NOVELTY - The module i.e. battery module (110), has an electrical storage unit connecting conductors electrically connecting a set of electrical storage units i.e. battery cells (10). A voltage detection line unit i.e. subunit, is electrically connected to the electrical storage units. The voltage detection line unit includes voltage detection lines for detecting the voltage of the electrical storage units. The detection lines are electrically connected to the electrical storage units when the electrical storage unit connecting conductors are mechanically connected to the electrical storage units.    USE - Electrical storage module i.e. battery module, for use in an electrical storage device e.g. battery device such as lithium ion battery device, configuring a power supply of a vehicle e.g. electrical automobile such as PHEV, for storing and discharging electrical energy to an internal combustion engine for driving electrical components e.g. car audio including a radio, a car navigation device and lights, computer system and a server system, in-house power generation facility and power plant utilizing natural energy including sunlight, wind power, and geothermal power. Can also be used for a hybrid electrical vehicle (HEV), electrical vehicle (EV), railway vehicle e.g. hybrid electrical train, bus and lorry and an industrial vehicle such as battery forklift lorry.    ADVANTAGE - The module utilizes a bus bar that is mechanically connected to a battery cell, while the voltage detection line is electrically connected to the battery cell, thus avoiding an operation of connecting the voltage detection line to the battery cell in the procedure for assembling the battery module, and hence improving assembly workability of the battery module and reducing manufacturing cost of the battery module. The module utilizes an insertable relay terminal for mechanical and electrical connection between the bus bar terminal of the bus bar and the voltage detection terminal, thus negating need of joining such as welding, complicating workability, and hence improving manufacturability of the voltage detection line unit. The voltage detecting conductors are printed on the flexible printed circuit board as the voltage detection line, thus improving handling, facilitating downsizing and reducing in weight, and hence allowing manufacturability of the voltage detection line unit to be improved and facilitating downsizing and reduction in weight. The module allows the cell controller to be protected from the abnormal current from the battery cell and enables reliability and safety of the battery device. The module provides a fuse integrally for the voltage detection line, thus allowing an operation of connecting the fuse to be omitted in the procedure for assembling the battery module, and hence enabling reduction of manufacturing cost of the battery module due to simplification of the procedure for assembling the battery module. The module utilizes a U-shaped elastic member for the voltage detection terminal and the U-shaped elastic member for the connector terminal connected between the voltage detection line, the voltage detection terminal and the connector terminal, thus enabling the voltage detection line to be replaceable and allowing the entire components of the voltage detection line unit to be reusable except for the voltage detection line, and hence providing excellent replaceability of components, recyclability and environmentality, and facilitating reduction in cost of the battery module.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a configuration of a drive system of a plug-in hybrid vehicle.    Plug-in hybrid electrical vehicle (1)    Driven wheels (2)    Axle shaft (3)    Clutch (5)    Battery cells (10)    Battery module (110)    Motor/generator (200)