CN108982969A - A kind of Vehicular battery internal resistance measurement method and device - Google Patents
A kind of Vehicular battery internal resistance measurement method and device Download PDFInfo
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- CN108982969A CN108982969A CN201710404181.8A CN201710404181A CN108982969A CN 108982969 A CN108982969 A CN 108982969A CN 201710404181 A CN201710404181 A CN 201710404181A CN 108982969 A CN108982969 A CN 108982969A
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- 238000000691 measurement method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000001360 synchronised effect Effects 0.000 claims description 24
- 230000001960 triggered effect Effects 0.000 claims description 22
- 230000005611 electricity Effects 0.000 claims description 14
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The embodiment of the present invention provides a kind of internal resistance of cell measurement method and device, by the first output voltage values U for acquiring battery unit for vehicles to be measured at the first moment1And corresponding first output current value I1, and acquire at the second moment the second output voltage values U of battery unit for vehicles to be measured2And corresponding second output current value I2, then pass through formula " R1=(U2‑U1)/(I1‑I2) " internal resistance value R of the battery unit for vehicles to be measured within the first moment to the second time section is calculated1It that is to say, scheme provided by the invention is to calculate internal resistance value corresponding to period of the battery unit for vehicles to be measured between the two moment by acquiring the output voltage and output electric current of battery unit for vehicles to be measured in two different moments, therefore, the scheme provided through the invention can measure the internal resistance value of the battery unit for vehicles to be measured under each different time sections, and then can carry out dynamic real-time measurement to the internal resistance value of the battery unit for vehicles to be measured in use.
Description
Technical field
The present invention relates to electric automobile power battery technical field more particularly to a kind of Vehicular battery internal resistance measurement method and
Device.
Background technique
With the development of science and technology, electric car is more more and more universal, the power resources of existing electric car rely on lithium electric mostly
Pond, the health status situation of accurate judgement lithium battery are the preconditions of lithium battery safe handling, and existing lithium battery manages skill
Art be mostly by monitoring voltage, electric current, temperature, the health status situation for judging using parameters such as cycle lives lithium battery,
And it has no idea to be detected in real time as the internal resistance that lithium battery health parameters most intuitively embody.Existing measurement vehicle lithium electricity
The method of pond internal resistance is mainly to measure under line, specifically, comprising: battery pack is taken testboard, is measured with internal resistance instrument.
However the method measured under line can only measure the static internal resistance of lithium battery, dynamic internal resistance can not be measured, be that is to say
Therefore how the dynamic internal resistance for saying that measurement is unable to real-time measurement lithium battery under line effectively measures in the real-time dynamic of lithium battery
Resistance becomes major issue urgently to be resolved.
Summary of the invention
Internal resistance of cell measurement method provided by the invention and device, mainly solving the technical problems that: exist in the prior art
Mostly measure under line by internal resistance instrument to realize when being measured to the internal resistance of Vehicular battery, it can not be in Vehicular battery
Resistance carries out the problem of dynamic real-time measurement.
In order to solve the above technical problems, the present invention provides a kind of Vehicular battery internal resistance measurement method, comprising:
The first output voltage values U of battery unit for vehicles to be measured is acquired at the first moment1And corresponding first output electricity
Flow valuve I1；
The second output voltage values U of battery unit for vehicles to be measured is acquired at the second moment2And corresponding second output electricity
Flow valuve I2；
It is calculated by the following formula to obtain the battery unit for vehicles to be measured at first moment to second moment
Internal resistance value R in period1:
R1=(U2-U1)/(I1-I2)。
Further, at the time of second moment is that default acquisition condition is triggered, the default acquisition condition includes:
The output voltage values of the battery unit for vehicles to be measured change；
Or,
The output current value of the battery unit for vehicles to be measured changes；
Or,
The prefixed time interval that timing finishing is acquired since first moment reaches, and the Vehicular battery list to be measured
The output current value and/or output voltage values of member change.
Further, the second output voltage values U that battery unit for vehicles to be measured is acquired at the second moment2And it is corresponding
The second output current value I2Later further include:
Whether the default acquisition condition is again triggered within a preset period of time for judgement；
When the judgment result is yes, each triggering moment acquisition respectively in the preset time period is described to be measured automobile-used
The output voltage values of battery unit and corresponding output current value；
According to the output voltage values of battery unit for vehicles to be measured described under each adjacent triggering moment and corresponding output electric current
Value calculates separately the battery unit for vehicles to be measured internal resistance respectively corresponding under each adjacent triggering moment period
Value.
Further, the quantity of the battery unit for vehicles to be measured is more than or equal to 2, and vehicle electric to be measured described at least two
Pool unit is serially connected composition series-connected cell group, output voltage values of acquisition battery unit for vehicles to be measured and corresponding defeated
Current value includes: out
Each battery unit for vehicles both ends to be measured in the series-connected cell group are acquired by a voltage modulus collector
Output voltage values, and pass through the corresponding output current value of series-connected cell group described in an electric current modulus collector synchronous acquisition；
Or,
Each battery unit for vehicles two to be measured in the series-connected cell group is acquired by a voltage and current modulus collector
The output voltage values at end, and the corresponding output electric current of the series-connected cell group is acquired by the voltage and current modulus collector
Value；
Or,
Each battery unit for vehicles to be measured in the series-connected cell group is acquired respectively by different voltage modulus collectors
The output voltage values at both ends, and pass through the corresponding output electric current of series-connected cell group described in an electric current modulus collector synchronous acquisition
Value.
Further, the quantity of the battery unit for vehicles to be measured is more than or equal to 2, and vehicle electric to be measured described at least two
Pool unit composition batteries in parallel connection group parallel with one another, output voltage values of acquisition battery unit for vehicles to be measured and corresponding defeated
Current value includes: out
The output of each battery unit for vehicles to be measured in the batteries in parallel connection group is acquired by an electric current modulus collector
Current value, and pass through the corresponding output voltage values of batteries in parallel connection group described in a voltage modulus collector synchronous acquisition；
Or,
Each battery unit for vehicles to be measured in the batteries in parallel connection group is acquired by a voltage and current modulus collector
Output current value, and the corresponding output voltage values of the batteries in parallel connection group are acquired by the voltage and current modulus collector；
Or,
Each battery unit for vehicles to be measured in the batteries in parallel connection group is acquired respectively by different electric current modulus collectors
Output current value, and pass through the corresponding output voltage values of batteries in parallel connection group described in voltage modulus collector synchronous acquisition.
