Electrical storage device comprising cylindrical electrochemical cells

Abstract

The invention relates to an electrical storage device (1), configured to electrically power an external electrical appliance. The electrical storage device (1) comprises, a positive terminal and a negative terminal, cylindrical electrochemical cells (10) configured to be electrically connected in series and / or in parallel to each other, and a protection and regulation device (14). The cylindrical electrochemical cells (10) form several sub-assemblies (19) of cylindrical electrochemical cells (10) which are distributed along an extension axis (A) of the electrical storage device (1).The electrical storage device (1) further comprises at least one intermediate assembly device (12) which extends between two adjacent sub-assemblies (19) of cylindrical electrochemical cells (10) and which is configured to provide a mechanical connection between the cylindrical electrochemical cells (10) of the two respective sub-assemblies. Figure 1.

Description

Title of the invention: Electrical storage device comprising cylindrical electrochemical cells Technical field

[0001] The present invention relates to an electrical storage device, and in particular to an electrical storage device comprising a plurality of cylindrical electrochemical cells, also called accumulator batteries.

[0002] The invention finds a preferred, and non-limiting, application in the storage of electricity, in particular for vehicles using only or partially electric motors, but also in the field of energy storage from photovoltaic, hydraulic, thermal or wind sources, for example. State of the art

[0003] It is known from the prior art to assemble cylindrical electrochemical cells positioned next to each other and to connect them electrically by means of bus bars in order to produce an electrical storage device. The electrical storage device, also called a storage battery, generally comprises an external covering configured to protect the cylindrical electrochemical cells.

[0004] This type of device is particularly efficient because it allows an assembly of cylindrical electrochemical cells to be produced in series and / or in parallel depending on the desired electrical voltage and intensity, and thus to adapt to the needs of a user.

[0005] However, a first drawback of such a device lies in the assembly of the cylindrical electrochemical cells to each other which proves to be complex and tedious.

[0006] A second disadvantage of such a device lies in the manufacture of the external covering, the function of which is to ensure the integrity of the electrical storage device, but also to protect the cylindrical electrochemical cells and the bus bars against unexpected electrical contacts which could lead to short circuits. In addition, the shape of the external covering is conditioned by the size of the assembly of cylindrical electrochemical cells and results in the creation of a covering in the shape of a rectangular parallelepiped, which presents an obvious complexity of production. Summary of the invention

[0007] The technical problem underlying the invention therefore consists of providing an electrical storage device which is of simple, compact and economical structure, while allowing simple and secure assembly of cylindrical electrochemical cells and while allowing safe use of the electrical storage device whatever the conditions of use.

[0008] To this end, the present invention relates to an electrical storage device, such as a battery-type assembly for example, configured to electrically power an external electrical device, the electrical storage device comprising:

[0009] - a positive terminal and a negative terminal configured to be connected to the device external electrical;

[0010] - cylindrical electrochemical cells configured to be electrically connected electrically in series and / or in parallel with each other, the cylindrical electrochemical cells being connected to the positive terminal and to the negative terminal;

[0011] - a protection and regulation device, such as an electronic management card (also called BMS) for example, configured to protect the cylindrical electrochemical cells against possible overvoltage or undervoltage and to ensure voltage balancing between each cylindrical electrochemical cell or group of cylindrical electrochemical cells;

[0012] the electrical storage device comprises several sub-assemblies of cylindrical electrochemical cells which are axially offset from each other along an extension axis of the electrical storage device, and the electrical storage device further comprises at least one intermediate assembly device, such as a printed circuit board (also called PCB in English) for example, which extends between two adjacent sub-assemblies of cylindrical electrochemical cells and which is configured to mechanically connect the cylindrical electrochemical cells belonging to the two respective sub-assemblies.

[0013] Such a configuration makes it possible to obtain an electrical storage device which is compact and whose manufacture and assembly are facilitated. Advantageously, the presence of at least one intermediate assembly device makes it possible to ensure the rigidity of each of the subassemblies. The cylindrical electrochemical cells thus have the dual function of storing and restoring electrical energy, but also of forming the chassis of the storage device in collaboration with the at least one intermediate assembly device.

[0014] The electrical storage device may further have one or more of the following characteristics, which may be taken alone or in combination.

