Apparatus for injecting electrolyte of secondary battery

Abstract

The present invention relates to an apparatus for injecting an electrolyte of a secondary battery and, more particularly, to an apparatus for injecting an electrolyte of a secondary battery, the apparatus comprising: a frame unit including a lower plate and an upper plate that is spaced a certain distance from the lower plate and has an opening in the center; a pallet unit detachably located above the lower plate and provided with a lower hopper that is supplied with the secondary battery and the electrolyte; a liquid injection unit, located above the pallet unit, for supplying the electrolyte to the lower hopper; and a needle unit, located above the upper plate, for supplying the electrolyte to the liquid injection unit. The liquid injection unit and the needle unit have a structure that can be separated from the upper plate.

Description

Electrolyte injection device for secondary batteries

[0001] This application claims the benefit of priority to Korean Patent Application No. 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 specifically, to an electrolyte injection device having a structure that facilitates replacement or maintenance of the injection part.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] Meanwhile, when manufacturing a cylindrical battery, an electrolyte injection process is required in which the electrolyte is injected into the case in which the electrode assembly is built so that the electrode assembly is sufficiently submerged, and then left for a certain period of time so that the electrolyte can fill the microscopic pores inside the electrode assembly.

[0007] In this regard, Fig. 1 is a conceptual diagram of an electrolyte supply device according to the prior art, and Fig. 2 is an enlarged drawing of a portion of an electrolyte supply device according to the prior art.

[0008] As shown in Fig. 1, a conventional electrolyte supply device is disclosed, which includes a base nozzle member (10) having a plurality of nozzle members (11), a plunger member (20) for opening and closing a discharge port (11a), a plunger fixing plate member (30), an elevating and lowering means (40) for elevating or lowering the plunger fixing plate member (30), a plate guide member (50) for guiding the operation of the elevating and lowering means (40), a housing member (60), and a vacuum pump (70).

[0009] In this conventional electrolyte supply device, the nozzle part (11) is provided with a supply chamber (12) for receiving the electrolyte, and a discharge port (11a) for discharging 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).

[0010] Also, as shown in FIG. 2, the plunger member (20) is provided with an opening / closing portion (21) that is inserted into an opening / closing groove (11b) at the end to block the discharge port (11a), and an O-ring (21a) that is in close contact with the inner surface of the opening / closing groove (11b) is coupled to the opening / closing portion (21). Therefore, when the plunger member (20) is lowered and inserted into the opening / closing groove (11b), the O-ring (21a) is in close contact with the inner surface of the opening / closing groove (11b) and seals, thereby blocking the discharge port (11a) and sealing the inside of the supply chamber (12).

[0011] Since the electrolyte injection process is an essential process for manufacturing secondary batteries, the above process must be repeated countless times, and therefore, various parts must be replaced or maintained.

[0012] However, in the conventional electrolyte supply device, the case jig member (61) including each storage case member (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).

[0013]

[0014] (Prior art literature)

[0015] (Patent Document 1) Korean Patent Publication No. 2009-0036793

[0016] (Patent Document 2) Korean Patent Publication No. 1876834

[0017]

[0018] In order to solve the above problems, the present invention aims to provide an electrolyte injection device for a secondary battery having a structure in which an injection unit for supplying electrolyte can be easily removed.

[0019] In addition, the present invention aims to provide an electrolyte injection device for a secondary battery having a structure in which each unit component constituting the injection unit can be easily attached and detached.

[0020] In addition, the present invention aims to provide an electrolyte injection device for a secondary battery that can perform work quickly and stably when attaching and detaching the injection part.

[0021]

[0022] In order to solve the above problems, the electrolyte injection device of the secondary battery according to the present invention comprises a frame part (100) including a lower plate (110) and an upper plate (120) spaced apart from the lower plate (110) by a certain distance and having an open center; a pallet part (200) detachably positioned on the upper part of the lower plate (110) and having a lower hopper (212) for supplying a secondary battery (B) and an electrolyte; a injection part (300) positioned on the upper part of the pallet part (200) for supplying an electrolyte to the lower hopper (212); and a needle part (400) positioned on the upper plate (120) for supplying an electrolyte to the injection part (300); wherein the injection part (300) and the needle part (400) are characterized in that they have a structure that is detachable from the upper plate (120).

