JP5741201B2 - Sealed battery, assembled battery, and method for manufacturing sealed battery - Google Patents

Description

  The present invention relates to a sealed battery in which a power generation element is enclosed in a battery case, an assembled battery in which a plurality of the sealed batteries are combined, and a method for manufacturing the sealed battery. More specifically, the present invention relates to a sealed battery, an assembled battery, and a manufacturing method of the sealed battery having an internal terminal that is connected to a power generation element in the battery case and protrudes from the battery case to the outside and is also connected to an external terminal. It is.

  Conventionally, for example, there is a battery in which a power generation element is housed in a metal case and a lid is attached and sealed. Many of such sealed batteries have an internal terminal for connecting a power generation element inside the battery and a terminal outside the battery. As a structure for attaching the internal terminal and the external terminal, a structure in which a hollow member is caulked has been proposed (for example, see Patent Document 1).

  Patent Document 1 describes a battery in which a positive electrode tab is connected to a battery case and a negative electrode tab is connected to an internal terminal. In this document, an internal terminal having a hollow shaft portion is used, and the hollow shaft portion is protruded to the outside through a hole such as a lid, an external terminal, or a gasket, and the tip portion thereof is caulked. Is disclosed. According to this document, it is said that a structure having excellent adhesion between the terminal portion and the gasket can be obtained by caulking the hollow shaft portion.

JP 2009-289589 A

  However, in the battery described in Patent Document 1, the tip end portion of the hollow shaft portion after caulking is exposed to the outside of the battery at the central portion of the external terminal. This portion is formed so as to be flexible enough to be caulked, and has a slightly weaker configuration than other portions. For example, when an external terminal is connected to some other member, if the other member is brought into strong contact with the exposed portion, the exposed portion may be damaged.

  The present invention has been made to solve the problems of the conventional sealed battery described above. That is, the problem is that the inside and outside of the battery are electrically connected by a member having a hollow part, and the sealed battery and the assembled battery that can prevent the hollow part from being damaged and the sealed battery An object of the present invention is to provide a method for manufacturing a type battery.

In order to solve this problem, the sealed battery of the present invention includes a battery case in which a through-hole is formed, a power generation element accommodated in the battery case, and one end of the tube portion and the tube portion. With a through-hole formed in the bottom surface, with the bottom surface facing the battery case, and the bottom through-hole is placed over the battery case through-hole and placed outside the battery case And the internal terminal connected to the power generation element inside the battery case. The internal terminal passes through the through hole of the battery case and the through hole of the polar terminal, and A hollow projecting portion projecting toward the internal space of the portion, and a base end portion located on the inner surface side of the battery case and sandwiching the bottom surface of the battery case and the pole terminal together with the projecting portion, Out of the bottom of the pole pole terminal Minute, while located inside the cylindrical portion, but the maximum diameter is greater than the diameter of the through-hole of the pole terminals.

  According to the sealed battery of the present invention, since the battery case and the pole pole terminal are sandwiched by the internal terminal connected to the power generation element, the energization resistance is small. Furthermore, the internal terminal penetrates the through hole of the battery case and the through hole of the pole column terminal, protrudes into the internal space of the cylindrical portion of the pole column terminal, and is made larger than the diameter of the through hole of the pole column terminal. Has a protrusion. Accordingly, the battery case and the pole terminal are securely fixed by the protruding portion and the base end portion. Further, although the protruding portion is hollow, it is disposed in the internal space of the cylindrical portion of the pole post terminal, so there is no possibility of being pressed carelessly. Thereby, the inside and outside of the battery are electrically connected by a member having a projecting portion which is a hollow portion, and the sealed battery can prevent the hollow portion from being damaged.

Furthermore, in the present invention, it is desirable that a female screw is formed on the inner peripheral surface of the cylindrical portion of the pole post terminal.
If it becomes like this, a volt | bolt can be fastened to the internal thread. For example, if a bus bar is sandwiched between a bolt and a female screw and fastened, the bus bar can be easily attached. Accordingly, the batteries can be easily connected to each other, so that the battery has good productivity.

