WO2022009545A1 - Flexible substrate - Google Patents

Abstract

A flexible substrate (30) comprises an insulating flex substrate (31), and a plurality of wiring patterns (32) formed on the flex substrate and having different potentials. At least some of the plurality of wiring patterns comprise a mesh wire (40) provided with a plurality of first wires (41) and a plurality of second wires (42) intersecting each other and electrically connected to each other.

Description

Flexible board Cross-reference of related applications

This application is based on Patent Application No. 2020-117902 filed in Japan on July 8, 2020, and the contents of the basic application are incorporated by reference as a whole.

The disclosures described herein relate to flexible substrates.

As shown in Patent Document 1, a battery wiring module including a circuit board portion is known.

Japanese Unexamined Patent Publication No. 2018-18612

The circuit board portion described in Patent Document 1 includes a substrate main body portion and a conductive layer formed on the substrate main body portion. Due to this conductive layer, the flexibility of the circuit board portion (flexible substrate) may decrease.

An object of the present disclosure is to provide a flexible substrate in which a decrease in flexibility is suppressed.

The flexible substrate according to one aspect of the present disclosure includes an insulating flexible substrate and a flexible substrate.
It has a plurality of wiring patterns with different potentials formed on a flexible substrate, and has.
At least a portion of the plurality of wiring patterns is a mesh wiring having a plurality of intersecting and electrically connected conductive wires.

According to this, it is suppressed that the flexibility of the flexible substrate is significantly different between the formed region and the non-formed region of the wiring pattern. Therefore, the decrease in the overall flexibility of the flexible substrate is suppressed.

It is a circuit diagram of a battery pack. It is a top view which shows the battery stack. It is a top view which shows the monitoring apparatus. It is a top view which shows the state which the monitoring device is arranged in the battery stack. It is a top view which shows the mesh wiring of 1st Embodiment. It is a top view which shows one form of mesh wiring. It is a top view which shows one form of mesh wiring. It is a top view which shows the mesh wiring of 2nd Embodiment. It is a top view which shows the mesh wiring of 3rd Embodiment. It is a top view which shows the modification of the mesh wiring. It is a top view which shows the mesh wiring of 4th Embodiment. It is a top view which shows the modification of the mesh wiring. It is an exploded perspective view for demonstrating the flexible substrate of 5th Embodiment. It is a perspective view which shows the mesh wiring of 6th Embodiment. It is an exploded perspective view for demonstrating the 1st mesh wiring and the 2nd mesh wiring. It is a top view which shows the modification of the monitoring apparatus.

Hereinafter, a plurality of forms for carrying out the present disclosure will be described with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding forms, and duplicate explanations may be omitted. When only a part of the configuration is described in each form, other forms described above can be applied to the other parts of the configuration.

It is possible to combine parts that clearly indicate that they can be specifically combined in each embodiment. Further, if there is no particular problem in the combination, it is possible to partially combine the embodiments, the embodiments and the modified examples, and the modified examples with each other, even if it is not clearly stated that the combinations are possible. be.

Hereinafter, embodiments will be described with reference to the figures.

(First Embodiment)
A battery pack including the flexible substrate according to the present embodiment and an example in which the battery pack is applied to a hybrid vehicle will be described with reference to FIGS. 1 to 7.

<Overview of battery pack>
The battery pack 400 functions to supply electric power to the electric load of the hybrid vehicle. This electrical load includes a motor generator that acts as a power source and power source. For example, when this motor generator powers up, the battery pack 400 discharges and supplies power to the motor generator. When the motor generator generates power, the battery pack 400 charges the generated power generated by the power generation.

The battery pack 400 has a battery ECU 300. The battery ECU 300 is electrically connected to various ECUs (vehicle-mounted ECUs) mounted on the hybrid vehicle. The battery ECU 300 and the vehicle-mounted ECU send and receive signals to each other to coordinately control the hybrid vehicle. By this coordinated control, the power generation and power running of the motor generator according to the charge amount of the battery pack 400, the output of the internal combustion engine, and the like are controlled. In the drawing, the battery ECU 300 is referred to as BAECU.

ECU is an abbreviation for electronic control unit. The ECU has at least one arithmetic processing unit (CPU) and at least one memory device (MMR) as a storage medium for storing programs and data. The ECU is provided by a microprocessor or a microcomputer equipped with a computer-readable storage medium. A storage medium is a non-transitional substantive storage medium that non-temporarily stores programs and data that can be read by a processor or computer. The storage medium may be provided by a semiconductor memory, a magnetic disk, or the like.

The battery pack 400 has a battery module 200. As shown in FIG. 2, the battery module 200 has a battery stack 210 in which a plurality of battery cells 220 are electrically and mechanically connected in series.

The battery pack 400 has a monitoring device 100. The monitoring device 100 detects the voltage of each battery cell 220 constituting the battery stack 210. The monitoring device 100 outputs the monitoring result to the battery ECU 300. The battery ECU 300 determines the equalization of SOCs of each of the plurality of battery cells 220 based on the monitoring result of the monitoring device 100. Then, the battery ECU 300 outputs an instruction for equalization processing based on the determination to the monitoring device 100. The monitoring device 100 performs equalization processing for equalizing the SOCs of the plurality of battery cells 220 according to the instructions input from the battery ECU 300. SOC is an abbreviation for state of charge.

As shown above, the battery pack 400 includes a monitoring device 100, a battery module 200, and a battery ECU 300. Although not shown, the battery pack 400 also has a blower fan for cooling the battery module 200. The drive of this blower fan is controlled by the battery ECU 300.

The battery pack 400 is provided in, for example, an arrangement space under a seat of a hybrid vehicle. Generally, the area under the back seat is wider than the area under the front seat. Therefore, the battery pack 400 of the present embodiment is provided in the arrangement space under the rear seat. However, the location of the battery pack 400 is not limited to this. For example, the battery pack 400 can be arranged between the rear seat and the trunk room, between the driver's seat and the passenger seat, and the like.

Next, the battery module 200 and the monitoring device 100 will be described. In the following, the three directions orthogonal to each other are referred to as the x direction, the y direction, and the z direction. In the present embodiment, the x direction is along the advancing / retreating direction of the hybrid vehicle. The y direction is along the left-right direction of the hybrid vehicle. The z direction is along the top and bottom direction of the hybrid vehicle. In the drawings, the description of "direction" is deleted, and the description is simply x, y, z. The x direction corresponds to the lateral direction. The y direction corresponds to the vertical direction. The z direction corresponds to the stacking direction.

