US 2016/0104913 A1Published application

Bipolar li-ion battery having improved sealing and associated method of production

AssigneeCommiussariat A L'energie Atomique Et Aux Energies Alternatives

InventorsGilles Moreau, Michaël Bouvier

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Abstract

A bipolar battery having at least two electrochemical cells stacked one on top of the other, the bipolar collector comprising, at the periphery of same, on one of the faces of same, at least one first sealing device comprising one frame made from an electrically insulating and thermosensitive material, and two adhesive frames arranged individually to either side of the thermosensitive frame, the first or the second adjacent collector also comprising, at the periphery of same, on the covered face of same, at least one second sealing device comprising a frame made from an electrically insulating and thermosensitive material, and two adhesive frames arranged individually to either side of the thermosensitive frame, the first and second devices each forming a peripheral wall sealed to the electrolyte of the first or second cell, which surrounds same. According to the invention, each sealed wall is obtained by heat-sealing at least one first and at least one second sealing device on the face of a current collector not provided with a sealing device.

Claims11

Dependent claims

A bipolar battery, of the Li-ion type, comprising:

at least one first and second electrochemical cells stacked on top of one other and each comprising an anode, a cathode and an electrolyte;
at least one bipolar current collector, one face of which is covered with the anode of lithium-based insertion material of the first cell and the opposite face is covered with the cathode of lithium-based insertion material of the second cell, the bipolar collector comprising at its periphery, on one of its faces, at least one first sealing device comprising a frame of an electrically insulating heat-sensitive material, and two frames of adhesive arranged individually on either side of the heat-sensitive frame in a radial direction, perpendicular to the direction of stacking of the cells, the first device constituting a peripheral wall impervious to the electrolyte of the first or second cell, which surrounds the latter;
at least one first current collector adjacent to the bipolar collector, one face of which is covered with the cathode of the first cell;
at least one second current collector adjacent to the bipolar collector, one face of which is covered with the anode of the second cell;
the first or second adjacent collector also comprising, at its periphery, on its covered face, at least one second sealing device comprising a frame of an electrically insulating heat-sensitive material, and two frames of adhesive arranged individually on either side of the heat-sensitive frame in a radial direction, perpendicular to the direction of stacking of the cells, the second device constituting a peripheral wall impervious to the electrolyte of the first or second cell, which surrounds the latter;
each impervious peripheral wall being obtained by a heat-sealing technique of at least one first and at least one second sealing device on the face of a current collector that does not have a sealing device.

3 more elements

A method for making a bipolar battery comprising at least one first and second electrochemical cells stacked on top of one other and each comprising an anode, a cathode and an electrolyte,

a/ producing a bipolar current collector with a face covered with the anode made of lithium-based insertion material of the first cell and the opposite face covered with the cathode made of lithium-based insertion material of the second cell;
b/ producing a first current collector, intended to be adjacent to the bipolar collector, one face of which is covered with the cathode of the first cell;
c/ producing a second current collector, intended to be adjacent to the bipolar collector, one face of which is covered with the anode of the second cell;
d/ at the periphery of the bipolar current collector, on one of its faces, producing at least one first sealing device comprising a frame of an electrically insulating heat-sensitive material, and two frames of adhesive arranged individually on either side of the heat-sensitive frame in a radial direction, perpendicular to the direction of stacking of the cells;
e/ stacking the bipolar current collector with the first or second current collector, interposing a first separator between them, the stacking and interposing being carried out in such a way that the cathode of the first adjacent collector or the anode of the second current collector is opposite respectively to the anode or cathode of the bipolar collector, being separated from the first separator and with bringing the first sealing device into contact with the heat-sensitive frame;
f/ heating the heat-sensitive frame of the first sealing device in contact at the periphery of the collectors;
g/ at the periphery, on its covered face, of the first or second current collector not heat-sealed to the bipolar current collector, producing at least one second sealing device comprising a frame of an electrically insulating heat-sensitive material, and two frames of adhesive arranged individually on either side of the heat-sensitive frame in a radial direction, perpendicular to the direction of stacking of the cells;
h/ stacking the heat-sealed bipolar current collector with the first or second current collector with the first or second current collector that has not been heat-sealed, interposing a second separator between them, the stacking and interposing being carried out in such a way that the cathode of the first adjacent collector or the anode of the second current collector is opposite respectively to the anode or cathode of the bipolar collector, being separated from the second separator and with bringing the second sealing device into contact with the heat-sensitive frame;
i/ heating the heat-sensitive frame of the second sealing device in contact at the periphery of the collectors.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/892,780Filed 14 Apr 2014
Priority: FR 13 5454321 May 2013
Published: 14 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

H01M 10/0418
Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes: with bipolar electrodes
H01M 4/667
Composites: in the form of layers, e.g. coatings
H01M 10/044
Small-sized flat cells or batteries for portable equipment: with bipolar electrodes
H01M 10/0472
Construction or manufacture in general: vertically superposed cells with vertically disposed plates