Furthermore, in the present invention, it is desirable that a flange portion projecting outward in the radial direction of the cylindrical portion is formed at an end portion opposite to the bottom surface of the cylindrical portion of the pole terminal.
If it becomes like this, a bus bar etc. can be mounted in the collar part. Therefore, the bus bar and the pole post terminal can be stably and reliably connected.

The present invention also provides an assembled battery having a plurality of batteries, a bus bar for connecting the batteries, and a fastening bolt for fastening the bus bar to the terminals of the batteries, each battery having a through-hole formed therein. A case, a power generation element housed in the battery case, a cylindrical portion having an internal thread formed on the inner peripheral surface, and a bottom surface provided at one end of the cylindrical portion, and a through hole in the bottom surface Formed on the outside of the battery case with the bottom surface facing the battery case, and an internal terminal connected to the power generation element inside the battery case. , A hollow protrusion projecting through the through hole of the battery case and the through hole of the pole terminal and projecting toward the internal space of the cylindrical portion, and the battery case together with the protrusion and located on the inner surface side of the battery case And a base end portion sandwiching the pole terminal Of protrusion portion that protrudes outwardly from the bottom surface of the pole terminals, together with located inside the cylindrical portion is intended maximum diameter is greater than the diameter of the through-hole of the pole terminals, busbar, a through hole Is formed, and is arranged in contact with the end of the cylindrical portion of the pole pole terminal opposite to the bottom surface. The fastening bolt penetrates the through hole of the bus bar and is pole pole terminal. A pair of bolts that are fastened to a female screw on the inner peripheral surface of the cylindrical portion and that have a length that contacts the protruding portion without damaging the protruding portion. It extends to batteries.

  According to the assembled battery of the present invention, the protruding portion is hollow, but is disposed in the inner space of the cylindrical portion of the pole column terminal, and a fastening bolt is fastened to the cylindrical portion of the pole column terminal. . That is, since the cylinder portion is sealed by the fastening bolt, there is no possibility that the other member contacts the protruding portion. Furthermore, since the fastening bolt is in contact with the protruding portion, the battery case and the pole pole terminal are securely clamped by the protruding portion. In addition, if the shape of the tip of the fastening bolt (the portion that contacts the protruding portion) is made to follow the shape of the protruding portion, breakage of the protruding portion can be more effectively prevented.

The present invention also includes a battery case member that has a through-hole and forms a part of the battery case, a power generation element, and a cylindrical portion and a bottom surface provided at one end of the cylindrical portion. A preparation step of preparing an electrode terminal having a hole and an internal terminal having a base end portion and a hollow projecting portion protruding from the base end portion; A superposition process in which the through-holes are arranged so that the through holes overlap each other on the outer surface side of the case, and the internal terminals are positioned on the inner surface side of the battery case member, and the protruding portion penetrates the battery case member. A projecting step of projecting through the hole and the through hole of the pole terminal and projecting toward the outer side of the battery case, and a portion of the projecting portion protruding outside the bottom surface of the pole terminal , By pressing toward the battery case , With located inside the cylindrical portion, the maximum diameter is deformed so as to be larger than the diameter of the through-hole of the pole terminal, pinching the battery case member and pole terminals between protrusions deforms the base end portion deforms The present invention also extends to a method of manufacturing a sealed battery having a process, a connecting process of connecting a portion of the internal terminal other than the protruding portion to the power generation element, and a storage process of storing the power generation element in the battery case.

  According to the sealed battery, the assembled battery, and the manufacturing method of the sealed battery of the present invention, the inside and outside of the battery are electrically connected by the member having the hollow portion, and the hollow portion is prevented from being damaged. can do.

