Battery module

Abstract

To provide a battery module having a step difference between a holder and a battery cell, in which an insulating tape is attached to a tab member for insulation even when the tab member is bent.SOLUTION: This battery module includes a plurality of battery cells, a holder that accommodates the battery cells, a tab member that is installed in the holder and is welded to an electrode terminal of the battery cell, and an insulating tape that insulates the tab member. The tab member includes a main body part disposed on the holder, a neck part that is bent downward from the main body part and is disposed inside the holder, and a tab part that is bent from the neck part and is connected to the electrode terminal. The insulating tape includes a main body attachment part to be attached to the main body part, and a tab attachment part to be separated from the main body attachment part by a cutting line and attached to the tab part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a battery module, and more particularly to a battery module in which tab members that connect battery cells are insulated with insulating tape. [Background technology]

[0002] A rechargeable battery is a battery that, unlike a primary battery, can be repeatedly charged and discharged. Small-capacity secondary batteries are used in small, portable electronic devices such as mobile phones, laptops, and camcorders. Large-capacity, high-density secondary batteries are used as power sources for driving motors in hybrid and electric vehicles, and for energy storage.

[0003] The secondary battery can be used as a battery module including a plurality of battery cells connected in series and / or parallel to drive a motor of a hybrid vehicle, which requires a relatively high energy density. For example, to realize a relatively high-output battery module (e.g., an electric vehicle), a battery module is formed by connecting together electrode terminals of a plurality of battery cells, the number of which corresponds to the desired amount of power.

[0004] For example, a battery module is formed by housing a plurality of battery cells in a holder and connecting them in series and / or parallel with tabs. The battery module includes tabs for connecting the battery cells and a battery management system connected to the tabs because the voltage and current required by consumers are high.

[0005] In this case, insulating tape is used to insulate the tab. Since the insulating tape is integrally formed, there is a step between the holder and the battery cell, and therefore when the tab is bent, it is attached to the upper side of the holder and the tab, and therefore it is not possible to directly insulate the welded portion between the electrode terminal and the tab. In other words, the welded portion between the electrode terminal and the tab forms a space separated from the insulating tape, and the portion exposed to this empty space is vulnerable to galvanic corrosion. Summary of the Invention [Problem to be solved by the invention]

[0006] One embodiment of the present invention provides a battery module in which insulating tape is attached to a tab member to insulate it even if a step is present between a holder and a battery cell and the tab member is bent. [Means for solving the problem]

[0007] A battery module according to one embodiment of the present invention includes a plurality of battery cells, a holder for accommodating the battery cells, a tab member installed on the holder and welded to an electrode terminal of the battery cell, and an insulating tape for insulating the tab member, wherein the tab member includes a body portion disposed on the holder, a neck portion bent downward from the body portion and disposed inside the holder, and a tab portion bent from the neck portion and connected to the electrode terminal, and the insulating tape includes a body attachment portion attached to the body portion, and a tab attachment portion separated from the body attachment portion by a cutting line and attached to the tab portion.

[0008] The insulating tape may include a connection portion that connects the body attachment portion and the tab attachment portion to each other and is separated from each other during the attachment process.

[0009] The battery cell is a cylindrical battery, and the holder can accommodate the battery cell and form circular openings that are open to correspond to both ends of the battery cell in the axial direction.

[0010] The body attachment portion and the tab attachment portion may include a straight boundary line formed along the boundary between the body portion and the neck portion, and a curved boundary line formed along the circular opening of the holder and connecting to the straight boundary line.

[0011] The connection portion may be formed on a curved boundary line, connecting the body attachment portion and the tab attachment portion to each other and separating from each other upon attachment, and the remaining portion of the curved boundary line and the straight boundary line may complete the cutting line.

[0012] The connection portions may be provided at both diametrical ends of the opening of the holder at positions parallel to the straight boundary line.

[0013] The connection portion is formed on the straight boundary line and the curved boundary, one by one, to connect the body attachment portion and the tab attachment portion to each other and separate from each other when attached, and another part of the curved boundary line and another part of the straight boundary line can complete the cutting line.

[0014] The connection portions may be provided at the center of a straight boundary line and at the center of a curved boundary line corresponding to both diametric ends of the opening of the holder, respectively.

