CN116805744A - Traction battery pack retention assembly with cell-pack battery system - Google Patents

Traction battery pack retention assembly with cell-pack battery system Download PDF

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Publication number
CN116805744A
CN116805744A CN202310223671.3A CN202310223671A CN116805744A CN 116805744 A CN116805744 A CN 116805744A CN 202310223671 A CN202310223671 A CN 202310223671A CN 116805744 A CN116805744 A CN 116805744A
Authority
CN
China
Prior art keywords
cell
battery pack
traction battery
retention assembly
pocket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310223671.3A
Other languages
Chinese (zh)
Inventor
J·张
帕特里克·丹尼尔·马圭尔
穆罕默德雷萨·埃夫特哈里
贾森·C·马尔卡思
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Ford Global Technologies LLC
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Ford Global Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/851,571 external-priority patent/US20230307768A1/en
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Publication of CN116805744A publication Critical patent/CN116805744A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/256—Carrying devices, e.g. belts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present disclosure provides a "retention assembly for a traction battery pack having a battery cell-pack battery system". A retention assembly for retaining a battery cell stack/matrix relative to a housing tray on a traction battery pack including a cell-pack battery system is disclosed. The retention assembly may be positioned between the cell stack/cell matrix and the inner surface of the housing tray. The retention assembly may include features such as slider panels, clips, adhesives, and/or shims designed to hold the stack down at the stack-housing tray interface.

Description

Traction battery pack retention assembly with cell-pack battery system
Cross Reference to Related Applications
This disclosure claims priority from U.S. provisional application No. 63/322,766, filed on day 23 of 3.2022, which is incorporated herein by reference.
Technical Field
The present disclosure relates generally to traction battery packs and, more particularly, to a retention assembly for retaining a cell stack or a cell matrix relative to a housing tray on a traction battery pack including a cell-to-battery pack battery system.
Background
An electrically powered vehicle includes a powertrain having one or more electric machines. Alternatively or in addition to the internal combustion engine, the electric machine may drive an electrically powered vehicle. The traction battery pack may power the motor and other electrical loads of the vehicle.
Conventional traction battery packs include a battery cell stack called a battery array. The battery array includes various array support structures (e.g., array frames, spacers, stringers, walls, end plates, ties, etc.) arranged to group and support battery cells in a plurality of individual cells within a traction battery pack housing.
Disclosure of Invention
Traction battery packs according to exemplary aspects of the present disclosure include, among other things: a housing assembly including a housing tray; and a battery cell-battery pack battery system housed within the housing assembly. The cell-battery pack system includes a cell stack and a retention assembly. The retention assembly includes a slider panel that establishes an interface between the cell stack and a side wall of the housing tray.
In another non-limiting embodiment of the aforementioned traction battery pack, the slider panel is secured to the battery cells at the longitudinal extent of the cell stack.
In another non-limiting embodiment of any of the foregoing traction battery packs, the cell stack establishes a cell row of a cell matrix of the cell-battery pack battery system.
In another non-limiting embodiment of any of the foregoing traction battery packs, the housing tray provides a cell compression opening for compressing the cell matrix.
In another non-limiting embodiment of any of the foregoing traction battery packs, the retaining assembly further comprises a clip received within the pocket of the slider panel.
In another non-limiting embodiment of any of the foregoing traction battery packs, the clip includes a first leg that interfaces with the slider panel and a second leg that interfaces with a side wall of the housing tray.
In another non-limiting embodiment of any of the foregoing traction battery packs, the first leg includes a hooked portion that engages a lip disposed within a pocket of the slider panel.
In another non-limiting embodiment of any of the foregoing traction battery packs, the second leg includes a retaining flange that engages a lip of the sidewall and a tab that engages an inner surface of the sidewall.
In another non-limiting embodiment of any of the foregoing traction battery packs, the retention assembly further includes a clip received in the pocket of the slider panel and a spacer received in the slot of the clip.
In another non-limiting embodiment of any of the foregoing traction battery packs, the retaining assembly further comprises a structural adhesive received within the pocket of the slider panel.
