JP6641739B2 - Storage element - Google Patents

Description

  The present invention relates to a power storage device including a case and a conductive member.

  Electric storage elements such as batteries are used in vehicles such as hybrid vehicles (HEV), plug-in hybrid vehicles (PHEV), electric vehicles (PEV), electric motorcycles and electric assist bicycles, and stationary electric storage systems. I have. For example, a power storage element including an electrode body as a power generating element, a case accommodating the electrode body, a current collector electrically connected to the electrode body, and an external terminal is known.

  Patent Literature 1 describes a power storage element having mounting bolts for connecting a bus bar or the like to an electrode terminal, and fixing the current collector and the electrode terminal to a case using rivets.

JP 2013-73848 A

  However, when a force or vibration is applied to the external terminal or the current collector, a fixed portion of the current collector or the external terminal may be loosened. For example, the electrode body may vibrate due to vibration of a vehicle or the like, and this vibration may be transmitted to the fixed portion via the current collector. Further, when attaching a connection member such as a bus bar to the external terminal, a force may be applied to the fixed portion. If the fixing portion is loosened, the electric resistance (contact resistance) in the current path from the electrode body to the external terminal may increase even if the fixing of the member is not affected, which may result in deterioration of the battery quality.

  The present invention has been made to solve such a problem, and provides a high-quality power storage element in which a fixed portion between conductive members is not easily loosened even when force or vibration is applied. The purpose is to:

  An energy storage element according to one embodiment of the present invention is an electrode body including a positive electrode and a negative electrode, a case for housing the electrode body, a first conductive member, and electrically connected to one of the positive electrode or the negative electrode, A second conductive member that penetrates and fixes the case and the first conductive member, and an insertion member having a rod-shaped portion and a head, wherein the second conductive member has a hollow portion and a caulked portion; The rod portion is inserted into the hollow portion, and the head is in contact with the caulking portion.

  In the power storage element according to the above aspect, even when force or vibration is applied, the fixed portion between the conductive members does not easily loosen, and has high quality.

FIG. 1 is a schematic perspective view illustrating an external configuration of a power storage element according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram illustrating an internal configuration of a power storage element. FIG. 3 is a schematic developed perspective view showing a configuration of an electrode body. It is a schematic cross section which shows the structure of the fixed part by a rivet. FIG. 6A is a schematic cross-sectional view for explaining an operation by a screw, and FIG. 6B is a schematic cross-sectional view showing a rivet in a comparative example. FIG. 4 is a schematic development view showing a configuration related to fixing by rivets. FIG. 4 is a schematic developed view showing the connection between a rivet and a screw. (A) A schematic cross-sectional view showing a configuration around a rivet in a power storage element according to Embodiment 2 of the present invention, and (b) a schematic cross-sectional view showing a configuration around a rivet in a power storage element according to Embodiment 3 of the present invention. is there. (A) A schematic cross-sectional view showing a peripheral configuration of a rivet in a power storage element according to Embodiment 4 of the present invention, and (b) a schematic cross-sectional view showing a peripheral configuration of a rivet in a power storage element according to Embodiment 5 of the present invention. is there. FIG. 15 is a schematic cross-sectional view illustrating a configuration around a terminal in a power storage element according to Embodiment 6 of the present invention. FIG. 15 is a schematic cross-sectional view illustrating a configuration around a rivet in a power storage element according to Embodiment 7 of the present invention.

An energy storage element according to one embodiment of the present invention includes an electrode body, a case, a first conductive member, a second conductive member, and an insertion member.
The electrode body includes a positive electrode and a negative electrode.
The case houses the electrode body.
The second conductive member is electrically connected to one of the positive electrode and the negative electrode, and penetrates and fixes the case and the first conductive member.
The insertion member has a bar and a head.
The second conductive member has a hollow portion and a caulked portion, and the rod portion is inserted into the hollow portion. Further, the head is in contact with the swaged portion.

  In addition, "caulking" and "caulking" means that a part of the target member is plastically deformed by pressing (pressing), and "caulking part" means "plastically deforming by caulking". Means the portion formed by

  In the power storage device according to the above aspect, the rod portion of the insertion member is inserted into the hollow portion of the second conductive member, and the head of the insertion member is in contact with the swaged portion of the second conductive member. For this reason, even if force or vibration is applied to the swaged portion of the second conductive member, it is possible to apply a resistance to the loosening (deformation) movement of the swaged portion. Therefore, in the power storage element according to the above aspect, even when force or vibration is applied, the fixed portion between the conductive members does not easily loosen, and has high quality.

