CN109193828A - A kind of method of each single string battery core voltage difference in fast uniform electrokinetic cell system - Google Patents
A kind of method of each single string battery core voltage difference in fast uniform electrokinetic cell system Download PDFInfo
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- CN109193828A CN109193828A CN201810992549.1A CN201810992549A CN109193828A CN 109193828 A CN109193828 A CN 109193828A CN 201810992549 A CN201810992549 A CN 201810992549A CN 109193828 A CN109193828 A CN 109193828A
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- battery core
- voltage
- voltage difference
- abnormal
- cell system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
Abstract
The method of each single string battery core voltage difference in a kind of fast uniform electrokinetic cell system provided by the invention, including step 1, measure normal battery core voltage U1, abnormal battery core voltage U2；Step 2, the voltage difference of the abnormal battery core and the normal battery core, as virtual voltage difference U are calculated；Step 3: calculating the capacity difference C of abnormal battery core Yu normal battery core, step 4, calculating is filled or discharge current I；Step 5, it calculates and fills or discharge time T；Step 6, power supply or load are connected to the both ends of abnormal battery core, the setting time is T, and unlatching is filled or discharged, and power supply or load are disconnected after time T, is completed balanced.Method provided by the invention, it is easy to operate, easily controllable, pressure difference is again inconsistent after solving the problems, such as constant-current constant-voltage charging time length, standing in the prior art or recycling needs to finely tune, it greatly improves work efficiency, and restored electrokinetic cell system because monomer capacity difference caused by continual mileage decline, avoid because pressure difference it is inconsistent caused by life time decay.
Description
Technical field
The present invention relates to single string battery cores each in battery balanced method more particularly to a kind of fast uniform electrokinetic cell system
The method of voltage difference.
Background technique
Power battery monomer otherness caused by the manufacturing and use process, causes the different of power battery monomer
Cause property.Inconsistency is mainly manifested in monomer capacity, internal resistance, self-discharge rate, efficiency for charge-discharge etc..Monomer it is inconsistent,
The loss that necessarily will cause electrokinetic cell system capacity in turn results in the decline in service life.Some researches show that single battery core 20%
Capacity volume variance can bring the capacitance loss of battery pack 40%.Battery cell it is inconsistent, can over time, temperature with
And further deteriorate under the influence of the enchancement factors such as vibration condition.There are mainly two types of methods at present to solve the inconsistent of voltage
Property, first, the manufacturing process of single battery is improved, uses matched with a batch of battery as far as possible in process of production
Group, but this method is not absolutely effectively, over time, the problem of consistency, still will appear.Second, pass through battery
Management system implements constantly equilibrium to battery core, and balanced to be divided into active equalization and passive equilibrium again, so-called active equalization is i.e. with storage
Energy device etc., is transferred to the less battery core of energy up for the battery core portion of energy of the more energy of load, is the transfer of energy；It is main
Dynamic equilibrium needs to configure related circuit and energy storage device, and volume is big, at high cost, reliability is low, these conditions limit actively
Weighing apparatus application and popularization.And passive equilibrium is to fall the energy consumption of high voltage or highly charged amount battery core, with resistor to reach
It is that a kind of deflection type of energy is balanced to the purpose for reducing gap between different battery cores；It is passive balanced again because power consumption is high, low efficiency
In actual production process not with application.Based on both the above balanced way advantage and disadvantage, cannot achieve in production process or after sale
Battery core of quickly breaking off relations in the process voltage difference problem, and this method efficiently, can be solved accurately in battery modules or system respectively just
The problem of single string voltage inconsistency.
Summary of the invention
For the above-mentioned prior art, the technical problem to be solved in the present invention is to provide a kind of fast uniform electrokinetic cell systems
The method of interior each single string battery core voltage difference.
In order to solve the above technical problems, the present invention provides single string battery core electricity each in a kind of fast uniform electrokinetic cell system
Inconsistent method, including step 1 are pressed, normal battery core voltage U1, the voltage U2 of abnormal battery core are measured, step 2, is calculated described
The voltage difference of abnormal battery core and the normal battery core, as virtual voltage are poor,
Step 3, the capacity difference of abnormal battery core Yu normal battery core, as capacity C are calculated
Step 4, it calculates and fills or discharge current I；
Step 5, it calculates and fills or discharge time T, fill or discharge
Step 6, power supply or load connect to the both ends of abnormal battery core, the setting time is T, unlatching power supply or load, filled or
It discharges, power supply or the automatic disconnection of load, complete the equilibrium of battery core voltage difference after time T.
Step 3, calculating process are as follows:
A. referring to " SOC&OCV mapping table ", the section SOC where determining the abnormal battery core calculates every 1%SOC voltage difference
U1%soc,
B. it calculates
c.
d.
Beneficial effects of the present invention
The method of each single string battery core voltage difference, is filled by calculating in a kind of fast uniform electrokinetic cell system provided by the invention
It is electricity or discharge time, easy to operate, be easy to control in power supply or load upper setting time and can be completed the equilibrium of battery core monomer
System, pressure difference is again inconsistent after solving the problems, such as constant-current constant-voltage charging time length, standing in the prior art or recycling needs to finely tune,
It greatly improves work efficiency, and has restored electrokinetic cell system because continual mileage caused by monomer capacity difference declines, keep away
Exempt from because pressure difference it is inconsistent caused by life time decay.
