Wiring Module

Abstract

To provide a wiring module in which a voltage detection wire is arranged in a potential order in a low cost.SOLUTION: A wiring module 20 is a wiring module 20 which is arranged in two lines so that an electrode terminal 12 of a plurality of power storage elements 11 is continuously arranged in an arrangement direction of the plurality of power storage elements 11, and is attached to the power storage elements 11 separated to a separation direction orthogonal to the arrangement direction, and comprises: first and second substrates 21 and 22 having a flexibility and a plurality of voltage detection wires only in a one surface; and a connector 37. The plurality of voltage detection wires 23 is folded in an odd number, and one end of a first voltage detection wire 23 is electrically connected to the electrode terminal 12 forming one line of the two lines of the electrode terminal 12. The other end of the first voltage detection wire 23 is arranged to the separation direction in a potential order of the electrode terminal 12 electrically connected via the first voltage detection wire 23 electrically connected to the connector 37. A plurality of second voltage detection wires 24 is not folded or folded in an even number.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a wiring module. [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 case, 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. However, this method may increase the manufacturing cost of the wiring module due to an increase in the number of parts and the complexity of the 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, 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 comprising: a first substrate having flexibility and including a plurality of first voltage detection lines on only one side; a second substrate having flexibility and including a plurality of second voltage detection lines on only one side; and a connector, the plurality of first voltage detection lines being folded back an odd number of times, one end of the first voltage detection lines being electrically connected to the electrode terminals in one of the two rows of the electrode terminals, and the other end of the first voltage detection lines being connected to the front the electrode terminals electrically connected via the first voltage detection line are arranged in the spacing direction in order of potential and are electrically connected to the connector, the plurality of second voltage detection lines are not folded back or are folded back an even number of times, one end of the second voltage detection line is electrically connected to the electrode terminal in the other row, and the other end of the second voltage detection line is arranged in the spacing direction in order of potential of the electrode terminals electrically connected via the second voltage detection line and is electrically connected to the connector, 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 second substrate before being folded back at the second folding portion. [Diagram 3] FIG. 3 is a plan view of the second substrate in a state where it is folded at one second folded portion. [Figure 4] FIG. 4 is a plan view showing the connection between the second substrate and a plurality of energy storage elements. [Diagram 5] FIG. 5 is a plan view of the first substrate before being folded back at the first folding portion. [Figure 6] FIG. 6 is a plan view showing the connection between the first substrate and a plurality of energy storage elements. [Figure 7] FIG. 7 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 8] FIG. 8 is a schematic diagram of a cross section taken along line AA of FIG. [Figure 9] FIG. 9 is a schematic diagram of the connector as seen from behind. [Figure 10] FIG. 10 is a schematic diagram of the connector according to the second embodiment as seen from behind. [Figure 11] FIG. 11 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 first substrate having flexibility and including a plurality of first voltage detection lines on only one side thereof, a second substrate having flexibility and including a plurality of second voltage detection lines on only one side thereof, and a connector, the plurality of first voltage detection lines are folded back an odd number of times, one end of the first voltage detection line is electrically connected to the electrode terminals in one of the two rows of the electrode terminals, and the first voltage detection lines are connected to each other. The other ends of the lines are arranged in the spacing direction in the order of the potentials of the electrode terminals electrically connected via the first voltage detection line and are electrically connected to the connector, the multiple second voltage detection lines are not folded back or are folded back an even number of times, one end of the second voltage detection line is electrically connected to the electrode terminals in the other row, the other ends of the second voltage detection lines are arranged in the spacing direction in the order of the potentials of the electrode terminals electrically connected via the second voltage detection line and are electrically connected to the connector, 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] According to this configuration, since the first substrate has a plurality of first voltage detection lines on only one side and the second substrate has a plurality of second voltage detection lines on only one side, flexible substrates having conductive paths formed on only one side can be used as the first substrate and the second substrate, thereby reducing the manufacturing cost of the wiring module. Since the plurality of first voltage detection lines are folded back an odd number of times and the plurality of second voltage detection lines are not folded back or are folded back an even number of times, 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) It is preferable that a surface of the first substrate on which the other end of the first voltage detection line is arranged and a surface of the second substrate on which the other end of the second voltage detection line is arranged are arranged opposite each other.

