CN108254700A - Battery DC internal resistance measuring method - Google Patents
Battery DC internal resistance measuring method Download PDFInfo
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- CN108254700A CN108254700A CN201810085261.6A CN201810085261A CN108254700A CN 108254700 A CN108254700 A CN 108254700A CN 201810085261 A CN201810085261 A CN 201810085261A CN 108254700 A CN108254700 A CN 108254700A
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- internal resistance
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
Abstract
A kind of battery DC internal resistance measuring method, includes the following steps：10. detect the current variation value Δ I of present batterynMore than rated current changing value I0；20. in predetermined time T, the electric current of battery and voltage w times are detected, calculates the average value of each curent changeWith the average value of voltage change；30. calculate battery DC internal resistance DCIR using equation belown,；40. repeating the above steps 10 to 30, several battery DC internal resistance DCIR are obtained1......DCIRn, by DCIR1......DCIRnIt is arranged according to value size order, chooses value and be arranged in intermediate DCIRmAs present battery DC internal resistance.The present invention passes through in predetermined time T, electric current and the voltage for detecting battery are multiple, calculate the average value of each curent change and the average value of voltage change, from which further follow that the battery DC internal resistance in predetermined time T, several battery DC internal resistances will be obtained to arrange according to value size order, it chooses value and is arranged in intermediate battery DC internal resistance as present battery DC internal resistance, have many advantages, such as that error is small, measuring and calculating is accurate and measuring and calculating is efficient.
Description
Technical field
The present invention relates to internal resistance of cell computing technique field, more particularly, to a kind of battery DC internal resistance measuring method.
Background technology
Existing inner walkway is all the internal resistance of the exchange of test, and the healthy shape of battery is judged according to the internal resistance of exchange
State；Can each test be required for test equipment, can just measure the AC internal Resistance of battery；And with the increasing of cycle-index
Add, the variation range of AC internal Resistance is simultaneously little, therefore judges that the comparison that the health status of battery is just shown is single with AC internal Resistance merely
One.
For this purpose, people have invented the DC internal resistance by obtaining battery, to judge the health status of battery, so as to further
Judge the battery pack whether the method that can be continuing with.As patent No. CN201110393460.1 announces a kind of acquisition battery pack
The algorithm of DC internal resistance, patent are to take certain time cycle T, acquire cell voltage maximum value Umax and voltage in the cycle T
Minimum value Umin acquires battery current maximum value Imax and electric current minimum Imin in the cycle T, electricity is calculated using equation below
Pond group D.C. resistance R, R=(Umax-Umin)/(Imax-Imin).
But the patent can there are other defects：1. the certain time interval T taken, when within T this periods, battery pack is without electricity
The variation of current voltage, then Umax=Umin, Imax=Imin, at this time if also calculated according to the patent, error compared with
Greatly, and its value is not also right.2. because the load of battery pack is dynamic, i.e. Imax and Imin are variations, at the same Umax and
Umin is also variation, and bigger mistake individually at this time will be brought to the DC internal resistance of battery pack using Imax-Imin
Difference.Such as：Whithin a period of time, the load current of battery is to change to 10A from 1A, and stepping hypothesis is 1A, then Imax=at this time
When 10A, Umin=Vmin, i.e. electric current maximum, voltage is minimum；Imin=1A, Umax=Vmax, when electric current minimum,
Voltage is maximum.Therefore according to the patent, within this period of T, obtained internal resistance value is
R=(Umax-Umin)/(Imax-Imin)=(Umax1-Umin1)/(10-1)=(Umax-Umin)/9, this is specially
Profit is suitable for the load of test constant current；It, then can there are bigger errors once load is dynamic.3. it is obtaining directly simultaneously
After leakage resistance R, the R processing to getting, application condition be not big yet for software.
Invention content
In order to overcome the above problem, a kind of error of present invention offer is small and calculates accurate battery DC internal resistance measuring and calculating side
Method.
The technical scheme is that：A kind of battery DC internal resistance measuring method is provided, is included the following steps：
10. detect the current variation value Δ I of present batterynMore than rated current changing value I0, n is the integer more than 1；
20. in predetermined time T, the electric current of battery and voltage w times are detected, calculates the average value of each curent change
With the average value of voltage changeW is the integer more than 1；
30. calculate battery DC internal resistance DCIR using equation belown,
40. repeating the above steps 10 to 30, several battery DC internal resistance DCIR are obtained1......DCIRn, will
DCIR1......DCIRnIt is arranged according to value size order, chooses value and be arranged in intermediate DCIRmAs present battery direct current
Internal resistance, m≤n, m are the integer more than or equal to 1.
