KR102030058B1 - Secondary battery and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a secondary battery, comprising an electrode assembly, an electrolyte, and a case accommodating the electrode assembly and the electrolyte, the case comprising: an accommodating part accommodating the electrode assembly and the electrolyte; A gas pocket part provided on an upper part of the accommodating part and including an inlet for introducing a gas generated in the accommodating part by mutual reaction of the electrode assembly and the electrolyte, and a discharge port for discharging the gas collected through the inlet to the outside; The gas pocket part may be provided with a barrier wall that guides the gas introduced from the inlet to be discharged through the outlet.

Description

Secondary battery and manufacturing method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery and a method for manufacturing the same, and more particularly, to a secondary battery and a method for manufacturing the same, which prevent the electrolyte from being discharged together during gas discharge generated in the case.

Generally, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Such a secondary battery is widely used in advanced electronic devices such as phones, notebook computers, and camcorders.

Patent registration number 10-0958649

The secondary battery according to the prior art includes an electrode assembly, an electrolyte and a case in which the electrode assembly and the electrolyte are accommodated, and the case collects the electrode assembly and the electrolyte, and collects the gas generated in the receiving part and discharges it to the outside. It is provided with a gas pocket portion.

Meanwhile, the secondary battery performs an activation process and a degas process to improve battery performance. That is, the activation process is to improve the performance by charging and discharging the secondary battery many times, the degas process is to discharge the gas generated inside the secondary battery to the outside during the activation process.

Here, the degassing process of the secondary battery will be described in more detail. The gas is generated by the mutual reaction between the electrode assembly and the electrolyte, and the gas is collected into the gas pocket part through the receiving part, and then a discharge hole formed in the gas pocket part is opened. Discharged through the outside.

However, there is a problem in that not only the gas but also a portion of the electrolyte is discharged through the discharge hole of the gas pocket part during the degas process, and thus the performance of the secondary battery is deteriorated while the electrolyte contained in the secondary battery decreases.

The present invention has been invented to solve the above problems, an object of the present invention is to prevent the discharge of the electrolyte when the gas discharged in the case together, thereby preventing the shortage of the electrolyte to improve the performance of the battery secondary It is to provide a battery and a method of manufacturing the same.

A secondary battery according to the present invention for achieving the above object includes an electrode assembly, an electrolyte and a case for accommodating the electrode assembly and the electrolyte, the case, the accommodating portion for receiving the electrode assembly and the electrolyte; A gas pocket part provided on an upper part of the accommodating part and including an inlet for introducing a gas generated in the accommodating part by mutual reaction of the electrode assembly and the electrolyte, and a discharge port for discharging the gas collected through the inlet to the outside; The gas pocket part may be provided with a barrier wall that guides the gas introduced from the inlet to be discharged through the outlet.

The blocking wall may be provided in the gas pocket part between the inlet and the outlet.

The inlet and the discharge port are formed to correspond to the up and down direction on one side of the gas pocket portion, the blocking wall is one end is connected to one side of the gas pocket portion, the other end is extended between the inlet and the discharge port and the inlet and It can block between the discharge port.

The blocking wall may be formed by sealing the gas pocket part between the inlet and the outlet.

The barrier wall may be inclined downward gradually from one end to the other end.

When there are two or more barrier walls, they may be provided in a zigzag form at regular intervals.

The barrier wall may have any one of a straight line shape, an uneven shape, and a wavy shape.

One or more fine holes may be formed in the barrier wall.