It is a schematic sectional drawing which shows the battery which concerns on this form. It is sectional drawing which shows the terminal part of a battery. It is a top view which shows the shape of the internal terminal before mounting. It is sectional drawing which shows the shape of the internal terminal before mounting. It is sectional drawing which shows the assembly process of the terminal part of a battery. It is sectional drawing which shows the assembly process of the terminal part of a battery. It is a schematic sectional drawing which shows the state which connected the bus bar to the battery. It is a schematic sectional drawing which shows the state which connected the bus bar to the battery. It is sectional drawing which shows the terminal part of a cylindrical battery.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to a single battery cell of a sealed secondary battery such as a lithium ion secondary battery. Further, an assembled battery in which a plurality of single battery cells are connected will be described.

  A schematic configuration of the battery 10 of this embodiment is shown in a cross-sectional view of FIG. The battery 10 according to the present embodiment has a power generation element 15 housed in a battery case 13 formed by joining a case body 11 and a lid member 12. The battery case 13 is a flat rectangular metal case that is thin in the depth direction in the figure. The case main body 11 has a box shape with only one upper surface opened in the figure, and the opening portion is sealed with a lid member 12.

  The power generation element 15 of the battery 10 according to the present embodiment includes an electrode body 16 in which a strip-shaped electrode plate and a separator are overlapped and wound flatly, and a non-aqueous electrolyte solution 17. The strip-shaped electrode plate is a metal foil coated with an active material. Then, by leaving a part of the metal foil without applying the active material, the remaining part (uncoated part) can be used as an electrical connection part. That is, the electrode body 16 of this embodiment is formed with uncoated portions 18 and 19 of the positive electrode and the negative electrode on both sides in FIG.

  As shown in FIG. 1, the battery 10 of this embodiment has terminal portions 21 and 22 at both ends of the battery case 13. Inside the battery 10, the terminal portion 21 is connected to the uncoated portion 18, and the terminal portion 22 is connected to the uncoated portion 19. Further, the lid member 12 is formed with a through hole 23 at the terminal portion 21 and a through hole 24 at the terminal portion 22. The terminal portions 21 and 22 are for connecting the inside and outside of the battery 10, and have portions that protrude outward from the battery case 13 for external connection. The terminal portions 21 and 22 have substantially the same shape, and the terminal portion 21 will be described below as a representative.

  FIG. 2 shows an enlarged view of a part of the AA cross section of FIG. As shown in FIGS. 1 and 2, the terminal portion 21 includes a pole column terminal 30, an internal terminal 31, a seal member 32, and an insulating member 33. The internal terminal 31 has a hollow protruding portion 41 that protrudes outward from the battery case 13 through the through hole 23 formed in the lid member 12. The internal terminal 31 and the protruding portion 41 will be described later.

  The pole terminal 30 is a substantially bottomed cylindrical metal member having a cylindrical portion 34, a flange portion 35, and a bottom surface portion 36. A female screw 34 a is formed on the inner peripheral surface of the cylindrical portion 34. A through hole 36 a is formed in the bottom surface portion 36 of the pole terminal 30. The flange portion 35 is an annular seat surface that is formed so as to spread from the tip end portion (end portion far from the bottom surface portion 36) of the cylindrical portion 34 toward the outer side in the radial direction. The upper surface of the collar portion 35 is flat.

  The seal member 32 is a substantially ring-shaped member disposed along the inner peripheral surface of the through hole 23 of the lid member 12. A seal member 32 seals between the protrusion 41 and the lid member 12. Therefore, the inside of the battery case 13 is sealed. As the material of the seal member 32, rubber or a resin material having elasticity is suitable. The insulating member 33 is disposed between the lid member 12 and the pole column terminal 30 to insulate them. The insulating member 33 is formed of an insulating resin material or the like. The insulating member 33 and the pole terminal 30 are formed with drain holes 37 and 38 at one or more locations on the side surface.

