Electrolyte injection and impregnation device and method therefor

Abstract

The present invention provides an electrolyte injection and impregnation device (10) comprising: a seating part (100) on which a plurality of battery cells (50) are seated; a plurality of hoppers (200) respectively connected to the plurality of battery cells (50) seated on the seating part (100); an electrolyte supplier (300) connected to the plurality of hoppers (200); and a pressure reducing source (P1) and a pressure increasing source (P2) which are connected to the plurality of hoppers (200). Through the plurality of hoppers (200), an electrolyte is injected into the plurality of battery cells (50), and the inside of the plurality of battery cells (50) can be reduced to a pressure lower than atmospheric pressure and increased to a pressure greater than atmospheric pressure.

Description

Electrolyte injection and impregnation device and method thereof

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0005502, dated January 12, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an electrolyte injection and impregnation device and an electrolyte injection and impregnation method, wherein the electrolyte injection device and the impregnation device are integrated into a single device, the maintenance cost of a secondary battery manufacturing device is reduced, the manufacturing cost of a secondary battery is reduced, the manufacturing time is shortened, abnormal operation or defects can be quickly and easily confirmed with the naked eye, and the amount of electrolyte leakage is reduced.

[0003] Typically, the electrolyte injection process of a secondary battery is performed in the order of vacuum, injection, and ventilation in the injection chamber and electrolyte injection device (6, Fig. 1). In addition, the electrolyte impregnation process of the battery is performed by alternately repeating vacuum and pressurization in the impregnation chamber (71, Fig. 3).

[0004] In this way, since both an electrolyte injection device and an impregnation device are required to manufacture a battery, the maintenance cost of the secondary battery manufacturing device and the manufacturing cost of the secondary battery increase, the time required to manufacture the secondary battery increases, the equipment space increases, the chamber is large, it is difficult to identify the cause of the device's defect, and maintenance is difficult. In addition, since the pressure inside the impregnation chamber must be repeatedly increased and decreased to impregnate the electrolyte of each battery cell (50) inside the impregnation chamber, the amount of high-purity gas (e.g., inert gas, nitrogen) used during pressurization increases, which increases the manufacturing cost of the secondary battery. In addition, since the electrolyte impregnation work is performed while each battery cell (50) is accommodated inside the chamber, it is not possible to quickly and easily check with the naked eye if the impregnation is not performed normally or a defect occurs in the electrolyte impregnation device.

[0005] In addition, conventionally, a hopper (62) of an upper carrier (61a) connecting the battery cell (50) and the injector (63) of the electrolyte injection device (6) is interposed between them (Fig. 1, Fig. 2). Therefore, conventionally, there was no sealing between the hopper (62) of the upper carrier (61a) and the injector (63), resulting in a large amount of electrolyte leakage. Here, the carrier (61) may be a case or pallet used to easily transport and fix a plurality of battery cells (50). Therefore, since the electrolyte must be washed frequently, the secondary battery production volume decreases, and secondary problems (e.g., weakening of the sealing force between the battery cell (50) and the hopper (61)) occur due to the electrolyte leakage.

[0006] Therefore, a method that can solve the above-mentioned problems at once is required.

[0007] Prior art related to this is Korean Patent No. 10-2399085.

[0008] The present invention has been devised to solve the above-described problems, and its purpose is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that integrate a conventional electrolyte injection device and an impregnation device into a single device, thereby reducing the maintenance cost of a secondary battery manufacturing device.

[0009] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that reduce the manufacturing cost of a secondary battery and shorten the manufacturing time.

[0010] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that can be quickly and easily visually confirmed in the event of abnormal operation or defects.

[0011] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that reduce the electrolyte leakage area (connection area) and the electrolyte leakage amount.

[0012] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that can easily implement a hopper capable of electrolyte injection and pressure increase and decrease with a simple configuration at low cost.

[0013] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that improve the uniformity of pressure increase and decrease of a plurality of hoppers and battery cells and prevent damage.

[0014] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that can prevent damage to a battery cell and stably perform an impregnation process.

[0015] The purpose of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that facilitate alignment and fixation of a battery cell mounting portion and enable the battery cell to be brought into close contact with a hopper.

[0016]

[0017] The technical objectives of the present invention are not limited to the purposes mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0018] In order to solve the above-described problem, the present invention provides an electrolyte injection and impregnation device (10) including a settling portion (100); a plurality of hoppers (200); a decompression source (P1) and a pressure boosting source (P2); a receiving space (400); and a plurality of manifolds (500).

[0019] A plurality of battery cells (50) can be mounted on the above mounting portion (100).

[0020] The above plurality of hoppers (200) can be connected to the above plurality of battery cells (50) mounted on the mounting portion (100), respectively.

[0021] The above electrolyte supply device (300) can be connected to the plurality of hoppers (200).

[0022] The above pressure reducing source (P1) and the pressure increasing source (P2) can be connected to the plurality of hoppers (200).

[0023] The above-mentioned receiving space (400) can be connected to the above-mentioned decompression source (P1) and the above-mentioned decompression source (P2).

[0024] Through the plurality of hoppers (200), electrolyte can be injected into the plurality of battery cells (50).

[0025] Through the above plurality of hoppers (200), the interior of the plurality of battery cells (50) can be depressurized to a pressure lower than atmospheric pressure.

[0026] Through the above plurality of hoppers (200), the interior of the plurality of battery cells (50) can be pressurized to a pressure greater than atmospheric pressure.

[0027] Each of the above hoppers (200) may include a liquid injection unit (210) and a pressure increasing unit (220).

[0028] The above-mentioned liquid supply unit (210) can supply the electrolyte introduced from the outside into the battery cell (50).

[0029] The above-mentioned liquid portion (210) may be openable.

[0030] The above pressure increasing / decreasing unit (220) can be connected to the pressure reducing source (P1) and the pressure increasing source (P2).

[0031] The above pressure increasing / decreasing unit (220) can increase or decrease the pressure inside the battery cell (50).

[0032] Each of the above manifolds (500) can connect the pressure increasing / decreasing unit (220) of the receiving space (400) and a plurality of different hoppers (200).

[0033] In one embodiment, each of the hoppers (200) can be in direct contact with each of the battery cells (50).

[0034] In one embodiment, the pressure increasing / decreasing unit (220) may be placed between the tip of the injection unit (210) and the battery cell (50).

[0035] The electrolyte flowing out from the above-mentioned main part (210) can flow into the battery cell (50) through the pressure increasing part (220).

[0036] In one embodiment, the injection unit (210) may include an electrolyte storage unit (212) and an injection needle (214).

[0037] Electrolyte introduced from outside can be stored in the electrolyte storage unit (212).

[0038] The above-mentioned injection needle (214) can open and close the injection unit (210) by opening and closing the electrolyte storage unit (212).

[0039] In one embodiment, when the main needle (214) opens the electrolyte storage unit (212), the electrolyte stored in the electrolyte storage unit (212) can flow into the battery cell (50).

