WO2014200033A1 - 電池監視システム、半導体回路、断線検出プログラム、及び断線検出方法 - Google Patents

電池監視システム、半導体回路、断線検出プログラム、及び断線検出方法 Download PDF

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Publication number
WO2014200033A1
WO2014200033A1 PCT/JP2014/065505 JP2014065505W WO2014200033A1 WO 2014200033 A1 WO2014200033 A1 WO 2014200033A1 JP 2014065505 W JP2014065505 W JP 2014065505W WO 2014200033 A1 WO2014200033 A1 WO 2014200033A1
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Prior art keywords
potential
signal line
capacitor
switching element
discharge
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Ceased
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PCT/JP2014/065505
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English (en)
French (fr)
Japanese (ja)
Inventor
直昭 杉村
崇明 伊澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lapis Semiconductor Co Ltd
Yazaki Corp
Original Assignee
Lapis Semiconductor Co Ltd
Yazaki Corp
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Application filed by Lapis Semiconductor Co Ltd, Yazaki Corp filed Critical Lapis Semiconductor Co Ltd
Priority to DE112014002795.2T priority Critical patent/DE112014002795T5/de
Priority to US14/897,157 priority patent/US9857432B2/en
Publication of WO2014200033A1 publication Critical patent/WO2014200033A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries

Definitions

  • the present invention relates to a battery monitoring system, a semiconductor circuit, a disconnection detection program, and a disconnection detection method.
  • the present invention relates to a battery monitoring system for monitoring battery voltage, a semiconductor circuit, a disconnection detection program, and a disconnection detection method.
  • a battery in which a plurality of batteries (battery cells) are connected in series is used as a large-capacity and high-output battery used for driving a motor of a hybrid vehicle or an electric vehicle.
  • a specific example of such a battery is a lithium ion battery.
  • a battery monitoring system for monitoring and controlling the voltage of the battery of the battery is known.
  • a conventional battery monitoring system includes a battery cell group including a plurality of battery cells, and a semiconductor circuit that measures and controls the voltage of the battery cells included in the battery cell group.
  • the cell voltage equalization (equalizing the voltage value of each battery cell) process and charge / discharge control based on the voltage information of each battery cell obtained from the semiconductor circuit for measurement (Control of charging / discharging of each battery cell) A process etc. are performed.
  • a disconnection occurs in a signal line or the like that connects the battery cell and the semiconductor circuit for measurement, a problem may occur in the battery monitoring system.
  • Japanese Patent Laid-Open No. 2002-343445 Japanese Patent Laid-Open No. 2001-116723, Japanese Patent Laid-Open No. 2006-29923, Japanese Patent Laid-Open No. 2004-170335, Japanese Patent Laid-Open No. 2005).
  • No. -168118, JP 2004-104989 A, JP 2006-50784 A, JP 2007-225484 A, and JP 2008-175804 A JP Application Laid-Open No. 2008-175804 describes a technique for detecting disconnection of a signal line in a battery monitoring system provided with a discharge circuit for discharging the charge of a battery cell.
  • the techniques described in Japanese Unexamined Patent Application Publication No. 2006-50784, Japanese Unexamined Patent Application Publication No. 2007-225484, and Japanese Unexamined Patent Application Publication No. 2008-175804 have the following problems.
  • a resistor for detecting disconnection must always be connected between battery cells. Since a current always flows from the battery cell to the resistor, it is necessary to increase the resistance value in order to suppress a standby current (dark current). However, since the resistance value is limited, it is difficult to suppress the dark current.
  • a battery cell is used to detect disconnection.
  • the operation which short-circuits between by a switch is required.
  • the discharging operation is performed, so that the battery voltage between the battery cells may vary.
  • the techniques described in Japanese Patent Application Laid-Open Nos. 2004-170335, 2007-225484, and 2008-175804 are used to measure the battery voltage in order to determine the presence or absence of disconnection.
  • the battery voltage measurement circuit and the calculation device for calculating the measurement voltage difference are required. Since a plurality of voltages must be measured by the voltage measurement circuit and calculated by the calculation device, it takes time to detect disconnection, and it is difficult to shorten the time. Further, in a semiconductor circuit in which only one battery voltage measuring circuit is provided, it is difficult to perform a normal battery voltage cell measurement operation during the disconnection detection period.
  • An object of the present invention is to provide a battery monitoring system, a semiconductor circuit, a disconnection detection program, and a disconnection detection method capable of appropriately detecting a disconnection of a signal line related to a battery to which a discharge circuit for discharging is connected.
  • a battery monitoring system including a plurality of batteries connected in series and a first signal connected to a high potential side of each of the plurality of batteries.
  • a discharge means including a resistance element provided across the line and the second signal line connected to the low potential side of each of the plurality of batteries, and a discharge switching element connected in series to the resistance element; If the switching element for switching is provided between the resistance element and the second signal line, a potential lower than the potential of the second signal line is connected to the first signal line, and the discharging switching element is In the case where it is provided between the resistance element and the first signal line, the potential adjusting means is connected to the second signal line and supplies a potential higher than the potential of the first signal line, the resistance element and the discharge The first potential between the switching element and the first signal line Comprising a position with a threshold value which is set by the potential of the second signal line, and comparing means for comparing, and the.
  • a seventh aspect of the present invention is a battery monitoring system, wherein a plurality of batteries connected in series, a first signal line connected to a high potential side of each of the plurality of batteries, and each of the plurality of batteries
  • a discharge means including a resistance element provided across the second signal line connected to the low potential side; a discharge switching element connected in series to the resistance element; and When provided between the two signal lines, a potential lower than the potential of the second signal line is connected to the first signal line, and the discharge switching element is connected to the resistance element, the first signal line, and the second signal line. Between the first signal line and the first signal line connected to the second signal line and supplying a potential higher than the potential of the first signal line.
  • a twelfth aspect of the present invention is a semiconductor circuit, which is provided for each of a plurality of batteries connected in series, and a plurality of first signal lines connected to the high potential side of each of the plurality of batteries.
