ELECTROCHEMICAL ENERGY STORAGE ELEMENT AND POWER BATTERY CONTAINING ELECTRICAL CONNECTION ELEMENTS

Abstract

The present invention relates to an electrochemical energy storage element (1) for a battery comprising two electrodes and a rigid casing (2) forming a prismatic body including walls (3, 4, 5) enclosing the two electrodes, having at least one polarity terminal (7) positioned in a corner of the body adapted for the electrical connection of the storage element (1). Said polarity terminal (7) is positioned on a wall (3) of the body having a concave surface profile in the form of a circular arc, creating a recess in the surface of the prismatic body intended for the insertion and rotation of a removable electrical linking element. Said polarity terminal (7) includes a rigid electrical linking member (6) projecting from the wall (3) and electrically connected to one of the two electrodes. The invention finds application for batteries, in particular for electrified vehicles. Figure 1.

Description

Title of the invention: ELECTROCHEMICAL ENERGY STORAGE ELEMENT AND POWER BATTERY COMPRISING ELECTRICAL CONNECTION ELEMENTS

[0001] The field of the invention relates to an electrochemical energy storage element for a battery, in particular for an electrified vehicle, and a battery.

[0002] Power battery systems comprise electrochemical energy storage elements, also called electrochemical cells, connected in series and / or parallel in the system. In order to optimize the energy density of a battery, manufacturers are looking for compact configurations in which the electrochemical elements can be arranged in alignment and / or stacked. It is common for these batteries to comprise several hundred electrochemical elements electrically interconnected by electrical connections, the most common being of the screwed type by means of rigid busbars made of aluminum and copper material.

[0003] For these stacked configurations, the electrical connections comprise vertical and horizontal connection elements, vertically to connect one electrochemical element to another on a different level and, horizontally, to connect to another on the same level. The quantity of connections required for a high-power battery is therefore very large, which increases the internal volume of a battery and complicates the assembly process. Furthermore, the multitude of connections increases the risk of an electrical fault occurring for high-power batteries, for example electric arcs that can be caused by a poorly fixed connection.

[0004] The state of the art discloses patent document FR-A1-3123159 describing an electrochemical battery element whose polarity terminals are located entirely within this shape, both in a corner. The objective of this solution is to optimize the energy density of a battery, to make manufacturing easy and economical and to have operational safety. Document EP-A1-4156395 describes a battery comprising prismatic cells, each having four rounded lateral corners allowing for a hollow-shaped fixing means to be provided which positions and maintains the cells in the module housing. Document US2016-A1-0351862 describes a set of prismatic cells, each having a recess on the four lateral corners, these recesses allowing the installation of a coupling element for a group of cells.Document CN-A-115332696 describes a solution aimed at optimizing the energy density of a battery and proposes a prismatic cell having a lateral recess allowing a conductive element to be housed in order to connect elec- . strictly a terminal to the envelope.

[0005] There is therefore a need to optimize the energy density of a battery, in particular to reduce the space between the storage elements occupied by the electrical connections. One objective of the invention is to propose a configuration reducing the internal space required for the assembly of a battery. Another objective is to facilitate the integration of the electrical connections and the electrochemical energy storage elements. Another objective is to propose a modular battery architecture for different motor powers of an electrified vehicle. Another objective of the invention is to propose a battery architecture having reinforced safety electrical connections.

[0006] More specifically, the invention relates to an electrochemical energy storage element for a battery comprising two electrodes and a rigid casing forming a prismatic body comprising walls enclosing the two electrodes. According to the invention, the electrochemical storage element comprises at least one polarity terminal positioned in a corner of the body adapted for the electrical connection of the storage element, said polarity terminal is positioned on a wall of the body having a concave surface profile in an arc of a circle forming a recess in the surface of the prismatic body intended for the insertion and rotation of a removable electrical connection element, and said polarity terminal comprises a rigid electrical connection member arranged projecting from the wall and electrically connected to one of the two electrodes.

