CN102035235A - Device and method for automatically adjusting charging and discharging of battery pack - Google Patents

Abstract

The invention provides a technical scheme of a device and a method for automatically adjusting charging and discharging of a battery pack. In the scheme, the device comprises a plurality of single batteries, a controllable switch array and a configuration processor, wherein the controllable switch array is connected with the single batteries; and the configuration processor controls the switch array, measures the residual power of the single batteries in the battery pack, loads an external load for the battery pack by controlling the switch array, configures the battery pack according to the external load and supplies power to the external load after determining the connection relation of the single batteries. In the scheme, the connection relation of the battery pack can be adjusted in time according to the external load, so that optimal battery configuration is realized and cruise duration of the battery pack is prolonged.

Description

The device and method that automatic regulating cell group discharges and recharges

Technical field:

What the present invention relates to is a kind of battery system, the device and method that especially a kind of automatic regulating cell group discharges and recharges.

Background technology:

Each charging cruising time and useful life are one of most important performance parameters of battery pack system.The system of use multi cell battery group comprises the communication network device of various suitable standby battery groups, electric automobile and hybrid vehicle, regenerative resource memory device, and other all use battery supply sets.Battery energy storage system has crucial effects to the utilization of regenerative resource.In addition, under some crucial task scenes, as emergency relief, law enforcement, fire-fighting and battlefield, the battery life an of the best can be saved more life.In addition, annual all have millions of various chargeable multi cell battery groups owing to the otherness and the unreasonable battery pack that causes of existing system design of battery self go out of use, this has not only caused because of handling the great expense incurred that these batteries produce, and has brought the misgivings of environmental problem simultaneously.Therefore, there are far reaching significance in the cruising time and the life-span of raising battery to socio-economic development.

Summary of the invention:

Purpose of the present invention is exactly at the existing in prior technology deficiency, and provide the technical scheme of the device and method that a kind of automatic regulating cell group discharges and recharges, this scheme can be according to the load of outside, adjust the annexation of battery pack timely, realize optimum cell arrangement, improve the cruising time of battery pack.

This programme is realized by following technical measures: the device that a kind of automatic regulating cell group discharges and recharges, the characteristics of this programme are: comprise a plurality of cells, the controllable switching array that is connected with cell also has a configuration processor with the control switch array.

Configuration processor is measured the dump energy of battery in the battery pack earlier,

Load external loading to battery pack,

Configuration processor is according to external loading setting battery group,

If the electric weight that external loading need or provide satisfies

${\mathrm{RC}}_{\mathrm{scries}}(i_{1,}{i}_{2,}\·\·\·i_{n,}{v}_{1,}{v}_{2,}\·\·\·,v_n)=\underset{j=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{RC}}_j(i_j,v_j^{\′}),---\left(1\right)$

Then with n cell configured in series, in the formula

Be the dump energy of j cell, Be the charging/discharging voltage of each cell, to a cell, if different current i _1jAnd i _2jElectrode voltage v _1jAnd v _2jBe known, so discharging current i when moment t, the charging/discharging voltage of each battery

Can calculate by following formula

$v_j^{\′}=\frac{v_{2j}-v_{1j}}{i_{2j}-i_{1j}}i+v_{2j}---\left(2\right)$

${\mathrm{RC}}_j(i_j,v_j^{\′})=\left\{\frac{1-\exp \left(\frac{r_{\mathrm{nj}}\·I-(v_{\mathrm{ini}}-v_{\mathrm{cutoff}})}{\mathrm{\λ}}\right)}{b_{1j}}\right\}\frac{1}{b_{2j}}-\left\{\frac{1-\exp \left(\frac{r_{\mathrm{nj}}\·I-(v_{\mathrm{ini}}-v_j^{\′})}{\mathrm{\λ}}\right)}{b_{1j}}\right\}\frac{1}{b_{2j}}---\left(3\right)$

Then ${\mathrm{RC}}_{\mathrm{series}}(i_{1,}{i}_{2,}\·\·\·i_{n,}{v}_{1,}{v}_{2,}\·\·\·,v_n)$

