JP-7855677-B2 - Battery packs and energy storage devices including battery packs

JP7855677B2JP 7855677 B2JP7855677 B2JP 7855677B2JP-7855677-B2

Inventors

ユン，ヨンウォン
ムン，ジョンオ
イ，ジェギ
キム，キユン
アン，ジョンギュ
キム，ヒョンギュ
パク，ギドン
イ，ソンジュ

Assignees

エルジーエナジーソリューションリミテッド

Dates

Publication Date: 20260508
Application Date: 20221221
Priority Date: 20211221

Claims (16)

A cell module assembly including a battery cell stack in which multiple battery cells are stacked, A pack case housing the aforementioned cell module assembly and including a vent on at least one side, A removable filter is placed in the aforementioned venting port, Includes an electrical coupling unit housed inside the pack case and positioned on one side of the cell module assembly, The aforementioned filter is Attached to the vent port to filter the venting gas when a thermal event occurs in the battery cell, To facilitate maintenance and repair of the battery pack's interior during normal operation, it is removable through the venting opening. When the filter is removed from the venting port, the components of the electrical coupling unit can be maintained and repaired through the opened venting port. Battery pack.
The electrical connection unit includes a cable for the electrical connection of the battery pack and a fuse electrically connected to the cable. When the filter is removed from the venting port, the cable or fuse can be inspected, repaired, or replaced through the opened venting port. The battery pack according to claim 1 .
A cell module assembly including a battery cell stack in which multiple battery cells are stacked, A pack case housing the aforementioned cell module assembly and including a vent on at least one side, Includes a removable filter positioned at the vent opening, The aforementioned filter is Attached to the vent port to filter the venting gas when a thermal event occurs in the battery cell, To facilitate maintenance and repair of the battery pack's interior during normal operation, it is removable through the venting opening. The filter is removable by sliding at the vent opening. Battery pack.
A cell module assembly including a battery cell stack in which multiple battery cells are stacked, A pack case housing the aforementioned cell module assembly and including a vent on at least one side, Includes a removable filter positioned at the vent opening, The aforementioned filter is Attached to the vent port to filter the venting gas when a thermal event occurs in the battery cell, To facilitate maintenance and repair of the battery pack's interior during normal operation, it is removable through the venting opening. The filter further includes locking claws at each of its opposing ends, The venting opening includes recesses at the edges of the venting opening, corresponding to the locking claws. After the locking claw is inserted into the pack case through the recess, the locking claw is configured to be attached by sliding along the edge of the venting opening including the recess. Battery pack.
The filter further includes a stopper at the edge connecting the two opposing ends of the filter, The stopper has a protrusion that extends inward from the pack case, The protruding portion is configured to stop the filter from sliding by contacting the edge of the vent opening. The battery pack according to claim 4 .
The aforementioned filter is A filter unit for filtering the aforementioned venting gas, Includes a filter frame that supports the filter section, The filter section is detachable from the filter frame. The battery pack according to claim 1, 3, or 4 .
The filter unit is A first filter member made of flame-retardant or non-combustible material, The first filter member includes a second filter member and a third filter member, both having a mesh structure made of metal, which are positioned on the front and rear surfaces of the first filter member, respectively. The battery pack according to claim 6 .
The battery pack according to claim 7 , wherein the first filter member is made of non-combustible plastic, glass fiber reinforced plastic (GFRP), or carbon fiber reinforced plastic (CFRP).
The second filter member faces the inside of the pack case, The third filter member faces outward from the pack case, The third filter member has a finer mesh structure than the second filter member. The battery pack according to claim 7 .
The aforementioned filter frame is A first filter frame member, including an opening, facing the inside of the pack case, The pack case includes a second filter frame member having an opening that faces outward, The first filter frame member and the second filter frame member are separated from each other by a predetermined distance, and the filter portion can be mounted between the first filter frame member and the second filter frame member. The battery pack according to claim 6 .
The battery pack according to claim 10 , wherein the filter portion is exposed through the opening of the filter frame.
The present invention further includes a third filter frame member that connects the respective edges of the first filter frame member and the second filter frame member, The filter portion is detachably attached between the first filter frame member and the second filter frame member, and the third filter frame member includes an opening on at least one surface. The battery pack according to claim 10 .
The aforementioned battery pack is provided in multiple units, The plurality of battery packs are connected to each other by mechanical or electrical connections. The battery pack according to claim 1, 3, or 4 .
The battery pack according to claim 13 , wherein the plurality of battery packs can be stacked in the vertical direction.
The battery pack according to claim 13, wherein the height of the outer cover is smaller than the height of the pack case so that an open space is secured between the pack case and the outer cover for each of the plurality of battery packs.
An energy storage device comprising the battery pack described in claim 1, 3, or 4 .

