Secondary battery module

Abstract

To provide a secondary battery module having a step difference between a holder and a battery cell, in which a discharge port is formed between a tab member and the holder even when the tab member is bent.SOLUTION: This secondary 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, an extension part that extends long with the width in the main body part, a neck part that is bent downward from the extension part and is disposed inside an opening of the holder, and a tab part that is bent at the neck part and is connected to the electrode terminal. The extension part and the opening part form a discharge port over the electrode terminal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a secondary battery module, and more particularly, to a secondary battery module that connects battery cells to tab members.

Background Art

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

[0003] A secondary battery requires a relatively high energy density and can be used as a secondary 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 secondary battery module is formed by connecting electrode terminals of a plurality of battery cells configured in a number that matches a desired amount of electric power to each other in order to realize a relatively high-output secondary battery module (for example, an electric vehicle).

[0004] For example, a secondary 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 secondary battery module are high depending on the usage conditions of a consumer, the secondary battery module includes tabs for 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. As a result, when the tab is bent, it adheres to the upper side of the holder and the tab, and thus the welded portion of the electrode terminal and the tab cannot be directly insulated. That is, a space is formed in which the welded portion of the electrode terminal and the tab is separated from the insulating tape, and the portion exposed in this empty space becomes vulnerable to galvanic corrosion.

[0006] Furthermore, because the insulating tape seals the space between the holder and the tab component, heat dissipation is difficult, resulting in low safety against thermal runaway. In addition, the heat generated internally remains inside the case housing the secondary battery module, further reducing safety against thermal runaway. [Overview of the project] [Problems that the invention aims to solve]

[0007] One embodiment of the present invention provides a secondary battery module that forms an outlet between the tab member and the holder even when there is a step between the holder and the battery cell and the tab member is bent.

[0008] One embodiment of the present invention provides a secondary battery module that forms an outlet between a tab member and a holder, even when there is a step between the holder and the battery cell, the tab member is bent, and insulating tape is attached to the tab member for insulation.

[0009] Another embodiment of the present invention is to provide a secondary battery module having a hole in the holder. [Means for solving the problem]

[0010] A secondary 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 insulating tape for insulating the tab member, wherein the tab member includes a main body portion disposed on top of the holder, an extension portion that has width and extends long from the main body portion, a neck portion that is bent downward from the extension portion and disposed inside the opening of the holder, and a tab portion that is bent from the neck portion and connected to the electrode terminals, the extension portion and the opening forming discharge ports above the electrode terminals.

[0011] The insulating tape may include a main attachment portion that is attached to the main body, an extension attachment portion that is connected to the main attachment portion and attached to the extension portion, and a tab attachment portion that is separated from the main attachment portion and the extension attachment portion by a cutting line and attached to the tab portion and the electrode terminal.

[0012] The insulating tape may include connection parts that connect the main attachment part and the extension attachment part to each other via tab attachment parts, and that are separated from each other during the attachment process.

[0013] The battery cell is a cylindrical rechargeable 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.

[0014] The extension is formed in two parts on either side of the opening of the slit formed in the extension direction, the neck is formed in pairs by connecting to two branches, and the tab is formed in pairs and can be connected to the neck.

[0015] The system further includes a case for housing the holder, the case may have a through-hole on at least one side, which is connected to a discharge port to release heat. [Effects of the Invention]

[0016] In one embodiment, the secondary battery module releases heat in advance through a discharge port formed between the tab member and the holder, thereby improving safety against thermal runaway. In another embodiment, the secondary battery module releases heat through holes in the case, further improving safety against thermal runaway.

[0017] Furthermore, the secondary battery module of one embodiment includes an extension attachment portion that connects the insulating tape to the main body attachment portion, and a tab attachment portion that is separated from the extension attachment portion and attached to the tab portion and electrode terminals. This prevents corrosion of the welded tab portion and electrode terminals, and also maintains a stable open state of the discharge port, thus not hindering the prevention of thermal runaway. [Brief explanation of the drawing]

[0018] [Figure 1] It is a perspective view of a secondary battery module according to an embodiment of the present invention. [Figure 2] It is an exploded perspective view of the state where the insulating tape is separated from the secondary battery module of FIG. 1. [Figure 3] It is an exploded perspective view of the state where the tab member is separated from the secondary battery module of FIG. 2. [Figure 4] It is a perspective view of the tab member shown in FIGS. 1 to 3. [Figure 5] In the secondary battery module of FIG. 1, it is a perspective view of the state where an insulating tape is attached to the welded portion between the electrode terminal and the tab member. [Figure 6] It is a plan view of the state before attaching the insulating tape to the tab member of FIG. 5. [Figure 7] It is a plan view of the state where the insulating tape is attached to the tab member of FIG. 6. [Figure 8] It is a cross-sectional view taken along line VIII-VIII in the state where the secondary battery module of FIG. 1 is built in the case. [Figure 9] It is a cross-sectional view taken along line IX-IX in the state where the secondary battery module of FIG. 1 is built in the case.

