Wiring substrate and battery device

Abstract

A flexible substrate is connected to positive and negative terminals of a plurality of battery cells. The flexible substrate has a base material (34) having electrical insulation and a wiring. The wiring has an upper layer wiring (31) and a lower layer wiring (32) which are layered via the base material, and a lead wire (32) which electrically connects the upper layer wiring and the lower layer wiring. Further, the wiring includes a differential pair wiring which is composed of a positive wiring portion (309p) connected to the positive terminal of the battery cell and a negative wiring portion (308n) connected to the negative terminal of the battery cell. In the differential pair wiring, the positive wiring portion and the negative wiring portion are arranged in parallel.

Description

[0001] Mutual citation of related applications

[0002] This application is based on Japanese Patent Application No. 2023-193175, filed on November 13, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to wiring substrates and battery devices. Background Technology

[0004] As disclosed in Patent Document 1, there is a battery monitoring device for monitoring a battery that includes multiple battery cells.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2023-95746 Summary of the Invention

[0008] The battery monitoring device may be structured to connect to each individual battery cell via a wiring board. The wiring board includes wiring connected to the positive terminal and wiring connected to the negative terminal of each battery cell. However, depending on the structure of the wiring board, the spacing between the two wirings may widen, potentially allowing noise to enter between them.

[0009] One objective of this disclosure is to provide a wiring substrate and battery device capable of reducing noise.

[0010] A wiring substrate is disclosed herein. It is a wiring board that connects to the positive and negative terminals of multiple battery cells, including: Electrically insulating substrate; and The wiring includes patterned wiring stacked via substrate layers and interlayer connection members that electrically connect the patterned wiring of different layers. The cabling includes multiple pairs of cabling sections. The paired wiring section consists of a positive wiring section connected to the positive terminal of each battery cell and a negative wiring section connected to the negative terminal of each battery cell. In the paired wiring section, the positive wiring section and the negative wiring section are arranged in parallel.

[0011] Thus, the wiring substrate includes patterned wiring stacked via a substrate and wiring with conductors. Therefore, compared to a single-layer substrate where the wiring is a single layer, the wiring substrate can increase the freedom of wiring layout. Therefore, the wiring substrate can suppress the widening of the gap between the positive and negative wiring portions in paired wiring sections. That is, by increasing the freedom of wiring layout, the wiring substrate facilitates the formation of paired wiring sections through positive and negative wiring sections. Therefore, the wiring substrate can reduce noise in paired wiring sections.

[0012] Additionally, a battery device is disclosed herein. The battery device includes: a plurality of battery cells; a wiring board connected to the plurality of battery cells; and a battery monitoring device connected to the wiring board and monitoring the battery cells. Each battery cell includes a positive terminal and a negative terminal. The wiring substrate includes: Electrically insulating substrate; and The wiring includes patterned wiring stacked via substrate layers and interlayer connection members electrically connecting the patterned wiring of different layers, and is connected to positive and negative terminals. The cabling includes multiple pairs of cabling sections. The paired wiring section consists of a positive wiring section connected to the positive terminal of each battery cell and a negative wiring section connected to the negative terminal of each battery cell. The battery monitoring device includes a battery monitoring circuit and a circuit board. The battery monitoring circuit has the following features: Multiple first conversion circuits, connected to the positive and negative terminals of each battery cell, convert analog signals into digital signals and output electrical signals for measuring the complex impedance of each battery cell; and Multiple second conversion circuits, connected to the positive and negative terminals of each battery cell, convert analog signals into digital signals and output electrical signals for status detection of each battery cell. The circuit board has terminal pairs, which are connected to each first conversion circuit and the corresponding battery cell, i.e., the target cell. The paired wiring sections are connected to the terminal pairs, and the positive wiring section and the negative wiring section are arranged in parallel.

[0013] Thus, the battery device includes: a plurality of battery cells; a wiring board connected to the plurality of battery cells; and a battery monitoring device connected to the wiring board and monitoring the battery cells. As described above, the wiring board can reduce noise in the paired wiring sections. Therefore, the battery device can output a battery voltage for complex impedance measurement with reduced noise from the first conversion circuit.

[0014] The various methods disclosed in this specification employ different technical means to achieve their respective purposes. The symbols set forth in the claims and within parentheses of each claim illustratively indicate their correspondence with portions of the embodiments described later, and are not intended to limit the scope of the technology. The purposes, features, and effects disclosed in this specification will become even clearer with reference to the following detailed description and the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a diagram showing a schematic structure of the battery device in the first embodiment.

[0016] Figure 2 It is along Figure 1 A sectional view along line II-II.

[0017] Figure 3 It is along Figure 1 A cross-sectional view along line III-III.

[0018] Figure 4 It is along Figure 1 A cross-sectional view along line IV-IV.

[0019] Figure 5 It is along Figure 1 A cross-sectional view of the VV line.

[0020] Figure 6 This is a diagram showing a schematic structure of the battery monitoring device and the flexible substrate in the first embodiment.

[0021] Figure 7 This is a diagram showing a schematic structure of the battery device in the second embodiment.

[0022] Figure 8 It is along Figure 7 A cross-sectional view of line VIII-VIII.

[0023] Figure 9 It is along Figure 7 A cross-sectional view of the IX-IX line.

[0024] Figure 10 It is along Figure 7 A cross-sectional view along the XX line.

[0025] Figure 11 This is a diagram showing a schematic structure of the battery device in the third embodiment.

[0026] Figure 12 It is along Figure 11 A cross-sectional view along line XII-XII.

[0027] Figure 13 It is along Figure 11A cross-sectional view of line XIII-XIII.

[0028] Figure 14 It is along Figure 11 A cross-sectional view of line XIV-XIV.

[0029] Figure 15 This is a diagram showing a schematic structure of the battery device in the fourth embodiment.

[0030] Figure 16 It is along Figure 11 A cross-sectional view along the XVI-XVI line.

[0031] Figure 17 It is along Figure 11 A cross-sectional view along line XVII-XVII.

[0032] Figure 18 It is along Figure 11 A cross-sectional view of the XVIII-XVIII line.

[0033] Figure 19 This is a diagram showing a schematic structure of the battery monitoring device and the flexible substrate in the fifth embodiment.

[0034] Figure 20 This is a diagram showing a schematic structure of the battery monitoring device and flexible substrate in the sixth embodiment.

[0035] Figure 21 This is a diagram showing a schematic structure of the flexible substrate in the seventh embodiment. Detailed Implementation

[0036] The following description, with reference to the accompanying drawings, illustrates various methods for implementing this disclosure. In each method, the same reference numerals are sometimes used for portions corresponding to matters described in prior methods, and repeated descriptions are omitted. In each method, where only a portion of the structure is described, other previously described methods can be referenced and applied to the remaining parts of the structure.

[0037] <Battery Device>

[0038] (First Implementation)

[0039] use Figures 1-6 The battery device of this embodiment will be described below. Figure 1As shown, the battery device mainly includes a battery pack 10, a flexible substrate 30, a battery monitoring device 70, etc. The battery device is configured to be installed on a mobile body, such as a vehicle, aircraft, ship, construction machinery, or agricultural machinery. The battery device can also be referred to as a battery system. In this embodiment, as an example, a battery device including a battery pack 10 is used, and the battery pack 10 includes multiple battery cells 11 to 18. However, the battery device only needs to include multiple battery cells 11 to 18. That is, the multiple battery cells 11 to 18 may not be divided into units of battery pack 10.