[0015] According to one embodiment of the invention, the at least one intermediate assembly device is configured to prevent displacement of the cylindrical electrochemical cells belonging to the two respective subassemblies, transversely to the extension axis.

[0016] According to one embodiment of the invention, the electrical storage device comprises several intermediate assembly devices.

[0017] According to one embodiment of the invention, the at least one intermediate assembly device comprises several conductive tracks, such as bus bars for example, each configured to electrically connect at least two cylindrical electrochemical cells of the same subassembly. Such a configuration of the intermediate assembly device makes it possible to connect in parallel certain cylindrical electrochemical cells present in the same subassembly. Advantageously, this makes it possible to increase the power delivered by the electrical storage device.

[0018] According to one embodiment of the invention, each conductive track is deposited on the first face and / or the second face of the intermediate assembly device.

[0019] According to one embodiment of the invention, the routing of the conductive tracks is identical for each of the intermediate assembly devices.

[0020] According to one embodiment of the invention, the electrical storage device further comprises a proximal assembly device and a distal assembly device each configured to be in contact with a single subset of cylindrical electrochemical cells, the proximal assembly device being configured to mechanically connect the cylindrical electrochemical cells belonging to the respective subset and the distal assembly device being configured to mechanically connect the cylindrical electrochemical cells belonging to the respective subset.

[0021] According to one embodiment of the invention, the proximal assembly device and the distal assembly device each comprise a plurality of conductive tracks.

[0022] According to one embodiment of the invention, each of the cylindrical electrochemical cells comprises a first electrode provided with a first attachment portion, and a second electrode provided with a second attachment portion which is complementary to the first attachment portion, the first attachment portion of a cylindrical electrochemical cell being configured to be attached to the second attachment portion of an adjacent cylindrical electrochemical cell.

[0023] According to one embodiment of the invention, each first attachment portion is a male attachment element, and each second attachment portion is a female attachment element configured to be mechanically attached with the male attachment element provided on an adjacent cylindrical electrochemical cell.

[0024] According to one embodiment of the invention, each male fastening element comprises a threaded portion configured to cooperate in a complementary manner with a tapped portion provided on the respective female fastening element.

[0025] According to one embodiment of the invention, the male-female fixing system is a screw / nut system.

[0026] According to one embodiment of the invention, each cylindrical electrochemical cell of a subassembly is aligned with a cylindrical electrochemical cell of each of the other subassemblies. Such a configuration of the invention makes it possible to obtain rows of cylindrical electrochemical cells which extend along the extension axis. Advantageously, this makes it possible to minimize the empty spaces inside the electrical storage device and thus to obtain the greatest possible energy density.

[0027] According to one embodiment of the invention, the subassemblies comprise a number of cylindrical electrochemical cells which is identical.

[0028] According to one embodiment of the invention, the cylindrical electrochemical cells are identical in terms of dimensions and power.

[0029] According to one embodiment of the invention, the at least one intermediate assembly device has a disc shape and extends substantially transversely to the extension axis.

[0030] According to one embodiment of the invention, the proximal assembly device and the distal assembly device each have a shape which is similar to that of the at least one intermediate assembly device and extend substantially transversely to the extension axis.

[0031] According to one embodiment of the invention, the proximal, distal and intermediate assembly devices extend substantially parallel to each other.

[0032] By substantially transversely to the extension axis is meant that the intermediate assembly device can extend perpendicular to the extension axis or be inclined relative to the latter by an angle of inclination of between 85 and 95°. Such a configuration of the intermediate assembly device makes it possible to minimize the surface area on which the cylindrical electrochemical cells are placed.

[0033] According to one embodiment of the invention, the intermediate assembly device comprises a plurality of orifices extending parallel to the extension axis, each orifice being configured to allow at least partial insertion of the first electrode or the second electrode of a respective cylindrical electrochemical cell.

[0034] According to one embodiment of the invention, each orifice is configured to prevent the passage of the first electrode or the second electrode of a respective cylindrical electrochemical cell. Such a configuration of the electrical storage device allows the installation of an intermediate assembly device between each subassembly. Advantageously, such a configuration allows, among other things, the intermediate assembly device to be clamped between an end face of a cylindrical electrochemical cell and an end portion of the first electrode or second electrode of a contiguous cylindrical electrochemical cell. In other words, each of the intermediate assembly devices is sandwiched between two respective subassemblies.

