JP2015224884A - Multiple battery pack state monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee the reliability of control by a control device including an A/D converter with a simple configuration without using a sub control device not including an A/D converter.SOLUTION: A logic execution unit 19 in a first voltage monitoring IC 3 selects any one of reference voltage of an internal reference voltage source 13 in itself and reference voltage of an internal reference voltage source 13 input from a second voltage monitoring IC 5 by multiplexer circuits 9a, 9b. Then, it compares the selected reference voltage of the internal reference voltage source 13 with an ideal value of reference voltage from an external reference voltage source 15, and determines whether the reference voltage is appropriate or not. It notifies an upper-level computer of the determination result. The upper-level computer evaluates voltage monitoring of each of unit cells 1-10 performed by the logic execution units 19 in the first voltage monitoring IC 3 and the second voltage monitoring IC 5 as to whether it has reliability using a measurement value obtained by a reliable A/D converter 17 having performed A/D conversion.

Description

  The present invention relates to a system for monitoring a state of a plurality of assembled batteries that output a desired voltage by connecting a plurality of unit cells in series.

  For example, a hybrid vehicle includes a plurality of assembled batteries as a drive power source for a motor. The multiple assembled battery obtains a high voltage by connecting a plurality of unit cells of secondary batteries (storage battery) such as nickel / hydrogen batteries and lithium batteries in series.

  In such a plurality of battery packs, it is necessary to monitor the charge state of each unit cell so that each unit cell is not overdischarged or overcharged. Therefore, a control device is provided for each cell block composed of a plurality of continuous unit cells, and the measured values of the voltage and charge / discharge current of each unit cell in the cell block are monitored by the monitoring IC (integrated circuit) of each control device. Monitoring is done in

  In that case, each control device takes in the measured unit cell or cell block voltage by analog-to-digital conversion by an A / D converter built in the IC. Therefore, when the reference voltage supplied to the A / D converter is shifted, the digitally converted voltage value is shifted from the actual value, and charging / discharging control of the unit cell or cell block based on the measured voltage is not properly performed. there is a possibility.

  Therefore, there is also a configuration in which a sub control device that eliminates the need to incorporate an A / D converter in an IC by taking in a comparison result in a comparator of a measured voltage and an abnormal threshold is used together (for example, non- Patent Document 1). According to this, even if the reference voltage of the A / D converter is shifted in the IC of the control device and the unit cell or cell block is not appropriately charged / discharged by the control device, the unit cell or cell block is controlled by the sub control device. Can be backed up so that charge / discharge control is appropriately performed.

Nikkei Automotive Technology July 2012 p.100-101

  Since the above-described conventional technology is configured to ensure compensation when the reliability of control by the control device is reduced due to the shift of the reference voltage in the A / D converter by using the sub-control device together, It will increase in size.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to simplify the control reliability of a control device having an A / D converter without using a sub control device without an A / D converter. An object of the present invention is to provide a state monitoring system for a plurality of assembled batteries that can be secured by a configuration.

In order to achieve the above object, a state monitoring system for a plurality of assembled batteries according to claim 1 of the present invention comprises:
In a system for monitoring the state of a plurality of assembled batteries in which a plurality of unit cells are connected in series,
A unit cell of a corresponding cell block provided in a one-to-one correspondence with other cell blocks excluding one cell block among a plurality of cell blocks configured in the plurality of assembled batteries by a plurality of continuous unit cells. An A / D converter that A / D-converts the voltage of the A / D converter, an internal reference voltage source that supplies a reference voltage for A / D conversion to the A / D converter, and an output port that outputs the reference voltage Two cell block monitoring subunits,
An A / D converter provided corresponding to the one cell block, for A / D converting the voltage of the unit cell of the corresponding cell block, and an internal for supplying a reference voltage for A / D conversion to the A / D converter A reference voltage source; an external reference voltage source that generates an external reference voltage corresponding to an ideal value of the reference voltage; and at least one input port to which the reference voltage from the output port of the cell block monitoring subunit is input A selection unit that selects one of the reference voltage of the internal reference voltage source and the reference voltage input to the input port; a reference voltage selected by the selection unit; and the external reference voltage A cell block monitoring main unit having a determination unit that determines the suitability of the selected reference voltage by comparing the reference voltage, and a determination result output unit that outputs a determination result of the determination unit;
It is characterized by providing.

  According to the multi-battery battery state monitoring system of the first aspect of the present invention, the determination unit of the cell block monitoring main unit inputs the reference voltage of its own internal reference voltage source and the cell block monitoring subunit. One of the reference voltages of the internal reference voltage sources of the cell block monitoring subunit is selected by the selection unit. Then, the reference voltage selected by the selection unit is compared with the external reference voltage of the external reference voltage source, and the suitability of the reference voltage is determined.

