KR20180133142A - Cylindrical battery pack with shock-absorbing structure - Google Patents

Abstract

The present invention relates to a structure of a cylindrical battery pack and, more specifically to a cylindrical battery pack with a shock-absorbing structure capable of reducing the amount of shock transmitted to a nickel plate by a shock absorbing member when external shock is applied to a case by assembling a shock absorbing member between a nickel plate connected to an upper portion of a cylindrical cell and a case. The cylindrical battery pack comprises: a nickel plate; a case; and a shock absorbing unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cylindrical battery pack having a shock-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical battery pack, and more particularly, to a cylindrical battery pack having a shock-absorbing structure designed to reduce an amount of impact transmitted to a nickel plate of a cylindrical battery pack.

Lithium-ion batteries can be divided into cylindrical, square, and polymer depending on the type. Here, the cylindrical battery is a battery formed in a cylindrical shape, and has a high capacity and a high output characteristic. Therefore, cylindrical batteries are mainly used in products and fields that require a lot of power. For example, it can be applied to electric tools, electric vehicles, electric bicycles, etc., which require a momentary great force.

A cylindrical battery pack generally assembles a casing having openings corresponding to each cell on top of the plurality of cylindrical cells to form a plurality of cylindrical cells into one cylindrical cell assembly. After assembling the case, a nickel plate is connected to an upper portion of the cylindrical cell to electrically connect the plurality of cylindrical cells, and a portion except for the nickel plate connected to the upper portion of the cylindrical cell is connected between adjacent cells, A pack is formed.

However, in such a method, a separate protection structure for protecting the cylindrical battery pack from external impact is not designed. That is, when an external impact is applied to the cylindrical battery pack, the amount of impact received by the case is transmitted to the nickel plate. Therefore, a shape change occurs in the nickel plate to which the external impact is transmitted, and a change in the electrical and physical characteristics of the nickel plate may occur due to the shape change. This situation causes a performance problem of the battery pack.

In addition, the case serves to fix the cylindrical cells to one cell assembly, but does not protect the nickel plate exposed to the outside. Therefore, the nickel plate exposed to the outside can not exclude not only the impact transmitted from the case but also the possibility of damages caused by a direct impact.

As described above, the present invention intends to protect the nickel plate from external impact applied to the cylindrical battery pack.

A cylindrical battery pack comprising at least one cylindrical cell comprises: a nickel plate in contact with each cell of the cylindrical cell assembly; A case having openings formed at predetermined intervals and coupled to an upper portion of the cylindrical cell assembly; An impact absorbing portion assembled between each of the cells of the cylindrical cell assembly and the case; And,

The nickel plate includes: a cell connection portion (122) connecting to each cell of the cylindrical cell assembly; And a cell connection part extending from the cell connection part and connecting the cell connection parts; Is formed.

The shock absorbing portion is an aggregate of shock absorbing members 131 each having a circular ring shape corresponding to each cell.

The inner diameter of the shock absorbing member is formed to be smaller than the diameter of the cylindrical cell.

The outer diameter of the shock absorbing member is formed larger than the diameter of the cylindrical cell.

Here, the shock absorbing portion is an aggregate of individual shock absorbing members 131 having a shape corresponding to each of the cell connecting portions 122.

And the openings formed in the case are formed to correspond to the respective cells of the cylindrical cell assembly.

A diameter L 1 of a face F facing the cylindrical cell of the opening is not smaller than a diameter L 2 of the opposite face of the opening, and an assembly step 1422, in which an impact- Is formed.

The diameter L1 of the surface F and the diameter L2 of the opposite surface are not different from each other when facing the cylindrical cell of the opening portion and the inner middle portion of the opening portion is provided with a member engaging portion (1423) are formed.

And an engaging groove 144 to which a cell connecting portion formed on the nickel plate is coupled is formed on the side of the opening.

The nickel plate is characterized in that a voltage output tap is formed at an end of the nickel plate so as to output a sum voltage of cells connected through the cell connection portion and the cell connection portion.

The nickel plate is characterized in that a cell connecting portion that is in contact with each cell of the cylindrical cell assembly and a cell connecting portion that connects the cell connecting portions are in a separate form,

The cell connection part is in contact with adjacent cell connection parts to electrically connect the cell connection parts.