[0007] According to a variant, the electrical connection member extends in a curved manner opposite said concave wall in an arc of a circle, the electrical connection member being adapted to be configured in a locked position and in an unlocked position by the rotation of said electrical connection element.

[0008] According to a variant, the electrochemical element comprises a plurality of polarity terminals distributed on corners of the prismatic body.

[0009] The invention provides a battery comprising a set of electrochemical energy storage elements arranged in a block and removable electrical connection elements having a cylindrical body for the electrical connection of the polarity terminals of all of said storage elements, in which each storage element is according to any one of the preceding embodiments, the walls of the polarity terminals of adjacent storage elements of the block have the concave surface profiles in an arc of a circle arranged opposite so as to form tubular cavities adapted to the insertion and rotation of the electrical connection elements, and the storage elements are electrically interconnected via said electrical connection elements by contact of the electrical connection members of each storage element with conductive parts on the lateral surface of the connection elements electric.

[0010] According to a variant, the connecting elements each comprise notches extending longitudinally on the lateral surface of the cylindrical body arranged so as to receive the electrical connecting members of the storage elements when the connecting elements are inserted into the tubular cavities, said notches of the connecting elements and the electrical connecting members being adapted to cooperate mechanically in rotation so as to configure the electrical connecting members and the connecting elements in a locked position and in an unlocked position.

[0011] According to a variant, each connecting element comprises on the lateral surface at least a first notch whose internal cavity comprises the electrically conductive part and a second electrically insulating notch, the first notch being adapted to ensure the mechanical and electrical connection in the locked position between two adjacent storage elements, the second notch being adapted to ensure the mechanical connection, only, in the locked position between two adjacent storage elements.

[0012] According to a variant, the electrical connection elements further comprise on the outer surface of the cylindrical body a convex conductive part and the connection members of the polarity terminals further comprise a conductive surface positioned on the concave wall of the terminal, said conductive surface area being electrically connected to one of the two electrodes, said conductive part of the connection element and said conductive surface of the terminal being electrically connected in the locked position.

[0013] According to a variant, the connecting members of the polarity terminals comprise a recess and the connecting elements a lip, said recess and said lip being arranged to cooperate in abutment in the locking position.

[0014] According to a variant, the storage elements are arranged in at least two rows on at least two levels and in which first connecting elements electrically interconnect two storage elements of the same row and second connecting elements electrically interconnect two storage elements from one level to the other.

[0015] The invention further provides an electrified vehicle comprising a traction battery according to any one of the preceding embodiments.

[0016] The invention proposes an innovative battery architecture using a modular electrochemical element and a cylindrical electrical connecting element facilitating the assembly of the battery and improving electrical safety. It makes it possible to make an electrical connection between two electrochemical elements by inserting and rotating a single connecting element. The connecting element also makes it possible to mechanically stiffen a block of several electrochemical elements.

[0017] Other characteristics and advantages of the present invention will appear more clearly on reading the detailed description which follows, comprising embodiments of the invention given as non-limiting examples and illustrated by the appended drawings, in which:

[0018] [Fig.l] schematically represents an electrochemical energy storage element according to the invention.

[0019] [Fig.2] schematically represents a modular battery comprising a set storage element according to the invention.

[0020] [Fig.3] schematically represents a removable electrical connection element for battery according to the invention.

[0021] [Fig.4] schematically represents an electrical connection element and a terminal of polarity according to the invention in an unlocked position and a locked position.

[0022] [Fig.5A] represents a first electrical connection configuration of a connecting element between two storage elements positioned on the same level.

[0023] [Fig.5B] represents a second electrical connection configuration of a connecting element between two storage elements positioned on two floors.

[0024] [Fig.6A] illustrates a first configuration of electrical connection of a battery between storage elements belonging to two different stages.

[0025] [Fig.6B] represents a second configuration of electrical connection of a battery between storage elements of the same stage.

[0026] [Fig.7] represents an alternative embodiment of a connecting element and of the member connecting the storage element according to the invention comprising a locking stop.

[0027] [Fig.8] represents an alternative embodiment of a connecting element and of the member connecting the storage element according to the invention comprising conductive parts on the outer surface.

