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CN-122025978-A - Battery cell stack assembly, battery pack and vehicle

CN122025978ACN 122025978 ACN122025978 ACN 122025978ACN-122025978-A

Abstract

The present disclosure relates to a battery cell stack assembly, a battery pack, and a vehicle. More specifically, a battery cell stack assembly (1) comprises-at least one battery cell stack (21-24), -a cooling plate member (4) for cooling the at least one battery cell stack (21-24), and wherein the at least one battery cell stack (21-24) comprises at least one steam chamber (5) configured to transfer heat between a plurality of prismatic battery cells (3) of the battery cell stack (21-24) and the cooling plate member (4). The present disclosure also relates to a battery pack (100) and a vehicle (200).

Inventors

  • Casper Rongsong
  • Christian Nikolasson
  • Mike Iranezad
  • Dilendra Lauter

Assignees

  • 沃尔沃卡车集团

Dates

Publication Date
20260512
Application Date
20251106
Priority Date
20241112

Claims (15)

  1. 1. A battery cell stack assembly (1), comprising: -at least one cell stack (21-24) comprising a plurality of prismatic cell (3) stacked together, a respective prismatic cell being formed by a top surface (31) comprising at least one electrical terminal (311), a bottom surface (32) and four side surfaces (33) connecting the top surface (31) to the bottom surface (32), wherein the plurality of prismatic cell (3) are stacked together along a cell stack longitudinal direction (L) such that the top surfaces (31) of the plurality of prismatic cell (3) are directed in a common direction (D1) perpendicular to the cell stack longitudinal direction (L), A cooling plate member (4) for cooling the at least one battery cell stack (21-24), Wherein the method comprises the steps of The at least one battery cell stack (21-24) further comprises at least one steam chamber (5) configured to transfer heat between the plurality of prismatic battery cells (3) and the cooling plate member (4), The at least one steam chamber (5) comprises a first heat conducting portion (51) extending over adjacently arranged side surfaces (33) of the plurality of prismatic battery cells (3) in the cell stack longitudinal direction (L), and a second heat conducting portion (52) extending over adjacently arranged bottom surfaces (32) of the plurality of prismatic battery cells (3) in the cell stack longitudinal direction (L), The cooling plate part (4) extends in the cell stack longitudinal direction (L) and is arranged at the adjacently arranged bottom surfaces (32) of the plurality of prismatic battery cells (3), and The second heat conducting portion (52) is arranged between the cooling plate member (4) and the adjacently arranged bottom surfaces (32) of the plurality of prismatic battery cells (3) such that heat can be transferred between the second heat conducting portion (52) and the cooling plate member (4).
  2. 2. The battery cell stack assembly (1) according to claim 1, wherein the first thermally conductive portion (51) is a plate element extending over the adjacently arranged side surfaces (33) of the plurality of prismatic battery cells (3) in the cell stack longitudinal direction (L).
  3. 3. The battery cell stack assembly (1) according to any one of the preceding claims, wherein the second thermally conductive portion (52) is a plate element extending over the adjacently arranged bottom surfaces (32) of the plurality of prismatic battery cells (3) in the cell stack longitudinal direction (L).
  4. 4. The battery cell stack assembly (1) according to any one of the preceding claims, wherein the first thermally conductive portion (51) and the second thermally conductive portion (52) comprise a common chamber (53) with a fluid, wherein the at least one steam chamber (5) is arranged to transfer heat between the plurality of prismatic battery cells (3) of the at least one battery cell stack (21-24) and the cooling plate member (4) by a phase change of the fluid.
  5. 5. The battery cell stack assembly (1) according to any one of the preceding claims, wherein the cooling plate member (4) comprises a coolant path (41) and a coolant inlet (42) and a coolant outlet (43) fluidly connected to the coolant path (41).
  6. 6. The battery cell stack assembly (1) according to claim 5, wherein the at least one steam chamber (5) is fluidly separated from the coolant path (41) of the cooling plate member (4).
  7. 7. The battery cell stack assembly (1) according to any one of the preceding claims, wherein the at least one battery cell stack (21-24) comprises a first steam chamber (5) and a second steam chamber (5 ') of the at least one steam chamber, wherein the first thermally conductive portion (51) of the first steam chamber (5) is arranged on a first cell stack side (211) of the at least one battery cell stack (21) and the first thermally conductive portion (51 ') of the second steam chamber (5 ') is arranged on a second cell stack side (212) of the at least one battery cell stack (21), wherein the second cell stack side (212) is an opposite side of the first cell stack side (211).
  8. 8. The battery cell stack assembly (1) according to any one of the preceding claims, comprising a first battery cell stack (21) and a second battery cell stack (22) of the at least one battery cell stack (21-24), wherein the adjacently arranged bottom surfaces (32) of the plurality of prismatic battery cells (3) of the first battery cell stack (21) are provided on a first side (44) of the cooling plate member (4), and the adjacently arranged bottom surfaces (32) of the plurality of prismatic battery cells (3) of the second battery cell stack (22) are provided on a second side (45) of the cooling plate member (4), wherein the second side (45) is the opposite side of the first side (44).
  9. 9. A battery pack (100) having a longitudinal extension in a longitudinal direction (L), a width extension in a width direction (W) and a height extension in a height direction (H), wherein the battery pack (100) comprises a battery cell stack assembly (1) according to any of the preceding claims.
  10. 10. The battery pack (100) according to claim 9, wherein the cooling plate member (4) is a bottom support member of the battery pack (100) having an extension in the longitudinal direction (L) and the width direction (W), and wherein the bottom support member is a load bearing support member for the at least one battery cell stack (21-24).
  11. 11. The battery pack (100) according to claim 9, wherein the cooling plate member (4) is an intermediate support member of the battery pack (100) having an extension in the longitudinal direction (L) and the height direction (H).
  12. 12. The battery pack (100) according to any one of claims 9 to 11, wherein the cell stack longitudinal direction (L) of the at least one battery cell stack (21-24) corresponds to the longitudinal direction (L) of the battery pack (100).
  13. 13. The battery pack (100) according to claim 12, wherein the common direction (D1) extends along the width direction (W) of the battery pack (100).
  14. 14. The battery pack (100) according to claim 12, wherein the common direction (D1) extends along the height direction (H) of the battery pack (100).
  15. 15. A vehicle (200) comprising a battery pack (100) according to any one of claims 9 to 14.

