KR101897049B1 - Apparatus for monitoring cells of a storage module, and program and method for detecting disconnection - Google Patents

Abstract

There is disclosed a technique for detecting disconnection of an electric wire connecting between each of a plurality of unit cells and a cell monitor device by means other than the conventional one.
The cell monitoring unit 70 of the cell monitoring device 71 is configured to control the plurality of switches 21 to 24 connected in parallel through the voltage measuring lines 60 to 64 to each of the plurality of cells 1 to 4, In turn, it turns from off to on and back off. Then, the voltage between a pair of voltage measuring lines connected to each cell is set to a voltage corresponding to the cell voltage of each cell after the switch connected in parallel to the corresponding cell is turned off again and after the above- . When it is judged that the measured cell voltages have at least one of the high-erroneous cell voltage higher than or equal to the first threshold value and the low-erroneity cell voltage lower than the second threshold value lower than the first threshold value, .

Description

TECHNICAL FIELD [0001] The present invention relates to a battery monitoring device, a disconnection detecting program, and a disconnection detecting method for a power storage module,

TECHNICAL FIELD [0001] The present invention relates to a technique for detecting disconnection of an electric wire connecting between a plurality of unit cells and a cell monitor.

For example, a battery module (battery module device) includes a battery module in which a plurality of unit cells are connected in series, and a voltage measuring circuit connected to each unit cell through electric wires, so that each unit cell can be monitored (Patent Document 1). Further, since the unit cell can not be normally monitored if the electric wire is broken, there is a battery unit having a function of detecting the disconnection of electric wire (Patent Document 2). In this assembled battery device, a plurality of capacitors connected in parallel to each unit cell and having different capacities are provided, and a change in voltage behavior occurs at a normal time and at an abnormal time when a disconnection occurs, and by detecting this, it is possible to detect disconnection .

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-56350

Patent Document 2: Japanese Patent Application Laid-Open No. 2002-204537

However, in the above battery unit, it is necessary to provide a plurality of capacitors having different capacitances for the disconnection detecting function. Therefore, there is a problem such as a restriction in construction, and it is required to detect disconnection by other means.

In this specification, a technique for detecting a disconnection of a wire connecting between each of a plurality of unit cells (such as a unit cell) and a cell monitoring device (such as a voltage measuring circuit) is disclosed.

The cell monitoring device of the power storage module of the power storage module disclosed in this specification is characterized in that the cell monitoring device of the power storage module in which a plurality of cells are connected in series is a cell monitoring device of a power storage module in which a plurality of cells are connected in series, A switch control process for switching all or a part of the plurality of switches from off to on in a predetermined order and turning off the switches in a predetermined order; A voltage between a pair of the electric wires connected to each cell is set so that a voltage is applied to each cell after the switch connected in parallel to the cell is turned off again and the above- A cell voltage measuring process of measuring a cell voltage corresponding to a cell voltage measured by the cell voltage measuring process; And determining whether there is at least one of a low-voltage cell voltage that is lower than a first threshold value and a low-voltage cell voltage that is lower than a first threshold value; and determining whether at least one of the high- And when it is determined that there is an electric wire, the disconnection detecting process for detecting that the electric wire is disconnected is executed.

In the cell monitoring device of the power storage module, when it is determined that both of the high-error cell voltage and the low-error cell voltage are present in the abnormality determination process, the control unit causes the cell corresponding to the high- It may be detected that the electric wire between the cell corresponding to the abnormal cell voltage is disconnected.

In the cell monitoring device of the power storage module, in the switch control process, all or a part of the switches of the plurality of switches are switched from off to on in the switch order from the one end cell to the other end cell of the power storage module In the cell voltage measurement process, the voltage between a pair of the electric wires connected to the respective cells is set to be equal to or larger than a predetermined value after the switch connected in parallel to the cell is turned off again, The cell voltage corresponding to each cell may be measured after the next switch is turned on.

In the above-described cell monitoring device for power storage module, the abnormality determination process determines whether or not the cell voltage is the low-anomaly cell voltage in the cell order opposite to the switch order from the cell voltage corresponding to the cell on the other end side And a low-anomaly detection circuit for detecting a low-anomaly cell voltage and a low-anomaly cell voltage in a case where it is determined that the low- And when it is determined in the high error detection process that the cell voltage is the high cell voltage, the cell voltage at the next highest cell voltage is set as the head, Voltage abnormality detecting means for detecting a voltage abnormality in the abnormality detection cell, And a specified cell, or may be detected that a wire between the cell and which corresponds to the cell voltage and it is determined that the last cell voltage or more is cut off corresponding to the cell voltage.

In the cell monitoring device of the power storage module, in the abnormality determination process, the control unit determines whether or not the cell voltage corresponding to the cell at the one end side is in the same cell order as the switch order, A cell voltage of the cell voltage higher than the high cell voltage is set as a leading cell and the cell voltage in the high cell voltage is determined as the low cell voltage in the cell order And when it is determined that the cell voltage is the low-error cell voltage in the low-error cell search process, the cell voltage of the low- Voltage error detection circuit for detecting whether or not the voltage of the high voltage cell is equal to or higher than a predetermined voltage, The is also good to detect that the electric wire is broken between the cells corresponding to the cell and the last cell and the low voltage over it is determined that the cell voltage corresponding to the cell voltage.

In the cell monitoring apparatus of the power storage module, the control unit may include a module voltage measuring process of measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage, The threshold value changing unit may further be configured to execute a threshold value changing process of changing the threshold value to a smaller value as the module voltage becomes smaller.

In the cell monitoring device of the power storage module, the controller may be configured such that a plurality of cell voltages corresponding to a cell group that is continuous at the head of the shortest cell or the shortest cell among the plurality of cell voltages is equal to or less than a third threshold Side-end cell voltage is determined to be the one-side-abnormality cell voltage; and, if it is determined in the one-side determination process that the voltage is the short-side-abnormality cell voltage, Side disconnection detecting process for detecting that the shortest-side wire is disconnected.

In the cell monitoring device of the power storage module, when it is determined in the one-side determination process that the plurality of cell voltages are the one-side cell voltage, the control section determines, in the abnormal determination process, The cell voltage other than the innermost cell may be set as the object to be processed.

In the cell monitoring device of the power storage module, the control unit may include: a module voltage measuring process of measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage; And a number of cells corresponding to the cell voltage determined as the short-side-abnormality cell voltage in the above-described one-side determination process, and outputs the first threshold value and the second threshold value as the estimated value It is also possible to further configure the threshold value changing process to change the value to a smaller value.

The cell monitoring device of the power storage module further includes a plurality of constant voltage elements connected in parallel to each of the plurality of cells, wherein an upper limit value of a range of change of the first threshold in the threshold value changing process is a reaction voltage value Or the maximum value of the measurable range in the cell voltage measurement process.

The invention disclosed in this specification can be realized in various forms such as a cell monitoring unit, a disconnection detecting method, a computer program for realizing the functions of these methods or apparatus, and a recording medium storing the computer program.

According to the invention disclosed in this specification, it is possible to detect disconnection of electric wires connecting between each of a plurality of unit cells and a cell monitoring apparatus by means other than the conventional method.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an electrical configuration diagram of a battery pack according to a first embodiment. FIG.
Fig. 2 is a first part of the flow chart showing control processing.
3 is a second part of the flow chart showing control processing.
4 is a circuit diagram showing the disconnection pattern 1. Fig.
5 is a circuit diagram showing the disconnection pattern 2. Fig.
6 is a circuit diagram showing the disconnection pattern 3. Fig.
Fig. 7 is a circuit diagram showing the disconnection pattern 4. Fig.
8 is a flowchart showing the intermediate processing in the second embodiment.
9 is a flowchart showing the intermediate processing in the third embodiment.

According to the cell monitoring apparatus of the embodiment, all or a part of the plurality of switches are turned off in a predetermined order and then turned off again. Then, the voltage between a pair of wires connected to each cell corresponds to each cell after the time when the switch connected in parallel to the cell is turned off again, The cell voltage is measured. Here, at the time when the electric wire is disconnected, at least one of the measured plural cell voltages is higher than the unstable normal cell voltage and less than the normal cell voltage.

