CN105158573B - A kind of battery pack internal resistance detection circuit and battery pack internal resistance detection method and device - Google Patents
A kind of battery pack internal resistance detection circuit and battery pack internal resistance detection method and device Download PDFInfo
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- CN105158573B CN105158573B CN201510575049.4A CN201510575049A CN105158573B CN 105158573 B CN105158573 B CN 105158573B CN 201510575049 A CN201510575049 A CN 201510575049A CN 105158573 B CN105158573 B CN 105158573B
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Abstract
The invention discloses a kind of battery pack internal resistance detection circuit and battery pack internal resistance detection methods and device.Wherein, the battery pack internal resistance detection circuit includes：Injection Current module, the electric current Injection Signal for being sent according to control module, electric current is input in battery pack to be detected；Control module, for controlling Injection Current module, voltage detection module and multi-path choice module carry out cooperating, and finally obtain battery pack internal resistance；Voltage detection module, the voltage acquisition signal for being used for being sent according to control module carry out voltage detecting to the corresponding voltage of battery pack to be detected, and testing result are sent to control module；Multi-path choice module, the battery pack number to be detected for needing to detect according to control module, the voltage signal of battery pack to be detected is handled, and voltage signal is sent to the control module by treated.The present invention not only simplifies battery pack internal resistance detection circuit design structure, also reduces design cost.
Description
Technical field
The present invention relates to power electronics field, more particularly to a kind of battery pack internal resistance detection circuit and battery pack internal resistance
Detection method and device.
Background technology
Traditional detection method of accumulator capacity is to carry out whole group verification property electric discharge, i.e., accumulator group is connected to load
Then case discharges, until being put into blanking voltage (out of power) always, to verify the capacity of accumulator, but this method has
Many hidden danger and disadvantage:
A, discharge time is long, and risk is big, and battery pack palpus detachment system, the chemical energy that accumulator group is stored is all with thermal energy
Form consumes, and has not only wasted electric energy but also time-consuming and laborious, efficiency is low.
B, checking discharging test is carried out, it is necessary to have certain condition, first, the condition as far as possible in alternating current basic guarantee
Lower progress；Secondly, it is necessary to have battery backup.
C, verification electric discharge can only test whole group battery capacity, cannot test each section cell capacity, minimum with capacity
A section be used as whole group capacity, and other parts battery is since depth of discharge is inadequate, deterioration or fall behind degree can't be complete
Fully it is exposed.
D, the capacity of accumulator is damaged.Since the internal chemical reaction of accumulator is not completely reversibility.Full deep-cycle
The number of electric discharge is limited, so, it is not suitable for frequently carrying out deep discharge to lead-acid accumulator.But interval time is long, two
The state of accumulator between secondary verification is uncertain.After the capacity of accumulator drops to 80% or less, accumulator just enters
Decline State drastically, the decline phase is very short, may just fail some months after primary verification electric discharge, and electric within the remaining time
The existing great accident potential of pond group.
However, the characteristic of whole group battery charging is, as in battery pack there are one or the aged battery that becomes larger of several internal resistances,
Capacity necessarily becomes smaller, and when charger charges to battery pack, aged battery will be full of quickly because capacity is small.Charger can take for
Whole group battery has been filled with and switchs to floating charge state, is charged to battery pack with constant voltage and low current.Remaining electricity in good condition
Pond can not possibly be full of.Battery pack will carry out charge and discharge by standard of the capacity of aged battery, and through multiple floating charge, -- electric discharge -- is equal
Filling -- electric discharge --, the vicious circle of floating charge, capacity constantly decline, and the battery backup time shortens
During inventor carries out battery pack internal resistance detection, it is found that at least there are the following problems in the prior art：It is existing
In technical solution, battery pack internal resistance detection circuit is relative complex to mostly use operational amplifier, needs individually to power, circuit structure ratio
It is more complex.
Invention content
In view of the above problems, it is proposed that the present invention overcoming the above problem in order to provide one kind or solves at least partly
State a kind of battery pack internal resistance detection circuit and battery pack internal resistance detection method and device of problem.
One side according to the present invention, the present invention provides a kind of battery pack internal resistance detection circuit, which includes:Note
Enter current module, control module, voltage detection module and multi-path choice module；
The Injection Current module, the electric current Injection Signal for being sent according to the control module, electric current is input to
In battery pack to be detected；
The control module, for controlling the Injection Current module, the voltage detection module and multichannel choosing
It selects module and carries out cooperating, and finally obtain battery pack internal resistance；
The voltage detection module, the voltage acquisition signal for being used for being sent according to the control module, to described to be detected
The corresponding voltage of battery pack carries out voltage detecting, and testing result is sent to the control module；
The multi-path choice module, the battery pack number to be detected for needing to detect according to the control module, by institute
The voltage signal for stating battery pack to be detected is handled, and voltage signal is sent to the control module by treated.
