KR20060102747A - Battery pack case, pouch-type li secondary battery with the pack case and method of fabricing the same - Google Patents

Abstract

The present invention relates to a battery pack case, a pouch-type lithium secondary battery, and a method for manufacturing the battery pack case, the upper case and the lower case of which are coupled in a sliding structure to simplify the battery pack case, and the high strength material can be used for the lower case. The battery pack case of the present invention comprises: an upper case having a space for accommodating a pouch core pack; A lower case covering the upper case; It is made of a structure having a sliding coupling means formed in the upper case and the lower case.

Pouch type lithium secondary battery, battery pack case, sliding coupling means

Description

Battery Pack Case, Pouch Type Lithium Secondary Battery and Manufacturing Method Thereof {Battery Pack Case, Pouch-type Li Secondary Battery with the Pack Case and Method of fabricing the same}

Figure 1a is a perspective view showing a state before the pouch packaging material of the pouch-type lithium secondary battery according to an embodiment of the present invention is sealed.

1B is a perspective view showing a state before assembling the battery pack case after the protection circuit module of the pouch-type lithium secondary battery according to the embodiment of the present invention is attached.

Figure 2a is a perspective view for explaining the upper case of the battery pack case of the pouch-type lithium secondary battery according to an embodiment of the present invention.

Figure 2b is a perspective view for explaining the lower case of the battery pack case of the pouch-type lithium secondary battery according to an embodiment of the present invention.

(Explanation of symbols for main parts of drawing)

100; Pouch type lithium secondary battery 110; Electrode assembly

111; A first electrode plate 112; Second electrode plate

113; Separator 114; First electrode tab

115; Second electrode tab 116; Insulation tape

120; Pouch sheath 121; if

121a; Space 122; Top

123; Junction 130; Protection circuit board

141; Upper case 145; Lower case

147a, 147b; Sliding engagement means

The present invention relates to a battery pack case, a pouch-type lithium secondary battery, and a method for manufacturing the same. More particularly, the upper case and the lower case are combined in a sliding structure, so that the battery pack case is easily combined, and a high strength material is used for the lower case. The present invention relates to a battery pack case, a pouch type lithium secondary battery, and a method of manufacturing the same, which have improved stability.

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

In view of economical aspects, the battery pack employs a secondary battery capable of charging and discharging. Representative secondary batteries include lithium secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.

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

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

Typically, the pouch-type lithium secondary battery of the lithium secondary battery is a pouch packaging material is usually composed of a multilayer layer of a metal foil layer and a synthetic resin layer covering the same, when using this than the cylindrical or square lithium secondary battery using a metal can Since the weight can be remarkably reduced, the weight reduction of the lithium secondary battery has been developed toward the pouch type lithium secondary battery.

In general, the pouch-type lithium secondary battery accommodates the electrode assembly on the bottom surface of the pouch case having a space for accommodating the electrode assembly, covers the bottom surface by using the top surface of the pouch case, and seals the pouch bare cell. A bare cell is formed, and an accessory such as a protection circuit module is attached to the pouch bare cell to form a pouch core pack.

Then, the pouch core pack is accommodated in a battery pack case including an upper case and a lower case, the upper case and the lower case are combined, and the upper case and the lower case are joined by ultrasonic welding to form a pouch-type lithium secondary. Form a battery. At this time, the upper case and the lower case is generally made of a resin such as plastic. In addition, the upper case has a space for accommodating the pouch core pack, the lower case covers the upper case, and corresponds to the electrical / electronic device.

However, the pouch type lithium secondary battery including the battery pack case as described above has a problem in that the process is complicated by bonding the upper case and the lower case through ultrasonic welding.

In addition, the lower case corresponding to the electrical / electronic device is generally formed much thinner than the upper case there is a problem that is vulnerable to the external environment. In particular, there is a risk of rupture of the pouch-type lithium secondary battery because it is very vulnerable to the poke of a pointed object, such that the safety of the pouch-type lithium secondary battery is weak.

