Electrolyte supply device for secondary batteries

Abstract

The present invention relates to an electrolyte supply device for a secondary battery, and more particularly to an electrolyte supply device for a secondary battery, characterized by comprising: an upper hopper section having a first storage space formed for temporarily storing the supplied electrolyte and a flow path on its lower side; a lower hopper section having a second storage space formed for guiding the electrolyte transferred from the upper hopper section to the secondary battery; a needle section that opens or closes the flow path while moving up and down while being housed in the first storage space; and a nozzle section housed inside the lower hopper section and coupled to communicate with the flow path.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0129866 filed on September 26, 2023, and all the contents disclosed in the Korean patent application are included as part of this specification.

[0002] The present invention relates to an electrolyte supply device for a secondary battery, and more particularly, to an electrolyte supply device for a secondary battery that can reduce the injection amount deviation of the electrolyte and further minimize the inflow of foreign substances.

Background Art

[0003] As the development and demand for technologies for mobile devices increase, 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, hybrid electric vehicles, etc., which are presented as alternatives to existing gasoline vehicles and diesel vehicles that use fossil fuels.

[0004] Secondary batteries are classified into cylindrical batteries and prismatic batteries in which the electrode assembly is built into a cylindrical or rectangular metal can according to the shape of the battery case, and pouch-type batteries in which the electrode assembly is built into a pouch-type case made of an aluminum laminate sheet.

[0005] On the other hand, in the manufacture of cylindrical batteries, after injecting an electrolyte so that the electrode assembly is fully immersed in the case in which the electrode assembly is built, it is left for a certain period of time so that the electrolyte fills the fine voids inside the electrode assembly. An electrolyte injection process is required.

[0006] 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 view of a part of the electrolyte supply device according to the prior art.

[0007] As shown in Figure 1, a conventional electrolyte supply device includes a base nozzle member 10 having a number of nozzle sections 11, a plunger member 20 that opens and closes the discharge port 11a, a plunger fixing plate member 30, a lifting means 40 that raises and lowers the plunger fixing plate member 30, and a plate guide section 50 that guides the operation of the lifting means 40.

[0008] In such a conventional electrolyte supply device, the nozzle section 11 is equipped with a supply chamber 12 for receiving the electrolyte, and a discharge port 11a for discharging the electrolyte is formed at the bottom, thereby injecting the electrolyte from the supply chamber 12 into the battery case 5.

[0009] Furthermore, as shown in Figure 2, the plunger member 20 is equipped with an opening / closing portion 21 at its end that is inserted into the opening / closing groove 11b and closes the discharge port 11a, and an O-ring 21a is attached to the opening / closing portion 21 that is in close contact with the inner circumferential surface of the opening / closing groove 11b. Therefore, when the plunger member 20 descends and is inserted into the opening / closing groove 11b, the O-ring 21a seals the discharge port 11a by being in close contact with the inner circumferential surface of the opening / closing groove 11b, thereby sealing the inside of the supply chamber 12.

[0010] The electrolyte injection process is an essential step in manufacturing secondary batteries, and therefore the aforementioned process must be repeated countless times, resulting in continuous friction that wears down the O-rings. In particular, prolonged exposure to the electrolyte can cause the O-rings to swell, which leads to increased friction and accelerated wear.

[0011] Ultimately, wear on the O-ring can not only prevent the correct amount of electrolyte from being injected into the battery case, but it can also cause foreign matter generated during the wear process to flow into the battery case along with the electrolyte, leading to a higher failure rate and potentially posing a significant threat to safety.

[0012] Meanwhile, the storage case member stores the electrolyte that is discharged through the discharge port 11a. Since the supply chamber 12 contains not only the electrolyte but also air mixed in with the electrolyte, the air also flows into the storage case member through the discharge port 11a.

