KR100627369B1 - Assembling Method of Secondary Battery and Secondary Battery - Google Patents

Abstract

A secondary battery according to the present invention includes a separator, an electrode group including a positive electrode plate and a negative electrode plate disposed on both sides of the separator, a case in which the electrode group is embedded, and an outer case coupled to the case and sealing it and electrically connected to the electrode group. The cap assembly includes a cap assembly provided with a terminal, and the cap assembly includes a cap plate, a fastening member installed above the cap plate, and a gasket installed below the cap plate, in which a through hole into which the external terminal is inserted is formed. The gasket is made of a material having insulation and elasticity and is composed of a square shape that can be fitted to the flange of the external terminal, so that the fastening of the external terminal is not released and the insulation can be maintained with the inner wall of the case.

Gasket, External Terminal, Tubular Fastening Member, Flange

Description

Assembly method of secondary battery and secondary battery {SECONDARY BATTERY AND METHOD FOR ASSEMBLING SECONDARY BATTERY}

1 is a schematic cross-sectional view of a rechargeable battery according to an exemplary embodiment of the present invention.

2 is an exploded perspective view illustrating in detail a terminal installation structure of a rechargeable battery according to an exemplary embodiment of the present invention.

3 is a perspective view illustrating a structure of various terminal flanges of a secondary battery and a gasket coupled thereto according to an embodiment of the present invention.

4 is a cross-sectional view illustrating a terminal installation state of a secondary battery according to an exemplary embodiment of the present invention.

The present invention relates to a secondary battery, and more particularly, to a method for assembling a secondary battery and a secondary battery having improved installation structure of an external terminal.

In general, a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged. Recently, a high output secondary battery using a high energy density nonaqueous electrolyte is being developed, and one battery cell is a pack type. In the case of low-capacity batteries that are packaged in small batteries, portable electronic devices such as phones, notebook computers, and camcorders are used. By connecting the two in series or in parallel to form a large capacity secondary battery.

The secondary batteries are manufactured in various shapes, and typical shapes include cylindrical and rectangular shapes. The secondary batteries are wound in a vortex through a separator, which is an insulator, between the two bands and the negative electrode plate. , Jelly roll), or a plurality of positive electrode plates, negative electrode plates, and separators are stacked to form an electrode group, and then built in the case, and a cap assembly having external terminals formed on the case is configured to constitute a battery.

As described above, the cap assembly of the secondary battery has an external terminal electrically connected to the electrode plate of the electrode group, and is assembled in a state of being kept airtight with the cap assembly. There is a problem that the assembly is not stable.

That is, in the case of the conventional secondary battery, a through hole for terminal installation is formed on the cap plate constituting the cap assembly, and an external terminal fitted into the through hole has a flange formed at an end thereof, and is insulated from the through hole of the cap plate. Gaskets and O-rings are installed to maintain electrical insulation and airtightness between the cap plate and the outer terminals.

In addition, a washer is inserted from the outside and a nut is fastened to the external terminal that protrudes through the through hole of the cap plate. As the nut is tightened, the terminal rotates as the nut is tightened, resulting in loose assembly. Can occur, and thus the assembly process is complicated.

In addition, there is a problem that the flange of the external terminal is energized with the inner wall of the case when the external terminal is assembled to the cap assembly.

Therefore, the present invention is to solve the above problems, an object of the present invention is to improve the coupling structure of the cap plate and the external terminal of the secondary battery to facilitate the assembly to reduce the time and effort required for assembly The present invention provides a method for assembling a secondary battery and a secondary battery.

In addition, the present invention provides a structure of a component that can prevent the rotation of the terminal when the cap plate of the secondary battery and the external terminal is coupled to facilitate the assembly and improve the insulation of the case and the external terminal to increase the stability Another object is to provide a method for assembling a secondary battery and a secondary battery.

In order to achieve the above object, a secondary battery of the present invention includes a separator, an electrode group including a positive electrode plate and a negative electrode plate disposed on both sides of the separator, a case in which the electrode group is built, and a case combined with the case to seal the electrode group. And a cap assembly having an external terminal electrically connected to the cap assembly, wherein the cap assembly includes a cap plate, a fastening member installed above the cap plate, and a cap member formed below the cap plate. It is configured to include a rectangular gasket.

