KR102092114B1 - Battery Pack Having Battery Cells Integrally Formed in Perpendicular Array - Google Patents

Abstract

The present invention is an electrode assembly is sealed in the interior of the battery case with the electrolyte, two battery cells are formed with electrode terminals at one end; A protection circuit comprising a printed circuit board (PCB) having a protection circuit for controlling voltage and current of charging and discharging, and terminal connections formed on one surface of the PCB so that the electrode terminals of the battery cells are electrically connected. Module (PCM); and the battery cells are arranged in a direction perpendicular to each other with the electrode terminals spaced apart from each other with the PCM interposed therebetween, and the battery cells and the PCM have an entire outer surface for insert injection molding. It provides a battery pack characterized in that it is coated with a resin.

Description

Battery pack having battery cells integrally formed by orthogonal orientation {Battery Pack Having Battery Cells Integrally Formed in Perpendicular Array}

The present invention relates to a battery pack having a structure in which battery cells are integrally formed by orthogonal orientation.

In recent years, as technology development and demand for mobile devices have increased, the demand for secondary batteries capable of charging and discharging as an energy source has rapidly increased, and accordingly, many studies have been conducted on secondary batteries capable of meeting various demands. In addition, the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle, which has been proposed as a solution to air pollution, such as existing gasoline vehicles and diesel vehicles using fossil fuels. It is also attracting attention as a power source such as (Plug-In HEV).

These secondary batteries are classified into lithium ion batteries, lithium ion polymer batteries, and lithium polymer batteries, depending on the configuration of the electrode and electrolyte, among which the possibility of leakage of the electrolyte is low, and the usage of the lithium ion polymer battery which is easy to manufacture is Is increasing.

In general, the secondary battery, depending on the shape of the battery case, the electrode assembly is a cylindrical battery or a rectangular battery embedded in a metal can of a cylindrical or square, and the electrode assembly is a pouch-shaped battery embedded in a pouch-shaped case of an aluminum laminate sheet It is classified as.

The secondary battery is composed of a battery module or a battery pack by connecting a plurality of battery cells according to the capacity required in the device on which the battery is mounted. Since the secondary battery may cause abnormal operation of the battery due to over-charging, over-discharging, or over-current as charging and discharging are repeated, a plurality of battery cells are connected to a protection circuit module having a protection circuit to control charging and discharging of the battery. Is done.

In addition, the arrangement and fastening structure of the battery cells and the protection circuit module may be limited according to the shape of the battery storage space of the secondary battery.

Accordingly, the battery module or battery pack as described above is structurally unstable because a plurality of battery cells and a protection circuit module are connected in a limited space. Conventionally, in order to solve such structural instability, a frame having a shape corresponding to the battery cells and the protection circuit module is formed, and a label and a sheet are attached to the outer surface while the battery cells and the protection circuit module are mounted on the frame. By doing so, the structural stability of the battery module or battery pack was sought.

However, such a battery module or battery pack structure, the structure of the frame must be changed according to the shape of the device on which the battery is mounted, and the process of separately manufacturing the frame and the process of separately attaching labels and sheets are added, so the battery module Or, it increases the overall manufacturing process time of the battery pack, and is a major cause of increasing manufacturing cost.

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

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

Specifically, the object of the present invention, it is possible to flexibly arrange the battery cells corresponding to the battery storage space of the device on which the battery is mounted, and the process for stably combining the battery cells and the protection circuit module is quick and easy It is performed to provide a battery pack capable of reducing manufacturing time and cost.

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

Two battery cells in which the electrode assembly is sealed inside the battery case together with the electrolyte and electrode terminals are formed at one end;

A protection circuit comprising a printed circuit board (PCB) having a protection circuit for controlling voltage and current of charging and discharging, and terminal connections formed on one surface of the PCB so that the electrode terminals of the battery cells are electrically connected. Module (PCM);

It may include,

The battery cells may be arranged in a direction in which the electrode terminals are orthogonal to each other with the PCM spaced apart from each other.

The entire surface of the battery cells and PCM may be covered with resin by insert injection molding.

