CN102759713A - Battery energy efficiency testing device and testing method thereof - Google Patents

Abstract

The invention provides a battery energy efficiency testing device and a testing method thereof. The testing method comprises the steps of charging and discharging a battery by using a constant current, determining the charging energy and the discharging energy of the battery under a state of charge (SOC) value and calculating the energy efficiency of the battery. Compared with the prior art, the testing method has the advantages that the measurement of an open-circuit voltage of the battery is neglected, and electric vehicles and energy storage power stations can be tested during running processes.

Description

A kind of energy content of battery efficiency test device and method of testing thereof

Technical field

The present invention relates to a kind of energy content of battery efficiency test device and method of testing thereof.

Background technology

Electric battery is the key components of energy-accumulating power station and electric automobile, how rationally to use battery, and the energy efficiency that improves battery is the problem that energy-accumulating power station and electric automobile further develop the necessary solution of institute.

Battery is when carrying out the mensuration of energy efficiency; Need carry out discharging and recharging of big electric current, traditional energy content of battery assay method adopts the open-circuit voltage determination method, and the method need be measured the open-circuit voltage of battery; But need leaving standstill just for a long time, battery can obtain open-circuit voltage; Energy-accumulating power station and electric automobile can't leave standstill in the operational process of being everlasting for a long time, so this method can not satisfy actual request for utilization.

Summary of the invention

In operational process, can't obtain open-circuit voltage to present electric automobile and energy-accumulating power station; And then can't detect the situation of energy content of battery efficient, the present invention provide a kind of can be in electric automobile and energy-accumulating power station operational process the device and the method for testing thereof of test battery energy efficiency.

A kind of energy content of battery efficiency test device; Comprise constant flow module, acquisition module and control module; Said constant flow module and acquisition module are electrically connected with battery respectively; Said control module is electrically connected with acquisition module and constant flow module respectively; Said constant flow module is used for battery being discharged and recharged with constant electric current according to the order control of control module; Said acquisition module is used for measuring battery in the real-time voltage value and the current SOC value of charge and discharge process and send to said control module, and the real-time voltage value that said control module is used for sending according to acquisition module is calculated the energy efficiency η under rechargeable energy Ecn, discharge energy Edn and the current SOC value of charge and discharge process _n, wherein,

Further; Said constant flow module is used in time T n, battery being discharged and recharged with constant electric current I according to the order of control module; Said control module is used for real-time voltage Ucn and the Udn according to charge and discharge process; Utilize formula

to calculate rechargeable energy, utilize formula

to calculate discharge energy.

A kind of energy content of battery efficiency test method, said energy content of battery efficiency test method comprises:

Steps A, under initial SOC value, in time T n, battery is carried out charge or discharge with steady current I;

Step B, the current SOC value of mensuration;

Rechargeable energy Ecn in step C, the described charging process of determination step A or the discharge energy Edn in the discharge process;

Step D, battery is discharged in identical time T n with steady current I again or charge;

Discharge energy Edn in step e, the described discharge process of determination step D or the rechargeable energy Ecn in the charging process;

Step F, the energy efficiency η that utilizes formula 1 counting cell under current SOC value, to discharge and recharge _n:

${\mathrm{\η}}_n=\frac{\mathrm{Edn}}{\mathrm{Ecn}}\×100\%$ Formula 1.

Further, the method for said mensuration battery charge energy E cn comprises:

Step a, the real-time voltage Ucn of measurement battery in charging process;

Step b, utilize formula 2 to calculate rechargeable energy Ecn:

$\mathrm{Ecn}={\∫}_0^{T_n}U{\mathrm{CnId}}_t$ Formula 2.

Further, the method for said mensuration battery discharging energy Edn comprises:

Step (1), the real-time voltage Udn of measurement battery in discharge process;

Step (2), utilize formula 3 to calculate discharge energy Edn:

$\mathrm{Edn}={\∫}_0^{T_n}U{\mathrm{DnId}}_t$ Formula 3.

Further, said test is to carry out under 13 ℃ of-38 ℃ of environment in temperature.

Further; Said SOC value discharges and recharges battery with electric weight Q1 in the 0%-30% interval, and wherein Q1=5% * nominal capacity discharges and recharges battery with electric weight Q2 in the 30%-70% interval; Q2=40% * nominal capacity wherein; Discharge and recharge with electric weight Q3 in the 70%-100% interval, wherein, Q3=5% * nominal capacity.

Further, the said time T 1=Qc1/I that battery is discharged and recharged with electric weight Q1, the time T 2=Qc2/I that battery is discharged and recharged with electric weight Q2, the time T 3=Qc3/I that battery is discharged and recharged with electric weight Q3.

