KR102139312B1 - Secondary battery and manufacturing method for secondary battery - Google Patents

Abstract

The present invention relates to a secondary battery and a secondary battery manufacturing method capable of being manufactured in various shapes.
In addition, according to the present invention, an electrode assembly in which a cathode tab and an anode tab are formed, one side is opened, the base plate on which the electrode assembly is seated, and the base plate are provided to electrically connect the cathode tab of the electrode assembly, It characterized in that it comprises a negative electrode terminal electrically insulated from the base plate and a side plate coupled to the one side so as to cover the open one side of the base plate.

Description

Manufacturing method of secondary battery and secondary battery{SECONDARY BATTERY AND MANUFACTURING METHOD FOR SECONDARY BATTERY}

The present invention relates to a secondary battery and a secondary battery manufacturing method, and more particularly, to a secondary battery and a secondary battery manufacturing method capable of being manufactured in various shapes.

Cells (cells) that generate electric energy through physical or chemical reactions of materials and supply power to the outside are unable to acquire AC power supplied to buildings depending on the living environment surrounded by various electric and electronic devices. It is used when the case or DC power is needed.

Among these batteries, primary and secondary batteries, which are chemical batteries using chemical reactions, are generally used, and primary batteries are commonly referred to as batteries, and are consumable batteries. In addition, the secondary battery is a rechargeable battery that is manufactured using a material in which many redox processes between a current and a material are repeated. When a reduction reaction is performed on a material by electric current, the power is charged and the oxidation reaction on the material is performed. When performed, the power is discharged, and electricity is generated while the charge-discharge is repeatedly performed.

On the other hand, the lithium ion battery of the secondary battery is coated with an active material on a positive electrode conductive foil and a negative electrode conductive foil, respectively, with a constant thickness, and a separation membrane is interposed between the two conductive foils to form a plurality of jelly rolls or cylinders several times. The electrode assembly produced by winding is stored in a cylindrical or square can, pouch, etc. and sealed.

Japanese Unexamined Patent Publication No. 2002-164025 discloses a conventional prismatic secondary battery.

In such a conventional prismatic secondary battery, the top cap assembly is coupled to the can to seal the can while electrically connecting the electrode assembly built into the can to the outside of the can.

In general, the rivet of the cathode terminal connected to the electrode assembly and electrically connecting the electrode assembly to the outside of the can is assembled to penetrate the base plate of the top cap assembly.

However, recently, with the development of smart electronic devices, the trend of miniaturization and slim to design electronic devices to be portable, and as the shape of smart electronic devices is diversified, installing secondary batteries in these electronic devices In order to reduce the size of the secondary battery and to design a variety of shapes, the conventional secondary battery is limited in the design of the size and shape by the configuration of assembling the secondary battery by receiving the electrode assembly in the can in the longitudinal direction of the can. There is a problem.

Therefore, the present invention has been devised to solve the above problems, and the problem of the present invention is to fabricate a secondary battery and a secondary battery capable of increasing the design freedom of size and shape by installing the electrode assembly in the transverse direction of the base plate. Is to provide a way.

In the secondary battery according to the present invention, an electrode assembly in which a negative electrode tab and a positive electrode tab are formed, one side is opened, and the base plate on which the electrode assembly is seated is provided on the base plate, and the negative electrode tab of the electrode assembly is electrically provided. It is connected, and includes a negative electrode terminal electrically insulated from the base plate and a side plate coupled to the one side to cover the opened one side of the base plate, wherein the base plate 13 is an electrode assembly 1 The electrode assembly (1) while including a support surface (13a) for supporting one surface of the, and the wall surface (13b) is provided to be connected along the rim of the support surface (13a) and supports the rim surface of the electrode assembly (1) One side facing the other side of the structure has an open structure, the adhesive member 20, the negative electrode tab 3 is connected to one end of the electrode assembly 1 is supported, the support surface 13a of the base plate 13 is supported While being provided in the insulator between the one end of the electrode assembly (1) and the support surface (13a) of the base plate (13), the can plate member (10) having the base plate (13) and the side plate (15) Including, but the electrode assembly (1) by the structure that is received in the transverse direction of the base plate 13 is formed on the surface of the can member 10, a single layer 11 in the shape of a staircase, the can member 10 The electrode assembly 1 accommodated in the interior is formed to correspond to the shape of the can member 10 in which the single layer 11 having a step shape is formed, and the secondary battery is formed in a polygonal shape or an irregular shape. .

The base plate may have one side surface in the transverse direction open.

The electrode assembly may be accommodated in the base plate through one side opening in the transverse direction of the base plate.

The secondary battery according to the present invention may further include an adhesive member attached between the base plate on which the negative electrode tab is formed and the base plate to electrically insulate the base plate.

The electrode assembly may further include an insulating member provided between the side on which the negative electrode tab is formed and the base plate to electrically insulate the base plate.

The side plate is coupled to an open side of the base plate to form a can member, and the positive electrode tab can be electrically connected to the can member.

The secondary battery may be formed in any one or more of a step shape, a polygon shape, and an irregular shape.

The method of manufacturing a secondary battery according to the present invention includes a base plate preparation step of preparing a base plate having an opening opened in a transverse direction, a cathode terminal installation step of installing a cathode terminal electrically insulated at one end of the base plate, the And an electrode assembly installation step of installing the electrode assembly in the transverse direction inside the base plate through the opening of the base plate and a finishing step of closing the opening by installing a side plate in the opening of the base plate, Cathode terminal installation step (S2) includes an adhesive member attaching step of attaching an adhesive member having electrical insulation to the inner surface of the base plate as one end side inside the base plate, wherein the base plate 13 is an electrode assembly (1) the support assembly (13a) for supporting one surface, and is provided to be connected along the rim of the support surface (13a) and includes a wall surface (13b) for supporting the rim surface of the electrode assembly (1) while the electrode assembly (1) One side facing the other side of the structure has an open structure, the adhesive member 20, the negative electrode tab 3 is connected to one end of the electrode assembly 1 is connected to the support surface of the base plate 13 is supported While being provided in (13a), insulated between one end of the electrode assembly (1) and the support surface (13a) of the base plate (13), the can member having the base plate (13) and the side plate (15) Including (10), the surface of the can member 10 is formed with a single layer 11 in the shape of a staircase, the thickness of which gradually decreases, and the secondary battery is characterized in that it is formed in a polygonal or irregular shape.

The cathode terminal installation step may include an adhesive member attaching step of attaching an adhesive member inside one end of the base plate.

The cathode terminal installation step may include an insulation member installation step of electrically insulating the base plate by installing an insulation member between the cathode terminal and the electrode assembly.

The finishing step may include a sealing step of sealing between the base plate and the side plate.

According to the present invention, since the secondary battery is assembled by receiving the electrode assembly in the lateral direction of the base plate, there is an effect that the secondary battery can be manufactured in various shapes.

According to the present invention, since the secondary battery is assembled by accommodating the electrode assembly in the lateral direction of the base plate, it is possible to make the thickness thinner than in the prior art.

According to the present invention, by attaching an adhesive member capable of electrical insulation to the upper inner wall of the base plate, there is an effect of blocking the short circuit caused by the melting of the separator at the top of the electrode assembly in a high temperature test such as a hot box.

1 is a perspective view schematically showing a secondary battery according to an embodiment of the present invention.
2 is an exploded perspective view showing the exploded view of FIG. 1.
3 is an exploded perspective view showing an exploded secondary battery according to another embodiment of the present invention.
4 is a front view showing the inner surface of the base plate in FIG. 3 from the front.
5 to 7 is a perspective view showing a secondary battery according to another embodiment of the present invention.
8 is a flowchart sequentially showing a method of manufacturing a secondary battery according to an embodiment of the present invention.

Hereinafter, a secondary battery and a secondary battery manufacturing method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The terms or words used in the present specification and claims should not be interpreted as being limited to ordinary or lexical meanings, and the inventor can appropriately define the concept of terms to describe his or her invention in the best way. Based on the principle that it should be interpreted as meanings and concepts consistent with the technical idea of the present invention. Therefore, the configuration shown in the embodiments and drawings described in this specification is only one of the most preferred embodiments of the present invention and does not represent all of the technical spirit of the present invention. It should be understood that there may be equivalents and variations.

In the drawings, the size of each component or a specific part constituting the component is exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect the actual size. When it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the description will be omitted.

1 is a perspective view schematically showing a secondary battery according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the exploded view of FIG. 1.

1 to 2, in the secondary battery according to an embodiment of the present invention, the electrode assembly 1 on which the negative electrode tab 3 and the positive electrode tab 5 are formed, one side is opened, and the electrode Assembly (1) is provided on the base plate 13, the base plate 13 is seated therein, the negative electrode tab 3 of the electrode assembly 1 is electrically connected, the base plate 13 is electrically It characterized in that it comprises a negative electrode terminal 100 and the side plate 15 coupled to the one side to cover the open one side of the base plate (13).

The electrode assembly 1 can be produced by laminating a positive electrode coated with a positive electrode active material, a negative electrode coated with a negative electrode active material, and a separator interposed between the positive electrode and the negative electrode multiple times.

The positive electrode may be an aluminum plate, and may include a positive electrode active material portion coated with a positive electrode active material, and a positive electrode non-coated portion not coated with a positive electrode active material.

The positive electrode active material may be a lithium-containing transition metal oxide such as LiCoO2, LiNiO2, LiMnO2, or LiMnO4 or a lithium chalcogenide compound.

The positive electrode active material portion is formed, for example, by applying a positive electrode active material to a portion of at least one surface of an aluminum plate, and the remaining portion of the aluminum plate to which the positive electrode active material is not applied may be a positive electrode uncoated portion.

And the positive electrode tab 5 is formed to extend from the positive electrode uncoated portion so that the positive electrode can be electrically connected to the outside.

The negative electrode may be a copper plate, and may include a negative electrode active material portion coated with a negative electrode active material and a negative electrode non-coated portion not coated with a negative electrode active material.

The negative electrode active material may be crystalline carbon, amorphous carbon, carbon composite, carbon material such as carbon fiber, lithium metal or lithium alloy, and the like.

The negative electrode active material portion is formed, for example, by applying a negative electrode active material to a portion of at least one surface of the copper plate, and the remaining portion of the copper plate without the negative electrode active material may be a negative electrode non-coated portion.

In addition, the negative electrode tab 3 is formed to extend from the negative electrode uncoated portion so that the negative electrode can be electrically connected to the outside.

The separator may be any one selected from the group consisting of, for example, polyethylene (PE), polystyrene (PS), polypropylene (PP), and copolymers of polyethylene (PE) and polypropylene (PP). It can be prepared by coating a polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP co-polymer).

The can member 10 is a metal-made container, and is generally made of aluminum or aluminum alloy which is light and easy to cope with corrosion.

The can member 10 includes a base plate 13 and a side plate 15.

The base plate 13 has one side in the transverse direction opened, and the electrode assembly 1 is seated inside the base plate 13 in the transverse direction of the base plate 13 through the opened one side and accommodated together with the electrolyte. do.

The side plate 15 is sealingly coupled to one side of the base plate 13 to cover the opened one side of the base plate 13.

At this time, the sealing between the base plate 13 and the side plate 15 may be processed.

The cathode terminal 100 may be installed at one end of the base plate 13 so as to be electrically insulated from the can member 10.

The cathode terminal 100 may include a rivet, an outer gasket, an inner gasket, and an inner plate.

The rivet is electrically connected to the negative electrode tab 3 of the electrode assembly 1 so that the negative electrode tab 3 can be in electrical communication with the outside of the secondary battery.

The outer gasket 130 is coupled between the outer end of the rivet exposed to the outside of the base plate 13 and the outer surface of the base plate 13 to electrically insulate between the rivet and the can member 10.

The inner plate is provided on the inner surface of the base plate 13 so as to be electrically connected to the inner end of the rivet, so that the cathode tab 3 of the electrode assembly 1 sufficiently secures an accessible area, so that the inner plate of the electrode assembly 1 The negative electrode tab 3 and the inner end of the rivet are guided so as to be easily electrically connected.

The inner gasket is coupled between the inner end of the rivet inserted into the base plate 13 and the inner surface of the base plate 13 to electrically insulate between the inner plate and the can member 10.

And the positive electrode tab 5 of the electrode assembly 1 is electrically connected to one side of the can member 10, in one embodiment it can be electrically connected to one side of the base plate 13, in another embodiment the side plate It can be electrically connected to one side of (15).

In addition, an insulating member 21 is installed between the end of the electrode assembly 1 on the side where the negative electrode tab 3 is formed and the inner end of the base plate 13 from the negative electrode tab 3 of the electrode assembly 1. The can member 10 may be electrically insulated.

3 is an exploded perspective view showing a secondary battery according to another embodiment of the present invention, and FIG. 4 is a front view showing the inner surface of the base plate in FIG. 3 from the front.

3 to 4, in the secondary battery according to another embodiment of the present invention, the end of the cathode tab 3 of the electrode assembly 1 is formed on the side of the base plate 13 and the inner end of the The adhesive member 20 is attached to the inner surface of the base plate 13 therebetween.

The adhesive member 20 is for electrically insulating the base plate 13, and in particular, in a high-temperature test such as a hot box, one end of the electrode assembly 1 melts and the cathode is exposed to the base plate 13. When the negative electrode exposed during contact with the base plate 13 can be prevented from occurring short.

5 to 7 is a perspective view showing a secondary battery according to another embodiment of the present invention.

As illustrated in FIG. 5, in the secondary battery according to another embodiment of the present invention, the electrode assembly 1 is staired to the surface of the can member 10 by a structure in which the base plate 13 is received in the lateral direction. A single layer 11 having a shape can be formed.

At this time, the electrode assembly 1 accommodated inside the can member 10 may be formed to correspond to the shape of the can member 10.

And as shown in Figure 6, the secondary battery according to another embodiment of the present invention is a polygon, such as a square, pentagon, hexagon, etc. by the structure in which the electrode assembly 1 is received in the lateral direction of the base plate 13 A secondary battery can be produced.

At this time, the electrode assembly 1 accommodated inside the can member 10 may be formed to correspond to the shape of the can member 10.

And as shown in Figure 7, the secondary battery according to another embodiment of the present invention to produce a secondary battery of an irregular shape by a structure in which the electrode assembly 1 is received in the lateral direction of the base plate 13 Can.

At this time, the electrode assembly 1 accommodated inside the can member 10 may be formed to correspond to the shape of the can member 10.

Hereinafter, a method for manufacturing a secondary battery according to the present invention will be described in detail with reference to the drawings.

8 is a flowchart sequentially showing a method of manufacturing a secondary battery according to an embodiment of the present invention.

As illustrated in FIG. 8, a method for manufacturing a secondary battery according to an embodiment of the present invention includes a base plate preparation step (S1), a cathode terminal installation step (S2), an electrode assembly installation step (S3), and a closing step (S4). ).

The base plate preparation step (S1) is a step of manufacturing the base plate so that an opening having a side surface in the transverse direction is formed.

Cathode terminal installation step (S2) is a step of installing a negative terminal electrically insulated on one end of the base plate.

Here, the cathode terminal installation step (S2) includes an adhesive member attaching step of attaching an adhesive member inside one end side of the base plate, and when the one end of the electrode assembly installed on the base plate is exposed to high heat, the separator is subject to high heat. Melting may expose the cathode.

At this time, as the exposed negative electrode is in contact with the adhesive member attached to the base plate to be electrically insulated from the base plate, a short circuit that may occur when the negative electrode contacts the base plate can be prevented.

In addition, the cathode terminal installation step (S3) may include an insulation member installation step of installing an insulation member inside one end side of the base plate.

That is, the insulating member is provided between the negative electrode terminal and the electrode assembly so that the base plate is electrically insulated from the negative electrode tab.

The electrode assembly installation step (S3) is a step of receiving and installing the electrode assembly in the base plate in the lateral direction of the base plate through the opening opening in the lateral direction of the base plate.

The closing step (S4) is a step in which the opening is sealed by installing a side plate in the opening of the base plate.

Here, the finishing step (S4) may include a sealing step of sealing between the base plate and the side plate to improve the sealing force of the side plate sealing the opening of the base plate.

According to the present invention as described above, since the secondary battery is assembled by receiving the electrode assembly in the lateral direction of the base plate, there is an effect that the secondary battery can be manufactured in various shapes.

Further, according to the present invention, since the secondary battery is assembled by accommodating the electrode assembly in the lateral direction of the base plate, it is possible to produce a thinner thickness than the conventional one.

In addition, according to the present invention, by attaching an adhesive member capable of performing electrical insulation on the upper inner wall of the base plate, the separator at the top of the electrode assembly is melted in a high-temperature test such as a hot box, thereby blocking the short circuit caused by the cathode being exposed. have.

