JP2021052015A - battery - Google Patents

Abstract

To provide a battery with a novel configuration which is improved to cause less inconvenience.SOLUTION: A battery in an embodiment comprises, for example, a housing, a penetration part, an external connection terminal, a recess, a seal member, and an insulation member. The housing houses an electrode body. The penetration part is provided on the housing and penetrates the housing from the outside to the inside. The external connection terminal is inserted into the penetration part so as to be electrically connected to the electrode body. On an outer surface of the housing, the recess is formed further on the outer side than an outer edge of the external connection terminal. The seal member is interposed between the external connection terminal and an inner peripheral surface of the penetration part in a compressed state around the entire periphery of the inner peripheral surface. The insulation member has: a contact part which comes into contact with an end of the seal member; and a protrusion part which is spaced away from the contact part and protrudes into the recess.SELECTED DRAWING: Figure 2

Description

Embodiments of the present invention relate to batteries.

Conventionally, a housing including a recess provided on the surface side and a wall portion having a through hole penetrating the bottom of the recess, an external connection terminal inserted into the through hole, an external connection terminal, and a through hole. A battery including a seal member interposed between the two, and an insulating member interposed between the external connection terminal and the wall portion is known.

Japanese Unexamined Patent Publication No. 2008-305644

In this type of battery, for example, it is preferable to obtain a new configuration with less inconvenience and improved.

The battery of the embodiment includes, for example, a housing, a penetrating portion, an external connection terminal, a recess, a sealing member, and an insulating member. The housing contains an electrode body. The penetrating portion is provided in the housing and penetrates the outside and the inside of the housing. The external connection terminal is inserted into the penetrating portion and is electrically connected to the electrode body. The recess is the outer surface of the housing and is formed outside the outer edge of the external connection terminal. The seal member is interposed between the external connection terminal and the inner peripheral surface of the penetrating portion in a compressed state over the entire circumference of the inner peripheral surface. The insulating member has a contact portion that comes into contact with the end portion of the seal member, and a protrusion portion that is separated from the contact portion and protrudes into the recess.

FIG. 1 is an exemplary and schematic exploded perspective view of the battery of the first embodiment. FIG. 2 is an exemplary and schematic cross-sectional view of a portion of the battery of the first embodiment. FIG. 3 is an exemplary and schematic cross-sectional view of the first wall portion of the battery of the first embodiment. FIG. 4 is an exemplary and schematic plan view of the first wall portion of the battery of the first embodiment. FIG. 5 is an exemplary and schematic plan view of the first wall portion of the battery of the first modification of the first embodiment. FIG. 6 is an exemplary and schematic plan view of the first wall portion of the battery of the second modification of the first embodiment.

Hereinafter, exemplary embodiments of the present invention will be disclosed. The configurations of the embodiments shown below, as well as the actions and results (effects) brought about by the configurations, are examples.

Also, the plurality of embodiments disclosed below include similar components. Therefore, in the following, common reference numerals will be given to these similar components, and duplicate explanations will be omitted. In each of the following figures, the direction is defined for convenience. The X direction is along the thickness direction of the battery 1 and along the short side direction of the wall portion 20f (first wall portion). The Y direction is along the width direction of the battery 1 and along the longitudinal direction of the wall portion 20f. The Z direction is along the height direction of the battery 1 and along the thickness direction of the wall portion 20f. The X, Y, and Z directions are orthogonal to each other.

<First Embodiment>
As shown in FIGS. 1 and 2, the battery 1 is configured as, for example, a secondary battery (storage battery, rechargeable battery), and includes a housing 2, an electrode body 3, a conductive member 4, and a seal member 5. (See FIG. 2), an insulating member 6, and an external connection terminal 7. The battery 1 may be referred to as a cell, a battery cell, a can cell, or the like, and the electrode body 3 may also be referred to as an electrode group, a power storage unit, a coil unit, a charge / discharge unit, or the like. Further, the conductive member 4 can also be referred to as a lead member, a connecting member, a terminal member, or the like. In FIG. 2, the electrode body 3 is not shown for convenience.

