KR102332333B1 - Battery pack - Google Patents

Abstract

The present invention discloses a battery pack. The battery pack provides an accommodating space for accommodating a battery cell including first and second ends opposite to each other along a longitudinal direction, and a cooling fluid for cooling the battery cell together with the battery cell, A case including first and second covers formed to cover the first and second ends of the battery cells, respectively, and disposed on the first and second covers and electrically connected to the first and second ends of the battery cells 1 . A circuit board comprising: first and second tab plates to be formed; a circuit board disposed on the first tab plate; and first and second leads for mediating an electrical connection between the first and second tab plates and the circuit board; The first and second leads are connected together to the first side of the circuit board.
According to the present invention, there is provided a battery pack in which an arrangement structure of a lead electrically connected to an electrode of a battery cell is improved, and heat dissipation performance of a switch element is improved by using a flow of a cooling fluid accommodated together in an accommodating space of the battery cell. .

Description

battery pack {Battery pack}

The present invention relates to a battery pack.

In general, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supply, etc. It is also used in the form of a pack bundled as a unit by connecting the batteries of

Small mobile devices such as cell phones can be operated for a certain period of time with the output and capacity of a single battery. A pack type including batteries is preferred, and the output voltage or output current can be increased according to the number of built-in batteries.

One embodiment of the present invention includes a battery pack in which an arrangement structure of a lead electrically connected to an electrode of a battery cell is improved.

One embodiment of the present invention includes a battery pack in which heat dissipation performance of a switch element is improved by using a flow of a cooling fluid accommodated together in an accommodating space of a battery cell.

In order to solve the above problems and other problems, the battery pack of the present invention,

a battery cell including first and second ends opposite to each other along a length direction, respectively;

a case that provides an accommodation space for accommodating a cooling fluid for cooling the battery cell together with the battery cell, the case including first and second covers formed to cover the first and second ends of the battery cell, respectively;

first and second tab plates disposed on the first and second covers and electrically connected to the first and second ends of the battery cells;

a circuit board disposed on the first tab plate; and

and first and second leads for mediating an electrical connection between the first and second tab plates and the circuit board, wherein the first and second leads are connected together to the first side of the circuit board.

For example, the first side portion of the circuit board may extend linearly in one direction and correspond to an edge portion of the continuously extending circuit board.

For example, the first and second leads may not be connected to a second side opposite to the first side of the circuit board.

For example, the first and second leads may include a plurality of first and second leads extending from the plurality of first and second tab plates.

For example, the first and second leads may be connected in a row along a first edge of the circuit board.

For example, a first lead may be interposed between adjacent second leads, and a second lead may be interposed between adjacent first leads so that the first and second leads are arranged in an alternating pattern. have.

For example, the second lead may extend longer than the first lead.

For example, the second lead may extend across the side surface of the case from the second cover side toward the first cover side.

For example, the second lead may include a bent portion to bypass the welding portion protruding from the side surface of the case.

For example, the first and second leads may be alternately arranged along the long side direction of the first and second covers.

For example, the first and second tab plates are arranged in an alternating pattern along the long side direction of the first and second covers to connect different pairs of battery cells on the first and second covers,

The first and second leads may extend from each of the first and second tab plates and may be arranged in an alternating pattern along the long sides of the first and second covers.

For example, the first and second leads are intensively arranged on the side of the first long side of the first and second covers, and on the side of the second long side opposite to the first long side of the first and second covers. may not be placed.

For example, a switch element may be disposed between the second long side of the first cover and the second long side of the second cover.

For example, the case further includes a middle case interposed between the first and second covers,

A switch element may be disposed on the middle case close to the second long sides of the first and second covers.

On the other hand, the battery pack according to another aspect of the present invention,

multiple battery cells;

a case providing an accommodating space for accommodating a cooling fluid for cooling the battery cell together with the battery cell;

a partition wall extending across the receiving space and dividing the receiving space into an upstream part connected to an inlet of the cooling fluid and a downstream part connected to an outlet of the cooling fluid; and

and a switch element disposed on one side of the case facing the partition wall.

For example, the partition wall may further include a communication part connecting the upstream part and the downstream part to each other.

For example, the inlet and the outlet are formed on one end side of the case along the extension direction of the partition wall,

The communication part may be formed on the other end side of the case opposite to the one end side of the case.

For example, the switch element may be disposed on the side of the long side of the case formed along the extending direction of the partition wall.

For example, the case is

first and second covers formed to cover first and second ends opposite to each other along the length direction of the battery cells, respectively; and

It may include a middle case interposed between the first and second covers.

For example, a coupling position of the inlet and the outlet and the partition wall is formed on the short side of the middle case,

The switch element may be disposed on the long side of the middle case.

According to the present invention, by improving the arrangement structure of the lead electrically connected to the electrode of the battery cell, welding workability for connecting the lead can be improved, and a battery pack can be provided in which the circuit structure can be simplified. .

According to the present invention, it is possible to provide a battery pack in which the heat dissipation performance of a switch element capable of intermittently intermitting the flow of charge/discharge current on a large current path by using the flow of the cooling fluid accommodated in the accommodating space of the battery cell is improved.

1 is an exploded perspective view of a battery pack according to an embodiment of the present invention.
2A and 2B are diagrams illustrating electrical connections of the battery cells shown in FIG. 1 .
3A and 3B are views showing a cooling structure of a switch element according to another embodiment of the present invention.
4 is an exploded perspective view of a housing for accommodating the core pack shown in FIG. 2B according to another embodiment of the present invention.
5 is an exploded perspective view of the case shown in FIG. 1 .
FIG. 6 is a view showing a flow of a cooling fluid formed inside the case shown in FIG. 5 .
7A and 7B are an exploded perspective view and a plan view of the first cover shown in FIG. 1 .
FIG. 8 is a perspective view taken along line VIII-VIII of FIG. 1 .
9A and 9B are cross-sectional views illustrating a modified embodiment of the first sealing member shown in FIG. 8 .
FIG. 10 is a diagram showing an arrangement of the battery cells shown in FIG. 1 .
11 is a perspective view illustrating a stepped space of the battery pack shown in FIG. 1 .
FIG. 12 is a perspective view taken along line XII-XII of FIG. 11 , and is a view for explaining gas discharge of a battery cell using a stepped space.
13 is a perspective view of the first tab plate shown in FIG. 11 .

Hereinafter, a battery pack according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

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

Referring to the drawings, the battery pack of the present invention includes a plurality of battery cells 10 and an accommodating space A for accommodating a cooling fluid for cooling the battery cells 10 together with the battery cells 10 . It may include a case 100 to provide.

The case 100 may include a middle case 100c and first and second covers 100a and 100b coupled to face each other with the middle case 100c interposed therebetween. The first and second covers 100a and 100b may cover the first and second ends 11 and 12 corresponding to both ends of the battery cell 10 in the longitudinal direction of the battery cell 10 , respectively. have.

First and second terminal holes 101 ′ and 102 ′ for exposing the first and second ends 11 and 12 of the battery cell 10 are formed in the first and second covers 100a and 100b . The electrical connection of the battery cells 10 through the first and second ends 11 and 12 of the battery cells 10 exposed from the first and second terminal holes 101 ′ and 102 ′ may be can be done

2A and 2B are diagrams illustrating electrical connections of the battery cells shown in FIG. 1 .

Referring to FIG. 2A , a first tab plate 110a for electrical connection with the first end 11 of the battery cell 10 may be disposed on the first cover 100a, and the second cover 100b). A second tab plate 110b for electrical connection with the second end 12 of the battery cell 10 may be disposed thereon. A circuit board 180 may be disposed on the first tab plate 110a , and first and second tab plates 110a and 110b may be connected to the circuit board 180 .

Referring to FIG. 2B , a first lead 120a for mediating an electrical connection between the circuit board 180 and the first tab plate 110a may be interposed between the circuit board 180 and the circuit board 180 . A second lead 120b for mediating an electrical connection therebetween may be interposed between the second tab plate 110b and the second tab plate 110b. The first and second leads 120a and 120b transmit state information, for example, voltage information, of the battery cell 10 transmitted through the first and second tab plates 110a and 110b to the circuit board 180 . ), it is possible to provide basic information for controlling the charging and discharging operations of the battery cell 10 .

The circuit board 180 is disposed on the first tab plate 110a and disposed at a position relatively close to the first tab plate 110a, while being relatively far from the second tab plate 110b. Therefore, the second lead 120b needs to extend a relatively longer distance than the first lead 120a. That is, since the second lead 120b extends from the second tab plate 110b on the side of the second cover 100b to the circuit board 180 on the side of the first cover 100a, it is larger than the first lead 120a. It can be extended relatively long. In this case, the second lead 120b includes a bent portion 125 to bypass the laser welding portions L1 and L2 protruding from the side surface of the case 100 while extending across the side surface of the case 100 . can do. The bent portion 125 avoids physical interference with the laser welding portions L1 and L2 protruding from the side surface of the case 100 , while the second lead 120b is closely supported with respect to the side surface of the case 100 . By extending in the state, the second lead 120b can be stably supported, and electrical interference with the first lead 120a and the like due to unstable floating of the second lead 120b is avoided. Here, the case 100 includes first and second covers 100a and 100b covering the first and second ends 11 and 12 of the battery cell 10 , and the first and second covers 100a. , 100b) may include a middle case (100c) interposed therebetween, the middle case (100c) formed of different members, respectively, and the first and second covers (100a, 100b) sealed by the coupling of the receiving space (A) may be provided. At this time, the laser welding parts (L1, L2) may mean the first and second laser welding parts (L1, L2) for airtightly coupling between the first and second covers (100a, 100b) and the middle case (100c). have.

The first and second leads 120a and 120b are formed as separate members from the first and second tab plates 110a and 110b, and then are welded to the first and second tab plates 110a and 110b. can For example, coupling portions 121a and 121b with the first and second tab plates 110a and 110b may be formed at one end of the first and second leads 120a and 120b, and the first, Connections 122a and 122b to the circuit board 180 may be formed at the other ends of the second leads 120a and 120b. In one embodiment of the present invention, coupling portions 121a and 121b formed at one end of the first and second leads 120a and 120b, and connecting portions formed at the other end of the first and second leads 120a and 120b All of 122a and 122b may be formed by welding.

If the first and second leads 120a and 120b are not formed as separate members from the first and second tab plates 110a and 110b, but are formed integrally with the first and second tab plates 110a and 110b In order to do this, the material cost increases due to metal scrap wasted during cutting of the raw material metal plate. In particular, in order to form the second lead 120b having a relatively long distance integrally with the second tab plate 110b, waste There is a problem in that the amount of metal scrap to be used is excessive, which puts a burden on material costs. In addition, since the convenience of the bending operation can be improved by performing bending on the second lead 120b separate from the second tab plate 110b, at least the second lead 120b is the second tab plate. It may be formed as a separate member from 110b.

