CN101359035A - Method and apparatus for measuring battery internal resistance - Google Patents

Method and apparatus for measuring battery internal resistance Download PDF

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Publication number
CN101359035A
CN101359035A CNA2007101300817A CN200710130081A CN101359035A CN 101359035 A CN101359035 A CN 101359035A CN A2007101300817 A CNA2007101300817 A CN A2007101300817A CN 200710130081 A CN200710130081 A CN 200710130081A CN 101359035 A CN101359035 A CN 101359035A
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CN
China
Prior art keywords
discharge
mesuring battary
charging
current
voltage
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Pending
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CNA2007101300817A
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Chinese (zh)
Inventor
田林祖
郑广月
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BYD Co Ltd
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BYD Co Ltd
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Priority to CNA2007101300817A priority Critical patent/CN101359035A/en
Publication of CN101359035A publication Critical patent/CN101359035A/en
Pending legal-status Critical Current

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Abstract

The invention provides a method and a device for measuring the battery internal resistance; the method and the device detect a discharge current or charge current I, as well as a discharge or charge voltage U1 of the battery under detection, and then detect a voltage U2 after discharge or charge of the battery under detection so as to calculate an internal resistance r of the battery under detection; and the internal resistance r is equal to (U2-U1)/I. The method and the device are easy to implement and are low in cost, which can be widely used in battery chargers, back-up power supplies and other mobile power supplies.

