CN106932731A - Method for detecting internal resistance of each storage battery in series storage battery pack - Google Patents
Method for detecting internal resistance of each storage battery in series storage battery pack Download PDFInfo
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- CN106932731A CN106932731A CN201710311928.5A CN201710311928A CN106932731A CN 106932731 A CN106932731 A CN 106932731A CN 201710311928 A CN201710311928 A CN 201710311928A CN 106932731 A CN106932731 A CN 106932731A
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- 238000000034 method Methods 0.000 title abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000003750 conditioning effect Effects 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 230000010287 polarization Effects 0.000 description 2
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Classifications
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Tests Of Electric Status Of Batteries (AREA)
Abstract
The invention discloses a method for detecting the internal resistance of each storage battery in a series storage battery pack, which has high precision and does not damage the storage battery, and comprises the following steps: 1) respectively sampling voltage values at two ends of each storage battery in the series storage battery pack at two moments in the discharging process of the storage batteries, conditioning and isolating and amplifying the obtained voltage signals at least twice, and then carrying out analog-to-digital conversion to obtain digital signal quantities corresponding to the analog values of the voltages at the two ends of the storage batteries; 2) measuring current: sampling the discharge current values of the series battery pack at two moments in the step 1) through a shunt to obtain millivolt-level voltage signals, isolating and amplifying the millivolt-level voltage signals, and performing analog-to-digital conversion to obtain digital signal quantity corresponding to the analog value of the discharge current of the series battery pack after performing at least one signal conditioning; 3) and calculating to obtain the internal resistance of each storage battery. The method is particularly suitable for measuring the internal resistance of the storage battery in the formation charging process of the storage battery.
Description
Technical field
The present invention relates to a kind of method for detecting the internal resistance of source, more particularly in a kind of series-connected batteries respectively
The detection method of accumulator internal resistance.
Background technology
Internal resistance is the important parameter for reflecting accumulator property state.Under normal circumstances, the high current of the small battery of internal resistance is put
Electric energy power is strong, and the big battery discharge ability of internal resistance is weak.At present, the method for measurement accumulator internal resistance mainly has direct current method and exchanges
Method.
1st, direct current method
According to physical equation R=V/I, test equipment allows battery, and (generally 2-3 seconds) is forced through one in a short time
Very big Constant Direct Current electric current (generally using the high current of 40A-80A at present), measures the voltage at now battery two ends, by public affairs
Formula, calculates the current internal resistance of cell.If control is proper, certainty of measurement error can be controlled within 0.1%.Though
So, the accuracy of this measuring method is higher, but, this method has clearly disadvantageous part：
(1) high capacity cell or battery can only be measured, small-capacity cells cannot be 2-3 seconds internal loading 40-80A's
High current；
(2) when battery passes through high current, the electrode of inside battery can occur polarization phenomena, produce polarization resistance.Therefore, survey
The amount time must be very short, and the internal resistance value error otherwise measured is very big；
(3) high current has certain damage to the electrode of inside battery by battery.
2nd, alternating current method
Apply a fixed frequency and fixed current (generally using 1KHZ frequencies, 50mA low currents at present) to battery, so
Its voltage is sampled afterwards, calculates the internal resistance of the battery by discharge circuit after a series for the treatment of such as over commutation, filtering
Value.Measured with this method, do not have too big infringement in itself to battery, and almost all of battery can be measured.But, this friendship
Stream method has the disadvantage that：
(1) certainty of measurement of exchange drop measurement method is likely to be influenceed by ripple current, while also harmonic wave electricity
Drain off the possibility disturbed.These can all have influence on the precision of measurement.
(2) certainty of measurement of exchange drop measurement method is not so good as direct-current discharge internal resistance measurement method.
The content of the invention
The technical problems to be solved by the invention are：A kind of high precision is provided, the series connection of damage is not resulted in battery
The detection method of each accumulator internal resistance in batteries.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Each battery in a kind of series-connected batteries
The detection method of internal resistance, its step includes：
1) voltage is measured：Two moment during battery discharging, each battery in series-connected batteries of sampling respectively
The magnitude of voltage at two ends, by signal condition at least twice, (so-called signal condition is simply referred to the voltage signal that will be obtained：Will
The operations such as signal is by amplifying, filtering are converted into the standard signal that collecting device is capable of identify that), also, adjusted in first time signal
Between reason and second signal condition, isolation amplification is carried out, then, the voltage signal after last time is nursed one's health carries out modulus and turns
Get the data signal amount corresponding with the analogue value of the voltage at battery two ends in return；
2) electric current is measured：By current divider sample series battery in step 1) described in two discharge currents at moment
Value, obtains corresponding millivolt magnitude voltage signals, and this millivolt of magnitude voltage signals are carried out at least one times after isolating and amplifying
Signal condition, then, will last time nurse one's health after voltage signal carry out the electric discharge that analog-to-digital conversion obtains with series-connected batteries
The corresponding data signal amount of the analogue value of electric current；
3) by calculating, the internal resistance of each battery is obtained.
