CN2864701Y - Modular for measuring thermistor in lithium-ion battery group protection circuit by using difference method - Google Patents
Modular for measuring thermistor in lithium-ion battery group protection circuit by using difference method Download PDFInfo
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- CN2864701Y CN2864701Y CNU2005201308302U CN200520130830U CN2864701Y CN 2864701 Y CN2864701 Y CN 2864701Y CN U2005201308302 U CNU2005201308302 U CN U2005201308302U CN 200520130830 U CN200520130830 U CN 200520130830U CN 2864701 Y CN2864701 Y CN 2864701Y
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- resistance
- thermistor
- measuring
- chip microcomputer
- operational amplifier
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
A module for using differential method to measure the thermal-sensitive resistance of the protective circuit of lithium battery is characterized in that the single-chip generates logic signal, through analogue switch, from high to low, to approach relative standard resistance, the thermal-sensitive-resistance and the standard resistance form the reverse-phase amplifier, the voltage signal is amplified and sent to the voltage processor, through a reverse-phase amplifier, the voltage signal is converted into positive voltage Vo to be sent to the single chip, while Vo=6*(Rt/Ra), Rt is the value of thermal-sensitive resistance, Ra is the value of standard resistance selected by single chip, Vo is the value of thermal-sensitive resistance calculated out by read into analogue-digit converter to be converted. The utility model has the advantages of quickly measurement on the value of thermal-sensitive resistance of the protective circuit of lithium battery.
Description
(1) technical field
The utility model relates to a kind of module of measuring thermistor in the lithium ion battery pack protection circuit, particularly relates to a kind of module of measuring thermistor in the lithium ion battery pack protection circuit with method of difference.
(2) background technology
The lithium ion battery group all is equipped with holding circuit, and its effect is to prevent in use, contingently overcharges, over-discharge can, electric current be too high, too high or too low for temperature.When above undesired situation took place, holding circuit should play a protective role; When returning to normal condition, electric battery should be able to be recovered operate as normal.
In order to satisfy above-mentioned requirement, in lithium ion battery pack protection circuit, generally all thermistor can be housed.The thermistor characteristic is: when surpassing certain temperature, its resistance value is along with the rising of temperature almost is to be increasing or lowering of phase step type.The variation of thermistor temp can cause by the electric current by thermistor, also can import heat or the stack of these two causes by the external world.Utilize the temperature characterisitic of thermistor, just can carry out overcurrent and temperature protection electric battery.Therefore, measure accurately that the thermistor resistance just seems very crucial in the lithium ion battery pack protection circuit
At present, the measuring method of thermistor resistance mainly is to adopt the measuring method of conventional, electric-resistance resistance, i.e. method of substitution, voltammetry, rule of three or directly measure with multimeter.
There is the shortcoming that precision is low, error is big in said method, because said method is in test process, thermistor all needs the long period to pass through electric current, and when thermistor can generate heat during by electric current, its resistance will change; If reduce electric current by thermistor, though can reduce thermal value, but bring difficulty can for collection voltage.
(3) summary of the invention
The purpose of this utility model just provides a kind of module with thermistor in the method for difference measurement lithium ion battery pack protection circuit, and its advantage is to measure the thermistor resistance fast, and measurement result accurately and reliably.
The technical solution of the utility model:
The utility model is to adopt method of difference to measure the module of thermistor in the lithium ion battery pack protection circuit.So-called method of difference promptly adopts the method for approaching step by step, utilizes single-chip microcomputer to select different measuring resistance and thermistor dividing potential drop, utilizes thermistor voltage after partial value to calculate thermistor.
A kind of module of measuring thermistor in the lithium ion battery pack protection circuit with method of difference, it is characterized in that selecting and the dividing potential drop part by measuring resistance, voltage processing section two parts constitute, wherein measuring resistance selection and dividing potential drop partly are by single-chip microcomputer, latch impact damper, diode, triode, measuring resistance, analog switch, operational amplifier and peripheral circuit formation also are provided with thermistor access port to be measured, when thermistor inserts, produce control signal by single-chip microcomputer, select corresponding standard resistance, thermistor is formed an anti-phase proportional amplifier with it by analog switch; The voltage processing section is to constitute another anti-phase proportional amplifier by diode, resistance and operational amplifier, and the output terminal of operational amplifier links to each other with the analog to digital converter of single-chip microcomputer, and the output voltage of operational amplifier is made as Vo; The system of selection of measuring resistance resistance is descending, approaches step by step, till Vo is in the 2-4V scope; The computing formula of Vo is: Vo=6* (Rt/Ra), and wherein Rt is the thermistor resistance, and Ra is the measuring resistance resistance that single-chip microcomputer is selected, and Vo is read in the analog to digital converter by single-chip microcomputer and changes, thereby calculates the resistance of thermistor.
