KR101329830B1 - Secondary battery - Google Patents

Abstract

The present invention relates to a secondary battery, and more particularly, to a side cover provided on the side of the secondary battery, the outer surface portion is formed in a curved surface.

Accordingly, the technical gist of the present invention is a bare cell formed by sealing a can containing an electrode assembly with a cap assembly; A protection circuit assembly including a lead electrode unit electrically connected to the bare cell, a protection circuit board electrically connected to the lead electrode unit, and having a charge / discharge terminal and an inspection terminal; And a base cover formed on the side surface of the bare cell and covering the part of the protection circuit assembly such that the charge / discharge terminal and the test terminal are at least partially visible, and formed on a narrow side of the bare cell where the electrode terminal is formed. And a resin molding part formed of a bonding part which insulates a part of an electrode part electrically connected to each other and forms a curved part of which an outer surface is curved, and a bonding part coupling the base cover, the side cover, and the protective circuit assembly. Disclosed is a secondary battery.

Bare Cell, Cover, Surface

Description

Secondary Battery {SECONDARY BATTERY}

1 is an exploded perspective view of a bare cell for explaining embodiments according to the present invention.

2 is an exploded perspective view of a secondary battery in which no bonding portion is formed for describing embodiments according to the present invention.

3 is a perspective view of a state in which a secondary battery is coupled to explain embodiments according to the present invention.

4 to 11 are perspective views of a side cover for explaining the embodiments according to the present invention.

12 and 13 are partial exploded perspective views of a secondary battery and an external set for explaining the operation according to embodiments of the present invention.

<Explanation of symbols for the main parts of the drawings>

100; Bare cell 110; Electrode assembly

111; Anode plate 112; Cathode plate

113; Separator 114; Anode Tab

115; Negative electrode tab 120; Cans

130; Cap assembly 131; Electrode terminal

132; Insulation case 133; Terminal Plate

134; Insulating plate 135; Cap Plate

136; Insulating gaskets 137,137 ', 137' ', 137' ''; Electrode Terminal Hole

138; Electrolyte inlet stopper 139; Electrolytic solution inlet

140,140 '; Tap hole 141; Safety band

200; Protective circuit assembly 210; Lead electrode part

211; Insulator 212; Cathode Lead Electrode

213; Anode lead electrode 214; Secondary protection element

220; Protective circuit board 221; Printed circuit board

222; Charge / discharge terminals 223; Inspection terminal

224; A protection circuit 300; Resin Molding Part

310,310 ', 310' ', 310' '', 310 '' ''; Side cover

311; Curved portion 312; Mounting space

313; A pair of sides 314; Rounded corners

315; Both sides connected with rounded corners

317; Side cover groove 320; Base cover

321; Charge / discharge terminal holes 322; Inspection terminal hall

330; Bonding unit 400; Outer set

401; Battery compartment

The present invention relates to a secondary battery, and more particularly, to a side cover provided on the side of the secondary battery, the outer surface portion is formed in a curved surface.

Recently, compact and lightweight portable electric / electronic devices such as cellular phones, notebook computers, camcorders, etc. have been actively developed and produced. Therefore, portable electric / electronic devices have a battery pack built therein so that they can be operated even in a place where a separate power source is not provided. In consideration of economical aspects, the battery pack employs a secondary battery capable of charging and discharging. Representative secondary batteries include nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) secondary batteries. In particular, lithium ion secondary batteries are about three times higher in operating voltage than nickel-cadmium batteries and nickel-hydrogen batteries, which are widely used as power sources for portable electronic equipment. Further, it is widely used in terms of high energy density per unit weight.

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. Generally, a battery using a liquid electrolyte is referred to as a lithium ion battery, and a battery using a polymer electrolyte is referred to as a lithium polymer battery, depending on the kind of electrolyte, classified into a liquid electrolyte cell and a polymer electrolyte cell. In addition, the lithium secondary battery is manufactured in various shapes. Typical shapes include a cylindrical shape, a square shape, and a pouch shape.