<Overview of battery module>
As described above, the battery module 200 has a battery stack 210. Further, the battery module 200 has a battery case (not shown) for accommodating the battery stack 210. This battery case has a housing and a lid. The housing is made of die-cast aluminum. Alternatively, the housing is manufactured by pressing iron or stainless steel. The lid is made of a resin material or a metal material.

The housing has a box shape that opens in the z direction and has a bottom. The opening of the housing is covered by a lid. The housing and the lid form a storage space for accommodating the battery stack 210 and the monitoring device 100. A distribution channel through which wind flows is configured in the storage space. At least one of the housing and the lid is configured with a communication hole for communicating the external atmosphere and the distribution channel.

The battery stack 210 has a plurality of battery cells 220. These plurality of battery cells 220 are arranged in the y direction. The plurality of battery cells 220 are electrically and mechanically connected in series. Therefore, the output voltage of the battery module 200 is the sum of the output voltages of the plurality of battery cells 220.

<Overview of monitoring equipment>
As shown in FIG. 1, the monitoring device 100 has a monitoring unit 10 and a flexible substrate 30. The monitoring unit 10 monitors the voltage of each of the plurality of battery cells 220. The flexible substrate 30 electrically connects the monitoring unit 10 and each of the plurality of battery cells 220. The monitoring unit 10 and the flexible substrate 30 are provided in the battery module 200 in a manner aligned with the battery stack 210 in the z direction.

<Battery stack configuration>
As described above, the battery stack 210 has a plurality of battery cells 220. As shown in FIG. 2, the battery cell 220 has a quadrangular prism shape. The battery cell 220 has six sides.

The battery cell 220 has an upper end surface 220a facing in the z direction. Although not shown, the battery cell 220 has a lower end surface that is spaced apart from the upper end surface 220a in the z direction. This lower end surface faces the z direction. The battery cell 220 has a first side surface 220c and a second side surface 220d arranged apart from each other in the x direction. The first side surface 220c and the second side surface 220d face in the x direction. The battery cell 220 has a first main surface 220e and a second main surface 220f that are arranged apart from each other in the y direction. The first main surface 220e and the second main surface 220f face in the y direction. Of these six surfaces, the first main surface 220e and the second main surface 220f have a larger area than the other four surfaces.

The length of the battery cell 220 in the y direction is shorter than the length in the z direction and the x direction. Therefore, the battery cell 220 has a flat plate shape having a short length in the y direction. The plurality of battery cells 220 are arranged in this y direction.

The battery cell 220 is a secondary battery. Specifically, the battery cell 220 is a lithium ion secondary battery. Lithium-ion secondary batteries generate electromotive voltage through a chemical reaction. A current flows through the battery cell 220 due to the generation of the electromotive voltage. As a result, the battery cell 220 generates gas. The battery cell 220 expands. The battery cell 220 is not limited to the lithium ion secondary battery. For example, as the battery cell 220, a nickel-metal hydride secondary battery, an organic radical battery, or the like can be adopted.

As described above, the first main surface 220e and the second main surface 220f of the battery cell 220 have a larger area than the other four surfaces. Therefore, the battery cell 220 tends to expand in such a manner that the first main surface 220e and the second main surface 220f are separated from each other in the y direction. The battery cell 220 tends to expand in the direction in which the plurality of battery cells 220 are lined up.

The battery stack 210 has a restraint (not shown). By this restraint, the plurality of battery cells 220 are mechanically connected in series in the y direction. Further, this restraint suppresses the increase in the physique of the battery stack 210 due to the expansion of each of the plurality of battery cells 220. A gap is formed between the two battery cells 220 arranged adjacent to each other in the y direction. By passing air through this gap, heat dissipation of each battery cell 220 is promoted.

A positive electrode terminal 221 and a negative electrode terminal 222 are formed on the upper end surface 220a of the battery cell 220. The positive electrode terminal 221 and the negative electrode terminal 222 are arranged so as to be separated from each other in the x direction. The positive electrode terminal 221 is located on the first side surface 220c side. The negative electrode terminal 222 is located on the second side surface 220d side.

As shown in FIG. 2, two battery cells 220 arranged adjacent to each other face each other with the first main surface 220e facing each other and the second main surface 220f facing each other. The upper end surfaces 220a of the two battery cells 220 arranged adjacent to each other are arranged in the y direction. As a result, one positive electrode terminal 221 and the other negative electrode terminal 222 of the two battery cells 220 arranged adjacent to each other are arranged in the y direction. As a result, in the battery stack 210, the positive electrode terminals 221 and the negative electrode terminals 222 are alternately arranged in the y direction.

In the battery stack 210, the first electrode terminal group 211 in which the negative electrode terminals 222 and the positive electrode terminals 221 are alternately arranged in the y direction, and the second electrode terminal group 212 in which the positive electrode terminals 221 and the negative electrode terminals 222 are alternately arranged in the y direction. , Is configured. The first electrode terminal group 211 and the second electrode terminal group 212 are arranged so as to be separated from each other in the x direction.

Of the plurality of electrode terminals included in the first electrode terminal group 211 and the second electrode terminal group 212 described above, one positive electrode terminal 221 and one negative electrode terminal 222 adjacent to each other side by side in the y direction are connected via a series terminal 223. Mechanically and electrically connected. As a result, a plurality of battery cells 220 constituting the battery stack 210 are electrically connected in series.

The battery stack 210 of this embodiment has nine battery cells 220. Therefore, the total number of positive electrode terminals 221 and negative electrode terminals 222 is 18. As shown in FIGS. 1 and 2, these 18 electrode terminals are assigned a number (No) whose number increases from the lowest potential to the highest potential.

As shown in Fig. 2, No. 1 positive electrode terminal 221 and No. The negative electrode terminals 222 of 2 are arranged adjacent to each other in the y direction. The positive electrode terminals 221 and the negative electrode terminals 222 that are adjacent to each other in the x direction are connected via the series terminal 223.

In the same manner as this, in the first electrode terminal group 211, No. 1 and No. No. 2 electrode terminal, No. 5 and No. No. 6 electrode terminal, No. 9 and No. No. 10 electrode terminal, No. 13 and No. The electrode terminals of 14 are connected via the series terminal 223. In the second electrode terminal group 212, No. 3 and No. No. 4 electrode terminal, No. 7 and No. No. 8 electrode terminal, No. 11 and No. 12 electrode terminals, No. 15 and No. The 16 electrode terminals are connected via the series terminal 223. In this way, the nine battery cells 220 are connected in series via a total of eight series terminals 223.

