Battery cell insulation element and prismatic battery cell

Abstract

The invention relates to an electrical insulating element (13) for interposed between a current collector (10) and a cover (6) of a prismatic battery cell (1), said insulating element (13) having a lower face (f13) intended to face the current collector (10), and an upper face (fs13) intended to contact the cover (6); the insulating element (13) comprising on its upper face (fs13) raised positioning elements (41, 43) designed to cooperate by complementary shape with complementary elements delimited by the cover (6) in such a way as to block relative translation and relative rotation between the insulating element (13) and the cover (6). The invention also relates to an assembly (5) and a battery cell (1) comprising such an insulating element (13). Figure 1

Description

Title of the invention: Insulation element for battery cell and prismatic battery cell Technical field of the invention

[0001] The present invention relates to the field of prismatic electric battery cells.

[0002] More particularly, the invention relates to an electrical insulation element for electrically isolating a current collector and the cover of the prismatic battery cell. State of the art

[0003] In the field of secondary batteries, and particularly batteries for electric vehicles, it is known to manufacture so-called prismatic battery cells. Their shape allows them to be easily arranged side by side, which is particularly advantageous for building the battery of an electric vehicle. Generally, such battery cells comprise two electrodes: an anode and a cathode in the form of sheets. These electrodes are then stacked or wound to form one or more electrode assemblies that constitute the prismatic battery cell. A porous separator is placed between the anode and the cathode. The electrode assembly is then inserted into a casing that serves, in particular, to protect the electrode assembly and to allow the insertion of an electrolyte for transporting ions between the two electrodes.

[0004] To maximize the battery cell's capacity, it is known to produce two electrode assemblies intended to be inserted inside the same battery cell casing. Furthermore, the prismatic battery cell includes two terminals, located on the lid side, which will be used to make electrical connections with other battery cells.

[0005] In order to convey the current produced by the electrode assemblies to these terminals, it is known in the prior art to use a current collector for each terminal. These current collectors are electrically connected respectively to each type of electrode. They must ensure efficient and reliable collection of the current produced by the electrodes.

[0006] Once the current collection is achieved, it is necessary to ensure that the assembly formed by the electrodes and the current collectors is securely fixed inside the casing, to limit any movement of the assemblies relative to the casing, under normal conditions of battery use.

[0007] Thus, in order to have a prismatic battery cell operating under optimal conditions, it is necessary to achieve precise positioning of the assemblies with respect to the current collectors on the one hand and with respect to the casing on the other. This positioning is a critical step in the positioning process, particularly for large-scale production.

[0008] Furthermore, in order to limit any short circuit between two electrodes of opposite polarity, the battery cell includes insulating elements that electrically insulate various conductive parts of the battery cell. This is particularly true of the battery cell cover, which ensures a watertight seal for the battery cell. A major challenge, therefore, lies in determining whether or not to electrically insulate the battery cell cover from the current collector(s) and from each terminal of the battery cell. In addition to its potential electrical insulation functions, such an insulating element must advantageously allow for gas venting and permit the relative positioning of the adjacent components, while also enabling the formation of a compact system suitable for insertion into the battery cell.Given the limited space remaining within the casing of a battery cell, the design of such an insulating element that meets all the aforementioned criteria remains imperfect.

[0009] Object of the invention

[0010] The present invention aims to provide a solution that addresses all or part of the aforementioned problems.

[0011] This goal can be achieved through the implementation of an electrical insulation element intended to be interposed between a current collector and a cover of a prismatic battery cell, said insulation element comprising a main body made of an electrically insulating material, the insulation element having a lower face intended to be turned towards the current collector, and an upper face intended to come into contact with the cover; the insulation element comprising on its upper face, raised positioning elements intended to cooperate by complementary shape with complementary elements delimited by the cover in such a way as to block a relative translation and a relative rotation between the insulation element and the cover; said positioning elements being offset along a longitudinal direction.

[0012] The arrangements described above make it possible to propose an insulation element whose shape complements that of the battery cell cover. This allows for a more compact system and a more reliable arrangement of the components constituting the prismatic battery cell.

