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EP-4738584-A1 - BATTERY PACK

EP4738584A1EP 4738584 A1EP4738584 A1EP 4738584A1EP-4738584-A1

Abstract

Disclosed is a battery pack. The battery pack includes a case providing an inner space and having a pack cover; a battery cell positioned inside the case; a partition wall configured to partition the inner space of the case; an adhesive member disposed on the partition wall; and a bolt having a head attached to the adhesive member and a body penetrating the pack cover.

Inventors

  • PARK, SHIN-YOUNG
  • KANG, JONG-MO
  • RO, Yong-Hwan
  • MUN, Jeong-O
  • SEO, SUNG-WON
  • LEE, SANG-JOON
  • HWANG, TAE-WON

Assignees

  • LG Energy Solution, Ltd.

Dates

Publication Date
20260506
Application Date
20241212

Claims (9)

  1. A battery pack comprising: a case providing an inner space and having a pack cover; a battery cell positioned inside the case; a partition wall configured to partition the inner space of the case; an adhesive member disposed on the partition wall; and a bolt having a head attached to the adhesive member and a body penetrating the pack cover.
  2. The battery pack according to claim 1, further comprising: a nut located at an outer side of the pack cover and fastened to the bolt.
  3. The battery pack according to claim 1, wherein the pack cover is in contact with the head.
  4. The battery pack according to claim 1, wherein the head is configured to separate from the partition wall when a thermal event occurs.
  5. The battery pack according to claim 1, wherein the partition wall has an accommodation groove formed at a top end, and wherein the adhesive member is disposed in the accommodation groove.
  6. The battery pack according to claim 1, wherein the head has a through hole, and wherein the adhesive member is filled in the through hole.
  7. The battery pack according to claim 6, further comprising: a stopper attached to an upper surface of the head and configured to cover the through hole.
  8. The battery pack according to claim 1, further comprising: a gasket disposed between the head and the pack cover.
  9. A vehicle comprising the battery pack according to any one of claims 1 to 8.

Description

TECHNICAL FIELD The present disclosure relates to a battery pack. The present application claims priority to Korean Patent Application No. 10-2024-0070922 filed on May 30, 2024 in the Republic of Korea, the disclosure of which is incorporated herein by reference. BACKGROUND ART As the demand for portable electronic products such as smartphones, tablet PCs, and smart watches increases significantly and electric vehicles become increasingly widespread, research is being actively conducted on batteries installed in these vehicles, especially secondary batteries that allow repeated charging and discharging. Currently, commercially available secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, lithium secondary batteries and the like, and among them, lithium secondary batteries have little or no memory effect, and thus they are gaining more attention than nickel-based secondary batteries for their advantages that recharging can be done whenever it is convenient, the self-discharge rate is very low and the energy density is high. Lithium secondary batteries primarily comprise lithium-based oxides and carbon materials for a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly including a positive electrode plate and a negative electrode plate coated with the positive electrode active material and the negative electrode active material, respectively, with a separator interposed between the positive electrode plate and the negative electrode plate, and a sealed packaging or battery case accommodating the electrode assembly together with an electrolyte solution. In general, lithium secondary batteries may be classified into can-type secondary batteries in which the electrode assembly is included in a metal can and pouch-type secondary batteries in which the electrode assembly is included in a pouch of an aluminum laminate sheet, according to the shape of the battery case. Recently, secondary batteries have been widely used in medium and large devices such as electric vehicles and energy storage systems (ESSs) for driving and storing energy, as well as in small devices such as portable electronic devices. A plurality of secondary batteries may be electrically connected and stored inside a module case, thereby forming a battery module. At this time, each secondary battery included in one battery module may be referred to as a battery cell. In addition, multiple battery modules may be connected to each other to form a battery pack. However, if a plurality of battery modules are included in the battery pack as above and each battery module includes a plurality of battery cells, the battery pack may be vulnerable to a thermal chain reaction between battery modules or between battery cells. For example, if an event such as thermal runaway occurs within one battery module, the thermal runaway needs to be prevented from propagating to other battery modules or other battery cells. If the propagation of thermal runaway between battery modules or battery cells is not properly prevented, an event occurring in a specific battery module or battery cell may cause a thermal chain reaction in other battery modules or other battery cells, which may cause an explosion or fire or enlarge the scale thereof. In particular, when an event such as thermal runaway occurs in one battery module, gas or flame may be randomly discharged to the outside. At this time, if the discharge of gas or flame is not properly controlled, the gas or flame may be discharged toward other battery modules, which may cause a thermal chain reaction in other battery modules. In particular, a module terminal may exist on the front side of the battery module, and a configuration, such as a module bus bar, may exist for electrical connection with other battery modules or battery packs. Accordingly, if flame is discharged to the front side of the battery module, the module terminals may be damaged and an electrical short may occur within the battery pack. In addition, since other battery modules may exist on the front side of the battery module, if flame is discharged to the front side of a specific battery module, the discharged flame may be directed to other battery modules, which may easily cause a fire to spread between battery modules. If the thermal propagation between battery modules or battery cells are not properly controlled, it may result in a sudden voltage drop in the battery module or battery pack. This may cause a sudden shutdown of the device equipped with the battery module or battery pack, resulting in unexpected damage. For example, if a sudden voltage drop in the battery pack occurs while an electric vehicle is in operation, there is no time to move the electric vehicle to a safe location. Moreover, if a fire or explosion occurs suddenly due to failure to properly control thermal propagation between batte