Description

A kind of method and device of measuring the internal resistance of cell
Technical field
The present invention relates to a kind of method and device of measuring the internal resistance of cell.
Background technology
Measuring the internal resistance of cell was even more important for the life-span of estimating secondary rechargeable battery.Present existing internal resistance of cell measuring method and device mainly contain two kinds: one is the alternating-current measurement method, as disclosed technical scheme among the CN1818684A, it applies the identical periodicity alternating current of peak value at contrast resistance with the mesuring battary two ends respectively, measure this electric current then and contrasting the voltage responsive that resistance and mesuring battary two ends cause, because but the resistance of electric current identical then passing ratio computing and contrast resistance is determined the internal resistance of mesuring battary, so this method and device are owing to adopt alternating current to need various signal processing circuits, filtering circuit or the like is so structure is comparatively complicated, the implementation cost height, less stable; Two is the DC pulse method of testing, this scheme makes mesuring battary begin with heavy-current discharge more than 2 minutes via variable load usually, this big electric current is generally 5 * more than (C/1 hour), wherein C is the battery rated capacity, unit is MAH (mAH), then with low discharging current, go out two caused voltage differences of electric current and calculate the mesuring battary internal resistance with COMPUTER CALCULATION then, but this scheme needs heavy-current discharge, so must influence the life-span and the capacity of mesuring battary, and the other side electricity current requirements is than higher, the circuit more complicated, the cost height is so and owing to need the computing machine scope of application to be very limited.
In sum, the method for the existing measurement internal resistance of cell and device have circuit complexity, implementation cost height even affect battery life and the defective of capacity.
Summary of the invention
The method and the device that the present invention is directed to the above-mentioned existing measurement internal resistance of cell have circuit complexity, implementation cost height even affect battery life and the defective of capacity, and method and the device of the measurement internal resistance of cell simple, with low cost under a kind of prerequisite not affecting battery life and capacity is provided.
The method of the measurement internal resistance of cell provided by the invention may further comprise the steps: make mesuring battary begin discharge, or begin mesuring battary is charged; Detect discharge current or the charging current I of mesuring battary, the voltage U when detecting simultaneously mesuring battary discharge or charging 1Make mesuring battary stop discharge, or stop mesuring battary being charged; Voltage U after the discharge of detection mesuring battary or the charging 2Calculate the internal resistance r of mesuring battary, the internal resistance r=(U of this mesuring battary 2-U 1)/I.
The device of the measurement internal resistance of cell provided by the invention comprises current sensing means, voltage check device and internal resistance counter, voltage U when discharge current or charging current I when described current sensing means is used to detect mesuring battary discharge or charging, described voltage check device are used for detecting mesuring battary discharge or charging respectively 1And the voltage U after mesuring battary discharge or the charging 2, described internal resistance counter is used to calculate the internal resistance r of mesuring battary, the internal resistance r=(U of this mesuring battary 2-U 1)/I.
The method and apparatus of the measurement internal resistance of cell that the application of the invention provides can be by the discharge of control mesuring battary or charging, stop then discharge or charging forms a pulse with this, the voltage U during by the discharge that detects or charging current I and discharge or charging 1, the discharge or the charging after voltage U 2, calculate the internal resistance of cell according to Ohm's law.From technical scheme described above, the method and apparatus circuit of the measurement internal resistance of cell provided by the present invention is simple, implementation cost is cheap, simple, and the discharge current that this mode provides is little electric current, can not influence the life-span and the capacity of battery.Method provided by the present invention can be widely used in secondary rechargeable battery, is specially adapted to NI-MH, NI-Cd, lithium ion battery, because it is simple and easy to do, so can be widely used on the removable power supplys such as charger and back-up source.
Description of drawings
Fig. 1 is the circuit diagram according to the device of the measurement internal resistance of cell provided by the invention;
Fig. 2 is the circuit diagram according to the preferred embodiment of the device of the measurement internal resistance of cell provided by the invention;
Fig. 3 is the circuit diagram according to another preferred embodiment of the device of the measurement internal resistance of cell provided by the invention.
Embodiment
Method provided by the invention at first is described.
The method of the measurement internal resistance of cell provided by the invention may further comprise the steps: make mesuring battary 10 begin discharge, or begin mesuring battary 10 chargings; Detect discharge current or the charging current I of mesuring battary 10, the voltage U when detecting simultaneously mesuring battary discharge or charging 1Make mesuring battary 10 stop discharge, or stop mesuring battary 10 chargings; Voltage U after the discharge of detection mesuring battary or the charging 2Calculate the internal resistance r of mesuring battary 10, the internal resistance r=(U of this mesuring battary 10 2-U 1)/I.
Wherein by being connected with resistance 26, mesuring battary 10 can so that mesuring battary 10 externally discharges, can charge to mesuring battary 10 by mesuring battary 10 is connected with power supply.
Discharge or charging current I and unstable when mesuring battary 10 has just begun discharge or charging, so preferably, when mesuring battary 10 begins discharge or after charging a period of time, just detect the discharge of the discharge current of mesuring battary 10 or charging current I and mesuring battary or voltage U when charging 1Institute's elapsed time is greater than 100 milliseconds, and preferable range is the 100-1000 millisecond.
