Abstract: The invention relates to an energy storage module (1) for a vehicle drive system for supplying energy to an electric motor in a vehicle on the one hand or for supplying energy to an aggregate on the other hand, wherein a plurality of individual energy storage cells (2) are combined into a battery (3), wherein at least several of the energy storage cells (2) are electrically conductively connected to a plurality of connection boards (4), wherein the connection boards (4) are prepared for contacting at least one electronics board (5), wherein an electrical connection of an energy storage cell (2) to at least one of the connection boards (4) is implemented via at least one uninsulated conductor element (6) and/or cooling fluid directing means are present which guide fluid used for cooling and heat dissipation in a targeted manner in longitudinal direction of the energy storage cells (2) past the energy storage cells (2), wherein a heat transfer from the energy storage cells (2) to the fluid is however ensured.

Abstract: A piston for an internal combustion engine, having a piston base body, a piston ring element having at least an inner region of a piston crown, and a piston skirt. The piston is provided with pin bosses having pin bores and the ring element has at least an outer region of a piston crown having a circumferential top land and a circumferential ring belt provided with ring grooves. The piston base body and piston ring element are joined together by way of corresponding, conical joining surfaces configured on them.

Abstract: A piston for an internal combustion engine, having a piston base body, a piston ring element having at least an inner region of a piston crown, and a piston skirt. The piston is provided with pin bosses having pin bores and the ring element has at least an outer region of a piston crown having a circumferential top land and a circumferential ring belt provided with ring grooves. The piston base body and piston ring element are joined together by way of corresponding, conical joining surfaces configured on them.

Abstract: An assembled two-part piston, comprising: a piston upper part and a piston lower part, wherein a screw thread connects the piston upper part to the piston lower part.

Abstract: A device for machining and assembling a piston, comprising, a piston upper part; and a piston lower part; an upper work spindle and a lower work spindle, wherein the upper and lower work spindles are arranged coaxially to one another and are at least one of -actuated independently of one another and actuated together, such that one work spindle supports the piston upper part and the other work spindle supports the piston lower part; and a first and second tool carriage, wherein the tool carriages are actuated independently of one another, such that one tool carriage supports a tool for machining the piston upper part and the other tool carriage supports a tool for machining the piston lower part, wherein the device is configured such that both of the piston upper and lower parts are machined independently of one another, aligned with regard to one another, and joined to one another such that the piston parts remain clamped to the tool carriages in the interim.

Abstract: A method for hardening groove walls of the ring groove of a steel piston by a laser beam consists of conducting process gas that contains oxygen onto a groove wall of the steel piston, and putting the steel piston into rotation. The groove wall is irradiated with the laser beam until an oxide layer has formed on the groove wall. Subsequently, the feed of the process gas is turned off, and the groove wall is heated and hardened, in tracks. The degree of heat conductivity of the groove wall is improved by the oxide layer on the groove wall, thereby bringing about faster heating and hardening of the groove wall. The reflectivity of the groove wall is also reduced in this way, so that only little light is reflected by the groove wall onto other regions of the groove, so that these regions are not unintentionally heated and hardened.