▎ 摘　　要

NOVELTY - Electrochemical device comprises an electrode assembly, has positive pole piece, an isolation film and a negative pole piece. The isolation film is arranged between positive pole pieces and the negative pole pieces. The positive pole part includes a positive current collector and a positive active material layer arranged on at least one surface current collector. The negative pole member includes a negative current collector, negative active material sheet arranged on one of surface current collectors. The inner side of the end ring of anode current collector facing the winding center is provided with a first empty foil area. A resistance layer is arranged in the first empty-foil area. The cathode of the cathode is provided corresponding to the corresponding cathode pole piece of the collecting tail ring. A heat-shrinkable gummed paper is provided on the corresponding end ring corresponding to a cathode. The area of the heat-thermally adhesive paper accounts for 5-60% of area. USE - Electrochemical device i.e. lithium ion battery, for use in an electronic device e.g. automobile. Can also be used for a portable electric energy storage device. ADVANTAGE - The electrochemical device has good safety performance, so the electronic device provided by the invention has better safety performance. The heat-shrinkable adhesive paper meets the thermal molecular orientation stress release, molecular chain shrinkage, volume does not change area is reduced, the thickness is increased, heat-shrinkable paper shrinkage to reach contact discharge, reduce the charge state of the electrochemical devices, in the range of 85-135 degrees Celsiusto 110-130degrees Celsius, and shrinkage is 10-90% after soaking for 4 hours in the electrolyte at 85-134degrees Celsius in longitudinal and transverse shrinkage. The adhesive force of adhesive paper after soaking is 0.2-0. 01N/mm, and the heat shrinkage at 85degrees Celsiusis 1-2 MPa under the DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for electrochemical device 1) heat-shrinkable gummed paper shrinks in longitudinal direction and transverse direction at 85-135degrees Celsius, and the shrinkage rate is 10-90%, 2) adhesive force of the thermal contraction gummed paper after being soaked in electrolyte at 85degrees Celsius for 4 hours is 0.01-0.2N/mm,3) unilateral maximum glue overflow width of thermal contraction gummed paper after hot pressing for 1h at temperature of 85degrees Celsius and the pressure of 1M-2MPa is less than or equal to 1.5 mm. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the electrochemical device in along its thickness direction. (Drawing includes non-English language text). Electrode assembly (10) Positive pole piece (11) Isolation film (12) Negative pole piece (13) Resistance layer (20) Heat-shrinkable adhesive paper (30) Positive current collector (111) Surface active material layer (112) Negative current collector (131) Surface active material layer (132) Tail ring cathode pole piece (133)