Assembly comprising an electrochemical element and a rechargeable electrical element, and associated manufacturing method

Abstract

The invention relates to a pouch-type rechargeable electrical element (40) comprising a second bundle (43) comprising a first electrode, a second electrode and at least one separator, the second bundle (43) being wound in a spiral about a second central axis (B-B') coaxial to the first central axis (A-A') and around the outer tubular wall (24) of the electrochemical element (20).

Description

[0001] TITLE: Assembly comprising an electrochemical element and a rechargeable electrical element and associated manufacturing method

[0002] The present invention relates to an assembly comprising:

[0003] - a first electrochemical element comprising:

[0004] - a container extending along a first central axis, the container comprising an external tubular wall extending around the first central axis and delimiting an interior volume; and

[0005] - a first electrochemical beam received in the interior volume;

[0006] - a rechargeable electrical element electrically connected to the first electrochemical element;

[0007] US 2015 / 303538 A1 discloses an assembly comprising an electrochemical element and a rechargeable electrical element electrically connected to the electrochemical element. In this document, the electrochemical element is a prismatic electrochemical element of the lithium-ion type. The rechargeable electrical element is a capacitor.

[0008] In such an assembly, the rechargeable electrical element also has a prismatic shape and is arranged laterally relative to the electrochemical element to form an assembly of generally parallelepiped shape.

[0009] However, such an arrangement has disadvantages when the electrochemical element is a cylindrical electrochemical element. In particular, the arrangement of a prismatically shaped rechargeable electrical element in combination with the cylindrical electrochemical element has a large footprint and a spatial geometry which makes its integration into an electrical system, for example a battery compartment, complex.

[0010] An aim of the invention is then to propose an assembly comprising an electrochemical element and a rechargeable electrical element, the size of which is reduced and the geometry of which in space facilitates its integration into an electrical system.

[0011] To this end, the subject of the invention is an assembly of the aforementioned type in which the rechargeable electrical element is a pouch-type element comprising at least one second bundle comprising at least one first electrode of first polarity, at least one second electrode of second polarity opposite to the first polarity and at least one separator separating said at least one first electrode and said at least one second electrode, the at least one second bundle being wound in a spiral around a second central axis coaxial with the first central axis and around the external tubular wall of the first electrochemical element.

[0012] Winding at least one bundle of pouch-type elements in a spiral around the second central axis coaxial with the first central axis and around the external tubular wall of the electrochemical element makes it possible to obtain an assembly with reduced bulk. The assembly obtained is also compact because it avoids the need for a rechargeable electrical element remote from the electrochemical element.

[0013] Such winding also makes it possible to obtain an assembly having a general cylindrical shape, particularly suitable for integrating the assembly into an electrical system, for example of the battery compartment type.

[0014] According to other advantageous aspects of the invention, the assembly comprises one or more of the following characteristics, taken individually or in all technically possible combinations:

[0015] - the first electrochemical element is a primary electrochemical element;

[0016] - the first electrochemical element is a secondary electrochemical element, for example of the lithium-ion type or the sodium-ion type;

[0017] - the external tubular wall of the first electrochemical element is cylindrical with a circular cross-section or an oblong cross-section;

[0018] - the rechargeable electrical element comprises an inner tubular wall extending around the second central axis and around the outer tubular wall of the container of the first electrochemical element, the at least one second bundle being wound on the inner tubular wall of the rechargeable electrical element;

[0019] - the rechargeable electrical element comprises a first sheet having a first longitudinal edge, a second longitudinal edge opposite the first longitudinal edge and a longitudinal strip-shaped portion located between the first longitudinal edge and the second longitudinal edge, the first sheet being wound so that the first longitudinal edge of the first sheet coincides with the longitudinal strip-shaped portion of the first sheet along a first joining line substantially parallel to the second central axis to form the inner tubular wall of the rechargeable electrical element, the rechargeable electrical element further comprising at least one first fixing element arranged so as to fix said first longitudinal edge of the first sheet on said longitudinal strip-shaped portion of the first sheet along the first joining line;

[0020] - the first fastening element is a sealing strip extending substantially parallel to the second central axis and welded to the first longitudinal edge and the longitudinal strip-shaped portion of the first sheet along the first joining line;

[0021] - the first sheet further comprises a drive portion delimited between the second longitudinal edge of the first sheet and the longitudinal strip-shaped portion of the first sheet, the drive portion being able to extend radially towards the second central axis, the internal tubular wall of the rechargeable electrical element being able to be driven in rotation around the second central axis during the winding of the at least one second bundle on the internal tubular wall of the rechargeable electrical element by driving the drive portion;

[0022] - the rechargeable electrical element comprises an external tubular wall extending around the second central axis and around the internal tubular wall of the rechargeable electrical element, the internal and external tubular walls of the rechargeable electrical element radially delimiting an annular space for receiving the at least one second bundle;

[0023] - the external tubular wall comprises an electrically insulating material;

[0024] - the external tubular wall is formed by a multi-layer film comprising two layers of plastic material and a metal layer, preferably aluminum, sandwiched between the two layers of plastic material;

[0025] - the rechargeable electrical element comprises a second sheet wound such that two opposite longitudinal edges of the second sheet coincide along a second joining line substantially parallel to the second central axis to form the outer tubular wall of the rechargeable electrical element, the rechargeable electrical element further comprising at least one second fixing element arranged to fix together the two opposite longitudinal edges of the second sheet along the second joining line;

[0026] - the second fixing element is a sealing strip extending substantially parallel to the second central axis and welded to the two opposite longitudinal edges of the second sheet along the second joining line;

[0027] - the rechargeable electrical element is a capacitor, a hybrid capacitor or a second electrochemical element, in particular a secondary electrochemical element, for example of the lithium-ion type or of the sodium-ion type; and - the first electrochemical element has an energy density greater than that of the rechargeable electrical element and the rechargeable electrical element has a power density greater than that of the first electrochemical element.