[0013] In this case, the incoming air strikes the electrolyte stored in the storage case member, causing it to scatter. The scattered electrolyte may then adhere to the inner wall of the storage case member or leak out, which can cause the amount of electrolyte injected to be inconsistent. [Prior art documents] [Patent Documents]

[0014] [Patent Document 1] Korean Patent Application Publication No. 10-2009-0036793 Specification [Patent Document 2] Korean Patent No. 10-1876834 Specification [Overview of the project] [Problems that the invention aims to solve]

[0015] The present invention aims to provide an electrolyte supply device for a secondary battery that can stably supply electrolyte, in order to solve the aforementioned problems.

[0016] Furthermore, the present invention aims to provide an electrolyte supply device for a secondary battery that can minimize the inflow of foreign matter during the electrolyte supply process. [Means for solving the problem]

[0017] The electrolyte supply device for a secondary battery according to the present invention, which solves the aforementioned problems, is characterized by comprising: an upper hopper section (100) having a first storage space (S1) formed for temporarily storing the supplied electrolyte and a flow path (110) on its lower side; a lower hopper section (200) having a second storage space (S2) formed for guiding the electrolyte transferred from the upper hopper section (100) to a secondary battery (B); a needle section (300) that opens or closes the flow path (110) while being housed in the first storage space (S1) and moving up and down; and a nozzle section (400) housed inside the lower hopper section (200) and coupled to the upper hopper section (100) so as to communicate with the flow path (110).

[0018] Furthermore, in the electrolyte supply device for the secondary battery of the present invention, the nozzle portion (400) is characterized in that it has the shape of a hollow tube with open upper and lower ends and an empty interior.

[0019] Furthermore, in the electrolyte supply device for a secondary battery of the present invention, the lower opening of the nozzle portion (400) is located above the lower end of the lower hopper portion (200).

[0020] Furthermore, the electrolyte supply device for the secondary battery of the present invention is characterized in that one or more slits (410) are formed on the side surface of the nozzle portion (400).

[0021] Furthermore, in the electrolyte supply device for the secondary battery of the present invention, the one or more slits (410) are formed in a spiral shape along the side surface of the nozzle portion (400).

[0022] Also, in the electrolyte supply device of the secondary battery of the present invention, the needle portion (300) includes a first body portion (310) with an open upper portion and an empty interior, and an electrolyte outflow hole (311) formed on the side surface, a second body portion (320) positioned below the first body portion (310), and a nip portion (330) positioned below the second body portion (320), and the outer diameters become smaller in the order of the first body portion (310), the second body portion (320), and the nip portion (330).

[0023] Also, in the electrolyte supply device of the secondary battery of the present invention, the first sealing member (130) having a second movement path (131) formed in the center is provided in the flow path (110) of the upper hopper portion (100) so that the electrolyte moves. When the needle portion (300) descends, the lower end edge portion of the second body portion (320) closes the second movement path (131).

[0024] Also, in the electrolyte supply device of the secondary battery of the present invention, a ring-shaped first protrusion (132) is provided on the upper surface of the first sealing member (130), and the first protrusion (132) is positioned along the edge of the second movement path (131).

[0025] Also, in the electrolyte supply device of the secondary battery of the present invention, the first sealing member (130) is made of EPDM (Ethylene Propylene Rubber) material.

[0026] Also, in the electrolyte supply device of the secondary battery of the present invention, a socket member (120) having a first movement path (121) formed in the center is positioned above the first sealing member (130) so that the electrolyte moves. The first movement path (121) has a structure with a larger upper cross-sectional area and a smaller lower cross-sectional area as it goes downward.

[0027] Furthermore, in the electrolyte supply device for a secondary battery of the present invention, a third movement path (141) is provided in the center of the lower part of the first sealing member (130) so as to allow the electrolyte to move, and a coupling member (140) for fixing one side of the nozzle portion (400) is located therein.

[0028] Furthermore, in the electrolyte supply device for the secondary battery of the present invention, the coupling member (140) is characterized in that it is made of a metal material.

