WO2017155260A1 - Dispositif d'estimation de courant de charge/décharge - Google Patents

Dispositif d'estimation de courant de charge/décharge Download PDF

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Publication number
WO2017155260A1
WO2017155260A1 PCT/KR2017/002399 KR2017002399W WO2017155260A1 WO 2017155260 A1 WO2017155260 A1 WO 2017155260A1 KR 2017002399 W KR2017002399 W KR 2017002399W WO 2017155260 A1 WO2017155260 A1 WO 2017155260A1
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WO
WIPO (PCT)
Prior art keywords
current
node
capacitor
switch
resistor
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Ceased
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PCT/KR2017/002399
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English (en)
Korean (ko)
Inventor
박연도
길유섭
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LG Chem Ltd
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LG Chem Ltd
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Publication date
Priority claimed from KR1020170027932A external-priority patent/KR102014468B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Priority to US15/765,655 priority Critical patent/US10539623B2/en
Priority to EP17763521.6A priority patent/EP3351952B1/fr
Priority to PL17763521T priority patent/PL3351952T3/pl
Priority to JP2018529130A priority patent/JP6610912B2/ja
Priority to CN201780003644.8A priority patent/CN108139448B/zh
Publication of WO2017155260A1 publication Critical patent/WO2017155260A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
    • H01R11/28—End pieces consisting of a ferrule or sleeve
    • 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]
    • 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
    • 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
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a technique for estimating charge / discharge current of a battery pack, and more particularly, to a current estimating apparatus having immunity to noise.
  • the present invention claims priority to Korean Patent Application No. 10-2016-0027243, filed March 7, 2016 and Korean Patent Application No. 10-2017-0027932, filed March 3, 2017 The contents are incorporated in this application by reference.
  • водородн ⁇ е ⁇ е ⁇ ество Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density is high.
  • the secondary battery is mainly used in the form of a battery pack, and the battery pack includes various electronic devices such as BMS.
  • the battery pack includes various electronic devices such as BMS.
  • electronic devices may be exposed to external broadcast signals or various wireless communication signals, and may cause malfunctions by external broadcast signals or various wireless communication signals. Therefore, such electronic devices are required to withstand electromagnetic waves.
  • FIG. 1 is a view schematically showing a charge / discharge current measuring circuit of a battery pack according to the prior art.
  • the charge / discharge current of a battery pack is measured by measuring a voltage applied to a shunt resistor R s and amplifying it. That is, when the charge and discharge current and a potential difference in the shunt resistor (R s) for flowing the shunt resistor (R s) through them resulting from the amplification in the amplification section 50, and outputs it to ADC (Analog to Digital Converter, 60).
  • ADC 60 converts the amplified potential difference into a digital signal.
  • the calculating means 70 receives the changed digital signal and calculates the current flowing through the shunt resistor R s . At this time, the calculating means 70, the resistance value and the amplification gain of the shunt resistor (R s) may calculate the current flowing through the shunt resistor (R s) in consideration.
  • the skin effect affects the impedance of the shunt portion 40 to generate a potential difference in the shunt resistance R s .
  • the shunt resistor (R s) even if the large potential difference, even if a minute electric potential difference in the shunt resistor (R s) due to amplify it in the amplifier section 50, the charging and discharging current measuring circuit for generating the real to the shunt resistor (R s) It can be mistaken that a charge / discharge current different from that flows.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a current estimation device which prevents an error from occurring due to an unexpected high frequency signal.
  • An apparatus for estimating charge / discharge current of a battery pack includes: a shunt resistor connected between a first node and a second node on a charge / discharge path of a battery pack; A shunt capacitor connected between the first node and the second node; A voltage measurer connected between the first node and the second node to measure a voltage applied to the shunt resistor; And a current estimating unit estimating the charge / discharge current of the battery pack using the voltage measured by the voltage measuring unit.
  • the voltage measuring unit may further include a filter module; And an amplification module.
  • the filter module may include a first series arm having a first resistor and a first capacitor connected in series with the first resistor and connected to the first node; And a second series arm having a second resistor and a second capacitor connected in series with the second resistor and connected to the second node.
  • the amplifier module includes: an amplifier having an input terminal connected to a third node formed between the first resistor and the first capacitor and an input terminal connected to a fourth node formed between the second resistor and the second capacitor; It may include.
  • the bus bar may further include two bus bars.
