KR20220142881A - Secondary battery and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a secondary battery in which an electrolyte impregnation capability is improved and performance degradation of the secondary battery may be prevented. More specifically, the secondary battery comprises: an electrode assembly; a pouch having an accommodation unit in which the electrode assembly is accommodated, a gas pocket unit which is located at an upper side of the accommodation unit and in which an injection terminal is formed, and a sealing unit for sealing the gas pocket unit, except for the injection terminal, and an edge surface of the accommodation unit; and an electrolyte with which the electrode assembly is primarily impregnated as the electrolyte is injected into the pouch, wherein the pouch includes an electrolyte storage unit which is formed in the gas pocket unit, has formed therein an electrolyte storage space for storing the electrolyte, and has an opened surface formed with a material that is removed after a preset time while being gradually melted by the stored electrolyte, wherein the electrolyte stored in the electrolyte storage unit is secondarily injected into the accommodation unit through a hole formed by removing the opened surface, and allows the electrode assembly to be secondarily impregnated therewith.

Description

Secondary battery and manufacturing method thereof

The present invention relates to a secondary battery and a method for manufacturing the same, and more particularly, to a secondary battery having a structure that can be impregnated in an electrode assembly by dividing an electrolyte injected into a pouch a plurality of times, and to a method for manufacturing the same.

In general, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Such secondary batteries are widely used in high-tech electronic devices such as phones, notebook computers, and camcorders.

The secondary battery is classified into a can-type secondary battery in which the electrode assembly is embedded in a metal can, and a pouch-type secondary battery in which the electrode assembly is embedded in a pouch. The can-type secondary battery includes an electrode assembly, an electrolyte, a can for accommodating the electrode assembly and the electrolyte, and a cap assembly mounted in an opening of the can. And the pouch-type secondary battery includes an electrode assembly, an electrolyte, and a pouch accommodating the electrode assembly and the electrolyte.

On the other hand, the pouch-type secondary battery manufacturing method includes the steps of preparing an electrode assembly, accommodating the electrode assembly in a pouch, injecting electrolyte into the pouch to impregnate the electrode assembly, and sealing the opening of the pouch to complete the secondary battery includes

Here, in the electrolyte injection step, the electrolyte is injected so that the entire electrode assembly accommodated in the pouch is covered, and accordingly, the electrolyte is gradually impregnated from the entire outer circumferential surface of the electrode assembly (ie, the entire edge surface of the electrode assembly) toward the central portion (ie, the center of the electrode assembly). do.

However, in the conventional electrolyte injection step, since the electrolyte covers the entire electrode assembly accommodated in the pouch, there is a problem in that bubbles or gases remaining inside the electrode assembly cannot be discharged out of the electrode assembly. That is, as the bubbles or gases remaining inside the electrode assembly gather in the central portion of the electrode assembly, the electrolyte impregnating power decreases, and as a result, there is a problem in that the performance of the secondary battery is deteriorated.

The patent document is No. 10-2007-0108761.

The problem to be solved by the present invention is that by improving the pouch, the electrolyte injected into the pouch can be divided into a plurality of times and impregnated into the electrode assembly. An object of the present invention is to provide a secondary battery capable of effectively discharging air bubbles or gases, thereby increasing the electrolyte impregnation power and preventing secondary battery performance deterioration, and a method for manufacturing the same.

The secondary battery of the present invention includes an electrode assembly; a pouch having a receiving portion in which the electrode assembly is accommodated, a gas pocket portion positioned above the receiving portion and having an injection hole formed therein, and a sealing portion sealing the gas pocket portion excluding the injection hole and an edge surface of the accommodation portion; and an electrolyte solution that is primarily impregnated into the electrode assembly while being injected into the pouch, wherein the pouch is formed in the gas pocket portion, an electrolyte storage space for storing the electrolyte is formed, and is gradually melted by the stored electrolyte. and an electrolyte storage unit having an open surface formed of a material that is removed after a period of time, wherein the electrolyte stored in the electrolyte storage unit is injected into the receiving portion through a hole formed while the open surface is removed and injected into the electrode assembly secondarily can be impregnated.

