CN102593917A - Voltage balancing method of high-precision lithium battery module - Google Patents
Voltage balancing method of high-precision lithium battery module Download PDFInfo
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- CN102593917A CN102593917A CN2012100626016A CN201210062601A CN102593917A CN 102593917 A CN102593917 A CN 102593917A CN 2012100626016 A CN2012100626016 A CN 2012100626016A CN 201210062601 A CN201210062601 A CN 201210062601A CN 102593917 A CN102593917 A CN 102593917A
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Abstract
The invention discloses a voltage balancing method of a high-precision lithium battery module. The purpose of accurately controlling balance among lithium batteries 4 is realized by the following steps of: measuring voltages of all the lithium batteries under two different currents, and calculating corresponding serial-connected resistances through a formula Ri=(Vi1-Vi2)/(l1-l2); and correcting measured voltage values of the lithium batteries by using the serial-connected resistances in a balancing process to eliminate the influence of the serial-connected resistances 3 on the voltage measurement of the lithium batteries 4. The voltage balancing method disclosed by the invention has the advantages as follows: the voltage balancing method is simple and practical, can be applied to a process for balancing the charging voltages of the lithium batteries, and further can be applied to a process for balancing the active voltage balance discharging, so that the voltage balance of the charging and discharging processes can be realized. Furthermore, the measured serial-connected resistance in the lithium battery module is one of important index parameters for monitoring variation of the battery module.
Description
Technical field
The present invention relates to a kind of technology that discharges and recharges of lithium battery module, specifically is a kind of high accuracy lithium battery module electric voltage equalization method.
Background technology
Lithium battery safe charging problem is one of main challenge of field of lithium battery application, because the characteristic of lithium battery determines that it can not be overcharged, will produce potential safety hazard when the battery voltage surpasses certain upper limit, and undercharge can reduce the actual capacity of battery again.People usually need be the multisection lithium battery use that is together in series, to improve the battery modules operating voltage in the practical application.When the lithium battery module is charged, can monitor each lithium battery voltage through power-supply management system (BMS), reach when completely filling condition when detecting any one lithium battery voltage, the BMS system can cut off charging current immediately.In charging process, can reach full charging voltage state in order to ensure whole lithium batteries in the battery modules simultaneously, need in charging process, compress into capable equilibrium treatment, the charged state between the lithium battery is consistent lithium battery in the battery modules.The method of the equilibrium that present most of lithium battery module adopts is the voltage between each lithium battery that the BMS systematic survey arrives in the comparison battery modules; When the voltage difference between the lithium battery surpasses a predetermined value; The BMS system can send instruction; The higher lithium battery of instructed voltage discharges (passive type balanced) through bypass resistance with the form of heat with unnecessary electric weight; The electric weight of perhaps that voltage is higher lithium battery is transferred to (initiatively balanced) in the lithium battery that other voltage ratio is lower in the battery modules.Active equilibrium not only can be implemented in charging process, can in discharge process, implement the electric voltage equalization action equally.In discharge process, can keep the voltage between each lithium battery consistent through the method for the transfer of the electric weight between the lithium battery equally.This mop-up equalization technology might become the mainstream technology that following lithium battery module develops.In above-mentioned lithium battery voltage balancing technique, the voltage that whether can accurately measure each lithium battery in the lithium battery module is very crucial.
