JP2018147683A - Sealed battery and electrode terminals - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed battery having an electrode terminal capable of surely preventing energization between a lid and a current collecting member with a simple structure. An electrode terminal (30) of a sealed battery disclosed herein has a current collecting member (32) whose end portion (32b) is exposed to the outside of the case (10), and an outside connected to the current collecting member (32) outside the case (10). The connecting member 36, the insulating holder 38 that is disposed between the external connecting member 36 and the case 10, and has the first insertion hole 38c through which the current collecting member 32 is inserted, the case 10, and the current collecting member 32. And a sealing member 39 having a sealing portion 39b which is interposed between the insulating holder 38 and the bottom surface of the insulating holder 38 and is press-fitted. In the sealed battery disclosed herein, the cutout portion 38d is provided on the bottom surface of the insulating holder 38 around the first insertion hole 38c, and the inner peripheral edge portion of the sealing portion 39b is formed as the cutout portion 38d. The seal member 39 and the insulating holder 38 are crimped so as to enter. [Selection diagram] Fig. 5

Description

  The present invention relates to a sealed battery and an electrode terminal used for the sealed battery.

Secondary batteries such as lithium ion secondary batteries and nickel metal hydride batteries are becoming increasingly important as on-vehicle power supplies or personal computers and portable terminals. Such a secondary battery is constructed, for example, as a sealed battery in which an electrode body together with an electrolyte substance is sealed in a case.
Such a sealed battery case is provided with an electrode terminal that is electrically connected to an external device such as another battery or a motor. For example, an assembled battery composed of a plurality of batteries can be constructed by arranging two or more sealed batteries adjacent to each other and connecting the electrode terminals of each battery via a bus bar.

An example of a sealed battery provided with such an electrode terminal is shown in FIG. A sealed battery 100 shown in FIG. 1 includes a flat rectangular case 10, and an electrode body 20 is accommodated in the case 10. The case 10 includes a flat rectangular case main body 12 having an upper surface opened, and a lid 14 that closes the opening on the upper surface of the case main body 12. A negative electrode terminal 30 is provided.
Each electrode terminal 30 includes a current collecting member 32, a bolt 34, and an external connection member 36. One end 32 a of the current collecting member 32 is connected to the electrode body 20 in the case 10, and the other end 32 b is exposed outside the case 10. Further, the bolt 34 includes a columnar connection portion 34a that is electrically connected to the external device. In the electrode terminal 30, the current collecting member 32 and the bolt 34 are electrically connected by a plate-like external connection member 36. In addition, in this electrode terminal 30, an insulating holder 38 is disposed between the external connection member 36 and the lid body 14 in order to prevent each member described above from energizing the case 10 (lid body 14). Yes.

  Further, in the electrode terminal 30, as shown in FIG. 2, an insulating seal member 39 is provided on the lower surface of the lid body 14 in order to prevent the lid body 14 and the current collecting member 32 from energizing inside the case 10. Is placed. As shown in FIG. 8, the sealing member 39 is formed with a cylindrical sealing portion 39 b protruding upward, and the sealing portion 39 b is formed in the current collecting member insertion hole 14 a of the lid body 14. It is inserted through and crimped to the bottom surface of the insulating holder 38. Thereby, since the current collection member insertion hole 14a of the lid body 14 is covered by the insulating holder 38 and the seal member 39, the lid body 14 and the current collection member 32 can be prevented from being energized. Examples of the seal structure in such an electrode terminal are described in Patent Documents 1 and 2.

Patent No. 5930033 JP 2016-173907 A

Incidentally, in recent years, there has been an increasing demand for improving the safety of sealed batteries, and there is a need for a technique that can more reliably prevent energization between the lid 14 (case 10) and the current collector 32. Yes. On the other hand, from the viewpoint of electrode terminal strength, component cost, manufacturing efficiency, and the like, it is also required to simplify the insulating structure including the insulating holder 38 and the seal member 39 described above.
The present invention has been made in view of such a point, and a main object thereof is a sealed battery having an electrode terminal that can reliably prevent energization between the lid and the current collecting member with a simple structure. The purpose is to provide.

