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WO2023053352A1 - Dispositif électrique - Google Patents

Dispositif électrique Download PDF

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Publication number
WO2023053352A1
WO2023053352A1 PCT/JP2021/036162 JP2021036162W WO2023053352A1 WO 2023053352 A1 WO2023053352 A1 WO 2023053352A1 JP 2021036162 W JP2021036162 W JP 2021036162W WO 2023053352 A1 WO2023053352 A1 WO 2023053352A1
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WO
WIPO (PCT)
Prior art keywords
battery unit
power converter
unit
processor
voltage
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/JP2021/036162
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English (en)
Japanese (ja)
Inventor
達哉 神野
健次 柴田
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to PCT/JP2021/036162 priority Critical patent/WO2023053352A1/fr
Priority to JP2023550918A priority patent/JP7577871B2/ja
Publication of WO2023053352A1 publication Critical patent/WO2023053352A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health

Definitions

  • the present invention mainly relates to evaluation of the degree of deterioration of battery units provided in electrical devices.
  • a battery unit that can be mounted on an electrical device such as a work machine or vehicle needs to be replaced depending on the degree of deterioration (see Patent Document 1).
  • the manner in which the battery unit is used may differ depending on the application of the electrical device in which it is mounted, a technique for more appropriately evaluating the degree of deterioration of the battery unit is generally required.
  • An exemplary object of the present invention is to make it possible to appropriately evaluate the degree of deterioration of a battery unit relatively easily.
  • a first aspect of the present invention relates to an electrical device, the electrical device comprising: a battery unit; an inverter that converts the output voltage of the battery unit; a functional unit that realizes a predetermined function based on the voltage converted by the inverter; a current detection unit that detects a current from the battery unit to the inverter; and a processor for driving and controlling the inverter, wherein The processor causing the inverter to output an AC voltage and alternating the frequency of the AC voltage; The degree of deterioration of the battery unit is evaluated based on the detection result of the current detection section obtained in the frequency band that changes in the order.
  • FIG. 4 is a flow chart showing an example of a method for evaluating the degree of deterioration of a battery unit
  • FIG. 10 is a diagram showing an example of a lookup table for evaluation
  • FIG. 1 is a block diagram showing an example of the configuration of an electrical device 1 according to an embodiment.
  • the electrical device 1 includes a battery unit 11 , a power converter 12 , a functional section 13 , a voltage detection section 14 , a current detection section 15 , a temperature detection section 16 and a processor 17 .
  • the battery unit 11 typically outputs a DC (Direct Current) voltage.
  • a rechargeable secondary battery such as a lithium ion battery can be used for the battery unit 11 .
  • the battery unit 11 may simply be expressed as a battery.
  • the power converter 12 is configured to be able to convert the output voltage of the battery unit 11 .
  • the power converter 12 includes a plurality of transistors M1 to M4 provided in series and in parallel, and each of them individually becomes conductive or non-conductive so that the output voltage of the battery unit 11 to AC (Alternating Current) voltage.
  • Power converter 12 may be expressed as an inverter.
  • Known switch elements such as MOS (Metal Oxide Semiconductor) transistors and bipolar transistors may be used for the transistors M1 to M4.
  • the functional unit 13 realizes a predetermined function based on the voltage converted by the power converter 12.
  • the concept of function includes the function that realizes the application of the electrical device 1, which may be the main function of the electrical device 1 or a sub-function.
  • Such functional unit 13 is connected to power converter 12 as an internal load of electrical device 1 .
  • an external load (not shown) may be connectable to power converter 12 via terminal T1 for external connection.
  • the electric device 1 is a working machine, and the function is a working function.
  • work include lawn mowing, snow removal, farm work, and the like.
  • the electrical device 1 may be a vehicle, in which case the function may be a driving function.
  • the electrical device 1 may be a mobile object without wheels (eg, a ship, etc.), in which case the function may be a locomotion function or a propulsion function. That is, the concept of electrical device 1 can include any device that performs a given function based on electrical energy. From another point of view, the electrical device 1 can also be expressed as a CBU (Completely Built-Up) or the like.
  • CBU Consumer Built-Up
  • the voltage detection unit 14 is configured to detect the output voltage of the power converter 12 .
  • a known voltmeter can be used for the voltage detection unit 14 .
  • the current detection unit 15 is configured to detect the current from the battery unit 11 to the power converter 12 .
  • a known ammeter can be used for the current detector 15 .
  • the temperature detection unit 16 is configured to detect the temperature of the battery unit 11 .
  • a known temperature sensor can be used for the temperature detection unit 16 .
  • the processor 17 functions as a system controller (or simply a controller) that controls the entire system of the electric device 1, and drives and controls each of the elements included in the electric device 1. Although the details will be described later, the processor 17 sends a sinusoidal control signal to each of the plurality of transistors M1 to M4 by means of, for example, the driver 18, thereby driving and controlling the power converter 12.
  • FIG. 1 A system controller (or simply a controller) that controls the entire system of the electric device 1, and drives and controls each of the elements included in the electric device 1.
