KR20150090869A - Method of manufacturing cap-assay of litium ion battery with high capacity and power and cap-assay thereof - Google Patents

Abstract

The present invention is to disclose a high capacity and large output lithium ion battery cap assembly. The high capacity and large output lithium ion battery cap assembly according to the present invention comprises: a cap plate of a plate shape wherein a bent hole, a membrane hole, and an electrode hole are perforated; a first current collector which is a first electrode to be attached to the cap plate; a second current collector which is a second electrode to be attached to the cap plate; and first and second electrode terminals to be electrically extended from the first and second electrodes, respectively. Therefore, an explosion accident can be prevented in advance by effectively inducing the leakage of internal gas if an abnormal pressure is generated in a lithium ion battery. Moreover, manufacturing efficiency can be improved by reducing transport weights with a continuous process in which components of the cap assembly are moved and reducing tact time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-capacity, high-output lithium-ion battery cap assembly and a cap assembly therefor,

The present invention relates to a cap assembly for a high-capacity, high-output lithium ion battery cap assembly, and more particularly, to a cap assembly for a high capacity, high-output lithium ion battery cap assembly capable of effectively preventing leakage of internal gas, And more particularly, to a high-capacity, high-output lithium ion battery cap assembly in which manufacturing efficiency is improved by reducing a transfer mass by a continuous process in which parts of a cap assembly are moved, thereby shortening a tact time.

2. Description of the Related Art In general, a secondary battery refers to a battery capable of being charged and discharged, unlike a primary battery that can not be charged. In the field of electronic devices such as a cellular phone, a notebook computer, a camcorder, an electric vehicle, an electric bicycle and an uninterruptible power supply Widely used. Among them, the lithium secondary battery has a higher energy density per unit weight than a nickel-cadmium battery or a nickel-hydrogen battery, and is rapidly growing.

Lithium secondary battery mainly uses lithium oxide as a cathode active material and carbonaceous material as an anode active material.

Such a lithium secondary battery is classified into a liquid electrolyte battery and a polymer electrolyte battery depending on the kind 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.

The lithium-ion battery can be classified into a can-type battery having a cylindrical shape and a square shape, and a pouch-type battery having flexibility according to the shape of the case in which the battery part is accommodated.

Particularly, since a plurality of electric automobiles and hybrid electric automobile batteries are connected in series and in parallel, a prismatic battery having a good space efficiency is required.

On the other hand, in addition to small-sized electronic devices such as cellular phones, notebook computers, and camcorders, regulations for emission of carbon dioxide gas and the like have been strengthened due to the heightened environmental protection movement. Therefore, in the automobile industry, (EV) or a hybrid electric vehicle (HEV) for use in a power supply system requiring high output and a large amount of energy as well as an automobile using fossil fuels such as a fossil fuel A sharp rise in prices is driving the development of EVs and HEVs.

In Korean Patent Laid-Open Publication No. 2009-124933, at least one of the positive electrode current collecting member 16 and the negative electrode current collecting member 18 is brought into contact with the insulating sheet 32 to form the flat electrode member 11 and the battery case 12 And the insulating sheet 32 is disposed between the protrusions 29Aa, 29Ab, 29Ba, and 29Bb and the battery case 12, At the same time, the tips of the projections 29Ab and 29Bb protrude from the battery case 12 toward the battery can 12, and the height of the protrusions is smaller than the thickness of the insulating sheet 32 Discloses a technology that is usefully used as a prismatic battery for EV to HEV, in which short-circuit failure between the positive electrode current collector and the negative electrode current collector and the battery outer can is suppressed, The abnormal pressure inside the ion battery If life is a problem that still has the risk that the lithium-ion battery explosion.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a lithium ion secondary battery capable of effectively preventing leakage of an internal gas to prevent an explosion accident, High output lithium ion battery cap assembly in which manufacturing efficiency is improved by reducing the transfer mass by shortening the tact time by a continuous process in which components of the lithium ion battery are moved.