[0035] Advantageously again, the clamping of each of the intermediate assembly devices between the end face of a cylindrical electrochemical cell and the end portion of the first electrode or the second electrode of a contiguous cylindrical electrochemical cell makes it possible to ensure efficient and seamless electrical contact between the first and second electrodes and the bus bars connecting several cylindrical electrochemical cells of the same subassembly.

[0036] Such a configuration of the invention makes it possible, during the assembly of the subassemblies, to mechanically clamp each of the intermediate assembly devices provided between two stages of cylindrical electrochemical cells. Advantageously, this makes it possible, among other things, to create an electrical storage device whose cylindrical electrochemical cells behave as an inseparable assembly. This makes it possible, for example, to make the electrical storage device resistant to shocks and vibrations which may occur during its use.

[0037] According to one embodiment of the invention, each intermediate assembly device is electrically connected, by an electric wire for example, to the protection and regulation device.

[0038] According to one embodiment of the invention, the electrical storage device further comprises a housing extending along the extension axis and configured to house the subassemblies of cylindrical electrochemical cells, the at least one intermediate assembly device, and the protection and regulation device.

[0039] According to one embodiment of the invention, the housing comprises a tubular body provided with a first end portion and a second end portion opposite the first end portion, a first closing device configured to close the first end portion, and a second closing device configured to close the second end portion, the positive terminal and the negative terminal being configured to be accessible from outside the housing, for example respectively at the first closing device and the second closing device.

[0040] According to one embodiment of the invention, the positive terminal and the negative terminal are provided on a power connector of the XT90 type for example.

[0041] According to one embodiment of the invention, the electrical storage device further comprises a discharge device, such as a ventilation valve for example, configured to ensure stable pressure inside the housing.

[0042] According to one embodiment of the invention, the discharge device is a ventilation valve conforming to the IP67 standard. Such a configuration of the invention allows advantageously a safe use of the electrical storage device while minimizing the risk of water or humidity infiltration inside the housing.

[0043] According to one embodiment of the invention, each of the first and second closure devices comprises a sealing device, such as an O-ring for example.

[0044] According to one embodiment of the invention, the first sealing device comprises a first fixing plate configured to seal the first end portion, and a first fixing support fixed to the first fixing plate and on which the respective sealing device is fixed. Advantageously, the first fixing support is annular and extends at least partly inside the housing.

[0045] According to one embodiment of the invention, the first fixing plate is configured to be pressed against a first end face of the housing.

[0046] According to one embodiment of the invention, the second sealing device comprises a second fixing plate configured to close the second end portion, and a second fixing support fixed to the second fixing plate and on which the respective sealing device is fixed. Advantageously, the second fixing support is annular and extends at least partly inside the housing.

[0047] According to one embodiment of the invention, the second fixing plate is configured to be pressed against a second end face of the housing.

[0048] According to one embodiment of the invention, each sealing device is configured to cooperate with a groove provided on the periphery of the respective fixing support.

[0049] According to one embodiment of the invention, the first fixing plate and the first fixing support are fixed to each other by screwing.

[0050] According to one embodiment of the invention, the second fixing plate and the second fixing support are fixed to each other by screwing.

[0051] According to one embodiment of the invention, the electrical storage device further comprises a plurality of reinforcing members, such as reinforcing rods, configured to extend at least between the proximal assembly device and the distal assembly device. Such a configuration of the invention advantageously makes it possible to reduce the mechanical stresses that the cylindrical electrochemical cells undergo during the installation and tightening of the first and second closure devices. Indeed, the reinforcing members are configured to absorb the tensile forces resulting from the tightening of the fixing means.

[0052] According to one embodiment of the invention, each reinforcing member is elongated and extends substantially parallel to the extension axis.

[0053] According to one embodiment of the invention, each reinforcing member is made of polyoxymethylene for example.

[0054] According to one embodiment of the invention, each reinforcing member is configured to pass right through the at least one intermediate assembly device.

[0055] According to one embodiment of the invention, the housing has a cross-section of substantially circular shape.