The battery 1 may be composed of, for example, a lithium ion secondary battery or the like. The battery 1 may be another secondary battery such as a nickel hydrogen battery, a nickel cadmium battery, or a lead storage battery. A lithium ion secondary battery is a type of non-aqueous electrolyte secondary battery, and lithium ions in the electrolyte are responsible for electrical conduction. Examples of the positive electrode material include lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium manganese cobalt composite oxide, spinel type lithium manganese nickel composite oxide, and olivine. A lithium phosphorus oxide having a structure or the like is used, and as the negative electrode material, for example, an oxide-based material such as lithium titanate (LTO), an oxide material such as a niobium composite oxide, or the like is used. Further, as the electrolyte (for example, the electrolytic solution), a lithium salt such as a fluorine-based complex salt (for example, LiBF4, LiPF6) is blended, for example, ethylene carbonate, propylene carbonate, diethyl carbonate, ethylmethyl carbonate, dimethyl carbonate and the like. Organic solvents and the like are used alone or in admixture.

As shown in FIG. 1, the housing 2 is formed in a flat rectangular parallelepiped shape thin in the X direction. The housing 2 has, for example, a plurality of wall portions 20a to 20f. Both the wall portion 20a and the wall portion 20c extend along a direction (YZ plane) orthogonal to the X direction, and are provided parallel to each other at intervals in the X direction. Further, both the wall portion 20b and the wall portion 20d extend along a direction (XZ plane) orthogonal to the Y direction, and are provided in parallel with each other at intervals in the Y direction. The wall portions 20a to 20d may be referred to as a side wall portion, a peripheral wall portion, or the like.

Further, both the wall portion 20e and the wall portion 20f extend along a direction (XY plane) orthogonal to the Z direction, and are provided in parallel with each other at intervals in the Z direction. The wall portion 20e may be referred to as a bottom wall portion, a lower wall portion, or the like, and the wall portion 20f may be referred to as a top wall portion, an upper wall portion, or the like. The wall portion 20f is an example of the first wall portion.

Further, the housing 2 is configured by combining a plurality of parts (divided bodies). Specifically, the housing 2 has, for example, a case 21 and a lid 22. The case 21 has at least wall portions 20a to 20e. The case 21 is provided with a housing portion 20r surrounded by wall portions 20a to 20e and opened upward (Z direction). The accommodating portion 20r may also be referred to as an opening, a recess, a chamber, or the like. An insulating layer such as an insulating sheet that insulates the case 21 and the conductive member 4 may be provided on the inner surface 20i of the wall portions 20a to 20e.

Further, the lid 22 has at least a wall portion 20f. The lid 22 is integrated with the case 21 in a state where the electrode body 3 and the conductive member 4 are housed in the housing portion 20r. The case 21 and the lid 22 are connected to each other by, for example, welding, and leakage of liquid, gas, or the like from the combined portion is suppressed. The case 21 may also be referred to as a first housing member, a lower case, or the like, and the lid 22 may also be referred to as a second housing member, an upper case, a cover, or the like. The housing 2 is made of, for example, a metal material such as aluminum.

Further, the lid 22, that is, the wall portion 20f has a back surface 20f2 facing the accommodating portion 20r side and a front surface 20f1 facing the side opposite to the accommodating portion 20r. The positive electrode terminal 23 and the negative electrode terminal 24 as the external connection terminal 7 are exposed on the surface 20f1. The positive electrode terminal 23 and the negative electrode terminal 24 are positioned at intervals in the Y direction from each other. The Y direction is an example of a direction along the surface 20f1.

Further, as shown in FIGS. 2 to 4, the wall portion 20f is provided with a plurality of bottomed recesses 26 and 28 opened on the surface 20f1. The recess 26 is formed in a quadrangular shape in the Z direction, that is, in the line of sight in the thickness direction of the wall portion 20f (FIG. 4). In the present embodiment, two recesses 26 are provided at intervals in the Y direction corresponding to the positive electrode terminal 23 and the negative electrode terminal 24. The recess 26 is an example of the first recess.

Further, the recess 28 extends in the X direction along the edge portions 26e1, 26e2 on the intermediate position C side of the wall portion 20f and the opposite side of the four edge portions 26e (see FIG. 4) of the recess 26. In the present embodiment, two recesses 28 are provided adjacent to each of the recesses 26. The recess 26 is located between the two recesses 28, and the recess 26 and the two recesses 28 are aligned in the Y direction. The recess 28 is an example of the second recess. Further, the edge portion 26e may also be referred to as a side portion, an end portion, or the like.

