WO2023042860A1 - 電圧測定装置及び組電池システム - Google Patents

電圧測定装置及び組電池システム Download PDF

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Publication number
WO2023042860A1
WO2023042860A1 PCT/JP2022/034446 JP2022034446W WO2023042860A1 WO 2023042860 A1 WO2023042860 A1 WO 2023042860A1 JP 2022034446 W JP2022034446 W JP 2022034446W WO 2023042860 A1 WO2023042860 A1 WO 2023042860A1
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WIPO (PCT)
Prior art keywords
voltage
battery cells
capacitors
battery
battery cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/034446
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English (en)
French (fr)
Japanese (ja)
Inventor
尚久 羽谷
俊明 尾関
悟朗 森
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Nuvoton Technology Corp Japan
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Nuvoton Technology Corp Japan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuvoton Technology Corp Japan filed Critical Nuvoton Technology Corp Japan
Priority to CN202280061559.8A priority Critical patent/CN117940779A/zh
Priority to JP2023548488A priority patent/JPWO2023042860A1/ja
Priority to EP22870007.6A priority patent/EP4403929B1/en
Publication of WO2023042860A1 publication Critical patent/WO2023042860A1/ja
Priority to US18/602,691 priority patent/US20240222820A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to a voltage measuring device and an assembled battery system.
  • Patent Literature 1 discloses a device in which a voltage detection terminal is provided with an RC filter and a node of a capacitor on the opposite side of the voltage detection terminal is connected to GND.
  • the capacitors connected to the upper battery cells of the assembled battery have a voltage between the total voltage corresponding to the number of battery cells and GND. potential difference is generated, there is a problem that a high withstand voltage characteristic is required.
  • the present disclosure provides a voltage measuring device and an assembled battery system capable of lowering the withstand voltage characteristics required for capacitors connected to battery cells.
  • a voltage measurement device is a voltage measurement that independently detects the voltage of each of the plurality of battery cells in an assembled battery in which n (n is an integer equal to or greater than 2) battery cells are connected in series.
  • a device comprising: a positive electrode of the highest battery cell among the plurality of battery cells, a negative electrode of the lowest battery cell among the plurality of battery cells, and a contact between the battery cells of the plurality of battery cells. (n+1) first resistor elements to which first terminals are connected respectively, and (n+1) first terminals to which second terminals of the (n+1) first resistor elements are connected and a voltage measuring unit connected to a second terminal of each of the (n+1) first resistor elements, two of the (n+1) first capacitors.
  • the second terminal of the first capacitor is connected to the positive electrode of the k-th battery cell (k is an integer from 1 to n ⁇ 1) among the plurality of battery cells.
  • An assembled battery system includes the voltage measuring device described above and an assembled battery in which n (n is an integer equal to or greater than 2) battery cells are connected in series.
  • FIG. 1 is a block diagram showing the configuration of an assembled battery system according to Embodiment 1.
  • FIG. 2 is a block diagram showing a configuration of an assembled battery system according to a modification of Embodiment 1.
  • FIG. 3 is a block diagram showing the configuration of an assembled battery system according to Embodiment 2.
  • FIG. 4 is a block diagram showing a configuration of an assembled battery system according to Modification 1 of Embodiment 2.
  • FIG. 5 is a block diagram showing the configuration of an assembled battery system according to Modification 2 of Embodiment 2. As shown in FIG.
  • each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, for example, scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code
  • ordinal numbers such as “first” and “second” do not mean the number or order of constituent elements unless otherwise specified, so as to avoid confusion between constituent elements of the same kind and to distinguish between them. It is used for the purpose of
  • the assembled battery system 1 includes an assembled battery 200 and a voltage measuring device 100 .
  • the assembled battery system 1 measures the voltages of the plurality of battery cells B1 to Bn included in the assembled battery 200 in order to manage the state of the battery system in the battery management system that manages the state of the battery system including one or more assembled batteries 200. do.
  • the assembled battery system 1 may be one component of a battery management system.
  • n is a positive integer (eg, an integer of 2 or more (that is, a natural number of 2 or more)), and k is an integer of 1 or more and n ⁇ 1 or less.
  • Both ends of each of the plurality of battery cells B1 and the like are connected to the voltage measurement unit 30 via two voltage detection lines out of the plurality of voltage detection lines L1 to Ln+1.
  • the number of the plurality of battery cells B1 to Bn included in the assembled battery 200 and the voltage of each of the plurality of battery cells B1 to Bn are not particularly limited.
  • Each of the plurality of battery cells B1 to Bn may be battery cells of the same standard, for example.