On the other hand, the manufacturing method of the secondary battery according to the present invention having the configuration as described above (a) a case provided with a gas pocket portion is formed in the receiving portion for receiving the electrode assembly, the inlet connected to the receiving portion and the opening connected to the outside is formed. Preparing a; (b) fixing the case in a state in which the gas pocket part faces upward, and injecting electrolyte into the receiving part through an opening provided in the gas pocket part; (c) sealing and closing the opening when the electrolyte solution is injected; (d) sealing a side portion of the gas pocket part positioned above the inlet in the width direction to form a barrier wall; (e) charging and discharging by applying a voltage to the electrode assembly accommodated in the case; And (f) when charging and discharging is completed, cutting the gas pocket part positioned above the blocking wall to form a discharge hole, wherein the gas generated in the accommodating part by the step (e) passes through the inlet port. The gas may flow into the gas pocket part and may rotate along the wall surface of the blocking wall and then be discharged to the discharge port.

Step (c) and step (d) may be performed simultaneously.

In the step (d), the blocking wall may be formed on the same vertical line as the inlet.

In the step (f), the discharge port may be formed on the same vertical line as the blocking wall.

In the step (d), the blocking wall may be formed to be connected to one side of the gas pocket part adjacent to the inlet.

The present invention has the following effects.

First: The secondary battery according to the present invention can reduce the speed of the gas and increase the residence time by turning the gas collected and discharged in the gas pocket portion through the blocking wall formed in the gas pocket portion, it is included in the gas The fine electrolyte solution can be aggregated and separated from the gas, thereby preventing the discharge of the electrolyte solution together with the gas, and preventing the shortage of the electrolyte solution.

Second: In the secondary battery according to the present invention, the inlet, the outlet, and the blocking wall formed in the gas pocket part are located on the same vertical line, thereby stably turning the gas.

Third: The secondary battery according to the present invention can be easily manufactured by forming a blocking wall by heat-sealing the gas pocket portion.

1 is a front view showing a secondary battery according to a first embodiment of the present invention.
2 is a cross-sectional view of a rechargeable battery according to a first exemplary embodiment of the present invention.
3 is a flowchart illustrating a method of manufacturing a secondary battery according to a first embodiment of the present invention.
4 to 6 are working diagrams illustrating a method of manufacturing a secondary battery according to a first embodiment of the present invention. 6 shows a sealing step, and FIG. 6 shows a gas discharge step.
7 is a cross-sectional view of a rechargeable battery according to a second exemplary embodiment of the present invention.
8 is a cross-sectional view of a rechargeable battery according to a third exemplary embodiment of the present invention.
9 is a cross-sectional view of a rechargeable battery according to a fourth exemplary embodiment of the present invention.
10 is a cross-sectional view of a rechargeable battery according to a fifth exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

On the other hand, the arrow ← indicated in the drawing of the present invention indicates the turning and moving direction of the gas.

1 and 2, the secondary battery 100 according to the first embodiment of the present invention includes an electrode assembly 110, an electrolyte solution 120, and a case accommodating the electrode assembly 110 and the electrolyte solution 120. 130).

That is, the secondary battery 100 according to the first embodiment of the present invention is assembled by sealing the rim in a state in which the electrode assembly 110 and the electrolyte 120 are accommodated in the case 130.

Meanwhile, the assembled secondary battery performs an activation process and a degas process to improve battery performance.

In other words, the activation process performs the function of giving the characteristics of the battery by repeating the charging and discharging process several times so that the first battery that is assembled can store electrical energy. In addition, the degas process performs a function of discharging the gas generated inside the battery cell to the outside by the activation process.

As described above, the case 130 of the secondary battery 100 according to the present invention for performing the activation process and the degas process may include an accommodating part 131 for accommodating the electrode assembly 110 and the electrolyte 120, and an accommodating part ( It is provided with a gas pocket 132 for collecting and discharging the gas generated in the 131.

As shown in FIGS. 1 and 2, the gas pocket part 132 is provided on the receiving part 131, and the receiving part 131 is formed by mutual reaction of the electrode assembly 110 and the electrolyte solution 120. The inlet 132a which introduces the gas which generate | occur | produced in and the discharge port 132b which discharges the gas which flowed in by the inlet 132a to the outside are formed.

