KR101726765B1 - Circuit Board Having Wire Support Part and Battery Pack With the Same - Google Patents

Abstract

The present invention relates to a circuit board mounted on a battery pack for electrically connecting a battery pack having a structure including one or more battery cells as a unit cell to an external device, Wherein external input terminals to be connected to the circuit board are disposed and wire support portions for fixing at least a part of the wires in the soldering operation are formed at one end portion of the circuit board.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit board having a wire support portion,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board having a wire support portion and a battery pack including the same.

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, an electrolyte, and the like, which are components of a battery, is caused in an abnormal operation state such as overcharging, overdischarge, exposure to a high temperature, an electric short, and the like, thereby generating heat and gas, 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 installed on an anode / separator / cathode electrode assembly (power generation element) built in a cylindrical can, and a rectangular 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 circuit board mounted on a battery pack, which includes support portions for fixing the wires to one side end of the circuit board, thereby simplifying the alignment of the wires, The present invention provides a printed circuit board for a battery pack capable of solving the problem of disordering or twisting so that a separate wire reordering operation is not required, thereby simplifying the operation and improving work productivity.

According to an aspect of the present invention, there is provided a printed circuit board for a battery pack, comprising: a circuit board mounted on the battery pack for electrically connecting a battery pack having a structure including one or more battery cells as a unit cell to an external device; As a substrate,

Wherein external input terminals to which the ends of the wires are connected by soldering are located on the circuit board,

And wire support portions for fixing at least a part of the wires during a soldering operation are formed at one end portion of the circuit board.

Therefore, by including the supports for fixing the wires to one side end of the substrate, it is possible to perform the alignment of the wires easily and solve the problem of disordering or twisting of the wires during the soldering operation, So that it is possible to simplify the work, thereby providing an effect of improving work productivity.

As described above, the electrical connection work for connecting the battery pack to the external power device is performed through wires. Specifically, the wire is composed of a conductive body and an insulating coating layer of an insulating polymer resin surrounding the outer surface of the conductive body And an end portion connected to the external input terminal by soldering may be configured such that the conductive body is exposed.

When the wire having such a structure is electrically connected to the circuit board for a battery pack of the present invention, at least a part of the remaining portions of the wire other than the end where the conductive body is exposed may be fixed by the wire support.

At this time, the length of the wire fixed by the wire support portion may be within the range of 0.1 cm to 5 cm, and if the length of the wire fixed by the support portion is too long, the support portion of the circuit board is also undesirably long, The wire can not be stably supported, which is not preferable.

In one specific example, the wire supports may have a structure in which one wire is supported by one wire support portion, and the wire support portions are arranged at equal intervals corresponding to the number of wires.

The wire support portion is not limited as long as the insulation coating layer of the wires can be fixed in an aligned state. For example, the wire support portion may have a rectangular shape corresponding to the number of wires, have.

Specifically, the wire support structure may be a slit structure penetrating the circuit board, and may be a groove structure indented from the surface of the circuit board.

The insulating coating layer of the wire may be at least partly inserted into the slit or groove of the wire supporting part and at least a part of the insulating coating layer may be elastically pressed and inserted into the slit or groove of the supporting part.

The width of the wire support portion is formed to be 60 to 95% of the outer diameter of the wire for the purpose of partially inserting the insulating coating layer of the wire or for inserting at least a part of the insulating coating layer while being elastically pressed desirable.

In general, the circuit board uses a printed circuit board (PCB) on which a circuit is printed on a board of an electrically insulating material. The board end of the electrically insulating material is partially cut or cut into a desired size to form a wire support It is possible to do.

Meanwhile, the battery cell may be a plate-shaped battery cell, and the plate-shaped battery cell may be a prismatic secondary battery or a pouch-type secondary battery.

For reference, the battery cell may be a lithium secondary battery, and the lithium secondary battery includes a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte solution 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 < 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, etc. 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 further provides a battery pack in which the circuit board for a battery pack is mounted and a device using the battery pack as a power source, wherein the device is a smart phone, a mobile phone, a notebook, a tablet PC, Electronic devices, electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles or systems for power storage.

The structure of the battery pack and the diabis and the manufacturing method thereof are well known in the art, so a detailed description thereof will be omitted herein.

As described above, the circuit board for a battery pack according to the present invention includes the support parts for fixing the wires to one end of the rotating substrate, so that the alignment of the wires can be easily performed, Eliminating the problem of disordering or twisting, eliminating the need for a separate wire reordering operation, thereby simplifying the work and improving work productivity.

1 is a schematic diagram of a circuit board on which a wire is mounted according to one embodiment of the present invention;
Figure 2 is a first side view of Figure 1;
Figure 3 is a second side view of Figure 1;
4 is a first side view of a wire-mounted circuit board according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

Fig. 1 is a schematic view of a circuit board on which a wire is mounted according to one embodiment of the present invention.

Referring to FIG. 1, a circuit board 100 of the present invention includes a battery pack (not shown) having a structure including one or more battery cells as a unit battery, The external input terminals 111, 112, 113 and 114 are connected to the circuit board 100 by soldering and the wires 100 are connected to the circuit board 100 at the side of the circuit board 100, A plurality of wire supporting portions 120 are formed on which a part of the wire supporting portions 201, 202, 203, and 204 are fixed.

