CN104833856A - Method and device for estimating internal resistance of battery - Google Patents
Method and device for estimating internal resistance of battery Download PDFInfo
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- CN104833856A CN104833856A CN201410047991.9A CN201410047991A CN104833856A CN 104833856 A CN104833856 A CN 104833856A CN 201410047991 A CN201410047991 A CN 201410047991A CN 104833856 A CN104833856 A CN 104833856A
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- residual electricity
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Abstract
Disclosed is a method for estimating the internal resistance of a battery. The method comprises the following steps: measuring the terminal voltage and the charging current of the battery at the start of performing constant current charging of the battery; obtaining an initial residual electric quantity when the battery is subjected to the constant current charging; finding an initial open-circuit voltage corresponding to the initial residual electric quantity from relation contrasting data recording corresponding relationship of the residual electric quantity and the open-circuit voltage of the battery; and calculating the internal resistance of the battery according to the initial open-circuit voltage, the terminal voltage, and the charging current. The invention further relates to a device for estimating the internal resistance of the battery.
Description
Technical field
The present invention relates to rechargeable battery technology, particularly relate to a kind of internal resistance of cell estimating and measuring method and device.
Background technology
The performance of current battery on the market all can be aging gradually along with the time, and aging phenomenon the most directly affects, and is to cause electric capacity to decline, and the situation simultaneously also risen along with internal battery impedance occurs.In order to improve the accuracy that residual electricity (State of Charge, SOC) is estimated, need accurately to estimate cell health state (State of Health, SOH).The method wherein estimating SOH is then that the relation of the internal resistance of cell and SOH is created as a table by experiment, is tabling look-up estimate the SOH of battery instantly by measuring internal resistance value.For lithium ion battery, the internal resistance of cell generally comprises ohmic internal resistance and polarization resistance.Ohmic internal resistance is made up of the contact resistance of electrode material, electrolytic solution, membrane electrical resistance and each several part part.By the resistance caused that polarizes when polarization resistance refers to electrochemical reaction, comprise the resistance that activation polarization and concentration polarization cause.Battery internal resistance can have difference along with different output currents, battery access times, temperature and aging performance.
A kind of existing method measuring internal resistance is voltage, electric current and the temperature information of acquisition battery under the change of certain predetermined current, calculate internal resistance value, and this kind of mode could must use through specific curent change at battery, therefore be restricted in use, must wait for that battery reaches pre-conditioned and could estimate SOH.
Summary of the invention
For the problems referred to above, be necessary to provide one conveniently internal resistance of cell estimating and measuring method.
In addition, there is a need to provide one conveniently internal resistance of cell estimating apparatus.
A kind of internal resistance of cell estimating and measuring method, the method comprises the steps:
Battery carry out constant-current charge start time, measure the terminal voltage of battery and charging current;
Acquisition battery starts initial residual electricity when carrying out constant-current charge;
According to described initial residual electricity, record the comparison data of the residual electricity of battery and the corresponding relation of open-circuit voltage from one, find out the value of the initial open circuit voltage corresponding with described initial residual electricity; And
The internal resistance of battery is calculated according to the value of described initial open circuit voltage, terminal voltage and charging current.
A kind of internal resistance of cell estimating apparatus, for estimating the internal resistance of a battery, described internal resistance of cell estimating apparatus comprises:
Memory module, for the comparison data of the corresponding relation of the residual electricity and open-circuit voltage that store a record battery;
Measurement module, for carry out at battery constant-current charge start time, measure the terminal voltage of battery and charging current;
Processing module, for obtaining the initial residual electricity that battery starts when carrying out constant-current charge; Described processing module comprises:
Search unit, for according to described initial residual electricity, from described comparison data, find out the value of the initial open circuit voltage corresponding with described initial residual electricity; And
Computing unit, calculates the internal resistance of battery according to the value of described initial open circuit voltage, terminal voltage and charging current.
Described internal resistance of cell estimating apparatus and method estimate the internal resistance of cell by utilizing the parameters such as the voltage under battery constant-current charge state and electric current, under constant-current charge pattern, there is stable battery behavior due to battery and there is the circuit model of simplification, therefore, can be facilitated by described internal resistance of cell estimating apparatus and method and estimate the internal resistance of cell exactly.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the internal resistance of cell estimating apparatus of better embodiment of the present invention.
The schematic diagram of the better embodiment of the comparison data that the memory module that Fig. 2 is the internal resistance of cell estimating apparatus shown in Fig. 1 stores.
Fig. 3 is Dai Weining (Thevenin) battery equivalent-circuit model figure.
