KR100889767B1 - Lithium secondary battery having protection plate - Google Patents

Lithium secondary battery having protection plate Download PDF

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Publication number
KR100889767B1
KR100889767B1 KR1020020057641A KR20020057641A KR100889767B1 KR 100889767 B1 KR100889767 B1 KR 100889767B1 KR 1020020057641 A KR1020020057641 A KR 1020020057641A KR 20020057641 A KR20020057641 A KR 20020057641A KR 100889767 B1 KR100889767 B1 KR 100889767B1
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South Korea
Prior art keywords
plate
battery
lithium
protective plate
cap
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KR1020020057641A
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Korean (ko)
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KR20040026261A (en
Inventor
방선희
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삼성에스디아이 주식회사
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Priority to KR1020020057641A priority Critical patent/KR100889767B1/en
Publication of KR20040026261A publication Critical patent/KR20040026261A/en
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Publication of KR100889767B1 publication Critical patent/KR100889767B1/en

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    • Y02E60/122

Abstract

A lithium secondary battery having a protective plate is disclosed. The present invention relates to a battery unit including a positive electrode plate, a negative electrode plate, and a separator interposed therebetween; a can providing a space part in which the battery unit is accommodated; and a cap plate coupled to an upper portion of the can, a cap plate, and a cap on an outer surface thereof. A cap assembly having an electrode terminal interposed with a gasket to insulate the plate; and a safety vent formed at the bottom of the can and forming a gas discharge passage when the internal pressure rises; And a protection plate provided with a knurled portion having a predetermined pattern to be welded to the can, wherein the protrusion is securely attached to the bottom surface of the cap to a protection plate attached to protect a portion where the safety vent is formed. By forming the knurled portion having a specific range of numerical values by using the ultrasonic welding device, the reliability of the weldability is improved.

Description

Lithium secondary battery having protection plate

1 is a configuration diagram showing a state in which a protective plate is welded to a conventional can;

Figure 2 is an exploded perspective view showing a lithium secondary battery according to an embodiment of the present invention,

3 is a configuration diagram showing a state before welding the protective plate to the can of FIG.

4 is a configuration diagram showing a state after the protection plate is welded to the can of FIG. 3;

5 is an enlarged perspective view of the ultrasonic horn for welding the protective plate of FIG.

<Brief description of symbols for the main parts of the drawings>

20 ... Lithium rechargeable battery 21 ... can

22 Battery ... 23 Anode plate

24 Separator 25 ... Cathode plate

29.Safety plate 30 ... Ultrasonic horn

31.Tips 32.Protrusions

200 ... cap assembly 210 ... cap plate

270 ... protection plate

The present invention relates to a lithium secondary battery, and more particularly, to a lithium secondary battery having a protective plate welded to a protective plate having a knurled portion at the bottom of the can.

In general, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in the field of advanced electronic devices such as a cellular phone, a notebook computer, and a camcorder. In particular, the lithium secondary battery has an operating voltage of 3.6V, which is three times higher than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as power sources for electronic equipment, and is rapidly increasing in terms of high energy density per unit weight. .

The lithium secondary battery mainly uses a lithium oxide as a positive electrode active material and a carbon material as a negative electrode active material. Generally, it classifies into a lithium ion battery which uses a liquid electrolyte, and the lithium polymer battery which uses a polymer electrolyte according to the kind of electrolyte solution. Moreover, although a lithium secondary battery is manufactured in various shapes, typical shapes include cylindrical shape, square shape, and pouch type.

Lithium secondary batteries are equipped with safety vents because of the risk of explosion when internal pressure increases. Safety vents exist in various shapes, and in case of a rectangular lithium secondary battery, the thickness of a predetermined portion of the cap plate is rolled to be thinner than other portions to rupture prior to other portions, or to a can or cap plate of a predetermined size. The method of forming a safety hole, welding a thin metal plate on the upper part thereof, and breaking the part to discharge gas. In this case, a protection plate made of metal is attached to the upper portion of the safety vent to protect it during the formation process.

Referring to FIG. 1, a conventional lithium secondary battery 10 has a protective plate 12 mounted on a bottom surface of a can 11. The protective plate 12 is a clad steel sheet, and includes a nickel plate 13 and an aluminum film 14 coated on one surface thereof. The aluminum film 14 is coated on the nickel plate 13 in order to improve weldability with the can 11 made of aluminum.

In order to attach the protective plate 12 to the can 11, the protective plate 12 is aligned with the bottom surface of the can 11, and the ultrasonic wave horn 100 is used for ultrasonic welding. The position is fixed.

