KR20160053535A - battery of wound type for enhancing durability and stability - Google Patents

Abstract

The present invention relates to a wound type battery, in which a support fixer supports a center and upper parts of an electrode assembly to prevent the electrode assembly from deforming and deviating when an external impact and vibration occurs, thereby remarkably increasing durability and stability, the outer surface of the support fixer is coated with Teflon to remove a resistance value of the support fixer, thereby solving a conventional problem that electrode efficiency reduces due to an intrinsic resistance value of the support fixer, and a fore-end part of the support fixer has an insertion part to simply install with the battery assembly and effectively prevent a breakage of the electrode assembly during assembly. In addition, the wound type battery is capable of effectively preventing a phenomenon that an electrolyte is congregated and stagnated in a center and lower areas inside a battery case.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rechargeable battery having enhanced durability,

The present invention relates to a rewound type battery having enhanced durability, and more particularly, to a rewound type rewritable battery which can prevent a deformation of an internal structure of a battery due to an external impact or vibration and can dramatically increase durability and safety, Type battery.

Typically, in a wound-type battery, an electrode assembly wound in a roll type in which a cathode and an anode are stacked on a separator is provided inside the case. At this time, a glass fiber nonwoven fabric having excellent insulating property is mainly used as a separation film, and each glass fiber is fixed through an adhesive body to maintain its shape.

This conventional coiling-type battery is characterized in that 1) when the roll-shaped electrode assembly is impregnated with the electrolytic solution, the adhesive reacts with the electrolytic solution to separate the separation membrane, thereby damaging or deteriorating the performance of the electrode assembly due to external impact or vibration, When an impact equal to or greater than the threshold value occurs, the central portion of the electrode assembly protrudes upward and short-circuiting occurs.

That is, since the coiling-type battery provided inside the case with the electrode assembly wound thereon has a very weak structure against external shock and vibration, the durability of the battery is directly related to the performance of the battery. Various studies have been conducted to reduce deformation and damage of the electrode assembly.

FIG. 1 is a perspective view showing a leaf spring disclosed in Korean Patent No. 10-0774445 (entitled "Wound-type Battery"), and FIG. 2 is a perspective view showing a state in which the leaf spring of FIG. 1 is wound.

1 and 2, a conventional wind-up type battery (hereinafter referred to as a conventional technique) includes a wind-up foam 950 installed in a case (not shown) and a wind- And includes an elastic member 900 to be installed.

Further, the wind-up foam 950 is rolled up in the form of a roll when the anode 930 and the cathode 940 are laminated on the upper surfaces of the separating films 910 and 920, respectively, and installed inside the case. At this time, the elastic member 900 is inserted into the hollow of the wind-up foam 950.

The elastic member 900 is also bonded to the winding form 950 through an insertion process in which the elastic member 900 is made in the initial plate form and is hollowed out of the winding form 950 after being cylindrically dried by the operator.

However, in the prior art, the diameter of the elastic member 900 is formed to be the same diameter as the hollow inner diameter of the wind-up foam 950, so that the lower end portion of the elastic member 900 is forcedly inserted into the upper hollow portion of the wind- The separation membranes 910 and 920 of the wind-up foam 950 are formed of low-strength non-woven fabric and are not easy to be constricted. Thus, the separation membrane 910 is formed by the end of the elastic member 900, And 920 are often damaged or broken.

Further, in the prior art, when external vibration and impact exceeding the limit value are applied, the inner part, which is the central portion of the wind-up foam 950, is displaced upward due to a strong impact and the electrode is disturbed to cause internal short.

In order to solve such a problem, a support disclosed in Korean Patent No. 10-0822014 filed by the applicant of the present invention and registered with the patent (name of the invention: battery with a support) is installed on the upper side of the winding form 950 There is a method of preventing the winding form 950 from being deformed or detached by an external impact. However, the provision of the separate supporting member in this way has a limitation in not only increasing the space occupation of the battery case but also complicating the manufacturing and assembling process.

In this case, the conventional one includes an insulating plate installed inside the case so that one surface thereof is in contact with the upper end of the electrode assembly. However, the insulating plate has a structure limit for forming an electrode assembly, .

