JP7005895B2 - Internal resistance calculation device, internal resistance calculation method and internal resistance calculation program - Google Patents

Description

The present invention relates to an internal resistance calculation device for calculating the internal resistance of a secondary battery, an internal resistance calculation method, and an internal resistance calculation program.

In recent years, vehicles such as HEVs (Hybrid Electric Vehicles) and EVs (Electric Vehicles) are becoming widespread. HEVs and EVs are equipped with secondary batteries. As the vehicle travels, switching between charging and discharging the secondary battery is repeated. Since over-discharging or over-charging deteriorates the secondary battery, it is necessary to control charging and discharging while grasping the charge amount of the secondary battery. Further, in order to determine the deterioration of the secondary battery, it is necessary to accurately grasp the internal resistance of the secondary battery.

Patent Document 1 discloses a method of calculating the internal resistance of a secondary battery mounted on a vehicle by using the current-voltage characteristics measured at the start of an engine in which a large current change and voltage change occur in a short period of time. ..

Japanese Unexamined Patent Publication No. 2008-216018

In order to calculate the internal resistance of the secondary battery, it is necessary to measure the total voltage, which is the voltage across the secondary battery. However, in general, when calculating the internal resistance, the cell voltage is measured for each cell constituting the secondary battery, and the total voltage of the secondary battery is calculated by summing the measured cell voltages. Therefore, when the current and voltage change suddenly as in the case of starting the engine, the current and voltage change between the time of the first cell voltage measurement and the time of the last cell voltage measurement. That is, there is a problem that the cell voltage cannot be measured at the same timing and the estimation accuracy of the internal resistance is lowered.

The present invention has been made to solve such a problem, and is an internal resistance calculation device capable of calculating the internal resistance with high accuracy even when the current and the voltage change suddenly. It is an object of the present invention to provide a resistance calculation method and an internal resistance calculation program.

(1) In order to achieve the above object, the internal resistance calculation device according to one embodiment of the present invention is an internal resistance calculation device for calculating the internal resistance of a secondary battery to which a plurality of cells are connected. A current measuring unit that measures the current of the secondary battery, a cell voltage measuring unit that measures the voltage of each cell, and a total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery. It is provided with an internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing. ..

(11) The internal resistance calculation method according to another embodiment of the present invention is an internal resistance calculation method for calculating the internal resistance of a secondary battery to which a plurality of cells are connected, and the current of the secondary battery is calculated. According to a predetermined timing, a current measurement step to be measured, a cell voltage measurement step to measure the voltage of each cell, a total voltage acquisition step to acquire the total voltage by measuring the total voltage of the secondary battery, and a predetermined timing. It includes an internal resistance calculation step of calculating the internal resistance of the secondary battery based on the current measured in the current measurement step and the total voltage acquired in the total voltage acquisition step.

(12) The internal resistance calculation program according to another embodiment of the present invention is an internal resistance calculation program for calculating the internal resistance of a secondary battery to which a plurality of cells are connected. A current measuring unit that measures the current of the secondary battery, a cell voltage measuring unit that measures the voltage of each cell, and a total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery. According to a predetermined timing, it functions as an internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit.

Needless to say, the internal resistance calculation program can be distributed via a computer-readable non-temporary recording medium such as a CD-ROM (Compact Disc-Read Only Memory) or a communication network such as the Internet. .. Further, the present invention can be realized as a semiconductor integrated circuit that realizes a part or all of the internal resistance calculation device, or can be realized as a system including the internal resistance calculation device.

According to the present invention, the internal resistance can be calculated with high accuracy even when the current and the voltage change suddenly.

It is a block diagram which shows an example of the structure of the main part of the vehicle equipped with the battery monitoring device as the internal resistance calculation device of this embodiment. It is a block diagram which shows an example of the structure of the battery monitoring device as the internal resistance calculation device of this embodiment. It is a figure for demonstrating the calculation method of the wiring resistance by the wiring resistance calculation part. It is a figure which shows the time change of the wiring resistance when there is no abnormality in a wiring path. It is a figure which shows the time change of the wiring resistance when there is an abnormality in a wiring path. It is a figure which shows an example of the current waveform of a secondary battery unit. It is a figure which shows an example of the current waveform of the secondary battery unit which expanded the time axis of the current waveform shown in FIG. It is a figure which shows an example of the total voltage waveform of a secondary battery unit. It is a figure which shows an example of the total voltage waveform of the secondary battery unit which expanded the time axis of the total voltage waveform shown in FIG. It is a figure for demonstrating the proper use of the voltage measuring means according to a situation. To compare the time required to calculate the internal resistance using the cell voltage calculated by the cell voltage measuring unit and the time required to calculate the internal resistance using the total voltage calculated by the total voltage acquisition unit. It is a figure. It is a flowchart which shows an example of the processing procedure of the battery monitoring apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows the processing procedure of the abnormality detection processing by a wiring resistance. It is a figure for demonstrating the acquisition process of the total voltage by the total voltage acquisition part which concerns on Embodiment 2. FIG. It is a figure for demonstrating the acquisition process of the total voltage by the total voltage acquisition part which concerns on Embodiment 3. FIG. It is a figure for demonstrating the current acquisition process by the current measuring part which concerns on Embodiment 4. FIG. It is a figure for demonstrating the current acquisition process by the current measuring part which concerns on Embodiment 5.

[Outline of Embodiment of the present invention]
First, the outline of the embodiment of the present invention will be listed and described.
(1) The internal resistance calculation device according to an embodiment of the present invention is an internal resistance calculation device that calculates the internal resistance of a secondary battery to which a plurality of cells are connected, and measures the current of the secondary battery. The current measurement unit, the cell voltage measurement unit that measures the voltage of each cell, the total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and the current according to a predetermined timing. It includes an internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the measurement unit and the total voltage acquired by the total voltage acquisition unit.

According to this configuration, the total voltage acquired by the total voltage acquisition unit is not the total value of the cell voltage but the measured value of the total voltage of the secondary battery. When the cell voltage is sequentially measured at the timing when the voltage suddenly changes, the cell voltage cannot be measured at the same time, so that the total of these cell voltages may not be an accurate total voltage. However, by measuring the total voltage, it is possible to obtain an accurate total voltage of the secondary battery. Further, the internal resistance calculation unit can calculate the internal resistance based on the measured value of the total voltage acquired by the total voltage acquisition unit. Therefore, when the current and voltage change suddenly, the internal resistance can be calculated with high accuracy by calculating the internal resistance based on the measured value of the total voltage acquired by the total voltage acquisition unit. ..

(2) Preferably, the above-mentioned internal resistance calculation device further includes an engine information acquisition unit for acquiring information regarding the engine start timing, and the internal resistance calculation unit is the engine information acquisition unit at the predetermined timing. The internal resistance is calculated based on the current measured by the current measuring unit and the total voltage acquired by the total voltage acquisition unit according to the engine start timing acquired by the engine.

