A flexible printed circuit board includes an electrically conductive line and a land that is connected to the electrically conductive line and to be connected to a terminal. The land includes soldering portions that have metal surfaces and to which the terminal is to be soldered. A dividing section is between the soldering portions and the dividing section has a non-metal surface and defines each of the soldering portions that are adjacent to each other.

A flexible printed circuit board including a terminal includes a flexible printed circuit board that includes an electrically conductive line and the terminal soldered to the flexible printed circuit board. The flexible printed circuit board includes a land and a soldering restricting section. The land is electrically connected to the electrically conductive line and has a metal surface and is soldered to the terminal. The soldering restricting section has a non-metal surface and is not soldered to the terminal. The terminal includes an overlapping section and a protrusion section. The overlapping section overlaps the land and is soldered to the land and includes a removed section that is formed in such a manner that a portion is partially removed in a predefined area. The protruding section is continuous from the overlapping section and protrudes to an area that does not overlap the flexible printed circuit board.

A battery pack includes at least one battery unit. The battery unit includes at least one battery string. The battery string includes one or at least two cells. A voltage difference across the battery string is less than or equal to 60 V. When the battery string includes at least two cells, the cells in the battery string are arranged sequentially along a first direction, and the first direction is parallel to a direction from the tail of the vehicle to the head of the vehicle.

This embodiment provides an energy storage apparatus that includes: a plurality of energy storage devices, each having an external terminal; and a bus bar configured to conductively connect the external terminals to each other between different ones of the plurality of energy storage devices. The bus bar includes a pair of connecting portions, each placed on the external terminal. Each of the pair of connecting portions includes a plurality of curved welded portions, each formed in a curved shape that convexly curves inward in a first direction where the pair of connecting portions are aligned. The plurality of curved welded portions are formed to be aligned in the first direction.

Provided is a battery pack including: a plurality of battery cells; a first conductive plate arranged over the plurality of battery cells and electrically connecting the plurality of battery cells; a second conductive plate arranged over the first conductive plate to overlap a portion of the first conductive plate and electrically connecting the plurality of battery cells; and an insulating layer arranged between the first conductive plate and the second conductive plate.

Provided is a battery pack including: a plurality of battery cells; a first conductive plate arranged over the plurality of battery cells and electrically connecting the plurality of battery cells; a second conductive plate arranged over the first conductive plate to overlap a portion of the first conductive plate and electrically connecting the plurality of battery cells; and an insulating layer arranged between the first conductive plate and the second conductive plate.

There is provided a battery system including parallel-connected bus bars each connecting the plurality of prismatic battery cells in parallel, and a safety mechanism configured to be capable of interrupting a current path of prismatic battery cells connected in parallel by the parallel-connected bus bars, where the sealing plate of one of the prismatic battery cells convexly deforms due to a rise in an internal pressure of this prismatic battery cell when an abnormality occurs, the sealing plate that has convexly deformed comes into contact with the parallel-connected bus bars to form external short circuitry between the electrode terminals that are positive and negative of one prismatic battery cell connected in parallel to the prismatic battery cell with the abnormality, and external short circuitry activates the safety mechanism that interrupts a current flowing into the prismatic battery cell with the abnormality.

A power storage module includes power storage elements having electrode surfaces of positive electrode surfaces and negative electrode surfaces on front and back surfaces thereof, a conductive member electrically connected to the electrode surfaces of the power storage elements, and a wiring module electrically connected to the conductive member. The power storage elements are arranged in an arrangement direction such that the electrode surfaces of the power storage elements that are adjacent to each other are opposed to each other. The electrode surfaces of the power storage elements that are adjacent to each other are electrically connected by the conductive member that is disposed between the power storage elements that are adjacent to each other. The wiring module is disposed between the power storage elements that are adjacent to each other. The conductive member and the wiring module are disposed inside an outline of the power storage elements seen from the arrangement direction.

A battery wiring module includes a plurality of connecting members to be connected to electrode terminals and a flexible printed circuit board having a plurality of voltage detection lines for detecting the voltages of a plurality of power storage elements via the plurality of connecting members, at least one of the plurality of voltage detection lines being constituted to include a front surface wiring and a back surface wiring respectively formed on a front surface and a back surface of the flexible printed circuit board, and a front-back conduction part passing through the flexible printed circuit board in the plate thickness direction and connecting the front surface wiring and the back surface wiring, and the resistance value per unit length of the front-back conduction part being less than or equal to the maximum resistance value per unit length of the front surface wiring and the back surface wiring.

A switch assembly for a battery module comprises a base unit, a first plug, and a second plug. The base unit defines a socket in which are located first and second positive contacts and first and second negative contacts. The first plug is configured to be inserted into the socket and comprises a first connector operable to connect the first positive contact to the second positive contact and a second connector operable to connect the first negative contact to the second negative contact when the first plug is inserted into the socket. The second plug comprises a connector operable to connect only the first positive contact to the second negative contact when the second plug is inserted into the socket.