Therefore, in the battery pack according to the present invention, the battery cells are arranged in a direction perpendicular to each other with the electrode terminals spaced apart from each other with the PCM interposed therebetween, and the battery cells and the PCM have an entire outer surface made of resin by insert injection molding. By being coated with, it is possible to flexibly arrange battery cells corresponding to the battery storage space of the device on which the battery is mounted, and the process for stably combining the battery cells and the protection circuit module is performed quickly and easily. It is possible to save time and cost, and it is possible to achieve a lightweight and compact structure of the battery pack by resin coating.

In one embodiment of the present invention, the battery cells may be composed of a rectangular first battery cell and a second battery cell, respectively, in a plane, and the PCM may be formed in a square shape in a plane. The shape of the battery cells and PCM may be changed to various shapes according to the battery storage space of the device on which the battery pack is mounted.

In one specific embodiment of the invention,

In the first battery cell, in a state where the side where the electrode terminals are formed is in contact with the first side of the PCM, the electrode terminals may be connected to and connected to the terminal connection portion of the PCM,

In the second battery cell, in a state where one side is in contact with the second side opposite to the first side of the PCM, the side where the electrode terminals are formed is collinear with the third side respectively contacting the first side and the second side of the PCM. Located in the, the electrode terminals may be connected in contact with the terminal connection portion formed on the third side extending in the third side direction of the PCM.

A first terminal connection portion corresponding to electrode terminals of the first battery cell may be formed on a first side of the PCM, and electrically connected to electrode terminals of the second battery cell on a third side of the PCM. The second terminal connecting portions may be formed.

The first side and the second side of the PCM may be formed as long sides relative to the third side.

In one example of a specific connection structure between the electrode terminal of the second battery cell and the terminal connection portion of the PCM,

The electrode terminal of the second battery cell,

A terminal portion protruding from the battery cell;

An extension connecting portion extending from the terminal portion in the third side direction of the PCM in a state orthogonal to the protruding direction of the terminal portion; And

A contact connection portion extending from the extension connection portion toward the PCM and connected to the terminal connection portion;

It may contain.

The electrode terminals of the second battery cell may be composed of a positive electrode terminal and a negative electrode terminal, and to prevent short circuits that may occur due to contact between the positive terminal and the extended connection portions of the negative electrode terminal, the positive electrode terminal and the negative electrode terminal respectively. An insulating member may be interposed between the extension connections.

In another embodiment of the present invention, a connector may be formed in a protruding shape on a fourth side that the battery cells do not contact in the PCM. The connector may be configured to have a structure in which a connector is coupled to an end of a wire extending from a PCM so as to be able to flexibly determine a connection position of the connector so that it can be electrically connected to the inside of the device on which the battery pack is mounted. .

In another embodiment of the present invention, in the battery pack, the entire outer surface of the battery cells and the PCM except the connector may be coated with resin by insert injection molding.

In one embodiment of the present invention, the first battery cell and the second battery cell is a battery pack, characterized in that the side of the electrode terminals are formed in a rectangular shape having a relatively short length on the plane.

In one embodiment of the present invention, the lengths of the first side and the second side of the PCM may be formed to be the same as the length of the side where the electrode terminals of the first battery cell are respectively formed.

In addition, the length of the second side of the PCM may be formed in a structure relatively shorter than the length of one side of the second battery cell in contact with the second side.

As a specific example of the resin, the resin may be rubber or plastic, but is not limited if the outer surfaces of the battery cells and the PCM can be covered by insert injection molding.

In one embodiment of the present invention, the battery cell may be a pouch-shaped battery or a square battery.

The pouch-type battery may have a structure in which an electrode assembly having a separator structure interposed between an anode, a cathode, and an anode and a cathode is embedded and sealed together with an electrolyte in a battery case made of a laminate sheet.

The electrode assembly may be of a folding type structure, or a stack type structure, or a stack / folding type structure, or a lamination / stack type structure.

The electrode structures of the folding type, the stack type, the stack / folding type, and the lamination / stack type are as follows.

First, the unit cell of the folding-type structure can be prepared by coating a mixture containing an electrode active material on each metal current collector, and then placing a separator sheet between the positive electrode and the negative electrode in the form of dried and pressed sheets, and winding them. .

The unit cell of the stacked structure is coated with an electrode mixture on each metal current collector, dried and pressed, and then, between the positive electrode plate and the negative electrode plate cut out in a predetermined size, a separator cut in a predetermined size corresponding to the positive electrode plate and negative electrode plate. It can be manufactured by laminating after interposing.