Generally, a secondary battery is formed as follows. First, the positive electrode active material is coated on the positive electrode current collector, the positive electrode plate connected to the positive electrode tab, the negative electrode active material is coated on the negative electrode current collector, and the negative electrode plate connected to the negative electrode tab and the separator are laminated, and the electrode assembly formed by winding the electrode is formed into a can shape. It puts in the secondary battery case which consists of. Then, the electrolyte is injected and sealed with the cap assembly to create a bare cell. Subsequently, the secondary battery is completed by attaching a protective circuit board and a lead electrode to the side of the bare cell and forming a resin molding part with a molten resin or by bonding a resin molding part previously formed by a molding mold. The resin molding part formed in advance by the mold includes a side cover covering the side and a base cover covering the protection circuit assembly.

In the conventional side cover, the narrow side of the bare cell and the curved portion of the side cover are formed to be very narrowly spaced apart. Therefore, such a structure does not have a spare mounting space after mounting the protective circuit assembly, the lead electrode, and the like, and when the secondary battery is inserted into an external electronic product, it does not enter well unless it is correctly inserted.

In addition, there is a problem in that the curvature of the appearance is suddenly changed so that the appearance is not beautiful.

An object of the present invention is to solve the above problems, and to increase the mounting space of the side cover.

In addition, an object of the present invention is to adjust the curvature of the appearance to facilitate the secondary battery and product bonding, and to improve the beauty of the appearance design.

The secondary battery of the present invention for achieving the above object is a bare cell formed by sealing the can containing the electrode assembly with a cap assembly; A protection circuit assembly including a lead electrode unit electrically connected to the bare cell, a protection circuit board electrically connected to the lead electrode unit, and having a charge / discharge terminal and an inspection terminal; And a base cover formed on the side surface of the bare cell and covering the part of the protection circuit assembly such that the charge / discharge terminal and the test terminal are at least partially visible, and formed on a narrow side of the bare cell where the electrode terminal is formed. And a resin molding part formed of a bonding part which insulates a part of the electrode part electrically connected and forms a curved part having an outer surface of the outer surface, and a bonding part for coupling the base cover, the side cover, and the protection circuit assembly. .

In addition, the side cover may be further provided on the other side facing the one side of the bare cell formed side cover.

In addition, the side cover may have a mounting space therein.

In addition, the side cover may form a curved portion having an outer surface formed with a curved surface by rounding the three consecutive surfaces and one of the narrow two surfaces among the four broad surfaces of the rectangular pillar.

In addition, the side cover may be a pair of rounded chamfers facing each other among the narrow surface of the rectangular column to form a curved surface portion of the outer surface is formed in a curved surface.

In addition, the side cover may form a curved surface portion of the outer surface is curved by selectively performing any one of the rounded chamfer or angular chamfer to both sides connected to the rounded corner of the edge of the wide one surface of the rectangular column have.

In addition, a rib may be formed at one side end of the side cover of the secondary battery.

In addition, the side cover of the secondary battery may be a groove formed on the outer surface.

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

Referring to the first embodiment according to the present invention, first, as shown in Figure 2, the secondary battery is electrically connected to the bare cell 100 and the bare cell 100, the protection formed on the side of the Bessel 100 The resin molding part 300, which couples the circuit assembly 200 and the protection circuit assembly 200 and the Bessel 100, is combined.

Referring to FIG. 1, the bare cell 100 includes a positive electrode plate 111 having a positive electrode active material layer formed on a positive electrode current collector, a negative electrode plate 112 having a negative electrode active material layer formed on a negative electrode current collector, and the positive electrode plate 111 and a negative electrode plate 112. An electrode assembly 110 wound around a separator 113 which prevents a short and allows only movement of ions, and a secondary battery can 120 containing the electrode assembly 110; An electrolyte is injected into the secondary battery can 120 to enable movement of ions, and the cap assembly 130 seals the can and includes an insulating plate and an electrode terminal 111.

