CN202393834U - Precise ohmic internal resistance measurer for battery - Google Patents
Precise ohmic internal resistance measurer for battery Download PDFInfo
- Publication number
- CN202393834U CN202393834U CN2011204570542U CN201120457054U CN202393834U CN 202393834 U CN202393834 U CN 202393834U CN 2011204570542 U CN2011204570542 U CN 2011204570542U CN 201120457054 U CN201120457054 U CN 201120457054U CN 202393834 U CN202393834 U CN 202393834U
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- battery
- internal resistance
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- alternating current
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Abstract
The utility model discloses a precise ohmic internal resistance measurer for a battery. A pulse width modulation (PWM) precise alternating current constant-current source generates small current with a frequency of 1kHz; a current circuit is formed by a high-precision resistor and a battery to be measured; alternating current response signals are generated at two ends of a standard resistor and at two ends of the battery respectively; the alternating current response signals at the two ends of the standard resistor are selected by a signal switcher and then are sent into a precise alternating current coupling operational amplifier; an output signal is converted into a digital signal by an analog-to-digital conversion circuit and the digital signal is sent into a singlechip for processing and storing in sequence; the alternating current response signals at the two ends of the battery to be measured are selected by the signal switcher and then are sent into the precise alternating current coupling operational amplifier; another output signal is converted into another digital signal by the analog-to-digital conversion circuit and the digital signal is sent into the singlechip for processing and storing in sequence; the singlechip performs operation processing on data information obtained by the processing for two times, so that an internal resistance value of the battery is obtained; and the obtained internal resistance value of the battery is displayed on a display module for intuitively displaying the internal resistance value of the battery.
Description
Technical field
The utility model relates to the instrument that the accurate ohmic internal resistance of a kind of battery is measured.Belong to the battery detecting field.
Background technology
Because the internal resistance of cell is very little, current battery internal resistance measurement Instrument measuring precision is lower, the actual surveying instrument precision less than of using 1%; Simultaneously; Different instruments possibly draw different internal resistance values because of adopting the different measuring method, owing to do not seek unity of standard, so the measurement result confidence level is not high.
Summary of the invention
The utility model is intended to invent a kind of method of the new-type measurement internal resistance of cell, can improve the measuring accuracy of the internal resistance of cell, also can exchange measurement with standard ohm resistance simultaneously, and measurement result is genuine and believable.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
The utility model equipment structure chart is seen accompanying drawing 1, comprises: the accurate AC constant-current source of PWM, one 0.1% precision resister; A signal shifter, an AC coupling precision operational-amplifier, an analog to digital conversion circuit; A single-chip microcomputer, a display module, a tested battery;
The utility model course of work: by the accurate AC constant-current source of PWM; Produce the little electric current of the 0.1A of a 1KHz frequency; Form current circuit through one 0.1% precision resister and mesuring battary, produce the AC response signal, pass through the AC response signal at signal shifter choice criteria resistance two ends earlier in standard resistor at two terminals and battery two ends; Send into the AC coupling precision operational-amplifier; The signal of AC coupling precision operational-amplifier output through analog to digital conversion circuit, transfers digital signal to and sends into and handle the back in the single-chip microcomputer and preserve; Select the AC response signal at tested battery two ends again through signal shifter; Send into the AC coupling precision operational-amplifier; The signal of AC coupling precision operational-amplifier output through analog to digital conversion circuit, transfers digital signal to and sends into and handle the back in the single-chip microcomputer and preserve; The data message that single-chip microcomputer obtains twice processing carries out calculation process, obtains internal resistance of cell value, and the internal resistance of cell value that obtains is shown on the display module, intuitively shows internal resistance of cell value.
The utility model internal resistance measurement operation program block diagram is seen accompanying drawing 2, principle of operation:
Standard resistor at two terminals AC response signal voltage is U1, and it is U2 that the battery two ends produce the AC response signal voltage, and high precision measuring resistance resistance is R1; The internal resistance of cell is Rx, because therefore battery and high precision measuring resistance are serially connected in the current return; Electric current I equates that following formula is then arranged:
I=?U1/R1=U2/Rx;
Known U1, R1 and U2, then
Rx=(U2*R1)/U1
Compare with prior art, the utility model obtains reference information through the mode that inserts measuring resistance, carries out comprehensive computing with the battery response signal; Can calculate the internal resistance of cell through Ohm law; The value that draws is with a high credibility, and the long-time stability of equipment are better, simultaneously because the accurate operational amplification circuit of multiplexing one tunnel AC coupling; The circuit high conformity, measuring accuracy is high.
Description of drawings:
Accompanying drawing 1 is the structural drawing of the utility model;
Accompanying drawing 2 is the utility model internal resistance measurement operation program block diagrams.