[0028] The invention applies to electrochemical energy storage elements for batteries, in particular in the field of electrified vehicles, i.e. vehicles comprising an electric motor machine and power electronics, with fully electric or hybrid motorization, preferably motor vehicles, but not only such as aircraft, tractors, bicycles, ships. More generally, the invention also applies to stationary systems such as renewable energy installations, as well as to any autonomous electrical system such as drones, robots or portable devices, computers, tablets, mobile phones, consoles, cameras, scanners, which are cited as a non-exhaustive list of application examples.

[0029] The invention aims to facilitate the electrical connection configuration of power systems, to reduce energy density, and to propose a modular architecture. simplified assembly and improved safety.

[0030] An electrochemical energy storage element, also called an electrochemical cell, is a storage element having two electrical connection terminals and having a voltage of a few volts, most often between 2.3V and 4.2V, approximately. The cells can be of the Lithium-ion type (a lithium Nickel Manganese Cobalt oxide NMC or a lithium iron phosphate LFP can be cited as examples of positive electrode active materials), Nickel Cadmium (Ni-cd), Nickel-Metal-Hydride (Ni-MH), Sodium-ion, Lead or even fuel cell for example. More precisely, a Lithium-ion cell is composed mainly of a porous positive electrode, a porous negative electrode, a separator and an electrolyte (which can be liquid, polymeric or solid). The operating principle of a Lithium-ion cell is based on the reversible exchange of Lithium ions between the two porous electrodes.

[0031] In [Fig.l], an electrochemical energy storage element 1 according to the invention of the prismatic cell type is shown schematically. The term prismatic means that the volume of the storage element has a rigid enveloping body in the shape of a polyhedron. The envelope 2 encloses the chemistry of the storage element and comprises rigid rectangular walls delimiting a substantially parallelepiped shape allowing the arrangement of the storage element 1 in an assembly forming a battery block or module whose desired voltage and energy capacity is determined by the number of interconnected electrochemical energy storage elements. The rigid rectangular walls facilitate the assembly of several modules in rows and stages stacked against the walls 4 and 5. The walls comprise two main walls 5 delimiting the largest dimensions of the volume and side walls 4 determining the thickness of the volume.Envelope 2 has the function of a rigid case enclosing the chemistry of the storage element.

[0032] Furthermore, the geometry of the envelope 2 is mainly prismatic but differs significantly from conventional storage elements in that at least one corner of the envelope, among the four corners, comprises a polarity terminal 7 adapted for the electrical connection of the storage element 1. The polarity terminal 7 is positioned on a wall 3 of the body having a concave surface profile in an arc of a circle forming a recess in the surface of the prismatic body. The terminal 7 is intended for the insertion and rotation of a removable electrical connection element which will be described more precisely in the remainder of the description. The polarity terminal 7 is provided to form a quarter of the circumference of a circular profile in cooperation with other polarity terminals of equivalent shape belonging to adjacent electrochemical storage elements so as to delimit a tubular zone for insertion and rotation of an electrical connection element.

[0033] In this non-limiting embodiment, the storage element 1 comprises four polarity terminals 7, 8, 9 and 10, two positive terminals 7 and 8 in the upper part and two negative terminals 9 and 10 in the lower part of the diagram. The polarity terminals are distributed in the four corners of the prismatic envelope 2. Other variants of distribution of the polarities in the corners are conceivable. Unlike a conventional prismatic storage element, each corner has a concave side wall 3, and not rounded or with a projecting edge. Alternatively, it is envisaged that the storage element 1 comprises a single corner polarity terminal with a concave profile, two corner polarity terminals, or three corner terminals. The storage element comprises at least one corner polarity terminal.

