CN102608540A - Coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of power battery - Google Patents

Abstract

The invention discloses a coulomb efficiency measuring method used for SOC (system-on-chip) evaluation of a power battery, relates to the technical field of power batteries or power battery pack management and aims at solving the problems that in the prior art, when the coulomb efficiency is calculated, the capacitance range of the battery in the practical use is not considered, and the coulomb efficiency is not accurate caused by the self temperature change of the battery in charging and discharging process and the like. The method comprises the following specific steps: conducting HPPC (hybrid pulse-power capability) test on a battery to be detected, and recording a voltage time curve and a current time curve in the HPPC test; calculating the relation curve of pulse power capacity and charging electric quantity according to the obtained voltage time curve and current time curve, and calculating the minimum discharging depth and the maximum discharging depth according to the curve; calculating the coulomb efficiency of middle discharging depth; charging the battery to the middle discharging depth, charging for n times to keep the work condition, discharging the battery completely, and calculating the coulomb efficiency of the battery to be detected. The method disclosed by the invention is used for measuring the coulomb efficiency of batteries in the fields of electric automobiles, renewable energy sources, and large-scale energy storage.

Description

A kind of enclosed pasture efficiency test method that is used for electrokinetic cell SOC estimation

Technical field

The present invention relates to electrokinetic cell or power battery group management technical field for a kind of enclosed pasture efficiency test method that is used for electrokinetic cell SOC estimation.

Background technology

At present, people's pay attention to day by day is to the protection of environment and the use effectively and reasonably of the energy.Therefore, new-energy automobiles efficient, energy-saving and environmental protection just become the development trend of automobile industry.In order to ensure the execution of electrokinetic cell safety and integrated vehicle control tactics, the research and development of power battery management system are particularly important.Wherein SOC (dump energy number percent) is as the topmost influence factor of battery behavior, is one of focus and difficult point of batteries management system research in recent years.

The ampere-hour measurement Law is the battery SOC method of estimation that present electric automobile the most often uses, and its principle is the Integral Estimation SOC through load current, is simple and easy to, algorithm stablely, and formula is following:

$\mathrm{SOC}={\mathrm{SOC}}_0-\frac{1}{C_A}{\∫}_{t_0}^t\mathrm{\ηIdt}$

SOC in the formula ₀Be preliminary examination SOC, C _ABe the battery active volume, η is an enclosed pasture efficient.Can find out that by above formula the accurate calculating of coulomb efficient directly influences the computational accuracy of ampere-hour method.

Because the existence of internal resistance, any charging of battery, discharge process all have the loss of electric weight, when the SOC of estimating battery, must consider enclosed pasture efficient." definition enclosed pasture efficient is in the electric automobile battery test handbook: use discharge current I at it in United States advanced battery federation (USABC) _dThe electric weight Q that from battery, emits _dWith use charging current I _cMake battery SOC return to the preceding needed electric weight Q of state of discharge _cThe ratio.Also have document to propose the notion of conversion enclosed pasture efficient, it is normalized to the constant current charge-discharge process with battery time-dependent current charge and discharge process, and core concept is enclosed pasture efficient unification to the 3 hour multiplying power discharging electric current C with different electric currents ₃On/3 the enclosed pasture efficient.But all do not consider the range of capacity of battery when reality is used through the enclosed pasture efficient that above definition calculates; Battery temperature of self in charge and discharge process can change and cause a coulomb efficiency change; Thereby the accuracy of influence enclosed pasture efficient, it is inaccurate to cause SOC to estimate.

Summary of the invention

The object of the invention is not consider the range of capacity of battery when reality is used when prior art is calculated enclosed pasture efficient in order to solve; Battery temperature of self in charge and discharge process can change and cause a coulomb efficiency change; Thereby the accuracy of influence enclosed pasture efficient; Cause SOC to estimate inaccurate problem, the present invention realizes through following steps:

Step 1: select the interior temperature of a certain electrokinetic cell operating temperature range to be measured as temperature to be measured, following steps two to step 7 is all carried out under this temperature conditions to be measured;

Step 2: battery to be detected is carried out the test of combined power pulse characteristic; Volt-time curve and current-time curvel in the test of record combined power pulse characteristic; Calculate corresponding charge pulse power ability and discharge pulse power capability and obtain charge pulse power ability and the relation curve of charge capacity and the relation curve of discharge pulse power capability and charge capacity; The charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and charge capacity is minimum depth of discharge, and the charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and discharge electricity amount is maximum depth of discharge;

