KR102466707B1 - Battery module and battery pack with cover structure in which bus bars are embedded - Google Patents

Abstract

A battery module and a battery pack with a bus bar embedded type cover structure are disclosed. A battery module with a bus bar embedded type cover structure according to the present invention, as a battery module accommodating a battery unit in which a plurality of battery cells are stacked, includes: a pair of side covers supporting both sides of the battery unit; an upper cover disposed to cover an upper surface of the battery unit; brackets which are disposed to support the front and rear surfaces of the battery unit and to which first and second bus bars connected to lead tabs provided at both ends of the battery cell are mounted; and an embedded bar integrated with the upper cover in an embedded shape to be electrically connected between at least one of the first bus bar and the second bus bar. According to the present invention, the electrical connection between battery cells that are separated from each other can be made simply and accurately in the assembly process of the upper cover without a series of complex installation processes so that the efficiency of the assembly work for the battery module can be promoted and the battery module with a compact structure can be manufactured so as to improve the integration degree of charging energy.

Description

Battery module and battery pack having a bus bar buried cover structure

The present invention relates to a battery module and a battery pack having a bus bar buried cover structure, and more particularly, to a battery in which a separately provided bus bar is integrated into a protective cover structure to connect separated battery cells or battery modules. It's about modules.

Secondary batteries that repeatedly store and supply electrical energy go beyond the field of conventional small and high-tech electronic devices such as mobile phones, PDAs, and notebook computers. ) or as a power source for hybrid electric vehicles (HEVs).

Secondary batteries widely used in current storage systems (ESS) or electric vehicles (EV) can be classified into lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, etc. These secondary batteries is repeated charge and discharge with an output voltage of approximately 25V to 42V per unit cell.

Therefore, when higher output voltage and power capacity are required, a battery module is formed by electrically connecting several battery cells, or a high-output battery pack is formed by arranging and connecting these battery modules in series or parallel and adding other circuits. will constitute

At this time, electrical connection between a plurality of battery cells or battery modules adjacent to each other may be made by bus bars of brackets installed to face electrode terminals of the battery cells or battery modules.

In addition, for the electrical connection between battery cells or battery modules that are not adjacent to each other, first, a long bar-shaped bus bar is separately manufactured, and the bar-shaped bus bar is placed on the upper part so that spaced battery cells or battery modules are mutually connected to each other. After fixing, it is achieved only through the process of insulation (or coating) treatment.

As described above, since the rod-type bus bar is separately installed between the protective cover and the battery cell or battery module, the manufacturing process of the battery module or battery pack becomes complicated, and the space for installation is increased, resulting in compactness of the battery module or battery pack. There is an obstruction problem.

However, conventional battery modules, such as the serial connection device for battery modules of Korean Patent Publication No. 10-2019-0131246 (published date: November 26, 2019), when a certain current flows, between the series connection devices for battery modules Only technologies that prevent danger by disconnecting circuits are presented, but consideration for technologies that can easily connect separated battery cells or battery modules to improve assemblability and install bus bars in a compact structure is still insufficient. The situation is.

Korean Patent Publication No. 10-2019-0131246 (published on November 26, 2019)

An object of the present invention is to simply and accurately electrically connect battery cells or battery modules that are separated from each other, as well as to simplify the installation process of bus bars disposed in battery modules or battery packs, and to simplify the installation process of battery modules or battery packs. To provide a battery module and battery pack having a bus bar buried cover structure that can mass-produce in a more compact structure than before.

The above object is a battery module for accommodating a battery unit in which a plurality of battery cells are stacked inside, a pair of side covers for supporting both sides of the battery unit; an upper cover disposed to cover an upper surface of the battery unit; a bracket disposed to support the front and rear surfaces of the battery unit, and to which first and second bus bars connected to lead tabs provided at both ends of the battery cell are mounted; And a battery module having a bus bar buried cover structure, characterized in that it includes a buried bar integrated in the upper cover to electrically connect between at least one of the first bus bar and the second bus bar. is achieved

The buried bar may include a first exposed terminal exposed from one end of the upper cover and electrically connected to the first bus bar; a second exposed terminal exposed from the other end of the upper cover and electrically connected to the second bus bar; and a connection bar electrically connecting the first and second exposed terminals and buried in the upper cover in a covered form.

The embedding part formed in the upper cover so that the connection bar is covered and buried may be formed by double-injecting plastic having heat dissipation properties with respect to the first injection-molded upper cover except for the embedding part.

The upper cover adjacent to the side cover is foldably connected to each other based on at least one of the pair of side covers and the living hinge, and may be integrally injection molded.

Another object of the above is to electrically connect a plurality of battery modules arranged in a battery pack for accommodating the inside, a housing for accommodating the plurality of battery modules arranged in an inner space; an upper frame coupled to cover an upper portion of the housing; And a battery having a bus bar buried cover structure, characterized in that it comprises a buried bar integrated in the form of being buried in the upper plate frame and electrically connecting between the bus bars of the battery modules that are not adjacent to each other among the plurality of battery modules. achieved by the pack.

The buried bar may include a first exposed terminal exposed from one end of the upper plate frame and electrically connected to one of the bus bars of the battery module; a second exposed terminal exposed from the other end of the top plate frame and formed to be electrically connected to a bus bar of the battery module that is not adjacent to any one of the battery modules; and a connection bar that electrically connects the first and second exposed terminals and is buried in the upper plate frame in a covered form.

According to the present invention, the first bus bar and the second bus bar are mounted on the bracket so as to be connected to the lead tabs provided at both ends of the battery cells constituting the battery unit, and electrically connect between at least one first bus bar and the second bus bar. As the connecting buried bar is integrated in the form of being buried in the upper cover covering the upper surface of the battery unit, the electrical connection between the battery cells that are separated from each other can be simply and accurately made during the assembly process of the upper cover without a complicated series of installation processes. Efficiency of assembly work can be promoted, and the battery module can be manufactured with a compact structure, so that the degree of integration of charging energy can be improved.

1 is an exploded perspective view of a battery module having a bus bar buried cover structure according to an embodiment of the present invention.
2 is a plan view of a buried bar and a side cover integrally formed with an upper cover as in FIG. 1;
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 .
FIG. 4 is a plan view showing the structure of a battery pack in which a plurality of battery modules of FIG. 1 are connected to each other through buried bars.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted to clarify the gist of the present invention.

1 is an exploded perspective view of a battery module having a bus bar buried cover structure according to an embodiment of the present invention, FIG. 2 is a plan view of a buried bar and a side cover integrally formed with an upper cover as in FIG. 1, FIG. is a cross-sectional view along the line A-A in FIG. 2, and FIG. 4 is a plan view showing the structure of a battery pack in which a plurality of battery modules of FIG. 1 are connected to each other through buried bars.

Top (top), bottom (bottom), left and right (side or side), front (front, front), back (back, back), etc., which refer to directions in the description and claims of the invention, etc., are not intended to limit the use of rights. For convenience of description, the relative position between the drawings and configurations is determined as a standard, and the three axes may be rotated and changed to correspond to each other, and this is followed unless otherwise specifically defined.

In the battery module 100 having a bus bar buried cover structure according to the present invention, the electrical connection between the battery cells 10 separated from each other is simply and precisely made during the assembly process of the upper cover 130 without a series of complicated installation processes. It is an invention devised to enable the battery module 100 to be manufactured in a more compact structure while improving the efficiency of the assembly work for the battery module 100.

In order to specifically implement the functions or actions as described above, the battery module 100 having a bus bar buried cover structure according to the present invention, as shown in FIGS. 1 to 3, the battery unit 110, the side Covers 120a and 120b, upper covers 130, brackets 140a and 140b, and buried bars 150 may be included.

Hereinafter, each configuration described above will be described in detail.

First, the battery unit 110 is a component provided to generate a predetermined output voltage and power, and a plurality of pouch-type (flat plate-shaped) battery cells 10 are stacked so that their flat surfaces overlap in the transverse direction. will compose

Between the plurality of battery cells 10 constituting the battery unit 110, a buffer pad made of a material such as polyurethane prevents swelling caused by charging and discharging and protects the battery cells 10 from external impact. (not shown) may be interposed.

Here, the battery cell 10 includes a positive electrode plate and a negative electrode plate in the electrolyte, a film surrounding and sealing the electrolyte, the positive plate and the negative plate, and a protruding plate-shaped electrode electrically connecting the positive and negative electrode plates and the external bus bars 142 and 144, respectively. The lead tab 12 and the like may be included.

At this time, the lead tab 12 may be formed in the front and rear, respectively, as shown in FIG. 1 or the like, or may be formed together in any one direction among the front and rear, as shown.

The above-described battery unit 110 is merely a component in which already known and commercialized battery cells 10 are simply laminated in the horizontal direction, and is not related to the gist of the present invention, so specific details about the structure or operating characteristics thereof Description is omitted.

The side covers 120a and 120b contact and support both sides of the battery unit 110 where the swelling phenomenon occurs in the direction in which the battery cells 10 are stacked, and provide electrical insulation and heat dissipation functions for the battery unit 110 together. It is a component of the plate that performs.

These side covers 120a and 120b are coupled or fitted by various fastening means such as bolts to an upper cover 130 to be described later to form both side surfaces of the battery module 100 .

However, the side covers 120a and 120b according to the embodiment of the present invention have rigidity to suppress the swelling phenomenon as well as heat generated in the battery unit 110 according to charging and discharging to the outside and dissipate heat to the battery unit 110. ), it may be configured including an end plate and a shield plate, etc.

Here, the end plate is a plate-shaped component provided to smoothly transfer heat generated by the operation of the battery unit 110 from both sides of the battery unit 110 to the outside, respectively, and is made of an aluminum alloy plate having excellent thermal conductivity. It is to form the outer, that is, the outer side of the side covers (120a, 120b).

In order to secure necessary rigidity, reinforcing irregularities protruding in a predetermined shape may be formed by embossing press processing on the end plate, and an insulating coating may be applied to the surface of the end plate to electrically shield the battery unit 110 .

The shielding plate has a plate shape forming the inside of the side covers 120a and 120b to contact and insulate both sides of the battery unit 110 while transferring heat generated from the battery unit 110 to the above-described end plate. is a component of

Such a shielding plate may be integrally molded with the above-described end plate by inserting a pre-manufactured end plate into a mold and then injecting an engineering plastic having excellent insulation, heat resistance, rigidity, and flame retardancy.

In addition, as shown in FIGS. 1 to 3 , the shield plate may be connected to an upper cover 130 to be described later in a foldable manner based on a living hinge (LH) and may be injection molded together.

At this time, the engineering plastic used for molding the shielding plate includes at least one of PPS (Polyphenylene Sulfide), PEEK (Polyetheretherketone), TPI (Thermoplastic Polyimide), PES (Polyethersulfone), PPA (Polyphthalamide), and PEI (Polyetherimide). It may be an engineering plastic that

Here, PPS is a heat-resistant resin having excellent mechanical strength, chemical resistance, etc., and a use temperature of 240 ° C., and is an engineering plastic mainly used for electrical / mechanical parts requiring heat resistance due to flame retardant properties.

In addition, PEEK is a heat-resistant resin with excellent chemical resistance and abrasion resistance and a use temperature of 260 ° C. It is an engineering plastic.

TPI is a heat-resistant resin with excellent abrasion resistance, rigidity, creep resistance, and chemical resistance, and a glass transition temperature of 250 ° C. It is an engineering plastic mainly used for electric/electronic parts, machinery, and new material parts in the aerospace industry.

PES is a heat-resistant resin with high dimensional stability and excellent flame retardancy and a working temperature of 150 to 160 ° C. It can be used instead of glass, metal, ceramics, etc., so it is an engineering plastic with a very wide range of application fields.

PPA is a heat-resistant resin with excellent chemical resistance, low water absorption, and a use temperature of 185 ° C.

PEI is a heat-resistant resin with high stiffness, high strength, flame retardancy, dimensional stability, and especially electrical properties, and a working temperature of 180 ° C.

The above-mentioned various heat-resistant resins may be used in the injection molding of the shielding plate by selecting one or properly mixing two or more of them in order to realize necessary physical properties.

In addition, in order to further enhance heat dissipation and rigidity, the shielding plate may be manufactured by injection molding plastic obtained by adding a graphene material or powder such as aluminum as a filler to the above-described engineering plastic.

Here, the graphene material is a component to compensate for the thermal conductivity and rigidity lacking in heat-resistant plastics, and is a next-generation new material in which carbon atoms form a hexagonal lattice, that is, a honeycomb structure to form a two-dimensional planar structure, It is thin and light with a thickness of several nm to several tens of μm, and is 200 times stronger than steel, has excellent electrical conductivity and thermal conductivity, and has excellent physical and chemical properties.

The above required characteristics related to the shielding plate and the integration of the end plate and the upper cover 130 suppress swelling of the battery unit 110, integrate and simplify parts of the battery module 100, and battery unit 110 This is to promote efficient thermal management and diffusion delay in case of fire in the battery unit 110.

The upper cover 130 is a plate-shaped component that is disposed to cover the upper surface of the above-described battery unit 110 to protect the battery unit 110 and block external diffusion in case of fire or explosion of the battery cell 10. As, it forms the upper surface of the battery module 100.

The upper cover 130 according to an embodiment of the present invention smoothly transfers the heat generated by the operation of the battery unit 110 from the top of the battery unit 110 to the outside, while the buried bar 150 to be described later In order to insulate and integrate a previously manufactured embedding bar 150 to be described later, it may be integrally molded with the embedding bar 150 by inserting an engineering plastic into the closed mold.

At this time, as described above, the engineering plastics for the upper cover 130 used to be integrally molded with the inserted buried bar 150 are PPS, PEEK, TPI, PES, PPA having excellent insulation, heat resistance, stiffness and flame retardancy. And it may be a plastic containing at least one of PEI. (See Figs. 2 and 3)

In addition, as described above, the upper cover 130 integrally injection-molded with the buried bar 150 to be described later is, as shown in FIGS. 1 to 3, at least one of the pair of side covers 120a and 120b. ) (shielding plate) and the living hinge (LH) are connected to each other to be foldable, and may be integrally formed by injection molding.

Specifically, the living hinge (LH) connects between the shield plate and the upper cover 130 of the above-described side covers 120a and 120b and is injection molded together with the side covers 120a and 120b to form the side covers 120a and 120b. As a component for guiding the relative rotation of, for smooth relative rotation, it may be formed with a thinner thickness than the adjacent side covers 120a and 120b and the upper cover 130.

In this case, the thin living hinge LH may be molded by forming protrusions provided on at least one of the molded upper mold and lower mold.

As described above, due to the thin living hinge (LH), the above-described side covers (120a, 120b) and the top cover 130 can be stored and managed in a state connected to each other without a separate fastening operation.

And since the living hinge (LH) guides the simple and convenient rotation so that the side covers 120a and 120b are accurately supported on both sides of the battery unit 110 and assembled, the work required for assembling the battery module 100 is reduced. It can be saved and the efficiency of the assembly work can be achieved.

The brackets 140a and 140b are disposed to support the front and rear surfaces of the battery unit 110, respectively, and face the lead tabs 12 of the battery cells 10 constituting the battery unit 110. As a plate-shaped component, the front and rear surfaces of the battery module 100 are respectively formed.

Fixing grooves into which the plurality of stacked battery cells 10 are inserted may be formed in the brackets 140a and 140b, and seating grooves into which the bus bars 142 and 144 are mounted and fixed may be formed on surfaces opposite to the fixing grooves. can

As shown in FIG. 1, the bus bars 142 and 144 are coupled to the side covers 120a and 120b or the top cover 130 of the battery cell 10 in the process of coupling the pair of brackets 140a and 140b. One end side (front side) of the first bus bar 142 electrically connected to the lead tab 12 and firmly bound by welding or the like, and the other end side (rear side) lead tab 12 of the battery cell 10 and electrically It may be configured to include a second bus bar 144 connected to and firmly bound by welding or the like.

The first and second bus bars 142 and 144 are electrically connected to the above-described lead tab 12 of the battery cell 10 to stably transfer a high voltage output to the outside without loss of the battery cell 10. As a conductor (for example, a copper plate) provided in plurality at both ends, it is manufactured in various forms such as a short bar shape bent for electrical connection with an external circuit (not shown) or a ring shape for parallel connection of battery cells 10. It can be.

The brackets 140a and 140b according to an embodiment of the present invention are manufactured by press-processing a metal material having excellent heat dissipation, such as aluminum, to form fixing grooves and seating grooves, and then insulatively coating the brackets. The covers 120a and 120b or the upper cover 130 may be fitted or coupled by various fastening means such as bolts.

In addition, although not specifically shown, the brackets 140a and 140b are foldably connected to each other based on the upper cover 130 and the living hinge LH as above, and may be integrally injection molded, or at least one of the above-described brackets 140a and 140b. Of course, the side covers 120a and 120b and the living hinge LH are connected to each other to be foldable and integrally injection molded.

As described above, the plastic used for injection molding of the brackets 140a and 140b may include at least one of PPS, PEEK, TPI, PES, PPA, and PEI having excellent insulation, heat resistance, stiffness, and flame retardancy, Of course, powder such as graphene or aluminum may be included as a filler in order to realize excellent heat dissipation and rigidity.

Here, since the living hinge (LH) can be sufficiently understood by the aforementioned description, the detailed description will be replaced with the above description.

The buried bar 150 does not connect the first bus bar 142 or the second bus bar 144 adjacent to each other, but the first bus bar 142 and the second bus bar 144 that are structurally separated from each other. ) It is a component that is integrated in the form of being buried in the above-described upper cover 130 to electrically connect between them.

If the buried bar 150 is made of a rod-shaped conductor (for example, a copper plate) capable of electrically connecting the specific first bus bar 142 and the second bus bar 144 that are separated from each other, connection or conduction For this purpose, the bent shape and the like are not particularly limited.

As described above, due to the buried bar 150 being integrally formed with the upper cover 130, a complex series of installation processes such as a bar-type bus bar that has been manufactured and installed separately from the conventional upper cover 130 (separate production, arrangement and fixing) , insulation treatment, etc.) can be omitted, and the specific first bus bar 142 and the second bus bar 144 that are separated from each other can be easily and accurately electrically connected together with the assembly work of the upper cover 130, and if necessary Accordingly, the first and second bus bars 142 and 144 requiring connection can be freely changed.

In addition, since the arrangement space or installation space of the conventional rod-shaped bus bar formed separately from the upper cover 130 is unnecessary, the battery module 100 or the battery pack 200 can be made compact.

As shown in FIGS. 1 to 3, the buried bar 150 according to an embodiment of the present invention includes a first exposed terminal 152, a second exposed terminal 154, a connecting bar 156, and the like. can be configured.

Here, the first exposed terminal 152 is a component exposed from one end of the upper cover 130 and electrically connected to the first bus bar 142, corresponding to the position or shape of the first bus bar 142. A bent shape that can be electrically connected while making surface contact with each other is sufficient, and the thickness or width is not particularly limited.

The second exposed terminal 154 is a component exposed from the other end of the upper cover 130 and electrically connected to the second bus bar 144, and like the first exposed terminal 152, the second bus bar 144 ) It is not particularly limited as long as it is a bent shape that can be electrically connected while making surface contact with each other corresponding to the position or shape of the ).

As described above, the connection bar 156 is integrally formed with the first and second exposed terminals 152 and 154 to electrically connect the first and second exposed terminals 152 and 154 corresponding to both ends of the buried bar 150. It is a component that forms the conductor of

This connection bar 156 is like an upper cover in the process of being integrated with the upper cover 130 that is molded by inserting a pre-manufactured buried bar 150 into a mold and then injecting the above-described engineering plastic into the closed mold. It can be buried in a covered form in (130).

As the connection bar 156 is buried in the upper cover 130 in a covered form as described above, the buried bar 150 can be firmly installed and fixed to the upper cover 130, and at the same time, the first and second electrical connections are exposed. Portions other than the terminals 152 and 154 can be electrically insulated from the outside without separate coating or insulating coating.

On the other hand, the buried portion 132 of the above-described upper cover 130 forming the covering portion so that the connection bar 156 is not exposed to the outside and is electrically insulated, as shown in FIG. 3, the buried portion 132 Except, it may be formed by double-injecting plastic having heat dissipation properties with respect to the upper cover 130 which is primarily injection molded, which is to more smoothly dissipate the heat generated from the connecting bar 156 to the outside.

Specifically, the embedding part 132 of heat dissipation, excluding the previously manufactured embedding bar 150 and the embedding part 132, inserts the upper cover 130, which is primarily injection-molded with the above-described engineering plastic, into a mold. After that, it can be integrally molded with the embedding bar 150 by injecting engineering plastic with stronger heat dissipation than the upper cover 130 into the closed mold.

At this time, in order to enhance heat dissipation than the upper cover 130, a large amount of graphene material or powder such as aluminum may be added as a filler to the engineering plastic compared to the upper cover 130, and the upper cover 130 A plurality of heat dissipation protrusions may be formed on an upper surface where the formed buried portion 132 and outside air contact each other.

In the battery pack 200 according to the present invention, the electrical connection between the battery modules 100 that are separated from each other is simply and accurately made during the assembly process of the top plate frame 230 without a series of complicated installation processes, and the battery pack 200 This invention was made to promote the efficiency of assembly work and the compactness of the battery pack 200.

Specifically, as shown in FIG. 4, the battery pack 200 according to an embodiment of the present invention is a high-powered high-power electricity storage made by storing a plurality of battery modules 100 electrically connected to each other and arranged therein. As a device, it may be configured to include a housing 210, a top plate frame 230 and a buried bar 250, and the like.

