Traction battery crossbeam assemblies with heat management valve opening mechanism for controlled ventilation

Abstract

Battery cell stack crossbeam assemblies for traction battery packs are provided. An example crossbeam assembly may include a thermal insulation film to block the transfer of heat energy to adjacent structures within the traction battery pack. The thermal insulation film incorporates heat control valves in the form of releasable tabs to control the flow of battery cell venting byproducts during battery thermal events. A venting strap can secure the thermal insulation film to the crossbeam assembly and can act as an opening mechanism to control the release of the tabs.

Description

CROSS-REFERENCE TO RELATED REGISTRATIONS

[0001] This disclosure claims priority over preliminary US application No. 63 / 607,888, which was filed on December 8, 2023, and is incorporated in its entirety by reference into this document. AREA OF TECHNOLOGY

[0002] This disclosure relates generally to traction battery packs and in particular to crossbeam assemblies that include integrated heat management valves with controlled opening mechanisms for controlling a flow of battery cell venting by-products through the crossbeam assemblies. GENERAL STATE OF THE ART

[0003] Electrified vehicles include a traction battery pack to supply power to electric motors and other electrical components within the vehicle. The traction battery pack comprises a variety of battery cells and various other internal components that support the electric vehicle's propulsion system. SUMMARY

[0004] A traction battery pack according to an exemplary aspect of the present disclosure includes, among other things, a cell stack comprising a plurality of battery cells arranged between a first crossbeam assembly and a second crossbeam assembly. The first crossbeam assembly and the second crossbeam assembly each include a ladder frame, a thermal insulation film, and a venting strip securing the thermal insulation film to the ladder frame.

[0005] In a further non-restrictive embodiment of the preceding traction battery pack, the ladder frame is made of a thermoplastic material and includes a plurality of cell flat plug openings, each dimensioned to accommodate a connection of one or more of the plurality of battery cells.

[0006] In another non-restrictive embodiment of one of the preceding traction battery packs, the ladder frame includes a vent opening.

[0007] In a further non-restrictive embodiment of any of the preceding traction battery packs, the thermal insulation film includes a tab which, in response to a current of a battery cell venting by-product against the tab, can be released from a first position covering the vent opening to a second position exposing the vent opening.

[0008] In a further non-restrictive embodiment of any of the preceding traction battery packs, the tab is connected to a membrane of the thermal insulation film in a way that allows it to be released through the venting strip.

[0009] In a further non-restrictive embodiment of one of the preceding traction battery packs, the ladder frame includes a rung which is received through a mounting hole of the membrane in order to position the membrane relative to the ladder frame.

[0010] In a further non-restrictive embodiment of any of the preceding traction battery packs, the ladder frame includes a clamp which holds the membrane relative to the ladder frame.

[0011] In a further non-restrictive embodiment of any of the preceding traction battery packs, the venting band is configured to melt to release the tab when the temperature of the battery cell venting by-product exceeds a predefined temperature threshold.

[0012] In another non-restrictive embodiment of any of the preceding traction battery packs, the venting strip is a coated mica strip.

[0013] In a further non-restrictive embodiment of any of the preceding traction battery packs, a first pultruded reinforcement beam is attached to the ladder frame.

[0014] In a further non-restrictive embodiment of one of the preceding traction battery packs, a second pultruded reinforcement beam is attached to the ladder frame.

[0015] In a further non-restrictive embodiment of one of the preceding traction battery packs, the thermal insulation film includes a tab that serves to provide a heat control valve, and the venting strip serves to provide an opening mechanism for selectively releasing the tab from the thermal insulation film.

[0016] A traction battery pack according to another exemplary aspect of the present disclosure includes, among other things, a cell stack comprising a crossbeam assembly, wherein the crossbeam assembly includes a ladder frame, a thermal insulation film and a venting strip configured to secure the thermal insulation film to the ladder frame.

[0017] In a further non-restrictive embodiment of the preceding traction battery pack, a first reinforcement carrier is mounted on the ladder frame. The first reinforcement carrier forms a pultruded part of the crossbeam assembly.

