CN108387848A - A kind of method of the single battery of consistency difference in automatic replacing power battery pack - Google Patents
A kind of method of the single battery of consistency difference in automatic replacing power battery pack Download PDFInfo
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- CN108387848A CN108387848A CN201810239579.5A CN201810239579A CN108387848A CN 108387848 A CN108387848 A CN 108387848A CN 201810239579 A CN201810239579 A CN 201810239579A CN 108387848 A CN108387848 A CN 108387848A
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- battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The method of the single battery of consistency difference, first determines whether and positions the single battery of consistency difference in a kind of automatic replacing power battery pack：(1) each single battery terminal voltage value in battery pack is acquired, the very poor value r of terminal voltage of single battery is calculated, if r >=20% × Vn, then the single battery for starting redundancy battery replacement consistency difference is needed, specifically needs the single battery replaced in (2) positioning battery pack：Antipode difference Rr is calculated, as the Rr of some single battery >=20%, then the single battery is navigated to and needs by redundancy battery replacement；It is then turned off the circuit containing consistency difference single battery, while circuit where redundancy battery being accessed in primary circuit, to complete the process that redundancy battery replaces consistency difference single battery.The battery that the method for the present invention can fast and automatically detect consistency difference is gone forward side by side line replacement, and entire battery pack superperformance is kept, and is reduced maintenance cost and energy loss, is promoted energy transformation ratio and safety.
Description
Technical field
The invention belongs to power battery application fields, and in particular to consistency difference in a kind of automatic replacing power battery pack
The method of single battery.
Background technology
Energy-saving and environment-friendly electric vehicle, which just becomes, solves the problems, such as one of key measure of energy and environment, and power battery is made
For the energy-storage travelling wave tube and power supply of electric vehicle, central role is accounted in electric vehicle.Lithium-ion-power cell is due to following
The remarkable advantages such as the ring service life is high, energy density is big, self-discharge rate is low, are applied widely in electric vehicle field.Due to list
The voltage of block lithium ion battery is relatively low, finite energy, and multiple single battery connection in series-parallel are usually formed battery pack in the application, with
Meet the voltage and power requirement needed for electric vehicle.
Due to technique prepare limitation, even with the single battery that batch is produced, can also exist voltage, capacity,
The otherness of internal resistance and self-discharge rate, i.e. consistency are different.So multiple single battery connection in series-parallel composition battery packs are in the application
" wooden pail effect " problem that will appear, i.e., the worst single battery of performance determines the performance of entire battery pack in battery pack.If
The inconsistent single battery of performance is adjusted or is replaced not in time, be susceptible in use overcharge, cross put, excess temperature etc. it is abnormal
The safety issues such as battery thermal runaway may finally occur in situation.So equalizing circuit module is designed in usual battery pack, electricity
Pond group is in application process adjusted the single battery in battery pack by equalizing circuit in real time, to keep entire battery pack
The consistency of middle single battery.But when the inconsistency of a certain single battery has exceeded threshold application, rely solely on equilibrium
Circuit module can not also be adjusted, so, the excessively poor single battery of consistency must be excluded other than battery module at this time, with
Performance and its safety of entire battery pack are improved, does not there is the list of consistency difference in on-line automatic displacement power battery pack also at present
Body battery and its method of detection.
Invention content
In order to solve the deficiencies in the prior art, the object of the present invention is to provide consistent in a kind of automatic replacing power battery pack
Property difference single battery method, realize battery consistency can quickly detect, single battery displacement control process, to keep entire
Battery pack superperformance reduces maintenance cost and energy loss, promotes energy transformation ratio and safety.
The technical solution adopted by the present invention is that：
The method of the single battery of consistency difference, includes the following steps in a kind of automatic replacing power battery pack：
Step 1：Judge and position the single battery of consistency difference
(1) each single battery terminal voltage value in battery pack is acquired, the very poor value r of terminal voltage of single battery is calculated, if r >=
20% × Vn, then the single battery for starting redundancy battery replacement consistency difference is needed,
R=max (Vx-Vy)
Wherein, VxAnd VyFor two different monomers battery terminal voltage values, VnIt is nominal when dispatching from the factory for single battery in battery pack
Voltage value；
(2) it positions in battery pack and specifically needs the single battery replaced：Antipode difference Rr is calculated, when some single battery
Rr >=20% when, then navigate to the single battery and need by redundancy battery replacement,
Wherein, ViFor certain single battery terminal voltage value,For all single battery end-cell average values；
Step 2：Use the single battery of redundancy battery replacement consistency difference
The circuit containing consistency difference single battery is disconnected, while circuit where redundancy battery being accessed in primary circuit, with
Complete the process that redundancy battery replaces consistency difference single battery.
Further, the gatherer process described in step 1 is：It is acquired simultaneously using LTC6804 battery detections chip multiple
Single battery terminal voltage, microcontroller read the collection result of LTC6804, and result is stored in microcontroller internal storage.
Further, the method for the single battery in step 2 using redundancy battery replacement consistency difference is：Pass through monolithic
Machine controls battery switch control module, disconnects the relay switch of the circuit containing consistency difference single battery, is closed at
The relay switch of circuit containing redundancy battery.
Beneficial effects of the present invention：
The present invention is based on the battery pack topological structures with redundancy single battery, pass through fast automatic detecting to power battery
In group some single battery consistency it is excessively poor and without improve possibility when, using microcontroller control battery switch control mould
Block, disconnect battery pack topological structure in the single battery containing consistency difference circuit relay switch, be closed at containing
The relay switch of the circuit of redundancy battery is replaced in circuit access primary circuit where redundancy battery with completing redundancy battery
Consistency difference single battery, the battery that this method can fast and automatically detect consistency difference are gone forward side by side line replacement, and entire battery is kept
Group superperformance reduces maintenance cost and energy loss, promotes energy transformation ratio and safety.
