CN109683098A - A kind of current detecting system for electrokinetic cell system - Google Patents
A kind of current detecting system for electrokinetic cell system Download PDFInfo
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- CN109683098A CN109683098A CN201811558011.6A CN201811558011A CN109683098A CN 109683098 A CN109683098 A CN 109683098A CN 201811558011 A CN201811558011 A CN 201811558011A CN 109683098 A CN109683098 A CN 109683098A
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Abstract
The present invention relates to electrokinetic cell system technical fields, more particularly to a kind of current detecting system for electrokinetic cell system, including a battery management system chip, battery management system chip includes a comparator circuit, one data selector circuit, one analog-digital converter, it is compared by the normal phase input end signal of comparator circuit with negative-phase input signal, determine the positive and negative of output signal, and then control the gating of data selector circuit, guarantee that the difference mode signal of the input of analog-digital converter is positive, can satisfy the signal input range requirement of analog-digital converter in this way.The technical program the utility model has the advantages that in entire electrokinetic cell system, voltage checking chip can be saved, realize that single power battery managing chip completes the detection of the functions such as voltage, electric current.
Description
Technical field
The present invention relates to electrokinetic cell system technical field more particularly to a kind of current detectings for electrokinetic cell system
System.
Background technique
With the popularization and use of new-energy automobile, people are also higher and higher to the technical requirements of new-energy automobile.Exist at present
In electric car, BMS (Battery Management System, battery management system) is about 30% in the accounting of cost
More than, therefore automobile factory is especially taken a fancy to power battery production technology in BMS is improved.Efficient BMS system, it is meant that automobile can
With farther cruising ability, and in BMS system, battery generally has a following parameter: voltage, battery capacity, energy density,
SOC (State Of Charge, state-of-charge are also referred to as remaining capacity), internal resistance, service life etc..
In electric car, battery pack realizes high voltage and large capacity using single battery series, parallel in BMS, therefore
The consistency of single battery also becomes a parameter.Single battery leads to inside since technique in the fabrication process is inconsistent
Structure and material have difference, thus having differences property.And BMS chip is exactly to detect single battery state, then main control
Device can carry out corresponding operation (such as battery balanced) according to the state of acquisition.Wherein, SOC is defined as residual capacity and accounts for battery
The ratio of capacity accurately estimates SOC for characterizing the surplus capacity of power battery, be improve electric car course continuation mileage with
And the key link of battery life.
In electrokinetic cell system, the current methods for measuring electrokinetic cell system at present mainly have: current divider method, Hall pass
Sensor method etc..In view of in currently existing scheme, current acquisition requires additional component (such as Hall sensor or voltage detecting
Chip etc.), cost is increased, and calibration process is complicated, it is therefore desirable to a new electrokinetic cell system current detection technology.
Summary of the invention
In view of the above-mentioned defects in the prior art, the present invention provides a kind of current detecting system for electrokinetic cell system.
Specific technical solution is as follows:
A kind of current detecting system for electrokinetic cell system, including:
One battery management system chip, the battery management system chip include:
One comparator circuit, the normal phase input end of the comparator circuit connect the first of the battery management system chip
Pin, the negative-phase input of the comparator circuit connect the second pin of the battery management system chip, by comparing institute
State the positive and negative of the signal of the size decision comparator circuit output of positive phase input signal and negative input signal；
One data selector circuit, the data selector circuit include that the first data selector and the second data select
Device, the first pin of the battery management system chip are separately connected the first signal end of first data selector and described
The second signal end of second data selector, the second pin of the battery management system chip are separately connected first data
First signal end at the second signal end of selector and second data selector；
One analog-digital converter, the input terminal of the analog-digital converter connect the output end of the data selector circuit, use
Digital signal is converted to the analog signal for inputting the data selector circuit and is exported；
The output end of the analog-digital converter connects the input terminal of a microcontrol processor, to by the analog-digital converter
The digital signal of output is sent to the microcontrol processor and is analyzed and processed, and the electric current is monitored and is managed.
Further, the positive and negative of the signal of the comparator circuit output is relatively exported by following:
When the normal phase input end signal is greater than the negative-phase input signal, the signal of the comparator circuit output
It is positive；
When the normal phase input end signal is less than the negative-phase input signal, the signal of the comparator circuit output
It is negative.
