JP5919853B2 - Electricity storage element - Google Patents

Description

  The present invention relates to a power storage element such as a secondary battery or other batteries and a storage container member used therefor.

  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, since non-aqueous electrolyte secondary batteries represented by lithium ion batteries have high energy density, they are also being applied to industrial large electric devices such as electric vehicles.

  FIG. 11 is an exploded perspective view showing a schematic configuration of a nonaqueous electrolyte secondary battery according to a conventional technique (see, for example, Patent Document 1). As shown in FIG. 11, the nonaqueous electrolyte secondary battery 100 is a hexahedral battery made up of an open box-shaped container body 110 having an opening 110 x and a plate-shaped lid 120, each made of aluminum. A container is provided as an exterior.

  The power generation element 111 has a configuration in which a positive electrode plate and a negative electrode plate, which are band-like electrode plates, are wound into a long cylindrical shape via a separator. In the wound state, the positive electrode plate and the negative electrode plate are arranged with their positions shifted in different directions at both ends of the winding shaft, and project from the separator with a predetermined width at both ends of the power generation element 111. Furthermore, the active material is not carried on the protruding portion of each electrode plate, and the metal foil as the base material is exposed. The positive electrode side metal foil portion 111a and the negative electrode side metal foil portion 111a ′ that protrude from both ends of the power generation element 111 are electrically conductive metal plates, that is, a positive electrode side current collector 112 and a negative electrode side current collector 112. 'Is connected to each other.

  One end of the current collector 112 extends parallel to the upper surface of the power generation element 111, and a through hole 112a is formed on the surface. Further, the other end is bent toward the side surface of the power generation element 111 and is sandwiched by a sandwiched metal plate 114 made of metal such as aluminum together with the wound positive electrode side metal foil portion 111a exposed on the side surface of the power generation element 111. Connected and fixed by sonic welding or the like. The current collector 112 'on the negative electrode side has the same configuration, but the metal material is copper or the like.

  Further, through holes for terminal lead-out are opened at both ends of the lid 120. In FIG. 11, only the positive electrode side through hole 120 a is shown, and the negative electrode side through hole is not shown because it is hidden behind a component to be described later.

  An insulating sealing material 113 is located between the lid 120 and the current collector 112. The insulating sealing material 113 is a synthetic resin member having an insulating property and a certain elasticity, such as a synthetic resin, and concentric with the through hole 120a of the lid 120 and the through hole 122a of the current collector 112 on its surface. A through hole 113a is formed.

  Furthermore, the insulating sealing material 121 is positioned so as to overlap with the vicinity of the end on the short side of the lid 120. The insulating sealing material 121 is a member made of a synthetic resin similar to the insulating sealing material 113, and a through hole 121 b concentric with the through hole 120 a of the lid 120 is formed on the surface thereof. Moreover, the cylinder part 121c is formed in the side facing the cover part 120 of the insulating sealing material 121, and the through-hole 121b is extended in the cylinder part 121c. The cylindrical portion 121c has an outer shape corresponding to the through holes 120a and 113a, and is fitted into each of the through holes.

  The electrode terminal 130 is arranged so as to cover the main surface of the insulating sealing material 121. The electrode terminal 130 has a planar shape corresponding to the shape of the main surface of the insulating sealing material 121, and an electrode portion 130a made of aluminum, an aluminum alloy or other conductive metal, and a connecting member 130b protruding from the surface of the electrode portion 130a. Consists of The connection member 130b is a conductive metal part such as aluminum, copper, or an alloy thereof, and the tip of the connection member 130b is caulked while being passed through the through hole 112a of the current collector 112. While electrically connecting the electric body 111, it plays the role which connects the cover part 120 and the electric power generation element 111 mechanically.

  Next, a through hole 122 is opened at a position on the surface of the lid 120 and adjacent to the edge 120b near the longitudinal direction. Here, as shown in the cross-sectional view of the main part of FIG. 12, the through-hole 122 penetrates from the front surface to the back surface of the lid portion 120, so that the power generation element 111 is accommodated and then opened by laser welding to the lid portion 120. 110 communicates with the internal space of the sealed container body 110.

  After the electrolytic solution is injected into the container body 110 through the through hole 122, a metal sealing plug 123 is fitted into the through hole 122. The periphery of the sealing plug 123 is sealed by laser welding with the surface of the lid 120, thereby completing the nonaqueous electrolyte secondary battery 100. 12 is a cross-sectional view taken along a straight line Y in the drawing that is parallel to the short direction of the lid 120 of the nonaqueous electrolyte secondary battery 100 of FIG. 11 and orthogonal to the extending direction of the through-hole 122. .

  With such a configuration, the electric power generated in the power generation element 111 is taken out of the container body 110 through the current collector 112 and the electrode terminal 130. Specifically, the external connection (not shown) is fixed to the main surface of the electrode terminal 130 by welding to complete the electrical connection between the non-aqueous electrolyte secondary battery 100 and the external load.

Japanese Patent No. 4110632

  The configuration of the non-aqueous electrolyte secondary battery according to the conventional technique is as described above. However, the conventional technique has the following problems.

  That is, the injection of the electrolytic solution is performed in a state where the inside of the container body 110 in which the opening 110x is weld-sealed by the lid portion 120 is maintained in a negative pressure state, and is ejected from the through hole 122 with a constant momentum. As shown, the through hole 122 faces the power generation element 111 inside the container body 110.

