A battery cell assembly , comprising: at least two battery cells , wherein the at least two battery cells are stacked, each battery cell comprises an electrode assembly and a battery housing , the electrode assembly is accommodated in the battery housing , and the electrode assembly comprises a first electrode plate , a second electrode plate , and a separator disposed between the first electrode plate and the second electrode plate ; and an insulation film , configured to surround a periphery of the at least two battery cells to wrap the at least two battery cells together; wherein the battery cell further comprises a cover plate , the battery housing has an opening , the battery housing comprises one end face , two first lateral faces , and two second lateral faces , each first lateral face is larger than each second lateral face and larger than the end face in area, two first lateral faces of the two adjacent battery cells face to each other, and the one end face , the two first lateral faces , and the two second lateral faces define a cavity that accommodates the electrode assembly ; and the cover plate covers the opening , the battery cell comprises a first electrode terminal and a second electrode terminal , and the first electrode terminal and the second electrode terminal are disposed on the cover plate ; wherein the insulation film comprises a first adhesive groove , the first adhesive groove faces to the first lateral face , a part of the first lateral face is exposed from the first adhesive groove , and the exposed part of the first lateral face is configured to connect to an adhesive. at least two battery cells , wherein the at least two battery cells are stacked, each battery cell comprises an electrode assembly and a battery housing , the electrode assembly is accommodated in the battery housing , and the electrode assembly comprises a first electrode plate , a second electrode plate , and a separator disposed between the first electrode plate and the second electrode plate ; and an insulation film , configured to surround a periphery of the at least two battery cells to wrap the at least two battery cells together; wherein the battery cell further comprises a cover plate , the battery housing has an opening , the battery housing comprises one end face , two first lateral faces , and two second lateral faces , each first lateral face is larger than each second lateral face and larger than the end face in area, two first lateral faces of the two adjacent battery cells face to each other, and the one end face , the two first lateral faces , and the two second lateral faces define a cavity that accommodates the electrode assembly ; and the cover plate covers the opening , the battery cell comprises a first electrode terminal and a second electrode terminal , and the first electrode terminal and the second electrode terminal are disposed on the cover plate ; wherein the insulation film comprises a first adhesive groove , the first adhesive groove faces to the first lateral face , a part of the first lateral face is exposed from the first adhesive groove , and the exposed part of the first lateral face is configured to connect to an adhesive. <EOS>