Electrochemical element for a battery and corresponding battery

Description

[0001] The present invention relates to an electrochemical element for a battery, of the type comprising a first electrode of a first polarity, a first connecting member of the first polarity, a second electrode of a second polarity, a second connecting member of the second polarity, an envelope comprising a first wall and a second wall, the envelope comprising at least one first edge and at least one second edge, the first and second edges forming an enveloping geometric shape having at least one corner.

[0002] Electrochemical cells and batteries are known from WO95 / 16283. The electrochemical cell disclosed by this document comprises connecting tabs arranged in the corners of the electrochemical cell.

[0003] The battery made from electrochemical elements includes a plastic casing. The electrochemical element in this document is used to manufacture parallelepiped batteries.

[0004] Other electrochemical assemblies or electrochemical batteries are known from CN108400385; WO2016 / 205663A1 (EP3311443); KR20160041402A; US10490781B2 (US20150364729A): CN202373667U; US2013101891A1; WO2012057854A1; WO2005039013A2 (EP1678804); WO03026042A1 (EP1428272); US5419982 A; and WO9120100A1 (EP0487699).

[0005] The aim of the invention is to provide an electrochemical element which has a significant electrical energy storage capacity for a given volume. Furthermore, the electrochemical element should be easy and economical to manufacture and have significant operational safety.

[0006] To this end, the invention relates to an electrochemical element for the aforementioned battery, characterized in that the first connection member of the first polarity and the second connection member of the second polarity are arranged entirely inside the enveloping geometric shape, in that the first connecting member of the first polarity is arranged in a first corner of the enveloping geometric shape and the second connecting member of the second polarity is also arranged in the first corner of the enveloping geometric shape.

[0007] According to particular embodiments of the electrochemical element for battery, the latter may comprise one or more of the following characteristics: The enclosing geometric shape is an enclosing quadrilateral, in particular a rectangle or a trapezoid. A connection member of the first polarity is arranged exclusively in a single corner of the enclosing geometric shape and a connection member of the second polarity is arranged and a connection member of the electrochemical element is arranged in no other possibly present corner of the enclosing geometric shape. The first connection member of the first polarity and the second connection member of the second polarity are arranged side by side or the first connection member of the first polarity and the second connection member of the second polarity are juxtaposed.The first connection member of the first polarity comprises a terminal portion and / or wherein the second connection member of the second polarity comprises a terminal portion, wherein each terminal portion is adapted to be electrically connected to an associated terminal and wherein each terminal portion has a substantially triangular shape. The electrochemical element comprises a plastic connecting element which holds the first connection member of the first polarity and the second connection member of the second polarity together in a determined configuration and which electrically insulates the first connection member of the first polarity from the second connection member of the second polarity. The connecting element is overmolded around the first connection member of the first polarity and the second connection member of the second polarity.The first connecting member of the first polarity and / or the second connecting member of the second polarity is or are fixed to their respective electrode in particular by ultrasonic welding. The first wall and the second wall each comprise a metal base sheet and in which the metal base sheets each have a thickness of between 20 µm and 150 µm, in particular either between 30 µm and 60 µm or between 60 µm and 100 µm or between 60 µm and 90 µm.

[0008] The invention further relates to a battery comprising a casing and at least one electrochemical element, the battery preferably comprising a first terminal and a second terminal, characterized in that the at least one electrochemical element (10) is an element as defined above, and in that preferably the first connection member of the first polarity is electrically connected to the first terminal and the second connection member of the second polarity is electrically connected to the second terminal.

[0009] The invention will be better understood on reading the following description, given solely by way of example and with reference to the appended drawings, in which: [ Fig 1 ] There Figure 1 is a schematic front view of a battery comprising an electrochemical element according to a first embodiment of the invention; [ Fig 2 ] There Figure 2 is a front view of the electrochemical element of the Figure 1 , one wall of the envelope being omitted; [ Fig 3 ] There Figure 3 is a schematic sectional view of the electrochemical element of the Figure 1 ; [ Fig 4 ] There Figure 4 is an enlarged view of a detail of the electrochemical element of the Figure 1 ; [ Fig 5 ] There Figure 5 is an enlarged view of a detail of the Figure 2 ; [ Fig 6 ] There Figure 6 is a perspective view of a connection assembly of an electrochemical element of the Figures 1 à 5 , the connection assembly being according to a first embodiment; [ Fig 7 ] There Figure 7 is a plan view of the connection assembly of the Figure 6 , [ Fig 8 ] There Figure 8 is a front view of the connection assembly of the Figure 6 ; [ Fig 9 ] There Figure 9 is a perspective view of a connection assembly according to a second embodiment, the view being identical to that of the Figure 6 ; [ Fig 10 ] There Figure 10 is a plan view of the connection assembly of the Figure 9 , [ Fig 11 ] There Figure 11 is a front view of the connection assembly of the Figure 9 ; [ Fig 12 ] There Figure 12 is a side view of the connection assembly of the Figure 9 ; And [ Fig 13 ] There Figure 13 is a perspective view of the connection assembly according to a third embodiment, the view being identical to that of the Figure 6 .