Wherein, the Injection Current module includes：First optocoupler N1, the second optocoupler N2, first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the first capacitance
C1, the second capacitance C2 and first switch pipe M1, second switch pipe M2；
The first resistor R1 mono- terminates the control module, another termination the first optocoupler N1 anode taps；Described
One optocoupler N1 cathode terminals are grounded, and the first optocoupler N1 emitters terminate the control module and connect with the first switch pipe M1
End, the first optocoupler N1 collectors terminate the one end the 3rd resistor R3, and the 3rd resistor R3 is another to terminate described second
Switching tube M2 grids；
The first switch pipe M1 grids connect the second resistance R2, the first connecting pins capacitance C1, the 6th resistance R6；
The first switch pipe M1 drain electrodes connect the control module, and the first switch pipe M1 source electrodes connect the one end the 4th resistance R4；
Another termination control modules of second resistance R2, another termination control moulds of the first capacitance C1
Block, the emitter terminal of another termination the second optocoupler N2 of the 6th resistance R6；The 4th resistance R4 other ends connect respectively
The 5th resistance R5 and the control module；Another terminations of 5th resistance R5 second switch pipe M2 drain electrodes；
The anode of the second optocoupler N2 terminates the one end the 8th resistance R8, the cathode termination of the second optocoupler N2
The collector on ground, the second optocoupler N2 terminates the control module；Another termination control modules of 8th resistance R8；
The second switch pipe M2 source electrodes meet the control module and the 7th resistance R7, the second capacitance C2 respectively
Connecting pin；
Another termination second switch pipe M2 grids of 7th resistance R7；
Another termination second switch pipe M2 grids of second capacitance C2.
Wherein, the voltage detection module includes：Third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance
C6, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, the thirteenth resistor electricity of R13, the tenth resistance R14, the 15th
R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 19th resistance R19, the 20th resistance R20 are hindered,
21st resistance R21, the first triode P1, the second triode P2, third transistor P3 and the 4th triode P4；
The first triode P1 base stages, collector, the one end the 18th resistance R18 are connected, first triode
P1 emitters connect the tenth resistance R10, the eleventh resistor R11 and the connecting pins third capacitance C3；
18th resistance R18 another termination the 19th resistance R19, the 20th resistance R20, described second
11 connecting pins resistance R21；
Another termination eleventh resistor R11 of tenth resistance R10, the third capacitance C3 and the two or three pole
Pipe P2 base connections；
Another termination the second triode P2 collectors of 19th resistance R19；
Another termination third transistor P3 collectors of 20th resistance R20；
Another termination the 4th triode P4 collectors of 21st resistance R21；
The second triode P2 emitters connect the twelfth resistor R12, the connecting pins the thirteenth resistor R13；Institute
State another termination one end the 4th capacitance C4 twelfth resistor R12；Another terminations of thirteenth resistor R13 the 4th electricity
Hold the C4 other ends and the third transistor P3 base stages；
The third transistor P3 emitters connect the 14th resistance R14, the connecting pins the 15th resistance R15；Institute
State another termination one end the 5th capacitance C5 the 14th resistance R14；Another terminations of 15th resistance R15 the 5th electricity
Hold the C5 other ends and the 4th triode P4 base stages；
The 4th triode P4 emitters connect the 16th resistance R16, the connecting pins the 17th resistance R17；Institute
State another termination one end the 6th capacitance C6 the 16th resistance R16；Another terminations of 17th resistance R17 the 6th electricity
Hold the C6 other ends.
Wherein, the 18th resistance R18 described in the voltage detection module, the 19th resistance R19, the described 20th
Resistance R20, the 21st resistance R21 are ground connection sampling resistor；By flowing through transistor emitter current-limiting resistance and ground connection
Sampling resistor ratio is 1：1.
Wherein, the control module uses 32 arm processors.
Wherein, the multi-path choice module includes：Multi-path choice chip U1, filter capacitor CW1, filter resistance RW1；
The multi-path choice chip U1 pins X and filter resistance RW1One end is connected；The filter resistance RW1The other end
Connect output；
The filter capacitor CW1One termination output, the ground pin GND of another termination multi-path choice chip U1.
Wherein, the multi-path choice chip U1 is multiple selector HC4051.
Other side according to the present invention, the present invention provides a kind of battery pack internal resistance detection method, this method includes：
Control module sends the electric current Injection Signal of battery pack；
The control module acquires the voltage signal of corresponding battery pack according to the electric current Injection Signal；
The control module obtains each battery in battery pack according to the electric current Injection Signal and the voltage signal
Internal resistance value.
