KR101305229B1 - Unit Module Having External Covering Member and Heat Dissipation Member and Battery Module Comprising the Same - Google Patents

Abstract

The present invention provides a unit module including plate-shaped battery cells, comprising: a first battery cell, a second battery cell, and a third battery cell in which electrode terminals are connected to each other in parallel and form a stacked structure in close contact with each other; A first exterior member and a second exterior member coupled to the outermost surface of the first battery cell and the outermost surface of the third battery cell so as to surround the outer surfaces of the stacked battery cells except for the electrode terminals; Provides a unit module comprising a; heat dissipation member is mounted while contacting at least one surface of both sides of the second battery cell, the heat dissipation member having an end portion coupled to the first outer member and / or the second outer member. .

Description

Unit module having an outer member and a heat dissipation member and a battery module including the same {Unit Module Having External Covering Member and Heat Dissipation Member and Battery Module Comprising the Same}

The present invention relates to a unit module having a novel structure, and more particularly, to a unit module including plate-shaped battery cells, the first battery cell of which the electrode terminals are interconnected in parallel and forming a stacked structure in close contact with each other. A second battery cell and a third battery cell; A first exterior member and a second exterior member coupled to each other to surround the outer surfaces of the stacked battery cells except for the electrode terminals; The present invention relates to a unit module including a heat dissipation member mounted while contacting at least one surface of both surfaces of a second battery cell.

Due to the development of technology and demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries, which have high energy density, high operating voltage and excellent storage and life characteristics, It is widely used as an energy source.

The secondary battery is roughly classified into a cylindrical battery, a prismatic battery and a pouch-shaped battery according to the structural characteristics of the outside and the inside. Among them, the secondary battery can be stacked with a high degree of integration, and prismatic batteries and pouch- .

In addition, the secondary battery is attracting attention as an energy source for electric vehicles, hybrid electric vehicles, and the like, which is proposed as a solution for air pollution in existing gasoline vehicles and diesel vehicles using fossil fuels.

Therefore, the type of applications using the secondary battery is very diversified due to the advantages of the secondary battery, and it is expected that the secondary battery will be applied to many fields and products from now on.

As the application fields and products of the secondary battery are diversified, the type of the battery is also diversified to provide an appropriate output and capacity. In addition, batteries applied to the art and products are strongly required for small size and light weight.

For example, small mobile devices such as mobile phones, PDAs, digital cameras, notebook computers, and the like are used with one or two or four small light battery cells per device according to the miniaturization tendency of the products. On the other hand, medium and large devices such as electric vehicles and hybrid electric vehicles, due to the need for high output capacity, a battery module (or sometimes referred to as a "battery pack") electrically connecting a plurality of battery cells or unit modules is used. Since the size and weight of the battery module are directly related to the accommodation space and the output of the medium and large devices, manufacturers are trying to manufacture a battery module that is as small and lightweight as possible.

However, the prior art does not propose a battery module having a structure that can be manufactured in a compact and stable structure while including a plurality of battery cells while minimizing weight increase.

Meanwhile, in the conventional unit module, a method of using a pair of cell covers is used to fix two battery cells, but the structure of such a unit module is difficult to configure three battery cells into one unit module. There is a problem.

Accordingly, there is a great need for a unit module having a novel structure and a battery module including the same to solve the above problems.

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

Specifically, it is an object of the present invention to provide a unit module having a compact structure that can be easily manufactured using a pair of exterior members and a heat dissipation member of three battery cells.

Still another object of the present invention is to provide a unit module which can minimize the increase in weight and size while effectively reinforcing the low mechanical rigidity of the battery cell and is easily coupled without a separate fastening member.

The unit module according to the present invention for achieving this object,

A unit module including plate-shaped battery cells,

A first battery cell, a second battery cell, and a third battery cell in which electrode terminals are connected to each other in parallel and form a stacked structure in close contact with each other;

A first exterior member and a second exterior member coupled to the outermost surface of the first battery cell and the outermost surface of the third battery cell so as to surround the outer surfaces of the stacked battery cells except for the electrode terminals;

A heat dissipation member mounted to be in contact with at least one surface of both surfaces of the second battery cell, and having an end portion coupled to the first exterior member and / or the second exterior member;

As shown in FIG.

