WO2005109600A1 - Systeme pour surveiller la tension d'un element de batterie d'une connexion en serie d'elements de batterie - Google Patents

Systeme pour surveiller la tension d'un element de batterie d'une connexion en serie d'elements de batterie Download PDF

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Publication number
WO2005109600A1
WO2005109600A1 PCT/EP2005/005312 EP2005005312W WO2005109600A1 WO 2005109600 A1 WO2005109600 A1 WO 2005109600A1 EP 2005005312 W EP2005005312 W EP 2005005312W WO 2005109600 A1 WO2005109600 A1 WO 2005109600A1
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WO
WIPO (PCT)
Prior art keywords
voltage
charge storage
cell
storage means
control unit
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/EP2005/005312
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English (en)
Inventor
James Mccorley
Michael Bailey
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.)
ARBARR ELECTRONICS Ltd
Original Assignee
ARBARR ELECTRONICS Ltd
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Filing date
Publication date
Application filed by ARBARR ELECTRONICS Ltd filed Critical ARBARR ELECTRONICS Ltd
Publication of WO2005109600A1 publication Critical patent/WO2005109600A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
    • H02J7/52—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially for charge balancing, e.g. equalisation of charge between batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
    • H02J7/82—Control of state of charge [SOC]

Definitions

  • the present invention relates to a voltage monitoring system and in paiticular to a Protection Circuit Module (PCM) for a battery pack.
  • PCM Protection Circuit Module
  • PCM Protection Circuit Module
  • a primary function of the PCM is to monitor the voltage across the, or each, cell of the battery pack and to isolate the battery pack from a load, or from a battery charger, if the measured voltage is outside predetermined limits.
  • the PCM may be required to measure cell voltages with a relatively high degree of accuracy, for example within a tolerance limit of approximately 0.5 to 1%. Such accuracy can be difficult to achieve especially where the PCM comprises a control unit and the supply, or rail, voltage of the control unit is similar to the 0 individual cell voltage of the battery pack but significantly less than the total battery voltage.
  • PCM Complementary Metal-Oxide-Coupled Device
  • a first aspect of the invention provides a protection circuit module (PCM) for a battery comprising at least one battery cell, the PCM comprising means for measuring a voltage signal; means for storing electrical charge; and means for selectably connecting the charge storage means across said at least one battery cell such that the charge storage means is charged according to the voltage across said at least one barter ⁇ ' cell, or to the voltage measuring means such that the voltage of the charge storage means can be measured.
  • PCM protection circuit module
  • the charge storing means When com ected across a cell, the charge storing means is charged by an amount depending on the potential difference across the cell. When connected to the voltage measuring means, the voltage across the charge storage means can be measured and used as an indication of the voltage of or across the cell.
  • the charge storage means comprises at least one capacitor.
  • the charge storage means is connectable across each of a plurality of battery cells in turn, the connecting means being arranged to cause the charge storage means to be connected alternately across one of said battery cells and then to the voltage measuring means, the voltage measuring means being arranged to measure, in turn, the voltage created by the respective stored charge imparted to the charge storage means by each battery cell.
  • the system further includes a control unit, the control umt including said voltage measuring means.
  • said voltage measuring means may be arranged to compare the voltage of the charge storage means with a first reference voltage.
  • said first reference voltage comprises a supply voltage to the control unit, the control unit being arranged to calibrate said first reference voltage against a second reference voltage.
  • the second reference voltage may be provided by a diode, for example a reference diode such as a zener diode.
  • the calibration may be performed occasionally, periodically or before each measurement cycle.
  • the control unit is arranged to switch on the reference diode only when the supply voltage is to be calibrated.
  • the voltage measuring means includes an Analogue-to-Digital converter (ADC) arranged to receive the voltage of the charge storage means and to receive said first reference voltage as a reference signal.
  • ADC Analogue-to-Digital converter
  • the connecting means may include at least one switching mechanism operable by the control unit.
  • control unit comprises a programmable microprocessor, microcontroller or other data processor.
  • the PCM includes means for isolating the battery from a load depending on the voltage of the charge storage means measured in respect of one or more of said at least one battery cells and/or means for isolating said battery from a charger depending on the voltage of the charge storage means measured in respect of one or more of said at least one battery cells.
  • the PCM may include at least one load that is connectable across said at least one battery cell, and means for selectably connecting the at least one load across said at least one battery cell depending on the voltage of the charge storage means measured in respect of the at least one battery cell.
  • the PCM may include at least one load in series with a diode, the at least one load and diode being connected across said at least one battery cell, such that the load draws current from the at least one battery cell when the voltage of the cell exceeds the diode voltage.
  • a second aspect of the invention provides a battery pack comprising a battery having at least one cell, and the PCM of the first aspect of the invention.
