KR20230090826A - Precharger for secondary battery - Google Patents

Abstract

A precharger for a secondary battery is disclosed. The precharger for a secondary battery according to the present invention,
A leak-preventing suction unit for preventing overflow of the electrolyte inside the secondary battery cell during an activation process and discharging gas contained in the electrolyte to the outside, wherein the leak-preventing suction unit is in close contact with the electrolyte injection port formed in the secondary battery cell A vacuum nozzle part that prevents electrolyte leakage and sucks electrolyte and gas, and the vacuum nozzle part is connected to be able to move relative to each other, and the buffer space in which the electrolyte sucked by the vacuum nozzle part is stored and the vacuum nozzle part are in contact with the buffer space. It includes a suction chamber formed with a contact inner wall surface for sealing.

Description

Precharger for secondary battery {Precharger for secondary battery}

The present invention relates to a precharger for a secondary battery, and more particularly, to a charge/discharge process by inhaling an electrolyte of a secondary battery cell and a gas contained in the electrolyte, discharging the gas contained in the electrolyte, and storing the inhaled electrolyte. The present invention relates to a precharger for a secondary battery capable of improving the quality of a secondary battery cell by injecting the electrolyte solution into the secondary battery cell again after the completion of the process.

Secondary batteries have electrical characteristics such as high applicability and high energy density, so they are universally applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by an electrical driving source. It is becoming.

These secondary batteries are attracting attention as a new energy source for improving energy efficiency and eco-friendliness in that they do not generate any by-products due to the use of energy as well as the primary advantage of dramatically reducing the use of fossil fuels.

Currently, types of secondary batteries widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and the like. These secondary batteries form a battery pack by connecting a plurality of battery cells in series for a high output voltage. In addition, a battery pack may be configured by connecting a plurality of battery cells in parallel according to a charge/discharge capacity required for the battery pack. Accordingly, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge/discharge capacity.

Meanwhile, when configuring a battery pack by connecting a plurality of battery cells in series/parallel, a battery module composed of at least one battery cell is first configured, and other components are added using the at least one battery module to form a battery pack. How to configure is common.

These battery cells are lithium polymer batteries, and pouch-type secondary battery cells have recently been widely used. A pouch-type secondary battery cell compared to a prismatic type has advantages such as high energy density per unit weight and volume, and easy thinning and lightening of the battery cell. On the other hand, since the square and cylindrical types are sealed using an aluminum can, the risk of leakage of the electrolyte inside the cell is low, and it is recognized that the stability is higher than that of the pouch type. Recently, in the case of products from prismatic battery manufacturers, the standardization of prismatic batteries by car makers is being carried out while strengthening the efficient part compared to pouch-type batteries, which had an advantage in efficiency.

Looking at the manufacturing method of such a pouch-type secondary battery cell, first, a positive electrode plate and a negative electrode plate are manufactured, a separator is interposed therebetween, and then stacked to manufacture an electrode assembly.

Then, the electrode lead of the electrode assembly and the can cap are welded and inserted into the case. Then, the edge of the can cap is sealed by welding, and the electrolyte is injected using the electrolyte injection port of the can cap so that the electrode assembly is impregnated with the electrolyte.

Thereafter, an aging process is performed to stabilize the assembled battery cell as described above, and then a charge/discharge process is performed to activate the battery cell.

However, during the charging and discharging process, an irreversible reaction between the electrolyte and additives occurs due to the formation of an SEI layer, and gas is generated at this time. The gas inside the case needs to be removed, and if the gas is not removed, the battery cell may be defective.

Therefore, a degassing process is performed using a degassing device of a battery cell to remove gas inside the prismatic case even during the charging and discharging process.

A precharger for a secondary battery according to the prior art sucks the electrolyte and the gas contained in the electrolyte through a vacuum nozzle to discharge the electrolyte inside the prismatic case and the gas contained in the electrolyte to the outside, and discharges the gas contained in the electrolyte to the outside. The inhaled electrolyte is stored, and after the charging and discharging process is completed, the electrolyte is supplied back to the inside of the prismatic case.

However, the conventional precharger for a secondary battery has a problem in that the vacuum nozzle is damaged due to the vertical movement of the vacuum nozzle for suctioning and limiting suction of the electrolyte, so that the suctioned electrolyte cannot be sealed.

