CN207528887U - A kind of cell batteries internal resistance measurement circuit - Google Patents
A kind of cell batteries internal resistance measurement circuit Download PDFInfo
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- CN207528887U CN207528887U CN201721625489.7U CN201721625489U CN207528887U CN 207528887 U CN207528887 U CN 207528887U CN 201721625489 U CN201721625489 U CN 201721625489U CN 207528887 U CN207528887 U CN 207528887U
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Abstract
The utility model provides a kind of cell batteries internal resistance measurement circuit, including：MCU micro controller units, differential amplifier circuit, switch driving circuit, bandpass filtering amplifying circuit, load resistance, current sampling resistor and discharge switch；The load resistance, current sampling resistor, discharge switch are serially connected in the both ends of tested single battery, form DC pulse discharge loop；The input of the bandpass filtering amplifying circuit terminates at the both ends of tested single battery, and output terminal connects the analog-to-digital conversion mouth ADC2 of the MCU micro controller units；The input of the differential amplifier circuit terminates at the both ends of the current sampling resistor, and output terminal connects the analog-to-digital conversion mouth ADC1 of the MCU micro controller units；The input terminal of the switch driving circuit is connected to MCU micro controller units, and output terminal connects the discharge switch.The utility model can measure in batches and unattended, of low cost, the high certainty of measurement of energy, performance are stablized.
Description
Technical field
The utility model is related to a kind of cell batteries internal resistance measurement circuit, can be to lead-acid accumulator, lithium battery including
Various battery cells internal resistance measurement, and low cost, accuracy are high.
Background technology
The internal resistance of cell is battery performance, the very important parameter of quality, and one is normally expired electric battery, internal resistance value
Must be in the factory-designed range of producer, if internal resistance value is extremely bigger than normal at this time, illustrating battery, there are problems.Therefore, it is sharp
The or not of judging the quality of its performance, health have become at present the trend of mainstream in the industry with the internal resistance for measuring accumulator.However,
Test the internal resistance not a duck soup of battery particularly high capacity cell, the cost of used test instrumentation is moved on then thousands of
Ten thousand, and still have several drawbacks, for example internal resistance of cell mensuration most general at present has the following two kinds：
1st, direct-current discharge internal resistance measurement method.
According to physical equation R=V/I, test equipment allows battery (to be generally 2-3 seconds) in a short time and is forced through one
Very big Constant Direct Current electric current (high current for generally using 40A-80A at present) measures the voltage at battery both ends at this time, and by public affairs
Formula calculates the current internal resistance of cell.This method is disadvantageous in that：
1) high capacity cell or accumulator can only be measured, small-capacity cells can not be 2-3 seconds internal loading 40A-80A's
High current；
2) when battery passes through high current, polarization phenomena can occur for the electrode of inside battery, generate polarization resistance.Therefore it measures
Time must be very short, and the internal resistance value error otherwise measured is very big；
3) high current has certain damage by battery to the electrode of inside battery.
2nd, pressure drop internal resistance measurement method is exchanged.
Because battery is actually equivalent to an active pull-up, therefore we apply a fixed frequency and fixation to battery
Then electric current samples its voltage, the battery is calculated by operational amplifier circuit after a series of processing such as over commutation, filtering
Internal resistance value.This method is disadvantageous in that：Technology content is higher, is designed to that the cost of product is also higher, the relevant technologies
It generally rests in foreign famous brand name producer hand.It is unfavorable for large scale deployment to use into unattended monitoring application scheme.
In view of the foregoing, the utility model proposes a kind of completely new technology, direct-current discharge method mensuration and friendship are solved
The shortcoming of drop measurement method is flowed, reaches the mesh that accumulator internal resistance can carry out the unattended measurement monitoring application of batch
Mark, naturally it is also possible to applied in handheld instrument.And this scheme is of low cost, high certainty of measurement is technically simple, and performance is stablized.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of cell batteries internal resistance measurement circuit, measure
It can carry out in batches and unattended and of low cost, the high certainty of measurement of energy, performance are stablized.
The utility model circuit is realized in：A kind of cell batteries internal resistance measurement circuit, including：MCU microcontrollers
It device unit, differential amplifier circuit, switch driving circuit, bandpass filtering amplifying circuit, load resistance, current sampling resistor and puts
Electric switch；
The load resistance, current sampling resistor, discharge switch are serially connected in the both ends of tested single battery, form direct current arteries and veins
Impulse electricity circuit；The input of the bandpass filtering amplifying circuit terminates at the both ends of tested single battery, described in output terminal connection
The analog-to-digital conversion mouth ADC2 of MCU micro controller units；The input of the differential amplifier circuit terminates at the current sampling resistor
Both ends, output terminal connects the analog-to-digital conversion mouth ADC1 of the MCU micro controller units；The input terminal of the switch driving circuit
MCU micro controller units are connected to, output terminal connects the discharge switch.
