Search

EP-4293800-B1 - BATTERY MODULE, BATTERY PACK, AND VEHICLE INCLUDING THE BATTERY PACK

EP4293800B1EP 4293800 B1EP4293800 B1EP 4293800B1EP-4293800-B1

Inventors

  • YUN, Hyun-seop
  • YANG, JAE-HUN

Dates

Publication Date
20260506
Application Date
20230127

Claims (13)

  1. A battery module (10) comprising: a cell assembly (100) comprising a plurality of battery cells (110); and a compression pad assembly (300) located between the plurality of battery cells, the compression pad assembly comprising a heat blocking unit (310) in which at least one hollow portion (S) is formed; wherein the heat blocking unit (310) comprises a body portion (312) formed of a metal material, wherein the body portion (310) is manufactured through extrusion, and wherein the at least one hollow portion (S) is formed in the body portion (312) through extrusion and extends long in an extrusion direction in the body portion (310), and wherein the body portion (312) is located between the plurality of battery cells (110).
  2. The battery module (10) according to claim 1, wherein the compression pad assembly (300) is configured to closely contact facing battery cells (110) in a stacking direction of the plurality of battery cells (110).
  3. The battery module (10) according to claim 1, wherein an air layer is formed in the at least one hollow portion (S).
  4. The battery module (10) according to any one of claims 1 to 3, wherein the heat blocking unit (310) further comprises a coating portion (314) provided on both side surfaces of the body portion (312) in a stacking direction of the plurality of battery cells (110) and configured to block a flame due to thermal runaway of the cell assembly (100).
  5. The battery module (10) according to claim 4, wherein the compression pad assembly (300) further comprises a compression pad (320) provided on the coating portion (314) in the stacking direction of the plurality of battery cells (110) and configured to closely contact facing battery cells (110) in the stacking direction of the plurality of battery cells (110).
  6. The battery module (10) according to claim 1, wherein the hollow portion (S) extends in an up-down direction of the plurality of battery cells (110), in the body portion (312).
  7. The battery module (10) according to claim 5, further comprising a heat blocking member (700) located between the compression pad (320) and a battery cell (110) facing the compression pad (320), in the stacking direction of the plurality of battery cells (110).
  8. The battery module (10) according to claim 1, wherein the hollow portion (S) is included as a single layer in the compression pad assembly (300).
  9. The battery module (10) according to claim 1, wherein the hollow portion extends in a longitudinal direction of the battery cell, and a plurality of hollow portions (S) are included in the compression pad assembly (300) while being spaced apart from each other.
  10. The battery module according to claim 9, wherein the plurality of hollow portions (S) are regularly arranged by controlling a size of each hollow portion (S) and an interval between the hollow portions (S).
  11. The battery module according to claim 4, wherein the coating portion (314) comprises a ceramic coating layer formed of only an inorganic material, without an organic material.
  12. A battery pack (800) comprising a plurality of battery modules (10) according to any one of claims 1 to 11.
  13. A vehicle (900) comprising at least one battery pack according to claim 12.

Description

TECHNICAL FIELD The present disclosure relates to a battery module, a battery pack, and a vehicle including the battery pack, and more particularly, to a battery module configured to ensure structural stability even when a thermal event occurs, a battery pack, and a vehicle including the battery pack. The present application claims priority to Korean Patent Application Nos. 10-2022-0050987 and 10-2023-0009762, respectively filed on April 25, 2022 and January 25, 2023 in the Republic of Korea. BACKGROUND ART As the demand for portable electronic products such as laptops, video cameras, and mobile phones has recently rapidly increased and the development of electric vehicles, energy storage batteries, robots, satellites, etc. has begun in earnest, research on high-performance secondary batteries capable of repeated charge/discharge has been actively conducted. Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries are in the spotlight because they have almost no memory effect compared to nickel-based secondary batteries, and thus, have advantages of free charge/discharge, very low self-discharge rate, and high energy density. A lithium secondary battery mainly uses a lithium-based oxide and a carbon material as a positive electrode active material and a negative electrode active material, respectively. Also, a lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate to which a positive electrode active material and a negative electrode active material are respectively applied are located with a separator therebetween, and a casing in which the electrode assembly is sealed and accommodated along with an electrolyte. According to a shape of a battery case, lithium secondary batteries may be classified into can-type secondary batteries in which an electrode assembly is received in a metal can, and pouch-type secondary batteries in which an electrode assembly is received in a pouch of an aluminum laminate sheet. Can-type secondary batteries may be classified into cylindrical batteries and prismatic batteries according to a shape of a metal can. A pouch of a pouch-type secondary battery may be largely divided into a lower sheet and an upper sheet covering the lower sheet. In this case, an electrode assembly formed by stacking and/or winding a positive electrode, a negative electrode, and a separator is accommodated in the pouch. After the electrode assembly is accommodated, edges of the upper sheet and the lower sheet are sealed to each other through thermal fusion or the like. Also, an electrode tab drawn out from each electrode may be coupled to an electrode lead, and an insulating film may be added to a portion of the electrode lead contacting a sealing portion. As such, a pouch-type secondary battery may be flexibly formed in various shapes. Also, a pouch-type secondary battery has the advantage of implementing a secondary battery of the same capacity with a smaller volume and mass. In order for a lithium secondary battery to provide high voltage and high current, a plurality of battery cells are overlapped or stacked by themselves or overlapped or stacked while mounted on a cartridge to form a dense structure, and then, are used as a battery module or a battery pack in which the battery cells are electrically connected. Safety is one of the most important issues in such a battery pack configuration. In particular, when a thermal event occurs in any one of a plurality of battery cells included in a battery pack, it is necessary to suppress propagation of the thermal event to other battery cells. When the propagation of the thermal event between battery cells is not appropriately suppressed, this may cause a thermal event of other battery cells included in the battery pack, thereby causing a bigger problem such as ignition or explosion of the battery pack. Furthermore, the ignition or explosion of the battery pack may cause great damage to surrounding people or property. Accordingly, in such a battery pack, a configuration capable of appropriately controlling a thermal event is required. EP3780254A1 relates to a power supply device including a plurality of battery cells. WO2019/167612A1 relates to a battery module provided with a plurality of batteries. WO2020/262080A1 relates to a power supply device equipped with a battery block. EP3641006A1 relates to a battery module and the technical field of energy storage. EP3896780A1 relates to a battery module including a plurality of battery. WO2020/137062A1 relates to a separator for establishing both formability and thermal insulation and for insulating adjacent battery cells. The separator is provided with a thermal insulation sheet and a forming member that has higher shape stability than the thermal insulation sheet. DISCLOSURE Technical Problem The pres