Detect the discharge current of mesuring battary 10 or the method that charging current I can adopt the known various detection electric currents of those skilled in the art, such as using galvanometer, universal meter, current sensor etc., also can obtain by the voltage of detection series resistance 26 and in conjunction with known resistance.Detect the voltage U of mesuring battary 1Or U 2Can use the known various detection voltage method of those skilled in the art, working voltage meter etc. for example can be by detecting mesuring battary 10 ground level is obtained.
Described discharge current or charging current I are greater than 0.5 * (C/1 hour), and C is the battery rated capacity, 1000mAH for example, and I is just greater than 500mA like this.Such electric current is little electric current, can not affect battery life and capacity.The preferable range of described discharge current or charging current I is 0.5 * (C/1 hour)-2 * (C/1 hour).
Device 20 below in conjunction with Fig. 1-3 explanation measurement internal resistance of cell provided by the invention, as shown in Figure 1, wherein, this device 20 comprises current sensing means 21, voltage check device 22 and internal resistance counter 23, discharge current or charging current I when described current sensing means 21 is used to detect mesuring battary 10 discharges or charging, the voltage U when described voltage check device 22 is used for detecting mesuring battary discharge or charging respectively 1And the voltage U after mesuring battary discharge or the charging 2, described internal resistance counter 23 is used to calculate the internal resistance r of mesuring battary 10, the internal resistance r=(U of this mesuring battary 10 2-U 1)/I.
Under the preferable case, as shown in Figure 2, when just beginning when stablize to detect, discharge or charging current discharge or charging current, therefore this device 20 also comprises timer 24, timer 24 picks up counting when mesuring battary 10 begins discharge or charging, and when timer 24 timing arrived the scheduled time, these timer 24 notice current sensing means 21 detected discharge current or the charging current I of this moment, and the voltage U of notice voltage check device 22 when detecting the mesuring battary discharge of this moment or charging 1The wherein said schedule time, preferable range was the 100-1000 millisecond greater than 100 milliseconds.And, when described timer 24 timing arrive the schedule time, timer 24 zero clearings.
Under the preferable case, as shown in Figure 2, the device 20 of the measurement internal resistance of cell provided by the invention also comprises switch 25, is connected in the discharge circuit or charging circuit of mesuring battary 10, is used for discharge or the charged state of control mesuring battary 10.Wherein said switch 25 can be various gate-controlled switches with control end, for example relay, triode or field effect transistor.Above-mentioned timer 24 can also consist of the time relay with relay.
In this case, this device 20 also comprises on-off controller (not shown), the disconnection and the closure that are used for gauge tap 25, for example the control end (base stage or gate pole) by control triode or field effect transistor thus the conducting of voltage control triode or field effect transistor or end.
Described current sensing means 21 is used to detect the discharge current or the charging current I of mesuring battary 10, and as mentioned above, this discharge current or charging current I are greater than 0.5 * (C/1 hour).The preferable range of described discharge current or charging current I is 0.5 * (C/1 hour)-2 * (C/1 hour).Described current sensing means 21 can be preferably the device that the electric current that records can be outputed to internal resistance counter 23 for well known to a person skilled in the art the various devices that are used to detect electric current.Under the preferable case, shown in Fig. 2,3, the device of the measurement internal resistance of cell provided by the invention comprises that also resistance is the resistance 26 of R, and this resistance 26 is connected in the discharge circuit or charging circuit of mesuring battary 10, at this moment can utilize voltage check device 22 by detecting the voltage U at these resistance 26 two ends RThereby, obtain described discharge current or charging current I, described discharge current or charging current I=U R/ R is so this moment, voltage check device 22 was actually same voltage check device with current sensing means 21.
Described voltage check device 22 can be selected the known various devices that are used to detect voltage of those skilled in the art for use, as voltmeter or the like, is preferably the device that the voltage that records can be outputed to internal resistance counter 23.
Described internal resistance counter 23 can be simple computing machine with common computing function, single-chip microcomputer (MCU) etc., as be that the then above-mentioned timer of single-chip microcomputer 24, on-off controller, current sensing means 21, voltage check device 22 also can pass through chip microcontroller, this mode shows in Fig. 3.MCU can be by detecting the voltage U to ground level acquisition mesuring battary 10 of mesuring battary 10 1 ends among Fig. 3 1Or U 2, and by detecting the voltage U to ground level acquisition resistance 26 of resistance 26 1 ends RSo above-mentioned current sensing means 21, voltage check device 22 all can be realized by MCU, MCU also can come gauge tap 25 by outputs level signals, MCU can possess general simple computing function in addition, can be integrated with internal resistance calculator 23 and calculate internal resistance r.Just can finish function by a single-chip microcomputer like this, more simple.
When adopting the preferred embodiment of device 20 of the measurement internal resistance of cell of the present invention that Fig. 2 provides, at first close switch 25, and mesuring battary 10 is discharge or charging externally, through detecting the voltage U at resistance 26 two ends after the scheduled time RThereby, obtain discharge current or charging current I=U R/ R, voltage U when detecting simultaneously mesuring battary discharge or charging 1Cut-off switch 25 then, detect the rear voltage U of mesuring battary discharge or charging 2Utilize Ohm law then, calculate the internal resistance r=(U of mesuring battary 10 by internal resistance counter 23 2-U 1)/I.Method and apparatus provided by the invention is implemented simple, and is with low cost, can be widely used on the movable power sources such as charger and back-up source.

