Power supply device, and electric vehicle and power storage device equipped with this power supply device
A power supply device includes battery stack in which a plurality of battery cells are stacked, and a plurality of battery modules including cell monitor circuits that detect battery information of battery cells, and cell monitor circuits of the battery modules are cascade-connected via communication lines. Battery module includes a pair of communication terminals that are arranged at both ends and are connected to cell monitor circuit, and inner wires that connect the pair of communication terminals positioned at both the ends. Communication line is connected to communication terminal, and cell monitor circuits of the plurality of battery modules are cascade-connected.
1 . A power supply device comprising
a plurality of battery modules including:
battery stacks including a plurality of battery cells stacked; and
cell monitor circuits that detect battery information of the plurality of battery cells,
communication lines connecting the cell monitor circuits of the plurality of battery modules being cascade-connected to each other, and
a voltage detection line that connects the plurality of battery cells constituting the battery stack and the cell monitor circuits,
wherein each of the plurality of battery modules includes:
a pair of communication terminals, the communication terminals being arranged at both ends of each of the plurality of the battery modules, and one of the pair of communication terminals being connected to the cell monitor circuit,
an inner wire that connects the pair of communication terminals positioned at both the ends to each other; and
a cover case that covers the inner wire,
the communication lines are connected to the communication terminals,
the inner wire is wired inside the cover case,
the inner wire is a group of lines including a plurality of communication wires parallel to the voltage detection line, and
the groups of lines is a flexible printed board wiring the voltage detection line and the inner wire.
2 . The power supply device according to claim 1 , wherein
the plurality of battery modules are connected in series via power lines, and
the plurality of battery modules connected in series via the power lines are cascade-connected via the communication lines.
3 . The power supply device according to claim 2 , wherein
the plurality of battery modules comprises a pair of battery modules among the plurality of battery modules arranged in a straight line,
output terminals at ends opposing each other of the pair of battery modules are connected by one of the power lines, and
the pair of communication terminals at ends opposing each other of the pair of battery modules are connected via one of the communication lines.
4 . The power supply device according to claim 2 , wherein
the plurality of battery modules comprises a pair of battery modules arranged adjacent to each other in parallel,
output terminals of ends approaching each other are connected by one of the power lines, and
the pair of the communication terminals of ends approaching each other are connected via one of the communication lines.
5 . The power supply device according to claim 1 , wherein
each of the plurality of battery modules includes
a battery assembly arranging each of the battery stacks between a pair of end plates, and
the cell monitor circuits are arranged on the end plates.
6 . The power supply device according to claim 5 , wherein the pair of communication terminals are arranged on the end plates.
7 . The power supply device according to claim 6 , wherein
one of the cell monitor circuits is arranged on one of the end plates of each of the battery module, and
the pair of communication terminals is arranged on the one of the cell monitor circuits arranged on one of end plates and one of the end plates where the one of the cell monitor circuits is not arranged.
8 . The power supply device according to claim 7 , wherein
the pair of communication terminals provided on the end plates are relay connectors, and
each of the relay connectors connects the inner wire and each of the communication lines.
9 . The power supply device according to claim 1 , wherein the pair of communication terminals comprises a connector that detachably connects the communication line.
10 . An electric vehicle comprising:
the power supply device according to claim 1 ;
a motor for travelling that receives electric power from the power supply device;
a vehicle body on which the power supply device and the motor are mounted; and
wheels that are driven by the motor and cause the vehicle body to travel.
11 . A power storage device comprising:
the power supply device according to claim 1 ; and
a power supply controller that controls charging and discharging of the power supply device,
wherein the power supply controller enables charging of the battery cells with electric power from outside, and controls charging to be performed on the battery cells.
12 . The power supply device according to claim 1 , wherein
the plurality of battery modules comprises a first battery module and a second battery module arranged adjacent to the first battery module,
one of the pair of communication terminals of the first battery module is connected to the other of the pair of communication terminals of the second battery module via the communication line directly.
13 . The power supply device according to claim 1 , wherein
the inner wire comprises a pair of inner wires, and
the pair of inner wires are provided horizontally between an upper surface of stacked battery cells and the cover case.
14 . The power supply device according to claim 1 , wherein the cell monitor circuit defines a connection terminal opening at an upper end thereof to receive a connector of the inner wire.