When the components of the bare cell 100 will be described in detail, the positive electrode plate 114 including the positive electrode tab 114 and the negative electrode plate 112 and the separator 113 including the negative electrode tab 115 are stacked and then wound. It takes the electrode assembly 110, the electrode assembly 110, which is formed to take the opening 120 and has an opening at one end, and serves to seal the opening of the can 120, the positive electrode tab 114 of the electrode assembly 110 And a cap assembly 130 electrically connected to the negative electrode tab 115.

The electrode assembly 110 is positioned between the positive electrode plate 111 having the positive electrode active material layer formed on the positive electrode current collector, the negative electrode plate 112 having the negative electrode active material layer formed on the negative electrode current collector, and between the positive electrode plate 111 and the negative electrode plate 112. Separator 113, which prevents short between the pole plates and enables movement of ions, to the positive electrode tab 114 and the negative electrode plate 112, which are bonded to the positive electrode plate 111 and electrically connected to the cap plate. It is composed of a negative electrode tab 115 is bonded and electrically connected to the electrode terminal.

Referring to the components of the electrode assembly 110 in detail, first the positive electrode plate 111 is composed of a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer may be formed of a layered compound containing lithium, a binder to improve bonding strength, and a conductive material to improve conductivity. The positive electrode collector is generally made of aluminum, and serves as a path for transferring charges generated in the positive electrode active material layer and serves to support the positive electrode active material layer. The positive electrode active material layer is attached to the wide surfaces of the positive electrode current collector, and a positive electrode non-coating portion (not shown) is formed at one end of the positive electrode plate in which the positive electrode active material layer is not formed. The positive electrode tab 114 is bonded to the positive electrode non-coating portion (not shown).

The negative electrode plate 112 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer may be made of hard carbon, which is generally used for carbon, or a binder that improves the bonding force between graphite and active material particles. As the negative electrode current collector, copper is generally used, and the negative electrode current collector serves as a movement path of charge generated in the negative electrode active material layer, and serves to support the negative electrode active material layer. The negative electrode active material layer is formed on a wide surface of the negative electrode plate 112, wherein a negative electrode non-coating portion (not shown) is formed at one end of the negative electrode plate 112, in which the negative electrode active material layer is not formed. The negative electrode tab 115 is bonded to the negative electrode plain portion.

The separator 113 is interposed between the positive electrode plate 111 and the negative electrode plate 112 to insulate the positive electrode plate 111 and the negative electrode plate 112 and allow electric charges of the positive electrode plate 111 and the negative electrode plate 112 to pass therethrough. Generally, the material of the separator 113 uses polyethylene (PE) or polypropylene (PP), but the material is not limited thereto. The separator 113 may include an electrolyte and may be configured in a liquid or gel form.

The positive electrode tab 114 and the negative electrode tab 115 serve to electrically connect the electrode assembly 110 and the electrical terminal of the external device. The positive electrode tab 114 and the negative electrode tab 115 of the positive electrode plate 114 are not shown. It is bonded to the negative electrode non-coating portion (not shown). The positive electrode tab 114 and the negative electrode tab 115 are generally made of aluminum, aluminum alloy or nickel or nickel alloy, but the material is not limited thereto.

The can 120 accommodates the electrode assembly 110 and houses the insulating case 132 inside the opening of the can. In addition, when the separator does not include an electrolyte among the components of the electrode assembly 110, the electrolyte may be accommodated inside the can. The material of the can is mainly aluminum, but is not limited to the material in the present invention. The shape of the can is rectangular or has a shape in which the corners of the can have rounded corners. The opening of the can is sealed by welding or heat fusion with the cap plate 135. In this case, an insulating case 132 for insulating the positive electrode tab 114 and the negative electrode tab 115 while protruding to the outside is seated.

The cap assembly 130 may include an electrode terminal 131 electrically connected to the negative electrode tab 115 of the electrode assembly 110, an insulating case 132 seated inside an opening of a can containing the electrode assembly 110, A terminal plate 133 seated on a wide surface of the insulating case 132 and electrically connected to the electrode terminal, insulates an outer surface of the terminal plate 133, and the electrode terminal 131 and the terminal plate 133. ) Is provided with an insulating plate 134 having a hole 141 for connection, an electrolyte injection hole 142 and an electrode terminal hole 143, and a cap plate 135 covering the opening of the can 120. An electrolyte injection hole plug 138 surrounding a portion of the electrode terminal and sealing the electrolyte gasket 136 coupled to the electrode terminal hole 143 of the cap plate 135 and the electrolyte injection hole 139 of the cap plate 135. Is done.

