KR20220034466A - Battery cell connecting apparatus and battery pack having this - Google Patents

Abstract

The present invention relates to a battery cell connection apparatus to provide increased durability and a battery pack including the same. According to the present invention, the battery cell connection apparatus comprises a main plate (10) on which a bus bar (20) is installed and a flexible printed circuit board (FPCB, 70) installed on the main plate (10). The FPCB (70) is connected to the bus bar (20). A sensing lever (60) is rotatably installed on the main plate (10). At least a part of the FPCB (70) is mounted on the outer surface of the sensing lever (60) and has a lever pocket formed in a recessed shape. A sensing unit (80) is mounted on the FPCB (70). The sensing unit (80) is inserted into the lever pocket when the FPCB (70) is mounted on the outer surface of the sensing lever (60).

Description

Battery cell connecting apparatus and battery pack including same {Battery cell connecting apparatus and battery pack having this}

The present invention relates to a battery cell connecting device and a battery pack, and more particularly, to a battery cell connecting device capable of electrically connecting a plurality of battery cells to each other and measuring the state of the battery cells, and the battery cell connecting device installed therein. It's about the battery pack.

A battery used in an electric vehicle is composed of a plurality of battery modules to supply the required amount of power. The battery module is composed of a plurality of battery cells, and when the battery cells are connected in series, a relatively large amount of power can be supplied. To this end, the positive and negative electrodes of a plurality of battery cells are sequentially connected in one battery pack, or a plurality of battery cells are connected in parallel and then connected in series again.

An electronic component called an ICB (Inter Connection Board) is sometimes used to electrically connect the battery module and the battery cells. For example, in the case of a battery module using a pouch-type secondary battery, a plurality of bus bars may be installed in the ICB, and electrode leads of battery cells may be electrically connected to the bus bars. By welding the electrode leads of the battery cells to the bus bars of the ICB, they can be electrically connected in series, parallel, or a mixed method of series and parallel.

The battery pack may further include sensing means for detecting overvoltage or overheating of some of the battery cells constituting the battery module and transmitting the detection to the BMS. Among these sensing means, the temperature sensor may be seated in the battery cell to measure the temperature of the battery cell. Such a structure is disclosed in Korean Patent Application Laid-Open No. 10-2020-0040619 and Korean Patent Publication No. 10-2020-0071614.

The sensing means may be mounted on a flexible FPCB so that the sensing means can be seated on the battery cell. When the FPCB is bent and contacts the battery cell, the sensing means may also contact the battery cell.

However, since the FPCB is a freely bendable material, it is not easy to seat it in the correct position of the battery cell. Accordingly, the FPCB may be fixed to a separate lever or the like, and may be seated on the battery cell while the lever rotates.

When the FPCB is fixed to the lever as described above, the sensing means is sandwiched between the lever and the FPCB, and may be damaged while being compressed by an external force. In order to prevent this, a protective means made of an elastic material such as a sponge may be installed between the lever and the FPCB, and the sensing means may be inserted into the protective means. However, since the protection means must be made of a soft material, there is a risk of being easily damaged such as torn during use, and the sensing means may be damaged in this process.

In addition, when an adhesive means such as double-sided tape is used to bond between the FPCB-protective means-lever, there is a problem that floatation easily occurs between them due to the characteristics of the material of the protective means.

Republic of Korea Patent Publication 10-2020-0040619 Republic of Korea Patent Publication 10-2020-0071614

SUMMARY OF THE INVENTION The present invention is to solve the problems of the prior art as described above, and an object of the present invention is to allow a sensing unit for measuring the state of a battery cell to be protected by being inserted into a sensing pocket of a lever.

Another object of the present invention is to allow the FPCB and the lever to be directly bonded without placing an intermediate between the FPCB and the lever.

According to a feature of the present invention for achieving the above object, the present invention includes a main plate on which a bus bar is installed and a flexible printed circuit board installed on the main plate. The flexible printed circuit board is connected to the bus bar. A sensing lever is rotatably installed on the main plate. At least a portion of the flexible printed circuit board is seated on an outer surface of the sensing lever, and a lever pocket is formed in a recessed shape. A sensing unit is mounted on the flexible printed circuit board. The sensing unit may be inserted into the lever pocket when the flexible printed circuit board is seated on the outer surface of the sensing lever.

And, the sensing pocket is formed through the sensing lever.