In the at present actual BMS system that uses, the method for most of N+1 of employing is measured lithium battery voltage, and so-called N+1 method is exactly N lithium battery when being serially connected, and connection N+1 root slotted line just can be measured the voltage of whole lithium batteries.Fig. 1 is connected in series the lithium battery module of composition for N lithium battery, and adopts the voltage measurement method of N+1 to carry out the connection of voltage measurement signal line, and N battery uses N+1 root signal measurement line altogether.Each lithium battery that measures is in this way pressed and is actually lithium battery voltage E and the Overlay that drops to the voltage IR on the series resistance R, and wherein I is the electric current of lithium battery module of flowing through.When the Capacity Ratio of lithium battery module was less, the connection between the battery was also fairly simple, and series resistance R is also therefore smaller, and charging current is not high yet, and series resistance pressure drop IR can ignore.But along with the applied more and more of lithium battery module at dynamical system and energy-storage system; The capacity of battery modules is also improving constantly; Connection resistance between the battery is also changing; Charging and discharging currents is also in quick increase, and therefore in lithium battery module electric voltage equalization process, the influence that series resistance is measured lithium battery voltage must take in.In " clock test-and-control type balanced charging method for lithium battery pack " patent of invention (patent No. CN 10188799A); When proposition is measured lithium battery voltage at every turn in to the electric voltage equalization process of charging, eliminate the influence of series resistance with the method for breaking off charging current (I=0).Above-mentioned this voltage measurement method; Though can eliminate the influence of series resistance, because when each the measurement, all need and to reduce to 0 through the electric current of lithium battery to voltage measurement; Therefore can't implement at discharge process, can't be applied on the omnidistance active balancing technique; And in the bigger lithium battery module of Capacity Ratio was used, charging current was bigger, and is if each measurement all need be cut off charging current, also relatively more difficult in practical implementation.Therefore it is most important to the electric voltage equalization of implementing lithium battery to invent a kind of new lithium battery voltage method of measurement that can eliminate the series resistance influence.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, a kind of high accuracy lithium battery module electric voltage equalization method is provided, eliminate the influence that series resistance is judged equalizing voltage in the lithium battery module loop.
According to technical scheme provided by the invention, said high accuracy lithium battery module electric voltage equalization method is following: be I at the input constant current at first
1The time measure the voltage V of each lithium battery in the series loop
I1, i=1～N changes into I with the constant current of input then
2, measure the voltage V that electric current changes each lithium battery of back with same method
I2, the voltage V of i the lithium battery that measures
I1And V
I2Be actually i lithium battery voltage E
I1And E
I2With series resistance R
iThe Overlay of last pressure drop, promptly
V
i1＝E
i1+I
1R
i，V
i2＝E
i2+I
2R
i (1)
Twice measured voltage difference is:
V
i1-V
i2＝E
i1-E
i2+(I
1-I
2)R
i (2)
The time interval of above-mentioned twice measurement is short to be similar to thinks that the voltage of battery does not change between twice measurement, i.e. E
I1=E
I2, formula (2) is reduced to so
V
i1-V
i2＝(I
1-I
2)R
i (3)
Obtain series resistance R by (3) formula
i:
R
i＝(V
i1-V
i2)/(I
1-I
2) (4)
Utilize said method to obtain the relevant series resistance of whole N lithium battery;
Series resistance is returned to I with electric current after measuring and accomplishing
1, continue normal charging process;
In follow-up lithium battery voltage balancing procedure, utilize the series resistance R that measures
iVoltage to i lithium battery is calibrated, and calibration equation is in charging process:
E
i＝V
i-IR
i； (5)
Calibration equation is in discharge process:
E
i＝V
i+IR
i。(6)
Wherein measuring the flow process of series resistance can implement in the stage of charge or discharge, even can when battery modules is out-of-work, carry out, as long as can in the series loop of lithium battery module, import described two kinds of different constant current I
1And I
2, and the voltage of whole lithium batteries measured get final product.
The series impedance that in the calibration process that lithium battery voltage is measured, uses can all carry out 1 time in each charge and discharge cycles process or repeatedly measurement, and also repeatedly charge and discharge cycles is just measured later on.
Advantage of the present invention is: the present invention is except simple and practical characteristics, and it not only can be applied to lithium cell charging electric voltage equalization process, also can be applied in the balanced equalization discharge process of active voltage, realizes discharging and recharging the electric voltage equalization of overall process.In addition, series resistance itself also is the important indicator parameter that the monitoring battery module performance changes in the lithium battery module that measures.
