CN109031151A - A kind of low cost battery pack string detection device and detection method - Google Patents
A kind of low cost battery pack string detection device and detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 230000003750 conditioning effect Effects 0.000 claims abstract description 21
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 239000000178 monomer Substances 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
- 238000007726 management method Methods 0.000 description 12
- 229910052744 lithium Inorganic materials 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The present invention devises a kind of high performance battery string detection device and detection method, including battery pack, balance module, further includes signal conditioning module, CPU, isolated power supply；The battery pack includes detection line, equilibrium line, anode B+, cathode B-；The signal conditioning module is made of voltage acquisition unit, acquisition balanced unit, compression limiter, the voltage detecting of battery cell is carried out using the on piece analog-digital converter that CPU is carried, when acquisition control switch OFF, CPU stops detection, and detection circuit does not consume the electric energy of battery pack；The CPU included on piece analog-digital converter can be completed at the same time the voltage detecting of all battery cells in battery pack.The apparatus structure is simple compared with other devices, using the analog-digital converter carried in control CPU, does not need to use simulation numeral front-end chip, therefore at low cost, and can detect all monomer battery voltages simultaneously, therefore it is fast to detect speed.
Description
Technical field
The present invention relates to a kind of inexpensive battery pack string detection device and detection methods, belong to the associated batteries such as lithium battery
Management system carries out the battery check device of analog-to-digital conversion especially with CPU.
Background technique
With the development of lithium battery and energy storage technology, the requirement to battery management system is also higher and higher, and in cell tube
The detection device of battery plays an important role in reason system, and the safety of service performance and battery to battery has important
It influences.
What application was most at present is to use core of the integrated chip AFE(analog front end) as battery management system, such as China is specially
Sharp 205985247 U of CN discloses a kind of battery management system using ML5235 AFE(analog front end)；206117193 U of CN is disclosed
A kind of battery management system using control IC；205304339 U of CN discloses a kind of using BQ7694003 AFE(analog front end)
Battery management system.Carrying out battery management and detection using existing integrated chip AFE(analog front end) has many drawbacks: firstly, being
The battery cell limited amount that integrated chip is able to detect and manages, generally 4,6,12 etc..It is unfavorable for practical application in this way.
If communication field application needs 48V battery, if needing 16 battery series connection using ferric phosphate lithium cell, and if lithium titanate battery
22 battery series connection are needed, may require that multiple cascades use using integrated battery chip, since battery series connection number will not be just
It is identical as the number of chip controls, therefore wasting phenomenon can be generated.If multiple chip cascades use, data communication handles ratio
It is more complex.Secondly, integrated chip typically cost is higher, excessively high device cost limits the popularization and use of integrated chip.
204858686 U of Chinese patent CN discloses a kind of battery management system using FPGA using dedicated modulus
Converter increases the cost of system.204886310 U of CN discloses a kind of battery management system using ARM, although sharp
With the analog-digital converter of ARM on piece, but each conditioning circuit uses difference channel and voltage follower, increase system at
This needs high pressure amplifier composition difference channel and voltage especially when battery group series connection monomer is more, voltage is higher than 30V
Follower, therefore cost can increase considerably.
In conclusion the contradiction solved between battery management system high-performance and low cost is very important, need to lead to
Optimization design is crossed the cost of battery management system is effectively reduced.
Summary of the invention
The present invention in view of the defects existing in the prior art, proposes a kind of high performance battery string detection device and detection side
Method.The apparatus structure is simple, using the analog-digital converter carried in control CPU, does not need to use simulation numeral front-end chip, because
This is at low cost, and can detect all monomer battery voltages simultaneously, therefore it is fast to detect speed.
The technical scheme adopted by the invention is as follows:
In order to achieve the above object, a kind of inexpensive battery pack string detection device of the invention, including battery pack, equilibrium model
Block, which is characterized in that further include signal conditioning module, CPU, isolated power supply；The battery pack includes detection line, equilibrium line, just
Pole B+, cathode B-；The signal conditioning module is made of voltage acquisition unit, acquisition balanced unit, compression limiter, utilizes CPU
Included on piece analog-digital converter carries out the voltage detecting of battery cell, and when acquisition control switch OFF, CPU stops detection,
Detection circuit does not consume the electric energy of battery pack；The CPU included on piece analog-digital converter is to all battery lists in battery pack
The voltage detecting of body can be completed at the same time.
