CN105203850A - Battery internal resistance estimation method and system, and vehicle - Google Patents
Battery internal resistance estimation method and system, and vehicle Download PDFInfo
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- CN105203850A CN105203850A CN201510714296.8A CN201510714296A CN105203850A CN 105203850 A CN105203850 A CN 105203850A CN 201510714296 A CN201510714296 A CN 201510714296A CN 105203850 A CN105203850 A CN 105203850A
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Abstract
The invention provides a battery internal resistance estimation method and system, and a vehicle. The method comprises the following steps: acquiring initial voltage of a battery; performing constant-current charging on the battery under a preset temperature; in the constant-current charging process of the battery, recording voltage and accumulated charging amount of the battery at each sampling time in a plurality of sampling times; obtaining an influence coefficient of the accumulated charging amounts to battery internal resistance estimation according to accumulated charging amount corresponding to each time, and obtaining the internal resistance of the battery according to charging current, battery initial voltage, the battery voltage corresponding to each sampling time in the sampling times, and the influence coefficient. Through the battery internal resistance estimation method provided by the embodiment of the invention, the battery internal resistance in the battery charging process can be accurately estimated, and the evaluation accuracy is high.
Description
Technical field
The present invention relates to cell art, be specifically related to a kind of evaluation method of the internal resistance of cell, system and vehicle.
Background technology
The performance of the internal resistance of cell direct reaction cell to a certain extent, the life-span of such as battery, the charging of battery, discharging efficiency etc.In automobile technical field, the health status of battery can be assessed by the internal resistance of monitoring battery, and then the impact of health status on vehicle performance of battery can be analyzed.If the internal resistance of cell in automobile is more than a definite limitation, the battery considering more to renew may be needed, or need to carry out maintaining with the characteristic ensureing car load accordingly to battery.
The method of a lot of estimating battery internal resistance of current existence, such as direct-current discharge internal resistance measurement method, alternating current bridge method etc.In direct-current discharge internal resistance measurement method, testing apparatus, to the through a DC stream of battery (the general big current using 40A-80A), is then measured battery both end voltage, is utilized Ohm law to calculate the internal resistance of cell.Alternating current bridge rule is that battery equivalence is become an active pull-up, a fixed frequency and fixed current (general use 1kHZ frequency is at present applied at battery two ends, 50mA small area analysis), voltage is sampled simultaneously, after a series of process such as overcommutation, filtering, calculated the internal resistance value of this battery by operational amplification circuit.
Although adopt direct-current discharge method can obtain higher measuring accuracy, need to provide large steady current specially.Meanwhile, because the condition of evaluation method limits, there is larger error in the internal resistance of cell that said method is difficult to realize on real vehicle or record.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.For this reason, one object of the present invention is the evaluation method proposing a kind of internal resistance of cell, and the method can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
Second object of the present invention is the estimating system proposing a kind of internal resistance of cell.
3rd object of the present invention is to propose a kind of vehicle.
For achieving the above object, the embodiment of first aspect present invention proposes a kind of evaluation method of the internal resistance of cell, comprises the following steps: the initial voltage obtaining battery; Under preset temperature, constant-current charge is carried out to described battery; Described battery is being carried out in the process of constant-current charge, recording the voltage of described battery corresponding to each sampling instant in multiple sampling instant and add up to be filled with electricity; Accumulative the be filled with electricity corresponding according to each sampling instant obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell; And the internal resistance of described battery is obtained according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient.
According to the evaluation method of the internal resistance of cell of the embodiment of the present invention, first record the voltage of the battery that each sampling instant is corresponding in multiple sampling instant in constant-current charging of battery process and add up to be filled with electricity, the accumulative electricity that is filled with corresponding according to each sampling instant again obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell, last according to charging current, the initial voltage of battery, in multiple sampling instant, the voltage of the battery that each sampling instant is corresponding and influence coefficient obtain the internal resistance of battery, the method can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
In addition, the evaluation method of the internal resistance of cell according to the above embodiment of the present invention can also have following additional technical characteristic:
According to one embodiment of present invention, carrying out described battery, in the process of constant-current charge, also comprising: the ohmic internal resistance obtaining described battery according to the voltage of described battery corresponding to the first sampling instant in the initial voltage of described charging current, described battery and described multiple sampling instant.