Due to the connection configuration shown above, No. The negative electrode terminal 222 of 0 has the lowest potential. No. The positive electrode terminal 221 of 17 has the maximum potential. No. The positive electrode terminal 221 of 17 has a potential that is the sum of the outputs of the battery cells 220.

The output terminal 224 is connected to the negative electrode terminal 222 having the lowest potential and the positive electrode terminal 221 having the highest potential. These two output terminals 224 are electrically connected to the electrical load. As a result, the potential difference between the lowest potential and the highest potential is output to the electric load as the output voltage of the battery module 200.

By connecting the output terminal 224 to the negative electrode terminal 222 of the lowest potential or the positive electrode terminal 221 of the highest potential of another battery module 200, a configuration in which a plurality of battery modules 200 are connected in series or in parallel is adopted. You can also. The vehicle-mounted power supply that supplies electric power to the electric load may be configured by one battery module 200 or may be configured by a plurality of battery modules 200.

<Circuit configuration of monitoring device>
Next, the circuit configuration of the monitoring device 100 will be described with reference to FIG.

As shown in FIG. 1, the monitoring unit 10 has a wiring board 11, a first electronic element 12, and a monitoring IC chip 13. The first electronic element 12 and the monitoring IC chip 13 are mounted on the wiring board 11. The first electronic element 12 and the monitoring IC chip 13 are electrically connected to each other via the board wiring 14 of the wiring board 11.

The flexible board 30 is connected to the wiring board 11. The monitoring unit 10 and the battery stack 210 are electrically connected via the flexible substrate 30.

The wiring board 11 is provided with a connector (not shown). The wire 301 shown in FIG. 1 is connected to this connector. The monitoring unit 10 and the battery ECU 300 are electrically connected via the wire 301.

Note that the monitoring unit 10 and the battery ECU 300 may wirelessly transmit and receive signals. For example, in the case where a plurality of battery modules 200 are connected in series or in parallel as described above, the monitoring unit 10 is mounted on each of the plurality of battery modules 200. It is also possible to adopt a configuration in which each of the plurality of monitoring units 10 wirelessly transmits and receives signals to and from the battery ECU 300. Of course, it is also possible to adopt a configuration in which each of the plurality of monitoring units 10 transmits and receives signals to and from the battery ECU 300 by wire.

The flexible substrate 30 has an insulating flexible substrate 31 and a plurality of wiring patterns 32 formed on the flexible substrate 31.

One end of each of the plurality of wiring patterns 32 is connected to the series terminal 223 or the output terminal 224. The other end of each of the plurality of wiring patterns 32 is electrically connected to the plurality of board wirings 14. The battery cell 220 and the monitoring IC chip 13 are electrically connected by the wiring connection shown above.

In the following, for the sake of simplicity, the wiring patterns 32 and the board wiring 14 electrically connected to each other are collectively referred to as voltage detection wiring as appropriate.

As shown in FIG. 1, a second electronic element 60 is mounted on the flexible substrate 31. The second electronic element 60 has a fuse 61 and an inductor 62. Further, the monitoring unit 10 has a Zener diode 15, a parallel capacitor 16, and a resistor 17 as the first electronic element 12. Each of the Zener diode 15, the parallel capacitor 16, and the resistor 17 is mounted on the wiring board 11.

As shown in FIG. 1, a fuse 61, an inductor 62, and a resistor 17 are provided for each of the plurality of voltage detection lines. A fuse 61, an inductor 62, and a resistor 17 are connected in series from the battery cell 220 to the monitoring IC chip 13.

The Zener diode 15 and the parallel capacitor 16 are each connected in parallel between two voltage detection lines arranged in the order of potential. Specifically, a Zener diode 15 and a parallel capacitor 16 are connected between the inductor 62 and the resistor 17 in the voltage detection line. The anode electrode of the Zener diode 15 is connected to the low potential side of the two adjacent voltage detection lines. The cathode electrode of the Zener diode 15 is connected to the high potential side of the two adjacent voltage detection lines.

With the connection configuration shown above, the RC circuit is configured by the resistor 17 and the parallel capacitor 16. The RC circuit and the inductor 62 function as a filter for removing noise at the time of voltage detection.

The Zener diode 15 has a structure in which a short-circuit failure (short-circuit failure) occurs when an overvoltage is applied from the battery module 200. Specifically, the Zener diode 15 has a structure in which a PN junction type IC chip is sandwiched by a pair of leads. As a result, unlike the configuration in which the IC chip and the lead are indirectly connected via a wire, for example, the Zener diode 15 is prevented from opening failure due to the breakage of the wire due to the application of an overvoltage.

The fuse 61 is configured to be blown by a large current flowing through the voltage detection wiring when the Zener diode 15 is short-circuited due to an overvoltage. The rated current of the fuse 61 is set based on the large current flowing through the voltage detection wiring when the Zener diode 15 has a short-circuit failure due to an overvoltage. A large current is suppressed from flowing through the monitoring IC chip 13 due to the blown fuse 61.

As schematically shown in FIG. 1, the monitoring IC chip 13 has a driver 18 that performs signal processing such as amplification, and a plurality of switches 19 for charging / discharging a plurality of battery cells 220. This switch 19 controls the electrical connection between two voltage detection lines arranged in order of potential. One end of the switch 19 is connected to the wiring of the monitoring IC chip 13 connected to one of the two voltage detection lines arranged in the order of potential. The other end of the switch 19 is connected to the wiring of the monitoring IC chip 13 connected to the other of the two voltage detection lines arranged in the order of potential. The open / close control of the switch 19 controls the charging / discharging of the battery cell 220 electrically connected to the two voltage detection lines connected to the switch 19. In the drawing, the driver 18 is referred to as DR.

Further, the monitoring IC chip 13 has a comparator 20 for detecting the voltage of each of the plurality of battery cells 220. Two voltage detection lines arranged in order of potential are connected to the inverting input terminal and the non-inverting input terminal of the comparator 20. As a result, the positive electrode terminal 221 and the negative electrode terminal 222 of one battery cell 220 are connected to the inverting input terminal and the non-inverting input terminal of the comparator 20. The output terminal of the comparator 20 is connected to the wiring of the monitoring IC chip 13. The output of the comparator 20 is output to the battery ECU 300 as a differential amplification of the output voltage (electromotive voltage) of one battery cell 220.