As improvement of the present invention, before above-mentioned steps 10 are performed, step 9 is further included, obtains the electric current of present battery
Inow, by electric current InowWith currently stored electric current IbeforeIt is compared, obtains Δ In=Inow-Ibefore。
As improvement of the present invention, in above-mentioned steps 10, as the current variation value Δ I for detecting present batterynIt is small
In equal to rated current changing value I0When, repeat the above steps 9.
As improvement of the present invention, in above-mentioned steps 20, as current variation value Δ InMore than rated current changing value ID
When, timer initiation timing predetermined time T in predetermined time T, detects electric current w times of battery, and calculate and become per primary current
The average value of change ItIt is battery when timing starts
Current value, ImwIt is electric current w times that battery is detected in n-th timing predetermined time T, the current value of the battery of the w times.
As improvement of the present invention, in above-mentioned steps 20, as current variation value Δ InMore than rated current changing value ID
When, timer initiation timing predetermined time T in predetermined time T, detects voltage w times of battery, and calculates each voltage and become
The average value of change UtWhen being that timing starts
The voltage value of battery, UnwIt is voltage w times that battery is detected in n-th timing predetermined time T, the voltage of the battery of the w times
Value.
As improvement of the present invention, in above-mentioned steps 40, by DCIR1......DCIRnAccording to value from big to small or
It is ranked sequentially from small to large.
As improvement of the present invention, when n is odd number, chooses value and be arranged in intermediate DCIRmAs present battery
DC internal resistance.
As improvement of the present invention, when n is even number, the value there are two battery DC internal resistance is arranged in centre,
One of value DCIR is arbitrarily chosen in the two valuesmAs present battery DC internal resistance.
The present invention is multiple by electric current and the voltage in predetermined time T, detecting battery, calculates the flat of each curent change
The average value of mean value and voltage change from which further follows that the battery DC internal resistance in predetermined time T, it is straight will to obtain several batteries
It flows internal resistance to arrange according to value size order, chooses value and be arranged in intermediate battery DC internal resistance as in present battery direct current
Resistance, even if load is dynamic change, the error for calculating the result come is also smaller, with error is small, measuring and calculating is accurate and surveys
Calculate the advantages that efficient.
Description of the drawings
Fig. 1 is the flow principle schematic of the present invention.
Specific embodiment
In the description of the present invention, it is to be understood that " " center ", " on " in term, " under ", "front", "rear", " left side ",
The orientation or position relationship of instructions such as " right sides " are based on orientation shown in the drawings or position relationship, are for only for ease of and describe this hair
It is bright to have specific orientation, with the device for simplifying description rather than instruction or hint meaning or component with specific orientation
Construction and operation, therefore be not considered as limiting the invention.In addition, term " first ", " second " are only used for description purpose,
And it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation " " connects
Connect ", " connected " should be interpreted broadly, for example, it may be being fixedly connected or dismantling connection or being integrally connected；It can be with
It is mechanical connection or electrical connection；It can be directly connected or be indirectly connected by intermediary, Ke Yishi
The connection of two component internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
The concrete meaning of invention.
Fig. 1 is referred to, Fig. 1 revealed is a kind of battery DC internal resistance measuring method, is included the following steps：
10. detect the current variation value Δ I of present batterynMore than rated current changing value I0, n is the integer more than 1；
20. in predetermined time T, the electric current of battery and voltage w times are detected, calculates the average value of each curent change
With the average value of voltage changeW is the integer more than 1；
30. calculate battery DC internal resistance DCIR using equation belown,
40. repeating the above steps 10 to 30, several battery DC internal resistance DCIR are obtained1......DCIRn, will
DCIR1......DCIRnIt is arranged according to value size order, chooses value and be arranged in intermediate DCIRmAs present battery direct current
Internal resistance, m≤n, m are the integer more than or equal to 1.
