Tab, battery module, and battery pack

Abstract

To provide a tab, a battery module, and a battery pack that prevent re-contact of a fused portion even when an overcurrent flows and the fuse is fused.SOLUTION: A tab of the present disclosure includes: a first tab part 10; a second tab part 20; a connection part 30 that connects the first tab part 10 and the second tab part 20; and a heat shrinkable member 40 that covers the connection part 30, at least a part of the first tab part 10, and at least a part of the second tab part 20. When the direction in which the first tab part 10 and the second tab part 20 are arranged is a X direction, a thickness direction of the first tab part 10 and the second tab part 20 is a Z direction, and a direction perpendicular to each of the X direction and the Z direction is a Y direction, a dimension 30s of the connection part 30 in the Y direction is smaller than a dimension of the first tab part 10 in the Y direction and a dimension of the second tab part 20 in the Y direction. The first tab part 10 and the second tab part 20 are non-linearly symmetric with respect to a virtual line Ly extending in the Y direction through the center of the connection part 30 as viewed along the Z direction, and / or are non-linearly symmetric with respect to a virtual line Lz extending in the Z direction through the center of the connection part 30 as viewed along the Y direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a tab, a battery module, and a battery pack.

Background Art

[0002] Patent Document 1 discloses a bus bar with a fuse function that is a rectangular flat plate made of a conductive material, with a concave shape in the center with respect to the plate thickness and a constricted portion that is constricted with respect to the plane, and a heat-resistant heat shrinkable tube covering the periphery thereof.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The bus bar with a fuse function described in Patent Document 1 is line-symmetric in plan view with respect to a virtual line extending in the long side direction (and short side direction) of the rectangular flat plate passing through the center of the constricted portion, and is line-symmetric in side view with respect to a virtual line extending in the thickness direction of the rectangular shape passing through the center of the constricted portion.

[0005] When an abnormal large current flows through the bus bar and the constricted portion is blown, although the generated metal vapor and molten metal are prevented from scattering by the heat-resistant heat shrinkable tube, external force application due to the blow and contact of the molten metal in the constricted portion occur inside the heat-resistant heat shrinkable tube, and there is a risk that the blown constricted portion will re-contact, and there is room for improvement regarding the re-contact of the blown portion.

[0006] The present disclosure has been made in view of such a point. That is, the main object of the present disclosure is to provide a tab, a battery module, and a battery pack that prevent re-contact of the blown portion even when an overcurrent flows and the fuse blows.

Means for Solving the Problem

[0007] The tab of the present disclosure comprises a first tab portion, a second tab portion, a connecting portion connecting the first tab portion and the second tab portion, and a heat shrinkable member covering at least a part of the connecting portion, at least a part of the first tab portion, and at least a part of the second tab portion. When the direction in which the first tab portion and the second tab portion are arranged is defined as the X direction, the thickness direction of the first tab portion and the second tab portion is defined as the Z direction, and the direction perpendicular to each of the X direction and the Z direction is defined as the Y direction, the dimension of the connecting portion in the Y direction is smaller than the dimension of the first tab portion in the Y direction and the dimension of the second tab portion in the Y direction, respectively. The first tab portion and the second tab portion are non-linearly symmetric when viewed along the Z direction with respect to an imaginary line extending in the Y direction passing through the center of the connecting portion, and / or non-linearly symmetric when viewed along the Y direction with respect to an imaginary line extending in the Z direction passing through the center of the connecting portion.

[0008] The battery module of the present disclosure includes the above-described tab.

[0009] The battery pack of the present disclosure includes the above-described battery module.

Advantages of the Invention

[0010] According to the present disclosure, even if an overcurrent flows and the connecting portion connecting the first tab portion and the second tab portion is melted and broken, recontact at the melted and broken portion can be prevented.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 5

Figure 6

Figure 7A

Figure 7B

Figure 8

Figure 9A

Figure 9B

Figure 9C

Figure 10A

Figure 10B

Figure 11A

Figure 11B

Figure 12A

Figure 12B

Figure 12C

Figure 12D

Figure 12E

Figure 12F

Figure 12G

Figure 12H

Figure 12I

Figure 12J

Figure 12K

Figure 12L

[0012] Hereinafter, the tab, battery module, and battery pack according to an embodiment of the present disclosure will be described in more detail. Although the description will be made with reference to the drawings as necessary, the various elements in the drawings are merely shown schematically and exemplarily for the purpose of understanding the present disclosure, and the appearance, dimensional ratios, etc. may be different from the actual ones.

[0013] As used herein, the "Z direction" is intended to be the thickness direction of a symmetric object (e.g., a battery pack), and the drawing viewed from the Z direction is a plan view. The "Y direction" is intended to be the height direction of the battery used in the battery pack, and the drawing viewed from the Y direction is a side view. The "X direction" is intended to be a direction orthogonal to the Z direction and the Y direction. That is, the X direction, the Y direction, and the Z direction are each intended to be in an orthogonal relationship with each other. In the drawings, the X direction, the Y direction, and the Z direction are illustrated, and the direction of the arrow is intended to be the positive direction (or + direction), and the direction opposite to the direction of the arrow is intended to be the negative direction (or - direction). Also, terms such as "degree" referred to in this specification are meant to include variations of several percent, for example, ±10%.

[0014] [Battery Pack] The battery pack BP of the present disclosure will be described with reference to FIG. 1. FIG. 1 is a schematic exploded perspective view of the battery pack BP.

[0015] The battery pack BP may include a case CS and a battery module BM housed in the case CS (see FIG. 1). A detailed description of the battery module BM will be given later item by item.

[0016] The case CS may be composed of a first case CS1 and a second case CS2. And, a housing space for housing the battery module BM may be formed by the first case CS1 and the second case CS2. In the example of FIG. 1, a mode in which the housing space is formed by two cases (the first case CS1 and the second case CS2) is illustrated, but it is not limited to this mode, and it may be composed of three or more cases.

[0017] The material of the case CS may be any material, and may be a resin material (for example, plastic) or a metal material. For example, examples of the resin material include polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT), modified polyphenylene ether (m-PPE), polyamide (PA), and the like. For example, examples of the metal material include aluminum and the like. Note that from the viewpoint of more suitably accommodating the battery module BM, a material with high rigidity may be used for the case CS.

[0018] A connector CN electrically connected to the battery module BM may be provided in the case CS. In the example shown in FIG. 1, an aspect in which the connector CN is provided in the second case CS2 is shown, but the connector CN may be provided in the first case CS1. The connector CN may be a terminal for taking out electric power from the battery module BM.

[0019] [Battery module] The battery module BM of the present disclosure will be described with reference to FIG. 2. FIG. 2 is a schematic exploded perspective view of the battery module BM housed in the battery pack BP of the present disclosure.