The present invention also provides a kind of Vehicular battery internal resistance measurement devices, comprising:
Acquisition module, for acquiring the first output voltage values U of battery unit for vehicles to be measured at the first moment1And it is corresponding
The first output current value I1, and acquire at the second moment the second output voltage values U of battery unit for vehicles to be measured2And it is corresponding
The second output current value I2；
Computing module, for be calculated by the following formula to obtain the battery unit for vehicles to be measured first moment extremely
Internal resistance value R in the second time section1:
R1=(U2-U1)/(I1-I2)。
Further, the acquisition module is used for when the output voltage values of the battery unit for vehicles to be measured change
Carry out the second output voltage values U2And corresponding second output current value I2Acquisition；Or in the Vehicular battery to be measured
The second output voltage values U is carried out when the output current value of unit changes2And corresponding second output current value I2Adopt
Collection；Or the prefixed time interval for the timing finishing acquisition since first moment reaches, and the vehicle electric to be measured
When the output current value and/or output voltage values of pool unit change, the second output voltage values U is carried out2And corresponding
Two output current value I2Acquisition.
Further, the acquisition module is used to acquire the second output voltage of battery unit for vehicles to be measured at the second moment
Value U2And corresponding second output current value I2Later, determine that the default acquisition condition described within a preset period of time is touched again
When hair, the output voltage values and corresponding output electric current of the battery unit for vehicles to be measured are acquired in each triggering moment respectively
Value；The computing module is used for according to the output voltage values of battery unit for vehicles to be measured described under each adjacent triggering moment and corresponding
Output current value, calculate separately the battery unit for vehicles to be measured respective institute under each adjacent triggering moment period
Corresponding internal resistance value.
Further, the quantity of the battery unit for vehicles to be measured is more than or equal to 2, and vehicle electric to be measured described at least two
Pool unit is serially connected composition series-connected cell group；
The acquisition module includes a voltage modulus collector and an electric current modulus collector；The voltage modulus is adopted
Storage is used to acquire the output voltage values at each battery unit for vehicles both ends to be measured in the series-connected cell group, the electric current modulus
Collector is for the corresponding output current value of series-connected cell group described in synchronous acquisition；
Or,
The acquisition module includes a voltage and current modulus collector, and the voltage and current modulus collector is for acquiring
The output voltage values at each battery unit for vehicles both ends to be measured in the series-connected cell group, and it is corresponding to acquire the series-connected cell group
Output current value；
Or,
The acquisition module includes voltage modulus collector and an electric current modulus collector, the voltage modulus collector
Quantity be equal to the quantity of battery unit for vehicles to be measured in the series-connected cell group, the voltage modulus collector is for acquiring institute
The output voltage values at corresponding battery unit for vehicles both ends to be measured in series-connected cell group are stated, the electric current modulus collector is used
The corresponding output current value of series-connected cell group described in synchronous acquisition.
Further, the quantity of the battery unit for vehicles to be measured is more than or equal to 2, and vehicle electric to be measured described at least two
Pool unit composition batteries in parallel connection group parallel with one another；
The acquisition module includes an electric current modulus collector and a voltage modulus collector；The electric current modulus is adopted
Storage is used to acquire the output current value of each battery unit for vehicles to be measured in the batteries in parallel connection group, the voltage modulus acquisition
Device is for the corresponding output voltage values of batteries in parallel connection group described in synchronous acquisition；
Or,
The acquisition module includes a voltage and current modulus collector, and the voltage and current modulus collector is for acquiring
The output current value of each battery unit for vehicles to be measured in the batteries in parallel connection group, and it is corresponding defeated to acquire the batteries in parallel connection group
Voltage value out；
Or,
The acquisition module includes electric current modulus collector and a voltage modulus collector, the electric current modulus collector
Quantity be equal to the quantity of battery unit for vehicles to be measured in the batteries in parallel connection group, the electric current modulus collector acquisition is described simultaneously
Join the output current value of corresponding battery unit for vehicles to be measured in battery pack, the voltage modulus collector is adopted for synchronizing
Collect the corresponding output voltage values of the batteries in parallel connection group.
The beneficial effects of the present invention are:
Internal resistance of cell measurement method provided by the invention and device, by acquiring battery unit for vehicles to be measured at the first moment
The first output voltage values U1And corresponding first output current value I1, and battery unit for vehicles to be measured is acquired at the second moment
The second output voltage values U2And corresponding second output current value I2, then pass through formula " R1=(U2-U1)/(I1-I2)”
Internal resistance value R of the battery unit for vehicles to be measured within the first moment to the second time section is calculated1, that is to say, the present invention
The scheme of offer is calculated in the output voltage of two different moments with output electric current by acquisition battery unit for vehicles to be measured
Internal resistance value corresponding to period of the battery unit for vehicles to be measured between the two moment, therefore, provide through the invention
Scheme can measure the internal resistance value of the battery unit for vehicles to be measured under each different time sections, and then measuring car can be waited for this
Dynamic real-time measurement is carried out with the internal resistance value of battery unit in use.
Detailed description of the invention
Fig. 1 is the electrical block diagram of battery unit for vehicles to be measured in the embodiment of the present invention one；
Fig. 2 is the first pass schematic diagram of Vehicular battery internal resistance measurement method in the embodiment of the present invention one；
Fig. 3 is the second procedure schematic diagram of Vehicular battery internal resistance measurement method in the embodiment of the present invention one；
Fig. 4 is the structural schematic diagram of series-connected cell group in the embodiment of the present invention one；
Fig. 5 is the structural schematic diagram of batteries in parallel connection group in the embodiment of the present invention one；
Fig. 6 is the structural schematic diagram of Vehicular battery internal resistance measurement device in the embodiment of the present invention two；
Fig. 7 is the first structure diagram of acquisition module in the embodiment of the present invention two；
Fig. 8 is the second structural schematic diagram of acquisition module in the embodiment of the present invention two；
Fig. 9 is the third structural schematic diagram of acquisition module in the embodiment of the present invention two；
Figure 10 is the 4th structural schematic diagram of acquisition module in the embodiment of the present invention two.
Specific embodiment
The embodiment of the present invention is described in further detail below by specific embodiment combination attached drawing.
Embodiment one:
In order to Vehicular battery
Shown in Figure 1, Fig. 1 is the electrical block diagram of a battery unit for vehicles to be measured in the present embodiment,
Middle UOCFor the electromotive force of source of the battery unit for vehicles to be measured, which is a changeless value, and R is that this is to be measured
The internal resistance of battery unit for vehicles, it should be noted that the internal resistance of in general power supply is not an invariable value, usually
In the case of, the internal resistance of power supply is related with the electric current or voltage that pass through the power supply, UiFor the outside of the battery unit for vehicles to be measured
Apparent voltage that is to say the terminal output voltage of the battery unit for vehicles to be measured, be used for as the company of battery unit for vehicles institute to be measured
The load supplying connect, IiFor the electric current for flowing through the battery unit for vehicles internal resistance to be measured, based on above-mentioned circuit structure the present embodiment
A kind of Vehicular battery internal resistance measurement method is provided, it is shown in Figure 2, comprising:
S201: the first output voltage values U of battery unit for vehicles to be measured is acquired at the first moment1And it is corresponding first defeated
Current value I out1。
S202: the second output voltage values U of battery unit for vehicles to be measured is acquired at the second moment2And it is corresponding second defeated
Current value I out2。
For the first moment, Ui=U1, Ii=I1；For the second moment, Ui=U2, Ii=I2。
It should be understood that at the time of the second moment in the present embodiment is that default acquisition condition is triggered, the present embodiment
In default acquisition condition include following trigger collection condition at least one:
The output voltage values of the battery unit for vehicles to be measured change；
The output current value of the battery unit for vehicles to be measured changes；
The prefixed time interval that timing finishing is acquired since first moment reaches, and the Vehicular battery list to be measured
The output current value and/or output voltage values of member change.