According to this configuration, the internal resistance calculation unit can calculate the internal resistance based on the measured value of the total voltage acquired by the total voltage acquisition unit when the engine start timing is acquired. Further, by using the measured value of the start timing of the engine through which a large current flows, the internal resistance can be calculated after reducing the influence of the measurement error of the current and the total voltage. Therefore, the internal resistance can be calculated with high accuracy.

(3) More preferably, the total voltage acquisition unit further calculates the total voltage at the current measurement timing based on the total voltage measured at a plurality of timings, and the internal resistance calculation unit calculates the total voltage at the current measurement timing. The internal resistance is calculated based on the current measured by the current measuring unit and the total voltage at the measurement timing of the current calculated by the total voltage acquisition unit.

If the current measurement by the current measuring unit and the total voltage measurement by the total voltage acquisition unit cannot be executed in parallel, the current and the total voltage are measured at different measurement timings. Therefore, if the internal resistance is calculated using this current and the total voltage, it may not be an accurate value. However, according to this configuration, the total voltage at the current measurement timing can be calculated from the total voltage measured at a plurality of timings, and the internal resistance can be calculated based on the current and the total voltage at the measurement timing. Therefore, it is possible to reduce the calculation error of the internal resistance caused by the difference in the measurement timings of the current and the total voltage. This makes it possible to calculate the internal resistance with high accuracy.

(4) For example, the total voltage acquisition unit may calculate the total voltage at the measurement timing of the current based on the total voltage measured at a plurality of timings within the cycle in which the current is measured.

According to this configuration, the total voltage can be corrected based on the total voltage measured at a plurality of timings close to each other in time. Therefore, the total voltage at the current measurement timing can be calculated with high accuracy.

(5) Further, the total voltage acquisition unit is based on the total voltage measured in a cycle before the cycle in which the current is measured and the total voltage measured in the cycle in which the current is measured. The total voltage at the current measurement timing may be calculated.

According to this configuration, the total voltage measured in the previous cycle can be used to correct the total voltage measured in the current cycle. Therefore, it is not necessary to measure the total voltage a plurality of times within the same cycle in order to correct the total voltage. As a result, the total voltage at the current measurement timing can be calculated at high speed without increasing the measurement load of the total voltage.

(6) Further, the current measuring unit further calculates the current at the measurement timing of the total voltage by the total voltage acquisition unit based on the current measured at a plurality of timings, and the internal resistance calculation unit calculates the current. The internal resistance may be calculated based on the current at the measurement timing of the total voltage calculated by the current measuring unit and the total voltage acquired by the total voltage acquiring unit.

If the current measurement by the current measuring unit and the total voltage measurement by the total voltage acquisition unit cannot be executed in parallel, the current and the total voltage are measured at different measurement timings. Therefore, if the internal resistance is calculated using this current and the total voltage, it may not be an accurate value. However, according to this configuration, the current at the measurement timing of the total voltage can be calculated from the currents measured at a plurality of timings, and the internal resistance can be calculated based on the current and the total voltage at the measurement timings. Therefore, it is possible to reduce the calculation error of the internal resistance caused by the difference in the measurement timings of the current and the total voltage. This makes it possible to calculate the internal resistance with high accuracy.

(7) For example, the current measuring unit calculates the current at the measurement timing of the total voltage based on the current measured at a plurality of timings within the cycle in which the total voltage acquisition unit measures the total voltage. You may.

According to this configuration, the current can be corrected based on the currents measured at a plurality of timings close to each other in time. Therefore, the current at the measurement timing of the total voltage can be calculated with high accuracy.

(8) Further, the current measuring unit includes the current measured in a cycle before the cycle in which the total voltage acquisition unit measures the total voltage, and the current measured in the cycle in which the total voltage is measured. The current at the measurement timing of the total voltage may be calculated based on the above.

According to this configuration, the current measured in the previous cycle can be used to correct the current measured in the current cycle. Therefore, it is not necessary to measure the current a plurality of times within the same cycle in order to correct the current. As a result, the current at the measurement timing of the total voltage can be calculated at high speed without increasing the current measurement load.

(9) More preferably, the above-mentioned internal resistance calculation device further preferables the total voltage based on the voltage of each cell measured by the cell voltage measuring unit and the total voltage acquired by the total voltage acquisition unit. The total voltage is measured by the total voltage acquisition unit based on the wiring resistance calculation unit that calculates the wiring resistance generated in the total voltage acquisition path by the voltage acquisition unit and the wiring resistance calculated by the wiring resistance calculation unit. It is provided with an abnormality detection unit that detects an abnormality that occurs in the wiring path for the purpose.

If the wiring path is broken or has poor contact, the wiring resistance will increase. Therefore, according to this configuration, it is possible to detect an abnormality occurring in the wiring path based on the wiring resistance.

(10) Further, the above-mentioned internal resistance calculation device further acquires the total voltage based on the voltage of each cell measured by the cell voltage measuring unit and the total voltage acquired by the total voltage acquisition unit. The total voltage acquisition unit includes a wiring resistance calculation unit that calculates the wiring resistance generated in the total voltage acquisition path by the unit, and the total voltage acquisition unit is based on the wiring resistance calculated by the wiring resistance calculation unit. The voltage may be corrected.

According to this configuration, the total voltage can be corrected so as to eliminate the influence of the voltage drop due to the wiring resistance that occurs in the acquisition path of the total voltage. As a result, the original total voltage can be calculated, and the internal resistance can be calculated accurately.

(11) The internal resistance calculation method according to another embodiment of the present invention is an internal resistance calculation method for calculating the internal resistance of a secondary battery to which a plurality of cells are connected, and the current of the secondary battery is calculated. According to a predetermined timing, a current measurement step to be measured, a cell voltage measurement step to measure the voltage of each cell, a total voltage acquisition step to acquire the total voltage by measuring the total voltage of the secondary battery, and a predetermined timing. It includes an internal resistance calculation step of calculating the internal resistance of the secondary battery based on the current measured in the current measurement step and the total voltage acquired in the total voltage acquisition step.

This configuration includes steps corresponding to each processing unit of the internal resistance calculation device described above. Therefore, the same operation and effect as the above-mentioned internal resistance calculation device can be obtained.

(12) The internal resistance calculation program according to another embodiment of the present invention is an internal resistance calculation program for calculating the internal resistance of a secondary battery to which a plurality of cells are connected. A current measuring unit that measures the current of the secondary battery, a cell voltage measuring unit that measures the voltage of each cell, and a total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery. According to a predetermined timing, it functions as an internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit.

According to this configuration, the computer can function as each processing unit of the above-mentioned internal resistance calculation device. Therefore, the same operation and effect as the above-mentioned internal resistance calculation device can be obtained.

[Details of Embodiments of the present invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, all of the embodiments described below show a preferable specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, the order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. The present invention is specified by the scope of claims. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest concept of the present invention are not necessarily necessary for achieving the object of the present invention, but more. Described as constituting a preferred embodiment.

(Embodiment 1)
FIG. 1 is a block diagram showing an example of the configuration of a main part of a vehicle equipped with a battery monitoring device 100 as an internal resistance calculation device of the present embodiment.

