Voltage measurement board and power storage system

Abstract

To provide a highly versatile circuit board for voltage measurement.SOLUTION: A circuit board for voltage measurement has a predetermined m voltage measurement units. The m voltage measurement units severally comprise: (N+1) connection ports which are arranged in order for a predetermined cell series number N; a plurality of voltage measuring wires which severally extend from the (N+1) connection ports; and a voltage measuring device which is connected to a pair of voltage measuring wires extended from adjacent connection ports of the (N+1) connection ports, and measures a voltage between the adjacent connection ports. At least one voltage measurement unit of the m voltage measurement units comprises: a branch wiring branching from at least one voltage measuring wire of the plurality of voltage measuring wires; and a branch connection port connected to the branch wiring. m denotes an integer of 1 or more, and N denotes an integer of 2 or more.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a voltage measurement substrate and a power storage system. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2010-80135 discloses a vehicle battery system including a battery block and a battery state detection circuit that detects the state of each battery that constitutes the battery block. Electronic components that implement the battery state detection circuit are fixed to one side of a circuit board. The circuit board faces the terminal plane of the battery block. Electronic components are arranged on the side opposite the side facing the terminal plane. The positive and negative electrode terminals of each battery cell are connected to the battery state detection circuit via the circuit board. This battery system is said to be able to detect battery voltage with high accuracy. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-80135 Summary of the Invention [Problem to be solved by the invention]

[0004] The configuration of the cell module varies depending on the intended use, required power, etc. The present inventors wish to provide a highly versatile voltage measurement substrate. [Means for solving the problem]

[0005] The voltage measurement board disclosed herein has a predetermined number m of voltage measurement units. Each of the m voltage measurement units includes (N+1) connection ports arranged in order corresponding to the predetermined number N of serially connected cells, a plurality of voltage measurement lines extending from each of the (N+1) connection ports, and a voltage measuring device connected to a pair of voltage measurement lines extending from adjacent ones of the (N+1) connection ports to measure the voltage between the adjacent connection ports. Of the m voltage measurement units, at least one voltage measurement unit includes a branch wiring branching from at least one of the plurality of voltage measurement lines and a branch connection port connected to the branch wiring. m is an integer greater than or equal to 1, and N is an integer greater than or equal to 2. This voltage measurement board is highly versatile and can measure the voltages of various cell modules. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram of a voltage measurement substrate 20A. [Figure 2] FIG. 2 is a schematic diagram showing an example of use of the voltage measurement board 20A. [Figure 3] FIG. 3 is a schematic diagram showing an example of use of the voltage measurement board 20A. [Figure 4] FIG. 4 is a schematic diagram showing the power storage system 1. As shown in FIG. [Figure 5] FIG. 5 is a schematic diagram showing the power storage system 2. As shown in FIG. [Figure 6] FIG. 6 is a schematic diagram showing the power storage system 3. As shown in FIG. [Figure 7] FIG. 7 is a schematic diagram showing the power storage system 4. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0007] An embodiment of the technology disclosed herein will be described below with reference to the drawings. The embodiment described here is, of course, not intended to limit the present invention. The drawings are schematic and do not necessarily reflect the actual product. Furthermore, the same reference numerals are appropriately used for components and parts that perform the same function, and redundant explanations will be omitted where appropriate.

[0008] The present inventors have considered monitoring the cell voltages via a voltage measurement board for measuring the cell voltages of a plurality of cell modules.

[0009] Here, a "cell" refers to a device that is the smallest unit of an electricity storage device that can be repeatedly charged and discharged. A "cell module" is a component that combines multiple cells and has the integrated function of an electricity storage device. Here, an "electricity storage device" refers to a device that can be repeatedly charged and discharged, and is a concept that encompasses so-called storage batteries (i.e., chemical batteries) such as lithium-ion secondary batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, as well as capacitors (i.e., physical batteries) such as electric double-layer capacitors.

[0010] <Voltage measurement board> The voltage measurement board proposed here is a board for monitoring the cell voltages of a plurality of cell modules.

