KR20070006247A - Rolling device for secondary battery - Google Patents

Abstract

Provided is a winding device for a secondary battery, which fixes one end of a first electrode plate, a second electrode plate and a separator to be wound on a mandrel, and thus improves production yield of an electrode assembly. The winding device for a secondary battery comprises: a mandrel unit, into which one end of a stacked structure of a first electrode plate(1), a second electrode plate(3) and a separator(5); and a mandrel gap controlling unit for controlling the gap of the mandrel unit to fix or unfix the end of the stacked structure of the first electrode plate, the second electrode plate and the separator. The mandrel unit comprises a first mandrel member(131) and a second mandrel member spaced apart from each other for inserting the stacked structure, and a first mandrel housing and a second mandrel housing for fixing one end of each mandrel member.

Description

Winding device for secondary battery {Rolling Device for Secondary battery}

1 is a view schematically showing a conventional winding device for a secondary battery,

2 is a view schematically showing a winding device for a secondary battery according to the present invention;

3 is a view showing a part of a winding device for a secondary battery according to the present invention;

4 is a view showing another part of a winding device for a secondary battery according to the present invention;

5 is a cross-sectional view showing a part of a cross section of a winding device for a secondary battery according to the present invention.

<Brief Description of Major Codes in Drawings>

1: first electrode plate 3: second electrode plate

5: Separator 9: Electrode Assembly

20: cutter portion 30: fixed tape

110: rotating plate 111: rotating hole

115: rotation axis 131: first mandrel member

133: second mandrel member 135: auxiliary mandrel member

151: first mandrel housing 153: second mandrel housing

161: first bracket 163: first projection

171: second bracket 173: second projection

181: flow member 183: fixed member

210: pressure driving unit 211: first pressure member

213: second pressure member 215: pressure elastic member

220: coupling member 221: outer wall

223: bulkhead

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode plate winding device, and more particularly, to an electrode plate winding device for a secondary battery for winding an electrode plate constituting an electrode assembly accommodated in a secondary battery.

Recently, compact and lightweight electric / electronic devices such as cellular phones, notebook computers, camcorders, etc. have been actively developed and produced. These portable electric / electronic devices have a battery pack that can be operated in a place where no separate power source is provided. The built-in battery pack includes at least one battery therein for outputting a predetermined level of voltage for driving the portable electric / electronic device for a period of time.

In consideration of economical aspects, battery packs employ secondary batteries that can be charged and discharged in recent years. Typical secondary batteries include nickel secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.

In particular, the lithium secondary battery has an operating voltage of 3.6 V, which is three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for portable electronic equipment, and is rapidly increasing in terms of high energy density per unit weight. to be.

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. In general, a battery is classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte, and a battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery. Moreover, although a lithium secondary battery is manufactured in various shapes, typical shapes include cylindrical shape, square shape, and pouch type.

Typically, a lithium secondary battery is positioned between the first and second electrode plates and between the first and second electrode plates, and a separator wound electrode that prevents a short and only allows movement of lithium ions (Li-ion). An assembly, a lithium secondary battery case accommodating an electrode assembly, and an electrolyte solution injected into the lithium secondary battery case to enable movement of lithium ions.

The first and second electrode plates having a positive electrode or a negative electrode are coated with an active material on a substrate, dried and rolled, and then cut to fit a predetermined size, and the cut first and second electrode plates are wound together with a separator to form an electrode. To form an assembly. In this case, the first and second electrode tabs having the polarity are attached to the first and second electrode tabs which are drawn out of the electrode assembly to transmit the polarity of the first and second electrode plates.

Here, the winding device inserts the ends of the first and second electrode plates and the separators respectively supplied from the wound portions of the first and second electrode plates and the separators into the insertion grooves formed in the center of the mandrel, and then rotates the mandrel. These are wound around the outer surface to complete the electrode assembly. The electrode assembly completed by the winding device is accommodated in the case and finished with the cap assembly to complete the secondary battery.

That is, as shown in FIG. 1, the end of the first and second electrode plates 1 and 3 and the separator 5 is inserted into the insertion groove 15 of the mandrel 11, and then the mandrel 11. When the coil is wound to some extent by rotating the other ends of the first and second electrode plates 1 and 3 and the separator 5, the fixing tape 30 is taped.