  As a result, the injected electrolytic solution collides with the surface of the power generation element 111 and a part thereof recoils toward the through hole 122. As a result, the injection of the electrolytic solution is hindered, and it takes a long time to complete the injection.

  As described above, in a power storage device such as a non-aqueous electrolyte secondary battery according to the prior art, there is a problem that it takes time to inject an electrolytic solution, a manufacturing process is lengthened, and productivity is lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a storage element that can quickly inject an electrolyte solution and has excellent productivity, and a storage container member used therefor. To do.

In order to achieve the above object, the first aspect of the present invention provides:
Power generation elements,
A storage container for storing the power generation element;
On one surface of the storage container, a liquid injection path that is sealed from the front surface through the back surface is formed,
The position of the opening on the back surface of the liquid injection path coincides with or substantially coincides with the direction in which the distance between the one surface in the direction perpendicular to the one surface and the surface of the power generation element increases, and the surface of the liquid injection path Moving from a position directly opposite the position of the opening in
It is a power storage element.

The second aspect of the present invention is
Power generation elements,
A storage container for storing the power generation element;
On one surface of the storage container, a liquid injection path that is sealed from the front surface through the back surface is formed,
The shape and / or size of the opening on the back surface of the liquid injection channel is the same as or substantially the same as the direction in which the distance between the one surface in the direction perpendicular to the one surface and the surface of the power generation element increases. Is deformed,
It is a power storage element.

The third aspect of the present invention is
The liquid injection path coincides with or substantially coincides with a direction in which the distance between the one surface and the surface of the power generation element in a direction perpendicular to the one surface is increased, and at least a part of the inner wall is curved or bent.
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 cross-sectional shape parallel to the one surface of the liquid injection path is enlarged as at least a part thereof approaches the back surface from the front surface.
It is an electrical storage element of the 1st to 3rd side surface of this invention.

The fifth aspect of the present invention is
The cross-sectional shape parallel to the wall surface of the storage container of the liquid injection path is gradually expanded as the back surface approaches the back surface.
It is an electrical storage element of the 4th side surface of this invention.

The sixth aspect of the present invention is
The cross-sectional shape is anisotropically enlarged with respect to the one surface from the front surface toward the back surface,
It is an electrical storage element of the 4th or 5th side surface of this invention.

The seventh aspect of the present invention is
At least a part of the position of the cross section parallel to the one surface of the liquid injection path is continuously moving from the front surface to the back surface.
It is an electrical storage element of the 1st to 6th side surface of this invention.

The eighth aspect of the present invention is
The position of the cross section of the liquid injection path parallel to the one surface is moving in stages as it approaches the back surface from the front surface.
It is an electrical storage element of the 1st to 6th side surface of this invention.

The ninth aspect of the present invention is
The direction of movement of the cross section coincides with or substantially coincides with the direction in which the distance between the one surface and the surface of the power generation element in the direction perpendicular to the one surface is increased.
It is an electrical storage element of the 7th or 8th side surface of this invention.

The tenth aspect of the present invention provides
The opening on the front surface and the opening on the back surface of the liquid injection channel are partially overlapped when viewed from a direction orthogonal to the opening on the surface.
It is an electrical storage element of the 1st thru | or 9th side surface of this invention.

The eleventh aspect of the present invention is
The liquid injection path goes straight a certain distance from the opening in the surface,
1 is a power storage device according to any one of the first to tenth aspects of the present invention.

The twelfth aspect of the present invention is
A storage container member capable of storing a power generation element, which constitutes a storage container for a storage element,
A liquid injection path that penetrates from the front surface to the back surface is formed,
The position of the opening on the back surface of the liquid injection path coincides with or substantially coincides with the direction in which the distance between the one surface in the direction perpendicular to the one surface and the surface of the power generation element increases, and the surface of the liquid injection path Moving from a position directly opposite the position of the opening in
It is a storage container member.

The thirteenth aspect of the present invention provides
A storage container member capable of storing a power generation element, which constitutes a storage container for a storage element,
A liquid injection path that penetrates from the front surface to the back surface is formed,
The shape and / or size of the opening on the back surface of the liquid injection channel is the same as or substantially the same as the direction in which the distance between the one surface in the direction perpendicular to the one surface and the surface of the power generation element increases. Is deformed,
It is a storage container member.

  According to the present invention as described above, there is an effect that it is possible to improve the productivity of the storage element.

(A) The principal part top view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention (b) The principal part which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention Cross section (A) The principal part top view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention (b) The principal part which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 1 of this invention Cross section (A) The principal part top view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention (b) The principal part which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 2 of this invention Cross section (A) The principal part top view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention (b) The principal part which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 3 of this invention Cross section (A) The principal part top view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 4 of this invention (b) The principal part which shows the structure of the nonaqueous electrolyte secondary battery which concerns on Embodiment 4 of this invention Cross section (A) Main part plan view showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 5 of the present invention (b) Main part showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 5 of the present invention Cross section (A) Main part plan view showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 6 of the present invention (b) Main part showing the configuration of the nonaqueous electrolyte secondary battery according to Embodiment 6 of the present invention Cross section (A) Main part sectional drawing which shows the other structural example of the non-aqueous electrolyte secondary battery which concerns on embodiment of this invention (b) Other structural example of the non-aqueous electrolyte secondary battery which concerns on embodiment of this invention Sectional view showing the main parts (A) Main part sectional drawing which shows the other structural example of the non-aqueous electrolyte secondary battery which concerns on embodiment of this invention (b) Other structural example of the non-aqueous electrolyte secondary battery which concerns on embodiment of this invention Sectional view showing the main parts (A) The principal part top view which shows the other structural example of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The other structural example of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention The principal part top view which shows An exploded perspective view showing a configuration of a conventional non-aqueous electrolyte secondary battery Cross-sectional view of relevant parts showing the configuration of a conventional non-aqueous electrolyte secondary battery

