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US 9,318,748 B2Granted
Bipolar electrochemical Li-ion battery having increased capacity
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorMarianne Chami
Life of this patent
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Abstract
A bipolar lithium-ion electrochemical battery having increased capacity.
Claims16
A bipolar Li-ion electrochemical battery comprising:
- at least two electrochemical compartments arranged adjacent to each other while being electrically connected in series, each of the compartments comprising:
- at least one first electrically conductive substrate acting as a first current collector comprising two faces, wherein a first face supports an electrode according to at least one pattern and the second face supports an electrode according to two patterns at a mutual distance defining an area devoid of patterns, wherein one of the two patterns of the second face is supported in a same area as the pattern of the first face and the first substrate is bent at the area devoid of patterns to obtain a U shape with one pattern from the first face opposite one pattern from the second face;
- at least one second electrically conductive substrate acting as a second current collector comprising two faces, wherein a first face supports an electrode according to at least one pattern and the second face supports an electrode according to two patterns at a mutual distance defining an area devoid of patterns, wherein one of the two patterns of the second face is supported in a same area as the pattern of the first face and the second substrate is bent at the area devoid of patterns to obtain a U shape with one pattern from the first face opposite one pattern from the second face;
- an electrically insulating separator impregnated with an electrolyte and bent according to an accordion shape nested in each of the U shapes of the first and second substrates which are in turn nested in each other, such that the separator impregnated with electrolyte is in contact with each of the electrode patterns;
- wherein, for each of the compartments, at least one of the first and second substrates forming the end substrates has a face with precisely one electrode pattern;
- wherein, for each of the compartments, the electrode patterns of a same substrate have a same polarity;
- wherein, for each of the compartments, the electrode patterns of the second substrate have opposite polarity of those of the electrode of the first substrate;
- wherein all the first or second substrates of one of the compartments are in continuous electrical contact with material continuity with all the second or first substrates of another of the adjacent compartments respectively, via the areas thereof devoid of electrode forming the base of the U shapes;
- wherein the electrode of the substrates of one compartment, in continuous electrical contact, have opposite polarity of those of the substrates of the other adjacent compartment, in continuous electric contact, thus defining a bipolar current collector;
- the battery further comprising an electrically insulating seal arranged on each peripheral edge of each compartment not coated with a substrate or with the continuous electrical contact area with material continuity between substrates, so as to seal the electrolytes and isolate the compartments from ambient air.
7 more elements
A method for producing a bipolar Li-ion electrochemical battery including at least two electrochemical compartments arranged adjacent to each other while electrically connected in series, the method comprising:
- A) for each electrochemical compartment, executing at least once:
- a) depositing, on a first face of an electrically conductive substrate acting as a first current collector, at least one electrode pattern and, on a second face of the first substrate opposite the first face, two electrode patterns having a same sign as the pattern of the first face, wherein the two patterns are at a mutual distance defining an area devoid of patterns and one of the two patterns of the second face is deposited in a same area as the pattern of the first face;
- b) bending the first electrically conductive substrate substantially into a U shape;
- c) implementing a) and b) with a second electrically conductive substrate acting as a second current collector and depositing three electrode patterns having opposite polarity to those deposited on the first substrate;
- dimensions of the first and second substrates after bending being substantially equal to each other;
- d) bending an electrically insulating separator substantially into an accordion shape;
- e) nesting the separator after bending into the first and second substrates, each after bending and nesting in each other such that the accordion-shaped separator fits closely to each electrode pattern and peripheral edges of the substrates;
- f) producing seals on peripheral edges of the end substrates of the compartment and on one of peripheral edges of the substrates not surrounded by the bent substrates, wherein f) is carried out once the separator has been impregnated with an electrolyte;
- B) providing continuous electrical contact with material continuity of all the first or second substrates of one of the compartments with all the second or first of the substrates of another adjacent compartment respectively via the areas thereof devoid of patterns forming the base of the U shapes, wherein the electrode patterns of the substrates of one compartment, in continuous electrical contact, have opposite polarity of those of the substrates of the other adjacent compartment, in continuous electric contact, thus defining a bipolar current collector.
6 more elements
Dependencies are inferred from the claim text.