However, in the conventional winding apparatus, the first and second electrode plates 1 and 3 and the separator 5 are not fixed to the mandrel 11, so that the first and second electrode plates are taped to tape the fixing tape 30. When cutting the (1, 3) and the separator (5), the first and second electrode plates (1, 3) and the separator (5) already wound are partially loosened. Therefore, the first and second electrode plates 1 and 3 and the separator 5 are cumbersome to be wound up after unwinding part after being cut in the wound state.

In addition, the other side first and second electrode plates 1 and 3 and the separator 5 wound and cut are newly wound on the next mandrel 13. In this case, the mandrel 13 may be wound so that the cut side may be normally wound. It should be rotated in the opposite direction to the winding direction by the interval of. That is, since the first and second electrode plates 1 and 3 and the separator 5 inserted into the insertion grooves 15 of the mandrel 13 are not fixed, the first and second electrode plates 1 and 3 and the separator 5 are not fixed. There is a hassle to prevent the first and second electrode plates 1 and 3 and the separator 5 from leaving the insertion groove 15.

The present invention has been made to solve the problems described above, an object of the present invention is to fix the end of the first and second electrode plate and the separator wound on the mandrel, the secondary battery winding to increase the production process yield of the electrode assembly To provide a device.

The present invention for achieving the above object is fixed to the end of the first and second electrode plate and the separator by adjusting the gap between the mandrel unit and the mandrel unit is inserted into one end of the first and second electrode plate and the separator is stacked. It provides a secondary battery winding device comprising a mandrel gap control unit for releasing or fixed.

The mandrel unit may include a first mandrel member and a first mandrel housing for fixing one end of the first and second mandrel members and the first and second mandrel members spaced apart to insert the first and second electrode plates and the separator therebetween. It may include.

At least three mandrel units may be provided and rotated by the rotating plate driving unit, and installed on the rotating plates on which the rotating holes are formed.

The rotating hole may be spaced apart from the first and second mandrel members in a straight line to be coupled to the first and second mandrel members, and a rotating shaft may be inserted.

Preferably, the rotary shaft is interposed with a pressurized elastic member.

The mandrel gap control unit is a coupling part for coupling the other end of the first and second mandrel members to the rotational shaft, and when the coupling part and the first and second mandrel members are coupled, a gap between the first and second mandrel members is formed. It may include a gap adjusting portion for adjusting.

The coupling part may include a pressure driving part for selecting and pressing any one of the rotation shafts inserted into the rotation hole, and a coupling member installed on the rotation shaft and coupled to the first and second mandrel members.

The coupling member may have a circular partition having one side cylindrical and having a circumference smaller than an outer diameter therein.

The other end of the first and second mandrel members coupled to the coupling member may include the first and second electrode plates and the separator between the first and second mandrel members so as to be inserted between the outer wall and the partition wall of the coupling member. When inserted, they are preferably formed in semicircles so as to form a circle.

When the first mandrel member and the second mandrel member have a circular shape, the circumference thereof is preferably smaller than the outer wall circumference of the coupling member and larger than the partition circumference.

The gap adjusting part may be installed on an auxiliary mandrel member coupled to the inside of the second mandrel member, a first bracket fixed to one end of the second mandrel member and inserted into one side of the mandrel housing, and a right side of the first bracket. And a first protrusion extending or protruding inwardly, and fixing one end of the auxiliary mandrel member to a lower side of the first bracket and inserted into the other side of the mandrel housing to the left side of the second bracket and the second bracket. It is preferable to include a second protrusion installed and drawn or protruded inward.

The inner surface of the first mandrel member is provided with a flow member which is in contact with the first and second electrode plates and the separator and is movable horizontally, and the fixing member is disposed on the inner surface of the auxiliary mandrel member opposite the flow member. Can be installed.

The flow member may be formed of a material having elasticity, and the material having elasticity may be urethane.

The fixing member is preferably formed of the same material as the flow member.

The first and second protrusions may be provided with elastic members inside the first and second brackets, respectively.

Hereinafter, with reference to the drawings will be described in detail the winding device for a secondary battery of the present invention.

1 is a view schematically showing a conventional secondary battery winding apparatus, Figure 2 is a view schematically showing a secondary battery winding apparatus according to the present invention.

Figure 3 is a view showing a part of the secondary battery winding apparatus according to the present invention, Figure 4 is a view showing another part of the secondary battery winding apparatus according to the present invention, Figure 5 is a secondary battery winding apparatus according to the present invention. It is sectional drawing which shows some cross sections of.