  In order to achieve the above object, the present invention provides a sealed battery having the following configuration.

The sealed battery disclosed here is configured by housing an electrode body in a case, and an electrode terminal connected to an external device is provided in the case.
The electrode terminal of such a sealed battery has a current collecting member in which one end is electrically connected to the electrode body in the case and the other end is exposed to the outside of the case, and the outside of the case A plate-like external connecting member electrically connected to the current collecting member, and an insulating member disposed between the external connecting member and the case, the other end of the current collecting member being inserted An insulating holder in which one insertion hole is formed, and a second insertion hole which is an insulating member interposed between the case and the current collecting member inside the case and into which the other end of the current collecting member is inserted And a sealing member formed with a cylindrical sealing portion that penetrates the case around the second insertion hole and is crimped to the bottom surface of the insulating holder.
In the sealed battery disclosed here, a notch is provided in the bottom surface of the insulating holder around the first insertion hole, and the inner peripheral edge of the upper surface of the cylindrical sealing portion is cut off from the insulating holder. The sealing part of the sealing member and the insulating holder are pressure-bonded so as to enter the notch part.

In order to solve the above-described problems, the present inventor first examined the possibility that the lid 14 and the current collecting member 32 are energized in the electrode terminal 30 having a conventional structure as shown in FIG.
As a result of such examination, in the electrode terminal 30 having the structure shown in FIG. 8, the bottom surface of the insulating holder 38 and the sealing portion 39b of the seal member 39 are brought into contact with each other and are crimped. It has been found that when the pressure is lowered, a gap may be generated between the bottom surface of the insulating holder 38 and the top surface of the sealing portion 39b. The present inventor has considered that depending on the use environment of the sealed battery, the lid 14 and the current collecting member 32 may be energized by water vapor entering the gap and causing condensation.

Therefore, in order to further improve the safety of the sealed battery, the present inventor securely presses the bottom surface of the insulating holder and the sealing portion without any gap, and reliably prevents energization between the lid and the current collecting member due to condensation. We examined possible insulation structures.
Of the various insulation structures that have been conceived through such studies, further studies have been conducted on simple insulation structures that do not decrease the strength of the electrode terminals and that can provide favorable effects in terms of component costs and manufacturing efficiency. The inventors have completed the sealed battery disclosed here.

  Specifically, in the sealed battery disclosed herein, a notch is provided on the bottom surface of the insulating holder around the first insertion hole. When such a notch is provided, when the sealing part of the sealing member and the insulating holder are pressure-bonded, the inner peripheral edge of the upper surface of the cylindrical sealing part is deformed so as to enter the notch of the insulating holder. . This concentrates the stress at the time of crimping on the contact point between the upper surface of the sealing part and the notch part. Therefore, unlike the conventional technique in which the insulation holder and the sealing member are brought into contact with each other and crimped, the insulation holder and the seal Since the member can be securely crimped, it is possible to reliably prevent dew condensation from occurring in the gap between the insulating holder and the sealing portion and the energization of the lid and the current collecting member.

Further, as described above, the sealed battery disclosed herein is configured so that the current collecting member and the case can be prevented from being energized with a simple structure in consideration of the strength of the electrode terminal, component cost, manufacturing efficiency, and the like. Has been.
Specifically, in the sealed battery disclosed herein, a notch is provided on the bottom surface of the insulating holder around the first insertion hole. As a result, the notch can be easily formed only by slightly expanding the diameter of the first insertion hole on the bottom surface side of the insulating holder, so there is no need to perform complicated processing on the insulating holder or the seal member. Thus, an increase in component costs and a decrease in manufacturing efficiency can be appropriately suppressed.
Moreover, in the sealed battery disclosed here, a notch is provided on the bottom surface of the insulating holder among the sealing portion of the sealing member and the bottom surface of the insulating holder. This is because when a notch is provided in a sealing portion which is a cylindrical projection, the strength of the sealing portion is reduced, and in the case of crimping, a crimping failure due to damage of the sealing portion or a reduction in strength of the electrode terminal occurs. This is because there is a fear.
Further, in the sealed battery disclosed herein, the cutout portion is formed so that only the inner peripheral edge portion of the cylindrical sealing portion enters the cutout portion of the insulating holder. In this way, by reducing the deformation amount of the sealing part at the time of pressure bonding, it is possible to suitably prevent the occurrence of poor pressure bonding and strength reduction due to defective deformation of the sealing part.