[0028] The invention also relates to a method of manufacturing an assembly as described above, comprising the following steps:

[0029] - supply of the first electrochemical element;

[0030] - spiral winding of the at least one second bundle around the second central axis;

[0031] - arranging the first electrochemical element such that the second central axis is coaxial with the first central axis and the at least one second bundle is spirally wound around the outer tubular wall of the first electrochemical element.

[0032] According to other advantageous aspects of the invention, the manufacturing method comprises one or more of the following characteristics, taken individually or in all technically possible combinations:

[0033] - the method further comprises, prior to the winding step, the production of an internal tubular wall of the rechargeable electrical element, the at least one second bundle being wound on the internal tubular wall of the rechargeable electrical element during the winding step;

[0034] - the production of the internal tubular wall of the rechargeable electrical element includes:

[0035] - rolling a first sheet having a first longitudinal edge, a second longitudinal edge opposite the first longitudinal edge and a longitudinal strip-shaped portion located between the first longitudinal edge and the second longitudinal edge, so as to make the first longitudinal edge coincide with the longitudinal strip-shaped portion along a first joining line parallel to the second central axis to form the internal tubular wall of the rechargeable electrical element;

[0036] - arranging a first fixing element so as to fix said first longitudinal edge on said longitudinal strip-shaped portion along the first joining line; the winding step comprising driving the inner tubular wall of the rechargeable electrical element in rotation about the second axis of rotation by driving a driving portion of the first sheet extending radially towards the second central axis, the driving portion being delimited between the second longitudinal edge of the first sheet and the longitudinal strip-shaped portion, to wind the at least one second bundle on the inner tubular wall of the rechargeable electrical element;and - the method further comprises, after the winding step, producing an external tubular wall of the rechargeable electrical element so that the at least one second bundle extends into an annular receiving space delimited radially by the internal and external tubular walls of the rechargeable electrical element.;

[0037] The invention will appear more clearly on reading the description which follows, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0038] [Fig 1] Figure 1 is a simplified schematic representation of a perspective view of an assembly according to the invention;

[0039] [Fig 2] Figure 2 is a simplified schematic representation of a perspective view of the whole of Figure 1, exploded;

[0040] [Fig 3] Figure 3 is a simplified schematic representation of a sectional view of the assembly of Figure 1, along section plane III-III;

[0041] [Fig 4] Figure 4 is a simplified schematic representation of a sectional view of the assembly of Figure 1, according to section plane IV-IV;

[0042] [Fig 5] Figure 5 is a simplified schematic representation of a perspective view of the assembly of Figure 1, in which the first electrochemical element is omitted;

[0043] [Fig 6] Figure 6 is a simplified schematic representation of the internal tubular wall of the rechargeable electrical element and of a first fixing element of the assembly of Figure 1, according to a section plane substantially perpendicular to the second central axis;

[0044] [Fig 7] Figure 7 is a simplified schematic representation of a method of manufacturing the assembly of Figure 1, according to the invention.

[0045] In the following, unless otherwise indicated:

[0046] - the expressions “axial”, “radial”, “circumferentially” refer to the axis of the element concerned;

[0047] - by "tubular" we mean the shape of a tube, that is to say the shape of a conduit of any cross section, open at one end or both;

[0048] - by "cylindrical" we mean the shape of a cylinder, that is to say a surface equal to the union of all the parallel generators (parallel lines) intersecting a directrix (directrix curve);

[0049] - by "neutral fiber" of a part extending along an axis, we mean a line passing through the center of gravity of the straight sections (relative to said axis) of said part.

[0050] With reference to Figures 1 to 6, an assembly 10 according to the invention is described. The assembly 10 is adapted to supply electricity to an electrical device (not shown). The assembly 10 is manipulated autonomously. The constituent elements of the assembly 10 do not separate from each other, in particular at least under the effect of the force of gravity.

[0051] The assembly 10 comprises a first electrochemical element 20 and a rechargeable electrical element 40.

[0052] According to a particular example, the assembly 10 further comprises a power supply connection (not shown). The power supply connection comprises, for example, a first electrical terminal of first polarity and a second electrical terminal of second polarity opposite to the first polarity. The power supply connection is in particular electrically connected to the first electrochemical element 20 and to the rechargeable electrical element 40. The power supply connection is in particular intended to transmit electrical energy from the first electrochemical element 20 and / or the rechargeable electrical element 40 to the electrical device (not shown).

[0053] The first electrochemical element 20 is, for example, a primary electrochemical element. Alternatively, the first electrochemical element 20 is a secondary electrochemical element, for example of the lithium-ion type or of the sodium-ion type.

[0054] The primary electrochemical element is a non-rechargeable electrochemical element, also referred to as a "battery", in particular an element of the lithium - thionyl chloride type (Li-SOCh), lithium - manganese dioxide (Li-MnC^), lithium - sulfur dioxide (U-SO2), lithium - carbon monofluoride (Li-CFx), lithium - sulfuryl chloride (U-SO2CI2), or mixtures of these components or any alkaline battery.

