Secondary battery electrolyte injection device

Abstract

The present invention relates to an electrolyte injection device for a secondary battery, and more particularly, to an electrolyte injection device for a secondary battery comprising: a frame unit including a lower plate and an upper plate spaced a predetermined distance from the lower plate and having a central opening; a pallet unit detachably positioned above the lower plate and having a lower hopper to which secondary batteries and electrolyte are supplied; a liquid injection unit positioned above the pallet unit for supplying electrolyte to the lower hopper; and a needle unit positioned above the upper plate for supplying electrolyte to the liquid injection unit, wherein the liquid injection unit and the needle unit are detachable from the upper plate.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0009002, filed January 19, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an electrolyte injection device for a secondary battery, and more particularly to an electrolyte injection device having a structure that allows easy replacement and maintenance of the injection section. [Background technology]

[0003] As technological development and demand for mobile devices continues to grow, rechargeable secondary batteries are being used as energy sources for various mobile devices. Secondary batteries are also attracting attention as energy sources for electric vehicles and hybrid electric vehicles, which are being proposed as alternatives to existing gasoline-powered vehicles and diesel-powered vehicles that use fossil fuels.

[0004] Depending on the shape of the battery case, secondary batteries are classified into cylindrical batteries and prismatic batteries, in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch batteries, in which the electrode assembly is housed in a pouch-shaped case made of an aluminum laminate sheet.

[0005] Meanwhile, when manufacturing a cylindrical battery, an electrolyte injection process is required in which an electrolyte is injected into a case containing an electrode assembly so that the electrode assembly is fully immersed, and then the case is left for a certain period of time so that the electrolyte fills the microscopic voids inside the electrode assembly.

[0006] In this regard, FIG. 1 is a conceptual diagram of a conventional electrolytic solution supplying device, and FIG. 2 is a partially enlarged view of the conventional electrolytic solution supplying device.

[0007] As shown in FIG. 1, a conventional electrolyte supplying device is disclosed that includes a base nozzle member 10 equipped with multiple nozzle portions 11, a plunger member 20 that opens and closes a discharge port 11a, a plunger fixing plate member 30, a lifting means 40 that raises and lowers the plunger fixing plate member 30, a plate guide portion 50 that guides the operation of the lifting means 40, a housing member 60, and a vacuum pump 70.

[0008] In such a conventional electrolyte supply device, the nozzle portion 11 has a supply chamber 12 that receives the electrolyte, and a discharge outlet 11a that discharges the electrolyte is formed at the bottom, so that the electrolyte in the supply chamber 12 is injected into the inside of the battery case 5.

[0009] 2, plunger member 20 has an opening / closing part 21 at its end that is inserted into opening / closing groove 11b to close discharge port 11a, and an O-ring 21a that fits tightly against the inner circumferential surface of opening / closing groove 11b is coupled to opening / closing part 21. Therefore, when plunger member 20 is lowered and inserted into opening / closing groove 11b, O-ring 21a fits tightly against the inner circumferential surface of opening / closing groove 11b, sealing it to close discharge port 11a and hermetically seal the inside of supply chamber 12.

[0010] Since the electrolyte injection process is an essential process for manufacturing a secondary battery, the above-described process must be repeated countless times, which requires replacement or maintenance of various parts.

[0011] However, in conventional electrolyte supply devices, the case jig member 61 including the storage case members 62 and the battery case 5 is built into the housing member 60, and a vacuum pump 70 is connected to the side of the housing member 60, making it very difficult to separate the case jig member 61. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Korean Patent Publication No. 10-2009-0036793 [Patent Document 2] Korean Patent No. 10-1876834 Summary of the Invention [Problem to be solved by the invention]

[0013] SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an electrolyte injection device for a secondary battery having a structure that allows an injection section for supplying electrolyte to be easily separated.

[0014] Another object of the present invention is to provide an electrolyte injection device for a secondary battery having a structure that allows each unit component that constitutes the injection section to be easily attached and detached.

[0015] It is another object of the present invention to provide an electrolyte injection device for a secondary battery that allows the injection section to be attached or detached quickly and stably. [Means for solving the problem]

[0016] To solve the above problems, the electrolyte injection device for a secondary battery according to the present invention includes a frame unit (100) including a lower plate (110) and an upper plate (120) spaced a predetermined distance from the lower plate (110) and having an opening in the center; a pallet unit (200) detachably positioned above the lower plate (110) and including a lower hopper (212) to which secondary batteries (B) and electrolyte are supplied; a liquid injection unit (300) positioned above the pallet unit (200) for supplying electrolyte to the lower hopper (212); and a needle unit (400) positioned above the upper plate (120) for supplying electrolyte to the liquid injection unit (300), wherein the liquid injection unit (300) and the needle unit (400) are detachable from the upper plate (120).

