CN206038760U - A battery voltage acquisition circuit for battery management system - Google Patents
A battery voltage acquisition circuit for battery management system Download PDFInfo
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- CN206038760U CN206038760U CN201620958461.4U CN201620958461U CN206038760U CN 206038760 U CN206038760 U CN 206038760U CN 201620958461 U CN201620958461 U CN 201620958461U CN 206038760 U CN206038760 U CN 206038760U
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- battery
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- gating
- management system
- acquisition circuit
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Abstract
The utility model relates to a with low costs, the reliability is high, sampling precision high a battery voltage acquisition circuit for battery management system, including the gating chip, singlechip and group battery, be equipped with a plurality of batteries of establishing ties in proper order in the group battery, the positive pole of a plurality of batteries all is connected with the self -resuming fuse through the wire, all be connected with first resistance through the wire in a plurality of self -resuming fuses except the self -resuming fuse of being connected with first battery, the battery of first battery for being close to group battery negative pole one end, a plurality of first resistance are connected with the corresponding input end electricity of gating chip respectively, the corresponding input end that the self -resuming fuse be connected with first battery passes through wire and gating chip is connected, the multiple input end of gating chip still is connected with the negative pole of group battery through second resistance respectively, the gating chip passes through the IIC interface and is connected with the output of singlechip, the output of gating chip passes through voltage follower and is connected with the AD input of singlechip.
Description
Technical field
This utility model is related to a kind of voltage collection circuit, more particularly to a kind of cell voltage for battery management system
Acquisition Circuit.
Background technology
Cell voltage is the important parameter of electric automobile power battery, one side cell voltage directly with residual capacity phase
Close, another aspect 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 following four：
Scheme 1：External semiconductor chip manufacturer provides special chip collection cell voltage, typically could support up 12 string monomers
Cell voltage, built-in AD conversion unit will be sent to single-chip microcomputer by communication interface and processed in battery voltage information, while
Expanding universal digital input-output interface, is easy to current acquisition, temperature acquisition, major vendor to have Linear, TI, ADI, Maxim
In company.
Scheme 2：It is acquired by the way of optocoupler, including gating unit, for gating cell to be detected；The
One optocoupler, for cell voltage to be detected is converted to current signal and a corresponding first voltage signal is exported；Signal transmission
Unit, for the voltage signal is passed to the second optocoupler；Second optocoupler, for the first voltage signal for carrying out transmission
Be converted to second voltage signal；Ratio circuit, for the voltage signal is converted to measurable magnitude of voltage.
Scheme 3：Battery voltage acquisition is realized using multiple collecting units and controller, the collecting unit includes battery
Ci, controlling switch Qi1 and circuit switching Qi2, the battery Ci of each adjacent collecting unit are sequentially connected in series by positive pole, negative pole, and V1
Negative pole connection public terminal GND, the positive pole of the battery Ci connects one end of resistance R0 by resistance Ri1, and resistance R0's is another
One end connects public terminal GND, also series loop switch Qi2, this time in the loop of the battery Ci, resistance Ri1 and resistance R0
Parallel Control switch Qi1 between the control end and public terminal of way switch Qi2, the control end connection control of controlling switch Qi1
The outfan KZi of device processed, the input of the controller connect one end that resistance R0 is connected with Ri1.
Scheme 4：The in-phase input end that one identical reference voltage gives multiple operational amplifiers is provided, operational amplifier
Inverting input connects each monomer battery voltage, draws the relative voltage difference value of each cell and the reference voltage.
Synchronization measures voltage difference values among single batteries, eliminates common-mode voltage and bus pulsating current changes to measurement result
Affect；Meanwhile, monomer battery voltage measurement circuit of the present utility model spatially very close to tested cell, is cut significantly
Impact of the electromagnetic interference faradic current to measurement result in weak background technology.
Battery management system is accompanied by Development of Electric Vehicles and constantly expands, function constantly improve, but existing above-mentioned
Several schemes yet suffer from deficiency：
(1) appearance of special chip causes battery management system design to greatly simplify, and the miniaturization and reliability of product have
Improve, it is contemplated that voltage and applying complexity, the battery strings number of general one single chip detection is gone here and there less than 12, uses this
The battery management system typical architecture of a little chip designs is centralized configuration, for distributed frame can make battery case internal wiring multiple
It is miscellaneous, reliability is reduced, and increases 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 using optocoupler collection voltages information, using the characteristic of optocoupler, a side
Face can be realized gathering single battery information of voltage, on the other hand realize electrical isolation, improve reliability, using the electricity of optocoupler
Streaming characteristic makes which work in linear zone, the voltage signal for collecting 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 excessively complicated, poor reliability.
(3) scheme 3 realizes battery voltage acquisition using multiple collecting units and controller, realizes electricity by multiple audions
Pond selects and information of voltage collection, and audion belongs to current mode device, and driving current is 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, the working region of saturation region three, and the method can only make
Triode operation in saturation region and cut-off region, when amplification region is worked in, due to the reasons such as audion itself pressure drop can cause be
The voltage acquisition precision of system is reduced.
