WO2022223666A1 - Élément de batterie comprenant un boîtier qui se verrouille mécaniquement avec un boîtier d'élément de batterie adjacent voisin - Google Patents

Élément de batterie comprenant un boîtier qui se verrouille mécaniquement avec un boîtier d'élément de batterie adjacent voisin Download PDF

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Publication number
WO2022223666A1
WO2022223666A1 PCT/EP2022/060496 EP2022060496W WO2022223666A1 WO 2022223666 A1 WO2022223666 A1 WO 2022223666A1 EP 2022060496 W EP2022060496 W EP 2022060496W WO 2022223666 A1 WO2022223666 A1 WO 2022223666A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery cell
battery
casing
side walls
configuration
Prior art date
Application number
PCT/EP2022/060496
Other languages
English (en)
Inventor
Csaba Dobi
Rodyn GILHARRY
Sara HERMANSSON
Daniela BOK
Original Assignee
Northvolt Ab
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
Application filed by Northvolt Ab filed Critical Northvolt Ab
Publication of WO2022223666A1 publication Critical patent/WO2022223666A1/fr

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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
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • 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

Definitions

  • the present disclosure relates to the field of battery packs, and more particular to battery packs for electric applications.
  • Battery packs for electric applications have been used for an extended period of time, and there has always been a challenge to optimize the construction based on energy density, weight and volume.
  • a battery pack comprises a plurality of interconnected battery modules, wherein each battery module comprises a plurality of battery cells.
  • the weight and volume required to integrate a large number of battery cells using battery modules into a battery pack is a disadvantage when optimizing the construction.
  • An object of the present disclosure is to provide a battery pack which seeks to mitigate, alleviate, or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and to provide a battery cell configured to be used in the battery pack.
  • a battery cell comprising a casing having a plurality of side walls, wherein at least two opposing side walls of the plurality of side walls comprises multiple elongated protrusions provided at an outside of the casing.
  • the multiple elongated protrusions are configured to mechanically interlock the battery cell to an adjacently arranged battery cell.
  • An advantage with the battery cell is to improve and simplify the cell to pack assembly process.
  • a battery pack comprising a plurality of battery cells.
  • Each battery cell comprises a casing having a plurality of side walls, wherein at least two opposing side walls of the plurality of side walls comprises multiple elongated protrusions provided at an outside of the casing.
  • a first battery cell is arranged adjacent to a second battery cell, and the first battery cell is mechanically interlocked with the second battery cell.
  • a vehicle comprising a battery pack.
  • the battery pack comprises a plurality of battery cells, wherein each battery cell comprises a casing having a plurality of side walls, and at least two opposing side walls of the plurality of side walls comprises multiple elongated protrusions provided at an outside of the casing.
  • a first battery cell is arranged adjacent to a second battery cell, and the first battery cell is mechanically interlocked with the second battery cell.
  • An advantage with the vehicle is that the weight of the vehicle chassis may be reduced as the battery pack contributes to the overall vehicle stiffness.
  • Figure la is an exploded perspective view of an example embodiment of a battery cell
  • Figure lb is a perspective view of another example embodiment of a battery cell
  • Figure 2 is a top view of a battery pack illustrating a first example embodiment with a plurality of battery cells
  • Figure 3 is a top view of a battery pack illustrating a second example embodiment with a plurality of battery cells
  • Figure 4 is a perspective view of a battery pack comprising a third example embodiment with a plurality of battery cells.
  • Figure 5 is a top view of the battery pack of figure 4.
  • the battery pack comprises battery cells, which may be prismatic cells, often referred to as "secondary cells", (in particular lithium-ion cells) and the example embodiments of the battery pack may be used for electric vehicles.
  • FIG. la is an exploded perspective view of an example embodiment of a battery cell 10 comprising a casing having side walls lla-lld, a bottom plate 12 and a top plate 13.
  • the casing is provided to house an electrochemical cell structure 19 which is electrically connected to terminals 14, 15 via tabs 16 through openings in the top plate 13.
  • the bottom plate 12 and the top plate 13 are rectangular, and the side walls lla-lld are divided into two opposing walls 11a, lib being longer than two additional side walls 11c, lid of the battery cell.
  • each ridge 17 in the shape of elongated protrusions in this example nine ridges, are provided along each longer side wall 11a, lib extending from the top plate 13 to the bottom plate 12.
  • the ridges are configured to mechanically interlock the battery cell 10 to an adjacently arranged battery cell, as described in connection with figures 2, 3, 4 and 5.
  • each ridge has a cross-sectional dove-tailed shape.
  • other cross-sectional shapes having the same functionality to interlock two adjacently arranged battery cells may be used, e.g. a T- shaped cross section, as long as the profiles are holding the battery cells together.
  • the shorter side walls 11c, lid are in this example provided with one distance element 18 configured to provide a distance to an adjacently arranged battery cell, as described in connection with figures 4 and 5.
  • the distance element 18 has a rectangular cross-sectional shape.
  • the side walls lla-llc may be manufactured in a single piece 11, e.g. from an extruded Aluminium profile, machined metal, plastic or overmoulded plastic material.