Description of drawings
Fig. 1: lithium battery module and tension measuring circuit sketch map in the prior art.
Fig. 2: series resistance is measured flow chart in the lithium battery module of the present invention.
Fig. 3: the current curve that series resistance is measured in the lithium battery module.
Fig. 4 (a): conventional lithium battery module charging current and voltage curve.
Fig. 4 (b): lithium cell charging electric current and voltage curve in the lithium battery module of band series resistance calibration function of the present invention.
Fig. 5: lithium battery management system (BMS) structural representation.
Fig. 6: intelligent charge system configuration sketch map.
Fig. 7: lithium battery module charging system structural representation.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
We are as long as under two kinds of different lithium battery module electric currents of flowing through; Measure the voltage of each lithium battery; Through the voltage difference of each lithium battery under high low current, just can calculate the series resistance size that influences the battery voltage measurement value in the lithium battery module loop.Utilize this series resistance, can calculate the influence that series resistance is measured lithium battery voltage under any electric current,, eliminate the influence that series resistance is measured lithium battery voltage, correctly judge the lithium battery equalizing voltage then through Calibration Method.
Fig. 1 is lithium battery module 1 sketch map, and current circuit except N lithium battery 4 of serial connection, also exists by connecting the series resistance 3 that lead causes in current circuit from cathode output end mouth 2 to cathode output end mouth 7.External tension measuring circuit is measured lithium battery 4 voltages through voltage measurement signal line output terminal 5 and voltage signal acquisition line 6.
Fig. 2 is for measuring the operating process of series resistance 3 among the present invention, Fig. 3 is the current corresponding curve.As long as in the current circuit of battery modules, import constant current I earlier
1, in electric current I
1Measure the voltage V of each lithium battery 4 down
I1(i=1 to N); Then constant current is changed into I
2, in electric current I
2Measure the voltage V of each lithium battery 4 down
I2(i=1 to N).Through the above-mentioned parameter that measures; Just can calculate the whole series resistances 3 that influence lithium battery 4 voltage measurements in lithium battery module 1 current circuit; And utilize this series resistance 3; Can in follow-up electric voltage equalization process, compress into the row calibration, eliminate the influence of 3 pairs of lithium battery 4 voltage measurements of series resistance the lithium battery that measures.
The flow process of measurement series resistance 3 shown in Figure 2 can be implemented in the stage of charge or discharge; Even can when battery modules is out-of-work, carry out; As long as can in the series loop of lithium battery module, import two kinds of different constant currents as shown in Figure 3, and whole lithium battery 4 voltages are measured get final product.
Below we just are measured as example to carry out series resistance 3 in the conventional lithium battery constant current charge stage, introduce theoretical foundation of the present invention.
Fig. 4 (b) measures the voltage and the change in current curve of single lithium battery in the lithium battery module 1 of calibration function for band series resistance 3 among the present invention.
Generally we can be chosen in the lithium battery module and carry out constant current charge after a period of time, and lithium battery voltage carries out series resistance and measures in the zone relatively slowly with the variation in charging interval.When carrying out the series resistance measurement, at first can be at battery constant charge current I
1Measure the voltage V of whole N lithium batteries in the battery modules down
I1(i=1 to N) changes into I with constant charge current then
2, measure electric current with same method and change all voltage V of N lithium battery of back
I2(i=1 to N).Can find the voltage V of the battery i that measure this moment by Fig. 1
I1And V
I2Be actually i lithium battery voltage E
I1And E
I2With series resistance R
iThe Overlay of last pressure drop.