  As shown in FIG. 2, the internal terminal 31 passes through the through hole 23 of the lid member 12 and the through hole 36 a of the pole column terminal 30 and extends in the radial direction of the hole on both sides thereof. A hollow protrusion 41 protrudes in these holes 23 and 36a and on the outer side of the battery case 13 from them. The tip portion 42 of the projecting portion 41 extends radially in the shape of a mushroom umbrella outside the through hole 36a. That is, the maximum diameter of the tip portion 42 outside the through hole 36a is larger than the diameter of the through hole 36a. Furthermore, the surface of the tip end portion 42 on the battery case 13 side is in contact with the bottom surface portion 36 of the pole column terminal 30 around the through hole 36a. Further, the outer surface of the tip portion 42 is convex outward. Note that the inside of the protrusion 41 is not a closed space, but is open to the inside of the battery case 13.

  A flat base end portion 43 is provided in the internal terminal 31 on the inner side of the battery case 13 from the through hole 23 of the lid member 12. The base end portion 43 is pressed against the inner surface of the battery case 13 in the lid member 12 via the seal member 32. That is, the internal terminal 31 sandwiches the lid 12 together with the seal member 32, the insulating member 33, and the pole terminal 30 by the base end portion 43 and the tip end portion 42. As a result, the internal terminal 31 is fixed to the lid member 12. Further, the lid member 12, the pole column terminal 30, the seal member 32, and the insulating member 33 are fixed by the internal terminal 31.

  Further, as shown in FIG. 2, an internal connection portion 44 is formed in the internal terminal 31 before the base end portion 43 that is a portion pressed against the lid member 12. That is, the distal end portion of the inner side of the battery case 13 with respect to the base end portion 43 of the internal terminal 31 is bent in accordance with the shape of the battery 10 and welded to the uncoated portion 18 of the electrode body 16 so as to be connected to the internal connection portion. 44. The uncoated portion 18 is gathered in the thickness direction of the electrode body 16 at this location and is in a dense state. The internal connection portion 44 of the internal terminal 31 sandwiches the uncoated portion 18 from the outside of the dense portion and is fixed by welding.

  Thus, the uncoated portion 18 of the battery 10 of the present embodiment is connected to the internal connection portion 44 of the internal terminal 31, and the protruding portion 41 of the internal terminal 31 is connected to the polar column terminal 30. That is, the pole terminal 30 functions as an external terminal of one pole (uncoated part 18) of the battery 10 of this embodiment. For example, if bolting to the cylindrical portion 34 of the pole terminal 30, particularly the female screw 34a, is used, it is easy to connect to other members.

  Further, the protruding portion 41 and the pole terminal 30 are insulated from the lid member 12 by a seal member 32 and an insulating member 33. Further, the through hole 23 of the lid member 12 is securely sealed by the seal member 32. Therefore, the battery 10 is a sealed battery.

  Next, a method for manufacturing the battery 10 of this embodiment will be described. The shape of the internal terminal 31 of this embodiment before mounting is shown in FIGS. FIG. 4 is a BB cross section of FIG. The internal terminal 31 is formed by pressing a metal plate into the illustrated shape. The protruding portion 41 is a portion that protrudes into a substantially cylindrical shape having an upper base, and the other portions are formed in a substantially flat plate shape continuously from the base end of the protruding portion 41.

  The outer diameter of the protrusion 41 before mounting is slightly smaller than the inner diameter of the through hole 23 of the lid member 12. Also, the left and right end portions 31a of the internal terminal 31 in FIG. 3 have a slightly smaller width (size in the vertical direction in the drawing) than the central portion 31b closer to the center. Further, a crease is formed between the both end portions 31a and the central portion 31b, and the both end portions 31a are bent to the side farther from the projecting portion 41 than the central portion 31b. Thus, when the base end portion 43 and the internal connection portion 44 are bent in a later step, the both end portions 31a are arranged closer to each other than the central portions 31b.

  3 and FIG. 4, the lid member 12 and the case main body 11, the power generation element 15, the pole terminal 30, the seal member 32, and the insulating member 33, which are part of the battery case 13, are prepared. To do. This is the preparation process.

  Next, as shown in FIG. 5, the sealing member 32, the lid member 12, the insulating member 33, and the pole column terminal 30 are disposed on the internal terminal 31 thus formed. For example, first, a ring-shaped sealing member 32 is fitted into the through-hole 23 of the lid member 12, and then the protruding portion 41 of the internal terminal 31 is penetrated into the sealing member 32 from the side that later becomes the inside of the battery. Let Further, the insulating member 33 and the pole column terminal 30 are fitted from the outside of the lid member 12.