  • One of the two busbars may connect one end of each of the shunt resistor and the shunt capacitor to the first node.
  • the other one of the two busbars may connect the other end of each of the shunt resistor and the shunt capacitor to the second node.
  • a first switch connected between the first capacitor and the third node;
  • a second switch connected between the second capacitor and the fourth node;
  • a switching controller configured to individually control an operation of the first switch and an operation of the second switch.
  • the current estimator may output a notification signal corresponding to the estimated magnitude of the charge / discharge current to the switching controller.
  • the switching controller may individually control operations of the first switch and the second switch based on the notification signal.
  • the current estimator may calculate a current average value of charge / discharge currents estimated a predetermined number of times for a predetermined time, and output a first notification signal when the current average value is smaller than a predetermined current threshold value.
  • the switching controller may turn on both the first switch and the second switch according to the first notification signal.
  • the current estimator may output a second notification signal when the current average value is greater than the current threshold value.
  • the switching controller may turn off both the first switch and the second switch according to the second notification signal.
  • a battery pack is provided.
  • the battery pack includes the current estimating device.
  • a motor vehicle is provided.
  • the automobile includes the current estimation device.
  • the present invention even when a high frequency signal is applied to the battery pack, it is possible to prevent a phenomenon in which the potential difference across the shunt resistor changes rapidly due to the high frequency signal. Therefore, according to the present invention, it is possible to prevent an error from occurring in the current estimate due to an unexpected high frequency signal.
  • FIG. 1 is a view schematically showing a charge / discharge current measuring circuit of a battery pack according to the prior art.
  • FIG. 2 is a diagram functionally showing the configuration of a current estimating apparatus according to an embodiment of the present invention.
  • FIG. 3 is a diagram showing the configuration of the current estimation device of FIG. 2 in more detail.
  • FIG. 4 is a view schematically showing the configuration of a shunt portion according to an embodiment of the present invention.
  • FIG. 5 is a view schematically showing the configuration of a shunt portion according to another embodiment of the present invention.
  • FIG. 6 is a diagram functionally showing the configuration of a current estimating apparatus according to another embodiment of the present invention.
  • FIG. 7 to 10 are diagrams referred to for explaining operations performed by the current estimating apparatus of FIG. 6.
  • 11A and 11B are graphs comparing the results of a radiation test (RI test) for the current estimating apparatus of FIG. 1 and the current estimating apparatus of FIG. 3, respectively.
  • RI test radiation test
  • control unit> means a unit for processing at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.
  • FIG. 2 is a diagram functionally showing the configuration of a current estimating apparatus according to an embodiment of the present invention.
  • the current estimating apparatus 2 is an apparatus for estimating the charge / discharge current of the battery pack 1 mounted on an automobile or the like, and includes a shunt unit 100, a voltage measuring unit 200, and a current estimating unit ( 300).
  • the battery pack 1 includes at least one battery 10.
  • the battery pack 1 and the load 20 are selectively connected by a relay 30.
  • the relay 30 When the relay 30 is turned on, the charge / discharge current flows, and when the relay 30 is turned off, the charge / discharge current is cut off.
  • the relay 30 When the relay 30 is turned on, current flows through the shunt resistor R s through the battery 10 and the load 20.
  • the shunt unit 100 includes a shunt resistor R s and a shunt capacitor C s .
  • the shunt capacitor C s is electrically connected in parallel with the shunt resistor R s .
  • the shunt resistor R s is connected between the first node N 1 and the second node N 2 formed on the charge / discharge path of the battery pack 1 and has a predetermined resistance value.
  • a current flows through the shunt resistor R s , a potential difference occurs.
  • the potential difference generated in the shunt resistor R s is measured by the voltage measuring unit 200 described later, and the current estimating unit 300 is used to estimate the charge / discharge current.
  • the shunt capacitor C s is connected between the first node N 1 and the second node N 2 and has a predetermined capacitance.
  • the shunt capacitor C s serves to prevent the potential difference from occurring in the shunt resistor R s by a high frequency component applied from the outside.
  • the capacitance of the shunt capacitor C s may be substantially the same as 15 pF.
  • the capacitance of the shunt capacitor C s may be optimized to block noise above a predetermined frequency (eg, 1.4 GHz).
  • the voltage measuring unit 200 is connected between the first node N 1 and the second node N 2 .
  • the voltage measuring unit 200 is connected between the first node N 1 and the second node N 2 to measure the voltage applied to the shunt resistor R s .