  In the power storage element according to one embodiment of the present invention, in the above configuration, a female screw is formed on at least a part of the inner wall of the hollow portion, and a male screw corresponding to the female screw is formed on at least a part of the outer wall of the rod-shaped portion. May be. In the case of employing the configuration by coupling the screws as described above, since the insertion member is fixed to the second conductive member, the head of the screw can reliably press down the swaged portion. Therefore, in this aspect, the fixed portion (caulked portion) is less likely to be loosened, which is advantageous for realizing high quality.

  In the power storage element according to one embodiment of the present invention, in the above structure, the head may have a frustum shape. By forming the head of the insertion member into a frustum shape, the caulked portion of the second conductive member can be pressed not only in the insertion direction of the insertion member but also in a direction crossing the insertion direction. Therefore, in this aspect, the swaged portion can be made harder to loosen, and high quality can be realized.

  In the power storage element according to one embodiment of the present invention, in the above structure, at least the second conductive member may be inserted at a position penetrating the first conductive member in the direction in which the rod-shaped portion is inserted into the hollow portion. . According to this structure, the rod-shaped portion of the insertion member can press the second conductive member against the first conductive member. Therefore, the swaged portion can be made harder to loosen, and high quality can be realized.

  The power storage element according to one embodiment of the present invention includes a sealing member which is provided in the case and through which the second conductive member penetrates, and at least the second conductive member is sealed in the rod-shaped portion in a direction of being inserted into the hollow portion. It may be inserted at a position penetrating the stop member. With such a configuration, airtightness can be further improved by the sealing member.

  In the power storage element according to one embodiment of the present invention, the above structure may further include a lid member. The lid member covers the head of the insertion member and is fixed to the first conductive member. By having such a cover member, the fixation of the insertion member can be strengthened, and the insertion member can be prevented from falling off from the second conductive member.

[Embodiment 1]
1. External Configuration of Battery 1 In the embodiment of the present invention, battery 1 is employed as an example of a power storage element. The external configuration of the battery 1 will be described with reference to FIG.
As shown in FIG. 1, the battery 1 includes a case 10 configured by a case body 102 having a rectangular tube shape with a bottom and a sealing body 101 that closes an opening thereof. The case body 102 and the sealing body 101 are joined at the outer peripheral portion of the sealing body 101 by, for example, laser welding.

  Two external terminals 11 and 12 are provided on the outer surface (front surface) of the sealing body 101. Each of the external terminals 11 and 12 protrudes outward from the case 10. The external terminals 11 and 12 are electrically connected to terminal connection bars 13 and 14, respectively. In the case of the present embodiment, the external terminal 11 is a positive external terminal, and the external terminal 12 is a negative external terminal.

  The terminal connection bars 13 and 14 are arranged along the outer surface (front surface) of the sealing body 101. The terminal connection bars 13 and 14 are both conductive members. Packings 15 and 16 are arranged between the sealing body 101 and the terminal connection bars 13 and 14, respectively. The packings 15 and 16 are insulating members. The terminal connection bars 13 and 14 are electrically insulated from the sealing body 101 by the packings 15 and 16.

  The terminal connection bars 13 and 14 are fixed to the case by rivets 17 to 20. Each of the rivets 17 to 20 penetrates the sealing body 101. Each of the rivets 17 to 20 is a conductive member, and is electrically insulated from the sealing body 101 by the packings 15 and 16. The rivet is an example of a second conductive member.

2. Internal Configuration of Battery 1 The internal configuration of the battery 1 will be described with reference to FIG.
FIG. 2 is a diagram of the battery 1 viewed from the Y direction in FIG. Here, the inside of the case main body 102 is shown in a see-through manner for convenience. As shown in FIG. 2, an electrode body 25 is housed inside the case 10 including the case body 102 and the sealing body 101. The electrode body 25 has a positive electrode 252, a negative electrode 253, and a separator 251.

For the electrode body 25, the current collector 21 is connected to a part of the positive electrode 252, and the current collector 22 is connected to a part of the negative electrode 253.
Each of the current collectors 21 and 22 is a conductive member, has an L-shape having a bent portion in a plan view, and a part thereof is along the inner surface (back surface) of the sealing body 101. The sealing body 101 and the current collectors 21 and 22 are electrically insulated by disposing insulating packings 23 and 24 therebetween. The current collector is an example of a first conductive member.

