Electrochemical element for a battery and corresponding battery

An electrochemical cell for a battery, comprising

• a first electrode of a first polarity,
• a first terminal of the first polarity,
• a second electrode of a second polarity,
• a second terminal of the second polarity,
• a casing comprising:
• a first wall and a second wall, wherein the first wall and the second wall each comprise a base body made of metal and an electrically insulating layer comprising a plastic coating or a layer resulting from surface treatment, each of the base bodies comprises a base body edge, the edges of the base bodies connected by a weld bead to form the casing, and at the location of the weld bead, the base bodies are free of the electrically insulating layer;
• at least one opening for a passage of the first or second terminal, the first or second terminal extending through the opening;
• and
• an electrical insulation electrically insulating the first or second terminal from the casing, the electrical insulation comprising:
• a plastic electrical insulation element extending between the first or second terminal and the casing, the plastic electrical insulation made of plastic material, and
• electrically insulating spacer elements separating the first or second terminal from the casing when the plastic electrical insulation element is in a liquid state, wherein the spacer elements comprise microballs of a material having a melting temperature above the melting temperature of the plastic material and the microballs having a diameter between 100 μm and 200 μm, wherein the microballs are embedded in the plastic electrical insulation element made of solidified molten plastic material,
• wherein the first or second terminal is a tab and the opening of the casing is formed by two edges of the first and second walls of the casing spaced apart from each other.