Claims (11)

1. method of measuring the internal resistance of cell, wherein, this method may further comprise the steps:
Make mesuring battary (10) begin discharge, or begin mesuring battary (10) is charged;
Detect discharge current or the charging current I of mesuring battary (10), the voltage U when detecting simultaneously mesuring battary discharge or charging 1
Make mesuring battary (10) stop discharge, or stop mesuring battary (10) is charged;
Voltage U after the discharge of detection mesuring battary or the charging 2
Calculate the internal resistance r of mesuring battary (10), the internal resistance r=(U of this mesuring battary (10) 2-U 1)/I.
2. method according to claim 1 wherein, after mesuring battary (10) begins at least 100 milliseconds of discharge or chargings, just detects discharge current or charging current I and the mesuring battary discharge of mesuring battary (10) or the voltage U when charging 1
3. method according to claim 2, wherein, when mesuring battary (10) begins discharge or charging 100-1000 millisecond, the voltage U when detecting the discharge current of mesuring battary (10) or charging current I and mesuring battary discharge or charging 1
4. method according to claim 1 and 2, wherein, discharge current or charging current I greater than 0.5 * (battery rated capacity/1 hour), less than 2 * (battery rated capacity/1 hour).
5. device of measuring the internal resistance of cell, wherein, this device (20) comprises current sensing means (21), voltage check device (22) and internal resistance counter (23); Voltage U when discharge current or charging current I when described current sensing means (21) is used to detect mesuring battary (10) discharge or charging, described voltage check device (22) are used for detecting mesuring battary discharge or charging respectively 1And the voltage U after mesuring battary discharge or the charging 2, described internal resistance counter (23) is used to calculate the internal resistance r of mesuring battary (10), the internal resistance r=(U of this mesuring battary (10) 2-U 1)/I.
6. device according to claim 5, wherein, this device (20) also comprises timer (24), timer (24) picks up counting when mesuring battary (10) begins discharge or charging, and when timer (24) timing arrives greater than scheduled time of 100 milliseconds, this timer (24) notice current sensing means (21) detects discharge current or the charging current I of this moment, and the voltage U of notice voltage check device (22) when detecting the mesuring battary discharge of this moment or charging 1
7. device according to claim 6, wherein, this device (20) also comprises timer (24), timer (24) picks up counting when mesuring battary (10) begins discharge or charging, and when timer (24) timing arrival span is the scheduled time of 100-1000 millisecond, this timer (24) notice current sensing means (21) detects discharge current or the charging current I of this moment, and the voltage U of notice voltage check device (22) when detecting the mesuring battary discharge of this moment or charging 1
8. according to the described device of arbitrary claim among the claim 5-7, wherein, this device (20) comprises that also resistance is the resistance (26) of R, is connected in the discharge circuit or charging circuit of mesuring battary (10) voltage U of described voltage check device (22) when detecting mesuring battary discharge or charging 1The time also detect the voltage U at this resistance (26) two ends simultaneously RThereby, obtain described discharge current or charging current I, described discharge current or charging current I=U R/ R.
9. according to the described device of arbitrary claim among the claim 5-7, wherein, discharge current or charging current I greater than 0.5 * (battery rated capacity/1 hour), less than 2 * (battery rated capacity/1 hour).
10. according to the described device of arbitrary claim among the claim 5-7, wherein, this device also comprises switch (25), is connected in the discharge circuit or charging circuit of mesuring battary (10), is used to control the discharge or the charged state of mesuring battary (10).
11. device according to claim 10, wherein, described switch (25) is relay, triode or field effect transistor, and this device also comprises on-off controller, is used for the closed and disconnected of gauge tap (25).
CNA2007101300817A 2007-07-30 2007-07-30 Method and apparatus for measuring battery internal resistance Pending CN101359035A (en)

