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EP-4742397-A2 - BATTERY PACK

EP4742397A2EP 4742397 A2EP4742397 A2EP 4742397A2EP-4742397-A2

Abstract

Disclosed herein relates to a battery pack in which battery modules housed, including: a pack case including a the module area where the battery module may be seated; and a top cover coupled to the pack case to cover the top part of each battery module seated in the pack case, wherein the pack case includes: a base plate supporting a lower part of the battery module; and a side wall coupled along a border of the base plate, wherein the base plate is less thick than the top cover.

Inventors

  • LEE, GI HWAN
  • SHIN, JU HWAN
  • LEE, JAE HYUN
  • LEE, HYOUNG SUK

Assignees

  • LG Energy Solution, Ltd.

Dates

Publication Date
20260513
Application Date
20231110

Claims (15)

  1. A battery pack, comprising: a battery module (M); a pack case (100) including a module area (150) where the battery module (M)is seated; and a top cover (200) coupled to the pack case (100) to cover the top part of each battery module (M) seated in the pack case (100), wherein the pack case (100) comprises: a base plate (110) supporting a lower part of the battery module (M); and a side wall (120) coupled along a border of the base plate (110), wherein the base plate (110) is less thick than the top cover (200).
  2. The battery pack of claim 1, wherein the base plate (110) is deformed by changes in at least one of pressure and temperature in the module area (150).
  3. The battery pack of claim 1, wherein the pack case (110) further comprises: a main separation wall (130) traversing the center and coupled to the base plate (110); and a sub separation wall (140) coupled at both ends to the main separation wall (130) and side wall (120), respectively, and coupled to the base plate (110) at a predetermined distance spaced along the longitudinal direction of the main separation wall (130), wherein the module area (150) is formed in a plurality by compartmentalization of the main separation wall (130 and sub separation wall (140).
  4. The battery pack of claim 3, wherein the pack case (100) further comprises: a support block (160) protruding from a boundary of the sub separation wall (140) and base plate (110), wherein the battery module (M) further comprises a protrusion part (M1) protruding to be supported on the top part of the support block (160) on both sides, and the battery module (M) is fixed to the pack case (100) by a bolt member penetrating the protrusion part (M1) and screwed to the support block (160).
  5. The battery pack of claim 3, wherein the pack case (100) further comprises: a sub separation wall (140) and a fixing member (170) coupled to a battery module (M) seated adjacent the sub separation wall (140), wherein the battery module (M) is fixed to the sub separation wall (140) by screwing together the top end and the end of the fixing member (170).
  6. The battery pack of claim 5, wherein the fixing member (170) spans the sub separation wall (140) to be screw-coupled to battery modules (M) located on both sides of the sub separation wall (140), respectively.
  7. The battery pack of claim 5, wherein the fixing member (170) is fixed by being screw-coupled to the top end of the sub separation wall (140).
  8. The battery pack of claim 3, wherein each of the module areas (150) is sealed by the main separation wall (130) and sub separation wall (140).
  9. The battery pack of claim 3, wherein the base plate (110) is formed by the coupling of a plurality of support plates (111) corresponding to each module area (150), wherein each of the support plates (111) is deformed by changes in at least one of pressure and temperature of a corresponding module area (150).
  10. The battery pack of claim 1, wherein the base plate includes a plurality of protrusions protruding upwardly.
  11. The battery pack of claim 10, wherein the protrusions (112) are formed dispersedly on the top part of the base plate (110) in the form of dots, or are formed extending unidirectionally side by side on the top part of the base plate (110) in the form of lines.
  12. The battery pack of claim 11, wherein the protrusions (112) in the form of dots protrude into either a horn or a column shape.
  13. The battery pack of claim 11, wherein the protrusions (112) in the form of lines extend in the form of either a straight line or a curved line.
  14. The battery pack of claim 1, wherein the base plate (110) has a strength to withstand at least the weight of the battery module (M).
  15. The battery pack of claim 1, wherein the base plate (110) inflates outwardly by the pressure of gases generated in the module area (150).

Description

[Technical Field] The present invention relates to a battery pack, characterized in that it prevents high temperature heat generated by thermal runaway of some of the battery modules housed therein from propagating to other normal battery modules through a base plate corresponding to the bottom of the battery pack. This application claims the benefit of priority to Korean Patent Application No. 10-2022-0151958, filed on November 14, 2022, the disclosure of which is incorporated herein by reference in its entirety. [Background Technology of the Invention] Securing the safety of lithium secondary batteries is one of the most important issues as there is a risk of explosion and fire due to overheating. The problem is that if these abnormalities are not appropriately coped with in the early stages, the internal temperature of the secondary battery will increase rapidly due to heat generation, and the rapid increase in temperature will cause a thermal runaway phenomenon, which may lead to an explosion of the secondary battery, and it may spread to neighboring secondary batteries, causing great damage to the battery pack. FIG. 1 illustrates a pack case 20 comprising a conventional battery pack, and a top cover 10 that is coupled to the pack case 20. As shown in FIG. 1(a), a plurality of battery modules M is supported by a base plate 30 in the lower part, and the side part is supported by a side wall 40 and a separation wall 50. Thus, each battery module M may be protected in all directions by the base plate 30 supporting the lower part, the top cover 10 covering the top part, and the side wall 40 and separation wall 50 supporting the side part. Generally, the base plate 30 is prepared to be thick for stability. Specifically, a conventional base plate 30 is made so that it is not deformed even under the pressure of a high temperature gas generated by the thermal runaway of the battery module M. Therefore, the conventional base plate 30 can continuously maintain contact with the thermally runaway battery module M as shown in FIG. 1(b). Conventional battery packs suffer from the fatal problem that such contact can conduct high temperature heat to other normal battery modules M. [Prior Art Documents] Korean Patent Publication No. 10-2170043911 [Description of the Invention] [Technical Problem] Accordingly, the present invention was conceived to solve the above problems, and aims to provide a battery pack having a structure capable of preventing high temperature heat generated by thermal runaway of some of the battery modules housed therein from propagating to other normal battery modules Other objects and advantages of the present invention will be understood from the following description, and will become apparent from the embodiments of the present invention. In addition, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof disclosed in the claims of the patent. [Technical Solution] According to the present invention, there is provided a battery pack in which battery modules are housed, including: a pack case including a the module area where the battery module may be seated; and a top cover coupled to the pack case to cover the top part of each battery module seated in the pack case, wherein the pack case includes: a base plate supporting a lower part of the battery module; and a side wall coupled along a border of the base plate, wherein the base plate is less thick than the top cover. The base plate may be deformed by changes in at least one of pressure and temperature in the module area. The pack case further includes: a main separation wall traversing the center and coupled to the base plate; and a sub separation wall coupled at both ends to the main separation wall and side wall, respectively, and coupled to the base plate at a predetermined distance spaced along the longitudinal direction of the main separation wall, wherein the module area may be formed in a plurality by compartmentalization of the main separation wall and sub separation wall. The pack case further includes: a support block protruding from a boundary of the sub separation wall and base plate, wherein the battery module may further include a protrusion part protruding to be supported on the top part of the support block on both sides, and the battery module may be fixed to the pack case by a bolt member penetrating the protrusion part and screwed to the support block. The pack case further includes: a sub separation wall and a fixing member coupled to a battery module seated adjacent the sub separation wall, wherein the battery module may be fixed to the sub separation wall by screwing together the top end and the end of the fixing member. The fixing member may span the sub separation wall to be screw-coupled to battery modules located on both sides of the sub separation wall, respectively. The fixing member may be fixed by being screw-coupled to the top en