A method of forming a cylindrical battery pack includes the steps of: forming a cell connection portion in a nickel plate in contact with each cell of a cylindrical cell assembly, and forming a cell connection portion connecting the cell connection portions; A case having a case coupled to an upper portion of the cylindrical cell assembly; An impact absorbing member assembling step of assembling an impact absorbing member to each of the openings formed in the case; A case engaging step of engaging the case in which the shock absorbing member is assembled to the upper part of the cylindrical cell assembly; .

The cell connection step forms a cell connection part to correspond to a connection type of cells to be connected.

The cell connection step may include forming a cell connection part on the nickel plate, and then connecting the cell connection part for connection to form a cell connection part.

The present invention can mitigate the impact transmitted to the nickel plate by absorbing an impact externally applied by the shock-absorbing structure by adding a shock-absorbing structure between the nickel plate and the case. In addition, the nickel plate can be protected from the outside by preventing the case from being exposed to the outside.

1 is a view showing a configuration of a cylindrical battery pack according to the present invention;
Fig. 2 is a cross-sectional view of the cell connecting portion according to Embodiment 1
Fig. 3 is a cross-sectional view of the cell connecting portion according to Embodiment 2
4 is a view showing an impact absorbing member
5 is a view showing a case where the case and the shock absorbing member are assembled
(a) Example 1 of forming a coupling groove
(b) Example 2 of forming a coupling groove
6 is a sectional view showing Embodiment 1 of the impact absorbing member assembly
7 is a cross-sectional view showing Embodiment 2 of the impact absorbing member assembly
8 is a sectional view showing Embodiment 3 of the impact absorbing member assembly
9 is a block diagram of a method of assembling a cylindrical battery pack according to the present invention
10 is a view showing the entirety of a cylindrical battery pack according to the present invention.
11 is a view showing another embodiment in the form of an impact absorbing member

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as " comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise. The word " step (or step) " or " step " used to the extent that it is used throughout the specification does not mean " step for.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

A cylindrical battery pack comprising at least one cylindrical cell according to the present invention comprises:

A nickel plate in contact with each cell of the cylindrical cell assembly;

A case having openings formed at predetermined intervals and coupled to an upper portion of the cylindrical cell assembly;

An impact absorbing portion assembled between each of the cells of the cylindrical cell assembly and the case; And,

The nickel plate includes: a cell connection portion that contacts each cell of the cylindrical cell assembly; And a cell connection part extending from the cell connection part to connect the cell connection parts; Is formed.

1 is a view showing a state in which a cylindrical battery pack according to the present invention is disassembled.

Referring to FIG. 1, the cylindrical battery pack 100 may include a cylindrical cell 110, a nickel plate 120, a shock absorber 130, and a case 140.

Although FIG. 1 illustrates a part of the cylindrical cells 110 constituting the cylindrical battery pack 100 for convenience, the cylindrical battery pack 100 may include a plurality of cylindrical cells 110. Here, an assembly of a plurality of cylindrical cells is referred to as a cylindrical cell assembly.

The nickel plate 120 has a structure in which a cell connecting portion 122 and a cell connecting portion 124 are formed to electrically connect the cylindrical cells constituting the cylindrical cell assembly.

≪ Example of cell connection part formation >

Referring to FIG. 2, in Embodiment 1, the nickel plate 120 may be formed with a cell connection portion 122 that contacts and electrically connects to an upper portion of each cell of the cylindrical cell assembly. The cell connection part 124 may be formed by connecting a part extending from the cell connection part 122. The portion extending from the cell connection portion 122 may be formed on one side of each cell connection portion according to the connection structure of the cell. 2 illustrates a state in which two cylindrical cells are electrically connected through the cell connection part 122 and the cell connection part 124. However, the present invention is not limited thereto and may connect two or more cells in some cases.