The signal conditioning module includes voltage acquisition unit, acquisition balanced unit, compression limiter；The voltage acquisition list
Member, acquisition balanced unit, compression limiter are connected to one signal condition network of composition between battery pack and CPU, by battery
The voltage of battery cell in group is adjusted within the voltage range of on piece analog-digital converter detection of CPU.
It include acquisition diode, the first partial pressure electricity for voltage acquisition unit described in each battery cell in battery pack
Resistance, the second divider resistance, acquisition control switch, the detection line that each battery cell anode is drawn in battery pack respectively with acquisition two
Then the connection of pole pipe anode is drawn after the first divider resistance and the second divider resistance partial pressure with the on piece analog-digital converter of CPU
Foot is connected, and second divider resistance is connected with the ground of CPU, then by the cathode B- phase of acquisition control switch and battery pack
Even；The control terminal of the acquisition control switch is connected with the output delivery outlet pin of CPU；The divider resistance will be to be detected
Cell voltage is adjusted within the reference voltage range of analog-digital converter.
It include balanced diode, equalizing resistance, for acquisition balanced unit described in each battery cell in battery pack
Weigh control switch, and the detection line that each battery cell cathode is drawn in battery pack is connected with balanced diode cathode respectively, then
It is connected in parallel by equalizing resistance, switchs using Balance route and be connected with the positive B+ of battery pack；The Balance route is opened
The control terminal of pass is connected with the input/output port pin of CPU.
The compression limiter by regulator tube group at, the ground that the anode of voltage-stabiliser tube meets CPU is connected, the cathode of voltage-stabiliser tube respectively with
The analog-to-digital conversion pin of CPU is connected.
The isolated power supply is that CPU and signal conditioning module are powered, power positive end and with battery pack electrical isolation.
A kind of described inexpensive battery pack string detection device to the detection method of the monomer battery voltage in battery pack,
It is characterized in that, realizes that steps are as follows:
Step 1: it is issued and is instructed by CPU, acquisition control switch connection is controlled by I/O port, and turn off Balance route switch,
CUP timer internal starts timing simultaneously；
After the step 2:CUP timer internal timing t1 time, analog-digital converter believes the cell voltage of input in control sheet
Number carry out analog-to-digital conversion；
Step 3:CUP timer internal timing after the time, controls acquisition control switch by I/O port and closes to t2 (t2 > t1)
It is disconnected, and Balance route switch is connected, while CUP timer internal restarts timing；
After step 4:CUP timer internal timing to t2 time, Balance route switch OFF is controlled by I/O port；
Step 5:CUP using analog-digital converter convert as a result, calculating battery cell voltage according to the following formula: U
(Bi)=AD (i)-AD (i+1), i=1,2,3...n, and AD (n+1)=0V.
Since above-mentioned technical proposal is used, the present invention has following advantages and effect compared with prior art:
An effect of the invention is, is examined using the voltage that the on piece analog-digital converter that CPU is carried carries out battery cell
It surveys, the cost of battery check device is effectively reduced.
An effect of the invention is, is powered using isolated power supply, can carry out parallel detection to multiple battery cells,
System cost is reduced, detection speed is improved.
An effect of the invention is, when acquisition control switch OFF, CPU stops detection, and detection circuit does not consume
The electric energy of battery pack, the energy content of battery caused by preventing because of detection circuit consume.
An effect of the invention is, so that battery unbalanced phenomena caused by detection is disappeared by acquiring balanced unit
It removes.
