Electrochromic device

An electrochromic device, comprising a first additional layer, a first base layer, an electrochromic layer, a second base layer, and a second additional layer that are stacked, wherein:

• two ends of the electrochromic layer are flush with two ends of the first base layer, two ends of the second base layer and two ends of the second additional layer are disposed beyond the two ends of the electrochromic layer, and a first sealing element is disposed around the electrochromic layer and on the second base layer;
• the electrochromic device further comprises a second sealing element embedded in the second base layer, wherein one end of the second sealing element abuts on the first sealing element, or one end of the second sealing element is embedded in the first sealing element;
• the second sealing element is an adhesive that is an insulator, a water-oxygen barrier and comprises any one of a pressure-sensitive adhesive, a hot melt adhesive, a UV light-curing adhesive, a heat-curing adhesive, and a UV thermal dual-curing adhesive;
• and
• the second base layer is provided with a sealing groove extending in a peripheral direction of the second base layer and arranged to surround the electrochromic layer, the sealing groove is discontinuous on only one side of the second base layer in the peripheral direction to define two spaced ends, and the sealing groove is filled with the second sealing element along the sealing groove from one of the two spaced ends to the other of the two spaced ends.