  • a third aspect of the invention comprises a control unit having an input associated with an analogue-to-digital-converter (ADC), the control unit being arranged to receive a supply voltage, wherein the supply voltage provides a reference signal for the ADC and the control unit calibrates the received supply voltage against a supply voltage reference signal.
  • ADC analogue-to-digital-converter
  • a fourth aspect of the invention provides a voltage monitoring system comprising means for measuring a voltage signal; means for storing electrical charge; and means for selectably connecting the charge storage means across at least one target component such that the charge storage means is charged according to the voltage across said at least one target component, or to the voltage measuring means such that the voltage of the charge storage means can be measured.
  • voltage may be measured directly or indirectly. Indirect measurement may, for example, be achieved by measuring current or other voltage derivative.
  • Indirect measurement may, for example, be achieved by measuring current or other voltage derivative.
  • FIG. 1 presents a block diagram of a voltage monitoring system in the form of a Protection Circuit Module (PCM) embodying the present invention, and a battery pack.
  • PCM Protection Circuit Module
  • the system 10 is shown coupled to a battery, or battery pack 12.
  • the battery 12 comprises a plurality of cells 14 (6 cells are shown for illustration purposes only) electrically connected in series.
  • the battery 12 is a rechargeable battery pack and has positive and negative terminals 16, 18 by which the battery pack 12 may, in a discharging mode of operation, supply electrical power to a load (not shown) or may, in a charging mode of operation, be charged or recharged by a battery charger (not shown).
  • the battery 12 may employ any one of a variety of conventional chemical technologies, for example Lithium-Ion (Li- Ion) technology.
  • battery 12 may comprise a Li-ion phosphate battery.
  • the PCM 10 comprises a control unit 20, typically comprising a programmed, embedded microcontroller or other data processor, which receives (at input Ndd) a supply, or rail, voltage from the battery 12 via a voltage regulator 27.
  • the control unit 20 is required to be of a type that consumes relatively little electrical power during use and hence its supply voltage is relatively low.
  • the control unit 20 may comprise a PIC 18F 1220 IC microcontroller as provided by Microchip Technology Inc (www . microchip . com) which requires a nominal 5 volt supply voltage.
  • the voltage regulator 27, which may be a micro-power voltage regulator, delivers the supply voltage to the control unit 20 within product dependent tolerance limits, typically in the order of approximately 5%.
  • the PCM 10 is particularly suited for use in applications where the cell voltage, that is the potential difference across each cell 14 when fully charged to normal capacity, is less than but in the order of, or similar to, the control unit 20 supply voltage.
  • the cell voltage is assumed to be approximately 4 volts.
  • the overall battery voltage which is approximately 24 volts in the illustrated example, is significantly higher than the control unit supply voltage.
  • the system 10 further comprises an electrical charge storage device in the form of a capacitor 24 which is connectable across each cell 14 individually by means of a first switching device 26.
  • the switching device 26 may take the form of a multiplexer arranged to comiect, in a first switching state, the respective positive and negative terminals of one cell 14 at a time across the capacitor 24 so that the capacitor 24 may be charged by an amount depending on the potential difference across the respective cell 14.
  • the switching device 26 may also adopt a second switching state in which the capacitor 24 is electrically isolated from each of the cells 14 (as illustrated in the drawing).
  • the switch control input (not shown) of the multiplexer 26 is conveniently provided by the control unit 20.
  • the switching device 26 may alternatively take the form of respective individual switches for each cell 14.
  • a second switching device 28 is arranged to selectably connect the capacitor 24 between an input 30 to the control unit 20 and a reference potential, conveniently electrical ground GND.
  • the first switching device 26 connects the capacitor 24 across any one of the cells 14, and the second switching device 28 is open to isolate the capacitor 24 from input 30 and from ground GND. Hence, the capacitor 24 is charged by an amount depending on the potential difference across said cell 14.
  • the first switching device isolates the capacitor 24 from the cells 14 and the second switching device 28 connects the capacitor 14 between input 30 and ground GND.
  • control unit 20 provides means for measuring a voltage signal, in particular the voltage created by the charged stored on the capacitor 24.
  • a voltage signal in particular the voltage created by the charged stored on the capacitor 24.
  • the charge which is stored by, or more specifically the voltage across, the capacitor 24 may be measured by the control unit 20 using the signal at input 30 (with respect to ground in this example).
  • the control unit 20 may be configured to control the switching of both the first and the second switching devices 26, 28 so that the capacitor 24 is charged by each cell 14 in turn and, after each charge, the stored charge on, or voltage across, the capacitor 24 is measured by the control unit 20. Hence, the control unit 20 is able to measure, indirectly and in turn, the potential difference across each cell 14.
  • the first and second switching devices 26, 28 and the capacitor 24 may be said to comprise a flying capacitor circuit.
  • the capacitor 24, which may be referred to as a flying capacitor may, for example, comprise a ceramic storage capacitor and, in the present example, may have a capacitance of approximately 33nF.
  • the input 30 is associated with an analogue-to-digital converter (ADC) (not shown) provided internally of the microprocessor 20.
  • ADC analogue-to-digital converter
  • the ADC receives an analogue signal via input 30 corresponding to the charge stored on the capacitor 24 and converts the analogue signal into a digital signal which may be processed by the microprocessor 20.
