Battery and method of manufacturing the same
A battery in which an electrode tab group is less likely to be damaged is provided. The battery disclosed herein includes an exterior body, a sealing plate, an electrode body, an electrode body holder, a positive electrode terminal, a negative electrode terminal, a positive electrode current collector, and a negative electrode current collector. The electrode body is fixed to the inner wall surface of the electrode body holder.
1 . A battery, comprising:
an exterior body comprising a bottom wall, a pair of first side walls extending from the bottom wall and facing each other, a pair of second side walls extending from the bottom wall and facing each other, and an opening facing the bottom wall;
a sealing plate sealing the opening;
an electrode body housed in the exterior body and comprising a positive electrode, a negative electrode, and a separator separating between the positive electrode and the negative electrode;
an electrode body holder housing the electrode body, made of resin, and housed in the exterior body with the electrode body housed in the electrode body holder;
a positive electrode terminal and a negative electrode terminal which are attached to the sealing plate; and
a positive electrode current collector which electrically connects between the positive electrode and the positive electrode terminal of the electrode body and a negative electrode current collector which electrically connects between the negative electrode and the negative electrode terminal of the electrode body,
wherein
the electrode body comprises a pair of first side surfaces facing the first side walls,
at a first end of the electrode body in a facing orientation of the first side surfaces, a positive electrode tab group including multiple positive electrode tabs protruding from the first end is provided,
at a second end of the electrode body different from the first end in a facing orientation of the first side surfaces, a negative electrode tab group including multiple negative electrode tabs protruding from the second end is provided,
in the positive electrode tab group, tips of the positive electrode tabs constituting the positive electrode tab group are bent so as to be arranged along one of the second side walls, and portions of the positive electrode tabs bent are bonded to the positive electrode current collector,
in the negative electrode tab group, tips of the negative electrode tabs constituting the negative electrode tab group are bent so as to be arranged along the other second side wall, and portions of the negative electrode tabs bent are bonded to the negative electrode current collector,
the electrode body is fixed to an inner wall surface of the electrode body holder,
a first adhesive layer is arranged between at least one of the first side surfaces of the electrode body and the inner wall surface of the electrode body holder,
the electrode body is fixed to the inner wall surface with the first adhesive layer interposed therebetween,
an area of the first adhesive layer is ⅓ or less of an area of the first side surface,
the positive electrode tabs are made of aluminum foils,
the electrode body holder includes a pair of surfaces facing the pair of first side surfaces of the electrode body, and
a region where the first adhesive layer is arranged is located closer to the positive electrode tabs than a center line of the pair of surfaces in a long side direction of the electrode body holder.