KR101588573B1 - Unit battery cell and battery cell assembly comprising thereof - Google Patents

Abstract

The present invention relates to a unit battery cell and a battery cell assembly structure including the unit battery cell. The battery cell assembly includes a pair of battery cells each having a positive electrode and a negative electrode formed thereon and arranged so that the same electrodes are adjacent to each other, A first lead plate electrically connecting the positive electrodes of the pair of battery cells to each other, and a second lead plate electrically connecting the negative electrodes of the pair of battery cells at both ends thereof, A plurality of unit battery cells arranged in parallel to each other so as to be adjacent to the lead plate and one end connected to the center of the first lead plate of one of the plurality of unit battery cells, And a plurality of unit battery cells connected in series, And a mounting frame in which a mounting groove is formed on one side of the inner surface opposite to the one side and on which the opposite ends of the plurality of unit battery cells are seated and on which a mounting portion for mounting the bus bar is formed.
According to the present invention, since the cell balancing is optimized, the life of the unit battery cell is prolonged.
Also, by providing a structure in which the unit battery cells can be easily replaced, it is possible to replace only the unit battery cells in which the defects are generated, thereby reducing the maintenance cost.
In addition, when the unit battery cells are constituted by a pair of battery cells, the replacement cost can be reduced when replacing the unit battery cells in which the defects are generated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a unit battery cell and a battery cell assembly including the unit battery cell,

The present invention relates to a unit battery cell and a battery cell assembly structure including the unit battery cell. More particularly, the present invention relates to a unit battery cell having a structure in which cell balancing is optimized while minimizing a replacement cost, Structure of the battery cell.

2. Description of the Related Art [0002] With the rapid development of industries such as electronics, communication, and the like, portable electronic devices such as mobile phones and notebooks are increasing in popularity. As a power source for such portable electronic devices, rechargeable secondary batteries are widely used in consideration of economical efficiency.

In recent years, secondary batteries have been used not only in portable electronic devices such as mobile phones and notebook computers, but also in medium to large-sized devices such as power tools, electric bicycles, and automobiles that require high output and high power.

For this reason, in order to apply the secondary battery to the above-mentioned middle- or large-sized apparatus requiring high power and high power, a plurality of secondary batteries are connected in parallel to form unit cells, Are mainly used.

As shown in FIG. 1, Korean Patent Registration No. 1108180 discloses a battery pack having a plurality of battery cells 200 disposed side by side, a casing 100 accommodating the battery cells, a casing 100 disposed inside the casing 100, And a terminal (400) connected to the tab (300) in the casing (100) and exposed to the outside of the casing (100) at the other end thereof. The large capacity battery pack .

However, in the battery pack described above, each electrode of the battery cell 200 arranged in parallel is connected to one tab 300 through welding, and power is drawn out through the terminal 400 connected to the tab 300 So that it is difficult to maintain cell balancing because the distances between the terminals 400 for drawing power and the electrodes of the battery cells 200 are different from each other.

When a failure occurs in any one of the battery cells 200 due to the structure in which each electrode of the battery cell 200 is connected to one tab 300 through welding, There is a problem that the maintenance cost is increased due to the replacement.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above problems, and it is an object of the present invention to provide a battery cell in which a connection tab is formed at the center of a connection tab electrically connecting the positive electrode and the negative electrode of each battery cell, And a balancing-optimized unit battery cell.

It is another object of the present invention to provide a battery cell assembly structure in which a unit battery cell can be easily replaced.

According to an aspect of the present invention, there is provided a battery pack comprising: a pair of battery cells each having a positive electrode and a negative electrode formed thereon and arranged in parallel so that the same electrodes are adjacent to each other; And a first connection plate formed at a center of the first connection tab, and both ends of the first connection plate electrically connect the negative electrodes of the pair of battery cells to each other And a second connection plate formed at a center of the second connection tab, and a second lead plate including a first connection tab, a second connection tab, and a second connection tab formed at the center of the second connection tab.

Here, the first connection tab may have a first fastening hole formed on one side thereof, and the second connection tab may have a second fastening hole formed on one side thereof.