Further, the signal of the comparator circuit output is used to control the gating of the data selector circuit.
Further, the output end of first data selector connects the first input end of the analog-digital converter；Institute
The output end for stating the second data selector connects the second input terminal of the analog-digital converter.
Further, when Yu Suoshu electrokinetic cell system is in discharge condition, the signal of the comparator circuit output is
Just, the first signal end of first data selector and the first signal end of second data selector are gated；
When the electrokinetic cell system is in charged state, the signal of the comparator circuit output is negative, and gates institute
State the second signal end of the first data selector and the second signal end of second data selector.
Further, the current detecting system further includes a current divider, is connected to the battery management system chip
Between first pin and the second pin of the battery management system chip.
Further, first data selector and second data selector include an enable end, for described
First data selector and the second data selector on-off.
Further, when the enabled end signal is 1, first data selector and second data selector
Connection；
When the enabled end signal is 0, the disconnection of first data selector and second data selector.
Technical solution of the present invention beneficial effect is:
The gating of data selector is controlled by the output end of comparator, guarantees the difference mode signal of the input of analog-to-digital conversion device
It is positive, the signal input range requirement that can satisfy analog-digital converter in this way can save electricity in entire electrokinetic cell system
Detection chip is pressed, realizes that single power battery managing chip completes the detection of the functions such as voltage, electric current.
Detailed description of the invention
Fig. 1 is the functional block diagram of the current detecting system for electrokinetic cell system of the embodiment of the present invention；
Fig. 2 a is the comparator circuit figure of the battery management system chip of the embodiment of the present invention；
Fig. 2 b is the data selector and analog-digital converter circuit figure of the battery management system chip of the embodiment of the present invention；
When Fig. 3 is that the electrokinetic cell system of the embodiment of the present invention is in discharge condition, the circuit connection diagram of signal path；
When Fig. 4 is that the electrokinetic cell system of the embodiment of the present invention is in charged state, the circuit connection diagram of signal path.
In attached drawing: 1, comparator circuit；2, data selector circuit；3, analog-digital converter；4, battery management system chip
The first pin；5, the second pin of battery management system chip；6, current divider
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
1 to attached drawing 4 and specific embodiment, the invention will be further described with reference to the accompanying drawing, but not as of the invention
It limits.
As shown in attached drawing 1, attached drawing 2a and attached drawing 2b, a kind of current detecting system for electrokinetic cell system, wherein wrapping
It includes:
One battery management system chip, battery management system chip include:
One comparator circuit 1, the first pin 4 of the normal phase input end connection battery management system chip of comparator circuit,
The second pin 5 of the negative-phase input connection battery management system chip of comparator circuit, by comparing positive phase input signal and
The size of negative input signal determines that the signal VOUT's of comparator circuit output is positive and negative；
One data selector circuit 2, data selector circuit include the first data selector M1 and the second data selector
M2, the first pin 4 of battery management system chip are separately connected the number of the first signal end S1 and second of the first data selector M1
According to the second signal end S2 of selector M2, the second pin 5 of battery management system chip is separately connected the first data selector M1
Second signal end S2 and the second data selector M2 the first signal end S1；
One analog-digital converter 3, the output end D of input terminal X1, X2 connection data selector circuit of analog-digital converter, to
The analog signal that data selector circuit inputs is converted into digital signal and is exported；
The input terminal of the one microcontrol processor MCU of output terminals A DC OUT connection of analog-digital converter 3, to turn modulus
The digital signal that parallel operation 3 exports is sent to microcontrol processor MCU and is analyzed and processed, and electric current is monitored and is managed.
In through the above technical solution, Ic indicates charging current, and Id indicates that discharge current, BAT+ are that the anode of battery pack is defeated
Out, BAT- is the output of battery pack cathode, and current divider 6 is equivalent to resistance R, Rf and Cf composition low-pass filter, passes through cell tube
The normal phase input end signal of comparator circuit 1 in reason System on Chip/SoC compares with negative-phase input signal, determines output signal
It is positive and negative, and then control the gating of data selector circuit 2, guarantee that the difference mode signal of input of analog-digital converter 3 is positive, in this way
It can satisfy the signal input range requirement of analog-digital converter 3, and then single battery management system chip and micro-control may be implemented
The monitoring and management of entire electrokinetic cell system are completed in communication between device MCU processed.
