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CN-122000597-A - Battery pack and vehicle

CN122000597ACN 122000597 ACN122000597 ACN 122000597ACN-122000597-A

Abstract

There is provided a battery pack and a vehicle, more particularly the present disclosure relates to a battery pack (4), the battery pack (4) comprising a plurality of battery layers (6) stacked on each other, wherein at least adjacent stacked first (61) and second (62) battery layers of the plurality of battery layers (6) comprise-a plurality of battery stacks (8), each comprising a plurality of battery cells (9) stacked together, -a substrate (10), wherein the plurality of battery stacks (8) are arranged on the substrate (10), -a frame arrangement (12) mechanically connected to the substrate (10) and surrounding the plurality of battery stacks (8). The disclosure also relates to a vehicle (2).

Inventors

  • Dilendra Lauter
  • Mike Iranezad
  • Casper Rongsong

Assignees

  • 沃尔沃卡车集团

Dates

Publication Date
20260508
Application Date
20251103
Priority Date
20241105

Claims (15)

  1. 1. A battery pack (4) having a first extension along a first axis (x), a second extension along a second axis (y), and a third extension along a third axis (z), wherein the first axis (x), the second axis (y), and the third axis (z) are perpendicular, the battery pack (4) comprising a plurality of battery layers (6) stacked on top of each other along the third axis (z), wherein at least adjacent stacked ones of the plurality of battery layers (6) of first and second battery layers (61, 62) comprise: A plurality of cell stacks (8), each comprising a plurality of battery cells (9) stacked together, -A substrate (10), wherein the plurality of cell stacks (8) is arranged on the substrate (10), -A frame means (12) mechanically connected to said substrate (10) and surrounding said plurality of stacks (8), as seen in a section perpendicular to said third axis (z), Wherein the frame means (12) comprises: a pair of side walls (14) extending along the first axis (x), wherein the cell stack (8) is located between the pair of side walls (14) along the second axis (y), A pair of end members (16) extending along the second axis (y) and mechanically connecting the pair of side walls (14), and wherein the plurality of cell stacks (8) are located between the pair of end members (16), Wherein the first cell layer (61) and the second cell layer (62) are connected via a sealed Connection Interface (CI), Wherein the substrate (10) of one of the first cell layer (61) and the second cell layer (62) is arranged at the sealed Connection Interface (CI), and Wherein the sealed Connection Interface (CI) is configured such that: The first cell layer (61) and the second cell layer (62) are mechanically connected to each other via their frame means (12), and The sealed Connection Interface (CI) completely encloses the substrate (10) arranged at the sealed Connection Interface (CI), as seen in a section perpendicular to the third axis (z).
  2. 2. The battery pack (4) according to claim 1, wherein for at least one of the first and second battery layers (6), the plurality of battery cells (9) of the respective cell stack are stacked along the second axis (y), and wherein the plurality of cell stacks (8) are arranged along the first axis (x).
  3. 3. Battery pack (4) according to any of the preceding claims, wherein the frame means (12) of the first and second battery layers (6) are mechanically connected to each other by one or more first fasteners (F1).
  4. 4. A battery pack (4) according to claim 3, wherein at least one first fastener (F1) of the one or more first fasteners (F1) is arranged in a complementary hole (181, 182) of the frame arrangement (12), wherein one of the complementary holes (181) in one of the frame arrangements has a fastener opening (1811) which is accessible from a side (121) of the frame arrangement (12) which is remote from the frame arrangement (12) in a direction along the first axis (x) or in a direction along the second axis (y).
  5. 5. Battery pack (4) according to any of the preceding claims, wherein the base plate (10) arranged at the sealed Connection Interface (CI) is arranged with respect to its frame means (12) such that the base plate (10) extends along the third axis (z) inside the frame means (12).
  6. 6. Battery pack (4) according to claim 5, wherein the base plate (10) arranged at the sealed Connection Interface (CI) is arranged with respect to its frame means (12) such that the base plate (10) is completely inside the frame means (12), as seen along the third axis (z).
  7. 7. Battery pack (4) according to any of the preceding claims, wherein the base plate (10) arranged at the sealed Connection Interface (CI) is mechanically connected to its frame means (12) via one or more second fasteners (F2).
  8. 8. Battery pack (4) according to any of the preceding claims, wherein the base plate (10) arranged at the sealed Connection Interface (CI) comprises one or more attachment flanges (101) provided at the outer periphery (P1) of the base plate (10), as seen in a cross section perpendicular to the third axis (z), wherein the base plate (10) is mechanically connected to its frame means via the one or more attachment flanges (101), and wherein the one or more attachment flanges extend at least partially between the frame means (12) of the first and second battery layers (6).
  9. 9. The battery pack (4) according to any one of the preceding claims, wherein at least one battery layer (6) of the first and second battery layers comprises a cross member (13) extending along the second axis (y) and mechanically connecting the pair of side walls (14), and wherein the cross member (13) is located between adjacent cell stacks (8).
  10. 10. The battery pack (4) according to any one of the preceding claims, wherein at least one of the first and second battery layers (6) comprises a clamping member (22, 131) configured to clamp at least one battery cell (9) towards the substrate (10) on which the at least one battery cell (9) is arranged.
  11. 11. The battery pack according to claims 9 and 10, wherein the clamping member (131) is attached to the cross member (13).
  12. 12. The battery pack according to claim 11, wherein the clamping member (131) extends along the first axis (x) such that the clamping member (131) and the cross member (13) form a T-shape, as seen in a cross section perpendicular to the second axis (y), wherein at least one of the battery cells (9) in each of the adjacent cell stacks (8) relative to the cross member (13) is clamped between the clamping member (13) and the substrate (10).
  13. 13. The battery pack (4) according to any of the preceding claims, wherein for at least one of the first and second battery layers (6), the at least one battery layer comprises an outer spacer (32), wherein the outer spacer (32) is located between one of the side walls (14) and one of the cell stacks (8), and wherein the outer spacer (32) is configured to deform upon expansion of the cell stack (8).
  14. 14. The battery pack (4) according to claim 13, wherein the cell stack (8) is compressed between the pair of side walls (14) of the frame device (12) via the outer spacer (32).
  15. 15. A vehicle comprising the battery pack according to any one of claims 1 to 14.