Step 3: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived minimum depth of discharge, the electric weight that charges into is Q _MinDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MinDOD-dis, calculate the average enclosed pasture of minimum discharge power efficiency eta according to minimum depth of discharge electric weight that charges into and the electric weight of emitting _MinDOD, computing formula does

${\mathrm{\η}}_{\mathrm{MinDOD}}=\frac{Q_{\mathrm{MinDOD}-\mathrm{dis}}}{Q_{\mathrm{MinDOD}-\mathrm{cha}}}\×100\%;$

Step 4: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived maximum depth of discharge, the electric weight that charges into is Q _MaxDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MaxDOD-dis, the electric weight that charges into and emit according to maximum depth of discharge calculates the average enclosed pasture of maximum discharge power efficiency eta _MidDOD, computing formula is: ${\mathrm{\η}}_{\mathrm{MaxDOD}}=\frac{Q_{\mathrm{MaxDOD}-\mathrm{Dis}}}{Q_{\mathrm{MaxDOD}-\mathrm{Cha}}}\×100\%;$

Step 5: the mean value of the charge capacity of minimum depth of discharge and maximum depth of discharge is middle depth of discharge, depth of discharge enclosed pasture efficient estimated value η in the middle of a minimum discharge power average enclosed pasture efficient of calculating respectively according to step 3 and step 4 and the average enclosed pasture of a maximum discharge power efficiency calculation go out _MidDOD, computing formula does

Step 6: the constant current to be no more than safety current is arrived middle depth of discharge with battery charge, and the electric weight that charges into is Q _MidDOD-cha, static one hour, doing n charging and keeping operating mode, 10＜n＜1000 wherein, total charge volume of calculating the maintenance operating mode of charging for n time is Q _{Power-sustain-cha}With total discharge capacity be Q _{Power-sustain-dis}, static one hour, with battery emptying, calculate the electric weight Q that emits with the constant current that is no more than safety current _MidDOD-dis

Step 7: arrive step 6 according to step 3, the enclosed pasture efficiency eta of counting cell in actual usable range, computing formula is:

$\mathrm{\η}=(1-\frac{{\mathrm{\η}}_{\mathrm{MidDOD}}\×Q_{\mathrm{MidDOD}-\mathrm{cha}}-Q_{\mathrm{MidDOD}-\mathrm{dis}}}{Q_{\mathrm{Power}-\mathrm{sustain}-\mathrm{cha}}})\×100\%.$

The enclosed pasture efficient that the present invention utilizes the charging of battery in specific usable range to keep operating mode to come counting cell; Reached the enclosed pasture efficient of counting cell in the actual use; Utilize when battery operated ampere-hour method estimation SOC that accurate data is provided; Guarantee battery accurate estimation SOC in the process of real vehicle operation

The beneficial effect of this method is:

One, considered battery applied scope when the actual use of new forms of energy car, guaranteed that the enclosed pasture efficient that calculates satisfies the real vehicle request for utilization.

Two, this method is utilized the enclosed pasture efficient that the charging of battery in specific usable range keeps operating mode to come counting cell, so this method computing velocity is fast, and is simple, easily operation.

Three, this method has been considered the operating position of battery under condition of different temperatures, and therefore wideer temperature applicable range is arranged.

Description of drawings

Fig. 1 is for measuring the process flow diagram of electrokinetic cell enclosed pasture efficient; Fig. 2 is the volt-time curve and the current-time curvel of combined power pulse characteristic test in the embodiment two; Fig. 3 is the relation curve of pulse power ability and battery electric quantity in the embodiment two; Fig. 4 is the powertrace that charging keeps operating mode in the embodiment two; Fig. 5 is the volt-time curve and the current-time curvel of step 6 in the embodiment two; Fig. 6 is volt-time curve and the current-time curvel that 100 chargings keep operating mode among Fig. 5.

