CN106168636A - Battery voltage acquisition circuit for battery management system - Google Patents
Battery voltage acquisition circuit for battery management system Download PDFInfo
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- CN106168636A CN106168636A CN201610736052.4A CN201610736052A CN106168636A CN 106168636 A CN106168636 A CN 106168636A CN 201610736052 A CN201610736052 A CN 201610736052A CN 106168636 A CN106168636 A CN 106168636A
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- battery
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- management system
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- 230000005611 electricity Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 abstract description 6
- 238000004891 communication Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000000178 monomer Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 102100035042 Histone-lysine N-methyltransferase EHMT2 Human genes 0.000 description 1
- 101000877312 Homo sapiens Histone-lysine N-methyltransferase EHMT2 Proteins 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
-
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
nullThe present invention relates to a kind of low cost、Reliability is high、The battery voltage acquisition circuit for battery management system that sampling precision is high，Including gating chip、Single-chip microcomputer and set of cells，Multiple battery being sequentially connected in series it is provided with in set of cells，The positive pole of multiple batteries is all connected by wire resettable fuse，Multiple resettable fuses are all connected by wire in addition to the resettable fuse being connected with first battery and has the first resistance，First battery is the battery near battery electrode one end，Multiple first resistance electrically connect with the corresponding input gating chip respectively，The resettable fuse connected with first battery is connected by the corresponding input of wire with gating chip，Multiple inputs of gating chip are connected with the negative pole of set of cells by the second resistance the most respectively，Gating chip is connected with the outfan of single-chip microcomputer by IIC interface，The outfan of gating chip is connected with the AD input of single-chip microcomputer by voltage follower.
Description
Technical field
The present invention relates to a kind of voltage collection circuit, particularly relate to a kind of battery voltage acquisition for battery management system
Circuit.
Background technology
Cell voltage is the important parameter of electric automobile power battery, on the one hand cell voltage directly with residual capacity phase
Closing, on the other hand battery works long hours under low pressure or overpressure situation, has a strong impact on its shelf-life, therefore battery voltage detection
Precision is to weigh the important indicator of battery management system.
At present, in battery management system, the topological structure of battery voltage acquisition circuit is varied, mainly has a following four:
Scheme 1: external semiconductor chip manufacturer provides special chip to gather cell voltage, typically could support up 12 string monomers
Cell voltage, built-in AD conversion unit, processed delivering to single-chip microcomputer in battery voltage information, simultaneously by communication interface
Expanding universal digital input-output interface, it is simple to current acquisition, temperature acquisition, major vendor has Linear, TI, ADI, Maxim
In company.
Scheme 2: use the mode of optocoupler to be acquired, including gating unit, for gating cell to be detected；The
One optocoupler, for being converted to current signal and exporting the first voltage signal of a correspondence by cell voltage to be detected；Signal transmits
Unit, for passing to the second optocoupler by described voltage signal；Second optocoupler, for described first voltage signal transmission come
Be converted to the second voltage signal；Ratio circuit, for being converted to measure magnitude of voltage by described voltage signal.
Scheme 3: utilizing multiple collecting unit and controller to realize battery voltage acquisition, described collecting unit includes battery
Ci, control switch Qi1 and circuit switching Qi2, the battery Ci of each adjacent collecting unit is sequentially connected in series by positive pole, negative pole, and V1
Negative pole connect public terminal GND, the positive pole of described battery Ci by resistance Ri1 connect resistance R0 one end, resistance R0's is another
One end connects public terminal GND, also series loop switch Qi2, this time in the loop of described battery Ci, resistance Ri1 and resistance R0
Parallel Control switch Qi1 between control end and the public terminal of way switch Qi2, the control end of described control switch Qi1 connects control
The outfan KZi of device processed, the input of this controller connects one end that resistance R0 with Ri1 is connected.
Scheme 4: provide an identical reference voltage to give the in-phase input end of multiple operational amplifier, operational amplifier
Inverting input connects each monomer battery voltage, draws the relative voltage difference of each cell and described reference voltage.?
Synchronization measures voltage difference values among single batteries, eliminates common-mode voltage and bus pulsating current changes measurement result
Impact；Meanwhile, the monomer battery voltage measurement circuit of the present invention spatially very close to tested cell, largely reducing
The electromagnetic interference faradic current impact on measurement result in background technology.
Battery management system constantly expands along with Development of Electric Vehicles, and function is the most perfect, but existing above-mentioned
Several schemes yet suffer from deficiency:
(1) appearance of special chip makes battery management system design be greatly simplified, and miniaturization and the reliability of product have
Improving, it is contemplated that voltage and application complexity, the battery strings number of general one single chip detection, less than 12 strings, uses this
The battery management system typical architecture of a little chip designs is centralized configuration, battery case internal wiring can be made multiple for distributed frame
Miscellaneous, reduce reliability, and increase holistic cost.The functional design of product is limited by the configuration of chip manufacturer, reduces overall spirit
Activity.
