Battery pack

Disclosed is a battery pack with an improved structure to support a torque applied to a terminal bolt when a nut is coupled to the terminal bolt which is exposed out of the battery pack and serves as a connection terminal. The battery pack includes a cell assembly having a plurality of secondary batteries, a pack housing having an inner space to accommodate the cell assembly therein, a terminal bolt configured to protrude out of the pack housing, a center plate located at an upper portion of the cell assembly in the inner space of the pack housing and having an insert groove formed therein, and a bus bar having one end electrically connected to an electrode terminal of the cell assembly and the other end connected to the terminal bolt by contact, the bus bar being inserted into the insert groove of the center plate.

TECHNICAL FIELD

The present disclosure relates to a battery pack, and more particularly, to a battery pack with an improved structure to support a torque applied to a terminal bolt when a nut is coupled to the terminal bolt which is exposed out of the battery pack and serves as a connection terminal.

The present application claims priority to Korean Patent Application No. 10-2014-0068470 filed on Jun. 5, 2014 in the Republic of Korea, the disclosures of which are incorporated herein by reference.

BACKGROUND ART

Recently, with the active development of electric vehicles, storage batteries, robots, satellites, and the like, along with the dramatically increasing demand for portable electronic products such as laptop computers, video cameras, mobile phones, and the like, research and development for high-performance secondary batteries capable of repeatedly charging and discharging has been actively made.

Currently, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, and the like are used as commercial secondary batteries. Among them, lithium secondary batteries have little to no memory effect in comparison with nickel-based secondary batteries, and thus lithium secondary batteries are gaining a lot of attention for their advantages of free charging or discharging, low self-discharging, and high energy density.

A lithium secondary battery generally uses lithium oxide and carbonaceous material as a positive electrode active material and negative electrode active material, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and an negative electrode plate respectively coated with the positive electrode active material and the negative electrode active material are disposed with a separator being interposed between them, and an exterior, namely a battery case, which seals and accommodates the electrode assembly together with an electrolyte.

Generally, a lithium secondary battery may be classified into a can type secondary battery where the electrode assembly is included in a metal can and a pouch type battery where the electrode assembly is included in a pouch of an aluminum laminate sheet, depending on the shape of the exterior.

In these days, secondary batteries are widely used not only for small-sized devices such as portable electronic devices but also for middle-sized or large-sized devices such as vehicles and power storages. In particular, along with exhaustion of carbon energy and increased interest on environments, the public attention is focused on hybrid vehicles and electric vehicles over the world, including USA, Europe, Japan and Korea. In such hybrid vehicles and electric vehicles, one of the most important parts is a battery pack which gives a driving force to a vehicle motor. A hybrid vehicle or an electric vehicle ensures better fuel efficiency and exhausts no or less pollutant substances since a driving force for a vehicle is obtained by charging/discharging a battery pack. Due to various advantages such as above, more and more vehicle users select such hybrid vehicles and electric vehicles.

A battery pack of the hybrid-electric vehicle or the electric vehicle generally includes a plurality of secondary batteries, and the plurality of secondary batteries are connected to each other in series or in parallel to enhance capacity and output. A general battery pack, for example a battery pack for a vehicle, includes a cell assembly in which a plurality of secondary batteries are stacked, and a pack housing for accommodating the cell assembly in an inner space thereof. In addition, in order to use the battery pack, the battery pack should be electrically connected to an external device by means of a connection member such as a connection wire, and for this connection, a connection terminal may be provided to the battery pack.

The connection terminal may be formed with various shapes. As a representative shape of the connection terminal, a thread may be formed at an outer side of the terminal so that a connection member is coupled to an outer side of the connection terminal, and a coupling member such as a nut is coupled thereon so that the coupled state between the connection terminal and the connection member may be fixed. At this time, since a thread is formed on the outer side of the connection terminal to have a bolt shape, the connection terminal is also called a terminal bolt.

However, a torque may be applied to the terminal bolt while a coupling member such as a nut is being coupled, and the terminal bolt should not be easily damaged or deformed due to the torque. In particular, since a hybrid-electric vehicle or an electric vehicle may be frequently exposed to strong vibrations in use, the coupling member such as a nut should be strongly coupled to the terminal bolt, and thus a stronger torque may be applied to a terminal bolt of a battery pack for a vehicle. Therefore, there is needed a battery pack which is not damaged or deformed by a strong torque. Further, a battery pack used for a vehicle is a middle-sized or large-sized battery pack with high voltage and high capacity. Thus, damage or deformation of the terminal bolt or peripheral parts may lead to more serious damages such as fire, explosion or electric short. Therefore, a battery pack for a vehicle may be regarded as having more strict requirements on torque-related performance for a terminal bolt or the like.