  • the discharge switching element in the discharge means including a resistance element provided across the second signal line connected to the low potential side of each of the batteries and a discharge switching element connected in series to the resistance element, When the discharge switching element is provided between the resistance element and the second signal line, the discharge switching element is connected to the first signal line and supplies a potential lower than the potential of the second signal line.
  • a thirteenth aspect of the present invention is a semiconductor circuit, provided for each of a plurality of batteries connected in series, and a plurality of first signal lines and a plurality of first signal lines connected to the high potential side of each of the plurality of batteries.
  • the discharge switching element in the discharge means including a resistance element provided across the second signal line connected to the low potential side of each of the batteries and a discharge switching element connected in series to the resistance element, When the discharge switching element is provided between the resistance element and the second signal line, the discharge switching element is connected to the first signal line and supplies a potential lower than the potential of the second signal line.
  • a fourteenth aspect of the present invention is a battery monitoring system, comprising a plurality of batteries connected in series, a first signal line connected to the high potential side of each of the plurality of batteries, and each of the plurality of batteries.
  • a discharge means including a resistance element provided across the second signal line connected to the low potential side; a discharge switching element connected in series to the resistance element; and connected to the first signal line; and
  • a first potential adjusting means having a potential lower than the potential of the second signal line; a second potential adjusting means connected to the first signal line and having a potential higher than the potential of the first signal line;
  • a first comparison means for comparing a set threshold value, a rear stage potential, a resistance element of a discharge means provided in a
  • a seventeenth aspect of the present invention is a semiconductor circuit, which is provided for each of a plurality of batteries connected in series, and a plurality of first signal lines connected to the high potential side of each of the plurality of batteries.
  • a first signal line of a discharge means including a resistance element provided across a second signal line connected to a low potential side of each of the batteries and a discharge switching element connected in series to the resistance element;
  • a first potential adjusting means connected to and lower than the potential of the second signal line; and a second potential adjustment connected to the first signal line and higher than the potential of the first signal line.
  • a battery connected to the high potential side of the battery and the first potential between the resistance element and the discharge switching element, and the rear stage potential of the rear stage part from the discharge means of the first signal line provided with the discharge means Between the resistance element of the discharge means provided in the discharge switching element and the discharge switching element.
  • a first comparison means for comparing the potential and a threshold value set from the following, a potential at the rear stage, a resistance element of the discharge means provided in the battery connected to the first potential and the low potential side of the battery, and for discharge
  • a second comparison means for comparing a third potential between the switching element and a threshold value set by the third potential.
  • An eighteenth aspect of the present invention is a disconnection detection program, and a process for detecting a disconnection of the first signal line of the battery monitoring system according to any one of the second to sixth aspects of the present invention.
  • a disconnection detection program for causing a computer to execute a step of charging a difference between a potential of a first signal line and a threshold voltage of a single inverting amplifier in a first capacitor, and a second signal line in a second capacitor Charging the difference between the potential of the first inverting amplifier and the threshold voltage of the single inverting amplifier; and inputting the first potential to the first capacitor and the second capacitor while maintaining the charges of the first capacitor and the second capacitor; Adjusting the potential of the first signal line by the potential adjusting means and outputting a comparison result from the comparing means for causing the computer to execute a process comprising: Than is.
  • a disconnection detection program for detecting a disconnection of the first signal line of the battery monitoring system according to any one of the eighth to eleventh aspects of the present invention.
  • a disconnection detection program for causing a computer to execute a step of charging a difference between a first potential and a threshold voltage of a single inverting amplifier in a first capacitor, and a third potential and a single inverting amplifier in a second capacitor.
  • a twentieth aspect of the present invention is a disconnection detection program for causing a computer to execute processing for detecting disconnection of the first signal line of the battery monitoring system according to the fifteenth aspect or the sixteenth aspect of the present invention.
  • a disconnection detection program for charging a first capacitor with a difference between a second potential and a threshold voltage of the first single inverting amplifier, and a second capacitor with a first potential and a threshold voltage of the first single inverting amplifier. Charging the difference between the first potential of the third capacitor and the threshold voltage of the second single inverting amplifier, and charging the fourth capacitor with the third potential and the threshold voltage of the second single inverting amplifier.
  • a disconnection detecting method for the first signal line of the battery monitoring system according to any one of the second to sixth aspects of the present invention.
  • the step of charging, the step of inputting the first potential to the first capacitor and the second capacitor while holding the charges of the first capacitor and the second capacitor, and the potential of the first signal line adjusted by the potential adjusting means And a step of outputting a comparison result from the comparison means.
  • a disconnection detecting method for the first signal line of the battery monitoring system according to any one of the eighth to eleventh aspects of the present invention.
  • a twenty-third aspect of the present invention is a disconnection detecting method, the disconnection detecting method of the first signal line of the battery monitoring system according to the fifteenth or sixteenth aspect of the present invention, wherein the first capacitor Charging a difference between the second potential and the threshold voltage of the first single inverting amplifier; charging a difference between the first potential and the threshold voltage of the first single inverting amplifier; and a third capacitor.
  • the potential of the first signal line is obtained by a method of inputting a post-stage potential to the first capacitor to the fourth capacitor while holding the electric charge of the capacitor to the fourth capacitor, and the first potential adjusting means or the second potential adjusting means.
  • FIG. 6 is a circuit diagram showing a state of the semiconductor circuit in the initialization operation according to the first embodiment.
  • FIG. 6 is a circuit diagram showing a state of a semiconductor circuit in a comparison operation according to the first embodiment.
  • FIG. 6 is a circuit diagram which shows an example of schematic structure of the semiconductor circuit which concerns on 2nd Embodiment.
  • FIG. 6 is a circuit diagram showing a state of a semiconductor circuit in an initialization operation according to a second embodiment.
  • FIG. 6 is a circuit diagram showing a state of a semiconductor circuit in a comparison operation according to a second embodiment. It is a circuit diagram which shows an example of schematic structure of the semiconductor circuit which concerns on 3rd Embodiment.