As shown in FIG. 1, in addition to the battery monitoring device 100, the vehicle includes a secondary battery unit 50, relays 61, 62, 63, a generator (ALT) 71, a starter motor (ST) 72, a battery 73, and an electric load. It is equipped with 74, 75 and the like.

The secondary battery unit 50 is, for example, a lithium ion battery, and a plurality of cells 51 are connected in series. The secondary battery unit 50 includes a current sensor 52 connected to the ends of the plurality of cells 51. The secondary battery unit 50 may be provided with a temperature sensor (not shown).

The current sensor 52 is composed of, for example, a shunt resistor or a Hall sensor, and detects the charge current and the discharge current of the secondary battery unit 50. The current sensor 52 outputs the current detected via the current detection line 50c to the battery monitoring device 100.

The end of each cell 51 and the battery monitoring device 100 are connected by a cell voltage detection line 50a for cell voltage measurement by the battery monitoring device 100. Further, both ends of the secondary battery unit 50 and the battery monitoring device 100 are connected by a total voltage detection line 50b for detecting the voltage across the secondary battery unit 50 by the battery monitoring device 100. Hereinafter, the voltage across the secondary battery unit 50 is also referred to as a total voltage. The total voltage detection line 50b and the cell voltage detection lines 50a at both ends of the secondary battery unit 50 may be used as a common signal line.

The battery 73 is, for example, a lead battery, which supplies electric power to an electric load 74 (for example, a light, various motors, various controllers, etc.) of a vehicle, and drives a starter motor 72 when the relay 63 is turned on. Power supply for this. The generator 71 generates electricity by the rotation of the engine of the vehicle, and outputs direct current by a rectifier circuit provided inside to charge the battery 73. Further, the generator 71 charges the battery 73 and the secondary battery unit 50 when the relays 61 and 62 are turned on. When the relay 61 is turned on, the secondary battery unit 50 supplies electric power to the electric load 75 (for example, engine system electrical equipment, audio, etc.). The relays 61, 62, and 63 are turned on and off by a relay control unit (not shown) in order to distribute the supplied power according to the charge / discharge balance of the battery 73 and the secondary battery unit 50 and the degree of load.

FIG. 2 is a block diagram showing an example of the configuration of the battery monitoring device 100 as the internal resistance calculation device of the present embodiment. The battery monitoring device 100 includes a control unit 10 that controls the entire device, a current measurement unit 11, a cell voltage measurement unit 12, a total voltage acquisition unit 14, an internal resistance calculation unit 15, a communication unit 16, a wiring resistance calculation unit 17, and an abnormality detection. A unit 18, a storage unit 19 for storing predetermined information, a timer 20 for timing, and the like are provided. The battery monitoring device 100 may be provided with a temperature measuring unit (not shown).

The control unit 10 is composed of a CPU (Central Processing Unit) and the like.

The current measuring unit 11 measures the current (charging current and discharging current) of the secondary battery unit 50. That is, the current measuring unit 11 includes an AD (Analog to Digital) converter, converts the current acquired from the current sensor 52 via the current detection line 50c into a digital value at a predetermined sampling cycle, and converts the converted digital value. Is output to the control unit 10. The sampling cycle can be, for example, a first sampling cycle (for example, 10 ms) and a second sampling cycle (for example, 1 ms) shorter than the first sampling cycle. The sampling period of 10 ms and 1 ms is an example, and is not limited to such a numerical value. As a result, the control unit 10 can read the current value of the secondary battery unit 50 in the first sampling cycle and the second sampling cycle.

The cell voltage measuring unit 12 is connected to the cell voltage detection line 50a and measures the voltage of each cell 51 of the secondary battery unit 50. For example, the cell voltage measuring unit 12 is configured to include a voltage monitoring IC (Integrated Circuit) including an AFE (Analog Front End), and converts the voltage measured by the voltage monitoring IC into a digital value at a predetermined sampling cycle. , The converted digital value is output to the control unit 10. The sampling period can be, for example, a first sampling period (for example, 10 ms). The sampling period of 10 ms is an example and is not limited to such a numerical value. As a result, the control unit 10 can read the voltage value of each cell 51 in the first sampling cycle.

The total voltage acquisition unit 14 acquires the total voltage of the secondary battery unit 50 by measuring the total voltage of the secondary battery unit 50. For example, the total voltage acquisition unit 14 is configured to include a microcomputer, converts a voltage measured by the microcomputer into a digital value at a predetermined sampling cycle, and outputs the converted digital value to the control unit 10. The sampling cycle can be, for example, a second sampling cycle (for example, 1 ms) shorter than the first sampling cycle. The sampling period of 1 ms is an example and is not limited to such a numerical value. As a result, the control unit 10 can read the total voltage of the secondary battery unit 50 in the second sampling cycle.

The internal resistance calculation unit 15 is inside the secondary battery unit 50 based on the current measured by the current measurement unit 11 and the total voltage of the secondary battery unit 50 acquired by the total voltage acquisition unit 14 according to a predetermined timing. Calculate the resistance. That is, the internal resistance calculation unit 15 has a total voltage V0 which is the total value of the voltages of each cell 51 measured by the cell voltage measurement unit 12 at a certain timing before the engine start timing and a current I0 measured by the current measurement unit 11. , The internal resistance of the secondary battery unit 50 based on the peak total voltage Vp acquired by the total voltage acquisition unit 14 and the peak current Ip measured by the current measurement unit 11 at the timing when the current peaks after the engine start timing. Is calculated.

The secondary battery unit 50 can be represented by an equivalent circuit composed of the resistance Rs of the electrolytic solution bulk, the interfacial charge transfer resistance Rc, the electric double layer capacitance C, and the diffusion impedance Zw. The internal resistance of the secondary battery unit 50 is dominated by the resistance Rs of the electrolytic solution bulk and the interfacial charge transfer resistance Rc. On the other hand, in the impedance spectrum obtained by plotting the values obtained by measuring the impedance of the secondary battery unit 50 at a plurality of frequencies using the AC impedance method, when the frequency is changed from a high frequency to a low frequency, it spreads in a certain boundary frequency range. The impedance Zw increases, and the impedance of the secondary battery unit 50 increases.

The absolute value of the slope of a straight line obtained from the voltage and current between the two points before and after switching between charging and discharging indicates the internal resistance of the secondary battery unit 50. Therefore, the internal resistance R is calculated by, for example, R = (Vp-V0) / (Ip-I0).

The communication unit 16 has a function as an engine information acquisition unit, and acquires information regarding engine start timing. For example, the communication unit 16 may acquire timing information when the ignition switch of the vehicle is turned on from an ECU (Electronic Control Unit), a junction box, or the like via an in-vehicle LAN.

The wiring resistance calculation unit 17 is a total voltage acquisition unit 14 based on the voltage of each cell 51 measured by the cell voltage measurement unit 12 and the total voltage of the secondary battery unit 50 acquired by the total voltage acquisition unit 14. The wiring resistance generated in the voltage acquisition path (including the cell voltage detection line 50a) is calculated.