[0013] By "in relief", it is understood that the positioning elements extend transversely to a general plane of elongation of the main body, for example by forming hollows, holes, bumps or protrusions.

[0014] The insulation element may also have one or more of the following characteristics, taken alone or in combination.

[0015] According to one embodiment, the positioning elements comprise a first raised positioning element extending in a first direction transversely to a plane of elongation of the main body, and a second raised positioning element extending in a second direction transversely to a plane of elongation of the main body, the second direction being opposite to the first. Thus, the positioning elements act as alignment guides to position the insulation element relative to the cover.

[0016] According to one embodiment, the positioning elements comprise a first positioning element and a second positioning element, the first positioning element being a peg protruding from the main body, and the second positioning element being a hole made in the main body.

[0017] Thus, the formation of the positioning elements is simple to implement and effectively fixes the relative movement of the insulating element with the cover. Furthermore, providing opposing reliefs for the first and second positioning elements creates positioning guide elements to ensure the insulating element is correctly oriented when it interacts with the current collector and the battery cell cover.

[0018] According to one embodiment, the second positioning element is a hole through the main body.

[0019] According to one embodiment, the pawl protrudes along an axis perpendicular to an extension plane of the main body.

[0020] In this way, the pin is able to block all translations of the cover relative to the insulation element in an extension plane of the main body.

[0021] According to one embodiment, the insulation element includes a through contact opening intended to allow the passage of a contact member through the main body of the insulation element, the positioning elements being arranged on either side of the contact opening.

[0022] The insulation element thus includes means for connecting the current collector with a terminal of the battery cell by passing through the insulation element.

[0023] According to one embodiment, the insulation element has a main length measured along the longitudinal direction, the positioning elements being offset from each other by a distance greater than or equal to half the main length.

[0024] Thus, the rotational locking of the insulation element with the cover is more robust.

[0025] According to one embodiment, the insulation element has a main width measured along a transverse direction perpendicular to the longitudinal direction, the positioning elements being substantially aligned along an axis parallel to the longitudinal direction and passing substantially through the middle of the main width.

[0026] In this way, the positioning elements are centered on the main body, which allows for maintaining homogeneity in the translational blocking between the cover and the insulation element.

[0027] According to one embodiment, the insulation element includes on its lower face, raised positioning members, intended to cooperate by complementarity of form with the current collector in a manner blocking a relative translation and a relative rotation between the current collector and the insulation element.

[0028] The insulating element is thus able to cooperate, through complementary shape, with the current collector. This makes it possible to propose a more compact system and to arrange the components constituting the prismatic battery cell in a more reliable manner.

[0029] According to one embodiment, the main body defines a hollow housing intended to receive a portion of the current collector, the positioning elements being arranged in the housing.

[0030] Thus, it is possible to propose an insulating element surrounding, at least partially, a portion of the current collector. This allows for proper positioning of the current collector relative to the insulating element, and therefore relative to the cover.

[0031] For example, the positioning devices protrude into the housing.

[0032] According to one embodiment, the positioning members comprise two shoulders arranged on opposite walls of the housing.

[0033] In this way, it is possible both to facilitate the positioning of the current collector and to keep it in position in the housing.

[0034] According to one embodiment, the two shoulders are arranged opposite each other.

[0035] Thus, the shoulders form a guide allowing the portion of the current collector to slide between the two shoulders.

[0036] According to one embodiment, the two shoulders and the pin belong to a plane perpendicular to the longitudinal direction.

[0037] The current collector is thus blocked in a direction perpendicular to that which prevents the cover from moving in translation. The stresses are therefore distributed within the insulating element.

[0038] For example, the two shoulders and the pawl are aligned along the transverse direction on either side of the main body.

[0039] According to one embodiment, the positioning members are intended to allow assembly of the current collector in the housing.

[0040] In this way, it is possible to change the position of the current collector if it is not correctly inserted into the housing. The presence of the positioning elements and their arrangement in the insulating element allow the current collector to remain in contact with the insulating element, which facilitates the assembly of the battery cell.

[0041] For example, the assembly of the current collector in the housing is a reversible assembly.