The input impedance of the comparator 20 is higher than the output impedance. Therefore, the current flowing from the battery cell 220 to the comparator 20 is smaller than the current flowing through the battery stack 210 connected in series with the plurality of battery cells 220.

There is a correlation between the state of charge (SOC) of the battery cell 220 and the electromotive voltage. The battery ECU 300 stores this correlation. The battery ECU 300 detects the SOC of each of the plurality of battery cells 220 based on the stored correlation with the output voltage (electromotive voltage) input from the monitoring IC chip 13.

The battery cell 220 has an internal resistance. Therefore, there is a difference between the output voltage and the electromotive voltage of the battery cell 220 by the voltage drop based on the internal resistance and the current flowing through the battery cell 220. The battery ECU 300 may detect the SOC in consideration of the voltage drop, or may ignore the voltage drop and detect the SOC by assuming that the output voltage is equal to the electromotive voltage. The output voltage can be rephrased as a closed circuit voltage. The electromotive voltage can be rephrased as the open circuit voltage.

The battery ECU 300 determines the SOC equalization processing of the plurality of battery cells 220 based on the detected SOC. Then, the battery ECU 300 outputs an instruction for equalization processing based on the determination to the driver 18 of the monitoring IC chip 13. The driver 18 controls the opening / closing of the switch 19 corresponding to each of the plurality of battery cells 220 according to the instruction of the equalization process. As a result, the plurality of battery cells 220 are charged and discharged. Of the plurality of battery cells 220, the battery cell 220 having a relatively high SOC is discharged, and the battery cell 220 having a relatively low SOC is charged. As a result, the SOCs of the plurality of battery cells 220 are equalized.

The battery ECU 300 also detects the charge state of the battery stack 210 based on the input voltage and the like. The battery ECU 300 outputs the detected charge state of the battery stack 210 to the vehicle-mounted ECU. The in-vehicle ECU outputs a command signal to the battery ECU 300 based on the charging state, vehicle information such as the amount of depression of the accelerator pedal and the throttle valve opening degree input from various sensors mounted on the vehicle, and the ignition switch. The battery ECU 300 controls the connection between the battery stack 210 and the electric load based on this command signal.

Although not shown, a system main relay is provided between the battery stack 210 and the electric load. This system main relay controls the electrical connection between the battery stack 210 and the electrical load by the generation of a magnetic field. The battery ECU 300 controls the connection between the battery stack 210 and the electric load by controlling the generation of the magnetic field of the system main relay.

<Flexible substrate>
Next, the flexible substrate 30 will be described in detail. As described above, the flexible substrate 30 has a flexible substrate 31 and a wiring pattern 32.

The flexible substrate 31 is thinner than the wiring board 11 and is made of an insulating resin material that easily bends. Therefore, the flexible substrate 31 is bendable. The flexible substrate 31 has a thin flat shape with a length (thickness) between the front surface 31a arranged in the z direction and the back surface on the back side thereof.

To explain in detail, the flexible substrate 31 has one mother plate 33 and a plurality of protrusions 34. The base plate 33 has a larger physique than the protrusion 34. The planar shape of the base plate 33 is a rectangle extending in the y direction. The planar shape of the plurality of protrusions 34 forms a rectangle extending in the x direction.

As shown in FIG. 4, the mother plate 33 is provided on the upper end surface 220a of each of the plurality of battery cells 220. A notch (not shown) may be formed on the base plate 33 so as to be easily deformed according to the shape and arrangement of the plurality of battery cells 220 and the restraint. Further, a part of the mother plate 33 may have a bellows structure. Furthermore, in order to avoid obstructing the flow of wind in the accommodation space formed by the battery case, a notch or a hole penetrating in the z direction may be formed in the mother plate 33.

The protrusion 34 is integrally connected to each of the two side surfaces extending in the y direction of the mother plate 33. A plurality of protrusions 34 extending from one of the two side surfaces of the base plate 33 are arranged so as to be separated from each other in the y direction. The protrusion 34 may extend in an oblique direction inclined from the x direction to the y direction.

The wiring pattern 32 is formed on the surface 31a of each of the base plate 33 and the protrusion 34. Most of the wiring pattern 32 is covered with the coating resin. A second electronic element 60 such as a fuse 61 and an inductor 62 is electrically connected to an exposed portion of the wiring pattern 32 from the coating resin.

One end of the wiring pattern 32 is provided on the protrusion 34. The protrusion 34 and one end of the wiring pattern 32 are connected to the series terminal 223 or the output terminal 224. As a result, the wiring pattern 32 is electrically connected to the series terminal 223 or the output terminal 224.

The other end of the wiring pattern 32 is provided on the mother plate 33. The other end of the wiring pattern 32 is mechanically and electrically connected to the board wiring 14 of the wiring board 11 via solder and wires.

Note that in FIGS. 3 and 4, one wiring pattern 32 is represented by one monotonically extending line. However, by branching a part of one wiring pattern 32 into a plurality of branches, it is possible to adopt a configuration in which the wiring pattern 32 extends in a plurality of different directions.

<Wiring pattern>
As illustrated by hatching in FIGS. 3 and 4, the plurality of wiring patterns 32 include a mesh wiring 40 in which a plurality of thin wires are crossed and electrically connected. In this embodiment, each of the plurality of wiring patterns 32 is a mesh wiring 40. However, in addition to the mesh wiring 40, it is also possible to adopt a configuration in which a single wire or a solid pattern is included in a plurality of wiring patterns 32. The thin wire corresponds to the conductive wire.

As shown in FIG. 5, the mesh wiring 40 includes a plurality of first wirings 41 and a plurality of second wirings 42. The plurality of first wirings 41 and the plurality of second wirings 42 are made of the same conductive material. The lengths (thicknesses) of the plurality of first wirings 41 and the plurality of second wirings 42 orthogonal to the extension direction are the same. The size (cross-sectional area) of the cross section orthogonal to the extension direction of each of the plurality of first wiring 41 and the plurality of second wiring 42 is the same. Therefore, the electric conductivity in the extension direction of each of the first wiring 41 and the second wiring 42 is the same.

The forming material of the first wiring 41 and the second wiring 42 may be different. The thickness and cross-sectional area of the first wiring 41 and the second wiring 42 may be different. The first wiring 41 corresponds to the first conductive wire. The second wiring 42 corresponds to the second conductive wire.