Mode for Carrying Out the Invention

[0019] <l 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 in the description are omitted, and the same or similar components throughout the specification are denoted by the same reference numerals.

[0020] FIG. 1 is a perspective view of a secondary battery module according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the state where the insulating tape is separated from the secondary battery module of FIG. 1, and FIG. 3 is an exploded perspective view of the state where the tab member is separated from the secondary battery module of FIG. 2.

[0021] Referring to FIGS. 1 to 3, a secondary battery module according to an embodiment includes a plurality of battery cells 10, a holder 20 that houses the battery cells 10, a tab member 50 welded to electrode terminals 40 of the battery cells 10, and an insulating tape 60 that electrically insulates the tab member 50.

[0022] The plurality of battery cells 10 are cylindrical secondary batteries, and electrode terminals 40 are provided at both axial ends of the cylindrical secondary batteries. That is, the electrode terminals 40 include a positive electrode terminal 41 and a negative electrode terminal 42 provided at both axial ends of each battery cell 10.

[0023] 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 inside to house 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 a fastening member 23.

[0024] In the state of FIGS. 1 to 3, the bottom holder 21 houses the lower side of the battery cell 10, and the tab holder 22 houses the upper side of the battery cell 10. In such a state, the bottom holder 21 and the tab holder 22 are fastened by a fastening member 23.

[0025] Further, the bottom holder 21 and the tab holder 22 can be further coupled by a snap fit structure of a coupling 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 coupling portion 24.

[0026] The plurality of battery cells 10 are housed in the holder 20 and arranged in parallel first row (R1) and second row (R2). The first row (R1) and the second row (R2) are set in the second direction, spaced apart from each other in the first direction, and repeatedly arranged.

[0027] 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.

[0028] 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.

[0029] In other words, the battery cells 10 located in the second column (R2) are shifted in the second direction (y-axis direction) relative to the battery cells 10 located in the first column (R1). 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 the arrangement of the first column (R1) and the second column (R2).

[0030] 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 corresponding coupling hole (H) of the tab member 50.

[0031] Therefore, the mounting groove 221 can set the position of the tab member 50 before welding it to the electrode terminal 40, and keep the position of the tab member 50 constant. 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.

[0032] As an 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 (see Figure 8). The tab member 50 can be formed by punching and bending a thin sheet material.

[0033] 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. The bottom holder 21 and the tab holder 22 can be appropriately opened from the sides to install the tab members 50.

[0034] Figure 4 is a perspective view of the tab member disclosed in Figures 1 to 3, and Figure 5 is a perspective view of the secondary battery module of Figure 1 with insulating tape attached to the welded portion between the electrode terminal and the tab member.

[0035] Referring to Figures 4 and 5, the tab member 50 includes a main body portion 51, a first extension tab portion 541 and a second extension tab portion 542 of the extension portion, 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.

[0036] 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. 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.

[0037] The connection structure of the first tab portion 521 includes an eleventh connection (C11) that is welded to the negative terminal 42 in two branches and bent, extending in the height direction (z-axis direction) through the first neck portion 531, followed by a twelfth connection (C12) that extends in a direction perpendicular to the first row (R1) through the first extension tab portion 541, and followed by a thirteenth connection (C13) that extends in the direction of the first row (R1) through the first auxiliary portion 511 to connect to the main body portion 51.

[0038] The connection structure of the second tab portion 522 includes a 21st connection (C21) which is welded to the positive terminal 41 in two branches and bent, extending in the height direction (z-axis direction) through the second neck portion 532, followed by a 22nd connection (C22) which extends in a direction perpendicular to the second row (R2) through the second extension tab portion 542, and followed by a 23rd connection (C23) which extends in the direction of the second row (R2) through the second auxiliary portion 512 to connect to the main body portion 51.

[0039] 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.

[0040] Therefore, the connection structure of the first tab portion 521 minimizes the difference in 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 in 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.

[0041] Referring again to Figures 1 to 5, 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 from 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).

[0042] 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 via the first neck portion 531, the first extension tab portion 541 and 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 via the second neck portion 532, the second extension tab portion 542 and the second auxiliary portion 512, and is positioned in the second row (R2).

[0043] 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.