Advantage of the present utility model is to measure thermistor resistance in the lithium ion battery pack protection circuit fast, and measurement result accurately and reliably.
(4) description of drawings
Accompanying drawing is circuit diagram of the present utility model and specification digest accompanying drawing.
(5) embodiment
See accompanying drawing:
The logical signal that single-chip microcomputer U1 produces, the delivery outlet P2.0-P2.2 of process single-chip microcomputer through after latching buffer buffers, connects A, B, the C pin of analog switch U2 to latching impact damper U3, U4, U5 respectively; The 1st of analog switch U2,2,4,5,12, link to each other with the E end of triode Q1 behind 13,14, the 15 pins process measuring resistance R1-R8, link to each other with the 12V power supply behind the collector C end process diode D2 of triode Q1, resistance R 10 1 ends are connected with the C end of triode Q1, and the other end links to each other with diode D2, ground connection after the B end of triode Q1 links to each other with diode D2, resistance R 9 two ends link to each other with ground with the E end of triode Q1 respectively, resistance R 11, R12, R13 respectively with latch impact damper U3, U4, U5 and 12V power supply and link to each other; The 3rd pin of analog switch U2 links to each other with the 2nd pin of operational amplifier U6, the 8th pin of analog switch U2 links to each other with positive input terminal the 3rd pin of operational amplifier U6 through resistance R 14, ground connection after the 7th pin of analog switch U2 links to each other with the 8th pin, the 6th pin ground connection of analog switch U2; Thermistor access port J_RAB to be measured links to each other with the 3rd pin of analog switch U2 and the 6th pin of operational amplifier U6; The 6th pin of operational amplifier U6 is through receiving the 2nd pin of operational amplifier U7 after the resistance R 15, resistance R 16 is connected across 2,6 pins of operational amplifier U7, resistance R 17 cross-over connections are in operational amplifier U7 the 3rd pin and ground, diode D3 cross-over connection is in ground and operational amplifier U7 the 6th pin, the 4th, 7 pins of operational amplifier U7 connect respectively-12V and+12V; The 5th pin of operational amplifier U8 links to each other with the 6th pin of operational amplifier U7, the 6th pin of operational amplifier U8 links to each other with the 7th pin, the 7th pin of operational amplifier U8 links to each other with the first passage A/D1 mouth of the analog to digital converter of single-chip microcomputer U1, and the output voltage of operational amplifier U8 is made as Vo.
Because thermistor and measuring resistance have constituted anti-phase proportional amplifier, its output voltage is a negative value, this signal process is by resistance R 15, behind the inverting amplifier that R16 and operational amplifier U7 constitute, promptly become positive voltage, operational amplifier U8 is used for eliminating interference by feeding back the formation emitter follower, behind the voltage signal process operational amplifier U8 that operational amplifier U7 produces, is changed by the analog to digital converter that single-chip microcomputer is read into.
Single-chip microcomputer U1 is by delivery outlet P2.0, and P2.1, P2.2 select corresponding standard resistance R 1-R8, and the resistance of measuring resistance R1-R8 is respectively: 10M Ω, 1M Ω, 256K Ω, 64K Ω, 32K Ω, 16K Ω, 4K Ω, 1K Ω; The system of selection of measuring resistance resistance is descending, approaches step by step, till operational amplifier U8 output voltage V o is in the 2-4V scope.The concrete practice is: as delivery outlet P2.0, the P2.1 of single-chip microcomputer, when the P2.2 level signal is 001, begin to select 10M Ω, if the resistance of thermistor is less, the numerical value of Vo is also less so, and single-chip microcomputer will be given up current numerical value; P2.0, P2.1, P2.2 level signal are 010 then, and measuring resistance is selected 1M Ω, if the numerical value of Vo is also smaller, select littler measuring resistance so again, till Vo is in the 2-4V scope; The computing formula of Vo is: Vo=6* (Rt/Ra), and wherein Rt is the thermistor resistance, and Ra is the measuring resistance resistance that single-chip microcomputer is selected, and Vo is read in the analog to digital converter by single-chip microcomputer and changes, thereby calculates the resistance of thermistor.For fear of the thermistor heating, the turn-on time of each choice criteria resistance must not be greater than 5 milliseconds, so that make the temperature of thermistor can keep normal condition.
