KR-20260067112-A - BATTERY ASSEMBLY FOR PREVENTING THERMAL RUNAWAY

KR20260067112AKR 20260067112 AKR20260067112 AKR 20260067112AKR-20260067112-A

Abstract

A battery assembly for preventing thermal runaway according to the present invention comprises a plurality of battery cells, a battery pack that accommodates a plurality of electrically connected battery cells and protects the plurality of battery cells from the outside, and a battery cooling unit that is filled in the gap between the plurality of battery cells inside the battery pack and is mixed with a non-conductive water-based material and a superabsorbent resin; the battery cooling unit is filled in a gel shape and is characterized by preventing thermal runaway of an adjacent battery cell by utilizing latent heat when a fire occurs in at least one of the plurality of battery cells.

Inventors

박종훈
신윤호

Assignees

주식회사 뉴로메카

Dates

Publication Date: 20260512
Application Date: 20241105

Claims (11)

Multiple battery cells and; A battery pack that accommodates a plurality of electrically connected battery cells and protects the plurality of battery cells from the outside; It includes a battery cooling section filled in the gap between a plurality of battery cells inside the battery pack, and comprising a mixture of a non-conductive aqueous material and a superabsorbent resin; A battery assembly for preventing thermal runaway, wherein the battery cooling portion is filled with a gel shape and utilizes latent heat to prevent thermal runaway of adjacent battery cells when a fire occurs in at least one of the plurality of battery cells.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit maintains the temperature inside the battery pack at 100 degrees or less by utilizing the latent heat of evaporation of the non-conductive aqueous material.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit is filled into the gap between a plurality of battery cells to protect the plurality of battery cells from external temperature changes.
In paragraph 3, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit blocks heat transfer between the rise in external temperature and the plurality of battery cells when the external temperature rises above a certain level, thereby preventing overheating of the plurality of battery cells.
In paragraph 3, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit prevents the freezing of multiple battery cells by blocking heat transfer between the external negative temperature drop and multiple battery cells when the external temperature drops to a negative temperature below a certain level.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit prevents electrolysis and corrosion of a plurality of the battery cells.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit provides a flame-retardant function in the gap between other battery cells to prevent thermal runaway when a fire occurs in at least one of the plurality of battery cells.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit is formed by filling a single superabsorbent resin into the gaps between a plurality of battery cells and then impregnating it with a non-conductive aqueous material.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit is formed by filling a plurality of the battery cell gaps with a plurality of the superabsorbent resins and then impregnating the non-conductive aqueous material.
In paragraph 1, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit has a filling amount of -10% to 50% relative to the weight of a plurality of battery cells.
In Paragraph 10, A battery assembly for preventing thermal runaway, characterized in that the battery cooling unit has a filling amount of 22% to 28% relative to the weight of a plurality of battery cells.

Description

Battery Assembly for Preventing Thermal Runaway The present invention relates to a battery assembly for preventing thermal runaway, and more specifically, to a battery assembly for preventing thermal runaway that minimizes heat transfer to adjacent battery cells when a fire occurs in at least one of a plurality of battery cells. Batteries are broadly classified into primary batteries, which are used once, and secondary batteries, which undergo repeated charging and discharging cycles. Generally, secondary batteries are widely used in electronic devices where portability is emphasized, such as smartphones. Recently, the automotive industry has seen an increase in the production of automobiles using secondary batteries as an energy source in order to improve environmental pollution caused by by-products such as soot resulting from the reaction of fossil fuels in internal combustion engines, moving away from the production of automobiles using internal combustion engines that use fossil fuels as an energy source. Vehicles using such secondary batteries are broadly classified into pure battery vehicles (BEV; Battery Electric Vehicle - hereinafter referred to as 'electric vehicles') and plug-in hybrid electric vehicles (PHEV; Plug in Hybrid Electric Vehicle) that are equipped with small-capacity secondary batteries and use an internal combustion engine together. In addition, AGVs (Autonomous Guided Vehicles) and AMRs (Autonomous Mobile Robots) that transport logistics through autonomous driving in the logistics industry are equipped with secondary batteries, just like electric vehicles, and drive using electric energy provided from the secondary batteries. Lithium iron phosphate batteries (LFP) or lithium-ion batteries (NCM, NCA, etc.) are used in electric vehicles, plug-in hybrid vehicles, and autonomous robots as described above. Specifically, the secondary battery consists of multiple battery packs containing multiple battery cells. Meanwhile, when a fire occurs in at least one of the multiple battery cells contained in the battery pack, heat transfer to adjacent battery cells may occur, leading to an explosion, that is, a thermal runaway corresponding to the successive explosion of multiple battery cells. However, the progression time of thermal runaway due to heat transfer from multiple battery cells is very rapid, so there is an increasing need to slow down or block the speed of thermal runaway until firefighting equipment or fire departments can provide firefighting support. FIG. 1 is a first configuration diagram of a battery assembly for preventing thermal runaway according to an embodiment of the present invention, FIG. 2 is a second configuration diagram of a battery assembly for preventing thermal runaway according to an embodiment of the present invention, FIG. 3 is a graph showing the temperature trend of a plurality of battery cells according to the operation of the battery assembly for preventing thermal runaway shown in FIG. 1 and 2, FIG. 4 is a perspective view of a battery assembly for preventing thermal runaway to conduct a thermal runaway experiment, FIG. 5 is a plan view of a battery assembly for preventing thermal runaway shown in FIG. 4, Figure 6 is a table of test results comparing the control group and the experimental group of the battery assembly for preventing thermal runaway according to an embodiment of the present invention. Hereinafter, a battery assembly for preventing thermal runaway according to an embodiment of the present invention will be described in detail with reference to the attached drawings. Before proceeding with the explanation, it should be noted that the experiment was conducted by dividing into a control group and an experimental group to demonstrate the excellent functional effects of the battery assembly for preventing thermal runaway according to an embodiment of the present invention. FIG. 1 is a first configuration diagram of a battery assembly for preventing thermal runaway according to an embodiment of the present invention, FIG. 2 is a second configuration diagram of a battery assembly for preventing thermal runaway according to an embodiment of the present invention, and FIG. 3 is a graph showing the temperature trend of a plurality of battery cells according to the operation of the battery assembly for preventing thermal runaway shown in FIG. 1 and 2. As illustrated in FIGS. 1 to 3, a battery assembly (1) for preventing thermal runaway according to an embodiment of the present invention includes a battery cell (10), a battery pack (50), and a battery cooling unit (70). Additionally, a battery assembly (1) for preventing thermal runaway according to an embodiment of the present invention further includes an electrode connection unit (30). A plurality of battery cells (10) are used. Although the battery cells (10) are illustrated as cylindrical battery cells (10) as an embodiment of the present invention, they are not limited thereto and may be prismatic