[0010] The following description contains technical features of the invention. These technical features, although presented in a technical context and possibly in combination with other technical features, can be used individually in each case, without the other technical features, as far as this is technically possible.

[0011] In the description of the different embodiments, similar elements bear the same references. Also, unless otherwise indicated, each characteristic described with reference to an embodiment of the invention or to a variant of an embodiment is applicable in isolation or in any technically possible combination to the other embodiments or variants.

[0012] On the Figure 1 a battery according to a first embodiment of the invention is shown, designated by the general reference 2. The battery 2 is an electrochemical battery as usually used in electric vehicles. However, other fields of application of the battery 2 are conceivable, such as energy storage, electric mobility, aviation, railways.

[0013] The battery 2 comprises a casing 4 or container and at least one electrochemical element 10. In practice, the battery 2 comprises several electrochemical elements 10 connected in series or in parallel in order to obtain the desired electrical voltage and / or capacity. The electrochemical element 10 is arranged in the casing 4.

[0014] The casing 4 is for example of parallelepipedal shape, in particular rectangular, and comprises casing walls, a first terminal 14 and a second terminal 16. The casing walls are more rigid than the walls of the electrochemical element 10 (see below).

[0015] Battery 2 may include a cooling device, which is not shown.

[0016] The electrochemical element 10 or each electrochemical element 10 extends along a median plane PM (see Figure 3 ), which is parallel to the plane of the Figures 1 And 2 and perpendicular to the plane of the Figure 3 .

[0017] The electrochemical element 10 or each electrochemical element 10 comprises a first electrode of a first polarity 22, a first connection member of the first polarity 24, a second electrode of a second polarity 26, and a second connection member of the second polarity 28.

[0018] The electrochemical element 10 is for example of the Lithium-Ion type. The first electrode of the first polarity 22 comprises at least one current collector formed from a metal strip, for example aluminum, coated on at least one face with a mixture containing the active material.For example, in the case of a lithium secondary battery, the first electrode of the first polarity contains an active material which may be a metal oxide comprising lithium atoms, such as lithium cobalt dioxide LCO (LiCoO 2 ), NMC (LiNixMnyCo 1-xy O 2 ), NCA (LiNixCoyAl 1-xy O 2 ), compounds of the type LiMPO 4 where M is selected from the group consisting of Fe, Co, Ni, Mn and a mixture thereof (e.g. LiFePO 4 ), LMO (LiMn 2 O 4 ), compounds of the type Li x Fe 1- yM y PO 4 where M is selected from the group consisting of B, Mg, AI, Si, Ca, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Y, Zr, Nb and Mo and 0.8≤x≤1.2; 0≤y≤0.6 (e.g. LiMnFePO 4 ), LiVPO 4 type compounds or similar lithium compounds. The first electrode of the first polarity 22 is for example the positive electrode.

[0019] The second electrode of the second polarity 26 comprises at least one current collector formed from a metal foil, for example copper, coated on at least one face with a mixture containing the active material. For example, in the case of a lithium secondary battery, the second electrode contains an active material which may be a carbon material capable of inserting lithium atoms, such as graphite or silicon, a lithiated titanium oxide LTO (for example of formula Li 4 Ti 5 O 12 ) or a titanium and niobium oxide TNO (for example of formula TiNb 2 O 7 ). The second electrode of the second polarity 26 is for example the negative electrode.

[0020] The electrochemical element 10 comprises a separator, separating the first electrode 22 from the second electrode 26. In the case of a Lithium-Ion electrochemical cell, the separator is permeable to Lithium ions, but electrically insulating. The separator is for example a polyolefin membrane.

[0021] The first electrode of the first polarity 22 and the second electrode of the second polarity 26 extend generally parallel to the median plane PM.

