US 12,412,899 B2
Electrochemical accumulator with bipolar architecture including a specific structure
Djamel Mourzagh, Grenoble (FR); Julio Abusleme, Saronno (IT); Gaëlle Besnard, Grenoble (FR); Marc-David Braida, Bry sur Marne (FR); Elise Gutel, Grenoble (FR); Hélène Rouault, Grenoble (FR); and Daniel Tomasi, Grenoble (FR)
Assigned to COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, Paris (FR); and SOLVAY FRANCE, Aubervilliers (FR)
Appl. No. 17/258,855
Filed by COMMISSARIAT À L'ÉNERGIE ATOMIQUE ET AUX ÉNERGIES ALTERNATIVES, Paris (FR); and SOLVAY FRANCE, Aubervilliers (FR)
PCT Filed Jul. 10, 2019, PCT No. PCT/FR2019/051733
§ 371(c)(1), (2) Date Jan. 8, 2021,
PCT Pub. No. WO2020/012123, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 1856389 (FR), filed on Jul. 11, 2018.
Prior Publication US 2021/0328226 A1, Oct. 21, 2021
Int. Cl. H01M 4/62 (2006.01); H01M 10/04 (2006.01); H01M 10/0525 (2010.01); H01M 10/0565 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01); H01M 10/0585 (2010.01)
CPC H01M 4/623 (2013.01) [H01M 10/0525 (2013.01); H01M 10/0565 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 10/0585 (2013.01); H01M 2300/0085 (2013.01); H01M 2300/0091 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An accumulator with bipolar architecture that comprises two end current collectors between which a stack of n electrochemical cells is disposed, n being an integer at least equal to 2, wherein:
each electrochemical cell comprises a positive electrode, a negative electrode, and an ion-conducting membrane that is interposed between the positive electrode and the negative electrode and comprises a liquid electrolyte included in the positive electrode, the negative electrode, and the ion-conducting membrane;
the n electrochemical cells are separated from each other by n−1 bipolar current collector(s);
and wherein the positive electrode and the negative electrode of each electrochemical cell are gelled electrodes each comprising a composite material comprising a polymer matrix made from at least one gelling polymer (FF), an active electrode material and optionally one or more electron-conducting additives, the polymer matrix trapping the liquid electrolyte, the at least one gelling polymer (FF) being chosen from fluorinated polymers comprising at least one repeating unit issuing from polymerization of a fluorinated monomer and at least one repeating unit issuing from polymerization of a monomer comprising at least one carboxylic acid group, optionally in the form of a salt,
wherein the bipolar current collector(s) and at least one of the end current collectors have at least one face, which accommodates the positive electrode or the negative electrode and which comprises, at a periphery thereof:
at least one free edge of the bipolar current collector(s) not occupied by the positive electrode or negative electrode, and
at least one tongue of the at least one end current collector, which is in contact with the at least one end current collector or extending the same,
the at least one free edge and/or the at least one tongue being metal parts each covered by a layer of insulating material positioned to avoid a direct contact between the metal parts of the bipolar current collector(s) and of the end current collector(s) situated opposite each other, the layer of insulating material not forming an impervious seal to the liquid electrolyte, and
wherein each electrochemical cell is devoid of a physical barrier to the flow of the liquid electrolyte.