CN105098923A - Battery pack charging method capable of achieving battery equalization - Google Patents
Battery pack charging method capable of achieving battery equalization Download PDFInfo
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- CN105098923A CN105098923A CN201510542877.8A CN201510542877A CN105098923A CN 105098923 A CN105098923 A CN 105098923A CN 201510542877 A CN201510542877 A CN 201510542877A CN 105098923 A CN105098923 A CN 105098923A
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- battery
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- duty ratio
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery pack charging method capable of achieving battery equalization. The battery pack charging method comprises the following steps of 1, building a unit battery model; 2, building a single-battery model in which different unit batteries are connected in parallel; 3, testing a change relation of the internal resistance and the capacity of the unit battery with circulation numbers; 4, studying the repeatedly-executed step 2 of the single battery in different circulation numbers; 5, determining optimal charging current cycle period; 6, setting a charging frequency matrix and a duty cycle matrix; 7, respectively charging the battery by using different frequencies at different duty cycles; 8, acquiring the average charging current under the charging frequency, and calculating optimal charging current frequency under the duty cycle; 9, recording optimal frequency and corresponding current; and 10, readjusting the duty cycle for recording the optimal frequency again. According to the battery pack charging method capable of achieving battery equalization, provided by the invention, the difference between the single batteries can be reduced, meanwhile, the optimal charging frequency is considered, and the battery is rapidly charged.
Description
Technical field
The invention belongs to electric vehicle engineering field, be specifically related to electric automobile power battery group charging control model.
Background technology
For ensureing that cell safety reliably works, power battery pack is generally all equipped with battery management system.Battery management system function mainly comprises: running parameter monitoring, state parameter estimation, battery balanced control, heat management etc.Accurate estimating battery group state parameter can ensure the safety in utilization of battery pack, but can not reduce or eliminate the difference between each single battery, and for this reason, forefathers propose active equilibrium and the passive type equalization methods of battery pack.Passive equilibrium discharges by the energy crossing limit is changed into heat energy, keeps the balance of each single battery energy, and the circuit of this kind of mode is relative with control method simple, but there is the problem of energy dissipation and heat management aspect in battery balanced process.Active equalization is by designing specific energy converter, redistributing energy, and conventional method has Buck-Boost method, degree of flying capacitance method, transformer method etc. based on inductance.Existing equalization methods is all realized by external Equilibrium device, and structure is very complicated.
Summary of the invention
For the problems referred to above, the present invention proposes the method for charging battery pack based on cell self-balancing effect in parallel and the acceptable charging current curve of battery, the method for charging battery pack that the present invention proposes can reduce the difference between single battery, consider the optimum charge frequency of battery simultaneously, realize the quick charge of battery.The concrete technical scheme adopted is:
Realize a battery balanced method for charging battery pack, comprising: determine best charging current cycle period, determine charging current optimal frequency and pulse duty factor;
Describedly determine that the process of best charging current cycle period is:
Step 1, based on single order RC equivalent-circuit model, sets up cell model, and utilizes test data to verify cell model;
Step 2, sets up the single battery model of different monomers cell parallel, and under the different cell number in parallel of simulation study, single battery is in the self regulation time between each cell in inside under different SOC;
Step 3, experimental test internal resistance of single cell and capacity are with the variation relation of cycle-index;
Step 4, research single battery is positioned at repeated execution of steps 2 under different cycle-index;
Step 5, carries out normal distribution statistical analysis to many group self regulation times, and then determines best charging current cycle period;
Describedly determine that the process of charging current optimal frequency and pulse duty factor is:
Step 6, setting charge frequency matrix f=(f
1, f
2..., f
n), duty ratio matrix d=(d
1, d
2..., d
m), using frequency adjustment as inner ring, duty ratio adjustment is as outer shroud;
Step 7, respectively at different duty ratio d
junder, with different frequency f in matrix f
ibattery is charged;
Step 8, gathers this charge frequency f
imean charging current I in the lower a certain set time
avgi (), calculates at duty ratio d
jthe optimal charge power frequency of lower correspondence;
Step 9, record duty ratio d
junder optimal frequency f
set(k) and now corresponding electric current I
set(k);
Step 10, according to duty ratio matrix d=(d
1, d
2..., d
m), readjust duty ratio d
jcarry out the record again of optimal frequency.
As preferably, the cell number described in described step 2 is 8.
