CN105203850B - Evaluation method, system and the vehicle of the internal resistance of cell - Google Patents
Evaluation method, system and the vehicle of the internal resistance of cell Download PDFInfo
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- CN105203850B CN105203850B CN201510714296.8A CN201510714296A CN105203850B CN 105203850 B CN105203850 B CN 105203850B CN 201510714296 A CN201510714296 A CN 201510714296A CN 105203850 B CN105203850 B CN 105203850B
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Abstract
The invention discloses a kind of evaluation method of the internal resistance of cell, system and vehicles, wherein this method includes：Obtain the initial voltage of battery, constant-current charge is carried out to battery under preset temperature, during carrying out constant-current charge to battery, it records the voltage of the corresponding battery of each sampling instant in multiple sampling instants and adds up to be filled with electricity, the accumulative influence coefficient for being filled with electricity and estimating the internal resistance of cell is obtained according to the corresponding accumulative electricity that is filled with of each sampling instant, and the internal resistance of battery is obtained according to the voltage of each corresponding battery of sampling instant in charging current, the initial voltage of battery, multiple sampling instants and influence coefficient.The evaluation method of the internal resistance of cell of the embodiment of the present invention can accurately estimate the internal resistance of cell in battery charging process, and estimation precision is high.
Description
Technical field
The present invention relates to battery technology fields, and in particular 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, such as the service life of battery, the charging of battery, electric discharge
Efficiency etc..In automobile technical field, the internal resistance by monitoring battery can assess the health status of battery, and then can analyze electricity
Influence of the health status in pond to vehicle performance.If the internal resistance of cell in automobile is more than certain restrictions, it may be necessary to consider more
The battery renewed, or need to carry out corresponding maintenance to battery to ensure the characteristic of vehicle.
Presently, there are the methods, such as direct-current discharge internal resistance measurement method, alternating current bridge method etc. of many estimation internal resistances of cell.
In direct-current discharge internal resistance measurement method, test equipment is to the through a DC stream of battery (high current for generally using 40A-80A), then
Battery both end voltage is measured, the internal resistance of cell is calculated using Ohm's law.AC bridge rule is that battery is equivalent active at one
Resistance applies a fixed frequency and fixed current (generally using 1kHZ frequencies, 50mA low currents at present), simultaneously at battery both ends
Voltage is sampled, calculates the internal resistance of the battery by operational amplification circuit after a series of processing such as over commutation, filtering
Value.
Although higher measurement accuracy can be obtained using direct-current discharge method, the constant electricity of special offer greatly is needed
Stream.Simultaneously as the condition limitation of evaluation method, the above method be difficult the internal resistance of cell realizing or measure on real vehicle exist compared with
Big error.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
One purpose is to propose that a kind of evaluation method of the internal resistance of cell, this method can be estimated accurately in battery charging process
Internal resistance, and estimation precision is high.
Second object of the present invention is to propose a kind of estimating system of the internal resistance of cell.
Third object of the present invention is to propose a kind of vehicle.
To achieve the above object, the embodiment of first aspect present invention proposes a kind of evaluation method of the internal resistance of cell, packet
Include following steps：Obtain the initial voltage of battery；Constant-current charge is carried out to the battery under preset temperature；To the battery
During carrying out constant-current charge, records the voltage of the corresponding battery of each sampling instant in multiple sampling instants and add up
It is filled with electricity；According to each sampling instant it is corresponding it is accumulative be filled with electricity and obtain this accumulative be filled with what electricity estimated the internal resistance of cell
Influence coefficient；And according to each sampling instant pair in charging current, the initial voltage of the battery, the multiple sampling instant
The voltage for the battery answered and the influence coefficient obtain the internal resistance of the battery.
The evaluation method of the internal resistance of cell according to the ... of the embodiment of the present invention first records multiple samplings during constant-current charging of battery
The voltage of the corresponding battery of each sampling instant is filled with electricity with accumulative in moment, corresponding accumulative further according to each sampling instant
Be filled with electricity obtain this it is accumulative be filled with the influence coefficient that electricity estimate the internal resistance of cell, finally according to charging current, battery at the beginning of
The voltage of each corresponding battery of sampling instant and influence coefficient obtain the internal resistance of battery in beginning voltage, multiple sampling instants, should
Method can accurately estimate the internal resistance in battery charging process, 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 technology
Feature：
According to one embodiment of present invention, during carrying out constant-current charge to the battery, further include：According to institute
State the corresponding battery of the first sampling instant in charging current, the initial voltage of the battery and the multiple sampling instant
Voltage obtain the ohmic internal resistance of the battery.
