JP2015049959A - Power storage element, power supply module, support body, and exterior package of power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress expansion of an electrode body in an exterior package of a power storage element and stably hold the electrode body against vibrations and impacts from outside.SOLUTION: A nonaqueous electrolyte secondary battery 1 includes: an electrode body 11; an exterior package constituted by a lid part 20 and a container body 10 that houses the electrode body 11; and a support body 13 that supports the electrode body 11 and is fixed to the inside of the exterior package by being fitted with a salient 20b1 of the lid part 20 as a part of an inner wall of the exterior package and a salient 10y1 of an inner bottom 10y of the container body 10.

Description

  The present invention relates to a power storage element such as a secondary battery and other batteries, a power supply module using the same, a holding body used in the power storage module, and an exterior body of the power storage element.

  Secondary batteries are widely used as power sources for electronic devices such as mobile phones and IT devices, as well as for replacing primary batteries. In particular, a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery has a high energy density, and is therefore being applied to industrial large electric devices such as electric vehicles.

  A non-aqueous electrolyte secondary battery generally includes an electrode body and an electrolytic solution formed by laminating or winding positive and negative electrode plates separated by a microporous membrane separator inside a metal exterior body having conductivity. Further, the electrode body is connected to an electrode terminal provided on the surface of the exterior body through a current collector. Further, for the purpose of suppressing the expansion of the electrode body, the electrode body is enclosed in an exterior body in a state of being surrounded by a retainer or other protective member (see, for example, Patent Document 1 and FIG. 2).

JP 2012-054236 A

  Such conventional non-aqueous electrolyte secondary batteries have the following problems. That is, in the nonaqueous electrolyte secondary battery exemplified in Patent Document 1, the electrode body is enclosed in the exterior body in a state of being double-covered by the exterior body and the protective member. It is fixed to the inside of the exterior body through a current collector in a state integrated with the protective member.

  Therefore, when vibration or impact is applied to the exterior body, the electrode body swings or vibrates in a state where the weight of the protective member is further applied to its own weight, and the current collector and other electrode bodies are connected to the electrode terminal. There was a risk of stress being concentrated on the part, and eventually causing damage.

  In order to prevent such a problem, it is conceivable to reduce the clearance between the protective member and the exterior body by bringing the outer shape of the protective member closer to the inner shape of the exterior body, but the volume of the protective member occupies the volume of the exterior body. This may increase the pressure required for the storage of the components of the electrolytic solution, causing a decrease in electric capacity and other battery performance.

  The present invention has been made in view of the above problems, and can suppress the expansion of the electrode body in the exterior body and can stably hold the electrode body against vibration and impact from the outside. It is an object of the present invention to provide a power storage device, a power supply module using the power storage device, a holding body used in the power storage device, and an exterior body of the power storage device.

In order to achieve the above object, the first aspect of the present invention provides:
An electrode body;
An exterior body that houses the electrode body;
A holding body for holding the electrode body, which is fixed in the exterior body by being combined with a part of the inner wall of the exterior body,
It is a power storage element.

The second aspect of the present invention is
The exterior body has two exterior members,
The holding body is fixed in the exterior body by fitting with each inner wall of the two exterior members as the part of the inner wall of the exterior body.
It is an electrical storage element of the 1st side surface of this invention.

The third aspect of the present invention is
The holding body restrains the electrode body by being formed so as to surround the electrode body.
It is an electrical storage element of the 1st or 2nd side surface of this invention.

The fourth aspect of the present invention is
The other part of the inner wall of the exterior body is deformed corresponding to the surface shape of the electrode body,
The other part of the holding body and the exterior body is formed so as to surround the electrode body, thereby restraining the electrode body.
It is an electrical storage element of the 1st or 2nd side surface of this invention.

The fifth aspect of the present invention provides
The holding body has two holding members, and the two holding members are respectively fitted to the part of the inner wall of the exterior body.
It is an electrical storage element of any one of the 1st to 4th side of the present invention.

The sixth aspect of the present invention provides
The holding body has two holding members,
One of the two holding members is fitted to the part of the inner wall of the exterior body,
The other of the two holding members is sandwiched between another part of the inner wall of the exterior body and the electrode body,
It is an electrical storage element of the 1st to 5th side surface of this invention.

The seventh aspect of the present invention is
The part of the inner wall of the exterior body protrudes,
The holding body has a recess corresponding to the part of the inner wall,
It is an electrical storage element of the 1st to 6th side surface of this invention.

The eighth aspect of the present invention provides
The electrode body is pressed from the inner wall of the exterior body through the holding body,
It is an electrical storage element of the 1st to 7th side surface of this invention.

The ninth aspect of the present invention provides
A plurality of power storage elements including at least one power storage element according to any one of the first to eighth aspects of the present invention;
It is a power supply module.

The tenth aspect of the present invention provides
An electrical storage element having an electrode body and an exterior body that houses the electrode body, is a holding body that is fixed to an inner wall of the exterior body and holds the electrode body,
It is fixed in the exterior body by fitting with a part of the inner wall of the exterior body,
It is a holding body.