[0023] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the injection part (300) is characterized by including a plate-shaped first holder (310) in which a second through-hole (311) is formed, a socket part (320) accommodated in the second through-hole (311), an upper hopper (330) extending upwardly from the first holder (310) while its lower side is connected to the socket part (320), and a nozzle part (340) extending downwardly from the first holder (310) while its upper side is connected to the socket part (320), and the needle part (400) includes a plate-shaped second holder (410) in which a third through-hole (411) is formed, and a needle (420) accommodated in the second holder (410).

[0024] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the first holder (310) and the upper plate (120) are characterized in that they are detachably connected by a male-female screw fastening method.

[0025] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the socket part (320) is characterized in that it is fixed to the second through hole (311) using a male and female screw fastening method.

[0026] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the upper hopper (330) is characterized in that it is fixed to the socket part (320) using a male and female screw fastening method.

[0027] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the nozzle part (340) is characterized in that it is fixed to the socket part (320) using a male and female screw fastening method.

[0028] In addition, in the electrolyte injection device of the 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 characterized in that it is interposed between the upper hopper (330) and the nozzle unit (340).

[0029] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the injection unit (300) is characterized in that it further includes a first handle (360) for holding the first holder (310).

[0030] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the nozzle part (340) is characterized by having a hollow tube shape with open upper and lower parts and an empty interior, and having one or more slits (341) formed on the side.

[0031] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the one or more slits (341) are characterized by being formed in a spiral shape along the side of the nozzle portion (340).

[0032] In addition, the electrolyte injection device of the secondary battery according to the present invention is characterized by further including a lift part (500) for supporting and elevating the injection part (300).

[0033] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the lift part (500) is characterized by including a support part (510), a support part (520) that supports the bottom surface of the first holder (310), and an elevating part (530) for elevating the support part (520).

[0034] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the lifting unit (530) is characterized by including a lifting bar (531) including a first lifting bar (531a) and a second lifting bar (531b) which are positioned between the support unit (510) and the cradle unit (520) and are connected to each other in a hinge structure while intersecting each other, a connecting bar (532) connected to one end of the first lifting bar (531a), a screw shaft (533) extended by a predetermined length so as to guide forward and backward movement of the connecting bar (532), and an operating unit (534) for moving the connecting bar (532) forward or backward.

[0035] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the lifting unit (530) is characterized in that it further includes a guide bar (535) for guiding the connecting bar (532) forward or backward.

[0036] In addition, in the electrolyte injection device of the secondary battery according to the present invention, the lift part (500) is characterized in that it further includes a second handle (540) for holding the support part (510).

[0037]

[0038] According to the electrolyte injection device of the secondary battery of the present invention, the injection part is located under the lower plate and is detachably fixed to the lower plate, so there is an advantage in that inspection and maintenance are very easy.

[0039] In addition, according to the electrolyte injection device of the 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 by a male and female screw fastening method, so that not only is it easy to replace each part, but work time can be reduced, which is advantageous.

[0040] In addition, the electrolyte injection device of the secondary battery of the present invention additionally includes a lift for removing or installing the injection part, so that not only can the risk of accidents during work be reduced, but the time required for detachment and installation can be reduced, which is an advantage.

[0041]

[0042] Figure 1 is a conceptual diagram of an electrolyte supply device according to conventional technology.

[0043] Figure 2 is an enlarged view of a portion of an electrolyte supply device according to the prior art.

[0044] Figure 3 is a perspective view of a secondary battery electrolyte injection device according to the present invention, in which the injection unit and the needle unit are combined and a lift unit is mounted below the injection unit.

[0045] Fig. 4 is a perspective view of the electrolyte injection device of the secondary battery illustrated in Fig. 3 viewed from another direction.

[0046] Fig. 5 is a perspective view showing the internal appearance of the electrolyte injection device of the secondary battery illustrated in Fig. 3.

[0047] Figure 6 is a front view of the electrolyte injection device of the secondary battery illustrated in Figure 5.

[0048] Figure 7 is a perspective view of a pallet portion mounted on an electrolyte injection device of a secondary battery according to the present invention.

[0049] Figure 8 is a front view of the pallet section shown in Figure 7.

[0050] Figure 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 mounted below the injection part.

[0051] Fig. 10 is a front view of the electrolyte injection device of the secondary battery illustrated in Fig. 9.

[0052] Fig. 11 is a perspective view showing the inside of the electrolyte injection device of the secondary battery illustrated in Fig. 9.

