KR100416099B1 - Case for secondary battery and method for manufacturing secondary battery package using this - Google Patents

Abstract

The secondary battery case according to the present invention includes a first space forming part provided with a first space for accommodating an electrode assembly therein and a gas flow path for collecting gas generated during charging and discharging of the electrode assembly. A second space forming unit provided with a second space connected to the first space forming unit and

And a gas adsorbent made of a gas adsorbent material in the second space.

Description

Case for secondary battery and method for manufacturing secondary battery package using this}

The present invention relates to a secondary battery case and a method for manufacturing a secondary battery package using the same, and more particularly, a pouch type secondary battery case having a means for collecting more gas generated during initial charge and discharge of the secondary battery. And it relates to a method of manufacturing a secondary battery package using the same.

Secondary battery refers to a battery that can be charged and discharged. Recently, with the rapid development of the electric, electronic, communication, and computer industries, the demand for a high-performance, high-safety lithium secondary battery is increasing. Development is underway.

The lithium secondary battery has been developed to use a pouch type case from using a metal sealed container to meet the demand for light weight. However, the lithium secondary battery having the pouch-type case has a problem of causing a breakdown of the battery package itself or a failure of an electronic device because the case may expand and rupture when gas is generated due to overcharge or the like.

Accordingly, a method of collecting and removing gas generated after so-called 'aging' to initially charge and discharge the battery package is used. FIG. 1 is an example of a secondary battery package including a conventional pouch type secondary battery case for this purpose. It is a partial cutaway perspective view.

In the conventional secondary battery package, an electrode assembly 11 and an electrolyte (not shown) are provided as a power generation element. The power generation elements are inserted into the first space inside the first space forming part 11 of the secondary battery case 10 so that the negative electrode and the positive electrode leads 31 and 32 protrude outward. The first space is defined by a lower surface 13 that is retracted to include an electrode assembly 11 and a side surface 14 and an upper surface 12 extending upward from the side of the lower surface. The flange formed on the side edge and the edge of the upper surface is provided with a heat fusion portion 15 that is thermally bonded to each other.

One side of the first space forming part 11 is provided with a second space forming part 21 having a second space for collecting the gas generated during aging of the secondary battery. The first space forming part 11 and the second space forming part 21 are integrally formed. The second space is defined by the retracted lower surface 23 and the side surface 24 and the upper surface 22 extending upward from the side of the lower surface. Like the first space forming portion, the flange formed at the edge of the side surface 24 and the edge of the upper surface 22 is provided with a heat fusion portion 25 that is thermally bonded to each other. The heat-sealed portions 15 and 25 between the first space forming portion and the second space forming portion may be shared with each other, and a gas flow path 19 is formed to communicate the first space and the second space with each other. . The gas passage 19 is provided by intentionally excluding heat fusion.

When gas is collected in the second space after aging, the gas flow path 19 is heat-sealed to isolate the first space and the second space, cut along the cutting line C, and then the second space forming part 21 is removed. After removal, the secondary battery package is completed.

In manufacturing the secondary battery package as described above, the second space is already filled with air and there is a limit to the expansion of the second space forming portion 21, which is usually made of metal, which is satisfactory to capture the gas generated during aging. There is a problem that it is difficult to achieve the effect.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a secondary battery case and a method for manufacturing a secondary battery package using the same, which can sufficiently collect gas generated during aging.

In addition, it aims to prevent failure or explosion during operation of the secondary battery package manufactured through this.

1 is a partial cutaway perspective view showing an example of a secondary battery package having a conventional secondary battery case.

Figure 2 is a partial cutaway perspective view showing a secondary battery package having a secondary battery case according to the present invention.

3 is a flowchart illustrating a method of manufacturing a secondary battery package according to the present invention.

<Brief description of symbols for the main parts of the drawings>

10,100 ... secondary battery case 11,110 ... first space forming part

19,190 ... Gas flow path 21,210 ... Second space forming part

290 ... gas sorbent 30,300 ... electrode assembly

31,32,310,320 ... electrode leads C, C '...