Referring to FIG. 3, the cell connection part 122 and the cell connection part 124 may be separated from each other. The cell connection portion 122 is formed on each of the cylindrical cells. Here, the cell connection part 124 is not formed by connecting a part extending to one side of the cell connection part 122, but a cell connection part 124 separate from the cell connection part 122 is formed. Therefore, after the cell connecting portion is formed, an electrical connection can be made between the cell connecting portions by being placed between the cell connecting portions to be connected. As shown in FIG. 3, one side of the cell connection 124 should be placed in contact with one cell connection, and the opposite side of the cell connection 124 should be placed in contact with another cell connection. As described above, the cell connecting portion 124 placed between the cell connecting portions can be stably connected electrically to the cell connecting portions by the pressure of the case assembled with the shock absorbing portion coupled to the upper portion of the cylindrical cell assembly to be described later.

10, a voltage output tap may be formed at an end of the nickel plate 120 to output a sum voltage of cells connected through the cell connection part 122 and the cell connection part 124 .

As described above, in the first or second embodiment, the cylindrical cells constituting the cylindrical cell assembly can be electrically connected through the cell connection part 122 and the cell connection part 124.

The shock absorbing portion 130 can be described as an aggregate of shock absorbing members 131 having a circular ring shape corresponding to each cell constituting the cylindrical cell assembly.

The shock absorbing member 131 is configured to be assembled to each corresponding opening 142 of a cylindrical cell formed in a case to be described later. The structure in which the shock absorbing member 131 is assembled will be described later in more detail.

The shock absorbing member 131 should be formed in consideration of the diameter of the cylindrical cell since it must be assembled in the opening 142 formed to correspond to the cylindrical cell.

4, the outer diameter of the outer diameter of the shock absorbing member 131 having the circular ring shape may be larger than the diameter of the cylindrical cell. The inner diameter, which is the inner diameter of the shock absorbing member 131, may be smaller than the diameter of the cylindrical cell.

For example, if the diameter of the cylindrical cell is 18 mm, the impact absorbing member can be designed considering the diameter of the cylindrical cell + -1 mm. That is, the outer diameter of the shock absorbing member may be designed to be 19 mm, and the inner diameter thereof may be designed to be 17 mm.

The shock absorbing member 131 is disposed between the case and the nickel plate formed with the cell connecting portion 122 and the cell connecting portion 124 when the case is coupled to the upper portion of the cylindrical cell assembly, Since the nickel plate is to be protected, it should be made of material that can absorb shock.

For example, it may be composed of polyvinyl chloride (PVC), but not limited thereto, and may be constituted of a material capable of shock absorption other than polyvinyl chloride.

In addition, the shock absorbing member 131 may have a shape other than the circular O-ring shape according to the shape of the cell connection part 122 of the nickel plate 120.

For example, as shown in FIG. 11, each battery cell may be a square cell 210, not a cylindrical cell, and the cell connection 222 formed on the cell surface may have a square shape corresponding to the square cell . In this case, the shock absorbing member 231 may be in a rectangular shape corresponding to the rectangular cell connection portion 222 for stably protecting the nickel plate 220.

That is, since the impact absorption member 131 is coupled to each cell to protect the nickel plate 120 from external impacts, the nickel plate 120, more precisely, corresponds to the shape of the cell connection part 122 As shown in FIG.

The opening 142 formed in the case 140 accommodates the impact absorbing member 131 and may correspond to the shape of the cell connection portion 122 of the nickel plate 120 .

The case 140 is coupled to the upper portion of the cylindrical cell assembly to fix the respective cylindrical cells to one cylindrical cell assembly and to protect from the outside.

As shown in FIG. 1, openings 142 are formed in the case 140 at predetermined intervals, and the openings 142 may correspond to respective cells of the cylindrical cell assembly.

≪ Example 1 >

In Embodiment 1, the diameter of the opening 142 of the surface F on which the case 140 is assembled facing the cylindrical cell may be formed so as not to be smaller than the diameter of the opening on the opposite surface. A step due to the difference in diameter of the openings along the front and back surfaces of the case may be formed. This is referred to as an assembling step 1422, and the assembling step 1422 allows the impact absorbing member 131 to be engaged and fixed without coming off the opposite surface.

6, the case 140 is formed such that the diameter L1 of the opening on the face F facing the cylindrical cell is larger than the diameter L2 of the opening on the opposite face of the case 140 . Therefore, a step due to the difference between L1 and L2 is formed.

The L1 may be formed to have the same size as the outer diameter of the impact absorbing member 131 because the impact absorbing member 131 is to be fitted and assembled. For example, if the outer diameter of the impact absorbing member 131 is 19 mm, the diameter L1 of the opening on the face F facing the cylindrical cell should be 19 mm. Further, if the opening on the face F facing the cylindrical cell is formed to have a diameter of 19 mm, the diameter L2 of the opening formed on the opposite face should be smaller than 19 mm.

The height t1 of the opening formed by the diameter of L1, that is, the height at which the impact absorbing member 131 is assembled / inserted, may be formed to be shorter than the thickness T of the impact absorbing member. 6, when the impact absorbing member 131 is assembled, the impact absorbing member 131 is assembled higher than the F side of the case, so that the nickel plate located on the upper portion of the cylindrical cell can be more stably protected from the external impact It is.

≪ Example 2 >

In Embodiment 2, the member engaging portion 1423 can be formed on the inner sidewall of the opening 142 without leaving a difference in diameter between the opening F facing the cylindrical cell and the opposite surface.

7, the opening 142 formed in the case 140 is formed to have the same diameter as the face F opposite to the cylindrical cell, and is protruded from the inner side wall of the opening 142 A member locking portion 1423 can be formed. Therefore, when the impact absorbing member 131 is inserted into the opening as shown in FIG. 7, the member is not caught by the opposite surface but is engaged and fixed by the member engaging portion 1423.

Here, when the member preventing stones 1423 are formed, they may be formed at the position t2 having a length shorter than the thickness T of the impact absorbing member 131. [ Therefore, when the impact absorbing member 131 is engaged / fixed to the member engaging portion 1423, the impact absorbing member 131 is positioned higher than the F side, so that the nickel plate positioned on the upper portion of the cylindrical cell is more stable .

≪ Example 3 >

In Embodiment 3, the case 140 may be formed such that the diameter of the opening 142 on the face F facing the cylindrical cell becomes smaller toward the opposite side. That is, as shown in FIG. 8, the width of the opening may become narrower toward the opposite side on the surface F opposite to the cylindrical cell. Therefore, when the shock absorbing member 131 is inserted into the opening on the F side, it can be engaged and fixed without coming out to the opposite side.

Here, when the width of the opening is narrowed, the thickness of the impact absorbing member 131 should be considered together with the thickness T of the impact absorbing member so that the impact absorbing member can be formed higher than the F-face.

≪ Example of formation of coupling groove &

5, a coupling groove 144 is formed on the side of the opening 142, to which a cell connecting portion 124 formed on the nickel plate is coupled when the case is coupled to the upper portion of the cylindrical cell assembly, as shown in FIG. . However, the present invention is not limited thereto, and coupling grooves 144 may be formed on one side or at least one side of each opening 142 according to the connection structure of the cylindrical cells.

In another embodiment, the coupling groove 144 may be formed in the opening 142 in the up, down, left, and right directions as shown in (b). Accordingly, in this case, the coupling grooves 144 are formed in the case according to the connection structure of the cylindrical cells, but the coupling structure of the cylindrical cells is coupled to the coupling grooves 144.

The dimensions such as the length and width of the coupling groove may be formed to correspond to the cell connecting portion 124. Thus, the upper part of the cylindrical cell assembly and the case can be stably engaged. 5 (a) and 5 (b) show a part of the entire case for the sake of convenience.

With such a structure, the shock absorbing member 131 can be stably fitted between the case 140 and the nickel plate located above the cylindrical cell, and when the case is coupled to the upper part of the cylindrical cell assembly, Can be coupled to each opening. Therefore, when the impact is applied to the case from the outside, the impact absorbing member 131 assembled between the nickel plate and the case absorbs the shock, so that the external impact can be prevented from being transmitted to the nickel plate electrically connecting the cylindrical cells. have. This can prevent a change in the electrical and physical properties of the nickel plate from occurring due to an external impact.

9 is a block diagram showing a method of assembling the cylindrical battery pack of the present invention.

Referring to FIG. 9, a cell connecting step S100, a case providing step S200, an impact absorbing member assembling step S300, and a case combining step S400 may be included.

The cell connection step S100 is a step of forming a cell connection portion in the nickel plate that contacts each cell of the cylindrical cell assembly, and forming a cell connection portion connecting the cell connection portions.

First, a cell connecting portion 122 contacting the nickel plate may be formed on each of the cells constituting the cylindrical cell assembly. The cell connection portion 122 is a portion where the cell and the nickel plate are electrically connected.

In an embodiment, the cell connection part 124 may be formed by connecting a part extending from the cell connection part 122. The portion extending from the cell connection portion 122 may be formed on one side of each cell connection portion according to the connection structure of the cell. For example, referring to FIG. 2, one side of each cell connection 122 forms an extension of the cell connection and connects the extension between the desired cell connections to form a cell connection 124 .

In another embodiment, after the cell connection part 122 is formed, a separate cell connection part 124 may be electrically connected between the cell connection parts for connection. For example, referring to FIG. 3, after forming the cell connection portions 122 corresponding to the respective cylindrical cells, a separate cell connection portion 124 may be placed between the cell connection portions 122 for connection. Here, one side of the cell connection part 124 should be placed so as to be connected to one cell connection part, and the opposite side of the cell connection part 124 should be connected to another cell connection part to be connected. After attaching the cell connection part 124 between the cell connection parts to be connected as described above, the case assembled with the shock absorption part can be coupled to the upper part of the cylindrical cell assembly through the case combining step S400 to be described later. Therefore, the electrical connection between the cell connections can be made by the pressure of the case in which the shock absorber is assembled.

The cylindrical cells can be electrically connected through the cell connection part 122 and the cell connection part 124 formed as described above.

The case providing step S200 may include a case for fixing and protecting each cell of the cylindrical cell assembly, and may include an opening forming step S210 and an engaging groove forming step S220.

The opening forming step S210 may form an opening corresponding to each cell of the cylindrical cell assembly.

In one embodiment, the diameter of the opening of the face F to be assembled facing the cylindrical cell may be larger than the diameter of the opening of the opposite face. That is, the step 1422 may be formed on the inner side wall due to the difference in diameter between the opening on the F side and the opening on the opposite side.

Here, since the shock absorbing member must be assembled to the opening on the F side, the opening can be formed in consideration of the outer diameter of the shock absorbing member. For example, the diameter of the opening on the F side is not smaller than the outer diameter of the shock absorbing member so that the shock absorbing member is fitted or loosely inserted into the opening on the F side, and the stepped portion 1422 exits to the opposite side (See Figs. 6 and 8)

In another embodiment, the member-engaging portion 1423, in which the shock-absorbing member is engaged and fixed to the side wall of the opening portion, without making a difference in the diameter of the opening portion of the opposite surface and the opening portion of the surface F to be assembled facing the cylindrical- . Therefore, when the impact absorbing member is inserted / assembled into the opening portion by the member engaging portion 1423, it can be engaged and fixed without coming out to the opposite surface. (See Fig. 7)

Also in this case, the diameter of the opening may be such that the external alarm of the shock absorbing member is not so small.

The joining groove forming step S220 may be a step of forming a groove to which the cell connecting portion 124 connecting the cell connecting portions when joining the case to the upper portion of the cylindrical cell assembly is coupled.

In one embodiment, the coupling groove 144 may be formed on one side of each opening to correspond to the cell connection 124 formed along the connection structure, taking into account the connection structure of the cylindrical cells, or may be formed on one or more sides You may. (See Fig. 5 (a)).

In another embodiment, the coupling grooves 144 may be formed in all the directions of the upper, lower, left, and right sides of the respective openings 142 without considering the connection structure of the cylindrical cells. In such a case, the case is not only possible to have only one connecting structure, but also cylindrical cells having any connecting structure can be fittable. (See Fig. 5 (b)).

The step of assembling the shock absorbing member (S300) may be a step of assembling the shock absorbing member to each opening of the case provided through the case mounting step (S200).

In the opening forming step S210, the opening is formed to fix the impact absorbing member 131 so that the impact absorbing member 131 can be stably fixed to each opening.