[0020] The battery module BM of the present disclosure may include a battery CB, a battery holder HD, a tab 1, and a control board SB. Each configuration will be described in detail below.

[0021] -Battery- The battery CB is intended to be a chemical battery that mainly converts chemical energy into direct current power by a chemical reaction. The battery CB used in the battery module BM of the present disclosure is intended to be a cylindrical battery having a cylindrical axis in the ±Y direction. Note that the shape of the battery may be a shape other than a cylindrical shape (for example, an elliptical cylindrical shape, a rectangular columnar shape, or a polygonal columnar shape, etc.).

[0022] In the battery module BM of the present disclosure, two or more batteries CB may be provided. Also, each battery CB may be arranged adjacent to each other. For example, in the embodiment shown in FIG. 2, four batteries CB may be arranged adjacent to each other in the ±X direction and stacked in the +Z direction to form two rows. Note that the number of batteries and the stacking mode are not limited to the embodiment of FIG. 2.

[0023] -Battery Holder- The battery holder HD may be a member that holds and / or fixes the battery CB within the accommodation space of the case CS. In FIG. 2 showing an example, the battery holder HD is provided on the +Y direction side and the -Y direction side of the battery CB. That is, the battery holder HD fits into the battery CB so as to sandwich it from both sides in the ±Y direction, and holds and / or fixes the battery CB. Note that in the embodiment shown in FIG. 2, the battery holder HD is constituted by two members so as to sandwich the battery CB from both sides in the ±Y direction, but the battery holder HD may be constituted by three or more members. Also, the battery holder HD may be a single member made of one member, and the battery CB may be held and / or fixed by inserting the battery CB from the +Y direction or the -Y direction.

[0024] As shown in FIG. 2, the battery holder HD may be provided with an opening OP that exposes the positive and negative terminals of the battery CB. The battery CB (positive and negative terminals) may be electrically connected to the tab 1 through the opening OP.

[0025] -Tab- As shown in FIG. 2, tab 1 may be provided so as to sandwich battery CB in the ±Y direction. Tab 1 may electrically connect the positive electrode terminals PT and / or negative electrode terminals NT of adjacent batteries CB. In FIG. 2 showing an example, tab 1 may be electrically connected in parallel by electrically connecting the positive electrode terminals PT (or negative electrode terminals NT) of the batteries CB adjacent in the ±Z direction. Also, in FIG. 2 showing an example, tab 1 may be electrically connected in series by electrically connecting the positive electrode terminal PT and the negative electrode terminal NT of the batteries CB adjacent in the ±X direction. Note that a detailed description of tab 1 will be given later. As will be described later, tab 1 of the present disclosure may employ tab 1A of the first embodiment or tab 1B of the second embodiment.

[0026] -Control board- In FIG. 2 showing an example, control board SB may be disposed on the outer surface of battery holder HD. Control board SB may be provided with insertion hole IH into which tab 1 is inserted. Thereby, control board SB may receive power from battery CB via tab 1 connected through insertion hole IH. Also, the power output from battery CB via tab 1 may be controlled.

[0027] [Tab of the First Embodiment] Tab 1A of the first embodiment will be described with reference to FIGS. 3 to 9B. Tab 1A of the present embodiment includes a first tab portion 10A, a second tab portion 20A, a connection portion 30A, and a heat shrinkable member 40.

[0028] The first tab portion 10A is a portion that is electrically connected to the positive electrode terminal PT or the negative electrode terminal NT of the battery CB and may have conductivity. As used herein, "conductivity" is intended to mean that the volume resistivity is 10 5 Ω·cm or less. Also, the second tab portion 20A is a portion that is electrically connected to the control board SB and may have conductivity. The second tab portion 20A may have an insertion portion 20I that is inserted into the insertion hole IH of the control board SB described above. The insertion portion 20I extends in the +Z direction, and the insertion portion 20I and the control board SB may be electrically connected. The first tab portion 10A and the second tab portion 20A are arranged side by side in the X direction.

[0029] The connecting portion 30A is a portion that connects the first tab portion 10A and the second tab portion 20A. Also, as shown in FIG. 4A, the dimension 30L of the connecting portion 30A in the Y direction is smaller than the dimension 10L1 of the first tab portion 10A in the Y direction and the dimension 20L of the second tab portion 20A in the Y direction, respectively. According to such a connecting portion 30A, an overcurrent can flow through the connecting portion 30A to cause it to fuse and function as a fuse.

[0030] The heat-shrinkable member 40 is a member that covers at least a part of the connecting portion 30A, at least a part of the first tab portion 10A, and at least a part of the second tab portion 20A. Specifically, the heat-shrinkable member 40 is a member having a hollow cross-section when viewed along the +X direction in FIG. 4B, and at least a part of the connecting portion 30A, at least a part of the first tab portion 10A, and at least a part of the second tab portion 20A are arranged inside the hollow. According to such a covering mode of the heat-shrinkable member 40, even if an overcurrent flows and the connecting portion 30A fuses, the sparks (metal vapor and molten metal) at the time of fusing can be confined by the heat-shrinkable member.

[0031] Also, when heat caused by the overcurrent at the time of fusing is applied to the heat-shrinkable member 40, the heat-shrinkable member 40 can generate a contraction stress in the direction toward the inside of the hollow heat-shrinkable member 40 (in other words, the direction toward the first tab portion 10A, the second tab portion 20A, and the connecting portion 30A located inside the hollow of the hollow heat-shrinkable member 40. In the example of FIG. 4B, the ±Y direction and the ±Z direction). As an example of such a heat-shrinkable member 40, those made of materials such as vinyl chloride, silicone rubber, and fluorine-based polymers can be mentioned.

[0032] Here, the tab 1A of the present embodiment is, in a broad sense, non-linearly symmetric with respect to a virtual line Ly extending in the Y direction through the center C of the connection portion 30A when viewed along the Z direction, where the first tab portion 10A and the second tab portion 20A are connected. As shown in FIG. 5, when an overcurrent flows through the tab 1A and the connection portion 30A is blown, thermal contraction of the thermal contraction member 40 occurs due to the heat caused by the overcurrent. As a result, a contraction stress SS is applied in a direction in which the blown portion of the first tab portion 10A and the blown portion of the second tab portion 20A are separated, preventing re-contact between the blown portions of each other. Further, due to the contraction of the thermal contraction member 40, the blown portion of the first tab portion 10A and the blown portion of the second tab portion 20A are held in a separated state. The "center C of the connection portion 30A" as used in this specification is intended to be the intersection of a bisector (virtual line Lx) that bisects the Y-direction dimension 30L of the connection portion 30A in FIG. 4A and a bisector (virtual line Ly) that bisects the region R3 (see FIG. 4B) of the thermal contraction member 40 described later in the X direction when viewed along the Z direction.

