CN105676140A - Precise load current generator of lithium battery - Google Patents
Precise load current generator of lithium battery Download PDFInfo
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- CN105676140A CN105676140A CN201610052043.3A CN201610052043A CN105676140A CN 105676140 A CN105676140 A CN 105676140A CN 201610052043 A CN201610052043 A CN 201610052043A CN 105676140 A CN105676140 A CN 105676140A
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- load current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a precise load current generator of a lithium battery. The generator comprises a lithium battery unit of current-constant charging and discharging, a data collection unit, a control execution unit, a microprocessor control unit and a PC data collection and analysis unit, wherein the lithium battery unit is connected with the data collection unit, the data collection unit is connected with the microprocessor control unit, the microprocessor control unit is connected with the lithium battery unit and the data collection unit via the control execution unit, and the microprocessor control unit is connected with the PC data collection and analysis unit via a communication interface. The controlled load current collection unit uses a single-chip microcomputer to convert a given current signal into a given voltage signals and further to realize controllable adjustment of the load current, the load current is collected by collecting the resistance voltage drop of a diverter, and the load current can be collected highly precisely via a load resistor. The discharging and charging current of the lithium battery can be tested precisely and controlled in a programmable manner.
Description
Technical field
The present invention relates to one and relate to technical field of lithium battery detection, be specifically related to a kind of lithium battery precision load current feedback circuit.
Background technology
Along with the raising that energy storage equipment is required by commercial production and human lives, battery technology has had the development advanced by leaps and bounds in recent years, various types of accumulator have been commonly utilized in the productive life reality that people are daily, and people are also more and more higher to the performance requirement of accumulator. Development at present is more ripe and uses more accumulator to be mainly lead-acid battery, Ni-MH battery and lithium ion battery, in numerous battery varieties, the advantages such as lithium ion battery is lightweight with it, volume is little, life-span length, voltage are high and pollution-free progressively replace the batteries such as ni-mh, become the ideal source of a new generation. Lithium battery is had by productive life application: high-energy-density, high-specific-power; Charging interval is short, continuous discharge rate high, and self-discharge rate is low; Safe and reliable; The basic demands such as life-span length, cost are low.
Increase along with application scenario, practice process finds, lithium battery output characteristics is affected bigger by factors such as ambient temperature, discharge and recharge conditions, especially after lithium battery connection in series-parallel in groups, discordance difference between monomer causes whole Battery pack hydraulic performance decline in cycle-index, output etc., performance indications not only can not maintain an equal level with cell, be also greatly shortened even with the life-span, had a strong impact on the development and application of lithium battery. To the problems referred to above, it is necessary to lithium battery group carries out exfactory inspection, and regularly its performance is detected, cell is carried out strict process of separation, by good for concordance monomer combo, this is the key link assembling high performance battery. Therefore, battery testing is had higher requirement, and in battery testing single lithium battery carry out charging and discharging currents test the detection of battery performance is particularly important, but how realizing controlled high precision load electric current and become the key issue of charging and discharging lithium battery current detecting, in charge and discharge process, the measuring accuracy of load current is most important for the performance evaluation of lithium battery.
The accurately detection of electric current being directed not only to the analysis of performance, also can prevent that battery charge is excessive, current fluctuation frequent in time, and the situations such as short circuit occur, therefore, in charge and discharge process, the accurately test of electric current is significant.
Summary of the invention
The present invention is directed to the precision measurement how realizing load current and propose the generator of a kind of precision load electric current for producing needed for lithium battery parameter testing.
