KR200492625Y1 - Connecting device for battery cell - Google Patents

Abstract

The present invention relates to a battery cell connection device, and more particularly, it is possible to stably maintain the electrical and physical connection relationship without welding, and to perform the assembly and disassembly process of the battery cell simply and quickly. It relates to a battery cell connection device.
A battery cell connection device according to the present invention is a battery cell connection device, comprising: a main bus bar electrically connected to a terminal of the battery cell; An auxiliary bus bar coupled to the main bus bar; A bus bar fastening member for fastening the auxiliary bus bar to the main bus bar; A crimping member that presses the main bus bar to reinforce a bonding strength with the terminal; And a pressing unit operating member for applying a pressing force to the pressing member.

Description

Battery cell connection device {CONNECTING DEVICE FOR BATTERY CELL}

The present invention relates to a battery cell connection device, and more particularly, it is possible to stably maintain the electrical and physical connection relationship without welding, and to perform the assembly and disassembly process of the battery cell simply and quickly. It relates to a battery cell connection device.

In general, devices that require energy to drive such as moving devices such as automobiles, industrial facilities, and various mechanical devices mainly used fossil energy such as petroleum and coal, but in recent years, electricity is used due to depletion of fossil energy or environmental pollution. It is being replaced by a circle.

For example, various mobile devices such as electric vehicles have built-in rechargeable battery modules that supply power used as energy sources. As a prior art for such a rechargeable battery module, a battery module and a battery pack for a secondary battery disclosed in Korean Patent Laid-Open Publication No. 10-2015-0121519 have been proposed as shown in FIG. 1.

The battery module 100 for a secondary battery has a plurality of battery cells 110, a pair of external terminals 130 connected to electrodes of each battery cell 110, and the battery cells 110 to each other. It is configured to include a plurality of bus bars (120a) (120b) welded to the external terminal 130 so as to be connected.

As the conventional battery module for secondary battery 100 as described above is manufactured in a manner in which the external terminal 130 is welded to each battery cell 110 and the external terminal 130 is welded to the bus bars 120a and 120b, There are limitations that cause various problems as follows.

First, since the conventional battery module 100 for secondary batteries has a structure that relies on a welding method for assembly and electrical connection of the battery cells, it causes damage to the battery cell terminals, resulting in a decrease in durability, and an increase in manufacturing labor costs and manufacturing time. There is a disadvantage in that productivity is low and manufacturing cost is remarkably high.

In addition, the conventional battery module for secondary battery 100 requires welding equipment and skilled workers as the assembly and electrical connection of the battery cells depend on the welding method, and not only requires a lot of electric energy during welding, but also safety accidents such as burns or fire during welding. There is a drawback that there is always the risk of

In the conventional battery module 100 for secondary batteries, as the assembly and electrical connection depend on the welding method, damage to the battery cell is caused by the heat load applied during welding, and when the skill of the welder is low, not only the defective product is mass produced but also the battery cell It has a serious problem that it is difficult to replace and cannot be reused.

In particular, electric buses with more daily mileage compared to general electric vehicles have a relatively high rate of damage to the battery due to frequent charging and discharging, requiring frequent replacement, but disassembling, manufacturing, and reassembling the battery cells from the busbar. Since the welding process is carried out, the replacement work is very difficult and takes a long period of time, resulting in an increase in maintenance costs as well as an increase in downtime (downtime) of the electric bus.

In addition, since the electric bus welding part is deteriorated in conductivity as well as corrosion as time elapses, the overall performance of the module is deteriorated, leading to enormous hindrance to the operation of the electric bus.

Korean Utility Model Publication No. 20-2012-0005517 "Vehicle battery device and lithium iron battery module" Korean Patent Application Publication No. 10-2015-0067694 "Connecting device for battery module" Korean Patent Laid-Open Publication No. 10-2015-0121519 "Battery module and battery pack with welding structure that can secure safety in case of short circuit"

The present design was proposed in light of the above, and it is possible to stably maintain electrical and physical connection relationships without welding, and to perform the assembly and disassembly process of the battery cell simply and quickly, thereby reducing the manufacturing cost and Its purpose is to provide a battery cell connection device that can reduce maintenance costs and secure operation stability and safety.

In order to achieve the above object, the battery cell connection device according to the present invention is a battery cell connection device, comprising: a main bus bar electrically connected to a terminal of the battery cell; An auxiliary bus bar coupled to the main bus bar; A bus bar fastening member for fastening the auxiliary bus bar to the main bus bar; A crimping member that presses the main bus bar to reinforce a bonding strength with the terminal; And a pressing unit operating member for applying a pressing force to the pressing member.