FIG. 3 is a diagram for explaining a method of calculating the wiring resistance by the wiring resistance calculation unit 17. The voltage of the cell 51 measured by the cell voltage measuring unit 12 is Vck (k = 1 to n), and the total voltage of the secondary battery unit 50 measured by the total voltage acquisition unit 14 is Vm. Further, let i be the current flowing through the secondary battery unit 50. Further, the wiring resistance generated in the total voltage detection line 50b from one end of the secondary battery unit 50 to the cell voltage measuring unit 12 is set to rh1, and from the other end of the secondary battery unit 50 to the cell voltage measuring unit 12. Let rh2 be the wiring resistance generated in the total voltage detection line 50b. The wiring resistances rh1 and rh2 referred to here include, in addition to the wiring resistance generated in the total voltage detection line 50b, the contact resistance of the connection component connecting the total voltage acquisition unit 14 and the secondary battery unit 50.

The wiring resistance calculation unit 17 calculates the wiring resistance rh generated in the total voltage acquisition path by the total voltage acquisition unit 14 by the following equation 1.

The abnormality detection unit 18 detects an abnormality that occurs in the wiring path for measuring the total voltage by the total voltage acquisition unit 14 based on the wiring resistance calculated by the wiring resistance calculation unit 17. For example, when the total voltage detection line 50b is broken or a contact failure occurs in the contact component, the value of the wiring resistance becomes large. Therefore, the abnormality detection unit 18 detects an abnormality based on the wiring resistance calculated by the wiring resistance calculation unit 17 and a predetermined abnormality determination threshold value.

Next, the abnormality detection by the abnormality detection unit 18 will be specifically described. FIG. 4 is a diagram showing a time change of wiring resistance when there is no abnormality in the wiring path. FIG. 5 is a diagram showing a time change of wiring resistance when there is an abnormality in the wiring path. The horizontal axis of FIGS. 4 and 5 indicates time, and the vertical axis indicates the value of wiring resistance calculated by the wiring resistance calculation unit 17. FIG. 4 shows the change in wiring resistance when there is no abnormality in the wiring path, and FIG. 5 shows the change in wiring resistance when there is an abnormality in the wiring path.

As shown in FIG. 4, when there is no abnormality in the wiring path, the value of the wiring resistance is less than the abnormality determination threshold value. On the other hand, as shown in FIG. 5, when an abnormality occurs in the wiring path, the value of the wiring resistance becomes equal to or higher than the abnormality determination threshold value, and the state continues. Therefore, for example, the abnormality detection unit 18 detects an abnormality when it continuously detects that the wiring resistance has reached the abnormality determination threshold value or more a predetermined number of times (for example, 10 times) or more. Alternatively, the abnormality detection unit 18 detects an abnormality when it continuously detects that the wiring resistance has reached the abnormality determination threshold value or more for a predetermined time (for example, 100 msec) or more.

FIG. 6 is a diagram showing an example of the current waveform of the secondary battery unit 50. In FIG. 6, the horizontal axis represents time and the vertical axis represents current. When the current is positive, it indicates the discharge current, and when the current is negative, it indicates the charge current. FIG. 7 is a diagram showing an example of the current waveform of the secondary battery unit 50 in which the time axis of the current waveform shown in FIG. 6 is enlarged. FIG. 7 shows the current waveforms before and after the engine is started. The meanings of the horizontal axis and the vertical axis in FIG. 7 are the same as those in FIG. As shown in FIGS. 6 and 7, it can be seen that when the engine is started, a large current is discharged from the secondary battery unit 50, and the discharge current of the secondary battery unit 50 changes sharply.

FIG. 8 is a diagram showing an example of the total voltage waveform of the secondary battery unit 50. In FIG. 8, the horizontal axis shows the same time as in FIG. 6, and the vertical axis shows the total voltage of the secondary battery unit 50. FIG. 9 is a diagram showing an example of the total voltage waveform of the secondary battery unit 50 in which the time axis of the total voltage waveform shown in FIG. 8 is enlarged. FIG. 9 shows the total voltage waveform before and after the engine is started. In FIG. 9, the horizontal axis shows the same time as in FIG. 7, and the vertical axis shows the total voltage of the secondary battery unit 50. As shown in FIGS. 8 and 9, the voltage of the secondary battery unit 50 drops sharply when the engine is started.

Since the engine start time has a large change in current and voltage, the internal resistance can be obtained with high accuracy. On the other hand, since the changes in current and voltage are rapid, the time required for total voltage measurement is strict.

FIG. 10 is a diagram for explaining proper use of the voltage measuring means according to the situation.

As shown in FIG. 2, the voltage measuring means includes a cell voltage measuring unit 12 and a total voltage acquiring unit 14. The battery monitoring device 100 properly uses these depending on the situation. That is, as shown in FIG. 10, when the engine is started, the required accuracy of voltage measurement is low, but the required time of voltage measurement is small. Therefore, the processing cycle of the internal resistance calculation process is, for example, 1 msec. On the other hand, in normal times other than when the engine is started, the required accuracy of voltage measurement is high, but the required time of voltage measurement is relatively long. Therefore, the processing cycle of the internal resistance calculation process is, for example, 10 msec. In order to measure the total voltage of the secondary battery unit 50 required for calculating the internal resistance, the cell voltage measuring unit 12 must measure the voltage for the number of cells 51. On the other hand, the total voltage acquisition unit 14 can measure the total voltage of the secondary battery unit 50 at one time. On the other hand, the cell voltage measuring unit 12 usually has higher measurement accuracy. Therefore, when the engine is started, the total voltage acquisition unit 14 measures the total voltage of the secondary battery unit 50 at high speed, and normally, the cell voltage measurement unit 12 measures the voltage of each cell 51 with high accuracy.

FIG. 11 shows the time required to calculate the internal resistance using the cell voltage calculated by the cell voltage measuring unit 12 and the time required to calculate the internal resistance using the total voltage calculated by the total voltage acquisition unit 14. It is a figure for comparison with.

As shown in FIG. 11A, when the internal resistance is calculated using the cell voltage calculated by the cell voltage measuring unit 12, the current measuring unit 11 first measures the current, and then the cell voltage measurement. The unit 12 measures the cell voltage for each cell 51. The internal resistance calculation unit 15 calculates the total voltage of the secondary battery unit 50 by totaling the cell voltages, calculates the internal resistance based on the measured current and the calculated total current, and outputs the calculation result to the control unit 10. Send. However, the order of current measurement and cell voltage measurement may be reversed.

On the other hand, as shown in FIG. 11B, when the internal resistance is calculated using the total voltage calculated by the total voltage acquisition unit 14, the current measurement unit 11 first measures the current, and then the total voltage is calculated. The voltage acquisition unit 14 measures the total voltage of the secondary battery unit 50. Next, the internal resistance calculation unit 15 calculates the internal resistance using the measured current and the total voltage, and transmits the calculation result to the control unit 10. However, the order of current measurement and cell voltage measurement may be reversed.