The present invention adopts the following technical scheme that
A kind of lithium battery precision load current feedback circuit, including the lithium cells of constant current charge-discharge, data acquisition unit, control performance element, microprocessor control unit and PC data collection and analysis unit, lithium cells connects data acquisition unit, data acquisition unit connects microprocessor control unit, microprocessor control unit connects lithium cells and data acquisition unit by controlling performance element, and microprocessor control unit connects PC data collection and analysis unit also by communication interface;
Described lithium cells includes lithium battery and current sampling resistor, just can calculate tested size of current and then the performance of reactive lithium battery by measuring the pressure drop on current sampling resistor; Described sample resistance can also change makes Hall current sensor;
Described data acquisition unit includes controlled load current acquisition unit, current feedback comparing unit, voltage detection unit, voltage detection unit monitors the voltage of lithium cells in real time, controlled load current acquisition unit by realizing the collection of load current to the collection of accurate sample resistance pressure drop, and it is made up of adder operation circuit operational amplifier and realizes the processing and amplifying of small voltage value, current feedback comparing unit, voltage signal after being amplified by load current collecting unit gives feedback circuit, compare with given current signal, comparative result is used for controlling lithium cells and realizes the controlled adjustable of load current,
Described control performance element includes that load current is given arranges unit, actuator, power amplification unit, for performing the control command of microprocessor control unit;
Described microprocessor control unit includes single-chip microcomputer, and monolithic is responsible for receiving the given value of current instruction of host computer, charge and discharge control instruction, and the data collected are uploaded to PC is analyzed, and stores;
Described PC data collection and analysis unit, realizes the communication with microprocessor control unit by communication unit, utilizes PC to carry out single-chip microcomputer and gathers the analysis of data.
Preferably, the given unit that arranges of described load current connects microprocessor control unit, the adjustment circuit that described adjustor is made up of operational amplifier, described power amplification unit includes power amplifier, power amplifier output is connected to the diode of series connection, and the diode two ends of series connection connect lithium cells through metal-oxide-semiconductor respectively.
Preferably, described metal-oxide-semiconductor includes a PMOS field effect transistor and a NMOS field effect transistor, both constitute current charge-discharge electric drive circuit, discharge and recharge signal is responded by two metal-oxide-semiconductors respectively by lithium cells when carrying out discharge and recharge, and charging and discharging currents is the random waveform of single-chip microcomputer analog-digital converter output.
Preferably, the outfan of described lithium cells connects Current amplifier feedback unit, and the input of Current amplifier feedback unit is connected to reference circuit, and the outfan of Current amplifier feedback unit connects and connects microprocessor control unit and actuator respectively.
Preferably, described reference circuit includes accurate a reference source, regulating resistor and operational amplifier, and regulating resistor makes the reference voltage that reference circuit exports controlled adjustable.
Preferably, the load current output waveform of described Current amplifier feedback unit collection is controlled by given value of current signal, and the AfD converter output of microprocessor control unit gives the load current Setting signal arranging unit output generation different wave to load current;
The load current actual waveform that controlled load current acquisition unit collects, is input to microprocessor control unit through current feedback comparing unit and compares with given load current waveform, make charging and discharging currents be infinitely close to single-chip microcomputer set-point, obtain stabling current.
The Advantageous Effects that as above technical scheme obtains is adopted to be:
Given current signal is converted into the controllable adjustment realizing load current to determining voltage signal by controlled load current acquisition unit by single-chip microcomputer, by the collection of diverter resistance drop being realized the collection of load current, and the size of load current can pass through load resistance, it is achieved high precision collecting. Achieve precision measurement and the PLC technology of charging and discharging lithium battery electric current.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of lithium battery precision load current feedback circuit of the present invention.
Fig. 2 is the hardware structure diagram controlling performance element and controlled load current acquisition element circuit.
Fig. 3 is the voltage acquisition hardware structure diagram of lithium battery precision load current feedback circuit of the present invention.
Fig. 4 is the AD signal conversion hardware structure chart of lithium battery precision load current feedback circuit of the present invention.
Fig. 5 is the communicating circuit hardware structure diagram of lithium battery precision load current feedback circuit of the present invention.
Detailed description of the invention
Lithium battery precision load current feedback circuit, can realize the accurate of the load current in charging and discharging lithium battery process and gather, and the acquisition precision of charging and discharging lithium battery electric current has a very important role for the performance test of lithium battery.