  • the side walls lla-lld may be manufactured as separate components from the ridges 17, and the ridges 17 may then be attached to the side walls lla-lld as a separate piece or separate pieces.
  • the side walls lla-lld may be provided with slots or brackets (e.g. formed as part of an extrusion process) for sliding, pushing, or otherwise engaging complementary parts of the ridges 17.
  • such slots or brackets may be provided on the ridges 17 for engaging with complementary parts of the side walls lla-lld.
  • the ridges 17 and the side walls lla-lld are separate pieces, it will be appreciated that they may be made from different materials.
  • the side walls lla- lld may be made from a first material selected for certain properties, and the ridges 17 may be made from a second material selected for other properties.
  • the side walls lla- lld may be made from aluminum, and the ridges 17 may be made from plastic. Therefore, the ridges 17 may advantageously be reduced in weight and/or provide greater compression properties.
  • the ridges 17 are shown running (i.e. extending along a direction) vertically in figure la, it will be appreciated that the ridges 17 may instead run horizontally around (at least some of) the side walls lla-lld, e.g. as shown in figure lb. Furthermore, the direction and placement of the ridges 17 may be selected based on an anticipated arrangement of the battery cells 10 (as discussed in relation to figures 2 and 3). Relative to the plane of the terminals 14, 15, the ridges 17 may run perpendicular thereto (as is the case illustrated in figures la and lb), or parallel thereto.
  • the ridges 17 may be arranged on side walls 11a, lib, and or the upper/lower walls, and may run horizontally (perpendicular to the plane defined by the terminals 14, 15 so-arranged) or vertically (i.e. parallel to said plane). Such an arrangement is shown in the example embodiment illustrated in figure lb.
  • Figure lb further illustrates an example implementation wherein the side walls lla-d of the casing, having ridges integrally formed as part thereof or being attached thereto, may be provided as an outer casing or sheathing into and out of which an inner casing of the cell 10 may be slid or otherwise removed and replaced.
  • Such an arrangement may advantageously allow for a replacement or maintenance of faulty cells or outer casings whilst reusing outer casings or cells (respectively) that are not themselves faulty.
  • Such an arrangement may further allow for a simplified manufacturing of the cell 10 with ridges 17.
  • FIG. 2 is a top view of a battery pack 20 illustrating a first example embodiment with a plurality of battery cells 21, 22.
  • a first type of battery cells 21 has a first configuration 24a, which in this example comprises six elongated protrusions, e.g. ridges or ribs, symmetrically arranged along each long side 23 of the battery cell 21.
  • a second type of battery cells 22 has a second configuration 24b, which in this example comprises five elongated protrusions, e.g. ridges, symmetrically arranged along each long side 25 of the battery cell 22.
  • the first and second configuration are complementary to each other in order to allow battery cells to slide into each other in a first direction and establish a mechanical interlock between the battery cells in two directions perpendicular to the first direction.
  • terminals 14 and 15 are provided on the top plate of the battery cells 21, 22, which may be interconnected using busbars (not shown). In some examples, the terminals 14, 15 may be provided on the side wall (e.g. corresponding to side wall 11c as shown in figure la).
  • FIG. 3 is a top view of a battery pack 30 illustrating a second example embodiment with a plurality of battery cells 31, 32.
  • a first type of battery cells 31 has a first configuration 34a, which in this example comprises five elongated protrusions, e.g. ridges or ribs, asymmetrically arranged along each long side 33 of the battery cell 31.
  • a second type of battery cells 32 has a second configuration 34b, which in this example also comprises five elongated protrusions asymmetrically arranged along each long side 35 of the battery cell 22.
  • the second type of battery cell 32 is created by rotating the first type of battery cell 31 180 degrees, which reduces manufacturing cost since only one type of casing is needed to manufacture the battery pack 30.
  • the first and second configuration are mirror-images of each other and also complementary to each other in order to allow battery cells to slide into each other in a first direction and establish a mechanical interlock between the battery cells in two directions perpendicular to the first direction.
  • some kind of electrical isolation needs to be provided to ensure that the electrochemical cell structure is electrically isolated from an outer surface of the outside of the battery cell. This may be achieved by coating the outer surface of the battery cell with an electrically insulating material. As an example, powder coating may be applied to provide electrical insulation. Another option is to provide an electrically insulating material between the electrochemical cell structure and an internal surface of the casing. As an example, a suitable electrically insulating material may be epoxy powder.
  • the casing may be made from an electrically conductive material but the ridges/ribs may be made from an electrically insulating material such as plastic or the like.
  • FIG 4 is a perspective view of a battery pack 40 comprising a third example embodiment with a plurality of battery cells 41, 42, and Figure 5 is a top view of the battery pack 40 of figure 4.
  • the first type of battery cell 41 comprises nine elongated protrusions, e.g. ridges or ribs, along the longest side of its battery casing and one distance element on the short side.
  • the second type of battery cell 42 comprises eight elongated protrusions, e.g. ridges or ribs, along the longest side of its battery casing and one distance element on the short side.
  • a thermally conductive potting material may be introduced between the battery cells to improve thermal conductivity and enhance cooling of the battery cells when using a cooling plate, which may be positioned adjacent to the bottom plate of the battery cells.
