KR20140058915A - Sensor assembly for monitoring secondary battery and secondary battery having the sensor assembly - Google Patents

Abstract

The present invention relates to a sensor assembly for monitoring a secondary battery pack and a secondary assembly pack having a sensor assembly. The sensor assembly is for sensing a voltage of a corresponding battery cell by being connected to a cell lead of the battery cell under the state of being installed in a secondary battery pack comprising a number of battery cells, and includes: an under cover housing fixed to the side of the cell lead; an elevated housing which is comprised to be able to be elevated on the upper part of the under cover housing, and has a space part; a sensing PCB which is installed in a space part of the elevated housing and is electrically connected to the cell lead in case the elevated housing descends, and has a connector which is to be connected to an external circuit; and an elevation unit for elevating the elevated housing as to the under cover housing. A sensor assembly for monitoring a secondary battery pack and a secondary battery pack having the sensor assembly can enable an easy assembly process of a sensor assembly because connection and disconnection of the sensing PCB as to the battery cell is performed simply, and it is possible to replace the sensor assembly only, and thus it is easy to perform A/S very conveniently and to perform maintenance easily.

Description

[0001] The present invention relates to a sensor assembly for monitoring a secondary battery pack and a secondary battery pack having the sensor assembly,

The present invention relates to a sensor assembly for monitoring a secondary battery pack and a secondary battery pack having the sensor assembly.

A secondary battery is a battery capable of repeated charging and discharging, and obtains energy through an electrochemical reaction of an internal active material. The performance of such a secondary battery is influenced by, for example, the charging method, the degree of discharge, the temperature environment during storage and use, the load level, the number of charging and discharging times, and the like.

BACKGROUND OF THE INVENTION [0002] Recent secondary batteries are being developed in the field of lithium ion batteries, lithium polymer batteries or fuel cells having high energy density and light mass, and they are widely used in industrial, automobile, portable or mobile power supply apparatuses.

On the other hand, such a secondary battery is modularized to be equipped with various protection and control circuits in a bare cell and suitable for an external system to be used, and is used as a secondary battery module.

The circuit not only controls the charging and discharging of the secondary battery module but also serves to extend the service life of the secondary battery module by preventing overcharge or overheating of the secondary battery module and to prevent the risk of explosion or fire. Recently, a monitoring system has been adopted to notify the remaining discharge capacity and temperature of the secondary battery module in use in real time.

The monitoring system includes a sensing assembly that continuously senses pressure and temperature of a battery cell constituting a secondary battery module and informs the outside.

The sensing assembly includes a sensing PCB electrically connected to the cell tab of each battery cell, and informs the outside of the temperature and the output voltage of the battery cell through a connector mounted on the sensing PCB.

Meanwhile, since the conventional sensing assembly is fixed to the secondary battery module by the soldering method as described later, there is a problem that the assembling property is poor and the maintenance is very disadvantageous.

As is known in the art, the sensing assembly includes a substrate holder that is fixedly secured to a secondary battery module, and a sensor (not shown) that is fixed to the upper portion of the substrate holder It is very inconvenient to connect the connection leg fixed to the substrate holder and the circuit mounted on the sensing PCB.

That is, since the legs and the sensing PCB are integrally fixed through soldering, assembly and separation of the sensing PCB with respect to the substrate holder is troublesome.

For example, in order to fix the sensing PCB to the legs, the other end of each leg should be individually welded to the connection portion of the sensing PCB circuit. For this process, flow soldering and reflow processes must be applied The work is very inconvenient and requires very skilled skills.

In addition, if the sensing PCB's circuit pattern, components, fuses, etc. are cut or otherwise cause the sensing PCB to fail to operate, the sensing assembly can not be recovered and must be replaced.

If the sensing PCB malfunctions, it is necessary to separate the sensing PCB from the substrate holder and replace it with a new sensing PCB. As described above, since the legs of the substrate holder and the sensing PCB are completely fixed through soldering , It is very difficult to easily and cleanly separate the sensing PCB from the substrate holder. It is such a bad workability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a sensor PCB that can be easily connected and detached from a battery cell, An object of the present invention is to provide a sensor assembly for monitoring a secondary battery pack which is convenient and easy to maintain and a secondary battery pack having the sensor assembly.