As shown in FIG. 11A, when the cell voltage measuring unit 12 is used, the cell voltage must be measured a plurality of times, whereas as shown in FIG. 11B, the total voltage is measured. When the acquisition unit 14 is used, the total voltage need only be measured once. Therefore, the time required to acquire the total voltage can be significantly shortened. Further, as shown in FIG. 11A, when the cell voltage measuring unit 12 is used, the measurement timing of the voltage of each cell 51 is different, so that even if these cell voltages are totaled, the total voltage is accurate. May not be. In particular, it is difficult to calculate an accurate total voltage at the timing when the cell voltage changes suddenly, such as when the engine is started. Therefore, when the engine is started, as shown in FIG. 11B, it is better to measure the total voltage once by using the total voltage acquisition unit 14, so that the total voltage can be calculated more accurately.

FIG. 12 is a flowchart showing an example of the processing procedure of the battery monitoring device 100 according to the first embodiment.

The control unit 10 sets the current and voltage sampling cycles to 10 msec (S2). Further, the control unit 10 sets the current measurement range by the current measurement unit 11 to 200A (S4). As a result, the current measuring unit 11 can measure the discharge current within the range of ± 200 A.

The current measuring unit 11 measures the current of the secondary battery unit 50 at intervals of 10 msec, and the cell voltage measuring unit 12 measures the voltages of the plurality of cells 51 constituting the secondary battery unit 50 at intervals of 10 msec for each cell 51. (S6).

The control unit 10 determines whether or not the engine start has been detected by the communication unit 16 acquiring information regarding the engine start timing (S8). The process of step S6 is repeatedly executed until the start of the engine is detected.

When the start of the engine is detected (YES in S8), the control unit 10 stores the last measured current as the reference current I0 in the storage unit 19. Further, the control unit 10 stores the reference total voltage V0, which is the total value of the voltages of the plurality of cells 51 measured last, in the storage unit 19 (S10).

The control unit 10 sets the current and voltage sampling cycles to 1 msec (S12). Further, the control unit 10 sets the current measurement range by the current measurement unit 11 to 1600 A (S14). As a result, the current measuring unit 11 can measure the discharge current within the range of ± 1600 A. However, the resolution of the detected current is lower than that in the case where the measurement range is 200 A.

The current measuring unit 11 measures the current of the secondary battery unit 50 at 1 msec intervals, and the total voltage acquisition unit 14 measures the total voltage of the secondary battery unit 50 at 1 msec intervals (S16). The measured current and total voltage are held in the storage unit 19 for a certain period of time.

The control unit 10 determines whether or not the current measured by the current measurement unit 11 has reached the peak (S20). That is, the control unit 10 determines whether or not the current measured by the current measurement unit 11 is equal to or higher than the predetermined engine start determination threshold value and the current measured this time is smaller than the current measured last time. do. The engine start determination threshold value can be, for example, 150A. However, the engine start determination threshold value is not limited to 150A, and may be any other value. With reference to FIG. 7, for example, the current 31 is equal to or higher than the engine start determination threshold value and is smaller than the current 30 measured in the previous sampling cycle. Therefore, since the current 31 satisfies the above condition, the current 30 measured in the previous sampling cycle is defined as the peak current Ip. Further, the total voltage 40 shown in FIG. 9 measured in the same sampling period as the peak current is defined as the peak total voltage Vp.

The internal resistance calculation unit 15 acquires the reference current I0, the reference total voltage V0, the peak current Ip, and the peak total voltage Vp by reading them from the storage unit 19 (S22).

The internal resistance calculation unit 15 calculates the internal resistance R using these read values (S24). The internal resistance R is calculated by, for example, R = (Vp-V0) / (Ip-I0).

The control unit 10 sets the current and voltage sampling cycles to 10 msec (S26).

The current measuring unit 11 measures the current of the secondary battery unit 50 at intervals of 10 msec, and the cell voltage measuring unit 12 measures the voltages of the plurality of cells 51 constituting the secondary battery unit 50 at intervals of 10 msec for each cell 51. (S28).

The control unit 10 determines whether or not the measured current value is below the stable state determination threshold value (for example, a value between 120 and 200 A (eg, 150 A)) (S30). The value of the stable state determination threshold value is an example, and may be selected from other ranges.

If the current value is not lower than the stable state determination threshold value (NO in S30), the process returns to step S28. If the current value is below the stable state determination threshold value (YES in S30), it can be determined that the current that has increased sharply when the engine is started is stable. Therefore, the control unit 10 resets the current measurement range to 200A (S32).

After that, the current of the secondary battery unit 50 is measured at intervals of 10 msec, and the cell voltage measuring unit 12 measures the voltages of the plurality of cells 51 constituting the secondary battery unit 50 at intervals of 10 msec for each cell 51. (S34).

According to the processing flow described above, the internal resistance of the secondary battery unit 50 can be accurately calculated by using the peak current Ip and the peak total voltage Vp at the time of starting the engine.

FIG. 13 is a flowchart showing a processing procedure of abnormality detection processing by wiring resistance. The process shown in FIG. 13 is executed in parallel with the internal resistance calculation process shown in FIG.

The cell voltage measuring unit 12 measures the voltage of a plurality of cells 51 constituting the secondary battery unit 50 for each cell 51 (S51).
The total voltage acquisition unit 14 measures the total voltage of the secondary battery unit 50 (S52).

The wiring resistance calculation unit 17 calculates the wiring resistance r generated in the total voltage acquisition path by the total voltage acquisition unit 14 according to the above equation 1 (S53).

The abnormality detection unit 18 determines whether or not it has continuously detected that the wiring resistance r has reached the abnormality determination threshold value or more a predetermined number of times (for example, 10 times) (S54). If the result of the determination is negative (NO in S54), the process returns to step S51.

If the result of the determination is affirmative (YES in S54), the control unit 10 transmits a charge / discharge stop instruction signal to the secondary battery unit 50 via the communication unit 16 (S55). As a result, the secondary battery unit 50 stops charging / discharging.

As described above, according to the first embodiment, the total voltage acquired by the total voltage acquisition unit 14 is not the total value of the cell voltage but the measured value of the total voltage of the secondary battery unit 50. If the cell voltage is measured sequentially at the timing when the current and voltage change suddenly, such as when the engine starts, the cell voltage cannot be measured at the same time, so even if these cell voltages are totaled, the total voltage is accurate. May not be the case. However, by measuring the total voltage by the total voltage acquisition unit 14, it is possible to acquire an accurate total voltage of the secondary battery. Further, the internal resistance calculation unit 15 can calculate the internal resistance based on the measured value of the total voltage acquired by the total voltage acquisition unit 14. Therefore, when the current and voltage change suddenly, the internal resistance can be calculated with high accuracy by calculating the internal resistance based on the measured value of the total voltage acquired by the total voltage acquisition unit 14. can.

Further, the internal resistance calculation unit 15 calculates the internal resistance based on the measured value of the total voltage acquired by the total voltage acquisition unit 14 when the communication unit 16 acquires the engine start timing. In this way, by using the measured value of the start timing of the engine through which a large current flows, the internal resistance can be calculated while reducing the influence of the measurement error of the current and the total voltage. Therefore, the internal resistance can be calculated with high accuracy.

