JP2011243941A - Doping bath for fabricating energy storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a doping bath for fabricating an energy storage device that can simultaneously perform free-doping of a plurality of cell laminates with lithium ions.SOLUTION: The doping bath for fabricating an energy storage device of the present invention includes: a doping bath that contains an electrolyte; a lithium foil that is provided in the doping bath; and power supply means that supplies power to the lithium foil and at least one cell laminate provided to be sunk in the electrolyte in the doping bath. The power supply means performs a charging process to supply power between a cathode and an anode of the cell laminate and a discharging process to supply power between the lithium foil and the anode of the cell laminate to dope the cathode of the cell laminate with lithium.

Description

  The present invention relates to a doping tank for manufacturing an energy storage device, and more particularly to a doping tank for manufacturing an energy storage device for simultaneously free-doping lithium ions on the cathodes of a plurality of cell stacks.

  In general, an electrochemical energy storage device is a core component of a complete product device that is essentially used in all portable information communication devices and electronic devices. Also, the electrochemical energy storage device will surely be used as a high quality energy source in the field of new renewable energy that can be applied to future electric vehicles, portable electronic devices and the like.

  Among electrochemical energy storage devices, an electrochemical capacitor may be classified into an electric double layer capacitor using an electric double layer principle (Electrical double layer capacitor) and a hybrid supercapacitor using an electrochemical oxidation-reduction reaction (Hybrid supercapacitor). it can.

  Here, the electric double layer capacitor is often used in a field requiring high output energy characteristics, but the electric double layer capacitor has a problem of a small capacity. Compared to this, much research has been conducted on hybrid supercapacitors as a new alternative to improve the capacitance characteristics of electric double layer capacitors. In particular, among hybrid supercapacitors, a lithium ion capacitor (LIC) can have a storage capacity of about 3 to 4 times that of an electric double layer capacitor.

  Meanwhile, the energy storage device can be manufactured in a winding type and a pouch type, and the pouch type energy storage device has a smaller weight than the winding type and is manufactured at a low cost. Can be done.

  The manufacturing process of the pouch-type energy storage device includes a stacking process in which an anode having a sheet form, a separation membrane, and a cathode are sequentially stacked to form a cell stack, and a welding process in which the anode terminal and the cathode terminal are respectively welded And a sealing step of sealing each cell with aluminum. Here, when the energy storage device is a lithium ion capacitor, a pretreatment doping process for free doping of lithium ions to the cathode has to be performed before the sealing process.

  As described above, the step of free doping lithium ions into the cathode is performed by placing the cell stack in the case and then introducing the electrolyte into the case. Accordingly, since the lithium ion free doping process is performed on each cell stack, it is difficult to apply mass production due to a decrease in productivity.

  Therefore, the present invention has been derived to solve the problems generated in the energy storage device. Specifically, the present invention is an energy capable of simultaneously free-doping lithium ions in a large number of cell stacks. It is an object to provide a doping bath for the production of storage devices.

  It is an object of the present invention to provide a doping bath for manufacturing an energy storage device. The doping tank for manufacturing the energy storage device includes a doping tank containing an electrolytic solution; a lithium foil provided in the doping tank; and at least one provided to be immersed in the electrolytic solution of the lithium foil and the doping tank. Power supply means for supplying power to the cell stack; the power supply means between the charging step for supplying power between the anode and cathode of the cell stack and the lithium foil and the anode of the cell stack A discharge process for supplying power can be performed to dope lithium into the cathode of the cell stack.

  Here, the doping tank may include temperature adjusting means for adjusting the temperature of the electrolytic solution.

  Moreover, after performing the said charge process previously, the said discharge process can be performed, and the said charge process and discharge process can be performed repeatedly.

  Another object of the present invention is to provide a doping tank for manufacturing an energy storage device. The doping tank contains an electrolyte and has a bottom surface and four side surfaces extended from the bottom surface; A lithium foil positioned on at least one side surface; anode connecting means positioned on one side surface of the doping tank; cathode connecting means positioned on the other side surface corresponding to one side surface of the doping tank; and the anode connecting means and cathode Power supply means for supplying power to the connection means and the lithium foil.