  • the ADC is provided with a reference signal, usually in the form of a reference voltage, against which the received analogue signal may be measured or calibrated.
  • the reference voltage for the ADC may comprise the voltage (or a derivative thereof) across a reference diode.
  • such a reference diode is provided externally of the controller 20 and, during operation of the system 10, is biased (for example by a voltage applied by an output of the control unit 20 or by the control unit supply voltage) so that a relatively precise voltage is developed across the diode.
  • the diode voltage (or derivative) is provided to an input of the control unit 20 for use as an ADC reference voltage.
  • the reference voltage provided by the diode is usually significantly less that the control unit supply voltage and this limits the sensitivity of the ADC.
  • the ADC supply voltage itself (which in the present example may be nominally 5 volts) may be used as the ADC reference voltage.
  • the control unit supply voltage may not be sufficiently accurate for certain applications.
  • the control unit supply voltage Vdd provides the ADC reference signal and is calibrated, preferably periodically, by the control unit 20, against a second reference signal.
  • the second reference signal conveniently comprises the voltage (or a derivative thereof) developed across a reference diode, the diode being such that the diode voltage, when turned on, or biased, falls within relatively precise tolerance limits, for example less than 1%.
  • a typical reference diode voltage is accurate to within approximately 0.2%.
  • a reference diode 32 is included in system 10 and the diode voltage is supplied to an input 34 (which is typically associated with a ADC (not shown)) of the control unit 20. The diode 32 may be turned on, or biased, by application of a voltage under the control of the control unit 20.
  • control unit 20 may apply a voltage to diode via an output 36 (and typically via a current limiting resistor 38).
  • the diode voltage is less than the control unit supply voltage (for example 2.5. volts) and may be used to calibrate the control unit supply voltage Vdd as is now described.
  • the diode 32 is normally switched off (so that it consumes no power) but, during use of the system 10, is occasionally or periodically switched on by application of a biasing voltage by the control unit 20.
  • the control unit 20 measures the diode reference voltage at input 34 and compares the diode reference voltage against the control umt supply voltage received at input Ndd.
  • the control unit 20 may thus determine a relatively accurate value for the supply voltage received at Vdd at the time of measurement.
  • the control unit 20 may thus make a relatively accurate measurement of the signal received by the ADC at input 30 using the determined value of the supply voltage as a reference.
  • the supply voltage is used as a reference for the ADC as opposed to a smaller reference voltage provided by, say, an external reference diode, the sensitivity, or dynamic range, of the ADC is increased and this too contributes to the accuracy of the measurement of the signal received at input 30.
  • the control unit 20 may, for example, switch on the reference diode 32 for a brief period before each cell voltage measurement, or each round of cell voltage measurements (a round being one cycle of measuring each cell voltage), after which the diode 32 is switched off to minimise power consumption.
  • the control unit 12 in order to preserve power, enters a low-power "sleep" mode after each measurement cycle and "wakes" itself after a pre-determined period in order to perform a further measurement cycle.
  • the system 10 may include one or more switches 44 operable, conveniently by the control unit 20, to isolate the battery 12 from a load (not shown), when in discharge mode, or from a charger (not shown)when in charging mode.
  • switches 44a, 44b are provided in series with the battery 12 and are operable by the control unit 20 via outputs 46, 48 respectively.
  • Each switch 44 may for example comprise a respective power MOSFET (Metal
  • Each MOSFET has an internal "bypass" diode which ensures that it allows current to pass when biased, or connected, the wrong way around (reverse or wrong polarity).
  • a MOSFET comprising a Schottky bypass diode may be used. As a result, less voltage is lost and hence less power is dissipated in this mode of operation.
  • either or both MOSFET's are turned 'on' or 'off by applying suitable gate voltages. Since a MOSFET gate voltage is referenced to its source terminal, a level changing circuit 50 is associated with the gate input for one of the switches 44a.
  • both switches 44 are turned 'on': this the normal operational mode.
  • a MOSFET appears (electrically) like a low resistance, the "on resistance” being typically 20m ⁇ in both directions (either polarity connection).
  • a MOSFET appears (electrically) like a very high resistance, typically greater than 1M ⁇ , when comiected, or biased, with proper polarity, or looks like a semiconductor diode (e.g. a Schottky diode in the present example) when comiected, or biased, with reverse polarity.
  • a semiconductor diode e.g. a Schottky diode in the present example
  • resistor 40 may be provided by the implicit "on resistance" of the MOSFET, thus saving an low- ohmic value and a relatively expensive (explicit) resistor.
  • the controller 20 detects the voltage drop across resistor 40 via input 42 and, depending on the detected value, may take appropriate action (e.g. turning the switch 44b off via output 48).
  • a hardware comparator and latching circuit (not shown) may be provided to perform this function, since such hardware acts more quickly as may be required to protect the battery.