As preferred embodiment, in comparator circuit 1:
When normal phase input end signal is greater than the negative-phase input signal, the signal of comparator circuit output is positive；
When normal phase input end signal is less than the negative-phase input signal, the signal of comparator circuit output is negative；
Above-mentioned technical proposal, by comparing the size of positive input terminal signal and negative input end signal, determination data selector
The gating of circuit 2 guarantees that the difference mode signal of the input of analog-digital converter 3 is positive, meets the management of power battery management system.
As preferred embodiment, the signal of comparator circuit output VOUT is used to control the choosing of data selector circuit 2
It is logical；
The first input end X1 of the output end D VIN+ connection analog-digital converter of first data selector M1；The choosing of second data
Select the second input terminal X2 of the output end D VIN- connection analog-digital converter of device M2；
When electrokinetic cell system is in discharge condition, the signal of comparator circuit output VOUT is positive, the first number of gating
According to the first signal end S1 of selector and the first signal end S1 of the second data selector；
When electrokinetic cell system is in charged state, the signal of comparator circuit output is negative, gating the first data choosing
Select the second signal end S2 of the second signal end S2 and the second data selector M2 of device M1.
In above-mentioned technical proposal, the gating of the signal control data selector circuit 2 of VOUT is exported using comparator circuit,
When electrokinetic cell system is in discharge condition, the signal of output is positive, the first letter of the first data selector of signal gating M1
The first signal end S1 of number end S1 and the second data selector M2, signal path is as shown in Figure 3；It is filled when electrokinetic cell system is in
When electricity condition, the signal of output is negative, the second signal end S2 of the first data selector of signal gating M1 and the selection of the second data
The second signal end S2 of device M2, signal path is as shown in figure 4, guarantee real-time accurate monitoring and the pipe of entire electrokinetic cell system
Reason.
As preferred embodiment, current detecting system further includes a current divider 6, is connected to battery management system chip
Between first pin 4 and the second pin 5 of battery management system chip, for measuring both ends DC current, guarantee battery management
System on Chip/SoC works normally.
As preferred embodiment, the first data selector M1 and the second data selector M2 include an enable end ENB, are used
In the first data selector M1 and the second data selector M2 on-off；
When enabled end signal is 1, the first data selector M1 and the second data selector M2 are connected；
When enabled end signal is 0, the first data selector M1 and the second data selector M2 are disconnected.
Above-mentioned technical proposal controls the logical of the first data selector M1 and the second data selector M2 by enable end ENB
It is disconnected, guarantee that chip works normally, conducive to the management and monitoring of entire electrokinetic cell system.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (8)
1. a kind of current detecting system for electrokinetic cell system characterized by comprising
One battery management system chip, the battery management system chip include:
One comparator circuit, what the normal phase input end of the comparator circuit connected the battery management system chip first draws
Foot, the negative-phase input of the comparator circuit connect the second pin of the battery management system chip, by comparing described
The size of positive phase input signal and negative input signal determines the positive and negative of the signal of the comparator circuit output；
One data selector circuit, the data selector circuit include the first data selector and the second data selector, institute
The first pin for stating battery management system chip is separately connected the first signal end and described second of first data selector
The second signal end of data selector, the second pin of the battery management system chip are separately connected the first data selection
First signal end at the second signal end of device and second data selector；
One analog-digital converter, the input terminal of the analog-digital converter connect the output end of the data selector circuit, to incite somebody to action
The analog signal of the data selector circuit input is converted to digital signal and exports；
The output end of the analog-digital converter connects the input terminal of a microcontrol processor, to export the analog-digital converter
Digital signal be sent to the microcontrol processor and be analyzed and processed, and the electric current is monitored and is managed.
2. the current detecting system according to claim 1 for electrokinetic cell system, which is characterized in that in the comparison
In device circuit:
When the positive phase input signal is greater than the negative input signal, the signal of the comparator circuit output is positive；
When the positive phase input signal is less than the negative input signal, the signal of the comparator circuit output is negative.