[0033] As an embodiment of the tab 1 of the present disclosure, in the aspect shown in FIGS. 4A and 4B, the outer side (the lower side 10d in FIG. 4A) along the X direction located on one side in the Y direction of the portion covered by the thermal contraction member 40 in the first tab portion 10A may be shifted in the Y direction when viewed along the Z direction with respect to the outer side (the lower side 20d in FIG. 4A) along the X direction located on one side in the Y direction of the second tab portion 20A. Specifically, the portion covered by the thermal contraction member 40 in the first tab portion 10A may be arranged to be shifted in the -Y direction with respect to the second tab portion 20A. In this way, by shifting the first tab portion 10A in the Y direction with respect to the second tab portion 20A, re-contact between the blown portion of the first tab portion 10A and the blown portion of the second tab portion 20A can be prevented.

[0034] [Additional Configuration of the Tab of the First Embodiment] In tab 1A of the first embodiment shown in FIG. 4B, in the first tab portion 10A, the dimension 10L1 in the Y direction of the portion covered by the heat-shrinkable member 40 becomes smaller as it goes toward the connection portion 30A when viewed along the Z direction, and the second tab portion 20A may have the dimension 20L in the Y direction become smaller as it goes toward the connection portion 30A when viewed along the Z direction. Stating the above configuration from another perspective, the outer edge 10e on the connection portion 30A side of the portion covered by the heat-shrinkable member 40 in the first tab portion 10A is inclined with respect to the virtual line Ly extending in the Y direction, and the outer edge 20e on the connection portion 30A side of the second tab portion 20A may be inclined with respect to the virtual line Ly extending in the Y direction (see FIG. 4A). According to such a configuration, since the dimensional changes in the Y direction of the portion covered by the heat-shrinkable member 40 in the first tab portion 10A and the second tab portion 20A gradually become narrower, the electrical resistance value gradually increases and the connection portion 30A has a shape that is easily heated due to overcurrent. Therefore, the heat-shrinkable member can be easily shrunk. Also, since the dimensional changes in the Y direction of the first tab portion 10A and the second tab portion 20A gradually change, when inserting the heat-shrinkable member 40 into the first tab portion 10A and the second tab portion 20A during tab manufacturing, the heat-shrinkable member can be easily inserted.

[0035] Note that the modes of the first tab portion 10A and the second tab portion 20A are not limited to those shown in FIGS. 4A and 4B. For example, as shown in FIG. 6, the outer edge 10e on the connection portion 30A side of the portion covered by the heat-shrinkable member 40 in the first tab portion 10A may be along the Y direction, and the outer edge 20e on the connection portion 30A side of the second tab portion 20A may be along the Y direction. As shown in FIG. 6, when the outer edges 10e and 20e are along the Y direction, the dimensional changes in the Y direction of the first tab portion 10A and the second tab portion 20A can be made abrupt, and the current flowing through the connection portion 30A can be easily concentrated. Also, the coverage range of the heat-shrinkable member 40 can be narrowed to reduce the usage amount of the heat-shrinkable member 40.

[0036] As the minimum required covering mode of the heat-shrinkable member 40 in the tab 1A of the first embodiment, if the heat-shrinkable member 40 covers at least a part of the connection part 30A, the first tab part 10A, and the second tab part 20A, the effect of confining the sparks (metal vapor and molten metal) during fusing can be exerted by the heat-shrinkable member 40. As a more preferable covering mode of the heat-shrinkable member 40, as shown in FIG. 4B, it is preferable that the region R1 of the heat-shrinkable member 40 covering the first tab part 10A is wider than the region R3 of the heat-shrinkable member 40 covering the connection part 30A when viewed along the Z direction. Also, it is preferable that the region R2 of the heat-shrinkable member 40 covering the second tab part 20A is wider than the region R3 of the heat-shrinkable member 40 covering the connection part 30A when viewed along the Z direction. Thus, by making the region R1 of the heat-shrinkable member 40 covering the first tab part 10A (or the region R2 of the heat-shrinkable member covering the second tab part 20A) wider than the region R3 of the heat-shrinkable member covering the connection part 30A, it is possible to absorb the displacement when incorporating the heat-shrinkable member into the tab and the displacement due to vibration and impact during actual use.

[0037] Also, in the dimensional relationship between the first tab part 10A and the connection part 30A, the dimension 30L in the Y direction of the connection part 30A may be equal to or less than one-half of the dimension 20L in the Y direction of the second tab part 20 (see FIG. 4A). With such a dimensional relationship, when an overcurrent flows through the connection part 30A, the connection part can be more appropriately fused.

[0038] Further, in the dimensional relationship between the first tab portion 10A and the second tab portion 20A, the dimension 10L1 in the Y direction of the portion of the first tab portion 10A covered by the heat-shrinkable member 40 may be the same as the dimension 20L in the Y direction of the second tab portion 20A (see FIG. 4A). According to such a configuration, as shown in FIG. 5, when the connection portion 30 is melted by overcurrent and the heat-shrinkable member 40 is shrunk to hold the melted portion of the first tab portion 10A and the melted portion of the second tab portion 20A in a separated state, the first tab portion and the second tab portion can be appropriately held by the heat-shrinkable member. Specifically, when the connection portion 30A is melted, the heat-shrinkable member 40 acts in a direction in which the lower side 10d (see FIG. 5) of the first tab portion 10A and the upper side 20u (see FIG. 5) of the second tab portion 20A approach each other due to shrinkage in the ±Y direction. That is, the lower side 10d of the first tab portion 10A moves in the +Y direction, and the upper side 20u of the second tab portion 20A moves in the -Y direction. Then, the first tab portion 10A side of the connection portion 30 is held in an upwardly separated state, and the second tab portion 20A side of the connection portion 30 is held in a downwardly separated state. Further, it is not limited to the case where the dimension 10L1 in the Y direction of the portion of the first tab portion 10A covered by the heat-shrinkable member 40 is the same as the dimension 20L in the Y direction of the second tab portion 20. For example, the difference between the dimension of the first tab portion 10A in the Y direction and the dimension of the second tab portion 20A in the Y direction may be within 50% of the larger dimension of the dimension of the first tab portion 10A in the Y direction and the dimension of the second tab portion 20A in the Y direction. With such a dimension difference, it is possible to allow the first tab portion and the second tab portion to be appropriately held by the heat-shrinkable member because the shrinkage amount of the heat-shrinkable member is larger than the dimension difference.