Referring to these drawings, the winding device of the secondary battery is for forming the electrode assembly 9 constituting the secondary battery. The electrode assembly 9 is interposed between the first electrode plate 1 and the second electrode plate 3 having different polarities, and between the first electrode plate 1 and the second electrode plate 3, respectively. The separator 5 which insulates the electrode plate 1 and the second electrode plate 3 is wound into a jelly-roll type. First and second electrode tabs (not shown) are attached to the uncoated portions of the first and second electrode plates 1 and 3. A fixing tape 30 is attached to the outermost surface of the electrode assembly 9 so that the electrode assembly 9 wound in a jelly roll type does not loosen, and ends of the first and second electrode plates 1 and 3 and the separator 5 are separated. Fix it.

The winding apparatus of the secondary battery for forming the electrode assembly as described above comprises a mandrel unit and a mandrel gap control unit.

The mandrel unit includes first and second mandrel members 131 and 133 and first and second mandrel housings 151 and 153 for fixing one end of the first and second mandrel members 131 and 133.

At least three such mandrel units are provided. That is, the first and second mandrels are rotated by a rotating plate driver (not shown) and inserted into the respective rotating holes 111 to penetrate the rotating holes 111 and at least three rotating holes 111. The first, second and third mandrel unit positions 200a, 200b, and 200c rotated by the rotation shaft 115 that may be coupled to the other ends of the members 131 and 133, respectively.

Here, one end in which the first and second electrode plates 1 and 3 and the separator 5 are stacked is inserted between the first and second mandrel members 131 and 133 spaced apart from each other.

The mandrel gap adjusting unit adjusts the gap of the first and second mandrel members 131 and 133 spaced apart from each other. That is, the mandrel gap adjusting unit includes a coupling part for coupling one end of the first and second mandrel members 131 and 133 and one end of the rotation shaft 115, and the first mandrel when the coupling part and the first and second mandrel members 131 and 133 are coupled to each other. It includes a gap adjusting portion for adjusting the gap between the member 131 and the second mandrel member 133.

The coupling part is installed on the pressure driving unit 210 and the rotation shaft 115 to select and press any one of the rotation shaft 115 inserted into the rotation hole 111 of the rotation shaft 115 and the first and second mandrel members 131 and 133. It may include a coupling member 220 to form a coupling.

The pressure driving unit 210 may be a cylinder, and selects one of the rotating shafts 115 installed on the rotating plate 110 to press one end of the rotating shaft 115 to press the rotating shaft 115 to the first and second mandrel members 131 and 133. ) Can be moved to the side. Accordingly, the pressure driving unit 210 is provided with a first pressing member 211 at the end of the drive shaft 211a connected thereto, and a first pressing member at the end of the rotating shaft 115 pressed by the first pressing member 211. A second pressing member 213 corresponding to 211 and on the contrary, may press the first pressing member 211 is installed. At this time, the rotating shaft 115 is interposed with a pressing elastic member 215 so that the rotating shaft 115 can be pressed or restored.

As shown in FIG. 5, the coupling member 220 is formed in a cylindrical shape, and a circular partition 223 having a circumference smaller than the outer diameter of the coupling member 220 is formed therein. That is, the coupling member 220 has an outer wall 221 is formed in the shape of a tube open on one side and is spaced apart from the outer wall 221, the partition wall 223 having a circumference smaller than the outer wall 221 is formed to the outer wall 221 and There is a space between the partitions 223.

At this time, one end of the first and second mandrel members 131 and 133 coupled to the coupling member 220 may be formed in a semi-circle corresponding to each other so as to be inserted between the outer wall 221 and the partition wall 223 of the coupling member 220. desirable. That is, when the gap between the first and second mandrel members 131 and 133 is minimized so that the first and second mandrel members 131 and 133 are inserted into and fixed to the first and second electrode plates 1 and 3, the first and second mandrel members 131 and 133 are fixed. The circular shape may be inserted between the outer wall 221 and the partition wall 223 of the coupling member 220.

Here, when the first and second mandrel members 131 and 133 have a circular shape, the circumference thereof should be smaller than the circumference of the outer wall 221 and larger than the circumference of the partition wall 223.

