Battery module end plate, battery module, and preparation method for battery module end plate

A preparation method for a battery module end plate, the preparation method comprising:

• providing a first blank and stamping the first blank to obtain a first plate body;
• providing a molding die and placing the first plate body into the molding die;
• providing a second blank and melting the second blank to obtain a molten material;
• and
• injecting the molten material into the molding die to allow the molten material to be wrapped around the first plate body, and obtaining the battery module end plate through cooling,
• wherein the battery module end plate comprises the first plate body and a second plate body, the second plate body being formed by cooling the molten material and wrapped around the first plate body,
• each of two ends of the first plate body has a connection surface exposed from the second plate body, the first plate body has a locking surface exposed from the second plate body adjacent to the connection surface and configured to be connected to an external component,
• the first plate body has at least one opening, the at least one opening being filled with a part of the molten material during an injection of the molten material into the molding die, the at least one opening comprises a plurality of openings, including some transverse elongated holes, some longitudinal elongated holes, and some circular holes, the longitudinal elongated holes are arranged at intervals in parallel in a transverse direction of the first plate body.