3. the current detecting system according to claim 1 for electrokinetic cell system, which is characterized in that the comparator
The signal of circuit output is used to control the gating of the data selector circuit.
4. the current detecting system according to claim 1 for electrokinetic cell system, which is characterized in that first number
The first input end of the analog-digital converter is connected according to the output end of selector；
The output end of second data selector connects the second input terminal of the analog-digital converter.
5. the current detecting system according to claim 3 for electrokinetic cell system, which is characterized in that Yu Suoshu power
When battery system is in discharge condition, the signal of the comparator circuit output is positive, and gates first data selector
First signal end of the first signal end and second data selector.
When the electrokinetic cell system is in charged state, the signal of comparator circuit output is negative, and gates described the
The second signal end at the second signal end of one data selector and second data selector.
6. the current detecting system according to claim 1 for electrokinetic cell system, which is characterized in that the electric current inspection
Examining system further includes a current divider, is connected to the first pin and the battery management system core of the battery management system chip
Between the second pin of piece.
7. the current detecting system according to claim 1 for electrokinetic cell system, which is characterized in that first number
Include an enable end according to selector and second data selector, is used for first data selector and second data
The on-off of selector.
8. the current detecting system according to claim 7 for electrokinetic cell system, which is characterized in that when described enabled
When the signal at end is 1, first data selector is connected with second data selector；
When the signal of the enable end is 0, first data selector and second data selector are disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558011.6A CN109683098B (en) | 2018-12-19 | 2018-12-19 | Current detection system for power battery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811558011.6A CN109683098B (en) | 2018-12-19 | 2018-12-19 | Current detection system for power battery system |
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| Publication Number | Publication Date |
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| CN109683098A true CN109683098A (en) | 2019-04-26 |
| CN109683098B CN109683098B (en) | 2021-06-18 |
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|---|---|---|---|---|
| US20110298425A1 (en) * | 2003-06-19 | 2011-12-08 | O2Micro International Limited | Battery cell monitoring and balancing circuit |
| CN102882248A (en) * | 2011-07-15 | 2013-01-16 | 凹凸电子（武汉）有限公司 | Battery management systems with vertical bus circuits |
| CN203587662U (en) * | 2013-10-28 | 2014-05-07 | 无锡中星微电子有限公司 | Current detecting circuit and rechargeable battery |
| CN107843842A (en) * | 2017-09-25 | 2018-03-27 | 中派科技（深圳）有限责任公司 | Battery status monitoring system and method |
| CN108574120A (en) * | 2017-03-10 | 2018-09-25 | 凹凸电子（武汉）有限公司 | Battery system and its management method, battery management module and method |
| CN108594133A (en) * | 2018-05-18 | 2018-09-28 | 向玲丽 | A kind of lithium battery pressure differential detection circuit |
| CN108983867A (en) * | 2017-05-31 | 2018-12-11 | 台湾积体电路制造股份有限公司 | Voltage selection circuit |
-
2018
- 2018-12-19 CN CN201811558011.6A patent/CN109683098B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110298425A1 (en) * | 2003-06-19 | 2011-12-08 | O2Micro International Limited | Battery cell monitoring and balancing circuit |
| CN102882248A (en) * | 2011-07-15 | 2013-01-16 | 凹凸电子（武汉）有限公司 | Battery management systems with vertical bus circuits |
| CN203587662U (en) * | 2013-10-28 | 2014-05-07 | 无锡中星微电子有限公司 | Current detecting circuit and rechargeable battery |
| CN108574120A (en) * | 2017-03-10 | 2018-09-25 | 凹凸电子（武汉）有限公司 | Battery system and its management method, battery management module and method |
| CN108983867A (en) * | 2017-05-31 | 2018-12-11 | 台湾积体电路制造股份有限公司 | Voltage selection circuit |
| CN107843842A (en) * | 2017-09-25 | 2018-03-27 | 中派科技（深圳）有限责任公司 | Battery status monitoring system and method |
| CN108594133A (en) * | 2018-05-18 | 2018-09-28 | 向玲丽 | A kind of lithium battery pressure differential detection circuit |
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