KR101817238B1 - Battery Pack - Google Patents

Abstract

The present invention relates to a battery pack to which a plug having a plug main body having at least one plug pin and a plug connecting member provided with a plug main body as one body is connected, comprising: a cell assembly; a battery pack A connector mounted on a printed circuit board which is electrically connected to the cell assembly, a connector which is coupled to the battery pack housing and the printed circuit board and which forms a passage through which one end of the connector is exposed, And a battery pack cover having a connecting portion and a recess formed inside the connector connecting portion, wherein the plug pin is connected to the terminal of the connector, and the plug connecting member is fastened to the recessed portion.

Description

Battery Pack {Battery Pack}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack, and more particularly, to a battery pack capable of improving structural stability and workability by connecting a plug connected to a connector mounted on a printed circuit board to a battery pack cover.

The secondary battery can be repeatedly charged and discharged by the electrochemical reaction between the components including the positive and negative current collectors, the separator, the active material, and the electrolyte solution. Such a secondary battery has high applicability according to the product group and has electric characteristics such as a high energy density and can be used not only as a portable device but also as an electric vehicle (EV) or a hybrid electric vehicle (HEV) driven by an electric driving source, Power storage devices (Energy Storage System) and so on. In addition, the secondary battery has been attracting attention as a new energy source for improving environment-friendliness and energy efficiency in that it has a primary advantage of drastically reducing the use of fossil fuels as well as no by-products due to the use of energy.

On the other hand, there is a growing demand for battery packs as the need for large-capacity structures including utilization as energy storage sources in recent years increases.

The battery pack includes a cell assembly having a structure in which a plurality of unit cells are connected in series and / or in parallel so as to obtain high output, a case for covering the cell assembly, Device, such as a BMS (battery management system), a current sensor, a fuse, and the like. These battery control devices can be mounted on a printed circuit board (PCB) for direct product drawing.

A connector is provided on the printed circuit board. The connector is a medium that transfers the current generated from the cell assembly to the outside during discharging and transmits current to the cell assembly during charging. These connectors are surface mounted on the printed circuit board and electrically connected. The plug can be connected to the connector for electrical connection with an external device.

On the other hand, when the plug is connected to the connector without a separate fastening means, if the external impact is applied in the opposite direction to the plug connection direction, the plug can be easily separated from the connector. Various types of fastening means have thus been previously disclosed that can secure the plug to the connector.

1, since the conventional connector 1 is soldered to the printed circuit board 2 and surface-mounted, if a shock is applied to the plug 3 from the outside, the printed circuit board 2 integrated with the connector 1 2, the connector 1 and / or the printed circuit board 2 may be damaged.

Accordingly, there is a need to develop a battery pack to which a new type of connector fastening structure capable of facilitating cable connection work to a battery pack, securing a binding force, and preventing an impact from being transferred to a printed circuit board even in an external impact.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a battery pack having a plug-in connector type input / output terminal capable of improving workability and structural stability.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to the present invention, there is provided a battery pack to which a plug having a plug main body having at least one plug pin and a plug engaging member provided as a body with the plug main body is connected, comprising: a cell assembly; A battery pack housing for housing the cell assembly; A connector mounted on a printed circuit board electrically connected to the cell assembly; And a connector connection part which is coupled to the battery pack housing and the printed circuit board with a space therebetween, and which forms a passage through which a terminal of the connector is exposed to the outside, and a recessed part formed inside the connector connection part The plug pin is connected to the terminal of the connector, and the plug fastening member is fastened to the recessed portion.

The recess may be bolted to the plug securing member.

The recess may be engaged or disengaged with the plug securing member.

The connector may be mounted on the printed circuit board such that the terminal of the connector is disposed vertically, and the connector connection portion may include a wall surrounding the connector such that an upper end of the connector extends beyond the terminal of the connector.

The recess may be integrally formed with the inner wall of the connector connection portion.