According to one embodiment of present invention, the evaluation method of the internal resistance of cell further includes：According in the battery
The ohmic internal resistance of resistance and the battery obtains the polarization resistance of battery.
According to one embodiment of present invention, it is described according to charging current, the battery initial voltage, the multiple adopt
The voltage of the corresponding battery of each sampling instant and the influence coefficient obtain the internal resistance of the battery in the sample moment, specifically
Including：It is corresponding described according to each sampling instant in charging current, the initial voltage of the battery, the multiple sampling instant
The voltage of battery and the influence coefficient obtain the internal resistance value of battery described in each sampling instant；To the multiple sampling instant one
The internal resistance value of one corresponding multiple batteries is averaged, to obtain the internal resistance of the battery.
According to one embodiment of present invention, the evaluation method of the internal resistance of cell further includes：According in the battery
Resistance analyzes the health status SOH of the battery.
In order to achieve the above objectives, the embodiment of second aspect of the present invention proposes a kind of estimating system of the internal resistance of cell, packet
It includes：Acquisition module, the initial voltage for obtaining battery；Charging module, it is permanent for being carried out to the battery under preset temperature
Current charge；Computing module, for during carrying out constant-current charge to the battery, recording and each being adopted in multiple sampling instants
The voltage of the sample moment corresponding battery is filled with electricity with accumulative, and adds up to be filled with electricity according to each sampling instant is corresponding
It obtains this to add up to be filled with the influence coefficient that electricity estimates the internal resistance of cell, and according to charging current, the initial electricity of the battery
The voltage of the corresponding battery of each sampling instant and the influence coefficient obtain the electricity in pressure, the multiple sampling instant
The internal resistance in pond.
The estimating system of the internal resistance of cell according to the ... of the embodiment of the present invention is corresponded to by computing module according to each sampling instant
It is accumulative be filled with electricity obtain this it is accumulative be filled with the influence coefficient that electricity estimates the internal resistance of cell, finally according to charging current, electricity
The voltage of each corresponding battery of sampling instant and influence coefficient obtain the interior of battery in the initial voltage in pond, multiple sampling instants
Resistance, which can accurately estimate the internal resistance in battery charging process, 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 technology
Feature：
According to one embodiment of present invention, the computing module is additionally operable to：Constant-current charge is being carried out to the battery
In the process, according to the first sampling instant in the charging current, the initial voltage of the battery and the multiple sampling instant
The voltage of the corresponding battery obtains the ohmic internal resistance of the battery.
According to one embodiment of present invention, the computing module is additionally operable to：According to the internal resistance of the battery and the electricity
The ohmic internal resistance in pond obtains the polarization resistance of battery.
According to one embodiment of present invention, the computing module is used for：According to charging current, the initial electricity of the battery
The voltage of the corresponding battery of each sampling instant and the influence coefficient obtain each adopt in pressure, the multiple sampling instant
The internal resistance value of battery described in the sample moment；It averages to the internal resistance value of the multiple sampling instant multiple batteries correspondingly,
To obtain the internal resistance of the battery.
Further, the embodiment of third aspect present invention proposes a kind of vehicle, including the internal resistance of cell is estimated
Calculation system.The vehicle can accurately estimate the internal resistance in battery charging process, and estimation precision is high.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the flow chart of the evaluation method of the internal resistance of cell according to the ... of 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 structure diagram of the estimating system of the internal resistance of cell according to the ... of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings evaluation method, system and the vehicle of the internal resistance of cell of the embodiment of the present invention are described.
Fig. 1 is the flow chart 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 the internal resistance of cell includes the following steps：
S101 obtains the initial voltage of battery.
Specifically, as shown in Fig. 2, T0Before moment, battery keeps static condition, and the cell voltage recorded at this time is V0.Its
In, V0Not equal to zero, for example, the termination discharge voltage of cell phone lithium-ion batteries is generally 2.75V~3.0V.It is appreciated that can
Rechargeable lithium ion battery can not overcharge, cross and put in use, otherwise can damage battery or be allowed to scrap.Therefore, charging lithium from
Protection component or protection circuit are typically provided on sub- battery to prevent its damage.