As described above, the conventional battery 10 does not properly weld the nickel plate 13, which is a dissimilar metal, to the can 11 made of aluminum due to the difference in physical properties, and thus, the bottom surface of the can 11 and An aluminum film 14 is formed on the bottom of the nickel plate 13 in contact. The protective plate 13 having such a cladding layer has a disadvantage in that manufacturing cost is several times higher than using a single nickel plate 13. Accordingly, a separate means for attaching a single nickel plate 13 to the bottom of the can 11 will be required.

 The present invention is to solve the above problems, to provide a lithium secondary battery having a protective plate to improve the weldability of the protective plate by forming a knurled portion of a specific shape on the protective plate attached to the bottom surface of the can. Its purpose is to.

In order to achieve the above object, a lithium secondary battery having a protective plate according to an aspect of the present invention,

A battery unit in which a positive electrode plate, a negative electrode plate, and a separator interposed therebetween are disposed;

A can providing a space part in which the battery part is accommodated;

A cap assembly coupled to an upper portion of the can, the cap assembly having a cap plate, and an electrode terminal having a gasket interposed therebetween for insulating the cap plate from an outer surface of the cap plate;

A safety vent formed at a lower portion of the can to form a gas discharge passage when the internal pressure increases; And

And a protection plate installed at an upper portion thereof to protect the safety vent and having a knurled portion having a predetermined pattern to be welded to the can.

In addition, the protective plate is characterized in that the single metal material.

In addition, the protective plate having the knurled portion is characterized in that the ultrasonic welding by the ultrasonic horn formed with a projection having the same shape as the knurled portion is fixed to the bottom of the can.

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

2 illustrates a rectangular lithium secondary battery 20 according to an embodiment of the present invention.

Referring to the drawings, the lithium secondary battery 20 may include a can 21, a battery unit 22 accommodated in the can 21, and a cap assembly 200 coupled to an upper portion of the can 21. ).

The can 21 is a rectangular metal material having a hollow formed therein, and may itself serve as a terminal. It is preferable that the said can 21 consists of aluminum materials.

The safety hole 21a is formed in the bottom surface of the can 21. The safety hole 21a is attached with a thin plate-shaped safety plate 29 thinner than the thickness of the can 21. The safety plate 29 covering the safety hole 21a is broken before other parts when the internal pressure rises due to the overcharge of the secondary battery 20, thereby serving as a safety vent to improve the safety of the battery.

The battery unit 22 accommodated in the can 21 includes a positive electrode plate 23, a negative electrode plate 25, and a separator 24. The positive and negative plates 23 and 25 and the separator 24 are each composed of one strip, and are arranged in the order of the positive plate 23, the separator 24, and the negative plate 25 to be wound.                     

The positive electrode plate 23 includes a positive electrode current collector made of a thin aluminum foil, and a positive electrode active material layer mainly composed of lithium-based oxides coated on both surfaces thereof. The positive electrode lead 26 is welded to the positive electrode plate 23 in an area where the positive electrode active material layer on the positive electrode current collector is not coated, and an end portion of the positive electrode lead 26 protrudes above the battery part 22. .

The negative electrode plate 25 includes a negative electrode current collector made of a thin copper foil and a negative electrode active material layer mainly composed of a carbon material coated on both surfaces thereof. The negative electrode lead 27 is also welded to the negative electrode plate 25 in a region where the negative electrode active material layer on the negative electrode current collector is not coated, and an end of the negative electrode lead 27 also protrudes above the battery part 22. .

Insulating tape 28 is wrapped in a portion where the positive and negative lead 26, 27 is led out of the battery unit 22 to prevent a short circuit between the electrode plates 23 and 25.

The separator 24 is made of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene. The separator 24 may be more advantageous in forming a wider width than the positive and negative electrode plates 23 and 25 to prevent a short circuit between the electrode plates 23 and 25.

A cap plate 210 is provided at the cap assembly 200 coupled to the upper portion of the can 21. The cap plate 210 is a metal plate having a size and shape corresponding to the opening of the can 21. A terminal through hole 212 having a predetermined size is formed at the center of the cap plate 210. An electrolyte injection hole 211 is formed at one side of the cap plate 210. The ball 260 is sealably coupled to the electrolyte injection hole 211.

One electrode terminal, for example, a negative electrode terminal 230, is inserted into the terminal through hole 21. The outer surface of the negative electrode terminal 230 is provided with a tubular gasket 220 to insulate the cap plate 210 and the like. An insulating plate 240 is installed on the lower surface of the cap plate 210. The terminal plate 250 is installed on the bottom surface of the insulating plate 240. The bottom portion of the negative terminal 230 is electrically connected to the terminal plate 250.

An insulating case 260 is installed on the battery unit 22 to electrically insulate the battery unit 22 and the cap assembly 200 from each other. The insulating case 260 is a polymer resin which is an insulating material, and preferably made of polypropylene.