Wherein, the electric current Injection Signal includes：Injection Current size and Injection Current time.
Another aspect according to the present invention, the present invention provides a kind of battery pack internal resistance detection device, which includes：
Signal sending submodule, the electric current Injection Signal for sending battery pack, the electric current Injection Signal include：Injection
Size of current and Injection Current time；
Signal submodule is acquired, for according to the electric current Injection Signal, acquiring the voltage signal of corresponding battery pack；
Acquisition of information submodule, for the control module according to the electric current Injection Signal and the voltage signal,
Obtain the internal resistance value of each battery in battery pack.
The beneficial effects of the invention are as follows：The electric current Injection Signal of battery pack is sent to the Injection Current by control module
Module；According to the electric current Injection Signal that the control module is sent, electric current is input in battery pack to be detected；The voltage inspection
Survey module, be used for the voltage acquisition signal that is sent according to the control module, to the corresponding voltage of the battery pack to be detected into
Row voltage detecting, and testing result is sent to the control module；The control module is adopted according to the electric current Injection Signal
The voltage signal of the corresponding battery pack of collection；The multi-path choice module, it is to be detected for being detected according to control module needs
Battery pack number handles the voltage signal of the battery pack to be detected, and voltage signal is sent to institute by treated
Control module is stated, the control module obtains each in battery pack according to the electric current Injection Signal and the voltage signal
The internal resistance value of battery.Not only using battery pack internal resistance detection circuit provided by the invention and battery pack internal resistance detection method and device
Battery pack internal resistance detection circuit design structure is simplified, design cost is also reduced.
Description of the drawings
Fig. 1 is that the present invention provides a kind of battery pack internal resistance detection electrical block diagram；
Fig. 2 is Injection Current module circuit diagram in a kind of battery pack internal resistance detection circuit provided by the invention；
Fig. 3 is voltage detection module circuit diagram in a kind of battery pack internal resistance detection circuit provided by the invention；
Fig. 4 is multi-path choice module circuit diagram in a kind of battery pack internal resistance detection circuit provided by the invention；
Fig. 5 is control module circuit diagram in a kind of battery pack internal resistance detection circuit provided by the invention；
Fig. 6 is a kind of battery pack internal resistance detection method flow chart provided by the invention；
Fig. 7 is a kind of battery pack internal resistance detection apparatus structure schematic diagram provided by the invention；
Fig. 8 is the drive at the first optocoupler N1, the second optocoupler N2 in a kind of battery pack internal resistance detection circuit provided by the invention
Dynamic oscillogram；
Fig. 9 is the GS oscillograms of first switch pipe M1 in a kind of battery pack internal resistance detection circuit provided by the invention；
Figure 10 is No. 1st internal resistance of cell detection voltage waveform in a kind of battery pack internal resistance detection circuit provided by the invention
Figure.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The present invention provides a kind of battery pack internal resistance detection circuit and battery pack internal resistance detection methods and device.
Fig. 1 is a kind of battery pack internal resistance detection electrical block diagram provided by the invention；The circuit specifically includes:Injection
Current module 101, control module 102, voltage detection module 103 and multi-path choice module 104；
The Injection Current module 101, the electric current Injection Signal for being sent according to the control module 102, by electric current
It is input in battery pack to be detected；
The control module 102, for controlling the Injection Current module 101, the voltage detection module 103 and institute
It states multi-path choice module 103 and carries out cooperating, and finally obtain battery pack internal resistance；
The voltage detection module 103, the voltage acquisition signal for being used for being sent according to the control module 102, to described
The corresponding voltage of battery pack to be detected carries out voltage detecting, and testing result is sent to the control module 102；
The multi-path choice module 104, for needing the battery pack to be detected detected according to the control module 102
Number, the voltage signal of the battery pack to be detected is handled, and voltage signal is sent to the control mould by treated
Block 102.
