ANALYSIS: CMW’S EOL TEST MACHINE CMWTEC has developed a new end-of-line testing machine for leadacid batteries together with newly developed water-cooled modular e-load modules with highly efficient process control software. Michael Wipperfürth, sales manager at CMWTEC discusses the product.
Pushing out the boundaries of end of line testing
After commissioning and running our The graph below is for the first rejected battery #198. This battery has first EOL testing machines for two of continued to supply current until the end of discharge period, even if the voltage our customers, we were able to colwent out of the range after ~ 0.5 seconds. lect a lot of real battery data from the production lines and examine each individual measurement on site. Being able to combine up to five battery profiles in one testing sequence — and the related data acquisition — every single battery can be tested to the level of that achievable in a well equipped laboratory but within a normal production rate. Beside the different profiles of high rate discharges, the machine can deIn opposite to that the second rejected battery #615 delivered a normal current for termine the AC impedance and DC By contrast, the second rejected battery #615 a normaliscurrent for approx. 1,5 seconds and then the voltage drops till 0 delivered volt. This behaviour significantly different from the first rejected Battery These two can be used is for internal resistance of the battery for approximately 1.5 seconds before the#198. voltage drops to batteries zero. This behaviour In opposite to that the rejected battery #615fault delivered a normal current for further examination “e.g.second tear down” to find out each reason. a deeper understanding of the status significantly different from the first rejected battery #198. These two batteries approx. 1,5 seconds and then the voltage drops till 0 volt. This behaviour is significantly of the battery and also a significant can be used for further examination, for example, as a tear down to find out the different from the first rejected Battery #198. These two batteries can be used for indicator about its quality. reasonexamination for each fault. further “e.g. tear down” to find out each fault reason. The combination and evaluation of these measurements all in one system allowed us to successfully detect the most common failure in lead acid batteries right after the formation — more details about that will be published soon. As a simple example, below are the (EOL) End-Of-Line Test Machine By comparing the other test measurement of this battery (ACR, DCR or Delta V) all measurements of the constant curtogether with the voltage drop profile, you obtain much more data to find out the failure rent voltage (CCV, that the voltage After commissioning and isrunning our first EOL machines reason. In this way you can efficiently set and adjust your control limits, where the real comparing the other test measurement of By this battery (ACR, DCR Delta V) all of the under loadweatwere the end comparing the orother test for two battery of our customers, able to By collect acould lot ofbe. failures with the voltage drop profile, you obtain much more data to find out the(ACR, failure of the discharge batterieslinestogether measurements of this battery real battery data test) from of the650 production and examine In this way you can efficiently set andDCR adjustor your control the real each measurement on site. thanksreason. to the feature with individual an acceptance limit of 6.6V. Delta V) limits, with where the voltage failures could be. of As combining 5 test profiles at one test sequence and the test data acquisition, drop profile, you obtain much more you see, up twotoof the batteries are every produced be tested like what can be done in high equipped data to find out the reason for failure. out ofsingle the CCV limit.battery That can is what laboratory within normal production rate. Beside the different profiles of high rate In this way you can efficiently set and conventional HRD machines can do. discharge, the machine can determine the AC impedance and DC internal resistance But with the new EOL, in addition adjust your control limits for where of the battery for deeper understanding the status of the battery and significant to the internal resistance values, you the real failures could be. indicator for the quality. The combination and evaluation of these measurements all in can pick out the discharge curve of ning and running our first EOL machines one system allowed us to successfully detect the most common failure in the lead acid a specificright withformation, a high measafter the ustomers, batteries we werebattery able to collect amore lot details of about that will be published soon. “Being able to combine urement frequency for analysis pura from theAs production linesbelow andareexamine poses. a simple example, the measurements of the constant current voltage up to five test profiles in
ne Test Machine (EOL)
1 measurement thankswith to the feature limit of 6,6 V. ) ofsite. 650 Batteries an acceptance (CCVon p to 5 test profiles at one test sequence and the test data acquisition, duced battery can be tested like what can be done in high equipped n normal production rate. Beside the different profiles of high rate machine can determine the AC impedance and DC internal resistance or deeper understanding the status of the battery and significant quality. The combination and evaluation of these measurements all in wed us to successfully detect the most common failure in the lead acid ter the formation, more details about that will be published soon.
As you see, 2 of the batteries are out of the CCV limit. That is what the conventional
32 HRD • Batteries International • Autumn 2020 the of machines do. But with newthe EOL,constant in addition current to the internal resistance below are the can measurements voltage
ample, values, you can pick out the discharge curve of a specific battery with a high atteries with an acceptance of 6,6 V. measurement frequency limit for analyse purposes. The graph below is for the first rejected
onetest sequence and their corresponding data acquisition lead us to believe that every single battery can be tested to that level, which is only achievable in a well-equipped laboratory, all that within a normal production rate.”
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