The rivets 17 and 18 penetrate the current collector 21 (only the rivet 18 is shown in FIG. 2), and the rivets 19 and 20 penetrate the current collector 22. (Only the rivet 20 is shown in FIG. 2). In FIG. 2, the detailed structure of the rivets 18 and 20 is simplified.
In this manner, the positive electrode 252 of the electrode body 25 is electrically connected to the external terminal 11 via the current collector 21, the rivets 17, 18, and the terminal connection bar 13. Similarly, the negative electrode 253 of the electrode body 25 is electrically connected to the external terminal 12 via the current collector 22, rivets 19 and 20, and the terminal connection bar.

Although not shown in FIG. 2, an electrolyte is sealed in the case 10 in addition to the electrode body 25. In the present embodiment, a non-aqueous electrolyte is sealed as an example.
Although only one electrode body 25 is illustrated in FIG. 2, a plurality of electrode bodies 25 (for example, two) may be accommodated in the case 10.

3. Configuration of Electrode Body 25 The configuration of the electrode body 25 will be described with reference to FIG.
As shown in FIG. 3, the electrode body 25 included in the battery 1 according to the present embodiment has a positive electrode 252, a negative electrode 253, and a separator 251. The positive electrode 252, the negative electrode 253, and the separator 251 are each a belt-shaped sheet body. The positive electrode 252 and the negative electrode 253 are opposed to each other with the separator 251 interposed therebetween, and are wound around the virtual axis Ax25. Electrode body 25 provided in battery 1 according to the present embodiment has a flat shape. Further, electrode body 25 included in battery 1 according to the present embodiment has a substantially elliptical cross-sectional shape in a plane perpendicular to virtual axis Ax25.

The positive electrode 252 and the negative electrode 253 each have an active material layer formed on a core. At one edge in the width direction (X-axis direction in FIG. 3) of the positive electrode 252, a core portion 252a on which the active material layer is not formed is provided. The active material forming portion 252 b on which the active material layer is formed is covered with the separator 251.
Similarly, a core portion 253a is provided on one edge in the width direction (X-axis direction in FIG. 3) of the negative electrode 253. The active material forming portion 253b is covered with the separator 251.

Positive electrode 252 is connected to current collector 21 at its core portion 252a, and negative electrode 253 is connected to current collector 22 at its core portion 253a.
In the case of the present embodiment, the core of positive electrode 252 is made of aluminum (Al), for example, and the core of negative electrode 253 is made of copper (Cu), for example.

4. Configuration of each fixed portion by rivets 17 to 20 The configuration of each fixed portion by rivets 17 to 20 will be described with reference to FIG. FIG. 4 is a schematic enlarged view of a portion B in FIG. Further, FIG. 4 shows only the fixed portion by the rivet 18, but each of the fixed portions of the other rivets 17, 19, and 20 has the same configuration.

  As shown in FIG. 4, the rivet 18 penetrates a part of each of the terminal connection bar 13, the packing 15, the sealing body 101, the packing 23, and the current collector 21. As described above, the rivet 18 and the sealing body 101 are electrically insulated by the packings 15 and 23 made of an insulating member.

  The rivet 18 is caulked at upper and lower ends (in the Z-axis direction in FIG. 4), and fixes the terminal connection bar 13 and the current collector 21 to the sealing body 101. Although there is no particular limitation on a specific method of the caulking, for example, spinning caulking can be employed. When caulking the rivet 18, the packing 15 and 23 are pressed by expanding the diameter of the rivet 18, and the airtightness in the case 10 is ensured.

  In the terminal connection bar 13, a region surrounding the penetrating portion of the rivet 18 is covered by a caulking portion 18 a of the rivet 18. Similarly, in the current collector 21, a region surrounding the penetrating portion of the rivet 18 is covered by the swaged portion 18 b of the rivet 18. The rivet 18 has hollow portions 18c and 18d. The hollow portions 18c and 18d are surrounded by caulking portions 18a and 18b, respectively, as viewed from the direction in which the rivet 18 penetrates the sealing body 101 (the Z-axis direction in FIG. 4). A screw 26 as an insertion member is inserted into the hollow portion 18d.

  The screw 26 has a bar 26a and a head 26b. In the rivet 18, a female screw is formed on the inner wall of the hollow portion 18d, and a male screw corresponding to the female screw is formed on the outer wall of the rod-like portion 26a of the screw 26. Although a male screw is shown in FIG. 4 for the sake of convenience, the male screw is not necessarily formed inside (in cross section) of the rod-shaped portion 26a. The screw 26 is inserted into the hollow portion 18d, and is connected with a male screw and a female screw. The head 26b of the screw 26 has a frustum shape, and a side surface (outer peripheral surface) is inclined. Most of the screw 26 is housed in the hollow portion 18d of the rivet 18. The side surface (outer peripheral surface) of the head 26b is in contact with the caulking portion 18b.