[0018] In another non-restrictive embodiment of one of the preceding traction battery packs, the venting strip is a coated mica strip.

[0019] In a further non-restrictive embodiment of one of the preceding traction battery packs, the vent band is configured to provide an opening mechanism for selectively releasing a tab from the thermal insulation film.

[0020] In a further non-restrictive embodiment of any of the aforementioned traction battery packs, the vent band is configured to provide the opening mechanism when the temperature of a battery cell venting by-product exceeds a predefined temperature threshold.

[0021] In a further non-restrictive embodiment of any of the aforementioned traction battery packs, the venting strap secures the tab in place in a releasable manner to cover a vent opening of the ladder frame.

[0022] In a further non-restrictive embodiment of any of the preceding traction battery packs, the ladder frame includes a rung which is received through a mounting hole of a membrane of the thermal insulation film in order to position the membrane relative to the ladder frame.

[0023] In a further non-restrictive embodiment of any of the preceding traction battery packs, the conductor frame includes a clamp that engages in a notch of a membrane of the thermal insulation film to secure the membrane relative to the conductor frame.

[0024] The embodiments, examples, and alternatives described in the preceding paragraphs, the claims, or the following description and drawings, including their various aspects or individual features, may be used independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, provided such features are not incompatible.

[0025] The various features and advantages of this disclosure will become apparent to the person skilled in the art from the following detailed description. The drawings accompanying the detailed description can be summarized as follows. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 schematically illustrates an electrified vehicle. Fig. Figure 2 is a stretched perspective view of a traction battery pack for an electrified vehicle. Fig. Figure 3 illustrates an example cell stack of the traction battery pack from Fig. 2. Fig. 4 is a split partial view of the cell stack from Fig. 3. Fig. Figure 5 illustrates a thermal insulation film of a crossbeam assembly during normal battery operating conditions. Fig. Figure 6 is a cross-sectional view through section 6-6 from Fig. 5. Fig. Figure 7 illustrates the thermal insulation film made of Fig. 5 during a battery thermal event. Fig. Figure 8 illustrates another exemplary crossbeam assembly that includes a thermal insulation film. DETAILED DESCRIPTION

[0026] This disclosure describes battery cell crossbeam assemblies for traction battery packs. An exemplary crossbeam assembly may include a thermal insulation film to block the transfer of heat energy to adjacent structures within the traction battery pack. The thermal insulation film has integrated heat control valves in the form of releasable tabs for controlling the flow of battery cell venting byproducts during battery thermal events. A venting strap may secure the thermal insulation film to the crossbeam assembly and may act as an opening mechanism to control the release of the tabs. These and other features are discussed in more detail in the following paragraphs of this detailed description.

[0027] Fig. Figure 1 schematically illustrates an electrified vehicle 10. The electrified vehicle 10 can include any type of electrified powertrain. In one embodiment, the electrified vehicle 10 is a battery electric vehicle (BEV). However, the concepts described in this document are not limited to BEVs and could extend to other electrified vehicles, including, but not limited to, hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles, etc. Therefore, although not specifically shown in the exemplary embodiment, the powertrain of the electrified vehicle 10 could be equipped with an internal combustion engine, which can be used either alone or in combination with other power sources to propel the electrified vehicle 10.

[0028] In the illustrated embodiment, the electrified vehicle 10 is depicted as an automobile. However, the electrified vehicle 10 could alternatively be a sport utility vehicle (SUV), a van, a pickup truck, or any other vehicle configuration. Although the figures in this disclosure illustrate a specific relationship between the components, these illustrations are not intended to limit the scope of this disclosure. The placement and orientation of the various components of the electrified vehicle 10 are shown schematically and could vary within the scope of this disclosure. Furthermore, the various figures accompanying this disclosure are not necessarily drawn to scale, and some features may be enlarged or reduced to highlight certain details of a particular component, assembly, or system.