[0042] According to one embodiment, the contact opening passes through the housing.

[0043] Thus, direct access to the current collector is possible through the contact opening, particularly from the upper face of the insulating element. This allows the current collector to be connected to the battery cell terminal while it is housed within the compartment.

[0044] The object of the invention can also be achieved through the implementation of an assembly for a prismatic electric battery cell comprising: - an insulating element as described above; and - a cover intended to ensure closure of a battery cell casing, the cover comprising complementary elements cooperating with the positioning elements of the insulation element to block relative translation and relative rotation with the insulation element.

[0045] The arrangements described above make it possible to form an assembly ready to be associated with the electrode assemblies to form the prismatic battery cell.

[0046] According to one embodiment, the assembly further includes a current collector intended to be electrically connected to electrodes of the battery cell, the insulating element being interposed between the cover and the current collector, ensuring electrical insulation between the cover and the current collector.

[0047] The arrangements described above make it possible to propose a compact assembly comprising the current collector and the cover, while ensuring electrical insulation between the current collector and the cover.

[0048] The objective of the invention can also be achieved through the implementation of a prismatic battery cell for an electric propulsion vehicle, said battery cell comprising: - a case having a prismatic shape, the case having a top opening and internally delimiting a housing; - at least one electrode assembly disposed in the housing, and comprising the successive assembly of a sheet of a first electrode, a first insulating separator, a second electrode, and a second insulating separator; the first electrode and the second electrode each having a current-collecting tab protruding from the assembly and being configured to collect an electric current from that electrode; - an assembly such as described above, in which the cover provides a tight seal for the upper opening of the housing, and in which the current collector is electrically connected to the first electrode; and - a second current collector electrically connected to the second electrode.

[0049] The arrangements described above make it possible to propose a battery cell in which the electrical insulation element makes it possible both to electrically isolate the current collector from the cover, while facilitating the positioning of the current collector relative to the cover and allowing to form a compact assembly adjusted to the dimensions of the battery cell case.

[0050] Brief description of the drawings

[0051] Other aspects, objectives, advantages and features of the invention will become more apparent upon reading the following detailed description of preferred embodiments thereof, given by way of non-limiting example, and made with reference to the accompanying drawings in which:

[0052] [Fig-1] Fig. 1 is a schematic perspective view of an insulation element, according to one embodiment of the invention, viewed from the top face.

[0053] [Fig.2] Fig.2 is a bottom view of the insulating element of Fig.1, seen from the side of the underside.

[0054] [Fig. 3] [Fig. 3] is a schematic exploded view of an assembly comprising two insulation elements.

[0055] [Fig.4] Fig.4 is a schematic view of a battery cell comprising the whole of [Fig.3]. Detailed description

[0056] In the figures and throughout the description, the same reference numerals represent identical or similar elements. Furthermore, the various elements are not drawn to scale in order to enhance the clarity of the figures. Moreover, the different embodiments and variants are not mutually exclusive and may be combined.

[0057] As can be seen in Figures 1 and 2, the invention relates to an electrical insulation element 13 intended to be interposed between a current collector 10 and a cover 6 of a prismatic battery cell 1.

[0058] The insulation element 13 comprises a main body 40 made of an electrically insulating material, for example polypropylene. This main body 40 may have a general plate shape, for example a rectangular plate extending in a plane perpendicular to a lateral direction denoted "Z", corresponding to a direction of introduction of electrode assemblies 50 51, 53 into a housing 4 of the battery cell 1. The insulation element 13 may, for example, have a main length L13 measured along a longitudinal direction denoted "X" belonging to the elongation plane of the main body 40, and a main width wl3 measured along a transverse direction denoted "Y" perpendicular to the longitudinal direction X and to the lateral direction Z.As can be seen in Figures 1 and 2, the main length L13 is generally strictly greater than the main width wl3, so that the insulation element 13 has an elongated shape along the longitudinal direction X.