(4) Quick Acquisition and low cost of voltage can be realized using operational amplifier, but voltage in scheme 4
Acquisition precision is limited by reference voltage, the electromagnetic environment harsh for vehicle, easily causes reference voltage to change, and then affects electricity
Cell voltage acquisition precision.
In view of above-mentioned defect, the design people, positive research and innovation in addition, to founding a kind of battery of new structure
Voltage collection circuit so as to more the value in industry.
Utility model content
To solve above-mentioned technical problem, the purpose of this utility model is to provide a kind of low cost, reliability height, sampling precision
The high battery voltage acquisition circuit for battery management system.
Battery voltage acquisition circuit for battery management system of the present utility model, including gating chip, single-chip microcomputer and
Set of cells, is provided with multiple batteries being sequentially connected in series in the set of cells, the positive pole of multiple batteries is connected with from extensive by wire
Double insurance silk, is connected by wire in multiple resettable fuses in addition to the resettable fuse being connected with first battery
Have a first resistor, first battery is the battery near battery electrode one end, multiple first resistors respectively with gating core
The corresponding input electrical connection of piece, it is corresponding defeated with gating chip by wire with the resettable fuse of first battery connection
Enter end connection, multiple inputs of the gating chip are also connected with the negative pole of set of cells by second resistance respectively, the choosing
Obturator piece is connected with the outfan of single-chip microcomputer by IIC interfaces, and the outfan for gating chip passes through voltage follower and single-chip microcomputer
AD inputs connection.
Further, the battery voltage acquisition circuit for battery management system of the present utility model, also including power supply electricity
Road, the input of the power supply circuits are connected with the positive pole of set of cells, the outfan of power supply circuits electricity respectively with gating chip
The power input connection of source input, voltage follower.
Further, the battery voltage acquisition circuit for battery management system of the present utility model, the power supply circuits
For serial regulating circuit.
Further, the battery voltage acquisition circuit for battery management system of the present utility model, the battery
Number is 8, and the gating chip is that 8 passages gate chip.
By such scheme, this utility model at least has advantages below：It is of the present utility model for battery management system
Battery voltage acquisition circuit, by arranging resettable fuse in circuit, so as to after preventing Acquisition Circuit from breaking down damage
Bad battery, protects circuit safety reliably to run.Fusting current is selected according to late-class circuit maximum operating currenbt, and one
As be chosen for 0.125A.In addition the setting of first resistor and second resistance, constitutes high-precision electric resistance partial pressure, right so as to realize
The detection of each monomer battery voltage and total voltage, the voltage signal for collecting are transferred into corresponding gating circuit interface, cost
It is cheap.When actually used, high resistance measurement is selected as far as possible, reduce resistance power loss, prevent from causing resistance because of resistance temperature change
Value changes, improve voltage acquisition precision.Additionally, the voltage signal of battery is received from gating chip, gating chip is by carrying
IIC communication interfaces and single chip communication, single-chip microcomputer by IIC communication interfaces to gate chip input channel select,
The output interface of gating chip sends into the AD passages of single-chip microcomputer, the 16 AD passages carried using single-chip microcomputer through voltage follower
The acquisition precision of cell voltage can be effectively improved.In sum, the battery electricity for battery management system of the present utility model
Pressure Acquisition Circuit low cost, reliability are high, sampling precision is high.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of description, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below
Describe in detail bright as after.
Description of the drawings
Fig. 1 is the circuit theory diagrams of the battery voltage acquisition circuit that this utility model is used for battery management system；
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate this utility model, but is not limited to scope of the present utility model.
Referring to Fig. 1, a kind of battery voltage acquisition electricity for battery management system of one preferred embodiment of this utility model
Road, including gating chip U1, single-chip microprocessor MCU and set of cells BAT1～BAT8, are provided with multiple being sequentially connected in series in the set of cells
Battery, the positive pole of multiple batteries are connected with resettable fuse (F1～F8) by wire, remove in multiple resettable fuses
The resettable fuse being connected with first battery (F8) outward by wire be connected with first resistor (R1, R2, R3, R5,
R6, R9, R10), first battery (BAT1) is the battery near battery electrode one end, multiple first resistors respectively with
Gating chip corresponding input (port 1～7) electrical connection, resettable fuse be connected with first battery pass through wire and
Corresponding input (port 8) connection of gating chip, multiple inputs of the gating chip also pass through second resistance respectively
(R14～R21) is connected with the negative pole of set of cells, and the gating chip passes through IIC interfaces (Scl ports and Sda ports) and monolithic
The outfan connection of machine, the outfan for gating chip are connected with the AD inputs of single-chip microcomputer by voltage follower U2.