In addition, the sensing lever includes a lever body hinged to the main plate, and a sensing body provided on the opposite side of a portion hinged to the main plate in the lever body, wherein the lever pocket is recessed in the sensing body. .

And, the sensing body of the sensing lever is thicker than the lever body.

In addition, when a part of the flexible printed circuit board is seated on the sensing lever, the flexible printed circuit board covers and shields the periphery of the lever pocket.

A depth of the sensing pocket is greater than a thickness of the sensing unit and a soldering unit covering the sensing unit.

In addition, the sensing lever has a hinge part rotatably coupled to the main plate, and a part of the flexible printed circuit board passes through a space between the hinge part and the main plate and is seated on the surface of the sensing lever.

In addition, a stopper protrudes from the hinge portion of the sensing lever, and when the sensing lever is erected from the main plate, the stopper is supported on the surface of the main plate to maintain an erected state of the sensing lever.

In addition, a hinged portion in the form of tongs protrudes from the main plate, and the hinged portion includes a first fixing portion and a second fixing portion disposed along the longitudinal direction of the hinge portion of the sensing lever, the first fixing portion and The second fixing part may be assembled to the hinge fixing part in a rotatable state by supporting both sides of the hinge part, respectively.

In addition, a first locking part protrudes from the hinge part of the sensing lever, and a first locking groove engaged with the first locking part is formed in the first fixing part constituting the hinge fixing part, and the sensing lever is When rotated in a direction erected with respect to the main plate, the first locking part is fitted into the first locking groove.

In addition, a second locking portion protrudes from the hinge portion of the sensing lever, and a second locking groove engaged with the second locking portion is formed in the second fixing portion constituting the hinge fixing portion, and the sensing lever is When the main plate is rotated in a direction to be laid down, the second locking part is fitted into the second locking groove.

The battery cell connection device and the battery pack including the same according to the present invention as salvaged above have the following effects.

In the present invention, the sensing unit for measuring the state of the battery cell is mounted on an FPCB (flexible printed circuit board), and when the FPCB is coupled to the sensing lever, the sensing unit is inserted into the sensing pocket of the sensing lever to be protected. When the sensing unit is inserted into the sensing pocket, even if the FPCB and the sensing lever are coupled to each other with the sensing unit interposed therebetween, the sensing unit does not receive pressure from the middle. Accordingly, damage to the sensing unit can be prevented, thereby improving the durability of the battery cell connection device.

And, in the present invention, the sensing unit is inserted into the sensing pocket of the sensing lever, which is a kind of empty space, and the FPCB covers the periphery of the sensing pocket. As such, since the sensing unit can be safely protected in the sensing pocket even without using a protective means of an elastic material, the protective means is omitted, thereby reducing the number of parts and assembling man-hours.

In addition, in the present invention, the sensing pocket may be made through the sensing lever. When the sensing pocket is penetrated, the sensing unit may be in a state in which one of the sensing units is accommodated in an open space. As such, when the sensing unit is accommodated in an open space instead of a closed space, overheating around the sensing unit can be prevented, and accurate temperature measurement can be made.

And, in the present invention, the sensing lever may be erected or laid down on the main plate through rotation, and may maintain a standing state and a lying state. In this way, if the sensing lever can be maintained in an upright or lying state, there is an effect that the assembly and disassembly workability of the battery cell connection device is improved.

1 is a perspective view showing an embodiment of a battery cell connection device according to the present invention.
FIG. 2 is a perspective view showing the embodiment of FIG. 1 from a different angle from FIG. 1; FIG.
3 is a perspective view showing in detail a structure of a sensing lever constituting an embodiment of the present invention and a main plate to which the sensing lever is coupled;
4 is a cross-sectional view taken along line II' of FIG. 1;
5 is an exploded perspective view of a sensing module constituting an embodiment of the present invention;
6 is an exploded perspective view of a sensing module constituting an embodiment of the present invention from an angle different from that of FIG.
7 is a perspective view illustrating a flexible circuit board-sensing unit assembly and a sensing lever constituting an embodiment of the present invention in a state in which they are separated from each other;
8 is a perspective view showing a state in which a sensing module constituting an embodiment of the present invention is erected.
9 is a cross-sectional view taken along line II-II' of FIG. 8;
10 is a cross-sectional view taken along line III-III' of FIG. 8;
11 is a perspective view showing a state in which a sensing module constituting an embodiment of the present invention is laid down;
12 is a cross-sectional view taken along line IV-IV' of FIG. 11;
13 is a cross-sectional view taken along the line V-V' of FIG. 11;

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

The present invention relates to a battery pack. Here, the battery pack includes a plurality of battery cell bundles and a battery cell connecting device electrically connecting the plurality of battery cells to each other. In the present invention, the battery cell connecting device not only electrically connects a plurality of battery cells, but also serves to measure the state of the battery cells.

