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

[0005] ,

[0001] The present invention relates to a battery module, and more particularly, to a battery module that insulates a tab member connecting battery cells with an insulating tape.

Background Art

[0002] A rechargeable battery is a battery that repeats charging and discharging, unlike a primary battery. Small-capacity rechargeable batteries are used in portable small electronic devices such as mobile phones, notebook computers, and camcorders. Large-capacity and high-density rechargeable batteries are used as power sources for driving motors of hybrid vehicles and electric vehicles and for energy storage.

[0003] A rechargeable battery requires a relatively high energy density and can be used as a battery module including a plurality of battery cells connected in series and / or in parallel so as to drive a motor of a hybrid vehicle, for example. For example, a battery module is formed by connecting electrode terminals of a plurality of battery cells configured in a number that meets a desired amount of electric power to each other in order to realize a relatively high-output battery module (for example, an electric vehicle).

[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 in parallel with tabs. Since the voltage and current of a battery module are high depending on the usage conditions of a consumer, the battery module includes tabs connecting battery cells and a battery management system connected to the tabs.

[0005] At this time, an insulating tape is used to insulate the tabs. Since the insulating tape is integrally formed, there is a step between the holder and the battery cell, and thus, when the tab is bent, it adheres to the upper side of the holder and the tab, so that the welded portion of the electrode terminal and the tab cannot be directly insulated. That is, a space separated from the insulating tape is formed in the welded portion of the electrode terminal and the tab, and the portion exposed in this empty space becomes vulnerable to galvanic corrosion. [Overview of the project] [Problems that the invention aims to solve]

[0006] One embodiment of the present invention provides a battery module that provides insulation by attaching insulating tape to the tab member even when there is a step between the holder and the 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 housing the battery cells, a tab member installed in the holder and welded to the electrode terminals of the battery cells, and an insulating tape for insulating the tab member. The tab member includes a main body portion placed on the holder, a neck portion bent downward from the main body portion and placed inside the holder, and a tab portion bent from the neck portion and connected to the electrode terminals. The insulating tape includes a main body attachment portion attached to the main body portion, and a tab attachment portion separated from the main body attachment portion by a cutting line and attached to the tab portion.

[0008] The insulating tape may include connecting parts that connect the main body attachment part and the tab attachment part to each other, and that are separated from each other during the attachment process.

[0009] The battery cell is a cylindrical battery, and the holder can house the battery cell and form a circular opening that is open corresponding to both axial ends of the battery cell.

[0010] The main body attachment portion and the tab attachment portion may include a straight boundary line formed along the boundary between the main 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 point is formed along the curved boundary line, connecting the main body attachment point and the tab attachment point to each other. They separate from each other upon attachment, and the remaining portion of the curved boundary line and the straight boundary line can complete the cutting line.

[0012] The connecting parts can be provided at both ends of the holder's opening in the diametrical direction, parallel to the straight boundary line.

[0013] Connection points are formed one each on the straight boundary line and the curved boundary line, connecting the main body attachment point and the tab attachment point to each other, separating them upon attachment, and allowing the other parts of the curved boundary line and the other parts of the straight boundary line to complete the cutting line.

[0014] The connecting parts can be provided at the center of the straight boundary lines and the center of the curved boundary lines, respectively, corresponding to both ends of the holder's opening in the diametrical direction.

[0015] A battery module according to one embodiment of the present invention includes a plurality of battery cells, a holder for housing the battery cells, tab members installed in the holder and welded to the electrode terminals of the battery cells, and insulating tape for insulating the tab members. The tab members include a main body portion placed on the holder, a neck portion bent downward from the main body portion and placed inside the holder, and a tab portion bent from the neck portion and connected to the electrode terminals. The insulating tape includes a main body attachment portion attached to the main body portion, a neck attachment portion connected to the main body attachment portion and attached to the neck portion, and a tab attachment portion separated from the main body attachment portion by a cutting line, connected to the neck attachment portion and attached to the tab portion.

[0016] The main body attachment portion and the neck attachment portion are connected to the straight boundary line along the boundary between the main body portion and the neck portion, and the neck attachment portion and the tab attachment portion are connected to the straight boundary line by a curved boundary line along the circular opening of the holder. The portion of the neck attachment portion and the tab attachment portion adjacent to the main body attachment portion is set as the neck attachment portion, and the portion attached to the neck portion is set as the tab attachment portion.