V
i1＝E
i1+I
1R
i，V
i2＝E
i2+I
2R
i (1)
Twice measured voltage difference is:
V
i1-V
i2＝E
i1-E
i2+(I
1-I
2)R
i (2)
Because the time interval of above-mentioned twice measurement is very short, is generally between the hundreds of millisecond of a few tens of milliseconds, can be similar to and thinks that the voltage of lithium battery 4 does not change between twice measurement, be i.e. E
I1=E
I2, formula (2) can be reduced to so:
V
i1-V
i2＝(I
1-I
2)R
i (3)
Can obtain series resistance R by (3) formula
i:
R
i＝(V
i1-V
i2)/(I
1-I
2) (4)
Utilize said method can obtain the relevant series resistance of whole N lithium battery.
In follow-up lithium battery voltage balancing procedure, just can utilize the series resistance R that measures
iVoltage to i lithium battery 4 is calibrated, and calibration equation is in charging process:
E
i＝V
i-IR
i (5)
Calibration equation is in discharge process:
E
i＝V
i+IR
i (6)
In practical application, lithium battery itself also has certain internal resistance, our actual measurement to series resistance should be whole series resistances of measuring in the current circuit between two holding wires of this lithium battery voltage, comprising the lithium battery internal resistance.
The series impedance that uses in the calibration process that above-mentioned lithium battery voltage is measured can all carry out 1 time in each charge and discharge cycles process or repeatedly measurement, and also repeatedly charge and discharge cycles is just measured later on.That is to say that the measuring frequency of series resistance can be selected as required, is not that each charge and discharge cycles all must be calibrated, and it is fixed to require according to reality.
Practical implementation method of the present invention is to flow down the voltage of measuring whole lithium batteries 4 two kinds of different electric; And calculate corresponding series resistance 3 through formula (4); In balancing procedure, can utilize the 3 pairs of lithium battery that measures 4 magnitudes of voltage of these series resistances to revise; Eliminate the influence of 3 pairs of lithium battery 4 voltage measurements of series resistance, reach the purpose of electric voltage equalization between the accurate control lithium battery 4.Be practical implementation a kind of scheme of the present invention below, this scheme is carried out the series resistance measurement in charging process, and in the electric voltage equalization process, lithium battery is compressed into the row calibration.
This programme embodiment comprises 3 major parts: lithium battery module, lithium battery management system (BMS) and intelligent charge system.
Fig. 5 is lithium battery management system (BMS) 8 sketch mapes.BMS system 8 is connected with charger through charger anode interface 11 and negative pole interface 12 during charging.The current measurement circuit 19 of BMS system 8 is measured charging currents through current sense resistor 20, and is that digital signal transfers to microprocessor 16 later on the analog signal conversion that measures.Microprocessor can judge whether electric current is normal according to predefined standard, if find current anomaly, microprocessor can turn-off charge and discharge protecting switch 13 by pilot cell protection control circuit 14, cuts off charging current, protection lithium battery 4 safety.The signal input part 17 of BMS system 8 also can be connected with the voltage signal acquisition line 6 of lithium battery 4 in the lithium battery module 1, measures the voltage of whole lithium batteries 4 through its tension measuring circuit 18, and converts digital signal into and send microprocessor 16 later on to.Microprocessor 16 is the voltage difference between the lithium battery 4 relatively all; If voltage difference surpasses a predefined value; Microprocessor 16 will indicate balancing control circuit 15 to start equalizing circuit 18; Lithium battery module 1 is carried out electric voltage equalization, guarantee sustaining voltage equilibrium between each lithium battery 4 in the battery modules.BMS systematic microprocessor 16 can also send the instruction of instructing or accepting external equipment through communication interface 21 to external equipment in addition.
