CN203909136U - Cell voltage acquisition circuit and battery management system with same - Google Patents
Cell voltage acquisition circuit and battery management system with same Download PDFInfo
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- CN203909136U CN203909136U CN201420264842.3U CN201420264842U CN203909136U CN 203909136 U CN203909136 U CN 203909136U CN 201420264842 U CN201420264842 U CN 201420264842U CN 203909136 U CN203909136 U CN 203909136U
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- analog switch
- acquisition circuit
- voltage acquisition
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- battery voltage
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Abstract
The utility model discloses a cell voltage acquisition circuit and a battery management system with same. The cell voltage acquisition circuit includes a first analog switch, a second analog switch, an operational amplifier, an ADC unit, and a microcontroller, the microcontroller is connected with the first analog switch and the second analog switch, and is used for selecting the turn-on loop of the first analog switch and the second analog switch and receiving digital quantities converted by the ADC unit. The cell voltage acquisition circuit selects a cell to be measured by means of the analog switches, so that the voltage acquisition circuit is flexibly set based on the quantities of cells, and the flexibility of cell voltage data acquisition is improved.
Description
Technical field
The utility model relates to automobile technical field, particularly relates to a kind of monomer battery voltage Acquisition Circuit for electric motor car or motor vehicle driven by mixed power and has its battery management system.
Background technology
In the battery management system of oil-electric vehicle, plug-in hybrid-power automobile or pure electric automobile, be widely used at present lithium ion battery as electrokinetic cell.It is large that lithium ion battery has energy density, and the advantage such as have extended cycle life.But because cell in use overcharges, crosses and put all and can cause serious damage to monomer lithium ion electronics, its volume lowering, life-span are reduced, in serious situation, also can there is explosion and catching fire, serious threat driver and conductor's safety of life and property.
Battery cell discharges and recharges unbalanced, causes overcharging, crossing the phenomenon of putting, and its main cause is the monomer conformity error of lithium ion battery.Battery management system (BMS) is the important component part of electric automobile, BMS Real-time Collection battery charging and discharging state, and image data comprises the information such as the voltage of each cell and temperature, guarantees electrokinetic cell safety and stablization at work.
At present, the general cell Acquisition Circuit of BMS is to select AFE (analog front end) (a kind of integrated chip) to complete the voltage measurement of series-connected cell module.
Fig. 1 is the schematic diagram of cell Acquisition Circuit of the prior art.Electric battery 1, AFE (analog front end) 2, isolated from power unit 3, isolating device 4, power supply management unit 5, CAN transceiver 6, microcontroller 7 and electric interfaces 8 have been shown in Fig. 1.
Microcontroller 7 sends steering order by spi bus, and SPI data are carried out communication with AFE (analog front end) 2 after buffering and isolation.AFE (analog front end) 2 is integrated circuit (IC) chip.In hardware design, spi bus is by the SPI Interface realization electrical isolation of isolating device and AFE (analog front end), and the power supply unit of power supply management unit and AFE (analog front end) is also realized electrical isolation by battery isolation circuitry.AFE (analog front end) 2 receives after steering order, carries out cell voltage collection, digital filtering and data transmission work.Microcontroller 7 is given other control modules by the monomer battery voltage data that collect by CAN bus transfer.
Because the integrated level of AFE (analog front end) is higher, for certain restriction that can detect the quantity of battery, reduced the dirigibility of battery cell acquisition system.
Therefore, wish the above-mentioned defect that a kind of monomer battery voltage Acquisition Circuit overcomes or at least alleviate prior art.
Utility model content
The technical matters that the utility model solves is for providing a kind of monomer battery voltage Acquisition Circuit to overcome or at least alleviate the above-mentioned defect of prior art.
For this reason, the utility model provides a kind of monomer battery voltage Acquisition Circuit, and described monomer battery voltage Acquisition Circuit comprises:
The first analog switch, it has a plurality of input interfaces and an output interface, and input interface is connected with the positive pole of a cell of electric battery described in each of the first analog switch;
The second analog switch, it has a plurality of input interfaces and an output interface, and input interface is connected with the negative pole of a cell of electric battery described in each of the second analog switch;
Operational amplifier, it has input end and output terminal, and described input end is connected with the output interface of the second analog switch with the output interface of described the first analog switch,
ADC unit, it is connected with microcontroller with the output terminal of operational amplifier, and the monomer battery voltage of the output terminal from operational amplifier is changed into digital output to microcontroller; And
Microcontroller, it is connected with the second analog switch with described the first analog switch, for the connection loop of selected the first analog switch and the second analog switch, and for receiving the digital quantity after ADC unit transforms.
Preferably, described the first analog switch and the second analog switch are identical analog switches, and are eight tunnels analogy switches.
