KR102082387B1 - Battery Pack Including Static Guide Member - Google Patents

Abstract

The present invention provides two or more battery cells that are electrically connected; A battery management unit (BMU) positioned at one side of the battery cells and electrically connected to the battery cells to control charge and discharge of the battery cells; A pack case accommodating the battery cells and the BMU therein; The BMU includes a printed circuit board (PCB) and a connector, and two electrostatic induction members are mounted on an upper portion of the printed circuit board and spaced apart from each other. Induction members provide a battery pack, characterized in that electrically connected to the connector or the battery cell.

Description

Battery Pack Including Static Induction Member {Battery Pack Including Static Guide Member}

The present invention relates to a battery pack including an electrostatic induction member.

Technological advancements in mobile devices have led to the provision of notebook computers capable of comparable performance to desktop computers. Recently, the demand for notebook computers is very high.

A notebook computer is the biggest advantage that it is convenient to carry compared to a conventional desktop computer, and one of the most important role to enable such a portable battery pack is an energy source of the notebook computer.

In general, a battery pack of a notebook computer is composed of a plurality of unit battery cells, a battery management unit (BMU) that controls the charging and discharging of the battery cells and a battery pack case therein, and a secondary battery used in a device such as a notebook computer. As a battery, a cylindrical battery cell of a high output large capacity is mainly used.

In order to prevent such a battery pack from interfering with and damaging the BMU by static electricity applied from the outside of the battery pack, an electrostatic discharge (ESD) design for preventing static electricity in a connector connected to the BMU has been studied.

However, studies to prevent static electricity from the battery pack case is insufficient. In particular, the static electricity flowing from the gap formed in the fastening portion or the joint of the case of the battery pack causes interference and damage to the protection circuit module formed in the BMU, thereby preventing the normal operation of the battery pack.

Accordingly, a battery pack that can solve the above problems is very necessary.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

An object of the present invention is to provide a battery pack capable of ensuring the stability of the operation of the battery by preventing the protection circuit module that controls the charging and discharging of the battery from the static electricity applied from the outside of the battery pack to prevent interference and damage.

Battery pack according to the present invention for achieving this object,

Two or more battery cells that are electrically connected;

A battery management unit (BMU) positioned at one side of the battery cells and electrically connected to the battery cells to control charge and discharge of the battery cells; And

A pack case accommodating the battery cells and the BMU therein;

It may include,

The BMU includes a printed circuit board (PCB) and a connector.

Two electrostatic induction members may be spaced apart from each other, and the electrostatic induction members may be configured to be electrically connected to a connector or a battery cell.

Accordingly, in the battery pack according to the present invention, two electrostatic induction members are mounted on the printed circuit board and spaced apart from each other, and the electrostatic induction members are electrically connected to the connector or the battery cell, thereby being applied from the outside of the battery pack. The protection circuit module or the safety device that controls the charging and discharging of the battery from static electricity can be prevented from being interfered with and damaged to ensure the stability of the battery operation.

In one embodiment of the present invention, the battery cell may be a cylindrical battery cell. The cylindrical battery cell may have a structure in which a jelly-roll type electrode assembly is accommodated in a cylindrical case and an electrolyte is injected into the cylindrical case, and then a top cap having an electrode terminal formed on an open upper end of the cylindrical case is combined. .

As a specific embodiment, the battery cells may be arranged in the longitudinal direction of the battery cells to form a series connection. The battery cells are arranged in parallel with the electrode terminals facing the same direction in a state where two or more battery cells are in contact with the side, and the two or more battery cells connected in parallel in the longitudinal direction to the parallel connected battery cells By connecting the battery cell assembly can be configured. For example, the battery cell assembly may be composed of a connection structure of 1P-4S or 2P-3S, and may be composed of battery cell assemblies of various standards according to the capacity and output required by the device on which the battery pack is mounted. Can be.

The outer electrode terminals of the battery cells positioned at both outermost sides of the battery cells may be electrically connected to the BMU by a bus bar. The battery cells positioned at one outermost side of the battery cells may form a positive electrode terminal, and the battery cells positioned at the outermost side of the battery cells may form a negative electrode terminal. The positive terminal and the negative terminal may be electrically connected to the BMU by respective bus bars.

Specifically, the bus bar may be bent in the direction of the BMU from the end of the outermost battery cell, it may be made of a structure extending to the BMU along the outer surface of the arranged battery cells. The bus bar may be configured to extend to the BMU along the outer surface in contact with the side surfaces of the battery cells.

In one embodiment of the present invention, the pack case may be composed of a first case and a second case.

The first case may include a storage unit for accommodating the battery cells and the BMU, and a cover covering the battery cells and the BMU and the second case while the second case is mounted on the battery cells. .

The accommodating part may be formed to correspond to the battery cells and the BMU, and may include a battery cell accommodating part accommodating the battery cells and a BMU accommodating part accommodating the BMU, and the cover has an inner surface thereof. It may be made of a shape corresponding to the case.

The electrostatic induction member may be mounted at a position corresponding to a portion where the accommodating portion and the cover meet on the printed circuit board so as to induce static electricity flowing from the outside of the battery pack.

The accommodating part and the cover may be connected in a hinge structure, and thus the cover may be easily opened and closed with respect to the accommodating part.

A connector opening may be formed at a portion of the housing corresponding to the connector of the BMU so that the connector is exposed. The connector opening may have a shape corresponding to an outer circumferential surface of the connector.

The second case may be formed in a shape corresponding to the upper outer surface of the arranged battery cells, one or more heat dissipation openings in the longitudinal direction on the outer surface of the second case to dissipate heat generated from the battery cells May be formed.

In one embodiment of the present invention, the PCB may be formed in a rectangular shape on the plane, the electrostatic induction members may be mounted on both sides of the upper side of the PCB, respectively, the protection circuit module and / or safety of the PCB The elements may be located underneath the static induction members.

One of the electrostatic induction members may be electrically connected to the connector, and the other may be electrically connected to the battery cell.

In another embodiment, each of the electrostatic induction members may be electrically connected to a connector.

In another embodiment, each of the electrostatic induction members may be electrically connected to the battery cell.

When the electrostatic induction members are electrically connected to either the connector or the battery cell, the electrostatic induction members may induce static electricity introduced into the battery pack to the connector or the battery cell. Accordingly, even if static electricity flows along the gap between the fastening portion or the joint of the pack case from the outside of the battery pack, the static electricity is induced by the electrostatic inducing member to the connector or the battery cell, thereby protecting or protecting the PCB. It may not cause interference or damage to the circuit module.

The connector may include an electrostatic discharge (ESD) element to remove static electricity induced from the static induction member.

The electrostatic induction members may be made of a metal material. Specifically, the electrostatic induction members may be a copper (Cu) or aluminum (Al) metal, but a metal material capable of inducing static electricity to a connector or a battery cell. If it is not limited to this.

The battery cell may be a lithium secondary battery, and specifically, may be a lithium ion battery or a lithium ion polymer battery.

In general, a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a lithium salt-containing nonaqueous electrolyte.

The positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector, followed by drying, and optionally, a filler is further added to the mixture.

The positive electrode 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 , Cu ₂ V ₂ O ₇ and the like; Ni-site-type lithium nickel oxide represented by the formula LiNi _1-x M _x O ₂ , wherein 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 , wherein M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1, or Li ₂ Mn ₃ MO ₈ , where M = Fe, Co, Lithium manganese composite oxide represented by Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with alkaline earth metal ions; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ and the like, but are not limited to these.

The conductive material is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. The conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery. Examples of the conductive material include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys 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 that assists in bonding the active material and the conductive material to the current collector, and is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, 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 inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery. Examples of the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.

The negative electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector, and optionally, the components as described above may be further included if necessary.

As said negative electrode active material, For example, carbon, such as hardly graphitized carbon and graphite type 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 ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; 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 metal oxides such as Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separator 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 from 0.01 to 10 ㎛ ㎛, thickness is generally 5 ~ 300 ㎛. As such a separator, for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets made of glass fibers or polyethylene, nonwoven fabrics, and the like are used. When a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.

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

As said non-aqueous liquid electrolyte, For example, N-methyl- 2-pyrrolidinone, a propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be used.

Examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating groups and the like can be used.

Examples of the inorganic solid electrolytes 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, sulfates and the like of Li, such as Li ₄ SiO ₄ -LiI-LiOH, Li ₃ PO ₄ -Li ₂ S-SiS ₂ , and the like, may be used.

The lithium salt is a good material to be dissolved 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.

In addition, for the purpose of improving charge / discharge characteristics, flame retardancy, etc., the non-aqueous electrolyte solution includes, for example, pyridine, triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, and hexaphosphate triamide. Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride, etc. It may be. In some cases, in order to impart nonflammability, halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics.

The present invention also provides a device including the battery pack as a power source.

The device may be selected from mobile phones, wearable electronics, portable computers, smart pads, netbooks, light electronic vehicles (LEVs), electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage devices.

Since the structure of these devices and their fabrication methods are known in the art, detailed descriptions thereof are omitted herein.

As described above, the battery pack according to the present invention, the two electrostatic induction members are mounted on the printed circuit board spaced apart from each other and the electrostatic induction members are electrically connected to the connector or the battery cell, The protection circuit module or the safety device that controls the charging and discharging of the battery from static electricity applied from the outside can be prevented from being interfered with and damaged to ensure the stability of the battery operation.

1 is a perspective view of a battery pack according to an embodiment of the present invention;
2 is an exploded view of the battery pack of FIG. 1;
3 is a plan view of the printed circuit board of FIG. 1.
4 is an exploded view of a battery pack according to another embodiment of the present invention;
5 is an exploded view of a battery pack according to another embodiment of the present invention.

Hereinafter, although described with reference to the drawings according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

1 is a perspective view schematically showing a battery pack according to an embodiment of the present invention, Figure 2 is an exploded view of the battery pack of Figure 1 schematically, Figure 3 is a printed circuit of Figure 1 A plan view of the substrate is schematically shown.

1 to 3, the battery pack 100 includes battery cells 200, a BMU 300, and a pack case 400.

The battery cells 200 are formed of a cylindrical battery cell, the battery cells 200 are arranged in the longitudinal direction of the battery cells are connected in series. The outer electrode terminal of the leftmost battery cell 210 is composed of a positive electrode terminal 211 and is electrically connected to the BMU 300 by the bus bar 500, the rightmost of the battery cell 230 The outer electrode terminal is composed of a cathode terminal 231 and is electrically connected to the BMU 300 by the bus bar 500.

The bus bar 500 is bent in the direction of the BMU 300 from the ends of the outermost battery cells 210 and 230, and extends to the BMU 300 along the outer surface of the arranged battery cells 200. Consists of

The BMU 300 is located on the side of the battery cells 220 in the middle of the battery cells 200, and is electrically connected to the battery cells 200 to control charge and discharge of the battery cells 200.

The BMU 300 includes a printed circuit board 310 and a connector 320.

The printed circuit board 310 has a rectangular shape on a plane, and electrostatic induction members 330 are mounted at both sides of an upper end of the printed circuit board 310, and the electrostatic induction members 330 are connected to the connector 320. Is electrically connected, and a protective circuit module (not shown) and / or safety elements (not shown) of the printed circuit board 310 are positioned under the electrostatic induction member 330.

The pack case 400 includes a first case 410 and a second case 420.

The first case 410 is an accommodating part 411 in which the battery cells 200 and the BMU 300 are accommodated, and the battery cell in a state in which the second case 420 is mounted on the battery cells 200. And a cover 412 having a structure covering the field 200 and the BMU 300 and the second case 200.

The housing 410 and the cover 412 are connected in a hinged structure.

A connector opening 413 is formed at a portion of the housing 411 of the first case 410 corresponding to the connector 320 of the BMU 300 so that the connector 320 may be exposed.

The second case 420 is formed in a shape corresponding to the upper outer surface of the arranged battery cells 200, the outer surface of the second case 420 so as to release the heat generated from the battery cells 200 The heat dissipation openings 421 are formed in the longitudinal direction.

The cover 412 of the first case 410 is a state in which the battery cells 200 and the BMU 300 are embedded in the storage unit 411 and the second case 420 is covered on the battery cells 200. In the direction of the receiving portion 411, the cover is fastened to the receiving portion 410.

By the above structure, even if the static electricity flows along the gap between the fastening portion or the joint of the pack case 400 from the outside of the battery pack 100, the introduced static electricity is the connector 320 by the electrostatic induction member 330 ) May not cause interference or damage to the safety element (not shown) or the protection circuit module (not shown) of the printed circuit board 310.

The connector 320 includes an ESD device (not shown) to remove static electricity induced from the static electricity inducing member 330.

4 is an exploded view schematically showing a battery pack according to another embodiment of the present invention.

Referring to FIG. 4, the printed circuit board 610 has a quadrangular shape in plan view, and electrostatic induction members 630 are mounted on both sides of an upper end of the printed circuit board 610, and the electrostatic induction members ( 630 is electrically connected to the battery cells 200 via a bus bar 500, and a protection circuit module (not shown) and / or safety elements (not shown) of the printed circuit board 610 may be provided. It is located under the electrostatic induction member 630.

Except for the structure in which the electrostatic induction members 630 are electrically connected to the battery cells 200 through the bus bar 500, the rest of the structures are the same as those described with reference to FIGS. It will be omitted.

5 is an exploded view schematically showing a battery pack according to another embodiment of the present invention.

Referring to FIG. 5, the printed circuit board 710 has a quadrangular shape on a plane, and electrostatic induction members 731 and 732 are mounted on both sides of an upper end of the printed circuit board 710, and a left electrostatic induction The member 731 is electrically connected to the battery cells 200 through the bus bar 500, the right electrostatic induction member 732 is electrically connected through the connector 720, and the printed circuit board 710. A protection circuit module (not shown) and / or safety elements (not shown) of are located under the electrostatic induction members 731 and 732.

Except for the structure in which the electrostatic induction members 731 and 732 are electrically connected to the battery cells 200 through the bus bar 500, the rest of the structures are the same as those described with reference to FIGS. 1 to 3. The description will be omitted.

Although described above with reference to the drawings according to an embodiment of the present invention, those skilled in the art will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

Claims (21)

Two or more battery cells that are electrically connected;
Located on one side of the battery cells, and electrically connected to the battery cells to control the charging and discharging of the battery cells, a connector including a printed circuit board (PCB) and electrostatic discharge (ESD) element Battery Management Unit (BMU) including;
A pack case having a first case and a second case, the pack case accommodating the battery cells and the BMU therein; And
Electrostatic induction members mounted on both sides of an upper end of the printed circuit board;
It is configured to include,
The first case may include a housing configured to accommodate the battery cells and the BMU, and a cover covering the battery cells and the BMU and the second case while the second case is mounted on the battery cells. Features,
The electrostatic induction member is mounted at a position corresponding to a portion where the accommodating portion and the cover meet each other, and among the electrostatic induction members mounted at both sides, the left electrostatic induction member mounted at the left side is electrically connected to the battery cells. The right electrostatic induction member connected to the right side is electrically connected to the connector, and discharges static electricity introduced from the outside of the battery pack along the gap between the fastening part or the joint of the pack case to the battery cells and the connector. Battery pack, characterized in that to be. The method of claim 1, wherein the battery cell is a battery pack, characterized in that the cylindrical battery cell. The battery pack as claimed in claim 1, wherein the battery cells are arranged in a length direction of the battery cells to form a series connection. The battery pack as claimed in claim 3, wherein outer electrode terminals of battery cells positioned at both outermost sides of the battery cells are electrically connected to the BMU by a bus bar. The battery pack as claimed in claim 4, wherein the bus bar is bent in an BMU direction from an end of the outermost battery cell and extends to the BMU along the outer surfaces of the arranged battery cells. delete delete delete The battery pack as claimed in claim 1, wherein the accommodating portion and the cover are connected in a hinge structure. The battery pack according to claim 1, wherein an opening for a connector is formed at a portion of the housing corresponding to the connector of the BMU so that the connector can be exposed. According to claim 1, wherein the second case is formed in a shape corresponding to the upper outer surface of the arranged battery cells, one in the longitudinal direction on the outer surface of the second case so as to dissipate heat generated from the battery cells The above-mentioned heat dissipation opening is formed, The battery pack characterized by the above-mentioned. The method of claim 1, wherein the PCB has a rectangular shape on a plane, the electrostatic induction members are mounted on both sides of the top of the PCB, respectively, characterized in that the safety elements of the PCB are located below the electrostatic induction members Battery pack to say. delete delete delete delete The battery pack as claimed in claim 1, wherein the electrostatic induction members are made of a metallic material. The method of claim 17, wherein the electrostatic induction member is a battery pack, characterized in that the copper (Cu) or aluminum (Al) -based metal. The battery pack as claimed in claim 1, wherein the battery cell is a lithium secondary battery. A device comprising the battery pack according to claim 1 as a power source. 21. The device of claim 20, wherein the device is selected from mobile phones, wearable electronics, portable computers, smart pads, netbooks, light electronic vehicles (LEVs), electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage devices. Device characterized in that the.

Images