[0059] The insulation element 13 has a lower face fi 13 intended to be turned towards the current collector 10, and an upper face fs 13 intended to come into contact with the cover 6. [Fig.1] illustrates the insulation element 13 with the upper face fs 13 visible, while [Fig.2] illustrates a view of the lower face fil3.

[0060] The insulation element 13 includes on its upper face fs 13, positioning elements 41, 43 in relief intended to cooperate by complementarity of form with complementary elements delimited by the cover 6 in a way blocking a relative translation and a relative rotation between the insulation element 13 and the cover 6. By "in relief", it is understood that the positioning elements 41, 43 extend transversely to the general plane of elongation of the main body 40, for example by forming hollows, holes, bumps or protrusions.

[0061] Advantageously, the positioning elements 41, 43 may comprise a first raised positioning element 41 extending in a first direction transversely to a plane of elongation of the main body 40, and a second raised positioning element 43 extending in a second direction transversely to a plane of elongation of the main body 40, the second direction being opposite to the first. Thus, the positioning elements 41, 43 act as alignment guides for positioning the insulation element 13 relative to the cover 6. In other words, it is possible that the first positioning element 41 forms a positive relief projecting from the main body 40, like a bump, and that the second positioning element 43 forms a negative relief, recessed into the main body 40, like a hole; or vice versa.

[0062] For example, the first positioning element 41 can be a pin projecting from the main body 40, in particular projecting along an axis perpendicular to the extension plane of the main body 40. In this way, the pin is able to block all translations of the cover 6 relative to the insulation element 13 in the extension plane of the main body 40. The second positioning element 43 can be a hole, for example a through hole, provided in the main body 40. Thus, the formation of the positioning elements 41, 43 is simple to implement and makes it possible to effectively fix the relative movement of the insulation element 13 with the cover 6.Furthermore, proposing opposing reliefs for the first and second positioning elements 41, 43 makes it possible to create positioning keying elements to place the insulation element 13 in the correct direction when it cooperates with the current collector 10 and the cover 6 of the battery cell 1.

[0063] The positioning elements 41, 43 are offset from each other along the longitudinal direction X. More precisely, the positioning elements 41, 43 can be aligned along the longitudinal direction X, and generally by a distance greater than or equal to half the main length L13. Thus, the rotational locking of the insulation element 13 with the cover 6 is more robust.

[0064] Furthermore, the positioning elements 41, 43 can be substantially aligned along an axis parallel to or coinciding with the longitudinal direction X and passing substantially through the middle of the main width wl3. In this way, the positioning elements 41, 43 are centered on the main body 40, which makes it possible to maintain homogeneity in the translational locking between the cover 6 and the insulating element 13.

[0065] To allow the passage of a contact member 11, such as a rivet, through the insulating element 13, a through contact opening 45 may be provided through the main body 40 of the insulating element 13. This contact opening 45 may advantageously be generally circular in shape and centered in the middle of the main width wl3. The positioning elements 41, 43 may then be arranged on either side of the contact opening 45. The insulating element 13 thus includes means for connecting the current collector 10 with a terminal 2, 3 of the battery cell 1 by passing through the insulating element 13.

[0066] With reference now to [Fig. 2], the insulating element 13 may include on its lower face, 3, raised positioning members 47, designed to cooperate by complementary shape with the current collector 10 in such a way as to block relative translation and relative rotation between the current collector 10 and the insulating element 13. The positioning members 47 are therefore arranged on a face opposite to that on which the positioning elements 41, 43 are arranged. The presence of the positioning members 47 allows the insulating element 13 to cooperate by complementary form also with the current collector 10. This makes it possible to propose a more compact system and to arrange more reliably the components constituting the prismatic battery cell 1.

[0067] According to the variant shown in [Fig. 2], the main body 40 defines a recessed housing 49 for receiving a portion 20 of the current collector 10. This housing 49 may advantageously have a general shape complementary to the portion 20 of the current collector 10 to facilitate their cooperation. For example, the portion 20 of the current collector 10 may comprise a first part having a circular contour and a second part having a straight, rectangular contour. In this case, the housing 49 may comprise a primary cylindrical part and a secondary prismatic part configured to cooperate respectively with the first and second parts of the portion 20 of the current collector 10.

