CN103063925A - Measuring method and device of lithium battery protective plate internal resistance - Google Patents
Measuring method and device of lithium battery protective plate internal resistance Download PDFInfo
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- CN103063925A CN103063925A CN2012105434722A CN201210543472A CN103063925A CN 103063925 A CN103063925 A CN 103063925A CN 2012105434722 A CN2012105434722 A CN 2012105434722A CN 201210543472 A CN201210543472 A CN 201210543472A CN 103063925 A CN103063925 A CN 103063925A
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Abstract
The invention discloses a measuring method and a device of lithium battery protective plate internal resistance. The measuring method and the device of the lithium battery protective plate internal resistance comprises a protective plate, four contacts which are arranged on the protective plate, a microprocessor, a negative feedback constant flow source drive circuit, a voltage difference amplification sampling circuit, a display circuit, a Radio Sonde (RS) 232 communication chip and a computer serial port which is connected with the RS232 communication chip. The negative feedback constant flow source drive circuit, the voltage difference amplification sampling circuit, the display circuit and the RS 232 communication chip are respectively connected with the microprocessor. The contact 1 which is arranged on the protective plate is connected with an internal voltage, the negative feedback constant flow source drive circuit is connected with the contact 2 which is arranged on the protective plate, the voltage difference amplification sampling circuit is connected with the contact 3 and the contact 4, and the contact 3 and the contact 4 are connected with the protective plate. The measuring method and the device of lithium battery protective plate internal resistance adopts a circuit intelligentialized scheme, reduces complexity degree of a virtual circuit, improves precision of the voltage, conducts a plurality of measurements aiming at the protective plates with different internal resistance values, improves precision of measured results, is wide in range of measured results and reduces measurement error.
Description
Technical field
The present invention relates to the lithium battery technical field of measurement and test, relate in particular to a kind of lithium battery protection board internal resistance measurement method and device.
Background technology
In the prior art, the effect of lithium battery protection board is charge and discharge protecting.Can guarantee voltage differences between each cell when being full of electricity less than setting value, realize all filling of each cell of electric battery, effectively improve the charging effect under the serial connection charge mode; Detect simultaneously the overvoltage of each cell in the electric battery, under-voltage, overcurrent, short circuit, over-temperature condition, protection also prolongs battery.Under-voltage protection makes each single battery avoid battery to damage because of overdischarge when discharge is used.Simultaneously, because there is internal resistance in fender, battery protection is produced some negative effects, the utilization rate for more can the Effective Raise lithium battery seems particularly important so measure its internal resistance.
This type of control system or device are disclosed by following patent literature in the prior art.
Chinese invention patent application prospectus CN202351047U has disclosed a kind of scheme of measuring the lithium battery protection board internal resistance; this scheme utilization only provides single constant current source; thereby can only be for the resistance test of 50-500 milliohm scope; in case the internal resistance of lithium battery protection board is higher or lower than 50-500 milliohm scope; then measurement result is inaccurate, error is large, can not satisfy the needs of actual measurement.
Chinese utility model patent ublic specification of application CN201532446U has disclosed a kind of scheme of internal resistance of cell test, this scheme utilizes the AC power calculating mean value to measure internal resistance value, because there is peak value in alternating current, there is certain error by formula calculating, and the sinewave output end reads the internal resistance value inconvenience, mistake easily occurs, cause measurement result inaccurate, can not satisfy the needs of actual measurement.
Summary of the invention
Technical matters to be solved by this invention provides the lithium battery protection board internal resistance measurement device that a kind of measurement range is wide, precision is high.