In a preferred embodiment of the sealed battery disclosed herein, the notch is formed in a tapered shape that is inclined so that the diameter of the first insertion hole increases toward the bottom surface of the insulating holder.
When the tapered notch is formed as in this aspect, the sealing part of the seal member can be deformed along the inclined surface of the notch when the insulating holder and the seal member are pressure-bonded. Further, it is possible to more suitably prevent the deformation failure of the sealing portion.

In a preferred embodiment of the sealed battery disclosed herein, the radial length of the notch portion on the bottom surface of the insulating holder when the thickness of the sealing portion of the sealing member is 100% is 10% to 60%. is there.
It is preferable that the dimension of the above-described notch is appropriately adjusted in consideration of the material of the seal member and the insulating holder. If the length of the cutout portion in the radial direction with respect to the thickness of the sealing portion is too short, the sealing portion may not be sufficiently allowed to enter the cutout portion. On the other hand, if the length of the cutout portion in the radial direction is too long, the amount of deformation of the sealing portion at the time of pressure bonding increases, so that the possibility of defective deformation increases. Considering these, the length of the notch in the radial direction is preferably 10% to 60% of the thickness of the seal member.

In a preferred embodiment of the sealed battery disclosed here, the depth of the notch when the thickness of the insulating holder is 100% is 10% to 40%.
Similar to the length of the cutout portion in the radial direction, the depth of the cutout portion is preferably adjusted as appropriate in consideration of the material of the seal member and the insulating holder. For example, if the cutout portion is too shallow, there is a possibility that the sealing portion cannot sufficiently enter the cutout portion. On the other hand, if the notch is too deep, the amount of deformation of the sealing part at the time of pressure bonding becomes large, so that there is a high possibility that deformation will occur. Considering these, it is preferable that the depth of the notch is 10% to 40% of the thickness of the insulating holder.

Moreover, this invention provides the electrode terminal used for an above-described sealed battery as one side surface for solving the said subject.
The electrode terminal includes a current collecting member having one end electrically connected to the electrode body in the case and the other end exposed to the outside of the case, and a current collecting member outside the case A plate-like external connection member electrically connected to the first connection hole, and an insulating member disposed between the external connection member and the case, the first insertion hole through which the other end of the current collection member is inserted A second insertion hole, through which the other end of the current collecting member is inserted, is formed between the insulating holder formed and an insulating member interposed between the case and the current collecting member inside the case; 2 is provided with a sealing member formed with a cylindrical sealing portion that penetrates the case and is crimped to the bottom surface of the insulating holder around the insertion hole.
And in the electrode terminal disclosed here, the notch part is provided in the bottom face of the insulating holder around the first insertion hole, and the inner peripheral edge part of the upper surface of the cylindrical sealing part is the notch of the insulating holder. The sealing portion of the sealing member and the insulating holder are pressure-bonded so as to enter the portion.

  According to the electrode terminal having such a structure, when the sealing portion of the sealing member and the insulating holder are pressure-bonded, the inner peripheral edge portion of the cylindrical sealing portion is deformed so as to enter the notch portion, whereby the insulating holder And the sealing member can be securely bonded to each other. For this reason, it can prevent reliably that a clearance gap produces between an insulation holder and a sealing part, and a current collection member and a case energize.

It is a perspective view which shows a sealed battery typically. It is a disassembled perspective view of the electrode terminal of the sealed battery shown in FIG. It is sectional drawing which shows typically the structure of the electrode terminal vicinity of the sealed battery which concerns on one Embodiment of this invention. It is an expanded sectional view near the 1st penetration hole of the insulating holder in one embodiment of the present invention. It is sectional drawing to which the area | region shown by V in FIG. 3 was expanded. It is sectional drawing to which the area | region of the electrode terminal vicinity in other embodiment of this invention was expanded. It is sectional drawing to which the area | region of the electrode terminal vicinity in other embodiment of this invention was expanded. It is sectional drawing to which the area | region of the electrode terminal vicinity of the conventional sealed battery was expanded.