In addition, the vacuum nozzle of the pre-charger for secondary batteries according to the prior art has problems in that assembly is complicated and maintenance is difficult.

Korean Patent Publication No. 10-2018-0062835, (2018.06.11)

The problem to be solved by the present invention is to provide a precharger for a secondary battery that can prevent damage to a vacuum nozzle unit that sucks an electrolyte solution and is easy to assemble and maintain.

According to one aspect of the present invention, during the activation process, the electrolyte inside the secondary battery cell overflows and prevents exposure to the outside of the secondary battery cell and includes a suction unit for preventing leakage to discharge gas contained in the electrolyte solution to the outside, The leak-preventing suction unit is in close contact with the electrolyte injection hole formed in the secondary battery cell to prevent leakage of the electrolyte, and includes a vacuum nozzle unit for sucking the electrolyte and the gas; and a suction chamber connected to the vacuum nozzle unit to be relatively movable and having a contact inner wall surface formed therein to seal the buffer space by contacting the vacuum nozzle unit with a buffer space in which the electrolyte solution sucked by the vacuum nozzle unit is stored. A precharger for a secondary battery may be provided.

The suction chamber may include an upper block; and a lower block coupled to the upper block, disposed below the upper block, and having the buffer space formed therein, wherein the lower block communicates with the buffer space, is disposed below the buffer space, and includes the contact inner wall surface. A taper hole forming a is provided, and the taper hole may be formed in a shape in which an inner diameter gradually decreases toward a lower side.

A nozzle through-hole communicating with the taper hole, disposed below the taper hole, and through which the vacuum nozzle unit passes may be formed in the lower block.

An inner diameter of the nozzle through-hole may be smaller than an inner diameter of the buffer space.

The vacuum nozzle unit may include a tapered nozzle head formed in a shape in which an outer diameter decreases toward a lower side so as to correspond to the shape of the inner wall surface of the contact; and a nozzle body connected to the tapered nozzle head, communicated with the buffer space, and having a flow pipe through which the electrolyte flows.

The flow conduit includes a vertical conduit formed extending in a vertical direction; and a horizontal conduit communicating with the vertical conduit and extending in a horizontal direction.

One or more horizontal conduits are provided, and the horizontal conduits may be connected to the vertical conduits to serve as passages for removing the electrolyte and the gas.

The leak-preventing suction unit may further include an elastic body that is disposed inside the buffer space and elastically presses the vacuum nozzle toward the secondary battery cell.

A concave groove into which a portion of the elastic body is inserted may be formed at an upper end of the nozzle head.

The vacuum nozzle unit is inserted into the mounting groove for the head formed on the outer wall surface of the tapered nozzle head, the sealing O-ring that can come into contact with the inner wall surface of the contact; and an O-ring for motion inserted into a mounting groove for a body formed on an outer wall surface of the nozzle body and in contact with an inner wall surface of the nozzle through-hole.

The horizontal conduit may be disposed between the O-ring for sealing and the O-ring for exercise.

A gas discharge pipe communicating with the buffer space and discharging gas contained in the electrolyte solution may be formed in the lower block.

The leakage preventing suction unit may further include a discharge valve coupled to the lower block, communicated with the gas discharge pipe, and discharging gas included in the electrolyte solution to the outside.

The suction chamber may further include a sealing O-ring disposed between the upper block and the lower block to seal between the upper block and the lower block.

Embodiments of the present invention, a vacuum nozzle unit that is in close contact with an electrolyte injection hole formed in a secondary battery cell to prevent leakage of the upper electrolyte solution and sucks the electrolyte solution and the gas contained in the electrolyte solution, and the vacuum nozzle unit are connected to be relatively movable and a suction chamber having a buffer space storing the electrolyte sucked by the vacuum nozzle unit and a contact inner wall surface that seals the buffer space by contacting the vacuum nozzle unit therein, thereby preventing the vacuum nozzle unit from being damaged due to the vertical movement of the vacuum nozzle unit. It has the advantage of being easy to assemble and maintain.