Two of the recesses may be formed on the inner wall portion of the connector connection portion with the connector interposed therebetween.

The recess may be formed inside the connector connecting portion rather than the plug pin when the plug pin is connected to the terminal of the connector.

Wherein the plug main body includes a cable jig portion into which an external cable is inserted and a plug pin insertion portion communicating with the cable jig portion and in which the plug pin is disposed, have.

Wherein the plug connecting member includes a fastening body integrally provided with the plug pin inserting portion and having an inner hollow portion and a through hole having one end portion passing through the through hole of the fastening body and the other end portion having a diameter smaller than the inner diameter of the fastening body And the bolt is fastened to the recessed portion so that the fastening body can be fixed to the recessed portion.

Two plug connectors are formed on both sides of the plug pin inserting part, and the recess part is formed on the inside of the connector connecting part with the connector interposed therebetween, and can be fastened to the plug fastening member .

According to an aspect of the present invention, even if a shock or an external force is applied by binding the plug to the battery pack lid, the impact is not transferred to the printed circuit board on which the connector is mounted, thereby improving the structural stability.

According to another aspect of the present invention, a bolting method or a hooking method is applied to the plug-in connector, thereby securing the binding force and improving the convenience of the operation.

1 is a schematic view showing a plug and a connector fastened by a conventional hooking method.
2 is a perspective view of a battery pack according to an embodiment of the present invention.
3 is a front view of the battery pack of Fig.
4 is a cross-sectional view taken along line AA in Fig.
5 is a perspective view of a plug connectable to a battery pack according to an embodiment of the present invention.
6 is a front view of a battery pack in a plug-connected state according to an embodiment of the present invention.
7 is a cross-sectional view taken along line BB of Fig.
8 is a perspective view of a battery pack lid according to an embodiment of the present invention.
Fig. 9 is a front view of Fig. 8. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 2 is a perspective view of a battery pack according to an embodiment of the present invention, FIG. 3 is a front view of the battery pack of FIG. 2, and FIG. 4 is a sectional view taken along line A-A of FIG.

2 to 4, a battery pack 10 according to an embodiment of the present invention includes a cell assembly 100, a battery pack housing 200, a printed circuit board 300, a connector 400, And a pack cover 500.

The cell assembly 100 includes a plurality of unit battery cells 110 and a cartridge 120 for holding them in a stacked state without being flowed. Each of the unit battery cells 110 includes an electrode assembly composed of a positive electrode plate, a separator, and a negative electrode plate. The positive electrode plate and the negative electrode tab protruded from the positive electrode plate and the negative electrode plate of the battery cell 110, The negative electrode lead can be electrically connected.

Each battery cell 110 may be a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery, a nickel zinc battery, or the like, which can be charged and discharged. In addition, the number of the battery cells 110 may be variously set according to a required output voltage or a charging capacity. The cell assembly 100 may be housed in the battery pack housing 200.

The battery pack housing 200 is a component that forms a frame of the battery pack 10 and is provided in the form of a rectangular parallelepiped box in the present embodiment. A plurality of unit battery packs 10 may be connected in series and / or in parallel to form a large-capacity power storage device. The battery packs 10 having a rectangular parallelepiped shape may be easily handled during operation and installation .

Of course, the battery pack housing 200 may be designed in various forms according to the size and shape of the cell assembly 100, unlike the present embodiment. In this embodiment, the printed circuit board 300 may be positioned at the tip of the battery pack housing 200. The printed circuit board 300 may be electrically connected to the cell assembly 100.

The printed circuit board 300 may be fixed to the front end of the battery pack housing 200 and the front end of the battery pack housing 200 may be connected to the battery pack lid 500 via the printed circuit board 300 The edge area can be tightened and sealed by bolting and / or hooking.

The printed circuit board 300 includes a BMS element for detecting and managing the temperature, current, and voltage of each unit battery cell 110 of the cell assembly 100, a fuse, other sensors, One or more connectors 400 may be surface mounted.

