EP-4742377-A1 - BATTERY PACK AND VEHICLE COMPRISING BATTERY PACK

Abstract

Disclosed is a battery pack, which includes a plurality of battery cells; a cell frame configured to accommodate the plurality of battery cells; a first filling member filled between the plurality of battery cells within the cell frame; and a second filling member filled within the cell frame to be in contact with the first filling member.

Inventors

• LIM, JEONG-HOON
• LEE, YOUNG-KYU

Assignees

• LG Energy Solution, Ltd.

Dates

Publication Date

20260513

Application Date

20250113

Claims (18)

1. A battery pack comprising: a plurality of battery cells; a cell frame configured to accommodate the plurality of battery cells; a first filling member filled between the plurality of battery cells within the cell frame; and a second filling member filled within the cell frame to be in contact with the first filling member.
2. The battery pack according to claim 1, wherein the second filling member is filled to cover the first filling member so that the first filling member is sealed within the cell frame.
3. The battery pack according to claim 1, wherein the first filling member is filled so that a part of the plurality of battery cells is immersed within the cell frame, and wherein the second filling member is filled so that the remaining part of the plurality of battery cells is immersed within the cell frame.
4. The battery pack according to claim 1, wherein the cell frame includes: a frame body configured to accommodate the plurality of battery cells; and a frame cover coupled with the frame body and configured to cover an upper side of the plurality of battery cells, wherein the first filling member is filled to a height equal to or lower than a height of an upper end of the frame body.
5. The battery pack according to claim 4, wherein the second filling member is continuously filled from the frame cover to a part within the frame body where the second filling member comes into contact with the first filling member.
6. The battery pack according to claim 1, wherein the first filling member contains a phase change material.
7. The battery pack according to claim 1, wherein the first filling member contains a paraffin material.
8. The battery pack according to claim 1, wherein the second filling member is made of the same material as the first filling member.
9. The battery pack according to claim 1, wherein the second filling member is made of a glass bead resin.
10. The battery pack according to claim 1, wherein the second filling member is made of silicone foam.
11. The battery pack according to claim 4, wherein the frame cover includes: a cover body coupled with the frame body; and a guide protrusion extending from an edge of the cover body to a predetermined height, wherein the second filling member is filled up to an end of the guide protrusion.
12. The battery pack according to claim 1, wherein the frame cover includes a cell insert portion formed on the cover body so that an end of the plurality of battery cells is inserted therein.
13. The battery pack according to claim 1, further comprising: a heatsink provided at one side of the cell frame to cool the plurality of battery cells.
14. The battery pack according to claim 13, wherein an opening for exposing an end of the plurality of battery cells toward the heatsink is formed at one side of the cell frame facing the heatsink.
15. The battery pack according to claim 13, further comprising: an adhesive member provided between the cell frame and the heatsink to seal the first filling member together with the second filling member.
16. The battery pack according to claim 11, further comprising: a bus bar assembly mounted on the cover body at a bottom portion of the guide protrusion and electrically connected to the plurality of battery cells.
17. The battery pack according to claim 16, wherein the second filling member is filled to cover the bus bar assembly.
18. A vehicle comprising at least one battery pack according to any one of claims 1 to 17.

Description

TECHNICAL FIELD The present disclosure relates to a battery pack and a vehicle including the battery pack, and more particularly, to a battery pack with improved cooling performance and safety and a vehicle including the battery pack. This application is based on and claims priority from Korean Patent Application No. 10-2024-0042000, filed on March 27, 2024, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. BACKGROUND ART Secondary batteries which are highly applicable to various products and exhibit superior electrical properties such as high energy density, etc. are commonly used not only in portable devices but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electrical power sources. The secondary battery is drawing attentions as a new energy source for enhancing energy efficiency and environment friendliness in that the use of fossil fuels can be reduced greatly and no byproduct is generated during energy consumption. Secondary batteries widely used at present include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries and the like. An operating voltage of the unit secondary battery cell, namely a unit battery cell, is about 2.5V to 4.2V. Therefore, if a higher output voltage is required, a plurality of battery cells may be connected in series to configure a battery pack. In addition, depending on the charge/discharge capacity required for the battery pack, a plurality of battery cells may be connected in parallel to configure a battery pack. Thus, the number of battery cells included in the battery pack may be variously set according to the required output voltage or the demanded charge/discharge capacity. Recently, in the case of battery packs, the demand for large-capacity battery packs as a collection of a plurality of battery cells is increasing in order to secure capacity. In the case of such large-capacity battery packs, securing cooling performance is considered more important. In addition, in terms of securing the safety of battery packs, which has been considered more important recently, a structure that prevents heat transfer to adjacent battery cells when a situation such as thermal runaway of a specific battery cell occurs is also emerging as an important design factor. Therefore, there is a need to find a way to provide a battery pack that may secure safety by increasing cooling performance and preventing heat transfer to adjacent battery cells when a situation such as thermal runaway of a specific battery cell occurs, and a vehicle including the same. DISCLOSURE Technical Problem Therefore, the present disclosure is directed to providing a battery pack capable of improving cooling performance, and a vehicle including the battery pack. In addition, the present disclosure is also directed to providing a battery pack capable of improving safety by preventing heat transfer, and a vehicle including the battery pack. Moreover, the present disclosure is also directed to providing a battery pack capable of improving manufacturing efficiency, and a vehicle including the battery pack. However, the technical problems that the present disclosure seeks to solve are not limited to the above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description. Technical Solution In one aspect of the present disclosure, there is provided a battery pack comprising: a plurality of battery cells; a cell frame configured to accommodate the plurality of battery cells; a first filling member filled between the plurality of battery cells within the cell frame; and a second filling member filled within the cell frame to be in contact with the first filling member. Also, preferably, the second filling member may be filled to cover the first filling member so that the first filling member is sealed within the cell frame. Also, preferably, the first filling member may be filled so that a part of the plurality of battery cells is immersed within the cell frame, and the second filling member may be filled so that the remaining part of the plurality of battery cells is immersed within the cell frame. Also, preferably, the cell frame may include a frame body configured to accommodate the plurality of battery cells; and a frame cover coupled with the frame body and configured to cover an upper side of the plurality of battery cells, and the first filling member may be filled to a height equal to or lower than a height of an upper end of the frame body. Also, preferably, the second filling member may be continuously filled from the frame cover to a part within the frame body where the second filling member comes into contact with the first filling member. Also, preferably, the first filling member may contain a phase change material. Also, preferably, the first filling member may contain a pa