CN103063925B - A kind of lithium battery protection board internal resistance measurement method and device - Google Patents
A kind of lithium battery protection board internal resistance measurement method and device Download PDFInfo
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- CN103063925B CN103063925B CN201210543472.2A CN201210543472A CN103063925B CN 103063925 B CN103063925 B CN 103063925B CN 201210543472 A CN201210543472 A CN 201210543472A CN 103063925 B CN103063925 B CN 103063925B
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Abstract
The invention discloses a kind of lithium battery protection board internal resistance measurement method and device; including protection board, on protection board, be provided with four contacts, negative feedback constant current source driving circuit that microprocessor is connected respectively with microprocessor, voltage differential amplify sample circuit, display circuit, RS232 communication chip and the serial ports of computers being connected with RS232 communication chip, contact " 1 " the connection builtin voltage on protection board；Negative feedback constant current source driving circuit connects the contact " 2 " on protection board, and voltage differential amplifies sample circuit and connects the contact " 3 " on protection board, " 4 "；The present invention uses Circuit Intelligent scheme, reduces analog circuit complexity, puies forward high-tension degree of accuracy, for different internal resistance value protection board repetitive measurement, improves measurement result degree of accuracy, scope extensively, reduces measurement error.
Description
Technical field
The present invention relates to lithium battery technical field of measurement and test, particularly relate to a kind of lithium battery protection board internal resistance measurement method and device.
Background technology
In prior art, the effect of lithium battery protection board is charge and discharge protecting.Can guarantee that time fully charged that voltage differences between each cell is less than setting value, it is achieved all filling of each cell of set of cells, effectively improve the charging effect under serial connection charge mode；The overvoltage of each cell in detection set of cells simultaneously, under-voltage, mistake stream, short-circuit, over-temperature condition, protect and extend battery.Under-voltage protection makes each single battery avoid battery to damage because of overdischarge when electric discharge uses.Simultaneously as protection board exists internal resistance, battery protection is produced some negative effects, in order to the utilization rate of lithium battery more can be effectively improved, so the internal resistance measuring it is particularly important.
In prior art, this type of control system or device are disclosed by following patent literature.
Chinese invention patent application prospectus CN202351047U discloses a kind of scheme measuring lithium battery protection board internal resistance; the program utilizes and provides only single constant-current source; thus can only be for the resistance test of 50-500 milliohm scope; once the internal resistance of lithium battery protection board is higher or lower than 50-500 milliohm scope; then measurement result is inaccurate, error big, can not meet the needs of actual measurement.
Chinese utility model patent ublic specification of application CN201532446U discloses the scheme of a kind of internal resistance of cell test, the program utilizes alternating current power supply to calculate measurement of average value internal resistance value, owing to alternating current exists peak value, calculated by formula and there is certain error, and sinewave output end reads internal resistance value inconvenience, mistake easily occurs, causes measurement result inaccurate, it is impossible to meet the needs that reality is measured.
Summary of the invention
The technical problem to be solved is to provide a kind of measures the lithium battery protection board internal resistance measurement device that scope is wide, precision is high.
For achieving the above object; the present invention provides following technical scheme: a kind of lithium battery protection board internal resistance measurement method; for measuring lithium battery protection board internal resistance value; including microprocessor; described microprocessor connects digital-to-analogue conversion block; described digital-to-analogue conversion block connects drive circuit, and described drive circuit connects protection board；Described protection board connects current acquisition block and voltage acquisition block respectively, and described current acquisition block connects the first analog digital conversion block, and described first analog digital conversion block connects microprocessor；Described voltage acquisition block connects the second analog digital conversion block, and described second analog digital conversion block connects microprocessor；Described microprocessor communications port connecting communication block, described communication block connects serial ports of computers.
Preferably, described current acquisition block comprises current following filter circuit.
Preferably, described voltage acquisition block comprises voltage follow differential amplifier circuit.
Preferably, described microprocessor is also connected with displaying block.
Preferably, described microprocessor can arrange different parameters, and described serial ports of computers can input different parameters to microprocessor.