[0053] Figure 12 is a perspective view of the electrolyte injection unit of the secondary battery according to the present invention, which is mounted on the lift unit.

[0054] Figure 13 is a front view of the liquid part shown in Figure 12 mounted on the lift part.

[0055] Figure 14 is a perspective view of a liquid injection unit constituting an electrolyte injection device of a secondary battery according to the present invention.

[0056] Fig. 15 is a front view of the injection part shown in Fig. 14.

[0057] Figure 16 is an enlarged cross-sectional view of part 'A' of Figure 15.

[0058] Figure 17 is an exploded perspective view of part 'A' of Figure 15.

[0059] Figure 18 is a cross-sectional view illustrating the decomposition process of each component forming the liquid injection unit in the electrolyte injection device of a secondary battery according to the present invention.

[0060] Figure 19 is a perspective view of the electrolyte injection device of a secondary battery according to the present invention, in a state before the injection part and the pallet part are combined.

[0061] Figure 20 is a front view of the state before the main body and the pallet body are combined as shown in Figure 19.

[0062] Figure 21 is a front view of the combined state of the injection unit and the pallet unit in the electrolyte injection device of the secondary battery according to the present invention.

[0063] Figure 22 is a perspective view of a needle mounted on an electrolyte injection device of a secondary battery according to the present invention.

[0064] Figure 23 is a cross-sectional view for explaining the joint structure of the injection part and the needle part in the electrolyte injection device of a secondary battery according to the present invention.

[0065] Figure 24 is an enlarged view of a sealing member constituting a liquid injection unit in an electrolyte injection device of a secondary battery according to the present invention.

[0066] Figure 25 is a perspective view of a lift unit constituting an electrolyte injection device of a secondary battery according to the present invention, viewed from one side.

[0067] Fig. 26 is a perspective view of the lift unit shown in Fig. 25 as viewed from the other side.

[0068]

[0069] In this application, the terms “includes,” “has,” or “comprises” are intended to specify the presence of a feature, number, step, component, part, or combination thereof described in the specification, but should be understood not to preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0070] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0071]

[0072] Hereinafter, the electrolyte injection device of the secondary battery according to the present invention will be described with reference to the attached drawings.

[0073] FIG. 3 is a perspective view of an electrolyte injection device for a secondary battery according to the present invention, in which an injection unit and a needle unit are combined and a lift unit is mounted below the injection unit; FIG. 4 is a perspective view of the electrolyte injection device for a secondary battery shown in FIG. 3 as viewed from another direction; FIG. 5 is a perspective view showing the internal appearance of the electrolyte injection device for a secondary battery shown in FIG. 3; and FIG. 6 is a front view of the electrolyte injection device for a secondary battery shown in FIG. 5.

[0074] Also, FIG. 7 is a perspective view of a pallet part mounted on an electrolyte injection device of a secondary battery according to the present invention, and FIG. 8 is a front view of the pallet part shown in FIG. 7.

[0075] Also, FIG. 9 is a perspective view of the electrolyte injection device of the secondary battery according to the present invention, in which the injection part and the needle part are separated and a lift part is mounted under the injection part, FIG. 10 is a front view of the electrolyte injection device of the secondary battery illustrated in FIG. 9, and FIG. 11 is a perspective view showing the inside of the electrolyte injection device of the secondary battery illustrated in FIG. 9.

[0076] Also, FIG. 12 is a perspective view showing the electrolyte injection unit of the secondary battery according to the present invention mounted on the lift unit, and FIG. 13 is a front view showing the electrolyte injection unit shown in FIG. 12 mounted on the lift unit.

[0077] The electrolyte injection device of a secondary battery according to the present invention may be configured to include a frame portion (100), a pallet portion (200), an injection portion (300), and a needle portion (400), and may further include a lift portion (500) if necessary.

[0078] First, the frame part (100) is configured to support the pallet part (200), the injection part (300), and the needle part (400), and may be configured to include a lower plate (110), an upper plate (120), a side plate (130), and a vertical frame (140).

[0079] The lower plate (110) is configured to selectively support the pallet section (200) or the lift section (500).

[0080] The upper plate (120) is positioned above the lower plate (110), has an open center so that the upper hopper (330) constituting the injection unit (300) can protrude upward, and the injection unit (300) is fixed to the upper plate (120) in a detachable structure.

