Battery module and method for manufacturing same

Abstract

In a battery module in which battery cells are inserted and adhered to battery retention sections each having a hole and formed on a holder, an objective is to provide a technology for sufficiently filling the gap between the battery retention section of the holder and the battery cell with an adhesive. A deformable porous layer 40 is formed on an outer circumferential surface 11 of each battery cell 1 , and an adhesion layer 4 is formed by impregnating the porous layer 40 with an adhesive. Alternatively, the deformable porous layer 40 is formed on the outer circumferential surface 11 of each of the battery cells 1 , and an adhesive layer 46 including an adhesive is formed on the back side in an insertion direction with respect to the porous layer 40.

1 . A method for manufacturing a battery module, the method comprising:
 preparing a battery cell and a holder having a battery retention section with a hole;   forming an adhesion layer on an outer circumferential surface of the battery cell; and   inserting the battery cell in the battery retention section of the holder, wherein,   at the forming of the adhesion layer, a deformable porous layer is formed on the outer circumferential surface of the battery cell and the porous layer is impregnated with an adhesive to form an adhesion layer including the porous layer and the adhesive.   
     
     
         2 . A method for manufacturing a battery module, the method comprising:
 preparing a battery cell and a holder having a battery retention section with a hole;   forming an adhesion layer on an outer circumferential surface of the battery cell; and   inserting the battery cell in the battery retention section of the holder, wherein   at the forming of the adhesion layer,   a deformable porous layer is formed in a first area which is a part of the outer circumferential surface of the battery cell, and   an adhesive layer including an adhesive is formed on a second area located adjacent to the first area and on a back side thereof in an insertion direction for the battery cell to form an adhesion layer including the porous layer and the adhesive.   
     
     
         3 . The method for manufacturing the battery module according to  claim 1 , wherein
 at the forming of the adhesion layer,   at least at one part of an area of the outer circumferential surface of the battery cell in an axial direction, the adhesion layer is formed on a whole circumference of the outer circumferential surface of the battery cell.   
     
     
         4 . The method for manufacturing the battery module according to  claim 1 , wherein the porous layer is elastically deformable. 
     
     
         5 . The method for manufacturing the battery module according to  claim 2 , wherein
 at the forming of the adhesion layer,   at least at one part of an area of the outer circumferential surface of the battery cell in an axial direction, the adhesion layer is formed on a whole circumference of the outer circumferential surface of the battery cell.   
     
     
         6 . The method for manufacturing the battery module according to  claim 2 , wherein the porous layer is elastically deformable. 
     
     
         7 . The method for manufacturing the battery module according to  claim 2 , wherein at the forming of the adhesion layer, the porous layer and the adhesive layer are brought in contact with each other. 
     
     
         8 . The method for manufacturing the battery module according to  claim 2 , wherein at the forming of the adhesion layer, the porous layer is impregnated with a low viscosity adhesive having a lower viscosity than that of the adhesive included in the adhesive layer. 
     
     
         9 . A battery module comprising:
 a holder having a battery retention section with a hole;   a battery cell inserted in the battery retention section of the holder; and   an adhesion part interposed between the holder and the battery cell, wherein   the adhesion part includes a porous layer, and an adhesive impregnating at least one part of the porous layer.