  The procedure for fitting is not limited to this order. The protruding portion 41 of the internal terminal 31 passes through the through hole 23 of the lid member 12 and the through hole 36a of the pole terminal 30, and protrudes into the cylindrical portion 34. The insulating member 33 should just be arrange | positioned. This corresponds to the superposition process and the protrusion process.

  The pole terminal 30 fits inside the insulating member 33 and can pass the protruding portion 41 through the through hole 36a. In the example of this figure, the thickness of the portion of the sealing member 32 on the insulating member 33 side is larger than the thickness of the lid member 12. Further, the height of the portion of the seal member 32 that protrudes outward from the lid member 12 is equal to or greater than the thickness of the bottom surface of the insulating member 33. Therefore, the insulating member 33 and the pole terminal 30 are separated from each other simply by fitting these members, and the cover member 12 and the insulating member 33 are not pressed against each other. Thus, by arranging the internal terminal 31, the sealing member 32, the insulating member 33, and the pole column terminal 30 on both sides of the lid member 12, the state shown in FIG.

  The protrusion 41 of the internal terminal 31 prepared in this way is crushed toward the lid member 12 in the cylindrical portion 34 of the pole terminal 30 and is expanded in the radial direction. For example, by using a jig having a concave tip and pushing downward from above in FIG. 5, the tip 42 of the protrusion 41 is a curved surface having a convex outer surface as shown in FIG. Can be deformed. Accordingly, the distal end portion 42 can be expanded in the radial direction, and the base end side surface of the distal end portion 42 can be pressed against the bottom surface portion 36 of the polar column terminal 30.

  As a result, the maximum diameter of the tip portion 42 protruding outside the bottom surface portion 36 is deformed so as to be larger than the diameter of the through hole 36a. The lid member 12 and the pole terminal 30 are sandwiched between the distal end portion 42 and the proximal end portion 43 of the protruding portion 41 of the internal terminal 31. Thereby, the lid member 12 and the pole column terminal 30 are fixed by the internal terminal 31. This is a deformation process. In this embodiment, both the sealing member 32 and the insulating member 33 are sandwiched together with the lid member 12 and the pole column terminal 30. In this deformation step, the cover member 12 and the insulating member 33 are brought into close contact with each other when the seal member 32 is crushed.

  In this manner, the internal terminal 31, the pole terminal 30 and the like are attached to the through holes 23 and 24 of the lid member 12, respectively. Next, the two end portions 31a are bent so as to be on the side farther from the projecting portion 41 at the location indicated by the dotted line in FIG. Thereby, the periphery of the base end of the protrusion 41 remains as the base end portion 43. Further, an uncoated portion 18 of the electrode body 16 prepared separately is sandwiched between the bent end portions 31a and welded. This is the connection process.

  When the uncoated portions 18 and 19 of both electrodes of the electrode body 16 and the respective internal terminals are connected, the electrode body 16 is put into the case body 11 and the case body 11 and the lid member 12 are welded. Further, an electrolyte is injected from the injection port. Thereby, the power generation element 15 was stored in the battery case 13. This is the storing process. Further, the liquid injection port is closed, and the battery 10 is completed.

  In the battery 10 of this embodiment, the tip end portion 42 of the protruding portion 41 is disposed inside the cylindrical portion 34 of the pole post terminal 30. The protruding height of the tip portion 42 after being deformed from the lid member 12 is smaller than the rising height from the bottom surface portion 36 of the cylindrical portion 34. That is, the tip portion 42 does not protrude beyond the cylindrical portion 34, and is completely contained within the cylindrical portion 34.

