CN-122029665-A - Battery pack and vehicle including the same

Abstract

The battery pack according to the present invention includes a plurality of battery modules, a battery pack case having an inner space for accommodating the plurality of battery modules and a wall portion surrounding the battery modules, and at least one fire-resistant partition wall partitioning the inner space provided between the battery modules and detachably assembled to the wall portion, wherein the fire-resistant partition wall may include a main body portion made of a fire-resistant material and an edge portion made of a rigid material and surrounding an outer circumference of the main body portion.

Inventors

• Yin Xianxie
• ZHENG HUIMEI

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260512

Application Date

20250424

Priority Date

20240530

Claims (17)

1. 1. A battery pack, the battery pack comprising: A plurality of battery modules; A battery pack case having an inner space configured to accommodate the plurality of battery modules and a wall portion configured to surround the battery modules, and At least one fire-resistant separator disposed between the battery modules to partition the inner space and detachably assembled to the wall portion, Wherein the refractory separator includes a main body portion made of a refractory material and an edge portion made of a rigid material and configured to surround an outer periphery of the main body portion.
2. 2. The battery pack according to claim 1, Wherein the body portion is made of a refractory material including at least one of aerogel, mica, and silicon.
3. 3. The battery pack according to claim 1, Wherein the rim portion is made of a rigid material including at least one of steel, reinforced ceramic, and titanium.
4. 4. The battery pack according to claim 1, Wherein each of the battery modules is placed inside the battery pack case such that the left, right, front and rear sides of each of the battery modules are surrounded by the wall portion and the fire-resistant partition.
5. 5. The battery pack according to claim 1, Wherein the wall portion includes a diaphragm assembly configured to slidably couple the refractory diaphragm in an up-down direction.
6. 6. The battery pack according to claim 5, Wherein the partition plate assembly includes a pair of guide blocks configured to protrude from side surfaces of the wall portion, extend in the up-down direction, and are spaced apart from each other by a gap corresponding to a thickness of the refractory partition plate.
7. 7. The battery pack according to claim 6, Wherein the pair of guide blocks has at least one bolt fastening hole, and the refractory partition plate has a through hole that coincides with the bolt fastening hole when inserted between the pair of guide blocks.
8. 8. The battery pack according to claim 5, Wherein the partition plate assembly includes an insertion guide groove concavely formed in a side surface of the wall portion by a predetermined depth and extending in the up-down direction, and Wherein the refractory partition includes an insertion protrusion provided at least one end and configured to be insertable into the insertion guide groove in the up-down direction.
9. 9. The battery pack according to claim 5, Wherein the partition plate assembly includes an insertion guide protrusion formed to protrude on a side surface of the wall portion and extend in the up-down direction, and Wherein the refractory partition includes an insertion groove provided at least at one end and configured to insert the insertion guide protrusion into the insertion groove in the up-down direction.
10. 10. The battery pack according to claim 1, Wherein, the group battery casing includes: a battery tray having an open top and a bottom plate, the plurality of battery modules and the wall portion being mounted on the bottom plate, and A battery pack cover configured to cover a top of the opening of the battery pack tray.
11. 11. The battery pack according to claim 10, Wherein the wall portion includes: An outer wall disposed along an outer edge of the base plate, and A first beam configured to extend across the floor and connect to the outer wall.
12. 12. The battery pack according to claim 11, Wherein one end of the refractory partition is coupled to the first beam and the other end of the refractory partition is coupled to the outer wall.
13. 13. The battery pack according to claim 1, Wherein the battery pack housing further comprises a second cross member configured to separate the battery modules laterally adjacent to each other, and Wherein the refractory separator is disposed between the battery module and the second beam.
14. 14. The battery pack of claim 1, further comprising: A module top cover spacer detachably assembled to the wall portion to cover a top end of at least one of the battery modules.
15. 15. The battery pack according to claim 14, Wherein the wall portion has a partition mounting groove concavely formed in the top end surface, and Wherein, the module top cover baffle has the installation protrusion, the installation protrusion sets up at the edge of module top cover baffle with baffle mounting groove shape cooperation.
16. 16. The battery pack according to claim 14, Wherein the wall portion includes a bolt fastening portion provided at the tip end and having a screw hole, and Wherein the module top cover spacer includes a protrusion provided at an edge and bolted to the bolt fastening portion.
17. 17. A vehicle comprising a battery pack according to any one of claims 1 to 16.