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

(Embodiment 1)
The non-aqueous electrolyte secondary battery according to the embodiment of the present invention is characterized in the through hole provided in the lid portion 120 in the above-described conventional non-aqueous electrolyte secondary battery. Therefore, other configurations are the same as those of the conventional example. In the following embodiments, the same or corresponding one-to-one components are denoted by the same reference numerals and detailed description thereof will be made with reference to FIG. Omitted.

  Next, FIG. 1A is a main part plan view showing a schematic configuration of the nonaqueous electrolyte secondary battery 1 according to Embodiment 1 of the present invention. As shown in FIG. 1 (a), the through hole 10 of the first embodiment is opened on the surface 120c of the lid 120 and at an inward position of the lid surface 120c from the edge 120b. Yes.

  Moreover, FIG.1 (b) is sectional drawing by the AA straight line of Fig.1 (a). As shown in FIG. 1B, the through hole 10 is formed as a liquid injection path 11 extending from the front surface 120 c to the back surface 120 d of the lid portion 120, and the liquid injection path 11 is bent in the lid portion 120. It is configured as a route.

  2 (a) and 2 (b), the configuration in the vicinity of the liquid injection path 11 shown in the region R of FIG. 1 (b) is enlarged and described in detail. As shown in the cross-sectional view of FIG. 2B, the liquid injection path 11 has openings 10 a and 10 b provided as the through holes 10 on the front surface 120 c and the back surface 120 d of the lid portion 120, respectively.

  And the liquid injection path 11 goes straight along the thickness direction (arrow β in FIG. 2B) from the opening 10a, that is, the sub liquid injection path 11a formed perpendicular to the surface 120c. The sub liquid injection path 11b is formed to be inclined from the sub liquid injection path 11a. Here, the direction in which the sub-injection path 11b is inclined corresponds to the direction from the center of the lid 120 toward the edge 120b (arrow α in FIGS. 2A and 2B).

  As shown in FIGS. 2 (a) and 2 (b), the opening 10a overlaps the boundary between the sub-injection passage 11a and the sub-injection passage 11b, and the opening 10b is a lid from the position of the opening 10a. It is located at a location away from the edge 120b of the portion 120. Furthermore, the cross section of an arbitrary plane parallel to the surface 120c of the lid 120 of the liquid injection path 11 is continuously moved as shown in FIGS. 2 (a) and 2 (b). The trajectory of the movement of the cross section forms the liquid injection path 11.

  In the above configuration, the non-aqueous electrolyte secondary battery 1 corresponds to the power storage element of the present invention, the combination of the container body 110 and the lid 120 corresponds to the storage container of the present invention, and the power generation element 111 corresponds to the power generation element of the present invention. Corresponds to the element. Moreover, the liquid injection path 11 as the through hole 10 corresponds to the liquid injection path of the present invention. Further, the lid 120 corresponds to the storage container member of the present invention.

  Such a nonaqueous electrolyte secondary battery 1 of the present embodiment has the following effects. That is, in the nonaqueous electrolyte secondary battery 1, the distance between the back surface 120d of the lid 120 and the surface of the power generation element 111 is the distance D1 from the top portion and the distance D2 from the side edge in FIG. As shown as, it becomes large as it goes to the side edge from the top portion. Correspondingly, in the through hole 10 as the liquid injection path 11 of the present embodiment, the position of the opening 10b formed in the back surface 120d of the lid 120 moves to the side of the power generation element 111, and the opening 10b And the power generation element 111 are made larger.

  As a result, the momentum of collision of the electrolyte discharged from the opening 10b with the power generation element 111 is reduced or the momentum until reaching the surface of the power generation element 111 is reduced, thereby reducing the influence of recoil. .

  Further, in the present embodiment, the liquid injection path 11 is bent from the secondary liquid injection path 11a, and has the secondary liquid injection path 11b extending obliquely toward the edge 120b of the lid 120, The injection direction of the electrolyte injected from outside in the container main body 110 is inclined with respect to the back surface 120 d of the lid 120.

  Here, as shown in FIG. 1 (b), the direction in which the sub-injection channel 11 b is inclined corresponds to the outer shape of the wound power generation element 111. Specifically, the inclination of the sub-injection channel 11b is along a curve formed from the top portion to the side end of the power generation element 111. As a result, the electrolyte discharged from the opening 10b gently slides down to the side end along the curved surface of the power generation element 111.

  From the above, the electrolyte injected from the lid can be promptly introduced into the storage container, and the production efficiency of the nonaqueous electrolyte secondary battery 1 can be improved.

  Further, in the present embodiment, as shown in the plan view of the main part of FIG. 2A, the opening 10b on the back surface 120d side of the lid 120 and the lid 120 of the through hole 10 constituting the liquid injection path 11. A part of the opening 10b on the surface 120a side overlaps with each other, and shares the penetration region 10c where the inner surface can be seen from the outer surface of the lid 120.