S102 carries out constant-current charge under preset temperature to battery.
Wherein, preset temperature can be room temperature, such as can be 20 DEG C.
Specifically, as shown in Fig. 2, from T0From moment, start to carry out constant-current charge, charging current I to battery.
In one embodiment of the invention, constant-current charge is carried out to battery under preset temperature, it can also be according to charging
The voltage of the corresponding battery of the first sampling instant obtains the Europe of battery in electric current, the initial voltage of battery and multiple sampling instants
Nurse internal resistance.
Specifically, as shown in figure 3, the initial voltage of battery is V0', from T0' from the moment, start to carry out constant current to battery to fill
Electricity, charging current I', charging time T1'-T0', the first sampling instant is T1', the first sampling instant, i.e. T1' moment correspondence
Battery voltage be V1', then the ohmic internal resistance ohmR of battery can be calculated by formula (1)：
OhmR=(V1'-V0')/I' (1)
S103 records each sampling instant in multiple sampling instants and corresponds to during carrying out constant-current charge to battery
Battery voltage and accumulative be filled with electricity.
Wherein, as shown in Fig. 2, multiple sampling instants are T1,T2,...,Tn-1,Tn, corresponding voltage is V1,V2,...,
Vn-1,Vn, wherein n is positive integer.
In an embodiment of the present invention, add up the current capacities for being filled with electricity and battery, i.e. SOC (State of
Charge, state-of-charge) there are correspondences.Wherein, add up to be filled with electric quantity unit to be ampere-hour (i.e. Ah), SOC represents battery
The ratio of current capacities and the capacity of its fully charged state is commonly used percentage and is indicated.Its value range is 0~1, works as SOC=0
When indicate battery discharge it is complete, as SOC=1 indicate battery be completely filled with.
S104, according to each sampling instant it is corresponding it is accumulative be filled with electricity and obtain this accumulative be filled with electricity the internal resistance of cell estimated
The influence coefficient of calculation.
Wherein, add up to be filled with the influence coefficient that electricity estimates the internal resistance of cell, i.e., certain time in battery charging process
Voltage increment.
Specifically, it can be inquired from table 1 and this is calculated and add up to be filled with the influence system that electricity estimates the internal resistance of cell
Number.
Table 1
| Monomer voltage (V) | SOC (%) | It is accumulative 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, the accumulative electricity that is filled with is 0, i.e., battery standing for a period of time after voltage be
3.4V；When battery it is accumulative be filled with electricity be 10.8Ah when, SOC 10%, voltage increment Δ V be 3.56V-3.4V=0.16V；
When to be filled with electricity be 108Ah for battery accumulative, the full electricity of SOC 100%, i.e. battery, voltage increment Δ V is 4.12V-3.4V=
0.72V。
S105, according to each corresponding battery of sampling instant in charging current, the initial voltage of battery, multiple sampling instants
Voltage and influence coefficient obtain the internal resistance of battery.
In an embodiment of the present invention, it is each sampled according in charging current, the initial voltage of battery, multiple sampling instants
The voltage and influence coefficient of moment corresponding battery obtain the internal resistance of battery, specifically include：According to charging current, battery it is initial
The voltage of each corresponding battery of sampling instant and influence coefficient obtain each sampling instant battery in voltage, multiple sampling instants
Internal resistance value；It averages to the internal resistance value of multiple sampling instants multiple batteries correspondingly, to obtain the internal resistance of battery.
Specifically, as shown in Fig. 2, T can be calculated by formula (2)nThe internal resistance of sampling instant battery：
polarRn=(Vn-ΔVn-V0)/I (2)
Wherein, polarRnFor T in battery charging processnThe internal resistance of the battery at moment, I are charging current, V0For at the beginning of battery
Beginning voltage, VnFor TnThe voltage and Δ V of moment batterynFor TnThe voltage increment of the battery at moment is (i.e.：Influence coefficient).