[0055] For example, the first electrochemical element 20 has a shape corresponding to that of a standard cell of type A, AA, AAA, AAAA, 1 / 2AA, 2 / 3A, 2 / 3AA, C, D, DD, 3LR12 / 3R12, or E.

[0056] For example, the first electrochemical element 20 has an energy density of between 100 Wh / kg and 600 Wh / kg, in particular between 500 Wh / kg and 600 Wh / kg. For example, the rechargeable electrical element 40 has an energy density of between 10 Wh / kg and 300 Wh / kg.

[0057] Advantageously, the energy density of the first electrochemical element 20 is greater than the energy density of the rechargeable electrical element 40.

[0058] For example, the first electrochemical element 20 has a power density of between 1 W / kg and 500 W / kg, in particular between 25 W / kg and 100 W / kg, in particular substantially equal to 50 W / kg. For example, the rechargeable electrical element 40 has a power density of between 200 W / kg and 900 W / kg, in particular between 500 W / kg and 900 W / kg.

[0059] Advantageously, the power density of the first electrochemical element 20 is lower than the power density of the rechargeable electrical element 40.

[0060] For example, as will be detailed below, the first electrochemical element 20 is fixed to the rechargeable electrical element 40 by gluing or by force-fitting.

[0061] For example, the first electrochemical element 20 comprises a container 22 extending along a first central axis A-A'.

[0062] In particular, with reference to figures 1 to 4, the container 22 comprises an external tubular wall 24 extending around the first central axis A-A' and two front end walls 26, 28.

[0063] The external tubular wall 24 is in particular cylindrical. Advantageously, the corresponding cylinder is straight. Also advantageously, the directrix of the corresponding cylinder is closed. Also advantageously, the directrix of the corresponding cylinder is at least continuous and at least differentiable over its entire domain.

[0064] For example, the external tubular wall 24 has a neutral fiber coinciding with the first central axis A-A'.

[0065] According to the example illustrated in Figures 1 to 4, the external tubular wall 24 is cylindrical with a circular cross-section. The first central axis A-A' then corresponds to the axis of the corresponding cylinder (in other words the axis of revolution of the cylinder of revolution).

[0066] According to a non-illustrated alternative, the outer tubular wall 24 is cylindrical with an oblong cross-section, for example in the shape of a rounded rectangle, a rounded square, or a squircle. By "squircle" is meant the mathematical shape intermediate between the square and the circle.

[0067] The external tubular wall 24 delimits, in particular with the two front end walls 26, 28, an interior volume 30.

[0068] The end front walls 26, 28 extend substantially perpendicularly to the first central axis A-A'. These end walls 26, 28 have external faces which respectively comprise a pole surface of a first polarity and a pole surface of a second polarity opposite to the first polarity.

[0069] With reference to Figure 3, the container 22 extends along the first central axis A-A' between a first end 27 and a second end 29. The container 22 has a length L1 measured along the first central axis A-A' between the first end 27 and the second end 29. With reference to Figures 3 and 4, the first electrochemical element 20 comprises a first electrochemical bundle 32 received in the interior volume 30.

[0070] For example, the first electrochemical bundle comprises at least one first electrode of first polarity, at least one second electrode of second polarity opposite to the first polarity and at least one separator separating said at least one first electrode and said at least one second electrode.

[0071] The rechargeable electrical element 40 is, advantageously, a capacitor, a hybrid capacitor or a second electrochemical element, in particular a secondary electrochemical element, for example of the lithium-ion type or the sodium-ion type.

[0072] In the case of a capacitor or a hybrid capacitor, the rechargeable electrical element 40 has, for example, a capacitance of between 8pF and 1000 F.

[0073] The capacitor can be a "supercapacitor" or "electrochemical double layer capacitor" (EDLC), or "ultracapacitor". The capacitor is a device for storing energy by accumulating ions on two electrodes serving as ion collectors when a potential difference is imposed between them. The energy storage in a (super-) capacitor is of electrostatic origin, and not electrochemical as in the case of accumulators. The hybrid capacitor can be a hybrid capacitor, with a positive electrode of the supercapacitor type based on activated carbon, and a negative electrode of the lithium-ion type with a sheet structure and which inserts / deinserts lithium ions.

[0074] In the case where the rechargeable electrical element 40 is a secondary electrochemical element, it has a capacity of between 0.1 Ah and 1 Ah.

[0075] The rechargeable electrical element 40 is electrically connected to the first electrochemical element 20, for example in parallel. For example, the rechargeable electrical element is electrically connected to the first electrochemical element 20 by connecting a first electrical terminal 41A of a first polarity of the rechargeable electrical element 40 with the pole surface of the first polarity of the first electrochemical element 20 and by connecting a second electrical terminal 41B of a second polarity opposite to the first polarity, of the rechargeable electrical element 40 with the pole surface of the second polarity of the first electrochemical element.

[0076] According to a non-illustrated variant, the rechargeable electrical element 40 is electrically connected to the first electrochemical element 20 by electrical contact between the outer tubular wall 24 of the first electrochemical element 20 and an inner tubular wall 42 of the rechargeable electrical element 40. According to this variant, the outer tubular wall 24 and the inner tubular wall 42 are at least partially formed by an electrically conductive material. In this non-illustrated variant, in comparison with the embodiment described mainly with reference to the figures, the inner tubular wall 42 is in particular functionalized to make it conductive.