  Thereby, resistance resulting from the bent shape of the liquid injection path 11 can be reduced, and the electrolyte introduced from the opening 10a can be smoothly guided to the opening 10b.

  Further, in the present embodiment, the sub-injection channel 11b is formed on a straight line as a trajectory in which a section in an arbitrary plane parallel to the surface 120c from the opening 10a to the opening 10b continuously moves. . Thereby, the flow of the electrolyte in the liquid injection path 11 becomes smooth, and the liquid injection efficiency can be increased.

  Furthermore, in the present embodiment, as shown in FIG. 2B, the auxiliary liquid injection path 11 a is formed so as to go straight in a direction perpendicular to the surface 120 a of the lid portion 120. Thereby, as shown in FIG.1 (b), the auxiliary | assistant liquid injection path 11a can be sealed using the sealing stopper 123 of the structure similar to a prior art example. Note that the length of the sub-injection channel 11a (the dimension in the direction along the arrow β in the figure) is sufficient to seal the opening 10a because the flange of the sealing plug 123 abuts on the periphery of the opening 10a. It is suitable that it is more than the fitting part of the stopper plug 123.

  In addition, in order to create the lid part 120 in which the through-hole 10 is formed, a mold constituted by an upper mold and a lower mold that are divided into two along the boundary line B shown in FIG. 2B may be used. For example, the through hole 10 of the present embodiment can be easily created by configuring the upper mold as a shape corresponding to each of the sub-liquid injection path 11a and the lower mold as the sub-liquid injection path 11b.

  Furthermore, in the present embodiment, the through hole 10 is provided near the edge 120b of the lid 120. This is for the following reason.

  The through hole 10 serving as the liquid injection path 11 needs to be separated from the edge 120 of the lid 120 by a certain distance for reasons such as securing a welded portion between the lid 120 and the container body 110.

  A wide battery has a degree of freedom in setting the position of the through hole, and even if the through hole is set away from the edge, the top portion of the power generating element can be avoided. However, in the case of a narrow battery having an extremely rectangular shape in a plan view, like the lid portion 120 of the present embodiment, the liquid injection path 11 is connected to the lid portion due to the minimum required separation distance from the edge portion. It is not uncommon for the position to be set near the center of 120, that is, near the top of the power generation element. Even in such a case, the present invention is suitable because rapid liquid injection can be realized while avoiding recoil or the like according to the slope of the power generation element.

  As described above, according to the nonaqueous electrolyte secondary battery 1 of the first embodiment, the liquid injection composed of the through holes 10 having the openings 10a and 10b whose positions are different between the front surface and the back surface of the lid portion. By having the path 11, the electrolytic solution can be quickly injected into the storage container, and the productivity of the nonaqueous electrolyte secondary battery 1 can be improved.

(Embodiment 2)
The nonaqueous electrolyte secondary battery according to the embodiment of the present invention is characterized by the shape of the sub-injection channel 11b that is directly connected to the opening 10b of the back surface 120d of the lid 120.

  Hereinafter, description will be made with reference to FIGS. Here, FIG. 3A is a main part plan view showing a configuration of the nonaqueous electrolyte secondary battery 1 according to Embodiment 2 of the present invention, and FIG. 1B is a plan view of FIG. It is principal part sectional drawing of Fig.2 (a) corresponding to the relationship of b), and attaches | subjects the same code | symbol to the part which is the same as that of Embodiment 1, or corresponds, and abbreviate | omits detailed description.

  As shown in FIG. 3A, in the liquid injection path 11 according to the second embodiment, the positions of the openings 10a and 10b as the through holes 10 are the same as those in the first embodiment. It is located in the place away from the side. Further, as shown in FIG. 3B, both the opening 10a and the opening 10b overlap the boundary between the sub-injection path 11a and the sub-injection path 11b.

  Further, as shown in FIG. 3 (b), in the second embodiment, the sub liquid injection path 11b is also formed perpendicular to the back surface 120d, like the sub liquid injection path 11a. The cross section of an arbitrary surface parallel to the lid portion surface 120c of the liquid injection path 11 is moved stepwise as shown in FIGS. 3 (a) and 3 (b). The trajectory of the movement of the cross section forms the liquid injection path 11. In other words, the liquid injection path 11 is a combination of two through-holes that partially overlap each other and that go straight perpendicular to the lid 120.

  Even in the case of such a configuration, since the position of the opening 10b is moved, the distance between the opening 10b and the power generation element 111 can be increased as in the first embodiment, and the opening 10b The effect of reducing the momentum of collision between the electrolyte discharged from the generator and the power generation element 111 or reducing the momentum until reaching the surface of the power generation element 111 is achieved.

  Furthermore, in the second embodiment, by adopting a configuration in which the sub-injection path 11b also advances straight, the shape of the mold can be simplified, and the manufacturing cost can be reduced.

  In addition, in FIG.3 (b), although the length of the sub injection path 11a was shown as a thing shorter than the length of the sub injection path 11b, it is good also as a structure where the same or sub injection path 11b is shorter. However, it is more preferable to shorten the sub-injection path 11 a because the electrolyte discharged from the opening 11 b can be diffused toward the side end of the power generation element 111.