Further, which is set on the dedicated instrument instrument of internal resistance of cell measurement of hand-held
In table.
The utility model has the following advantages that：
1st, the utility model uses low current (electric current of below 1A) DC pulse discharge technology, lossless to tested battery
Wound, can measure the battery of large capacity can also measure the battery of low capacity, and application range is wide；
2nd, the utility model is discharged using the DC pulse of certain frequency, in the voltage fluctuation that tested battery both ends generate
Its background direct current signal can be filtered out easily by the filtering of bandpass filter, leave the part of difference variation, and this is poor
After being worth the filtered device amplification of voltage signal of variation, it can accurately be measured very much and acquire by subsequent analog-digital converter, solve
The problem of small-signal pickup is with measuring.
3rd, load when the utility model uses fixed resistance as battery measurement internal resistance needed for DC pulse electric discharge, has
Advantage at low cost, safe and reliable.
4th, the utility model surveys internal resistance flow, and remember calculating average pulse voltage by the DC pulse electric discharge in multiple periods
Vavg and average pulse electric current Iavg realizes the quasi synchronous control of multiple fine, acquisition and survey calculation, finally extracts accurate
Internal resistance of cell value, strong antijamming capability.
Description of the drawings
The utility model is further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structure diagram of the utility model circuit.
Specific embodiment
Refering to Figure 1, the cell batteries internal resistance measurement circuit of the utility model, including：MCU micro controller units
101st, differential amplifier circuit 102, switch driving circuit 103, bandpass filtering amplifying circuit 104, load resistance 105, current sample
Resistance 106 and discharge switch 107；
The load resistance 105, current sampling resistor 106, discharge switch 107 are according to the correct sequential concatenation of positive-negative polarity
At the both ends of tested single battery B, DC pulse discharge loop is formed；The input terminal of the bandpass filtering amplifying circuit 104
The both ends of tested single battery B are connected on according to positive-negative polarity sequence, output terminal connects the mould of the MCU micro controller units 101
Number conversion mouth ADC2, for extracting and amplifying pulse voltage fluctuation signal；The input of the differential amplifier circuit 102 terminates at institute
The both ends of current sampling resistor 106 are stated, output terminal connects the analog-to-digital conversion mouth ADC1 of the MCU micro controller units 101, is used for
Extraction, amplification DC pulse discharge current signal；The input terminal of the switch driving circuit 103 is connected to MCU microcontroller lists
Member 101, output terminal connect the discharge switch 107.
Wherein, the tested single battery B be a tested battery cell, monomer voltage ranging from 1.0V-16V.The monomer
The internal resistance of cell that accumulator internal resistance measuring circuit is set on hand-held is measured in dedicated instrument and meter.
The function of above-mentioned each circuit module is expressed as follows：
The MCU micro controller units 101：Correct work schedule, scheduling and control are provided；Start internal resistance measurement when
It waits, in a period of MCU micro controller units 101 send discharge pulse, MCU micro controller units 101 itself synchronously complete electricity
The measurement of pond pulse ripple voltage and the measurement of pulse current.Its work schedule remains synchronous, is then counted using R=V/I
Calculate the internal resistance of tested battery.
The differential amplifier circuit 102：During system starts internal resistance measurement work, differential amplifier circuit 102 is real-time
Generated pulse voltage on current sampling resistor 106 is extracted, by enhanced processing, faint signal is become into MCU microcontrollers
The signal that 101 analog-digital converter ADC1 ports of device unit directly can accurately measure.
The switch driving circuit 103：Since discharge switch 107 needs specific driving voltage and current signal, MCU
The pulse signal that micro controller unit 101 provides can not directly drive discharge switch 107, need discharge switch driver circuit 103
The pulse signal that MCU micro controller units 101 provide is converted and then driving discharge switch 107 is normally worked.
The bandpass filtering amplifying circuit 104：During system starts internal resistance measurement work, it is tested single battery B
Positive and negative end is synchronized with the voltage fluctuation signal of DC pulse discharge signal by generating.The Signal averaging is straight battery itself
It flows on voltage signal, is unfavorable for directly measuring.Useless d. c. voltage signal is filtered out when passing through bandpass filtering amplifying circuit 104,
And useless high-frequency interferencing signal, leave behind useful fluctuation signal.After enhanced processing, MCU microcontrollers are formed
The analog-digital converter ADC2 of unit 101 can be with signal measured directly.
The load resistance 105：Suitable load is provided for cell pulse discharge, enables tested single battery B with one
Fixed current impulse is discharged；
The current sampling resistor 106：When tested single battery B carries out pulsed discharge, pulse current will flow through electricity
Sampling resistor 106 is flowed, the pulse voltage of a very little is generated on the resistance, after the processing of rear class differential amplifier circuit 102, is sent
The analog-to-digital conversion mouth ADC1 for entering MCU micro controller units 101 is sampled and is calculated, and is finally converted into pulse current value for calculating
Internal resistance uses.