And the first moment in the present embodiment can be current time, namely acquire the defeated of current battery unit for vehicles to be measured
Voltage value and corresponding output current value are as the first output voltage values and the first output current value out, certainly, in the present embodiment
The first moment at the time of be also possible to above-mentioned default acquisition condition and be triggered.
It detects it should also be noted that, detecting that default acquisition condition is triggered can be in the present embodiment and receives survey
The acquisition instructions that examination personnel or user issue.Specifically, user can received in adopting of issuing of two different moments
Collect the output voltage values for the battery unit for vehicles to be measured inscribed when acquiring the two respectively when instruction and exports electric current accordingly
Value.
S203: pass through formula " R1=(U2-U1)/(I1-I2) " be calculated battery unit for vehicles to be measured the first moment extremely
Internal resistance value R in second time section1。
For purposes of illustration only, referred to as triggering moment at the time of default acquisition condition is triggered below, it should be noted that
The first moment and the second moment in the present embodiment can be two adjacent triggering moments.For example, can be in the present embodiment
Detect the output voltage of battery unit for vehicles to be measured by UXVariation is UY(UXNot equal to UY) when, acquire the Vehicular battery to be measured
First output voltage values of unit and corresponding first output current value, collected first output voltage values are U at this timeY, the
One output current value is IY, after acquisition finishes, if detecting the output voltage of Vehicular battery to be measured by UYVariation is UZ(UY
Not equal to UZ), then the second output voltage and corresponding second output electric current of the Vehicular battery to be measured are acquired, it is collected at this time
Second output voltage values are UZ, the second output current value is IZ, then the Vehicular battery to be measured between the two adjacent triggering moments
The internal resistance value R of unitY=(UZ-UY)/(IY-IZ).It is understood that scheme provided in this embodiment to a certain period to
It is this principle progress that immobilized based on Vehicular battery internal resistance value to be measured under the period when survey Vehicular battery internal resistance measures
Calculate, thus in some embodiments the first moment and the second moment may not be adjacent triggering moment, but due to
The internal resistance of Vehicular battery to be measured is different under different voltages, so if the first moment and the second moment are not adjacent triggerings
The internal resistance value possible error for the Vehicular battery to be measured that moment is then calculated is bigger, it is therefore preferred that two phases should be chosen
Adjacent triggering moment is as the first moment and the second moment in this implementation.
Since battery unit for vehicles to be measured is under different voltage or electric current, the size for corresponding to internal resistance may also be different,
Therefore, in order to measure dynamic electric resistor size of the battery unit for vehicles to be measured in entire use process, Fig. 3 is referred to
It is shown, operations described below can also be executed after step S202:
S301: judgement presets whether acquisition condition is again triggered within a preset period of time.
It is acquired it should be understood that the preset time period in the present embodiment can be from second for performing for the second moment
Start to the battery unit for vehicles to be measured to terminate this period of power supply, is also possible to user or tester arbitrarily makes by oneself
The period of justice.
S302: when the judgment result is yes, each triggering moment within a preset period of time acquires vehicle electric to be measured respectively
The output voltage values of pool unit and corresponding output current value.
For ease of understanding, it is assumed here that preset acquisition condition within a preset period of time and be triggered four times.It include: in third
Moment detects the output voltage of battery unit for vehicles to be measured by U2It is transformed to U3, the corresponding electric current that exports is by I2It is transformed to I3,
4th moment detected the output voltage of battery unit for vehicles to be measured by U3It is transformed to U4, the corresponding electric current that exports is by I3It is transformed to
I4, detect the output voltage of battery unit for vehicles to be measured by U at the 5th moment4It is transformed to U5, the corresponding electric current that exports is by I4Become
It is changed to I5, detect the output voltage of battery unit for vehicles to be measured by U at the 6th moment5It is transformed to U6, it is corresponding export electric current by
I5It is transformed to I6。
For above situation, it is necessary to acquire the third output voltage of the battery unit for vehicles to be measured at the third moment respectively
Value U3With corresponding third output current value I3；The 4th output voltage values of the battery unit for vehicles to be measured are acquired at the 4th moment
U4With corresponding 4th output current value I4；The 5th output voltage values U of the battery unit for vehicles to be measured is acquired at the 5th moment5
With corresponding 5th output current value I5；The 6th output voltage values U of the battery unit for vehicles to be measured is acquired at the 6th moment6With
Corresponding 6th output current value I6。
S303: according to the output voltage values of battery unit for vehicles to be measured under each adjacent triggering moment and corresponding output electric current
Value calculates separately battery unit for vehicles to be measured internal resistance value respectively corresponding under each adjacent triggering moment period.
It is directed to above situation, needs to calculate battery unit for vehicles to be measured at the first moment to the second moment, second
It carves to the third moment, at the third moment to the 4th moment, at the 5th moment to the internal resistance value between the 6th moment, specific formula for calculation is such as
Under:
First moment to the second moment: R1=(U2-U1)/(I1-I2)；
Second moment to the third moment: R2=(U3-U2)/(I2-I3)；
Third moment to the 4th moment: R3=(U4-U3)/(I3-I4)；
4th moment to the 5th moment: R4=(U5-U4)/(I4-I5)；
5th moment to the 6th moment: R5=(U6-U5)/(I5-I6)。
Above content is the explanation carried out for presetting acquisition condition in preset time period and being triggered four times, is answered
When understanding, when carrying out the measurement of internal resistance to the battery unit for vehicles to be measured in use process, which can
With the n times that are triggered, n can take any integer more than or equal to 1.
(n-1) moment to the n-th moment: Rn-1=(Un-Un-1)/(In-1-In)。
Wherein, UnAnd InOutput voltage and output electric current for the battery unit for vehicles to be measured collected at the n-th moment；
Un-1And In-1Output voltage and output electric current for the battery unit for vehicles to be measured collected at (n-1) moment, Rn-1It is
(n-1) in this period at moment to the n-th moment battery unit for vehicles to be measured internal resistance value.
For example, preset time period can be set to one month, monitor whether the default acquisition is touched in this month
Hair, once being triggered, inscribes the output voltage values and corresponding output current value of battery unit for vehicles to be measured when just acquiring this, and
According to last and this triggering collected output voltage values of institute and corresponding output current value calculate this trigger twice it is right
The internal resistance value for the period answered, in this way, can calculate this month in the battery unit for vehicles to be measured under each period
Internal resistance value, these internal resistance values can be stored in some embodiments, and it is bent to draw out the variation of corresponding internal resistance value
Line, the size of the length of battery life, the health status situation of battery and the internal resistance of cell is closely bound up under normal conditions, therefore,
The size for the battery unit for vehicles internal resistance to be measured that can be obtained according to measurement, or draw obtained corresponding internal resistance value change curve
Estimate service life or the health status of the battery unit for vehicles to be measured.
