Electrolyte injection and impregnation apparatus and method

Abstract

The present invention provides an electrolyte injection and impregnation apparatus (10) including: a seating portion (100) in 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 portion (100); an electrolyte supply (300) connected to the plurality of hoppers (200); and a pressure reducing source (P1) and a pressure increasing source (P2) 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) is reduced in pressure to a pressure lower than atmospheric pressure and is increased in pressure to a pressure higher than atmospheric pressure.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2024-0005502, filed on January 12, 2024, the entire contents of which are incorporated herein by reference.

[0002] This invention relates to an electrolyte injection and impregnation apparatus and a method for electrolyte injection and impregnation, wherein the electrolyte injection apparatus and the impregnation apparatus are integrated into a single device, which reduces the maintenance cost of secondary battery manufacturing equipment, reduces the manufacturing cost of secondary batteries, shortens the manufacturing time, allows for quick and easy identification of abnormal operation or defects through visual inspection, and reduces the amount of leaked electrolyte. Background Technology

[0003] Typically, electrolyte injection in secondary batteries is carried out according to the injection chamber and electrolyte injection equipment ( Figure 1 The vacuum, injection, and ventilation are carried out in sequence in section 6). Furthermore, this is achieved through the impregnation chamber ( Figure 3 The electrolyte impregnation process of the battery is performed by alternating vacuum and pressurization in 71).

[0004] To manufacture the battery as described above, both electrolyte injection and impregnation equipment are required, thus increasing the maintenance costs of the secondary battery manufacturing equipment and the manufacturing cost of the secondary battery. This also increases the time required to manufacture the secondary battery, requires more equipment space, and results in larger chambers, making it difficult to identify the causes of equipment defects and hindering maintenance. Furthermore, because the internal pressure of the multiple battery cells 50 in the impregnation chamber must be repeatedly increased and decreased to impregnate them with electrolyte, the amount of high-purity gas (e.g., inert gas, nitrogen) used during pressurization increases, further increasing the manufacturing cost of the secondary battery. Moreover, since electrolyte impregnation is performed using multiple battery cells 50 housed in the chamber, abnormal impregnation or defects in the electrolyte impregnation equipment cannot be quickly and easily identified through visual inspection.

[0005] In addition, traditionally, the hopper 62 of the upper support 61a of the injector 63, which connects the battery cell 50 and the electrolyte injection device 6, is inserted therebetween. Figure 1 and Figure 2 Therefore, traditionally, due to the hopper 62 of the upper support 61a and the injector 63 of the electrolyte injection device ( Figures 1 to 3 The lack of a seal between the battery cells 50 and the hopper 61 results in significant electrolyte leakage. Here, the support 61 can be a housing or tray used to facilitate the transport and securing of the multiple battery cells 50. Consequently, frequent electrolyte flushing reduces the production of secondary batteries, and secondary problems arise due to electrolyte leakage (e.g., weakened sealing between the battery cells 50 and the hopper 61).

[0006] Therefore, a method is needed that can solve the above problems simultaneously.

[0007] The relevant prior art is Korean Patent No. 10-2399085. Summary of the Invention

[0008] Technical issues

[0009] To address the aforementioned problems, one objective of this invention is to provide an electrolyte injection and impregnation apparatus and an electrolyte injection and impregnation method that integrates conventional electrolyte injection and impregnation apparatus into a single device, thereby reducing the maintenance costs of secondary battery manufacturing equipment.

[0010] The purpose of this invention is to provide an electrolyte injection and impregnation device and a method for electrolyte injection and impregnation, which reduces the manufacturing cost and shortens the manufacturing time of secondary batteries.

[0011] One object of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that allows for the rapid and easy identification of abnormal operation or defects using visual inspection.

[0012] The purpose of this invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method that reduces electrolyte leakage (connection portion) and reduces the amount of leaked electrolyte.

[0013] One object of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method, wherein the hopper capable of electrolyte injection and pressure increase and decrease is easily implemented with low cost and simple structure.

[0014] The purpose of this invention is to provide an electrolyte injection and impregnation device and a method for electrolyte injection and impregnation, which improves the uniformity of the increase and decrease of internal pressure in multiple hoppers and battery cells, and prevents damage.

[0015] One object of the present invention is to provide an electrolyte injection and impregnation apparatus and an electrolyte injection and impregnation method, which can prevent damage to battery cells and stably perform the impregnation process.

[0016] One object of the present invention is to provide an electrolyte injection and impregnation device and an electrolyte injection and impregnation method, which facilitates the alignment and fixation of the battery cell mounting base and allows the battery cell to be tightly attached to the hopper.

[0017] The technical problem to be solved by this invention is not limited to the above-described objectives, and other objectives and advantages of the invention not described herein will be understood through the following description, and will become more clearly understood through the embodiments of the invention. Furthermore, it will be apparent that the objectives and advantages of the invention can be embodied by the means and combinations thereof pointed out in the claims.

[0018] Technical solution

[0019] To address the aforementioned problems, the present invention provides an electrolyte injection and impregnation device, comprising: a mounting base 100, multiple hoppers 200, a pressure reducing source P1 and a pressure increasing source P2, a receiving space 400, and multiple manifolds 500.

[0020] Multiple battery cells 50 can be installed on the mounting base 100.

[0021] Multiple hoppers 200 can be connected to multiple battery cells 50 mounted on the mounting base 100.

[0022] The electrolyte supply unit 300 can be connected to multiple hoppers 200.

[0023] Pressure reducing source P1 and pressure increasing source P2 can be connected to multiple hoppers 200.

[0024] The containment space 400 can be connected to the depressurization source P1 and the pressurization source P2.

[0025] Electrolyte can be injected into multiple battery cells 50 through multiple hoppers 200.

[0026] The internal pressure of multiple battery cells 50 can be reduced to below atmospheric pressure through multiple hoppers 200.

[0027] The interior of multiple battery cells 50 can be pressurized to a pressure higher than atmospheric pressure through multiple hoppers 200.

[0028] Each of the plurality of hoppers 200 may include an injector 210 and a pressurization and depressurization unit 220.

[0029] The injector 210 can be configured to introduce externally introduced electrolyte into each of the plurality of battery cells 50.

[0030] The injector 210 can be turned on and off.

[0031] The pressurization and depressurization unit 220 can be connected to the depressurization source P1 and the pressurization source P2.

[0032] The pressurization and depressurization unit 220 can be configured to pressurize or depressurize the interior of each of the plurality of battery cells 50.

[0033] Each of the multiple manifolds 500 can connect the containment space 400 to the pressurization and depressurization units 220 of multiple different hoppers 200.

[0034] In one embodiment, each of the plurality of hoppers 200 may be in direct contact with each of the plurality of battery cells 50.

[0035] In one embodiment, the pressurization and depressurization unit 220 may be disposed between the front end portion of the injector 210 and each of the plurality of battery cells 50.

[0036] The electrolyte discharged from the injector 210 can flow into each of the multiple battery cells 50 through the pressurization and depressurization unit 220.

[0037] In one embodiment, the injector 210 may include an electrolyte reservoir 212 and an injection needle 214.

[0038] Electrolyte introduced from the outside can be stored in electrolyte storage 212.

[0039] The injection needle 214 can turn the injector 210 on and off by turning the electrolyte reservoir 212 on and off.

[0040] In one embodiment, when the injection needle 214 opens the electrolyte storage 212, the electrolyte stored in the electrolyte storage 212 can flow into the interior of each of the plurality of battery cells 50.