Also, in the prior art, the elastic member 900 presses the wind-up foam 950 outwardly by the restoring force, so that the electrode parts forming the wind-up foam 950 remain in close contact with each other, Since the anode 930 and the cathode 940 are excessively adhered to each other due to the expansion of the anode when the electrolyte flows, the conventional art has a problem that the efficiency of the electrolytic solution is lowered.

In addition, since the elastic member 900 is formed of a metal material such as stainless steel or the like, the prior art 100 has a resistance value of itself and is therefore vulnerable to insulation and has a disadvantage that electrode performance is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an electrode assembly in which a support hole is provided in a hollow hole of an electrode assembly, The present invention is to provide a wound-type battery in which deformation and disconnection of an electrode assembly can be prevented, and durability and stability can be dramatically increased.

Another problem of the present invention is to solve the problem that the outer surface of the support body is coated with teflon and the resistance value of the stuck body is removed so that the electrode efficiency deteriorates due to the self resistance value of the support body, And to provide a wound-type battery which can increase electrode efficiency.

According to another aspect of the present invention, there is provided an electrode assembly including an insertion portion formed at a distal end portion of a support body inserted into a hollow hole of the electrode assembly, the insertion portion having an inclined surface having a smaller diameter toward an end portion thereof, Which is capable of preventing the battery from being damaged.

Further, another solution of the present invention is to provide a method of manufacturing an electrode assembly in which a plurality of electrolyte inlet / outlet holes and through holes are formed in each of a support portion and an insertion portion of an electrode assembly, The present invention is intended to provide a wound-type battery that can effectively prevent the phenomenon of sticking.

Further, another object of the present invention is to provide an electrode assembly in which a protruding portion is vertically extended from an upper end of a supporting portion and is formed in a circular strip shape in which both ends are connected along an arc, Accordingly, it is an object of the present invention to provide a wound-type battery that can more firmly support the electrode assembly to further enhance its durability and safety.

According to a first aspect of the present invention, there is provided a winding type battery in which an electrode assembly in which electrodes are stacked on a separator and wound in a roll shape to form a hollow hole at the center is housed in a battery case, The battery includes a support body formed in a hollow cylindrical shape having upper and lower openings to be installed in a hollow hole of the electrode assembly, and the support body is coated with an insulating material on its outer surface.

Further, in the present invention, the support base member may include a cylindrical support member having upper and lower openings; Further comprising at least one projecting part vertically bent from one side of the upper end of the supporting part to the outside when an end portion of the electrode assembly inserted into the hollow hole is referred to as a lower portion and an opposite end portion thereof is referred to as an upper portion, When the electrode assembly is installed in the electrode assembly, the bottom surface of the electrode assembly is supported by the upper end of the electrode assembly to support the upper end of the electrode assembly.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, Further comprising a protruding portion connected to the electrode assembly along an arc, the protruding portion being vertically bent from an upper end of the supporter to an outer side when an end portion of the electrode assembly inserted into the hollow hole is referred to as a lower portion and an opposite end portion thereof is referred to as an upper portion, When the electrode assembly is installed in the electrode assembly, the bottom surface of the electrode assembly is supported by the upper end of the electrode assembly to support the upper end of the electrode assembly.

In addition, in the present invention, the support body may further include an insertion portion formed in a cylindrical shape having upper and lower openings and connected to a lower end portion of the support portion, the insertion portion being formed as an inclined surface so that the outer diameter decreases toward the end portion at a point connected to the lower end portion desirable.

Also, in the present invention, it is preferable that a plurality of electrolyte inlet / outlet holes are formed in the support portion of the support body.

In the present invention, it is preferable that a plurality of through holes are formed in both sides of the insertion portion of the support body, and the through holes are connected to the lower end of the insertion portion.

In the present invention, the insulating material is preferably Teflon.

According to the present invention having the above-mentioned problems and solutions, the center and the upper end portions of the electrode assembly are supported by the stiffness of the support so that the deformation and the deviation of the electrode assembly are prevented when the external impact and the vibration are generated, thereby remarkably improving the durability and stability.

