KR101750088B1 - Battery Module Having Ring Terminal Fixing Structure - Google Patents

Abstract

The present invention relates to a battery module including a plurality of unit cells capable of charging and discharging, the battery module comprising bus bars for electrically connecting the unit cells, ring terminals connected to electrical connection parts of the unit cells, and a plurality of wires connected to the battery modules, the wires connecting the plurality of unit cells to the plurality of battery modules, And a bus bar mounting member including fixing portions and ring terminal guides for preventing rotation of the ring terminals.

Description

[0001] The present invention relates to a battery module having a ring terminal fixing structure,

The present invention relates to a battery module including a structure for fixing a ring terminal for voltage detection.

BACKGROUND ART [0002] In recent years, a rechargeable secondary battery has been widely used as an energy source for wireless mobile devices, and has been widely used as an energy source for electric vehicles EV, a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (Plug-In HEV), and the like.

In addition, technologies related to a power storage device that stores electricity and supplies it to a power system in a stable manner at a required time are being developed. Power storage devices are devices that store energy when power demand is low, and supply power in the event of an overload or an emergency, thereby providing an effect of improving power quality and energy use efficiency. In particular, residential power storage devices and industrial or commercial medium power storage devices are rapidly gaining market share in conjunction with Smart Grid technology.

Meanwhile, in order for the battery module to provide the output and capacity required by a predetermined device or device, a plurality of battery cells must be electrically connected in series or parallel manner to form a battery module. As the capacity of the battery module increases, It should be easy and stable.

Particularly, when a plurality of battery cells are used to constitute a battery module, safety and operating efficiency of the battery module are greatly problematic when some battery cells are over-voltage, over-current or overheated. Therefore, Do. Accordingly, a battery management system (BMS), which is a safety system, is provided to detect overvoltage, overcurrent, overheat, and the like to control / protect the battery pack.

The BMS measures the voltage by connecting the ring terminals to the electrode terminals of the battery cells. The step of connecting the ring terminals to the electrode terminal is performed together with the step of connecting the battery cells in series and / or in parallel using a bus bar. In this process, due to the characteristics of the ring terminal that can not be structurally fixed and easily rotated, there is a problem that adjacent parts are broken due to the rotation of the ring terminal in the process of fastening the bus and ring terminals to the electrode terminals by bolts Occurs.

Further, due to the lack of assembly tolerance due to complicated connection and wiring structure, there is a problem that the wire is damaged by the assembling tool in the assembling process due to the ring terminal, resulting in peeling of the coating and short circuit.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery module in which a wire connected to a ring terminal is damaged or a damage due to rotation of a ring terminal is prevented to reduce a defective rate in a process of connecting a bus bar and a ring terminal to electrode terminals, .

According to an aspect of the present invention,

A battery module comprising a plurality of unit cells capable of charging and discharging,

Bus bars for electrical connection of the unit cells;

A ring terminal connected to an electrical connection portion of the unit cells for voltage measurement, and wires for transmitting a voltage detected at the ring terminals to a battery management system (BMS);

Wire fixing parts mounted on the outer surface of the battery module corresponding to the electrical connection parts of the unit cells and fixedly fixing the wires, and ring terminal guides for preventing rotation of the ring terminals A bus bar mounting member;

As shown in FIG.

That is, the battery module according to the present invention includes a wire fixing portion for fixing the wires at a predetermined position, and a bus bar mounting member formed with ring terminal guides for preventing rotation of the ring terminals, In the process of connecting the terminal to the electrode terminal, the damage of the wire and the breakage of the component due to the rotation of the ring terminal can be prevented, the defect rate can be lowered, and the safety can be improved.

In one specific example, the unit cell may be a plate-shaped battery cell structure or a structure in which two or more plate-shaped battery cells are mounted on a cell cover in a state that electrode terminals are exposed.

The plate-shaped battery cell may be, for example, a pouch-shaped battery cell having a structure in which an electrode assembly is embedded in a battery case of a laminate sheet including a resin layer and a metal layer, and then an outer circumferential surface is sealed.