An object of the present invention is to solve the above-described problems of the prior art, the present invention is coupled to the upper case and the lower case in a sliding structure is easy to combine the battery pack case, the high strength material can be used for the lower case stability An object of the present invention is to provide an improved battery pack case, a pouch type lithium secondary battery, and a method of manufacturing the same.

The battery pack case of the present invention for achieving the above object and the upper case having a space for accommodating the pouch core pack; A lower case covering the upper case; It is made of a structure having a sliding coupling means formed in the upper case and the lower case.

In addition, the pouch type lithium secondary battery of the present invention includes a pouch core pack having a protection circuit module attached to the pouch bare cell; The battery pack case includes a battery pack case accommodating the pouch core pack and having an upper case and an outer case coupled through sliding coupling means.

In the embodiment of the present invention, the sliding engagement means is composed of a guide protrusion and a guide groove. At this time, preferably, any one of the upper case and the lower case has a guide protrusion, and the other of the upper case and the lower case has a guide groove.

The upper case and the lower case separation prevention means may be further provided.

The upper case and the lower case may be made of different materials, wherein the lower case is preferably made of high strength steel or high strength composite material.

In addition, the present invention comprises the steps of forming a pouch core pack; Accommodating the pouch core pack in an upper case having a space for accommodating the pouch core pack, the upper case having any one of a sliding coupling means comprising a guide protrusion and a guide groove; It includes a method of manufacturing a pouch-type lithium secondary battery comprising the step of covering the upper case using a lower case having another one of the sliding coupling means consisting of the guide protrusion and the guide groove.

The method may further include ultrasonically welding the upper case and the lower case.

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

Figure 1a is a perspective view showing a state before the pouch packaging material of the pouch-type lithium secondary battery according to an embodiment of the present invention, Figure 1b is a protective circuit module of the pouch-type lithium secondary battery according to an embodiment of the present invention is attached After that, it is a perspective view showing a state before assembling the battery pack case.

1A and 1B, a pouch-type lithium secondary battery according to an exemplary embodiment of the present invention includes an electrode assembly 110 that generates a voltage difference when charging and discharging, and a pouch packaging material accommodating the electrode assembly 110. 120, a protection circuit module 130 for controlling charging and discharging of the electrode assembly 110, and a battery pack case 140 for allowing the pouch-type lithium secondary battery to be coupled to an electric / electronic device. Made of structure.

The pouch-type lithium secondary battery as described above is manufactured through the following process.

First, the electrode assembly 110 is prepared.

In this case, the electrode assembly 110 is any one of a positive electrode active material and a negative electrode active material, for example, the first electrode plate 111 coated with a positive electrode active material, and the other one of the positive electrode active material and the negative active material, for example, The first electrode plate 111 and the second electrode plate 112 are disposed between the second electrode plate 112 coated with the negative electrode active material, and the first electrode plate 111 and the second electrode plate 112. The separator 113 is formed in a wound form to prevent shorts and to allow only movement of lithium ions. In addition, the first electrode plate 111 is generally made of aluminum (Al) material, and a first electrode tab 114 is formed to protrude a predetermined length to the upper side and serve as a positive electrode tab. The second electrode plate 112 is generally made of a nickel (Ni) material, but a second electrode tab 115 is formed to protrude a lower length to serve as a negative electrode tab. It is not limited. In addition, an insulating tape 116 may be further provided to prevent a short circuit between the first electrode tab 114 and the second electrode tab 115 and the pouch case 120.

In this case, a chalcogenide compound is used as the cathode active material, and complex metal oxides such as LiCoO 2, LiMn 2 O 4, LiNiO 2, LiNi 1-x Cox O 2 (0 <x <1), and LiMnO 2 are used. As the negative electrode active material, carbon (C) -based materials, Si, Sn, tin oxides, composite tin alloys, transition metal oxides, lithium metal nitrides, or lithium metal oxides are used. Also, in general, the anode electrode plate is made of aluminum (Al), the cathode electrode plate is made of copper (Cu), and the separator is generally made of polyethylene (PE) or polypropylene (PP). It does not limit the above materials.