Fig. 6 is the intelligent charge system schematic, and the external communication electricity is inserted by AC power supplies input 23, converts alternating current into direct current through rectification and transforming circuit 24, and adjusting and switching circuit 25 can quantitatively be regulated galvanic voltage swing.In the constant current charge stage, adjusting and switching circuit 25 are delivered to constant-current source 26 with adjusted direct current, and constant-current source can be transported to conversion and testing circuit 30 with direct current with the mode of constant current, exports via the output 27 of charger at last.In the constant voltage charge stage, adjusting and switching circuit 25 are delivered directly to conversion and testing circuit 30 with adjusted direct current, via output 27 outputs of charger.Testing circuit 30 can be measured the voltage and the electric current of out-put supply; And be that digital signal is sent to later in the microprocessor 31 of charging system with analog signal conversion, microprocessor 31 can be through regulating and switching circuit adjusted the voltage or the size of current in output DC source.In addition, charger microprocessor 31 can send or accept instruction to external equipment through communication interface 32.
Fig. 7 is lithium battery module 1 a charging system sketch map.External ac power source 33 inputs to the AC power supplies input of intelligent charge system 22; Charging system 22 converts alternating current to needed DC power supply, transfers to the anode interface 11 and negative pole interface 12 of BMS system 8 connection chargers via the output 27 of charging system 22.The anode interface 9 of BMS system through connecting battery modules and negative pole interface 10 DC power supply that will charge is sent to lithium battery module 1, and lithium battery 4 is charged.BMS system 8 can be through current measurement circuit 19 monitoring charging currents in the charging process; The voltage of each lithium battery 4 in total voltage through tension measuring circuit 18 monitoring charge power supplies and the lithium battery module 1; And can overcurrent occur or cut off charge power supplies through charge and discharge protecting switch 13 superpotential the time, the lithium battery 4 in the protection lithium battery module 1.
The charging process major part of lithium battery all adopts aforesaid constant current-constant voltage mode.In charging process, can reach fully charged state in order to ensure whole lithium batteries 4 in the lithium battery module 1 simultaneously, generally need in charging process, carry out electric voltage equalization to lithium battery in the battery modules 14 and handle, the charged state between the lithium battery 4 is consistent.In most BMS system, can set a balanced starting resistor V
Balanced, the maximum voltage V that this voltage allows less than lithium battery module 1
MaxWhen the total voltage of lithium battery module 1 reaches V
BalancedThe time, the microprocessor 16 in the BMS system 8 will begin whole lithium batteries 4 voltages of relatively measuring through tension measuring circuit 18, and calculates the maximum of lithium battery 4 voltages and the difference Δ V between the minimum value
The electricity coreIf, Δ V
The electricity coreSurpass a preset value Δ V
OpenThe time; BMS system 8 will indicate balancing control circuit 15; Open equalizing circuit 18; Make the higher lithium battery 4 of voltage that unnecessary electric weight is discharged (passive type is balanced) through bypass resistance with the form of heat, perhaps transfer to (initiatively balanced) in the lithium battery 4 that other voltage ratio is lower in the lithium battery module 1.
In above-mentioned balancing procedure, each lithium battery 4 voltages of correct measurement are most important.But can find by Fig. 1, actual measurement to the voltage of i lithium battery 4 are voltage E of lithium battery 4 itself
iWith voltage drop IR on the series resistance 3
iStack result.At series resistance 3 (R
i) with charging current I bigger the time, the influence of series resistance 3 is particularly outstanding.