[0040] When the pressure increasing / decreasing unit (220) increases the pressure inside the battery cell (50), the main needle (214) may not open the electrolyte storage unit (212).

[0041] In one embodiment, each of the manifolds (500) may include a common pipe (510) and a plurality of branch pipes (520).

[0042] The above common pipe (510) can be connected to the above receiving space (400).

[0043] The above plurality of branch pipes (520) can each connect the common pipe (510) and the pressure increasing / decreasing section (220) of the different plurality of hoppers (200).

[0044] In one embodiment, each of the branch pipes (520) may have one end connected to the common pipe (510) positioned higher than the other end connected to the pressure increasing / decreasing unit (220) of each of the hoppers (200).

[0045] In one embodiment, the first angle (L) formed by the straight line connecting the one end and the other end of each branch pipe (520) with the horizontal plane may be 30 degrees or more and 60 degrees or less.

[0046] In one embodiment, each of the hoppers (200) may be connected to the upper end of each of the battery cells (50) mounted on the mounting portion (100).

[0047] The above-mentioned mounting portion (100) may include a plurality of cell supports (110).

[0048] The plurality of battery cells (50) can be respectively mounted on the plurality of cell supports (110).

[0049] The above plurality of cell supports (110) can each surround a plurality of battery cells (50).

[0050] Each of the above cell supports (110) can wrap from the lower side to the upper side of each of the above battery cells (50) mounted on each of the above cell supports (110).

[0051] In one embodiment, each of the cell supports (110) may include one or more first grooves (112).

[0052] The above one or more first grooves (112) can be formed by recessing downward from the top of the cell support (110).

[0053] The above one or more first grooves (112) can penetrate the inside and outside of each cell support body (110).

[0054] In one embodiment, each of the hoppers (200) may be positioned above each of the battery cells (50) mounted on the mounting portion (100).

[0055] Each of the above hoppers (200) can be vertically connected to each of the above battery cells (50).

[0056] The above electrolyte injection and impregnation device (10) may further include a base portion (600).

[0057] The above base portion (600) may be located lower than the plurality of hoppers (200).

[0058] The above base portion (600) can be moved up and down relative to the plurality of hoppers (200).

[0059] The above base portion (600) may include a base (610) and a plurality of alignment members (620).

[0060] The above base (610) may be plate-shaped.

[0061] The above plurality of alignment members (620) can be installed on the base (610).

[0062] The above plurality of alignment members (620) may be formed to protrude upward from the base (610).

[0063] Each of the alignment members (620) may include an alignment guide member (622) and an alignment fixing member (624).

[0064] The cross-sectional area of ​​the above alignment guide portion (622) may gradually increase from the top to the bottom.

[0065] The above alignment fixing part (624) can be formed to extend downward from the lower end of the alignment guide part (622).

[0066] The above alignment fixing member (624) may have the same cross-sectional area up and down.

[0067] The above-mentioned mounting portion (100) may include a plurality of alignment holes (120).

[0068] The above plurality of alignment holes (120) can be formed to penetrate vertically.

[0069] The plurality of alignment members (620) can be inserted into or penetrated through the plurality of alignment holes (120).

[0070] At least a portion of each of the above alignment holes (120) may have a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the above alignment fixing members (624).

[0071] At least a portion of the inner surface of each of the above alignment holes (120) can be in contact with each of the above alignment fixing parts (624).

[0072] In one embodiment, the base portion (600) may include a plurality of elastic members (630).

[0073] The above plurality of elastic members (630) can be respectively combined with the above plurality of alignment members (620).

[0074] Each of the above elastic members (630) can be elastically deformed by the above fixing member (100).

[0075] Each of the above elastic members (630) can press the above fixing portion (100) upward.

[0076] To solve the above-described problem, the present invention provides an electrolyte injection and impregnation method (S700) including a settling process (S710); a connecting process (S720); a liquid injection process (S740); and an impregnation process (S750).

[0077] In the above-mentioned settling process (S710), the plurality of battery cells (50) can be settling on the settling portion (100).

[0078] In the above connection process (S720), the plurality of battery cells (50) can be connected to the plurality of hoppers (200), respectively.

[0079] In the above-mentioned injection process (S740), the electrolyte can be injected into the plurality of battery cells (50) through the plurality of hoppers (200).

[0080] In the above impregnation process (S750), the inside of the plurality of battery cells (50) can be depressurized and increased through the plurality of hoppers (200).

[0081] In one embodiment, the electrolyte injection and impregnation method (S700) may include a depressurization process (S730).

[0082] In the above depressurization process (S730), the inside of the plurality of battery cells (50) can be depressurized through the plurality of hoppers (200).

[0083] The above-mentioned injection process (S740) can be performed after the above-mentioned depressurization process (S730).

[0084] According to embodiments of the present invention, an electrolyte injection and impregnation device (10) may include a mounting portion (100) on which a plurality of battery cells (50) are mounted; a plurality of hoppers (200) each connected to the plurality of battery cells (50) mounted on the mounting portion (100); an electrolyte supply (300) connected to the plurality of hoppers (200); a decompression source (P1) and a pressure boost source (P2) connected to the plurality of hoppers (200); a receiving space (400) connected to the decompression source (P1) and the pressure boost source (P2); and a plurality of manifolds (500). Through the plurality of hoppers (200), an electrolyte may be injected into the plurality of battery cells (50), and the interior of the plurality of battery cells (50) may be depressurized to a pressure lower than atmospheric pressure and increased to a pressure higher than atmospheric pressure. Each of the above hoppers (200) may include an openable injection unit (210) for introducing the electrolyte introduced from the outside into the battery cell (50), and a pressure increasing unit (220) connected to the pressure reducing source (P1) and the pressure increasing source (P2) for increasing or decreasing the pressure inside the battery cell (50). Each of the above manifolds (500) may connect the pressure increasing unit (220) of a plurality of different hoppers (200) to the receiving space (400).

[0085] Accordingly, the electrolyte can be injected and impregnated by simply connecting each hopper (200) of the electrolyte injection and impregnation device (10) to each battery cell (50) once. This reduces the manufacturing cost of the secondary battery and shortens the manufacturing time. In addition, since the conventional electrolyte injection device and impregnation device are integrated into a single device, the maintenance cost of the secondary battery manufacturing device can be reduced.

[0086] In addition, unlike the conventional method of impregnating the electrolyte of each battery cell (50) inside the impregnation chamber by repeatedly increasing and decreasing the pressure inside the impregnation chamber, in the present invention, the electrolyte can be impregnated by repeatedly increasing and decreasing the pressure inside each battery cell (50) through each hopper (200). Accordingly, the amount of high-purity gas (e.g., inert gas, nitrogen) used during pressure increase is significantly reduced, so the manufacturing cost of the secondary battery can be significantly reduced. In addition, since the electrolyte impregnation work is performed while each battery cell (50) is exposed to the outside, if the impregnation is not performed normally or a defect occurs in the electrolyte injection and impregnation device (10), it can be quickly and easily confirmed with the naked eye. In addition, since the time required for increasing and decreasing the pressure is reduced, the time required for the electrolyte impregnation process can be shortened. In addition, since the pressure inside each battery cell (50) is surely increased and decreased, the impregnation can be performed effectively.