  The cell stack may further include at least one cell stack that is accommodated in the doping tank for manufacturing the energy storage device and is immersed in the electrolyte solution. The cell stack includes an anode, a cathode, and a separator. The separator may be interposed therebetween, the anode may be connected to the anode connecting means, and the cathode may be connected to the cathode connecting means.

  The power supply means performs a charging process for supplying power between the anode connecting means and the cathode connecting means, and a discharging process for supplying power between the lithium foil and the anode connecting means, thereby supplying lithium to the cathode. Can be doped.

  Moreover, after performing the said charge process previously, the said discharge process can be performed, and the said charge process and discharge process can be performed repeatedly.

  The anode and the cathode may be physically and electrically connected to the anode connecting means and the cathode connecting means by a fastening member, respectively.

  The fastening member may be a clamp.

  The anode connecting means is fixed to one side surface of the doping tank, and is electrically connected to the power supply means, and extends from the anode body portion to the other side surface with a certain length. The cathode connecting means is fixed to the other side of the doping tank and electrically connected to the power supply means, and the one side from the cathode main body. It may include at least one cathode rod portion that is extended by a certain length.

  The anode body is fixed to the outside of one side surface of the doping tank, the anode rod part is provided through the one side, and the cathode body part is outside the other side of the doping tank. The cathode rod part may be fixed through the other side surface.

  The anode body part and the cathode body part include a conductive material, and are connected to at least one of both side ends of the anode body part, and at least one of both side edges of the cathode body part. The power supply means, the anode rod part and the cathode rod part may be electrically connected via the anode connection terminal and the cathode connection terminal.

  In addition, it may further include a lithium fixing tab positioned at an angle formed by a side surface of the doping tank.

  The lithium fixing tab is physically fastened to the lithium foil to fix the lithium foil, and is electrically connected to the power supply means, and the power supply means and the lithium foil are electrically connected. can do.

  Further, a step portion is formed in a certain region of the lithium fixing tab so as to be spaced apart from a side surface of the doping bath at a predetermined interval, and the lithium foil is formed on the step portion of the lithium fixing tab and the side surface of the doping bath. It can be fixed by being sandwiched between the separation spaces formed between the two.

  In addition, a tab connection terminal connected to the power supply unit may be provided on the lithium fixing tab.

  In addition, it may further include a temperature adjusting means for adjusting the temperature of the electrolytic solution.

  The temperature adjusting unit may be a heater, and the heater may be provided on the bottom surface of the doping tank.

  The doping tank may include an electrolyte drain for discharging the electrolyte from the doping tank.

  The electrolyte drain port may be provided on a side surface of the doping tank and may be provided at a position adjacent to the bottom surface of the doping tank.

  In addition, the bottom surface of the doping tank may be inclined as a whole, and may be inclined such that the bottom surface side in contact with the side surface provided with the electrolyte drain port is at a lower position.

  The lithium foil may be located below the anode connecting means and the cathode connecting means.

  The lithium foil may be immersed in the electrolytic solution.

  In the doping tank for manufacturing the energy storage device of the present invention, a large number of energy storage devices can be doped with lithium ions, and mass productivity can be improved.

  In addition, the doping tank for manufacturing the energy storage device of the present invention can increase the temperature of the electrolytic solution and increase the doping efficiency of lithium ions.

  In addition, the doping tank for manufacturing the energy storage device of the present invention performs the doping process by applying a current from the outside instead of an electrical short circuit, so that the doping time of lithium ions can be dramatically reduced.

1 is a conceptual diagram illustrating a concept of a doping tank for manufacturing an energy storage device according to a first embodiment of the present invention. FIG. 3 is a plan view illustrating a specific form of a doping tank for manufacturing an energy storage device according to the first embodiment of the present invention. FIG. 3 is a perspective view of the doping tank illustrated in FIG. 2. It is a side view of the doping tank of FIG. It is side surface sectional drawing of the corner | angular part of FIG. FIG. 4 is an exploded perspective view of the cell stack illustrated in FIG. 3.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, and may be embodied in other forms. Rather, the embodiments described below are provided so that the disclosed content will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity and the same reference numerals throughout the specification indicate the same components.

