Sealed secondary cell

A sealed secondary cell comprising:

• a battery jar having an opening;
• a plate group having at least one positive plate and at least one negative plate disposed in the battery jar;
• electrolyte impregnated in the plate group;
• a lid jar having a lower side disposed so as to cover the opening of the battery jar, the lid having at least one hole;
• and
• a terminal pole fixed to the lid and disposed through the at least one hole and electrically connected to at least one plate of the plate group, the terminal pole comprising
• i) a flange positioned at the lower side of the lid which has a first upper surface, a second upper surface forming an annular groove in said first upper surface, and a lower surface;
• ii) a pole projecting vertically from the first upper surface of the flange through the hole in the lid;
• and
• iii) a current collector on the lower surface of the flange and connected to the at least one plate;
• an annular pressing spring having an opening with an inner diameter smaller than a maximum outer diameter of the terminal pole;
• wherein the terminal pole has stopping means in at least a part of an outer circumference which engages the opening of the annular pressing spring;
• and
• an annular packing surrounding the terminal pole and disposed within said annular groove and between the second upper surface of the flange and the lower side of the lid, the annular packing being compressed in the vertical direction by an elastic force exerted by the annular pressing spring such that the second upper surface of the flange and the lower side of the lid are sealed by the annular packing.