CN108061856A - The method for calculating battery capacity by measuring the internal resistance of cell in real time - Google Patents
The method for calculating battery capacity by measuring the internal resistance of cell in real time Download PDFInfo
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- CN108061856A CN108061856A CN201610986087.3A CN201610986087A CN108061856A CN 108061856 A CN108061856 A CN 108061856A CN 201610986087 A CN201610986087 A CN 201610986087A CN 108061856 A CN108061856 A CN 108061856A
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- Prior art keywords
- internal resistance
- real time
- cell
- battery capacity
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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
-
- 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
Abstract
The invention discloses a kind of method for calculating battery capacity by measuring the internal resistance of cell in real time, the measuring method comprises the following steps：A, by voltage sampling circuit, microcontroller analog-to-digital conversion measures loaded work piece voltage in real time；B, by current sampling circuit, microcontroller analog-to-digital conversion measures loaded work piece electric current in real time；C, formula is calculated by the internal resistance of cell and open-circuit voltage and calculates the internal resistance of cell and open-circuit voltage in real time：D, according to open-circuit voltage and battery capacity and the exact correspondence of battery life, real-time battery capacity and battery life are drawn exactly；E, circulating sampling is continuously updated the measurement internal resistance of cell, so as to obtain battery capacity in real time.The invention has the advantages that accurately calculating battery capacity in real time, so as to remove automatic calibration battery electricity, an excellent power supply is provided for robot.
Description
Technical field
Measuring method more particularly to one kind the present invention relates to a kind of battery capacity are calculated by measuring the internal resistance of cell in real time
The method of battery capacity.
Background technology
The battery capacity of existing high voltage and great current cell is calculated by measuring load voltage in real time, is not being connect
During relatively large load, the internal resistance of cell is smaller on the influence of surveyed load voltage, can roughly calculate battery capacity, but big negative in access
During load, internal resistance of cell partial pressure increase surveys load voltage reduction, it is larger that electricity calculates result error；The survey of the existing internal resistance of cell
Amount is to establish functional relation according to battery temperature, ageing state, capacity, it is difficult to establish accurate model to calculate electricity in real time
Pond internal resistance measures open-circuit voltage in real time when can not also load on tape.
The content of the invention
To overcome the above disadvantages, the present invention provides a kind of battery capacity is calculated by measuring the internal resistance of cell in real time
Method.
Present invention technical solution used for the above purpose is：
A kind of method for calculating battery capacity by measuring the internal resistance of cell in real time, the measuring method comprise the following steps：
A, by voltage sampling circuit, microcontroller analog-to-digital conversion measures loaded work piece voltage in real time；
B, by current sampling circuit, microcontroller analog-to-digital conversion measures loaded work piece electric current in real time；
C, formula is calculated by the internal resistance of cell and open-circuit voltage and calculates the internal resistance of cell and open-circuit voltage in real time：
D, according to open-circuit voltage and the exact correspondence of battery capacity, real-time battery capacity is drawn exactly；
E, circulating sampling is continuously updated the measurement internal resistance of cell, so as to obtain battery capacity in real time.
The invention has the advantages that battery capacity is accurately calculated in real time, so as to remove automatic calibration battery electricity
Amount, an excellent power supply is provided for robot.
Description of the drawings
The present invention is further described with implementation below in conjunction with the accompanying drawings.Fig. 1 is the principle of the present invention figure；Fig. 2 be open-circuit voltage with
The correspondence figure of battery capacity.
In figure, 1 is voltage sampling circuit, and 2 be current sampling circuit, and 3 be microcontroller, and 4 be battery, and 5 be load.
Specific embodiment
In Fig. 1, a kind of method for calculating battery capacity by measuring the internal resistance of cell in real time, the measuring method include
Following steps：
A, voltage sampling circuit 1,3 analog-to-digital conversion of microcontroller, 5 operating voltages of measurement load in real time are passed through；
B, current sampling circuit 2,3 analog-to-digital conversion of microcontroller, 5 operating currents of measurement load in real time are passed through；
C, formula is calculated by 4 internal resistance of battery and open-circuit voltage and calculates 4 internal resistance of battery and open-circuit voltage in real time：
Here, open-circuit voltage VBAT, loaded work piece voltage are VR, and 4 internal resistance institute component voltage of battery is Vr, loads 5 operating currents
For I, 4 internal resistance of battery is r；
1st, battery 4 includes voltage sampling circuit 1, current sampling circuit 2, monolithic to load 5 and measuring circuit power supply, measuring circuit
Machine 3；
2nd, 5 operating current of load at measuring circuit sampling A moment, is denoted as IA；Also sampling loads 5 operating voltages simultaneously, is denoted as
VRA；
3rd, similarly, after a cycle, i.e. B moment（The typical cycle is 1 second, within shorter cycle time, it is believed that at this time
Open-circuit voltage VBAT and 4 internal resistance r of battery are constant）, 5 operating currents of load are sampled, are denoted as IB；Meanwhile sample 5 work electricity of load
Pressure, is denoted as VRB；
4th, according to VBAT=VR+Vr=I*r+VR
VBAT=IA*r+VRA can be obtained
VBAT= IB*r+VRB
Solve 4 internal resistance r of battery=(VRB- VRA)/(IA- IB)；
5th, by 4, open-circuit voltage VBAT=IA*r+VRA=(IB*VRA- IA*VRB)/(IB-IA) is calculated；
D, Fig. 2 is seen, X-axis is 4 volume percent of battery, and Y-axis is open-circuit voltage values, definite according to open-circuit voltage and 4 electricity of battery
Correspondence, find real-time 4 electricity of battery exactly, and 4 electricity of battery is all weighed using volume percent.Than
Such as；It is 21.42V to calculate open-circuit voltage, then it is 80% that can find 4 volume percent of battery；
E, circulating sampling is continuously updated measurement 4 internal resistance of battery, so as to obtain 4 electricity of battery in real time.