In another non-limiting embodiment of any of the foregoing traction battery packs, the inner surfaces of the side walls of the pocket, the floor of the pocket, and the side walls of the housing tray establish a containment perimeter around the structural adhesive.
In another non-limiting embodiment of any of the foregoing traction battery packs, at least one of the side walls or bottom plate includes a ribbed surface.
A traction battery pack according to another exemplary aspect of the present disclosure includes, among other things: a housing assembly including a housing cover and a housing tray; and a cell-battery pack battery system housed within the housing assembly and including a cell matrix and a retention assembly. The retention assembly includes a slider panel that establishes an interface between the cell matrix and the side walls of the housing tray.
In another non-limiting embodiment of the aforementioned traction battery pack, the cell matrix includes a plurality of cell stacks.
In another non-limiting embodiment of any of the foregoing traction battery packs, the retaining assembly further comprises a clip received within the pocket of the slider panel.
In another non-limiting embodiment of any of the foregoing traction battery packs, the clip includes a first leg that interfaces with the slider panel and a second leg that interfaces with a side wall of the housing tray.
In another non-limiting embodiment of any of the foregoing traction battery packs, the first leg includes a hooked portion that engages a lip disposed within a pocket of the slider panel. The second leg includes a retaining flange that engages the lip of the sidewall and a tab that engages the inner surface of the sidewall.
In another non-limiting embodiment of any of the foregoing traction battery packs, the retention assembly further includes a clip received in the pocket of the slider panel and a spacer received in the slot of the clip.
In another non-limiting embodiment of any of the foregoing traction battery packs, the retaining assembly further comprises a structural adhesive received within the pocket of the slider panel.
In another non-limiting embodiment of any of the foregoing traction battery packs, the pockets include a ribbed surface.
The embodiments, examples and alternatives of the foregoing paragraphs, claims or the following description and drawings (including any of their various aspects or respective individual features) may be employed independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments unless such features are incompatible.
Various features and advantages of this disclosure will become apparent to those skilled in the art from the following detailed description. The drawings that accompany the detailed description can be briefly described as follows.
Drawings
Fig. 1 schematically shows an electrically powered vehicle.
Fig. 2 shows a traction battery pack of the motorized vehicle of fig. 1.
Fig. 3 illustrates a cell-pack battery system of the traction battery pack of fig. 2.
Fig. 4 is a partially exploded view of a traction battery pack having a battery cell-pack battery system.
Fig. 5 illustrates a retention assembly of the battery cell-battery pack system of fig. 4.
Fig. 6 is an exploded view of the retention assembly of fig. 5.
Fig. 7 is a cross-sectional view through section 7-7 of fig. 4.
Fig. 8 illustrates the interface between the retention assembly and the housing tray of the battery cell-pack battery system.
Fig. 9 illustrates another exemplary retention assembly of a battery cell-battery pack battery system.
Fig. 10 illustrates yet another exemplary retention assembly for a battery cell-to-battery pack battery system.
Fig. 11 illustrates an adhesive filled area established by the retention assembly of fig. 10.
FIG. 12 illustrates an exemplary slider panel of the retention assembly of FIG. 10.
Detailed Description
The present disclosure details a retention assembly for retaining a battery cell stack/matrix relative to a housing tray on a traction battery pack including a cell-pack battery system. The retention assembly may be positioned between the cell stack/cell matrix and the inner surface of the housing tray. The retention assembly may include features such as slider panels, clips, adhesives, and/or shims designed to hold the stack down at the stack-housing tray interface. These and other features are discussed in more detail in the following paragraphs of this detailed description.
Fig. 1 schematically illustrates an electrically powered vehicle 10. The motorized vehicle 10 may include any type of motorized driveline. In an embodiment, the motorized vehicle 10 is a Battery Electric Vehicle (BEV). However, the concepts described herein are not limited to BEVs and are extendable to other motorized vehicles, including, but not limited to, hybrid Electric Vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles, and the like. Thus, although not specifically shown in the exemplary embodiment, the motorized vehicle 10 may be equipped with an internal combustion engine that may be employed alone or in combination with other power sources to propel the motorized vehicle 10.