It should also be noted that, the quantity of the battery unit for vehicles to be measured in the present embodiment can be more than or equal to 2, and at least
2 battery unit for vehicles to be measured are serially connected composition series-connected cell group, at this point, acquiring the output voltage of battery unit for vehicles to be measured
Value and corresponding output current value can specifically include following three kinds of situations:
Situation one:
It is acquired by a voltage AD (Analog-to-Digital, modulus) collector each to be measured in series-connected cell group
The output voltage values at battery unit for vehicles both ends, and it is corresponding defeated by an electric current AD collector synchronous acquisition series-connected cell group
Current value out；Namely a voltage AD collector and an electric current AD collector is only needed to achieve that the series-connected cell at this time
The acquisition of the output voltage values and output current value of each battery unit for vehicles to be measured is read in group.It of courses, in some implementations
The output voltage values of each battery unit for vehicles to be measured in series-connected cell group under synchronization are obtained in example, can be series connection
Its corresponding voltage sample holding circuit is arranged in each battery unit for vehicles to be measured in battery pack, in order to which it is corresponding
Output voltage values preserve.For example, include three battery unit for vehicles to be measured in series-connected cell group, it is shown in Figure 4, this
Three battery unit for vehicles to be measured are respectively the first battery unit for vehicles 41, the second battery unit for vehicles 42 to be measured and third to be measured
The same voltage AD collector can be used at this time and acquire these three vehicle electrics to be measured of reading respectively for battery unit for vehicles 43 to be measured
Three output voltages of pool unit, for example, can the t1 moment acquire read the first battery unit for vehicles 41 to be measured output voltage
Value acquires the output voltage values for reading the second battery unit for vehicles 42 to be measured at the t2 moment, but may need in some cases
These three battery unit for vehicles to be measured are obtained in three output voltages at the same moment, at this point it is possible to be respectively these three
Battery unit for vehicles to be measured is arranged corresponding voltage sample holding circuit, these three battery unit for vehicles to be measured respectively corresponding to
Voltage sample holding circuit can preserve the voltage of battery unit for vehicles to be measured at a time in order to which voltage AD is adopted
Storage can remove the output voltage for reading lower three battery unit for vehicles to be measured of synchronization respectively, since these three are to be measured automobile-used
Battery cells in series, thus the output electric current of these three battery unit for vehicles to be measured at each moment be it is identical, so electric
The electric current of the stream collected series-connected cell group of AD collector that is to say these three battery unit for vehicles to be measured in the defeated of synchronization
Electric current out.
Situation two:
The defeated of each battery unit for vehicles both ends to be measured in series-connected cell group is acquired by voltage and current AD collector
Voltage value out, and pass through the corresponding output current value of voltage and current AD collector synchronous acquisition series-connected cell group.With above situation
One is identical, may need to obtain under synchronization each battery unit for vehicles to be measured in series-connected cell group in some embodiments
Corresponding voltage sample is arranged in output voltage values, each battery unit for vehicles to be measured at this time or in series-connected cell group
Holding circuit also needs to acquire reading current value, institute since voltage and current AD collector not only needs to acquire reading voltage value
To should be the series-connected cell group and corresponding current sample dimension be arranged to obtain output current value corresponding with output voltage values
Circuit is held, due to each battery unit for vehicles series connection to be measured in the battery pack, so a current sample, which is only arranged, maintains electricity
Road, voltage and current AD collector can go in each voltage sample holding circuit and current sample holding circuit to go to read respectively
Take the output voltage values and output current value of each battery unit for vehicles to be measured under synchronization.Continue to adopt the example in situation one
It is illustrated, only uses a voltage and current AD collector at this time, in contrast, it is possible to reduce testing cost works as voltage and current
AD collector needs to acquire these three battery unit for vehicles to be measured in three output voltages of synchronization, can be respectively this
Corresponding voltage sample holding circuit is arranged in three battery unit for vehicles to be measured, and respectively institute is right for these three battery unit for vehicles to be measured
The voltage sample holding circuit answered can preserve the voltage of battery unit for vehicles to be measured at a time in order to voltage
Electric current AD collector can remove the output voltage for reading lower three battery unit for vehicles to be measured of synchronization respectively, due to the voltage
Electric current AD collector also needs to acquire reading output current value corresponding with output voltage values, and these three Vehicular battery lists to be measured
Member series connection, so shoulding be these three battery unit for vehicles to be measured is arranged a current sample holding circuit, voltage and current AD
Collector can remove in these three voltage sample holding circuits to read these three battery unit for vehicles to be measured at the t3 moment respectively
Output voltage values can also go in current sample holding circuit to inscribe these three battery unit for vehicles to be measured when removing to read corresponding t3
Output current value.
Situation three:
Each battery unit for vehicles both ends to be measured in series-connected cell group are acquired respectively by different voltage AD collectors
Output voltage values, the quantity of voltage AD collector are equal to the quantity of battery unit for vehicles to be measured in series-connected cell group, and pass through one
The corresponding output current value of a electric current AD collector synchronous acquisition series-connected cell group.Due to each of at this time Vehicular battery list to be measured
Member has its corresponding voltage AD collector, even if so corresponding voltage is not arranged for each battery unit for vehicles to be measured at this time
Sampling holding circuit can also realize that the synchronous acquisition of the multiple battery unit for vehicles output voltage values to be measured of synchronization is read.