1 is a plan view illustrating a suction unit for preventing leakage of a precharger for a secondary battery according to an embodiment of the present invention.
FIG. 2 is an enlarged view of the suction chamber and the vacuum nozzle of FIG. 1 .
FIG. 3 is a view showing the suction chamber of FIG. 2;
4 is a perspective view of the vacuum nozzle unit of FIG. 2;
5 is an operating state diagram of FIG. 2 .

In order to fully understand the present invention and its operational advantages and objectives achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

1 is a plan view showing a suction unit for preventing leakage of a precharger for a secondary battery according to an embodiment of the present invention, FIG. 2 is an enlarged view of a suction chamber and a vacuum nozzle part of FIG. 1, and FIG. 3 is FIG. 2 , FIG. 4 is a perspective view showing the vacuum nozzle unit of FIG. 2 , and FIG. 5 is an operating state diagram of FIG. 2 .

As shown in FIGS. 1 to 5 , the precharger for a secondary battery according to the present embodiment is exposed to the outside of a secondary battery cell (not shown) by overflowing during an activation process. and a stage unit (not shown) disposed in the lower region of the leakage preventing suction unit 10 and in which a secondary battery cell (not shown) is seated. ) and an elevation part (not shown) connected to the stage unit (not shown) to move the stage unit (not shown) in a direction approaching and away from the leak-preventing suction unit 10.

The leak-preventing suction unit 10 prevents overflow of the electrolyte inside a secondary battery cell (not shown) and discharges gas contained in the electrolyte to the outside. The leak-preventing suction unit 10 is disposed in an upper region of a stage unit (not shown).

The leak-preventing suction unit 10 is connected to and supported by the base frame. A vacuum nozzle unit 100 and a suction chamber 200 are installed in the leak-preventing suction unit 10 .

The vacuum nozzle unit 100 is connected to the suction chamber 200 so as to be relatively movable. Inside the suction chamber 200, the buffer space 221 storing the electrolyte sucked by the vacuum nozzle part 100 and the vacuum nozzle part 100 come into contact with each other to seal the buffer space 221. ) is formed.

As shown in FIGS. 2 to 5 , the suction chamber 200 according to this embodiment is coupled to the upper block 210 and the upper block 210 and is disposed below the upper block 210 and has a buffer space. A sealing O-ring 230 disposed between the lower block 220 on which 221 is formed and the upper block 210 and the lower block 220 to seal between the upper block 210 and the lower block 220 and an elastic body 300 disposed inside the buffer space 221 and elastically pressing the vacuum nozzle unit 100 toward a secondary battery cell (not shown).

The upper block 210 is formed in a rectangular block shape. This upper block 210 is coupled to the upper end of the lower block 220. The lower block 220 is formed in a rectangular block shape. The lower block 220 is coupled to the lower end of the upper block 210 and disposed below the upper block 210.

A buffer space 221 is formed in the lower block 220 to store the electrolyte solution sucked by the vacuum nozzle unit 100 . The buffer space 221 is formed by being depressed to a predetermined depth from the upper end of the lower block 220 to the lower end.

In addition, the lower block 220 is formed with a taper hole 222 communicating with the buffer space 221, disposed below the buffer space 221, and forming a contact inner wall surface 222a.

In this embodiment, the taper hole 222 is formed in a shape in which the inner diameter gradually decreases toward the lower side. The inner wall surface of the taper hole 222 is contacted with the vacuum nozzle unit 100 to form a contact inner wall surface 222a for sealing the buffer space 221 .

In this way, the taper hole 222 forming the contact inner wall surface 222a is formed in a shape in which the inner diameter gradually decreases toward the lower side, so that the vacuum nozzle unit 100 moves up and down to form a tapered shape of the vacuum nozzle unit 100. The nozzle head 110 can be easily adhered to and released from the contact inner wall surface 222a, and accordingly, the tapered nozzle head 110 and the sealing O-ring 130 are formed by the vertical movement of the vacuum nozzle unit 100. and the contact inner wall surface 222a is prevented from being damaged.

A nozzle through hole 223 through which the vacuum nozzle unit 100 passes is formed in the lower block 220 . The nozzle through hole 223 communicates with the taper hole 222 and is disposed below the taper hole 222 . In this embodiment, the inner diameter of the nozzle through hole 223 is smaller than the inner diameter of the buffer space 221 .