[0040] A plurality of battery cells 11 to 18 are arranged in a battery pack 10. The battery cells 11 to 18 in the battery pack 10 are connected in series. A flexible substrate 30 is connected to each battery cell 11 to 18. The flexible substrate 30 is also connected to a battery monitoring device 70. Furthermore, the battery pack 10 is connected to the battery monitoring device 70 via the flexible substrate 30. In this battery device, each battery cell 11 to 18 is monitored by the battery monitoring device 70. In this embodiment, as an example, one battery pack 10 and one battery monitoring device 70 corresponding to that battery pack 10 are used. However, this disclosure is not limited to this. The battery device may also include multiple battery packs 10 and multiple battery monitoring devices 70 corresponding to each battery pack 10. Additionally, the battery device may include multiple battery packs 10 and a shared battery monitoring device 70 for each of the multiple battery packs 10. Furthermore, the battery device may also include a microcomputer connected to the battery monitoring device 70. In this case, the flexible substrate 30 may also be provided in a manner shared by multiple battery packs 10 and multiple battery monitoring devices 70. Alternatively, the flexible substrate 30 can also be configured to be shared by multiple battery packs 10 and a battery monitoring device 70.

[0041] <Battery Pack>

[0042] Each battery cell 11 to 18 can be, for example, a lithium-ion secondary battery or a nickel-metal hydride secondary battery. In this embodiment, as an example, a battery pack 10 comprising eight battery cells 11 to 18 is used. However, the battery pack 10 may simply include multiple battery cells.

[0043] like Figure 1As shown, each battery cell 11-18 has positive terminals 11p-18p and negative terminals 11n-18n at both ends along its long side. Specifically, the first battery cell 11 has a first positive terminal 11p and a first negative terminal 11n. The second battery cell 12 has a second positive terminal 12p and a second negative terminal 12n. The third battery cell 13 has a third positive terminal 13p and a third negative terminal 13n. The fourth battery cell 14 has a fourth positive terminal 14p and a fourth negative terminal 14n. The fifth battery cell 15 has a fifth positive terminal 15p and a fifth negative terminal 15n. The sixth battery cell 16 has a sixth positive terminal 16p and a sixth negative terminal 16n. The seventh battery cell 17 has a seventh positive terminal 17p and a seventh negative terminal 17n. The eighth battery cell 18 has an eighth positive terminal 18p and an eighth negative terminal 18n.

[0044] Each terminal 11p-18p and 11n-18n is connected to busbars 21-29. The first busbar 21 is connected to the first negative terminal 11n. The second busbar 22 is connected to the first positive terminal 11p and the second negative terminal 12n. The third busbar 23 is connected to the second positive terminal 12p and the third negative terminal 13n. The fourth busbar 24 is connected to the third positive terminal 13p and the fourth negative terminal 14n. The fifth busbar 25 is connected to the fourth positive terminal 14p and the fifth negative terminal 15n. The sixth busbar 26 is connected to the fifth positive terminal 15p and the sixth negative terminal 16n. The seventh busbar 27 is connected to the sixth positive terminal 16p and the seventh negative terminal 17n. The eighth busbar 28 is connected to the seventh positive terminal 17p and the eighth negative terminal 18n. The ninth busbar 29 is connected to the eighth positive terminal 18p. Thus, multiple battery cells 11 to 18 are connected in series via busbars 22 to 28.

[0045] Flexible substrate

[0046] use Figures 1-5 The flexible substrate 30 will be described below. Additionally, in... Figure 1 In order to make the attached diagram easier to understand, solid lines represent upper-layer wiring 31 and dashed lines represent lower-layer wiring 32. Similarly, conductors 33 are represented by × marks (crossed lines).

[0047] The flexible substrate 30 is connected to the positive terminals 11p-18p and negative terminals 11n-18 of the plurality of battery cells 11-18. The flexible substrate 30 is a substrate used to connect the battery monitoring device 70 and the battery pack 10. The flexible substrate 30 is equivalent to a wiring substrate. In this embodiment, a flexible substrate is used as an example of a wiring substrate. However, a rigid substrate can also be used as the wiring substrate. Furthermore, the flexible substrate 30 only needs to be connected to the plurality of battery cells 11-18, and may not necessarily correspond to the battery pack 10 as a unit.

[0048] like Figures 2-5 As shown, the flexible substrate 30 includes an electrically insulating substrate 34 and wiring 3 disposed on the substrate 34. The wiring 3 has an upper layer wiring 31 and a lower layer wiring 32 stacked across the substrate 34; and a conductor 33 electrically connecting the upper layer wiring 31 and the lower layer wiring 32 of different layers. In addition, the wiring 3 is covered by the substrate 34 with its ends exposed. The ends of the wiring 3 are connection portions to the busbars 21-29 and the circuit board 50.

[0049] The conductor 33 is mainly composed of conductive materials such as copper and silver. The conductor 33 connects the upper layer wiring 31 and the lower layer wiring 32. The conductor 33 is equivalent to an interlayer connection component.

[0050] The upper layer wiring 31 and the lower layer wiring 32 are mainly composed of conductive materials such as aluminum and copper. The upper layer wiring 31 and the lower layer wiring 32 are formed by patterning conductive thin films. The upper layer wiring 31 and the lower layer wiring 32 are stacked along the thickness direction of the substrate 34. The upper layer wiring 31 and the lower layer wiring 32 are equivalent to patterned wiring. The upper layer wiring 31 and the lower layer wiring 32 can also be called layer wiring.

[0051] like Figure 1 As shown, the wiring 3 has multiple wiring sections 301 to 309 that are respectively connected to each busbar 21 to 29. Each wiring section 301 to 309 is composed of an upper wiring 31, a conductor 33, and a lower wiring 32. Each wiring section 301 to 309 has the following structure: one end is connected to the busbar 21 to 29, and the other end is connected to the circuit board 50.

[0052] Specifically, the first wiring section 301 is connected to the first busbar 21. The second wiring section 302 is connected to the second busbar 22. The third wiring section 303 is connected to the third busbar 23. The fourth wiring section 304 is connected to the fourth busbar 24. The fifth wiring section 305 is connected to the fifth busbar 25. The sixth wiring section 306 is connected to the sixth busbar 26. The seventh wiring section 307 is connected to the seventh busbar 27. The eighth wiring section 308 is connected to the eighth busbar 28. The ninth wiring section 309 is connected to the ninth busbar 29.

[0053] Furthermore, each wiring section 301-309 is configured such that the portion connecting to each busbar 21-29 is exposed from the substrate 34. Similarly, each wiring section 301-309 is configured such that the portion connecting to the circuit board 50 is exposed from the substrate 34. The portion connecting to the circuit board 50 is part of the connector section 60.

[0054] As described above, the second busbar 22 to the eighth busbar 28 are connected to the terminals of two adjacent battery cells. Therefore, the second wiring section 302 to the eighth wiring section 308 are provided in a manner shared by two adjacent battery cells. The second wiring section 302 to the eighth wiring section 308 are equivalent to shared wiring.

[0055] Therefore, the second wiring section 302 to the eighth wiring section 308 are connected to the positive terminal of one of the two battery cells 11 to 18, and to the negative terminal of the other battery cell. Furthermore, the second wiring section 302 to the eighth wiring section 308 are each branched into a positive wiring section and a negative wiring section. In other words, the second wiring section 302 to the eighth wiring section 308 each include a positive wiring section and a negative wiring section. Additionally, the positive wiring sections 302p to 309p are also referred to as positive wiring section 3p. On the other hand, the negative wiring sections 301n to 308n are also referred to as negative wiring section 3n.

[0056] Specifically, the second wiring section 302 branches into a second positive wiring section 302p and a second negative wiring section 302n. The second positive wiring section 302p functions as a wiring section connected to the first positive terminal 11p. The second negative wiring section 302n functions as a wiring section connected to the second negative terminal 12n.