Further, a through hole 27 is provided in the bottom surface 26a of the recess 26. As shown in FIG. 3, the through hole 27 penetrates the wall portion 20f between the bottom surface 26a and the back surface 20f2. The through hole 27 is formed in a circular shape in the line of sight in the Z direction (FIG. 4). As shown in FIG. 2, the shaft portion 7b of the external connection terminals 7 is inserted into the through hole 27.

The external connection terminal 7 has, for example, a head portion 7a, a shaft portion 7b, and a coupling portion 7c. The head portion 7a is connected to the shaft portion 7b on the front surface 20f1 side of the through hole 27, and the connecting portion 7c is connected to the shaft portion 7b on the back surface 20f2 side of the through hole 27. As shown in FIGS. 1 and 2, the head portion 7a is formed in a rectangular plate shape along the edge portion 26e (see FIG. 4) of the recess 26. The width of the head 7a along the radial direction (XY plane) is larger than the opening width (diameter) of the through hole 27. Further, the shaft portion 7b is formed in a columnar shape along the inner peripheral surface 27a of the through hole 27.

The coupling portion 7c is, for example, a portion that projects along the radial direction (XY plane) from the end portion of the shaft portion 7b when the external connection terminal 7 and the conductive member 4 are coupled to each other by caulking. The connecting portion 7c overlaps the conductive member 4 in the Z direction, and the conductive member 4 and the sealing member 5 are sandwiched between the connecting portion 7c and the head portion 7a. As shown in FIG. 2, when the external connection terminal 7 and the conductive member 4 are connected to each other, at least a part of the head portion 7a is located in the recess 26. As a result, the amount of protrusion of the head 7a from the surface 20f1 can be suppressed, and the battery 1 can be made smaller in the Z direction. Further, the sealing property is enhanced by sandwiching the sealing member 5 between the head portion 7a and the conductive member 4 in an elastically compressed state. The connecting portion 7c may also be referred to as a caulking portion, a flange portion, an overhanging portion, a hooking portion, or the like.

As shown in FIG. 1, the positive electrode terminal 23, which is one of the external connection terminals 7, is provided so as to penetrate the wall portion 20f, and is coupled to the positive electrode lead 4R, which is one of the conductive members 4, inside the wall portion 20f. Will be done. Further, as shown in FIG. 2, the negative electrode terminal 24, which is the other side of the external connection terminal 7, is provided so as to penetrate the wall portion 20f, and the negative electrode lead 4L, which is the other side of the conductive member 4 inside the wall portion 20f. Combined with. The back surface 20f2 of the wall portion 20f is provided with an insulating layer 8 such as an insulating sheet that insulates the lid 22 and the conductive member 4.

As shown in FIG. 1, the electrode body 3 has, for example, a positive electrode 31, a negative electrode 32, and an insulating layer 33 (separator). The positive electrode 31, the negative electrode 32, and the insulating layer 33 are each formed in a sheet shape. The electrode body 3 is formed into a flat shape by winding or folding the sheet-shaped positive electrode 31, the negative electrode 32, and the insulating layer 33 around the axis along the Y direction. The electrode body 3 is a group of electrodes and functions as a power generation element.

Further, the positive electrode 31 and the negative electrode 32 each have a current collector, an active material layer covering the current collector, a current collector tab protruding from the current collector, and the like. The current collecting tab of the positive electrode 31 is located at the end of the electrode body 3 in the direction opposite to the Y direction, and is connected to the positive electrode backup lead 35 shown in FIG. The current collecting tab of the negative electrode 32 is located at the end of the electrode body 3 in the Y direction and is connected to the negative electrode backup lead 36 shown in FIG. The positive electrode backup lead 35 and the negative electrode backup lead 36 can also be referred to as a lead member, a conductive member, a connecting member, a terminal member, and the like.

The positive electrode lead 4R, which is one of the conductive members 4, electrically connects the positive electrode 31 and the positive electrode terminal 23 via the positive electrode backup lead 35. The positive electrode lead 4R and the positive electrode terminal 23 are bonded to each other by caulking, and the positive electrode lead 4R and the positive electrode backup lead 35 are bonded to each other by, for example, ultrasonic welding.

