Wiring board and battery device

A wiring board connected to a positive electrode terminal and a negative electrode terminal of each of battery cells, the wiring board comprising:

• a base material being electrically insulated;
• and
• a wiring including
• conductive patterns layered with the base material interposed between the conductive patterns;
• and
• an interlayer connection member that electrically connects the conductive patterns in different layers, wherein
• the wiring includes
• pair wiring portions, each of which has
• a positive electrode wiring section connected to the positive electrode terminal of a respective one of the battery cells, and
• a negative electrode wiring section connected to the negative electrode terminal of the respective one of the battery cells,
• the positive electrode wiring section and the negative electrode wiring section extend in parallel,
• the positive electrode wiring section and the negative electrode wiring section are in the different layers of the conductive pattern
• the thickness direction of the base material corresponds to a stacking direction along which the positive electrode wiring section and the negative electrode wiring section are stacked,
• in the stacking direction, the positive electrode wiring section is located above the negative electrode wiring section in at least one of the pair wiring portions,
• in the stacking direction, the negative electrode wiring section is located above the positive electrode wiring section in at least another of the pair wiring portions, and
• when the battery cells are numbered sequentially from one end, a vertical positional relationship in the stacking direction between the positive electrode wiring section and the negative electrode wiring section is reversed at each interval, each interval corresponding to a distance spanning an even-numbered one of the battery cells as counted from the one end.

A battery device comprising:

• battery cells, each of which has a positive electrode terminal and a negative electrode terminal;
• a wiring board connected to the battery cells;
• and
• a battery monitoring device configured to monitor the battery cells connected to the wiring board, wherein
• the wiring board includes:
• a base material being electrically insulated;
• and
• a wiring having
• conductive patterns layered with the base material interposed between the conductive patterns, and
• an interlayer connection member that electrically connects the conductive patterns in different layers,
• the wiring includes pair wiring portions, each of which has
• a positive electrode wiring section connected to the positive electrode terminal of a respective one of the battery cells, and
• a negative electrode wiring section connected to the negative electrode terminal of the respective one of the battery cells,
• the battery monitoring device includes:
• a battery monitoring circuit having
• first conversion circuits, each first conversion circuit connected to the positive electrode terminal and the negative electrode terminal of a respective one of the battery cells, each first conversion circuit configured to output an electrical signal for measuring a complex impedance of the respective one of the battery cells by converting an analog signal to a digital signal, and
• second conversion circuits, each second conversion circuit connected to the positive electrode terminal and the negative electrode terminal of a respective one of the battery cells, each second conversion circuit configured to output an electrical signal for detecting a state of the respective one of the battery cells by converting an analog signal to a digital signal;
• and
• a circuit board having terminal pairs correspondingly provided for the first conversion circuits, each terminal pair configured to connect a respective one of the first conversion circuits to a target cell being a respective one of the battery cells,
• the pair wiring portions are connected to the terminal pairs,
• the positive electrode wiring section and the negative electrode wiring section extend in parallel,
• the pair wiring portions are arranged side-by-side in a width direction perpendicular to a thickness direction of the base material, and
• adjacent two of the pair wiring portions are different from each other in respective widths of the positive electrode wiring section and the negative electrode wiring section.

A battery device comprising:

• battery cells, each of which has a positive electrode terminal and a negative electrode terminal;
• a wiring board connected to the battery cells;
• and
• a battery monitoring device configured to monitor the battery cells connected to the wiring board, wherein
• the wiring board includes:
• a base material being electrically insulated;
• and
• a wiring having
• conductive patterns layered with the base material interposed between the conductive patterns, and
• an interlayer connection member that electrically connects the conductive patterns in different layers,
• the wiring includes pair wiring portions, each of which has
• a positive electrode wiring section connected to the positive electrode terminal of a respective one of the battery cells, and
• a negative electrode wiring section connected to the negative electrode terminal of the respective one of the battery cells,
• the battery monitoring device includes:
• a battery monitoring circuit having
• first conversion circuits, each first conversion circuit connected to the positive electrode terminal and the negative electrode terminal of a respective one of the battery cells, each first conversion circuit configured to output an electrical signal for measuring a complex impedance of the respective one of the battery cells by converting an analog signal to a digital signal, and
• second conversion circuits, each second conversion circuit connected to the positive electrode terminal and the negative electrode terminal of a respective one of the battery cells, each second conversion circuit configured to output an electrical signal for detecting a state of the respective one of the battery cells by converting an analog signal to a digital signal;
• and
• a circuit board having terminal pairs correspondingly provided for the first conversion circuits, each terminal pair configured to connect a respective one of the first conversion circuits to a target cell being a respective one of the battery cells,
• the pair wiring portions are connected to the terminal pairs,
• the positive electrode wiring section and the negative electrode wiring section extend in parallel,
• the positive electrode wiring section and the negative electrode wiring section are in the different layers of the conductive patterns,
• the thickness direction of the base material corresponds to a stacking direction in which the positive electrode wiring section and the negative electrode wiring section are stacked,
• in the stacking direction, the positive electrode wiring section is located above the negative electrode wiring section in at least one of the pair wiring portions,
• in the stacking direction, the negative electrode wiring section is located above the positive electrode wiring section in at least another of the pair wiring portions, and
• when the battery cells are numbered sequentially from one end, a vertical positional relationship in the stacking direction between the positive electrode wiring section and the negative electrode wiring section is reversed at each interval, each interval corresponding to a distance spanning an even-numbered one of the battery cells as counted from the one end.