[0057] The third wiring section 303 branches into a third positive wiring section 303p and a third negative wiring section 303n. The third positive wiring section 303p functions as a wiring section connected to the second positive terminal 12p. The third negative wiring section 303n functions as a wiring section connected to the third negative terminal 13n.

[0058] The fourth wiring section 304 branches into a fourth positive wiring section 304p and a fourth negative wiring section 304n. The fourth positive wiring section 304p functions as a wiring section connected to the third positive terminal 13p. The fourth negative wiring section 304n functions as a wiring section connected to the fourth negative terminal 14n.

[0059] The fifth wiring section 305 branches into a fifth positive wiring section 305p and a fifth negative wiring section 305n. The fifth positive wiring section 305p functions as a wiring section connected to the fourth positive terminal 14p. The fifth negative wiring section 305n functions as a wiring section connected to the fifth negative terminal 15n.

[0060] The sixth wiring section 306 branches into a sixth positive wiring section 306p and a sixth negative wiring section 306n. The sixth positive wiring section 306p functions as a wiring section connected to the fifth positive terminal 15p. The sixth negative wiring section 306n functions as a wiring section connected to the sixth negative terminal 16n.

[0061] The seventh wiring section 307 branches into a seventh positive wiring section 307p and a seventh negative wiring section 307n. The seventh positive wiring section 307p functions as a wiring section connected to the sixth positive terminal 16p. The seventh negative wiring section 307n functions as a wiring section connected to the seventh negative terminal 17n.

[0062] The eighth wiring section 308 branches into an eighth positive wiring section 308p and an eighth negative wiring section 308n. The eighth positive wiring section 308p functions as a wiring section connected to the seventh positive terminal 17p. The eighth negative wiring section 308n functions as a wiring section connected to the eighth negative terminal 18n.

[0063] Furthermore, the first wiring section 301 is connected only to the first negative terminal 11n of one of the plurality of terminals 11p to 18p and 11n to 18n of the first battery cell 11. Therefore, the first wiring section 301 is also referred to as the first negative terminal wiring section 301n. Similarly, the ninth wiring section 309 is connected only to the eighth positive terminal 18p of one of the plurality of terminals 11n to 18n and 11p to 18p of the eighth battery cell 18. The ninth wiring section 309 is also referred to as the ninth positive terminal wiring section 309p.

[0064] Furthermore, such as Figure 2 , Figure 4 As shown, the positive electrode wiring portion 3p and the negative electrode wiring portion 3n are configured as differential pair wiring. That is, the flexible substrate 30 includes multiple differential pair wirings, which are composed of positive electrode wiring portions 302p to 309p connected to the positive terminals 11p to 18p of each battery cell 11 to 18, and negative electrode wiring portions 301n to 308n connected to the negative terminals 11n to 18n of each battery cell 11 to 18. The flexible substrate 30 has multiple differential pair wirings corresponding to each battery cell 11 to 18. In each differential pair wiring, the positive electrode wiring portion and the negative electrode wiring portion are arranged in parallel. The differential pair wiring is equivalent to a pair wiring portion. A differential pair wiring is a wiring in which two wirings are arranged in parallel and transmit electronic signals of the same magnitude but opposite polarity on their respective wirings.

[0065] Specifically, as differential pair wiring, the flexible substrate 30 includes: a first negative electrode wiring portion 301n and a second positive electrode wiring portion 302p, a second negative electrode wiring portion 302n and a third positive electrode wiring portion 303p, a third negative electrode wiring portion 303n and a fourth positive electrode wiring portion 304p, a fourth negative electrode wiring portion 304n and a fifth positive electrode wiring portion 305p. Additionally, as differential pair wiring, the flexible substrate 30 includes: a fifth negative electrode wiring portion 305n and a sixth positive electrode wiring portion 306p, a sixth negative electrode wiring portion 306n and a seventh positive electrode wiring portion 307p, a seventh negative electrode wiring portion 307n and an eighth positive electrode wiring portion 308p, an eighth negative electrode wiring portion 308n and a ninth positive electrode wiring portion 309p.

[0066] For example, the first negative electrode wiring section 301n and the second positive electrode wiring section 302p can be referred to as differential pair wiring for the first battery cell 11. Furthermore, the second negative electrode wiring section 302n and the third positive electrode wiring section 303p can be referred to as differential pair wiring for the second battery cell 12. Alternatively, it can be said that the second wiring section 302 to the eighth wiring section 308 each branch into different differential pair wiring sections for positive and negative electrodes. Furthermore, the positive electrode wiring sections 302p to 309 and the negative electrode wiring sections 301n to 308n can also be considered as parts of each differential pair wiring. That is, it can be said that a portion of the first negative electrode wiring section 301n and a portion of the second positive electrode wiring section 302p constitutes the differential pair wiring.

[0067] In addition, such as Figure 4 As shown, the positive electrode wiring portions 302p to 309p and the negative electrode wiring portions 301n to 308n of the differential pair wiring are disposed on different layers separated by the substrate 34. In this embodiment, as an example, the positive electrode wiring portions 302p to 309p are composed of upper layer wiring 31, and the negative electrode wiring portions 301n to 308n are composed of lower layer wiring 32. However, this disclosure is not limited thereto.

[0068] Furthermore, such as Figure 4 As shown, in each differential pair wiring, the positive electrode wiring portions 302p to 309p and the negative electrode wiring portions 301n to 308n are arranged opposite each other in the thickness direction of the substrate 34. That is, the positive electrode wiring portions and negative electrode wiring portions constituting the differential pair wiring are arranged opposite each other and parallel in the thickness direction of the substrate 34. For example, the first negative electrode wiring portion 301n and the second positive electrode wiring portion 302p connected to the first battery cell 11 are arranged opposite each other in the thickness direction of the substrate 34 and are arranged in parallel.

[0069] However, this disclosure is not limited thereto. The positive and negative wiring portions constituting the differential pair wiring may also be arranged in parallel on the same layer. That is, the positive and negative wiring portions constituting the differential pair wiring may also be arranged in parallel on the same layer.

[0070] Each differential pair wiring is connected to each terminal pair 60a of the circuit board 50. A terminal pair 60a is formed by pairing two terminals of the circuit board 50. Therefore, the circuit board 50 has multiple terminal pairs 60a. Multiple terminal pairs 60a are included in the connector portion 60. Each terminal pair 60a is connected to each first ADC 41. The circuit board 50 and the first ADC 41 will be described later.

[0071] In addition, such as Figure 1 , Figure 3 , Figure 5 As shown, the flexible substrate 30 has portions where patterned wirings of the same layer intersect each other. In this embodiment, the lower layer wirings 32 intersect. Therefore, the flexible substrate 30 includes a wiring avoidance portion 35 to avoid the intersecting lower layer wirings 32. The wiring avoidance portion 35 includes a conductor 33 and an upper layer wiring 31.

[0072] In this embodiment, wiring 3 is used, which carries electrical signals for measuring the complex impedance of battery cells 11-18 and electrical signals for detecting the state of battery cells 11-18. However, the flexible substrate 30 may also have wiring 3 other than those described above.

[0073] <Battery Monitoring Device>

[0074] use Figure 1 , Figure 6 The battery monitoring device 70 will be described below. Figure 6 The diagram primarily illustrates the parts corresponding to certain battery cells 10m-1, 10m, and 10m+1. Additionally, battery cells 10m-1 and 10m+1 are adjacent to battery cell 10m.

[0075] like Figure 6 As shown, the battery monitoring device 70 is connected to multiple battery cells 11-18. The battery monitoring device 70 includes a battery monitoring IC 40 that monitors the multiple battery cells 11-18; and a circuit board 50 connecting the battery monitoring IC 40 and the multiple battery cells 11-18. Specifically, the circuit board 50 is connected to the multiple battery cells 11-18 via a flexible substrate 30. The battery monitoring IC 40 corresponds to a battery monitoring circuit. Furthermore, the battery monitoring device 70 only needs to be connected to the multiple battery cells 11-18, and may not necessarily correspond to the battery pack 10 unit.

