JP6295695B2 - Storage element and power supply module - Google Patents

Description

  The present invention relates to a storage element such as a secondary battery or other battery and a power supply module using the same.

  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 nonaqueous electrolyte secondary battery is generally provided inside an electrically conductive metal storage container with an electrode body formed by superposing positive and negative electrode plates separated by a microporous membrane separator, and outside the storage container. A current collector that is electrically connected to the electrode terminal and insulated from the storage container, and an electrolytic solution are enclosed (see, for example, Patent Document 1 and FIG. 1). The current collector is fixed inside the storage container and holds the electrode body.

JP 2012-4105 A

  Such conventional non-aqueous electrolyte secondary batteries have the following problems. That is, if the electrode body swings when vibration or impact is applied to the storage container, the current collector may be vibrated or subjected to a large stress, which may cause problems with the electrode body or the current collector. Furthermore, the current collector may be deformed due to the stress applied when the current collector is fixed inside the storage container.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power storage element capable of stably fixing a current collector in a storage container and a power supply module using the same. .

In order to achieve the above object, the first aspect of the present invention provides:
An electrode body;
A current collector connected to the electrode body;
Storing the electrode body and the current collector, and a storage container to which the current collector is fixed,
The current collector is further locked inside the storage container,
It is a power storage element.

The second aspect of the present invention is
An insulating member fixed to the inner wall of the storage container and having a locking portion for locking the current collector;
It is an electrical storage element of the 1st side surface of this invention.

The third aspect of the present invention is
The current collector is
A base portion fixed to the inner wall via the insulating member and locked by the locking portion;
A leg portion connected to the electrode body,
The locking portion is located closer to the leg portion than the fixing position with the storage container on the base portion.
It is an electrical storage element of the 2nd side surface of this invention.

The fourth aspect of the present invention is
The current collector has a plurality of legs;
The locking portion is located between the plurality of legs.
It is an electrical storage element of the 3rd side surface of this invention.

The fifth aspect of the present invention provides
The locking part is adjacent to the leg part,
It is an electrical storage element of the 3rd or 4th side surface of this invention.

The sixth aspect of the present invention provides
The height of the locking portion decreases from the periphery of the base portion toward the center,
It is an electrical storage element of the 2nd to 5th side surface of this invention.

The seventh aspect of the present invention is
The locking portion has a shape following the outer shape of the electrode body,
It is an electrical storage element of the 2nd to 6th side surface of this invention.

The eighth aspect of the present invention provides
An electrode body;
A current collector connected to the electrode body;
Storing the electrode body and the current collector, and a storage container to which the current collector is fixed,
The current collector is locked to the base portion from the direction in which the insulating member and the base portion face each other on the inner wall side of the storage container.
It is a power storage element.

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

  The present invention as described above has an effect that the current collector can be stably fixed in the storage container.

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. 1 is an exploded perspective view showing a configuration of a main part of a nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention. (A) Sectional drawing which shows the structure of the principal part of the nonaqueous electrolyte secondary battery of Embodiment 1 of this invention (b) The structure of the principal part of the nonaqueous electrolyte secondary battery of Embodiment 1 of this invention is shown. Plan view (A) The figure for demonstrating the state of the electrical power collector in the conventional nonaqueous electrolyte secondary battery (b) The figure for demonstrating the state of the electrical power collector in the conventional nonaqueous electrolyte secondary battery (A) The figure for demonstrating the coupling | bonding of the internal packing and electrical power collector in the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention (b) The nonaqueous electrolyte secondary which concerns on Embodiment 1 of this invention FIG. 6C is a diagram for explaining the coupling between the inner packing and the current collector in the secondary battery. In order to explain the coupling between the inner packing and the current collector in the nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention. Figure of (A) The figure which shows the structure of the internal packing of the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention (b) The structure of the internal packing of the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention Plan view The figure which shows the other structural example of the internal packing and electrical power collector in the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention. (A) The figure which shows the other structural example of the internal packing of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) Other than the internal packing of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention Of configuration example The disassembled perspective view which shows the other structural example of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention.

  Embodiment 1 of the present invention will be described below 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. FIG. 3 is a side view of the nonaqueous electrolyte secondary battery 1.

  As shown in FIGS. 1 and 2, the nonaqueous electrolyte secondary battery 1 includes a plate body made of the same material as the container body, which seals the container body 10 made of an aluminum open box and the opening 10 x of the container body 10. A storage container having a hexahedron-shaped outer shape is formed as an exterior.