[0029] Furthermore, in the electrolyte supply device for a secondary battery of the present invention, the coupling member (140) is coupled to the nozzle portion (400) such that the third travel path (141) of the coupling member (140) and the nozzle portion (400) are in communication with each other.

[0030] Furthermore, the electrolyte supply device for a secondary battery of the present invention further includes a pallet (500) comprising an upper pallet (510) and a lower pallet (520), wherein the lower hopper section (200) is housed in the upper pallet (510) and the secondary battery (B) is housed in the lower pallet (520). [Effects of the Invention]

[0031] According to the electrolyte supply device for secondary batteries of the present invention, the flow path of the upper hopper section is equipped with a first sealing member, and the structure determines whether or not the electrolyte can move based on the weight of the needle section. This has the advantage of minimizing the decrease in sealing force even after long-term use.

[0032] Furthermore, the electrolyte supply device for secondary batteries of the present invention is equipped with a first sealing member in the flow path of the upper hopper section, and the structure determines whether or not the electrolyte can move based on the weight of the needle section. This provides excellent wear resistance and thus minimizes the generation of foreign matter.

[0033] Furthermore, the electrolyte supply device for secondary batteries of the present invention has the advantage of providing excellent sealing between the needle portion and the second transfer path, which allows for the supply of a fixed amount of electrolyte to the secondary battery, thereby reducing deviations in the amount of electrolyte injected.

[0034] Furthermore, the electrolyte supply device for secondary batteries of the present invention has the advantage of minimizing the scattering of electrolyte supplied to the lower hopper section, as it includes a nozzle section inside the lower hopper section that can disperse the direction of air inflow, thereby contributing to the supply of a fixed amount of electrolyte. [Brief explanation of the drawing]

[0035] [Figure 1] This is a conceptual diagram of an electrolyte supply device using conventional technology. [Figure 2] This is a magnified view of a portion of a conventional electrolyte supply device. [Figure 3] This is a view from one side of the electrolyte supply device for a secondary battery according to the present invention. [Figure 4] Figure 3 shows the electrolyte supply device viewed from the other side, illustrating the state before the electrolyte is supplied to the secondary battery. [Figure 5] Figure 3 shows the electrolyte supply device as viewed from the other side, illustrating the state after the electrolyte has been supplied to the secondary battery. [Figure 6] This is an exploded view illustrating the coupling structure between the upper hopper section and the needle section in the electrolyte supply device according to the present invention. [Figure 7] This is an enlarged view illustrating the path through which the electrolyte from the upper hopper section moves to the lower hopper section in the electrolyte supply device according to the present invention. [Figure 8] This is an enlarged cross-sectional view of the first sealing member constituting the electrolyte supply device according to the present invention. [Figure 9] Figure 8 is an enlarged perspective view of the first sealing member. [Figure 10] This is an enlarged view illustrating the coupling structure between the lower hopper section and the nozzle section in the electrolyte supply device according to the present invention. [Figure 11] Figure 10 is an enlarged perspective view of the nozzle section. [Modes for carrying out the invention]

[0036] In this application, terms such as “includes,” “have,” or “equip” are intended to specify the presence of features, figures, stages, components, parts, or combinations thereof as described in the specification, and should be understood not to preemptively exclude the possibility of the presence or addition of one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0037] Furthermore, the same reference numerals shall be used throughout the drawings for parts that have similar functions and operations. Throughout the specification, when it is said that one part is connected to another part, this includes not only direct connections but also indirect connections through other elements in between. Also, when it is said that a component is included, unless otherwise stated, it does not mean that other components are excluded, but rather that other components may be included.

[0038] The electrolyte supply device for a secondary battery according to the present invention will be described below with reference to the attached drawings.

