US-20260128452-A1 - WIRING MODULE

US20260128452A1US 20260128452 A1US20260128452 A1US 20260128452A1US-20260128452-A1

Abstract

A wiring module is to be attached to a battery stack configured by stacking a plurality of laminated batteries including electrode leads, the battery stack including a joining portion formed by overlapping and joining the electrode leads of the laminated batteries, and provided with a terminal, a wire to be connected to the terminal, and a protector for holding the terminal and the wire. The terminal includes a body portion, a connecting portion extending from the body portion and facing and connected to the electrode leads constituting the joining portion in a first direction, and a bent plate portion connected to the body portion via a bent portion and extending toward the laminated batteries in the first direction.

Inventors

Kotaro Takada
Osamu Nakayama
Katsushi Miyazaki
Daiki TSUJI

Assignees

AUTONETWORKS TECHNOLOGIES, LTD.
SUMITOMO WIRING SYSTEMS, LTD.
SUMITOMO ELECTRIC INDUSTRIES, LTD.

Dates

Publication Date: 20260507
Application Date: 20231002
Priority Date: 20221006

Claims (9)

1 . A wiring module to be attached to a battery stack configured by stacking a plurality of laminated batteries including electrode leads, the battery stack including a joining portion formed by overlapping and joining the electrode leads of the laminated batteries, comprising: a terminal; a wire to be connected to the terminal; and a protector for holding the terminal and the wire, the terminal including a body portion, a connecting portion extending from the body portion and facing and connected to the electrode leads constituting the joining portion in a first direction, and a bent plate portion connected to the body portion via a bent portion and extending toward the laminated batteries in the first direction, the protector including a protector body, a recess recessed toward the laminated batteries in the first direction with respect to the protector body, the recess accommodating the bent plate portion, and at least one deflection piece extending from the protector body and deflectable and deformable in a second direction orthogonal to the first direction, the deflection piece including a plurality of plate portions extending in the first direction and arranged apart in the second direction and at least one coupling portion coupling end parts in the first direction of two adjacent ones of the plate portions, the plurality of plate portions including at least a base end side plate portion to be connected to the protector body and a tip side plate portion disposed to face the terminal, the tip side plate portion including a locking portion to be disposed in the recess and locked to the bent plate portion from a side opposite to the laminated batteries in the first direction, and the deflection piece having a bellows shape by alternately connecting the plate portions and the coupling portion from the base end side plate portion to the tip side plate portion.
2 . The wiring module according to claim 1 , wherein: the protector is formed with a plurality of electrode accommodation recesses penetrating through the protector body in the first direction, the electrode accommodation recesses receiving the electrode leads, the plurality of electrode accommodation recesses are arranged in a third direction orthogonal to both the first and second directions, and the deflection piece is disposed between two adjacent ones of the electrode accommodation recesses.
3 . The wiring module according to claim 1 , wherein the tip side plate portion is connected to the coupling portion on an end part opposite to the laminated batteries in the first direction.
4 . The wiring module according to claim 1 , wherein: the tip side plate portion includes a locking projection projecting from the tip side plate portion toward a side opposite to the base end side plate portion in the second direction, the locking projection includes the locking portion disposed on the laminated battery side in the first direction and an inclined portion disposed further on the side opposite to the laminated batteries in the first direction than the locking portion, and the inclined portion is located more away from the base end side plate portion in the second direction toward the laminated batteries in the first direction.
5 . The wiring module according to claim 1 , wherein the tip side plate portion is located more away from the base end side plate portion in the second direction toward the laminated batteries in the first direction.
6 . The wiring module according to claim 1 , wherein: the protector includes a guide portion disposed to be continuous with an inner wall of the recess further on a side opposite to the laminated batteries in the first direction than the recess, and the guide portion is inclined inwardly of the recess toward the laminated batteries in the first direction.
7 . The wiring module according to claim 1 , wherein the protector includes a deflection piece accommodation recess recessed from the protector body toward the laminated batteries in the first direction, the deflection piece accommodation recess accommodating a part of the deflection piece.
8 . The wiring module according to claim 7 , wherein: an inner wall constituting the deflection piece accommodation recess extends in the first direction and includes a pair of slits disposed side by side in a third direction orthogonal to both the first and second directions, and the inner wall disposed between the pair of slits serves as the base end side plate portion.
9 . The wiring module according to claim 1 , wherein: the terminal is formed with at least one opening penetrating through the bent plate portion, and an opening edge part of the opening includes a lock receiving portion to be locked to the locking portion.