It is that a kind of battery pack internal resistance detection circuit provided by the invention is each as shown in Figures 2 to 5 based on above example
Module circuit diagram；The circuit includes：Injection Current module 101, control module 102, voltage detection module 103 and multi-path choice mould
Block 104；
The Injection Current module is as shown in Fig. 2, the module includes：First optocoupler N1, the second optocoupler N2, first resistor
R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the first capacitance C1, the second capacitance C2 and first switch pipe M1, second switch pipe M2；
The first resistor R1 mono- terminates the control module pin RBH1, another termination the first optocoupler N1 anodes
End；The first optocoupler N1 cathode terminals ground connection, the first optocoupler N1 emitters terminate the control module pin RB14 and institute
First switch pipe M1 drain electrodes connecting pin is stated, the first optocoupler N1 collectors terminate the one end the 3rd resistor R3, the third
Another termination second switch pipe M2 grids of resistance R3；
The first switch pipe M1 grids connect the second resistance R2, the first connecting pins capacitance C1, the 6th resistance R6；
The first switch pipe M1 drain electrodes meet the control module pin RB14, and the first switch pipe M1 source electrodes connect the 4th resistance
The one end R4；
Another termination control module pin RB14 of the second resistance R2, described in another terminations of the first capacitance C1
Control module pin RB14, the emitter terminal of another termination the second optocoupler N2 of the 6th resistance R6；4th resistance
The R4 other ends meet the 5th resistance R5 and the control module pin RB12 respectively；Described in another terminations of the 5th resistance R5
The M2 drain electrodes of second switch pipe；
The anode of the second optocoupler N2 terminates the one end the 8th resistance R8, the cathode termination of the second optocoupler N2
The collector on ground, the second optocoupler N2 terminates the control module pin RB10；Described in another terminations of the 8th resistance R8
Control module pin RBL1；
The second switch pipe M2 source electrodes meet the control module pin RB10 and the 7th resistance R7 respectively, and described
The connecting pin of two capacitance C2；Another termination second switch pipe M2 grids of 7th resistance R7；The second capacitance C2 is another
The one termination second switch pipe M2 grids.
The voltage detection module is as shown in figure 3, the module includes：Third capacitance C3, the 4th capacitance C4, the 5th capacitance
C5, the 6th capacitance C6, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the tenth resistance
R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance R18, the 19th resistance R19, the
The 20 resistance triode of R20, the 21st resistance R21, first P1, the second triode P2, third transistor P3 and the four or three pole
Pipe P4；
The first triode P1 base stages, collector, the one end the 18th resistance R18 are connected, first triode
P1 emitters connect the tenth resistance R10, the eleventh resistor R11 and the connecting pins third capacitance C3；
18th resistance R18 another termination the 19th resistance R19, the 20th resistance R20, described second
11 connecting pins resistance R21；
Another termination eleventh resistor R11 of tenth resistance R10, the third capacitance C3 and the two or three pole
Pipe P2 base connections；
Another termination the second triode P2 collectors of 19th resistance R19；
Another termination third transistor P3 collectors of 20th resistance R20；
Another termination the 4th triode P4 collectors of 21st resistance R21；
The second triode P2 emitters connect the twelfth resistor R12, the connecting pins the thirteenth resistor R13；Institute
State another termination one end the 4th capacitance C4 twelfth resistor R12；Another terminations of thirteenth resistor R13 the 4th electricity
Hold the C4 other ends and the third transistor P3 base stages；
The third transistor P3 emitters connect the 14th resistance R14, the connecting pins the 15th resistance R15；Institute
State another termination one end the 5th capacitance C5 the 14th resistance R14；Another terminations of 15th resistance R15 the 5th electricity
Hold the C5 other ends and the 4th triode P4 base stages；
The 4th triode P4 emitters connect the 16th resistance R16, the connecting pins the 17th resistance R17；Institute
State another termination one end the 6th capacitance C6 the 16th resistance R16；Another terminations of 17th resistance R17 the 6th electricity
Hold the C6 other ends.
18th resistance R18 described in the voltage detection module, the 19th resistance R19, the 20th resistance
R20, the 21st resistance R21 are ground connection sampling resistor；It is sampled by flowing through transistor emitter current-limiting resistance and ground connection
Resistance ratio is 1：1.
It should be noted that the first optocoupler N1 pins 1 are anode tap, the I/O signals that control module is sent out are received；Institute
It is cathode terminal to state the first optocoupler N1 pins 2, is connected with ground terminal；The first optocoupler N1 pins 3 are emitter terminal；Described first
Optocoupler N1 pins 4 are collector terminal；The first optocoupler N1 pins 3 and pin 4 provide the grid of the second switch pipe M2
Pole driving current.
The second optocoupler N2 pins 1 are anode tap, receive the I/O signals that control module is sent out；The second optocoupler N2
Pin 2 is cathode terminal, is connected with ground terminal；The second optocoupler N2 pins 3 are emitter terminal；The second optocoupler N2 pins 4
For collector terminal；The second optocoupler N2 pins 3 and pin 4 provide the gate drive current of the second switch pipe M1.
The first switch pipe M1 pins 1 are grid, and pin 2 is source electrode, and pin 3 is drain electrode, the first switch pipe M1
The switch of pipe realizes the electric current injection of two batteries of upper half group；The second switch pipe M2 pins 1 are grid, and pin 2 is drain electrode,
Pin 3 is source electrode, and the switch of the second switch pipe M2 pipes realizes the electric current injection of two batteries of lower half group.
