KR20120108260A - Battery pack of improved safety - Google Patents

Abstract

PURPOSE: A battery pack is provided to improve safety by shutting of a connection circuit of voltage sensing members to a battery pack control part by a safety member in case of short circuit in the battery sensing member. CONSTITUTION: A battery pack(800) comprises: a battery laminate in which a plurality of battery cells or unit modules which are connected in direct and/or in series are laminated; a voltage sensing elements(110,120) electrically connecting the battery pack control part, for detecting voltage of the battery cell or unit module by being electrically connected to an electrode terminal connection part of battery cells respectively located on a front side and/or a backside of the battery laminate; and a safety element shutting off a connection circuit of the voltage sensing member to the battery control part in case of a short circuit in the battery sensing member.

Description

Battery Pack of Improved Safety {Battery Pack of Improved Safety}

The present invention relates to a battery pack having improved safety, and more particularly, a battery cell stack in which a plurality of battery cells or unit modules connected in series and / or in parallel are stacked; It is electrically connected to the electrode terminal connecting portion of the battery cells respectively located on the front and / or rear of the battery cell stack is provided with a connection terminal for detecting the voltage of the battery cell or unit module at the end, and electrically connected to the battery pack controller Connected voltage sensing members; And a safety member for blocking a connection circuit of the voltage sensing members to the battery pack controller when a short circuit occurs in the voltage sensing member.

BACKGROUND ART [0002] In recent years, rechargeable secondary batteries have been widely used as energy sources for wireless mobile devices. In addition, the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (HEV), and the like, which are proposed as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels (Plug-In HEV) and the like.

Small and mobile devices use one or two or four battery cells per device, whereas large and large devices such as automobiles require a large number of battery modules or battery modules electrically connected to a plurality of battery cells due to the need for high output and large capacity. An electrically connected battery pack is used.

Since the battery module is preferably manufactured in a small size and a weight as much as possible, a prismatic battery, a pouch-shaped battery, and the like, which can be charged with a high degree of integration and have a small weight to capacity ratio, are mainly used as battery cells of a middle- or large-sized battery module. In particular, a pouch-type battery using an aluminum laminate sheet or the like as an exterior member has attracted much attention in recent years due to the advantages of low weight and low manufacturing cost.

In addition, since the battery module has a structure in which a plurality of battery cells are combined, when some battery cells are overvoltage, overcurrent, or overheating, the safety and operation efficiency of the battery module are greatly detrimental, so a means for detecting and controlling them is necessary. Do. Therefore, by connecting a voltage sensor or the like to the battery cells to check and control the operation state in real time or at regular intervals, the installation or connection of such a detection means makes the assembly process of the battery module very complicated and multiple wirings for this. There is also a risk of short circuits. In addition, as the secondary battery is used as a power source for automobiles due to the expansion of the application range of the secondary battery, there is a need for a means for maintaining the stable contact state even when a strong shock or vibration is applied.

Meanwhile, in order to use the battery module or the battery pack as a vehicle battery, it is important to measure variables that can confirm the state of the battery and whether it is operating normally. In particular, since voltage and temperature, which are indicators of the electrical state of the battery, are very important, the method of reliably measuring the voltage and temperature of the battery and the safety of the measuring method are very important parts of the battery system.

In addition, in the case of a lithium secondary battery, all voltages of the battery cells must be measured to check the state of each battery cell. Therefore, when a short circuit occurs in the voltage sensing unit, there is a risk factor that causes safety issues of the battery. When such a situation occurs, a method for protecting it is very important in a battery system.

In addition, since the size of the battery pack or the capacity of the battery pack is not relatively large, the conventional battery pack has a simple voltage sensing wiring, and thus the risk of short circuit of the voltage sensing wiring of each battery cell is not high. Therefore, the active protection method that operates the protection circuit through the diagnosis of the battery pack control unit has been mainly used,

However, since a battery pack requiring a large voltage, such as an electric vehicle, is much larger in size and capacity than a conventional battery pack, the voltage sensing wiring is complicated, which increases the risk of the entire battery pack due to a short circuit of the voltage sensing. In the conventional active protection scheme, there is a problem in that all of the short circuit risks of the voltage sensing units are not eliminated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned 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 battery pack including a safety member that can block the connection circuit of the voltage sensing members to the battery pack control unit when a short circuit occurs in the voltage sensing member.