For achieving the above object, the invention provides following technical scheme: a kind of lithium battery protection board internal resistance measurement method, be used for measuring the lithium battery protection board internal resistance value, comprise microprocessor, described microprocessor connects the digital-to-analogue conversion block, described digital-to-analog conversion piece connects driving circuit, and described driving circuit connects fender; Described fender connects respectively current acquisition piece and voltage acquisition piece, and described current acquisition piece connects the first analog to digital conversion piece, and described the first analog to digital conversion piece connects microprocessor; Described voltage acquisition piece connects the second analog to digital conversion piece, and described the second analog to digital conversion piece connects microprocessor; Described microprocessor PORT COM connecting communication piece, described communication piece connects serial ports of computers.
Preferably, described current acquisition piece comprises the current following filtering circuit.
Preferably, described voltage acquisition piece comprises the voltage follow differential amplifier circuit.
Preferably, described microprocessor also connects displaying block.
Preferably, described microprocessor can arrange different parameters, and described serial ports of computers can be inputted different parameters to microprocessor.
Described a kind of lithium battery protection board internal resistance measurement method, its core is microprocessor, is responsible for input, output, calculating and the control of data.
Driving circuit is to be responsible for receiving the microprocessor output signal, produces constant current source.
The current acquisition piece is to be responsible for receiving the electric current that fender produces.
The voltage acquisition piece is to be responsible for receiving the voltage that fender produces.
The digital-to-analog conversion piece is to be responsible for the digital signal of microprocessor input is converted into the receivable simulating signal of mimic channel.
The first analog to digital conversion piece, the second analog to digital conversion piece is responsible for the simulating signal that mimic channel produces is converted into the receivable digital signal of microprocessor.
Serial ports of computers is to be responsible for to microprocessor input signal parameter.
Displaying block is the result of calculation of being responsible for showing microprocessor, shows fender internal resistance value numerical value.
The present invention also provides a kind of lithium battery protection board internal resistance measurement device, comprise fender, fender be provided with four contacts, microprocessor, with negative feedback constant current source driving circuit, voltage differential amplification sample circuit, display circuit, RS232 communication chip and the serial ports of computers that is connected with the RS232 communication chip that microprocessor is connected respectively, the contact on the described fender " 1 " connects builtin voltage; Described negative feedback constant current source driving circuit connects the contact " 2 " on the fender; Described negative feedback constant current source driving circuit comprises the constant current source driving circuit that is connected with output end of microprocessor and the feedback current sample circuit that is connected with the microprocessor input end; Described constant current source driving circuit is provided with the NPN triode, and described NPN triode below is provided with stake resistance; Described voltage differential amplification sample circuit connects contact " 3 ", " 4 " on the fender; Described voltage differential amplification sample circuit connects the microprocessor input end.
Preferably, described microprocessor adopts STM32F103VET6 model single-chip microcomputer.
Preferably, described display circuit comprises four charactrons that are connected with microprocessor.
Preferably, described constant current source driving circuit is provided with DA and transforms chip, and described negative feedback current sample circuit is provided with AD and transforms chip one; Described voltage differential amplification sample circuit is provided with AD and transforms chip two.
Described a kind of lithium battery protection board internal resistance measurement device, its core is microprocessor, is responsible for input, output, calculating and the control of data.
The negative feedback constant current source driving circuit is to be responsible for receiving the microprocessor output signal, produces constant current source, and the current signal that fender is produced is input in the microprocessor.
Voltage differential amplification sample circuit is to be responsible for receiving the voltage that fender produces, and processes voltage, is input in the microprocessor.
The voltage acquisition piece is to be responsible for receiving the voltage that fender produces.
Serial ports of computers is to be responsible for to microprocessor input signal parameter.
Display circuit is the result of calculation of being responsible for showing microprocessor, shows fender internal resistance value numerical value.
Adopt the beneficial effect of above technical scheme to be: the present invention adopts the Circuit Intelligent scheme; reduce the mimic channel complexity; utilize microprocessor constant current source to be provided and to gather electric current on the fender to the fender pair of contact; another is to the voltage on the contact collection fender; the voltage stabilization that keeps collection by differential amplifier circuit; without interruption; put forward high-tension degree of accuracy; microprocessor will gather the voltage and current that comes and utilize the internal arithmetic device to draw the fender internal resistance value; show internal resistance value numerical value by charactron; microprocessor also connects serial ports of computers can input the different parameters change; repeatedly measure for different internal resistance value fenders; improve the measurement result degree of accuracy; scope is wide, reduces measuring error.