  • the assembled battery 200 is an object to be measured by the voltage measuring device 100 .
  • the plurality of battery cells B1 to Bn are also referred to as the plurality of battery cells B1 and the like. Moreover, when referring to any one battery cell, it may be simply referred to as a battery cell and may not be numbered.
  • the battery cell Bn is the battery cell arranged on the highest potential side among the plurality of battery cells B1 and the like, and is the highest battery cell among the plurality of battery cells B1 and the like.
  • the battery cell B1 is the battery cell arranged on the lowest potential side among the plurality of battery cells B1 and the like, and is the lowest battery cell among the plurality of battery cells B1 and the like.
  • the voltage measuring device 100 measures the voltage of the assembled battery 200 .
  • the voltage measuring device 100 independently detects voltages of the plurality of battery cells B1 and the like included in the assembled battery 200 .
  • the voltage measuring device 100 is configured to be able to individually measure the voltages of a plurality of battery cells B1 and the like. This makes it possible to measure the voltage even when the voltage is too high to directly measure the voltage of the entire assembled battery 200, and it is also possible to determine the operation of each of the plurality of battery cells B1 and the like. Become.
  • the voltage measurement device 100 sequentially measures voltages of a plurality of battery cells B1 and the like.
  • the voltage measurement device 100 includes a plurality of voltage detection lines L1 to Ln+1, a resistor group 10, a capacitor group 20, a wire Lb1, and a voltage measurement section 30. Also, the resistor group 10 and the capacitor group 20 constitute a filter circuit.
  • the plurality of voltage detection lines L1 to Ln+1 include voltage detection lines L1, L2, L3, Lk-1, Lk, Lk+1, Lk+2, Ln-1, Ln and Ln+1, and detect voltages of the plurality of battery cells B1 and the like. Wiring for measurement.
  • the plurality of voltage detection lines L1 to Ln+1 are composed of nodes arranged between the battery cells and outside the battery cells at both ends (black circles in the dashed frame indicating the assembled battery 200 in FIG. 1), and the voltage measurement unit 30. Connect between the input terminals S1 to Sn+1.
  • the voltage detection lines Ln+1 and Ln are provided to measure the voltage of the battery cell Bn, the voltage detection line Ln+1 connects the positive electrode of the battery cell Bn and the input terminal Sn+1, and the voltage detection line Ln connects the battery cell Bn. is connected to the input terminal Sn.
  • the voltage detection lines Ln and Ln-1 are provided for measuring the voltage of the battery cell Bn-1, the voltage detection line Ln connects the positive electrode of the battery cell Bn-1 and the input terminal Sn, A voltage detection line Ln-1 connects the negative electrode of the battery cell Bn-1 and the input terminal Sn-1.
  • the voltage detection line Ln is wiring common to the negative electrode of the battery cell Bn and the positive electrode of the battery cell Bn-1.
  • Each of the voltage detection lines L2 to Ln is wiring common to adjacent battery cells.
  • the plurality of voltage detection lines L1 to Ln+1 are provided by the number of the plurality of battery cells B1, etc.+1. Also, hereinafter, the plurality of voltage detection lines L1 to Ln+1 will also be referred to as the plurality of voltage detection lines L1 and the like. Also, when referring to any one voltage detection line, it may simply be referred to as a voltage detection line and may not be numbered.
  • the voltage of each battery cell such as the plurality of battery cells B1 is input to the voltage measurement section 30 via the plurality of voltage detection lines L1 and the like and the filter circuit.
  • the resistor group 10 has a plurality of resistor elements R1 to Rn+1 including resistor elements R1, R2, R3, Rk-1, Rk, Rk+1, Rk+2, Rn-1, Rn and Rn+1.
  • Each of the plurality of resistance elements R1 to Rn+1 is arranged on each of the plurality of voltage detection lines L1 to Ln+1. That is, one resistance element is arranged for one voltage detection line.
  • a resistive element is realized, for example, by a resistor having a desired resistance value.
  • Each of the plurality of resistance elements R1 to Rn+1 has a first terminal connected to the positive electrode of the highest battery cell Bn, the negative electrode of the lowest battery cell B1, and a contact (node) between the battery cells.
  • a second terminal is connected to the voltage measuring section 30 .
  • the plurality of resistance elements R1 to Rn+1 will also be referred to as the plurality of resistance elements R1 and the like.
  • the resistive element is an example of a first resistive element
  • the plurality of resistive elements R1 to Rn+1 is an example of (n+1) first resistive elements.