In an embodiment, the motorized vehicle 10 is an automobile. However, motorized vehicle 10 may alternatively be a pick-up truck, van, sport Utility Vehicle (SUV), or any other vehicle configuration. Although specific component relationships are shown in the drawings of the present disclosure, the illustrations are not intended to limit the disclosure. The layout and orientation of the various components of the motorized vehicle 10 are schematically illustrated and may vary within the scope of the present disclosure. Furthermore, the various figures attached to this disclosure are not necessarily drawn to scale, and some features may be exaggerated or minimized to emphasize certain details of particular components or systems.
In the illustrated embodiment, the motorized vehicle 10 is a pure electric vehicle propelled solely by electric power (such as by one or more electric machines 12) without the assistance of an internal combustion engine. The electric machine 12 may act as an electric motor, a generator, or both. The electric machine 12 receives electrical power and may convert the electrical power into torque for driving one or more drive wheels 14 of the motorized vehicle 10.
The voltage bus 16 may electrically couple the motor 12 to a traction battery pack 18. Traction battery pack 18 is capable of outputting electrical power to power motor 12 and/or other electrical loads of electric vehicle 10.
The traction battery pack 18 may be secured to an underbody 22 of the motorized vehicle 10. However, it is within the scope of the present disclosure that traction battery pack 18 may be located elsewhere on electric vehicle 10.
Traction battery pack 18 is an exemplary motorized vehicle battery. Traction battery pack 18 may be a high voltage traction battery pack including a cell-pack battery system 20. Unlike conventional traction battery pack battery systems, the battery cell-battery pack battery system 20 incorporates battery cells or other energy storage devices without arranging the cells in separate arrays or modules. Thus, the cell-to-cell battery system 20 eliminates most, if not all, of the array support structures (e.g., array frames, spacers, stringers, walls, end plates, ties, etc.) necessary to group battery cells into arrays/modules. Furthermore, unlike conventional battery systems that require multiple individual battery arrays/modules that must be connected together after being positioned within the battery housing to achieve an overall voltage potential, the cell-to-battery pack battery system 20 can provide the overall voltage bus potential of the traction battery pack 18 with a single battery cell.
Referring now to fig. 2 and 3, the traction battery pack 18 may include a housing assembly 24 arranged to house the battery cell-pack battery system 20. In an embodiment, the battery cell-to-battery pack battery system 20 includes a plurality of battery cells 26 that are held within an interior region 28 established by the housing assembly 24.
The battery cells 26 may supply electrical power to various components of the motorized vehicle 10. The battery cells 26 may be stacked side-by-side with respect to one another to construct a cell stack 30, and the cell stacks 30 may be positioned side-by-side in rows to provide a cell matrix 32.
In an embodiment, each cell stack 30 includes eight individual battery cells 26, and the cell matrix 32 includes four cell stacks 30 for a total of thirty-two battery cells 26. Providing a uniform number of battery cells 26 and a uniform number of cell stacks 30 may help support an efficient electrical bus arrangement. Although a particular number of battery cells 26 and cell stacks 30 are shown in the various figures of the present disclosure, the cell-to-cell pack battery system 20 of the traction battery pack 18 may include any number of battery cells 26 and any number of cell stacks 30. In other words, the present disclosure is not limited to the exemplary configurations shown in fig. 2 and 3.
In an embodiment, battery cell 26 is a prismatic lithium ion cell. However, battery cells having other geometries (cylindrical, soft pack, etc.) and/or chemistries (nickel-metal hydride, lead acid, etc.) may alternatively be utilized within the scope of the present disclosure.
The housing assembly 24 of the traction battery pack 18 may include a housing cover 34 and a housing tray 36. The housing cover 34 may be secured to the housing tray 36 to provide an interior region 28 for housing the battery cell-pack battery system 20.