As shown in figure 5, being the control module circuit diagram；The module uses 32 arm processors.
As shown in figure 4, being the multi-path choice module circuit diagram；The module includes：Multi-path choice chip U1, filter capacitor
CW1, filter resistance RW1；
The multi-path choice chip U1 pins X and filter resistance RW1One end is connected；The filter resistance RW1The other end
Connect output；
The filter capacitor CW1One termination output, the ground pin GND of another termination multi-path choice chip U1.
Wherein, the multi-path choice chip U1 is multiple selector HC4051.
Based on above example, circuit realization principle of the present invention is described in detail；It is specific as follows：
The present invention detects accumulator internal resistance using DC current injection method.The battery pack accesses the Injection Current module
According to the instruction of the control module, two resistance alternately access battery pack is controlled respectively, achievees the purpose that Injection Current.
When needing to detect battery pack internal resistance, two-way square wave letter is sent out by two I/O pins of arm processor of control module
Number, the two paths of signals frequency is identical, and level on the contrary, realize the Injection Current module to upper half group battery and lower half group respectively
The electric current of battery injects.Pin RBL1 is set high while pin RBH1 when the arm processor to set low, R2 points of resistance R6, resistance
Swaging at the first switch pipe M1 positive-negative-positive metal-oxide-semiconductor gate drive voltage, to make first switch pipe M1 ON operations.The
The conducting of one switching tube M1 makes R4 resistance access circuits, realizes the electric current injection of three, four batteries.When arm processor is by pin
RBL1 is set low while pin RBH1 sets height, and the M1 shutdowns of first switch pipe, resistance R3, R7 divide the NPN to form second switch pipe M2
Type metal-oxide-semiconductor gate drive voltage realizes the electric current injection of one, two batteries to which load resistance R5 is accessed circuit.Capacitance
The effect of C1, C2, which are rubbing driving processes, makes metal-oxide-semiconductor slowly be connected, and reduces the momentary spikes voltage that metal-oxide-semiconductor switch generates.This hair
It is bright to use 500Hz, electric discharge turn-on time for 800 μ s, there are the injection mode of 200 μ s dead times, voltage change is detected, to prevent
Only two resistance discharge simultaneously.Two-way Injection Signal makes resistance R4, R5 alternately access battery pack, often starts an internal resistance detection work(
Can, the time control of Injection Current ensure that the sampled data of 4 batteries, while resistance and metal-oxide-semiconductor fever in 4 period 8ms
It is smaller, it was unlikely to cause thermal damage circuit.
The voltage detection module can complete the detection of cell voltage, and per batteries, detection is relatively independent and uses constant current
Mode obtain sampled signal.Single battery voltage flows through PNP triode emitter and base stage by current-limiting resistance, forms transmitting
Electrode current IE, using triode current characteristics, collector current IC flows through 4 sampling resistors altogether, forms 4 voltage letters
Number, it is sent into A/D mouthfuls of arm processor, carries out voltage detecting.When internal resistance detection, due to completing connecing for discharge resistance with fixed frequency
Enter and disconnect, the voltage change of identical frequency can be formed at battery both ends in this way, and then exist simultaneously same frequency in detection circuit
The AC compounent of rate, due to the presence of C4, C5, C6 capacitance, resistance R12, R14, R16 are accessed in circuit, this battery-end is made to exchange
Component voltage changes according to 1：1 ratio passes to detection output mouth, and then ensure that preferable accuracy of detection.Per batteries
Voltage sample data pass data to arm processor by multiple selector, will sampling after the processing of arm processor software filtering
Data bring algorithmic formula into and calculate the internal resistance of every batteries and the voltage of single battery.
Multi-path choice module includes：Multi-path choice chip U1, filter capacitor CW1, filter resistance RW1；In view of practical application
In need to detect multigroup battery, the multi-path choice chip U1 can select multiple selector HC4051, can effectively reduce ARM
The use that A/D mouthfuls of chip.8 batteries internal resistances can be detected using one piece of HC4051.If you need to detect more multigroup battery, can add
Multiple selector quantity carries out the selection of branch by rationally changing INH, A, B, C pin level.The capacitance CW1, resistance
RW1Single order RC filters are formed, the voltage signal selected is sent to arm processor.