[0017] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the injection unit (300) includes a plate-shaped first holder (310) having a second through-hole (311) formed therein, a socket unit (320) accommodated in the second through-hole (311), an upper hopper (330) extending above the first holder (310) with its lower side fastened to the socket unit (320), and a nozzle unit (340) extending below the first holder (310) with its upper side fastened to the socket unit (320), and the needle unit (400) includes a plate-shaped second holder (410) having a third through-hole (411) formed therein and a needle (420) accommodated in the second holder (410).

[0018] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the first holder (310) and the upper plate (120) are detachably connected to each other by a male / female screw fastening method.

[0019] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the socket part (320) is fixed to the second through hole (311) by a male / female screw fastening method.

[0020] In the electrolyte injection device for a secondary battery according to the present invention, the upper hopper (330) is fixed to the socket part (320) by a male / female screw fastening method.

[0021] In the electrolyte injection device for a secondary battery according to the present invention, the nozzle part (340) is fixed to the socket part (320) by a male / female screw fastening method.

[0022] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the injection unit (300) further includes a sealing member (350) accommodated in the socket unit (320), and the sealing member (350) is interposed between the upper hopper (330) and the nozzle unit (340).

[0023] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the injection part (300) further includes a first handle (360) for holding the first holder (310).

[0024] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the nozzle part (340) is a hollow tube-shaped part that is open at the top and bottom and has one or more slits (341) formed on the side.

[0025] In the electrolyte injection device for a secondary battery according to the present invention, the one or more slits (341) are formed in a spiral shape along the side of the nozzle part (340).

[0026] The electrolyte injection device for a secondary battery according to the present invention further comprises a lift unit (500) for supporting and elevating the injection unit (300).

[0027] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the lift unit (500) is characterized by including a base unit (510), a support unit (520) that supports the bottom surface of the first holder (310), and a lift unit (530) for raising and lowering the support unit (520).

[0028] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the lifting unit (530) is characterized by including: a lifting bar (531) located between the base unit (510) and the support unit (520) and including a first lifting bar (531a) and a second lifting bar (531b) crossing each other and connected by a hinge structure; a connecting bar (532) fastened to one end of the first lifting bar (531a); a screw shaft (533) extending to a certain length to guide the forward and backward movement of the connecting bar (532); and an operating unit (534) for moving the connecting bar (532) forward or backward.

[0029] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the lifting unit (530) further includes a guide bar (535) for guiding the connection bar (532) forward or backward.

[0030] In addition, in the electrolyte injection device for a secondary battery according to the present invention, the lift part (500) further includes a second handle (540) for holding the base part (510). [Effects of the Invention]

[0031] According to the electrolyte injection device for a secondary battery of the present invention, the injection section is located below the lower plate and is detachably fixed to the lower plate, which has the advantage of making inspection and repair very easy.

[0032] In addition, according to the electrolyte injection device for a secondary battery of the present invention, the first holder, socket part, upper hopper, and nozzle part constituting the injection part can be fixed or separated using a male / female screw fastening method, which has the advantage of facilitating replacement of each part and reducing the working time.