Further, said energy content of battery efficiency test method also comprises step G: with the SOC value is horizontal ordinate, and the energy efficiency value is the corresponding relation curve that ordinate is set up SOC and energy efficiency.

The present invention discharges and recharges battery with steady current; Detect rechargeable energy and discharge energy in the charge and discharge process; The energy efficiency of counting cell has been saved the measurement to battery open circuit voltage, in the process of electric motor car and energy-accumulating power station operation, also can test energy content of battery efficient.

Description of drawings

Accompanying drawing 1 is the synoptic diagram of energy content of battery efficiency test device of the present invention.

Accompanying drawing 2 is process flow diagrams of energy content of battery efficiency test method of the present invention.

Accompanying drawing 3 is the SOC of a kind of embodiment of providing of energy content of battery efficiency test method of the present invention and the corresponding relation curve map of energy efficiency.

Embodiment

Clearer for technical matters, technical scheme and beneficial effect that the present invention is solved, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

Shown in accompanying drawing 1; The present invention provides a kind of energy content of battery efficiency test device; Comprise constant flow module 1, acquisition module 2 and control module 3; Said constant flow module 1 is electrically connected with battery respectively with acquisition module 2; Said control module 3 is electrically connected with acquisition module 2 and constant flow module 1 respectively,, said constant flow module 1 is used for battery being discharged and recharged with constant electric current according to the order control of control module 3; Said acquisition module 2 is used for measuring battery in the real-time voltage value and the current SOC value of charge and discharge process and send to said control module 3, and said control module 3 is used for calculating the energy efficiency η under rechargeable energy Ecn, discharge energy Edn and the current SOC value of charge and discharge process according to the real-time voltage value that acquisition module 2 sends _n, wherein,

Constant flow module 1 is used in time T n, battery being discharged and recharged with constant electric current I according to the order of control module 3; Said control module 3 is used for real-time voltage Ucn and the Udn according to charge and discharge process; Utilize formula

to calculate rechargeable energy, utilize formula

to calculate discharge energy.

The constant flow module 1 main constant-current circuit control steady current that adopts, the acquisition module 2 main voltage collection circuits that adopt are realized the collection to real-time voltage, control module is mainly through the single-chip microcomputer energy efficiency.

Shown in accompanying drawing 2, the present invention also provides a kind of energy content of battery efficiency test method, and said energy content of battery efficiency test method comprises:

Steps A, under initial SOC value, in time T n, battery is carried out charge or discharge with steady current I;

Step B, the current SOC value of mensuration;

Rechargeable energy Ecn in step C, the described charging process of determination step A or the discharge energy Edn in the discharge process;

Step D, battery is discharged in identical time T n with steady current I again or charge;

Discharge energy Edn in step e, the described discharge process of determination step D or the rechargeable energy Ecn in the charging process;

Step F, the energy efficiency η that utilizes formula 1 counting cell under current SOC value, to discharge and recharge _n:

${\mathrm{\η}}_n=\frac{\mathrm{Edn}}{\mathrm{Ecn}}\×100\%$ Formula 1.

Among a kind of embodiment provided by the invention, with constant electric current I battery is discharged and recharged, the value of electric current I was confirmed by the whole charging and discharging process of the nominal capacity of battery and setting required time that finishes; The nominal capacity of battery is the capacity of battery, nominal capacity (Ah)=electric current (A) * time (h), and this is as well known to those skilled in the art; For example, nominal capacity is the battery of 50Ah, is set in to discharge and recharge in 1 hour to finish; Then charging and discharging currents is 50A, and promptly constant electric current I is 50A.

At SOC is that 0%-30% is interval; Q1 charges to battery with electric weight; Q1=5% * nominal capacity wherein; Duration of charging T1=Qc1/I, the polarization resistance of battery changes not quite in this scope, and the electric weight of the nominal capacity of employing 5% charges to battery and can make the energy error that tests out less.Serves as that zero battery charges with steady current I to initial SOC value; Every warp is T1 after a while; The SOC value of battery just increases by 5%; Measure each 5% interval interior rechargeable energy Ecn, reach 30% up to battery SOC, the method that is determined at SOC rechargeable energy Ecn (n=1,2,3,4,5,6) in each 5% interval comprises:

Step a, measurement battery real-time voltage Ucn (n=1,2,3,4,5,6) in charging process;

Step b, utilize formula 2 to calculate charge capacity Ecn:

$\mathrm{Ecn}={\∫}_0^{T1}{\mathrm{UcnId}}_t$ (n=1,2,3,4,5,6) formula 2.