First, the electrode terminal 131 is inserted with the insulating gasket 136 interposed in the central hole of the cap plate 135.

The insulating case 132 is seated inside the opening of the can 120 and covers the upper surface of the electrode assembly interposed inside the can. The insulating case forms a wall so that the terminal plate 133 and the insulating plate 134 covering the terminal plate 133 can be seated. The insulating case is spaced apart from the positive electrode tab 114 and the negative electrode tab 114 by a predetermined distance to prevent a short between the negative electrode and the positive electrode, and the tab holes 140 and 140 'protrude from the positive electrode tab 114 and the negative electrode tab 115. To form.

The terminal plate 133 is electrically connected to the electrode terminal 131 and also to the negative electrode tab 114. Between the electrode terminal 131 and the negative electrode tab 114, the cap plate 135 and the electrode terminal 131 formed to cover the insulating plate 134 and the can 120 to insulate the terminal plate 133. An insulating gasket 136 that insulates the interlayer is interposed therebetween, and is connected through electrode terminal holes 137, 137 ′, 137 ″, and 137 ′ ″.

The insulating plate 134 surrounds the terminal plate 133 and has an electrode terminal hole 137 ′ through which the electrode terminal 131 with the insulating gasket 136 interposed therebetween is formed. The insulation plate 134 is wrapped around the terminal plate 133 on one surface of the insulation case 132.

The cap plate 135 may be formed to cover the opening of the can 120, and an electrode terminal hole 137 ″ may be formed to allow a body portion of the electrode terminal 131 having the insulating gasket 136 to pass therethrough. It is. An electrolyte inlet 139 is formed at one end of the 켑 plate to inject the electrolyte, and a safety van 141 is installed to prevent explosion when the internal pressure rises due to the overload of the electrode assembly 110.

The insulating gasket 136 surrounds the electrode terminal 131 and is interposed between the cap plate 135 and the electrode terminal 131 through an electrode terminal hole 137 ′ ″, and the cap plate 135 and the electrode terminal ( 131 is insulated.

The electrolyte injection hole stopper 138 blocks the electrolyte injection hole 139 formed on the top surface of one end of the cap plate. The electrolyte injection hole stopper 138 is welded or pressed to the electrolyte injection hole 139 of the insulating case 132.

As shown in FIG. 2, the protection circuit assembly 200 includes a protection circuit board 220 and a lead electrode unit 210, and is positioned on the side of the Bessel 100 and electrically connected to the bare cell 100. It is connected, and is coupled to the bare cell 100 by the resin molding 300.

First, the protection circuit board 220 is mounted on a printed circuit board 221 having a wiring pattern formed therein with a plurality of electrical elements, and the cathode lead electrode 212 and the anode lead electrode 213 are connected to the printed circuit board 221. It is electrically connected. On one side of the printed circuit board 221, a protection circuit unit 224 is formed to mount the charge / discharge and charge / discharge state check circuit and safety circuit to manage the overall operation of the secondary battery. One side of the printed circuit board 221 is provided with a charge / discharge terminal 222 and the test terminal 223, the charge / discharge terminal hole 321 and the test terminal hole 322 of the bears cover 320 The terminal surface is exposed through.

An insulator 211 is formed between the cathode lead electrode 212 and the bare cell 100 to insulate the cathode lead electrode 212 and the bare cell 100. The anode lead electrode 213 is electrically connected to a narrow side of the can of the bare cell 100. Also, an insulator 211 is formed between the anode lead electrode 213 and the bare cell 100 to insulate the anode lead electrode 213 and the bare cell 100. In this case, a secondary protection element 214 may be formed between the cathode lead electrode 212 or the anode lead electrode 213 and the printed circuit board 221. The secondary protection element 214 may include a PTC element, a bimetal or a thermal fuse. Can be used. When the PTC device is used as the secondary protection device, the insulation device may be surrounded by an insulating tape several times or coated with an insulating material to insulate the bare cell 100 from the surroundings.