Detailed description of the invention
Fig. 1 tradition lithium battery management system schematic diagram；
Inexpensive battery pack string detection device connected mode schematic diagram in Fig. 2 present invention；
Fig. 3 is battery pack wiring diagram in the present invention；
Fig. 4 is inexpensive detection device wiring schematic diagram in the present invention；
Fig. 5 is voltage acquisition unit schematic diagram in the present invention；
Fig. 6 is acquisition balanced unit schematic diagram in the present invention；
Fig. 7 is compression limiter schematic diagram in the present invention；
Fig. 8 is tongue tube controllable switch schematic diagram in the present invention；；
Fig. 9 is optocoupler controllable switch schematic diagram in the present invention；
Figure 10 is inexpensive battery pack string detection device detail drawing in the present invention；
Figure 11 is the control flow in the present invention.
In attached drawing, component representated by each label:
1, battery pack, 2, signal conditioning module, 3, CPU, 4, isolated power supply, 5, balance module, 101, detection line, 102,
Weigh line, 103, anode B+, 104, cathode B-, 201, acquisition diode, the 202, first divider resistance, the 203, second divider resistance,
204, acquisition control switchs, 205, balanced diode, 206, equalizing resistance, 207, Balance route switch, 211, voltage acquisition list
Member, 212, acquisition balanced unit, 213, compression limiter, 221, input terminal, 222, output end, 223, control terminal, 224, ground terminal
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
In traditional lithium battery applications, battery manager mostly uses integrated chip, to improve the integrated level of system, usually
Integrated chip is integrated on one chip by AFE(analog front end) and equalizing circuit, as shown in Figure 1.AFE(analog front end) needs high performance mould
Number converter, differential amplifier circuit etc., testing result are transferred to total digital controller, such as single-chip microcontroller, DSP, FPGA etc..Due to
Many single-chip microcontrollers and DSP are integrated on piece analog-digital converter, therefore system designs and said many wastes on the whole, therefore at
This is high.The present embodiment, the on piece analog-digital converter carried using controllers such as single-chip microcontroller, DSP, using resistor network generation
For high-cost differential amplifier circuit, it is achieved that the battery pack string detection device of low cost.
In the present embodiment, the connected detection line 101 of battery pack 1 is connected with signal conditioning module 2, by signal conditioning module
After 2 partial pressure, battery cell voltage signal is transferred to CPU 3, CPU 3 by input/output port to signal conditioning module 2 into
Row control, consumption when reducing detection to battery capacity.The power supply of entire battery pack string detection device is provided by isolated power supply 4,
So that signal conditioning module 2, the ground of CPU 3 and power supply are isolated with battery pack 1, avoid that short circuit occurs and reduce detector gap
The electric energy loss that time generates.Another leading-out terminal equilibrium line 102 of battery pack 1 is connected with balance module 5, to have detected
Equilibrium treatment is carried out to battery pack 1 at rear, is detailed in Fig. 2, Fig. 3.
Battery pack 1 is by B1, B2, B1, B2, B3 ... Bn, n battery cell is composed in series altogether, positive B+103, cathode B-
104, see Fig. 3.On the positive and negative anodes tab of concatenated B1, B2, B3 ... Bn battery cell single-point draw respectively two groups of line A0, A1,
A2 ... An and C0, C1, C2 ... Cn.Wherein, C0, C1, C2 ... Cn are connected as detection line 101 with signal conditioning module 2.C(i-
1) it is connected with battery B (i) (i ∈ [1,2,3,4 ... n]) positive pole ear, C (n) is connected with cathode B-104.
There is battery voltage signal line AD1, AD2, AD3 ... ADn between signal conditioning module 2 and CPU 3, meets CUP 3 respectively
On piece analog-digital converter interface.The two-way input/output port IOa and IOb of CUP 3 is connected with signal conditioning module 2, respectively
Voltage acquisition unit 211 and acquisition balanced unit 212 are controlled, see Fig. 4.
Signal conditioning module 2 is a relative complex network, but three parts can be roughly divided into according to its function:
Voltage acquisition unit 211, acquisition balanced unit 212, compression limiter 213.