Further, the negative electrode lead 4L, which is the other side of the conductive member 4, electrically connects the negative electrode 32 and the negative electrode terminal 24 via the negative electrode backup lead 36. The negative electrode lead 4L and the negative electrode terminal 24 are bonded to each other by caulking, and the negative electrode lead 4L and the negative electrode backup lead 36 are bonded to each other by, for example, ultrasonic welding.

As shown in FIG. 1, the conductive member 4 has, for example, a base portion 4a and an arm portion 4b. The conductive member 4 is composed of, for example, a single plate-shaped member bent at two locations (the root portion of the arm portion 4b). The conductive member 4 may be formed by connecting the base portion 4a and the arm portion 4b to each other by, for example, welding.

The base portion 4a is formed in a rectangular plate shape extending along the wall portion 20f (XY plane). The base portion 4a is overlapped with the wall portion 20f with the insulating layer 8 (see FIG. 2) sandwiched inside the wall portion 20f (on the side of the accommodating portion 20r). Further, the base portion 4a is provided with a through hole 4a1 into which an external connection terminal 7 (positive electrode terminal 23 or negative electrode terminal 24) is inserted.

As shown in FIG. 1, the arm portion 4b extends from the base portion 4a toward the wall portion 20e (bottom wall portion) side in a direction intersecting with the base portion 4a. The arm portion 4b is formed in a rectangular plate shape along the wall portions 20a and 20c (YZ plane).

Further, the arm portion 4b has a first arm portion 4b1 and a second arm portion 4b2. The first arm portion 4b1 and the second arm portion 4b2 are provided parallel to each other at intervals in the X direction, that is, in the thickness direction of the electrode body 3. The conductive member 4 has a positive electrode backup lead 35 or a negative electrode backup of the electrode body 3 with an end portion (current collection tab) of the electrode body 3 sandwiched between the first arm portion 4b1 and the second arm portion 4b2. Combined with lead 36.

The conductive member 4 is inserted into the accommodating portion 20r of the case 21 in a state of being integrated with the electrode body 3 and the lid 22. Then, the lid 22 is joined to the upper end portion 20j of the case 21 in a state of closing the accommodating portion 20r. After that, the electrolytic solution is injected into the housing 2 from a liquid injection port (not shown) provided on the lid 22 by a predetermined amount, for example, an amount by which the electrode body 3 is sufficiently immersed by the electrolytic solution. Then, the liquid injection port is sealed by welding or the like. A valve portion (not shown) may be provided between the positive electrode terminal 23 and the negative electrode terminal 24 of the lid 22. The valve portion is opened when the pressure in the housing 2 becomes higher than the threshold value, and the pressure in the housing 2 is reduced. The valve portion is provided, for example, at an intermediate position C (see FIGS. 3 and 4) between the positive electrode terminal 23 and the negative electrode terminal 24.

As shown in FIG. 2, the sealing member 5 has, for example, a tubular portion 5a, a first flange portion 5b, and a second flange portion 5c. The tubular portion 5a is interposed between the inner peripheral surface 27a of the through hole 27 and the outer peripheral surface of the shaft portion 7b. In the present embodiment, for example, when the external connection terminal 7 is crimped, the external connection terminal 7 is compressed in the Z direction, so that the shaft portion 7b swells along the radial direction (XY plane). As a result, the tubular portion 5a is sandwiched between the outer peripheral surface of the shaft portion 7b and the inner peripheral surface 27a of the through hole 27 in an elastically compressed state, and thus the sealing property of the through hole 27 can be improved.

Further, the first flange portion 5b extends from the end portion of the tubular portion 5a in the Z direction along the bottom surface 26a to the side opposite to the shaft portion 7b, and the second flange portion 5c is the Z of the tubular portion 5a. It extends from the end in the opposite direction along the back surface 20f2 to the side opposite to the shaft portion 7b. The first flange portion 5b is interposed between the head portion 7a and the bottom surface 26a, and the second flange portion 5c is interposed between the base portion 4a and the back surface 20f2. The first flange portion 5b and the second flange portion 5c are sandwiched between the head portion 7a and the base portion 4a in an elastically compressed state, so that the sealing property is enhanced. The seal member 5 is made of, for example, an insulator (elastic body) such as a synthetic resin material. The sealing member 5 may also be referred to as a gasket, packing, inclusions, or the like.

