CN102759713B - A kind of energy content of battery efficiency test device and method of testing thereof - Google Patents

Abstract

The invention provides a kind of energy content of battery efficiency test device and method of testing thereof, comprise, with steady current, discharge and recharge is carried out to battery, measure the rechargeable energy under SOC value and discharge energy, calculate the energy efficiency of battery, compared with prior art eliminate the measurement to battery open circuit voltage, also can test in the process that electric motor car and energy-accumulating power station run.

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 reasonable employment battery, and the energy efficiency improving battery is that energy-accumulating power station and electric automobile further develop the problem that must solve.

Battery is when carrying out the mensuration of energy efficiency, need the discharge and recharge carrying out big current, traditional energy content of battery assay method adopts open-circuit voltage determination method, the method needs the open-circuit voltage measuring battery, but battery needs long-time leaving standstill to obtain open-circuit voltage, energy-accumulating power station and electric automobile, in operational process of being everlasting, cannot leave standstill for a long time, and therefore the method can not meet actual operation requirements.

Summary of the invention

Open-circuit voltage cannot be obtained in operational process for current electric automobile and energy-accumulating power station, and then the situation of energy content of battery efficiency cannot be detected, the invention provides a kind of can in electric automobile and energy-accumulating power station operational process the device of test battery energy efficiency and method of testing thereof.

A kind of energy content of battery efficiency test device, comprise constant flow module, acquisition module and control module, described constant flow module and acquisition module are electrically connected with battery respectively, described control module is electrically connected with acquisition module and constant flow module respectively, described constant flow module is used for controlling to carry out discharge and recharge with constant current versus cell according to the order of control module, described acquisition module is for measuring the real-time voltage value of battery in charge and discharge process and current SOC value and sending to described control module, the real-time voltage value that described control module is used for sending according to acquisition module calculates the rechargeable energy Ecn in charge and discharge process, energy efficiency η under discharge energy Edn and current SOC value _n, wherein,

Further, described constant flow module is used in time Tn, carrying out discharge and recharge with constant electric current I according to the order of control module to battery, and described control module is used for according to real-time voltage Ucn and Udn in charge and discharge process, utilizes formula calculate rechargeable energy, utilize formula calculate discharge energy.

A kind of energy content of battery Efficiency test method, described energy content of battery Efficiency test method comprises:

Steps A, under initial SOC value, in time Tn, charge or discharge are carried out to battery with steady current I;

Step B, measure current SOC value;

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

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

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

Step F, formula 1 is utilized to calculate the energy efficiency η of battery discharge and recharge under current SOC value _n:

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

Further, the method for described mensuration battery charging power Ecn comprises:

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

Step b, formula 2 is utilized to calculate rechargeable energy Ecn:

$\mathrm{Ecn}={\∫}_0^{T_n}\mathrm{UcnIdt}$ Formula 2.

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

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

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

$\mathrm{Edn}={\∫}_0^{T_n}\mathrm{UdnIdt}$ Formula 3.

Further, described test is carried out under temperature is 13 DEG C of-38 DEG C of environment.

Further, described SOC value carries out discharge and recharge with electricity Q1 to battery in 0%-30% interval, wherein Q1=5% × nominal capacity, with electricity Q2, discharge and recharge is carried out to battery in 30%-70% interval, wherein Q2=40% × nominal capacity, discharge and recharge is carried out with electricity Q3 in 70%-100% interval, wherein, Q3=5% × nominal capacity.

Further, the described time T1=Q1/I with electricity Q1, battery being carried out to discharge and recharge, carries out the time T2=Q2/I of discharge and recharge to battery with electricity Q2, with electricity Q3, battery is carried out to the time T3=Q3/I of discharge and recharge.

Further, described energy content of battery Efficiency test method also comprises step G: take SOC value as horizontal ordinate, and energy efficiency values is the corresponding relation curve that ordinate sets up SOC and energy efficiency.

The present invention carries out discharge and recharge with steady current to battery, detect the rechargeable energy in charge and discharge process and discharge energy, calculate the energy efficiency of battery, eliminate the measurement to battery open circuit voltage, also can test energy content of battery efficiency in the process that electric motor car and energy-accumulating power station run.

Accompanying drawing explanation

Accompanying drawing 1 is the schematic 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 that energy content of battery Efficiency test method of the present invention provides and the corresponding relation curve map of energy efficiency.

Embodiment

In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.