Wherein, voltage acquisition unit 211 is as shown in Figure 5.Each battery cell pond B (i) (i ∈ [1,2,3,4 ... n]) is just
The C (i-1) (i ∈ [1,2,3,4 ... n]) that pole is connected connects the anode of an acquisition diode 201, it is, C (i-1)
Connect the anode of D1 (i).The cathode of acquisition diode 201 is connected with the first divider resistance 202, that is, the cathode of D1 (i)
It is connect with R1 (i).The other end and R2 (i) of R1 (i), i.e. the second divider resistance 203 are connected, while exporting to the mould of CPU 3
Number conversion module AD (i).R2 (i), the i.e. other end of the second divider resistance 203 are connected with the ground (GND) of CPU 3.All
The ground terminal of second divider resistance 203 is eventually by the cathode B-104 of acquisition control switch 204 and battery pack 1, the i.e. end Cn phase
Even.The control terminal 223 of acquisition control switch 204 is connected with the input/output interface IOa of CPU 3, and CPU 3 is controlled by IOa
Acquisition control switch 204 processed switches on and off.When needing to acquire cell voltage, CPU 3 controls acquisition control by IOa and opens
204 are closed to connect, battery voltage signal inputs to the analog-to-digital conversion module AD (i) of CPU 3, CPU 3 can simultaneously to n voltage into
Row detection, testing result pass through a series of operations, the voltage of available n battery cell.Due to using CPU3 on piece
Analog-digital converter, without the analog front-end chip in conventional batteries detection circuit, therefore cost substantially reduces.Furthermore CPU3
It can control all analog-digital converters while carrying out analog-to-digital conversion, detection speed can be improved.
The cell voltage that every group of first divider resistance of R1 (i) 202 and the second divider resistance of R2 (i) 203 are connected not phase
Together, it is therefore desirable to the resistance value for adjusting the first divider resistance of R1 (i) 202 and the second divider resistance of R2 (i) 203, after making partial pressure
The maximum value Vmax that voltage signal AD (i) is likely to occur, less than the reference voltage of analog-digital converter, this usual voltage is isolation
Power supply 4 is supplied to the supply voltage of CPU 3.
Since the resistance value of every group of first divider resistance of R1 (i) 202 and the second divider resistance of R2 (i) 203 is all different, because
This connects the electric current I (i) that the battery cell B (i) when carrying out voltage acquisition is exported in acquisition control switch 204 and is all different.
Assuming that 204 turn-on time of acquisition control switch be t2 then all batteries because of electricity Q (i) consumed by voltage detecting=I (i) * t2
It is all different.Although each time is very short, only several ms, electric current is also very small to only have several mA, as battery makes
Increased with the time, detection number increases, and battery capacity can be made to generate inconsistent phenomenon.Hold in order to compensate for because of battery caused by detecting
The difference of amount, i.e. battery unbalanced phenomena, the present invention joined acquisition balanced unit 212 in practical applications, see Fig. 6.
Acquiring balanced unit 212 includes balanced diode 205, equalizing resistance 206, Balance route switch 207.Battery pack 1
In the anode of C (i) detection line 101 drawn of each battery cell B (i) cathode diode 205 balanced with D2 (i) respectively connect,
Then it is connected in parallel by R3 (i) equalizing resistance 206, using the positive B+103 of Balance route switch 207 and battery pack 1
It is connected.The control terminal 223 of the Balance route switch 207 is connected with the delivery outlet pin IOb that enters of CPU 3.R3 (i) equalizing resistance
The selection of 206 resistance value is the resistance value according to R1 (i) the first divider resistance 202 and the second divider resistance of R2 (i) 203.Work as CPU
When 3 control Balance route switches 207 connect the t2 time, the electric current of each battery cell B (i) consumption is made to can compensate for drawing because of detection
The difference of the battery capacity risen.That is, making acquisition control by selecting R3 (i) equalizing resistance 206 to reach suitable resistance value
Output electric current small battery cell when switch 204 is connected becomes in the output electric current that Balance route switch 207 is connected in same time
Greatly；Conversely, output electric current big battery cell when acquisition control switch 204 is connected, when Balance route switch 207 connects identical
Interior output electric current becomes smaller；To make the capacity of all batteries in entire battery pack 1 reach balance.