As shown in FIG. 2, the insulating member 6 has, for example, a first portion 6a, a second portion 6b, and a third portion 6c. The first portion 6a is formed in a square tubular shape along the edge portion 26e (see FIG. 4) of the recess 26, for example. The first portion 6a is located in the recess 26 and is interposed between the sealing member 5 and the head 7a and the side surface 26b of the recess 26. The first portion 6a may also be referred to as a tubular portion or the like.

The second portion 6b extends from the end of the first portion 6a in the Z direction along the surface 20f1 to the side opposite to the head 7a. As shown in FIG. 1, the second portion 6b is formed in a rectangular frame shape in the line of sight in the Z direction. The first portion 6a and the second portion 6b are interposed between the external connection terminal 7 and the wall portion 20f and cover the periphery of the external connection terminal 7. The insulating member 6 is made of, for example, an insulator (elastic body) such as a synthetic resin material. The insulating member 6 may also be referred to as a gasket, packing, inclusions, or the like. Further, the second portion 6b may also be referred to as a flange portion, an overhanging portion, or the like.

As shown in FIG. 2, the third portion 6c projects from the second portion 6b into the recess 28. The third portion 6c is elongated in the X direction along the recess 28 shown in FIG. Then, in the present embodiment, for example, the third portion 6c is mechanically joined to the recess 28 by press-fitting the third portion 6c into the recess 28. That is, the third portion 6c and the recess 28 are hooked on each other in the Y direction and the X direction. The third portion 6c may also be referred to as a convex portion, a protruding portion, a fitting portion, a hooking portion, or the like.

As described above, in the present embodiment, when the external connection terminal 7 is crimped, the external connection terminal 7 is compressed in the Z direction, so that the shaft portion 7b swells along the radial direction (XY plane). Therefore, when the seal member 5 and the insulating member 6 are sandwiched between the outer peripheral surface of the shaft portion 7b and the side surface 26b of the recess 26 in an elastically compressed state, the insulating member 6 serves as a fulcrum of the first portion 6a. There is a possibility that a gap may be formed between the tip portion 6b1 of the second portion 6b and the surface 20f1. In that respect, according to the present embodiment, for example, since the third portion 6c and the recess 28 are caught by each other, deformation (tilting, warpage) with the first portion 6a of the insulating member 6 as a fulcrum is suppressed. be able to. Therefore, for example, it is easy to suppress the formation of a gap between the tip portion 6b1 of the second portion 6b and the surface 20f1, and by extension, the invasion of dust, water droplets, etc. into the through hole 27 side through the gap is suppressed. be able to.

As described above, in the present embodiment, for example, the insulating member 6 has a first portion 6a located in the recess 26 (first recess), a second portion 6b along the surface 20f1, and a second portion. It has a third portion 6c protruding from the second portion 6b into the recess 28 (second recess). Therefore, according to the present embodiment, for example, the recess 28 and the third portion 6c can suppress deformation (tilting, warping) with the first portion 6a of the insulating member 6 as a fulcrum. Therefore, for example, it is easy to suppress the formation of a gap between the tip portion 6b1 of the second portion 6b and the surface 20f1, and by extension, the invasion of dust, water droplets, etc. into the through hole 27 side through the gap is suppressed. be able to.

Further, according to the present embodiment, since the recess 28 is provided in the wall portion 20f, for example, when the recesses 26 and 28 are formed by coining (imprinting) or the like, between the bottom surface 26a and the side surface 26b of the recess 26. There is also an advantage that so-called sagging of a rounded corner (corner R) shape is less likely to occur at the corner portion 26c of the above. If the corner portion 26c of the recess 26 is sagging in a rounded (cornered R) shape, the seal member 5 and the insulating member 6 are sandwiched between the outer peripheral surface of the shaft portion 7b and the side surface 26b of the recess 26. In addition, there is a risk that the first portion 6a of the insulating member 6 will rise in the direction of coming out of the recess 26. In that respect, according to the present embodiment, for example, the concave portion 28 makes it easier to form the corner portion 26c of the concave portion 26 with higher accuracy. Therefore, for example, the deformation of the insulating member 6 in the direction of coming out of the recess 26 is easily suppressed, and the formation of a gap between the second portion 6b and the surface 20f1 is more likely to be suppressed.