[0033] Furthermore, the electrolyte injection device for a secondary battery of the present invention further includes a lift for separating or attaching the injection part, which has the advantage of not only reducing the risk of accidents during work but also reducing the time required for attachment and detachment. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 is a conceptual diagram of an electrolytic solution supply device according to the prior art. [Figure 2] FIG. 1 is a partially enlarged view of a conventional electrolytic solution supply device. [Figure 3] 1 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, showing a state in which an injection part and a needle part are coupled together and a lift part is attached below the injection part; [Figure 4] 4 is a perspective view of the electrolyte injection device for the secondary battery shown in FIG. 3, seen from another direction. [Figure 5] FIG. 4 is a perspective view showing the internal shape of the electrolyte injection device for the secondary battery shown in FIG. 3. [Figure 6] 6 is a front view of an electrolyte injection device for the secondary battery shown in FIG. 5. [Figure 7] 1 is a perspective view of a pallet portion attached to an electrolyte injection device for a secondary battery according to the present invention; [Figure 8] FIG. 8 is a front view of the pallet unit shown in FIG. [Figure 9] 1 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, showing a state in which the injection part and the needle part are separated and a lift part is attached below the injection part. [Figure 10] 10 is a front view of the electrolyte injection device for the secondary battery shown in FIG. 9. [Figure 11] 10 is a perspective view showing the inside of an electrolyte injection device for the secondary battery shown in FIG. [Figure 12] 1 is a perspective view of a state in which a liquid injection part constituting an electrolyte injection device for a secondary battery according to the present invention is seated on a lift part. [Figure 13] 13 is a front view of the liquid injection part shown in FIG. 12 seated on the lift part. FIG. [Figure 14] 1 is a perspective view of a liquid injection section constituting an electrolyte injection device for a secondary battery according to the present invention. [Figure 15] FIG. 15 is a front view of the liquid injection part shown in FIG. [Figure 16] FIG. 16 is an enlarged cross-sectional view of part A in FIG. 15. [Figure 17] FIG. 16 is an exploded perspective view of part A in FIG. [Figure 18] 5A to 5C are cross-sectional views illustrating the process of disassembling each component constituting the electrolyte injection section of the electrolyte injection device for a secondary battery according to the present invention. [Figure 19] 1 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, showing a state before the injection unit and the pallet unit are joined together. [Figure 20] FIG. 20 is a front view of the state before the liquid injection section and the pallet section shown in FIG. 19 are joined together. [Figure 21] 1 is a front view of an electrolyte injection device for a secondary battery according to the present invention, showing a state in which an injection unit and a pallet unit are coupled together. [Figure 22] 1 is a perspective view of a needle attached to an electrolyte injection device for a secondary battery according to the present invention. [Figure 23] 4 is a cross-sectional view illustrating a coupling structure between a liquid injection part and a needle part in the electrolyte injection device for a secondary battery according to the present invention. FIG. [Figure 24] 3 is an enlarged view of a sealing member constituting the injection section of the electrolyte injection device for a secondary battery according to the present invention. FIG. [Figure 25] 1 is a perspective view of a lift portion constituting an electrolyte injection device for a secondary battery according to the present invention, as viewed from one direction. [Figure 26] FIG. 26 is a perspective view of the lift unit shown in FIG. 25 as seen from another direction. DETAILED DESCRIPTION OF THE INVENTION

[0035] In this application, the terms "comprises," "has," "has," and the like are intended to specify the presence of features, numbers, steps, elements, components, or combinations thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

[0036] Furthermore, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element therebetween. Furthermore, unless otherwise specified, "including a certain element" does not mean that other elements are excluded, but that other elements may also be included.

[0037] An electrolyte injection device for a secondary battery according to the present invention will now be described with reference to the accompanying drawings.

[0038] FIG. 3 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, in which the injection part and the needle part are connected and a lift part is attached below the injection part. FIG. 4 is a perspective view of the electrolyte injection device for a secondary battery shown in FIG. 3, seen from another direction. FIG. 5 is a perspective view showing the internal state of the electrolyte injection device for a secondary battery shown in FIG. 3. FIG. 6 is a front view of the electrolyte injection device for a secondary battery shown in FIG. 5.

[0039] 7 is a perspective view of a pallet portion attached to the electrolyte injection device for a secondary battery according to the present invention, and FIG. 8 is a front view of the pallet portion shown in FIG.

[0040] 9 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, in which the injection part and the needle part are separated and a lift part is attached below the injection part, FIG. 10 is a front view of the electrolyte injection device for a secondary battery shown in FIG. 9, and FIG. 11 is a perspective view showing the interior of the electrolyte injection device for a secondary battery shown in FIG. 9.

[0041] FIG. 12 is a perspective view of the state in which the injection part constituting the electrolyte injection device for a secondary battery according to the present invention is seated on the lift part, and FIG. 13 is a front view of the injection part shown in FIG. 12 seated on the lift part.

[0042] The electrolyte injection device for a secondary battery according to the present invention may include a frame unit 100, a pallet unit 200, an injection unit 300, and a needle unit 400, and may further include a lift unit 500 as necessary.

[0043] First, the frame unit 100 is configured to support the pallet unit 200, the injection unit 300, the needle unit 400, etc., and may include a lower plate 110, an upper plate 120, a side plate 130, and a vertical frame 140.

[0044] The lower plate 110 is configured to selectively support the pallet section 200 or the lift section 500 .

[0045] Upper plate 120 is located above lower plate 110 and has an opening in the center so that upper hopper 330 constituting liquid injection section 300 protrudes upward, and liquid injection section 300 is removably fixed to upper plate 120.