Further, the abnormality detection unit 18 detects an abnormality in the wiring path based on the wiring resistance generated in the total voltage acquisition path by the total voltage acquisition unit 14 calculated by the wiring resistance calculation unit 17. If the wiring path is broken or has poor contact, the wiring resistance will increase. Therefore, according to the abnormality detecting unit 18, it is possible to accurately detect an abnormality occurring in the wiring path.

The total voltage acquisition unit 14 may correct the measured total voltage of the secondary battery unit 50 based on the wiring resistance calculated by the wiring resistance calculation unit 17. For example, when the wiring resistance is rh, the measured value of the total voltage is Vm, the measured value of the current is Im, and the corrected value of the total voltage is Vc, the total voltage acquisition unit 14 uses the following equation 2 to set the total voltage Vm. Is corrected to the total voltage Vc. This makes it possible to calculate the total voltage Vc when there is no voltage drop due to the wiring resistance rh.
Vc = Vm + Im × rh… (Equation 2)

That is, the total voltage can be corrected so as to eliminate the influence of the voltage drop due to the wiring resistance that occurs in the acquisition path of the total voltage. As a result, the original total voltage can be calculated, and the internal resistance can be calculated accurately.

Further, the total voltage acquisition unit 14 may correct the total voltage by using the wiring resistance rh obtained in advance at a timing other than when the engine is started. As a result, the voltage measurement accuracy can be improved without increasing the measurement time when the engine is started.

(Embodiment 2)
In the following embodiments, the same reference numerals are given to the same components as those in the first embodiment. Since the function is the same, the explanation will be omitted as appropriate, and the differences will be mainly explained.

In the first embodiment, the total voltage acquisition unit 14 measures the total voltage of the secondary battery unit 50, so that the total voltage can be accurately measured even when the current and the current change abruptly.

However, as shown in FIG. 11B, the current and the total voltage can be measured only sequentially, and the current measurement timing and the total voltage measurement timing may not match. When the internal resistance of the secondary battery unit 50 is calculated using the current and the total voltage measured at different measurement timings, a calculation error may occur due to the difference in the measurement timings. Therefore, in the second embodiment, a method of calculating the internal resistance using the current and the total voltage at the same measurement timing will be described even when the current and the total voltage can be measured only sequentially.

FIG. 14 is a diagram for explaining the total voltage acquisition process by the total voltage acquisition unit 14 according to the second embodiment.

For example, in the processing cycle n of the internal resistance calculation process, the total voltage acquisition unit 14 measures the total voltage V1 (n) of the secondary battery unit 50. After that, the current measuring unit 11 measures the current A (n) of the secondary battery unit 50. After that, the total voltage acquisition unit 14 measures the total voltage V2 (n) of the secondary battery unit 50. That is, the total voltage is measured before and after the current measurement in one processing cycle.

The total voltage acquisition unit 14 calculates the total voltage Vfix (n) of the secondary battery unit 50 at the measurement timing of the current A (n) by the following equation 3.
Vfix (n) = (V1 (n) + V2 (n)) / 2 ... (Equation 3)

This is to calculate the total voltage at the measurement timing of the current A (n) by assuming that the total voltage changes locally and linearly.

The internal resistance calculation unit 15 internally is based on the current A (n) measured by the current measurement unit 11 and the total voltage Vfix (n) at the measurement timing of the current A (n) calculated by the total voltage acquisition unit 14. Calculate the resistance. For example, the internal resistance calculation unit 15 calculates the internal resistance R by R = (Vfix (n) -V0) / (A (n) -I0). Here, I0 and V0 are a reference current and a reference total voltage, respectively.

The same processing is executed in another processing cycle such as the processing cycle (n + 1).

According to the second embodiment, the total voltage at the current measurement timing can be calculated from the total voltage measured at a plurality of timings, and the internal resistance can be calculated based on the current and the total voltage at the measurement timing. Therefore, it is possible to reduce the calculation error of the internal resistance caused by the difference in the measurement timings of the current and the total voltage. This makes it possible to calculate the internal resistance with high accuracy.

In addition, the total voltage can be corrected based on the total voltage measured at a plurality of timings that are close in time. Therefore, the total voltage at the current measurement timing can be calculated with high accuracy.

(Embodiment 3)
In the third embodiment, another method of calculating the internal resistance using the current and the total voltage at the same measurement timing will be described.

FIG. 15 is a diagram for explaining the total voltage acquisition process by the total voltage acquisition unit 14 according to the third embodiment.

For example, in the processing cycle n of the internal resistance calculation process, the current measuring unit 11 measures the current A (n) of the secondary battery unit 50. After that, the total voltage acquisition unit 14 measures the total voltage V (n) of the secondary battery unit 50. In the processing cycle (n + 1) of the internal resistance calculation process, the current measuring unit 11 measures the current A (n + 1) of the secondary battery unit 50. After that, the total voltage acquisition unit 14 measures the total voltage V (n + 1) of the secondary battery unit 50.

The total voltage acquisition unit 14 calculates the total voltage Vfix (n + 1) of the secondary battery unit 50 at the measurement timing of the current A (n + 1) by the following equation 4. Here, the measurement timings of the total voltage V (n) and the total voltage V (n + 1) are Tv (n) and Tv (n + 1), respectively, and the measurement timing of the current A (n + 1) is Ta (n + 1). ..

This is to calculate the total voltage at the measurement timing of the current A (n + 1) by assuming that the total voltage changes locally and linearly.

The internal resistance calculation unit 15 internally is based on the current A (n + 1) measured by the current measurement unit 11 and the total voltage Vfix (n + 1) at the acquisition timing of the current A (n + 1) calculated by the total voltage acquisition unit 14. Calculate the resistance. For example, the internal resistance calculation unit 15 calculates the internal resistance R by R = (Vfix (n + 1) -V0) / (A (n + 1) -I0). Here, I0 and V0 are a reference current and a reference total voltage, respectively.
The same processing is executed in other processing cycles.

According to the third embodiment, the total voltage at the current measurement timing can be calculated from the total voltage measured at a plurality of timings, and the internal resistance can be calculated based on the current and the total voltage at the measurement timing. Therefore, it is possible to reduce the calculation error of the internal resistance caused by the difference in the measurement timings of the current and the total voltage. This makes it possible to calculate the internal resistance with high accuracy.

Further, the total voltage measured in the current processing cycle can be corrected by using the total voltage measured in the previous processing cycle. Therefore, it is not necessary to measure the total voltage a plurality of times within the same processing cycle in order to correct the total voltage. As a result, the total voltage at the current measurement timing can be calculated at high speed without increasing the measurement load of the total voltage.

(Embodiment 4)
In the fourth embodiment, another method of calculating the internal resistance using the current and the total voltage at the same measurement timing will be described.

FIG. 16 is a diagram for explaining a current acquisition process by the current measuring unit 11 according to the fourth embodiment.

For example, in the processing cycle n of the internal resistance calculation process, the current measuring unit 11 measures the current A1 (n) of the secondary battery unit 50. After that, the total voltage acquisition unit 14 measures the total voltage V (n) of the secondary battery unit 50. After that, the current measuring unit 11 measures the current A2 (n) of the secondary battery unit 50. That is, the current is measured before and after the total voltage measurement within one processing cycle.