As shown in Figure 1, the invention provides a kind of energy content of battery efficiency test device, comprise constant flow module 1, acquisition module 2 and control module 3, described constant flow module 1 and acquisition module 2 are electrically connected with battery respectively, described control module 3 is electrically connected with acquisition module 2 and constant flow module 1 respectively, , described constant flow module 1 is for controlling to carry out discharge and recharge with constant current versus cell according to the order of control module 3, described acquisition module 2 is for measuring the real-time voltage value of battery in charge and discharge process and current SOC value and sending to described control module 3, described control module 3 calculates the rechargeable energy Ecn in charge and discharge process for the real-time voltage value sent according to acquisition module 2, energy efficiency η under discharge energy Edn and current SOC value _n, wherein, ${\mathrm{\η}}_n=\frac{\mathrm{Edn}}{\mathrm{Ecn}}\×100\%.$

Constant flow module 1 carries out discharge and recharge to battery with constant electric current I for the order according to control module 3 in time Tn, and described control module 3, for according to real-time voltage Ucn and Udn in charge and discharge process, utilizes formula calculate rechargeable energy, utilize formula calculate discharge energy.

As shown in Figure 2, the present invention also provides a kind of energy content of battery Efficiency test method, and described energy content of battery Efficiency test method comprises:

Steps A, under initial SOC value, in time Tn, charge or discharge are carried out to battery with steady current I;

Step B, measure current SOC value;

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

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

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

Step F, formula 1 is utilized to calculate the energy efficiency η n of battery discharge and recharge under current SOC value:

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

In a kind of embodiment provided by the invention, with constant electric current I, discharge and recharge is carried out to battery, the value of electric current I was determined by the nominal capacity of battery and the whole charge and discharge process of setting complete required time, the nominal capacity of battery is the capacity of battery, nominal capacity (Ah)=electric current (A) × time (h), this is known to the skilled person, such as, nominal capacity is the battery of 50Ah, be set in discharge and recharge in 1 hour complete, then charging and discharging currents is 50A, and namely constant electric current I is 50A.

Be 0%-30% interval at SOC, with electricity Q1, battery is charged, wherein Q1=5% × nominal capacity, duration of charging T1=Q1/I, within the scope of this, the polarization resistance change of battery is little, adopts the electricity of the nominal capacity of 5% less to battery carry out the charging energy error that can make to test out.With steady current I, the battery that initial SOC value is zero is charged, often through T1 after a while, the SOC value of battery just increases by 5%, measure the rechargeable energy Ecn in each 5% interval, until battery SOC reaches 30%, the method being 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, formula 2 is utilized to calculate charge capacity Ecn:

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

Be in 30%-70% interval at SOC, with electricity Q2, battery charged, wherein Q2=40% × nominal capacity, duration of charging T2=Q2/I, elapsed time T2, battery SOC is 30% be increased to 70% by initial value, and the method 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, formula 3 is utilized to calculate charge capacity Ec7:

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

Be 70%-100% interval at SOC, with electricity Q3, battery is charged, wherein Q3=5% × nominal capacity, duration of charging T3=Q3/I, often through T3 after a while, the SOC value of battery just increases by 5%, measures the rechargeable energy Ecn in each 5% interval, until battery SOC reaches 100%, the method being 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, formula 4 is utilized to calculate charge capacity Ecn:

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

With constant electric current I, battery is discharged again after charging complete, be 70%-100% interval at battery electric quantity, with electricity Q3, battery is discharged, discharge time is T3, determine electric current I with constant the battery that initial SOC value is 100% is discharged, often through T3 after a while, the SOC value of battery just declines 5%, measure the discharge energy Edn in each 5% interval, until battery SOC reaches 70%, the method being determined at SOC discharge energy Edn (n=8,9,10,11,12,13) in each 5% interval comprises:

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

Step b, formula 5 is utilized to calculate charge capacity Edn:

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

Be 30%-70% interval at SOC, discharge to battery with electricity Q2, discharge time is T2, elapsed time T2, and battery SOC is 70% drop to 30% by initial value, and the method measuring battery discharge energy Ed7 in this SOC interval comprises:

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

Step b, formula 6 is utilized to calculate charge capacity Ed7:

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

Be 0%-30% interval at SOC, with electricity Q1, battery is discharged, discharge time is T1, often through T1 after a while, the SOC value of battery just declines 5%, measure the discharge energy Edn in each 5% interval, until battery SOC reaches 0%, the method being determined at SOC discharge energy Edn (n=1,2,3,4,5,6) in each 5% interval comprises:

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

Step b, formula 7 is utilized to calculate charge capacity Edn:

$\mathrm{Edn}={\∫}_0^{T_1}\mathrm{UdnIdt}$ Formula 6.