  Furthermore, since the protruding portion 41 of the internal terminal 31 is in direct contact with the pole column terminal 30, the internal terminal 31 and the pole column terminal 30 are directly connected without any other member interposed therebetween. Further, since the pole terminal 30 is disposed immediately above the uncoated portion 18, the distance between the uncoated portion 18 and the pole terminal 30 is close, and the conduction resistance is small. Furthermore, since the protrusion 41 is hollow, it can be deformed with a relatively small force. It is not necessary to press at a large pressure like the conventional caulking. Therefore, the productivity is high and the cost is low.

  In the battery 10 of this embodiment, the internal terminal 31 has a hollow protruding portion 41, a base end portion 43 having a flat plate shape on the base end side, and an internal connection portion 44 on the side farther from the protruding portion 41 than the base end portion 43. have. Then, the protruding portion 41 protrudes outside the battery case 13 through the through hole 23 of the lid member 12 and the through hole 36 a of the pole column terminal 30. Furthermore, the tip part 42 which is a part outside the bottom part 36 (surface in which the through-hole 36a is formed) of the pole terminal 30 among the protrusions 41 is crushed so as to expand in the radial direction from the through-hole 36a. Yes. Therefore, the lid member 12 and the pole terminal 30 are sandwiched and fixed by the protruding portion 41 and the base end portion 43 of the internal terminal 31. Accordingly, the protrusion 41 is securely sealed. The internal connection portion 44 is directly connected to the uncoated portion of the electrode body 16. Accordingly, the energization resistance between the pole terminal 30 and the electrode body 16 is small.

  As described above in detail, in the battery 10 of this embodiment, the tip end portion 42 of the protruding portion 41 is covered with the cylindrical portion 34 of the pole column terminal 30 and disposed inside the cylindrical portion 34. Therefore, there is no possibility that the tip portion 42 of the protruding portion 41 is subject to interference from other members such as being carelessly pressed from the outside. Thereby, the breakage of the tip portion 42 which is a hollow portion is prevented.

  Next, the assembled battery 50 of this embodiment will be described. The assembled battery 50 according to this embodiment is obtained by connecting a plurality of completed batteries 10. For example, by arranging the two batteries 10 so that the surfaces of the large areas (surfaces that can be seen in the front when the battery 10 is oriented in FIG. 1) are adjacent to each other, the terminal portions 21 of the adjacent batteries 10, 22 can be placed very close. Therefore, it is possible to connect between the terminals of the two batteries 10 by bridging the bus bar between the terminal portions 21 and 22. Here, sectional views of an example in which the terminal portions 21 and 21 of the two batteries 10 are connected using the bus bar 51 are shown in FIGS. 8 is a cross-sectional view taken along the line CC of FIG. In FIG. 8, the two adjacent batteries 10 are shown slightly separated from each other, but they may be arranged close to each other until they come into contact with each other.

  The bus bar 51 of this embodiment is a metal flat plate. As shown in FIGS. 7 and 8, the bus bar 51 of this embodiment has two holes 52 having a diameter larger than the inner diameter of the female screw 34 a of the pole terminal 30 and smaller than the outer diameter of the flange 35. Yes. In the assembled battery 50 of this embodiment, the bus bar 51 is placed on the flange portion 35 of the pole column terminal 30 of the two batteries 10. The bus bar 51 is arranged so that the cylindrical portion 34 of the pole terminal 30 of each battery 10 overlaps the hole 52. A fastening bolt 53 is fastened to the female screw 34 a of the pole terminal 30 through the hole 52 from above in the drawing of the bus bar 51.

  As shown in FIGS. 7 and 8, the fastening bolt 53 is formed in such a length that its front end portion comes into contact with the front end portion 42 of the projecting portion 41 when it is tightened until its head comes into contact with the bus bar 51. Yes. Further, the distal end portion of the fastening bolt 53 is formed in a shape that follows the deformed shape of the distal end portion 42 of the protruding portion 41. Alternatively, at least in a state where the fastening bolt 53 is fastened, the tip of the fastening bolt 53 does not apply an excessive force to the tip 42 of the protrusion 41.

