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EP-4220832-B1 - BATTERY PACK

EP4220832B1EP 4220832 B1EP4220832 B1EP 4220832B1EP-4220832-B1

Inventors

  • KIM, Dooseung
  • YANG, JAEHUN
  • LEE, JUNG HOON
  • KIM, SEHO
  • PARK, JEONG GI

Dates

Publication Date
20260506
Application Date
20220906

Claims (11)

  1. A battery pack (1000) comprising: a lower pack frame (1100) on which a plurality of battery modules are mounted; an upper pack frame (1200) located in the upper part of the plurality of battery modules; and a rigid beam (1170) included in the lower pack frame (1100), wherein the rigid beam (1170) comprises at least one reinforcing member (2000) that comprises a viscous damper (2100) or a viscoelastic damper (2500), wherein the rigid beam (1170) is formed of a hollow structure, wherein the reinforcing member (2000) is located inside the rigid beam (1170), and wherein fastening parts (2140) located at both ends of the reinforcing member (2000) are located while being in contact with an inner surface of the rigid beam (1170).
  2. The battery pack (1000) according to claim 1 wherein: two or more reinforcing members (2000) are disposed in the rigid beam (1170).
  3. The battery pack (1000) according to claim 1 wherein: the lower pack frame (1100) comprises a bottom part on which the plurality of battery modules are mounted, side surface frames (1150) that are extended along each edge of the bottom surface of the lower pack frame (1100), and one or more inner beam (1110) that partitions an interior of the lower pack frame (1100).
  4. The battery pack (1000) according to claim 3 wherein: when the inner beams (1110) are provide as a plurality, each of at least two of the inner beams (1110) includes the rigid beam (1170).
  5. The battery pack (1000) according to claim 4, further comprising an additional beam (1130) located while being in contact with the inner beam (1110).
  6. The battery pack (1000) according to claim 3 wherein: the rigid beam (1170) is included in the side surface frame (1150).
  7. The battery pack (1000) according to claim 6, further comprising an additional beam (1130) located while being in contact with one surface of the side surface frame (1150).
  8. The battery pack (1000) according to claim 7 wherein: one surface of the additional beam (1130) is in contact with the bottom part, and another surface of the additional beam (1130) is located while being in contact with the side surface frame (1150).
  9. The battery pack (1000) according to claim 1 wherein: the lower pack frame (1100) comprises a bottom part on which the plurality of battery modules are mounted, side surface frames (1150) that are extended along each edge of the bottom surface of the lower pack frame (1100), and an inner beam (1110) that partitions an interior of the lower pack frame (1100), and the rigid beam (1170) is weld-coupled with at least one of the side surface frame (1150) and the inner beam (1110).
  10. The battery pack (1000) according to claim 1 wherein: the reinforcing member (2000) is located vertically on the basis of the bottom part of the lower pack frame (1100).
  11. The battery pack (1000) according to claim 1 wherein: the reinforcing member (2000) is located horizontally on the basis of the bottom part of the lower pack frame (1100).

Description

[TECHNICAL FIELD] Cross Citation with Related Application(s) This application claims the benefit of Korean Patent Application No. 10-2021-0124084 filed on September 16, 2021 with the Korean Intellectual Property Office. The present disclosure relates to a battery pack, and more particularly to a battery pack that reinforces rigidity and can flexibly cope with external vibrations and impacts. [BACKGROUND] Secondary batteries, which are easily applied to various product groups and has electrical characteristics such as high energy density, are universally applied not only for a portable device but also for an electric vehicle or a hybrid electric vehicle, an energy storage system or the like, which is driven by an electric driving source. Such secondary battery is attracting attention as a new environment-friendly energy source for improving energy efficiency since it gives a primary advantage of remarkably reducing the use of fossil fuels and also does not generate by-products from the use of energy at all. Currently commercialized secondary batteries include a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, and a lithium secondary battery. Among them, the lithium secondary battery has come into the spotlight because they have advantages, for example, hardly exhibiting memory effects compared to nickel-based secondary batteries and thus being freely charged and discharged, and having very low self-discharge rate and high energy density. Generally, the lithium secondary battery may be classified based on the shape of the exterior material into a cylindrical or prismatic secondary battery in which the electrode assembly is mounted in a metal can, and a pouch-type secondary battery in which the electrode assembly is mounted in a pouch made of an aluminum laminate sheet. Recently, along with a continuous rise of the necessity for a large-capacity secondary battery structure, including the utilization of the secondary battery as an energy storage source, there is a growing demand for a battery pack of a medium- and large-sized module structure which is an assembly of battery modules in which a plurality of secondary batteries are connected in series or in parallel. In such a battery module, a plurality of battery cells are connected to each other in series or in parallel to form a battery cell stack, thereby improving capacity and output. In addition, a plurality of battery modules may be mounted together with various control and protection systems such as a BMS (battery management system) and a cooling system to form a battery pack. However, the battery pack is composed of a structure in which a large number of battery modules are combined, and thus it may be heavy. In this case, there is a problem that it is not suitable for loading a plurality of batteries on a moving means such as an automobile. Fig. 1 is a diagram showing a battery pack frame of a conventional battery pack. A typical battery pack frame 10 may include a side surface frame 150 extending along the edge of the lower pack frame and at least two inner beams 110 that partition the inside of the lower pack frame while being in contact with the inner surface of the side surface frame 150. The battery pack frame 10 may be formed of a metal material. In this case, there is a limit in absorbing vibration or impact applied from the outside, which may lead to a reduction of durability and stability of the battery pack. When increasing the thickness of the battery pack frame 10 to overcome this problem, the durability and stability can be improved, but the volume and weight of the battery itself may increase. Therefore, in comparison with the general battery pack 10, only a small number of batteries can be mounted in a device such as an automobile, and thus, energy required for driving the device cannot be provided. Therefore, in order to overcome the above-mentioned problems, there is a need to apply a battery pack structure that not only absorbs vibrations or impacts applied from the outside to increase the durability and stability of the battery pack, but also does not decrease the energy density of the battery. The prior art relevant to the present invention is given by WO 2021/034420 A1, EP 3 528 305 A1 and KR 2019 0088802 A. It is known from the prior art a modular composite battery enclosure containing multiple individual composite structures attached together. The individual composite structures form covers that enclose an open area for housing a battery system of battery cells and cooling devices. The composite battery enclosures are lightweight and made of materials that can function to absorb energy and insulate the battery housing area. The composite structures contain a core material adhered and sandwiched between fiber layers. [DETAILED DESCRIPTION OF THE INVENTION] [Technical Problem] The present disclosure has been designed to solve the above-mentioned problems and an object of the present disclosure is to provide