The extension directions of each of the plurality of first wiring 41 are the same. The plurality of first wirings 41 are lined up while being separated in the y direction and the x direction. Similarly, the extension directions of the plurality of second wirings 42 are the same. The plurality of second wirings 42 are arranged so as to be separated from each other in the y direction and the x direction. In the present embodiment, the adjacent pitches of the plurality of first wirings 41 and the adjacent pitches of the plurality of second wirings 42 are equivalent. It is also possible to adopt a configuration in which the adjacent pitches of the plurality of first wirings 41 and the adjacent pitches of the plurality of second wirings 42 are not the same.

The extension directions of the first wiring 41 and the second wiring 42 are different. A plurality of the other of the first wiring 41 and the second wiring 42 intersect with one of the first wiring 41 and the second wiring 42. Since the plurality of first wirings 41 and the plurality of second wirings 42 intersect with each other, the mesh wirings 40 form a large number of lattices on the flexible substrate 31.

The extension direction of each of the first wiring 41 and the second wiring 42 is different from the extension direction of the mesh wiring 40. FIG. 5 shows the extension direction of the mesh wiring 40 by a broken line. The mesh wiring 40 shown in FIG. 5 is branched in the y direction and the x direction. The mesh wiring 40 extends in the y direction and the x direction, respectively. The extension direction of the mesh wiring 40 is equivalent to the energization direction of the current flowing through the mesh wiring 40.

The resistance value per unit length in the energization direction of the mesh wiring 40 depends on the extension directions of the first wiring 41 and the second wiring 42 with respect to the energization direction. That is, the resistance value per unit length in the energization direction of the mesh wiring 40 depends on the angle between the extension direction of each of the first wiring 41 and the second wiring 42 and the energization direction of the mesh wiring 40.

In the configuration shown in FIG. 5, the angle between the energization direction along the y direction and the first wiring 41 is θ1. The angle between the energization direction along the x direction and the first wiring 41 is θ2. These θ1 and θ2 are different. Therefore, the resistance values per unit length of the first wiring 41 in the y direction and the x direction are different.

Further, the angle between the energization direction along the y direction and the second wiring 42 is φ1. The angle between the energization direction along the x direction and the second wiring 42 is φ2. These φ1 and φ2 are different. Therefore, the resistance values per unit length of the second wiring 42 in the y direction and the x direction are different.

On the other hand, in the configuration shown in FIG. 6, θ1 and θ2 are equal, and φ1 and φ2 are equal. Each of these four angles is 45 °. The angles between the first wiring 41 and the second wiring 42 are θ1 + φ1 and θ2 + φ2, but the values of both are equal. Each of these two angles is 90 °.

In this configuration, the resistance values per unit length of the first wiring 41 in the y direction and the x direction are equal. The resistance values per unit length of the second wiring 42 in the y direction and the x direction are equal. Therefore, the resistance values per unit length of the mesh wiring 40 in the y direction and the x direction are equal. In order to equalize the resistance values per unit length of the mesh wiring 40 in the y direction and the x direction in this way, θ1 + φ1 and θ2 + φ2 may be equalized.

The angle between the first wiring 41 and the second wiring 42 is not strictly 90 ° due to a manufacturing error. The angle between the first wiring 41 and the second wiring 42 varies from 90 ° to ± 5 °.

In each of FIGS. 5 and 6, the overall shape of the mesh wiring 40 formed on the surface 31a is shown as a linear shape having a shorter length in the width direction orthogonal to the extension direction thereof. However, as shown in FIG. 7, for example, as the overall shape of one mesh wiring 40, a shape in which the extension direction and the width direction are equivalent can be adopted. The "line" described in the present embodiment also includes various forms such as a square shown in FIG. 7 and a circle (not shown).

<Action effect>
The wiring pattern 32 formed on the flexible substrate 31 includes a mesh wiring 40 in which a plurality of first wirings 41 and a plurality of second wirings 42 intersect and are electrically connected.

According to this, it is suppressed that the flexibility of the flexible substrate 30 is significantly different between the formed region and the non-formed region of the wiring pattern 32 in the flexible substrate 31. Therefore, the decrease in flexibility of the flexible substrate 30 is suppressed.

In addition, the surface area (surface layer) of the mesh wiring 40 is larger than that of a single wire. Therefore, even if the current is concentrated on the surface layer of the wiring due to the skin effect when the alternating current is energized, it is suppressed that the alternating current becomes difficult to flow.

The extension direction (energization direction) of the mesh wiring 40 is different from the extension direction of each of the first wiring 41 and the second wiring 42 included in the mesh wiring 40. In the configuration shown in FIG. 6, the angle θ1 between the energization direction along the y direction of the mesh wiring 40 and the first wiring 41 and the angle between the energization direction along the y direction of the mesh wiring 40 and the second wiring 42. φ1 is equal to each other. θ1 + φ1 is 90 °. Then, the angle θ2 between the energization direction along the x direction of the mesh wiring 40 and the first wiring 41 and the energization direction along the x direction of the mesh wiring 40 and the angle φ2 between the second wiring 42 are equal to each other. ing. θ2 + φ2 is 90 °.

Therefore, the resistance values per unit length of the mesh wiring 40 in the y direction and the x direction are equal. It is suppressed that anisotropy occurs in the electric conductivity of the mesh wiring 40 in the y direction and the x direction. The change in the extension direction of the mesh wiring 40 suppresses the change in the conductivity of the mesh wiring 40.

As described with reference to FIG. 5, the mesh wiring 40 is not limited to the configuration in which θ1 + φ1 and θ2 + φ2 are equal. For example, when the wiring length in the y direction of the mesh wiring 40 is longer than the wiring length in the x direction, by making θ1 + φ1 smaller than θ2 + φ2, the electric conductivity per unit length in the y direction is per unit length in the x direction. It may be higher than the electric conductivity of. As a result, it is possible to prevent a difference between the resistance value of the wiring path in the y direction and the resistance value of the wiring path in the x direction of the mesh wiring 40.

(Second Embodiment)
Next, the second embodiment will be described with reference to FIG.