The housing tray 36 may include a bottom plate 38 and a plurality of side walls 40 arranged relative to one another to provide a cell compression opening 42. The bottom panel 38 and the side walls 40 may be mechanically coupled to each other, such as by welding, for example.
During assembly of traction battery pack 18, housing cover 34 may be secured to housing tray 36 at interface 44 that substantially encloses interior region 28. In some embodiments, mechanical fasteners 46 may be used to secure the housing cover 34 to the housing tray 36, but other fastening methods (adhesion, etc.) may also be suitable.
The cell matrix 32 of the cell-pack battery system 20 may be positioned within the cell compression openings 42 provided by the housing tray 36. The exemplary housing tray 36 is depicted as including a single cell compression opening 42, however, it should be understood that the present disclosure extends to structural assemblies that provide one or more cell compression openings. The housing cover 34 may cover the cell matrix 32 within the cell compression openings 42 to surround the battery cells 26 on substantially all sides. Once fully assembled and positioned relative to the housing tray 36, the cell matrix 32 can establish a single cell that can provide the overall voltage bus potential of the traction battery pack 18.
The housing tray 36 may compress and retain the cell matrix 32 when the cell matrix 32 is received within the cell compression opening 42. In an embodiment, the side walls 40 of the housing tray 36 apply a force to the cell matrix 32 when the cell matrix 32 is positioned within the cell compression openings 42.
In an embodiment, to insert the cell matrix 32 into the cell compression opening 42, the cell matrix 32 may be compressed first and then moved into place in the cell compression opening 42 when compressed. A compressive force F may be applied to opposite ends of one of the cell stacks 30 C . Compression force F C Essentially compressing the battery cells 26 within the cell stack 30 to thereby electrically couple the cellsThe stack 30 and individual battery cells 26 are compressed to a reduced thickness. When the compression force F C When applied to the cell stack 30, the cell stack 30 may be moved by a downward force F D Inserted into the corresponding cell compression openings 42. Downward force F D May be applied directly to one or more of the battery cells 26.
Although the term "downward" is used herein to describe a downward force F D It should be understood that the term "downward" is also used herein to refer to all forces tending to press the cell stack 30 into the cell compression opening 42. In particular, the term "downward" refers to being substantially perpendicular to the compressive force F C Whether or not the force is truly in a "downward" direction. For example, the present disclosure extends to cell stacks that are compressed laterally and inserted into cell compression openings.
The cell stack 30 may be individually compressed and inserted into the cell compression opening 42. In another embodiment, the entire cell matrix 32 is compressed and inserted into the cell compression openings 42. As schematically shown in fig. 3, in such an embodiment, an additional compressive force F X The cell stacks 30 may be compressed together to insert the cell matrix 32 into the cell compression openings 42. Compression force F X Generally perpendicular to the compressive force F C . Compression force F X Can be matched with the compression force F C Applied together. Force F can then be applied D To move the entire cell matrix 32 into the cell compression openings 42.
In an embodiment, the entire perimeter of the cell compression opening 42 is defined by the side walls 40 of the housing tray 36. The sidewalls 40 may apply compressive force to the battery cells 26 around the entire perimeter of the cell matrix 32. Thus, the sidewalls 40 may serve as a rigid ring-like structure that compresses and tightly holds the cell matrix 32.
The above-described configuration is considered a battery pack of the cell-battery pack type, which is different from the conventional battery pack type that includes a housing holding an array of battery cells enclosed by an array support structure spaced apart from the walls of the battery housing, and in which the battery housing does not apply a compressive force to any battery cells. The cell-pack type battery packs described herein also eliminate the rigid cross members that are typically secured to the housing tray of a conventional traction battery pack to provide mounting points for securing the battery array and housing cover.
The cell-to-battery pack battery system 20 may also include one or more cell row separators 48. In an embodiment, one cell row separator 48 is positioned between each pair of adjacent cell stacks 30 of the cell matrix 32. In other embodiments, two cell row dividers 48 are provided for each cell stack 30. However, the total number of cell row separators 48 disposed within the cell-to-cell battery system 20 is not intended to limit the present disclosure.