  Hereinafter, a lithium ion secondary battery will be described as an example of a sealed battery according to an embodiment of the present invention. The sealed battery disclosed here is not limited to a lithium ion secondary battery, and may be, for example, a nickel metal hydride battery.

  Moreover, in the following drawings, the same code | symbol is attached | subjected and demonstrated to the member and site | part which show | plays the same effect | action. In addition, the dimensional relationship (length, width, thickness, etc.) in each drawing does not reflect the actual dimensional relationship. Further, matters other than matters specifically mentioned in the present specification and matters necessary for the implementation of the present invention (for example, general construction related to the construction of a lithium ion secondary battery such as an electrode body and an electrolyte substance and a manufacturing method thereof) Technical technology etc.) can be understood as a design matter of those skilled in the art based on the prior art in the field.

1. Overall Configuration The basic structure of a sealed battery according to this embodiment is the same as that of a conventional sealed battery. Specifically, as shown in FIG. 1, the sealed battery 100 according to this embodiment is configured by housing an electrode body 20 in a flat rectangular case 10. The case 10 of the sealed battery 100 includes a flat rectangular case main body 12 having an open upper surface and a plate-like lid body 14 that closes the opening on the upper surface of the case main body 12. Such a case 10 is preferably composed mainly of a metal material that is lightweight and has good thermal conductivity. Examples of such a metal material include aluminum.

The electrode body 20 accommodated in the case 10 includes positive and negative electrodes in which a composite layer containing an electrode active material capable of occluding and releasing lithium ions is provided on the surface of a foil-shaped current collector.
In the present embodiment, a wound electrode body is used as the electrode body 20. Although not shown in the drawings, the wound electrode body 20 is provided on the surface of a foil-like positive electrode current collector, a long sheet-like positive electrode provided with a positive electrode mixture layer on the surface of the foil-like positive electrode current collector, and the surface of the foil-like negative electrode current collector. It is formed by laminating these positive and negative electrodes through a separator and winding the laminate. A wound core portion 20A is formed at the center of the wound electrode body 20 in the width direction X so that the positive and negative electrode mixture layers are opposed to each other. A terminal connection portion 20B is formed in which a current collector not provided with a material layer is wound.
In the sealed battery 100 according to the present embodiment, the material of each member (for example, the positive electrode, the negative electrode, and the separator) constituting the electrode body 20 is the same as that used for a conventional general lithium ion secondary battery. The present invention can be used without limitation, and does not characterize the present invention.

  In addition, the case 10 of the sealed battery 100 according to the present embodiment contains an electrolyte substance together with the electrode body 20 described above, and this electrolyte substance is also a conventional general lithium ion secondary battery. Since the same thing as can be used without particular limitation, detailed description is omitted.

In the sealed battery 100 according to this embodiment, an electrode terminal 30 that is electrically connected to an external device such as another battery or a motor is provided on the lid 14 that forms the upper surface of the case 10. The electrode terminal 30 is electrically connected to the electrode body 20 in the case 10 and is configured to be exposed to the outside of the case 10 and connectable to an external device.
Hereinafter, a specific structure of the electrode terminal 30 in the present embodiment will be described.

2. Electrode Terminal (1) Constituent Member of Electrode Terminal FIG. 3 is a cross-sectional view schematically showing the structure in the vicinity of the electrode terminal 30 of the sealed battery 100 according to this embodiment. The electrode terminal 30 of the sealed battery 100 according to the present embodiment includes a current collecting member 32, a bolt 34, an external connection member 36, an insulating holder 38, and a seal member 39. Hereinafter, the structure of each member constituting the electrode terminal 30 will be described.