In another embodiment of the present invention, the first lead 120a having a relatively short distance may extend from the first tab plate 110a in an integrally bent form, and the second lead 120a having a relatively long distance may be formed. 120b may be formed as a member separate from the second tab plate 110b and then welded to the second tab plate 110b.

The first lead 120a may include a plurality of first leads 120a extending from the plurality of first tab plates 110a. Similarly, the second lead 120b may include a plurality of second leads 120b extending from the plurality of second tab plates 110b. The first and second leads 120a and 120b may be interposed between adjacent second leads 120b so that they are arranged in an alternating pattern, and the second leads ( 120b) may be interposed between adjacent first leads 120a. As such, the first and second leads 120a and 120b are arranged in a column in an alternating pattern, so that electrical interference between the first and second leads 120a and 120b can be avoided, and the Electrical insulation can be ensured.

The first and second leads 120a and 120b may be intensively disposed on the first long side portion 100L1 side of the first and second covers 100a and 100b. For example, when the first and second covers 100a and 100b include first and second long sides 100L1 and 100L2 positioned on opposite sides of each other, the first and second leads 120a, 120b) may be intensively arranged on the side of the first long side portion 100L1 of the first and second covers 100a and 100b, and the second long side portion 100L2 positioned on the opposite side to the first long side portion 100L1. ) may not be placed on the side. In this case, the first long side portions 100L1 of the first and second covers 100a and 100b may be in contact with the same side surface of the case 100 , for example, the same side surface of the middle case 100c.

In one embodiment of the present invention, coupling portions 121a and 121b formed at one end of the first and second leads 120a and 120b, and connecting portions formed at the other end of the first and second leads 120a and 120b All of 122a and 122b may be formed of a welding part, and more specifically, may be formed of a laser welding part. At this time, the first and second leads 120a and 120b are intensively disposed on the first long side portion 100L1 side of the first and second covers 100a and 100b, thereby improving the workability of laser welding. There is no need to change the laser irradiation position from the first long side portion 100L1 to the second long side portion 100L2 during laser welding or change the positions of the first and second covers 100a and 100b.

In the embodiment shown in FIG. 2B , the switch element 185 for intermitting the flow of charge/discharge current may be mounted on the circuit board 180 disposed on the side of the first cover 100a. In the present invention, the switch element 185 may be disposed in various places. In the embodiment shown in FIG. 3A , the switch element on the second long side portion 100L2 side of the first and second covers 100a and 100b. (185) can be placed. In this embodiment, by intensively arranging the first and second leads 120a and 120b on the first long side portion 100L1 side of the first and second covers 100a and 100b, the first and second covers A mounting space for disposing the switch element 185 may be provided on the side of the second long side 100L2 of the (100a, 100b), for example, the second long side 100L2 of the first cover 100a. ) and the second long side portion 100L2 of the second cover 100b, the switch element 185 may be disposed. More specifically, the switch element 185 is disposed on the middle case 100c on the second long side portion 100L2 side, thereby improving cooling performance of a heat generating component such as the switch element 185 . This will be described in more detail later.

In one embodiment of the present invention, the first tab plate 110a may connect the first ends 11 of the first and second battery cells 10a and 10b having opposite polarities in series, and The second tab plate 110b may connect the second ends 12 of the first and second battery cells 10a and 10b having opposite polarities in series. In this case, the first and second tab plates 110a and 110b are zigzag to connect different pairs of first and second battery cells 10a and 10b on the first and second covers 100a and 100b. They may be alternately arranged in a pattern, and accordingly, the first and second leads 120a and 120b extending from the first and second tab plates 110a and 110b may also be arranged in an alternating pattern. For example, the first and second tab plates 110a and 110b may be alternately arranged along the direction of the first long side portion 100L1 of the first and second covers 100a and 100b, and the The first and second leads 120a and 120b extending from the first and second tab plates 110a and 110b are also along the first long side portion 100L1 of the first and second covers 100a and 100b. They may be arranged alternately with each other.

The first and second leads 120a and 120b are disposed on the first long side portion 100L1 side of the first and second covers 100a and 100b, so that one of the first and second leads 120a and 120b is disposed. The connecting portions 122a and 122b of the first and second leads 120a and 120b that form end portions may be connected to the first side portion 181 of the circuit board 180 . That is, on the first side portion 181 of the circuit board 180 , the connection portions 122a and 122b of the plurality of first and second leads 120a and 120b may be arranged in a row. The fact that the connecting portions 122a and 122b of the first and second leads 120a and 120b are arranged in a row means that the connecting portions 122a and 122b of the first and second leads 120a and 120b do not overlap each other and do not overlap each other on the circuit board. It may mean that it is arranged along one direction along the first edge 181 of 180 . Here, the first edge portion 181 of the circuit board 180 may correspond to an edge portion of the circuit board 180 continuously extending while linearly extending in one direction, and the edge portion extending in different directions. may not be included. In one embodiment of the present invention, the first and second leads 120a and 120b may be intensively connected to the first edge 181 of the circuit board 180 , and the first edge of the circuit board 180 . It may not be connected to the second side 182 opposite to 181 .

In this way, the connecting portions 122a and 122b of the first and second leads 120a and 120b are intensively connected to the same first side portion 181 of the circuit board 180, so that the first and second leads 120a and 120b are intensively connected to each other. The conductive path of the circuit board 180 connected to 120b) may be shortened. For example, by forming a position of a processing circuit for processing data transmitted through the first and second leads 120a and 120b close to the first edge 181 side of the circuit board 180, the conductive path length can be shortened.

The connecting portions 122a and 122b of the first and second leads 120a and 120b may be arranged in an alternating pattern along the first edge 181 of the circuit board 180 . The connecting portions 122a and 122b of the first and second leads 120a and 120b form ends of the first and second leads 120a and 120b, and the first and second leads 120a and 120b are alternated. As a result of being arranged in a pattern in which the first and second leads 120a and 120b are connected, the connecting portions 122a and 122b of the first and second leads 120a and 120b may be arranged in an alternating pattern along the first edge 181 of the circuit board 180 .

The circuit board 180 receives the state information of the battery cell 10 transmitted from the first and second leads 120a and 120b, and charges and discharges the battery cell 10 based on the received state information. You can control the action. The circuit board 180 may be formed on the first tab plate 110a and may be disposed on the first cover 100a side. That is, the circuit board 180 may not be disposed on the middle case 100c side, but may be disposed on the first cover 100a side. Although not shown in the drawings, in an embodiment of the present invention, an insulating member for securing electrical insulation may be interposed between the first tab plate 110a and the circuit board 180 .

The first tab plate 110a may be directly connected to the first end 11 of the battery cell 10 that is in contact with the cooling fluid, and is in close contact with the first cover 100a through the first cover 100a. Since the cooling fluid may be in thermal contact, the circuit board 180 disposed on the first tab plate 110a may be cooled through the first tab plate 110a. Similar to the first tab plate 110a, the second tab plate 110b may be directly connected to the second end 12 of the battery cell 10 in contact with the cooling fluid, and the second cover 100b). may be in close contact with the cooling fluid through the second cover 100b.

According to the present invention, heat radiation is provided through the cooling fluid inside the case 100 to the first and second tab plates 110a and 110b in which the charging and discharging currents are concentrated so that heat can be concentrated. , it is possible to lower the temperature of the second tab plates 110a and 110b and lower the electrical resistance on the charge and discharge paths, and heat dissipation to the circuit components mounted on the circuit board 180 through the first tab plate 110a. can provide For example, one or more switch elements 185 capable of intermittently controlling the flow of charging current and/or discharging current in the charging and discharging paths may be disposed on the circuit board 180 , and the switch element 185 may be disposed on the circuit board 180 . A large amount of heat may be generated according to the on/off operation of the device. In one embodiment of the present invention, the case 100 may receive a flow of a cooling fluid together with the plurality of battery cells 10 , and the cooling fluid inside the case 100 may include the plurality of battery cells 10 . Of course, it is possible to provide heat dissipation to a heat generating component such as the switch element 185 mounted on the outside of the case 100 . As will be described later, the cooling fluid may refer to a liquid cooling medium having a relatively large heat capacity, and may provide better heat dissipation performance than a gaseous cooling medium such as air. For example, the switch element 185 may emit some heat in contact with the air at a relatively low temperature from the outside of the case 100 , but emit more heat through the cooling fluid inside the case 100 . can do. In one embodiment of the present invention, the switch element 185 may include a relay element or a solid state switch such as an FET. In one embodiment of the present invention shown in FIG. 2B , the switch element 185 may be disposed on the first tab plate 110a on the side of the first cover 100a, and the first tab plate 110a It may be thermally connected to the cooling fluid through the For example, heat dissipation of a heat generating component such as the switch element 185 may be promoted by being thermally connected to a cooling fluid through a metal plate having excellent thermal conductivity, such as the first tab plate 110a.

3A and 3B are views showing a cooling structure of a switch element according to another embodiment of the present invention.

Referring to the drawings, the case 100 can accommodate the flow of a cooling fluid for cooling the battery cell 10 , and the case 100 traverses the accommodating space A of the battery cell 10 . The partition wall 150 divides the receiving space (A) into an upstream part (A1) connected to the inlet (I) of the cooling fluid and a downstream part (A2) connected to the outlet (O) of the cooling fluid. can be formed.

The inlet (I) and outlet (O) of the cooling fluid may be formed on one end (first short side 100S1) side of the case 100 along the extending direction of the partition wall 150, and the case 100 A communication part CN connecting the upstream part A1 and the downstream part A2 may be formed at the other end (the second short side part 100S2) side of the . At this time, the cooling fluid flowing into the inside of the case 100 from the inlet (I) on the one end side is reversed in the direction of the flow near the communication part (CN) on the other end side, and then through the outlet (O) on the one end side of the case ( 100) It is possible to form a U-turn pass that flows out.

