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EP-4199191-B1 - BATTERY MODULE AND BATTERY PACK COMPRISING SAME

EP4199191B1EP 4199191 B1EP4199191 B1EP 4199191B1EP-4199191-B1

Inventors

  • PARK, SUBIN
  • SEONG, JUNYEOB
  • PARK, WON KYOUNG
  • HAN, Honggoo

Dates

Publication Date
20260506
Application Date
20211223

Claims (18)

  1. A battery module (100, 200) comprising: a battery cell stack (120, 220) including a plurality of battery cells (110, 210) stacked in a first direction; a first heat sink (160, 265) located at a lower part of the battery cell stack (120, 220); a first thermal conductive resin layer (140, 245) located between the battery cell stack (120, 220) and the first heat sink (160, 265); and an exterior member (150, 250) surrounding the outer surface of the battery cell stack (120, 220), wherein the battery cell stack (120, 220) comprises at least one cooling fin (117, 217) located between battery cells (110, 210) adjacent to each other among the plurality of battery cells (110, 210), wherein the first thermal conductive resin layer (140, 245) and the first heat sink (160, 265) are located between the exterior member (150, 250) and a lower surface of the battery cell stack (120, 220), wherein the lower surface of the battery cell stack (120, 220) is in direct contact with the thermal conductive resin layer (140, 245), wherein the thermal conductive resin layer (140, 245) is in contact with the heat sink (160, 265), wherein a lower side surface of the cooling fin (117, 217) is in contact with the thermal conductive resin layer (140, 245), wherein the first heat sink (160, 265) comprises a cooling flow path through which refrigerant may flow, and wherein the cooling flow path and the first thermal conductive resin layer (140, 245) are in contact with each other.
  2. The battery module according to claim 1, wherein: an outer surface of the exterior member (150, 250) of the battery module (100, 200) is exposed.
  3. The battery module according to claim 2, wherein: the exterior member (150, 250) presses the upper and lower surfaces of the battery cell stack (120, 220) in a second direction, and the second direction is perpendicular to the first direction.
  4. The battery module according to claim 3, wherein: the second direction is a width direction of the plurality of battery cells (110, 210).
  5. The battery module according to claim 4, wherein: the exterior member (150, 250) is made of an elastic material.
  6. The battery module according to claim 5, wherein: the exterior member (150, 250) is made of an elastic material, and the exterior member (150, 250) is formed such that the film of the elastic material wraps the outer surface of the battery cell stack (120, 220).
  7. The battery module according to claim 5, wherein: the exterior member (150, 250) is made of a heat-shrinkable tube, and front and back surfaces of the heat-shrinkable tube are opened.
  8. The battery module according to claim 4, wherein: a first adhesive layer is located between the cooling fins (117, 217) and the battery cell (110, 210).
  9. The battery module according to claim 4, wherein: the battery module (100, 200) further comprises compression pads (115, 215) located on both side surfaces of the battery cell stack (120, 220), and the compression pad (115, 215) is located between the exterior member (150, 250) and the outside surface of the battery cell stack (120, 220).
  10. The battery module according to claim 9, wherein: a second adhesive layer is located between the compression pad (115, 215) and the battery cell (110, 210).
  11. The battery module according to claim 1, wherein: the battery module further comprises a second heat sink (261) located on the upper part of the battery cell stack (120, 220) and a second thermal conductive resin layer (241) located between the battery cell stack (120, 220) and the second heat sink (261), and the second thermal conductive resin layer (241) and the second heat sink (261) are located between the exterior member (150, 250) and an upper surface of the battery cell stack (120, 220).
  12. The battery module according to claim 11, wherein: an upper side surface of the cooling fin (117, 217) is in contact with the second thermal conductive resin layer (241).
  13. A battery pack (1000, 2000) in which the battery module (100, 200) of claim 1 is mounted on a pack frame (1200, 1300, 2200, 2300), and an outer surface of the exterior member (150, 250) and the pack frame (1200, 1300, 2200, 2300) are in contact with each other.
  14. The battery pack according to claim 13, wherein: the pack frame (1200, 1300, 2200, 2300) comprises a lower pack frame (1300, 2300) on which at least two of the battery modules (100, 200) are mounted and an upper pack frame (1200, 2200) for covering the upper parts of the at least two battery modules (100, 200), and comprises a plurality of first beams (1310, 2310) extending from one side surface of the lower pack frame (1300, 2300) towards the other side surface.
  15. The battery pack according to claim 14, wherein: the battery module (100, 200) is mounted between the first beams (1310, 2310) that are adjacent to each other among the plurality of first beams (1310, 2310).
  16. The battery pack according to claim 15, wherein: the lower pack frame (1300, 2300) further comprises a plurality of second beams (1350, 2350) perpendicular to the first beam (1310, 2310), and the plurality of second beams (1350, 2350) are respectively located between one surface of the battery module (100, 200) and a side surface of the lower pack frame (1300, 2300),
  17. The battery pack according to claim 16, wherein: one surface of the second beam (1350, 2350) is in contact with an electrode lead protruding from one surface of the battery module (100, 200).
  18. The battery pack according to claim 17, wherein: an insulating coating layer is formed on one surface of the second beam (1350, 2350).