The eleventh aspect of the present invention is
An electricity storage device having an electrode body and a holding body for holding the electrode body, an exterior body for housing the electrode body and the holding body,
Concavities and convexities that fit with the holder are formed on a part of the inner wall,
It is the exterior body of an electrical storage element.

  The present invention as described above has the effect of suppressing the expansion of the electrode body in the exterior body of the power storage element and also enabling the electrode body to be stably held against external vibration and impact. .

1 is an exploded perspective view showing a configuration of a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention. The front view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention. The side view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention. (A) Exploded perspective view showing the configuration of the holder of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention (b) of the holder of the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention Exploded perspective view showing another configuration example The side view which shows the other structural example of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention. The disassembled perspective view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention. The side view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention. The disassembled perspective view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention. The side view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention. The side view which shows the other structural example of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention. The front view which shows the other structural example of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing a configuration of a nonaqueous electrolyte secondary battery 1 according to Embodiment 1 of the present invention in a partially disassembled state, and FIG. 2 is a nonaqueous electrolyte secondary battery 1. FIG. 3 is a side view of the non-aqueous electrolyte secondary battery 1.

  As shown in FIGS. 1 and 2, the non-aqueous electrolyte secondary battery 1 includes a plate-shaped body made of the same material as the container body, which seals the container body 10 made of aluminum and an opening 10 x of the container body 10. And an outer hexahedron-shaped exterior body composed of the lid portion 20. In addition, each side of the exterior body is located in parallel to the X axis, the Y axis, and the Z axis that form the orthogonal coordinates shown in FIG. 1, and in the following description, from the right to the left with reference to the direction of the arrow in the figure, Define from the back to the front (or from the front to the back) and from the bottom to the top. Further, for each part of the nonaqueous electrolyte secondary battery, the surfaces projected on the XY plane are the top and bottom surfaces, the surface projected on the ZX plane is the side surface, and the surface projected on the ZY plane is the front surface or Determined as the back.

  In order to describe the internal configuration of the nonaqueous electrolyte battery 1, only the outline of the container body 10 is indicated by a broken line in FIG. 1 except for an inner bottom 10y described later. For the same reason, the container main body 10 is shown in FIG. 2 as a cross-sectional view of the main part in which the front face in the drawing is cut, and in FIG. 3 as a cross-sectional view of the main part in which the side face is cut.

  The internal space 10z of the container body 10 has a configuration in which a positive electrode and a negative electrode, which are band-like electrodes, are wound in a long cylindrical shape with a separator in between and an axis parallel to the Y axis in the figure as a winding axis. An electrode body 11 is disposed. In FIG. 1, for the sake of explanation, the electrode body 11 is shown as being separated from the lid portion 20 and partially extracted from the container body 10.

  Next, in the electrode body 11, positive and negative metal foils are exposed at both ends of the winding shaft through the separator 11 a located on the outermost periphery, and a pair of short sides of the container body 10 as the metal foil exposed portions. Located on the sides of each. In the drawing, only the configuration in the vicinity of the negative electrode side metal foil exposed portion 11b where the negative electrode side metal foil is exposed will be described with reference numerals, but the positive electrode side also has the same configuration except for the metal material.

  The negative electrode side metal foil exposed portion 11 b is connected to the current collector 12. The current collector 12 includes a base portion 12a fixed to the back surface 20b of the lid portion 20, and a pair of rectangular plate-like leg portions 12b extending from the base portion 12a toward the inner bottom 10y of the container body 10. Each of the opposing surfaces of the leg portion 12b is disposed so as to sandwich the outermost periphery of both ends of the electrode body 11, and the joint surface 12x is fixed by ultrasonic welding or the like.

  The current collector 12 is electrically and mechanically connected by a known technical means such as caulking or crimping via a metal relay plate 22 positioned on the lid 20 and a connecting rod 24 shown by a dotted line in FIG. Connected to. Furthermore, the relay plate 22 is electrically connected to the electrode terminal 23 for external connection, whereby electricity is extracted from the electrode body 11 to the outside of the exterior body.

  The conductive path connecting the electrode terminal 23 and the electrode body 11 is insulated from the exterior body by a synthetic resin packing 21 which is an insulator. The packing 21 also serves to seal the space and gap between the conductive path and the exterior body in order to prevent leakage of the electrolyte from the interior of the exterior body.

  Next, the holding body 13 is provided around the winding axis of the electrode body 11 and further on the outer periphery of the outermost separator 11a. The holding body 13 is a member made of an insulating synthetic resin such as polyethylene or polypropylene, and has an oval annular main body portion 13x corresponding to the side shape of the electrode body 11, as shown in FIG. The entire electrode body 11 is restrained by surrounding the separator 11a without a gap. The main body 13x is divided into two parts by a dividing line 13y, and the configuration thereof will be described later.