  • the control unit 20 periodically (for example several times per second) causes the capacitor 24 to be charged, in turn, by the potential difference across each cell 14. After each charge, the control unit 20 measures, in the manner described above, the charge stored by the capacitor 24, the measured charge being indicative of the potential difference across the respective cell 14. Should the measured charge of any cell 14 exceed a first, or charge, threshold (when the battery 12 is being charged), then the control unit 20 isolates the batter ⁇ ' 12 from the charger. Should the measured charge of any cell 14 drop below a second, or discharge, threshold (when the batter ⁇ ' 12 is supplying a load), then the control unit 20 isolates the battery 12 from the load. The control unit 20 may decide to isolate the battery 12 based on a measurement from a single measurement cycle, or may alternatively make a decision based on average measurements taken over several cycles.
  • a flying capacitor 24 allows the individual cell voltages to be measured to a relatively high level of accuracy without the need for potential divider circuits and high precision resistors (which are undesirable as they add significantly to the cost of the system). It is preferred to use only one storage capacitor 24, although more capacitors may be used if desired. Alternatively, one or more other, conventional electrical energy, or charge, storage devices may be used in place of capacitor 24.
  • reference diode 32 as described above, the power requirements of the system 10 can be reduced while still maximising the dynamic range of the ADC. Hence, the required level of measurement accuracy can be obtained while using a relatively low precision ADC and while drawing relatively little power.
  • the PCM function optionally may facilitate "cell balancing" by inclusion of circuitry to deal with the tendency for one or more cells to become more charged than others such that capacity (measured between the first cell to have a voltage below the discharge tlireshold and the first cell to have a voltage above the charge threshold) is reduced. Differences between cells 14 may lead to differing charging rates and thus to different voltage against time relationships whilst charging.
  • the system 10 may employ a "passive-passive" cell balancing technique in which a reference diode, conveniently a zener diode (e.g. 3.9 volts zener diode) and load resistor (e.g.
  • active-passive cell balancing may be employed in which a respective load resistor (e.g. 100 ohms) is connectable across each cell 14 by means of a switch or respective switch (e.g. a semiconductor switch such as a bipolar or MOSFET transistor), the, or each, switch conveniently being controlled by the controller 20.
  • a respective load resistor e.g. 100 ohms
  • a switch or respective switch e.g. a semiconductor switch such as a bipolar or MOSFET transistor
  • the controller 20 which measures the cell voltages as described above, decides whether and when to connect the respect load across the respective cell 14 depending on the respective measured cell voltage, and/or on a recorded history of cell voltages in order to balance cell voltages.
  • Either cell balancing option increases the quiescent current of the system 10 and battery 12 combination when the battery 12 is well charged, although with active-passive balancing, the increase can be controlled.
  • the system 10 may optionally include current sense resistor 40 in series with the battery 12.
  • the voltage across resistor 40 (with respect to electrical ground or other reference) is, for example, supplied to an input 42 (typically associated with an ADC (not shown)) of the control unit 20, or may be measured by any other suitable means.
  • the control unit 20 may monitor the signal received at input 42 and therefore measure the current drawn from the batter ⁇ ' 12 when the battery is supplying a load. Depending on the measured current value, e.g. should the detected current exceed the charge tlireshold value during charging, then the control umt 20 may isolate the batter ⁇ ' 12 from the load by means of one or both of switches 44.
  • the system 10 is particularly, but not exclusively, suitable for use as a PCM and for measuring the potential differences across the cells of a battery.
  • the system may alternatively be used for monitoring the voltage across other target components, including networks,
  • the main embodiment described herein is particularly suited for use with batteries having between 2 and 7 (inclusive) cells, although the invention is not limited to this and may, more generally be used in applications where the battery comprises one or more cells.
  • the controller 20 comprises a microcontroller, or similar data processor, preferably having a re-programmable non- volatile memory, e.g. a flash memory, and supporting in-circuit programming.
  • the microcontroller, or other processor may for example be used to perform one or more of the following tasks: store a product model number and unique product serial number (or other unique identifier) which can be read using a suitable tool via, for example, the processor's serial in-circuit programming port (not shown); store cell chemistry parameters including over-charge and under-charge threshold voltages, and time constants (e.g.
  • Some aspects of the invention are not limited to use in the context of a PCM or to the measurement of the voltage across the cells of a batteiy, as would be apparent to a skilled person, and may more generally be used in a voltage monitoring system for measuring the voltage across one or more target components. Moreover, the invention is not limited to the embodiments described herein which may be modified or varied without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un module circuit de protection destiné à une batterie d'accumulateurs comprenant au moins un élément de batterie. Le module circuit de protection préféré comprend un condensateur pouvant être connecté sélectivement aux bornes d'une pluralité d'éléments de batterie, ou à un dispositif de mesure de la tension. Lorsqu'on branche le condensateur aux bornes d'un élément de batterie, il se charge selon une valeur dépendant de la tension de l'élément. Lorsque le condensateur est connecté au dispositif de mesure de la tension, la tension du condensateur est mesurée et sert à indiquer la tension de l'élément de batterie.
PCT/EP2005/005312 2004-05-12 2005-05-12 Systeme pour surveiller la tension d'un element de batterie d'une connexion en serie d'elements de batterie Ceased WO2005109600A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0410531.8 2004-05-12
GBGB0410531.8A GB0410531D0 (en) 2004-05-12 2004-05-12 Voltage monitoring system