It is 12 that the control module, which uses 32 arm processors, AD sampling precisions, i.e., minimum voltage of differentiating is
0.81mv(3.3V/212).For guarantee internal resistance of cell accuracy of detection, need to consider the size of ohmic load R4, R5 when Injection Current,
To ensure that voltage detection signal variation (i.e. internal resistance of cell both end voltage changes) can detect in arm processor in range.R4, R5 electricity
Resistance value selection is too small to enable load current excessive, and device power demand becomes larger, and cause unnecessary waste, the choosing of R4, R5 resistance value
Conference was taken to make arm processor accuracy of detection that can not ensure.Since internal resistance of cell variation range is generally several milliohms to tens millis
Within the scope of Europe, such as：The present invention uses the access load of two batteries for RJ17-2W-5.1 Ω-J common metal film resistance devices, note
Entering electric current is about：25V/5.1 Ω=4.9A, the lead-acid accumulator internal resistance with common 12V are about that 4m Ω are calculated, then battery terminal voltage
Variation is：4.9*4=19.6mv, 12 AD sampling precisions can ensure testing requirements.
After starting battery pack internal resistance detection circuit, voltage detection module is responsible for detecting the voltage change at battery both ends.This
When the cyclically-varying injected due to electric current of the 1st road internal resistance detection circuit, so that the voltage change at the first batteries both ends is passed through electricity
Hold C3 to be reacted directly on resistance R18, detects two voltage V at this timeBT1 high、VBT1 is low；VBT1 highIndicate first segment when metal-oxide-semiconductor shutdown
The sampled voltage of battery, VBT1 is lowFor low level when, indicate the sampled voltage of metal-oxide-semiconductor first batteries when opening.VBT1 highWith VBT1 is low
Difference be first segment battery discharge, internal resistance generates voltage change, due to known to load resistance R5 resistance values, the both ends R5 terminal voltage
It can be by VBT1 is low、VBT2 is lowIt acquires.Therefore can find out when load R5 accesses two batteries and flow through the electric current of R5, and then become by known voltage
Change difference and acquires internal resistance with electric current.Other each batteries internal resistance Computing Principles are identical as Section 1 battery.
Cell voltage algorithmic formula is：
First segment cell voltage：VB11=VBT1*(R10//R11+R18)/R18+VP
Second economize on electricity cell voltage：VB12=VBT2*R13/R19+VP
Third economize on electricity cell voltage：VB13=VBT3*R15/R20+VP
4th economize on electricity cell voltage：VB14=VBT4*R17/R21+VP
In formula：VBT1、VBT2、VBT3、VBT4For each detection branch output voltage values, VPFor V in PNP triodeEBPressure drop.
Internal resistance of cell algorithmic formula is：
Section 1 internal resistance：r1=R5*(VBT1 high-VBT1 is low)/[VBT1 is low*(R10//R11+R18)/R18+VBT2 is low*R13/R19+2VP-VDS]
Section 2 internal resistance：r2=R5*(VBT2 high-VBT2 is low)/[VBT1 is low*(R10//R11+R18)/R18+VBT2 is low*R13/R19+2VP-VDS]
Section 3 internal resistance：r3=R4*(VBT3 high-VBT3 is low)/[(VBT3 is low+VBT4 is low)*R15/R20+2VP-VDS]
Section 4 internal resistance：r4=R4*(VBT4 high-VBT4 is low)/[(VBT3 is low+VBT4 is low)*R15/R20+2VP-VDS]
Wherein, VDSWhen being injected for battery discharge current, the conduction voltage drop of metal-oxide-semiconductor, the VBT1 highIndicate VBT1For high voltage,
VBT1 is lowIndicate VBT1For low-voltage, and so on.The battery pack internal resistance detection circuit element parameter is as shown in table 1.
Table 1：
Wherein, it is that the drive waveforms that arm processor is sent out are as shown in Figure 8 at described optocoupler N1, N2：Two-way drive signal is mutual
It mends, frequency 500Hz, duty ratio 40%, there are the dead time of 200 μ s, duration 8ms for two drive signals.It waits for
After next internal resistance detection instruction, it is again turned on driving hair wave.
The GS waveforms of metal-oxide-semiconductor M1 are as shown in Figure 9：Drive signal controls metal-oxide-semiconductor switch 4 times, occurs point when to avoid switch
Peak, access capacitance C2 keeps DS waveforms more smooth on metal-oxide-semiconductor GS.Slow down the rate that metal-oxide-semiconductor is opened, reduces on electric current injection line
Parasitic inductance, the influence to sampling precision.
Section 1 internal resistance of cell detection signal waveform, the i.e. both ends R18 waveform are as shown in Figure 10, due to lead inductance
In the presence of that waveform can be made spike occur, low and high level is only chosen when sampling rear 2/3 is being detected as valid data, by the RAM
Processor carries out A/D samplings after being filtered.When calculating, 2ms data voltages variation before sampling, as first segment internal resistance of cell meter
Count evidence.Calculate successively later second and third, four batteries internal resistances.To make waveform show obviously, observed per lattice using 20mv.Show
Biasing -2.4v is arranged in wave device.