[0041] When the pressurization and depressurization unit 220 pressurizes the internal structure of each of the plurality of battery cells 50, the injection needle 214 can shut off the electrolyte reservoir 212.

[0042] In one embodiment, each of the plurality of manifolds 500 may include a common pipe 510 and a plurality of branch pipes 520.

[0043] The common conduit 510 can be connected to the housing space 400.

[0044] Multiple branch pipes 520 can be connected to the common pipe 510 and the pressurization and depressurization units 220 of multiple different hoppers 200.

[0045] In one embodiment, each branch pipe 520 may have an end portion connected to a common pipe 510, which is positioned above the other end of the common pipe 510, which is connected to the pressurization and depressurization unit 220 of each of the plurality of hoppers 200.

[0046] In one embodiment, the first angle L between the horizontal plane and the straight line connecting one end and the other end of each branch pipe 520 can be 30 degrees or greater and 60 degrees or less.

[0047] In one embodiment, each of the plurality of hoppers 200 may be connected to the upper portion of each of the plurality of battery cells 50 mounted on the mounting base 100.

[0048] Mounting base 100 may include multiple cell supports 110.

[0049] Multiple battery cells 50 can be installed on multiple cell supports 110 respectively.

[0050] Multiple cell supports 110 can surround multiple battery cells 50 respectively.

[0051] Each of the plurality of cell supports 110 may surround each of the plurality of battery cells 50 mounted on each of the plurality of cell supports 110 from bottom to top.

[0052] In one embodiment, each of the plurality of cell supports 110 may include at least one first groove 112.

[0053] At least one first groove 112 may be recessed downward from the upper end of each of the plurality of cell supports 110.

[0054] The at least one first groove 112 can penetrate the interior and exterior of each of the plurality of cell supports 110.

[0055] In one embodiment, each of the plurality of hoppers 200 may be arranged above each of the plurality of battery cells 50 mounted on the mounting base 100.

[0056] Each of the multiple hoppers 200 can be vertically connected to each of the multiple battery cells 50.

[0057] The electrolyte injection and impregnation device 10 may also include a base portion 600.

[0058] The base portion 600 can be positioned below multiple hoppers 200.

[0059] The base portion 600 can move vertically relative to the multiple hoppers 200.

[0060] The base portion 600 may include a base 610 and a plurality of alignment members 620.

[0061] The base 610 can be plate-shaped.

[0062] Multiple alignment members 620 can be installed at the base 610.

[0063] Multiple alignment members 620 may be configured to protrude upwards from the base 610.

[0064] Each of the plurality of alignment members 620 may include an alignment guide 622 and an alignment retainer 624.

[0065] The alignment guide 622 may have a cross-sectional area that gradually increases from the top to the bottom.

[0066] The alignment fastener 624 can extend downward from the lower end of the alignment guide 622.

[0067] The alignment fastener 624 can have a constant cross-sectional area in the vertical direction.

[0068] Mounting base 100 may include multiple alignment holes 120.

[0069] Multiple alignment holes 120 can be formed to penetrate vertically.

[0070] Multiple alignment members 620 can be inserted through or through multiple alignment holes 120 respectively.

[0071] At least a portion of each of the plurality of alignment holes 120 may have a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the alignment fasteners 624.

[0072] At least a portion of each of the plurality of alignment holes 120 may have an inner surface that contacts each of the alignment fasteners 624.

[0073] In one embodiment, the base portion 600 may further include a plurality of elastic members 630.

[0074] Multiple elastic members 630 can be connected to multiple alignment members 620 respectively.

[0075] Each of the plurality of elastic members 630 can be elastically deformed by the mounting base 100.

[0076] Each of the plurality of elastic members 630 can apply pressure to the mounting base 100 in an upward direction.

[0077] To address the above problems, the present invention provides an electrolyte injection and impregnation method S700, which includes an installation process S710, a connection process S720, an injection process S740, and an impregnation process S750.

[0078] In the installation process S710, multiple battery cells 50 can be installed on the mounting base 100.

[0079] In the connection process S720, multiple battery cells 50 can be connected to multiple hoppers 200 respectively.

[0080] In the injection process S740, electrolyte can be injected into multiple battery cells 50 through multiple hoppers 200.

[0081] In the impregnation process S750, the interior of multiple battery cells 50 can be depressurized and pressurized through multiple hoppers 200.

[0082] In one embodiment, the electrolyte injection and impregnation method S700 may further include a depressurization process S730.

[0083] In the decompression process S730, the internal pressure of multiple battery cells 50 can be reduced through multiple hoppers 200.

[0084] The injection process S740 can be performed after the decompression process S730.

[0085] Beneficial effects

[0086] According to an embodiment of the present invention, the electrolyte injection and impregnation device 10 may include: a mounting base 100, on which a plurality of battery cells 50 may be mounted; a plurality of hoppers 200, each connected to a plurality of battery cells 50 mounted on the mounting base 100; an electrolyte supply 300 connected to the plurality of hoppers 200; a pressure reducing source P1 and a pressure increasing source P2 connected to the plurality of hoppers 200; a receiving space 400 connected to the pressure reducing source P1 and the pressure increasing source P2; and a plurality of manifolds 500. Electrolyte can be injected into the plurality of battery cells 50 through the plurality of hoppers 200, and the interior of the plurality of battery cells 50 can be depressurized to below atmospheric pressure and pressurized to above atmospheric pressure. Each of the plurality of hoppers 200 may include: an openable and closable injector 210 configured to introduce externally introduced electrolyte into each of the plurality of battery cells 50; and a pressurization and depressurization unit 220 connected to the depressurization source P1 and the pressurization source P2 and configured to pressurize or depressurize the interior of each of the plurality of battery cells 50. Each of the plurality of manifolds (500) may connect the receiving space 400 to the pressurization and depressurization unit 220 of the plurality of different hoppers 200.

[0087] Therefore, by connecting the multiple hoppers 200 of the electrolyte injection and impregnation equipment 10 to each of the multiple battery cells 50 only once, electrolyte can be injected and multiple battery cells 50 can be impregnated. As a result, the manufacturing cost of secondary batteries can be reduced and the manufacturing time can be shortened. In addition, since conventional electrolyte injection and impregnation equipment are integrated into a single device, the maintenance cost of secondary battery manufacturing equipment can be reduced.

[0088] Furthermore, unlike conventional methods where the interior of multiple battery cells 50 in an impregnation chamber is impregnated with electrolyte by repeatedly increasing and decreasing the internal pressure of the impregnation chamber, according to the present invention, the interior of a battery cell 50 can be impregnated with electrolyte by repeatedly increasing and decreasing the internal pressure of each of the multiple battery cells 50 through multiple hoppers 200 respectively. As a result, the amount of high-purity gas (e.g., inert gas, nitrogen) used for pressurization is significantly reduced, thereby significantly reducing the manufacturing cost of the secondary battery. In addition, since electrolyte impregnation is performed simultaneously with the exposure of multiple battery cells 50, any malfunctions in impregnation or defects in the electrolyte injection and impregnation equipment 10 can be quickly and easily visually identified. Furthermore, since the time required for increasing and decreasing pressure is reduced, the time required for the electrolyte impregnation process can be shortened. Moreover, since the internal pressure of the multiple battery cells 50 is clearly increased and decreased, impregnation can be performed efficiently.