Here, the protection plate 270 is mounted to the lower portion of the can 21 to protect the safety plate 29 covering the safety hole 21a serving as a safety vent.

The protection plate 270 stabilizes the battery structure through a series of processes such as charging, aging, and discharging with respect to the assembled battery, and the safety plate 270 is formed at the bottom of the can 21 during the chemical conversion process performed to be usable. It is mounted on the bottom of the can 21 to protect the vent and also to provide a mounting surface to which a protection circuit module is to be attached.

At this time, the protection plate 270 is formed using a separate ultrasonic welding device to form a knurling portion (knurling portion) of a specific pattern to weld firmly to the can (21).

FIG. 3 shows a state before welding the protection plate 270 on the can 21, and FIG. 4 shows a state after welding the protection plate 270 on the can 21. will be.

Referring to the drawings, the protection plate 270 is aligned with the bottom surface of the can 21. A safety plate 29 is provided on the bottom surface of the can 21 to cover the stabilization hole 21a (see FIG. 2), and the protection plate 270 is disposed on the safety plate 29. Located in The protection plate 270 covers the safety plate 29 and has a shape corresponding to the bottom surface of the can 21. At this time, the can 21 is made of a metal material, for example, aluminum, and the protective plate 30 is made of nickel.

When the protective plate 270 is aligned with the bottom surface of the can 21, the protective plate 270 is welded to the can 21 using the ultrasonic horn 30 of the ultrasonic welding device.

As shown in FIG. 5, the ultrasonic horn 30 has a plurality of protrusions 32 having a predetermined shape on the tip portion 31. An end of the protrusion 32 is a portion for pressing the upper surface of the protective plate 270.

At this time, since the can 21 and the protection plate 270 are different metals, and thus welding is difficult, the protrusions 32 are formed according to specific design rules in order to improve weldability.

That is, it is preferable that the protrusion 32 has an interval d 1 between adjacent protrusions 0.5 or 0.6 millimeters in order to improve the weldability of the protective plate 270 with respect to the can 21. If the distance d 1 between the protrusions 32 is smaller than 0.5 millimeters, portions other than the welded portions are melted and burned due to excessive frictional heat. On the contrary, when the distance d 1 between the protrusions 32 is larger than 0.6 millimeter, the frictional heat becomes weak and welding is not performed properly.

In addition, the protrusion portion 32 preferably has a height h 1 of 0.3 to 0.5 millimeters. If the height h 1 of the protrusion 32 is less than 0.3 millimeter, wear of the end of the protrusion 32 becomes severe. On the contrary, when the height h 1 of the protrusion part 32 is larger than 0.5 millimeter, excessive vibration force is transmitted to the protection plate 270 to cause damage such as penetrating the bottom of the can 21.

In addition, the protrusion 32 preferably has an angle θ 1 of an end of 70 to 90 degrees. When the end angle θ 1 of the protrusion 32 is smaller than 70 degrees, the end is sharpened and wear is severe. On the contrary, when the end angle θ 1 of the protrusion 32 is larger than 90 degrees, the weldability decreases as the surface area of the end becomes wider.

As such, the protrusion 32 formed on the tip portion 31 of the ultrasonic horn 30 is formed to have a specific range of numerical values.                     

By using the ultrasonic horn 30 having the protrusion 32 having the interval, height, and angle within the specific range as described above, the protective plate 270 which is a dissimilar metal can be firmly welded to the can 21.

That is, as shown in FIG. 4, when the protrusion 32 formed on the tip portion 31 of the ultrasonic horn 30 is in contact with the bottom surface of the protection plate 270, ultrasonic welding is performed. 21, the protection plate 270 is welded due to frictional heat caused by ultrasonic vibration.

At this time, the knurled portion 40 of the same pattern is formed on both surfaces of the protective plate 270 by the pressing force of the protrusion 32. The knurling portion 40 has a pattern substantially the same as the shape of the protrusion portion 32.

Accordingly, the interval d 2 of the knurling portion 40 is about 0.5 or 0.6 millimeters, similarly to the interval d 1 of the protrusion 32, and the height h 2 is about 0.3 to 0.5 millimeters. The end angle θ 2 of the ring portion 40 is about 70 to 90 degrees.

According to the applicant's experiment, when the ultrasonic welding of the protective plate 270 to the cap 21 using the ultrasonic horn 30 having the above-described protrusion 32 in the specific numerical range, the welding was made firm. .

As described above, the can 21 made of aluminum and the protection plate 270 made of nickel, which is another metal, use the ultrasonic horn 30 having the protrusion 32 designed to have a numerical value in a specific range. As the knurled portion 40 having the same shape as that of the protrusion 32 is formed on both surfaces of the protective plate 270, welding of the protective plate 270 to the can 21 is possible by the wedge action. Do.