Fig. 4 and Fig. 5 is the process flow diagram of the internal resistance of cell estimating and measuring method of better embodiment of the present invention.
Main element symbol description
| Internal resistance of cell estimating apparatus | 100 |
| Measurement module | 10 |
| Processing module | 20 |
| Memory module | 30 |
| Electric quantity metering unit | 21 |
| Search unit | 22 |
| Computing unit | 23 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, the internal resistance of cell estimating apparatus 100 of better embodiment of the present invention, for estimating the internal resistance of a battery under the constant-current charge pattern of battery.Internal resistance estimating apparatus 100 comprises measurement module 10, processing module 20 and memory module 30.Store comparison data in memory module 30, described comparison data record the residual electricity of battery and the corresponding relation of open-circuit voltage.That is, if know the value of battery remaining electricity, the open-circuit voltage values of battery under this residual electricity can be found out by these comparison data; Otherwise, if know the open-circuit voltage values of battery, the residual charge value of battery under this open-circuit voltage can be found out by these comparison data.Described comparison data can be made by carrying out experiment collection to battery in advance.In the present embodiment, described comparison data present with the form of coordinate curve, as shown in Figure 2.In other embodiments, also can present in table form.The function of each module of internal resistance estimating apparatus 100 will be described in detail in figure 3.
The following describes the internal resistance estimation principle of internal resistance of cell estimating apparatus of the present invention and method.
Refer to Fig. 3, Figure 3 shows that Dai Weining (Thevenin) battery equivalent-circuit model.The terminal voltage equation that be can be derived from battery by Fig. 2 is: V (t)=E (t)+R
0i+u (t).Wherein, V (t) terminal voltage that is battery; The open-circuit voltage that E (t) is battery, R
0for the ohmic internal resistance of battery, I is the electric current flowing through battery.The polarization resistance R that u (t) is battery
1the voltage at two ends.Carry out at battery in the process of constant-current charge, namely carry out in the process of constant-current charge, with polarization resistance R in Fig. 2 with a predetermined current value
1electric capacity C in parallel can be considered open circuit.Therefore, now the terminal voltage V (t) of battery is: V (t)=E (t)+(R
0+ R
1) I.So, if the value of the terminal voltage V (t) of battery, open-circuit voltage E (t) and electric current I can be obtained, the internal resistance R=R of battery can be calculated
0+ R
1.
Refer to Fig. 4, the internal resistance of cell estimating and measuring method of better embodiment of the present invention comprises the steps:
Step S1: measurement module 10 battery carry out constant-current charge start time, measure the terminal voltage V (t) of battery and charging current I.
Step S2: processing module 20 obtains the residual electricity that battery starts when carrying out constant-current charge, i.e. initial residual electricity Q
1.
Step S3: search unit 22 according to described initial residual electricity and comparison data, finds out and described initial residual electricity Q
1corresponding initial open circuit voltage E1.
Step S4: computing unit 23 is according to described initial open circuit voltage E1, terminal voltage V (t), charging current I and formula V (t)=E (t)+(R
0+ R
1) I calculates the internal resistance of battery, E (t)=E1 in aforementioned formula.
Refer to Fig. 5, wherein, step S2 comprises following sub-step:
Step S21: the charge capacity △ Q that electric quantity metering unit 21 obtains in whole constant-current charge process according to described charging current I calculating battery.Electric quantity metering unit 21 can be one coulomb of calculation element or circuit, by carrying out Coulomb integral to charging current I, to obtain described charge capacity △ Q.
Step S22: measurement module 10 measures the open-circuit voltage E2 of battery after charging complete.That is, the open-circuit voltage E2 after whole charging process completes.In the present embodiment, in order to obtain more accurate measurement, after battery completes constant-current charge and leaves standstill a period of time, measurement module 10 measures open-circuit voltage values E2 again.
Step S23: search unit 22 and find out the residual electricity corresponding with this open-circuit voltage values E2 from comparison data, i.e. total electricity Q of battery
2.
Step S24: computing unit 23 is according to charge capacity △ Q, total electricity Q
2and formula △ Q=Q
2-Q
1calculate described initial residual electricity Q
1.
Described internal resistance of cell estimating apparatus and method estimate the internal resistance of cell by utilizing the parameters such as the voltage under battery constant-current charge state and electric current, under constant-current charge pattern, there is stable battery behavior due to battery and there is the circuit model of simplification, therefore, can be facilitated by described internal resistance of cell estimating apparatus and method and estimate the internal resistance of cell exactly.