In the method, before above-mentioned steps 10 are performed, step 9 is further included, obtains the electric current I of present batterynow, will be electric
Flow InowWith currently stored electric current IbeforeIt is compared, obtains Δ In=Inow-Ibefore。
In the above-mentioned steps 10 of this method, as the current variation value Δ I for detecting present batterynLess than or equal to specified electricity
Flow changing value I0When, repeat the above steps 9.ΔInLess than or equal to I0, it is believed that the curent change very little of present battery, it can be with
It ignores, it is impossible to perform step 10, need to repeat the above steps 9.Repeat the above steps 9 when, it is current when detecting
The current variation value Δ I of batterynMore than rated current changing value I0When, it is believed that the curent change of present battery is very big, performs
Following step 20.It should be noted that I0Value range more than or equal to 80mA to less than or equal between 150mA, I0Can be
80mA, 90mA, 100mA, 110mA, 120mA, 130mA, 140mA or 150mA, I0Value range can according to actual needs into
Row selection, it is not limited to above range.
In the above-mentioned steps 20 of this method, timing predetermined time T, the value range of predetermined time T may be greater than
In 5S to less than or equal between 30S, predetermined time T can be 5S, 10S, 15S, 20S, 25S or 30S, the value of predetermined time T
Range can be selected according to actual needs, it is not limited to above range.
In the above-mentioned steps 20 of this method, as current variation value Δ InMore than rated current changing value I0When, timer opens
Dynamic timing predetermined time T in predetermined time T, detects electric current w times of battery, and calculates the average value of each curent change ItIt is the current value of battery when timing starts, Inw
It is electric current w times that battery is detected in n-th timing predetermined time T, the current value of the battery of the w times.That is, pre-
It fixes time in T, detects electric current w times of battery, the w primary current values detected are added up, then subtract w It, just obtain w electricity
The total amount of rheology, the total amount then changed divided by w times just obtain the average value of each curent change
For example, ItFor 1A, the electric current 5 times of battery, I are detectedn1For 1.2A, In2For 1.6A, In2For 2.0A, In4For 2.2A, In5
For 2.4A, according to formula, Also
It is to say, the average value of each curent change is 0.88A.Above-mentioned data are merely illustrative, and the present invention is not limited thereto.
N is the integer more than 1,Mean the average value of each curent change in timing first time, T predetermined time,Mean the average value of each curent change in second of timing predetermined time T,Mean that third time timing is pre-
It fixes time in T the average value of curent change every time,Mean each curent change in the 4th timing predetermined time T
Average value ...Mean the average value of each curent change in n-th timing predetermined time T.
In the above-mentioned steps 20 of this method, as current variation value Δ InMore than rated current changing value I0When, timer opens
Dynamic timing predetermined time T in predetermined time T, detects voltage w times of battery, and calculates the average value of each voltage change UtIt is the voltage of battery when timing starts
Value, UnwIt is voltage w times that battery is detected in n-th timing predetermined time T, the voltage value of the battery of the w times.That is,
In predetermined time T, voltage w times of battery is detected, the w voltage value detected is added up, then subtract w Ut, just obtain w
The total amount of secondary voltage change, the total amount then changed divided by w times just obtain the average value of each voltage change
For example, UtFor 1V, the voltage 5 times of battery, U are detectedn1For 2.2V, Un2For 2.6V, Un3For 3.0V, Un4For 3.2V, Un5
For 3.4V, according to formula,
That is, the average value of voltage change is 1.88V every time.Above-mentioned data are merely illustrative, and the present invention is not limited thereto.
N is the integer more than 1,Mean the average value of each voltage change in timing first time, T predetermined time,Mean the average value of each voltage change in second of timing predetermined time T,Mean third time timing
The average value of each voltage change in predetermined time T,Mean each voltage change in the 4th timing predetermined time T
Average value ...Mean the average value of each voltage change in n-th timing predetermined time T.
In the above-mentioned steps 30 of this method, battery DC internal resistance DCIR is calculated using equation belown,For example,Then DCIRn=2.14 Ω.
In the above-mentioned steps 40 of this method, 10 to 30 are repeated the above steps, obtain several battery DC internal resistances
DCIR1......DCIRn.It should be noted that repeating the above steps during 10 to 30, step 9 is further included, is surveyed every time
Calculate battery DC internal resistance DCIRnWhen, it is required for detecting the current variation value Δ I of present batterynWhether it is more than rated current to change
Value I0, only detect the current variation value Δ I of present batterynMore than rated current changing value I0When, timer just starts.N is
Integer more than 1,DCIR1Mean the battery DC internal resistance measured for the first time；DCIR2Mean the battery DC internal resistance measured for the second time；
DCIR3Mean the battery DC internal resistance that third time is measured；DCIR4Mean the 4th survey
The battery DC internal resistance ... gone outDCIRnMean the battery DC internal resistance that n-th is measured.