Embodiment

Below in conjunction with Fig. 1 to Fig. 6 embodiment of the present invention is described;

Embodiment one: as shown in Figure 1, the efficiency test of electrokinetic cell enclosed pasture is carried out through following steps:

Step 1: select a certain operating temperature range to be-20 ℃-60 ℃ electrokinetic cell to be measured, select temperature in this temperature range as temperature to be measured, following steps two to step 7 is all carried out under temperature conditions to be measured;

Step 2: battery to be detected is carried out the test of combined power pulse characteristic, and with battery emptying electricity to be detected, static one hour is the m of available battery charge with the battery charge electric weight with the constant current that is no more than safety current ₁% carries out the pulse power test then, and static one hour is the m of available battery charge with battery to electric weight with the constant-current charge that is no more than safety current again ₂% carries out the test of combined power pulse characteristic, and so circulation is the m of available battery charge up to charge capacity _a%, wherein: m ₁＜m ₂＜m _a, 0＜m ₁＜15,85＜m _a＜100, the test of combined power pulse characteristic is finished in 5＜a＜50.Volt-time curve and current-time curvel in the test of record combined power pulse characteristic; Calculate corresponding charge pulse power ability and discharge pulse power capability and obtain charge pulse power ability and the relation curve of charge capacity and the relation curve of discharge pulse power capability and charge capacity; The charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and charge capacity is minimum depth of discharge, and the charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and discharge electricity amount is maximum depth of discharge;

Step 3: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived minimum depth of discharge, the electric weight that charges into is Q _MinDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MinDOD-dis, calculate the average enclosed pasture of minimum discharge power efficiency eta according to minimum depth of discharge electric weight that charges into and the electric weight of emitting _MinDOD, computing formula does

${\mathrm{\η}}_{\mathrm{MinDOD}}=\frac{Q_{\mathrm{MinDOD}-\mathrm{dis}}}{Q_{\mathrm{MinDOD}-\mathrm{cha}}}\×100\%;$

Step 4: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived maximum depth of discharge, the electric weight that charges into is Q _MaxDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MaxDOD-dis, the electric weight that charges into and emit according to maximum depth of discharge calculates the average enclosed pasture of maximum discharge power efficiency eta _MidDOD, computing formula is: ${\mathrm{\η}}_{\mathrm{MaxDOD}}=\frac{Q_{\mathrm{MaxDOD}-\mathrm{Dis}}}{Q_{\mathrm{MaxDOD}-\mathrm{Cha}}}\×100\%;$

Step 5: the mean value of the charge capacity of minimum depth of discharge and maximum depth of discharge is middle depth of discharge, depth of discharge enclosed pasture efficient estimated value η in the middle of a minimum discharge power average enclosed pasture efficient of calculating respectively according to step 3 and step 4 and the average enclosed pasture of a maximum discharge power efficiency calculation go out _MidDOD, computing formula does

Step 6: the constant current to be no more than safety current is arrived middle depth of discharge with battery charge, and the electric weight that charges into is Q _MidDOD-cha, static one hour, doing n charging and keeping operating mode, 10＜n＜1000 wherein, total charge volume of calculating the maintenance operating mode of charging for n time is Q _{Power-sustain-cha}With total discharge capacity be Q _{Power-sustain-dis}, static one hour, with battery emptying, calculate the electric weight Q that emits with the constant current that is no more than safety current _MidDOD-disThe rate of change of electric weight surpasses 5% after the maintenance operating mode if charge for 100 times; Can cause coulomb efficiency test result to produce a bigger error, be to guarantee precision of test result, control that the rate of change of electric weight is no more than 5% after n maintenance operating mode of charging; Can be through measuring the variable quantity of open-circuit voltage; Realize control according to the variable quantity of open-circuit voltage, be specially before n charging keeps operating mode to begin with after finishing and measure open-circuit voltage respectively, confirm the rate of change of electric weight after n maintenance operating mode of charging according to the variable quantity of open-circuit voltage; Keep like n charging that the rate of change of electric weight surpasses 5% after the operating mode, reduces rate of change that electric weight that n charging keep bleeding off in each operating mode in the operating mode carries out this step electric weight after charging the maintenance operating mode n time again less than 5%;

Step 7: arrive step 6 according to step 3, the enclosed pasture efficiency eta of counting cell in actual usable range, computing formula is:

$\mathrm{\η}=(1-\frac{{\mathrm{\η}}_{\mathrm{MidDOD}}\×Q_{\mathrm{MidDOD}-\mathrm{cha}}-Q_{\mathrm{MidDOD}-\mathrm{dis}}}{Q_{\mathrm{Power}-\mathrm{sustain}-\mathrm{cha}}})\×100\%.$