Below in conjunction with accompanying drawing 1-5, the present invention is described in further detail:
A kind of lithium battery precision load current feedback circuit, including the lithium cells of constant current charge-discharge, data acquisition unit, control performance element, microprocessor control unit and PC data collection and analysis unit, lithium cells connects data acquisition unit, data acquisition unit connects microprocessor control unit, microprocessor control unit connects lithium cells and data acquisition unit by controlling performance element, and microprocessor control unit connects PC data collection and analysis unit also by communication interface.
Lithium cells includes lithium battery and load resistance, just can calculate tested size of current and then the performance of reactive lithium battery by measuring the pressure drop on load resistance.
Data acquisition unit includes controlled load current acquisition unit, current feedback comparing unit, voltage detection unit, voltage detection unit monitors the voltage of lithium cells in real time, controlled load current acquisition unit by realizing the collection of load current to the collection of accurate sample resistance pressure drop, and it is made up of adder operation circuit operational amplifier and realizes the processing and amplifying of small voltage value, current feedback comparing unit, voltage signal after being amplified by load current collecting unit gives feedback circuit, compare with given current signal, comparative result is used for controlling lithium cells and realizes the controlled adjustable of load current.
As it is shown in figure 5, PC data collection and analysis unit, utilize the affluent resources of PC to carry out single-chip microcomputer and gather the analysis of data, realized the Accurate Analysis of lithium battery performance by upper computer software. Wherein the communication between single-chip microcomputer and host computer adopts USART-USB interface to realize, the load current signal that single-chip microcomputer will be collected by communication interface, voltage signal in charging and discharging lithium battery process is uploaded to upper PC and carries out data analysis, and the given value of current signal that upper PC can also be tested simultaneously is transferred to single-chip microcomputer and carries out the given of load current.
Microprocessor control unit, the single-chip microcomputer of employing is the STM32F103 series monolithic of TI company, flexible in programming, and the resource having is sufficient for the performance requirement of this test device, and microprocessor control unit also includes converter circuit.
As shown in Figure 4, converter of the present invention adopts ADS1274 chip, it is possible to realize multi channel signals synchronous acquisition. ADS1274 allows to select one, pattern to arrange in high speed, high-resolution, low-power consumption, 4 kinds of mode of operations of low speed and is determined by digital input pins MODE state. In the present invention, the mode selection pin MODE [1:0] of ADS1274 connects the I/O pin of single-chip microcomputer and is AD converted the selection of mode of operation by single-chip microcomputer. Data output after ADS1274 conversion adopts SPI protocol and single chip communication, and selected data output format is that TDM mode is shifted output by DOUT1 pin simultaneously, and the selection of agreement and data output format is to be determined by the input state of FORFMAT pin.
Owing to the voltage of system acquisition is very faint in AD conversion module of the present invention, in microvolt magnitude, and the intensity of noise in environment and interference is approximately zero point several millivolts, therefore needs circuit output signal is nursed one's health before A/D samples, with filtering environmental noise, improve common mode rejection ratio. Signal conditioning circuit of the present invention mainly adopts the modulate circuit before TI company OPA1632 operational amplifier composition collection voltage signal AD conversion.
Controlled load current acquisition unit, selects diverter during system design, allows the electric current needing detection flow through diverter resistance, just can calculate tested size of current by measuring ohmically pressure drop. The application of diverter load resistance is simple, convenience of calculation, and precision is suitable for. The accuracy resistance that the present invention adopts resistance to be 2.2 ohm is to carry out the generation of load current, and the collection of load current simultaneously is to be realized by the voltage drop at collection load resistance two ends.
Because the voltage signal collected is small-signal, via the integrated operational amplifier LM358 addition amplifying circuit constituted, after amplifying 10 times, at the accurate reference voltage value of the 1.5V produced plus reference voltage circuit, will add up the magnitude of voltage obtained containing load current signal and deliver to the interface of single-chip microcomputer to realize the collection of load current signal. Because of the 0～5V that ranges for of single-chip microcomputer signal, thus during signal analysis, signal value is the most accurate at 2.5V right position, and the effect of reference voltage is to be raised to signal voltage to be best suitable for position, to facilitate identification and the data acquisition of single-chip microcomputer.
