Take the MSE C series battery as the example, has studied the electricconductance in the accumulator cell profession certain concreteapplications, like calculates in the battery through the electricconductance test value the resistance number, whether uses theelectric conductance to reflect the battery capacity, the battery poleplate corrodes the degree, the battery internal return route electricconduction situation, the battery and the connection fitting tightprocedure and so on. And also discussed in the electric conductanceapplication certain aspects limitations.
The key word lead-acid battery electric conductance battery neizubattery capacity battery pole plate corrodes, the battery life, theunusual battery

First, foreword
In recent years, the valve controlled the type seal to exemptthe maintenance lead-acid battery (the VRLA battery) to be more andmore common in the correspondence profession use. Because the VRLAbattery compared the before universal use kai kou shi  the lead-acidbattery to use the more complex gas interior absorption technology andthe seal structure, thus might realize "exempts Uygur", namely did notneed to add water, to make up the acid, also did not need to examinethe specific gravity of electrolyte, but exempted the Uygur batterythe seal structure to give the accumulator cell factory and the useruse attendant judges the accumulator cell the behavior in service tobring the certain difficulty, after for example had accurately tojudge the accumulator cell to use period of time the capacities,generally was, the time which tested through the battery actualelectric discharge carries on is long, needs the special electricdischarge test installation, Also electric discharge period must fullyguarantee needs the battery power supply the equipment in electricdischarge period cannot because of the city electricity power cut butthe power failure. Also like does the accumulator cell after theprocess longer time use, how judge the accumulator cell interior poleplate corrosion situation and infers the battery by this the servicelife? Thus the people hoped can solves this kind of problem throughother simple ways and the method. Recently, some people proposed theelectric conductance may apply in the accumulator cell professionsolves some problems which at present exists, has done the partialresearch work for this author through the experiment, presentlysummarizes as follows, only supplies generally to use the our companyaccumulator cell the user and industry in the colleague refers.

Second, experiment and discussion
First, after the consult material, the electric conductance,namely the resistance reciprocal, its international unit is Siemens(Simens), American unit for Omega -1 (muou).
The battery electric conductance test principle is: Adds on a knownfrequency and the oscillation amplitude alternating voltage signal inthe battery beginnings and ends, surveys and the alternating voltagewith the phase alternating current flow value, its alternating currentcomponent and alternating voltage ratio namely for battery electricconductance. Therefore, through surveys the battery the electricconductance value then approximate calculation battery neizu (batteryneizu namely for electric conductance but actually value).
Accumulator cell many characteristics and battery itself neizu hasclose relationship or can through neizu the change reflects. Below isuses the Wuhan some factory production the electric conductance meter,carries on the findings to the battery performance several aspects:
1st, the electric conductance meter surveys the accumulator cellneizu.
After after will test completely charges leads the way settles 1~2 inthe future MSE-300C battery, its electric conductance valueapproximately about 3.10KS, like neizu but actually the value willcalculate according to the accumulator cell for its electricconductance, approximately for 3.2×10-4 Omega, namely 0.32m Omega.This value and the resistance number (0.30 m Omega about) is quiteclose through in the other mean surveys batteries.
2nd, in accumulator cell sufficient electric discharge processcapacity and electric conductance relations
After passed through the initial charge to pass through 1 hourrate capacity which 4 sufficient electric discharges circulationMSE-300C battery carried on (electric discharge) to test: Dischargingcurrent 165A, about ambient temperature 25 degree Celsius, each 10minutes test a time of battery the electric conductance and thevoltage. In the electric discharge process the electric conductanceand the battery emit the capacity, the voltage and the battery emitsthe capacity the change in value situation to see Figure 1, chart 2
By chart 1 obviously, along with electric discharge processcarrying on, the electric conductance value but gradually reducesalong with the capacity reduction, this shows the voltage with chart 2to be similar along with the battery capacity change curve. This kindof change situation is not difficult to understand that,
Battery the chemical reaction which occurs in the electric dischargeprocess is:
PbO2 + Pb + 2H2SO4 -> 2PbSO4 + 2H2O
It is well known, on positive electrode active material PbO2,cathode active material Pb as well as the H2SO4 electrolyte, all hasthe stronger electric conduction ability, but PbSO4 and the H2Oelectric conduction ability extremely is actually weak, fanyingshi  maysee by above, in the electric discharge process, on electricconduction ability strong positive electrode active material PbO2, incathode active material Pb as well as electrolyte H2SO4 unceasinglyconsumes and transforms as electric conduction ability very weak PbSO4and H2O, thus causes the battery interior electric conduction abilityunceasingly to reduce, battery itself neizu unceasingly increases,namely the electric conductance unceasingly reduces. Thus the batteryelectric conductance may be same with the battery terminal voltage,reflects the battery interior active material under the certaincondition the response consumption situation, namely battery capacitysituation.
3rd, battery internal pole plate corrosion situation to batteryelectric conductance influence
Generally speaking the VRLA battery positive plate corrosionis affects the battery fluctuation charge life the primary factor.Battery positive plate in long time fuchong use process, because thepositive electrode electric potential is higher, the positiveelectrode active material has a stronger oxidability, adds in theelectrolyte the sulfuric acid also to have the strong oxidability,therefore the positive electrode slab lattice which becomes by thelead alloys casting unceasingly is easily corroded, in the slablattice corrosion process, the positive electrode active material andthe slab lattice knot mutual economic assistance organizationgradually changes loosely then falls off, causes the battery electricconduction ability unceasingly to reduce, the battery neizu  graduallyincreases, the electric conductance value reduces, also causes thebattery capacity to reduce. Table 1 was 3 guo  chongdian (after 0.02C (6A)electric current guochongdian 12 months) the after MSE-300C batteryelectric conductance value, may see with the battery electricconductance value which just produced compares, guochongdian the afterbattery electric conductance value already was smaller. This isbecause of after the long time guochongdian, causes the battery poleplate to corrode seriously. Active material and slab lattice unionloose, the battery electric conduction ability drops, thus displaysfor the electric conductance value is smaller. This batterydisintegration investigation, also confirmed this point.
After table 1, guochongdian battery electric conductance situation

The project guochongdian  12 month-long batteries just left theplant the battery
Static electric conductance 2.0291.6512.1503.0253.1812.986
10 rate final voltages 1.8441.8841.8551.8351.8521.846

4th, battery breakdown and electric conductance relation
If accumulator cell because the internal welding (extremelygroup welding, duanzi and jizhu welding) is not good, pours theliquid volume excessively to be many or the too few, the battery itsinternal return route electric conductivity definitely can come underthe influence after the initial charge, its neizu also inevitably canappear exceptionally. If welds is not good or the electrolyticsolution pressure insufficiently can cause the battery nei zu remarkably to increase, the battery electric conductance can obviouslyreduce. Otherwise if time battery interior welding because certainreasons cause to short-circuit or the electrolytic solution pressuresurpass, will be able to cause the battery nei zu  performance for toreduce, the battery electric conductance correspondingly willincrease.