Description

[TECHNICAL FIELD] The present disclosure relates to a battery module and a battery pack including the same, and more particularly to a battery module that improves the cooling performance of battery cells and reduces the cooling deviation between battery cells and a battery pack including the same. [BACKGROUND] Along with the increase of technology development and demands for mobile devices, the demand for batteries as energy sources is increasing rapidly. In particular, a secondary battery has attracted considerable attention as an energy source for power-driven devices, such as an electric bicycle, an electric vehicle, and a hybrid electric vehicle, as well as an energy source for mobile devices, such as a mobile phone, a digital camera, a laptop computer and a wearable device. Small-sized mobile devices use one or several battery cells for each device, whereas middle or large-sized devices such as vehicles require high power and large capacity. Therefore, a middle or large-sized battery module having a plurality of battery cells electrically connected to one another is used. The middle or large-sized battery module is preferably manufactured so as to have as small a size and weight as possible. Consequently, a prismatic battery, a pouch-shaped battery or the like, which can be stacked with high integration and has a small weight relative to capacity, is mainly used as a battery cell of the middle or large-sized battery module. Meanwhile, in order to protect the battery cell stack from external impact, heat or vibration, the battery module may include a module frame which is opened in its front and rear sides and houses the battery cell stack in an internal space. Considering that the temperature of the battery cell is one of the factors that limit the output of the battery, the local temperature rise that occurs in the battery cell is highly likely to limit the output of the battery early, and thus it needs to be improved. Additionally, as the battery module has become larger in recent years, the number of battery cells stacked in the module has increased, the cooling deviation between the battery cells is further deepened. Therefore, there is a need to develop a battery module that improves the cooling performance against heat generated in the battery cell stack and reduces the cooling deviation between battery cells, and a battery pack including the same. EP 3 758 090 A1, EP 2 955 780 and WO 2019/167689 A1 disclose battery packs having cooling plates below a stack of cells, wherein refrigerant can flow through cooling flow paths formed in channels extending through, and contained by, these cooling plates. [DETAILED DESCRIPTION OF THE INVENTION] [Technical Problem] It is an object of the present disclosure to provide a battery module that improves the cooling performance of battery cells and reduces the cooling deviation between battery cells, and a battery pack including the same. The objects of the present disclosure are not limited to the aforementioned objects, and other objects which are not described herein should be clearly understood by those skilled in the art from the following detailed description and the accompanying drawings. [Technical Solution] According to one aspect of the present disclosure, there is provided a battery module comprising: a battery cell stack including a plurality of battery cells stacked in a first direction; a first heat sink located at a lower part of the battery cell stack; a first thermal conductive resin layer located between the battery cell stack and the first heat sink; and an exterior member surrounding the outer surface of the battery cell stack, wherein the battery cell stack comprises at least one cooling fin located between battery cells adjacent to each other among the plurality of battery cells, and wherein the first thermal conductive resin layer and the first heat sink are located between the exterior member and a lower surface of the battery cell stack. An outer surface of the exterior member of the battery module may be exposed. The exterior member presses the upper and lower surfaces of the battery cell stack in a second direction, and the second direction may be perpendicular to the first direction. The second direction may be a width direction of the plurality of battery cells. The exterior member may be made of an elastic material. The exterior member may be made of an elastic material. The exterior member may be formed such that the film of the elastic material wraps the outer surface of the battery cell stack. The exterior member is made of a heat-shrinkable tube, and front and back surfaces of the heat-shrinkable tube may be opened. A lower side surface of the cooling fin is in contact with the first thermal conductive resin layer. A first adhesive layer may be located between the cooling fins and the battery cell. The battery module further comprises compression pads located on both side surfaces of the battery cell stack, and the compression