In addition, a gas discharge pipe 224 is formed in the lower block 220 to discharge gas contained in the electrolyte. The gas discharge pipe 224 communicates with the buffer space 221 so that the gas contained in the electrolyte solution can be discharged to the outside through the discharge valve 400 .

As shown in FIG. 2 , the sealing O-ring 230 is disposed between the upper block 210 and the lower block 220 to seal the gap between the upper block 210 and the lower block 220 .

Meanwhile, the vacuum nozzle unit 100 is in close contact with an electrolyte injection hole (not shown) formed in a secondary battery cell (not shown) to prevent leakage of the electrolyte solution, thereby preventing the electrolyte solution from being exposed to the outside of the secondary battery.

In addition, the vacuum nozzle unit 100 is inserted into the secondary battery cell (not shown) to suck the electrolyte and the gas included in the electrolyte.

As shown in FIGS. 2, 4 and 5, the vacuum nozzle unit 100 has a tapered nozzle head formed in a shape in which the outer diameter decreases toward the lower side so as to correspond to the shape of the contact inner wall surface 222a ( 110), a nozzle body 120 connected to the tapered nozzle head 110, capable of communicating with the buffer space 221, and formed with flow channels 121 and 122 through which the electrolyte flows, and the tapered nozzle head 110 ) Is inserted into the mounting groove 111 for the head formed on the outer wall surface of the sealing O-ring 130 that can come into contact with the inner wall surface 222a, and the mounting groove for the body formed on the outer wall surface of the nozzle body 120 ( 123) and includes an exercise O-ring 140 that is in contact with the inner wall surface of the nozzle through-hole 223, and a suction pipe 150 coupled to the nozzle body 120 and having a suction pipe 151 formed therein.

The tapered nozzle head 110 is formed in a conical shape whose outer diameter decreases toward the lower side so as to correspond to the shape of the contact inner wall surface 222a. An outer wall surface of the tapered nozzle head 110 is formed with a mounting groove 111 for a head into which an O-ring 130 for sealing is inserted.

In addition, a concave groove 112 into which the lower end of the elastic body 300 is inserted is formed at the upper end of the nozzle head.

The nozzle body 120 is formed in a long tubular shape. The nozzle body 120 may be connected to the tapered nozzle head 110 and communicate with the buffer space 221 . A mounting groove 123 for a body into which an O-ring 140 for exercise is inserted is formed on the outer wall surface of the nozzle body 120 .

In addition, the nozzle body 120 is formed with flow pipes 121 and 122 through which the electrolyte flows. As shown in FIG. 4, the flow conduits 121 and 122 communicate with the vertical conduit 121 extending in the vertical direction and the horizontal conduit 122 extending in the horizontal direction while communicating with the vertical conduit 121. ).

The vertical conduit 121 is formed along the longitudinal direction of the nozzle body 120 . The inlet 121a of the vertical pipe 121 is disposed at the lower end of the nozzle body 120.

The horizontal conduit 122 is located in the upper region of the nozzle body 120 and communicates with the new conduit. The outlet 122a of the horizontal conduit 122 is disposed on the side wall of the nozzle body 120.

In this embodiment, the horizontal conduit 122 is provided in one or multiple pieces. A plurality of horizontal conduits 122 may be radially spaced from each other with respect to the vertical conduits 121 . The horizontal conduit 122 is connected to the vertical conduit 121 and may be a passage for removing electrolyte and gas.

The transverse conduit 122 is disposed between the O-ring 130 for sealing and the O-ring 140 for motion. As such, the transverse conduit 122 is disposed between the sealing O-ring 130 and the motion O-ring 140, so that the sealing O-ring 130 is released from the contact inner wall surface 222a and the buffer space 221 is formed. When opened, the electrolyte discharged from the transverse conduit 122 flows into the buffer space 221 .

Meanwhile, the elastic body 300 is disposed inside the buffer space 221 . The elastic body 300 elastically presses the vacuum nozzle unit 100 disposed in the upper region of the secondary battery cell (not shown) in a direction (downward direction) toward the secondary battery cell (not shown). The upper end of the elastic body 300 is connected to the lower end of the upper block 210 and the lower end is connected to the upper end of the vacuum nozzle unit 100 .