Still another object of the present invention is to provide a battery pack including a voltage sensing member that can be manufactured by a simple assembly method without using a plurality of members for mechanical fastening and electrical connection.

According to an aspect of the present invention, there is provided a battery pack comprising:

A battery cell stack in which a plurality of battery cells or unit modules connected in series and / or in parallel are stacked;

It is electrically connected to the electrode terminal connecting portion of the battery cells respectively located on the front and / or rear of the battery cell stack is provided with a connection terminal for detecting the voltage of the battery cell or unit module at the end, and electrically connected to the battery pack controller Connected voltage sensing members; And

A safety member for blocking a connection circuit of the voltage sensing members to the battery pack controller when a short circuit occurs in the voltage sensing member;

It consists of a structure that includes.

In the conventional battery pack, as shown in FIG. 8, each battery module 26 is electrically connected in series by a bus bar and a wire 22, and the voltage is sensed by using the voltage sensing wiring 24. The structure to detect is taken.

When the capacity of the battery pack increases in the battery pack structure, the number of battery modules constituting the battery pack increases. In this case, the wiring structure of the voltage sensing member for sensing the voltage becomes very complicated because the voltage must be detected for each battery module. In addition, a short circuit occurs frequently in the voltage sensing members due to a complicated wiring structure, and when a short circuit occurs, when the circuit is controlled by using only the battery pack controller 28, there is a problem in that the short circuit cannot be quickly responded to.

In order to solve the above problems, the battery pack of the present invention, by installing a safety member close to the voltage sensing member to cut off the connection circuit of the battery pack control unit and the voltage sensing member in the event of a short circuit in the voltage sensing member By responding quickly to the short circuit of the voltage sensing member can greatly improve the safety of the battery pack.

The short circuit of the voltage sensing members is mainly caused when the wiring harness is barked or cut by an external force, or by a malfunction of the battery pack controller.

In this regard, in the battery pack of the present invention, since a short circuit occurs based on a structure in which a safety member is installed at a portion closest to the voltage sensing member, a method of blocking the connection circuit of the voltage sensing members is taken. It is preferable because safety can be easily ensured without largely changing the battery pack structure.

In one preferred example, the voltage sensing members are connected to a battery management system (BMS) and a wiring harness as a battery pack controller, so that the BMS has a voltage detection value received from the voltage sensing members to facilitate the battery pack. Can be controlled.

The safety member is not particularly limited as long as it blocks a connection circuit of the voltage sensing members to the battery pack controller when a short circuit occurs in the voltage sensing member. However, the safety member may be, for example, a fuse.

Since the fuse is dependent on the voltage specification of the battery pack, it may be appropriately selected in consideration of the fuse application voltage limit of the wiring harness.

In another preferred embodiment, the safety member is located on the connection circuit of the voltage sensing member and the battery pack control, it is possible to easily cut off the electrical connection between the voltage sensing member and the battery pack control when a short circuit occurs in the voltage sensing member.

In the above structure, the safety member may be a structure that is preferably connected on a circuit adjacent to the connection terminal of the voltage sensing member, more preferably may be a structure that is continuously connected to the connection terminal of the voltage sensing member.

Therefore, since the safety member is directly connected to the connection terminal in the voltage sensing member, the safety member can be easily applied without greatly changing the conventional battery pack structure.

Meanwhile, the battery cell stack may have a structure in which a bus bar for connecting an electrode terminal of the battery cell to an external input / output terminal is provided at a front portion thereof.

The battery pack, for example,

An upper case surrounding the one end portion of the battery cell stack, and a part of an upper end and a lower end thereof, the upper case including a mounting part for inserting and mounting the voltage sensing members; And

A lower case having a structure coupled to the upper case while surrounding the other end portion and the upper and lower portions of the battery cell stack, and having an external input / output terminal in a front portion thereof;

It may be a structure including a.

That is, the battery cell stacks in which the electrode terminals are interconnected and filled with high density in the battery pack are vertically mounted to the case of the vertical separation type that is coupled by the prefabricated fastening structure.