The gap adjusting part fixes the auxiliary mandrel member 135 installed inside the second mandrel members 131 and 133 and one end of the second mandrel member 133 and is inserted into one side of the second mandrel housing 153. 171, the first protrusion 173 installed on the right side of the first bracket 171 and drawn or protruded inwardly, and one end of the auxiliary mandrel member 135 to be fixed to the lower side of the first bracket 171. The second bracket 171 is installed to be inserted into the other side of the second mandrel housing 153, and the second projection 173 is installed on the left side of the second bracket 171 and is introduced or protruded inwardly .

The inner side of the first mandrel member 131 is provided with a flow member 181 which is horizontally movable to be in contact with the first and second electrode plates 1 and 3 and the separator 5. The flow member 181 may be connected to the first mandrel member 131 and the flow elastic member 181a having elasticity, and may be formed of a material having elasticity. Here, the flow elastic member 181a is a material having a slight elasticity may be urethane so as not to form scratches or the like on the outer surfaces of the first and second electrode plates 1 and 3 and the separator 5. It does not limit the material.

The fixing member 183 is installed at an inner surface of the auxiliary mandrel member 135 at a position opposite to the floating elastic member 181a. The fixing member 183 is preferably formed of the same material as the flow elastic member 181a.

Here, one supply unit (not shown) for supplying the first and second electrode plates 1 and 3 and the separator 5 is installed at one side of the first mandrel unit position 200a, and the first mandrel unit position 200a. ) And a cutting part 20 for cutting the first and second electrode plates 1 and 3 and the separator 5 is installed between the second mandrel unit position 200b and the third mandrel unit position 300c. An attachment part (not shown) for attaching the fixing tape 30 fixing the first and second electrode plates 1 and 3 and the end of the separator 5 cut by the part 20 is provided.

Hereinafter, the operation of the secondary battery winding apparatus according to the present invention having the configuration as described above will be described in detail.

First, one end of the first and second electrode plates 1 and 3 and the separator 5 is separated between the first and second mandrel members 131 and 133 from the first and second electrode plates and the separator supply unit at the first mandrel unit position 200a. Insert it in When one end of the first and second electrode plates 1 and 3 and the separator 5 are inserted, the mandrel gap adjusting unit is operated to fix the first and second electrode plates 1 and 3 to narrow the gap between the first and second mandrel members 131 and 133.

That is, when the pressure driving unit 210 is operated, the first pressing member 211 installed on the driving shaft 211a connected to the pressure driving unit 210 is driven forward to pressurize the second pressing member 213 installed on the rotating shaft 115. . Accordingly, the rotating shaft 115 is driven forward and coupled to the first and second mandrel members 131 and 133. The coupling of the rotary shaft 115 and the first and second mandrel members 131 and 133 may be performed between the first mandrel member 131 and the partition wall 223 and the outer wall 221 of the cylindrical coupling member 220 installed on the rotary shaft 115. 2 end of the mandrel 133 member is inserted in a circular shape. Therefore, the flow member 181 provided on the inner surface of the first mandrel 131 member is in contact with the inner surface of the first mandrel member 131 by the elasticity of the flow elastic member 181a and the second mandrel member ( The fixing member 183 installed in the auxiliary mandrel member 135 coupled to the inside of the 133 is in contact with the flow member 181. At this time, the second mandrel member 133 is coupled to the coupling member 220 and the first and second protrusions 163 and 173 installed on the side surfaces of the first and second brackets 171 are introduced into the first mandrel member 131. ) Is moved to the side.

Therefore, the ends of the first and second electrode plates 1 and 3 and the separator 5 inserted between the first mandrel member 131 and the second mandrel member 133 may be fixed.

Next, when the rotating plate 110 is rotated and the mandrel unit is moved to the second mandrel unit position 200b, the rotating shaft 115 is rotated to form the first and second electrode plates 1 on the outer surfaces of the first and second mandrel members 131 and 133. (3) and the separator (5) are wound in a jelly roll shape. The first and second mandrel members 131 and 133 rotated at a constant rotational speed are formed by the cutter unit 20 and the first and second electrode plates 1 and 3 and the separator 5 on the side of the first and second electrode plates and the separator supply unit. To cut.

Next, the rotating plate 110 rotates the mandrel unit to the third mandrel unit position 200b, and then attaches the fixing tape 30 to the cut ends of the first and second electrode plates 1 and 3 and the separator 5. The electrode assembly 9 is completed by attaching.

Next, the gap between the first and second mandrel members 131 and 133 is operated as described above to widen the gap.

