| CPC H01M 10/045 (2013.01) [H01M 4/78 (2013.01); H01M 50/466 (2021.01); H01M 50/512 (2021.01); H01M 50/533 (2021.01); H01M 50/538 (2021.01); H01M 2004/025 (2013.01); H01M 50/531 (2021.01)] | 5 Claims |
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1. A battery module with a plurality of electrodes connected in parallel with each other, the battery module comprising:
a positive electrode member having a positive electrode current collector, a first positive electrode active material layer provided on the positive electrode current collector, and a second positive electrode active material layer provided on the positive electrode current collector, wherein the positive electrode current collector has a first main surface and a second main surface, the first positive electrode active material layer is provided on the first main surface of the positive electrode current collector, and the second positive electrode active material layer is provided on a portion of the second main surface of the positive electrode current collector which does not overlap with the first positive electrode active material layer in a thickness direction of the positive electrode current collector in a state where the positive electrode current collector is not folded, wherein the first main surface of the positive electrode current collector has a first exposed portion formed in an area overlapping with the second positive electrode active material layer in the thickness direction of the positive electrode current collector and exposing the positive electrode current collector, and, wherein the second main surface of the positive electrode current collector has a second exposed portion formed in an area overlapping with the first positive electrode active material layer in the thickness direction of the positive electrode current collector and exposing the positive electrode current collector;
a negative electrode member having a negative electrode current collector, a first negative electrode active material layer provided on the negative electrode current collector, and a second negative electrode active material layer provided on the negative electrode current collector, wherein the negative electrode current collector has a first main surface and a second main surface, the first negative electrode active material layer is provided on the first main surface of the negative electrode current collector, and the second negative electrode active material layer is provided on a portion of the second main surface of the negative electrode current collector which does not overlap with the first negative electrode active material layer in a thickness direction of the negative electrode current collector in a state where the negative electrode current collector is not folded, wherein the first main surface of the negative electrode current collector has a first exposed portion formed in an area overlapping with the second negative electrode active material layer in the thickness direction of the negative electrode current collector and exposing the negative electrode current collector, and wherein the second main surface of the negative electrode current collector has a second exposed portion formed in an area overlapping with the first negative electrode active material layer in the thickness direction of the negative electrode current collector and exposing the negative electrode current collector; and
a separator arranged between the positive electrode member and the negative electrode member,
the positive electrode current collector having a positive electrode folded-back portion in which the positive electrode current collector is folded back so that the first positive electrode active material layer and the second positive electrode active material layer are aligned in a thickness direction of the first positive electrode active material layer,
the negative electrode current collector having a negative electrode folded-back portion in which the negative electrode current collector is folded back so that the first negative electrode active material layer and the second negative electrode active material layer are aligned in a thickness direction of the first negative electrode active material layer,
the first negative electrode active material layer being arranged so as to face the first positive electrode active material layer, thereby constituting a first electrode together with the first positive electrode active material layer,
the second negative electrode active material layer being arranged so as to face the second positive electrode active material layer, thereby constituting a second electrode connected in parallel with the first electrode together with the second positive electrode active material layer,
the separator having:
a first interposed portion interposed between the first positive electrode active material layer and the first negative electrode active material layer, and
a second interposed portion interposed between the second positive electrode active material layer and the second negative electrode active material layer,
wherein the negative electrode folded-back portion is arranged on a side opposite to the positive electrode folded-back portion with respect to the first and second electrodes, and
wherein the separator has a coupling portion which passes between the first electrode and the second electrode and couples the first interposed portion and the second interposed portion,
the coupling portion having:
a passing element which passes between the first electrode and the second electrode,
a first fold-back element which is folded between the first negative electrode active material layer and the positive electrode folded-back portion and connects the passing element and the first interposed portion, and
a second fold-back element which is folded between the second positive electrode active material layer and the negative electrode folded-back portion and connects the passing element and the second interposed portion,
wherein the passing element passes between the first exposed portion of the positive electrode current collector and the first exposed portion of the negative electrode current collector.
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