  • the capacitor group 20 has a plurality of capacitors C1 to Cn+1 including capacitors C1, C2, C3, Ck-1, Ck, Ck+1, Ck+2, Cn-1, Cn and Cn+1.
  • Each of the plurality of capacitors C1 to Cn+1 has, for example, similar breakdown voltage characteristics.
  • a first terminal (first electrode) of each of the plurality of capacitors C1 to Cn+1 is connected to a second terminal of each of the plurality of resistance elements R1 to Rn+1. That is, the second terminal of one resistance element is connected to the first terminal of one capacitor.
  • Second terminals (second electrodes) of the plurality of capacitors C1 to Cn+1 are connected to each other by wiring Lc and have the same potential.
  • the wiring Lc may connect the second terminal of each of two or more capacitors including the capacitor Cn+1 among the plurality of capacitors C1 to Cn+1 to the wiring Lb1.
  • the wiring Lc is not connected to a DC (Direct Current) stable node such as GND (ground) or the power source of the voltage measurement unit 30 .
  • the plurality of capacitors C1 to Cn+1 will also be referred to as the plurality of capacitors C1 and the like. Also, when referring to any one capacitor, it may simply be described as a capacitor and may not be given a symbol.
  • the capacitors are examples of first capacitors, and capacitors C1 to Cn+1 are examples of (n+1) first capacitors.
  • the filter circuit is a circuit for removing ripples (noise) contained in the DC voltage. As shown in the resistor group 10 and the capacitor group 20, the filter circuit is composed of n+1 RC filters connected to each of the plurality of voltage detection lines L1 to Ln+1. The filter circuit can remove ripples contained in the DC voltages input to the voltage measurement unit 30 from each of the plurality of voltage detection lines L1 to Ln+1.
  • the wiring Lb1 is a wiring for connecting the positive electrode of the battery cell Bk and the wiring Lc.
  • the line Lb1 connects the node between the battery cells Bk and Bk-1 and the line Lc. That is, the voltage measuring device 100 sets the second terminal of each of the plurality of capacitors C1, etc., to the intermediate potential in the assembled battery 200 instead of GND (in the example of FIG. 1, the total voltage of the battery cells B1 to Bk). . It can also be said that the second terminal of each of the plurality of capacitors C1 and the like is grounded to the intermediate potential.
  • the intermediate potential is a voltage higher than the voltage of the battery cell B1 and lower than the total potential of the battery cells B1 to Bn-1. Note that the wiring Lb1 is not connected to the voltage measurement unit 30.
  • the second terminal of each of the plurality of capacitors C1, etc., and the positive electrode of the k-th battery cell Bk among the plurality of battery cells B1, etc. are connected by the wiring Lb1.
  • the potential difference generated in the capacitor Cn+1 is the sum of the first total voltage (the voltage at the first terminal of the capacitor Cn+1), which is the sum of the voltages of the battery cells B1 to Bn, and the sum of the voltages of the battery cells B1 to Bk. is the difference voltage from the second total voltage (the voltage at the second terminal of the capacitor Cn+1). That is, the potential difference generated in the capacitor Cn+1 is the third total voltage, which is the sum of the voltages of the battery cells Bk+1 to Bn.
  • the potential difference generated in the capacitor C1 is the voltage on the negative electrode side of the battery cell B1 (the voltage at the first terminal of the capacitor C1) and the total voltage of the battery cells B1 to Bk (the second voltage of the capacitor C1). terminal voltage).
  • the potential difference generated across the capacitor C1 is the second total voltage, which is the sum of the voltages of the battery cells B1 to Bk.
  • the potential difference generated in the capacitor Ck+1 is zero.
  • the battery cell Bk is preferably the battery cell arranged in the center of the assembled battery 200 from the viewpoint of lowering the withstand voltage characteristics required for the capacitors connected to the battery cells.
  • the line Lb1 may be connected so as to connect the node between the two battery cells connected in series with the line Lc.
  • the second terminals of two or more capacitors among the plurality of capacitors C1 and the like and the positive electrode of the k-th battery cell Bk among the plurality of battery cells B1 and the like are connected by the wiring Lb1. It should be connected.
  • the value of k is not limited to the above.
  • the predetermined range is, for example, the voltage of several battery cells, but is not limited to this.
  • the voltage measurement unit 30 is a device that detects the voltage of each of the plurality of battery cells B1 and the like.
  • the voltage measurement unit 30 is configured including, for example, an IC (Integrated Circuit).
  • the voltage measurement unit 30 has a switch unit 31 and an AD converter (ADC: Analog to Digital Converter) 32 .
