WO2005050234A1 - 飽和分極推定方法及び装置、並びに、放電可能容量推定方法 - Google Patents
飽和分極推定方法及び装置、並びに、放電可能容量推定方法 Download PDFInfo
- Publication number
- WO2005050234A1 WO2005050234A1 PCT/JP2004/015400 JP2004015400W WO2005050234A1 WO 2005050234 A1 WO2005050234 A1 WO 2005050234A1 JP 2004015400 W JP2004015400 W JP 2004015400W WO 2005050234 A1 WO2005050234 A1 WO 2005050234A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage drop
- current
- polarization
- discharge
- maximum
- Prior art date
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Classifications
-
- 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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
-
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
Definitions
- This value is multiplied by the maximum current, and the value obtained by multiplying the above value by the polarization voltage drop corresponding to the maximum current in the approximation formula is defined as the saturation polarization voltage drop. Therefore, based on the actually measured discharge current and terminal current, it is possible to obtain a saturation polarization voltage drop that is useful for grasping the maximum of the capacity that cannot be discharged due to polarization, which occurs when the maximum current is continuously supplied.
- the dischargeable capacity is estimated based on the value obtained by subtracting the voltage drop due to the resistance. Therefore, based on the estimated dischargeable capacity, it is possible to accurately determine whether or not the state of the battery can reliably drive a load that needs to flow the maximum current.
- the state of the battery is a state in which a load requiring the maximum current can be reliably driven. Since the determination can be made accurately, it is possible to obtain a method for estimating the dischargeable capacity capable of accurately grasping the state of the knowledge.
- FIG. 1 is a graph showing a relationship between a measured discharge current I and one terminal voltage V of a battery during high-rate discharge.
- FIG. 2 is a graph for explaining a breakdown of a voltage drop generated in a battery due to discharge.
- FIG. 5 is a flowchart showing a processing procedure performed by a microcomputer 23a in FIG.
- the terminal voltage of a notch indicates a voltage value that reflects the state of charge of the notch, and it differs only in its internal state, that is, when it is in an equilibrium state and when it is in an unbalanced state. It is also known that the discharge current flowing from the battery takes a value that reflects the voltage drop that occurs inside the battery! / Puru.
- a short time can be set to, for example, 400 msec or less, and a large maximum current can be set to, for example, 3 C or more.
- high-rate discharge when the discharge current and the battery terminal voltage during this high-rate discharge are measured, the change in terminal voltage with respect to a wide range of change in discharge current from 0 to the maximum current is obtained. Can be measured. Therefore, the data pair obtained by high-speed sampling of the discharge current and the battery terminal voltage at the time of high-rate discharge is plotted with the horizontal axis representing the discharge current and the vertical axis representing the terminal voltage, respectively.
- a voltage drop other than the voltage drop (Rj X Ip) due to the pure resistance Rj is a voltage drop Vpolp due to polarization generated in the battery.
- Figure 2.1 “Cells as a Function of Operating Current” indicates that when a large discharge current is applied, the polarization is a constant value corresponding to the magnitude of the discharge current. It can be said that there is a saturation polarization voltage drop that saturates at
- the difference voltage (Vf ⁇ Ve) between the full charge voltage (Vf OCVf—Rf X Ip: OCVf is the open circuit voltage at the time of full charge) and the discharge end voltage Ve
- the voltage value is an index of the capacity that can be discharged in the fully charged state. Therefore, the ratio of the voltage Va dc to the difference voltage (Vf-Ve) is defined as the dischargeable capacity ADC (%).
- ADC (%) ⁇ Vadc / (Vf— Ve) ⁇ X 100...
- the second-order approximation formula for the voltage drop due to polarization can also be obtained by removing the voltage drop (RjXI) due to the pure resistance Rj from the second-order approximation formula force obtained above.
- Vpolp alp 2 + blp + c
- Vpolp + ⁇ Vpolp Vpolp + Rs X Ip
- the voltage drop V pols at this time can be obtained by substituting the discharge current Imax into the equation (4).
- Vpols aImax + blmax + c
- FIG. 4 is a block diagram showing an embodiment of a dischargeable capacity estimating device incorporating the battery saturation polarization estimating device of the present invention.
- This dischargeable capacity estimating apparatus is an apparatus that performs the saturated polarization estimation method and the dischargeable capacity estimation method of the present invention to obtain the saturation polarization and the dischargeable capacity.