  FIG. 1 is a conceptual diagram illustrating a concept of a doping tank for manufacturing an energy storage device according to a first embodiment of the present invention.

  Referring to FIG. 1, a doping bath 1000 for manufacturing an energy storage device according to the first embodiment of the present invention may include a doping bath 1100, a lithium foil 1200, a power supply unit 1300 and a temperature control unit 1400.

The doping tank 1000 for manufacturing the energy storage device may be a device for free doping lithium ions into the cell stack 1500.
The doping tank 1100 may be a tank for storing the electrolyte solution 1110 and may be provided in an open shape at the upper end. The electrolyte solution 1110 serves to move lithium ions ionized from the lithium foil 1200.

  The lithium foil 1200 may be provided in the doping tank 1100. The lithium foil 1200 may be fixedly provided on a side surface of the doping tank 1100 and may be provided so as to be immersed in the electrolyte 1110 in the doping tank 1100.

  The power supply unit 1300 may supply power to the lithium foil 1200 and the cell stack 1500 to dope lithium ions into the cathode 1520 of the cell stack 1500. The power supply unit 1300 may include a first power supply unit 1310 for charging the cell stack 1500 and a second power supply unit 1320 for doping the cathode 1520 of the cell stack 1500 with lithium ions. In this case, the first power source unit 1310 may include a first power source 1312 and a first on / off switch 1314, and the second power source unit 1320 may include a second power source 1322 and a second on / off switch 1324.

  The temperature adjusting unit 1400 functions to adjust the temperature of the electrolyte 1110 accommodated in the doping tank 1100. The temperature adjusting unit 1400 serves to adjust the temperature of the electrolyte 1110 so that the cathode 1520 of the cell stack 1500 is efficiently doped with lithium ions.

  The cell stack 1500 can include an anode 1510, a cathode 1520, and a separator 1530. The separator 1530 may be interposed between the anode 1510 and the cathode 1520 to electrically separate the anode 1510 and the cathode 1520.

  The cell stack 1500 may be provided in a form in which an anode 1510, a cathode 1520, and a separator 1530 are sequentially laminated, or may be provided in a form in which an anode 1510, a cathode 1520, and a separator 1530 are wound.

  A method of doping lithium ions into the cell stack 1500 using the doping tank 1000 for manufacturing the energy storage device will be described. First, at least one cell stack 1500 in a state where the electrolyte 1110 is accommodated in the doping tank 1100. Is soaked in the electrolyte 1110.

  Next, the power supply unit 1300 is connected to the lithium foil 1200 and the cell stack 1500. At this time, the anode end of the first power supply 1312 of the first power supply means 1310 of the power supply means 1300 is connected to the anode 1510 of the cell stack 1500, and the cathode end of the first power supply 1312 of the first power supply means 1310 is the cell stack. Connected to 1500 cathodes 1520. The anode end of the second power supply 1322 of the second power supply means 1320 of the power supply means 1300 is connected to the lithium foil 1200, and the cathode end of the second power supply 1322 of the second power supply means 1320 is connected to the anode 1510 of the cell stack 1500. To do. At this time, the first power supply means 1310 may be provided with a first on / off switch 1314 for turning on / off the first power supply means 1310, and the second power supply means 1320 may be provided with a second power supply means 1320 for turning on / off. A two on / off switch 1324 may be provided.

  Next, a charging process is performed in which the first on / off switch 1314 is changed to an on state to charge between the anode 1510 and the cathode 1520 of the cell stack 1500. When the cell stack 1500 is fully charged, the first on / off switch 1314 is changed to the off state, the second on / off switch 1324 is changed to the on state, and the anode 1510 and the lithium foil 1200 are discharged to form the cathode. A doping process is performed so that 1520 is doped with lithium ions.

