CN101692120A - Measuring device and measuring method for measuring maximum available energy of series storage battery pack - Google Patents

Abstract

The invention relates to the field of storage battery measurement, in particular to a measuring method and a measuring device for measuring the maximum available energy of a series storage battery pack. The invention provides the measuring device for measuring the maximum available energy of the series storage battery pack, the measuring device is used for measuring the maximum available energy of a storage battery pack consisting of more than one battery connected in serial, and the measuring main body comprises a capacity measurement module used for measuring the maximum available capacity of the battery pack, a voltage measurement module used for measuring the sum of average open circuit voltages of the battery pack, and an energy measurement module used for measuring the maximum available energy of the battery pack. The invention provides a new method for measuring the maximum available energy of the battery pack, which can more accurately calculate the maximum available energy of the battery pack by measuring the maximum available capacity of the battery pack and the sum of the average open circuit voltages of each single battery in a working charge state interval of the battery. The measuring device and the measuring method provide a basis for more accurately reflecting the service conditions of the batteries.

Description

A kind of measurement mechanism and measuring method thereof of measuring maximum available energy of series storage battery pack

Technical field

The present invention relates to the measuring battery field, particularly relate to a kind of measurement mechanism and measuring method thereof of measuring maximum available energy of series storage battery pack.

Background technology

All the time, the electric weight of battery all adopts capacity as criterion, but in actual use, when adopting the capacity of battery to explain following phenomenon and inconvenient:

(1) after many battery strings of same specification (maximum available and SOC are in full accord) were unified into group, the capacity of electric battery did not increase, but prolonged distance that vehicle can move and service time;

(2) though different battery capacity is the same, the cruising time of battery and external acting there are differences;

(3) same battery, when changing same capacity, the energy that battery discharges there are differences, so the mileage number of operation hours or vehicle operating can not present linear corresponding relation with volume change.

The reason that above problem occurs is: avoided the influence of voltage based on the battery electric quantity describing method of capacity.During actual the use, the major function of battery is energy storage and releases energy, what are directly related for the energy that the continual mileage of vehicle and the cruising time of consumer all discharge with battery, have more realistic meaning so from the angle of energy battery status and dump energy are described.

When many batteries are composed in series electric battery, because the otherness between the battery, therefore the maximum available energy of electric battery is not the maximum available energy sum of each single battery, after the consistance variation of electric battery, the maximum available energy of electric battery descends thereupon, so the maximum available energy of prior art measurements and calculations electric battery is inaccurate.

Summary of the invention

The invention provides a kind of measurement mechanism of measuring maximum available energy of series storage battery pack, measure many inaccurate technical matterss of maximum available energy that battery is composed in series electric battery in the prior art to solve.

Second goal of the invention of the present invention provides the measuring method of above-mentioned measurement mechanism.

In order to realize first goal of the invention of the present invention, adopt following technical scheme:

The invention provides a kind of measurement mechanism of measuring maximum available energy of series storage battery pack, this device is used to measure the maximum available energy by the electric battery that is composed in series more than a battery, and described measurement main body comprises:

Be used to measure the cubic content measurement module of the maximum available of electric battery;

Be used to measure the voltage measurement module of the average open-circuit voltage of electric battery;

Be used to measure the energy measurement module of the maximum available energy of electric battery;

In order to realize second goal of the invention, adopt following technical scheme:

The invention provides a kind of described measuring method of measuring method that is used to measure the accumulator maximum available energy comprises:

(21) measure the maximum available of electric battery by the cubic content measurement module;

(22) measure the open-circuit voltage of electric battery by voltage measurement module;

(23) by energy measurement module counting cell group maximum available energy,

Be formulated as follows:

As preferred version further, the open-circuit voltage of electric battery is the average open-circuit voltage sum of all single batteries in its work state-of-charge interval in the electric battery.The state-of-charge of the work state-of-charge is interval has put each single battery when electric for electric battery state-of-charge each single battery when electric battery is full of electricity.

As a kind of preferred version, the concrete steps of step (21) are as follows:

(41) maximum available and the SOC of measurement single battery;

(42) but calculate the maximum chargeable capacity and the maximum discharge capacity of single battery;

(43) but with the minimum value of the maximum chargeable capacity of single battery and the minimum value addition of maximum discharge capacity, calculate the maximum available of electric battery.