The unit cell of the stacked / folded structure has a structure in which an anode and a cathode face each other, and includes two or more unit cells in which two or more electrode plates are stacked, and the unit cells are wound with one or more separation films in a non-overlapping form, Or it can be produced by bending the separation film to the size of the unit cell and interposed between the unit cells.

In some cases, the anode and the cathode face each other, and one or more single electrode plates may be additionally included between arbitrary unit cells and / or on the outer surface of the outermost unicell.

The unit cell may be an S-type unit cell in which the outermost pole plates of both sides have the same electrode, and a D-type unit cell in which the outermost pole plates of both sides have the opposite electrode.

The S-type unit cell may be an SC-type unit cell in which the outermost pole plates on both sides are anodes and an SA-type unit cell in which the outermost pole plates on both sides are cathodes.

The unit cell of the lamination / stack type structure is coated with an electrode mixture on each metal current collector, dried and pressed, cut into a predetermined size, and sequentially from the bottom to the cathode, the separator to the top of the cathode, and the anode, and A separator can be stacked on top of it.

As one specific example of the battery case, the battery case is composed of a laminate sheet including an outer resin layer having excellent durability, a barrier metal layer, and a heat-sealable resin sealant layer, and the resin sealant layers are heat-sealed to each other. You can.

Since the outer layer of the resin must have excellent resistance from the external environment, it is necessary to have a tensile strength and weather resistance of a predetermined or more. In such a side, polyethylene terephthalate (PET) and a stretched nylon film may be preferably used as the polymer resin of the outer resin layer.

The barrier metal layer may preferably be made of aluminum so as to exhibit a function of improving the strength of the battery case in addition to the function of preventing the inflow or leakage of foreign substances such as gas and moisture.

The resin sealant layer has a heat sealability (thermal adhesiveness), low hygroscopicity to suppress the intrusion of the electrolyte, and a polyolefin-based resin that is not expanded or eroded by the electrolyte can be preferably used. Preferably unstretched polypropylene (CPP) can be used.

The prismatic battery may include a structure in which an electrode assembly is embedded in a battery case of a metal can structure together with an electrolyte, and an electrode terminal is formed on the top of the metal can.

In one specific example, the type of the battery cell is not particularly limited, but as a specific example, a lithium secondary battery such as a lithium ion battery, a lithium ion polymer battery, or the like having advantages such as high energy density, discharge voltage, and output stability. It can be a battery.

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

The positive electrode is prepared by, for example, coating a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector, followed by drying, and if necessary, further adding a filler to the mixture.

The positive electrode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ) or lithium nickel oxide (LiNiO ₂ ) or a compound substituted with one or more transition metals; Lithium manganese oxides such as the formula Li _{1 + x} Mn _2-x O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ ; 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 represented 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, Zn or Ta, 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 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 usually added in 1 to 30% by weight based on the total weight of the mixture containing the positive electrode active material. The conductive material is not particularly limited as long as it has conductivity without causing a chemical change 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 fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder, 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 may be used.

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

The filler is optionally used as a component that inhibits the expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical changes in the battery, and includes, for example, an olefinic polymer 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 current collector, and if necessary, components as described above may be optionally further included.

Examples of the negative electrode active material include carbons such as non-graphitized carbon and graphite-based 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' : Al, B, P, Si, group 1, group 2, group 3 elements of the periodic table, halogen; metal composite oxides such as 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 Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni based materials and the like can be used.

The separator and the separation film are 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 μm, and the thickness is generally 5 to 130 μm. Examples of the separator include olefin-based polymers such as polypropylene, which are chemically resistant and hydrophobic; Sheets or non-woven fabrics made of glass fiber or polyethylene are used. When a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.

Further, in one specific example, in order to improve the safety of the battery, the separator and / or the separator film may be an organic / inorganic composite porous safety-reinforcing separator (SRS) separator.

The SRS separator is manufactured by using inorganic particles and a binder polymer as an active layer component on a polyolefin-based separator substrate, wherein the pore structure included in the separator substrate itself and the interstitial volume between the inorganic particles as an active layer component are used. It has a uniform pore structure formed.