  Each side of the storage container is positioned in parallel to the X axis, the Y axis, and the Z axis that form orthogonal coordinates shown in FIG. Next, in order to describe the internal configuration of the nonaqueous electrolyte secondary battery 1, only the outline of the container body 10 is indicated by a broken line in FIG. For the same reason, the container body 10 and the lid 20 are shown in FIG. 2 as a cross-sectional view taken along a plane parallel to the ZY plane in the drawing, and in FIG. It was shown as a cross-sectional view of the main part cut by a plane parallel to the X plane.

  In the internal space 10z of the container body 10, a positive electrode and a negative electrode, which are band-shaped electrode plates each having an active material layer formed at the center, are wound around an axis parallel to the Y axis in the figure with a separator interposed therebetween. The electrode body 11 having a configuration wound in a long cylindrical shape is disposed. The negative electrode is configured, for example, by forming a mixture layer containing a negative electrode active material on the surface of a strip-shaped copper foil. The positive electrode is configured, for example, by forming a mixture layer containing a positive electrode active material on the surface of a strip-shaped aluminum foil.

  The electrode body 11 is exposed in a state where the metal foil of the positive electrode and the metal foil of the negative electrode overlap each other with the separator 11a located on the outermost periphery in between, and are positioned at both ends as the metal foil exposed portions 11b. .

  In FIG. 1, only the configuration on the side where the negative metal foil is exposed as the metal foil exposed portion 11b is described with reference numerals, but the positive metal foil exposed portion is the same except for the metal material. It has a configuration. Further, 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.

  The metal foil exposed portion 11 b is connected to the current collector 12. The current collector 12 is fixed to the back surface 20y of the lid portion 20 and is bent from a flat base portion 12a having an outer rectangular shape and a side surface of the base portion 12a on the long side along the Y-axis direction in the figure. And a pair of flat leg portions 12b extending toward the inner bottom 10y of the container body 10 along the Z-axis direction in the figure. Each of the opposing surfaces of the pair of leg portions 12b is disposed so as to sandwich the surface of the exposed metal foil portion 11b of the electrode body 11, and is joined to the electrode body 11 by ultrasonic welding or the like.

  On the other hand, an electrode terminal 23 for external connection is provided on the surface 20x side of the lid 20. The electrode terminal 23 is a metal member having a cylindrical bolt portion 23a having a threaded surface and a base portion 23b formed at one end of the bolt portion 23a and embedded in an outer packing 21a described later.

  Further, on the surface 20 x side of the lid portion 20, a connecting rod 22 is provided so as to cover the pedestal portion 23 b of the electrode terminal 23. The connecting can 22 has a rectangular relay plate 22a with a through hole into which a bolt part 23a is inserted on the surface, and an inner bottom 10y of the container body 10 along the Z-axis direction from the surface of the relay plate 22a. This is a metal member having a cylindrical connecting rod 22b extending toward the surface. The base 23b is sandwiched between the relay plate 22a and the outer packing 21a via the bolt part 23a, so that the electrode terminal 23 is combined with the connecting rod 22.

  The connecting rod 22b of the connecting can 22 is electrically and mechanically connected to the current collector 12 by being coupled to the base portion 12a of the current collector 12 by known technical means such as caulking or crimping. . In the first embodiment, as an example, it is fixed by caulking, and the tip of the connecting rod 22b forms a caulking end 22x and is in pressure contact with the base portion 12a. Furthermore, since the relay plate 22a of the connecting can 22 is combined with the electrode terminal 23 as described above, electricity is extracted from the electrode body 11 to the outside of the storage container.

  In the connection rod 22, the relay plate 22a and the connecting rod 22b are shown in an integrated form in the drawing, but are created as an integrally molded part on the positive electrode side, and each is independent on the negative electrode side. In some cases, the relay plate 22a and the connecting rod 22b as a member are combined as a part by press fitting or the like.

  The conductive path connecting the electrode terminal 23 and the electrode body 11 is insulated from the storage container by an outer packing 21a and an inner packing 21b made of a synthetic resin material, which are insulators. In FIG. 2, the outer packing 21a and the inner packing 21b are shown as sectional views. The outer packing 21 a is disposed on the surface 20 x of the lid portion 20 and insulates the lid portion 20 from the electrode terminal 23 and the connecting rod 22. The inner packing 21 b is disposed on the back surface 20 y of the lid portion 20 and insulates the lid portion 20 and the current collector 12. The outer packing 21a and the inner packing 21b are fastened together by the current collector 12 and the connecting rod 22 in an integrally assembled state, thereby closing the space and gap between the conductive path and the storage container. The electrolyte solution is prevented from leaking from the inside of the storage container.