That is, the gas pocket part 132 flows in and collects the gas generated in the accommodating part 131 and discharges it to the outside.

Meanwhile, during the degas process, not only the gas through the gas pocket part 132 but also some of the electrolyte contained in the accommodating part 131 are discharged together to prevent a shortage of the electrolyte, which may cause a problem in battery performance. have. That is, there was a problem that the fine electrolyte is discharged to the outside in the state contained in the gas.

In order to solve this problem, the secondary battery according to the present invention reduces the speed of the gas introduced into the gas pocket unit 132 and simultaneously turns the electrolyte contained in the gas to aggregate to separate the electrolyte from the gas. That is, the fine electrolyte solution may be prevented from being discharged while being separated from the gas while being agglomerated into droplet sizes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Gas Pocket Part According to First Embodiment]

As shown in FIGS. 1 and 2, the gas pocket part 132 according to the first embodiment includes a blocking wall that turns the gas introduced from the inlet 132a and then discharges it through the outlet 132b ( 132c) is formed.

That is, while the gas introduced from the inlet 132a impinges on the blocking wall 132c, the electrolyte may be separated from the gas primarily while some of the electrolyte included in the gas remains on the blocking wall 132c.

The gas collided with the blocking wall 132c is discharged to the discharge port 132b by turning the blocking wall 132c. At this time, the speed of the gas turning the blocking wall 132c is reduced and the residence period is increased. The electrolyte is agglomerated in a drop size and falls to the bottom, thereby separating the electrolyte from the gas.

As described above, the gas pocket part 132 according to the first embodiment may include the blocking wall 132c to separate the electrolyte from the gas, thereby preventing the discharge of the electrolyte together with the gas, thereby preventing the electrolyte shortage. .

On the other hand, the blocking wall 132c is provided inside the gas pocket 132 between the inlet 132a and the outlet 132b, and thus the entire gas passing through the inlet 132a collides with the blocking wall 132c and pivots. After the discharge can be induced to be discharged through the discharge port (132b).

On the other hand, the inlet 132a and the outlet 132b are formed to correspond to the one side (right side when viewed in FIG. 2) of the gas pocket 132 in the vertical direction, the blocking wall 132c is one end of the gas pocket It is connected to one side (right side as seen in FIG. 2) of the part 132, and the other end extends between the inlet 132a and the outlet 132b, and through the blocking wall 132c, the inlet 132a and the outlet ( 132b) can be blocked stably.

That is, the inlet 132a, the outlet 132b, and the blocking wall 132c are formed on the same vertical line, that is, the inlet 132a, the outlet 132b, and the blocking wall 132c are one of the gas pockets 132. By forming the side portion, the gas passing through the inlet 132a can be turned to the longest through the blocking wall 132c and then discharged to the outlet 132b.

That is, the gas introduced into one side of the gas pocket 132 from the inlet 132a by the blocking wall 132c is turned to the other side of the gas pocket 132 and then discharged to the discharge port 132b.

On the other hand, the blocking wall (132c) is formed by sealing the gas pocket portion between the inlet and the discharge port with heat and pressure, it can form a barrier without additional configuration.

Referring to the manufacturing method of the secondary battery according to the first embodiment of the present invention having such a configuration as follows.

[Method of Manufacturing Secondary Battery According to First Embodiment]

In the method of manufacturing a secondary battery according to the first embodiment of the present invention, as shown in FIG. 3, (a) case preparation step, (b) electrolyte injection step, (c) sealing step, and (d) barrier wall formation. Step, (e) charging and discharging step, (f) gas discharge step.

As shown in FIG. 4, the case preparing step includes a gas in which a receiving part 131 accommodating the electrode assembly 110 and an inlet 132a into which gas generated in the receiving part 131 is introduced and collected are collected. The case 130 provided with the pocket part 132 is prepared. Then, the end of the gas pocket portion 132 is cut to form an opening.