[0046] For example, the upper plate 120 and the liquid injection part 300 may be fastened by a male / female screw fastening method such as a bolt and nut, but the fastening method is not limited thereto.

[0047] The side plate 130 extends downward along the edge of the upper plate 120 to form an enclosed space, and the vertical frame 140 is connected to a needle unit 400 located on the upper part of the upper plate 120. Of course, it is preferable that the needle unit 400 is also detachably fastened to the frame unit 100.

[0048] For example, although not shown in the drawings, a support frame (not shown) may be connected to the side plate 130 to space it at a certain height from the ground, and the outer shape of the support frame (not shown) is not particularly limited.

[0049] In Figures 3 to 6, the lower part of the lift part 500 is seated on the upper surface of the approximately rectangular lower plate 110, and the upper part of the lift part 500 is in close contact with the bottom surface of the liquid injection part 300, but when injecting electrolyte into the secondary battery, the pallet part 200 having a structure as shown in Figures 7 and 8 comes into close contact with the upper surface of the lower plate 110 and the bottom surface of the liquid injection part 300.

[0050] More specifically, when injecting electrolyte into the secondary battery, the pallet section 200 including the lower pallet 220 containing the secondary battery B is brought into close contact with the bottom surface of the injection section 300 so that the electrolyte can be supplied to the secondary battery B.

[0051] Here, the pallet unit 200 is seated on the upper surface of the lower plate 110, and the lower plate 110 has a structure that allows it to be raised and lowered by a separate lifting member (not shown).

[0052] Therefore, before or after the electrolyte is poured, the position of the pallet unit 200 changes as the lower plate 110 moves up and down.

[0053] On the other hand, since electrolyte is injected repeatedly over a long period of time, maintenance such as inspection and part replacement is necessary.

[0054] 9 to 12, when inspection, replacement, or repair of the components constituting liquid injection unit 300 is required, lift unit 500 is seated on the upper surface of lower plate 110 and operates to support liquid injection unit 300 so that liquid injection unit 300 can be moved downward. A detailed description of liquid injection unit 300 and lift unit 500 will be given later.

[0055] 7 and 8, the pallet unit 200 may be composed of an upper pallet 210 and a lower pallet 220 that are separable from each other and whose vertical separation distance is adjustable.

[0056] The upper pallet 210 is formed with a number of first through holes 211, and each of the first through holes 211 houses a substantially cylindrical lower hopper 212 that is open at the top and bottom and has an empty interior.

[0057] The lower hopper 212 is configured to guide the electrolyte supplied from the liquid injection section 300 to the secondary battery B.

[0058] The lower pallet 220 is formed with a large number of accommodation grooves 221 so that secondary batteries B that require electrolyte injection can be accommodated therein.

[0059] Here, the upper ends of the secondary batteries B are open to allow the electrolyte to flow in, and the number of the secondary batteries B is preferably the same as the lower hoppers 212 and they are preferably located on the same vertical extension line.

[0060] 3 to 6 and 9 to 11, the needle unit 400 is located above the liquid injection unit 300 and is configured to supply the electrolyte to the liquid injection unit 300. In detail, the needle unit 400 includes a plate-shaped second holder 410 having a plurality of third through-holes 411, and a needle 420 for supplying the electrolyte to the upper hopper 330 and restricting or allowing the electrolyte supplied to the upper hopper 330 to be supplied to the lower hopper 212, which will be described in detail later.

[0061] Meanwhile, secondary battery B is a cylindrical secondary battery or a prismatic secondary battery in a state before a cap assembly is attached. Generally, a cylindrical secondary battery is obtained by placing a jelly-roll-type electrode assembly, which is made by interposing a separator between a long sheet-shaped positive electrode and a negative electrode, and winding the electrode assembly, in a battery case, injecting an electrolyte, and then attaching and fixing the cap assembly.

[0062] The secondary battery B of the present invention has an electrode assembly housed in a battery case, the top of which is open, and the electrode assembly corresponds to a known technical configuration, so detailed description thereof will be omitted.

[0063] Fig. 14 is a perspective view of a liquid injection part constituting an electrolyte injection device for a secondary battery according to the present invention, and Fig. 15 is a front view of the liquid injection part shown in Fig. 14. Also, Fig. 16 is an enlarged cross-sectional view of part A in Fig. 15, Fig. 17 is an exploded perspective view of part A in Fig. 15, and Fig. 18 is a cross-sectional view illustrating the process of disassembling each component constituting the liquid injection part in the electrolyte injection device for a secondary battery according to the present invention.