[0068] The positioning members 47 are generally arranged within the housing 49. Thus, it is possible to provide an insulating element 13 that at least partially surrounds the portion 20 of the current collector 10. This allows the current collector 10 to be correctly positioned relative to the insulating element 13, and therefore relative to the cover 6. For example, the positioning members 47 protrude inwards from the housing 49 and are arranged opposite each other. The variant shown in [Fig. 2] depicts the two positioning members 47 facing each other in the prismatic secondary portion of the housing 49. In this way, the positioning members 47 form a guide allowing the portion 20 of the current collector 10 to slide. These positioning members 47 may include two shoulders arranged on opposite walls of the housing 49.In this way, it is possible both to facilitate the positioning of the current collector 10 and to keep it in position in the housing 49.

[0069] Optionally, the positioning elements 47 can be designed to allow assembly, for example a reversible assembly, of the current collector 10 in the housing 49. In this way, it is possible to change the position of the current collector 10 if it is not correctly inserted into the housing 49. The presence of the positioning elements 47 and their arrangement in the insulating element 13 make it possible to keep the current collector 10 in contact with the insulating element 13, which facilitates the assembly operations of the battery cell 1.

[0070] It is possible that the two shoulders and the pin lie in a plane perpendicular to the longitudinal direction X. For example, the two shoulders and the pin are aligned along the transverse direction Y on either side of the main body 40. The current collector 10 is thus locked in a direction perpendicular to that which allows the cover 6 to be blocked in translation. The stresses are therefore distributed in the insulation element 13.

[0071] Finally, as can be seen in Figures 1 and 2, the contact opening 45 can pass through the housing 49, and in particular through the center of the cylindrical primary portion of the housing 49. It is therefore clear that the primary portion of the housing 49 is designed to allow the passage of the contact member 11 to make an electrical connection with a terminal 2, 3 of the battery cell 1, and that the secondary portion of the housing 49 is designed to allow positioning of the current collector 10 with the insulating element 13. Thus, it is possible to have direct access to the current collector 10 through the contact opening 45, and in particular from the upper face fs 13 of the insulating element 13. It is therefore possible to connect the current collector 10 to the terminal of the battery cell 1, while the latter is housed in the housing 49.

[0072] All the arrangements described above make it possible to propose an insulation element 13 having a complementary shape with the cover 6 of the battery cell 1 and with the current collector 10 of the battery cell. This makes it possible to propose a more compact system and to arrange the components constituting the prismatic battery cell 1 in a more reliable manner.

[0073] Figure 3 illustrates an assembly 5 for a prismatic electric battery cell 1, which is also the subject of the present invention. This assembly 5 comprises at least one insulation element 13 as described above, and the battery cell cover 6, intended to ensure a watertight seal of the battery cell casing 4. Figure 3 illustrates in particular an exploded view of an assembly 5 comprising two insulation elements 13 arranged on the side of each terminal of the battery cell 1.

[0074] The cover 6 includes complementary elements (not visible in the figure) which cooperate with the positioning elements 41, 43 of the insulation element 13 to block relative translation and relative rotation with the insulation element 13. This makes it possible to form an assembly 5 ready to be associated with the electrode assemblies 50 51, 53 to form the prismatic battery cell 1.

[0075] The assembly 5 generally further comprises a current collector 10 intended to be electrically connected to electrodes 51, 53 of the battery cell 1 on the one hand, and to a terminal 2, 3 of the battery cell on the other. The insulating element 13 is then interposed between the cover 6 and the current collector 10, ensuring electrical insulation between the cover 6 and the current collector 10. Figure 3 illustrates an assembly 5 comprising two current collectors 10, associated with each of the terminals, and therefore with each of the electrodes 51, 53 of the battery cell 1. The arrangements described above make it possible to propose a compact assembly 5. including the current collector 10 and the cover 6, while ensuring electrical insulation between the current collector 10 and the cover 6.

[0076] Finally, with reference to [Fig. 4], the invention also relates to a prismatic battery cell 1 for an electric propulsion vehicle. The battery cell 1 comprises a case 4 having a prismatic shape.

