Aluminum electric wire crimping terminal, crimping device and crimping method

1. An aluminum electric wire crimping terminal comprising:

an aluminum electric wire extending in a forward direction; and

a crimping terminal that is connected with the aluminum electric wire, wherein

the aluminum electric wire includes a plurality of core wires, and a sheath that covers the plurality of core wires,

the crimping terminal includes a contact portion and a crimping portion of a cylindrical shape,

the crimping portion includes an insertion hole, and

in a state where the plurality of core wires is inserted in the insertion hole, the crimping portion is compressed and the plurality of core wires and the crimping portion directly contact each other and are directly electrically connected to each other,

a low compression concave portion that has a concave shape recessed on the side of the plurality of a core wires from the crimping portion and that compresses and electrically contacts the plurality of core wires and a high compression concave portion that has a concave shape recessed on the side of the plurality of core wires from the crimping portion and that compresses and electrically contacts the plurality of core wires are molded in the crimping portion and offset from each other in the forward direction, and

the high compression concave portion further protrudes in a lower direction more than a distal end surface of the low compression concave portion, and compresses the plurality of core wires with a stronger compression force than a compression force of the low compression concave portion.

2. The aluminum electric wire crimping terminal according to claim 1 , wherein

the high compression concave portion is located and molded on a side in the forward direction of the low compression concave portion.