  • the voltage measuring unit 200 outputs the measured voltage to the current estimating unit 300 to be described later.
  • the current estimator 300 estimates the charge / discharge current of the battery pack 1 using the voltage measured by the voltage measurer 200.
  • the current estimator 300 may estimate the charge / discharge current for each predetermined time period based on the magnitude and the sign of the voltage measured by the voltage measurer 200.
  • the current estimator 300 may estimate the charge / discharge current by dividing the voltage measured by the voltage measurer 200 by the resistance value of the shunt resistor R s .
  • the current estimator 300 may include a calculation unit and may be implemented as part of an IC or a microprocessor.
  • FIG. 3 is a diagram showing the configuration of the current estimation device of FIG. 2 in more detail.
  • the same components as those shown in FIG. 2 are given the same reference numerals, and repeated description thereof will be omitted.
  • the voltage measuring unit 200 includes a filter module 210 and an amplification module 220.
  • the filter module 210 and the amplification module 220 are cascaded in the order of the shunt unit 100, the filter module 210, and the amplification module 220.
  • the third node N 3 is a node positioned between the first resistor R 1 and the input terminal I 1
  • the fourth node N 4 is a second resistor R 2 and the input terminal I 2. Nodes located between).
  • the filter module 210 includes a first serial arm S 1 and a second serial arm S 2 .
  • the first series arm S 1 includes a first resistor R 1 and a first capacitor C 1 .
  • the first resistor R 1 and the first capacitor C 1 may be connected in series with each other.
  • one end and the other end of the first resistor R 1 are connected to the first node N 1 and the input terminal I 1 , respectively.
  • One end and the other end of the first capacitor C 1 are connected to the third node N 3 and the ground, respectively.
  • the first resistor R 1 and the first capacitor C 1 operate as a first low pass filter.
  • the second series arm S 2 includes a second resistor R 2 and a second capacitor C 2 .
  • the second resistor R 2 and the second capacitor C 2 may be connected in series with each other.
  • one end and the other end of the second resistor R 2 are connected to the second node N 2 and the input terminal I 2 , respectively.
  • One end and the other end of the second capacitor C 2 are connected to the fourth node N 4 and the ground, respectively.
  • the second resistor R 2 and the second capacitor C 2 operate as a second low pass filter.
  • the amplification module 220 may include an amplifier A having two input terminals I 1 and I 2 and one output terminal O. Two input terminals I 1 and I 2 of the amplification module 220 are connected to a third node N 3 and a fourth node N 4 , respectively.
  • the output terminal O is connected to the current estimator 300.
  • the amplifier A has a predetermined amplification ratio G.
  • the current estimator 300 to be described later may estimate the charge / discharge current in consideration of the amplification ratio G.
  • the shunt portion 100 including the shunt resistor R s and the shunt capacitor C s will be described with respect to the shunt portion 100 viewed from a mechanical point of view.
  • the shunt portion 100 is configured to be connected to the first node N 1 and the second node N 2 described above, respectively.
  • the first node N 1 and the second node N 2 may be implemented in the form of a connector.
  • the shunt resistor R s and the shunt capacitor C s are electrically connected in parallel to form the shunt portion 100.
  • FIG. 4 is a view schematically showing the configuration of a shunt portion according to an embodiment of the present invention.
  • the shunt unit 100 includes two bus bars B 1 and B 2 , a resistance element R s , and a capacitor element C s .
  • the resistance element R s and the capacitor element C s are stacked in a plate shape, and two bus bars B 1 and B 2 are formed at both ends of the resistance element R s and the capacitor element C s . Is provided.
  • the two bus bars B 1 and B 2 may be electrically connected to the first node N 1 and the second node N 2, respectively, by soldering or welding.
  • the resistance element serves as a shunt resistor R s of the shunt portion 100, and the capacitor element shunts the shunt portion 100. It acts as a capacitor (C s ).
  • FIG 5 is a view schematically showing the configuration of the shunt portion 100 according to another embodiment of the present invention.
  • the shunt unit 100 includes a PCB plate 110, a resistance element R s , and two bus bars B 1 and B 2 .
  • the PCB plate 110 is plate-shaped, it is composed of an insulating material.
  • Metal foils 110a and 110b are coated on at least a portion of both surfaces of the PCB plate 110. As shown in FIG. 5, the metal foil 110b may be coated on the entire lower surface of the PCB plate 110, and the metal foil 110a may be coated on a portion of the upper surface of the PCB plate 110.