Another object of the present invention is to provide a lithium ion secondary battery capable of effectively preventing leakage of internal gas to prevent an explosion accident when an abnormal pressure is generated in a lithium ion battery, High power lithium ion battery cap assembly assembly including a high-capacity, high-output lithium ion battery cap assembly assembly in which the transfer mass is reduced by a continuous process of reducing the tact time to improve manufacturing efficiency.

SUMMARY OF THE INVENTION In order to solve the above-described first technical problem, the present invention provides a cap plate assembly comprising: a cap plate having a vent hole, a membrane hole and an electrode hole; a first current collector assembly being a first electrode attached to the cap plate; A second current collecting unit as a second electrode attached to the cap plate, and first and second electrode terminals electrically extended from the first electrode and the second electrode, respectively. The high capacity, high output lithium ion battery cap Assembly.

According to an embodiment of the present invention, the electrode holes may be at least one.

According to another embodiment of the present invention, the first and second current collector assemblies may include first and second current collectors.

According to another embodiment of the present invention, the first and second current collectors may be patterned in a strip shape.

According to another embodiment of the present invention, the first current collector may include a first connection terminal.

According to another embodiment of the present invention, the second current collector may include a second connection terminal.

According to another embodiment of the present invention, an upper end of the first or second connecting terminal may be provided with a caulking groove having a negative angular shape.

According to another embodiment of the present invention, the first or second connection terminal may be inserted into the first or second electrode hole.

According to another embodiment of the present invention, the first or second connection terminal may be inserted into the seal groove to be inserted into the electrode hole.

According to another embodiment of the present invention, the vent unit and the membrane unit may be attached to cover the vent hole and the membrane hole.

According to another embodiment of the present invention, an insulator may be interposed between at least one of the first or second connection terminals and the cap plate.

According to another embodiment of the present invention, an insulator may be interposed between at least one of the first or second electrode terminals and the cap plate.

According to another embodiment of the present invention, the first or second electrode terminal may be connected to the first collector assembly and the second collector assembly.

According to another aspect of the present invention, there is provided a high capacity, high output lithium ion battery assembly including the cap assembly.

According to the high capacity and high output lithium ion battery cap assembly and assembly of the present invention, when an abnormal pressure is generated in the lithium ion battery, the outflow of the internal gas can be efficiently induced to prevent the explosion accident, A continuous process in which the parts of the workpiece are moved reduces the transfer mass, thereby shortening the tact time and improving the manufacturing efficiency.

1 is a flowchart showing a manufacturing method according to the present invention,
FIG. 2 is a view showing a separated view of the cap plate, the vent plate, and the membrane plate of the present invention and the first and second electrode holes having two electrode holes,
3 is a view showing a cap plate having one electrode hole of the cap plate of the present invention,
FIG. 4 is a view showing a state in which the connection terminal is attached to the cap plate when the connection terminal is one,
5 is a view showing a configuration in which the current collector of the present invention is inverted and fixed to a connection terminal,
6 is a view showing a state in which the seal ring and the insulator of the present invention are coupled to the connection terminal and fastened to the cap plate,
7 is a view showing a configuration in which an insulator of the present invention is interposed between a connection terminal and a cap plate,
8 is a view showing a shape in which an electrode terminal of the present invention is fixed to a cap plate to which a current collector assembly is coupled,
FIG. 9A is a photograph showing that the anode / cathode connection terminal according to an embodiment of the present invention is a material made of aluminum, aluminum, and copper, respectively,
FIG. 9B is a photograph showing that the anode / cathode connection terminals according to the embodiment of the present invention are formed of aluminum material and copper-nickel-plated material, respectively,
9C is a cross-sectional view of a connection terminal made of aluminum, nickel plating and aluminum and copper in Figs. 9A and 9B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. no.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention.

A method of manufacturing a high-capacity, high-output lithium ion battery cap assembly according to the present invention includes a cap plate having a flat plate shape in which a vent hole, a membrane hole, and an electrode hole are bored and a first current collector assembly And a second electrode assembly attached to the cap plate; preparing a first current collector assembly and a second current collector assembly by attaching the cap assembly to the cap plate; And connecting the first and second electrode terminals electrically extended to the electrode and the second electrode, respectively.