The state of the battery cells includes the temperature, humidity, voltage, thickness (swelling degree) of the battery cells, and the like. That is, whether the battery cells are operating under normal conditions can be known through the battery cell connection device of the present invention.

1 shows a battery cell connection device. Referring to the drawings, the skeleton of the battery cell connection device is constituted by a main plate 10 having a plate-like structure. The main plate 10 has a substantially rectangular plate shape and may be made of an insulating material. The main plate 10 is seated on the surface of the battery cell bundle (not shown), and when the main plate 10 is seated on the battery cell bundle, the bus bars 20 to be described below are the cell terminals of the battery cells. can come into natural contact with

The front surface 11a of the main plate 10 has a fusion portion 12 for fixing the bus bars 20 . The fusion portion 12 has a protrusion structure integrally formed with the main plate 10, and when the fusion portion 12 is thermally fused after passing through the fixing hole of the bus bar 20, the bus bar 20 can be fixed. The bus bar 20 does not necessarily need to be fixed by the fusion part 12, but may be fixed with a fastener such as a bolt or may be fixed with a press-fit method.

For reference, FIG. 1 shows the front side 11a of the main plate 10. On the front side 11a of the main plate 10, the bus bar 20 and a flexible printed circuit board to be described below ( 70) is settled. Also, the rear surface 11b side of the main plate 10 is shown in FIG. 2 , and the battery cell bundle described above is located on the rear surface 11b side of the main plate 10 . 1 and 2, A indicates the front side of the battery cell connection device, and B indicates the rear side of the battery cell connection device.

A plurality of bus bars 20 are installed on the main plate 10 . The bus bars 20 have a flat plate structure that can be seated on the main plate 10, and a plurality of the bus bars 20 may be disposed at intervals from each other. The bus bars 20 are components electrically connected to a plurality of cell terminals respectively protruding from the battery cells. More precisely, cell terminals (not shown) protrude between the bus bars 20 , and the protruding cell terminals may be coupled to the bus bar 20 by welding or the like.

Among the plurality of bus bars 20 , a power supply unit 22 is provided in the bus bars 20 positioned at the outermost side. The power supply unit 22 is for transmitting the power of the battery cell to the outside, to which a separate terminal (not shown) or a connector (not shown) may be connected. The power supply unit 22 may be viewed as formed by bending some of the outermost bus bars 20 .

The bus bar 20 has a board connection part 24 . The board connection part 24 is a part in contact with the connection end 77 of the flexible printed circuit board 70 to be described below. The board connection part 24 is provided on the surface of the bus bar 20 and is made of a material with high conductivity to enable electrical connection between the flexible printed circuit board 70 and the bus bar 20 . The board connection part 24 may be made integrally with the bus bar 20 or may be omitted, or it may be viewed as a part of the flexible printed circuit board 70 .

A sensing module 50 is assembled to the main plate 10 . The sensing module 50 is for measuring the state of the battery cells, and can measure the temperature, humidity, voltage, etc. of the battery cells as described above. The sensing module 50 is rotatably assembled to the main plate 10 and may be erected or laid down through rotation.

Standing up here means a state in which the sensing module 50 is rotated in a direction parallel to the main plate 10 as shown in FIGS. 1 and 2, and being laid down means the sensing module 50 as shown in FIG. 3 This means a state in which the main plate 10 is rotated in a direction orthogonal to the main plate 10 . When the sensing module 50 is laid down, it may come into contact with the surfaces of the battery cells, and the sensing unit 80 constituting the sensing module 50 may also be in a position close to the battery cells or in direct contact with the battery cells.