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

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

In the present embodiment, the interval value of battery SOC is 0-30%, 30%-70%, 70%-100%, charge/discharge electricity amount is set to the nominal capacity of 5% and the nominal capacity of 40%, just as a preferred version, other interval value can be selected in actual test process, also charge/discharge electricity amount can be set according to actual needs, such as, can 0%-20% be selected, 20%-80%, 80%-100% is interval, charge/discharge electricity amount carries out discharge and recharge at 0%-20% and 80%-100% interval electricity of 2% × nominal capacity that adopts, discharge and recharge is carried out at 20%-80% interval electricity of 30% × nominal capacity that adopts.

The energy content of battery method of testing that the present embodiment describes is carried out under temperature is 13 DEG C of-38 DEG C of environment.

As shown in Figure 3, setting up SOC-energy efficiency plane coordinate system, take SOC as horizontal ordinate, and energy efficiency is ordinate, by the energy content of battery efficiency eta tested out _nthe point of (n=1,2,3 ... 13) is painted into this planimetric coordinates and fastens under the SOC value of correspondence, with level and smooth curve, point is coupled together again, namely SOC-energy efficiency corresponding relation curve is obtained, the situation of change of battery in energy efficiency corresponding to each SOC value and the interval self-energy efficiency of each SOC can be drawn according to this curve, better understand battery performance.

By above embodiment, with steady current, discharge and recharge is carried out to battery, calculate rechargeable energy and discharge energy, draw the energy efficiency of battery, eliminate the measurement to battery open circuit voltage, also can test energy content of battery efficiency in the process that electric motor car and energy-accumulating power station run.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. an energy content of battery efficiency test device, comprise constant flow module, acquisition module and control module, described constant flow module and acquisition module are electrically connected with battery respectively, described control module is electrically connected with acquisition module and constant flow module respectively, it is characterized in that, described constant flow module is used for controlling to carry out discharge and recharge with constant current versus cell according to the order of control module, described acquisition module is for measuring the real-time voltage value of battery in charge and discharge process and current SOC value and sending to described control module, the real-time voltage value that described control module is used for sending according to acquisition module calculates the rechargeable energy Ecn in charge and discharge process, energy efficiency η under discharge energy Edn and current SOC value _n, wherein,

2. energy content of battery efficiency test device according to claim 1, it is characterized in that, described constant flow module is used in time Tn, carrying out discharge and recharge with constant electric current I according to the order of control module to battery, described control module is used for according to real-time voltage Ucn and Udn in charge and discharge process, utilizes formula calculate rechargeable energy, utilize formula calculate discharge energy.

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

Steps A, under initial SOC value, in time Tn, charge or discharge are carried out to battery with steady current I;

Step B, measure current SOC value;

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

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

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

Step F, formula 1 is utilized to calculate the energy efficiency η of battery discharge and recharge under current SOC value _n:

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

Wherein, described SOC value carries out discharge and recharge with electricity Q1 to battery in 0%-30% interval, wherein Q1=5% × nominal capacity, with electricity Q2, discharge and recharge is carried out to battery in 30%-70% interval, wherein Q2=40% × nominal capacity, discharge and recharge is carried out with electricity Q3 in 70%-100% interval, wherein, Q3=5% × nominal capacity.

4. energy content of battery Efficiency test method according to claim 3, is characterized in that, the method for described mensuration battery charging power Ecn comprises:

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

Step b, formula 2 is utilized to calculate rechargeable energy Ecn:

$\mathrm{Ecn}={\∫}_0^{T_n}\mathrm{UcnIdt}$ Formula 2.

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

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

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

$\mathrm{Edn}={\∫}_0^{T_n}\mathrm{UdnIdt}$ Formula 3.

6. energy content of battery Efficiency test method according to claim 3, is characterized in that, described test is carried out under temperature is 13 DEG C of-38 DEG C of environment.

7. energy content of battery Efficiency test method according to claim 6, it is characterized in that, the described time T1=Q1/I with electricity Q1, battery being carried out to discharge and recharge, carries out the time T2=Q2/I of discharge and recharge to battery with electricity Q2, with electricity Q3, battery is carried out to the time T3=Q3/I of discharge and recharge.

8. energy content of battery Efficiency test method according to claim 3, is characterized in that, described energy content of battery Efficiency test method also comprises step G: take SOC value as horizontal ordinate, and energy efficiency values is the corresponding relation curve that ordinate sets up SOC and energy efficiency.