CN-122003755-A - Battery pack and vehicle comprising same

Abstract

The battery pack according to the present invention may include a plurality of battery modules, a battery pack case having an inner space 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, disposed between the battery modules, and attachably/detachably assembled at the wall portion, wherein the fire-resistant partition wall may include an air layer and a fire-resistant cushion layer made of a fire-resistant material therein.

Inventors

• Yin Xianxie
• CUI TINGYU

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20250424

Priority Date

20240530

Claims (15)

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 barrier provided between the battery modules to partition the inner space and detachably assembled to the wall part, Wherein the refractory barrier includes an air layer and a refractory cushion layer made of a refractory material inside.
2. 2. The battery pack according to claim 1, Wherein the refractory pad layer includes at least one of aerogel, mica, and silicon.
3. 3. The battery pack according to claim 1, Wherein the refractory barrier comprises: a rigid frame made of a rigid material and configured to support the periphery of the refractory cushion, and A refractory sheet spaced apart from the refractory cushion layer to form the air layer, and attached to the rigid frame.
4. 4. The battery pack according to claim 1, Wherein the refractory barrier has a plurality of refractory cushions and a plurality of air layers spaced apart from each other inside.
5. 5. The battery pack according to claim 1, Wherein the wall portion includes a barrier assembly configured to allow the refractory barrier to be slidably coupled in an up-down direction.
6. 6. The battery pack according to claim 5, Wherein the barrier 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 barrier.
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 barrier has a through hole that coincides with the bolt fastening hole when the refractory barrier is inserted between the pair of guide blocks.
8. 8. The battery pack according to claim 5, Wherein the barrier assembly includes an insertion guide groove concavely formed in a side surface of the wall portion to a predetermined depth and extending in the up-down direction, and Wherein the refractory barrier includes an insertion protrusion provided at least one end, and the insertion protrusion is configured to be fitted into the insertion guide groove in the up-down direction.
9. 9. The battery pack according to claim 1, Wherein, the group battery casing includes: A battery tray having a bottom plate and an open top, the plurality of battery modules and the wall portion being mounted on the bottom plate, and A battery cover configured to cover the open top of the battery tray.
10. 10. The battery pack according to claim 9, 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.
11. 11. The battery pack according to claim 10, Wherein the refractory barrier has one end coupled to the first cross member and another end coupled to the outer wall.
12. 12. The battery pack according to claim 1, Wherein the battery pack case further includes a second cross member configured to separate the battery modules adjacent to each other in a lateral direction, and Wherein the fire barrier is disposed between the battery module and the second beam.
13. 13. The battery pack of claim 1, further comprising: A module top cover barrier detachably assembled to the wall portion to cover a top end of at least one of the battery modules.
14. 14. The battery pack according to claim 13, Wherein the wall portion has a barrier mounting groove recessed in the top end surface, and Wherein the module top cover barrier has a mounting protrusion provided at an edge of the module top cover barrier to form-fit with the barrier mounting groove.
15. 15. A vehicle comprising a battery pack according to any one of claims 1 to 14.

Description

Battery pack and vehicle comprising 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. 10-2024-0070360 filed in korea at 5/30 of 2024, the disclosure of which is incorporated herein by reference. Background The secondary battery has high applicability and electrical characteristics such as high energy density according to product groups, and is 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 environmentally friendly and have improved energy efficiency not only because they can greatly reduce the use of fossil fuels, but also because they do not generate any by-products from the use of energy. The types of secondary batteries that are widely used at present 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, in order to improve charge and discharge capacity, a plurality of battery cells are connected in parallel to form a battery module or a battery pack. 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. In addition, recently the battery pack has a very low energy density because a large number of battery modules are tightly packed in a limited inner space of the battery pack case. The battery pack suffers from low fire safety because if a fire breaks out in one of the battery modules, heat may spread and rapidly cause a chain fire of other adjacent battery modules. Therefore, in the art, when designing a battery pack, in order to cope with the problem of ignition of battery modules, it is becoming an important task to provide a method of delaying or suppressing the propagation of thermal energy between battery modules within the battery pack. Disclosure of Invention Technical problem The present disclosure is directed to solving the problems of the prior art, and therefore, the present disclosure is directed to providing 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. In addition, it is an object of the present disclosure to apply a fire-resistant barrier, which can be assembled and disassembled, inside a battery pack case so that the battery modules and the fire-resistant barrier can be variably arranged as needed, thereby enabling more efficient use of the internal space of the battery pack. The technical problems to be solved by the present disclosure are not limited to the above-described problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the following description of the present 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 barrier disposed between the battery modules to partition the inner space and detachably assembled to the wall portion, wherein the fire-resistant barrier includes an air layer and a fire-resistant cushion layer made of a fire-resistant material inside. The refractory cushion may include at least one of aerogel, mica, and silicone. The refractory barrier may include a rigid frame made of a rigid material and configured to support a periphery of the refractory cushion layer, and a refractory sheet spaced apart from the refractory cushion layer to form an air layer, and the refractory sheet is attached to the rigid frame. The refractory barrier may have a plurality of refractory cushions and a plurality of air layers spaced apart from each other inside. The wall portion may include a barrier assembly configured to allow the refractory barrier to be slidably coupled in an up-down direction. The barrier assembly may include a pair of guide blocks configured to prot