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 in which battery cells are connected to tab members. [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 secondary 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, in order to realize a secondary battery module with a relatively high output (e.g., an electric vehicle), a secondary 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 secondary 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 secondary 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 the welded portion between the electrode terminal and the tab cannot be directly insulated. In other words, the welded portion between the electrode terminal and the tab forms a space separated from the insulating tape, and the part exposed in this empty space is vulnerable to galvanic corrosion.

[0006] In addition, since the insulating tape closes the space between the holder and the tab member, it is difficult to release heat, which reduces safety against thermal runaway. Furthermore, the heat generated inside remains inside the case that houses the secondary battery module, which reduces safety against thermal runaway. Summary of the Invention [Problem to be solved by the invention]

[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 in which an outlet is formed between a tab member and a holder even when there is a step between the holder and a battery cell, the tab member is bent, and insulating tape is attached to the tab member to insulate it.

[0009] Another embodiment of the present invention provides a secondary battery module having a holder with a hole. [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 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 main body portion that is disposed on the holder, an extension portion that has a width and extends long from the main body portion, a neck portion that is bent downward from the extension portion and disposed inside an opening of the holder, and a tab portion that is bent from the neck portion and connects to the electrode terminal, and the extension portion and the opening form an outlet above the electrode terminal.

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

[0012] The insulating tape may include connection portions that connect the tab attachments to the body attachment and the extension attachment and are separated from each other during the attachment process.

[0013] The battery cell is a cylindrical secondary 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.

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

[0015] The device further includes a case for housing the holder, and the case may have a through hole on at least one side thereof connected to the outlet to release heat. Effect of the Invention

[0016] In the secondary battery module according to the embodiment, the heat is preliminarily released through the outlet formed between the tab member and the holder, thereby improving safety against thermal runaway. In the secondary battery module according to the embodiment, the heat is released through a hole in the case, thereby further improving safety against thermal runaway.

[0017] In addition, the secondary battery module of one embodiment includes an extended attachment portion that connects the insulating tape to the main body attachment portion, and a tab attachment portion that is separated from the extended attachment portion and attached to the tab portion and the electrode terminal, thereby preventing corrosion of the welded tab portion and electrode terminal, and also stably maintaining the open state of the discharge port, thereby not hindering the prevention of thermal runaway. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view of a secondary battery module according to an embodiment of the present invention; [Diagram 2] 2 is an exploded perspective view of the secondary battery module of FIG. 1 with an insulating tape separated therefrom. [Diagram 3] 3 is an exploded perspective view of the secondary battery module of FIG. 2 with a tab member separated therefrom. [Figure 4] FIG. 4 is a perspective view of the tab member shown in FIGS. 1 to 3. [Diagram 5] 1. FIG. 4 is a perspective view of the secondary battery module of FIG. 1 in a state where an insulating tape is attached to a welded portion between an electrode terminal and a tab member. [Figure 6] 6 is a plan view of the state before an insulating tape is attached to the tab member in FIG. 5. FIG. [Figure 7] 7 is a plan view of the tab member of FIG. 6 with an insulating tape attached thereto. FIG. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 1 in a state in which the secondary battery module is housed in a case. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 1 in a state in which the secondary battery module is housed in a case. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] 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.

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

[0021] 1 to 3, a secondary battery module of one 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.

[0022] The multiple battery cells 10 are cylindrical secondary batteries, and are provided with electrode terminals 40 at both ends of the cylindrical secondary 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.

[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 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.

[0024] 1 to 3, the bottom holder 21 accommodates the lower sides of the battery cells 10, and the tab holder 22 accommodates the upper sides of the battery cells 10. In this state, the bottom holder 21 and the tab holder 22 are fastened together by fastening members 23.

[0025] In addition, the bottom holder 21 and the tab holder 22 may be further connected to each other through a snap fit structure between 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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).

[0030] 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 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 the tab member 50 to the electrode terminal 40, and can keep the position of the tab member 50 constant. 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.

[0032] As an example, the tab member 50 can be formed to include a nickel material, electrically connects the battery cells 10 in parallel and / or series, and is electrically connected to a battery management system (BMS) 30 (see FIG. 8 ). The tab member 50 can be formed by stamping and bending a thin plate material.