  • the gaps or openings provided by the ridges/ribs may be used to contain thermally conductive or insulating material, to further enhance the thermal protection of the batter cells.
  • such gaps may be filled with a phase change material (PCM), a coolant channel may be threaded therethrough, or the gaps may simply be filled with foam or another insulating material to thereby improve thermal insulation between cells.
  • the filling i.e. placed into the gaps of the ridges
  • the battery pack as disclosed in figures 4 and 5 is suitable to be used in a vehicle, since the weight of the battery pack may be reduced although the weight of each battery cell is higher than a normal battery cell. Furthermore, the weight of the vehicle chassis may be reduced as the battery pack contributes to the overall vehicle stiffness.
  • This disclosure relates to a battery cell 10; 21, 22; 31, 32; 41, 42 comprising a casing having a plurality of side walls lla-lld, wherein at least two opposing side walls 11a, lib of the plurality of side walls comprises multiple elongated protrusions 17; 24a, 24b; 34 provided at an outside of the casing.
  • the multiple elongated protrusions 17; 24a, 24b; 34 are configured to mechanically interlock the battery cell to an adjacently arranged battery cell.
  • the battery cell may comprise a rectangular bottom plate 12 and a rectangular top plate 13, and the two opposing side walls 11a, lib may be the longest side of the battery cell.
  • the adjacently arranged battery cell may be mechanically interlocked to the battery cell in at least two dimensions.
  • the plurality of side walls lla-lld are manufactured as a single piece 11.
  • the single piece 11 is made from a metal, such as Aluminium, and/or plastic material.
  • the single piece 11 is extruded.
  • other types of manufacturing processes may be suitable, such as machining or overmoulding.
  • the single piece may be extruded Aluminium, machined metal, plastic or overmoulded plastic material.
  • At least two elongated protrusion 17 has a cross-sectional dove-tailed shape.
  • the widest part of each elongated protrusion 17 may be distally positioned relative an inside of the battery cell casing.
  • the battery further comprises an electrochemical cell structure 19 arranged within the casing, wherein the electrochemical cell structure is electrically isolated from an outer surface of the outside of the battery cell.
  • the electrochemical cell structure 19 is connected to terminal 14, 15 via tabs 16 through the top plate of the battery casing.
  • the electrical isolation is provided by coating the outer surface of the battery cell with an electrically insulating material. As an example, powder coating may be applied to provide insulation.
  • the electrical isolation is provided by providing an electrically insulating material between the electrochemical cell structure and an internal surface of the casing.
  • a suitable electrically insulating material may be epoxy powder.
  • two additional opposing side walls 11c, lid of the plurality of side walls lla-lld are provided with at least one distance element 18 configured to provide a distance to an adjacently arranged battery cell.
  • the additional opposing side walls 11c, lid may be the shortest side of the battery cell.
  • This disclosure also relates to a battery pack comprising a plurality of battery cells as described above, wherein a first battery cell 21; 31 is arranged adjacent to a second battery cell 22; 32, and the first battery cell is mechanically interlocked with the second battery cell.
  • the adjacently arranged battery cell may be mechanically interlocked to the battery cell in at least two dimensions.
  • the first battery cell 21; 31 has a first configuration 24a; 34a and the second battery cell 22; 32 has a second configuration 24b; 34b, wherein the first configuration 24a; 34a is complementary to the second configuration 24b; 34b.
  • the first configuration 24a is different compared to the second configuration 24b.
  • the first and second configuration may be symmetrically arranged along the side walls 23, 25 and may extend from the top plate 13 to the bottom plate 12.
  • the first configuration may have six elongated protrusions and the second configuration may have five elongated protrusions, i.e. one less than the first configuration.
  • the first configuration 34a is a mirror image of the second configuration 34b.
  • the first and second configuration may be asymmetrically arranged along the side walls 33, 35 and may extend from the top plate 13 to the bottom plate 12.
  • the first and second configuration may have five elongated protrusions, i.e. the same number of elongated protrusions.
  • terminals 15, 16 are arranged on a top surface of the battery pack 20; 30, and the battery pack further comprises a cooling plate arranged to a bottom surface, opposite to the top surface.
  • a thermally conductive potting material is arranged between the battery cells to improve thermal conductivity and enhance cooling of the battery cells using the cooling plate.
  • This disclosure also relates to a vehicle comprising a battery pack as described above.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente invention concerne un élément de batterie (10 ; 21, 22 ; 31, 32 ; 41, 42) comprenant un boîtier ayant une pluralité de parois latérales (11a-11d), au moins deux parois latérales opposées (11a, 11b) de la pluralité de parois latérales comprenant une pluralité de saillies allongées (17 ; 24a, 24b ; 34) disposées à l'extérieur du boîtier. La pluralité de saillies allongées (17 ; 24a, 24b ; 34) sont conçues pour verrouiller mécaniquement l'élément de batterie sur un élément de batterie adjacent. L'invention concerne également un bloc-batterie (20 ; 30) comprenant au moins deux éléments de batterie et un véhicule comprenant au moins un bloc-batterie.
PCT/EP2022/060496 2021-04-21 2022-04-21 Élément de batterie comprenant un boîtier qui se verrouille mécaniquement avec un boîtier d'élément de batterie adjacent voisin WO2022223666A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2150496 2021-04-21
SE2150496-4 2021-04-21