Embodiment two: the electrokinetic cell to be measured to embodiment one carries out a coulomb efficiency test, and determination step and result are following:

Step 1: select 20 ℃ of temperature in the electrokinetic cell operating temperature range to be measured as temperature measuring enclosed pasture efficient to be measured;

Step 2: battery to be detected is carried out the test of combined power pulse characteristic, with battery emptying electricity to be detected, static one hour; Constant current to be no more than safety current is 10% of an available battery charge with the battery charge electric weight; Carry out the pulse power test then, static one hour is 20% of available battery charge with the constant-current charge that is no more than safety current to electric weight with battery again; Carry out the test of combined power pulse characteristic; So circulation is 90% of an available battery charge up to charge capacity, finishes the test of combined power pulse characteristic.Volt-time curve and current-time curvel in the test of record combined power pulse characteristic, Fig. 2 is this curve.Calculate corresponding charge pulse power ability and discharge pulse power capability and obtain charge pulse power ability and the relation curve of charge capacity and the relation curve of discharge pulse power capability and charge capacity, computing formula is:

Cap _Discharge＝V _Min·(OCV _dis-V _Min)÷R _discharge；

Cap _Regen＝V _Max·(V _Max-OCV _regen)÷R _regen

Wherein: Cap _DischargeBe discharge pulse power capability, Cap _RegenBe charge pulse power ability, V _MinBe the minimum voltage in the discharge pulse process, V _MaxBe the ceiling voltage in the charging pulse process, OCV _DisBe discharge open-circuit voltage, OCV _RegenBe the charging open-circuit voltage, $R_{\mathrm{Disch}\mathrm{Arg}e}=\frac{{\mathrm{\Δ\; V}}_{\mathrm{Disch}\mathrm{Arg}e}}{{\mathrm{\Δ\; I}}_{\mathrm{Disch}\mathrm{Arg}e}}$ Be the discharge internal resistance, $R_{\mathrm{Regen}}=\frac{{\mathrm{\Δ\; V}}_{\mathrm{Regen}}}{{\mathrm{\Δ\; I}}_{\mathrm{Regen}}}$ Be the charging internal resistance.

As shown in Figure 3; The charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and charge capacity is minimum depth of discharge, and the charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and discharge electricity amount is maximum depth of discharge; The minimum depth of discharge of confirming is 40%, and the maximum depth of discharge of confirming is 80%.

Step 3: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived minimum depth of discharge, the electric weight that charges into is Q _MinDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MinDOD-dis, calculate the average enclosed pasture of minimum discharge power efficiency eta according to minimum depth of discharge electric weight that charges into and the electric weight of emitting _MinDOD, computing formula does

${\mathrm{\η}}_{\mathrm{MinDOD}}=\frac{Q_{\mathrm{MinDOD}-\mathrm{dis}}}{Q_{\mathrm{MinDOD}-\mathrm{cha}}}\×100\%;$

Step 4: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived maximum depth of discharge, the electric weight that charges into is Q _MiaxDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight-Q that emits _MaxDOD-dis, the electric weight that charges into and emit according to maximum depth of discharge calculates the average enclosed pasture of maximum discharge power efficiency eta _MidDOD, computing formula is: ${\mathrm{\η}}_{\mathrm{MaxDOD}}=\frac{Q_{\mathrm{MaxDOD}-\mathrm{Dis}}}{Q_{\mathrm{MaxDOD}-\mathrm{Cha}}}\×100\%;$

Step 5: the mean value of the charge capacity of minimum depth of discharge and maximum depth of discharge is middle depth of discharge, depth of discharge enclosed pasture efficient estimated value η in the middle of a minimum discharge power average enclosed pasture efficient of calculating respectively according to step 3 and step 4 and the average enclosed pasture of a maximum discharge power efficiency calculation go out _MidDOD, computing formula does