  • the processor 17 sends a sinusoidal control signal to each of the plurality of transistors M1 to M4 by means of, for example, the driver 18, thereby driving and controlling the power converter 12.
  • the processor 17 includes a CPU (Central Processing Unit) 171 , a memory 172 and a communication interface 173 .
  • the functions of the processor 17 described here are realized by the CPU 171 developing a predetermined program on the memory 172 and executing it.
  • the concept of the memory 172 can include RAM (Random Access Memory) as well as ROM (Read Only Memory).
  • the program may be read from ROM or via communication interface 173 .
  • the processor 17 may be composed of a semiconductor device such as an ASIC (Application Specific Integrated Circuit), that is, the functions of the processor 17 may be realized by either hardware or software.
  • ASIC Application Specific Integrated Circuit
  • FIG. 2 is a flow chart showing an example of a method for evaluating the degree of deterioration of the battery unit 11. As shown in FIG. Each step of this flow chart is mainly executed by the processor 17 . The outline is to evaluate the degree of deterioration of the battery unit 11 based on the output current of the battery unit 11 while changing the frequency of the AC voltage output by the power converter 12 .
  • step S1010 (hereinafter simply referred to as “S1010”; the same applies to other steps described later), the plurality of transistors M1 and the like are controlled to cause the power converter 12 to output an AC voltage. Altering (sweeping) the frequency of the AC voltage. Accordingly, the battery unit 11 outputs AC current to the power converter 12 while changing the frequency. In addition, the frequency may be changed from one of the low frequency and the high frequency to the other, or may be changed so as to reciprocate.
  • the detection results of the voltage detection unit 14 and the current detection unit 15 are acquired for the frequency bands that are sequentially changed in S1010.
  • the voltage detection unit 14 detects the AC voltage output by the power converter 12 while changing the frequency in S ⁇ b>1010 described above, and outputs the result to the controller 17 .
  • the current detection unit 15 detects the AC current output by the battery unit 11 while changing the frequency in S1010 and outputs the result to the controller 17 .
  • the current waveform from the battery unit 11 to the power converter 12 fluctuates, and the current value is the current It can be detected by the detection unit 15 .
  • the voltage waveform output by the power converter 12 fluctuates, and the voltage value can be detected by the voltage detection unit 14 .
  • the degree of deterioration of the battery unit 11 is evaluated based on the AC voltage (detection result of the voltage detection unit 14) whose frequency changes and the AC current (detection result of the current detection unit 15) therebetween, and the degree of deterioration is evaluated. If satisfies the criteria, this flow chart ends, and if not, the process advances to S1040. The details of the evaluation method will be described later.
  • This notification may be made to the user via a predetermined notification unit (for example, display panel, LED light source, sound source, etc.) that may be provided in the electrical device 1 .
  • a predetermined notification unit for example, display panel, LED light source, sound source, etc.
  • the battery unit 11 when the battery unit 11 is repeatedly charged and discharged, the battery unit 11 deteriorates. For example, due to denaturation of the electrolyte contained in the battery unit 11, the charging ability and discharging ability may decrease.
  • the degree can be evaluated based on whether the internal impedance of the battery unit 11 (resistance component, reactance component and capacitance component at a certain frequency) satisfies a standard. In the following description, the evaluation of the degree of deterioration of the battery unit 11 may simply be expressed as "evaluation".
  • the evaluation results of the degree of deterioration can fluctuate depending on the environment. For example, depending on the frequency band of the AC voltage converted and output by the power converter 12, the battery unit 11 may be usable, or the use should be avoided (when the battery unit 11 needs to be replaced). ) is also available. Also, depending on the temperature of the battery unit 11, the battery unit 11 may be usable or should be refrained from being used. Therefore, evaluation may be required to be carried out from multiple perspectives.
  • the internal impedance of the battery unit 11 may be calculated to determine whether the battery unit 11 needs to be replaced.
  • FIG. 3 shows an example of the lookup table Tb1 that is referenced during evaluation.
  • the allowable output power (unit [W (watt)]) of the battery unit 11 can be set in the lookup table Tb1 corresponding to each internal impedance.
  • Lookup table Tb1 includes a plurality of lookup tables corresponding to a predetermined temperature range (for example, -40 to +160 [°C]), from which one corresponding to the detection result of temperature detection unit 16 is selected. It should be referred to as According to the lookup table Tb1, it is possible to determine whether the battery unit 11 can be used based on the power required to drive the function unit 13, for example.
  • the evaluation may be performed in a manner suitable for the application of the electrical device 1, that is, the lookup table Tb1 may be set individually. Moreover, according to this aspect, the evaluation is not performed based only on the internal impedance calculated as described above. Therefore, it is possible to specify or estimate the environment (temperature, frequency, etc.) in which the use of the battery unit 11 should be restricted, and the details of the deterioration, for example.
  • the lookup table Tb1 may be expressed as a reference table, a reference map, or the like.
  • evaluation may be performed individually for each of a plurality of frequencies in the frequency band to be evaluated. For example, when the frequency determined to limit the use of the battery unit 11 is higher than the reference (such as when the use of the battery unit 11 should be limited in a band above a predetermined frequency), It may be determined that replacement is required. During such arithmetic processing, correction based on the detection result of the temperature detection unit 16 may be performed.
