CN202956434U - Internal resistance measuring device of lithium battery protection plate - Google Patents
Internal resistance measuring device of lithium battery protection plate Download PDFInfo
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- CN202956434U CN202956434U CN 201220693797 CN201220693797U CN202956434U CN 202956434 U CN202956434 U CN 202956434U CN 201220693797 CN201220693797 CN 201220693797 CN 201220693797 U CN201220693797 U CN 201220693797U CN 202956434 U CN202956434 U CN 202956434U
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- constant current
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Abstract
The utility model discloses an internal resistance measuring device of a lithium battery protection plate. The device comprises a protection plate, wherein four contacts, a microprocessor, a negative feedback constant current source driving circuit, a voltage differential amplification sampling circuit, a display circuit, a recommended standard (RS) 232 communication chip and a computer serial port are arranged on the protection plate; the negative feedback constant current source driving circuit, the voltage differential amplification sampling circuit, the display circuit and the RS232 communication chip are respectively connected with the microprocessor; the computer serial port is connected with the RS232 communication chip; the first contact on the protection plate is connected with internal voltage; the negative feedback constant current source driving circuit is connected with the second contact on the protection plate; and the voltage differential amplification sampling circuit is connected with the third and fourth contacts on the protection plate. By adoption of a circuit intelligent scheme, the complexity of an analog circuit is reduced, the accuracy of voltage is improved, the protection plate with different internal resistance values is repeatedly measured, the accuracy of a measurement result is improved, the range of the measurement result is expanded, and measurement errors are reduced.
Description
Technical field
The utility model relates to the lithium battery technical field of measurement and test, relates in particular to a kind of lithium battery protection board internal resistance measurement device.
Background technology
In prior art, the effect of lithium battery protection board is charge and discharge protecting.Can guarantee while being full of electricity that the voltage differences between each cell is 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 the overvoltage of each cell in electric battery, under-voltage, overcurrent, short circuit, over-temperature condition simultaneously, protect and extend battery.Under-voltage protection makes each single battery avoid battery to damage because of overdischarge when electric discharge is used.Simultaneously, because there is internal resistance in fender, battery protection is produced to some negative effects, in order more effectively to improve the utilization rate of lithium battery, so measure its internal resistance, seem particularly important.
In prior art, this type of control system or device are disclosed by following patent literature.
Chinese utility model patent ublic specification of application 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; once the internal resistance of lithium battery protection board is higher or lower than 50-500 milliohm scope; measurement result is inaccurate, error is large, can not meet 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, calculate and have certain error by formula, and the sinewave output end reads the internal resistance value inconvenience, mistake easily occurs, cause measurement result inaccurate, can not meet the needs of actual measurement.
The utility model content
Technical problem to be solved in the utility model is to provide 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 utility model provides following technical scheme: a kind of lithium battery protection board internal resistance measurement device, comprise fender, be provided with four contacts on fender, microprocessor, the negative feedback constant current source driving circuit be connected respectively with microprocessor, voltage differential amplification sample circuit, display circuit, RS232 communication chip and the serial ports of computers be connected with the RS232 communication chip, the contact on described fender " 1 " connects builtin voltage; Described negative feedback constant current source driving circuit connects the contact " 2 " on fender; Described negative feedback constant current source driving circuit comprises the constant current source driving circuit be connected with output end of microprocessor and the feedback current sample circuit be 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 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 microprocessor.
Voltage differential amplification sample circuit is to be responsible for receiving the voltage that fender produces, and processes voltage, is input in 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 utility model adopts the Circuit Intelligent scheme, reduce the mimic channel complexity, utilize microprocessor constant current source to be provided and to gather the electric current on fender to the fender pair of contact, another gathers the voltage on fender to contact, keep the voltage stabilization gathered by differential amplifier circuit, without interruption, put forward high-tension degree of accuracy, microprocessor will gather the voltage and current come 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, for different internal resistance value fenders, repeatedly measure, improve the measurement result degree of accuracy, scope is wide, reduce measuring error.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of fender internal resistance measurement device of the present utility model;
Wherein, 1-fender, 2-microprocessor, 10-serial ports of computers, 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 understanding of the present utility model, below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, and this embodiment only, for explaining the utility model, does not form the restriction to the utility model protection domain.