[0077] With reference to Figures 3 and 4, the rechargeable electrical element 40 is an element, in particular electrochemical and / or electrostatic, of the pouch type comprising at least one second bundle 43 comprising at least one first electrode of first polarity, at least one second electrode of second polarity opposite to the first polarity and at least one separator separating said at least one first electrode and said at least one second electrode. Advantageously, when the rechargeable electrical element is an electrochemical element, the rechargeable electrical element 40 further comprises an electrolyte in which the at least one first electrode, the at least one second electrode and the at least one separator are at least partially immersed. In particular, the electrolyte is contained in an annular space 60 for receiving the second bundle 43.

[0078] With reference to figures 1 to 5, the at least one second bundle 43 is wound in a spiral around a second central axis B-B' coaxial with the first central axis A-A', in particular when the first electrochemical element 20 is arranged in a central receiving volume 45 delimited by the rechargeable electrical element 40, and around the external tubular wall 24 of the first electrochemical element 20. In particular, the at least one first electrode, the at least one second electrode and the at least one separator of the at least one second bundle 43 are wound in a spiral ("jelly roll" in English).

[0079] In particular, the at least one second bundle 43 is wound on the internal tubular wall 42 of the rechargeable electrical element 40, described in more detail below.

[0080] According to the example illustrated in Figures 1 to 5, in its spirally wound form, the at least one second beam 43 extends along the second central axis B-B' between a first end 37 and a second end 38. With reference to Figure 3, the at least one second beam 43 has a length L2 measured along the second central axis B-B' between the first end 37 and the second end 38. According to the example illustrated in Figures 1 to 5, the length L2 is less than or equal to the length L1. In a non-illustrated variant, the length L2 is greater than or equal to the length L1. Again in a non-illustrated variant, the length L2 is substantially equal to the length L1.

[0081] Advantageously, with reference to figures 1 to 3 and 5, the rechargeable electrical element 40 comprises the first electrical terminal 41 A and the second electrical terminal 41 B of second polarity.

[0082] Still advantageously, with reference to Figures 1 to 5, the rechargeable electrical element 40 comprises the inner tubular wall 42, an outer tubular wall 62, and two annular end assemblies 80A, 80B. In particular, the rechargeable electrical element 40 comprises a first sheet 44 and a second sheet 64.

[0083] Advantageously, the rechargeable electrical element 40 comprises the annular space 60 for receiving the at least one second beam 43.

[0084] Advantageously, the rechargeable electrical element 40 comprises at least one first fixing element 56 and at least one second fixing element 76.

[0085] The first electrical terminal 41A is electrically connected to the at least one first electrode of first polarity of the at least one second bundle 43. As illustrated in the example of FIGS. 1 to 5, the first electrical terminal 41A is a connection tab. Still according to this example, the first electrical terminal 41A extends substantially parallel to the second central axis B-B' in a first direction D1. Advantageously, the first electrical terminal 41A extends through an axial passage 82 of a first annular end assembly 80A from the annular space 60 for receiving the at least one second bundle 43 to outside said annular space 60.

[0086] The second electrical terminal 41 B is electrically connected to the at least one second electrode of second polarity of the at least one second bundle 43. As illustrated in the example of FIGS. 1 to 5, the second electrical terminal 41 B is a connection tab. Still according to this example, the second electrical terminal 41 B extends substantially parallel to the second central axis B-B' in a second direction D2 opposite to the first direction D1. Advantageously, the second electrical terminal 41 B extends through an axial passage 82 of a second annular end assembly 80B from the annular space 60 for receiving the at least one second bundle 43 to outside said annular space 60.

[0087] With reference to Figures 3 to 5, the inner tubular wall 42 extends around the second central axis B-B' and around the outer tubular wall 24 of the container 22 of the first electrochemical element 20.

[0088] Advantageously, the internal tubular wall 42 delimits the central volume 45 for receiving the first electrochemical element 20.

[0089] Still advantageously, the inner tubular wall 42 is applied against the outer tubular wall 24 of the first electrochemical element 20, in particular when the first electrochemical element 20 is arranged in the central volume 45 (as illustrated in FIGS. 1, 3 and 4). In particular, when the first electrochemical element 20 is arranged in the central volume 45, the inner tubular wall 42 matches the shape of the outer tubular wall 24 of the first electrochemical element 20. This makes it possible to obtain a particularly compact assembly 10. Still advantageously, in the example where the first electrochemical element 20 is fixed to the rechargeable electrical element 40 by gluing, the outer tubular wall 24 of the first electrochemical element 20 is glued to the inner tubular wall 42 of the rechargeable electrical element 40.In the variant where the first electrochemical element 20 is fixed to the rechargeable electrical element 40 by force-fitting, the external tubular wall 24 of the first electrochemical element 20 is held by clamping in the central volume 45 by the internal tubular wall 42 of the rechargeable electrical element 40. In the particular example where the rechargeable electrical element 40 is electrically connected to the first electrochemical element 20 by electrical contact between the external tubular wall 24 of the first electrochemical element 20 and an internal tubular wall 42 of the rechargeable electrical element 40, the first electrochemical element 20 is fixed to the rechargeable electrical element 40 by force-fitting, which ensures optimal electrical contact between the walls 24 and 42.