[0029] In the illustrated embodiment, the electrified vehicle 10 is a fully electric vehicle powered exclusively by electrical power, such as from one or more electric machines 12, without assistance from an internal combustion engine. The electric machine 12 can operate as an electric motor, an electric generator, or both. The electric machine 12 receives electrical power and can convert this power into torque to drive one or more wheels 14 of the electrified vehicle 10.

[0030] A voltage bus 16 can electrically couple the electric machine 12 to a traction battery pack 18. The traction battery pack 18 is an exemplary battery of an electrified vehicle. The traction battery pack 18 can be a high-voltage traction battery pack assembly comprising a variety of battery cells capable of outputting electrical power to supply the electric machine 12 and / or other electrical consumers of the electrified vehicle 10. Alternatively or additionally, other types of energy storage devices and / or output devices could also be used to supply the electrified vehicle 10 with electrical power.

[0031] The traction battery pack 18 can be secured to an underbody 20 of the electrified vehicle 10. However, within the scope of this disclosure, the traction battery pack 18 could be located at another location on the electrified vehicle 10.

[0032] Fig. Figure 2 illustrates additional details relating to the traction battery pack 18 of the electrified vehicle 10. Fig. 1 are assigned. The traction battery pack 18 can contain a plurality of cell stacks 22, which are housed within an internal compartment 30 of an enclosure assembly 24. The enclosure assembly 24 of the traction battery pack 18 can include an enclosure cover 26 and an enclosure shell 28. The enclosure cover 26 can be attached to the enclosure base 28 (e.g., screwed, welded, glued, etc.) to provide the internal compartment 30 for housing the cell stacks 22 and other battery-internal components of the traction battery pack 18.

[0033] Each cell stack 22 can contain a plurality of battery cells 32. The battery cells 32 of each cell stack 22 can be stacked together and arranged along a cell stack axis A. The battery cells 32 store and deliver electrical power to supply various components of the electrified vehicle 10. Although a specific number of cell stacks 22 and battery cells 32 is illustrated in the various figures of this disclosure, the traction battery pack 18 could contain any number of cell stacks 22, with each cell stack 22 containing any number of individual battery cells 32.

[0034] In one embodiment, the battery cells 32 are lithium-ion pouch cells. However, within the scope of this disclosure, alternatively, battery cells with other geometries (cylindrical, prismatic, etc.) and / or chemical compositions (nickel-metal hydride, lead-acid, etc.) could be used. The battery cells 32 can each include flat connector terminals projecting outwards from a battery cell housing. The flat connector terminals of the battery cells 32 of each cell stack 22 are interconnected, for example by one or more busbars, to provide the voltage and power levels necessary to achieve an electric vehicle drive.

[0035] One or more thermal barrier assemblies 34 can be arranged along the respective cell stack axis A of each cell stack 22. The thermal barrier assemblies 34 can divide each cell stack 22 into two or more groupings or compartments of battery cells 32. Each compartment can hold one or more of the battery cells 32 of the cell stack 22.

[0036] The battery cells 32 of the cell stack 22 can be arranged between a pair of crossbeam assemblies 38. Among other functions, the crossbeam assemblies 38 can be configured to hold the battery cells 32 and to at least partially separate the cell stacks 22 from each other within the interior area 30 of the enclosure assembly 24.

[0037] Each crossbeam assembly 38 can, for example, be configured to transfer a load applied to one side of the electrified vehicle 10 to ensure that the battery cells 32 are not excessively compressed. Each crossbeam assembly 38 can further be configured to accommodate tensile loads resulting from the expansion and contraction of the battery cells 32. The crossbeam assemblies 38 described in this document are therefore configured to enhance the structural integrity of the traction battery pack 18.

[0038] A vertically upper side of each cell stack 22 can form an interface with the encapsulation cover 26 and a vertically lower side of each cell stack 22 can form an interface with a heat exchanger plate 40 positioned on a base of the encapsulation shell 28 (see Fig. 2) In another embodiment, the heat exchanger plate 40 could be omitted, and the vertically lower side of each battery stack 22 could be in direct contact with the base of the casing shell 28. Vertical and horizontal, within the scope of this disclosure, refer to a general orientation of the traction battery pack 18 on the ground when it is installed in the electrified vehicle 10. Fig. 1 is built in.