To achieve the above object, the present invention provides a sensor assembly for monitoring a secondary battery pack, the sensor assembly being mounted on a secondary battery pack having a plurality of battery cells, the sensor assembly being connected to a cell lead of the battery cell, An under cover housing fixed to the side of the cell lead; A lifting and lowering housing which is vertically movable on the upper portion of the under cover housing and has a space; A sensing PCB installed in a space of the lifting housing and electrically connected to the cell lead when the lifting housing is lowered and having a connector to be connected to an external circuit; And an elevating means for elevating the elevating housing with respect to the undercover housing.

In addition, a cover for protecting the sensing PCB provided on the lifting housing is further provided on the lifting housing.

The under cover housing further comprises: And a plurality of external slits for receiving the cell lid as an internal space are formed on the side of the box, the lifting and lowering housing including: a bottom portion and a wall portion; And a lifting / lowering wall portion that is in contact with the wall portion, and the lifting and lowering housing is provided with an under cover housing And a plurality of inner slits are formed to pass through the cell leads which are introduced into the under cover housing and to be connected to the sensing PCB.

The sensing PCB may further include a connection terminal connected to the cell lead that enters the inside of the lifting housing through the inner slit.

In addition, on both sides of the outer slit of the under cover housing, when the up-and-down housing is lowered to the under cover housing, it passes through the up-and-down bottom portion of the up and down housing, And a terminal fastening portion for connecting the terminal to the cell lead.

The connection terminal may further comprise: An inserting portion connected to a circuit of the sensing PCB inserted into the sensing PCB; and an inserting portion integrally formed with the inserting portion, disposed opposite to each other on the bottom surface of the sensing PCB and being elastically deformable, And a pair of lead connecting portions connected to the cell lead.

Further, the lifting and lowering portion of the lifting housing further includes a through slit through which the terminal fastening portion passes upward, and the terminal fastening portion includes: And a pair of pressing pieces which enter the inside of the lifting housing through the through-slit to press-move the lead connecting portions in a direction close to each other.

Further, the elevating means includes: An insert nut fixed to a bottom portion of the under cover housing; and an adjusting bolt installed in the elevating housing to adjust the position of the elevating and lowering housing by screwing the insert nut into the adjusting bolt.

In addition, an elastic means for elastically supporting the lifting housing with respect to the under cover housing is further provided between the under cover housing and the lifting housing.

According to another aspect of the present invention, there is provided a rechargeable battery pack comprising: a case accommodating a plurality of battery cells; a battery connected to a cell lead of the battery cell while being fixed to the case, A secondary battery pack comprising a sensor assembly for transmitting sensed contents to the outside, the sensor assembly comprising: A lifting and lowering housing provided in the upper portion of the under cover housing and having a space, and a lifting and lowering housing provided in the space of the lifting housing and electrically connected to the cell lid when the lifting housing is lowered A sensing PCB having a connector to be connected to an external circuit; And an elevating means for elevating the elevating housing with respect to the undercover housing.

In addition, a cover for protecting the sensing PCB provided on the lifting housing is further provided on the lifting housing.

The under cover housing further comprises: And a plurality of external slits for receiving the cell lid as an internal space are formed on the side of the box, the lifting and lowering housing including: a bottom portion and a wall portion; And a lifting / lowering wall portion that is in contact with the wall portion, and the lifting and lowering housing is provided with an under cover housing And a plurality of inner slits are formed to pass through the cell leads which are introduced into the under cover housing and to be connected to the sensing PCB.

The sensing PCB may further include a connection terminal connected to the cell lead that enters the inside of the lifting housing through the inner slit.

In addition, on both sides of the outer slit of the under cover housing, when the up-and-down housing is lowered to the under cover housing, it passes through the up-and-down bottom portion of the up and down housing, And a terminal fastening portion for connecting the terminal to the cell lead.

The connection terminal may further comprise: An inserting portion connected to a circuit of the sensing PCB inserted into the sensing PCB; and an inserting portion integrally formed with the inserting portion, disposed opposite to each other on the bottom surface of the sensing PCB and being elastically deformable, And a pair of lead connecting portions connected to the cell lead.