[0090] The internal tubular wall 42 is in particular cylindrical. Advantageously, the corresponding cylinder is straight. Also advantageously, the directrix of the corresponding cylinder is closed. Also advantageously, the directrix of the corresponding cylinder is at least continuous and at least differentiable over its entire domain.

[0091] For example, the internal tubular wall 42 has a neutral fiber coinciding with the second central axis B-B'.

[0092] According to the example illustrated in Figures 1 to 6, the internal tubular wall 42 is cylindrical with a circular cross-section. The second central axis B-B' then corresponds to the axis of the corresponding cylinder (in other words the axis of revolution of the cylinder of revolution).

[0093] In the non-illustrated alternative where the external tubular wall 24 of the first electrochemical element 20 is cylindrical with an oblong cross-section, the internal tubular wall 42 is cylindrical with an oblong cross-section with a shape corresponding in particular to that of the cross-section of the external tubular wall 24.

[0094] Advantageously, the shape of the cross section of the internal tubular wall 42 and the shape of the cross section of the external tubular wall 24 are substantially identical, in particular so that when the first electrochemical element 20 is arranged in the central volume 45, the internal tubular wall 42 matches the shape of the external tubular wall 24 of the first electrochemical element 20.

[0095] Advantageously, the internal tubular wall 42 comprises an electrically insulating material, particularly suitable for the manufacture of accumulators. For example, the electrically insulating material has a resistivity greater than or equal to 1 MO.

[0096] More advantageously, the internal tubular wall 42 is formed by a multi-layer film comprising two insulating layers, for example of plastic material, and a metal layer, preferably of aluminum, sandwiched between the two insulating layers. The multi-layer film is for example an EL408PH™ film from the company DNP.

[0097] The internal tubular wall 42 is capable of being driven in rotation around the second central axis B-B' during a winding of the at least one second bundle 43 of the rechargeable electrical element 40 on the internal tubular wall 42 of the rechargeable electrical element 40 by driving, in particular in rotation around the second central axis B-B', a drive portion 58 of the first sheet 44.

[0098] With reference to Figures 5 and 6, the first sheet 44 has a first longitudinal edge 46, a second longitudinal edge 48 opposite the first longitudinal edge 46 and a portion 50 in the form of a longitudinal strip located between the first longitudinal edge 46 and the second longitudinal edge 48. The portion 50 is in particular at a certain distance from each of the first and second longitudinal edges 46, 48.

[0099] Advantageously, the first sheet 44 further comprises the drive portion 58.

[0100] As illustrated in the example of Figures 5 and 6, the first sheet 44 is wound so that the first longitudinal edge 46 coincides with the portion 50 along a first joining line 54 substantially parallel to the second central axis B-B' to form the inner tubular wall 42. In other words, the portion of the wound first sheet 44, delimited by the first longitudinal edge 46 and the portion 50, forms the inner tubular wall 42.

[0101] Advantageously, the first sheet 44 is formed by the multi-layer film.

[0102] The at least one first fixing element 56 is arranged so as to fix the first longitudinal edge 46 on the portion 50 of the first sheet 44, along the first joining line 54.

[0103] The at least one first fixing element 56 is, for example, a sealing strip extending substantially parallel to the second central axis B-B' and welded to the first longitudinal edge 46 and to the portion 50 of the first sheet 44. The sealing strip makes it possible to ensure the sealing of the internal tubular wall 42 with respect to the contents of the annular space 60.

[0104] The drive portion 58 is in particular delimited between the second longitudinal edge 48 of the first sheet 44 and the portion 50 of the first sheet 44.

[0105] As illustrated in the example of Figures 5 and 6, the drive portion 58 is able to extend radially towards the second central axis B-B', in particular when the first electrochemical element 20 is released from the central receiving volume 45 delimited by the internal tubular wall 42. Advantageously, the drive portion 58 is pressed against the internal tubular wall 42, in particular between the internal tubular wall 42 and the external tubular wall 24 of the first electrochemical element 20, when the first electrochemical element 20 is arranged in the central volume 45.

[0106] With reference to figure 5, the drive portion 58 has for example a length D measured between the second longitudinal edge 48 and the portion 50 of the first sheet 44 greater than or equal to 4 mm and less than or equal to a base perimeter of the internal tubular wall 42 when the latter is a cylindrical wall with a circular cross section.

[0107] With reference to Figures 1 to 5, the outer tubular wall 62 extends around the second central axis B-B' and around the inner tubular wall 42.

[0108] The external tubular wall 62 is in particular cylindrical. Advantageously, the corresponding cylinder is straight. Also advantageously, the directrix of the corresponding cylinder is closed. Also advantageously, the directrix of the corresponding cylinder is at least continuous and at least differentiable over its entire domain.

[0109] For example, the outer tubular wall 62 has a neutral fiber coinciding with the second central axis B-B'.

[0110] According to the example illustrated in Figures 1 to 6, the external tubular wall 62 is cylindrical with a circular cross-section. The second central axis B-B' then corresponds to the axis of the corresponding cylinder (in other words the axis of revolution of the cylinder of revolution).

[0111] In the non-illustrated alternative where the external tubular wall 24 of the first electrochemical element 20 and the internal tubular wall 42 of the rechargeable electrical element are cylindrical with an oblong cross-section, the external tubular wall 62 is cylindrical with an oblong cross-section with a shape corresponding in particular to that of the respective cross-sections of the walls 24, 42.