As a kind of preferred scheme, in a kind of described series-connected batteries in the detection method of each accumulator internal resistance,
Two described moment, respectively electric discharge start to be opened up to any time between 10 milliseconds after electric discharge starts and electric discharge
Any time between 20 to 30 milliseconds after beginning；Used as further preferred scheme, two described moment, are respectively electric discharges
20 milliseconds after starting with electric discharge during beginning.
As a kind of preferred scheme, in a kind of described series-connected batteries in the detection method of each accumulator internal resistance,
The voltage signal obtained after last time is nursed one's health is converted into data signal amount by the corresponding modulus ALT-CH alternate channel of monolithic.
The beneficial effects of the invention are as follows：The present invention is by the discharge regime in storage battery formation processing in battery
Resistance tested, compare traditional battery internal resistance test method it is simpler efficiently, the present invention by detecting that storage battery is pressed in
Voltage change small in short time in discharge current uphill process so that the voltage and current precision that sampling is obtained is higher, obtains
The internal resistance of cell numerical value for arriving is more accurate reliable, reproducible, and the result of test is available for cell production companies for battery combo,
I.e.：The much the same Making sets of batteries of internal resistance is used；In addition, the present invention can simultaneously measure the multiple batteries in battery series connection group
Internal resistance, also, due to using the regular picture electric current in formation process, so do not interfere with the normal of battery being melted into
Journey, so as to will not cause to damage to battery.Because two moment for measuring are selected in 20 when electric discharge starts and after beginning respectively
Millisecond, the two moment are influenceed smaller by capacitance voltage change in the equivalent model of battery, so as to further increase measurement
Precision.In addition, voltage sampling circuit of the present invention can have the function of voltage polling instrument concurrently, can be battery production
Producer saves the input of lower voltage polling equipment；And, the multiple passages using A/D in the piece of single-chip microcomputer are used for voltage and electricity
Stream signal carries out analog-to-digital conversion, greatly reduces production cost.
Brief description of the drawings
Fig. 1 is the theory diagram that the formation circuit based on battery carries out internal resistance measurement.
Fig. 2 is current-voltage waveform figure when discharge regime starts.
Fig. 3 is the equivalent model of battery.
Fig. 4 is the electric principle assumption diagram that the formation circuit based on battery carries out internal resistance measurement.
Specific embodiment
Below in conjunction with the accompanying drawings, the detection of each accumulator internal resistance in a kind of series-connected batteries of the present invention is described in detail
The specific embodiment of method.
As shown in figure 1, single-chip microprocessor MCU performs the Battery formation technique of user's setting, by voltage sampling circuit and electric current
Sample circuit carrys out the voltage and current of real-time sampling battery, controls the voltage and current of charge and discharge control loop modulation output,
And in the process, measure the internal resistance of battery；Shown in Figure 4, it is concretely comprised the following steps：
1) voltage is measured：Two moment during battery discharging be 20 milliseconds when starting electric discharge and after electric discharge this two
Individual moment -- shown in Figure 2, the magnitude of voltage at each battery two ends, the voltage that will be obtained in series-connected batteries of sampling respectively
Signal carries out isolation amplification by signal condition twice, also, between first time signal condition and second signal condition,
Then, corresponding A/D passages carry out analog-to-digital conversion during the voltage signal after last time i.e. second is nursed one's health delivers to single-chip microcomputer
Obtain the data signal amount corresponding with the analogue value of the voltage at battery two ends；
2) electric current is measured：By current divider sample series battery in step 1) described in two discharge currents at moment
Value, obtains corresponding millivolt magnitude voltage signals, and this millivolt of magnitude voltage signals carry out signal tune after isolating and amplifying
Reason, then, the analogue value phase that analog-to-digital conversion obtains with the discharge current of series-connected batteries is carried out by the voltage signal after conditioning
Corresponding data signal amount；
3) by step 1) and step 2) obtain accurate curent change Δ I and voltage change Δ U -- referring to Fig. 2 institutes
Show, it is well known that battery can be equivalent to model as shown in Figure 3, Ri is the internal resistance of cell, in short time heavy-current discharge, can
Think that the terminal voltage on battery capacitor is constant, then the voltage change Δ U that battery output is measured is equal to voltage on internal resistance of cell Ri
Change, therefore, it can be drawn according to formula R=△ U/ △ I the internal resistance of battery.
In practical application, as shown in figure 4, described voltage and current signal condition is used based on amplifier LMV321
And its modulate circuit that peripheral circuit is constituted；The voltage of each battery, the sampling channel of electric current are mutually isolated, from each other
It is unaffected.The voltage of each battery, the VDD1~VDDn of the first order conditioning ring current of current sample passage are by being
The main power source VDD0 that single-chip microprocessor MCU end powers is produced by isolation DC-DC power source.
