A magnetic pulse welding process for joining a current collector to a terminal pin in the construction of electrochemical cells is described. The magnetic pulse welding process utilizes a pulsed direct current and an electrically conductive coil to generate an electro-magnetic force that causes two work pieces to collide with each other and form a bond therebetween. Preferably, the method is used to bond the terminal pin to the cathode current collector. This method of attachment is suitable for either primary or secondary cells, particularly those powering implantable biomedical devices.

The present invention discloses a method of diffusion bonding of nickel alloy and austenitic stainless steel materials. The method involves: heating a bonding interface of the materials by induction heating at a temperature range in an austenitic temperature region under controlled atmospheric pressure; applying a bonding pressure to maintain contact between materials during a bonding process of materials; cooling the bonded materials through specific time frames to ensure proper chemical interactions and minimize defects, and shielding a bonding environment using a controlled ambient atmosphere to reduce impurities, and prevent oxidation and corrosion. The method further involves forming and shaping subcomponents of stainless steel and nickel alloys.

The present invention discloses a method of diffusion bonding of nickel alloy and austenitic stainless steel materials. The method involves: heating a bonding interface of the materials by induction heating at a temperature range in an austenitic temperature region under controlled atmospheric pressure; applying a bonding pressure to maintain contact between materials during a bonding process of materials; cooling the bonded materials through specific time frames to ensure proper chemical interactions and minimize defects, and shielding a bonding environment using a controlled ambient atmosphere to reduce impurities, and prevent oxidation and corrosion. The method further involves forming and shaping subcomponents of stainless steel and nickel alloys.

A method of joining first and second workpieces that include first and second materials. An intermediate plate located between the first and second workpieces and a heating element is positioned therebetween. The heating element is energized to heat a first heated portion of the first workpiece to a hot working temperature, and to heat the intermediate plate to a first preselected temperature at which the intermediate plate heats a second heated portion of the second workpiece to a second preselected temperature. One or both of the workpieces are subjected to a translocation motion to engage the workpieces, and one or both of the workpieces are subjected to an engagement motion while engaged, to subject the first heated portion to shearing and to adhere the first heated portion to the second heated portion, to bond the first and second workpieces together.

A method of joining first and second workpieces that include first and second materials. An intermediate plate located between the first and second workpieces and a heating element is positioned therebetween. The heating element is energized to heat a first heated portion of the first workpiece to a hot working temperature, and to heat the intermediate plate to a first preselected temperature at which the intermediate plate heats a second heated portion of the second workpiece to a second preselected temperature. One or both of the workpieces are subjected to a translocation motion to engage the workpieces, and one or both of the workpieces are subjected to an engagement motion while engaged, to subject the first heated portion to shearing and to adhere the first heated portion to the second heated portion, to bond the first and second workpieces together.

Disclosed herein is a device for magnetic welding of battery boils comprising a coil holder; where the coil holder comprises one or more electrical coils that are operative to be activated by an electrical current; a foil holding fixture; wherein the foil holding fixture comprises a plurality of arms; wherein each pair of adjacent arms is operative to move towards one another to crimp a plurality of battery foils; and an anvil; wherein the anvil is operative to support a battery tab and the battery foils.

The present invention provides a fixture and method for improving the performance of electromagnetic pulse welding joints. The fixture comprises a base and a pressing block. In the present invention, the pressing block and the base are closely attached to each other through the cooperation of a semi-through groove and a protrusion, and the pressing block is compacted by a pressing plate, so that the semi-through groove is sealed. The semi-through groove may be filled with a specific atmosphere through a suction hole and a gas conveying hole, so that welding may be completed under different atmospheres. By selecting the type of atmosphere, the resistance of a flyer plate and the associated energy loss caused by high-speed movement of the workpieces to be welded can be effectively reduced, so that the welding quality is ensured.

The present invention provides a fixture and method for improving the performance of electromagnetic pulse welding joints. The fixture comprises a base and a pressing block. In the present invention, the pressing block and the base are closely attached to each other through the cooperation of a semi-through groove and a protrusion, and the pressing block is compacted by a pressing plate, so that the semi-through groove is sealed. The semi-through groove may be filled with a specific atmosphere through a suction hole and a gas conveying hole, so that welding may be completed under different atmospheres. By selecting the type of atmosphere, the resistance of a flyer plate and the associated energy loss caused by high-speed movement of the workpieces to be welded can be effectively reduced, so that the welding quality is ensured.