Referring to FIG. 2 , the sensing module 50 includes a sensing lever 60 and a flexible printed circuit board 70 (FPCB). Since the sensing unit 80 is mounted on the flexible printed circuit board 70 , it is considered that the sensing lever 60 , the flexible printed circuit board 70 and the sensing unit 80 constitute the sensing module 50 . may be The sensing module 50 may be installed at the center of the upper end of the main plate 10 . Accordingly, the sensing module 50 may measure the state of the central portion of the battery cell bundle. Alternatively, the sensing module 50 may be installed at an edge of the main plate 10 rather than the center.

The sensing lever 60 constituting the sensing module 50 is made of an insulating material. The sensing lever 60 is rotatably installed on the main plate 10 . More precisely, the sensing lever 60 has a hinge part 65 , and the hinge part 65 is rotatably assembled to the hinge fixing part 15 provided on the main plate 10 , and as a result, the sensing lever (60) can be rotated. The structure of the hinge part 65 and the hinge part 15 will be looked at in detail again below.

1 and 2, the sensing lever 60 forms a skeleton of the lever body. The lever body has a substantially long bar shape, and the sensing pocket 62 is provided at the upper side, and the hinge part 65 is provided at the opposite lower side. And at least a portion of the flexible printed circuit board 70 is coupled to the surface of the lever body.

The lever body has a sensing body 61 . The sensing body 61 is integrally connected with the lever body, and is a part in which the sensing pocket 62 is provided. In this embodiment, the sensing body 61 is provided on the upper portion of the lever body. The sensing pocket 62 is formed through the sensing body 61 , and a sensing unit 80 to be described below is accommodated in the sensing pocket 62 .

In this embodiment, the sensing pocket 62 is made to penetrate the sensing body 61 . Accordingly, as shown in FIG. 1 , the sensing unit 80 may be exposed through a portion open to one side of the sensing pocket 62 . In this case, either one of the sensing unit 80 may be in a state accommodated in an open space. As such, when the sensing unit 80 is accommodated in an open space rather than a closed space, it is possible to prevent overheating of the vicinity of the sensing unit 80, and accurate temperature measurement can be made. Alternatively, the sensing pocket 62 may have a structure in which either side is blocked without penetrating the sensing body 61 .

The sensing body 61 of the sensing lever 60 is thicker than the lever body. This is to ensure that the depth of the sensing pocket 62 is sufficiently deep. Referring to FIG. 4 , it can be seen that the thickness of the sensing body 61 is three times or greater than that of the rest of the sensing lever 60 . Accordingly, the depth of the sensing pocket 62 is formed sufficiently deep, and the separation distance from the sensing unit 80 to the opposite entrance (the lower end in reference to FIG. 4 ) can be sufficiently secured.

A portion of the flexible printed circuit board 70 is coupled to the sensing lever 60 . The flexible printed circuit board 70 is made of a thin and flexible material. Most of the flexible printed circuit board 70 is seated and fixed on the front surface 11a of the main plate 10 , and a part is fixed to the sensing lever 60 . The flexible printed circuit board 70 may be fixed to the main plate 10 through the fusion portion 12 of the main plate 10 . The flexible printed circuit board 70 has a built-in circuit part capable of passing current therein.

In this embodiment, the flexible printed circuit board 70 may play a role of electrically connecting the plurality of bus bars 20 and a role of measuring the state of the battery cell bundle. To this end, the flexible printed circuit board 70 includes a sensing board unit 71 coupled to the sensing module 50 , and a power board unit 75 coupled to the bus bars 20 .

First, looking at the power board part 75 of the flexible printed circuit board 70 , as shown in FIG. 1 , the power board part 75 is in close contact with the front surface 11a of the main plate 10 . The power board part 75 is installed across the top of the main plate 10 . The power board part 75 has a connection end 77 . The connecting end 77 is electrically connected to the substrate connecting portion 24 of the bus bar 20 . The connecting end 77 may be welded or bonded to the substrate connecting portion 24 on the surface of the bus bar 20 in an overlapping state.

A sensing board part 71 is connected to one side of the power board part 75 . The sensing substrate unit 71 extends upward from the power substrate unit 75 . In this embodiment, the sensing substrate unit 71 forms a space between the sensing lever 60 and the main plate 10 . After passing through and protruding, it may be seated on the surface of the sensing lever 60 . Referring to FIG. 8 , the sensing substrate part 71 passes through a gap between the hinge part 65 of the sensing lever 60 and the hinge fixing part 15 of the main plate 10 .