The current measuring unit 11 calculates the current Afix (n) of the secondary battery unit 50 at the measurement timing of the total voltage V (n) by the following equation 5.
Afix (n) = (A1 (n) + A2 (n)) / 2 ... (Equation 5)

This is to calculate the current at the measurement timing of the total voltage V (n) by assuming that the current changes locally and linearly.

The internal resistance calculation unit 15 is based on the current Afix (n) at the measurement timing of the total voltage v (n) calculated by the current measurement unit 11 and the total voltage V (n) measured by the total voltage acquisition unit 14. Calculate the internal resistance. For example, the internal resistance calculation unit 15 calculates the internal resistance R by R = (V (n) −V0) / (Afix (n) −I0). Here, I0 and V0 are a reference current and a reference total voltage, respectively.

The same processing is executed in another processing cycle such as the processing cycle (n + 1).

According to the fourth embodiment, the current at the measurement timing of the total voltage can be calculated from the currents measured at a plurality of timings, and the internal resistance can be calculated based on the current and the total voltage at the measurement timings. Therefore, it is possible to reduce the calculation error of the internal resistance caused by the difference in the measurement timings of the current and the total voltage. This makes it possible to calculate the internal resistance with high accuracy.

In addition, the current can be corrected based on the currents measured at a plurality of timings that are close in time. Therefore, the current at the measurement timing of the total voltage can be calculated with high accuracy.

(Embodiment 5)
In the fifth embodiment, another method of calculating the internal resistance using the current and the total voltage at the same measurement timing will be described.

FIG. 17 is a diagram for explaining a current acquisition process by the current measuring unit 11 according to the fifth embodiment.

For example, in the processing cycle n of the internal resistance calculation process, the total voltage acquisition unit 14 measures the total voltage V (n) of the secondary battery unit 50. After that, the current measuring unit 11 measures the current A (n) of the secondary battery unit 50. In the processing cycle (n + 1) of the internal resistance calculation process, the total voltage acquisition unit 14 measures the total voltage V (n + 1) of the secondary battery unit 50. After that, the current measuring unit 11 measures the current A (n + 1) of the secondary battery unit 50.

The current measuring unit 11 calculates the current Afix (n + 1) of the secondary battery unit 50 at the measurement timing of the total voltage V (n + 1) by the following equation 6. Here, the measurement timings of the current A (n) and the current A (n + 1) are Ta (n) and Ta (n + 1), respectively, and the measurement timing of the total voltage V (n + 1) is Tv (n + 1).

This is to calculate the current at the measurement timing of the total voltage V (n + 1) by assuming that the current changes linearly locally.

The internal resistance calculation unit 15 is based on the current Afix (n + 1) at the measurement timing of the total voltage v (n) calculated by the current measurement unit 11 and the total voltage V (n + 1) measured by the total voltage acquisition unit 14. Calculate the internal resistance. For example, the internal resistance calculation unit 15 calculates the internal resistance R by R = (V (n + 1) -V0) / (Afix (n + 1) -I0). Here, I0 and V0 are a reference current and a reference total voltage, respectively.
The same processing is executed in other processing cycles.

According to the fifth embodiment, the current at the measurement timing of the total voltage can be calculated from the currents measured at a plurality of timings, and the internal resistance can be calculated based on the current and the total voltage at the measurement timings. Therefore, it is possible to reduce the calculation error of the internal resistance caused by the difference in the measurement timings of the current and the total voltage. This makes it possible to calculate the internal resistance with high accuracy.

In addition, the current measured in the current cycle can be used to correct the current measured in the current cycle. Therefore, it is not necessary to measure the current a plurality of times within the same cycle in order to correct the current. As a result, the current at the measurement timing of the total voltage can be calculated at high speed without increasing the current measurement load.

Although the battery monitoring device 100 according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.

For example, in the above-described embodiment, the cells 51 constituting the secondary battery unit 50 are connected in series, but the cells 51 may be series-paralleled.

Specifically, the battery monitoring device 100 may be configured as a computer including a microprocessor, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. A computer program is stored in the RAM or ROM. The battery monitoring device 100 achieves its function by operating the microprocessor according to a computer program. Here, a computer program is configured by combining a plurality of instruction codes indicating commands to a computer in order to achieve a predetermined function.

Further, a part or all of the components constituting the battery monitoring device 100 may be composed of one system LSI. A system LSI is a super-multifunctional LSI manufactured by integrating a plurality of components on one chip, and specifically, is a computer system including a microprocessor, ROM, RAM, and the like. .. A computer program is stored in the RAM or ROM. The system LSI achieves its function by operating the microprocessor according to the computer program.

Further, the present invention may be the method shown above. Further, the present invention may be a computer program that realizes these methods by a computer.

Further, the present invention may record the computer program on a computer-readable non-temporary recording medium such as an HDD, a CD-ROM, or a semiconductor memory.
Further, the above-described embodiment and the above-mentioned modification may be combined.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10 Control unit 11 Current measurement unit 12 Cell voltage measurement unit 14 Total voltage acquisition unit 15 Internal resistance calculation unit 16 Communication unit 17 Wiring resistance calculation unit 18 Abnormality detection unit 19 Storage unit 20 Timer 50 Secondary battery unit 50a Cell voltage detection line 50b Total voltage detection line 50c Current detection line 51 Cell 52 Current sensor 61-63 Relay 71 Generator 72 Starter motor 73 Battery 74, 75 Electric load 100 Battery monitoring device

Claims (17)