The discharge switch 107：Usually acquiescence is closed, micro- by MCU when system needs to measure internal resistance
Controller unit 101 provides DC pulse control signal, after the processing of switch driving circuit 103, drives the discharge switch
107, with certain frequency, state that certain duty cycle is switched in DC pulse, so as to make tested battery pulsing electric discharge,
Carry out the measurement work of internal resistance.
The utility model cell batteries internal resistance measurement circuit measuring process is as follows：
The MCU micro controller units 101 generate DC pulse control signal, the pulse signal and through the switch drive
The discharge switch 107 is driven to be operated in the state of DC pulse switch after the processing of circuit 103, so as to make tested single battery B
Pulsing discharges；
When tested single battery B carries out pulsed discharge, pulse current is after the partial pressure of the load resistance in the electricity
The pulse voltage of a very little is generated on stream sampling resistor 106, after rear class differential amplifier circuit enhanced processing, it is micro- to be sent into MCU
The analog-to-digital conversion mouth ADC1 of controller unit 101 is converted into pulse current value；Tested single battery B positive and negative ends will produce simultaneously
The raw voltage fluctuation signal for being synchronized with DC pulse discharge signal is filtered out by bandpass filtering amplifying circuit 104 and enhanced processing
Afterwards, the analog-to-digital conversion mouth ADC2 for being sent to MCU micro controller units 101 is converted to DC voltage value U；
The MCU micro controller units 101 calculate tested single battery according to pulse current value I and DC voltage value U
Internal resistance R.
Although the foregoing describe specific embodiment of the present utility model, those familiar with the art should
Work as understanding, our described specific embodiments are merely exemplary rather than for the limit to the scope of the utility model
Equivalent modification and variation fixed, that those skilled in the art are made in the spirit according to the utility model, all should
Cover in the scope of the claimed protection of the utility model.
Claims (2)
1. a kind of cell batteries internal resistance measurement circuit, it is characterised in that：Including：MCU micro controller units, differential amplification electricity
Road, switch driving circuit, bandpass filtering amplifying circuit, load resistance, current sampling resistor and discharge switch；
The load resistance, current sampling resistor, discharge switch are serially connected in the both ends of tested single battery, form DC pulse and put
Electrical circuit；The input of the bandpass filtering amplifying circuit terminates at the both ends of tested single battery, and it is micro- that output terminal connects the MCU
The analog-to-digital conversion mouth ADC2 of controller unit；The input of the differential amplifier circuit terminates at the two of the current sampling resistor
End, output terminal connect the analog-to-digital conversion mouth ADC1 of the MCU micro controller units；The input terminal connection of the switch driving circuit
In MCU micro controller units, output terminal connects the discharge switch.
2. a kind of cell batteries internal resistance measurement circuit according to claim 1, it is characterised in that：In the cell batteries
Measuring circuit is hindered to be set in the dedicated instrument and meter of internal resistance of cell measurement of hand-held.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721625489.7U CN207528887U (en) | 2017-11-29 | 2017-11-29 | A kind of cell batteries internal resistance measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721625489.7U CN207528887U (en) | 2017-11-29 | 2017-11-29 | A kind of cell batteries internal resistance measurement circuit |
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| Publication Number | Publication Date |
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| CN207528887U true CN207528887U (en) | 2018-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721625489.7U Active CN207528887U (en) | 2017-11-29 | 2017-11-29 | A kind of cell batteries internal resistance measurement circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797074A (en) * | 2017-11-29 | 2018-03-13 | 福州福光电子有限公司 | A kind of cell batteries internal resistance measurement circuit and measuring method |
| CN110231581A (en) * | 2019-06-10 | 2019-09-13 | 哈尔滨佳云科技有限公司 | Accumulator internal resistance measuring circuit and measurement method |
-
2017
- 2017-11-29 CN CN201721625489.7U patent/CN207528887U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797074A (en) * | 2017-11-29 | 2018-03-13 | 福州福光电子有限公司 | A kind of cell batteries internal resistance measurement circuit and measuring method |
| CN107797074B (en) * | 2017-11-29 | 2024-06-14 | 福州福光电子有限公司 | Single storage battery internal resistance measurement circuit and measurement method |
| CN110231581A (en) * | 2019-06-10 | 2019-09-13 | 哈尔滨佳云科技有限公司 | Accumulator internal resistance measuring circuit and measurement method |
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| CP02 | Change in the address of a patent holder |
Address after: 350000 east of the five floor of building 4, M9511 Industrial Park, 18 Ma Jiang Road, Mawei District, Fuzhou, Fujian. Patentee after: Fuzhou Fuguang Electronics Co., Ltd. Address before: 350000 No. 8 Xingfa Road, Fuzhou Development Zone, Fuzhou City, Fujian province (FTA) Patentee before: Fuzhou Fuguang Electronics Co., Ltd. |