  That is, the suitability of the reference voltage of the internal reference voltage source of the cell block monitoring sub-unit or the cell block monitoring main unit is determined by comparison with the common target of the external reference voltage source of the external reference voltage source of the cell block monitoring main unit. The determination result is output.

  Therefore, at the output destination of the determination result that receives the suitability of the reference voltage of the internal reference voltage source of the cell block monitor subunit or the cell block monitor main unit, each monitor unit (cell block monitor sub-unit) is based on the suitability of the received reference voltage. The monitoring contents of the voltage of the unit cell by the unit or the cell block monitoring main unit) can be evaluated.

  Therefore, when the reference voltage of the A / D converter is shifted in a monitoring unit (cell block monitoring subunit or cell block monitoring main unit) having an A / D converter that monitors the voltage of each unit cell of the plurality of assembled batteries. In addition, the reliability of monitoring control by the monitoring unit (cell block monitoring subunit or cell block monitoring main unit) can be ensured with a simple configuration without using a monitoring unit that does not have an A / D converter.

Moreover, in order to achieve the said objective, the multiple battery monitoring state system of this invention described in Claim 2 is the following.
In a system for monitoring the state of a plurality of assembled batteries in which a plurality of unit cells are connected in series,
A unit cell of a corresponding cell block provided in a one-to-one correspondence with other cell blocks excluding one cell block among a plurality of cell blocks configured in the plurality of assembled batteries by a plurality of continuous unit cells. An A / D converter for A / D converting the voltage of the A, a reference voltage source for supplying an A / D conversion reference voltage to the A / D converter, and a potential of a specific unit cell of the corresponding cell block as A At least one cell block monitoring subunit having an output port for outputting an A / D conversion result obtained by A / D conversion by the / D converter;
An A / D converter provided corresponding to the one cell block, for A / D converting the voltage of the unit cell of the corresponding cell block, and an internal for supplying a reference voltage for A / D conversion to the A / D converter A reference voltage source, at least one input port to which the A / D conversion result from the output port of the cell block monitoring subunit is input, the A / D conversion result to be input to the input port, and the A A determination unit that determines the difference between the A / D conversion result obtained by performing A / D conversion on the potential of the specific cell of the other cell block corresponding to the / D conversion result by the A / D converter; A cell block monitoring main unit having a determination result output unit for outputting a determination result of the unit;
It is characterized by providing.

  According to the state monitoring system for a plurality of assembled batteries of the present invention described in claim 2, the potential of a specific unit cell in the cell block corresponding to the cell block monitoring subunit is converted into an A / D converter of the cell block monitoring subunit. And A / D conversion by the A / D converter of the cell block monitoring main unit. And the difference of the A / D conversion result of each A / D converter is determined in the determination part of a cell block monitoring main unit.

  That is, the A / D conversion result of the potential of a specific unit cell that has been A / D converted by the A / D converter of the cell block monitoring subunit is the A / D converted A / D converted potential of the same unit cell. Based on the A / D conversion result by the / D converter, evaluation is performed based on a determination result as to whether or not the past is the same, and the determination result is output.

  Therefore, the difference in the received A / D conversion result at the output destination of the determination result for receiving the difference in the A / D conversion result of the potential of the same unit cell by the A / D converter of the cell block monitoring subunit or the cell block monitoring main unit. Based on the above, the monitoring contents of the voltage of the unit cell by each monitoring unit (cell block monitoring subunit or cell block monitoring main unit) can be evaluated.

  Therefore, when the reference voltage of the A / D converter is shifted in a monitoring unit (cell block monitoring subunit or cell block monitoring main unit) having an A / D converter that monitors the voltage of each unit cell of the plurality of assembled batteries. In addition, the reliability of monitoring control by the monitoring unit (cell block monitoring subunit or cell block monitoring main unit) can be ensured with a simple configuration without using a monitoring unit that does not have an A / D converter.

  According to the multi-battery battery state monitoring system of the present invention, the control reliability of the control device having the A / D converter is ensured with a simple configuration without using the sub control device having no A / D converter. be able to.

It is a circuit diagram which shows schematic structure of 1st voltage monitoring IC of the condition monitoring system of the assembled battery which concerns on one Embodiment of this invention. It is a circuit diagram which shows schematic structure of 2nd voltage monitoring IC of the condition monitoring system of the assembled battery which concerns on one Embodiment of this invention. It is a circuit diagram which shows schematic structure of 1st voltage monitoring IC of the condition monitoring system of the assembled battery which concerns on other embodiment of this invention. It is a circuit diagram which shows schematic structure of 2nd voltage monitoring IC of the multiple battery monitoring state system which concerns on other embodiment of this invention.