  • the voltage measurement unit 30 has a plurality of input terminals including input terminals S1, S2, S3, Sk-1, Sk, Sk+1, Sk+2, Sn-1, Sn and Sn+1 to which the plurality of voltage detection lines L1 and the like are respectively connected. It has terminals S1 to Sn+1.
  • the voltage measurement section 30 may have a control section or the like for storing each cell voltage converted into digital data.
  • the switch unit 31 is realized by, for example, a multiplexer having a plurality of switches.
  • a switch is provided for each of the plurality of input terminals S1 to Sn+1.
  • a relay for example, a photo MOS relay or the like is used as the switch, but it is not limited to this.
  • the switch unit 31 sequentially selects the voltages of the plurality of battery cells B1 and the like in the assembled battery 200 periodically and outputs them to the AD converter 32 .
  • the switch unit 31 is controlled to turn on and off a plurality of switches so as to measure the voltage of each battery cell.
  • the AD converter 32 converts the voltage (analog value) output from the switch section 31 into a digital value and outputs it to a processing section such as a control section.
  • the voltage measurement unit 30 operates by receiving power supply from the outside.
  • the voltage measurement unit 30 may be connected to the positive electrode of the battery cell Bn via the wiring Lp1, for example, and may be supplied with power.
  • the voltage measurement unit 30 is connected to a DC stable node through a wiring Lp2, and in the example of FIG. 1, is connected to the negative electrode of the lowest battery cell B1.
  • the DC-stable node may be, for example, GND (for example, the GND of the board on which the voltage measurement unit 30 is mounted).
  • the voltage measuring device 100 measures each of the plurality of battery cells B1 and the like in the assembled battery 200 in which n (n is an integer equal to or greater than 2) battery cells B1 and the like are connected in series. It is a voltage measuring device that detects voltage independently.
  • the voltage measurement device 100 measures the positive electrode of the highest battery cell Bn among the plurality of battery cells B1 and the like, the negative electrode of the lowest battery cell B1 among the plurality of battery cells B1 and the like, and the battery cells B1 and the like.
  • a plurality of resistive elements R1 (an example of (n+1) first resistive elements) each having a first terminal connected to a contact between cells, and a second terminal of each of the resistive elements R1, etc.
  • a plurality of capacitors C1 and the like (an example of (n+1) first capacitors) to which the first terminals are connected, and a voltage measuring unit 30 connected to the second terminals of the plurality of resistor elements R1 and the like are connected.
  • the second terminals of two or more capacitors among the plurality of capacitors C1 and the like are connected to the positive electrodes of the k-th (k is an integer of 1 or more and n ⁇ 1 or less) battery cells Bk among the plurality of battery cells B1 or the like. connected to
  • the second terminal of the capacitor Cn+1 connected to the highest battery cell Bn can be set to the total voltage of the battery cells B1 to Bk, for example. That is, the potential difference generated in the capacitor Cn+1 can be made smaller than when the second terminal of the capacitor Cn+1 is connected to GND or the like. Therefore, the voltage measuring device 100 can lower the withstand voltage characteristics required for the capacitors connected to the battery cells. This contributes to a reduction in component costs in voltage measuring device 100 .
  • the second terminals of the (n+1) plurality of capacitors C1 and the like are connected to the positive electrode of the k-th battery cell Bk.
  • the voltage measuring device 100 can provide a wiring (for example, a wiring Lc) for setting the second terminals of the capacitors C1 and the like to the same potential.
  • a wiring for example, a wiring Lc
  • the required withstand voltage characteristics can be lowered.
  • the k-th battery cell Bk is the n/2th battery cell such as the plurality of battery cells B1.
  • the voltage measuring device 100 can further lower the withstand voltage characteristics required for the capacitors connected to the battery cells.
  • the assembled battery system 1 includes the above-described voltage measuring device 100 and n (n is an integer equal to or greater than 2) battery cells B1 or the like connected in series. and a battery 200 .
  • FIG. 2 is a block diagram showing the configuration of an assembled battery system 1a according to this modification.
  • the reference numerals of the voltage detection lines and input terminals are omitted in order to avoid complication.
  • a voltage measuring device 100a according to this modification differs from the voltage measuring device 100 according to the first embodiment in that it includes a resistive element 11 and a capacitor 21 (that is, an RC filter).
  • the resistance element 11 (RCM in FIG. 2) is arranged on the wiring Lb1.
  • the resistance element 11 is arranged between the first terminal of the resistance element Rk+1 and the wiring Lc.