The upper and lower cases, in which the battery cell stack is mounted on the upper and lower cases and assembled together with the upper and lower cases, preferably surrounds only the outer circumferential surface of the battery cell stack and its outer surface for easy heat dissipation of the battery cell stack. It consists of a structure exposed to the outside of the case. Therefore, as described above, the upper case is composed of a structure surrounding the battery cell stack one side end and the upper and lower portions, the lower case is made of a structure surrounding the other side end and the upper and lower portions of the battery cell stack. have

In addition, the battery pack according to the present invention is electrically connected to the electrode terminal connection of the battery cells respectively located on the front and rear of the battery cell stack in a state that the voltage sensing member is inserted into the mounting portion located on the front and rear of the upper case It is composed of a structure that, as a whole, the assembly process is simple, has a structure that can be detected compact and stable voltage.

Furthermore, since the member for detecting the voltage of the battery cells is made of a modular voltage sensing member, such a voltage sensing member can be easily mounted on the front and rear of the battery pack, minimizing the intermediate connection of the voltage detection structure The reliability of voltage detection can be improved.

Furthermore, the simplified structure of the voltage sensing member composed of separate independent parts as described above greatly reduces the manufacturing cost and enables outsourcing production, thereby greatly improving the manufacturing productivity of the battery pack.

In addition, when an abnormality occurs in the voltage sensing member, compared to the conventional battery pack structure, only the voltage sensing members mounted on the front and rear of the battery pack are replaced without disassembling the inside of the battery pack, thereby greatly improving the maintainability of the battery pack. .

Since the mounting portions of the voltage sensing members are formed in the upper case, after assembling the battery module, the voltage sensing members may be selectively mounted in the battery pack as needed, and the conventional battery in which the voltage sensing members are mounted inside the lower case. Compared with the pack structure, the structure of the voltage sensing members can be configured more compactly.

The battery cell may be formed of, for example, a plate-shaped battery cell in which electrode terminals are formed at upper and lower ends, respectively.

The voltage sensing member is not particularly limited as long as the voltage sensing member is electrically connected to the electrode terminal connection portions of the battery cells so as to easily detect the voltage of the battery cell or the unit module. The front sensing member connected to the electrode terminal connecting portion positioned, and the rear sensing member connected to the electrode terminal connecting portion located on the rear of the battery cell stack can be made.

Accordingly, the front sensing member and the rear sensing member are simply inserted into the mounting portions of the upper case, respectively, so that the front sensing member and the rear sensing member are electrically connected to the electrode terminal connecting portions located at the front and rear of the battery cell stack.

Preferably, the sensing member is composed of a main body portion each having a hollow connector shape, and a connection terminal connected to a series connection bending portion (electrode terminal connection portion) of the battery cell electrode terminals while inserted into the main body portion. It may be made of a structure.

As one example of the structure, the main body portion has a branched structure in which the lower portion is inserted so that the connection terminal can be inserted for each electrode terminal connection portion, and the connection terminal of the voltage sensing member inserted into the branched structure in the lower portion of the battery cell stack The electrode terminals of the battery cells respectively positioned on the front and rear sides are easily electrically connected.

The number of lower branches of the main body portion of the front sensing member and the rear sensing member may vary depending on the number of unit modules constituting the battery module, a series and / or parallel connection structure of the unit modules, or a shape of a bus bar. In the case of a battery cell stack in which four unit modules (eight battery cells) are stacked in a lateral direction, front sensing is performed so as to be connected to the electrode terminal connecting portions respectively located on the front and rear surfaces of the battery cell stack. The main body portion of the member may be divided into three lower portions, and the main body portion of the rear sensing member may have a structure in which four lower portions are branched.

As another example of the above structure, the connection terminal has a receptacle type structure fitted to the electrode terminal connection portion from the top, so that the connection terminal of the voltage sensing member and the electrode terminal connection of the battery cells are stable even when an external impact is applied. It is desirable because it can maintain an electrical connection.

More preferably, as a safety member, a fuse is mounted in the main body while being connected to the receptacle connection terminal, and thus, electrical connection between the receptacle connection terminal and the battery pack controller can be easily disconnected as necessary, so that voltage sensing is possible. In the event of a short circuit, the battery system can be protected.

On the other hand, in the battery pack between the battery cell or the unit module may be additionally equipped with a temperature measuring sensor for measuring the temperature of the battery cell stack, in this case, by detecting the excessive rise of the temperature, the battery pack Can effectively prevent ignition or explosion.

The temperature measuring sensor may be, for example, a thermistor.

The battery cell stack preferably includes a plurality of unit modules including plate-shaped battery cells in which electrode terminals are formed at upper and lower ends, respectively. The unit module may include two or more battery cells in which electrode terminals are interconnected in series and / or in parallel; And a pair of high-strength cell covers coupled to surround the entire outer surface of the battery cell stack except for the electrode terminal portions of the battery cells.

