Assembly comprising an electrochemical element and a rechargeable electrical element and associated manufacturing process

Abstract

Assembly comprising an electrochemical element and a rechargeable electrical element and associated manufacturing process. The assembly (10) comprises: - an electrochemical element (20) comprising: - a container (22) extending along a first central axis (A-A'), having an external tubular wall (24) delimiting an internal volume (30) receiving a first electrochemical bundle (32); - a rechargeable electrical element (40) electrically connected to the electrochemical element (20). The rechargeable electrical element (40) is a pouch-type element comprising a second bundle (43) having a first electrode, a second electrode, and at least one separator, the second bundle (43) being spirally wound around a second central axis (B-B') coaxial to the first central axis (A-A') and around the external tubular wall (24) of the electrochemical element (20). Figure for the abbreviation: Figure 2

Description

Title of the invention: Assembly comprising an electrochemical element and a rechargeable electrical element and associated manufacturing method

[0001] The present invention relates to an assembly comprising:

[0002] - a first electrochemical element comprising:

[0003] - a container extending along a first central axis, the container comprising an external tubular wall extending around the first central axis and delimiting an internal volume; and

[0004] - a first electrochemical beam received in the internal volume;

[0005] - a rechargeable electrical element electrically connected to the first element electrochemical;

[0006] US 2015 / 303538 Al is known to designate 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 lithium-ion electrochemical element. The rechargeable electrical element is a capacitor.

[0007] In such an assembly, the rechargeable electrical element also has a prismatic shape and is arranged laterally with respect to the electrochemical element to form an assembly of general parallelepiped shape.

[0008] However, such an arrangement presents disadvantages when the electrochemical element is cylindrical. In particular, the arrangement of a rechargeable prismatic electrical element in combination with the cylindrical electrochemical element results in a significant bulk and a spatial geometry that complicates its integration into an electrical system, for example, a battery compartment.

[0009] One aim of the invention is then to propose an assembly comprising an electrochemical element and a rechargeable electrical element, whose size is reduced and whose geometry in space facilitates its integration into an electrical system.

[0010] To this end, the invention relates to an assembly of the aforementioned type in which the rechargeable electrical element is a pouch-type element comprising at least a second bundle having at least a first electrode of first polarity, at least a second electrode of second polarity opposite to the first polarity and at least a separator separating said at least a first electrode and said at least a second electrode,

[0011] at least a second beam being spirally wound 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 (also called a "pouch" in English) in a spiral around the second central axis coaxial with the first central axis and around the outer tubular wall of the electrochemical element makes it possible to obtain an assembly with a reduced footprint. The resulting assembly is also compact because it eliminates the need for a separate rechargeable electrical element.

[0013] Such a 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 features, 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, by example of the lithium-ion type or the sodium-ion type;

[0017] - the outer tubular wall of the first electrochemical element is cylindrical at circular or oblong straight section;

[0018] - the rechargeable electrical element comprises an internal tubular wall extending around the second central axis and around the outer tubular wall of the container of the first electrochemical element,

[0019] at least a second bundle being wound on the internal tubular wall of the rechargeable electrical element;

[0020] - 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 band-shaped portion situated between the first longitudinal edge and the second longitudinal edge, the first sheet being rolled up so that the first longitudinal edge of the first sheet coincides with the longitudinal band-shaped portion of the first sheet along a first junction line substantially parallel to the second central axis to form the internal tubular wall of the rechargeable electrical element,

[0021] the rechargeable electrical element further comprising at least a first fastening element arranged to fix said first longitudinal edge of the first sheet on said longitudinal strip-shaped portion of the first sheet along the first junction line;

[0022] - the first fixing 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 junction line;

[0023] - the first sheet further comprises a training portion delimited between the second longitudinal edge of the first leaf and the longitudinal strip-shaped portion of the first leaf,

[0024] the drive portion being capable of extending radially towards the second central axis,

[0025] 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 at least a second bundle on the internal tubular wall of the rechargeable electrical element by driving the drive portion;

[0026] - 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,

[0027] the internal and external tubular walls of the rechargeable electrical element radially delimiting an annular space for receiving at least a second beam;

[0028] - the outer tubular wall comprises an electrically insulating material;

