KR101875533B1 - A jig for connecting wires and a secondary battery pack manufactured using the same - Google Patents

Abstract

The present invention relates to a secondary battery pack including at least one battery cell in which an electrode assembly composed of a positive electrode, a negative electrode and a separator is sealed in a battery case to electrically connect a secondary battery pack to the outside, A first jig member in which at least one seating groove is formed to mount the wire assembly, and a second jig member in which the first jig member is mounted, And a wire connecting jig.

Description

A jig for wire connection and a secondary battery pack manufactured using the jig for a connecting wire

The present invention relates to a jig for wire connection.

As technology development and demand for mobile devices have increased, the demand for secondary batteries as energy sources has been rapidly increasing. Many researches have been conducted on lithium secondary batteries with high energy density and discharge voltage among such secondary batteries. .

The secondary battery can be used as an energy source for power devices such as electric bikes (E-bike), electric vehicles (EV), and hybrid electric vehicles (HEV) as well as mobile and wireless electronic devices such as mobile phones, digital cameras, There is a lot of interest.

In a small device such as a cellular phone or a camera, a small battery pack in which one battery cell is packed is used, while a medium and large-sized device such as a notebook computer or an electric car uses two or more battery cells (hereinafter, A battery pack in which a battery pack in which a plurality of battery packs are connected in parallel and / or in series is packed.

The lithium secondary battery used in such a battery pack has excellent electrical characteristics, but has a low safety. For example, in a lithium secondary battery, decomposition reaction of an active material and an electrolyte, which are battery components, is caused in an abnormal operation state such as overcharging, overdischarge, exposure to a high temperature, electric short, and the like, heat and gas are generated, May further accelerate the decomposition reaction to cause ignition or explosion.

Therefore, a lithium secondary battery is provided with a protection circuit that cuts off the current during overcharge, overdischarge, and overcurrent, a PTC element (PTC element) that cuts off the current due to a rise in resistance when the temperature rises, A safety system such as a safety vent for shutting off or exhausting gas is provided. For example, in a cylindrical small secondary battery, a PTC element and a safety vent are usually provided on an anode / separator / cathode electrode assembly (power generation element) built in a cylindrical can, and a square or pouch type small secondary battery A protective circuit module and a PTC device are mounted on the upper end of a rectangular can or a pouch type case in which the power plant is sealed in a sealed state and a safety system such as a BMS (Battery Management System) Respectively.

In order to construct a battery pack including such a lithium secondary battery, an electrical connection work is required to connect the at least one lithium secondary battery to the external power device.

In a conventional method for connecting such a lithium secondary battery, a plurality of wires are arranged one by one in a wiring block, wherein the wiring block is composed of a wire clamping portion, a wire cutting portion and a terminal crimping portion, Placing an insulating sheath wire in one wiring block into the other wiring block so that the wire is securely fixed to the wire clamping portion while the wire is extended over the two wiring blocks in a predetermined length so as to cut the wire, Moving the workbench from the wire arrangement position to the wire filling position while separating the wire cut portion and the terminal compression portion from the wire clamping portion in order to clarify the gap between the wire clamping portion and the wire clamping portion; Stripped insulation cloth Moving the work table from the wire peeling position to the terminal crimping position while moving the terminal crimping portion to the wire clamping portion, and pressing the terminal to the helical portion of the wire, .

Generally, however, in such a complicated work process, a structure that is moved through a plurality of work positions, for example, a process of supplying a wire harness and a process of assembling it are separately performed. Therefore, This may result in a disorder or twist. In this case, there is a problem that the wires must be rearranged individually, which leads to a delay in the work process and a decrease in productivity.

Therefore, there is a high need for a technology that can fundamentally solve these problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

Specifically, the object of the present invention is to provide a core jig having a specific structure by first attaching a wire to a core jig having a specific structure and then simply mounting the core jig to the main jig to complete wire alignment and assembly, The wire re-joining operation of the core jig is completed.

It is still another object of the present invention to provide a wire connecting core capable of reducing the production cost of an additional mold by standardizing the structure of the base for injection molding the core jig and replacing the core jig only in accordance with standards such as a wire assembly, Jig. ≪ / RTI >

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a jig for wire connection, comprising: an electrode assembly including an anode, a cathode, and a separator, electrically connecting a secondary battery pack including at least one battery cell, A wire connecting jig for welding wires to an external input / output terminal on a circuit board of the secondary battery pack,

A wire assembly including the wires;

A first jig member having at least one seating groove for receiving the wire assembly; And

A second jig member to which the first jig member is mounted;

. ≪ / RTI >

Accordingly, since the wires are first mounted on the core jig having a specific structure and then the core jig is simply mounted on the main jig to complete the wire alignment and assembly, the wire reordering operation that occurs during the work process can be omitted.

In one specific example, the first jig member may be a structure detachably mounted from the second jig member. Preferably, the second jig member may have a structure in which a mounting groove corresponding to the shape of the first jig member is formed to facilitate mounting, and the manner in which the first jig member is mounted on the second jig member is not particularly limited And can be achieved, for example, by a hook fastening method.