[0076] The flexible substrate 30 and the circuit board 50 are connected by a plurality of first terminal portions 81 and a plurality of second terminal portions 82. The first terminal portions 81 and the second terminal portions 82 represent the locations where the connection terminals of the flexible substrate 30 and the circuit board 50 are connected. The first terminal portions 81 and the second terminal portions 82 are included in the connector portion 60. A pair of first terminal portions 81 and second terminal portions 82 includes a terminal pair 60a. Therefore, it can be said that the flexible substrate 30 and the circuit board 50 include a plurality of pairs of first terminal portions 81 and second terminal portions 82. Furthermore, the connection terminals of the circuit board 50 to the flexible substrate 30 include a plurality of terminal pairs 60a, etc.

[0077] The battery monitoring IC 40 and the circuit board 50 are connected via a plurality of third terminal portions 91 and a plurality of fourth terminal portions 92. The third terminal portions 91 and the fourth terminal portions 92 indicate the locations where the connection terminals of the battery monitoring IC 40 are connected to the connection terminals of the circuit board 50.

[0078] The connection terminals in the battery monitoring IC 40 include circuit terminal pairs 40a. A circuit terminal pair 40a is formed by pairing two terminals of the battery monitoring IC 40. The battery monitoring IC 40 has multiple circuit terminal pairs 40a. Each of the multiple circuit terminal pairs 40a is connected to each of the first ADCs 41. Additionally, each of the multiple circuit terminal pairs 40a is connected to multiple terminal pairs 60a. Therefore, the differential pair wiring is connected to each circuit terminal pair 40a via each terminal pair 60a.

[0079] like Figure 6 As shown, the battery monitoring IC 40 includes a first ADC 41, a second ADC 42, a complex impedance measurement circuit 43, a first voltage measurement circuit 44, a second voltage measurement circuit 45, an equalization circuit 46, an equalization switch 47, and a control circuit 48. In the accompanying drawings, the complex impedance measurement circuit 43 is designated ZC, the first voltage measurement circuit 44 is designated 1VC, the second voltage measurement circuit 45 is designated 2VC, the equalization circuit 46 is designated EC, and the control circuit 48 is designated CC. ADC is short for Analog-to-Digital Converter. The first ADC 41 corresponds to the first conversion circuit. The second ADC 42 corresponds to the second conversion circuit.

[0080] The battery monitoring IC 40 has a circuit terminal pair 40a connected to each of the first ADCs 41 and the corresponding individual device for each first ADC 41. The circuit terminal pair 40a is provided with respect to each first ADC 41.

[0081] The first ADC 41, the second ADC 42, the complex impedance measurement circuit 43, the first voltage measurement circuit 44, and the second voltage measurement circuit 45 are respectively provided corresponding to the multiple battery cells 11 to 18. The equalization circuit 46 and the equalization switch 47 are respectively provided corresponding to the multiple battery cells 11 to 18. The control circuit 48 is provided in a shared manner with respect to the multiple battery cells 11 to 18.

[0082] As described above, the battery monitoring IC 40 has two ADCs 41 and 42 relative to a single battery cell. Therefore, the battery monitoring IC 40 includes multiple first ADCs 41 and multiple second ADCs 42. Figure 6 As an example, the diagram illustrates ADCs 41 and 42 for a 10m-1 battery cell, ADCs 41 and 42 for a 10m battery cell, ADCs 41 and 42 for a 10m+1 battery cell, and ADCs 41 and 42 for a 10m+2 battery cell.

[0083] Furthermore, the first ADC 41 for battery cell 10m-1 and the first ADC 41 for battery cell 10m+1 can also be referred to as a conversion circuit adjacent to the first ADC 41 for battery cell 10m. Moreover, the battery monitoring IC 40 includes a pair of second ADCs 42 connected to each of the first ADCs 41 in the same battery cell.

[0084] ADCs 41 and 42 convert analog signals into digital signals (hereinafter referred to as AD conversion). The start time of the conversion period for ADCs 41 and 42 is indicated by control circuit 48. From the start time, ADCs 41 and 42 convert analog signals into digital signals within a specified period. Hereinafter, the first ADC 41 and the second ADC 42 corresponding to the same battery cell will be described as a set.

[0085] The input terminal of the first ADC 41 is connected to the third terminal section 91 and the fourth terminal section 92. The third terminal section 91 is connected to the first terminal section 81. On the other hand, the fourth terminal section 92 is connected to the second terminal section 82. The first ADC 41 is connected to the positive and negative terminals of a battery cell via the third terminal section 91 and the fourth terminal section 92.

[0086] It can be said that the first terminal portion 81 and the second terminal portion 82 connected to the first ADC 41 include terminal pairs 60a corresponding to the first ADC 41. For example, the first terminal portion 81 connected to the positive terminal of the battery cell 10m and the second terminal portion 82 connected to the negative terminal of the battery cell 10m include terminal pairs 60a corresponding to the first ADC 41 used in the battery cell 10m. The first terminal portion 81 connected to the positive terminal of the battery cell 10m+1 and the second terminal portion 82 connected to the negative terminal of the battery cell 10m+1 include terminal pairs 60a corresponding to the first ADC 41 used in the battery cell 10m+1.

[0087] The battery cell connected to the first ADC 41 is equivalent to the target cell. As explained later, the first ADC 41 outputs an electrical signal for measuring the complex impedance of the battery cell. Therefore, the target cell can also be referred to as the measurement target cell.

[0088] The output terminal of the first ADC 41 is connected to the complex impedance measurement circuit 43. The first ADC 41 converts the voltage across the target cell into a digital signal and outputs it as an electrical signal for measuring the complex impedance of the target cell. The complex impedance measurement circuit 43 is a digital circuit that uses this electrical signal to calculate a complex voltage at a specific frequency. The complex voltage is the voltage used for complex impedance measurement. The control circuit 48 uses the complex voltage output from the complex impedance measurement circuit 43 to measure (calculate) the complex impedance of the target cell. Specifically, the control circuit 48 is configured to acquire the complex current flowing through the battery pack 10. Furthermore, the control circuit 48 uses the complex voltage and complex current to calculate the complex impedance.

[0089] Furthermore, in this embodiment, control circuit 48 is used as an example of a control circuit for measuring the complex impedance of a single cell. However, this disclosure is not limited to this. The complex impedance of a single cell can also be measured by a microcomputer. That is, the microcomputer can also measure the complex impedance of the single cells in multiple battery packs 10. In this case, the microcomputer is capable of acquiring the complex current flowing through the battery pack 10 and acquiring the complex voltage from each battery pack 10. Therefore, the microcomputer is included in the control circuit. The microcomputer can also be configured to acquire complex voltage and complex current via a communication interface. The battery monitoring device 70 may also include a microcomputer.

[0090] Furthermore, the output terminal of the first ADC 41 is connected to the first voltage measurement circuit 44. The first ADC 41 converts the voltage across the target cell into a digital signal and outputs it as an electrical signal for state detection of the target cell. That is, the electrical signal output by the first ADC 41 is used for complex impedance measurement and state detection. The first voltage measurement circuit 44 is a digital circuit that uses the electrical signal output from the first ADC 41 to measure the battery voltage of the target cell. Alternatively, it can be said that the first voltage measurement circuit 44 calculates the battery voltage for state detection. The first voltage measurement circuit 44 can, for example, employ a low-pass filter. The second voltage measurement circuit 45, which will be described later, is similarly configured.