According to one embodiment of present invention, the evaluation method of the described internal resistance of cell also comprises: the polarization resistance obtaining battery according to the internal resistance of described battery and the ohmic internal resistance of described battery.
According to one embodiment of present invention, in the described initial voltage according to charging current, described battery, described multiple sampling instant, the voltage of the described battery that each sampling instant is corresponding and described influence coefficient obtain the internal resistance of described battery, specifically comprise: the internal resistance value obtaining battery described in each sampling instant according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient; The internal resistance value of described multiple sampling instant multiple battery is one to one averaged, to obtain the internal resistance of described battery.
According to one embodiment of present invention, the evaluation method of the described internal resistance of cell also comprises: the health status SOH analyzing described battery according to the internal resistance of described battery.
For achieving the above object, the embodiment of second aspect present invention proposes a kind of estimating system of the internal resistance of cell, comprising: acquisition module, for obtaining the initial voltage of battery; Charging module, for carrying out constant-current charge to described battery under preset temperature; Computing module, for carrying out in the process of constant-current charge to described battery, record the voltage of described battery corresponding to each sampling instant in multiple sampling instant and add up to be filled with electricity, and be filled with electricity according to corresponding accumulative of each sampling instant and obtain this accumulative influence coefficient being filled with electricity and the internal resistance of cell is estimated, and obtain the internal resistance of described battery according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient.
According to the estimating system of the internal resistance of cell of the embodiment of the present invention, accumulative the be filled with electricity corresponding according to each sampling instant by computing module obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell, the voltage of the last battery corresponding according to each sampling instant in the initial voltage of charging current, battery, multiple sampling instant and influence coefficient obtain the internal resistance of battery, this system can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
In addition, the estimating system of the internal resistance of cell according to the above embodiment of the present invention can also have following additional technical characteristic:
According to one embodiment of present invention, described computing module also for: described battery is being carried out in the process of constant-current charge, is obtaining the ohmic internal resistance of described battery according to the voltage of described battery corresponding to the first sampling instant in the initial voltage of described charging current, described battery and described multiple sampling instant.
According to one embodiment of present invention, described computing module is also for the polarization resistance that obtains battery according to the internal resistance of described battery and the ohmic internal resistance of described battery.
According to one embodiment of present invention, described computing module is used for: the internal resistance value obtaining battery described in each sampling instant according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient; The internal resistance value of described multiple sampling instant multiple battery is one to one averaged, to obtain the internal resistance of described battery.
Further, the embodiment of third aspect present invention proposes a kind of vehicle, comprises the estimating system of the described internal resistance of cell.This vehicle can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the process flow diagram of the evaluation method of the internal resistance of cell according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of internal resistance of cell evaluation method according to an embodiment of the invention;
Fig. 3 is the schematic diagram of the evaluation method of the internal resistance of cell in accordance with another embodiment of the present invention;
Fig. 4 is the structured flowchart of the estimating system of the internal resistance of cell according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings the evaluation method of the internal resistance of cell of the embodiment of the present invention, system and vehicle are described.
Fig. 1 is the process flow diagram of the evaluation method of the internal resistance of cell of the embodiment of the present invention.
As shown in Figure 1, the evaluation method of this internal resistance of cell comprises the following steps:
S101, obtains the initial voltage of battery.
Particularly, as shown in Figure 2, T
0before moment, battery keeps static condition, and record cell voltage is now V
0.Wherein, V
0be not equal to zero, such as, the termination sparking voltage of cell phone lithium-ion batteries is generally 2.75V ~ 3.0V.Be appreciated that rechargeable lithium ion batteries in use can not overcharge, cross and put, otherwise battery can be damaged or make it to scrap.Therefore, rechargeable lithium ion battery is generally provided with protection components and parts or protection circuit damage to prevent it.