[0029] - the outer tubular wall is formed by a multi-layered film comprising two layers of plastic material and a metallic layer, preferably made of aluminium, sandwiched between the two layers of plastic material;

[0030] - the rechargeable electrical element comprises a second rolled sheet of so that two opposite longitudinal edges of the second sheet coincide along a second junction line substantially parallel to the second central axis to form the outer tubular wall of the rechargeable electrical element,

[0031] the rechargeable electrical element further comprising at least one second fastening element arranged to fix together the two opposite longitudinal edges of the second sheet along the second junction line;

[0032] - the second fastening element is a sealing strip extending substantially parallel to the second central axis and welded on the two opposite longitudinal edges of the second sheet along the second junction line;

[0033] - 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 or sodium-ion type; and

[0034] - the first electrochemical element has an energy density greater than that of the rechargeable electrical element and the rechargeable electrical element has a higher power density than that of the first electrochemical element.

[0035] The invention also relates to a method for manufacturing an assembly as described above, comprising the following steps:

[0036] - supply of the first electrochemical element;

[0037] - spiral winding of at least a second bundle around the second axis central;

[0038] - arrangement of the first electrochemical element such that the second axis central is coaxial with the first central axis and that at least a second beam is spirally wound around the outer tubular wall of the first electrochemical element.

[0039] According to other advantageous aspects of the invention, the manufacturing process comprises one or more of the following features, taken individually or in all technically possible combinations:

[0040] - the process further comprises, prior to the winding step, the realization of an internal tubular wall of the rechargeable electrical element,

[0041] at least a second bundle being wound on the internal tubular wall of the rechargeable electrical element during the winding step;

[0042] - the realization of the internal tubular wall of the rechargeable electrical element understand :

[0043] - the rolling of a first sheet having a first longitudinal edge, a second longitudinal edge opposite the first longitudinal edge and a longitudinal band-shaped portion situated between the first longitudinal edge and the second longitudinal edge, so as to make the first longitudinal edge coincide with the longitudinal band-shaped portion along a first junction line parallel to the second central axis to form the internal tubular wall of the rechargeable electrical element;

[0044] - the arrangement of a first fastening element so as to fix said first edge longitudinal on said portion in the form of a longitudinal band along the first junction line;

[0045] the winding step comprising driving the internal tubular wall of the rechargeable electrical element in rotation around the second axis of rotation by driving a drive portion of the first sheet extending radially towards the second central axis, the drive portion being delimited between the second longitudinal edge of the first sheet and the longitudinal strip-shaped portion, to wind at least a second bundle onto the internal tubular wall of the rechargeable electrical element; and

[0046] - the process further comprises, after the winding step, the carrying out of a external tubular wall of the rechargeable electrical element such that at least one The second beam extends into an annular receiving space radially delimited by the internal and external tubular walls of the rechargeable electrical element.

[0047] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0048] [Fig-1] [Fig.1] is a simplified schematic representation of a view in perspective of an assembly according to the invention;

[0049] [Fig.2] [Fig.2] is a simplified schematic representation of a view in perspective of the whole of [Fig.1], exploded view;

[0050] [Fig. 3] [Fig. 3] is a simplified schematic representation of a cross-sectional view of the whole of [Fig.1], according to the section plane III-III;

[0051] [Fig. 4] [Fig. 4] is a simplified schematic representation of a cross-sectional view of the whole of [Fig.1], according to the section plane IV-IV;

[0052] [Fig.5] [Fig.5] is a simplified schematic representation of a view in perspective of the whole of [Fig.1], in which the first electrochemical element is omitted;

[0053] [Fig.6] [Fig.6] is a simplified schematic representation of the tubular wall internal of the rechargeable electrical element and of a first fixing element of the whole of the [Fig.l], according to a cutting plane substantially perpendicular to the second central axis;

[0054] [Fig.7] [Fig.7] is a simplified schematic representation of a process of manufacturing of the entire [Fig.1], according to the invention.

[0055] In what follows, unless otherwise indicated:

[0056] - the expressions "axial", "radial", "circumferentially" refer to the axis of the element in question;

[0057] - by "tubular" is meant the shape of a tube, that is to say the shape of a conduit to any straight section, open at one end or both;

[0058] - by "cylindrical" we mean the shape of a cylinder, that is to say, of a surface equal to the union of all parallel generators (parallel lines) intersecting a directrix (director curve);

[0059] - 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.