[0089] Furthermore, unlike the conventional method of injecting electrolyte into multiple battery cells 50 in the injection chamber after reducing the internal pressure of the injection chamber to a vacuum, electrolyte can be injected after the internal pressure of each of the multiple battery cells 50 is individually reduced to a vacuum through multiple hoppers 200. As a result, the time required to reduce pressure is reduced, thus shortening the time required for the electrolyte injection process. In addition, since the internal pressure of the multiple battery cells 50 is clearly reduced, electrolyte injection can be performed efficiently.

[0090] Furthermore, since the aforementioned conventional impregnation chamber and injection chamber are not necessary, equipment space can be saved, and the equipment (electrolyte injection and impregnation equipment 10) can be miniaturized. In addition, the miniaturization of the equipment makes it easier to identify the cause of equipment failure, thereby facilitating its maintenance.

[0091] In addition, the hopper 200, which is capable of electrolyte injection and pressure increase / decrease, can be easily implemented with low cost and a simple structure.

[0092] Additionally, the number and / or length of pipes used to connect the pressurization and depressurization units 220 of the multiple hoppers 200 to the depressurization source P1 and the pressurization source P2 can be reduced. As a result, the manufacturing and maintenance costs of the electrolyte injection and impregnation equipment 10 can be reduced.

[0093] Furthermore, due to the inclusion of the containment space 400 and multiple manifolds 500, the uniformity of the increase and decrease in internal pressure of the multiple hoppers 200 and multiple battery cells 50 caused by the pressure reduction source P1 and the pressure increase source P2 can be improved. As a result, the quality of the battery cells 50 can be improved.

[0094] According to an embodiment of the present invention, each of the plurality of hoppers 200 may be in direct contact with each of the plurality of battery cells 50.

[0095] Therefore, with Figures 1 to 3 Compared to a conventional structure where a separate hopper (e.g., hopper 62 of a conventional support 61) is inserted between the battery cell 50 and the electrolyte injection device hopper (injector 63), the connection portion is reduced, resulting in a smaller portion (connection portion) for electrolyte leakage and a reduced amount of leaked electrolyte. Consequently, the frequency of electrolyte cleaning can be reduced, thereby increasing the production volume of secondary batteries and mitigating problems such as weakened sealing between the battery cell 50 and the hopper 200 due to electrolyte leakage.

[0096] According to an embodiment of the present invention, a pressurization and depressurization unit 220 may be disposed between the front end portion of the injector 210 and each of the plurality of battery cells 50. Electrolyte discharged from the injector 210 may flow into each of the plurality of battery cells 50 through the pressurization and depressurization unit 220.

[0097] Therefore, even when a pressure difference exists between the injector 210 and the battery cell 50 during electrolyte injection, the rate at which the electrolyte is discharged from the injector 210 decreases as it passes through the pressurization and depressurization unit 220. As a result, the electrode components within the battery cell 50 are not damaged. Furthermore, since the electrolyte discharged from the injector 210 must pass through the pressurization and depressurization unit 220, the electrolyte does not diffuse to the outside.

[0098] Furthermore, since the internal pressure of the multiple battery cells 50 can be freely adjusted by the pressurization and depressurization unit 220 without affecting the injector 210 when the injector 210 is closed, the hopper 200 capable of injection and pressure control can be easily implemented with a simple structure.

[0099] According to an embodiment of the present invention, the injector 210 may include: an electrolyte reservoir 212 in which an electrolyte introduced from the outside is stored; and an injection needle 214, which opens and closes the injector 210 by opening and closing the electrolyte reservoir 212.

[0100] Therefore, the hopper 200, which is capable of electrolyte injection and pressure increase / decrease, can be easily implemented at low cost with a simple construction.

[0101] According to an embodiment of the present invention, when the injection needle 214 opens the electrolyte reservoir 212, the electrolyte stored in the electrolyte reservoir 212 can flow into the interior of each of the plurality of battery cells 50. When the pressurization and depressurization unit 220 pressurizes the interior of each of the plurality of battery cells 50, the injection needle 214 can close the electrolyte reservoir 212.

[0102] Therefore, the hopper 200, which is capable of electrolyte injection and pressure increase / decrease, can be easily implemented at low cost with a simple construction.

[0103] According to an embodiment of the present invention, each of the plurality of manifolds 500 may include: a common pipe 510 connected to the receiving space 400; and a plurality of branch pipes 520, each branch pipe 520 connecting the common pipe 510 and a plurality of different hoppers 200 pressurization and depressurization units 220.

[0104] Therefore, the number and / or length of pipes used to connect the pressurization and depressurization units 220 of the multiple hoppers 200 to the depressurization source P1 and the pressurization source P2 can be reduced. As a result, the manufacturing and maintenance costs of the electrolyte injection and impregnation equipment 10 can be reduced.

[0105] Furthermore, since each of the multiple manifolds 500 includes a common pipe 510 and multiple branch pipes 520, the uniformity of the increase and decrease in internal pressure of the multiple hoppers 200 and multiple battery cells 50 caused by the pressure reducing source P1 and the pressure increasing source P2 can be improved. As a result, the quality of the battery cells 50 can be improved.

[0106] According to an embodiment of the invention, each branch pipe 520 may have one end connected to a common pipe 510, which is disposed above the other end of a pressurization and depressurization unit 220 connected to each of the plurality of hoppers 200.

[0107] Therefore, electrolyte can be prevented from flowing into the common pipe 510 and the containing space 400. As a result, the electrolyte injection and impregnation equipment 10 can be preserved without damage, and its durability can be improved.

[0108] According to an embodiment of the invention, the first angle L between the horizontal plane and the straight line connecting one end and the other end of each branch pipe 520 can be 30 degrees or greater and 60 degrees or less.

[0109] Therefore, it is possible to prevent electrolyte from flowing into the common pipe 510 and the containing space 400.

[0110] According to an embodiment of the present invention, each of the plurality of hoppers 200 may be connected to the upper portion of each of the plurality of battery cells 50 mounted on a mounting base 100. The mounting base 100 may include a plurality of cell supports 110, wherein the plurality of battery cells 50 are respectively mounted around the plurality of battery cells 50. Each of the plurality of cell supports 110 may surround each of the plurality of battery cells 50 mounted on each of the plurality of cell supports 110 from the lower portion to the upper portion.

[0111] Therefore, when the interior of multiple battery cells 50 is pressurized to a pressure greater than atmospheric pressure, the multiple battery cells 50 can be stably fixed and supported. As a result, damage to the battery cells 50 can be prevented, and the impregnation process can be performed stably.

[0112] According to an embodiment of the present invention, each of the plurality of cell supports 110 may include at least one first groove 112, which is recessed downward from the upper end of each of the plurality of cell supports 110 and extends through the interior and exterior of each of the plurality of cell supports 110.

[0113] Therefore, even when the cell support 110 surrounds the upper portion of the battery cell 50, the battery cell 50 can be easily pulled out of the cell support 110 via the first groove 112. For example, a clamp ( Figure 8 G) can stably hold the pressing structure 53 of the battery cell 50 through the first groove 112 and pull the battery cell 50 out from the cell support 110.