The electrolyte storage part may be formed as an open surface that is partially melted by the electrolyte and removed after a set time.

The electrolyte storage part is provided to be connected to the sealing part sealing the side of the gas pocket part and is provided in a storage surface in which an electrolyte storage space is formed, and in a space between the storage surface and the sealing part between the storage surface and the sealing part. It includes an open surface to be closed, and the electrolyte stored in the electrolyte storage unit may be injected into the receiving portion through the space between the storage surface and the sealing portion while the open surface is removed.

The electrolyte storage unit may be formed as an open surface that is removed after a set time while the whole is gradually melted by the electrolyte.

The electrolyte solution primarily impregnated in the electrode assembly has an amount that does not cover the entire electrode assembly accommodated in the accommodating part, and the electrolyte stored in the electrolyte storage part has an amount that can cover the entire electrode assembly accommodated in the accommodating part can

The open surface is formed of a polymer material that is gradually melted by the electrolyte and removed after a set time, and the polymer material may be a hydrophilic polymer.

On the other hand, the secondary battery manufacturing method of the present invention comprises the steps of: (a) preparing an electrode assembly, an electrolyte, and a pouch, wherein the pouch includes an electrode assembly accommodating part and a gas pocket part; (b) accommodating the electrode assembly in the accommodating part of the pouch, and then sealing the edge surfaces of the gas pocket part and the accommodating part excluding the injection hole of the gas pocket part to form a sealing part; (c) manufacturing an electrolyte storage unit having an electrolyte storage space formed on a surface of the gas pocket, wherein the electrolyte storage unit includes an open surface formed of a material that is gradually melted by the stored electrolyte and removed after a set time; (d) first impregnating the electrode assembly by injecting the accommodating part and the electrolyte through the injection hole of the gas pocket part, and injecting the electrolyte into the electrolyte storage part to store the electrolyte; and (e) the open surface is gradually melted by the electrolyte stored in the electrolyte storage unit, and the open surface is removed after a set time, and the electrolyte stored in the electrolyte storage unit is injected into the receiving unit through a hole formed while the open surface is removed. Secondary impregnation in the electrode assembly may include.

The open surface may be formed of a polymer material.

In the step (c), an electrolyte storage part connected to the sealing part sealing the side part of the gas pocket part may be manufactured.

In step (c), the electrolyte storage unit is formed of a storage surface and an open surface, and the storage surface is manufactured to form an electrolyte storage space by pressing the surface of the gas pocket portion with heat, and the open surface is stored The space between the surface and the sealing part may be filled with a material that is gradually melted and removed by the electrolyte so that the space between the storage surface and the sealing part is closed.

In the step (c), the electrolyte storage part is formed as an open surface as a whole, and the open surface is manufactured by filling the inside of the gas pocket part with a material that is gradually melted and removed by the electrolyte, so that an electrolyte storage space is formed. have.

In step (d), the electrolyte injection amount may be adjusted so that the entire electrode assembly accommodated in the receiving portion is not covered with the electrolyte.

In step (e), the storage amount of the electrolyte stored in the electrolyte storage unit may be adjusted so that the entire electrode assembly accommodated in the accommodation unit is covered.

After the step (e), (f) manufacturing an uncharged secondary battery by sealing the inlet of the gas pocket; (g) charging and discharging the uncharged secondary battery to activate the secondary battery; (h) discharging the gas collected in the gas pocket in step (g) to the outside; and (i) sealing the accommodating part by sealing between the accommodating part and the gas pocket part, and cutting the gas pocket part connected to the sealing part between the gas pocket part and the accommodating part to manufacture a finished secondary battery. can do.

The open surface, by increasing or decreasing the thickness in the direction toward the receiving part, the set time for being melted and removed by the electrolyte can be adjusted.

The open surface may be made of a polymer material, and the polymer material may be a hydrophilic polymer that is gradually dissolved by an electrolyte.