In the above-mentioned steps 40 of this method, by DCIR1......DCIRnIt is from big to small or suitable from small to large according to value
Sequence arranges.When n is odd number, chooses value and be arranged in intermediate DCIRmAs present battery DC internal resistance, m≤n, m be more than
Integer equal to 1.For example, n is 5, indicates 5 battery DC internal resistances, that is, surveyed 5 primary cell DC internal resistances, it will
DCIR1......DCIR5It is ranked sequentially from big to small or from small to large according to value, chooses value and be arranged on the position of third
DCIRmAs present battery DC internal resistance, DCIRmCan be DCIR1......DCIR5In any one value.
When n is even number, the value there are two battery DC internal resistance is arranged in centre, is arbitrarily chosen in the two values
One of value DCIRmAs present battery DC internal resistance, m≤n, m are the integer more than or equal to 1.For example, n is 6,6 are indicated
A battery DC internal resistance has surveyed 6 primary cell DC internal resistances, by DCIR1......DCIR6According to value from big to small or from small
It to being ranked sequentially greatly, is arranged on third and fourth position there are one battery DC internal resistance respectively, can choose and be arranged in the
DCIR on three positionmAs present battery DC internal resistance or the DCIR being arranged on the 4th position can be chosenmMake
For present battery DC internal resistance, DCIRmCan be DCIR1......DCIR6In any one value.
The present invention is multiple by electric current and the voltage in predetermined time T, detecting battery, calculates the flat of each curent change
The average value of mean value and voltage change from which further follows that the battery DC internal resistance in predetermined time T, it is straight will to obtain several batteries
It flows internal resistance to arrange according to value size order, chooses value and be arranged in intermediate battery DC internal resistance as in present battery direct current
Resistance, even if load is dynamic change, the error for calculating the result come is also smaller, with error is small, measuring and calculating is accurate and surveys
Calculate the advantages that efficient.
It should be noted that explaining in detail for the respective embodiments described above, purpose, which is only that, solves the present invention
Release, in order to be able to preferably explain the present invention, still, these description cannot with any explanation into be to the present invention limit
System, particularly, each feature described in various embodiments mutually can also be combined arbitrarily, so as to form other implementations
Mode, in addition to there is clearly opposite description, these features should be understood to can be applied in any one embodiment, and simultaneously
It is not only limited to described embodiment.
Claims (8)
1. a kind of battery DC internal resistance measuring method, which is characterized in that include the following steps：
10. detect the current variation value Δ I of present batterynMore than rated current changing value I0, n is the integer more than 1；
20. in predetermined time T, the electric current of battery and voltage w times are detected, calculates the average value of each curent changeAnd electricity
The average value of bucklingW is the integer more than 1；
30. calculate battery DC internal resistance DCIR using equation belown,
40. repeating the above steps 10 to 30, several battery DC internal resistance DCIR are obtained1……DCIRn, by DCIR1……DCIRnIt presses
It is arranged according to value size order, chooses value and be arranged in intermediate DCIRmAs present battery DC internal resistance, m≤n, m be more than
Integer equal to 1.
2. battery DC internal resistance measuring method according to claim 1, it is characterised in that：Before above-mentioned steps 10 are performed,
Step 9 is further included, obtains the electric current I of present batterynow, by electric current InowWith currently stored electric current IbeforeIt is compared, obtains
ΔIn=Inow-Ibefore。
3. battery DC internal resistance measuring method according to claim 2, it is characterised in that：In above-mentioned steps 10, work as inspection
Measure the current variation value Δ I of present batterynLess than or equal to rated current changing value I0When, repeat the above steps 9.
4. battery DC internal resistance measuring method according to claim 1 or 2, it is characterised in that：In above-mentioned steps 20, when
Current variation value Δ InMore than rated current changing value I0When, timer initiation timing predetermined time T, in predetermined time T, inspection
The electric current of survey battery w times, and calculate the average value of each curent change ItIt is the current value of battery when timing starts, InwIt is in n-th timing predetermined time T
It is interior, detect electric current w times of battery, the current value of the battery of the w times.