  The lid portion 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 by a sealing plug 24 after the electrolytic solution is injected.

  Next, referring further to the exploded perspective view of FIG. 4 and the enlarged view of the main part of FIG. 5, the current collector 12, the outer packing 21 a and the inner packing 21 b, the connection rod 22, and the electrode terminal in the nonaqueous electrolyte secondary battery 1. The configuration near 23 will be described.

  As shown in FIG. 4, the base 12 a of the current collector 12, the outer packing 21 a and the inner packing 21 b, and the relay plate 22 a of the connection rod 22 are in the long side direction of the lid portion 20, in the Y-axis direction in the figure. The base portion 12a and the relay plate 22a are stacked in the Z-axis direction in the figure, with the outer packing 21a, the lid portion 20 and the inner packing 21b sandwiched therebetween. Yes.

  The outer packing 21 a includes a body portion 21 a 1 sandwiched between the lid portion 20 and the relay plate 22 a of the connection rod 22, and a cylindrical portion 21 a 2 that is integrally formed with the body portion 21 a 1 and provided on the surface facing the lid portion 20. A through hole 21a3 communicating with the main body 21a1 is opened at the center of the cylinder portion 21a2, and the connecting rod 22b of the connection rod 22 is inserted into the through hole 21a3 in a stacked state.

  The surface of the main body 21a1 facing the relay plate 22a, which is a blind spot in the figure, is formed with a wall-shaped portion surrounding the periphery of the relay plate 22a and a planar rectangular recess in which the pedestal 23b of the electrode terminal 23 is embedded. ing. Since the pedestal portion 23b is embedded in the recess of the main body portion 21a1, the rotation of the bolt portion 23a on the XY plane in the drawing is restricted.

  The lid portion 20 is provided with an opening 20z through which the cylindrical portion 21a2 of the outer packing 21a passes.

  The inner packing 21b is provided on the main body part 21b1 sandwiched between the lid part 20 and the base part 12a of the current collector 12, the wall part 21b2 formed corresponding to the contour of the main body part 21b1, and the wall part 21b2. And a locking portion 21b3.

  The locking portion 21b3 is a claw-shaped member that is orthogonal to the extending direction of the wall portion 21b2 and extends to the center side of the main body portion 21b1 along the X-axis direction in the figure. The locking portions 21b3 are a pair of walls. It arrange | positions so that it may face each of a pair of long side of the part 21b2. As shown in FIG. 3, the outer surface 21b3a facing the inner space 10z side of the storage container has a smaller dimension in the Z-axis direction in the drawing from the wall 21b2 side to the tip 21b3c. On the other hand, the inner surface 21b3b facing the main body 21b1 forms a parallel surface with respect to the main body 21b1. Accordingly, when viewed from the XZ plane in the figure, the locking portion 21b3 has a wedge shape whose height decreases from the periphery of the base portion 12a toward the center.

  Further, as shown in FIG. 3 and FIGS. 5A and 5B, in the stacked state, the locking portion 21b3 is adjacent to the leg portion 12b of the current collector 12 and is positioned so as to overlap the surface of the base portion 12a. doing. Thereby, the latching | locking part 21b3 hold | maintains the base part 12a from a periphery in cooperation with the main-body part 21b1, and the surface of the base part 12a is exposed as a space between a pair of latching parts 21b3.

  Further, a through hole 21b4 having substantially the same dimensions as that of the opening 20z of the lid portion 20 is opened in the main body portion 21b1, and the cylindrical portion 21a2 of the outer packing 21a is connected to the connection can 22 in the stacked state in the stacked state. Inserted with the rod 22b.

  The dimension of the through hole 12a1 opened in the base part 12a of the current collector 12 is substantially the same as that of the connecting rod 22b of the connecting rod 22, and the length of the cylindrical part 21a2 of the outer packing 21a is the same as that of the lid part 20 and the inner part. This is substantially the same as the total thickness of the main body 21b1 of the packing 21b. Thereby, in the laminated state, the tip of the cylinder portion 21a2 contacts the surface of the base portion 12a, and the tip 22b1 of the connecting rod 22b protrudes from the base portion 12a. By caulking the tip 22b1, a caulking end 22x having an outer diameter larger than the through-hole 12a1 is formed. The space between the front surface 20x and the back surface 20y of the lid 20 is closed.