[0087] In addition, unlike the conventional method in which the inside of the injection chamber is depressurized to a vacuum atmosphere and then the electrolyte is injected into each battery cell (50) inside the injection chamber, in the present invention, the inside of each battery cell (50) is depressurized to a vacuum atmosphere through an individual hopper (200) and then the electrolyte is injected. Accordingly, the time required for depressurization is reduced, so the time required for the electrolyte injection process can be shortened. In addition, since the pressure inside each battery cell (50) is surely reduced, the electrolyte injection can be performed effectively.

[0088] In addition, since the above-described impregnation chamber and injection chamber are unnecessary, the equipment space is saved and the device (electrolyte injection and impregnation device (10)) can be miniaturized. In addition, since the device is miniaturized, it is easy to identify the cause of the device's failure, so maintenance can be facilitated.

[0089] In addition, a hopper (200) capable of electrolyte injection and pressure increase / decrease can be easily implemented at low cost with a simple configuration.

[0090] In addition, the number and / or length of pipes for connecting the pressure increasing / decreasing units (220) of multiple hoppers (200) to the pressure reducing source (P1) and the pressure increasing source (P2) can be reduced. Accordingly, the manufacturing and maintenance costs of the electrolyte injection and impregnation device (10) can be reduced.

[0091] In addition, since a receiving space (400) and multiple manifolds (500) are provided, the uniformity of pressure increase and decrease in the multiple hoppers (200) and battery cells (50) by the pressure reducing source (P1) and the pressure increasing source (P2) can be improved. Accordingly, the quality of the battery cells (50) can be improved.

[0092] According to embodiments of the present invention, each of the hoppers (200) can directly contact each of the battery cells (50).

[0093] Accordingly, the connecting portion is reduced compared to the conventional structure in which a separate hopper (e.g., the hopper (62) of the conventional carrier (61), FIGS. 1 to 3) is interposed between the battery cell (50) and the hopper (200) of the electrolyte injection device to connect them, so that the electrolyte leakage portion (connecting portion) is reduced and the electrolyte leakage amount can be reduced. Accordingly, the number of times the electrolyte is washed can be reduced, so that the production of secondary batteries can be increased, and problems such as weakening of the sealing force between the battery cell (50) and the hopper (200) caused by electrolyte leakage can be reduced.

[0094] According to embodiments of the present invention, the pressure increasing / decreasing unit (220) may be placed between the tip of the injection unit (210) and the battery cell (50). The electrolyte flowing out from the injection unit (210) may flow into the battery cell (50) through the pressure increasing / decreasing unit (220).

[0095] Accordingly, even if there is a pressure difference between the injection unit (210) and the inside of the battery cell (50) when the electrolyte is injected, the speed of the electrolyte flowing out of the injection unit (210) can be reduced as it passes through the pressure increasing unit (220). Accordingly, the electrode assembly, etc. inside the battery cell (50) can be protected from damage. In addition, since the electrolyte flowing out of the injection unit (210) must pass through the pressure increasing unit (220), it can be prevented from scattering to the outside.

[0096] In addition, when the injection part (210) is closed, the internal pressure of the battery cell (50) can be freely adjusted by the pressure increasing / decreasing part (220) without affecting the injection part (210), so a hopper (200) capable of injection and pressure control can be easily implemented with a simple configuration.

[0097] According to embodiments of the present invention, the injection unit (210) may include an electrolyte storage unit (212) in which an electrolyte introduced from the outside is stored, and an injection needle (214) that opens and closes the injection unit (210) by opening and closing the electrolyte storage unit (212).

[0098] Accordingly, a hopper (200) capable of electrolyte injection and pressure increase / decrease can be easily implemented at low cost with a simple configuration.

[0099] According to embodiments of the present invention, when the injection needle (214) opens the electrolyte storage unit (212), the electrolyte stored in the electrolyte storage unit (212) can flow into the battery cell (50). When the pressure increasing / decreasing unit (220) increases the pressure inside the battery cell (50), the injection needle (214) may not open the electrolyte storage unit (212).

[0100] Accordingly, a hopper (200) capable of electrolyte injection and pressure increase / decrease can be easily implemented at low cost with a simple configuration.

[0101] According to embodiments of the present invention, each of the manifolds (500) may include a common pipe (510) connected to the receiving space (400) and a plurality of branch pipes (520) each connecting the common pipe (510) and the pressure increasing / decreasing units (220) of the different hoppers (200).

[0102] Accordingly, the number and / or length of pipes for connecting the pressure increasing / decreasing units (220) of multiple hoppers (200) to the pressure reducing source (P1) and the pressure increasing source (P2) can be reduced. Accordingly, the manufacturing and maintenance costs of the electrolyte injection and impregnation device (10) can be reduced.

[0103] In addition, since each manifold (500) includes a common pipe (510) and multiple branch pipes (520), the uniformity of pressure increase and decrease in the multiple hoppers (200) and battery cells (50) by the pressure reducing source (P1) and the pressure increasing source (P2) can be improved. Accordingly, the quality of the battery cells (50) can be improved.

[0104] According to embodiments of the present invention, each branch pipe (520) may have one end connected to the common pipe (510) positioned higher than the other end connected to the pressure increasing / decreasing unit (220) of each hopper (200).

[0105] Accordingly, it is possible to prevent electrolyte from flowing into the common pipe (510) and the receiving space (400). Accordingly, the electrolyte injection and impregnation device (10) may not be damaged and its durability may be improved.

[0106] According to embodiments of the present invention, the first angle (L) formed by the straight line connecting the one end and the other end of each branch pipe (520) with the horizontal plane may be 30 degrees or more and 60 degrees or less.

[0107] Accordingly, it is possible to prevent electrolyte from flowing into the common pipe (510) and the receiving space (400).

[0108] According to embodiments of the present invention, each of the hoppers (200) may be connected to the upper end of each of the battery cells (50) mounted on the mounting portion (100). The mounting portion (100) may include a plurality of cell supports (110) on which the plurality of battery cells (50) are mounted and which surround the plurality of battery cells (50). Each of the cell supports (110) may surround the battery cells (50) mounted on the respective cell supports (110) from the lower end to the upper end.

[0109] Accordingly, when the interior of a plurality of battery cells (50) is pressurized to a pressure greater than atmospheric pressure, the battery cells (50) can be stably fixed and supported. Accordingly, damage to the battery cells (50) can be prevented and the impregnation process can be stably performed.

[0110] According to embodiments of the present invention, each of the cell supports (110) may include one or more first grooves (112) that are formed downward from the top of each cell support (110) and penetrate the inside and outside of each cell support (110).