In SOC was the 30%-70% interval, Qc2 charged to battery with electric weight, wherein Q2=40% * nominal capacity; Duration of charging T2=Qc2/I; Elapsed time T2, battery SOC are 30% to increase to 70% by initial value, and the method for measuring the rechargeable energy Ec7 of battery in this SOC interval comprises:

Step a, measurement battery real-time voltage Uc7 in charging process;

Step b, utilize formula 3 to calculate charge capacity Ec7:

$\mathrm{Ec}7={\∫}_0^{T2}{\mathrm{Uc}7\mathrm{Id}}_t$ Formula 3.

At SOC is that 70%-100% is interval, and Q3 charges to battery with electric weight, wherein Q3=5% * nominal capacity; Duration of charging T3=Qc3/I; Every warp is T3 after a while, and the SOC value of battery just increases by 5%, measures each 5% interval interior rechargeable energy Ecn; Reach 100% up to battery SOC, the method that is determined at SOC rechargeable energy Ecn (n=8,9,10,11,12,13) in each 5% interval comprises:

Step a, measurement battery real-time voltage Ucn (n=8,9,10,11,12,13) in charging process;

Step b, utilize formula 4 to calculate charge capacity Ecn:

$\mathrm{Ecn}={\∫}_0^{T3}{\mathrm{UcnId}}_t$ (n=8,9,10,11,12,13) formula 4.

Charging is discharged to battery with constant electric current I after accomplishing again; At battery electric quantity is that 70%-100% is interval, and Q3 discharges to battery with electric weight, and be T3 discharge time; To decide electric current I be that 100% battery discharges to initial SOC value with constant; Every warp is T3 after a while, and the SOC value of battery just descends 5%, measures each 5% interval interior discharge energy Edn; Reach 70% up to battery SOC, the method that is determined at SOC discharge energy Edn (n=13,12,11,10,9,8) in each 5% interval comprises:

Step a, measurement battery real-time voltage Udn (n=13,12,11,10,9,8) in discharge process;

Step b, utilize formula 5 to calculate charge capacity Edn:

$\mathrm{Edn}={\∫}_0^{T_3}U{\mathrm{DnId}}_t$ (n=13,12,11,10,9,8) formula 5.

At SOC is that 30%-70% is interval, and Q2 discharges to battery with electric weight, and be T2 discharge time, and elapsed time T2, battery SOC are 70% to drop to 30% by initial value, and the method for measuring battery discharge energy Ed7 in this SOC interval comprises:

Step a, measurement battery real-time voltage Ud7 in discharge process;

Step b, utilize formula 6 to calculate charge capacity Ed7:

$\mathrm{Ed}7={\∫}_0^{T2}{\mathrm{Ud}7\mathrm{Id}}_t$ Formula 6.

At SOC is that 0%-30% is interval; Q1 discharges to battery with electric weight, and be T1 discharge time, and every warp is T1 after a while; The SOC value of battery just descends 5%; Measure each 5% interval interior discharge energy Edn, reach 0% up to battery SOC, the method that is determined at SOC discharge energy Edn (n=6,5,4,3,2,1) in each 5% interval comprises:

Step a, measurement battery real-time voltage Udn (n=6,5,4,3,2,1) in discharge process;

Step b, utilize formula 7 to calculate charge capacity Edn:

$\mathrm{Edn}={\∫}_0^{T1}{\mathrm{UdnId}}_t$ (n=6,5,4,3,2,1) formula 6.

Calculate battery at the interval charge-discharge energy of each SOC, the energy content of battery efficient of utilizing formula 1 to calculate under the current SOC value:

${\mathrm{\η}}_n=\frac{\mathrm{Edn}}{\mathrm{Ecn}}\×100\%$ (n＝1、2、3、......13)。

The interval value of battery SOC is 0-30% in the present embodiment, 30%-70%, 70%-100%; Charge/discharge electricity amount is made as 5% nominal capacity and 40% nominal capacity, just as a preferred version, in actual test process, can select other interval value; Also can set charge/discharge electricity amount according to actual needs, for example, can select 0%-20%; 20%-80%; 80%-100% is interval, and charge/discharge electricity amount discharges and recharges at 0%-20% and the interval electric weight of 2% * nominal capacity that adopts of 80%-100%, discharges and recharges at the interval electric weight of 30% * nominal capacity that adopts of 20%-80%.

The energy content of battery method of testing that present embodiment is described is to carry out under 13 ℃ of-38 ℃ of environment in temperature.