[0039] The crossbeam assemblies 38 can be bonded to the casing cover 26 and either to the heat exchanger plate 40 or the casing shell 28 to seal the interfaces between these adjacent components and to structurally integrate the traction battery pack 18.

[0040] The cell stack 22 can be arranged to extend along its respective cell stack axes A between opposing end plates 42 of the traction battery pack 18. One or more end plates 42 can be positioned between the end of each cell stack 22 and a longitudinally extending side wall 44 of the enclosure shell 28. The end plates 42 can therefore extend along axes that are substantially transverse (e.g., perpendicular) to the cell stack axes A of the cell stacks 22 and the crossbeam assemblies 38. In some embodiments, the end plates 42 are structural elements that span a large portion of the length of the longitudinally extending side wall 44 of the enclosure shell 28 (see Fig. 2) However, other configurations are also conceivable within the scope of the present disclosure.

[0041] Fig. 3 and Fig. 4 illustrate with continued reference to Fig. 2 one of the cell stacks 22 of the traction battery pack 18. The additional cell stacks 22 of the traction battery pack 18 could have an essentially similar design to that in Fig. 3-4 are included.

[0042] Each crossbeam assembly 38 can include a ladder frame 46 and one or more reinforcement sections. In the illustrated embodiment, the crossbeam assembly 38 includes an upper or first reinforcement beam 48 and a lower or second reinforcement beam 50. However, other configurations are also considered within the scope of this disclosure.

[0043] The ladder frame 46 can be either a single-piece or a multi-part injection-molded construction. The ladder frame 46 can be made from any suitable thermoplastic material.

[0044] The ladder frame 46 can have one or more ventilation openings 52 (see Fig. 4) to guide battery cell venting byproducts released by one or more battery cells 32 over the conductor frame 46 and into a passage located between adjacent cell stacks 22. The vent openings 52 can therefore provide a path for battery cell venting byproducts to move through the crossbeam assembly 38, as may be necessary, for example, during a cell venting event of one or more of the battery cells 32 of the cell stack 22.

[0045] The conductor frame 46 can additionally have a large number of cell flat connector openings 54 (see Fig. 4) include, which are arranged vertically below the vent openings 52. The cell terminal openings 54 can be elongated slots configured to accommodate cell terminals of the battery cells 32. In one embodiment, each cell terminal opening 54 can accommodate one cell terminal. In another embodiment, each cell terminal opening 54 can be dimensioned to accommodate cell terminals from several adjacent battery cells 32 of the cell stack 22.

[0046] In an assembled state of the crossbeam assembly 38, both the vent openings 52 and the cell flat connector openings 54 are located between the first and second reinforcement beams 48, 50. However, other configurations are possible within the scope of this disclosure.

[0047] The first reinforcement beam 48 and the second reinforcement beam 50 can be mounted at separate locations on the ladder frame 46 to structurally reinforce the crossbeam assembly 38. The ladder frame 46 and the first and second reinforcement beams 48, 50 can include interlocking features that facilitate the connection of the first and second reinforcement beams 48, 50 to the ladder frame 46. For example, the ladder frame 46 can include first engagement features configured to engage or interlock with a second engagement feature of the first reinforcement beam 48 or the second reinforcement beam 50. In one embodiment, the first engagement features each include a first arrangement of fingers and slots, and the second engagement features each include a second arrangement of fingers and slots.The fingers of the first engagement features can be received in the slots of the second engagement features, and vice versa, to mount the first and second reinforcement carriers 48, 50 to the conductor frame 46. Although not shown, an adhesive could be applied between the first and second engagement features to further facilitate the connection of the first and second reinforcement carriers 48, 50 to the conductor frame 46.

[0048] In one embodiment, the first and second reinforcing members 48 and 50 are pultruded parts, implying a structure of these beam-like structures. A person skilled in the art, having the benefit of the present disclosure, would understand how to structurally distinguish a pultruded beam structure from another structure, such as an extruded beam.