It should also be noted that, the quantity of the battery unit for vehicles to be measured in the present embodiment can be more than or equal to 2, and at least
2 battery unit for vehicles composition batteries in parallel connection groups parallel with one another to be measured, at this point, acquiring the output voltage of battery unit for vehicles to be measured
Value and corresponding output current value specifically can also following three kinds of situations:
Situation one:
The output current value of each battery unit for vehicles to be measured in batteries in parallel connection group is acquired by an electric current AD collector,
And pass through the corresponding output voltage values of a voltage AD collector synchronous acquisition batteries in parallel connection group.It of courses, in some embodiments
In in order to obtain the output current value of each battery unit for vehicles to be measured in batteries in parallel connection group under synchronization, can be electricity in parallel
Its corresponding current sample holding circuit is arranged in each battery unit for vehicles to be measured in the group of pond, in order to which it is corresponding defeated
Current value preserves out.For example, including four battery unit for vehicles to be measured in batteries in parallel connection group, shown in Figure 5, this four
A battery unit for vehicles to be measured is respectively that the first battery unit for vehicles to be measured 51, the second battery unit for vehicles 52 to be measured, third wait for
Battery unit for vehicles 53 and the 4th battery unit for vehicles 54 to be measured are surveyed, the same electric current AD collector difference can be used at this time
Acquisition read this four battery unit for vehicles to be measured output electric current, such as can the t1 moment acquire reading third it is to be measured automobile-used
The output current value of battery unit 53 acquires the output current value for reading the 4th battery unit for vehicles 54 to be measured at the t2 moment, but
It is that may need to obtain this four battery unit for vehicles to be measured in some cases in four output current values at the same moment,
At this point it is possible to be respectively that corresponding current sample holding circuit is arranged in this four battery unit for vehicles to be measured, this four to measuring car
With battery unit, respectively corresponding current sample holding circuit can be by the electric current of battery unit for vehicles to be measured at a time
It preserves in order to which electric current AD collector can go the output for reading lower four battery unit for vehicles to be measured of synchronization respectively
Electric current, because this four battery unit for vehicles to be measured are in parallel, the voltage of the collected batteries in parallel connection group of voltage AD collector
It also is output voltage of this four battery unit for vehicles to be measured in synchronization,
Situation two:
The output electricity of each battery unit for vehicles to be measured in batteries in parallel connection group is acquired by a voltage and current AD collector
Flow valuve, and pass through the corresponding output voltage values of voltage and current AD collector synchronous acquisition batteries in parallel connection group.With one phase of above situation
Together, it may need to obtain the output of each battery unit for vehicles to be measured in batteries in parallel connection group under synchronization in some embodiments
Current value, each battery unit for vehicles to be measured at this time or in batteries in parallel connection group are arranged corresponding current sample and maintain
Circuit also needs to acquire reading voltage value, so being since voltage and current AD collector not only needs to acquire reading current value
Acquisition output voltage values corresponding with output current value, should be the batteries in parallel connection group corresponding voltage sample are arranged and maintain electricity
Road, since each battery unit for vehicles to be measured in the battery pack is in parallel, so only one voltage sample holding circuit of setting is
Can, voltage and current AD collector can go in each current sample holding circuit and voltage sample holding circuit to go to read same respectively
The output voltage values and output current value of each battery unit for vehicles to be measured are inscribed for the moment.Continue to adopt the example in situation one to carry out
Illustrate, only uses a voltage and current AD collector at this time, in contrast, it is possible to reduce testing cost, when voltage and current AD is adopted
Storage needs to acquire this four battery unit for vehicles to be measured in four output electric currents of synchronization, can be respectively this four
Battery unit for vehicles to be measured is arranged corresponding current sample holding circuit, this four battery unit for vehicles to be measured respectively corresponding to
Current sample holding circuit can preserve the electric current of battery unit for vehicles to be measured at a time in order to voltage and current
AD collector can remove the output electric current for reading lower four battery unit for vehicles to be measured of synchronization respectively, due to the voltage and current
AD collector also needs to acquire reading output voltage values corresponding with output current value, and this four battery unit for vehicles to be measured are simultaneously
Connection, so shoulding be this four battery unit for vehicles to be measured is arranged a voltage sample holding circuit, voltage and current AD acquisition
Device can remove in this four current sample holding circuits to read this four battery unit for vehicles to be measured in the output at t3 moment respectively
Current value can also go in voltage sample holding circuit to inscribe the defeated of this four battery unit for vehicles to be measured when removing to read corresponding t3
Voltage value out.
Situation three:
Acquire the output of each battery unit for vehicles to be measured in batteries in parallel connection group respectively by different electric current AD collectors
Current value, the quantity of electric current AD collector are equal to the quantity of battery unit for vehicles to be measured in batteries in parallel connection group, that is to say one to
The corresponding electric current AD collector of battery unit for vehicles is surveyed, and passes through a voltage AD collector synchronous acquisition batteries in parallel connection group pair
The output voltage values answered.Since battery unit for vehicles to be measured has its corresponding electric current AD collector each of at this time, so this
When can also realize that synchronization is multiple even if corresponding current sample holding circuit not being arranged for each battery unit for vehicles to be measured
The synchronous acquisition of battery unit for vehicles output current value to be measured is read.
Either series-connected cell group or batteries in parallel connection group can collect each vehicle electric to be measured by the above method
Output voltage values and output current value of the pool unit under synchronization, and then can be obtained by the measurement method of above-mentioned offer
Each battery unit for vehicles to be measured corresponding internal resistance value under the same period, by comparing each to measuring car under the same period
With the size of battery internal resistance value, so that it may filter out faulty battery cell.
Finally it should also be noted that, the battery unit for vehicles to be measured in the present embodiment can be monocell, and by more
A power circuit monocell parallel connection and/or be composed in series.
Vehicular battery internal resistance measurement method provided in this embodiment, by acquiring battery unit for vehicles to be measured in different moments
Under output voltage and corresponding output electric current obtain the internal resistance value of the battery unit for vehicles to be measured corresponding period Nei, thus reality
The dynamic real-time measurement of battery unit for vehicles internal resistance value is showed.
Embodiment two:
Shown in Figure 6, the present embodiment provides a kind of Vehicular battery internal resistance measurement devices, including acquisition module 61 and meter
Calculate module 62, wherein acquisition module 61 is used to acquire the first output voltage values U of battery unit for vehicles to be measured at the first moment1
And corresponding first output current value I1, and acquire at the second moment the second output voltage values U of battery unit for vehicles to be measured2
And corresponding second output current value I2；Computing module 62 is used to pass through formula " R1=(U2-U1)/(I1-I2) " be calculated
Internal resistance value R of the battery unit for vehicles to be measured within the first moment to the second time section1, acquisition module 61 in the present embodiment
Function can be realized by building corresponding peripheral circuit.
It should be understood that at the time of the second moment in the present embodiment is that default acquisition condition is triggered, the present embodiment
In default acquisition condition include following trigger collection condition at least one:
The output voltage values of the battery unit for vehicles to be measured change；
The output current value of the battery unit for vehicles to be measured changes；
The prefixed time interval that timing finishing is acquired since first moment reaches, and the Vehicular battery list to be measured
The output current value and/or output voltage values of member change.
Specifically, the acquisition module 61 in the present embodiment is used to occur in the output voltage values of battery unit for vehicles to be measured
The second output voltage values U is carried out when variation2And corresponding second output current value I2Acquisition；Or in vehicle electric to be measured
The second output voltage values U is carried out when the output current value of pool unit changes2And corresponding second output current value I2Adopt
Collection；Or the prefixed time interval for the timing finishing acquisition since the first moment reaches, and battery unit for vehicles to be measured
When output current value and/or output voltage values change, the second output voltage values U is carried out2And corresponding second output electricity
Flow valuve I2Acquisition.
It should be understood that the first moment in the present embodiment can be current time, namely acquire current to be measured automobile-used
The output voltage values of battery unit and corresponding output current value as the first output voltage values and the first output current value, when
So, at the time of the first moment in the present embodiment is also possible to above-mentioned default acquisition condition and is triggered.
In addition it is also necessary to illustrate, the acquisition module 61 in the present embodiment can receive tester or use
The acquisition of output voltage and corresponding output electric current is just carried out when the acquisition instructions that family issues.
