Even when he was angry with his children, he never raised his voice.

raised 是动词 raise 的过去式，raise 的意思是"举起、提高"，在这里指"提高音量"。 his 是形容词性物主代词，指代"他的"。 voice 是名词，意思是"声音、嗓音"。 raised his voice 这个短语字面意思是"提高他的声音"，引申为"大声说话、发火"的意思。