[0034] Furthermore, a corner polarity terminal 7 comprises on the surface a rigid electrical connection member 6 arranged projecting and curved opposite the surface of the wall 3. The electrical connection member is electrically connected to one of the two electrodes and is intended to cooperate with a removable electrical connection element. The electrical connection member 6 is connected to the positive electrode. The electrical connection member of terminal 8 is also connected to the positive electrode, while the electrical connection members of terminals 9 and 10 are both connected to the negative electrode. The internal conductive elements, enclosed in the casing 2, necessary for these connections are not shown. The electrical connection member 6 has the function of electrically connecting the polarity terminal to another terminal of opposite polarity of another adjacent storage element.Furthermore, the electrical connection member 6 ensures, thanks to its rigidity, that the electrical connection is maintained in a locked position by pressure on a surface of the removable connection element.

[0035] In one embodiment, the electrical connection member 6 is a rigid strip 6 made of a metallic conductive material, for example copper, aluminum or steel, and may be partially covered with an insulating coating. For example, the end zone of the strip exposes a conductive zone intended to cooperate with a conductive part of a connection element. The material used is rigid in the sense that its function is to lock the electrical connection when it cooperates with the removable electrical connection element. However, slight mechanical deformation is possible. The connection member may be a strip folded to form the curvature. Alternatively, the connection member may be a rod, pemo or any rigid mechanical element suitable for this function.

[0036] It will be noted that the connecting member 6 extends opposite the concave wall in an arc of a circle 3 so as to allow its insertion into a notch of the removable connecting element provided for this purpose. The connecting member 6 therefore comprises a projecting and curved part outside the casing 2 and a part enclosed in the casing 2 which is electrically connected, directly or indirectly via a conductive element (not shown), with a positive or negative electrode.

[0037] In [Fig. 2], a modular battery 20 in accordance with the invention is shown schematically. For the sake of clarity, only four prismatic storage elements IA, IB, IC, and 1D are shown. Conventionally, the battery 20 comprises a rigid casing or housing (not shown), generally of cubic shape, enveloping all of the electrically interconnected electrochemical energy storage elements IA, IB, IC, and 1D.

[0038] The electrochemical energy storage elements IA, IB, IC and 1D are arranged in rows (along a horizontal plane) and / or in stages (along a vertical plane with reference to the axis of gravity). The choices of electrical connection of the polarity terminals are determined by the removable electrical connecting elements 11. These connecting elements 11 are inserted into the tubular cavities 22 formed by the concave walls 3A in the corners of the storage elements IA, IB, IC, and 1D. The rectangular walls of the adjacent storage elements are brought into contact in the row and / or the stack. The storage elements can be arranged in contact by the main wall and the thickness wall. In the same tubular cavity 22, it is possible to connect the storage elements when the connecting element 11 is inserted, in a row from left to right or from right to left, as illustrated by the two arrows, or vertically from one stage to another.The battery is modular in the sense that from the same block of storage elements, it is possible to easily configure several current paths depending on the chosen combination of removable electrical connection elements.

[0039] The battery 20 is made up of a set of identical storage elements forming a block each having four corner polarity terminals in accordance with the description given in [Fig.l]. Alternatively, the battery 20 may be made up of a set of storage elements having four corner polarity terminals and the storage elements in the peripheral zone of the block may comprise two corner polarity terminals on the internal side of the block. The external corners facing the battery housing may be provided with a concave wall without a connecting member therefore not having the function of a polarity terminal, or alternatively, may have a different geometry, such as a ridged or rounded wall. This latter configuration makes it possible to reduce the cost of an energy storage element by limiting the number of connecting members.

[0040] Furthermore, the storage elements 1A, 1B, 1C and 1D are electrically interconnected via the electrical connection elements 11, when the latter are inserted into the tubular cavities 22, by contact of the electrical connection members 6 of each storage element with conductive parts on the lateral surface of the electrical connection elements. The electrical connection elements 11 are removable elements in the shape of a cylinder to allow their insertion into tubular cavities. They are adapted to be inserted in translation and then to be actuated in rotation, in the clockwise and anti-clockwise directions, in order to lock and unlock the electrical connection between two storage elements, electrically and mechanically.