(A) Current collecting member The current collecting member 32 is a long member made of a conductive material. As shown in FIG. 1, one end 32 a of the current collecting member 32 is electrically connected to the electrode body 20 in the case 10, and the other end 32 b penetrates the lid body 14 of the case 10. Exposed outside. Specifically, one end portion 32 a of the current collecting member 32 is formed in a long plate shape, extends along the vertical direction Z of the sealed battery 100, and is a terminal of the electrode body 20 in the case 10. It is connected to the connection unit 20B. On the other hand, the other end portion 32b of the current collecting member 32 is exposed to the outside of the case 10 through each of the seal member 39, the lid body 14, the insulating holder 38, and the external connection member 36, as shown in FIG. ing. The current collecting member 32 fixes the above-described members to the lid 14 of the case 10 by caulking the other end 32b formed in a cylindrical shape as shown in FIG. doing. Examples of the conductive material used for the current collecting member 32 include aluminum and copper.

(B) Bolt The bolt 34 is a conductive member provided with a columnar connection portion 34 a standing outside the case 10 along the vertical direction Z of the sealed battery, and is made of the same material as the current collecting member 32 described above. It is preferable to be configured. A screw groove (not shown) is formed on the outer peripheral surface of the columnar connecting portion 34a. For example, after the connection part 34a of the bolt 34 is passed through a plate-like bus bar (not shown), the sealed battery and the external device are electrically connected by tightening a nut into the connection part 34a.
On the other hand, with this bolt 34, in order to prevent the bolt 34 from rotating when it is connected to the external device described above, as shown in FIG. 2 and FIG. A certain fitting portion 34b is formed. The fitting portion 34b of the bolt 34 is designed so as to correspond in shape and size to the bolt housing portion 38a of the insulating holder 38.

(C) External Connection Member The external connection member 36 is a plate-like conductive member that is electrically connected to the current collecting member 32 outside the case 10. The external connection member 36 in the present embodiment extends along the width direction X (see FIG. 1) of the sealed battery so as to electrically connect the current collecting member 32 and the above-described bolt 34. As shown in FIG. 2, a current collecting member insertion hole 36b through which the current collecting member 32 is inserted is formed at one end of the external connection member 36, and a bolt 34 is inserted at the other end. A bolt insertion hole 36a is provided. Further, the external connection member 36 in the present embodiment is bent in a step shape so as to correspond to the shape of the upper surface of an insulating holder 38 described later. For the external connection member 36, the same kind of conductive material as that of the current collecting member 32 can be used.

(D) Insulating Holder The insulating holder 38 is an insulating member provided to insulate the external connection member 36 and the lid body 14. As the material of the insulating holder 38, an insulating material of the same type as the sealing member 39 (for example, polyamide resin, polyacetal resin, polyimide resin, etc.) can be preferably used.
The insulating holder 38 is disposed between the external connection member 36 and the lid body 14, and each conductive member (the current collecting member 32, the bolt 34, and the external connection member 36) constituting the electrode terminal 30 is a case. It prevents energizing the 10 lids 14. Specifically, the insulating holder 38 extends along the width direction X of the sealed battery 100 similarly to the external connection member 36 described above, and is disposed between the external connection member 36 and the lid body 14. . A bolt housing portion 38a, which is a rectangular recess, is provided at one end portion of the insulating holder 38 to house the fitting portion 34b of the bolt 34. In the electrode terminal 30 in this embodiment, the rotation of the bolt 34 is restricted by fitting the fitting portion 34b of the bolt 34 described above into the bolt housing portion 38a.

  A first insertion hole 38 c through which the current collecting member 32 is inserted is formed at the other end of the insulating holder 38. In the present embodiment, in order to properly prevent the current collection member 32 and the case 10 (the lid body 14) from being energized by properly pressing the bottom surface of the insulating holder 38 and the sealing portion 39b of the seal member 39, A notch 38d is provided on the bottom surface of the insulating holder 38 around the first insertion hole 38c. The structure related to the notch 38d will be described in detail later.

(E) Seal Member The seal member 39 is an insulating member interposed between the case 10 and the current collecting member 32 inside the case 10. Specifically, the seal member 39 is provided on the cover body 14 of the case 10 in order to prevent the current collection member 32 inserted through the current collection member insertion hole 14a of the cover body 14 and the cover body 14 from being energized. It is the plate-shaped insulating member arrange | positioned at the lower surface of this. The sealing member 39 is formed with a second insertion hole 39a through which the end portion 32b of the current collecting member 32 is inserted, and a cylindrical sealing portion 39b protruding upward around the second insertion hole 39a. Is provided. As shown in FIG. 3, the sealing portion 39 b of the seal member 39 penetrates the lid body 14 by being inserted into the current collecting member insertion hole 14 a of the lid body 14, and is crimped to the bottom surface of the insulating holder 38. The sealing member 39 is made of the same insulating resin (for example, polyamide resin, polyacetal resin, polyimide resin, etc.) as the above-described insulating holder.

(2) Construction of Electrode Terminal The electrode terminal 30 of the sealed battery 100 according to the present embodiment is constructed by assembling each member described above to the lid body 14 of the case 10.

  In constructing the electrode terminal 30, first, the insulating holder 38 and the seal member 39 are attached to the lid body 14. Specifically, after the insulating holder 38 is disposed on the upper surface of the lid body 14 so that the current collecting member insertion hole 14a of the lid body 14 and the first insertion hole 38c of the insulating holder 38 communicate with each other, The sealing portion 39b is inserted into the current collecting member insertion hole 14a from the lower surface side of the lid body 14. Then, the bottom surface of the insulating holder 38 and the top surface of the cylindrical sealing portion 39b are pressure-bonded by sandwiching and pressing the insulating holder 38 and the seal member 39. As a result, the insulating holder 38 and the seal member 39 are attached to the lid 14, and the current collecting member insertion hole 14 a of the lid 14 is covered with the insulating member.

  Next, the bolt 34 and the external connection member 36 are disposed on the insulating holder 38. Specifically, after the bolt 34 is arranged on the upper surface of the insulating holder 38 so that the bolt storage portion 38a fits into the fitting portion 34b, the connection portion 34a of the bolt 34 is inserted into the bolt insertion hole 36a of the external connection member 36. The external connection member 36 is disposed on the upper surface of the insulating holder 38 by being inserted.

  Then, the other end portion 32b of the current collecting member 32 is inserted into the insertion holes 39a, 14a, 38c, 36b of the respective members so as to penetrate the seal member 39, the lid body 14, the insulating holder 38, and the external connection member 36. Then, the other end 32b of the cylindrical current collecting member 32 is caulked. As a result, each of the above-described members is fixed to the lid 14 of the case 10, and the bottom surface of the insulating holder 38 and the top surface of the sealing portion 39b are more firmly pressure-bonded, so that an electrode having a structure as shown in FIG. Terminal 30 is constructed.

(3) Notch As described above, in the sealed battery 100 according to the present embodiment, the current collecting member 32 and the case 10 are obtained by appropriately pressing the bottom surface of the insulating holder 38 and the sealing portion 39b of the seal member 39. In order to reliably prevent energization with the (cover body 14), a notch is provided in the bottom surface of the insulating holder 38 around the first insertion hole 38c. Hereinafter, the notch of the insulating holder 38 will be described. 4 is an enlarged cross-sectional view in the vicinity of the first insertion hole of the insulating holder in the present embodiment, and FIG. 5 is an enlarged cross-sectional view of a region indicated by V in FIG.

  As shown in FIG. 4, in the present embodiment, a notch 38d is provided around the first insertion hole 38c on the bottom surface of the insulating holder 38, and the diameter r2 of the first insertion hole 38c on the bottom surface side is the upper surface. This is larger than the diameter r1 of the first insertion hole 38c on the side. The notch 38d is continuously formed along the outer periphery of the first insertion hole 38c.

  When the insulating holder 38 provided with such a notch 38d is used, as shown in FIG. 5, when the insulating holder 38 and the sealing member 39 are pressure-bonded, the upper surface of the sealing portion 39b of the sealing member 39 The inner peripheral edge of the insulating holder 38 is deformed so as to enter the notch 38d. As a result, stress at the time of crimping is concentrated at the contact point between the upper surface of the sealing portion 39b and the cutout portion 38d to generate a stress concentration point P. At the stress concentration point P, there is no gap between the insulating holder 38 and the seal member 39. Crimped. For this reason, according to the sealed battery 100 according to the present embodiment, the gap between the insulating holder 38 and the seal member 39 is prevented from forming a gap that allows water vapor to enter, and Energization with the lid body 14 can be reliably prevented.