Description of drawings
Fig. 1 is the process flow diagram of fender internal resistance measurement method of the present invention;
Fig. 2 is the circuit diagram of fender internal resistance measurement device of the present invention;
Wherein, 1-fender, 2-microprocessor; 3-digital-to-analog conversion piece, 4-driving circuit, 5-current acquisition piece; 6-voltage acquisition piece, 7-the first analog to digital conversion piece, 8-the second analog to digital conversion piece; 9-communication piece, 10-serial ports of computers, 11-displaying block; 12-negative feedback constant current source driving circuit; 13-voltage differential amplification sample circuit, 14-display circuit, 15-RS232 communication chip.
Embodiment
In order to deepen the understanding of the present invention, the invention will be further described below in conjunction with embodiment and accompanying drawing, and this embodiment only is used for explaining the present invention, does not consist of the restriction to protection domain of the present invention.
Describe preferred implementation of the present invention in detail below in conjunction with accompanying drawing 1 and accompanying drawing 2: a kind of lithium battery protection board internal resistance measurement method, be used for measuring lithium battery protection board 1 internal resistance value, comprise microprocessor 2, connect digital-to-analogue conversion block 3 at microprocessor 2, connect driving circuit 4 at digital-to-analog conversion piece 3, driving circuit 4 connects fender 1; Connect respectively current acquisition piece 5 and voltage acquisition piece 6 at fender 1, current acquisition piece 5 connects the first analog to digital conversion piece 7, the first analog to digital conversion pieces 7 and connects microprocessor 2; Described voltage acquisition piece 6 connects the second analog to digital conversion piece 8, and described the second analog to digital conversion piece 8 connects microprocessor 2; Microprocessor 2 PORT COM connecting communication pieces 9, connect serial ports of computers 10 at communication piece 9, current acquisition piece 5 comprises the current following filtering circuit, voltage acquisition piece 6 comprises the voltage follow differential amplifier circuit, microprocessor 2 also connects displaying block 11, microprocessor 2 can arrange different parameters, can be to microprocessor 2 input different parameters at serial ports of computers 11.
Digital-to-analog conversion piece 3 changes into simulating signal with the digital signal of microprocessor 2 outputs, becomes driving circuit 4 input signal sources; The first analog to digital conversion piece 7 and the second analog to digital conversion piece 8 change into digital signal with simulating signal, are input to microprocessor 2.
The electric current that current acquisition piece 5 gathers on the fenders 1 is I, and to be input to microprocessor 2 current signals be I by following filtering circuit and the first analog to digital conversion piece 7.
The voltage that voltage acquisition piece 6 gathers on the fenders 1 is U, and to be input to microprocessor 2 voltage signals be U by following differential amplifier circuit and the second analog to digital conversion piece 8.
A kind of lithium battery protection board internal resistance measurement device, comprise fender 1, fender 1 be provided with four contacts, microprocessor 2, with negative feedback constant current source driving circuit 12, voltage differential amplification sample circuit 13, display circuit 14, RS232 communication chip 15 and the serial ports of computers 10 that is connected with RS232 communication chip 15 that microprocessor 2 is connected respectively, the contact on fender 1 " 1 " connects builtin voltage; The contact " 2 " that negative feedback constant current source driving circuit 12 connects on the fender 1; Negative feedback constant current source driving circuit 12 comprises the constant current source driving circuit that is connected with microprocessor 2 output terminals and the negative feedback current sample circuit that is connected with microprocessor 2 input ends; Constant current source driving circuit is provided with the NPN triode, and NPN triode below is provided with stake resistance; Contact " 3 ", " 4 " that voltage differential amplification sample circuit 4 connects on the fender; Voltage differential amplification sample circuit 13 connects microprocessor 2 input ends; Microprocessor 2 adopts STM32F103VET6 model single-chip microcomputer; Display circuit 14 comprises four charactrons that are connected with microprocessor 2; Be provided with DA at constant current source driving circuit and transform chip, be provided with AD at the negative feedback current sample circuit and transform chip one; Be provided with AD at voltage differential amplification sample circuit 13 and transform chip two.