A cover 27 serving as a lid member is provided for the rivet 18 and is fixed to the current collector 21. The cover 27 covers the head 26b of the screw 26. The provision of the cover 27 can prevent the screws 26 from falling off or loosening. Further, the screw 26 and the cover 27 may be fixed, and in this case, the screw 26 can be more securely prevented from loosening.
Various materials can be used for the screws 26 and the cover 27, respectively. For example, it may be made of a metal or a resin, and may have both a metal part and a resin part. Various methods can be used for fixing the cover 27. For example, when the cover 27 is made of metal, the cover 27 can be welded to the current collector 21 and the screws 26. Note that a configuration without the cover 27 may be adopted.

5. Operation by Screw 26 As shown in FIG. 5A, the swaged portion 18b of the rivet 18 is pushed outward from the hollow portion by caulking, and is plastically deformed. When a force or vibration is externally applied to the battery 1 having such a configuration, a force or vibration is applied to each of the rivets 17 to 20 via the terminal connection bars 13 and 14 and the current collectors 21 and 22. Vibration may be transmitted. Here, since the head 26b is in contact with the caulking portion 18b, the screw 26 can apply a force as shown by an arrow in FIG. 5B from the head 26b toward the caulking portion 18b. Therefore, deformation and loosening of the caulking portion 18b due to external force and vibration can be prevented.

  In the present embodiment, the screw 26 is adopted as an example of the insertion member. Since the male screw inserted into the hollow part 18d of the rivet 18 meshes with the female screw formed on the inner wall of the hollow part 18d, the screw 26 is firmly fixed to the rivet 18. Therefore, the contact state between the head portion 26b of the screw 26 and the swaging portion 18d can be maintained, and the deformation (looseness) of the swaging portion 18b in the direction opposite to the arrow in FIG. be able to.

  The screw 26 according to the present embodiment is inserted into the hollow portion 18d in the Z-axis direction in FIG. The tip (the end opposite to the head 26b) of the screw 26 is located outside (the plus direction of the Z axis in FIG. 5A) than the outer surface (front surface) of the sealing body 101. On the inner wall of the rivet 18, a female screw is formed at a position where the rivet 18 penetrates the current collector 21, and the male screw of the screw 26 meshes. Therefore, more reliable electrical connection between the rivet 18 and the current collector 21 at this position can be achieved.

  On the inner wall of the rivet 18, a female screw is formed at a position where the rivet 18 penetrates the sealing body 101, and a male screw of the screw 26 is engaged. At a position where the rivet 18 penetrates the sealing body 101, the packing 15 is arranged between the sealing body 101 and the rivet 18. Therefore, a gap is hardly generated between the packing 15 and the rivet 18 and the sealing body 101, and higher airtightness can be secured.

  Furthermore, since the battery 1 is provided with the cover 27 and covers the head 26b of the screw 26, the screw 26 can be prevented from moving inward of the case 10 during use of the battery 1 or the like. Therefore, loosening of the screw 26, deformation of the caulked portion 18b, and dropping of the screw 26 into the case 10 can be reliably suppressed.

  On the other hand, as shown in FIG. 5B, in the structure according to the comparative example, the insertion member is not inserted into the hollow portion 918d of the rivet 918. When an external force or vibration is applied, the force or vibration is transmitted to the caulking portions 918a and 918b, and is easily deformed in the direction of an arrow in FIG. Will rise.

In the case of the configuration of the comparative example, when the caulking portion 918b is loosened, the rivet 918 also deforms and moves in the Z-axis direction in FIG. 5B, and the caulking portion 918a becomes loose (deformation toward the hollow portion 918c). There is a concern that this will also occur. Further, when the caulking portions 918a and 918b are loosened due to the application of force or vibration from the outside, there is a concern that a failure in electrical connection between the rivet 918 and the terminal connection bar 913 or the current collector 921 may occur. You. Further, a gap may be formed between the packing 918 and the sealing body 9101, the packing 923, or the like, which may cause a decrease in airtightness.
On the other hand, in the battery 1 according to the present embodiment, as described above, even when a force or vibration is applied from the outside, the loosening and deformation of the caulked portion of the rivet can be suppressed, and high quality is maintained. be able to.