  Embodiments of a state monitoring system for a plurality of assembled batteries according to the present invention will be described below with reference to the drawings.

  1 and 2 are circuit diagrams illustrating a schematic configuration of a state monitoring system for a plurality of assembled batteries according to an embodiment of the present invention. The state monitoring system for a plurality of assembled batteries of the present embodiment (hereinafter abbreviated as “state monitoring system”) manages the voltage of a secondary battery in which a plurality of unit cells such as lithium ion batteries are connected in series. In the present embodiment, a secondary battery is configured by connecting ten unit cells in series.

  The state monitoring system according to the present embodiment includes a first voltage monitoring IC 3 shown in FIG. 1 (corresponding to the cell block monitoring main unit in the claims) and a second voltage monitoring IC 5 shown in FIG. 2 (in the claims). Equivalent to a cell block monitoring subunit).

  The first voltage monitoring IC 3 in FIG. 1 includes five unit cells CELL1 to CELL5 divided as a first block (corresponding to one cell block in the claims) among ten unit cells of the secondary battery. Measure and monitor the output voltage. The second voltage monitoring IC 5 in FIG. 2 measures and monitors the output voltages of the five unit cells CELL6 to CELL10 divided as the second block (corresponding to other cell blocks in the claims).

  A secondary battery composed of 10 unit cells CELL1 to 10 whose output voltages are measured and monitored by the first voltage monitoring IC 3 and the second voltage monitoring IC 5 corresponds to the plurality of assembled batteries in the claims. doing.

  As shown in FIG. 1, the first voltage monitoring IC 3 includes six input ports VIN0 to VIN5 connected to both ends of the unit cells CELL1 to CELL5 and connection points, and a unit cell CELL1 having the lowest potential in the first block. And a reference port VREF0 connected to the ground port VSS via the capacitor C1.

  The first voltage monitoring IC 3 includes a power supply port VCC to which the positive electrode of the unit cell CELL5 having the highest potential in the first block is connected, three spare input ports VINH, VINL, VINR, and an auxiliary reference port EXREF. Have.

  Note that a low-pass filter unit 7a is provided between one spare input port VINL, input ports VIN1 to VIN5 other than the input port VIN0, and their connection targets. The low-pass filter unit 7a performs filtering with predetermined characteristics based on the potential of the ground port VSS generated by the first voltage monitoring IC 3 from the voltage of the power supply port VCC supplied to the first voltage monitoring IC 3.

  Further, the first voltage monitoring IC 3 selectively turns on the switches SH1 to SH5 and SHH, thereby connecting the five input ports VIN1 to VIN1 connected to the positive electrodes of the unit cells CELL1 to CELL5 through the low pass filter unit 7a. A multiplexer circuit 9a (corresponding to a selection unit in the claims) for selecting one port from the VIN5 and the spare input port VINH is provided.

  In addition, the first voltage monitoring IC 3 selectively turns on the switches SL0 to SL4 and SLL, so that the five input ports VIN0 to VIN0 connected to the negative electrodes of the unit cells CELL1 to CELL5 via the low pass filter unit 7a, respectively. It has a multiplexer circuit 9b (corresponding to a selection unit in claims) for selecting one port from among VIN4 and spare input port VINL.

  For example, when measuring the voltage of the unit cell CELL1, the switch SH1 of the multiplexer circuit 9a and the switch SL0 of the multiplexer circuit 9b corresponding to the input ports VIN1 and VIN0 to which the positive electrode and the negative electrode of the unit cell CELL1 are connected, respectively. Turned on. For example, when measuring the voltage of the unit cell CELL5, the switch SH5 of the multiplexer circuit 9a and the switch SL4 of the multiplexer circuit 9b corresponding to the input ports VIN5 and VIN4 to which the positive electrode and the negative electrode of the unit cell CELL5 are connected, respectively. Turned on.

  Further, the first voltage monitoring IC 3 includes a differential amplifier circuit 11 that differentially amplifies the outputs of the multiplexer circuits 9a and 9b. The differential amplifier circuit 11 includes two operational amplifiers 11a and 11b and a differential amplifier 11c.

  One operational amplifier 11a includes the output of the multiplexer circuit 9a, the output of the internal reference voltage source 13 connected to the switch SHR1, and the output of the external reference voltage source 15 connected to the switch SHR2 via the spare input port VINR. One of them is selected and amplified. The other operational amplifier 11b selects and amplifies the output of the multiplexer circuit 9b.