Description

Battery cell stack assembly, 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 cell stack assembly, 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. Because of trends such as motoring with respect to vehicles, there is a continuing effort to develop improved techniques related to battery packs, such as to provide reliable, robust, and/or space-saving cost-effective configurations, and also to provide efficient cooling of battery cells. Disclosure of Invention According to a first aspect of the present disclosure, a battery cell stack assembly is provided. The battery cell stack includes: At least one cell stack comprising a plurality of prismatic battery cells stacked together, a respective prismatic battery cell being formed by a top surface comprising at least one electrical terminal, a bottom surface and four side surfaces connecting the top surface to the bottom surface, wherein the plurality of prismatic battery cells are stacked together along a cell stack longitudinal direction such that the top surfaces of the plurality of prismatic battery cells point in a common direction perpendicular to the cell stack longitudinal direction, A cooling plate member for cooling the at least one battery cell stack, Wherein the method comprises the steps of The at least one battery cell stack further includes at least one vapor chamber configured to transfer heat between the plurality of prismatic battery cells and the cooling plate member, The at least one vapor chamber includes a first thermally conductive portion extending over adjacently disposed side surfaces of the plurality of prismatic battery cells in the cell stack longitudinal direction, and a second thermally conductive portion extending over adjacently disposed bottom surfaces of the plurality of prismatic battery cells in the cell stack longitudinal direction, The cooling plate member extends in the cell stack longitudinal direction and is disposed at the adjacently disposed bottom surfaces of the plurality of prismatic battery cells, and The second thermally conductive portion is disposed between the cooling plate member and the adjacently disposed bottom surfaces of the plurality of prismatic battery cells such that heat may be transferred between the second thermally conductive portion and the cooling plate member. A first aspect of the present disclosure may seek to provide a battery cell stack assembly that improves cooling of prismatic battery cells of a battery cell stack while also achieving a compact, robust and/or reliable configuration. Technical benefits may include that heat may be efficiently transferred between the prismatic battery cells and the cooling plate member. For example, with the battery cell stack assemblies disclosed herein, fewer cooling plate members may be required to achieve efficient cooling, and/or a more compact configuration may be achieved because adjacent battery cell stacks may be positioned closer to each other. Optionally, in some examples, including in at least one preferred example, the first thermally conductive portion is a plate element extending over the adjacently disposed side surfaces of the plurality of prismatic battery cells in the cell stack longitudinal direction. Technical benefits may include achieving a more compact configuration while still achieving proper cooling of the prismatic battery. Optionally, in some examples, including in at least one preferred example, the second thermally conductive portion is a plate element extending above the adjacently disposed bottom surfaces of the plurality of prismatic battery cells in the cell stack longitudinal direction. Technical benefits may include achieving a more compact configuration while still achieving proper cooling of the prismatic battery. Optionally, in some examples, including in at least one preferred example, the first thermally conductive portion is configured to transfer heat along the respective side surface in a direction perpendicular to the cell stack longitudinal direction from the respective adjacently disposed side surface toward the second thermally conductive portion. Optionally, in some examples, including in at least one preferred example, the first thermally conductive portion and the second thermally conductive portion comprise a common chamber with a