[0041] An electrical connecting element has the function of connecting two polarity terminals of two adjacent storage elements and of mechanically stiffening the entire block in the battery case. The configuration of the current paths is determined by the presence or absence of a conductive part on the lateral surface opposite the polarity terminal. A connecting element comprises several notches 12, in this example four notches, distributed over four parts of the circumference of the cylinder defined by the lateral surface. A connecting element comprises a lateral surface of circular profile and two bases in the form of a toothed disc or hooks formed by the notches 12. A connecting element may comprise at least one notch 12, two notches or three notches.An electrical connection is made through the cylindrical body either from one notch to another notch, in particular to configure a current path on the same row, or in the same notch, to configure a current path from one stage to another. The opening of a notch 12 extends over the entire length of the connecting element so as to allow the passage of a connecting member in the notch during its insertion.

[0042] An electrical connection element 11 may be made of an electrically conductive body, made of metallic material, for example copper, aluminum or steel, and covered by an insulating coating to delimit the conductive parts exposed to the outer surface and intended to be brought into contact with the polarity terminals.

[0043] In another variant, the electrical connecting element may be made of a cylindrical body made of non-conductive plastic material and comprise a metal part embedded in the plastics of the cylindrical body, which metal part determines the conductive parts exposed to the outer surface intended to be brought into contact with the polarity terminals, as well as the conductive path through the cylindrical body between two notches. A connecting element may comprise conductive parts inside a notch on the surface of the bottom only in order to secure the electrical contact.

[0044] In [Fig. 3], a schematic diagram shows an exemplary embodiment of a connecting element 11 in radial section. The section is substantially circular in shape and comprises four notches 13, 14, 15 and 16 forming cavities extending towards the inside of the cylindrical body. These cavities are intended to receive the connecting members of a polarity terminal and to cooperate in rotation to lock the electrical connection when the connecting element 11 is inserted between electro- adjacent energy storage chemicals in a block.

[0045] The two notches 13 and 14 only each comprise a conductive part 17 and 18 respectively at the bottom of the cavity to secure the electrical contact. A conductive element 21 integrated in the cylindrical body is provided to make the electrical connection between the two conductive parts 17 and 18. The notches 15 and 16 are devoid of conductive parts. The cylindrical body is in this example a plastic material. Alternatively, the body is conductive and the insulating surface parts are covered with an insulating coating, for example a plastic.

[0046] The cylinder further comprises a groove 19 adapted to actuate the connecting element in rotation by means of a tool. Any other clamping interface means can be envisaged to actuate the connecting element 11 in rotation.

[0047] In [Fig.4], a block diagram more specifically illustrates the electrical connection element 11 and the polarity terminal 7 of an electrochemical energy storage element in an unlocked position, in the left part of the diagram, and a locked position of the electrical connection, in the right part of the diagram.

[0048] In the unlocked position, the connecting element 11 is inserted between a group of electrochemical storage elements, only one being shown in the top right quarter of the figure. The rigid connecting member 6 is inserted into the opening of the notch 14. The connecting member 6 and the conductive part 18 of the notch are not in electrical contact. In this unlocked position, an operator can still remove the connecting element 11. The cylindrical profile of the connecting element 11 is arranged opposite the arcuate profile of the wall 3 with a clearance suitable for carrying out its insertion and rotation. The groove 19 is arranged so as to easily allow locking in rotation. In this variant, the second notch 13 also comprises a conductive part, and the notches 15 and 16 do not have one.

[0049] In the locked position, the conductive part 18 of the connecting element 11 is in electrical contact with the connecting member 6 of the polarity terminal 7 by its end pressing on the bottom of the notch 14. The rigidity of the connecting member 6 makes it possible to exert sufficient pressure to stiffen the mechanical link between the storage elements of a block as a whole.

[0050] Optionally, for each notch, the thickness of the body of the cylinder between the cavity 14 and the circumference of the connecting element 11 increases towards the bottom of the notch. This allows the clamping pressure of the electrical connection to increase as the rotation progresses. This improves the security of maintaining the connection. However, this configuration is not obligatory. It will be noted that several geometries of the notch and the connecting member are adapted to insert the connecting element 11 into the tubular cavity, then to actuate it in rotation in order to lock the electrical connection.