[0011] FIG. 1 is a schematic diagram of a voltage measurement board 20A. FIG. 1 shows an example of a voltage measurement board that the present inventors are currently studying. Note that, in order to simplify the configuration of the voltage measurement board, FIG. 1 illustrates a voltage measurement board to which two cell modules 10 and 11 are connected. In FIG. 1, the two cell modules 10 and 11 each have four cells c1 to c4 and c5 to c8. Note that, for ease of explanation, a cell module incorporating four cells is illustrated here, but in reality, the number of cells included in each cell module is not limited to four. Each cell module may include more cells, such as eight or ten cells.

[0012] As shown in FIG. 1, cells c1 to c4 of cell module 10 and cells c5 to c8 of cell module 11 are connected in series. The two cell modules 10, 11 are connected in series via a bus bar 18. Five connection ports ap1 to ap5 are provided in cell module 10 for acquiring the potentials across the two terminals of cells c1 to c4 and the inter-cell potential so that the cell voltages of each of cells c1 to c4 can be obtained. Similarly, five connection ports bp1 to bp5 are provided in cell module 11 for acquiring the potentials across the two terminals of cells c5 to c8 and the inter-cell potential. To prevent voltage drops due to the resistance of bus bar 18 from being measured, connection port ap5 and connection port bp1 are provided before and after bus bar 18.

[0013] The voltage measurement board 20A has voltage measurement units 30A and 30B corresponding to the cell modules 10 and 11, respectively. The voltage measurement unit 30A has five connection ports sp1 to sp5 corresponding to the five connection ports ap1 to ap5 of the cell module 10. The voltage measurement unit 30A has four voltage meters v1 to v4 for obtaining the cell voltages of the cells c1 to c4 of the cell module 10. The voltage measurement unit 30B has five connection ports tp1 to tp5 corresponding to the five connection ports bp1 to bp5 of the cell module 11. The voltage measurement unit 30B has four voltage meters v5 to v8 for obtaining the cell voltages of the cells c5 to c8 of the cell module 11.

[0014] 1, according to this voltage measurement board 20A, the five connection ports ap1 to ap5 of the cell module 10 and the five connection ports bp1 to bp5 of the cell module 11 are preferably connected in series to the ten connection ports sp1 to sp5, tp1 to tp5 of the voltage measurement units 30A and 30B, respectively. This allows the cell voltages of the cells c1 to c8 of the cell modules 10 and 11 to be obtained.

[0015] The number of cells incorporated into one cell module may vary depending on the product. FIG. 2 is a schematic diagram illustrating an example of use of the voltage measurement board 20A. FIG. 2 illustrates an example of use of the voltage measurement board 20A when eight cells c1 to c8 are incorporated into one cell module 12. In this case, as shown in FIG. 2, the cell module 12 incorporates eight cells c1 to c8 connected in series. Eight voltage measuring devices v1 to v8 are incorporated into the voltage measurement board 20A. Therefore, the voltage measurement board 20A can be used to measure the cell voltages of the eight cells c1 to c8 of the cell module 12. In this case, the cell module 12 is provided with nine connection ports cp1 to cp9 to acquire the potentials across the cells c1 to c8 and the inter-cell potential. In contrast, the voltage measurement board 20A has ten connection ports sp1 to sp5, tp1 to tp5, which makes simple wiring impossible. Therefore, as shown in Figure 2, for example, a method is conceivable in which a connection line is branched from the connection port cp5 for acquiring the inter-cell potential between cells c4 and c5 and connected to sp5 and tp1 of the voltage measurement board 20A. In this case, the creation of a branching section for branching the connection line makes the wiring work complicated. Furthermore, there is a risk of connection problems, such as a disconnection at the branching section.