[0064] The liquid inlet unit 300 is located on the upper part of the pallet unit 200 and is configured to supply the electrolyte to the lower hopper 212, and may include a first holder 310, a socket unit 320, an upper hopper 330, a nozzle unit 340, a sealing member 350, and a first handle 360.

[0065] First, the first holder 310 is in the shape of a substantially flat plate, and has a large number of second through holes 311 formed therein.

[0066] The socket part 320 is mounted in the second through-hole 311 and serves to fix the upper hopper 330, the nozzle part 340, and the sealing member 350 thereto.

[0067] Explaining in more detail with reference to Figures 16 to 18, the socket portion 320 is open at the top and bottom, surrounded by side walls 321 so as to have a space inside, and the horizontal cross section may be circular.

[0068] Here, the inner space of the socket 320 may be composed of a first space S1 located at the top, a second space S2 located below the first space S1, a third space S3 located below the second space S2, and a fourth space S4 located below the third space S3. Here, the inner diameters of the first space S1, the second space S2, the fourth space S4, and the third space S3 decrease in this order.

[0069] In addition, a first step portion 322, a second step portion 323, and a third step portion 324 are provided at the boundary point between the first space portion S1 and the second space portion S2, the boundary point between the second space portion S2 and the third space portion S3, and the boundary point between the third space portion S3 and the fourth space portion S4, respectively, so that the inner diameters of each space portion are different.

[0070] Therefore, the lower side of the upper hopper 330 extends upward while being coupled to the first space S1 of the socket 320, and the upper side of the nozzle 340 extends downward while being coupled to the third space S3 and the fourth space S4 of the socket 320. The sealing member 350 is structured to be interposed between the lower side of the upper hopper 330 and the upper side of the nozzle 340, i.e., the second space S2.

[0071] The upper hopper 330, which extends a predetermined length upward while its lower side remains fixed to the socket part 320, temporarily stores the electrolyte supplied from the needle part 400 and is approximately cylindrical with open top and bottom.

[0072] The nozzle part 340, whose upper part remains fixed to the socket part 320 and extends downward to a predetermined length, is a hollow tube-shaped part that is open at the top and bottom and has an empty interior, and is positioned inside the lower hopper 212 when the electrolyte is injected.

[0073] Here, it is preferable that one or more slits 341 are provided on the side surface of the nozzle part 340, and more preferably, the one or more slits 341 are formed in a spiral shape along the side surface.

[0074] The electrolyte supplied to the secondary batteries accommodated in the lower pallet must always be poured at a constant amount. However, if the supplied electrolyte splashes and sticks to the inner wall of the lower hopper or leaks to the outside, deviations in the amount of electrolyte poured may occur, leading to defects.

[0075] For example, in addition to a certain amount of electrolyte, air is mixed above the electrolyte in the upper hopper 330. However, since the electrolyte supply process is carried out under reduced pressure, air is immediately sucked in when the electrolyte filled in the upper hopper 330 moves to the lower hopper.

[0076] This air strikes the electrolyte in the lower hopper, causing it to splash and stick to the inner wall of the lower hopper, which can result in insufficient electrolyte being injected into the secondary batteries, or conversely, excessive electrolyte being injected into some secondary batteries due to the electrolyte that has stuck to the inner wall.

[0077] However, when one or more slits 341 are provided on the side, the air drawn in after the electrolyte is transferred is dispersed through the lower opening of the nozzle part 340 and the slits 341 on the side, thereby minimizing the scattering of the electrolyte.

[0078] Meanwhile, it is preferable that at least one of the socket part 320, the upper hopper 330 and the nozzle part 340 has a detachable structure, and more preferably, all of them have a detachable structure.

[0079] As mentioned above, the electrolyte injection device may require repair, inspection, or replacement of parts during use.

[0080] Therefore, if the inner surface of the second through-hole 311 is provided with a female screw portion and the outer surface of the side wall 321 of the socket portion 320 is provided with a male screw portion, the socket portion 320 can be attached and detached very easily.

[0081] Furthermore, if the inner surface of the side wall 321 corresponding to the first space S1 of the socket portion 320 is provided with a female thread portion and the lower outer surface of the upper hopper 330 is provided with a male thread portion, the upper hopper 330 can be attached and detached very easily.