Describe preferred implementation of the present utility model in detail below in conjunction with accompanying drawing 1:
A kind of lithium battery protection board internal resistance measurement device, comprise fender 1, be provided with four contacts on fender 1, microprocessor 2, the negative feedback constant current source driving circuit 12 be connected respectively with microprocessor 2, voltage differential amplification sample circuit 13, display circuit 14, RS232 communication chip 15 and the serial ports of computers 10 be connected with RS232 communication chip 15, the contact on fender 1 " 1 " connects builtin voltage; The contact " 2 " that negative feedback constant current source driving circuit 12 connects on fender 1; Negative feedback constant current source driving circuit 12 comprises the constant current source driving circuit be connected with microprocessor 2 output terminals and the negative feedback current sample circuit be 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 13 connects on 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 and transform chip on constant current source driving circuit, be provided with AD and transform chip one on the negative feedback current sample circuit; Be provided with AD and transform chip two on voltage differential amplification sample circuit 13.
The DA conversion chip changes into simulating signal by 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 by simulating signal, are input to microprocessor 2.
Electric current on the negative feedback current sample circuit is I, and by following filtering circuit and AD conversion chip one, to be input to microprocessor 2 current signals be I.
The voltage that voltage differential amplification sample circuit 13 gathers on fenders 1 is U, and by following differential amplifier circuit and AD conversion chip two, to be input to microprocessor 2 voltage signals be U.
Adopt the beneficial effect of above technical scheme to be: the utility model adopts the Circuit Intelligent scheme, constant current source is provided and reads voltage and current parameter and complete by microprocessor, modulus signal transforms all uses DA conversion chip or AD conversion chip to complete, reduce the mimic channel complexity, utilize microprocessor constant current source to be provided and to gather the electric current on fender to the fender pair of contact, another gathers the voltage on fender to contact, keep the voltage stabilization gathered by differential amplifier circuit, amplify, improve the voltage signal impedance, by the external circuit interference, drop to minimum, put forward high-tension degree of accuracy, microprocessor will gather the voltage and current come 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, for different internal resistance value fenders, repeatedly measure, increase lithium battery protection board internal resistance measurement scope, reduce measuring error.
Above-described is only preferred implementation of the present utility model; it should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model creation design; can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (4)
1. a lithium battery protection board internal resistance measurement device, comprise fender, at fender, be provided with four contacts, microprocessor, the negative feedback constant current source driving circuit be connected respectively with microprocessor, voltage differential amplification sample circuit, display circuit, RS232 communication chip and the serial ports of computers be connected with the RS232 communication chip, it is characterized in that: the contact on described fender " 1 " connects builtin voltage; Described negative feedback constant current source driving circuit connects the contact " 2 " on fender; Described negative feedback constant current source driving circuit comprises the constant current source driving circuit be connected with output end of microprocessor and the negative feedback current sample circuit be 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 fender; Described voltage differential amplification sample circuit connects the microprocessor input end.
2. a kind of lithium battery protection board internal resistance measurement device according to claim 1, is characterized in that: described microprocessor employing STM32F103VET6 model single-chip microcomputer.
3. a kind of lithium battery protection board internal resistance measurement device according to claim 1, it is characterized in that: described display circuit comprises four charactrons that are connected with microprocessor.
4. a kind of lithium battery protection board internal resistance measurement device according to claim 1 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220693797 CN202956434U (en) | 2012-12-14 | 2012-12-14 | Internal resistance measuring device of lithium battery protection plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220693797 CN202956434U (en) | 2012-12-14 | 2012-12-14 | Internal resistance measuring device of lithium battery protection plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202956434U true CN202956434U (en) | 2013-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220693797 Expired - Fee Related CN202956434U (en) | 2012-12-14 | 2012-12-14 | Internal resistance measuring device of lithium battery protection plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202956434U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063925A (en) * | 2012-12-14 | 2013-04-24 | 芜湖天元汽车电子有限公司 | Measuring method and device of lithium battery protective plate internal resistance |
-
2012
- 2012-12-14 CN CN 201220693797 patent/CN202956434U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063925A (en) * | 2012-12-14 | 2013-04-24 | 芜湖天元汽车电子有限公司 | Measuring method and device of lithium battery protective plate internal resistance |
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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: 20130529 Termination date: 20151214 |
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| EXPY | Termination of patent right or utility model |