The cooling fluid flows along the extending direction of the partition wall 150 between one end (the first short side 100S1 ) where the inlet (I) and the outlet (O) are formed and the other end (the second short side 100S2) at which the communication part (CN) is formed. While flowing, in the vicinity of the communication part CN, a dense flow is formed toward the inner wall of the case 100 under the influence of centrifugal force, and the direction of the flow can be switched under the influence of the pressure acting from the inner wall of the case 100. have. At this time, one side of the case 100 facing the partition wall 150 , more specifically, the middle case 100c extending substantially in parallel with the partition wall 150 , forms contact with the cooling fluid at a high pressure and is relatively excellent. It can provide heat dissipation performance. In one embodiment of the present invention, by arranging a heating component such as the switch element 185 on one side of the case 100 facing the partition wall 150, that is, on the middle case 100c, the flow of the cooling fluid is concentrated It is possible to more effectively cool the switch element 185 through the middle case 100c, and by providing a heat dissipation path through the middle case 100c, the switch element 185 and the cooling fluid can be thermally connected to each other. . At this time, as shown in FIG. 3A , the switch element 185 may be disposed on the middle case 100c side, and the circuit board 180 may be disposed on the first cover 100a side. In addition, as shown in FIG. 3B , together with the switch element 185 , the circuit board 180 on which the switch element 185 is mounted may also be disposed on the middle case 100c side.

The middle case 100c may form a large contact area with the cooling fluid at a position farthest from the partition wall 150 and may make contact with the cooling fluid at a high pressure by the centrifugal force of the cooling fluid. For example, as shown in FIG. 2B , compared with the embodiment in which the switch element 185 is disposed on the first cover 100a side, the middle case 100c forms a large contact area with the cooling fluid while Since contact with the cooling fluid is formed at a high pressure by the centrifugal force of the cooling fluid, more efficient heat dissipation performance may be provided.

In one embodiment of the present invention, the case 100 may be formed in three divided shapes of the first and second covers 100a and 100b and the middle case 100c, and in this case, the first and second The covers 100a and 100b cover the first and second ends 11 and 12 of the battery cell 10 , and the middle case 100c may cover most of the length of the battery cell 10 . . That is, the middle case 100c can form contact with the cooling fluid over a larger area than the first and second covers 100a and 100b, and thus, it is effective for heating components such as the switch element 185. It can provide heat dissipation performance.

The switch element 185 may face the partition wall 180 and may be disposed on the long side portion 100L3 side of the middle case 100c formed along the extending direction of the partition wall 180 . The long side portion 100L3 of the middle case 100c may provide a larger heat dissipation area than the short side portions (the first and second short sides 100S1 and 100S2 of the case 100) of the middle case 100c, and the switch element 185 ) can provide a large mounting area to be advantageous for mounting. An inlet (I) and an outlet (O) of the cooling fluid may be formed on one short side (first short side 100S1 of the case 100) side of the middle case 100c, so as to avoid physical interference with these structures, the switch The device 185 may be disposed on the long side portion 100L3 side of the middle case 100c.

The long side portion 100L3 of the middle case 100c is formed between the first and second short side portions 100S1 and 100S2 of the case 100 along the extending direction of the partition wall 150 to guide the flow of the cooling fluid. It is possible to form a large contact area with the cooling fluid and at the same time form contact with the cooling fluid at a high pressure.

The middle case 100c may include a pair of long side portions 100L3 extending between the first and second short side portions 100S1 and 100S2 of the case 100 . At this time, in one embodiment of the present invention, the long side portion 100L3 of the middle case 100c on which the switch element 185 is mounted is the second long side portion 100L2 of the first and second covers 100a and 100b. ) may correspond to the long side close to the As described with reference to FIG. 2B , a plurality of first and second leads connected to the first and second tab plates 110a and 110b are provided on the first long side portion 100L1 side of the first and second covers 100a. Since 120a and 120b are intensively disposed, the switch element 180 is configured to prevent electrical interference with the first and second leads 120a and 120b. 2 It may be disposed on the long side portion close to the long side portion (100L2). At this time, the long side portion 100L3 of the middle case 100c on which the switch element 185 is mounted is an inlet I through which a relatively low temperature cooling fluid flows rather than an outlet O through which a relatively high temperature cooling fluid flows out. ) and the long side, that is, the long side closer to the upstream portion A1 connected to the inlet I rather than the downstream portion A2 connected to the outlet O.

In one embodiment of the present invention, the switch element 185 is any one of the first and second short sides 100S1 and 100S2 of the case 100 along the long side 100L3 of the middle case 100c. It may be formed at a position biased toward the portions 100S1 and 100S2. The switch element 185 may control the flow of charge/discharge current on the charge and discharge paths, and accordingly, the switch element 185 is disposed at a position close to the output terminals PE1 and PE2 (see FIG. 4 ). It may be formed at a position biased toward any one of the first and second short sides 100S1 and 100S2 of the case 100 along the long side 100L3 of the middle case 100c as possible toward the short side 100S1 and 100S2. .

For example, the switch element 185 may be formed at a position biased toward the second short side portion 100S2 adjacent to the communication portion CN among the long side portions 100L3 of the middle case 100c, in other words, , the inlet (I) and the outlet (O) may be formed at a position biased toward the second short side portion 100S2 opposite to the first short side portion 100S1 formed therein. Since the middle case 100c can form a high pressure contact with the cooling fluid by the centrifugal force of the cooling fluid near the communication portion CN, the switch element 185 is located near the communication portion CN of the middle case 100c. ) may be disposed, and the switch element 185 may be disposed at a position biased toward the second short side portion 100S2 close to the communication portion CN. In the embodiment shown in FIG. 3B , the circuit board 180 on which the switch element 185 is mounted may be disposed on the long side 100L3 of the middle case 100c together with the switch element 185 , the circuit Although the substrate 180 is disposed at a central position along the long side 100L3 direction of the middle case 100c, the switch element 185 mounted on the circuit board 180 is biased toward the second short side 100S2. may be placed in position. In another embodiment of the present invention, the circuit board 180 is a position relatively biased toward the second short side portion 100S2 rather than the first short side portion 100S1 along the long side portion 100L3 direction of the middle case 100c. can be placed in At this time, since a plurality of circuit elements including the switch element 185 may be disposed on the circuit board 180 , more efficient heat dissipation may be provided for the plurality of circuit elements according to the position design of the circuit board 180 . have. On the other hand, although not shown in the drawing, the switch element 185 is a case 100 in which an inlet I through which a relatively low temperature cooling fluid flows along the long side 100L3 of the middle case 100c is formed. It may be formed at a position biased toward the first short side portion 100S1 of the .

In the embodiment shown in FIGS. 3A and 3B , the heat dissipation such as the switch element 185 is avoided on the middle case 100c side by avoiding the first tab plate 110a where the charge and discharge currents are relatively concentrated and the heat dissipation load is concentrated. By disposing the components, the heat dissipation load of the first tab plate 110a and the switch element 185 can be distributed through different positions of the case 100, and electrical interference therebetween can be avoided.

4 is an exploded perspective view of a housing for accommodating the core pack shown in FIG. 2B according to another embodiment of the present invention.

2B and 4 together, the battery pack according to another embodiment of the present invention includes a case 100 in which a circuit board 180 is mounted and a plurality of battery cells 10 are accommodated therein. and a housing 200 accommodating the core pack CP and the core pack CP. In addition, the housing 200 may include a housing body 202 coupled to face each other with the core pack CP interposed therebetween, and a housing cover 201 .

The housing body 202 and the housing cover 201 may be formed of different materials. For example, the housing body 202 may be formed of a metal material such as aluminum, and the housing cover 201 may be formed of a resin material capable of injection molding. The housing body 202 and the housing cover 201 may be coupled in opposite directions with the core pack CP interposed therebetween, for example, the housing body 202 and the housing formed of different materials. The cover 201 may be coupled to each other through a clip structure. That is, clip grooves 201c and 202c into which the clip 250 can be fitted may be formed in each of the housing body 202 and the housing cover 201 , and the clip grooves 201c and 202c may contact each other. After aligning the housing body 202 and the housing cover 201, the housing body 202 and the housing cover 201 through the clips 250 fitted together in the clip grooves 201c and 202c arranged to be in contact with each other. can be combined with each other.

The housing body 202 provides a space accommodating all or most of the core pack CP, and the housing cover 201 covers the upper portion of the housing body 202 to seal the internal space. . The housing body 202 may be formed of a metal material such as aluminum or aluminum alloy advantageous in heat dissipation performance while providing structural rigidity of the entire battery pack, and a side surface of the housing body 202 among the circuit board 180 . On the side facing the insulated packaging electric element, for example, a switch element 185 (refer to FIG. 2b ) wrapped in an insulating resin is disposed to provide electrical insulation between the circuit board 180 and the housing body 202 . can provide In one embodiment of the present invention, the core pack CP shown in FIG. 2B may be accommodated in the housing body 202 in an upright state with the circuit board 180 facing the side of the housing body 202, and , In this case, insulation between the circuit board 180 and the housing body 202 may be provided through the switch element 185 (refer to FIG. 2B ) disposed between the side surfaces of the circuit board 180 and the housing body 202 . .

5 is an exploded perspective view of the case shown in FIG. 1 . FIG. 6 is a view showing a flow of a cooling fluid formed inside the case shown in FIG. 5 .

The case 100 may be formed in a three-part form of a middle case 100c and the first and second covers 100a and 100b, and a middle case 100c formed of different members, A sealed accommodation space (A) may be provided by the coupling of the first and second covers (100a, 100b). The middle case 100c and the first and second covers 100a and 100b may be coupled to each other by laser welding, and a first laser welding part is formed along the boundary between the middle case 100c and the first cover 100a. (L1, see FIG. 2B) may be formed, and a second laser welding part L2 (refer to FIG. 2B) may be formed along the boundary between the middle case 100c and the second cover 100b. The case 100 is formed in a three-part form of the middle case 100c and the first and second covers 100a and 100b, so that the laser welding position is close to the upper and lower portions of the battery pack. By adjusting the welding position so that it can be easily exposed to the laser beam irradiated from the upper and lower portions of the battery pack in an oblique direction, the workability of laser welding can be improved.

The middle case 100c and the first and second covers 100a and 100b may be formed through injection molding, and may be formed of an engineering plastic material capable of injection molding and laser welding. More specifically, the middle case 100c and the first and second covers 100a and 100b may be formed of a polyamide series including glass fibers. For example, as an optical condition for laser welding two base materials stacked with respect to each other, a base material that is relatively close along the laser irradiation direction needs to have an appropriate laser transmittance or more, and relatively along the laser irradiation direction. The remote base material needs to have an appropriate laser absorption rate or higher, and the middle case 100c and the first and second covers 100a and 100b are polyamide containing glass fibers to satisfy these optical properties. ) can be formed as a series.