The connector 400 is a medium for transferring a current generated in the cell assembly 100 to the outside during discharging and a current to the cell assembly 100 during charging. 2 and 4, the terminal of the connector 400 may be exposed to the outside. A plug 600 to be described later (see FIG. 5) may be connected to the terminals of the exposed connector 400. A power cable (not shown) may be connected to the plug 600.

The battery pack cover 500 may be detachably coupled to the front end of the opened battery pack housing 200 to form a front portion of the battery pack 10. H2, H3, H4, H5, and H6 formed by perforating at least one area so that the connector 400, the sensor, the communication port, and the like can be connected to the external cable, Can be provided. The plurality of through holes H1, H2, H3, H4, H5, and H6 may be polygonal depending on the shape and size of the connection terminal or port.

Meanwhile, the battery pack 10 according to the present invention is designed such that the plug 600 connected to the connector 400 can be fixed to the battery pack lid 500. Hereinafter, the fastening structure of the battery pack lid 500, the connector 400, and the plug 600 will be described in detail.

FIG. 5 is a perspective view of a plug connectable to a battery pack according to an embodiment of the present invention, FIG. 6 is a front view of a battery pack connected with a plug according to an embodiment of the present invention, FIG. 8 is a perspective view of a battery pack lid according to an embodiment of the present invention, and FIG. 9 is a front view of FIG. 8. FIG.

The plug 600 having four plug pins P may be connected to the connector 400 of the battery pack 10 according to an embodiment of the present invention. The scope of the present invention is not limited thereto.

Referring to FIG. 5, a plug 600 connectable to a connector 400 of a battery pack 10 according to an embodiment of the present invention includes a plug body 610, And includes a fastening member 620.

The plug main body 610 includes a cable socket portion 611 into which an external cable is inserted and a plug pin insertion portion 614 communicating with the cable socket portion 611 and having the plug pin P disposed therein .

The cable socket portion 611 includes a plurality of cable communication holes 612 to which a plurality of cables are respectively connected and a wiring space 613 that communicates with the respective cable communication holes 612 and separates the cables by the partition walls do. The cable communication hole 612 formed in the cable socket portion 611 may be formed at a position intersecting the insertion direction of the connector 400 of the plug 600 as shown in FIG. However, the position of the cable communication hole 612 of the cable socket portion 611 may vary depending on the cable operation of the cable.

The plug pin inserting portion 614 may be formed integrally with the cable socket portion 611. The plug pin insertion portion 612 has a plurality of pin insertion holes (not shown) communicating with the wiring space 613 of the cable socket portion 611, (P) may be respectively arranged.

The plug pin inserting portion 614 can define not only the inserting direction of the plug 600 but also the depth that can be inserted. In the present embodiment, the plug pin inserting portion 614 may have various shapes such as an elliptical shape, a rod shape, a polygonal shape, and the like.

Two plug connector members 620 may be provided on both sides of the plug pin inserting portion 614, respectively. The plug securing member 620 may be integrally formed with the plug body 610 described above.

 The plug fastening member 620 includes a fastening body 621 having an internal hollow formed through hole 622 and a fastening body 621 fastened to the recessed portion 520 of the battery pack lid 500, As shown in FIG. The through hole 622 of the fastening body 621 may be formed to have a smaller inner diameter according to the depth. The bolt 623 may have a head larger than the inner diameter of the through hole 622 of the fastening body 621 and a thread screwed into a thread groove (not shown) formed in the recessed portion 520. For reference, unlike the present embodiment, the head of the bolt 623 may be formed so as to be gripped by hand for convenience of operation.

6 to 9, a battery pack lid 500 which can be fastened to the plug 600 will be described in detail.

Referring to these drawings, a battery pack lid 500 according to the present invention includes a connector connecting portion 510 and a recessed portion 520.

