Battery pack case including over-fusion prevention structure

Patent metadata

Field	Value
Publication number	US-12562424-B2
Application number	US-202117915851-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Nov 23, 2020
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

Discussed is a battery pack case configured to receive a plurality of battery cells, the battery pack case including a first case and a second case coupled to each other through and engagement between first case and the second case. A projecting portion is on a coupling portion of the first case at a middle part of the first case in a thickness direction to project therefrom, a grooved portion is in a coupling portion of the second case at a middle part of the second case in a thickness direction thereof such that the projecting portion is inserted into the grooved portion, and a uniform gap between the outside of the projecting portion of the first case and the outside of the grooved portion of the second case in the state in which the first case and the second case are coupled and thermally fused to each other.

First claim

The invention claimed is:

1 . A battery pack case configured to receive a plurality of battery cells, the battery pack case comprising:
a first case and a second case coupled to each other through an engagement between the first case and the second case, wherein a projecting portion is on a coupling portion of the first case at a middle part of the first case in a thickness direction thereof so as to project therefrom, wherein a grooved portion is in a coupling portion of the second case at a middle part of the second case in a thickness direction thereof such that the projecting portion is inserted into the grooved portion, and wherein a uniform gap is between an outside of the projecting portion of the first case and an outside of the grooved portion of the second case in a state in which the first case and the second case are coupled and thermally fused to each other, wherein a support structure configured to form the gap is formed in the grooved portion of the second case, wherein a stopper rib is formed in the grooved portion of the second case as the support structure, and wherein a sum of a height of the stopper rib and a length of the projecting portion at a part the first case at which the stopper recess is formed is greater than a depth of the grooved portion of the second case in a state in which the first case and the second case are coupled and thermally fused to each other.

2 . The battery pack case according to claim 1 , wherein the stopper recess is formed at a position of the projecting portion of the first case corresponding to the stopper rib.

3 . The battery pack case according to claim 2 , wherein a depth of the stopper recess is less than a height of the projecting portion.

4 . The battery pack case according to claim 2 , wherein a depth of the stopper recess is greater than the height of the stopper rib based on a state before the projecting portion is melted.

5 . The battery pack case according to claim 1 , wherein the projecting portion comprises an energy director configured to be melted by heat and a support portion excluding the energy director.

6 . The battery pack case according to claim 1 , wherein a gap is present between the projecting portion and an inner surface of the grooved portion before the first case and the second case are thermally fused to each other, and
wherein the projecting portion and the grooved portion are fused to each other in a state in which the first case and the second case are thermally fused to each other.

7 . The battery pack case according to claim 1 , wherein the support structure is formed on at least one side of each of outer peripheries of the first case and the second case at which the first case and the second case are coupled to each other.

8 . The battery pack case according to claim 1 , wherein the support structure is formed on entireties of outer peripheries of the first case and the second case at which the first case and the second case are coupled to each other.

Assignees

• Lg Energy Solution Ltd

Inventors

• Jang Jae Young
• Lee Jin Hyun
• Kim Sang Jin

Classifications

• B29L2031/7146

  Battery-cases · CPC title

• B29C65/56

  using mechanical means {or mechanical connections, e.g. form-fits} · CPC title

• B29C65/08

  using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)} · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/204 Primary

  Racks, modules or packs for multiple batteries or multiple cells · CPC title