  • the resistance element R s is seated on a portion of the upper surface where the metal foil is not coated.
  • the two bus bars B 1 and B 2 contact the resistance element R s while being spaced apart from each other.
  • the two bus bars B 1 and B 2 may be electrically connected to the first node N 1 and the second node N 2, respectively, by soldering or welding.
  • the resistance element serves as a shunt resistor R s of the shunt portion 100
  • the PCB plate 110 is a shunt portion 100. It acts as a shunt capacitor (C s ).
  • the PCB plate 110 has a thickness d and an area s. The capacitance by the PCB plate 110 is determined by the following equation.
  • Cs is the capacitance of the shunt capacitor
  • ⁇ is the permittivity of the PCB plate
  • s is the area of the PCB plate
  • d is the thickness of the PCB plate.
  • FIG. 6 is a diagram functionally showing a configuration of a current estimating apparatus according to another embodiment of the present invention
  • FIGS. 7 to 10 are views referred to for explaining operations performed by the current estimating apparatus of FIG. .
  • the current estimating apparatus 2 of FIG. 6 includes a first switch SW1, a second switch SW2, a third capacitor C 3 , a fourth capacitor C 4 , and a switching controller 400. Is different in that it further includes).
  • the third capacitor C 3 and the fourth capacitor C 4 may be omitted from the current estimating apparatus 2 of FIG. 6.
  • the same reference numerals are assigned to the previously described components, and repeated description thereof will be omitted.
  • the capacitances of each of the first capacitor C 1 and the third capacitor C 3 are the same, and the capacitance of each of the second capacitor C 2 and the fourth capacitor C 4 is the same. Assume that
  • the first switch SW1 is connected in series with the first capacitor C 1 between the third node N 3 and the ground.
  • the third capacitor C 3 may be connected between the third node N 3 and the ground. While the first switch SW1 is turned on, the first capacitor C 1 is electrically connected to the third node N 3 . On the other hand, while the first switch SW1 is turned off, the first capacitor C 1 is electrically disconnected from the third node N 3 . While the first switch SW1 is turned on, the first capacitor C 1 and the third capacitor C 3 are electrically connected in parallel.
  • the second switch SW2 is connected in series with the second capacitor C 2 between the fourth node N 4 and the ground.
  • the fourth capacitor C 4 may be connected between the fourth node N 4 and the ground. While the second switch SW2 is turned on, the second capacitor C 2 is electrically connected to the fourth node N 4 . On the other hand, while the second switch SW2 is turned off, the second capacitor C 2 is electrically disconnected from the fourth node N 4 . While the second switch SW2 is turned on, the second capacitor C 2 and the fourth capacitor C 4 are electrically connected in parallel.
  • the second switch (SW2) is turned off while in the second switch (SW2) is turned on It can be twice the capacitance of. It is assumed that the resistance value of the second switch SW2 is so small that it can be ignored.
  • the switching controller 400 outputs control signals for individually controlling the operations of the first switch SW1 and the second switch SW2. In addition, the switching controller 400 may output a control signal for controlling the operation of the relay 30.
  • the switching controller 400 is communicatively connected to the current estimator 300.
  • the current estimator 300 outputs notification signals related to the estimated charge / discharge current to the switching controller 400.
  • the switching controller 400 may selectively output at least one of the following first control signal, second control signal, and third control signal based on the notification signal transmitted by the current estimator 300.
  • the switching controller 400 selectively stops the output of at least one of the following first control signal, second control signal, and third control signal based on the notification signal transmitted by the current estimator 300. can do.
  • the switching controller 400 is connected to the first switch SW1 through a first electric line, and the first control signal from the switching controller 400 is transmitted to the first switch SW1 through the first electric line.
  • the switching controller 400 When the switching controller 400 outputs the first control signal, the first switch SW1 is turned on in response to the first control signal. On the other hand, when the switching controller 400 stops outputting the first control signal, the first switch SW1 is turned off.
  • the switching controller 400 is connected to the second switch SW2 through a second electrical line, and the second control signal from the switching controller 400 is transmitted to the second switch SW2 through the second electrical line.
  • the switching controller 400 When the switching controller 400 outputs the second control signal, the second switch SW2 is turned on in response to the second control signal. On the other hand, when the switching controller 400 stops outputting the second control signal, the second switch SW2 is turned off.