In this way, since the elastic body 300 is disposed inside the buffer space 221, there is no need to install a separate fixture for imparting a preload to the elastic body 300, so there is an advantage in that installation and assembly are easy and maintenance is easy.

The sealing O-ring 130 is inserted into the head mounting groove 111 formed on the outer wall surface of the tapered nozzle head 110 . The sealing O-ring 130 contacts and releases contact with the inner wall surface 222a to seal and release the sealing of the buffer space 221 .

In this way, the O-ring for sealing 130 contacts and releases contact with the contact inner wall surface 222a by the rising and falling of the vacuum nozzle unit 100, so that the O-ring for sealing in the process of sealing and releasing the sealing of the buffer space 221. Damage to (130) can be prevented.

The exercise O-ring 140 is inserted into the mounting groove 123 for the body formed on the outer wall surface of the nozzle body 120. The O-ring 140 for movement is in contact with the inner wall surface of the nozzle through-hole 223 .

The suction pipe 150 is coupled to the nozzle body 120. A suction pipe 151 is formed in the suction pipe 150, and the suction pipe 151 communicates with the vertical pipe 121 described above. A lower portion of the suction pipe 150 may be inserted into a secondary battery cell (not shown).

Meanwhile, the suction unit 10 for leak prevention includes a discharge valve 400 . The discharge valve 400 is coupled to the lower block 220 and communicates with the gas discharge pipe 224 . The discharge valve 400 discharges the gas contained in the electrolyte to the outside.

In this embodiment, the discharge valve 400 is connected to a separate pump (not shown) to adjust the pressure of the buffer space 221 to negative pressure and positive pressure. By adjusting the pressure of the buffer space 221 , the electrolyte may flow into the buffer space 221 and be discharged from the buffer space 221 .

A stage unit (not shown) is disposed in the lower region of the suction unit 10 for preventing leakage. A secondary battery cell (not shown) is seated on the upper surface of the stage unit (not shown).

An elevating unit (not shown) is connected to the stage unit. The elevating unit (not shown) raises and lowers the stage unit (not shown) to move the stage unit (not shown) in a direction approaching and away from the leak-preventing suction unit 10 .

Hereinafter, an operation of the precharger for a secondary battery according to the present embodiment will be described with reference to FIGS. 1 to 5 .

As shown in FIG. 2, in the state where the buffer space 221 is closed, the stage unit (not shown) rises upward so that the suction pipe 150 of the vacuum nozzle unit 100 is connected to the secondary battery cell (not shown). Go inside and inhale the electrolyte. As the stage unit (not shown) rises, the secondary battery cell (not shown) lifts the vacuum nozzle unit 100 .

As the vacuum nozzle unit 100 rises, the tapered nozzle head 110, which was in close contact with the contact inner wall surface 222a, is released from the contact inner wall surface 222a. In particular, the close contact between the sealing O-ring 130 and the contact inner wall surface 222a is released.

As the tapered nozzle head 110 rises, the buffer space 221 is opened, and the electrolyte solution passing through the suction pipe 151, the vertical pipe 121, and the flow pipes 121 and 122 enters the buffer space 221. is introduced At this time, the gas included in the electrolyte solution flowing into the buffer space 221 is discharged to the discharge valve 400 via the gas discharge pipe 224 .

After the gas is discharged, the electrolyte solution introduced into the buffer space 221 is discharged from the buffer space 221 and then introduced into the secondary battery cell (not shown).

As described above, the precharger for a secondary battery according to the present embodiment includes a vacuum nozzle unit 100 that is inserted into a secondary battery cell (not shown) and sucks an electrolyte and a gas included in the electrolyte, and a vacuum nozzle unit 100. A buffer space 221 connected to be relatively movable and storing the electrolyte sucked by the vacuum nozzle part 100 therein and the contact inner wall surface 222a for sealing the buffer space 221 by contacting the vacuum nozzle part 100 By having the formed suction chamber 200, the vacuum nozzle unit 100 can be prevented from being damaged due to vertical movement of the vacuum nozzle unit 100, and assembly and maintenance are easy.

Although the present embodiment has been described in detail with reference to the drawings, the scope of rights of the present embodiment is not limited to the above-described drawings and description.

As such, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations should fall within the scope of the claims of the present invention.