Said reference voltage generation circuit, controllable accurate source of stable pressure TL431 is adopted to carry out the generation of reference voltage, the output of TL431 just can arbitrarily be arranged with two divider resistances by any magnitude of voltage within the scope of Verf (2.5V) to 36V, and present invention design has slide rheostat to realize the controlled design of reference voltage value. The setting value of certain ordinary circumstance reference voltage of the present invention is 1.5V.
Load current feedback comparing unit, the single supply integrated operational amplifier LM358 voltage signal gathered by controlled load current acquisition unit is adopted to compare with given voltage (electric current) signal, with this response speed judging tested lithium battery, analyze the behavior pattern of tested lithium battery.
Charge-discharge control unit, including two diodes, two flow control resistance, and two metal-oxide-semiconductors. Single-chip microcomputer in order to realize discharge and recharge is controlled, the present invention adopts integrated operational amplifier LM358 to devise the comparison amplifying circuit of voltage, by the difference of the load voltage signal to determining voltage signal and collection after comparing amplifying circuit and amplifying 100 times, the voltage signal after amplification is flowed to controller and carries out charge and discharge control.
Charge and discharge system adopts current constant mode, and when given magnitude of voltage is higher than collection load voltage values, comparing amplifying circuit is output as high level, and metal-oxide-semiconductor Q1 turns on, and metal-oxide-semiconductor Q2 ends, and battery carries out constant-current charge; When given magnitude of voltage is lower than collection load voltage values, differential amplifier circuit is output as low level, and metal-oxide-semiconductor Q2 turns on, and metal-oxide-semiconductor Q1 ends, and lithium battery carries out constant-current discharge.
When battery charges to high voltage, charging current can reduce, and at this moment addition amplifier two ends input voltage poor (load resistance pressure drop) reduces, and additive operation output voltage values can reduce accordingly. And the output voltage values of difference amplifier increases. When the output voltage values that partite transport of being on duty is put increases, the base current of metal-oxide-semiconductor Q1 increases, and corresponding emitter current value also increases, and charging current increases. The constant-current charge of lithium battery is achieved by feedback system.
Equally, during battery discharge, the terminal voltage of battery reduces, and discharge current increases, and at this moment addition amplifier two ends input voltage poor (load resistance pressure drop) increases, and additive operation output voltage values increases, and the output voltage values of difference amplifier reduces. The base current of metal-oxide-semiconductor Q2 reduces, and respective episode electrode current reduces, and discharge current value also can reduce. The constant-current discharge of lithium battery is achieved by feedback system.
Lithium battery voltage collecting unit, as shown in Figure 3, it is possible to gather the real-time voltage value in charging and discharging lithium battery process, and in conjunction with real-time current data, better to carry out the performance evaluation of lithium battery. Present invention design utilizes integrated operational amplifier to build linear circuit, after the magnitude of voltage of circuit collection is nursed one's health by voltage conditioned signal, processes in A/D converter of this value being made a gift to someone.
Certainly; described above it is only presently preferred embodiments of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this specification; made all equivalent replacement, obvious variant, all fall within the essential scope of this specification, ought to be subject to the protection of the present invention.