In the first embodiment, the mesh wiring 40 has a plurality of first wirings 41 and a plurality of second wirings 42, and the portion extending in the y direction and the portion extending in the x direction of the mesh wiring 40 are the first wiring 41 and the first wiring, respectively. An example composed of two wirings 42 is shown. On the other hand, the mesh wiring 40 of the present embodiment has a plurality of third wirings 43 and a plurality of fourth wirings 44 in addition to the plurality of first wirings 41 and the plurality of second wirings 42. The first wiring 41 and the third wiring 43 correspond to the first conductive wire. The second wiring 42 and the fourth wiring 44 correspond to the second conductive wire.

As shown in FIG. 8, a portion of the mesh wiring 40 extending in the y direction is composed of a plurality of first wiring 41 and a plurality of second wiring 42. A portion of the mesh wiring 40 extending in the x direction is composed of a plurality of third wirings 43 and a plurality of fourth wirings 44. Then, a part of each of the third wiring 43 and the fourth wiring 44 intersects the first wiring 41 and the second wiring 42. As a result, the mesh wiring 40 extends in the y direction and the x direction.

By adopting such a configuration, the electrical conductivity of the portion extending in the y direction of the mesh wiring 40 and the electrical conductivity of the portion extending in the x direction can be independently determined.

The flexible substrate 30 described in the present embodiment includes components equivalent to those of the flexible substrate 30 described in the first embodiment. Therefore, it goes without saying that the flexible substrate 30 of the present embodiment has the same effect as that of the flexible substrate 30 described in the first embodiment. Therefore, the description is omitted. The description of overlapping actions and effects will be omitted in the other embodiments shown below.

(Third Embodiment)
Next, the third embodiment will be described with reference to FIGS. 9 and 10.

In the first embodiment, an example is shown in which the mesh wiring 40 has a plurality of first wirings 41 and a plurality of second wirings 42. On the other hand, the mesh wiring 40 of the present embodiment has the auxiliary wiring 45 extending along the extension direction of the mesh wiring 40 in addition to the plurality of first wiring 41 and the plurality of second wiring 42. The auxiliary wiring 45 corresponds to the auxiliary wire.

As shown in FIG. 9, the auxiliary wiring 45 has a first auxiliary wiring 45a that continuously extends in the y direction and a second auxiliary wiring 45b that continuously extends in the x direction. The first auxiliary wiring 45a and the second auxiliary wiring 45b increase the conductive path in the extension direction of the mesh wiring 40. Therefore, the electric conductivity of the mesh wiring 40 is increased.

Note that, for example, as shown in FIG. 10, each of the first auxiliary wiring 45a and the second auxiliary wiring 45b does not have to extend continuously and seamlessly. The plurality of first auxiliary wirings 45a may be separated from each other in the y direction and the x direction, and the plurality of second auxiliary wirings 45b may be separated from each other in the x direction and the y direction.

The discontinuous first auxiliary wiring 45a extending in the y direction is not electrically connected to each of the first wiring 41 and the second wiring 42 arranged in the y direction, but a part thereof is connected to each other. Similarly, the discontinuous second auxiliary wiring 45b extending in the x direction is not electrically connected to all the first wiring 41 and the second wiring 42 arranged in the x direction, but a part thereof is connected to each other. connect.

The conductivity in the y-direction and the x-direction of the mesh wiring 40 is also enhanced by such a configuration. At the same time, it is suppressed that the flexibility of the flexible substrate 30 is impaired by the first auxiliary wiring 45a and the second auxiliary wiring 45b.

The first auxiliary wiring 45a may extend not only in the y direction in which the mesh wiring 40 extends but also in the x direction. The second auxiliary wiring 45b may extend not only in the x direction in which the mesh wiring 40 extends but also in the y direction.

(Fourth Embodiment)
Next, the fourth embodiment will be described with reference to FIGS. 11 and 12.

In the first embodiment, an example is shown in which the mesh wiring 40 has both the first wiring 41 and the second wiring 42 having a linear shape. On the other hand, the mesh wiring 40 of the present embodiment includes a curved wiring 46 having a curved shape, as shown in FIG. The curved wiring 46 corresponds to a curved line.

The extension direction of the mesh wiring 40 and the extension direction of the curved wiring 46 are the same. However, the curved wiring 46 has a shape that periodically undulates in the extending direction thereof. The curved wiring 46 extends in the y direction and undulates in a manner in which the amplitude increases or decreases in the x direction.

The plurality of curved wirings 46 are lined up in the x direction while partially intersecting each other. As a result, the plurality of curved wirings 46 are electrically connected to each other. Note that FIG. 12 shows the mesh wiring 40 when the formation density of the curved wiring 46 is doubled as compared with the mesh wiring 40 shown in FIG.

(Fifth Embodiment)
Next, the fifth embodiment will be described with reference to FIG.

In the first embodiment, an example in which the wiring pattern 32 is formed on the surface 31a of the flexible substrate 31 is shown. On the other hand, in the present embodiment, as shown separately in FIG. 13, the flexible substrate 31 has a first flexible layer 35 and a second flexible layer 36 stacked and arranged in the z direction. The wiring pattern 32 is formed in each of the first flexible layer 35 and the second flexible layer 36.

A part of the plurality of mesh wirings 40 is a plurality of wirings (thin wires) formed in each of the first flexible layer 35 and the second flexible layer 36, and a plurality of wirings (thin wires) formed in these different flexible layers. It has a conductive via 37 that electrically connects the thin wire of the above.

In the present embodiment, as the above-mentioned plurality of thin wires, a plurality of first wiring 41 and a plurality of second wiring 42 are formed in each of the first flexible layer 35 and the second flexible layer 36. The conductive via 37 penetrates the first flexible layer 35 in the z direction.

The wiring pattern 32 formed on the first flexible layer 35 and the wiring pattern 32 formed on the second flexible layer 36 having different potentials are separated from each other in a direction orthogonal to the z direction. In FIG. 13, the projection pattern 38 in which the wiring pattern 32 formed on the first flexible layer 35 is projected onto the second flexible layer 36 is shown by a broken line. The shortest distance between the projection pattern 38 shown by the broken line and the wiring pattern 32 formed on the second flexible layer 36 having a potential different from that of the projection pattern 38 is d1.

This shortest separation distance d1 is shorter than the shortest separation distance d2 of a plurality of wiring patterns 32 having different potentials formed in the same flexible layer. The reason why the shortest separation distance is different in this way is that the two wiring patterns 32 are insulated depending on whether or not a part of the insulating flexible substrate 31 is interposed between the two wiring patterns 32. This is because the required distance (insulation distance) changes. By forming the wiring pattern 32 on the different flexible layers in this way, the shortest separation distance of the wiring patterns 32 of the different flexible layers can be shortened. Therefore, the increase in the physique of the flexible substrate 30 in the direction orthogonal to the z direction is suppressed.