Description

TECHNICAL FIELD The present disclosure relates to a wiring module. BACKGROUND In a high-voltage battery pack used in an electric vehicle, a hybrid vehicle or the like, a multitude of battery cells are normally stacked and electrically connected in series or in parallel by a wiring module. A wiring module described in Japanese Patent Laid-Open Publication No. 2020-527848 (Patent Document 1 below) has been conventionally known as such a wiring module. A battery module described in Patent Document 1 is provided with a cell assembly, in which a plurality of battery cells each including electrode leads in front and rear end parts are stacked in a lateral direction, a module housing configured to accommodate the cell assembly in an internal space formed by four upper, lower, left and right side walls, and end frames assembled in front of and behind the cell assembly to connect the cell assembly to an external device. PRIOR ART DOCUMENT Patent Document Patent Document 1: JP 2020-527848 A SUMMARY OF THE INVENTION Problems to be Solved In the above configuration, since the cell assembly includes parts where the electrode leads of the adjacent battery cells are bent toward each other, overlapped and electrically connected, it is not necessary to provide busbars for connecting the electrode leads. The electrode leads are electrically connected to module terminals provided in the end frames. In the above configuration, the electrode leads and the module terminals can be connected by laser welding. In consideration of laser welding efficiency, the module terminals are preferably thin. On the other hand, if the module terminals are thin, the module terminals may be bent when being mounted into the end frames. Means to Solve the Problem The present disclosure is directed to a wiring module to be attached to a battery stack configured by stacking a plurality of laminated batteries including electrode leads, the battery stack including a joining portion formed by overlapping and joining the electrode leads of the laminated batteries, the wiring module being provided with a terminal, a wire to be connected to the terminal and a protector for holding the terminal and the wire, the terminal including a body portion, a connecting portion extending from the body portion and facing and connected to the electrode leads constituting the joining portion in a first direction and a bent plate portion connected to the body portion via a bent portion and extending toward the laminated batteries in the first direction, the protector including a protector body, a recess recessed toward the laminated batteries in the first direction with respect to the protector body, the recess accommodating the bent plate portion, and at least one deflection piece extending from the protector body and deflectable and deformable in a second direction orthogonal to the first direction, the deflection piece including a plurality of plate portions extending in the first direction and arranged apart in the second direction and at least one coupling portion coupling end parts in the first direction of two adjacent ones of the plate portions, the plurality of plate portions including at least a base end side plate portion to be connected to the protector body and a tip side plate portion disposed to face the terminal, the tip side plate portion including a locking portion to be disposed in the recess and locked to the bent plate portion from a side opposite to the laminated batteries in the first direction, and the deflection piece having a bellows shape by alternately connecting the plate portions and the coupling portion from the base end side plate portion to the tip side plate portion. Effect of the Invention According to the present disclosure, it is possible to provide a wiring module in which a terminal is hardly deformed when being mounted into a protector. BRIEF DESCRIPTION OF THE DRAWINGS DETAILED DESCRIPTION TO EXECUTE THE INVENTION Description of Embodiments of Present Disclosure FIG. 1 is a perspective view showing a front part of a power storage module according to a first embodiment. FIG. 2 is a front view of the power storage module. FIG. 3 is a view enlargedly showing the periphery of a terminal in FIG. 2. FIG. 4 is a section along A-A of FIG. 2. FIG. 5 is a section along B-B of FIG. 3. FIG. 6 is a section along B-B of FIG. 3 showing a first position of the terminal. FIG. 7 is a section along B-B of FIG. 3 showing a second position of the terminal. FIG. 8 is a section along B-B of FIG. 3 without the terminal. FIG. 9 is a section along C-C of FIG. 3. FIG. 10 is a section along D-D of FIG. 5. FIG. 11 is a perspective view showing the periphery of a terminal accommodating portion in the power storage module. FIG. 12 is a view with the terminal in FIG. 11 omitted. FIG. 13 is a perspective view of a front part of a battery stack. FIG. 14 is a perspective view showing an essential part of a laminated battery. FIG. 15 is a perspective view showing the