  In the above configuration, the nonaqueous electrolyte secondary battery 1 corresponds to a power storage element of the present invention, and the combination of the container body 10 and the lid portion 20 corresponds to a storage container of the present invention. The back surface 20y of the lid 20 corresponds to the inner wall of the storage container of the present invention. The electrode body 11 corresponds to the electrode body of the present invention. The current collector 12 corresponds to the current collector of the present invention, the base portion 12a and the leg portion 12b correspond to the base portion and the leg portion of the present invention, respectively, and the inner packing 21b corresponds to the insulating member of the present invention. To do.

  The nonaqueous electrolyte secondary battery 1 according to the first embodiment having such a configuration is provided between the base portion 12a and the lid portion 20 of the current collector 12, and has a locking portion 21b3. An inner packing 21b for holding the base portion 12a from the periphery is provided.

  In the conventional flat non-aqueous electrolyte secondary battery in which the inner packing 21b does not have the locking portion 21b3, as shown in FIG. This is performed by caulking of the connecting rod 22b of the connecting rod 22, and the fixing position of the current collector 12 and the lid portion 20 coincides with the caulking end 22x.

  In this case, the present inventor found the following matters. That is, when an impact or vibration is applied from the outside of the storage container, a load from the electrode body 11 is applied to the current collector 12. In particular, on the main surface of the base portion 12a, the caulking end 22x faces the leg portion 12b to which the electrode body 11 is connected with the center of gravity of the main surface interposed therebetween, so the load is in the Z direction in the figure. As a stress in the case, it appears greatly near the leg 12b.

  Further, even when the nonaqueous electrolyte secondary battery 1 is manufactured, the caulking pressure of the connection rod 22 is the same as that of the base portion 12a when the current collector 12 is coupled from the connection rod 22 shown in FIG. May be excessively stressed.

  As a result, as shown in a region R indicated by a dotted line in FIG. 6B, the base portion 12a of the current collector 12 is bent or warps in the Z direction with the caulking end 22x as a fulcrum. Such deformation of the base portion 12a causes a change in the posture of the leg portion 12b, and in the electrode body 11, there is a risk that the vicinity of the joint portion between the exposed portion of the metal foil and the leg portion 12b may be peeled off or torn. was there. Further, the vibration of the current collector 12 due to the impact or vibration on the battery is transmitted to the electrode body 11, and there is a possibility that the exposed portion of the metal foil has the same influence as described above.

  Furthermore, the deformation of the base portion 12a itself may affect the closed state of the storage container due to the pressure bonding of the outer packing 21a and the inner packing 21b.

  The present invention has been made based on such studies. In the first embodiment, the inner packing 21b holds the base portion 12a of the current collector 12 from the periphery by the main body portion 21b1 and the locking portion 21b3. By doing so, the base portion 12a is held from the locking portion 21b3 in addition to being fixed at the caulking end 22x.

  As shown in FIGS. 5 (a) and 5 (b), the locking portion 21b3 reaches the surface of the base portion 12a and interferes therewith, and functions as a buffer against stress in the Z direction in the figure. The vibration and deformation of 12a are suppressed. Thereby, it becomes possible to fix the current collector 12 to the lid portion 20 as a storage container in a stable state.

  Further, in the first embodiment, as shown in FIGS. 3 and 5 (b), the center line parallel to the Y axis in which the locking portion 21b3 passes through the connecting rod 22 (the chain line in FIG. 5 (b)). It is characterized by being arranged symmetrically. Thereby, the influence on the crimping end 22x to which a load is applied is isotropically dispersed, and the effect of suppressing deformation is enhanced.

  Further, the first embodiment is characterized in that a locking portion 21b3 is provided adjacent to the leg portion 12b, as shown in FIGS. 5 (a) and 5 (b). As a result, the locking portion 21b3 directly interferes with the leg portion 12b, thereby restricting the rotation of the leg portion 12b in the ZY plane in the drawing as shown in FIG. The effect of suppressing vibration and deformation can be further enhanced.

  It is more preferable that the locking portion 21b3 and the leg portion 12b are in close contact with each other, and even when there is an interval between the locking portion 21b3 and the leg portion 12b, the interval may be within a tolerance range. desirable. In each figure, tolerances are exaggerated for explanation.