5 and 6, the components constituting the sensing module 50 are shown in an exploded state. An adhesive part is attached to the surface of the sensing lever 60 constituting the sensing module 50 , and in this embodiment, the adhesive part may include a first adhesive part T1 and a second adhesive part T2 . Both the first adhesive part T1 and the second adhesive part T2 may be formed of double-sided tape.

The first adhesive part T1 is for bonding between the sensing body 61 of the sensing lever 60 and the sensing board part 71 of the flexible printed circuit board 70 . One side of the first adhesive part T1 is attached to the surface of the sensing body 61 around the periphery of the sensing pocket 62 . To this end, a through portion T1a exposing the sensing pocket 62 may be formed in the first adhesive portion T1. In addition, the opposite surface of the first adhesive part T1 is adhered to the surface of the sensing board part 71 of the flexible printed circuit board 70 .

The second adhesive portion T2 is for bonding between the lever body of the sensing lever 60 and the lower portion of the sensing substrate 71 in the flexible printed circuit board 70 . One side of the second adhesive part T2 is adhered to the surface of the lever body along the longitudinal direction of the lever body. In addition, the opposite surface of the second adhesive part T2 is adhered to the lower surface of the sensing board part 71 in the flexible printed circuit board 70 . The first adhesive part T1 and the second adhesive part T2 may be omitted or replaced with an adhesive.

The sensing unit 80 is mounted on the flexible printed circuit board 70 . The mounting part is mounted on the sensing board part 71 of the flexible printed circuit board 70 , and is electrically connected to a land part (not shown) of the sensing board part 71 . In this embodiment, the sensing unit 80 is a temperature sensor for measuring the temperature of the battery cells. After the sensing unit 80 is mounted on the surface of the sensing substrate unit 71 , it is soldered and covered by the soldering unit 83 . Here, the soldering part 83 may be applied to the sensing substrate part 71 by a surface mounter technology (SMT) method. That is, in a state in which the sensing unit 80 is mounted on the surface of the sensing substrate unit 71 , cream solder may be applied to the surface of the sensing substrate unit 71 to be cured (soldered).

7 shows a state in which the sensing unit 80 is soldered to the flexible printed circuit board 70, and one side of the flexible printed circuit board 70 has the first adhesive part T1 and the second adhesive part ( The sensing lever 60 in a state where T2) is attached is shown. In this state, when the flexible printed circuit board 70 is in close contact with the sensing lever 60, the first adhesive part T1 and the second adhesive part T2 attach the flexible printed circuit board 70 to the sensing lever ( 60) is attached to it.

In this case, the sensing unit 80 is naturally located in the sensing pocket 62 . That is, the sensing unit 80 may not be sandwiched between the flexible printed circuit board 70 and the sensing lever 60 , but may be located in the sensing pocket 62 , which is an empty space. Therefore, even when an external force compressing between the flexible printed circuit board 70 and the sensing lever 60 is applied, the pressure is not transmitted to the sensing unit 80 .

This state can be more clearly confirmed in FIG. 4 . When the sensing unit 80 is accommodated in the sensing pocket 62 , the left and right and upper portions of the sensing unit 80 are spaced apart from the peripheral portion. And, one side of the sensing pocket 62 opened to both sides (up/down in reference to FIG. 4) is shielded by the sensing board unit 71 of the flexible printed circuit board 70, and the other side is opened in an open state. can be maintained Through this open portion, the sensing unit 80 itself may also be dissipated to some extent, and more accurate temperature measurement may be possible.

Next, a structure in which the sensing lever 60 is rotatably assembled to the main plate 10 will be described with reference to FIGS. 8 to 13 . For reference, FIGS. 8 to 10 show a state in which the sensing lever 60 is erected, and FIGS. 11 to 13 show a state in which the sensing lever 60 is laid down.

The sensing lever 60 has a hinge part 65 that is rotatably coupled to the main plate 10, and the main plate 10 has a hinge part for rotatably fixing the hinge part 65 ( 15) exists.

Looking at the hinged portion 15, the hinged portion 15 has a kind of tongs. More precisely, the hinge fixing part 15 includes a pair of first fixing parts 15a and second fixing parts 15b arranged along the longitudinal direction of the hinge part 65 of the sensing lever 60 . accomplish The first fixing part 15a and the second fixing part 15b respectively support both sides of the hinge part 65 so that the hinge part 65 is rotatable. can be assembled on For reference, in this embodiment, the hinge fixing part 15 is divided into a first fixing part 15a relatively close to the sensing lever 60 and a second fixing part 15b far from the sensing lever 60 .