DISCLOSURE

Technical Problem

The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a battery pack, which may effectively prevent damage or deformation of a terminal bolt by improving a structure to support a torque applied to the terminal bolt when a nut is coupled to the terminal bolt; and a vehicle including the battery pack.

Technical Solution

In one aspect of the present disclosure, there is provided a battery pack, which includes a cell assembly having a plurality of secondary batteries; a pack housing having an inner space to accommodate the cell assembly therein; a terminal bolt configured to protrude out of the pack housing; a center plate located at an upper portion of the cell assembly in the inner space of the pack housing and having an insert groove formed therein; and a bus bar having one end electrically connected to an electrode terminal of the cell assembly and the other end connected to the terminal bolt by contact, the bus bar being inserted into the insert groove of the center plate.

Preferably, the bus bar may have a bent portion, and the bent portion may be inserted into the insert groove of the center plate.

Also preferably, the bent portion may be bent in a lower direction, the insert groove of the center plate may be formed in a lower direction, and the bent portion may be inserted into the insert groove in a lower direction from an upper side.

Also preferably, the bent portion may be formed at a terminal of the other end of the bus bar.

Also preferably, the bus bar may have at least two bent portions and at least two insert grooves formed therein.

Also preferably, the terminal bolt may have a cover protrusion inserted into the insert groove together with the bent portion to surround at least a part of the bent portion.

Also preferably, the terminal bolt may have a body, an upper protrusion and a lower protrusion.

Also preferably, a thread may be formed in an outer side of the upper protrusion so that a nut is coupled thereto.

Also preferably, a coupling hole may be formed in the other end of the bus bar, the lower protrusion may be formed at least partially to pass the coupling hole of the bus bar, and a thread may be formed in an outer side of the lower protrusion for the coupling of a nut thereto.

Also preferably, the bus bar may come into contact with at least a part of a lower surface of the body of the terminal bolt and at least a part of a side of the body of the terminal bolt.

Also preferably, the bus bar may be placed on an upper portion of the center plate. Also preferably, at least one of a battery management system (BMS), a current sensor, a relay and a fuse may be mounted to an upper portion of the center plate.

Also preferably, the terminal bolt may protrude out through a through hole of the pack housing, and a sealing member for sealing a space between the terminal bolt and the through hole may be further provided.

In another aspect, of the present disclosure, there is also provided a vehicle, which includes the battery pack according to the present disclosure.

Advantageous Effects

In one aspect of the present disclosure, there is provided a battery pack having an improved structure capable of support a torque applied to a terminal bolt when a coupling member such as a nut is coupled to the terminal bolt by turning.

Therefore, in this aspect of the present disclosure, it is possible to effectively prevent the terminal bolt from being damaged or deformed by a torque.

In particular, a battery pack frequently exposed to strong impacts or vibrations and having high performance, for example a battery pack for a vehicle, has strict requirements on torque-related performance, and the present disclosure may provide a battery pack which may meet such strict torque conditions.

Therefore, in one aspect of the present disclosure, it is possible to prevent the battery pack from breaking down due to damage or deformation of the terminal bolt or peripheral parts due to a torque, and it is also possible to prevent the battery pack from causing fire, explosion or electric short due to such damage or deformation.

BEST MODE

FIG. 1is a perspective view schematically showing a battery pack according to an embodiment of the present disclosure, andFIG. 2is an exploded perspective view showing the battery pack ofFIG. 1.

Also,FIG. 3is a perspective view showing a partial configuration of the battery pack ofFIG. 2, andFIG. 4is an exploded perspective view showing a partial configuration of the battery pack ofFIG. 3.

Referring toFIGS. 1 to 4, a battery pack according to the present disclosure includes a cell assembly100, a pack housing200, a terminal bolt300, a center plate400and a bus bar500.

The cell assembly100includes at least one secondary battery. In particular, in the battery pack, the cell assembly100may be a secondary battery assembly having a plurality of secondary batteries. Here, the plurality of secondary batteries may be pouch-type secondary batteries. In this case, the pouch-type secondary battery may be stacked in one direction, for example in a vertical direction.