Further, the calculation expression of the optimal charge power frequency described in described step 8 is:
F
op(j)={ f
i| max (I
avg(i)), i=1,2 ..., n}; And need I be met
op(j) < I
c_max;
Wherein f
opj () is duty ratio d
jthe optimal charge power frequency of lower correspondence, I
opj () is duty ratio d
jtime optimal charge power frequency f
opj charging current that () is corresponding, I
c_maxfor battery charging acceptable charging current.
Further, optimal frequency f described in described step 9
set(k)=f
op(j), the electric current I of described correspondence
set(k)=I
op(j).
Compared to the prior art, beneficial effect of the present invention:
The present invention, by the control to ferric phosphate lithium cell charge mode, reduces the difference of each single battery state parameter in battery pack, solves the existing circuit structure challenge utilizing external Equilibrium device to cause while realizing quick charge.
Accompanying drawing explanation
Fig. 1 is single order RC equivalent-circuit model schematic diagram;
Fig. 2 single battery topology diagram;
Fig. 3 is that 8 joint cell parallel connections form each monomer battery voltage curve chart when single battery charges;
Fig. 4 is the battery balanced flow chart that the present invention proposes based on charging modes;
Fig. 5 is battery acceptable current for charge curve chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
What the present invention proposed a kind ofly realizes battery balanced method for charging battery pack and comprises: determine best charging current cycle period, determine charging current optimal frequency and pulse duty factor.
The process that the charging current cycle period of above-mentioned the best is determined:
1) based on single order RC equivalent-circuit model, as shown in Figure 1, set up cell model, and utilize test data to verify cell model;
2) the single battery model of different monomers cell parallel is set up, as shown in Figure 2, under the different cell number in parallel of simulation study, single battery is in the self regulation time between each cell in inside under different SOC, as shown in Figure 3, when 8 joint cells are in parallel, due to the existence of brace, cause charging voltage difference between each cell to expand further, therefore be necessary in charging process, at regular intervals cell is left standstill, realize self-balancing between cell;
3) experimental test internal resistance of single cell and capacity are with the variation relation of cycle-index;
4) study single battery and be arranged in step 2 under different cycle-index) research contents;
5) normal distribution statistical analysis is carried out to many group self regulation times, and then determine best charging current cycle period.
The deterministic process of above-mentioned charging current optimal frequency and pulse duty factor:
1) charge frequency matrix f=(f as shown in Figure 4, is set
1, f
2..., f
n), duty ratio matrix d=(d
1, d
2..., d
m), using frequency adjustment as inner ring, duty ratio adjustment is as outer shroud;
2) respectively at different duty ratio d
junder, with different frequency f in matrix f
ibattery is charged;
3) the mean charging current I under gathering this charge frequency in a certain set time
avg(i),
Then f
op(j)={ f
i| max (I
avg(i)), i=1,2 ..., n}, wherein f
opj () is duty ratio d
jthe optimal charge power frequency of lower correspondence, now also needs to meet I
op(j) < I
c_max, wherein I
opj () is duty ratio d
jtime charging current corresponding to optimal charge power frequency, I
c_maxfor battery charging acceptable charging current, see accompanying drawing 5;
4) duty ratio d is recorded
junder optimal frequency and now corresponding electric current f
set(k)=f
op(j), I
set(k)=I
op(j);
5) according to duty ratio matrix d=(d
1, d
2..., d
m), readjust duty ratio d
jcarry out the record again of optimal frequency.
The above is only for describing technical scheme of the present invention; the protection range be not intended to limit the present invention; should be understood that under the prerequisite without prejudice to flesh and blood of the present invention and spirit, institute changes or equivalent to replace etc. all will fall within the scope of protection of the present invention.
Claims (3)
1. can realize a battery balanced method for charging battery pack, it is characterized in that, comprise: determine best charging current cycle period, determine charging current optimal frequency and pulse duty factor;
Describedly determine that the process of best charging current cycle period is:
Step 1, based on single order RC equivalent-circuit model, sets up cell model, and utilizes test data to verify cell model;
Step 2, sets up the single battery model of different monomers cell parallel, and under the different cell number in parallel of simulation study, single battery is in the self regulation time between each cell in inside under different SOC;
Step 3, experimental test internal resistance of single cell and capacity are with the variation relation of cycle-index;
Step 4, research single battery is positioned at repeated execution of steps 2 under different cycle-index;
Step 5, carries out normal distribution statistical analysis to many group self regulation times, and then determines best charging current cycle period;
Describedly determine that the process of charging current optimal frequency and pulse duty factor is:
Step 6, setting charge frequency matrix f=(f
1, f
2..., f
n), duty ratio matrix d=(d
1, d
2..., d
m), using frequency adjustment as inner ring, duty ratio adjustment is as outer shroud;
Step 7, respectively at different duty ratio d
junder, with different frequency f in matrix f
ibattery is charged;
Step 8, gathers this charge frequency f
imean charging current I in the lower a certain set time
avgi (), calculates at duty ratio d
jthe optimal charge power frequency of lower correspondence;
Step 9, record duty ratio d
junder optimal frequency f
set(k) and now corresponding electric current I
set(k);
Step 10, according to duty ratio matrix d=(d
1, d
2..., d
m), readjust duty ratio d
jcarry out the record again of optimal frequency.