Accordingly, the unit module according to the present invention realizes a compact structure by bringing three battery cells into close contact with a pair of exterior members and a heat dissipation member, and a battery module composed of these unit modules is assembled into two battery cells. Compared to the battery module consisting of the unit modules can provide a high capacity to volume of the same battery module.

In addition, since the heat dissipation member is mounted while contacting at least one surface of both surfaces of the second battery cell, even though the module is configured with the second battery cell located between the first battery cell and the third battery cell, the battery cell body And by using the heat transfer principle of the heat radiation member can further improve the cooling efficiency of the second battery cell.

Further, the unit module, the electrode terminals are interconnected in parallel to form a stack structure of the battery cells, except for the electrode terminal portion is surrounded by a pair of outer member is bonded to the entire outer surface of the laminated battery cells In addition, while protecting the battery cell with low mechanical rigidity, it is possible to prevent the sealing part of the battery cell from being separated by repetitive expansion and contraction change during charging and discharging.

In one preferred embodiment, the electrode terminals may be formed together at the top or the bottom, or may be formed at the top and the bottom, respectively, for example, in order to achieve electrical parallel connection of the electrode terminals, the electrode terminals may be at the top or the bottom. It is preferable that it is formed together at.

In another example, the electrode terminal of the first battery cell and the electrode terminal of the third battery cell is bent symmetrically with respect to the electrode terminal of the second battery cell so as to contact the electrode terminal of the second battery cell, The electrical connection between them is achieved.

In the above structure, the coupling of the electrode terminals may be implemented in various ways, such as welding, soldering, mechanical fastening, preferably by welding.

In another example, the exterior member and the heat dissipation member has an inner surface structure corresponding to the outer surface shape of the battery cells, and in particular, the outer member and the heat dissipation member are coupled to each other by an assembly coupling method that does not require a separate fastening member.

Specifically, the assembly fastening method may be implemented in various ways, for example, a fastening groove formed in the cross-section coupling portion of the first exterior member, and a shape corresponding to the fastening groove to the second exterior member and the heat dissipation member. It may be made of a combination of fastening protrusions formed. In such a structure, the fastening protrusion is slidably fastened to the corresponding fastening groove so as to mechanically fasten the exterior members and the heat dissipating member.

That is, the cross-section coupling portion between the exterior members or the cross-section coupling portion of the exterior member and the heat dissipation member, preferably, so as to be engaged by the elastic coupling when the members are pressed in a state in which the members face each other, It may be made of a structure that is coupled by a fastening groove.

In this case, the assembly fastening structure enables simple coupling of the exterior members and the heat dissipation member without the use of other fastening members, thereby improving manufacturing productivity and manufacturing a compact unit module. As described above, the fastened exterior The members and the heat dissipation member may be bound together to surround the battery cells, thereby maintaining a solid structure of the battery cells in an environment such as shock or vibration.

One or more openings communicating with the outside are formed in the cross-section coupling portion of the second exterior member and / or the heat dissipation member, so that the refrigerant cools the respective battery cells to improve cooling efficiency of the unit module. You can.

In another preferred example, the left and right ends of the exterior member may have a structure in which edges bent upward or downward are formed so as not to contact the left and right ends of the battery cells.

Therefore, the edge prevents insulation breakdown by contacting both left and right ends of the battery cells and left and right ends of the exterior members, thereby solving the problem of shortening the lifespan of the battery cells due to the leakage of current from the battery cells. have.

In the present invention, the plate-shaped battery cell is not particularly limited as long as it is a secondary battery capable of charging and discharging. For example, a lithium secondary battery, a nickel-hydrogen (Ni-MH) secondary battery, a nickel-cadmium (Ni-Cd) secondary battery And the like, and among these, a lithium secondary battery that provides a high output to weight may be preferably used.