1 and 5 , a guide rib G may be formed in the second cover 100b. The guide rib (G) is to define the assembly position of the battery cell (10), so as to surround the second end (12) of the battery cell (10) from the second cover (100b) of the battery cell (10) It may be formed to protrude toward the second end (12). Similar to the second cover 100b, a guide rib G for defining an assembly position of the battery cell 10 may be formed in the first cover 100a, and the guide rib of the first cover 100a. (G) may be formed to protrude from the first cover 100a toward the first end 11 of the battery cell 10 to surround the first end 11 of the battery cell 10 . The guide ribs G on the side of the first and second covers 100a and 100b are formed to surround different first and second ends 11 and 12 of the same battery cell 10, respectively, so that the battery cell ( 10) to regulate the assembly position, and may be formed at positions corresponding to each other.

A gap 103 ′ may be formed between the guide ribs G. For example, the gap portion 103 ′ may be provided as an extra space between the four adjacent guide ribs G so that the outer periphery is adjacent to each other. As will be described later, the gap portion 103 ′ may provide a coupling position for fixing the position of the partition wall 150 installed inside the case 100 . For example, the gap portions 103 ′ on the side of the first and second covers 100a and 100b are formed at positions corresponding to each other, so as to fix the position of the partition wall 150 installed inside the case 100 . A binding site may be provided. The technical details regarding the guide rib (G) and the gap portion (103') will be described later in more detail.

The first and second covers 100a and 100b cover the first and second ends 11 and 12 of the battery cell 10 , and the middle case 100c has a length of the battery cell 10 . Most of it can be covered. That is, along the longitudinal direction of the battery cell 10, the middle case 100c may be formed to extend longer than the first and second covers 100a and 100b. The middle case 100c may define an accommodating space A while enclosing the periphery of the battery cell 10 and may be integrally formed with the partition wall 150 formed inside the accommodating space A. . That is, the middle case 100c and the partition wall 150 may be integrally formed through injection molding.

5 and 6 , the case 100 may accommodate the flow of a cooling fluid for cooling the battery cell 10 , and an accommodation space of the battery cell 10 in the case 100 ( While extending across A), the partition wall 150 dividing the accommodation space A into an upstream portion A1 and a downstream portion A2 may be formed. The upstream part A1 is connected to the inlet I of the cooling fluid so that a relatively low temperature cooling fluid can be introduced, and the downstream part A2 is connected to the outlet O of the cooling fluid so that a relatively high temperature cooling fluid can be introduced. A cooling fluid may be evacuated. The inlet (I) and outlet (O) of the cooling fluid may be formed at one end along the extending direction of the barrier rib 150 , and the upstream portion A1 at the other end along the extending direction of the barrier rib 150 . A communication part CN connecting the and the downstream part A2 may be formed. The communication part CN reverses the flow of the upstream part A1 flowing from the inlet I at one end to the other end while connecting the upstream part A1 and the downstream part A2 and U-turns the flow of the cooling fluid to the other end side. It is possible to form a flow of the downstream portion (A2) toward the outlet (O) on the one end side.

The inlet (I) and the outlet (O) may be formed on one end side along the extending direction of the partition wall 150 , for example, are formed together on the first short side portion 100S1 side of the case 100 . can be In this way, the inlet (I) and the outlet (O) are formed together on the side of the first short side portion 100S1 of the case 100 , for example, the first, located on opposite sides of the case 100 , By not being formed on the side of the second short side portions 100S1 and 100S2, but intensively formed on the side of the first short side portion 100S1, fluid connection of the case 100 can be easily achieved. For example, the case 100 may include a pair of long sides parallel to the extending direction of the partition wall 150 and first and second short sides 100S1 and 100S2 connecting the pair of long sides to each other. The inlet (I) and the outlet (O) may be intensively formed on the side of the first short side 100S1 and are formed on the side of the second short side 100S2 opposite to the first short side 100S1. it may not be

In the present invention, the inlet (I) and the outlet (O) are formed on the side of the first short side portion 100S1 of the case 100, and the flow and the outlet of the inlet (I) through the partition wall 150 inside the case 100 By reversing the flow of the cooling fluid in a U-turn form on the second short side 100S2 side of the case 100 to connect the flow of (O), it is possible to provide a relatively large flow resistance to the flow of the cooling fluid, Accordingly, a flow of the cooling fluid may be formed such that the cooling fluid completely or mostly fills the inside of the case 100 (the inside of the accommodating space A). On the other hand, if sufficient flow resistance is not provided to the flow of the cooling fluid, for example, from the first short side 100S1 side of the case 100 to the second short side 100S2 side of the case 100 . When the flow of the cooling fluid flowing in the direction is formed, the cooling fluid flows as it is without filling a weak space such as an upper portion or a corner portion of the case 100 , so that a cooling void may be formed.

In the present invention, the accommodating space (A) of the battery cell 10 is divided into two and divided into an upstream part (A1) connected to the inlet (I) of the cooling fluid and a downstream part (A2) connected to the outlet (O) of the cooling fluid. , the cross-sectional area through which the cooling fluid flows (the cross-sectional area corresponding to the heat dissipation target) may be reduced to 1/2 of the cross-sectional area of the accommodating space A, and accordingly, the heat dissipation performance of the cooling fluid may be improved. On the other hand, when forming a flow of cooling fluid flowing in one direction from the first short side 100S1 side of the case 100 toward the second short side 100S2 side of the case 100, the cooling fluid flows Since the cross-sectional area (the cross-sectional area corresponding to the heat dissipation target) becomes the same as the cross-sectional area of the receiving space (A), in order to reduce the cross-sectional area through which the cooling fluid flows (the cross-sectional area corresponding to the heat dissipation target) to 1/2, the case 100 Separate inlets (I) and outlets (O) need to be connected to the first and second short sides 100S1 and 100S2, respectively, which complicates the connection structure of the cooling fluid, and leakage of the cooling fluid This can lead to problems that increase your chances.

In various embodiments of the present invention, the inlet (I) and the outlet (O) may be formed dispersedly in the first and second short sides 100S1 and 100S2 of the case, and are not formed in the same number but different numbers. may be formed, and each may be formed in two or more plurality. For example, two or more partition walls 150 may be provided in plurality, and two or more inlets (I) or outlets (O) are provided so that an inlet (I) or an outlet (O) is provided for each divided area. It may be formed, and in this case, the inlet (I) and the outlet (O) may be provided in different numbers rather than the same number. However, in the embodiment shown in FIG. 5 , the inlet (I) and the outlet (O) are formed together on the first short side portion 100S1 side of the case 100, and may be formed in singular number one by one to form a pair. , in this embodiment, the fluid connection of the case 100 can be easily made, and the cooling gap that can be generated in a vulnerable space such as the upper or corner part of the case 100 is eliminated through an appropriate flow resistance. As described above, the heat dissipation performance of the cooling fluid may be improved by reducing the cross-sectional area through which the cooling fluid flows (the cross-sectional area corresponding to the heat dissipation target).

Referring to FIG. 6 , the guide ribs G or the battery cells 10 may be arranged in rows along the extending direction of the barrier ribs 150 . In this case, the barrier ribs 150 include the guide ribs G, Alternatively, the plurality of rows formed by the battery cell 10 may be extended across the first and second rows R1 and R2 adjacent to each other to divide the plurality of rows into two rows with the same number of rows.

In one embodiment of the present invention, the guide ribs G or the battery cell 10 may be arranged in eight rows along the extending direction of the partition wall 150 , and in this case, the partition wall 150 includes eight rows. can be divided into two to form an upstream portion A1 and a downstream portion A2 in four rows, respectively. In this way, by adjusting the number of battery cells 10 belonging to the upstream part A1 and the downstream part A2 to an approximately equal level, the heat dissipation burden of the cooling fluid is equally distributed between the upstream part A1 and the downstream part A2. can make it happen

Assuming that the partition wall 150 extends across the first and second rows R1 and R2 adjacent to each other, the guide rib G or the battery cell 10 of the first row R1 is the second The first and second rows R1 and R2 may be arranged adjacent to each other so as to be sandwiched between the guide ribs G or the battery cells 10 of the row R2, and in this case, the partition wall 150 is It may extend across the first and second rows R1 and R2 in the form of a meander. For example, the partition wall 150 includes a plurality of bent portions while extending in a zigzag pattern along the outer surface of the guide ribs G or the battery cell 10 of the first and second rows R1 and R2. can do.

Referring to FIG. 5 , the partition wall 150 includes a body portion 155 extending across the accommodation space A, and first and second ends going from one end to the other along the extending direction of the main body portion 155 . It may include first and second coupling portions 151 and 152 protruding at intermittent positions toward the covers 100a and 100b. The first and second coupling portions 151 and 152 may be respectively coupled to the clearance portions 103 ′ of the first and second covers 100a and 100b.

The second coupling portion 152 may protrude from the body portion 155 of the partition wall 150 so as to abut against the clearance portion 103 ′ of the second cover 100b, and the second coupling portion 152 abuts against each other. ) and the gap portion 103 ′ of the second cover 100b may be coupled to each other through laser welding, and the gap portion 103 ′ of the second cover 100b has a welding portion with the second coupling portion 152 . can be formed. Similarly, the first coupling portion 151 may protrude from the body portion 155 of the partition wall 150 so as to come into contact with the clearance portion 103 ′ of the first cover 100a, and the first coupling portion abuts against each other. The portion 151 and the gap portion 103 ′ of the first cover 100a may be coupled to each other through laser welding, and the gap portion 103 ′ of the first cover 100a has a first coupling portion 151 . ) and a weld can be formed. The first and second coupling portions 151 and 152 are formed at positions corresponding to each other along the extending direction of the partition wall 150, and the gap portions ( 103'), respectively.

The partition wall 150 may be integrally formed with the middle case 100c, for example, may be formed together with the middle case 100c by injection molding. In this case, the first and second coupling portions 151 and 152 may protrude from the middle case 100c and be coupled to the clearance portions 103 ′ of the first and second covers 100a and 100b, respectively.

The body part 155 of the partition wall 150 may be formed to have different first and second heights h1 and h2 along the extending direction of the partition wall 150 . The body portion 155 of the partition wall 150 may be formed to have a first height h1 over most of the length from one end side (the first short side portion 100S1 side) where the inlet (I) and the outlet (O) are formed. and an upstream portion A1 and a downstream portion A2 may be partitioned between the first and second covers 100a and 100b. The main body part 155 of the partition wall 150 has an upstream part A1 and a downstream part A2 on the other end side (second short side part 100S2 side) opposite to the one end side where the inlet I and the outlet O are formed. ) at the other end side (second short side 100S2 side) to form a communication part CN connecting the ), and a communication portion CN corresponding to a height difference between the first height h1 and the second height h2 may be formed. That is, the body portion 155 of the partition wall 150 may be formed to be stepped from a first height h1 at one end to a second height h2 at the other end, and the first and second heights h1. , h2) may form a communication part CN corresponding to the height difference between them.