  In the present embodiment, for convenience of explanation, the power supply means 1300 includes a first power supply means 1310 and a second power supply means 1320, respectively, and the first power supply means 1310 and the second power supply means 1320 control the charging process and the discharging process, respectively. However, the power supply means 1300 can be changed to be configured by one circuit having the function of the first power supply means 1310 and the function of the second power supply means 1320 at the same time.

  At this time, the discharging process is performed after the charging process is performed first, and the charging process and the discharging process are repeated so that the cathode 1520 is sufficiently doped with lithium ions.

  FIG. 2 is a plan view illustrating a specific embodiment of a doping tank for manufacturing an energy storage device according to the first embodiment of the present invention, and FIG. 3 is a perspective view of the doping tank illustrated in FIG. 4 is a side view of the doping tank of FIG. 3, FIG. 5 is a side cross-sectional view of the corner of FIG. 3, and FIG. 6 is an exploded perspective view of the cell stack shown in FIG.

  The doping tank 2000 for manufacturing the energy storage device will be described with reference to FIGS. 2 to 6. The doping tank 2000 for manufacturing the energy storage device includes the doping tank 2100, the lithium foil 2200, the anode connection means 2300, the cathode connection means 2400, and the like. A power supply unit 2500 may be included. The doping tank 2000 for manufacturing the energy storage device may be a device for doping the cell stack 2600 with lithium ions. The doping tank 2000 for manufacturing the energy storage device may further include a temperature control unit 2700.

  The doping tank 2100 may include a bottom surface 2110 and four side surfaces 2120, 2130, 2140, and 2150 extended from the bottom surface 2110, and an electrolyte solution in a receiving space including the bottom surface 2110 and the four side surfaces 2120, 2130, 2140, and 2150. (Not shown) can be accommodated.

  An electrolyte drain port 2160 may be provided on any one of the four side surfaces 2120, 2130, 2140, and 2150 of the doping tank 2100. The electrolyte drain port 2160 is provided for discharging the electrolyte from the doping tank 2100.

  The electrolyte outlet port 2160 is preferably provided at a position adjacent to the bottom surface 2110 for easy discharge of the electrolyte solution.

  Meanwhile, the bottom surface 2110 of the doping bath 2100 may be provided to be inclined as shown in FIG. Preferably, the bottom surface 2110 has a side surface provided with an electrolyte solution drain port 2160 on the bottom surface side in contact with a side surface provided with an electrolyte solution drain port 2160 (in FIG. 3 and FIG. 4, the electrolyte solution drain port is a side surface indicated by reference numeral 2150). It can be provided so as to be inclined so that it is at a lower position than the bottom surface side in contact with the side surface opposite to the side surface (the side surface shown in FIG.

  This is to prevent the electrolyte from remaining on the bottom surface 2110 of the doping tank 2100 when the electrolyte is discharged. That is, the bottom surface 2110 is provided to be inclined so that the electrolyte is completely discharged from the doping tank 2100 through the electrolyte drain port 2160.

  The lithium foil 2200 may be provided on at least one of the side surfaces 2120, 2130, 2140, and 2150 in the doping bath 2100. The lithium foil 2200 may be provided so as to be immersed in an electrolyte contained in the doping tank 2100 and may be positioned below the anode connection means 2300 and the cathode connection means 2400 described later.

  The lithium foil 2200 can be fixed by a lithium fixing tab 2210.

  The lithium fixing tab 2210 may be positioned at any one of four corners formed by the side surfaces 2120, 2130, 2140, and 2150 of the doping bath 2100.

  The lithium fixing tab 2210 is physically fastened to the lithium foil 2200 to fix the lithium foil 2200 and is electrically connected to the power supply unit 2500, and electrically connects the power supply unit 2500 and the lithium foil 2200. Can do.

