US-12620617-B2 - Battery and electronic device comprising same

US12620617B2US 12620617 B2US12620617 B2US 12620617B2US-12620617-B2

Abstract

A battery includes: a positive electrode including a positive electrode substrate having a first surface and a second surface, a positive active material applied to the first surface of the positive electrode substrate, and a positive electrode tab attached to the first surface of the positive electrode substrate; a negative electrode including a negative electrode substrate having a first surface and a second surface, a negative active material applied to the first surface of the negative electrode substrate, and a negative electrode tab attached to the first surface of the negative electrode substrate; and a separator provided between the positive electrode and the negative electrode, wherein the first surface of the negative electrode substrate includes a first region to which the negative active material is not applied and which faces the positive electrode tab, the first surface of the negative electrode substrate includes a second region to which the negative active material is applied and which is adjacent to the first region in a longitudinal direction of the positive electrode tab, and the negative electrode includes an insulating layer disposed in at least a portion of the first region.

Inventors

Guyeon KIM
Seongil Lee
Yongsub Jeon
Jooyil PYUN

Assignees

SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20230120
Priority Date: 20200722

Claims (8)

1 . A battery comprising: a positive electrode comprising a positive electrode substrate having a first surface and a second surface, a positive active material applied to the first surface of the positive electrode substrate, and a positive electrode tab attached to the first surface of the positive electrode substrate; a negative electrode comprising a negative electrode substrate having a first surface and a second surface, a negative active material applied to the first surface of the negative electrode substrate, and a negative electrode tab attached to the first surface of the negative electrode substrate; and a separator provided between the positive electrode and the negative electrode, wherein the first surface of the negative electrode substrate comprises a first region to which the negative active material is not applied and which faces the positive electrode tab, wherein the first surface of the negative electrode substrate comprises a second region to which the negative active material is applied and which is adjacent to the first region in a longitudinal direction of the positive electrode tab, and wherein the negative electrode comprises an insulating layer disposed in at least a portion of the first region.
2 . The battery of claim 1 , wherein the insulating layer comprises a first insulating layer disposed from the first region up to a peripheral region of the second region within a predetermined range from the first region.
3 . The battery of claim 1 , wherein the insulating layer comprises a second insulating layer disposed in the first region.
4 . The battery of claim 1 , wherein an end of the positive electrode substrate and an end of the negative electrode substrate do not overlap.
5 . The battery of claim 1 , further comprising: a plurality of turn regions comprising a first turn region and a second turn region, wherein the positive electrode substrate, the separator, and the negative electrode substrate are wound in a jelly-roll type configuration.
6 . The battery of claim 5 , wherein the first region to which the negative active material is not applied is disposed in a turn region, from among the plurality of turn regions, that is adjacent to a different turn region from among the plurality of turn regions, and wherein the positive electrode tab is disposed in the different turn region.
7 . The battery of claim 6 , wherein on the second surface of the negative electrode substrate, the negative active material is not applied to a region corresponding to the first region.
8 . An electronic device comprising: the battery of claim 1 ; a memory; and a processor, wherein the battery is configured to supply power to the memory and the processor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a by-pass continuation of International Application No. PCT/KR2021/009501, filed on Jul. 22, 2021, which is based on and claims priority to Korean Patent Application No. 10-2020-0091124, filed on Jul. 22, 2020, in the Korean Intellectual Property Office, the disclosures of which are incorporated by reference herein in their entireties. BACKGROUND 1. Field The disclosure relates to a battery and an electronic device including the same. 2. Description of Related Art Recently, the demand for batteries is increasing due to an increase in the demand for portable electronic devices. For example, among various types of batteries, a lithium-ion battery is widely used in portable electronic devices due to advantages such as high energy density, high discharge voltage, and output stability. A lithium-ion battery may include a negative electrode substrate to which a negative active material is applied, a positive electrode substrate to which a positive active material is applied, and a separator disposed between the negative electrode substrate and the positive electrode substrate. One research subject in the field of batteries is improvement of safety. Lithium-ion batteries, which are commonly used in portable electronic devices, may cause accidents such as fire and explosion due to various factors such as an internal short, exceeding the allowed current (or voltage) during charging, temperature rise, and external shock. In the related art, in order to prevent the above-mentioned accidents, in the active material (a positive active material or a negative active material) applied to an electrode plate (a positive electrode substrate or a negative electrode substrate), the active material in facing region (hereinafter, a “facing region”) facing a tab (a positive electrode tab or a negative electrode tab) is removed. However, the facing region from which the active material was removed may cause pressure imbalance during the manufacturing process of the battery due to a difference in thickness between the facing region from which the active material is removed and the remaining region to which the active material is applied. In addition, in the facing region from which the active material is removed, resistance may be locally increased. Such an increase in local resistance may cause accumulation of lithium (Li) in the electrolyte, which may eventually lead to swelling of the battery. SUMMARY Provided are a battery in which the thickness of the facing region from which the active material is removed is made to be uniform with the thickness of the other region to which the active material is applied, so that safety of the battery may be improved, and an electronic device including the battery. According to an aspect of the disclosure, a battery includes: a positive electrode including a positive electrode substrate having a first surface and a second surface, a positive active material applied to the first surface of the positive electrode substrate, and a positive electrode tab attached to the first surface of the positive electrode substrate; a negative electrode including a negative electrode substrate having a first surface and a second surface, a negative active material applied to the first surface of the negative electrode substrate, and a negative electrode tab attached to the first surface of the negative electrode substrate; and a separator provided between the positive electrode and the negative electrode, wherein the first surface of the negative electrode substrate includes a first region to which the negative active material is not applied and which faces the positive electrode tab, the first surface of the negative electrode substrate includes a second region to which the negative active material is applied and which is adjacent to the first region in a longitudinal direction of the positive electrode tab, and the negative electrode includes an insulating layer disposed in at least a portion of the first region. The insulating layer may include a first insulating layer disposed from the first region up to a peripheral region of the second region within a predetermined range from the first region. The insulating layer may include a second insulating layer disposed in the first region. An end of the positive electrode substrate and an end of the negative electrode substrate may not overlap. The battery may further include a plurality of turn regions including a first turn region and a second turn region, and the positive electrode substrate, the separator, and the negative electrode substrate are wound in a jelly-roll type configuration. The first region to which the negative active material is not applied may be disposed in a turn region, from among the plurality of turn regions, that is adjacent to a different turn region from among the plurality of turn regions, and the positive electrode tab may be disposed in the different turn region. On the se