  • the resistive element 11 is realized by a resistor having a desired resistance value, for example.
  • the resistance element 11 is an example of a second resistance element.
  • the capacitor 21 (CCM in FIG. 2) is arranged on the wiring Lc.
  • a first terminal (first electrode) of the capacitor 21 is connected to a second terminal of each of the plurality of capacitors C1 and the like via a wiring Lc. That is, the first terminal of the capacitor 21 is supplied with the intermediate potential in the assembled battery 200 (the total voltage of the battery cells B1 to Bk in the example of FIG. 2).
  • a second terminal (second electrode) of the capacitor 21 is connected to the negative electrode (line Lp2) of the battery cell B1. Note that the second terminal of the capacitor 21 may be connected to a DC stable node.
  • Capacitor 21 is an example of a second capacitor.
  • the resistor element 11 and the capacitor 21 arranged in this way function as an RC filter.
  • the connection position of the capacitor 21 is not limited to the position shown in FIG. 2, and may be connected to any battery cell terminal.
  • the second terminals of two or more capacitors among the plurality of capacitors C1 and the like and the positive electrode of the k-th battery cell Bk among the plurality of battery cells B1 and the like are connected by the wiring Lb1. It should be connected. That is, the voltage measuring device 100a includes a resistor element 11 connected between the second terminal of each of two or more capacitors C1 and the like and the positive electrode of the k-th battery cell Bk; A capacitor 21 connected to the second terminal of each of more than one capacitor may be provided.
  • the voltage measuring device 100a includes a resistive element connected between the second terminal of each of the two or more first capacitors and the positive electrode of the k-th battery cell Bk. 11 (an example of a second resistor element), and a capacitor 21 (an example of a second capacitor) connected to the second terminals of each of the two or more first capacitors.
  • the resistance element 11 and the capacitor 21 function as an RC filter, so that the voltage measuring device 100a can remove ripples contained in the DC voltage input to the line Lc through the line Lb1. That is, the voltage measuring device 100a can suppress fluctuations in the voltages of the second terminals of the plurality of capacitors C1 and the like due to noise contained in the DC voltage. Further, since the intermediate potential of the assembled battery 200 is supplied to the first terminal of the capacitor 21, the potential difference generated in the capacitor Cn+1 is the same as in the first embodiment. In other words, the voltage measuring device 100a can remove the influence of noise while maintaining the effect of lowering the withstand voltage characteristics required for the capacitors connected to the battery cells.
  • FIG. 3 is a block diagram showing the configuration of an assembled battery system 1b according to this embodiment.
  • a voltage measuring device 100b according to the present embodiment differs from the voltage measuring device 100 according to the first embodiment in that the filter circuit is realized by two circuits, a first filter circuit and a second filter circuit. .
  • the first filter circuit is a circuit for measuring the voltage of each of the battery cells B1 to Bm (m is an integer greater than or equal to 1 and less than k), and has a first resistor group 10a and a first capacitor group 20a.
  • the first filter circuit has m+1 RC filters.
  • Second terminals of the capacitors C1 to Cm+1 are connected by a wiring Lc1. That is, the second terminals of the capacitors C1 to Cm+1 connected to the m-th battery cells among the plurality of battery cells B1 and the like are connected. As a result, the second terminals of the capacitors C1 to Cm+1 have the same potential.
  • the wiring Lc1 is connected to GND (for example, the GND of the board on which the voltage measuring section 30 is mounted), so the second terminals of the capacitors C1 to Cm+1 are at 0V.
  • n is a positive integer (eg, an integer of 3 or more), and k is an integer of 2 or more and n-1 or less.
  • the second filter circuit is a circuit for measuring the voltage of each of the battery cells Bm+1 to Bn, and has a second resistor group 10b and a second capacitor group 20b.
  • the second filter circuit has n+1-m RC filters.
  • Second terminals of the capacitors Cm+2 to Cn+1 and 22 are connected by a wiring Lc2. That is, each of the second terminals of the capacitors Cm+2 to Cn+1 and 22 connected to the m+1-th to n-th battery cells including the k-th battery cell Bk among the plurality of battery cells B1 and the like is connected It is It can also be said that the second terminals of the plurality of capacitors C1 and the like are divided into two sets each having two or more second terminals connected to each other. In the example of FIG. 3, the capacitors C1 to Cm+1 form one set, and the capacitors Cm+2 to Cn+1 and 22 form one set.
  • the second terminals of the capacitors Cm+2 to Cn+1 and 22 are at the same potential.