[0044] The first extension tab portion 541 extends horizontally from the first auxiliary portion 511 of the main body portion 51 and is formed in two branches on both sides of the opening of the slit formed in the extension direction. The second extension tab portion 542 extends horizontally from the second auxiliary portion 512 of the main body portion 51 and is formed in two branches on both sides of the opening of the slit formed in the extension direction.

[0045] The first extension tab portion 541 and the first neck portion 531 are provided in a pair, bent downward from the first extension tab portion 541 and positioned on the side within the opening 224 of the tab holder 22 through the opening 224. The pair of first tab portions 521 are connected to the pair of first neck portions 531, avoiding the two battery cells 10 arranged in the first row (R1) direction and connected to the negative terminal 42 of each of the two battery cells 10.

[0046] 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 through the space between the two battery cells 10.

[0047] The second extension tab portion 542 extends horizontally from the second auxiliary portion 512 of the main body portion 51, and the second neck portion 532 is provided in a pair, bent downward from the second extension tab portion 542, and positioned on the side of the opening 224 in the tab holder 22 through the opening 224. The pair of second tab portions 522 are connected to the pair of second neck portions 532, avoiding the two battery cells 10 arranged in the second row (R2) direction, and are connected to the positive terminal 41 of each of the two battery cells 10.

[0048] The first tab portion 521, the first neck portion 531, the first extension tab portion 541, 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.

[0049] The second tab portion 522, second neck portion 532, second extension tab portion 542, and second auxiliary portion 512 of the second row (R2) make the current path 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.

[0050] 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.

[0051] 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.

[0052] In this case, since the main body 51 of the tab member 50 is shared between 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.

[0053] Referring to Figures 5 and 6, the first and second extension tabs 541 and 542 and the opening 224 form an outlet (OL) above the negative and positive terminals 42 and 41. That is, the outlet (OL) is set between the tab member 50 and the tab holder 22 when there is a step between the tab holder 22 and the battery cell 10 and the tab member 50 is bent. The outlet (OL) releases heat generated inside the secondary battery module in advance, thereby preventing thermal runaway of the secondary battery module and improving safety against thermal runaway.

[0054] Referring again to Figures 1 to 3 and Figures 5 and 7, the insulating tape 60 includes a main body attachment portion 61 attached to the main body portion 51, an extension attachment portion 621 attached to the first and second extension tab portions 541 and 542 of the extension portion, and a tab attachment portion 622 attached to the first and second tab portions 521 and 522 of the tab portion.

[0055] The tab attachment portion 622 for the integrally formed main body attachment portion 61 and extension attachment portion 621 is separated by a cutting line (CL). The main body attachment portion 61 and extension attachment portion 621 are attached to the main body portion 51 and the first and second extension tab portions 541 and 542, respectively, while the tab attachment portion 622 is attached to the first and second tab portions 521 and 522 of the tab portion and the negative and positive terminals 42 and 41.

[0056] The main body attachment portion 61 and the extension attachment portion 621, which are integrally formed with the insulating tape 60, are connected to each other with the tab attachment portion 622 and are separated from each other during the attachment process. For this reason, the insulating tape 60 further includes a connecting portion 63. Since the connecting portion 63 is separated during the attachment process, the main body attachment portion 61 and the extension attachment portion 621 can be attached to the main body portion 51 and the first and second extension tab portions 541 and 542, and the tab attachment portion 622 can be attached to the first and second tab portions 521 and 522.

[0057] 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, so that the insulating tape 60 does not flow.

[0058] Referring again to Figure 7, for convenience, we will explain using the example of the insulating tape 60 attached to the shown positive terminal 41.

[0059] The integrally formed extension attachment portion 621, main body attachment portion 61, and tab attachment portion 622 include a T-shaped boundary line (L1) and a curved boundary line (L2). The T-shaped boundary line (L1) is formed along the boundary between the extension attachment portion 621 and the tab attachment portion 622. The curved boundary line (L2) is formed along the boundary between the main body attachment portion 61 and the tab attachment portion 622.

[0060] A pair of second neck portions 532 are arranged linearly in the neck portion, and a first extension tab portion 541 is formed in a T shape in the extension portion. The T-shaped boundary line (L1) is set corresponding to this pair of second neck portions 532 and the first extension tab portion 541. A curved boundary line (L2) is formed along the circular opening 224 of the tab holder 22 and connects to the T-shaped boundary line (L1).

[0061] 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 622 to each other, but 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 a connecting portion 63 and the T-shaped boundary line (L1) are connected to each other to complete the cutting line (CL).

[0062] The connecting portions 63 can be provided at both ends in the diametrical direction of the holder opening 224, parallel to the T-shaped boundary line (L1). When the main body attachment portion 61 is attached to the main body portion 51, the tab attachment portion 622 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 622 can be accurately attached to the welded portion of the second tab portion 522 and the positive terminal 41.