For purposes of illustration only, referred to as triggering moment at the time of default acquisition condition is triggered below, it should be noted that
The first moment and the second moment in the present embodiment can be two adjacent triggering moments.For example, the acquisition in the present embodiment
Module 61 can be in the output electric current for detecting battery unit for vehicles to be measured by IXVariation is IY(IXNot equal to IY) when, acquisition should
First output current value of battery unit for vehicles to be measured and corresponding first output voltage values, collected first output is electric at this time
Pressure value is UY, the first output current value is IY, after acquisition finishes, if detecting the output electric current of Vehicular battery to be measured by IY
Variation is IZ(IYNot equal to IZ), then the second output voltage and corresponding second output electric current of the Vehicular battery to be measured are acquired, this
When collected second output voltage values be UZ, the second output current value is IZ, then between the two adjacent triggering moments to
Survey the internal resistance value R of battery unit for vehiclesY=(UZ-UY)/(IY-IZ).It is understood that scheme provided in this embodiment is to certain
It is that this is immobilized based on Vehicular battery internal resistance value to be measured under the period when Vehicular battery internal resistance to be measured of one period measures
What a principle was calculated, so when the first moment and the second moment may not be adjacent triggering in some embodiments
Carve, but since the internal resistance of Vehicular battery to be measured under different voltages is different, so if the first moment and the second moment not
Be the Vehicular battery to be measured that adjacent triggering moment is then calculated internal resistance value possible error it is bigger, it is therefore preferred that answering
When the two adjacent triggering moments of selection are as the first moment and the second moment in this implementation.
Since battery unit for vehicles to be measured is under different voltage or electric current, the size for corresponding to internal resistance may also be different,
Therefore, in order to measuring dynamic electric resistor size of the battery unit for vehicles to be measured in entire use process, therefore this reality
Apply the second output voltage values U that the acquisition module 61 in example acquires the battery unit for vehicles to be measured at the second moment2And phase
The the second output current value I answered2Later, when determining that the default acquisition condition described within a preset period of time is again triggered, respectively
The output voltage values and corresponding output current value of battery unit for vehicles to be measured are acquired in each triggering moment；Computing module 62 is used
In output voltage values and corresponding output current value according to battery unit for vehicles to be measured under each adjacent triggering moment, calculate separately
Battery unit for vehicles to be measured internal resistance value respectively corresponding under each adjacent triggering moment period.
It is acquired it should be understood that the preset time period in the present embodiment can be from second for performing for the second moment
Start to the battery unit for vehicles to be measured to terminate this period of power supply, is also possible to user or tester arbitrarily makes by oneself
The period of justice.
For ease of understanding, it is assumed here that preset acquisition condition within a preset period of time and be triggered four times.It include: in third
Moment detects the output voltage of battery unit for vehicles to be measured by U2It is transformed to U3, the corresponding electric current that exports is by I2It is transformed to I3,
4th moment detected the output voltage of battery unit for vehicles to be measured by U3It is transformed to U4, the corresponding electric current that exports is by I3It is transformed to
I4, detect the output voltage of battery unit for vehicles to be measured by U at the 5th moment4It is transformed to U5, the corresponding electric current that exports is by I4Become
It is changed to I5, detect the output voltage of battery unit for vehicles to be measured by U at the 6th moment5It is transformed to U6, it is corresponding export electric current by
I5It is transformed to I6。
For above situation, it is necessary to acquire the third output voltage of the battery unit for vehicles to be measured at the third moment respectively
Value U3With corresponding third output current value I3；The 4th output voltage values of the battery unit for vehicles to be measured are acquired at the 4th moment
U4With corresponding 4th output current value I4；The 5th output voltage values U of the battery unit for vehicles to be measured is acquired at the 5th moment5
With corresponding 5th output current value I5；The 6th output voltage values U of the battery unit for vehicles to be measured is acquired at the 6th moment6With
Corresponding 6th output current value I6。
It is directed to above situation, needs to calculate battery unit for vehicles to be measured at the first moment to the second moment, second
It carves to the third moment, at the third moment to the 4th moment, at the 5th moment to the internal resistance value between the 6th moment, specific formula for calculation is such as
Under:
First moment to the second moment: R1=(U2-U1)/(I1-I2)；
Second moment to the third moment: R2=(U3-U2)/(I2-I3)；
Third moment to the 4th moment: R3=(U4-U3)/(I3-I4)；
4th moment to the 5th moment: R4=(U5-U4)/(I4-I5)；
5th moment to the 6th moment: R5=(U6-U5)/(I5-I6)。
Above content is the explanation carried out for presetting acquisition condition in preset time period and being triggered four times, is answered
When understanding, when carrying out the measurement of internal resistance to the battery unit for vehicles to be measured in use process, which can
With the n times that are triggered, N can take any integer more than or equal to 1.
(n-1) moment to the n-th moment: Rn-1=(Un-Un-1)/(In-1-In)。
Wherein, UnAnd InOutput voltage and output electric current for the battery unit for vehicles to be measured collected at the n-th moment；
Un-1And In-1Output voltage and output electric current for the battery unit for vehicles to be measured collected at (n-1) moment, Rn-1It is
(n-1) in this period at moment to the n-th moment battery unit for vehicles to be measured internal resistance value.
For example, preset time period can be set to one month, monitor whether the default acquisition is touched in this month
Hair, once being triggered, inscribes the output voltage values and corresponding output current value of battery unit for vehicles to be measured when just acquiring this, and
According to last and this triggering collected output voltage values of institute and corresponding output current value calculate this trigger twice it is right
The internal resistance value for the period answered, in this way, can calculate this month in the battery unit for vehicles to be measured under each period
Internal resistance value, these internal resistance values can be stored in some embodiments, and it is bent to draw out the variation of corresponding internal resistance value
Line, the size of the length of battery life, the health status situation of battery and the internal resistance of cell is closely bound up under normal conditions, therefore,
The size for the battery unit for vehicles internal resistance to be measured that can be obtained according to measurement, or draw obtained corresponding internal resistance value change curve
Estimate service life or the health status of the battery unit for vehicles to be measured.
It should also be noted that, the quantity of the battery unit for vehicles to be measured in the present embodiment can be more than or equal to 2, and at least
2 battery unit for vehicles to be measured be serially connected composition series-connected cell group, at this point, in the present embodiment acquisition module 61 specific structure
May include following three kinds:
First structure:
Acquisition module 61 includes a voltage AD collector 611 and an electric current AD collector 612, shown in Figure 7, electricity
Pressure AD collector 611 is used to acquire the output voltage values at each battery unit for vehicles both ends to be measured in series-connected cell group, electric current AD
Collector 612 is used for the corresponding output current value of synchronous acquisition series-connected cell group.Certainly, in some embodiments, in order to obtain
Under synchronization in series-connected cell group each battery unit for vehicles to be measured output voltage values, in the acquisition module 61 in the present embodiment
It can also include voltage sample holding circuit, the output voltage values for treating survey battery unit for vehicles are saved, in order to
Voltage AD collector 611 can acquire reading and obtain the output voltage values of each battery unit for vehicles to be measured under synchronization.