In addition, the wire assembly may be a structure including a connector housing for connecting the wires. Specifically, the seating grooves of the first jig member may include a first seating portion in which the wires are branched and spaced apart at a predetermined interval, And a second seating groove on which the wire housing is seated.

Therefore, since the first jig member is standardized and the first and second mounting grooves are formed in a shape corresponding to the shape or size of the wire assembly, the second jig member can be interchangeably fastened to the second jig member, It is applicable.

In another specific example, the side surface of the first jig member may further include a guide member mounted on the side surface of the first jig member in order to prevent rocking. For example, the second jig member may have a guide groove May be formed.

In the above structure, the guide member is preferably slidably coupled to the second jig member, but is not limited thereto.

In a specific example, the guide member is provided with a separate fastening groove, and the second jig member is provided with a fastening protrusion. Therefore, when the guide member is slidably coupled to the second jig member, And can be stably mounted.

The first jig member is preferably formed by injection molding. In a specific example, the first jig member may be formed of a material of polyester (PE).

The jig for wire connection according to claim 1, wherein the seating groove is formed in a semi-elliptical shape in vertical section.

In one preferred example, the second jig member may be aluminum or Bakelite.

The present invention relates to a connection method for connecting a wire to a secondary battery pack using a wire connecting jig,

Placing the wire assembly on the first jig member;

Aligning the wires with the seating groove of the first jig member;

Mounting the first jig member to a second jig member;

Welding the aligned wires to the circuit board; And

Removing the first jig member from the second jig member after welding is completed;

And a connection method.

The present invention also provides a secondary battery manufactured by a method of connecting using a jig for wire connection and a battery pack including the secondary battery as a unit battery.

For reference, a typical lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing a lithium salt.

The positive electrode is prepared, for example, by coating a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, and then drying the mixture. Optionally, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; A Ni-site type lithium nickel oxide expressed by the formula LiNi _1-x M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); Formula _{LiMn 2-x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like. However, the present invention is not limited to these.

The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for suppressing the expansion of the anode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery. Examples of the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The negative electrode is manufactured by applying and drying a negative electrode active material on a negative electrode collector, and if necessary, the above-described components may be selectively included.

Examples of the negative electrode active material include carbon such as non-graphitized carbon and graphite carbon; _{Li x Fe 2 O 3 (0≤x≤1} ), Li x WO 2 (0≤x≤1), Sn x Me 1-x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, Halogen, 0 < x &lt; Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m and the thickness is generally 5 to 300 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

The non-aqueous electrolyte solution containing a lithium salt is composed of a polar organic electrolyte and a lithium salt. As the electrolytic solution, a non-aqueous liquid electrolytic solution, an organic solid electrolyte, an inorganic solid electrolyte and the like are used.

Examples of the nonaqueous liquid electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can be used.

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

For the purpose of improving the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride and the like are added It is possible. In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.

The present invention provides a device using the secondary battery as a power source, and preferable examples of the device include a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook, a LEV (Light Electronic Vehicle) Automobiles, hybrid electric vehicles, plug-in hybrid electric vehicles, and electric power storage devices.

Electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric power storage devices, etc. are well known in the art, and a detailed description thereof is omitted here.

As described above, the wire connecting jig and the secondary battery including the wire connecting jig according to the present invention can be manufactured by first attaching a wire to a core jig having a specific structure and then simply mounting the core jig to the main jig, There is no need to perform a separate wire reordering operation. Thus, the work process is facilitated and simplified.

In addition, the wire connecting jig according to the present invention can standardize the core jig and make the forming part exchangeable, thereby reducing the manufacturing cost.

1 is a schematic view of a secondary battery pack equipped with a jig for wire connection according to the present invention;
2 is a schematic view of a wire connecting jig according to the present invention;
3 is a schematic view of a wire connecting jig equipped with a wire assembly according to the present invention;
3 is a schematic view of a core jig equipped with a wire assembly;
4 is a schematic view of a core jig;
Figure 5 is a side view of Figure 4;
6 is a schematic view of a core jig according to another embodiment of the present invention;
7 is a schematic view of a wire connecting jig equipped with a guide member according to the present invention;
8 is a schematic view of the guide member of Fig.

Hereinafter, the present invention will be described in detail with reference to the drawings, but the scope of the present invention is not limited thereto.

FIG. 1 is a schematic view of a secondary battery pack equipped with a wire connecting jig according to the present invention, and FIG. 2 is a schematic view of a wire connecting jig according to the present invention.

Referring to FIGS. 1 and 2, a secondary battery pack 10 according to the present invention includes a pair of battery cells 110, a BMU 120 for controlling the operation of the secondary battery pack 10, And a circuit board 130 for electrically connecting the circuit board 110 to the outside.

The wire connecting jig 100 for connecting the wire assembly 200 to the circuit board 130 is composed of a main jig 500 and a core jig 300 detachably mounted on the main jig 500, The core jig 300 is configured such that the wire assembly 200 is easily mounted.

The wire assembly 200 is electrically connected to the external input / output terminal 140 on the circuit board 120 by welding. The specific connection method of the wire assembly 200 and the wire connection jig 100 is described below Will be described in detail.