[0039] Figure 3 is a view of the electrolyte supply device for a secondary battery according to the present invention from one side; Figure 4 is a view of the electrolyte supply device shown in Figure 3 from the other side, showing the state before the electrolyte is supplied to the secondary battery; Figure 5 is a view of the electrolyte supply device shown in Figure 3 from the other side, showing the state after the electrolyte has been supplied to the secondary battery; and Figure 6 is an exploded view illustrating the coupling structure between the upper hopper section and the needle section in the electrolyte supply device according to the present invention.

[0040] As shown in Figures 3 to 6, the electrolyte supply device for a secondary battery according to the present invention includes an upper hopper section 100, a lower hopper section 200, a needle section 300, a nozzle section 400, and a pallet 500.

[0041] First, the upper hopper section 100 is configured for temporarily storing the supplied electrolyte, and is equipped with a first storage space S1 having a certain volume, and a flow path 110 on the lower side.

[0042] For example, the diagram shows three first storage spaces S1, but this number can be increased or decreased as needed.

[0043] The lower hopper section 200 has a roughly cylindrical second storage space S2 that is open at the top and bottom and has an empty interior, in order to guide the electrolyte transferred from the upper hopper section 100 to the secondary battery B.

[0044] Here, it is preferable that the number of second storage spaces S2 be the same as the number of first storage spaces S1 in the upper hopper section 100 described above.

[0045] Next, the needle portion 300 is housed in the first containment space S1 and is configured to open or close the flow path 110, and operates to move up and down within the first containment space S1.

[0046] More specifically, the needle portion 300 includes a first body portion 310, a second body portion 320 located below the first body portion 310, and a nip portion 330 located below the second body portion 320.

[0047] The first fuselage section 310 is open at the top and hollow inside, allowing electrolyte to flow in, and has one or more electrolyte outflow holes 311 formed on its sides. Of course, electrolyte can be supplied to the first fuselage section 310 from the outside by connecting an injection pipe (not shown) to the open top of the first fuselage section 310.

[0048] The upper part of the second fuselage section 320 is connected to the first fuselage section 310, and the lower part is connected to the nip section 330. The lower part connected to the nip section 330 is conical in shape, becoming more pointed towards the bottom.

[0049] On the other hand, it is preferable that the outer diameter decreases in the order of the first body section 310, the second body section 320, and the nip section 330. This is to prevent the incoming electrolyte from flowing back.

[0050] Of course, it is preferable that the outer diameter of the first body portion 310 is slightly smaller than the inner diameter of the first accommodation space S1 so that the needle portion 300 can move up and down within the first accommodation space S1.

[0051] The nozzle section 400, which has a certain length, is housed inside the lower hopper section 200 and is configured to minimize the scattering of the electrolyte transferred to the lower hopper section 200, and is connected to communicate with the flow path 110. A detailed explanation of this will be given later.

[0052] The pallet 500, including the upper pallet 510 and the lower pallet 520, houses and secures the lower hopper section 200 and the secondary battery B.

[0053] In detail, the upper pallet 510 has a plate-like shape with a certain thickness, and the same number of holes as the lower hopper section 200 are formed vertically so that the lower hopper section 200 can be accommodated and fixed in place.

[0054] The lower pallet 520 is located below the upper pallet 510 and has a plate-like shape with a certain thickness. It houses and secures the secondary battery B, and the same number of housing grooves as the number of secondary battery B housed within it are formed vertically.

[0055] Of course, the bottom of the housing groove in the lower pallet 520 is sealed to prevent secondary battery B from falling out from the bottom.

[0056] Here, secondary battery B is a cylindrical secondary battery, before the cap assembly is attached. Generally, a cylindrical secondary battery is obtained by placing a jelly roll-type electrode assembly, which is wound up with a separator membrane interposed between long sheet-like positive and negative electrodes, into a battery case, injecting electrolyte, and then attaching and securing the cap assembly.

[0057] In this invention, the secondary battery B is a state in which the electrode assembly is housed in a battery case, the top of the battery case is open, and the electrode assembly corresponds to a known technical configuration, so a detailed explanation is omitted.

