Battery

A battery, comprising:

• a housing, wherein the housing has a cavity;
• a battery cell, wherein the battery cell is arranged in the cavity, the battery cell comprises a positive electrode plate, a negative electrode plate, and a separator arranged between the positive electrode plate and the negative electrode plate, and the positive electrode plate, the negative electrode plate, and the separator are wound to form the battery cell;
• wherein in a winding axis direction of the battery cell, a width of the separator is greater than a width of the positive electrode plate and a width of the negative electrode plate, and a height of the cavity is greater than or equal to the width of the separator;
• and
• an electrolyte solution, wherein the electrolyte solution is filled in the battery cell, and the electrolyte solution comprises fluoroethylene carbonate, wherein the cavity, the separator, and the electrolyte solution satisfy following relationship:
• C
• ≥
• B
• /
• 20
• ⁢
• A
• +
• 1
• ,
• wherein a content of fluoroethylene carbonate in the electrolyte solution is C %, and a value of C is less than or equal to 20 and greater than or equal to 2.25;
• A represents a distance between an edge of the separator and an edge of a positive electrode plate that are on a same side in the winding axis direction of the battery cell, and
• B represents a height of the cavity in the winding axis direction of the battery cell, and B ranges from 50 mm to 400 mm;
• a ratio of the height B of the cavity in the winding axis direction of the battery cell to the distance A between the edge of the separator and the edge of the positive electrode plate that are on the same side in the winding axis direction of the battery cell ranges from 25 to 200,
• wherein the electrolyte solution comprises a second additive, wherein the second additive comprises 1,3-propane sultone and 1,3,6-hexanetricarbonitrile,
• a content of the second additive accounts for 0.5 wt % to 15 wt % of the mass of the electrolyte solution,
• wherein an upper edge of the separator abuts against an upper inner side wall of the cavity, and a lower edge of the separator abuts against a lower inner side wall of the cavity.