  • FIG. 10 is a circuit diagram showing a state of a semiconductor circuit in an initialization operation according to a third embodiment. It is a circuit diagram showing the state of the semiconductor circuit in comparison operation 1 concerning a 3rd embodiment. It is a circuit diagram showing the state of the semiconductor circuit in comparison operation 2 concerning a 3rd embodiment.
  • the battery monitoring system of the present embodiment shown in FIG. 1 includes a battery cell group 12 including a plurality of battery cells, a discharge unit 13 that discharges each battery cell in the battery cell group 12, and each battery in the battery cell group 12. And a semiconductor circuit 14 for measuring the voltage of the cell.
  • the discharge unit 13 includes a discharge circuit (see FIG. 2, discharge circuit 51, details will be described later) and LPF (low-pass filter, see FIG. 2, LPF, details will be described later).
  • the semiconductor circuit 14 includes a detection circuit 22, a storage unit 23, a switching element group 24, a comparison circuit 26, a voltage measurement cell selection switch 28, and a voltage measurement circuit 30.
  • the detection circuit 22 is a logic circuit having a function for detecting the presence or absence of disconnection of the signal lines Ln + 1 to Ln-2 based on the output OUT output from the comparison circuit 26. Upon receiving an instruction from the outside to detect the presence or absence of disconnection of the signal lines Ln + 1 to Ln-2, the detection circuit 22 outputs a control signal for controlling on / off of the switching element group 24.
  • the storage unit 23 has a function of storing the output OUT (logical values indicating H level and L level) output from the comparison circuit 26.
  • a specific example of the storage unit 23 is a register or the like.
  • the detection circuit 22 according to the present embodiment detects the presence or absence of disconnection of the signal lines Ln + 1 to Ln ⁇ 2 based on the logical value stored (stored) in the storage unit 23.
  • FIG. 2 shows an example of a schematic configuration of the discharge unit 13 and the semiconductor circuit 14 of the present embodiment.
  • the semiconductor circuit 14 of the present embodiment has a function of detecting whether or not the signal line L is disconnected between the battery cell group 12 and the discharge unit 13 (more specifically, the discharge circuit 51).
  • the battery cell group 12 includes three cells C (Cn ⁇ 1 to Cn + 1), and a semiconductor is connected via the discharge unit 13 by the signal lines Ln ⁇ 2 to Ln + 1. It is connected to the circuit 14.
  • the three cells C (Cn ⁇ 1 to Cn + 1) are collectively referred to as the cell C.
  • the signal lines Ln ⁇ 2 to Ln + 1 are collectively referred to as a signal line L.
  • the detection circuit 22 and the storage unit 23 are not shown.
  • the discharge unit 13 of the present embodiment shown in FIG. 2 includes a discharge circuit 51 and an LPF.
  • the discharge circuit 51 has a function of discharging the cell C by short-circuiting the high potential side and the low potential side of the battery cell C of the battery cell group 12.
  • the discharge circuit 51 includes a resistance element Rbal and a switching element SW (SWn ⁇ 1 to SWn + 1, generically referred to as switching element SW) connected in series with the resistance element Rbal.
  • the switching element SW uses an NMOS transistor as a specific example.
  • the switching element SW has a drain connected to the signal line L on the high potential side of the battery cell C via a resistance element Rbal for limiting the discharge amount of the cell C, and a source on the low potential side of the battery cell C. It is connected to the signal line L.
  • the switching element SW has a gate connected to the switching element SW3 and is connected to the signal line L on the low potential side via a resistance element Rcb which is a pull-down resistor.
  • a resistance element Rcb which is a pull-down resistor.
  • the gate of the switching element SW is turned on, the cells C are short-circuited and the battery cell C is discharged.
  • on / off control of the gate of the switching element SW is performed by a voltage adjustment unit IH (details will be described later) of the switching element SW3.
  • the voltage adjustment unit IH is a constant current source. When a voltage is supplied from the voltage adjustment unit IH to the signal line CB, the gate of the switching element SW is turned on.
  • the configuration of the discharge circuit 51 is not limited to this.
  • the switching element SW is a PMOS transistor, one end of the switching element SW is connected to the signal line L on the high potential side of the battery cell, and one end of the resistance element Rbal. May be connected to the signal line L on the low potential side of the battery cell C.
  • a voltage adjustment unit IL (described later in detail) of the switching element SW3.
  • the voltage adjustment unit IH supplies a higher voltage to the low potential side signal line L than to the high potential side signal line.
  • the LPF has a function of suppressing a steep voltage fluctuation generated in each cell C of the battery cell group 12 by cutting high frequency components.
  • the LPF is connected to the signal line L on the high potential side of each cell C.
  • the switching element group 24 includes a switching element SW1, switching elements SW2L and SW2H, and a switching element SW3 including voltage adjustment units IH and IL.
  • the semiconductor circuit 14 includes a signal line L, a signal line V, a signal line CB, and a signal line DV.
  • the signal line L connects the battery cell group 12 and the discharge unit 13.
  • the signal line V connects the LPF and the voltage measurement cell selection switch 28.
  • the signal line CB connects the gate of the switching element SW of the discharge circuit 51 and the switching element SW3.
  • the signal line DV connects the signal line L on the high potential side of the cell C and the switching element SW1 via the resistance element Rbal.
  • the voltage measurement cell selection switch 28 includes a plurality of internal switching elements (not shown).
  • the selection switch 28 switches the internal switching element to select the high-potential side voltage (signal line L) and the low-potential side voltage (signal line L) of the cell C to be measured / monitored. It has a function.
  • the voltage measurement circuit 30 has a function of measuring the battery voltage of the cell C based on the voltage selected by the voltage measurement cell selection switch 28.
  • the switching element SW1 has a function of connecting the signal line DV and the signal line Lc. Based on the control signal from the detection circuit 22, the switching element SW1 connects the signal line L to be subjected to disconnection detection and the signal line Lc.
  • the switching element SW1 is provided with a switching element SW1 (SW1n-2 to SW1n + 1) for each signal line L.
