KR102352625B1 - Battery Pack using battery module with short-circuit protection structure - Google Patents

Abstract

A battery pack according to the present invention is a battery pack comprising two or more battery modules each having secondary batteries stacked and arranged in one direction, arranged in close contact with each other, and an inter-bus bar electrically connecting the battery modules. ,
Each of the battery modules includes: a plurality of bus bars electrically connected to electrode leads of the secondary batteries, respectively; and a positive terminal and a negative terminal separated from the plurality of bus bars and disposed to be electrically disconnected from the bus bars and two predetermined bus bars from among the plurality of bus bars further include an extension part for terminal connection, each of which has one end extending to a predetermined position toward the positive terminal and the negative terminal, wherein the inter bus bar includes at least the A portion of the extension for terminal connection and a portion of the positive terminal of one battery module and a portion of the negative terminal of the other battery module adjacent to each other may be integrally provided to overlap.

Description

Battery Pack using battery module with short-circuit protection structure

The present invention relates to a battery pack, and more particularly, to a battery module to which an external short circuit prevention structure is applied, and to a battery pack in which electrical safety and connection reliability are achieved during an assembly process using the same.

A secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. In addition, secondary batteries are also in the spotlight as a power source for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are proposed as a solution to air pollution, such as conventional gasoline and diesel vehicles using fossil fuels. .

A plurality of secondary batteries may be electrically connected to increase capacity and output. The battery module may be referred to as an aggregate composed of a plurality of secondary batteries connected in series and/or parallel as described above.

In particular, due to the need for high output and large capacity in medium-to-large devices such as electric vehicles, a battery pack implemented by electrically connecting a plurality of battery modules to the battery module is used as a basic unit.

Since these battery modules and battery packs are preferably manufactured as small as possible in size and weight, prismatic batteries and pouch-type batteries that can be stacked with high density and have a small weight to capacity are mainly used as unit cells of the battery module.

Meanwhile, a battery module or a battery pack has various issues related to safety. For example, the battery module has a risk of sudden performance degradation and explosion due to overcharging or overdischarging during operation, voltage imbalance for each secondary battery cell, swelling caused by an increase in withstand voltage during charging and discharging, and overcurrent. Therefore, a battery module or battery pack includes a battery protection circuit such as a PCM (Protection Circuit Module) or BMS (Battery Management System) with a cell balancing function as one component to prevent overdischarge, overcharge, and overcurrent as a way to secure stability. have.

Nevertheless, there is still the possibility that the battery module will have safety problems due to an external short circuit until it is assembled into an external device or battery pack.

In general, secondary batteries constituting the battery module are packaged inside the module housing and are not exposed to the outside, but the positive and negative terminals are exposed outside the module housing. For this reason, in the process of assembling a battery pack using the battery module, a metal object may contact the positive and negative terminals of the battery module, thereby causing an external short circuit. As such, when the positive and negative terminals are short-circuited by a metal object, an overcurrent may instantaneously flow in the battery module, thereby damaging or overheating the secondary batteries, which may cause a fire or explosion. Therefore, there is a need for a method for preventing an external short circuit in the process of assembling a battery pack using unit battery modules.

Republic of Korea Patent Publication No. 10-2017-0028847 (2017.03.14) Hyundai Mobis Co., Ltd.

The present invention has been devised to solve the above problems, and it is to provide a battery module capable of preventing abnormal overcurrent from flowing due to an external short circuit and a battery pack with safety in the assembly process using such a battery module. The purpose.

According to an aspect of the present invention, there is provided a battery pack comprising two or more battery modules each having secondary batteries stacked in one direction, arranged in close contact with each other, and an inter-bus bar electrically connecting the battery modules. ,

Each of the battery modules includes a plurality of bus bars electrically connected to the electrode leads of the secondary batteries, respectively; and a positive terminal and a negative terminal separated from the plurality of bus bars and disposed to be disconnected from the bus bars, The two predetermined bus bars among the plurality of bus bars further include an extension part for terminal connection, each of which has one end extending to a predetermined position toward the positive terminal and the negative terminal, and the inter bus bar is at least connected to the terminal A portion of the extended portion for use and a portion of the positive terminal of one battery module and a portion of the negative terminal of the other battery module adjacent to each other may be integrally provided to overlap.