Description

Battery pack and vehicle including the same Technical Field The present disclosure relates to a battery pack, and more particularly, to a battery pack capable of suppressing or delaying a thermal runaway phenomenon between battery modules when a fire occurs in the battery pack. The present application claims priority from korean patent application No. 10-2024-00705559 filed in korea on 5 months and 30 days of 2024, the disclosure of which is incorporated herein by reference. Background Secondary batteries having high applicability according to product category and electrical characteristics (e.g., high energy density) are widely used not only for portable devices but also for Electric Vehicles (EVs) or Hybrid Electric Vehicles (HEVs) driven by a power source. Secondary batteries are attracting attention as new energy sources that are advantageous in terms of environmental protection and energy efficiency, not only because they can significantly reduce the use of fossil fuels, but also because they do not generate any by-products in the use of energy. The types of secondary batteries currently in wide use include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, and nickel zinc batteries. When a high output voltage is required, a plurality of battery cells are connected in series to form a battery module or battery pack. In addition, a plurality of battery cells are connected in parallel to form a battery module or a battery pack to increase charge/discharge capacity. Accordingly, the number of battery cells included in the battery module or the battery pack may be differently set according to a desired output voltage or charge/discharge capacity. Generally, the operating voltage of the secondary battery is about 2.5V to 4.5V. Therefore, for example, in an electric vehicle, a battery module is configured by connecting a plurality of secondary batteries in series and/or in parallel, and a battery pack is configured by connecting a plurality of battery modules in series and/or in parallel, and the battery pack is used as an energy source. Meanwhile, recently, since a large number of battery modules are tightly packed in the inner space of a limited battery pack case, the battery pack has a very low energy density. The battery pack is criticized for its low fire safety because if a fire occurs in one battery module, heat is spread and rapidly causes a chain fire of other adjacent battery modules. Therefore, it has become an important task in the art to provide a method of delaying or suppressing the propagation of thermal energy between battery modules within a battery pack to cope with the problem of ignition of the battery modules when designing the battery pack. 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 pack capable of suppressing or delaying the propagation of thermal energy to adjacent battery modules when a fire occurs in the battery modules. Further, it is an object of the present disclosure to apply an assemblable and detachable fire-resistant separator inside a battery pack case such that the battery modules and the fire-resistant separator can be variably arranged as needed, thereby enabling more efficient use of the internal space of the battery pack. The technical problems the present disclosure seeks to solve are not limited to the above problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the following description of the invention. Technical proposal In one aspect of the present disclosure, a battery pack is provided that includes a plurality of battery modules, a battery pack case having an inner space configured to accommodate the plurality of battery modules and a wall portion configured to surround the battery modules, and at least one fire-resistant separator disposed between the battery modules to partition the inner space and detachably assembled to the wall portion, wherein the fire-resistant separator includes a main body portion made of a fire-resistant material and an edge portion made of a rigid material and configured to surround an outer circumference of the main body portion. The body portion may be made of a refractory material including at least one of aerogel, mica, and silicon. The rim portion may be made of a rigid material including at least one of steel, reinforced ceramic, and titanium. Each battery module may be placed inside the battery pack case such that the left, right, front and rear sides of each battery module are surrounded by the wall parts and the fire-resistant partition plates. The wall portion may include a bulkhead assembly configured to slidably couple the refractory bulkhead in an up-down direction. The partition plate assembly may include a pair of guide blocks configured to protrude from side surf