[0022] The electrochemical element 10 also comprises an electrolyte, which may be liquid, such as an organic electrolyte containing lithium salts such as LiPF 6 , solid or gel, such as Polyvinylidene fluoride (PVDF) polymers or a copolymer of Polyvinylidene fluoride and Hexafluoropropylene (PVDF-HFP).

[0023] The first connection member of the first polarity 24 is electrically connected to the first terminal 14 and the second connection member of the second polarity 28 is electrically connected to the second terminal 16. The connection members are adapted to collect the current from the associated electrode. The or each first connection member of the first polarity 24 is fixed by welding or brazing to the associated current collector or to the associated electrode. Likewise, the or each second connection member of the second polarity 28 is fixed by welding or brazing to the associated current collector or to the associated electrode. In particular, the or each first connection member of the first polarity 24 is fixed by ultrasonic welding to the associated current collector or to the associated electrode. Likewise, in particular the or each second connection member of the second polarity 28 is fixed by ultrasonic welding to the associated current collector or to the associated electrode.This is illustrated by the ultrasonic welding zones 110 on the . Figure 5 Ultrasonic welding is particularly advantageous because it allows thin sheets to be joined.

[0024] In the present embodiment, the electrochemical element 10 comprises exactly a single first connection member of the first polarity 24 and a single second connection member of the second polarity 28. In other words, the connection members of the electrochemical element are constituted by a single first connection member of the first polarity and a single second connection member of the second polarity.

[0025] The electrochemical element 10 or each electrochemical element 10 comprises an envelope 40 provided with a first wall 42 and a second wall 44. The envelope 40 is of the “pouch” type, that is to say comprises relatively flexible and easily deformable walls. The walls of the envelope 40 are therefore more easily deformable and less rigid than the walls of the casing 4.

[0026] On the Figure 3 the electrochemical element 10 is shown in section along line III-III of the Figure 1 . The casing 4 is omitted on the Figure 3 .

[0027] The first wall 42 and the second wall 44 each comprise a metal sheet, in particular aluminum, each of which has a thickness EF of between 20 µm and 150 µm, in particular between 30 µm and 60 µm. Alternatively, the thickness EF may advantageously be between 60 µm and 100 µm or between 60 µm and 90 µm. The first wall 42 and the second wall 44 may further comprise a coating, for example made of thermoplastic material, arranged on the metal sheet. For example, the walls of the envelope are formed from a multilayer film comprising, from the outside to the inside, an electrically insulating and mechanically protective layer, an aluminum sheet and a layer of polypropylene (PP) and / or chemically modified polypropylene (PPa - acid modified polypropylene).Preferably, the walls of the envelope are formed from a multi-layer film comprising, from the outside to the inside, a layer of Polyethylene terephthalate (PET), a layer of Nylon, an aluminum foil and a layer of polypropylene (PP) and / or chemically modified polypropylene (PPa - acid modified polypropylen).

[0028] As visible on the Figure 1 , the envelope 40 comprises two first edges 48, in this case substantially parallel to each other, and two second edges 50, in this case substantially parallel to each other, and in this case substantially perpendicular to the first edges. In this case, each of the first edges 48 is a long edge and each of the second edges 50 is a short edge. The term "short" means that the edge is shorter than each of the long edges and the term "long" means that the edge is longer than each of the short edges. The first edges 48 are for example edges opposite each other and the second edges 50 are for example also edges opposite each other. The first and / or the second edges 48 and 50 may be substantially rectilinear.

[0029] Alternatively, the first and / or second edges 48 and 50 are not parallel, and form for example a trapezoid. Alternatively, the first and / or second edges 48 and 50 are not of different length, but of identical length and therefore form for example a square or a rhombus. Alternatively, the envelope 40 comprises at least one first edge and one second edge which are non-parallel, preferably substantially perpendicular to each other, and which together form a corner.

[0030] These first and second edges 48 and 50 generally form, seen from the front, an enveloping quadrilateral RE, in this case an enveloping rectangle ( Figure 1 ), which is defined by the first and second edges 48 and 50 and by the extension of these edges. The edges 48 and 50 coincide with the enveloping quadrilateral. The enveloping quadrilateral RE comprises four corners C1, C2, C3, and C4. The four corners C1 to C4 are arranged clockwise in the Figures. Depending on the length of the first and second edges 48 and 50 and their arrangement, the enveloping quadrilateral RE can also be any quadrilateral, a square, a rhombus or a trapezoid. Alternatively, the enveloping quadrilateral RE is replaced by an enveloping geometric shape having at least one corner, for example a semicircle shape.