[0058] For example, although not shown in the drawings, the upper pallet 510 and the lower pallet 520 may be provided with known lifting means (not shown) so that they can move up and down individually or together.

[0059] When supplying electrolyte to secondary battery B, the process is carried out under reduced pressure conditions. Here, the lower end of the lower hopper section 200 is in close contact with the open end of secondary battery B, while the upper end of the lower hopper section 200 is in communication with the flow path 110 of the upper hopper section 100.

[0060] Therefore, the electrolyte in the upper hopper section 100 moves downward through the flow path 110 and the nozzle section 400, and as a result, the electrolyte flows into the secondary battery B through the lower hopper section 200.

[0061] Figure 7 is an enlarged view illustrating the path through which the electrolyte from the upper hopper section moves to the lower hopper section in the electrolyte supply device according to the present invention; Figure 8 is an enlarged cross-sectional view of the first sealing member constituting the electrolyte supply device according to the present invention; and Figure 9 is an enlarged perspective view of the first sealing member shown in Figure 8.

[0062] As mentioned above, the electrolyte moves downward along the flow path 110. Here, it is preferable to provide a socket member 120, a first sealing member 130, and a coupling member 140 in the flow path 110 so that the electrolyte can be reliably supplied or shut off.

[0063] First, the socket member 120 is provided with a first movement path 121 in the center so that the electrolyte can move. Here, it is preferable that the first movement path 121 has a structure that is wider at the top and narrower at the bottom, with the cross-sectional area decreasing towards the bottom, so that the electrolyte can collect well.

[0064] The first sealing member 130 is located below the socket member 120, and when the needle portion 300 descends, it comes into close contact with the lower side of the second body portion 320, more specifically with its lower edge.

[0065] In other words, the first sealing member 130 is configured to enhance the adhesion force with the second body portion 320 and reliably ensure that the electrolyte can move, and is substantially cylindrical in shape with a second movement path 131 in the center through which the electrolyte can pass.

[0066] Furthermore, it is preferable that one or more protrusions are formed on the upper and lower surfaces of the first sealing member 130. For example, the upper surface of the first sealing member 130 may be provided with a ring-shaped first protrusion 132, more specifically along the upper edge of the second movement path 131. Such a first protrusion 132 can increase the adhesion force with the second fuselage portion 320.

[0067] Furthermore, if the first sealing member 130 is provided with a ring-shaped second projection 133 at a certain distance from the upper surface, more specifically from the upper edge of the second movement path 131, the adhesion force with the socket member 120 can be improved. Here, it is preferable that the bottom surface of the socket member 120 be provided with a recess that can accommodate the second projection 133.

[0068] Furthermore, if the lower surface of the first sealing member 130, more specifically, is provided with a ring-shaped third projection 134 at a certain distance from the lower edge of the second movement path 131, the adhesion force between the upper hopper section 100 and the body can be increased. Here, it is preferable that the body of the upper hopper section 100 has a recess for accommodating the third projection 134.

[0069] Furthermore, it is preferable to provide a ring-shaped fourth projection 135 along the lower edge of the second movement path 131 of the first sealing member 130 in order to prevent the electrolyte from penetrating between the contact surface of the first sealing member 130 and the contact surface of the connecting member 140, and to minimize the backflow of the electrolyte upwards.

[0070] Here, the first sealing member 130 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), but is not limited to this as long as the same function and purpose can be achieved.

[0071] A coupling member 140 for fixing one side of the nozzle portion 400, more specifically the upper end of the nozzle portion 400, is located below the first sealing member 130 and has a third travel path 141 in the center through which the electrolyte passes.

[0072] Here, it is preferable that the fourth projection 135 of the first sealing member 130, as described above, protrudes slightly inward from the third movement path 141 of the connecting member 140.