Step 6: the constant current to be no more than safety current is arrived middle depth of discharge with battery charge, calculates the electric weight Q that charges into _MidDOD-cha, static one hour, bleed off certain electric weight, charge into the electric weight of equivalent again, repeat 100 times with identical operating mode, to do 100 chargings and keep operating mode, the total charge volume that calculates 100 charging maintenance operating modes is Q _{Power-sustain-cha}, total discharge capacity is Q _{Power-sustain-dis}, each charging keeps the powertrace of operating mode as shown in Figure 4, confirms to discharge and recharge power according to the parameter of battery.With 3kW power discharge 30 seconds; Again with 15kW power discharge 3 seconds, then with 3.2kW power charging 55 seconds, at last with 10kW power charging 2 seconds; The volt-time curve of whole process and current-time curvel such as Fig. 5, shown in Figure 6; Static one hour, with battery emptying, calculate the electric weight Q that emits with the constant current that is no more than safety current _MidDOD-dis

Step 7: arrive step 6 according to step 3, the enclosed pasture efficiency eta of counting cell in actual usable range, computing formula is:

$\mathrm{\η}=(1-\frac{{\mathrm{\η}}_{\mathrm{MidDOD}}\×Q_{\mathrm{MidDOD}-\mathrm{cha}}-Q_{\mathrm{MidDOD}-\mathrm{dis}}}{Q_{\mathrm{Power}-\mathrm{sustain}-\mathrm{cha}}})\×100\%.$

Embodiment three:

To the electrokinetic cell to be measured in the embodiment two; Select 30 ℃ of temperature in the electrokinetic cell operating temperature range to be measured as temperature measuring enclosed pasture efficient to be measured in the step 1; N=15 in the step 6, other step and embodiment two identical mensuration enclosed pasture efficient.

Embodiment four:

To the electrokinetic cell to be measured in the embodiment two; Select 40 ℃ of temperature in the electrokinetic cell operating temperature range to be measured as temperature measuring enclosed pasture efficient to be measured in the step 1; N=950 in the step 6, other step and embodiment two identical mensuration enclosed pasture efficient.

Through the mensuration of embodiment two, three, four, the enclosed pasture efficiency value of this electrokinetic cell under 20 ℃, 30 ℃ and 40 ℃ of environment temperatures is shown in table one.

Enclosed pasture efficiency value under 20 ℃, 30 ℃ and 40 ℃ environment temperatures of table one

Claims (6)

1. one kind is used for the enclosed pasture efficiency test method that electrokinetic cell SOC estimates, it is characterized in that this method may further comprise the steps:

Step 1: select the interior temperature of a certain electrokinetic cell operating temperature range to be measured as temperature to be measured, following steps two to step 7 is all carried out under this temperature conditions to be measured;

Step 2: battery to be detected is carried out the test of combined power pulse characteristic; Volt-time curve and current-time curvel in the test of record combined power pulse characteristic; Calculate corresponding charge pulse power ability and discharge pulse power capability and obtain charge pulse power ability and the relation curve of charge capacity and the relation curve of discharge pulse power capability and charge capacity; The charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and charge capacity is minimum depth of discharge, and the charge capacity of the corresponding point of the minimal power values that satisfies the car load power demand on the relation curve of charge pulse power ability and discharge electricity amount is maximum depth of discharge;

Step 3: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived minimum depth of discharge, the electric weight that charges into is Q _MinDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MinDOD-dis, calculate the average enclosed pasture of minimum discharge power efficiency eta according to minimum depth of discharge electric weight that charges into and the electric weight of emitting _MinDOD, computing formula does

${\mathrm{\η}}_{\mathrm{MinDOD}}=\frac{Q_{\mathrm{MinDOD}-\mathrm{dis}}}{Q_{\mathrm{MinDOD}-\mathrm{cha}}}\×100\%;$

Step 4: with battery emptying to be detected, with the constant current that is no more than safety current battery charge is arrived maximum depth of discharge, the electric weight that charges into is Q _MaxDOD-cha, static one hour, then with the constant current that is no more than safety current with battery emptying, calculate the electric weight Q that emits _MaxDOD-dis, the electric weight that charges into and emit according to maximum depth of discharge calculates the average enclosed pasture of maximum discharge power efficiency eta _MidDOD, computing formula is: ${\mathrm{\η}}_{\mathrm{MaxDOD}}=\frac{Q_{\mathrm{MaxDOD}-\mathrm{Dis}}}{Q_{\mathrm{MaxDOD}-\mathrm{Cha}}}\×100\%;$

Step 5: the mean value of the charge capacity of minimum depth of discharge and maximum depth of discharge is middle depth of discharge, depth of discharge enclosed pasture efficient estimated value η in the middle of a minimum discharge power average enclosed pasture efficient of calculating respectively according to step 3 and step 4 and the average enclosed pasture of a maximum discharge power efficiency calculation go out _MidDOD, computing formula does