[0039] Further, the dimension 10L2 in the Y direction of the first tab portion 10A at a position not covered by the heat-shrinkable member 40 may be equal to or greater than the dimension 20L in the Y direction of the second tab portion 20A (see FIG. 4A). If the dimension 10L2 is equal to or greater than the dimension 20L, the conductive performance of the tab can be improved. Note that the dimension 10L2 may be determined in consideration of interference with components other than the tab, material costs, and the like.

[0040] As a further additional configuration of the tab 1A of the first embodiment, the first tab portion 10A may include a covered portion 11 covered with a heat-shrinkable member 40 when viewed along the Z direction, and an uncovered portion 12 not covered with the heat-shrinkable member 40 (see FIGS. 4A and 4B). The uncovered portion 12 may be disposed at a position adjacent to the heat-shrinkable member 40 in the Y direction when the tab 1A is viewed along the Z direction. More specifically, the uncovered portion 12 may be disposed so as to be spaced apart from the covered portion 11 and adjacent to it in the Y direction. Also, the uncovered portion 12 may be provided so as to extend in the +X direction. And the heat-shrinkable member 40 may be disposed so as to be sandwiched between the covered portion 11 and the uncovered portion 12. When the uncovered portion 12 is provided in the first tab portion 10A, as shown in FIG. 5, when the connection portion 30A is blown by an overcurrent and the heat-shrinkable member 40 contracts, the rotation of the heat-shrinkable member 40 can be restricted by the uncovered portion 12. Thereby, the positional deviation due to the rotation of the tab 1A of the present embodiment can be reduced. It is desirable that the interval in the Y direction between the uncovered portion 12 and the covered portion 11 (see FIG. 5) is slightly wider than the thickness T of the heat-shrinkable member 40 (see FIG. 3). Specifically, it is more preferable that the interval between the uncovered portion 12 and the covered portion 11 is a length that is equal to or greater than the thickness of the heat-shrinkable member 40 (T or more) and equal to or less than five times the thickness of the heat-shrinkable member 40 (5T or less). This is because if the interval between the uncovered portion 12 and the covered portion 11 is greater than 5T, in the normal state of the battery pack BP, vibrations or the like may be transmitted, causing the arrangement of the heat-shrinkable member 40 to fluctuate. Also, if the interval between the uncovered portion 12 and the covered portion 11 is narrower than the thickness T of the heat-shrinkable member 40, it becomes difficult to incorporate the heat-shrinkable member 40 into the tab. Therefore, the interval between the uncovered portion 12 and the covered portion 11 may be appropriately set within the above numerical range (equal to or greater than the thickness T of the heat-shrinkable member 40 and equal to or less than 5T).

[0041] It is preferable that the length of the non-coated portion 12 in the +X direction has a lower limit length of about 2 mm. If the non-coated portion 12 is about 2 mm, the heat-shrinkable member 40 can be arranged so as to be sandwiched between the non-coated portion 12 and the coated portion 11. Further, as shown in FIG. 4B, the upper limit of the length of the non-coated portion 12 in the +X direction is preferably the length D1 along the X direction from the base position O of the non-coated portion 12 to the insertion portion 20I in a plan view. By setting the upper limit of the non-coated portion 12 to the length D1, the rotation of the heat-shrinkable member 40 can be appropriately restricted by the non-coated portion 12. Note that the insulation between the non-coated portion 12 and the second tab portion 20 may be ensured by the heat-shrinkable member 40.

[0042] As a further specific configuration of the tab 1A of the first embodiment, as shown in FIGS. 4A and 4B, the first tab portion 10A may extend in the -Y direction side with respect to the connection portion 30A when viewed along the Z direction. The second tab portion 20A may extend in the side opposite to the Y direction (+Y direction side) with respect to the connection portion 30A when viewed along the Z direction. The non-coated portion 12 may be located on the -Y direction side with respect to the connection portion 30A when viewed along the Z direction. By setting the positional relationship of the first tab portion 10A, the second tab portion 20A, and the non-coated portion 12 in this way, the heat-shrinkable member 40 can be incorporated so as to be sandwiched between the non-coated portion 12 and the coated portion 11. Further, even if vibration or the like is transmitted in the normal state of the battery pack BP, it is possible to make it difficult for the arrangement of the heat-shrinkable member 40 to change.

[0043] As a further specific configuration of the tab 1A of the first embodiment, as shown in FIGS. 4A and 4B, the second tab portion 20A and the covering portion 11 may be in a point-symmetrical relationship with respect to the center C of the connecting portion 30A when viewed along the Z direction. As used herein, "point-symmetry" means not only when two elements are in a geometrically exact point-symmetrical relationship, but also when one element is rotated 180° about the center C, the outer contour of the element overlaps the outer contour of the other element, or each side forming the outer contour is in a parallel relationship between the two elements. Specifically, in FIG. 4A, when the second tab portion 20 is rotated 180° about the center C, the outer edge 20e of the second tab portion 20 overlaps or is in a parallel relationship with the outer edge 10e of the first tab portion 10. Also, the outer side of the second tab portion 20 (the lower side 20d in FIG. 4A) overlaps or is in a parallel relationship with the outer side of the first tab portion 10 (the upper side 10u in FIG. 4A). Thus, when the second tab portion 20A and the covering portion 11 are in a point-symmetrical relationship when viewed along the Z direction, the heat-shrinkable member 40 can apply shrinkage stress evenly to the second tab portion 20A and the covering portion 11.

[0044] [Additional Aspect of Battery Module with Tab of First Embodiment] Alternatively, instead of providing the covering portion 11 and the non-covering portion 12 on the first tab portion 10A described above, the battery holder HD of the battery module BM may be provided with a function of preventing rotation. As an example, as shown in FIGS. 7A and 7B, a battery holder HD in which the tab 1A' is arranged on the outer surface (the back surface on the +Y direction side or the front surface on the -Y direction side) is adopted for the battery module BM, and the battery holder HD is arranged at a position adjacent to the first tab portion 10A in the Y direction and also at a position adjacent to the heat shrinkable member 40 in the Y direction, and a protruding portion PP protruding from the outer surface (the top surface on the +Z direction side) may be provided. In the drawings, the reference numeral of the tab without the above-described non-covering portion 12 is 1A'. By providing the protruding portion PP on the battery holder HD, when the connection portion 30A is melted by overcurrent and the heat shrinkable member 40 contracts, the rotation of the heat shrinkable member 40 can be restricted by the protruding portion PP. Thereby, the displacement due to the rotation of the tab 1A' of the present embodiment can be reduced. Note that the protruding portion PP is not limited to the circular boss shape as viewed along the Z direction as shown in FIGS. 7A and 7B, and may be a rectangular rib shape as viewed along the Z direction as shown in FIG. 8.