6 to 9, the connector connection part 510 is formed by inserting the battery pack lid 500 into a rectangular shape and forming a path through which the connector 400 surface-mounted on the printed circuit board 300 is exposed to the outside . In this embodiment, the terminals of the connector 400 are vertically arranged with respect to the printed circuit board 300 in a structure in which four connection holes to which a four-pin plug 600 can be connected are arranged in a row.

The connector connecting portion 510 may form a passageway so as to have a predetermined height corresponding to the structure of the connector 400 in which the terminal direction of the connector 400 is vertically arranged on the printed circuit board 300. The inner wall portion 511 of the connector connection portion 510 may extend longer than the terminal of the connector 400. [ That is, the connector connection part 510 forms a wall that extends beyond the terminal of the connector 400 and surrounds the connector 400, and the connector 400 is disposed in the inner space formed by the wall of the connector connection part 510 . The connector connection portion 510 may form a protective wall at the connection portion when the plug pins P are connected to the terminals of the connector.

Meanwhile, the connector connecting portion 510 is not limited to the above-described shape. That is, depending on the shape and position of the terminal of the connector 400, the connector connection portion 510 may be designed to have a different height or to form a circular or polygonal opening.

The recessed portion 520 is a portion that is fixedly coupled to the plug coupling member 620. The recessed portion 520 may be formed integrally with the inner wall portion 511 of the connector connection portion 510, as shown in FIG. More specifically, the recessed groove 520 is formed with a thread groove at its center. And the bolt 622 of the plug fastening member 620 can be fastened to the thread groove. When the bolt 622 of the plug coupling member 620 is completely fastened to the recessed portion 520, the head of the bolt 622 is fastened to the fastening body 621 of the plug fastening member 620 on the upper surface of the recessed portion 520 The plug 600 can be fixed to the recessed portion 520 by being pressed so as to be in close contact.

However, the scope of the present invention is not necessarily limited to the bolt fastening method. That is, unlike the present embodiment, the recessed groove 520 is formed with a groove for fastening with the plug 600, for example, A latching groove may be formed.

Two such recessed portions 520 may be provided in this embodiment. However, the scope of the present invention is not limited to the number of the recessed recesses 520, and therefore, one or more recessed recesses 520 may be provided depending on the shape of the plug 600 to be coupled.

The two recessed portions 520 according to the present embodiment can be positioned on both sides of the connector 400 with the connector 400 interposed therebetween and can be respectively fastened to the two plug engagement members 620 described above. At this time, it is preferable that there is no gap between the connector 400 and the recessed portion 520 so that the foreign matter can not easily flow into the battery pack lid 500.

When the plug pin insertion portion 612 is connected to the terminal of the connector 400, the recessed portion 520 is located inside the connector connection portion 510 rather than the plug pin insertion portion 612, that is, May be formed on the lower side of the inner wall portion 511 of the connector connecting portion 510 rather than the terminal portion of the connector 400. [ The formation position of the recessed portion 520 may be formed in consideration of the position of the plug connector member 620 of the plug 600 and the terminal position of the connector 400. [

The coupling force between the plug pins P and the terminals of the connector 400 can be ensured by fastening the plug coupling member 620 to the recessed portion 520. [ The plug pins P can be connected to the terminals of the connector 400 by simply inserting the rectangular plug pin insertion portion 614 into the connector connection portion 510. [

Meanwhile, the battery pack lid 500 according to the present invention can be assembled by bolt-tightening the battery pack housing 200 with the plurality of fastening holes 530. The battery pack lid 500 may further include at least one hook (not shown) to engage with the battery pack housing 200. The battery pack lid 500 may be manufactured by an injection molding method.

A method of connecting the plug 600 and the connector 400 of the battery pack will be briefly described below.

