Battery cell having battery casing with receiving part and electrode lead groove

Patent metadata

Field	Value
Publication number	US-11855296-B2
Application number	US-201716076430-A
Country	US
Kind code	B2
Filing date	Sep 28, 2017
Priority date	Sep 28, 2016
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

Disclosed in a battery cell including: an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes, with electrode tabs protruding from at least one side of outside peripheral portions of the electrode assembly; and a battery casing including first and second casings provided with first and second receiving parts, respectively, the first and second receiving parts respectively accommodating the electrode assemblies and having different sizes or shapes, wherein in a state in which electrode leads connected to the electrode tabs protrude from outside peripheral portions of the first and second casings, the battery casing is sealed by thermal fusion along the outside peripheral portions of the first and second casings, wherein electrode lead grooves recessed downwardly such that the electrode leads are seated therein are provided at a portion of the outside peripheral portions of the first and second casings.

First claim

What is claimed is:

1. A battery cell, comprising:
an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, with electrode tabs protruding from at least one side of outside peripheral portions of the electrode assembly, each electrode tab being made of metal; and
a battery casing made of elongatable material including a first casing and a second casing provided with a first receiving part and a second receiving part, respectively, the first and second receiving parts respectively accommodating the electrode assembly and having different sizes or shapes, each of the first casing and the second casing being a laminate sheet including a metal layer and a resin layer,
wherein electrode lead grooves are formed at a portion of outside peripheral portions of each of the first and second casings, respectively, which correspond to one another, where electrode leads protrude, the electrode lead grooves being recessed downwardly such that the electrode leads are seated therein, and, prior to sealing the battery casing by thermal fusing, a total depth obtained by adding a depth of the electrode lead grooves formed at the first casing and a depth of the electrode lead grooves formed at the second casing is smaller than a thickness of the electrode
wherein a width of each lead groove at a top surface of the peripheral portion to a bottommost surface of the groove is constant,
wherein in a state in which the first casing is arranged to overlap the second casing and the electrode leads seated in the electrode lead grooves are connected to the electrode tabs protrude from the outside peripheral portions of the first and second casings, the battery casing is sealed by thermal fusion along the outside peripheral portions of the first and second casings,
wherein the electrode lead grooves are elongated by thermal fusion, and
wherein the electrode leads have a constant thickness and the metal of the electrode leads directly contact the resin layer of the first casing and the resin layer of the second casing.

2. The battery cell of claim 1 , wherein the battery casing is configured such that the first and second casings are integrated into a single unit at a predetermined portion of the outside peripheral portions, the first and second casings being configured such that in a state in which the first and second casings are folded at the predetermined portion, remaining portions of the outside peripheral portions are sealed by thermal fusion to each other, such that the first and second receiving parts accommodate the electrode assembly, respectively.

3. The battery cell of claim 2 , wherein at the predetermined portion where the first and second casings are integrated into the single unit, a distance between the first and second receiving parts is in a range of 1.0 to 2.0 millimeters.

4. The battery cell of claim 1 , wherein the first and second casings are configured as separated members, and all the outside peripheral portions are sealed by thermal fusion.

5. The battery cell of claim 1 , wherein the first receiving part, or the second receiving part, or both the first receiving part and the second receiving part include at least one inner peripheral surface having a tapered structure in which width becomes gradually narrower outwards in a vertical cross section.

6. The battery cell of claim 1 , wherein the total depth obtained by adding the depth of the electrode lead grooves formed at the first casing and the depth of the electrode lead grooves formed at the second casing is 50 to 99% with respect to the thickness of the electrode leads.

7. The battery cell of claim 1 , wherein the depth of the electrode lead grooves formed at the first casing and the depth of the electrode lead grooves formed at the second casing are equal to each other.

8. The battery cell of claim 1 , wherein the electrode assembly includes:
a first unit cell having a structure corresponding to an inside shape of the first receiving part; and
a second unit cell having a structure corresponding to an inside shape of the second receiving part.

9. The battery cell of claim 8 , wherein at least one of the first and second unit cells is configured such that a positive electrode plate and a negative electrode plate are stacked with a separator interposed therebetween.

10. The battery cell of claim 8 , wherein at least one of the first and second unit cells is configured such that a positive electrode sheet and a negative electrode sheet are wound with a separator sheet interposed therebetween in one direction.

11. The battery cell of claim 8 , wherein at least one of the first and second unit cells is configured such that a plurality of basic units each including a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound using a separator sheet interposed between each of the basic units.

12. The battery cell of claim 8 , wherein the first and second unit cells are configured such that a plurality of basic units of both the first and second unit cells are simultaneously wound using a single separator sheet interposed between each of the basic units, each of the basic units including a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate.

13. A battery cell, comprising:
an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, with electrode tabs protruding from at least one side of outside peripheral portions of the electrode assembly, each electrode tab being made of metal; and
a battery casing made of elongatable material including a first casing and a second casing provided with a first receiving part and a second receiving part, respectively, the first and second receiving parts respectively accommodating the electrode assembly and having different sizes or shapes, each of the first casing and the second casing being a laminate sheet including a metal layer and a resin layer,
wherein electrode lead grooves are formed at a portion of outside peripheral portions of each of the first and second casings, respectively, which correspond to one another, where electrode leads protrude, the electrode lead grooves being recessed downwardly such that the electrode leads are seated therein, and, prior to sealing the battery casing by thermal fusing, a total depth obtained by adding a depth of the electrode lead grooves formed at the first casing and a depth of the electrode lead grooves formed at the second casing is smaller than a thickness of the electrode leads,
wherein a sidewall of each electrode lead groove connecting a top surface of the peripheral portion to a bottommost surface is straight,
wherein in a state in which the first casing is arranged to overlap the second casing and the electrode leads seated in the electrode lead grooves are connected to the electrode tabs protrude from the outside peripheral portions of the first and second casings, the battery casing is sealed by thermal fusion along the outside peripheral portions of the first and second casings,
wherein the electrode lead grooves are elongated by thermal fusion, and
wherein the electrode leads have a constant thickness and the metal of the electrode leads directly contact the resin layer of the first casing and the resin layer of the second casing.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Kwon Soon-Kwan
• Ryu Sang-Baek
• Cho Shin-Hyo

Classifications

• H01M50/124 Primary

  having a layered structure · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/121

  Organic material · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title