The battery cell is not particularly limited as long as it is capable of providing a high voltage and a high current when the battery module or the battery pack is constructed. For example, the battery cell may be a lithium secondary battery having a large energy storage amount per volume.

In another example of the unit cell, the cell cover may be composed of a pair of sheath members mutually coupled to cover the outer surfaces of the battery cells except the electrode terminal portion. For example, two battery cells may be mounted on the cell cover, and the two battery cells may be stacked so that the electrode terminals of the same polarity are connected to each other in series or parallel.

The plurality of unit cells are arranged in a vertical direction from the ground in a state in which electrode terminals are formed on one side and a pair of unit cells are arranged in a plane with a structure in which electrode terminals face each other Thereby forming a unit cell laminate.

In addition, a BMS (Battery Management System) for controlling the operation of the battery module may be mounted on one side of the unit cell stack, and the ring terminals may be electrically connected to the BMS, Can be measured.

The pair of unit cells arranged in a plane may be connected in parallel, the unit cells arranged in a vertical direction may be connected in series, and the ring terminals may be connected to a series connection portion of unit cells .

At this time, the wire fixing portions may be vertically arranged corresponding to the arrangement of the ring terminals connected to the series connection portions of the unit cells. Thus, the wires connected to the ring terminals can each be structured to be fixed in place by the wire fixing portion.

In one specific example, the wire fixing portions may be formed of two hook structures in which the wires are protruded to be inserted and fixed inward. However, it is needless to say that various structures can be used as long as the structure fixes the wires in place.

The bus bar mounting member may have a rectangular shape and may have side walls protruding along the outer circumferential surface to protect the connection structure of the bus bar and the ring terminal from the outside.

At this time, the wire fixing portions may be formed on the inner side surface of the side wall of the bus bar mounting member, and the wires may be fixed along the inner side surface of the side wall.

The electrode terminal may be bent upward or downward so that one end thereof can be coupled to the bus bar. That is, the electrode terminals may be bent in the direction of the bus bar mounting member so that vertically arranged unit cells can be connected in series by bus bars.

At one end of the bent electrode terminal and at both ends of the bus bar, coupling parts may be formed, and the coupling parts may be electrically and mechanically fastened by a bolt, a bolt-nut or a press-fitting nut. Accordingly, one of the unit cells arranged vertically may be connected to one end of the bus bar, and the other unit cell may be connected to the other end of the bus bar.

A ring terminal may be coupled between the bus bar and the bolt, or between the bus bar and the bolt-nut, or between the bus bar and the indentation nut. Therefore, in the process of rotating the bolt, the bolt-nut or the press-fitting nut in order to fasten the bus bar and the ring terminal to the electrode terminal, the ring terminal may rotate together to cause disconnection or damage. The rotation of the ring terminals can be prevented.

Specifically, the ring terminal includes a terminal coupling portion coupled to a series connection portion of the unit cells, and a terminal body connecting the terminal coupling portion and the wire. The ring terminal guide connects the terminal body to a fixed position And the rotation of the terminal coupling portion is suppressed.

The ring terminal guide may have a protruding structure for supporting one side or both side surfaces of the terminal body.

That is, the ring terminal guide may have a protruding structure for supporting one side surface of the terminal main body for suppressing clockwise rotation of the terminal engaging part. On the contrary, it may be structured to suppress rotation in the counterclockwise direction. It is needless to say that the present invention may be configured to suppress both the clockwise and counterclockwise rotations.

The present invention also provides a battery pack including the battery module as a unit module.

The battery pack may be manufactured by assembling the battery module as a unit module according to a desired output and capacity. In consideration of mounting efficiency, structural stability, etc., the battery pack may include a household power supply unit, Power supplies such as emergency power supplies, computer room power supplies, portable power supplies, medical equipment power supplies, fire extinguishing equipment power supplies, alarm equipment power supplies, evacuation facility power supplies, electric vehicles, hybrid electric vehicles, or plug-in hybrid electric vehicles But the scope of application is not limited to these.