Publications (1)

Publication Number Publication Date
WO2005109600A1 true WO2005109600A1 (fr) 2005-11-17

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PCT/EP2005/005312 Ceased WO2005109600A1 (fr) 2004-05-12 2005-05-12 Systeme pour surveiller la tension d'un element de batterie d'une connexion en serie d'elements de batterie

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GB (1) GB0410531D0 (fr)
WO (1) WO2005109600A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102906581A (zh) * 2010-02-22 2013-01-30 株式会社Lg化学 电池单元平衡电路的异常诊断设备和方法
EP2104858A4 (fr) * 2007-01-07 2014-01-08 Enerdel Inc Système et procédé permettant de mesurer des tensions dans des cellules montées en série et de vérifier la précision des mesures
EP2122380A4 (fr) * 2007-01-07 2014-01-08 Enerdel Inc Procédé et système permettant de mesurer des tensions de cellules montées en série à l'aide d'un condensateur volant
EP2787592A4 (fr) * 2011-11-29 2015-07-22 Seiko Instr Inc Circuit de commande de charge et de décharge et dispositif à batterie
EP3540451A1 (fr) * 2018-03-14 2019-09-18 Mitsubishi Electric R&D Centre Europe B.V. Détection de tension
CN110832332A (zh) * 2017-12-14 2020-02-21 株式会社Lg化学 电压测量装置和方法
GB2610000A (en) * 2021-08-20 2023-02-22 Cirrus Logic Int Semiconductor Ltd Cell balancing