[0014] With this configuration, the first and second boards can be easily mounted on the connector.

[0015] (3) It is preferable that the first substrate has a plurality of thermistor circuits on a surface on which the first voltage detection line is arranged, one end of the plurality of thermistor circuits being connected to a common ground potential and the other end of the plurality of thermistor circuits being connected to the connector and arranged between the ground potential and the other end of the first voltage detection line connected to the electrode terminal having the lowest potential.

[0016] With this configuration, the multiple thermistor circuits are arranged on the same surface as the first voltage detection line, so that a flexible substrate having conductive paths formed on only one surface can be used as the first substrate, thereby reducing the manufacturing cost of the wiring module. Also, the potential of the other end of the multiple thermistor circuits is relatively close to the potential of the first voltage detection line, which has the lowest potential, so that short circuits between the multiple thermistor circuits and the first voltage detection line can be suppressed.

[0017] (4) 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 the opposing direction of the first substrate and the second substrate, and being arranged in a row in the separation direction.

[0018] With this configuration, the connector can be made smaller in size in the separation direction.

[0019] (5) The connector includes 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 the first terminal and the second terminal are arranged in a row in the separation direction, and it is preferable that the first terminal and the second terminal are arranged alternately in the separation direction and arranged in order of potential.

[0020] With this configuration, the connector can be made smaller in size in the opposing direction of the first and second boards.

[0021] (6) The above-mentioned wiring module preferably includes a protector that protects the first substrate and the second substrate.

[0022] With this configuration, the first substrate and the second substrate can be protected.

[0023] [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.

[0024] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to Figs. 1 to 9. 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.

[0025] [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.

[0026] [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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] [Wiring module] 1, a wiring module 20 is placed on the upper surface of the multiple energy storage elements 11. The wiring module 20 according to this embodiment includes a first substrate 21 that is flexible and has multiple first voltage detection wires 23 on only one surface, a second substrate 22 that is flexible and has multiple second voltage detection wires 24 on only one surface, and a connector 37 to which the first substrate 21 and the second substrate 22 are connected. In the following, of the configurations of the first substrate 21 and the second substrate 22, which are substantially similar, the configuration of the second substrate 22, which is simpler, will be described first, and then the configuration of the first substrate 21 will be described.

[0034] [Second board] As shown in Fig. 2, the second substrate 22 is configured by forming a plurality of second voltage detection lines 24 only on the front surface 22A of a flexible insulating sheet by printed wiring technology. As shown in Fig. 3, no conductive path is provided on the rear surface 22B of the second substrate 22. Note that on the rear surface 22B of the second substrate 22, the second voltage detection lines 24 arranged on the front surface 22A of the second substrate 22 are indicated by dashed lines (the same applies to the first substrate 21). The second substrate 22 of this embodiment is a flexible printed substrate.

[0035] [Second voltage detection wire, one end of the second voltage detection wire] As shown in FIG. 4, a plurality of (six in this embodiment) second voltage detection wires 24 are formed on the second substrate 22. One end 24A of the second voltage detection wire 24 is the rear end of the second voltage detection wire 24. One end 24A of the second voltage detection wire 24 is arranged on the right side of the second substrate 22 with a gap 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. 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.

[0036] [The other end of the second voltage detection wire] 4, the front end of the second voltage detection line 24 is the other end 24B of the second voltage detection line 24. The other end 24B of the second voltage detection line 24 is adapted to be electrically connected to a connector 37 (see FIG. 8). In this embodiment, the second voltage detection line 24 and the connector 37 are connected by soldering.

[0037] 4, second substrate 22 has an elongated shape in the front-rear direction as a whole, and includes routing portion 25 extending in the front-rear direction, connector mounting portion 26 disposed at the front end portion of second substrate 22, and second folded portions 27A, 27B at which multiple second voltage detection wires 24 are folded back. Most of routing portion 25 is placed on the upper surfaces of multiple energy storage elements 11, and includes one end 24A of second voltage detection wire 24 that is connected to second electrode terminal 12B of second voltage detection wire 24. In routing portion 25 behind second folded portions 27A, 27B, multiple second voltage detection wires 24 extend roughly in the front-rear direction and are arranged at intervals in the left-right direction.