Thus, in the present cell monitoring apparatus, the presence or absence of at least one of the measured cell voltages, the high-erroneous cell voltage being equal to or higher than the first threshold value and the low-erroneating cell voltage being equal to or lower than the second threshold value (the first threshold value) is determined. If it is determined that there is at least one of the high cell voltage and the low cell voltage, it is detected that at least one of the wires is disconnected.

Further, when it is judged that both the high-erroneous cell voltage and the low-erroneous cell voltage are both found in the cell monitoring apparatus, the electric wire between the cell corresponding to the high-erroneous cell voltage and the cell corresponding to the low- May be detected. Thus, it is possible to roughly specify not only the presence or absence of disconnection, but also the range within which the disconnection wire is within the range.

All or a part of the switches of the plurality of switches are turned on and off again in the switch order from the one end side cell to the other end side cell of the power storage module. Then, when the voltage between a pair of wires connected to each cell is equal to or greater than a voltage corresponding to a cell corresponding to each cell after the time when the switch connected in parallel to the cell is turned off again, And is measured as a voltage. This makes it possible to determine whether or not the electric wires connected to all or a part of the switches of the plurality of switches are disconnected without omission.

When the cell monitoring device determines that there is a low-over-high cell voltage and a high-over-high cell voltage in the cell order opposite to the switch order, It is determined whether or not there is an abnormal cell voltage. Thus, it may be detected that the cell corresponding to the cell voltage determined to be the low-erroneous cell voltage is disconnected from the cell corresponding to the cell voltage determined to be the high-erroneous cell voltage last. This makes it possible to detect not only a disconnection between a cell corresponding to a lower-limit cell voltage and a cell corresponding to a higher-abnormality cell voltage but also a disconnection between a plurality of cells corresponding to a neighboring higher-erase cell voltage.

The cell monitoring apparatus is characterized in that when it is judged that there is a low-error cell voltage and a high-error cell voltage in the same cell order as the switch order, the next cell voltage of the high- It is determined whether there is no cell voltage. Thus, it may be detected that the wire between the cell corresponding to the cell voltage determined to be the high-erroneous cell voltage and the cell corresponding to the cell voltage determined to be the low-erroneous cell voltage last is disconnected. This makes it possible to detect a disconnection between a cell corresponding to a high-error cell voltage and a cell corresponding to a low-overcell voltage, as well as a disconnection between a plurality of cells corresponding to a mutually adjacent low-overcell voltage.

In the cell monitoring apparatus, a voltage between the shortest wires connected to both ends of a plurality of cells is measured as a module voltage, and the first threshold value and the second threshold value may be changed to smaller values as the module voltage becomes smaller. Thus, it is possible to change the first threshold value and the second threshold value to an appropriate value in response to a change in the charged amount of the power storage module.

In the cell monitoring apparatus, it is determined whether or not one or a plurality of cell voltages corresponding to the shortest cell or a cell group continuing at the shortest cell at the head is a short-side abnormal cell voltage lower than a third threshold value. Thus, when it is judged that the cell voltage is more than one side, it may be detected that the shortest one of the two electric wires connected to both ends of the cell corresponding to the cell having the more than one side is disconnected. Thus, it is possible to detect that the single-side wire is disconnected.

In the cell monitoring apparatus, when it is determined that a plurality of cell voltages are the above-mentioned one-side cell voltage, in the abnormal determination process, a cell voltage other than the innermost cell that is farthest from the shortest cell among the plurality of cell voltages is processed It may be outside the target. This makes it possible to reduce the processing burden as compared with a configuration in which all the cell voltages are subjected to the abnormality determination processing regardless of the determination result of the single side determination processing.

In the cell monitoring apparatus, a voltage between the shortest wires connected to both ends of a plurality of cells is measured as a module voltage, and the module voltage is measured as the total number of cells and the cell voltage An estimated value which is a value obtained by dividing by the difference in the number of cells corresponding to the cell voltage is calculated. Thus, the first threshold value and the second threshold value may be changed to smaller values as the guess value is smaller. As a result, it is possible to change the first threshold value and the second threshold value to appropriate values in accordance with the variation of the charged amount of the power storage module and the disconnection of the electric wire on the short side.

In the cell monitoring apparatus, the upper limit value of the change range of the first threshold value may be the maximum of the reaction voltage value of the constant voltage device or the measurable range in the cell voltage measurement process. This makes it possible to suppress the range in which the cell voltage can be measured and the erroneous detection of disconnection due to the clamp of the constant-voltage element. In addition, the reaction voltage of the constant-voltage element may fluctuate due to a change in temperature or the like. The maximum value of the measurable range may deviate by a predetermined amount from the value of the specification due to the influence of noise or the like. Therefore, the upper limit value is not only the predetermined value but also the upper limit value is within the variation range of the reaction voltage that is assumed in advance. The upper limit value is the maximum value of the measurable range, which includes not only the predetermined upper limit value but also a predetermined range including the specification value.

≪ Embodiment 1 >

Embodiment 1 will be described with reference to Figs. 1 to 7. Fig. The battery pack 80 of the present embodiment is an example of a power storage pack and includes a battery module 81 and a cell monitor 71. [ The battery pack 80 is mounted on, for example, an electric car or a hybrid vehicle, and supplies electric power to various devices in the car.

(Electrical Configuration of Battery Pack)

As shown in FIG. 1, the battery module 81 is an example of a power storage module, and is a battery module in which four first cells (1) to fourth cells (4) are connected in series. Further, the battery module 810 may be configured such that two, three, or five or more cells are connected in series. Each of the cells 1 to 4 is a secondary battery such as a lithium ion battery. However, the cells 1 to 4 are not limited to single cells but may be capacitors or capacitors. In the following description, it is assumed that the cell voltages of the cells 1 to 4 are about 2.5 to 4.2 V at the normal time when abnormalities such as disconnection, overdischarge, overcharge, and the like are not generated.

Each of the cells 1 to 4 is connected to the cell monitoring unit 70 of the cell monitoring device 71 via five voltage measuring lines 60 to 64. [ The five voltage measurement lines 60 to 64 are examples of electric lines. Hereinafter, the voltage measurement line with the lowest electric potential is referred to as a ground line 60, and the remaining four voltage measurement lines correspond to the respective cells 1 to 4 The first measurement line 61, the second measurement line 62, the third measurement line 63 and the fourth measurement line 64 may be referred to as a first measurement line 61, a second measurement line 62, a third measurement line 63,

The cell monitoring device 71 has zener diodes 11 to 14, equalizing circuits 91 to 94, RC filters 101 to 104, a cell monitoring part 70 and a module measuring circuit 72. The zener diodes 11 to 14 are connected in parallel to the respective cells 1 to 4 so that a voltage exceeding the zener voltage, for example, when the cells 1 to 4 are overcharged or a surge occurs Is input to the cell monitoring unit 70 is suppressed. It is also assumed that the zener voltage of each of the zener diodes 11 to 14 is 6.5V and the forward voltage drop is 0.7V. The zener diodes 11 to 14 are examples of the constant voltage device and are not limited to zener diodes and may be any device that holds the voltage of the device at the reaction voltage when the applied voltage is higher than the reactive voltage.

The equalizing circuits 91 to 94 are connected in parallel to the respective cells 1 to 4. The equalizing circuits 91 to 94 are connected in series to the switches 21 to 24 and the discharge resistors 31 to 34, (Also referred to as a discharge circuit). Each of the switches 21 to 24 is on-off controlled by the cell monitoring unit 70. The switches 21 to 24 may be switch means for controlling current in the IC as well as semiconductor switch elements and contactors (electromagnetic contactors) such as FETs. Hereinafter, the switches 21 to 24 are also referred to as a first switch 21, a second switch 22, a third switch 23 and a fourth switch 24 in correspondence with the cells 1 to 4, respectively. The cell monitoring unit 70 discharges the cells 1 to 4 and the capacitors 51 to 54 to be described later by turning the switches 21 to 24 from off (opened) to on (closed). This makes it possible to make the cell voltages of the cells 1 to 4 uniform or to match the voltages across the capacitors 51 to 54 with the cell voltages of the corresponding cells.

The RC filters 101 to 104 are connected in parallel to the cells 1 to 4, respectively. Each of the RC filters 101 to 104 is a low pass filter having resistors 41 to 44 and capacitors 51 to 54 for the filter and suppresses the input of the high frequency signal into the cell monitoring unit 70. Also, the capacitances of the capacitors 51 to 54 become uniform.