[0082] Furthermore, if a female thread portion is provided on the inner surface of the side wall 321 corresponding to the third space S3 of the socket portion 320 and a male thread portion is provided on the upper outer surface of the nozzle portion 340, it becomes very easy to attach and detach the nozzle portion 340. Of course, the fourth space S4 of the socket portion 320 can also be provided with a female thread portion. In this case, the nozzle portion 340 also has a male thread portion.

[0083] Meanwhile, the inner surface of the side wall 321 corresponding to the second space S2 of the socket 320 does not need to be provided with a female thread. This is because the sealing member 350 made of an elastic material is positioned in the second space S2, and the sealing member 350 can be replaced by separating the upper hopper 330.

[0084] To explain in more detail the order in which the socket unit 320, upper hopper 330, nozzle unit 340, and sealing member 350 are attached and detached, the nozzle unit 340, which is connected to the socket unit 320 by a male-female fastening method, can be separated downward (FIG. 18a). By separating the socket unit 320, which is connected to the first holder 310 by a male-female fastening method, downward, the upper hopper 330 can be separated together (FIG. 18b). In addition, the upper hopper 330 and sealing member 350 can be sequentially separated from the socket unit 320 (FIG. 18c).

[0085] Of course, the order is not limited to that shown in FIG. 18, and for example, the upper hopper 330 may be separated before the nozzle portion 340, or they may be separated simultaneously.

[0086] Meanwhile, reference numeral 360 denotes a first handle 360, and it is preferable that one or more handles are provided on the edge of the first holder 310, so that an operator can move the liquid injection part 300 by holding the first handle 360.

[0087] Figure 19 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, showing the state before the injection unit and pallet unit are joined together, Figure 20 is a front view of the state before the injection unit and pallet unit shown in Figure 19 are joined together, and Figure 21 is a front view of an electrolyte injection device for a secondary battery according to the present invention, showing the state after the injection unit and pallet unit are joined together.

[0088] In addition, Figure 22 is an oblique view of a needle attached to an electrolyte injection device for a secondary battery according to the present invention, Figure 23 is a cross-sectional view illustrating the connection structure between the injection part and the needle part of an electrolyte injection device for a secondary battery according to the present invention, and Figure 24 is an enlarged view of a sealing member constituting the injection part of an electrolyte injection device for a secondary battery according to the present invention.

[0089] In order to inject electrolyte into the secondary battery, the secondary battery B must be placed on the lower pallet 220, so the pallet part 200 and the injection part 300 must be spaced apart by a certain distance, and they remain spaced apart even after the secondary battery B is placed on the lower pallet 220 (see Figures 19 and 20).

[0090] When the electrolyte is poured into the secondary battery B, the first holder 310, the lower hopper 212, and the secondary battery B are in close contact with each other. Here, the nozzle part 340 is located inside the lower hopper 212 (see FIG. 21).

[0091] The needle 420, which is mounted on the second holder 410 so as to be movable up and down, includes a first body portion 421, a second body portion 422 located below the first body portion 421, and a nip portion 423 located below the second body portion 422 (see Figures 22 and 23).

[0092] The first body 421 has an open top and an open interior to allow the electrolyte to flow in, and one or more electrolyte outlet holes 421a are formed on the side. Of course, an inlet pipe (not shown) is connected to the open top of the first body 421 so that the electrolyte can be supplied to the first body 421 from the outside.

[0093] The upper side of the second body part 422 is connected to the first body part 421 , and the lower side is connected to the nip part 423 .

[0094] Meanwhile, it is preferable that the outer diameters decrease in the order of the first body portion 421, the second body portion 422, and the nip portion 423. This is to prevent the electrolyte solution from flowing back.

[0095] The sealing member 350 is located inside the socket unit 320 and is interposed between the upper hopper 330 and the nozzle unit 340. More specifically, the sealing member 350 is configured to increase the adhesive force between the second step of the socket unit and the upper hopper to prevent electrolyte leakage and ensure movement, and is a roughly cylindrical member having an electrolyte movement path 351 in the center to allow the electrolyte to pass through (see FIG. 24).

[0096] It is preferable that one or more protrusions are formed on the upper and lower surfaces of the sealing member 350. For example, a circular ring-shaped first protrusion 352 may be formed on the upper surface of the sealing member 350, more specifically, along the upper edge of the electrolyte transfer path 351. The first protrusion 352 may be used to closely contact the second body of the needle.

[0097] In addition, a circular ring-shaped second protrusion 353 may be provided at a position spaced apart from the first protrusion 352 by a certain distance. The second protrusion 353 can increase the adhesion force with the upper hopper.