When the relative ratio of the second height h2 to the first height h1 increases, the height difference between the first and second heights h1 and h2 decreases and the size of the communication part CN decreases. While the flow resistance of the cooling fluid increases and the flow rate decreases, the mechanical rigidity of the partition wall 150 increases. Conversely, when the relative ratio of the second height h2 to the first height h1 decreases, the height difference between the first and second heights h1 and h2 increases and the size of the communication part CN increases. increases, the flow resistance of the cooling fluid decreases and the flow velocity increases, but the rigidity of the partition wall 150 decreases. In the present invention, the second height relative to the first height h1 of the partition wall 150 is provided so that the shape of the partition wall 150 is firmly maintained and sufficient rigidity is provided while considering the driving power according to the flow resistance of the cooling fluid. The relative ratio of (h2) can be appropriately designed.

The portion formed with the second height h2 may be formed at a central position of the portion formed with the first height h1, and accordingly, the portion formed with the second height h2 and the first height h1 may be formed at the second height h2. An upper step and a lower step may be formed between the portions formed by . In this case, the communication part CN includes a first communication part CN1 corresponding to an upper step close to the first cover 100a and a second communication corresponding to a lower step close to the second cover 100b side. It may include a part CN2, and is formed between the upstream part A1 and the downstream part A2 through the first and second communication parts CN1 and CN2 formed at opposite positions along the height direction of the partition wall 150 . The flow of the cooling fluid can be smoothly continued. For example, the first communication part CN1 may form a flow of a cooling fluid in contact with the first end 11 side of the battery cell 10 , and the second communication part CN2 may include a battery A flow of cooling fluid may be formed in contact with the second end 12 side of the cell 10 . A flow of the cooling fluid may be formed on the side of the first and second ends 11 and 12 where heat is relatively concentrated through the first and second communication parts CN1 and CN2.

In one embodiment of the present invention, the communication part CN may be provided as an opening corresponding to a step difference between the first and second heights h1 and h2 formed in the body part 155 of the partition wall 150 . In another embodiment of the present invention, the communication portion CN may be provided as a hole-shaped opening formed in the body portion 155 of the partition wall 150, and upstream through the hole-shaped communication portion CN. As the flow of the cooling fluid in the part A1 and the downstream part A2 is connected to each other, a flow of the cooling fluid in a U-turn shape may be formed.

In one embodiment of the present invention, the communication part CN may be formed in the body part 155 of the partition wall 150 . The body part 155 of the partition wall 150 serves to guide the flow of the cooling fluid while extending across the receiving space A, and in this sense, a communication part for inducing the reverse flow of the cooling fluid ( CN) may be formed in the body portion 155 of the partition wall 150 . In another embodiment of the present invention, the partition wall 150 may not include the first and second coupling portions 151 and 152 coupled to the first and second covers 100a and 100b, and the In the partition wall 150 , the first and second coupling parts 151 and 152 and the main body part 155 are not separated, so the communication part CN can be said to be formed in the partition wall 150 itself.

7A and 7B are an exploded perspective view and a plan view of the first cover shown in FIG. 1 .

1 , 7A and 7B , the case 100 can airtightly accommodate a cooling fluid for cooling the battery cell 10 , from the inside of the accommodating space A filled with the cooling fluid. A sealing for the accommodation space (A) may be provided to block leakage of the cooling fluid.

First and second terminal holes 101 ′ for exposing the first and second ends 11 and 12 of the battery cell 10 in the first and second covers 100a and 100b of the case 100 , 102 ′) may be formed, and the battery cell 10 is exposed through the first and second ends 11 and 12 of the battery cell 10 exposed from the first and second terminal holes 101 ′ and 102 ′. electrical connection can be made.

The first and second terminal holes 101 ′ and 102 ′ are connected to the first and second ends 11 and 12 of the battery cell 10 through the first and second terminal holes 101 ′ and 102 ′. Only the central part of the first and second ends 11 and 12 of the battery cell 10 may be exposed so that the battery cell 10 does not completely come out, and the edge part of the first and second ends 11 and 12 of the first and second terminals may be exposed to the first and second terminals. It may be covered by the first and second covers 100a and 100b around the holes 101' and 102'.

Referring to FIGS. 1 and 7B together, guide ribs G may be formed on the first and second covers 100a and 100b. The guide rib G surrounds the outer periphery of the first and second ends 11 and 12 of the battery cell 10 , and the first and second terminal holes 101 ′ and 102 ′ of the battery cell 10 . ) may be formed at an outer position rather than the blocking rib (B) surrounding the first and second terminal holes 101' and 102', and the blocking rib (B) at the inner position and the guide rib at the outer position (G) may be formed in the form of concentric circles extending in parallel from the first and second covers 100a and 100b toward the first and second ends 11 and 12 of the battery cell 10 . The guide rib (G) may serve to fix the sealing member (S) in a fixed position on the outside of the sealing member (S, see FIG. 7b) while regulating the assembly position of the battery cell 10, and It is possible to prevent the flow or shaking of the member (S). Technical matters regarding the blocking rib (B) and the sealing member (S) will be described later in more detail.

The guide ribs G may be formed in an annular shape to surround the outer edges of the first and second ends 11 and 12 of the battery cell 10, and the guide ribs G are arranged in a row, The guide ribs G of adjacent rows may be disposed adjacent to each other so as to fit into each other's trough regions. Since the guide rib (G) is formed at a position corresponding to the battery cell (10), the arrangement of the guide rib (G) as the battery cells (10) in adjacent rows are arranged adjacent to each other to fit into each other's trough area It may also be formed in a pattern corresponding to the arrangement of the battery cells 10 .

A clearance portion 103 ′ may be formed between the guide ribs G, and more specifically, the clearance portions 103 ′ are adjacent guides to face each other with the valley region of the guide rib G interposed therebetween. It may be formed between the ribs (G). For example, the gap portion 103 ′ may be provided as an extra space between the four adjacent guide ribs G so that the outer periphery is adjacent to each other.

The gap portion 103 ′ can absorb the tolerance of the neighboring guide ribs G, and can provide a coupling position for fixing the position of the partition wall 150 (refer to FIG. 5 ) installed inside the case 100 . have. The gap portion 103 ′ is formed to be thinner than the thickness of the guide ribs G protruding from the first and second covers 100a and 100b, thereby providing a coupling position of the partition wall 150 (refer to FIG. 5 ). In addition, it is possible to prevent the gap between the adjacent guide ribs (G) from being distorted according to the volume contraction of the gap portion 103 ′ while the hot molten resin is cooled to room temperature during injection molding.

7A and 7B , a sealing member S may be disposed on the first cover 100a. More specifically, a sealing member S for blocking a leakage path of the cooling fluid through the first terminal hole 101 ′ may be disposed outside the first terminal hole 101 ′. Although not shown in the drawing, another sealing member (S) for blocking the leakage path of the cooling fluid through the second terminal hole 102' also on the outside of the second terminal hole 102' on the second cover 100b side. ) can be placed. Hereinafter, the sealing member (S) disposed on the side of the first terminal hole (101') is mainly described, but substantially the same technology is also about another sealing member (S) disposed on the side of the second terminal hole (102'). Features can be applied.

The sealing member S may be formed in an annular shape to continuously surround the first terminal hole 101 ′. In an embodiment of the present invention, the sealing member S (more specifically, the first sealing member S1) may be formed separately from each other and arranged in plurality to surround each of the first terminal holes 101 ′, , Each of the sealing members (S, more specifically, the first sealing member S1) may be positioned on the inside of the guide rib (G) surrounding the first end (11) of the battery cell (10). In another embodiment of the present invention, the plurality of sealing members S and the first sealing member S1 may be connected to each other to form one sheet, and in this case, the plurality of first terminal holes 101 by one-time alignment `), each of the sealing members (S, the first sealing member S1) can be aligned at the same time.

FIG. 8 is a perspective view taken along line VIII-VIII of FIG. 1 .

Referring to the drawings, the sealing member (S) includes first and second sealing members (S1, S2) doubly surrounding the first terminal hole (101') from the outside of the first terminal hole (101') can do. The first terminal hole 101 ′ may be double-enclosed and sealed by first and second sealing members S1 and S2, and the first and second sealing members S1 and S2 may include a first A gap between the first cover 100a and the first end 11 of the battery cell 10 may be double blocked from the outside of the terminal hole 101 ′.

The first and second sealing members S1 and S2 may be formed in an annular shape to continuously surround the first terminal hole 101 ′. More specifically, the first sealing member S1 may be formed in an annular shape to surround the first terminal hole 101 ′ at a relatively outer position, and the second sealing member S2 may be located at a relatively inner position. may be formed in an annular shape to surround the first terminal hole 101 ′.

The first sealing member S1 may be formed in a standardized shape and may be formed by insert injection together with the first cover 100a. For example, the first sealing member S1 may be formed of an elastic material having excellent sealing characteristics, for example, may be formed of a rubber material such as EPDM.

The first sealing member S1 may include a protrusion S11 protruding from the first cover 100a. The first sealing member (S1) is for blocking a gap between the first cover (100a) and the first end (11) of the battery cell (10), the protrusion (S11) of the first sealing member (S1) It may protrude from the first cover 100a and contact the first end 11 of the battery cell 10 . For example, the protrusion S11 surrounds the first terminal hole 101 ′ and may block the leakage path of the cooling fluid through the first terminal hole 101 ′, for this purpose, the first cover 100a It may protrude from and be in elastically pressed contact with the first end 11 of the battery cell 10 .

As such, a portion of the first sealing member S1 may protrude from the first cover 100a to form a protrusion S11 in contact with the first end 11 of the battery cell 10 , and the first sealing Another part of the member S1 may be fitted into the coupling groove S′ formed in the first cover 100a to form a buried portion S12 for fixing the position of the first sealing member S1. The protrusion S11 and the buried portion S12 may be attached to each other to form one side and the other side of the first sealing member S1.

The coupling groove S` of the buried portion S12 and the first cover 100a may be formed in a complementary shape to match each other, and may be formed in a dove-tail shape so as not to be separated from each other. can be achieved More specifically, the buried portion S12 may have a width that is gradually increased along the retracting direction of the coupling groove S′, and the buried portion S12 that is increased along the retracting direction of the coupling groove S′. ), the width may act as a locking sill that blocks the separation of the buried part S12 from the coupling groove S`.

The embedding part S12 may be formed in a shape fitted into the coupling groove S` of the first cover 100a by insert injection. For example, the first sealing member S1 including the dove-tail shaped embedding portion S12 is temporarily fixed in a mold (not shown) into which the molten resin of the first cover 100a is injected. Then, by injecting the molten resin, the first cover 100a having a coupling groove S` matched with the dovetail-shaped buried portion S12 may be formed. In addition, the buried portion S12 may be formed to be embedded in the coupling groove S′ of the first cover 100a.

The first and second sealing members S1 and S2 may be formed to surround the first terminal hole 101 ′ at different positions outside the first terminal hole 101 ′. That is, the first sealing member S1 may be disposed outside the first terminal hole 101 ′, and the second sealing member S2 may be disposed in a radial direction of the first terminal hole 101 ′. may be formed between the first terminal hole 101 ′ and the first sealing member S1 along the

For reference, throughout this specification, the radial direction of the first terminal hole 101 ′ does not limit that the first terminal hole 101 ′ is formed in a circular shape. It may be formed in any other shape including an ellipse, and in this case, the radial direction of the first terminal hole 101 ′ refers to a radially spreading direction from the central position of the first terminal hole 101 ′ to the periphery. can mean

The second sealing member S2 may be filled between the first terminal hole 101 ′ and the first sealing member S1 , and may be formed of a material having a difference in fluidity according to heating. For example, the second sealing member S2 may exist in a liquid phase or a liquid-like gel state at a high temperature, and a filling space F between the first terminal hole 101 ′ and the first sealing member S1 . It may have sufficient fluidity to permeate into the filling space F to fill the filling space F, and may be solidified while cooling to room temperature. The material of the second sealing member S2 may be formed of a material that may have a difference in fluidity depending on heat or pressure or may have a difference in fluidity by irradiating light in a specific wavelength band, such as ultraviolet rays, when heated. , pressure, light irradiation, etc. may be formed of a material that can have a difference in fluidity according to various fluidity control factors.

A blocking rib B may be formed on the outside of the first terminal hole 101 ′ to prevent the fluid second sealing member S2 from permeating into the first terminal hole 101 ′. For example, the blocking rib (B) is formed to protrude from the first cover (100a) toward the first end (11) of the battery cell (10), so that the second sealing member (S2) having fluidity is first formed. 1 Filling space (F) of the second sealing member (S2) so as not to penetrate into the inside of the first terminal hole (101') through the gap between the first cover (100a) and the first end (11) of the battery cell (10) can be defined. The blocking rib B may be formed outside the first terminal hole 101 ′. For example, the blocking rib B surrounds the first terminal hole 101 ′ and the first terminal hole. (101') can be defined.

The blocking rib (B) defines the filling space (F) of the second sealing member (S2) on the outside of the first terminal hole (101'), while the first and second sealing members (S1, S2) In addition, it is possible to block the leakage path of the cooling fluid through the first terminal hole 101 ′ together, and by providing another seal surrounding the first terminal hole 101 ′, the first terminal hole 101 as a whole It can be said that a triple sealing structure is provided around `).

The filling space F of the second sealing member S2 may be defined between the blocking rib B and the first sealing member S1 along the radial direction of the first terminal hole 101 ′, and the first It may be defined between the first cover 100a and the first end 11 of the battery cell 10 along the penetration direction of the terminal hole 101 ′. For example, the filling space F of the second sealing member S2 may be formed in a donut shape along the outer periphery of the first terminal hole 101 ′.

An injection hole H connected to the filling space F may be formed in the first cover 100a. For example, the injection hole H may be formed at a position between the blocking rib B where the filling space F is formed and the first sealing member S1 . The second sealing member S2 injected into the filling space F through the injection hole H fills the filling space F, and the remaining second sealing member S2 fills the inside of the injection hole H. can For example, the second sealing member S2 pressurized by a predetermined pressure may be injected into the filling space F through the injection hole H, and injected to substantially fill the entire volume of the filling space F. can be

The first and second sealing members S1 and S2 may provide a double sealing structure at positions adjacent to each other along the radial direction of the first terminal hole 101 ′. However, the technical scope of the present invention is not limited thereto, and the sealing structure of the present invention may include a plurality of sealing structures disposed adjacent to each other with discontinuous boundaries along the radial direction of the first terminal hole 101 ′. In addition, by providing a double or more multiple sealing structure, leakage of the cooling fluid through the first terminal hole 101 ′ can be blocked with high reliability.

In the embodiment of Fig. 8, the second sealing member (S2), unlike the first sealing member (S1), is formed in a liquid or close to liquid form in a fluidized form, and then the injection hole (H) formed in the first cover (100a) ) can be formed in such a way that it is injected through. However, the technical scope of the present invention is not limited thereto, and for example, the second sealing member S2 is formed in a standardized form in addition to the filling method through the injection hole H, and is formed with the first cover 100a and It may be assembled to the first cover 100a by inserting the second sealing member S2 formed together by injection molding or formed separately from the first cover 100a to the first cover 100a.

The first and second sealing members S1 and S2 may be disposed on the outside of the first terminal hole 101 ′, and although not shown in the drawings, also outside the second terminal hole 102 ′, another The first and second sealing members S1 and S2 may be double disposed. The first and second sealing members S1 and S2 on the side of the second terminal hole 102 ′ are the second cover 100b and the second sealing member S1 of the battery cell 10 from the outside of the second terminal hole 102 ′. The gap between the two ends 12 can be double blocked. That is, the first sealing member S1 may be formed in an annular shape along the outside of the second terminal hole 102 ′, and the second sealing member S2 surrounds the second terminal hole 102 ′. may be formed to fill the filling space F defined by the blocking rib (B) and the first sealing member (S1) outside the blocking rib (B). Since the technical details regarding the first and second sealing members S1 and S2 are substantially the same as those already described, a repetitive description will be omitted.

9A and 9B are cross-sectional views showing a modified embodiment of the first sealing member shown in FIG. 8 .

Referring to the drawings, the first sealing members S1a and S1b include buried portions S12a and S12b embedded in the first cover 100a, and the first cover 100a extending from the embedding portions S12a and S12b. It may include protrusions S11a and S11b protruding from the . The buried portions S12a and S12b may be formed in a complementary shape to match the coupling groove S` of the first cover 100a, and at least a portion of the buried portions S12a and S12b may be formed in the coupling groove S`. ) may have a wider width than the stopping jaw (SP) so that departure is prevented by the stopping jaw (SP).

More specifically, the embedding portions S12a and S12b are narrow portions NPa and NPb that form the bottleneck of the first sealing members S1a and S1b to correspond to the engaging projection SP of the coupling groove S`. and wide portions WPa and WPb having a wider width than the narrow portions NPa and NPb. At this time, the wide portions (WPa, WPb), as shown in Figs. 9a and 9b, limit having a wider width than the engaging projection (SP) so as not to come out from the engaging projection (SP) of the coupling groove (S') In, it may be formed in various shapes, and may have a trapezoidal cross-section or a rectangular cross-section. The protrusions S11a and S11b may protrude from the first cover 100a and come into contact with the first end 11 of the battery cell 10 , and may be wide with the first end 11 of the battery cell 10 . It may be formed to have a wider width than the narrow portions NPa and NPb of the buried portions S12a and S12b to form a contact surface.

The first sealing members S1a and S1b shown in FIGS. 9A and 9B, similar to the first sealing member S1 shown in FIG. 8, may be formed by injection molding together with the first cover 100a. , alternatively, the first sealing members S1a and S1b formed separately from the first cover 100a may be assembled in such a way that they are inserted into the coupling grooves S` of the first cover 100a.

The case 100 may receive a cooling fluid for cooling the battery cell 10 together with the battery cell 10 . Here, the cooling fluid refers to a liquid cooling medium having a relatively large heat capacity, and may provide better heat dissipation performance than a gaseous cooling medium such as air. The cooling fluid may flow through the accommodating space (A, see FIG. 1 ) of the case 100 , and may perform heat dissipation through the surface of the battery cell 10 while in direct contact with the battery cell 10 . For example, the accommodating space A of the case 100 (refer to FIG. 1 ) may accommodate the flow of the cooling fluid in direct contact with the battery cell 10 , and the receiving space A of the case 100 , 1), convective heat transfer for directly transporting the heat of the battery cell 10 through the flow of the cooling fluid may be performed.

In one embodiment of the present invention, the battery cell 10 may be provided as a large-sized battery with high output and high capacity to provide high electrical output. It may be accompanied by a relatively large amount of heat. Accordingly, in the present invention, for heat dissipation of the battery cell 10 , a flow of a cooling fluid in direct contact with the battery cell 10 is formed, and has a relatively large heat capacity rather than a gaseous cooling medium such as air. By applying the cooling fluid, it is possible to smoothly dissipate the operating heat from the battery cell 10 .

In one embodiment of the present invention, the battery cell 10 may be formed as a cylindrical battery having a diameter of 21 mm or more and a length of 700 mm or more. For example, heat dissipation by direct contact with a cooling fluid can provide a smooth heat dissipation effect even for a cylindrical battery with a diameter of 30 mm or more and a length of 1000 mm or more, and to improve the output of individual battery cells 10 accompanied by an increase in dimensions. Accordingly, a high-output, high-capacity battery pack may be provided. However, the technical scope of the present invention is not limited to a battery of a relatively large size, and in consideration of the electrical output characteristics required depending on the application site, for example, it is applied to a place where instantaneous high output is required, or Like a battery having a relatively large resistance, it may be disposed in an application area that may be accompanied by high heat generation according to individual circumstances, or may be applied to a battery that may be accompanied by high heat generation in characteristics.

Since the cooling fluid may include an electrically insulating fluid or an electrically conductive fluid, an insulating coating T may be provided on the outside of the battery cell 10 in direct contact with the cooling fluid, as shown in FIG. 8 . For example, the surface of the battery cell 10 may have the same polarity as any one of the first and second ends 11 and 12 of the battery cell 10 , and may be directly connected to the plurality of battery cells 10 . An insulating coating T may be formed on the surface of the battery cell 10 to prevent electrical interference between different battery cells 10 from occurring along the flow of the cooling fluid participating in heat transport while making contact.

Referring to FIG. 8 , the insulating coating T of the battery cell 10 may be formed to expose a central portion of the first end 11 to which the battery cell 10 is electrically connected. More specifically, the insulating coating (T), the central portion of the first end (11) of the electrical connection of the battery cell (10) is made, and the second end (12) of another electrical connection of the battery cell (10). ) may be formed to cover the entirety of the battery cell 10 except for the central portion. That is, the insulating coating T may be terminated on the first and second ends 11 and 12 of the battery cell 10 while entirely surrounding the side surface of the battery cell 10 . In this way, the terminating position P1 of the insulating coating T may be formed on the first and second ends 11 and 12, and a first deviated position P1 of the insulating coating T may be provided. , the central portions of the second ends 11 and 12 may be exposed from the insulating coating T to form an electrical connection of the battery cells 10 .