  A certain region of the lithium fixing tab 2210 is provided with a step portion 2212 on its horizontal cross section as shown in FIG. The step portion 2212 is spaced apart from the side surfaces 2120, 2130, 2140, and 2150 at a constant interval, and a separation space 2214 is formed between the step portion 2212 and one of the side surfaces 2120, 2130, 2140, and 2150. To do.

  As illustrated in FIG. 5, the lithium foil 2200 is sandwiched in the separation space 2214 so that the lithium foil 2200 is fixed. Further, when the lithium foil 2200 is sandwiched between the separation spaces 2214, the lithium foil 2200 and the lithium fixing tab 2210 serve to be electrically connected.

  On the other hand, the lithium fixing tab 2210 is provided with a tab connection terminal 2216 that extends from the top and is electrically connected to the power supply unit 2500 on the side surfaces 2120, 2130, 2140, and 2150.

  The tab connecting terminal 2216 is preferably provided at the upper end of the side surfaces 2120, 2130, 2140, and 2150 and at a high position so as not to be immersed in the electrolytic solution.

  In the embodiment of the present invention, the lithium foil 2200 has been described as being connected to the tab connection terminal 2216 using the lithium fixing tab 2210, but the embodiment is not limited thereto. For example, the lithium foil 2200 and the tab connection terminal 2216 can be electrically connected to each other using a clamp.

  The anode connecting means 2300 can be located on one side of the doping bath 2100, and the cathode connecting means 2400 can be located on the other side corresponding to one side where the anode connecting means 2300 is located. In FIG. 3, one side is indicated by a side indicated by a reference numeral 2120, and the other side is indicated by a side indicated by a reference numeral 2130. For the convenience of the following description, one side will be described with the side indicated by reference numeral 2120, and the other side will be described with the side indicated by reference numeral 2130.

  The anode connection unit 2300 may be fixed to the upper end of the side surface 2120. The anode connecting means 2300 may include an anode body part 2320 and an anode rod part 2340. The anode connection means 2300 may include an anode connection terminal 2360.

  The anode body 2320 can serve to fix the anode connecting means 2300 to one side 2120 of the doping tank 2100. The anode body portion 2320 can be fixed to the outside of the one side surface 2120. Further, the anode main body portion 2320 serves to physically fix the anode rod portion 2340. In addition, when the anode connection terminal 2360 is provided, the anode main body portion 2320 includes a conductive material and serves to electrically connect the anode rod portion 2340 and the anode connection terminal 2360. At this time, when the anode connection unit 2300 and the power supply unit 2500 are electrically connected, the power supply unit 2500 can be directly connected to the anode rod portion 2340 and includes the anode connection terminal 2360. The anode rod part 2340 may be connected to the anode connecting part 2360.

  In the embodiment of the present invention, it is assumed that the anode connection terminal 2360 is provided, and this will be mainly described.

  The anode rod part 2340 may be extended from the anode main body part 2320 and may be extended with a certain length toward the other side 2130 of the doping bath 2100. The anode rod portion 2340 may be extended through the one side surface 2120 when the anode main body portion 2320 is fixed to the outside of the one side surface 2120. At least one or a plurality of anode rod parts 2340 may be arranged at regular intervals.

  The cathode connection unit 2400 may be fixed to the upper end of the other side surface 2130. The cathode connection unit 2400 may include a cathode body 2420 and a cathode rod 2440. The cathode connection unit 2400 may include a cathode connection terminal 2460.

  The cathode body 2420 serves to fix the cathode connecting means 2400 to the other side 2130 of the doping tank 2100. The cathode main body 2420 can be fixed to the outside of the other side surface 2130. The cathode body 2424 serves to physically fix the cathode rod 2440. When the cathode connection terminal 2460 is provided, the cathode body 2420 includes a conductive material and serves to electrically connect the cathode rod part 2440 and the cathode connection terminal 2460. At this time, when the cathode connection unit 2400 and the power supply unit 2500 are electrically connected, the power supply unit 2500 may be directly connected to the cathode rod portion 2440. Alternatively, when the cathode connecting terminal 2460 is provided, the cathode connecting terminal 2460 can be connected to the cathode rod portion 2440.

