KR100601537B1 - Lithium Ion Secondary Battery - Google Patents

Abstract

The present invention relates to a lithium ion secondary battery, and more particularly, to a lithium ion secondary battery, characterized in that it is possible to quickly determine whether or not genuine by stamping a coded letter at a predetermined position of the lithium ion secondary battery case.

Description

Lithium Ion Secondary Battery

1 is an assembled perspective view assembled to a lithium ion secondary battery.

2 is a front view of a can type lithium ion secondary battery according to an embodiment of the present invention.

Figure 3 is a bottom view of the can-type lithium ion secondary battery according to another embodiment of the present invention.

Figure 4a is an enlarged view of a cipher character formed on the outer surface of the can of Figure 2a.

4B is a cross-sectional view taken along line A-A in FIG. 2A;

5A is an enlarged view of another cipher letter formed on the outer surface of the can of FIG. 2A;

5B is a cross-sectional view taken along the line B-B in FIG. 5A.

FIG. 6A is an enlarged view of another cipher letter formed on the outer surface of the can of FIG. 2A; FIG.

6B is a cross-sectional view taken along the line C-C.

7 is a schematic perspective view of a mold used to form a passphrase on a can of the present invention.

8 is a schematic perspective view of another mold used to form a passphrase on a can of the present invention.

9 is a front view of a cylindrical lithium ion secondary battery according to an embodiment of the present invention.

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

40: bare cell 42: can

50: circuit molding unit 60: password character

62: coating layer 64: cipher text portion

70, 80: mold 72, 82: mold body

76, 86: mold core 88: character core

The present invention relates to a lithium ion secondary battery, and more particularly, to a lithium ion secondary battery, characterized in that it is possible to quickly determine whether or not genuine by stamping a coded letter at a predetermined position of the lithium ion secondary battery case.

Secondary batteries have been researched and developed in recent years due to the possibility of recharging and miniaturization and large capacity. Representative examples of the recent development and use include nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium-ion (Li-ion) batteries.

Most of the bare cells in these secondary batteries are formed by storing an electrode assembly consisting of a positive electrode, a negative electrode, and a separator in a can, which is usually made of aluminum or an aluminum alloy, closing the can with a cap assembly, and then injecting and sealing an electrolyte solution into the can. do. The can may be formed of iron, but when it is formed of aluminum or an aluminum alloy, light weight of the battery may be achieved due to the light property of aluminum, and may not be corroded even when used for a long time under high voltage.

1 is a perspective view of a can-type lithium ion secondary battery.

In the can type lithium ion secondary battery, referring to FIG. 1, the bare cell 10 and the bare cell 10 and the bare cell 10 are formed by molding a safety device such as a protective circuit on the bare cell by resin. It is formed including a label (30) attached to the outer surface of the). In addition, if necessary, the lower cover 30 is attached to the lower portion of the bare cell 10.

The bare cell 10 may include a can 12 forming an appearance, an electrode assembly (not shown) inserted into the can 12, and a cap plate sealing the upper portion of the can 12. Not shown).

The can 12 of the bare cell 10 is formed of a ductile metal such as aluminum, and is drawn and molded by a mold. The can 12 is connected to the anode of the electrode assembly inserted therein. In addition, the surface of the bare cell 10 is printed with a letter 14 meaning the manufacturer and a series of information.

 The circuit molding part 20 is formed by molding a safety device such as a protective circuit on the bare cell by resin. On the upper surface of the circuit molding part, connection terminals 21 and 22 electrically connected to external electric devices are exposed.

The label 30 is formed of a film made of vinyl, polymer, or the like, and is attached to an outer surface of the bare cell 10 to protect the surface of the can 12 and to electrically insulate the can 12 from the outside. .

In general, secondary batteries accumulate high energy in a state where energy is charged, and in the process of charging, secondary batteries accumulate and receive energy from other energy sources. When an abnormality of a secondary battery such as an internal short circuit occurs in such a process or state, energy stored in the battery is released in a short time, which may cause safety problems such as ignition and explosion.

In particular, recently used lithium-based secondary battery has a high activity because the lithium itself has a high activity, when the abnormality occurs in the battery, the risk of fire or explosion increases by that much. In the case of a lithium ion secondary battery, only lithium in an ionic state, not lithium in a metal state, exists, thereby improving safety compared to a battery using metal lithium. However, materials such as negative electrodes and non-aqueous electrolytes, which are still used in secondary batteries, have a high risk of ignition or explosion when a battery error occurs due to flammability. Therefore, the lithium ion secondary battery is equipped with various safety devices to prevent fire or explosion due to an abnormality of the battery itself in the charged state or during the charging process.

