All-solid-state battery system provided with pressurizing device
An all-solid-state battery system is disclosed, the system comprising an all-solid-state battery comprising a plurality of cells arranged in a closed inner space of a pressurization chamber and a pressurizing fluid filled in the closed inner space of the pressurization chamber, a state detector configured to detect state information of the all-solid-state battery, a controller configured to output a control signal configured for controlling a pressure applied to the plurality of cells by the pressurizing fluid in the inner space of the pressurization chamber based on the state information of the all-solid-state battery detected by the state detector, and a pressurizing device configured to control the pressure applied to the plurality of cells by the pressurizing fluid according to the control signal outputted by the controller.
1 . An all-solid-state battery system, comprising:
an all-solid-state battery comprising:
a plurality of cells arranged in a closed inner space of a pressurization chamber; and
a pressurizing fluid filled in the closed inner space of the pressurization chamber;
a state detector configured to detect state information of the all-solid-state battery;
a controller configured to output a first control signal configured for controlling a pressure applied to the plurality of cells by the pressurizing fluid in the closed inner space of the pressurization chamber based on the state information of the all-solid-state battery detected by the state detector; and
a pressurizing device configured to control the pressure applied to the plurality of cells by the pressurizing fluid according to the first control signal outputted by the controller,
wherein:
the state information of the all-solid-state battery comprises cell state information indicating the pressure in the pressurization chamber and whether each cell is charged or discharged,
the controller is configured to output the first control signal based on a number of cells being charged and a number of cells being discharged in the plurality of cells, and
the pressurizing device is configured to control supply and discharge of the pressurizing fluid for the pressurization chamber according to the first control signal outputted by the controller.
2 . The all-solid-state battery system of claim 1 , wherein the all-solid-state battery is an anodeless-type all-solid-state battery, each cell having a structure in which a negative electrode current collector, a solid electrolyte layer, a positive electrode layer, and a positive electrode current collector are stacked.
3 . The all-solid-state battery system of claim 1 , wherein the plurality of cells are:
spaced apart from each other in the closed inner space of the pressurization chamber; and
pressurized by the pressurizing fluid in an isostatic pressure.
4 . The all-solid-state battery system of claim 1 , wherein the state detector comprises:
a pressure sensor configured to detect the pressure in the pressurization chamber; and
a cell state detector configured to detect the cell state information indicating whether each cell is charged or discharged.
5 . The all-solid-state battery system of claim 4 , wherein:
the cell state information comprises a voltage of each cell, and
the cell state detector comprises a voltage detector configured to detect the voltage of each cell.
6 . The all-solid-state battery system of claim 4 , wherein:
the state detector further comprises a temperature sensor configured to detect a temperature in the pressurization chamber, and
the controller is configured to start charging and discharging each cell when the temperature in the pressurization chamber and the pressure in the pressurization chamber are within a predetermined set temperature range and within a predetermined set pressure range, respectively.
7 . The all-solid-state battery system of claim 1 , further comprising a temperature adjusting device configured to control the temperature of the all-solid-state battery according to a second control signal outputted by the controller,
wherein:
the state detector further comprises a temperature sensor configured to detect a temperature in the pressurization chamber, and
the controller is further configured to output the second control signal configured for maintaining the temperature of the all-solid-state battery within a predetermined set temperature range based on the temperature in the pressurization chamber detected by the temperature sensor.
8 . The all-solid-state battery system of claim 7 , wherein the temperature adjusting device comprises:
a heating device installed on an outer surface of the pressurization chamber and configured to raise the temperature of the all-solid-state battery; and
a cooling device operably connected to the pressurization chamber and configured to cool the all-solid-state battery using a cooling water, wherein the cooling device is comprises a cooling water passage provided in the pressurization chamber and a cooling water line.
9 . The all-solid-state battery system of claim 1 , wherein the controller is configured to output the first control signal configured for maintaining the pressure in the pressurization chamber filled with the pressurizing fluid within a predetermined set pressure range.
10 . The all-solid-state battery system of claim 1 , wherein the pressurizing device is configured to control a flow rate of the pressurizing fluid supplied to the pressurization chamber or a flow rate of the pressurizing fluid discharged from the pressurization chamber together with an amount of the pressurizing fluid in the pressurization chamber according to the first control signal outputted by the controller.