[0098] In addition, a third protrusion 354 may be provided on the bottom surface of the sealing member 350, more specifically, along the lower edge of the electrolyte transfer path 351, and a fourth protrusion 355 having a circular ring shape may be provided at a position spaced apart by a predetermined distance from the third protrusion 354. The third protrusion 354 and the fourth protrusion 355 may increase the adhesive strength with the second step portion of the socket.

[0099] Here, the sealing member 350 is preferably made of a material that has a certain degree of elasticity and does not react with the electrolyte. For example, it may be made of EPDM (Ethylene Propylene Rubber) material, but is not limited thereto as long as it can achieve the same function and purpose.

[0100] FIG. 25 is a perspective view of a lift portion constituting the electrolyte injection device for a secondary battery according to the present invention, as viewed from one direction, and FIG. 26 is a perspective view of the lift portion shown in FIG. 25, as viewed from another direction.

[0101] The lift unit 500 will be described with reference to Figures 12, 13, 25, and 26. The lift unit 500 is configured to support the liquid injection unit 300 when the liquid injection unit 300 is separated. The liquid injection unit 300 is heavy because most of its components are made of metal, which can easily lead to accidents during operation or can take a long time to repair or replace parts.

[0102] However, the present invention is provided with a lift unit 500 that can be raised and lowered and that can support the liquid injection unit 300, which can contribute to improving work efficiency and preventing accidents.

[0103] In detail, the lift unit 500 can include a substantially plate-shaped underlay unit 510 , a support unit 520 , a lift unit 530 , and a second handle 540 .

[0104] The support part 520 is located on top of the underlay part 510, is movable up and down, and includes a substantially rectangular first plate 521 and a plurality of second plates 522 that extend upward from near the edge of the first plate 521 by a certain height.

[0105] Here, it is preferable that there are two or more second plates 522 positioned facing each other so as to stably support the first holder 310, and it is more preferable that the nozzle portion is at a height that does not collide with the first plate 521 when the first holder 310 is seated on the upper end of the second plate 522.

[0106] Meanwhile, it is preferable that one cutout portion 521a is formed on the edge portion of first plate 521 so that liquid injection portion 300 can be easily grasped.

[0107] The lifting unit 530 for lifting and lowering the support unit 520 may include a lifting bar 531 , a connecting bar 532 , a screw shaft 533 , an operating unit 534 , and a guide bar 535 .

[0108] The lifting bar 531 is located between the base part 510 and the support part 520 and may include a first lifting bar 531a and a second lifting bar 531b that are crossed and connected to each other by a hinge structure.

[0109] Specifically, one end of the first lifting bar 531a is connected to one side of the connecting bar 532, while the other end is in close contact with the bottom surface of the first plate 521. In addition, one end of the second lifting bar 531b is connected to the base part 510, while the other end is disposed to be in close contact with the bottom surface of the first plate 521.

[0110] For example, although FIGS. 25 and 26 show that one lifting bar 531 is provided on each of the two side edges of the underlay 510, this can be changed as many times as necessary.

[0111] The connecting bar 532 is disposed in a direction intersecting the pair of lifting bars 531, has a certain length, and has one end of the first lifting bar 531a fastened to both sides thereof.

[0112] The screw shaft 533 is disposed to intersect with the connecting bar 532 so as to guide the forward and backward movement of the connecting bar 532, and the operating part 534 which is fastened to the screw shaft 533 by a screw fastening method is located behind the connecting bar 532.

[0113] Therefore, when the operating part 534 is rotated forward or backward, the connecting bar 532 moves forward or backward, and as a result, the intersecting angle between the first lifting bar 531a and the second lifting bar 531b changes, and the support part 520 moves up and down.

[0114] Meanwhile, the guide bar 535 arranged alongside the screw shaft 533 is configured to reliably prevent distortion when the connecting bar 532 moves forward or backward, and it is preferable that a portion of the guide bar 535 is cut out so that the connecting bar 532 can be accommodated therein.

[0115] Reference numeral 540 denotes a second handle 540 that can be held by hand so that the lifting unit 500 can be easily carried, and may be provided on the base unit 510 .