[0031] The first connection member of the first polarity 24 is arranged in a first corner of the enveloping quadrilateral RE, in this case C1, and the second connection member of the second polarity 28 is also arranged in the first corner of the enveloping quadrilateral, in this case C1. The first connection member of the first polarity 24 and the second connection member of the second polarity 28 are therefore arranged in the same corner of the enveloping quadrilateral RE. The first connection member of the first polarity 24 and the second connection member of the second polarity 28 are therefore located closer to this corner C1 than to other corners C2 to C4.

[0032] In the present case, in only one corner of the enveloping geometric shape or of the enveloping quadrilateral is arranged a connecting member of the first polarity and is arranged a connecting member of the second polarity. In no other present corner of the enveloping geometric shape or of the enveloping quadrilateral RE is arranged a connecting member of the electrochemical element.

[0033] Depending on the method of implementation of the Figures 1 à 8 , the metal sheet of the first wall 42 and the metal sheet of the second wall 44 are two individual and separate base sheets 52 of metal, each of which has four edges. Each of the first edges 48 and the second edges 50 is formed by two edges or edge zones of the two base sheets superimposed and fixed to each other, for example by laser welding or by heat welding. This is shown in the Figure 3 The envelope 40 therefore comprises four sides formed by a fixing line, in particular a welding line.

[0034] According to the invention, seen from the front, the first connection member of the first polarity 24 is arranged entirely inside the enveloping quadrilateral RE. Furthermore, seen from the front, the second connection member of the second polarity 28 is arranged entirely inside the enveloping quadrilateral RE. In other words, the first and second terminals 24, 28 are arranged entirely inside a cylinder having a section of the enveloping quadrilateral RE.

[0035] Each first connection member of the first polarity 24 and / or each second connection member of the second polarity 28 has edges which, when viewed from the front, are set back relative to it, i.e. extend completely inside the enveloping quadrilateral RE. This is advantageous, since during module assembly an unwanted contact between the connection members and the casing is avoided. Alternatively, these edges coincide with the enveloping quadrilateral RE.

[0036] On the Figure 2 is represented the electrochemical element 10 of the Figure 1 , also seen from the front, but the first wall 42 of the envelope 40 being omitted.

[0037] The connecting member of the first polarity 24 is constituted by a connecting member tab (called "tab" in English) which is fixed to a superposition of electrode sheets. Similarly, each second connecting member of the second polarity 28 is constituted by a connecting member tab which is fixed to a superposition of electrode sheets.

[0038] Each of the connecting member tabs comprises a metal sheet and optionally a coating. The connecting member tab of the first connecting member of the first polarity 24 is for example made of aluminum. The connecting member tab of the second connecting member of the second polarity 28 is for example made of copper and optionally coated with nickel.

[0039] Each of the connecting member tabs has a trapezoidal shape (see Figure 7 ). Each trapezoid comprises two parallel trapezoid bases. Each trapezoid comprises a first trapezoid side edge, which is substantially perpendicular to the trapezoid bases. Each trapezoid comprises a second trapezoid side edge which is oblique to the trapezoid bases.

[0040] The second trapezoidal lateral edge is parallel to or may coincide with the associated edge 48 or 50 of the casing 40. The two second trapezoidal lateral edges of the two adjacent tongues of the connecting member form between them an angle of for example 90°.

[0041] The two trapezoid bases of the two connecting member tabs are parallel to each other.

[0042] The first connection member of the first polarity 24 and the second connection member of the second polarity 28 are arranged side by side. In addition, the first connection member of the first polarity 24 and the second connection member of the second polarity 28 are arranged in a coplanar manner with respect to each other in the median plane PM or in a plane parallel to the median plane PM. Also, the first connection member of the first polarity 24 and the second connection member of the second polarity 28 are arranged apart from each other along the median plane PM, without overlap. The distance between the connecting parts is referenced ET on the Figure 4 .

[0043] The electrochemical element 10 comprises a connecting element 60 which holds the first connection member of the first polarity 24 and the second connection member of the second polarity 28 together in a determined configuration, and which electrically isolates the first connection member of the first polarity 24 from the second connection member of the second polarity 28.

[0044] For this purpose, the connecting element 60 is made of plastic, in particular thermoplastic, such as polypropylene or polyethylene. Preferably, the connecting element 60 is overmolded around the first connection member of the first polarity 24 and the second connection member of the second polarity 28.