[0060] With reference to figures 1 to 6, an assembly 10 according to the invention is described.

[0061] Assembly 10 is adapted to supply electricity to an electrical device (not shown). Assembly 10 is autonomously manipulable. The constituent elements of assembly 10 do not separate from one another, at least not under the effect of gravity.

[0062] The set 10 comprises a first electrochemical element 20 and a rechargeable electrical element 40.

[0063] In a particular example, the assembly 10 further includes a power supply connection (not shown). The power supply connection comprises, for example, a first electrical terminal of the first polarity and a second electrical terminal of the 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 specifically intended to transmit electrical energy from the first electrochemical element 20 and / or the rechargeable electrical element 40 to the electrical device (not shown).

[0064] 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 or sodium-ion type.

[0065] The primary electrochemical element is a non-rechargeable electrochemical element, also referred to as a "battery", in particular an element of the type lithium-thionyl chloride (Li-SOCl2), lithium-manganese dioxide (Li-MnO2), lithium-sulfur dioxide (Li-SO2), lithium-carbon monofluoride (Li-CFx), lithium-sulfuryl chloride (Li-SO2Cl2), or mixtures of these components or any alkaline battery.

[0066] 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.

[0067] For example, the first electrochemical element 20 has an energy density 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 between 10 Wh / kg and 300 Wh / kg.

[0068] Advantageously, the energy density of the first electrochemical element 20 is greater than the energy density of the rechargeable electrical element 40.

[0069] For example, the first electrochemical element 20 has a power density between 1 W / kg and 500 W / kg, in particular between 25 W / kg and 100 W / kg, notably substantially equal to 50 W / kg. For example, the rechargeable electrical element 40 has a power density between 200 W / kg and 900 W / kg, in particular between 500 W / kg and 900 W / kg.

[0070] Advantageously, the power density of the first electrochemical element 20 is less than the power density of the rechargeable electrical element 40.

[0071] For example, as will be detailed below, the first electrochemical element 20 is fixed to the rechargeable electrical element 40 by gluing or by press fitting.

[0072] For example, the first electrochemical element 20 comprises a container 22 extending along a first central axis A-A'.

[0073] 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 end front walls 26, 28.

[0074] The external tubular wall 24 is, in particular, cylindrical. Advantageously, the corresponding cylinder is right-angled. Further advantageously, the directrix of the corresponding cylinder is closed. Further advantageously, the directrix of the corresponding cylinder is at least continuous and at least differentiable over its entire domain.

[0075] For example, the external tubular wall 24 has a neutral fiber coinciding with the first central axis A-A'.

[0076] 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).

[0077] According to an alternative not illustrated, the external 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 a square and a circle.

[0078] The external tubular wall 24 delimits, in particular with the two end front walls 26, 28, an internal volume 30.

[0079] The end front walls 26, 28 extend substantially perpendicularly with respect to the first central axis A-A'. These front 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.

[0080] With reference to [Fig.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.

[0081] With reference to figures 3 and 4, the first electrochemical element 20 comprises a first electrochemical beam 32 received in the inner volume 30.

[0082] For example, the first electrochemical beam 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.

[0083] 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 or sodium-ion type.

[0084] In the case of a capacitor or a hybrid capacitor, the rechargeable electrical element 40 has, for example, a capacitance between 8pF and 1000F.

[0085] The capacitor can be a "supercapacitor" or "electrochemical double-layer capacitor" (EDLC), or even an "ultracapacitor." A capacitor is a device that stores energy by accumulating ions on two electrodes that act as ion collectors when a potential difference is applied between them. Energy storage in a (super)capacitor is electrostatic in origin, and not electrochemical as in the case of batteries. 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 layered structure that inserts / disinserts lithium ions.

[0086] In the case where the rechargeable electrical element 40 is a secondary electrochemical element, it has a capacity between 0.1 Ah and 1 Ah.

[0087] 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 first polarity pole surface 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 second polarity pole surface of the first electrochemical element.