(Embodiment 3)
The nonaqueous electrolyte secondary battery according to Embodiment 3 of the present invention is characterized in that the size of the opening 10b on the back surface 120d of the lid 120 is changed to be larger than that of the opening 10a. .

  Hereinafter, description will be made with reference to FIGS. As shown to Fig.4 (a), the liquid injection path 11 of this Embodiment 3 is the through-hole 10, and the sub-liquid injection path 11a which has the opening 10a of the shape similar to Embodiment 1, 2, and opening. The sub liquid injection path 11b has an opening 10b which is inscribed in a plan view and has an inner diameter larger than the opening 10a. As shown in FIGS. 4 (a) and 4 (b), the opening 10a overlaps the boundary between the sub-injection passage 11a and the sub-injection passage 11b, and the opening 10b has the same shape as the opening 10a. While maintaining, it continuously expands from the position of the opening 10a toward the edge 120b of the lid 120.

  Further, as shown in FIG. 4B, the auxiliary liquid injection path 11b shares the side wall of the auxiliary liquid injection path 11a with the side wall near the center of the lid portion 120 (near the top portion of the power generation element 120). The side wall near the edge 120b of the portion 120 (near the side end of the power generation element 120) is inclined, and has a truncated cone shape as a whole. Therefore, the sub-injection channel 11b is connected to the opening 10b while increasing the inner diameter from the boundary with the sub-injection channel 11a. From the opening 10a to the opening 10b, an arbitrary parallel to the lid surface 120c of the injection channel 11 The cross section at the surface continuously expands, and the trajectory of the expansion of the cross section forms the sub-injection channel 11b.

  Such a nonaqueous electrolyte secondary battery 1 of Embodiment 3 has the following effects. That is, the cross-sectional shape of the auxiliary liquid injection path 11b in the extending direction of the auxiliary liquid injection path 11a (the direction along the central axis O of the opening 10a in the drawing) corresponds to the shape from the top portion of the power generation element 111 to the side end. And it becomes large, decentering in the direction toward the edge 120b of the lid 120.

  Thus, as in the case of the first embodiment, the distance between the opening 10b and the power generation element 111 is increased, and the momentum of collision between the electrolyte discharged from the opening 10b and the power generation element 111 is reduced, or the power generation element There is an effect of reducing the momentum until the surface of 111 is reached.

  Further, since the electrolyte discharged from the opening 10b is diffused along the inclined inner wall of the sub-injection channel 11b, the electrolyte discharged from the opening 10b spreads toward the side end of the power generation element 111. Gently slide down to the side edges along the curved surface.

  From the above, as in the first embodiment, also in the third embodiment, the electrolyte injected from the lid can be quickly introduced into the storage container, and the non-aqueous electrolyte secondary battery 1 is manufactured. Efficiency can be improved.

  Furthermore, in the third embodiment, as shown in the cross-sectional view of the main part in FIG. 4B, the sub-injection channel 11b has a larger inner diameter than the sub-injection channel 11a as a whole, so that the flow rate can be increased. The inner wall is not inclined in a direction against the flow of the electrolyte.

  Thereby, the electrolyte introduced from the opening 10a can be smoothly guided to the opening 10b.

  Further, also in this embodiment, since the sub liquid injection path 11a has the same shape as that of the first and second embodiments, the sub liquid injection path 11a is sealed using the sealing plug 123 having the same configuration as the conventional example. Can be stopped.

  Further, in order to create the lid portion 120 in which the through-hole 10 is formed, a mold composed of an upper mold and a lower mold divided along a boundary line B shown in FIG. 4B may be used. The shape of the mold of the sub-injection channel 11b is a shape that converges toward the tip, is easy to manufacture, and can easily create the through hole 10 of the present embodiment.

  In addition, in order to create the lid portion 120 of the third embodiment, the sub liquid injection paths 11a and 11b are simultaneously formed by press molding with the upper mold and the lower mold, and the sub liquid injection path is first formed on the back surface 120d side. After forming the sub-injection channel 11b by press molding or the like using a mold corresponding to the shape of 11b, punching is performed from the surface 120c side using the die corresponding to the sub-injection channel 11a, The sub-injection channel 11 a may be formed by removing a portion corresponding to the liquid channel from the lid 120.

(Embodiment 4)
The nonaqueous electrolyte secondary battery according to Embodiment 4 of the present invention is characterized in that, in the configuration of Embodiment 3, the shape of the sub-injection channel 11b directly connected to the opening 10b is the same as that of Embodiment 2. . Hereinafter, description will be made with reference to FIGS.

  As shown in FIG. 5 (a), in the liquid injection path 11 of the fourth embodiment, the shape of the opening 10b as the through hole 10 is inscribed in the plan view in the same way as the third embodiment, and Has an enlarged inner diameter.

  Next, as shown in FIG. 5 (b), both the opening 10a and the opening 10b overlap the boundary between the sub liquid injection path 11a and the sub liquid injection path 11b, and the opening 10b is located on the boundary. , It expands in one step toward the edge 120b of the lid 120.

  Furthermore, in the present fourth embodiment, the sub liquid injection path 11b is also formed perpendicular to the back surface 120d from the opening 10b, like the sub liquid injection path 11b of the second embodiment. Therefore, as shown in each drawing of FIG. 3B, the cross section at an arbitrary plane parallel to the lid portion surface 120c of the liquid injection path 11 from the opening 10a to the opening 10b is enlarged step by step (one step). Even so, the liquid injection path 11 is a combination of two through-holes that go straight and have different inner diameters and partly overlapping each other.

