Patent ID: 9368978
Filing Date: 2016-06-14
CPC Classification: H02J

Claim Text:
1. A method of manufacturing a battery module having a plurality of battery cells, the plurality of battery cell including at least one group of battery cells to be connected in parallel, comprising: a) before the battery cells are permanently interconnected, making temporary contact with terminals of the battery cells; b) during the temporary contact, measuring quiescent voltages, capacitances and internal resistances of the battery cells; c) during the temporary contact, determining a required duration for the charge balancing based on the measured quiescent voltages, capacitances, and internal resistances; d) during the temporary contact, implementing a charge balancing by short-circuiting the battery cells of each of the at least one groups of battery cells to be connected in parallel; e) ending the temporary contact and the short-circuiting after the charge balancing has been implemented for the required duration; and f) after the charge balancing, producing a permanent parallel interconnection of each of the at least one group of battery cells to be connected in parallel by fastening connecting lugs on respective terminals of the battery cells.