[0051] Furthermore, marks or signals may be provided on the base of the connecting element 11 and on a visible wall of an electrochemical storage element making it possible to signal an unlocked position and a locked position of the connecting element, for example a set of aligned arrows indicating each position.

[0052] In [Fig.5A] and [Fig.5B], two variant embodiments of the connecting element are shown schematically in order to present several combinations of connections configurable in a battery.

[0053] In [Fig.5A], the connecting element 51 allows the electrical connection between two notches positioned in the same stage of electrochemical energy storage elements. The double arrow indicates the two parts 52 and 53 of the circular section which can be electrically connected, in this case a half-circular section. The connecting element 51 has a length substantially equal to the thickness of a prismatic electrochemical element.

[0054] In [Fig.5B], the connecting element 54 allows the electrical connection between two electrochemical elements arranged on two levels, that is to say in a stack. The double arrow indicates the two parts 55 and 56 electrically connected. The connecting element 54 has a length substantially equal to the thickness of two prismatic electrochemical elements.

[0055] In [Fig.6A], a battery is shown schematically and comprises several prismatic electrochemical elements symbolized by cubes for the sake of simplifying the drawing and are arranged in two rows of four storage elements on two levels. The connecting elements are symbolized by circles. The plane (X, Y) determines the plane of a level and the Z axis determines the stacking axis of the two levels. Electrical connections are configured between two stacked storage elements belonging to different levels along the Z axis.

[0056] In [Fig.6B], a battery is shown schematically and comprises several prismatic electrochemical elements arranged in three rows of four electrochemical elements on the same level in the plane (X, Y). Electrical connections are configured between two adjacent electrochemical elements of the same plane, in this example along the X axis or along the Y axis.

[0057] The invention makes it possible to improve the modularity of configuration of a battery. From the same block it is possible to create several current paths by combining connecting elements.

[0058] In [Fig.7], an alternative embodiment of the locking function performed by a connecting element 71 and a storage element comprising an electrical connecting member 77 is shown. The position shown schematically is the locked position of the electrical connection. The connecting element 71 comprises a notch 74 comprising the conductive part 75 at the bottom of the cavity. In addition, the conductive part comprises a lip 72 providing the locking stop function. The lip 72 cooperates with a groove or recess 73 of the connecting member 77 opposite the lip 72 in order to house the lip 72 when the connecting element reaches the locking position. The locking of the electrical contact is thus improved. The rigidity of the connecting member 77 and the lip 72 exert a counterforce to the loosening rotation, which has the effect of securing the electrical connection. The zone 76 can be made of a material having elastic or flexible properties allowing movement of this zone. This elasticity has the effect of facilitating the insertion of the connecting member and improving the feeling of locking for the operator when rotating the connecting element 71.

[0059] In [Fig.8], another variant embodiment of the electrical connection is shown. The removable connecting element 81 comprises a first conductive part 87 in the cavity internal to the notch 86 as well as a second conductive part 84 extending on the external periphery of the cylindrical body at the edge of the opening of the notch 86. The polarity terminal 82 comprises the electrical connecting member 85 opposite the concave wall having its end which extends in the internal part of the notch 86. The connecting member 85 further comprises an electrically conductive surface 83 arranged on the surface of the concave wall and intended to be in electrical contact with the second part 84. Thus, the second conductive part 84 is in contact with the conductive surface 83 of the concave profile of the polarity terminal 82 when the connecting element 81 and the connecting member 85 are in the locked position. The electrical connection is thus improved and secured.Alternatively, this embodiment may also include a lip and a recess to secure the connection.

[0060] The battery according to the invention applies to traction batteries of electrified vehicles. The invention facilitates the assembly of power batteries comprising numerous electrochemical energy storage elements and improves electrical safety.

[0061] The invention is described in the above by way of example. It is understood that the person skilled in the art is able to produce different variant embodiments of the invention by associating, for example, the different characteristics above taken alone or in combination, without departing from the scope of the invention.