The lithium secondary battery is classified into a cylindrical battery, a square battery, a pouch-type battery, and the like according to its shape. Among them, the battery cell of the present invention may be preferably applied to a plate-shaped battery cell in which a sealing portion formed by heat fusion is formed at an end portion of an outer circumferential surface thereof. have. In one preferred embodiment, the plate-shaped battery cell of the present invention may be made of a structure in which the electrode assembly of the anode / separator / cathode structure is built in the battery case of the laminate sheet comprising a resin layer and a metal layer, specifically, heat-sealed It may be a light weight pouch-type battery in which the electrode assembly is built in a battery case of a laminate sheet including an inner resin layer, a barrier metal layer, and a durable outer resin layer.

In the pouch-type battery, the battery case may be formed in various structures. For example, the battery case may be formed as a member of two units to seal the upper and lower contact portions after storing the electrode assembly in the upper and / or lower inner surfaces. It may be a structure. A pouch-type battery having such a structure is disclosed in PCT International Application No. PCT / KR2004 / 003312 to the applicant, which is incorporated by reference in the context of the present invention.

The electrode assembly is composed of a positive electrode and a negative electrode to enable charging and discharging, for example, a structure in which the positive electrode and the negative electrode are laminated with a separator therebetween, a jelly-roll method, a stack type method, or a stack-fold type method. Consists of The positive electrode and the negative electrode of the electrode assembly may have a form in which electrode tabs thereof protrude directly to the outside of the battery, or the electrode tabs may be connected to separate leads and protrude out of the battery.

On the other hand, in the secondary battery, if heat generated during charging and discharging is not effectively discharged to the outside, serious problems may occur in terms of battery life and safety.

Considering this point as a whole, the exterior members and the heat dissipation member are preferably made of a high thermal conductive metal plate so that heat generated from the battery cells therein can be more easily discharged to the outside.

The outer surface of the outer member has a structure in which a plurality of linear protrusions are formed spaced apart from each other in the longitudinal direction of the battery cells, the refrigerant in the longitudinal direction of the outer member (for example, air) in the unit module stacked state By flowing, the cooling efficiency can be further improved.

At both ends of the upper protrusion and the lower protrusion of the linear protrusions, preferably, circular protrusions and circular grooves are formed to facilitate coupling with adjacent unit modules. It has a shape corresponding to each other, it is possible to prevent the position of the stack between the unit modules are reversed or shifted.

In some cases, the linear protrusions may be configured such that both ends thereof are smaller than the width of the exterior member so that the refrigerant flows in the longitudinal direction as well as in the width direction of the exterior member.

Side edges of the exterior members may have a step size of a predetermined size to facilitate fixing of the module when coupled to the frame member.

Preferably, a stepped portion having a predetermined size for facilitating the fixing of the unit module may be formed on the side surfaces adjacent to the upper and lower ends of the outer sheath members. In some cases, the stepped portion may be formed on the side surface . More preferably, a step is formed at both the upper and lower ends and the left and right ends of the exterior member to more securely secure the unit module.

The step may have a size of 5 to 20% based on the thickness of the sheathing member so as to facilitate fixing of adjacent unit modules.

The present invention also provides a battery module including a plurality of the unit modules.

Preferred examples of such a battery module,

A unit module stack having a structure in which the unit modules are mounted in a cartridge and arranged in a side direction;

A cover member mounted at four corners of the unit module stack; And

A voltage sensing assembly mounted on the front or rear of the unit module stack to sense the voltage of the battery cells;

It may include a structure that includes.

In the front of the cartridge, preferably, the coupling portion of the structure in which the mounting insulating member for mounting the voltage sensing assembly and the bus bar can be fastened in an assembly manner so that the voltage sensing assembly can be stably connected to the bus bar. It may be made of a structure that is formed, for example, the bus bar may be a structure that is heat-sealed to the injection molding of the mounting insulating member.