The thickness of the first flexible layer 35 in the z direction can guarantee the insulation between the wiring pattern 32 formed on the first flexible layer 35 and the wiring pattern 32 formed on the second flexible layer 36. When it is thick, the wiring patterns 32 formed on these two flexible layers may face each other in the z direction. The shortest separation distance d1 may be set to zero. Regardless of whether the potentials are different or the same, the wiring pattern 32 formed on the first flexible layer 35 and the wiring pattern 32 formed on the second flexible layer 36 are interposed via the first flexible layer 35. Therefore, some of them may be arranged so as to face each other in the z direction.

The wiring pattern 32 formed on the first flexible layer 35 and the wiring pattern 32 formed on the second flexible layer 36 are in the z direction of each of the first flexible layer 35 and the second flexible layer 36. It is also possible to adopt a configuration in which the thickness is added and separated in the z direction.

In this embodiment, an example is shown in which the flexible substrate 31 has two flexible layers. However, the flexible substrate 31 may include three or more flexible layers. A configuration in which the wiring pattern 32 is formed can be adopted for at least one of these three or more flexible layers.

(Sixth Embodiment)
Next, the sixth embodiment will be described with reference to FIGS. 14 and 15.

In each embodiment, the relationship between the energization directions of the plurality of mesh wirings 40 having different potentials was not particularly mentioned. The energization directions of the plurality of mesh wirings 40 formed on the flexible substrate 31 are various and are not uniformly determined. However, depending on the layout of the plurality of mesh wirings 40, it is possible to run two mesh wirings 40 having opposite energization directions in parallel.

In the present embodiment, the energization directions are opposite to each other, and the first mesh wiring 40a and the second mesh wiring 40b formed in the first flexible layer 35 and the second flexible layer 36 in a misplaced manner are flexible substrates. It is formed at 31. The first mesh wiring 40a and the second mesh wiring 40b are arranged apart from each other in the x direction and extend in the y direction.

In FIGS. 14 and 15, the first mesh wiring 40a is shown by a solid line, and the second mesh wiring 40b is shown by a alternate long and short dash line. The energization direction of the first mesh wiring 40a is indicated by a solid line arrow, and the energization direction of the second mesh wiring 40b is indicated by a alternate long and short dash arrow.

Each of the first mesh wiring 40a and the second mesh wiring 40b has a plurality of first fragment wires 47 formed on the first flexible layer 35 and a plurality of second fragment wires 48 formed on the second flexible layer 36. And a plurality of conductive vias 37. Each of the first fragment line 47 and the second fragment line 48 is formed by, for example, a plurality of first wiring 41 and a plurality of second wiring 42 described in the first embodiment. In the drawings, each of the two fragment lines is represented by a single line in order to avoid complication of the notation.

As shown in FIG. 15, the extension direction of each of the first mesh wiring 40a and the second mesh wiring 40b is the y direction. The first fragment wire 47 and the second fragment wire 48 provided in each of these two mesh wirings are alternately arranged in the y direction. The first fragment wire 47 and the second fragment wire 48 arranged in the y direction are electrically connected via the conductive via 37.

The first fragment line 47 of the first mesh wiring 40a and the first fragment line 47 of the second mesh wiring 40b are lined up in the y direction. Between the two first fragment wires 47 arranged in the y direction provided by one of the first mesh wiring 40a and the second mesh wiring 40b, one first fragment provided by the other of the first mesh wiring 40a and the second mesh wiring 40b. Line 47 is located.

Similarly, the second fragment line 48 of the first mesh wiring 40a and the second fragment line 48 of the second mesh wiring 40b are lined up in the y direction. Between the two second fragment wires 48 arranged in the y direction provided by one of the first mesh wiring 40a and the second mesh wiring 40b, one second fragment provided by the other of the first mesh wiring 40a and the second mesh wiring 40b. Line 48 is located.

Since the flexible layer formed is different between the first fragment wire 47 of the first mesh wiring 40a and the second fragment wire 48 of the second mesh wiring 40b, they are naturally separated in the z direction. However, the positions of the first fragment line 47 and the second fragment line 48 in the y direction are the same. The first fragment line 47 and the second fragment line 48 are arranged so as to be separated from each other in the x direction. The first fragment line 47 and the second fragment line 48 arranged in the x direction are curved so as to be convex in the direction away from each other in the x direction.

Similarly, the positions of the second fragment line 48 of the first mesh wiring 40a and the first fragment line 47 of the second mesh wiring 40b in the y direction are the same. The second fragment line 48 and the first fragment line 47 are arranged so as to be separated from each other in the x direction, and are curved so as to be convex in the direction in which they are separated from each other in the x direction.

In this way, the first fragment wire 47 and the second fragment wire 48, whose energization directions are opposite to each other, are separated in the z direction and are separated in the x direction. A part of the insulating flexible substrate 31 is interposed between two different types of fragmented wires through which currents flow in opposite directions.

Further, the conductive via 37 of the first mesh wiring 40a and the conductive via 37 of the second mesh wiring 40b are arranged in the x direction. A part of the insulating flexible substrate 31 is interposed between the two conductive vias 37 in which the currents flow in the opposite directions.

As shown above, the first mesh wiring 40a and the second mesh wiring 40b whose energization directions are opposite to each other are twisted by the flexible substrate 31. A twisted pair cable is composed of these two mesh wirings. Therefore, the electromagnetic noise output from each of the first mesh wiring 40a and the second mesh wiring 40b cancel each other out, and these two mesh wirings are less likely to be affected by external noise.

As described above, a part of the flexible substrate 31 is interposed between the first mesh wiring 40a and the second mesh wiring 40b whose energization directions are opposite to each other. Therefore, the separation distance between the first mesh wiring 40a and the second mesh wiring 40b can be narrowed.

As a result, the electromagnetic noise output from each of the first mesh wiring 40a and the second mesh wiring 40b can be effectively canceled. At the same time, the formed region of the flexible substrate 31 of the first mesh wiring 40a and the second mesh wiring 40b can be reduced.