(2) mode occurred along with special chip is to use optocoupler to gather information of voltage, utilizes the characteristic of optocoupler, a side
Face is capable of, to single battery information of voltage collection, on the other hand realizing electrical isolation, improves reliability, utilizes the electricity of optocoupler
Streaming characteristic makes it work in linear zone, the voltage signal collected is converted to current signal and is transmitted to secondary.The program
Sampling time is limited by optocoupler switching time, and the sampling time is long, and is difficult to ensure that optocoupler works in linear zone, sampling precision all the time
Low, peripheral circuit is the most complicated, poor reliability.
(3) scheme 3 uses multiple collecting unit and controller to realize battery voltage acquisition, realizes electricity by multiple audions
Pond selects and information of voltage collection, and audion belongs to current mode device, drives electric current big, and power consumption increases, and increases electrokinetic cell consumption
Electricity, reduces car load distance travelled.Audion is divided into cut-off region, amplification region, working region, three, saturation region, and the method can only make
Triode operation is in saturation region and cut-off region, when working in amplification region, due to the reasons such as audion self pressure drop can cause be
The voltage acquisition precision of system reduces.
(4) operational amplifier is utilized to be capable of Quick Acquisition and the low cost of voltage, but voltage in scheme 4
Acquisition precision is limited by reference voltage, for the electromagnetic environment that vehicle is harsh, easily causes reference voltage to change, and then impact electricity
Cell voltage acquisition precision.
Because above-mentioned defect, the design people, the most in addition research and innovation, to founding the battery of a kind of new structure
Voltage collection circuit so that it is have more the value in industry.
Summary of the invention
For solving above-mentioned technical problem, it is an object of the invention to provide a kind of low cost, reliability is high, sampling precision is high
Battery voltage acquisition circuit for battery management system.
The battery voltage acquisition circuit for battery management system of the present invention, including gating chip, single-chip microcomputer and battery
Group, is provided with multiple battery being sequentially connected in series in described set of cells, the positive pole of multiple batteries is all connected by wire has self-recoverage to protect
Danger silk, all has the by wire connection in multiple resettable fuses in addition to the resettable fuse being connected with first battery
One resistance, described first battery is the battery near battery electrode one end, multiple first resistance respectively with gating chip
Corresponding input electrical connection, the resettable fuse connected with first battery corresponding input by wire with gating chip
Connecting, multiple inputs of described gating chip are connected with the negative pole of set of cells by the second resistance the most respectively, described gating core
Sheet is connected with the outfan of single-chip microcomputer by IIC interface, the outfan of the gating chip AD by voltage follower with single-chip microcomputer
Input connects.
Further, the battery voltage acquisition circuit for battery management system of the present invention, also include power supply circuits, institute
The positive pole of the input and set of cells of stating power supply circuits is connected, and the outfan of power supply circuits inputs with the power supply gating chip respectively
End, the power input of voltage follower connect.
Further, the battery voltage acquisition circuit for battery management system of the present invention, described power supply circuits are string
Connection mu balanced circuit.
Further, the battery voltage acquisition circuit for battery management system of the present invention, the number of described battery is 8
Individual, described gating chip is 8 passage gating chips.
By such scheme, the present invention at least has the advantage that the battery electricity for battery management system of the present invention
Pressure Acquisition Circuit, by arranging resettable fuse in circuit, thus damages battery, protects after preventing Acquisition Circuit from breaking down
Protect circuit safety to run reliably.Fusting current selects according to late-class circuit maximum operating currenbt, is typically chosen for
0.125A.In addition the first resistance and the setting of the second resistance, constitutes high-precision electric resistance partial pressure, thus realizes each monomer electricity
Cell voltage and the detection of total voltage, the voltage signal collected is transferred into corresponding gating circuit interface, with low cost.Actual
During use, select high resistance measurement as far as possible, reduce resistance power loss, prevent from, because resistance temperature change causes change in resistance, carrying
High voltage acquisition precision.Additionally, select gating chip to receive the voltage signal of battery, gating chip is communicated by the IIC carried
Interface and single chip communication, the input channel of gating chip is selected by single-chip microcomputer by IIC communication interface, gating chip
Output interface sends into the AD passage of single-chip microcomputer through voltage follower, and 16 the AD passages utilizing single-chip microcomputer to carry can effectively carry
The acquisition precision of high cell voltage.In sum, the battery voltage acquisition circuit cost for battery management system of the present invention
Low, reliability is high, sampling precision is high.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of description, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.