[0033] As an example, the battery management system (BMS) 30 can be installed on the side surfaces 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 can be appropriately opened from the side surfaces.

[0034] FIG. 4 is a perspective view of the tab member disclosed in FIGS. 1 to 3, and FIG. 5 is a perspective view of the secondary battery module of FIG. 1 in a state where insulating tape is 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 extended tab portion 541 and a second extended 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 accommodates the battery cell 10 and has circular openings 224 that are open to correspond to both axial ends of the battery cell 10. The openings 224 are formed with a structure that corresponds to that of the bottom holder 21, and for convenience, a 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 into 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 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.

[0038] 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 bent, extending in the height direction (z-axis direction) through the second neck portion 532, a 22nd connection (C22) that extends in a direction perpendicular to the second row (R2) through the second extension tab portion 542, and 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.

[0039] The connection structure of the first tab portion 521, including the eleventh connection (C11), the twelfth connection (C12), and the thirteenth connection (C13), and the connection structure of the second tab portion 522, including the twenty-first connection (C21), the twenty-second connection (C22), and the twenty-third connection (C23), enable the negative and positive terminals 42, 41 to be connected to the main body portion 51 over a long distance.

[0040] Therefore, the difference between the overall distance from the connection structure of the first tab portion 521 to the final output end of the tab member 50 via the body portion 51 and the overall distance from the connection structure of the second tab portion 522 to the final output end of the tab member 50 via the body portion 51 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.

[0041] 1 to 5 again, main body portion 51 is disposed between the first row (R1) and the second row (R2) of battery cells 10 and is connected in the second direction (y-axis direction). As a result, main body portion 51 extending from the second direction (y-axis direction) further includes first auxiliary portion 511 and second auxiliary portion 512 connected in the first direction (x-axis direction).

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

[0043] 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.

[0044] The first extension tab portion 541 extends horizontally from the first auxiliary portion 511 of the main body portion 51 and is formed with 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 with 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, are bent downward from the first extension tab portion 541, and are disposed on a side surface within the opening 224 through the opening 224 of the tab holder 22. The pair of first tab portions 521 are connected to the pair of first neck portions 531, avoid the two battery cells 10 disposed in the first row (R1) direction, and are connected to the negative terminals 42 of each of the two battery cells 10.

[0046] 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 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 portions 532 are provided in a pair, are bent downward from the second extension tab portion 542, and are disposed on a side surface within the opening 224 through the opening 224 of the tab holder 22. The pair of second tab portions 522 are connected to the pair of second neck portions 532, avoid the two battery cells 10 disposed in the second row (R2) direction, and are connected to the positive terminals 41 of each of the two battery cells 10.

[0048] The first tab portion 521, the first neck portion 531, the first extended tab portion 541 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) 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, the second neck portion 532, the second extended tab portion 542 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.

[0050] In addition, the main body 51 is connected to the first auxiliary part 511 and the second auxiliary part 512, and connects in series two battery cells 10 connected in parallel in the first column (R1) and two battery cells 10 connected in parallel in the second column (R2).

[0051] 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.

[0052] At this time, since the body portion 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, shortening of the lifespan of the battery cells 10 can be prevented.

[0053] 5 and 6, the first and second extension tab portions 541, 542 and the opening 224 form an outlet (OL) above the negative and positive electrode terminals 42, 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 folded. 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] 1 to 3, 5 and 7 again, the insulating tape 60 includes a body attachment portion 61 attached to the body portion 51, an extension attachment portion 621 attached to the first and second extension tab portions 541, 542 of the extension portion, and a tab attachment portion 622 attached to the first and second tab portions 521, 522 of the tab portion.

[0055] The tab attachment portion 622 for the integrally formed main body attachment portion 61 and extended attachment portion 621 is separated at a cutting line (CL). The main body attachment portion 61 and the extended attachment portion 621 are attached to the main body portion 51 and the first and second extended tab portions 541 and 542, which are the extended portions, respectively, and 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 body attachment portion 61 and the extended attachment portion 621, which are integrally formed in the insulating tape 60, are connected to the tab attachment portion 622 and are separated from each other in the attachment process. For this reason, the insulating tape 60 further includes a connection portion 63. Since the connection portion 63 is separated in the attachment process, the body attachment portion 61 and the extended attachment portion 621 can be attached to the body portion 51 and the first and second extended 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] 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.