Further, the lifting and lowering portion of the lifting housing further includes a through slit through which the terminal fastening portion passes upward, and the terminal fastening portion includes: And a pair of pressing pieces which enter the inside of the lifting housing through the through-slit to press-move the lead connecting portions in a direction close to each other.

Further, the elevating means includes: An insert nut fixed to a bottom portion of the under cover housing; and an adjusting bolt installed in the elevating housing to adjust the position of the elevating and lowering housing by screwing the insert nut into the adjusting bolt.

In addition, an elastic means for elastically supporting the lifting housing with respect to the under cover housing is further provided between the under cover housing and the lifting housing.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

The sensor assembly for monitoring the secondary battery pack of the present invention and the secondary battery pack having the sensor assembly can easily connect and detach the sensing PCB to the battery cell, Of course, only the sensor assembly can be replaced, and the A / S is very convenient and easy to maintain.

1 is a view illustrating a structure of a sensor assembly according to an embodiment of the present invention and a structure of a secondary battery pack having the sensor assembly.
2 is a perspective view of the sensor assembly shown in FIG.
3 is an exploded perspective view of the sensor assembly shown in FIG.
FIG. 4 is a view for explaining the operation of the sensor assembly shown in FIG. 1. Referring to FIG.
5 is a cutaway perspective view showing the internal structure of the sensor assembly.
6 is a perspective view illustrating a structure of a connection terminal built in the sensor assembly.
7 is a view for explaining the connection principle between the connection terminal and the cell lead.
8 is an exploded perspective view showing another example of the sensor assembly shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings.

Also, the terms " first ", " second ", " one side ", " other side ", and the like are used to distinguish one element from another, It is not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view illustrating a structure of a sensor assembly 33 according to an embodiment of the present invention and a secondary battery pack 31 having the sensor assembly.

As shown in the figure, the secondary battery pack 31 according to the present embodiment includes a box-shaped case 13, a plurality of battery cells 29 accommodated in the case 13, The battery cell 29 is fixed at the upper end in the figure and connected to the celepump 27 of each battery cell 29 via a cell lead 28 to sense the voltage of the corresponding battery cell 29, And a sensor assembly (33) for transmitting the sensor assembly (33).

In the present embodiment, the battery cells 29 are arranged in two rows in four in the case 13, and the cell taps 27 are exposed upward. The sensor assembly 33 is connected to the cell tabs 27 of the battery cells 29 through the cell leads 28 while being positioned at the center between the rows of the battery cells 29.

The cell lead 28 is welded to the cell tab 27 as a conductive metal piece, and a part of the cell lead 28 enters the sensor assembly 33 and is connected to a sensing PCB to be described later. The sensor assembly 33 continuously monitors the output power of each battery cell 29 and sends it to an external monitoring device through the connector 37c.

The sensor assembly 33 includes an under cover housing 35 fixed to an upper end of the case 13 to receive the cell lead 28 through an outer slit 35a formed on both sides thereof, A main body 37 which is mounted on the upper part of the cover housing 35 so as to be able to move up and down and incorporates a sensing PCB 37b and a main body 37 which supports the main body 37 and which faces the under cover housing 35 And includes an adjusting bolt 39 and an insert nut 41 (Fig. 4) for pressing the cell lead 28 to fix the connection terminal (45 in Fig. 8) to be described later.

2 to 4, the sensor assembly 33 is shown separately.

FIG. 2 is a perspective view of the sensor assembly 33 shown in FIG. 1, and FIG. 3 is an exploded perspective view of the sensor assembly.

As shown in the figure, the sensor assembly 33 includes an under cover housing 35 formed of a rectangular bottom portion 35d and a wall portion 35c and providing an internal space 35b opened at an upper portion thereof, And a main body 37 located at the upper portion of the cover housing 35.

The main body 37 includes a lifting housing 37e which can be lifted and lowered while being partially inserted into the inner space 35b of the under cover housing 35 and a sensing PCB 37e provided inside the lifting housing 37e And a cover 37a provided on the elevating housing 37e and covering the sensing PCB 37b.

An insert nut 41 is fixed to an inner center portion of the under cover housing 35 and an adjustment bolt 39 is provided to the main body 37.