However, in some cases, even if the safety is improved, there is a case of ignition or explosion due to overheating. In this case, a problem occurs in a secondary battery which is not a genuine product from a third party. In recent years, secondary batteries distributed in the market are manufactured with crude technology by third parties, and letters or labels printed on the surface of bare cells are marked as genuine and distributed to confuse the distribution order of the market and lose trust of genuine makers. There is a problem to make.

In particular, when the secondary battery is ignited or exploded due to overheating, the reliability of the genuine maker is further deteriorated. However, it is difficult to confirm whether the secondary battery in question is made in a genuine maker, and thus, the genuine maker has a problem that it is difficult to respond quickly. That is, the label attached to the outside of the secondary battery is easy to forge, so it is difficult to check whether the label is genuine or not, and it is difficult to quickly respond because time is required to accurately analyze the product.

The present invention has been made in order to solve the above problems, in particular to provide a lithium ion secondary battery, characterized in that it is possible to quickly determine whether or not a genuine code stamped in a predetermined position of the lithium ion secondary battery case. For the purpose of

Lithium ion secondary battery according to the present invention for achieving the above object is a secondary battery including a bare cell having a can is inserted into the electrode assembly and the top opening is closed by the cap assembly, formed in a predetermined position of the can And a cipher text, wherein the cipher text is engraved in the can.

In the present invention, the encryption character may be composed of at least one character, including at least one type of letters, symbols, figures.

delete

In addition, in the present invention, the cipher letter is preferably formed to include a letter meaning the manufacturer of the secondary battery.

delete

In addition, in the present invention, the cipher letter may be embossed in a predetermined region formed intaglio on the outer surface of the can.

In addition, in the present invention, the intaglio portion formed in the can may be formed by coating a fluorescent material or a paint that emits a specific color.

In addition, in the present invention, the coating layer formed on the intaglio portion may be formed to emit light according to the viewing angle.

In addition, in the present invention, it is preferable that the encryption character is formed to have a depth of engraved 5 to 50% of the can thickness.

In addition, in the present invention, the cipher letters are preferably formed in a round shape of the lower edge of the intaglio portion.

In addition, in the present invention, the cipher letter may be formed on the outer side or the inner side of the can.

In addition, in the present invention, the cipher letter may be formed on the outer surface or the inner surface of the bottom of the can.

In addition, in the present invention, the cipher character may be formed by a cipher character formed at a predetermined position of the molding groove of the mold in the process of forming the can by the mold.

In addition, in the present invention, the cipher text is inserted and fixed at a predetermined position of the mold for forming the can and may be formed by a core having the cipher text formed at the end.

In addition, in the present invention, the cipher character may be separately formed by a character core in which the cipher character is formed after the can is molded by a mold.

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

2 is a front view of a can type lithium ion secondary battery according to an embodiment of the present invention. 3 is a bottom view of a can type lithium ion secondary battery according to another embodiment of the present invention. 4A is an enlarged view of a cipher letter formed on an outer surface of the can of FIG. 2A. 4B is a cross-sectional view taken along the line A-A of FIG. 2A. 5A is an enlarged view of another cipher letter formed on the outer surface of the can of FIG. 2A. 5B is a sectional view taken along the line B-B in FIG. 5A. FIG. 6A illustrates an enlarged view of another cipher letter formed on the outer surface of the can of FIG. 2A. FIG. 6B is a sectional view taken along the line C-C. 7 shows a schematic perspective view of a mold used to form a passphrase in a can of the present invention. 8 shows a schematic perspective view of another mold used to form a passphrase in a can of the present invention. 9 is a front view of a cylindrical lithium ion secondary battery according to an embodiment of the present invention.

Referring to FIG. 2, the secondary battery according to the present invention includes a bare cell 40 and a cipher letter 60 formed at a predetermined position of the bare cell 40. The secondary battery illustrated in FIG. 2 may be formed as a can-type lithium ion secondary battery including a circuit molding part 50 on an upper portion of the bare cell 40.

The bare cell 10 is formed to include an electrode assembly (not shown) and a can 42 forming an appearance. The electrode assembly is formed by winding a positive electrode plate and a negative electrode plate and a separator that insulates them, and is inserted into the can 42.

The can 42 is formed of an iron alloy, aluminum or aluminum alloy, nickel or nickel alloy, but is not limited thereto. The can 42 is formed by a mold so that the inside is hollow and has a uniform thickness as a whole. The can 42 has the electrode assembly inserted therein, filled with an electrolyte, and the upper portion thereof is sealed by a cap assembly (not shown).

The cipher letter 60 is formed at a predetermined position on the inner or outer surface of the can 42 and is preferably formed on the outer surface of the can 42 so that it can be identified from the outside of the can 42. In addition, the code letter 60 may be formed at various locations such as the outer surface or the bottom surface of the can 42, preferably at the lower end or the bottom surface of the outer surface receiving less pressure during charging and discharging of the secondary battery Is formed. 3 illustrates a bottom view of the can type secondary battery, and illustrates a cipher letter 60 formed on the bottom surface of the can 42. In addition, when the label is attached to the outer surface of the can 42, the code letter 60 is formed on the outer surface to which the label of the outer surface of the can is attached, the lower cover is attached when the lower cover is attached It is formed on the bottom so that the encryption character 60 is protected. Alternatively, the cipher character 60 may be formed at a position opposite to the above so that the cipher character 60 can be directly seen from the outside. However, the present invention is not limited to the position where the encryption character 60 is formed.

The cipher character 60 is configured by an arrangement of at least one character, including at least one kind among letters, symbols, and figures. The letter may be a variety of letters, including Korean, English alphabet, German and the like. In addition, the symbol may include a symbol including a special symbol used in a special field, such as a mathematical symbol, a mathematical unit, a design field. Also, the figure may include a general figure such as a circle, a rectangle, a polygon, and a figure including a special figure used in a special field such as a design field. In addition, a bar code may be used as the encryption character 60. In addition to the letters, symbols, and figures, the cipher letter 60 may be used with various marks, and the type is not limited thereto.

In addition, the cipher character 60 is formed so as to identify the secondary battery maker only in the form of the cipher character itself, it can be formed so that it is impossible to forge by elaborately formed by a mold for molding the can. A method of forming the cipher text 60 will be described later. In addition, the cipher character 60 may be formed to include various information representing a manufacturer, a date and time of manufacture of a secondary battery, a manufacturing line, and the like.

Referring to FIGS. 4A and 4B, the cipher letter 60 is preferably formed intaglio in the can 42. Therefore, the cipher text 60 is formed by pressing a predetermined depth in accordance with the form of the cipher text 60 on the surface of the can 42. However, if the cipher character 60 is formed too deep, the can becomes vulnerable, so care must be taken in determining its depth. The cipher text 60 is such that the depth is preferably formed within 5 to 50% of the thickness of the can and preferably within 30% of the thickness of the can. When the thickness of the cipher text 60 is formed smaller than 5% of the can thickness, the cipher text is not formed clearly. In addition, the corner portion 61 of the cipher character 60 is formed to have a round shape to prevent the occurrence of cracks in the corner portion. The cipher text 60 is formed by arranging a predetermined number of characters according to the content of the information to be implied.

5A and 5B illustrate an encryption character formed in the can according to another embodiment of the present invention.

The cipher text 60 is formed intaglio at a predetermined position of the can 42, the coating layer 62 is formed on the surface of the cipher text 60 formed in the engraved coating of a fluorescent material or a specific color. Can be. As described above, when the coating layer 62 is formed on the engraved portion of the cipher letter 60 by fluorescent material or paint, the secondary battery may be formed from characteristics such as color of the coating layer 62 in addition to the shape of the cipher letter 60. You can check the authenticity.

The fluorescent material used for the coating layer 62 is a heat-resistant fluorescent light that does not deteriorate in color or the like at least 100 ° C. so as not to be deteriorated by a temperature change of the can 42 appearing during charging and discharging of a secondary battery among commonly used fluorescent materials. Use substance.

In addition, the said paint 62 also uses the heat-resistant paint. In addition, the paint may be formed to emit a special light according to the angle of view of the coating layer 62, preferably using a pigment in the color of the paint constituent material of the pigment pigment or a plate.

6A and 6B, the cipher text 60 may be embossed in the cipher text 64 formed as a whole in a predetermined area of the surface of the can 42. When the cipher character 60 is embossed, when the protruding cipher character 60 is formed higher than the surface of the can 42, the thickness of the secondary battery is partially increased, so that the protruding height of the can 42 is increased. It is necessary to form lower than the surface. In addition, even if the cipher text 60 is formed as shown in Figure 6a, as shown in the embodiment of Figure 5a may be formed by coating a fluorescent material or paint on the intaglio portion.

7 shows an example of a mold forming the cipher text 60. The mold 70 represents the shape of the mold used in the last step of the mold used in each step in the forming process of the can. The mold 70 is formed to include a mold body 72 and a mold core 76. The mold body 72 is formed to be separated into two parts 72a and 72b, and a molding groove 74 corresponding to the outline shape of the can 42 to be formed is formed from the center to the top. At a predetermined position on the inner surface of the forming groove 74, the password characters (60a, 60b) formed in the can 42 is formed directly, it may be formed on the inner surface or bottom surface of the forming groove (74). The mold core 76 is formed in a shape corresponding to the internal shape of the can 42 to be molded, and is inserted into the molding groove 74 of the mold body 72 to form the can 42.