Hereinafter, among the first and second ends 11 and 12 of the battery cell 10 , the terminal position P1 of the insulating coating T formed on the first end 11 is mainly described. The described technical features can be equally applied to the terminal position P1 of the insulating coating T formed on the second end 12 of the battery cell 10 .

Referring to FIG. 8 , the terminal position P1 of the insulating coating T is, along the radial direction of the first terminal hole 101 ′, the first terminal hole 101 ′ and the second sealing member S2 . can be formed in between. That is, the insulating coating T may be formed up to the first terminal hole 101 ′ at the longest, and may be formed up to the second sealing member S2 at the shortest length.

If the insulating coating T extends to the inside of the first terminal hole 101 ′ and covers the central portion of the first end 11 of the battery cell 10 , the electrical connection of the battery cell 10 may be disturbed. and, if the insulating coating T is not formed to the point where the blocking of the cooling fluid is double secured by the first and second sealing members S1 and S2, the leakage between the cooling fluid and the battery cell 10 is Direct contact may be made and electrical interference may be caused.

The end position P1 of the insulating coating T may be formed between the first terminal hole 101 ′ and the second sealing member S2. In one embodiment of the present invention, the insulating coating T ) may be formed within the thickness w of the blocking rib B corresponding to between the first terminal hole 101 ′ and the second sealing member S2 . More specifically, since the inside of the blocking rib B surrounds the first terminal hole 101 ′, and the outside of the blocking rib B comes in contact with the second sealing member S2 , the blocking rib B ) in the thickness w between the inner and outer sides of the insulating coating (T) may be formed at the end position (P1).

FIG. 10 is a diagram showing an arrangement of the battery cells shown in FIG. 1 .

Referring to the drawing, the battery cell 10 may include first and second battery cells 10a and 10b disposed at levels offset from each other along the length direction of the battery cell 10 . In this case, the first ends 11 of the first and second battery cells 10a and 10b are adjacent to each other, and the first and second battery cells 10a and 10b are adjacent to each other at opposite sides of the first end 11 . The second ends 12 of each other may form a step (d1, d2) with each other. Here, the first end 11 means one end of the battery cell 10 facing the first cover 100a, and the second end 12 is the battery cell facing the second cover 100b. It may mean the other end of (10).

By disposing the first and second battery cells 10a and 10b having the same longitudinal length at levels offset from each other in the longitudinal direction, the step d1 between the first ends 11 adjacent to each other and the second battery cells adjacent to each other The step d2 between the two ends 12 may be formed to have the same size, and the step direction may be opposite to each other, so that the first relatively protruding first among the first and second battery cells 10a and 10b. The first battery cell 10a having an end portion 11 may have a relatively retracted second end 12 , and conversely, the first battery cell 10a having a relatively retracted second end 12 among the first and second battery cells 10a and 10b. The second battery cell 10b having a first end 11 may have a relatively protruding second end 12 . That is, when the first end 11 of the first battery cell 10a protrudes outward from the first end 11 of the second battery cell 10b, the second end of the first battery cell 10a protrudes as much as the first end 11 of the second battery cell 10b. The second end 12 may be inserted into the second end 12 of the second battery cell 10b.

For example, the step d1 between the first ends 11 adjacent to each other and the step d2 between the adjacent second ends 12 between the first and second battery cells 10a and 10b are 3 mm to It may be formed in a range of 12 mm, preferably, may be formed in a range of 4 mm to 10 mm. As will be described later, the step d1 between the first ends 11 adjacent to each other and the second ends 12 adjacent to each other are sufficient to secure exhaust paths of the first and second battery cells 10a and 10b. The step difference d2 may be 3 mm or more, preferably, 4 mm or more. At this time, the step d1 between the first ends 11 adjacent to each other and the step d2 between the adjacent second ends 12 are 12 mm so that the energy density of the battery pack is not reduced due to the excessive steps d1 and d2. Below, preferably, it may be formed to be 10 mm or less.

The first and second battery cells 10a and 10b may be formed of substantially the same battery cell 10, and are arranged so that the polarities of the first and second ends 11 and 12 are reversed from each other. The first ends 11 of the first and second battery cells 10a and 10b and the second ends 12 of the first and second battery cells 10a and 10b may have electrically opposite polarities. . In this case, the first and second battery cells 10a and 10b are arranged so that the polarities of the first and second ends 11 and 12 are reversed and are arranged at a level offset from each other at the same time, 2 The first ends 11 of the battery cells 10a and 10b may have electrically opposite polarities and spatially form a step d1 with each other, and similarly, from the opposite side of the first end 11 The second ends 12 of the first and second battery cells 10a and 10b adjacent to each other may have electrically opposite polarities, and spatially form a step d2 with each other.

1 and 10 together, the first cover 100a may be disposed on the first end 11 of the first and second battery cells 10a and 10b to cover the first end 11, and , a second cover 100b may be disposed on the second end 12 of the first and second battery cells 10a and 10b to cover the second end 12 . At this time, the first cover 100a is extended along the step d1 between the first ends 11 of the first and second battery cells 10a and 10b, and the step is outside the first cover 100a. A space ST may be formed, and similarly, the second cover 100b extends along the step d2 between the second ends 12 of the first and second battery cells 10a and 10b. While being done, another stepped space ST may be formed outside of the second cover 100b.

Hereinafter, the stepped space ST formed on the side of the first cover 100a is mainly described, but the technical features described below are equally applicable to the stepped space ST formed on the side of the second cover 100b. can

Referring to FIGS. 1 and 10 , the first cover 100a has a protrusion P covering the first end 11 of the first and second battery cells 10a and 10b at different levels, respectively, and the inlet It may include a portion R, and may include a step portion PR extending along the step d1 between the first ends 11 of the first and second battery cells 10a and 10b. . In addition, a step space ST corresponding to the step d1 between the first ends 11 of the first and second battery cells 10a and 10b may be formed outside the inlet portion R.

In one embodiment of the present invention, the protrusion P may be formed at a relatively protruding high level to cover the first end 11 of the relatively convexly protruding first battery cell 10a, The lead-in portion R may be formed at a relatively low level that is introduced so as to cover the first end 11 of the second battery cell 10b that is relatively concavely introduced. And, the step portion PR extends along the step d1 between the first ends 11 of the first and second battery cells 10a and 10b, and the protrusion P and the inlet portion R ) can be connected to each other. In this case, the step space ST may be formed outside the inlet portion R formed at a relatively low level.

In one embodiment of the present invention shown in FIG. 1 , the first and second battery cells 10a and 10b may be arranged in a column, respectively, and the column of the first battery cell 10a and the second battery cell ( The columns of 10b) may be arranged side by side at positions adjacent to each other. In one embodiment of the present invention, the first and second battery cells 10a and 10b may be provided as a cylindrical battery, and the first battery cell 10a is a valley of a second battery cell 10b adjacent to each other. and the second battery cell 10b is disposed in the valley region of the first battery cell 10a adjacent to each other, thereby reducing dead space and providing a battery pack having a high energy density.

The protrusion P of the first cover 100a may be formed along a row of first battery cells 10a having a relatively protruding first end 11 , and A first terminal hole 101 ′ for electrical connection may be included. The lead-in portion R of the first cover 100a may be formed along a row of the second battery cells 10b having the first end 11 relatively retracted, and A first terminal hole 101 ′ for electrical connection may be included. Since the step space ST is formed outside the inlet portion R, the step space ST is a channel N that crosses the first cover 100a along the row of the second battery cells 10b. 1) can be formed in the form.

The step space ST of the first cover 100a may provide a discharge path for discharging the exhaust gas from the battery cell 10 . For example, the stepped space ST of the first cover 100a is formed outside the inlet R, and the inlet R is formed through the first terminal hole 101 ′ formed in the inlet R. ) is connected to the first end 11 of the second battery cell 10b that is relatively concavely introduced from the inside, and the exhaust path of the exhaust gas discharged from the first end 11 of the second battery cell 10b can provide

11 is a perspective view illustrating a stepped space of the battery pack shown in FIG. 1 . FIG. 12 is a perspective view cut along the line XII-XII of FIG. 11 , and is a view for explaining gas discharge of a battery cell using a stepped space.

Referring to FIG. 11 , a first tab plate 110a electrically connected to the first ends 11 of the first and second battery cells 10a and 10b may be disposed on the first cover 100a. Referring to FIG. 12 , the first tab plate 110a is disposed at the first end of the second battery cell 10b through the step space ST on the first cover 100a and the first terminal hole 101 ′. (11) can be connected. In this case, an exhaust hole E may be formed along the outer edge of a central portion coupled to the first tab plate 110a among the first ends 11 of the second battery cell 10b. For example, the exhaust holes E are arranged in plurality to surround the central portion of the first end 11 , so that the exhaust gas accumulated in the second battery cell 10b can be quickly discharged to the outside. have. In one embodiment of the present invention, the exhaust holes (E) may be arranged in a circular shape to surround the central portion of the first end (11), a plurality of exhaust holes (E) is a central portion of the first end (11) By being disposed at approximately the same radial position as the center, as will be described later, they may be exposed together through the circular first terminal hole 101 ′. In one embodiment of the present invention, the exhaust hole (E) may include three exhaust holes (E) arranged to surround the central portion of the first end (11). In one embodiment of the present invention, each exhaust hole (E) may extend in an arc shape surrounding the central portion of the first end (11). Meanwhile, in another embodiment of the present invention, the exhaust hole E may be formed in a single number, and may extend to a sufficient length along an arc shape surrounding the central portion of the first end 11 .

The exhaust hole E and the central portion of the first end 11 may be exposed together through the first terminal hole 101 ′, and the first terminal hole 101 ′ includes the exhaust hole E and the first end portion 11 . It may be sized (eg, diameter) sufficient to expose the central portions of the ends 11 together.

The exhaust hole E may be connected to the stepped space ST outside the first cover 100a via the first terminal hole 101 ′. More specifically, the exhaust gas discharged through the first terminal hole 101 ′ is a stepped space ST between the first cover 100a (more specifically, the inlet portion R) and the first tab plate 110a. In that the stepped space ST provides an exhaust path connected to the first terminal hole 101 ′, the stepped space ST may be more than the first cover 100a. Specifically, it may be said that it is formed between the inlet portion R and the first tab plate 110a. Meanwhile, the first end 11 of the second battery cell 10b may correspond to the anode side where the exhaust hole E is formed.