In order to eliminate series resistance 3 (R
i) influence that equalizing voltage is measured, we can be in constant current charge and total voltage less than balanced starting resistor V
BalancedThe time, utilize flow process among Fig. 2 to measure the corresponding series resistance 3 (R of each lithium battery 4
i), when measuring equalizing voltage, utilize formula (5) that the influence of series resistance 3 is calibrated then.At first, can in BMS system 8, preset a calibration starting resistor V
Calibration, this voltage is less than balanced starting resistor V
BalancedIn the constant current charge process, 8 microprocessors, 16 detected lithium battery module 1 total voltages reach V when the BMS system
CalibrationThe time, BMS system 8 microprocessors 16 will write down the charging current (I that this moment current measurement circuit 19 measures
1) whole lithium batteries 4 voltage V of measuring with voltage detecting circuit 18
I1(i=1 to N).After data record finished, BMS system 8 microprocessors 16 can send through PORT COM 21 and instruct to the microprocessor 31 of intelligent charge system 22, and the constant current that charging system is exported is adjusted to I
2After the adjustment of charging system 22 electric currents finished, BMS system 8 can write down the charging current (I that measures through current measurement circuit 19
2), with the whole lithium batteries that measure through tension measuring circuit 18 4 voltage V
I2(i=1 to N).Microprocessor 16 in the BMS system 8 can be according to the above-mentioned parameter I that measures
1, I
2, V
I1With V
I2, utilize formula (4) to calculate whole N lithium battery 4 pairing series resistance 3R
i(i=1 to N), and should organize storage in microprocessing systems 16.After series resistance 3 was measured and finished, BMS system 8 microprocessors 16 can send and instruct to charging system 22 microprocessors 31, and the constant charge current of charging system is regulated back normal constant charge current I
1, continue normal constant charging process.
When charging voltage arrives balanced cut-in voltage V
BalancedThe time; The BMS system receives after lithium battery 4 voltages that tension measuring circuit 18 measures; At first can utilize formula (5) that the voltage of each lithium battery 4 is calibrated, after the influence of eliminating 3 pairs of measuring voltages of series resistance, calculate the voltage difference Δ V between the lithium battery 4 again
The electricity core, according to Δ V
The electricity coreThe size of value judges whether to discharge or electric weight shifts, and realizes the accurate measurement to lithium battery module 1 equalizing voltage.
If BMS system 8 adopts the mop-up equalization mode, in charging, also be to use formula (5) that lithium battery 4 measuring voltages are calibrated; But in discharge process, need to use formula (6) that lithium battery 4 measuring voltages are calibrated, to eliminate the influence of series resistance.
Claims (3)
1. high accuracy lithium battery module electric voltage equalization method is characterized in that:
Be I at first at the input constant current
1The time measure the voltage V of each lithium battery in the series loop
I1, i=1～N changes into I with the constant current of input then
2, measure the voltage V that electric current changes each lithium battery of back with same method
I2, the voltage V of i the lithium battery that measures
I1And V
I2Be actually i lithium battery voltage E
I1And E
I2With series resistance R
iThe Overlay of last pressure drop, promptly
V
i1＝E
i1+I
1R
i，V
i2＝E
i2+I
2R
i (1)
Twice measured voltage difference is:
V
i1-V
i2＝E
i1-E
i2+(I
1-I
2)R
i (2)
The time interval of above-mentioned twice measurement is short to be similar to thinks that the voltage of battery does not change between twice measurement, i.e. E
I1=E
I2, formula (2) is reduced to so
V
i1-V
i2＝(I
1-I
2)R
i (3)
Obtain series resistance R by (3) formula
i:
R
i＝(V
i1-V
i2)/(I
1-I
2) (4)
Utilize said method to obtain the relevant series resistance of whole N lithium battery;
Series resistance is returned to I with electric current after measuring and accomplishing
1, continue normal charging process;
In follow-up lithium battery voltage balancing procedure, utilize the series resistance R that measures
iVoltage to i lithium battery is calibrated, and calibration equation is in charging process:
E
i＝V
i-IR
i； (5)
Calibration equation is in discharge process:
E
i＝V
i+IR
i。(6)
2. high accuracy lithium battery module electric voltage equalization method as claimed in claim 1; It is characterized in that; Wherein measuring the flow process of series resistance can implement in the stage of charge or discharge; Also can when battery modules is out-of-work, carry out, as long as can in the series loop of lithium battery module, import described two kinds of different constant current I
1And I
2, and the voltage of whole lithium batteries measured get final product.
3. high accuracy lithium battery module electric voltage equalization method as claimed in claim 1; It is characterized in that; The series impedance that in the calibration process that lithium battery voltage is measured, uses; Can in each charge and discharge cycles process, all carry out 1 time or repeatedly measure, also can just measure later in charge and discharge cycles repeatedly.