[0073] Furthermore, a portion of the lower side of the connecting member 140 is exposed to the lower side of the upper hopper section 100, and the nozzle section 400 is connected to the inner surface of the connecting member 140.

[0074] For example, the connecting member 140 is a nut type with screw threads formed on both its outer and inner surfaces. The upper end of the nozzle section 400 can be connected to the inner surface using a male-female screw system, and the screw threads on the outer surface can be fixed to the upper hopper section 100.

[0075] The material of the connecting member 140 is not particularly limited, but it may be metal, preferably stainless steel.

[0076] As described above, the electrolyte flows into the nozzle section 400 after passing through the first travel path 121 of the socket member 120, the second travel path 131 of the first sealing member 130, and the third travel path 141 of the coupling member 140.

[0077] Of course, depending on the area where the nozzle portion 400 and the connecting member 140 overlap, it is clear that the fluid can flow into the nozzle portion 400 immediately after the second movement path 131 of the first sealing member 130, without passing through the third movement path 141.

[0078] Reference numeral 210 in the drawing indicates a second sealing member, which is configured to prevent electrolyte leakage by ensuring a tight seal between the upper hopper section 100 and the lower hopper section 200.

[0079] Conventionally, in order to prevent the leakage of electrolyte, an O-ring was attached to the second body or nip of the needle part, or an O-ring was placed in the flow path. However, this frequently generated excessive friction, which led to wear of the O-ring and, conversely, a decrease in sealing ability.

[0080] However, in the present invention, the first sealing member 130 is installed in the flow path and the weight of the needle portion 300 blocks the passage through which the electrolyte moves, so that the decrease in sealing force can be minimized even after long-term use.

[0081] Furthermore, since excessive friction between the first sealing member 130 and the second body portion of the needle can be prevented, the generation of foreign matter can be minimized.

[0082] Figure 10 is an enlarged view illustrating the coupling structure of the lower hopper section and the nozzle section in the electrolyte supply device according to the present invention, and Figure 11 is an enlarged perspective view of the nozzle section shown in Figure 10.

[0083] The electrolyte supplied to each secondary battery B housed in the lower pallet must always be a constant amount. If the supplied electrolyte splashes and adheres to the inner wall of the lower hopper section 200 or leaks to the outside, an deviation in the amount of electrolyte supplied may occur, leading to defects.

[0084] For example, the upper hopper section, or more precisely, the first containment space, contains a certain amount of electrolyte, with air mixed in with the electrolyte on top. However, since the supply process is carried out under reduced pressure conditions, when the electrolyte filled in the first containment space moves to the lower hopper section 200, air is then drawn in.

[0085] Such air strikes the electrolyte in the lower hopper section 200, causing the electrolyte to scatter and adhere to the inner wall of the lower hopper section 200. Consequently, there may be insufficient electrolyte to be injected into the secondary battery B, or conversely, the amount of electrolyte injected into a particular secondary battery B may be excessive due to the electrolyte adhering to the inner wall.

[0086] The nozzle section 400, housed inside the lower hopper section 200, is configured to minimize the aforementioned phenomenon, namely, the impact of air on the electrolyte, thereby preventing the electrolyte from splashing.

[0087] In detail, the nozzle portion 400 preferably has the shape of a hollow tube with an open interior and open top and bottom, more preferably has one or more slits 410 on its side, and most preferably has one or more slits 410 formed in a spiral shape along the side of the nozzle portion 400.

[0088] When the nozzle section 400 having the above configuration is provided together with the lower hopper section 200, after the electrolyte is transferred, the air that is drawn in is dispersed through the lower opening and the side slits 410 of the nozzle section 400, so that the scattering of the electrolyte can be minimized.

[0089] Furthermore, it is preferable that the lower opening of the nozzle section 400 be located above the lower end of the lower hopper section 200.