- the device of the present embodiment indicated by reference numeral 1 in the figure is mounted on a hybrid vehicle having a motor generator 5 in addition to the engine 3.
- the generator 5 is configured to function as a motor, and the output of the motor generator 5 is transmitted from the drive shaft 7 to the wheels 11 in addition to the output of the engine 3 to perform assisted traveling.
- the hybrid vehicle is configured such that the motor generator 5 functions as a generator (generator) during deceleration or braking, converts kinetic energy into electric energy, and charges the battery 13.
- the motor generator 5 functions as a generator (generator) during deceleration or braking, converts kinetic energy into electric energy, and charges the battery 13.
- the motor generator 5 further has a force used as a starter motor for forcibly rotating the flyhole of the engine 3 when the engine 3 is started when a starter switch (not shown) is turned on. Inrush current flows.
- the device 1 of the present embodiment includes a discharge current I of the battery 13 with respect to electric components, such as a motor generator 5 functioning as a motor-starter motor for assist traveling, and a generator 1 A current sensor 15 that detects the charging current from the functioning motor generator 5 to the battery 13, and a voltage that has a resistance of about 1 M ohm connected in parallel with the notch 13 and detects the terminal voltage V of the battery 13 A sensor 17 is provided.
- the device 1 of the present embodiment also includes a microcomputer (hereinafter referred to as “IZF”) in which the outputs of the above-described current sensor 15 and voltage sensor 17 are fetched after AZD conversion in an interface circuit (hereinafter, abbreviated as “IZF”) 21.
- IZF microcomputer
- the microcomputer 23 has a CPU 23a, a RAM 23b, and a ROM 23c. Among them, the IZF 21 is connected to the CPU 23a in addition to the RAM 23b and the ROM 23c. Starter switches, induction switches and accessory switches, and switches for electrical components (loads) other than the motor generator 5 are further connected.
- the RAM 23b has a data area for recording various data and a work area used for various processing operations.
- the RAM 23b stores a control program for causing the CPU 23a to perform various processing operations. ! RU
- the process of obtaining the quadratic approximation equation curve uses the least squares method.
- each ⁇ term is calculated to obtain a quadratic approximation equation when the current decreases.
- Step S3 the approximate expression for increasing the current is calculated using the calculated terms for increasing the current, and the approximate expression for decreasing the power supply is calculated using the calculated terms for decreasing the current.
- step S4 is obtained (step S4).
- step S5 The arithmetic processing for obtaining the pure resistance of the battery from the quadratic approximation equation obtained as described above is executed (step S5).
- the modified quadratic approximation formula to obtain the modified quadratic approximation formula excluding this concentration polarization voltage drop Perform calculation processing.
- the calculation to find the intermediate value between the two differential values as the pure resistance of the battery is performed.
- the obtained pure resistance of the battery is stored in the data area of the RAM 23b for use for various purposes.
- step S5 the voltage drop due to the pure resistance Rj calculated in step S5 is deleted from the approximation formula for the current increase calculated in step S4, and the approximate voltage drop due to factors other than the pure resistance when the current increases is calculated.
- An equation, that is, a quadratic approximation (hereinafter abbreviated as polarization approximation) representing the polarization voltage drop corresponding to the discharge current in the current increasing direction in the high-rate discharge is obtained (step S6). From the above, it can be seen that the CPU 23a functions as an approximate expression detecting means.
- the pure resistance Rj calculated in step S5 and the polarization approximation formula obtained in step S6 are used to calculate the saturation polarization voltage drop in the saturation polarization estimation process in step S7.
- step S8 the pure resistance voltage drop (Rj X Ip) due to the battery's pure resistance Rj calculated in step S5, and the maximum voltage that varies according to the state of charge of the battery.
- the total voltage drop is calculated by adding the pure resistance increase voltage drop due to the change in pure resistance ( ⁇ RX Ip) and the saturation polarization voltage drop (Vpolp + ⁇ Vpolp), which is the maximum voltage drop due to the polarization generated by the maximum current Ip. Estimate Vmax.
- step S9 When the maximum voltage drop is obtained by the total voltage drop estimation processing in step S8, in the next step S9, the ADC rate calculation processing is performed using the above-described equation (2). After the calculation of ADC (%) in step S9 is completed, ADC estimation processing for obtaining ADC (Ah) is performed using equation (3) (step S10).