Meanwhile, the cell assembly100may include a stacking frame for stacking pouch-type secondary batteries. The stacking frame is a component used for stacking secondary batteries. The stacking frame may hold a secondary battery to prevent its movement, and be configured to be stackable to guide assembling of secondary batteries. The stacking frame may also be called with various terms such as a cartridge and have a rectangular ring shape with a hollow center. In this case, four edges of the stacking frame may be located at an outer circumference of a pouch-type secondary battery.

The pack housing200has a vacant inner space and may accommodate the cell assembly100in the inner space. The pack housing200may play a role of a cladding of a battery pack and thus may give structural stability to the battery pack and protect components such as the cell assembly100accommodated therein against external physical factors such as impacts or materials.

Meanwhile, as shown inFIGS. 1 and 2, the pack housing200may include a lower housing202and an upper housing201. At this time, the lower housing202may be shaped to have an open top and an accommodation space therein, and the upper housing201may be configured to cover an upper open portion of the lower housing202. Here, the upper housing201may also be formed to have a predetermined accommodation space. In addition, after inner components such as the cell assembly100are mostly accommodated in the lower housing202, the upper housing201is coupled to the upper portion of the lower housing202. At this time, rims of the lower housing202and the upper housing201may be coupled to each other by means of coupling members such as bolts.

The terminal bolt300is connected to the cell assembly100and provides a connection terminal so that the cell assembly100is electrically connected to an external device. Generally, the battery pack should include both a positive electrode terminal and a negative electrode terminal as the connection terminal, and thus the terminal bolt300may also include a positive electrode terminal bolt301and a negative electrode terminal bolt302. In addition, the terminal bolt300may be shaped to protrude out of the pack housing200for easier connection with an external device. For this, as shown inFIG. 2, a through hole210may be formed in the pack housing200, particularly in the upper housing201, and a part of the terminal bolt300may be exposed out of the pack housing200through the through hole210.

The center plate400may be configured to have a plate shape with wide upper and lower surfaces. Also, the center plate400may be located at an upper portion of the cell assembly100in the inner space of the pack housing200. In addition, the terminal bolt300may be mounted to the center plate400.

The bus bar500is a component provided between the cell assembly100and the terminal bolt300to electrically connect them to each other. For this, one end of the bus bar500may be electrically connected to an electrode terminal110of the cell assembly100, and the other end of the bus bar500may be connected to the terminal bolt300by direct contact.

In particular, the electrode terminal110of the cell assembly100may include a positive electrode assembly terminal111and a negative electrode assembly terminal112, and the terminal bolt300may also include a positive electrode terminal bolt301and a negative electrode terminal bolt302. For this reason, the bus bar500may also include a positive electrode bus bar501and a negative electrode bus bar502. In this case, the positive electrode bus bar501may electrically connect the positive electrode assembly terminal111to the positive electrode terminal bolt301, and the negative electrode bus bar502may electrically connect the negative electrode assembly terminal112to the negative electrode terminal bolt302. As described above, the bus bar500is a component for electrical connection and thus may be made of material with electric conduction. In particular, in order to ensure mechanical strength to some extent, the bus bar500may be made of metallic material such as copper.

Meanwhile, there may be provided two or more positive electrode bus bars501or two or more negative electrode bus bars502. For example, as shown inFIG. 2, the positive electrode bus bar501may be composed of four unit bus bars500, and the negative electrode bus bar502may be composed of a single unit bus bar500. Here, four positive electrode unit bus bars500may be directly connected to each other or connected to each other by means of an electric part such as a current sensor, a relay, a fuse or the like.

As described above, the terminal bolt300may be electrically connected to the cell assembly100to serve as an outer terminal of the battery pack and be configured to be connected to an external device such as a motor or a charger in order to charge or discharge secondary batteries provided at the cell assembly100. At this time, an external device may be directly connected to the terminal bolt300, or a connection member for connecting an external device may be connected thereto.

Here, a nut may be coupled to the terminal bolt300in order to facilitate easier connection to such an external device or such a connection member and also to ensure secure fixation in a connected state.

FIG. 5is a schematic enlarged view showing a partial configuration where a single terminal bolt300is located at a battery pack according to an embodiment of the present disclosure,FIG. 6is an exploded perspective view schematically showing a partial configuration of the battery pack where the terminal bolt300depicted inFIG. 5is located,FIG. 7is a top view ofFIG. 5, andFIG. 8is a cross-sectional view, taken along the line A-A′ ofFIG. 7.