S102, carries out constant-current charge to battery under preset temperature.
Wherein, preset temperature can be room temperature, such as, can be 20 DEG C.
Particularly, as shown in Figure 2, from T
0moment rises, and starts to carry out constant-current charge to battery, and charging current is I.
In one embodiment of the invention, under preset temperature, constant-current charge is carried out to battery, the ohmic internal resistance of battery can also be obtained according to the voltage of battery corresponding to the first sampling instant in the initial voltage of charging current, battery and multiple sampling instant.
Particularly, as shown in Figure 3, the initial voltage of battery is V
0', from T
0' the moment rises, start to carry out constant-current charge to battery, charging current is I', and the duration of charging is T
1'-T
0', the first sampling instant is T
1', the first sampling instant, i.e. T
1' the voltage of battery corresponding to moment is V
1', then the ohmic internal resistance ohmR of battery can calculate by through type (1):
ohmR＝(V
1'-V
0')/I'(1)
S103, is carrying out in the process of constant-current charge to battery, record the voltage of the battery that each sampling instant is corresponding in multiple sampling instant and add up to be filled with electricity.
Wherein, as shown in Figure 2, multiple sampling instant is T
1, T
2..., T
n-1, T
n, corresponding voltage is V
1, V
2..., V
n-1, V
n, wherein n is positive integer.
In an embodiment of the present invention, the accumulative current capacities being filled with electricity and battery, namely there is corresponding relation in SOC (StateofCharge, state-of-charge).Wherein, adding up to be filled with electric quantity unit is ampere-hour (i.e. Ah), and SOC represents the ratio of the current capacities of battery and the capacity of its fully charged state, and conventional percentage represents.Its span is 0 ~ 1, represents that battery discharge is complete, represent that battery is full of completely as SOC=1 as SOC=0.
S104, accumulative the be filled with electricity corresponding according to each sampling instant obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell.
Wherein, the accumulative influence coefficient being filled with electricity and the internal resistance of cell is estimated, the i.e. voltage increment of certain period in battery charging process.
Particularly, can inquire about from table 1 and calculate this accumulative influence coefficient being filled with electricity and the internal resistance of cell is estimated.
Table 1
| Monomer voltage (V) | SOC(％) | Add up to be filled with electricity (Ah) |
| 3.4V | 0％ | 0 |
| 3.56V | 10％ | 10.8Ah |
| 3.61V | 20％ | 21.6Ah |
| 3.67V | 30％ | 32.4Ah |
| 3.72V | 40％ | 43.2Ah |
| 3.80V | 50％ | 50.0Ah |
| 3.90V | 60％ | 64.8Ah |
| 3.95V | 70％ | 75.6Ah |
| 4.01V | 80％ | 86.4Ah |
| 4.08V | 90％ | 97.2Ah |
| 4.12V | 100％ | 108Ah |
As shown in table 1, when battery is uncharged, adding up to be filled with electricity is 0, and the voltage namely after battery standing a period of time is 3.4V; When to be filled with electricity be 10.8Ah for battery accumulative, SOC is 10%, and voltage increment Δ V is 3.56V-3.4V=0.16V; When to be filled with electricity be 108Ah for battery accumulative, SOC is 100%, i.e. the full electricity of battery, and voltage increment Δ V is 4.12V-3.4V=0.72V.
S105, obtains the internal resistance of battery according to the voltage of battery corresponding to each sampling instant in the initial voltage of charging current, battery, multiple sampling instant and influence coefficient.