[0016] FIG. 3 is a schematic diagram showing an example of how the voltage measurement board 20A is used. FIG. 3 illustrates an example of how the voltage measurement board 20A is used when six cells c1 to c6 are installed in one cell module 13. In this case, as shown in FIG. 3, the cell module 13 is installed with the six cells c1 to c6 connected in series. The cell module 13 is provided with seven connection ports dp1 to dp7 for acquiring the potentials across the cells c1 to c6 and the inter-cell potential so that the cell voltages of each cell c1 to c6 can be obtained. Eight voltage meters v1 to v8 are installed in the voltage measurement board 20A. Therefore, the voltage meters v1 to v8 are excessive compared to the number of cells c1 to c6 included in the cell module 13. Here, voltage meters v1 to v4, v7, and v8 are used to measure the voltages of cells c1 to c6. Voltage meters v5 and v6 are not used to measure the voltages of cells c1 to c6. The connection ports tp1 to tp3 connected to voltage measuring devices v5 and v6 that are not used for voltage measurement are not left open in order to stabilize the voltage signals input to the voltage measurement board 20A. Here, a connection line branches from the connection port dp5 and is connected to the connection ports sp5 and tp1 to tp3. Even in this case, the creation of a branch point where the connection line branches makes the wiring work complicated. Furthermore, there is a risk of connection problems, such as a break at the branch point.

[0017] The voltage measurement board 20 disclosed herein will be described below together with the electricity storage system 1 including the voltage measurement board 20.

[0018] <Energy Storage System 1> Fig. 4 is a schematic diagram showing a power storage system 1. As shown in Fig. 4, the power storage system 1 includes a cell module 12, a voltage measurement board 20, connection lines f1 to f9, and a board connection line g1. In the cell module 12, eight cells c1 to c8 are connected in series. In addition to the plurality of cells c1 to c8 connected in series, the cell module 12 may also include a cell connected in parallel to one or more cells. The connection lines f1 to f9 are wiring that connect the cell module 12 and the voltage measurement board 20.

[0019] <Voltage measurement board 20> The voltage measurement board 20 has two voltage measurement units 30, 31. The voltage measurement board 20 measures the voltage of each of the cells c1 to c8 included in the cell module 12. The number of voltage measurement units is not limited to two and may be determined in advance depending on the number of cell modules, the number of cells, etc. The voltage measurement units 30, 31 are each configured to measure the cell voltage of a cell module in which four cells are connected in series (for example, the cell modules 10, 11 shown in FIG. 1).

[0020] <Voltage measurement units 30, 31> Voltage measurement unit 30 includes connection ports sp1 to sp5, voltage measurement lines s1 to s5, and voltage meters v1 to v4. Similarly, voltage measurement unit 31 includes connection ports tp1 to tp5, voltage measurement lines t1 to t5, and voltage meters v5 to v8. Voltage meters v1 to v8 measure the voltage between adjacent connection ports. Voltage meters v1 to v8 may be realized, for example, by a voltage measurement circuit including a voltage sensor.

[0021] In the voltage measurement units 30 and 31, connection ports sp1 to sp5 and tp1 to tp5 are provided one more than the predetermined number of cells connected in series (four in this embodiment). The connection ports sp1 to sp5 and tp1 to tp5 are arranged in order with respect to the cells c1 to c8 connected in series.

[0022] Voltage measurement lines s1 to s5 and t1 to t5 extend from connection ports sp1 to sp5 and tp1 to tp5, respectively. Voltage measuring devices v1 to v4 are each connected to a pair of adjacent voltage measurement lines among the voltage measurement lines s1 to s5. Similarly, voltage measuring devices v5 to v8 are each connected to a pair of adjacent voltage measurement lines among the voltage measurement lines t1 to t5.

[0023] In this embodiment, of the voltage measurement units 30 and 31, the voltage measurement unit 30 includes a branch wiring x1 and a branch connection port xp1 connected to the branch wiring x1. The branch wiring x1 branches off from the voltage measurement line s5 of the voltage measurement lines s1 to s5. The voltage meters v1 to v4 of the voltage measurement unit 30 and the voltage meters v5 to v8 of the voltage measurement unit 31 are each configured to measure one cell voltage.

[0024] In this way, to measure the voltage of a cell module in which two or more cells are connected in series, the voltage measurement board can be provided with voltage measurement units corresponding to the number of cell modules. The voltage measurement units can include voltage meters corresponding to the number of series-connected cells included in the cell module. In this way, the voltage measurement board can be designed according to the cell module to be measured and the number of cells included in the cell module.