[0111] Accordingly, even if the cell support (110) wraps around the upper portion of the battery cell (50), the battery cell (50) can be easily removed from the cell support (110) through the first groove (112). For example, the gripper (G, FIG. 8) can stably hold the beading portion (53) of the battery cell (50) through the first groove (112) and remove the battery cell (50) from the cell support (110).

[0112] According to embodiments of the present invention, each of the hoppers (200) may be positioned above each of the battery cells (50) mounted on the mounting portions (100) and may be vertically connected to each of the battery cells (50). The hopper may further include a base portion (600) positioned below the plurality of hoppers (200) and relatively movable up and down with respect to the plurality of hoppers (200). The base portion (600) may include a plate-shaped base (610) and a plurality of alignment members (620) installed on the base (610) and formed to protrude upward from the base (610). Each of the alignment members (620) may include an alignment guide portion (622) whose cross-sectional area gradually increases from the top to the bottom, and an alignment fixing portion (624) formed to extend downward from the lower end of the alignment guide portion (622) and having the same cross-sectional area vertically. The above-described fixing member (100) may include a plurality of alignment holes (120) formed vertically and penetratingly, into which the plurality of alignment members (620) are respectively inserted or penetrated. At least a portion of each of the alignment holes (120) has a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the alignment fixing members (624), and an inner surface thereof may be in contact with each of the alignment fixing members (624).

[0113] Accordingly, the mounting portion (100) can be easily aligned and fixedly installed on the base portion (600). Accordingly, when the base portion (600) moves relatively upward, the plurality of battery cells (50) mounted on the mounting portion (100) can each contact or face the plurality of hoppers (200) at precise positions.

[0114] According to embodiments of the present invention, the base portion (600) may include a plurality of elastic members (630) that are respectively coupled to the plurality of alignment members (620). Each of the elastic members (630) may be elastically deformed by the mounting portion (100) and may press the mounting portion (100) upward.

[0115] Accordingly, a plurality of battery cells (50) can be brought into close contact with a plurality of hoppers (200) by a plurality of elastic members (630). Accordingly, electrolyte injection and impregnation can be performed effectively and easily. In addition, shock can be absorbed by the elastic members (630).

[0116] According to embodiments of the present invention, the electrolyte injection and impregnation method (S700) may include a mounting process (S710) of mounting the plurality of battery cells (50) on the mounting portion (100); a connecting process (S720) of connecting the plurality of battery cells (50) to the plurality of hoppers (200), respectively; an injection process (S740) of injecting the electrolyte into the plurality of battery cells (50) through the plurality of hoppers (200); and an impregnation process (S750) of depressurizing and increasing the inside of the plurality of battery cells (50) through the plurality of hoppers (200).

[0117] Accordingly, the electrolyte can be injected and impregnated by simply connecting each hopper (200) of the electrolyte injection and impregnation device (10) to each battery cell (50) once. Accordingly, the manufacturing cost of the secondary battery can be reduced and the manufacturing time can be shortened.

[0118] In addition, the electrolyte can be impregnated by repeatedly increasing and decreasing the pressure inside each battery cell (50) through each hopper (200). Accordingly, the amount of high-purity gas (e.g., inert gas, nitrogen) used during pressurization is significantly reduced, so the manufacturing cost of the secondary battery can be significantly reduced. In addition, since the electrolyte impregnation work is performed while each battery cell (50) is exposed to the outside, if the impregnation is not performed normally or a defect occurs in the electrolyte injection and impregnation device (10), it can be quickly and easily confirmed with the naked eye. In addition, since the time required for increasing and decreasing the pressure is reduced, the time required for the impregnation process can be shortened. In addition, since the pressure inside each battery cell (50) is surely increased and decreased, the impregnation can be effectively performed.

[0119] According to embodiments of the present invention, a depressurization process (S730) may be included for depressurizing the interior of the plurality of battery cells (50) through the plurality of hoppers (200). The liquid injection process (S740) may be performed after the depressurization process (S730).

[0120] Accordingly, the electrolyte can be injected after the interior of each battery cell (50) is depressurized to a vacuum atmosphere through the individual hopper (200). Accordingly, the time required for depressurization is reduced, so the time required for the injection process (S740) can be shortened. In addition, since the pressure inside each battery cell (50) is reliably reduced, the electrolyte injection can be performed effectively.

[0121] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0122] Figure 1 is a front view of an electrolyte injection device according to the prior art.

[0123] Figure 2 is an enlarged view showing the state in which the injector of the electrolyte injection device of Figure 1 is connected to the hopper of the conventional upper case.

[0124] Figure 3 is a front view of an electrolyte impregnation device according to the prior art.

[0125] FIG. 4 and FIG. 5 are a front view and a plan view schematically showing an electrolyte injection and impregnation device according to one embodiment of the present invention.

[0126] Fig. 6 is a perspective view showing a state in which multiple battery cells are mounted on the mounting portion of Fig. 4.

[0127] Figure 7 is an enlarged view showing the cell support of Figure 6.

[0128] Figure 8 is a perspective view showing a gripper for removing a battery cell mounted on a cell support.

[0129] Fig. 9 is a cross-sectional view showing the mounting portion and base portion of Fig. 4.

[0130] Fig. 10 is an enlarged view of a portion of the electrolyte injection and impregnation device of Figs. 4 and 5.

[0131] Fig. 11 is a cross-sectional view of the hopper of the electrolyte injection and impregnation device of Fig. 10.

[0132] Fig. 12 is a perspective view showing the receiving space and manifold of Fig. 10.

[0133] Figures 13 and 14 are perspective and bottom views showing the hopper and manifold of Figure 10.

[0134] Fig. 15 is a perspective view showing a portion of the manifold of Figs. 10 to 14.

[0135] Figure 16 is a flowchart of an electrolyte injection and impregnation method according to one embodiment of the present invention.

[0136] [Explanation of symbols]

[0137] 10: Electrolyte injection and impregnation device

[0138] 50: Battery cell 52: Case

[0139] 53: Bidding Department

[0140] 100: Mounting part 110: Cell support

[0141] 112: 1st home 120: Alignment hole

[0142] 200: Hopper

[0143] 210: Liquid injection unit 212: Electrolyte storage unit

[0144] 214: Injection needle 2142: Electrolyte inlet passage

[0145] 220: Pressure increase / decrease section

[0146] 300: Electrolyte supplier 400: Receiver space

[0147] 500: Manifold

[0148] 510: Common pipe 520: Branch pipe

[0149] 600: Alignment member 622: Alignment guide member

[0150] 624: Alignment fixing part 626: Body part

[0151] 630: Elastic member

[0152] P1: Decompression source P2: Pressure booster source

[0153] T1: Pressure reducing tube T2: Pressure increasing tube

[0154] T3: Vent pipe

[0155] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0156] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0157] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0158] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0159] Additionally, when it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the components may be directly connected or connected to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through another component.