Then, prepare the pouch packaging 120. In this case, the pouch packaging material 120 includes a space 121a in which the electrode assembly 110 is accommodated, a bottom surface 121 having a flange 121b at an edge of the space 121a, and the space 121a is formed. The upper surface 122 covers the lower surface 121. In addition, the space 121a for accommodating the electrode assembly 110 is formed through a press process or the like.

On the other hand, the order of preparing the electrode assembly 110 and the pouch packaging material 120 is not necessarily limited thereto, and after preparing the pouch packaging material 120, the electrode assembly 110 may be prepared.

After preparing the pouch packaging material 120, the electrode assembly 110 is accommodated in a space 121a for accommodating the electrode assembly 110 of the bottom surface 121 of the pouch packaging material 120. In this case, the electrode assembly 110 is seated in the space 121a of the bottom surface 121 of the pouch packaging material 120, and the first electrode tab 114 and the second electrode of the electrode assembly 110 are mounted in this state. A portion of the tab 115 protrudes out of the pouch sheath 120.

After accommodating the electrode assembly 110 in the space 121a of the pouch packaging material 120, the upper surface 122 is folded to abut the edge of the lower surface 121 and the space 121a, and the lower surface 121 is closed. And the upper surface 122 is bonded to seal to form a pouch bare cell (bare cell). At this time, the portion where the lower surface 121 and the upper surface 122 abut and are joined and sealed serves as the bonding portion 123.

After sealing the pouch sheath 120, the protective circuit module 130 is electrically connected to the first electrode tab 114 and the second electrode tab 115 of the electrode assembly 110 to form a pouch core pack. form a core pack.

In this case, the protection circuit module 130 is electrically connected to the first electrode tab 114 and the second electrode tab 115 of the electrode assembly 110 to charge, discharge, and malfunction of the electrode assembly 110. For controlling, for example, when overcurrent flows from the electrode assembly 110, it serves to block the overcurrent. In addition, although not shown in the drawings, the protection circuit module 130 is generally made of a structure having various protection circuits.

After the pouch core pack is formed, the pouch core pack is accommodated in the battery pack cases 141 and 145 to form a pouch-type lithium secondary battery.

In this case, the battery pack cases 141 and 145 serve to couple the pouch-type lithium secondary battery to an electric / electronic device. In addition, the battery pack cases 141 and 145 include an upper case 141 and a lower case 145, and the upper case 141 and the lower case 145 are provided through sliding coupling means 147a and 147b. Combined. In addition, the upper case 141 has a space for accommodating the pouch core pack. In addition, the lower case 145 covers the upper case 141 and has a window 145a corresponding to the electric / electronic device and allowing the protection circuit board 130 to be connected to an external terminal. do.

On the other hand, Figure 2a is a perspective view for explaining the upper case of the battery pack case of the pouch-type lithium secondary battery according to an embodiment of the present invention, Figure 2b is a battery pack case of a pouch-type lithium secondary battery according to an embodiment of the present invention Is a perspective view for explaining the lower case.

2A and 2B, a battery pack case of a pouch-type lithium secondary battery according to an exemplary embodiment of the present invention includes an upper case 141 and a lower case 145, and the upper case 141 and the lower case. 145 is coupled via sliding engagement means 147a and 147b.

In this case, the sliding coupling means (147a, 147b) is any one of the upper case 141 and the lower case 145, for example, the upper case 141 is provided with a guide groove 147a, the upper case The other one of the 141 and the lower case 145, for example, the lower case 145 includes a guide protrusion 147b so that the upper case 141 and the lower case 145 slide as if they slide together. To be coupled through.