Further, in the present embodiment, for example, the external connection terminal 7 includes a positive electrode terminal 23 and a negative electrode terminal 24 located at intervals in the Y direction along the surface 20f1, and the recess 28 is a positive electrode terminal 23 and a negative electrode terminal. It is provided between 24 and 24. Therefore, according to the present embodiment, for example, the edge portion on the intermediate position C side where the concave portion 28 is most likely to cause sagging of the rounded corner (corner R) shape among the four edge portions 26e (see FIG. 4) of the concave portion 26. It is possible to effectively suppress the occurrence of sagging at the corner portion 26c of 26e1.

Further, in the present embodiment, for example, the recess 28 is located closer to the positive electrode terminal 23 or the negative electrode terminal 24 than the intermediate position C (valve portion) between the positive electrode terminal 23 and the negative electrode terminal 24. Therefore, according to the present embodiment, for example, the edge portion 26e and the recessed portion 28 of the recessed portion 26 are more likely to be arranged closer to each other, the corner portion 26c is formed more accurately, and the insulating member 6 is made smaller. It can be configured.

Further, in the present embodiment, for example, the recess 28 extends along the edge 26e of the recess 26 on the surface 20f1. Therefore, according to the present embodiment, for example, the concave portion 28 makes it easier for the corner portion 26c of the concave portion 26 to be formed more accurately along the edge portion 26e.

In the present embodiment, the case where the recesses 28 are provided on both sides of the recesses 26 has been exemplified, but the present invention is not limited to this, and for example, the battery 1A of the first modification shown in FIG. In addition, the recess 28A may be provided only on the edge 26e1 side of the recess 26. Of the four edge portions 26e of the recess 26, the edge portion 26e2 on the side opposite to the intermediate position C is the distance from the mold retainer when the recesses 26 and 28A are formed by coining (imprinting) as compared with the edge portion 26e1. Becomes closer. Therefore, the corner portion 26c on the edge portion 26e2 side of the recess 26 is less likely to have a rounded (corner R) shape than the corner portion 26c on the edge portion 26e1 side. Therefore, as in the first modification, the recess 28A may be provided only on the edge 26e1 side of the recess 26.

Further, as in the battery 1B of the second modification shown in FIG. 6, the recess 28B may be formed in a rectangular frame shape along the four edge portions 26e. According to the second modification, since the contact area between the recess 28B and the third portion 6c is increased, the deformation of the insulating member 6 can be further suppressed.

Although the embodiments of the present invention have been illustrated above, the above embodiments are merely examples and are not intended to limit the scope of the invention. The above-described embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the gist of the invention. The above-described embodiment is included in the scope and gist of the invention, and is also included in the scope of the invention described in the claims and the equivalent scope thereof. The present invention can be realized by a configuration other than the configuration disclosed in the above embodiment, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can be done.

1,1A, 1B ... Battery, 2 ... Housing, 3 ... Electrode body, 5 ... Seal member, 6 ... Insulation member, 6a ... First part, 6b ... Second part, 6c ... Third part, 7 ... External connection terminal, 20f ... Wall (first wall), 20f1 ... Front surface, 20f2 ... Back surface, 23 ... Positive terminal, 24 ... Negative terminal, 26 ... Recess (first recess), 26a ... Bottom, 26e ... edge, 27 ... through hole, 27a ... inner peripheral surface, 28, 28A, 28B ... recess (second recess), C ... intermediate position, Y ... direction along the surface.

Claims (3)

The housing in which the electrode body is housed and
A penetrating portion provided in the housing and penetrating the outside and the inside of the housing,
An external connection terminal inserted into the penetration portion and electrically connected to the electrode body,
A recess formed on the outer surface of the housing and outside the outer edge of the external connection terminal,
A seal member interposed between the external connection terminal and the inner peripheral surface of the penetrating portion in a compressed state over the entire circumference of the inner peripheral surface.
An insulating member having a contact portion that comes into contact with the end portion of the seal member and a protrusion portion that is separated from the contact portion and protrudes into the recess.
Batteries with. The external connection terminal includes a positive electrode terminal and a negative electrode terminal located at intervals along the outer surface of the housing.
The battery according to claim 1, wherein the recess is provided between the positive electrode terminal and the negative electrode terminal. The battery according to claim 2, wherein the recess is located closer to the positive electrode terminal or the negative electrode terminal than the intermediate position between the positive electrode terminal and the negative electrode terminal.

Images