[0091] The input terminals of the second ADC 42 are connected to the third terminal section 91 and the fourth terminal section 92. The output terminal of the second ADC 42 is connected to the second voltage measurement circuit 45. The second ADC 42 converts the voltage across the target unit into a digital signal and outputs it as an electrical signal for detecting the state of the target unit.

[0092] The second voltage measuring circuit 45 is a digital circuit that measures the battery voltage of a target cell using the electrical signal output from the second ADC 42. Alternatively, the second voltage measuring circuit 45 can be described as calculating the battery voltage for state detection. The second ADC 42 and the second voltage measuring circuit 45 are provided for monitoring faults in the state of the target cell. Furthermore, the state of the target cell may also include the state of the paths connected to the target cell.

[0093] The control circuit 48 monitors for faults by comparing the measurement results of the first voltage measuring circuit 44 and the measurement results of the second voltage measuring circuit 45. For example, the control circuit 48 determines a fault when the two measurement results differ, or when the two measurement results deviate by more than a specified value. Furthermore, the measurement result is the battery voltage of the target cell.

[0094] As described above, the paired ADCs 41 and 42 are connected to the third terminal portion 91 and the fourth terminal portion 92. However, the terminal portions 91 and 92 connected to the second ADC 42 are different from the terminal portions 91 and 92 connected to the input terminals of the paired first ADC 41. That is, the second ADC 42 is connected to the terminal pair 60a, which is connected to the first ADC 41, which is different from the paired first ADC 41.

[0095] As an example, ADCs 41 and 42 for a 10m battery cell will be used for explanation. The first ADC 41 is connected to the third terminal 91 and the fourth terminal 92, which are connected to the differential pair wiring for the 10m battery cell. On the other hand, the second ADC 42 is connected to the fourth terminal 92 and the third terminal 91. The fourth terminal 92 is connected to one side of the differential pair wiring for the 10m+1 battery cell, and the third terminal 91 is connected to one side of the differential pair wiring for the 10m-1 battery cell. That is, the first ADC 41 is connected to the differential pair wiring for the target cell. On the other hand, the second ADC 42 is connected to the differential pair wiring for the two battery cells adjacent to the target cell. Thus, it can be said that the second ADC 42 is connected to the terminal pair 60a connected to the adjacent conversion circuit. Furthermore, the connected terminal pair 60a can also be referred to as the corresponding terminal pair 60a.

[0096] Furthermore, the conversion frequencies of ADCs 41 and 42 for AD conversion can be the same or different. Here, as an example, ADCs 41 and 42 with different conversion frequencies are used. Multiple first ADCs 41 include a first high-frequency circuit and a first low-frequency circuit with different conversion frequencies. Similarly, multiple second ADCs 42 include a second high-frequency circuit and a second low-frequency circuit with different conversion frequencies. Additionally, low frequency and high frequency are relative conversion frequencies. The conversion frequency of the low-frequency circuit is lower than that of the high-frequency circuit.

[0097] The first high-frequency circuit and the second low-frequency circuit target the same individual cells and are arranged in pairs. Similarly, the first low-frequency circuit and the second high-frequency circuit target the same individual cells and are arranged in pairs. For example, in ADCs 41 and 42 corresponding to battery cell 10m+1, the first ADC 41 is the first low-frequency circuit, and the second ADC 42 is the second high-frequency circuit. In ADCs 41 and 42 corresponding to battery cell 10m, the first ADC 41 is the first low-frequency circuit, and the second ADC 42 is the second low-frequency circuit. In ADCs 41 and 42 corresponding to battery cell 10m-1, the first ADC 41 is the first low-frequency circuit, and the second ADC 42 is the second high-frequency circuit.

[0098] The first high-frequency circuit and the second high-frequency circuit can also be referred to as the main ADC. The first low-frequency circuit and the second low-frequency circuit can also be referred to as the auxiliary ADC. In addition, the first voltage measuring circuit 44 connected to the first high-frequency circuit and the second voltage measuring circuit 45 connected to the second high-frequency circuit can also be referred to as the main voltage measuring circuit. On the other hand, the first voltage measuring circuit 44 connected to the first low-frequency circuit and the second voltage measuring circuit 45 connected to the second low-frequency circuit can also be referred to as the auxiliary voltage measuring circuit.

[0099] Furthermore, the conversion frequency of all first ADCs 41 can be higher than that of all second ADCs 42. In this case, the conversion frequency of each first ADC 41 is the same. Similarly, the conversion frequency of each first ADC 41 is the same. In addition, the ADC connected to the complex impedance measurement circuit 43 can also be an ADC that can perform AD conversion with higher accuracy compared to the ADC without the complex impedance measurement circuit 43.

[0100] The equalization switch 47 is used to equalize the capacity deviation of multiple battery cells 11 to 18. That is, the equalization switch 47 is a switch that allows current to flow in order to make the capacity of the multiple battery cells 11 to 18 consistent. The equalization switch 47 is controlled to be turned on and off by the equalization circuit 46.

[0101] The first ADC 41 includes a connection conversion circuit connected to an equalization switch 47 and a non-connection conversion circuit not connected to the equalization switch 47. The first ADC 41 used for battery cell 10m+1 and the first ADC 41 used for battery cell 10m-1 are equivalent to the connection conversion circuit. The first ADC 41 used for battery cell 10m is equivalent to the non-connection conversion circuit.

[0102] The circuit board 50 includes an electrically insulating substrate and conductive wiring disposed on the substrate. The circuit board 50 is a so-called printed circuit board.

[0103] The wiring of the circuit board 50 includes a portion connecting the first terminal portion 81 and the third terminal portion 91, and a portion connecting the second terminal portion 82 and the fourth terminal portion 92. The circuit board 50 includes, for example, a filter circuit including resistors and capacitors.

[0104] A battery monitoring IC 40 is mounted on the circuit board 50. The circuit board 50 has connection terminals to which multiple circuit terminal pairs 40a are connected. These connection terminals are connected to the wiring of the circuit board 50. Alternatively, these connection terminals can also be considered as part of the wiring of the circuit board 50.

[0105] Additionally, the circuit board 50 has terminal pairs 60a connected to each of the first ADCs 41 and the corresponding individual components of each first ADC 41. The terminal pairs 60a are respectively provided with respect to each first ADC 41. Therefore, the circuit board 50 has multiple terminal pairs 60a. The multiple terminal pairs 60a are connected to the wiring of the circuit board 50. Furthermore, the multiple terminal pairs 60a can also be considered as part of the wiring of the circuit board 50.

[0106] <Effect>

[0107] As described above, the flexible substrate 30 includes wiring 3 having an upper wiring 31, a lower wiring 32, and a conductor 33. Therefore, compared to a single-layer substrate where the wiring 3 is a single layer, the flexible substrate 30 can improve the degree of freedom in the layout of the wiring 3. Therefore, the flexible substrate 30 can suppress the widening of the spacing between the positive and negative wiring portions in differential wiring.

[0108] That is, by increasing the degree of freedom in the layout of the wiring 3, the flexible substrate 30 can easily form differential pair wiring through the positive and negative wiring portions. Therefore, the flexible substrate 30 can reduce noise in the differential pair wiring. Specifically, the flexible substrate 30 can reduce the induced noise entering between the positive and negative wiring portions that constitute the differential pair wiring. In addition, the main source of induced noise is the excitation current.

[0109] Furthermore, it can be said that the flexible substrate 30 can reduce the area Z1 between the positive and negative wiring portions constituting the differential pair wiring. Therefore, the flexible substrate 30 can reduce noise in the differential pair wiring. In addition, the area Z1 can also be referred to as the noise-affected area.