The mounting insulation member is preferably made of a rectangular parallelepiped structure having a size corresponding to the front surface of the unit module stack, and a rear surface of the cartridge is formed with a cartridge coupling groove into which the front end of the cartridge can be inserted and coupled. It may have a structure in which the electrode terminal through grooves are formed on both sides so that the electrode terminal connecting portion of the battery cell is introduced from the rear to be exposed.

For example, on the front surface of the mounting insulating member, mounting portions for external input / output terminal connecting portions for stably mounting the external input / output terminal connecting portions of the bus bars are formed at both ends, and for block cases for mounting the block case stably. The seating portion may be formed at a central portion, and the seating portion for the bus bar for mounting the bus bar may have a size corresponding to the bus bar.

The cartridge is preferably

A rectangular structure corresponding to the unit module so that the unit module can be mounted therein, and a heat dissipation through hole for radiating heat is formed at the center portion;

The fastening device for the unit module into which the fastening member for the unit module for fixing the unit modules may be formed may have a structure formed at four corners.

On the other hand, the voltage sensing assembly, for example,

(a) a block case made of an electrically insulating material and mounted on the front or rear side of the battery module in a horizontal direction in a space between the electrode terminal connections of the battery cells;

(b) wires connected to voltage sensing terminals formed integrally with an upper end portion or a lower end portion of a bus bar electrically connected to an electrode terminal connection portion of the battery cells; And

(c) a connector for transmitting the detected voltage of the wires to a control unit;

It may be made of a structure comprising a.

Therefore, since the member for sensing the voltage of the battery cells has a modular assembly structure, the voltage sensing assembly can be easily mounted on the front or the rear of the battery module.

In addition, the assembly structure composed of separate independent parts as described above enables the outer production, greatly improving the manufacturing productivity of the battery module, when the abnormality of the components constituting the voltage sensing assembly, compared with the conventional battery module Maintenance is also greatly improved because only the voltage sensing assembly mounted on the front or rear of the battery module needs to be replaced without disassembling the inside of the module.

The block case includes a fastener protruding in the front direction to stably fix the wires, and the block case is configured to be connected to a voltage sensing terminal of a bus bar in a state where the wires are mounted on the fastener of the block case. Can be.

Therefore, the voltage sensing assembly of the above structure has a structure in which the wires are connected to the voltage sensing terminals of the bus bars in a state where the wires are mounted on the fasteners of the block case, so that the overall assembly process is simple and the voltage can be detected compactly and stably. can do.

In addition, since the wires are connected to the voltage sensing terminal of the bus bar without a separate assembly such as a receptacle terminal, the cost can be reduced by reducing the number of parts, and the contact resistance of the assembly parts does not occur, thereby improving the reliability of voltage sensing. Can be.

The battery module according to the present invention has a compact structure as a whole and can achieve structurally stable mechanical fastening and electrical connection without using a large number of members. Further, by configuring the battery module with predetermined units, for example, 4, 6, 8, 10, etc. battery cells or unit modules, it is possible to effectively mount the battery modules in the required number of limited spaces .

Accordingly, the present invention provides a high-output large-capacity battery pack manufactured using the battery module as a unit.

The battery pack may be used as a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device, and may be an electric vehicle, a hybrid electric vehicle, a plug- Are well known in the art, and a detailed description thereof will be omitted.

As described above, in the unit module according to the present invention, since three battery cells are assembled by a pair of exterior member and a heat dissipation member, the capacity is increased compared to the unit module composed of two battery cells, thereby per unit volume. It is possible to manufacture a battery module and a battery pack of a compact structure that provides a relatively high capacity or high output.

In addition, the unit module according to the present invention can minimize the increase in weight and size while effectively reinforcing the low mechanical rigidity of the battery cell, it can be easily coupled without a separate fastening member.