According to another aspect of the present invention, there is provided a battery pack comprising: a pair of battery cells each having a positive electrode and a negative electrode formed thereon and arranged so that the same electrodes are adjacent to each other; And a second lead plate electrically connecting between the negative electrodes of the pair of battery cells at both ends of the first lead plate, wherein the first lead plate is adjacent to the second lead plate And one end of the unit battery cell is coupled to the center of the first lead plate of one of the plurality of unit battery cells and the other end of the unit battery cell is coupled to the second lead of the other unit battery cell, A pair of bus bars connected to the center of the plate and connecting the plurality of unit battery cells in series, Disposed doedoe, that both ends of the plurality of unit battery cells mounted on the inner surface side opposing recess is formed, and the battery cell assembly structure including a mounting frame mounted portion is formed which is mounted the bus bar is provided on the outer surface side.

Here, the first lead plate and the second lead plate may be detachably coupled to the mounting portion through the bus bar.

The mounting frame may further include a contact prevention unit for preventing contact between the first and second lead plates not connected through the bus bar.

It is further preferable that the mounting frame further includes a support portion that is recessed inward between the mounting portion and the mounting portion adjacent to the mounting portion, and supports one side of the opposite ends of the plurality of unit battery cells.

On the other hand, the internal wiring alignment means includes at least one fixing clip extending from one side of the mounting frame and spaced apart from one side of the external surface of the mounting portion, and at least one fixing piece extending from one side of the external surface of the supporting portion .

It is further preferable that external wiring alignment means is further formed which includes at least a pair of fixing protrusions that are spaced apart from each other and protrude outward from one side of the mounting frame.

According to the present invention, since the cell balancing is optimized, the life of the unit battery cell is prolonged.

Also, by providing a structure in which the unit battery cells can be easily replaced, it is possible to replace only the unit battery cells in which the defects are generated, thereby reducing the maintenance cost.

In addition, when the unit battery cells are constituted by a pair of battery cells, the replacement cost can be reduced when replacing the unit battery cells in which the defects are generated.

1 is an exploded perspective view showing a conventional battery pack.
2 is a perspective view of a unit battery cell according to an embodiment of the present invention.
3 is an exploded perspective view of a unit battery cell according to an embodiment of the present invention.
4 is a perspective view of a battery cell assembly structure according to an embodiment of the present invention;
5 is a bottom perspective view of a battery cell assembly structure according to an embodiment of the present invention.
6 is an exploded perspective view from above of a battery assembly structure according to an embodiment of the present invention;
FIG. 7 is an exploded perspective view of a battery assembly according to an embodiment of the present invention, viewed from below. FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings. It is to be noted that like elements in the drawings are represented by the same reference numerals as possible. Further, detailed description of known functions and configurations that may unnecessarily obscure the gist of the invention will be omitted.

FIG. 2 is a perspective view of a unit battery cell according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a unit battery cell according to an embodiment of the present invention.

2 and 3, a unit battery cell 1 according to an embodiment of the present invention includes a pair of battery cells 10, a first lead plate 20, and a second lead plate 30 .

The pair of battery cells 10 may be square or circular as a secondary battery that repeatedly performs charging and discharging. However, the present invention is not limited thereto, and the battery cell 10 is shown as a cylindrical lithium-ion battery.

In this battery cell 10, the positive electrode 11 is formed at one end and the negative electrode 12 is formed at the other end.

The first lead plate 20 includes a first connection tab 21 for electrically connecting the positive electrodes 11 of the pair of battery cells 10 and a second connection tab 21 electrically connected to the first connection tab 21 1 connection tab 22 as shown in FIG.

The second lead plate 30 has a second connection tab 31 electrically connecting the cathode electrodes 12 of each of the pair of battery cells 10 and a second connection tab 31 electrically connected to the second connection tab 31 And two connection tabs 32.

The first connection tab 21 and the second connection tab 31 are plate-shaped members, and both ends of the first connection tab 21 and the second connection tab 31 are welded between the positive electrode 11 and the negative electrode 12 of each pair of battery cells 10 And serves to connect the pair of battery cells 10 in parallel.

The first connection tab 22 and the second connection tab 32 are formed in a plate shape and are vertically bent outwardly from one side of the center of the first connection tab 21 and the second connection tab 31, When the unit battery cells 1 are electrically connected to each other, the unit battery cells 1 serve to provide a connection region between the unit battery cells 1.

The first connection tab 22 is formed with a first connection hole 23 for receiving a fastening bolt and the second connection tab 32 has a second connection hole 33 for receiving a fastening bolt at one side thereof, .

The first lead plate 20 and the second lead plate 30 may be made of a material such as copper, nickel, or aluminum having good electrical conductivity.

As described above, the unit battery cell 1 according to the embodiment of the present invention includes the first lead plate 20 and the second lead plate 30, which connect the pair of battery cells 10 in parallel, The first connection tabs 22 and the second connection tabs 32 are formed on the unit battery cells 1, thereby providing a structure in which cell balancing is optimized when the unit battery cells 1 are electrically connected to each other.