[0025] In this embodiment, the cell module 12 has eight cells c1 to c8 connected in series. Connection lines f1 to f9 extend from the positive and negative sides of the cells c1 to c8. The connection lines f1 to f9 are connected to nine connection ports cp1 to cp9 of the cell module 12, respectively.

[0026] Ten connection ports sp1 to sp5, tp1 to tp5 are provided in the voltage measurement units 30, 31 of the voltage measurement board 20. Therefore, the connection ports sp1 to sp5, tp1 to tp5 of the voltage measurement board 20 are one extra port for each of the connection ports cp1 to cp9 of the cell module 12.

[0027] In this embodiment, the connection lines f1 to f9 are connected to the connection ports sp1 to sp5 and tp2 to tp5 of the voltage measurement board 20. The voltage measuring devices v1 to v4 measure the cell voltages of the cells c1 to c4. The voltage measuring devices v6 to v8 measure the cell voltages of the cells c6 to c8. The connection port tp1 is connected to the branch connection port xp1 via the board connection line g1. In this way, the board connection line g1 connects the connection port tp1, which is one of the connection ports sp1 to sp5 and tp1 to tp5 to which the connection lines f1 to f9 are not connected, to the branch connection port xp1. Therefore, the potential of the connection port tp1 on the negative side of the voltage measuring device v5 is the same as the potential of the connection port sp5 on the positive side of the voltage measuring device v4. As a result, the voltage measuring device v5 measures the voltage of the cell c5.

[0028] In the above-described embodiment, as shown in FIG. 4, the voltage measurement board 20 has two voltage measurement units 30 and 31. Each of the two voltage measurement units 30 and 31 has five connection ports sp1 to sp5 and tp1 to tp5, five voltage measurement lines s1 to s5 and t1 to t5, and voltage meters v1 to v4 and v5 to v8. The five connection ports sp1 to sp5 and tp1 to tp5 are arranged in order of the number of series-connected cells, which is four. The five voltage measurement lines s1 to s5 and t1 to t5 extend from the five connection ports sp1 to sp5 and tp1 to tp5, respectively. The voltage meters v1 to v4 and v5 to v8 are connected to pairs of voltage measurement lines extending from adjacent connection ports among the five connection ports. Each of the voltage meters v1 to v4 and v5 to v8 measures the voltage between the adjacent connection ports. Of the two voltage measurement units 30, 31, one voltage measurement unit 30 includes a branch wiring x1 branching off from one voltage measurement line s5 of the five voltage measurement lines s1 to s5, and a branch connection port xp1 connected to the branch wiring x1.

[0029] The voltage measurement board 20 can measure the voltages of each cell in two cell modules 10 and 11 (see FIG. 1), each having four cells c1 to c4 and c5 to c8, using wiring similar to that of the embodiment shown in FIG. 1. The voltage measurement board 20 can also be applied to cell modules with different configurations. As shown in FIG. 4, the cell module 12 has eight cells c1 to c8 connected in series. For this cell module 12, the voltages of each cell can be measured without any wiring process on the connection wires. Thus, the voltage measurement board 20 can accommodate multiple cell module configurations, such as the cell modules 10 and 11 (see FIG. 1) and the cell module 12 (see FIG. 4), and is highly versatile. Furthermore, the board connection wire g1 can be easily attached and detached to the connection port tp1 and the branch connection port xp1, eliminating the need for additional wiring process. Furthermore, because the branch wiring is branched within the voltage measurement board, the connection is more reliable than when the wiring is processed on the connection line, and the cell voltages are more likely to be detected stably by the voltage measuring devices v1 to v8.