  Furthermore, in a state in which the locking portion 21b3 locks the base portion 12a of the current collector 12, the inner surface 21b3b may be in close contact with or in pressure contact with the surface of the base portion 12a. Even when the inner surface 21b3b is separated, if a minute deformation occurs in the base part 12a, the locking part 21b3 interferes with the base part 12a, and further deformation is suppressed. Thus, the effects of the present invention are exhibited.

  Further, the locking portion 21b3 is not adjacent to the leg portion 12b, but may be provided away from the caulking end 22x and closer to the leg portion 12b, and has a certain effect. In this case, it is more preferable that the locking portion 21b3 and the caulking end 22x are arranged with the center of gravity on the plane of the base portion 12a interposed therebetween.

  Furthermore, in the first embodiment, the locking portion 21b3 protrudes from the wall portion 21b2 provided at the peripheral edge of the base portion 12a, and the tip 21b3c is positioned on the surface of the base portion 12a. As shown in FIG. 4, the outer shape is a wedge shape. This has the following effects. That is, as shown in FIG. 4, the configuration of the relay plate 22a, the electrode terminal 23, the outer packing 21a, the lid portion 20, the inner packing 21b and the base portion 12a of the current collector 12 of the connecting can 22 is shown in the drawing. The layers are stacked and combined along the Z-axis direction, and the connection rod 22b is crimped by crimping to complete the process.

  In the above process, as shown in FIG. 7A, when the inner packing 21b and the current collector 12 are overlapped and pushed in the direction of the Z-axis arrow in the figure, as shown in FIG. 7B, The locking portion 21b3 is elastically deformed toward the lid portion 20 until the periphery of the base portion 12a comes into contact with the outer surface 21b3a, which is a slope, and the distal end 21b3c and the periphery of the base portion 12a coincide. Then, as shown in FIG. 7 (c), when the base part 12a is fitted to the main body part 21b1, the tip 21b3c of the locking part 21b3 is released from contact with the peripheral edge of the base part 12a, and is restored to its original shape. By restoring, the base 12a is locked.

  As described above, the inner packing 21b and the current collector 12 are fixed by the locking portion 21b3 in parallel with and in the same direction as the step of joining the base portion 12a of the electrode terminal 23 to the current collector 12. Done. Thereby, complication of the manufacturing process of the nonaqueous electrolyte secondary battery 1 due to the addition of the locking portion 21b3 is suppressed, and a reduction in battery productivity is prevented.

  Furthermore, in the present embodiment, the engaging portion 21b3 protrudes from the wall portion 21b2 located at the peripheral edge of the base portion 12a, and the tip 21b3c is located on the surface of the base portion 12a. The gap between the body 11 and the base part 12a is maintained as in the conventional case.

  As a result, it is possible to prevent the size of the electrode body 11 from being reduced or the storage container from being enlarged due to the addition of the locking portion 21b3, and to prevent the battery capacity of the nonaqueous electrolyte secondary battery 1 from being substantially reduced.

  Further, in the present embodiment, as shown in FIG. 3, a pair of wedge-shaped locking portions 21b3 are arranged on the wall portion 21b2 positioned at the periphery of the base portion 12a, and are formed at the center of the base portion 12a. By adopting a configuration in which the space is interposed, the shape formed on the surface of the base portion 12a and the surface of the locking portion 21b3 is a trapezoidal dent following the curved shape of the upper portion of the electrode body 11. It has become.

  Thereby, the volume of the electrode body 11 accommodated in the container main body 10 can be increased, for example, to such an extent that the surface of the electrode body 11 is in contact with the locking portion 21b3. It is possible to suppress a substantial decrease in battery capacity of the secondary battery 1.

  In the above description, the locking portion 21b3 has a wedge shape whose height decreases from the periphery of the base portion 12a toward the center, but follows the surface shape of the electrode body 11. Any shape such as an arc may be used.

  Furthermore, since the locking portion 21b3 can be formed by integral molding as a minute external shape change with respect to the shapes of the main body portion 21b1 and the wall portion 21b2 of the inner packing 21b, it can be realized at low cost.

  As described above, according to the nonaqueous electrolyte secondary battery 1 according to the first embodiment of the present invention, the nonaqueous electrolyte secondary battery 1 is provided between the base portion 12a and the lid portion 20 of the current collector 12, and is provided by the locking portion 21b3. By providing the inner packing 21b that holds the base portion 12a from the periphery, the current collector 12 can be stably fixed in the storage container.

(Embodiment 2)
The nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention has the same configuration as that of Embodiment 1 except for the inner packing as an insulating member. Accordingly, FIGS. 1 to 3 are appropriately referred to in the description, and the same or corresponding components are denoted by the same reference numerals and detailed description thereof is omitted.