6. Manufacturing Method The battery 1 is generally manufactured through the following steps.
(Step a) The electrode body 25 is manufactured. As shown in FIG. 3, the electrode body 25 is manufactured by opposing the positive electrode 252 and the negative electrode 253 with the separator 251 interposed therebetween, winding this, and further flattening.
(Step b) External terminals 11 and 12, terminal connection bars 13 and 14, current collectors 21 and 22, rivets 17 to 20, packings 15, 16, 23, and 24 are attached to the sealing body 101. Then, the screws 26 are inserted into the hollow portions of the rivets 17 to 20 inside the case, and the cover 27 is attached. Further, the electrode body 25 is connected to the current collectors 21 and 22.
(Step c) The electrode body 25 attached to the sealing body 101 is housed in the case body 102. Then, the case body 102 and the sealing body 101 are joined by, for example, laser welding or the like.
(Step d) The electrolyte is injected from the injection port opened in the case 10, and then the injection port is closed to complete the battery 1.
Note that part of the step b may be performed after the execution of the step c.

(Method of assembling fixed parts with rivets 17 to 20)
The configuration of the fixed portion by the rivets 17 to 20 will be described with reference to FIGS. Although FIGS. 6 and 7 show only the steps related to the fixing of the rivets 18, the steps related to the fixing of the other rivets 17, 19, and 20 are the same.

  As shown in FIG. 6, a part of each of the packing 15 and the rivet 180 is inserted into the through hole 101a opened in the sealing body 101. In the rivet 180, a female screw provided on the inner wall of the hollow portion is not shown. The packing 15 is provided with a space 15a into which the flange portion 180f of the rivet 180 is inserted and a space 15b into which the lower cylindrical portion 180b is inserted. The space 15a and the space 15b are continuous with each other. The lower surface 180h of the flange portion 180f of the rivet 180 contacts the shelf-like surface 15d of the packing 15. The sealing member 101 and the lower cylindrical portion 180b of the rivet 180 are electrically insulated by disposing the cylindrical portion 15c of the packing 15 between them.

The upper cylindrical portion 180a of the rivet 180 passes through a through hole 13c provided in the terminal connection bar 13. At this time, the upper end of the upper cylindrical portion 180a of the rivet 180 is located above the terminal connection bar 13 (the Z-axis plus direction in FIG. 6). The lower surface of the terminal connection bar 13 contacts the upper surface 180g of the flange portion 180f of the rivet 180.
The lower cylindrical portion 180b of the rivet 180 passes through a through hole 23b provided in the packing 23 and a through hole 21c provided in the current collector 21.
The upper surface of the current collector 21 contacts the inner surface 23c of the packing 23. The lower end of the lower cylindrical portion 180b of the rivet 180 is located lower than the current collector 21 (in the minus direction of the Z axis in FIG. 6).

  After assembling as described above, the upper cylindrical portion 180a and the lower cylindrical portion 180b of the rivet 180 are subjected to, for example, spinning caulking, and the end of the peripheral wall surrounding the hollow portion 180c of the upper cylindrical portion 180a of the rivet 180. The terminal connection bar 13 and the current collector 21 are fixed to the sealing body 101 by plastically deforming the end and the end of the peripheral wall surrounding the hollow portion 180d of the lower cylindrical portion 180b.

  Next, as shown in FIG. 7, the screw 26 is inserted into the hollow portion 18d of the rivet 18. A female screw is formed in the hollow portion 18d. The screw 26 has a bar-shaped portion 26a formed with a male screw, and a side surface (outer peripheral surface) of the head portion 26b forms a slope 26c. The rod 26a and the head 26b of the screw 26 are inserted into the hollow 18d. The slope 26c of the head 26b contacts the caulking portion 18b of the rivet 18. Thereafter, the cover 27 is attached so as to cover the head 26b of the screw 26. For example, the cover can be welded to the current collector 21 and the screw 26.

  In the present embodiment, since the terminal connection bars 13 and 14 and the current collectors 21 and 22 are attached to the sealing body 101, work efficiency during manufacturing can be increased, and manufacturing costs can be reduced. However, these can be attached to the case main body 102 of the case 10.

[Embodiment 2]
The configuration of the battery according to Embodiment 2 will be described with reference to FIG. FIG. 8A illustrates only the rivet 28 and its peripheral configuration, which are different from the first embodiment. Other configurations are the same as those in the first embodiment.

  In the battery according to the present embodiment, as shown in FIG. 8A, a female screw is formed on the inner wall of the hollow portion 28j of the rivet 28. The hollow portion 28j is located outside the case 10. A screw 29 is inserted into the hollow portion 28j. In the screw 29, a male screw corresponding to the female screw of the hollow portion 28j is formed on the outer wall of the rod portion 29a. The head 29b of the screw 29 has a frustum shape like the head 26b of the screw 26 according to the first embodiment, and the side surface (outer peripheral surface) forms a slope.

