IP Library › Granted Patent US 12665245
Granted Patent B2
US 12665245 · App. 17/924,074 · Granted Jun 23, 2026

Battery cell and battery module including the same

Inventors: Won Kyoung Park (Daejeon, KR); Junyeob Seong (Daejeon, KR); Subin Park (Daejeon, KR)
Assignee: LG Energy Solution, Ltd.
H01M50/178H01M50/184H01M50/211H01M50/581
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Quick Facts
Patent No.
US 12665245
App. No.
17/924,074
Granted
Jun 23, 2026
Kind
B2
Abstract

A battery cell according to the present disclosure can include a battery case that has an electrode assembly mounted therein. The battery case can include a sealing part having a structure in which the outer peripheral side is sealed by heat fusion. An electrode lead that is electrically connected to the electrode tab can be included in the electrode assembly. The electrode lead can protrude outward from the battery case via the sealing part. A lead film can be located between the electrode lead and the sealing part. A protective member can be in contact with at least a part of an outer surface of the electrode lead. The size of the protective member can vary based on the temperature of the electrode lead.

Claims (26)

1 . A battery cell comprising:

a battery case with an electrode assembly mounted therein, the battery case including a sealing part, the sealing part having a structure with an outer peripheral side configured to be sealed by heat fusion;

an electrode lead electrically connected to an electrode tab of the electrode assembly, the electrode lead having a top surface, a bottom surface opposite the top surface, and two edge surfaces connecting the top surface and the bottom surface, the electrode lead protruding outward from the battery case through the sealing part;

a lead film located between the electrode lead and the sealing part; and

a protective member in contact with the top surface, the bottom surface and the two edge surfaces of the electrode lead,

wherein the protective member is configured to reduce in size when a temperature of the electrode lead exceeds a first temperature such that the electrode lead is electrically disconnected from the electrode tab.

2 . The battery cell of claim 1 , wherein the protective member extends along and across a width direction of the electrode lead to surround an outer surface of the electrode lead.

3 . The battery cell of claim 2 , wherein the protective member is reduced in size at the first temperature along at least one of the width direction of the electrode lead and a thickness direction of the electrode lead.

4 . The battery cell of claim 3 , wherein the protective member is made of a shape memory alloy (SMA).

5 . The battery cell of claim 4 , wherein the first temperature is 60 degrees Celsius or more.

6 . The battery cell of claim 1 , wherein the protective member is disposed adjacent to the lead film.

7 . The battery of claim 1 , wherein the protective member includes a main body part and an opening formed in a center of the main body part, the electrode lead extending into the opening, the main body part surrounding an surface of the electrode lead.

8 . The battery cell of claim 7 , wherein a thickness of the opening is greater than or equal to the thickness of the electrode lead.

9 . The battery cell of claim 8 , wherein an adhesive layer is disposed on at least one surface of the opening.

10 . A battery module comprising the battery cell of claim 1 .

11 . A battery cell comprising:

a battery case with an electrode assembly mounted therein, the battery case including a sealing part, the sealing part having a structure with an outer peripheral side configured to be sealed by heat fusion;

an electrode lead electrically connected to an electrode tab of the electrode assembly, the electrode lead having a top surface, a bottom surface opposite the top surface, and two edge surfaces connecting the top surface and the bottom surface, the electrode lead protruding outward from the battery case through the sealing part;

a lead film located between the electrode lead and the sealing part; and

a protective member in contact with the top surface, the bottom surface and the two edge surfaces of the electrode lead,

wherein the protective member is configured to reduce in size when a temperature of the electrode lead exceeds a first temperature such that the electrode lead is electrically disconnected from the electrode tab,

wherein the protective member is spaced apart from the sealing part and is disposed adjacent to the lead film.

12 . The battery cell of claim 11 , wherein the protective member extends along and across a width direction of the electrode lead to surround an outer surface of the electrode lead.

13 . The battery cell of claim 2 , wherein the protective member is configured to apply an inward pressure when reduced in size at the first temperature along at least one of the width direction of the electrode lead and a thickness direction of the electrode lead such that a cutting line is formed on the electrode lead.

14 . The battery cell of claim 13 , wherein the protective member is made of a shape memory alloy (SMA) configured to reduce to a predetermined size at the first temperature, wherein the predetermined size is smaller than a width and/or thickness of the electrode lead.

15 . The battery cell of claim 11 , wherein the protective member includes a main body part having a frame-like structure and an opening formed in a center of the main body part, the electrode lead extending into the opening, the main body part continuously surrounding the top surface, the bottom surface, and the two edge surfaces of the electrode lead.