[0112] With reference to figures 3 and 4, the external tubular wall 62 and the internal tubular wall 42 radially delimit, in particular between them, an annular space 60 for receiving the at least one second bundle 43.

[0113] Advantageously, as illustrated in Figures 1 to 4, the external tubular wall 62 forms an external envelope 14 of the assembly 10.

[0114] Advantageously, the external tubular wall 62 comprises an electrically insulating material, particularly suitable for the manufacture of accumulators. For example, the electrically insulating material has a resistivity greater than or equal to 1 MO. This characteristic simplifies the assembly 10 since it is then possible to avoid adding a dedicated insulating sheath around the rechargeable electrical element 40.

[0115] More advantageously, the external tubular wall 62 is formed by a multi-layer film comprising two insulating layers, for example of plastic material, and a metal layer, preferably of aluminum, sandwiched between the two insulating layers. The multi-layer film is for example an EL408PH™ film from the company DNP.

[0116] Advantageously, with reference to FIG. 1, the second sheet 64 comprises a first longitudinal edge 66 and a second longitudinal edge 68 opposite the first longitudinal edge 66.

[0117] The second sheet 64 is wound such that the first longitudinal edge 66 and the second longitudinal edge 68 coincide along a second joining line 74 substantially parallel to the second central axis B-B' to form the outer tubular wall 62 of the rechargeable electrical element 40. In other words, the wound second sheet 64 forms the outer tubular wall 62.

[0118] Advantageously, the second sheet 64 is formed by the multi-layer film.

[0119] Referring to Figures 1 and 4, the at least one second fastening element 76 is arranged to fasten together the two opposite longitudinal edges 66, 68 of the second sheet 64 along the second joining line 74.

[0120] The at least one second fixing element 76 is for example a sealing strip extending substantially parallel to the second central axis B-B' and welded to the two opposite longitudinal edges 66, 68 of the second sheet 64 along the second junction line 74. The sealing strip makes it possible to ensure the sealing of the external tubular wall 62 with respect to the contents of the annular space 60.

[0121] With reference to figures 2 to 5, the annular end assemblies 80A, 80B axially delimit the annular space 60 for receiving the at least one second beam 43.

[0122] According to the example illustrated in Figures 2 to 5, each annular end assembly 80A, 80B comprises an axial passage 82 (Figures 3 to 5) through which the first electrical terminal 41A or the second electrical terminal 41B extends. In particular, each axial passage 82 is formed by an axial passage 86 of an annular spacer 84 of the corresponding annular end assembly 80A, 80B and by an axial passage 92 of a spacer ring 90 of the corresponding annular end assembly 80A, 80B.

[0123] In particular, the end annular assemblies 80A, 80B are fixed to the inner 42 and outer 62 tubular walls in a sealed manner, so as to prevent any leakage of any electrolyte contained in the annular space 60.

[0124] Advantageously, each annular end assembly 80A, 80B comprises at least one annular spacer 84.

[0125] The at least one annular spacer 84 is mounted, in particular welded, on the inner 42 and outer 62 tubular walls respectively and extends between the inner 42 and outer 62 tubular walls. According to the example of FIGS. 3 to 5, each annular spacer 84 comprises an axial passage 86, for example an axial orifice, for the passage of an electrical terminal 41 A,

[0126] 41 B.

[0127] Advantageously, each annular end assembly 80A, 80B further comprises at least one spacer ring 90.

[0128] In particular, each spacer ring 90 is mounted on the corresponding annular spacer 84, between the inner 42 and outer 62 tubular walls.

[0129] In particular, according to the example of figures 3 to 5, each spacer ring 90 comprises an axial passage 92, for example an axial groove, for the passage of an electrical terminal 41 A, 41 B. The axial passage 92 of each spacer ring 90 communicates in particular with the axial passage 86 of the corresponding annular spacer 84.

[0130] With reference to Figure 3, the at least one spacer ring 90 makes it possible to ensure a certain thickness E of annular space 60, measured radially relative to the second central axis B-B', between the internal tubular wall 42 and the external tubular wall 62 of the rechargeable electrical element. The thickness E is for example between 0.5 mm and 100 mm, preferably between 0.5 mm and 5 mm.

[0131] Advantageously, as illustrated in Figures 2 to 4, for each annular end assembly 80A, 80B, the at least one spacer ring 90 is arranged axially closer to the at least one second beam 43 than is the at least one annular spacer 84.

[0132] Mounting each spacer ring 90 on the corresponding annular spacer 84 and welding the annular spacer 84 to the internal tubular walls

[0133] 42 and external 62 ensures sealing with respect to the contents of the annular space 60 for receiving the at least one second bundle 43.

[0134] With reference to FIG. 7, a method 100 for manufacturing the assembly 10, according to the invention, is described.

[0135] The method 100 comprises a step 110 of providing the first electrochemical element 20.

[0136] Advantageously, the method 100 then comprises the production 120 of an internal tubular wall 42 of the rechargeable electrical element 40.

[0137] Still advantageously, the embodiment 120 of the inner tubular wall 42 of the rechargeable electrical element 40 comprises the rolling 121 of the first sheet 44 so as to make the first longitudinal edge 46 coincide with the portion 50 in the form of a longitudinal strip along the first junction line 54 to form the inner tubular wall 42 of the rechargeable electrical element 40. In particular, the embodiment 120 of the inner tubular wall 42 of the rechargeable electrical element 40 then comprises the arrangement 122 of the first fixing element 56 so as to fix the first longitudinal edge 46 on the portion 50 in the form of a longitudinal strip along the first junction line 54.