[0015] A battery module according to one embodiment of the present invention includes a plurality of battery cells, a holder that accommodates the battery cells, a tab member that is installed on the holder and welded to an electrode terminal of the battery cell, and an insulating tape that insulates the tab member, wherein the tab member includes a body portion that is arranged on the holder, a neck portion that is bent downward from the body portion and arranged inside the holder, and a tab portion that is bent from the neck portion and connects to the electrode terminal, and the insulating tape includes a body attachment portion attached to the body portion, a neck attachment portion that connects to the body attachment portion and is attached to the neck portion, and a tab attachment portion that is separated from the body attachment portion along a cutting line, connects to the neck attachment portion, and is attached to the tab portion.

[0016] The body attachment portion and the neck attachment portion define a straight boundary line along the boundary between the body portion and the neck portion, and the neck attachment portion and the tab attachment portion define a curved boundary line along the circular opening of the holder and are connected to the straight boundary line. The neck attachment portion and the tab attachment portion are defined in a portion adjacent to the body attachment portion, and the portion attached to the neck portion defines the neck attachment portion, and the other portion excluding the neck attachment portion defines the tab attachment portion.

[0017] The neck attachment may connect to the body attachment with a straight boundary line, and a curved boundary line may form the cut line.

[0018] The width of the neck attachment portion may be formed to be less than 1 / 2 the diameter of the holder opening.

[0019] The neck attachment portion is formed on a straight boundary line, connects the body attachment portion and the tab attachment portion to each other, and includes a pair of connecting neck portions provided on both ends of the straight boundary line, and at least one partial cut line formed in the direction of the straight boundary line to partially connect and partially separate the pair of connecting neck portions, and the curved boundary line can form the cut line.

[0020] The partial cutting line may be formed as one or a plurality of separate lines along the direction of the straight boundary line. Effect of the Invention

[0021] In one embodiment of the battery module, even if there is a step between the holder and the battery cell and the tab member is bent, insulating tape can be attached to the main body portion and tab portion (e.g., the first tab portion and the second tab portion) that are connected to the neck portion (e.g., the first neck portion and the second neck portion) by the tab member, thereby insulating the main body portion and tab portion of the tab member.

[0022] Therefore, corrosion of the tab portion welded to the electrode terminal, i.e., galvanic corrosion, can be prevented. In this way, since there is no space between the insulating tape and the tab portion, the insulating tape can be saved.

[0023] In addition, since the insulating tape is provided at the body attachment portion and the tab attachment portion, in the process of attaching the body attachment portion to the body portion, the tab attachment portion is separated from the body attachment portion and attached to the tab portion, thereby improving the workability of attaching the insulating tape. [Brief description of the drawings]

[0024] [Figure 1] 1 is an exploded perspective view of a battery module according to a first embodiment of the present invention; [Diagram 2] 2 is a perspective view of the assembled battery module of FIG. 1 as viewed from above. FIG. [Diagram 3] FIG. 3 is a perspective view of the battery module of FIG. 2 when turned over. [Figure 4] FIG. 2 is a perspective view of the tab member of FIG. [Diagram 5] 2 is a perspective view of the battery module of FIG. 1 with insulating tape attached to a welded portion between an electrode terminal and a tab member. FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] 2 is a plan view of the battery module of FIG. 1 in a state before insulating tape is attached to the welded portion between the electrode terminal and the tab member. FIG. [Figure 8] 13 is a plan view of a battery module according to a second embodiment of the present invention, showing a state before insulating tape is attached to a welded portion between an electrode terminal and a tab member. FIG. [Figure 9] 13 is a perspective view of a battery module according to a third embodiment of the present invention, showing a state in which insulating tape is attached to a welded portion between an electrode terminal and a tab member. FIG. [Figure 10] 10 is a plan view of the battery module of FIG. 9 in a state before insulating tape is attached to the welded portion between the electrode terminal and the tab member. FIG. [Figure 11] 13 is a plan view of a battery module according to a fourth embodiment of the present invention, showing a state before insulating tape is attached to a welded portion between an electrode terminal and a tab member. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention can be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unnecessary for the explanation are omitted, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0026] FIG. 1 is an exploded perspective view of a battery module according to a first embodiment of the present invention, FIG. 2 is a perspective view of the assembled battery module of FIG. 1 as viewed from above, and FIG. 3 is a perspective view of the battery module of FIG. 2 as viewed upside down.