[0081] For example, the upper plate (120) and the main body (300) may be fixed using a male and female screw fastening method such as a bolt and nut, but are not necessarily limited thereto.

[0082] The side plate (130) extends downward along the edge of the upper plate (120) to form a sealed space, and the vertical frame (140) is connected to the needle portion (400) located on the upper side of the upper plate (120). Of course, it is also preferable that the needle portion (400) be connected to the frame portion (100) in a detachable structure.

[0083] Although not shown in the drawing, a support frame (not shown) may be connected to the side plate (130) to space it apart from the ground by a certain height, and the outer shape of the support frame (not shown) is not particularly limited.

[0084]

[0085] In FIGS. 3 to 6, the lower part of the lift part (500) is placed on the upper surface of the lower plate (110) having a roughly square shape, and the upper part of the lift part (500) is in close contact with the lower surface of the injection part (300). However, when injecting electrolyte into the secondary battery, the pallet part (200) having a structure as shown in FIGS. 7 and 8 is in close contact with the upper surface of the lower plate (110) and the lower surface of the injection part (300).

[0086] In detail, when pouring electrolyte into a secondary battery, the pallet portion (200) including the lower pallet (220) in which the secondary battery (B) is stored is in close contact with the bottom surface of the pouring portion (300) so that the electrolyte can be supplied to the secondary battery (B).

[0087] At this time, the pallet section (200) is mounted on the upper surface of the lower plate (110), and the lower plate (110) is structured to be raised and lowered by a separate lifting member (not shown).

[0088] Therefore, before the electrolyte is poured or after the electrolyte is poured, the position of the pallet part (200) changes due to the elevation of the lower plate (110).

[0089] Meanwhile, since the electrolyte is repeatedly injected over a long period of time, maintenance such as inspection and parts replacement is required.

[0090] As shown in FIGS. 9 to 12, when inspection, replacement, or maintenance of each component constituting the injection unit (300) is required, the injection unit (300) is moved downward by mounting a lift unit (500) on the upper surface of the lower plate (110) to support the injection unit (300). A detailed description of the injection unit (300) and the lift unit (500) will be provided later.

[0091] Referring again to FIGS. 7 and 8, the pallet section (200) may be composed of an upper pallet (210) and a lower pallet (220) that are separable from each other and have an adjustable vertical separation distance.

[0092] The upper pallet (210) is provided with a plurality of first through holes (211), and each of the first through holes (211) houses a lower hopper (212) having a roughly cylindrical shape with an open upper and lower portion and an empty interior.

[0093] This lower hopper (212) is configured to guide the electrolyte supplied from the main body (300) to the secondary battery (B).

[0094] A plurality of storage grooves (221) are formed in the lower pallet (220) so that a secondary battery (B) requiring an electrolyte solution can be stored.

[0095] Here, the upper part of the secondary battery (B) is open so that the electrolyte can flow in, and it is preferable that the number of lower hoppers (212) be the same and that they are positioned on the same vertical extension line.

[0096] Referring again to FIGS. 3 to 6 and 9 to 11, the needle portion (400) is positioned above the injection portion (300) and is configured to supply electrolyte to the injection portion (300). Specifically, the needle portion (400) includes a plate-shaped second holder (410) provided with a plurality of third through holes (411), and a needle (420) for supplying electrolyte to the upper hopper (330) while 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.

[0097] Meanwhile, the secondary battery (B) is a cylindrical secondary battery or a square secondary battery before the cap assembly is installed. Typically, a cylindrical secondary battery is obtained by placing a separator between long sheet-shaped positive and negative electrodes, then wrapping the jelly-roll-shaped electrode assembly in a battery case, pouring an electrolyte, and then installing and fixing the cap assembly.

[0098] In the secondary battery (B) of the present invention, the electrode assembly is housed in a battery case, the upper part of the battery case is open, and the electrode assembly corresponds to a known technical configuration, so a detailed description thereof will be omitted.

[0099] Fig. 14 is a perspective view of a liquid injection unit constituting an electrolyte injection device of a secondary battery according to the present invention, and Fig. 15 is a front view of the liquid injection unit illustrated in Fig. 14. In addition, Fig. 16 is an enlarged cross-sectional view of part 'A' of Fig. 15, Fig. 17 is an exploded perspective view of part 'A' of Fig. 15, and Fig. 18 is a cross-sectional view explaining the disassembly process of each component constituting the liquid injection unit in the electrolyte injection device of a secondary battery according to the present invention.