The formation of the knurled portion is applicable not only to welding the protective plate 270, but also to other shapes of rectangular or cylindrical lithium secondary batteries that require bonding between dissimilar metals.

As described above, the lithium secondary battery having a protective plate of the present invention has an ultrasonic welding device having a protrusion to be firmly attached to the bottom surface of the cap to the protective plate is attached to protect the portion where the safety vent is formed. By forming a knurling portion having a numerical value in a specific range by using the above, reliability of weldability is improved. In addition, by being able to weld to the can using a single metal protective plate, manufacturing costs are reduced.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

  1. A battery unit in which a positive electrode plate, a negative electrode plate, and a separator interposed therebetween are disposed;
    A can providing a space part in which the battery part is accommodated;
    A cap assembly coupled to an upper portion of the can and installed through a cap plate and a terminal through hole formed in the cap plate, the cap assembly having an electrode terminal interposed therebetween for insulating the cap plate;
    A safety vent formed at a lower portion of the can and forming a gas discharge passage when the internal pressure increases;
    It includes; a protective plate is installed on the upper part to protect the safety vent, the knurled portion of the predetermined pattern to be welded to the can;
    The protective plate having the knurling portion is a lithium secondary battery having a protective plate, characterized in that the ultrasonic welding by the ultrasonic horn formed with a projection having the same shape as the knurling portion is fixed to the lower portion of the can.
  2. The method of claim 1,
    The protective plate is a lithium secondary battery having a protective plate, characterized in that the single metal material.
  3. The method of claim 2,
    The protective plate is a lithium secondary battery having a protective plate, characterized in that the nickel material.
  4. The method of claim 1,
    The height of the knurling portion is a lithium secondary battery having a protective plate, characterized in that about 0.3 to 0.5 millimeters.
  5. The method of claim 1,
    The knurling portion lithium secondary battery having a protective plate, characterized in that the interval of about 0.5 to 0.6 millimeters.
  6. The method of claim 1,
    The knurled portion lithium secondary battery having a protective plate, characterized in that the angle of the end is 70 to 90 degrees.
  7. delete
KR1020020057641A 2002-09-23 2002-09-23 Lithium secondary battery having protection plate KR100889767B1 (en)

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KR100889767B1 true KR100889767B1 (en) 2009-03-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013024984A3 (en) * 2011-08-12 2013-05-30 주식회사 엘지화학 Jelly-roll with improved processability and battery cell including same
KR20130142656A (en) 2012-06-20 2013-12-30 에스케이이노베이션 주식회사 Method of welding electrode tab

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KR100599598B1 (en) * 2004-05-04 2006-07-13 삼성에스디아이 주식회사 Secondary battery, electrodes assembly and plate using the same
KR100599792B1 (en) * 2004-05-19 2006-07-13 삼성에스디아이 주식회사 Secondary battery, electrodes assembly and plate using the same
KR101074780B1 (en) 2009-09-30 2011-10-19 삼성에스디아이 주식회사 Cap assembly, can, and secondary battery using the same
CN108400386A (en) * 2018-01-25 2018-08-14 柔电(武汉)科技有限公司 Improve the preparation method of the flexible battery of bending property

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JPS62252069A (en) 1986-04-24 1987-11-02 Yuasa Battery Co Ltd Manufacture of plate for battery
JPH01232667A (en) * 1988-03-11 1989-09-18 Fuji Elelctrochem Co Ltd Lead plate connecting method for battery with lead plate
JPH05205735A (en) * 1992-01-24 1993-08-13 Yuasa Corp Manufacture of electrode for battery
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Publication number Priority date Publication date Assignee Title
WO2013024984A3 (en) * 2011-08-12 2013-05-30 주식회사 엘지화학 Jelly-roll with improved processability and battery cell including same
KR101381674B1 (en) * 2011-08-12 2014-04-04 주식회사 엘지화학 Jelly-Roll of Improved Productivity and Battery Cell Comprising the Same
CN103733411A (en) * 2011-08-12 2014-04-16 株式会社Lg化学 Jelly-roll with improved processability and battery cell including same
CN103733411B (en) * 2011-08-12 2017-06-23 株式会社Lg 化学 Jelly core with the productivity ratio for improving and the battery unit including the jelly core
US10079380B2 (en) 2011-08-12 2018-09-18 Lg Chem, Ltd. Jelly-roll of improved productivity and battery cell comprising the same
KR20130142656A (en) 2012-06-20 2013-12-30 에스케이이노베이션 주식회사 Method of welding electrode tab

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