  Further, as shown in FIG. 2 and FIG. 3 in particular, a planar upper contact portion 13a1 having a rectangular recess 13a2 formed in the center is provided on the side of the main body portion 13x facing the lid portion 20, and the main body portion 13x. On the side of the portion 13x facing the inner bottom 10y of the container body 10, there is provided a planar lower contact portion 13b1 in which a concave portion 13b2 similar to the concave portion 13a2 is formed. Thus, in a state where the holding body 13 is housed in the exterior body, the upper contact portion 13a1 is in surface contact with the lid portion 20, and the lower contact portion 13 is in surface contact with the inner bottom 10y.

  Further, in the lid portion 20, a convex portion 20b1 having a shape corresponding to the concave portion 13a2 is formed on the back surface 20b facing the inner bottom 10y of the container body 10, and the concave portion 13b2 is formed on the inner bottom 10y of the container body 10. Convex part 10y1 of the shape corresponding to is formed. Thereby, in a state where the holding body 13 is housed in the exterior body, the concave portion 13a2 and the convex portion 20b1, and the concave portion 13b2 and the convex portion 10y1 are respectively fitted and fixed to a specific position in the exterior body.

  In addition, the convex part 20b1 of the cover part 20 is created by stamping and forming an aluminum plate as a base material by press working, and a concave part 20a1 that is an inverted shape of the convex part 20b1 is formed on the surface 20a of the cover part 20. . The convex part 10y1 of the container main body 10 is created in the same manner, and a concave part 10y2 that is an inverted shape of the convex part 10y1 is formed on the bottom surface of the container main body 10.

  Next, FIG. 4A is an exploded perspective view showing the configuration of the holding body 13. The holding body 13 includes a first main body portion 13a having an upper contact portion 13a1 and a first main body portion 13b having a lower contact portion 13b1 with the dividing line 13y shown in FIGS. In addition to the upper contact portion 13a1, the first main body portion 13a includes a constraining portion 13a3 that is a part of the main body portion 13x and has an inverted U-shaped side surface. In addition to the lower contact portion 13b1, the second main body portion 13a includes a restraint portion 13b3 having a U-shaped side surface, which is the remaining part of the main body portion 13x.

  The restraining part 13a3 and the restraining part 13b3 have a pair of opposing plates 13a4 and 13b4 that sandwich the front and back surfaces of the electrode body 13, respectively, and reflect the position of the dividing line 13y of the main body part 13x shown in FIGS. It is formed with an asymmetric length. In each figure, the position of the dividing line 13y is in the vicinity of the opening 10x of the container body 10, and the total length of the counter plate 13b4 is longer than the counter plate 13a4 reflecting this position.

  Further, a dowel 13a5 is provided at the tip of the counter plate 13a4, and a slit 13b5 having a shape corresponding to the shape of the dowel 13a5 is opened at the tip of the counter plate 13b4. By inserting the dowel 13a5 into the slit 13b5, the first main body 13a and the second main body 13b are coupled to complete the holding body 13.

  In the actual production of the non-aqueous electrolyte secondary battery 1, the holding body 13 is assembled by the first main body portion 13 a and the second main body portion 13 b being joined while sandwiching the electrode body 11 from above and below. In this case, the holding body 13 and the electrode body 11 are combined with the lid portion 20 in an integrated state, and then stored in the container body 10.

  On the other hand, the holder 13 may be assembled as follows when the nonaqueous electrolyte secondary battery 1 is produced. That is, when the second main body portion 13b is combined with the container main body 10 in advance, the first main body portion 13a, the electrode body 11 and the lid portion 20 are combined, and when the lid portion 20 and the container main body 10 are combined, The first main body portion 13a and the second main body portion 13b are coupled to complete the exterior body and the holding body 13 simultaneously.

  Particularly in the latter case, it is desirable that the position of the dividing line 13y be in the vicinity of the opening 10x of the container body 10 as described above. The boundary between the first main body portion 13a and the second main body portion 13b and the boundary between the lid portion 20 and the container main body 10 are adjacent to each other, making it easy to see and assembling easily. However, if the holding body 13 can be fixed in a finished state by sandwiching the electrode body 11, the dividing line 13y between the first main body portion 13a and the second main body portion 13b can be arbitrarily set regardless of the specific method for producing the battery. The position may be

  The lid 20 is provided with an inlet for injecting an electrolytic solution after the container body 10 is sealed by laser welding or the like, and is sealed with a sealing plug 25 after the electrolytic solution is injected.

  In the above configuration, the non-aqueous electrolyte secondary battery 1 corresponds to the electricity storage element of the present invention, the container body 10 and the lid portion 20 each correspond to the exterior member of the present invention, and these combinations are integrated as a unit of the present invention. Corresponds to the exterior body. The electrode body 11 corresponds to the electrode body of the present invention, and the holding body 13 corresponds to the holding body of the present invention.