Referring toFIGS. 5 to 8, a nut may be coupled to the terminal bolt300, and for coupling the nut, a thread may be formed in at least a part of the terminal bolt300. In this case, the nut may be coupled to the terminal bolt300by turning as indicated by an arrow inFIG. 5.

In particular, in the battery pack according to the present disclosure, as indicated by C1inFIG. 8, at least a part of the bus bar500may be configured to be inserted into and coupled to the center plate400. In other words, the terminal bolt300and the bus bar500may be placed on the center plate400, and at this time, an insert groove420may be formed in the center plate400. In addition, a part of the bus bar500may be inserted into the insert groove420of the center plate400.

In this configuration of the present disclosure, the bus bar500inserted into the center plate400may support and relieve the torque applied to the terminal bolt300. In other words, as shown inFIG. 5, when the nut is coupled to the terminal bolt300and turned, a torque may be applied to the terminal bolt300. At this time, if the bus bar500is inserted into and coupled to the center plate400as described above, the coupled structure of the bus bar500and the center plate400prevents the terminal bolt300from turning and also absorbs a part of the torque applied to the terminal bolt300to distribute and weaken the torque. Therefore, in this aspect of the present disclosure, even though a strong torque is applied to the terminal bolt300, it is possible to prevent the terminal bolt300and peripheral parts from being damaged or deformed.

In particular, as shown inFIGS. 6 and 8, the bus bar500may include a bent portion510which is partially bent. In addition, the bent portion510of the bus bar500may be inserted into the insert groove420of the center plate400so that the bus bar500is inserted into and coupled to the center plate400.

Preferably, the bent portion510of the bus bar500may be bent in a lower direction as shown in the figure. In addition, the insert groove420of the center plate400may also be formed in a lower direction in the upper surface of the center plate400, corresponding to the shape of the bent portion510. In this case, since the bent portion510of the bus bar500is inserted into the insert groove420of the center plate400at an upper portion of the center plate400, the bus bar500may be inserted into and coupled to the center plate400.

In this embodiment, in order to insert the bent portion510of the bus bar500into the insert groove420of the center plate400, the bus bar500is placed on the upper portion of the center plate400and also the bent portion510is positioned to be fit into the insert groove420. In this case, the bus bar500may be assembled to the center plate400in a simple way.

Also preferably, the bent portion510may be formed at a terminal of the other end of the bus bar500. In other words, referring toFIG. 8, the bus bar500may be configured to elongate in a right direction at a left side so that the terminal bolt300may come into contact with and be coupled to a right end thereof. At this time, a tip of the right end of the bus bar500, namely a right tip, may be bent in a lower direction, and the right tip may serve as the bent portion510and be inserted into the insert groove420of the center plate400.

As described above, if the bent portion510is formed at a terminal of the bus bar500, the bent portion510of the bus bar500may be easily assembled to the center plate400, and thus the battery pack may be manufactured within a shorter time.

However, the present disclosure is not limited to the above configuration, and the bent portion510may also be formed at a predetermined intermediate point, instead of a terminal of the bus bar500. For example, the bus bar500may extend in a right direction at a left side so that its right end is coupled to the terminal bolt300, and a protrusion, or a U-shaped bent portion510, may be formed at a left portion of the terminal bolt300. Also, the insert groove420may be formed at a portion of the center plate400corresponding to the protrusion. In this case, the protrusion, or the U-shaped bent portion510, may be inserted into the insert groove420.

Meanwhile, in the battery pack according to the present disclosure, as described inFIG. 8, the terminal bolt300may include a body310, an upper protrusion320and a lower protrusion330.

Here, the body310may be a component which comes into direct contact with the bus bar500. For example, as shown inFIG. 8, the terminal bolt300may be configured so that a lower portion of the body310comes into contact with the upper portion of the bus bar500. Thus, the body310of the terminal bolt300may be regarded as a portion directly connected to the bus bar500.

The upper protrusion320may be configured to protrude upwards on the body310of the terminal bolt300, and as shown inFIG. 8, a nut N1may be coupled thereto. In addition, the upper protrusion320may be at least partially exposed out of the pack housing200through the through hole210of the pack housing200. Meanwhile, a thread may be formed in an outer surface of the upper protrusion320so that the nut N1may be coupled thereto. In addition, an external device or a connection member for connection with the external device may be connected to the upper protrusion320, in addition to the nut N1.

The lower protrusion330may be configured to protrude in a lower direction at the body310of the terminal bolt300. In addition, the lower protrusion330may be coupled to the bus bar500at least partially through the bus bar500. For this, as shown in the figure, a coupling hole520may be formed at the other end of the bus bar500which comes in contact with the terminal bolt300, and the lower protrusion330may be configured through the coupling hole520of the bus bar500.

Here, in order to reinforce a coupled state between the terminal bolt300and the bus bar500coupled to each other, a thread may be formed in an outer surface of the lower protrusion330, and the lower protrusion330may be coupled and fixed to a nut N2by using the thread. In this configuration of the present disclosure, since the bus bar500is interposed between the body310of the terminal bolt300and the nut N2, the coupled state between the bus bar500and the terminal bolt300may be secured.

Here, two or more lower protrusions330may be provided at the terminal bolt300. In addition, corresponding to such a plurality of lower protrusions330, a plurality of coupling holes520may be formed in the bus bar500. In this configuration of the present disclosure, when a single terminal bolt300and a single bus bar500are coupled, a plurality of lower protrusions330and a plurality of coupling holes520are coupled, which ensures more secure coupling between the terminal bolt300and the bus bar500and also more effectively supports the torque applied to the terminal bolt300.

Preferably, the bus bar500may be configured to come into contact with at least a part of the lower surface of the body310of the terminal bolt300and at least a part of the side of the body310of the terminal bolt300. In other words, the bus bar500is mounted to the upper portion of the center plate400so that its flat portions are oriented in upper and lower directions, and the body310of the terminal bolt300is placed on the upper portion thereof. Therefore, as indicated by C2inFIG. 8, the bus bar500may come into contact with the lower portion of the body310.

In addition, as indicated by C3inFIG. 8, the bus bar500may be configured to come into contact with at least a part of the side of the body310. For this, the bus bar500may be bent at a lower tip of the body310to surround at least a part of the side of the body310. In this case, the bus bar500may come into contact with the side of the body310as well as the lower portion of the body310.

In this configuration of the present disclosure, since a contact surface area between the bus bar500and the terminal bolt300increases, the bus bar500and the terminal bolt300may be electrically connected more stably, and an electric resistance may be reduced at a connection portion thereof. Moreover, since the bus bar500is configured to surround the side of the body310, when the nut N1is coupled to the upper protrusion320of the terminal bolt300and turned, the torque applied to the terminal bolt300may be supported and distributed.

Preferably, in the battery pack according to an embodiment of the present disclosure, the terminal bolt300may include a sealing member.

The sealing member is a component for sealing a space between the terminal bolt300and the through hole210so that the space may be closed. For example, the terminal bolt300may have an O-ring shaped sealing member at a portion indicated by S inFIG. 8. In addition, when the upper protrusion320of the terminal bolt300passes through the through hole210of the pack housing200, the sealing member may seal the space between the body310of the terminal bolt300and the through hole210.

In this configuration of the present disclosure, due to the sealing member, it is possible to prevent a gas generated in the battery pack from discharging out through a gap between the terminal bolt300and the pack housing200. In addition, it is also possible to prevent external moisture or impurities from penetrating into the battery pack through such a gap.

Meanwhile, the bus bar500may be placed on the upper portion of the center plate400. The center plate400may be located at the upper portion of the cell assembly100inside the pack housing200. At this time, the center plate400may be coupled to the upper portion of the cell assembly100by using a coupling member such as a bolt. In addition, as shown inFIGS. 6 and 8, a placing portion is formed at the center plate400so that the bus bar500may be placed thereon, and the bus bar500may be placed on the placing portion of the center plate400. In particular, as indicated by C3inFIG. 8, the bus bar500may be partially bent, and the placing portion of the center plate400may be shaped corresponding to the bent shape of the bus bar500. Further, the bus bar500may be bent again at an inner side of the portion indicated by C3(a left side inFIG. 8), and in this case, the center plate400may also have a placing portion shaped corresponding to such a double-bent shape. In this configuration of the present disclosure, rigidity and mechanical supporting force of the bus bar500may be reinforced, and the torque applied to the terminal bolt300may be supported more strongly.

Preferably, as shown inFIGS. 3 and 4, electric parts, such as a battery management system (BMS)411, a current sensor412, a relay413and a fuse414may be mounted to the upper portion of the center plate400.

Here, the BMS (Battery Management System)411represents a battery management unit for controlling charging/discharging operations of a battery pack as a whole, and the BMS411may be generally regarded as a component included in a battery pack.

