Roll core structure and battery

The invention relates to a roll core structure and a battery, the roll core structure is provided with a plurality of tabs, the plurality of tabs with the same polarity are mutually overlapped, the widths of the plurality of tabs are gradually increased, a welding mark is formed at the welding position of the plurality of tabs, the whole welding mark is rectangular, the widths from the first tab to the Nth tab are sequentially reduced to Lmin in an arithmetic progression form, the following calculation formula is satisfied: Lmin is greater than or equal to Q/A * C * Z/W, and A is the overcurrent area of the tab; q is the capacity of the battery; c is the charging rate, W is the width of the welding mark, and Z is a constant. According to the roll core structure, the influence of the battery capacity, the overcurrent area of the tabs, the charging rate and the welding printing area is fully considered, the tab with the minimum width can also ensure the discharging condition under the charging rate of the corre