[0088] According to an unillustrated embodiment, 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 embodiment, the outer tubular wall 24 and the inner tubular wall 42 are at least partially formed from an electrically conductive material. In this unillustrated embodiment, compared to the embodiment described primarily with reference to the figures, the inner tubular wall 42 is, in particular, functionalized to make it conductive.

[0089] With reference to Figures 3 and 4, the rechargeable electrical element 40 is an element, in particular an electrochemical and / or electrostatic 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. Advantageously, when the rechargeable electrical element is an element The electrochemical rechargeable electrical element 40 further comprises an electrolyte in which at least one first electrode, at least one second electrode, and at least one separator are at least partially immersed. In particular, the electrolyte is contained within an annular space 60 for receiving the second beam 43.

[0090] With reference to figures 1 to 5, at least one second beam 43 is spirally wound around a second central axis B-B' coaxial with the first central axis A-A', particularly 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, at least one first electrode, at least one second electrode and at least one separator of at least one second beam 43 are spirally wound ("jelly roll").

[0091] In particular, at least a second bundle 43 is wound on the inner tubular wall 42 of the rechargeable electrical element 40, described in more detail below.

[0092] According to the example illustrated in Figures 1 to 5, in its spirally wound form, the at least one second bundle 43 extends along the second central axis B-B' between a first end 37 and a second end 38. With reference to [Fig. 3], the at least one second bundle 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 variant not shown, the length L2 is greater than or equal to the length L1. Again, in a variant not shown, the length L2 is substantially equal to the length L1.

[0093] Advantageously, with reference to figures 1 to 3 and 5, the rechargeable electrical element 40 comprises the first electrical terminal 41A and the second electrical terminal 41B of second polarity.

[0094] More 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.

[0095] Even more advantageously, the rechargeable electrical element 40 includes the annular space 60 for receiving at least a second beam 43.

[0096] Even more advantageously, the rechargeable electrical element 40 comprises at least a first fixing element 56 and at least a second fixing element 76.

[0097] The first electrical terminal 41A is electrically connected to at least one first-polarity electrode of at least one second beam 43. As illustrated in the example in Figures 1 to 5, the first electrical terminal 41A is a connecting tab. Also according to this example, the first electrical terminal 41A extends substantially parallel to the second central axis B-B' along a first direction Dl. Advantageously, the first electrical terminal 41A extends through an axial passage 82 of a first annular end assembly 80A from the annular space 60 receiving at least a second beam 43 to outside said annular space 60.

[0098] The second electrical terminal 41B is electrically connected to at least one second electrode of the second polarity of at least one second beam 43. As illustrated in the example in Figures 1 to 5, the second electrical terminal 41B is a connecting tab. Also according to this example, the second electrical terminal 41B 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 41B extends through an axial passage 82 of a second annular end assembly 80B from the annular receiving space 60 of at least one second beam 43 to outside said annular space 60.

[0099] 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.

[0100] Advantageously, the internal tubular wall 42 delimits the central volume 45 for receiving the first electrochemical element 20.

[0101] Advantageously, the inner tubular wall 42 is applied against the outer tubular wall 24 of the first electrochemical element 20, particularly when the first electrochemical element 20 is arranged in the central volume 45 (as illustrated in Figures 1, 3 and 4). In particular, when the first electrochemical element 20 is arranged in the central volume 45, the inner tubular wall 42 conforms to 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.

[0102] Advantageously, in the example where the first electrochemical element 20 is attached to the rechargeable electrical element 40 by bonding, the outer tubular wall 24 of the first electrochemical element 20 is bonded to the inner tubular wall 42 of the rechargeable electrical element 40. In the variant where the first electrochemical element 20 is attached to the rechargeable electrical element 40 by press fitting, the outer tubular wall 24 of the first electrochemical element 20 is held by clamping in the central volume 45 by the inner 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 outer tubular wall 24 of the first electrochemical element 20 and an inner tubular wall 42 of the rechargeable electrical element 40, the first electrochemical element 20 is attached to the electrical element rechargeable 40 by force mounting, which ensures optimal electrical contact between walls 24 and 42.

