The invention relates to a method for connecting electrochemical devices, and relates to the field of 
electrochemistry, aiming at smartly solving the problems that a plurality of electrochemical devices connected in groups are inconsistent in reactions, serious in liquid deficiency, great in maintenance amount and great in production operation amount. Each electrochemical device internally comprises electrodes, electrolytic substances and a shell, wherein the electrolytic substances comprise 
electrolyte and generated gas. Each electrochemical device is characterized in that a connecting channel for communicating of the electrolytic substances is further arranged among the electrochemical devices so that the interface, density, ingredients, 
temperature and pressure are consistent; outlets in the two sides of the channel are formed in the electrodes for 
electrical connection among the electrochemical devices so as to prevent 
short circuit. The method is used for batteries, or 
electrolysis, 
electroplating, 
electroforming and 
electrophoresis devices, and in particularly suitable for vehicle batteries frequently bumped, so that the service life, reaction consistency and safety of the electrochemical devices, particularly an 
electric vehicle liquor-rich lead-acid 
battery pack, are greatly prolonged or improved, while the rate of water loss, maintenance work load, process change and cost are reduced; the method is simple and practical, and the performance is obviously excellent.