The cell monitoring unit 70 has a central processing unit (hereinafter referred to as a CPU) 70A, a memory 70B, and a voltage measuring circuit 70C. The memory 70B stores various programs (including a disconnection detecting program) for controlling the operation of the cell monitoring unit 70. The CPU 70A controls the cell monitoring unit 70B in accordance with the program read from the memory 70B. (70). The memory 70B has a RAM or a ROM. The medium in which the various programs are stored may be a nonvolatile memory such as a CD-ROM, a hard disk device, or a flash memory in addition to a RAM.

The cell voltage measuring circuit 70C is connected to each of the cells 1 to 4 via each of the voltage measuring lines 60 to 64 and supplies a voltage between each of the voltage measuring lines 60 to 64 to each cell 1, 4), and transfers the measurement results to the CPU 70A. The cell voltages measured by the cell voltage measuring circuit 70C are hereinafter referred to as measured cell voltages E1 to E4 and are distinguished from the actual cell voltages of the cells 1 to 4. The measurable range of the cell voltage of the cell voltage measuring circuit 70C is 0 to 5V.

The module measurement circuit 72 measures the voltage between the ground line 60 and the fourth measurement line 64 as the module voltage of the battery module 81 and outputs the measurement result to the CPU 70A . Hereinafter, the module voltage measured by the module measuring circuit 72 is referred to as a measuring module voltage Em to distinguish it from the actual module voltage of the battery module 81. The cell monitoring unit 70 and the module measuring circuit 72 are examples of the control unit.

(Control of cell monitoring device)

For example, when the power source of the cell monitoring unit 70 is turned on, the CPU 70A turns off the program from the memory 70B and executes the control processing relating to disconnection detection shown in Figs. By this control processing, it is possible to detect not only the presence of disconnection of the voltage measurement lines 60 to 64 but also which of the voltage measurement lines 60 to 64 is disconnection.

The CPU 70A executes the switch control process, the cell voltage measurement process, and the module voltage measurement process (described as "process 1" in FIG. 2). The CPU 70A first initializes the number of intermediate cells ('Count' in FIG. 2) and the ground rank ('GND LINE' in FIG. 2) to zero (S1). The ground rank is the rank of the voltage measurement line corresponding to the non-broken ground line, and the non-star line ground line is the voltage measurement line of the lowest potential that is not disconnected among the voltage measurement lines 60 to 64. For example, if the ground rank is 0, the non-line line ground line is the ground line 60, and if the ground rank is 1, the non-line line ground line is the first measurement line 61.

 (1-1) Switch control processing

Next, the CPU 70A executes switch control processing. In the switch control process, all the switches 21 to 24 are initially turned off, and the switches 21 to 24 are switched from the fourth cell 4 having the highest potential to the first cell 1 having the lowest potential (In descending order), and discharging operations are performed in which the discharging operation is turned on for a predetermined discharging time from off and then turned off again. Specifically, the CPU 70A turns the fourth switch 24 on and then turns off again (S2), turns the switch 23 on and off again (S3), and turns on the second switch 22 are turned on and then turned off again (S4). Finally, the first switch 21 is turned on and then turned off again (S5).

(1-2) Specific Example

By performing this switch control process, the measured cell voltages E1 to E4 of each of the cells 1 to 4 measured by the cell monitoring unit 70 are compared with the measured cell voltages E1 to E4 corresponding to the disconnection patterns 1 to 4 shown in Figs. Lt; / RTI > In the drawings, the configuration and reference numerals of the cell monitoring device 71 are partially omitted. In the drawings, the voltage values written on the sides of the capacitors 51 to 54 are the voltages across the capacitors 51 to 54 after the switch control processing is performed. The actual cell voltage of each cell (1 to 4) is 4.2V.

In the disconnection pattern 1 of Fig. 4, only the ground line 60 is disconnected. In this case, since none of the voltage measuring lines connected to both the positive terminal and the negative terminal is disconnected from the cells 2 to 4, the measured cell voltages E2 to E4 are the actual cell voltages of the cells 2 to 4 (4.2 V). However, in the first cell 1, since the ground line 60 connected to the negative terminal is disconnected, a current ("current flow: solid line arrow" in FIG. 4) flows in the zener diode 11 in the forward direction. As a result, the measurement cell voltage E1 becomes equal to a negative voltage (approximately -0.7 V) corresponding to the forward voltage drop of the zener diode 11. Thus, when the voltage measuring line of the lowest potential is disconnected, the measured cell voltage of the cell connected to the voltage measuring line becomes a value smaller than the minimum value (2.5 V) at the normal time.

4) is applied to the Zener diodes 11 and 12 when the first measuring line 61 is further disconnected (indicated by 'X' in FIG. 4) in the disconnection pattern 1, Dotted arrow ') flows. As a result, the measured cell voltages E1 and E2 become equal to the negative voltages corresponding to the forward voltage drop of each of the zener diodes 11 and 12. In this way, when a plurality of voltage measurement lines continuing from the voltage measurement line of the lowest potential of the battery module 81 are disconnected, the measurement cell voltages of the cells respectively connected to the plurality of voltage measurement lines are Is smaller than the minimum value.

In the disconnection pattern 2 of Fig. 5, only the fourth measuring line 64 is disconnected. In this case, since none of the voltage measuring lines connected to both the positive electrode terminal and the negative electrode terminal is disconnected from the cells 1 to 3, the measured cell voltages E1 to E3 are approximately equal to the actual cell voltages of the cells 1 to 3 Match. However, since the fourth measuring line 64 connected to the positive terminal of the fourth cell 4 is disconnected, a current ('current flow: solid line arrow' in FIG. 5) flows in the forward direction to the Zener diode 14 . As a result, the measurement cell voltage E4 becomes equal to the negative voltage corresponding to the forward voltage drop of the Zener diode 14. [ In this way, when the voltage measurement line of the highest potential of the assembled battery module 81 is disconnected, the measured cell voltage of the cell connected to the voltage measurement line becomes a value smaller than the minimum value at the normal time.

5) in the disconnection pattern 2 and further in the case where the third measuring line 63 is also disconnected (indicated by "X" in FIG. 5) Current direction: dotted arrow ') flows. As a result, the measured cell voltages E3 and E4 are equal to the negative voltages corresponding to the forward voltage drop of each of the Zener diodes 13 and 14. In this way, when a plurality of voltage measuring lines continuing at the top of the voltage measuring line of the highest potential of the battery module 81 are disconnected, the measured cell voltages of the cells connected to the plurality of voltage measuring lines are, Is smaller than the minimum value.

In the disconnection pattern 3 of Fig. 6, only the second measuring line 62 is disconnected. In this case, since none of the voltage measuring lines connected to both the positive electrode terminal and the negative electrode terminal is disconnected in the first cell (1) and the fourth cell (4), the measured cell voltages (E1, E4) And substantially coincides with the actual cell voltage of each fourth cell (4). However, the second measuring line 62 connected between the second cell 2 and the third cell 3 is disconnected. Therefore, when the third switch 23 is turned on by the switch control process, the voltage of the zener diode 12 (12.4 V = 4.2 V x 2) of the sum of the cell voltages of the second cell 2 and the third cell Is applied to the capacitor 52 and the remaining voltage (1.9 V = 8.4 V-6.5 V) is applied to the capacitor 53.

Next, when the third switch 23 is turned off and the second switch 22 is turned on, the Zener voltage (6.5 V) of the Zener diode 13 is applied to the capacitor 53, and the remaining voltage (1.9 V is applied to the capacitor 52. [ As a result, the measurement cell voltage E2 becomes 1.9 V and the measurement cell voltage E3 becomes the maximum value (5 V) of the measurable range. The disconnection pattern 3 is an example of a case in which switch control processing is executed in the order of one disconnected voltage measurement line and in a direction from the high voltage side to the low voltage side between two unmetered voltage measurement lines. In such a case, of the two cells connected between the two unconnected voltage measuring lines, the measured cell voltage of the cell on the low potential side becomes a value smaller than the lowest value in the normal state. And the measured cell voltage of the cell at the higher potential side becomes a value larger than the highest value at the normal time.