(b) In the electrolyte injection step, when the preparation of the case 130 is completed, the case 130 is fixed to the electrolyte injection device (not shown) with the gas pocket 132 facing upward, and the electrolyte injection device is used. By injecting the electrolyte 120 through the opening of the gas pocket 132 to be accommodated in the receiving portion 132.

(c) As shown in FIG. 5, when the injection of the electrolyte is completed, the opening of the gas pocket 132 is sealed with heat and pressure to seal the sealing step.

In the blocking wall forming step, when the sealing of the opening is completed, the blocking part 132c is formed by sealing the gas pocket part 132 on the upper side of the inlet 132a with heat and pressure. At this time, the blocking wall 132c is formed at one side of the gas pocket part 132 and is formed long in the width direction of the gas pocket part 132.

Here, step (c) and step (d) may be performed at the same time, thereby increasing the efficiency of the work.

(e) In the charging and discharging step, when the blocking wall is formed, charging and discharging are performed several times by supplying a voltage to the electrode assembly 110 accommodated in the accommodating part 131, thereby improving battery performance.

At this time, a gas is generated in the accommodating part 131 by the mutual reaction of the electrode assembly 110 and the electrolyte 120, and the gas generated in the accommodating part 131 is collected in the gas pocket part 132 through the inlet 132a. do. At this time, the gas introduced into the gas pocket part 132 collides with the blocking wall 132c, and some of the electrolyte contained in the gas remains in the blocking wall 132c, and the electrolyte remaining in the blocking wall 132c is aggregated again. It is recovered to the receiving portion 131.

The gas collided with the blocking wall 132c is collected at the upper portion of the gas pocket part 132 by turning the blocking wall 132c. At this time, the velocity of the gas is decelerated and the electrolyte contained in the gas aggregates while turning. The agglomerated electrolyte drops to the lower part and is recovered to the receiving part again. That is, only gas in which the electrolyte is not included in the upper end of the gas pocket part 132 is collected.

(f) In the gas discharge step, as illustrated in FIG. 6, the gas pocket part 132 is cut on the blocking wall 132c to form the discharge port 132b. Then, the gas collected on the gas pocket 132 is discharged to the outside through the discharge port 132b.

Thereafter, the secondary battery 100 is completed by sealing the gas pocket 132 in which the inlet 132a is located by sealing it with heat and pressure.

Hereinafter, in describing other embodiments according to the present invention, the same reference numerals are used for components having the same configuration and function as the above-described embodiment, and overlapping descriptions are omitted.

[Gas Pocket Part According to Second Embodiment]

As illustrated in FIG. 7, the gas pocket part 132A according to the second embodiment forms a blocking wall 132c 'between the inlet 132a and the outlet 132b, and the blocking wall 132c' Two or more can be formed.

In this case, the two or more blocking walls 132c 'may be provided in a zigzag form at regular intervals, thereby allowing the gas introduced from the inlet 132a to turn in a zigzag to more easily separate the electrolyte contained in the gas. This can significantly prevent the discharge of the electrolyte.

[Gas pocket part according to the third embodiment]

As shown in FIG. 8, in the gas pocket part 132B according to the third embodiment, a blocking wall 132c ″ is formed between the inlet 132a and the discharge port 132b, and the blocking wall 132c ″ is formed. When viewed along the longitudinal direction, it can be formed in any one of a straight line, a wave form and irregularities. That is, referring to FIG. 8 as an example, the blocking wall 132c is formed in a wave shape, and the gas impinging on the blocking wall 132c can also flow in an up-down direction along the wave shape, and thus the electrolyte solution contained in the gas. Can be separated more easily, and the discharge of the electrolyte solution can be prevented remarkably.