Preferably, the auxiliary bus bar may be provided with a pressing member moving groove formed in the auxiliary bus bar body and into which the pressing member is movably inserted, and a pressing member operating hole in which the pressing member operating member is installed.

The pressing member may include a pressing body inserted into the pressing member moving groove and a moving guide protrusion protruding from the pressing body.

The auxiliary bus bar may have a protrusion guide groove formed at a position facing the moving guide protrusion to be inserted.

In addition, the main bus bar may have a bus bar fastening hole through which the bus bar fastening member is fastened to the plate-shaped member.

The auxiliary bus bar is formed with an auxiliary bus bar fastening hole corresponding to the bus bar fastening hole, and the protrusion guide groove is concave and formed to communicate with the depth of the pressing member moving groove from the bottom of the auxiliary bus bar body. I can.

It is preferable that the bus bar fastening member is formed of a countersunk bolt, and the crimping unit actuating member is formed of a set screw, and is fastened so as not to be exposed to the outside while installed on the auxiliary bus bar.

According to the battery cell connection device according to the present invention, the electrical connection of the battery cells and the mechanical assembly process are simultaneously performed by a simple assembly method without welding, so that the manufacturing process is concise, simple and quick, and thus productivity can be improved. In addition, manufacturing costs can be reduced, and accidents such as safety accidents and fires caused by welding can be prevented in advance. Since it is possible to prevent damage to the battery cell due to heat load due to welding, durability can be improved, and there is an effect of preventing occurrence of defective products due to welding failure.

In particular, when the battery cell connection device according to an embodiment of the present invention is applied to an electric bus that requires frequent replacement of battery cells due to a relatively long daily mileage, the battery cell can be replaced easily and quickly, thereby reducing maintenance costs. It can be done and has the advantage of reducing downtime.

1 is a view for explaining a conventional battery cell connection structure;
2 is a schematic cross-sectional view showing an installed state of a battery cell connection device according to an embodiment of the present invention;
Figure 3 is an exploded perspective view of the main parts of the battery cell connection device according to an embodiment of the present invention,
4A and 4B are views for explaining an auxiliary bus bar of a battery cell connection device according to an embodiment of the present invention, and FIG. 4A is a cross-sectional view and FIG. 4B is a perspective view showing an internal structure.
5 is a perspective view showing a crimping member of the battery cell connection device according to an embodiment of the present invention;
6 is an enlarged cross-sectional view of a main part of a battery cell connection device according to an embodiment of the present invention;
7 is a schematic cross-sectional view for explaining the operation of the battery cell connection device according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 to 7 of the accompanying drawings, but the same reference numerals are assigned to the same components in FIGS. 2 to 7.

On the other hand, in each drawing, a detailed description of a configuration that can be easily recognized by a person of ordinary skill in the art from a general technique, and actions and effects therefor, will be simplified or omitted.

2 is a schematic cross-sectional view showing an installed state of a battery cell connection device according to an embodiment of the present invention, showing a longitudinal sectional structure of a battery assembly. 3 is an exploded perspective view of main parts of a battery cell connection device according to an embodiment of the present invention, FIG. 4 is a view for explaining an auxiliary bus bar of the battery cell connection device according to an embodiment of the present invention, and FIG. 4A is a cross-sectional view; 4B is a perspective view showing the internal structure. Figure 5 is a perspective view showing a pressing member of the battery cell connection device according to an embodiment of the present invention, Figure 6 is an enlarged cross-sectional view of the main part of the battery cell connection device according to an embodiment of the present invention.

2 to 6, the battery cell connection device according to an embodiment of the present invention is configured to assemble and disassemble a plurality of battery cells (c) in an assembly method without welding, and the main bus bar ( 1), including the auxiliary bus bar (2), the bus bar fastening member (3), a crimping member (4) and a crimping unit operating member (5).

The main bus bar (1) is a component electrically connected to the terminal (c1) of the battery cell (c), and is fixed to the PCB fixing board (p) installed on the frame (not shown) of the battery cell assembly (s). have. At this time, the main bus bar 1 is bonded to a terminal (not shown) formed on a circuit (not shown) mounted on the PCB fixing substrate p by soldering or the like.

In addition, the main bus bar 1 is formed of a strip-shaped plate member made of a conductive material such as copper (Cu), and a bus bar fastening hole corresponding to the auxiliary bus bar fastening hole described later so that the bus bar fastening member 3 is fastened. (12) has a formed structure.