[0138] The method 100 then comprises a step 130 of spirally winding the at least one second bundle 43 around the second central axis B-B', in particular on the internal tubular wall 42 of the rechargeable electrical element 40.

[0139] Advantageously, the winding step 130 comprises driving the internal tubular wall 42 of the rechargeable electrical element 40 in rotation around the second axis of rotation B-B' by driving the drive portion 58 of the first sheet 44 to wind the at least one second bundle 43 onto the internal tubular wall 42.

[0140] Still advantageously, the method 100 further comprises, after the winding step 130, the production 140 of the external tubular wall 62 of the rechargeable electrical element 40 so that the at least one second bundle 43 extends into the annular space 60 for receiving the second bundle 43.

[0141] For example, the embodiment 140 of the external tubular wall 62 of the rechargeable electrical element 40 comprises the rolling 141 of the second sheet 64, in particular around the second bundle 43 wound in a spiral, so as to make the two opposite longitudinal edges 66, 68 coincide along the second junction line 74 to form the external tubular wall 62 of the rechargeable electrical element 40.

[0142] In particular, the embodiment 140 of the external tubular wall 62 of the rechargeable electrical element 40 then comprises the arrangement 142 of the second fixing element 76 so as to fix together the two opposite longitudinal edges along the second joining line 74.

[0143] Advantageously, the method 100 then comprises a step 150 of mounting the two annular end assemblies 80A, 80B, in particular axially on either side of the at least one second beam 43.

[0144] In particular, step 150 comprises the fixing 151 of the first annular end assembly 80A to the inner 42 and outer 62 tubular walls then the fixing 152 of the second annular end assembly 80B, in particular so that each electrical terminal 41 A, 41 B extends through the corresponding axial passage 82.

[0145] Advantageously, the method 100 further comprises, between steps 151 and 152, a step of filling the annular space 60 for receiving the at least one second bundle 43 with an electrolyte.

[0146] The method 100 then comprises a step 160 of arranging the first electrochemical element 20 so that the second central axis B-B' is coaxial with the first central axis A-A', in particular in the central receiving volume 45, and that the at least one second bundle 43 is wound in a spiral around the external tubular wall 24 of the first electrochemical element 20.

[0147] According to a non-illustrated variant, the first electrical terminal 41 A and the second electrical terminal 41 B of the rechargeable electrical element 40 both extend in the first direction D1 or in the second direction D2. The first and second electrical terminals 41 A, 41 B then each extend respectively in two respective axial passages 82 of one or the other of the two annular end assemblies 80 from the annular space 60 for receiving the at least one second bundle 43 to outside said annular space 60.

[0148] According to another variant not illustrated, the first electrical terminal 41 A or the second electrical terminal 41 B of the rechargeable electrical element 40 extends substantially perpendicular to the second central axis B-B' through a passage delimited by the first longitudinal edge 46 and the portion 50 in the form of a longitudinal strip of the first sheet 44, in particular parallel to the drive portion 58. According to this variant, said first electrical terminal 41 A or second electrical terminal 41 B is advantageously electrically connected directly to the external tubular wall 24 of the first electrochemical element 20, which in this variant is advantageously formed by an electrically conductive material.

Claims

DEMANDS 1. Set (10) comprising: - a first electrochemical element (20) comprising: - a container (22) extending along a first central axis (A-A'), the container (22) comprising an external tubular wall (24) extending around the first central axis (A-A') and delimiting an internal volume (30); and - a first electrochemical beam (32) received in the internal volume (30); - a rechargeable electrical element (40) electrically connected to the first electrochemical element (20); characterized in that the rechargeable electrical element (40) is a pouch-type element comprising at least one second bundle (43) having at least one first electrode of first polarity, at least one second electrode of second polarity opposite to the first polarity and at least one separator separating said at least one first electrode and said at least one second electrode, the at least one second bundle (43) being spirally wound around a second central axis (B-B') coaxial to the first central axis (A-A') and around the outer tubular wall (24) of the first electrochemical element (20).

2. Assembly (10) according to claim 1, wherein the first electrochemical element (20) is a primary electrochemical element.

3. Assembly (10) according to claim 1, wherein the first electrochemical element (20) is a secondary electrochemical element, for example of the lithium-ion type or the sodium-ion type.

4. Assembly (10) according to any one of the preceding claims, wherein the outer tubular wall (24) of the first electrochemical element (20) is cylindrical with a circular cross-section or with an oblong cross-section.

5. Assembly (10) according to any one of the preceding claims, wherein the rechargeable electrical element (40) comprises an internal tubular wall (42) extending around the second central axis (B-B') and around the external tubular wall (24) of the container (22) of the first electrochemical element (20), at least a second bundle (43) being wound around the internal tubular wall (42) of the rechargeable electrical element (40).

6. Assembly (10) according to claim 5, wherein the rechargeable electrical element (40) comprises a first sheet (44) having a first longitudinal edge (46), a second longitudinal edge (48) opposite the first longitudinal edge (46), and a longitudinal strip-shaped portion (50) situated between the first edge longitudinal (46) and the second longitudinal edge (48), the first sheet (44) being rolled so that the first longitudinal edge (46) of the first sheet (44) coincides with the longitudinal strip-shaped portion (50) of the first sheet (44) along a first junction line (54) substantially parallel to the second central axis (B-B') to form the internal tubular wall (42) of the rechargeable electrical element (40), the rechargeable electrical element (40) further comprising at least one first fastening element (56) arranged to fix said first longitudinal edge (46) of the first sheet (44) on said longitudinal strip-shaped portion (50) of the first sheet (44) along the first junction line (54).