The hinge part 65 may be inserted into the first fixing part 15a and the second fixing part 15b while widening a gap. 9, it can be seen that the hinge part 65 is inserted into the hinge groove 16 made inside the first fixing part 15a and the second fixing part 15b. That is, the hinge groove 16 is formed between the first fixing part 15a and the second fixing part 15b.

The hinge fixing part 15 has a first locking groove 15a1. The first locking groove 15a1 may be formed in a shape that is relatively more depressed in the hinge groove 16 . A first locking part 66 of the hinge part 65 to be described below may be inserted into the first locking groove 15a1. When the first locking part 66 is inserted into the first locking groove 15a1, the first locking part 66 is caught in the first locking groove 15a1, and the sensing lever 60 is It does not rotate arbitrarily from a standing state to a lying state. In this embodiment, the first locking groove (15a1) is formed in the first fixing part (15a).

For reference, in the state in which the sensing lever 60 is erected as shown in FIG. 9 , the first locking part 66 is fitted into the first locking groove 15a1 , but as shown in FIG. 12 , when the sensing lever 60 is laid down The first locking part 66 may be deviated from the state fitted in the first locking groove 15a1.

10 and 13 showing the cross-sectional shape of the second fixing part 15b, the second fixing part 15b of the hinge fixing part 15 has a second locking groove 15b1. The second locking groove 15b1 may be formed in a shape that is relatively more depressed in the hinge groove 16 . A second locking part 67 of the hinge part 65 to be described below may be inserted into the second locking groove 15b1. When the second locking part 67 is inserted into the second locking groove 15b1, the second locking part 67 is caught in the second locking groove 15b1, and the sensing lever 60 is It does not rotate arbitrarily from a lying state to a standing state.

For reference, as shown in FIG. 10 , in a state in which the sensing lever 60 is erected, the second locking part 67 is not fitted into the second locking groove 15b1, but when the sensing lever 60 is laid down, the second The locking part 67 is fitted into the second locking groove 15b1. Therefore, the sensing lever 60 may not be arbitrarily rotated in the counterclockwise direction (the direction in which the sensing lever 60 is erected) with reference to FIG. 13 .

Next, looking at the hinge part 65 , the hinge part 65 is fitted into the hinge fixing part 15 in a cylindrical shape long in approximately one direction. The hinge part 65 is provided at the lower end of the sensing lever 60 and extends relatively longer than the left and right widths of the sensing lever 60 .

A plurality of partition portions 68 protrude from the hinge portion 65 in the longitudinal direction of the hinge portion 65 . The partition portion 68 has a larger diameter than the rest of the hinge portion 65 . A plurality of partition portions 68 may be provided in the hinge portion 65 so as to be respectively disposed on both sides of the hinge portion 15 . The partition part 68 may contact the outer surface of the hinge part 15 when the hinge part 65 rotates and guide it to rotate stably.

Referring to FIG. 9 , the hinge part 65 includes a stopper 69 . The stopper 69 is a portion extending from the hinge portion 65 and is in close contact with the front surface 11a of the main plate 10 when the sensing lever 60 is erected. When the stopper 69 is in close contact with the front surface 11a of the main plate 10, the rotation of the sensing lever 60 is limited. More precisely, the sensing lever 60 can no longer rotate clockwise with reference to FIG. 9 .

A first locking part 66 protrudes from the hinge part 65 . The first locking part 66 is made by further protruding either side of the hinge part 65 . The cross section of the hinge part 65 does not have a circular shape due to the first locking part 66 . The first locking part 66 may be fitted into the first locking groove 15a1 of the first fixing part 15a described above. When the first locking part 66 is inserted into the first locking groove 15a1, the sensing lever 60 may maintain an erected angle. Of course, the stopper 69 described above may also have the same function.

At this time, the first locking part 66 is fitted into the first locking groove 15a1 when the sensing lever 60 is in an upright state. Therefore, in the process of rotating the sensing lever 60 in the direction of standing, the operator feels that the first locking part 66 is caught the moment it is fitted into the first locking groove 15a1, and the sensing lever 60 is You can sense that it is fully erected.

