CN106970333A - The method and device of internal resistance of cell detection - Google Patents
The method and device of internal resistance of cell detection Download PDFInfo
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- CN106970333A CN106970333A CN201710312178.3A CN201710312178A CN106970333A CN 106970333 A CN106970333 A CN 106970333A CN 201710312178 A CN201710312178 A CN 201710312178A CN 106970333 A CN106970333 A CN 106970333A
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- battery
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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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Abstract
The present invention relates to battery detecting field, a kind of internal resistance of cell detection method is disclosed, it is characterised in that including：It is in battery under charged state, measures the battery voltage value U1With charging current I；The charged state of battery is switched into off-state, and measures the magnitude of voltage U for disconnecting battery after charging2；And according to the magnitude of voltage U1With the magnitude of voltage U2Difference and the charging current I, determine the internal resistance value R of the batteryn。
Description
Technical field
The present invention relates to battery detecting field, the method and device detected more particularly to a kind of internal resistance of cell.
Background technology
Internal resistance is an important parameter of lithium battery, and it directly decides the available horsepower of lithium battery group, to electric automobile
Dynamic property generation influence, while internal resistance also reflects the health status (State-of-Health, SOH) of lithium battery, with
Compared when battery just dispatches from the factory, with the increase of the cycle-index of battery, due to inside battery chemical substance activity reduction and
The aging of electrode material, can cause the internal resistance of cell gradually to increase, therefore, be also estimation lithium battery health using internal resistance situation of change
One of mode of state.
Because the internal resistance of lithium battery is smaller and change slow, and battery management system (battery management
System, BMS) to battery terminal voltage and current measurement when latency issue cause the on-line measurement internal resistance of cell often cause compared with
Big error, if therefore for the internal resistance of cell measure using off-line measurement also result in the offline internal resistance of cell value that measures for
The estimation of cell health state is infeasible.
The content of the invention
The invention aims to overcome prior art exist to battery terminal voltage and current measurement when delay ask
Topic cause a kind of method that the problem of on-line measurement internal resistance of cell often causes larger error detect there is provided internal resistance of cell and
Device, this method is by detecting the magnitude of voltage U under battery charging state1With the magnitude of voltage U after disconnection charging2With charging current I,
And the detection time of battery terminal voltage has been elongated, i.e., has set two time point t respectively1And t2Battery charging state is detected respectively
Under magnitude of voltage U1With the magnitude of voltage U after disconnection charging2, setting time Δ t is spaced between described two time points, for waiting
Battery terminal voltage is steady, and carries out above-mentioned detection at the temperature and battery charging state of setting, according to the magnitude of voltage U1
With the magnitude of voltage U2Difference and the charging current I, determine the internal resistance value R of the batteryn, can also be by the internal resistance value
RnWith the internal resistance value R of last timen-1It is compared, in the case where relatively difference is not more than preset difference value, by internal resistance value RnIt is updated to
The internal resistance value of the battery；The device by detection unit and control unit by the above method complete the internal resistance of cell detection and
Update action.
To achieve these goals, one aspect of the present invention provides a kind of internal resistance of cell detection method, it is characterised in that bag
Include：It is in battery under charged state, measures the battery voltage value U1With charging current I；The charged state of battery is switched
For off-state, and measure the magnitude of voltage U for disconnecting battery after charging2；And according to the magnitude of voltage U1With the magnitude of voltage U2It
Poor and described charging current I, determines the internal resistance value R of the batteryn。
Preferably, the SOC state value scopes during internal resistance detection of the battery are：30%≤SOC≤90%.
Preferably, the scope of the battery temperature T during internal resistance detection of the battery is：22℃≤T≤ 28℃.
Preferably, the magnitude of voltage U1Detection time point be t1, the magnitude of voltage U2Detection time point be t2, it is described
The power-off time of battery is=t2-t1, and the 5s≤Δ t≤10s.
Preferably, this method also includes：By the internal resistance value RnWith the internal resistance value R of last timen-1It is compared, poor
In the case that value is not more than preset difference value, by internal resistance value RnIt is updated to the internal resistance value of the battery.
Second aspect of the present invention provides a kind of internal resistance of cell detection means, it is characterised in that including：Detection unit, is used for
Detect that the battery disconnects the magnitude of voltage U before charging1With the magnitude of voltage U of the battery after charging current value I, and disconnection charging2；
And control unit, for the data for controlling the start and stop of the charhing unit, being detected according to the detection unit, it is determined that described
The internal resistance value R of batteryn。
Preferably, the detection unit is additionally operable to detect the SOC state values and temperature value of the battery；Wherein, the electricity
SOC state value scopes during the internal resistance detection in pond are：30%≤SOC≤90%；Battery temperature during the internal resistance detection of the battery
Degree T scope be：22℃≤T≤28℃.