According to the present invention, since the outer surface of the support body is treated with Teflon and the resistance value of the stuck body is removed, it is possible to solve the problem that the electrode efficiency deteriorates due to the self resistance of the support body.

In addition, according to the present invention, since the insertion portion is formed at the distal end portion of the support body, it is possible to simplify the installation with the electrode assembly and effectively prevent damage to the electrode assembly during assembly.

In addition, according to the present invention, it is possible to effectively prevent the electrolyte from concentrating in the central and lower regions of the battery case.

1 is a perspective view showing a leaf spring disclosed in Korean Patent No. 10-0774445 (entitled "Wound-type Battery").
Fig. 2 is a perspective view showing a state in which the leaf spring of Fig. 1 is wound.
3 is a side sectional view showing a battery which is one embodiment of the present invention.
Fig. 4 is a plan view showing the electrode assembly and the holding body of Fig. 3;
Fig. 5 is a perspective view showing a state in which the holding body of Fig. 3 is deployed. Fig.
Fig. 6 is a plan view of Fig. 5. Fig.
Fig. 7 is a perspective view showing a state in which the support body of Fig. 5 is wound. Fig.
Fig. 8 is a side view of Fig. 7. Fig.
Fig. 9 is a perspective view showing a second embodiment of the staple hold of Fig. 7;

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 3 is a side sectional view showing a battery which is one embodiment of the present invention, and FIG. 4 is a plan view showing the electrode assembly and the holding body of FIG. 3.

The battery 1 of FIG. 3 is a lithium-thionyl (Li / Socl2) battery requiring physical stability against an external impact. The battery 1 includes a battery case 2 having an open top and a space therein, (5) provided at the center of the electrode assembly (3) and supporting the electrode assembly (3); a battery case (5) provided at the upper opening of the battery case (2) 2) for sealing the inside thereof.

The outer surface of the header 7 is welded to the inner circumferential surface of the battery case 2 to seal the inside of the battery case 2.

The header 7 is composed of a disk 71 formed in a hollow disk shape to form a negative terminal and a bipolar pin 73 insulated and welded to the hollow of the disk 71 through a sealant 75. At this time, the disc portion 71 which is the negative electrode terminal is connected to the negative electrode 37 via the negative lead wire 79 and the positive electrode pin 73 is connected to the positive electrode 35 through the positive lead wire 77, The header 7 is connected to the electrode assembly by the positive lead wire and the negative lead wire. However, the structure of the header is not limited thereto, and various known configurations and techniques may be applied.

As shown in FIGS. 3 and 4, the electrode assembly 3 is formed by winding both sides 35 and 37 on the separators 31 and 33, respectively, And a hollow hole 39 through which the support body 5 can be inserted is formed at the center.

The cathode 35 is disposed on the separator 31 and is made of a cathode active material capable of intercalating and deintercalating lithium ions and specifically includes at least one selected from the group consisting of cobalt, And is formed of amorphous carbon containing a polytetrafluoroethylene binder (PTTE binder).

The anode 37 is made of lithium foil (FOIL) having a thickness of 0.3 to 1.5 mm and is disposed in the separation membrane 33.

The negative electrode 37 is made of a negative active material capable of storing and releasing ions, and in detail, it is formed of lithium or a lithium alloy component.

Separators 31 and 33 are disposed on the anode 35 or the cathode 37 to separate the anode 35 and the cathode 37 from each other.

The separators 31 and 33 are formed of a glass fiber nonwoven fabric having excellent insulating properties.

The supporting body 5 is a device which is inserted into the hollow hole of the electrode assembly 3 and supports the central portion and the upper end of the supporting body 5 so that the electrode assembly 3 can be separated, prevent.

Fig. 5 is a perspective view showing a state in which the holding body of Fig. 3 is deployed, and Fig. 6 is a plan view of Fig. 5. Fig.

The support body 5 may be made of various shapes and materials as shown in FIGS. 5 and 6, but it is preferable that the support body 5 is made of a plate-shaped metal plate spring which is easy to manufacture and has excellent durability.

The supporting body 5 includes a supporting portion 51 in the form of a rectangular plate having an area, protruding portions 53 projecting outwardly at one end of the supporting portion 51, And an insertion portion 55 formed to be narrowed so that the length of the connected width becomes longer toward the outside.