  The sealed battery according to the present embodiment can reliably prevent the current collecting member 32 and the lid 14 from being energized by a simple structure in which the cutout portion 38d is provided around the first insertion hole 38c. Therefore, it has excellent effects in terms of the strength of the electrode terminal, component cost, manufacturing efficiency, and the like.

Specifically, as shown in FIG. 4, the notch 38d can be easily formed by processing such that the bottom surface side of the first insertion hole 38c is slightly enlarged. Compared with a technique in which a plurality of projections and depressions are provided on a member or an insulating holder, an increase in component costs and a decrease in manufacturing efficiency can be suppressed.
Further, in the present embodiment, since the notched portion 38d is formed in the insulating holder 38 instead of the sealed portion 39b of the seal member 39, the strength of the sealed portion 39b can be sufficiently ensured. For this reason, it can prevent suitably that the front-end | tip of the sealing part 39b is damaged at the time of the crimping | compression-bonding of the insulating holder 38 and the sealing member 39, and a crimping | compression-bonding defect and a strength fall are produced.
Furthermore, in this embodiment, the insulating holder 38 and the seal member 39 can be pressure-bonded without a gap by a slight modification in which only the inner peripheral edge portion of the sealing portion 39b is inserted into the cutout portion 38d. For this reason, it can prevent suitably that the deformation defect of the sealing part 39b arises at the time of crimping | compression-bonding and a crimping | compression-bonding defect and a strength fall arise.

  Further, in the present embodiment, as shown in FIG. 4, a tapered notch portion 38 d that is inclined so that the diameter of the first insertion hole 38 c becomes larger toward the bottom surface side of the insulating holder 38 is provided. When the insulating holder 38 having such a tapered notch 38d is used, when the insulating holder 38 and the sealing member 39 are pressure-bonded, the inner peripheral edge of the sealing portion 39b of the sealing member 39 is Since it can be deformed along the inclined surface of the notch 38d, the deformation failure of the seal member 39 can be more suitably prevented.

  In addition, it is preferable that the dimension of the notch 38d is appropriately adjusted in consideration of the dimension of the seal member 39 and the like. For example, when the thickness t2 (see FIG. 5) of the sealing portion 39b is 100%, the radial length t1 (see FIG. 4) of the notch 38d is set within a range of 10% to 60%. Is preferred. If the length t1 of the notch 38d with respect to the thickness t2 of the sealing part 39b is too short, the sealing part 39b cannot sufficiently enter the notch 38d, and the sealing member 39 and the insulating holder 38 May not be properly crimped. On the other hand, if the length t1 in the radial direction of the notch 38d is too long, the amount of deformation of the sealing portion 39b during crimping increases, so that there is a high possibility that deformation will occur.

  Moreover, it is preferable to adjust suitably also about the depth d1 of the notch part 38d shown in FIG. 4 so that appropriate crimping | compression-bonding can be performed. For example, if the depth d1 of the cutout portion 38d is too shallow, the sealing portion 39b cannot be sufficiently inserted into the cutout portion 38d, and the seal member 39 and the insulating holder 38 may not be properly crimped. There is. On the other hand, if the depth d1 of the cutout portion 38d is too deep, the deformation amount of the sealing portion 39b is increased, and there is a high possibility that a deformation failure occurs. For this reason, the depth d1 of the notch 38d is preferably set to 10% to 40% of the thickness d2 of the insulating holder 38, for example.

3. Other Embodiments Although one embodiment of the sealed battery disclosed herein has been described, the present invention is not limited to the above-described embodiment, and various structures can be changed.