7, the first measurement line 61 and the second measurement line 62 are disconnected. In this case, since none of the voltage measuring lines connected to both the positive terminal and the negative terminal of the fourth cell 4 is disconnected, the measured cell voltage E4 is approximately equal to the actual cell voltage of the fourth cell 4 Match. However, the first measurement line 61 and the second measurement line 62 connected between the first to third cells 1 to 3 are disconnected. Therefore, when the switches 22 and 23 are turned off and the first switch 21 is turned on by the switch control processing, a voltage of about 0 V is applied to the capacitor 51, The total cell voltage (12.6 V = 4.2 V x 3) of the three cells (1 to 3) is divided by the capacitors 52 and 53. As a result, the measurement cell voltage E1 is approximately 0 V, and the measurement cell voltages E2 and E3 are all 5 V.

Also, the measurement cell voltage E3 may be clamped to the Zener voltage (6.5V) and the measurement cell voltage E2 may be 6.1V (= 12.6V-6.5V). In this case, when the module voltage is small, the measured cell voltage E2 may be a cell voltage at the normal time or a value smaller than the normal cell voltage. The disconnection pattern (4) is an example of a case where a plurality of voltage measuring lines are disconnected between two unmetered voltage measuring lines, and switch control processing is executed in order from a higher voltage to a lower voltage. In such a case, the measured cell voltage of the cell having the lowest potential among the plurality of cells connected between the two unconnected voltage measuring lines becomes a value smaller than the lowest value at the normal time. The measurement cell voltage corresponding to the cell having the highest potential is a value larger than the maximum value at the normal time. The measured cell voltages of the cells other than the highest potential and the lowest potential are either a value smaller than the minimum value at normal time, a value at normal time, or a value greater than the maximum value at normal time depending on the situation.

(2) Cell voltage measurement processing, module voltage measurement processing

Next, the CPU 70A executes the cell voltage measurement process and the module voltage measurement process (S6). Specifically, the CPU 70A acquires measurement results from the cell voltage measuring circuit 70C and stores the measured cell voltages E1 to E4 in the memory 70B in association with the cells 1 to 4, respectively. The CPU 70A also obtains the measurement result from the module measurement circuit 72 and stores the measurement module voltage Em in the memory 70B.

(3-1) Low potential side treatment

Next, the CPU 70A executes a low potential side process (described as "process 2" in FIG. 2). In this low potential side processing, the CPU 70A determines the ground rank by detecting a voltage line which is continuously disconnected from the ground line 60 having the lowest potential. The low-potential side process is an example of the abnormality determination process.

Specifically, the CPU 70A first sets the rank M to 1 (S11). The rank M indicates that the first cell 1 is the first cell 1 and the second cell 2 is the second cell. When the cell M is 3, the cell 3 is the third cell 3 and the fourth cell 4 is the fourth cell. Next, the CPU 70A executes the end side determination processing. In the one-side determination process, the CPU 70A determines whether the first cell 1 having the lowest potential among the measured cell voltages E1 through E4, or one or more measurement cells corresponding to the cell group continuing at the head of the first cell 1 It is determined whether or not the voltage is a cell voltage on one side or more (end side abnormal). The threshold value for single-sided disconnection is an example of the third threshold value, and it is preferable that the threshold value is less than or equal to the low-threshold threshold value described later. Further, a value smaller than the low-threshold threshold value is more preferable. In addition, the threshold value for single-sided breakage is determined by considering the influence of noise and the like

(For example, 0V to 0.1V). Hereinafter, the threshold for single-sided disconnection is set to 0V.

Specifically, the CPU 70A determines whether the measured cell voltage E1 of the first cell 1 is equal to or less than the threshold for the single-side disconnection (S12) and determines that the measured cell voltage W1 is larger than the single- (S12: NO), it is determined that there is no more than one-sided cell voltage on the lowest potential side, and the process shifts to high potential side processing. At this time, the ground rank is fixed to 0, and the non-linear line becomes the ground line 60.

On the other hand, when it is determined that the measured cell voltage E1 is equal to or lower than the threshold value for short-side disconnection (S12: YES), the CPU 70A assumes that the measured cell voltage E1 is the one-side abnormal cell voltage. The CPU 70A detects that the ground line 60 connected to the negative terminal of the first cell 1 is disconnected (S14), because the rank M is 1 (S13: Yes) 1 is added to the ranking (S15). Namely, the candidate of the non-linear line is changed from the ground line 60 to the first measurement line 61. Next, the CPU 70A increments the rank M by 1 (S16). If it is determined that the rank M does not reach the cell total number 4 (S17: NO), the CPU 70A returns to S12.

Next, when it is determined that the measured cell voltage of the rank M (> 1) is equal to or less than the threshold value for the single-sided disconnection (S12: YES), the CPU 70A determines that the rank M is not 1 (S13: ), It is detected that the voltage measuring line of M-1 following the negative terminal of the cell of the rank M is disconnected (S18), and the process proceeds to S15. S14 and S18 are examples of the single-side disconnection detecting process. If it is determined in step S17 that the rank M has reached 4 (YES in step S17), the rank M at that point is determined as the rank of the ground, and the voltage measurement line of the rank M is determined as the non-linear line.

(3-2) Specific example

4, the measured cell voltage E1 is equal to or less than the threshold value for short-side disconnection (S12: YES), it is detected that the ground line 60 is disconnected (S14). Next, the measurement cell voltage E2 is determined to be 1 (S12: NO), and the first measurement line 61 is determined as the non-linear line.

If the first measurement line 61 is also detected in the disconnection pattern 1, the measurement cell voltage E2 is also equal to or less than the threshold value for short-side disconnection (S12: YES), so that the first measurement line 61 is also disconnected Is detected (S18). Next, since the measurement cell voltage E3 is larger than the threshold value for short-side disconnection (S12: NO), the ground rank is determined as 2 and the second measurement line 62 is determined as the non-end line ground line. This makes it possible to detect not only the ground line 60 but also a plurality of voltage measuring lines continuing from the ground line 60 at the beginning. In the disconnection patterns 2 to 4, since the measurement cell voltage E1 is larger than the threshold value for short-side disconnection (S12: NO), the disconnection of the voltage measuring line on the low potential side is not detected and the low potential side process is terminated .

(4-1) High-potential side processing

After executing the low potential side processing, the CPU 70A executes the high potential side processing (described as "process 3" in FIG. 3). In this high potential side processing, the CPU 70A determines a high potential order by detecting a voltage measurement line which is continuously disconnected from the first measurement line 64 having the highest potential. The high potential order is the rank of the voltage measurement line corresponding to the nonlinear topmost line, and the nonlinear top line is the voltage measurement line of the highest potential not disconnected among the voltage measurement lines 60 to 64. The high-potential side processing is an example of the abnormality determination processing.

Specifically, the CPU 70A first sets the rank N to 4 (S21). A rank N indicates a fourth cell, 3 indicates a third cell, 2 indicates a second cell, and 1 indicates a first cell. The rank N at the end of the high-potential side processing becomes the high-potential rank. Next, the CPU 70A executes the one-side determination processing. In this single-sided determining process, the CPU 70A determines whether or not the fourth cell 4 having the highest potential among the measured cell voltages E1 to E4 or one or a plurality of measurements corresponding to the cell group continuous at the head of the fourth cell 4 It is determined whether or not the cell voltage is the one or more side cell voltage.

Specifically, the CPU 70A determines whether the measured cell voltage E4 of the fourth cell 4 is equal to or less than the threshold for the single-side disconnection (S22). If it is determined that the measured cell voltage E4 is greater than the threshold for the single- S22: No), it is determined that there is no more than one-side cell voltage on the highest potential side, and transition is made to the threshold value changing process. At this time, the high potential order is determined to be 4, and the non-line hypothermic line becomes the fourth measurement line 64.

On the other hand, when it is determined that the measured cell voltage E4 is equal to or less than the threshold value for single-side disconnection (S22: YES), the CPU 70A determines that the measured cell voltage E4 is the one- The CPU 70A detects that the fourth measuring line 64 connected to the positive terminal of the fourth cell 4 is disconnected (S23), subtracts 1 from the rank N (S24) When the rank N reaches 1 (S25: YES), it is determined that all of the voltage measurement lines 61 to 64 are disconnected, and the control process ends. It is preferable that the CPU 70A informs the external device such as the control part of the electric vehicle, for example, at the time of detecting the disconnection or at the end of the control processing.

