CN205015393U - High accuracy battery cell voltage monitoring devices - Google Patents
High accuracy battery cell voltage monitoring devices Download PDFInfo
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- CN205015393U CN205015393U CN201520699483.9U CN201520699483U CN205015393U CN 205015393 U CN205015393 U CN 205015393U CN 201520699483 U CN201520699483 U CN 201520699483U CN 205015393 U CN205015393 U CN 205015393U
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- monitoring device
- voltage monitoring
- battery voltage
- sampling
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Abstract
The utility model provides a high accuracy battery cell voltage monitoring devices for each battery cell's voltage among the measurement storage battery, the device is including the sampling module, signal selection module, voltage follower, AD converter and the singlechip that link to each other in order, the sampling module include with a plurality of sampling unit that each battery cell corresponds, each sampling unit's an input links to each other with storage battery's common port, another input then in proper order with the anodal of each battery cell links to each other, and wherein, first piece battery cell's negative pole is defined as storage battery's common port, each sampling unit constitutes by bleeder circuit, an analog switch is selected including parallelly connected a plurality of more to the signal selection module. The device can measure a plurality of battery cell's in the group battery terminal voltage simultaneously, reduce to measure the cost, and the simplified measurement process improves the reliability of stand -by power supply system.
Description
Technical field
The utility model relates to field of power electronics, especially, relates to the voltage monitor for storage battery unit cell.
Background technology
In industries such as communication, electric power, the normal battery pack of with low cost, stable performance that adopts is as standby power supply, and the discharged in series using method that to be battery pack conventional.Due to the existence of wooden pail effect, the overall performance of series-connected batteries depends on the cell that in electric battery, performance is the poorest, and when occurring even a backward monomer in battery pack, the performance of whole Battery pack also can decline rapidly.Effectively manage to use the energy of battery pack, need the state monitoring cell in series battery in real time.In the parameter of characterizing battery state, the terminal voltage of battery best embodies its duty, and therefore, in precise acquisition electric battery, each monomer battery voltage is very important.
In communication base station and power station, usually adopt the mode of periodic maintenance to carry out scene to standby battery group and patrol and examine, that is, to be carried out to scene, base station detecting by the regular Portable device of maintainer, maintenance work.There is very large problem in this detection mode, first, the precision of manual measurement places one's entire reliance upon the sense of responsibility of personnel and technical capability, and by the impact of the Human Physiology limit, therefore there is larger measuring error, and error is uncontrollable; Secondly, owing to being regular visit, the Real-Time Monitoring to cell state cannot be accomplished, can not the abnormality of Timeliness coverage battery, thus impact is to the accurate evaluation falling behind monomer.
For the problems referred to above, market has also occurred corresponding monomer checkout equipment, but monomer checkout equipment commercially available mostly at present is four road concurrent measurements, namely a set of equipment can only detect 4 pieces of cells.And conventional two groups of standby battery groups in communication or electric power base station, every group storage battery group has the cell of nearly 24 pieces, and a set of this commercially available checkout equipment does not reach request for utilization far away, and the way of having to take the second best is that use six is overlapped such device and measured simultaneously.Because 24 cells are cascaded structures, same measuring basis guarantee consistance need be adopted during measurement, meet accuracy requirement.And use six complete equipments to mean existence six road measuring-signal, then often increase by a road measuring-signal, interference will be brought to the measurement of other monomers, the precision that impact is measured.In addition, if measure a Battery pack to need multiple devices, certainly will bring difficulty to practical operation, because equipment is many, line is complicated, easily makes mistakes.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide a kind of batteries monomer voltage monitor, can realize multipath concurrence and detect, namely monitor the terminal voltage of the polylith cell in a battery pack, and measurement result be reliable, precision is high.