[0027] 1 to 3, a battery module 1 of the first embodiment includes a plurality of battery cells 10, a holder 20 that houses the battery cells 10, tab members 50 that are welded to electrode terminals 40 of the battery cells 10, and an insulating tape 60 that electrically insulates the tab members 50.

[0028] The multiple battery cells 10 are cylindrical batteries, and are provided with electrode terminals 40 at both ends of the cylindrical battery in the axial direction. That is, the electrode terminals 40 include a positive terminal 41 and a negative terminal 42 provided at both ends of each battery cell 10 in the axial direction.

[0029] The holder 20 includes a bottom holder 21 and a tab holder 22. The bottom holder 21 and the tab holder 22 form a honeycomb structure therein to accommodate a plurality of battery cells 10 spaced apart in a first direction (x-axis direction) and a second direction (y-axis direction) intersecting the first direction, and are coupled to each other in a third direction (z-axis direction) intersecting the second direction and firmly fastened by fastening members 23.

[0030] 1, the bottom holder 21 accommodates the lower side of the battery cell 10, and the tab holder 22 accommodates the upper side of the battery cell 10. In this state, the bottom holder 21 and the tab holder 22 are fastened together by fastening members 23.

[0031] In addition, the bottom holder 21 and the tab holder 22 can be further connected by a snap fit structure of a connecting portion 24 provided on the outside of the bottom holder 21 and a protrusion 25 provided on the outside of the tab holder 22 corresponding to the connecting portion 24.

[0032] A plurality of battery cells 10 are housed in a holder 20 and arranged in a first row (R1) and a second row (R2) that are parallel to each other. The first row (R1) and the second row (R2) are set in a second direction, spaced apart from each other in the first direction, and repeatedly arranged.

[0033] As an example, in the first row (R1), the negative electrode terminal 42 is disposed on the upper side, and the positive electrode terminal 41 is disposed on the lower side. In addition, in the second row (R2), the positive electrode terminal 41 is disposed on the upper side, and the negative electrode terminal 42 is disposed on the lower side.

[0034] The axial centers of the battery cells 10 arranged in the first row (R1) and the axial centers of the battery cells 10 arranged in the second row (R2) are shifted from each other in a direction intersecting the first row (R1) and the second row (R2). Therefore, the intervals between adjacent cylindrical battery cells 10 can be made uniform.

[0035] That is, the battery cells 10 arranged in the second column (R2) maintain a state shifted in the second direction (y-axis direction) relative to the battery cells 10 arranged in the first column (R1). Therefore, the side faces of the two battery cells 10 arranged at the ends of the first column (R1) and the second column (R2) are arranged to be shifted in the arrangement direction of the first column (R1) and the second column (R2).

[0036] The tab member 50 is disposed in the mounting grooves 221 of the bottom holder 21 and the tab holder 22, and connects the corresponding electrode terminals 40, etc. to each other. A protrusion 222 is provided on one side of the mounting groove 221, and is coupled to a coupling hole (H) corresponding to the tab member 50.

[0037] Therefore, the mounting groove 221 can set the position of the tab member 50 and stabilize the position of the tab member 50 before welding the tab member 50 to the electrode terminal 40. In addition, the protrusion 222 is coupled to the coupling hole (H) when the position setting of the tab member 50 is completed, thereby preventing the tab member 50 from being separated from the mounting groove 221.

[0038] As an example, the tab member 50 can be formed including a nickel material, electrically connects the battery cells 10 in parallel and / or series, and is electrically connected to the battery management system (BMS) 30. The tab member 50 can be formed by punching and bending a thin plate material.

[0039] As an example, the battery management system (BMS) 30 may be installed on the side of the bottom holder 21 and the tab holder 22. The tab members 50 each have an output end 54 on one side in the first direction (x-axis direction), and are electrically connected to the battery management system (BMS) 30 at the output end 54. To install the tab member 50, the bottom holder 21 and the tab holder 22 may be appropriately opened from the side.

[0040] Fig. 4 is a perspective view of the tab member of Fig. 1. Referring again to Fig. 4, the tab member 50 includes a main body portion 51, a first tab portion 521 and a second tab portion 522 of the tab portion, and a first neck portion 531 and a second neck portion 532 of the neck portion.