FIG. 1 is a flow chart showing a manufacturing method according to the present invention. FIG. 2 is a sectional view of a cap plate, a vent plate and a membrane plate of the present invention, FIG. 3 is a view showing a cap plate having one electrode hole of the cap plate of the present invention, FIG. 4 is a view showing a state where the cap plate is attached to the cap plate when the connection terminal of the present invention is one. FIG. 5 is a view showing a configuration in which a current collector according to the present invention is inverted and fixed to a connection terminal, and FIG. 6 is a view illustrating a state in which a shroud and an insulator of the present invention are coupled to a connection terminal, FIG. 7 is a view showing a configuration in which an insulator of the present invention is interposed between a connection terminal and a cap plate, and FIG. 8 is a cross- A view showing the shape hapdoen fixed to the cap plate, Figure 9 is a picture showing a cross-section of a connector according to an embodiment of the present invention.

First, in step S1, a cap plate 100 having a flat plate shape in which a vent hole 110, a membrane hole 120, and electrode holes 130 'and 130' 'are formed, and a first A first collector assembly 200 as an electrode and a second collector assembly 300 as a second electrode attached to the cap plate.

The cap plate 100 is preferably made of a metal plate having a flat plate shape so that a vent hole, a membrane hole and an electrode hole are drilled so that the vent unit 140 and the membrane unit 150 can be attached thereafter, And is ruptured first in an emergency in which an abnormal pressure is generated inside the assembly (step S11).

Accordingly, the notch (MN, VN) is provided on the surface thereof, so that the pressure to be ruptured can be easily adjusted. By controlling the thickness of the vent unit and the membrane unit or the depth of the notch, It can be used as a primary and secondary safety device.

In addition, the electrode holes 130 'and 130' 'may include at least one electrode hole 130' and a plurality of second electrode holes 130 ', respectively. In this case, both the first electrode and the second electrode may be applied to the structure in which the first electrode and the second electrode pass through the first and second electrode holes of the cap plate.

For example, in the case of the first electrode or the second electrode used as the anode, the electrode plate may be electrically connected to the cap plate. Thus, do.

The first and second collector assemblies 200 and 300 may include first and second collectors 210 and 310. The first and second collector assemblies 200 and 300 may include first and second collectors 210 and 310, The current collectors 210 and 310 may be provided in various shapes by widening the surface area so as to smoothly and efficiently flow current or holes in the electrochemical reaction. If necessary, the current collectors 210 and 310 may be formed of a thin sheet- It is also possible to apply a negative electrode mixture containing negative electrode active material on both sides of the current collector or to apply a positive electrode mixture containing a positive electrode active material on both sides of a positive electrode current collector made of thin aluminum sheet or the like.

The first or second current collectors 210 and 310 may include first or second connection terminals 220 and 320. The first or second connection terminals 220 and 320 may be connected to the first Or may be inserted into the two-electrode hole and electrically connected to the first or second electrode terminal 410 or 510 to be described later.

Here, as shown in FIGS. 4 and 5, any one of the first or second connection terminals 220 may be omitted. For example, if the first or second electrode used as an anode is energized with the cap plate, When the cap plate 100 is coupled to the cap plate 100 through means such as direct welding, riveting, or Tox, the remaining first or second electrode passes through the electrode hole 130 'through the connection terminal 220 do.

Here, the first or second current collectors 210 and 310 may include first or second connection terminals 220 and 320.

In addition, in the present invention, the welding or bonding is carried out in an oxygen atmosphere or a nitrogen atmosphere when welding is performed. Particularly, in the case where the first or second current collector includes an aluminum metal material, in the case of including a copper metal material in a nitrogen atmosphere And is fixed by welding in an oxygen atmosphere.

The oxygen atmosphere is to blow off oxygen during the welding process to adjust the ambient oxygen concentration of the workpiece and to adjust the oxygen concentration around the workpiece by blowing nitrogen during the welding process.

The oxygen atmosphere may be an oxygen content of 24 to 90%, and when oxygen is injected during the welding of copper metal, fine oxide particles on the submicron scale are formed in the welded portion to act as nuclei . Therefore, as oxygen increases, the depth of the weld bead in the weld is increased and the strength and hardness of the weld are greatly improved. However, if the oxygen content in the atmosphere exceeds 90%, the size and content of the oxide are greatly increased and the weld is rather fragile brittle), the resistance of the workpiece may also increase.