It should be noted that if sampling instant is compared with T0Time at intervals is very short, and SOC increments are less than preset value, such as can be
1%, then Δ VnIt is definite value.If sampling instant is compared with T0Time at intervals is longer, and SOC increments are more than preset value, such as 1%, then Δ VnIt is to become
Amount, can pass through 1 acquisition of tabling look-up.
It further, can be by making (3) to calculate the internal resistance of cell：
PolarR=(polarR1+polarR2+...+polarRn)/n (3)
In an embodiment of the present invention, it can be obtained in the polarization of battery according to the internal resistance of battery and the ohmic internal resistance of battery
Resistance.
Specifically, the polarization resistance R of battery can be calculated by formula (4)：
R=polarR-ohmR (4)
Further, the health status SOH of the battery can be analyzed according to the internal resistance of battery.
The evaluation method of the internal resistance of cell according to the ... of the embodiment of the present invention first records multiple samplings during constant-current charging of battery
The voltage of the corresponding battery of each sampling instant is filled with electricity with accumulative in moment, corresponding accumulative further according to each sampling instant
Be filled with electricity obtain this it is accumulative be filled with the influence coefficient that electricity estimate the internal resistance of cell, finally according to charging current, battery at the beginning of
The voltage of each corresponding battery of sampling instant and influence coefficient obtain the internal resistance of battery in beginning voltage, multiple sampling instants, should
Method can accurately estimate the internal resistance in battery charging process, and estimation precision is high.
Fig. 4 is the structure diagram 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 the internal resistance of cell includes：Acquisition module 100, charging module 200 and computing module
300。
Wherein, acquisition module 100 is used to obtain the initial voltage of battery；Charging module 200 is for right under preset temperature
Battery carries out constant-current charge；Computing module 300 is used to during carrying out constant-current charge to battery, record multiple sampling instants
In each corresponding battery of sampling instant voltage and it is accumulative be filled with electricity, and accumulative be filled with according to each sampling instant is corresponding
Electricity, which obtains this, to be added up to be filled with the influence coefficient that electricity estimates the internal resistance of cell, and according to charging current, the initial electricity of battery
The voltage of the corresponding battery of each sampling instant and influence coefficient obtain the internal resistance of battery in pressure, multiple sampling instants.
In one embodiment of the invention, computing module 300 is additionally operable to during carrying out constant-current charge to battery,
It is obtained according to the voltage of the corresponding battery of the first sampling instant in charging current, the initial voltage of battery and multiple sampling instants
The ohmic internal resistance of battery；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 is additionally operable to the initial electricity according to charging current, battery
The voltage of the corresponding battery of each sampling instant and influence coefficient obtain each sampling instant battery in pressure, multiple sampling instants
Internal resistance value；It averages to the internal resistance value of multiple sampling instants multiple batteries correspondingly, to obtain the internal resistance of battery.
The estimating system of the internal resistance of cell according to the ... of the embodiment of the present invention is corresponded to by computing module according to each sampling instant
It is accumulative be filled with electricity obtain this it is accumulative be filled with the influence coefficient that electricity estimates the internal resistance of cell, finally according to charging current, electricity
The voltage of each corresponding battery of sampling instant and influence coefficient obtain the interior of battery in the initial voltage in pond, multiple sampling instants
Resistance, which can accurately estimate the internal resistance in battery charging process, and estimation precision is high.
It should be noted that the specific implementation mode and the present invention of the estimating system of the internal resistance of cell of the embodiment of the present invention are real
The specific implementation mode for applying the evaluation method of the internal resistance of cell of example is similar, to reduce redundancy, is not repeated herein.
Further, the present invention proposes a kind of vehicle, includes the estimation system of the internal resistance of cell of the above embodiment of the present invention
System.The vehicle can accurately estimate the internal resistance in battery charging process, and estimation precision is high.