Preferably, described the first analog switch and the second analog switch are identical analog switches, and be all 16 tunnels analogy switches, each 16 tunnels analogy switch comprises two eight tunnels analogy switches and two passage analog switches, described eight input interfaces of tunnels analogy switch and the negative or positive electrode of cell are connected, output interface is communicated with the input interface of described two passage analog switches, and described two output interfaces of passage analog switch and the input end of operational amplifier are connected.
Preferably, described operational amplifier is isolation operational amplifier.Further preferably, between described microcontroller and described the first analog switch, the second analog switch, be provided with buffer circuit.
Preferably, described monomer battery voltage Acquisition Circuit further comprises the HSSI High-Speed Serial Interface being connected with described microcontroller, for exporting the monomer battery voltage value recording.
Preferably, described monomer battery voltage Acquisition Circuit further comprises the optical transceiver module being connected with described HSSI High-Speed Serial Interface, for carrying out optical fiber communication.
The utility model also provides a kind of battery management system, and described battery management system comprises monomer battery voltage Acquisition Circuit as above.
Monomer battery voltage Acquisition Circuit of the present utility model adopts analog switch to select measured cell, makes voltage collection circuit to be set flexibly according to the quantity of cell, has improved the dirigibility of monomer battery voltage data acquisition.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of cell Acquisition Circuit of the prior art.
Fig. 2 is according to the schematic diagram of the cell Acquisition Circuit of the utility model one embodiment.
Reference numeral:
| 1 | Electric battery | 23 | The second analog switch |
| 2 | AFE (analog front end) | 24 | Operational amplifier |
| 3 | Isolated from power unit | 25 | Buffer circuit |
| 4 | Isolating device | 26 | ADC unit |
| 5 | Power supply management unit | 27 | Microcontroller |
| 6 | CAN transceiver | 28 | HSSI High-Speed Serial Interface |
| 7 | Microcontroller | 29 | Optical transceiver module |
| 8 | Electric interfaces | 30 | Optical interface |
| 22 | The first analog switch | ? | ? |
Embodiment
For object, technical scheme and advantage that the utility model is implemented are clearer, below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Described embodiment is the utility model part embodiment, rather than whole embodiment.Below by the embodiment being described with reference to the drawings, be exemplary, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as the restriction to the utility model protection domain.
Fig. 2 is according to the schematic diagram of the cell Acquisition Circuit of the utility model one embodiment.Fig. 2 shows electric battery 1, and electric battery 1 comprises a plurality of cells that are connected in series.Monomer battery voltage Acquisition Circuit shown in Fig. 2 comprises the first analog switch 22, the second analog switch 23, operational amplifier 24, ADC unit 26, microcontroller 27 and HSSI High-Speed Serial Interface 28 etc.It is pointed out that ADC unit 26 can be independently device or unit, also can be integrated into microcontroller 27.Similar with it, HSSI High-Speed Serial Interface 28 can be independently device or unit, also can be integrated into microcontroller 27.
The first analog switch 22 has a plurality of input interfaces and an output interface, and each input interface of the first analog switch 22 is connected with the positive pole of corresponding cell in electric battery 1.The second analog switch 23 has a plurality of input interfaces and an output interface, and each input interface of the second analog switch 23 is connected with the negative pole of corresponding cell in electric battery 1.Be understandable that, the first analog switch 22 and the second analog switch 23, outside above-mentioned input interface and output interface, also have steering order input interface, for the loop of setting or select the first analog switch 22 and the second analog switch 23 to carry out work.
The first analog switch 22 and the second analog switch 23 are comprised of metal-oxide-semiconductor.Metal-oxide-semiconductor is only applicable to be no more than its working pressure, situation that electric current is less, and therefore, the first analog switch 22 and the second analog switch 23 preferably adopt high voltage analog switch, to adapt to the high voltage of electric battery.Or can between electric battery and the first analog switch 22 and described the second analog switch 23, adopt bleeder circuit to carry out the voltage of control inputs to the first analog switch 22 and the second analog switch 23.
Operational amplifier 24 has input end and output terminal.The output interface of the first analog switch 22 and the second analog switch 23 be connected with the input end of described operational amplifier 24.In order to reduce the phase mutual interference between 24 liang of lateral circuits of operational amplifier, make electrical isolation, preferably adopt the operational amplifier 24 of built-in isolated amplifier, or between operational amplifier 24 and the first analog switch and the second analog switch, isolated amplifier is set.
The output terminal of operational amplifier 24 is connected with ADC unit 26, and the monomer battery voltage after operational amplifier 24 is processed is sampled by described ADC unit 26, and converts digital form to through ADC unit 26.The output of ADC unit 26 is connected with microcontroller 27, by changed into digital transfer to microcontroller 27.