On the other hand, if the rank N after the subtraction does not reach 1 (S25: NO), the CPU 70A returns to S22, and if it is determined that the measured cell voltage in the next rank N (<4) (S22: Yes), the processes of S23 to S25 are repeated. On the other hand, when it is determined that the measured cell voltage of rank N (<4) is larger than the threshold for single-sided disconnection (S22: NO), CPU 70A determines rank N at this time as high-potential rank. Then, the CPU 70A sets the value obtained by subtracting the ground rank from the rank N as the intermediate cell number (S26), and shifts to the next threshold value changing process. The number of intermediate cells is the total number of cells (hereinafter referred to as 'intermediate cells') connected between the nonlinear maximum line and the nonlinear line.

(4-2) Specific example

5, the measurement cell voltage E4 is equal to or less than the threshold value for short-side disconnection (S22: YES), it is detected that the fourth measurement line 64 is disconnected (S23). Next, since the measurement cell voltage E3 is larger than the threshold value for short-side disconnection (S12: NO), the high-potential order is determined as 3, and the ground rank is zero.

When the third measurement line 63 is also disconnected in the disconnection pattern 2, the measurement cell voltage E3 is also equal to or less than the threshold for the single-sided disconnection (S22: YES), and the third measurement line 63 is also disconnected Is detected (S23). Next, since the measurement cell voltage E2 is larger than the threshold value for short-side disconnection (S22: NO), the high-potential order is determined as 2, and the ground rank is zero. This makes it possible to detect that a plurality of voltage measuring lines continuing at the head of the fourth measuring line 64 as well as the fourth measuring line 64 are disconnected. Further, in the disconnection patterns 1, 3, and 4, the measurement cell voltage E4 is larger than the threshold value for short-side disconnection (S12: NO), so that the disconnection of the voltage measurement line at the high potential side is not detected and the high potential side process ends.

(5) Threshold value change processing

After executing the high-potential side process, the CPU 70A executes a threshold value change process (described as "process 4" in FIG. 3). In the threshold value changing process, the CPU 70A changes the high and low abnormal thresholds and the low (abnormal) threshold values described later according to the increase or decrease in the measurement module voltage Em. Specifically, the CPU 70A calculates a value obtained by dividing the measurement module voltage Em measured at S6 by the intermediate cell number as an estimated value of the average value of the cell voltage (S31). Here, as will be described later, since the high-error threshold value and the low-error threshold value are obtained by multiplying the estimated value by a predetermined coefficient, they are changed in accordance with the increase or decrease in the estimated value. Thus, it is possible to change the high-error threshold value and the low-threshold value to an appropriate value according to the change in the charged amount of the battery module 81 and the disconnection of the voltage measuring line on the short side.

(6-1) Intermediate side processing

After executing the threshold value changing process, the CPU 70A executes the intermediate side process (step 6 in FIG. 3). In this intermediate processing, the CPU 70A determines the presence or absence of the high-erroneous cell voltage and the low-erroneous cell voltage with respect to the measured cell voltage corresponding to the intermediate cell, (Hereinafter referred to as &quot; intermediate measurement line &quot;).

Specifically, the CPU 70A first sets the value obtained by adding 1 to the ground rank (step S41), and the measured cell voltage of the cell of rank A becomes the first candidate to perform the following process. Next, when the CPU 70A determines that the high potential order is lower than the rank A (S42: NO), the CPU 70A determines that there is no intermediate measurement line and ends the control process.

On the other hand, when it is determined that the high potential order is larger than the rank A (S42: YES), the CPU 70A determines that there is at least one intermediate measurement line, and then starts the low error search process. In this low-error searching process, the CPU 70A judges whether or not the measured cell voltage of each intermediate cell is a low-abnormal cell voltage in the cell order (ascending order) from the intermediate cell with the lowest potential to the intermediate cell with the highest rank I'll go. The cell order here is opposite to the switch order of the switch control process.

Specifically, the CPU 70A first determines whether the measurement cell voltage of the rank A is a low-surplus cell voltage (S43). The low-over-cell voltage refers to the measured cell voltage below the low-to-high threshold. The low threshold value is an example of the second threshold value and is determined in consideration of the unevenness of the cell voltages of the cells 1 to 4 and the allowable range of the measurement accuracy of the cell voltage measuring circuit 70C, It is preferable that the value is less than the over-discharge judgment threshold value for judging whether or not the state is the state. In the present embodiment, the low-error threshold value is obtained by multiplying the estimated value calculated in S31 by the coefficient, and is changed in accordance with the increase or decrease in the guess value. This coefficient is preferably determined by experiment or the like in consideration of non-uniformity and error of the actual cell voltage or forward voltage drop of each of the Zener diodes 11 to 14. In the following, the coefficient is set to 0.5.

However, the lower limit value is fixed in the change range of the lower threshold value. This is for the purpose of avoiding that the disconnection of the intermediate measurement line can not be detected when the measurement module voltage Em is relatively small. For example, in the disconnection pattern 4 shown in Fig. 7, it is assumed that the measured cell voltage E1 is substantially 0, as described above. However, in practice, the measurement cell voltage E1 may be on the order of hundreds of mV due to the influence of the on-resistance of the switch 21 and the like.

Here, it is assumed that the measured cell voltage E1 is 0.8V. On the other hand, when the measurement module voltage Em is smaller than the normal time due to, for example, a discharge abnormality, and the estimated value is 1.5 V, the low abnormal threshold value is 0.75 V (= 1.5 V x 0.5). If so, the measurement cell voltage E1 is larger than the low-anomaly threshold value, so that the disconnection of the first measurement line 61 can not be detected. Therefore, the lower limit value is set in the change range of the low-error threshold value. The lower limit value can be obtained by an experiment or the like, and may be set to a predetermined range (for example, 0.8V to 1.2V) in consideration of the influence of noise or the like. In the following, the lower limit is set to 1V.

When the CPU 70A determines that the measured cell voltage of the rank A is larger than the low abnormal threshold (S43: NO), the CPU 70A determines that the measured cell voltage is not the low-over-rated cell voltage, adds 1 to the rank A S44), and returns to S42. If there is no more than the lower cell voltage until the rank A matches the high potential order (S24: NO), it is determined that the intermediate measurement line is not disconnected and the control process is terminated.

When it is determined that the measured cell voltage of the rank A is equal to or lower than the low-abnormal threshold value (S43: YES), the CPU 70A determines that the measured cell voltage is the low- It is detected that the wire is disconnected (S45). Next, the CPU 70A adds 1 to the rank A (S46). If it is determined that the rank A after the addition exceeds the high-potential rank (S47: NO) It is determined that the measurement line is not left, and the control process is terminated.

On the other hand, if the CPU 70A determines that the rank A is lower than the highest potential (S47: Yes), the CPU 70A determines that there is still an intermediate measurement line for which the presence or absence of the disconnection has been determined, . In this high-error search process, the CPU 70A determines whether the measured cell voltage of the intermediate cell is a high-anomalous cell voltage in the cell order.

Specifically, the CPU 70A determines whether the measurement cell voltage of the rank A is the high-anomaly cell voltage (S48). The high-error cell voltage refers to the measured cell voltage that is equal to or higher than the high-error threshold. The high-error threshold is an example of the first threshold, and is determined in consideration of non-uniformity of the cell voltages of the cells 1 to 4 and the allowable range of the measurement accuracy of the cell voltage measuring circuit 70C. For example, Is preferably a value larger than the overcharge determination threshold value for determining the overcharge determination threshold value. In the present embodiment, the high error threshold is obtained by multiplying the speculative value calculated in S31 by the coefficient, and is changed in accordance with the increase or decrease in the speculation value. It is preferable that the coefficient is determined by considering unevenness of an actual cell voltage, an error, or a zener voltage of each control diode 11 to 14, or the like, and the coefficient hereafter is 1.4.

However, the upper limit value is fixed in the change range of the high-error threshold value. This is for the purpose of suppressing erroneous detection of disconnection due to the measurable range of the cell voltage measuring circuit 70C and the zener voltage of the zener diodes 11 to 14. For example, in the disconnection pattern 3 of Fig. 6, the measurement cell voltage E3 is 5V. On the other hand, since the measurement module voltage Em is relatively large, when the estimated value is 4.2 V, the high-error threshold is 5.88 V (= 4.2 V x 1.4). If this is the case, the measurement cell voltage E3 is lower than the high-anomaly threshold value, and therefore, it is determined that the cell voltage is not the high-anomaly cell voltage, and it is impossible to detect the disconnection of the first measurement line 61. Therefore, the upper limit value is set in the range of change of the high-error threshold value.