The auxiliary bus bar (2) is a component coupled to the main bus bar (1), and the crimping member (4) is accommodated in the auxiliary bus bar body (21) formed of a plate-like member made of a conductive material such as copper (Cu). A pressing member moving groove 22 is formed on the inside to move.

In addition, the auxiliary bus bar (2) is a crimping member operating hole (23) in which the crimping unit operating member (5) is movably installed, and a bus bar fastening member (3) for fastening with the main bus bar (1) is fastened. The auxiliary bus bar fastening hole 24 is formed. At this time, the crimping member operating hole 23 is made of a hole which is perforated to communicate with the crimping member moving groove 22 and has a female thread.

The bus bar fastening member (3) is a component for fastening the auxiliary bus bar (2) to the main bus bar (1), if it is a fastening means capable of fastening the auxiliary bus bar (2) to the main bus bar (1) Although it can be configured without any particular limitation, in the present embodiment, it is composed of a flat head bolt so that it is not exposed to the outside in a state fastened to the auxiliary bus bar (2).

The crimping member 4 is a component that performs a function of reinforcing the binding strength with the terminal by pressing the main bus bar 1, and is formed of a conductive material such as copper, and is formed in the crimping member moving groove 22. It is composed of a pressing body 41 to be inserted, and a moving guide protrusion 42 protruding from the pressing body 41.

The pressure body 41 is configured in a substantially rectangular plate shape so as to be fitted with the compression member moving groove 22 so that it does not rotate during the fastening operation of the compression unit operating member 5, but may be formed of various polygonal plates such as a triangular plate. .

The moving guide protrusion 42 is a member protruding and formed on both sides of the center of the pressing body 41 in the form of a protrusion, a function of guiding the lowering motion of the crimping member 4 and a state in which the crimping member is crimped to the surface of the terminal In contact with the surface of the main bus bar (1), it performs the function of a stopper preventing the pressing member from descending any more.

On the other hand, the auxiliary bus bar 2 has a protrusion guide groove 25 formed at a position facing the moving guide protrusion 42 to be inserted. The protrusion guide groove 25 is recessed from the bottom of the auxiliary bus bar body 21 to a depth equal to that of the pressing member moving groove 22.

The crimping unit operating member 5 is a component that applies a pressing force to the crimping member 4, and can be configured in various ways without any particular limitation on shape or structure if the crimping member can be moved, but in this embodiment, the auxiliary bus bar It is composed of a set screw so that it is not exposed to the outside when it is connected to (2). In this way, when the crimping part operating member 5 is composed of a set screw, it is not exposed to the outside in a fastened state, so it does not cause interference with adjacent parts or structures, thereby improving convenience in manufacturing the battery cell assembly. There is an advantage that can be implemented compactly.

The battery cell (c) is a secondary battery in which electric energy is stored, and any secondary battery capable of storing electric energy, such as a lithium ion battery or a lithium ion polymer battery, can be applied without particular limitation.

For example, the battery cell (c) is formed in the shape of a square battery pack as shown in Fig. 2, but if the battery cell connection device according to the present invention can be installed, there is no special limitation such as a square column shape, a cylinder shape, etc. You can choose to configure it. In addition, referring to FIG. 2, a plurality of battery cells are arranged along the front and rear directions, and a thin-film terminal c1 that can be folded up and down is formed so that adjacent terminals are gathered and electrically connected to each other and assembled in a series manner. .

Hereinafter, the operation of the battery cell connection device according to an embodiment of the present invention will be briefly described.

7 is a schematic cross-sectional view for explaining the operation of the battery cell connection device according to an embodiment of the present invention.

Referring to FIG. 7, when connecting a plurality of battery cells (c) in a series manner using a battery cell connection device according to an embodiment of the present invention, a PCB fixed substrate installed on a frame (not shown) of a battery cell assembly Fix the main bus bar (1) on (p), and the terminals (c) of the battery cells (c) adjacent to the upper surface of the main bus bar (1) are collected and raised.

In this state, the crimping member 4 is inserted into the crimping member moving groove 22 of the auxiliary bus bar 2, and the bus bar fastening hole 12 and the auxiliary bus bar fastening hole 24 are assisted to be located on the same vertical line. The auxiliary bus bar 2 is fixed to the main bus bar 1 by superimposing the bus bar 2 on the main bus bar 1 to position it, and performing a fastening operation using the bus bar fastening member 3.

Thereafter, when the crimping unit operating member 5 is inserted and fastened into the crimping member operating hole 23 of the auxiliary bus bar 2, the lower end of the crimping unit actuating member 5 presses the upper surface of the crimping member 4 Therefore, after moving toward the terminal (c1) of the battery cell (c) on the upper surface of the main bus bar (1), the bottom surface of the crimping member applies a pressing force, so the main bus bar (1) and the battery cell terminal (c1) Is electrically and physically tightly bound.