The first analog switch 22 and the second analog switch 23 are also connected with described microcontroller 27, by the steering order in described microcontroller 27, select which cell in electric battery 1 to carry out voltage measurement.
In like manner, in order to reduce the interference between the different operating potential circuit of both sides, the steering order that microcontroller 27 is sent and analog switch steering logic are carried out electrical isolation, between microcontroller 27 and the first analog switch 22 and the second analog switch 23, also add a buffer circuit 25.Advantageously, operational amplifier 24 is isolation operational amplifiers, thereby the high-pressure side circuit of operational amplifier 24 is kept apart in the lower-voltage circuit of operational amplifier 24, avoid the voltage of the high-pressure side circuit of operational amplifier 24 in abnormal conditions, to be conducted to the lower-voltage circuit of operational amplifier 24.
The first analog switch 22 as above and the second analog switch 23 can adopt several as follows: single eight tunnels analogy switches, two eight tunnels analogy switches, 16 single channel analog switches, 16 binary channels analog switches, Dan Sanshi bis-passage analog switches, two 32 passage analog switches or chess matrix analogue switch, described 32 passages can be by 16 two passage cascades, eight four-way cascades, which kind of tunnels analogy switch four eight passage cascades or two 16 passage cascades, specifically adopt to determine according to cell quantity in electric battery 1.
16 tunnels analogy switches as above can be to comprise two eight tunnels analogy switches and two passage analog switches, described eight input interfaces of tunnels analogy switch and the negative or positive electrode of cell are connected, output interface is communicated with the input interface of described two passage analog switches, and the output interface of described two passage analog switches is connected with the input end of operational amplifier 24.
Described microprocessor 27 is connected with optical transceiver module 29 by HSSI High-Speed Serial Interface 28, for carrying out optical fiber communication.Optical transceiver module 29 is for passing through optical interface 30 and other devices communicatings.
Please refer to Fig. 2, Fig. 2 is according to the schematic diagram of the cell Acquisition Circuit of the utility model one embodiment.The I/O end of described microcontroller 27 is connected with the control input end of the first analog switch 22 and the second analog switch 23 by buffer circuit 25, and send steering order, to control the voltage of cell in the first analog switch 22 and 23 pairs of electric battery 1 of the second analog switch, choose.The voltage of the cell after described the first analog switch 22 and the second analog switch 23 are chosen passes to described isolation operational amplifier 24 by 23 output terminals of the first analog switch 22 and the second analog switch, signal after isolation operational amplifier 24 amplifies passes to 26 samplings of ADC unit, and by ADC unit 26, convert digital quantity to, described ADC unit 26 by the digital transfer converting to microcontroller 27.Described microprocessor 27 is connected with optical transceiver module 29 by HSSI High-Speed Serial Interface 28, for carrying out optical fiber communication, by gained digital transfer to other equipment, as the display etc. of digital quantity as described in showing.
The utility model also provides a kind of battery management system, comprises monomer battery voltage Acquisition Circuit as above.
It is to be noted: above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit.Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (8)
1. a monomer battery voltage Acquisition Circuit, is characterized in that, comprising:
The first analog switch, it has a plurality of input interfaces and an output interface, and input interface is connected with the positive pole of a cell of electric battery described in each of the first analog switch;
The second analog switch, it has a plurality of input interfaces and an output interface, and input interface is connected with the negative pole of a cell of electric battery described in each of the second analog switch;
Operational amplifier, it has input end and output terminal, and described input end is connected with the output interface of the second analog switch with the output interface of described the first analog switch,
ADC unit, it is connected with microcontroller with the output terminal of operational amplifier, and the monomer battery voltage of the output terminal from operational amplifier is changed into digital output to microcontroller; And
Microcontroller, it is connected with the second analog switch with described the first analog switch, for the connection loop of selected the first analog switch and the second analog switch, and for receiving the digital quantity after ADC unit transforms.
2. monomer battery voltage Acquisition Circuit as claimed in claim 1, is characterized in that, described the first analog switch and the second analog switch are identical analog switches, and is eight tunnels analogy switches.
3. monomer battery voltage Acquisition Circuit as claimed in claim 1, it is characterized in that, described the first analog switch and the second analog switch are identical analog switches, and be all 16 tunnels analogy switches, each 16 tunnels analogy switch comprises two eight tunnels analogy switches and two passage analog switches, described eight input interfaces of tunnels analogy switch and the negative or positive electrode of cell are connected, output interface is communicated with the input interface of described two passage analog switches, and described two output interfaces of passage analog switch and the input end of operational amplifier are connected.
4. monomer battery voltage Acquisition Circuit as claimed in claim 1, is characterized in that, described operational amplifier is isolation operational amplifier.
