage detection wires 24 are folded back once more from the state shown in FIG. 4. Therefore, as shown in FIG. 7, the other end 24B of the second voltage detection wire 24 is disposed on the upper surface of the second protruding piece 29. Also, as shown in FIG. 4, the second folded portion 30B is a fold that forms an angle of 45° with respect to the direction in which the second connection piece 26 extends, so that the extension direction of the second voltage detection wire 24 at the second connection piece 26 rearward of the second folded portion 30B and the extension direction of the second voltage detection wire 24 at the second protrusion 29 are both roughly in the front-to-rear direction.

[0047] In Fig. 4, the numbers attached to the other ends 23B of the first voltage detection wires 23 indicate the potential of the connection bus bar 13 or the output bus bar 14 (first electrode terminal 12A) to which the respective first voltage detection wires 23 are connected. The other ends 23B of the first voltage detection wires 23 are arranged closely together from the right end of the first protruding piece 28, and are arranged side by side in the left-right direction in the order of 1, 3, 5, 7, 9, 11, 13 in order of decreasing potential toward the left. The potential of the first voltage detection wire 23 labeled 13 is the lowest compared to the potentials of the other first voltage detection wires 23 and the second voltage detection wire 24. The potential of the first voltage detection wire 23 labeled 13 is a reference potential in the energy storage module 10 according to this embodiment, and may be 0V. When the energy storage module 10 of this embodiment is connected in series with another energy storage module 10, the potential of the first voltage detection line 23 labeled 13 may be greater than 0 V since it is based on the relative potential difference with the other energy storage module 10.

[0048] 4, the numbers assigned to the other ends 24B of the second voltage detection wires 24 indicate the potential of the connection bus bar 13 (second electrode terminal 12B) to which each second voltage detection wire 24 is connected. The other ends 24B of the second voltage detection wires 24 are arranged side by side in the left-right direction in the order of decreasing potential, that is, 2, 4, 6, 8, 10, and 12, moving leftward.

[0049] [Multiple thermistor circuits] 4, the substrate 21 of this embodiment further includes a plurality of thermistor circuits 31 (three in this embodiment) as conductive paths other than the first voltage detection wire 23 and the second voltage detection wire 24. The plurality of thermistor circuits 31 are circuits for measuring the temperature of the energy storage elements 11, and, like the first voltage detection wire 23 and the second voltage detection wire 24, are formed by printed wiring technology only on the front surface 21A of the substrate 21. The plurality of thermistor circuits 31 are arranged to the right of the first connection piece 25 and to the left of the first protrusion 28.

[0050] 6, the thermistor circuit 31 includes a thermistor 32, a ground conductive path 33 leading from the thermistor 32 to a common ground potential, and a temperature measurement conductive path 34 leading from the thermistor 32 and different from the ground conductive path 33. As shown in FIG 4, the front end of the ground conductive path 33 is one end 31A of the thermistor circuit 31, and the front end of the temperature measurement conductive path 34 is the other end 31B of the thermistor circuit 31.

[0051] As shown in FIG. 4, a part of the circuit including the thermistor 32 in the thermistor circuit 31 is disposed in a temperature measuring piece 35 provided in the first connection piece 25. The temperature measuring piece 35 is provided in the rear part, the front part, and the intermediate part between them of the first connection piece 25. The temperature measuring piece 35 is formed by making a cut in the first connection piece 25, and is folded back toward the left-right central part of the energy storage element 11. As shown in FIG. 5 and FIG. 6, in detail, the temperature measuring piece 35 has two temperature measuring piece folded parts 36A, 36B, and is folded in a valley at the temperature measuring piece folded part 36A and folded in a mountain at the temperature measuring piece folded part 36B. With this configuration, as shown in FIG. 4, the temperature near the left-right central part of the upper surface of the energy storage element 11 arranged in the frontmost part, the rearmost part, and the intermediate part of the energy storage element 11 can be measured by the multiple thermistor circuits 31.

[0052] As shown in FIG. 4, the multiple thermistor circuits 31 are arranged on the substrate 21 generally parallel to the multiple first voltage detection lines 23, and are folded back at the first folded back portion 30A in the same manner as the multiple first voltage detection lines 23. One end 31A of the thermistor circuit 31 connected to the ground potential is arranged at the left end of the first protruding piece 28. The one end 31A of the thermistor circuit 31 is marked with a symbol GND (G in FIG. 8) indicating the ground potential. The potential of the one end 31A of the thermistor circuit 31 is the ground potential, i.e., 0V. The other end 31B of the thermistor circuit 31 is arranged to the right of the one end 31A of the thermistor circuit 31. The other ends 31B of the thermistor circuit 31 are marked with symbols C, B, and A from the left, and correspond to the thermistors 32 arranged at the front, middle, and rearmost parts of the multiple storage elements 11, respectively. The potential of the other end 31B of the thermistor circuit 31 is determined based on the resistance value of the thermistor 32.

[0053] 4, in the first protruding piece 28, the other ends 31B of the multiple thermistor circuits 31 labeled A, B, and C are disposed between one end 31A (ground potential) of the thermistor circuit 31 labeled GND and the other end 23B of the first voltage detection line 23 having the lowest potential labeled 13. Since the other end 31B of the thermistor circuit 31 and the other end 23B of the first voltage detection line 23 having the lowest potential are at a relatively close potential, a short circuit between the thermistor circuit 31 and the first voltage detection line 23 can be suppressed.

[0054] [connector] 7, the first protrusion 28 and the second protrusion 29 are connected to the connector 37 from the rear side (an example of the same side in the arrangement direction). The surface (surface 21A) of the first protrusion 28 on which the other end 23B of the first voltage detection wire 23 is formed and the surface (surface 21A) of the second protrusion 29 on which the other end 24B of the second voltage detection wire 24 is formed are arranged to face each other in the up-down direction.

[0055] As shown in FIG. 7, the connector 37 of this embodiment is a connector for a flexible printed circuit board, and includes a first terminal 38 connected to the first protruding piece 28, a second terminal 39 connected to the second protruding piece 29, and a housing 42 that accommodates the first terminal 38 and the second terminal 39. In this embodiment, the first terminal 38 and the second terminal 39 are female terminals. The first terminal 38 and the second terminal 39 include a connection tube portion 40 that is connected to a male terminal of a mating connector (not shown), and a board connection portion 41 that is connected to the rear of the connection tube portion 40. The board connection portion 41 of the first terminal 38 is connected to the other end 23B of the first voltage detection wire 23, one end 31A of the thermistor circuit 31, or the other end 31B of the thermistor circuit 31 by soldering. The board connection portion 41 of the second terminal 39 is connected to the other end 24B of the second voltage detection wire 24 by soldering.

[0056] 7, the housing 42 includes an upper housing 43 and a lower housing 45, which are separate bodies, and an intermediate housing 44 disposed therebetween. The upper housing 43 constitutes the upper outer surface of the housing 42, and the lower housing 45 constitutes the lower outer surface of the housing 42. The intermediate housing 44 locks the first terminal 38 and the second terminal 39 inside the housing 42 to prevent them from coming off. Although a detailed description is omitted, the connector 37 can be constructed, for example, by stacking and assembling the upper housing 43, the first protruding piece 28 to which the first terminal 38 has been soldered in advance, the intermediate housing 44, the second protruding piece 29 to which the second terminal 39 has been soldered in advance, and the lower housing 45 in the vertical direction.

[0057] Fig. 8 is a rear view of connector 37, showing a schematic arrangement of first terminals 38 and second terminals 39 in connector 37. Numbers 1 to 13 attached inside the rectangular frames showing first terminals 38 and second terminals 39 indicate the order of potentials of first terminals 38 or second terminals 39, and correspond to the numbers attached to connection bus bars 13 or output bus bars 14 in Fig. 1. Similarly, the symbols G, C, B, and A attached to first terminal 38 in Fig. 8 correspond to the symbols GND, C, B, and A attached to one end 31A of the thermistor circuit 31 and the other end 31B of the thermistor circuit 31 in Fig. 4.

[0058] 8, the first terminals 38 are arranged in a row in the left-right direction on the upper side of the connector 37 in the order of potential. The second terminals 39 are arranged in a row in the left-right direction on the lower side of the connector 37 in the order of potential. In this way, the first terminals 38 and the second terminals 39 are arranged offset in the up-down direction (one example of a direction perpendicular to the arrangement direction and the spacing direction) and the connector 37 is made two-tiered, whereby the connector 37 can be made smaller in the left-right direction. In particular, when the number of energy storage elements 11 to which the wiring module 20 is applied is large, the number of first voltage detection wires 23 and second voltage detection wires 24 will be large, and therefore a two-tier configuration like the connector 37 may be preferable.

[0059] 8, a second terminal 39 connected to an intermediate potential between adjacent first terminals 38 in the left-right direction is disposed in the middle between these terminals. For example, a second terminal 39 labeled 6 is disposed in the middle between first terminals 38 labeled 5 and 7 in the left-right direction. By disposing the first terminals 38 and the second terminals 39 with a shift in the left-right direction in this manner, the first terminals 38 and the second terminals 39 can be arranged in a zigzag pattern in the left-right direction in the entire connector 37 (i.e., the upper and lower rows combined) in the order of potential.

[0060] 8, the first terminals 38 and the second terminals 39 may be arranged at the same positions in the left-right direction (not shown). For example, the first terminals 38 numbered 1 and the second terminals 39 numbered 2 may be arranged at the same position in the left-right direction, and the first terminals 38 numbered 3 and the second terminals 39 numbered 4 may be arranged at the same position in the left-right direction.

[0061] [Effects of embodiment 1] According to the first embodiment, the following actions and effects are achieved. The wiring module 20 according to the first embodiment is a wiring module 20 attached to a plurality of energy storage elements 11 in which electrode terminals 12 of the plurality of energy storage elements 11 are arranged in two rows in the front-rear direction, and the two rows of electrode terminals 12 are spaced apart in the left-right direction. The wiring module 20 includes a single substrate 21 that is flexible and has a plurality of first voltage detection wires 23 and a plurality of second voltage detection wires 24 on only one side thereof, and a connector 37. The substrate 21 includes a first connection piece 25 having one end 23A of the first voltage detection wire 23 electrically connected to a first electrode terminal 12A constituting one of the two rows of electrode terminals 12, and a second connection piece 26 having one end 24A of the second voltage detection wire 24 electrically connected to a second electrode terminal 12B constituting the other row. , the other end 23B of the first voltage detection wire 23 and the other end 24B of the second voltage detection wire 24 are electrically connected to the connector 37, and a connector connection piece 27 is arranged between the first connection piece 25 and the second connection piece 26, the other ends 23B of the first voltage detection wires 23 are arranged in the left-right direction in order of the potential of the first electrode terminals 12A electrically connected via the first voltage detection wires 23, and the other ends 24B of the second voltage detection wires 24 are arranged in the left-right direction in order of the potential of the second electrode terminals 12B electrically connected via the second voltage detection wires 24, and in the connector connection piece 27, the multiple second voltage detection wires 24 are folded back once, and the first voltage detection wires 23 and the second voltage detection wires 24 are connected to the connector 37 from the rear side.

[0062] According to the above configuration, since the substrate 21 has the multiple first voltage detection wires 23 and the multiple second voltage detection wires 24 on only one side, a flexible substrate (flexible printed circuit board) having conductive paths formed on only one side can be used as the substrate 21, thereby reducing the manufacturing cost of the wiring module 20. Since the multiple second voltage detection wires 24 are folded back once in the connector connection piece 27, the other ends 23B of the first voltage detection wires 23 and the other ends 24B of the second voltage detection wires 24 can be arranged in the left-right direction in the order of the potentials of the electrode terminals 12 to which they are connected.

[0063] In the first embodiment, both the first connection piece 25 and the second connection piece 26 are folded back once (excluding the folding back of the substrate 21 at the temperature measuring piece fold-back portions 36A and 36B).

[0064] In the wiring module 20, the board 21 includes a first connection piece 25 and a second connection piece 26 that extend rearward from the connector connection piece 27 and are spaced apart in the left-right direction, and has an overall shape with many projections and recesses. If the first connection piece and the second connection piece were configured without the first folded portion and the second folded portion, respectively, the number of boards to be cut when punching out a board with many projections and recesses from a fixed length would be reduced. On the other hand, in the wiring module 20 of the first embodiment, both the first connection piece 25 and the second connection piece 26 are folded back once. And, since the board 21 in a state where it is not folded back (see FIG. 2) has a shape with relatively few projections and recesses, it is possible to increase the number of boards 21 to be cut out when punching out a board 21 that is not folded back from a fixed length. Therefore, according to the above configuration, it is easy to control the shape of the board 21 while suppressing the manufacturing cost of the board 21.

[0065] In the first embodiment, the surface of the substrate 21 on which the other end 23B of the first voltage detection wire 23 is arranged and the surface of the substrate 21 on which the other end 24B of the second voltage detection wire 24 is arranged are arranged to face each other.

[0066] According to the above configuration, the board 21 can be easily mounted on the connector 37.

[0067] In embodiment 1, the connector 37 includes a first terminal 38 connected to the other end 23B of the first voltage detection line 23 and a second terminal 39 connected to the other end 24B of the second voltage detection line 24, the first terminals 38 being arranged in a row in the left-right direction, and the second terminals 39 being arranged in a row in the left-right direction at a position different from the first terminals 38 in the up-down direction.