Claims

Claims

1. Electrochemical energy storage element (1) for a battery comprising two electrodes and a rigid casing (2) forming a prismatic body comprising walls (3, 4, 5) enclosing the two electrodes, characterized in that it comprises at least one polarity terminal (7) positioned in a corner of the body adapted for the electrical connection of the storage element (1), in that said polarity terminal (7) is positioned on a wall (3) of the body having a concave surface profile in an arc of a circle forming a recess in the surface of the prismatic body intended for the insertion and rotation of a removable electrical connection element (11), and in that said polarity terminal (7) comprises a rigid electrical connection member (6) arranged projecting from the wall (3) and electrically connected to one of the two electrodes.

2. Electrochemical energy storage element according to claim 1 in which the electrical connection member (6) extends in a curved manner opposite said concave wall (3) in an arc of a circle, the electrical connection member (6) being adapted to be configured in a locked position and in an unlocked position by the rotation of said electrical connection element (11).

3. An electrochemical energy storage element according to claim 1 or 2, comprising a plurality of polarity terminals (7, 8, 9, 10) distributed on corners of the prismatic body.

4. Battery (20) comprising a set of electrochemical energy storage elements (IA, IB, IC, 1D) arranged in a block and removable electrical connection elements (11) having a cylindrical body for the electrical connection of the polarity terminals of all of said storage elements (IA, IB, IC, 1D), characterized in that each storage element (IA, IB, IC, 1D) is according to any one of claims 1 to 3, in that the walls (3A) of the polarity terminals of adjacent storage elements (IA, IB, IC, 1D) of the block have the concave surface profiles in an arc of a circle arranged opposite so as to form tubular cavities (22) adapted to the insertion and rotation of the electrical connection elements (11), and in that the storage elements (IA, IB, IC, 1D) are electrically interconnected via said electrical connection elements (11). electrical connection (11) by contact of the electrical connection members (6) of each storage element (IA, IB,IC, 1D) with conductive parts on the lateral surface of the, electrical connection elements (11).

5. Battery (20) according to claim 4, wherein the connecting elements (11) each comprise notches (12) extending longitudinally on the lateral surface of the cylindrical body arranged so as to receive the electrical connecting members (6) of the storage elements (IA, IB, IC, 1D) when the connecting elements (11) are inserted into the tubular cavities (22), said notches (12) of the connecting elements (11) and the electrical connecting members (6) being adapted to cooperate mechanically in rotation so as to configure the electrical connecting members (6) and the connecting elements (11) in a locked position and in an unlocked position.

6. Battery (20) according to claim 5, in which each connecting element (11) comprises on the lateral surface at least a first notch (13) whose internal cavity comprises the electrically conductive part (17) and a second electrically insulating notch (15), the first notch (13) being adapted to ensure the mechanical and electrical connection in the locked position between two adjacent storage elements (IA, IB, IC, 1D), the second notch (15) being adapted to ensure the mechanical connection, only, in the locked position between two adjacent storage elements (IA, IB, IC, 1D).

7. Battery according to any one of claims 4 to 6, in which the electrical connection elements (81) further comprise on the outer surface of the cylindrical body a convex conductive part (84) and the connection members (85) of the polarity terminals (82) further comprise a conductive surface (83) positioned on the concave wall of the terminal (82), said conductive surface area (83) being electrically connected to one of the two electrodes, said conductive part (84) of the connection element and said conductive surface (83) of the terminal (82) being electrically connected in the locked position.

8. Battery according to any one of claims 4 to 7 in which the connecting members (77) of the polarity terminals comprise a recess (73) and the connecting elements (71) a lip (72), said recess (73) and said lip (72) being arranged to cooperate in abutment in the locking position.

9. Battery according to any one of claims 4 to 8 in which the storage elements (IA, IB, IC, 1D) are arranged in at least two rows on at least two levels and in which first connecting elements electrically interconnect two storage elements storage of the same row and second connecting elements electrically interconnect two storage elements from one level to another.

10. An electrified vehicle comprising a traction battery according to any one of claims 4 to 9.