Shown in accompanying drawing 3, set up SOC-energy efficiency plane coordinate system, with SOC horizontal ordinate, energy efficiency is an ordinate, with the energy content of battery efficiency eta that tests out _n(n=1,2,3 ... 13) point under the SOC of correspondence value, be painted into this planimetric coordinates and fasten; With level and smooth curve point is coupled together again; Promptly obtain SOC-energy efficiency corresponding relation curve; Can draw the situation of change of battery according to this curve, better understand battery performance in each SOC value corresponding energy efficient and the interval self-energy efficient of each SOC.

Through above embodiment; With steady current battery is discharged and recharged, calculate rechargeable energy and discharge energy, draw the energy efficiency of battery; Saved measurement, in the process of electric motor car and energy-accumulating power station operation, also can test energy content of battery efficient to battery open circuit voltage.

The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. energy content of battery efficiency test device; Comprise constant flow module, acquisition module and control module; Said constant flow module and acquisition module are electrically connected with battery respectively; Said control module is electrically connected with acquisition module and constant flow module respectively; It is characterized in that; Said constant flow module is used for battery being discharged and recharged with constant electric current according to the order of control module control, and said acquisition module is used for measuring battery in the real-time voltage value and the current SOC value of charge and discharge process and send to said control module, the energy efficiency η under rechargeable energy Ecn, discharge energy Edn and the current SOC value of the real-time voltage value calculating charge and discharge process that said control module is used for sending according to acquisition module _n, wherein,

2. energy content of battery proving installation according to claim 1; It is characterized in that; Said constant flow module is used in time T n, battery being discharged and recharged with constant electric current I according to the order of control module; Said control module is used for real-time voltage Ucn and the Udn according to charge and discharge process; Utilize formula

to calculate rechargeable energy, utilize formula

to calculate discharge energy.

3. an energy content of battery efficiency test method is characterized in that, said energy content of battery efficiency test method comprises:

Steps A, under initial SOC value, in time T n, battery is carried out charge or discharge with steady current I;

Step B, the current SOC value of mensuration;

Rechargeable energy Ecn in step C, the described charging process of determination step A or the discharge energy Edn in the discharge process;

Step D, battery is discharged in identical time T n with steady current I again or charge;

Discharge energy Edn in step e, the described discharge process of determination step D or the rechargeable energy Ecn in the charging process;

Step F, the energy efficiency η that utilizes formula 1 counting cell under current SOC value, to discharge and recharge _n:

${\mathrm{\η}}_n=\frac{\mathrm{Edn}}{\mathrm{Ecn}}\×100\%$ Formula 1.

4. energy content of battery efficiency test method according to claim 3 is characterized in that, the method for said mensuration battery charge energy E cn comprises:

Step a, the real-time voltage Ucn of measurement battery in charging process;

Step b, utilize formula 2 to calculate rechargeable energy Ecn:

$\mathrm{Ecn}={\∫}_0^{T_n}U{\mathrm{CnId}}_t$ Formula 2.

5. energy content of battery efficiency test method according to claim 3 is characterized in that, the method for said mensuration battery discharging energy Edn comprises:

Step (1), the real-time voltage Udn of measurement battery in discharge process;

Step (2), utilize formula 3 to calculate discharge energy Edn:

$\mathrm{Edn}={\∫}_0^{T_n}U{\mathrm{DnId}}_t$ Formula 3.

6. energy content of battery efficiency test method according to claim 3 is characterized in that, said test is to carry out under 13 ℃ of-38 ℃ of environment in temperature.

7. energy content of battery efficiency test method according to claim 3 is characterized in that said SOC value discharges and recharges battery with electric weight Q1 in the 0%-30% interval; Q1=5% * nominal capacity wherein; Battery is discharged and recharged with electric weight Q2 in the 30%-70% interval, wherein Q2=40% * nominal capacity discharges and recharges with electric weight Q3 in the 70%-100% interval; Wherein, Q3=5% * nominal capacity.

8. energy content of battery efficiency test method according to claim 7; It is characterized in that; The said time T 1=Qc1/I that battery is discharged and recharged with electric weight Q1, the time T 2=Qc2/I that battery is discharged and recharged with electric weight Q2, the time T 3=Qc3/I that battery is discharged and recharged with electric weight Q3.

9. energy content of battery efficiency test method according to claim 2 is characterized in that, said energy content of battery efficiency test method also comprises step G: with the SOC value is horizontal ordinate, and the energy efficiency value is the corresponding relation curve that ordinate is set up SOC and energy efficiency.

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