The case coupling step S400 is a step of coupling the case in which the shock absorber 131 is assembled to the upper portion of the cylindrical cell assembly through each shock absorber assembling step S300. The respective openings in which the shock absorbing members 131 are assembled can be combined to correspond to the respective cells of the cylindrical cell assembly and the joints and the cell connection portions (cylindrical cell connection structures) formed on the upper portions of the cylindrical cell assemblies correspond to each other . Therefore, the cylindrical cells can be stably assembled as shown in FIG.

When the impact absorbing member assembled / inserted into each of the openings is fitted between the case and the nickel plate on the upper part of the cylindrical cell, when an impact is applied to the case from outside, the impact absorbing member 131 absorbs the impact, Can be prevented from being transmitted to the nickel plate 200 that electrically connects the cylindrical cells. This can prevent a change in the electrical and physical properties of the nickel plate from occurring due to an external impact.

110: Cylindrical battery cell
120: Nickel plate
122: cell connection
124: cell connection
131: shock absorber
140: Case
142: opening
144: Coupling groove

Claims (14)

A cylindrical battery pack comprising at least one cylindrical cell,
A nickel plate in contact with each cell of the cylindrical cell assembly;
A case having openings formed at predetermined intervals and coupled to an upper portion of the cylindrical cell assembly;
An impact absorbing portion assembled between each of the cells of the cylindrical cell assembly and the case;
And,
The nickel plate includes: a cell connection portion (122) connecting to each cell of the cylindrical cell assembly; And a cell connection part extending from the cell connection part and connecting the cell connection parts; Is formed.
The method according to claim 1,
Wherein the shock absorbing portion comprises:
Is an aggregate of shock absorbing members (131) each having a circular ring shape corresponding to each cell.

The method of claim 2,
The inner diameter of the shock-
And the diameter of the cylindrical cell is smaller than the diameter of the cylindrical cell.
The method of claim 2,
The outer diameter of the shock-
Wherein a diameter of the cylindrical cell is larger than a diameter of the cylindrical cell.
The method according to claim 1,
The openings formed in the case,
And is formed to correspond to each cell of the cylindrical cell assembly.
The method of claim 5,
The diameter L1 of the face F facing the cylindrical cell of the opening is not less than the diameter L2 of the opposite face,
And an assembly step (1422) for assembling the shock absorbing member is formed on an inner sidewall of the opening.
The method of claim 5,
The diameter (L1) of the surface (F) and the diameter (L2) of the opposite surface are formed so as not to differ from each other when facing the cylindrical cell of the opening,
In the inner central portion of the opening,
And a member engaging portion (1423) to which the shock absorbing member is fixed.
The method of claim 5,
On the side of the opening,
And a coupling groove (144) to which a cell connection portion formed on the nickel plate is coupled.
The method according to claim 1,
Wherein the nickel plate has a voltage output tap formed at an end thereof to output a sum voltage of cells connected through the cell connection portion and the cell connection portion.
The method according to claim 1,
Wherein the nickel plate
The cell connecting portion contacting each cell of the cylindrical cell assembly and the cell connecting portion connecting the cell connecting portions are in a separate form,

Wherein the cell connection portion contacts the adjacent cell connection portions to electrically connect the cell connection portions.
The method of claim 2,
Wherein the shock absorbing portion comprises:
Is a collection of individual shock absorbing members (131) having a shape corresponding to each of the cell connection portions (122).
In the method of forming the cylindrical battery pack,
Forming a cell connection in a nickel plate in contact with each cell of the cylindrical cell assembly and forming a cell connection connecting the cell connections;
A case having a case coupled to an upper portion of the cylindrical cell assembly;
An impact absorbing member assembling step of assembling an impact absorbing member to each of the openings formed in the case;
A case engaging step of engaging the case in which the shock absorbing member is assembled to the upper part of the cylindrical cell assembly;
And forming a battery pack.
The method of claim 12,
The cell connection step includes:
Wherein the cell connection portion is formed to correspond to a connection shape of cells to be connected.
The method of claim 12,
The cell connection step includes:
Wherein the cells are connected to each other using a cell connection portion provided between the cell connection portions for connection after the cell connection portion is formed on the nickel plate.

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