[0030] The above-described power storage system 1 also includes cell modules 12 each having eight cells c1 to c8, a voltage measurement board 20, and a plurality of connection wires f1 to f9 and a board connection wire g1 connecting the cell modules 12 and the voltage measurement board 20. The connection wires f1 to f9 extend from the positive and negative sides of each of the eight cells. The connection wires f1 to f9 are connected to connection ports sp1 to sp5 and tp2 to tp5, respectively, among the connection ports sp1 to sp5 and tp1 to tp5. The board connection wire g1 connects the connection port tp1, among the connection ports sp1 to sp5 and tp1 to tp5, to which the connection wires f1 to f9 are not connected, to the branch connection port xp1. In the power storage system 1, the board connection wire g1 branches off within the above-described voltage measurement board 20. This eliminates the need for wiring connections on the connection wires f1 to f9, thereby improving the long-term reliability of the power storage system 1.

[0031] The voltage measurement board disclosed herein is not limited to the voltage measurement board 20 described above, and various modifications are possible. The configuration of the voltage measurement board is set appropriately depending on the number of cell modules to be measured, the number of cells connected in series contained in the cell modules, etc. The voltage measurement board disclosed herein is applicable when the number of cell modules to be measured (number of voltage measurement units) is one or more. The voltage measurement board disclosed herein is applicable when the number of cells connected in series is two or more. The number of branch wiring and branch connection ports and the branching method are not limited to the above-described embodiment. Voltage measurement boards 21, 22, and 23 according to other embodiments will be described below.

[0032] FIG. 5 is a schematic diagram showing a power storage system 2. As shown in FIG. 5, the power storage system 2 includes a cell module 13 and a voltage measurement board 21. The voltage measurement board 21 has voltage measurement units 31 and 32. The voltage measurement unit 31 has the same configuration as the voltage measurement unit 31 shown in FIG. 4. The voltage measurement unit 32, like the voltage measurement unit 30 (see FIG. 4), includes five connection ports sp1 to sp5, five voltage measurement lines s1 to s5, and five voltage meters v1 to v4. The voltage measurement unit 32 includes branch wirings x2 to x4 and branch connection ports xp2 to xp4 connected to the branch wirings x2 to x4. The branch wirings x2 to x4 branch from the voltage measurement line s5. The voltage measurement board 21 and the cell module 13 are connected via connection lines f11 to f17.

[0033] In this embodiment, the cell module 13 has six cells c1 to c6 connected in series. Connection lines f11 to f17 extend from the positive and negative sides of the cells c1 to c6, respectively. The connection lines f11 to f17 are connected to seven connection ports dp1 to dp7 of the cell module 13, respectively. Voltage meters v1 to v4 measure the cell voltages of the cells c1 to c4. Voltage meter v8 measures the cell voltage of cell c6.

[0034] Ten connection ports sp1 to sp5, tp1 to tp5 are provided in the voltage measurement units 31, 32 of the voltage measurement board 21. Therefore, the connection ports sp1 to sp5, tp1 to tp5 of the voltage measurement board 21 are three more than the connection ports dp1 to dp7 of the cell module 13.

[0035] In this embodiment, connection lines f11-f17 are connected to connection ports sp1-sp5, tp4, and tp5 of the voltage measurement board 21. Connection port tp1 is connected to branch connection port xp4 via board connection line g4. Connection port tp2 is connected to branch connection port xp3 via board connection line g3. Connection port tp3 is connected to branch connection port xp2 via board connection line g2. In this way, board connection lines g2-g4 connect connection ports tp1-tp3, among connection ports sp1-sp5 and tp1-tp5, to which connection lines f11-f17 are not connected, to branch connection ports xp2-xp4. The potential from the negative connection port tp1 of voltage measuring device v5 to the positive connection port tp3 of voltage measuring device v6 is the same as the potential at the positive connection port sp5 of voltage measuring device v4. Therefore, voltage measuring device v7 measures the voltage of cell c5. Voltage measuring devices v5 and v6 are not used to measure cell voltages. The connection ports tp1 to tp3 connected to voltage measuring devices v5 and v6 that are not used to measure cell voltages are not left open. This stabilizes the signals input to the voltage measurement board 21.