Each of the wires 201, 202, 203 and 204 includes a conductive body 210 and an insulating coating layer 220 of an insulating polymer resin surrounding the outer surface of the conductive body 210. The wires 201, 203 and 204 are formed such that the conductive main body 210 is exposed so as to be connected to the external input terminals 111, 112, 113 and 114 by soldering.

The wire supports 120 are spaced apart at equal intervals corresponding to the number of the wires 201, 202, 203, 204 in a structure in which one wire 201 is supported by one wire support 120 202, 203 and 204 are arranged in only a part of the wire supports 120 as necessary and the wires 201, 202, 203 and 204 are arranged in the wire supports 120, The conductive bodies 210 are soldered to the external input terminals 111, 112, 113, and 114 to electrically connect the battery pack to the external device.

The circuit board 100 having such a structure includes the wire supports 120 for fixing the wires 201, 202, 203 and 204 to one end of the circuit board 100, 202, 203 and 204 can be easily performed and the problem of disordering or twisting of the wires 201, 202, 203 and 204 during the soldering operation can be solved, This simplifies the task and provides an effect of improving work productivity.

Fig. 2 shows a first side view of Fig. 1, and Fig. 3 schematically shows a second side view of Fig.

Referring to FIGS. 2 and 3, with reference to FIG. 1, the wire supporting portions 120 are formed in a slit structure passing through the circuit board 100, and the slits of the wire supporting portions 120 And the insulating coating layer 220 of the wires 201, 202, 203 and 204 is partially inserted into the insulating coating layer 220.

At this time, the width of the wire supporting parts 120 is 80% of the outer diameter of the insulating coating layer 220 of the wires 201, 202, 203 and 204, and the insulating coating layer 220 having a certain level of elasticity, Is inserted into the slit while being elastically pressed.

A part of the insulating coating layer 220 is inserted into the wire supporting part 120 in such a manner that the length L of the wire 201 fixed by the wire supporting part 120 is aligned in the range of 1 cm, And soldering is performed in a state where the conductive main body 210 is positioned on the external input terminal 111 to be electrically connected.

4 schematically shows a first side view of a circuit board on which a wire is mounted according to another embodiment of the present invention.

Referring to FIG. 4, the wire supports 320 are formed of a groove structure indented from the surface of the circuit board 300 on the basis of the first side, and wires 401 (not shown) are formed on the grooves of the wire supports 320. , 402, 403, and 404 are partially inserted into the insulating coating layer 420.

Although the groove structure of the wire supports 320 of FIG. 4 is shown as being embossed to a size corresponding to the outer diameter of the wires 401, 402, 403, 404, the groove width of the supports 320 And a portion of the wires 401, 402, 403, 404 are resiliently deformed to a size of 60 to 95% with respect to the outer diameter or width of the wires 401, 402, 403, It is a matter of course that it can be a structure in which it is arranged in the form of being inserted on the groove while being pressurized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (18)

1. A circuit board mounted on a battery pack for electrically connecting a battery pack having a structure including one or more battery cells as a unit cell to an external device,
Wherein external input terminals to which the ends of the wires are connected by soldering are located on the circuit board,
Wire support portions are formed at one end portion of the circuit board to fix at least a part of the wires during soldering operation,
Wherein the wire is composed of a conductive body and an insulating coating layer of an insulating polymer resin surrounding the outer surface of the conductive body, and the end portion connected to the external input terminal by soldering has a structure in which the conductive body is exposed,
At least a part of the remaining portions of the wire except for the end where the conductive body is exposed is fixed by the wire supporting portion,
Wherein the wire support portion is formed in a slit structure passing through the circuit board and is positioned in parallel with the external input terminals in the horizontal direction,
The insulating coating layer of the wire is at least partly inserted and fixed on the slit of the wire supporting portion,
Wherein at least a part of the insulating coating layer is elastically pressed and inserted on the slit of the supporting portion. delete delete The circuit board for a battery pack according to claim 1, wherein the length of the wire fixed by the wire support is in the range of 0.1 cm to 5 cm. The circuit board for a battery pack according to claim 1, wherein the wire supports are structured such that one wire is supported by one wire support portion, and are arranged at equal intervals corresponding to the number of wires. The circuit board for a battery pack according to claim 1, wherein the wire support portion is rectangular in plan view. delete delete delete delete The circuit board for a battery pack according to claim 1, wherein the width of the wire support portion is 60 to 95% of the outer diameter of the wire. The circuit board for a battery pack according to claim 1, wherein the circuit board is a printed circuit board (PCB) on which a circuit is printed on a board of an electrically insulating material. The circuit board for a battery pack according to claim 1, wherein the battery cell is a plate-shaped battery cell. The circuit board for a battery pack according to claim 13, wherein the plate-shaped battery cell is a prismatic secondary battery or a pouch-type secondary battery. The circuit board for a battery pack according to claim 1, wherein the battery cell is a lithium secondary battery. A battery pack according to claim 1, wherein the circuit board for a battery pack A device comprising a battery pack according to claim 1. 18. The device of claim 17, wherein the device is selected from a smart phone, a mobile phone, a notebook, a tablet PC, a wearable electronic device, an electric vehicle, a hybrid electric vehicle, a plug- .

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