Accordingly, the present invention provides a device including the battery pack as a power source, and the device is specifically applicable to a household power supply device, a public utility power supply device, a large shop power supply device, an emergency power supply device, A medical device power supply, a fire extinguishing equipment power supply, an alarm facility power supply, an evacuation facility power supply, an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, the battery module according to the present invention includes the wire fixing portion for fixing the wire in the correct position, and the bus bar mounting member formed with the ring terminal guides for preventing rotation of the ring terminals, In the process of connecting the bus bar and the ring terminal to the electrode terminal, it is possible to prevent damage to the wire and to prevent breakage of the surrounding parts due to rotation of the ring terminal, thereby reducing the defect rate and improving the safety.

1 is a perspective view of a battery cell constituting a unit cell in the battery module of the present invention;
2 is a perspective view of a unit cell made up of the battery cells of FIG. 1;
3 is a side view of a battery module according to one embodiment of the present invention;
4 is an enlarged view of a portion A in Fig. 3;
Fig. 5 is an enlarged view of a portion B in Fig.
Fig. 6 is a schematic view of a structure in which a ring terminal is fixed to a bus bar mounting member of Fig. 3;

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 1 is a perspective view of a battery cell constituting a unit cell in the battery module of the present invention, and FIG. 2 is a perspective view of a unit cell composed of the battery cell of FIG.

1 and 2, the battery cell 10 includes an electrode assembly (not shown) and an electrolyte solution (not shown) in a battery case 13 of a laminate sheet, and the outer peripheral surface 14 is sealed Structure. The electrode tabs (11, 12) are formed on one side of the battery case (13).

The unit cell 110 has a structure in which two plate-shaped battery cells 10 are mounted on the cell cover 116 with the electrode terminals 112 and 114 exposed on one side. The cell cover 116 of the unit cell is composed of a pair of exterior members that are mutually coupled to cover the outer surface of the battery cells 10 except for the electrode terminals 112 and 114, The battery cells 10 are stacked such that the electrode tabs 11 and 12 of the same polarity are connected to each other while being in contact with each other.

FIG. 3 is a side view of a battery module according to an embodiment of the present invention, and FIG. 4 is an enlarged view of a portion A in FIG. Fig. 5 is an enlarged view of a portion B in Fig. 4, and Fig. 6 is a schematic view of a structure in which a ring terminal is fixed to a bus bar mounting member in Fig.

3 to 6 together with FIG. 2, the battery module 100 includes a plurality of unit cells 110, bus bars 120, ring terminals 130, a bus bar mounting member 140, And a BMS (not shown).

The plurality of unit cells 110 are arranged such that a pair of unit cells 110 are arranged in a plane with a structure in which the electrode terminals 112 and 114 face each other, So that a unit cell laminate is formed.

The planarly connected unit cells 110 are connected in parallel, and the unit cells 110 arranged in a vertical direction are connected in series.

A bus bar mounting member 140 is mounted at a portion corresponding to a portion where the electrode terminals 112 and 114 of the unit cells 110 are connected.

The electrode terminals 112 and 124 of the unit cells 110 are bent at the ends of the bus bar mounting member 140 in the direction of the bus bar mounting member 140. The bent ends of the electrode terminals 112 and 124 and the bus bars 120 (Not shown) are formed at both side ends of the base plate (not shown).

The electrode terminals 112 and 124 and the coupling parts of the bus bar 120 are electrically and mechanically fastened by the bolts 150. A ring terminal 130 is coupled between the bus bar 120 and the bolt 150.

The ring terminal 130 includes a terminal coupling portion 132 having a fastener 133 coupled to the series connection portion of the unit cells 110 and a terminal coupling portion 132 connecting the terminal coupling portion 132 and the wire 160 And a terminal body (134). That is, the terminal connecting portion 132 measures the voltage and sends the voltage data measured by the BMS via the wire 134.

The bus bar attaching member 140 has a rectangular structure, and a side wall 145 protrudes along the outer circumferential surface.

Wire fixing portions 142 for fixing the wires 160 in place are formed inside the side wall 145 of the bus bar mounting member 140 so that the wires 160 are electrically connected to the wire fixing portions 142 So that they are closely attached to the inside of the side wall 145. The wire fixing portions 142 are respectively formed at positions corresponding to the arrangement of the ring terminals 130 to efficiently fix the wires 160. The structure of the wire fixing portions 142 is formed by two hook structures protruded so that the wires 160 are inserted and fixed inside.

