Battery Case Reinforcing Part Enveloped Casting

The patent applies composite materials by combining the housing material (e.g., aluminum alloy) with a reinforcing part made of a different material having higher rigidity (e.g., steel or iron alloy). This composite structure allows the abutting wall to achieve the required strength and rigidity to bear the battery stack load while maintaining a thinner wall thickness, thereby reducing the overall size of the battery pack in the stacking direction without compromising structural integrity.

The patent applies local quality by providing a reinforcing part only in the specific region where it is most needed - the abutting wall portion that bears the load from the battery stack. The reinforcing part is selectively positioned to enhance local rigidity and load-bearing capacity, while other portions of the housing can maintain thinner walls to reduce overall size. This localized reinforcement allows the abutting wall to be made thinner without compromising the rigidity where it is critically needed.

The patent applies merging by integrating the reinforcing part with the housing through enveloped casting, creating a unified composite structure. The reinforcing part is embedded within the housing material during the casting process, forming an integrated component rather than separate parts that would require additional assembly steps. This merging approach reduces device complexity by eliminating the need for separate installation processes while still providing the enhanced load-bearing capacity of the high-rigidity reinforcing material.