The secondary battery and its manufacturing method of the present invention can induce the electrolyte to be injected into the pouch to be divided and injected multiple times by including an electrolyte storage unit having an open surface that is gradually melted and removed by the electrolyte, and accordingly, a plurality of electrode assemblies It can be impregnated through several times, and as a result, bubbles or gases remaining in the electrode assembly can be effectively discharged, thereby increasing the electrolyte impregnation power and preventing deterioration of secondary battery performance.

1 is a front view showing a secondary battery according to a first embodiment of the present invention.
2 is a cross-sectional view showing a state of being impregnated with a primary electrolyte of a secondary battery according to a first embodiment of the present invention;
3 is a cross-sectional view showing a secondary electrolyte impregnated state of the secondary battery according to the first embodiment of the present invention.
4 is a flowchart illustrating a method for manufacturing a secondary battery according to a first embodiment of the present invention.
5 is a cross-sectional view illustrating steps (a) and (b) of a method for manufacturing a secondary battery according to a first embodiment of the present invention.
6 is a cross-sectional view illustrating step (c) of a method for manufacturing a secondary battery according to a first embodiment of the present invention.
7 is a cross-sectional view illustrating step (d) of a method for manufacturing a secondary battery according to a first embodiment of the present invention.
8 is a cross-sectional view illustrating step (e) of a method for manufacturing a secondary battery according to a first embodiment of the present invention.
9 is a cross-sectional view illustrating step (f) of a method for manufacturing a secondary battery according to a first embodiment of the present invention.
10 is a cross-sectional view illustrating step (i) of a method for manufacturing a secondary battery according to a first embodiment of the present invention.
11 is a cross-sectional view illustrating a secondary battery according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

[Secondary battery according to the first embodiment of the present invention]

As shown in FIGS. 1 to 3, the secondary battery 100 according to the first embodiment of the present invention is injected into the electrode assembly 110, the pouch 120, and the pouch 120, and the electrode assembly ( 110) and the electrolyte 130 impregnated therein.

electrode assembly

The electrode assembly 110 has a structure in which electrodes and separators are alternately stacked, and the electrode includes a first electrode and a second electrode. A first electrode tab is provided on the first electrode, and a second electrode tab is provided on the second electrode. Meanwhile, the first electrode is an anode, and the second electrode is a cathode. Of course it could be the other way around.

pouch

The pouch 120 is located on the lower side as seen in FIG. 1 and is located on the receiving part 121 in which the electrode assembly 110 is accommodated, and is located on the upper side of the receiving part 121 as seen in FIG. 1 and is connected to the receiving part 121 . A sealing for sealing the gas pocket portion 122 having an injection hole formed therein, and the edge surfaces of the gas pocket portion 122 and the receiving portion 121 excluding the injection hole (left and right and lower surfaces of the pouch when viewed in FIG. 1 ) part 123 .

On the other hand, the pouch 120 is a structure before the secondary battery is completed, and when the secondary battery is completed, the pouch 120 includes only the receiving part 121 and the sealing part 123 while the gas pocket part 122 is removed. have a structure

Here, the gas pocket unit 122 serves to collect the gas generated in the accommodating unit 121 after charging and discharging the secondary battery and discharge the gas to the outside.

electrolyte

The electrolyte 130 is impregnated into the electrode assembly 110 while being injected into the receiving portion 121 through the inlet of the gas pocket portion 122 , thereby improving the performance of the electrode assembly 110 .

That is, the electrolyte 130 is primarily impregnated into the electrode assembly 110 while being injected into the pouch 120 .

Meanwhile, in the secondary battery 100 , when the electrolyte is injected into the receiving part 121 of the pouch 120 , the entire electrode assembly 110 is covered with the electrolyte 130 . At this time, the bubbles remaining in the electrode assembly 110 . Alternatively, there may be a problem in the electrolyte impregnating power as the gas is not discharged to the outside.