Preferably, described control unit is additionally operable to set the detection time of the detection unit；Wherein, the magnitude of voltage U1
Detection time point be t1, the magnitude of voltage U2Detection time point be t2, the power-off time of the battery is Δ t=t2-t1, and
The 5s≤Δ t≤10s.
Preferably, described control unit is additionally operable to set preset difference value, by the internal resistance value RnWith the internal resistance value R of last timen-1
It is compared, in the case where relatively difference is not more than preset difference value, by internal resistance value RnIt is updated to the internal resistance value of the battery
Pass through above-mentioned technical proposal, the magnitude of voltage U of detection battery in the charge state1Filled with charging current I and disconnection
The magnitude of voltage U of battery after electricity2, pass through the magnitude of voltage U detected1With the magnitude of voltage U2Difference and the charging current
I, and then determine the internal resistance value R of the batteryn, it is to avoid the battery that the magnitude of voltage of on-line measurement battery is calculated with charging current
The problem of larger error occurs in internal resistance value, the internal resistance value of battery can accurately be determined by realizing, and be that battery subsequently uses planning
There is provided important reference information.
Brief description of the drawings
Fig. 1 is a kind of basic step schematic diagram of internal resistance of cell detection method provided in an embodiment of the present invention；
Fig. 2 is a kind of entire protocol schematic diagram of internal resistance of cell detection method provided in an embodiment of the present invention；
Fig. 3 is that a kind of internal resistance of internal resistance of cell detection method provided in an embodiment of the present invention updates step schematic diagram；
A kind of detection time point of Fig. 4 internal resistance of cell detection methods provided in an embodiment of the present invention is linearly closed with Current Voltage
It is schematic diagram；
A kind of Fig. 5 structural representations of internal resistance of cell detection means provided in an embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
In the present invention, in the case where not making opposite explanation, the noun of locality used such as " upper and lower, left and right ", " interior,
Outside ", " remote, near " refers to the direction of refer to the attached drawing, therefore, and use direction term is to limit the present invention for illustrating not.
Fig. 1 show be a kind of internal resistance of cell detection method provided in an embodiment of the present invention basic step schematic diagram, such as
Shown in Fig. 1, this method can include：It is in battery under charged state, measures the battery voltage value U1With charging current I；
The charged state of battery is switched into off-state, and measures the magnitude of voltage U for disconnecting battery after charging2；And according to the electricity
Pressure value U1With the magnitude of voltage U2Difference and the charging current I, determine the internal resistance value R of the batteryn；Wherein, the battery with
I electric currents are charged, and the voltage and charging current of the battery are measured before power-off, measure voltage for U1, charging current
For I, magnitude of voltage U is completed1After measurement with charging current I, charged state switching is carried out, battery is switched to by charged state
Charged state is disconnected, the battery after charging is disconnected, its battery terminal voltage, which can be produced, drastically to be declined, the battery electricity after measurement decline
Press U2, and by magnitude of voltage U1With magnitude of voltage U2It is poor to make, and obtained difference DELTA U and the charging current I of measurement are divided by, the electricity is determined
The internal resistance value R in pondn；Formula can be passed throughCalculate the internal resistance value R for determining the batteryn；Such scheme can be kept away
The problem of there is larger error in the internal resistance of cell value that the magnitude of voltage and charging current for exempting from on-line measurement battery are calculated, it is possible to real
Accurate internal resistance of cell value is now obtained by above-mentioned calculation.
Fig. 2 shows a kind of entire protocol schematic diagram of internal resistance of cell detection method provided in an embodiment of the present invention, such as Fig. 2
Shown, this method can also include：Before measuring by judging the following status information of battery, and meet in all characteristic informations
It is required that in the case of carry out the detection operation of next step, the status information of the battery can include：Whether battery is in charging
The SOC state values whether state, battery meet battery in the case of under charged state are in 30%≤SOC≤90%
Condition and battery be in charged state under and battery SOC state values be in 30%≤SOC≤90% in the case of whether
The scope for meeting the temperature T of battery is：The condition of 22 DEG C≤T≤28 DEG C, starts to battery in the case where meeting above-mentioned condition
Detected, restart the judgement of battery status information if thering is one to be unsatisfactory in above-mentioned condition until meeting all conditions
After start to detect battery；Wherein, it is desirable to meet above-mentioned SOC state values condition and battery temperature value condition, so that should
The detection of internal resistance of cell value is more accurate；Specifically, the SOC state values size of battery influences the change of the internal resistance of cell, and in electricity
In the case of SOC state value 30%≤SOC≤90% in pond, the internal resistance of cell is stablized the most, therefore the SOC state values of setting battery
The detection of internal resistance of cell resistance is carried out in the case of 30%≤SOC≤90%；The temperature value T of battery is equally influenceed in battery
The change of resistance, in the case where battery temperature T is in 22 DEG C≤T≤28 DEG C, the internal resistance of cell is stablized the most, therefore setting battery
Temperature value T carries out the detection of internal resistance of cell resistance in the case of being in 22 DEG C≤T≤28 DEG C.