The resin molding part 300 covers a part of the protection circuit assembly 200 such that the charge / discharge terminal 222 and the test terminal 223 are at least partially visible, and a base cover formed on the side of the bare cell 100. 320; The electrode terminal 131 is formed on a narrow side of the bare cell 100, the bare cell 100 and the lead electrode portion 210 is insulated a part of the electrically connected, the outer surface is curved It is formed to include a side cover 310, the base cover 320 and the side cover 310 and the protective circuit assembly 200 to form a curved surface portion 311 (not shown).

Referring to FIG. 3 further, the side cover 310 forms a curved portion 311 whose outer surface is curved. The curved portion 311 may be formed in a semi-circular arc shape or a semi-elliptic shape when the cross section of the side cover 310 is cut and viewed in cross section. In addition, one side end of the side cover 310 may be rounded chamfered to form a curved portion 311. 12 and 13, when the secondary battery SB to which the side cover 310 having the curved portion 311 is coupled is coupled to the battery accommodation space 401 of the outer set 400 in the direction of an arrow, Facilitate product bonding. In this case, the external set 400 may be a battery storage space of a charger / discharger and an electronic product.

In addition, as shown in FIG. 3, the side cover 310 may be further provided on the other side of the bare cell 100 in which the side cover 310 is formed. As shown in FIG. 12, when the secondary battery SB further including the side cover 310 is inserted into the outer set 400 in the direction of the arrow, the left / right side is affected by the formed curved portion 311 on the left / right sides. Regardless of the direction of the sliding action is so easy to bind.

In addition, as shown in Figure 4, the side cover 310 may be provided with a mounting space (312). The side cover 310 may include a mounting space 312, and may cover a part of the insulator 211, the anode lead electrode 213, and the cathode lead electrode 214 of FIG. 2, and the mounting space 312 may be Space may remain even after the insulator 211 and the anode lead electrode 213 are mounted. In the remaining space, the components of the protection circuit assembly 200 of FIG. 2 may be mounted and utilized, or a member (not shown) for shock absorption or a rib (not shown) or a member (not shown) for improving strength and coupling force may be used. ) May be formed. In addition, when the safety element 214 of FIG. 2 is mounted or the safety vent 141 of FIG. 1 is opened, a space in which electrolyte may be collected may be formed.

As shown in FIG. 3, the base cover 320 surrounds a portion of a protection circuit assembly (not shown), and exposes the terminal surfaces of the charge / discharge terminal and the test terminal to expose / discharge the external circuit. Charge / discharge terminal holes 321 and test terminal holes 322 are provided to perform a state check.

As shown in FIG. 3, the bonding unit 330 couples the base cover 320, the side cover 310, and the protection circuit assembly 200 of FIG. 2 by using a molten resin or a bond.

Referring to FIG. 5, the side cover 310 ′ is full-rounded on three consecutive surfaces and one of two narrow surfaces of the rectangular pillars. The outer surface may form a curved portion 311 formed in a curved surface. When the secondary battery includes the side cover 310 ′ on which the curved portion 311 is formed, as shown in FIGS. 12 and 13, the secondary battery SB is disposed in the battery accommodating space 401 of the external set 400. When inserted, the curved portion 311 induces sliding to facilitate product coupling, and also visually looks beautiful.

Referring to the third embodiment according to the present invention with reference to Figure 6, the side cover 310 '' is a pair of sides 313 facing each other of the narrow surface of the rectangular pillar rounded chamfered surface of the outer surface The curved portion 311 may be formed. When the secondary battery includes the side cover 310 ″, as shown in FIG. 13, when the secondary battery SB is inserted into the battery accommodation space 401 of the external set 400, the curved portion 311 is provided. Under the influence of the thickness region of the secondary battery is easily accommodated by sliding, there is another beautiful appearance.