In addition, other compositions of vehicle according to the ... of the embodiment of the present invention and effect are for those of ordinary skill in the art
For be all known, in order to reduce redundancy, be not repeated herein.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (6)
1. a kind of evaluation method of the internal resistance of cell, which is characterized in that include the following steps：
Obtain the initial voltage of battery；
Constant-current charge is carried out to the battery under preset temperature；
During carrying out constant-current charge to the battery, it is corresponding described to record each sampling instant in multiple sampling instants
The voltage of battery is filled with electricity with accumulative；
The accumulative influence for being filled with electricity and estimating the internal resistance of cell is obtained according to the corresponding accumulative electricity that is filled with of each sampling instant
Coefficient, wherein the influence coefficient is to add up to be filled with the corresponding voltage increment of electricity；And
According to the corresponding institute of the first sampling instant in charging current, the initial voltage of the battery and the multiple sampling instant
The voltage for stating battery obtains the ohmic internal resistance of the battery, and according to charging current, the initial voltage, described more of the battery
The voltage of the corresponding battery of each sampling instant and the influence coefficient obtain the internal resistance of the battery in a sampling instant；
The polarization resistance of battery is obtained according to the ohmic internal resistance of the internal resistance of the battery and the battery.
2. the evaluation method of the internal resistance of cell according to claim 1, which is characterized in that it is described according to charging current, it is described
The voltage of the corresponding battery of each sampling instant and influence system in the initial voltage of battery, the multiple sampling instant
Number obtains the internal resistance of the battery, specifically includes：
It is corresponding described according to each sampling instant in charging current, the initial voltage of the battery, the multiple sampling instant
The voltage of battery and the influence coefficient obtain the internal resistance value of battery described in each sampling instant；
It averages to the internal resistance value of the multiple sampling instant multiple batteries correspondingly, to obtain in the battery
Resistance.
3. the evaluation method of the internal resistance of cell according to claim 1 or 2, which is characterized in that further include：According to the battery
Internal resistance analyze the health status SOH of the battery.
4. a kind of estimating system of the internal resistance of cell, which is characterized in that including：
Acquisition module, the initial voltage for obtaining battery；
Charging module, for carrying out constant-current charge to the battery under preset temperature；
Computing module, for during carrying out constant-current charge to the battery, recording and each being sampled in multiple sampling instants
The voltage of the moment corresponding battery and it is accumulative be filled with electricity, and accumulative be filled with electricity according to each sampling instant is corresponding and obtain
To the accumulative influence coefficient for being filled with electricity and estimating the internal resistance of cell, according to charging current, the battery initial voltage and
The voltage of the corresponding battery of the first sampling instant obtains the ohmic internal resistance of the battery in the multiple sampling instant, according to
The electricity of each corresponding battery of sampling instant in charging current, the initial voltage of the battery, the multiple sampling instant
Pressure and the influence coefficient obtain the internal resistance of the battery, and the internal resistance and the battery according to the battery ohmic internal resistance
Obtain the polarization resistance of battery, wherein the influence coefficient is to add up to be filled with the corresponding voltage increment of electricity.
5. the estimating system of the internal resistance of cell according to claim 4, which is characterized in that the computing module is used for：
It is corresponding described according to each sampling instant in charging current, the initial voltage of the battery, the multiple sampling instant
The voltage of battery and the influence coefficient obtain the internal resistance value of battery described in each sampling instant；
It averages to the internal resistance value of the multiple sampling instant multiple batteries correspondingly, to obtain in the battery
Resistance.
6. a kind of vehicle, which is characterized in that including：The estimating system of the internal resistance of cell described in 4 or 5 is wanted according to right.
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| CN106324358B (en) * | 2016-08-17 | 2020-06-16 | 惠州市蓝微新源技术有限公司 | Dynamic detection method for internal resistance of battery cell |
| CN107462837B (en) * | 2017-07-31 | 2019-07-12 | 成都雅骏新能源汽车科技股份有限公司 | A kind of SOH evaluation method based on monomer voltage statistics |
| CN109633471A (en) * | 2018-12-24 | 2019-04-16 | 银隆新能源股份有限公司 | Method for determining the state-of-charge and open terminal voltage corresponding relationship of battery |
| CN116243197B (en) * | 2023-05-12 | 2023-07-21 | 国民技术股份有限公司 | Method and device for predicting SOH of battery |
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| CN102053226B (en) * | 2009-10-29 | 2013-04-10 | 比亚迪股份有限公司 | Device and method for testing internal resistance of battery |
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| CN101477149A (en) * | 2008-12-12 | 2009-07-08 | 艾默生网络能源有限公司 | On-line DC detection method and system for internal resistance of accumulator |
| CN103308858A (en) * | 2012-03-07 | 2013-09-18 | 深圳市柏特瑞电子有限公司 | Online inspection system for internal resistances of batteries |
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