  • the evaluation can be performed based on the internal impedance of the battery unit 11 that can be calculated by Fourier transforming the detection result of the current detection unit 15 .
  • the internal impedance of the battery unit 11 can be calculated by Fourier transforming the detection result of the current detection unit 15 .
  • Correction based on the detection result of the temperature detection unit 16 may be performed during such arithmetic processing as well.
  • the phase difference between the AC voltage output by the power converter 12 and the AC current detected by the current detection unit 15 may change to an initial value (for example, replacement of the battery unit 11). It is also conceivable that it will fluctuate from the phase difference immediately after). Therefore, the evaluation may be made based on the phase difference between the AC voltage output by the power converter 12 and the AC current detected by the current detector 15 . Alternatively/incidentally, the phase difference between the control mode of the plurality of transistors M1 to M4 and the AC voltage (or AC current) may fluctuate from the initial value. Therefore, as yet another example, the evaluation may be further based on the phase difference with the control signal of the power converter 12 . Also in these cases, correction may be performed based on the detection result of the temperature detection unit 16 .
  • evaluation of the degree of deterioration of the battery unit 11 can be relatively easily and multifaceted, and the evaluation can be performed by the electric device 1 itself without using an external device for evaluation. is possible. Therefore, according to this embodiment, it can be said that the usability of the electric device 1 is also improved.
  • a first aspect relates to an electrical device (eg, 1), the electrical device includes a battery unit (eg, 11), a power converter (eg, 12) for converting the output voltage of the battery unit, and A function unit (for example, 13) that realizes a predetermined function based on the converted voltage, a current detection unit (for example, 15) that detects current flowing from the battery unit to the power converter, and driving the power converter. and a processor (e.g. 17) for controlling, the processor causing the power converter to output an AC voltage and alternating the frequency of the AC voltage to obtain in the alternating frequency band. and evaluating the degree of deterioration of the battery unit based on the detection result of the current detection unit. According to the first aspect, it is possible to evaluate the degree of deterioration of the battery unit relatively easily and multifacetedly.
  • the detection result of the current detection unit is an AC current
  • the processor detects AC current based on the phase difference between the AC voltage output by the power converter and the AC current detected by the current detection unit. The evaluation is performed. According to the second aspect, it is possible to more appropriately evaluate the degree of deterioration of the battery unit.
  • the processor performs Fourier transform on the detection result of the current detection section to calculate the internal impedance of the battery unit, and performs the evaluation based on the calculation result. According to the third aspect, it is possible to more simply evaluate the degree of deterioration of the battery unit.
  • a fourth aspect is characterized in that the processor refers to a predetermined lookup table (for example, Tb1) when performing the evaluation. According to the fourth aspect, it is possible to more appropriately evaluate the degree of deterioration of the battery unit.
  • a temperature detection unit (for example, 16) that detects the temperature of the battery unit is further provided, the lookup table is one of a plurality of lookup tables, and the processor detects a temperature of the plurality of lookup tables.
  • One of the up-tables corresponding to the detection result of the temperature detection unit is selected and referred to. According to the fifth aspect, it is possible to more appropriately evaluate the degree of deterioration of the battery unit.
  • a sixth aspect is characterized in that the processor notifies that replacement of the battery unit is necessary based on the result of the evaluation. According to the sixth aspect, it becomes possible for the user to replace the battery unit.
  • a seventh aspect is characterized in that the electric device is a vehicle, and the functional unit implements a driving function. According to the seventh aspect, the above-described evaluation method can be adopted in a typical vehicle.
  • An eighth aspect is characterized in that the electric device is a working machine, and the functional unit realizes a working function. According to the eighth aspect, the above-described evaluation method can be adopted in a typical working machine.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Le dispositif électrique de la présente invention comprend une unité de batterie, un convertisseur de puissance destiné à convertir une tension de sortie de l'unité de batterie, une unité fonctionnelle destinée à réaliser une fonction prescrite sur la base de la tension convertie par le convertisseur de puissance, une unité de détection de courant destinée à détecter un courant électrique, de l'unité de batterie au convertisseur de puissance, et un processeur destiné à commander l'attaque du convertisseur de puissance, le processeur amenant le convertisseur de puissance à délivrer une tension en CA et modifier séquentiellement la fréquence de la tension en CA, et évaluant le degré de dégradation de l'unité de batterie sur la base d'un résultat de détection en provenance de l'unité de détection de courant, obtenu dans la bande de la fréquence modifiée séquentiellement.
PCT/JP2021/036162 2021-09-30 2021-09-30 Dispositif électrique Ceased WO2023053352A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2021/036162 WO2023053352A1 (fr) 2021-09-30 2021-09-30 Dispositif électrique
JP2023550918A JP7577871B2 (ja) 2021-09-30 2021-09-30 電気装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/036162 WO2023053352A1 (fr) 2021-09-30 2021-09-30 Dispositif électrique