[0045] As a preferred embodiment of the protruding portion PP provided in the battery holder HD, as shown in FIGS. 9A to 9C, the protruding portion PP has an extending portion EP that extends in the X direction so as to have an L shape when viewed from the Y direction, and at least a part of the extending portion EP may be covered with the heat shrinkable member 40. By adopting such a mode in which the extending portion EP is provided on the protruding portion PP, when an overcurrent flows through the connecting portion 30A and a fuse is blown (see FIG. 9C), heat shrinkage occurs in the heat shrinkable member 40 due to the heat caused by the overcurrent. However, the heat shrinkage of the heat shrinkable member 40 in contact with the extending portion EP is restricted from shrinking inward of the extending portion EP. Then, the heat shrinkable member 40 not in contact with the extending portion EP shrinks so as to contact the first tab portion 10A and the second tab portion 20B. Therefore, re-contact between the fuse locations of the first tab portion 10A and the second tab portion 20A can be prevented. Further, although stress acts on the first tab portion 10A and the second tab portion 20A in the rotating direction due to the heat shrinkage of the heat shrinkable member 40, if the extending portion EP is provided, the rotation is restricted by the contact with the extending portion EP even if the first tab portion 10A and the second tab portion 20A rotate. Therefore, even if shrinkage stress acts on the first tab portion 10A and the second tab portion 20A, re-contact between the fuse locations of the first tab portion 10A and the second tab portion 20A can be prevented.

[0046] As described above, according to the tab of the first embodiment, the battery module including the tab, and the battery pack including the battery module, even if an overcurrent flows and the connecting portion connecting the first tab portion and the second tab portion is blown, re-contact of the blown location can be prevented.

[0047] [Tab of the Second Embodiment] Next, the tab 1B of the second embodiment will be described with reference to FIGS. 10A to 12L. In describing the tab 1B of the second embodiment, descriptions of points common to the description in the item of [Tab of the First Embodiment] described above will be omitted as appropriate. That is, the following description will focus on the points different from the description in the item of [Tab of the First Embodiment] described above.

[0048] In a broad sense, the tab 1B of the present embodiment is non-linearly symmetric when viewed along the Y direction with respect to the virtual line Lz along which the first tab portion 10B and the second tab portion 20B extend parallel to the Z direction through the center of the connection portion 30B (see Fig. 11A). Therefore, as shown in Fig. 11B, when an overcurrent flows through the tab 1B and the connection portion 30B is blown, thermal contraction of the thermal contraction member 40 occurs due to the heat caused by the overcurrent. As a result, a contraction stress is applied in a direction in which the blown portion of the first tab portion 10B and the blown portion of the second tab portion 20B move apart, preventing re-contact between the blown portions of each other. Furthermore, the blown portion of the first tab portion 10B and the blown portion of the second tab portion 20B are held in a separated state by the contraction of the thermal contraction member 40.

[0049] As an embodiment of the tab 1B of the present embodiment, in the aspect shown in Figs. 10A to 11A, the first tab portion 10B may include a first protrusion 10p protruding in the -Z direction, and the second tab portion 20B may include a second protrusion 20p protruding on the side opposite to the first protrusion 10p. Specifically, the first protrusion 10p provided on the first tab portion 10B may protrude in the -Z direction (Figs. 10A to 11A), and the second protrusion 20p provided on the second tab portion 20B may protrude in the +Z direction. In this way, since the first protrusion 10p provided on the first tab portion 10B and the second protrusion 20p provided on the second tab portion 20B protrude on opposite sides of each other, as shown in Fig. 11B, re-contact between the blown portion of the first tab portion 10B and the blown portion of the second tab portion 20B can be prevented when viewed along the Y direction.

[0050] [Additional Configuration of the Tab in the Second Embodiment] As a covering mode of the thermal contraction member in the tab 1 of the second embodiment, as shown in Figs. 10A to 11A, the thermal contraction member 40 may cover the first protrusion 10p and the second protrusion 20p. According to such a configuration, as shown in Fig. 11B, when thermal contraction occurs in the thermal contraction member 40, thermal contraction occurs along the first protrusion 10p and the second protrusion 20p covered by the thermal contraction member 40. Therefore, re-contact between the blown portion of the first tab portion 10 and the blown portion of the second tab portion 20 can be prevented when viewed along the Y direction.

[0051] Further, as a preferred embodiment of the first protrusion 10p and the second protrusion 20p, the first protrusion 10p may be provided across the entire Y direction, and the second protrusion 20p may be provided across the entire Y direction (see FIGS. 10A to 10B). According to such a configuration, since the areas of the first protrusion 10p and the second protrusion 20p covered by the heat shrinkable member 40 extend across the entire Y direction, it is possible to appropriately prevent the re - contact between the welded portion of the first tab portion and the welded portion of the second tab portion when viewed along the Y direction.

[0052] Further, as a more preferred embodiment of the first protrusion 10p and the second protrusion 20p, as shown in FIG. 10B, the dimension 10p1 of the first protrusion 10p in the Y direction may be equal to or greater than the dimension 31L of the connecting portion 30B in the Y direction, and the dimension 20p1 of the second protrusion 20p in the Y direction may be equal to or greater than the dimension 31L of the connecting portion 30B in the Y direction. According to such a configuration, the dimensions 10p1 of the first protrusion 10p and 20p1 of the second protrusion 20p can be made appropriate dimensions for preventing the re - contact of the welded portion.

[0053] [Modification Example of the Tab in the Second Embodiment] Next, a modification example of the tab in the second embodiment will be described with reference to FIGS. 12A to 12L. In describing the modification example of the tab in the second embodiment, descriptions of points common to the description in the section of [Tab in the Second Embodiment] will be omitted as appropriate. That is, the description will focus on the points different from the description in the section of [Tab in the Second Embodiment]. In FIGS. 12A to 12L, the illustration of the heat shrinkable member is omitted.

[0054] <<Modification Example Regarding the Shapes of the First Protrusion and the Second Protrusion>> First, a modification example regarding the shapes of the first protrusion 10p and the second protrusion 20p of the tab 1B in the second embodiment will be described with reference to FIGS. 12A to 12C.

[0055] - Modification Example 1 - In Modification 1, as shown in FIG. 12A, the first tab portion 10B may have a hole H formed in the center, and a first protrusion 10p may be provided so as to extend in the -Z direction at the edge of the hole H on the connection portion 30B side. Similarly, the second tab portion 20B may also have a hole H formed in the center, and a second protrusion 20p may be provided so as to extend in the +Z direction at the edge of the hole H on the connection portion 30B side. The dimensions of the first protrusion 10p and the second protrusion 20p in the Y direction may be substantially the same as the dimensions of the connection portion 30B in the Y direction. Even in the aspect of Modification 1, it is possible to appropriately prevent the re-contact between the cut portion of the first tab portion and the cut portion of the second tab portion when viewed along the Y direction.

