KR102043865B1 - Secondary battery - Google Patents

Abstract

The present invention relates to a secondary battery for injecting an electrolyte solution therein.
In addition, the present invention is an electrode current collector, accommodates the electrode current collector therein, a case having an opening formed on one side and detachably coupled to the opening, including a hopper member for injecting an electrolyte into the case It is characterized by.

Description

Rechargeable battery {SECONDARY BATTERY}

The present invention relates to a secondary battery, and more particularly, to a secondary battery injecting an electrolyte solution therein.

Cells or batteries that generate electric energy through physical or chemical reactions of materials and supply power to the outside cannot obtain AC power supplied to buildings according to the living environment surrounded by various electric and electronic devices. It is used when DC power is needed.

Among such batteries, a primary battery and a secondary battery, which are chemical cells using chemical reactions, are generally used. The primary battery is a consumable battery, commonly referred to as a battery. In addition, the secondary battery is a rechargeable battery manufactured using a material that can be repeated a number of redox process between the current and the material, the power is charged when the reduction reaction to the material by the electric current, the oxidation reaction to the material When performed, the power is discharged. As the charge-discharge is repeatedly performed, electricity is generated.

Lithium secondary batteries may be divided into lithium metal batteries, lithium ion batteries, and lithium secondary batteries according to electrolyte types.

Here, the lithium secondary battery has an advantage that since the electrolyte is in a solid or gel form, even if the battery is damaged due to an accident, the electrolyte does not leak out and there is little risk of ignition or explosion, thereby ensuring stability and high energy efficiency.

In addition, there is no need to use a solid metal casing, it can be manufactured in various sizes and shapes according to the use, it can be produced in less than 3mm thickness, weight can be reduced by more than 30%, mass production and large battery manufacturing is possible. .

For this reason, lithium secondary batteries are currently commercialized and used in various fields.

Korean Unexamined Patent Publication No. 10-2013-0102807 discloses a conventional lithium secondary battery and a lithium secondary battery manufactured by the method.

In such a lithium secondary battery, a folding battery is poured into a pouch in a packaging process, and the electrolyte is poured into a pouch to be wetted and then charged and activated.

However, when the electrolyte is injected into the pouch, a hopper is used to inject the electrolyte.The rate of injecting the electrolyte is faster than the rate at which the electrode embedded in the pouch absorbs the electrolyte. There is a problem that volatilized.

When the electrolyte is volatilized in this way, the amount of the electrolyte required inside the pouch is insufficient, and thus the performance of the secondary battery is degraded.

In addition, when the electrolyte solution injected into the pouch is volatilized, the amount of the electrolyte remaining inside the pouch becomes inconsistent, causing non-uniformity between secondary batteries, which lowers the reliability of the product.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to provide a secondary battery that can prevent the scattering of the electrolyte solution injected into the inside.

A secondary battery according to the present invention includes an electrode current collector, a case in which the electrode current collector is accommodated therein, a case in which an opening is formed at one side, and a detachable coupling to the opening, and a hopper member for injecting an electrolyte solution into the case. It includes, one end of the hopper member 20 is formed with an inlet 21 is injected into the electrolyte, and the other end is coupled to the case 10 to deliver the electrolyte to the case 10, the inlet 21 An outlet 22 having a diameter smaller than) is formed, and the hopper member 20 has a screw thread 23 formed around the outlet 22 side, and the screw thread inside the opening 11 of the case 10. A screw thread corresponding to 23 is formed so that the hopper member 20 and the opening 11 of the case 10 are detachably screwed, and the opening 11 is provided to be spaced apart from the case 10. The case 10 through the neck 11a Is connected, it said case (10), the neck (11a) and the opening (11) is characterized in that it is connected integrally.

The hopper member may be hermetically coupled to the opening.

An inlet through which an electrolyte is injected is formed at one end of the hopper member, and an outlet having a diameter smaller than that of the inlet may be formed at the other end thereof so as to transfer the electrolyte to the case.

The exit of the hopper member and the opening may be the same diameter.

An outlet of the hopper member may be inserted into and coupled to the opening.

According to the present invention, it is possible to stably maintain the required amount of electrolyte by preventing the scattering of the electrolyte solution injected into the secondary battery.

According to the present invention, there is an effect of preventing the performance of the secondary battery by preventing the scattering of the electrolyte solution injected into the secondary battery.