[0045] The connecting element 60, the first connection member of the first polarity 24 and the second connection member of the second polarity 28 together constitute a connection assembly 100 which can be handled as a single unit. The connection assembly 100 of the electrochemical element of the Figures 1 à 5 is represented on the Figures 6 à 8 . This connection assembly 100 is an assembly according to a first embodiment. The connection assembly 100 defines a plane PMC ( Figure 8 ), which in the assembled state of the electrochemical element, coincides with the median plane PM. The connection assembly 100 also defines a central axis XX, which extends in the PMC plane and which is an axis of symmetry of the connection assembly 100.

[0046] The connecting element 60 comprises a holding portion 62 which surrounds a circumference of the first connection member of the first polarity 24 and a circumference of the second connection member of the second polarity 28. The holding portion 62 is in this case essentially a rectangular profile bar.

[0047] The connecting element 60 is provided with two wings 64, each arranged at one end of the holding portion 62 and having a thickness smaller than the thickness of the holding portion. In the assembled state of the electrochemical element 10, the wings 64 form connecting joints with the first wall 42 and the second wall 44.

[0048] Each of the first connection member of the first polarity 24 and the second connection member of the second polarity 28 comprises an electrode portion 66 and a terminal portion 68. The terminal portion 68 has a substantially triangular shape. In this case, the electrode portion 66 comprises the first lateral edge of the trapezoid of the connection member tab and the terminal portion 68 comprises the second lateral edge of the trapezoid of the connection member tab.

[0049] The terminal portion 68 is adapted and intended to be electrically connected to the associated terminal 14 or 16 and the electrode portion 66 is adapted and intended to be electrically connected to the associated electrode 22, 26.

[0050] The holding portion 62 defines a boundary between the electrode portion 66 and the terminal portion 68 of each connection member 24, 28.

[0051] The connecting element 60 is advantageously provided with a spacer portion 70, which extends from the holding portion 62 along a trapezoid base of the connecting member tab of the first polarity and along a trapezoid base of the connecting member tab of the second polarity. The spacer portion 70 covers the edge of each connecting member tab and extends on either side of the median plane PM. The spacer portion 70 has a length less than the length of the associated trapezoid base. The spacer portion 70 contributes to electrically insulating the first connecting member of the first polarity 24 and the second connecting member of the second polarity 28 by maintaining the physical distance.

[0052] On the Figures 9 à 12 A connection assembly 100 is shown according to a second embodiment. This embodiment differs from the first embodiment only in the following. Similar elements bear identical references.

[0053] The first connection member of the first polarity 24 and the second connection member of the second polarity 28 are not arranged side by side along the median plane PM, but overlap or are juxtaposed.

[0054] In addition, the first connection member of the first polarity 24 and the second connection member of the second polarity 28 are arranged on either side of the median plane PM, respectively of the plane PMC.

[0055] The terminal portion 68 of each of the first connection member of the first polarity 24 and the second connection member of the second polarity 28 has a substantially isosceles triangle shape. The apex of the isosceles triangle advantageously coincides with the associated corner C1 or is the point of each connection member closest to this corner C1.

[0056] The terminal portion 68 of the first connection member of the first polarity 24 and the terminal portion 68 of the second connection member of the second polarity 28 have identical shapes and, seen perpendicular to the PMC plane (see Figure 10 ), coincide.

[0057] The electrode portion 66 of each of the first connection member of the first polarity 24 and the second connection member of the second polarity 28 has a substantially rectangular shape and a width, measured perpendicular to the axis XX and parallel to the plane PMC, less than half the width of the base of the isosceles triangle of the terminal portion 68.

[0058] In addition, the electrode portion 66 of the first connection member of the first polarity 24 and the electrode portion 66 of the second connection member of the second polarity 28 are offset from each other in the PMC plane so as not to overlap (see Figure 10 ). Thus, the connection of each of the electrode portions 66 to the associated electrode is easy.

[0059] On the Figure 13A connection assembly 100 is shown according to a third embodiment. This embodiment differs from the first embodiment only in the following. Similar elements bear identical references.

[0060] The connecting element 60 does not include a spacer portion 70.

[0061] The electrical insulation between the first connection member of the first polarity 24 and the second connection member of the second polarity 28 is therefore ensured mainly by the distance between the two tabs. The advantage of this embodiment is to have more flexible tabs for connecting several pouches, particularly in the case of thick pouches (total thickness greater than 5 mm).

[0062] Placing the connecting elements in the corners of the cell reduces the inactive electrode area required for connection and maximizes the areas coated by the active electrode material mixture. Grouping two connecting elements in a corner further increases the active electrode areas. Compared to a conventional design with opposite connecting elements, an energy gain of 6.5% can be estimated, for an identical projected surface area.