Description of the drawings
Fig. 1 is single battery terminal voltage detecting circuit structure diagram；
Fig. 2 is switch control module schematic diagram；
Fig. 3 is battery pack topological structure 1；
Fig. 4 is battery pack topological structure 2.
Specific implementation mode
The present invention is described further with reference to specific embodiment.
Embodiment
Step 1：Judge and position the single battery of consistency difference
(1) as shown in figures 1 and 3, E1-E8 single batteries in Fig. 3 are acquired using LTC6804 battery detections chip simultaneously
Terminal voltage value, if the terminal voltage of this 8 single batteries is respectively VE1—VE8, microcontroller reads and stores VE1—VE8.Microcontroller
Pass through voltage pole mathematic interpolation formula r=max (VEx-VEy) calculate very poor value r (wherein, x=1, the 2...8 of each single battery；y
=1,2...8；x≠y)；The nominal voltage V if single battery dispatches from the factoryn=3.7V, can determine that if r >=0.74V in battery pack
The single battery for having consistency very poor needs to replace.
(2) it positions in battery pack and specifically needs the single battery replaced：Pass through calculation formula of averagingMeter
Calculate 8 single battery terminal voltage average valuesPass through antipode mathematic interpolation formulaIt calculates
The antipode difference Rr (wherein, i=1,2...8) of 8 single batteries.If
It then can determine that battery pack E1 batteries are the very poor single battery of consistency, need to replace E1 by redundancy battery, wherein Fig. 3
In E1-E8 be working battery, E9-E12 be 4 redundancy batteries, K1-K6 be relay switch device.K1 when normal work,
K2 is closed, and K3, K4, K5, K6 are disconnected.
When displacement, microcontroller is disconnected by switch control module shown in Fig. 2, control relay K1, K3, K6, relay
K2, K4, K5 are closed, and the battery pack branched battery where such E1 is all isolated, then is replaced by redundancy battery E9-E12.Fig. 2
In photoelectric isolating circuit TLP521 photoelectrical couplers composition can be used, realize driving control of the monolithic machine control signal to relay
System.
Although the very poor battery E1 of consistency successfully can be isolated and be replaced by this method, according to the topology electricity of Fig. 3
Some specific single battery can not be carried out isolation displacement by line structure, and be needed while by E1-E4 all into line replacement, be
Circuit, can be further improved into the structure of Fig. 4, that is, reduce the number of batteries of each working group, relative to Fig. 3, battery by this
2 batteries can be carried out independent displacement by utilization rate higher.Wherein E1-E8 is working battery, and E9-E12 is 4 redundant electrics
Pond.When in E1, E2 single battery one or more occur performance it is seriously inconsistent when, then be closed K1, K2, K5, disconnect K3, K4,
K6-K10, E1, E2 battery are replaced by E9, E10.
Claims (3)
1. a kind of method of the single battery of consistency difference in automatic replacing power battery pack, which is characterized in that including following step
Suddenly：
Step 1：Judge and position the single battery of consistency difference
(1) each single battery terminal voltage value in battery pack is acquired, the very poor value r of terminal voltage of single battery is calculated, if r >=20%
×Vn, then the single battery for starting redundancy battery replacement consistency difference is needed,
R=max (Vx-Vy)
Wherein, VxAnd VyFor two different monomers battery terminal voltage values, VnNominal voltage when dispatching from the factory for single battery in battery pack
Value；
(2) it positions in battery pack and specifically needs the single battery replaced：Antipode difference Rr is calculated, as the Rr of some single battery
When >=20%, then navigates to the single battery and needs by redundancy battery replacement,
Wherein, ViFor certain single battery terminal voltage value,For all single battery end-cell average values；
Step 2：Use the single battery of redundancy battery replacement consistency difference
The circuit containing consistency difference single battery is disconnected, while circuit where redundancy battery being accessed in primary circuit, to complete
Redundancy battery replaces the process of consistency difference single battery.
2. the method for the single battery of consistency difference, special in a kind of automatic replacing power battery pack as described in claim 1
Sign is that the gatherer process described in step 1 is：Multiple single battery ends are acquired using LTC6804 battery detections chip simultaneously
Voltage, microcontroller read the collection result of LTC6804, and result is stored in microcontroller internal storage.
3. the method for the single battery of consistency difference, special in a kind of automatic replacing power battery pack as described in claim 1
Sign is that the method for the single battery in step 2 using redundancy battery replacement consistency difference is：Battery is controlled by microcontroller
Group switch control module, disconnects the relay switch of the circuit containing consistency difference single battery, is closed at containing redundant electric
The relay switch of the circuit in pond.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810239579.5A CN108387848A (en) | 2018-03-22 | 2018-03-22 | A kind of method of the single battery of consistency difference in automatic replacing power battery pack |
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| CN201810239579.5A CN108387848A (en) | 2018-03-22 | 2018-03-22 | A kind of method of the single battery of consistency difference in automatic replacing power battery pack |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112255560A (en) * | 2020-10-19 | 2021-01-22 | 奇瑞商用车（安徽）有限公司 | Battery core health degree prediction method |
| CN112883439A (en) * | 2021-02-07 | 2021-06-01 | 杰华特微电子（杭州）有限公司 | Battery self-checking encryption method, self-checking encryption circuit and battery management circuit |
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Application publication date: 20180810 |
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