CN-116057774-B - Battery module and battery pack including the same

Abstract

A battery module according to an embodiment of the present invention includes a cell stack formed by vertically stacking a plurality of cells, a module housing for accommodating the cell stack, a bus bar frame assembly covering an opening formed in one side of the module housing in a longitudinal direction, and a fire protection sheet assembly interposed between the bus bar frame assembly and the cell stack and coupled to the bus bar frame assembly.

Inventors

• Wu Yinghou
• KONG WEITAN
• JIN CHENGXIAN
• SHEN JINKUI
• YU SHENGMIN
• CAO XIANGXUAN
• Hong Xinghun

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20220111

Priority Date

20210111

Claims (11)

1. 1. A battery module, comprising: a cell stack in which a plurality of cells are vertically stacked; a module housing in which the battery cell stack is housed; A bus bar frame assembly covering an opening portion formed on one side in a longitudinal direction of the module housing, and A fire protection sheet assembly positioned between the bus bar frame assembly and the cell stack and coupled to the bus bar frame assembly, Wherein, fire protection sheet assembly includes: a fire prevention sheet including a plurality of sheet slits through which electrode leads of the battery cells pass, and A tab cover including a plurality of cover slits through which the electrode leads of the battery cells pass, the tab cover covering the fire-preventing tab, Wherein the fireproof sheet is a mica sheet.
2. 2. The battery module of claim 1, wherein the module housing comprises: a substrate supporting the battery cell stack, and A pair of side plates covering both side portions of the battery cell stack, Wherein each of the pair of side plates includes a spark direction changing portion formed by bending an end portion of the side plate in a longitudinal direction toward the battery cell stack.
3. 3. The battery module according to claim 2, wherein the opening portion is formed between a pair of spark direction changing portions provided on the pair of side plates, respectively, Wherein the electrode leads of the battery cells are exposed to the outside of the module case through the opening parts.
4. 4. The battery module of claim 1, wherein the bus bar frame assembly comprises: a bus bar frame covering the opening portion and including a plurality of frame slits through which electrode leads of the battery cells pass, and At least one bus bar located on an outer surface of the bus bar frame and coupled to the electrode lead passing through the frame slit.
5. 5. The battery module of claim 1, wherein the sheet cover completely covers the mica sheet such that the mica sheet is not exposed to outside air.
6. 6. The battery module of claim 3, wherein the module housing further comprises a fastening frame connecting the pair of spark direction changing portions and having a hollow center portion.
7. 7. The battery module of claim 6, wherein the fastening frame is located between the bus bar frame assembly and the fire protection sheet assembly, Wherein the bus bar frame assembly and the fire protection sheet assembly are closely attached to the fastening frame and coupled to each other through the hollow center portion of the fastening frame.
8. 8. The battery module of claim 1, wherein each of the plurality of cover slits has a shape in which a width of the cover slit decreases toward the bus bar frame assembly.
9. 9. A battery pack comprising the battery module according to any one of claims 1 to 8.
10. 10. An Energy Storage System (ESS) comprising the battery pack of claim 9.
11. 11. A vehicle comprising the battery pack according to claim 9.

Description

Battery module and battery pack including the same Technical Field The present disclosure relates to a battery module, a battery pack including the battery module, and an Energy Storage System (ESS) and a vehicle including the battery pack. More particularly, the present disclosure relates to a battery module having a structure capable of discharging gas to the outside when a battery cell is exhausted, preventing sparks including high-temperature electrode active materials and metal particles from leaking to the outside of the battery module, and preventing oxygen from being introduced into the battery module to prevent fire in the battery module, a battery pack including the battery module, an Energy Storage System (ESS) including the battery pack, and a vehicle. The present application claims priority from korean patent application No. 10-2021-0003508 filed in korea on 1 month 11 of 2021, the disclosure of which is incorporated herein by reference. Background A battery pack applied to an Energy Storage System (ESS) and/or an electric vehicle may be manufactured to include a plurality of battery modules to which a high-power and high-capacity lithium secondary battery is applied. In order to meet the output power characteristics of the battery pack required for the ESS and/or the electric vehicle and achieve high capacity, the number of lithium secondary batteries included in one battery module may be increased, and the number of battery modules included in one battery pack may be increased. However, when a fire or explosion occurs in a battery pack including such a large number of lithium secondary batteries, damage is inevitably increased. The fire occurring in the battery pack starts from abnormal temperature rise and internal gas generation of the lithium secondary batteries in the battery module. When the temperature of the lithium secondary battery abnormally increases and internal gas is generated, and thus the internal pressure of the lithium secondary battery increases to a certain level or more, degassing of the lithium secondary battery occurs, and thus, high-temperature gas is injected to the outside of the lithium secondary battery and high-temperature spark including an electrode active material and aluminum particles is injected. In this case, in order to prevent an increase in the internal pressure of the battery module, the exhaust gas should be able to be rapidly discharged to the outside of the battery module. However, when the high temperature spark is discharged to the outside of the battery module along with the exhaust gas, the high temperature spark, and the oxygen may meet to cause a fire. Accordingly, it is required to develop a battery module having a structure capable of rapidly discharging exhaust gas to the outside of the battery module and effectively preventing high-temperature sparks including an electrode active material and aluminum particles from leaking to the outside even when thermal runaway occurs due to an abnormality such as a short circuit in a battery cell. Also, when damaged due to continuous contact of sparks and high-temperature gas with a structure such as a bus bar frame applied to prevent short circuits between a plurality of lithium secondary batteries, oxygen may be easily introduced into the battery module from the outside of the battery module, so that a fire may even spread into the battery module. Also, when the bus bar frame is damaged, electrode leads of adjacent lithium secondary batteries, which are kept apart from each other due to the bus bar frame, may contact each other, and an accident may be enlarged. Accordingly, it is required to develop a battery module having a structure capable of preventing free inflow of external oxygen and preventing an accident from being amplified due to a short circuit between adjacent lithium secondary batteries even when some structures are damaged due to sparks and high temperature gas. Disclosure of Invention Technical problem The present disclosure is designed to solve the problems of the related art, and therefore, it is an object of the present disclosure to provide a battery module having a structure capable of rapidly discharging exhaust gas, effectively preventing high-temperature sparks from leaking to the outside, and preventing external air from being introduced into the battery module after the exhaust gas is discharged, when an accident such as a fire occurs. The present disclosure is also directed to providing a battery module having a structure capable of preventing external oxygen from being easily introduced into the battery module and preventing a short circuit between adjacent lithium secondary batteries even when some structures are damaged due to sparks and high-temperature gas. However, technical objects to be solved by the present disclosure are not limited to the above, and other objects not mentioned herein will be clearly understood by those of ordinary skill in the art from the followi