[0041] The tab holder 22 accommodates the battery cell 10 and has circular openings 224 that are open to correspond to both axial ends of the battery cell 10 (see FIGS. 1 and 2). The openings 224 are formed in a structure that corresponds to that of the bottom holder 21, and for convenience, a description of the bottom holder 21 will be omitted.

[0042] The connection structure of the first tab portion 521 includes an eleventh connection (C11) that is welded to the negative terminal 42 into two branches and is bent to extend in the height direction (z-axis direction), followed by a twelfth connection (C12) that extends in a direction perpendicular to the first row (R1), and then a thirteenth connection (C13) that extends in the first row (R1) direction through the first auxiliary portion 511 to connect to the main body portion 51.

[0043] The connection structure of the second tab portion 522 includes a 21st connection (C21) that is welded to the positive terminal 41 into two branches and is bent to extend in the height direction (z-axis direction), followed by a 22nd connection (C22) that extends in a direction perpendicular to the second row (R2), and then a 23rd connection (C23) that extends in the second row (R2) direction through the second auxiliary portion 512 to connect to the main body portion 51.

[0044] The connection structure of the first tab portion 521, which includes the eleventh connection (C11), the twelfth connection (C12), and the thirteenth connection (C13), and the connection structure of the second tab portion 522, which includes the twenty-first connection (C21), the twenty-second connection (C22), and the twenty-third connection (C23), are configured so that the negative and positive terminals 42, 41 are connected to the main body portion 51 over a long distance.

[0045] Therefore, the difference between the overall distance through the body portion 51 of the connection structure of the first tab portion 521 to the final output end of the tab member 50 and the overall distance through the body portion 51 of the connection structure of the second tab portion 522 to the final output end of the tab member 50 is minimized. In other words, the voltage difference between the battery cells 10 in the first row (R1) and the battery cells 10 in the second row (R2) can be minimized.

[0046] 1, 2, and 4 again, the main body portion 51 is disposed between the first row (R1) and the second row (R2) of the battery cells 10, and is connected in the second direction (y-axis direction). As a result, the main body portion 51 extending in the second direction (y-axis direction) further includes a first auxiliary portion 511 and a second auxiliary portion 512 connected in the first direction (x-axis direction).

[0047] The first tab portion 521 is connected to the negative electrode terminal 42 in the first row (R1). That is, the first tab portion 521 is connected to the main body portion 51 through the first auxiliary portion 511 and is arranged in the first row (R1). The second tab portion 522 is connected to the positive electrode terminal 41 in the second row (R2). That is, the second tab portion 522 is connected to the main body portion 51 through the second auxiliary portion 512 and is arranged in the second row (R2).

[0048] The first auxiliary part 511 includes a pair of electrically connecting first tab parts 521, and connects in parallel the negative terminals 42 of two battery cells 10 arranged in the second direction (y-axis direction). The first auxiliary part 511 avoids the two battery cells 10 arranged in the first row (R1) direction and is connected to the main body part 51 by passing between the two battery cells 10.

[0049] The first neck portion 531 is bent downward from the first auxiliary portion 511 of the main body portion 51 and disposed on a side surface inside the opening 224 through the opening 224 of the tab holder 22. The pair of first tab portions 521 are connected to the first neck portion 531, and the first neck portion 531 avoids the two battery cells 10 disposed in the first row (R1) direction. The pair of first tab portions 521 are connected to the respective negative electrode terminals 42 of the two battery cells 10.

[0050] The second auxiliary part 512 includes a pair of electrically connected second tab parts 522, and connects in parallel the positive electrode terminals 41 of two battery cells 10 arranged in the second direction (y-axis direction). The second auxiliary part 512 avoids the two battery cells 10 arranged in the second row (R2) direction and is connected to the main body part 51 by passing between the two battery cells 10.

[0051] The second neck portion 532 is bent downward from the second auxiliary portion 512 of the main body portion 51 and disposed on a side surface inside the opening 224 through the opening 224 of the tab holder 22. The pair of second tab portions 522 are connected to the second neck portion 532, and the second neck portion 532 avoids the two battery cells 10 disposed in the second row (R2) direction. The pair of second tab portions 522 are connected to the respective positive terminals 41 of the two battery cells 10.