[0017] The neck attachment point can be connected to the main body attachment point with a straight boundary line, while the curved boundary line can form a cutting line.

[0018] The width of the neck attachment portion can be formed to be less than half the diameter of the holder opening.

[0019] The neck attachment portion is formed on a straight boundary line and connects the body attachment portion and the tab attachment portion to each other, and includes a pair of connecting neck portions provided at both ends of the straight boundary line, and at least one partial cutting 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 cutting line.

[0020] The partial cutting lines can be formed as one or multiple separate lines along the direction of the straight boundary line. [Effects of the Invention]

[0021] In one embodiment of the battery module, there is a step between the holder and the battery cell. Even when the tab member is bent, the insulating tape can be attached to the main body and tab portion (for example, the first tab portion and the second tab portion) connected to the neck portion (for example, the first neck portion and the second neck portion) by the tab member, thereby insulating the main body 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, the space between the insulating tape and the tab portion is eliminated, thus saving insulating tape.

[0023] Furthermore, since insulating tape is provided on both the main body attachment portion and the tab attachment portion, the tab attachment portion separates from the main body attachment portion and attaches to the tab portion during the process of attaching the main body attachment portion to the main body, thereby improving the workability of attaching the insulating tape. [Brief explanation of the drawing]

[0024] [Figure 1] This is an exploded perspective view of a battery module according to the first embodiment of the present invention. [Figure 2] Figure 1 shows the assembled battery module, viewed from above. [Figure 3] It is a perspective view of the battery module of FIG. 2 seen from the back. [Figure 4] It is a perspective view of the tab member of FIG. 1. [Figure 5] In the battery module of FIG. 1, it is a perspective view of the state where an insulating tape is attached to the welded portion of the electrode terminal and the tab member. [Figure 6] It is a cross-sectional view taken along line VI-VI of FIG. 5. [Figure 7] In the battery module of FIG. 1, it is a plan view of the state before attaching an insulating tape to the welded portion of the electrode terminal and the tab member. [Figure 8] In the battery module according to the second embodiment of the present invention, it is a plan view of the state before attaching an insulating tape to the welded portion of the electrode terminal and the tab member. [Figure 9] In the battery module according to the third embodiment of the present invention, it is a perspective view of the state where an insulating tape is attached to the welded portion of the electrode terminal and the tab member. [Figure 10] In the battery module of FIG. 9, it is a plan view of the state before attaching an insulating tape to the welded portion of the electrode terminal and the tab member. [Figure 11] In the battery module according to the fourth embodiment of the present invention, it is a plan view of the state before attaching an insulating tape to the welded portion of the electrode terminal and the tab member.

Embodiments for Carrying Out the Invention

[0025] Hereinafter, referring to the accompanying drawings, embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention belongs can easily implement them. However, the present invention can be implemented in various different forms and is not limited to the embodiments described here. In order to clearly explain the present invention in the drawings, unnecessary parts for the explanation are omitted, and the same or similar components throughout the specification are given the same reference numerals.

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

[0027] Referring to Figures 1 to 3, the battery module 1 of the first embodiment includes a plurality of battery cells 10, a holder 20 for housing the battery cells 10, tab members 50 welded to the electrode terminals 40 of the battery cells 10, and insulating tape 60 for electrically insulating the tab members 50.

[0028] Multiple battery cells 10 consist of cylindrical batteries, each cylindrical battery having electrode terminals 40 at both axial ends. Specifically, the electrode terminals 40 include a positive electrode terminal 41 and a negative electrode terminal 42, each battery cell 10 having both axial ends.

[0029] The holder 20 includes a bottom holder 21 and a tab holder 22. The bottom holder 21 and the tab holder 22 have a honeycomb structure inside 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 connected to each other in a third direction (z-axis direction) intersecting the second direction and are firmly fastened together by a fastening member 23.

[0030] In the configuration shown in Figure 1, the bottom holder 21 accommodates the lower part of the battery cell 10, and the tab holder 22 accommodates the upper part of the battery cell 10. In this configuration, the bottom holder 21 and the tab holder 22 are fastened together by the fastening member 23.

