POLYMER-COATED SEPARATOR HAVING SECONDARY AGGREGATES, MANUFACTURING METHOD THEREFOR, AND BATTERY

The present invention discloses a polymer-coated separator with secondary agglomerates, a preparation method therefor, and a battery. The polymer-coated separator includes: a separator substrate, and a polymer coating applied on a surface of at least one side of the separator substrate, wherein the polymer coating includes a plurality of randomly distributed spray coating points, the spray coating points including a plurality of polymer secondary agglomerates formed by agglomeration of polymer primary particles; any one spray coating point in the polymer coating satisfies the following conditions: 25≤A/B≤40000, and 100