In order to reduce the loss of detection circuit, in the period without detection, acquisition control can be controlled by CPU3
Switch 204 and Balance route switch 207 simultaneously turn off, due to there is no any circuit between battery pack 1 and signal conditioning module 2,
Therefore the electric energy of any battery storage will not be consumed.
Fig. 7 is 213 schematic diagram of compression limiter, and wherein each output signal of voltage acquisition unit 211 has a pressure stabilizing
Pipe 208.The ground that the anode of voltage-stabiliser tube 208 meets CPU 3 is connected, the cathode of voltage-stabiliser tube 208 respectively with the analog-to-digital conversion pin of CPU 3
It is connected.
Whether acquisition control switch 204 or Balance route switch 207 require electrical isolation.The mode of being generally insulated has
Two kinds of forms:
One is electromagnetic isolation modes, such as relay, tongue tube.It is illustrated in figure 8 tongue tube controllable switch schematic diagram,
Tongue tube controllable switch includes input terminal 221, output end 222, control terminal 223, ground terminal 224.Input terminal 221, output end 222
It is two mechanical contacts, what control terminal 223, ground terminal 224 connected is coil windings.When control terminal 223 and ground terminal 224 are powered
When generating electric current, two mechanical contacts between control signal 221 and output end 222 are attracted and are connected.When 223 He of control terminal
When 224 current vanishes of ground terminal, two mechanical contacts between control signal 221 and output end 222 are discharged and are turned off.
Another electrical isolation mode is optical isolation, optocoupler and light coupling relay etc..Optocoupler is illustrated in figure 9 controllably to open
Close schematic diagram, including input terminal 221, output end 222, control terminal 223, ground terminal 224.Between input terminal 221, output end 222
It is two MOSFET as electronic switch, what control terminal 223, ground terminal 224 connected is light emitting diode.When control terminal 223 is applied
When making alive makes diode current flow shine, two MOSFET between control signal 221 and output end 222 are connected.Work as control
Two MOSFET shutdown when holding 223 loss of voltage, between control signal 221 and output end 222.
In conclusion inexpensive battery check device detail drawing is shown in Figure 10 in the embodiment of the present invention.To the list in battery pack 1
Realize that steps are as follows as shown in figure 11 in 5 parts of the detection method of body cell voltage point:
Step 1: being issued and instructed by CPU 3, acquisition control switch 204 is controlled by I/O port and is connected, and turns off Balance route
Switch 207, while 3 timer internal of CUP starts timing；
After the 3 timer internal timing t1 time of step 2:CUP, cell voltage of the analog-digital converter to input in control sheet
Signal carries out analog-to-digital conversion；
3 timer internal timing of step 3:CUP after the time, controls acquisition control switch by I/O port to t2 (t2 > t1)
204 shutdowns, and Balance route switch 207 is connected, while 3 timer internal of CUP restarts timing；
After 3 timer internal timing to t2 time of step 4:CUP, Balance route switch 207 is controlled by I/O port and is turned off；
Step 5:CUP 3 using analog-digital converter convert as a result, calculating battery cell voltage according to the following formula:
U (Bi)=AD (i)-AD (i+1), i=1,2,3...n, and AD (n+1)=0V.
The foregoing description of the disclosed embodiments, being only used for professional and technical personnel in the field can be realized or use this hair
It is bright.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present invention, therefore sheet
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and innovative point phase
Consistent widest scope.
Claims (7)
1. a kind of low cost battery pack string detection device, including battery pack (1), balance module (5), which is characterized in that further include
Signal conditioning module (2), CPU (3), isolated power supply (4)；The battery pack (1) include detection line (101), equilibrium line (102),
Positive B+ (103), cathode B- (104)；The signal conditioning module (2) is by voltage acquisition unit (211), acquisition balanced unit
(212), compression limiter (213) forms, and the voltage detecting of battery cell is carried out using the on piece analog-digital converter that CPU (3) carry,
When acquisition control switch (204) shutdown, CPU (3) stops detection, and detection circuit does not consume the electric energy of battery pack (1)；It is described
CPU (3) included on piece analog-digital converter can be completed at the same time the voltage detecting of all battery cells in battery pack (1).