1 is a perspective view of a battery cell mounted in a unit module;
Fig. 2 is an exploded schematic view of Fig. 1; Fig.
3 is an exploded perspective view of a unit module according to one embodiment of the present invention;
4 is a perspective view illustrating a state in which the unit module of FIG. 3 is coupled;
5 is a front view of the unit module of FIG. 4 viewed from the front side (C);
6 is a schematic cross-sectional view taken along line D-D 'of the unit module of FIG. 5;
7 is a perspective view of a battery module equipped with a voltage sensing assembly according to another embodiment of the present invention;
8 is an enlarged perspective view illustrating a portion A of the battery module of FIG. 7;
9 is an enlarged perspective view of a portion B of FIG. 8;
10 is a partially enlarged view illustrating a front surface of the battery module of FIG. 7;
11 is a perspective view showing that the front cover is attached to the front of the battery module of FIG.
12 is a perspective view illustrating a state in which the cover member is partially removed from the battery module of FIG. 11.

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

1 is a perspective view of an exemplary battery cell mounted on a unit module of the present invention, and FIG. 2 is an exploded schematic view of FIG.

Referring to these figures, the pouch-shaped battery cell 200 includes an electrode assembly including an anode, a cathode, and a separator disposed between the anode and cathode taps 220 and 230 And two electrode terminals 222 and 232, which are electrically connected to each other, are sealed to be exposed to the outside.

The battery case 100 includes a case body 140 including a concave shaped storage portion 142 on which the electrode assembly 210 can be seated and a lid 150 integrally connected to the body 140 have.

The electrode assembly 210 having the stacked or stacked / folded structure has a plurality of anode tabs 220 and a plurality of anode tabs 230 welded to each other and coupled to the electrode terminals 222 and 232. In addition, when the excess portion 144 and the cover 150 of the case body 140 are heat-sealed by the heat welder, the short between the heat welder and the electrode terminals 222 and 232 is prevented from occurring and the electrode terminal 222 is prevented. The insulating film 240 is attached to upper and lower surfaces of the electrode terminals 222 and 232 to secure the sealing property between the battery pack 232 and the battery case 100.

The case body 140 and the cover 150 are composed of an outer resin layer 110, a barrier metal layer 120, and an inner resin layer 130, and the inner resin layer 130 is an outer surface of the case body 140. And it can be tightly fixed by the heat and pressure from the heat welding machine (not shown) applied to the outer surface of the cover 150.

The sealing part is formed by heat-sealing the contact portion between the excess part 144 of the case body 140 and the cover 150 while the electrode assembly 210 impregnated with the electrolyte is seated on the accommodating part 142.

3 is an exploded perspective view schematically showing a unit module according to an embodiment of the present invention, Figure 4 is a perspective view schematically showing a state in which the unit module of Figure 3 is coupled.

In addition, FIG. 5 is a front view schematically showing the unit module of FIG. 4 as seen from the front side (C), and FIG. 6 is a schematic cross-sectional view of D-D 'of the unit module of FIG.

Referring to these drawings, the unit module 510 may include a first battery cell 512, a second battery cell 514, and a third battery cell 516, a first exterior member 520, which is a metal plate, respectively. The second exterior member 524 and the heat dissipation member 522 are configured.

The first battery cell 512, the second battery cell 514, and the third battery cell 516 form a stacked structure in which electrode terminals are closely connected to each other in parallel to each other, and the first exterior member 520 and the second battery cell 520 are in close contact with each other. The exterior member 524 is coupled to the outermost surface of the first battery cell 512 and to the outermost surface of the third battery cell 516 so as to surround the outer surfaces of the stacked battery cells except for the electrode terminals.

The heat dissipation member 522 is mounted while being in contact with one surface of the second battery cell 514, the end is coupled to the first exterior member 520, and the electrode terminals of the battery cells 512, 514, and 516 are at the top thereof. Are formed together.

The electrode terminal of the first battery cell 512 and the electrode terminal of the third battery cell 516 are mutually symmetrical with respect to the electrode terminal of the second battery cell 514 so as to contact the electrode terminal of the second battery cell 514. The electrode terminals are bent and the electrode terminals are joined by welding.