  The internal reference voltage source 13 is connected to the differential amplifier circuit 11 through resistors R1 and R2 constituting a low-pass filter 7b together with a capacitor C1 connected to the reference port VREF0. The external reference voltage source 15 is also connected to the differential amplifier circuit 11 through a low-pass filter 7c composed of its own internal resistance and capacitor C2.

  The differential amplifier 11c differentially amplifies the outputs of both operational amplifiers 11a and 11b. The output of the differential amplifier 11c is A / D converted by the A / D converter 17 and input to the logic execution unit 19 constituted by the CPU.

  The internal reference voltage source 13 supplies a reference voltage for A / D conversion to the A / D converter 17, and the external reference voltage source 15 generates a constant value for generating an ideal value of the reference voltage supplied from the internal reference voltage source 13. It is a voltage circuit. The external reference voltage source 15 receives an enable signal via the auxiliary reference port EXREF while the switch SER of the first voltage monitoring IC 3 is on. The external reference voltage source 15 to which the enable signal is input generates a voltage having an ideal value of the reference voltage of the internal reference voltage source 13 and applies it to the spare input port VINR.

  The logic execution unit 19 (corresponding to the determination unit in the claims) monitors the voltages of the unit cells CELL1 to CELL5 of the first block based on the input from the A / D converter 17. Further, as necessary, data is communicated between the daisy chain-connected host computer (not shown) and the second voltage monitoring IC 5 via the communication modules 21 and 23 (corresponding to the determination result output unit in the claims). Communicate.

  As shown in FIG. 2, the second voltage monitoring IC 5 is similar to the first voltage monitoring IC 3 in that the six input ports VIN0 to VIN5, the ground port VSS and the reference port VREF0, the power supply port VCC, and three It has spare input ports VINH, VINL, VINR and an auxiliary reference port EXREF.

  The positive electrodes of the unit cells CELL6 to CELL10 are connected to the five input ports VIN1 to VIN5 through the low-pass filter unit 7a, respectively. The negative electrodes of the unit cells CELL6 to CELL10 are connected to the five input ports VIN0 to VIN4 via the low-pass filter unit 7a. The low-pass filter unit 7a uses the potential of the ground port VSS generated by the second voltage monitoring IC 5 from the voltage of the power supply port VCC supplied to the second voltage monitoring IC 5 as a reference, and the low-pass filter 7a of the first voltage monitoring IC 3 Filtering with the same characteristics as (see FIG. 1) is performed.

  The negative electrode of the unit cell CELL6 having the lowest potential in the second block is connected to the ground port VSS. The reference port VREF0 is connected to the spare input ports VINH and VINL of the first voltage monitoring IC 3 via the low-pass filter portion 7a of the first voltage monitoring IC 3.

  Therefore, in the present embodiment, the spare input ports VINH and VINL of the first voltage monitoring IC 3 correspond to the input ports in the claims, and the reference port VREF0 of the second voltage monitoring IC 5 is the output port in the claims. It corresponds.

  A positive electrode of the unit cell CELL10 having the highest potential in the second block is connected to the power supply port VCC. The three spare input ports VINH, VINL and VINR are open. The auxiliary reference port EXREF is connected to the ground port VSS via a balancing resistor R3 having the same resistance value as the internal impedance of the external reference voltage source 15 of the first voltage monitoring IC3.

  Further, the second voltage monitoring IC 5 is similar to the first voltage monitoring IC 3 in that the low-pass filter unit 7a, the multiplexer circuits 9a and 9b, the differential amplifier circuit 11, the internal reference voltage source 13, the A / D converter 17, and the logic The execution unit 19 includes communication modules 21 and 23, switches SHR1 and SHR2, and a switch SER. The second voltage monitoring IC 5 does not have the external reference voltage source 15.

  Based on the input from the A / D converter 17, the logic execution unit 19 monitors the voltages of the unit cells CELL6 to CELL10 of the second block. If necessary, data communication is performed with a host computer (not shown) and the first voltage monitoring IC 3 connected in a daisy chain via the communication modules 21 and 23.

  Next, in the state monitoring system configured as described above, the reference voltage of the internal reference voltage source 13 of each of the voltage monitoring ICs 3 and 5 performed in cooperation with the first voltage monitoring IC 3 and the second voltage monitoring IC 5. The evaluation process will be described.

  First, the reference voltage of the internal reference voltage source 13 is measured in order to evaluate the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3. For this purpose, in the first voltage monitoring IC 3, the switch SH 1 is turned on, and the reference voltage of the internal reference voltage source 13 is input to the operational amplifier 11 a of the differential amplifier circuit 11. At the same time, in the first voltage monitoring IC 3, the switch SL0 is turned on, and the ground potential GND of the ground port VSS is input to the operational amplifier 11b of the differential amplifier circuit 11 via the input port VIN0.