Here, the housing 210 is a bowl-shaped component with an open top to accommodate a plurality of battery modules 100 arranged in an internal space, and includes the side covers 120a and 120b of the battery module 100 described above and It can be understood as corresponding to the brackets 140a and 140b, etc., and a detailed description thereof will be omitted.

In addition, the upper plate frame 230 is a component coupled to cover the upper part of the above-described housing 210, and can be understood as corresponding to the upper cover 130 of the battery module 100 described above. A detailed description will be omitted.

The buried bar 250 is integrated in the form of being buried in the above-described upper plate frame 230 to electrically connect between the bus bars 142 and 144 of the battery modules 100 that are not adjacent to each other among the plurality of battery modules 100. It is a component designed for

As shown in FIG. 4 , the buried bar 250 of the battery pack 200 may include a first exposed terminal 252, a second exposed terminal 254, a connecting bar 256, and the like. have.

Here, the first exposed terminal 252 is a component formed to be exposed from one end of the upper plate frame 230 and electrically connected to the bus bars 142 and 144 of any one battery module 100, and the second exposed terminal ( 254 is a component formed to be exposed from the other end of the top plate frame 230 and electrically connected to the bus bars 142 and 144 of the battery module 100 that are not adjacent to any one of the battery modules 100, and the connection bar Reference numeral 256 electrically connects the above-described first and second exposed terminals 252 and 254 and is a component embedded in the upper plate frame 230 in a covered form.

As described above, the buried bar 250 of the battery pack 200 is, as described above, the buried bar 150 of the battery module 100 provided to connect non-adjacent battery cells 10 and Since there is only a slight difference in the subject of application, it will be replaced with the description of the buried bar 150 of the battery module 100 described above.

As described above, the buried bars 150 and 250 electrically connecting the first and second bus bars 142 and 144 of the battery cell 10 or the bus bars 142 and 144 of the battery module 100 that are separated from each other according to the present invention As the battery module 100 and the battery pack 200 are integrated in the form of being buried in the upper cover 130 or the upper plate frame 230, respectively, the electrical connection between the battery cell 10 or the battery module 100 is conventional. It can be simply and accurately performed in the assembly process of the upper cover 130 or the upper plate frame 230 without a complicated series of installation processes, and the battery module 100 and the battery pack 200 can be manufactured with a compact structure There is a cancellation effect.

In the foregoing, although specific embodiments of the present invention have been described and shown, the present invention is not limited to the described embodiments, and it is common knowledge in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have Therefore, such modifications or variations should not be individually understood from the technical spirit or viewpoint of the present invention, and modified embodiments should fall within the scope of the claims of the present invention.

10: battery cell
12: lead tab
100: battery module having a bus bar buried cover structure
110: battery unit
120a, 120b: side cover
130: upper cover
132,232: landfill
LH: Living Hinge
140a, 140b: bracket
142: first bus bar (bus bar)
144: second bus bar (bus bar)
150,250: buried bar
152,252: first exposed terminal
154,254: second exposed terminal
156,256: connecting bar
200: battery pack
210: housing
230: top frame

Claims (6)

A battery module for accommodating a battery unit in which a plurality of battery cells are stacked,
a pair of side covers supporting both side surfaces of the battery unit; an upper cover disposed to cover an upper surface of the battery unit; a bracket disposed to support the front and rear surfaces of the battery unit, and to which first and second bus bars connected to lead tabs provided at both ends of the battery cell are mounted; And a buried bar integrally embedded in the upper cover to electrically connect at least one of the first bus bar and the second bus bar,
The buried bar,
a first exposed terminal exposed from one end of the upper cover and electrically connected to the first bus bar; a second exposed terminal exposed from the other end of the upper cover and electrically connected to the second bus bar; And a connection bar electrically connecting the first and second exposed terminals and buried in the upper cover in a covered form,
A buried portion formed in the upper cover so that the connection bar is covered and buried,
Excluding the previously manufactured buried bar and the buried portion, the upper cover, which is primarily injection-molded, is inserted into a mold, and then a plastic having heat dissipation than the upper cover is double-injected into the closed mold to form an integrated body with the buried bar, ,
A battery module having a bus bar buried cover structure, characterized in that a plurality of heat dissipation protrusions are formed on the upper surface where the buried portion and the outside air contact. delete delete According to claim 1,
The upper cover adjacent to the side cover,
A battery module having a bus bar buried cover structure, characterized in that at least one of the pair of side covers and the living hinge are connected to each other foldably and integrally injection molded.
delete delete

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