Claims (6)
1. an internal resistance of cell estimating and measuring method, the method comprises the steps:
Battery carry out constant-current charge start time, measure the terminal voltage of battery and charging current;
Acquisition battery starts initial residual electricity when carrying out constant-current charge;
According to described initial residual electricity, record the comparison data of the residual electricity of battery and the corresponding relation of open-circuit voltage from one, find out the value of the initial open circuit voltage corresponding with described initial residual electricity; And
The internal resistance of battery is calculated according to the value of described initial open circuit voltage, terminal voltage and charging current.
2. internal resistance of cell estimating and measuring method as claimed in claim 1, is characterized in that, the step obtaining the initial residual electricity that battery starts when carrying out constant-current charge comprises following sub-step:
According to the charge capacity that described charging current calculating battery obtains in whole constant-current charge process;
Measure the open-circuit voltage of battery after charging complete;
From comparison data, find out the residual electricity corresponding with this open-circuit voltage, this residual electricity is called total electricity; And
Described initial residual electricity is calculated according to described charge capacity and total electricity.
3. internal resistance of cell estimating and measuring method as claimed in claim 2, it is characterized in that: calculating in the step of the charge capacity that battery obtains in whole constant-current charge process according to described charging current, obtain described charge capacity by carrying out Coulomb integral to described charging current.
4. an internal resistance of cell estimating apparatus, for estimating the internal resistance of a battery, is characterized in that, described internal resistance of cell estimating apparatus comprises:
Memory module, for the comparison data of the corresponding relation of the residual electricity and open-circuit voltage that store a record battery;
Measurement module, for carry out at battery constant-current charge start time, measure the terminal voltage of battery and charging current;
Processing module, for obtaining the initial residual electricity that battery starts when carrying out constant-current charge; Described processing module comprises:
Search unit, for according to described initial residual electricity, from described comparison data, find out the value of the initial open circuit voltage corresponding with described initial residual electricity; And
Computing unit, calculates the internal resistance of battery according to the value of described initial open circuit voltage, terminal voltage and charging current.
5. internal resistance of cell estimating apparatus as claimed in claim 4, it is characterized in that, described processing module also comprises:
Electric quantity metering unit, for calculating the charge capacity that battery obtains in whole constant-current charge process according to described charging current;
Described measurement module is also for measuring the open-circuit voltage of battery after charging complete;
Describedly search unit also for finding out the residual electricity corresponding with this open-circuit voltage from comparison data, this residual electricity is called total electricity; And
Described computing unit is also for calculating described initial residual electricity according to described charge capacity and total electricity.
6. internal resistance of cell estimating apparatus as claimed in claim 5, is characterized in that: described electric quantity metering unit obtains described charge capacity by carrying out Coulomb integral to described charging current.
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| CN105203850A (en) * | 2015-10-28 | 2015-12-30 | 北京新能源汽车股份有限公司 | Estimation method and system of internal resistance of battery and vehicle |
| CN105259795A (en) * | 2015-11-27 | 2016-01-20 | 中山大学 | Internal impedance parameter expansion method for power battery simulator |
| CN106908664A (en) * | 2015-12-22 | 2017-06-30 | 北京展讯高科通信技术有限公司 | Battery loop circuit impedance measuring method, device and mobile terminal |
| CN110018348A (en) * | 2018-01-09 | 2019-07-16 | 中天储能科技有限公司 | Lithium battery internal resistance measurement method and device |
| CN114371408A (en) * | 2022-01-26 | 2022-04-19 | 上海玫克生储能科技有限公司 | Estimation method of battery charge state, and extraction method and device of charging curve |
| CN116243197A (en) * | 2023-05-12 | 2023-06-09 | 国民技术股份有限公司 | Method and device for predicting SOH of battery |
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| CN110018348A (en) * | 2018-01-09 | 2019-07-16 | 中天储能科技有限公司 | Lithium battery internal resistance measurement method and device |
| CN110018348B (en) * | 2018-01-09 | 2021-07-20 | 中天储能科技有限公司 | Lithium battery internal resistance measuring method and device |
| CN114371408A (en) * | 2022-01-26 | 2022-04-19 | 上海玫克生储能科技有限公司 | Estimation method of battery charge state, and extraction method and device of charging curve |
| CN114371408B (en) * | 2022-01-26 | 2023-06-20 | 上海玫克生储能科技有限公司 | Method for estimating state of charge of battery, method and device for extracting charging curve |
| CN116243197A (en) * | 2023-05-12 | 2023-06-09 | 国民技术股份有限公司 | Method and device for predicting SOH of battery |
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