[0100] The injection part (300) is configured to supply electrolyte to the lower hopper (212) by being located above the pallet part (200), and may include a first holder (310), a socket part (320), an upper hopper (330), a nozzle part (340), a sealing member (350), and a first handle (360).

[0101] First, the first holder (310) has a substantially flat plate shape and a plurality of second through holes (311) are formed therein.

[0102] The socket part (320) is mounted in the second through hole (311) and is configured to fix the upper hopper (330), nozzle part (340), and sealing member (350).

[0103] Referring to FIGS. 16 to 18, more specifically, the socket portion (320) is surrounded by a side wall (321) so that a space portion can be provided inside while the upper and lower portions are open, and the horizontal cross-section can be circular.

[0104] Here, the internal space of the socket portion (320) may be composed of a first space portion (S1) located at the top, a second space portion (S2) located below the first space portion (S1), a third space portion (S3) located below the second space portion (S2), and a fourth space portion (S4) located below the third space portion (S3), and at this time, the inner diameter decreases in the order of the first space portion (S1), the second space portion (S2), the fourth space portion (S4), and the third space portion (S3).

[0105] In addition, in order to allow the inner diameter of each space to be different, a first step (322), a second step (323), and a third step (324) are provided at the boundary points between the first space (S1) and the second space (S2), the boundary points between the second space (S2) and the third space (S3), and the boundary points between the third space (S3) and the fourth space (S4), respectively.

[0106] Accordingly, the lower part of the upper hopper (330) is extended upwardly while being coupled to the first space (S1) of the socket part (320), and the upper part of the nozzle part (340) is extended downwardly while being coupled to the third space (S3) and the fourth space (S4) of the socket part (320). The sealing member (350) is structured to be interposed between the lower part of the upper hopper (330) and the upper part of the nozzle part (340), i.e., the second space (S2).

[0107] The upper hopper (330), which is fixed to the socket part (320) at the lower side and extends upward by a predetermined length, temporarily receives the electrolyte supplied from the needle part (400), and has a roughly cylindrical shape with the upper and lower sides open.

[0108] The nozzle part (340), which is fixed to the socket part (320) at the upper side and extends downwards by a predetermined length, is a hollow tube shape with open upper and lower sides and an empty interior, and is located inside the lower hopper (212) when the electrolyte is injected.

[0109] Here, it is preferable that the nozzle portion (340) is provided with one or more slits (341) on the side, and it is more preferable that the one or more slits (341) are formed in a spiral shape along the side.

[0110] The electrolyte supplied to the secondary battery stored in the lower pallet must always be supplied in a constant amount. However, if the supplied electrolyte flies and gets on the inner wall of the lower hopper or leaks to the outside, a deviation in the supplied amount may occur, which may lead to defects.

[0111] For example, in addition to a certain amount of electrolyte, air is mixed in the upper portion of the electrolyte in the upper hopper (330). However, since the electrolyte supply process is carried out under reduced pressure conditions, air is continuously sucked in when the electrolyte filled in the upper hopper (330) moves to the lower hopper.

[0112] This air strikes the electrolyte in the lower hopper, causing it to scatter and adhere to the inner walls of the lower hopper. Consequently, the electrolyte that should be injected into the secondary battery may be insufficient, or conversely, the amount of electrolyte injected into some secondary batteries may increase due to the electrolyte that has accumulated on the inner walls.

[0113] However, when one or more slits (341) are provided on the side, the air sucked in after the electrolyte is transferred is dispersed through the lower opening of the nozzle part (340) and the slits (341) on the side, so that the electrolyte can be minimized from flying away.

[0114] Meanwhile, it is preferable that at least one of the socket part (320), upper hopper (330) and nozzle part (340) has a detachable structure, and it is more preferable that all of them have a detachable structure.

[0115] As mentioned above, the electrolyte injection device requires maintenance, inspection, or replacement of parts during use.

[0116] Therefore, if a female screw thread is provided on the inner surface of the second through hole (311) and a male screw thread is provided on the outer surface of the side wall (321) of the socket part (320), attachment and detachment of the socket part (320) is very easy.