It is an internal resistance calculation device that calculates the internal resistance of a secondary battery to which multiple cells are connected.
A current measuring unit that measures the current of the secondary battery,
A cell voltage measuring unit that measures the voltage of each cell,
The total voltage is acquired by measuring the total voltage of the secondary battery at a plurality of timings and calculating the total voltage at the current measurement timing based on the total voltage measured at the plurality of timings. Total voltage acquisition unit and
An internal unit including an internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing. Resistance calculation device. Moreover,
Equipped with an engine information acquisition unit that acquires information on engine startup timing
The internal resistance calculation unit has the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to the engine start timing acquired by the engine information acquisition unit as the predetermined timing. The internal resistance calculation device according to claim 1, wherein the internal resistance is calculated based on the above. The internal resistance calculation device according to claim 1, wherein the total voltage acquisition unit calculates the total voltage at the measurement timing of the current based on the total voltage measured at a plurality of timings in the cycle in which the current is measured. .. The total voltage acquisition unit sets the current measurement timing based on the total voltage measured in a cycle before the current measurement cycle and the total voltage measured within the current measurement cycle. The internal resistance calculation device according to claim 1, which calculates the total voltage. It is an internal resistance calculation device that calculates the internal resistance of a secondary battery to which multiple cells are connected.
A cell voltage measuring unit that measures the voltage of each cell,
A total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and
A current measuring unit that measures the current of the secondary battery at a plurality of timings and calculates the current at the timing of measuring the total voltage by the total voltage acquisition unit based on the currents measured at the plurality of timings.
The internal resistance of the secondary battery is calculated based on the current at the measurement timing of the total voltage calculated by the current measuring unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing . An internal resistance calculation device equipped with a resistance calculation unit. The fifth aspect of claim 5 in which the current measuring unit calculates the current at the measurement timing of the total voltage based on the current measured at a plurality of timings within the cycle in which the total voltage acquisition unit measures the total voltage. Internal resistance calculation device. The current measuring unit is based on the current measured in a cycle before the cycle in which the total voltage acquisition unit measures the total voltage and the current measured in the cycle in which the total voltage is measured. The internal resistance calculation device according to claim 5, wherein the current is calculated at the measurement timing of the total voltage. It is an internal resistance calculation device that calculates the internal resistance of a secondary battery to which multiple cells are connected.
A current measuring unit that measures the current of the secondary battery,
A cell voltage measuring unit that measures the voltage of each cell,
A total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and
An internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing.
Based on the voltage of each cell measured by the cell voltage measuring unit and the total voltage acquired by the total voltage acquisition unit, the wiring resistance generated in the total voltage acquisition path by the total voltage acquisition unit is calculated. Wiring resistance calculation unit and
An internal resistance calculation device including an abnormality detection unit that detects an abnormality occurring in a wiring path for measuring the total voltage by the total voltage acquisition unit based on the wiring resistance calculated by the wiring resistance calculation unit. It is an internal resistance calculation device that calculates the internal resistance of a secondary battery to which multiple cells are connected.
A current measuring unit that measures the current of the secondary battery,
A cell voltage measuring unit that measures the voltage of each cell,
A total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and
An internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing.
Based on the voltage of each cell measured by the cell voltage measuring unit and the total voltage acquired by the total voltage acquisition unit, the wiring resistance generated in the total voltage acquisition path by the total voltage acquisition unit is calculated. Equipped with a wiring resistance calculation unit
The total voltage acquisition unit is an internal resistance calculation device that corrects the total voltage based on the wiring resistance calculated by the wiring resistance calculation unit. It is an internal resistance calculation method that calculates the internal resistance of a secondary battery to which multiple cells are connected.
The step of measuring the current of the secondary battery and
Steps to measure the voltage of each cell and
The total voltage is acquired by measuring the total voltage of the secondary battery at a plurality of timings and calculating the total voltage at the current measurement timing based on the total voltage measured at the plurality of timings. Steps and
An internal resistance calculation method including a step of calculating the internal resistance of the secondary battery based on the measured current and the acquired total voltage according to a predetermined timing. It is an internal resistance calculation method that calculates the internal resistance of a secondary battery to which multiple cells are connected.
Steps to measure the voltage of each cell and
The step of acquiring the total voltage by measuring the total voltage of the secondary battery, and
A step of measuring the current of the secondary battery at a plurality of timings and calculating the current at the measurement timing of the total voltage based on the currents measured at the plurality of timings.
An internal resistance calculation method including a step of calculating the internal resistance of the secondary battery based on the current at the measurement timing of the total voltage calculated according to a predetermined timing and the acquired total voltage. It is an internal resistance calculation method that calculates the internal resistance of a secondary battery to which multiple cells are connected.
The step of measuring the current of the secondary battery and
Steps to measure the voltage of each cell and
The step of acquiring the total voltage by measuring the total voltage of the secondary battery, and
A step of calculating the internal resistance of the secondary battery based on the measured current and the acquired total voltage according to a predetermined timing.
A step of calculating the wiring resistance generated in the acquisition path of the total voltage based on the measured voltage of each cell and the acquired total voltage.
An internal resistance calculation method including a step of detecting an abnormality occurring in a wiring path for measuring the total voltage based on the calculated wiring resistance. It is an internal resistance calculation method that calculates the internal resistance of a secondary battery to which multiple cells are connected.
The step of measuring the current of the secondary battery and
Steps to measure the voltage of each cell and
The step of acquiring the total voltage by measuring the total voltage of the secondary battery, and
A step of calculating the internal resistance of the secondary battery based on the measured current and the acquired total voltage according to a predetermined timing.
Including a step of calculating the wiring resistance generated in the acquisition path of the total voltage based on the measured voltage of each cell and the acquired total voltage.
An internal resistance calculation method for correcting the total voltage based on the calculated wiring resistance in the step of acquiring the total voltage. It is an internal resistance calculation program for calculating the internal resistance of a secondary battery to which multiple cells are connected.
Computer,
A current measuring unit that measures the current of the secondary battery,
A cell voltage measuring unit that measures the voltage of each cell,
The total voltage is acquired by measuring the total voltage of the secondary battery at a plurality of timings and calculating the total voltage at the current measurement timing based on the total voltage measured at the plurality of timings. Total voltage acquisition unit and
It functions as an internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing. Internal resistance calculation program to make it. It is an internal resistance calculation program for calculating the internal resistance of a secondary battery to which multiple cells are connected.
Computer,
A cell voltage measuring unit that measures the voltage of each cell,
A total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and
A current measuring unit that measures the current of the secondary battery at a plurality of timings and calculates the current at the timing of measuring the total voltage by the total voltage acquisition unit based on the currents measured at the plurality of timings.
The internal resistance of the secondary battery is calculated based on the current at the measurement timing of the total voltage calculated by the current measuring unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing . An internal resistance calculation program for functioning as a resistance calculation unit. It is an internal resistance calculation program for calculating the internal resistance of a secondary battery to which multiple cells are connected.
Computer,
A current measuring unit that measures the current of the secondary battery,
A cell voltage measuring unit that measures the voltage of each cell,
A total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and
An internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing.
Based on the voltage of each cell measured by the cell voltage measuring unit and the total voltage acquired by the total voltage acquisition unit, the wiring resistance generated in the total voltage acquisition path by the total voltage acquisition unit is calculated. Wiring resistance calculation unit and
Based on the wiring resistance calculated by the wiring resistance calculation unit, the internal resistance calculation for functioning as an abnormality detection unit for detecting an abnormality occurring in the wiring path for measuring the total voltage by the total voltage acquisition unit. program. It is an internal resistance calculation program for calculating the internal resistance of a secondary battery to which multiple cells are connected.
Computer,
A current measuring unit that measures the current of the secondary battery,
A cell voltage measuring unit that measures the voltage of each cell,
A total voltage acquisition unit that acquires the total voltage by measuring the total voltage of the secondary battery, and
An internal resistance calculation unit that calculates the internal resistance of the secondary battery based on the current measured by the current measurement unit and the total voltage acquired by the total voltage acquisition unit according to a predetermined timing.
Based on the voltage of each cell measured by the cell voltage measuring unit and the total voltage acquired by the total voltage acquisition unit, the wiring resistance generated in the total voltage acquisition path by the total voltage acquisition unit is calculated. It functions as a wiring resistance calculation unit,
The total voltage acquisition unit is an internal resistance calculation program that corrects the total voltage based on the wiring resistance calculated by the wiring resistance calculation unit.

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