5. monomer battery voltage Acquisition Circuit as claimed in claim 4, is characterized in that, between described microcontroller and described the first analog switch, the second analog switch, is provided with buffer circuit.
6. monomer battery voltage Acquisition Circuit as claimed in claim 1, is characterized in that, further comprises the HSSI High-Speed Serial Interface being connected with described microcontroller, for exporting the monomer battery voltage value recording.
7. monomer battery voltage Acquisition Circuit as claimed in claim 6, is characterized in that, further comprises the optical transceiver module being connected with described HSSI High-Speed Serial Interface, for carrying out optical fiber communication.
8. a battery management system, is characterized in that, comprises the monomer battery voltage Acquisition Circuit as described in any one in claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420264842.3U CN203909136U (en) | 2014-05-22 | 2014-05-22 | Cell voltage acquisition circuit and battery management system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420264842.3U CN203909136U (en) | 2014-05-22 | 2014-05-22 | Cell voltage acquisition circuit and battery management system with same |
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| Publication Number | Publication Date |
|---|---|
| CN203909136U true CN203909136U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420264842.3U Expired - Fee Related CN203909136U (en) | 2014-05-22 | 2014-05-22 | Cell voltage acquisition circuit and battery management system with same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459554A (en) * | 2014-12-02 | 2015-03-25 | 河南新太行电源有限公司 | Battery cell monitoring device for high-capacity storage battery formation |
| CN104931894A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | System for sampling lithium ion battery state parameters |
| CN107727923A (en) * | 2017-08-29 | 2018-02-23 | 宁德时代新能源科技股份有限公司 | High-voltage sampling circuit and battery management system |
| WO2018076807A1 (en) * | 2016-10-28 | 2018-05-03 | 宁德时代新能源科技股份有限公司 | Method and device for spark detection and detection system |
| CN108957336A (en) * | 2018-06-08 | 2018-12-07 | 东莞市德尔能新能源股份有限公司 | A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) |
| CN109061510A (en) * | 2018-09-18 | 2018-12-21 | 深圳市快车道新能源发展有限公司 | A kind of floated Stringing cells group voltage collection circuit |
| CN109975604A (en) * | 2019-04-01 | 2019-07-05 | 炫途储能科技(上海)有限公司 | A kind of low cost lithium battery voltage detection device and its method |
| CN110609242A (en) * | 2019-10-31 | 2019-12-24 | 安徽江淮汽车集团股份有限公司 | Monomer voltage acquisition circuit, method and device |
| CN112467177A (en) * | 2019-09-06 | 2021-03-09 | 杭州中科氢能科技有限公司 | Voltage acquisition monitoring device and method for all-vanadium redox flow battery |
| CN113189395A (en) * | 2020-12-28 | 2021-07-30 | 武汉信测标准技术服务有限公司 | Multiplexing voltage drop test circuit |
-
2014
- 2014-05-22 CN CN201420264842.3U patent/CN203909136U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459554A (en) * | 2014-12-02 | 2015-03-25 | 河南新太行电源有限公司 | Battery cell monitoring device for high-capacity storage battery formation |
| CN104931894A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | System for sampling lithium ion battery state parameters |
| WO2018076807A1 (en) * | 2016-10-28 | 2018-05-03 | 宁德时代新能源科技股份有限公司 | Method and device for spark detection and detection system |
| CN107727923A (en) * | 2017-08-29 | 2018-02-23 | 宁德时代新能源科技股份有限公司 | High-voltage sampling circuit and battery management system |
| CN108957336A (en) * | 2018-06-08 | 2018-12-07 | 东莞市德尔能新能源股份有限公司 | A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) |
| CN109061510A (en) * | 2018-09-18 | 2018-12-21 | 深圳市快车道新能源发展有限公司 | A kind of floated Stringing cells group voltage collection circuit |
| CN109975604A (en) * | 2019-04-01 | 2019-07-05 | 炫途储能科技(上海)有限公司 | A kind of low cost lithium battery voltage detection device and its method |
| CN112467177A (en) * | 2019-09-06 | 2021-03-09 | 杭州中科氢能科技有限公司 | Voltage acquisition monitoring device and method for all-vanadium redox flow battery |
| CN110609242A (en) * | 2019-10-31 | 2019-12-24 | 安徽江淮汽车集团股份有限公司 | Monomer voltage acquisition circuit, method and device |
| CN113189395A (en) * | 2020-12-28 | 2021-07-30 | 武汉信测标准技术服务有限公司 | Multiplexing voltage drop test circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180514 Address after: No. 188, Miyun District, Miyun District, Beijing, Beijing Patentee after: Beijing treasure Car Co.,Ltd. Address before: 102206, Beijing, Shahe Town, Changping District Road, sand Yang Patentee before: BEIQI FOTON MOTOR Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |