KR20050043022A - Pcm and pcm moulding method of lithium ion polymer battery - Google Patents

Abstract

In order to protect the Li-ion polymer battery from overcharging, the package-molding of the protection circuit module (PCM) connected to the battery is performed by a separate process on the battery cell and then spot welding on the battery cell. By fixing, mass production of the protection circuit module reduces the cost, the contact rate of the terminal is improved, the reliability of the product is secured, and the internal characteristics of the battery cell are deteriorated due to the temperature generated during the molding of the protection circuit module. In order to prevent things,

The present invention is a cathode plate assembly consisting of a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, an insulating case for receiving the electrode plate assembly in a sealed state, a positive electrode terminal connected to the tabs of the positive electrode plate and the negative electrode plate exposed to the outside of the insulating case and In a lithium ion polymer battery comprising a negative electrode terminal,

A first step of patterning a protective circuit module connected to the aforementioned polymer battery so as to protect the polymer battery from overcharging, a second step of seating the patterned protective circuit module in a mounting groove of a mold, and a resin; The third step of molding the package molding by injecting the molten resin supplied from the supply unit under the conditions set in the protection circuit module through the nozzle, and the +,-terminals exposed from the package molding protection circuit module are positive And a fourth step of welding and fixing the terminal and the negative electrode terminal.

Description

PCM and PCM molding method of lithium ion polymer battery}

The present invention provides a battery cell after package molding a patterned protection circuit module (PCM) connected to a battery to protect a lithium ion polymer battery from overcharging. The present invention relates to a PCM for a lithium ion polymer battery, and a molding method thereof, which is fixed by spot welding.

More specifically, after separately forming the protective circuit module and the battery cell, the soldering and fixing the terminal of the protective circuit module to the battery cell to mass-produce the molded protective circuit module to reduce the cost cost, The present invention relates to a PCM for a lithium ion polymer battery and a method of forming the same, which secures reliability by improving a contact ratio and prevents a protection circuit module from deteriorating internal characteristics of a battery cell due to temperature generated during molding of a package.

In general, a lithium ion or lithium polymer secondary battery is a battery manufactured by forming a separator, an electrolyte, and an electrolyte that provides a movement path of lithium ions between a cathode, an anode, and a cathode and an anode, and lithium ions are inserted / removed at the cathode and the anode. Electrical energy is produced by oxidation and reduction reactions when inserted.

A lithium secondary battery is classified into a lithium ion battery using a liquid electrolyte and a lithium ion polymer battery using a solid electrolyte according to the type of separator.

The above-mentioned lithium ion battery uses polyethylene, polypropylene, or a laminated structure thereof, which can hardly absorb the electrolyte as a separator.

On the other hand, the lithium ion polymer battery uses an electrolyte made of a polymer such as polyvinylidene fluoride, polyacrylonitrile, polyacrylate, polyethylene oxide, etc. which can impregnate the electrolyte solution as a separator.

Among them, the lithium ion polymer battery uses a solid electrolyte, so there is little risk of leakage of the electrolyte solution, and it is easy to manufacture as a battery pack because of excellent processability, and has a small volume, light weight, and low self discharge rate. Since it has, it is excellent in safety compared to the lithium ion battery, it is easy to manufacture a square and large batteries.

Lithium-ion batteries have a higher energy density and higher operating voltage than conventional batteries, and during discharge, lithium ions of the (+) electrode enter the carbon grid of the (-) pole via an intermediate material. Almost no has the advantage of excellent preservation and life characteristics.

For this reason, it is widely used as a battery of electronic products, such as mobile terminals, such as a personal computer (PC), a notebook computer, a camcorder, a portable telephone, and a portable CD player.

On the other hand, a lithium ion battery has a disadvantage in that flammable materials (Li-CIC, electrolyte, etc.) are installed inside the case, and thus, stability such as heat generation and explosion when the battery is overcharged at 4.2V or more.

As a result, the overcharge protection circuit PCM is connected and used so that charging is performed at a stable level with respect to the cells inside the packaged case of the battery.

In other words, the above-described protection circuit mainly comprises a field effect transistor (FET) as a switching element that controls current in abnormal external situations such as overcharge, and consists of passive elements such as a voltage detector, a resistor, and a capacitor. do.

The above protection circuit prevents the battery from being overcharged, overdischarged, overcurrent, short-circuited, reverse voltage, etc. to prevent the battery from exploding, overheating or leaking, and deteriorating the charge / discharge characteristics, thereby eliminating the risks to the user. .

In addition, it is possible to extend the service life of the battery by suppressing the degradation of the electrical performance of the battery and the physical / chemical abnormal behavior.

As schematically shown in FIG. 1, the structure of a typical lithium ion polymer battery is that a lithium ion polymer battery is interposed between a positive electrode plate and a negative electrode plate in which an electrode active material is filled in a grid, and is interposed between these positive electrode plates and the negative electrode plate. A pole plate assembly 1 (refering to a battery cell) having a structure in which a separator in which an electrolyte solution is impregnated is stacked is provided.