  FIG. 8A is a perspective view showing the configuration of the inner packing 21c in the nonaqueous electrolyte secondary battery of the present embodiment. As shown in FIG. 8 (a), the inner packing 21c in the second embodiment has a main body portion 21b1, a wall portion 21b2, and a through hole 21b4 similar to the inner packing 21b in the first embodiment, and further includes a wall portion. 21b2 is provided with a locking portion 21c1 on the short side along the X-axis direction in the drawing.

  FIG. 8B shows a configuration in which such an inner packing 21c is replaced with the inner packing 21b and incorporated in a nonaqueous electrolyte secondary battery. As shown in FIG. 8B, as in the first embodiment, the locking portion 21c1 reaches the surface of the base portion 12a and interferes therewith, and is in the Z-axis direction (perpendicular to the XY plane in the drawing). It functions as a buffer against stress in the case, and suppresses vibration and deformation of the base part 12a. Thereby, it becomes possible to fix the current collector 12 to the lid portion 20 as a storage container in a stable state.

  Furthermore, in the second embodiment, the locking portion 21c1 passes through the connecting rod 22 and is on a center line parallel to the Y axis in the figure (a chain line in FIG. 8B), and is a pair of the current collectors 12. It arrange | positions in the middle of the leg part 12b. Accordingly, the locking portion 21c1 is disposed at a position farthest from the caulking end 22x, which is a fulcrum of deformation, in the vicinity of the leg portion 12b, thereby further enhancing the effect of suppressing deformation of the base portion 12a. Yes.

  Further, in the second embodiment, the locking portion 21c1 is arranged on a single side of the wall portion 21b2, thereby fixing the inner packing 21b and the current collector 12 by the locking portion 21c1. This can be performed more smoothly than in the case of the first embodiment, and the productivity of the battery can be improved.

  Furthermore, even when the work of attaching the inner packing 21b and the current collector 12 is performed independently of the process of joining the base parts 12a of the electrode terminals 23 to the current collector 12, the work is performed on the base part. This can be performed by a simple procedure of inserting the short side of 12a into the locking portion 21c1, and the workability is improved.

  As described above, according to the nonaqueous electrolyte secondary battery of each embodiment of the present invention, the inner packing as an insulating member that insulates between the storage container and the current collector is provided by the engaging portion. By adopting the holding configuration, the current collector can be stably fixed in the storage container.

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

  In each of the above-described embodiments, the current collector 12 has a pair of flat leg portions 12b extending from the side surface on the long side of the flat rectangular base portion 12a. The current collector of the present invention may be fixed in the storage container and connected to the electrode body, and is not limited by its specific configuration.

  As an example, in the configuration example shown in FIG. 9, the pair of leg portions 12b of the current collector 12 is provided on the side surface on the short side along the X-axis direction in the drawing of the flat base portion 12a. At the boundary between each leg portion 12b and the base portion 12a, a flat plate-like base portion 12c extending from the base portion 12a and bent downward along the Z axis in the figure is located. The pair of leg portions 12b are formed by twisting a pair of both ends extending from both ends of the base portion 12c at right angles in the opposite direction to each other, and sandwiching the electrode body 11 as in the current collector 12 of the first embodiment. To do.

  Corresponding to such a current collector 12, an inner packing 21d as an insulating member of the present invention has a main body portion 21d1 and a through hole 21d5 having the same dimensions as the main body portion 21b1 and the through hole 21b4 of the inner packing 21b, respectively. On the other hand, the wall portion 21d2 corresponds to the shape of the base portion 12c of the wall portion 21d2 and the current collector 12 located on the three sides of the short side and the pair of long sides adjacent to the through hole 21d5 of the main body portion 21d1. It has wall part 21d3 shape | molded rather than tall. A locking portion 21d4 is provided on the wall portion 21d3 so as to be positioned between the pair of leg portions 12b of the current collector 12.

  Even in such a configuration, when incorporated in a non-aqueous electrolyte secondary battery, the locking portion 21d4 is locked to the edge of the root portion 12c to suppress vibration and deformation of the base portion 12a. In addition, the same effects as those of the second embodiment can be obtained.

  In the above description, the locking portion 21d4 is disposed between the pair of leg portions 12b of the current collector 12 as in the second embodiment. However, as in the first embodiment, the locking portion 21d4 is good also as a structure located in the periphery of the long side of the base part 12a.