[0117] In addition, if a female screw thread is provided on the inner surface of the side wall (321) corresponding to the first space (S1) of the socket portion (320) and a male screw thread is provided on the outer surface of the lower side of the upper hopper (330), the attachment and detachment of the upper hopper (330) is very easy.

[0118] In addition, if a female screw thread is provided on the inner surface of the side wall (321) corresponding to the third space (S3) of the socket part (320) and a male screw thread is provided on the upper outer surface of the nozzle part (340), the nozzle part (340) can be very easily attached and detached. Of course, a female screw thread may also be provided on the fourth space (S4) of the socket part (320), and in this case, a male screw thread is also provided on the nozzle part (340).

[0119] Meanwhile, the inner surface of the side wall (321) corresponding to the second space (S2) of the socket portion (320) does not need to have a female screw thread, because the second space (S2) is where the sealing member (350) made of elastic material is located, and the sealing member (350) can be replaced by separating the upper hopper (330).

[0120] More specifically, the order of attachment and detachment of the socket part (320), upper hopper (330), nozzle part (340), and sealing member (350) can be described. The nozzle part (340), which was connected to the socket part (320) in a male-female manner, can be separated downward (Fig. 18a). By separating downward the socket part (320), which was connected to the first holder (310) in a male-female manner, the upper hopper (330) can be separated together (Fig. 18b). In addition, the upper hopper (330) and the sealing member (350) can be sequentially separated from the socket part (320) (Fig. 18c).

[0121] Of course, it is not limited to the order shown in Fig. 18, and for example, the upper hopper (330) may be separated before the nozzle section (340), and it is also possible to separate them at the same time.

[0122] Meanwhile, drawing symbol 360 is a first handle (360), and it is preferable that at least one of them is provided at the edge of the first holder (310), and the worker can move the injection part (300) by holding the first handle (360).

[0123]

[0124] Fig. 19 is a perspective view of the electrolyte injection device of a secondary battery according to the present invention in a state before the injection part and the pallet part are combined, Fig. 20 is a front view of the electrolyte injection device of the secondary battery according to the present invention in a state before the injection part and the pallet part are combined, and Fig. 21 is a front view of the electrolyte injection device of the secondary battery according to the present invention in a state before the injection part and the pallet part are combined.

[0125] Also, FIG. 22 is a perspective view of a needle mounted in an electrolyte injection device of a secondary battery according to the present invention, FIG. 23 is a cross-sectional view for explaining the joint structure of an injection portion and a needle portion in an electrolyte injection device of a secondary battery according to the present invention, and FIG. 24 is an enlarged view of a sealing member constituting an injection portion in an electrolyte injection device of a secondary battery according to the present invention.

[0126] In order to inject electrolyte into a secondary battery, the secondary battery (B) must be stored in the lower pallet (220), so the pallet section (200) and the liquid injection section (300) must be spaced apart by a certain distance, and even after the secondary battery (B) is stored in the lower pallet (220), the separation is maintained (see FIGS. 19 and 20).

[0127] When injecting electrolyte into the secondary battery (B), the first holder (310), the lower hopper (212) and the secondary battery (B) are in close contact, and at this time, the nozzle part (340) is located inside the lower hopper (212) (see FIG. 21).

[0128] A needle (420) mounted so as to be liftable on a second holder (410) is configured to include a first body part (421), a second body part (422) positioned below the first body part (421), and a nip part (423) positioned below the second body part (422) (see FIGS. 22 and 23).

[0129] The first body part (421) is hollow inside with an open top to allow electrolyte to flow in, and one or more electrolyte discharge holes (421a) are formed on the side. Of course, a liquid supply pipe (not shown) is connected to the open top of the first body part (421), so that electrolyte can be supplied to the first body part (421) from the outside.

[0130] The upper part of the second body part (422) is connected to the first body part (421), and the lower part is connected to the nip part (423).

[0131] Meanwhile, it is preferable that the outer diameter becomes smaller in the order of the first body part (421), the second body part (422), and the nip part (423), to prevent the introduced electrolyte from flowing back.

[0132] The sealing member (350) is positioned inside the socket portion (320) and interposed between the upper hopper (330) and the nozzle portion (340). To be more specific, the sealing member (350) is configured to increase the adhesion between the second step portion of the socket portion and the upper hopper, thereby preventing leakage of the electrolyte and ensuring movement. It has a roughly cylindrical shape with an electrolyte passage (351) provided in the center to allow the electrolyte to pass through (see Fig. 24).