[0031] Furthermore, the bottom holder 21 and the tab holder 22 can be further connected by a snap-fit ​​structure consisting of a connecting portion 24 provided on the outside of the bottom holder 21 and a projection 25 provided on the outside of the tab holder 22 that corresponds to the connecting portion 24.

[0032] Multiple battery cells 10 are housed in a holder 20 and arranged in parallel first and second rows (R1 and R2). The first and second rows (R1 and R2) are set in a second direction, spaced apart from each other in a first direction, and arranged repeatedly.

[0033] For example, in the first column (R1), the negative terminal 42 is positioned at the top and the positive terminal 41 is positioned at the bottom. In the second column (R2), the positive terminal 41 is positioned at the top and the negative terminal 42 is positioned at the bottom.

[0034] The axial centers of the battery cells 10 arranged in the first column (R1) and the axial centers of the battery cells 10 arranged in the second column (R2) are offset from each other in a direction that intersects the first column (R1) and the second column (R2). Therefore, the spacing between adjacent cylindrical battery cells 10 can be made the same.

[0035] In other words, with respect to the battery cells 10 arranged in the first column (R1), the battery cells 10 arranged in the second column (R2) remain shifted in the second direction (y-axis direction). Therefore, the sides of the two battery cells 10 located at the ends of the first column (R1) and the second column (R2) are offset in the direction of arrangement of the first column (R1) and the second column (R2).

[0036] The tab member 50 is positioned in the mounting grooves 221 of the bottom holder 21 and the tab holder 22, connecting the corresponding electrode terminals 40 and the like to each other. A projection 222 is provided on one side of the mounting groove 221, which is coupled to the 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 its position before welding it to the electrode terminal 40. In addition, the protrusion 222 connects to the coupling hole (H) when the position setting of the tab member 50 is complete, preventing the tab member 50 from separating from the mounting groove 221.

[0038] For example, the tab member 50 can be formed from nickel material and 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 sheet of material.

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

[0040] Figure 4 is a perspective view of the tab member of Figure 1. Referring again to Figure 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 houses the battery cell 10 and has circular openings 224 that open corresponding to both axial ends of the battery cell 10 (see Figures 1 and 2). The openings 224 are formed in a structure that also corresponds to the bottom holder 21, and for convenience, the description of the bottom holder 21 will be omitted.

[0042] The connection structure of the first tab portion 521 includes an eleventh connection (C11) welded in two branches to the negative terminal 42 and bent to extend in the height direction (z-axis direction), followed by a twelfth connection (C12) extending in a direction perpendicular to the first row (R1), and then a thirteenth connection (C13) extending in the direction of the first row (R1) 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) welded to the positive terminal 41 in two branches and bent to extend in the height direction (z-axis direction), followed by a 22nd connection (C22) extending in a direction perpendicular to the second row (R2), and then a 23rd connection (C23) extending in the direction of the second row (R2) through the second auxiliary portion 512 to connect to the main body portion 51.

[0044] The connection structure of the first tab section 521, which includes the 11th connection (C11), the 12th connection (C12), and the 13th connection (C13), and the connection structure of the second tab section 522, which includes the 21st connection (C21), the 22nd connection (C22), and the 23rd connection (C23), are configured such that the negative and positive terminals 42 and 41 are connected to the main body section 51 via a long distance.

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

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

[0047] The first tab portion 521 is connected to the negative terminal 42 of 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 positioned in the first row (R1). The second tab portion 522 is connected to the positive terminal 41 of 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 positioned in the second row (R2).

[0048] The first auxiliary section 511 comprises a pair of electrically connected first tab sections 521, which connect in parallel the negative terminals 42 of two battery cells 10 arranged in a second direction (y-axis direction). The first auxiliary section 511 bypasses the two battery cells 10 arranged in a first row (R1) direction and is connected to the main body section 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 is positioned on the side inside the opening 224 of the tab holder 22. A pair of first tab portions 521 are connected to the first neck portion 531, which avoids the two battery cells 10 arranged in the first row (R1) direction. The pair of first tab portions 521 are connected to the respective negative terminals 42 of the two battery cells 10.