First, the under cover housing 35 is formed of a synthetic resin and has four outer slits 35a on both sides thereof. The outer slit 35a is a groove formed in an edge portion where the bottom portion 35d and the wall portion 35c meet and passes through the cell lead 28 to receive the cell lead 28 into the inner space 35b .

A pair of mutually opposed pressing pieces 43a are integrally formed on both side portions of the outer slits 35a. The pushing piece 43a is a terminal clamping portion 43 for clamping the connection terminal 45 to be described later in the direction of arrow F in FIG. 8 so that the connection terminal 45 fixes the cell lead 28 by fixing it.

In addition, an inclined surface 43b is formed on the opposed surface of the pressing piece 43a. The inclined surface 43b is narrowed toward the bottom and presses the lead connecting portion (45b in Fig. 4) of the connecting terminal inward when the connecting terminal 45 descends.

The insert nut 41 is a nut fixed at the center of the bottom portion 35d and is a portion that engages with the adjustment bolt 39 described above. The adjustment bolt 39 is engaged with the insert nut 41 to lower the main body 37 as it is fastened.

6, the lifting housing 37e is composed of a lifting bottom portion 37m and a lifting wall portion 37k integral with the rim of the lifting bottom portion 37m, (37f).

The elevating bottom portion 37m is a rectangular plate that ascends and descends in parallel with the bottom portion 35d. The elevating wall portion 37k is supported on an inward face of the wall portion 35c by an inward face and is guided by the wall portion 35c when the elevating wall portion 37k is lifted or lowered. Needless to say, guiding means for guiding the lifting and lowering movement of the lifting housing 37e may be applied between the lifting wall portion 37k and the wall portion 35c.

Particularly, the inner slits 37d are formed on both sides of the lifting bottom 37m. The inner slit 37d meets the outer slit 35a in a state in which the lifting housing 37e is completely lowered downward as a gap formed in a corner where the lifting bottom 37m and the lifting wall 37k meet.

The cell lead 28 can sequentially pass through the outer slit 35a and the inner slit 37d and enter the space between the lead connecting portions 45b of the connecting terminal 45. [

Further, through-slits 37n are further provided on both side portions of the respective inner slits 37d. The penetrating slit 37n is a passage for upwardly passing the pressing piece 43a as shown in Fig.

A sensing PCB 37b is mounted inside the lifting housing 37e. The sensing PCB 37b senses the voltage transmitted from the battery cell 29, converts the sensed voltage into a signal, and sends the signal to an external monitoring device (not shown) through the connector 37c. The connector 37c is always exposed to the outside of the under cover housing 35.

The cover 37a serves to protect various parts located inside the lifting housing 37e and the sensing PCB 37b and the like so that impurities such as moisture and dust from the outside can penetrate into the lifting housing 37e Stop. It is of course possible to apply additional packing for this purpose.

Further, the adjustment bolt 39 is a general bolt having a head and a male thread portion, and is coupled to the insert nut 41 through the main body 37. As the adjustment bolt 39 is rotated in the locking direction with respect to the insert nut 41, the main body 37 descends toward the under cover housing 35 as described above.

FIG. 4 is a view for explaining the operation of the sensor assembly 33 shown in FIG.

That is, as shown in FIG. 4, as the adjustment bolt 39 is rotated in the direction of arrow z, the lifting housing 37e descends. When the adjustment bolt 39 is rotated in the direction opposite to the direction of arrow z, the lifting housing 37e can be lifted.

Particularly, when the adjusting bolt 39 is completely turned and separated from the insert nut 41, the lifting housing 37e can be completely detached from the under cover housing 35.

5 is a cutaway perspective view showing the internal structure of the sensor assembly 33. As shown in FIG.

Referring to FIG. 5, it can be seen that a lifting housing 37e is installed on the upper part of the under cover housing 35. The lower portion of the lifting housing 37e is guided by the wall portion 35c while being housed in the inner space 35b, and is movable up and down.

A connection terminal 45 is fixed to a lower portion of the sensing PCB 37b. The connection terminal 45 is made of a conductive metal plate such as copper or aluminum. The upper end of the connection terminal 45 is located in the space portion 37f with the upper end inset on the sensing PCB 37b.