[0077] The housing 4 internally delimits a cell housing 9 and has a top opening 8 which provides access to this cell housing 9. The cell housing 9 can extend in the lateral direction Z.

[0078] The battery cell 1 also includes an assembly 5 as described above, in which the cover 6 provides a tight seal for the upper opening 8 of the housing 4. The battery cell 1 may include a first terminal 2 and a second terminal 3 of opposite polarity to the first terminal 2. Generally, the first terminal 2 and the second terminal 3 are two separate parts attached to the cover 6. For this reason, it is advantageous to provide spacers 15 interposed between each terminal 2, 3 and the cover 6.

[0079] The first current collector 10 of the assembly 5 is electrically connected to the first terminal 2 and the second current collector 10 of the assembly 5 is electrically connected to the second terminal 3. The electrical insulation conferred by the insulation elements 13 according to the invention makes it possible to avoid any short circuit between the current collectors 10 and the cover 6.

[0080] The battery cell 1 also includes at least one assembly 50 of electrodes 51, 53 comprising the successive assembly of first and second electrodes 51, 53 of opposite polarity and separated from each other by a porous separator film.

[0081] The first electrode 51 may, in particular, comprise a first metal foil in the form of a thin strip, on which a layer of a first active material is deposited. If the first electrode 51 is a cathode, the first metal foil may comprise aluminum. The second electrode 53 may comprise a second metal foil in the form of a thin strip, on which a layer of a second active material is deposited. If the second electrode 53 is an anode, the second metal foil may comprise copper.

[0082] The insulating separator(s) are arranged so that no electrical contact is possible between the first electrode 51 and the second electrode 53. The insulating separators also have a porous structure, allowing the passage of an electrolyte comprising ions responsible for the charge transfer between the first electrode 51 and the second electrode 53.

[0083] In the particular case of prismatic battery cells 1, the assemblies 50 generally comprise a stacking or winding of the layers as previously described, and in particular two stacks or windings, thus forming two separate assemblies 50 intended to be housed in a single housing 9.

[0084] The first and second electrodes 51, 53 each have a current-collecting tab 55 projecting from the assembly 50 and configured to collect an electric current from said electrode. The first current collector 10 can be electrically connected to the current-collecting tabs 55 of the first electrodes 51, and the second current collector 10 can be electrically connected to the current-collecting tabs 55 of the second electrodes 53. In order to facilitate current collection by the current collectors 10, it is advantageous for them to be formed from the same material as the electrode with which they are electrically connected.Thus, the first current collector 10 can include aluminum, and the second current collector 10 can include copper.

[0085] Advantageously, the battery cell may include an electrically insulating side element 7 interposed between the electrode assembly 50 51, 53 and the housing 4. In this way, the electrically insulating side element 7 makes it possible to electrically isolate the current collection tabs 55 from the housing 4 of the battery cell 1.

[0086] Furthermore, it is generally provided that the battery cell 1 includes a contact element 11, such as a rivet, which provides an electrical connection between each terminal 2, 3, and one of the current collectors 10. The contact opening 45 is intentionally provided in the insulation elements 13, to allow the passage of such a contact element 11.

[0087] Finally, in order to allow the exchange of ions between the first electrode 51 and the second electrode 53, the battery cell 1 generally includes a solid or liquid electrolyte.

[0088] The arrangements described above make it possible to propose a battery cell 1 in which the electrical insulation element 13 makes it possible both to electrically isolate the current collector 10 from the cover 6, while facilitating the positioning of the current collector 10 relative to the cover 6 and making it possible to form a compact assembly 5 adjusted to the dimensions of the housing 4 of the battery cell 1.

Claims

Demands

1. Electrical insulation element (13) intended to be interposed between a current collector (10) and a cover (6) of a prismatic battery cell (1), said insulation element (13) comprising a main body (40) of an electrically insulating material, the insulation element (13) having a lower face (f13) intended to be oriented towards the current collector (10), and an upper face (fs13) intended to come into contact with the cover (6); the insulation element (13) comprising on its upper face (fs13), raised positioning elements (41, 43) intended to cooperate by complementary shape with complementary elements delimited by the cover (6) in such a way as to block relative translation and relative rotation between the insulation element (13) and the cover (6); said positioning elements (41, 43) being offset along a longitudinal direction (X).