At this time, the positive electrode tab (2) is formed on one side of the above-described positive electrode plate and the negative electrode tab (3) is formed on one side of the negative electrode plate, these positive electrode tab (2) and the negative electrode tab (3) to maintain a constant interval in parallel The positive electrode tab 2 and the negative electrode tab 3 are connected to an external circuit as they are electrically connected to the leads 4 and 5.

The above-described pole plate assembly 1, the positive electrode tab 2, the negative electrode tab 3, the positive electrode lead 4 and the negative electrode lead 5 are embedded in the insulating case 6 and sealed by the cover 7.

The insulating case 6 and the cover 7 are typically stacked on top and bottom surfaces of an aluminum thin film, and are sealed to the space in which the electrode plate assembly 1 is accommodated as the heat adhesive materials are bonded to each other. It becomes possible.

In addition, the electrode plate assembly 1 is sealed by the insulating case 6 in a state where a part of the positive electrode lead 4 and the negative electrode lead 5 are exposed to the outside for electrical connection with the outside.

As shown in FIG. 2, the PMM for a lithium ion battery according to the related art adds SMD type components such as a protection circuit module to the printed circuit board 10 of the battery 8 embedded in the battery case 9. After manufacturing separately so that it can be mounted by using a mold, the terminal block 11 (contact block), which is separately manufactured by a mold, is soldered and fixed to the printed circuit board 10, and the + and-nickel battery plates of the battery 8 are output terminals. The protection circuit module and the battery 8 are electrically connected to each other by soldering them to (12) and incorporating and fixing them in the battery case 9.

In the above-described PCM structure for a lithium ion battery, a separate printed circuit board 10 on which components such as a protective circuit module is mounted is manufactured, and then connected to a separate terminal block 11 by soldering fixing. Productivity and workability are reduced due to the increase in the number of workmen to manufacture the cost has a problem that the price competitiveness is lowered due to the increase in cost.

In addition, since the above-described terminal block 11 is manufactured by a separate mold and then embedded in the battery case 9, the manufacturing cost of manufacturing the mold increases.

Accordingly, an object of the present invention is to package molded a patterned protective circuit module (PCM) used to protect a lithium ion polymer battery from overcharging and then connect the polymer cell with welding fixation to the terminals of the battery cell. As a result, the present invention provides a PCM for a lithium ion polymer battery and a method of forming the same, which can significantly reduce cost by mass-producing a molded protective circuit module.

Another object of the present invention, by separately forming the protective circuit module and the battery cell, and by welding and electrically connecting them, the contact of the connection terminal is improved to improve the reliability of the product, the package molding molding of the protective circuit module It is to provide a PCM and a molding method for a lithium-ion polymer battery that can improve the quality by preventing the internal characteristics of the battery cell is lowered due to the temperature generated during.

The object of the present invention described above is a positive electrode assembly comprising a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, an insulating case for receiving the electrode plate assembly in a sealed state, connected to the tabs of the positive electrode plate and the negative plate to the outside of the insulating case In a lithium ion polymer battery comprising an exposed positive terminal and a negative terminal,

A first step of patterning a protective circuit module connected to the aforementioned polymer battery and used to protect the polymer battery from overcharging;

A second step of seating the patterned protection circuit module in the mounting groove of the mold;

A third step of molding the package by injecting the molten resin supplied from the resin supply unit under a condition set in the protection circuit module through a nozzle;

To provide a PSI molding method for a lithium-ion polymer battery comprising a fourth step of welding and fixing the +,-terminal exposed from the package-molded protective circuit module to the positive terminal and the negative terminal of the polymer battery. Is achieved.

The object of the present invention described above is a positive electrode assembly comprising a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, an insulating case for receiving the electrode plate assembly in a sealed state, connected to the tabs of the positive electrode plate and the negative plate to the outside of the insulating case In a lithium ion polymer battery comprising an exposed positive terminal and a negative terminal,

Patterning and molding the protective circuit module used to protect the polymer battery from overcharging, wherein the + and-terminals of the package molded protective circuit module are welded and fixed to the positive terminal and the negative terminal of the polymer battery. It is achieved by providing a PC for a lithium ion polymer battery, characterized in that.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which are intended to describe in detail enough to be easily carried out by those skilled in the art to which the present invention pertains. This does not mean that the technical spirit and scope of the present invention is limited.

As shown in FIGS. 3 to 5, the present invention provides a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, an insulating case for receiving the electrode plate assembly in a sealed state, and a tab of the positive electrode plate and the negative plate. Applied to a lithium ion polymer battery comprising a positive terminal and a negative terminal connected to the outside of the insulating case,

Since these belong to the technical content used in the technical field to which this application belongs, it turns out that detailed description is abbreviate | omitted.