[0114] According to an embodiment of the invention, each of the plurality of hoppers 200 may be disposed above each of the plurality of battery cells 50 mounted on the mounting base 100, and may be vertically connected to each of the plurality of battery cells 50. The electrolyte injection and impregnation apparatus may also include a base portion 600 disposed below the plurality of hoppers 200 and vertically movable relative to the plurality of hoppers 200. The base portion 600 may include: a plate-shaped base 610; and a plurality of alignment members 620 mounted on the base 610 and formed to project upwards beyond the base 610. Each of the plurality of alignment members 620 includes: an alignment guide 622 having a cross-sectional area that gradually increases from an upper end toward a downward direction; and an alignment retainer 624 extending downwards from the lower end of the alignment guide 622 and having a constant cross-sectional area. The mounting base 100 may include a plurality of alignment holes 120 formed vertically through which a plurality of alignment members 620 are inserted or pass through the plurality of alignment holes 120 respectively. At least a portion of each of the plurality of alignment holes 120 may have a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the alignment members 624, and have an inner surface that contacts each of the alignment members 624.

[0115] Therefore, the mounting base 100 can be easily aligned and securely mounted on the base portion 600. As a result, when the base portion 600 moves upward relative to the base portion 600, the plurality of battery cells 50 mounted on the mounting base 100 can contact or face the plurality of hoppers 200 at precise positions.

[0116] According to an embodiment of the present invention, the base portion 600 may further include a plurality of elastic members 630 respectively connected to a plurality of alignment members 630. Each of the plurality of elastic members 630 may be elastically deformed by the mounting base 100 and apply pressure to the mounting base 100 in an upward direction.

[0117] Therefore, multiple battery cells 50 can be in close contact with multiple hoppers 200 through multiple elastic members 630. This allows for efficient and easy electrolyte injection and impregnation. Furthermore, impacts can be absorbed by the elastic members 630.

[0118] According to an embodiment of the present invention, the electrolyte injection and impregnation method S700 may include: an installation process S710 of mounting a plurality of battery cells 50 on a mounting base 100; a connection process S720 of connecting the plurality of battery cells 50 to a plurality of hoppers 200 respectively; an injection process S740 of injecting electrolyte into the plurality of battery cells 50 through the plurality of hoppers 200; and an impregnation process S750 of depressurizing and pressurizing the interior of the plurality of battery cells 50 through the plurality of hoppers 200.

[0119] Therefore, by connecting the multiple hoppers 200 of the electrolyte injection and impregnation device 10 to each of the multiple battery cells 50 only once, electrolyte can be injected and multiple battery cells 50 can be impregnated. As a result, the manufacturing cost of secondary batteries can be reduced and the manufacturing time can be shortened.

[0120] Furthermore, the internal pressure of the multiple battery cells 50 can be individually and repeatedly increased and decreased through multiple hoppers 200 to impregnate the interior of the battery cells 50 with electrolyte. As a result, the amount of high-purity gas (e.g., inert gas, nitrogen) used for pressurization is significantly reduced, allowing for a significant reduction in the manufacturing cost of the secondary battery. Moreover, since electrolyte impregnation is performed simultaneously with the exposure of the multiple battery cells 50, any malfunctions in impregnation or defects occurring in the electrolyte injection and impregnation equipment 10 can be quickly and easily visually identified. Additionally, the time required for increasing and decreasing pressure is reduced, thus shortening the overall time required for the electrolyte impregnation process. Furthermore, since the internal pressure of the multiple battery cells 50 is precisely increased and decreased, impregnation can be performed efficiently.

[0121] According to an embodiment of the present invention, the electrolyte injection and impregnation method may further include: a depressurization process S730, in which the internal pressure of the plurality of battery cells 50 is reduced through the plurality of hoppers 200. The injection process S740 may be performed after the depressurization process S730.

[0122] Therefore, electrolyte can be injected after the internal pressure of an individual battery cell 50 is reduced to a vacuum through a separate hopper 200. As a result, the time required to reduce pressure is reduced, thus shortening the time required for the electrolyte injection process. Furthermore, since the internal pressure of multiple battery cells 50 is significantly reduced, electrolyte injection can be performed efficiently.

[0123] In addition to the aforementioned beneficial effects, the specific effects of the present invention will be further described while describing the specific details of the invention. Attached Figure Description

[0124] Figure 1 This is a front view of a traditional electrolyte injection device.

[0125] Figure 2 It shows the connection to Figure 1 An enlarged view of the injector in the hopper of the upper shell of a traditional electrolyte injection device.

[0126] Figure 3 This is a front view of a traditional electrolyte impregnation device.

[0127] Figure 4 and Figure 5The diagrams schematically show the front view and plan view of the electrolyte injection and impregnation apparatus according to embodiments of the present invention.

[0128] Figure 6 It shows the installation on Figure 4 A 3D view of multiple battery cells on the mounting bracket.

[0129] Figure 7 yes Figure 6 An enlarged view of the battery cell support structure.

[0130] Figure 8 This is a perspective view showing a clamp for removing battery cells mounted on a cell support.

[0131] Figure 9 It is shown Figure 4 Cross-sectional view of the mounting bracket and base portion.

[0132] Figure 10 It is shown Figure 4 and 5 Enlarged view of part of the electrolyte injection and impregnation equipment.

[0133] Figure 11 yes Figure 10 A cross-sectional view of the hopper of the electrolyte injection and impregnation equipment.

[0134] Figure 12 It is shown Figure 10 A three-dimensional diagram of the storage space and manifold.

[0135] Figure 13 and Figure 14 It shows Figure 10 3D and bottom views of the hopper and manifold.

[0136] Figure 15 It shows Figures 10 to 14 A three-dimensional view of the manifold section.

[0137] Figure 16 This is a flowchart illustrating an electrolyte injection and impregnation method according to an embodiment of the present invention.

[0138] [Explanation of reference numerals in the attached figures]

[0139] 10: Electrolyte injection and impregnation equipment

[0140] 50: Battery cell; 52: Casing

[0141] 53: Edge clamping structure

[0142] 100: Mounting bracket; 110: Cell support body

[0143] 112: First groove; 120: Alignment hole

[0144] 200: Hopper

[0145] 210: Injector; 212: Electrolyte reservoir

[0146] 214: Injection needle; 2142: Electrolyte inlet channel

[0147] 220: Pressurization and depressurization unit

[0148] 300: Electrolyte supply unit; 400: Reservoir space

[0149] 500: Manifold

[0150] 510: Public pipe; 520: Branch pipe

[0151] 600: Alignment component; 622: Alignment guide.

[0152] 624: Alignment fastener; 626: Main body.

[0153] 630: Elastic Component

[0154] P1: Pressure reducing source P2: Pressure increasing source

[0155] T1: Pressure reducing pipe; T2: Pressure increasing pipe

[0156] T3: Discharge pipe Detailed Implementation

[0157] The above-described objects, features, and advantages will now be described in detail with reference to the accompanying drawings, enabling those skilled in the art to implement the technical ideas of the present invention. In describing the present invention, detailed descriptions of prior art related to the present invention will be omitted where it is determined that such detailed descriptions unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In these drawings, the same reference numerals are used to denote the same or similar parts.

[0158] Although terms such as "first," "second," etc., are used to describe various elements, these elements are of course not limited by these terms. These terms are only used to distinguish one element from another, and unless otherwise specified, the first element may also be the second element.

[0159] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0160] In the following text, “arranging a component above (or below) a component” or “arranging a component on top (or bottom) of a component” means not only “arranging a component to contact the upper (or lower) surface”, but also “arranging a component above the upper (or lower) surface with another component inserted between it.”