  Therefore, the fastening bolt 53 comes into contact with all of the bus bar 51, the pole post terminal 30, and the internal terminal 31 by being fastened to the female screw 34 a of the pole post terminal 30. That is, the bus bar 51 and the internal terminal 31 are electrically connected via the pole terminal 30 and the fastening bolt 53. From this, the conduction path length between the two connected batteries 10 is short, and the conduction resistance can be made small.

  Furthermore, by using the assembled battery 50, the distal end portion of the fastening bolt 53 comes into contact with the distal end portion 42 of the protruding portion 41, so that the distal end portion 42 is further crushed than in the state of the battery 10 alone. Therefore, the fixing of the lid member 12 and the pole post terminal 30 by the protruding portion 41 and the base end portion 43 is more reliable than in the case of the battery 10 alone. Further, the connection state between the internal terminal 31 and the pole terminal 30 is also reliable.

  Further, when the fastening bolt 53 is fastened to the pole terminal 30, the open end of the cylindrical portion 34 of the pole terminal 30 is sealed. Therefore, in the assembled battery 50, the tip end portion 42 of the protruding portion 41 is no longer exposed. Therefore, there is no possibility that the tip end portion 42 is subject to external interference, and the tip portion 42 is prevented from being damaged or deformed. In addition, since the tip of the fastening bolt 53 is in contact with the tip 42 of the protrusion 41, even when the internal pressure of the battery 10 rises after the use of the battery pack 50, the tip 42 of the protrusion 41 is not deformed. It is prevented and a good connection state can be secured. Further, since the cylindrical portion 34 of the pole terminal 30 surrounds the tip end portion 42 of the protruding portion 41, the fastening bolt 53 is also disposed immediately above the internal terminal 31. In addition, the outer dimensions of the bus bar 51 may be approximately the same as the outer dimensions of the flange 35. Therefore, the external terminal portion made of these members is within a small range directly above the internal terminal 31, so that the assembled battery 50 with good volume efficiency is obtained.

  As described above in detail, the assembled battery 50 of this embodiment has a small energization resistance because the fastening bolt 53 is fastened to the female screw 34a of the pole column terminal 30 of the battery 10. Further, the fastening bolt 53 further crushes the tip end portion 42 of the protruding portion 41 of each battery 10, so that the sealed state of the battery 10 is further ensured. Furthermore, since the fastening bolt 53 is fastened to the cylindrical portion 34 of the pole terminal 30, the breakage of the protruding portion 41 which is a hollow portion is prevented.

In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, in the above embodiment, the present invention is applied to the terminal shape of a rectangular battery, but it is of course possible to apply it to a cylindrical battery. For example, as shown in FIG. 9, the shape of the lid, the shape of the connection portion between the internal terminal and the electrode body, or the like may be changed in accordance with the shape of the battery. Any kind of electrode body 16 may be used. For example, the present invention can be applied not only to lithium ion secondary batteries but also to nickel hydride secondary batteries.

  Further, for example, the internal thread 34a is formed on the inner peripheral surface of the cylindrical portion 34 of the pole terminal. However, the outer shape of the portion where the internal thread 34a is formed is not limited to the cylindrical shape, and the cylindrical hole is formed in the rectangular column. May be formed. Further, not only the female screw but also a fixing method using a combination of a groove and a hook may be employed. Moreover, although the front-end | tip part 42 of the protrusion part 41 was made into the curved surface convex outside, it is not restricted to this. For example, even if it is crushed flat, the same effect can be obtained.

  Further, for example, the assembled battery may be any battery in which two or more single cells are connected, and includes a battery connected in series and a battery connected in parallel. An appropriate bus bar may be prepared in accordance with the number and arrangement of terminal portions connected to each other. Further, the insulation between the terminal portion and the battery case may be performed for only one of positive and negative. In addition, although separate members are used as the insulating member 33 and the seal member 32, it is possible to obtain a single member that combines these functions by selecting an appropriate material and shape.