7. Assembly (10) according to claim 6, wherein the first fastening element (56) is a sealing strip extending substantially parallel to the second central axis (B-B') and welded to the first longitudinal edge (46) and the longitudinal strip-shaped portion (50) of the first sheet (44) along the first joining line (54).

8. Assembly (10) according to claim 6 or 7, wherein the first sheet (44) further comprises a drive portion (58) delimited between the second longitudinal edge (48) of the first sheet (44) and the longitudinal strip-shaped portion (50) of the first sheet (44), the drive portion (58) being able to extend radially towards the second central axis (B-B'), the inner tubular wall (42) of the rechargeable electrical element (40) being able to be driven in rotation about the second central axis (B-B') when the at least one second bundle (43) is wound on the inner tubular wall (42) of the rechargeable electrical element (40) by driving the drive portion (58).

9. Assembly (10) according to any one of claims 5 to 8, wherein the rechargeable electrical element (40) comprises an external tubular wall (62) extending around the second central axis (B-B') and around the internal tubular wall (42) of the rechargeable electrical element (40), the internal (42) and external (62) tubular walls of the rechargeable electrical element (40) radially delimiting an annular space (60) for receiving at least one second beam (43).

10. Assembly (10) according to claim 9, wherein the outer tubular wall (62) comprises an electrically insulating material.

11. Assembly (10) according to claim 9 or 10, wherein the outer tubular wall (62) is formed by a multilayer film comprising two layers of plastic material and a metallic layer, preferably aluminum, sandwiched between the two layers of plastic material.

12. Assembly (10) according to any one of claims 9 to 11, wherein the rechargeable electrical element (40) comprises a second sheet (64) wound so that two opposite longitudinal edges (66, 68) of the second sheet (64) coincide along a second junction line (74) substantially parallel to the second central axis (B-B') to form the outer tubular wall (62) of the rechargeable electrical element (40), the rechargeable electrical element (40) further comprising at least one second fastening element (76) arranged to fix together the two opposite longitudinal edges (66, 68) of the second sheet (64) along the second junction line (74).

13. Assembly (10) according to claim 12, wherein the second fixing element (76) is a sealing strip extending substantially parallel to the second central axis (B-B') and welded to the two opposite longitudinal edges (66, 68) of the second sheet (64) along the second joining line (74).

14. Assembly (10) according to any one of the preceding claims, wherein the rechargeable electrical element (40) is a capacitor, a hybrid capacitor or a second electrochemical element, in particular a secondary electrochemical element, for example of the lithium-ion or sodium-ion type.

15. Assembly (10) according to any one of the preceding claims, wherein the first electrochemical element (20) has an energy density greater than that of the rechargeable electrical element (40) and the rechargeable electrical element (40) has a power density greater than that of the first electrochemical element (20).

16. A method (100) for manufacturing an assembly (10) according to any one of the preceding claims, comprising the following steps: - supply (110) of the first electrochemical element (20); - spiral winding (130) of at least a second bundle (43) around the second central axis (B-B'); - arrangement (160) of the first electrochemical element (20) such that the second central axis (B-B') is coaxial with the first central axis (A-A') and that at least one second beam (43) is spirally wound around the external tubular wall (24) of the first electrochemical element (20).

17. Manufacturing method (100) according to claim 16, further comprising prior to the winding step (130), the production (120) of an internal tubular wall (42) of the rechargeable electrical element (40), at least a second bundle (43) being wound on the inner tubular wall (42) of the rechargeable electrical element (40) during the winding step (130).

18. Manufacturing method (100) according to claim 17, wherein the embodiment (120) of the internal tubular wall (42) of the rechargeable electrical element (40) comprises: - the rolling (121) of a first sheet (44) having a first longitudinal edge (46), a second longitudinal edge (48) opposite the first longitudinal edge (46) and a portion (50) in the form of a longitudinal strip located between the first longitudinal edge (46) and the second longitudinal edge (48), so as to make the first longitudinal edge (46) coincide with the portion (50) in the form of a longitudinal strip along a first junction line (54) parallel to the second central axis (B-B') to form the internal tubular wall (42) of the rechargeable electrical element (40); - the arrangement (122) of a first fastening element (56) so as to fix said first longitudinal edge (46) on said portion (50) in the form of a longitudinal strip along the first junction line (54); the winding step (130) comprising driving the internal tubular wall (42) of the rechargeable electrical element (40) in rotation about the second axis of rotation (B- B') by driving a drive portion (58) of the first sheet (44) extending radially towards the second central axis (B-B'), the drive portion (58) being delimited between the second longitudinal edge (48) of the first sheet (44) and the portion (50) in the form of a longitudinal strip, to wind at least a second bundle (43) on the internal tubular wall (42) of the rechargeable electrical element (40).

19. Manufacturing method (100) according to claim 17 or 18, further comprising after the winding step (130), the making (140) of an external tubular wall (62) of the rechargeable electrical element (40) such that at least a second beam (43) extends into an annular receiving space (60) radially delimited by the internal (42) and external (62) tubular walls of the rechargeable electrical element (40).

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