[0068] According to the above configuration, the connector 37 can be made smaller in size in the left-right direction.

[0069] <Embodiment 2> A second embodiment of the present disclosure will be described with reference to Fig. 9. The configuration of the second embodiment is similar to that of the first embodiment, except that the connector 137 is a single-stage type. Hereinafter, the same members as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the same configurations, functions, and effects as those in the first embodiment will not be described.

[0070] FIG. 9 is a rear view of the connector 137 according to the second embodiment, illustrating the arrangement of the first terminal 38 and the second terminal 39 in the connector 137. Unlike the connector 37 of the first embodiment (see FIGS. 7 and 8), the connector 137 is configured with the first terminal 38 and the second terminal 39 arranged in a row in the left-right direction. That is, the connector 137 is a single-stage type. By adopting the single-stage arrangement, the connector 137 can be made smaller in size in the up-down direction. In particular, when the number of energy storage elements 11 to which the wiring module 20 is applied is small, the number of first voltage detection wires 23 and second voltage detection wires 24 is small, and therefore, a single-stage configuration like the connector 137 may be adopted.

[0071] 9, in the connector 137, the first terminals 38 and the second terminals 39 are alternately arranged in the left-right direction, and the first terminals 38 and the second terminals 39 are arranged in order of potential in the left-right direction. That is, the first terminals 38 and the second terminals 39 are arranged in order of decreasing potential as they move leftward, i.e. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.

[0072] [Effects of the second embodiment] According to the second embodiment, the following actions and effects are achieved. In embodiment 2, the connector 137 includes a first terminal 38 connected to the other end 23B of the first voltage detection line 23 and a second terminal 39 connected to the other end 24B of the second voltage detection line 24, the first terminal 38 and the second terminal 39 being arranged in a row in the left-right direction, and the first terminals 38 and the second terminals 39 being arranged alternately in the left-right direction and in order of potential.

[0073] According to the above configuration, the connector 137 can be made smaller in size in the vertical direction.

[0074] <Embodiment 3> A third embodiment of the present disclosure will be described with reference to Fig. 10. The wiring module 120 of the power storage module 110 according to the third embodiment is configured similarly to the wiring module 20 according to the first embodiment, except that a protector 50 is provided. Hereinafter, the same members as those in the first embodiment are given the same reference numerals as those in the first embodiment, and descriptions of the same configurations, functions, and effects as those in the first embodiment will be omitted.

[0075] 10, the protector 50 is a plate-shaped member made of insulating synthetic resin. The protector 50 is configured to hold the board 21 and the connector 37. Although the manner in which the protector 50 holds the board 21 and the connector 37 is not shown, for example, fixing with an adhesive, locking with a locking structure, etc. can be adopted.

[0076] Since the wiring module 120 includes the protector 50, each component can be protected. In the configuration of the first embodiment without the protector 50, as shown in FIG. 1, the portion of the substrate 21 that extends forward beyond the multiple energy storage elements 11 (hereinafter referred to as the extension portion 22) is exposed to the outside and is therefore particularly susceptible to damage when an external force is applied thereto. However, in the second embodiment, as shown in FIG. 10, the extension portion 22 is protected by the protector 50 and is not exposed to the outside. Therefore, damage to the extension portion 22 due to an external force can be suppressed. Furthermore, the provision of the protector 50 also facilitates the assembly and transportation of the wiring module 120.

[0077] [Effects of the Third Embodiment] According to the third embodiment, the following actions and effects are achieved. The wiring module 120 according to the third embodiment includes a protector 50 that protects the substrate 21.

[0078] According to the above configuration, the substrate 21 can be protected.