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CN102023284A (en) * 2010-12-30 2011-04-20 常州福轮达电子科技有限公司 Fast test method for cell capacity internal resistance and tester
CN102520369A (en) * 2011-12-31 2012-06-27 东方电气集团东方汽轮机有限公司 Online monitoring system for storage battery of fan variable pitch propeller
CN102687365A (en) * 2009-12-17 2012-09-19 Nec能源元器件株式会社 Battery module control system, and battery module control method
CN103018566A (en) * 2012-11-26 2013-04-03 力神迈尔斯动力电池系统有限公司 Lithium ion battery direct current internal resistance testing method and battery screening method
CN103308858A (en) * 2012-03-07 2013-09-18 深圳市柏特瑞电子有限公司 Online inspection system for internal resistances of batteries
CN103439663A (en) * 2013-08-21 2013-12-11 国家电网公司 Storage battery detecting device
CN103995232A (en) * 2014-04-21 2014-08-20 中通客车控股股份有限公司 Lithium iron phosphate power battery pack peak value charge and discharge performance detection method
CN104656039A (en) * 2015-02-04 2015-05-27 上海交通大学 Method and system for detecting service life of rechargeable battery
CN104833856A (en) * 2014-02-12 2015-08-12 鸿富锦精密工业(深圳)有限公司 Method and device for estimating internal resistance of battery
CN104849565A (en) * 2015-05-26 2015-08-19 深圳市共济科技有限公司 Internal resistance detection circuit of lead storage battery
CN105098728A (en) * 2015-08-20 2015-11-25 无锡中星微电子有限公司 Battery protection circuit and power source system
CN105259420A (en) * 2015-11-02 2016-01-20 南车株洲电力机车有限公司 Method and device for measuring internal resistance of energy storage power supply
CN105259415A (en) * 2015-08-28 2016-01-20 友达光电股份有限公司 Calculation method of internal resistance of battery
CN105514513A (en) * 2016-01-05 2016-04-20 惠州市蓝微新源技术有限公司 Power battery charging and discharging control method and system
CN106932731A (en) * 2017-05-05 2017-07-07 江苏金帆电源科技有限公司 The detection method of each accumulator internal resistance in a kind of series-connected batteries
CN106970333A (en) * 2017-05-05 2017-07-21 安徽锐能科技有限公司 The method and device of internal resistance of cell detection
CN106970334A (en) * 2017-05-05 2017-07-21 安徽锐能科技有限公司 The method and device of cell health state detection
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CN108120933A (en) * 2016-11-28 2018-06-05 昶懋国际股份有限公司 Asymmetric battery check device
CN109633464A (en) * 2018-11-26 2019-04-16 国网浙江省电力有限公司台州供电公司 Battery sound state discharge test method
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Cited By (33)

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US9184476B2 (en) 2009-12-17 2015-11-10 Nec Energy Devices, Ltd. Battery module control system and battery module control method
CN102687365B (en) * 2009-12-17 2015-04-01 Nec能源元器件株式会社 Battery module control system, and battery module control method
CN102687365A (en) * 2009-12-17 2012-09-19 Nec能源元器件株式会社 Battery module control system, and battery module control method
CN102023284A (en) * 2010-12-30 2011-04-20 常州福轮达电子科技有限公司 Fast test method for cell capacity internal resistance and tester
CN102520369A (en) * 2011-12-31 2012-06-27 东方电气集团东方汽轮机有限公司 Online monitoring system for storage battery of fan variable pitch propeller
CN103308858A (en) * 2012-03-07 2013-09-18 深圳市柏特瑞电子有限公司 Online inspection system for internal resistances of batteries
CN103018566A (en) * 2012-11-26 2013-04-03 力神迈尔斯动力电池系统有限公司 Lithium ion battery direct current internal resistance testing method and battery screening method
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