Comparison of test results: in the time of 25 ℃, look into the thermistor specification table, checking in its measuring resistance resistance is 10.5K Ω.Now adopt different measuring methods to compare: adopting method of substitution to record resistance is 12.4K Ω; Adopting voltammetry to record resistance is 14.6K Ω; Adopting rule of three to record resistance is 8.4K Ω; Adopt multimeter directly to measure, recording resistance is 13.2K Ω; And the resistance that adopts the utility model to record is 11.1K Ω, the value of being near the mark most, and the time spent only is 3-5 second, and other method 7-10 second soon.
Claims (2)
1. module of measuring thermistor in the lithium ion battery pack protection circuit with method of difference, it is characterized in that selecting and the dividing potential drop part by measuring resistance, voltage processing section two parts constitute, wherein measuring resistance selection and dividing potential drop partly are by single-chip microcomputer, latch impact damper, diode, triode, measuring resistance, analog switch, operational amplifier and peripheral circuit formation also are provided with thermistor access port to be measured, when thermistor inserts, produce control signal by single-chip microcomputer, select corresponding standard resistance, thermistor is formed an anti-phase proportional amplifier with it by analog switch; The voltage processing section is to constitute another anti-phase proportional amplifier by diode, resistance and operational amplifier, and the output terminal of operational amplifier links to each other with the digital to analog converter of single-chip microcomputer, and the output voltage of operational amplifier is made as Vo; The system of selection of measuring resistance resistance is descending, approaches step by step, till Vo is in the 2-4V scope; The computing formula of Vo is: Vo=6* (Rt/Ra), and wherein Rt is the thermistor resistance, and Ra is the measuring resistance resistance that single-chip microcomputer is selected, and Vo is read in the analog to digital converter by single-chip microcomputer and changes, thereby calculates the resistance of thermistor.
2. the module with thermistor in the method for difference measurement lithium ion battery pack protection circuit according to claim 1 is characterized in that the resistance of measuring resistance is respectively: 10M Ω, 1M Ω, 256K Ω, 64K Ω, 32K Ω, 16K Ω, 4K Ω, 1K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201308302U CN2864701Y (en) | 2005-12-27 | 2005-12-27 | Modular for measuring thermistor in lithium-ion battery group protection circuit by using difference method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201308302U CN2864701Y (en) | 2005-12-27 | 2005-12-27 | Modular for measuring thermistor in lithium-ion battery group protection circuit by using difference method |
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| Publication Number | Publication Date |
|---|---|
| CN2864701Y true CN2864701Y (en) | 2007-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005201308302U Expired - Lifetime CN2864701Y (en) | 2005-12-27 | 2005-12-27 | Modular for measuring thermistor in lithium-ion battery group protection circuit by using difference method |
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| CN (1) | CN2864701Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456125A (en) * | 2019-08-23 | 2019-11-15 | 深圳成智达科技有限公司 | A kind of intelligent digital measuring system |
| CN110488889A (en) * | 2019-07-11 | 2019-11-22 | 湖南明康中锦医疗科技发展有限公司 | A kind of Breathing Suppotion device temperature collection control method and system |
| CN114544049A (en) * | 2022-01-05 | 2022-05-27 | 新余学院 | Pressure detection device of flexible electronic skin sensor |
-
2005
- 2005-12-27 CN CNU2005201308302U patent/CN2864701Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110488889A (en) * | 2019-07-11 | 2019-11-22 | 湖南明康中锦医疗科技发展有限公司 | A kind of Breathing Suppotion device temperature collection control method and system |
| CN110456125A (en) * | 2019-08-23 | 2019-11-15 | 深圳成智达科技有限公司 | A kind of intelligent digital measuring system |
| CN110456125B (en) * | 2019-08-23 | 2020-05-19 | 深圳成智达科技有限公司 | Intelligent digital measuring system |
| CN114544049A (en) * | 2022-01-05 | 2022-05-27 | 新余学院 | Pressure detection device of flexible electronic skin sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070131 |
|
| EXPY | Termination of patent right or utility model | ||
| DD01 | Delivery of document by public notice |
Addressee: Wang Lige Document name: Notification of Expiration of Patent Right Duration |