The connection terminal 45 is located at the vertical upper portion of the inner slit 37d and is connected to the lead terminal 30b of the cell lead 28b which has entered upward through the inner slit 37d as shown in FIG. .

6 is a perspective view illustrating the structure of the connection terminal 45 built in the sensor assembly.

The connection terminal 45 according to the present embodiment is manufactured by bending a single sheet of conductive metal plate and includes an insert part 45a inserted and fixed to the sensing PCB 37b and an insert part 45a integrally formed with the insert part 45a. And a lead connecting portion 45b disposed below the sensing PCB 37b and facing each other.

The insert portion 45a is connected to a circuit (not shown) formed on the sensing PCB 37b while being fixedly mounted on the sensing PCB 37b in the thickness direction.

Further, the lead connecting portions 45b are mutually opposed and elastically deformable by an external force. When the lead connecting portions 45b are pressed toward each other in a state in which the cell leads 28 are positioned between the lead connecting portions 45b, the lead connecting portions 45b approach the cell connecting portions 45b, do.

7 is a view illustrating the connection principle between the connection terminal 45 and the cell lead 28. As shown in FIG.

As shown in the figure, as the lifting housing 37e is lowered by the under cover housing 35, the pushing piece 43a passes upward through the through-slit 37n to enter the space portion 37f. Particularly, the pressing piece 43a presses the lead connecting portion 45b in the direction of arrow F while being positioned outside the lead connecting portion 45b.

In addition, the cell lead 28 passes through the outer slit 35a and the inner slit 37d in turn, and is interposed between the lead connecting portions 45b. The pushing piece 43a presses the lead connecting portion 45b in the direction of the arrow F and the lead connecting portion 45b presses the lead connecting portion 45b in the direction of the arrow F to move the cell lead 28 .

8 is an exploded perspective view showing another example of the sensor assembly 33 shown in FIG.

Referring to the drawings, a spring 47 is further provided on the upper portion of the under cover housing 35. The spring 47 is a compression coil spring that supports the main body 37 upward.

Since the spring 47 is applied in this manner, the main body 37 pushes the under cover housing 35 upward because the adjusting bolt 39 is loosened.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that those skilled in the art, It is apparent that the present invention can be modified or improved by the present invention.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

13: Case 27:
28: cell lead 29: battery cell
31: Secondary battery pack 33: Sensor assembly
35: under cover housing 35a: outer slit
35b: inner space 35c: wall portion
35d: bottom portion 37: main body
37a: cover 37b: sensing PCB
37c: Connector 37d: Inner slit
37e: lifting housing 37f:
37k: ascending / descending wall portion 37m:
37n: through slit 39: adjusting bolt
41: insert nut 43: terminal clamp
43a: pressing piece 43b: inclined surface
45: connection terminal 45a: insert part
45b: lead connecting portion 47: spring

Claims (18)