[0161] Additionally, when an element is described as being “connected to,” “linked to,” or “in contact with” another element, it should be understood that the element may be “directly connected to,” “directly linked to,” or “directly in contact with” another element, or that the element may be “connected to,” “linked to,” or “in contact with” another element and another element is inserted between them or is “connected to,” “linked to,” or “in contact with” another element via another element.

[0162] Unless the context clearly indicates otherwise, the singular expressions used herein include the plural expressions. Terms such as “compose of” or “comprising” used herein should not be construed as including all elements or steps described in the specification, but rather as excluding certain elements or steps, or including additional elements or steps.

[0163] Figure 1 This is a front view of a traditional electrolyte injection device. Figure 2 It shows the connection to Figure 1 An enlarged view of the injector in the hopper of the upper shell of a traditional electrolyte injection device. Figure 3 This is a front view of a traditional electrolyte impregnation device. Figure 4 and Figure 5 The diagrams schematically show the front view and plan view of the electrolyte injection and impregnation apparatus according to embodiments of the present invention. Figure 6 It shows the installation on Figure 4 A 3D view of multiple battery cells on the mounting bracket. Figure 7 It is shown Figure 6 An enlarged view of the battery cell support structure. Figure 8 This is a perspective view showing a clamp for removing battery cells mounted on a cell support. Figure 9 It is shown Figure 4 Cross-sectional view of the mounting bracket and base portion. Figure 10 It is shown Figure 4 and 5 Enlarged view of part of the electrolyte injection and impregnation equipment. Figure 11 yes Figure 10 A cross-sectional view of the hopper of the electrolyte injection and impregnation equipment. Figure 12 It is shown Figure 10 A three-dimensional diagram of the storage space and manifold. Figure 13 and Figure 14 It shows Figure 10 3D and bottom views of the hopper and manifold. Figure 15 It shows Figures 10 to 14 A three-dimensional view of the manifold section. Figure 16 This is a flowchart illustrating an electrolyte injection and impregnation method according to an embodiment of the present invention.

[0164] Electrolyte injection and impregnation equipment

[0165] See Figure 4 and Figure 5 An electrolyte injection and impregnation apparatus 10 according to one embodiment may include: a mounting base 100; a plurality of hoppers 200; a pressure reducing source P1; and a pressure increasing source P2. The electrolyte injection and impregnation apparatus 10 may also include a receiving space 400 and a plurality of manifolds 500. The electrolyte injection and impregnation apparatus 10 may also include an exhaust port. The electrolyte injection and impregnation apparatus 10 may also include a base portion 600.

[0166] The electrolyte supply unit 300 can be connected to multiple hoppers 200.

[0167] Pressure reducing source P1 and pressure increasing source P2 can be connected to multiple hoppers 200, containment space 400 and / or multiple manifolds 500. Pressure increasing source P2 can be a gas (e.g., nitrogen) supply source. Pressure reducing source P1 can be a vacuum pump.

[0168] The vents can be connected to multiple hoppers 200, containment space 400 and / or multiple manifolds 500.

[0169] The mounting base 100, hopper 200, receiving space 400, multiple manifolds 500 and base portion 600 will be described below.

[0170] [Mounting base and base]

[0171] See further Figure 6 and Figure 7 Multiple battery cells 50 can be mounted on the mounting base 100. The mounting base 100 may include multiple cell supports 110. The mounting base 100 may include multiple alignment holes 120.

[0172] Battery cell 50 may include housing 52 and electrode assembly housed in housing 52. Figure 6 The housing 52 may have an open upper end. The housing 52 may include an inwardly bent pressure edge structure 53. Figure 6 Electrolyte can be injected into housing 52 via electrolyte injection and impregnation device 10, and electrode assemblies can be impregnated with electrolyte injected into housing 52.

[0173] Multiple battery cells 50 can be respectively mounted on multiple cell supports 110, and the multiple cell supports 110 can respectively surround the multiple battery cells 50. When each of the multiple hoppers 200 is connected to the upper portion of each of the multiple battery cells 50 mounted on the mounting base 100, each cell support 110 can surround the battery cell 50 mounted on each cell support 110 from the lower portion to the upper portion of the battery cell.

[0174] Therefore, when the interior of multiple battery cells 50 is pressurized to a pressure greater than atmospheric pressure, the multiple battery cells 50 can be stably fixed and supported. As a result, damage to the battery cells 50 can be prevented, and the impregnation process can be performed stably.

[0175] Each cell support 110 may include at least one first groove 112.

[0176] The at least one first groove 112 may be recessed downward from the upper end of each of the plurality of cell supports 110 and pass through the interior and exterior of each of the plurality of cell supports 110.

[0177] Therefore, even when the cell support 110 surrounds the upper portion of the battery cell 50, the battery cell 50 can be easily pulled out of the cell support 110 via the first groove 112. For example, a clamp ( Figure 8 G) can stably hold the pressing structure 53 of the battery cell 50 through the first groove 112 and pull the battery cell 50 out from the cell support 110.

[0178] Multiple alignment holes 120 can be formed to penetrate vertically therethrough. Figure 6 The multiple alignment members 620, described later, can be inserted through or through the multiple alignment holes 120, respectively.

[0179] Further reference Figure 9 The base portion 600 may be disposed below the plurality of hoppers 200. The base portion 600 may be vertically movable relative to the plurality of hoppers 200. Here, each of the plurality of hoppers 200 may be disposed above each of the plurality of battery cells 50 mounted on the mounting base 100 and vertically connected to each of the plurality of battery cells 50 mounted on the mounting base 100.

[0180] The base portion 600 may include: a plate-shaped base 610; and a plurality of alignment members 620. The base portion 600 may also include a plurality of elastic members 630.

[0181] Multiple alignment members 620 may be mounted on the base 610. The multiple alignment members 620 may be configured to protrude upward from the base 610.

[0182] Each of the plurality of alignment members 620 may include: an alignment guide 622; and an alignment retainer 624. Each alignment member 620 may include a body 626.

[0183] The alignment guide 622 may have a cross-sectional area that gradually increases from the top to the bottom.

[0184] The alignment fastener 624 can extend downward from the lower end of the alignment guide 622. The alignment fastener 624 can have a constant cross-sectional area in the vertical direction.

[0185] As described above, the plurality of alignment members 620 can be inserted through or through the plurality of alignment holes 120 respectively. At least a portion of each of the plurality of alignment holes 120 may have a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the alignment fasteners 624. At least a portion of each of the plurality of alignment holes 120 may have an inner surface that contacts each of the alignment fasteners 624.

[0186] Therefore, the mounting base 100 can be easily aligned and securely mounted on the base portion 600. As a result, when the base portion 600 moves upward relative to the base portion 600, the plurality of battery cells 50 mounted on the mounting base 100 can contact or face the plurality of hoppers 200 at precise positions.

[0187] Specifically, when the alignment guide 622 is inserted through or through the alignment hole 120, the mounting base 100 can be aligned and attached to the base portion 600. Alternatively, the mounting base 100 can be aligned and secured to the base portion 600 using the alignment fastener 624, which contacts the inner surface of the alignment hole 120.

[0188] The main body 626 can be positioned below the alignment fastener 624. The main body 626 can extend vertically. The main body 626 can be connected to the base 610. At least the cross-sectional area of ​​the lower portion of the main body 626 can be larger than the cross-sectional area of ​​the alignment fastener 624. The main body 626 can support the mounting base 100.