  The nonaqueous electrolyte secondary battery 1 according to the first embodiment having such a configuration includes a holding body 13 that is formed around the electrode body 11 and is fixed at a specific position in the exterior body in a state where the electrode body 11 is restrained. It is characterized by that.

  That is, as explained in the prior art, in the conventional non-aqueous electrolyte secondary battery, the protective member that suppresses the expansion of the electrode body is combined only with the electrode body, so that vibration or impact is applied to the exterior body. At this time, the electrode body swings or vibrates in a state in which the weight of the protective member is further applied, and stress may concentrate on the connection portion between the current collector and the other electrode body and the electrode terminal, which may cause damage. .

  On the other hand, the nonaqueous electrolyte secondary battery 1 according to the first embodiment is configured such that the holding body 13 is fitted and fixed to the inner wall of the lid portion 20 and the container main body 20, whereby the current collector 12 and the holding body 13 are held. The body 13 fixes the electrode body 11 in the exterior body independently of each other.

  Therefore, when vibration or impact is applied to the exterior body, the electrode body 11 is braked by the holding body 13 fixed to the exterior body, and stress is applied to the connection portion between the current collector and other electrode bodies and the electrode terminals. Reduced. Furthermore, the holding body 13 may be of a size necessary for restraining the electrode body 11, and can be accommodated without wastefully occupying the internal space 10z of the exterior body together with the electrolytic solution and other components of the battery. A decrease in electric capacity can be suppressed and the performance of the battery can be maintained.

  Furthermore, in the nonaqueous electrolyte secondary battery 1, the main body 13x of the holding body 13 is formed around the winding axis of the electrode body 11, and the entire outer periphery of the electrode body 11 is surrounded by surrounding the separator 11a on the outermost periphery without any gap. Restrained. As a result, the main body 13x interferes without leakage with any separator and electrode stacking direction, which is the expansion direction of the electrode body 11, and can effectively suppress the expansion of the electrode body 11.

  Further, the first body portion 13a and the second body portion 13b constituting the holding body 13 are independently fitted and fixed to the lid portion 20 and the container body 10, respectively, so that strong vibration and impact are applied to the battery. Even when it is added, the stress applied to the fitting portion is distributed to the individual main body portions, and the load on the holding portion can be reduced.

  Next, in the nonaqueous electrolyte secondary battery 1, it is desirable that the inner dimension of the holding body 13 in contact with the surface of the electrode body 11 is slightly smaller than the outer dimension of the electrode body 11. Specifically, for example, the total length of the opposing plate 13a4 and the opposing plate 13b4 is made slightly smaller than the total height of the electrode body 11, that is, the dimension in the Z-axis direction in the drawing. Similarly, the distance between the upper contact portion 13a1 and the lower contact portion 13b1, which is the vertical dimension of the holding body 13, may be slightly larger than the distance between the back surface 20b of the lid portion 20 and the inner bottom 10y of the container body 10. desirable.

  Thereby, the lid 20 seals the opening 10x of the container body 10, and the electrode body 11 is the lid in a state where the first first body 13a and the second body 13b are combined to complete the holding body 13. The portion 20 and the container body 10 are pressed against each other via the restraining portion 13a3 and the restraining portion 13b3, and the effect of suppressing the expansion of the electrode body 11 can be improved.

  In the above description, “slightly” means a margin of dimensions that does not affect the completed state of the non-aqueous electrolyte secondary battery 1, and is preferably within a range of manufacturing tolerances, for example.

  Further, in the nonaqueous electrolyte secondary battery 1, the fitting dimensions of the concave portion 13a2 of the main body portion 13x, the convex portion 20b1 of the lid portion 20 and the concave portion 13b2, and the convex portion 10y1 of the container main body 10 are as much as possible. It is desirable to be tight, and it is most preferable that the first main body 13a or the second main body 13b is not dropped from the convex side by its own weight after the concave portion and the convex portion are fitted.

  This is based on the following reason. That is, as described above, in order to incorporate the holding body 13 and the electrode body 11 into the exterior body at the time of producing the nonaqueous electrolyte secondary battery 1, each member is combined with the lid portion 20 and the container body 10. In the case where the electrode body 11 is coupled while being sandwiched from above and below by the mounted first main body portion 13a and the second main body portion 13b, and the electrode body 11 and the first main body portion 13a and the second main body portion 13b are coupled in advance. It may be inserted into the main body 10. In particular, in the former case, if the coupling between the container body 10 and the second body portion 13b is unstable, it takes time to incorporate the electrode body 11 into the container body 10, and the production of the nonaqueous electrolyte secondary battery 1 takes place. Sexuality decreases.

  Therefore, by determining the dimensions so that the concave portion side and the convex portion side can be closely fitted, the holding body 13 can be easily completed and incorporated into the exterior body, and the productivity of the nonaqueous electrolyte secondary battery 1 can be improved. Can be increased.