  • the switching elements SW1 (SW1n-2 to SW1n + 1) are collectively referred to as switching elements SW1.
  • Switching elements SW2L (SW2Ln-2 to SW2Ln + 1) and switching elements SW2H (SW2Hn-2 to SW2Hn + 1) are provided for each signal line V.
  • the switching elements SW2L (SW2Ln-2 to SW2Ln + 1) are collectively referred to as switching elements SW2L.
  • the switching elements SW2H (SW2Hn ⁇ 2 to SW2Hn + 1) are collectively referred to as switching elements SW2H.
  • the switching element SW2L has a function of connecting the signal line V and the signal line Lil based on a control signal from the detection circuit 22.
  • the switching element SW2H has a function of connecting the signal line V and the signal line Lih based on the control signal from the detection circuit 22.
  • the switching element SW3 includes switching elements SW3H (SW3Hn-1 to SW3Hn + 1), switching elements SW3L (SW3Ln-1 to SW3Ln + 1), and voltage adjustment units IH and IL which are constant current sources.
  • the switching elements SW3H (SW3Hn ⁇ 1 to SW3Hn + 1) are collectively referred to as switching elements SW3H.
  • the switching elements SW3L (SW3Ln ⁇ 1 to SW3Ln + 1) are collectively referred to as switching elements SW3L.
  • the voltage adjustment units IH and IL are described by omitting the reference numerals when referring collectively.
  • the switching elements SW3H and SW3L and the voltage adjustment units IH and IL are provided for each signal line CB.
  • the switching element SW3L has a function of connecting the signal line CB and the voltage adjusting unit IL based on a control signal from the detection circuit 22. Further, the switching element SW3L has a function of supplying the signal line L with a voltage lower than the low voltage of the signal line L supplied with a lower voltage than the signal line L. Specifically, for example, the voltage adjustment unit ILn connected to the signal line Ln by the switching element SW3Ln supplies a voltage lower than the power supply voltage supplied to the signal line Ln ⁇ 1 to the signal line Ln.
  • the switching element SW3H has a function of connecting the signal line CB and the voltage adjustment unit IH.
  • the switching element SW3H is turned on when discharging the cell C, and applies a voltage from the voltage adjustment unit IH to the gate of the switching element SW.
  • the comparison circuit (comparator) 26 of the present embodiment uses a chopper type comparator.
  • the comparison circuit 26 includes switching elements SWC1-A, SWC2-A, SWC1-B, SWC2-B, capacitors C1, C2, switching element SWC3, a single inverting amplifier NAMP having a self-threshold voltage Vx, and a latch circuit (Latch) 32. I have.
  • the switching element SWC1-A has a function of connecting the signal line Lih to the capacitor C1.
  • the switching element SWC2-A has a function of connecting the signal line Lc to the capacitor C1.
  • the switching element SWC1-B has a function of connecting the signal line Lil to the capacitor C2.
  • the switching element SWC2-B has a function of connecting the signal line Lc to the capacitor C2.
  • the latch circuit 32 has a function of determining and outputting logical values (H level and L level) from the output voltage of the single inverting amplifier NAMP.
  • the disconnection detection operation of the present embodiment is controlled by execution of a disconnection detection program in the detection circuit 22 or the like.
  • a disconnection detection program in the detection circuit 22 or the like.
  • disconnection is likely to occur at locations such as a signal line connecting a circuit such as a semiconductor circuit and a terminal (pad) for connection. Therefore, in the present embodiment, as a specific example, a case where a disconnection of the signal line Ln between the battery cell group 12 and the discharge unit 13 (see “x” marks in FIGS. 2, 4, and 5) is detected.
  • the disconnection detection operation will be described in detail.
  • the disconnection detection operation of the present embodiment is divided into an initialization operation and a comparison operation (including a diagnosis operation in the present embodiment).
  • FIG. 3 shows a flowchart of an example of the overall flow of the disconnection detection operation of the present embodiment.
  • FIG. 4 is a circuit diagram showing the state of the semiconductor circuit 14 in the initialization operation.
  • FIG. 5 is a circuit diagram showing the state of the semiconductor circuit 14 in the comparison operation.
  • the detection circuit 22 turns on the switching elements SW1 and SW2H of the signal line L for detecting disconnection and the switching element SW2L of the signal line L on the low potential side.
  • the detection circuit 22 turns on the switching elements SW1n and SW2Hn and turns on the switching element SW2Ln-1 (see FIG. 4).
  • the switching element SW1n is turned on, the signal line Ln and the signal line Lc are connected via the resistance element Rbal.
  • the switching element SW2Hn is turned on, the signal line Vn of the LPF and the signal line Lih are connected.
  • the switching element SW2Ln-1 is turned on, the signal line Vn-1 and the signal line Lil are connected.
  • the detection circuit 22 turns on the switching element SWC3 of the comparison circuit 26.
  • the voltage of the input signal line Lx of the single inverting amplifier NAMP of the comparison circuit 26 becomes the self threshold voltage Vx of the single inverting amplifier NAMP.
  • the detection circuit 22 turns on the switching element SWC1-A of the comparison circuit 26 (see FIG. 4).
  • the capacitor C1 is charged with a difference between the voltage of the signal line Vn and the self-threshold voltage Vx (voltage of the signal line Vn ⁇ self-threshold voltage Vx).
  • the switching element SWC1-B of the comparison circuit 26 is turned on (see FIG. 4).
  • the capacitor C2 is charged with the difference between the voltage of the signal line Vn-1 and the self threshold voltage Vx (the voltage of the signal line Vn-1 minus the self threshold voltage Vx).
  • steps 100 to 104 correspond to the initialization operation of the present embodiment.
  • the detection circuit 22 turns on the switching element SW3L on the high potential side of the signal line L to be detected.
  • the detection circuit 22 turns on the switching element SW3Ln + 1 (see FIG. 5).
  • the voltage adjustment unit ILn + 1 is connected to the signal line CBn + 1.
  • the gate of the switching element SWn + 1 is off.