$=\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\left\{\frac{1-\exp \left(\frac{r_{\mathrm{nj}}\·I-(v_{\mathrm{ini}}-v_{\mathrm{cutoff}})}{\mathrm{\λ}}\right)}{b_{1j}}\right\}\frac{1}{b_{2j}}-\left\{\frac{1-\exp \left[\frac{r_{\mathrm{nj}}\·I-(v_{\mathrm{ini}}-\frac{v_{2j}-v_{1j}}{i_{2j}-i_{1j}}i-v)}{\mathrm{\λ}}\right]}{b_{1j}}\right\}\frac{1}{b_{2j}}---\left(4\right)$

If the electric weight that external loading need or provide satisfies

${\mathrm{RC}}_{\mathrm{parallel}}(i_{1,}{i}_{2,}...i_{n,}{v}_{1,}{v}_{2,}...,v_n)=\underset{j=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{RC}}_j(i_j,v_j^{\′}),---\left(5\right)$

Then with n cell configured in series, in the formula Be the dump energy of j cell,

Be the charging/discharging voltage of each cell, for a cell, if know different current i _1pAnd i _2p, electrode voltage v _1pAnd v _2p,, and batteries in parallel connection charging/discharging voltage v _Parallel, current i is at the electric current of moment t so

$i=\frac{v_{2p}-i_{1p}}{v_{1p}-v_{2p}}{v}_{\mathrm{parallel}}---\left(6\right)$

In formula (6) substitution formula (2), just can obtain

In the substitution (5) then

${\mathrm{RC}}_{\mathrm{parallel}}(i_{1,}{i}_{2,}...i_{n,}{v}_{1,}{v}_{2,}...,v_n)=$

$\underset{j=1}{\overset{n}{\mathrm{\Σ}}}\left\{\frac{1-\exp \left(\frac{r_{\mathrm{nj}}\·I-(v_{\mathrm{ini}}-v_{\mathrm{cutoff}})}{\mathrm{\λ}}\right)}{b_{1j}}\right\}\frac{1}{b_{2j}}-\left\{\frac{1-\exp \left[\frac{r_{\mathrm{nj}}\·I-(v_{\mathrm{ini}}-\frac{v_{2j}-v_{1j}}{i_{2j}-i_{1j}}*\frac{i_{2p}-i_{1p}}{v_{1p}-v_{2p}}{v}_{\mathrm{parallel}}-v)}{\mathrm{\λ}}\right]}{b_{1j}}\right\}\frac{1}{b_{2j}}---\left(7\right)$

Then with the configuration in parallel of n cell, in the formula It is the dump energy of j battery; If the electric weight that external loading need or provide satisfies

${\mathrm{RC}}_{s,s-p}={\mathrm{RC}}_{s-p}(i_{11},i_{12},...,i_{\mathrm{nm}},v_{11},v_{12},...,v_{\mathrm{nm}})+{\mathrm{RC}}_{\mathrm{series}}(i_1,i_2,...,i_n,v_1,v_2,...,v_n)=$

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{\mathrm{RC}}_{\mathrm{ij}}(i_{\mathrm{ij}},v_{\mathrm{ij}}^{\′})+\underset{k=1}{\overset{p}{\mathrm{\Σ}}}{\mathrm{RC}}_k(i_k,v_k^{\′})=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}m*\mathrm{RC}(\frac{i}{m},v_i)+\underset{k=1}{\overset{p}{\mathrm{\Σ}}}{\mathrm{RC}}_k(i,v_k)---\left(8\right)$

After then m being organized n battery pack parallel connection, again with p battery series connection.In the above-mentioned formula

1.

F is Faraday constant 96485Cmol ^-1R is a gas constant, is 8.3144JK ^-1Mol ^-1N is the electron number that transmits.T is a temperature.

V _IniBe initial voltage, V _CutoffIt is cut-ff voltage.

2.r computing formula be

r(i，T，n _c，T′)＝r ₀(i，T)+r _f(n _c，T′)，

In above-mentioned formula, r ₀(i, T) resistance overpotential and surperficial superpotential effect during battery discharge procedure, and can express by following equation

$r_0(i,T)=a_1\left(T\right)+\frac{a_2\left(T\right)\ln i}{i}+\frac{a_3\left(T\right)}{i},$

Wherein

$a_1\left(T\right)=\frac{A\left(0\right)}{k}\underset{0}{\overset{L}{\∫}}\frac{\mathrm{dx}}{A\left(x\right)}=a_{11}\·\exp \left(\frac{a_{12}}{T}\right)+a_{13}$

