Battery Maintenance Technologies

8/7/2019 Battery Maintenance Technologies

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Outlines

Type of batteries- Chng loi accu1

How to judges the condition of batteries Lm th no chn on tnh trng accu

2

Two ways to test batteries condition Hai cch kim tra tnh trng accu

3

Operations - Hot ng4


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Diagram

Lead-Acid

Battery

Two common types LA batteryHai loi accu ph bin

Flooded VRLA

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Battery Cell

Type of battery cell Loi bn cc ca accu

Voltage: 2V 4V 6V 8V 10V 12V 14V 16V

Capacity- Dung lng: 50AH to 3000AH or more

Applications: Motive Power, Auto Motive

Stationary/Backup Powerng c in, t ng lcVn phng phm / Sao lu in


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Battery Cell

Type of battery cell

Single Cell

Battery Unit: JAR / Monoblock


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Battery String

Type of battery String

Telecommunication: 48V

UPS system: 110V 220V 380V 600V

Forklift: 24

V/48

V


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Hot Tip How to know the condition of batteries?

To compare current capacity to the nominal orinitial capacity- so snh dung lng hin ti vidung lng danh nh .

It should be noted that if capacity has fallen to 80%, the one-year replacement period mightnot ensure that the battery can fulfill its duty cycle. In this instance, the battery should bereplaced at the earliest opportunity -Cn lu rng nu nng lc gim n 80%, thigian thay th mt nm c th khng m bo rng pin c th hon thnh nhim v chu kca n. Trong trng hp ny, pin s c thay th ti cc c hi sm nht .

A capacity of 80% shows that the battery rate of deterioration is increasing even if there isample capacity to meet the load requirements.

Page 15, Section 8 Battery replacement criteriaIEEE Standard 450-2002

Mt cng sut 80% cho thy t l pin ca suy thoi ang gia tng, ngay c nu c nng lc dido p ng nhu cu ph ti. "

15 Page, Mc 8 "Pin tiu chun thay th"Tiu chun IEEE 450-2002


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Test Methods

DischargeTest Kim

tra x

BatteryTest

InternalResistance

orConductanceTest kim tra Ni tr

hoc dn

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Discharge Test

Benefits u im

The only way to exactly know the condition of

battery cell by Ah (ampere-hour) result Cch duy nht bit chnh xc tnh trng ca pin bng Ah (ampe-gi) kt qu

Extend lifecycle of battery cell M rng vng i ca t bo pin

To test whole battery string in same time kim tra ton b pin chui thi


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Discharge Test

Disadvantage

Long test period10 hours discharging time plus 4 to 10 hours charging time

Long giai on th nghim

10 gi thi gian x cng 4 n 10 gi thi gian sc pin

High extra cost

Electricity fee and employee salaryThm chi ph cao

in ph v lng nhn vin

No record and analyzing function for oldmodels

Khng c chc nng ghi li v phn tch cho cc m hnh c


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Discharge Test

Aitelongs SAT-AL intelligent Load Bank

Monitoring Function

to monitoring whole battery string voltage, each battery cell voltage, whole batterystring current, discharged capacity

Full Automatic Operation

Four terminated conditions: time,

capacity, string volt, cell volt

Data record and powerful PC analyzing function

Chc nng gim st theo di ton b chui in p pin, mi pin in p, ton b chui pin hin ti, cngsut thi

Ton t ng hot ngBn chm dt iu kin: thi gian,nng lc, dy volt, t bo volt

Bn ghi d liu v my tnh mnh m phn tch chc nng


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Ohmic Test

Ohmic and Discharge Test- Ohmic v th nghim phng

e.g. A bottle has 500 ml of water how do you know if the bottle has less than 400 ml of water80%

a) by cup measureb) by weight

c) by water level

Ohmic measurement is like weight or water level measurement to monitor the loss ofwater and calculate the remaining volume of water (capacity).

v d: Mt chai 500 ml c nc lm th no bn bit nu chai c t hn 400 ml nc 80%a) bng bin php lyb) tnh theo trng lng

c) theo cp nc

Ohmic o c nh o mc trng lng hoc nc theo di s mt nc vtnh ton khi lng cn li ca nc (cng sut).


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Ohmic Test

It is a measure of the plate surface whichdetermines how much chemical reaction or powerthe battery can generate.

The battery state of health can be diagnosed bythe change of the plate surface.


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Ohmic Test

Conductance

Internal resistance/ impedance

SOHSOHStateState--ofof--healthhealth

Conductance

Internal resistance/ impedance


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Ohmic Test

Internal Ohmic Measurements

Impedance measurements can be performed by passing acurrent of known frequency and amplitude through thebattery and measuring the resultant ac voltage dropacross each cell/unit.

Impedance and resistance are inversely related toconductance.

Conductance = 1 / Impedance


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Ohmic Test


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Ohmic Test

Reference Value

Reference Value / Threshold Value is a sample orstandard which tester get from when battery is initialinstalled or from manufactory recommended.

Use latest test value compare to the reference value

to get rate which can refer to batterys SOH.


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Ohmic Test

British Telecom Paper at Intelec 1998

eImpedance/Conductance Measurements as an Aid toDetermining Replacement Strategy

Conclusions:This paper has shown that two particular parameters,

namely conductance/impedance monitoring andtemperature/time/life factors can be effective inforecasting battery replacement timescales.


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Ohmic Test


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Ohmic Test

France Telecom Paper at Intelec 2001

eMeasurement of Impedance and Conductance: Myth and RealityTested in the Field

Analysis and ConclusionIn a power system architecture serving telecommunications equipment,

batteries are used in an emergency through lack of normalelectrical supply, generally the mains. It is therefore absolutely

impossible to disconnect them to test their residual capacity bymeasurement of conductance or impedance. These must becarried out online. Consequently, as soon as a battery is made upof more than one string, it is necessary to take into account thecorrection factor.

(p. 419, Analysis and Conclusion)


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Ohmic Test

France Telecom Paper at Intelec 2001

Regarding the conductance measured with apparatus A, the fault

thresholds determined from measurements on more than 1200Monoblock (AGM 12 V 75 Ah) are as follows:

Loss of conductance less than 30%= loss of capacity less than 20%

Loss of conductance more than 40%= loss of capacity more than 20%

(p. 420, Measurement Results)


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Ohmic Test

Guidelines on Measurement

a) - The battery tested should be under stable conditions (Not

in the process of charging and discharging)

b) - The battery should be tested under the same condition.(We compare apple with apple, not apple with orange);

c) - The test probes or clamp should be placed as close aspossible to the battery posters (to avoid the impact fromother metal accessories)

d) - The test can identify good or bad cells


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Battery Maintenance Technologies

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