  • the potential of the signal line Ln is pulled to the voltage adjustment unit ILn + 1 via the pull-down resistor element Rcb of the gate of the switching element SWn + 1, and the disconnection detection current is drawn.
  • the detection circuit 22 turns off the switching element SWC3 of the comparison circuit 26 (see FIG. 5).
  • the voltage at the input Lx of the single inverting amplifier NAMP is in the Hi impedance state, and the charges of the capacitors C1 and C2 charged by the above-described initialization operation are stored.
  • the detection circuit 22 turns off the switching element SWC1-A of the comparison circuit 26 and turns on the switching element SWC2-A.
  • the detection circuit 22 turns off the switching element SWC1-B and turns on the switching element SWC2-B.
  • Vx′ ⁇ Vx (Lc ⁇ V (n ⁇ 1)) ⁇ C1 / (C1 + C2) ⁇ (Vn ⁇ V (n ⁇ 1)) (4)
  • the voltage of the signal line DVn on the drain side of the switching element SWn is equal to the voltage of the signal line Ln and becomes the voltage of the signal line Lc.
  • Vnampout ⁇ Gnamp ⁇ (Vx′ ⁇ Vx) (5)
  • the output logic of the single inverting amplifier NAMP is determined by the positive / negative of the voltage Vx′ ⁇ the self threshold voltage Vx.
  • Vx′ ⁇ Vx (Lc ⁇ V (n ⁇ 1)) ⁇ C1 / (C1 + C2) ⁇ (Vn ⁇ V (n ⁇ 1))> 0 (6)
  • the signal line Lc is connected to the signal line Vn via the LPF.
  • the resistance of the LPF is Rlpf
  • the voltage of the signal line Lc from which the disconnection detection current is drawn is expressed by the equation (7) when the disconnection detection current is ILn + 1.
  • the detection circuit 22 detects the output OUT output from the comparison circuit 26.
  • the detection circuit 22 determines whether the output OUT is H level or L level. In the case of the L level, the process proceeds to step 116, and as described above, after detecting that there is no disconnection, the process proceeds to step 122. On the other hand, if it is at the H level, the process proceeds to step 118, and as described above, it is detected that there is a disconnection. If there is a disconnection, the process proceeds to step 120, for example, the operation of the battery monitoring system 10 is stopped. After the above measures are taken, the routine proceeds to step 122.
  • step 122 the detection circuit 22 determines whether or not the operation of steps 100 to 120 has been performed on all the signal lines L. If not, the detection circuit 22 returns to step 100 and repeats this operation. On the other hand, when the process is performed for all the signal lines L, the disconnection detection operation for all the signal lines L is completed, and thus this process is terminated.
  • the voltage of the signal line Vn and the self-threshold voltage Vx are applied to the capacitor C1 of the comparison circuit 26 by the initialization operation.
  • (Signal line Vn ⁇ self threshold voltage Vx) is charged.
  • the capacitor C2 is charged with a difference between the voltage of the signal line Vn ⁇ 1 and the self threshold voltage Vx (signal line Vn ⁇ 1 ⁇ self threshold voltage Vx).
  • the switching element SW1 is provided so as to connect the signal line Lc and the node between the resistance element Rbal and the switching element SWn of the discharge circuit 51.
  • the switching element SW2L is provided so as to connect the signal line Vn-1 on the rear stage side of the LPF and the signal line Lil.
  • the switching element SW2H is provided so as to connect the signal line Vn on the rear stage side of the LPF and the signal line Lih.
  • the switching element 3Ln + 1 is provided so as to connect the signal line CBn + 1 connected to the signal line Ln and the voltage adjustment unit ILn + 1 via the resistance element Rcb.
  • the disconnection of the signal line L between the battery cell group 12 and the discharge unit 13 can be appropriately detected in the semiconductor circuit 14 including the discharge unit 13, particularly the discharge circuit 51.
  • the voltage adjustment unit IL is not always connected to the signal line L (via the signal line CB and the resistance element Rcb), but is connected to the signal line L only during a period of detecting disconnection. It is possible to obtain an effect that current does not always flow from the IL and current during standby (dark current) does not occur.
  • the disconnection detection current may be set so as to satisfy the above-described equation (8), it can be made as small as possible than the discharge current when the cells C are short-circuited by the switching element SW. Accordingly, variations in battery voltage of the cell C are less likely to occur.
  • the disconnection can be appropriately detected by the comparison circuit 26, without using the voltage measurement cell selection switch 28, the voltage measurement circuit 30, or a calculation device for calculating the difference between the measured voltages, etc. Disconnection can be detected. Therefore, the disconnection detection can be performed even during the operation period of measuring the battery voltage of the cell C by using the voltage measurement cell selection switch 28 and the voltage measurement circuit 30. That is, the voltage measuring circuit 30 is one battery monitoring system 10, and the battery voltage of the normal cell C can be measured even during the period when disconnection detection is performed.
  • the voltage adjustment unit IL is provided together with the voltage adjustment unit IH for supplying a voltage to the gate of the switching element SW of the discharge circuit 51 to control on / off, and thus is provided separately. This is unnecessary, and effects such as prevention of expansion of the scale of the battery monitoring system 10 can be obtained.
  • FIG. 6 shows an example of a schematic configuration of the semiconductor circuit 40 of the present embodiment.
  • the configuration and operation substantially similar to those of the first embodiment are described as such, and detailed description thereof is omitted.
  • the switching element SW1 is provided for each signal line Vn so as to connect the signal line V and the signal line Lc in order to detect disconnection of the signal line V from the latter stage of the LPF.
  • a switching element SW3 is provided for each signal line Vn so as to draw the disconnection detection current from the signal line V.
  • the switching element SW2L is provided for each signal line DV so as to connect the signal line DV and the signal line Lil, and the switching element SW2H is configured to connect the signal line DV and the signal line Lih. It is provided for each line DV.
  • the gate of the switching element SW of the discharge circuit 51 of the discharge unit 13 is separately controlled.
  • at least the gate of the switching element SW to which each signal line used for the disconnection detection operation is connected is turned off.