[0160] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0161]

[0162] FIG. 1 is a front view of an electrolyte injection device according to the prior art. FIG. 2 is an enlarged view showing a state in which the injector of the electrolyte injection device of FIG. 1 is coupled to a hopper of a conventional upper case. FIG. 3 is a front view of an electrolyte impregnation device according to the prior art. FIGS. 4 and 5 are front and plan views schematically showing an electrolyte injection and impregnation device according to an embodiment of the present invention. FIG. 6 is a perspective view showing a state in which a plurality of battery cells are seated on the seat of FIG. 4. FIG. 7 is an enlarged view of the cell support of FIG. 6. FIG. 8 is a perspective view showing a gripper for removing a battery cell seated on the cell support. FIG. 9 is a cross-sectional view showing the seat and base of FIG. 4. FIG. 10 is an enlarged view of a portion of the electrolyte injection and impregnation device of FIGS. 4 and 5. FIG. 11 is a cross-sectional view of the hopper of the electrolyte injection and impregnation device of FIG. 10. Fig. 12 is a perspective view showing the receiving space and manifold of Fig. 10. Figs. 13 and 14 are perspective and bottom views showing the hopper and manifold of Fig. 10. Fig. 15 is a perspective view showing a portion of the manifold of Figs. 10 to 14. Fig. 16 is a flowchart of an electrolyte injection and impregnation method according to one embodiment of the present invention.

[0163]

[0164] [Electrolyte injection and impregnation device]

[0165] Referring to FIGS. 4 and 5, an electrolyte injection and impregnation device (10) according to one embodiment may include a mounting portion (100), a plurality of hoppers (200), an electrolyte supply (300), a pressure reducing source (P1), and a pressure increasing source (P2). The electrolyte injection and impregnation device (10) may include a receiving space (400) and a plurality of manifolds (500). The electrolyte injection and impregnation device (10) may include a vent. The electrolyte injection and impregnation device (10) may include a base portion (600).

[0166] The electrolyte supply unit (300) can be connected to a plurality of hoppers (200).

[0167] The decompression source (P1) and the pressure booster source (P2) may be connected to a plurality of hoppers (200), a receiving space (400), and / or a plurality of manifolds (500). The pressure booster source (P2) may be a gas (e.g., nitrogen) supplier. The pressure booster source (P1) may be a vacuum pump.

[0168] The vent may be connected to a plurality of hoppers (200), a receiving space (400) and / or a plurality of manifolds (500).

[0169] Below, the settling portion (100), the hopper (200), the receiving space (400), the multiple manifolds (500), and the base portion (600) will be examined.

[0170]

[0171] [Fixing part, base part]

[0172] Referring further to FIGS. 6 and 7, a plurality of battery cells (50) may be mounted on the mounting portion (100). The mounting portion (100) may include a plurality of cell supports (110). The mounting portion (100) may include a plurality of alignment holes (120).

[0173] The battery cell (50) may include a case (52) and an electrode assembly accommodated within the case (52) (Fig. 6). The case (52) may be opened upward. The case (52) may include a beading portion (53) that is bent inward (Fig. 6). By means of an electrolyte injection and impregnation device (10), an electrolyte may be injected into the case (52) and the electrolyte injected within may be impregnated into the electrode assembly.

[0174] A plurality of cell supports (110) can each have a plurality of battery cells (50) mounted thereon and can surround the plurality of battery cells (50). When each of the hoppers (200) described below is connected to the upper end of each battery cell (50) mounted on the mounting portion (100), each cell support (110) can surround the battery cell (50) mounted on each cell support (110) from the lower end to the upper end.

[0175] Accordingly, when the interior of a plurality of battery cells (50) is pressurized to a pressure greater than atmospheric pressure, the battery cells (50) can be stably fixed and supported. Accordingly, damage to the battery cells (50) can be prevented and the impregnation process can be stably performed.

[0176] Each cell support (110) may include one or more first grooves (112).

[0177] One or more first grooves (112) are formed by recessing downward from the top of each cell support (110) and can penetrate the inside and outside of each cell support (110).

[0178] Accordingly, even if the cell support (110) wraps around the upper portion of the battery cell (50), the battery cell (50) can be easily removed from the cell support (110) through the first groove (112). For example, the gripper (G, FIG. 8) can stably hold the beading portion (53) of the battery cell (50) through the first groove (112) and remove the battery cell (50) from the cell support (110).

[0179] A plurality of alignment holes (120) can be formed vertically and penetratingly (Fig. 6). A plurality of alignment members (620) described below can be inserted into or penetrated through each of the plurality of alignment holes (120).

[0180] Referring further to FIG. 9, the base portion (600) may be positioned lower than the plurality of hoppers (200). The base portion (600) may be relatively movable up and down with respect to the plurality of hoppers (200). At this time, each hopper (200) may be positioned higher than each battery cell (50) mounted on the mounting portion (100) and may be vertically connected to each battery cell (50).

[0181] The base portion (600) may include a plate-shaped base (610) and a plurality of alignment members (620). The base portion (600) may include a plurality of elastic members (630).

[0182] A plurality of alignment members (620) can be installed on the base (610). The plurality of alignment members (620) can be formed to protrude upward from the base (610).

[0183] Each alignment member (620) may include an alignment guide portion (622) and an alignment fixing portion (624). Each alignment member (620) may include a body portion (626).

[0184] The cross-sectional area of ​​the alignment guide section (622) may gradually increase from the top to the bottom.

[0185] The alignment fixing member (624) may be formed to extend downward from the lower end of the alignment guide member (622). The alignment fixing member (624) may have the same cross-sectional area from top to bottom.

[0186] As described above, a plurality of alignment members (620) may be inserted into or penetrated through a plurality of alignment holes (120), respectively. At least a portion of each alignment hole (120) may have a cross-sectional shape and size corresponding to the cross-sectional shape and size of each alignment fixing member (624). An inner surface of at least a portion of each alignment hole (120) may be in contact with each alignment fixing member (624).

[0187] Accordingly, the mounting portion (100) can be easily aligned and fixedly installed on the base portion (600). Accordingly, when the base portion (600) moves relatively upward, the plurality of battery cells (50) mounted on the mounting portion (100) can each contact or face the plurality of hoppers (200) at precise positions.

[0188] Specifically, the alignment guide portion (622) may be inserted or penetrated into the alignment hole (120) so that the mounting portion (100) may be aligned and coupled to the base portion (600). In addition, the alignment fixing portion (624) may be aligned and fixed to the base portion (600) so that the mounting portion (100) may be in contact with the inner surface of the alignment hole (120).

[0189] The body part (626) may be positioned on the lower side of the alignment fixing part (624). The body part (626) may be formed to extend vertically. The body part (626) may be coupled to the base (610). The cross-sectional area of ​​at least the lower portion of the body part (626) may be larger than the cross-sectional area of ​​the alignment fixing part (624). The body part (626) may support the mounting part (100).

[0190] A plurality of elastic members (630) can be respectively combined with a plurality of alignment members (620).