Accordingly, when power is drawn from each of the unit battery cells 1 connected to each other, each unit battery cell 1 is uniformly discharged, so that even when charging, each unit battery cell 1 can be uniformly charged, The unit battery cell 1 is prevented from being overdischarged or overcharged, thereby prolonging the life of the unit battery cell 1.

FIG. 4 is a perspective view of a battery cell assembly structure according to an embodiment of the present invention, FIG. 5 is a bottom perspective view of a battery cell assembly structure according to an embodiment of the present invention, FIG. FIG. 7 is an exploded perspective view of the battery cell assembly according to the embodiment of the present invention. FIG. 7 is an exploded perspective view of the battery cell assembly according to the embodiment of the present invention.

4 to 7, a battery cell assembly structure 2 according to an embodiment of the present invention includes a unit battery cell 1, a bus bar 40, a connection bar 50, and a mounting frame 60 .

Since the unit battery cell 1 has the same configuration as that of the embodiment of the present invention described above, a detailed description thereof will be omitted. The unit battery cell 1 has a structure in which one of the neighboring unit battery cells 1 A plurality of the first lead plates 20 of the unit battery cell 1 and the second lead plates 30 of the other unit battery cell 1 are arranged side by side so that one unit battery cell 1 The first connection tab 22 formed on the first lead plate 20 of the unit battery cell 1 and the second connection tab 32 formed on the second lead plate 30 of the other unit battery cell 1 are interconnected by a bus And the neighboring unit battery cells 1 are electrically connected to each other through the bar 40 so as to be connected in series.

Although the 13S * 2P structure in which thirteen unit battery cells 1 connected in parallel are serially connected is illustrated in this embodiment, the present invention is not limited to the above structure, and various connection structures Can be adopted.

Each unit battery cell 1 is fastened to the first fastening hole 23 formed in the first connection tab 22 and the second fastening hole 33 formed in the second connection tab 32 by fastening bolts 70 And is coupled to the bus bar 40 and the mounting frame 60, which will be described later.

As described above, each unit battery cell 1 is coupled to the bus bar 40 and the mounting frame 60 via the fastening bolts 70, so that when any one of the unit battery cells 1 is defective, The unit battery cell 1 is constructed of a pair of batteries, so that it is possible to minimize the cost required for replacement.

The bus bar 40 is formed in a plate shape and has a first fastening hole 41 through which a fastening bolt 70 is inserted in the center thereof and is fastened to the first fastening hole 41 of the mounting frame 60 62a.

The bus bars 40 are formed at both ends with second fastening holes 42 corresponding to the first fastening holes 23 or the second fastening holes 33 so that the region where the fastening bolts 70 are inserted And the fastening bolts 70 which have passed through the first fastening holes 23 or the second fastening holes 33 are inserted into the second fastening holes 42 so that both ends of the fastening bolts 70 are inserted into the first connection tabs 22, 2 connection tab 32 to connect the neighboring unit battery cells 1 in series.

The bus bar 40 is formed with a pair of fixing holes 43 between the first fastening hole 41 and the second fastening hole 42.

As described above, it is preferable to use copper, nickel, and aluminum materials having good electrical conductivity.

The connection bar 50 is a plate-shaped member and has a third fastening hole 51 at one end thereof for fastening bolts 70 inserted therein. The fastening bolts 70 fasten the fastening bolts 70, Gt; 62b. ≪ / RTI >

The connection bar 50 has a fourth fastening hole 52 corresponding to the first fastening hole 23 or the second fastening hole 33 at the other end thereof to provide a region where the fastening bolt 70 is inserted And the fastening bolt 70 passing through the first fastening hole 23 or the second fastening hole 33 is inserted into the fourth fastening hole 52 so that the first connection tab 22 or the second connection tab 32 to provide an area where power can be drawn out from the plurality of unit battery cells 1. [

Preferably, the connection bar 50 is made of copper, nickel and aluminum with good electrical conductivity.

The mounting frame 60 is a plate-like member made of a synthetic resin material having a predetermined length and is disposed at a predetermined distance from each other. The mounting frame 60, the mounting portion 62, the supporting portion 63, the contact preventing portion 64, Internal wiring alignment means 65 and external wiring alignment means 66.

The seating grooves 61 are formed on one side and the other side of the upper surface of the inner surface of the mounting frame 60 facing each other and provide a region where both ends of the plurality of unit battery cells 1 are engaged.