  Thus, according to the nonaqueous electrolyte secondary battery 1 of the first embodiment, the holding body 13 formed around the electrode body 11 and positioned and fixed in the exterior body in a state in which the electrode body 11 is restrained is provided. Thus, the expansion of the electrode body 11 can be suppressed, and the electrode body 11 can be stably fixed to the exterior body against external vibration and impact, thereby improving the reliability of the battery.

  In the above description, the holding body 13 is divided into the first main body portion 13a and the second main body portion 13b and the dowels 13a5, as in the configuration example shown in FIG. The first body portion 13a and the second body portion 13b are coupled to each other by the fitting of the slit 13b5 as in the configuration example shown in FIG. 4B. The tip of the opposing plate 13a4 may be configured by a dowel 13a6 having a latch 13a7, and an opening 13b6 communicating with the slit 13b5 may be provided on the surface of the opposing plate 13b4 of the second main body portion 13b.

  In this case, the latch 13a7 is engaged with the counter plate 13b4 by being partially exposed from the opening 13b6 after being inserted into the slit 13b5. As a result, the first main body portion 13a and the second main body portion 13b are coupled in a state where they cannot be separated unless the latch 13a7 is released.

  In such a configuration example, the holding body 13 can restrain and hold the electrode body 11 by itself before being incorporated into the exterior body. This has the following effects. That is, when the non-aqueous electrolyte secondary battery 1 is produced, if the method of integrating the holding body 13 and the electrode body 11 in advance is taken, the possibility that the holding body 13 is detached from the electrode body 11 is reduced. Therefore, the combination with the lid part 20 and the subsequent work can be easily incorporated into the container body 10, and the battery productivity can be increased.

  Further, the holding body 13 is symmetrical with the upper contact portion 13a1 of the first main body portion 13a and the lower contact portion 13b1 of the second main body portion 13b, and is fitted to each one of the lid portion 20 and the container main body 10. However, the holding body of the present invention may have a configuration in which each dimension of the lower contact portion is made larger as in the holding body 14 shown in FIG. In this case, a plurality of convex portions 10y3a and convex portions 10y3b are provided on the inner bottom 10y of the container body 10y, and the holding body 14 has a plurality of concave portions 13b7a and 13b7b that engage with these convex portions.

  With this configuration, the holding body 14 has a lower center of gravity and a larger contact area with the inner bottom 10y, and can be more stably fixed in the container body 10. In addition, the lower side of the holding body 14 that is constantly impregnated in the electrolytic solution and has an active battery reaction and has a higher risk of expansion than the upper side of the power generation body 11 is reinforced, thereby more effectively expanding the electrode body 11. It becomes possible to suppress.

(Embodiment 2)
FIG. 6 is an exploded perspective view showing a configuration of the nonaqueous electrolyte secondary battery 2 according to Embodiment 2 of the present invention, and FIG. 7 is a side view. However, the same or corresponding components as those in FIGS. 1 to 3 are denoted by the same reference numerals and detailed description thereof is omitted. The same applies to the following embodiments.

  Hereinafter, description will be given with reference to the drawings. The nonaqueous electrolyte secondary battery 2 according to the second embodiment includes a concave portion 15a1 that fits into the convex portion 20b1 of the lid portion 20 and concave portions 15a3a and 15a3b that fit into the convex portions 10y5a and 10y5b of the container body 10y, respectively. The holding part 15 which has the 1st main-body part 15a and the 2nd main-body part 15b mounted in the inner bottom 10y of the container main body 10y and clamped between the electrode body 11 and the inner bottom 10y is provided. As in the first embodiment, concave portions 10y6a and 10y6b, which are inverted shapes of the convex portions 10y5a and 10y5b, are formed on the bottom surface of the container body 10.

  As shown in FIG. 7 in particular, the first main body 15a has a long U-shaped main body 15x covering the main surface of the electrode body 11, that is, the entire surface parallel to the ZY plane in the drawing. The lid 20 is provided from the back surface 20a1 to the inner bottom 10y of the container body 10y, and the upper and lower ends are respectively fitted to the lid 20 and the inner bottom 10y so that the position is specified and fixed. Yes.

  The second main body portion 15b has an overall width substantially the same as the side width (X direction in the drawing) of the electrode body 11, and the surface facing the electrode body 11 is concave corresponding to the shape of the bottom surface of the electrode body 11. Is curved. Further, the second body portion 15b is sandwiched between the electrode body 11 and the inner bottom 10y of the container body 10y in the up-down direction, and is sandwiched between the body portion 15x of the first body portion 15a in the front-rear direction.

  In FIG. 6, the second main body portion 15 b is illustrated as being disposed in a space between the inner bottom 10 y of the container main body 10 y and the electrode body 11 for the sake of explanation.

  In the nonaqueous electrolyte secondary battery 2 of the second embodiment having the above-described configuration, the holding body 15 is constrained by being formed around the coaxial axis of the electrode body 11 as in the first embodiment. The inner bottom 10y of the container main body 10 and the rear surface 20b of the lid 20 which are the inner walls of the exterior body are respectively fitted and fixed at a specific position. As a result, it is possible to suppress the expansion of the electrode body 11 and to stably fix the electrode body 11 in the exterior body against external vibration and impact, thereby improving the reliability of the battery. .

  Furthermore, in the second embodiment, in the holding body 15, the first main body portion 15 a is fixed to the exterior body, and the second main body portion 15 b is in pressure contact with the electrode body 11 via the first main body portion 15 a and the container main body 10. Due to the configuration, the following further effects can be obtained.

  That is, the first main body portion 15a is formed continuously from the inner bottom 10y of the container main body 10 to the back surface 20b of the lid portion 20, so that the two main surfaces of the electrode body 11 are formed as a pair of plates. By sandwiching, it is reinforced in the vertical direction, the durability against expansion in the front and back directions is improved, and the electrode body 11 can be restrained more firmly.

  Next, since the second main body portion 15b is fixed so as to be movable in the vertical direction within a space surrounded by the main body portion 15x of the first main body portion 15a and the inner bottom 10y of the container main body 10, the lid portion 20 When the container body 10 is sealed, it can be pressed against the electrode body 11 to improve the force for restraining the electrode body 11. Further, the second main body portion 15b can be formed using a material different from that of the first main body portion 15a. In this case, it is possible to improve the function as a cushioning material and to fix the electrode body 11 more tightly by making it with a material having elasticity larger than that of the first main body portion 15a. Become.

(Embodiment 3)
FIG. 8 is an exploded perspective view showing the configuration of the nonaqueous electrolyte secondary battery 3 according to Embodiment 2 of the present invention, and FIG. 9 is a side view.

  As shown in each drawing, the non-aqueous electrolyte secondary battery 3 of the third embodiment includes a first main body portion 16a having the same shape and the same configuration as the first holding body 15a of the holding body 15 of the second embodiment. The holding part 16 which has the 2nd main-body part 16b which is an insulating flexible sheet located between the electrode body 11 and the inner bottom 10y is provided.

  Furthermore, the container body 10 is formed on the inner bottom 10y in addition to the convex portions 10y5a and 10y5b having the same shape and the same arrangement as those of the second embodiment, and between the convex portions and directly below the electrode body 11. The base 10z1 is provided.

  The base part 10z1 is a part created by stamping and forming an aluminum plate by press working, similar to the convex parts 10y5a and 10y5b, and is the same as the second holding body 15b of the holding body 15 of the second embodiment. It has the external shape. That is, the surface facing the electrode body 11 has a curved surface that is concavely curved corresponding to the shape of the bottom surface of the electrode body 11, and both ends are parallel to the first main body portion 16a of the first holding body 16a. It has a contact plane. In addition, 10z2 as an inverted shape of the base portion 10z1 is formed on the bottom surface of the exterior body 10.

  Next, as shown in FIG. 9, the second main body portion 16b is positioned between the base portion 10z1 and the electrode body 11, and is sandwiched in a curved state along these shapes. The first main body portion 16a is positioned and fixed by engaging the upper and lower ends with the lid portion 20 and the inner bottom 10y, respectively, with both main surfaces of the electrode body 11 and the base portion 10z sandwiched between the main body portion 16x. ing.

  In the nonaqueous electrolyte secondary battery 3 according to the third embodiment having the above configuration, the first main body portion 16a of the holding body 16 extends from the inner bottom 10y of the container main body 10 to the back surface of the lid portion 20 as in the second embodiment. By being formed continuously up to 20b, the durability against the expansion of the electrode body 11 in the principal surface direction is improved, and the electrode body 11 can be restrained more firmly.

  Further, the base portion 10z1 of the container body 10y is pressed against the electrode body 11 via the second body portion 16b, thereby improving the binding force of the electrode body 11. Furthermore, by adjusting the thickness of the second main body portion 16b, the restraining pressure on the electrode body 11 can be precisely adjusted.

  Furthermore, in this Embodiment 3, since the holding body 16 and the container main body 10 cooperated and it was set as the structure which hold | maintains and fixes the electrode body 11, there exist the following further effects.

  That is, since the base portion 10z1 is formed as a surface shape of the inner bottom 10y of the container main body 10 made of a metal material, the container main body 10 and the electrode body 11 are connected in proximity to each other. The stability is improved.

  Furthermore, since the concave portion 10z2 as an inverted shape of the base portion 10z1 is exposed to the outside of the container body 10, the surface area of the entire outer casing is increased, and the heat dissipation effect of the nonaqueous electrolyte secondary battery 3 is enhanced. .

  In addition, the shape of the surface of the base part 10z1 may be a plane or a surface bent concavely. In this case, it is desirable that the second main body portion 16 b has a three-dimensional shape having a curved surface corresponding to the shape of the bottom surface of the electrode body 11 on the surface facing the electrode body 11. Thereby, the electrode body 11 and the 2nd main-body part 16b contact | adhere closely, and the restraining force of the holding body 16 can be maintained.