[0191] Each elastic member (630) can be installed on the body portion (626) of each alignment member (620). Each elastic member (630) can wrap around the body portion (626) of each alignment member (620). Each elastic member (630) can be elastically deformed by the mounting portion (100). Each elastic member (630) can press the mounting portion (100) upward.

[0192] Accordingly, a plurality of battery cells (50) can be brought into close contact with a plurality of hoppers (200) by a plurality of elastic members (630). Accordingly, electrolyte injection and impregnation can be performed effectively and easily. In addition, shock can be absorbed by the elastic members (630).

[0193]

[0194] [Multiple Hoppers]

[0195] A plurality of hoppers (200) may be connected to a plurality of battery cells (50) mounted on a mounting portion (100), respectively. The plurality of hoppers (200) may be connected to an electrolyte supply (300). The plurality of hoppers (200) may be connected to a pressure reducing source (P1) and a pressure increasing source (P2). The plurality of hoppers (200) may be connected to a vent.

[0196] An electrolyte can be injected into a plurality of battery cells (50) through a plurality of hoppers (200). In addition, the interior of the plurality of battery cells (50) can be depressurized to a pressure lower than atmospheric pressure and increased to a pressure higher than atmospheric pressure through the plurality of hoppers (200). The interior of the plurality of battery cells (50) can also be ventilated to atmospheric pressure through the plurality of hoppers (200).

[0197] Accordingly, the electrolyte can be injected and impregnated by simply connecting each hopper (200) of the electrolyte injection and impregnation device (10) to each battery cell (50) once. This reduces the manufacturing cost of the secondary battery and shortens the manufacturing time. In addition, since the conventional electrolyte injection device and impregnation device are integrated into a single device, the maintenance cost of the secondary battery manufacturing device can be reduced.

[0198] In addition, unlike the conventional method of impregnating the electrolyte of each battery cell (50) inside the impregnation chamber by repeatedly increasing and decreasing the pressure inside the impregnation chamber, in the present invention, the electrolyte can be impregnated by repeatedly increasing and decreasing the pressure inside each battery cell (50) through each hopper (200). Accordingly, the amount of high-purity gas (e.g., inert gas, nitrogen) used during pressure increase is significantly reduced, so the manufacturing cost of the secondary battery can be significantly reduced. In addition, since the electrolyte impregnation work is performed while each battery cell (50) is exposed to the outside, if the impregnation is not performed normally or a defect occurs in the electrolyte injection and impregnation device (10), it can be quickly and easily confirmed with the naked eye. In addition, since the time required for increasing and decreasing the pressure is reduced, the time required for the electrolyte impregnation process can be shortened. In addition, since the pressure inside each battery cell (50) is surely increased and decreased, the impregnation can be performed effectively.

[0199] In addition, unlike the conventional method in which the inside of the injection chamber is depressurized to a vacuum atmosphere and then the electrolyte is injected into each battery cell (50) inside the injection chamber, in the present invention, the inside of each battery cell (50) is depressurized to a vacuum atmosphere through an individual hopper (200) and then the electrolyte is injected. Accordingly, the time required for depressurization is reduced, so the time required for the electrolyte injection process can be shortened. In addition, since the pressure inside each battery cell (50) is surely reduced, the electrolyte injection can be performed effectively.

[0200] In addition, since the above-described impregnation chamber and injection chamber are unnecessary, the equipment space is saved and the device (electrolyte injection and impregnation device (10)) can be miniaturized. In addition, since the device is miniaturized, it is easy to identify the cause of the device's failure, so maintenance can be facilitated.

[0201] Specifically, it can be confirmed that the amount of high-purity gas (nitrogen) used is significantly reduced, as shown in the table below.

[0202]

[0203] The plurality of hoppers (200) may be formed of a material including iron. The plurality of hoppers (200) may be formed of a material including stainless steel.

[0204] Each hopper (200) can be in direct contact with each battery cell (50). Specifically, the tip of each hopper (200) can be in direct contact with the electrolyte injection port of each battery cell (50). For example, the tip of each hopper (200) can be inserted into the case (52) of each battery cell (50) and can be in close contact with the upper surface of the beading portion (53) protruding inwardly from the inside of the case (52).

[0205] Accordingly, compared to the conventional structure of FIGS. 1 to 3 in which a separate hopper (e.g., hopper (62) of a conventional carrier (61)) is interposed between the battery cell (50) and the hopper (injector (63)) of the electrolyte injection device, the connecting portion is reduced, so that the electrolyte leakage portion (connecting portion) is reduced and the electrolyte leakage amount can be reduced. Accordingly, the number of times the electrolyte is washed can be reduced, so that the production of secondary batteries can increase, and problems such as weakening of the sealing force between the battery cell (50) and the hopper (200) caused by electrolyte leakage can be reduced. For example, if the leaked electrolyte gets on the pusher (not shown) of the mounting portion (100) that presses the battery cell (50) upward from below the battery cell (50), the pusher may stick to a surrounding object due to the viscosity of the electrolyte and may not be able to rise. Accordingly, the sealing force between the battery cell (50) and the hopper (200) may be weakened.

[0206] To elaborate, conventionally, a hopper (62) of a carrier (61) connecting a battery cell (50) and an electrolyte injection device hopper (injector (63)) is interposed between them. Therefore, conventionally, there was no sealing between the hopper (62) of the carrier (61) and the hopper (injector (63)) of the electrolyte injection device, resulting in a large amount of electrolyte leakage (Figs. 1 to 3). Here, the carrier (61) may be a case or pallet used to easily transport and fix a plurality of battery cells (50). Meanwhile, the mounting portion (100) of the present invention may correspond to the lower carrier (61a) among the conventional upper and lower carriers (61a, 61b).

[0207] Referring further to FIGS. 10 and 11, the hopper (200) may include a liquid injection unit (210) and a pressure increasing unit (220).

[0208] The injection unit (210) may be connected to an electrolyte supply unit (300). The injection unit (210) may be in communication with a battery cell (50). The injection unit (210) may allow an electrolyte introduced from outside to be introduced into the battery cell (50). The injection unit (210) may be openable.

[0209] The injection unit (210) may include an electrolyte storage unit (212) and an injection needle (214).

[0210] An electrolyte introduced from outside can be stored in the electrolyte storage unit (212). For example, the injection needle (214) described below may be provided with an electrolyte inlet passage (2142). An electrolyte can be introduced from outside into the electrolyte storage unit (212) through the electrolyte inlet passage (2142).

[0211] The injection needle (214) can open and close the injection unit (210) by opening and closing the electrolyte storage unit (212). When the injection needle (214) opens the electrolyte storage unit (212), the electrolyte stored in the electrolyte storage unit (212) can flow into the battery cell (50).

[0212] For example, the tip of the injection needle (214) can open and close the rear end of the pressure increasing / decreasing unit (220). When the injection needle (214) opens the rear end of the pressure increasing / decreasing unit (220), the electrolyte stored in the electrolyte storage unit (212) can flow into the battery cell (50) through the pressure increasing / decreasing unit (220).