The inter-bus bar may include a contact reinforcing part provided to be press-fitted in a space between the positive terminal or the negative terminal and the extension for connecting the terminal.

Each of the battery modules may further include a main cover provided to integrally cover the plurality of bus bars except for the extension part for terminal connection.

Each of the positive terminal and the negative terminal is disposed on the front part of the battery module, and includes a plate-shaped terminal plate part and a bolt part protruding vertically from the terminal plate part, and an extension for connecting the terminal One side of the unit may be located on the same virtual plane as the one side of the terminal plate unit.

At least a portion of the terminal connection extension portion may be provided to correspond to a width of the terminal plate portion.

The terminal connection extension portion includes a first section extending straight toward the terminal plate portion, a second section intersecting the first section and extending to correspond to at least a width of the terminal plate portion, and crossing the second section and crossing the terminal a third section extending away from the plate portion, wherein the second section is electrically connected to the positive terminal or the negative terminal by the inter-bus bar, and the third section has an end bent inside the battery module It may be connected to a printed circuit board provided in the.

Each of the battery modules further includes frames for stacking that accommodate at least one secondary battery inside in the form of a square frame, and are respectively erected and stacked in a horizontal direction, and each of the stacking frames has a different lower end It has a support portion provided to protrude more in the longitudinal direction than the portion, and a long bolt is inserted into a hole formed in the center region of the support portion of the frames for stacking so that they can be integrally fixedly coupled.

Each of the battery modules further includes an end plate provided in the form of a plate bent so as to surround the upper and both sides of the stacking frames, the end plate is disposed on the outermost side of the lower end of the portion surrounding the both sides It may be fixedly coupled to the support portion of the laminated frame.

Each of the battery modules further includes a sensing board that provides a place where the plurality of bus bars, the positive terminal, and the negative terminal can be mounted, is supported by the support part, and is detachably provided on the frames for stacking. may include

According to another aspect of the present invention, an electric vehicle including the above-described battery pack may be provided.

According to one aspect of the present invention, it is possible to prevent an abnormal overcurrent from flowing due to an external short circuit before assembling the battery pack unit during a transportation process, thereby providing a battery module with improved safety.

The battery module is provided in a structure separated from the secondary batteries so that the electrode terminals are deactivated except when necessary, so that it is possible to prevent a safety accident due to an external short circuit without increasing space and cost or excessive design changes compared to the prior art.

According to another aspect of the present invention, it is possible to electrically activate the battery modules by connecting an inter-bus bar to the electrode terminals of the battery modules.

Other objects and advantages of the present invention may be understood by the following description, and will become more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the appended claims.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later. should not be construed as being limited only to
1 is a partially exploded perspective view of a battery module according to an embodiment of the present invention.
FIG. 2 is a front view of the sensing assembly of FIG. 1 ;
FIG. 3 is a rear view of the sensing assembly of FIG. 1 .
4 and 5 are a front view and a perspective view of the battery module before mounting the protective cover according to an embodiment of the present invention.
6 is a perspective view of the battery module after mounting the protective cover according to an embodiment of the present invention.
7 is a perspective view of a battery module with a temporary cover removed according to an embodiment of the present invention.
8 is a perspective view of a battery pack configured by assembling battery modules according to an embodiment of the present invention.
9 and 10 are views illustrating a state before/after assembling a battery pack using battery modules according to an embodiment of the present invention.
11 is an enlarged view of an inter-bus bar connection portion of FIG. 10 .
12 is a cross-sectional view taken along line I-I' of FIG. 11 .
FIG. 13 is a view corresponding to FIG. 12 to which an inter-bus bar according to another embodiment of the present invention is applied.
14 is a schematic perspective view of the inter-bus bar of FIG. 13 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Accordingly, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

1 is a partially exploded perspective view of a battery module according to an embodiment of the present invention.

Referring to FIG. 1 , the battery module 10 according to an embodiment of the present invention includes a cell assembly 100 , a sensing assembly 200 , a positive terminal 300a and a negative terminal 300b functioning as external terminals, and and a protective cover 400 .

First, looking at the cell assembly 100 constituting the battery module 10 of the present invention, the cell assembly 100 includes secondary batteries, stacking frames 120 , and an end plate 130 . .