Publications (1)

Publication Number Publication Date
WO2022223666A1 true WO2022223666A1 (fr) 2022-10-27

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PCT/EP2022/060496 WO2022223666A1 (fr) 2021-04-21 2022-04-21 Élément de batterie comprenant un boîtier qui se verrouille mécaniquement avec un boîtier d'élément de batterie adjacent voisin

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147151A (en) * 1958-10-03 1964-09-01 Electro Acid Corp Electric storage battery and casing
EP0065349A1 (fr) * 1981-05-11 1982-11-24 General Motors Corporation Bac de batterie et groupement de batteries en paquet
EP2207221A1 (fr) * 2009-01-09 2010-07-14 Electrochem Solutions, Inc. Bloc-batteries modulaire
WO2016179557A1 (fr) * 2015-05-06 2016-11-10 A123 Systems Llc Système de protection contre un écrasement de batterie
EP3567650A1 (fr) * 2017-04-07 2019-11-13 LG Chem, Ltd. Bloc-batterie ayant une structure de module de batterie extensible

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147151A (en) * 1958-10-03 1964-09-01 Electro Acid Corp Electric storage battery and casing
EP0065349A1 (fr) * 1981-05-11 1982-11-24 General Motors Corporation Bac de batterie et groupement de batteries en paquet
EP2207221A1 (fr) * 2009-01-09 2010-07-14 Electrochem Solutions, Inc. Bloc-batteries modulaire
WO2016179557A1 (fr) * 2015-05-06 2016-11-10 A123 Systems Llc Système de protection contre un écrasement de batterie
EP3567650A1 (fr) * 2017-04-07 2019-11-13 LG Chem, Ltd. Bloc-batterie ayant une structure de module de batterie extensible

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