JP-7855705-B2 - Cell stack assembly and battery pack including the above cell stack assembly

JP7855705B2JP 7855705 B2JP7855705 B2JP 7855705B2JP-7855705-B2

Inventors

ジュ・ファン・シン
ジェ・ヒョン・イ
ヒョン・スク・イ

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: 20230427
Priority Date: 20220429

Claims (13)

A cell stack in which multiple battery cells are stacked, The busbar frame includes a busbar electrically connected to the battery cell, and the busbar frames are tightly coupled to the front and rear of the cell stack, An end plate that is connected to the busbar frame so as to cover the busbar, Support blocks are coupled to both sides of the end plate so as to cover one side of the battery cell located at the outermost edge of the cell stack, A cover coupled to the support block so as to cover at least one of the open upper and lower parts of the cell stack , The support block includes fastening grooves at the top and bottom, The cover is a cell stack assembly having through holes corresponding to fastening grooves of the support block in an area that is in contact with and coupled to the support block .
The cell stack assembly according to claim 1, wherein the fastening grooves are formed in multiple locations along the longitudinal direction of the support block at predetermined intervals.
The cell stack assembly according to claim 1, wherein the support blocks located on both sides of the cell stack each include fastening grooves at positions facing each other.
The cell stack assembly according to claim 1 , wherein the support block and cover are screw-connected by bolts inserted through the through-holes into the fastening grooves.
Cell stack assembly and A battery pack comprising a pack case in which multiple cell stack assemblies are arranged, The cell stack assembly is A cell stack in which multiple battery cells are stacked, The busbar frame includes a busbar electrically connected to the battery cell, and the busbar frames are tightly coupled to the front and rear of the cell stack, An end plate that is connected to the busbar frame so as to cover the busbar, The cell stack includes support blocks that are coupled to both sides of the end plate so as to cover one side of the battery cell located at the outermost edge of the cell stack, The support block includes fastening grooves at the top and bottom, The aforementioned cell stack assembly is a battery pack in which at least one support block is arranged to be in contact with one surface of a support block of an adjacent cell stack assembly.
The pack case includes a bottom hole formed through the bottom corresponding to the position of the fastening groove formed at the bottom of the cell stack assembly, The battery pack according to claim 5 , wherein the cell stack assembly is coupled to the pack case by bolts inserted into the fastening grooves and bottom holes.
The pack case further includes fixing members that are coupled to the support blocks of each cell stack assembly in order to secure at least two cell stack assemblies arranged in the pack case, The fixing member includes a fixing hole formed through to a position corresponding to the fastening groove of each support block, The battery pack according to claim 5 , wherein the fixing member is screw-coupled to the support block by bolts inserted into the fixing holes and fastening grooves corresponding to the fixing holes.
The battery pack according to claim 7 , wherein the fixing member is connected at both ends to two adjacent support blocks to fix a pair of cell stack assemblies.
The fixing member is formed to extend along the longitudinal direction of two adjacent support blocks, The battery pack according to claim 7 , wherein the fixing holes are formed spaced apart along the longitudinal direction of the fixing member so as to correspond to the fastening grooves of each support block.
The battery pack according to claim 7 , wherein the fixing member is formed to extend in the width direction of the support block to fix a plurality of cell stack assemblies and is coupled with at least four support blocks.
The battery pack according to claim 10 , wherein the fixing member is formed to extend across the cell stack included in the cell stack assembly and supports the upper part of the cell stack.
The pack case includes a lower plate that supports the lower part of the cell stack assembly being placed, The cell stack assembly includes a side wall formed along the edge of the lower plate so as to enclose the side surface of the cell stack assembly, The inner surface of the side wall includes an attachment portion that protrudes in the direction of the cell stack assembly. The support block of the cell stack assembly includes a projection that protrudes in at least one direction from either the front or rear surface of the cell stack assembly. The battery pack according to claim 5 , wherein the cell stack assembly is arranged in the pack case such that the protruding portion is secured on the securing portion of the side wall.
The aforementioned attachment portion includes an attachment groove at its upper part. The aforementioned protrusion includes a protruding hole formed through the upper and lower parts, The battery pack according to claim 12 , wherein the cell stack assembly is screw-coupled to the side wall by bolts inserted into the protruding holes and fastening grooves.

Description

This invention relates to a cell stack assembly containing multiple stacked battery cells and a battery pack including the cell stack assembly. More specifically, the invention is characterized by improving the usability of the internal space of the battery pack by removing partitions for dividing the cell stack assembly from the battery pack and using a support block configuration that can replace the partitions. This application claims priority under Korean Patent Application No. 10-2022-0053655 dated April 29, 2022, and all content disclosed in the said Korean Patent Application is incorporated herein by reference. 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 the above-mentioned 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 configure a battery module containing at least one battery cell, and then use this at least one battery module to add other components and complete the battery pack. Conventional battery modules typically include at least one cell stack containing battery cells, and a metal housing structure in the form of a box, i.e., a module frame, that houses such at least one cell stack. Such conventional battery module structures suffer from the problem of reduced energy density and increased overall weight of the battery pack due to the weight and volume of the module frame itself. Due to the problems described above, we attempted a method of housing and arranging the cell stack in a battery pack only by eliminating the conventional module frame configuration that encloses and protects the cell stack, and instead attaching the busbar frame and end plates to the front and rear surfaces where the electrode leads are formed on the cell stack, respectively. Figure 1 is a perspective view of a cell stack assembly, excluding the module frame and including the cell stack, busbar frame, and end plates. However, a cell stack assembly with a structure like that shown in Figure 1 presents problems in terms of handling and ease of securing it inside a battery pack. Therefore, there is a need to explore solutions for providing a cell stack assembly that is easy to fix and handle, and a battery pack containing such a cell stack assembly, by reducing the overall weight through weight reduction, thereby increasing energy density. This shows a conventional cell stack assembly.This is an exploded perspective view of the cell stack assembly of the present invention.This is a perspective view of the cell stack assembly of the present invention.This is a perspective view of the cover and the cell stack assembly of the present invention.This is a perspective view of the cell stack assembly of the present invention with the cover attached.Figure 5 above is a cross-sectional view of the cell stack assembly.This is a perspective view of the battery pack of the present invention.This is a perspective view of a pair of cell stack assemblies of the present invention arranged adjacent to each other.This is a rear perspective view of the pack case of the present invention.This is a modified example of the support block of the present invention.The above Figure 10 shows a portion of the cell stack assembly and pack case to which the support block is applied.This is a plan view of a battery pack including a cell stack assembly to which the support block shown in Figure 11(a) above is applied, and a pack case in which the cell stack assembly is arranged.This shows the fixing member and cell stack assembly included in the battery pack of the present invention according to the first embodiment.This is a perspective view of a pair of cell stack assemblies to which the fixing member shown in Figure 13 above is applied.The above Figure 13 shows a plan view of a battery pack including a cell stack assembly to which the fixing member is applied, and a pack case in which the cell stack assembly is arranged.This shows the fixing member and cell stack assembly included in the battery pack of the present invention according to the second embodiment.This shows the fixing member and cell stack assembly included in the battery pack of the present invention according to the third embodiment. Preferred embodiments of the present invention will be described in detail bel