KR-102962890-B1 - Battery pack including an insulating sheet with through-holes formed

Abstract

The present invention relates to a battery pack comprising a plurality of cylindrical battery cells, a heat sink located below the plurality of cylindrical battery cells to dissipate heat generated from the cylindrical battery cells, an insulating sheet located between the cylindrical battery cells and the heat sink to block electrical connection between the cylindrical battery cells and the heat sink, and an adhesive layer applied on the insulating sheet to bond the cylindrical battery cells and the insulating sheet, wherein the insulating sheet is characterized by having a plurality of through holes formed in the empty space between the plurality of cylindrical battery cells.

Inventors

• 이영규
• 손영수
• 이범직
• 안지명

Assignees

• 주식회사 엘지에너지솔루션

Dates

Publication Date

20260508

Application Date

20201029

Claims (11)

1. Multiple cylindrical battery cells; A heat sink located at the bottom of the plurality of cylindrical battery cells to dissipate heat generated from the cylindrical battery cells; An insulating sheet positioned between the cylindrical battery cell and the heat sink to block the electrical connection between the cylindrical battery cell and the heat sink; and A battery pack comprising an adhesive layer formed on the insulating sheet to fix the cylindrical battery cell, wherein The above insulating sheet has a plurality of through holes formed in the empty space between the plurality of cylindrical battery cells, and A battery pack characterized in that the adhesive layer is a thermally conductive adhesive layer that is filled and cured in the through hole, and the adhesive layer and the heat sink are in direct contact.
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3. A battery pack according to claim 1, characterized in that the thermally conductive adhesive layer is a layer formed from any one of a thermally conductive epoxy adhesive, a thermally conductive silicone adhesive, and a thermally conductive urethane adhesive.
4. A battery pack according to claim 1, characterized in that the insulating sheet is a polycarbonate sheet.
5. A battery pack according to claim 1, wherein the heat sink is an aluminum plate.
6. A battery pack according to claim 5, characterized in that the heat sink has a flow path formed therein for the flow of refrigerant.
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8. A method for manufacturing a battery pack with enhanced adhesion between an insulating sheet and a heat sink, A step of adhering the insulating sheet having a plurality of through holes formed in the heat sink; A step of applying adhesive onto the insulating sheet; A step of positioning a plurality of cylindrical battery cells on the applied adhesive and then pressing them toward the heat sink to secure them; The step of curing the above adhesive; comprising, A method for manufacturing a battery pack characterized in that the adhesive is a thermally conductive adhesive, and in the step of applying the adhesive, the adhesive is filled and cured in the through hole so that the adhesive and the heat sink come into direct contact.
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11. A device comprising a battery pack according to any one of paragraphs 1, 3 through 6.

Description

Battery pack including an insulating sheet with through-holes formed The present invention relates to a battery pack that improves the adhesion between an insulating sheet and a heat sink by applying an insulating sheet having a plurality of through holes. With the increasing technological development and demand for mobile devices such as smartphones, laptops, and digital cameras, technologies related to rechargeable secondary batteries are becoming more active. Furthermore, secondary batteries are being applied to electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), and energy storage devices (ESS) as alternative energy sources to fossil fuels that cause air pollutants. Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, or unit battery cells, is approximately 2.0V to 5.0V. Therefore, if a higher output voltage is required, multiple battery cells may be connected in series to form a cell module assembly, and cell module assemblies may also be connected in series or parallel to form a battery module according to the required output voltage or charge/discharge capacity. It is common practice to manufacture a battery pack by adding additional components using at least one of these battery modules. Since these battery packs are manufactured with densely packed battery cells considering factors such as energy density, it is important to easily dissipate the heat generated from each battery cell. Therefore, it is common for battery packs to be equipped with cooling devices such as heat sinks, and it is common to form an oxide film on the surface of such heat sinks to prevent corrosion. In particular, in the case of a battery pack composed of cylindrical battery cells, the heat sink and the cylindrical battery cells are bonded through a process in which a thermally conductive adhesive is applied to the heat sink, the cylindrical battery cells are placed on top, and then cured. However, voids may be formed due to poor application of the thermally conductive adhesive or the generation of bubbles, and in this case, there is a problem where a short circuit may occur due to direct contact between the battery cell and the heat sink. To prevent such short circuits, an insulating sheet is sometimes provided between the heat sink and the cylindrical battery cell. FIG. 1 is a cross-sectional view showing a portion of the cross-section of a battery pack including a cylindrical battery cell and an insulating sheet according to the prior art, and FIG. 2 is a cross-sectional view showing the phenomenon of separation of the adhesion between the heat sink and the insulating sheet in a battery pack with an insulating sheet applied according to the prior art. Referring to FIGS. 1 and 2, a conventional battery pack comprises a thermally conductive insulating sheet (3) provided on a heat sink (4), a thermally conductive adhesive layer (2) formed on the insulating sheet (3), and a plurality of cylindrical battery cells (1) fixed to the thermally conductive adhesive layer (2). The battery pack formed in this way has the advantage of ensuring insulation between the cylindrical battery cell (1) and the heat sink (4), but when the insulating sheet (3) is attached to the heat sink (4), an adhesive in the form of an adhesive tape with a very thin thickness of about 0.1 mm is used in consideration of thermal conductivity, and such an adhesive tape generally has a relatively low adhesion strength to the heat sink (4) formed of a metal material compared to the insulating sheet (3) formed of a polymer material. Therefore, in conventional battery packs, the adhesion between the heat sink (4) and the insulating sheet (3) is much lower than the adhesion between the insulating sheet (3) and the thermally conductive adhesive layer (2), so there is a problem in that the adhesion between the insulating sheet (3) and the heat sink (4) is separated due to mechanical impact during the manufacturing and transportation of the battery pack, as shown in FIG. 2. FIG. 1 is a cross-sectional view showing a portion of the cross-section of a battery pack including a cylindrical battery cell and an insulating sheet according to the prior art. FIG. 2 is a cross-sectional view illustrating the phenomenon in which the adhesion between the heat sink and the insulating sheet is separated in a battery pack with an insulating sheet applied according to the prior art. FIG. 3 is a cross-sectional view showing a portion of the cross-section of a battery pack including an insulating sheet having through holes formed therein according to one embodiment of the present invention. FIG. 4 is a plan view showing an insulating sheet with through holes formed therein according to another embodiment of the present invention. In this applica