In the above structure, the structure in which the electrode terminals are interconnected in series is not particularly limited as long as the structure of the electrode terminals is easily connected. For example, the electrode terminals may be directly connected by welding or connected by using a bus bar.

In some cases, a separate terminal may be connected to the electrode terminal or the bus bar in order to increase the reliability of the repeated use of the voltage sensing member. On the other hand, the battery pack according to the present invention has a compact structure as a whole, it is possible to achieve structurally stable mechanical fastening and electrical connection without using a large number of members. In addition, by configuring a battery pack with predetermined units, for example, four, six, eight, ten unit modules or battery modules, the battery pack can be effectively mounted in a limited space as necessary. Can be.

Medium and large battery packs according to the present invention can be manufactured by combining the battery modules according to the desired output and capacity, and considering the mounting efficiency, structural stability, etc. as described above, has a limited mounting space and frequent vibration and strong impact It can be preferably used as a power source of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle to be exposed.

As described above, since the battery pack according to the present invention includes a safety member, when a short circuit occurs in the voltage sensing member, the safety circuit of the battery pack is improved by cutting off the connection circuit of the voltage sensing members to the battery pack controller. You can.

In addition, the voltage sensing member according to the present invention is manufactured by a simple assembly method without using a plurality of members for mechanical fastening and electrical connection, thereby lowering the overall manufacturing cost and stable voltage detection even when a strong shock or vibration is applied from the outside. This is possible.

In addition, the voltage sensing member according to the present invention is composed of a separate independent structure, it is possible to greatly improve the productivity and maintainability in the manufacturing of the battery pack.

1 is a perspective view of a plate-shaped battery cell mounted to the battery module;
2 is a perspective view of a battery module according to an embodiment of the present invention;
3 is an exploded schematic view of the battery module of FIG. 2;
4 is a perspective view of a battery cell stack in the battery module of FIG. 3;
FIG. 5 is a perspective view of a rear sensing member and a temperature measuring sensor for a battery module in the battery module of FIG. 3; FIG.
6 is a perspective view of the front sensing member in the battery module of FIG. 3;
7 is a perspective view of a battery pack according to another embodiment of the present invention;
8 is a schematic diagram of a conventional battery pack.

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 schematically showing one exemplary plate-shaped battery cell mounted to the unit module of the present invention.

Referring to FIG. 1, the plate-shaped battery cell 10 has a structure in which two electrode leads 11 and 12 protrude from each other to protrude from an upper end portion and a lower end portion of the battery main body 13. The exterior member 14 is composed of two upper and lower units, and both side surfaces 14b and the upper end 14a and the lower end, which are mutually contacting portions, with the electrode assembly (not shown) mounted on the receiving portion formed on the inner surface thereof. By attaching 14c, the battery cell 10 is made. The exterior member 14 has a laminate structure of a resin layer / metal foil layer / resin layer, and can be attached by mutually fusion bonding the resin layer by applying heat and pressure to both side surfaces 14b and the upper and lower ends 14a and 14c which are in contact with each other. In some cases, the adhesive may be attached using an adhesive. Since both side surfaces 14b are in direct contact with the same resin layer of the upper and lower exterior members 14, uniform sealing is possible by melting. On the other hand, since the electrode leads 11 and 12 protrude from the upper end 14a and the lower end 14c, the sealing properties are improved in consideration of the thickness of the electrode leads 11 and 12 and the heterogeneity with the material of the exterior member 14. It is comprised by the structure which heat-sealed in the state which interposed the film-like sealing member 16 between the electrode leads 11 and 12 so that it might be possible.

2 is a perspective view schematically showing a battery module according to an embodiment of the present invention, Figure 3 is an exploded schematic view of the battery module of FIG.

4 and 5, which will be described in detail later, the battery module 700 includes a battery cell stack 200, voltage sensing members 110 and 120, and an upper case 300. , And the lower case 400 is configured.

The battery cell stack 200 is stacked in a state in which four unit modules 208 connected in series stand in a lateral direction, and the electrode terminal of the battery cell 220 is connected to the external input / output terminal 402 of the lower case 400. The bus bar 202 for connecting to the front panel is provided at the front side.

The voltage sensing members 110 and 120 are electrically connected to the electrode terminal connecting portions 204 and 206 of the unit modules 208 located at the front and rear surfaces of the battery cell stack 200, respectively. Connection terminals 114 and 124 for detecting the voltage are provided at the lower end.