  Thus, in the first voltage monitoring IC 3, the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3 is A / D converted by the A / D converter 17 after gain adjustment, and the reference voltage digital A value is input to the logic execution unit 19.

  Next, in the first voltage monitoring IC 3, an ideal value of the reference voltage of the internal reference voltage source 13 is taken in. Therefore, in the first voltage monitoring IC 3, the switch SER is turned on and the external reference voltage source 15 is enabled. In this state, the switch SH2 is turned on instead of the switch SH1, and the ideal voltage of the reference voltage of the internal reference voltage source 13 is input from the external reference voltage source 15 to the operational amplifier 11a of the differential amplifier circuit 11. At the same time, in the first voltage monitoring IC 3, the switch SL0 is turned on, and the ground potential GND of the ground port VSS is input to the operational amplifier 11b of the differential amplifier circuit 11 via the input port VIN0.

  Thereby, in the first voltage monitoring IC 3, the ideal value of the reference voltage of the internal reference voltage source 13 from the external reference voltage source 15 is A / D converted by the A / D converter 17 after gain adjustment. Then, the digital value of the ideal value of the reference voltage is input to the logic execution unit 19.

  The logic execution unit 19 of the first voltage monitoring IC 3 compares the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3 that is successively input with each digital value of the ideal value. The logic execution unit 19 then determines the A / D of the first voltage monitoring IC 3 depending on whether the difference between the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3 and its ideal value is within an allowable range. It is determined whether the A / D conversion result by the converter 17 is reliable (corresponding to the suitability of the reference voltage in the claims).

  Note that the measurement of the reference voltage of the internal reference voltage source 13 and the capture of the ideal value cannot be performed simultaneously. Therefore, the measurement of the reference voltage of the internal reference voltage source 13 and the capture of the ideal value may be performed a plurality of times, and the above determination may be performed using the respective average values.

  Further, in the first voltage monitoring IC 3, while the switch SER is turned on in order to capture the ideal value of the reference voltage of the internal reference voltage source 13 from the external reference voltage source 15, the second voltage monitoring IC 5 Also turns on the switch SER. As a result, the same power as the power consumption of the unit cells CELL1 to CELL5 of the first block by the external reference voltage source 15 of the first voltage monitoring IC 3 is supplied to the second voltage monitoring IC 5 by the balancing resistor R. It is consumed in the unit cells CELL6 to CELL10 of the block. By doing in this way, it can prevent that the charge state of unit cell CELL1-CELL10 varies between blocks.

  Next, in order to evaluate the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5, the first voltage monitoring IC 3 measures the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5. . Therefore, in the first voltage monitoring IC 3, the switches SHH, SHL, SH1, and SH2 are turned on, and the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5 is changed from the reference port VREF0 to the low-pass filter unit 7a and The signals are input to the operational amplifiers 11a and 11b of the differential amplifier circuit 11 via the spare input ports VINH and VINL.

  Thereby, in the first voltage monitoring IC 3, the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5 is A / D converted by the A / D converter after gain adjustment, and the digital value of the reference voltage is obtained. Is input to the logic execution unit 19.

  The logic execution unit 19 of the first voltage monitoring IC 3 includes the input digital value of the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5 and the external reference voltage source 15 of the first voltage monitoring IC 3. The digital value of the ideal value of the reference voltage input to is compared. Then, the logic execution unit 19 determines whether the A / D of the second voltage monitoring IC 5 depends on whether the difference between the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5 and its ideal value is within an allowable range. It is determined whether the A / D conversion result by the converter 17 is reliable (corresponding to the suitability of the reference voltage in the claims).

  When there are further unit cell blocks constituting the secondary battery, the voltage monitoring IC (cells in the claims) configured in the same manner as the second voltage monitoring IC 5 corresponding to each of the existing blocks. Equivalent to block monitoring subunit). Then, the reference voltage is taken into the first voltage monitoring IC 3 from each voltage monitoring IC, and the digital value and the ideal digital value of the reference voltage from the external reference voltage source 15 of the first voltage monitoring IC 3 are The logic execution unit 19 of the first voltage monitoring IC 3 performs comparison.

  As a result of comparison, a reference voltage whose difference from an ideal digital value of the reference voltage input from the external reference voltage source 15 is not within an allowable range is generated in the first voltage monitoring IC 3 or the second voltage monitoring IC 5. When the voltage is output from the reference voltage source 13, the logic execution unit 19 of the first voltage monitoring IC 3 notifies, for example, a difference from the ideal value to an upper computer (not shown) by data communication.