As further preferred version, the concrete steps of step (22) are as follows:

(51) average open-circuit voltage in the work state-of-charge interval of measurement calculating single battery;

(52), obtain the open-circuit voltage of electric battery to the average open-circuit voltage summation of all single batteries of electric battery.

The state-of-charge of the work state-of-charge is interval has put each single battery when electric for electric battery state-of-charge each single battery when electric battery is full of electricity.

The invention provides a kind of new method of measuring the utilisable energy of electric battery,, can calculate the maximum available energy of electric battery more accurately by the maximum available of measurement electric battery and the open-circuit voltage of electric battery.For the operating position of more accurate reflection battery provides foundation.

Description of drawings

Fig. 1 is a process flow diagram of the present invention.

Embodiment

The present invention adopts the maximum available Q of electric battery _Max ^BWith the average open-circuit voltage sum

Product as maximum available energy E _Max ^B, its derivation is as follows:

(SOC of single battery is the residual capacity Q of single battery for State of Charge, definition SOC) according to state-of-charge _RemWith its maximum available Q _MaxRatio, i.e. SOC=Q _Rem/ Q _MaxTherefore:

The maximum discharge capacity Q of single battery _Dch=Q _Rem=Q _Max* SOC

The maximum charge capacity Q of single battery _Ch=Q _Max-Q _Rem=Q _Max* (1-SOC)

The maximum available of supposing n battery is respectively Q _Max[1] ..., Q _Max[n], (State of Charge SOC) is respectively SOC to current state-of-charge ₀[1] ..., SOC ₀[n].Battery strings is unified into group, then the maximum charge capacity Q of this electric battery _{Ch_max} ^BWith discharge capacity Q _{Rem_max} ^BMeasuring method be respectively:

$Q_{\mathrm{rem}\_\max }^B=\min \left\{Q_{\max }\right[1]\×(1-\mathrm{SOC}[1\left]\right),...,Q_{\max }[n]\×(1-\mathrm{SOC}[n\left]\right)\}$

$Q_{\mathrm{rem}\_\max }^B=\min \left\{Q_{\max }\right[1]\×\left(\mathrm{SOC}\right[1\left]\right),...,Q_{\max }[n]\×\left(\mathrm{SOC}\right[n\left]\right)\}$

If electric battery is charged, when then electric battery was full of electricity, the SOC of each battery was respectively:

${\mathrm{SOC}}_0\left[1\right]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[1\right]},...,{\mathrm{SOC}}_0\left[n\right]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[n\right]}$

In this process, the stored energy of any single battery m is in the electric battery:

$E_{\mathrm{ch}}\left[m\right]=Q_{\mathrm{ch}\_\max }^B\×U_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m],\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]},$

U _OCVFor single battery exists

Interval average open-circuit voltage.

Total stored energy E of electric battery _Ch ^BBe the stored energy sum of each single battery, that is:

$E_{\mathrm{ch}}^B=\underset{m=1}{\overset{n}{\mathrm{\Σ}}}{E}_{\mathrm{ch}}\left[m\right]$

${=\underset{m=1}{\overset{n}{\mathrm{\Σ}}}Q}_{\mathrm{ch}\_\max }^B\×U_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m],\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]}$

$=Q_{\mathrm{ch}\_\max }^B\×\underset{m=1}{\overset{n}{\mathrm{\Σ}}}{U}_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m],\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]}$

If this electric battery is discharged, when then discharge finished, the SOC of each battery was respectively:

${\mathrm{SOC}}_0\left[1\right]-\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[1\right]},...,{\mathrm{SOC}}_0\left[n\right]-\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[n\right]}$

In this process, the energy that any single battery m discharges in the electric battery is:

$E_{\mathrm{dch}}\left[m\right]=Q_{\mathrm{rem}}^B\×U_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},\mathrm{SO}{C}_0[m\left]\right]}$

The releasable energy E of electric battery _Dch ^B, i.e. the dump energy E of electric battery _Rem ^B, be the energy sum of each battery release, that is:

$E_{\mathrm{rem}}^B=E_{\mathrm{dch}}^B={\underset{m=1}{\overset{n}{\mathrm{\Σ}}}{E}_{\mathrm{dch}}\left[m\right]=Q}_{\mathrm{rem}}^B\×\underset{m=1}{\overset{n}{\mathrm{\Σ}}}{U}_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},\mathrm{SO}{C}_0[m\left]\right]}$