- the ADC (Ah) estimated by the process of step S10 that is, the dischargeable capacity that can continue discharging at the maximum current Ip at the time of high rate discharge is used in other subsequent processes. (Step Sl l). As other processing, for example, it can be used as a guide for determining whether or not the engine can be restarted after idling stop. In addition
- step S12 The process shown in the flowchart of FIG. 5 is continuously executed as long as the induction switch is on (step S12).
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04792569A EP1691208A1 (en) | 2003-11-19 | 2004-10-19 | Saturation polarization estimation method and device, and discharge-enabled capacitance estimation method |
US10/579,726 US20070052423A1 (en) | 2003-11-19 | 2004-10-19 | Method and an apparatus for estimating saturated polarization and a method for estimating residual discharge capacity |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003389072A JP2005147987A (ja) | 2003-11-19 | 2003-11-19 | 飽和分極推定方法及び装置、並びに、放電可能容量推定方法 |
JP2003-389072 | 2003-11-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005050234A1 true WO2005050234A1 (ja) | 2005-06-02 |
Family
ID=34616240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015400 WO2005050234A1 (ja) | 2003-11-19 | 2004-10-19 | 飽和分極推定方法及び装置、並びに、放電可能容量推定方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070052423A1 (ja) |
EP (1) | EP1691208A1 (ja) |
JP (1) | JP2005147987A (ja) |
WO (1) | WO2005050234A1 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8466684B2 (en) * | 2006-06-16 | 2013-06-18 | Chevron Technology Ventures Llc | Determination of battery predictive power limits |
JP4706648B2 (ja) * | 2007-03-06 | 2011-06-22 | トヨタ自動車株式会社 | 電動車両、充電状態推定方法および充電状態推定方法をコンピュータに実行させるためのプログラムを記録したコンピュータ読取可能な記録媒体 |
JP4379484B2 (ja) * | 2007-04-06 | 2009-12-09 | 株式会社デンソー | 車両システム |
JP4962808B2 (ja) | 2009-02-24 | 2012-06-27 | 株式会社デンソー | エンジン自動制御装置および蓄電池充電制御装置 |
EP2451003B1 (en) * | 2009-06-29 | 2018-09-19 | NGK Insulators, Ltd. | End-of-discharge voltage correction device and end-of-discharge voltage correction method |
WO2011013248A1 (ja) * | 2009-07-31 | 2011-02-03 | 富士通株式会社 | 残量表示方法、残量表示プログラム、残量表示装置および電子機器 |
FR2969304B1 (fr) * | 2010-12-17 | 2013-05-10 | Continental Automotive France | Procede de determination de l'etat de charge d'une batterie |
JP5270775B1 (ja) * | 2012-03-09 | 2013-08-21 | トヨタ自動車株式会社 | 電動車両および電動車両の制御方法 |
JP2015155859A (ja) * | 2014-02-21 | 2015-08-27 | ソニー株式会社 | 電池残量推定装置、電池パック、蓄電装置、電動車両および電池残量推定方法 |
CN108254690A (zh) * | 2016-12-29 | 2018-07-06 | 天津安源科技发展有限公司 | 一种电池极化活性饱和度检测装置及方法 |
CN109975716A (zh) * | 2019-03-07 | 2019-07-05 | 天津力神电池股份有限公司 | 一种锂离子电池内阻波动的检测方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002249006A (ja) * | 2001-02-23 | 2002-09-03 | Yazaki Corp | 車両用バッテリ純抵抗測定方法及び装置 |
-
2003
- 2003-11-19 JP JP2003389072A patent/JP2005147987A/ja not_active Abandoned
-
2004
- 2004-10-19 EP EP04792569A patent/EP1691208A1/en not_active Withdrawn
- 2004-10-19 US US10/579,726 patent/US20070052423A1/en not_active Abandoned
- 2004-10-19 WO PCT/JP2004/015400 patent/WO2005050234A1/ja not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002249006A (ja) * | 2001-02-23 | 2002-09-03 | Yazaki Corp | 車両用バッテリ純抵抗測定方法及び装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1691208A1 (en) | 2006-08-16 |
US20070052423A1 (en) | 2007-03-08 |
JP2005147987A (ja) | 2005-06-09 |
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