According to the present invention, it is possible to prevent the scattering of the electrolyte solution injected into the secondary battery, thereby stably maintaining the performance of the secondary battery.

According to the present invention, there is an effect of preventing the scattering of the electrolyte solution injected into the secondary battery to ensure product reliability of the secondary battery.

1 is a configuration diagram schematically showing a rechargeable battery according to an embodiment of the present invention from the front.
2 is a configuration diagram showing only the case in FIG.
3 is a configuration diagram showing only the hopper member in FIG.
4 is a plan view of the hopper member of FIG. 3.
Figure 5 is a block diagram showing a hopper member according to another embodiment of the present invention.
Figure 6 is a block diagram showing a hopper member according to another embodiment of the present invention.
7 is an exploded view of a secondary battery according to still another embodiment of the present invention.
8 is a block diagram illustrating a secondary battery according to another embodiment of the present invention.

Hereinafter, a secondary battery according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In the drawings, the size of each component or a specific portion constituting the components is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Thus, the size of each component does not entirely reflect its actual size. If it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, such description will be omitted.

1 is a configuration diagram schematically showing a rechargeable battery according to an embodiment of the present invention from the front.

As illustrated in FIG. 1, a secondary battery according to an exemplary embodiment of the present invention includes an electrode current collector 1, a case accommodating the electrode current collector 1 therein, and an opening 11 formed at one side thereof. And a hopper member 20 for detachably coupling to the opening 11 and injecting an electrolyte into the case 10.

The electrode current collector 20 can be produced by, for example, laminating a plurality of times a separator interposed between a cathode coated with a cathode active material and a cathode coated with an anode active material, and a separator interposed between the cathode and the anode.

However, the present invention is not limited thereto, and the electrode current collector 1 may be manufactured by winding a laminate in which a cathode, a separator, and a cathode are laminated in a jelly roll form.

The positive electrode may be an aluminum plate, and may include a positive electrode active material portion coated with a positive electrode active material and a positive electrode non-coated portion not coated with the positive electrode active material.

The positive electrode active material may be a lithium-containing transition metal oxide such as LiCoO 2, LiNiO 2, LiMnO 2, LiMnO 4, or a lithium chalcogenide compound.

For example, the positive electrode active material may be formed by applying a positive electrode active material to a portion of at least one surface of the aluminum plate, and the remaining portion of the aluminum plate not coated with the positive electrode active material may be a positive electrode non-coating portion.

The negative electrode may be a copper plate, and may include a negative electrode active material portion coated with a negative electrode active material and a negative electrode non-coated portion not coated with the negative electrode active material.

The negative electrode active material may be crystalline carbon, amorphous carbon, carbon composite, carbon material such as carbon fiber, lithium metal, lithium alloy, or the like.

For example, the negative electrode active material may be formed by applying a negative electrode active material to a portion of at least one side of the copper plate, and the remaining portion of the copper plate not coated with the negative electrode active material may be a negative electrode non-coating portion.

The separator is, for example, any one selected from the group consisting of polyethylene (PE), polystyrene (PS), polypropylene (PP) and copolymers of polyethylene (PE) and polypropylene (PP). It can be prepared by coating a polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP co-polymer).

The electrolyte facilitates the movement of lithium ions in the electrode assembly, and may include, for example, a nonaqueous organic solvent and a lithium salt.

The lithium salt may be dissolved in an organic solvent to serve as a source of lithium ions in the secondary battery and to promote the movement of lithium ions between the positive electrode and the negative electrode.

Examples of lithium salts include LiPF6, LiBF4, LiSbF6, LiAsF6, LiCF3SO3, LiN (CF3SO2) 3, Li (CF3SO2) 2N, LiC4F9SO3, LiClO4, LiAlO4, LiAlCl4, LiN (CxF2x + 1SO2) (CyF2y + 1SO2) And y is a natural water), LiCl, LiI, and lithium bisoxalate borate (lithium bisoxalate borate), such as one or more, including a supporting electrolyte salt (supporting).

The concentration of the lithium salt in the electrolyte may vary depending on the application, and is usually used within the range of 0.1M to 2.0M.