11 . The all-solid-state battery system of claim 1 , wherein the pressurizing device comprises:
a fluid storing part configured to store the pressurizing fluid;
a fluid supply device configured to supply the pressurizing fluid stored in the fluid storing part to the closed inner space of the pressurization chamber;
a fluid line configured to connect the fluid supply device, the pressurization chamber, and the fluid storing part; and
a fluid adjusting device installed in the fluid line and configured to control supply and discharge of the pressurizing fluid for the pressurization chamber according to the first control signal outputted by the controller.
12 . The all-solid-state battery system of claim 11 , wherein:
the fluid line comprises:
an inlet side fluid line connecting between the fluid supply device and an inlet port of the pressurization chamber; and
an outlet side fluid line connecting between an outlet port of the pressurization chamber and the fluid storing part, and
the fluid adjusting device comprises:
a first control valve; and
a first regulator installed in the inlet side fluid line configured to control:
an amount of the pressurizing fluid in the pressurization chamber; and
a flow rate of the pressurizing fluid supplied to the pressurization chamber; and
a second control valve and a second regulator installed in the outlet side fluid line configured to control:
the amount of the pressurizing fluid in the pressurization chamber; and
a flow rate of the pressurizing fluid discharged from the pressurization chamber.
13 . The all-solid-state battery system of claim 12 , wherein the fluid adjusting device comprises:
a first flowmeter installed in the inlet side fluid line configured to detect the flow rate of the pressurizing fluid supplied to the pressurization chamber and configured to input a first flow rate detection signal to the controller; and
a second flowmeter installed in the outlet side fluid line configured to detect the flow rate of the pressurizing fluid discharged from the pressurization chamber and configured to input a second flow rate detection signal to the controller.
14 . The all-solid-state battery system of claim 12 , wherein:
the state information of the all-solid-state battery comprises the pressure in the pressurization chamber, and
the controller is configured to output the first control signal configured for maintaining the pressure in the pressurization chamber within a predetermined set pressure range.
15 . The all-solid-state battery system of claim 14 , wherein:
the state information of the all-solid-state battery further comprises cell state information indicating whether each cell is charged and discharged, and
based on the pressure in the pressurization chamber, the number of cells being charged, and the number of cells being discharged in the plurality of cells, the controller is configured to output the first control signal configured for controlling the flow rate of the pressurizing fluid supplied to the pressurization chamber or the flow rate of the pressurizing fluid discharged from the pressurization chamber together with the amount of the pressurizing fluid in the pressurization chamber.
16 . The all-solid-state battery system of claim 15 , wherein:
the controller is configured to determine a value, d, which is a difference between the number of cells being charged and the number of cells being discharged in the plurality of cells,
when the pressure in the pressurization chamber is lower than the set pressure range, the controller is configured to open the first control valve, and
based on flow rate information detected by a first flowmeter installed in the inlet side fluid line, the controller is configured to output the first control signal configured for controlling an operation of the first regulator so that the flow rate of the pressurizing fluid supplied to the pressurization chamber is within a flow rate range determined according to the value, d.
17 . The all-solid-state battery system of claim 15 , wherein:
the controller is configured to determine a value, d, which is a difference between the number of cells being charged and the number of cells being discharged in the plurality of cells,
when the pressure in the pressurization chamber is lower than the set pressure range, the controller is configured to open the second control valve, and
based on flow rate information detected by a second flowmeter installed in the outlet side fluid line, the controller is configured to output the first control signal configured for controlling an operation of the second regulator so that the flow rate of the pressurizing fluid discharged from the pressurization chamber is within a flow rate range determined according to the value, d.
18 . The all-solid-state battery system of claim 1 , wherein the pressurizing fluid comprises at least one of:
a liquid or a gas having an electrical conductivity of at least less than 10-10 S/cm;
a liquid or a gas that maintains a liquid or gaseous state and do not undergo an electrochemical reaction in a temperature range of −20° C. to 70° C.;
a liquid or a gas that does not undergo an electrochemical reaction even at 5V or higher; or
a non-flammable liquid or an inert gas that is electrically non-conductive.