  • the wiring Lc2 is connected to GND (for example, the GND of the board on which the voltage measurement unit 30 is mounted), so the second terminals of the capacitors Cm+2 to Cn+1 and 22 are connected to the battery cells Bm+1 to Bk is the total voltage of each. In this case, the potential difference generated across the capacitor Ck+1 is zero.
  • Capacitors Cm+2 to Cn+1 are examples of two or more first capacitors.
  • the wirings Lc1 and Lc2 may be connected to a common DC-stable node (eg, common GND) or may be connected to different DC-stable nodes (eg, different GNDs). good too.
  • a common DC-stable node eg, common GND
  • different DC-stable nodes eg, different GNDs
  • a wiring Lb2 is provided to connect the node between the battery cells Bm and Bm+1 and the input terminal Ssplit of the voltage measurement unit 30 .
  • the voltage measuring device 100b also includes a resistance element 12 (Rsplit shown in FIG. 3) arranged on the wiring Lb2 and a capacitor 22 (Csplit shown in FIG. 3), which constitute an RC filter.
  • a resistance element 12 Rsplit shown in FIG. 3
  • a capacitor 22 Csplit shown in FIG. 3
  • the resistance element 12 has a first terminal connected to the positive electrode of the m-th battery cell Bm, and a second terminal connected to the voltage measuring section 30 .
  • the resistive element 12 is implemented by, for example, a resistor having a desired resistance value.
  • the resistance element 12 is an example of a third resistance element.
  • the capacitor 22 has a first terminal (first electrode) connected to the second terminal of the resistance element 12 , and a second terminal (second electrode) connected to the first terminal (first electrode) of the capacitor 21 . ) is connected. A second terminal of the capacitor 22 is connected to the positive terminal of the kth battery cell.
  • Capacitor 22 is an example of a third capacitor.
  • n+2 RC filters are provided.
  • the potential difference generated in the capacitor Cn+1 is the sum of the fourth total voltage (the voltage at the first terminal of the capacitor Cn+1), which is the sum of the voltages of the battery cells Bm+1 to Bn, and the sum of the voltages of the battery cells Bm+1 to Bk. is the differential voltage from the fifth total voltage (the voltage at the second terminal of the capacitor Cn+1).
  • the potential difference generated in the capacitor Cn+1 is the sixth total voltage, which is the sum of the voltages of the battery cells Bk+1 to Bn.
  • the potential difference generated in the capacitor Cm+1 is the voltage difference between GND and the total voltage of the battery cells B1 to Bm (the voltage at the second terminal of the capacitor Cm+1).
  • the potential difference generated in the capacitor Cm+1 becomes the seventh total voltage, which is the sum of the voltages of the battery cells B1 to Bm.
  • the potential difference generated in the capacitor 22 is the voltage difference between the negative electrode of the battery cell Bm+1 and the total voltage of the battery cells Bm+1 to Bk (the voltage at the second terminal of the capacitor 22). That is, the potential difference generated in the capacitor 22 is the eighth total voltage, which is the sum of the voltages of the battery cells Bm+1 to Bk.
  • the battery cell Bm is the n/3th battery cell from the low potential side among the plurality of battery cells B1 and the like. It is preferable that the battery cell Bk is the 2n/3th battery cell from the low potential side among the plurality of battery cells B1 and the like.
  • n / 3th means n / 3th when n is a multiple of 3, and when n is other than a multiple of 3, ((n-1) or (n + 1)) / 3 means eyes.
  • the number of battery cells B1 to Bm, the number of battery cells Bm+1 to Bk, and the number of battery cells Bk+1 to Bn may be the same or the difference between the numbers may be 1 or less.
  • the values of m and k are not limited to the above.
  • the maximum potential difference generated in any one of the capacitors Cm+2 to Ck+1 and 22 connected to the cells Bm+1 to Bk (for example, the potential difference generated in the capacitor C22) and any of the capacitors Ck+1 to Cn+1 connected to the battery cells Bk+1 to Bn
  • the maximum potential difference (for example, the potential difference occurring in the capacitor Cn+1) that occurs in the above may be determined to match or be within a predetermined range.
  • the predetermined range is, for example, the voltage of several battery cells, but is not limited to this.
  • the first filter circuit is also provided with a wiring Lb1 so as to connect one of the voltage detection lines L2 to Lm to the wiring Lc1, and the resistance element 11 and the capacitor 21 are provided so as to form an RC filter.
  • the wiring Lc1 may not be provided in the second filter circuit.