Conversely, when the oxygen content in the atmosphere is less than 24%, the weldability may be poor due to lack of bead formation at the welded portion.

In the case of the aluminum metal material, if the concentration of oxygen is high, micro-pores are generated in the welded portion to make the weld bead non-uniform, The strength is largely lowered and metal foreign matters are generated at the welded portion, so that at least the oxygen concentration should be 15% or less so that the amount of combustion gas and pore generated during welding can be suppressed. Therefore, the nitrogen atmosphere is preferably in the range of 1 to 15% of oxygen in the atmosphere. If the aluminum content exceeds 15%, there arises a problem that the welding strength is lowered and a large number of metal foreign objects are generated when the aluminum metal material is welded. Oxygen suppression of less than 1% may result in the production of aluminum nitride, which can be counterproductive and therefore disadvantageous to the process.

The upper surfaces 210 'and 310' of the first and second current collectors are positioned so as to face the floor of the workplace with the lower surfaces 220 'and 320' of the first or second connection terminals facing the work ceiling, 5, when the first or second connection terminal is positioned above the first or second current collector, a problem arises in that the yield is reduced due to an assembly deviation occurring in continuous production, and further, The lower surfaces 220 'and 320' of the first or second connection terminals are inverted so as to face upward, and the first and second connection terminals are connected to the first and second connection terminals, The upper surfaces 210 'and 310' of the current collector are reversed to face downward and are positioned and coupled as shown in FIG. 5. In the case of welding, the welding is performed in a nitrogen atmosphere or an oxygen atmosphere depending on the metal material of the current collector, Especially when the material contains copper, It is preferred. If the nitrogen atmosphere is performed in a different gas atmosphere, a large number of metallic foreign matters are generated, which is disadvantageous in the process. In the actual field, a short circuit occurs when mounted on an automobile, which may lead to shortening of life and explosion.

The first or second connection terminals 220 and 320 may be inserted into the first or second electrode holes 130 'and 130' '. In order to prevent leakage of the electrolytic solution or its vapor, And inserted into the first or second electrode holes 130 'and 130' 'as shown in FIG. 6 while being inserted into the seal gasket 230 or 330.

7, in order to prevent the cap plate or the external can from being short-circuited, a separate insulator 240 or 340 may be provided between at least one of the first or second connection terminals and the cap plate 100 It is of course possible to intervene.

Next, in step S2, the first or second connection terminals 220 and 320 are attached to the cap plate by attaching the first current collector assembly 200 and the second current collector assembly 300 to the cap plate. The cap plate 100 is assembled by inserting it.

As described above, the first or second current collectors 210 and 310 may be coupled to at least one of the first or second connection terminals 220 and 320. When the first or second current collectors 210 and 310 are both coupled to the first and second connection terminals, The first and second connection terminals are inserted into the first and second electrode holes 130 'and 130' 'and the seal rings 230 and 330 and the insulators 240 and 340 are interposed therebetween Can intervene.

Next, in step S3, the first and second electrode terminals 410 and 510 are electrically connected to the first electrode and the second electrode, respectively. The first and second electrode holes 130 ' Electrode terminals 410 and 510 which are respectively electrically extended to the upper ends of the first or second connection terminals 220 and 320 protruding through the first and second connection terminals 130 and 130 '' are riveted and welded.

First and second bolt electrode terminals 410 and 510 having a bolt-shaped contact protruding from the first and second electrode terminals 410 and 510 may be welded to the first and second electrode terminals 410 and 510, Can be combined.

The first and second electrode terminals 410 and 510 and the first and second bolt electrode terminals 400 and 500 serve as terminals of a power source for supplying electricity to an external system or vehicle.

The first or second connection terminals 220 and 320 may be caulked and welded so that the upper ends of the first or second connection terminals 220 and 320 are inserted into the terminal holes H of the first or second electrode terminals 410 and 510, 9, a caulking groove CH may be formed at an upper end of the terminals 220 and 320. [

In addition, a shorting member or an insulating material A may be interposed therebetween in order to insulate at least one of the first and second electrode terminals 410 and 510 from the cap plate 100.