[0052] The first tab portion 521, the first neck portion 531 and the first auxiliary portion 511 of the first row (R1) make the current paths of the two battery cells 10 located in the first row (R1) to the main body portion 51 the same. Therefore, the voltage difference between the battery cells 10 in the first row (R1) can be minimized.

[0053] The second tab portion 522, the second neck portion 532, and the second auxiliary portion 512 in the second row (R2) make the current paths of the two battery cells 10 located in the second row (R2) the same up to the main body portion 51. Therefore, the voltage difference between the battery cells 10 in the second row (R2) can be minimized.

[0054] In addition, the main body 51 is connected to the first auxiliary part 511 and the second auxiliary part 512, and connects in series the two battery cells 10 connected in parallel in the first row (R1) and the two battery cells 10 connected in parallel in the second row (R2).

[0055] Therefore, the current of the two battery cells 10 connected in parallel in the first string (R1) flows through the main body 51, and the current of the two battery cells 10 connected in parallel in the second string (R2) flows through the main body 51.

[0056] At this time, since the main body 51 of the tab member 50 is shared by the first row (R1) and the second row (R2), the voltage difference between the battery cells 10 in the first row (R1) and the second row (R2) can be minimized, and therefore the lifespan of the battery cells 10 can be prevented from being shortened.

[0057] 1 and 2 again, insulating tape 60 includes a body attachment portion 61 attached to body portion 51, and a tab attachment portion 62 attached to first and second tab portions 521, 522 of the tab portion. Body attachment portion 61 and tab attachment portion 62 are separated at a cutting line (CL) and are attached to body portion 51 and first and second tab portions 521, 522 of the tab portion, respectively.

[0058] The insulating tape 60 includes a connection portion 63 that connects the body attachment portion 61 and the tab attachment portion 62 to each other and is separated from each other during the attachment process. Since the connection portion 63 is separated during the attachment process, the body attachment portion 61 and the tab attachment portion 62 can be attached to the body portion 51 and the first and second tab portions 521 and 522, respectively.

[0059] Meanwhile, the tab holder 22 includes ribs 223 that protrude between adjacent tab members 50 in the first direction and extend in the second direction. Also, the insulating tape 60 includes cutouts 64 that correspond to the ribs 223. When the insulating tape 60 is placed on the tab members 50 before attachment, the cutouts 64 are coupled to the ribs 223, so that the insulating tape 60 can be prevented from moving.

[0060] Fig. 5 is a perspective view of a state in which insulating tape has been attached to the welded portion between the electrode terminal and the tab member in the battery module of Fig. 1, Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5, and Fig. 7 is a plan view of a state before insulating tape has been attached to the welded portion between the electrode terminal and the tab member in the battery module of Fig. 1. For convenience, an explanation will be given by taking as an example insulating tape 60 attached to the positive electrode terminal 41 shown in Figs. 5 to 7.

[0061] 5 to 7, the main body attachment portion 61 and the tab attachment portion 62 include a straight boundary line (L1) and a curved boundary line (L2). The straight boundary line (L1) is formed along the boundary between the main body portion 51 and the neck portion. A pair of second neck portions 532 are linearly arranged in the neck portion, and the straight boundary line (L1) is set corresponding to the pair of second neck portions 532. The curved boundary line (L2) is formed along the circular opening 224 of the tab holder 22 and is connected to the straight boundary line (L1).

[0062] The connection portion 63 is formed on the curved boundary line (L2) and connects the body attachment portion 61 and the tab attachment portion 62 to each other, and they are separated from each other when the insulating tape 60 is attached to the tab member 50. The other portion of the curved boundary line (L2) not including the connection portion 63 and the straight boundary line (L1) are connected to each other to complete the cutting line (CL).

[0063] The connection parts 63 may be provided at both ends of the diameter direction of the opening 224 of the holder at positions parallel to the straight boundary line (L1). When the body attachment part 61 is attached to the body part 51, the tab attachment part 62 can be separated from the body attachment part 61 in a balanced state. That is, the time difference when separated from the connection parts 63 on both sides is minimized, and the tab attachment part 62 can be accurately attached to the second tab part 522 and the welding part of the positive terminal 41.