[0049] The first and second reinforcement carriers 48, 50 can be manufactured as part of a pultrusion process that utilizes a glass or carbon fiber (unidirectional or multidirectional mat) and a thermosetting resin. A variety of glass or carbon fiber strands can be drawn through the thermosetting resin as part of the pultrusion process to manufacture the first and second reinforcement carriers 48, 50.

[0050] When mounted on the ladder frame 46, the first reinforcement beam 48 can form an upper plateau 68 of the crossbeam assembly 38, and the second reinforcement beam 50 can form a lower base 70 of the crossbeam assembly 38. An adhesive 72 can be applied to the upper plateau 68 and the lower base 70 to secure the crossbeam assembly 38 directly to the encasing cover 26 and either to the heat exchanger plate 40 or the encasing shell 28. Each cell stack 22 can therefore be structurally integrated into the encasing assembly 24 of the traction battery pack 18 via the crossbeam assemblies 38.

[0051] Each end of the ladder frame 46 can include one or more fastener housings 74, each dimensioned to receive a fastener insert 76. Each fastener insert 76 can be made of a metallic material (e.g., steel, brass, aluminum, etc.) and can be accommodated within an opening provided by the fastener housing 74. In one embodiment, the fastener housings 74 are integrally formed (e.g., molded) features of the ladder frame 46. The first reinforcement member 48 and the second reinforcement member 50 can be shaped accordingly to accommodate the fastener housings 74.

[0052] Each fastener insert 76 can include a fastener opening 80 configured to receive a fastener (e.g., a bolt or screw, not shown) for mounting the crossbeam assembly 38, and thus an associated cell stack 22, to an adjacent structure, such as one of the end plates 42. The fastener can pass through the end plate 42 and then be inserted into the fastener opening 80 of the fastener insert 76 to mount the cell stack 22 to the end plate 42. This connection can help to contain tensile loads that may occur, for example, as a result of battery cell expansion forces over the lifetime of the cell stack 22.

[0053] A thermal insulation film 82 can be connected to the conductor frame 46 of each crossbeam assembly 38 to limit the transfer of thermal energy from the cell stack 22 to an adjacent structure, such as another cell stack, thereby limiting the extent to which battery cell venting byproducts and their associated heat affect the structural integrity of the traction battery pack 18 during battery thermal events. The thermal insulation film 82 can be either a single unit or a multi-piece structure made of a flame-retardant and thermally insulating material. In one embodiment, the thermal insulation film 82 is a mica film. However, the thermal insulation film 82 could be made of aerogel materials, refractory ceramic fibers, or other materials or combinations of materials capable of providing flame-retardant and thermally insulating properties.

[0054] The thermal insulation film 82 can include a membrane 84 and a plurality of tabs 86, each of which is removably connected to the membrane 84. The membrane 84 can be positioned and held by a plurality of stanchions 88, a plurality of clamps 90, or both, relative to the conductor frame 46. The stanchions 88 and the clamps 90 can be integral features of the conductor frame 46. In one embodiment, the stanchions 88 and the clamps 90 can be formed by subsections 92 (see Figure 1). Fig. 4) of the conductor frame 46, which extend between adjacent pairs of the cell flat connector openings 54, project outwards. In another embodiment, the clamps 90 are provided at a location on the subsections 92 that is vertically below the stanchions 88. However, other configurations are also conceivable within the scope of this disclosure.

[0055] The stanchions 88 can be received via mounting holes 99 pre-formed by the membrane 84 to position the membrane 84 on the ladder frame 46. The heads of the stanchions 88 can then be deformed, for example by hot riveting or cold forming, to mount the membrane 84 to the ladder frame 46. The clamps 90 can engage in notches 97 formed in the membrane 84 to secure the membrane 84 to the ladder frame 46.

[0056] Now mainly with reference to Fig. 5, Fig. 6 and Fig. 7. A venting strip 94 can be used to secure the thermal insulation film 82 to the conductor frame 46 of the crossbeam assembly 38. The venting strip 94 can be applied to a back side 56 of the thermal insulation film 82. The back side 56 faces the conductor frame 46.

