An electrochemical energy storage device, comprising: a cell composed of a positive electrode plate, a negative electrode plate and a separator positioned between the positive electrode plate and the negative electrode plate; an electrolyte immersing the cell; and a package accommodating the cell and the electrolyte; characterized in that: the electrochemical energy storage device further comprises: a binding material positioned between the cell and the package, and comprising: a first adhesive layer directly adhered on an outer surface of the cell; and a second functional layer positioned on a side of the first adhesive layer opposite to a surface of the first adhesive layer directly adhered on the cell, the second functional layer being selected from a pressure sensitive adhesive or a composite material composited by the pressure sensitive adhesive and a temperature sensitive adhesive, the second functional layer being not directly adhered to the package before a pressure is applied on the electrochemical energy storage device, and the second functional layer being directly adhered to the package after the pressure is applied on the electrochemical energy storage device. a cell composed of a positive electrode plate, a negative electrode plate and a separator positioned between the positive electrode plate and the negative electrode plate; an electrolyte immersing the cell; and a package accommodating the cell and the electrolyte; characterized in that: the electrochemical energy storage device further comprises: a binding material positioned between the cell and the package, and comprising: a first adhesive layer directly adhered on an outer surface of the cell; and a second functional layer positioned on a side of the first adhesive layer opposite to a surface of the first adhesive layer directly adhered on the cell, the second functional layer being selected from a pressure sensitive adhesive or a composite material composited by the pressure sensitive adhesive and a temperature sensitive adhesive, the second functional layer being not directly adhered to the package before a pressure is applied on the electrochemical energy storage device, and the second functional layer being directly adhered to the package after the pressure is applied on the electrochemical energy storage device. the electrochemical energy storage device further comprises: a binding material positioned between the cell and the package, and comprising: a first adhesive layer directly adhered on an outer surface of the cell; and a second functional layer positioned on a side of the first adhesive layer opposite to a surface of the first adhesive layer directly adhered on the cell, the second functional layer being selected from a pressure sensitive adhesive or a composite material composited by the pressure sensitive adhesive and a temperature sensitive adhesive, the second functional layer being not directly adhered to the package before a pressure is applied on the electrochemical energy storage device, and the second functional layer being directly adhered to the package after the pressure is applied on the electrochemical energy storage device. a binding material positioned between the cell and the package, and comprising: a first adhesive layer directly adhered on an outer surface of the cell; and a second functional layer positioned on a side of the first adhesive layer opposite to a surface of the first adhesive layer directly adhered on the cell, the second functional layer being selected from a pressure sensitive adhesive or a composite material composited by the pressure sensitive adhesive and a temperature sensitive adhesive, the second functional layer being not directly adhered to the package before a pressure is applied on the electrochemical energy storage device, and the second functional layer being directly adhered to the package after the pressure is applied on the electrochemical energy storage device. a first adhesive layer directly adhered on an outer surface of the cell; and a second functional layer positioned on a side of the first adhesive layer opposite to a surface of the first adhesive layer directly adhered on the cell, the second functional layer being selected from a pressure sensitive adhesive or a composite material composited by the pressure sensitive adhesive and a temperature sensitive adhesive, the second functional layer being not directly adhered to the package before a pressure is applied on the electrochemical energy storage device, and the second functional layer being directly adhered to the package after the pressure is applied on the electrochemical energy storage device.