  Furthermore, in Embodiment 1, the locking portions 21b3 are arranged so as to face each of the pair of long sides of the wall portion 21b2 in pairs, but the locking portion of the present invention is It may be arranged at an arbitrary position on the wall 21b2 as long as the stress generated in the current collector fixed to the storage container can be buffered.

  As an example, the inner packing 21e shown in FIG. 10A is disposed on the pair of long sides of the wall 21b2 so that the pair of locking portions 21e1a and 21e1b are shifted from each other in the central axis. As a result, as in the second embodiment, the attachment of the inner packing 21b and the current collector 12 by each locking portion is performed within the process of joining the electrode terminal 23 to the base portion 12a of the current collector 12. Therefore, the attachment can be performed more smoothly, and the productivity of the battery can be improved.

  Furthermore, it is good also as a structure which provides three or more latching | locking parts. Furthermore, as shown in FIG. 5B, the planar shape of the locking portion 21b3 is rectangular, but the locking portion of the present invention has a tip portion locked to the surface of the base portion of the current collector. If it is, it will not be limited by the specific shape, Triangular shape, semicircle shape, and other arbitrary shapes can be taken.

  Further, in each of the above embodiments, the locking portion has a wedge shape whose height decreases from the peripheral edge of the base portion 12a toward the center like the locking portion 21b3 shown in FIGS. However, it may have a shape such as a rectangular shape whose height does not change. In this case, the mounting of the base portion 12a of the current collector 12 is performed for each locking portion independently of the process of connecting the electrode terminal 23 to the base portion 12a of the current collector 12.

  Further, in each of the above embodiments, the locking portion is provided on the wall portion 21b2 or the like provided on the periphery of the main body portion of the inner packing, but the insulating member of the present invention is shown in FIG. It is good also as what has the latching | locking part 21f2 formed directly from the main-body part 21f1 which abbreviate | omits a wall part and insulates the base part 12a of the collector 12 like the inner packing 21f shown. Even in this case, the stress generated in the current collector 12 in the Z-axis direction in the figure can be buffered. However, providing the main body portions 21b1, 21f1, etc. with the wall portions, such as the wall portions 21b2, produces the current collector around the connecting rod 22b of the connecting rod inserted into the through hole 21f3, which occurs on the XY plane in the figure. There is an effect of suppressing rotation and translation of 12 and is more preferable.

  Furthermore, in the above description, both the positive electrode and the negative electrode of the nonaqueous electrolyte secondary battery are configured to include the insulating member of the present invention, but a plurality of current collectors are fixed in the storage container in the power storage element. In such a case, it is sufficient that at least one current collector is fixed via the insulating member of the present invention.

  Furthermore, in the above description, the inner packing 21b to the inner packing 21f and the base portion 12a of the current collector 12 are all rectangular in plan shape, but the insulating member and current collector of the present invention are in the shape thereof. However, it can take any shape depending on the mode of the power storage element.

  Further, in the above configuration, the conductive path connecting the electrode terminal 23 and the electrode body 11 is accommodated by a combination of the outer packing 21a having the cylindrical portion 21a2 and the inner packing 21b having the through hole 21b4 into which the cylindrical portion 21a2 is inserted. The insulating member of the present invention is only required to insulate the current collector and the storage container at least inside the storage container, and is limited by its specific shape and configuration. Is not to be done.

  Furthermore, the electricity storage device of the present invention is a nonaqueous electrolyte secondary battery in which the positive electrode side outer packing 21 a and the inner packing 21 b are omitted, and the positive electrode side current collector 12 is also electrically connected to the lid portion 20. It may be realized in a configuration in which the storage container is kept at the potential of the positive electrode. That is, in each of the above embodiments, the current collector 12 is indirectly locked from the back surface 20y of the lid portion 20 as the inside of the storage container through the inner packing 21b. By providing the back surface 20y of the portion 20 with a locking portion having the same shape and arrangement as described above by a known technique such as pressing, the back surface 20y of the lid portion 20 which is the inside of the storage container is directly connected to the current collector. 12 may be locked. Even if it is this structure, the effect similar to said each embodiment is acquired.

  Furthermore, in the above description, the present invention is assumed to have a storage container composed of a container body 10 for storing the electrode body 11 and a lid portion 20 to which the current collector 12 is fixed. For example, the current collector 12 may be fixed on the container body 10 without being limited to a specific configuration of the storage container.