[0063] In addition, placing the connection members in a corner allows the surface of the connection members to be integrated into the total footprint of the cell and therefore facilitates its integration into the module by giving the possibility of not folding the connection members to connect the cells together. With a conventional design, folding the connection members for the inter-cell connection is necessary if we want to minimize the cell's size. This causes additional handling during module assembly as well as weakening of these connection members.

[0064] Another advantage is that integrating the two connection components in a single location reduces the number of heat seals and therefore potential leak areas. This will consequently increase the reliability of the cell's sealing.

[0065] As a variant, not shown, the electrochemical element 10 comprises a third connection member of the first polarity and a fourth connection member of the second polarity and these connection members are arranged in a corner of the enveloping quadrilateral different from the first corner C1 and in particular in a corner opposite the first corner C1. For example, the third connection member of the first polarity and the fourth connection member of the second polarity are arranged in the corner C3.

[0066] In a further variant, not shown, the electrochemical element 10, instead of comprising a connecting element 60 which connects the first connection member of the first polarity 24 and the second connection member of the second polarity 28, comprises two separate connecting elements 60, each of which surrounds only one of the terminals 24, 28, and which are connected via the walls 42, 44.

Claims

1. An electrochemical element for a battery, of the type comprising - a first electrode of a first polarity (22), - a first connection member of the first polarity (24), - a second electrode of a second polarity (26), - a second connection member of the second polarity (28), - an envelope (40) comprising a first wall (42) and a second wall (44), - the envelope comprising at least one first edge (48) and at least one second edge (50), the first and second edges forming an enveloping geometric shape (RE) having at least one corner (C1), characterized in that the first connection member of the first polarity (24) and the second connection member of the second polarity (28) are arranged completely within the enveloping geometric shape (RE), in that the first connection member of the first polarity is arranged in a first corner (C1) of the enveloping geometric shape and the second connection member of the second polarity is also arranged in the first corner (C1) of the enveloping geometric shape.

2. The electrochemical element according to Claim 1, wherein the enveloping geometric shape (RE) is an enveloping quadrilateral, in particular a rectangle or a trapezoid.

3. The electrochemical element according to claim 1 or 2, wherein exclusively a connection member of the first polarity (24) and a connection member of the second polarity (28) are arranged in only one corner (C1) of the enveloping geometric shape (RE) and in no other corner of the enveloping geometric shape (RE), which may be present, is a connection member of the electrochemical element arranged.

4. The electrochemical element according to any of the preceding claims, wherein the first connection member of the first polarity (24) and the second connection member of the second polarity (28) are arranged side-by-side or wherein the first connection member of the first polarity (24) and the second connection member of the second polarity (28) are juxtaposed.

5. The electrochemical element according to any of the preceding claims, wherein the first connection member of the first polarity includes a terminal portion (68) and / or wherein the second connection member of the second polarity includes a terminal portion (68), wherein each terminal portion (68) is suitable for being electrically connected to an associated terminal (14, 16) and wherein each terminal portion has a substantially triangular shape.

6. The electrochemical element according to any of the preceding claims, wherein the electrochemical element (10) comprises a linking element (60) of plastic material which holds together the first connection member of the first polarity and the second connection member of the second polarity in a predetermined configuration and electrically isolates the first connection member of the first polarity (24) from the second connection member of the second polarity (28).

7. The electrochemical element according to claim 6, wherein the connection member (60) is overmolded around the first connection member of the first polarity (24) and of the second connection member of the second polarity (28).

8. The electrochemical element according to any of the preceding claims, wherein the first connection member of the first polarity (24) and / or the second connection member of the second polarity (28) is or are attached to the respective electrodes thereof, in particular by ultrasonic welding.

9. The electrochemical element according to any of the preceding claims, wherein the first wall (42) and the second wall (44) each comprise a metal base sheet and wherein the metal base sheets each have a thickness (EF) comprised between 20 µm to 150 µm, in particular either between 30 µm and 60 µm or between 60 µm and 100 µm or between 60 µm and 90 µm.

10. A battery, in particular a Lithium-Ion battery, comprising a housing and at least one electrochemical element, the battery preferentially comprising a first terminal (14) and a second terminal (16), characterized in that the at least one electrochemical element (10) is an element according to any of the preceding claims and in that, preferentially, the first connection member of the first polarity (24) is electrically connected to the first terminal (14) and the second connection member of the second polarity (28) is electrically connected to the second terminal (16).