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WO2023053352A1 true WO2023053352A1 (fr) 2023-04-06

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PCT/JP2021/036162 Ceased WO2023053352A1 (fr) 2021-09-30 2021-09-30 Dispositif électrique

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JP (1) JP7577871B2 (fr)
WO (1) WO2023053352A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11252711A (ja) * 1998-03-04 1999-09-17 Motor Jidosha Kk 電気自動車用電源装置
JP2007085772A (ja) * 2005-09-20 2007-04-05 Toyota Motor Corp バッテリ状態検知装置、バッテリ状態検知方法
JP2009080104A (ja) * 2007-09-07 2009-04-16 Panasonic Corp 二次電池の寿命推定装置および二次電池の寿命推定方法
JP2009244088A (ja) * 2008-03-31 2009-10-22 Toyota Central R&D Labs Inc リチウムイオン二次電池の状態検出方法及びリチウムイオン二次電池の状態検出装置
US20130141109A1 (en) * 2011-12-05 2013-06-06 Corey T. Love Battery Health Monitoring System and Method
JP2013537638A (ja) * 2010-08-27 2013-10-03 インペリアル イノヴェイションズ リミテッド 電気自動車、ハイブリッド電気自動車、および他の用途でのバッテリ監視
JP2019097272A (ja) * 2017-11-21 2019-06-20 株式会社クボタ 作業車及び作業車管理システム

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112017022706B1 (pt) 2015-04-20 2022-09-27 Nissan Motor Co., Ltd Aparelho de controle e método de controle
WO2017145306A1 (fr) 2016-02-24 2017-08-31 本田技研工業株式会社 Dispositif d'alimentation électrique, machine, et procédé de commande

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11252711A (ja) * 1998-03-04 1999-09-17 Motor Jidosha Kk 電気自動車用電源装置
JP2007085772A (ja) * 2005-09-20 2007-04-05 Toyota Motor Corp バッテリ状態検知装置、バッテリ状態検知方法
JP2009080104A (ja) * 2007-09-07 2009-04-16 Panasonic Corp 二次電池の寿命推定装置および二次電池の寿命推定方法
JP2009244088A (ja) * 2008-03-31 2009-10-22 Toyota Central R&D Labs Inc リチウムイオン二次電池の状態検出方法及びリチウムイオン二次電池の状態検出装置
JP2013537638A (ja) * 2010-08-27 2013-10-03 インペリアル イノヴェイションズ リミテッド 電気自動車、ハイブリッド電気自動車、および他の用途でのバッテリ監視
US20130141109A1 (en) * 2011-12-05 2013-06-06 Corey T. Love Battery Health Monitoring System and Method
JP2019097272A (ja) * 2017-11-21 2019-06-20 株式会社クボタ 作業車及び作業車管理システム

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Publication number Publication date
JP7577871B2 (ja) 2024-11-05
JPWO2023053352A1 (fr) 2023-04-06

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