[0110] Furthermore, the flexible substrate 30 comprises differential wiring pairs formed by upper wiring 31 and lower wiring 32. Therefore, the spacing between the positive and negative wiring portions constituting the differential wiring pairs can be defined by the thickness of the substrate 34 disposed between the positive and negative wiring portions. Thus, compared to differential wiring pairs formed by wiring in the same layer, the flexible substrate 30 can reduce the spacing between the positive and negative wiring portions of the differential wiring pairs.

[0111] The battery monitoring device 70 includes multiple first ADCs 41 that output battery voltages for complex impedance measurement of each of the battery cells 11-18. Terminal pairs 60a, connected to each first ADC 41 and the target battery cell, are respectively provided with respect to each first ADC 41. Therefore, the battery monitoring device 70 can be easily wired to the multiple battery cells 11-18 via differential pair wiring. Thus, the battery monitoring device 70 can output a battery voltage for status detection from a second ADC 42 and a battery voltage for complex impedance measurement with reduced noise from the first ADC 41.

[0112] Therefore, the battery monitoring device 70 can measure the complex impedance of each battery cell 11 to 18 with high accuracy. That is, the battery monitoring device 70 can measure the complex impedance in a state where the influence of induced noise between the positive and negative wiring portions constituting the differential pair wiring is reduced. In addition, compared with the structure of the sixth embodiment described later, the battery monitoring device 70 can reduce the number of terminals between the battery monitoring IC 40 and the circuit board 50.

[0113] Furthermore, the battery device includes a flexible substrate 30 and a battery monitoring device 70. Therefore, the battery device can output a battery voltage for complex impedance measurement with reduced noise from the first ADC 41. Moreover, the battery device can measure the complex impedance of each individual battery cell 11 to 18 with high accuracy.

[0114] The preferred embodiments of this disclosure have been described above. However, this disclosure is not limited to any of the above embodiments, and various modifications can be made without departing from the spirit of this disclosure. Hereinafter, the second to seventh embodiments will be described as other aspects of this disclosure. The above embodiments and the second to seventh embodiments can be implemented individually or in appropriate combinations. This disclosure is not limited to the combinations shown in the embodiments, but can be implemented through various combinations.

[0115] (Second Implementation)

[0116] use Figures 7-10 The battery device according to the second embodiment will be described. In the second embodiment, the parts that differ from the first embodiment will be mainly described. In the second embodiment, the flexible substrate 30 differs from that in the first embodiment. The constituent elements of the flexible substrate 30 in the second embodiment are the same as those in the first embodiment, but the arrangement of the wiring 3 differs from that in the first embodiment. Figure 7 It is equivalent to Figure 1 A top view. Figure 7 The battery monitoring device 70 is omitted from the text.

[0117] like Figure 7 , Figure 8 , Figure 9 As shown, in differential pair wiring, the vertical relationship between the positive and negative wiring sections in the stacking direction is partially interchanged. For example, the eighth negative wiring section 308n includes an upper wiring 31 and a lower wiring 32. Similarly, the ninth positive wiring section 309p includes an upper wiring 31 and a lower wiring 32.

[0118] In the two wiring sections 308n and 309p, the upper wiring 31 and the lower wiring 32 are partially interchanged via the conductor 33 and the bypass wiring section 35. Starting from the eighth cell 18 side, the eighth negative electrode wiring section 308n interchanges the upper and lower wiring in the order of lower wiring 32, upper wiring 31, lower wiring 32, upper wiring 31. Starting from the eighth cell 18 side, the ninth positive electrode wiring section 309p interchanges the upper and lower wiring in the order of upper wiring 31, lower wiring 32, upper wiring 31, lower wiring 32.

[0119] Furthermore, in the differential pair wiring, the vertical relationship is preferably swapped every time the distance spans an even-numbered cell from the end. Alternatively, the vertical relationship is preferably swapped every two cells.

[0120] like Figure 10 As shown, the differential wiring adopts the following example: at the end on the circuit board 50 side, the positive wiring portions 303p to 309p are composed of lower layer wiring 32, and the negative wiring portions 302n to 308n are composed of upper layer wiring 31. Furthermore, the positive wiring portion 302p is composed of upper layer wiring 31, and the negative wiring portion 301n is composed of lower layer wiring 32. However, it is also possible that at the end of the flexible substrate 30 on the circuit board 50 side, the positive wiring portion 302p is composed of lower layer wiring 32, and the negative wiring portion 301n is composed of upper layer wiring 31.

[0121] The second embodiment achieves the same effect as the first embodiment. Furthermore, the differential pair wiring of the flexible substrate 30 constitutes twisted-pair wiring. Therefore, the flexible substrate 30 can further reduce noise in the differential pair wiring.

[0122] That is, in the positive and negative wiring sections that constitute the differential pair wiring, magnetic flux passes between the two wiring sections, allowing current to flow. However, the direction of this current reverses between adjacent sections where the vertical relationship is interchanged. Therefore, the currents cancel each other out. As a result, the electrical signal flowing through the differential pair wiring is not easily affected by external factors.

[0123] Furthermore, the magnetic flux generated by the electrical signal flowing through the differential pair wiring reverses between adjacent locations where the vertical relationships are interchanged. Therefore, these magnetic fluxes cancel each other out. Consequently, the flexible substrate 30 is less prone to emitting noise to the outside due to the electrical signal flowing through the differential pair wiring.

[0124] The battery monitoring device 70 is connected to each battery cell 11 to 18 via the flexible substrate 30. Therefore, the battery monitoring device 70 can measure the complex impedance in the following state: the state after the influence of induced noise entering the positive electrode wiring section 302p to 309p and the negative electrode wiring section 301n to 308n has been further reduced.

[0125] (Third implementation method)

[0126] use Figures 11-14 The battery device according to the third embodiment will be described. In the third embodiment, the parts that differ from those in the first embodiment will be mainly described. In the third embodiment, the flexible substrate 30 is different from that in the first embodiment. The constituent elements of the flexible substrate 30 in the third embodiment are the same as those in the first embodiment, but the arrangement of the wiring 3 is different from that in the first embodiment. Figure 11 It is equivalent to Figure 1 A top view. Figure 11 The battery monitoring device 70 is omitted from the text.

[0127] like Figure 11 , Figure 12 , Figure 13 As shown, the positive electrode wiring portions 302p to 309p and the negative electrode wiring portions 301n to 308n of the flexible substrate 30 do not overlap in the lamination direction. That is, in the differential pair wiring, the positive electrode wiring portions and the negative electrode wiring portions are arranged in an offset positional relationship in the width direction orthogonal to the thickness direction of the substrate 34. For example, the positive electrode wiring portion 309p and the negative electrode wiring portion 308n are in an offset positional relationship in the width direction. Therefore, the positive electrode wiring portions and the negative electrode wiring portions constituting the differential pair wiring are opposite each other and parallel in an inclined positional relationship.

[0128] In addition, such as Figure 14 As shown, in the differential pair wiring, at the end on the circuit board 50 side, the positive wiring portions 302p to 309p are composed of upper layer wiring 31, and the negative wiring portions 301n to 308n are composed of lower layer wiring 32.

[0129] Furthermore, the width direction is consistent with the long side direction of each battery cell 11 to 18. Alternatively, the width direction can also be described as the direction orthogonal to the thickness direction of the substrate 34 and the arrangement direction of the multiple battery cells 11 to 18.

[0130] The third embodiment can achieve the same effect as the first embodiment.

