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EP-4742373-A2 - BATTERY PACK AND DEVICE INCLUDING THE SAME

EP4742373A2EP 4742373 A2EP4742373 A2EP 4742373A2EP-4742373-A2

Abstract

A battery pack according to one embodiment of the present disclosure includes a lower pack housing having a plurality of module regions, a thermal conductive resin layer applied to the lower pack housing within the module region, a plurality of battery cell stacks mounted in each of the plurality of module regions on the thermal conductive resin layer, and an upper pack housing for covering the plurality of battery cell stacks.

Inventors

  • PARK, SUBIN
  • SEONG, JUNYEOB
  • PARK, WON KYOUNG

Assignees

  • LG Energy Solution, Ltd.

Dates

Publication Date
20260513
Application Date
20210709

Claims (10)

  1. A battery pack (1000) comprising a pack frame (1100) including a lower pack housing (1110) and an upper pack housing (1120), a plurality of battery modules (100) disposed on the bottom portion (1111) of the lower pack housing (1110), a partition wall (135) formed between two adjacent battery modules (100) of the plurality of battery modules (100), a thermal conductive resin layer (1200) disposed between each battery module (100) of the plurality of battery modules (100) and the lower pack housing (1110), wherein the thermal conductive resin layer (1200) comprises a first thermally conductive resin layer and a second thermally conductive resin layer disposed separately from each other by the partition wall (135).
  2. The battery pack of claim 1, wherein the thermal conductive resin layer (1200) is formed by applying a thermal conductive resin to the bottom portion (1111) of the lower pack housing (1110).
  3. The battery pack of claim 1 or 2, wherein the thermally conductive resin layer (1200) includes a thermal conductive adhesive material.
  4. The battery pack of claim 3, wherein the thermal conductive adhesive material includes at least one of a silicone material, a urethane material, and an acrylic material.
  5. The battery pack of any one of claims 1 to 4, wherein each battery module (100) includes a battery cell stack (200) in which a plurality of battery cells (110) are stacked.
  6. The battery pack of claim 5, wherein each battery cell (110) of the plurality of the battery cells (100) includes two electrode leads (111, 112) and a cell body (113), the electrode leads (111, 112) are directed in reverse directions with reference to the cell body (113).
  7. The battery pack of claim 6, wherein the plurality of the battery cells (100) are stacked along a first direction (X-axis direction) and the electrodes leads (111, 112) protrudes along a second direction (Y-axis direction).
  8. The battery pack of any one of claims 1 to 7, wherein a heat sink structure is formed on the pack frame (1100).
  9. A vehicle comprising a battery pack as defined in any one of claims 1 to 8.
  10. The vehicle according to claim 9 being an electric bicycle, an electric vehicle and hybrid vehicle.

Description

[TECHNICAL FIELD] Cross Citation with Related Application(s) This application claims the benefit of Korean Patent Application No. 10-2020-0086792 filed on July 14, 2020 with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. The present disclosure relates to a battery pack and a device including the same, and more particularly, to a battery pack with increased productivity and a device including the same. [BACKGROUND ART] With the increase of the technological development and demand for a mobile device, demand for a secondary battery as an energy source is rapidly increasing, and accordingly, many researches of the battery capable of meeting a variety of needs are emerging. A secondary battery has attracted considerable attention as an energy source for power-driven devices, such as an electric bicycle, an electric vehicle, and a hybrid electric vehicle, as well as an energy source for mobile devices, such as a mobile phone, a digital camera, and a laptop computer. Small-sized mobile devices use one or several battery cells for each device, whereas middle or large-sized devices such as vehicles require high power and large capacity. Therefore, a middle or large-sized battery module having a plurality of battery cells electrically connected to one another is used. The middle or large-sized battery module is preferably produced so as to have as small a size and weight as possible. For this reason, a prismatic battery, a pouch-shaped battery or the like, which can be stacked with high integration and has a small weight relative to capacity, is usually used as a battery cell of the middle or large-sized battery module. Meanwhile, in order to protect the battery cell stack from external impact, heat or vibration, the battery module may include a module frame in which a front surface and back surface are opened to house the battery cell stack in an internal space. Fig. 1 is a perspective view showing a hole formed in a bottom portion of a frame in a conventional battery module. Fig. 2 is a perspective view showing a state in which the battery module of Fig. 1 is reversed upside down. Fig. 3 is a cross-sectional view taken along the cutting line A-A of Fig. 1. Fig. 4 is a diagram showing a state in which the battery module of Fig. 2 is combined with a heat sink. Referring to Figs. 1 to 3, in order to protect a battery cell stack 15 from external impact, heat or vibration, the battery module may include a module frame 10 of which a front surface and a back surface are opened so as to house the battery cell stack 15 in an internal space. The module frame 10 has a top portion 12 and a bottom portion 11. Referring to Fig. 1 showing a state in which the battery module of Fig. 2 is reversed upside down, a liquid injection hole 20 may be formed in the bottom portion 11 of the module frame 10. A thermal conductive resin can be injected between the battery cell stack 15 and the bottom portion 11 of the module frame 10 through the liquid injection hole 20 to form a thermal conductive resin layer 40 as shown in Fig. 3. The thermal conductive resin layer 40 may transfer heat generated in the battery cell stack 15 to the outside of the battery module. A checking hole 30 is further formed in the bottom portion 11 of the module frame 10. When injecting the thermal conductive resin, the thermal conductive resin injected more than necessary may be discharged to the outside of the battery module via the checking hole 30, thereby confirming the amount of injection. Fig. 1 shows a state in which the battery module is reversed by 180 degrees in order to inject a thermal conductive resin, wherein as shown in Fig. 3, the components inside the battery module may move downward due to gravity. A battery cell stack 15, which is an aggregate formed by stacking a plurality of battery cells 14, is mounted inside the battery module, and the battery cell stack 15 moves downward due to gravity. Therefore, the space where the thermal conductive resin can be injected is wider than the originally designed space. At this time, the thermal conductive resin is injected, and the amount of the thermal conductive resin that fills the space between the bottom portion 11 and the battery cell stack 15 can be increased more than necessary. Consequently, reverse discharge may occur or a quality problem of the battery module may occur due to non-curing. Referring to Fig. 4, the battery module of Fig. 2 can be combined with a heat sink 60 to cool the heat generated in the battery cells 14, thereby forming a battery pack. At this time, the heat sink 60 includes an inlet through which the refrigerant flows in, an outlet through which the refrigerant flows out, a lower plate 62 having a cooling flow path for connecting the inlet and the outlet, and an upper plate 61 for covering the lower plate 62. Here, a heat transfer member 50 may be further formed between the bottom portion 11 of the battery mod