[0189] Multiple elastic members 630 can be connected to multiple alignment members 620 respectively.

[0190] Each of the plurality of elastic members 630 may be mounted at the body 626 of each of the plurality of alignment members 620. Each of the plurality of elastic members 630 may surround the body 626 of each of the plurality of alignment members 620. Each of the plurality of elastic members 630 may be elastically deformable by the mounting base 100. Each of the plurality of elastic members 630 may apply pressure to the mounting base 100 in an upward direction.

[0191] Therefore, multiple battery cells 50 can be in close contact with multiple hoppers 200 through multiple elastic members 630. This allows for efficient and easy electrolyte injection and impregnation. Furthermore, impacts can be absorbed by the elastic members 630.

[0192] [hopper]

[0193] Multiple hoppers 200 can be connected to multiple battery cells 50 mounted on the mounting base 100. Multiple hoppers 200 can be connected to an electrolyte supply 300. Multiple hoppers 200 can be connected to a pressure reducing source P1 and a pressure increasing source P2. Multiple hoppers 200 can be connected to a vent.

[0194] Electrolyte can be injected into multiple battery cells 50 through multiple hoppers 200. Furthermore, the internal pressure of the multiple battery cells 50 can be reduced to below atmospheric pressure and pressurized to above atmospheric pressure through the multiple hoppers 200. The internal pressure of the multiple battery cells 50 can also be ventilated to atmospheric pressure through the multiple hoppers 200.

[0195] Therefore, by connecting the multiple hoppers 200 of the electrolyte injection and impregnation equipment 10 to each of the multiple battery cells 50 only once, electrolyte can be injected and multiple battery cells 50 can be impregnated. As a result, the manufacturing cost of secondary batteries can be reduced and the manufacturing time can be shortened. In addition, since conventional electrolyte injection and impregnation equipment are integrated into a single device, the maintenance cost of secondary battery manufacturing equipment can be reduced.

[0196] Furthermore, unlike the conventional method of impregnating the interior of multiple battery cells 50 in an impregnation chamber with electrolyte by repeatedly increasing and decreasing the internal pressure of the impregnation chamber, according to the present invention, the interior of the battery cells 50 can be impregnated with electrolyte by repeatedly increasing and decreasing the internal pressure of each of the multiple battery cells 50 through multiple hoppers 200 respectively. As a result, the amount of high-purity gas (e.g., inert gas, nitrogen) used for pressurization is significantly reduced, thereby significantly reducing the manufacturing cost of the secondary battery. In addition, since electrolyte impregnation is performed while the multiple battery cells 50 are exposed, it is possible to quickly and easily visually confirm if impregnation is not performed properly or if defects occur in the electrolyte injection and impregnation equipment 10. Furthermore, since the time required for increasing and decreasing pressure is reduced, the time required for the electrolyte impregnation process can be shortened. Moreover, since the internal pressure of the multiple battery cells 50 is clearly increased and decreased, impregnation can be performed efficiently.

[0197] Furthermore, unlike the conventional method of injecting electrolyte into multiple battery cells 50 in the injection chamber after reducing the internal pressure of the injection chamber to a vacuum, electrolyte can be injected after the internal pressure of each of the multiple battery cells 50 is individually reduced to a vacuum through multiple hoppers 200. As a result, the time required for pressure reduction is reduced, thus shortening the time required for the electrolyte injection process. In addition, since the internal pressure of the multiple battery cells 50 is precisely reduced, electrolyte injection can be performed efficiently.

[0198] Furthermore, since the aforementioned conventional impregnation chamber and injection chamber are not necessary, equipment space can be saved, and the equipment (electrolyte injection and impregnation equipment 10) can be miniaturized. In addition, the miniaturization of the equipment makes it easier to identify the cause of equipment failure, thereby facilitating its maintenance.

[0199] Specifically, it can be confirmed that the amount of high-purity gas (nitrogen) used has been significantly reduced, as shown in the table below.

[0200]

[0201] The multiple hoppers 200 can be made of materials including iron. The multiple hoppers 200 can be made of materials including stainless steel.

[0202] Each of the plurality of hoppers 200 can directly contact each of the plurality of battery cells 50. For example, the front end portion of each of the plurality of hoppers 200 can be inserted into the housing 52 of each of the plurality of battery cells 50 respectively, and can be in close contact with the upper surface of the pressing structure 53 that protrudes inward into the interior of the housing 52.

[0203] Therefore, a separate hopper (e.g., hopper 62 of a conventional support 61) is inserted therebetween, along with the hopper (injector 63) connecting the battery cell 50 and the electrolyte injection device. Figures 1 to 3 Compared to traditional structures, the reduced size of the connecting portion decreases the amount of electrolyte leakage (connecting portion) and reduces the amount of leaked electrolyte. As a result, the frequency of electrolyte cleaning can be reduced, thereby increasing the production capacity of secondary batteries and mitigating problems such as weakened sealing between the battery cell 50 and the hopper 200 due to electrolyte leakage. For example, when leaked electrolyte adheres to the pusher (not shown) pressing upwards from below the mounting base 100 of the battery cell 50, the pusher may adhere to surrounding objects due to the viscosity of the electrolyte and may not rise. Therefore, the sealing force between the battery cell 50 and the hopper 200 can be weakened.

[0204] For detailed explanation, conventionally, the hopper 62 of the battery cell 50 and the electrolyte injection device (injector 63) of the support 61 is inserted therebetween. Therefore, conventionally, due to the connection between the hopper 62 of the support 61 and the electrolyte injection device ( Figures 1 to 3 The lack of a seal between the hoppers (injector 63) results in significant electrolyte leakage. Here, the support 61 can be a housing or tray for facilitating the transport and securing of multiple battery cells 50. Alternatively, the mounting base 100 of the present invention can correspond to the lower support 61a in a conventional upper support 61a and lower support 61b.

[0205] See further Figure 10 and11 Each of the plurality of hoppers 200 may include: an injector 210; and a pressurization and depressurization unit 220.

[0206] Injector 210 can be connected to electrolyte supply 300. Injector 210 can be connected to multiple battery cells 50. Injector 210 can be configured to introduce externally introduced electrolyte into each of the multiple battery cells 50. Injector 210 can be openable and closeable.

[0207] The injector 210 may include an electrolyte reservoir 212 and an injection needle 214.

[0208] Electrolyte introduced from the outside can be stored in the electrolyte reservoir 212. For example, the injection needle 214 described below can be provided with an electrolyte inlet channel 2142. Electrolyte can be introduced from the outside into the electrolyte reservoir 212 through the electrolyte inlet channel 2142.

[0209] The injection needle 214 can open and close the injector 210 by opening and closing the electrolyte reservoir 212. When the injection needle 214 opens the electrolyte reservoir 212, the electrolyte stored in the electrolyte reservoir 212 can be introduced into the interior of each of the plurality of battery cells 50.

[0210] For example, the front end of the injection needle 214 can open and close the rear end of the pressurization and depressurization unit 220. When the injection needle 214 opens the rear end of the pressurization and depressurization unit 220, the electrolyte stored in the electrolyte reservoir 212 can flow into the interior of each of the plurality of battery cells 50 through the pressurization and depressurization unit 220.

[0211] When the pressurization and depressurization unit 220, described later, pressurizes the interior of the plurality of battery cells 50, the injection needle 214 shuts off the electrolyte reservoir 212.