  In the embodiment of the present invention, it is assumed that the cathode connecting terminal 2460 is provided, and this will be mainly described.

  The cathode rod part 2440 may be extended from the cathode body part 2420 and may be extended with a certain length toward one side 2120 of the doping tank 2100. The cathode rod portion 2440 may extend through the other side surface 2130 when the cathode main body portion 2420 is fixed to the outside of the other side surface 2130. At least one or a plurality of cathode rod portions 2440 may be arranged at regular intervals.

  The power supply unit 2500 may supply power to the lithium foil 2200 and the cell stack 2600 to dope lithium ions into the cathode 2620 of the cell stack 2600. The power supply unit 2500 may include a first power supply unit 2510 for charging the cell stack 2600 and a second power supply unit 2520 for doping the cathode 2620 of the cell stack 2600 with lithium ions. In this case, the first power source unit 2510 may include a first power source 2512 and a first on / off switch 2514, and the second power source unit 2520 may include a second power source 2522 and a second on / off switch 2524.

  The power supply unit 2500 may be connected to the lithium foil 2200, the anode connection unit 2300, and the cathode connection unit 2400. At this time, the anode end of the first power supply 2512 of the first power supply means 2510 of the power supply means 2500 is connected to the anode connection means 2300, and the cathode end of the first power supply 2512 of the first power supply means 2510 is connected to the cathode connection means 2400. Can be done. The anode end of the second power supply 2522 of the second power supply means 2520 of the power supply means 2500 is connected to the lithium fixing tab 2210, preferably the lithium connection terminal 2216, and the cathode end of the second power supply 2522 of the second power supply means 2520 is the anode. Connected to connecting means 2300.

  The doping tank 2000 for manufacturing the energy storage device is a device for free-doping lithium ions on the cathode 2620 of the cell stack 2600. At this time, the cell stack 2600 may include an anode 2610, a cathode 2620, and a separator 2630. The separator 2630 may be interposed between the anode 2610 and the cathode 2620 to electrically separate the anode 2610 and the cathode 2620. The cell stack 2600 may be provided in a form in which an anode 2610, a cathode 2620, and a separator 2630 are sequentially laminated, or may be provided in a form in which an anode 2610, a cathode 2620, and a separator 2630 are wound. On the other hand, the anode 2610 includes an anode tab 2612 that can connect the anode 2610 to an external device, and the cathode 2620 can also include a cathode tab 2622.

  The cell stack 2600 can be doped with lithium ions in a state where the cell stack 2600 is immersed in an electrolyte in the doping tank 2100 of the doping tank 2000 for manufacturing the energy storage device, preferably in the doping tank 2100. At this time, the anode tab 2612 of the anode 2610 and the cathode tab 2622 of the cathode 2620 are physically connected to the anode connection means 2300 and the cathode connection means 2400, preferably the anode rod portion 2340 and the cathode rod portion 2440 by the fastening member 2640, respectively. And electrically connected. At this time, the fastening member 2640 may be a clamp that fastens the anode tab 2612 and the anode rod portion 2340, and may be a clamp that fastens the cathode tab 2622 and the cathode rod portion 2440.

  The temperature adjusting unit 2700 serves to adjust the temperature of the electrolyte solution stored in the doping tank 2100. The temperature adjusting unit 2700 serves to adjust the temperature of the electrolyte so that the cathode 2620 of the cell stack 2600 is efficiently doped with lithium ions. The temperature control unit 2700 is provided on the bottom surface 2110 of the doping chamber 2100 and extends from the bottom surface 2110 to any one of the four side surfaces 2120, 2130, 2140, and 2150 of the doping chamber 2100 and is connected to the outside. be able to. In FIG. 2, the temperature adjusting means 2700 is illustrated as being extended to the side indicated by the reference numeral 2150, but it may be extended to any side. Although not shown in the drawings, any one of the four side surfaces 2120, 2130, 2140, and 2150 may be extended to the outside. Meanwhile, the temperature adjusting unit 2700 may be a heating device that heats the electrolytic solution, and may be, for example, a heater.