The operator first confirms the connecting direction of the plug 600 and pushes the plug pin inserting portion 612 of the plug 600 into the connector connecting portion 510. [ The plug pins can be connected to the terminals of the connector 400 when the bolts 622 of the plug fastening member 620 are fastened to the recessed portions 520 of the battery pack lid 500 using a tool. The plug 600 may be fixed to the battery pack lid 500 as an external structure independent of the connector 400 or specifically to the recessed portion 520 of the battery pack lid 500 as described above.

The battery pack according to the present invention has the terminals of the connector 400 that are surface mounted on the printed circuit board 300 and the terminals of the battery pack cover 400 that are physically fixed to the portions to which the plug 600 is electrically connected, (520) of the socket (500), the convenience of plug assembling work and the stability of the connection structure can be ensured. Therefore, even if a tension is applied to the cable connected to the plug 600 or an external impact is applied to the battery pack 10 due to any reason, the plug 600 and the connector 400 are not easily separated. The external force applied to the plug 600 is transferred to the battery pack lid 500 so that the external force is transferred to the printed circuit board 300 integrated with the connector 400, And / or the printed circuit board 300 is not damaged.

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 limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

On the other hand, in the present specification. It is to be understood that the terminology such as up, down, left, right, etc., is used for convenience of explanation, but can be expressed differently depending on the viewing position of the observer or the position of the object. To be clear to.

10: Battery pack
100: cell assembly
110: Battery cell
120: Cartridge
200: Battery pack housing
300: printed circuit board
400: Connector
500: Battery pack cover
510: connector connector
520:
600: Plug
610: Plug body
620: Plug fastening member
621: fastening body
622: Through hole
623: Bolt
P: Plug pin

Claims (10)

1. A battery pack to which a plug having a plug main body having at least one plug pin and a plug fastening member provided in one body with the plug main body is connected,
Cell assembly;
A box-shaped battery pack housing housing the cell assembly and having a front end opened;
A connector electrically connected to the cell assembly and mounted on a printed circuit board located at a front end of the battery pack housing; And
A connector connecting portion for connecting the battery pack housing and the printed circuit board with each other and forming a passage through which a terminal of the connector is exposed to the outside, and a recess formed inside the connector connecting portion; A battery pack cover,
The plug pin is connected to a terminal of the connector, the plug fastening member is fastened to the recessed portion,
Wherein the battery pack lid is hermetically sealed with an edge region of the battery pack housing to form a front portion of the battery pack,
Wherein the connector is mounted with the terminals of the connector vertically arranged on the printed circuit board and the connector connection part includes a wall surrounding the connector such that the upper end thereof extends beyond the terminal of the connector, Which is disposed in the inner space formed by the inner wall
Wherein the recess is formed integrally with an inner wall of the connector connection portion. The method according to claim 1,
And the recess is bolted to the plug securing member. The method according to claim 1,
Wherein the recess is engaged or disengaged with the plug securing member. delete delete The method according to claim 1,
Wherein two of the recesses are formed on the inner wall of the connector connection portion with the connector being interposed therebetween. The method according to claim 1,
Wherein the recess is formed inside the connector connecting portion rather than the plug pin when the plug pin is connected to the terminal of the connector. The method according to claim 1,
Wherein the plug body includes a cable socket portion into which an external cable is inserted and a plug pin insertion portion communicating with the cable socket portion and having the plug pin disposed therein,
Wherein the plug pin insertion portion is inserted into the connector. 9. The method of claim 8,
Wherein the plug connecting member includes a fastening body integrally provided with the plug pin inserting portion and having an inner hollow portion and a through hole having one end portion passing through the through hole of the fastening body and the other end portion having a diameter smaller than the inner diameter of the fastening body And includes a large bolt,
And the bolt is fastened to the recessed portion so that the fastening body is fixed to the recessed portion. 9. The method of claim 8,
Wherein the plug-fastening member is formed with two plug-ins, one on each side of the plug-
Wherein the recessed portion is formed on the inner side of the connector connection portion with two connectors interposed therebetween, and is engaged with the plug connection member.

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