Accompanying drawing explanation
Fig. 1 is the present invention circuit theory diagrams for the battery voltage acquisition circuit of battery management system；
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is described in further detail.Hereinafter implement
Example is used for illustrating the present invention, but is not limited to the scope of the present invention.
See Fig. 1, a kind of battery voltage acquisition circuit for battery management system of a preferred embodiment of the present invention, bag
Include gating chip U1, single-chip microprocessor MCU and set of cells BAT1～BAT8, in described set of cells, be provided with multiple battery being sequentially connected in series,
The positive pole of multiple batteries is all connected by wire resettable fuse (F1～F8), except with the in multiple resettable fuses
The resettable fuse (F8) that one battery connects the most all by wire connection have the first resistance (R1, R2, R3, R5, R6, R9,
R10), described first battery (BAT1) is the battery near battery electrode one end, multiple first resistance respectively with gating core
Corresponding input (the port 1～7) electrical connection of sheet, the resettable fuse being connected with first battery is by wire and gating core
The corresponding input (port 8) of sheet connects, multiple inputs of described gating chip the most respectively by the second resistance (R14～
R21) being connected with the negative pole of set of cells, described gating chip is defeated by IIC interface (Scl port and Sda port) and single-chip microcomputer
Going out end to connect, the outfan of gating chip is connected with the AD input of single-chip microcomputer by voltage follower U2.
By arranging resettable fuse in circuit, thus after preventing Acquisition Circuit from breaking down, damage battery, protection
Circuit safety runs reliably.Fusting current selects according to late-class circuit maximum operating currenbt, is typically chosen for
0.125A.In addition the first resistance and the setting of the second resistance, constitutes high-precision electric resistance partial pressure, thus realizes each monomer electricity
Cell voltage and the detection of total voltage, the voltage signal collected is transferred into corresponding gating circuit interface, with low cost.Actual
During use, select high resistance measurement as far as possible, reduce resistance power loss, prevent from, because resistance temperature change causes change in resistance, carrying
High voltage acquisition precision.Additionally, select gating chip to receive the voltage signal of battery, gating chip is communicated by the IIC carried
Interface and single chip communication, the input channel of gating chip is selected by single-chip microcomputer by IIC communication interface, gating chip
Output interface sends into the AD passage of single-chip microcomputer through voltage follower, and 16 the AD passages utilizing single-chip microcomputer to carry can effectively carry
The acquisition precision of high cell voltage.In sum, the battery voltage acquisition circuit cost for battery management system of the present invention
Low, reliability is high, sampling precision is high.
As preferably, the battery voltage acquisition circuit for battery management system of the present invention, also include power supply circuits
101, the input of power supply circuits is connected with the positive pole of set of cells, and the outfan of power supply circuits is defeated with the power supply of gating chip respectively
Enter end, the power input of voltage follower connects.
As preferably, the battery voltage acquisition circuit for battery management system of the present invention, power supply circuits are steady for series connection
Volt circuit.
The battery voltage acquisition circuit for battery management system of the present invention utilize serial regulating circuit to gating chip,
Operational amplifier and single-chip microcomputer are powered, and serial voltage regulation circuit belongs to the one in D.C. regulated power supply, in actual application circuit
Widely, serial regulating circuit is directly from battery electricity-taking, and its output does not changes along with battery voltage ripple in application, output essence
Degree is high and stable, it is ensured that in circuit, each device works in normal condition.
As preferably, the battery voltage acquisition circuit for battery management system of the present invention, the number of battery is 8,
Gating chip is 8 passage gating chips.
Below it is only the preferred embodiment of the present invention, is not limited to the present invention, it is noted that this technology is led
For the those of ordinary skill in territory, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and modification,
These improve and modification also should be regarded as protection scope of the present invention.
Claims (4)
1. the battery voltage acquisition circuit for battery management system, it is characterised in that: include gating chip, single-chip microcomputer and
Set of cells, is provided with multiple battery being sequentially connected in series in described set of cells, the positive pole of multiple batteries is all connected by wire to be had from extensive
Double insurance silk, is all connected by wire in multiple resettable fuses in addition to the resettable fuse being connected with first battery
Having the first resistance, described first battery is the battery near battery electrode one end, multiple first resistance respectively with gating core
The corresponding input electrical connection of sheet, the resettable fuse connected with first battery passes through wire and gates the corresponding defeated of chip
Entering end to connect, multiple inputs of described gating chip are connected with the negative pole of set of cells by the second resistance the most respectively, described choosing
Obturator sheet is connected with the outfan of single-chip microcomputer by IIC interface, and the outfan of gating chip is by voltage follower and single-chip microcomputer
AD input connect.