In order to achieve the above technical problem, a secondary battery case according to the present invention includes a first space forming unit provided with a first space for accommodating an electrode assembly therein, and gas generated during charging and discharging of the electrode assembly. And a second space forming portion for collecting the second space having a predetermined gas flow path and connected to the first space forming portion.

And a gas adsorbent made of a gas adsorbent material in the second space.

In the case for a secondary battery according to the present invention, the gas adsorbent is characterized in that it is cured after mixing the gas adsorbent material and the resin material.

In a preferred embodiment of the secondary battery case according to the present invention, the gas-adsorbent material is characterized in that the porous metal oxide, the porous metal oxide is zeolite, silica gel, alumina, molecular, or among them It may be one of a group of two or more mixtures.

In another preferred embodiment of the secondary battery case according to the present invention, the gas adsorption material is characterized in that the porous carbon material, the porous carbon material is a carbon molecular, activated carbon, or a mixture thereof It can be one of a group.

In another preferred embodiment of the secondary battery case according to the present invention, the gas adsorption material is nickel (Ni), platinum (Pt), palladium (Pd), calcium (Ca), strontium (Sr), barium (Ba ), Thallium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), or these It may be one of a group of two or more mixtures.

The secondary battery package manufacturing method according to the present invention includes a first space forming unit having a first space for accommodating an electrode assembly therein, and a second space forming having a second space connected to the first space forming unit. Preparing a pouch type secondary battery case, characterized in that it comprises a gas adsorbent made of a gas adsorbent material in the second space;

Positioning an electrode assembly in the first space;

Heat-sealing and sealing the secondary battery case except for a predetermined gas movement path between the first space forming unit and the second space forming unit;

Initially charging and discharging the electrode assembly and collecting gas into the second space;

Heat-sealing and sealing a predetermined gas movement path of the secondary battery case; and

And cutting the heat-sealed portion between the first space forming portion and the second space forming portion and removing the second space forming portion.

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

Figure 2 is a partial cutaway perspective view showing a secondary battery package having a secondary battery case according to the present invention.

Referring to the drawings, the secondary battery case 100 may include a first space forming unit 110 in which a first space into which an electrode assembly 300 and an electrolyte (not shown) are inserted, and a gas generated during aging are collected. The second space forming portion 210 is provided with two spaces. The electrode assembly 300 is formed by stacking electrode active materials such as a separator, an anode, and a cathode in a predetermined order, and cathode and anode leads 310 and 320 extend to one side to protrude out of the case 100.

The first space is defined by a lower surface 130 having a rectangular plate shape, a side surface 140 extending from the side surface, and an upper surface 120. The upper edge of the side surface 140 is refracted to form a flange, and heat-sealed with the edge of the upper surface 120 to form a heat-sealed portion 150. The upper surface, the side surface, and the lower surface are integrally formed, and the electrode assembly 300 is located on the lower surface, and then the upper surface is folded up and heat-sealed to seal.

Like the first space, the second space is defined by the lower surface 230, the side surface 240, and the upper surface 220, and is sealed by thermal fusion of the thermal fusion unit 250. The heat welding parts 150 and 250 between the first space forming part 110 and the second space forming part 210 may be substantially shared and intentionally exclude heat welding by a predetermined range to form the gas flow path 190. do. Reference numeral C 'denotes a cutting line as a reference when cutting between the first space forming portion and the second space forming portion.

The second space is provided with a gas adsorbent to collect as much gas as possible during aging. The gas adsorbent is composed of a porous material and may be composed of a single material or a mixture. It is not fixed in the second space in the form of a powder, or is cured after mixing the porous material with a resin material such as polyethylene, polypropylene, polyvinylidene fluoride, polyimide, polyamide, epoxy resin, acrylic resin, etc. Can be processed into a constant shape and placed in the second space.