[0056] According to one embodiment of the invention, the clearance between an internal wall of the housing and a periphery of the intermediate assembly device is between 10 μm and 100 μm, advantageously between 30 μm and 70 μm and is for example 50 μm. Such a configuration of the housing and the intermediate assembly device makes it possible to ensure assembly and use without movement of the cylindrical electrochemical cells inside the housing. Advantageously, this makes it possible to avoid the generation of vibration and mechanical stress between the cylindrical electrochemical cells and the housing, the vibrations being able to cause irreversible damage to the components. Brief description of the figures

[0057] The present invention will be better understood with the aid of the following description with reference to the appended figures, in which identical reference signs correspond to structurally and / or functionally identical or similar elements.

[0058] [Fig-1] is a partial side perspective view of a storage device electric according to a first embodiment of the invention;

[0059] [Fig.2] is a front perspective view of a subset of electro cells cylindrical chemicals belonging to the electrical storage device of [Fig.l];

[0060] [Fig.3] is a truncated perspective view of the electrical storage device according to the present invention;

[0061] [Fig.4] is a partial longitudinal sectional view of the storage device electrical [Fig.l] which represents the first and second fixing parts of contiguous cylindrical electrochemical cells;

[0062] [Fig.5] is a side perspective view of a proximal assembly device, of a distal assembly device and a plurality of intermediate assembly devices belonging to the electrical storage device of [Fig.l];

[0063] [Fig.6] is a perspective view of a cylindrical electrochemical cell ap belonging to the electrical storage device of [Fig.l];

[0064] [Fig.7] is a perspective view of the electrical storage device of [Fig.l];

[0065] [Fig.8] is a longitudinal sectional view of the electrical storage device of the [Fig.l];

[0066] [Fig.9] is a partial perspective view of the electrical storage device according to a second embodiment of the invention. Detailed description

[0067] Figures 1 to 8 represent all or part of an electrical storage device 1, according to a first embodiment of the invention, configured to electrically supply an external electrical device, such as an electric vehicle for example.

[0068] The electrical storage device 1 comprises a housing 2 of substantially cylindrical cross-section and which extends along an extension axis A. The housing 2 comprises a tubular body provided with a first end portion 3, a first closure device 4 configured to close the first end portion 3, a second end portion 5 opposite the first end portion, and a second closure device 6 configured to close the second end portion 5. Each of the first closure device 4 and second closure device 6 comprises a sealing device 7, such as an O-ring for example.The sealing device 7 is advantageously configured to prevent fluid communication between the inside and the outside of the electrical storage device 1 when the first end 3 and the second end 5 of the housing 2 are respectively closed by the first closing device 4 and the second closing device 6. In order to facilitate implementation and manufacturing, the first and second closing devices 4, 6 may each comprise a threaded part or a tapped part configured to cooperate respectively with a complementary tapped part or a complementary threaded part provided on the side of the first end portion 3 and the second end portion 5.

[0069] The first sealing device 4 comprises a first fixing plate 4.1 configured to seal the first end portion 3, and a first fixing support 4.2 fixed to the first fixing plate 4.1 and on which the respective sealing device 7 is fixed.

[0070] The second sealing device 6 comprises a second fixing plate 6.1 configured to close the second end portion 5, and a second fixing support 6.2 fixed to the second fixing plate 6.1 and on which the respective sealing device 7 is fixed. Each of the sealing devices 7 is configured to cooperate with a groove provided on the periphery of the first fixing support 4.2 and the second fixing support 6.2.

[0071] Advantageously, the first fixing support 4.2 and the second fixing support 6.2 are annular and each extend at least partly inside the housing 2. The first fixing plate 4.1 and the second fixing plate 6.1 are configured to be pressed respectively against a first end face and a second end face of the housing 2. Advantageously, the first and second fixing plates 4.1, 6.1 are respectively fixed by screwing with and the first and second fixing supports 4.2, 6.2.

[0072] The electrical storage device 1 further comprises a positive terminal 8 and a negative terminal 9 provided at the first sealing device 4, the positive terminal 8 and the negative terminal 9 being configured to be connected to the external electrical device. The positive terminal 8 and the negative terminal 9 may be provided on an AC power connector of the XT90 type for example.

[0073] The electrical storage device 1 further comprises cylindrical electrochemical cells 10, a proximal assembly device 11, intermediate assembly devices 12, a distal assembly device 13, as well as a protection and regulation device 14 which are all housed in the housing 2.