[0057] The venting strip 94 can additionally secure the tabs 86 in a way that allows them to be released relative to the membrane 84 of the thermal insulation film 82. Therefore, in at least some implementations, it is not necessary to connect the tabs 86 directly to the membrane 84 by means of bridges, joints, or the like.

[0058] In one embodiment, the venting tape 94 is a coated mica tape. In another embodiment, the venting tape 94 is a multilayer tape that may include an outer thermal insulation layer and an acrylic-based adhesive. The venting tape 94 may be able to withstand temperatures of up to approximately 150°C. However, other types of venting tapes may also be used within the scope of this disclosure.

[0059] Fig. 5 and Fig. Figure 6 illustrates the thermal insulation film 82 of the crossbeam assembly 38 during normal operating conditions of the traction battery pack 18 and Fig. Figure 7 schematically illustrates the thermal insulation film 82 during a battery heating event of the traction battery pack 18. During normal operating conditions of the traction battery pack 18, as schematically shown in Figure 7, the thermal insulation film 82 is exposed during normal operation of the traction battery pack 18. Fig. As shown in Figures 5-6, the membrane 84 is positioned to substantially cover the cell flat connector openings 54 of the conductor frame 46, and the tabs 86 are positioned to substantially cover the vent openings 52 of the conductor frame 46. The thermal insulation film 82 is therefore configured to block the transfer of heat energy from the cell stack 22 to an adjacent cell stack or other battery-internal structure of the traction battery pack 18.

[0060] During a battery thermal event, as schematically shown in Fig. As shown in Figure 7, one or more of the battery cells 32 of the cell stack 22 can rupture and release battery cell venting byproducts V. The battery cell venting byproducts V can flow through one of the vent openings 52 and then against the back side of the vent strip 94. When a stream of battery cell venting byproducts V moves against the back side of the vent strip 94, a temperature associated with the battery cell venting byproducts V can exceed a predefined temperature threshold, causing the vent strip 94 to melt and thus allowing the associated tab 86 relative to the membrane 84 to be released. This shifts the tab 86 to allow the stream of battery cell venting byproducts V to pass through an exposed opening 100 in the thermal insulation film 82.

[0061] The tabs 86 are therefore configured to function as heat control valves, and the vent band 94 is configured to function as an opening mechanism for the selective release of the tabs 86 during battery heating events. A controlled flow of the battery cell venting byproducts V can therefore be formed via the crossbeam assembly 38 during battery heating events of the traction battery pack 18.

[0062] Although in Fig. 7 where only a single tab 86 is shown which is released to provide controlled venting, an average person skilled in the art, having the benefit of the present disclosure, would recognize that, depending on how many battery cells 32 of the cell stack 22 are vented at any given time, more than one of the tabs 86 could be released from the thermal insulation layer 82.

[0063] During the battery heating event, the battery cell venting byproducts V initially move in a first direction D1 towards the vent strip 94. After contacting the back of the vent strip 94, melting sections of the vent strip 94, and passing through the exposed opening 100 created by the release of the tab 86, the battery cell venting byproducts V can be redirected to flow in a second direction D2, different from the first direction D1. Battery cell venting byproducts V moving in the second direction D2, in this example, move towards a tab 86B adjacent to the one released by the remaining sections of the heat-insulating film 82.The kinetic forces associated with the battery cell venting by-products V may be sufficient to keep the tab 86B in the closed position relative to the membrane 84, thus preventing the battery cell venting by-products V from entering the cell stack 22.

[0064] In some embodiments, a foam layer 96 (see e.g. Fig. 8) between the ladder frame 46 of the crossbeam assembly 38 and the vent strip 94. The foam layer 96 can, for example, be configured to provide additional thermal insulation between battery cells 32 located in adjacent cell packs of the cell stack 22.

[0065] The exemplary crossbeam assemblies of the present disclosure include a thermal insulation film for blocking the transfer of heat energy from cell stack to cell stack within a traction battery pack. The thermal insulation film has integrated heat control valves in the form of releasable tabs for controlling the flow of battery cell venting byproducts during battery thermal events. A venting band can act as an opening mechanism for releasing the tabs and allowing the venting byproducts to flow through the crossbeam assembly.