5. battery DC internal resistance measuring method according to claim 1 or 2, it is characterised in that：In above-mentioned steps 20, when
Current variation value Δ InMore than rated current changing value I0When, timer initiation timing predetermined time T, in predetermined time T, inspection
The voltage of survey battery w times, and calculate the average value of each voltage change UtIt is the voltage value of battery when timing starts, UnwIt is in n-th timing predetermined time T
It is interior, detect voltage w times of battery, the voltage value of the battery of the w times.
6. battery DC internal resistance measuring method according to claim 1 or 2, it is characterised in that：It, will in above-mentioned steps 40
DCIR1……DCIRnIt is ranked sequentially from big to small or from small to large according to value.
7. battery DC internal resistance measuring method according to claim 1 or 2, it is characterised in that：When n is odd number, choose
Value is arranged in intermediate DCIRmAs present battery DC internal resistance.
8. battery DC internal resistance measuring method according to claim 1 or 2, it is characterised in that：When n is even number, there is two
The value of a battery DC internal resistance is arranged in centre, and one of value DCIR is arbitrarily chosen in the two valuesmAs current
Battery DC internal resistance.
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|---|---|---|---|
| CN201810085261.6A CN108254700A (en) | 2018-01-29 | 2018-01-29 | Battery DC internal resistance measuring method |
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|---|---|---|---|
| CN201810085261.6A CN108254700A (en) | 2018-01-29 | 2018-01-29 | Battery DC internal resistance measuring method |
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ID=62743071
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613442A (en) * | 2018-12-27 | 2019-04-12 | 东莞钜威动力技术有限公司 | Internal resistance of cell Dynamic calculation method and battery management system |
| CN109946613A (en) * | 2019-04-08 | 2019-06-28 | 上海理工大学 | The internal resistance On-line Estimation and life detecting method of Vehicular dynamic battery |
| CN110007243A (en) * | 2019-04-10 | 2019-07-12 | 上海微小卫星工程中心 | A method of the on-orbit performance decaying of monitoring spacecraft battery |
| CN110221223A (en) * | 2019-05-08 | 2019-09-10 | 昆山正金软件科技有限公司 | A kind of estimation on line method of lithium ion battery SOH |
| CN110554329A (en) * | 2019-10-17 | 2019-12-10 | 东软睿驰汽车技术（沈阳）有限公司 | battery internal resistance measuring method and device |
| CN115144778A (en) * | 2022-09-02 | 2022-10-04 | 力高(山东)新能源技术有限公司 | Method for estimating internal resistance of battery by big data |
| CN116718937A (en) * | 2023-06-30 | 2023-09-08 | 惠州亿纬锂能股份有限公司 | Internal resistance estimation method, battery management system, and computer-readable medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613442A (en) * | 2018-12-27 | 2019-04-12 | 东莞钜威动力技术有限公司 | Internal resistance of cell Dynamic calculation method and battery management system |
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| CN109946613A (en) * | 2019-04-08 | 2019-06-28 | 上海理工大学 | The internal resistance On-line Estimation and life detecting method of Vehicular dynamic battery |
| CN110007243A (en) * | 2019-04-10 | 2019-07-12 | 上海微小卫星工程中心 | A method of the on-orbit performance decaying of monitoring spacecraft battery |
| CN110007243B (en) * | 2019-04-10 | 2021-06-29 | 上海微小卫星工程中心 | Method for monitoring on-orbit performance attenuation of spacecraft storage battery |
| CN110221223A (en) * | 2019-05-08 | 2019-09-10 | 昆山正金软件科技有限公司 | A kind of estimation on line method of lithium ion battery SOH |
| CN110554329A (en) * | 2019-10-17 | 2019-12-10 | 东软睿驰汽车技术（沈阳）有限公司 | battery internal resistance measuring method and device |
| CN115144778A (en) * | 2022-09-02 | 2022-10-04 | 力高(山东)新能源技术有限公司 | Method for estimating internal resistance of battery by big data |
| CN116718937A (en) * | 2023-06-30 | 2023-09-08 | 惠州亿纬锂能股份有限公司 | Internal resistance estimation method, battery management system, and computer-readable medium |
| CN116718937B (en) * | 2023-06-30 | 2024-04-02 | 惠州亿纬锂能股份有限公司 | Internal resistance estimation method, battery management system, and computer-readable medium |
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