In the present invention, by improving the structure of the pouch in order to solve the above problems, the electrolyte can be adjusted to be injected multiple times into the receiving part of the pouch, and thus the electrode assembly 110 accommodated in the receiving part can be adjusted multiple times. The electrolyte may be impregnated, and as a result, bubbles or gases remaining in the electrode assembly 110 may be effectively discharged to increase the electrolyte impregnating power.

For example, the pouch 120 is provided in the gas pocket unit 122 , an electrolyte storage space for storing the electrolyte 130 is formed, and the material is gradually melted by the stored electrolyte 130 and removed after a set time. It includes an electrolyte storage unit 124 having an open surface (124b) formed of.

That is, when the pouch 120 stores the electrolyte 130 in the electrolyte storage unit 124 , the open surface 124b is gradually melted by the electrolyte 130 stored in the electrolyte storage unit 124 for a set time. After removal, the electrolyte 130 stored in the electrolyte storage unit 124 through the hole 124c formed while the open surface 124b is removed is injected into the receiving portion 121 to the electrode assembly 110. It can be impregnated twice.

Here, the electrolyte storage unit 124 may be formed as an open surface 124b, a part of which is gradually melted by the electrolyte 130 and removed after a set time. That is, the electrolyte storage part 124 is provided to be connected to the sealing part 123 sealing the side part (the right part of the gas pocket part when viewed in FIG. 1) of the gas pocket part 122, and an electrolyte storage space is formed. and an open surface 124b provided in the space between the storage surface 124a and the storage surface 124a and the sealing part 123 and closing between the storage surface 124a and the sealing part 123 .

As shown in FIG. 2 , the pouch 120 having such a structure injects the electrolyte 130 into the receiving part 121 of the pouch 120 , and the electrolyte 130 into the electrolyte storage part 124 together with this. ) is injected and stored.

Here, the electrolyte 130 injected into the accommodating part 121 is first impregnated into the electrode assembly 110, and at this time, the electrolyte 130 primarily injected into the accommodating part 121 is covered by the electrode assembly 110 as a whole. It has an injection volume that is not Accordingly, the electrolyte primarily injected into the receiving part is impregnated through both sides and the lower side of the electrode assembly 110 as shown by the arrows shown in FIG. 2 , and as a result, the bubbles or gases remaining inside the electrode assembly 110 is discharged to the outside through the upper portion of the electrode assembly (110). That is, since the upper portion of the electrode assembly 110 is not covered with the electrolyte 130 , the bubbles or gas remaining in the electrode assembly 110 may be discharged to the outside.

On the other hand, the electrolyte 130 stored in the electrolyte accommodating part 124 gradually melts the open surface 124b as shown in FIG. A hole 124c is formed as it is completely melted and removed by the The electrode assembly 110 is secondarily impregnated. At this time, the electrolyte 130 stored in the electrolyte storage surface 124a has a storage amount capable of covering the entire electrode assembly 110 accommodated in the receiving unit. Accordingly, the electrolyte can be stably impregnated up to the upper portion of the electrode assembly 110 from which the gas is discharged.

On the other hand, the storage surface 124a may be formed by compressing the surface of the gas pocket part 122 with heat except for the portion where the open surface 124b is formed, and the open surface 124b is the gas pocket part 122 . When forming the storage surface 124a from the inside, it may be formed by filling a material that is melted by an electrolyte in a portion that is not compressed.

On the other hand, the electrolyte storage unit 124 is provided on one side of the gas pocket for ease of injection of the electrolyte into the gas pocket. That is, the electrolyte storage unit 124 is provided on the right side of the gas pocket as seen in FIG. 1 , and thus the electrolyte can be stably injected through the left side of the gas pocket.

In particular, in the electrolyte storage unit 124 , the open surface 124b is formed between the storage surface 124a and the sealing portion 123 when viewed in FIG. 1 . Accordingly, when the open surface 124b is melted and removed, a hole 124c is formed between the storage surface 124a and the sealing part 123, and the electrolyte 130 stored in the electrolyte storage part 124 is the hole 124c. and along the inner surface of the sealing part 123 , are injected into the receiving part 121 . That is, the electrolyte 130 stored in the electrolyte storage unit 124 may be induced to be injected through the side surface of the pouch, and accordingly, the electrolyte is gradually filled in the receiving portion and the electrolyte is impregnated from the bottom to the top of the electrode assembly. can do it As a result, bubbles or gases remaining in the electrode assembly can be more effectively discharged.