[0038] In the second substrate 22 not folded back at the second fold-back portions 27A, 27B shown in Fig. 2, the connector mounting portion 26 is disposed at an end of the wiring portion 25 and is provided in a convex shape so as to protrude from the wiring portion 25. In Fig. 2, the multiple second voltage detection wires 24 disposed in the connector mounting portion 26 extend generally in the left-right direction and are arranged at intervals in the front-rear direction. The other end 24B of the second voltage detection wire 24 is disposed at the right end of the connector mounting portion 26.

[0039] As shown in FIG. 2, two second folded portions 27A and 27B are provided in a portion of the wiring portion 25 near the connector mounting portion 26 across the entire width of the wiring portion 25 in the left-right direction. The second folded portion 27A is a fold that forms an angle of 90° with respect to the direction in which the wiring portion 25 extends, and the second folded portion 27B is a fold that forms an angle of 45° with respect to the direction in which the wiring portion 25 extends. The wiring portion 25 is mountain-folded at the second folded portion 27A (see FIGS. 2 and 3) and valley-folded at the second folded portion 27B (see FIGS. 3 and 4). Here, the mountain fold refers to folding the wiring portion 25 so that the fold is on the outside of the wiring portion 25 to be folded, and the valley fold refers to folding the wiring portion 25 so that the fold is on the inside of the wiring portion 25 to be folded.

[0040] 4, the second voltage detection wires 24 are folded back at two second folded back portions 27A and 27B, and the second voltage detection wires 24 are folded back twice as a whole. As a result, the surface (surface 22A of the second substrate 22) on which the other ends 24B of the second voltage detection wires 24 are arranged is the upper side (the front side in the direction perpendicular to the paper surface). In addition, the second folded back portion 27B is a fold that forms an angle of 45° with respect to the direction in which the wiring portion 25 extends, so that in the connector mounting portion 26, the second voltage detection wires 24 extend generally in the front-rear direction and are arranged at intervals in the left-right direction.

[0041] 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.

[0042] [First board] As shown in FIG. 6, the first substrate 21 is configured substantially similarly to the second substrate 22, and includes a plurality of first voltage detection wires 23, a wiring portion 28, a connector mounting portion 29, and a first folded portion 30. However, the configuration of the first folded portion 30 is different from that of the second folded portions 27A and 27B. The first substrate 21 further includes a plurality of thermistor circuits 31 that are not provided on the second substrate 22. The plurality of thermistor circuits 31 are circuits for measuring the temperature of the energy storage elements 11, and are formed only on the surface 21A of the first substrate 21 by the printed wiring technology, similar to the first voltage detection wires 23. The first substrate 21 of this embodiment is a flexible printed substrate.

[0043] [First voltage detection line, one end of the first voltage detection line, the other end of the first voltage detection line] As shown in Fig. 6, a plurality of (seven in this embodiment) first voltage detection wires 23 are formed on the first substrate 21. One end 23A of the first voltage detection wire 23 is set as the rear end of the first voltage detection wire 23. One end 23A of the first voltage detection wire 23 is arranged on the left side of the first substrate 21 with a gap therebetween in the front-rear direction, and is electrically connected to the connection bus bar 13 or the output bus bar 14 connected to the first electrode terminal 12A via a metal piece 15. The other end 23B of the first voltage detection wire 23 is set as the front end of the first voltage detection wire 23. The other end 23B of the first voltage detection wire 23 is adapted to be electrically connected to a connector 37 (see Fig. 8).

[0044] [Thermistor circuit, one end of the thermistor circuit, the other end of the thermistor circuit] As shown in Fig. 6, a plurality of thermistor circuits 31 (three in this embodiment) are formed on the front surface 21A of the first substrate 21 by printed wiring technology. The plurality of thermistor circuits 31 are arranged on the right side of the wiring portion 28. As shown in Fig. 7, 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. 6, 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.

[0045] As shown in FIG. 6, a part of the circuit including the thermistor 32 in the thermistor circuit 31 is disposed in a temperature measuring piece 35 provided on the first substrate 21. The temperature measuring piece 35 is provided in the rear part, the front part, and the intermediate part of the wiring part 28. The temperature measuring piece 35 is formed by making a cut in the wiring part 28, and is folded back toward the left-right central part of the electric storage element 11. As shown in FIG. 5 and FIG. 7, 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. By configuring in this way, as shown in FIG. 6, the temperature near the left-right central part of the upper surface of the electric storage element 11 arranged in the frontmost part, the rearmost part, and the intermediate part of the electric storage element 11 can be measured by the multiple thermistor circuits 31.