  In particular, when the reference voltage is shifted higher than the ideal value, the voltages of the unit cells CELL1 to CELL10 are measured to be lower than actual, and the unit cells CELL1 to CELL10 may be overcharged. Therefore, by receiving a notification from the first voltage monitoring IC 3 regarding the difference in the reference voltage whose difference from the ideal value as described above exceeds the allowable range, the host computer can detect the internal reference voltage source 13 in which the reference voltage is shifted. It is possible to instruct the first voltage monitoring IC 3 and the second voltage monitoring IC 5 having the control to prevent the occurrence of overcharge.

  Thus, according to the state monitoring system of this embodiment, the logic execution unit 19 of the first voltage monitoring IC 3 receives the reference voltage of its own internal reference voltage source 13 and the second voltage monitoring IC 5. One of the reference voltage of the internal reference voltage source 13 is selected by the multiplexer circuits 9a and 9b. Then, the reference voltage of the selected internal reference voltage source 13 is compared with the ideal value of the reference voltage from the external reference voltage source 15, and the suitability of the reference voltage is determined.

  That is, whether or not the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3 or the second voltage monitoring IC 5 is appropriate is referred to as an ideal value of the reference voltage from the external reference voltage source 15 of the first voltage monitoring IC 3. Each was judged by comparison with the subject.

  Therefore, in the upper computer to which the determination result is notified, the voltage monitoring of each of the unit cells CELL1 to CELL10 performed by the logic execution unit 19 of the first voltage monitoring IC 3 or the second voltage monitoring IC 5 is reliable. It is possible to evaluate whether or not there is reliability using a measurement value A / D converted by the high A / D converter 17.

  Therefore, in the first voltage monitoring IC 3 and the second voltage monitoring IC 5, when the reference voltage output from the internal reference voltage source 13 is shifted, it is simple without using a monitoring unit having no A / D converter. With the configuration, the reliability of voltage monitoring control of the unit cells CELL1 to CELL10 of the secondary battery by the first voltage monitoring IC 3 and the second voltage monitoring IC 5 can be ensured.

  In the above-described embodiment, the suitability of the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3 or the second voltage monitoring IC 5 is determined based on the reference voltage from the external reference voltage source 15 of the first voltage monitoring IC 3. It was set as the structure judged by comparison with the ideal value. However, the configuration may be such that the suitability of each reference voltage is determined by comparing the reference voltage of the internal reference voltage source 13 of the first voltage monitoring IC 3 with the reference voltage of the internal reference voltage source 13 of the second voltage monitoring IC 5. .

  Hereinafter, another embodiment of the present invention having such a configuration will be described. 3 and 4 are circuit diagrams showing a schematic configuration of a state monitoring system according to another embodiment of the present invention.

  In the state monitoring system of the present embodiment, as shown in FIG. 3, in the first voltage monitoring IC 3, the ideal value of the reference voltage from the external reference voltage source 15 in the first voltage monitoring IC 3 shown in FIG. The configuration for A / D converting the reference voltage of the internal reference voltage source 13 by the A / D converter 17 is omitted.

  Further, in the state monitoring system of the present embodiment, as shown in FIG. 4, in the second voltage monitoring IC 5, the reference voltage of its own internal reference voltage source 13 in the second voltage monitoring IC 5 shown in FIG. The configuration for A / D conversion by the / D converter 17 and the configuration for A / D conversion of the reference voltage of its own internal reference voltage source 13 by the A / D converter 17 of the first voltage monitoring IC 3 are omitted. ing.

  In the state monitoring system of the present embodiment, the first voltage monitoring IC 3 and the second voltage monitoring IC 5 are provided in the first voltage monitoring IC 3 shown in FIG. 1 and the second voltage monitoring IC 5 shown in FIG. Instead of the three spare input ports VINH, VINL, VINR and the switches SHH, SHL, SER, an input port VIN6 and a switch SH6 are added as shown in FIGS.

  As shown in FIG. 4, the input port VIN6 of the first voltage monitoring IC 3 shown in FIG. 3 passes through a low-pass filter including a resistor R6 and a capacitor C6 provided in the low-pass filter unit 7a of the first voltage monitoring IC 3. And connected to the positive electrode of the unit cell CELL6 of the second block of the secondary battery. The low pass filter by the resistor R6 and the capacitor C6 is the ground port VSS generated by the first voltage monitoring IC 3 from the voltage of the power supply port VCC supplied to the first voltage monitoring IC 3 in the same manner as the other low pass filters of the low pass filter unit 7a. Filtering of a predetermined characteristic is performed with reference to the potential. The capacitor C6 is connected to the ground port VSS of the first voltage monitoring IC 3 as shown in FIG.