A (x) is the cross-section region apart from the x place at the distance negative pole, and L is two distance between electrodes,

$a_2\left(T\right)=\frac{\mathrm{RT}}{F}\left(\frac{1}{{\mathrm{\α}}_a+{\mathrm{\α}}_c}\right)=a_{21}T+a_{22},$

a _aAnd a _cBe respectively the carry-over factor of anode and negative pole,

$a_3\left(T\right)=\frac{\mathrm{RT}}{F}(-\frac{\ln i_{0,a}}{{\mathrm{\&alpha;}}_a}+\frac{{\ln i}_{0,c}}{{\mathrm{\&alpha;}}_c})=a_{31}{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HSA00000389281000011.png"\; state="\{\{state\}\}">T</figure-callout>}}^2+a_{32}T+a_{33},$

i _{0, a}And i _{0, c}Be respectively the exchange current density at anode and negative pole place;

$r_f(n_c,T^{\&prime;})=k\&CenterDot;n_c\&CenterDot;\exp (-\frac{e}{T^{\&prime;}}+\mathrm{\&phi;}),$

n _cBe to discharge and recharge periodicity.T ' is the temperature in previous cycle.K is a constant, e=Ea, and φ=(Ea)/(T ' ref), Ea enlivens energy.

3. the b in the above-mentioned formula can be calculated b by following formula ₁(I, T) and b ₂(I, T) relevant with battery the inside electrolytical change in concentration during discharge process, and can calculate by following equation.

$b_1(i,T)=d_{11}\exp \left(\frac{d_{12}}{T}\right)+d_{13}$

$b_2=(i,T)=\left(\frac{d_{21}}{T+d_{22}}\right)+d_{23}$

Wherein

J=1,2, k=1,2,3 and m (d _Jk) be the coefficient of fixing.

The beneficial effect of this programme can be learnt according to the narration to such scheme, because configuration processor can be adjusted the annexation of battery pack timely in this scheme, make when no matter battery pack is charging or discharge, can both realize optimum configuration, the longest service time that can realize battery pack.This shows that the present invention compared with prior art has outstanding substantive distinguishing features and obvious improvement, the beneficial effect of its enforcement also is conspicuous.

Description of drawings:

Fig. 1 is the structural representation of the specific embodiment of the invention.

Fig. 2 is a setting battery group flow chart of the present invention.

Among the figure, 1 is cell, and 2 is controllable switching array, and 3 is configuration processor.

Embodiment:

For clearly demonstrating the technical characterstic of this programme, below by an embodiment, and in conjunction with its accompanying drawing, the device and method that the automatic regulating cell group of this programme discharges and recharges is set forth.

By accompanying drawing as can be seen, the device of this programme comprises a plurality of cells 1, and the controllable switching array 2 that is connected with cell 1 also has a configuration processor 3 with control switch array 2.

Configuration processor 3 is measured the dump energy of cell 1 in the battery pack earlier, load external loading by control switch array 2 to battery pack then, configuration processor 3 is according to external loading setting battery group, after determining the annexation of cell 1, to the external loading power supply or to a plurality of cells 1 chargings.

The present invention is not limited in above-mentioned embodiment, and the variation that those of ordinary skills make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.

Claims (2)

1. device that automatic regulating cell group discharges and recharges is characterized in that: comprise a plurality of cells, the controllable switching array that is connected with cell also has a configuration processor with the control switch array.

2. method that automatic regulating cell group discharges and recharges is characterized in that:

One group of cell with both positive and negative polarity is provided,

Configuration processor is measured the dump energy of cell,

Load external loading to battery pack,

Configuration processor is according to external loading setting battery group,

If the electric weight that external loading need or provide satisfies

Then with n cell configured in series, in the formula

It is the dump energy of j cell;

If the electric weight that external loading need or provide satisfies

Then with the configuration in parallel of n cell, in the formula It is the dump energy of j battery;

If the electric weight that external loading need or provide satisfies ${\mathrm{RC}}_{s,s-p}={\mathrm{RC}}_{s-p}(i_{11},i_{12},...,i_{\mathrm{nm}},v_{11},v_{12},...,v_{\mathrm{nm}})+{\mathrm{RC}}_{\mathrm{series}}(i_1,i_2,...,i_n,v_1,v_2,...,v_n)=$

After then m being organized the parallel connection of n battery series battery, again with p battery series connection.

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