Described a kind of lithium battery protection board internal resistance measurement method, its core is microprocessor, is responsible for the input of data, exports, calculates and control.
Drive circuit is responsible for receiving microprocessor output signal, produces constant-current source.
Current acquisition block is responsible for receiving the electric current that protection board produces.
Voltage acquisition block is responsible for receiving the voltage that protection board produces.
The digital signal that digital-to-analogue conversion block is responsible for microprocessor inputs is converted into the receivable analogue signal of analog circuit.
First analog digital conversion block, the second analog digital conversion block, it is responsible for the analogue signal by analog circuit produces and is converted into the receivable digital signal of microprocessor.
Serial ports of computers is responsible for microprocessor input signal parameter.
Displaying block is responsible for showing the result of calculation of microprocessor, shows protection board internal resistance value numerical value.
The present invention also provides for a kind of lithium battery protection board internal resistance measurement device; including protection board, on protection board, be provided with four contacts, negative feedback constant current source driving circuit that microprocessor is connected respectively with microprocessor, voltage differential amplify sample circuit, display circuit, RS232 communication chip and the serial ports of computers being connected with RS232 communication chip, contact " 1 " the connection builtin voltage on described protection board；Described negative feedback constant current source driving circuit connects the contact " 2 " on protection board；Described negative feedback constant current source driving circuit includes the constant current source driving circuit being connected with output end of microprocessor and the feedback current sample circuit being connected with microprocessor input；Described constant current source driving circuit is provided with NPN audion, is provided with earth resistance below described NPN triode；Described voltage differential amplifies sample circuit and connects the contact " 3 " on protection board, " 4 "；Described voltage differential amplifies sample circuit and connects microprocessor input.
Preferably, described microprocessor uses STM32F103VET6 model single-chip microcomputer.
Preferably, described display circuit includes four charactrons being connected with microprocessor.
Preferably, described constant current source driving circuit is provided with DA conversion chip, and described negative feedback current sample circuit is provided with AD conversion chip one；Described voltage differential amplifies sample circuit and is provided with AD conversion chip two.
Described a kind of lithium battery protection board internal resistance measurement device, its core is microprocessor, is responsible for the input of data, exports, calculates and control.
Negative feedback constant current source driving circuit is responsible for receiving microprocessor output signal, produces constant-current source, is input in microprocessor by the current signal that protection board produces.
Voltage differential amplifies sample circuit and is responsible for receiving the voltage that protection board produces, and processes voltage, is input in microprocessor.
Voltage acquisition block is responsible for receiving the voltage that protection board produces.
Serial ports of computers is responsible for microprocessor input signal parameter.
Display circuit is responsible for showing the result of calculation of microprocessor, shows protection board internal resistance value numerical value.
Above technical scheme is used to provide the benefit that: the present invention uses Circuit Intelligent scheme, reduce analog circuit complexity, microprocessor is utilized to provide constant-current source the electric current gathering on protection board to protection board pair of contact, another pair of contact gathers the voltage on protection board, the voltage stabilization gathered is kept by differential amplifier circuit, without interruption, put forward high-tension degree of accuracy, microprocessor utilizes internal arithmetic device to draw protection board internal resistance value by gathering the voltage and current come, by numeral method internal resistance value numerical value, microprocessor is also connected with serial ports of computers can input different parameters change, for different internal resistance value protection board repetitive measurement, improve measurement result degree of accuracy, scope is wide, reduce measurement error.
Accompanying drawing explanation
Fig. 1 is the flow chart of the protection board internal resistance measurement method of the present invention；
Fig. 2 is the circuit diagram of the protection board internal resistance measurement device of the present invention；
Wherein, 1-protection board, 2-microprocessor; 3-digital-to-analogue conversion block, 4-drive circuit, 5-current acquisition block; 6-voltage acquisition block, 7-the first analog digital conversion block, 8-the second analog digital conversion block; 9-communication block, 10-serial ports of computers, 11-displaying block; 12-negative feedback constant current source driving circuit; 13-voltage differential amplifies sample circuit, 14-display circuit, 15-RS232 communication chip.
