KR-102962580-B1 - BATTERY PACK AND DEVICE INCLUDING THE SAME

KR102962580B1KR 102962580 B1KR102962580 B1KR 102962580B1KR-102962580-B1

Abstract

A battery pack according to one embodiment of the present invention comprises: a battery cell assembly in which a plurality of battery cell units are stacked; a pack tray on which the battery cell assembly is mounted; a pack cross beam located on one side of the battery cell assembly on the pack tray and having a gas passage provided therein; and a venting unit located on the upper side of the battery cell assembly. The battery cell unit comprises at least one battery cell and a cell cover that partially encloses at least one battery cell, and at least one venting portion is formed in the cell cover. The venting unit comprises a plurality of venting channels that guide gas ejected from the venting portion to the gas passage, and each of the venting channels is positioned to correspond to each of the battery cell units.

Inventors

박진용
이명우
권우용
지호준
김승준
정세윤
김인수

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260508
Application Date: 20230711
Priority Date: 20220720

Claims (17)

A battery cell assembly in which multiple battery cell units are stacked; A pack tray on which the above battery cell assembly is mounted; A pack cross beam located on one side of the battery cell assembly on the pack tray and having a gas passage provided inside; and A venting unit located on the upper part of the battery cell assembly; comprising, The above battery cell unit includes at least one battery cell and at least one cell cover that partially covers the battery cell, and At least one venting portion is formed in the cell cover above, and The above venting unit includes a plurality of venting channels that guide gas ejected from the venting section to the gas passage, and Each of the above venting channels is a battery pack positioned to correspond to each of the above battery cell units.
In paragraph 1, A battery pack having an independent venting space that is not shared among the above venting channels.
In paragraph 1, The above venting channels are a battery pack partitioned by a partition inside the venting unit.
In paragraph 1, The above-mentioned venting channel is a battery pack that extends along the length direction of the battery cell unit, which is perpendicular to the direction in which the battery cell unit is stacked.
In paragraph 1, Each of the above venting channels is a battery pack that communicates one-to-one with each of the above battery cell units.
In paragraph 1, The above cell cover is a battery pack with an open bottom side.
In paragraph 1, The cell cover above includes an upper surface and side portions, and A battery pack having at least one venting portion formed on the upper surface.
In paragraph 1, The above venting portion is a battery pack in which a part of the cell cover is in the form of a hole.
In paragraph 1, The above venting portion is a battery pack in which a part of the cell cover has weaker rigidity than an adjacent part and ruptures when a force or heat exceeding a certain pressure is applied.
In paragraph 1, The above venting unit is a battery pack comprising inlets communicating with the above venting section.
In Paragraph 10, A battery pack having a mesh structure in the inlet above.
In paragraph 1, A connection part is formed on either the above-mentioned venting unit or the above-mentioned pack cross beam, and a connection hole is formed on the other one that is coupled to the connection part, and Each of the above connection parts is a battery pack that communicates one-to-one with each of the above venting channels.
In Paragraph 12, A battery pack in which the above connection parts are inserted one-to-one into the corresponding connection holes and combined.
In Paragraph 12, A battery pack having a rupture disc structured to rupture at a pressure greater than a certain pressure inside at least one of the above-mentioned connection portion or the above-mentioned connection hole.
In Paragraph 12, The above venting channel is a battery pack that communicates with the gas passage of the pack cross beam through the above connection part and the above connection hole.
In Paragraph 15, The above-mentioned pack cross beam includes a plurality of mesh sections that partition the gas passage, and The above mesh sections are battery packs located at points between the connection sections along the length direction of the pack cross beam.
A device including a battery pack according to paragraph 1.

Description

Battery pack and device including the same Cross-citation with related application(s) This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0089869 filed July 20, 2022, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification. The present invention relates to a battery pack and a device including the same, and more specifically, to a Cell-to-Pack (CTP) type battery pack that, in the event of a thermal event, allows venting gas to be discharged to the outside of the battery pack along a specific path, thereby minimizing thermal runaway transfer within the battery pack and preventing structural collapse, and to a device including the same. Currently, secondary batteries are not only being used as energy sources for multifunctional small products such as wireless mobile devices or wearable devices, but are also being widely used as energy sources or energy storage systems (ESS) for electric vehicles and hybrid electric vehicles, which are presented as alternatives to existing gasoline and diesel vehicles. Generally, the operating voltage of a single secondary battery is approximately 2.5V to 4.5V. Therefore, for electric vehicles or power storage devices requiring high capacity and high output, battery modules formed by connecting multiple secondary batteries in series and/or parallel, and battery packs formed by connecting said battery modules in series and/or parallel, are used as energy sources. In other words, a conventional battery pack includes battery modules as a sub-concept, and a battery module includes battery cells as a sub-concept. Furthermore, the number of battery cells in a battery module or the number of battery modules in a battery pack can be determined in various ways depending on the output or capacity of the battery pack required for the electric vehicle. On the other hand, conventional battery packs may be disadvantageous in terms of energy density. For instance, during the modularization process where multiple battery cells are housed inside a module case, the volume and weight of the battery pack may unnecessarily increase due to various components such as the module case or stacking frame, or the space occupied by the battery cells may be reduced. Furthermore, not only is the space occupied by the components themselves, such as the module case or stacking frame, reduced, but the space for housing the battery cells may also be cut to ensure assembly tolerances for these components. Consequently, conventional battery packs may face limitations in increasing energy density. Furthermore, one of the major issues with conventional battery packs is safety. In particular, if a thermal event occurs in any one of the multiple battery cells included in the pack, it is necessary to prevent the propagation of such an event to other battery cells. If thermal propagation between battery cells is not properly suppressed, it can lead to thermal events in other cells within the battery pack, potentially causing more serious problems such as ignition or explosion of the battery pack. Furthermore, ignition or explosion occurring within the battery pack can cause significant damage to surrounding lives and property. Therefore, such battery packs require a configuration capable of appropriately controlling the aforementioned thermal events. FIG. 1 is a perspective view showing a part of a battery pack according to one embodiment of the present invention. FIG. 2 is a perspective view showing the battery pack of FIG. 1 with the venting unit removed. FIG. 3 is a perspective view showing a battery cell assembly and a venting unit according to one embodiment of the present invention. Figure 4 is an exploded perspective view of the battery cell assembly of Figure 3. FIG. 5 is a perspective view showing one of the battery cell units included in the battery cell assembly of FIG. 3 and FIG. 4. Fig. 6 is an exploded perspective view of the battery cell unit of Fig. 5. Figure 7 is a drawing showing a battery cell included in the battery cell unit of Figure 6. FIG. 8 is a perspective view showing a cell cover included in the battery cell unit of FIG. 6. Figures 9 (a) and 9 (b) are cross-sectional views showing embodiments of the present invention, each cross-sectional view along the cutting line C-C' of Figure 8. FIG. 10 is a perspective view showing a venting unit according to one embodiment of the present invention. FIG. 11 is a cross-sectional view showing a part of the cross section along the cutting line A-A' of FIG. 1. FIG. 12 is a cross-sectional view showing a part of the cross section along the cutting line B-B' of FIG. 1. FIG. 13 is an exploded perspective view showing an enlarged view of the battery cell and busbar module included in the battery cell unit of FIG. 5 and FIG. 6. FIG. 14 is a perspective view showing a busbar included in the busbar module of FIG. 5 and 6. FIG. 15 is a perspective