The voltage sensing members 110 and 120 are provided on the front sensing member 120 electrically connected to the electrode terminal connecting portion 204 located on the front surface of the battery cell stack 200, and on the rear surface of the battery cell stack 200. The rear sensing member 110 is connected to the electrode terminal connecting portion 206 located.

The upper case 300 has a structure surrounding the one side end portion and the upper and lower portions of the battery cell stack 200. The front case 300 includes mounting portions 302 for mounting the voltage sensing members 110 and 120. It is provided in the and back part, respectively.

The lower case 400 is a structure coupled to the upper case 300 and the bolting 306 while surrounding the other end portion and the upper and lower portions of the battery cell stack 200. ) Is provided on the front surface.

In addition, a thermistor, which is a temperature measuring sensor 130 for measuring the temperature of the battery module 700, is mounted between the unit modules 208, and an upper end of the temperature measuring sensor 130 penetrates the upper case 300. It protrudes above the sphere 304.

Therefore, even if the temperature measuring sensor 130 is defective, only the temperature measuring sensor 130 can be replaced without disassembling the battery module 700, and thus the maintenance property is improved as compared with the conventional battery module structure.

4 is a perspective view schematically illustrating a battery cell stack in the battery module of FIG. 3.

Referring to FIG. 4 together with FIG. 3, the battery cell stack 200 includes four unit modules 208 including two plate-shaped battery cells 220 having electrode terminals formed at upper and lower ends thereof, respectively.

The unit module 208 includes two battery cells 220 in which electrode terminals are connected to each other in series and the connecting portion 204 of the electrode terminals is bent to form a stacked structure, and an electrode terminal portion of the battery cells 220. Except for the battery cell stack 200 is composed of a pair of high-strength cell cover 210 is coupled to each other to surround the entire outer surface.

The bus bar 202 is an electrode terminal connecting portion 212 electrically connected to the outermost electrode terminal of the battery module 700 and an input / output terminal connecting portion 214 connected to an external input / output terminal 402 of the lower case 400. consist of.

In addition, the input / output terminal connecting portion 214 is vertically bent in the inward direction of the electrode terminal connecting portion 212 and the battery module 700, and the indented portion 216 is formed in the lower portion, the lower case 400 An external input / output terminal 402 is inserted into the indented portion 216 to facilitate electrical connection with the bus bar 202.

FIG. 5 is a perspective view schematically illustrating a rear sensing member and a temperature sensor for a battery module in the battery module of FIG. 3, and FIG. 6 is a perspective view of the front sensing member in the battery module of FIG. 3. .

4 and 7, the front sensing member 120 and the lower sensing member 110 may include main body parts 112 and 122 having a hollow connector shape, and main body parts 112 and 122. Is connected to the series connection bent portion (electrode terminal connection portion) of the battery cell electrode terminals in the state inserted into the (). That is, the connection terminals 114 and 124 form a structure in which their ends are exposed to the outside through the lower ends of the main body parts 112 and 122 in the state of being inserted into the main body parts 112 and 122.

In addition, the main body portions 112 and 122 have a branched structure at a lower portion thereof so that the connection terminals 114 and 124 can be inserted into the electrode terminal connection portions 204 of the battery cell stack 200, and the connection terminals 114 are connected to each other. , 124 is made of a receptacle structure fitted to the electrode terminal connecting portion from the top.

The main body 122 of the front sensing member 120 has three branches, connected to an electrode terminal connecting portion 204 located at the front of the battery cell stack 220, and the main body of the rear sensing member 110. The lower part 112 is connected to the electrode terminal connection part 206 located at the rear of the battery cell stack 220 because the lower part is branched.

In addition, the safety member 170 is located on the connection circuit of the voltage sensing members 120 and 110 and the battery pack control unit BMS 610, and the connection terminals 124 and 114 of the voltage sensing members 120 and 110. Are connected on a circuit adjacent to

Specifically, the safety member 170 may be continuously connected to the connection terminals 124 and 114 of the voltage sensing members 120 and 110. For example, the safety member 170 may be connected to the fuse as a safety member 170. The body parts 112 and 122 may be mounted in the state of being connected to the terminals 124 and 114.

 7 is a perspective view schematically showing a battery pack according to another embodiment of the present invention.