[0074] The cylindrical electrochemical cells 10 are configured to be electrically connected in series and / or in parallel to each other, between the positive terminal 8 and the negative terminal 9 of the electrical storage device 1. Advantageously, the cylindrical electrochemical cells 10 have technical characteristics which are identical in terms of dimensions and power for example.

[0075] The cylindrical electrochemical cells 10 each comprise a first electrode 15, for example a positive electrode, provided with a first fixing part 16, and a second electrode 17, for example a negative electrode, provided with a second fixing part 18 which is complementary to the first fixing part 16. The first electrode 15 of a cylindrical electrochemical cell 10 is advantageously configured to be fixed to the second electrode 17 of an adjoining cylindrical electrochemical cell 10.

[0076] According to the embodiment of the invention, and as seen more particularly in [Fig. 4], the first fixing part 16 is a male fixing element configured to be mechanically fixed with a female fixing element provided on the second fixing part 18 of a contiguous cylindrical electrochemical cell 10. More specifically, the male fixing element comprises a threaded portion which is configured to cooperate by form complementarity with a tapped portion provided on the female fixing element in order to form a male female system of the screw / nut type.

[0077] The electrical storage device 1 comprises several sub-assemblies 19 of cylindrical electrochemical cells 10 distributed along the extension axis A, i.e. axially offset along the extension axis. Each sub-assembly comprises a number of cylindrical electrochemical cells 10 which is identical. Furthermore, each cylindrical electrochemical cell 10 of the same sub-assembly 19 is aligned with a cylindrical electrochemical cell 10 of each of the other sub-assemblies 19. Such a configuration of the invention makes it possible to obtain rows of cylindrical electrochemical cells 10 which extend parallel to the extension axis A. Advantageously, this makes it possible to minimize the empty spaces inside the electrical storage device 1 and thus to obtain the greatest possible energy density.

[0078] The intermediate assembly devices 12 have a disc shape and extend transversely to the extension axis A. Advantageously, each intermediate assembly device is formed by a printed circuit board and extends coaxially to the extension axis A. The intermediate assembly devices 12 are each provided to extend between two adjacent sub-assemblies 19 of cylindrical electrochemical cells 10. The intermediate assembly devices 12 are further configured to provide a mechanical connection between each cylindrical electrochemical cell 10 of the same sub-assembly 19 adjacent to said sub-assembly.

[0079] Each intermediate assembly device 12 comprises orifices 20 extending parallel to the extension axis A and configured to allow the insertion of the first electrode 15 of each of the cylindrical electrochemical cells 10 belonging to one of the two respective sub-assemblies and to prevent the insertion of the second electrode 17 of each of the cylindrical electrochemical cells 10 belonging to the other of the two respective sub-assemblies.

[0080] The intermediate assembly devices 12 are identical to each other in order to allow in particular the alignment of the cylindrical electrochemical cells 10 parallel to the extension axis A. Advantageously, such a configuration makes it possible to clamp the intermediate assembly device 12 between an end face 21 provided on the side of the first electrode 15 of a cylindrical electrochemical cell 10 and an end portion 22 of the second electrode 17 of a contiguous cylindrical electrochemical cell 10. In other words, each of the intermediate assembly devices 12 is clamped between the two respective sub-assemblies 19 during the assembly of the electrical storage device 1.Such a configuration of the invention makes it possible, during the assembly of the subassemblies 19, to mechanically clamp each of the intermediate assembly devices 12 provided between two subassemblies 19 of cylindrical electrochemical cells 10. Advantageously, this makes it possible, among other things, to create an electrical storage device 1 whose cylindrical electrochemical cells 10 behave as an inseparable assembly. This makes it possible, for example, to make the electrical storage device 1 resistant to shocks and vibrations which may occur during its use.

[0081] The intermediate assembly devices 12 further comprise conductive tracks 23, such as bus bars for example, each configured to electrically connect at least two cylindrical electrochemical cells 10 of a same subassembly. The conductive tracks 23 are for example formed by a conductive track deposited on the first face 24 and / or the second face 25 of each of the intermediate assembly devices 12. The conductive tracks 23 extend between, but also around, the orifices 20 which they connect. Such a configuration of the intermediate assembly devices 12 makes it possible to connect in parallel certain cylindrical electrochemical cells 10 belonging to the same subassembly 19 and thus to increase the amperage delivered by the electrical storage device 1 independently of the individual power of the cylindrical electrochemical cells 10 used. Advantageously, the routing of the conductive tracks 23 is identical for each intermediate assembly device 12.