[0103] The internal tubular wall 42 is, in particular, cylindrical. Advantageously, the corresponding cylinder is right-angled. Further advantageously, the directrix of the corresponding cylinder is closed. Further advantageously, the directrix of the corresponding cylinder is at least continuous and at least differentiable over its entire domain.

[0104] For example, the internal tubular wall 42 has a neutral fiber coinciding with the second central axis B-B'.

[0105] 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).

[0106] In the unillustrated 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.

[0107] Advantageously, the shape of the cross-section of the inner tubular wall 42 and the shape of the cross-section of the outer tubular wall 24 are substantially identical, in particular so that when the first electrochemical element 20 is arranged in the central volume 45, the inner tubular wall 42 conforms to the shape of the outer tubular wall 24 of the first electrochemical element 20.

[0108] Advantageously, the inner 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 MΩ.

[0109] Advantageously, the inner tubular wall 42 is formed by a multilayer film comprising two insulating layers, for example of plastic material, and a metallic layer, preferably of aluminum, sandwiched between the two insulating layers. The multilayer film is, for example, an EL408PH™ film from DNP.

[0110] The internal tubular wall 42 is capable of being driven in rotation around the second central axis B-B' during a winding of at least a 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.

[0111] 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 band situated between the first edge longitudinal 46 and the second longitudinal edge 48. Portion 50 is notably at a certain distance from each of the first and second longitudinal edges 46, 48.

[0112] Advantageously, the first sheet 44 further includes the training portion 58.

[0113] As illustrated in the example of Figures 5 and 6, the first sheet 44 is rolled up so that the first longitudinal edge 46 coincides with the portion 50 along a first junction line 54 substantially parallel to the second central axis B-B' to form the internal tubular wall 42. In other words, the rolled portion of the first sheet 44, delimited by the first longitudinal edge 46 and the portion 50, forms the internal tubular wall 42.

[0114] Advantageously, the first sheet 44 is formed by the multi-layer film.

[0115] 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 junction line 54.

[0116] The at least 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 ensures the sealing of the internal tubular wall 42 with respect to the contents of the annular space 60.

[0117] The training portion 58 is notably delimited between the second longitudinal edge 48 of the first sheet 44 and the portion 50 of the first sheet 44.

[0118] 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 freed from the central receiving volume 45 delimited by the internal tubular wall 42.

[0119] Advantageously, the drive portion 58 is pressed against the inner tubular wall 42, in particular between the inner tubular wall 42 and the outer tubular wall 24 of the first electrochemical element 20, when the first electrochemical element 20 is arranged in the central volume 45.

[0120] With reference to [Fig.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 basic perimeter of the internal tubular wall 42 when the latter is a cylindrical wall with a circular cross-section.

[0121] With reference to figures 1 to 5, the external tubular wall 62 extends around the second central axis B-B' and around the internal tubular wall 42.

[0122] The external tubular wall 62 is, in particular, cylindrical. Advantageously, the corresponding cylinder is straight. Further advantageously, the director of the cylinder The corresponding cylinder is closed. Even more advantageously, the director of the corresponding cylinder is at least continuous and at least differentiable over its entire domain.

[0123] For example, the external tubular wall 62 has a neutral fiber coinciding with the second central axis B-B'.

[0124] 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).

[0125] In the unillustrated 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.

[0126] 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 at least a second beam 43.

[0127] Advantageously, as illustrated in figures 1 to 4, the external tubular wall 62 forms an external envelope 14 of the assembly 10.

[0128] Advantageously, the outer 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 MΩ. This characteristic simplifies the assembly 10 since it then makes it possible to avoid adding a dedicated insulating sheath around the rechargeable electrical element 40.

[0129] Advantageously, the outer tubular wall 62 is formed by a multilayer film comprising two insulating layers, for example of plastic material, and a metallic layer, preferably of aluminum, sandwiched between the two insulating layers. The multilayer film is, for example, an EL408PH™ film from DNP.

[0130] Advantageously, with reference to [Fig.1], the second leaf 64 comprises a first longitudinal edge 66 and a second longitudinal edge 68 opposite the first longitudinal edge 66.

[0131] The second sheet 64 is rolled up so that the first longitudinal edge 66 and the second longitudinal edge 68 coincide along a second junction line 74 substantially parallel to the second central axis B-B' to form the external tubular wall 62 of the rechargeable electrical element 40. In other words, the second rolled sheet 64 forms the external tubular wall 62.