  Further, in the above description, the present invention is an embodiment in which the electrode body 11 is fixed to the lid portion 20 side via the current collector 12, but may be an embodiment in which the electrode body 11 is also fixed from the container body 10 side. . The nonaqueous electrolyte secondary battery 2 shown in FIG. 11 is provided with an insulating film 30 that covers the lower side of the electrode body 11 and insulates the inner wall of the container body 10 and the electrode body 11, and is provided between the inner bottom 10 y and the insulating film 30. A buffer sheet 32 made of a material having corrosion resistance and elasticity to an electrolytic solution, such as silicon rubber, is provided. In addition, in the figure, the insulating film 30 has shown the outline with the dashed-dotted line for description, and was shown as virtually transparent.

  The electrode body 11 and the insulating film 30 are bonded by a double-sided tape 31, and the insulating film 30 and the buffer sheet 32, and the buffer sheet 32 and the inner bottom 10y are bonded by double-sided tapes 33a and 33b, respectively.

  With such a configuration, the electrode body 11 is fixed from both the back surface of the lid portion 20 that is the opposing surface of the storage container and the inner bottom 10y of the container body 10, and when an impact is applied from the outside of the storage container. In addition to preventing the electrode body 11 from swinging, the buffer sheet 32 can reduce the impact, thereby reducing the risk of deformation of the electrode body 11 and the current collector 12. The double-sided tapes 31, 33a and 33b may each be an adhesive layer. Furthermore, it is good also as a structure provided with the inner side packing which does not have a latching | locking part instead of the inner side packing 21b as an insulating member of this invention.

  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. Moreover, a primary battery may be sufficient. Furthermore, an electric double layer capacitor and other various capacitors may be used. 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 accumulating electricity formed by sealing an electrode body and an electrolyte in a storage container. .

  Furthermore, in the above description, the container body 10 is made of aluminum, but it may be made of an aluminum alloy, stainless steel or any other metal or metal compound, resin, or aluminum laminate. Similarly, the electrode terminal 23 composed of the bolt part 23a and the pedestal part 23b is provided. However, the electrode terminal 23 is omitted, and the relay plate 22a of the connection rod 22 is used as a terminal, and wiring and bus bars are directly welded. It is good also as a structure to connect.

  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 an effect of allowing the current collector to be stably fixed in the storage container, and is useful in a power storage element such as a secondary battery.

DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 10 Container main body 10x Opening 10y Inner bottom 10z Internal space 11 Electrode body 11a Separator 11b Exposed metal foil part 12 Current collector 12a Base part 12b Leg part 12a1 Through-hole 20 Lid part 20x Surface 20y Back surface 20z Opening 21a Outer packing 21b Inner packing 21a1 Main body portion 21a2 Tube portion 21a3 Through hole 21b1 Main body portion 21b2 Wall portion 21b3 Locking portion 21b4 Through hole 22 Connection rod 22a Relay plate 22b Connection rod 22b1 Tip 22b Clamping end 23 Electrode 23 Base 24 Sealing plug

Claims (8)

An electrode body;
A current collector connected to the electrode body;
A storage container that stores the electrode body and the current collector, and to which the current collector is fixed ;
An insulating member fixed to the inner wall of the storage container and having a locking portion for locking the current collector ;
The current collector is
A flat base portion fixed to the inner wall via the insulating member and locked by the locking portion;
A leg portion bent from the base portion and connected to the electrode body;
The locking portion locks the periphery of the base portion parallel to the boundary between the leg portion and the base portion.
Power storage element. An electrode body;
A current collector connected to the electrode body;
A storage container that stores the electrode body and the current collector, and to which the current collector is fixed ;
An insulating member fixed to the inner wall of the storage container and having a locking portion for locking the current collector ;
The current collector is
A base portion fixed to the inner wall via the insulating member and locked by the locking portion;
A plurality of legs connected to the electrode body;
The locking portion is located between the plurality of legs.
Power storage element. The current collector has a plurality of said legs,
The locking portion is located between the plurality of legs.
The electricity storage device according to claim 1 . Before Kigakaritome portion at the base portion on, located on the leg closer than the fixed position of the container,
The electrical storage element in any one of Claim 1 to 3 . The locking part is adjacent to the leg part,
The electrical storage element in any one of Claim 1 to 4 . The height of the locking portion decreases from the periphery of the base portion toward the center,
The electrical storage element in any one of Claim 1 to 5 . The locking portion has a shape following the outer shape of the electrode body,
The electrical storage element in any one of Claim 1 to 6 . Power module with at least one electric storage device according to any one of claims 1 to 7.

Images