[0056] -Modification 2- In Modification 2, as shown in FIG. 12B, the first protrusion 10p protruding in the -Z direction may be provided on both side surfaces of the first tab portion 10B in the ±Y directions, and the second protrusion 20p protruding in the +Z direction may be provided on both side surfaces of the second tab portion 20 in the ±Y directions. Further, the first protrusion 10p and the second protrusion 20p may be aligned with each other in the X direction. According to the aspect of Modification 2, in addition to appropriately preventing the re-contact between the cut portion of the first tab portion 10B and the cut portion of the second tab portion 20B when viewed along the Y direction, since the first protrusion 10p and the second protrusion 20p are aligned in the X direction, it is also possible to prevent the displacement between the first tab portion and the second tab portion after cutting.

[0057] -Modification 3- In Modification 3, as shown in FIG. 12C, both end portions of the first tab portion 10B and the second tab portion 20B in the Y direction may be connected by the connection portion 30B. And the first protrusion 10p extending in the -Z direction and the second protrusion 20p extending in the +Z direction may be arranged inside the pair of connection portions 30B. In other words, the first protrusion 10p and the second protrusion 20p may be arranged so as to overlap the connection portion 30B when viewed in the Y direction. According to such a configuration, it is possible to appropriately prevent the re-contact between the first tab portion and the second tab portion near the center of the tab.

[0058] <<Modifications to the Shape of the Connection Portion>> Next, a modification of the shape of the connection portion 30B of the tab 1B in the second embodiment will be described with reference to FIGS. 12D to 12L. In FIGS. 12D to 12L, illustration of the first protrusion and the second protrusion is omitted.

[0059] - Modification 4 - In Modification 4, as shown in FIG. 12D, the outer sides 31s located in the ±Y direction with respect to the center C of the connection portion 30B may extend along the X direction. By extending the outer sides 31s of the connection portion 30B along the X direction to a desired length in this way, the current value that is blown by overcurrent can be adjusted in proportion to the length of the outer sides 31s.

[0060] - Modification 5 - In Modification 5, as shown in FIG. 12E, the outer sides 32s located in the ±Y direction with respect to the center C of the connection portion 30B may be arc-shaped. By making the outer sides 32s of the connection portion 30 arc-shaped in this way, disconnection of the connection portion 30 due to an external force can be appropriately prevented.

[0061] - Modification 6 - In Modification 6, as shown in FIG. 12F, the outer sides 33s located in the ±Y direction with respect to the center C of the connection portion 30B may be V-shaped. By making the outer sides 33s of the connection portion 30B V-shaped in this way, even a relatively small overcurrent can be blown.

[0062] - Modification 7 - In Modification 7, as shown in FIG. 12G, an angle θ1 formed by the outer side 11s located on one side in the Y direction of the portion covered by the heat shrinkable member in the first tab portion 10B and the outer side 34s located in the Y direction with respect to the center C of the connection portion 30, and an angle θ2 formed by the outer side 21s located on one side in the Y direction of the portion covered by the heat shrinkable member in the second tab portion 20B and the outer side 34s located in the Y direction with respect to the center C of the connection portion 30B may be different from each other. By setting such an angular relationship, the first tab portion 10B and the second tab portion 20B become asymmetric with respect to the center C of the connection portion 30B, and the amount of heat generated by overcurrent can be controlled.

[0063] - Variation Example 8 - In Variation Example 8, as shown in Fig. 12H, the position of the connection part 30B may be displaced from the center of the tab in the Y direction. By displacing the position of the connection part 30B in the Y direction in this way, the fusing position of the connection part 30B caused by overcurrent can be set to a desired position. The angle θ3 composed of the outer side 12s located on the +Y direction side of the portion covered by the heat shrinkable member in the first tab part 10B and the outer side 35s located in the +Y direction with respect to the center C of the connection part 30B, and the angle θ4 composed of the outer side 13s located on the -Y direction side of the portion covered by the heat shrinkable member in the first tab part 10B and the outer side 36s located in the -Y direction with respect to the center C of the connection part 30B may be different from each other. Even with such an angular relationship, the first tab part 10B and the second tab part 20B are asymmetric with respect to the center C of the connection part 30B, and the amount of heat generated due to overcurrent can be controlled.

[0064] - Variation Example 9 - In Variation Example 9, as shown in Fig. 12I, the connection part 30B may be continuously provided along the X direction from the outer edge of the first tab part 10B and / or the outer edge of the second tab part 20B. According to the position of the connection part 30B like this, the fusing position of the connection part caused by overcurrent can be brought closer to the outer peripheral edge side. In the Variation Example 9 shown in Fig. 12I, a mode in which the connection part 30B is continuous along the X direction from the outer edge on one side is shown, but as shown in Fig. 12J, a mode in which the connection part 30B is continuous along the X direction from the outer edges on both sides may also be used. According to such a configuration, compared with the mode shown in Fig. 12I, the twisting of the first tab part 10B and the second tab part 20B can be effectively prevented. Further, with respect to the connection part 30B shown in Fig. 12I or Fig. 12J, as shown in Fig. 12K or Fig. 12L, the outer side 37s of the connection part 30 may be formed in an arc shape in order to appropriately prevent the cutting of the connection part 30 by an external force.

[0065] As described above, according to the tab of the second embodiment, the battery module including the tab, and the battery pack including the battery module, even if an overcurrent flows and the connection portion connecting the first tab portion and the second tab portion is blown, recontact of the blown portion can be prevented.

[0066] It should be noted that the embodiments disclosed this time are illustrative in all respects and are not a basis for restrictive interpretation. Therefore, the technical scope of the present disclosure is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. Further, the technical scope of the present disclosure includes all modifications within the meaning and scope equivalent to the claims. Specifically, the "tab in which the first tab portion 10 and the second tab portion 20 are non-linearly symmetric when viewed along the Z direction with respect to the virtual line Ly extending in the Y direction through the center C of the connection portion 30" of the first embodiment and the "tab in which the first tab portion 10 and the second tab portion 20 are non-linearly symmetric when viewed along the Y direction with respect to the virtual line Lz extending in the Z direction through the center C of the connection portion 30" of the second embodiment may be combined. In such a tab configuration, even if an overcurrent flows and the connection portion is blown, recontact of the blown portion can be prevented when viewed from the Z direction or the Y direction.