Embodiment:
For the technical scheme that makes the utility model is clearer, below in conjunction with accompanying drawing and embodiment, to the utility model further explain, instantiation described herein only in order to explain the utility model, is not limited to the utility model.
Practical measuring examples:
See also shown in the accompanying drawing 1 first step: prepare the accurate AC constant-current source of a PWM, it is the interchange precision constant current source of the little electric current of 0.1A of a 1KHz frequency; In second step, one 0.1% precision resister and mesuring battary are inserted in the constant-current power supply circuit; In the 3rd step,, send into the AC coupling precision operational-amplifier through the AC response signal at signal shifter choice criteria resistance two ends; In the 4th step, the signal of AC coupling precision operational-amplifier output through analog to digital conversion circuit, transfers digital signal to and sends into and handle the back storage in the single-chip microcomputer; The 5th step, select the AC response signal at tested battery two ends through signal shifter, send into the AC coupling precision operational-amplifier; In the 6th step, the signal of AC coupling precision operational-amplifier output through analog to digital conversion circuit, transfers digital signal to and sends into and handle the back storage in the single-chip microcomputer; In the 7th step, single-chip microcomputer carries out calculation process with the data message that obtains for twice.Obtain internal resistance of cell value; In the 8th step, the internal resistance of cell value that obtains is shown on the display module.
Claims (2)
1. the accurate ohmic internal resistance measuring instrument of battery comprises: the accurate AC constant-current source of PWM, one 0.1% precision resister; A signal shifter, an AC coupling precision operational-amplifier, an analog to digital conversion circuit; A single-chip microcomputer, a display module, a tested battery; It is characterized by: by the accurate AC constant-current source of PWM; Produce the little electric current of the 0.1A of a 1KHz frequency; Form current circuit through one 0.1% precision resister and mesuring battary, produce the AC response signal, pass through the AC response signal at signal shifter choice criteria resistance two ends earlier in standard resistor at two terminals and battery two ends; Send into the AC coupling precision operational-amplifier; The signal of AC coupling precision operational-amplifier output through analog to digital conversion circuit, transfers digital signal to and sends into and handle the back in the single-chip microcomputer and preserve; Select the AC response signal at tested battery two ends again through signal shifter; Send into the AC coupling precision operational-amplifier; The signal of AC coupling precision operational-amplifier output through analog to digital conversion circuit, transfers digital signal to and sends into and handle the back in the single-chip microcomputer and preserve; The data message that single-chip microcomputer obtains twice processing carries out calculation process, obtains internal resistance of cell value, and the internal resistance of cell value that obtains is shown on the display module, intuitively shows internal resistance of cell value.
2. the accurate ohmic internal resistance measuring instrument of a kind of battery according to claim 1 is characterized in that: insert measuring resistance, through the internal resistance of Ohm law counting cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204570542U CN202393834U (en) | 2011-11-17 | 2011-11-17 | Precise ohmic internal resistance measurer for battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204570542U CN202393834U (en) | 2011-11-17 | 2011-11-17 | Precise ohmic internal resistance measurer for battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202393834U true CN202393834U (en) | 2012-08-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204570542U Expired - Fee Related CN202393834U (en) | 2011-11-17 | 2011-11-17 | Precise ohmic internal resistance measurer for battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202393834U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678134A (en) * | 2015-03-18 | 2015-06-03 | 艾德克斯电子（南京）有限公司 | AC constant current source, internal resistance detecting device of cell and cell testing instrument |
| CN106226702A (en) * | 2016-07-25 | 2016-12-14 | 深圳天珑无线科技有限公司 | A kind of battery capacity detection circuit, battery capacity check method and device |
| CN104166050B (en) * | 2013-05-15 | 2017-04-12 | 乐金信世股份有限公司 | Monitoring apparatus and method of battery contact point |
-
2011
- 2011-11-17 CN CN2011204570542U patent/CN202393834U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166050B (en) * | 2013-05-15 | 2017-04-12 | 乐金信世股份有限公司 | Monitoring apparatus and method of battery contact point |
| CN104678134A (en) * | 2015-03-18 | 2015-06-03 | 艾德克斯电子（南京）有限公司 | AC constant current source, internal resistance detecting device of cell and cell testing instrument |
| CN104678134B (en) * | 2015-03-18 | 2017-06-20 | 艾德克斯电子（南京）有限公司 | AC constant-current source, internal resistance of cell detection means and cell tester |
| CN106226702A (en) * | 2016-07-25 | 2016-12-14 | 深圳天珑无线科技有限公司 | A kind of battery capacity detection circuit, battery capacity check method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 Termination date: 20141117 |
|
| EXPY | Termination of patent right or utility model |