  In addition, the structure combined with the container main body 10y having the base part 10z1 according to the third embodiment includes a holding body that directly engages with the base part as in the nonaqueous electrolyte secondary battery 4 shown in FIG. It may be realized as an embodiment.

  As shown in FIG. 10, only the base part 10z3 with the recessed part 10z5 as a reverse shape is formed in the inner bottom 10y of the container main body 10 by the press work similar to the base part 10z1. Similarly to the base portion 10z1, the base portion 10z3 forms a curved surface in which the surface 10z4 facing the electrode body 11 is concavely curved corresponding to the shape of the bottom surface of the electrode body 11. On the other hand, in the base part 10z1, the dimension of the surface facing the electrode body 11 is wider than the shape of the electrode body 11, that is, is enlarged in the X direction in the figure, whereas the dimensions of both ends of the base part 10z3 are The corner 10z3a is exposed to the outside of the electrode body 11.

  On the other hand, in the first main body portion 17a, the holding body 17 has a long U-shaped main body portion 17x corresponding to the entire width of the base portion 10z1 covering the main surface of the electrode body 11, and a notch provided at the tip thereof. 17x1 engages with the corner 10z3a of the base 10z3, thereby fixing the base 10z3 and restraining the electrode body 11. Similar to the holding body 16, a second main body portion 17 b that is an insulating sheet is disposed between the base portion 10 z 3 and the electrode body 11.

  In such a non-aqueous electrolyte secondary battery 4, in addition to the effects of the non-aqueous electrolyte secondary battery 3, the base portion 17 z 3 serves both for holding the electrode body 11 and fixing the first main body portion 17 a. Thus, there is an advantage that the configuration of the container body 10 can be simplified. Furthermore, by reducing the thickness of the container body 10, that is, the dimension in the X direction in the figure, the volume occupied by the electrode body 11 in the exterior body can be expanded, and a battery having a large substantial energy density can be obtained. The shape of the surface 10z4 of the base part 10z3 may be a plane or the like, similar to the shape of the base part 10z1, and in this case, the second main body part 17b is an electrode body on the surface facing the electrode body 11. It is desirable to have a three-dimensional shape having a curved surface corresponding to the shape of the bottom surface of 11.

  As described above, according to the nonaqueous electrolyte secondary battery of the embodiment of the present invention, the holding body that is formed around the electrode body 11 and is engaged and fixed to the exterior body in a state in which the electrode body 11 is restrained. As a result, the expansion of the electrode body 11 can be suppressed, and the electrode body 11 can be stably held against external vibrations and impacts.

  However, the present invention is not limited to the above embodiment.

  In each of the above embodiments, the holding body of the present invention has an annular shape corresponding to the outer shape of the electrode body, as exemplified by the holding body 13, and surrounds the electrode body without a gap. Although this is restrained, the electrode body may be held with a gap around it. As an example, the electrode body 11 is clamped in a state where the first main body portion 13a and the second main body portion 13b are separated from each other with the dividing line 13y shown in FIGS. In particular, in this case, the electrode body 11 can be directly pressed into contact with the lid 20 and the container main body 10, and the effect of suppressing expansion can be improved.

  Furthermore, in each of the above embodiments, the positioning and fixing of the holding body and the exterior body according to the present invention is performed by fitting a convex portion protruding from the inner wall of the exterior body into the concave portion formed on the surface of the holding body. However, the manner of fitting the holding body and the exterior body is not limited to this, and a configuration may be adopted in which a convex portion is formed on the surface of the holding body and a concave portion is provided on the inner wall of the exterior body. . However, when creating a concave or convex portion by pressing as in each of the above embodiments, a convex surface as an inverted shape may occur on the exterior surface of the exterior body, which may interfere with handling and placement, Providing a concave portion on the holding body side and a convex portion on the exterior body side can facilitate the manufacture and use of the battery, and is more preferable.

  Further, in each of the above embodiments, the holding body and the exterior body according to the present invention are coupled by fitting the holding body and the exterior body. Adhesion, screwing, welding, or any other mode may be adopted.

  As shown in the nonaqueous electrolyte secondary battery 5 in FIG. 11, as an example of the coupling mode, the first main body portion 13 a of the holding body 13 is opened to the through hole 20 z opened to the lid portion 20 and the upper contact portion 13 a 1. The screw 26 inserted into the hole 13a8 is fastened to the lid 20 by fastening.

  On the other hand, as another example of the coupling mode, the second main body portion 13 b is fixed to the container main body 11 through a metal fixing member 18 bonded to the inner bottom of the container main body 11. The fixing member 18 has a recess 13b8 formed on the surface facing the second body portion 13b, and the recess 13b8 engages with a claw portion 18a formed at the tip of the lower contact portion 13b1 of the second body portion 13b. By this, it fixes to the 2nd main-body part 13b. The fixing member 18 and the container body 11 may be fixed by welding. The holding body 13 and the container main body 11 or the lid part 20 may be coupled by direct adhesion.