Therefore, the cipher character 60 is directly formed on the can 42 in the process of forming the can 42 by the mold 70. When the cipher text 60 is formed in a precise form by the mold 70, it is impossible to forge the cipher text by a third party, so it is possible to identify whether the secondary battery is genuine using only the cipher text. Will be.

8 shows another example of a mold forming the cipher text. The mold 80 includes a mold body 82, a mold core 86, and a character core 88. The mold main body 82 is formed to be separated into two parts 82a and 82b, and a molding groove 84 corresponding to the outline shape of the can 42 to be formed is formed from the center to the top. In addition, at a predetermined position of the mold 80, a letter core hole 85 penetrating from the outer surface of the mold body 82 to the molding groove 84 is formed. The mold core 86 is formed in a shape corresponding to the inner shape of the can 42 to be molded, and is inserted into the molding groove 84 of the mold body 82 to form the can 42. The character core 88 has a password character (60c) is formed on the end surface, is inserted into the core hole 85 of the mold body 82 is fixed so that the end surface is located on the inner surface of the molding groove (84). . Therefore, in the process of forming the can 42 using the mold 80, a cipher letter formed in the character core is formed in the can 42. When the cipher character 60c is formed in the character core 88, it is possible to form various cipher characters on the can 42 or form various patterns on the cipher characters.

On the other hand, the cipher character is of course possible to be formed using the character core 88 after the molding of the can 42 by the mold 80 is completed.

In the above description that the password is formed on the can of the can-type lithium ion secondary battery, the password can also be formed in the cylindrical can used for the cylindrical lithium-ion secondary battery. That is, as shown in FIG. 9, the secondary battery may have a coded letter formed outside the cylindrical can of the cylindrical lithium ion secondary battery.

As described above, the present invention is not limited to the specific preferred embodiments described above, and any person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Various modifications are possible, of course, and such changes are within the scope of the claims.

According to the present invention, since the identification of the genuine article is easy to be identified by a precisely formed cipher in the predetermined position of the can prevent the distribution of counterfeit goods, and if the secondary battery is ignited or exploded can be quickly identified by the authenticity to cope with It has an effect.

In addition, according to the present invention, since the cipher letters are directly formed by the intaglio on the metal can, unlike the case where the load number or the model number is displayed on the label, the cipher letters remain in the case of ignition, so that there is an effect that can be easily confirmed. .

In addition, according to the present invention, when the production time of the secondary battery maker is displayed on the cipher text, it is possible to grasp the production history of the secondary battery in question from the cipher text, and to quickly identify the cause internally.

Claims (15)

In the lithium ion secondary battery comprising a bare cell is inserted into the electrode assembly and the top opening has a can sealed by the cap assembly, It includes a code character formed in a predetermined position of the can, The cipher letter is engraved in the can is formed lithium ion secondary battery. The method of claim 1, The encryption character is a lithium ion secondary battery, characterized in that composed of at least one character, including at least one type of letters, symbols, figures. delete The method of claim 2, The cipher letter is a lithium ion secondary battery, characterized in that it comprises a character representing the manufacturer of the lithium ion secondary battery. delete The method of claim 1, The cipher character is a lithium ion secondary battery characterized in that it is embossed in a predetermined area formed intaglio on the outer surface of the can The method according to claim 1 or 6, Wherein the code letter is a lithium ion secondary battery, characterized in that the coating layer is formed by a fluorescent material or a paint that emits a specific color in the intaglio. The method of claim 7, wherein The coating layer formed on the intaglio portion is a lithium ion secondary battery, characterized in that formed to emit light according to the viewing angle. The method according to claim 1 or 6, The encryption character is a lithium ion secondary battery, characterized in that the depth is engraved 5 to 50% of the can thickness. The method according to claim 1 or 6, The cipher letter is a lithium ion secondary battery, characterized in that the lower edge of the intaglio portion is formed in a round shape. The method of claim 1, The code letter is a lithium ion secondary battery, characterized in that formed on the outer surface or the inner surface of the can. The method of claim 1, The cipher letter is a lithium ion secondary battery, characterized in that formed on the outer surface or the inner surface of the bottom of the can. The method of claim 1, The cipher text is a lithium ion secondary battery, characterized in that formed by the cipher text formed in a predetermined position of the molding groove of the mold in the process of forming the can by the mold. The method of claim 1, The cipher letter is inserted into a predetermined position of the mold for forming the can is fixed and the lithium ion secondary battery, characterized in that formed by the core formed with the cipher text at the end. The method of claim 1, The cipher character is a lithium ion secondary battery, characterized in that formed separately by the character core formed with the cipher character after the can is molded by a mold.

Images