The battery cell is connected to a cell lead of the battery cell in a state of being mounted on a secondary battery pack having a plurality of battery cells to sense a voltage of the battery cell,
An under cover housing fixed to a side of the cell lead;
A lifting and lowering housing which is vertically movable on the upper portion of the under cover housing and has a space;
A sensing PCB installed in a space of the lifting housing and electrically connected to the cell lead when the lifting housing is lowered and having a connector to be connected to an external circuit;
And elevating means for elevating and lowering the lifting housing with respect to the under cover housing. The method according to claim 1,
Wherein a cover for protecting a sensing PCB provided on the lifting housing is further provided on an upper portion of the lifting housing. 3. The method according to claim 1 or 2,
Said undercover housing comprising:
A plurality of external slits for receiving the cell lid as an internal space are formed on a side of the box, the box having a bottom and a wall and providing an internal space opened to the top,
Wherein the lifting housing comprises:
And a lifting / lowering wall portion that is in contact with the wall portion, and the lifting and lowering housing is provided with an under cover housing Wherein a plurality of internal slits are formed in the lower cover housing to allow the cell leads passing through the inside of the under cover housing to pass therethrough and to be connected to the sensing PCB. The method of claim 3,
Wherein the sensing PCB is provided with a connection terminal connected to the cell lead that has entered the inside of the lifting housing through the internal slit. 5. The method of claim 4,
The side slits of the under cover housing are inserted into the inner space of the lifting housing together with the cell lid through the lifting and lowering portion of the lifting housing when the lifting housing is lowered to the under cover housing, And a terminal fastening part for connecting the cell to the cell lead. 6. The method of claim 5,
The connection terminal comprising:
An insert unit inserted into the sensing PCB and connected to a circuit of the sensing PCB,
And a pair of lead connecting portions integrally formed with the insert portion and disposed opposite to each other on the bottom surface of the sensing PCB and being elastically deformable and connected to the cell lead by being pinched inward by the terminal clamping portion. Sensor assembly for monitoring the battery pack. The method according to claim 6,
Wherein the lifting and lowering portion of the lifting housing further includes a through slit through which the terminal fastening portion passes upward,
The terminal fastening portion comprises:
And a pair of pushing pieces that enter the inside of the lifting housing through the through-slit and press-move the lead connecting portions in a direction close to each other. The method according to claim 1,
The elevating means comprises:
An insert nut fixed to a bottom portion of the under cover housing,
And an adjusting bolt installed on the lifting housing to adjust the position of the lifting housing by screwing the nut with the insert nut. 9. The method of claim 8,
And an elastic means for elastically supporting the lifting housing with respect to the under cover housing is further provided between the under cover housing and the lifting housing. A battery pack comprising: a case accommodating a plurality of battery cells; and a sensor assembly connected to the cell leads of the battery cell in a state of being fixed to the case to sense a voltage of the battery cell and transmit sensed contents to the outside. In this case,
The sensor assembly includes:
An under cover housing fixed to the case,
A lifting and lowering housing which is vertically movable above the under cover housing and has a space;
A sensing PCB installed in a space of the lifting housing and electrically connected to the cell lead when the lifting housing is lowered and having a connector to be connected to an external circuit;
And lifting means for lifting the lifting housing with respect to the under cover housing. 11. The method of claim 10,
Wherein a cover for protecting a sensing PCB provided on the lifting housing is further provided on an upper portion of the lifting housing. The method according to claim 10 or 11,
Said undercover housing comprising:
A plurality of external slits for receiving the cell lid as an internal space are formed on a side of the box, the box having a bottom and a wall and providing an internal space opened to the top,
Wherein the lifting housing comprises:
And a lifting / lowering wall portion that is in contact with the wall portion, and the lifting and lowering housing is provided with an under cover housing Wherein a plurality of inner slits are formed to pass through the cell leads that have entered into the under cover housing to be connected to the sensing PCB when the battery is lowered. 13. The method of claim 12,
Wherein the sensing PCB is provided with a connection terminal for connecting to the cell lead that has entered the lifting housing through the inner slit. 14. The method of claim 13,
The side slits of the under cover housing are inserted into the inner space of the lifting housing together with the cell lid through the lifting and lowering portion of the lifting housing when the lifting housing is lowered to the under cover housing, And a terminal fastening portion for connecting the cell lead to the cell lead. 15. The method of claim 14,
The connection terminal comprising:
An insert unit inserted into the sensing PCB and connected to a circuit of the sensing PCB,
And a pair of lead connecting portions integrally formed with the insert portion and disposed opposite to each other on the bottom surface of the sensing PCB and being elastically deformable and connected to the cell lead by being pinched inward by the terminal clamping portion. Battery pack. 16. The method of claim 15,
Wherein the lifting and lowering portion of the lifting housing further includes a through slit through which the terminal fastening portion passes upward,
The terminal fastening portion comprises:
And a pair of pressing pieces that enter the inside of the lifting housing through the through-slit and press-move the lead connecting portions in a direction close to each other. 11. The method of claim 10,
The elevating means comprises:
An insert nut fixed to a bottom portion of the under cover housing,
Wherein the adjusting bolt is an adjusting bolt installed on the lifting housing and adjusting the position of the lifting housing by screwing the nut with the insert nut. 18. The method of claim 17,
And an elastic means for elastically supporting the lifting housing with respect to the under cover housing is further provided between the under cover housing and the lifting housing.

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