Description

(See related applications) This application claims priority rights based on Korean Patent Application No. 10-2021-0184400 dated December 21, 2021, and Korean Patent Application No. 10-2022-0179752 dated December 20, 2022, and all content disclosed in the documents of said Korean Patent Applications is incorporated herein by reference. (Technical field) The present invention relates to a battery pack and an energy storage device including the same, and more particularly to a battery pack that is configured to ensure safety even when a thermal event occurs, and is designed to facilitate maintenance and management of the battery pack under normal conditions. Rechargeable batteries, possessing high adaptability to various product groups and strong electrical characteristics such as high energy density, are universally applied not only to portable devices but also to electric vehicles (EVs) and hybrid electric vehicles (HEVs) powered by electric drive sources. Such rechargeable batteries offer not only the primary benefit of dramatically reducing the use of fossil fuels, but also attract attention as an environmentally friendly and energy-efficient new energy source, as they produce no by-products associated with energy use. Currently, widely used types of rechargeable batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of a single rechargeable battery cell is approximately 2.5V to 4.5V. Therefore, when a higher output voltage is required, multiple battery cells may be connected in series to form a battery pack. Alternatively, a large number of battery cells may be connected in parallel to form a battery pack depending on the required charge and discharge capacity. Therefore, the number of battery cells included in a battery pack can be set in various ways depending on the required output voltage or charge and discharge capacity. On the other hand, when configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to first construct a battery module containing at least one battery cell, and then use this at least one battery module to add other components and construct a battery pack or battery rack. Furthermore, these rechargeable batteries are widely used not only in small devices such as portable electronic devices, but also in medium- and large-scale devices such as electric vehicles and energy storage systems (ESS), and their use is rapidly increasing. Recently, there has also been a growing trend to use residential battery packs for energy storage. Conventional battery packs require a structure that allows for the smooth discharge of internal gases and the effective injection of cooling water. The following drawings accompanying this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described later, serve to further illustrate the technical concept of the invention. The present invention should not be construed as being limited solely to the matters depicted in those drawings. This is a diagram illustrating a battery pack according to one embodiment of the present invention.This diagram provides a schematic explanation of the main components of the battery pack shown in Figure 1.This diagram provides a schematic explanation of the main components of the battery pack shown in Figure 1.This is an exploded perspective view schematically showing the configuration of a battery pack according to another embodiment of the present invention.Figure 4 is a perspective view of the cell module assembly included in the battery pack.Figure 4 is a perspective view of the circuit breaker included in the battery pack.Figure 4 is a perspective view of the battery pack and its case.This is a magnified view of the area labeled P1 in Figure 7.Figure 8 is a perspective view of the decomposed filter.This is a magnified view of the area labeled P2 in Figure 7.Figure 7 shows the case after the filter has been removed from the pack case.Figure 4 is a perspective view of the battery pack and its outer cover.This is a perspective view of the pack case with the outer cover attached.The cross-section along the line A6-A6' in Figure 13 shows the flow of the venting gas.Figure 7 illustrates how the cell module assembly shown in Figure 7 can be housed in a pack case.Figure 4 is a perspective view of the fire extinguishing tank included in the battery pack.Figure 16 is a perspective cross-sectional view of a fire extinguishing tank.Figure 4 is a perspective view of the electrical coupling unit included in the battery pack.Referring to Figures 4 through 17, this is a perspective view of the battery pack with all the aforementioned components connected.Figures 1 through 19 are schematic perspective views showing the battery pack.Figure 20 shows an embodiment in which the pack cases shown are s