[0067] Aspects of the tab, battery module, and battery pack of the present disclosure are as follows. <1> A first tab portion, a second tab portion, a connection portion connecting the first tab portion and the second tab portion, and a heat-shrinkable member covering at least a part of the connection portion, at least a part of the first tab portion, and at least a part of the second tab portion. The direction in which the first tab portion and the second tab portion are arranged is the X direction, the thickness direction of the first tab portion and the second tab portion is the Z direction, when the direction perpendicular to each of the X direction and the Z direction is the Y direction, the dimension of the connection portion in the Y direction is smaller than the dimension of the first tab portion in the Y direction and the dimension of the second tab portion in the Y direction, respectively. The first tab portion and the second tab portion are tabs that are non-linearly symmetric when viewed along the Z direction with respect to a virtual line extending in the Y direction passing through the center of the connection portion, and / or non-linearly symmetric when viewed along the Y direction with respect to a virtual line extending in the Z direction passing through the center of the connection portion. <2>The outer side along the X direction located on one side in the Y direction of the portion covered by the heat shrinkable member in the first tab portion is shifted in the Y direction when viewed along the Z direction with respect to the outer side along the X direction located on the one side in the Y direction of the second tab portion. The tab according to <1>. <3>The portion covered by the heat shrinkable member in the first tab portion has a decreasing dimension in the Y direction when viewed along the Z direction as it approaches the connection portion. The second tab portion has a decreasing dimension in the Y direction when viewed along the Z direction as it approaches the connection portion. The tab according to <1> or <2>. <4>The outer edge on the connection portion side of the portion covered by the heat shrinkable member in the first tab portion is along the Y direction. The outer edge on the connection portion side of the second tab portion is along the Y direction. The tab according to any one of <1> to <3>. <5>When viewed along the Z direction, the area of the heat shrinkable member covering the first tab portion is wider than the area of the heat shrinkable member covering the connection portion. When viewed along the Z direction, the area of the heat shrinkable member covering the second tab portion is wider than the area of the heat shrinkable member covering the connection portion. The tab according to any one of <1> to <4>. <6>The dimension of the connection portion in the Y direction is equal to or less than one-half of the dimension of the first tab portion in the Y direction. The tab according to any one of <1> to <5>. <7>The dimension of the portion not covered by the heat shrinkable member in the first tab portion in the Y direction is larger than the dimension of the second tab portion in the Y direction. The tab according to any one of <1> to <6>. <8>The dimension in the Y direction of the portion of the first tab portion covered by the heat shrinkable member is the same as the dimension in the Y direction of the second tab portion, or the difference between the dimension in the Y direction of the portion of the first tab portion covered by the heat shrinkable member and the dimension in the Y direction of the second tab portion is within 50% of the larger dimension among the dimension in the Y direction of the first tab portion and the dimension in the Y direction of the second tab portion. The tab according to any one of <1> to <6>. <9>The first tab portion includes a covered portion covered by the heat shrinkable member when viewed along the Z direction, and an uncovered portion not covered by the heat shrinkable member. The uncovered portion is arranged at a position adjacent to the heat shrinkable member in the Y direction when viewed along the Z direction. The tab according to any one of <1> to <8>. <10>The first tab portion extends toward the Y direction side with respect to the connecting portion when viewed along the Z direction. <11>The second tab portion extends toward the side opposite to the Y direction with respect to the connecting portion when viewed along the Z direction. The uncovered portion is located on the Y direction side with respect to the connecting portion when viewed along the Z direction. The tab according to <9>. <12>The second tab portion and the covered portion are in a point-symmetrical relationship with respect to the center of the connecting portion when viewed along the Z direction. The tab according to <10>. <13>The first tab portion includes a first protrusion protruding in the Z direction. <14>The second tab portion includes a second protrusion protruding on the side opposite to the first protrusion. The tab according to any one of <1> to <11>. <15>The heat shrinkable member covers the first protrusion and the second protrusion. The tab according to <12>. <16>The first protrusion is provided over the entire Y direction. <17>The second protrusion is provided over the entire Y direction. The tab according to <12> or <13>. <18>The dimension in the Y direction of the first protrusion is equal to or greater than the dimension in the Y direction of the connecting portion. The dimension of the second protrusion in the Y direction is equal to or greater than the dimension of the connecting portion in the Y direction. The tab according to any one of <12> to <14>. <16>A plurality of the first protrusions are provided on the first tab portion, and are aligned with the second protrusions of the second tab portion in the X direction. A plurality of the second protrusions are provided on the second tab portion, and are aligned with the first protrusions of the first tab portion in the X direction. The tab according to any one of <12> to <15>. <17>The outer side located in the Y direction with respect to the center of the connecting portion is arc-shaped. The tab according to any one of <12> to <16>. <18>The angle formed by the outer side located on one side in the Y direction of the portion covered by the heat shrinkable member in the first tab portion and the outer side located in the Y direction with respect to the center of the connecting portion, and the angle formed by the outer side located on one side in the Y direction of the portion covered by the heat shrinkable member in the second tab portion and the outer side located in the Y direction with respect to the center of the connecting portion are different from each other. The tab according to any one of <12> to <17>. <19>The position of the connecting portion is offset from the center of the tab in the Y direction. The tab according to any one of <12> to <18>. <20>The connecting portion is continuously provided along the Y direction from the outer edge of the first tab portion and / or the outer edge of the second tab portion. The tab according to any one of <12> to <19>. <21>The tab according to any one of <1> to <11>, A battery cell electrically connected to the tab, A battery holder that houses the battery cell and has the tab disposed on the outer surface. In the battery holder, a battery module is disposed at a position adjacent to the first tab portion in the Y direction and at a position adjacent to the heat shrinkable member in the Y direction, and has a protruding portion protruding from the outer surface. <22>The protruding portion has an extending portion extending in the Y direction so as to have an L shape in a side view. The battery module according to <21>, wherein at least a part of the extending portion is covered with the heat-shrinkable member. <23>A battery module including the tab according to any one of <1> to <18>. <24>A battery pack including the battery module according to <23>.

Industrial Applicability

[0068] The present disclosure can be suitably used as a tab, a battery module, and a battery pack that prevent re-contact at the fuse melting location even when an overcurrent flows and the fuse blows.