Referring to FIG. 10 , similarly to the first cover 100a , the second cover 100b includes the second end 12 of the first battery cell 10a and the second cover 100b of the second battery cell 10b. It may extend along the step d2 between the second ends 12 of the first and second battery cells 10a and 10b while covering the second ends 12 , and accordingly, the second cover 100b A step space ST corresponding to the step d2 between the second ends 12 may be formed outside of the . In this case, the step space ST may be formed on the second end 12 of the first battery cell 10a that is relatively concavely introduced.

The step space ST of the second cover 100b may provide an exhaust path for discharging the exhaust gas of the battery cell 10 . For example, the step space ST of the second cover 100b is relatively concave inside the second cover 100b through the second terminal hole 102 ′ formed in the second cover 100b. It is connected to the second end 12 of the introduced first battery cell 10a, and may provide a discharge path for the exhaust gas discharged from the second end 12 of the first battery cell 10a. At this time, another exhaust hole E for discharging exhaust gas accumulated therein may be formed in the second end 12 of the first battery cell 10a, and The second end 12 may correspond to the anode side where the exhaust hole E is formed.

In this way, the stepped space ST of the first cover 100a may provide a discharge path for the exhaust gas discharged from the second battery cell 10b, and the stepped space ST of the second cover 100b. ) may provide an exhaust path for exhaust gas discharged from the first battery cell 10a. Accordingly, in the first and second battery cells 10a and 10b, respective exhaust paths are secured through the stepped space ST of the first cover 100a or the stepped space ST of the second cover 100b. can be

In one embodiment of the present invention, the first end of the first and second battery cells (10a, 10b) by arranging the first and second battery cells (10a, 10b) at a level offset from each other at positions adjacent to each other, (11) and the second end (12) form a step difference (d1, d2) between the first end (11) or the second end (12) relatively concavely drawn over the stepped space (ST) By providing, an exhaust path is provided so that the exhaust gas discharged through the relatively concave first end 11 or second end 12 can be discharged to the outside through the stepped space ST. At this time, an exhaust hole E may be formed in the relatively concave first end 11 or second end 12, and in one embodiment of the present invention, the relatively concave retracted second battery The first end 11 of the cell 10b and the second end 12 of the first battery cell 10a may form an anode side on which the exhaust hole E is formed, and the first end 11 of the first battery cell 10a may form a relatively convexly protruding first end 11 . The first end 11 of the first battery cell 10a and the second end 12 of the second battery cell 10b may form a negative electrode side.

13 is a perspective view of the first tab plate shown in FIG. 11 .

11 and 13 together, a first tab for electrically connecting the first ends 11 of the first and second battery cells 10a and 10b to the outside of the first cover 100a A plate 110a may be disposed. The first tab plate 110a includes a flat body part M seated on the first cover 100a, and the first and second battery cells 10a and 10b from the body part M. ) may include first and second contact portions C1 and C2 protruding to different depths toward the first end 11 .

The body part M may be disposed on the first cover 100a and may extend flatly on the first cover 100a. The body part M is provided with a first cover 100a by first and second contact parts C1 and C2 respectively coupled to the first ends 11 of the first and second battery cells 10a and 10b. ) can be fixed on the

The first and second contact portions C1 and C2 form contact with the first ends 11 of the first and second battery cells 10a and 10b exposed through the first terminal hole 101 ′, , may be formed to a sufficient depth to reach the first end 11 of the first and second battery cells 10a and 10b.

The first contact portion C1 is formed from the body portion M disposed on the first cover 100a through the first terminal hole 101 ′ of the first cover 100a, more specifically, the protrusion P. It may be coupled to the first end 11 of the relatively convexly protruding first battery cell 10a. The second contact portion C2 includes a step space ST outside the first cover 100a, more specifically, the inlet portion R, from the body portion M disposed on the first cover 100a, and the first It may be coupled to the first end 11 of the second battery cell 10b which is relatively concavely introduced through the terminal hole 101 ′ continuously. As such, the first and second contact portions C1 and C2 protrude to different depths from the body portion M, and are formed with the first end 11 of the relatively protruding first battery cell 10a and , may be coupled to the first end 11 of the relatively retracted second battery cell 10b, respectively, and as shown in FIG. 13 , the second contact portion than the protrusion depth z1 of the first contact portion C1 The protrusion depth z2 of (C2) may be formed to be relatively deep.

The first and second contact portions C1 and C2 protrude to different depths from the body portion M so as to come into contact with the first ends 11 of the first and second battery cells 10a and 10b that are stepped from each other. , is not arranged on the same plane as the body portion (M). The first and second contact portions C1 and C2 protruding from the body portion M disposed on the first cover 100a are connected to the first ends 11 of the first and second battery cells 10a and 10b and This is because, in order to form the contact, the first and second contact portions C1 and C2 need to be formed to a depth sufficient to penetrate at least the first terminal hole 101 ′ of the first cover 100a.

The first and second contact portions C1 and C2 are gradually reduced in radius along the protrusion depth from the main body M to reach the minimum radius at the first ends of the first and second battery cells 10a and 10b ( 11) and may be formed in a cylindrical shape having a cross-section that is reduced according to the protrusion depth. The first and second contact portions C1 and C2 are formed with a radius that is reduced according to the protrusion depth from the body portion M, and are coupled to the central portion of the first end 11 with a minimum radius, whereby the first end 11 ), an exhaust path may be secured through an exhaust hole (E, see FIG. 12 ) formed outside the central portion.

The first and second contact portions C1 and C2 may be formed to have a thickness smaller than that of the body portion M. The first and second contact portions C1 and C2 may be welded to the first ends 11 of the first and second battery cells 10a and 10b, and sufficient melting is performed to improve welding strength. Thus, the first and second contact portions C1 and C2 may be formed to have a relatively thin thickness. The first and second contact portions C1 and C2 may be formed through forging or press working in which a predetermined position of the raw material metal plate is stretched downward, and the first and second contact portions C1 and C2 are the raw material It can be formed to a relatively thin thickness through the stretching of the metal plate. For example, as shown in FIG. 12 , the minimum radius portion welded to the first end 11 of the second battery cell 10b among the second contact portions C2 is the first of the body portion M. The second thickness t2 may be thinner than the thickness t1. The body part M may be formed to have a relatively thick first thickness t1 in order to minimize resistance of charging and discharging currents. For example, the first thickness t1 may be formed to be 1 mm or more, and the second thickness t2 may be formed to be 0.4 mm or more. For example, the second thickness t2 may be formed between the first end 11 of the second battery cell 10b and the first end 11 of the second battery cell 10b while maintaining the shape through welding. In order to form a bond, it may have a minimum value of 0.4 mm, and the first thickness t1 is a minimum value of 1 mm to form a second thickness t2 having a minimum value of 0.4 mm through forging or press working. can have In an embodiment of the present invention, the first thickness t1 may be formed to be 1 mm, and the second thickness t2 may be formed to be 0.4 mm.

Referring to FIG. 13 , a plurality of the first and second contact parts C1 and C2 may be arranged in a row on the body part M, respectively. In the embodiment of the present invention shown in FIG. 11 , the first tab plate 110a includes a row of first battery cells 10a and a row of second battery cells 10b disposed adjacent to each other. In this case, the first ends 11 of the first battery cells 10a having the same polarity and the first ends 11 of the second battery cells 10b having the same polarity are connected to each other. While being connected in parallel, the first ends 11 of the first and second battery cells 10a and 10b having opposite polarities may be connected in series. As such, in order for the first tab plate 110a to connect the plurality of first and second battery cells 10a and 10b in series and in parallel, the first tab plate 110a has first and second batteries, respectively. A plurality of first and second contact portions C1 and C2 connected to the cells 10a and 10b may be formed, and corresponding to the first and second battery cells 10a and 10b arranged in a column, a plurality of The first and second contact portions C1 and C2 may be arranged in a row.

Referring to FIG. 11 , a second tab plate 110b for electrically connecting the second ends 12 of the first and second battery cells 10a and 10b to each other is disposed on the second cover 100b. can Similar to the first tab plate 110a, the second tab plate 110b also protrudes from the body portion M disposed on the second cover 100b to different depths from the body portion M. and first and second contact portions C1 and C2.

The second tab plate 110b includes second ends 12 of the first battery cells 10a having the same polarity, and second ends 12 of the second battery cells 10b having the same polarity. 12) may be connected in parallel, and at the same time, the second ends 12 of the first and second battery cells 10a and 10b having opposite polarities may be connected in series. To this end, a plurality of first and second contact portions C1 and C2 connected to the first and second battery cells 10a and 10b, respectively, may be formed on the second tab plate 110b.

Although the present invention has been described with reference to the embodiment shown in the accompanying drawings, this is merely exemplary, and that various modifications and equivalent other embodiments are possible therefrom by those skilled in the art to which the present invention pertains. point can be understood.

10: battery cell 10a: first battery cell
10b: second battery cell 11: first end of battery cell
12: second end of the battery cell 100: case
100a: first cover 100b: second cover
100c: middle case 101 `: first terminal hole
102': second terminal hole 103': clearance part
110a, 110b: first and second tab plates
120a.120b: first and second leads 150: bulkhead
151,152: first, second coupling portion 155: body portion of the partition wall
180: circuit board 185: switch element
A: accommodating space A1: upstream
A2: Downstream part CN: Communication part
P: protrusion R: inlet
PR: Step d1, d2: Step
ST: Step space G: Guide rib
B: blocking rib S: sealing member
S1, S2: first, second sealing member F: filling space
H: injection hole

Claims (6)

multiple battery cells;
a case providing an accommodating space for accommodating a cooling fluid for cooling the battery cell together with the battery cell;
a partition wall extending across the receiving space and dividing the receiving space into an upstream part connected to an inlet of the cooling fluid and a downstream part connected to an outlet of the cooling fluid; and
a switch element disposed on one side of the case facing the barrier rib and configured to control the flow of charge/discharge current on a charge/discharge path connected to an output terminal; and
The switch element is a battery pack disposed outside the case opposite to the inside of the case in which the partition wall is disposed. According to claim 1,
The barrier rib further includes a communication part connecting the upstream part and the downstream part to each other. 3. The method of claim 2,
The inlet and the outlet are formed on one end side of the case along the extending direction of the partition wall,
The communication part is a battery pack, characterized in that formed on the other end side of the case opposite to the one end side of the case. According to claim 1,
The switch element is a battery pack, characterized in that it is disposed on the side of the long side of the case formed along the extending direction of the partition wall. According to claim 1,
The case is
first and second covers formed to cover first and second ends opposite to each other along the length direction of the battery cells, respectively; and
and a middle case interposed between the first and second covers. 6. The method of claim 5,
A coupling position of the inlet and the outlet and the partition wall is formed on the short side of the middle case,
The switch element is a battery pack, characterized in that disposed on the long side of the middle case.

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