As a secondary battery constituting the cell assembly 100 , pouch-type battery cells may be employed. The pouch-type battery cells may be stacked in one direction, for example, in a horizontal direction with a wide surface erected.

The stacking frame 120 is a component used to stack pouch-type secondary batteries, and is configured to hold pouch-type secondary batteries lacking in mechanical rigidity to prevent their flow and to be stacked with each other to guide the assembly of secondary batteries. do

The stacking frame 120 may be replaced with various other terms such as a cartridge, and may be configured in the form of a square frame with an empty central portion. These stacking frames 120 may accommodate at least one pouch-type battery cell and may be respectively erected and stacked in a horizontal direction. In this case, the frames 120 for stacking may be coupled to each other by a snap-fit method or the like.

In particular, each of the frames for stacking 120 according to the present embodiment includes a support portion 121 provided by having one of the four corners longer. As shown in FIG. 1 , when the stacking frames 120 are erected and stacked, the lower end becomes more protruding in the longitudinal direction than other portions, thereby forming a step. Accordingly, the sensing assembly 200 to be described later may be disposed and supported on the support part 121 .

In addition, a hole may be provided in the central region of the support part 121 . In the stacking frames 120 , the holes of the support parts 121 may be stacked to match left and right, for example, a fastening member such as a shoulder bolt B is inserted into the holes of the support parts 121 to be integrally formed. can be fixed. In this case, since the frames for stacking 120 are connected to one body by a snap-fit fastening as well as a shoulder bolt (B), fixability may be further improved.

The end plate 130 is a component serving to provide mechanical support for the stacking frames 120 and to protect them from external impact. The end plate 130 may be made of a metal material such as steel to ensure rigidity.

The end plate 130 according to the present embodiment has a bent plate shape, and includes an upper plate 131 and left and right side plates 132 extending in a vertical downward direction from both edges of the upper plate 131 . The frames for stacking 120 may be surrounded by the top and both sides by the end plate 130 .

For example, the end plate 130 and the frame for stacking 120 may be assembled in such a way that the end plate 130 is overlaid on the frames for stacking 120 . In this way, when the end plate 130 is overlaid on the stacking frame 120 , a fastening location between the end plate 130 and the stacking frame 120 can be reduced. That is, in the case of this embodiment, the lower ends of the left and right side plates 132 of the end plate 130, that is, the four lower corners 132a of the left and right side plates are the supporting parts 121 of the stacking frames 120 located at the outermost sides. ) can be fixedly coupled to the bolts. According to such a configuration, a spring-back phenomenon in which the left and right side plates 132 are separated from the end plate 130 can be prevented, and the end plate 130 and the stacking frame 120 are stably connected to each other. can be combined.

As shown in FIG. 1 , in this cell assembly 100 , the electrode leads 111 of the secondary batteries pass through a slit provided in the stacking frame 120 to be exposed to the front and rear surfaces of the stacking frames 120 . can

For reference, depending on the shape of the pouch-type battery cell, the positive lead and the negative lead extending in opposite directions may be used as in the present embodiment, and in some cases, those extending in the same direction may be used.

The sensing assembly 200 is basically configured to be electrically connected to the electrode lead 111 , and may be mounted on at least one of the front and rear surfaces of the cell assembly 100 according to a position where the electrode lead 111 is exposed. Therefore, in the present embodiment, the sensing assembly 200 may be mounted one at a time on the front and rear surfaces of the cell assembly 100 .

2 is a front view of the sensing assembly 200 of FIG. 1 , FIG. 3 is a rear view of the sensing assembly 200 of FIG. 2 , and FIGS. 4 and 5 are a protective cover 400 according to an embodiment of the present invention, respectively. It is a front view and a perspective view of the battery module 10 before mounting.

Referring to these drawings, the sensing assembly 200 may include a plurality of bus bars 210 , a sensing board 220 , and a printed circuit board 230 .

The sensing board 220 may be provided to be mounted on the cell assembly 100 , and the plurality of bus bars 210 , the printed circuit board 230 , the positive terminal 300a and the negative terminal 300b, etc. It is a component that provides a place to mount the parts of

The sensing board 220 may be injection-molded as an insulating material such as plastic. In this embodiment, the sensing board 220 has slits through which the electrode leads 111 can pass back and forth around the position where the bus bars 210 are to be mounted, and the support part 121 of the stacking frame 120 . Except for the stacking frame 120 may be manufactured in a size corresponding to the front or rear surfaces. In addition, the sensing board 220 may be attached to and detached from the cell assembly 100 in a snap-fit manner by providing a hook around the rim, and the lower end thereof may be supported by the support portions 121 of the stacking frames 120 . have.

The printed circuit board 230 may be a component including a processor chip for detecting electrical characteristics of secondary batteries, for example, a voltage of each secondary battery cell and controlling charging and discharging of the secondary battery cells. One end of the plurality of bus bars 210 may be connected to the printed circuit board 230 .

The printed circuit board 230 may be mounted on the rear surface of the sensing board 220 as shown in FIG. 3 . The printed circuit board 230 according to the present embodiment may be manufactured to have a size smaller than the arrangement area of the bus bars 210 and may be attached to the upper central upper region of the rear surface of the sensing board 220 . By disposing the printed circuit board 230 on the rear surface of the sensing board 220 as described above, it is possible to protect the printed circuit board 230 as well as connectivity with the bus bars 210 and the space of the sensing board 220 . The degree of freedom can be increased.

For example, as shown in FIGS. 2 and 3 , the bus bars 210 in the middle region may be connected to the printed circuit board 230 by passing through the sensing board 220 back and forth with bent ends, and the positive and negative electrodes The bus bars 210a and 210b are detoured compared to other bus bars 210 due to the location of the printed circuit board 230 so that the end 211d of the third section of the terminal connection extension 211 is the printed circuit board ( 230) can be connected.

The bus bars 210 are metal plates having conductivity such as copper (CU) and are mounted on the front surface of the sensing board 220 , and electrode leads 111 passing through slits formed on the sensing board on the surface are ultrasonically welded. attached by the method. A positive lead of any one secondary battery and a negative lead of the other may be attached to one bus bar 210 . In addition, one negative lead may be attached to the rightmost bus bar 210b in the arrangement order, and one positive lead may be attached to the leftmost bus bar 210a. The secondary batteries may be connected in series by attaching each electrode lead 111 to the bus bars 210 in this pattern.

Here, the bus bar 210 to which only one negative lead is attached as above is referred to as a negative bus bar 210b, and the bus bar to which only one positive lead is attached is referred to as a positive bus bar 210a. As will be described later in detail, the anode bus bar 210a and the cathode bus bar 210b each have an extension part 211 for connecting a terminal whose one end is extended to a predetermined position toward the anode terminal 300a and the cathode terminal 300b. more can be provided.

4 and 5 , the positive terminal 300a and the negative terminal 300b are respectively provided to be mounted on the front portion of the sensing assembly 200 , that is, at both upper corners of the sensing board 220 . The positive terminal 300a and the negative terminal 300b according to the present embodiment have the same structure, and the terminal plate part 310 formed in a substantially rectangular plate shape and protruding vertically with respect to the terminal plate part 310 are formed. It may include a bolt portion 320 that is.

In particular, the positive terminal 300a and the negative terminal 300b according to the present invention are located on top of the positive and negative bus bars 210a and 210b, but are separated from the bus bars 210 and are separated from the bus bars 210 and placed in an electrically isolated state.

Accordingly, the positive terminal 300a and the negative terminal 300b separated from the bus bars 210 in this way can be said to be in an inactive state as an external electrode terminal of the battery module 10 . The positive terminal 300a and the negative terminal 300b of the battery module 10 according to the present invention must be electrically connected to the bus bars 210 by a medium such as the inter-bus bar 20 later in the battery module. It can be activated as an external electrode terminal of (10).

The battery module 10 according to the present invention may further include a protective cover 400 .

The protective cover 400 is a component that serves to protect the battery module 10 from the risk of an external short circuit by covering the plurality of bus bars 210 and the electrode leads 111 so as not to be exposed to the outside. The protective cover 400 may be mounted on the front portion of the sensing assembly 200 in which the bus bars 210 are located.

5 and 6 , it can be seen that all bus bars 210 positioned under the positive terminal 300a and the negative terminal 300b are covered by the protective cover 400 . Therefore, in the battery module 10 according to the present invention, all regions with a potential for conduction, that is, the bus bars may be insulated by being shielded by the protective cover 400 , and as described above, the positive terminal 300a and the negative terminal 300b ) as an external terminal, since the function is inactive, no current flows even if a metal object comes into contact with the positive terminal 300a and the negative terminal 300b.

Since the battery module 10 according to the present invention is provided in a state in which the electrode terminals 300a and 300b do not function as external terminals during the transportation process or the battery pack assembly process, abnormal overcurrent due to an external short circuit is prevented from flowing. This can be prevented, so there is no risk of safety accidents.

Meanwhile, the protective cover 400 according to an embodiment of the present invention may include a main cover 410 and a temporary cover 420 as shown in FIGS. 6 and 7 .

The main cover 410 integrally covers the bus bars 210 except for the terminal connection extension 211 , and is always attached to the sensing assembly 200 except during maintenance of the battery module 10 . exist in the state

The temporary cover 420 is a part that covers the extension part 211 for terminal connection, and there are two, one on each of the positive terminal 300a and the negative terminal 300b, and may be configured to be detachable from the main cover 410 . .

As shown in FIG. 7 , when the temporary cover 420 is removed from the main cover 410 , the terminal connection extension 211 may be exposed to the outside. The temporary cover 420 may be detached from the main cover 410 when the unit battery module 10 is connected to an external device or a plurality of unit battery modules 10 are connected and assembled as a battery pack unit.

Next, a battery pack including the above-described battery module will be described with reference to FIGS. 8 to 12 .

The battery pack according to the present invention may include two or more battery modules disposed in close contact with each other and electrically connected. In the present embodiment, the battery pack is composed of two battery modules, but the battery pack may be composed of three or more battery modules according to its capacity and output.

When configuring a battery pack using the battery module according to the present invention, the battery modules (10a, 10b), as shown in FIG. Remove. When the temporary cover 420 is removed, one end of the positive and negative bus bars 210a and 210b, that is, the extension portion 211 for terminal connection, may be exposed at the corresponding portion.

Hereinafter, the two battery modules will be divided into a first battery module 10a and a second battery module 10b. The first and second battery modules 10a and 10b are initially inactivated as external terminals because the positive and negative terminals 300a and 300b are separated from the positive and negative bus bars 210a and 210b, respectively. Therefore, in order to be assembled as a battery pack unit, electrical connection between the positive terminal 300a and the positive bus bar 210a and the negative terminal 300b and the negative bus bar 210b is absolutely necessary. For the above electrical connection, the battery pack further includes an inter-bus bar 20 .

The inter-bus bar 20 is a metal rod-type conductor and is a component that electrically connects the large-capacity battery module. The inter-bus bar 20 may be formed to have a predetermined thickness according to the magnitude of the current flowing through the battery module. In particular, the inter-bus bar according to the present invention can safely pass a high current between the first and second battery modules 10a and 10b, as well as the positive and negative terminals 300a separated from each of the unit battery modules 10a and 10b. , 300b) and the positive and negative bus bars 210a and 210b to be electrically connected to at least a portion of the terminal connection extension 211 and a portion of the positive terminal 300a and the negative terminal 300b to overlap with each other. It acts as a bridge.

Before explaining the connection structure of the first and second battery modules 10a and 10b by the inter-bus bar 20 in more detail, the positive and negative terminals 300a and the positive and negative electrodes of the unit battery module 10a related thereto The arrangement composition of the bus bars 210a and 210b will be supplemented with reference to FIGS. 2 and 4 again.

The terminal connection extension 211 of the positive and negative bus bars 210a and 210b intersects at least a first section 211a extending straight toward the terminal plate section 310, the first section 211a, and at least A second section 211b extending to correspond to the width of the terminal plate section 310 and a third section 211c crossing the second section 211b and extending away from the terminal plate section 310 are formed. may include

The first section 211a extends from the body of the positive bus bar 210 and the negative bus bar 210 to a position spaced apart from the terminal plate part 310 by a predetermined distance G.

The second section 211b is a portion substantially overlapped with the terminal plate part 310 by an inter-bus bar 20 to be described later. The second section 211b may be formed to correspond to the (horizontal direction) width and thickness of the terminal plate part 310 . Accordingly, the height and width of the second section 211b and the terminal plate part 310 with respect to the sensing board 220 match, so that one surface (front) of the second section 211b and one surface of the terminal plate part 310 ( front) may be located on the same virtual plane. In this case, contact reliability between the inter-bus bar 20 and one surface of the second section 211b and one surface of the terminal plate part 310 may be improved.

The third section 211c is a portion for connection to the printed circuit board 230 . The third section 211c extends downward from the terminal plate part 310 , and an end part 211d thereof penetrates the sensing board 220 and may be connected to the printed circuit board 230 .

The inter-bus bar 20 includes a metal plate-shaped plate-shaped part 21 and two bolt fastening holes 22 provided by drilling the plate-shaped part 21 . As shown in FIG. 10 , the inter-bus bar 20 is bolted to the bolt portions 320 of the negative and positive terminals of the first and second battery modules 10a and 10b. When the holes 22 are inserted and tightened with a nut, they may be connected to the negative terminal 300b of the first battery module 10a and the positive terminal 300a of the second battery module 10b.

At this time, as shown in FIGS. 11 and 12 , the plate-shaped part 21 of the inter-bus bar 20 includes at least the negative terminal 300b of the first battery module 10a and the second of the negative bus bar 210b. The section 211b and the positive terminal 300a of the second battery module 10b and the second section 211b of the positive bus bar 210a may be formed in a size having an area that can be integrally covered.

Therefore, according to the inter-bus bar 20 as described above, the negative terminal 300b and the positive terminal 300a of the first and second battery modules 10a and 10b are connected to each other, and at the same time, the negative terminal of the first battery module 10a is connected. 300b and the negative bus bar 210b, and the positive terminal 300a of the second battery module 10b and the positive bus bar 210a may be electrically connected to each other.

For reference, it may be preferable for safety to assemble the inter-bus bar 20 with the positive terminal of the first battery module and the negative terminal of the second battery module in an inactive state. When the assembly of the inter-bus bar 30 is completed, the temporary covers 420 located on the left side of the first battery module 10a and the right side of the second battery module are removed, respectively, and the bus bar 30 for terminals is assembled. Here, the terminal bus bar includes the positive terminal 300a of the first battery module 10a and the corresponding positive bus bar 210a, and the negative terminal 300b of the second battery module 10b and the corresponding negative bus. It is a component for electrically connecting the bar 210b.

The terminal bus bar 30 may be fastened to the bolt portion 320 of each electrode terminal similarly to the inter-bus bar 20 , and at least an extension portion 211 for terminal connection between the corresponding electrode terminal and the electrode bus bar is provided. It may be formed in a size that can be integrally covered. When the terminal bus bar 30 is attached in this way, the positive terminal 300a of the first battery module 10a and the negative terminal 300b of the second battery module 10b may function as external terminals.

Next, a battery pack to which an inter-bus bar is applied according to other embodiments of the present invention will be described with reference to FIGS. 13 and 14 . The same reference numerals as in the above-described embodiment denote the same members, and a duplicate description of the same members will be omitted, and differences from the above-described embodiments will be mainly described.

The inter-bus bar 20 ′ according to the present embodiment may further include a contact reinforcing part 23 protruding from one surface of the plate-shaped part 21 . Here, the width W of the contact reinforcing part 23 may be determined according to the distance G between the electrode terminals 300a and 300b and the terminal connection extension 211 .

When the inter-bus bar 20' is installed, the contact reinforcement 23 is constrained to the empty space between the positive terminal 300a or the negative terminal 300b and the terminal connection extension 211, as shown in FIG. can be fitted

While the inter-bus bar 20 of the above-described embodiment can only contact the front surface of the terminal plate part 310 and the second section 211b, for example, the inter-bus bar 20' of the present embodiment has the terminal plate part. It is also possible to contact the side surfaces of the 310 and the second section 211b. In addition, in the inter-bus bar 20 of the above-described embodiment, even if there is a slight difference in height between the terminal plate part 310 and the second section 211b, electrical contact between the terminal plate 310 and the second section 211b is maintained. can be incomplete. However, in the inter-bus bar 20' of this embodiment, the contact reinforcement part 23 is press-fitted between the terminal plate 310 and the second section 211b between the terminal plate 310 and the second section 211b. Since it is interposed therebetween, the electrical contact between the terminal plate 310 and the second section 211b may be more stable than that of the inter-bus bar 20 according to the above-described embodiment.

On the other hand, the battery pack according to the present invention, in addition to the above-described battery modules 10, a pack case (not shown) for accommodating these battery modules 10, various devices for controlling the charging and discharging of the battery modules (10) , such as a BMS, a current sensor, a fuse, and the like may be further included.

Of course, the battery pack according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle or an electric power storage device (ESS).

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

On the other hand, when terms indicating directions such as up, down, left, right, front, and back are used in this specification, these terms are only for convenience of description, and depending on the location of the object or the position of the observer, etc. It will be apparent to those skilled in the art that this may vary.

10: battery module 20: inter-bus bar
21: plate-shaped part 23: contact reinforcement part
100: cell assembly 111: electrode lead
120: frame for lamination 121: support
130: end plate 132: side plate
200: sensing assembly 210: bus bar
211: extension for terminal connection 220: sensing board
230: printed circuit board 300a, 300b: positive terminal, negative terminal
310: terminal plate portion 320: bolt portion
400: protective cover 410: main cover
420: temporary cover

Claims (10)

A battery pack comprising two or more battery modules each having secondary batteries stacked in one direction, arranged in close contact with each other, and an inter-bus bar electrically connecting the battery modules,
Each of the battery modules,
a plurality of bus bars electrically connected to electrode leads of the secondary batteries; and a positive terminal and a negative terminal functioning as an external electrode terminal of the battery module,
The two predetermined bus bars among the plurality of bus bars further include an extension part for terminal connection, each of which has one end extending to a position spaced apart from the positive terminal or the negative terminal by a predetermined distance,
The terminal connection extension portion is configured to be non-contact with the corresponding positive terminal or the negative terminal,
The inter-bus bar,
The positive terminal of any one of the battery modules and the extension for connecting the terminals spaced apart from it by a predetermined distance overlap the negative terminal of the other battery module and the extension for connecting the terminals spaced apart from the terminal by a predetermined distance, A battery pack, characterized in that provided for contact. According to claim 1,
The inter bus bar,
and a contact reinforcing part provided to be press-fitted in a space between the positive terminal or the negative terminal and the extension for connecting the terminal. According to claim 1,
Each of the battery modules,
The battery pack further comprising a main cover provided to integrally cover the plurality of bus bars except for the terminal connection extension part. According to claim 1,
The positive terminal and the negative terminal are each
It is disposed on the front part of the battery module and includes a plate-shaped terminal plate part and a bolt part protruding vertically from the terminal plate part,
The battery pack, characterized in that one surface of the extension portion for terminal connection is disposed on the same virtual plane as one surface of the terminal plate portion. 5. The method of claim 4,
The battery pack, characterized in that at least a portion of the terminal connection extension portion is provided to correspond to a width of the terminal plate portion. 6. The method of claim 5,
The extension part for connecting the terminal,
A first section extending straight toward the terminal plate portion, a second section intersecting the first section and extending to at least correspond to a width of the terminal plate section, intersecting the second section and extending away from the terminal plate section comprising a third section,
The second section is electrically connected to the positive terminal or the negative terminal by the inter-bus bar, and the third section has a bent end and is connected to a printed circuit board provided inside the battery module. pack. According to claim 1,
Each of the battery modules,
At least one secondary battery is accommodated inside in the form of a square frame, and further comprising frames for stacking which are respectively erected and stacked in a horizontal direction,
Each of the frames for lamination has a support portion provided with a lower end protruding more in the longitudinal direction than other parts, and a long bolt is inserted into a hole formed in the center region of the support portion of the frames for stacking to be integrally fixedly coupled A battery pack, characterized in that. 8. The method of claim 7,
Each of the battery modules,
Further comprising an end plate provided in the form of a bent plate-shaped body to surround the upper and both sides of the frames for lamination,
The end plate is a battery pack, characterized in that the lower end of the portion surrounding the both side surfaces is fixedly coupled to the support portion of the stacking frame disposed on the outermost side. 8. The method of claim 7,
Each of the battery modules,
The battery pack further comprising: a sensing board that provides a place where the plurality of bus bars, the positive terminal, and the negative terminal can be mounted, is supported by the support part, and is detachably provided on the frames for stacking. An electric vehicle comprising the battery pack according to any one of claims 1 to 9.

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