  As described above, the present invention is not limited by the coupling mode as long as the holding body can hold the electrode body in a state of being coupled to a part of the inner wall of the exterior body.

  Furthermore, in each of the above-described embodiments, the holding body of the present invention is positioned and fixed to the container main body 10 and the lid part 20 like the holding body 13, but the container main body 10 or It is good also as a structure fitted only to either one of the cover parts 20. FIG.

  The exterior body of the present invention is realized as a combination of the container body 10 and the lid 20 as two exterior members. However, if the exterior body of the present invention can accommodate the electrode body and the holding body, It is not limited by the specific shape.

  For example, although the shape is an external hexahedron, it may be a prismatic shape whose bottom surface is a triangle or a polygon that is a pentagon or more. Furthermore, a cylindrical shape may be sufficient. Furthermore, the exterior member only needs to be able to complete the exterior body by a combination, and is not limited by the specific shape of each exterior member. Furthermore, the exterior body may be composed of a combination of three or more exterior members.

  Furthermore, although the material of the exterior body is made of aluminum, it may be made of an aluminum alloy, stainless steel, any other metal or metal compound, or resin.

  Furthermore, in the above description, the electrode body of the present invention is a winding type, but it may be a laminated type electrode body. Also in this case, the holding body has the same effects as those of the above embodiments by forming the holding body electrode and the separator so as to interfere with each other without any leakage.

  Furthermore, in the above description, the storage element of the present invention is a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery. However, if the battery can be charged and discharged by an electrochemical reaction, it is nickel. You may use a hydrogen battery and other various secondary batteries. Further, the power storage element of the present invention may be a primary battery. In short, the power storage element of the present invention is not limited by a specific method for generating electromotive force as long as it is an element capable of storing electricity formed by enclosing an electrode body and an electrolyte in an exterior body.

  Further, in the above description, a single nonaqueous electrolyte secondary battery is taken as an example. However, the present invention is a power supply module in which at least one power storage element includes the power storage element of the present invention in a plurality of power storage elements. It may be realized as.

  In short, the present invention may be implemented by adding various modifications to the above-described embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

  The present invention as described above has the effect of suppressing the expansion of the electrode body in the exterior body of the power storage element and capable of stably holding the electrode body against external vibration and impact. For example, it is useful in a power storage device such as a secondary battery.

DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 10 Container main body 10x Opening 10y Inner bottom 10y1 Convex part 10y2 Concave part 10z Inner space 11 Electrode body 11a Separator 11b Negative electrode side metal foil exposure part 12 Current collector 12a Base part 12b Leg part 13 Holding body 13a 1st body part 13a1 Upper contact part 13a2 Concave part 13a3 Restraint part 13a4 Opposing plate 13a5 Dowel 13b Second main body part 13b1 Lower contact part 13b2 Concave part 13b3 Restraint part 13b4 Opposing plate 13b5 Slit 20 Lid part 20a1 Concave part 20b1 Convex part 21 Packing 22 Relay Plate 23 Electrode terminal 24 Connecting rod 25 Sealing plug

Claims (11)

An electrode body;
An exterior body that houses the electrode body;
A holding body for holding the electrode body, which is fixed in the exterior body by being combined with a part of the inner wall of the exterior body,
Power storage element. The exterior body has two exterior members,
The holding body is fixed in the exterior body by fitting with each inner wall of the two exterior members as the part of the inner wall of the exterior body.
The electricity storage device according to claim 1. The holding body restrains the electrode body by being formed so as to surround the electrode body.
The electrical storage element of Claim 1 or 2. The other part of the inner wall of the exterior body is deformed corresponding to the surface shape of the electrode body,
The other part of the holding body and the exterior body is formed so as to surround the electrode body, thereby restraining the electrode body.
The electrical storage element of Claim 1 or 2. The holding body has two holding members, and the two holding members are respectively fitted to the part of the inner wall of the exterior body.
The electrical storage element in any one of Claim 1 to 4. The holding body has two holding members,
One of the two holding members is fitted to the part of the inner wall of the exterior body,
The other of the two holding members is sandwiched between another part of the inner wall of the exterior body and the electrode body,
The electrical storage element in any one of Claim 1 to 5. The part of the inner wall of the exterior body protrudes,
The holding body has a recess corresponding to the part of the inner wall,
The electrical storage element in any one of Claim 1 to 6. The electrode body is pressed from the inner wall of the exterior body through the holding body,
The electrical storage element in any one of Claim 1 to 7. A plurality of power storage elements including at least one power storage element according to any one of claims 1 to 8,
Power supply module. An electrical storage element having an electrode body and an exterior body that houses the electrode body, is a holding body that is fixed to an inner wall of the exterior body and holds the electrode body,
It is fixed in the exterior body by fitting with a part of the inner wall of the exterior body,
Holding body. An electricity storage device having an electrode body and a holding body for holding the electrode body, an exterior body for housing the electrode body and the holding body,
Concavities and convexities that fit with the holder are formed on a part of the inner wall,
An outer package of a power storage element.

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