Description

Battery pack and vehicle Technical Field The present disclosure relates generally to energy storage systems. In a particular aspect, the present disclosure relates to a battery pack and a vehicle. The present disclosure is applicable to heavy vehicles such as trucks, buses, and construction equipment, as well as other vehicle types. Although the present disclosure may be described with respect to a particular vehicle, the present disclosure is not limited to any particular vehicle. Background The battery pack typically includes a plurality of battery cells, i.e., electrochemical battery cells, electrically connected in series and/or parallel. The battery pack may include one or more individual battery cell stacks. The battery cells may be prismatic battery cells or cylindrical battery cells. Because of trends such as motorization with respect to vehicles, there is a continuing effort to develop improved technologies related to battery packs, such as to provide reliable, robust, and/or space-saving cost-effective configurations. Disclosure of Invention According to a first aspect of the present disclosure, a battery pack is provided. The battery pack has a first extension along a first axis, a second extension along a second axis, and a third extension along a third axis, wherein the first axis, the second axis, and the third axis are perpendicular. The battery pack includes a plurality of battery layers stacked one on another along the third axis, wherein respective ones of at least adjacently stacked first and second battery layers of the plurality of battery layers include: A plurality of cell stacks, each cell stack comprising a plurality of battery cells stacked together, A substrate, wherein the plurality of cell stacks are arranged on the substrate, A frame means mechanically connected to the substrate and surrounding the plurality of cell stacks, as seen in a section perpendicular to the third axis, Wherein the frame means comprises: A pair of side walls extending along the first axis, wherein the cell stack is located between the pair of side walls along the second axis, -A pair of end members extending along the second axis and mechanically connecting the pair of side walls, and wherein the plurality of cell stacks are located between the pair of end members. A first aspect of the present disclosure may seek to provide a reliable, robust, and/or space-saving, cost-effective battery pack configuration. Technical benefits may include that the frame arrangement disclosed herein provides effective protection for the battery cells, such as the frame arrangement of multiple battery layers may together at least partially form an outer cover of a battery pack sealed from the external environment. Optionally, in some examples, including in at least one preferred example, the first and second battery layers are connected via a sealed connection interface. Wherein the substrate of one of the first and second battery layers is arranged at the sealed connection interface, and Wherein the sealed connection interface is configured such that: The first cell layer and the second cell layer are mechanically connected to each other via frame means thereof, and The sealed connection interface completely encloses the substrate arranged at the sealed connection interface, as seen in a section perpendicular to the third axis. Technical benefits may include implementing a cell to pack configuration in which the risk of leakage to the battery pack at the intersections between battery layers is reduced. For example, by arranging the substrate arranged at the sealed connection interface such that it is disposed entirely inside the battery pack, i.e. also inside the sealed connection interface, a more reliable cell-to-cell direct connection pack configuration can be achieved. Optionally, in some examples, including in at least one preferred example, for at least one of the first and second battery layers, the plurality of battery cells of a respective cell stack are stacked along the second axis, and wherein the plurality of cell stacks are arranged along the first axis. Technical benefits may include achieving efficient packaging of battery cells, e.g., achieving high energy density. Additionally or alternatively, technical benefits may include that any expansion forces from the respective cell stacks may be borne by the same structural components (i.e., by a pair of side walls) of each cell stack. This may mean that the battery pack configuration is stronger, e.g. allowing the battery pack to be longer along the first axis without having a too great negative impact on the stiffness of the battery pack. Optionally, in some examples, including in at least one preferred example, the battery cells may comprise prismatic battery cells. Additionally or alternatively, the battery cells may comprise cylindrical battery cells. The prismatic battery cell may include a top surface, a bottom surface, and four intermediate side surfaces