As shown in FIG. 3, the PCM molding method for a lithium ion polymer battery according to the present invention is connected to the aforementioned lithium ion polymer battery 100 to be used to protect the polymer battery 100 from overcharging. A first step S 100 of patterning the circuit module 101 (PCM), a second step S 200 of mounting the patterned protection circuit module 101 in a seating groove (not shown) of the mold; ,

In addition, a third step (S 300) of molding the package by molding the molten resin supplied from the resin supply unit through a nozzle (not shown) under the condition set in the protection circuit module 101, and the package molding protection. A fourth step S 400 for spot welding the + and-terminals 104 and 105 exposed from the circuit module 101 to the positive terminal 106 and the negative terminal 107 of the polymer battery 100 is performed. Include.

As shown in Figure 4 and 5, the PCM for lithium-ion polymer battery according to the present invention, the protection circuit module 101 (PCM) used to protect the above-described polymer battery 100 from overcharge The patterned molding may be performed, but the + and − terminals 104 and 105 of the package molded protective circuit module 101 are welded to the positive terminal 106 and the negative terminal 107 of the polymer cell 100.

110 in the figure is a printed circuit board in the protection circuit module 101.

Hereinafter, a use example of the PCM molding method for a lithium ion polymer battery according to the present invention will be described in more detail with reference to the accompanying drawings.

3 to 5, the protection circuit module 101 used to be connected to the aforementioned lithium ion polymer battery 100 to protect the polymer battery 100 from overcharging is patterned (S). 100).

The patterned protective circuit module 101 is seated in the mounting groove of the mold (see S 200).

The molten resin supplied from the resin supply unit is sprayed under the condition set in the protection circuit module 101 through the nozzle to mold the package (see S 300).

At this time, package molding molding by supplying the molten resin supplied from the resin supply unit through the nozzle to the protection circuit module 101 seated on the mold under a predetermined pressure, time and temperature conditions is used in the art. The detailed description thereof will be omitted.

The + and-terminals 104 and 105 exposed from the package molded protective circuit module 101 are welded to the positive terminal 106 and the negative terminal 107 of the polymer battery 100 (see S 400).

As described above, after molding and molding a protection circuit module (PCM) used to protect the lithium ion polymer battery from overcharging, the terminal of the protection circuit module is welded and fixed to the terminals of the polymer battery. In addition, packaging molding of the protection circuit module reduces the cost of mass production, and improves the reliability of the product by improving the contact ratio of the protection circuit module to the polymer battery.

As described above, the PCM for a lithium ion polymer battery and the molding method thereof according to the present invention have the following advantages.

The patterned protective circuit module (PCM), which is used to protect lithium ion polymer cells from overcharging, is molded and connected to the battery cell terminals by welding, thereby forming a large number of molded protective circuit modules. The production cost has been greatly reduced to be competitive.

In addition, since the protective circuit module and the battery cell are separately molded and welded to each other, and the terminals are electrically connected to each other, the contactability of the connection terminals is improved, thereby increasing the reliability of the product. It is possible to improve the quality by preventing the internal characteristics of the battery cell is lowered due to the generated temperature.

1 is a schematic enlarged view of a main portion of a typical lithium ion polymer battery,

2 is a schematic use state diagram of a PC for a lithium ion battery according to the prior art,

3 is a flowchart showing a PCM molding method for a lithium ion polymer battery according to the present invention;

4 is a schematic view of molding after molding a PCM for a lithium ion polymer battery according to the present invention;

Figure 5 is a schematic diagram of a welding state fixed to the battery after molding a polymer for a lithium-ion polymer battery according to the present invention.

* Explanation of symbols used in the main part of the drawing

100; Polymer battery

101; Protective circuit module

104,105; Terminals

106; Positive terminal

107; Negative terminal

110; Printed circuit board

Claims (2)

A positive electrode plate comprising a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, an insulating case for receiving the electrode plate assembly in a sealed state, and a positive electrode terminal connected to the tabs of the positive electrode plate and the negative electrode plate and exposed to the outside of the insulating case. And a cathode terminal, wherein the PSI molding method for a lithium ion polymer battery comprises: Patterning a protective circuit module connected to the polymer battery and used to protect the polymer battery from overcharging; A second step of seating the patterned protection circuit module in a mounting groove of a mold; A third step of molding a package by injecting molten resin supplied from a resin supply unit through a nozzle under a condition set in the protection circuit module; And And a fourth step of welding and fixing the + and-terminals exposed from the package-molded protective circuit module to the positive terminal and the negative terminal of the polymer battery. A positive electrode plate comprising a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate, an insulating case for receiving the electrode plate assembly in a sealed state, and a positive electrode terminal connected to the tabs of the positive electrode plate and the negative electrode plate and exposed to the outside of the insulating case. And a negative electrode terminal, the lithium ion polymer battery comprising: Patterning and molding the protective circuit module used to protect the polymer battery from overcharging, wherein the +,-terminals of the package molded molded protective circuit module is welded and fixed to the positive terminal and the negative terminal of the polymer battery A PC for a lithium ion polymer battery, characterized in that.