In addition, the organic solvent serves as a medium through which ions involved in the electrochemical reaction of the battery can move, for example, benzene, toluene, fluorobenzene, 1,2-difluorobenzene, 1,3- Difluorobenzene, 1,4-difluorobenzene, 1,2,3-trifluorobenzene, 1,2,4-trifluorobenzene, chlorobenzene, 1,2-dichlorobenzene, 1,3- Dichlorobenzene, 1,4-dichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene, iodobenzene, 1,2-diiobenzene, 1,3- Diiodobenzene, 1,4-diiodobenzene, 1,2,3-triiodobenzene, 1,2,4-triiodobenzene, fluorotoluene, 1,2-difluorotoluene, 1 , 3-difluorotoluene, 1,4-difluorotoluene, 1,2,3-trifluorotoluene, 1,2,4-trifluorotoluene, chlorotoluene, 1,2-dichlorotoluene, 1 , 3-dichlorotoluene, 1,4-dichlorotoluene, 1,2,3-trichlorotoluene, 1,2,4-trichlorotol N, iodotoluene, 1,2-dioodotoluene, 1,3-dioodotoluene, 1,4-dioodotoluene, 1,2,3-triiodotoluene, 1,2,4- Triiodotoluene, R-CN (wherein R is a linear, branched or cyclic hydrocarbon group having 2 to 50 carbon atoms, and the hydrocarbon group may include a double bond, an aromatic ring or an ether bond, etc. Dimethylformamide, dimethylacetate, xylene, cyclohexane, tetrahydrofuran, 2-methyltetrahydrofuran, cyclohexanone, ethanol, isopropyl alcohol, dimethyl carbonate, ethylmethyl carbonate, diethyl carbonate, methylpropyl carbonate , Propylene carbonate, methyl propionate, ethyl propionate, methyl acetate, ethyl acetate, propyl acetate, dimethoxyethane, 1,3-dioxolane, diglyme, tetraglyme, ethylene carbonate, Ropil butylene carbonate, gamma-butyrolactone include, sulfolane (sulfolane), valerolactone, big surprise grade or type of mevalolactone or different than, but is not limited to this.

2 is a configuration diagram showing only the case in FIG.

The case 10 forms an exterior of a secondary battery and generally uses a can or a pouch.

In addition, the case 10 is a metal container having an open top shape, and is generally made of aluminum or an aluminum alloy that is light and easy to cope with corrosion.

In addition, the case 10 becomes a container of the electrode current collector 1 and an electrolyte solution (not shown), and the electrode current collector 1 is inserted into the case 10 through an open upper end of the case 10.

The present invention seals the open upper end of the case 10 after inserting the electrode current collector 1 into the case 10, and an opening at the top of the case 10 to inject electrolyte into the case 10. 11 is formed so that it may open without sealing.

That is, the opening 11 is formed at the upper end of the case 10 with a minimum size for injecting the electrolyte solution, and the hopper member 20 is coupled to the opening 11 to form the case 10 through the hopper member 20. Inject the electrolyte inside.

3 is a configuration diagram illustrating only the hopper member in FIG. 1, and FIG. 4 is a plan view of the hopper member of FIG. 3.

As shown in FIGS. 3 to 4, the hopper member 20 is coupled to the opening 11 of the case 10 so as to easily inject the electrolyte into the case 10.

That is, the hopper member 20 has an inlet 21 through which the electrolyte is injected, and an outlet 22 is formed at the other end to transfer the electrolyte to the case 10.

And the hopper member 20 has a diameter of the outlet 22 is smaller than the inlet 21, for example, to form a shape such as a funnel, such that the diameter gradually decreases from the inlet 21 to the outlet 22. Can be.

Thus, the hopper member 20 forms a shape such as a funnel to facilitate the injection of the electrolyte.

 In addition, the hopper member 20 is hermetically coupled to the opening 11 of the case 10 by the outlet 22 side when the electrolyte is injected into the case 10 through the hopper member 20. It prevents the electrolyte solution injected into the interior from being scattered and volatilized.

According to the exemplary embodiment of the present invention, the outlet 22 of the hopper member 20 may be tightly coupled to be inserted into the opening 11 of the case 10.

In this case, the outlet 22 of the hopper member 20 may be formed of a resin material such as rubber or silicone, and may be sealingly sealed in a state of being inserted into the opening 11 of the case 10.

Other embodiments in which the hopper member 20 is coupled to the opening 11 of the case 10 will be described in detail with reference to FIGS. 5 to 8.