  • the second terminals of the capacitors C1 to Cm+1 connected to the battery cells B1 to Bm are not limited to being connected to each other. It is sufficient if they are connected to each other.
  • the second terminals of the capacitors C1 to Cm+1 connected to the battery cells B1 to Bm are divided into s (where s is an integer equal to or greater than 2) sets each having two or more second terminals connected to each other. may have been
  • each of the s-tuples is connected to a DC-stable node such as GND.
  • a wiring (for example, 3) may be provided.
  • the voltage measurement device 100b When measuring the voltage of the (m+1)-th battery cell Bm+1, the voltage measurement device 100b measures the voltage between the second terminal of the m+2-th resistance element Rm+2 and the second terminal of the resistance element 12. to measure. That is, the voltage measuring device 100b does not use the m+1-th resistance element Rm+1 when measuring the voltage of the (m+1)-th battery cell Bm+1. Voltage measuring device 100b measures the voltage of the battery cell using the second terminal of the resistive element connected through capacitor 21 to a common DC stable node.
  • the voltage measurement device 100b turns off the m+1-th first switch, and turns off the m+1-th second switch and the m+2-th switch. Turn ON.
  • the m+1-th first switch is a switch to which the resistance element Rm+1 is connected via the input terminal Sm+1
  • the m+1-th second switch is connected to the resistance element 12 via the input terminal Ssplit.
  • the m+2th switch is a switch to which the resistance element Rm+2 is connected through the input terminal Sm+2.
  • the first terminal is connected to the positive electrode of the m-th battery cell Bm (m is an integer equal to or greater than 1 and less than k) among the plurality of battery cells B1 and the like. and a capacitor 22 (an example of a third capacitor) whose first terminal is connected to the second terminal of the resistor 12 .
  • a second terminal of the resistance element 12 is connected to the voltage measuring unit 30, a second terminal of the capacitor 22 is connected to the positive electrode of the k-th battery cell Bk, and among the plurality of battery cells B1 and the like,
  • the second terminals of two or more capacitors C1 to Cm+1 among the capacitors C1 to Cm+1 connected to the m-th battery cells B1 to Bm are connected to each other, and the plurality of capacitors C1, etc.
  • the two or more capacitors among the first capacitors in are connected to the (m+1)th to nth battery cells including the kth battery cell Bk among the plurality of battery cells B1, etc. and capacitors Cm+2 to Cn+1.
  • the maximum value of the potential difference generated in the capacitor will be one of the sixth total voltage, the seventh total voltage, and the eighth total voltage.
  • each of the sixth total voltage, the seventh total voltage, and the eighth total voltage is applied to the highest battery cell Bn when each of the plurality of capacitors C1 and the like is connected to GND. It can be less than half the potential difference developed across the connected capacitors. Therefore, the voltage measuring device 100b can further reduce the withstand voltage characteristics required for the capacitors connected to the battery cells. This contributes to further reducing the cost of parts in the voltage measuring device 100b.
  • the voltage measurement device 100b measures the second voltage of the m+2-th resistance element Rm+2 (an example of the first resistance element) among the plurality of resistance elements R1 and the like. terminal and the second terminal of the resistive element 12 is measured.
  • the voltage of the battery cell Bm+1 can be measured more accurately because the voltage can be measured using the second terminal of the resistive element to which the capacitor having the same potential as the second terminal is connected. can be done.
  • the second terminals of the capacitors C1 to Cm+1 connected to the battery cells B1 to Bm are connected to each other, and the m-th battery cell Bm is n/3 of the plurality of battery cells B1 and the like.
  • the k-th battery cell Bk is the 2n/3th battery cell among the plurality of battery cells B1 and the like.
  • the maximum value of the potential difference generated in the capacitor is 1 ⁇ 3 of the potential difference generated in the capacitor connected to the highest battery cell Bn when each of the plurality of capacitors C1 and the like is connected to GND. can do. That is, the withstand voltage of the capacitor can be reduced to about 1/3. Therefore, the voltage measuring device 100b can further reduce the withstand voltage characteristics required for the capacitors connected to the battery cells. This contributes to a further reduction in component costs in the voltage measuring device 100b.
  • the second terminals of the capacitors C1 to Cm connected to the battery cells B1 to Bm are divided into s (s is an integer equal to or greater than 2) groups in which two or more second terminals are connected to each other.
  • the s sets include those in which the second terminals of two or more of the capacitors C1 to Cm+1 connected to the battery cells B1 to Bm are connected to each other.
  • the withstand voltage characteristics required for the capacitors connected to the battery cells can be further lowered.