In this embodiment, seven unit battery cells 1 out of thirteen unit battery cells 1 connected in series are arranged in a seating groove 61 formed on one side of the inner surface of the mounting frame 60, The unit battery cells 1 are disposed in the seating grooves 61 formed on one side of the lower portion of the inner surface of the mounting frame 60. However, the present invention is not limited thereto, and the unit battery cells 1, which are connected in series, Can be formed in various structures depending on the amount of the polymer.

As described above, since the plurality of unit battery cells 1, which are connected in series by forming the seating grooves 61 on one side and the other side of the inner surface of the mounting frame 60, are stacked in two stages, The structure 2 can be made compact.

A plurality of mounting portions 62 are formed on one side of the outer surface of the mounting frame 60 and are provided with a first mounting portion 62a for providing a region where the bus bar 40 is mounted and a region for mounting the connecting bar 50 And a second mounting portion 62b.

The first mounting portion 62a has a first insert nut 62aa corresponding to the first fastening hole 41 of the bus bar 40 and a second insert nut 62b corresponding to the second fastening hole 42 on one side of the upper and lower sides, (62ab) is formed to provide a region where the fastening bolts 70 are engaged.

The first mounting portion 62a has a pair of fixing protrusions 62ac corresponding to the fixing holes 43 of the bus bar 40 on the upper and lower sides.

The fixing protrusions 62ac are inserted into the fixing holes 43 of the bus bar 40 when the bus bar 40 is coupled to the upper and lower sides of the first mounting portion 62a, 1 mounting portion 62a of the bus bar 40 by the rotational force of the fastening bolt 70 fastened to the mounting portion 62a.

The first mounting portion 62a is formed in a staggered manner in the mounting frame 60 so that the bus bar 40 can connect the neighboring unit battery cells 1 in series.

The second mounting portion 62b has a third insert nut 62ba corresponding to the third fastening hole 51 of the connecting bar and a fourth insert nut 62bb corresponding to the fourth fastening hole 52 on the upper and lower sides, Thereby providing a region where the fastening bolts 70 are engaged.

The support portions 63 are formed in the unit mounting portions 62a of the respective unit batteries 62a and 62b that are formed inwardly between the adjacent first mounting portions 62a and between the first mounting portions 62a and 62 and the second mounting portion 62b, And serves to support both ends of the cell 1.

The contact preventing portions 64 extend from the upper side and the lower side of the mounting frame 60 to the outside of the mounting frame 60 and are connected to the adjacent unit battery cells 1 The first lead plate 20 and the second lead plate 30 contact each other to prevent a short circuit from occurring.

Here, the contact prevention part 64 formed on one side of the lower part of the mounting frame 60 serves to prevent a short circuit between neighboring unit battery cells 1 not connected through the bus bar 40, When the battery cell assembly structure 2 is assembled, the mounting frame 60 is supported so as not to fall on the floor.

The internal wiring alignment means 65 is connected to the connection bar 50 for fixing and aligning the internal wiring for withdrawing power from the battery cell assembly structure 2 of the present invention and includes a fixing clip 65a, (65b).

The fixing clip 65a is formed on one side of the mounting frame 60 and is spaced apart from one side of the outer surface of the first mounting portion 62a and the second mounting portion 62b so that the first mounting portion 62a and the second mounting portion 62b And accommodates the internal wiring connected to the connection bar 50 in the spaced space to align the internal wiring.

The fixing piece 65b is vertically bent from one side of the supporting portion 63 of the mounting frame 60 to receive the internal wiring connected to the connecting bar 50 in a space separated from the supporting portion 63, It acts as a sort.

 The external wiring alignment means 66 is for fixing and aligning the external wiring for the cell balance check of the battery cell assembly structure 1 of the present invention and includes a fixing protrusion 66a.

The pair of fixing protrusions 66a are spaced apart from each other at a lower side of the mounting frame 60. The pair of fixing protrusions 66a protrude outward from the mounting frame 60 and accommodate external wiring for cell balance checking in mutually spaced spaces It serves to align external wiring.

Hereinafter, a process of assembling the unit battery cell assembly structure 2 according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG.

The bus bar 40 is first placed on each first mounting portion 62a of the mounting frame 60 and then the fastening bolt 70 is fastened to the first mounting portion 62a of the mounting frame 60 through the first fastening hole 41 of the bus bar 40, And the bus bar 40 is coupled to the first mounting portion 62a in order by fastening to the first insert nut 62aa of the first mounting portion 62a.