The supporting portion 51 is formed of a rectangular plate member having an area, and a plurality of electrolyte inlet / outlet holes 511 penetrating both sides are formed on both sides.

The support portion 51 has a projecting portion 53 at one end thereof, an insertion portion 55 connected to the other end thereof, a coupling portion 57 extending from both sides of the opposite side portion connecting the one end portion and the other end portion, , And (57 ') angles are formed.

In addition, when the support portion 51 is wound by an external force so that the engaging portions 57 and 57 'formed on both side portions are brought into contact with each other, the support portion 51 forms a cylindrical shape having upper and lower portions opened. That is, when the support portion 51 is inserted into the hollow hole 39 of the electrode assembly 3, the outer peripheral surface of the support portion 51 is supported by the inner peripheral surface of the electrode assembly 3 to support the electrode assembly 3.

The protruding portions 53 protrude outward from one end of the support portion 51 and are spaced apart from each other.

The projecting and contracting portions 53 are vertically bent so as to face the outside of the circle when the supporting portion 51 is wound in a cylindrical shape so that when the supporting portion 51 is inserted into the hollow hole 39 of the electrode assembly 3 It is possible to prevent the region adjacent to the hollow hole 39 of the electrode assembly 3 from being deviated to the upper portion due to the vibration or impact exceeding the limit value because the one surface is accommodated in the upper end portion of the electrode assembly 3 adjacent to the hollow hole 39 .

Although the projecting length L of the projecting and retreating part 53 is shown to be small for the convenience of explanation in the present invention, the projecting length of the projecting and retreating part 53 is not limited to the length of the outer and inner diameters of the electrode assembly 3 So as to support the entire upper end of the electrode assembly during assembly.

In the present invention, for convenience of explanation, the number of the weaving unit 53 is three, but the number of the weaving unit 53 is not limited thereto.

The insertion portion 55 is connected to the other end portion of the support portion 51 and is formed to be inclined so that both side portions thereof become narrower from the support portion 51 toward the end portion.

The insertion portion 55 is formed at the end portion inwardly from the end portion, and a plurality of through holes 551 penetrating the both surfaces are formed. At this time, in the present invention, the penetration holes 551 are formed in the inserting portion 55 of the support body 5, so that the electrolytic solution concentrated in the lower center of the case 2 is provided with a path for passing through the through holes 551 do.

As described above, when the support portion 51 is wound, the support base body 5 constructed as described above is engaged with the engagement portions 57 and 57 'so that the support portion 51 forms a cylindrical shape. In this state, The discharge portions 53 are bent perpendicularly in the direction toward the outside of the circle.

Fig. 7 is a perspective view showing a state in which the support body of Fig. 5 is wound, and Fig. 8 is a side view of Fig. 7. Fig.

As shown in Figs. 7 and 8, the holding and holding member 5 includes a support portion 51 formed in a cylindrical shape having upper and lower openings, an insertion portion 55 connected to one opening of the support portion 51, (Not shown).

The supporting portion 51 is formed in a cylindrical shape with upper and lower portions opened, and a plurality of electrolyte inlet / outlet holes 511 penetrating both surfaces of both sides are formed.

The supporting portion 51 is supported on the inner circumferential surface of the electrode assembly 3 when the assembly is assembled, thereby supporting the electrode assembly 3. In the present invention, since the electrolytic solution is concentrically formed in the center and the downside of the inside of the battery case in a planar manner, the electrolytic solution does not accumulate due to the supporting body 5 provided in the hollow hole 39 of the electrode assembly 3, A plurality of electrolytic solution outflow holes 511 are formed in the supporting part 51 so that electrolyte solutions accumulated in the center can be flowed by the electrolyte solution outflow holes 511. [

The insertion portion 55 is connected to the lower portion of the support portion 51 and is inclined so that the inner diameter becomes narrower toward the end portion and a hollow is formed at the center at the central opening of the support portion 51.