  • FIG. 7 is a circuit diagram showing the state of the semiconductor circuit 40 in the initialization operation.
  • FIG. 8 is a circuit diagram showing the state of the semiconductor circuit 40 in the comparison operation.
  • the detection circuit 22 turns on the switching elements SW1 and SW2H of the signal line L for detecting disconnection and the switching element SW2L of the signal line L on the low potential side.
  • the detection circuit 22 turns on the switching elements SW1n and SW2Hn and turns on the switching element SW2Ln-1 (see FIG. 7).
  • the switching element SW1n is turned on, the signal line Vn and the signal line Lc are connected.
  • the switching element SW2Hn is turned on, the signal line DVn and the signal line Lih are connected.
  • the switching element SW2Ln-1 is turned on, the signal line DVn-1 and the signal line Lil are connected.
  • the detection circuit 22 turns on the switching element SWC3 of the comparison circuit 26.
  • the voltage of the input signal line Lx of the single inverting amplifier NAMP of the comparison circuit 26 becomes the self threshold voltage Vx of the single inverting amplifier NAMP.
  • the detection circuit 22 turns on the switching element SWC1-A of the comparison circuit 26 (see FIG. 7).
  • the capacitor C1 is charged with a difference between the voltage of the signal line DVn and the self-threshold voltage Vx (voltage of the signal line DVn ⁇ self-threshold voltage Vx).
  • the detection circuit 22 turns on the switching element SWC1-B of the comparison circuit 26 (see FIG. 7).
  • the capacitor C2 is charged with a difference between the voltage of the signal line DVn-1 and the self-threshold voltage Vx (voltage of the signal line DVn-1-self-threshold voltage Vx).
  • steps 100 to 104 correspond to the initialization operation of the present embodiment.
  • the detection circuit 22 turns on the switching element SW3L of the signal line L to be detected.
  • the detection circuit 22 turns on the switching element SW3Ln (see FIG. 8).
  • the voltage adjustment unit ILn is connected to the signal line Vn.
  • the potential of the signal line Vn is pulled by the voltage adjusting unit ILn, and the disconnection detection current is extracted.
  • the detection circuit 22 turns off the switching element SWC3 of the comparison circuit 26 (see FIG. 8).
  • the voltage at the input Lx of the single inverting amplifier NAMP is in the Hi impedance state, and the charges of the capacitors C1 and C2 charged by the above-described initialization operation are stored.
  • the detection circuit 22 turns off the switching element SWC1-A of the comparison circuit 26 and turns on the switching element SWC2-A.
  • the detection circuit 22 turns off the switching element SWC1-B and turns on the switching element SWC2-B.
  • Vx′ ⁇ Vx (Lc ⁇ DV (n ⁇ 1)) ⁇ C1 / (C1 + C2) ⁇ (DVn ⁇ DV (n ⁇ 1)) (13)
  • the voltage of the signal line DVn on the drain side of the switching element SWn becomes equal to the voltage of the signal line Ln.
  • Vx′ ⁇ Vx (Lc ⁇ DV (n ⁇ 1)) ⁇ C1 / (C1 + C2) ⁇ (DVn ⁇ DV (n ⁇ 1))> 0 (14)
  • the signal line Lc is connected to the voltage adjustment unit ILn by the switching elements SW1n and SW3Ln.
  • the voltage of the signal line Lc from which the disconnection detection current is drawn is expressed by the equation (15), where ILn is the disconnection detection current.
  • the detection circuit 22 detects the output OUT output from the comparison circuit 26.
  • the detection circuit 22 determines whether the output OUT is H level or L level. In the case of the L level, the process proceeds to step 116, and as described above, after detecting that there is no disconnection, the process proceeds to step 122. On the other hand, if it is at the H level, the process proceeds to step 118, and as described above, it is detected that there is a disconnection. If there is a disconnection, the process proceeds to step 120, and after taking a predetermined measure, the process proceeds to step 122.
  • step 122 the detection circuit 22 determines whether or not the operations of steps 100 to 120 have been performed for all the signal lines V. If not, the detection circuit 22 returns to step 100 and repeats this operation. On the other hand, when the process is performed for all the signal lines V, the disconnection detection operation for all the signal lines V is completed, and thus this process is terminated.
  • the voltage of the signal line DVn + 1 is applied to the capacitor C1 of the comparison circuit 26 by the initialization operation.
  • the difference from the self threshold voltage Vx (signal line DVn ⁇ self threshold voltage Vx) is charged.
  • the capacitor C2 is charged with a difference between the voltage of the signal line DVn ⁇ 1 and the self threshold voltage Vx (signal line DVn ⁇ 1 ⁇ self threshold voltage Vx).
  • the switching element SW1 is provided so as to connect the signal line Vn and the signal line Lc.
  • the switching element SW2Ln-1 is provided so as to connect the node between the resistance element Rbal of the discharge circuit 51 and the switching element SWn-1 and the signal line Lil.
  • the switching element SW2Hn is provided so as to connect the node between the resistance element Rbal of the discharge circuit 51 and the switching element SWn and the signal line Lih.
  • the switching element 3Ln is provided so as to connect the signal line Vn and the voltage adjustment unit ILn.
  • the semiconductor circuit 40 including the discharge unit 13, particularly the discharge circuit 51 it is possible to appropriately detect the disconnection of the signal line Vn at the subsequent stage of the discharge unit 13 (LPF).
  • the voltage adjustment unit IL (and IH) is provided in the subsequent stage of the LPF, it is not necessary to consider the influence of the LPF (resistance Rlpf) and the like when performing the disconnection detection. The disconnection detection accuracy is increased.
  • the voltage adjustment unit IL is not always connected to the signal line V, but is connected to the signal line V only during a period of detecting disconnection, so that current does not always flow from the voltage adjustment unit IL, and the standby state. The effect that no current (dark current) is generated is obtained.
  • the disconnection detection current may be set so as to satisfy the above expression (16), it can be made as small as possible than the discharge current when the cells C are short-circuited by the switching element SW. Accordingly, variations in battery voltage of the cell C are less likely to occur.