  According to the configuration according to the present embodiment, even when a force or vibration is applied from the outside, loosening of the swaged portion 28a of the rivet 28 can be reliably suppressed. Therefore, high quality of the power storage element can be maintained.

  In the present embodiment, the insertion member is not inserted into the hollow portion 28d inside the case. This embodiment may be adopted, for example, when a large force or vibration is not applied to the current collector 21, or even when the current collector 21 is applied, the swaging portion 28b is unlikely to be loosened. A female screw may be formed on the inner wall of the hollow portion 28d.

  In the present embodiment, no cover is provided to cover the head 29b of the screw 29. With such a configuration, even if the screw 29 is loosened, the loosened screw can be visually recognized from the outside. It is also possible to retighten the screw 29. Therefore, it is possible to prevent an increase in electric resistance (contact resistance) while suppressing an increase in the number of components. Note that a configuration in which a cover is attached may be adopted.

[Embodiment 3]
The configuration of the battery according to Embodiment 3 will be described with reference to FIG. FIG. 8B illustrates only the rivet 30 and its peripheral configuration, which are different from the first embodiment. Other configurations are the same as those in the first embodiment.

  In the battery according to the present embodiment, a female screw is formed on the inner wall of the hollow portion 30d inside the case of the rivet 30 as in the first embodiment. A screw 31 is inserted into the hollow portion 30d, and a cover 32 is attached so as to cover the head 31b. Like the screw 26 of the first embodiment, the screw 31 has a bar-shaped portion 31a formed with a male screw and a head 31b having a frustum shape. In the screw 31, the side surface (outer peripheral surface) of the head 31b forms a slope, and the slope contacts the swaged portion 30b.

  In the battery according to the present embodiment, a female screw is formed on the inner wall of hollow portion 30j of rivet 30 outside the case. A screw 33 is inserted into the hollow portion 30j, as in the second embodiment. On the outer wall of the rod 33a of the screw 33, a male screw corresponding to the female screw of the hollow portion 30j is formed. The head 33b of the screw 33 has a frustum shape like the head 29b of the screw 29 according to the second embodiment. In the screw 33, the side surface (outer peripheral surface) of the head portion 33b forms a slope, and the slope contacts the swaging portion 30a.

  In the present embodiment, screws 31 and 33 are inserted into hollow portions 30d and 30j, respectively, and are in contact with caulking portions 30b and 30a, respectively. For this reason, in the battery according to the present embodiment, even when force or vibration is applied from the outside, loosening of both of the caulking portions 30a and 30b of the rivet 30 can be reliably suppressed. Therefore, high quality can be maintained.

  In the present embodiment, the configuration in which the cover 32 is attached to the screw 31 and the cover is not attached to the screw 33 is described. 32 may not be attached.

[Embodiment 4]
The configuration of the battery according to Embodiment 4 will be described with reference to FIG. FIG. 9A illustrates only the screw 34 and its peripheral configuration, which are different from the first embodiment. Other configurations are the same as those in the first embodiment.

  In the battery according to the present embodiment, a screw 34 having a shape different from that of the first embodiment is inserted into hollow portion 18d of rivet 18. A male screw is provided on the outer wall of the rod portion 34a of the screw 34. The head 34b of the screw 34 has a columnar shape. As shown in FIG. 9A, the head 34b is not inserted into the hollow portion 18d, but is in contact with the caulking portion 18b. The head 34b of the screw 34 is covered with a cover 35. Note that a configuration without the cover 35 may be adopted.

  In the battery according to the present embodiment, head portion 34b of screw 34 sandwiches caulking portion 18b, so that loosening and deformation of caulking portion 18b can be suppressed. Therefore, high quality can be maintained even when a force or vibration is applied from the outside. In the present embodiment, the shape of the head 34b of the screw 34 does not necessarily have to be a columnar shape, but may be, for example, a polygonal columnar shape, as long as the crimped portion 18b can be sandwiched therebetween.

[Embodiment 5]
The configuration of the battery according to Embodiment 5 will be described with reference to FIG. FIG. 9B illustrates only the rivet 36 and its peripheral configuration, which are different from the first embodiment. Other configurations are the same as those in the first embodiment.

