KR101949522B1 - Battery pack and method of fabricating the same - Google Patents

Abstract

The present invention provides a method of manufacturing a battery cell, comprising: preparing a battery cell having a pair of electrode tabs protruding thereon including a positive electrode tab and a negative electrode tab; An external connection terminal capable of directly contacting with a connector pin on the set main board, first and second internal connection terminals respectively connectable to the positive electrode tab and the negative electrode tab, a battery protection circuit component, Preparing a battery protection circuit package including a sealing member which seals and exposes the external connection terminal and the internal connection terminal; The first internal connection terminal is disposed so as to be in face-to-face contact with the lower surface of the positive electrode tab and the second internal connection terminal is disposed in face-to-face contact with the lower surface of the negative electrode tab, Folding on one side of the first internal connection terminal about the axis and placing the other side of the first internal connection terminal in a face-to-face contact with the upper surface of the positive electrode tab; And joining the first internal connection terminal and the positive electrode tab in a spot welding process and joining the second internal connection terminal and the negative electrode tab in a spot welding process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack and a method of manufacturing the same. More particularly, the present invention relates to a battery pack and a method of manufacturing the battery pack.

Generally, battery packs are used in mobile terminals such as mobile phones and PDAs. Lithium-ion battery packs are the most widely used batteries in portable terminals, and generate heat when overcharged or overcurrented. When the temperature rises due to heat generation, the battery deteriorates as well as the risk of explosion. Therefore, in a conventional battery pack, a protection circuit module for detecting overcharge, over-discharge, and over-current is mounted, or a protection circuit for detecting overcharge, over-discharge, do. In recent years, miniaturization and stability of the battery pack have emerged as important technical issues.

Prior art relating to the present invention is Korean Patent Laid-Open Publication No. 10-2009-0117315 (published on Nov. 12, 2009, entitled Battery Pack).

An object of the present invention is to provide a battery pack and a manufacturing method thereof that are advantageous in terms of integration, miniaturization, and stability. However, these problems are exemplary and do not limit the scope of the present invention.

A battery pack according to an aspect of the present invention is provided. The battery pack includes a battery cell and a battery protection circuit package. In the battery cell, a pair of electrode tabs including a positive electrode tab and a negative electrode tab are protruded. The battery protection lead package includes a connector pin A pair of internal connection terminals connected to the pair of electrode tabs, a battery protection circuit component, a battery protection circuit component, and the external connection terminal and the internal connection terminal are exposed .

In the battery pack, the pair of internal connection terminals include a first internal connection terminal and a second internal connection terminal disposed on both sides of the sealing material, the first internal connection terminal being folded, And the second internal connection terminal may be bonded to one of the upper and lower surfaces of the negative electrode tab.

In the battery pack, the positive electrode tab may include aluminum, the negative electrode tab may include nickel, and the pair of internal connection terminals may include nickel.

In the battery pack, the first internal connection terminal is folded on one side of the first internal connection terminal with respect to the folding axis, one side of the first internal connection terminal is connected to the lower surface of the positive electrode tab, The other side of the first internal connection terminal is connected to the upper surface of the positive electrode tab, and the second internal connection terminal is connected to the lower surface of the negative electrode tab.

In the battery pack, the electrode tab protruding from the battery cell is not folded, and the main surface of the external connection terminal and the main surface of the battery cell are parallel to each other, can do.

A method of manufacturing a battery pack according to another aspect of the present invention is provided. The method includes the steps of: preparing a battery cell having a pair of electrode tabs protruding thereon including a positive electrode tab and a negative electrode tab; An external connection terminal capable of directly contacting with a connector pin on the set main board, first and second internal connection terminals respectively connectable to the positive electrode tab and the negative electrode tab, a battery protection circuit component, Preparing a battery protection circuit package including a sealing member which seals and exposes the external connection terminal and the internal connection terminal; The first internal connection terminal is disposed so as to be in face-to-face contact with the lower surface of the positive electrode tab and the second internal connection terminal is disposed in face-to-face contact with the lower surface of the negative electrode tab, Folding on one side of the first internal connection terminal about the axis and placing the other side of the first internal connection terminal in a face-to-face contact with the upper surface of the positive electrode tab; And joining the first internal connection terminal and the positive electrode tab in a spot welding process and bonding the second internal connection terminal and the negative electrode tab in a spot welding process.

