September, 2021


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The Evolution of Battery Testing Continued from previous page


ty in regard to punctures of the battery in normal product use.


Battery Testing There are generally three


parameters to be tested: shorts, opens, and continuity (resistive). In the battery manufacturing process, the main assembly process being tested for is the connection of each cell to its cor- responding positive or negative terminal plate or buss bar. It is critically important to ensure positive and negative cells are not shorted together, and to ensure they are properly con- nected to their corresponding terminal plate. Whatever the mechanical


assembly process used to connect the cells to the terminal plate (ultrasonically welded, soldered,


Page 81


cally designed to address the needs and challenges of today’s battery market. After seeing OEMs and battery manufactur- ers struggle with their own designed test solutions utilizing stepper motors, pistons, and other rudimentary automation devices, Seica designed the first Pilot L4T over 10 years ago. Now, with many years of


experience in this market seg- ment, the new Pilot BT can test battery packs up to 1,050 x 865 mm in size. Being fully automat-


4-wire Kelvin test diagram. Continued on next page


  RPI


Making Ovens Smarter





Pilot BT flying prober for battery testing.


brazed, or other techniques employed), the bonds must be tested electrically, or the battery manufacturer runs several risks: potential field returns, battery efficiency degradation, perform- ance, fire risks, and short prod- uct life span in the field. To measure this important


connection, typically a 4-wire kelvin test is performed. This requires techniques of probing or contacting the battery cell and corresponding terminal/buss bar, and measuring a very low value resistance. This measurement will vary


from one battery manufacturer to another, but is usually in the milliOhm to microOhm (for pris- matic cells) range. These meas- urements are essentially tests to verify the manufacturing pro - cess, rather than the quality or energy composition of the indi- vidual battery itself. Battery impedance measurements (a fourth parameter) can also be performed, which gives a general condition of the batteries. These measurements do not stress the entire battery pack: they test the batteries between the two termi- nal plates and help to detect any weaknesses in the cells.


Flying Probe Testing The Pilot BT is Seica’s next-


generation flying prober specifi-


 Automation Process Control


Process Control Traceability Connectivity


Visit KIC at productronica 2021 and SMTAi in booth 3101


Hall A2 — Stand 316


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