Step 6: the constant current to be no more than safety current is arrived middle depth of discharge with battery charge, and the electric weight that charges into is Q _MidDOD-cha, static one hour, doing n charging and keeping operating mode, 10＜n＜1000 wherein, total charge volume of calculating the maintenance operating mode of charging for n time is Q _{Power-sustain-cha}With total discharge capacity be Q _{Power-sustain-dis}, static one hour, with battery emptying, calculate the electric weight Q that emits with the constant current that is no more than safety current _MidDOD-disStep 7: arrive step 6 according to step 3, the enclosed pasture efficiency eta of counting cell in actual usable range, computing formula is:

$\mathrm{\η}=(1-\frac{{\mathrm{\η}}_{\mathrm{MidDOD}}\×Q_{\mathrm{MidDOD}-\mathrm{cha}}-Q_{\mathrm{MidDOD}-\mathrm{dis}}}{Q_{\mathrm{Power}-\mathrm{sustain}-\mathrm{cha}}})\×100\%.$

2. the enclosed pasture efficiency test method that is used for electrokinetic cell SOC estimation as claimed in claim 1 is characterized in that temperature to be measured is 20 ℃, 30 ℃ or 40 ℃ in the step 1.

3. the enclosed pasture efficiency test method that is used for electrokinetic cell SOC estimation as claimed in claim 1; It is characterized in that in the step 2 that the test process that battery to be detected is carried out the test of combined power pulse characteristic is: with battery emptying to be detected; Static one hour is the m of available battery charge with the battery charge electric weight with the constant current that is no more than safety current ₁% carries out the pulse power test then, and static one hour is the m of available battery charge with battery to electric weight with the constant-current charge that is no more than safety current again ₂% carries out the test of combined power pulse characteristic, and so circulation is the m of available battery charge up to charge capacity _a%, wherein: m ₁＜m ₂＜m _a, 0＜m ₁＜15,85＜m _a＜100, the test of combined power pulse characteristic is finished in 5＜a＜50.

4. as claimed in claim 1ly be used for the enclosed pasture efficiency test method that electrokinetic cell SOC estimates, it is characterized in that fall into a trap the get it right charge pulse power ability of answering and the computing formula of discharge pulse power capability of step 2 is:

Cap _Discharge＝V _Min·(OCV _dis-V _Min)÷R _discharge

Cap _Regen＝V _Max·(V _Max-OCV _regen)÷R _regen；

Wherein: Cap _DischargeBe discharge pulse power capability, Cap _RegenBe charge pulse power ability, V _MinBe the minimum voltage in the discharge pulse process, V _MaxBe the ceiling voltage in the charging pulse process, OCV _DisBe discharge open-circuit voltage, OCV _RegenBe the charging open-circuit voltage, $R_{\mathrm{Disch}\mathrm{Arg}e}=\frac{{\mathrm{\Δ\; V}}_{\mathrm{Disch}\mathrm{Arg}e}}{{\mathrm{\Δ\; I}}_{\mathrm{Disch}\mathrm{Arg}e}}$ Be the discharge internal resistance, $R_{\mathrm{Regen}}=\frac{{\mathrm{\Δ\; V}}_{\mathrm{Regen}}}{{\mathrm{\Δ\; I}}_{\mathrm{Regen}}}$ Be the charging internal resistance.

5. the enclosed pasture efficiency test method that is used for electrokinetic cell SOC estimation as claimed in claim 1; It is characterized in that the described process of doing n charging maintenance operating mode of step 6 is: bleed off certain electric weight through discharge; Charge into the electric weight of equivalent again; Repeat to be n time with identical operating mode; Before n charging keeps operating mode to begin with after finishing, measure open-circuit voltage respectively; Confirm that according to the variable quantity of open-circuit voltage n charging keeps the rate of change of electric weight after the operating mode, keep like n charging that the rate of change of electric weight surpasses 5% after the operating mode, reduces rate of change that electric weight that n charging keep in the operating mode at every turn bleeding off in the operating mode carries out step 6 electric weight after charging the maintenance operating mode n time again less than 5%.

6. the enclosed pasture efficiency test method that is used for electrokinetic cell SOC estimation as claimed in claim 1 is characterized in that n=100 in the step 6.

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