[0131] (Fourth Implementation)

[0132] use Figures 15-18 The battery device according to the fourth embodiment will be described. In the fourth embodiment, the differences from the second embodiment will be mainly explained. In the fourth embodiment, the flexible substrate 30 differs from that in the second embodiment. The constituent elements of the flexible substrate 30 in the fourth embodiment are the same as those in the second embodiment, but the arrangement of the wiring 3 differs from that in the second embodiment. Figure 15 It is equivalent to Figure 1 A top view. Figure 15 The battery monitoring device 70 is omitted from the text.

[0133] like Figure 15 , Figure 16 , Figure 17 As shown, in the differential pair wiring, the positive electrode wiring portion and the negative electrode wiring portion are arranged in an offset positional relationship in the width direction orthogonal to the thickness direction of the substrate 34. Furthermore, in the differential pair wiring, the vertical relationship between the positive electrode wiring portion and the negative electrode wiring portion in the stacking direction is partially interchanged. That is, it can be said that the fourth embodiment is a combination of the second embodiment and the third embodiment. Therefore, each differential pair wiring of the flexible substrate 30 constitutes a twisted pair wiring.

[0134] For example, the eighth negative electrode wiring section 308n includes an upper layer wiring 31 and a lower layer wiring 32. Similarly, the ninth positive electrode wiring section 309p includes an upper layer wiring 31 and a lower layer wiring 32. Moreover, in the upper layer wiring 31, a portion of the ninth positive electrode wiring section 309p is alternately arranged with a portion of the eighth negative electrode wiring section 308n. In the lower layer wiring 32, a portion of the ninth positive electrode wiring section 309p is alternately arranged with a portion of the eighth negative electrode wiring section 308n.

[0135] like Figure 18 As shown, the differential pair wiring at the end on the circuit board 50 side is configured in the same way as in the second embodiment. However, it is also possible that at the end of the flexible substrate 30 on the circuit board 50 side, the positive electrode wiring portion 302p is composed of the lower layer wiring 32, and the negative electrode wiring portion 301n is composed of the upper layer wiring 31.

[0136] The fourth embodiment can achieve the same effect as the second and third embodiments.

[0137] (Fifth Implementation)

[0138] use Figure 19 The battery device according to the fifth embodiment will be described. In the fifth embodiment, the differences from the first embodiment will be mainly explained. In the fifth embodiment, the battery monitoring IC 40 differs from that in the first embodiment. Figure 19 It is equivalent to Figure 6 The circuit diagram.

[0139] The battery monitoring IC 40 has a shared first ADC 41 for adjacent conversion circuits. That is, one first ADC 41 is provided for each of two adjacent battery cells. In addition, similar to the first embodiment, the first ADC 41 is connected to the complex impedance measurement circuit 43 and the first voltage measurement circuit 44. On the other hand, the second ADC 42 is connected to the second voltage measurement circuit 45.

[0140] For example, a first ADC 41 corresponds to battery cell 10m and battery cell 10m+1. The target cells of this first ADC 41 are battery cell 10m and battery cell 10m+1. Additionally, another first ADC 41 corresponds to battery cell 10m-1 and battery cell 10m-2. The target cells of this first ADC 41 are battery cell 10m-1 and battery cell 10m-2.

[0141] Therefore, battery cells 10m+1 and 10m-1 are connected to a second ADC 42 and a first ADC 41. When monitoring for faults in battery cells 10m+1 and 10m-1, the control circuit 48 compares the measurement results of the first voltage measurement circuit 44 with the measurement results of the second voltage measurement circuit 45.

[0142] On the other hand, battery cell 10m and battery cell 10m-2 are connected to two first ADCs 41. When monitoring for faults in battery cell 10m and battery cell 10m-2, the control circuit 48 compares the measurement result of the first voltage measuring circuit 44 of one side with the measurement result of the first voltage measuring circuit 44 of the other side.

[0143] Alternatively, in this embodiment, ADCs 41 and 42 with different conversion frequencies can also be used. For example, among the ADCs 41 and 42 corresponding to battery cells 10m+1 and 10m-1, the first ADC 41 is a first low-frequency circuit, and the second ADC 42 is a second high-frequency circuit. Among the ADCs 41 and 42 corresponding to battery cells 10m and 10m-2, the shared first ADC 41 is a first low-frequency circuit, and the other's first ADC 41 is a first high-frequency circuit. However, the conversion frequencies of the first ADC 41 and the second ADC 42 can also be the same.

[0144] Thus, the battery monitoring IC 40 includes a first ADC 41 configured in a shared manner for two battery cells. Therefore, the shared first ADC 41 is connected to the battery cells via a multiplexer (MUX) 49. The multiplexer 49 is controlled by control circuitry 48. Therefore, the shared first ADC 41 is selectively connected to the two battery cells.

[0145] The third embodiment achieves the same effect as the first embodiment. Furthermore, compared to the first embodiment, the third embodiment reduces the number of first ADCs 41. Additionally, the fifth embodiment can be implemented in combination with the second to fourth embodiments and the seventh embodiment.

[0146] (Sixth Implementation Method)

[0147] use Figure 20 The battery device according to the sixth embodiment will be described. In the sixth embodiment, the differences from the first embodiment will be mainly explained. In the sixth embodiment, the battery monitoring IC 40 differs from that in the first embodiment. Figure 20 It is equivalent to Figure 6 The circuit diagram.

[0148] The first ADC 41 has a higher conversion frequency than the second ADC 42. Furthermore, all first ADCs 41 have the same conversion frequency.

[0149] In addition, such as Figure 20As shown, the battery monitoring device 70 includes a fifth terminal 93 in addition to the third terminal 91 and the fourth terminal 92. The fifth terminal 93 is a terminal for connecting the battery monitoring IC 40 and the circuit board 50. Additionally, the fifth terminal 93 is a terminal for the second ADC 42.

[0150] Although the number of terminals in the battery monitoring device 70 is increased compared to the first embodiment, it is similar to the first embodiment in that it can output the battery voltage for complex impedance measurement with reduced noise from the first ADC 41. Furthermore, the sixth embodiment can be implemented in combination with the second to fourth embodiments and the seventh embodiment.

[0151] (Seventh Implementation)

[0152] use Figure 21 The battery device according to the seventh embodiment will be described. In the seventh embodiment, the parts that differ from those in the first embodiment will be mainly described. In the seventh embodiment, the flexible substrate 30 differs from that in the first embodiment. Figure 21 It is equivalent to Figure 4 The circuit diagram.

[0153] like Figure 21 As shown, similarly to the first embodiment, multiple differential pair wirings are arranged in a width direction orthogonal to the thickness direction of the substrate 34. Furthermore, the widths of the positive and negative wiring portions of adjacent differential pair wirings are different. For example, the differential pair wiring connected to even-numbered battery cells has a wider wiring width than the differential pair wiring connected to odd-numbered battery cells. Alternatively, the differential pair wiring connected to odd-numbered battery cells has a wider wiring width than the differential pair wiring connected to even-numbered battery cells.

[0154] The seventh embodiment achieves the same effect as the first embodiment. Furthermore, in equalizing capacitance deviations, the flexible substrate 30 causes the current-flowing wiring to alternate. Therefore, by widening the wiring width as described above, the flexible substrate 30 is expected to increase the allowable current and reduce resistance. Additionally, the seventh embodiment can be implemented in combination with the second to fourth embodiments.

[0155] While this disclosure has described embodiments, it should be understood that this disclosure is not limited to these embodiments or structures. This disclosure also includes various modifications and equivalent variations. Furthermore, although this disclosure discloses various combinations and methods, other combinations and methods containing only one element, more elements, or fewer elements also fall within the scope and concept of this disclosure.

[0156] (Disclosure of technical concepts)

[0157] This specification discloses several technical concepts as listed below. Some claims are sometimes set in a multiple dependent form, where a later claim alternatively references an earlier claim. Furthermore, some claims are sometimes set in a multiple dependent form, referring to another multiple dependent form. These claims set in multiple dependent forms define multiple technical concepts.