Referring to FIG. 7, in the battery pack 800, battery modules 700 are stacked in a lateral direction, and the battery modules 700 are voltage sensing members 110 and 120 and temperature measuring sensors 130, respectively. ) Is included.

In addition, the voltage sensing members 110 and 120 and the temperature measuring sensors 130 for the battery module are electrically connected to the BMS 610 by wiring harnesses 150 and 160, respectively.

Furthermore, since the wiring harnesses 150 and 160 are located above the battery pack 800, the wiring harnesses 150 and 160 are connected to the battery pack 800 when an external force such as a vehicle vibration is applied to the battery pack. Effectively prevents damage.

Furthermore, the battery pack 800 includes an air temperature measuring sensor 140 for measuring the air temperature of the refrigerant inlet, thereby measuring not only the temperature of the battery modules 700 but also the air temperature of the refrigerant inlet.

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 (18)

A battery cell stack in which a plurality of battery cells or unit modules connected in series and / or in parallel are stacked;
It is electrically connected to the electrode terminal connecting portion of the battery cells respectively located on the front and / or rear of the battery cell stack is provided with a connection terminal for detecting the voltage of the battery cell or unit module at the end, and electrically connected to the battery pack controller Connected voltage sensing members; And
A safety member for blocking a connection circuit of the voltage sensing members to the battery pack controller when a short circuit occurs in the voltage sensing member;
A battery pack comprising a. The battery pack as claimed in claim 1, wherein the voltage sensing members are connected to a battery management system (BMS) by a wiring harness as a battery pack controller. The battery pack as claimed in claim 1, wherein the safety member is a fuse. The battery pack as claimed in claim 1, wherein the safety member is positioned on a connection circuit between the voltage sensing member and the battery pack controller. The battery pack as claimed in claim 4, wherein the safety member is connected to a circuit adjacent to a connection terminal of the voltage sensing member. The battery pack as claimed in claim 5, wherein the safety member is continuously connected to the connection terminal of the voltage sensing member. The battery pack as claimed in claim 1, wherein the battery cell stack has a bus bar at a front portion thereof for connecting an electrode terminal of the battery cell to an external input / output terminal. The method of claim 1, wherein the battery pack,
An upper case surrounding the one end portion of the battery cell stack, and a part of an upper end and a lower end thereof, the upper case including a mounting part for inserting and mounting the voltage sensing members; And
A lower case having a structure coupled to the upper case while surrounding the other end portion and the upper and lower portions of the battery cell stack, and having an external input / output terminal in a front portion thereof;
Battery pack comprising a. The battery pack as claimed in claim 1, wherein the battery cell is a plate-shaped battery cell in which electrode terminals are formed at an upper end and a lower end, respectively. The method of claim 1, wherein the voltage sensing member comprises a front sensing member connected to the electrode terminal connecting portion located on the front of the battery cell stack, and a rear sensing member connected to the electrode terminal connecting portion located on the rear of the battery cell stack; There is a battery pack characterized in that. The method according to claim 10, wherein the front sensing member and the rear sensing member are formed in a main body portion having a hollow connector shape, and bent in series connection bends (electrode terminal connecting portions) of the battery cell electrode terminals while inserted into the main body portion. A battery pack comprising a connection terminal to be connected. The battery pack as claimed in claim 11, wherein the main body has a branched structure at a lower portion thereof so that the connection terminal can be inserted for each electrode terminal connection portion. 12. The battery pack as claimed in claim 11, wherein the connection terminal has a receptacle type structure fitted to an electrode terminal connection portion from an upper portion thereof. The battery pack according to claim 13, wherein a fuse is mounted in the main body while being connected to the receptacle connecting terminal as a safety member. The battery pack as claimed in claim 1, further comprising a temperature measuring sensor for measuring the temperature of the battery cell stack between the battery cells or the unit module. The battery pack according to claim 15, wherein the temperature measuring sensor is made of a thermistor. The battery cell stack of claim 1, wherein the battery cell stack includes a plurality of unit modules including plate-shaped battery cells having electrode terminals formed on top and bottom thereof, respectively.
Two or more battery cells having electrode terminals interconnected in series and / or in parallel; And
A pair of high-strength cell covers that are coupled to each other to cover the entire outer surface of the battery cell stack except for electrode terminal portions of the battery cells;
Battery pack, characterized in that configured to include. The battery pack according to claim 1, wherein the battery pack is used as a power source for an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle.

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