After the connecting bar 50 is disposed on the second mounting portion 62b, the fastening bolt 70 is inserted into the third insert hole 62b of the second mounting portion 62b through the third fastening hole 51 of the connecting bar 50 Nut 62ba to connect the connection bar 50 to the second mounting portion 62b in order.

Next, the mounting frame 60 to which the bus bars 40 and the connecting bars 50 are coupled is disposed apart from each other in the area to be assembled, the unit battery cell 1 is seated in the seating groove 61, The fastening bolts 70 are fastened to the first fastening holes 23 and the second fastening holes 33 formed in the first connection tab 22 and the second connection tab 32 of the unit battery cell 1 and the bus bars 40 Through the second fastening hole 42 of the first mounting portion 62a and the second insert nut 62ab of the first mounting portion 62a to couple the unit battery cell 1 to the mounting frame 60 in order.

Finally, the fastening bolts 70 are inserted into the first fastening holes 23 formed in the first connection tab 22 and the second connection tab 32 of the unit battery cell 1 disposed at both ends, And the fourth insert nut 62bb of the second mounting portion 62b through the fourth fastening hole 52 of the second connecting portion 33 and the connecting bar 50 to complete the assembly.

When the unit battery cells 1 are fastened to the mounting frame 60 through the fastening bolts 70 and thus the unit battery cells 1 need to be replaced, So as to provide a structure that can be easily replaced.

Although the present invention has been described in connection with the preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. It is, therefore, to be understood that the appended claims will include all such modifications and changes as fall within the true spirit of the invention.

1: unit battery cell 2: battery cell assembly structure
10: Battery cell 11: Positive electrode
12: negative electrode 20: first lead plate
21: first connection tab 22: first connection tab
23: first fastening hole 30: second lead plate
31: second connection tab 32: second connection tab
33: second fastening hole 40: bus bar
41: first fastening hole 42: second fastening hole
43: Fixing hole 50: Connection bar
51: third fastening hole 52: fourth fastening hole
60: mounting frame 61: seat groove
62: mounting portion 62a: first mounting portion
62aa: first insert nut 62ab: second insert nut
62ac: fixed projected portion 62b: second mounting portion
62ba: third insert nut 62bb: fourth insert nut
63: Support part 64:
65: internal wiring alignment means 65a: fixing clip
65b: Fixing piece 66: External wiring alignment means
66a: Fixing projection 70: Clamping bolt

Claims (8)

delete delete A battery pack comprising: a pair of battery cells each having a positive electrode and a negative electrode formed thereon and arranged so that the same electrodes are adjacent to each other; a first connection tab electrically connecting the two electrodes of the pair of battery cells, And a second connection tab electrically connecting the negative electrodes of the pair of battery cells at both ends and a second connection tab electrically connecting the negative electrodes of the pair of battery cells, A plurality of unit battery cells including a second lead plate including a second connection tab to be formed, the first lead plate being disposed adjacent to and in parallel with the second lead plate;
One of the unit battery cells is coupled to a first connection tab of one of the plurality of unit battery cells and the other of the unit battery cells is coupled to a second connection tab of another unit battery cell, A connecting bus bar;
And a mounting frame in which a mounting groove is formed in which a pair of the unit battery cells are spaced apart from each other and in which opposite ends of the plurality of unit battery cells are seated, ,
A pair of fixing holes are formed on one side of the bus bar, a pair of fixing protrusions are formed on one side of the mounting portion corresponding to the fixing holes, and the pair of fixing protrusions are inserted into the pair of fixing holes And the flow of the bus bar is prevented. The method of claim 3,
Wherein the first lead plate and the second lead plate are detachably coupled to the mounting portion through the bus bar. The method of claim 3,
The mounting frame
Further comprising a contact preventing portion for preventing contact between the first and second lead plates not connected through the bus bar. The method of claim 3,
The mounting frame
Further comprising a support portion formed to be recessed inward between the mounting portion and the mounting portion adjacent to the mounting portion to support both ends of the plurality of unit battery cells. The method according to claim 6,
At least one fixing clip extending from one side of the mounting frame and spaced apart from an outer surface of the mounting portion;
And an internal wiring alignment means including at least one fixing piece extending from one side of the outer surface of the support portion. 8. The method of claim 7,
Further comprising external wiring alignment means formed to be spaced apart from each other and including at least one pair of fixing protrusions protruding outwardly from one side of the mounting frame.

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