The support portion 51 of the support body 5 is formed to have the same size as the inner diameter of the hollow hole 39 of the electrode assembly 3 and is constrained to the hollow hole 39 of the electrode assembly, The insertion portion 55 is formed at the end of the support portion 51 in order to prevent the upper end forming the hollow hole 39 of the support portion 51 from being damaged or damaged by the friction with the support body 5, Is formed to have an outer diameter smaller than that of the hollow hole (39) during assembly and is easily inserted into the hollow hole (39), thereby facilitating the installation and effectively preventing damage and breakage of the electrode assembly .

In addition, the insertion portion 55 has a plurality of through holes 551 formed inwardly from the end portion thereof, so that the electrolytic liquids concentrated at the lower central portion of the battery case are flowed to the other side without passing through the through holes 551 of the insertion portion 55 Thus, the dry cell phenomenon due to the electrolyte isolation can be effectively prevented.

The projecting portions 53 are vertically bent from the supporting portion 51 so as to be connected to the upper end of the supporting portion 51 and to face the outside of the circle in plan view.

The protruding portions 53 are provided on the upper surface of the electrode assembly 3 at one side facing the insertion portion 55 at the time of installation so that the upper end of the electrode assembly 3 is supported by the electrode assembly 3 3 are separated upward, thereby effectively preventing short-circuiting of the battery.

Since the support base 5 constructed as described above is formed of a metal material such as stainless steel, it has a resistance value on its own and is vulnerable to insulation.

Accordingly, in the present invention, the outer surface of the support body 5 is coated with Teflon to increase the insulation efficiency.

Fig. 9 is a perspective view showing a second embodiment of the staple hold of Fig. 7;

9 includes the support portion 51 and the insertion portion 55 of the support base 5 of Fig. 7 described above and is vertically bent outward at the upper end of the support portion 51 to form a circular band shape And the protruding portion 253 is formed so as to extend along the arc and to connect both ends thereof.

In addition, since the protruding portion 253 is formed in the shape of a ring-shaped band, the area of the bottom surface that is brought into contact with the upper end portion of the assembled fixture 3 at the time of installation increases, so that the assembled fixture 3 can be more firmly supported.

1: Coil-type battery 3: Electrode assembly 5:
7: header 31, 33: separator 35: anode
37: cathode 51: support part 53:
55: inserting portion 57: engaging portion 511: electrolyte inlet / outlet hole
551: Through ball

Claims (7)

A wound-type battery in which an electrode assembly in which electrodes are stacked on a separator and wound in a roll shape to form a hollow hole in the center is housed in a battery case, comprising:
The winding type battery
And a support hole formed in an upper and lower cylindrical shape to be installed in the hollow hole of the electrode assembly,
And the outer surface of the support body is coated with an insulating material. [Claim 2] The method according to claim 1,
A cylindrical support portion having upper and lower openings;
Further comprising at least one projecting part vertically bent from one side of the upper end of the supporting part to the outside when an end portion of the electrode assembly inserted into the hollow hole is referred to as a lower portion and an opposite end portion thereof is referred to as an upper portion,
Wherein the projecting and retracting portion supports the upper end of the electrode assembly when the lower surface of the protrusion is provided on the upper end of the electrode assembly. [Claim 2] The method according to claim 1,
A cylindrical support portion having upper and lower openings;
Further comprising a protruding portion vertically bent and connected along an arc from an upper end of the supporting portion to an upper end of the electrode assembly, the end of the electrode assembly being inserted into the hollow hole,
Wherein the projecting and retracting portion supports the upper end of the electrode assembly when the lower surface of the protrusion is provided on the upper end of the electrode assembly. 4. The apparatus according to claim 2 or 3,
Further comprising an insertion portion formed in a cylindrical shape having an upper and lower openings and connected to a lower end portion of the support portion and formed to have an inclined surface so that an outer diameter becomes smaller toward an end at a point connected to the lower end portion. 5. The wound-type battery according to claim 4, wherein a plurality of electrolyte inlet / outlet holes are formed in the support portion of the support body. 6. The wound-type battery according to claim 5, wherein a plurality of through holes are formed in both sides of the insertion portion of the support body, and the through hole is connected to a lower end of the insertion portion. 7. The wound-type battery according to claim 6, wherein the insulating material is teflon.

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