On the contrary, if you want to release the binding relationship between the main bus bar 1 and the battery cell terminal c1, if you rotate the crimping part operating member 5 in the reverse direction, the binding force between the crimping member 4 and the main bus bar 1 Since this is released, the terminal c1 can be separated. In this state, the bus bar fastening member 3 is removed, and the auxiliary bus bar 2 is disassembled to complete the disassembly work. After the damaged battery cell c is removed and replaced with a new one, the battery cell assembly in which the plurality of battery cells are connected in series may be reassembled by performing the same or similar method of assembling the battery cell connection device described above.

As described above, in the battery cell connection device according to an embodiment of the present invention, the auxiliary bus bar 2 is fixed to the main bus bar 1 by using the bus bar fastening member 3, and the crimping part operating member 5 The electrical connection and mechanical assembly process of the battery cells (c) are simultaneously performed by pressing the terminal to the main bus bar (1) using a crimping member (4) that is interlocked with the fastening operation of the battery, so the manufacturing process is concise and simple. As a result, it is possible to expect a reduction in manufacturing cost by improving productivity by shortening manufacturing time and reducing manufacturing labor costs.

And, as in the prior art, not only by welding and electrically connecting the battery cells, but also by fixing the terminals of the cells by the pressing operation of the pressing member 4, as well as by pressing the main bus bar and the even surface of the pressing member 4 As the additional function of unevenly spreading the irregular side of the terminal can be implemented at the same time, securing the cross-sectional area of the electrode for improving the electrical conductivity can be realized, so by maximizing the large-capacity high-current discharge through securing the cross-sectional area of the electrode, the efficiency can be improved. . In addition, skilled workers are not required, electric energy required during welding is unnecessary, and accidents such as safety accidents or fires caused by welding can be prevented in advance. In addition, since it is possible to prevent damage to the battery cell due to heat load caused by welding, durability can be improved, and defective products due to welding defects can be prevented.

In particular, when the battery cell connection device according to an embodiment of the present invention is applied to an electric bus that requires frequent replacement of battery cells due to a relatively large daily mileage, the battery cell can be replaced easily and quickly, thereby reducing maintenance costs. It can be done, and there is an advantage in that it can reduce the stopping time.

The configuration and operation of the battery cell connection device according to an embodiment of the present invention have been described above, but this is only an example, and those of ordinary skill in the art have the above implementation within the scope not departing from the technical idea of the present invention. It will be appreciated that it is possible to substitute and modify some of the examples.

Therefore, it should be understood that the scope of protection of the present invention extends to the invention and its equivalents described in the claims.

c: battery cell c1: terminal
1: Main bus bar 12: Bus bar signing
2: auxiliary bus bar 21: auxiliary bus bar body
22: crimping member moving groove 23: crimping member operating hole
24: Subsidiary bus bar consolidation 25: Protrusion guide groove
3: Bus bar fastening member 4: Crimping member
41: pressurized body 42: inner protrusion
5: crimping part operating member

Claims (5)

In the battery cell connection device,
A main bus bar electrically connected to a terminal of the battery cell;
An auxiliary bus bar coupled to the main bus bar;
A bus bar fastening member for fastening the auxiliary bus bar to the main bus bar;
A crimping member that presses the main bus bar to reinforce a bonding strength with the terminal; And
Including; a compression unit operating member for applying a pressing force to the compression member,
The auxiliary bus bar is formed in the auxiliary bus bar body and includes a pressing member moving groove into which the pressing member is movably inserted, and a pressing member operating hole in which the pressing member operating member is installed,
The pressing member includes a pressing body inserted into the pressing member moving groove, and a moving guide protrusion protruding from the pressing body,
The auxiliary bus bar is a battery cell connecting device, characterized in that the protrusion guide groove is formed at a position opposite to the moving guide protrusion to be inserted.
delete delete The method of claim 1,
The main bus bar has a structure in which a bus bar fastening hole through which the bus bar fastening member is fastened is formed on a plate-shaped member,
The auxiliary bus bar is formed with an auxiliary bus bar fastening hole corresponding to the bus bar fastening hole, and the protruding guide groove is concave to communicate with the depth of the compression member moving groove from the bottom of the auxiliary bus bar body. Battery cell connection device.
The method of claim 4,
The bus bar fastening member is a flat head bolt, and the crimping unit actuating member is composed of a set screw, and is fastened so as not to be exposed to the outside when installed on the auxiliary bus bar.

Images