In an embodiment of the present invention, obtain the internal resistance of battery according to the voltage of battery corresponding to each sampling instant in the initial voltage of charging current, battery, multiple sampling instant and influence coefficient, specifically comprise: the internal resistance value obtaining each sampling instant battery according to the voltage of battery corresponding to each sampling instant in the initial voltage of charging current, battery, multiple sampling instant and influence coefficient; The internal resistance value of multiple sampling instant multiple battery is one to one averaged, to obtain the internal resistance of battery.
Particularly, as shown in Figure 2, T is calculated by formula (2)
nthe internal resistance of sampling instant battery:
polarR
n＝(V
n-ΔV
n-V
0)/I(2)
Wherein, polarR
nfor T in battery charging process
nthe internal resistance of the battery in moment, I is charging current, V
0for initial voltage of battery, V
nfor T
nthe voltage of moment battery and Δ V
nfor T
nthe voltage increment (that is: influence coefficient) of the battery in moment.
It should be noted that, if sampling instant comparatively T
0time at intervals is very short, and SOC increment is less than preset value, such as, can be 1%, then Δ V
nit is definite value.If sampling instant is T comparatively
0time at intervals is longer, and SOC increment exceedes preset value, as 1%, then and Δ V
nvariable, by 1 acquisition of tabling look-up.
Further, the internal resistance of cell can be calculated by making (3):
polarR＝(polarR
1+polarR
2+...+polarR
n)/n(3)
In an embodiment of the present invention, the polarization resistance of battery can be obtained according to the ohmic internal resistance of the internal resistance of battery and battery.
Particularly, the polarization resistance R of battery calculates by formula (4):
R＝polarR-ohmR(4)
Further, the health status SOH of described battery can be analyzed according to the internal resistance of battery.
According to the evaluation method of the internal resistance of cell of the embodiment of the present invention, first record the voltage of the battery that each sampling instant is corresponding in multiple sampling instant in constant-current charging of battery process and add up to be filled with electricity, the accumulative electricity that is filled with corresponding according to each sampling instant again obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell, last according to charging current, the initial voltage of battery, in multiple sampling instant, the voltage of the battery that each sampling instant is corresponding and influence coefficient obtain the internal resistance of battery, the method can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
Fig. 4 is the structured flowchart of the estimating system of the internal resistance of cell of the embodiment of the present invention.
As shown in Figure 4, the estimating system of this internal resistance of cell comprises: acquisition module 100, charging module 200 and computing module 300.
Wherein, acquisition module 100 is for obtaining the initial voltage of battery; Charging module 200 for carrying out constant-current charge to battery under preset temperature; Computing module 300 is for carrying out in the process of constant-current charge to battery, record the voltage of the battery that each sampling instant is corresponding in multiple sampling instant and add up to be filled with electricity, and be filled with electricity according to corresponding accumulative of each sampling instant and obtain this accumulative influence coefficient being filled with electricity and the internal resistance of cell is estimated, and obtain the internal resistance of battery according to the voltage of battery corresponding to each sampling instant in the initial voltage of charging current, battery, multiple sampling instant and influence coefficient.
In one embodiment of the invention, computing module 300, also for carrying out in the process of constant-current charge to battery, obtains the ohmic internal resistance of battery according to the voltage of battery corresponding to the first sampling instant in the initial voltage of charging current, battery and multiple sampling instant; And the polarization resistance of battery is obtained according to the internal resistance of battery and the ohmic internal resistance of battery.
In another embodiment of the present invention, computing module 300 also obtains the internal resistance value of each sampling instant battery for the voltage of battery corresponding to each sampling instant in the initial voltage according to charging current, battery, multiple sampling instant and influence coefficient; The internal resistance value of multiple sampling instant multiple battery is one to one averaged, to obtain the internal resistance of battery.
According to the estimating system of the internal resistance of cell of the embodiment of the present invention, accumulative the be filled with electricity corresponding according to each sampling instant by computing module obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell, the voltage of the last battery corresponding according to each sampling instant in the initial voltage of charging current, battery, multiple sampling instant and influence coefficient obtain the internal resistance of battery, this system can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
It should be noted that, the embodiment of the evaluation method of the embodiment of the estimating system of the internal resistance of cell of the embodiment of the present invention and the internal resistance of cell of the embodiment of the present invention is similar, for reducing redundancy, does not repeat herein.