For example, in the above-described embodiment, the tapered notch 38d is formed as shown in FIG. 4, but the shape of the notch 38d is not limited to the above-described embodiment.
For example, another example of the notch 38d is a shape as shown in FIG. The notch 38 d shown in FIG. 6 is formed in a rectangular cross section, and a step is formed between the notch 38 d and the bottom surface of the insulating holder 38. When the insulating holder 38 having the notch 38d having such a structure is used, a stress concentration point P can be generated at the step on the bottom surface of the notch 38d, so that the sealing portion 39b and the insulating holder 38 Can be more firmly pressure-bonded.

  Another example of the shape of the notch 38d is a shape as shown in FIG. The notch 38d shown in FIG. 6 has a quadrangular cross section. Even in the case where the cutout portion 38d having such a shape is provided, the sealing portion 39b and the insulating holder 38 are pressure-bonded without any gap, and the current collection member 32 and the lid body 14 are preferably energized by condensation. Can be prevented.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

DESCRIPTION OF SYMBOLS 10 Case 12 Case main body 14 Cover body 14a Current collection member insertion hole 20 Electrode body (winding electrode body)
20A Winding core portion 20B Terminal connecting portion 30 Electrode terminal 32 Current collecting member 32a, 32b End of positive current collecting portion 34 Bolt 34a Connecting portion 34b Fitting portion 36 External connecting member 36a Bolt insertion hole 36b Current collecting of external connecting member Member insertion hole 38 Insulating holder 38a Bolt storage part 38c First insertion hole 38d Notch 39 Seal member 39a Second insertion hole 39b Sealing part 100 Sealed battery d1 Depth of notch d2 Insulation holder thickness P Stress concentration Point r1 Diameter of the current collecting member insertion hole on the top surface side r2 Diameter of the current collecting member insertion hole on the bottom surface side t1 Length in the radial direction of the notch t2 Thickness of the sealing portion X Width direction Z Vertical direction

Claims (5)

It is configured by accommodating an electrode body in a case, and is a sealed battery in which an electrode terminal connected to an external device is provided in the case,
The electrode terminal is
A current collecting member having one end electrically connected to the electrode body in the case and the other end exposed to the outside of the case;
A plate-like external connection member electrically connected to the current collecting member outside the case;
An insulating member disposed between the external connection member and the case, wherein an insulating holder is formed with a first insertion hole through which the other end of the current collecting member is inserted;
A second insertion hole through which the other end of the current collection member is inserted is formed inside the case between the case and the current collection member, and the second insertion hole And a sealing member formed with a cylindrical sealing portion that penetrates the case and is crimped to the bottom surface of the insulating holder.
Here, a notch is provided in the bottom surface of the insulating holder around the first insertion hole so that the inner peripheral edge of the top surface of the cylindrical sealing portion enters the notch in the insulating holder. A sealed battery in which a sealing portion of the sealing member and the insulating holder are pressure-bonded to each other.   2. The sealed battery according to claim 1, wherein the notch is formed in a tapered shape that is inclined such that a diameter of the first insertion hole increases toward a bottom surface of the insulating holder.   The length of the radial direction of the said notch part in the bottom face of the said insulation holder when the thickness of the sealing part of the said sealing member is 100% is 10%-60%. Sealed battery.   The sealed battery according to any one of claims 1 to 3, wherein a depth of the notch portion is 10% to 40% when a thickness of the insulating holder is 100%. An electrode terminal provided in the case of the sealed battery in which the electrode body is accommodated in the case and connected to an external device,
A current collecting member having one end electrically connected to the electrode body in the case and the other end exposed to the outside of the case;
A plate-like external connection member electrically connected to the current collecting member outside the case;
An insulating member disposed between the external connection member and the case, wherein an insulating holder is formed with a first insertion hole through which the other end of the current collecting member is inserted;
A second insertion hole through which the other end of the current collection member is inserted is formed inside the case between the case and the current collection member, and the second insertion hole And a sealing member formed with a cylindrical sealing portion that penetrates the case and is crimped to the bottom surface of the insulating holder.
Here, a notch is provided in the bottom surface of the insulating holder around the first insertion hole so that the inner peripheral edge of the top surface of the cylindrical sealing portion enters the notch in the insulating holder. An electrode terminal, wherein a sealing portion of the seal member and the insulating holder are pressure-bonded to each other.

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