The outer terminal has an upper end exposed to the outside through the cap plate, a lower end formed with a tab inwardly passing through the cap plate and in contact with the electrode group, and easily coupled to the cap plate around the lower end. It consists of a flange formed for the purpose, the flange is configured in the form of a prisms, preferably in the form of a square pillar, more preferably a hexagonal pillar.

On the other hand, the shape of the gasket is also configured in the form of a box so as to match the shape of the flange, the gasket is a top plate portion formed with a through hole through which the external terminal penetrates, vertically extending downward from the top plate portion and the top plate portion It is preferable that it has a side part which encloses, and the said upper board part is comprised from polygonal shape, Preferably it is a rectangle and a hexagon.

The diameter of the gasket is substantially the same as the diameter of the flange, the height of the gasket is substantially the same as the height of the flange, the gasket is made of PPS or PP material having insulation and elasticity.

The fastening member includes a tubular fastening member consisting of a tubular part having a diameter equal to the outer terminal and a tubular flange formed around the tubular part, and the tubular fastening member is also made of PPS or PP material having insulation and elasticity. It is easy to combine and improve insulation.

The tubular portion of the tubular fastening member protrudes below the cap plate through the through hole of the cap plate, and the gasket is installed around the tubular portion protruding below the cap plate.

According to another aspect of the present invention, the secondary battery includes the step of installing the tubular fastening member through the through hole formed on the cap plate constituting the cap assembly, and the tubular portion of the tubular fastening member passing through the through hole of the cap plate. Fitting the through-holes of the rectangular gasket to the outside, projecting the external terminals to the outside of the cap plate through the through-holes of the gaskets, and contacting the side surfaces of the gaskets with the flanges of the external terminals. .

Here, the secondary battery may have a rectangular or cylindrical structure in which an electrode group is wound in a jellyroll shape and installed in a rectangular or cylindrical case, and preferably, rectangular.

In addition, the secondary battery is a device that operates by using a motor such as a hybrid electric vehicle (HEV), an electric vehicle (EV), a wireless cleaner, an electric bicycle, an electric scooter, and the like, and is used as an energy source for driving the motor of the device. Can be used

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

Hereinafter, a description will be given of a rectangular secondary battery in which a positive terminal and a negative terminal, which are external terminals, are provided on a cap plate constituting a cap assembly. The present invention is not limited to the following structures, and of course, the present invention can be applied to various structures such as cylindrical batteries.

1 is a schematic cross-sectional view of a rechargeable battery according to an exemplary embodiment of the present invention.

Referring to the secondary battery with reference to the drawings, the secondary battery is the electrode group 10, the positive electrode plate 11 and the negative electrode plate 12 is positioned with the separator 13 between, and the electrode group 10 It is configured to include a case 20 having a space portion to be embedded, the cap assembly 30 is installed in the opening of the case. The cap assembly 30 is installed in an opening of the case 20 to electrically connect the cap plate 31, the positive and negative plates and the tab 15 to seal the case, and to the cap plate 31. Both the positive and negative electrode terminals 16 and 17 assembled and protruded outward, the positive and negative electrode terminals 16 and 17 are circumscribed so as to facilitate the coupling between the negative electrode terminals 16 and 17 and the cap plate 31. A gasket for engaging the outer terminal with the cap plate 31 and preventing the outer terminal from being energized with the inner wall of the case, provided under the through hole 32 on the flange 18 and the cap plate 31 formed in the 39) and a fastening member 50 installed above the cap plate 31 to fasten the external terminals 16 and 17 to the cap plate 31.

Wherein the case 20 is made of a conductive metal such as aluminum, aluminum alloy or nickel plated steel, the shape is a hexagonal or cylindrical or other shape of the cube having an internal space portion in which the electrode group 10 is located Is done.

In the following embodiment, a structure in which the positive electrode terminal 16 and the negative electrode terminal 17 are disposed on the same surface as a rectangular secondary battery will be described as an example.