[0132] Advantageously, the second sheet 64 is formed by the multi-layer film.

[0133] With reference to Figures 1 and 4, at least a second fixing element 76 is arranged so as to fix together the two opposite longitudinal edges 66, 68 of the second sheet 64 along the second junction line 74.

[0134] 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 ensures the sealing of the external tubular wall 62 with respect to the contents of the annular space 60.

[0135] With reference to figures 2 to 5, the end annular assemblies 80A, 80B axially delimit the annular space 60 for receiving at least a second beam 43.

[0136] According to the example illustrated in Figures 2 to 5, each annular end assembly 80A, 80B includes an axial passage 82 (Figures 3 to 5) through which extends the first electrical terminal 41A or the second electrical terminal 41B. 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.

[0137] In particular, the end annular assemblies 80A, 80B are fixed to the internal 42 and external 62 tube walls in a sealed manner, so as to prevent any leakage of a possible electrolyte contained in the annular space 60.

[0138] Advantageously, each end annular assembly 80A, 80B comprises at least one annular spacer 84.

[0139] At least one annular spacer 84 is mounted, in particular welded, on the internal tubular walls 42 and external tubular walls 62 respectively and extends between the internal tubular walls 42 and external tubular walls 62.

[0140] According to the example in figures 3 to 5, each annular spacer 84 includes an axial passage 86, for example an axial orifice, for the passage of an electrical terminal 41A,41B.

[0141] Advantageously, each end annular assembly 80A, 80B further comprises at least one spacer ring 90.

[0142] In particular, each spacer ring 90 is mounted on the corresponding annular spacer 84, between the internal tubular walls 42 and external tubular walls 62.

[0143] In particular, according to the example in Figures 3 to 5, each spacer ring 90 includes an axial passage 92, for example an axial groove, for the passage of an electrical terminal 41A, 41B. The axial passage 92 of each spacer ring 90 communicates in particular with the axial passage 86 of the corresponding annular spacer 84.

[0144] With reference to [Fig. 3], at least one spacer ring 90 ensures a certain thickness E of annular space 60, measured radially with respect to the second central axis B-B', between the inner tube wall 42 and the outer tube 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.

[0145] Advantageously, as illustrated in Figures 2 to 4, for each end annular assembly 80A, 80B, at least one spacer ring 90 is arranged axially closer to at least one second beam 43 than is at least one annular spacer 84.

[0146] Mounting each spacer ring 90 on the corresponding annular spacer 84 and welding the annular spacer 84 to the internal 42 and external 62 tubular walls ensures sealing with respect to the contents of the annular space 60 receiving at least a second bundle 43.

[0147] With reference to [Fig.7], a method 100 for manufacturing assembly 10, according to the invention, is described.

[0148] The process 100 includes a step 110 of supplying the first electrochemical element 20.

[0149] Advantageously, the method 100 then includes the realization 120 of an internal tubular wall 42 of the rechargeable electrical element 40.

[0150] Further advantageously, the embodiment 120 of the internal tubular wall 42 of the rechargeable electrical element 40 includes the bearing 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 internal tubular wall 42 of the rechargeable electrical element 40.

[0151] In particular, the embodiment 120 of the internal tubular wall 42 of the rechargeable electrical element 40 then includes 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.

[0152] The method 100 then includes a step 130 of spiral winding of at least a second bundle 43 around the second central axis B-B', in particular on the internal tubular wall 42 of the rechargeable electrical element 40.

[0153] Advantageously, the winding step 130 includes driving the inner tubular wall 42 of the rechargeable electrical element 40 in rotation about the second axis of rotation B-B' by driving the drive portion 58 of the first sheet 44 to wind at least a second bundle 43 on the inner tubular wall 42.

[0154] Even more advantageously, the method 100 further comprises, after the winding step 130, the realization 140 of the external tubular wall 62 of the rechargeable electrical element 40 so that at least a second beam 43 extends into the annular space 60 of reception of the second beam 43.