It should be noted that the selection of the cell voltage and internal resistance detection circuit current-limiting resistance is suitable, ensure battery
The static leakage current of group should be not more than 10- 5C20A meets communication and is reached with valve controlled sealed lead-acid accumulator YD/T 799-2010
To index request.
It should also be noted that, the selection of the Injection Current size and injection length, had both met A/D accuracy requirements, together
When to be unlikely to device heating amount serious.
It should also be noted that, in the circuit of the voltage detection module, by flowing through transistor emitter current-limiting resistance
With the 1 of ground connection sampling resistor：1 ratio selects, the alternating voltage component variation 1 for allowing battery discharge to generate:1 be delivered in samples electricity
Output end is hindered, sampling precision is improved.
Fig. 6 is that the present invention provides a kind of battery pack internal resistance detection method flow charts；This method specifically includes：
601：Control module sends the electric current Injection Signal of battery pack；
602：The control module acquires the voltage signal of corresponding battery pack according to the electric current Injection Signal；
603：The control module obtains each in battery pack according to the electric current Injection Signal and the voltage signal
The internal resistance value of battery.
Wherein, the electric current Injection Signal includes：Injection Current size and Injection Current time.
Fig. 7 is that the present invention provides a kind of battery pack internal resistance detection apparatus structure schematic diagrams；The device specifically includes：
Signal sending submodule 701, the electric current Injection Signal for sending battery pack, the electric current Injection Signal include：
Injection Current size and Injection Current time；
Signal submodule 702 is acquired, for according to the electric current Injection Signal, acquiring the voltage signal of corresponding battery pack；
Acquisition of information submodule 703 is believed for the control module according to the electric current Injection Signal and the voltage
Number, obtain the internal resistance value of each battery in battery pack.
The beneficial effects of the invention are as follows：The electric current Injection Signal of battery pack is sent to the Injection Current by control module
Module；According to the electric current Injection Signal that the control module is sent, electric current is input in battery pack to be detected；The voltage inspection
Survey module, be used for the voltage acquisition signal that is sent according to the control module, to the corresponding voltage of the battery pack to be detected into
Row voltage detecting, and testing result is sent to the control module；The control module is adopted according to the electric current Injection Signal
The voltage signal of the corresponding battery pack of collection；The multi-path choice module, it is to be detected for being detected according to control module needs
Battery pack number handles the voltage signal of the battery pack to be detected, and voltage signal is sent to institute by treated
Control module is stated, the control module obtains each in battery pack according to the electric current Injection Signal and the voltage signal
The internal resistance value of battery.Not only using battery pack internal resistance detection circuit provided by the invention and battery pack internal resistance detection method and device
Battery pack internal resistance detection circuit design structure is simplified, design cost is also reduced.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (6)
1. a kind of battery pack internal resistance detection circuit, which is characterized in that the circuit includes：Injection Current module, control module, voltage
Detection module and multi-path choice module；
The Injection Current module, the electric current Injection Signal for being sent according to the control module control two resistance alternatings
Battery pack to be detected is accessed, electric current is input in battery pack to be detected；
The voltage detection module, the voltage acquisition signal for being used for being sent according to the control module, to the battery to be detected
The corresponding voltage of group carries out voltage detecting, and testing result is sent to the control module；
The multi-path choice module, the battery pack number to be detected for needing to detect according to the control module, is waited for described
The voltage signal of detection battery pack is handled, and voltage signal is sent to the control module by treated；
The control module, for controlling the Injection Current module, the voltage detection module and the multi-path choice mould
Block carries out cooperating, and finally obtains battery pack internal resistance；
Wherein, the Injection Current module includes：First optocoupler N1, the second optocoupler N2, first resistor R1, second resistance R2,
Three resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the first capacitance C1,
Two capacitance C2, first switch pipe M1 and second switch pipe M2；The first resistor R1 mono- terminates the control module, another termination
The first optocoupler N1 anode taps；The first optocoupler N1 cathode terminals ground connection, the first optocoupler N1 collectors terminate the control
The connecting pin of molding block and the first switch pipe M1, the first optocoupler N1 emitters terminate the one end the 3rd resistor R3,
Another termination second switch pipe M2 grids of 3rd resistor R3；The first switch pipe M1 grids connect the second resistance
The one end R2, first one end capacitance C1 and the one end the 6th resistance R6 connecting pin；The first switch pipe M1 drain electrodes connect described
Control module, the first switch pipe M1 source electrodes connect the one end the 4th resistance R4；Described in another terminations of second resistance R2
Control module, another termination control modules of the first capacitance C1, another termination second light of the 6th resistance R6
The collector terminal of coupling N2；The 4th resistance R4 other ends meet the company of described 5th one end resistance R5 and the control module respectively
Connect end；Another terminations of 5th resistance R5 second switch pipe M2 drain electrodes；Described in the anode termination of the second optocoupler N2
8th one end resistance R8, the cathode terminal ground connection of the second optocoupler N2, the emitter of the second optocoupler N2 terminate the control
Module；Another termination control modules of 8th resistance R8；The second switch pipe M2 source electrodes meet the control module, institute
State the connecting pin of the 7th one end resistance R7 and described one end second capacitance C2；Another termination of the 7th resistance R7 described second is opened
Close pipe M2 grids；Another termination second switch pipe M2 grids of second capacitance C2.