Detailed description of the invention:
Fig. 1 is singly to go here and there the inconsistent structural schematic diagram of battery core voltage in electrokinetic cell system
Fig. 2 is " SOC&OVC " mapping table
1 --- normal battery core, 2 --- abnormal battery core, 3 --- load.
Specific embodiment
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, below in conjunction with
The present invention is described in further detail for attached drawing and a specific embodiment of the invention.It should be appreciated that tool described herein
Body embodiment is only used to explain the present invention, is not intended to limit the present invention.
As Fig. 1 provides a kind of method of each single string battery core voltage difference in fast uniform electrokinetic cell system, including it is normal
Battery core (1), abnormal battery core (2), load (3), the rated capacity of battery core are 30Ah,
Step 1, measuring normal battery core voltage U1 is 3.785V, and abnormal battery core voltage U2 is 3.815V,
Step 2, the voltage difference for calculating abnormal monomer and normal monomer, show that virtual voltage is poorU2-U1=0.03V,
Step 3, the capacity difference of abnormal battery core Yu normal battery core, as capacity C are calculated
A, it referring to " SOC&OCV mapping table ", determines that the section SOC where the abnormal battery core (2) is 65% ~ 60%, calculates every
1%SOC voltage differenceU
B. it calculates
c.
d.
Step 4, discharge current I is calculated,
Preferably, with the electric discharge of 10C discharge-rate
Step 5, discharge time T is calculated,
Step 5, the both ends that load (3) are connected to abnormal battery core (2), it is 6min that the time is arranged on load (3), opens load
(3), it is filled or is discharged, 6min back loading (3) disconnects automatically, and it is balanced to complete battery core voltage difference.
Preferably, voltage is measured with voltage meter in step 1；
Further, it when the voltage U2 of abnormal battery core (2) is lower than the voltage U1 of normal battery core (1), needs to abnormal battery core (2)
It charges, the mode for calculating the charging time is consistent with the calculation method of discharge time, and the main distinction is to abnormal battery core (2)
The equipment to charge is power supply.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
The equivalent structure or equivalent flow shift that description of the invention and accompanying drawing content are done is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (4)
1. the present invention provides a kind of method of single string battery core voltage difference each in fast uniform electrokinetic cell system, feature exists
In this approach includes the following steps
Step 1: measuring the voltage of normal battery core and the voltage of abnormal battery core；
Step 2: calculating the voltage difference of abnormal battery core Yu normal battery core, as virtual voltage difference U；
Step 3, the capacity difference of abnormal battery core Yu normal battery core, as capacity C are calculated
Step 4, it calculates and fills or discharge current I；
Step 5, it calculates and fills or discharge time T, fill or discharge
Step 6: power supply or load connect to the both ends of abnormal battery core, the setting time is T, unlatching power supply or load, filled or
It discharges, power supply or the automatic disconnection of load, complete the equilibrium of battery core voltage difference after time T.
2. the method for each single string battery core voltage difference in a kind of fast uniform electrokinetic cell system according to claim 1,
It is characterized in that, the calculation method of step 3 are as follows:
According to " SOC&OCV mapping table ", the section SOC where determining the abnormal battery core calculates every 1%SOC voltage difference U 1%
Soc, i.e.,
Further, it calculates
Further,
Further,。
3. the method for each single string battery core voltage difference in a kind of fast uniform electrokinetic cell system according to claim 1,
It is characterized in that, when the voltage of abnormal battery core is higher than the voltage of normal battery core, is discharged with power supply abnormal battery core.
4. the method for each single string battery core voltage difference in a kind of fast uniform electrokinetic cell system according to claim 1,
It is characterized in that, when the voltage of abnormal battery core is lower than the voltage of normal battery core, is charged with load to abnormal battery core.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810992549.1A CN109193828A (en) | 2018-08-29 | 2018-08-29 | A kind of method of each single string battery core voltage difference in fast uniform electrokinetic cell system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810992549.1A CN109193828A (en) | 2018-08-29 | 2018-08-29 | A kind of method of each single string battery core voltage difference in fast uniform electrokinetic cell system |
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| CN109193828A true CN109193828A (en) | 2019-01-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111092470A (en) * | 2019-12-25 | 2020-05-01 | 欣旺达电动汽车电池有限公司 | Method and device for acquiring capacity difference of batteries in battery pack and storage medium |
| CN113517743A (en) * | 2021-08-05 | 2021-10-19 | 济南腾铭信息科技有限公司 | Battery cell balanced recovery method in battery system |
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| CN111092470A (en) * | 2019-12-25 | 2020-05-01 | 欣旺达电动汽车电池有限公司 | Method and device for acquiring capacity difference of batteries in battery pack and storage medium |
| CN113517743A (en) * | 2021-08-05 | 2021-10-19 | 济南腾铭信息科技有限公司 | Battery cell balanced recovery method in battery system |
| CN113517743B (en) * | 2021-08-05 | 2023-05-12 | 山东浪潮科学研究院有限公司 | Battery cell balance recovery method in battery system |
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