10: suction unit for leak prevention 100: vacuum nozzle part
110: tapered nozzle head 111: mounting groove for head
112: concave groove 120: nozzle body
121: vertical pipe 122: horizontal pipe
123: Mounting groove for body 130: O-ring for sealing
140: exercise O-ring 200: suction chamber
210: upper block 220: lower block
221: buffer space 222: taper hole
222a: contact inner wall surface 223: nozzle through-hole
224: gas discharge pipe 230: O-ring for sealing
300: elastic body 400: discharge valve

Claims (14)

A suction unit for preventing leakage to prevent leakage of the secondary battery cell from being exposed to the outside of the secondary battery cell by overflowing the electrolyte solution during the activation process and discharging gas contained in the electrolyte solution to the outside;
The suction unit for preventing leakage,
a vacuum nozzle unit adhering to an electrolyte injection hole formed in the secondary battery cell to prevent leakage of the electrolyte solution and preventing the electrolyte solution from being exposed to the outside of the secondary battery, and sucking the electrolyte solution and the gas; and
A secondary suction chamber including a suction chamber connected to the vacuum nozzle unit to be relatively movable and formed with a buffer space in which the electrolyte solution sucked by the vacuum nozzle unit is stored and a contact inner wall surface that seals the buffer space by contacting the vacuum nozzle unit. Battery precharger. According to claim 1,
The suction chamber,
upper block; and
A lower block coupled to the upper block, disposed below the upper block, and having the buffer space formed therein;
In the lower block,
A taper hole communicating with the buffer space, disposed below the buffer space, and forming the contact inner wall surface is provided;
The precharger for secondary batteries, characterized in that the taper hole is formed in a shape in which the inner diameter gradually decreases toward the lower side. According to claim 2,
In the lower block,
A precharger for a secondary battery, characterized in that a nozzle through-hole is formed in communication with the taper hole, disposed below the taper hole, and through which the vacuum nozzle unit passes. According to claim 3,
The precharger for a secondary battery, characterized in that the inner diameter of the nozzle through-hole is formed smaller than the inner diameter of the buffer space. According to claim 4,
The vacuum nozzle part,
a tapered nozzle head formed in a shape whose outer diameter decreases toward the lower side so as to correspond to the shape of the contact inner wall surface; and
A precharger for a secondary battery comprising a nozzle body connected to the tapered nozzle head, communicated with the buffer space, and having a flow pipe through which the electrolyte flows. According to claim 5,
In the flow pipe,
a vertical tube formed by extending in a vertical direction; and
A precharger for a secondary battery comprising a horizontal conduit communicating with the vertical conduit and extending in a horizontal direction. According to claim 6,
The transverse conduit is provided with one or multiple,
The precharger for a secondary battery, characterized in that the horizontal conduit is connected to the vertical conduit and becomes a passage for removing the electrolyte and the gas. According to claim 5,
The suction unit for preventing leakage,
The precharger for a secondary battery further comprising an elastic body disposed inside the buffer space and elastically pressing the vacuum nozzle toward the secondary battery cell. According to claim 8,
A precharger for a secondary battery in which a concave groove into which a portion of the elastic body is inserted is formed at an upper end of the nozzle head. According to claim 6,
The vacuum nozzle part,
an O-ring for sealing that is inserted into the head mounting groove formed on the outer wall surface of the tapered nozzle head and can come into contact with the contact inner wall surface; and
A precharger for a secondary battery, further comprising an O-ring for motion inserted into a mounting groove for a body formed on an outer wall surface of the nozzle body and contacting an inner wall surface of the nozzle through-hole. According to claim 10,
The transverse conduit is a precharger for a secondary battery, characterized in that disposed between the O-ring for sealing and the O-ring for exercise. According to claim 2,
In the lower block,
A precharger for a secondary battery, characterized in that a gas discharge pipe is formed in communication with the buffer space and through which gas contained in the electrolyte is discharged. According to claim 12,
The suction unit for preventing leakage,
The precharger for a secondary battery further comprising a discharge valve coupled to the lower block, communicating with the gas discharge pipe, and discharging gas contained in the electrolyte solution to the outside. According to claim 2,
The suction chamber,
The precharger for a secondary battery further comprising an O-ring for sealing disposed between the upper block and the lower block to seal between the upper block and the lower block.

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