2. Insulation element (13) according to claim 1, wherein the positioning elements (41, 43) comprise a first positioning element (41) and a second positioning element (43), the first positioning element (41) being a pin projecting from the main body (40), and the second positioning element (43) being a hole provided in the main body (40).

3. Insulation element (13) according to claim 2, wherein the pin protrudes along an axis perpendicular to an extension plane of the main body (40).

4. Insulation element (13) according to any one of claims 1 to 3, comprising a through contact opening (45) for permitting the passage of a contact member (11) through the main body (40) of the insulation element (13), the positioning elements (41, 43) being arranged on either side of the contact opening (45).

5. Insulation element (13) according to any one of claims 1 to 4, wherein the insulation element (13) has a main length (L13) measured along the longitudinal direction (X), the positioning elements (41, 43) being offset from each other by a distance greater than or equal to half the main length (L13).

6. Insulation element (13) according to any one of claims 1 to 5, wherein the insulation element (13) has a main width (wl3) measured along a transverse direction (Y) perpendicular to the longitudinal direction (X), the positioning elements (41, 43) being substantially aligned along an axis parallel to the longitudinal direction (X) and passing substantially through the middle of the main width (wl3).

7. Insulation element (13) according to any one of claims 1 to 6, comprising on its lower face (fi 13), raised positioning members (47), intended to cooperate by complementarity of form with the current collector (10) in a manner blocking a relative translation and a relative rotation between the current collector (10) and the insulation element (13).

8. Insulation element (13) according to claim 7, wherein the main body (40) defines a recessed housing (49) intended to receive a portion (20) of the current collector (10), the positioning members (47) being disposed in the housing (49).

9. Insulation element (13) according to claim 8, wherein the positioning members (47) comprise two shoulders arranged on opposite walls of the housing (49).

10. Insulation element (13) according to claim 9, wherein the two shoulders are arranged opposite each other.

11. Insulation element (13) according to any one of claims 9 or 10, and according to any one of claims 2 or 3, wherein the two shoulders and the pin belong to a plane perpendicular to the longitudinal direction (X).

12. Insulation element (13) according to any one of claims 8 to 11, wherein the positioning members (47) are intended to allow assembly of the current collector (10) in the housing (49).

13. Insulation element (13) according to claim 4 and according to any one of claims 8 to 12, in which the contact opening (45) passes through the housing (49).

14. Assembly (5) for a prismatic electric battery cell (1) comprising: • an insulating element (13) according to any one of claims 1 to 13; and • a cover (6) intended to ensure closure of a housing (4) of the battery cell (1), the cover (6) comprising complementary elements cooperating with the positioning elements (41, 43) of the insulation element (13) to block relative translation and relative rotation with the insulation element (13).

15. Assembly (5) according to claim 14, further comprising a current collector (10) intended to be electrically connected to electrodes (51, 53) of the battery cell (1), the insulating element (13) being interposed between the cover (6) and the current collector (10), ensuring electrical insulation between the cover (6) and the current collector (10).

16. Prismatic battery cell (1) for an electric propulsion vehicle, said battery cell (1) comprising: • a casing (4) having a prismatic shape, the casing (4) having a top opening (8) and internally delimiting a casing housing (9) (4); • at least one electrode assembly (50) (51, 53) disposed in the casing housing (9), and comprising the successive assembly of a sheet of a first electrode (51), a first insulating separator, a second electrode (53), and a second insulating separator; the first electrode (51) and the second electrode (53) each having a current-collecting tab (55) projecting from the assembly (50) and being configured to collect an electric current from that electrode (51, 53);• an assembly (5) according to claim 15, in which the cover (6) provides a tight seal of the upper opening (8) of the housing (4), and in which the current collector (10) is electrically connected to the first electrode (51); and • a second current collector (10) electrically connected to the second electrode (53).

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