US-12620679-B2 - Battery including electrode tab including a wrinkle

US12620679B2US 12620679 B2US12620679 B2US 12620679B2US-12620679-B2

Abstract

The battery disclosed herein includes: a positive electrode plate including a positive electrode substrate and a positive electrode active material layer disposed on the positive electrode substrate; and a negative electrode plate including a negative electrode substrate and a negative electrode active material layer disposed on the negative electrode substrate. At least one of the positive electrode plate or the negative electrode plate has multiple electrode tabs protruding outward from a region of the associated electrode substrate where the associated electrode active material layer is not disposed. The electrode tabs each have an arc-shaped wrinkle.

Inventors

Yu Matsui

Assignees

Prime Planet Energy & Solutions, Inc.

Dates

Publication Date: 20260505
Application Date: 20220822
Priority Date: 20210827

Claims (10)

1 . A battery comprising: a positive electrode plate including a positive electrode substrate and a positive electrode active material layer disposed on the positive electrode substrate; and a negative electrode plate including a negative electrode substrate and a negative electrode active material layer disposed on the negative electrode substrate, wherein at least one of the positive electrode plate or the negative electrode plate has multiple electrode tabs protruding outward from a region of an electrode substrate where an electrode active material layer is not disposed, and the electrode tabs each have an arc-shaped wrinkle, wherein a length of the arc-shaped wrinkle with respect to a width direction, orthogonal to a protruding direction, of the electrode tabs, is shorter than a width of the corresponding electrode tab.
2 . The battery according to claim 1 , wherein the electrode tabs are stacked and bonded to an electrode collecting member.
3 . The battery according to claim 1 , wherein the arc-shaped wrinkle is convex toward a tip of the protruding direction of each of the electrode tabs.
4 . The battery according to claim 1 , wherein the arc-shaped wrinkle has a shape asymmetrical with respect to the width direction orthogonal to the protruding direction of the electrode tabs.
5 . The battery according to claim 1 , wherein the electrode tabs each have multiple linear wrinkles besides the arc-shaped wrinkle.
6 . The battery according to claim 5 , wherein the arc-shaped wrinkle and the linear wrinkles do not intersect.
7 . The battery according to claim 2 , wherein a portion of each of the electrode tabs bonded to the electrode collecting member has the arc-shaped wrinkle.
8 . The battery according to claim 2 , wherein the electrode tabs have different lengths in the protruding direction and are stacked and bonded to the electrode collecting member.
9 . The battery according to claim 2 , wherein the electrode tabs are stacked and bonded to the electrode collecting member, and center portions of the electrode tabs in the width direction are concavely curved toward the electrode collecting member.
10 . The battery according to claim 1 , further comprising a boundary located between the electrode tabs and the electrode substrate, wherein an entirety of the arc-shaped wrinkle is located on a tip of the corresponding electrode tab, wherein the tip protrudes from the boundary located between the electrode tabs and the electrode substrate.

Description

CROSS REFERENCE TO RELATED APPLICATIONS The present application is based upon and claims the benefit of priority from Japanese patent application No. 2021-138687 filed on Aug. 27, 2021, and the entire disclosure of which is incorporated herein in its entirety by reference. BACKGROUND The disclosure relates to a battery. The disclosure further relates to a method of manufacturing an electrode plate and a method of manufacturing a battery. Batteries such as lithium-ion secondary batteries each include an electrode assembly where a positive electrode plate and a negative electrode plate face each other via a separator, for example. Hereafter, these positive and negative electrode plates are collectively referred to as an “electrode plate.” This electrode plate includes: an electrode active material layer forming region where an electrode active material layer containing an electrode active material is formed on an electrode substrate which is a foil-like metal member; and an electrode substrate exposing region where the electrode active material layer is not formed and the electrode substrate is exposed, for example. U.S. Pat. No. 8,956,754 discloses an electrode plate where multiple wrinkles are formed extending from the boundary between the electrode active material layer forming region and the electrode substrate exposing region. The electrode assembly has electrode tab groups where multiple electrode tabs extending outward from the electrode substrate exposing region are stacked at both ends in the long side direction. Such electrode tab groups are connected to electroconductive members such as electrode collecting members. The electrode collecting members are then connected to the electrode terminals. Accordingly, the wound electrode assembly in the battery case and the electrode terminals outside the battery case communicate with each other. SUMMARY However, in such an electrode tab group, if multiple electrode tabs are not stacked in a flat state, so that the thickness of the electrode tab group becomes uneven, the electrode tabs may not be stably welded when connecting to the electroconductive member of the electrode collecting member or the like. For example, if the electrode tabs are stacked with their tips bent, the portions with the bend may be thicker, and the flat portions may be thinner. It was found that this may inhibit stable bonding with the electrode collecting member and the like. The disclosure was made to solve the above problems and to provide a battery in which bending of each electrode tab is reduced and the thickness of the electrode tab group is made uniform and stably bonded to the electrode collecting member. The battery disclosed herein includes: a positive electrode plate including a positive electrode substrate and a positive electrode active material layer disposed on the positive electrode substrate; and a negative electrode plate including a negative electrode substrate and a negative electrode active material layer disposed on the negative electrode substrate. At least one of the positive electrode plate or the negative electrode plate has multiple electrode tabs protruding outward from a region of the associated electrode substrate where the associated electrode active material layer is not f disposed. The electrode tabs each have an arc-shaped wrinkle. The each of electrode tabs have the arc-shaped wrinkle as described above suitably reduce bending of the electrode tabs at their tips. Accordingly, a battery where the thickness of the electrode tab group is unified and the electrode tab group and the electrode collecting member are stably bonded can be provided. In an aspect of the battery disclosed herein, the electrode tabs are bonded to an electrode collecting member with being stacked. With this configuration, the electrode tabs are stacked with the bending thereof reduced and are bonded to the electrode collecting member. Accordingly, a battery where the electrode tab group and the electrode collecting member are stably bonded to each other can be provided. In an aspect of the battery disclosed herein, the arc-shaped wrinkle is convex toward a tip of a protruding direction of each of the electrode tabs. Further, in another aspect, the arc-shaped wrinkle has a shape asymmetrical with respect to a width direction orthogonal to the protruding direction of the electrode tab. With this configuration, bending of the electrode tabs at their tips can be more suitably reduced. This allows the electrode tab group with the uniform thickness where multiple electrode tabs are stacked and the electrode collecting member to be bonded to each other. Accordingly, a highly reliable battery where the electrode tab group and the electrode collecting member are stably bonded to each other can be provided. In an aspect of the battery disclosed herein, the electrode tabs each have multiple linear wrinkles besides the arc-shaped wrinkle. The linear wrinkles formed allow improvement in streng