The cell-to-battery pack battery system 20 may also include one or more retention assemblies 50 for retaining each cell stack 30/cell matrix 32 relative to the housing tray 36. In an embodiment, two retention assemblies 50 are provided for each cell stack 30 of the cell matrix 32, with one retention assembly 50 being provided at each longitudinal extent of the cell stack 30. However, the total number of retention assemblies 50 disposed within the cell-to-battery pack system 20 is not intended to limit the present disclosure. When the cell matrix 32 is fully assembled, the battery cells 26 may be stacked between the retention assemblies 50.
As described in further detail below, the retention assembly 50 may provide various functions and advantages to the cell-to-battery pack battery system 20, including, but not limited to, facilitating insertion of the cell stack 30/cell matrix 32 into the housing tray 36; holding the cell stack 30 at the cell stack-housing tray interface; increasing stiffness on the cell matrix 32, etc. The functionality provided by the retention assembly 50 described herein may be particularly advantageous for traction battery packs that include battery systems of the cell-to-battery pack type, because the array support structure conventionally provided within the battery array has been largely eliminated from the cell-to-battery pack battery system 20, and the rigid cross members conventionally provided for establishing mounting points for the fixed battery cell assemblies have been eliminated from the housing tray 36.
With continued reference to fig. 1-3, fig. 4, 5, and 6 illustrate exemplary designs of a retention assembly 50 for use within the battery cell-to-battery pack system 20. As described above, the battery cell-pack battery system 20 may include a plurality of retention assemblies 50. In an exemplary embodiment, two retention assemblies 50 may be provided for each cell stack 30 of the cell-pack battery system 20.
Each retention assembly 50 may include a slider panel 52 and one or more clips 54. Each clip 54 may be secured within a pocket 56 formed in an outer surface 58 of the slider panel 52. When received within the cell compression opening 42, the outer surface 58 of the slider panel 52 faces and interfaces with the inner surface 60 of one of the side walls 40 of the housing tray 36. The opposite outer surface 59 of the slider panel 52 may interface with one of the battery cells 26 of the cell stack 30. The slider panel 52 may be secured to the cell stack 30, such as with one or more sections of double-sided tape or any other suitable adhesive (not shown).
Slider panel 52 may include a relatively nominal thickness T. In some embodiments, the thickness T may be between about 2mm and about 5mm, although other thicknesses may be suitable. Thus, for example, the thickness T is less than the thickness of the battery cells 26. In this disclosure, the term "about" means that the expressed amount or range need not be exact, but may be approximate and/or larger or smaller, reflecting acceptable tolerances, conversion factors, measurement errors and the like. Further, the slider panel 52 may include a rectangular body. However, the size and shape of the slider panel 52 is not intended to limit the present disclosure.
Slider panel 52 may be a polymer-based component. For example, the slider panel 52 may be constructed from sheet molding compound (e.g., fiberglass reinforced polyester), polypropylene, polyamide, or the like.
Each clip 54 may be a metal-based component. For example, the clip 54 may be constructed of aluminum, stainless steel, or the like. In other embodiments, clip 54 may also be a polymer-based component.
Each clip 54 may be generally U-shaped and may include a first leg 62, a second leg 64, and a curved bridge 66 connecting the first leg 62 to the second leg 64. The first leg 62, the second leg 64, and the curved bridge 66 may together establish an integral, one-piece structure of the clip 54. The first leg 62 may include a hooked portion 68 disposed at an end opposite the curved bridge 66, and the second leg 64 may include a retention flange 70 and a tab 72 protruding from the retention flange 70.