[0212] Therefore, the hopper 200, which is capable of electrolyte injection and pressure increase / decrease, can be easily implemented with low cost and simple construction.

[0213] The pressurization and depressurization unit 220 can be connected to multiple battery cells 50. The pressurization and depressurization unit 220 can be connected to the injector 210. The pressurization and depressurization unit 220 can be connected to depressurization source P1 and pressurization source P2. The pressurization and depressurization unit 220 can be configured to pressurize or depressurize the interior of each of the multiple battery cells 50.

[0214] Therefore, the hopper 200, which is capable of electrolyte injection and pressure increase / decrease, can be easily implemented with low cost and simple construction.

[0215] A pressurization and depressurization unit 220 may be disposed between the front end of the injector 210 and each of the plurality of battery cells 50. Electrolyte discharged from the injector 210 may flow into each of the plurality of battery cells 50 through the pressurization and depressurization unit 220.

[0216] Therefore, even when a pressure difference exists between the injector 210 and the battery cell 50 during electrolyte injection, the rate at which the electrolyte is discharged from the injector 210 decreases as the electrolyte passes through the pressurization and depressurization unit 220. As a result, the electrode components within the battery cell 50 are not damaged. Furthermore, since the electrolyte discharged from the injector 210 must pass through the pressurization and depressurization unit 220, the electrolyte does not diffuse to the outside.

[0217] Furthermore, since the internal pressure of the multiple battery cells 50 can be freely adjusted by the pressurization and depressurization unit 220 without affecting the injector 210 when the injector 210 is closed, the hopper 200 capable of injection and pressure control can be easily implemented with a simple structure.

[0218] [Containment space and manifold]

[0219] Further reference Figure 12 The accommodating space 400 can be connected to a pressure reducing source P1 and a pressure increasing source P2. For example, the accommodating space 400 can be connected to a pressure reducing pipe T1 connected to the pressure reducing source P1 and a pressure increasing pipe T2 connected to the pressure increasing source P2. Therefore, the interiors of the plurality of manifolds 500 and the plurality of pressure increasing and pressure decreasing units 220 connected to the accommodating space 400 can be depressurized or pressurized. The accommodating space 400 can be a predetermined empty space.

[0220] The containment space 400 can be connected to a vent. For example, the containment space 400 can be connected to a vent pipe T3 connected to the vent. Therefore, the interiors of the plurality of manifolds 500 and the plurality of pressurization and depressurization units 220 connected to the containment space 400 can be ventilated to atmospheric pressure.

[0221] By opening and closing the valves installed at the pressure reducing pipe T1, pressure increasing pipe T2, and venting pipe T3, the interior of the containment space 400, manifold 500, hopper 200, and battery cell 50 can be depressurized, pressurized, and vented to atmospheric pressure.

[0222] Further reference Figures 13 to 15 Each of the multiple manifolds 500 can be connected to a pressurization and depressurization unit 220 of a containment space 400 and multiple different hoppers 200.

[0223] Therefore, the number and / or length of pipes used to connect the pressurization and depressurization units 220 of the multiple hoppers 200 to the depressurization source P1 and the pressurization source P2 can be reduced. As a result, the manufacturing and maintenance costs of the electrolyte injection and impregnation equipment 10 can be reduced.

[0224] Furthermore, due to the inclusion of the containment space 400 and multiple manifolds 500, the uniformity of the increase and decrease in internal pressure of the multiple hoppers 200 and multiple battery cells 50 caused by the pressure reduction source P1 and the pressure increase source P2 can be improved. As a result, the quality of the battery cells 50 can be improved.

[0225] Each of the multiple manifolds 500 may include a common pipe 510 and multiple branch pipes 520.

[0226] The common conduit 510 can be connected to the housing space 400.

[0227] Multiple branch pipes 520 can be connected to the common pipe 510 and the pressurization and depressurization units 220 of multiple different hoppers 200.

[0228] Therefore, the number and / or length of pipes used to connect the pressurization and depressurization units 220 of the multiple hoppers 200 to the depressurization source P1 and the pressurization source P2 can be reduced. As a result, the manufacturing and maintenance costs of the electrolyte injection and impregnation equipment 10 can be reduced.

[0229] Furthermore, since each of the multiple manifolds 500 includes a common pipe 510 and multiple branch pipes 520, the uniformity of the increase and decrease in internal pressure of the multiple hoppers 200 and multiple battery cells 50 caused by the pressure reducing source P1 and the pressure increasing source P2 can be improved. As a result, the quality of the battery cells 50 can be improved.

[0230] Each branch pipe 520 may have one end connected to a common pipe 510, which is positioned above the other end of the branch pipe 520, which is connected to a pressurization and depressurization unit 220 of each of the plurality of hoppers 200.

[0231] Therefore, electrolyte can be prevented from flowing into the common pipe 510 and the containing space 400. As a result, the electrolyte injection and impregnation equipment 10 can be preserved without damage, and its durability can be improved.

[0232] The first angle L between the horizontal plane and the straight line connecting one end of each branch pipe 520 and the other end can be 30 degrees or greater and 60 degrees or less. For example, the first angle L can be 45 degrees. Figure 11 ).

[0233] Therefore, it is possible to prevent electrolyte from flowing into the common pipe 510 and the containing space 400.

[0234] [Electrolyte injection and impregnation methods]

[0235] Reference Figure 16 The electrolyte injection and impregnation method S700 according to the embodiment may include an installation process S710, a connection process S720, an injection process S740, and an impregnation process S750. The electrolyte injection and impregnation method S700 may also include a depressurization process S730.

[0236] In the installation process S710, multiple battery cells 50 can be installed on the mounting base 100.

[0237] In the connection process S720, multiple battery cells 50 can be connected to multiple hoppers 200 respectively.

[0238] In the pressure reduction process S730, the internal pressure of multiple battery cells 50 can be reduced through multiple hoppers 200. The pressure reduction process S730 can be omitted.

[0239] The injection process S740 can be performed after the decompression process S730.

[0240] Therefore, electrolyte can be injected after the internal pressure of the individual battery cells 50 is reduced to a vacuum through multiple hoppers 200. This reduces the time required to reduce pressure, thus shortening the injection process S740. Furthermore, since the internal pressure of the multiple battery cells 50 is significantly reduced, electrolyte injection can be performed efficiently.

[0241] In the injection process S740, electrolyte can be injected into multiple battery cells 50 through multiple hoppers 200.

[0242] In the impregnation process S750, the interior of multiple battery cells 50 can be depressurized and pressurized through multiple hoppers 200.

[0243] Therefore, by connecting the multiple hoppers 200 of the electrolyte injection and impregnation device 10 to each of the multiple battery cells 50 only once, electrolyte can be injected and multiple battery cells 50 can be impregnated. As a result, the manufacturing cost of secondary batteries can be reduced and the manufacturing time can be shortened.

[0244] Furthermore, the internal pressure of the multiple battery cells 50 can be individually and repeatedly increased and decreased through multiple hoppers 200 to impregnate the interior of the battery cells 50 with electrolyte. As a result, the amount of high-purity gas (e.g., inert gas, nitrogen) used for pressurization is significantly reduced, allowing for a significant reduction in the manufacturing cost of the secondary battery. Moreover, since electrolyte impregnation is performed simultaneously with the exposure of the multiple battery cells 50, any malfunctions in impregnation or defects occurring in the electrolyte injection and impregnation equipment 10 can be quickly and easily visually identified. Additionally, the time required for increasing and decreasing pressure is reduced, thus shortening the overall time required for the electrolyte impregnation process. Furthermore, since the internal pressure of the multiple battery cells 50 is precisely increased and decreased, impregnation can be performed efficiently.