It is preferable that the upper limit value is a smaller value of the maximum value of the measurable range of the cell voltage and the zener voltage of the zener diodes 11 to 14. [ In addition. (For example, 4.9V to 5.1V) including the maximum value (5V) or a predetermined range (for example, 4.9V to 5.1V) including the upper limit value of the zener voltage (6.5V) in consideration of the influence of noise, 6.4 V to 6.6 V). In the following description, the upper limit value is 5V.

If the CPU 70A determines that the measured cell voltage of the rank A is smaller than the high abnormal threshold (S48: NO), the CPU 70A returns to S45 and determines that the intermediate measurement line connected to the positive terminal of the cell of the rank A is clipped , Adds 1 to the rank A (S46), and proceeds to S47. This makes it possible to detect at least a disconnection between a cell corresponding to a cell voltage lower than the cell voltage and a cell corresponding to a cell voltage higher than the cell voltage. On the other hand, when it is determined that the measured cell voltage of the rank A is equal to or higher than the high abnormal threshold (S48: YES), the CPU 70A adds 1 to the rank A (S49) (S50: NO), it is determined that there is no intermediate measurement line for which the presence or absence of the disconnection detection has not been determined, and the control process ends.

On the other hand, if the CPU 70A determines that the rank A is lower than the highest potential (S50: YES), the CPU 70A determines that there is an intermediate measurement line that does not determine the presence of the disconnection detection, The search process is started. In this remark abnormality search process, the CPU 70A determines whether the measured cell voltage of the intermediate cell remaining in the cell order is not the high-anomaly cell voltage.

Specifically, when the CPU 70A determines that the measured cell voltage of the rank A is smaller than the high-anomaly threshold (S51: NO), the CPU 70A returns to S42. At this time, the intermediate measurement line of the rank A-1 is not disconnected. On the other hand, when it is determined that the measurement cell voltage of the rank A is equal to or higher than the high abnormal threshold value (S51: YES), the CPU 70A detects that the intermediate measurement line of the rank A- I'm going back. This makes it possible to detect disconnection between a plurality of cells adjacent to each other and corresponding to a high-anomaly cell voltage. The processing in S45 and S52 is an example of disconnection detection processing.

(6-2) Specific example

In the disconnection pattern 3 in Fig. 6, it is determined that the measurement cell voltage E2 is the low-anomaly cell voltage (S43: Yes) in the low-anomaly detection process and the measurement cell voltage E3 is the high- (S48: YES). Thereby, it is detected that the second measuring line 62 connected between the second cell 2 and the third cell 3 is disconnected (S45). Since the measurement cell voltage E4 is determined not to be a high-anomaly cell voltage in the abnormality detection process (S51: YES), the third measurement connected to the third cell 3 and the fourth cell 4 The line 63 is not disconnected.

In the disconnection pattern 4 in Fig. 7, the processing result of the low error detection processing and the high error detection processing is the same as the disconnection pattern 3 described above. On the other hand, since the measurement cell voltage E4 is determined to be the high-anomaly cell voltage in the abnormality abnormality detection process (S51: NO), the third measurement line connected between the third cell 3 and the fourth cell 4 63 are also disconnected. In the disconnection patterns 1 and 2, it is determined that there is no lower-than-abnormal cell voltage in the low-error search process (S42: NO), and the intermediate process ends.

(Effect of the present embodiment)

According to the present embodiment, the switches 21 to 24 are turned off in the switch order and turned off again. Then, when the voltage between a pair of voltage measuring lines connected to the cells 1 to 4 is turned on again after the switch connected in parallel to the corresponding cell is turned off, (1 to 4).

Here, when the voltage measurement line is disconnected, at least one of the high-erroneous cell voltage and the low-erroneous cell voltage exists in the measured cell voltages E1 to E4. For example, when only one of the voltage measuring lines on one side of all the voltage measuring lines is disconnected, there is a low-erase cell voltage. In the case where only the intermediate voltage measuring line among all the voltage measuring lines is disconnected, there are a high-erroneous cell voltage and a low-erroneous cell voltage. Thus, in the main cell monitor 80, the presence or absence of the high-erroneous cell voltage and the low-erroneous cell voltage is determined among the measured cell voltages E1 to E4, and it is possible to detect the presence or absence of disconnection of the voltage measurement line based on the determination result.

In the cell monitor 80, when it is determined in the low-potential side process and the high-potential side process that the plurality of measured cell voltages are more than one-side cell voltages, in the intermediate processing, Only the cell voltage of the innermost cell is included in the processing object. This makes it possible to alleviate the processing load on the cell monitoring device 80 as compared with a configuration in which all measurement cell voltages E1 to E4 are subjected to the intermediate processing, irrespective of the determination results of the low potential side processing and the high potential side processing.

&Lt; Embodiment 2 >

Fig. 8 shows a second embodiment. The difference from the first embodiment is in the intermediate processing, and the rest is the same as the first embodiment. In the process shown in FIG. 8, the process in which? Is appended to the end of the step number is different from the intermediate process shown in FIG. 3 in the first embodiment. Therefore, the same reference numerals as in the first embodiment are attached and redundant description will be omitted, and only different parts will be described below.

In the intermediate processing of the second embodiment, the CPU 70A first sets the rank A to the high potential (S41?), And the measured cell voltage of the cell of the rank A becomes the first candidate to perform the following processing. Next, when the CPU 70A determines that the rank A is 0 (S42? No: NO), the CPU 70A ends the control process by judging that there is no intermediate measurement line. When the CPU 70A determines that the rank A is larger than 0 (S42? Yes), the CPU 70A starts the low-error search process (S43). If the CPU 70A determines that the measurement cell voltage of the rank A is larger than the low- S43: No), 1 is subtracted from Rank A (S44?), And the process returns to S42?.

When it is determined that the measured cell voltage of the rank A is equal to or lower than the low-abnormal threshold (s43: Yes), the CPU 70A detects that the intermediate measurement line of the rank A-1 is disconnected (S45?). Next, the CPU 70A subtracts 1 from the rank A (S46?), And if the rank A after the subtraction is judged to be 0 (S47 ?: No), the intermediate measurement line, It is determined that there is no such control process.

On the other hand, when the CPU 70A determines that the rank A is larger than 0 (S47 ?: Yes), the CPU 70A determines that there is an intermediate measurement line that does not determine the presence of dkwlr disconnection detection, ).

When it is determined that the measured cell voltage of the rank A is smaller than the high-anomaly threshold (S48: NO), the CPU 70A returns to S45 alpha. On the other hand, when it is determined that the measured cell voltage of the rank A is equal to or higher than the high abnormal threshold (S48: YES), the CPU 70A subtracts 1 from the rank A (S49?) And determines that the rank A after the subtraction is 0 (S50?: No), it is determined that there is no intermediate measurement line for which it is determined that the disconnection has not been detected, and the control process ends.

On the other hand, when the CPU 70A determines that the rank A is larger than 0 (S50 ?: Yes), the CPU 70A starts the remark abnormality search processing as if there is still an intermediate measurement line that does not determine the presence of the disconnection detection ). When the CPU 70A determines that the measured cell voltage of the rank A is smaller than the high abnormal threshold (S51: NO), the CPU 70A returns to S42. At this time, the intermediate measurement line of the rank A-1 is not disconnected. On the other hand, when it is determined that the measured cell voltage of rank A is equal to or higher than the high abnormal threshold (S51: YES), CPU 70A detects that the intermediate measurement line of rank A + 1 is disconnected (S52?), . As a result, it is possible to detect disconnection between a plurality of cells adjacent to each other and corresponding to a high-error cell voltage. The processing of S45? And S52? Is an example of disconnection detection processing.

&Lt; Embodiment 3 >

Fig. 9 shows a third embodiment. The difference from the first embodiment is in the intermediate processing, and the rest is the same as the first embodiment. 9 is different from the intermediate process shown in Fig. 3 of the first embodiment, and the process in which? Is appended to the end of the step number is shown in Fig. 8 of the second embodiment Which is different from the indicated intermediate processing. Therefore, the same reference numerals as in the first embodiment are attached and redundant description will be omitted, and only different parts will be described below.

The second embodiment is different from the first and second embodiments in that the switch order of the switch control process and the cell order of the intermediate process are the same in the third embodiment. Specifically, the switch order of the third embodiment is the same as that of the first embodiment in the descending order, and is the reverse of the second embodiment. The cell flow of the third embodiment is also the same as that of the second embodiment in the descending order, and is contrary to the third embodiment.