[0036] In the above-described embodiment, of the two voltage measurement units 31 and 32, the voltage measurement unit 32 includes branch wirings x2 to x4 and branch connection ports xp2 to xp4 connected to the branch wirings x2 to x4. Thus, the voltage measurement unit includes multiple branch wirings and branch connection ports, increasing the flexibility of the configuration of the cell module to be measured. For example, the voltage measurement board 21 can measure the cell voltages of cell modules having seven or eight cells in addition to the cell module 13 having six cells c1 to c6 as shown in FIG. 5. For each cell to be measured, one of the branch wirings x2 to x4 is removed, and a connection line is connected between the connection port from which the branch wiring was removed and the cell connection port. Thus, with the voltage measurement board 21, even when the number of cells to be measured changes, the connection destination can be easily changed by reconnecting the wiring of the branch connection ports xp2 to xp4 without having to perform wiring connections or disconnecting the already-connected connection lines.

[0037] FIG. 6 is a schematic diagram showing a power storage system 3. As shown in FIG. 6, the power storage system 3 includes a cell module 14 and a voltage measurement board 22. The voltage measurement board 22 has voltage measurement units 30, 33, and 34. The voltage measurement unit 30 has the same configuration as the voltage measurement unit 30 shown in FIG. 4. Like the voltage measurement unit 30, the voltage measurement units 33 and 34 include five connection ports tp1 to tp5, and up1 to up5, voltage measurement lines t1 to t5, and u1 to u5, and voltage measuring instruments v5 to v8, and v9 to v12. The voltage measurement unit 30 includes a branch wiring x1 and a branch connection port xp1 connected to the branch wiring x1. The branch wiring x1 branches off from the voltage measurement line s5. The voltage measurement unit 33 includes a branch wiring x5 and a branch connection port xp5 connected to the branch wiring x5. The branch wiring x5 branches off from the voltage measurement line t5. The voltage measurement board 22 and the cell module 14 are connected via connection lines f21 to f33.

[0038] In this embodiment, the cell module 14 has 12 cells c1 to c12 connected in series. Connection lines f21 to f33 extend from the positive and negative sides of the cells c1 to c12, respectively. The connection lines f21 to f33 are connected to 13 connection ports ep1 to ep13 of the cell module 14, respectively. Voltage meters v1 to v4 measure the cell voltages of cells c1 to c4. Voltage meters v6 to v8 measure the cell voltages of cells c6 to c8. Voltage meters v10 to v12 measure the cell voltages of cells c10 to c12.

[0039] Fifteen connection ports sp1 to sp5, tp1 to tp5, and up1 to up5 are provided in the voltage measurement units 30, 33, and 34 of the voltage measurement board 22. Therefore, the connection ports sp1 to sp5, tp1 to tp5, and up1 to up5 of the voltage measurement board 22 are two more than the connection ports ep1 to ep13 of the cell module 14.

[0040] In this embodiment, connection lines f21 to f33 are connected to connection ports sp1 to sp5, tp2 to tp5, and up2 to up5 of the voltage measurement board 21. Connection port tp1 is connected to branch connection port xp1 via board connection line g1. Connection port up1 is connected to branch connection port xp5 via board connection line g5. In this way, board connection lines g1 and g5 connect connection ports tp1 and up1, among connection ports sp1 to sp5, tp1 to tp5, and up1 to up5 to which connection lines f21 to f33 are not connected, to the branch connection ports xp1 and xp5. Therefore, the potential of the negative connection port tp1 of voltage measuring device v5 is the same as the potential of the positive connection port sp5 of voltage measuring device v4. As a result, the voltage measuring device v5 measures the voltage of cell c5. The potential at the negative connection port up1 of the voltage measuring device v9 becomes the same as the potential at the positive connection port tp5 of the voltage measuring device v8. This allows the voltage measuring device v9 to measure the voltage of cell c9.

[0041] In the above-described embodiment, of the three voltage measurement units 30, 33, and 34, two voltage measurement units 30 and 33 include branch wirings x1 and x5 and branch connection ports xp1 and xp5 connected to the branch wirings x1 and x5. Having multiple voltage measurement units include branch wirings and branch connection ports increases the degree of freedom in wiring the branch wirings. As a result, it is possible to accommodate various cell module configurations, improving the versatility of the voltage measurement board.