The first exterior member 520, the second exterior member 524, and the heat dissipation member 522 have an inner surface structure corresponding to the outer surface shape of the battery cells 512, 514, and 516, and are coupled in an assembly fastening manner. have.

The cross-section coupling portion 538 of the first exterior member 520 and the second exterior member 524 and the cross-section coupling portion of the exterior members 520 and 524 and the heat dissipation member 522 may include fastening protrusions 546 and 547. It is composed of a structure coupled by the fastening grooves 549, when the first exterior member 520, the second exterior member 524 and the heat dissipation member 522 is in contact with each other in contact with each other to the elastic coupling Interlocked by

Specifically, eight fastening grooves 549 corresponding to the eight fastening protrusions 546 and 547 of the second exterior member 524 and the heat dissipation member 522 are formed in the cross-section coupling portion of the first exterior member 520. Two openings 539 communicating with the outside are formed at the end face coupling portions of the second exterior member 524 and the heat dissipation member 522, respectively, and are used as the flow paths of the refrigerant.

In addition, edges 552 and 554 that are upwardly bent are formed at left and right ends of the first exterior member 520 and the heat dissipation member 522, and edges that are bent downward in the left and right ends of the second exterior member 524. Since 556 is formed, the first exterior member 520, the second exterior member 524, and the heat dissipation member 522 do not contact the left and right ends of the battery cells 512, 514, and 516.

This structure prevents insulation breakdown from occurring by contacting both left and right ends of the first exterior member 520, the second exterior member 524, and the heat dissipation member 522 of the battery cells 512, 514, and 516. The current leaked from the battery cells 512, 514, 516 flows to the first outer member 520, the second outer member 524, and the heat dissipation member 522, and thus the lifetime of the battery cells 512, 514, 516. This effectively prevents shortening.

Meanwhile, three linear protrusions 543 and 544 are spaced apart from each other in the longitudinal direction L of the battery cells 512, 514, and 516 on the outer surfaces of the first exterior member 520 and the second exterior member 524. , 545 is formed, and a pair of circular protrusions 541 are formed at both ends of the upper protrusion 543 and the lower protrusion 545 of the linear protrusions 543, 544, and 545 to facilitate coupling with adjacent unit modules. ) And circular grooves 542 are formed, respectively.

Both ends of the linear protrusions 543, 544, and 545 are smaller than the width length W of the first exterior member 520 and the second exterior member 524 and the first exterior member 520 and the second exterior member. Steps 547 of a predetermined size are formed on side surfaces adjacent to the upper and lower ends of 524 to facilitate fixing of the unit module.

In addition, the side surfaces adjacent to the left and right ends of the first exterior member 520 and the second exterior member 524 have a step 548 having a predetermined size to facilitate fixing of the unit module.

7 is a perspective view schematically showing a battery module equipped with a voltage sensing assembly according to another embodiment of the present invention, Figure 8 is a perspective view showing an enlarged portion A of the battery module of FIG. It is.

9 is a perspective view schematically showing an enlarged portion B of FIG. 8.

Referring to these drawings, the voltage sensing assembly 300 controls the detection voltage of the block case 310 made of an electrically insulating material, the wires 320 connected to the voltage sensing terminals, and the wires 320, respectively. The connector 330 sent to (not shown) is included.

The block case 310 is mounted on the front surface of the battery module 800 in a horizontal direction in a space between the electrode terminal connection portions of the battery cells, and the voltage sensing terminals 342 and 346 are connected to the electrode terminal of the battery cells. And a lower end or an upper end of the bus bars 340 which are electrically connected to each other.

Clamp-shaped fasteners 312 protrude in the front direction of the block case 310 to stably fix the wires 320, and the wires 320 are fasteners 312 of the block case 310. It is connected to the voltage sensing terminal 346 of the bus bar 340 in a state mounted on the.

In addition, openings 314 are formed at positions corresponding to the voltage sensing terminals 342 so that the voltage sensing terminals 342 of the bus bar 340 may be inserted into the upper and lower ends of the block case 310. The voltage sensing terminal 342 has a clamping structure into which the wire 320 is inserted and inserted.

The wires 320 are embedded in the insulating tubular member 322 to insulate the outside, and the bus bar 340 includes a plate-shaped body 344 and a voltage sensing terminal 342.

The plate-shaped body 344 is bent at both ends vertically so as to be electrically connected to the electrode terminal coupling portion of the battery cell, the voltage sensing terminal 342 is formed integrally with the upper end or the lower end of the plate-shaped body.

In addition, a bus bar connected to the positive external input / output terminal 402 and the negative external input / output terminal 404 has an external input / output terminal connecting portion 348 extending downward from one side of the lower end of the plate-shaped body 344 in a diagonal direction. It includes.

Since the fastening groove 349 is drilled in the external input / output terminal connection portion 348 of the bus bar, the external input / output terminal 404 is inserted into the fastening groove 349 so that the electrical connection between the bus bar and the external input / output terminal 404 is established. Is achieved.

In addition, the voltage sensing terminal 346 of the bus bar connected to the positive external input / output terminal 402 and the negative external input / output terminal 404 is a bus bar body 344 vertically bent toward the front of the battery module 800. It is formed in the lower end of the).

The partitions 316 are formed on the top and bottom surfaces of the block case 310 to prevent electricity from being supplied.

FIG. 10 is a partially enlarged view schematically showing the front surface of the battery module of FIG. 7, and FIG. 11 is a perspective view schematically showing that the front cover is attached to the front surface of the battery module of FIG. 7. 12 is a perspective view schematically showing a state in which the cover member is partially removed from the battery module of FIG. 11.

4 and 7 to 9, the battery module 900 includes a voltage sensing assembly 300, two unit module stacks 500, and four corners of the unit module stacks 500. It is composed of a cover member 600 attached to.

In the unit module stack 500, three battery cells 512, 514, and 516 are coupled by two exterior members 520, 524 and one heat dissipation member 522. The dog is arranged side by side.

Mounting insulating member 700 is composed of a rectangular parallelepiped structure having a size corresponding to the front of the unit module stack 500, the cartridge coupling groove (not shown) that can be coupled to the front end of the cartridge inserted into the rear The electrode terminal through-grooves 710 are formed on the front surface thereof so that the electrode terminal connection portions of the battery cells can be introduced and exposed from the rear side.

In addition, the mounting portion 720 for the external input / output terminal connection portion is formed at both ends of the front surface of the mounting insulating member 700 in order to stably mount the external input / output terminal connection portion 348 of the bus bar 340, The case mounting part 730 is formed at the front center portion of the mounting insulating member 700 to stably mount the block case 330.

The bus bar seating parts 740 are formed in a size corresponding to the bus bar 340 on the front surface of the mounting insulating member 700 to mount the bus bar 340.

In addition, the electrode terminal connection portion of the battery cell exposed through the electrode terminal through groove 710 is electrically connected to both side surfaces of the bus bar 340 mounted in the electrode terminal through groove 710.

The bus bar 340 is coupled to the bus bar seating part 740 by heat fusion, and partition walls 750 and 752 are formed on the top and bottom surfaces of the mounting insulating member 700 to prevent moisture. To prevent power failure.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (22)

A unit module comprising plate-shaped battery cells,
A first battery cell, a second battery cell, and a third battery cell in which electrode terminals are connected to each other in parallel and form a stacked structure in close contact with each other;
A first exterior member and a second exterior member coupled to the outermost surface of the first battery cell and the outermost surface of the third battery cell so as to surround the outer surfaces of the stacked battery cells except for the electrode terminals;
Is mounted while contacting at least one surface of both sides of the second battery cell, the end is coupled to (i) the first outer member or (ii) the second outer member or (iii) the first outer member and the second outer member Including a heat dissipation member of the structure,
The exterior module and the heat dissipation member is a unit module, characterized in that made of a metal plate. The unit module according to claim 1, wherein the electrode terminals are formed at an upper end or a lower end together, or are formed at an upper end and a lower end, respectively. According to claim 1, wherein the electrode terminal of the first battery cell and the electrode terminal of the third battery cell is bent symmetrically with respect to the electrode terminal of the second battery cell so as to contact the electrode terminal of the second battery cell. Unit module, characterized in that. The unit module of claim 3, wherein the electrode terminals are coupled by welding. The unit module of claim 1, wherein the exterior members and the heat dissipation member have an inner surface structure corresponding to the outer surface shape of the battery cells, and are coupled in an assembly fastening manner. According to claim 5, wherein the cross-sectional coupling portion between the exterior member or the cross-sectional coupling portion of the exterior member and the heat dissipation member, the fastening so that the members can be engaged by the resilient coupling when pressed in a state in which the members facing each other, Unit module, characterized in that consisting of a structure coupled by the projection and the fastening groove. The unit module according to claim 6, wherein the end face coupling portion of the first sheathing member has fastening grooves corresponding to the fastening protrusions of the second sheathing member and the heat dissipation member. 6. The at least one opening of claim 5, wherein (i) the second sheathing member or (ii) the heat dissipation member or (iii) the cross-section coupling portion of the second sheathing member and the heat dissipation member is in communication with the outside for use as a flow path for the refrigerant. Unit module, characterized in that is formed. The unit module of claim 1, wherein edges bent upward or downward are formed at left and right ends of the exterior members so as not to contact the left and right ends of the battery cells. The unit module according to claim 1, wherein the battery cell is a pouch type battery cell in which an electrode assembly is built in a case of a laminate sheet including a resin layer and a metal layer. delete The unit module of claim 1, wherein a plurality of linear protrusions spaced apart from each other in the longitudinal direction of the battery cells are formed on outer surfaces of the exterior members. The unit module of claim 12, wherein circular protrusions and circular grooves are formed at both ends of the upper protrusion and the lower protrusion of the linear protrusions to facilitate coupling with adjacent unit modules. 13. The unit module according to claim 12, wherein the linear protrusions are smaller at both ends thereof than the width of the exterior members. The unit module according to claim 1, wherein a stepped portion having a predetermined size for facilitating fixing of the unit module is formed on a side surface adjacent to an upper end and a lower end of the outer casing. The unit module according to claim 1, wherein stepped portions having a predetermined size for facilitating fixing of the unit modules are formed on the side surfaces adjacent to left and right ends of the exterior members. A unit module laminate having a structure in which the unit modules according to claim 1 are mounted on a cartridge and arranged side by side;
A cover member mounted at four corners of the unit module stack; And
A voltage sensing assembly mounted on the front or rear of the unit module stack to sense the voltage of the battery cells;
The battery module comprising: The method of claim 17, wherein the cartridge,
A rectangular structure corresponding to the unit module so that the unit module can be mounted therein, and a heat dissipation through hole for radiating heat is formed at the center portion;
Battery module characterized in that the fasteners for the unit module is inserted into the four corners is inserted into the fastening member for the unit module for fixing the unit modules. The method of claim 17, wherein the voltage sensing assembly,
(a) a block case made of an electrically insulating material and mounted on the front or rear side of the battery module in a horizontal direction in a space between the electrode terminal connections of the battery cells;
(b) wires connected to voltage sensing terminals formed integrally with an upper end portion or a lower end portion of a bus bar electrically connected to an electrode terminal connection portion of the battery cells; And
(c) a connector for transmitting the detected voltage of the wires to a control unit;
The battery module comprising: 20. The terminal of claim 19, wherein the block case includes a fastener protruding in the front direction to stably fix the wires, and the terminal for voltage sensing of the bus bar while the wires are mounted in the fastener of the block case. Battery module, characterized in that connected with. A high output large capacity battery pack manufactured by using the battery module according to claim 17 as a unit. 22. The battery pack as claimed in claim 21, wherein the battery pack is used as a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.

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