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|---|---|---|---|
| CN2012100626016A CN102593917A (en) | 2012-03-12 | 2012-03-12 | Voltage balancing method of high-precision lithium battery module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242416A (en) * | 2014-10-23 | 2014-12-24 | 河南爱浪车业有限公司 | Storage battery charging management system of electric bicycle |
| CN106124993A (en) * | 2016-05-11 | 2016-11-16 | 法拉第未来公司 | The monitoring voltage of battery modules |
| CN109638907A (en) * | 2018-11-28 | 2019-04-16 | 江苏南自通华电力自动化股份有限公司 | Battery group monomer voltage On-line Measuring Method based on high current active equalization |
| CN109828208A (en) * | 2019-01-25 | 2019-05-31 | 中山华野新能源有限公司 | A kind of sampling with high precision algorithm and voltage sampling circuit for lithium battery voltage |
| CN111063944A (en) * | 2018-10-16 | 2020-04-24 | 宁德时代新能源科技股份有限公司 | Cell voltage correction method, device, equipment and medium |
| CN113193284A (en) * | 2021-04-27 | 2021-07-30 | 江苏爱玛车业科技有限公司 | Battery cell assembling structure and electric bicycle |
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| WO2010042898A1 (en) * | 2008-10-10 | 2010-04-15 | Deeya Energy Technologies, Inc. | Method and apparatus for determining state of charge of a battery |
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| US20060012372A1 (en) * | 2003-01-08 | 2006-01-19 | Hitachi, Ltd. | Power control unit |
| WO2010042898A1 (en) * | 2008-10-10 | 2010-04-15 | Deeya Energy Technologies, Inc. | Method and apparatus for determining state of charge of a battery |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242416A (en) * | 2014-10-23 | 2014-12-24 | 河南爱浪车业有限公司 | Storage battery charging management system of electric bicycle |
| CN106124993A (en) * | 2016-05-11 | 2016-11-16 | 法拉第未来公司 | The monitoring voltage of battery modules |
| CN106124993B (en) * | 2016-05-11 | 2019-04-26 | 法拉第未来公司 | The voltage monitoring of battery modules |
| CN111063944A (en) * | 2018-10-16 | 2020-04-24 | 宁德时代新能源科技股份有限公司 | Cell voltage correction method, device, equipment and medium |
| CN112909361A (en) * | 2018-10-16 | 2021-06-04 | 宁德时代新能源科技股份有限公司 | Cell voltage correction method, device, equipment and medium |
| CN112909362A (en) * | 2018-10-16 | 2021-06-04 | 宁德时代新能源科技股份有限公司 | Cell voltage correction method, device, equipment and medium |
| CN112909362B (en) * | 2018-10-16 | 2022-06-10 | 宁德时代新能源科技股份有限公司 | Cell voltage correction method, device, equipment and medium |
| CN112909361B (en) * | 2018-10-16 | 2023-03-31 | 宁德时代新能源科技股份有限公司 | Cell voltage correction method, device, equipment and medium |
| CN109638907A (en) * | 2018-11-28 | 2019-04-16 | 江苏南自通华电力自动化股份有限公司 | Battery group monomer voltage On-line Measuring Method based on high current active equalization |
| CN109638907B (en) * | 2018-11-28 | 2020-11-03 | 江苏南自通华电力自动化股份有限公司 | Storage battery pack monomer voltage on-line measurement method based on large-current active equalization |
| CN109828208A (en) * | 2019-01-25 | 2019-05-31 | 中山华野新能源有限公司 | A kind of sampling with high precision algorithm and voltage sampling circuit for lithium battery voltage |
| CN113193284A (en) * | 2021-04-27 | 2021-07-30 | 江苏爱玛车业科技有限公司 | Battery cell assembling structure and electric bicycle |
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Application publication date: 20120718 |