[0155] For example, embodiment 140 of the outer tubular wall 62 of the rechargeable electrical element 40 includes the bearing 141 of the second sheet 64, in particular around the second spirally wound beam 43, so as to make the two opposite longitudinal edges 66, 68 coincide along the second junction line 74 to form the outer tubular wall 62 of the rechargeable electrical element 40.

[0156] In particular, the embodiment 140 of the external tubular wall 62 of the rechargeable electrical element 40 then includes the arrangement 142 of the second fixing element 76 so as to fix together the two opposite longitudinal edges along the second junction line 74.

[0157] Advantageously, the method 100 then includes a step 150 of mounting the two annular end assemblies 80A, 80B, in particular axially on either side of at least a second beam 43.

[0158] In particular, step 150 includes the fixing 151 of the first end annular assembly 80A to the internal 42 and external 62 tubular walls and then the fixing 152 of the second end annular assembly 80B, in particular so that each electrical terminal 41A, 41B extends through the corresponding axial passage 82.

[0159] Advantageously, the process 100 further includes, between steps 151 and 152, a step of filling the annular space 60 of reception of at least a second beam 43 with an electrolyte.

[0160] The process 100 then includes 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 at least a second beam 43 is spirally wound around the external tubular wall 24 of the first electrochemical element 20.

[0161] According to an unillustrated variant, the first electrical terminal 41A and the second electrical terminal 41B of the rechargeable electrical element 40 both extend along the first direction DI or along the second direction D2. The first and second electrical terminals 41A, 41B then each extend respectively along two axial passages 82 of one or the other of the two end annular sets 80 from the annular space 60 receiving at least a second beam 43 to outside said annular space 60.

[0162] According to another variant not shown, the first electrical terminal 41A or the second electrical terminal 41B 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 longitudinal strip-shaped portion 50 of the first sheet 44, in particular parallel to the drive portion 58. According to this variant, said first electrical terminal 41A or second electrical terminal 41B is advantageously connected electrically 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

1. Demands 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 a second bundle (43) having at least a first electrode of first polarity, at least a second electrode of second polarity opposite to the first polarity and at least a separator separating said at least a first electrode and said at least a second electrode, at least a 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), the rechargeable electrical element (40) comprising an inner tubular wall (42) extending around the second central axis (B-B') and around the outer tubular wall (24) of the container (22) of the first electrochemical element (20), at least one second bundle (43) being wound around the inner tubular wall (42) of the rechargeable electrical element (40), the rechargeable electrical element (40) comprising 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 longitudinal edge (46) and the second longitudinal edge (48), the first sheet (44) being wound such 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), the first sheet (44) further comprising 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 internal tubular wall (42) of the rechargeable electrical element (40) being capable of being driven in rotation about the second central axis (B-B') during the winding of at least a second bundle (43) on the internal tubular wall (42) of the rechargeable electrical element (40) by driving the drive portion (58).

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 or 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 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).

6. Assembly (10) according to any one of the preceding claims, wherein the rechargeable electrical element (40) includes 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).

7. Assembly (10) according to claim 6, wherein the outer tubular wall (62) comprises an electrically insulating material.

8. Assembly (10) according to claim 6 or 7, wherein the outer tubular wall (62) is formed by a multi-layer film comprising two layers of plastic material and a metallic layer, preferably of aluminum, sandwiched between the two layers of plastic material.

9. Assembly (10) according to any one of claims 6 to 8, 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).

10. Assembly (10) according to claim 9, wherein the second fastening 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).

11. 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.

12. 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) exhibits a power density greater than that of the first electrochemical element (20).

13. Method (100) of manufacturing an assembly (10) according to any one of the preceding claims, comprising the following steps: - supplying (110) 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 wound spirally around the external tubular wall (24) of the first electrochemical element (20), the method further comprising prior to the winding step (130), the making (120) of an internal tubular wall (42) of the rechargeable electrical element (40), at least one second beam (43) being wound on the internal tubular wall (42) of the rechargeable electrical element (40) during the winding step (130),the realization (120) of the internal tubular wall (42) of the rechargeable electrical element (40) comprising: - the bearing (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 longitudinal strip-shaped portion (50) 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) onto said longitudinal strip-shaped portion (50) 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, drive of 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).

14. A manufacturing method (100) according to claim 13, 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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