[0082] Advantageously, the clamping of each of the intermediate assembly devices 12 between the end face 21 of a cylindrical electrochemical cell 10 and the end portion 22 of the second electrode 17 of a contiguous cylindrical electrochemical cell 10 makes it possible to ensure efficient and seamless electrical contact between the conductive tracks 23 and the first and second electrodes 15, 17 which connect the cylindrical electrochemical cells 10 of the same subassembly 19.

[0083] Unlike the intermediate assembly devices 12, the proximal assembly device 11 and the distal assembly device 13 are each configured to be in contact with a single respective subset 19 of cylindrical electrochemical cells 10. The proximal assembly device 11 and the distal assembly device 13 each have a disc shape that is similar to those of the intermediate assembly devices 12 and extend transversely to the extension axis A. The proximal assembly device 11 and the distal assembly device 13 also comprise conductive tracks 23 configured to electrically connect certain cylindrical electrochemical cells 10.According to the embodiment of the invention shown in the figures, the conductive tracks 23 present on the proximal assembly device 11, the distal assembly device 13 and on the intermediate assembly devices 12 are configured so that the electric current connecting the positive terminal 8 and the negative terminal 9 of the electrical storage device 1 makes two round trips along the extension axis A.

[0084] According to one embodiment of the invention, an operating clearance is provided between an inner wall 26 of the housing 2 and each of the intermediate assembly devices 12, the proximal assembly device 11 and the distal assembly device 13. The operating clearance is between 10 pm and 100 pm, advantageously between 30 pm and 70 pm and is for example 50 pm. Such a configuration makes it possible to ensure simple assembly of the electrical storage device 1 while preventing excessive movement of the cylindrical electrochemical cells 10 inside the housing 2. Advantageously, this makes it possible to avoid the generation of vibration and stress. mechanical between the subassemblies 19 and the housing 2, the vibrations being able to cause irreversible damage to the components of the electrical storage device 1.

[0085] The protection and regulation device 14 may be an electronic management card (also called BMS in English) for example. The protection and regulation device 14 is configured to protect the cylindrical electrochemical cells 10 against a possible overvoltage or undervoltage as well as to ensure balancing of the voltages between each cylindrical electrochemical cell 10 or group of cylindrical electrochemical cells 10. Each of the intermediate assembly devices 12, the proximal assembly device 11 and the distal assembly device 13 is electrically connected, by an electric wire for example, to the protection and regulation device 14.

[0086] The implementation of the invention makes it possible to obtain an electrical storage device 1 which is compact and whose manufacture and assembly are facilitated. Advantageously, the presence of the intermediate assembly devices 12, the proximal assembly device 11 and the distal assembly device 13 makes it possible to ensure the rigidity of each of the subassemblies 19. The cylindrical electrochemical cells 10 thus have the dual function of storing and restoring electrical energy, but also of forming the structural frame of the electrical storage device 1 in collaboration with the proximal assembly device 11, the intermediate assembly devices 12 and the distal assembly device 13.

[0087] The electrical storage device 1 further comprises a discharge device 27, visible more particularly in [Fig.7], and configured to ensure a stable pressure inside the housing 2. The discharge device 27 may be a ventilation valve conforming to the IP67 standard for example. Such a configuration of the invention advantageously allows safe use of the electrical storage device 1 while minimizing the risk of infiltration of water or humidity inside the housing 2.

[0088] [Fig. 9] represents an electrical storage device 1 according to a second embodiment of the invention. The second embodiment of the invention differs from the first embodiment essentially in that the electrical storage device 1 further comprises a plurality of reinforcing members 28, such as reinforcing rods. The reinforcing members 28 are configured to extend between the proximal assembly device 11 and the distal assembly device 13, and to pass right through the intermediate assembly devices 12. Each reinforcing member 28 is elongated and extends substantially parallel to the extension axis A. Such a configuration of the invention advantageously makes it possible to reduce the mechanical stresses to which the cylindrical electrochemical cells 10 are subjected during the installation and tightening of the first and second closure devices 4, 6. Indeed, the reinforcing members 28 are configured to absorb the tensile forces resulting from the screwing of the first fixing plate 4.1 onto the first fixing support 4.2 and of the second fixing plate 6.1 onto the second fixing support 6.2.

