【Technical Field】
[1] This application claims the benefit of priority
to Korean Patent Application No. 2021-0041333 filed on
March 30, 2021, the disclosure of which is incorporated
herein by reference in its entirety.
[2] The present invention relates to an all-solidstate battery including a porous current collector and a
battery module including the same. More particularly,
the present invention relates to an all-solid-state
battery including a porous current collector configured
such that a change in thickness of the battery due to
lithium plating and stripping is alleviated and a battery
module including the same.
【Background Art】
[3] A lithium secondary battery, which is
rechargeable and has high energy density, has attracted
attention as a new energy source that has environmentally
friendly characteristics, since the lithium secondary
battery not only remarkably reduces the use of fossil
2
fuels but also does not generate by-products as the
result of the use of energy.
[4] The lithium secondary battery has also been
spotlighted as an energy source for devices having high
output and high energy density, such as electric vehicles,
as well as wearable devices or portable devices. As a
result, research on a lithium secondary battery that has
high operating voltage and energy density has been
conducted at a rapid rate.
[5] A lithium ion secondary battery including an
electrolytic solution and a separator, which is a kind of
lithium secondary battery, has shortcomings in that there
are high dangers of electrolytic solution leakage and
fire outbreak. As an alternative thereto, an all-solidstate battery, which uses a nonflammable solid as an
electrolyte, whereby dangers of fire outbreak and
explosion are low, has been proposed.
[6] The all-solid-state battery has advantages in
that safety is improved, the movement speed of lithium
ions is high since a solid electrolyte is used, and the
thickness of a negative electrode is reduced, whereby
energy density is increased.
[7] As a means configured to increase the energy
density of the all-solid-state battery, a negative
electrode constituted by a current collector alone
3
without inclusion of a negative electrode mixture layer
has been proposed.
[8] When an all-solid-state battery including a
negative electrode having no negative electrode mixture
layer is charged, lithium ions move from a positive
electrode to the negative electrode, and lithium is
plated on a negative electrode current collector at the
part at which the negative electrode current collector
and a solid electrolyte layer contact each other. When
the all-solid-state battery is discharged, the lithium
plated on the negative electrode current collector is
stripped off. In the above process, the volume of the
all-solid-state battery may be changed.
[9] In addition, the size of the lithium plated on
the negative electrode current collector may be gradually
increased as the result of repetitive charging and
discharging of the all-solid-state battery, and lithium
dendrites may grow through an aperture of the solid
electrolyte layer. The lithium dendrites may cause short
circuit in the battery or may reduce the capacity of the
battery.

【CLAIMS】
【Claim 1】 An all-solid-state battery comprising:
a positive electrode comprising a positive electrode
current collector coated with a positive electrode
mixture layer;
a negative electrode comprising a negative electrode
current collector having a porous structure;
a solid electrolyte layer located between the
positive electrode and the negative electrode;
a stopper disposed at an outer periphery of the
negative electrode;
a battery case accommodating an electrode assembly
comprising the positive electrode, the negative electrode,
and the solid electrolyte layer, and the stopper; and
a pressing member disposed at each of opposite
surfaces of the battery case which are parallel to planes
of the positive electrode and the negative electrode
respectively, the pressing member pressing in a direction
toward an inside of the battery case,
wherein a height of the stopper is equal to or less
than a thickness of the negative electrode before
pressing.
【Claim 2】 The all-solid-state battery according to
41
claim 1, wherein the negative electrode current collector
is formed of a metal material.
【Claim 3】 The all-solid-state battery according to
claim 1, further comprising a stopper disposed at an
outer periphery of the positive electrode.
【Claim 4】 The all-solid-state battery according to
claim 1, wherein the stopper is disposed perpendicular to
a pressing surface of the pressing member.
【Claim 5】 The all-solid-state battery according to
claim 1, wherein the height of the stopper is less than
the thickness of the negative electrode before pressing.
【Claim 6】 The all-solid-state battery according to
claim 1, wherein a length of the stopper corresponds to
a length of the outer periphery of the negative
electrode at which the stopper is disposed.
【Claim 7】 The all-solid-state battery according to
claim 1, wherein an original form of the stopper is
maintained when the battery case is pressed by the
pressing member.