  • the disconnection can be appropriately detected by the comparison circuit 26, without using the voltage measurement cell selection switch 28, the voltage measurement circuit 30, or a calculation device for calculating the difference between the measured voltages, etc. Disconnection can be detected. Therefore, the disconnection detection can be performed even during the operation period of measuring the battery voltage of the cell C by using the voltage measurement cell selection switch 28 and the voltage measurement circuit 30. That is, the voltage measuring circuit 30 is one battery monitoring system 10, and the battery voltage of the normal cell C can be measured even during the period when disconnection detection is performed.
  • the voltage adjustment unit IL is provided together with the voltage adjustment unit IH for supplying a voltage to the gate of the switching element SW of the discharge circuit 51 to control on / off, and thus is provided separately. This is unnecessary, and effects such as prevention of expansion of the scale of the battery monitoring system 10 can be obtained.
  • the disconnection of the signal line Vn may be detected by supplying a voltage to the signal line Vn from the voltage adjustment unit IHn.
  • the disconnection detection may be performed by the disconnection detection method substantially the same as described above. Specifically, in the initialization operation, the switching element SW2Hn + 1 is turned on to charge the capacitor C1 of the comparison circuit 26 with (DVn + 1 ⁇ Vx), and the switching element SW2Ln is turned on to charge the capacitor C2 of the comparison circuit 26 with (DVn ⁇ Vx). To charge.
  • the voltage adjustment unit SW3Hn is turned on to supply a voltage to the signal line Vn.
  • the presence or absence of disconnection may be detected based on the output result output from the comparison circuit 26.
  • the other voltage adjustment unit may not be provided.
  • the configuration of the discharge circuit 51 is not limited to the above-described one, as in the first embodiment.
  • the semiconductor circuit 50 of the present embodiment includes two comparison circuits 26 (comparison circuits 26A and 26B).
  • FIG. 9 shows an example of a schematic configuration of the semiconductor circuit 50 of the present embodiment.
  • the configuration and operation that are substantially the same as those in the first embodiment and the second embodiment are described as such, and detailed description thereof is omitted.
  • the switching element SW2M is provided for each signal line DV (SW2Mn-2 to SW2LM + 1, collectively referred to as switching element SW2M).
  • the switching element SW2M has a function of connecting the signal line DVn + 1 and the signal line Lim based on a control signal from the detection circuit 22.
  • the switching element SW2H has a function of connecting the signal line V and the signal line Lih based on the control signal from the detection circuit 22.
  • the semiconductor circuit 50 includes two comparison circuits 26 (comparison circuits 26A and 26B) as described above.
  • comparison circuits 26A and 26B comparison circuits 26A and 26B
  • a chopper comparator having the same configuration is used.
  • the signal line Lih is connected to the capacitor C1 of the comparison circuit 26A by the switching element C1-A, and the signal line Lc is connected by the switching element SWC2-A. Further, the signal line Lim is connected to the capacitor C2 by the switching element C1-B, and the signal line Lc is connected by the switching element SWC2-B.
  • the signal line Lim is connected to the capacitor C1 of the comparison circuit 26B by the switching element C1-A, and the signal line Lc is connected by the switching element SWC2-A. Further, the signal line Lil is connected to the capacitor C2 by the switching element C1-B, and the signal line Lc is connected by the switching element SWC2-B.
  • FIG. 10 is a circuit diagram showing the state of the semiconductor circuit 50 in the initialization operation.
  • FIG. 11 shows the state of the semiconductor circuit 50 in the comparison operation 1.
  • FIG. 12 is a circuit diagram showing the state of the semiconductor circuit 50 in the comparison operation 2.
  • the switching element 2H of the signal line DV on the high potential side, the switching element 2M of the signal line DV corresponding to the signal line to be detected, and the switching element SW2L of the signal line DVn on the low potential side are turned on.
  • the detection circuit 22 turns on the switching elements SW2Hn + 1, SW2Mn, and SW2Ln ⁇ 1 (see FIG. 10).
  • the switching element SW2Hn + 1 is turned on, the signal line DVn + 1 and the signal line Lih are connected.
  • the switching element 2Mn is turned on, the signal line DVn and the signal line Lim are connected.
  • the switching element SW2Ln-1 is turned on, the signal line DVn-1 and the signal line Lil are connected.
  • the voltage of the input signal line Lx of the single inverting amplifier NAMP of the comparison circuit 26 becomes the self threshold voltage Vx of the single inverting amplifier NAMP.
  • the detection circuit 22 turns on the switching element SWC1-A of the comparison circuit 26A (see FIG. 10). As a result, the capacitor C1 of the comparison circuit 26A is charged with a difference between the voltage of the signal line DVn + 1 and the self threshold voltage Vx (the voltage of the signal line DVn + 1 ⁇ the self threshold voltage Vx). Further, the detection circuit 22 turns on the switching element SWC1-B of the comparison circuit 26A (see FIG. 10). As a result, the capacitor C2 is charged with the difference between the voltage of the signal line DVn and the self-threshold voltage Vx (voltage of the signal line DVn ⁇ self-threshold voltage Vx).
  • the detection circuit 22 turns on the switching element SWC1-A of the comparison circuit 26B (see FIG. 10). As a result, the capacitor C1 of the comparison circuit 26B is charged with a difference between the voltage of the signal line DVn and the self threshold voltage Vx (the voltage of the signal line DVn ⁇ the self threshold voltage Vx). Further, the detection circuit 22 turns on the switching element SWC1-B of the comparison circuit 26B (see FIG. 10). As a result, the capacitor C2 is charged with a difference between the voltage of the signal line DVn-1 and the self-threshold voltage Vx (voltage of the signal line DVn-1-self-threshold voltage Vx).
  • the detection circuit 22 turns on the switching elements SW1 and SW3L of the signal line V to be detected.
  • the detection circuit 22 turns on the switching element SW1n and the switching element SW3Ln (see FIG. 11).
  • the switching element SW1n is turned on, the signal line Vn and the signal line Lc are connected.