[0213] When the pressure increasing / decreasing unit (220) described later increases the pressure inside the battery cell (50), the main needle (214) may not open the electrolyte storage unit (212).

[0214] Accordingly, a hopper (200) capable of electrolyte injection and pressure increase / decrease can be easily implemented at low cost with a simple configuration.

[0215] The pressure increasing / decreasing unit (220) can be connected to the battery cell (50). The pressure increasing / decreasing unit (220) can be connected to the injection unit (210). The pressure increasing / decreasing unit (220) can be connected to a pressure reducing source (P1) and a pressure increasing source (P2). The pressure increasing / decreasing unit (220) can increase or decrease the pressure inside the battery cell (50).

[0216] Accordingly, a hopper (200) capable of electrolyte injection and pressure increase / decrease can be easily implemented at low cost with a simple configuration.

[0217] The pressure increasing unit (220) may be placed between the tip of the injection unit (210) and the battery cell (50). The electrolyte flowing out from the injection unit (210) may flow into the battery cell (50) through the pressure increasing unit (220).

[0218] Accordingly, even if there is a pressure difference between the injection unit (210) and the inside of the battery cell (50) when the electrolyte is injected, the speed of the electrolyte flowing out of the injection unit (210) can be reduced as it passes through the pressure increasing unit (220). Accordingly, the electrode assembly, etc. inside the battery cell (50) can be protected from damage. In addition, since the electrolyte flowing out of the injection unit (210) must pass through the pressure increasing unit (220), it can be prevented from scattering to the outside.

[0219] In addition, when the injection part (210) is closed, the internal pressure of the battery cell (50) can be freely adjusted by the pressure increasing / decreasing part (220) without affecting the injection part (210), so a hopper (200) capable of injection and pressure control can be easily implemented with a simple configuration.

[0220]

[0221] [Receive space, multiple manifolds]

[0222] Referring further to Fig. 12, the receiving space (400) may be connected to a decompression source (P1) and a pressure boosting source (P2). For example, the receiving space (400) may be connected to a pressure reducing pipe (T1) connected to the decompression source (P1) and a pressure boosting pipe (T2) connected to the pressure boosting source (P2). Accordingly, the interiors of a plurality of manifolds (500) and a plurality of pressure increasing and decreasing units (220) connected to the receiving space (400) may be depressurized or pressure boosted. The receiving space (400) may be a predetermined empty space.

[0223] The receiving space (400) may be connected to a vent. For example, the receiving space (400) may be connected to a vent pipe (T3) connected to the vent. Accordingly, the interiors of the plurality of manifolds (500) and the plurality of pressure increasing / decreasing units (220) connected to the receiving space (400) may be ventilated to atmospheric pressure.

[0224] By opening and closing the valves installed in the pressure reducing tube (T1), the pressure increasing tube (T2), and the vent tube (T3), the interior of the receiving space (400), the manifold (500), the hopper (200), and the battery cell (50) can be depressurized, pressure increasing, and vented to atmospheric pressure.

[0225] Referring further to FIGS. 13 to 15, a plurality of manifolds (500) can each connect a receiving space (400) and a pressure increasing / decreasing unit (220) of a plurality of different hoppers (200).

[0226] Accordingly, the number and / or length of pipes for connecting the pressure increasing / decreasing units (220) of the multiple hoppers (200) to the pressure reducing source (P1) and the pressure increasing source (P2) can be reduced. Accordingly, the manufacturing and maintenance costs of the electrolyte injection and impregnation device (10) can be reduced.

[0227] In addition, since a receiving space (400) and multiple manifolds (500) are provided, the uniformity of pressure increase and decrease in the multiple hoppers (200) and battery cells (50) by the pressure reducing source (P1) and the pressure increasing source (P2) can be improved. Accordingly, the quality of the battery cells (50) can be improved.

[0228] Each manifold (500) may include a common pipe (510) and a plurality of branch pipes (520).

[0229] The common pipe (510) can be connected to the receiving space (400).

[0230] A plurality of branch pipes (520) can each connect the common pipe (510) and the pressure increasing / decreasing section (220) of a plurality of different hoppers (200).

[0231] Accordingly, the number and / or length of pipes for connecting the pressure increasing / decreasing units (220) of multiple hoppers (200) to the pressure reducing source (P1) and the pressure increasing source (P2) can be reduced. Accordingly, the manufacturing and maintenance costs of the electrolyte injection and impregnation device (10) can be reduced.

[0232] In addition, since each manifold (500) includes a common pipe (510) and multiple branch pipes (520), the uniformity of pressure increase and decrease in the multiple hoppers (200) and battery cells (50) by the pressure reducing source (P1) and the pressure increasing source (P2) can be improved. Accordingly, the quality of the battery cells (50) can be improved.

[0233] Each branch pipe (520) may have one end connected to the common pipe (510) positioned higher than the other end connected to the pressure increasing / decreasing unit (220) of each hopper (200).

[0234] Accordingly, it is possible to prevent electrolyte from flowing into the common pipe (510) and the receiving space (400). Accordingly, the electrolyte injection and impregnation device (10) may not be damaged and its durability may be improved.

[0235] The first angle (L) formed by the straight line connecting the one end and the other end of each branch pipe (520) with the horizontal plane may be 30 degrees or more and 60 degrees or less. For example, the first angle (L) may be 45 degrees (Fig. 11).

[0236] Accordingly, it is possible to prevent electrolyte from flowing into the common pipe (510) and the receiving space (400).

[0237]

[0238] [Electrolyte injection and impregnation method]

[0239] Referring to Fig. 16, an electrolyte injection and impregnation method (S700) according to one embodiment may include a settling process (S710), a connecting process (S720), a liquid injection process (S740), and an impregnation process (S750). The electrolyte injection and impregnation method (S700) may include a depressurization process (S730).

[0240] In the settling process (S710), a plurality of battery cells (50) can be settling on the settling portion (100).

[0241] In the connection process (S720), a plurality of battery cells (50) can be connected to a plurality of hoppers (200), respectively.

[0242] In the depressurization process (S730), the interior of a plurality of battery cells (50) can be depressurized through a plurality of hoppers (200). The depressurization process (S730) may be omitted.

[0243] The injection process (S740) can be performed after the depressurization process (S730).

[0244] Accordingly, the electrolyte can be injected after the interior of each battery cell (50) is depressurized to a vacuum atmosphere through the individual hopper (200). Accordingly, the time required for depressurization is reduced, so the time required for the injection process (S740) can be shortened. In addition, since the pressure inside each battery cell (50) is reliably reduced, the electrolyte injection can be performed effectively.

[0245] In the injection process (S740), the electrolyte can be injected into multiple battery cells (50) through multiple hoppers (200).

[0246] In the impregnation process (S750), the inside of multiple battery cells (50) can be depressurized and increased through multiple hoppers (200).