Referring now primarily to fig. 7 and 8, the retention assembly 50 may facilitate insertion of the cell stack 30/cell matrix 32 into the housing tray 36 along direction D1. The direction D1 may extend parallel to the Z-axis of the traction battery pack 18 and thus the retention assembly 50 may facilitate insertion of the cell stack 30 toward the bottom plate 38 of the housing tray 36. Once received within the housing tray 36, the slider panel 52 of the retention assembly 50 is positioned axially between the cell stack 30/cell matrix 32 and the side walls 40 of the housing tray 36. The slider panel 52 may extend to a height slightly above the upper surface 99 of the cell stack 30/cell matrix 32.
The retention assembly 50 may also be configured to provide a "hold down" design for holding the cell stack 30/cell matrix 32 relative to the housing tray 36. For example, the clips 54 of the retention assembly 50 may prevent the cell stack 30/cell matrix 32 from being displaced in a second direction D2 opposite the insertion direction D1. In this regard, the first leg 62 of the clip 54 may interface with the slider panel 52 and the second leg 64 of the clip 54 may interface with the side wall 40 of the housing tray 36. The hooked portion 68 of the first leg 62 may engage a lip 74 disposed within the pocket 56 of the outer surface 58 of the slider panel 52 to retain the clip 54 within the pocket 56. Further, the retention flange 70 of the second leg 64 may engage the lip 76 of the sidewall 40 to substantially prevent the cell stack 30 from backing out (e.g., moving in the direction D2) of the housing tray 36. In the fully inserted and retained position, the clip 54 may be positioned at a lower elevation than the upper surface 99 of the cell stack 30/cell matrix 32.
The tab 72 may engage the inner surface 60 of the sidewall 40. The tab 72 allows release of the retention assembly 50 from the sidewall 40 after assembly. For example, a tool may be inserted between tab 72 and inner surface 60 to allow retaining flange 70 to slide past lip 74.
Fig. 9 illustrates another exemplary retention assembly 150 for retaining the cell stack 30/cell matrix 32 relative to the housing tray 36. In this embodiment, the retention assembly 150 includes a slider panel 152, a clip 154, and a spacer 178. The washer 178 may be positioned within a slot 180 that extends between the first leg 162 and the second leg 164 of the clip 154. Shims 178 may be provided for enhancing (e.g., increasing) the compressive force applied to the cell stack 30/cell matrix 32. The thickness of the shim 178 may be varied to provide a desired amount of compressive force.
Fig. 10, 11 and 12 illustrate yet another exemplary retention assembly 250 for retaining the cell stack 30/cell matrix 32 relative to the housing tray 36. In this embodiment, the retention assembly 250 includes a slider panel 252 and a structural adhesive 282. When received within the cell compression opening 42, an outer surface 258 of the slider panel 252 faces and interfaces with the inner surface 60 of one of the side walls 40 of the housing tray 36, and an opposite outer surface 259 of the slider panel 252 may interface with one of the battery cells 26 of the cell stack 30/cell matrix 32.
The slider panel 252 may include one or more pockets 256. Each pocket 256 may establish a fill area for receiving structural adhesive 282. Pocket 256 may include a side wall 284 and a bottom plate 286. A ribbed surface 288 (best shown in fig. 12) may be provided on the side wall 284 and/or the bottom plate 286. The ribbed surface 288 can be configured to increase the amount of surface area available to receive and bond with the structural adhesive 282.
The side walls 284 and floor 286 of the pocket 256 of the slider panel 252 and the inner surface 60 of the side walls 40 of the housing tray 36 may establish a containment perimeter around the structural adhesive 282 for confining the adhesive to a desired location of the traction battery pack 18. Once cured, the structural adhesive 282 may hold the cell stack 30/cell matrix 32 in place and increase the rigidity of the cell-to-battery pack system 20. The structural adhesive 282 may be an epoxy or any other suitable adhesive.
An exemplary retention assembly of the present disclosure provides an interface for a cell stack of a cell-to-cell pack battery system for retaining a traction battery pack. The retention assembly may provide a solution to various assembly complexities that may occur due to the elimination of many array support structures and tray rigid cross members associated with conventional traction battery packs.
Although various non-limiting embodiments are shown with specific components or steps, embodiments of the present disclosure are not limited to these specific combinations. Some features or components from any of the non-limiting embodiments may be used in combination with features or components from any of the other non-limiting embodiments.