[0090] Although specific parts of the present invention have been described in detail above, such specific techniques are merely preferred modes of implementation and do not limit the scope of the present invention. It will be obvious to those skilled in the art that various changes and modifications are possible within the scope of the present invention and its technical concept, and it goes without saying that such variations and modifications also fall within the scope of the appended claims. [Explanation of Symbols]

[0091] 100 Upper hopper section 110 flow path 120 Socket component 121 First Movement Route 130 First sealing member 131 Second Movement Route 132 First Pier 133 Second Pier 134 Third Pier 135 Fourth Pier 140 Connecting member 141 Third Expedition Route 200 Lower hopper section 210 Second sealing member 300 Needle section 310 1st fuselage section 311 Electrolyte Outflow Hole 320 Second fuselage section 330 Nip section 400 Nozzle section 410 Slits 500 pallets 510 Upper Pallet 520 Lower Pallet S1 First containment space S2 Second containment space B Secondary battery

Claims

1. A first storage space is formed to temporarily store the supplied electrolyte, and an upper hopper section with a flow path is provided on the lower side. A lower hopper section is formed in which a second storage space is formed for guiding the electrolyte transferred from the upper hopper section to the secondary battery, A needle portion that opens or closes the flow path while moving up and down while being housed in the first containment space, An electrolyte supply device for a secondary battery, comprising: a nozzle portion housed inside the lower hopper portion and coupled to the upper hopper portion so as to communicate with the flow path.

2. The electrolyte supply device for a secondary battery according to claim 1, wherein the nozzle portion has the shape of a hollow tube with open top and bottom and a hollow interior.

3. The electrolyte supply device for a secondary battery according to claim 2, wherein the lower opening of the nozzle portion is located above the lower end of the lower hopper portion.

4. The electrolyte supply device for a secondary battery according to claim 2 or 3, wherein one or more slits are formed on the side surface of the nozzle portion.

5. The electrolyte supply device for a secondary battery according to claim 4, wherein one or more slits are formed in a spiral shape along the side surface of the nozzle portion.

6. The electrolyte supply device for a secondary battery according to claim 2 or 3, wherein the needle portion includes a first body portion which is open at the top and hollow inside, with an electrolyte outflow hole formed on the side, a second body portion located below the first body portion, and a nip portion located below the second body portion, and the outer diameter decreases in the order of the first body portion, the second body portion, and the nip portion.

7. The flow path in the upper hopper section is provided with a first sealing member having a second movement path formed in the center to allow the electrolyte to move. The electrolyte supply device for a secondary battery according to claim 6, wherein when the needle portion descends, the lower end edge of the second body portion blocks the second movement path.

8. The electrolyte supply device for a secondary battery according to claim 7, wherein the upper surface of the first sealing member is provided with a ring-shaped first projection, and the first projection is located along the edge of the second movement path.

9. The electrolyte supply device for a secondary battery according to claim 8, wherein the first sealing member is made of EPDM (Ethylene Propylene Rubber) material.

10. An electrolyte supply device for a secondary battery according to claim 7, wherein a socket member is positioned on the upper part of the first sealing member, the socket member having a first movement path in the center for the movement of the electrolyte, and the first movement path has a structure that is wider at the top and narrower at the bottom, with the cross-sectional area decreasing towards the bottom.

11. The electrolyte supply device for a secondary battery according to claim 7, wherein a third movement path is provided in the center of the lower part of the first sealing member so as to allow the electrolyte to move, and a coupling member for fixing one side of the nozzle portion is located therein.

12. The electrolyte supply device for a secondary battery according to claim 11, wherein the coupling member is made of a metal material.

13. The electrolyte supply device for a secondary battery according to claim 11, wherein the coupling member is coupled to the nozzle portion such that the third travel path of the coupling member and the nozzle portion are in communication with each other.

14. The electrolyte supply device for a secondary battery according to any one of claims 1 to 3, further comprising a pallet including an upper pallet and a lower pallet, wherein the upper pallet houses the lower hopper section and the lower pallet houses the secondary battery.

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