[0116] Although specific portions of the contents of the present invention have been described in detail above, it will be apparent to those skilled in the art that such specific techniques are merely preferred embodiments and do not limit the scope of the present invention. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it goes without saying that such changes and modifications also fall within the scope of the accompanying claims. [Explanation of symbols]

[0117] 100 Frame section 110 Lower Plate 120 Upper Plate 130 Side Plate 140 vertical frame 200 Pallet Section 210 Upper Pallet 211 First Through Hole 212 Lower hopper 220 Lower Pallet 221 Storage groove 300 Injection section 310 First Holder 311 Second Through Hole 320 Socket part 321 Side wall 322 First step 323 Second step 324 Third step 330 Upper Hopper 340 Nozzle part 341 Slit 350 Sealing material 351 Electrolyte movement path 352 1st protrusion 353 2nd protrusion 354 Third protrusion 355 4th protrusion 360 First Handle 400 needle part 410 Second Holder 411 3rd Through Hole 420 Needle 421 1st fuselage section 421a Electrolyte Outflow Hole 422 Second fuselage section 423 Nip section 500 lift section 510 Underlay 520 Support part 521 Plate 1 521a Incision 522 Second Plate 530 Lifting section 531 Lifting bar 531a First lift bar 531b 2nd lift bar 532 Connecting bar 533 Screw shaft 534 Operation section 535 Guide Bar 540 Second Handle S1 1st space S2 2nd space S3 Third Space Division S4 Fourth Space Division B Secondary battery

Claims

1. a frame part including a lower plate and an upper plate spaced apart from the lower plate by a predetermined distance and having an opening in the center; a pallet unit detachably positioned above the lower plate and including a lower hopper to which secondary batteries and an electrolyte are supplied; a liquid injection unit located above the pallet unit and configured to supply the electrolyte to the lower hopper; a needle portion located above the upper plate for supplying the electrolyte to the injection portion, The electrolyte injection device for a secondary battery has a structure in which the injection portion and the needle portion are separable from the upper plate.

2. the liquid injection unit includes a plate-shaped first holder having a second through-hole formed therein, a socket portion accommodated in the second through-hole, an upper hopper having a lower side fastened to the socket portion and extending above the first holder, and a nozzle portion having an upper side fastened to the socket portion and extending below the first holder, The electrolyte injection device for a secondary battery according to claim 1 , wherein the needle portion includes a plate-shaped second holder having a third through-hole formed therein, and a needle accommodated in the second holder.

3. The electrolyte injection device for a secondary battery according to claim 2 , wherein the first holder and the upper plate are detachably connected to each other by a male / female screw fastening method.

4. The electrolyte injection device for a secondary battery according to claim 2 , wherein the socket portion is fixed to the second through-hole by a male / female screw fastening method.

5. The electrolyte injection device for a secondary battery according to claim 2 , wherein the upper hopper is fixed to the socket portion by a male / female screw fastening method.

6. The electrolyte injection device for a secondary battery according to claim 2 , wherein the nozzle portion is fixed to the socket portion by a male-female screw fastening method.

7. 3. The electrolyte injection device for a secondary battery according to claim 2, wherein the injection unit further includes a sealing member accommodated in the socket unit, the sealing member being interposed between the upper hopper and the nozzle unit.

8. The electrolyte injection device for a secondary battery according to claim 2 , wherein the injection section further includes a first handle for gripping the first holder.

9. 3. The electrolyte injection device for a secondary battery according to claim 2, wherein the nozzle portion has a hollow tubular shape with upper and lower open ends and an empty interior, and one or more slits formed on a side surface.

10. The electrolyte injection device for a secondary battery according to claim 9 , wherein the one or more slits are formed in a spiral shape along a side surface of the nozzle portion.

11. The electrolyte injection device for a secondary battery according to claim 2 , further comprising a lift unit for supporting and raising and lowering the injection unit.

12. 12. The electrolyte injection device for a secondary battery according to claim 11, wherein the lifting unit includes a base, a support unit that supports a bottom surface of the first holder, and an elevation unit that raises and lowers the support unit.

13. 13. The electrolyte injection device for a secondary battery according to claim 12, wherein the lifting unit includes: a lifting bar located between the base portion and the support portion, the lifting bar including a first lifting bar and a second lifting bar connected to each other by a hinge structure in a crossed state; a connecting bar fastened to one end of the first lifting bar; a screw shaft extending to a certain length to guide the forward and backward movement of the connecting bar; and an operating unit for moving the connecting bar forward or backward.

14. The electrolyte injection device for a secondary battery according to claim 13 , wherein the lifting unit further comprises a guide bar for guiding the connecting bar forward or backward.

15. The electrolyte injection device for a secondary battery according to claim 13 , wherein the lifting portion further includes a second handle for gripping the base portion.

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