Battery voltage acquisition circuit for battery management system the most according to claim 1, it is characterised in that: also include
Power supply circuits, the input of described power supply circuits is connected with the positive pole of set of cells, the outfan of power supply circuits respectively with gating core
The power input of sheet, the power input of voltage follower connect.
Battery voltage acquisition circuit for battery management system the most according to claim 2, it is characterised in that: described confession
Electricity circuit is serial regulating circuit.
Battery voltage acquisition circuit for battery management system the most according to claim 1, it is characterised in that: described electricity
The number in pond is 8, and described gating chip is 8 passage gating chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610736052.4A CN106168636A (en) | 2016-08-26 | 2016-08-26 | Battery voltage acquisition circuit for battery management system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610736052.4A CN106168636A (en) | 2016-08-26 | 2016-08-26 | Battery voltage acquisition circuit for battery management system |
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| CN106168636A true CN106168636A (en) | 2016-11-30 |
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| CN201610736052.4A Pending CN106168636A (en) | 2016-08-26 | 2016-08-26 | Battery voltage acquisition circuit for battery management system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966987A (en) * | 2017-11-27 | 2018-04-27 | 北京新能源汽车股份有限公司 | Constant-speed cruise signal acquisition circuit, constant-speed cruise control system and automobile |
| 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) |
| CN109683099A (en) * | 2018-12-24 | 2019-04-26 | 咕咚网络（北京）有限公司 | A kind of battery voltage acquisition circuit of Wireless Networking door lock |
| CN111769615A (en) * | 2020-07-09 | 2020-10-13 | 珠海迈巨微电子有限责任公司 | Operational amplifier power supply device, power supply method and battery management system |
| CN112731189A (en) * | 2021-01-26 | 2021-04-30 | 清华大学 | Battery pack simulation and BMS precision detection system |
| CN114856009A (en) * | 2022-05-19 | 2022-08-05 | 长沙同强电子科技有限公司 | Electroosmosis pulse anti-permeability dehumidification system and method |
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| CN203365536U (en) * | 2013-06-18 | 2013-12-25 | 深圳市沃特玛电池有限公司 | Voltage acquisition circuit of low-energy-consumption lithium ion battery |
| CN203490316U (en) * | 2013-08-29 | 2014-03-19 | 合肥国轩高科动力能源股份公司 | Anti-connection-missing detection circuit for voltage acquisition flat cable |
| CN206038760U (en) * | 2016-08-26 | 2017-03-22 | 山东天海科技股份有限公司 | A battery voltage acquisition circuit for battery management system |
-
2016
- 2016-08-26 CN CN201610736052.4A patent/CN106168636A/en active Pending
Patent Citations (3)
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| CN203365536U (en) * | 2013-06-18 | 2013-12-25 | 深圳市沃特玛电池有限公司 | Voltage acquisition circuit of low-energy-consumption lithium ion battery |
| CN203490316U (en) * | 2013-08-29 | 2014-03-19 | 合肥国轩高科动力能源股份公司 | Anti-connection-missing detection circuit for voltage acquisition flat cable |
| CN206038760U (en) * | 2016-08-26 | 2017-03-22 | 山东天海科技股份有限公司 | A battery voltage acquisition circuit for battery management system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966987A (en) * | 2017-11-27 | 2018-04-27 | 北京新能源汽车股份有限公司 | Constant-speed cruise signal acquisition circuit, constant-speed cruise control system and automobile |
| CN107966987B (en) * | 2017-11-27 | 2021-01-15 | 北京新能源汽车股份有限公司 | Constant-speed cruise signal acquisition circuit, constant-speed cruise control system and automobile |
| 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) |
| CN109683099A (en) * | 2018-12-24 | 2019-04-26 | 咕咚网络（北京）有限公司 | A kind of battery voltage acquisition circuit of Wireless Networking door lock |
| CN111769615A (en) * | 2020-07-09 | 2020-10-13 | 珠海迈巨微电子有限责任公司 | Operational amplifier power supply device, power supply method and battery management system |
| CN111769615B (en) * | 2020-07-09 | 2021-01-22 | 珠海迈巨微电子有限责任公司 | Operational amplifier power supply device, power supply method and battery management system |
| CN112731189A (en) * | 2021-01-26 | 2021-04-30 | 清华大学 | Battery pack simulation and BMS precision detection system |
| CN114856009A (en) * | 2022-05-19 | 2022-08-05 | 长沙同强电子科技有限公司 | Electroosmosis pulse anti-permeability dehumidification system and method |
| CN114856009B (en) * | 2022-05-19 | 2023-08-29 | 长沙同强电子科技有限公司 | Electroosmosis pulse anti-seepage dehumidification system and method |
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Application publication date: 20161130 |