The above described is only a preferred embodiment of the present invention, not making limitation in any form to the present invention, appoint
What without departing from the present invention program content, any simple modification that technical spirit according to the invention makees above example, etc.
With variation and modification, in the range of still falling within technical solution of the present invention.
Claims (2)
1. the method for calculating battery capacity by measuring the internal resistance of cell in real time, the measuring method comprise the following steps：
A, by voltage sampling circuit, microcontroller analog-to-digital conversion measures loaded work piece voltage in real time；
B, by current sampling circuit, microcontroller analog-to-digital conversion measures loaded work piece electric current in real time；
C, formula is calculated by the internal resistance of cell and open-circuit voltage and calculates the internal resistance of cell and open-circuit voltage in real time：
D, according to open-circuit voltage and the exact correspondence of battery capacity, real-time battery capacity is drawn exactly；
E, circulating sampling is continuously updated the measurement internal resistance of cell, so as to obtain battery capacity in real time.
2. the method according to claim 1 for calculating battery capacity by measuring the internal resistance of cell in real time, it is characterized in that：In real time
The calculation formula for calculating the internal resistance of cell and open-circuit voltage is：
Internal resistance of cell r=(VRB- VRA)/(IA- IB)
Open-circuit voltage VBAT=(IB*VRA- IA*VRB)/(IB-IA)
Here, open-circuit voltage VBAT,The internal resistance of cell is r,Measuring circuit samples the loaded work piece electric current at A moment,It is denoted as IA；Together
When sample loaded work piece voltage,It is denoted as VRA；Similarly, after a cycle, i.e. B moment（The typical cycle is 1 second, shorter
In cycle time, it is believed that open-circuit voltage VBAT and internal resistance of cell r are constant at this time）, loaded work piece electric current is sampled, is denoted as IB；Together
When, loaded work piece voltage is sampled, is denoted as VRB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986087.3A CN108061856A (en) | 2016-11-09 | 2016-11-09 | The method for calculating battery capacity by measuring the internal resistance of cell in real time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986087.3A CN108061856A (en) | 2016-11-09 | 2016-11-09 | The method for calculating battery capacity by measuring the internal resistance of cell in real time |
Publications (1)
| Publication Number | Publication Date |
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| CN108061856A true CN108061856A (en) | 2018-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610986087.3A Pending CN108061856A (en) | 2016-11-09 | 2016-11-09 | The method for calculating battery capacity by measuring the internal resistance of cell in real time |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655750A (en) * | 2019-01-31 | 2019-04-19 | 北汽福田汽车股份有限公司 | Prediction technique, the prediction meanss of battery life |
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| CN203178367U (en) * | 2012-12-28 | 2013-09-04 | 深圳市沃特玛电池有限公司 | Internal resistance measuring circuit of battery capacity grading cabinet |
| CN103308865A (en) * | 2013-07-09 | 2013-09-18 | 福州瑞芯微电子有限公司 | Method and electric equipment for calculating secondary battery SOC (system on a chip) and self-learning OCV (open circuit voltage)-SOC curve |
| CN103576091A (en) * | 2012-07-19 | 2014-02-12 | 鸿富锦精密工业（深圳）有限公司 | Cell open-circuit voltage compensation system and cell open-circuit voltage compensation method |
| CN103969590A (en) * | 2013-02-05 | 2014-08-06 | 三星Sdi株式会社 | Battery management system and method of using same |
| CN105652212A (en) * | 2016-02-05 | 2016-06-08 | 惠州市蓝微新源技术有限公司 | Method for dynamically detecting consistency of battery pack |
| CN105717458A (en) * | 2016-02-04 | 2016-06-29 | 惠州市蓝微新源技术有限公司 | Online real-time detection method of cell internal resistance |
-
2016
- 2016-11-09 CN CN201610986087.3A patent/CN108061856A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576091A (en) * | 2012-07-19 | 2014-02-12 | 鸿富锦精密工业（深圳）有限公司 | Cell open-circuit voltage compensation system and cell open-circuit voltage compensation method |
| CN203178367U (en) * | 2012-12-28 | 2013-09-04 | 深圳市沃特玛电池有限公司 | Internal resistance measuring circuit of battery capacity grading cabinet |
| CN103969590A (en) * | 2013-02-05 | 2014-08-06 | 三星Sdi株式会社 | Battery management system and method of using same |
| CN103308865A (en) * | 2013-07-09 | 2013-09-18 | 福州瑞芯微电子有限公司 | Method and electric equipment for calculating secondary battery SOC (system on a chip) and self-learning OCV (open circuit voltage)-SOC curve |
| CN105717458A (en) * | 2016-02-04 | 2016-06-29 | 惠州市蓝微新源技术有限公司 | Online real-time detection method of cell internal resistance |
| CN105652212A (en) * | 2016-02-05 | 2016-06-08 | 惠州市蓝微新源技术有限公司 | Method for dynamically detecting consistency of battery pack |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655750A (en) * | 2019-01-31 | 2019-04-19 | 北汽福田汽车股份有限公司 | Prediction technique, the prediction meanss of battery life |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180522 |
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