If either one of the first and second connection terminals is omitted, the first or second electrode terminal 410 or 510 may be directly fixed to the cap plate 100. In this case, The electrode terminals that are not fixed to the cap plate 100 interpose the shorting member or the insulating material A for insulation from the cap plate 100. In the case of the first or second electrode terminals 410 and 510 which are directly fixed to the cap plate, The top plate B can be omitted.

An insulator may be interposed between one of the first and second connection terminals 220 and 320 and the cap plate 100. For example, the insulator may be interposed between electrodes used as a cathode.

The insulators 240 and 340 can be used without limitation as long as they have a property of insulation, but a material having durability in an electrolyte solution is preferable.

The cap assembly 600 according to the present invention includes a vent plate 110, a membrane hole 120, a cap plate 100 having a flat plate shape in which electrode holes 130 'and 130' 'are formed, A second current collecting unit 300, which is a second electrode attached to the cap plate, and a second current collecting unit 300 electrically connected to the first and second electrodes, respectively, And the first and second electrode terminals 410 and 510 are extended.

The cap assembly 600 is fabricated by the above-described method of manufacturing a cap assembly and has redundant technical elements. As a result, a small portion of the cap assembly 600 can be supplemented by the manufacturing method of the cap assembly And conversely, the description of the manufacturing method of the cap assembly can be supplemented by the following description.

The cap plate 100 is preferably made of a metal plate having a flat plate shape. The vent hole, the membrane hole and the electrode hole are drilled so that the vent unit 140 and the membrane unit 150 can be attached, It is first ruptured in an emergency in which an abnormal pressure is generated inside.

Accordingly, the pressure to be ruptured can be easily adjusted by providing a notch (MN, VN) on the surface thereof. By adjusting the thickness of the vent unit and the thickness of the membrane unit or the depth of the notch, It can be used as a secondary safety device.

In addition, the electrode hole 130 'may include at least one electrode hole 130' and at least two electrode holes 130 'and a second electrode hole 130' '. In this case, Both the first electrode and the second electrode may be applied to the structure in which the first electrode and the second electrode pass through the first and second electrode holes of the cap plate.

The first and second current collectors 200 and 300 include first and second current collectors 310 and 3310 and the first or second current collectors 210 and 310 are connected to a first or second connection terminal The first or second connection terminal 220 or 320 may be inserted into the first or second electrode hole 130 'or 130' 'of the cap plate to connect the first or second electrode terminal 410, 510, respectively.

Here, the first or second current collectors 210 and 310 may be patterned in the form of strips. The first or second current collectors 210 and 310 may be provided in various shapes with a wider surface area so as to efficiently perform an electrochemical reaction. Shaped copper foil, an aluminum foil, or the like.

The first or second current collectors 210 and 310 may be coupled to at least one of the first or second connection terminals 220 and 320. When the first or second current collectors 210 and 310 are both coupled to the first and second connection terminals, 2 connection terminals are inserted and fixed in the first and second electrode holes 130 'and 130' 'and the seal rings 230 and 330 and the insulators 240 and 340 can be interposed therebetween as described above .

That is, when there is a first or second connection terminal inserted into the first or second electrode hole, the first or second connection terminal may be passed through the remaining connection terminal or the first electrode or the second electrode may be directly connected to the cap plate Lt; / RTI >

In addition, any one of the first or second connection terminals 220 may be omitted. For example, the first or second electrode used as an anode may be electrically connected to the cap plate, When the first or second electrode is coupled through means such as direct welding, riveting, or Tox, the remaining first or second electrode passes through the electrode hole 130 'through the connection terminal 220.

In addition, the first or second connection terminals 220 and 320 may be inserted into the first or second electrode holes 130 'and 130' '. In order to prevent leakage of the electrolytic solution or its vapor Can be inserted into the first or second electrode holes 130 ', 130 "while being inserted into the seal gasket 230, 330.

In order to prevent an external can (seal) (not shown) in which the cap plate 100 or the cap plate is hermetically coupled, another insulator 240 or 340 may be connected to at least one of the first or second connection terminals And the cap plate 100. For example, the insulator may be interposed in an electrode used as a cathode.