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described, and this embodiment is only used for explaining the present invention, is not intended that limiting the scope of the present invention.
Below in conjunction with the accompanying drawings 1 and accompanying drawing 2 describe the preferred embodiment of the present invention in detail: a kind of lithium battery protection board internal resistance measurement method; for measuring lithium battery protection board 1 internal resistance value; including microprocessor 2; digital-to-analogue conversion block 3 is connected at microprocessor 2; connecting drive circuit 4 at digital-to-analogue conversion block 3, drive circuit 4 connects protection board 1；Connecting current acquisition block 5 and voltage acquisition block 6 respectively at protection board 1, current acquisition block 5 connects the first analog digital conversion block 7, and the first analog digital conversion block 7 connects microprocessor 2；Described voltage acquisition block 6 connects the second analog digital conversion block 8, and described second analog digital conversion block 8 connects microprocessor 2；Microprocessor 2 PORT COM connecting communication block 9, serial ports of computers 10 is connected at communication block 9, current acquisition block 5 comprises current following filter circuit, voltage acquisition block 6 comprises voltage follow differential amplifier circuit, microprocessor 2 is also connected with displaying block 11, microprocessor 2 can arrange different parameters, can input different parameters to microprocessor 2 at serial ports of computers 11.
The digital signal that microprocessor 2 exports is changed into analogue signal by digital-to-analogue conversion block 3, becomes drive circuit 4 input signal source；Analogue signal is changed into digital signal by the first analog digital conversion block 7 and the second analog digital conversion block 8, is input to microprocessor 2.
It is I that current acquisition block 5 gathers the electric current on protection board 1, by follow filter circuit and the first analog digital conversion block 7 to be input to microprocessor 2 current signal be I.
It is U that voltage acquisition block 6 gathers the voltage on protection board 1, by follow differential amplifier circuit and the second analog digital conversion block 8 to be input to microprocessor 2 voltage signal be U.
By internal calculation, microprocessor 2 show that R=U/I, protection board 1 internal resistance value R are by displaying block 11.
A kind of lithium battery protection board internal resistance measurement device; including protection board 1, on protection board 1, be provided with four contacts, negative feedback constant current source driving circuit 12 that microprocessor 2 is connected respectively with microprocessor 2, voltage differential amplify sample circuit 13, display circuit 14, RS232 communication chip 15 and the serial ports of computers 10 being connected with RS232 communication chip 15, contact " 1 " the connection builtin voltage on protection board 1；Negative feedback constant current source driving circuit 12 connects the contact " 2 " on protection board 1；Negative feedback constant current source driving circuit 12 includes the constant current source driving circuit being connected with microprocessor 2 outfan and the negative feedback current sample circuit being connected with microprocessor 2 input；Constant current source driving circuit is provided with NPN audion, is provided with earth resistance below NPN triode；Voltage differential amplifies sample circuit 4 and connects the contact " 3 " on protection board, " 4 "；Voltage differential amplifies sample circuit 13 and connects microprocessor 2 input；Microprocessor 2 uses STM32F103VET6 model single-chip microcomputer；Display circuit 14 includes four charactrons being connected with microprocessor 2；Constant current source driving circuit is provided with DA conversion chip, negative feedback current sample circuit is provided with AD conversion chip one；Amplify at voltage differential and be provided with AD conversion chip two on sample circuit 13.
The digital signal that microprocessor 2 exports is changed into analogue signal by DA conversion chip, becomes constant current source driving circuit input signal source；Analogue signal is changed into digital signal by AD conversion chip one and AD conversion chip two, is input to microprocessor 2.
Electric current on negative feedback current sample circuit is I, by follow filter circuit and AD conversion chip one to be input to microprocessor 2 current signal be I.
Voltage differential amplifies sample circuit 13, and to gather the voltage on protection board 1 be U, by follow differential amplifier circuit and AD conversion chip two to be input to microprocessor 2 voltage signal be U.