Second structure:
Acquisition module 61 includes a voltage and current AD collector 613, shown in Figure 8, voltage and current AD collector 613
For acquiring the output voltage values at each battery unit for vehicles both ends to be measured in series-connected cell group, and it is corresponding to acquire series-connected cell group
Output current value.It should be noted that output current value and output voltage values pair that voltage and current AD collector 613 acquires
It answers, in other words voltage and current AD collector should be the output voltage of each battery unit for vehicles to be measured under the synchronization acquired
Therefore value and output current value in order to guarantee the consistency of time, can also wrap in the acquisition module 61 in the present embodiment at this time
Include a current sample holding circuit.Certainly, in some embodiments, in order to obtain under synchronization in series-connected cell group respectively to
The output voltage values of battery unit for vehicles are surveyed, can also include that voltage sample maintains electricity in the acquisition module 61 in the present embodiment
Road, the output voltage values for treating survey battery unit for vehicles are saved, in order to which voltage and current AD collector 613 can be read
Obtain the output voltage values of each battery unit for vehicles to be measured under synchronization.
Third structure:
Acquisition module 61 includes voltage AD collector 611 and an electric current AD collector 612, shown in Figure 9, voltage AD
The quantity of collector 611 is equal to the quantity of battery unit for vehicles to be measured in series-connected cell group, and voltage AD collector 611 is for acquiring
The output voltage values at corresponding battery unit for vehicles both ends to be measured in series-connected cell group, electric current AD collector 612 is for same
The corresponding output current value of step acquisition series-connected cell group.
It should also be noted that, the quantity of the battery unit for vehicles to be measured in the present embodiment can be more than or equal to 2, and at least
2 battery unit for vehicles composition batteries in parallel connection groups parallel with one another to be measured, at this point, in the present embodiment acquisition module 61 specific structure
Also may include following three kinds:
First structure:
Acquisition module 61 includes an electric current AD collector 612 and a voltage AD collector 611；Electric current AD collector
612 for acquiring the output current value of each battery unit for vehicles to be measured in batteries in parallel connection group, and voltage AD collector 611 is for same
The corresponding output voltage values of step acquisition batteries in parallel connection group.Certainly, in some embodiments, in parallel electric under synchronization in order to obtain
The output current value of each battery unit for vehicles to be measured in the group of pond can also be adopted including electric current in the acquisition module 61 in the present embodiment
Sample holding circuit, the output current value for treating survey battery unit for vehicles is saved, in order to which electric current AD collector 612 can
The output current value of each battery unit for vehicles to be measured under synchronization is obtained to read.
Second structure:
Acquisition module 61 includes a voltage and current AD collector 613, and voltage and current AD collector 613 is for acquiring parallel connection
The output current value of each battery unit for vehicles to be measured in battery pack, and the corresponding output voltage of synchronous acquisition batteries in parallel connection group
Value.It should be noted that the output current value that voltage and current AD collector 613 acquires is corresponding with output voltage values, in other words
Voltage and current AD collector should be the output voltage values of each battery unit for vehicles to be measured and output electricity under the synchronization acquired
Therefore flow valuve can also include a voltage in the acquisition module 61 in the present embodiment at this time to guarantee the consistency of time
Sample holding circuit.Certainly, in some embodiments, in order to obtain under synchronization each Vehicular battery to be measured in batteries in parallel connection group
The output current value of unit can also include current sample holding circuit in the acquisition module 61 in the present embodiment, for treating
Survey battery unit for vehicles output current value saved, in order to voltage and current AD collector 613 can read to obtain it is same
When inscribe the output current value of each battery unit for vehicles to be measured.
Third structure:
Acquisition module 61 includes electric current AD collector 612 and a voltage AD collector 611, shown in Figure 10, electricity
Quantity of the quantity equal to battery unit for vehicles to be measured in batteries in parallel connection group of AD collector 612 is flowed, electric current AD collector 612 acquires
The output current value of corresponding battery unit for vehicles to be measured in batteries in parallel connection group, voltage AD collector 611 are adopted for synchronizing
Collect the corresponding output voltage values of batteries in parallel connection group.
Finally it should also be noted that, the battery unit for vehicles to be measured in the present embodiment can be monocell, and by more
A power circuit monocell parallel connection and/or be composed in series.
Vehicular battery internal resistance measurement device provided in this embodiment acquires battery unit for vehicles to be measured by acquisition module and exists
Output voltage under different moments and corresponding output electric current, and the corresponding period is calculated by computing module interior this is to be measured
The internal resistance value of battery unit for vehicles, to realize the dynamic real-time measurement of battery unit for vehicles internal resistance value.
Obviously, those skilled in the art should be understood that each module of the embodiments of the present invention or each step can be used
General computing device realizes that they can be concentrated on a single computing device, or be distributed in multiple computing device institutes
On the network of composition, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by them
It is stored in computer storage medium (ROM/RAM, magnetic disk, CD) and is performed by computing device, and in some cases, it can
With the steps shown or described are performed in an order that is different from the one herein, or they are fabricated to each integrated circuit dies
Block, or single integrated circuit module is maked multiple modules or steps in them to realize.So the present invention does not limit
It is combined in any specific hardware and software.
The above content is combining specific embodiment to be further described to made by the embodiment of the present invention, cannot recognize
Fixed specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention
Protection scope.
Claims (10)
1. a kind of Vehicular battery internal resistance measurement method characterized by comprising
The first output voltage values U of battery unit for vehicles to be measured is acquired at the first moment1And corresponding first output current value
I1；
The second output voltage values U of the battery unit for vehicles to be measured is acquired at the second moment2And corresponding second output electric current
Value I2；
It is calculated by the following formula to obtain the battery unit for vehicles to be measured at first moment to second time
Internal resistance value R in section1:
R1=(U2-U1)/(I1-I2)。
2. Vehicular battery internal resistance measurement method as described in claim 1, which is characterized in that second moment is default acquisition
At the time of condition is triggered, the default acquisition condition includes:
The output voltage values of the battery unit for vehicles to be measured change；
Or,
The output current value of the battery unit for vehicles to be measured changes；
Or,
The prefixed time interval that timing finishing is acquired since first moment reaches, and the battery unit for vehicles to be measured
Output current value and/or output voltage values change.
3. Vehicular battery internal resistance measurement method as claimed in claim 2, which is characterized in that described to be measured in the acquisition of the second moment
Second output voltage values U of battery unit for vehicles2And corresponding second output current value I2Later further include:
Whether the default acquisition condition is again triggered within a preset period of time for judgement；
When the judgment result is yes, each triggering moment in the preset time period acquires the Vehicular battery to be measured respectively
The output voltage values of unit and corresponding output current value；
According to the output voltage values and corresponding output current value of battery unit for vehicles to be measured described under each adjacent triggering moment, divide
The battery unit for vehicles to be measured internal resistance value respectively corresponding under each adjacent triggering moment period is not calculated.