[0063] 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 and the second extension tab portion 542 of the main body portion 51, and the second tab portion 522 is bent at the second neck portion 532.

[0064] In this case as well, the insulating tape 60 is attached to the main body portion 51 and the second extension tab portion 542 of the tab member 50 by the separated main body attachment portion 61 and extension attachment portion 621, and the tab attachment portion 622 is separated from the main body attachment portion 61 via the connecting portion 63 and attached to the second tab portion 522.

[0065] Therefore, the welded portion of the second tab portion 522 and the positive terminal 41 is insulated by the tab attachment portion 622. This prevents corrosion, i.e., galvanic corrosion, of the welded portion of the positive terminal 41 and the second tab portion 522.

[0066] In this way, the space between the tab attachment portion 622 of the insulating tape 60 and the second tab portion 522 is eliminated. That is, electrical insulation to the welded area is formed with the minimum area of ​​the insulating tape 60, so the amount of insulating tape 60 can be saved.

[0067] Furthermore, since the insulating tape 60 is provided with the main body attachment portion 61 and the tab attachment portion 622 connected to the connection portion 63, the tab attachment portion 622 separates from the main body attachment portion 61 and attaches 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.

[0068] Thus, even when the insulating tape 60 is attached, the first and second extension tab portions 541 and 542 and the opening 224 form an outlet (OL) above the positive terminal 41. That is, the outlet (OL) is set between the tab member 50 and the tab holder 22 when there is a step between the tab holder 22 and the battery cell 10 and the tab member 50 is bent. The outlet (OL) releases heat generated inside the secondary battery module in advance, thereby preventing thermal runaway of the secondary battery module and improving safety against thermal runaway.

[0069] Figure 8 is a cross-sectional view along line VIII-VIII with the secondary battery module of Figure 1 housed in a case, and Figure 9 is a cross-sectional view along line IX-IX with the secondary battery module of Figure 1 housed in a case.

[0070] Referring to Figures 8 and 9, the secondary battery module may further include a case 70 that houses the holder 20. The case 70 may be connected to an outlet (OL) and may have a through-hole (TH) on at least one side to dissipate heat. The holder 20 may also further have a corresponding hole (RH) in the portion of the case 70 corresponding to the through-hole (TH).

[0071] If heat is generated in one of the battery cells 10, it can be discharged to the outside through the outlet (OL) of the holder 20 and through the through-hole (TH) of the case 70, or through the corresponding hole (RH) and back to the through-hole (TH). Therefore, thermal runaway of the secondary battery module can be prevented.

[0072] 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]

[0073] 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 63 Connection part 64 Incision 70 cases 221 Mounting groove 222 Protrusion 223 Rib 224 Opening 511 First auxiliary section 512 Second auxiliary section 521 First tab section 522 Second tab section 531 First neck section 532 Second neck section 541 First extension tab section 542 Second extension tab section 621 Extension attachment part 622 Tab attachment area C11 11th Connection C12 12th connection C13 13th Connection C21 Connection No. 21 C22 Connection No. 22 C23 Connection 23 CL cutting line H bond holes L1 T-shaped boundary line L2 Curved Boundary Line OL outlet R1 First column R2, second column RH compatible hall TH through hole

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, The main body has an extension that is wide and extends for a long distance, A neck portion is bent downward from the extension and positioned inside the opening of the holder, It includes a tab portion that is bent at the neck portion and connected to the electrode terminal, The extension and the opening are A discharge port is formed above the electrode terminal. The aforementioned insulating tape is The main body attachment portion attached to the main body portion, An extension attachment portion that is connected to the main body attachment portion and attached to the extension portion, A secondary battery module comprising a tab attachment portion separated by a cutting line from the main body attachment portion and the extension attachment portion, and attached to the tab portion and the electrode terminal.

2. The aforementioned insulating tape is The secondary battery module according to claim 1, further comprising connecting portions that connect the tab attachment portion to the main body attachment portion and the extension attachment portion, and that are separated from each other during the attachment process.

3. The aforementioned battery cell is a cylindrical secondary battery, The aforementioned holder is The secondary battery module according to claim 1, comprising housing the battery cells and forming circular openings that are open corresponding to both ends of the battery cells in the axial direction.

4. The aforementioned extension is Two openings are formed on both sides of the slit that is formed in the extension direction, The aforementioned neck portion is The two are connected to form a pair, The aforementioned tab portion is A secondary battery module according to claim 1, formed in pairs and connected to the neck portion.

5. The present invention further includes a case for housing the aforementioned holder, The aforementioned case is, The secondary battery module according to claim 1, further comprising a through-hole on at least one side connected to the discharge port to release heat.

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