Description of Symbols

[0069] 1, 1A, 1A’, 1B tabs 10A, 10B First tab portion 10L1 Y-direction dimension of the first tab portion covered with the heat-shrinkable member 10L2 Y-direction dimension of the first tab portion not covered with the heat-shrinkable member 10e Outer edge of the first tab portion 10u Upper side of the first tab portion 10d Lower side of the second tab portion 11s~13s Outer sides of the first tab portion 10p First protrusion 10p1 Y-direction dimension of the first protrusion 11 Covered portion 12 Uncovered portion 20A, 20B Second tab portion 20L Y-direction dimension of the second tab portion 20e Outer edge of the second tab portion 20u Upper side of the second tab portion 20d Lower side of the second tab portion 20I Insertion portion 21s Outer side of the second tab portion 20p Second protrusion 20p1 Y-direction dimension of the second protrusion 30A, 30B Connection portion 30L, 31L Y-direction dimensions of the connection portion 30s~37s Outer sides of the connection portion 40 Heat shrinkable member Lx Virtual line along the X direction Ly Virtual line along the Y direction C Center of the connection part BP Battery pack BM Battery module CB Battery PT Positive terminal NT Negative terminal HD Battery holder O Position of the base of the non-contact part D1 Upper limit length of the non-coated part OP Opening CS Case SB Control board IH Insertion hole R1 Region of the heat shrinkable member covering the first tab part R2 Region of the heat shrinkable member covering the second tab part R3 Region of the heat shrinkable member covering the connection part PP Protruding part

Claims

1. a first tab portion, a second tab portion, a connecting portion connecting the first tab portion and the second tab portion, a heat-shrinkable member covering at least a part of the connecting portion, at least a part of the first tab portion, and at least a part of the second tab portion, wherein a direction in which the first tab portion and the second tab portion are arranged is an X direction, a thickness direction of the first tab portion and the second tab portion is a Z direction, when a direction perpendicular to each of the X direction and the Z direction is a Y direction, a dimension of the connecting portion in the Y direction is smaller than each of a dimension of the first tab portion in the Y direction and a dimension of the second tab portion in the Y direction, the first tab portion and the second tab portion are non-linearly symmetric when viewed along the Z direction with respect to a virtual line extending in the Y direction passing through the center of the connecting portion, and / or non-linearly symmetric when viewed along the Y direction with respect to a virtual line extending in the Z direction passing through the center of the connecting portion, a tab.

2. an outer side along the X direction located on one side in the Y direction of a portion of the first tab portion covered by the heat-shrinkable member is displaced in the Y direction when viewed along the Z direction with respect to an outer side along the X direction located on the one side in the Y direction of the second tab portion, the tab according to claim 1.

3. in the first tab portion, a dimension in the Y direction becomes smaller as it goes toward the connecting portion when viewed along the Z direction, in the second tab portion, a dimension in the Y direction becomes smaller as it goes toward the connecting portion when viewed along the Z direction, the tab according to claim 2.

4. an outer edge on the connecting portion side of a portion of the first tab portion covered by the heat-shrinkable member is along the Y direction, an outer edge on the connecting portion side of the second tab portion is along the Y direction, the tab according to claim 2.

5. when viewed along the Z direction, a region of the heat-shrinkable member covering the first tab portion is wider than a region of the heat-shrinkable member covering the connecting portion, when viewed along the Z direction, a region of the heat-shrinkable member covering the second tab portion is wider than a region of the heat-shrinkable member covering the connecting portion, the tab according to claim 2.

6. a dimension of the connecting portion in the Y direction is equal to or less than one-half of a dimension of the first tab portion in the Y direction, the tab according to claim 2.

7. The dimension in the Y direction of the portion of the first tab portion not covered by the heat-shrinkable member is larger than the dimension in the Y direction of the second tab portion. The tab according to claim 2.

8. The dimension in the Y direction of the portion of the first tab portion covered by the heat-shrinkable member is the same as the dimension in the Y direction of the second tab portion, or the difference between the dimension in the Y direction of the portion of the first tab portion covered by the heat-shrinkable member and the dimension in the Y direction of the second tab portion is within 50% of the larger dimension among the dimension in the Y direction of the first tab portion and the dimension in the Y direction of the second tab portion. The tab according to claim 2.

9. The first tab portion includes a covered portion covered by the heat-shrinkable member when viewed along the Z direction, and an uncovered portion not covered by the heat-shrinkable member. The uncovered portion is arranged at a position adjacent to the heat-shrinkable member in the Y direction when viewed along the Z direction. The tab according to claim 2.

10. The first tab portion extends to the Y direction side with respect to the connecting portion when viewed along the Z direction. The second tab portion extends to the side opposite to the Y direction with respect to the connecting portion when viewed along the Z direction. The uncovered portion is located on the Y direction side with respect to the connecting portion when viewed along the Z direction. The tab according to claim 9.

11. The second tab portion and the covered portion are in a point-symmetrical relationship with respect to the center of the connecting portion when viewed along the Z direction. The tab according to claim 10.

12. The first tab portion includes a first protrusion protruding in the Z direction. The second tab portion includes a second protrusion protruding on the side opposite to the first protrusion. The tab according to claim 1.

13. The heat-shrinkable member covers the first protrusion and the second protrusion. The tab according to claim 12.

14. The first protrusion is provided over the entire Y direction. The second protrusion is provided over the entire Y direction. The tab according to claim 12.

15. The dimension in the Y direction of the first protrusion is equal to or greater than the dimension in the Y direction of the connecting portion. The dimension in the Y direction of the second protrusion is equal to or greater than the dimension in the Y direction of the connecting portion. The tab according to claim 12.

16. A plurality of the first protrusions are provided on the first tab portion, and are aligned with the second protrusion of the second tab portion in the X direction. The second protrusions are provided in plurality on the second tab portion and are aligned with the first protrusions of the first tab portion in the X direction. The tab according to claim 12.

17. The outer side located in the Y direction with respect to the center of the connecting portion is arc-shaped. The tab according to claim 12.

18. The angle formed by the outer side located on one side in the Y direction of the portion covered by the heat shrinkable member in the first tab portion and the outer side located in the Y direction with respect to the center of the connecting portion, and the angle formed by the outer side located on one side in the Y direction of the portion covered by the heat shrinkable member in the second tab portion and the outer side located in the Y direction with respect to the center of the connecting portion are different from each other. The tab according to claim 12.

19. The position of the connecting portion is displaced from the center in the Y direction of the tab. The tab according to claim 12.

20. The connecting portion is continuously provided along the Y direction from the outer edge of the first tab portion and / or the outer edge of the second tab portion. The tab according to claim 12.

21. The tab according to claim 2, a battery cell electrically connected to the tab, and a battery holder for housing the battery cell. In the battery holder, there is a battery module disposed at a position adjacent to the first tab portion in the Y direction and disposed at a position adjacent to the heat shrinkable member in the Y direction, and having a protruding portion protruding from the outer surface.

22. The protruding portion has an extending portion extending in the X direction so as to be L-shaped when viewed from the Y direction, and at least a part of the extending portion is covered by the heat shrinkable member. The battery module according to claim 21.

23. A battery module comprising the tab according to claim 2 or 12.

24. A battery pack comprising the battery module according to claim 23.

Images