2. battery pack internal resistance detection circuit as described in claim 1, which is characterized in that the voltage detection module includes：The
Three capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the tenth resistance R10, eleventh resistor R11, the 12nd electricity
Hinder R12, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the 17th resistance R17,
18th resistance R18, the 19th resistance R19, the 20th resistance R20, the 21st resistance R21, the first triode P1, the two or three
Pole pipe P2, third transistor P3 and the 4th triode P4；
The connecting pin of the first triode P1 base stages and collector is connected with the one end the 18th resistance R18, and described first
Triode P1 emitters connect the one end the tenth resistance R10, the one end the eleventh resistor R11 and described one end third capacitance C3
Connecting pin；
Another termination one end the 19th resistance R19, described 20th one end resistance R20 and institutes of 18th resistance R18
State the connecting pin of the 21st one end resistance R21；
Another termination of tenth resistance R10 eleventh resistor R11 other ends, the third capacitance C3 other ends and described
The connecting pin of second triode P2 base stages；
Another termination the second triode P2 collectors of 19th resistance R19；
Another termination third transistor P3 collectors of 20th resistance R20；
Another termination the 4th triode P4 collectors of 21st resistance R21；
The second triode P2 emitters meet the company of the one end the twelfth resistor R12 and the one end the thirteenth resistor R13
Connect end；Described another termination one end the 4th capacitance C4 twelfth resistor R12；Another termination institutes of thirteenth resistor R13
State the 4th capacitance C4 other ends and the third transistor P3 base stages；
The third transistor P3 emitters meet the company of described 14th one end resistance R14 and the one end the 15th resistance R15
Connect end；Described another termination one end the 5th capacitance C5 14th resistance R14；Another termination institutes of 15th resistance R15
State the 5th capacitance C5 other ends and the 4th triode P4 base stages；
The 4th triode P4 emitters meet the company of described 16th one end resistance R16 and the one end the 17th resistance R17
Connect end；Described another termination one end the 6th capacitance C6 16th resistance R16；Another termination institutes of 17th resistance R17
State the 6th capacitance C6 other ends.
3. battery pack internal resistance detection circuit as claimed in claim 2, which is characterized in that described in the voltage detection module
18 resistance R18, the 19th resistance R19, the 20th resistance R20 and the 21st resistance R21 are that ground connection is adopted
Sample resistance；It is 1 by flowing through transistor emitter current-limiting resistance and ground connection sampling resistor ratio：1.
4. battery pack internal resistance detection circuit as claimed in claim 3, which is characterized in that the control module uses 32 ARM
Processor.
5. battery pack internal resistance detection circuit as claimed in claim 4, which is characterized in that the multi-path choice module includes：It is more
Road selects chip U1, filter capacitor CW1With filter resistance RW1；
The multi-path choice chip U1 pins X and filter resistance RW1One end is connected；The filter resistance RW1Another termination is defeated
Go out；
The filter capacitor CW1One termination output, the ground pin GND of another termination multi-path choice chip U1.
6. battery pack internal resistance detection circuit as claimed in claim 5, which is characterized in that the multi-path choice chip U1 is multichannel
Selector HC4051.
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| CN201510575049.4A CN105158573B (en) | 2015-09-10 | 2015-09-10 | A kind of battery pack internal resistance detection circuit and battery pack internal resistance detection method and device |
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| CN113805091A (en) * | 2020-05-27 | 2021-12-17 | 比亚迪半导体股份有限公司 | Battery pack monitoring device, management system and vehicle |
| DE102021131645A1 (en) | 2021-12-01 | 2023-06-01 | Audi Aktiengesellschaft | Method for evaluating an electrical connection of an electrical energy store with an on-board network, and electronic battery evaluation system and vehicle |
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Effective date of registration: 20200110 Address after: 071800 1-102, building a, Jingjin talent home (Xincheng community), West District, Xiongxian Economic Development Zone, Baoding City, Hebei Province Patentee after: Xiong'an power source technology Co., Ltd Address before: 100070 No. 8, Spark Road, Fengtai District science and Technology Park, Beijing Patentee before: Beijing Power Producer Science and Technology Co., Ltd. |