Meanwhile, the open surface may be formed of a polymer material. In particular, the open surface may be formed of 10,000 or more, preferably 50,000 or more polymer materials. Also, the open surface may be a hydrophilic polymer, and the hydrophilic polymer is referred to as a high molecular polymer, that is, a hydrophilic resin. For example, the polymer material is poly acrylate, polyester, polyvinyl acetate, polyvinyl alcohol, polyacrylic acid, polyvinylpyridine. (poly vinyl pyridine), it may be any one of polyamide (poly amaide).

That is, as the open surface of the polymer material is melted by the electrolyte or a solvent contained in the electrolyte, a hole may be stably formed in the electrolyte storage unit 124 .

On the other hand, the open surface of the polymer material can be removed by melting even above the set temperature or above the set voltage. Accordingly, after injecting the electrolyte into the electrolyte storage, the pouch is raised to the set temperature or higher after the set time or higher than the set voltage. As it is applied, the open surface remaining in the electrolyte storage unit can be completely removed.

Therefore, the secondary battery 100 according to the first embodiment of the present invention includes a pouch having an electrolyte storage unit, thereby increasing the electrolyte impregnating power of the electrode assembly, and effectively removing bubbles or gases remaining in the electrode assembly. , As a result, the electrolyte impregnating power can be increased, and deterioration of the performance of the secondary battery can be prevented.

Hereinafter, a method for manufacturing a secondary battery according to the first embodiment of the present invention having the above structure will be described.

[Method for manufacturing secondary battery according to the first embodiment of the present invention]

As shown in FIGS. 4 to 10, the secondary battery manufacturing method according to the first embodiment of the present invention includes (a) preparing an electrode assembly 110, an electrolyte 130, and a pouch 120, ( b) accommodating the electrode assembly 110 in the pouch 120, (c) preparing an electrolyte storage unit in the pouch, (d) electrolyte first impregnation step, (e) electrolyte secondary impregnation step, (f) It includes an uncharged secondary battery manufacturing step, (g) an activation step, (h) a degassing step, and (i) a finished secondary battery manufacturing step.

In step (a), the electrode assembly 110 , the electrolyte 130 , and the pouch 120 are prepared. Here, the pouch 120 has a structure in which the receiving part 121 for accommodating the electrode assembly 110 and the gas pocket part 122 for collecting gas are connected in the longitudinal direction.

In step (b), the electrode assembly 110 is accommodated in the receiving part 121 of the pouch 120 , and then the receiving part 121 and the gas pocket part 122 rim except for the inlet of the gas pocket part 122 . The sealing part 123 is formed by sealing the surface. On the other hand, after forming the sealing part, the electrode assembly may be accommodated in the accommodating part.

Step (c) manufactures an electrolyte storage unit 124 having an electrolyte storage space formed on the surface of the gas pocket unit 122, wherein the electrolyte storage unit 124 is gradually melted by the stored electrolyte and removed after a set time and an open surface 124b formed of a material.

That is, in step (c), the electrolyte storage unit 124 has a 'U' shape with an open top on the surface of the gas pocket unit 122 and a storage surface 124a for storing the electrolyte 130 is prepared. , the storage surface 124a is manufactured by heat-sealing the surface of the gas pocket except for a portion for forming an open surface. Then, a part of the storage surface 124a that is not heat-sealed is melted and removed by the electrolyte to fill the material to prepare the open surface 124b. Then, the electrolyte storage unit 124 may be manufactured. At this time, the open surface 124b becomes a hole 124c when it is removed by melting by the electrolyte.