FIG. 3 is a schematic view of a core jig to which a wire assembly is attached, FIG. 4 is a schematic view of the core jig, and FIG. 5 is a schematic view of the side views of FIG.

Referring to these drawings, the wire assembly 200 includes a wire 210 divided into a plurality of strands, and a wire housing 220 surrounding an end of the wire 210.

The core jig 300 is formed with first seating grooves 310 in which the wires 200 are seated and a second seating groove 320 in which the wire housings 220 are seated. Since the first seating grooves 310 are formed in a semi-elliptical shape in section and the second seating grooves 320 are formed in a rectangular shape in cross section, the wire assembly 200 can be easily mounted on the core jig 300 .

6 is a schematic view of a first jig member according to another embodiment of the present invention.

Since the first seating grooves 310 of the first jig member 300 have the same structure as that of the core jig mentioned in FIG. 5 except for the cross-sectional shape of the first seating grooves 310, Is omitted.

FIG. 7 is a schematic view of a wire connecting jig to which a guide member according to the present invention is attached, and FIG. 8 is a schematic view of the guide member of FIG.

1 to 5, a wire connecting jig 100 according to the present invention includes a main jig 500 and a core jig 500 detachably mounted in a mounting groove 510 of the main jig 500. [ And a guide member 600 slidably mounted on the side surface of the core jig 300 to prevent the core jig 300 from swinging and to be easily mounted.

The main jig 500 is formed with a fastening protrusion 530 to be inserted into the fastening groove 610 of the guide member 520 and the guide member 600 so that the guide member 600 is slidably engaged. When the guide member 600 is slidably coupled to the main jig 500, the engaging protrusion 530 of the main jig 500 is inserted into the engaging groove 610 of the guide member 600, Is stably fastened to the main jig (500).

Hereinafter, a process of mounting the wire assembly 200 on the circuit board 130 using the wire connecting jig 100 according to the present invention will be described in detail.

The circuit board 130 is disposed on the main jig 500 and the wire assembly 200 including the plurality of wires 210 branched from the wire housing 220 is connected to the first seating of the core jig 300, And the wires 210 are sequentially aligned with the first seating grooves 310 by being mounted on the grooves 310 and the second seating grooves 320. Then, the core jig 300, on which the wire assembly 200 is mounted, is mounted in the mounting groove 510 of the main jig 500. In this case, the wires 210 are mounted on the main jig 500 to align the aligned wires 210 to the external input / output terminal 140 of the circuit board 130, Electrical connection is made. Finally, the core jig 300 is removed from the main jig 500, so that the connection operation of the wire assembly 200 by the wire connecting jig 100 is terminated.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (17)

An electrode assembly composed of an anode, a cathode and a separator is welded to an external input / output terminal on a circuit board of the secondary battery pack to electrically connect a secondary battery pack including at least one battery cell sealed in the battery case to the outside A jig for wire connection,
A wire assembly including the wires;
A first jig member having at least one seating groove for receiving the wire assembly; And
A second jig member to which the first jig member is mounted;
And,
The first jig member is detachably mounted on the second jig member,
And a guide member mounted on the side surface of the first jig member to prevent the first jig member from swinging,
Wherein the seating grooves of the first jig member include first seating grooves that are branched and segregated with the wires spaced apart from each other by a predetermined distance and second seating grooves that receive wire housings that surround the ends of the wires,
Wherein the first jig member is mounted to the second jig member in a state in which the wires of the wire assembly are seated and aligned in the seating grooves of the first jig member. delete The wire connecting jig according to claim 1, wherein the wire assembly includes a connector housing for connecting the wires. delete delete The jig for wire connection according to claim 1, wherein the second jig member is formed with a guide groove on which the guide member is seated. The jig for wire connection according to claim 1, wherein a fastening groove is formed in the guide member, and a fastening protrusion is formed in the second main jig member at a corresponding portion of the fastening groove. The wire connecting jig according to claim 1, wherein the guide member is slidably coupled to the second jig member. The wire connecting jig according to claim 1, wherein the first jig member is formed by injection molding. 2. The jig for wire connection according to claim 1, wherein the seating groove is formed in a vertical cross-section semi-elliptical shape. The wire connecting jig according to claim 1, wherein the first jig member is made of polyester (PE). The jig for wire connection according to claim 1, wherein the second jig member is aluminum or bakelite. A connection method for connecting a wire to a secondary battery pack using a wire connecting jig according to any one of claims 1, 3, and 12,
(a) placing the wire assembly on the first jig member;
(b) aligning the wires to the seating groove of the first jig member;
(c) mounting the first jig member to the second jig member;
(d) welding the aligned wires onto the circuit board; And
(e) removing the first jig member from the second jig member after welding is completed;
Lt; RTI ID = 0.0 &gt; 1, &lt; / RTI &gt; A secondary battery manufactured by a method of connecting using the wire connecting jig according to claim 13. A battery pack comprising a secondary battery according to claim 14 as a unit cell. A device comprising a battery pack according to claim 15. 17. The method of claim 16, wherein the device is selected from the group consisting of a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid electric vehicle, &Lt; / RTI &gt; device.

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