According to some embodiments of the present invention as described above, it is possible to provide a battery pack and a manufacturing method thereof that are advantageous for integration, miniaturization, and stability. Of course, the scope of the present invention is not limited by these effects.

1 is an exploded perspective view illustrating a process of manufacturing a battery pack according to an embodiment of the present invention.
2A to 2C are views of a battery pack according to an embodiment of the present invention.
FIGS. 3A through 3C illustrate a configuration of a battery protection circuit package in a first step of a method of manufacturing a battery pack according to an embodiment of the present invention.
FIGS. 4A to 4C are views illustrating a configuration of a battery protection circuit package in a second step of a method of manufacturing a battery pack according to an embodiment of the present invention.
5A to 5C are views illustrating the configuration of a battery protection circuit package in a third step of a method of manufacturing a battery pack according to an embodiment of the present invention.

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

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It is to be understood that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term " and / or " includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, in the figures the elements are turned over so that the elements depicted as being on the top surface of the other elements are oriented on the bottom surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise " and / or " comprising " when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is an exploded perspective view illustrating a part of a process of manufacturing a battery pack according to an embodiment of the present invention, and FIGS. 2A to 2C are views of a battery pack according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a battery pack 800 according to an embodiment of the present invention includes a battery cell 700 and a battery protection circuit package 300.

The battery cell 700 includes a pair of electrode tabs 720 including a positive electrode tab and a negative electrode tab 720b. The battery cell 700 is, for example, a battery cell used as a secondary battery, and may be a lithium polymer battery cell that has been popular in recent years. The lithium polymer battery is manufactured in a pouch type having flexibility and its shape is relatively free. In addition, the lithium polymer battery is excellent in safety and light in weight, which is advantageous for slimmer and lighter portable electronic devices. The battery cell 700 of the secondary battery may include a battery case and a case for providing a space for accommodating the battery cell. The battery unit is also called a jelly roll because it has the same shape as a jelly. For example, the jelly roll may be formed by stacking a plurality of electrode plates, and the electrode plate may be alternately stacked with the positive electrode plate and the negative electrode plate. Further, a separator may be inserted between the positive electrode plate and the negative electrode plate. A pair of electrode tabs 720 made of a positive electrode tab 720a and a negative electrode tab 720b protrude from one side of the battery unit 700 and are electrically connected to the electrode plate have. A pair of electrode tabs 720 composed of the positive electrode tab 720a and the negative electrode tab 720b can be realized by a tap cutting process. The protection member 710 may be configured to protect a portion where the electrode tabs 720 are connected to the electrode tabs with mechanical strength.

The battery protection circuit package 300 includes external connection terminals P +, P-, and B- capable of making direct contact with a connector pin (not shown) on a set main board, a pair of electrode tabs 720, (P +, P-, B-) and a pair of internal connection terminals (51, 52) connected to the battery protection circuit component And an encapsulating material 250 for exposing the internal connection terminals 51 and 52.

The battery protection circuit component may include, for example, a dual field effect transistor, a protection IC, a resistor, a varistor, a capacitor and / or a PTC device mounted on a substrate. The substrate may include a lead frame and / or a printed circuit board. When the substrate is a lead frame, the external connection terminals P +, P-, and B- and the pair of internal connection terminals 51 and 52 may constitute a part of one lead frame.

The pair of inner connection terminals 51 and 52 includes a first inner connection terminal 51 and a second inner connection terminal 52 disposed on both sides of the sealing material 250. The first internal connection terminal 51 may be folded and bonded to the upper and lower surfaces of the positive electrode tab 720a and the second internal connection terminal 52 may be bonded to one of the upper and lower surfaces of the negative electrode tab 720b.