Referring to the fourth embodiment according to the present invention with reference to Figure 6, the side cover 310 '' is rounded to both sides 315 connected to the rounded corner 314 of the corner of the wide one side of the rectangular pillar By selectively performing any one of chamfering or chamfering to form a curved portion formed with a curved surface of the outer surface, when rounded chamfered, the side cover having a rounded chamfered curved portion 311 as shown in FIG. 310 '' 'is formed. When each chamfered, as shown in FIG. 8, a side cover 310 ″ ″ having each chamfered curved portion 311 is formed. When the secondary battery includes the side covers 310 ′ ″ and 310 ″ ″, when the secondary battery SB is inserted into the external set 400 as shown in FIG. 12, the curved portion 311 is provided. By sliding, the secondary battery is easily inserted, and the beauty of the appearance is changed.

9 and 10, the side cover 310 may have a rib 316 formed at one side end thereof. First, as shown in FIG. 9, the rib 316 may be formed in the storage space 312 at one side end of the side cover 310. At this time, the rib 316 may be made of a plurality. Alternatively, as shown in FIG. 10, a rib 316 may be formed at an end of one side end of the side cover 310. The rib 316 increases the strength by reinforcing the side cover 310, and when the side cover 310 is coupled by the bonding portion 330 of FIG.

Referring to the sixth embodiment of the present invention with reference to Figure 11, the side cover 310 may be formed with a groove 317 on the outer surface. The shape of the groove 317 formed in the side cover 310 may be made of a polygon or a circle or a mixture of polygons and circles. The secondary battery having the groove 317 is formed to increase the bonding force by providing a fixing means when coupled to the outer set 400 of FIG. Another use of the groove 317 may be a label or identification member.

The present invention is not limited to the technical spirit of the specific embodiments or drawings described above, and those skilled in the art without departing from the gist of the invention claimed in the claims Various modifications are possible, of course, and such changes are within the scope of the claims of the present invention.

The present invention can secure the mounting space of the upper cover and the lower cover to further mount the protection circuit assembly and other members, the effect of adjusting the curvature of the appearance to make the secondary battery and the product easily and visually look smooth. have.

Claims (8)

A bare cell formed by sealing a can containing the electrode assembly with a cap assembly provided with an electrode terminal; A protection circuit assembly including a lead electrode unit electrically connected to the bare cell, a protection circuit board electrically connected to the lead electrode unit, and having a charge / discharge terminal and an inspection terminal; And A base cover formed on a side surface of the bare cell and covering a part of the protection circuit assembly such that at least a portion of the charge / discharge terminal and the test terminal are visible, and formed on a narrow side of the bare cell where the electrode terminal is formed, and the bare cell and the lead electrode A secondary cover comprising: a resin molding part formed of a bonding part for coupling the base cover, the side cover, and the protection circuit assembly to the side cover, which insulates a part of the additional electrically connected part and forms a curved part of which the outer surface is curved. battery. The method of claim 1, Secondary battery, characterized in that the side cover is further provided on the other side facing the one side of the bare cell formed side cover. The method of claim 1, The side cover is a secondary battery having a mounting space therein. The method of claim 1, The side cover is a secondary battery, characterized in that the continuous three of the four broad surfaces of the rectangular column and one of the narrow two surfaces is rounded to form a curved surface portion of the outer surface is curved. The method of claim 1, The side cover is a secondary battery characterized in that a pair of rounded chamfers facing each other of the narrow surface of the rectangular pillar to form a curved surface portion of the outer surface is curved. 6. The method of claim 5, The side cover may be a curved chamfer or an angular chamfer selectively to both sides connected to the rounded corners of the corners of the wide one surface of the rectangular column to form a curved surface portion formed with a curved surface of the outer surface Secondary battery. The method of claim 1, The side cover is a secondary battery, characterized in that ribs are formed on one side end. The method of claim 1, Side cover of the secondary battery is a secondary battery, characterized in that the groove is formed on the outer surface.

Images