CN-122000361-A - Electrode member

CN122000361ACN 122000361 ACN122000361 ACN 122000361ACN-122000361-A

Abstract

The 1 st current collector (electrode member) includes an insulating base and a1 st conductive layer provided on a surface of the insulating base. A plurality of fillers for reducing the difference between the linear expansion coefficients of the insulating base and the 1 st conductive layer are dispersed in the insulating base. The difference between the linear expansion coefficient of the insulating substrate in which the plurality of fillers are dispersed and the linear expansion coefficient of the 1 st conductive layer is within + -20% of the linear expansion coefficient of the 1 st conductive layer.

Inventors

TATEISHI TAKASHI
UEDA MASASHI
He Quanrun
Mashioka Shizuka
SATO REI
MACHIDA KEITARO
KATAYAMA YUJI
YAMAMOTO YASUNARI

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260508
Application Date: 20251015
Priority Date: 20241108

Claims (5)

1. An electrode member is provided with: insulating base body, and A conductive layer arranged on the surface of the insulating substrate, A plurality of fillers for reducing the difference between the linear expansion coefficients of the insulating base and the conductive layer are dispersed in the insulating base, The difference between the linear expansion coefficient of the insulating base body in which the plurality of fillers are dispersed and the linear expansion coefficient of the conductive layer is within + -20% of the linear expansion coefficient of the conductive layer.
2. The electrode member according to claim 1, The plurality of fillers are glass fibers.
3. The electrode member according to claim 1, The insulating base includes a main body portion in which active material layers are laminated and a protruding piece portion connected to the main body portion and protruding outward from the main body portion, The plurality of fillers have a long-sized shape, In the protruding piece portion, a longitudinal direction of the plurality of fillers is parallel to a protruding direction of the protruding piece portion.
4. The electrode member according to claim 1, The insulating base includes a main body portion in which active material layers are laminated and a protruding piece portion connected to the main body portion and protruding outward from the main body portion, The plurality of fillers have a long-sized shape, In the protruding piece portion, a longitudinal direction of the plurality of fillers intersects with a protruding direction of the protruding piece portion.
5. The electrode member according to claim 1, The insulating base includes a main body portion in which active material layers are laminated and a protruding piece portion connected to the main body portion and protruding outward from the main body portion, The plurality of fillers have a long-sized shape, In the wound body formed by winding the insulating base, the length direction of the plurality of fillers provided in the main body portion is along the winding direction of the insulating base.

Description

Electrode member Technical Field The present disclosure relates to electrode members. Background Japanese patent application laid-open No. 2019-96592 discloses an electrode member including an insulating base and a conductive layer provided on a surface of the insulating base. Disclosure of Invention In the case where the temperature of such an electrode member changes, the conductive layer is easily peeled off from the insulating base. An object of the present disclosure is to suppress peeling of a conductive layer in an electrode member. An electrode member according to one aspect of the present disclosure includes an insulating base and a conductive layer provided on a surface of the insulating base. A plurality of fillers (fillers) for reducing the difference between the linear expansion coefficients of the insulating base and the conductive layer are dispersed in the insulating base. The difference between the linear expansion coefficient of the insulating base body in which the plurality of fillers are dispersed and the linear expansion coefficient of the conductive layer is within + -20% of the linear expansion coefficient of the conductive layer. Preferably, the plurality of fillers are glass fibers. Preferably, the insulating base includes a main body portion in which the active material layers are laminated, and a protruding piece portion connected to the main body portion and protruding outward from the main body portion. The plurality of fillers have a long-sized shape. In the protruding piece portion, the length direction of the plurality of fillers is parallel to the protruding direction of the protruding piece portion. Preferably, the insulating base includes a main body portion in which the active material layers are laminated, and a protruding piece portion connected to the main body portion and protruding outward from the main body portion. The plurality of fillers have a long-sized shape. In the protruding piece portion, the longitudinal direction of the plurality of fillers intersects with the protruding direction of the protruding piece portion. Preferably, the insulating base includes a main body portion in which the active material layers are laminated, and a protruding piece portion connected to the main body portion and protruding outward from the main body portion. The plurality of fillers have a long-sized shape. In a wound body obtained by winding an insulating base, the length direction of a plurality of fillers provided in a main body portion is along the winding direction of the insulating base. According to the present disclosure, peeling of the conductive layer in the electrode member can be suppressed. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and in which: Fig. 1 is a perspective view showing a battery including an electrode member in the present embodiment; fig. 2 is a sectional view of the electrode body 10 shown in fig. 1, as viewed from the direction of the arrow of line II-II; Fig. 3 is a sectional view of the electrode body 10 shown in fig. 1, as viewed from the direction of the line III-III arrow; FIG. 4 is a partial cross-sectional view showing an enlarged view of a region IV of the 1 st electrode of FIG. 3; FIG. 5 is an expanded view of the insulating base 110 shown in FIG. 4, and Fig. 6 is an expanded view of an insulating base in a modification. Detailed Description Hereinafter, embodiments and modifications of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and the description thereof will not be repeated. Description of the embodiments Fig. 1 is a perspective view showing a battery including an electrode member according to the present embodiment. As shown in fig. 1, a battery 1 including an electrode member in the present embodiment is a so-called square battery. The battery 1 may be a secondary battery configured to be chargeable and dischargeable, such as a lithium ion battery or a nickel metal hydride battery. The battery 1 can be used, for example, as a cell (cell) included in a power storage module mounted on an electric vehicle (ELECTRIFIED VEHICLE). The battery 1 includes an electrode body 10, a case 20, a1 st external terminal 30A, a2 nd external terminal 30B, a1 st connecting member (not shown), a2 nd connecting member (not shown), and an insulating member (not shown). First, the structure of the battery 1 other than the electrode body 10 will be described. The housing 20 has conductivity. The conductive portion of the case 20 is made of a metal such as aluminum. The case 20 houses the electrode body 10. The case 20 also accommodates an electrolyte (not shown). The housing 20 includes a housing main body 21