Fig. 3 shows that a kind of internal resistance of internal resistance of cell detection method provided in an embodiment of the present invention updates step schematic diagram,
As shown in figure 3, this method is additionally included in calculates the internal resistance value R for determining battery by detectingnAfterwards, by the internal resistance value RnWith last time
Internal resistance value Rn-1It is compared, in the case where relatively difference is not more than preset difference value, by internal resistance value RnIt is updated to the battery
Internal resistance value, wherein, it is determined that the internal resistance value R of batterynAfterwards, it is the accuracy and reliability of guarantee data, by the electricity of this detection
Pond internal resistance value RnIt is compared with last internal resistance of cell value and makees poor, and the absolute value of difference is not more than preset difference value
In the case of, judge the internal resistance of cell value R that this detection is determinednEffectively, and by this detection the internal resistance of cell value R determinednIt is updated to
The internal resistance value of the battery, in the case where the absolute value of difference is more than preset difference value, judges the internal resistance of cell that this detection is determined
Value RnInvalid, internal resistance of cell value does not update, and continues the internal resistance of cell value using last time；Above-mentioned technical proposal can avoid battery
The problem of None- identified is found after error occurs in the detection of internal resistance and calculating process, group detection method in the battery is added
Reliability.
Fig. 4 shows the detection time point and Current Voltage line for a kind of internal resistance of cell detection method that inventive embodiments are provided
Sexual intercourse schematic diagram, as shown in figure 4, setting time point t can be distinguished in this method1And t2, wherein, in t1Time point detection electricity
The magnitude of voltage U of pond in the charge state1With charging current I, in t2Battery voltage value U after point in time measurement power-off2, and the time
Point t1And t2Between be spaced setting time Δ t, specifically, in t1Time point, magnitude of voltage U1Release is measured with charging current I
The battery is disconnected immediately afterwards and being charged, the magnitude of voltage of the battery can drastically decline, but be to wait for the voltage value stabilization of the battery also
Need a period of time, therefore battery magnitude of voltage U in the case where disconnecting charged state2Detection need to be carried out after setting time Δ t, setting
Fix time i.e. t after Δ t2Time point carries out battery battery voltage value U in the power-off state and in the case of voltage value stabilization2's
Detection, completes magnitude of voltage U2Detection after recover battery charging immediately, so far, the detection for completing cell voltage and electric current is moved
Make.Because the detection time of cell voltage and electric current is Millisecond, therefore the power-off time of the battery can be considered Δ t=t2-t1；
Δ t can be set as 5s≤Δ t≤10s, specifically, and battery disconnects 5s cell voltages after charging and tended towards stability, therefore in battery
Battery voltage value U can be carried out after disconnecting charging 5s2Detection, and due to battery disconnect the charging interval be more than 10s can because delay
It is long that error is produced to internal resistance of cell detection, therefore setting can carry out battery voltage value in battery disconnection charging 5s to 10s
U2Detection.For example, in t1The magnitude of voltage U of time point detection battery in the charge state1With charging current I, disconnect the battery and fill
Battery battery voltage value U in the power-off state and in the case of voltage value stabilization is carried out after electric 10s2Detection, immediately recover electricity
Charge in pond.It should be noted that the power-off time needs per primary cell are identical with the last time, it so can just ensure the internal resistance of cell
Value makees the accuracy of poor comparative result.
Fig. 5 shows a kind of structural representation for internal resistance of cell detection means that inventive embodiments are provided, as shown in figure 5,
The internal resistance of cell detection means can include：Detection unit, control unit；Wherein, detection unit be used for carry out battery voltage,
Electric current, temperature, the detection of SOC state values, the control unit are used for the data detected according to the detection unit, judge battery shape
State information meets testing conditions, and calculates in the case of eligible the internal resistance value of the battery, while by the electricity calculated
Pond internal resistance value makees poor with last internal resistance of cell value, in the case where the absolute value of the difference is not more than setting difference by this
The internal resistance of cell value of detection is updated to the internal resistance value of the battery, in the case where the absolute value of the difference is more than setting difference, electricity
Pond internal resistance value does not update, and continues the internal resistance value using last time.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited thereto.At this
In the range of the technology design of invention, a variety of simple variants, including each particular technique can be carried out to technical scheme
Feature is combined in any suitable manner.In order to avoid unnecessary repetition, the present invention is to various possible combinations
No longer separately illustrate.But these simple variants and combination should equally be considered as content disclosed in this invention, belong to the present invention
Protection domain.