A kind of high precision monomer battery voltage monitoring device, for measuring the voltage of each cell in battery pack, it is characterized in that, described device comprises the sampling module be connected in turn, signal selection module, voltage follower, AD converter and single-chip microcomputer, described sampling module comprises several sampling units corresponding with described each cell, one input end of each sampling unit is connected with the common port of battery pack, another input end is then connected with the positive pole of described each cell successively, wherein, the negative pole of first piece of cell is defined as the common port of described battery pack, described each sampling unit is formed by bleeder circuit, described signal selection module comprises several multiselect one analog switches in parallel.Particularly, sampling unit and cell are relations one to one, and analog switch is used for selecting a road to send into AD converter in the multiple signals obtained at sampling module and carries out analog to digital conversion, and model, the quantity of analog switch can depending on cell block numbers.
Preferably, described each sampling unit is also provided with the capacitor for High frequency filter, and described capacitor is connected in parallel with the sampling resistor in corresponding bleeder circuit respectively.
Preferably, the low-pass filter be connected between voltage follower and AD converter is also comprised.
Preferably, described low-pass filter is made up of RC filtering circuit.
Preferably, another voltage follower be connected between low-pass filter and AD converter is also comprised.
Preferably, described single-chip microcomputer is built-in with AD conversion module.
Preferably, also comprise the booster amplifier be connected between low-pass filter and single-chip microcomputer, described booster amplifier and described AD converter are connected in parallel.
Preferably, the input end of described booster amplifier is connected with RC filtering circuit.
Preferably, the output terminal of described single-chip microcomputer is connected with wireless transmitter module, and each monomer voltage data recorded, by being arranged on wireless receiving module on slave computer and slave computer carries out radio communication, are transferred to slave computer by described wireless transmitter module.
Preferably, described slave computer is communicated with long-range host computer by Ethernet or GPRS, sends data to host computer.
Scheme compared to existing technology, the beneficial effects of the utility model are, adopt monitoring device of the present utility model, use one table apparatus can be realized just can measure the monomer battery voltage of arbitrary number simultaneously, thus simplified measurement process, reduce and measure cost, improve the reliability of standby power system, and measuring accuracy is high.
Accompanying drawing explanation
Following detailed description in conjunction with the drawings, above-mentioned and other object of the present disclosure, feature and advantage will become more apparent.In the accompanying drawings:
Fig. 1 is the structured flowchart of the utility model monomer battery voltage monitoring device;
Fig. 2 is the electrical schematic diagram of a kind of embodiment of the utility model monomer battery voltage monitoring device.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 is the system architecture diagram of the utility model monomer battery voltage monitoring device, this monitoring device comprises the sampling module, signal selection module, voltage follower, AD converter and the single-chip microcomputer that are connected in turn, for measuring the voltage of cell 1 ~ cell n in electric battery, wherein sampling module by with cell one to one n sampling unit form.Signal selection module is used for selecting a road to send into AD converter in the n road signal obtained at sampling module and carries out analog to digital conversion, and simulating signal is sent into single-chip microcomputer and carried out the process such as follow-up storage, display, transmission after AD converter is transformed into digital signal.Wherein, simulating signal needed through voltage follower before entering AD converter.The feature of voltage follower is that input impedance is high, and output impedance is low, has the effect of buffering, isolation, in the utility model, its role is to make to be independent of each other between the signal selection module of prime and the AD converter of rear class.