  • the switching element SW3Ln is turned on, the voltage adjustment unit ILn is connected to the signal line Vn.
  • the potential of the signal line Vn is pulled by the voltage adjusting unit ILn, and the disconnection detection current is extracted.
  • the detection circuit 22 turns off the switching element SWC3 of the comparison circuits 26A and 26B (see FIG. 11), sets the voltage of the input Lx of the single inverting amplifier NAMP to the Hi impedance state, and charges the capacitor C1 charged by the above-described initialization operation. C2 charge is stored.
  • the detection circuit 22 turns off the switching element SWC1-A of the comparison circuit 26A and turns on the switching element 2-A.
  • the detection circuit 22 turns off the switching element SWC1-B and turns on the switching element 2-B.
  • the signal line Lc is connected to the capacitors C1 and C2, and the voltage Vn of the signal line Vn is supplied.
  • the detection circuit 22 turns off the switching element SWC1-A of the comparison circuit 26B and turns on the switching element 2-A.
  • the detection circuit 22 turns off the switching element SWC1-B and turns on the switching element 2-B.
  • the signal line Lc is connected to the capacitors C1 and C2, and the voltage Vn of the signal line Vn is supplied.
  • the detection circuit 22 detects the output OUT1 from the comparison circuit 26A and the output OUT2 from the comparison circuit 26B, as in the first and second embodiments.
  • Vx′ ⁇ Vx ⁇ 0 and the output OUT1 H level.
  • Vx′ ⁇ Vx> 0 and the output OUT1 L level.
  • the detection circuit 22 turns on the switching elements SW1 and SW3H of the signal line V to be detected.
  • the detection circuit 22 turns on the switching element SW1n and the switching element SW3Hn (see FIG. 12).
  • the switching element SW1n is turned on, the signal line Vn and the signal line Lc are connected.
  • the switching element SW3Hn is turned on, the voltage adjustment unit IHn is connected to the signal line Vn.
  • a potential is supplied to the signal line Vn from the voltage adjustment unit ILn, and the potential of the signal voltage Vn increases.
  • the detection circuit 22 After charging the capacitors C1 and C2 in the initialization operation, the detection circuit 22 turns off the switching element SWC3 of the comparison circuits 26A and 26B (see FIG. 12), and the voltage of the input Lx of the single inverting amplifier NAMP is set to the Hi impedance. In this state, the charges of the capacitors C1 and C2 charged by the above-described initialization operation are stored.
  • the detection circuit 22 turns off the switching element SWC1-A of the comparison circuit 26A and turns on the switching element 2-A.
  • the detection circuit 22 turns off the switching element SWC1-B and turns on the switching element 2-B.
  • the signal line Lc is connected to the capacitors C1 and C2, and the voltage Vn of the signal line Vn is supplied.
  • the detection circuit 22 turns off the switching element SWC1-A of the comparison circuit 26B and turns on the switching element 2-A.
  • the detection circuit 22 turns off the switching element SWC1-B and turns on the switching element 2-B.
  • the signal line Lc is connected to the capacitors C1 and C2, and the voltage Vn of the signal line Vn is supplied.
  • the detection circuit 22 detects the output OUT1 from the comparison circuit 26A and the output OUT2 from the comparison circuit 26B, as in the first and second embodiments.
  • the signal line Vn is not disconnected, as in the comparison operation 1
  • Vx′ ⁇ Vx ⁇ 0 and the output OUT1 H level.
  • Vx′ ⁇ Vx> 0 and the output OUT1 L level.
  • the comparison operation 1 and the comparison operation 2 are performed.
  • the detection circuit 22 has the output logic (level) of the outputs OUT1 and OUT2 as H and L. If it is reverse logic, it is detected that there is no disconnection.
  • the output logic (level) of the outputs OUT1 and OUT2 is the same in both the comparison operation 1 and the comparison operation 2, but HH and LL are opposite logic in the comparison operation 1 and the comparison operation 2. If it is, it is detected that there is a disconnection.
  • the detection circuit 22 determines that the diagnosis function (comparing circuits 26A and 26B) has failed. Therefore, in the semiconductor circuit 50 including the discharge unit 13, particularly the discharge circuit 51, the disconnection of the signal line Vn at the subsequent stage of the discharge unit 13 (LPF) can be appropriately detected.
  • the disconnection detection and the disconnection detection current are supplied in the state where the disconnection detection current is drawn to the signal line Vn to be detected using the two comparison circuits 26.
  • the disconnection detection and the disconnection detection current are supplied in the state where the disconnection detection current is drawn to the signal line Vn to be detected using the two comparison circuits 26.
  • the configuration of the discharge circuit 51 is not limited to the above-described one as in the first embodiment and the second embodiment.
  • the disconnection of the signal line L is detected based on the logical value (H level, L level) of the output OUT, and the signal line
  • the logical values of the outputs OUT of all the signal lines L are obtained and stored in the storage unit 23. Based on the logical values of the outputs OUT of all the signal lines L stored in the storage unit 23, Presence / absence may be detected and a predetermined measure may be executed.
  • the output OUT is stored in the storage unit 23, and after all the comparison operations are completed, the disconnection is determined based on the logical values of all the output OUT stored in the storage unit 23. Presence / absence may be detected and a predetermined measure may be executed.
  • the detection circuit 22 and the storage unit 23 are provided in the semiconductor circuits 14, 40, and 50. It may be formed (on the chip). Also, a function for instructing the detection circuit 22 to detect a disconnection and a function for monitoring the logical value stored in the storage unit 23 and diagnosing the presence or absence of a disconnection are provided in the semiconductor circuits 14, 40, and 50. Alternatively, it may be formed outside (on another chip).

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  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
PCT/JP2014/065505 2013-06-14 2014-06-11 電池監視システム、半導体回路、断線検出プログラム、及び断線検出方法 Ceased WO2014200033A1 (ja)

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JP6539618B2 (ja) * 2016-07-21 2019-07-03 矢崎総業株式会社 電池監視システム
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