When using the organic / inorganic composite porous separator, there is an advantage that the increase in battery thickness due to swelling during chemical conversion (Formation) can be suppressed compared to the case where a conventional separator is used. When a gelable polymer is used when impregnating a liquid electrolyte, it can be used simultaneously as an electrolyte.

In addition, since the organic / inorganic composite porous separator can exhibit excellent adhesion properties by controlling the content of the inorganic particles and the binder polymer, which are the active layer components in the separator, the battery assembly process can be easily performed.

The inorganic particles are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles that can be used in the present invention are not particularly limited as long as there is no oxidation and / or reduction reaction in the operating voltage range of the applied battery (for example, 0 to 5 V based on Li / Li +). In particular, in the case of using the inorganic particles having the ion transport ability, it is preferable to increase the ion conductivity in the electrochemical device, thereby improving performance, and thus possible ion conductivity is high. In addition, when the inorganic particles have a high density, it is preferable that the density is as small as possible, as it is difficult to disperse during coating and there is also a problem of weight increase during battery manufacturing. In addition, in the case of an inorganic material having a high dielectric constant, it is possible to improve the ionic conductivity of the electrolyte by contributing to an increase in dissociation of electrolyte salts, such as lithium salts, in the liquid electrolyte.

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

Examples of the non-aqueous liquid electrolyte include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, and gamma. -Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorun, formamide, dimethylformamide, dioxol , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxy methane, dioxon derivative, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbohydrate Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyropionate and ethyl propionate can be used.

Examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, poly agitation lysine, polyester sulfide, polyvinyl alcohol, polyvinylidene fluoride, Polymers including ionic dissociative 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 , Li ₄ nitrides such as SiO ₄ -LiI-LiOH, Li ₃ PO ₄ -Li ₂ S-SiS ₂ , halides, sulfates, and the like can be used.

The lithium salt is a material 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.

In addition, non-aqueous electrolytes have the purpose of improving charge / discharge characteristics, flame retardancy, and the like, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide , Nitrobenzene derivative, sulfur, quinone imine dye, N-substituted oxazolidinone, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxy ethanol, aluminum trichloride, etc. can be added It might be. In some cases, in order to impart non-flammability, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, or carbon dioxide gas may be further included to improve high temperature storage characteristics.

The present invention also provides a device including one or more of the battery pack.

The device may be selected from a mobile phone, a wearable electronic device, a portable computer, a smart pad, a netbook, a light electronic vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.

The structure of these devices and their manufacturing methods are well known in the art, so detailed descriptions thereof are omitted herein.

The present invention is also a method for manufacturing the battery pack,

(a) The position where the electrode assembly is sealed with the electrolyte inside the battery case and the two battery cells having electrode terminals at one end are spaced apart from each other with a PCM having protection circuits and terminal connections formed therebetween. In, the process of arranging the battery cells in a direction orthogonal to the electrode terminals;

(b) a process of welding or soldering and connecting the electrode terminals of the battery cells and the terminal connections of the PCM;

(c) placing the combined battery cells and PCM in a mold, and coating the entire outer surfaces of the battery cells and PCM with resin by insert injection molding;

It provides a method for manufacturing a battery pack comprising a.

In the method of manufacturing the battery pack, a connector is formed on one side of the PCM that is not in contact with the battery cells, and the insert injection molding covers the entire outer surface of the battery cells and the PCM except the connector with resin. You can.

As described above, in the battery pack according to the present invention, the battery cells are arranged in a direction perpendicular to each other with the electrode terminals spaced apart from each other with the PCM interposed therebetween. By being covered with resin by molding, the battery cells can be flexibly arranged in response to the battery storage space of the device on which the battery is mounted, and the process for stably combining the battery cells and the protection circuit module is quick and easy. It can be carried out to reduce the manufacturing time and cost, it is possible to achieve a lightweight and compact structure of the battery pack by resin coating.

1 is a perspective view of a battery pack according to an embodiment of the present invention;
2 is a perspective view of the battery pack of FIG. 1 in a state before resin coating;
3 is an enlarged view of the 'A' portion of FIG. 2;
4 is a flowchart of a method for manufacturing a battery pack according to an embodiment of the present invention.

