Temperature control plate for connection with a battery housing, battery housing for a motor vehicle, and method for manufacturing a battery housing

A temperature control plate for connection with a battery housing of a motor vehicle, the temperature control plate comprising:

• a temperature control duct structure with a temperature control duct profile,
• wherein the temperature control plate is comprised of a manganese-boron steel sheet and is hot-formed,
• the temperature control plate has an aluminum alloy layer on an outside thereof, and
• the temperature control plate has a tensile strength Rm>1,000 MPa and a martensitic structure of at least 50 vol. % martensite.

A battery housing for a motor vehicle, the battery housing comprising:

• a bottom and at least four side walls connected to the bottom to form an interior space configured to receive a battery;
• and
• a temperature control plate comprising a temperature control duct structure with a temperature control duct profile,
• wherein the temperature control plate is comprised of a manganese-boron steel sheet and is hot-formed, the temperature control plate has an aluminum alloy layer on an outside thereof, and the temperature control plate has a tensile strength Rm>1,000 MPa and a martensitic structure of at least 50 vol. % martensite, and
• wherein the temperature control plate is fluid-tightly connected, by laser welding or gluing, to
• a) the bottom in such a way that a temperature control duct is formed between the temperature control duct profile of the temperature control duct structure and the bottom, or
• b) a lid of the battery housing in such a way that a temperature control duct is formed between the temperature control duct profile of the temperature control duct structure and the lid, wherein the lid is arranged opposite the bottom and closes off the interior space.

A method for manufacturing a battery housing for a motor vehicle, the method comprising:

• applying a precoating to at least one side of an MnB steel sheet, wherein the precoating has the following composition in addition to aluminum and unavoidable impurities:
• 5.9 to 12.9 wt. % Si,
• 0.5 to 4.0 wt. % Fe,
• hot forming the MnB steel sheet into a temperature control plate with a temperature control duct structure that has at least one temperature control duct profile;
• forming a battery tray having an interior space configured to receive a battery, by
• forming a second steel sheet into the battery tray with a bottom and at least four side walls, or
• cutting the second steel sheet into a bottom and at least four side walls and subsequent joining to form the battery tray;
• and
• fluid-tightly connecting the temperature control plate to the battery tray, by
• welding or gluing the temperature control plate to the bottom of the battery tray to obtain the battery housing in which a temperature control duct is formed between the temperature control duct profile of the temperature control duct structure and the bottom, or
• welding the temperature control plate to a lid, and arranging the lid on the battery tray to obtain the battery housing in which a temperature control duct is formed between the temperature control duct profile of the temperature control duct structure and the lid, and the lid is arranged opposite the bottom and closes off the interior space,
• wherein the temperature control plate has an aluminum alloy layer on an outside thereof, the aluminum alloy layer is formed from the precoating by the hot forming, and the temperature control plate has a tensile strength Rm>1,000 MPa and a martensitic structure of at least 50 vol. % martensite.