4. Vehicular battery internal resistance measurement method as described in any one of claims 1-3, which is characterized in that the vehicle electric to be measured
The quantity of pool unit is more than or equal to 2, and battery unit for vehicles to be measured described at least two is serially connected composition series-connected cell group, institute
It states the output voltage values for acquiring battery unit for vehicles to be measured and corresponding output current value includes:
The output at each battery unit for vehicles both ends to be measured in the series-connected cell group is acquired by a voltage modulus collector
Voltage value, and pass through the corresponding output current value of series-connected cell group described in an electric current modulus collector synchronous acquisition；
Or,
Each battery unit for vehicles both ends to be measured in the series-connected cell group are acquired by a voltage and current modulus collector
Output voltage values, and the corresponding output current value of the series-connected cell group is acquired by the voltage and current modulus collector；
Or,
Each battery unit for vehicles both ends to be measured in the series-connected cell group are acquired respectively by different voltage modulus collectors
Output voltage values, the quantity of the voltage modulus collector is equal to the number of battery unit for vehicles to be measured in the series-connected cell group
Amount, and pass through the corresponding output current value of series-connected cell group described in an electric current modulus collector synchronous acquisition.
5. Vehicular battery internal resistance measurement method as described in any one of claims 1-3, which is characterized in that the vehicle electric to be measured
The quantity of pool unit is more than or equal to 2, and battery unit for vehicles composition batteries in parallel connection group parallel with one another to be measured described at least two, institute
It states the output voltage values for acquiring battery unit for vehicles to be measured and corresponding output current value includes:
The output electric current of each battery unit for vehicles to be measured in the batteries in parallel connection group is acquired by an electric current modulus collector
Value, and pass through the corresponding output voltage values of batteries in parallel connection group described in a voltage modulus collector synchronous acquisition；
Or,
The output of each battery unit for vehicles to be measured in the batteries in parallel connection group is acquired by a voltage and current modulus collector
Current value, and the corresponding output voltage values of the batteries in parallel connection group are acquired by the voltage and current modulus collector；
Or,
The defeated of each battery unit for vehicles to be measured in the batteries in parallel connection group is acquired respectively by different electric current modulus collectors
Current value out, the quantity of the electric current modulus collector are equal to the quantity of battery unit for vehicles to be measured in the batteries in parallel connection group,
And pass through the corresponding output voltage values of batteries in parallel connection group described in a voltage modulus collector synchronous acquisition.
6. a kind of Vehicular battery internal resistance measurement device characterized by comprising
Acquisition module, for acquiring the first output voltage values U of battery unit for vehicles to be measured at the first moment1And corresponding
One output current value I1, and acquire at the second moment the second output voltage values U of battery unit for vehicles to be measured2And corresponding
Two output current value I2；
Computing module, for being calculated by the following formula to obtain the battery unit for vehicles to be measured at first moment to described
Internal resistance value R in second time section1:
R1=(U2-U1)/(I1-I2)。
7. Vehicular battery internal resistance measurement device as claimed in claim 6, which is characterized in that the acquisition module is used for described
The second output voltage values U is carried out when the output voltage values of battery unit for vehicles to be measured change2And corresponding second output
Current value I2Acquisition；Or for carrying out the second output when the output current value of the battery unit for vehicles to be measured changes
Voltage value U2And corresponding second output current value I2Acquisition；Or based on since first moment, being finished acquisition
When prefixed time interval reach, and the output current value of the battery unit for vehicles to be measured and/or output voltage values become
When change, the second output voltage values U is carried out2And corresponding second output current value I2Acquisition.
8. Vehicular battery internal resistance measurement device as claimed in claim 7, which is characterized in that the acquisition module is used for second
Moment acquires the second output voltage values U of the battery unit for vehicles to be measured2And corresponding second output current value I2Later,
When determining that the default acquisition condition described within a preset period of time is again triggered, acquired respectively in each triggering moment described to be measured
The output voltage values of battery unit for vehicles and corresponding output current value；The computing module is used for according to each adjacent triggering moment
Under the battery unit for vehicles to be measured output voltage values and corresponding output current value, calculate separately the Vehicular battery to be measured
Unit internal resistance value respectively corresponding under each adjacent triggering moment period.
9. such as the described in any item Vehicular battery internal resistance measurement devices of claim 6-8, which is characterized in that the vehicle electric to be measured
The quantity of pool unit is more than or equal to 2, and battery unit for vehicles to be measured described at least two is serially connected composition series-connected cell group；
The acquisition module includes a voltage modulus collector and an electric current modulus collector；The voltage modulus collector
For acquiring the output voltage values at each battery unit for vehicles both ends to be measured in the series-connected cell group, the electric current modulus acquisition
Device is for the corresponding output current value of series-connected cell group described in synchronous acquisition；
Or,
The acquisition module includes a voltage and current modulus collector, and the voltage and current modulus collector is described for acquiring
The output voltage values at each battery unit for vehicles both ends to be measured in series-connected cell group, and it is corresponding defeated to acquire the series-connected cell group
Current value out；
Or,
The acquisition module includes voltage modulus collector and an electric current modulus collector, the number of the voltage modulus collector
Amount is equal to the quantity of battery unit for vehicles to be measured in the series-connected cell group, and the voltage modulus collector is for acquiring the string
Join the output voltage values at corresponding battery unit for vehicles both ends to be measured in battery pack, the electric current modulus collector is for same
Step acquires the corresponding output current value of the series-connected cell group.
10. such as the described in any item Vehicular battery internal resistance measurement devices of claim 6-8, which is characterized in that described to be measured automobile-used
The quantity of battery unit is more than or equal to 2, and battery unit for vehicles composition batteries in parallel connection group parallel with one another to be measured described at least two；
The acquisition module includes an electric current modulus collector and a voltage modulus collector；The electric current modulus collector
For acquiring the output current value of each battery unit for vehicles to be measured in the batteries in parallel connection group, the voltage modulus collector is used
The corresponding output voltage values of batteries in parallel connection group described in synchronous acquisition；
Or,
The acquisition module includes a voltage and current modulus collector, and the voltage and current modulus collector is described for acquiring
The output current value of each battery unit for vehicles to be measured in batteries in parallel connection group, and acquire the corresponding output electricity of the batteries in parallel connection group
Pressure value；
Or,
The acquisition module includes electric current modulus collector and a voltage modulus collector, the number of the electric current modulus collector
Quantity of the amount equal to battery unit for vehicles to be measured in the batteries in parallel connection group, the electric current modulus collector acquisition electricity in parallel
The output current value of corresponding battery unit for vehicles to be measured in the group of pond, the voltage modulus collector are used for synchronous acquisition institute
State the corresponding output voltage values of batteries in parallel connection group.
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| CN111722136A (en) * | 2020-06-12 | 2020-09-29 | 杭州元朗智能科技有限公司 | Internal resistance tester for storage battery |
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| CN114509694A (en) * | 2022-02-19 | 2022-05-17 | 武汉新能纪元技术有限公司 | A method for estimating internal resistance of large lithium battery |
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