The DA conversion chip changes into simulating signal with the digital signal of microprocessor 2 outputs, becomes the constant current source driving circuit input signal source; AD conversion chip one and AD conversion chip two change into digital signal with simulating signal, are input to microprocessor 2.
Electric current on the negative feedback current sample circuit is I, and to be input to microprocessor 2 current signals be I by following filtering circuit and AD conversion chip one.
The voltage that voltage differential amplification sample circuit 13 gathers on the fenders 1 is U, and to be input to microprocessor 2 voltage signals be U by following differential amplifier circuit and AD conversion chip two.
Adopt the beneficial effect of above technical scheme to be: the present invention adopts the Circuit Intelligent scheme; constant current source is provided and reads voltage and current parameter and finish by microprocessor; modulus signal transforms all uses DA conversion chip or AD conversion chip to finish; reduce the mimic channel complexity; utilize microprocessor constant current source to be provided and to gather electric current on the fender to the fender pair of contact; another is to the voltage on the contact collection fender; the voltage stabilization that keeps collection by differential amplifier circuit; amplify; improve the voltage signal impedance; drop to the external circuit interference minimum; put forward high-tension degree of accuracy; microprocessor will gather the voltage and current that comes and utilize the internal arithmetic device to draw the fender internal resistance value; show internal resistance value numerical value by charactron, be accurate to 2 significant digits, make reading more accurate; easy; microprocessor also connects serial ports of computers can input the different parameters change; repeatedly measure for different internal resistance value fenders, increase lithium battery protection board internal resistance measurement scope, reduce measuring error.
Above-described only is preferred implementation of the present invention, should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the invention design, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (9)
1. lithium battery protection board internal resistance measurement method, be used for measuring the lithium battery protection board internal resistance value, it is characterized in that: comprise microprocessor, described microprocessor connects the digital-to-analogue conversion block, described digital-to-analog conversion piece connects driving circuit, and described driving circuit connects fender; Described fender connects respectively current acquisition piece and voltage acquisition piece, and described current acquisition piece connects the first analog to digital conversion piece, and described the first analog to digital conversion piece connects microprocessor; Described voltage acquisition piece connects the second analog to digital conversion piece, and described the second analog to digital conversion piece connects microprocessor; Described microprocessor PORT COM connecting communication piece, described communication piece connects serial ports of computers.
2. a kind of lithium battery protection board internal resistance measurement method according to claim 1, it is characterized in that: described current acquisition piece comprises the current following filtering circuit.
3. a kind of lithium battery protection board internal resistance measurement method according to claim 1, it is characterized in that: described voltage acquisition piece comprises the voltage follow differential amplifier circuit.
4. a kind of lithium battery protection board internal resistance measurement method according to claim 1, it is characterized in that: described microprocessor also connects displaying block.
5. the described a kind of lithium battery protection board internal resistance measurement method of any one according to claim 1-4, it is characterized in that: described microprocessor can arrange different parameters, and described serial ports of computers can be inputted different parameters to microprocessor.
6. lithium battery protection board internal resistance measurement device, comprise fender, fender be provided with four contacts, microprocessor, with negative feedback constant current source driving circuit, voltage differential amplification sample circuit, display circuit, RS232 communication chip and the serial ports of computers that is connected with the RS232 communication chip that microprocessor is connected respectively, it is characterized in that: the contact on the described fender " 1 " connects builtin voltage; Described negative feedback constant current source driving circuit connects the contact " 2 " on the fender; Described negative feedback constant current source driving circuit comprises the constant current source driving circuit that is connected with output end of microprocessor and the negative feedback current sample circuit that is connected with the microprocessor input end; Described constant current source driving circuit is provided with the NPN triode, and described NPN triode below is provided with stake resistance; Described voltage differential amplification sample circuit connects contact " 3 ", " 4 " on the fender; Described voltage differential amplification sample circuit connects the microprocessor input end.