  The method of doping the cell stack 2600 with lithium ions using the doping tank 2000 for manufacturing the energy storage device will be described. First, at least one cell stack 2600 is added to the electrolyte in the doping tank 2000 for manufacturing the energy storage device. Put it in the soak.

  At this time, the anode tab 2612 of the cell stack 2600 is fastened to the anode rod portion 2340 by the fastening member 2640, and the cathode tab 2622 is fastened to the cathode rod portion 2440 by the fastening member 2640.

  Next, a charging process is performed in which the first on / off switch 2514 is changed to an on state to charge between the anode 2610 and the cathode 2620 of the cell stack 2600. When charging of the cell stack 2600 is completed, the first on / off switch 2514 is changed to the off state, the second on / off switch 2524 is changed to the on state, and the anode 2610 and the lithium foil 2200 are discharged to form the cathode. A doping process is performed so that lithium ions are doped into 2620.

  At this time, the discharging process is performed after the charging process is performed first, and the charging process and the discharging process are repeated so that the cathode 2620 is sufficiently doped with lithium ions.

  Here, when the lithium ion doping process is completed for the cathode 2620, the energy storage device can be manufactured by performing the sealing process after the cell stack is taken out of the doping tank.

  In the present embodiment, for convenience of explanation, the power supply unit 2500 includes a first power unit 2510 and a second power unit 2520, respectively, and the first power unit 2510 and the second power unit 2520 control the charging process and the discharging process, respectively. However, the power supply unit 2500 can be changed to be configured by one circuit having the function of the first power supply unit 2510 and the function of the second power supply unit 2520 at the same time.

  Therefore, using the doping tank for manufacturing the energy storage device of the present invention, the cell stack was immersed in a doping tank in which the electrolytic solution was stored, and then the charging process and the discharging process were repeated to dope lithium ions. Thereafter, a plurality of energy storage devices can be easily manufactured by performing a process of sealing the energy storage devices.

  In addition, the doping tank for manufacturing the energy storage device of the present invention can increase the doping efficiency by adjusting the temperature of the electrolyte, and can significantly reduce the doping time of lithium ions.

  As described above, the present invention has been described with reference to the embodiment, but the present invention is not limited to this. It will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention, and that such modifications and changes also belong to the invention.

2000 Doping tank for manufacturing energy storage device 2100 Doping tank 2200 Lithium foil 2300 Anode connecting means 2400 Cathode connecting means 2500 Power supply means 2600 Cell stack 2700 Temperature adjusting means

Claims (23)