Ring terminal guides 146 for preventing the rotation of the terminal main body 134 of the ring terminal 130 are formed in the bus bar mounting member 140. The ring terminal guides 146 are formed so as to protrude from both side surfaces of the terminal body 134.

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

Claims (20)

A battery module comprising a plurality of unit cells capable of charging and discharging,
Bus bars for electrical connection of the unit cells;
A ring terminal connected to an electrical connection portion of the unit cells for voltage measurement, and wires for transmitting a voltage detected at the ring terminals to a battery management system (BMS);
Wire fixing parts mounted on the outer surface of the battery module corresponding to the electrical connection parts of the unit cells and fixedly fixing the wires, and ring terminal guides for preventing rotation of the ring terminals A bus bar mounting member;
Lt; / RTI >
Wherein the unit cells are formed on one side of the unit cells, and the pair of unit cells are vertically stacked from the ground in a height direction in a state in which the pair of unit cells are arranged in a plane- A battery management system (BMS) is mounted on one side of the cell laminate,
Wherein the pair of unit cells arranged in a plane are connected in parallel, the unit cells arranged in a vertical direction are connected in series, the ring terminals are connected to a series connection portion of the unit cells,
The ring terminal includes a terminal coupling portion coupled to a series connection portion of the unit cells, and a terminal body connecting the terminal coupling portion and the wire. The ring terminal guide fixes the terminal body in a fixed position, Wherein the battery module has a structure that suppresses rotation of the battery module. The battery module according to claim 1, wherein the unit cell is a plate-shaped battery cell structure, or two or more plate-shaped battery cells are mounted on a cell cover with electrode terminals exposed. The battery module according to claim 2, wherein the plate-shaped battery cell has a structure in which an electrode assembly is embedded in a case of a laminate sheet including a metal layer and a resin layer, and then an outer circumferential surface is sealed. The battery module according to claim 2, wherein the plate-shaped battery cell is a lithium secondary battery. [3] The battery module of claim 2, wherein the cell cover comprises a pair of exterior members coupled to each other so as to surround an outer surface of the battery cells except an electrode terminal portion. delete delete The battery module according to claim 1, wherein the wire fixing portions are vertically arranged corresponding to the arrangement of the ring terminals connected to the series connection portions of the unit cells. [2] The battery module of claim 1, wherein the wire fixing portions are formed in two hooks protruding from the inside of the wire fixing portions. The battery module according to claim 1, wherein the bus bar mounting member has a rectangular structure and a side wall protrudes along an outer circumferential surface thereof. 11. The battery module according to claim 10, wherein the wire fixing portions are formed on inner side surfaces of side walls of the bus bar mounting member. The battery module according to claim 1, wherein the electrode terminal is bent upward or downward at one end so as to be coupled to the bus bar. 13. The electrical connector according to claim 12, wherein the bent ends of the electrode terminals and the opposite ends of the bus bar are formed with engaging portions, and the engaging portions are electrically and mechanically fastened by bolts, bolts-nuts or press- A battery module characterized by. 14. The battery module of claim 13, wherein the ring terminal is coupled between the bus bar and the bolt, or between the bus bar and the bolt-nut, or between the bus bar and the indentation nut. delete The battery module according to claim 1, wherein the ring terminal guide comprises a protruding structure for supporting one side or both sides of the terminal body. 17. The battery module according to claim 16, wherein the ring terminal guide comprises a protruding structure for supporting one side of a terminal wire for suppressing clockwise rotation of the terminal end. A battery pack comprising a battery module according to any one of claims 1 to 5, 8 to 14, 16 and 17 as a unit module. A device according to claim 18, comprising a battery pack. 20. The system of claim 19, wherein the device is a power supply for household use, a utility power supply, a power supply for a large store, an emergency power supply, a computer room power supply, a portable power supply, , An evacuation facility power supply, an electric car, a hybrid electric car, or a plug-in hybrid electric car.

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