[0042] The voltage measurement board disclosed herein is not limited to a configuration having multiple voltage measurement units. FIG. 7 is a schematic diagram showing a power storage system 4. As shown in FIG. 7, the power storage system 4 includes a cell module 13 and a voltage measurement board 23. The voltage measurement board 23 has a voltage measurement unit 35. The voltage measurement unit 35 includes nine connection ports rp1 to rp9, voltage measurement lines r1 to r9, and voltage meters v1 to v8. The voltage measurement unit 35 includes branch wirings x6 and x7 and branch connection ports xp6 and xp7 connected to the branch wirings x6 and x7. The branch wiring x6 branches off from the voltage measurement line r5. The branch wiring x7 branches off from the voltage measurement line r6. The voltage measurement board 23 and the cell module 13 are connected via connection lines f41 to f47.

[0043] The cell module 13 has the same configuration as the cell module 13 shown in FIG. 5. The cell module 13 has six cells c1 to c6 connected in series. Connection lines f41 to f47 extend from the positive and negative sides of the cells c1 to c6, respectively. The connection lines f41 to f47 are connected to seven connection ports dp1 to dp7 of the cell module 13, respectively. The voltage meters v1 to v4 measure the cell voltages of the cells c1 to c4. The voltage meter v8 measures the cell voltage of the cell c6.

[0044] Nine connection ports rp1 to rp9 are provided in the voltage measurement unit 35 of the voltage measurement board 23. Therefore, the connection ports rp1 to rp9 of the voltage measurement board 23 are two more than the connection ports dp1 to dp7 of the cell module 13.

[0045] In this embodiment, the connection lines f41 to f47 are connected to the connection ports rp1 to rp5, rp8, and rp9 of the voltage measurement board 23. The connection port rp6 is connected to the branch connection port xp6 via the board connection line g6. The connection port rp7 is connected to the branch connection port xp7 via the board connection line g7. In this way, the board connection lines g6 and g7 connect the connection ports rp6 and rp7, which are not connected to the connection lines f41 to f47 among the connection ports rp1 to rp9, to the branch connection ports xp6 and xp7. Therefore, the potential of the positive connection ports rp6 and rp7 of the voltage measuring devices v5 and v6 is the same as the potential of the positive connection port rp5 of the voltage measuring device v4. The voltage measuring devices v5 and v6 are not used to measure cell voltages. The connection ports rp5 to rp7 connected to the voltage measuring devices v5 and v6 that are not used to measure cell voltages are not left open. This stabilizes the signals input to the voltage measurement board 23.

[0046] The technology disclosed herein has been described in various ways. Unless otherwise specified, the embodiments described herein do not limit the present invention. For example, a voltage measurement board may include four or more voltage measurement units. When a voltage measurement board includes multiple voltage measurement units, the number of voltage measurement devices does not necessarily have to be the same. The pattern in which branch ports and branch lines are provided is not limited to the above-described form. The number of branch ports and branch lines, and the branching voltage measurement lines, may be selected depending on the configuration of the cell module to be measured. Furthermore, the technology disclosed herein can be modified in various ways, and as long as no particular problems arise, each component and each process described herein can be omitted or combined as appropriate. This specification also includes the disclosures described in the following sections.

[0047] Section 1: A voltage measurement board having a predetermined number m of voltage measurement units, The m voltage measurement units are (N+1) connection ports arranged in order with respect to a predetermined number N of serially connected cells; a plurality of voltage measurement lines respectively extending from the (N+1) connection ports; a voltage measuring device connected to a pair of voltage measurement lines extending from adjacent connection ports among the (N+1) connection ports and measuring a voltage between the adjacent connection ports; Each of them has At least one voltage measurement unit among the m voltage measurement units is a branch wiring branched from at least one of the plurality of voltage measurement lines; a branch connection port connected to the branch wiring; Equipped with where m is an integer of 1 or greater, and N is an integer of 2 or greater. Voltage measurement board.