7. a kind of lithium battery protection board internal resistance measurement device according to claim 6 is characterized in that: described microprocessor employing STM32F103VET6 model single-chip microcomputer.
8. a kind of lithium battery protection board internal resistance measurement device according to claim 6, it is characterized in that: described display circuit comprises four charactrons that are connected with microprocessor.
9. a kind of lithium battery protection board internal resistance measurement device according to claim 6 is characterized in that: described constant current source driving circuit is provided with DA and transforms chip, and described negative feedback current sample circuit is provided with AD and transforms chip one; Described voltage differential amplification sample circuit is provided with AD and transforms chip two.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210543472.2A CN103063925B (en) | 2012-12-14 | 2012-12-14 | A kind of lithium battery protection board internal resistance measurement method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210543472.2A CN103063925B (en) | 2012-12-14 | 2012-12-14 | A kind of lithium battery protection board internal resistance measurement method and device |
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| CN103063925A true CN103063925A (en) | 2013-04-24 |
| CN103063925B CN103063925B (en) | 2016-10-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020006749A1 (en) * | 2018-07-06 | 2020-01-09 | 深圳市汇顶科技股份有限公司 | Chip impedance testing method and system |
| CN112986635A (en) * | 2019-12-18 | 2021-06-18 | 上海比亚迪有限公司 | Programmable electronic load and battery testing device |
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| CN2138795Y (en) * | 1992-08-05 | 1993-07-21 | 杨意逢 | Inductance inner resistance fast measurer |
| US20090224771A1 (en) * | 2008-03-05 | 2009-09-10 | Liebert Corporation | System and method for measuring battery internal resistance |
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| CN201788265U (en) * | 2010-03-10 | 2011-04-06 | 深圳市恒翼能科技有限公司 | Tester for battery protection board |
| CN102096001A (en) * | 2010-12-20 | 2011-06-15 | 惠州市蓝微电子有限公司 | Overcurrent and short circuit tester for battery pack protective board |
| CN202956434U (en) * | 2012-12-14 | 2013-05-29 | 芜湖天元汽车电子有限公司 | Internal resistance measuring device of lithium battery protection plate |
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2012
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2138795Y (en) * | 1992-08-05 | 1993-07-21 | 杨意逢 | Inductance inner resistance fast measurer |
| US20090224771A1 (en) * | 2008-03-05 | 2009-09-10 | Liebert Corporation | System and method for measuring battery internal resistance |
| CN201788265U (en) * | 2010-03-10 | 2011-04-06 | 深圳市恒翼能科技有限公司 | Tester for battery protection board |
| CN101806865A (en) * | 2010-03-29 | 2010-08-18 | 深圳睿立方智能科技有限公司 | Detection device of internal resistance of cell and detection method thereof |
| CN102096001A (en) * | 2010-12-20 | 2011-06-15 | 惠州市蓝微电子有限公司 | Overcurrent and short circuit tester for battery pack protective board |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020006749A1 (en) * | 2018-07-06 | 2020-01-09 | 深圳市汇顶科技股份有限公司 | Chip impedance testing method and system |
| CN112986635A (en) * | 2019-12-18 | 2021-06-18 | 上海比亚迪有限公司 | Programmable electronic load and battery testing device |
| CN112986635B (en) * | 2019-12-18 | 2023-04-07 | 上海比亚迪有限公司 | Programmable electronic load and battery testing device |
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| Publication number | Publication date |
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| CN103063925B (en) | 2016-10-05 |
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