Assembly for storing electrical energy, and associated production method

Patent metadata

Field	Value
Publication number	US-2016336567-A1
Application number	US-201515110387-A
Country	US
Kind code	A1
Filing date	Jan 6, 2015
Priority date	Jan 7, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

The invention relates to an assembly for storing electrical energy ( 10 ) comprising a storage element ( 16 ) comprising at least one elementary cell ( 18 ) comprising first and second electrode complexes ( 19, 20 ) stacked in a stacking direction ( 21 ), said elementary cell further comprising a first separator ( 26 ) made of a plastic material extending between the first and second electrode complexes, and an outer shell ( 11 ) receiving the storage element ( 16 ), the shell comprising two separate surfaces ( 15, 14 ) forming electrical terminals of the assembly having opposite polarities, the one or more first complexes ( 19 ) being electrically connected to a first terminal ( 15 ) and the one or more second complexes ( 20 ) being electrically connected to a second terminal ( 14 ), in which the element comprises at least one additional layer ( 29, 30 ) extending at least at one end ( 31, 32 ) of the storage element in the stacking direction, each additional layer being made up of a component identical to one of the components of the elementary cell ( 18 ), none of the additional layers of a single end of the storage element being connected to the terminal having the opposite polarity to the terminal to which the electrode complex adjacent to said additional layers is connected.

First claim

1 . An energy storage assembly ( 10 ) including:
an electrical energy storage element ( 16 ) comprising at least one elementary cell ( 18 ) comprising a first and a second electrode complex ( 19 , 20 ) stacked in a stacking direction ( 21 ), said elementary cell further comprising a first separator ( 26 ) made of plastic material extending between the first and the second electrode complex, an external envelope ( 11 ) accommodating the storage element ( 16 ), the envelope including two distinct surfaces ( 15 , 14 ) forming electrical terminals of the assembly having opposite polarity, the first complex(es) ( 19 ) being electrically connected to a first terminal ( 15 ) and the second complex(es) ( 20 ) being electrically connected to a second terminal ( 14 ), the assembly being characterized in that the element includes at least one additional layer ( 29 , 30 ) extending to at least one end ( 31 , 32 ) of the storage element in the stacking direction, each additional layer consisting of a component identical to one of the components ( 19 , 20 , 26 , 27 ) of the elementary cell ( 18 ), none of the additional layers of a same end of the storage element being connected to the terminal of polarity opposite to the terminal to which the electrode complex adjoining said additional layers is connected.

2 . The storage assembly according to claim 1 , wherein the or at least one of the additional layers ( 29 , 30 ) includes an electrode ( 22 , 23 ).

3 . The storage assembly according to any one of claims 1 and 2 , wherein the or at least one of the elementary cells ( 18 ) is provided with at least one collector ( 24 , 25 ) making it possible to connect an electrode complex ( 19 , 20 ) of the cell to the corresponding terminal ( 15 , 14 ), the or at least one of the additional layers ( 29 , 30 ) including a collector ( 24 , 25 ).

4 . The storage assembly according to claims 2 and 3 in combination, wherein the or at least one of the additional layers ( 29 , 30 ) is an electrode complex ( 19 , 20 ) including at least one electrode ( 22 , 23 ) and a collector ( 24 , 25 ) in one single piece.

5 . The storage assembly ( 16 ) according to any one of claims 1 to 4 , wherein the or at least one of the additional layers ( 29 , 30 ) includes a separator ( 26 , 27 ) made of plastic material.

6 . The storage assembly according to one of the previous claims, comprising at one of the ends ( 31 , 32 ) at least, three adjoining additional layers ( 29 ) formed from two layers including an electrode between which is interposed a separator layer.

7 . The storage assembly according to any one of claims 2 to 4 wherein, at one end of the element at least, at least one additional layer ( 29 , 30 ) including an electrode is connected to the terminal of the same polarity as the electrode complex ( 19 , 20 ) adjoining the additional layers of said end.

8 . The storage assembly according to any one of the previous claims, wherein at least one additional layer ( 29 , 30 ) of one of the ends ( 31 , 32 ) is connected neither to the first nor to the second terminal ( 15 , 14 ).