[0046] 5, in a state where the first substrate 21 is not folded back at the first folding back portion 30, the multiple first voltage detection wires 23 and thermistor circuits 31 arranged in the connector mounting portion 29 extend generally in the left-right direction and are arranged at intervals in the front-rear direction. The other end 23B of the first voltage detection wire 23, one end 31A of the thermistor circuit 31, and the other end 31B of the thermistor circuit 31 are arranged on the right end of the connector mounting portion 29.

[0047] As shown in Fig. 5, a first folded portion 30 is provided in a portion of the wiring portion 28 close to the connector mounting portion 29 across the entire width in the left-right direction of the wiring portion 28. The first folded portion 30 is a fold that forms an angle of 45° with respect to the extension direction of the wiring portion 28. As shown in Fig. 6, the wiring portion 28 is mountain-folded at the first folded portion 30.

[0048] As shown in FIG. 6, the first voltage detection wires 23 are folded back at the first folded back portion 30, and the first voltage detection wires 23 are folded back once as a whole. As a result, the surface (the front surface 21A of the first substrate 21) on which the other ends 23B of the first voltage detection wires 23 are arranged is the lower side (the back side in the direction perpendicular to the paper). In other words, the connector mounting portion 29 shown in FIG. 6 has the back surface 21B of the first substrate 21 facing upward (the front side in the direction perpendicular to the paper). The multiple thermistor circuits 31 are also arranged on the lower surface of the connector mounting portion 29. In addition, since the first folded back portion 30 is a fold that forms an angle of 45° with respect to the direction in which the wiring portion 28 extends, the first voltage detection wires 23 and thermistor circuits 31 in the connector mounting portion 29 extend approximately in the front-rear direction and are arranged at intervals in the left-right direction.

[0049] As shown in FIG. 6, the other ends 23B of the first voltage detection wires 23 are arranged close to each other from the right end of the connector mounting portion 29, and are arranged in the left-right direction in the order of 1, 3, 5, 7, 9, 11, and 13 in 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 wires 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 according to this embodiment and another energy storage module 10 are connected in series, the potential of the first voltage detection wire 23 labeled 13 may be greater than 0V because it is based on a relative potential difference with the other energy storage module 10.

[0050] As shown in FIG. 6, one end 31A of the thermistor circuit 31 connected to the ground potential is disposed at the left end of the connector mounting portion 29. The one end 31A of the thermistor circuit 31 is marked with a reference symbol GND (G in FIG. 9) indicating the ground potential. The potential of the one end 31A of the thermistor circuit 31 is the ground potential, i.e., 0 V. The other end 31B of the thermistor circuit 31 is disposed 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 reference symbols C, B, and A from the left, corresponding to the thermistors 32 disposed at the front, middle, and rearmost portions 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.

[0051] 6, in the connector mounting portion 29, 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 potential of 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 relatively close to each other, a short circuit between the thermistor circuit 31 and the first voltage detection line 23 can be suppressed.

[0052] [connector] 8, connector mounting portion 29 of first substrate 21 and connector mounting portion 26 of second substrate 22 are connected to connector 37 from the rear side (an example of the same side in the arrangement direction). Surface 21A of first substrate 21 on which other end 23B of first voltage detection wire 23 is formed and surface 22A of second substrate 22 on which other end 24B of second voltage detection wire 24 is formed are disposed to face each other in the up-down direction (an example of the facing direction).

[0053] As shown in FIG. 8, the connector 37 of this embodiment is a connector for flexible printed circuit boards, and includes a first terminal 38 connected to the first board 21, a second terminal 39 connected to the second board 22, 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.

[0054] 8, 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 board 21 to which the first terminal 38 has been soldered in advance, the intermediate housing 44, the second board 22 to which the second terminal 39 has been soldered in advance, and the lower housing 45 in the vertical direction.