Referring to FIG. 13 , a second locking part 67 protrudes from the hinge part 65 . The second locking part 67 is made by further protruding either side of the hinge part 65 . The cross section of the hinge part 65 does not have a circular shape due to the second locking part 67 . The second locking part 67 may be fitted into the second locking groove 15b1 of the second fixing part 15b described above. When the second locking part 67 is fitted into the second locking groove 15b1, the sensing lever 60 may maintain a reclined angle.

At this time, the second locking part 67 is fitted into the second locking groove 15b1 when the sensing lever 60 is in a lying state. Therefore, in the process of rotating the sensing lever 60 in the direction in which the operator lays down, the sensing lever 60 is You can sense that it is fully reclined.

In the above, even though it has been described that all components constituting the embodiment according to the present invention operate in combination or combined into one, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, terms such as "comprises", "comprises" or "have" described above mean that the corresponding component may be inherent, unless otherwise specified, excluding other components. Rather, it should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: main plate 15: hinge high government
15a: first fixing part 15b: second fixing part
16: hinge groove 20: bus bar
50: sensing module 60: sensing lever
65: hinge portion 66: first engaging portion
67: second locking part 70: flexible printed circuit board

Claims (12)

the main plate on which the bus bar is installed;
a flexible printed circuit board installed on the main plate and connected to the bus bar;
A sensing lever rotatably installed on the main plate, at least a portion of the flexible printed circuit board is seated on an outer surface, and a lever pocket is recessed; and
and a sensing unit mounted on the flexible printed circuit board and inserted into the lever pocket when the flexible printed circuit board is seated on the outer surface of the sensing lever.
The battery cell connection device according to claim 1, wherein the sensing pocket is formed through the sensing lever.
The method according to claim 1, wherein the sensing lever is
a lever body hinged to the main plate; and
Battery cell connection device comprising a; provided on the opposite side of the portion hinged to the main plate in the lever body, the sensing body in which the lever pocket is recessed.
The battery cell connecting device according to claim 3, wherein the sensing body of the sensing lever is thicker than the lever body.
The battery cell connection device according to claim 1, wherein when a part of the flexible printed circuit board is seated on the sensing lever, the flexible printed circuit board covers and shields the periphery of the lever pocket.
The battery cell connecting device of claim 1 , wherein a depth of the sensing pocket is greater than a thickness of the sensing unit and a soldering unit covering the sensing unit.
The method according to claim 1, wherein the sensing lever has a hinge portion rotatably coupled to the main plate, and a part of the flexible printed circuit board passes through a space between the hinge portion and the main plate and is seated on the surface of the sensing lever. battery cell connector.
The battery cell connection according to claim 1, wherein a stopper protrudes from the hinge portion of the sensing lever, and when the sensing lever is erected from the main plate, the stopper is supported on the surface of the main plate to maintain the state in which the sensing lever is erected. Device.
The method according to claim 7, The main plate has a hinged portion protruding in the form of tongs, the hinge portion comprises a first fixing portion and a second fixing portion disposed along the longitudinal direction of the hinge portion of the sensing lever, the first The fixing part and the second fixing part support both sides of the hinge part, respectively, so that the hinge part is rotatable and the battery cell connection device can be assembled to the hinge part.
The method according to claim 9, wherein a first locking portion protrudes from the hinge portion of the sensing lever, the first fixing portion constituting the hinge fixing portion is formed with a first locking groove engaged with the first locking portion, the sensing When the lever is rotated in a direction erected with respect to the main plate, the first locking part is fitted into the first locking groove.
The method according to claim 10, A second locking portion protrudes from the hinge portion of the sensing lever, the second fixing portion constituting the hinge fixing portion is formed with a second locking groove engaged with the second locking portion, the sensing When the lever is rotated in a direction in which it is laid down with respect to the main plate, the second locking part is fitted into the second locking groove.
a plurality of battery cells;
Including; a connection device for electrically connecting the cell terminals of the battery cell to each other;
The connecting device is
a main plate on which a plurality of bus bars in contact with the cell terminals of the battery cells are installed;
a flexible printed circuit board installed on the main plate and connected to the bus bar;
A sensing lever rotatably installed on the main plate, at least a portion of the flexible printed circuit board is seated on an outer surface, and a lever pocket is recessed; and
A battery pack comprising a; a sensing unit mounted on the flexible printed circuit board, inserted into the lever pocket when the flexible printed circuit board is seated on the outer surface of the sensing lever, and measuring the state of the battery cells.

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