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EP0588613A2 (fr) * 1992-09-17 1994-03-23 Sony Corporation Circuits de protection de batterie
US5646534A (en) * 1995-01-06 1997-07-08 Chrysler Corporation Battery monitor for electric vehicles
EP0992811A2 (fr) * 1998-10-06 2000-04-12 Hitachi, Ltd. Appareil et méthode de commande pour batterie
US20020017895A1 (en) * 1999-12-20 2002-02-14 Nec Corporation Cell balance adjusting circuit, abnormal cell voltage detecting circuit, method of adjusting cell balance, and method of detecting abnormal cell voltage
WO2003088446A1 (fr) * 2002-04-16 2003-10-23 Sanyo Component Europe Gmbh Circuit de controle de charge pour un bloc-batterie constitue d'elements de batterie rechargeables

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US5180641A (en) * 1991-05-09 1993-01-19 Rockwell International Corporation Battery cell bypass circuit
EP0588613A2 (fr) * 1992-09-17 1994-03-23 Sony Corporation Circuits de protection de batterie
US5646534A (en) * 1995-01-06 1997-07-08 Chrysler Corporation Battery monitor for electric vehicles
EP0992811A2 (fr) * 1998-10-06 2000-04-12 Hitachi, Ltd. Appareil et méthode de commande pour batterie
US20020017895A1 (en) * 1999-12-20 2002-02-14 Nec Corporation Cell balance adjusting circuit, abnormal cell voltage detecting circuit, method of adjusting cell balance, and method of detecting abnormal cell voltage
WO2003088446A1 (fr) * 2002-04-16 2003-10-23 Sanyo Component Europe Gmbh Circuit de controle de charge pour un bloc-batterie constitue d'elements de batterie rechargeables

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2104858A4 (fr) * 2007-01-07 2014-01-08 Enerdel Inc Système et procédé permettant de mesurer des tensions dans des cellules montées en série et de vérifier la précision des mesures
EP2122380A4 (fr) * 2007-01-07 2014-01-08 Enerdel Inc Procédé et système permettant de mesurer des tensions de cellules montées en série à l'aide d'un condensateur volant
CN102906581A (zh) * 2010-02-22 2013-01-30 株式会社Lg化学 电池单元平衡电路的异常诊断设备和方法
EP2541265A4 (fr) * 2010-02-22 2013-08-21 Lg Chemical Ltd Dispositif et procédé de diagnostic d'anomalie de circuit d'équilibrage des éléments
US8643500B2 (en) 2010-02-22 2014-02-04 Lg Chem, Ltd. Apparatus and method for diagnosing abnormality in cell balancing circuit
CN102906581B (zh) * 2010-02-22 2015-04-29 株式会社Lg化学 电池单元平衡电路的异常诊断设备和方法
EP2787592A4 (fr) * 2011-11-29 2015-07-22 Seiko Instr Inc Circuit de commande de charge et de décharge et dispositif à batterie
CN110832332A (zh) * 2017-12-14 2020-02-21 株式会社Lg化学 电压测量装置和方法
EP3667343A4 (fr) * 2017-12-14 2020-10-21 Lg Chem, Ltd. Dispositif et procédé de mesure de tension
US11215669B2 (en) 2017-12-14 2022-01-04 Lg Chem, Ltd. Apparatus and method for measuring voltage
EP3540451A1 (fr) * 2018-03-14 2019-09-18 Mitsubishi Electric R&D Centre Europe B.V. Détection de tension
WO2019176365A1 (fr) * 2018-03-14 2019-09-19 Mitsubishi Electric Corporation Module à semi-conducteur de puissance et procédé de détection de tension de commutateur à semi-conducteur de puissance
GB2610000A (en) * 2021-08-20 2023-02-22 Cirrus Logic Int Semiconductor Ltd Cell balancing
GB2610000B (en) * 2021-08-20 2024-02-07 Cirrus Logic Int Semiconductor Ltd Cell balancing

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