[0158] (Technical Concept 1)

[0159] A wiring substrate, It is a wiring board that connects to the positive terminals (11p-18p) and negative terminals (11n-18n) of multiple battery cells (11-18), including: Electrically insulating substrate (34); and Wiring (3), which has patterned wiring (31, 32) stacked via the substrate and interlayer connecting members (33) electrically connecting the patterned wiring of different layers. The wiring includes multiple pairs of wiring sections. The paired wiring section consists of a positive electrode wiring section (302p to 309p) connected to the positive terminal of each battery cell and a negative electrode wiring section (301n to 308n) connected to the negative terminal of each battery cell. In the paired wiring section, the positive wiring section and the negative wiring section are arranged in parallel.

[0160] (Technical Concept 2)

[0161] According to the wiring substrate of technical concept 1, in the paired wiring portions, the positive wiring portion and the negative wiring portion are disposed on different layers via the substrate.

[0162] (Technical Concept 3)

[0163] According to the wiring substrate described in technical concept 2, in the paired wiring portions, the vertical relationship between the positive wiring portion and the negative wiring portion in the stacking direction is partially interchanged.

[0164] (Technical Concept 4)

[0165] According to the wiring substrate described in technical concept 3, in the paired wiring portions, the vertical relationship is interchanged every time the distance spanned by the battery cell with an even-numbered sequence number starting from the end is crossed.

[0166] (Technical Concept 5)

[0167] According to any one of technical concepts 2 to 4, in the paired wiring portions, the positive electrode wiring portion and the negative electrode wiring portion are arranged opposite to each other in the thickness direction of the substrate.

[0168] (Technical Concept 6)

[0169] According to any one of technical concepts 2 to 4, in the paired wiring portions, the positive wiring portion and the negative wiring portion are arranged in an offset positional relationship in the width direction orthogonal to the thickness direction of the substrate.

[0170] (Technical Concept 7)

[0171] According to any one of technical concepts 1 to 6, the wiring substrate comprises a plurality of said paired wiring portions arranged in a width direction orthogonal to the thickness direction of the substrate, wherein the widths of the positive wiring portions and the negative wiring portions of adjacent said paired wiring portions are different.

[0172] (Technical Concept 8)

[0173] According to any one of technical concepts 1 to 7, the wiring substrate includes shared wiring that is connected in a common manner to two adjacent battery cells among the plurality of battery cells. The common wiring is connected to the positive terminal of one of the two battery cells and the negative terminal of the other battery cell, and branches to the positive and negative wiring portions of different paired wiring portions.

[0174] (Technical Concept 9)

[0175] A battery device, The battery device includes: a plurality of battery cells (11-18); a wiring board (30) connected to the plurality of battery cells; and a battery monitoring device (40, 50) connected to the wiring board and monitoring the battery cells. Each battery cell includes a positive terminal (11p~18p) and a negative terminal (11n~18n). The wiring substrate includes: Electrically insulating substrate (34); and Wiring (3) having patterned wiring (31, 32) stacked via the substrate and interlayer connecting members (33) electrically connecting the patterned wiring of different layers, and connected to the positive terminal and the negative terminal. The wiring includes multiple pairs of wiring sections. The paired wiring section consists of a positive electrode wiring section (302p to 309p) connected to the positive terminal of each battery cell and a negative electrode wiring section (301n to 308n) connected to the negative terminal of each battery cell. The battery monitoring device includes a battery monitoring circuit and a circuit board. The battery monitoring circuit has the following features: Multiple first conversion circuits (41), connected to the positive and negative terminals of each battery cell, convert analog signals into digital signals and output electrical signals for measuring the complex impedance of each battery cell; and Multiple second conversion circuits (42), connected to the positive and negative terminals of each battery cell, convert analog signals into digital signals and output electrical signals for state detection of each battery cell. The circuit board has terminal pairs (60a) that are connected to each first conversion circuit and the corresponding battery cell, i.e., the target cell. The paired wiring section is connected to the terminal pair, and the positive wiring section and the negative wiring section are arranged in parallel.

Claims

1. A wiring substrate, It is a wiring board that connects to the positive terminals (11p-18p) and negative terminals (11n-18n) of multiple battery cells (11-18), including: Electrically insulating substrate (34); as well as Wiring (3), which has patterned wiring (31, 32) stacked via the substrate and interlayer connecting member (33) electrically connecting the patterned wiring of different layers. The wiring includes multiple pairs of wiring sections. The paired wiring section consists of a positive electrode wiring section (302p to 309p) connected to the positive terminal of each battery cell and a negative electrode wiring section (301n to 308n) connected to the negative terminal of each battery cell. In the paired wiring section, the positive wiring section and the negative wiring section are arranged in parallel.

2. The wiring substrate according to claim 1, characterized in that, In the paired wiring section, the positive wiring section and the negative wiring section are disposed on different layers via the substrate.

3. The wiring substrate according to claim 2, characterized in that, In the paired wiring section, the vertical relationship between the positive wiring section and the negative wiring section in the stacking direction is partially interchanged.

4. The wiring substrate according to claim 3, characterized in that, In the paired wiring section, the vertical relationship is interchanged every time the distance spanned by the even-numbered battery cell starting from the end is crossed.

5. The wiring substrate according to any one of claims 2 to 4, characterized in that, In the paired wiring section, the positive electrode wiring section and the negative electrode wiring section are arranged opposite to each other in the thickness direction of the substrate.

6. The wiring substrate according to any one of claims 2 to 4, characterized in that, In the paired wiring section, the positive wiring section and the negative wiring section are arranged in an offset positional relationship in the width direction orthogonal to the thickness direction of the substrate.

7. The wiring substrate according to claim 1, characterized in that, The plurality of the paired wiring portions are arranged in a width direction orthogonal to the thickness direction of the substrate, and the positive and negative wiring portions of adjacent paired wiring portions have different widths.

8. The wiring substrate according to claim 1, characterized in that, The wiring includes shared wiring that connects to two adjacent battery cells in a shared manner among the plurality of battery cells. The common wiring is connected to the positive terminal of one of the two battery cells and the negative terminal of the other battery cell, and branches to the positive and negative wiring portions of different paired wiring portions.

9. A battery device, The battery device includes: Multiple battery cells (11-18); a wiring board (30) connected to the multiple battery cells; and a battery monitoring device (40, 50) connected to the wiring board and monitoring the battery cells. Each battery cell includes a positive terminal (11p~18p) and a negative terminal (11n~18n). The wiring substrate includes: Electrically insulating substrate (34); and Wiring (3) having patterned wiring (31, 32) stacked via the substrate and interlayer connecting members (33) electrically connecting the patterned wiring of different layers, and connected to the positive terminal and the negative terminal. The wiring includes multiple pairs of wiring sections. The paired wiring section consists of a positive electrode wiring section (302p to 309p) connected to the positive terminal of each battery cell and a negative electrode wiring section (301n to 308n) connected to the negative terminal of each battery cell. The battery monitoring device includes a battery monitoring circuit and a circuit board. The battery monitoring circuit has the following features: Multiple first conversion circuits (41), connected to the positive and negative terminals of each battery cell, convert analog signals into digital signals and output electrical signals for measuring the complex impedance of each battery cell; and Multiple second conversion circuits (42), connected to the positive and negative terminals of each battery cell, convert analog signals into digital signals and output electrical signals for state detection of each battery cell. The circuit board has terminal pairs (60a) that are connected to each first conversion circuit and the battery cell, i.e., the target cell, corresponding to each first conversion circuit. The paired wiring section is connected to the terminal pair, and the positive wiring section and the negative wiring section are arranged in parallel.

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