As described above, the secondary battery and the secondary battery manufacturing method according to the present invention have been described with reference to the exemplified drawings, but the present invention is not limited by the embodiments and drawings described above, and the present invention is within the scope of the claims. Various modifications and variations are possible by those skilled in the art.

1: electrode assembly
3: Cathode tab
5: anode tab
10: No can
11: fault
13: base plate
15: side plate
20: adhesive member
21: insulating member
100: negative terminal

Claims (11)

As a secondary battery,
An electrode assembly 1 on which the cathode tab 3 and the anode tab 5 are formed;
A base plate 13 on which one side is opened and on which the electrode assembly 1 is seated;
A negative electrode terminal 100 provided on the base plate 13 and electrically connected to the negative electrode tab 3 of the electrode assembly 1 and electrically insulated from the base plate 13;
A side plate 15 coupled to the one side to cover the opened one side of the base plate 13; And
It is attached between the base plate 13 and the side on which the negative electrode tab 3 of the electrode assembly 1 is formed to electrically insulate the base plate 13, but is attached to the inner surface of the base plate 13, Includes; adhesive member 20 having electrical insulation;
The base plate 13 is provided with a support surface 13a supporting one surface of the electrode assembly 1 and connected along the rim of the support surface 13a and a wall surface supporting the edge surface of the electrode assembly 1 While (13b) is included, one side facing the other surface of the electrode assembly 1 has an open structure,
The adhesive member 20 is provided on the support surface 13a of the base plate 13 where one end of the electrode assembly 1 to which the cathode tab 3 is connected is supported, and one end of the electrode assembly 1 and the Insulating between the support surfaces 13a of the base plate 13,
A can member (10) having the base plate (13) and the side plate (15) is provided, but the electrode assembly (1) is a can member (10) by a structure that is received in the lateral direction of the base plate (13). ) Is formed on the surface of the stepped single layer 11,
The electrode assembly 1 accommodated inside the can member 10 is formed to correspond to the shape of the can member 10 in which the stepped single layer 11 is formed,
The secondary battery is characterized in that the secondary battery is formed in a polygonal shape or an irregular shape. delete The method according to claim 1,
The electrode assembly (1) is a secondary battery, characterized in that accommodated in the base plate (13) through one side opened in the transverse direction of the base plate (13). delete delete The method according to claim 1,
The side plate 15 is coupled to an open side of the base plate 13 to form a can member 10,
The positive electrode tab 5 is a secondary battery, characterized in that electrically connected to the can member (10). delete As a secondary battery manufacturing method,
A base plate preparation step (S1) of preparing a base plate having an opening opened in a transverse direction;
A cathode terminal installation step (S2) of installing a cathode terminal electrically insulated at one end of the base plate;
An electrode assembly installation step (S3) of installing the electrode assembly in the transverse direction inside the base plate through the opening of the base plate; And
A closing step (S4) of closing the opening by installing a side plate in the opening of the base plate; Including,
The cathode terminal installation step (S2) includes an adhesive member attaching step of attaching an adhesive member having electrical insulation to the inner surface of the base plate as one end side inside of the base plate,
The base plate 13 is provided with a support surface 13a supporting one surface of the electrode assembly 1 and connected along the rim of the support surface 13a and a wall surface supporting the edge surface of the electrode assembly 1 While (13b) is included, one side facing the other surface of the electrode assembly 1 has an open structure,
The adhesive member 20 is provided on the support surface 13a of the base plate 13 where one end of the electrode assembly 1 to which the cathode tab 3 is connected is supported, and one end of the electrode assembly 1 and the Insulate between the support surfaces 13a of the base plate 13,
A can member (10) having the base plate (13) and the side plate (15) is provided, but the electrode assembly (1) is a can member (10) by a structure that is received in the lateral direction of the base plate (13). ) Is formed on the surface of the stepped monolayer 11,
The electrode assembly 1 accommodated inside the can member 10 is formed to correspond to the shape of the can member 10 in which the stepped single layer 11 is formed,
The secondary battery is a secondary battery manufacturing method characterized in that it is formed in a polygonal or irregular shape. delete delete The method according to claim 8,
The closing step (S4) is a secondary battery manufacturing method characterized in that it comprises a sealing step of sealing between the base plate and the side plate.

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