On the other hand, the electrolyte storage unit 124 is manufactured to be connected to the sealing unit 123 sealing the side of the gas pocket unit 122 . That is, the electrolyte storage unit 124 is formed of a storage surface 124a and an open surface 124b, and the storage surface 124a stores the electrolyte solution by compressing the surface of the gas pocket portion 122 with heat. It is manufactured to form a space, and the open surface 124b fills the space between the storage surface 124a and the sealing part 123 with a material that is gradually melted and removed by the electrolyte to fill the storage surface 124a and the sealing part 123. ) ends between Then, the electrolyte stored in the electrolyte storage unit can be guided to flow along the inner vertical surface of the sealing unit.

On the other hand, the open surface, by increasing or decreasing the thickness in the direction toward the accommodating part can adjust the set time for melting and removing by the electrolyte.

Meanwhile, the open surface may be formed of a polymer material. In particular, the open surface may be formed of 10,000 or more, preferably 50,000 or more polymer materials. Also, the open surface may be a hydrophilic polymer. For example, the polymer material is poly acrylate, polyester, polyvinyl acetate, polyvinyl alcohol, polyacrylic acid, polyvinylpyridine. (poly vinyl pyridine), it may be any one of polyamide (poly amaide). That is, the open surface, which is a polymer material, is melted and removed by the electrolyte or a solvent contained in the electrolyte.

In step (d), the electrolyte 130 is injected into the receiving part 121 and the electrolyte storage part 124 through the inlet of the gas pocket part 122 . Then, the electrolyte 130 injected into the accommodating part 121 is first impregnated into the electrode assembly 110 , and the electrolyte injected into the electrolyte storage 124 is stored so as not to be injected into the accommodating part 121 . do.

Meanwhile, in the step (d), the electrolyte injection amount is adjusted so that the entire electrode assembly 110 accommodated in the accommodating part 121 is not covered by the electrolyte 130 .

Then, when the electrode assembly 110 is impregnated with the primary electrolyte, the bubbles or gas remaining in the electrode assembly 110 may be discharged through the upper portion of the electrode assembly.

In step (e), the open surface 124b is gradually melted by the electrolyte 130 stored in the electrolyte storage unit 124 . That is, the open surface 124b, which is a polymer material, is melted and removed after a set time by the electrolyte or a solvent contained in the electrolyte, and becomes a hole 124c, and the hole 124c is inserted into the electrolyte storage unit 124 through the hole 124c. As the stored electrolyte 130 is injected into the accommodating part 121 , the electrode assembly 110 is secondarily impregnated.

At this time, the electrolyte 130 stored in the electrolyte storage unit 124 flows along the sealing portion 123 located on the side of the pouch and gradually fills the receiving portion 121, and thus the electrode assembly 110 remains Bubbles or gases may be induced to be discharged to the upper side of the electrode assembly.

In particular, the injection amount of the electrolyte 130 stored in the electrolyte storage unit 124 is adjusted so that the entire electrode assembly accommodated in the receiving portion is covered, and accordingly, the electrolyte may be impregnated in the entire electrode assembly.

In step (f), an uncharged secondary battery is manufactured by sealing the inlet of the gas pocket unit 122 .

Step (g) is activated by charging or discharging an uncharged secondary battery. At this time, gas is generated inside the pouch.

In step (h), the gas generated inside the receiving part 121 of the pouch 120 is collected by the gas pocket part 122, and then a part of the gas pocket part 122 is cut to discharge the collected gas to the outside. .

In step (i), the accommodating part 121 is sealed by sealing between the accommodating part 121 and the gas pocket part 122 , and the sealing part between the gas pocket part 122 and the accommodating part 121 is sealed. Cut the gas pocket 122 connected to the . Then, the finished secondary battery 100 can be manufactured.

Hereinafter, in describing another embodiment of the present invention, the same reference numerals are used for components having the same functions and structures as those of the above-described embodiment, and overlapping descriptions are omitted.