Here in communication base station, be applied as example with monomer battery voltage monitoring device, a kind of embodiment of the present utility model is described in detail.The standby power supply used in communication base station is two group storage battery groups normally, and each group is connected in groups by 24 pieces of cells (2V), provides the voltage of 48V.As shown in Figure 2, B1 ~ B24 is 24 pieces of cells of connecting in a group storage battery group, and the corresponding sampling unit of each monomer, sampling module 1 comprises corresponding 24 sampling units.Described sampling unit is bleeder circuit, and such as, the sampling unit of B1 is the bleeder circuit be made up of sampling resistor 1R1 and divider resistance 2R1, and the rest may be inferred.An input end of sampling unit is connected with the common port of battery pack, and another input end is then connected with the positive pole of cell successively, and wherein, the negative pole of first piece of cell B1 is defined as the common port of described battery pack.In fact, the terminal voltage signal V01 of what first sampling unit obtained is first piece of cell B1, and second sampling unit obtains is monomers B 1 and the terminal voltage sum V02 of monomers B 2, the like, what i-th sampling unit obtained is the terminal voltage sum of monomers B 1 to Bi, and the 24th sampling unit obtain is the terminal voltage V24 of whole electric battery.Therefore, the terminal voltage of i-th piece of cell Bi can be calculated by subtraction.Must be noted that because measurement range there occurs incremental variations, the divider resistance of each sampling unit needs to adjust.In addition, other equipment a lot of are installed in base station, thus there is multiple undesired signal, this certainly will have influence on the precision of measurement, therefore, each sampling unit is also provided with the capacitor 1C1 ~ 1C24 for High frequency filter be connected in parallel with sampling resistor 1R1 ~ 1R24 respectively, to remove the interference of outer signals.
Voltage signal V01 ~ the V24 gathered by sampling unit 1 is admitted to signal selection module 2, to select a road signal carrying out subsequent treatment.Consider consistance and the reliability of measurement, the signal selection module 2 of the present embodiment adopts the combinational circuit of three pieces " 8 select 1 electronic analog swtich ", and particularly, described electronic analog swtich U1 can select model C D4051.Wherein, each analog switch U1 can realize 8 way switch and control, and three analog switches can complete 24 road signal inputs, and realize the acquisition process of data through AD converter, under the control of follow-up main control chip, can complete concomitantly and the circulation of 24 road monomer terminal voltages is measured.
As diagram, the signal selected by signal selection module 2 is not directly carry out analog to digital conversion, but successively being just input to AD converter U5 through voltage follower U2, RC wave filter 3 and voltage follower U3 converts digital signal to, then send in single-chip microcomputer U6 and process.In the present embodiment, AD converter U5 selects the ADS1110 with 16 precision, and single-chip microcomputer U6 selects the STC15F2kxx single-chip microcomputer with built-in AD conversion module.Voltage follower U2 is equivalent to the buffer circuit of high impedance input, and because impedance is high, be similar to open-circuit condition to front stage circuits, thus the resistance of analog switch can not carry out dividing potential drop to sampling resistor, ensure that the accuracy of sampled signal.When signal selection module 2 works, analog switch needs constantly to switch, the noise filtering that switching over can cause by RC wave filter 3.Voltage follower U3 is also provided with, for being isolated by the RC filtering circuit of the A/D convertor circuit of rear class and prime, to eliminate in wave filter resistance and electric capacity to the impact of sampled signal in circuit.The high precision that the setting of these structures is measurement result above provides guarantee.
Present embodiment also contemplates Redundancy Design, namely single-chip microcomputer is utilized to carry this characteristic of AD conversion module, booster amplifier 4 is set between RC wave filter 3 and single-chip microcomputer U6, for single-chip microcomputer provides the measuring-signal (MCU_in) of backup, thus still can carry out input when AD converter breaks down, improve the reliability of monitoring device.Wherein, booster amplifier 4 comprises operational amplifier U4 and resistance 3R2,3R3, and on resistance 3R2 shunt-wound capacitance 3C2, thus be formed in the RC filtering circuit of described booster amplifier 4 input end, with filtering interference signals, ensure the precision measured.On the other hand, when single-chip microcomputer does not receive the SDA input signal from ADS1110, and when there is MCU_in signal simultaneously, can judge that AD converter breaks down and alarm.
According to another embodiment of the present utility model, the output terminal of described single-chip microcomputer U6 is also connected with wireless transmitter module, this wireless transmitter module is by being arranged on wireless receiving module on slave computer and slave computer carries out radio communication, by each monomer voltage real-time data transmission of recording to slave computer, slave computer is communicated with long-range host computer by Ethernet or GPRS, the data recorded are transferred to host computer, thus realizes the remote online monitoring of batteries monomer voltage.