[0079] <Other embodiments> (1) In the above embodiment, the first terminal 38 and the second terminal 39 are female terminals, but this is not limited thereto, and the first terminal and the second terminal may be male terminals. (2) In the above embodiment, both the first connection piece 25 and the second connection piece 26 were folded over, but this is not limited to this, and at least one of the first connection piece and the second connection piece may not be folded over. (3) In the above embodiment, the surface on which the other end 23B of the first voltage detection wire 23 in the first protrusion 28 is arranged (surface 21A of the first protrusion 28) and the surface on which the other end 24B of the second voltage detection wire 24 in the second protrusion 29 is arranged (surface 21A of the second protrusion 29) are opposed to each other, but this is not limited to this, and the back surface of the first protrusion and the back surface of the second protrusion may be opposed to each other. (4) In the above embodiment, the thermistor circuit 31 is provided, but this is not limited thereto, and the thermistor circuit does not necessarily have to be provided. (5) In the above embodiment, the connector 37, 137 is configured to be assembled by stacking the separate upper housing 43, middle housing 44, and lower housing 45, the first protrusion 28 to which the first terminal 38 is connected, and the second protrusion 29 to which the second terminal 39 is connected, but this is not limited to the above. For example, the first terminal and the second terminal may be assembled to an integrally molded housing to configure the connector, and then the connector may be mounted on the first protrusion and the second protrusion. (6) In the above embodiment, a reinforcing plate was not attached to the surface of the first protrusion 28 opposite the surface to which the first terminal 38 is connected (rear surface 21B of the first protrusion 28) and the surface of the second protrusion 29 opposite the surface to which the second terminal 39 is connected (rear surface 21B of the second protrusion 29). However, this is not limited to this, and a reinforcing plate may be attached to the rear surface of the first protrusion and the rear surface of the second protrusion. (7) In the above embodiment, the substrate 21 is a flexible printed circuit board, but this is not limited thereto, and the substrate may be a flexible flat cable. [Explanation of symbols]

[0080] 10,110: Energy storage module 11: Energy storage element 12: Electrode terminal 12A: 1st electrode terminal 12B: 2nd electrode terminal 13: Connection busbar 14: Output busbar 15: Small metal piece 20,120: Wiring module 21: Circuit Board 21A: Surface 21B: Back side 22: Extension 23: First voltage detection wire 23A: One end 23B: other end 24: Second voltage detection wire 24A: One end 24B: Other end 25: First connecting piece 26: Second connecting piece 27: Connector piece 28: First protrusion 29: Second prong 30A: First folded part 30B: Second folded part 30C: Third fold 31: Thermistor circuit 31A: One end 31B: other end 32: Thermistor 33: Ground conductive path 34: Temperature measuring conductive path 35: Temperature measurement piece 36A, 36B: Temperature measuring piece folded back part 37,137: Connector 38: 1st terminal 39: 2nd terminal 40: Connection tube 41: Board connection part 42: Housing 43: Upper housing 44: Intermediate housing 45: Lower housing 50: Protector

Claims

1. A substrate provided in a wiring module attached to a plurality of energy storage elements, the electrode terminals of the plurality of energy storage elements being arranged in two rows in a direction in which the plurality of energy storage elements are arranged, the electrode terminals in the two rows being spaced apart in a spacing direction perpendicular to the direction in which the plurality of energy storage elements are arranged, the substrate is a single substrate having flexibility and having a plurality of first voltage detection lines and a plurality of second voltage detection lines formed on only one side thereof; the substrate comprises: a first connection piece having one end of the first voltage detection line electrically connected to the electrode terminals in one of the two rows of the electrode terminals; a second connection piece having one end of the second voltage detection line electrically connected to the electrode terminals in the other row; and a connector connection piece having the other end of the first voltage detection line and the other end of the second voltage detection line electrically connected to a connector, the connector connection piece being disposed between the first connection piece and the second connection piece; the other ends of the first voltage detection lines are arranged in the spacing direction in order of potential of the electrode terminals electrically connected via the first voltage detection lines, the other ends of the second voltage detection lines are arranged in the spacing direction in order of potential of the electrode terminals electrically connected via the second voltage detection lines, In the connector connection piece, one of the plurality of first voltage detection lines and the plurality of second voltage detection lines is folded back once, A substrate, wherein the first voltage detection line and the second voltage detection line are connected to the connector from the same side in the arrangement direction.

2. The substrate according to claim 1 , further comprising a thermistor circuit for measuring a temperature of the power storage element formed on only said one surface.

3. 3. The substrate according to claim 2, wherein the thermistor circuit comprises: a thermistor; a ground conductive path leading from the thermistor to a ground potential; and a temperature measurement conductive path leading from the thermistor and different from the ground conductive path.

4. 4. The substrate according to claim 3, wherein the ground conductive path is a single ground conductive path extending from the plurality of thermistors to a common ground potential.

5. A part of the thermistor circuit is disposed in a temperature measuring piece, The substrate according to claim 2 , wherein the temperature measuring piece extends toward a center portion in a direction perpendicular to an arrangement direction of the energy storage elements.

6. one end of the thermistor circuit is connected to the ground potential at the connector connecting piece, the other end of the thermistor circuit is arranged adjacent to the other end of the first voltage detection line in the connector connection piece, 5. The substrate according to claim 3, wherein the other end of the thermistor circuit is disposed between one end of the thermistor circuit and the other end of the first voltage detection line having the lowest potential.

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