[0055] 9 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 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 given to connection bus bars 13 or output bus bars 14 in Fig. 1. Similarly, the symbols G, C, B, and A given to first terminal 38 in Fig. 9 correspond to the symbols GND, C, B, and A given to one end 31A of the thermistor circuit 31 and the other end 31B of the thermistor circuit 31 in Fig. 6.

[0056] 9, 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, by arranging the first terminals 38 and the second terminals 39 with a vertical offset and making the connector 37 a two-stage type, 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-stage configuration like the connector 37 may be preferable.

[0057] 9, 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.

[0058] 9, 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.

[0059] [Effects of the First Embodiment] 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 the 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 comprising a first substrate 21 which is flexible and has a plurality of first voltage detection wires 23 on only one side thereof, a second substrate 22 which is flexible and has a plurality of second voltage detection wires 24 on only one side thereof, and a connector 37, in which the plurality of first voltage detection wires 23 are folded back once, and one end 23A of the first voltage detection wires 23 are electrically connected to a first electrode terminal 12A constituting one of the two rows of electrode terminals 12, The other ends 23B of the first voltage detection lines 23 are arranged in the left-right direction in the order of the potential of the first electrode terminals 12A electrically connected via the first voltage detection lines 23, and are electrically connected to the connector 37, the multiple second voltage detection lines 24 are folded back twice, and one end 24A of the second voltage detection lines 24 is electrically connected to the second electrode terminals 12B forming the other row, and the other ends 24B of the second voltage detection lines 24 are arranged in the left-right direction in the order of the potential of the second electrode terminals 12B electrically connected via the second voltage detection lines 24, and are electrically connected to the connector 37, and the first voltage detection lines 23 and the second voltage detection lines 24 are connected to the connector 37 from the rear side.

[0060] According to the above configuration, the first substrate 21 has a plurality of first voltage detection lines 23 on only one side, and the second substrate 22 has a plurality of second voltage detection lines 24 on only one side, so that a flexible substrate (flexible printed circuit board) having a conductive path formed on only one side can be used as the first substrate 21 and the second substrate 22, reducing the manufacturing cost of the wiring module 20. Since the plurality of first voltage detection lines 23 are folded back once, and the plurality of second voltage detection lines 24 are folded back twice, the other ends 23B of the first voltage detection lines 23 and the other ends 24B of the second voltage detection lines 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.

[0061] In the first embodiment, the surface of the first substrate 21 on which the other end 23B of the first voltage detection line 23 is arranged and the surface of the second substrate 22 on which the other end 24B of the second voltage detection line 24 is arranged are arranged to face each other.

[0062] According to the above configuration, first board 21 and second board 22 can be easily mounted on connector 37.

[0063] In embodiment 1, the first substrate 21 has a plurality of thermistor circuits 31 on the surface on which the first voltage detection line 23 is arranged, and one end 31A of the plurality of thermistor circuits 31 is connected to a common ground potential, and the other end 31B of the plurality of thermistor circuits 31 is connected to a connector 37 and is arranged between the ground potential and the other end 23B of the first voltage detection line 23 connected to the electrode terminal 12 with the lowest potential.

[0064] According to the above configuration, the multiple thermistor circuits 31 are arranged on the same surface as the first voltage detection line 23, so that a flexible substrate (flexible printed circuit board) having conductive paths formed on only one surface can be used as the first substrate 21, thereby reducing the manufacturing cost of the wiring module 20. In addition, the potential of the other end 31B of the multiple thermistor circuits 31 is relatively close to the potential of the first voltage detection line 23, which has the lowest potential, so that short-circuiting between the multiple thermistor circuits 31 and the first voltage detection line 23 can be suppressed.

[0065] 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.

[0066] According to the above configuration, the connector 37 can be made smaller in size in the left-right direction.

[0067] <Embodiment 2> A second embodiment of the present disclosure will be described with reference to Fig. 10. 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.

[0068] FIG. 10 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. 8 and 9), 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.

[0069] 10, 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.

[0070] [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.

[0071] According to the above configuration, the connector 137 can be made smaller in size in the vertical direction.

[0072] <Embodiment 3> A third embodiment of the present disclosure will be described with reference to Fig. 11. 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.