[0247] Accordingly, the electrolyte can be injected and impregnated by simply connecting each hopper (200) of the electrolyte injection and impregnation device (10) to each battery cell (50) once. Accordingly, the manufacturing cost of the secondary battery can be reduced and the manufacturing time can be shortened.

[0248] In addition, the electrolyte can be impregnated by repeatedly increasing and decreasing the pressure inside each battery cell (50) through each hopper (200). Accordingly, the amount of high-purity gas (e.g., inert gas, nitrogen) used during pressurization is significantly reduced, so the manufacturing cost of the secondary battery can be significantly reduced. In addition, since the electrolyte impregnation work is performed while each battery cell (50) is exposed to the outside, if the impregnation is not performed normally or a defect occurs in the electrolyte injection and impregnation device (10), it can be quickly and easily confirmed with the naked eye. In addition, since the time required for increasing and decreasing the pressure is reduced, the time required for the impregnation process can be shortened. In addition, since the pressure inside each battery cell (50) is surely increased and decreased, the impregnation can be effectively performed.

[0249]

[0250] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all possible modifications and variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0251] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A mounting portion (100) on which a plurality of battery cells (50) are mounted; A plurality of hoppers (200) each connected to a plurality of battery cells (50) mounted on the above mounting portion (100); An electrolyte supply unit (300) connected to the above-mentioned plurality of hoppers (200); A depressurization source (P1) and a pressure booster source (P2) connected to the above-mentioned plurality of hoppers (200); A receiving space (400) connected to the above depressurization source (P1) and pressure boosting source (P2); and Containing a plurality of manifolds (500), Through the above plurality of hoppers (200), the electrolyte is injected into the plurality of battery cells (50), and the inside of the plurality of battery cells (50) is depressurized to a pressure lower than atmospheric pressure and then increased to a pressure higher than atmospheric pressure. Each of the above hoppers (200) includes an openable injection unit (210) that allows the electrolyte introduced from the outside to be introduced into the battery cell (50), and a pressure increasing unit (220) that is connected to the pressure reducing source (P1) and the pressure increasing source (P2) and increases or decreases the pressure inside the battery cell (50). Each of the above manifolds (500) connects the receiving space (400) and the pressure increasing / decreasing section (220) of the different hoppers (200). Electrolyte injection and impregnation device.

2. In claim 1, Each of the above hoppers (200) is an electrolyte injection and impregnation device that directly contacts each of the above battery cells (50).

3. In claim 1 or claim 2, The above pressure increasing / decreasing unit (220) is placed between the tip of the injection unit (210) and the battery cell (50). An electrolyte injection and impregnation device in which the electrolyte flowing out from the above-mentioned main part (210) passes through the above-mentioned pressure increasing part (220) and flows into the above-mentioned battery cell (50).

4. In any one of claims 1 to 3, The above-mentioned injection unit (210) is an electrolyte injection and impregnation device including an electrolyte storage unit (212) in which an electrolyte introduced from the outside is stored, and an injection needle (214) that opens and closes the injection unit (210) by opening and closing the electrolyte storage unit (212).

5. In claim 4, When the above-mentioned main needle (214) opens the above-mentioned electrolyte storage unit (212), the electrolyte stored in the electrolyte storage unit (212) flows into the battery cell (50). An electrolyte injection and impregnation device in which the injection needle (214) does not open the electrolyte storage unit (212) when the pressure increasing / decreasing unit (220) increases the pressure inside the battery cell (50).

6. In any one of claims 1 to 5, An electrolyte injection and impregnation device, wherein each of the above manifolds (500) includes a common pipe (510) connected to the receiving space (400) and a plurality of branch pipes (520) each connecting the common pipe (510) and the pressure increasing and decreasing parts (220) of the different hoppers (200).

7. In claim 6, Each of the above branch pipes (520) is an electrolyte injection and impregnation device, wherein one end connected to the common pipe (510) is positioned higher than the other end connected to the pressure increasing / decreasing unit (220) of each of the above hoppers (200).

8. In claim 7, An electrolyte injection and impregnation device, wherein the first angle (L) formed by the straight line connecting the one end and the other end of each of the branch pipes (520) with the horizontal plane is 30 degrees or more and 60 degrees or less.

9. In any one of claims 1 to 8, Each of the above hoppers (200) is connected to the upper end of each of the above battery cells (50) mounted on the mounting portion (100), The above-mentioned fixing member (100) includes a plurality of cell supports (110) on which the plurality of battery cells (50) are respectively fixed and which surround the plurality of battery cells (50). Each of the above cell supports (110) is an electrolyte injection and impregnation device that surrounds each of the above battery cells (50) mounted on each of the above cell supports (110) from the lower side to the upper side.

10. In claim 9, An electrolyte injection and impregnation device, wherein each of the above cell supports (110) includes at least one first groove (112) formed downward from the top of each cell support (110) and penetrating the inside and outside of each cell support (110).

11. In any one of claims 1 to 10, Each of the above hoppers (200) is positioned above each of the above battery cells (50) mounted on the mounting portion (100) and is vertically connected to each of the above battery cells (50). It further includes a base part (600) positioned lower than the above plurality of hoppers (200) and movable up and down relative to the plurality of hoppers (200), The above base part (600) includes a plate-shaped base (610) and a plurality of alignment members (620) installed on the base (610) and formed to protrude upward from the base (610). Each of the above alignment members (620) includes an alignment guide part (622) whose cross-sectional area gradually increases from the top to the bottom, and an alignment fixing part (624) that extends downward from the bottom of the alignment guide part (622) and has the same cross-sectional area from top to bottom. The above-mentioned fixing portion (100) includes a plurality of alignment holes (120) formed vertically and through which the plurality of alignment members (620) are each inserted or penetrated. At least a portion of each of the above alignment holes (120) has a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the above alignment fixing members (624), and the inner surface thereof is in contact with each of the above alignment fixing members (624). Electrolyte injection and impregnation device.

12. In claim 11, The above base part (600) includes a plurality of elastic members (630) that are each combined with the plurality of alignment members (620), An electrolyte injection and impregnation device in which each of the above elastic members (630) can be elastically deformed by the above fixing member (100) and pressurizes the above fixing member (100) upward.

13. An electrolyte injection and impregnation method (S700) using the electrolyte injection and impregnation device (10) of claims 1 to 12, A mounting process (S710) for mounting the plurality of battery cells (50) on the mounting portion (100); A connection process (S720) for connecting the plurality of battery cells (50) to the plurality of hoppers (200), respectively; A process (S740) of injecting the electrolyte into the plurality of battery cells (50) through the plurality of hoppers (200); and Including an impregnation process (S750) for depressurizing and increasing the inside of the plurality of battery cells (50) through the plurality of hoppers (200). Electrolyte injection and impregnation method.

14. In claim 13, It includes a depressurization process (S730) for depressurizing the inside of the plurality of battery cells (50) through the plurality of hoppers (200). The above-mentioned electrolyte injection and impregnation process (S740) is performed after the above-mentioned depressurization process (S730).

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