  Even in the case of having such a configuration, since the inner diameter of the opening 10b is enlarged, the distance between the opening 10b and the power generation element 111 can be increased as in the third embodiment. The effect of reducing the momentum of collision between the electrolyte discharged from the generator and the power generation element 111 or reducing the momentum until reaching the surface of the power generation element 111 is achieved.

  Furthermore, in the fourth embodiment, by adopting a configuration in which the sub-injection channel 11b also goes straight, the shape of the mold can be simplified, and the manufacturing cost can be reduced.

  In FIG. 5B, the length of the sub liquid injection path 11a is shown as being shorter than the length of the sub liquid injection path 11b, but the same or the sub liquid injection path 11b may be configured shorter. However, it is more preferable to shorten the sub-injection path 11a because the electrolyte discharged from the opening 11b can be diffused toward the side end of the power generation element 111 as in the second and third embodiments. It is.

  Also in the fourth embodiment, the lid 120 is produced by simultaneously forming the sub-injection channels 11a and 11b by press molding using the upper mold and the lower mold, and pressing the back surface 120d side and the front surface 120c side. Molding and punching may be performed in order.

(Embodiment 5)
In the nonaqueous electrolyte secondary battery according to Embodiment 5 of the present invention, the size of the opening 10b on the back surface 120d of the lid 120 is changed to be larger than that of the opening 10a, and the position is also moved. It is characterized by that.

  Hereinafter, description will be made with reference to FIGS. 6 (a) and 6 (b). As shown in FIG. 6 (a), the liquid injection path 11 according to the fifth embodiment includes, as a through hole 10, a sub liquid injection path 11a having an opening 10a having the same shape as that of the first and second embodiments, and an opening. The sub liquid injection path 11b has an inner diameter larger than 10a and has an opening 10b provided at a position moved from the opening 10a toward the edge 120 of the lid 120.

  Further, as shown in FIG. 6B, the sub liquid injection path 11b is inclined with respect to the sub liquid injection path 11a in the same manner as the sub liquid injection path 11b of the first embodiment. The inclination angle θ1 of the side wall near the edge 120b (near the side edge of the power generation element 120) is larger than the inclination angle θ2 of the side wall near the center of the lid 120 (near the top portion of the power generation element 120). Therefore, the secondary liquid injection path 11b is continuously extended from the secondary liquid injection path 11a while continuously increasing the inner diameter at an arbitrary plane parallel to the surface 120c of the lid 120 from the boundary with the secondary liquid injection path 11a. It continues to the opening 10b while moving away.

  Such a nonaqueous electrolyte secondary battery 1 according to Embodiment 5 has the following effects. That is, the cross-sectional shape of the auxiliary liquid injection path 11b in the extending direction of the auxiliary liquid injection path 11a (the direction along the central axis O of the opening 10a in the drawing) corresponds to the shape from the top portion of the power generation element 111 to the side end. And it becomes large, decentering in the direction toward the edge 120b of the lid 120.

  Thus, as in the case of the first embodiment, the distance between the opening 10b and the power generation element 111 is increased, and the momentum of collision between the electrolyte discharged from the opening 10b and the power generation element 111 is reduced, or the power generation element There is an effect of reducing the momentum until the surface of 111 is reached.

  Further, since the electrolyte discharged from the opening 10b is diffused along the inclined inner wall of the sub-injection channel 11b, the electrolyte discharged from the opening 10b spreads toward the side end of the power generation element 111. Gently slide down to the side edges along the curved surface.

  From the above, also in the fifth embodiment, the electrolyte injected from the lid can be quickly introduced into the storage container, and the manufacturing efficiency of the nonaqueous electrolyte secondary battery 1 can be improved. It has become.

  Furthermore, in the fifth embodiment, as shown in the cross-sectional view of the main part in FIG. 6B, the sub-injection channel 11b has a larger inner diameter than the sub-injection channel 11a as a whole, so that the flow rate can be increased. In addition, since the inclination angle θ2 of the side wall near the center of the lid 120 is smaller than the inclination angle θ1 of the lid 120 near the lid 120b, resistance to the flow of the electrolyte is suppressed.

  Thereby, the electrolyte introduced from the opening 10a can be more smoothly guided to the opening 10b.

  Further, also in this embodiment, since the sub liquid injection path 11a has the same shape as in the first to fourth embodiments, the sub liquid injection path 11a is sealed using the sealing plug 123 having the same configuration as the conventional example. Can be stopped.

  Moreover, in order to create the lid part 120 in which the through hole 10 is formed, a mold constituted by an upper mold and a lower mold divided along a boundary line B shown in FIG. 6B may be used. The shape of the mold of the sub-injection channel 11b is a shape that converges toward the tip, is easy to manufacture, and can easily create the through hole 10 of the present embodiment.

(Embodiment 6)
The nonaqueous electrolyte secondary battery according to Embodiment 6 of the present invention is characterized in that, in the configuration of Embodiment 5, the shape of the sub-injection passage 11b directly connected to the opening 10b is the same as that of Embodiment 2 or 4. And Hereinafter, description will be made with reference to FIGS.