Adopt the technical solution of the utility model, can not only provide that precision is high, the monomer battery voltage on-line monitoring of good reliability, and for the different electric battery of number of monomers, testing goal can be reached by the quantity increasing or reduce analog switch simply, and other circuit module that need not change in monitoring device, whole device circuit is simple, and structure is highly susceptible to expansion.
It should be noted that, accompanying drawing only illustrates in each chip the part pin contributing to understanding the technical program, and all the other pins and connection thereof should be conventionally known to one of skill in the art.
Be appreciated that, the utility model is not limited to above-mentioned specific embodiment, when not deviating from disclosure spirit and essence, those skilled in the art can make various corresponding amendment and distortion according to the disclosure, and is all intended to be comprised in the scope of claims restriction to the amendment of open embodiment, the combination disclosing the feature of embodiment and other embodiment.
Claims (10)
1. a high precision monomer battery voltage monitoring device, for measuring the voltage of each cell in battery pack, it is characterized in that, described device comprises the sampling module be connected in turn, signal selection module, voltage follower, AD converter and single-chip microcomputer, described sampling module comprises several sampling units corresponding with described each cell, one input end of each sampling unit is connected with the common port of battery pack, another input end is then connected with the positive pole of described each cell successively, wherein, the negative pole of first piece of cell is defined as the common port of described battery pack, described each sampling unit is formed by bleeder circuit, described signal selection module comprises several multiselect one analog switches in parallel.
2. monomer battery voltage monitoring device according to claim 1, is characterized in that, described each sampling unit is also provided with the capacitor for High frequency filter, and described capacitor is connected in parallel with the sampling resistor in corresponding bleeder circuit respectively.
3. monomer battery voltage monitoring device according to claim 1, is characterized in that, also comprises the low-pass filter be connected between voltage follower and AD converter.
4. monomer battery voltage monitoring device according to claim 3, is characterized in that, described low-pass filter is made up of RC filtering circuit.
5. monomer battery voltage monitoring device according to claim 3, is characterized in that, also comprises another voltage follower be connected between low-pass filter and AD converter.
6. monomer battery voltage monitoring device according to claim 3, is characterized in that, described single-chip microcomputer is built-in with AD conversion module.
7. monomer battery voltage monitoring device according to claim 6, is characterized in that, also comprises the booster amplifier be connected between low-pass filter and single-chip microcomputer, and described booster amplifier and described AD converter are connected in parallel.
8. monomer battery voltage monitoring device according to claim 7, is characterized in that, the input end of described booster amplifier is connected with RC filtering circuit.
9. the monomer battery voltage monitoring device according to claim 1,2,3,4,5,6,7 or 8, it is characterized in that, the output terminal of described single-chip microcomputer is connected with wireless transmitter module, the each monomer voltage data recorded, by being arranged on wireless receiving module on slave computer and slave computer carries out radio communication, are transferred to slave computer by described wireless transmitter module.
10. monomer battery voltage monitoring device according to claim 9, is characterized in that, described slave computer is communicated with long-range host computer by Ethernet or GPRS, sends data to host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520699483.9U CN205015393U (en) | 2015-09-10 | 2015-09-10 | High accuracy battery cell voltage monitoring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520699483.9U CN205015393U (en) | 2015-09-10 | 2015-09-10 | High accuracy battery cell voltage monitoring devices |
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| CN205015393U true CN205015393U (en) | 2016-02-03 |
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| CN201520699483.9U Expired - Fee Related CN205015393U (en) | 2015-09-10 | 2015-09-10 | High accuracy battery cell voltage monitoring devices |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646798A (en) * | 2022-05-24 | 2022-06-21 | 青岛鼎信通讯股份有限公司 | Current sampling circuit and method applied to medium-voltage carrier |
-
2015
- 2015-09-10 CN CN201520699483.9U patent/CN205015393U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646798A (en) * | 2022-05-24 | 2022-06-21 | 青岛鼎信通讯股份有限公司 | Current sampling circuit and method applied to medium-voltage carrier |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160203 Termination date: 20170910 |