That is, when the operation of the pressure driving unit 210 is stopped, the second pressing member 213 is driven backward by the restoring force of the pressing elastic member 215, so that the first and second brackets 161 and 171 are installed on the side surfaces of the first and second brackets 161 and 171. As the protrusions 163 and 173 are drawn out, the gap between the first and second mandrel members 131 and 133 opens, and the first and second mandrel members 131 and 133 inserted between the outer wall 221 of the coupling member 220 and the partition wall 223 are provided. Is separated. Accordingly, the flow member 181 and the fixing member 183 of the first mandrel member 131 and the auxiliary mandrel member 135 no longer fix the first and second electrode plates 1 and 3 and the separator 5. .

Thereafter, the electrode assemblies 9 wound on the outer surfaces of the first and second mandrel members 131 and 133 are separated.

According to the present invention, the winding device for the secondary battery secures the ends of the first and second electrode plates and the separator in the initial stage of winding the electrode assembly, and then the wound is released when the first and second electrode plates and the separator are cut. Is prevented.

As a result, the unwinding first and second electrode plates and the separator do not have to be rewound, thereby increasing the process efficiency.

What has been described above is only one embodiment, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, without departing from the gist of the present invention, it is common in the art to which the present invention pertains. Anyone with knowledge will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (16)

A mandrel unit into which one end of the first and second electrode plates and the separator are stacked is inserted; And And a mandrel gap control unit configured to adjust the gap of the mandrel unit to fix or release the end of the first and second electrode plates and the separator. The method of claim 1, The mandrel unit may include: first and second mandrel members spaced apart from each other to insert the first and second electrode plates and the separator therebetween; And And a first and second mandrel housings for fixing one end of the first and second mandrel members. The method of claim 2, At least three mandrel units are rotated by a rotating plate driving unit, and each of the secondary battery winding apparatuses is installed on a rotating plate having a rotating hole. The method of claim 3, wherein The rotating hole is spaced in a line with the first and second mandrel members are coupled to the first and second mandrel members, the rotating device for a secondary battery, characterized in that the rotating shaft is inserted. The method of claim 4, wherein Winding device for a secondary battery, characterized in that the rotating shaft is interposed a pressurized elastic member. The method of claim 2, The mandrel gap adjusting unit includes a coupling part for coupling the other end of the first and second mandrel members to the rotating shaft; And a gap adjusting part configured to adjust a gap between the first and second mandrel members when the coupling part and the first and second mandrel members are coupled to each other. The method of claim 6, The coupling unit is a pressure driving unit for selecting and pressing any one of the rotating shaft inserted into the rotating hole; And a coupling member installed on the rotation shaft and coupled to the first and second mandrel members. The method of claim 7, wherein The coupling member is a cylindrical battery winding device, characterized in that one side is formed in a cylindrical partition having a circular partition having a circumference smaller than the outer diameter therein. The method of claim 8, The other end of the first and second mandrel members coupled to the coupling member may include the first and second electrode plates and the separator between the first and second mandrel members so as to be inserted between the outer wall and the partition wall of the coupling member. The secondary battery winding apparatus, characterized in that formed in a semi-circle to form a circle when inserted. The method of claim 9, And the first mandrel member and the second mandrel member have a circular shape, the circumference of which is smaller than the outer wall circumference of the coupling member and larger than the partition wall circumference. The method of claim 6, The gap adjusting part may include an auxiliary mandrel member coupled to an inside of the second mandrel member; A first bracket fixed to one end of the second mandrel member and inserted into one side of the mandrel housing; A first protrusion installed on a right side of the first bracket and inserted or protruded inward; A second bracket fixed to one end of the auxiliary mandrel member and inserted under the first bracket and inserted into the other side of the mandrel housing; A secondary battery winding apparatus installed on the left side of the second bracket and including a second projection which is drawn or protruded inward. The method of claim 11, An inner surface of the first mandrel member is provided with a flow member which is in contact with the first and second electrode plates and the separator and is capable of horizontally flowing. The inner side of the auxiliary mandrel member winding device for a secondary battery, characterized in that the fixing member is installed in a position opposite to the flow member. The method of claim 12, The flow member is a secondary battery winding apparatus, characterized in that formed of a material having elasticity. The method of claim 13, The material having elasticity is a secondary battery winding device, characterized in that the urethane. The method of claim 12, The fixing member is a secondary battery winding apparatus, characterized in that formed of the same material as the flow member. The method of claim 11, The first and second protrusions of the secondary battery winding apparatus, characterized in that the elastic member is installed inside the first and second brackets, respectively.

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