A doping bath containing an electrolyte;
A lithium foil provided in the doping tank; and a power supply means for supplying power to at least one cell stack provided to be immersed in the electrolyte solution of the lithium foil and the doping tank;
The power supply means performs a charging process for supplying power between the anode and cathode of the cell stack and a discharging process for supplying power between the lithium foil and the anode of the cell stack, so that the cathode of the cell stack A doping tank for manufacturing an energy storage device, in which lithium is doped.   The doping tank for manufacturing an energy storage device according to claim 1, wherein the doping tank includes temperature adjusting means for adjusting the temperature of the electrolyte.   The doping tank for manufacturing an energy storage device according to claim 1 or 2, wherein the discharging step is performed after the charging step is performed first, and the charging step and the discharging step are repeated. A doping bath containing an electrolyte and having a bottom surface and four side surfaces extended from the bottom surface;
A lithium foil located on at least one of the four sides in the doping bath;
Anode connecting means located on one side of the doping tank;
Cathode connection means located on the other side corresponding to one side of the doping tank; and power supply means for supplying power to the anode connection means, cathode connection means and lithium foil;
A doping tank for manufacturing an energy storage device. And further comprising at least one cell laminate housed in the doping tank for manufacturing the energy storage device and immersed in the electrolyte solution,
The cell laminate includes an anode, a cathode, and a separator, and the separator is interposed between the anode and the cathode,
The doping tank for manufacturing an energy storage device according to claim 4, wherein the anode is connected to the anode connecting means, and the cathode is connected to the cathode connecting means.   The power supply means performs a charging process for supplying power between the anode connecting means and the cathode connecting means and a discharging process for supplying power between the lithium foil and the anode connecting means to dope lithium into the cathode. The doping tank for manufacturing an energy storage device according to claim 5.   The doping tank for manufacturing an energy storage device according to claim 6, wherein the discharging step is performed after the charging step is performed first, and the charging step and the discharging step are repeated.   6. The doping tank for manufacturing an energy storage device according to claim 5, wherein the anode and the cathode are physically and electrically connected to the anode connecting means and the cathode connecting means by fastening members, respectively.   The doping tank for manufacturing an energy storage device according to claim 8, wherein the fastening member is a clamp. The anode connecting means is fixed to one side surface of the doping tank, and is at least extended from the anode body portion to the other side surface by a certain length and is electrically connected to the power supply means. Including one anode rod part,
The cathode connecting means is fixed to the other side surface of the doping tank, and is extended by a certain length from the cathode body portion to the one side surface and the cathode body portion electrically connected to the power supply means. The doping tank for manufacturing an energy storage device according to any one of claims 4 to 9, comprising at least one cathode rod portion. The anode body is fixed to the outside of one side of the doping tank, and the anode rod is provided through the one side.
The doping tank for manufacturing an energy storage device according to claim 10, wherein the cathode main body is fixed to the outside of the other side surface of the doping tank, and the cathode rod part is provided through the other side surface. The anode body part and the cathode body part include a conductive material,
An anode connecting terminal connected to at least one of both side ends of the anode body, and
A cathode connection terminal connected to at least one of both side ends of the cathode body portion;
The doping tank for manufacturing an energy storage device according to claim 10, wherein the power supply means, the anode rod part and the cathode rod part are electrically connected through the anode connection terminal and the cathode connection terminal.   The doping tank for manufacturing an energy storage device according to any one of claims 4 to 12, further comprising a lithium fixing tab positioned at any one of four corners formed by four side surfaces of the doping tank. .   The lithium fixing tab is physically fastened to the lithium foil to fix the lithium foil, is electrically connected to the power supply means, and electrically connects the power supply means and the lithium foil. Item 14. A doping tank for producing the energy storage device according to Item 13. A stepped portion is formed in a certain region of the lithium fixing tab so as to be spaced apart from a side surface of the doping bath at a certain interval,
The doping tank for manufacturing an energy storage device according to claim 14, wherein the lithium foil is fixed by being sandwiched between a space formed between a step portion of the lithium fixing tab and a side surface of the doping tank.   The doping tank for manufacturing an energy storage device according to claim 14, further comprising a tab connection terminal connected to the power supply unit on an upper part of the lithium fixing tab.   The doping tank for manufacturing an energy storage device according to any one of claims 4 to 16, further comprising a temperature adjusting means for adjusting a temperature of the electrolytic solution.   The doping tank for manufacturing an energy storage device according to claim 17, wherein the temperature adjusting means is a heater, and the heater is provided on a bottom surface of the doping tank.   The doping tank for manufacturing an energy storage device according to any one of claims 4 to 18, wherein the doping tank includes an electrolytic solution drain for discharging the electrolytic solution from the doping tank.   The doping tank for manufacturing an energy storage device according to claim 19, wherein the electrolyte drain port is provided on a side surface of the doping tank and is provided at a position adjacent to a bottom surface of the doping tank.   21. The doping for manufacturing an energy storage device according to claim 20, wherein a bottom surface of the doping tank is inclined as a whole, and a bottom surface side in contact with a side surface provided with the electrolyte drain port is inclined at a lower position. Tank.   The doping tank for manufacturing an energy storage device according to any one of claims 4 to 21, wherein the lithium foil is located below the anode connection means and the cathode connection means.   The doping tank for manufacturing an energy storage device according to claim 22, wherein the lithium foil is immersed in the electrolytic solution.

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