  As shown in FIG. 7 (a), in the liquid injection path 11 of the sixth embodiment, the opening 10b as the through hole 10 is directed from the opening 10a to the edge 120b of the lid 120, as in the sixth embodiment. And has an inner diameter that is larger than that of the opening 10a.

  Next, as shown in FIG. 7 (b), in the sixth embodiment, the sub liquid injection path 11b is also formed from the opening 10b to the back surface 120d in the same manner as the sub liquid injection path 11b of the second or fourth embodiment. Are formed vertically. Therefore, the liquid injection path 11 has a cross-sectional shape similar to that of the second and fourth embodiments, and is a combination of two straight through holes that have mutually different inner diameters and partially overlap each other. ing.

  Even in the case of such a configuration, the position of the opening 10b is moved and the inner diameter thereof is enlarged, so that the distance between the opening 10b and the power generation element 111 is further increased as in the above embodiments. The effect of reducing the momentum of collision between the electrolytic solution discharged from the opening 10b and the power generation element 111 or reducing the momentum until reaching the surface of the power generation element 111 is achieved.

  Furthermore, in the sixth embodiment, the area of the through region 10c where the opening 10a and the opening 10b overlap can be increased, and therefore the amount of electrolyte introduced can be increased.

  Furthermore, in the sixth embodiment, the sub-fluid injection path 11b is also configured to go straight perpendicular to the lid portion 120, so that the shape of the mold can be simplified and the manufacturing cost can be reduced. Become.

  In FIG. 7B, the length of the sub liquid injection path 11a is shown as being shorter than the length of the sub liquid injection path 11b, but the same or the sub liquid injection path 11b may be configured shorter. However, it is more preferable to shorten the sub-injection path 11a because the electrolyte discharged from the opening 11b can be diffused toward the side end of the power generation element 111 as in the second and third embodiments. It is.

  As described above, according to the nonaqueous electrolyte secondary battery 1 of the embodiment of the present invention, the position of the opening 10b on the back surface 120d side in the through-hole 10 that is the injection path 11 provided in the lid 120 is By moving the power generation element 111 closer to the side end and / or by expanding the shape of the opening 10b from the opening 10a, the electrolyte can be quickly introduced into the storage container.

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

  In the above description, the secondary liquid injection path 11b constituting the liquid injection path 11 is inclined with respect to the secondary liquid injection path 11a as shown in the respective cross-sectional views of FIG. 2 (b), FIG. 3 (b) and the like. Although the description has been given on the assumption that the liquid injection path 11 has a configuration bent at a right angle, that is, the liquid injection path 11 is bent in the lid portion 120, the liquid injection path of the present invention is shown in FIG. As such, the sub-injection channel 11b may be curved. In this case, the introduction efficiency can be increased by changing the direction of the flow of the electrolyte in the liquid injection path more smoothly.

  In the above description, as shown in FIG. 4B or FIG. 6B, the side wall of the sub-injection channel 11b near the center of the lid 120 (near the top portion of the power generation element 120) is As described in FIG. 8B, the sub-injection channel 11a is vertical or inclined toward the edge 120b of the lid 120 (close to the side edge of the power generation element 120). The side wall may be inclined toward the center of the lid 120. However, the inclination angle θ3 is always larger than the inclination angle θ4 in order to make the direction of deformation of the cross-sectional shape of the liquid injection path anisotropic so as to coincide with each embodiment.

  In this case, it is possible to increase the injection efficiency by expanding the discharge amount of the electrolytic solution in the injection path while maintaining the effects of the respective embodiments. In the configuration example of FIG. 8B as well, the lid 120 is created by simultaneously forming the sub-injection channels 11a and 11b by press molding using the upper mold and the lower mold, as well as the back surface 120d side and the front surface 120c side. The press molding and the punching molding may be performed in order.

  In the above description, the liquid injection path 11 is configured to have the secondary liquid injection path 11a that goes straight in order to fit the sealing plug 123, but the liquid injection path of the present invention is shown in FIG. ), The sub-injection passage 11a may be omitted, and the shape may be continuous to the opening 10b while changing the cross-sectional shape directly from the opening 10a. In this case, the configuration can be simplified and the manufacturing efficiency can be increased. Furthermore, the sub-injection channel 11a may have a tapered shape toward the lid 120 as shown in FIG. 9B. In this case, the mechanical coupling force with the sealing plug 123 can be increased.

  In short, in the liquid injection path of the present invention, the position of the opening on the back surface of the lid portion is moved closer to the side end of the stored power generation element than the position of the opening on the surface, or on the back surface of the lid portion. The shape of the opening only needs to be deformed from the shape of the opening on the surface so as to be closer to the side end of the housed power generation element, and is not limited by the cross-section or other specific shapes.

  Further, in the above description, the shape of the opening 10b provided on the back surface 120d of the lid 120 is similar to the shape of the opening 10b provided on the back 120d of the lid 120. The shape may be modified to be different from the shape of the opening 10b. As an example, FIG. 10A shows a case where the opening 10b is rectangular. Since a large opening area can also be taken in the longitudinal direction of the lid part 120, the discharge amount of the electrolytic solution in the liquid injection path can be increased, and the liquid injection efficiency can be increased. Since the distance between the power generation element 111 and the back surface 120d of the lid 120 is constant in the longitudinal direction of the lid 120, the discharge direction of the electrolytic solution is not easily affected by deformation in this direction.