DESCRIPTION OF SYMBOLS 10 Battery 13 Battery case 15 Electric power generation element 23 Through-hole 30 Polar pole terminal 31 Internal terminal 34 Cylindrical part 34a Female screw 35 Grow part 36 Bottom part 36a Through-hole 41 Protrusion part 43 Base end part 51 Bus bar 53 Fastening bolt

Claims (5)

A battery case in which a through hole is formed;
A power generating element housed inside the battery case;
A cylindrical portion and a bottom surface provided at one end of the cylindrical portion, the through hole is formed in the bottom surface, the bottom surface is directed to the battery case, and the through hole in the bottom surface is formed in the battery. A pole terminal disposed outside the battery case, overlaid on the through hole of the case;
An internal terminal connected to the power generation element inside the battery case;
The internal terminal is
A hollow projecting portion projecting through the through hole of the battery case and the through hole of the pole column terminal and projecting toward the internal space of the cylindrical portion;
The battery case is located on the inner surface side of the battery case, and has a base end portion sandwiching the battery case and the bottom surface of the pole post terminal together with the protruding portion,
A portion of the protruding portion that protrudes outside the bottom surface of the pole terminal is located inside the cylindrical portion, and has a maximum diameter larger than the diameter of the through hole of the pole terminal. Sealed battery. The sealed battery according to claim 1,
A sealed battery, wherein a female screw is formed on an inner peripheral surface of the cylindrical portion of the pole post terminal. The sealed battery according to claim 1 or 2,
A sealed battery characterized in that a flange projecting outward in the radial direction of the cylindrical portion is formed at an end of the cylindrical column terminal opposite to the bottom surface. In an assembled battery having a plurality of batteries, a bus bar connecting the batteries, and a fastening bolt for fastening the bus bar to a battery terminal,
Each battery
A battery case in which a through hole is formed;
A power generating element housed inside the battery case;
A cylindrical portion having an internal thread formed on an inner peripheral surface, and a bottom surface provided at one end of the cylindrical portion; a through hole is formed in the bottom surface; and the bottom surface is attached to the battery case. A pole pole terminal arranged outside the battery case,
An internal terminal connected to the power generation element inside the battery case;
The internal terminal is
A hollow projecting portion projecting through the through hole of the battery case and the through hole of the pole column terminal and projecting toward the internal space of the cylindrical portion;
A base end portion located on the inner surface side of the battery case, with the protruding portion and sandwiching the battery case and the pole terminal,
Of the protruding portion, the portion protruding outside the bottom surface of the pole terminal is located inside the cylindrical portion, and the maximum diameter is larger than the diameter of the through hole of the pole terminal,
The bus bar has a through-hole and is disposed in contact with an end portion on the opposite side to the bottom surface of the cylindrical portion of the pole terminal,
The fastening bolt penetrates the through hole of the bus bar and is fastened to a female screw on the inner peripheral surface of the cylindrical portion of the pole pole terminal, and the length of the portion entering the inside of the cylindrical portion is A battery assembly having a length that contacts the protrusion without damaging the protrusion. A through-hole is formed in the bottom surface having a battery case member forming a part of the battery case, a power generation element, a cylindrical portion, and a bottom surface provided at one end of the cylindrical portion. A preparatory step of preparing a pole terminal that is formed, and an internal terminal having a base end and a hollow protrusion protruding from the base end;
An overlaying step of arranging the pole pole terminals so that through holes overlap each other on the surface side of the battery case member that is outside the battery case;
The internal terminal is positioned at the base end on the inner surface side of the battery case member, and the protruding portion penetrates the through hole of the battery case member and the through hole of the pole post terminal and A projecting step for projecting toward the opposite side, and
By pressing a portion of the protruding portion that protrudes outside the bottom surface of the pole terminal toward the battery case member, the protruding portion is positioned inside the cylindrical portion and has a maximum diameter of the pole terminal. A deformation step in which the battery case member and the pole column terminal are sandwiched between the base end portion and the deformed protruding portion;
A connection step of connecting a portion other than the protruding portion of the internal terminal to the power generation element;
And a housing step of housing the power generation element in a battery case.

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