[0089] Of course, the present invention is in no way limited to the embodiments described and illustrated which have been given only as examples. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

1. Claims Electrical storage device (1), configured to electrically power an external electrical device, the electrical storage device (1) comprising: - a positive terminal (8) and a negative terminal (9) configured to be connected to the external electrical device; - cylindrical electrochemical cells (10) configured to be electrically connected in series and / or in parallel to each other, the cylindrical electrochemical cells (10) being connected to the positive terminal (8) and to the negative terminal (9); - a protection and regulation device (14), configured to protect the cylindrical electrochemical cells (10) against a possible overvoltage or undervoltage and to ensure balancing of the voltages between each cylindrical electrochemical cell (10) or group of cylindrical electrochemical cells (10); characterized in that the electrical storage device (1) comprises several sub-assemblies (19) of cylindrical electrochemical cells (10) which are axially offset from each other along an extension axis (A) of the electrical storage device (1), and in that the electrical storage device (1) further comprises at least one intermediate assembly device (12) which extends between two adjacent sub-assemblies (19) of cylindrical electrochemical cells (10) and which is configured to mechanically connect the cylindrical electrochemical cells (10) belonging to the two respective sub-assemblies, and in that each of the cylindrical electrochemical cells (10) comprises a first electrode (15) provided with a first fixing portion (16) and a second electrode (17) provided with a second fixing portion (18) which is complementary to the first fixing portion (16), the first fixing portion (16) of a cylindrical electrochemical cell (10) being configured to be fixed to the second fixing portion (18) of an adjoining cylindrical electrochemical cell (10).

2. Electrical storage device (1) according to claim 1, wherein the at least one intermediate assembly device (12) comprises several conductive tracks (23) each configured to electrically connect at least two cylindrical electrochemical cells (10) of the same subassembly.

3. An electrical storage device (1) according to claim 1 or claim 2, which further comprises a proximal assembly device (11) and a distal assembly device (13) each configured to be in contact with a single respective subset (19) of cylindrical electrochemical cells (10), the proximal assembly device (11) being configured to mechanically connect the cylindrical electrochemical cells (10) belonging to the respective subset and the distal assembly device (13) being configured to mechanically connect the cylindrical electrochemical cells (10) belonging to the respective subset.

4. Electric storage device (1) according to any one of claims 1 to 3, wherein the intermediate assembly device (12) comprises a plurality of orifices (20) extending parallel to the extension axis (A), each orifice (20) being configured to allow the at least partial insertion of the first electrode (15) or of the second electrode (17) of a respective cylindrical electrochemical cell (10).

5. Electric storage device (1) according to claim 4, wherein each orifice (20) is configured to prevent the passage of the first electrode (15) or of the second electrode (17) of a respective cylindrical electrochemical cell (10).

6. An electrical storage device (1) according to any one of claims 1 to 5, wherein each cylindrical electrochemical cell (10) of a subassembly (19) is aligned with a cylindrical electrochemical cell (10) of each of the other subassemblies.

7. Electrical storage device (1) according to any one of claims 1 to 6, wherein the at least one intermediate assembly device (12) has a disc shape and extends substantially transversely to the extension axis (A).

8. Electrical storage device (1) according to any one of claims 1 to 7, wherein the at least one intermediate assembly device (12) is electrically connected to the protection and regulation device (14).

9. Electrical storage device (1) according to any one of the preceding claims, which further comprises a housing (2) extending along the extension axis (A) and configured to house each of the sub-assemblies (19) of cylindrical electrochemical cells, the at least one intermediate assembly device (12), and the protection and regulation device (14).

10. Electrical storage device (1) according to the preceding claim, wherein the housing (2) comprises a tubular body provided with a first end portion (3) and a second end portion (5) opposite the first end portion (3), a first closing device (4) configured to close the first end portion (3) and a second closing device configured to close the second end (5), the positive terminal (8) and the negative terminal (9) being configured to be accessible from outside the housing (2).

11. An electrical storage device (1) according to claim 9 or claim 10, wherein the housing (2) has a substantially circular cross-section.

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