  Next, in the state monitoring system configured as described above, the reference voltage of the internal reference voltage source 13 of each of the voltage monitoring ICs 3 and 5 performed in cooperation with the first voltage monitoring IC 3 and the second voltage monitoring IC 5. The evaluation process will be described.

  In the present embodiment, the voltage of the unit cell CELL6 of the second block of the secondary battery is simultaneously measured by the first voltage monitoring IC 3 and the second voltage monitoring IC 5 respectively.

  For this purpose, in the first voltage monitoring IC3, the switches SH6 and SL5 are turned on, and the voltage of the unit cell CELL6 is A / D converted by the A / D converter 17 of the first voltage monitoring IC3. The voltage of the unit cell CELL6 A / D converted by the A / D converter 17 is filtered based on the potential of the ground port VSS of the first voltage monitoring IC 3 of the low pass filter by the resistor R6 and the capacitor C6 of the low pass filter unit 7a. And after gain adjustment by the differential amplifier circuit 11. The digital value of the voltage of the unit cell CELL6 A / D converted by the A / D converter 17 is input to the logic execution unit 19 of the first voltage monitoring IC3.

  At the same time, in the second voltage monitoring IC 5, the switches SH 1 and SL 0 are turned on, and the voltage of the unit cell CELL 6 is A / D converted by the A / D converter 17 of the second voltage monitoring IC 5. The voltage of the unit cell CELL6 A / D converted by the A / D converter 17 is filtered based on the potential of the ground port VSS of the second voltage monitoring IC 5 by the low pass filter corresponding to the unit cell CELL6 of the low pass filter unit 7a. And after gain adjustment by the differential amplifier circuit 11. The digital value of the voltage of the unit cell CELL6 after A / D conversion is input to the logic execution unit 19 of the second voltage monitoring IC5.

  The low-pass filter by the resistor R6 and the capacitor C6 of the low-pass filter unit 7a of the first voltage monitoring IC 3 has the same time constant as the low-pass filter corresponding to the unit cell CELL6 of the low-pass filter unit 7a of the second voltage monitoring IC 5. doing. Therefore, the A / D converters 17 of the first voltage monitoring IC 3 and the second voltage monitoring IC 5 A / D convert the voltage of the unit cell CELL 6 in the same phase.

  The logic execution unit 19 of the second voltage monitoring IC 5 converts the digital value of the voltage of the unit cell CELL 6 input from the A / D converter 17 into the communication modules 21 and 23 of the second voltage monitoring IC 5 (conversion in claims) The logic execution of the first voltage monitoring IC 3 via the communication modules 21 and 23 of the first voltage monitoring IC 3 (corresponding to the conversion result input unit in the claims) by data communication via the result output unit) Transfer to unit 19.

  The logic execution unit 19 (corresponding to the determination unit in the claims) of the first voltage monitoring IC 3 receives the digital value of the voltage of the unit cell CELL 6 input from the A / D converter 17 and the logic of the second voltage monitoring IC 5. The digital value of the voltage of the unit cell CELL6 A / D converted by the A / D converter 17 of the second voltage monitoring IC 5 transferred from the execution unit 19 is compared.

  The logic execution unit 19 determines whether the A / D conversion result by the A / D converter 17 of the first voltage monitoring IC 3 or the second voltage monitoring IC 5 is reliable (corresponding to the suitability of the reference voltage in the claims). ).

  This determination is based on the voltage of the unit cell CELL6 A / D converted by the A / D converter 17 of the first voltage monitoring IC 3 and the unit A / D converted by the A / D converter 17 of the second voltage monitoring IC 5. Whether the voltage of the cell CELL6 matches or not is checked by checking whether the difference is within the allowable range.

  When there are further unit cell blocks constituting the secondary battery, the voltage monitoring IC (cells in the claims) configured in the same manner as the second voltage monitoring IC 5 corresponding to each of the existing blocks. Equivalent to block monitoring subunit). Then, the digital value of the voltage of the unit cell CELL6 transferred from each voltage monitoring IC and A / D converted by the A / D converter 17 of the voltage monitoring IC, and the A / D of the first voltage monitoring IC3. The digital value of the voltage of the unit cell CELL 6 A / D converted by the converter 17 is compared in the logic execution unit 19 of the first voltage monitoring IC 3.

  Even in the state monitoring system of this embodiment configured as described above, as a result of comparison in the logic execution unit 19 of the first voltage monitoring IC 3, a unit that is A / D converted by the A / D converter 17 of each of the voltage monitoring ICs 3 and 5. When the voltage of the cell CELL6 does not match or the difference between the two voltages does not fall within the allowable range, the logic execution unit 19 of the first voltage monitoring IC 3 performs data communication with an upper computer (not shown) or the like. Notify by. As a result, it is possible to instruct control from the upper computer to prevent the occurrence of overcharging to the first voltage monitoring IC 3 and the second voltage monitoring IC 5.