Description of each embodiment will be described focusing on the difference and not overlapping.

Figure 5 is a block diagram showing a hopper member according to another embodiment of the present invention.

As shown in FIG. 5, in the hopper member 20 according to another embodiment of the present invention, a thread 23 is formed around an outlet 22 side, and the thread is formed inside the opening 11 of the case 10. A screw thread (not shown) corresponding to (23) is formed so that the hopper member 20 and the opening 11 of the case 10 can be detachably screwed together.

In this case, the portion where the hopper member 20 and the opening 11 of the case 10 are screwed together may be formed of a resin material such as rubber or silicone, and may be tightly sealed.

Figure 6 is a block diagram showing a hopper member according to another embodiment of the present invention.

As shown in FIG. 6, in another embodiment of the present invention, the hopper member 20 may have the diameter of the opening 22 of the case 22 having the diameter of the outlet 22.

In addition, the connection member 30 may be used to tightly attach and detach the outlet 22 of the hopper member 20 and the opening 11 of the case 10.

7 is an exploded view of a secondary battery according to another embodiment of the present invention, Figure 8 is a block diagram showing a secondary battery according to another embodiment of the present invention.

As shown in Figures 7 to 8, the connecting member 30 is made of a resin tube such as rubber or silicone, etc. to fit the outlet 22 of the hopper member 20 to one end of the connecting member 30 by fitting And the other end of the connection member 30 by forcibly fitting the opening 11 of the case 10 can be detachably coupled to the hopper member 20 and the opening 11 of the case 10 while being watertight.

As such, the hopper member 20 of the present invention is tightly coupled to the opening 11 of the case 10, and the electrolyte is injected into the case 10 through the hopper member 20 while being injected into the case 10. The prepared electrolyte solution can be prevented from being volatilized through scattering.

In addition, since the hopper member 20 is detachably coupled to the opening 11 of the case 10, the hopper member 20 is removed after the completion of the injection of the electrolyte into the case 10, and the opening is opened to a minimum size. The working time of sealing the opening 11 of the case 10 can be shortened, thereby minimizing the volatilization of the electrolyte through the opening 11, thereby maximizing the amount of electrolyte remaining in the case 10.

The secondary battery according to the present invention configured as described above has the effect of stably maintaining the required amount of electrolyte solution by preventing the scattering of the electrolyte solution injected into the secondary battery.

In addition, there is an effect of preventing the performance of the secondary battery by preventing the scattering of the electrolyte solution injected into the secondary battery.

In addition, it is possible to prevent the scattering of the electrolyte solution injected into the secondary battery, thereby maintaining the performance of the secondary battery in a stable manner.

In addition, it is possible to prevent the scattering of the electrolyte solution injected into the secondary battery, thereby ensuring product reliability of the secondary battery.

Although the secondary battery according to the present invention has been described with reference to the illustrated drawings as described above, the present invention is not limited by the embodiments and drawings described above, it is usually within the scope of the claims to the present invention Many modifications and variations are possible to those skilled in the art.

1: electrode current collector
10: case
11: opening
20: hopper member
21: entrance
22: exit
30: connecting member

Claims (5)

An electrode current collector 20;
A case 10 accommodating the electrode current collector 20 therein and having an opening 11 formed at one side thereof; And
A hopper member 20 detachably coupled to the opening 11 and for injecting an electrolyte into the case 10; Including,
One end of the hopper member 20 is formed with an inlet 21 into which the electrolyte is injected, and the other end is coupled with the case 10 to deliver the electrolyte to the case 10, but has a diameter greater than that of the inlet 21. A small outlet 22 is formed,
The hopper member 20 has a thread 23 formed around the outlet 22 side, and a thread corresponding to the thread 23 is formed inside the opening 11 of the case 10 so that the hopper member ( 20 and the opening 11 of the case 10 is screwed detachably,
The opening 11 is provided to be spaced apart from the case 10, and is connected to the case 10 through a neck portion 11a,
Secondary battery, characterized in that the case (10), the neck (11a) and the opening (11) are integrally connected. The method according to claim 1,
The hopper member 20 is a secondary battery, characterized in that to be airtightly coupled to the opening (11). delete The method according to claim 1,
Secondary battery, characterized in that the diameter of the outlet 22 and the opening 11 of the hopper member 20 coincide. delete

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