Further, the present invention proposes a kind of vehicle, comprise the estimating system of the internal resistance of cell of the above embodiment of the present invention.This vehicle can estimate the internal resistance in battery charging process exactly, and estimation precision is high.
In addition, according to the vehicle of the embodiment of the present invention other form and effect be all known for the ordinary skill in the art, in order to reduce redundancy, do not repeat herein.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this instructions or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. an evaluation method for the internal resistance of cell, is characterized in that, comprises the following steps:
Obtain the initial voltage of battery;
Under preset temperature, constant-current charge is carried out to described battery;
Described battery is being carried out in the process of constant-current charge, recording the voltage of described battery corresponding to each sampling instant in multiple sampling instant and add up to be filled with electricity;
Accumulative the be filled with electricity corresponding according to each sampling instant obtains this accumulative influence coefficient being filled with electricity and estimating the internal resistance of cell; And
The internal resistance of described battery is obtained according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient.
2. the evaluation method of the internal resistance of cell according to claim 1, is characterized in that, is carrying out, in the process of constant-current charge, also comprising described battery:
The ohmic internal resistance of described battery is obtained according to the voltage of described battery corresponding to the first sampling instant in the initial voltage of described charging current, described battery and described multiple sampling instant.
3. the evaluation method of the internal resistance of cell according to claim 2, is characterized in that, also comprises:
The polarization resistance of battery is obtained according to the internal resistance of described battery and the ohmic internal resistance of described battery.
4. the evaluation method of the internal resistance of cell according to claim 1, it is characterized in that, in the described initial voltage according to charging current, described battery, described multiple sampling instant, the voltage of the described battery that each sampling instant is corresponding and described influence coefficient obtain the internal resistance of described battery, specifically comprise:
The internal resistance value of battery described in each sampling instant is obtained according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient;
The internal resistance value of described multiple sampling instant multiple battery is one to one averaged, to obtain the internal resistance of described battery.
5. the evaluation method of the internal resistance of cell according to any one of claim 1-4, is characterized in that, also comprises: the health status SOH analyzing described battery according to the internal resistance of described battery.
6. an estimating system for the internal resistance of cell, is characterized in that, comprising:
Acquisition module, for obtaining the initial voltage of battery;
Charging module, for carrying out constant-current charge to described battery under preset temperature;
Computing module, for carrying out in the process of constant-current charge to described battery, record the voltage of described battery corresponding to each sampling instant in multiple sampling instant and add up to be filled with electricity, and be filled with electricity according to corresponding accumulative of each sampling instant and obtain this accumulative influence coefficient being filled with electricity and the internal resistance of cell is estimated, and obtain the internal resistance of described battery according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient.
7. the estimating system of the internal resistance of cell according to claim 6, it is characterized in that, described computing module also for: described battery is being carried out in the process of constant-current charge, is obtaining the ohmic internal resistance of described battery according to the voltage of described battery corresponding to the first sampling instant in the initial voltage of described charging current, described battery and described multiple sampling instant.
8. the estimating system of the internal resistance of cell according to claim 7, is characterized in that, described computing module is also for the polarization resistance that obtains battery according to the internal resistance of described battery and the ohmic internal resistance of described battery.
9. the estimating system of the internal resistance of cell according to claim 6, is characterized in that, described computing module is used for:
The internal resistance value of battery described in each sampling instant is obtained according to the voltage of described battery corresponding to each sampling instant in the initial voltage of charging current, described battery, described multiple sampling instant and described influence coefficient;
The internal resistance value of described multiple sampling instant multiple battery is one to one averaged, to obtain the internal resistance of described battery.
10. a vehicle, is characterized in that, comprising: the estimating system of the internal resistance of cell according to any one of claim 6-9.
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