For example, when the battery cell 700 is a polymer cell, the pair of internal connection terminals 51 and 52 include nickel, the positive electrode tab 720a contains aluminum, and the negative electrode tab 720b The electrode tabs 720 and the internal connection terminals 51 and 52 may be made of nickel so that when the resistance welding process (or spot welding process) is performed between the electrode tabs 720 and the internal connection terminals 51 and 52, The internal connection terminal 51 that is connected to the positive electrode tab 720a may be folded so that both surfaces of the positive electrode tab 720a may be used as the bonding surfaces.

In the battery pack 800, the first internal connection terminal 51 is folded on one side 51a of the first internal connection terminal with the other side 51b of the first internal connection terminal about the folding axis, One side 51a of the first internal connection terminal is connected to the lower surface of the positive electrode tab 720a and the other side 51b of the first internal connection terminal is connected to the upper surface of the positive electrode tab 720a, May be joined to the lower surface of the negative electrode tab 720b. The pair of electrode tabs 720 shown in FIG. 1 are top surfaces of the upper and lower surfaces.

In the battery pack 800, the electrode tab 720 protruding from the battery cell 700 is not additionally folded in a protruded state, and the main surface of the external connection terminals P +, P-, and B- The main surface of the cell 700 is aligned. According to this configuration, the main surfaces of the external connection terminals P +, P-, B- and the main surface of the set main board can be juxtaposed.

Since the electrode tabs 720 protruding from the battery cells 700 are not folded in a protruded state, a battery pack advantageous in integration, miniaturization, and stability can be realized.

In addition, since the connector pin (not shown) on the set main board and the external connection terminals P +, P-, B- can be in direct contact with each other, The configuration of the flexible circuit board and the connector is not required for the electrical connection between the main boards, which is advantageous for the integration and miniaturization of the electronic apparatus having the battery pack.

Hereinafter, a method of manufacturing the battery pack 800 according to an embodiment of the present invention will be described in detail.

The manufacturing method may include: i) preparing a battery cell 700 protruding a pair of electrode tabs 720 including a positive electrode tab 720a and a negative electrode tab 720b; ii) first and second internal connection terminals 52 which can be connected to the positive electrode tab 720a and the negative electrode tab 720b, respectively, an external connection terminal capable of directly contacting the connector pin on the set main board, Preparing a battery protection circuit package (300) having a circuit component, a sealing member (250) sealing the battery protection circuit component and exposing the external connection terminal and the internal connection terminal; iii) One side 51a of the first internal connection terminal is disposed in face-to-face contact with the lower surface of the positive electrode tab 720a, and the second internal connection terminal 52 is brought into face-to- (51b) of the first internal connection terminal is folded on one side (51a) of the first internal connection terminal around the folding axis so that the other side (51b) of the first internal connection terminal is connected to the positive terminal In a face-to-face contact with the upper surface of the first substrate (720a); And iv) joining the first internal connection terminal 51 and the positive electrode tab 720a by a spot welding process and bonding the second internal connection terminal 52 and the negative electrode tab 720b by a spot welding process And a bonding step.

FIGS. 3A, 3B, and 3C are a perspective view, a front view, and a rear view, respectively, illustrating the configuration of the battery protection circuit package in the ii) preparation of the battery protection circuit package. In this state of the battery protection circuit package, the lower surface of one side 51a of the first internal connection terminal is disposed in face-to-face contact with the lower surface of the positive electrode tab 720a, In a face-to-face contact with the lower surface of the negative electrode tab 720b.

3A, an upper surface of the first internal connection terminal 51 and an upper surface of the second internal connection terminal 52 are shown. A slit constituting a folding axis 51c may be formed between one side 51a of the first internal connection terminal and the other side 51b of the first internal connection terminal.

Referring to FIG. 3B, in order to adjust the height of the pair of internal connection terminals 51 and 52, a region directly protruding from the sealing member 250 may be bent. According to the technical idea of the present invention, since the connector pin (not shown) on the set main board and the external connection terminals P +, P-, B- can be in direct contact with each other, Elevation control can have meaning.