Claims (6)
1. a lithium battery precision load current feedback circuit, it is characterized in that, including the lithium cells of constant current charge-discharge, data acquisition unit, control performance element, microprocessor control unit and PC data collection and analysis unit, lithium cells connects data acquisition unit, data acquisition unit connects microprocessor control unit, microprocessor control unit connects lithium cells and data acquisition unit by controlling performance element, and microprocessor control unit connects PC data collection and analysis unit also by communication interface;
Described lithium cells includes lithium battery and current sampling resistor, just can calculate tested size of current and then the performance of reactive lithium battery by measuring the pressure drop on current sampling resistor;
Described data acquisition unit includes controlled load current acquisition unit, current feedback comparing unit, voltage detection unit, voltage detection unit monitors the voltage of lithium cells in real time, controlled load current acquisition unit by realizing the collection of load current to the collection of accurate sample resistance pressure drop, and it is made up of adder operation circuit operational amplifier and realizes the processing and amplifying of small voltage value, current feedback comparing unit, voltage signal after being amplified by load current collecting unit gives feedback circuit, compare with given current signal, comparative result is used for controlling lithium cells and realizes the controlled adjustable of load current,
Described control performance element includes that load current is given arranges unit, actuator, power amplification unit, for performing the control command of microprocessor control unit;
Described microprocessor control unit includes single-chip microcomputer, and monolithic is responsible for receiving the given value of current instruction of host computer, charge and discharge control instruction, and the data collected are uploaded to PC is analyzed, and stores;
Described PC data collection and analysis unit, realizes the communication with microprocessor control unit by communication unit, utilizes PC to carry out single-chip microcomputer and gathers the analysis of data.
2. a kind of lithium battery precision load current feedback circuit according to claim 1, it is characterized in that, the given unit that arranges of described load current connects microprocessor control unit, the adjustment circuit that described adjustor is made up of operational amplifier, described power amplification unit includes power amplifier, power amplifier output is connected to the diode of series connection, and the diode two ends of series connection connect lithium cells through metal-oxide-semiconductor respectively.
3. a kind of lithium battery precision load current feedback circuit according to claim 2, it is characterized in that, described metal-oxide-semiconductor includes a PMOS field effect transistor and a NMOS field effect transistor, both constitute current charge-discharge electric drive circuit, discharge and recharge signal is responded by two metal-oxide-semiconductors respectively by lithium cells when carrying out discharge and recharge, and charging and discharging currents is the random waveform of single-chip microcomputer analog-digital converter output.
4. a kind of lithium battery precision load current feedback circuit according to claim 2, it is characterized in that, the outfan of described lithium cells connects Current amplifier feedback unit, the input of Current amplifier feedback unit is connected to reference circuit, and the outfan of Current amplifier feedback unit connects and connects microprocessor control unit and actuator respectively.
5. a kind of lithium battery precision load current feedback circuit according to claim 4, it is characterised in that described reference circuit includes accurate a reference source, regulating resistor and operational amplifier, and regulating resistor makes the reference voltage that reference circuit exports controlled adjustable.
6. a kind of lithium battery precision load current feedback circuit according to claim 5, it is characterized in that, the load current output waveform of described Current amplifier feedback unit collection is controlled by given value of current signal, and the AfD converter output of microprocessor control unit gives the load current Setting signal arranging unit output generation different wave to load current;
The load current actual waveform that controlled load current acquisition unit collects, is input to microprocessor control unit through current feedback comparing unit and compares with given load current waveform, make charging and discharging currents be infinitely close to single-chip microcomputer set-point, obtain stabling current.
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| CN201610052043.3A CN105676140A (en) | 2016-01-26 | 2016-01-26 | Precise load current generator of lithium battery |
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| CN201610052043.3A CN105676140A (en) | 2016-01-26 | 2016-01-26 | Precise load current generator of lithium battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109030931A (en) * | 2018-08-22 | 2018-12-18 | 延安大学 | Current signal detecting device based on Arduino single-chip microcontroller |
| CN109510274A (en) * | 2018-12-11 | 2019-03-22 | 鞍钢集团工程技术有限公司 | A kind of lithium battery pre-charge circuit |
| CN109669141A (en) * | 2018-12-18 | 2019-04-23 | 成都纵横大鹏无人机科技有限公司 | A kind of discharge test method, device and equipment |
| CN109950584A (en) * | 2019-03-25 | 2019-06-28 | 武汉海亿新能源科技有限公司 | A kind of activation of fuel cell control method, device and system |
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Application publication date: 20160615 |