[0073] 11, the protector 50 is a plate-shaped member made of insulating synthetic resin. The protector 50 holds the first board 21, the second board 22, and the connector 37. Although the holding of the first board 21, the second board 22, and the connector 37 by the protector 50 is not shown, for example, fixing with an adhesive, locking with a locking structure, etc. can be adopted.

[0074] The wiring module 120 includes the protector 50, which allows the protection of each component. In the configuration of embodiment 1 that does not include the protector 50, as shown in FIG. 1, the portions of the first substrate 21 and the second substrate 22 that extend forward beyond the multiple energy storage elements 11 (hereinafter, referred to as extensions 22E) are exposed to the outside and are therefore particularly susceptible to damage when an external force is applied thereto. However, in embodiment 1, 3 11, the extension 22E is protected by the protector 50 and is not exposed to the outside. Therefore, damage to the extension 22E due to external forces can be suppressed. Furthermore, by providing the protector 50, the wiring module 120 can be easily assembled, transported, and the like.

[0075] [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 first substrate 21 and the second substrate 22.

[0076] According to the above configuration, the first substrate 21 and the second substrate 22 can be protected.

[0077] <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, the surface (front surface 21A) on which the other end 23B of the first voltage detection wire 23 of the first substrate 21 is arranged is opposed to the surface (front surface 22A) on which the other end 24B of the second voltage detection wire 24 of the second substrate 22 is arranged, but this is not limited to this, and the back surface of the first substrate and the back surface of the second substrate may be opposed to each other. (3) 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. (4) 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 board 21 to which the first terminal 38 is connected, and the second board 22 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 board and the second board. (5) In the above embodiment, no reinforcing plate was attached to the surface (back surface 21B) opposite the surface to which the first terminal 38 is connected in the connector mounting portion 29 of the first board 21, and to the surface (back surface 22B) opposite the surface to which the second terminal 39 is connected in the connector mounting portion 26 of the second board 22. However, this is not limited to this, and a reinforcing plate may be attached to the back surface of the connector mounting portion. (6) In the above embodiment, the first substrate 21 and the second substrate 22 are flexible printed substrates, but this is not limited thereto. Either or both of the first substrate and the second substrate may be a flexible flat cable. [Explanation of symbols]

[0078] 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: First board 21A: Surface 22: Second board 22A: Surface 22B: Back side 22E: Extension 23: First voltage detection wire 23A: One end 23B: other end 24: Second voltage detection wire 24A: One end 24B: Other end 25: Routing Department 26: Connector mounting part 27A, 27B: Second folded part 28: Routing Department 29: Connector mounting part 30: First turn-up part 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 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, A first substrate having flexibility and including a plurality of first voltage detection lines on only one surface thereof; a second substrate having flexibility and including a plurality of second voltage detection lines on only one surface of the second substrate; A connector, The first voltage detection lines are folded back an odd number of times, one end of the first voltage detection line is electrically connected to one of the two rows of electrode terminals via a metal piece and a bus bar; 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, and are electrically connected to the connector; the second voltage detection lines are not folded back or are folded back an even number of times; one end of the second voltage detection line is electrically connected to the electrode terminal in the other row via a metal piece and a bus bar; 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 and are electrically connected to the connector; A wiring module, 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 wiring module according to claim 1 , wherein a surface of the first substrate on which the other end of the first voltage detection line is arranged and a surface of the second substrate on which the other end of the second voltage detection line is arranged are arranged opposite each other.

3. the first substrate includes a plurality of thermistor circuits on a surface on which the first voltage detection line is disposed, One end of each of the plurality of thermistor circuits is connected to a common ground potential, 3. The wiring module according to claim 1, wherein the other ends of the plurality of thermistor circuits are connected to the connector and are arranged between the ground potential and the other end of the first voltage detection line connected to the electrode terminal having the lowest potential.

4. the connector includes 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 are aligned in a row in the spacing direction, The wiring module according to claim 1 , wherein the second terminals are arranged at positions different from the first terminals in the opposing direction of the first substrate and the second substrate, and are arranged in a row in the separation direction.

5. the connector includes 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 terminal and the second terminal are aligned in a row in the spacing direction, The wiring module according to claim 1 , wherein the first terminals and the second terminals are alternately arranged in the spacing direction and arranged in order of potential.

6. The wiring module according to claim 1 , further comprising a protector that protects the first substrate and the second substrate.

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