  • the switching controller 400 is connected to the relay 30 through a third electric line, and the third control signal from the switching controller 400 is transmitted to the relay 30 through the third electric line.
  • the relay 30 When the switching controller 400 outputs the third control signal, the relay 30 is turned on in response to the third control signal. On the other hand, when the switching controller 400 stops outputting the third control signal, the relay 30 is turned off.
  • the current threshold value is a criterion for determining whether overcurrent occurs. That is, the current estimator 300 may determine that an overcurrent has not occurred when the average current value is less than the current threshold value, and may determine that an overcurrent has occurred in other cases.
  • the first capacitor C 1 and the second capacitor C 2 are electrically connected to the third node N 3 and the fourth node N 4 , respectively. Let's assume that it stays at. In this case, when the voltage corresponding to the charge / discharge current flowing through the load 20 is measured by the voltage measuring unit 200 due to the capacitance of each of the first capacitor C 1 and the second capacitor C 2 . There is no choice but to delay time. As a result, rapid estimation of charge and discharge current is difficult.
  • the current estimating apparatus of FIG. 6 selectively connects the first capacitor C 1 to the third node N 3 using the first switch SW1, and the second capacitor using the second switch SW2.
  • the current estimator 300 may compare the current average value with the current threshold value.
  • the notification signal output by the current estimator 300 may correspond to a comparison result between the current average value and the current threshold value.
  • the current estimator 300 may transmit the first notification signal to the switching controller 400.
  • the current estimator 300 may transmit the second notification signal to the switching controller 400.
  • the current estimator 300 may transmit the third notification signal to the switching controller 400.
  • the current estimator 300 may transmit the fourth notification signal to the switching controller 400.
  • FIG. 7 illustrates an operation when the switching controller 400 receives the first notification signal from the current estimator 300.
  • the switching controller 400 outputs a first control signal and a second control signal in response to the first notification signal.
  • both the first switch SW1 and the second switch SW2 are turned on so that the first capacitor C 1 and the second capacitor C 2 are respectively the third node N 3 and the fourth node. Is electrically connected to (N 4 ).
  • the first capacitor C 1 and the third capacitor C 3 are electrically connected in parallel
  • the second capacitor C 2 and the fourth capacitor C 4 are electrically connected in parallel.
  • the switching controller 400 receives the second notification signal from the current estimator 300.
  • the switching controller 400 in response to the second notification signal, the switching controller 400 outputs only one of the first control signal and the second control signal and stops the other output.
  • the switching controller 400 stops outputting the second control signal while outputting the first control signal, only the first switch SW1 of the first switch SW1 and the second switch SW2 is turned on. Accordingly, the first capacitor C 1 is electrically connected to the third node N 3 together with the third capacitor C 3 , while the second capacitor C 2 is electrically connected from the fourth node N 4 . Electrically isolated.
  • FIG. 9 illustrates an operation when the switching controller 400 receives the third notification signal from the current estimator 300.
  • the switching controller 400 stops output of the first control signal and the second control signal in response to the third notification signal.
  • both the first switch SW1 and the second switch SW2 are turned off so that the first capacitor C 1 and the second capacitor C 2 are respectively the third node N 3 and the fourth node.
  • the capacitance between the third node N 3 and the ground and the capacitance between the fourth node N 4 and the ground are reduced by one half, thereby enabling faster estimation of charge and discharge current.
  • the switching controller 400 may output a third control signal.
  • FIG. 10 illustrates an operation when the switching controller 400 receives the fourth notification signal from the current estimator 300.
  • the switching controller 400 stops outputting a third control signal for inducing turn-on of the relay 30.
  • the relay 30 is turned off, and the charge / discharge current is completely blocked.
  • the switching controller 400 may stop the output of the first control signal and the second control signal.
  • the current estimating apparatus 2 has a current value and a first estimated number of times (for example, three times) during a first period in which both the first and second switches SW1 and SW2 are turned on every predetermined period. And a current value estimated for a predetermined number of times (eg, three times) during the second period in which the second switches SW1 and SW2 are both turned off, to determine the magnitude of the noise flowing into the charge / discharge path.
  • a predetermined number of times eg, three times
  • the time difference between the time of estimating the electric current value in a 1st period, and the time of estimating electric current value in a 2nd period is less than a threshold value.