[0064] The tab holder 22 and the positive electrode terminal 41 have a step between them, and the second neck portion 532 has a length corresponding to the step. That is, in the tab member 50, the second neck portion 532 is bent at the second auxiliary portion 512 of the main body portion 51, and the second tab portion 522 is bent at the second neck portion 532.

[0065] In this case too, the insulating tape 60 is attached to the main body portion 51 of the tab member 50 at the separated main body attachment portion 61, and the tab attachment portion 62 is separated from the main body attachment portion 61 through the connection portion 63 and attached to the second tab portion 522.

[0066] Therefore, the welded portion between the second tab portion 522 and the positive electrode terminal 41 is insulated by the tab attachment portion 62. The welded portion between the positive electrode terminal 41 and the second tab portion 522 can be prevented from corroding, that is, from galvanic corrosion.

[0067] In this way, there is no space between the tab attachment portion 62 of the insulating tape 60 and the second tab portion 522. That is, electrical insulation for the welded portion is formed with a minimum area of ​​the insulating tape 60, so that the insulating tape 60 can be saved.

[0068] In addition, since the insulating tape 60 has the main body attachment portion 61 and the tab attachment portion 62 connected to the connection portion 63, in the process of attaching the main body attachment portion 61 to the main body portion 51, the tab attachment portion 62 is separated from the main body attachment portion 61 and attached to the second tab portion 522, thereby improving workability.

[0069] Various embodiments of the present invention will be described below. Descriptions of configurations that are the same as those of the first embodiment and the previously described embodiments will be omitted, and only configurations that are different from those of the first embodiment and the previously described embodiments will be described.

[0070] 8 is a plan view of a battery module according to a second embodiment of the present invention before an insulating tape is attached to a welded portion between an electrode terminal and a tab member. Referring to FIG. 8, in an insulating tape 260 applied to a battery module of the second embodiment, a connecting portion 263 is formed on a straight boundary line (L21) and a curved boundary line (L22) to connect a body attachment portion 261 and a tab attachment portion 262 to each other, but they are separated from each other when the insulating tape 260 is attached to a tab member 50. The other portion of the curved boundary line (L22) not having the connecting portion 263 and the other portion of the straight boundary line (L21) are connected to each other to complete a cutting line (CL2).

[0071] The connection parts 263 may be provided at the center of the straight boundary line (L21) and at the center of the curved boundary line (L22). That is, the connection parts 263 may be provided at both ends in the diameter direction of the opening 224 of the holder. When the body attachment part 261 is attached to the body part 51, the tab attachment part 262 can be separated from the body attachment part 261 in a balanced state. That is, the time difference when separated from the connection parts 263 on both sides is minimized, and the tab attachment part 262 can be accurately attached to the second tab part 522 and the welding part of the positive terminal 41.

[0072] Therefore, the welded portion of the second tab portion 522 and the positive electrode terminal 41 is electrically insulated by the tab attachment portion 262. The welded portion of the positive electrode terminal 41 and the second tab portion 522 can be prevented from corroding, that is, from galvanic corrosion.

[0073] FIG. 9 is a perspective view of a battery module according to a third embodiment of the present invention, showing a state in which insulating tape has been attached to a welded portion between an electrode terminal and a tab member, and FIG. 10 is a plan view of the battery module of FIG. 9, showing a state before insulating tape has been attached to the welded portion between the electrode terminal and the tab member.

[0074] 9 and 10, in a battery module 3 of the third embodiment, an insulating tape 360 ​​includes a body attachment portion 361, a neck attachment portion 363, and a tab attachment portion 362 which are connected to each other. The body attachment portion 361 and the tab attachment portion 362 are separated at a cutting line (CL3).

[0075] The main body attachment portion 361 is attached to the main body portion 51, the neck attachment portion 363 is attached to the neck portion (for example, the second neck portion 532), and the tab attachment portion 362 is attached to the tab portion (for example, the second tab portion 522).

[0076] The body attachment portion 361 and the neck attachment portion 363 define a straight boundary line (L31) along the boundary between the body portion 51 and the second neck portion 532. That is, the neck attachment portion 363 is connected to the body attachment portion 361 by the straight boundary line (L31).

[0077] The neck attachment portion 363 and the tab attachment portion 362 define a curved boundary line (L32) along the circular opening 224 of the tab holder 22 and are connected to the straight boundary line (L31). That is, the curved boundary line (L32) forms a cutting line (CL3).