[Gas Pocket Part 132C According to Embodiment 4]

In the gas pocket 132C according to the fourth embodiment, as shown in FIG. 9, a blocking wall 132c ″ ′ is formed between the inlet 132a and the outlet 132b, and the blocking wall 132c ″ ′ is formed. ) Is formed to be inclined downward toward the other end opposite to one end connected to one side of the gas pocket part 132C. That is, by turning the gas collided with the blocking wall 132c downward while increasing the cohesive force of the electrolyte contained in the gas, it is possible to easily separate the electrolyte from the gas, thereby significantly preventing the discharge of the electrolyte Can be.

[Gas Pocket Part 132D According to Embodiment 5]

As shown in FIG. 9, the gas pocket part 132D according to the fifth embodiment has a blocking wall 132c ″ ″ formed between the inlet 132a and the discharge port 132b, and the blocking wall 132c ″ ″. ), One or more fine holes 132c-1 are formed.

That is, the gas pocket part 132D according to the fifth embodiment includes a gas pocket part in which a gas turning through the blocking wall 132c ″ ″ and a gas passing through the hole 132c-1 are located at the outlet 132b. 132) while colliding at the top, it is possible to further increase the cohesion of the electrolyte contained in the gas, the electrolyte can be easily separated from the gas as the aggregated electrolyte is easily separated from the gas, thereby preventing the discharge of the electrolyte significantly.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

100: secondary battery
110: electrode assembly
120: electrolyte
130: case
131: receptacle
132: gas pocket portion

Claims (13)

An electrode assembly, an electrolyte solution, and a case accommodating the electrode assembly and the electrolyte solution, wherein the case includes:
An accommodation part accommodating the electrode assembly and the electrolyte solution;
A gas pocket part disposed above the accommodation part and including an inlet for introducing a gas generated in the accommodation part by mutual reaction of the electrode assembly and the electrolyte, and a discharge port for discharging the gas collected through the inlet to the outside; ,
The gas pocket portion is formed with a blocking wall for inducing to be discharged through the discharge port after turning the gas introduced from the inlet,
The inlet and the outlet are formed to correspond to the one side portion of the gas pocket portion in the vertical direction,
One end of the barrier wall is connected to one side of the gas pocket part, and the other end extends between the inlet and the outlet, and blocks the inlet and the outlet.
The blocking wall is formed by sealing the gas pocket portion between the inlet and the outlet,
At least one minute hole is formed in the blocking wall. delete delete delete The method according to claim 1,
The blocking wall is a secondary battery characterized in that the inclined downward gradually from one end to the other end. The method according to claim 1,
Secondary battery, characterized in that provided with a zigzag form at regular intervals when the two or more blocking walls. The method according to claim 1,
The blocking wall has a secondary battery, characterized in that it has any one of a straight form, irregularities and wavy form. delete (a) preparing a case provided with a gas pocket part having an accommodating part accommodating an electrode assembly, an inlet connected to the accommodating part and an opening connected to the outside;
(b) fixing the case with the gas pocket part facing upwards, and injecting electrolyte into the receiving part through an opening provided in the gas pocket part;
(c) sealing and closing the opening when the electrolyte solution is injected;
(d) sealing a side portion of the gas pocket portion positioned above the inlet in the width direction to form a barrier wall;
(e) charging and discharging by applying a voltage to an electrode assembly accommodated in the case; And
(f) when the charging and discharging is completed, cutting the gas pocket part positioned on the blocking wall to form a discharge hole,
The gas generated in the accommodating part by the step (e) flows into the gas pocket part through the inlet port and is turned along the wall surface of the blocking wall and then discharged to the discharge port.
The inlet and the outlet are formed to correspond to the one side portion of the gas pocket portion in the vertical direction,
The blocking wall has one end connected to one side of the gas pocket part, and the other end extends between the inlet and the outlet, and blocks the inlet and the outlet.
The blocking wall is formed by sealing the gas pocket portion between the inlet and the outlet,
One or more fine holes are formed in the blocking wall. The method according to claim 9,
The method of manufacturing a secondary battery, characterized in that step (c) and step (d) are performed at the same time. delete delete delete

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