9 . The storage assembly according to any one of the previous claims, wherein the components ( 19 , 20 , 26 , 27 ) of the elementary cell(s) ( 18 ) form piled planar layers, the additional layer(s) ( 29 , 30 ) being placed at one and/or the other of the ends ( 31 , 32 ) of the pile.

10 . The storage assembly according to any one of claims 1 to 8 , wherein the components ( 19 , 20 , 26 , 27 ) of the elementary cell(s) ( 18 ) are coiled up, so that the same component forms a plurality of layers of the coiling and the element ( 16 ) has a shape of a coil, the additional layer(s) ( 29 , 30 ) being placed inside and/or outside the coiling.

11 . The assembly according to claim 10 , wherein the additional layer ( 29 ) located farthest within the coil is a layer including an electrode ( 22 ) and/or a collector ( 24 ).

12 . The assembly according to any one of the previous claims, wherein at least one of the additional layers ( 29 , 30 ) is made using a component ( 19 , 20 , 26 , 27 ) also forming at least one layer of the or of at least one of the elementary cells ( 18 ).

13 . A method for producing an electrical energy storage assembly ( 10 ), comprising the following steps of:
stacking a first electrode complex ( 19 ), a first separator ( 26 ) and a second electrode complex ( 20 ) in a stacking direction ( 21 ), so as to form an elementary cell ( 18 ); constructing the storage element ( 16 ) based on at least one elementary cell ( 18 ) and at least one additional layer ( 29 , 30 ) consisting of a component identical to one of the components of the elementary cell, so that the additional layer(s) are placed at the end ( 31 , 32 ) of the storage element; installing the storage element ( 16 ) in an external envelope ( 11 ) and connecting electrically the storage element to electrical terminals ( 14 , 15 ) of opposite polarity of the storage assembly, formed by two distinct surfaces of the envelope, so that the first complex(es) ( 19 ) is(are) electrically connected to a first terminal ( 15 ) and the second complex(es) ( 20 ) is(are) connected to a second terminal ( 14 ), and none of the additional layers ( 29 , 30 ) located at one end ( 31 , 32 ) of the storage element is connected to the terminal of polarity opposite to the terminal of polarity to which the electrode complex adjoining said additional layers is connected.

14 . The method according to claim 13 , comprising the steps of:
stacking a second separator ( 27 ) on the second electrode complex ( 20 ) in the stacking direction ( 21 ), so as to form an elementary sequence ( 17 ); coiling the elementary sequence around a coiling axis ( 28 ), so that the storage element ( 16 ) has the shape of a coil.

15 . The method according to claim 14 , wherein a portion of the components ( 19 , 26 ) of the elementary sequence ( 17 ) is coiled alone around the coiling axis ( 28 ), so as to form a core of at least one additional layer ( 29 ) around which the elementary sequence is then coiled.

16 . The method according to claim 15 , wherein two components constituted by the first electrode complex ( 19 ) and the first separator ( 26 ) are coiled alone around the coiling axis ( 28 ), so as to form the core of at least one additional layer ( 29 ).

17 . The method according to any one of claims 14 to 16 , wherein a portion of the components ( 20 , 27 ) of the elementary sequence ( 17 ) is coiled alone around the coiling axis ( 28 ) so as to wrap with at least one additional layer ( 30 ) the coil comprising the elementary sequence ( 17 ).

18 . The method according to claim 17 , wherein the second electrode complex ( 20 ) and the second separator ( 27 ) are coiled alone around the coiling axis ( 28 ) so as to wrap the coil with at least one additional layer ( 30 ).

19 . The method according to claim 13 , comprising the steps of:
stacking a second separator ( 27 ) on the second electrode complex ( 20 ) in a piling direction ( 35 ) coinciding with the stacking direction ( 21 ) so as to form an elementary sequence ( 17 ); piling several elementary sequences in the piling direction; piling at least one additional layer ( 29 , 30 ) with at least one elementary sequence, so that the additional layer(s) ( 29 , 30 ) is(are) located at one end ( 31 , 32 ) at least of the pile previously formed in the piling direction.

Assignees

• Blue Solutions

Inventors

• Vigneras Erwan

Classifications

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01G11/76

  specially adapted for integration in multiple or stacked hybrid or EDL capacitors · CPC title

• H01M2/024

  Electricity · mapped topic

• H01M2/1653 Primary

  Electricity · mapped topic