US-12625190-B2 - Voltage detection unit and power storage device

US12625190B2US 12625190 B2US12625190 B2US 12625190B2US-12625190-B2

Abstract

A voltage detection unit includes: a voltage detection terminal having a first location configured to be conductively connected to a detection target; a plate-shaped housing having a terminal accommodating recess accommodating the voltage detection terminal; a cover configured to be locked to the housing at a temporary locking position where the first location of the voltage detection terminal accommodated in the terminal accommodating recess is not covered and a final locking position where the first location is covered; a temperature measurer accommodating a temperature-measuring element and attached to the housing; and an electric wire conductively connected to a second location of the voltage detection terminal and drawn out to the outside of the housing. The temperature measurer is arranged such that at least a part of the temperature measurer is overlapped with the voltage detection terminal in a plate thickness direction of the housing.

Inventors

Yutaro Okazaki
Seigo Mochizuki
Shinichi Yanagihara
Satoshi Morioka
Hiroyuki Kaiya
Hiromi Ueda
Shinpei MUNE
Naoto Morisaku
Yutaro Kawabata
Daiki Tanaka

Assignees

YAZAKI CORPORATION
TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date: 20260512
Application Date: 20240606
Priority Date: 20230628

Claims (5)

1 . A voltage detection unit comprising: a voltage detection terminal having a first location configured to be conductively connected to a detection target; a plate-shaped housing having a terminal accommodating recess accommodating the voltage detection terminal; a cover configured to be locked to the housing at a temporary locking position where the first location of the voltage detection terminal accommodated in the terminal accommodating recess is not covered and a final locking position where the first location is covered; a temperature measurer accommodating a temperature-measuring element and attached to the housing; and an electric wire conductively connected to a second location of the voltage detection terminal and drawn out to the outside of the housing, wherein the temperature measurer is arranged such that at least a part of the temperature measurer is overlapped with the voltage detection terminal in a plate thickness direction of the housing to restrict the voltage detection terminal accommodated in the terminal accommodating recess from moving in the plate thickness direction.
2 . The voltage detection unit according to claim 1 , wherein: the voltage detection terminal has a third location extending in the plate thickness direction; and the temperature measurer is arranged adjacent to the third location.
3 . The voltage detection unit according to claim 1 , wherein the voltage detection terminal has a shape that does not interfere with the housing between an accommodation position where the voltage detection terminal is accommodated in the terminal accommodating recess and an external position where the voltage detection terminal is assumed as moved away from the housing in the plate thickness direction from the accommodation position.
4 . A power storage device comprising: a board-shaped conductive module including the voltage detection unit according to claim 1 and a conductive board as the detection target to which the voltage detection terminal is conductively connected; and a power storage module configured to be charged and discharged, on which the conductive module is stacked.
5 . The voltage detection unit according to claim 1 , wherein the temperature measurer is mounted in a mounting recess formed in the housing.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is based upon and claims the benefit of priority from prior Japanese patent application No. 2023-106245 filed on Jun. 28, 2023, the entire contents of which are incorporated herein by reference. BACKGROUND 1. Field of the Invention The present disclosure relates to a voltage detection unit configured such that a voltage detection terminal to be conductively connected to a detection target is accommodated in a board-shaped housing, and a power storage device using the voltage detection unit. 2. Description of the Related Art The related art has proposed a stacked power storage device in which a plurality of chargeable and dischargeable thin power storage modules are connected in series via conductive boards by alternately arranging and repeatedly stacking the board-shaped power storage modules and the conductive boards. The power storage modules used in this type of power storage device generally have a structure in which a plurality of battery cells are incorporated, and function as one battery capable of charging and discharging. In one of the power storage devices of the related arts, in order to monitor the output state of each power storage module (that is, the potential of the output face of each power storage module relative to the zero potential as a reference; hereinafter, simply referred to as “voltage of the power storage module”), a detection terminal such as a bus bar is connected to the conductive board in contact with the output face of the power storage module, and the voltage of the power storage module is measured through the detection terminal (for example, see JP2020-161340A). However, when actually connecting the bus bar or the like to the conductive board in the power storage device having the above-described structure, since the power storage modules and the conductive boards have a thin plate shape, it is difficult to secure a space for installing the other components for connection (for example, bolts for bolt fastening or the like). Therefore, the power storage device of the related art described above is provided with an insertion hole for inserting the detection terminal in the side edge of each conductive board. The detection terminal is inserted into the insertion hole of the conductive board from the lateral side of the stacked body in which the power storage modules and the conductive boards are stacked, thereby connecting the conductive board and the detection terminal. However, according to this connection method of the related art, the positioning between the insertion hole of the conductive board and the detection terminal is complicated when inserting the detection terminal, which makes it difficult to improve the workability of connection work. SUMMARY An object of the present disclosure is to provide a voltage detection unit excellent in workability in a conductive connection with a detection target, and a power storage device using the voltage detection unit. In order to achieve the object described above, a voltage detection unit and a power storage device according to the present disclosure are characterized as follows. According to an aspect of the present disclosure, there is provided a voltage detection unit including: a voltage detection terminal having a first location configured to be conductively connected to a detection target; a plate-shaped housing having a terminal accommodating recess accommodating the voltage detection terminal; a cover configured to be locked to the housing at a temporary locking position where the first location of the voltage detection terminal accommodated in the terminal accommodating recess is not covered and a final locking position where the first location is covered; a temperature measurer accommodating a temperature-measuring element and attached to the housing; and an electric wire conductively connected to a second location of the voltage detection terminal and drawn out to the outside of the housing, in which the temperature measurer is arranged such that at least a part of the temperature measurer is overlapped with the voltage detection terminal in a plate thickness direction of the housing to restrict the voltage detection terminal accommodated in the terminal accommodating recess from moving in the plate thickness direction. According to another aspect of the present disclosure, there is provided a power storage device including: a board-shaped conductive module including the voltage detection unit and a conductive board as the detection target to which the voltage detection terminal is conductively connected; and a power storage module configured to be charged and discharged, on which the conductive module is stacked. According to the voltage detection unit and the power storage device according to the present disclosure, the cover can be locked to the housing while accommodating the voltage detection terminal whose second location is connected to the electric w