  Further, as shown in FIG. 10B, the opening 10b may be deformed into a fan shape that requires the opening 10a. In this case, since the discharge direction of the electrolytic solution can be regulated toward the side end of the power generation element 111, it is possible to further improve the liquid injection efficiency.

  In short, the opening on the back surface of the storage container according to the present invention may be changed in shape or size so as to coincide with the direction in which the distance between the back surface 120c and the surface of the power generation element 111 increases. Therefore, the opening 10b may be deformed such that the area is increased by expanding the size with the same shape as the opening 10a as in the above-described third to fifth embodiments, or even if the shape changes. You may deform | transform so that an area may become fixed.

  10A and 10B is based on the third, fourth, etc., it may be realized in the first, second, etc. 10 (a) and 10 (b), the lid 120 is created by simultaneously forming the sub-injection passages 11a and 11b by press molding using the upper mold and the lower mold, as well as the back surface 120d side and the front surface. What is necessary is just to perform press molding and stamping in order on the 120c side.

  In the above description, the direction of movement of the position of the opening of the present invention, the direction of change in shape or size is the direction between the back surface 120d and the surface of the power generation element 111 in the direction perpendicular to the back surface 120d of the lid 120. The power generation element has a shape change corresponding to the direction in which the distance increases. However, the shape change of the power generation element is not limited as long as it is curved from the top portion to the side edge as a whole. It is not necessary to match until following a partial shape change due to errors, tolerances and design convenience.

  In the above description, the power generation element of the present invention is a winding type, but may be a stacked type power generation element.

  In the above description, the storage element of the present invention is a non-aqueous electrolyte secondary battery 1 typified by a lithium ion secondary battery. However, if the battery can be charged and discharged by an electrochemical reaction, Nickel metal hydride batteries and other various secondary batteries may be used. Moreover, a primary battery may be sufficient. Furthermore, it may be an element that directly stores electricity as electric charges, such as an electric double layer capacitor. In short, the power storage element of the present invention is not limited by its specific method as long as it can store electricity.

  In the above description, the storage container of the present invention is composed of the container main body 110 and the lid part 120, and the through hole 10 is provided in the lid part 120. However, the liquid injection path of the present invention is the container main body. 110 may be provided, and the storage container member of the present invention may be realized as the container body 110 alone. In short, the present invention only needs to have a liquid injection path as a through-hole provided at an arbitrary position of the storage container, and a mode of coupling the lid portion and the container body constituting the storage container, and further the storage container It is not limited by the type, shape, and number of members that constitute the.

  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 that it is possible to provide a power storage element excellent in productivity and a storage container member used therefor, and is useful in a power storage element such as a secondary battery.

DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 10 Through-hole 10a, 10b Opening 10c Through area 11 Injection path 11a Sub-injection path 11b Sub-injection path 110 Container main body 111 Power generation element 120 Lid part 120b Edge part 120c Surface 120d Back surface 123 Sealing mouth

Claims (11)

Power generation elements,
A storage container for storing the power generation element;
On one surface of the storage container, a liquid injection path that is sealed from the front surface through the back surface is formed,
Said match the direction and one in which distance increases between the one surface and the surface of the power generating element in a direction perpendicular to one side, the position of the opening in the back surface of the pouring path, the openings in the surface of the pouring path Has moved from a position directly opposite the position,
The pouring channel, said one side to said one side said match the direction and one in which distance increases between the surface of the power generating element and in a direction perpendicular, at least a portion of the inner wall is curved or bent,
Power storage element. Power generation elements,
A storage container for storing the power generation element;
On one surface of the storage container, a liquid injection path that is sealed from the front surface through the back surface is formed,
Said match the direction and one in which distance increases between the one surface and the surface of the power generating element in a direction perpendicular to the one surface, the shape and / or size of the back aperture of the pouring path variations to the surface doing,
Power storage element. The pouring channel, said one side to said one side said match the direction and one in which distance increases between the surface of the power generating element and in a direction perpendicular, at least a portion of the inner wall is curved or bent,
The electricity storage device according to claim 2. The cross-sectional shape parallel to the one surface of the liquid injection path is enlarged as at least a part thereof approaches the back surface from the front surface.
The electrical storage element in any one of Claim 1 to 3. The cross-sectional shape parallel to the one surface of the liquid injection channel is gradually expanded as it approaches the back surface from the front surface.
The electricity storage device according to claim 4. The cross-sectional shape is anisotropically enlarged with respect to the one surface from the front surface toward the back surface,
The electrical storage element of Claim 4 or 5. At least a part of the position of the cross section parallel to the one surface of the liquid injection path is continuously moving from the front surface to the back surface.
The electrical storage element in any one of Claim 1 to 6. The position of the cross section of the liquid injection path parallel to the one surface is moving in stages as it approaches the back surface from the front surface.
The electrical storage element in any one of Claim 1 to 6. Direction of movement of the cross section, the distance between the surface of the power generating element and the one surface in a direction perpendicular to said one surface is match direction one larger,
The electricity storage device according to claim 7 or 8. The opening on the front surface and the opening on the back surface of the liquid injection channel are partially overlapped when viewed from a direction orthogonal to the opening on the surface.
The electrical storage element in any one of Claim 1 to 9. The liquid injection path goes straight a certain distance from the opening in the surface,
The electrical storage element in any one of Claim 1 to 10.

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