More specifically, after the pouch core pack is attached to the upper case 141 having a space for accommodating the pouch core pack through an adhesive such as double-sided tape, the lower case 145 is used to attach the pouch core pack. The upper case 141 is covered to form a pouch-type lithium secondary battery.

In addition, although not shown in the drawings, after the upper case 141 and the lower case 145 are coupled through the sliding coupling means 147a and 147b, the upper case 141 and the lower case 145 are separated. It is preferable to further provide a separation preventing means for preventing the.

In addition, after the upper case 141 and the lower case 145 are coupled through the sliding coupling means 147a and 147b, ultrasonic welding may be further performed. This is to strengthen the coupling force between the upper case 141 and the lower case 145.

As described above, when the battery pack case is formed of the upper case 141 and the lower case 145 coupled through the sliding coupling means 147a and 147b, the upper case 141 and the lower case ( 145 can also be formed of different materials. This is because the upper case 141 and the lower case 145 may be coupled through the sliding coupling means 147a and 147b without a separate bonding process.

In addition, as described above, when using the upper case 141 and the lower case 145 as a heterogeneous material, by using a high-strength material for the lower case 145, the external environment of the lower case 145, In particular, the resistance to sticking by a sharp object or the like can be improved. At this time, the high-strength material used in the lower case 145 may be made of high-strength steel, high-strength composite materials and their equivalents, but is not limited thereto.

Therefore, the pouch-type lithium secondary battery as described above combines the upper case 141 and the lower case 145 through the sliding coupling means (147a, 147b), it is possible to simplify the manufacture of the pouch-type lithium secondary battery have.

In addition, by using a high-strength material as the lower case 145, the lower case 145 is improved in resistance to the sting of the external environment, in particular, a sharp object, etc., thereby improving the safety of the pouch-type lithium secondary battery.

As described above, according to the present invention, the upper case and the lower case are coupled in a sliding structure, so that the battery pack case can be easily coupled, and a high strength material can be used for the lower case, thereby improving stability of the battery pack case and pouch type lithium. A secondary battery and a manufacturing method thereof can be provided.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (12)

An upper case having a space for receiving the pouch core pack; A lower case covering the upper case; And a sliding coupling means formed on the upper case and the lower case. The method of claim 1, The sliding coupling means is a battery pack case, characterized in that consisting of a guide protrusion and a guide groove. The method of claim 2, Any one of the upper case and the lower case has a guide protrusion, The battery pack case, characterized in that the other of the upper case and the lower case has a guide groove. The method of claim 1, And a top case and a bottom case separation preventing means. The method of claim 1, The upper case and the lower case is a battery pack case, characterized in that made of different materials. The method of claim 5, The lower case is a battery pack case, characterized in that made of high strength steel or high strength composite material. A pouch core pack having a protection circuit module attached to the pouch bare cell; A pouch type lithium secondary battery comprising the battery pack case accommodating the pouch core pack and having an upper case and an outer case coupled through sliding coupling means. The method of claim 7, wherein The sliding coupling means is made of a guide protrusion and a guide groove, One of the upper case and the lower case has a guide protrusion, and the other of the upper case and the lower case has a pouch-type lithium secondary battery, characterized in that provided with a guide groove. The method of claim 7, wherein Pouch-type lithium secondary battery further comprises the upper case and the lower case separation preventing means. The method of claim 7, wherein The lower case is a pouch type lithium secondary battery, characterized in that made of high strength steel or high strength composite material. Forming a pouch core pack; Accommodating the pouch core pack in an upper case having a space for accommodating the pouch core pack, the upper case having any one of a sliding coupling means comprising a guide protrusion and a guide groove; And covering the upper case by using a lower case provided with the other one of the sliding coupling means formed of the guide protrusion and the guide groove. The method of claim 11, The method of manufacturing a pouch type lithium secondary battery further comprises the step of ultrasonic welding the upper case and the lower case.

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