[0050] The second auxiliary section 512 comprises a pair of electrically connected second tab sections 522, which connect the positive terminals 41 of two battery cells 10 arranged in a second direction (y-axis direction) in parallel. The second auxiliary section 512 bypasses the two battery cells 10 arranged in a second row (R2) direction and is connected to the main body section 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 is positioned on the side inside the opening 224 of the tab holder 22. A pair of second tab portions 522 are connected to the second neck portion 532, which avoids the two battery cells 10 arranged 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 path of the two battery cells 10 located in the first row (R1) the same up to the main body portion 51. 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 of the second column (R2) make the current path of the two battery cells 10 located in the second column (R2) the same up to the main body portion 51. Therefore, the voltage difference between the battery cells 10 in the second column (R2) can be minimized.

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

[0055] Therefore, the current from the two battery cells 10 connected in parallel in the first row (R1) flows to the main body 51, and the current from the two battery cells 10 connected in parallel in the second row (R2) also flows to the main body 51.

[0056] In this case, 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. Therefore, it is possible to prevent a shortening of the battery cell lifespan 10.

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

[0058] The insulating tape 60 includes a connecting portion 63 that connects the main body attachment portion 61 and the tab attachment portion 62 to each other and separates them during the attachment process. Because the connecting portion 63 separates during the attachment process, the main body attachment portion 61 and the tab attachment portion 62 can be attached to the main body portion 51 and the first and second tab portions 521 and 522, respectively.

[0059] On the other hand, the tab holder 22 has ribs 223 that protrude between adjacent tab members 50 in a first direction and extend in a second direction. The insulating tape 60 also has cut portions 64 that correspond to the ribs 223. When the insulating tape 60 is placed on the tab members 50 before adhesion, the cut portions 64 are connected to the ribs 223, thereby preventing the insulating tape 60 from flowing.

[0060] Figure 5 is a perspective view of the battery module in Figure 1 with insulating tape attached to the welded portion between the electrode terminal and the tab member. Figure 6 is a cross-sectional view taken along the line VI-VI in Figure 5. Figure 7 is a plan view of the battery module in Figure 1 before insulating tape is attached to the welded portion between the electrode terminal and the tab member. For convenience, the insulating tape 60 attached to the positive electrode terminal 41 shown in Figures 5 to 7 will be used as an example for explanation.

[0061] Referring to Figures 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 arranged linearly in the neck portion, and the straight boundary line (L1) is set corresponding to this pair of second neck portions 532. The curved boundary line (L2) is formed along the circular opening 224 of the tab holder 22 and connects to the straight boundary line (L1).

[0062] The connecting portion 63 is formed on the curved boundary line (L2) and connects the main body attachment portion 61 and the tab attachment portion 62 to each other, and separates from each other when the insulating tape 60 is attached to the tab member 50. The other parts of the curved boundary line (L2) that do not have the connecting portion 63 and the straight boundary line (L1) connect to each other to complete the cutting line (CL).

[0063] The connecting portions 63 can be provided at both ends in the diametrical direction of the holder opening 224, parallel to the straight boundary line (L1). When the main body attachment portion 61 is attached to the main body portion 51, the tab attachment portion 62 can be separated from the main body attachment portion 61 in a balanced manner. That is, the time difference in separation from both connecting portions 63 is minimized, so that the tab attachment portion 62 can be accurately attached to the welded portion of the second tab portion 522 and the positive terminal 41.

[0064] The tab holder 22 and the positive terminal 41 have a step between them, and the second neck portion 532 has a length corresponding to the step. That is, the tab member 50 has the second neck portion 532 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 as well, 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 connecting portion 63 and attached to the second tab portion 522.

[0066] Therefore, the welded portion of the second tab portion 522 and the positive terminal 41 is insulated by the tab attachment portion 62. This prevents corrosion, i.e., galvanic corrosion, of the welded portion of the positive terminal 41 and the second tab portion 522.

[0067] In this way, the space between the tab attachment portion 62 and the second tab portion 522 of the insulating tape 60 is eliminated. That is, electrical insulation to the welded portion is formed with the minimum area of ​​the insulating tape 60, so the amount of insulating tape 60 can be saved.

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

[0069] The following describes various embodiments of the present invention. Descriptions of configurations identical to those of the first embodiment and previously described embodiments will be omitted, and descriptions of configurations that differ from each other will be provided.

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

[0071] The connecting portion 263 can be provided at the center of the straight boundary line (L21) and the center of the curved boundary line (L22), respectively. That is, the connecting portion 263 can be provided at both ends in the diametrical direction of the opening 224 of the holder. When the main body attachment portion 261 is attached to the main body portion 51, the tab attachment portion 262 can be separated from the main body attachment portion 261 in a balanced manner. That is, the time difference in separation from both connecting portions 263 is minimized, so that the tab attachment portion 262 can be accurately attached to the second tab portion 522 and the welded portion of the positive terminal 41.

[0072] Therefore, the welded portion of the second tab portion 522 and the positive terminal 41 is electrically insulated by the tab attachment portion 262. This prevents corrosion, i.e., galvanic corrosion, of the welded portion of the positive terminal 41 and the second tab portion 522.

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

[0074] Referring to Figures 9 and 10, in the battery module 3 of the third embodiment, the insulating tape 360 ​​includes a body attachment portion 361, a neck attachment portion 363, and a tab attachment portion 362 that connect to each other. The body attachment portion 361 and the tab attachment portion 362 are separated by a cut 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 main body attachment portion 361 and the neck attachment portion 363 are connected by a straight boundary line (L31) along the boundary between the main body portion 51 and the second neck portion 532. That is, the neck attachment portion 363 is connected to the main body attachment portion 361 by the straight boundary line (L31).

[0077] The neck attachment portion 363 and the tab attachment portion 362 set a curved boundary line (L32) along the circular opening 224 of the tab holder 22 and connect to a 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 adjacent to the main body attachment portion 361 that is attached to the neck portion (see Figure 5, second neck portion 532) is designated as the neck attachment portion 363, and the remaining portion excluding the neck attachment portion 363 is designated as 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 subsequently, 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 towards the neck attachment portion 363 by 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 the diameter (D) of the opening 224 of the tab holder 22 (W ≤ D / 2). The insulating tape 360 ​​of the third embodiment further comprises a neck attachment portion 363, which can further insulate the second neck portion 532.

[0081] Figure 11 is a plan view of a battery module according to a fourth embodiment of the present invention, before insulating tape is applied to the welded portion between the electrode terminals and the tab member. Referring to Figure 11, the insulating tape 460 applied to the battery module of the fourth embodiment includes a main attachment portion 461, a neck attachment portion 463, and a tab attachment portion 462 that are connected to each other. The main attachment portion 461 and the tab attachment portion 462 are separated by 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 main body attachment portion 461 and the neck attachment portion 463 set a straight boundary line (L41) along the boundary between the main body portion 51 and the second neck portion 532. The neck attachment portion 463 is also formed along the straight boundary line (L41) and connects the main 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 at 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 or more parts. A curved boundary line (L42) forms a cutting line.

[0084] The partial cutting lines 632 can be formed as one or a number of separate lines along the direction of the straight boundary line (L41). In this embodiment, the partial cutting lines 632 are formed as one along the direction of the straight boundary line (L41) and are provided as a number in the width (W) direction, and when the neck attachment portion 463 is attached to the second neck portion 532, the spacing between the partial cutting lines 632 widens, so that the tab attachment portion 462 sufficiently covers the welded portion between the positive terminal 41 and the second tab portion 522 and provides electrical insulation.

[0085] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and can be implemented in various ways within the scope of the claims, description of the invention, and accompanying drawings, and these also naturally fall within the scope of the present invention. [Explanation of Symbols]

[0086] 1, 3 Battery Modules 10 battery cells 20 holders 21 Bottom Holder 22 Tab Holders 23 Fastening members 24 Joint 25 Protrusion 30. Battery Management System (BMS) 40 electrode terminal 41 Positive terminal 42 Negative terminal 50 Tab members 51 Main body 54 Output terminal 60 Insulating Tape 61 Main body attachment part 62 Tab attachment area 63 Connection part 64 Incision 221 Mounting groove 222 Protrusion 223 Rib 224 Opening 260 Insulating Tape 261 Main body attachment part 262 Tab attachment area 263 Connection part 360 Insulating Tape 361 Main body attachment part 362 Tab attachment area 363 Neck attachment point 460 Insulating Tape 461 Main body attachment part 462 Tab attachment area 463 Neck attachment part 511 First auxiliary section 512 Second auxiliary section 521 First tab section 522 Second tab section 531 First neck section 532 Second neck section 631 Connection neck section 632 Partial cutting line C11 11th Connection C12 12th connection C13 13th Connection C21 Connection No. 21 C22 Connection No. 22 C23 Connection 23 CL cutting line CL2 Cutting Line CL3 Cutting Line CL4 Cutting Line H bond holes 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 First column R2, second column W width

