5 [Technical Field]
The present invention relates to a charging and discharging jig for measuring an
impedance of a battery cell.
More specifically, the present invention relates to a charging and discharging jig for
measuring an impedance, which can consistently keep a length and tension of an electric wire
10 for impedance measurement regardless of a variation in length of the charging and
discharging jig.
The present application claims the benefit of priority based on Korean Patent
Application No. 10-2021-0110464, dated August 20, 2021, and all contents published in the
literature of the Korean patent application are incorporated as a part of the present
15 specification.
[Background Art]
Recently, secondary batteries capable of being charged and discharged have been
widely used as energy sources for wireless mobile devices. In addition, secondary batteries
are gaining attention as energy sources for electric vehicles and hybrid electric vehicles, being
20 proposed as a measure to solve air pollution of conventional gasoline and diesel vehicles
using fossil fuels. Therefore, types of applications using secondary batteries are diversifying
due to the advantages of secondary batteries, and secondary batteries are expected to be
applied in more fields and products in the future.
3
Secondary batteries may be classified into lithium ion batteries, lithium ion polymer
batteries, and lithium polymer batteries according to an electrode and a composition of an
electrolyte, and among these batteries, a use amount of the lithium ion polymer batteries, in
which a probability of leakage of an electrolyte is low and which are easily manufactured, is
5 increasing. Generally, according to a shape of a battery case, a secondary battery is classified
as a cylindrical battery in which an electrode assembly is embedded in a cylindrical metal can,
a square-type battery in which an electrode assembly is embedded in a square-type metal can,
or a pouch-type battery in which an electrode assembly is embedded in a pouch-type case of
an aluminum laminated sheet. The electrode assembly embedded in the battery case is formed
10 as a structure of a positive electrode, a negative electrode, and a separator interposed between
the positive electrode and the negative electrode and is a power generation element capable of
being charged and discharged. The electrode assembly is classified as a jelly-roll type
electrode assembly in which a separator is interposed between a positive electrode and a
negative electrode, which are long sheets coated with an active material, and is wound, or a
15 stack type electrode assembly in which a plurality of positive and negative electrodes, each
having a predetermined size, are sequentially stacked with a separator interposed
therebetween.

[Claims]
[Claim 1]
A charging and discharging jig for measuring an impedance of a battery cell, the
charging and discharging jig comprising:
5 a fixed block provided with a first charging/discharging bus bar on an upper surface
of one side thereof;
an movable block slidably coupled to the fixed block and provided with a second
charging/discharging bus bar on an upper surface of the other side of the movable block
opposite to the one side of the fixed block;
10 a moving block slidably coupled to a bottom surface of the fixed block; and
electric wires fixed to the one side of the fixed block and the other side of the
movable block and configured to extend along bottom surfaces of the fixed block and the
movable block,
wherein a first rod is installed to protrude from a bottom side of the fixed block closer
15 to the movable block than the moving block, and the electric wires extending from the one
side of the fixed block forms first loop having a trajectory that turns on the first rod and
returns to the fixed block,
a second rod is installed to protrude from the moving block, and the electric wires
extending from the first loop forms second loop having a trajectory that turns on the second
20 rod and goes to the movable block, and
when the movable block slides to move with respect to the fixed block, the moving
block is interlocked to the movable block and moved in the same direction as the movable
33
block so that lengths of the first and second loops are adjusted to absorb a variation in tension
of the electric wire.
[Claim 2]
The charging and discharging jig of claim 1, comprising an elastic member of which
5 one end is installed on the one side of the fixed block and the other end is coupled to the
moving block and which applies a force to pull the moving block to the one side of the fixed
block.
[Claim 3]
The charging and discharging jig of claim 2, wherein:
10 the electric wires include a signal line and a sensing line which extend in parallel
along both sides of the fixed block and the movable block in the width direction;
the first rod is configured as a first rod pair including a first signal line rod and a
first sensing line rod which are installed on both sides of the fixed block in the width
direction; and
15 the moving block is installed between the first signal line rod and the first sensing line
rod, and the second rod is configured as a second rod pair including a second signal line rod
and a second sensing line rod which are installed on both sides of the moving block in the
width direction.
[Claim 4]
20 The charging and discharging jig of claim 3, wherein the movable block is slidably
coupled to an upper surface of the fixed block.
[Claim 5]
34
The charging and discharging jig of claim 1, wherein guide slits are formed on both
sides of one of the fixed block and the movable block in the width direction, and sliding
support members inserted into the guide slits are installed in the other of the fixed block and
the movable block.