[0066] Although the different non-restrictive embodiments are illustrated by showing specific components or steps, the embodiments of the present disclosure are not limited to these specific combinations. It is possible to use some of the components or features from any of the non-restrictive embodiments in combination with features or components from any of the other non-restrictive embodiments.

[0067] It is understood that identical reference numerals denote corresponding or similar elements in the multiple views. It is understood that although a specific component arrangement is disclosed and illustrated in these exemplary embodiments, other arrangements could also benefit from the teachings of this disclosure.

[0068] The foregoing description should be interpreted as illustrative and not as limiting. A person skilled in the art will understand that certain modifications could fall within the scope of this disclosure. For these reasons, the following patent claims should be read carefully to determine the true scope and content of this disclosure. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 607,888

[0001]

Claims

[1] Traction battery pack, comprising: a cell stack comprising a plurality of battery cells arranged between a first crossbeam assembly and a second crossbeam assembly; and wherein the first crossbeam assembly and the second crossbeam assembly each include a ladder frame, a thermal insulation film and a venting strip that secures the thermal insulation film to the ladder frame. [2] Traction battery pack according to claim 1, wherein the conductor frame is made of a thermoplastic material and includes a plurality of cell flat plug openings, each dimensioned to accommodate a connection of one or more of the plurality of battery cells. [3] Traction battery pack according to claim 1 or 2, wherein the conductor frame includes a vent opening and wherein the thermal insulation film optionally includes a tab which, in response to a current of a battery cell venting by-product against the tab, can be released from a first position covering the vent opening to a second position exposing the vent opening. [4] Traction battery pack according to claim 3, wherein the tab is connected to a membrane of the thermal insulation film in a manner that can be released by the venting band. [5] Traction battery pack according to claim 4, wherein the ladder frame includes a stanchion which is received through a mounting hole of the membrane in order to position the membrane in relation to the ladder frame, and / or the ladder frame includes a clamp which holds the membrane in relation to the ladder frame. [6] Traction battery pack according to claim 4, wherein the venting band is configured to melt to release the tab when the temperature of the battery cell venting by-product exceeds a predefined temperature threshold. [7] Traction battery pack according to one of the preceding claims, wherein the venting band is a coated mica band. [8] Traction battery pack according to any of the preceding claims, comprising a first pultruded reinforcement carrier attached to the ladder frame and optionally comprising a second pultruded reinforcement carrier attached to the ladder frame. [9] Traction battery pack according to any of the preceding claims, wherein the thermal insulation film includes a tab that functions to provide a heat control valve and the venting strip functions to provide an opening mechanism for selectively releasing the tab from the thermal insulation film. [10] Traction battery pack, comprising: a cell stack comprising a crossbeam assembly, wherein the crossbeam assembly includes the following: a ladder frame; a thermal insulation film; and a venting strip configured to secure the thermal insulation foil to the conductor frame. [11] Traction battery pack according to claim 10, comprising a first reinforcement carrier mounted on the ladder frame, wherein the first reinforcement carrier forms a pultruded part of the cross member assembly. [12] Traction battery pack according to claim 10 or 11, wherein the venting band is a coated mica band. [13] Traction battery pack according to any one of claims 10 to 12, wherein the venting band is configured to provide an opening mechanism for selectively releasing a tab from the thermal insulation film, and wherein the venting band is optionally configured to provide the opening mechanism when the temperature of a battery cell venting by-product exceeds a predefined temperature threshold, and the venting band secures the tab in place in a releasable manner to cover a vent opening of the conductor frame. [14] Traction battery pack according to one of claims 10 to 13, wherein the ladder frame includes a stanchion which is received through a mounting hole of a membrane of the thermal insulation film in order to position the membrane with respect to the ladder frame. [15] Traction battery pack according to any one of claims 10 to 14, wherein the conductor frame includes a clamp which engages in a notch of a membrane of the thermal insulation film to secure the membrane relative to the conductor frame.

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