2. according to claim 1ly a kind ofly realize battery balanced method for charging battery pack, it is characterized in that, the calculation expression of the optimal charge power frequency described in described step 8 is:
F
op(j)={ f
i| max (I
avg(i)), i=1,2 ..., n}; And need I be met
op(j) < I
c_max;
Wherein f
opj () is duty ratio d
jthe optimal charge power frequency of lower correspondence, I
opj () is duty ratio d
jtime optimal charge power frequency f
opj charging current that () is corresponding, I
c_maxfor battery charging acceptable charging current.
3. according to claim 1 and 2ly a kind ofly realize battery balanced method for charging battery pack, it is characterized in that, optimal frequency f described in described step 9
set(k)=f
op(j), the electric current I of described correspondence
set(k)=I
op(j).
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| CN201510542877.8A CN105098923B (en) | 2015-08-28 | 2015-08-28 | It is a kind of that battery balanced method for charging battery pack can be achieved |
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| CN201510542877.8A CN105098923B (en) | 2015-08-28 | 2015-08-28 | It is a kind of that battery balanced method for charging battery pack can be achieved |
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| CN105098923B CN105098923B (en) | 2017-12-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759212A (en) * | 2016-01-27 | 2016-07-13 | 惠州市蓝微新源技术有限公司 | Battery pack fault simulation method and fault detection method |
| CN106887877A (en) * | 2015-12-16 | 2017-06-23 | 中国科学技术大学 | A kind of battery pack active equalization control system estimated based on battery power status |
| CN107240729A (en) * | 2017-05-10 | 2017-10-10 | 上海蔚来汽车有限公司 | Method for charging batteries |
| CN109494421A (en) * | 2018-12-21 | 2019-03-19 | 常州普莱德新能源电池科技有限公司 | A kind of equalization methods of lithium ion battery, device and storage medium |
| CN112234661A (en) * | 2020-04-30 | 2021-01-15 | 蜂巢能源科技有限公司 | Method for determining optimal charging parameter of battery, charging management method and system |
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| CN103682499A (en) * | 2013-12-23 | 2014-03-26 | 湖北工业大学 | Variable-frequency pulse charging method for lithium ion batteries of hybrid cars |
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| CN103682499A (en) * | 2013-12-23 | 2014-03-26 | 湖北工业大学 | Variable-frequency pulse charging method for lithium ion batteries of hybrid cars |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106887877A (en) * | 2015-12-16 | 2017-06-23 | 中国科学技术大学 | A kind of battery pack active equalization control system estimated based on battery power status |
| CN106887877B (en) * | 2015-12-16 | 2023-06-16 | 中国科学技术大学 | Battery pack active equalization control system based on battery energy state estimation |
| CN105759212A (en) * | 2016-01-27 | 2016-07-13 | 惠州市蓝微新源技术有限公司 | Battery pack fault simulation method and fault detection method |
| CN105759212B (en) * | 2016-01-27 | 2019-08-30 | 惠州市蓝微新源技术有限公司 | Battery pack failure simulation method and fault detection method |
| CN107240729A (en) * | 2017-05-10 | 2017-10-10 | 上海蔚来汽车有限公司 | Method for charging batteries |
| CN107240729B (en) * | 2017-05-10 | 2019-10-22 | 上海蔚来汽车有限公司 | Method for charging batteries |
| CN109494421A (en) * | 2018-12-21 | 2019-03-19 | 常州普莱德新能源电池科技有限公司 | A kind of equalization methods of lithium ion battery, device and storage medium |
| CN112234661A (en) * | 2020-04-30 | 2021-01-15 | 蜂巢能源科技有限公司 | Method for determining optimal charging parameter of battery, charging management method and system |
| CN112234661B (en) * | 2020-04-30 | 2022-03-29 | 蜂巢能源科技有限公司 | Method for determining optimal charging parameter of battery, charging management method and system |
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|---|---|
| CN105098923B (en) | 2017-12-05 |
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