The porous material used as the intake material may be a metal oxide such as zeolite, silica gel, alumina, or molecular sieve, or a carbon material such as carbon molecular sieve or activated carbon, or may be a mixture of two or more of the above materials. have. Or nickel (Ni), platinum (Pt), palladium (Pd), calcium (Ca), strontium (Sr), barium (Ba), thallium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V) , Niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), and the like.

3 is a flowchart illustrating a method of manufacturing a secondary battery package according to the present invention.

Referring to the drawings, a method of manufacturing a secondary battery package includes preparing a pouch type secondary battery case having a first and second space forming parts as a first step and a gas adsorbent in a second space of the second space forming part. (S110). Since the secondary battery case is mentioned in detail in FIG. 2, the description thereof is omitted.

As a second step, it includes the step (S120) for placing the electrode assembly and the electrolyte as the power generation element in the first space of the secondary battery case.

The third step is to fold the upper surface of the first space forming portion and the second space forming portion formed integrally and to seal the edge by heat-sealing, but to exclude the heat fusion by a predetermined range between the first space and the second space gas flow path Forming step (S130).

The fourth step is a step of initially charging and discharging the power generation element in the secondary battery case, and collecting the generated gas in the second space (S140).

In the fifth step, the gas flow path is heat-sealed and sealed.

As a sixth step, the first space forming part and the second space forming part are cut off and the second space forming part is removed to leave only the first space forming part. As a conventional post-process, a secondary battery package may be completed by interposing a circuit for stabilizing a current in the first space forming unit and inserting it in a hard case.

The secondary battery case and the method of manufacturing a secondary battery package using the same provided by the present invention as described above allow to remove more gas generated during aging after collection.

In addition, by easily discharging the gas in the space in which the electrode assembly is inserted, it is possible to prevent the leakage of the electrolyte due to the poor appearance of the secondary battery case, the breakage of the heat-sealed portion due to the gas.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (8)

A first space forming portion provided with a first space for accommodating the electrode assembly, and for collecting gas generated during charging and discharging of the electrode assembly, the first space forming portion having a predetermined gas movement path A second space forming part provided with a second space connected thereto; A pouch-type secondary battery case comprising a gas adsorbent made of a gas adsorbent material in the second space. The method of claim 1, The gas adsorbent is a secondary battery case, characterized in that the hardening after mixing the gas adsorbent material and the resin material. The method according to claim 1 or 2, The gas adsorption material is a secondary battery case, characterized in that the porous metal oxide. The method of claim 3, wherein The porous metal oxide is a secondary battery case, characterized in that one of the group consisting of zeolite, silica gel, alumina, molecular sieve, or a mixture of two or more thereof. The method according to claim 1 or 2, The gas adsorption material is a secondary battery case, characterized in that the porous carbon material. The method of claim 5, The porous carbon material is a secondary battery case, characterized in that one of the group consisting of carbon molecular, activated carbon, or a mixture thereof. The method according to claim 1 or 2, The gas-adsorbable material is nickel (Ni), platinum (Pt), palladium (Pd), calcium (Ca), strontium (Sr), barium (Ba), thallium (Ti), zirconium (Zr), hafnium (Hf), Secondary, characterized in that it is one of the group of vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), or a mixture of two or more thereof Battery case. A first space forming unit having a first space therein for accommodating the electrode assembly, and a second space forming unit having a second space in contact with the first space forming unit, and having a gas adsorption property in the second space. Preparing a pouch type secondary battery case comprising a gas adsorbent made of a material; Positioning an electrode assembly in the first space; Heat-sealing and sealing the secondary battery case except for a predetermined gas movement path between the first space forming unit and the second space forming unit; Initially charging and discharging the electrode assembly and collecting gas into the second space; Heat-sealing and sealing a predetermined gas movement path of the secondary battery case; and And cutting the heat-sealed portion between the first space forming portion and the second space forming portion and removing the second space forming portion.