  As shown in FIG. 9B, a pin 37 is inserted into the hollow portion of the rivet 36. Unlike the first embodiment, no female screw is formed on the inner wall surrounding the hollow portion of the rivet 36. The pin 37 has a bar 37a and a head 37b formed integrally with each other, and no male screw is formed on the outer wall of the bar 37a. The head 37b of the pin 37 has a frustum shape like the head 26b of the screw 26 according to the first embodiment, and is in contact with the caulking portion 36b of the rivet 36. The rod-shaped portion 37a has a columnar shape, and its diameter is larger than the diameter of the hollow portion of the rivet 36 before insertion. By inserting such a pin 37 into the hollow portion of the rivet 36, the inner wall of the hollow portion is pressed by the pin, and the pin 37 is fixed to the rivet 36. The head 37 b of the pin 37 is covered with a cover 38. Note that a configuration in which the cover 38 is not provided may be adopted.

  In the battery according to the present embodiment, since the pin 37 is used instead of the screw, it is not necessary to form a female screw in the hollow portion of the rivet. Therefore, loosening and deformation of the caulking portion 36b can be suppressed while using a conventional rivet.

  Further, in the present embodiment, the configuration in which the rod-shaped portion 37a has a columnar shape is shown, but the rod-shaped portion 37a may be formed in a polygonal columnar shape, and may be in a polygonal pyramid shape, a conical shape, or an elliptical cone shape. Similarly, the hollow portion of the rivet 36 may be a cylindrical space, a polygonal column, a polygonal pyramid, a cone, or an elliptical cone. If the hollow portion of the rivet 36 is formed as a tapered space whose diameter becomes smaller toward the center of the rivet 36, the pin 37 can be fixed to the rivet 36 while facilitating insertion. The shape of the head 37b of the pin 37 may be the same as the shape of the head 34b of the screw 34 according to the fourth embodiment.

Embodiment 6
The configuration of the battery according to Embodiment 6 will be described with reference to FIG. FIG. 10 illustrates only the terminal 39 and its peripheral configuration, which are different from the first embodiment. Other configurations are the same as those in the first embodiment.

  The battery according to the present embodiment does not have a terminal connection bar, and current collector 43 is connected to terminal 39. The terminal 39 penetrates the sealing body 101 and the current collector 43, and a male screw 39a is formed in a part located outside the case. The portion where the male screw 39a is formed corresponds to the external terminal in the first embodiment, and a bus bar or the like can be attached. Further, the packing 41 arranged on the sealing body 401 has a shape conforming to the shape of the terminal 39.

  In the terminal 39 according to the present embodiment, an end disposed inside the case is caulked (caulking portion 39b). The caulking portion 39b is a portion of the rivet 39 which is formed by plastically deforming a portion surrounding the vicinity of the opening of the hollow portion 39e. The packing 42 is arranged between the sealing body 401 and the current collector 43. The sealing body 401 and the current collector 43 are electrically insulated from each other.

  The terminal 39 has a hollow portion 39e, and a female screw is formed on an inner wall surrounding the hollow portion 39e. A screw 44 is inserted into the hollow portion 39e. The screw 44 has a male screw portion 44a and a head portion 44b formed integrally. The head 44b has a frustum shape. In the screw 44, a side surface (outer peripheral surface) of the head portion 44b forms a slope, and the slope contacts the caulking portion 39b. Note that a cover 45 is attached so as to cover the head 44b of the screw 44.

  In the present embodiment, the terminal connection bar can be omitted. In such a structure, when a component such as a bus bar is attached to the male screw 39a, the force and vibration applied to the male screw 39a are easily transmitted to the caulking portion 39b. Even in such a case, according to the configuration of the present embodiment, loosening and deformation of the swaged portion 39b can be suppressed. In the present embodiment, the male screw 39a does not necessarily have to be formed, and it is sufficient that the male screw 39a is configured so that a bus bar or the like can be fixed to a part of the terminal 39 outside the case.

Embodiment 7
The structure of the battery according to Embodiment 7 will be described with reference to FIG. FIG. 11 shows only the rivet 18 and its peripheral configuration. In the battery according to the present embodiment, the configuration in which the screw 26 is inserted into the rivet 18 and the hollow portion 18e thereof is the same as in the first embodiment.

  In the present embodiment, a part of the head part 26b of the screw 26 and a part of the caulking part 18b of the rivet 18 are welded (weld part 46). In the present embodiment, the cover that covers the head 26b of the screw 26 is not provided and the welded portion 46 is provided to prevent the screw 26 from loosening and falling off. Therefore, even when force or vibration is applied from the outside, loosening or deformation of the swaging portion 18b can be suppressed while suppressing an increase in the number of parts. Note that, instead of the screw 26, the screw described in the fourth embodiment or the pin described in the fifth embodiment may be used. Further, instead of rivet 18, terminal connection bar 13, and external terminal 11, the terminal described in the sixth embodiment may be employed.