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

1 is a perspective view schematically showing a battery pack according to one embodiment of the present invention, and FIG. 2 is a perspective view schematically showing the battery pack of FIG. 1 in a state before resin coating 41 is shown. 3 is an enlarged view of the 'A' portion of FIG. 2 schematically.

1 and 2, the battery pack 100 includes a first battery cell 300, a second battery cell 400, and a PCM 200.

The first battery cell 300, the second battery cell 400 and the PCM 200 are each formed in a square shape on a plane. The first battery cell 300 and the second battery cell 400 are separated from each other, and the electrode terminals 310 of the first battery cell 300 and the electrode terminals 410 of the second battery cell 400 are mutually spaced apart. They are arranged in orthogonal directions.

The PCM 200 is located between the first battery cell 300 and the second battery cell 400 and is electrically connected to each of the battery cells 300 and 400.

Specifically, in the first battery cell 300, in a state where the side where the electrode terminal 310 is formed is in contact with the first side 201 of the PCM 200, the electrode terminal 310 is the first of the PCM 200. It is connected to the terminal connection part 210.

The second battery cell 400 is in line with the third side 203 of the side where the electrode terminal 410 is formed while one side is in contact with the second side 202 of the PCM 200. Located in, the electrode terminal 410 of the second battery cell 400 extends in the direction of the third side 203 of the PCM 200, and the second terminal connection part 220 formed on the third side 203 It is connected in contact with.

The electrode terminal 410 of the second battery cell 400 includes an anode terminal 410a and a cathode terminal 410b. The extension structure of the positive electrode terminal 410a and the negative electrode terminal 410b is composed of terminal portions 411a, 411b, extension connecting portions 412a, 412b, and contact connecting portions 413a, 413b.

The terminal portions 411a, 411b protrude from the second battery cell 400, and the extended connection portions 412a, 412b are PCM (from the terminal portions 411a, 411b in a state orthogonal to the protruding direction of the terminal portions 411a, 411b). It extends in the direction of the third side 203 of 200, and the contact connecting portions 413a and 413b extend from the extending connecting portions 412a and 412b toward the PCM 200 and contact the second terminal connecting portion 220 for connection. It is done.

An insulating member (not shown) is interposed between the extended connection portion 412a of the positive electrode terminal 410a and the extended connection portion 412b of the negative electrode terminal 410b.

The connector 500 is formed in a protruding shape on the fourth side 204 that the battery cells 300 and 400 do not contact in the PCM 200, and the battery cells 300 and 400 except for the connector 500 ) And the entire outer surface of PCM 200 are covered with resin by insert injection molding.

The first battery cell 300 and the second battery cell 400 are formed in a shape in which the sides on which the electrode terminals 310 and 410 are formed on a plane have a relatively short length, and the first side of the PCM 200. The lengths L1 and L2 of the 201 and the second side 202 are the same as the length L3 of the side where the electrode terminals 310 of the first battery cell 300 are formed, respectively.

The length L2 of the second side 202 of the PCM 200 is formed to be relatively shorter than the length L4 of one side of the second battery cell 400 contacting the second side 202.

4 is a flowchart of a method of manufacturing a battery pack according to an embodiment of the present invention.

Referring to FIG. 4 together with FIG. 1, in order to manufacture the battery pack 100, first, the electrode assembly is sealed inside the battery case together with the electrolyte and electrode terminals 310 and 410 are formed at one end. The two battery cells (300, 400), the protection circuit and the terminal connections (210, 220) PCM (200) is formed between the spaced apart from each other, the electrode terminals (310, 410) The battery cells 300 and 400 are arranged in the mutually orthogonal direction (S100).

Next, the electrode terminals 310 and 410 of the battery cells 300 and 400 and the terminal connection parts 210 and 220 of the PCM 200 are welded or soldered and combined (S200).

Finally, the combined battery cells (300, 400) and PCM (200) are placed in the mold, and the entire outer surfaces of the battery cells (300, 400) and PCM (200) except for the connector (500) are insert injection molded. It is coated with a resin by (S300).

Those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above.