In the first and second embodiments, the CPU 70A has executed the low-error search process (S43), the high-error search process (S48), and the error search process (S51) in this order. On the other hand, in the intermediate processing according to the third embodiment, the high-error search processing (S43?) Is executed instead of the low-malfunction search processing (S43) The process S48? Is executed. In addition, the CPU 70A executes the beep trouble search process (S51?) Instead of the remarks abnormal search process (S51). In the visibility abnormality search process, the CPU 70A determines whether the measured cell voltage of the intermediate cell remaining in the cell order is not a low-over-rated cell voltage.

Specifically, when the CPU 70A determines that the measured cell voltage of the rank A is larger than the low-abnormal threshold (S51?: NO), the CPU 70A proceeds to S42?. On the other hand, when it is determined that the measured cell voltage of the rank A is equal to or less than the low-abnormal threshold (S51?: YES), the CPU 70A detects that the intermediate measurement line of the rank A + 1 is disconnected (S52? I'm going back. As a result, it is possible to detect disconnection between a plurality of cells adjacent to each other and corresponding to a low-over-cell voltage.

<Other Embodiments>

The techniques disclosed in this specification are not limited to the embodiments described by the above description and drawings, but also include the following various forms, for example.

In the above-described embodiment, the cell monitor device 71 has the configuration including the zener diodes 11 to 14. However, the present invention is not limited to this, and the cell monitoring device 71 may have a configuration in which the zener diodes 11 to 14 are not provided or a configuration in which a normal diode is used in place of the zener diodes 11 to 14.

In the above embodiment, the cell monitoring device 71 has the RC filters 101 to 104. However, the present invention is not limited to this, and the cell monitoring device 71 may be configured to have no RC filters 101-104.

In the above embodiment, the capacitances of the capacitors 51 to 54 are uniform, but the capacitors 51 to 54 may be non-uniform. In this case, the ON time of the switches 21 to 24 in the switch control process may be uniformly set to a time period during which the capacitor having the largest capacity can be sufficiently discharged, and the capacitor 51 The time may be individually set in accordance with the capacity of each of the batteries 54 to 54.

In the above embodiment, the cell monitoring unit 70 has a configuration in which control processing is executed by one CPU. However, the cell monitoring unit 70 is not limited to this, and the cell monitoring unit 70 may be configured to execute control processing with a plurality of CPUs or with a hard circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array) Or a configuration in which the control processing is executed by both the hard circuit and the CPU. At least two of the switch control process, the cell voltage measurement process, the low potential side process, the high potential side process, the threshold value change process and the intermediate process may be executed by separate CPUs or hard circuits.

In the above embodiment, the cell monitoring unit 70 has a configuration for detecting which of the voltage measuring lines 60 to 64 is disconnected. However, the present invention is not limited to this, and the cell monitoring unit 70 may be configured to detect only the presence or absence of disconnection by determining the presence or absence of at least one of, for example, a short-side cell voltage, a low- When it is judged that both the low-over-voltage cell voltage and the high-over-voltage cell voltage are present, the cell monitoring unit 70 sets the voltage measurement line between the cell corresponding to the low- May be detected. As a result, it is possible to roughly specify not only the presence or absence of disconnection, but also the range within which the disconnected voltage measurement line is located.

In the above-described embodiment, the switch control process is a process of sequentially executing the discharging operation by time division on the switches 21 to 24. However, the present invention is not limited to this, and the ON period of one switch and the ON period of the next- . The switch control process may be a configuration in which a plurality of switches adjacent to each other are sequentially selected while being shifted one by one in the switch order, and a discharging operation is simultaneously performed on the selected plurality of switches. For example, the discharge operation is performed on the fourth and third switches 24 and 23, the discharge operation is performed on the third and second switches 23 and 22, and the discharge operation is performed on the second and first switches 22 and 21 And finally, the first switch 21 is caused to perform the discharging operation. This configuration makes it possible to shorten the discharge time from the cells 1 to 4 and the capacitors 51 to 54 as compared with the configuration in which the switches are turned on and off one by one, To 4) can be suppressed.

In the above embodiment, the cell monitoring unit 70 collects and measures the cell voltages of the cells 1 to 4 after the discharge operation of all the switches 21 to 24 is completed. However, the present invention is not limited to this, and the cell monitoring unit 70 may perform the cell voltage measurement process in parallel with the switch control process. That is, the cell voltage of each cell may be measured after the switch connected in parallel to the cell is turned off again by the discharging operation, and after the next switch is turned on by the discharging operation. The cell voltage of the fourth cell 4 is detected when, for example, the fourth switch 24 is turned off again by the discharging operation and the next third switch 23 is turned on by the discharging operation or thereafter .

In the above embodiment, the voltage between the ground line 60 and the fourth measuring line 64 is measured as the module voltage Em in the module voltage measuring process. However, the present invention is not limited to this, and the measurement cell voltages in the cell voltage measurement process may be summed and the summed value may be the module voltage Em. However, when the zener voltage is applied to the capacitor by, for example, disconnection, the measurement cell voltage E is not originally 6.5V but 5V due to the measurable range of the cell voltage measuring circuit 70C, and does not become an accurate value. As a result, the module voltage Em due to the sum does not become an accurate value. On the other hand, in the configuration of the above embodiment, it is possible to accurately measure the module voltage Em without affecting the measurable range.

In the above embodiment, the cell monitoring unit 70 has a configuration for executing the high potential side processing next to the low potential side processing. However, the present invention is not limited to this, and the cell monitoring unit 70 may be configured to perform the low potential side processing next to the high potential side processing, or to perform the high potential side processing and the low potential side processing in parallel. Furthermore, the cell monitoring unit 70 may be configured to execute at least one of the low potential side process and the high potential side process before the switch control process.

In the above-described embodiment, the cell monitoring unit 70 has been configured to execute the abnormal abnormality detection processing and the non-abnormality abnormality detection processing in the intermediate processing. However, the cell monitoring unit 70 is not limited to this, and may be configured so as not to execute the abnormal abnormality detection processing or the non-abnormality abnormality detection processing. In this configuration, it is possible to detect the disconnection of the intermediate measurement line connected between the cell corresponding to the high-anomaly cell voltage detected at least in the high-anomaly detection process and the cell corresponding to the low-anomaly cell voltage detected in the low-anomaly detection process .

Unlike the first to third embodiments, the switch order and the cell order may be arranged in ascending order. The switch order may be a random order instead of an ascending order or a descending order. In the above-described embodiment, the cell monitoring unit 70 has a configuration in which the control processing is executed for all the cells 1 to 4 and the switches 21 to 24. However, the present invention is not limited to this configuration, and the control process may be performed on only a part of the cells of the first to fourth cells 1 to 4 and a part of the switches corresponding to the cell. Also in this configuration, it is possible to determine the presence or absence of disconnection with respect to the voltage measuring line connected to the target cell.

1 to 4: Cells 11 to 14: Zener diodes 21 to 24: Switches 31 to 34: Discharge resistance
41 to 44: Resistance for filter 51 to 54: Capacitor for filter 60 to 64: Voltage measuring line
70: Cell monitoring unit 71: Cell monitoring unit 72: Module voltage measuring circuit
81: Battery module

Claims (12)