2. a kind of inexpensive battery pack string detection device as described in claim 1, which is characterized in that the signal conditioning module
It (2) include voltage acquisition unit (211), acquisition balanced unit (212), compression limiter (213)；The voltage acquisition unit
(211), balanced unit (212) are acquired, compression limiter (213) is connected between battery pack (1) and CPU (3) and forms one
The voltage of battery cell in battery pack (1) is adjusted to the on piece analog-digital converter detection of CPU (3) by signal condition network
Within voltage range.
3. a kind of inexpensive battery pack string detection device as claimed in claim 2, which is characterized in that in battery pack (1)
Each battery cell described in voltage acquisition unit (211) include acquisition diode (201), the first divider resistance (202), second
Divider resistance (203), acquisition control switch (204), the detection line that each battery cell anode is drawn in battery pack (1) respectively with
Acquire the connection of diode (201) anode, after then being divided by the first divider resistance (202) and the second divider resistance (203) and
The on piece analog-digital converter pin of CPU (3) is connected, and second divider resistance (203) is connected with the ground of CPU (3), then passes through
Acquisition control switch (204) is crossed to be connected with the cathode B- (104) of battery pack (1)；The control terminal of the acquisition control switch (204)
(223) it is connected with the output delivery outlet pin of CPU (3)；Cell voltage to be detected is adjusted to modulus by the divider resistance
Within the reference voltage range of converter.
4. a kind of inexpensive battery pack string detection device as claimed in claim 2, which is characterized in that in battery pack (1)
Each battery cell described in acquisition balanced unit (212) include balanced diode (205), equalizing resistance (206), Balance route
Switch (207), the detection line (101) that each battery cell cathode is drawn in battery pack (1) respectively with balanced diode (205) just
Pole connection, is then connected in parallel by equalizing resistance (206), just using Balance route switch (207) and battery pack (1)
Pole B+ (103) is connected；The control terminal (223) of the Balance route switch (207) is connected with the input/output port pin of CPU (3).
5. a kind of inexpensive battery pack string detection device as claimed in claim 2, which is characterized in that the compression limiter
(213) it is made of voltage-stabiliser tube (208), the ground that the anode of voltage-stabiliser tube (208) meets CPU (3) is connected, the cathode point of voltage-stabiliser tube (208)
It is not connected with the analog-to-digital conversion pin of CPU (3).
6. a kind of inexpensive battery pack string detection device as described in claim 1, which is characterized in that the isolated power supply (4)
Power for CPU (3) and signal conditioning module (2), power positive end and with battery pack (1) electrical isolation.
7. based on a kind of low cost battery pack string detection device described in any one of claim 1-5 in battery pack (1)
Monomer battery voltage detection method, which is characterized in that realize steps are as follows:
Step 1: being issued and instructed by CPU (3), acquisition control switch (204) is controlled by I/O port and is connected, and turns off Balance route and opens
It closes (207), while CUP (3) timer internal starts timing；
After step 2:CUP (3) timer internal timing t1 time, battery voltage signal of the analog-digital converter to input in control sheet
Carry out analog-to-digital conversion；
Step 3:CUP (3) timer internal timing after the time, controls acquisition control switch (204) by I/O port to t2 (t2 > t1)
Shutdown, and Balance route switch (207) is connected, while CUP (3) timer internal restarts timing；
After step 4:CUP (3) timer internal timing to t2 time, Balance route switch (207) shutdown is controlled by I/O port；
Step 5:CUP (3) using analog-digital converter convert as a result, calculating battery cell voltage according to the following formula:
U (Bi)=AD (i)-AD (i+1), i=1,2,3...n, and AD (n+1)=0V.
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| CN112440816A (en) * | 2019-08-31 | 2021-03-05 | 比亚迪股份有限公司 | Battery management system and electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112440816A (en) * | 2019-08-31 | 2021-03-05 | 比亚迪股份有限公司 | Battery management system and electric automobile |
| CN112440816B (en) * | 2019-08-31 | 2022-07-15 | 比亚迪股份有限公司 | Battery management system and electric automobile |
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Application publication date: 20181218 |