By internal calculation, microprocessor 2 show that R=U/I, protection board 1 internal resistance value R are by display circuit 14.
nullAbove technical scheme is used to provide the benefit that: the present invention uses Circuit Intelligent scheme，Constant-current source and read voltage current parameters is provided to be completed by microprocessor，Modulus signal converts and all uses DA conversion chip or AD conversion chip to complete，Reduce analog circuit complexity，Microprocessor is utilized to provide constant-current source the electric current gathering on protection board to protection board pair of contact，Another pair of contact gathers the voltage on protection board，The voltage stabilization gathered is kept by differential amplifier circuit、Amplify，Improve voltage signal impedance，External circuit interference is preferably minimized，Put forward high-tension degree of accuracy，Microprocessor utilizes internal arithmetic device to draw protection board internal resistance value by gathering the voltage and current come，By numeral method internal resistance value numerical value，It is accurate to 2 significant digits，Make reading the most accurate、Easy，Microprocessor is also connected with serial ports of computers can input different parameters change，For different internal resistance value protection board repetitive measurement，Increase lithium battery protection board internal resistance measurement scope，Reduce measurement error.
Above-described is only the preferred embodiment of the present invention, it is noted that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, it is also possible to make some deformation and improvement, these broadly fall into protection scope of the present invention.
Claims (2)
1. a lithium battery protection board internal resistance measurement method; for measuring lithium battery protection board internal resistance value; it is characterized in that: use microprocessor; described microprocessor connects digital-to-analogue conversion block; described digital-to-analogue conversion block connects drive circuit; described drive circuit is responsible for receiving microprocessor output signal, produces constant-current source, and described drive circuit connects protection board；Described protection board connects current acquisition block and voltage acquisition block respectively, and described current acquisition block connects the first analog digital conversion block, and described first analog digital conversion block connects microprocessor；Described voltage acquisition block connects the second analog digital conversion block, and described second analog digital conversion block connects microprocessor；Described microprocessor communications port connecting communication block, described communication block connects serial ports of computers；Described current acquisition block comprises current following filter circuit；Described voltage acquisition block comprises voltage follow differential amplifier circuit；Described microprocessor is also connected with displaying block；Described microprocessor can arrange different parameters, and described serial ports of computers can input different parameters to microprocessor.
2. a lithium battery protection board internal resistance measurement device; the negative feedback constant current source driving circuit, the voltage differential that including microprocessor and are connected respectively with microprocessor amplify sample circuit, display circuit, RS232 communication chip; and the serial ports of computers being connected with RS232 communication chip; it is characterized in that: be provided with four contacts on protection board, the contact " 1 " on described protection board connects VDD；Described negative feedback constant current source driving circuit connects the contact " 2 " on protection board；Described negative feedback constant current source driving circuit includes the constant current source driving circuit being connected with output end of microprocessor and the negative feedback current sample circuit being connected with microprocessor input；Described constant current source driving circuit is provided with NPN audion, and described NPN triode emitter stage connects earth resistance；Described voltage differential amplifies the input of sample circuit and connects the contact " 3 " on protection board, " 4 "；Described voltage differential amplifies the outfan of sample circuit and connects microprocessor input；Described microprocessor uses STM32F103VET6 model single-chip microcomputer；Described display circuit includes four charactrons being connected with microprocessor；Described constant current source driving circuit is provided with DA conversion chip, and described negative feedback current sample circuit is provided with AD conversion chip one；Described voltage differential amplifies sample circuit and is provided with AD conversion chip two.
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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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| 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 CN103063925A (en) | 2013-04-24 |
| CN103063925B true CN103063925B (en) | 2016-10-05 |
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| 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 |
| 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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| CN2138795Y (en) * | 1992-08-05 | 1993-07-21 | 杨意逢 | Inductance inner resistance fast measurer |
| US8063643B2 (en) * | 2008-03-05 | 2011-11-22 | 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 |
| CN101806865B (en) * | 2010-03-29 | 2013-04-17 | 深圳睿立方智能科技有限公司 | Detection device of internal resistance of cell |
| CN102096001B (en) * | 2010-12-20 | 2013-04-17 | 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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