[Secondary battery according to the second embodiment of the present invention]

As shown in FIG. 11 , the secondary battery 100 according to the second embodiment of the present invention is injected into the electrode assembly 110 , the pouch 120 , and the pouch 120 while being injected into the electrode assembly 110 . The electrolyte solution 130 is impregnated, and the pouch 120 includes a receiving portion 121 , a gas pocket portion 122 , a sealing portion 123 , and an electrolyte storage portion 124 .

Here, the electrolyte storage unit 124 may be formed as an open surface in which the whole is melted and removed after a set time by the electrolyte. Accordingly, the entire electrolyte 130 stored in the electrolyte storage unit 124 can be quickly injected into the receiving unit 121 .

That is, when only a portion of the electrolyte storage unit 124 is formed as an open surface, the electrolyte may remain in the electrolyte storage unit 124 . In order to prevent this, if the entire electrolyte storage unit 124 is formed as an open surface, the entire electrolyte storage portion is melted and removed by the electrolyte, so that the entire electrolyte stored in the electrolyte storage portion can be injected into the pouch.

The electrolyte storage unit 124 having such a structure may be manufactured by coating the inner surface of the gas pocket unit 122 with a material that is melted and removed by the electrolyte in a 'U' shape with an open top.

Therefore, the secondary battery 100 according to the second embodiment of the present invention can stably inject the secondary electrolyte into the receiving part.

[Method for manufacturing secondary battery according to the second embodiment of the present invention]

The secondary battery manufacturing method according to the second embodiment of the present invention comprises the steps of (a) preparing the electrode assembly 110, the electrolyte 130, and the pouch 120, (b) the electrode assembly 110 in the pouch 120. accommodating in, (c) preparing an electrolyte storage unit in the pouch, (d) electrolyte first impregnation step, (e) electrolyte secondary impregnation step, (f) uncharged secondary battery manufacturing step, (g) activation step , (h) a degassing step, and (i) a finished secondary battery manufacturing step.

Here, (c) preparing an electrolyte storage unit in the pouch, (d) electrolyte first impregnation step, (e) electrolyte secondary impregnation step, (f) uncharged secondary battery manufacturing step, (g) activation step, (h) The degassing step, (i) the finished secondary battery manufacturing step has a manufacturing method corresponding to that of the first embodiment.

Meanwhile, in step (c), an electrolyte storage unit 124 having an electrolyte storage space formed on the surface of the gas pocket unit 122 is manufactured, and the electrolyte storage unit 124 is gradually melted by the stored electrolyte for a set time. It includes an open surface formed of material that is then removed.

In particular, in the step (c), the electrolyte storage unit 124 is formed as an open surface as a whole, and the open surface is manufactured by filling the gas pocket portion with a material that is gradually melted and removed by the electrolyte. At this time, the electrolyte storage unit is manufactured to form an electrolyte storage space.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalent concepts are possible.

100: secondary battery
110: electrode assembly
120: pouch
121: receptacle
122: gas pocket part
123: sealing part
124: electrolyte storage unit
130: electrolyte

Claims (15)