The insulators 240 and 340 can be used without limitation as long as they have a property of insulation, but a material having durability in an electrolyte solution is preferable.

The first and second electrode terminals 410 and 510 serve as terminals of a power source for supplying electric power to an external system or an automobile.

The first or second electrode terminal 410 or 510 may be electrically connected to the upper portion of the first or second connection terminal 220 or 320. If any one of the first and second connection terminals is omitted, The one or two electrode terminals can be directly fixed to the cap plate.

In this case, the electrode terminal which is not directly fixed to the cap plate 100 interposes the shorting member or the insulating material A for insulation from the cap plate 100.

The upper or lower ends of the first or second connection terminals 220 and 320 may be inserted into the terminal holes H of the first or second electrode terminals 410 and 510 so as to be caulked and welded. 9, a caulking groove CH may be formed at the upper end of the two connection terminals 220 and 320. As shown in FIG.

As shown in FIGS. 9 (a), 9 (b) and 9 (c), the one or two connection terminals 220 and 320 need to have durability and chemical resistance depending on the electrical conductivity of the electrode and the type of electrolyte used And can be made of aluminum, copper or a hybrid thereof, and a surface-plated material.

The first and second bolt electrode terminals 410 and 510 having a bolt-shaped contact protruding from the external terminal are welded to the first and second electrode terminals 410 and 510, And the like.

Meanwhile, a high capacity, high output lithium ion battery assembly (not shown) including the above-described cap assembly according to the present invention includes a cap assembly, an outer can, and an electrolyte.

The outer can and the electrolytic solution are not particularly limited as long as they are used for a lithium ion battery, particularly an electric automobile or a hybrid electric vehicle battery, and a conventional configuration may be employed.

A vent hole 110, a membrane hole 120,
The first and second electrode holes 130 'and 130'', the cap plate 100,
The first current collector assembly 200, the second current collector assembly 300,
The first and second current collectors 210 and 310, the first and second connection terminals 220 and 320,
The first and second electrode terminals 410 and 510, the lower surfaces 220 'and 320' of the first and second connection terminals,
The upper surfaces 210 'and 310' of the first and second current collectors, the insulators 240 and 340,
The terminal plates 410, 510, the cap assembly 600

Claims (14)

A vent plate, a membrane hole, and an electrode hole;
A first current collector assembly which is a first electrode attached to the cap plate;
A second current collector assembly which is a second electrode attached to the cap plate; And
And first and second electrode terminals electrically extended from the first electrode and the second electrode, respectively.
The method according to claim 1,
Wherein the electrode hole is at least one of the electrode holes.
The method according to claim 1,
Wherein the first and second current collector assemblies include first and second current collectors.
The method of claim 3,
Wherein the first and second current collectors are patterned in the form of strips.
The method of claim 3,
Wherein the first current collector comprises a first connection terminal. ≪ RTI ID = 0.0 > 11. < / RTI >
The method of claim 3,
Wherein the second current collector comprises a second connection terminal. ≪ RTI ID = 0.0 > 11. < / RTI >
The method according to claim 5 or 6,
And a caulking groove is formed at an upper end of the first or second connection terminal.
The method according to claim 5 or 6,
Wherein the first or second connection terminal is inserted into the first or second electrode hole.
The method according to claim 5 or 6,
Wherein the first or second connection terminal is inserted into the seal cap. ≪ Desc / Clms Page number 13 >
The method according to claim 1,
And a vent unit and a membrane unit are attached to the upper portion of the vent hole and the membrane hole, respectively, so as to cover the vent unit and the membrane unit.
The method according to claim 5 or 6,
Wherein an insulator is interposed between at least one of the first or second connection terminals and the cap plate.
The method according to claim 1,
Wherein an insulator is interposed between at least one of the first or second electrode terminals and the cap plate.
The method according to claim 1,
Wherein the first or second electrode terminal is connected to the first current collector assembly and the second current collector assembly.
A high capacity, high power lithium ion battery assembly comprising the cap assembly of any one of claims 1 to 13.

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