Claims

1. Multiple battery cells, A holder for housing the aforementioned battery cell, A tab member is installed in the holder and welded to the electrode terminals of the battery cell, The tab member includes an insulating tape for insulating the tab member, The tab member is The main body portion is placed on top of the holder, A neck portion is bent downward from the main body and positioned inside the holder, It includes a tab portion that is bent at the neck portion and connected to the electrode terminal, The aforementioned insulating tape is The main body attachment portion attached to the main body portion, It includes the main body attachment portion and a tab attachment portion that is separated by a cutting line and attached to the tab portion, The aforementioned battery cell is a cylindrical battery, The aforementioned holder is The battery cell is housed in a circular opening that is open at both ends of the battery cell in the axial direction, The main body attachment portion and the tab attachment portion are, A straight boundary line formed along the boundary between the main body and the neck portion, A battery module comprising: a curved boundary line formed along a circular opening of the holder and connected to the straight boundary line.

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

3. The aforementioned connecting portion is formed on the curved boundary line and connects the main body attachment portion and the tab attachment portion to each other, but separates from each other when attached. The battery module according to claim 2, wherein the remaining portion of the curved boundary line and the straight boundary line complete the cutting line.

4. The battery module according to claim 3, wherein the connecting portions are provided at both ends of the holder in the diametrical direction of the opening, at positions parallel to the straight boundary line.

5. The aforementioned connecting portions are formed one each on the straight boundary line and the curved boundary line, connecting the main body attachment portion and the tab attachment portion to each other, but they separate from each other when attached. The battery module according to claim 2, wherein the remaining portion of the curved boundary line and the remaining portion of the straight boundary line complete the cutting line.

6. The battery module according to claim 5, wherein the connecting portion is provided at the center of the straight boundary line and the center of the curved boundary line, respectively, corresponding to both ends of the opening of the holder in the diametrical direction.

7. Multiple battery cells, A holder for housing the aforementioned battery cell, A tab member is installed in the holder and welded to the electrode terminals of the battery cell, The tab member includes an insulating tape for insulating the tab member, The tab member is The main body portion is placed on top of the holder, A neck portion is bent downward from the main body and positioned inside the holder, The neck portion is bent and includes a tab portion that connects to the electrode terminal, The aforementioned insulating tape is The main body attachment portion attached to the main body portion, A neck attachment portion that connects to the main body attachment portion and is attached to the neck portion, It includes a tab attachment portion that is separated from the main body attachment portion by a cutting line, connected to the neck attachment portion, and attached to the tab portion, The main body attachment portion and the neck attachment portion are, A straight boundary line is set along the boundary between the main body 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 connected to the straight boundary line, Of the neck attachment portion and the tab attachment portion, The portion adjacent to the main body attachment portion and attached to the neck portion is set to the neck attachment portion, The battery module, with the remaining portion after removing the neck attachment portion, has a tab attachment portion.

8. The neck attachment portion is, The aforementioned straight boundary line connects to the main body attachment portion, The battery module according to claim 7, wherein the curved boundary line forms the cutting line.

9. The width of the neck attachment portion is, The battery module according to claim 8, wherein the diameter of the opening of the holder is less than half the diameter of the opening.

10. The neck attachment portion is, Formed on the aforementioned straight boundary line, connecting the main body attachment portion and the tab attachment portion to each other, A pair of connecting neck portions are provided at both ends of the aforementioned straight boundary line, It includes at least one partial cutting line formed in the direction of the straight boundary line to partially connect and partially separate the pair of connecting neck portions, The battery module according to claim 7, wherein the curved boundary line forms the cutting line.

11. The aforementioned partial cutting line is The battery module according to claim 10, formed in one or more separate units along the direction of the straight boundary line.

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