Claims (9)
1. a kind of internal resistance of cell detection method, it is characterised in that including：
It is in battery under charged state, measures the battery voltage value U1With charging current I；
The charged state of battery is switched into off-state, and measures the magnitude of voltage U for disconnecting battery after charging2；And
According to the magnitude of voltage U1With the magnitude of voltage U2Difference and the charging current I, determine the internal resistance value of the battery
Rn。
2. according to the method described in claim 1, it is characterised in that the SOC state value scopes during internal resistance detection of the battery
For：30%≤SOC≤90%.
3. according to the method described in claim 1, it is characterised in that the model of the battery temperature T during internal resistance detection of the battery
Enclose for：22℃≤T≤28℃.
4. according to the method described in claim 1, it is characterised in that the magnitude of voltage U1Detection time point be t1, the voltage
Value U2Detection time point be t2, the power-off time of the battery is=t2-t1, and the 5s≤Δ t≤10s.
5. according to the method described in claim 1, it is characterised in that this method also includes：
By the internal resistance value RnWith the internal resistance value R of last timen-1It is compared, in the case where relatively difference is not more than preset difference value,
By internal resistance value RnIt is updated to the internal resistance value of the battery.
6. a kind of internal resistance of cell detection means, it is characterised in that including：
Detection unit, for detecting that the battery disconnects the magnitude of voltage U before charging1With institute after charging current value I, and disconnection charging
State the magnitude of voltage U of battery2；And
Control unit, for the data for controlling the start and stop of the charhing unit, being detected according to the detection unit, it is determined that described
The internal resistance value R of batteryn。
7. device according to claim 6, it is characterised in that the detection unit is additionally operable to detect the SOC of the battery
State value and temperature value；
Wherein, the SOC state value scopes during internal resistance detection of the battery are：30%≤SOC≤90%；
The scope of battery temperature T during the internal resistance detection of the battery is：22℃≤T≤28℃.
8. device according to claim 6, it is characterised in that described control unit is additionally operable to set the detection unit
Detection time；
Wherein, the magnitude of voltage U1Detection time point be t1, the magnitude of voltage U2Detection time point be t2, the battery it is disconnected
The electric time is Δ t=t2-t1, and the 5s≤Δ t≤10s.
9. device according to claim 6, it is characterised in that described control unit is additionally operable to set preset difference value, by institute
State internal resistance value RnWith the internal resistance value R of last timen-1It is compared, in the case where relatively difference is not more than preset difference value, by internal resistance value
RnIt is updated to the internal resistance value of the battery.
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Cited By (9)
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| CN109932661A (en) * | 2017-12-13 | 2019-06-25 | 宁德新能源科技有限公司 | A kind of battery status monitoring method and device |
| CN110133528A (en) * | 2018-02-09 | 2019-08-16 | 宝山钢铁股份有限公司 | A kind of the internal resistance measurement device and its measurement method of automatic measure on line lithium battery |
| CN111426969A (en) * | 2018-12-21 | 2020-07-17 | 中兴通讯股份有限公司 | Method and device for detecting internal resistance of battery and method and device for detecting aging of battery |
| CN111562508A (en) * | 2020-05-08 | 2020-08-21 | 上海电享信息科技有限公司 | Method for online detecting internal resistance abnormality of single battery in battery pack |
| CN112537224A (en) * | 2020-11-30 | 2021-03-23 | 蜂巢能源科技有限公司 | Battery internal resistance abnormality recognition method and device, storage medium and vehicle |
| CN112748350A (en) * | 2019-10-29 | 2021-05-04 | 南京德朔实业有限公司 | Battery pack fault judgment method, fault detection system and battery pack |
| CN113791361A (en) * | 2021-08-23 | 2021-12-14 | 欣旺达电子股份有限公司 | Internal resistance aging calculation method, system, management system, automobile and storage medium |
| WO2022061941A1 (en) * | 2020-09-28 | 2022-03-31 | 华为技术有限公司 | Battery parameter measurement method and apparatus |
| CN113791361B (en) * | 2021-08-23 | 2024-04-26 | 欣旺达电子股份有限公司 | Internal resistance aging calculation method, system, management system, automobile and storage medium |
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| CN113791361A (en) * | 2021-08-23 | 2021-12-14 | 欣旺达电子股份有限公司 | Internal resistance aging calculation method, system, management system, automobile and storage medium |
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Application publication date: 20170721 |