[0245] It should be understood that the described embodiments are illustrative in all respects and not restrictive, and the scope of the invention will be indicated by the appended claims rather than the detailed description described. Furthermore, the meaning and scope of the following claims, as well as all modifications and variations derived from equivalent concepts, should be interpreted as being included within the scope of the invention.

[0246] Although the invention has been described with reference to exemplary accompanying drawings, it should be understood that the invention is not limited to the embodiments and drawings disclosed in this specification, and those skilled in the art will understand that various modifications are possible without departing from the scope and spirit of the invention. Furthermore, although the operational effects of the configuration according to the invention are not explicitly described while describing embodiments of the invention, it should be understood that predictable effects can be recognized through this configuration.

Claims

1. An electrolyte injection and impregnation apparatus, the electrolyte injection and impregnation apparatus comprising: Mounting base (100), where multiple battery cells (50) are mounted; Multiple hoppers (200) are respectively connected to multiple battery cells (50) mounted on the mounting base (100); An electrolyte supply (300) is connected to the plurality of hoppers (200); Pressure reducing source (P1) and pressure increasing source (P2) are connected to the plurality of hoppers (200). A receiving space (400) is connected to the pressure reducing source (P1) and the pressure increasing source (P2). and Multiple manifolds (500). Electrolyte is injected into the plurality of battery cells (50) through the plurality of hoppers (200), and the internal pressure of the plurality of battery cells (50) is reduced to below atmospheric pressure and then pressurized to above atmospheric pressure. Each of the plurality of hoppers (200) includes: an injector (210) that can be opened and closed, the injector (210) being configured to introduce externally introduced electrolyte into each of the plurality of battery cells (50); and a pressurization and depressurization unit (220) connected to the depressurization source (P1) and the pressurization source (P2) and configured to pressurize or depressurize the interior of each of the plurality of battery cells (50), and Each of the plurality of manifolds (500) connects the containment space (400) to the pressurization and depressurization units (220) of the plurality of different hoppers (200).

2. The electrolyte injection and impregnation device according to claim 1, wherein, Each of the plurality of hoppers (200) is in direct contact with each of the plurality of battery cells (50).

3. The electrolyte injection and impregnation apparatus according to any one of claims 1 and 2, wherein, The pressurization and depressurization unit (220) is disposed between the front end portion of the injector (210) and each of the plurality of battery cells (50), and The electrolyte discharged from the injector (210) flows through the pressurization and depressurization unit (220) into each of the plurality of battery cells (50).

4. The electrolyte injection and impregnation apparatus according to any one of claims 1 to 3, wherein, The injector (210) includes: an electrolyte reservoir (212) storing an externally introduced electrolyte; and an injection needle (214) that opens and closes the injector (210) by opening and closing the electrolyte reservoir (212).

5. The electrolyte injection and impregnation device according to claim 4, wherein, When the injection needle (214) opens the electrolyte storage (212), the electrolyte stored in the electrolyte storage (212) flows into the interior of each of the plurality of battery cells (50), and When the pressurization and depressurization unit (220) pressurizes the interior of each of the plurality of battery cells (50), the injection needle (214) shuts off the electrolyte storage (212).

6. The electrolyte injection and impregnation apparatus according to any one of claims 1 to 5, wherein, Each of the plurality of manifolds (500) includes a common pipe (510) and a plurality of branch pipes (520), the common pipe (510) being connected to the receiving space (400), and each of the branch pipes (520) being connected to the common pipe (510) and the pressurization and depressurization units (220) of a plurality of different hoppers (200).

7. The electrolyte injection and impregnation device according to claim 6, wherein, Each of the branch pipes (520) has one end connected to the common pipe (510), the one end being positioned above the other end of the pressurization and depressurization unit (220) of the branch pipe connected to each of the plurality of hoppers (200).

8. The electrolyte injection and impregnation apparatus according to claim 7, wherein, The first angle (L) between the horizontal plane and the straight line connecting one end and the other end of each of the branch pipes (520) is 30 degrees or greater and 60 degrees or less.

9. The electrolyte injection and impregnation apparatus according to any one of claims 1 to 8, wherein, Each of the plurality of hoppers (200) is connected to the upper end of each of the plurality of battery cells (50) mounted on the mounting base (100). The mounting base (100) includes a plurality of cell supports (110), and the plurality of battery cells (50) are respectively mounted on the plurality of cell supports (110). The plurality of cell supports (110) surround the plurality of battery cells (50), and Each of the plurality of cell supports (110) extends from the bottom to the top around the battery cell (50) mounted on each of the plurality of cell supports (110).

10. The electrolyte injection and impregnation apparatus according to claim 9, wherein, Each of the plurality of cell supports (110) includes at least one first groove (112) that is recessed downward from the upper end of each of the plurality of cell supports (110) and extends through the interior and exterior of each of the plurality of cell supports (110).

11. The electrolyte injection and impregnation apparatus according to any one of claims 1 to 10, wherein, Each of the plurality of hoppers (200) is disposed above each of the plurality of battery cells (50) mounted on the mounting base (100) and is vertically connected to each of the plurality of battery cells (50). The electrolyte injection and impregnation device further includes a base portion (600) disposed below the plurality of hoppers (200) and vertically movable relative to the plurality of hoppers (200). The base portion (600) includes: a plate-shaped base (610); and a plurality of alignment members (620) mounted on the base (610) and formed to project upward above the base (610). Each of the plurality of alignment members (620) includes: an alignment guide (622) having a cross-sectional area that gradually increases from an upper end toward a downward direction; and an alignment fixing member (624) extending downward from the lower end of the alignment guide (622) and having a constant vertical cross-sectional area. The mounting base (100) includes a plurality of alignment holes (120) formed vertically through, and the plurality of alignment members (620) are respectively inserted into or through the plurality of alignment holes (120). At least a portion of each of the plurality of alignment holes (120) has a cross-sectional shape and size corresponding to the cross-sectional shape and size of each of the alignment members (624) and has an inner surface that contacts each of the alignment members (624).

12. The electrolyte injection and impregnation apparatus according to claim 11, wherein, The base portion (600) further includes a plurality of elastic members (630) respectively connected to the plurality of alignment members (620), each of the plurality of elastic members (630) being elastically deformable by the mounting base (100) and applying pressure to the mounting base (100) in an upward direction.

13. An electrolyte injection and impregnation method (S700) using an electrolyte injection and impregnation apparatus (10) according to any one of claims 1 to 12, the electrolyte injection and impregnation method (S700) comprising: The mounting process (S710) involves mounting multiple battery cells (50) onto a mounting base (100). Connection process (S720) in which multiple battery cells (50) are connected to multiple hoppers (200) respectively. An injection process (S740) in which electrolyte is injected into the plurality of battery cells (50) through multiple hoppers (200). and An impregnation process (S750) in which the interior of the plurality of battery cells (50) is subjected to depressurization and pressurization through multiple hoppers (200).

14. The electrolyte injection and impregnation method (S700) according to claim 13, further comprising: The pressure reduction process (S730) reduces the internal pressure of the multiple battery cells (50) through the multiple hoppers (200). The injection process (S740) is performed after the decompression process (S730).

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