It should be understood that the same reference numerals indicate corresponding or analogous elements throughout the several views. It should be understood that while particular component arrangements are disclosed and illustrated in the exemplary embodiments, other arrangements may benefit from the teachings of this disclosure.
The above description should be construed as illustrative and not in any limiting sense. Those of ordinary skill in the art will appreciate that some modifications may occur within the scope of the present disclosure. For these reasons, the following claims should be studied to determine the true scope and content of this disclosure.

Claims (15)

1. A traction battery pack, comprising:
a housing assembly including a housing tray;
a cell-to-cell battery system housed within the housing assembly and including a cell stack and a retention assembly; and is also provided with
The retention assembly includes a slider panel that establishes an interface between the cell stack and a sidewall of the housing tray.
2. The traction battery pack of claim 1, wherein the slider panel is secured to battery cells located at a longitudinal extent of the cell stack.
3. The traction battery pack of claim 1 or 2, wherein the cell stack establishes a cell row of a cell matrix of the cell-battery pack battery system, and optionally wherein the housing tray provides a cell compression opening for compressing the cell matrix.
4. The traction battery pack of any preceding claim, wherein the retention assembly further comprises a clip received within a pocket of the slider panel.
5. The traction battery pack of claim 4, wherein the clip includes a first leg that interfaces with the slider panel and a second leg that interfaces with the side wall of the housing tray.
6. The traction battery pack of claim 5, wherein the first leg includes a hooked portion that engages a lip disposed within the pocket of the slider panel, and further wherein the second leg includes a retaining flange that engages a lip of the side wall and a tab that engages an inner surface of the side wall.
7. The traction battery pack of any preceding claim, wherein the retention assembly further comprises a clip received in a pocket of the slider panel and a spacer received in a slot of the clip.
8. The traction battery pack of any preceding claim, wherein the retention assembly further comprises a structural adhesive received within a pocket of the slider panel, and optionally wherein a sidewall of the pocket, a floor of the pocket, and an inner surface of the sidewall of the housing tray establish a containment perimeter around the structural adhesive.
9. The traction battery pack of claim 8, wherein at least one of the side walls or the floor includes a ribbed surface.
10. A traction battery pack, comprising:
a housing assembly including a housing cover and a housing tray;
a cell-battery pack battery system housed within the housing assembly and including a cell matrix and a retention assembly; and is also provided with
The retention assembly includes a slider panel that establishes an interface between the cell matrix and a sidewall of the housing tray.
11. The traction battery pack of claim 10, wherein the cell matrix comprises a plurality of cell stacks.
12. The traction battery pack of claim 10 or 11, wherein the retention assembly further comprises a clip received within a pocket of the slider panel, and optionally wherein the clip comprises a first leg that interfaces with the slider panel and a second leg that interfaces with the side wall of the housing tray.
13. The traction battery pack of claim 12, wherein the first leg includes a hooked portion that engages a lip disposed within the pocket of the slider panel, and further wherein the second leg includes a retaining flange that engages a lip of the side wall and a tab that engages an inner surface of the side wall.
14. The traction battery pack of any one of claims 10-13, wherein the retention assembly further comprises a clip received within a pocket of the slider panel and a spacer received within a slot of the clip.
15. The traction battery pack of any one of claims 10-14, wherein the retention assembly further comprises a structural adhesive received within a pocket of the slider panel, and optionally wherein the pocket comprises a ribbed surface.
CN202310223671.3A 2022-03-23 2023-03-09 Traction battery pack retention assembly with cell-pack battery system Pending CN116805744A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US63/322,766 2022-03-23
US17/851,571 2022-06-28
US17/851,571 US20230307768A1 (en) 2022-03-23 2022-06-28 Retention assemblies for traction battery packs with cell-to-pack battery systems

Publications (1)

Publication Number Publication Date
CN116805744A true CN116805744A (en) 2023-09-26

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