In addition, in the present embodiment, the electrode group 10 is wound on the vortex in a state in which the positive electrode plate 11 and the negative electrode plate 12, in which each active material is coated on the current collector, are laminated with the separator 13 interposed therebetween. It is made of a formed jelly roll type, the uncoated portion 11a of the positive electrode plate and the uncoated portion 12a of the negative electrode plate are disposed opposite the width direction of the separator, that is, at both ends of the electrode group 10 with respect to the separator 13, The uprights 20 of the electrode assembly 10 may be positioned on both sides of the case 20 based on when the cap assembly 30 is placed up and down. The positive and negative terminals 16 and 17 of the cap assembly are electrically installed through the tabs 15 (or current collector plates) respectively installed in the non-coated portions 11a and 12a at both ends of the electrode group 10. Connected.

The positive electrode terminal 16 and the negative electrode terminal 17 are externally threaded on the upper end exposed to the outside through the cap plate 31, and the flange 18 is formed on the lower end of the cap plate 31. ) Is formed to be in close contact with the inner side surface of the gasket 39 disposed below the through hole 32. In the present embodiment, preferably, the flange is configured in the form of an angular column, preferably in the form of a square column, more preferably in the form of a hexagonal column.

Hereinafter, the configuration of the cap assembly will be described in more detail with reference to FIGS. 2 and 3. 2 is an exploded perspective view illustrating in detail a terminal installation structure of a secondary battery according to an exemplary embodiment of the present invention, and FIG. 3 is a view illustrating a structure of various terminal flanges of the secondary battery and a gasket coupled thereto according to an exemplary embodiment of the present invention. It is a perspective view.

2 and 3, the gasket 39 is configured in the form of a box that can be matched to the shape of the flange 18 of the external terminals 16, 17, the gasket 39 is an external terminal An upper plate portion 39b having a through hole 39a therethrough, and a side portion 39c extending vertically downward from the upper plate portion 39b and surrounding the upper plate portion 39b, wherein the upper plate portion is polygonal, preferably Is preferably composed of a rectangle and a hexagon.

According to this embodiment here, the gasket 39 has a diameter D or a height H that is substantially equal to the diameter D or height H of the flange 18 of the outer terminals 16, 17. Although formed of a PPS or PP material having insulation and elasticity, the coupling with the external terminals 16 and 17 is simply performed through the space formed under the upper plate portion 39b of the gasket 39. The upper plate portion of the gasket 39 having elasticity to the upper and side surfaces of the rigid flange 18 of the outer terminals 16 and 18, and the upper end portion of the outer terminals 16 and 17 into the through hole 39a formed in the 39b) and side part 39c by pushing it apart. Thus, the gasket 39 may be hermetically coupled to the flange 18. Meanwhile, since the flanges 18 and the gaskets 39 are formed in square shapes as shown in FIGS. 2 and 3, the female screw and the external terminal 16 of the washer 52 or the nut 51 are formed. The gasket 39 and the flange 18 are not peeled off by the rotational force when the male screw formed at the upper end of the 17 is rotated and tightened in one direction.

Meanwhile, the gasket 39 may be disposed below the cap plate 31 by a fastening member 50 provided above the cap plate 31. At this time, the fastening member 50 is a tubular fastening consisting of a tubular part 53a having the same diameter as the external terminal besides the washer 52 and the nut 51 and a tubular flange 53b formed around the tubular part 53a. Further comprising a member 53 may be installed below the cap plate 31 via the tubular fastening member 53. That is, the tubular fastening member 53 is made of PPS or PP material having insulation and elasticity, and the tubular portion 53a is lowered through the cap plate 31 through the through hole 32 of the cap plate 31. The gasket 39 is installed around the protruding tubular portion 53a when protruded to the upper side, and the upper ends of the external terminals 16 and 17 are fitted through the through holes 39a of the gasket 39 to be engaged. This cap assembly can be combined.

Hereinafter, an organic coupling relationship between components of a cap assembly of a secondary battery according to an exemplary embodiment of the present invention will be described with reference to FIG. 4. 4 is a cross-sectional view illustrating a terminal installation state of a secondary battery according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the gasket 39 has a structure covering the flanges 18 of the external terminals 16 and 17. That is, according to the figure, the gasket 39 is closed at one end thereof by the upper plate portion 39b and extends vertically downward from the upper plate portion 39b to the side portions 37c of the outer terminals 16 and 17. Each side surface of the square flange 18 is covered, and since the diameter of these flange 18 and the diameter of the said upper plate part 39b are the same, the side part 39c of the gasket 39 on each side surface of the said flange 18 is carried out. (In the case of a square pillar flange, the four side surfaces and the four side surfaces of the gasket 39 corresponding to the respective side surfaces thereof face each other. Accordingly, when the gasket 39 is installed on the flange 18 of the external terminals 16 and 17, the side portion 39c covers the side surface of the flange 18, and the upper plate portion 39b is the flange 18. By covering the upper surface of the () to surround the side surface of the flange 18 of the external terminal (16, 17) to prevent the case is energized. In addition, when the fastening member 50 is coupled to the upper ends of the external terminals 16 and 17, the square gasket 39 is rotated by the rotational force and is not separated from the flange 18.