In sum, only presently preferred embodiments of the present invention, not for limiting the scope of present invention implementation, it is all according to
The impartial change that shape, construction, feature and spirit described in scope of the invention as claimed are made and modification, all should be included in this
In the right of invention.
Claims (4)
1. in a kind of series-connected batteries each accumulator internal resistance detection method, its step includes：
1) voltage is measured：Two moment during battery discharging, each battery two ends in series-connected batteries of sampling respectively
Magnitude of voltage, the voltage signal that will be obtained believes by signal condition at least twice in first time signal condition and second
Between number conditioning, carry out isolation amplification, then, will last time nurse one's health after voltage signal carry out analog-to-digital conversion and obtain and electric power storage
The corresponding data signal amount of the analogue value of the voltage at pond two ends；
2) electric current is measured：By current divider sample series battery in step 1) described in two discharge current values at moment,
Corresponding millivolt magnitude voltage signals are obtained, this millivolt of magnitude voltage signals are believed at least one times after isolating and amplifying
Number conditioning, then, will last time nurse one's health after voltage signal carry out analog-to-digital conversion and obtain and the electric discharge of series-connected batteries electricity
The corresponding data signal amount of the analogue value of stream；
3) by calculating, the internal resistance of each battery is obtained.
2. in series-connected batteries according to claim 1 each accumulator internal resistance detection method, it is characterised in that：It is described
Two moment, respectively electric discharge start up to electric discharge start after 10 milliseconds between any time and electric discharge start after
20 to 30 milliseconds between any time.
3. in series-connected batteries according to claim 2 each accumulator internal resistance detection method, it is characterised in that：It is described
Two moment, respectively be electric discharge start when and electric discharge start after 20 milliseconds.
4. in the series-connected batteries according to claim 1,2 or 3 each accumulator internal resistance detection method, its feature exists
In：The voltage signal obtained after last time is nursed one's health is converted into digital letter by the corresponding modulus ALT-CH alternate channel of single-chip microcomputer
Number amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710311928.5A CN106932731A (en) | 2017-05-05 | 2017-05-05 | Method for detecting internal resistance of each storage battery in series storage battery pack |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517056A (en) * | 2017-09-25 | 2017-12-26 | 深圳市福光动力通信设备有限公司 | A kind of section amplification method and circuit applied in internal resistance of cell measurement |
| CN110031679A (en) * | 2019-03-28 | 2019-07-19 | 广东工业大学 | A kind of inner walkway technology based on forming and capacity dividing power supply |
| CN113484758A (en) * | 2021-06-29 | 2021-10-08 | 湖南大学 | Storage battery internal resistance detection circuit and use method thereof |
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| CN201145709Y (en) * | 2007-12-31 | 2008-11-05 | 比亚迪股份有限公司 | Apparatus for testing battery essential resistance |
| CN101359035A (en) * | 2007-07-30 | 2009-02-04 | 比亚迪股份有限公司 | Method and apparatus for measuring battery internal resistance |
| CN101477149A (en) * | 2008-12-12 | 2009-07-08 | 艾默生网络能源有限公司 | On-line DC detection method and system for internal resistance of accumulator |
| CN104698383A (en) * | 2013-12-06 | 2015-06-10 | 东莞钜威新能源有限公司 | Battery internal resistance measuring and calculating method and circuit of battery pack management system |
| CN205157652U (en) * | 2015-11-23 | 2016-04-13 | 上海电力学院 | Direct current undercurrent secondary discharge holds internal resistance of cell on -line measuring device |
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2017
- 2017-05-05 CN CN201710311928.5A patent/CN106932731A/en active Pending
Patent Citations (5)
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| CN101359035A (en) * | 2007-07-30 | 2009-02-04 | 比亚迪股份有限公司 | Method and apparatus for measuring battery internal resistance |
| CN201145709Y (en) * | 2007-12-31 | 2008-11-05 | 比亚迪股份有限公司 | Apparatus for testing battery essential resistance |
| CN101477149A (en) * | 2008-12-12 | 2009-07-08 | 艾默生网络能源有限公司 | On-line DC detection method and system for internal resistance of accumulator |
| CN104698383A (en) * | 2013-12-06 | 2015-06-10 | 东莞钜威新能源有限公司 | Battery internal resistance measuring and calculating method and circuit of battery pack management system |
| CN205157652U (en) * | 2015-11-23 | 2016-04-13 | 上海电力学院 | Direct current undercurrent secondary discharge holds internal resistance of cell on -line measuring device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107517056A (en) * | 2017-09-25 | 2017-12-26 | 深圳市福光动力通信设备有限公司 | A kind of section amplification method and circuit applied in internal resistance of cell measurement |
| CN110031679A (en) * | 2019-03-28 | 2019-07-19 | 广东工业大学 | A kind of inner walkway technology based on forming and capacity dividing power supply |
| CN113484758A (en) * | 2021-06-29 | 2021-10-08 | 湖南大学 | Storage battery internal resistance detection circuit and use method thereof |
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Application publication date: 20170707 |