Claims (17)

A first battery cell and a second battery cell, wherein the electrode assembly is sealed inside the battery case together with the electrolyte, and is formed in a rectangular shape on a flat surface, and electrode terminals are formed at one end of a relatively short side;
A protection circuit module including a printed circuit board (PCB) having a protection circuit that controls voltage and current of charging and discharging, and terminal connections formed on the PCB so that the electrode terminals of the battery cells are electrically connected ( PCM);
It contains,
The PCM is formed with a first terminal connection portion connected to a first battery cell on its first side, and a second terminal connection portion connected to a second battery cell on a second side continuous from the first side,
The first and second battery cells are arranged in a direction in which the electrode terminals are mutually orthogonal to each other with the PCM spaced apart therebetween, and the first battery cell has a first side of the PCM of the side where the electrode terminals are formed. In contact with, the electrode terminals are connected in contact with the first terminal connection portion of the PCM, and the second battery cell is formed with the electrode terminals in a state where one side is in contact with the second side opposite to the first side of the PCM. The sides are located on the same line as the third side that is in contact with the first and second sides of the PCM, respectively.
The electrode terminal of the second battery cell, the terminal portion protruding from the battery cell; An extension connecting portion extending from the terminal portion in the third side direction of the PCM in a state orthogonal to the protruding direction of the terminal portion; And contact connection portions connected to and connected to a second terminal connection portion formed on a third side of the PCM extending from the extension connection portion,
The battery cells and the PCM is a battery pack characterized in that the entire outer surface is covered with resin by insert injection molding. delete delete delete The battery pack according to claim 1, wherein the electrode terminals are composed of a positive electrode terminal and a negative electrode terminal, and an insulating member is interposed between extension portions of each of the positive electrode terminal and the negative electrode terminal. The battery pack according to claim 1, wherein a connector is formed in a protruding shape on a fourth side that the battery cells are not in contact with in the PCM. The battery pack according to claim 6, wherein the battery cells excluding the connector and the entire outer surface of the PCM are covered with resin by insert injection molding. delete The battery pack according to claim 1, wherein the lengths of the first and second sides of the PCM are the same as the lengths of the sides on which the electrode terminals of the first battery cell are respectively formed. The battery pack according to claim 1, wherein the length of the second side of the PCM is relatively shorter than the length of one side of the second battery cell in contact with the second side. The battery pack according to claim 1, wherein the resin is rubber or plastic. The battery pack according to claim 1, wherein the battery cell is a pouch-type battery or a square battery. The battery pack according to claim 1, wherein the battery cell is a lithium secondary battery. A device comprising at least one of the battery packs according to any one of claims 1 to 5 or 7 or 9 to 13. 15. The method of claim 14, wherein the device is selected from a mobile phone, wearable electronics, portable computer, smart pad, netbook, light electronic vehicle (LEV), electric vehicle, hybrid electric vehicle, plug-in hybrid electric vehicle, and power storage device Device characterized in that. A method for manufacturing a battery pack according to any one of claims 1 to 5, or 9 to 13,
(a) The first battery cell and the second battery cell, wherein the electrode assembly is sealed inside the battery case together with the electrolyte and is formed in a rectangular shape on a flat surface, and electrode terminals are formed at one end of a relatively short side, A protection circuit and a PCM having a first terminal connection portion connected to a first battery cell formed on the first side and a second terminal connection portion connected to a second battery cell connected to a second side continued from the first side are interposed between the PCM. In a position spaced apart from each other, in the direction in which the electrode terminals of the first and second battery cells are orthogonal to each other, and one side of the second battery cell is in contact with the second side opposite to the first side of the PCM. , Arranging the first and second battery cells and the PCMs such that the sides on which the electrode terminals are formed are positioned on the same line as the third sides contacting the first and second sides of the PCM, respectively;
(b) welding the electrode terminal of the first battery cell and the first terminal connection portion of the PCM, and the contact connection portion formed extending from the extension connection portion of the electrode terminal of the second battery cell and the second terminal connection portion of the PCM. Soldering and bonding;
(c) placing the combined battery cells and PCM in a mold, and coating the entire outer surfaces of the battery cells and PCM with resin by insert injection molding;
Battery pack manufacturing method comprising a. 17. The method of claim 16, wherein the connector is formed in a protruding shape on one side that the battery cells do not contact in the PCM, the insert injection molding is to cover the entire outer surface of the battery cells and the PCM except the connector with resin. Method of manufacturing a battery pack, characterized by.

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