[0133] It is preferable that one or more protrusions be formed on the upper and lower surfaces of the sealing member (350). For example, a first protrusion (352) in the shape of a circular ring may be provided on the upper surface of the sealing member (350), more specifically, along the upper edge of the electrolyte movement path (351), and the second body part of the needle can be brought into close contact with this first protrusion (352).

[0134] In addition, a second protrusion (353) in the shape of a circular ring may be provided at a position spaced apart from the first protrusion (352), and the adhesion with the upper hopper can be increased through this second protrusion (353).

[0135] In addition, the sealing member (350) may be provided with a third protrusion (354) along the lower edge of the electrolyte passage (351), and a fourth protrusion (355) in the shape of a circular ring may be provided at a position spaced apart from the third protrusion (354). Through the third protrusion (354) and the fourth protrusion (355), the sealing force with the second step of the socket part can be increased.

[0136] Here, the sealing member (350) is preferably a material that has a certain elasticity and does not react with the electrolyte, and may be, for example, an EPDM (Ethylene Propylene Rubber) material, but is not limited thereto as long as it can achieve the same function and purpose.

[0137]

[0138] Fig. 25 is a perspective view of a lift unit constituting an electrolyte injection device of a secondary battery according to the present invention viewed from one side, and Fig. 26 is a perspective view of the lift unit illustrated in Fig. 25 viewed from the other side.

[0139] The lift unit (500) will be described with reference to FIGS. 12, 13, 25, and 26. The lift unit (500) is configured to support the injection unit (300) when the injection unit (300) is removed. The injection unit (300) is heavy because most of its parts are made of metal, and thus, accidents may easily occur during operation or maintenance or replacement of parts may take a lot of time.

[0140] However, the present invention is provided with a lift part (500) that can be raised and lowered to support the injection part (300), which can contribute to improving work efficiency and preventing accidents.

[0141] In detail, the lift part (500) may be configured to include a roughly plate-shaped support part (510), a support part (520), an elevating part (530), and a second handle (540).

[0142] The support member (520) is positioned above the base member (510) and can move up and down, and is configured to include a first plate (521) having a roughly square shape, and a plurality of second plates (522) extending upward at a certain height from near the edge of the first plate (521).

[0143] Here, it is preferable that the second plates (522) are 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 secured to the upper end of the second plate (522).

[0144] Meanwhile, it is preferable that one cut portion (521a) be formed on the edge of the first plate (521) to facilitate the removal of the main body (300).

[0145] The lifting unit (530) for lifting 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).

[0146] The lifting bar (531) is located between the support member (510) and the supporting member (520), and may include a first lifting bar (531a) and a second lifting bar (531b) that are connected to each other in a hinge structure while intersecting each other.

[0147] In detail, one end of the first lifting bar (531a) is connected to one end 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 support (510), while the other end is arranged to be in close contact with the bottom surface of the first plate (521).

[0148] Although FIGS. 25 and 26 illustrate that there is one lifting bar (531) on each of the two edges of the support member (510), this can be changed at any time.

[0149] The connecting bar (532) is arranged in a direction intersecting with a pair of lifting bars (531) and has a certain length, and one end of the first lifting bar (531a) is connected to both sides.

[0150] The screw shaft (533) is arranged 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) that is connected to the screw shaft (533) by a screw connection method is located at the rear of the connecting bar (532).

[0151] Accordingly, when the operating unit (534) is rotated forward or backward, the connecting bar (532) moves forward or backward, and as a result, the intersection angle of the first lifting bar (531a) and the second lifting bar (531b) changes, causing the support unit (520) to rise and fall.

[0152] Meanwhile, the guide bar (535) arranged parallel to the screw shaft (533) is configured to reliably prevent the connecting bar (532) from twisting when moving forward or backward, and it is preferable that a portion of the guide bar (535) be cut so that the connecting bar (532) can be stored therein.

[0153] Drawing symbol 540 is a second handle (540) that can be held by hand to facilitate transport of the lift unit (500), and can be provided on the support unit (510).

[0154]

[0155] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. 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 is natural that such changes and modifications fall within the scope of the appended patent claims.