In addition, the current sensor412senses a charging/discharging current of the battery pack, and the relay413is a switching unit for selectively opening or closing a charging/discharging path on which a charging/discharging current of the battery pack flows. In addition, the fuse414is provided on the charging/discharging path of the battery pack and serves as a component for blocking the charging/discharging current by fusing off when an abnormal situation occurs at the battery pack. The current sensor412, the relay413and the fuse414may exchange information with the BMS411and be controlled by the BMS411.

Also preferably, two or more bent portions510and two or more insert grooves420may be formed. This will be described below in more detail with reference toFIGS. 9 and 10.

FIG. 9is a perspective view schematically showing an end portion of a bus bar500according to another embodiment of the present disclosure, which is observed from the below, andFIG. 10is a top view schematically showing that the bus bar500ofFIG. 9is coupled to a center plate400.

First, referring toFIG. 9, the bus bar500may have a plurality of bent portions510, for example three bent portions510. In addition, among these three bent portions510, one bent portion510may be provided at a terminal of the other end (a right end onFIG. 9) of the bus bar500and two bent portions510may be provided to both sides thereof, each by each. In particular, all of the bent portions510may be shaped to be bent in a lower direction.

When the bus bar500is coupled to the center plate400, these three bent portions510may be located at portions indicated by D1, D2and D3inFIG. 10. In addition, corresponding to the shape of the bent portion510of the bus bar500, the center plate400may include a plurality of insert grooves420, namely three insert grooves420. Therefore, the insert grooves420of the center plate400may be formed at the portions indicated by D1, D2and D3inFIG. 10. Therefore, in this configuration of the present disclosure, the bent portions510of the bus bar500may be inserted into the insert grooves420of the center plate400at three locations indicated by D1, D2and D3inFIG. 10.

As in this embodiment, if a plurality of bent portions510and a plurality of insert grooves420are formed, the torque may be more strongly supported due to the coupling between the bent portions510and the insert grooves420. In other words, since the coupled configuration of the plurality of bent portions510and the plurality of insert grooves420distributes and supports the torque applied to the terminal bolt300, the torque applied to the terminal bolt300may be supported more strongly, and the force applied to the bus bar500and the center plate400is distributed, thereby more effectively preventing the bus bar500, the center plate400and the terminal bolt300from being damaged or deformed due to the torque.

FIG. 11is a cross-sectional view schematically showing that a bus bar500according to another embodiment of the present disclosure is coupled to a terminal bolt300. In particular, the configuration ofFIG. 11may be regarded as another embodiment ofFIG. 8.

Referring toFIG. 11, in the battery pack according to the present disclosure, the terminal bolt300may have a cover protrusion340. The cover protrusion340is configured to protrude in a predetermined direction on a part of the terminal bolt300to surround the terminal of the bus bar500. In particular, as shown inFIG. 1, if the right tip of the bus bar500is bent in a lower direction and the bent portion510is inserted into the insert groove420of the center plate400, the cover protrusion340may be formed on a lower portion of the right side of the body310of the bus bar500to protrude in a lower direction, and the cover protrusion340may surround the right tip of the bus bar500, namely the bent portion510of the bus bar500, an outer side (a right side inFIG. 11). At this time, the cover protrusion340of the terminal bolt300may also be inserted into the insert groove420of the center plate400together with the bent portion510of the bus bar500.

In this embodiment of the present disclosure, since the cover protrusion340of the terminal bolt300is inserted into the center plate400while surrounding the bus bar500, the torque applied to the terminal bolt300when the nut N1is coupled may be supported, thereby relieving the torque applied to the terminal bolt300. Moreover, since a contact area between the terminal bolt300and the bus bar500increases, an electric connection may be stably maintained, and an electric resistance may be reduced.

The battery pack according to the present disclosure may be applied to a vehicle such as an electric vehicle and a hybrid-electric vehicle. In other words, the vehicle according to the present disclosure may include the battery pack as described above. In particular, in the battery pack according to the present disclosure, even though strong vibrations and impacts are frequently applied while the vehicle is running, the torque applied to the terminal bolt300is supported due to various structures. Therefore, it is possible to prevent the terminal bolt300and various peripheral parts such as the bus bar500from being broken down, damaged or deformed due to the torque.

Meanwhile, the terms indicating up, down, left and right directions are used in the specification, but it is obvious to those skilled in the art that these merely represent a relative location and may vary based on a location of an observer or a shape in which an object is placed.