  • the switching controller 400 may output a signal for commanding the turn-off of the relay 30 when the determined noise level is greater than or equal to a predetermined level.
  • FIG. 11A and 11B are graphs comparing the results of a radiation test (RI test) for the conventional current estimating apparatus of FIG. 1 and the current estimating apparatus of FIG. 2, respectively.
  • the RI test means a test for observing the degree of radiated interference among tests related to electromagnetic susceptibility (EMS).
  • EMS electromagnetic susceptibility
  • Figure 11a is a shunt capacitor, and a graph showing a result of the radiation interference tests in the state (C s) is not present, and Fig. 11b is performing the radiation interference test in a state in which the shunt capacitor (C s) present
  • 11A and 11B show the results of estimating the charge / discharge current when the charge / discharge current does not flow.
  • a shunt current flows at approximately 1.39 GHz to 1.42 GHz.
  • the current estimator 300 incorrectly judges that the shunt current flows.
  • the present invention provides an effect of preventing the potential difference from occurring in the shunt portion 100 in a specific high frequency region of the electromagnetic wave.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention concerne, selon un mode de réalisation, un dispositif d'estimation de courant permettant d'estimer un courant de charge/décharge d'un bloc-batterie, le dispositif comprenant : une résistance de dérivation raccordée entre un premier nœud et un second nœud, qui sont formés sur un trajet de charge/décharge d'un bloc-batterie ; un condensateur de dérivation raccordé entre le premier nœud et le second nœud ; une unité de mesure de tension raccordée entre le premier nœud et le second nœud pour mesurer une tension appliquée à la résistance de dérivation ; et une unité d'estimation de courant permettant d'estimer un courant de charge/décharge du bloc-batterie à l'aide d'une tension mesurée par l'unité de mesure de tension.
PCT/KR2017/002399 2016-03-07 2017-03-06 Dispositif d'estimation de courant de charge/décharge Ceased WO2017155260A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US15/765,655 US10539623B2 (en) 2016-03-07 2017-03-06 Charging/discharging current estimation device
EP17763521.6A EP3351952B1 (fr) 2016-03-07 2017-03-06 Dispositif d'estimation de courant de charge/décharge
PL17763521T PL3351952T3 (pl) 2016-03-07 2017-03-06 Urządzenie szacowania prądu ładowania/rozładowania
JP2018529130A JP6610912B2 (ja) 2016-03-07 2017-03-06 充放電電流推定装置、バッテリーパック、および自動車
CN201780003644.8A CN108139448B (zh) 2016-03-07 2017-03-06 充电/放电电流估计装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20160027243 2016-03-07
KR10-2016-0027243 2016-03-07
KR1020170027932A KR102014468B1 (ko) 2016-03-07 2017-03-03 충방전 전류 추정 장치
KR10-2017-0027932 2017-03-03

Publications (1)

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WO2017155260A1 true WO2017155260A1 (fr) 2017-09-14

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PCT/KR2017/002399 Ceased WO2017155260A1 (fr) 2016-03-07 2017-03-06 Dispositif d'estimation de courant de charge/décharge

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WO (1) WO2017155260A1 (fr)

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CN110040035A (zh) * 2019-03-26 2019-07-23 陈林龙 动力电池组的检测维护方法
TWI678543B (zh) * 2018-11-08 2019-12-01 宏碁股份有限公司 電池電量估計方法與電子裝置
CN110754028A (zh) * 2018-03-12 2020-02-04 株式会社Lg化学 防止过放电的设备
CN118818197A (zh) * 2024-09-19 2024-10-22 中汽研新能源汽车检验中心(天津)有限公司 一种电动汽车智能充放电测试装置及方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110754028A (zh) * 2018-03-12 2020-02-04 株式会社Lg化学 防止过放电的设备
CN110754028B (zh) * 2018-03-12 2023-09-26 株式会社Lg新能源 防止过放电的设备
TWI678543B (zh) * 2018-11-08 2019-12-01 宏碁股份有限公司 電池電量估計方法與電子裝置
US10908221B2 (en) 2018-11-08 2021-02-02 Acer Incorporated Battery power estimating method and electronic device
CN110040035A (zh) * 2019-03-26 2019-07-23 陈林龙 动力电池组的检测维护方法
CN118818197A (zh) * 2024-09-19 2024-10-22 中汽研新能源汽车检验中心(天津)有限公司 一种电动汽车智能充放电测试装置及方法

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