[Other matters]
In the above embodiment, as an example of the power storage element, the battery 1 having a rectangular tube-shaped appearance is adopted. However, the storage element according to the present invention is not limited to such a battery. For example, regarding the external shape, a power storage element having a cylindrical external appearance, a power storage element having an external appearance such as a button shape, and a power storage element having an external body made of a laminate sheet and having a flat external shape are used. You can also.

Further, in addition to a lithium ion battery, a battery such as a nickel cadmium secondary battery or a nickel hydride secondary battery, or a capacitor such as an electric double layer capacitor or a lithium ion capacitor can be employed as the power storage element.
Further, in the above embodiment, a so-called wound electrode body is adopted as the electrode body 25, but the form of the electrode body is not limited to this. For example, an electrode body having a stacked structure in which a positive electrode and a negative electrode are alternately stacked with a separator interposed therebetween can be used.

  Further, in the above-described embodiment, as a method of fixing the rivets 17 to 20, 28, 36 and the terminals 39 to the terminal connection bars 13, 14 and the current collectors 21, 22, 43, the spinning caulking is employed as an example. The invention is not so limited. Various methods can be employed as long as the method is a processing method in which pressure is applied to the rivet to cause plastic deformation. For example, V caulking, pigeon caulking, burring caulking, dowel caulking, and the like can be employed, and plastic working in a heated state is also possible.

  The objects to be fixed with the rivets 17 to 20, 28, 30, 36 and the terminals 39 are not limited to the terminal connection bars 13, 14 and the current collectors 21, 22, 43, but may include the positive and negative electrodes and the external terminals. Any suitable conductive member can be used as long as it is a conductive member existing in an electric path between the two. For example, when an intermediate conductive member is arranged between the current collector and the rivet, the above configuration can be employed for fixing between the rivet and the intermediate member. The same applies to the electric path between the rivet and the external terminal.

  In the above embodiment, the rivets and the terminals are configured to penetrate the sealing body. However, it is not always necessary to penetrate the sealing body. For example, it may be configured to penetrate a part of the outer wall of the case main body 102. When a configuration penetrating through the sealing body is adopted, the workability during manufacturing is excellent.

  Further, in the above-described embodiment, the configuration in which the internal thread is formed on the inner surface (the surface in the Y-axis direction in FIGS. 4 to 11) on the inner wall of the hollow portion of the rivet or the terminal is shown. A configuration in which a female screw is formed at the deepest portion (bottom portion) may be employed.

  INDUSTRIAL APPLICABILITY The present invention is particularly useful for improving the quality of a power storage element for applications in which vibration or force is applied during use, such as a vehicle or a mobile device.

1. Battery 10. Cases 11 and 12. External terminal 39. Terminal 13,14. Terminal connection bar 15, 16, 23, 24, 41, 42. Packing 17-20, 28, 30, 36, 180. Rivet 21, 22, 43. Current collector 25. Electrode body 26, 29, 31, 33, 34, 44. Screw 27, 32, 35, 38, 45. Cover 37. Pin 46. Welds 101, 401. Sealing body 102. Case body 251. Separator 252. Positive electrode 253. Negative electrode

Claims (6)

An electrode body including a positive electrode and a negative electrode,
A case accommodating the electrode body,
A first conductive member;
A second conductive member electrically connected to one of the positive electrode or the negative electrode and penetrating and fixing the case and the first conductive member;
An insertion member having a rod-shaped portion and a head,
With
The second conductive member has a hollow portion and a caulked portion,
The rod portion is inserted into the hollow portion,
The power storage element, wherein the head is in contact with the caulking portion. At least a part of the inner wall of the hollow portion is formed with a female screw,
The power storage device according to claim 1, wherein a male screw corresponding to the female screw is formed on at least a part of an outer wall of the rod-shaped portion. The power storage device according to claim 1, wherein the head has a frustum shape. The power storage device according to any one of claims 1 to 3, wherein the rod-shaped portion is inserted at least at a position where the second conductive member penetrates the first conductive member in a direction in which the rod-shaped portion is inserted into the hollow portion. element. A sealing member disposed in the case and penetrated by the second conductive member;
The power storage device according to any one of claims 1 to 4, wherein the rod-shaped portion is inserted at least at a position where the second conductive member penetrates the sealing member in a direction inserted into the hollow portion. . The power storage device according to claim 1, further comprising a cover member that covers a head of the insertion member and is fixed to the first conductive member.

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