By arranging resettable fuse in circuit, so as to prevent Acquisition Circuit from battery is damaged after breaking down, protection
Circuit safety reliably runs.Fusting current is selected according to late-class circuit maximum operating currenbt, is typically chosen for
0.125A.In addition the setting of first resistor and second resistance, constitutes high-precision electric resistance partial pressure, so as to realize to each monomer electricity
The detection of cell voltage and total voltage, the voltage signal for collecting are transferred into corresponding gating circuit interface, with low cost.It is actual
During use, high resistance measurement is selected as far as possible, reduce resistance power loss, prevent from causing change in resistance because of resistance temperature change, carry
High voltage acquisition precision.Additionally, the voltage signal of battery is received from gating chip, the IIC communications that chip passes through to carry are gated
Interface and single chip communication, single-chip microcomputer are selected to the input channel for gating chip by IIC communication interfaces, gate chip
Output interface sends into the AD passages of single-chip microcomputer through voltage follower, effectively can be carried using 16 AD passages that single-chip microcomputer is carried
The acquisition precision of high cell voltage.In sum, the battery voltage acquisition circuit for battery management system of the present utility model
Low cost, reliability are high, sampling precision is high.
Preferably, the battery voltage acquisition circuit for battery management system of the present utility model, also including power supply electricity
Road 101, the input of power supply circuits are connected with the positive pole of set of cells, the outfan of power supply circuits power supply respectively with gating chip
The power input connection of input, voltage follower.
Preferably, the battery voltage acquisition circuit for battery management system of the present utility model, power supply circuits are string
Connection mu balanced circuit.
Battery voltage acquisition circuit for battery management system of the present utility model is using serial regulating circuit to gating
Chip, operational amplifier and single-chip microcomputer are powered, and serial voltage regulation circuit belongs to the one kind in D.C. regulated power supply, in practical application electricity
Using widely in road, directly from battery electricity-taking, its output does not change serial regulating circuit with battery voltage ripple, defeated
Go out high precision and stablize, it is ensured that each device works in normal condition in circuit.
Preferably, the battery voltage acquisition circuit for battery management system of the present utility model, the number of battery is 8
Individual, gating chip is that 8 passages gate chip.
The above is only preferred implementation of the present utility model, be not limited to this utility model, it is noted that for
For those skilled in the art, on the premise of without departing from this utility model know-why, if can also make
Dry to improve and modification, these improve and modification also should be regarded as protection domain of the present utility model.
Claims (4)
1. a kind of battery voltage acquisition circuit for battery management system, it is characterised in that：Including gating chip, single-chip microcomputer and
Set of cells, is provided with multiple batteries being sequentially connected in series in the set of cells, the positive pole of multiple batteries is connected with from extensive by wire
Double insurance silk, is connected by wire in multiple resettable fuses in addition to the resettable fuse being connected with first battery
Have a first resistor, first battery is the battery near battery electrode one end, multiple first resistors respectively with gating core
The corresponding input electrical connection of piece, it is corresponding defeated with gating chip by wire with the resettable fuse of first battery connection
Enter end connection, multiple inputs of the gating chip are also connected with the negative pole of set of cells by second resistance respectively, the choosing
Obturator piece is connected with the outfan of single-chip microcomputer by IIC interfaces, and the outfan for gating chip passes through voltage follower and single-chip microcomputer
AD inputs connection.
2. the battery voltage acquisition circuit for battery management system according to claim 1, it is characterised in that：Also include
Power supply circuits, the input of the power supply circuits are connected with the positive pole of set of cells, the outfan of power supply circuits respectively with gating core
The power input of piece, the power input connection of voltage follower.
3. the battery voltage acquisition circuit for battery management system according to claim 2, it is characterised in that：The confession
Circuit is serial regulating circuit.
4. the battery voltage acquisition circuit for battery management system according to claim 1, it is characterised in that：The electricity
The number in pond is 8, and the gating chip is that 8 passages gate chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620958461.4U CN206038760U (en) | 2016-08-26 | 2016-08-26 | A battery voltage acquisition circuit for battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620958461.4U CN206038760U (en) | 2016-08-26 | 2016-08-26 | A battery voltage acquisition circuit for battery management system |
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| Publication Number | Publication Date |
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| CN206038760U true CN206038760U (en) | 2017-03-22 |
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| CN201620958461.4U Active CN206038760U (en) | 2016-08-26 | 2016-08-26 | A battery voltage acquisition circuit for battery management system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168636A (en) * | 2016-08-26 | 2016-11-30 | 山东天海科技股份有限公司 | Battery voltage acquisition circuit for battery management 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 |
| CN109975714A (en) * | 2019-03-27 | 2019-07-05 | 广西电网有限责任公司防城港供电局 | A kind of voltage check device, detection system and the method for compatible multiple voltage |
-
2016
- 2016-08-26 CN CN201620958461.4U patent/CN206038760U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106168636A (en) * | 2016-08-26 | 2016-11-30 | 山东天海科技股份有限公司 | Battery voltage acquisition circuit for battery management 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 |
| CN109975714A (en) * | 2019-03-27 | 2019-07-05 | 广西电网有限责任公司防城港供电局 | A kind of voltage check device, detection system and the method for compatible multiple voltage |
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| GR01 | Patent grant |