[0156] (Explanation of symbols)

[0157] 100: Frame section

[0158] 110: Lower plate 120: Upper plate

[0159] 130: Side plate 140: Vertical frame

[0160] 200: Pallet section

[0161] 210: Upper pallet

[0162] 211: First through hole 212: Lower hopper

[0163] 220: Lower pallet 221: Storage groove

[0164] 300: Main body

[0165] 310: First holder 311: Second through hole

[0166] 320: Socket section

[0167] 321: Side wall 322: First step

[0168] 323: Second step 324: Third step

[0169] 330: Upper hopper

[0170] 340: Nozzle 341: Slit

[0171] 350: Sealing member

[0172] 351: Electrolyte transfer path 352: First protrusion

[0173] 353: Second protrusion 354: Third protrusion

[0174] 355: 4th protrusion

[0175] 360: 1st handle

[0176] 400: Needle

[0177] 410: Second holder 411: Third through hole

[0178] 420: Needle

[0179] 421: First body part 421a: Electrolyte discharge hole

[0180] 422: Second body part 423: Nib part

[0181] 500: Lift section

[0182] 510: Support

[0183] 520: Support

[0184] 521: First plate 521a: Incision

[0185] 522: Second Plate

[0186] 530: Elevator

[0187] 531: Elevator bar

[0188] 531a: First lifting bar 531b: Second lifting bar

[0189] 532: Connecting bar

[0190] 533: Screw shaft 534: Control unit

[0191] 535: Guide bar

[0192] 540: Second handle

[0193] S1: First space S2: Second space

[0194] S3: Third space S4: Fourth space

[0195] B: Secondary battery

Claims

1. A frame portion including a lower plate and an upper plate spaced apart from the lower plate by a certain distance and having an open center; A pallet section having a lower hopper that is detachably positioned on the upper part of the lower plate and into which a secondary battery and electrolyte are supplied; A liquid injection unit located on the upper part of the above pallet section and for supplying electrolyte to the lower hopper; and A needle part located on the upper part of the upper plate and for supplying electrolyte to the main part; An electrolyte injection device for a secondary battery, characterized in that the injection part and the needle part are structures that can be separated from the upper plate.

2. In paragraph 1, The above-mentioned injection part includes a plate-shaped first holder having a second through-hole formed therein, a socket part accommodated in the second through-hole, an upper hopper having a lower side connected to the socket part and extending upwardly from the first holder, and a nozzle part having an upper side connected to the socket part and extending downwardly from the first holder. An electrolyte injection device for a secondary battery, characterized in that the needle part includes a plate-shaped second holder having a third through hole formed therein, and a needle accommodated in the second holder.

3. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the first holder and the upper plate are detachably connected by a male-female screw fastening method.

4. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the socket part is fixed to the second through hole using a male-female screw fastening method.

5. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the upper hopper is fixed to the socket section using a male-female screw connection method.

6. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the nozzle portion is fixed to the socket portion using a male-female screw connection method.

7. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the injection part further includes a sealing member accommodated in the socket part, wherein the sealing member is interposed between the upper hopper and the nozzle part.

8. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the injection part further includes a first handle for holding the first holder.

9. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that the nozzle part is a hollow tube shape with open upper and lower parts and an empty interior, and has one or more slits formed on the side.

10. In paragraph 9, An electrolyte injection device for a secondary battery, characterized in that the one or more slits are formed in a spiral shape along a side of the nozzle portion.

11. In paragraph 2, An electrolyte injection device for a secondary battery, characterized in that it further includes a lift part for raising and lowering the injection part while supporting the injection part.

12. In paragraph 11, An electrolyte injection device for a secondary battery, characterized in that the lift part includes a support part, a support part that supports the bottom surface of the first holder, and a lifting part for lifting the support part.

13. In paragraph 12, A secondary battery electrolyte injection device characterized in that the above-mentioned lifting unit includes a lifting bar including a first lifting bar and a second lifting bar which are positioned between the support and the pedestal and are connected to each other in a hinge structure while intersecting each other, a connecting bar connected to one end of the first lifting bar, a screw shaft extended by a predetermined length so as to guide forward and backward movement of the connecting bar, and an operating unit for moving the connecting bar forward or backward.

14. In paragraph 13, An electrolyte injection device for a secondary battery, characterized in that the lifting unit further includes a guide bar for guiding the connecting bar forward or backward.

15. In paragraph 13, An electrolyte injection device for a secondary battery, characterized in that the lifting part further includes a second handle for holding the support part.

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