Further, since the noise resistance performance of the mesh wiring 40 is improved, it is possible to reduce the region for forming a solid pattern or the like whose potential is fixed to the reference potential on the flexible substrate 31 for removing electromagnetic noise. This prevents the flexibility of the flexible substrate 30 from being impaired. Instead of the solid pattern for measures against electromagnetic noise described above, for example, the mesh wiring 40 having the shape shown in FIG. 7 may be formed on the flexible substrate 31 and its potential may be fixed to the reference potential.

(First modification)
In each embodiment, the formation region and the formation density of a plurality of wirings (thin wires) included in the mesh wiring 40 are not particularly mentioned. Although not shown, the electric conductivity may be different depending on the location by providing a difference in the width of the formation region of the plurality of fine wires provided in the mesh wiring 40 depending on the location. By providing a difference in the formation density of the plurality of fine wires provided in the mesh wiring 40 depending on the location, the conductivity may be different depending on the location. The flexibility of the flexible substrate 30 may be different depending on the location by providing a difference in the width of the formation region of the plurality of fine wires provided in the mesh wiring 40 and the formation density of the plurality of fine wires depending on the location.

(Second modification)
In each embodiment, the mesh wiring 40 has been mainly described. Although not shown, for example, the portion of the wiring pattern 32 extending in the y direction may be mainly composed of the mesh wiring 40, and the portion of the wiring pattern 32 extending in the x direction may be mainly composed of a single wire. Further, a part of the portion extending in the y direction in the wiring pattern 32 may be formed of the mesh wiring 40, and the remaining portion extending in the y direction may be formed of a single wire. It is also possible to adopt a configuration in which the mesh wiring 40 is connected to one end of the second electronic element 60 and a single wire or a solid pattern is connected to the other end. By adopting such a configuration, the flexibility of the flexible substrate 30 may be different depending on the location.

(Third modification example)
In each embodiment, an example is shown in which the first wiring 41 and the second wiring 42 each have a linear shape. However, it is also possible to adopt a curved configuration in which at least one of the first wiring 41 and the second wiring 42 has a curved shape. By adopting the curved shape configuration in this way, it is possible to prevent the flexibility of the flexible substrate 30 from being impaired in the extension direction of at least one of the first wiring 41 and the second wiring 42.

(Fourth modification)
In each embodiment, an example in which the fuse 61 and the inductor 62 are provided on the flexible substrate 31 is shown. On the other hand, in addition to the fuse 61 and the inductor 62, for example, a configuration in which at least one of the Zener diode 15, the parallel capacitor 16, and the resistor 17 is provided on the flexible substrate 31 can be adopted.

(Fifth variant)
In each embodiment, for example, as shown in FIG. 4, an example in which the monitoring unit 10 is mounted on the flexible substrate 31 is shown. However, as shown in FIG. 16, for example, it is possible to adopt a configuration in which the monitoring unit 10 is not mounted on the flexible substrate 31. In this modification, the input / output connector 39 is provided on the flexible substrate 31. The input / output connector 39 and the monitoring unit 10 are electrically connected via a wire harness 70. Note that the description of the second electronic device 60 is omitted in FIG.

(Other variants)
In each embodiment, an example is shown in which a battery pack 400 including a flexible substrate 30 is applied to a hybrid vehicle. However, the battery pack 400 can also be applied to electric vehicles such as plug-in hybrid vehicles and electric vehicles.

In each embodiment, an example in which the flexible substrate 30 is applied to the battery pack 400 is shown. However, the application of the flexible substrate 30 is not limited to the above example. It can be applied to various consumer electric appliances having a purpose of adopting a flexible substrate 30 having flexibility.

For example, since the arrangement space is limited, the flexible substrate 30 can be applied to an electric product whose shape is required to be changed according to the arrangement space. The flexible substrate 30 can be applied to an electric product in which an increase in body shape and electromagnetic noise is a concern due to an increase in signal lines.

Although the present disclosure has been described in accordance with the examples, it is understood that the present disclosure is not limited to the examples and structures. The present disclosure also includes various variations and variations within a uniform range. In addition, although various combinations and forms are shown in this disclosure, other combinations and forms that include only one element, more, or less are also within the scope of this disclosure. It is a thing.

Claims (8)

Insulating flexible substrate (31) and
It has a plurality of wiring patterns (32) having different potentials formed on the flexible substrate.
A flexible substrate in which at least a part of the plurality of wiring patterns is a mesh wiring (40, 40a, 40b) including a plurality of conductive wires (41 to 44, 46) that are electrically connected while intersecting with each other. A claim that the plurality of conductive wires included in the mesh wiring include a first conductive wire (41, 43) and a second conductive wire (42, 44) that have different extension directions and intersect with each other. The flexible substrate according to 1. The flexible substrate according to claim 2, wherein the angle between the first conductive wire and the second conductive wire is 90 °. The flexible substrate according to claim 2 or 3, wherein at least one of the first conductive wire and the second conductive wire is a curved line. In addition to the first conductive wire and the second conductive wire, the plurality of conductive wires included in the mesh wiring extend in the extension direction of the mesh wiring, and the plurality of first conductive wires and the second conductive wire are included. The flexible substrate according to any one of claims 2 to 4, wherein an auxiliary wire (45, 45a, 45b) electrically connected to at least two of the wires is included. The flexible substrate according to claim 1, wherein the plurality of conductive wires included in the mesh wiring include a curved wire (46) extending while waving in an extension direction of the mesh wiring. The flexible substrate includes a plurality of flexible layers (35, 36) laminated and arranged in the stacking direction.
In addition to the plurality of conductive wires, the mesh wiring includes conductive vias (37) that electrically connect different first flexible layers and second flexible layers among the plurality of flexible layers.
The flexibility according to any one of claims 1 to 6, wherein a plurality of the conductive wires formed in each of the first flexible layer and the second flexible layer are electrically connected via the conductive via. substrate. The mesh wiring includes a first mesh wiring (40a) and a second mesh wiring (40b) that run in parallel in the vertical direction orthogonal to the stacking direction while the energization direction is opposite.
A plurality of the conductive wires formed on one of the first flexible layer and the second flexible layer of the first mesh wiring, and the first flexible layer and the second flexible layer of the second mesh wiring. The plurality of conductive wires formed on the other side of the layer are separated from each other in the stacking direction, and are arranged in the horizontal direction orthogonal to the stacking direction and the vertical direction.
The flexible substrate according to claim 7, wherein the conductive via of the first mesh wiring and the conductive via of the second mesh wiring are arranged in the horizontal direction.

Images