[0078] Of the neck attachment portion 363 and the tab attachment portion 362, the portion that is set adjacent to the main body attachment portion 361 and attached to the neck portion (see Figure 5, second neck portion 532) defines the neck attachment portion 363, and the other portion excluding the neck attachment portion 363 defines the tab attachment portion 362.

[0079] In the attachment process, since the neck attachment portion 363 is connected, the main body attachment portion 361 can be attached to the main body portion 51, the neck attachment portion 363 can be attached to the second neck portion 532, and then the tab attachment portion 362 can be attached to the second tab portion 522.

[0080] In this case, the tab attachment portion 362 is pulled toward the neck attachment portion 363 by an amount equal to the width (W) of the neck attachment portion 363, but the second tab portion 522 can be sufficiently insulated. For this reason, the width (W) of the neck attachment portion 363 is formed to be less than half (W≦D / 2) the diameter (D) of the opening 224 of the tab holder 22. The insulating tape 360 ​​of the third embodiment further includes a neck attachment portion 363, and can further insulate the second neck portion 532.

[0081] Fig. 11 is a plan view of a battery module according to a fourth embodiment of the present invention, showing a state before an insulating tape is attached to a welded portion between an electrode terminal and a tab member. Referring to Fig. 11, an insulating tape 460 applied to the battery module of the fourth embodiment includes a body attachment portion 461, a neck attachment portion 463, and a tab attachment portion 462, which are connected to each other. The body attachment portion 461 and the tab attachment portion 462 are separated at a cutting line (CL4).

[0082] The main body attachment portion 461 is attached to the main body portion 51, the neck attachment portion 463 is attached to the neck portion (for example, the second neck portion 532, see Figure 9), and the tab attachment portion 462 is attached to the tab portion (for example, the second tab portion 522, see Figure 9).

[0083] The body attachment portion 461 and the neck attachment portion 463 define a straight boundary line (L41) along the boundary between the body portion 51 and the second neck portion 532. The neck attachment portion 463 is formed on the straight boundary line (L41) and connects the body attachment portion 461 and the tab attachment portion 462 to each other. The neck attachment portion 463 includes a pair of connecting neck portions 631 provided on both ends of the straight boundary line (L41), and a partial cutting line 632 to partially connect and partially separate the pair of connecting neck portions 631. The partial cutting line 632 is formed in the direction of the straight boundary line (L41) and can be formed in one portion or multiple portions. The curved boundary line (L42) forms the cutting line.

[0084] The partial cutting line 632 may be formed as one or a plurality of separated lines along the direction of the straight boundary line (L41). In this embodiment, the partial cutting line 632 is formed as one along the direction of the straight boundary line (L41) and is provided as a plurality of lines in the width (W) direction, and when the neck attachment portion 463 is attached to the second neck portion 532, the interval between the partial cutting lines 632 is widened, and the tab attachment portion 462 sufficiently covers the welded portion between the positive terminal 41 and the second tab portion 522 to be electrically insulated.

[0085] Although the preferred embodiment of the present invention has been described above, the present invention is not limited thereto, and can be embodied in various modified forms within the scope of the claims, the description of the invention, and the accompanying drawings, which of course also fall within the scope of the present invention. [Explanation of symbols]

[0086] 1, 3 Battery module 10 Battery Cells 20 Holder 21 Bottom Holder 22 Tab Holder 23 Fastening members 24 Joint 25 Protrusion 30 Battery Management System (BMS) 40 electrode terminal 41 Positive terminal 42 Negative terminal 50 Tab member 51 Main body 54 Output terminal 60 Electrical Tape 61 Main body attachment part 62 Tab attachment part 63 Connection 64 Incision 221 Mounting groove 222 Protrusion 223 Rib 224 Opening 260 Insulating Tape 261 Main body attachment part 262 Tab attachment part 263 Connection 360 Insulating Tape 361 Main body attachment part 362 Tab attachment part 363 Neck attachment 460 Insulating Tape 461 Main body attachment part 462 Tab attachment part 463 Neck attachment 511 First Auxiliary Department 512 Second Auxiliary Division 521 First tab part 522 Second tab part 531 First Neck 532 Second neck 631 Connection neck 632 Partial Cutting Line C11 11th connection C12 12th connection C13 13th Connection C21 21st Connection C22 22nd Connection C23 23rd Connection CL cutting line CL2 cutting line CL3 cutting line CL4 Cutting Line H-bond hole L1 Straight boundary line L2 Curved boundary line L21 Straight boundary line L22 Curved boundary line L31 Straight boundary line L32 Curved boundary line L41 Straight boundary line L42 Curved boundary line R1 1st column R2 Second column W width

Claims

1. A plurality of battery cells; A holder that houses the battery cell; a tab member that is installed in the holder and welded to an electrode terminal of the battery cell; an insulating tape for insulating the tab member; The tab member includes: A main body portion disposed on the holder; a neck portion bent downward from the body portion and disposed within the holder; a tab portion bent at the neck portion to connect to the electrode terminal, The insulating tape is a body attachment portion attached to the body portion; a tab attachment portion separated from the body attachment portion along a cutting line and attached to the tab portion.

2. The insulating tape is The battery module according to claim 1 , further comprising a connection portion that connects the body attachment portion and the tab attachment portion to each other and is separated from each other during a bonding process.

3. the battery cell is a cylindrical battery, The holder is The battery module according to claim 2 , further comprising: a circular opening portion that houses the battery cell and is open to correspond to both ends of the battery cell in an axial direction.

4. The body attachment portion and the tab attachment portion are a straight boundary line formed along the boundary between the body portion and the neck portion; The battery module according to claim 3 , further comprising: a curved boundary line formed along the circular opening of the holder and connected to the straight boundary line.

5. the connection portion is formed on the curved boundary line and connects the body attachment portion and the tab attachment portion to each other, but is separated from each other when attached; The battery module of claim 4 , wherein a remaining portion of the curved boundary line and the straight boundary line complete the cutting line.

6. The battery module according to claim 5 , wherein the connection portions are provided at both ends in a diameter direction of the opening of the holder, at positions parallel to the straight boundary line.

7. the connection portions are formed on the straight boundary line and the curved boundary line, respectively, and connect the body attachment portion and the tab attachment portion to each other, but are separated from each other when attached; The battery module of claim 4 , wherein the remaining portion of the curved boundary line and the remaining portion of the straight boundary line complete the cutting line.

8. The battery module according to claim 7 , wherein the connection portions are provided at the center of the straight boundary line and the center of the curved boundary line, which correspond to both ends of the opening of the holder in the diametrical direction.

9. A plurality of battery cells; A holder that houses the battery cell; a tab member that is installed in the holder and welded to an electrode terminal of the battery cell; an insulating tape for insulating the tab member; The tab member includes: A main body portion disposed on the holder; a neck portion bent downward from the body portion and disposed within the holder; a tab portion bent at the neck portion and connected to the electrode terminal, The insulating tape is a body attachment portion attached to the body portion; a neck attachment portion connected to the body attachment portion and attached to the neck portion; a tab attachment portion separated from the body attachment portion along a cutting line, connected to the neck attachment portion, and attached to the tab portion.

10. The body attachment portion and the neck attachment portion are A straight boundary line is set along the boundary between the body portion and the neck portion; The neck attachment portion and the tab attachment portion are A curved boundary line is set along the circular opening of the holder, and is connected to the straight boundary line; Among the neck attachment portion and the tab attachment portion, a portion adjacent to the body attachment portion and attached to the neck portion defines the neck attachment portion; The battery module according to claim 9 , wherein a remaining portion excluding the neck attachment portion defines a tab attachment portion.

11. The neck attachment portion is connected to the body attachment portion at the straight boundary line; The battery module of claim 10 , wherein the curved boundary line forms the cutting line.

12. The width of the neck attachment portion is The battery module according to claim 11 , which is formed with a diameter less than ½ of the diameter of the opening of the holder.

13. The neck attachment portion is a straight boundary line is formed on the body attachment portion and the tab attachment portion, A pair of connecting neck portions provided at both ends of the straight boundary line; at least one partial cut line formed in a direction of the straight boundary line to partially connect and partially separate the pair of connecting neck portions; The battery module of claim 10 , wherein the curved boundary line forms the cutting line.

14. The partial cutting line is The battery module of claim 13 , wherein the battery module is formed of one or a plurality of separated portions along a direction of the straight boundary line.

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