1. A cell monitoring device for a power storage module in which a plurality of cells are connected in series,
A plurality of zener diodes connected in parallel to each of the plurality of cells through electric wires;
A plurality of switches connected in parallel to each of the plurality of cells via electric wires; And
The control unit
Lt; / RTI &gt;
Wherein,
Switch control processing for turning off and on again at least two switches among the plurality of switches in a switch order from the one end side cell to the other end side cell of the power storage module,
The voltage between a pair of the wires connected to each of the cells is set such that after the time when the switch connected in parallel to the cell is turned off again and after the switch order is turned on, Cell voltage measurement processing for measuring the cell voltage corresponding to the cell,
An abnormality determination process for determining whether or not at least one among a plurality of cell voltages measured in the cell voltage measurement process is a high-anomaly cell voltage higher than or equal to a first threshold value and a low-anomaly cell voltage lower than or equal to a second threshold value lower than the first threshold value ,
A disconnection detecting process of detecting that the electric wire is disconnected when it is determined in the abnormality determining process that at least one of the high-anomaly cell voltage and the low-
A module voltage measuring process of measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage,
A process of calculating an estimated value which is a value obtained by dividing the module voltage by the number of cells and calculating the first threshold value and the second threshold value by multiplying the estimated value by a coefficient
, &Lt; / RTI &gt;
In the abnormality determination processing,
A low error detection process for determining whether or not the cell voltage corresponding to the cell on the other end side is the low-anomaly cell voltage in a cell order opposite to the switch order,
And a high-anomaly detection process for determining whether the cell voltage is the high-anomaly cell voltage in the cell order, with the cell voltage next to the low- Wow,
A cell voltage of the high-erroneous cell voltage is set at the head of the high-erroneous cell voltage in the high-error cell search process, process
Lt; / RTI &gt;
In the disconnection detecting process,
It is detected that the wire between the cell corresponding to the cell voltage determined to be the low-error cell voltage and the cell corresponding to the cell voltage judged to be the high-anomaly cell voltage last in the abnormality determination process is disconnected doing,
Cell monitoring device of power storage module. 1. A cell monitoring device for a power storage module in which a plurality of cells are connected in series,
A plurality of zener diodes connected in parallel to each of the plurality of cells through electric wires;
A plurality of switches connected in parallel to each of the plurality of cells via electric wires; And
The control unit
Lt; / RTI &gt;
Wherein,
Switch control processing for turning off and on again at least two switches among the plurality of switches in a switch order from the one end side cell to the other end side cell of the power storage module,
The voltage between a pair of the wires connected to each of the cells is set such that after the time when the switch connected in parallel to the cell is turned off again and after the switch order is turned on, Cell voltage measurement processing for measuring the cell voltage corresponding to the cell,
An abnormality determination process for determining whether or not at least one among a plurality of cell voltages measured in the cell voltage measurement process is a high-anomaly cell voltage higher than or equal to a first threshold value and a low-anomaly cell voltage lower than or equal to a second threshold value lower than the first threshold value ,
A disconnection detecting process of detecting that the electric wire is disconnected when it is determined in the abnormality determining process that at least one of the high-anomaly cell voltage and the low-
A module voltage measuring process of measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage,
A process of calculating an estimated value which is a value obtained by dividing the module voltage by the number of cells and calculating the first threshold value and the second threshold value by multiplying the estimated value by a coefficient
, &Lt; / RTI &gt;
In the abnormality determination processing,
High-anomaly detection processing for determining whether or not the cell voltage corresponding to the one-end cell is the high-anomaly cell voltage, in the same cell order as the switch order,
And a low-anomaly search process for determining whether the cell voltage is the low-anomaly cell voltage in the cell order, with the cell voltage next to the high-anomaly cell voltage as the head, when it is determined in the high- Wow,
And a low-error cell voltage determination unit that determines whether or not the low-anomaly cell voltage is lower than the low-anomaly cell voltage in the order of the lowest cell voltage, process
Lt; / RTI &gt;
In the disconnection detecting process,
It is detected that the electric wire between the cell corresponding to the cell voltage determined to be the high-anomaly cell voltage and the cell corresponding to the cell voltage determined to be the last low-anomaly cell voltage is disconnected doing,
Cell monitoring device of power storage module. 3. The method according to claim 1 or 2,
Wherein,
Wherein when it is judged that both of the high-erroneous cell voltage and the low-erroneous cell voltage are present in the abnormality determination process, electric wires between the cell corresponding to the high-erroneous cell voltage and the cell corresponding to the low- Detecting that it is disconnected,
Cell monitoring device of power storage module. 3. The method according to claim 1 or 2,
Wherein,
A module voltage measuring process of measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage,
A threshold changing process for changing the first threshold value and the second threshold value to a smaller value as the module voltage is smaller
Lt; RTI ID = 0.0 &gt;
Cell monitoring device of power storage module. 3. The method according to claim 1 or 2,
Wherein,
Side determination process for determining whether a plurality of cell voltages corresponding to a cell group continuing at the shortest cell or a cell group continuing at the shortest cell among the plurality of cell voltages is a short-side cell voltage at or below a third threshold value ,
Side determining unit determines that the short-circuit-side cell voltage is lower than the short-circuit-side-cell voltage when it is determined that the short- process
Lt; RTI ID = 0.0 &gt;
Cell monitoring device of power storage module. 6. The method of claim 5,
Wherein,
When it is determined in the one-side determination process that the plurality of cell voltages are the one-side abnormal cell voltages, in the abnormal determination process, the cell voltages of the cells determined as the one- ,
Cell monitoring device of power storage module. 6. The method of claim 5,
Wherein,
Calculating an estimated value which is a value obtained by dividing the module voltage by the difference between the total number of the plurality of cells and the number of cells corresponding to the cell voltage determined as the one-side abnormal cell voltage in the one-side determination processing, A threshold changing process for changing the first threshold value and the second threshold value to a smaller value as the estimated value becomes smaller
Lt; RTI ID = 0.0 &gt;
Cell monitoring device of power storage module. 5. The method of claim 4,
Wherein the upper limit value of the changing range of the first threshold value in the threshold value changing process is a maximum value of the reaction voltage value of the Zener diode or the measurable range in the cell voltage measuring process,
Cell monitoring device of power storage module. A disconnection detecting method for detecting disconnection of a wire in a monitoring apparatus including a plurality of switches and zener diodes connected in parallel to each of a plurality of cells constituting a power storage module through electric wires,
Turning on and off again at least two switches among the plurality of switches in a switch order from a cell on one end of the power storage module to a cell on the other end;
A voltage between a pair of the wires connected to each of the cells is set such that after the time when the switch connected in parallel to the cell is turned off again and after the next switch is turned on, As a cell voltage corresponding to the cell voltage;
When judging whether or not there is at least one of a cell voltage of a plurality of cells measured above and a cell voltage of a low-error cell which is lower than or equal to a first threshold value and a second low-
Determining whether the cell voltage is the low-error cell voltage in a cell order opposite to the switch order from the cell voltage corresponding to the cell on the other end side;
Determining whether the cell voltage is the high-anomaly cell voltage in the cell order, when the cell voltage is judged to be the low-error cell voltage;
Determining whether the cell voltage is the high-anomaly cell voltage in the cell order, with the cell voltage next to the high-anomaly cell voltage as a head;
Detecting that a wire between the cell corresponding to the cell voltage determined to be the low-error cell voltage and the cell corresponding to the cell voltage determined to be the high-anomaly cell voltage last in the determination is disconnected ;
Measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage; And
Calculating an estimated value which is a value obtained by dividing the module voltage by the number of cells and calculating the first threshold value and the second threshold value by multiplying the estimated value by a coefficient,
And detecting the disconnection. A disconnection detecting method for detecting disconnection of a wire in a monitoring apparatus including a plurality of switches and zener diodes connected in parallel to each of a plurality of cells constituting a power storage module through electric wires,
Turning on and off again at least two switches among the plurality of switches in a switch order from a cell on one end side of the power storage module to a cell on the other end side;
A voltage between a pair of the electric wires connected to each of the cells is set to a value obtained after the time when the switch connected in parallel to the cell is turned off again and after the switch order is turned on, Measuring a cell voltage corresponding to the cell;
Determining whether there is at least one of a plurality of measured cell voltages, a high-anomaly cell voltage equal to or higher than a first threshold value and a low-anomaly cell voltage equal to or lower than a second threshold value lower than the first threshold value;
Determining whether the cell voltage is the high-anomaly cell voltage, in the same cell order as the switch order, with the cell voltage corresponding to the cell on the one end side as the head;
Determining whether the cell voltage is the low-anomaly cell voltage in the cell order, with the cell voltage next to the high-anomaly cell voltage as a head;
Determining whether the cell voltage is lower than the lowest cell voltage in the cell order, with the cell voltage next to the lowest cell voltage as a head;
Detecting that a wire between the cell corresponding to the cell voltage determined to be the high-anomaly cell voltage and the cell corresponding to the cell voltage determined to be the low-anomaly cell voltage at the end is disconnected;
Measuring a voltage between the shortest wires connected to both ends of the plurality of cells as a module voltage; And
Calculating an estimated value which is a value obtained by dividing the module voltage by the number of cells and calculating the first threshold value and the second threshold value by multiplying the estimated value by a coefficient,
And detecting the disconnection. delete delete

Images