In the case of the above structure, the flanges of the external terminals 16 and 17 are not connected to the gasket 39 and the external terminals 16 and 17 by the elasticity of the gasket 39 itself. (18) may be hermetically coupled.

As described above, the secondary battery and the battery module of the present invention may be effectively used when the internal pressure of the battery is high as a motor driving battery requiring high power / large capacity, but the use thereof is not necessarily limited thereto.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, according to the present embodiment, as a component of the cap assembly, a gasket is provided inside the case, and the gasket is made of a material having insulation and elasticity, and is formed in a square shape that can be fitted to the flange of the external terminal to form an external terminal. The rotation is not terminated by the rotation when the rotation of the, there is an effect that can maintain the insulation and the inner wall of the case.

Claims (17)

An electrode group including a separator and a positive electrode plate and a negative electrode plate disposed on both sides of the separator; A case in which the electrode group is built; And a cap assembly coupled to the case to seal the case and having an external terminal electrically connected to the electrode group. The cap assembly includes a cap plate having a through hole into which the external terminal is inserted, a fastening member installed above the cap plate, and a rectangular gasket installed below the cap plate. The method of claim 1, The outer terminal has an upper end portion exposed to the outside through the cap plate, a lower end portion formed with a tab inwardly passing through the cap plate to contact the electrode group, and easily coupled to the cap plate around the lower end portion. A secondary battery composed of flanges, which are formed in order to form pillars. The method of claim 2, The flange is a secondary battery consisting of a square pillar or a hexagonal pillar. The method of claim 1, The outer terminal has a square flange, The fastening member includes a tubular fastening member consisting of a tubular part into which the external terminal is fitted and a tubular flange formed around the tubular part. The gasket has a polygonal upper plate portion having a through hole through which the external terminal passes, and a side portion extending downward from the upper plate portion to surround the upper plate portion, wherein the side portion is in close contact with the flange. The method of claim 2, The gasket is a secondary battery in the form of a box mating with the flange of the external terminal. The method of claim 5, The gasket includes a top plate portion having a through hole through which the external terminal penetrates, a side portion extending downward from the top plate portion and surrounding the top plate portion, wherein the top plate portion is polygonal. The method of claim 6, Secondary battery of the upper plate is rectangular. The method of claim 6, The secondary battery of the upper plate is hexagonal. The method of claim 5, A secondary battery of which the diameter of the gasket is substantially the same as the diameter of the flange. The method of claim 5, Secondary battery, the height of the gasket is substantially the same as the height of the flange. The method of claim 1, The gasket is a secondary battery made of a PPS or PP material having insulation and elasticity. The method of claim 1, The fastening member includes a tubular fastening member including a tubular portion having the same diameter as the outer terminal and a tubular flange formed around the tubular portion. The method of claim 12, The tubular fastening member is a secondary battery made of a PPS or PP material having insulation and elasticity. The method of claim 12, The tubular portion of the tubular fastening member protrudes downwardly through the cap plate through the through hole of the cap plate, and the secondary battery is provided with the gasket around the tubular portion protruding downwardly from the cap plate. The method of claim 1, The secondary battery is a rectangular secondary battery. The method of claim 1, The secondary battery is a secondary battery for driving a motor. Installing a tubular fastening member through the through hole formed on the cap plate constituting the cap assembly; Inserting the through hole of the square gasket into the tubular portion of the tubular fastening member passing through the through hole of the cap plate; Protruding an external terminal out of the cap plate through the through hole of the gasket; Contacting side surfaces of the gasket with the rectangular flange of the external terminal Assembly method of a secondary battery comprising a.

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