electrode assembly;
a pouch having a receiving portion in which the electrode assembly is accommodated, a gas pocket portion positioned above the receiving portion and having an injection hole formed therein, and a sealing portion sealing the gas pocket portion excluding the injection hole and an edge surface of the accommodation portion; and
It includes an electrolyte solution that is primarily impregnated into the electrode assembly while being injected into the pouch,
The pouch includes an electrolyte storage portion provided in the gas pocket portion, an electrolyte storage space for storing an electrolyte, and an electrolyte storage portion having an open surface formed of a material that is gradually melted by the stored electrolyte and removed after a set time,
The electrolyte stored in the electrolyte storage unit is secondarily impregnated into the electrode assembly while being injected into the receiving portion through a hole formed while the open surface is removed. The method according to claim 1,
The electrolyte storage part is a secondary battery formed as an open surface, a part of which is gradually melted by the electrolyte and removed after a set time. 3. The method according to claim 2,
The electrolyte storage part is provided to be connected to the sealing part sealing the side of the gas pocket part and is provided in a storage surface in which an electrolyte storage space is formed, and in a space between the storage surface and the sealing part between the storage surface and the sealing part. including a closing open surface;
The electrolyte stored in the electrolyte storage unit is injected into the receiving portion through the space between the storage surface and the sealing portion while the open surface is removed. The method according to claim 1,
The electrolyte storage unit is a secondary battery formed with an open surface that is removed after a set time while the whole is gradually melted by the electrolyte. The method according to claim 1,
The electrolyte solution primarily impregnated into the electrode assembly has an amount that does not cover the entire electrode assembly accommodated in the receiving part,
The electrolyte stored in the electrolyte storage unit has an amount capable of covering the entire electrode assembly accommodated in the receiving unit. 5. The method according to claim 1 or 4,
The open surface is formed of a polymer material that is gradually melted by the electrolyte and removed after a set time,
The polymer material is a hydrophilic polymer (hydrophilic polymer) secondary battery. (a) preparing an electrode assembly, an electrolyte, and a pouch, wherein the pouch includes an electrode assembly accommodating part and a gas pocket part;
(b) accommodating the electrode assembly in the accommodating part of the pouch, and then sealing the edge surface of the gas pocket part and the accommodating part excluding the injection hole of the gas pocket part to form a sealing part;
(c) manufacturing an electrolyte storage unit having an electrolyte storage space formed on a surface of the gas pocket, wherein the electrolyte storage unit includes an open surface formed of a material that is gradually melted by the stored electrolyte and removed after a set time;
(d) first impregnating the electrode assembly by injecting the accommodating part and the electrolyte through the injection hole of the gas pocket part, and injecting the electrolyte into the electrolyte storage part to store the electrolyte; and
(e) the open surface is gradually melted by the electrolyte stored in the electrolyte storage unit, the open surface is removed after a set time, and the electrolyte stored in the electrolyte storage unit is injected into the receiving unit through a hole formed while the open surface is removed. A secondary battery manufacturing method comprising the step of secondary impregnation in the electrode assembly. 8. The method of claim 7,
In the step (c), a secondary battery manufacturing method of manufacturing an electrolyte storage unit connected to the sealing unit sealing the side of the gas pocket unit. 9. The method of claim 8,
In the step (c), the electrolyte storage unit is formed of a storage surface and an open surface,
The storage surface is manufactured to form an electrolyte storage space by compressing the surface of the gas pocket part with heat,
The open surface is a secondary battery manufacturing method in which the space between the storage surface and the sealing part is filled with a material that is gradually melted and removed by the electrolyte so that the space between the storage surface and the sealing part is closed. 9. The method of claim 8,
In the step (c), the electrolyte storage unit is formed with an open surface as a whole,
The open surface is manufactured by filling the inside of the gas pocket with a material that is gradually melted and removed by the electrolyte, and is manufactured to form an electrolyte storage space. 8. The method of claim 7,
In the step (d), the electrolyte injection amount is adjusted so that the entire electrode assembly accommodated in the accommodating part is not covered with the electrolyte solution. 8. The method of claim 7,
In the step (e), the storage amount of the electrolyte stored in the electrolyte storage portion is adjusted so that the entire electrode assembly accommodated in the accommodation portion is covered. 8. The method of claim 7,
After the step (e), (f) manufacturing an uncharged secondary battery by sealing the inlet of the gas pocket;
(g) charging and discharging the uncharged secondary battery to activate the secondary battery;
(h) discharging the gas collected in the gas pocket in step (g) to the outside; and
(i) sealing the accommodating part by sealing between the accommodating part and the gas pocket part, and cutting the gas pocket part connected to the sealing part between the gas pocket part and the accommodating part to manufacture a finished secondary battery Secondary battery manufacturing method. 8. The method of claim 7,
The open surface is a secondary battery manufacturing method in which the set time for melting and removing by the electrolyte is adjusted by increasing or decreasing the thickness in the direction toward the receiving part. 8. The method of claim 7,
The open surface is made of a polymer material,
The method for manufacturing a secondary battery, wherein the polymer material is a hydrophilic polymer that is gradually dissolved by an electrolyte.

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