  That is, even in the state monitoring system of this embodiment, in the host computer, the voltage monitoring of the unit cells CELL1 to CELL10 performed by the logic execution unit 19 of the first voltage monitoring IC 3 and the second voltage monitoring IC 5 is reliable. It is possible to evaluate whether or not there is a reliability using a measurement value obtained by performing A / D conversion with the highly reliable A / D converter 17.

  Therefore, in the first voltage monitoring IC 3 and the second voltage monitoring IC 5, when the reference voltage output from the internal reference voltage source 13 is shifted, it is simple without using a monitoring unit having no A / D converter. With the configuration, the reliability of voltage monitoring control of the unit cells CELL1 to CELL10 of the secondary battery by the first voltage monitoring IC 3 and the second voltage monitoring IC 5 can be ensured.

  The present invention is extremely useful when used in a system for monitoring the state of a plurality of assembled batteries in which a plurality of unit cells are connected in series.

3 First voltage monitoring IC (cell block monitoring main unit)
5 Second voltage monitoring IC (cell block monitoring subunit)
7a Low-pass filter unit 7b, 7c Low-pass filter 9a, 9b Multiplexer circuit (selection unit)
DESCRIPTION OF SYMBOLS 11 Differential amplifier circuit 11a, 11b Operational amplifier 11c Differential amplifier 13 Internal reference voltage source 15 External reference voltage source 17 A / D converter 19 Logic execution part (determination part)
21, 23 Communication module (judgment result output unit, conversion result output unit)
C1, C2, C6 Capacitor CELL1 to CELL10 Unit cell EXREF Auxiliary reference port R1, R2, R6 Resistor R3 Balancing resistor SER, SH1 to SH6, SL0 to SL5, SHH, SHR1, SHR2, SLL switch VCC power supply port VIN0 to VIN6 Input port VINH, VINL Spare input port (input port)
VINR Spare input port VREF0 Reference port (output port)
VSS Ground port

Claims (2)

In a system for monitoring the state of a plurality of assembled batteries in which a plurality of unit cells are connected in series,
A unit cell of a corresponding cell block provided in a one-to-one correspondence with other cell blocks excluding one cell block among a plurality of cell blocks configured in the plurality of assembled batteries by a plurality of continuous unit cells. An A / D converter that A / D-converts the voltage of the A / D converter, an internal reference voltage source that supplies a reference voltage for A / D conversion to the A / D converter, and an output port that outputs the reference voltage Two cell block monitoring subunits,
An A / D converter provided corresponding to the one cell block, for A / D converting the voltage of the unit cell of the corresponding cell block, and an internal for supplying a reference voltage for A / D conversion to the A / D converter A reference voltage source; an external reference voltage source that generates an external reference voltage corresponding to an ideal value of the reference voltage; and at least one input port to which the reference voltage from the output port of the cell block monitoring subunit is input A selection unit that selects one of the reference voltage of the internal reference voltage source and the reference voltage input to the input port; a reference voltage selected by the selection unit; and the external reference voltage A cell block monitoring main unit having a determination unit that determines the suitability of the selected reference voltage by comparing the reference voltage, and a determination result output unit that outputs a determination result of the determination unit;
A state monitoring system for a plurality of assembled batteries, comprising: In a system for monitoring the state of a plurality of assembled batteries in which a plurality of unit cells are connected in series,
A unit cell of a corresponding cell block provided in a one-to-one correspondence with other cell blocks excluding one cell block among a plurality of cell blocks configured in the plurality of assembled batteries by a plurality of continuous unit cells. An A / D converter for A / D converting the voltage of the A, a reference voltage source for supplying an A / D conversion reference voltage to the A / D converter, and a potential of a specific unit cell of the corresponding cell block as A A conversion result output unit for outputting an A / D conversion result obtained by A / D conversion by the / D converter, and at least one cell block monitoring subunit;
An A / D converter provided corresponding to the one cell block, for A / D converting the voltage of the unit cell of the corresponding cell block, and an internal for supplying a reference voltage for A / D conversion to the A / D converter A reference voltage source; at least one conversion result input unit to which the A / D conversion result from the conversion result output unit of the cell block monitoring subunit is input; and the A / D input to the conversion result input unit The difference between the D conversion result and the A / D conversion result obtained by A / D converting the potential of the specific cell of the other cell block corresponding to the A / D conversion result by the A / D converter of itself is determined. A cell block monitoring main unit having a determination unit and a determination result output unit for outputting a determination result of the determination unit;
A state monitoring system for a plurality of assembled batteries, comprising:

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