[0048] Section 2: Item 1. The voltage measurement substrate according to item 1, wherein m is an integer of 2 or more.

[0049] Section 3: Item 3. The voltage measurement board according to item 2, wherein at least one voltage measurement unit among the m voltage measurement units includes one branch wiring and one branch connection port connected to the branch wiring.

[0050] Section 4: m is an integer equal to or greater than 3, Item 3. The voltage measurement board according to item 2, wherein at least two of the m voltage measurement units include the branch wiring and a branch connection port connected to the branch wiring.

[0051] Section 5: Item 3. The voltage measurement board according to item 2, wherein at least one voltage measurement unit among the m voltage measurement units includes a plurality of branch wirings and branch connection ports connected to the branch wirings.

[0052] Item 6: a cell module having L cells; A voltage measurement substrate according to any one of items 1 to 5, a plurality of connection lines connecting the cell module and the voltage measurement substrate; Board connection wire and Equipped with The plurality of connection lines are extending from the positive and negative sides of each of the L cells; and Each of the connection ports is connected to one of the connection ports, The substrate connection line connects the branch connection port to one of the connection ports to which the connection line is not connected. [Explanation of symbols]

[0053] 1-4 Energy storage system 10-14 cell module 18 Bus Bar 20~23 Voltage measurement board 20A voltage measurement board 30~35 Voltage measurement unit 30A, 30B Voltage Measurement Unit Cells c1~c12 ap1~ap5,bp1~bp5,cp1~cp9,dp1~dp7,ep1~ep13 connection ports f1~f47 connecting lines g1~g7 PCB connection wires r1~r9, s1~s5, t1~t5, u1~u5 voltage measurement lines rp1~rp9,sp1~sp5,tp1~tp5,up1~up5 connection ports v1~v12 voltage measuring instrument x1~x7 Branch wiring xp1~xp7 Branch connection ports

Claims

1. A voltage measurement board having a predetermined number m of voltage measurement units, The m voltage measurement units are (N+1) connection ports arranged in order corresponding to a predetermined number N of serially connected cells; a plurality of voltage measurement lines respectively extending from the (N+1) connection ports; N voltage measuring devices each connected to a pair of voltage measurement lines extending from adjacent connection ports among the (N+1) connection ports, and measuring a voltage between the adjacent connection ports; Each of them has At least one voltage measurement unit among the m voltage measurement units is a branch wiring branched from at least one of the plurality of voltage measurement lines; a branch connection port connected to the branch wiring; Equipped with the branch connection port is connected from outside the voltage measurement board to any one of the (N+1) connection ports provided in the m voltage measurement units via a board connection line; Among the (N+1) connection ports, a connection port that is not connected to the branch connection port via the substrate connection line is connected to a connection line extending from a cell to be measured from outside the voltage measurement substrate, Here, m is an integer of 1 or more, and N is an integer of 2 or more. Voltage measurement board.

2. 2. The voltage measurement substrate according to claim 1, wherein m is an integer of 2 or more.

3. 3. The voltage measurement board according to claim 2, wherein at least one of said m voltage measurement units includes one of said branch wirings and one of said branch connection ports connected to said branch wirings.

4. m is an integer of 3 or greater; 3. The voltage measurement board according to claim 2, wherein at least two of said m voltage measurement units comprise said branch wiring and a branch connection port connected to said branch wiring.

5. 3. The voltage measurement board according to claim 2, wherein at least one of said m voltage measurement units comprises a plurality of said branch wirings and branch connection ports connected to said branch wirings.

6. a cell module having L cells; A voltage measurement substrate according to any one of claims 1 to 5; a plurality of connection lines connecting the cell module and the voltage measurement substrate; Board connection wire and Equipped with The plurality of connection lines are extending from the positive and negative sides of each of the L cells; and Each of the connection ports is connected to one of the connection ports, the substrate connection line connects a connection port to which the connection line is not connected among the connection ports to the branch connection port, Here, L is an integer greater than or equal to 2 and less than or equal to m×N. Energy storage system.

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