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EP-4738592-A2 - BATTERY PACK

EP4738592A2EP 4738592 A2EP4738592 A2EP 4738592A2EP-4738592-A2

Abstract

A battery pack includes a cell stack in which a plurality of battery cells are stacked; a pack case accommodating the cell stack therein, a partition member partitioning an internal space of the pack case into a plurality of spaces, and a blocking member disposed between the partition member and the pack case to block heat propagation between the plurality of spaces.

Inventors

  • HAN, JIN SU
  • KANG, MIN SONG
  • PARK, JU YONG
  • CHO, SEI HOON
  • KIM, JI WOONG
  • PAK, BYEONG JUN

Assignees

  • SK On Co., Ltd.

Dates

Publication Date
20260506
Application Date
20220922

Claims (13)

  1. A battery pack (1) comprising: a cell stack (10) in which a plurality of battery cells are stacked; a pack case (50) accommodating the cell stack (10) therein; a partition member (60, 70) partitioning an internal space of the pack case (50) into a plurality of spaces; and a blocking member (80) disposed between the partition member (60, 70) and the pack case (50) to block heat propagation between the plurality of spaces; wherein the pack case (50) includes: a lower plate (52) covering a lower portion of the internal space; and an upper plate (53) covering an upper portion of the internal space, wherein the partition member (60, 70) includes: a first partition member (70) having a lower surface fastened to the lower plate (52) and an upper surface fastened to the upper plate (53); and a second partition member (60) having a lower surface fastened to the lower plate (52) and an upper surface fastened to the blocking member (80).
  2. The battery pack (1) of claim 1, wherein the blocking member (80) is disposed between the second partition member (60) and the upper plate (53).
  3. The battery pack (1) of claim 1 or 2, wherein the blocking member (80) includes: a frame (82) having a polygonal cross-section; and a fire resistant member (84) disposed on a surface of the frame (82).
  4. The battery pack (1) of claim 3, wherein the fire resistant member (84) is disposed on both sides of the frame (82).
  5. The battery pack (1) of anyone of the preceding claims, further comprising a fastening member (90) fastened to the partition member (60, 70) sequentially through the upper plate (53) and the blocking member (80).
  6. The battery pack (1) of anyone of the preceding claims, wherein the first partition member (70) and the second partition member (60) are disposed to be perpendicular to each other and joined to each other by welding.
  7. The battery pack (1) of anyone of the preceding claims, wherein the first partition member (70) is disposed to be parallel to a length direction of the cell stack (10), and the second partition member (60) is disposed to be parallel to a width direction of the cell stack (10).
  8. The battery pack (1) of anyone of the preceding claims, wherein the second partition member (60) is disposed to face a terminal (11) of the cell stack (10).
  9. The battery pack (1) of anyone of the preceding claims, wherein at least a portion of the second partition member (60) is formed of a material having a melting point higher than that of the lower plate (52).
  10. The battery pack (1) of anyone of the preceding claims, wherein the upper plate (53) is in surface contact with an upper surface of the first partition member (70) and an upper surface of the blocking member (80).
  11. The battery pack (1) of anyone of the preceding claims, wherein the second partition member (60) is formed to have a height smaller than that of the cell stack (10).
  12. The battery pack (1) of anyone of the preceding claims, further comprising: a connection member (20) disposed on an upper portion of the partition member (60, 70) and electrically connecting the cell stack (10), wherein the blocking member (80) includes an insertion recess (88) into which the connection member (20) is inserted.
  13. The battery pack (1) of claim 12, wherein the insertion recess (88) is formed on a surface facing the partition member (60, 70).

Description

BACKGROUND 1. FIELD The present disclosure relates to a battery pack having improved safety. 2. DESCRIPTION OF RELATED ART Unlike primary batteries, secondary batteries may be charged and discharged, and thus may be applied to devices within various fields such as digital cameras, mobile phones, notebook computers, hybrid vehicles, and electric vehicles. Among secondary batteries, lithium secondary batteries having high energy density and a high discharge voltage have been actively manufactured. The lithium secondary batteries are manufactured as pouch-type battery cells having flexibility, prismatic battery cells having rigidity, or cylindrical type battery cells. A plurality of battery cells are stacked on each other and are mounted in a pack case in units of cell stacks that are electrically connected to form a battery pack. Such a battery pack is installed and used in an electric vehicle or the like. However, in such a related art battery pack, if one cell stack ignites, heat or flames may be easily transferred to another cell stack adjacent thereto, and thus secondary ignition or an explosion may occur. Therefore, there is a demand for a battery pack capable of preventing secondary ignition or explosions. SUMMARY Exemplary embodiments provide a battery pack in which an occurrence of secondary ignition or explosion due to a flames or high-temperature gas occurring therein is suppressed. According to an aspect of the present disclosure, a battery pack includes a cell stack in which a plurality of battery cells are stacked; a pack case accommodating the cell stack therein; a partition member partitioning an internal space of the pack case into a plurality of spaces; and a blocking member disposed between the partition member and the pack case to block heat propagation between the plurality of spaces. The pack case may include a sidewall portion forming an internal space; a lower plate covering a lower portion of the internal space; and an upper plate covering an upper portion of the internal space, wherein the blocking member may be disposed between the partition member and the upper plate. The blocking member may include a frame having a polygonal cross-section; and a fire resistant member disposed on a surface of the frame. The fire resistant member may be disposed on both sides of the frame. The battery pack may further include: a fastening member fastened to the partition member sequentially through the upper plate and the blocking member. The partition member may include a first partition member having a lower surface fastened to the lower plate and an upper surface fastened to the upper plate; and a second partition member having a lower surface fastened to the lower plate and an upper surface fastened to the blocking member. The first partition member and the second partition member may be disposed to be perpendicular to each other and joined to each other by welding. The first partition member may be disposed to be parallel to a length direction of the cell stack, and the second partition member may be disposed to be parallel to a width direction of the cell stack. The second partition member may be disposed to face a terminal of the cell stack. At least a portion of the second partition member may be formed of a material having a melting point higher than that of the lower plate. The upper plate may be in surface contact with an upper surface of the first partition member and an upper surface of the blocking member. The second partition member may be formed to have a height smaller than that of the cell stack. The battery pack may further include a connection member disposed on an upper portion of the partition member and electrically connecting the cell stack, wherein the blocking member may include an insertion recess into which the connection member is inserted. The insertion recess may be formed on a surface facing the partition member. BRIEF DESCRIPTION OF DRAWINGS The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: FIG. 1 is a perspective view schematically illustrating a battery pack according to an exemplary embodiment in the present disclosure;FIG. 2 is a partially exploded perspective view of FIG. 1;FIG. 3 is a partially enlarged perspective view of a partition member of FIG. 1;FIG. 4 is a partially exploded perspective view of FIG. 3;FIG. 5 is an exploded perspective view of a blocking member illustrated in FIG. 4;FIG. 6 is a cross-sectional view taken along line I-I' of FIG. 1;FIG. 7 is an exploded perspective view illustrating a blocking member and a partition member according to another exemplary embodiment in the present disclosure; andFIG. 8 is a cross-sectional view of a battery pack corresponding to II-II' of FIG. 7. DETAILED DESCRIPTION Prior to the description of the present invention, terms and words used in the pr