So in this group between the SOC available area of battery m be arbitrarily:

$\left[{\mathrm{SOC}}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},{\mathrm{SOC}}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]$

Corresponding utilisable energy E[m] be:

$E\left[m\right]=Q_{\max }\left[m\right]\×\left({\mathrm{SOC}}_0\right[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}-{\mathrm{SOC}}_0[m]+\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]})$

$\×U_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]}$

$=(Q_{\mathrm{ch}\_\max }^B+Q_{\mathrm{rem}}^B)\×U_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]}$

$=Q_{\max }^B\×U_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]}$

Q wherein _Max ^BMaximum available for electric battery.

The maximum available energy E of electric battery _Max ^BUtilisable energy sum for each battery promptly has:

$E_{\max }^B==\underset{m=1}{\overset{n}{\mathrm{\Σ}}}E\left[m\right]=Q_{\max }^B\×\underset{m=1}{\overset{n}{\mathrm{\Σ}}}{U}_{\mathrm{OCV}}{|}_{\mathrm{SOC}=\left[\mathrm{SO}{C}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},\mathrm{SO}{C}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}]}$

When being the battery power discharge end, the SOC of each battery;

When being the batteries charging end, the SOC of each battery;

Therefore the work state-of-charge interval of single battery m is

$\left[{\mathrm{SOC}}_0\right[m]-\frac{Q_{\mathrm{rem}}^B}{Q_{\max }\left[m\right]},{\mathrm{SOC}}_0[m]+\frac{Q_{\mathrm{ch}\_\max }^B}{Q_{\max }\left[m\right]}].$

As seen, the maximum available energy of series connection battery pack equals the product of maximum available with the interior average open-circuit voltage sum of all single batteries in its work state-of-charge interval of group of this Battery pack.

The present invention is described in further detail below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, concrete implementation step of the present invention is as follows:

(S01) measure the maximum available Q of each battery _MaxAnd SOC, can adopt existing various metering system;

(S02) but the maximum chargeable capacity of more a plurality of batteries and maximum discharge capacity are determined the maximum available Q of electric battery _Max ^B

(S03) calculate single battery and put electricity condition SOCrem to the average open-circuit voltage U that is full of the electricity condition SOCch from electric battery _OCV

(S04) to the average open-circuit voltage summation of all single batteries of electric battery, obtain the electric battery open-circuit voltage

(S05) calculate maximum available energy

Claims (6)

1. measurement mechanism of measuring maximum available energy of series storage battery pack, described device is used to measure the maximum available energy by the electric battery that is composed in series more than a battery, it is characterized in that, and described measurement main body comprises:

Be used to measure the cubic content measurement module of electric battery maximum available;

Be used to measure the voltage measurement module of the open-circuit voltage sum of electric battery;

Be used to measure the energy measurement module of electric battery maximum available energy.

2. a measuring method that is used for maximum available energy of series storage battery pack adopts the described measurement device of claim 1, it is characterized in that described measuring method comprises:

(21) pass through the maximum available that the max cap. measurement module is measured electric battery;

(22) measure the open-circuit voltage of electric battery by voltage measurement module;

(23) by energy measurement module counting cell group maximum available energy, the open-circuit voltage of the maximum available * electric battery of the maximum available energy=electric battery of electric battery.

3. measuring method according to claim 2 is characterized in that, the open-circuit voltage of described electric battery is the average open-circuit voltage sum of all single batteries in its work state-of-charge interval in the electric battery.

4. measuring method according to claim 2 is characterized in that, the concrete steps of described step (21) are as follows:

(41) maximum available and the SOC of measurement single battery;

(42) but calculate the maximum chargeable capacity and the maximum discharge capacity of single battery;

(43) but with the minimum value of the maximum chargeable capacity of single battery and the minimum value addition of maximum discharge capacity, calculate the maximum available of electric battery.

5. measuring method according to claim 2 is characterized in that, the concrete steps of described step (22) are as follows:

(51) average open-circuit voltage in the work state-of-charge interval of measurement calculating single battery;

(52), obtain the open-circuit voltage of electric battery to the average open-circuit voltage summation of all single batteries of electric battery.

6. the described measuring method of root claim 5 is characterized in that, the interval state-of-charge constant interval that discharges into single battery in the complete charging process for electric battery fully of described work state-of-charge.

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