[0058] Referring again to FIG. 7, for convenience, the insulating tape 60 attached to the positive terminal 41 shown will be taken as an example for explanation.

[0059] The integrally formed extended 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 extended 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 linearly arranged in the neck portion, and a first extension tab portion 541 is formed in a T-shape in the extension portion, and a T-shape boundary line (L1) is set corresponding to the 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 is connected to the T-shape boundary line (L1).

[0061] The connection portion 63 is formed on a curved boundary line (L2) and connects the body attachment portion 61 and the tab attachment portion 622 to each other, but is 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) that is not provided with the connection portion 63 and the T-shaped boundary line (L1) are connected to each other to complete the cutting line (CL).

[0062] 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 T-shaped boundary line (L1). When the body attachment part 61 is attached to the body part 51, the tab attachment part 622 may be separated from the body attachment part 61 in a balanced state. That is, the time difference at which the tab attachment part 622 is separated from the connection parts 63 on both sides is minimized, and the tab attachment part 622 may be accurately attached to the welded part of the second tab part 522 and the positive terminal 41.

[0063] 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 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, too, the insulating tape 60 is attached to the main body portion 51 and the second extended tab portion 542 of the tab member 50 by the separated main body attachment portion 61 and extended attachment portion 621, and the tab attachment portion 622 is separated from the main body attachment portion 61 via the connection portion 63 and attached to the second tab portion 522.

[0065] Therefore, the welded portion of the second tab portion 522 and the positive electrode terminal 41 is insulated by the tab attachment portion 622. The welded portion of the positive electrode terminal 41 and the second tab portion 522 can be prevented from corrosion, i.e., galvanic corrosion.

[0066] In this way, there is no space between the tab attachment portion 622 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.

[0067] In addition, since the insulating tape 60 has the main body attachment portion 61 and the tab attachment portion 622 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 622 is separated from the main body attachment portion 61 and attached to the second tab portion 522, thereby improving workability.

[0068] In this manner, even when the insulating tape 60 is attached, the first and second extension tab portions 541, 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] FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 1 in a state where the secondary battery module is built into a case, and FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 1 in a state where the secondary battery module is built into a case.

[0070] 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 the outlet (OL) and may have a through hole (TH) on at least one side to release heat. In addition, the holder 20 may further have a corresponding hole (RH) at a portion corresponding to the through hole (TH) of the case 70.

[0071] When 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 the through hole (TH) of the case 70, and can also be discharged to the through hole (TH) through the corresponding hole (RH). Therefore, thermal runaway of the secondary battery module can be prevented.

[0072] 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]

[0073] 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 63 Connection 64 Incision 70 cases 221 Mounting groove 222 Protrusion 223 Rib 224 Opening 511 First Auxiliary Department 512 Second Auxiliary Division 521 First tab part 522 Second tab part 531 First Neck 532 Second neck 541 First extension tab portion 542 Second extension tab part 621 Extension attachment part 622 Tab attachment part C11 11th connection C12 12th connection C13 13th Connection C21 21st Connection C22 22nd Connection C23 23rd Connection CL cutting line H-bond hole L1 T-shaped boundary line L2 Curved boundary line OL outlet R1 1st column R2 Second column RH compatible hole TH through hole

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; An extension portion having a width and extending long from the main body portion; a neck portion bent downward from the extension portion and disposed inside the opening of the holder; a tab portion bent at the neck portion and connected to the electrode terminal, The extension and the opening are The secondary battery module has a discharge port formed above the electrode terminal.

2. The insulating tape is a body attachment portion attached to the body portion; an extension attachment portion connected to the main body attachment portion and attached to the extension portion; The secondary battery module of claim 1 , further comprising: a tab attachment portion separated from the body attachment portion and the extension attachment portion along a cutting line and attached to the tab portion and the electrode terminal.

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

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

5. The extension portion is Two slits are formed on either side of the opening of the slit in the extension direction. The neck portion is The two are connected to form a pair, The tab portion is The secondary battery module according to claim 1 , wherein the secondary battery module is formed in a pair and connected to the neck portion.

6. The holder further includes a case for receiving the holder. The case is The secondary battery module according to claim 1 , further comprising a through hole on at least one side connected to the outlet port for dissipating heat.

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