  • FIG. 4 is a block diagram showing the configuration of an assembled battery system 1c according to this modification. In addition, below, it demonstrates centering around difference with Embodiment 2, and abbreviate
  • FIG. A voltage measuring device 100c according to this modification differs from the voltage measuring unit 30 of the voltage measuring device 100b according to the second embodiment in the configuration of the voltage measuring unit 30c.
  • the voltage measurement section 30c has a first switch section 31c1, a second switch section 31c2, a third switch section 31c3, and a plurality of AD converters 32.
  • Each of the first switch section 31c1, the second switch section 31c2 and the third switch section 31c3 is implemented by, for example, a multiplexer having a plurality of switches.
  • the first switch section 31c1 is a switch section for measuring the voltages of the battery cells Bk+1 to Bn
  • the second switch section 31c2 is a switch section for measuring the voltages of the battery cells Bm+1 to Bk-1.
  • a third switch section 31c3 is a switch section for measuring the voltages of the battery cells B1 to Bm.
  • the AD converter 32 is connected to each of the first switch section 31c1, the second switch section 31c2, and the third switch section 31c3.
  • the number of switch units and the number of AD converters are not limited to the numbers shown in FIG. 4, and are not particularly limited as long as they are two or more. In addition, it is possible to arbitrarily set which battery cell is measured by which set of switch section and AD converter.
  • two or more multiplexers and two or more AD converters are used to measure the voltages of a plurality of battery cells B1 and the like.
  • FIG. 5 is a block diagram showing the configuration of an assembled battery system 1d according to this modification. In addition, below, it demonstrates centering around difference with Embodiment 2, and abbreviate
  • FIG. A voltage measuring device 100d according to this modification differs from the voltage measuring unit 30 of the voltage measuring device 100b according to the second embodiment in the configuration of a voltage measuring unit 30d.
  • the voltage measurement section 30d has a plurality of AD converters 32.
  • the battery cells and AD converters 32 are provided in one-to-one correspondence. That is, n AD converters 32 (the same number as the battery cells) are provided.
  • One ADC 32 is arranged for the input terminals Sm+2 and Ssplit.
  • the voltage between the second terminal of the m+1-th resistor element Rm+1 and the second terminal of the m-th resistor element Rm is measured.
  • One ADC 32 is arranged for the input terminals Sm+1 and Sm.
  • the voltage measurement section 30d does not have a switch section (for example, a multiplexer).
  • the voltage measurement section 30d can realize its function without having a switch section, so that the configuration of the voltage measurement section 30d can be simplified. This can contribute to cost reduction of the voltage measuring device 100d.
  • one assembled battery system is used, but at least one of the positive electrode of the highest battery cell and the negative electrode of the lowest battery cell is used in another assembled battery system. It may be connected to a battery cell. Also, the negative electrode of the lowest battery cell may be connected to GND.
  • each component of the voltage measuring device described in the above embodiments and the like may be realized as software, or typically as an LSI, which is an integrated circuit. These may be made into one chip individually, or may be made into one chip so as to include part or all of them. Although LSI is used here, it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration. Also, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit (general-purpose circuit that executes a dedicated program) or a general-purpose processor.
  • An FPGA Field Programmable Gate Array
  • a reconfigurable processor that can reconfigure the connections or settings of the circuit cells inside the LSI may be used. Furthermore, if an integrated circuit technology that replaces the LSI appears due to advances in semiconductor technology or another derived technology, the components may naturally be integrated using that technology.
  • the present disclosure is useful, for example, as an in-vehicle voltage measuring device and assembled battery system.

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  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
PCT/JP2022/034446 2021-09-15 2022-09-14 電圧測定装置及び組電池システム Ceased WO2023042860A1 (ja)

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CN202280061559.8A CN117940779A (zh) 2021-09-15 2022-09-14 电压测定装置及电池组系统
JP2023548488A JPWO2023042860A1 (https=) 2021-09-15 2022-09-14
EP22870007.6A EP4403929B1 (en) 2021-09-15 2022-09-14 Voltage measurement device and battery pack system
US18/602,691 US20240222820A1 (en) 2021-09-15 2024-03-12 Voltage measurement device and cell stack system

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US63/244,598 2021-09-15

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CN116981948A (zh) 2023-10-31
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EP4403929A1 (en) 2024-07-24
US20240222820A1 (en) 2024-07-04
JPWO2023042860A1 (https=) 2023-03-23
CN116940851A (zh) 2023-10-24
CN117940779A (zh) 2024-04-26
CN116917752A (zh) 2023-10-20

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