3C, external connection terminals P +, P-, and B- exposed by the encapsulant 250 are shown and the lower surface of the first internal connection terminal 51 and the lower surface of the second internal connection terminal 52 Is shown.

FIGS. 4A, 4B and 4C are cross-sectional views illustrating a method of folding the battery pack in an intermediate process of folding the other side 51b of the first internal connection terminal on one side 51a of the first internal connection terminal, A front view, and a rear view, respectively, illustrating a configuration of a circuit package. The configuration of the battery protection circuit package 300 shown in these drawings corresponds to the configuration of the battery protection circuit package 300 shown in Fig.

FIGS. 5A, 5B and 5C are a perspective view, a front view, and a rear view, respectively, illustrating the structure of the battery protection circuit package in which iii) the placement step has been completed. The configuration of the battery protection circuit package 300 shown in these drawings corresponds to the configuration of the battery protection circuit package 300 shown in Figs. 2A to 2C.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

51: first internal connection terminal
51a: one side of the first internal connection terminal
51b: the other side of the first internal connection terminal
51c: Folding axis
52: second internal connection terminal
250: Encapsulant
300: Battery protection circuit package
700: Battery cell
720: a pair of electrode tabs
720a:
720b:
800: Battery pack

Claims (5)

A battery cell in which a pair of electrode tabs including a positive electrode tab made of aluminum and a negative electrode tab made of nickel are protruded; And
An external connection terminal capable of directly contacting a connector pin on the set main board, a pair of internal connection terminals connected to the pair of electrode tabs, a battery protection circuit component, a battery protection circuit component, A battery protection circuit package having terminals and an encapsulant for exposing the internal connection terminals;
, ≪ / RTI &
The pair of internal connection terminals include first and second internal connection terminals disposed on both sides of the sealing material, and the first internal connection terminals are folded and bonded to the upper and lower surfaces of the positive electrode tab, And the second internal connection terminal is bonded to only one of the upper and lower surfaces of the negative electrode tab,
Wherein the electrode tab protruding from the battery cell is not folded and the main surface of the external connection terminal is parallel to the main surface of the battery cell.
Battery pack. delete The method according to claim 1,
The first internal connection terminal is folded on one side of the first internal connection terminal with the other side of the first internal connection terminal being folded about a folding axis, and one side of the first internal connection terminal is connected to the lower surface of the positive electrode tab The other side of the first internal connection terminal is joined to the upper surface of the positive electrode tab, and the second internal connection terminal is joined to the lower surface of the negative electrode tab. The method according to claim 1,
Wherein the main surface of the set main board and the main surface of the external connection terminal can be juxtaposed. Preparing a battery cell in which a pair of electrode tabs including a positive electrode tab made of aluminum and a negative electrode tab made of nickel protrude;
An external connection terminal capable of directly contacting with a connector pin on the set main board, first and second internal connection terminals respectively connectable to the positive electrode tab and the negative electrode tab, a battery protection circuit component, Preparing a battery protection circuit package including a sealing member which seals and exposes the external connection terminal and the internal connection terminal;
The first internal connection terminal is disposed so as to be in face-to-face contact with the lower surface of the positive electrode tab and the second internal connection terminal is disposed in face-to-face contact with the lower surface of the negative electrode tab, Folding on one side of the first internal connection terminal about the axis and placing the other side of the first internal connection terminal in a face-to-face contact with the upper surface of the positive electrode tab; And
Joining the first internal connection terminal and the positive electrode tab in a spot welding process, and bonding the second internal connection terminal and the negative electrode tab in a spot welding process;
, ≪ / RTI >
Wherein the first internal connection terminal is folded and joined to the upper and lower surfaces of the positive electrode tab and the second internal connection terminal is bonded to only one of the upper and lower surfaces of the negative electrode tab,
Wherein the electrode tab protruding from the battery cell is not folded and the main surface of the external connection terminal is parallel to the main surface of the battery cell.
A method of manufacturing a battery pack.

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