JP2015076293A - Nonaqueous electrolyte secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery which is arranged so that the leakage of electrolyte is prevented, and enables the increase in its productivity.SOLUTION: A nonaqueous electrolyte secondary battery according to an embodiment comprises: an outer container 12 having a lid 5; an electrode body 2 enclosed in the outer container together with a nonaqueous electrolyte; a pair of electrode terminals 6 and 7 provided on the lid in line, and each electrically connected to the electrode body; a liquid-pouring spout 17 provided on the lid for pouring the nonaqueous electrolyte into the outer container; a pressure relief valve 21 formed in the lid; and a frame-like insulative spacer 30 disposed between the electrode body and the lid in the outer container and having an electrolyte-circulating path and a gas release flow path.

Description

  Embodiments described herein relate generally to a non-aqueous electrolyte secondary battery.

  In recent years, chargeable / dischargeable rectangular parallelepiped non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries are mainly used as power sources for electric vehicles such as hybrid electric vehicles and plug-in electric vehicles that are rapidly spreading. Yes. A lithium ion secondary battery is a rectangular parallelepiped battery case made of aluminum or an aluminum alloy with an electrode body obtained by winding or laminating a positive electrode and a negative electrode with a separator interposed therebetween, and a non-aqueous electrolyte infiltrating the electrode body ( It is housed in an exterior container.

  The upper end opening of the battery case is closed by a lid. The lid is provided with a positive terminal, a negative terminal, a sealing plate, a gas discharge valve, and the like. There is a liquid injection port under the sealing plate. After the electrolytic solution is placed in the battery case, the sealing plate is welded to close the liquid injection port.

  Further, in the battery container, an insulating member formed of an insulating resin is provided around the lead for connecting the positive electrode terminal and the negative electrode terminal to the positive electrode and the negative electrode of the electrode body. It has the function of insulation from the container.

JP 2013-020735 A

  However, the insulating member is interposed between the electrolyte solution inlet and the electrode body, and closes the electrolyte inflow path or gas discharge path. Therefore, when the electrolytic solution is injected, the electrolytic solution accumulates in the middle portion of the insulating member, which becomes an obstacle to shortening the time for the electrolytic solution to reach the electrode body. Further, in the insulating member, the pressure inside the battery container becomes high, and it is necessary to secure a gas discharge path when the internal pressure is relieved by opening the gas release valve.

  The present invention has been made in view of the above points, and an object thereof is to provide a non-aqueous electrolyte battery having a structure in which an appropriate electrolyte inflow path and gas discharge path are secured.

  According to the embodiment, the non-aqueous electrolyte secondary battery is provided side by side with the outer container having a lid, the electrode body housed in the outer container together with the non-aqueous electrolyte, and the lid. A pair of electrode terminals electrically connected to the electrode body, a liquid injection port for injecting a non-aqueous electrolyte into the outer container, and a pressure release formed in the lid body A valve and a frame-shaped insulating spacer having an electrolyte solution passage and a gas discharge passage are disposed between the electrode body and the lid body in the outer container.

FIG. 1 is a perspective view showing an appearance of the secondary battery according to the first embodiment. FIG. 2 is an exploded perspective view of the secondary battery. FIG. 3 is an exploded view showing an electrode group of the nonaqueous electrolyte battery according to the embodiment. FIG. 4 is a cross-sectional view showing an upper part on the lid side of the secondary battery. FIG. 5 is a perspective view showing an insulating spacer according to a modification. FIG. 6 is an exploded perspective view showing the secondary battery according to the second embodiment.

Hereinafter, the nonaqueous electrolyte secondary battery according to the embodiment will be described in detail with reference to the drawings.
(First embodiment)
1 and 2 are a perspective view showing an external appearance of the non-electrolyte secondary battery according to the first embodiment, an exploded perspective view of the non-electrolyte secondary battery, and FIG. 3 is an exploded perspective view of the electrode body, FIG. These are sectional drawings which show the upper part by the side of the cover body of a secondary battery.

  As shown in FIGS. 1, 2, and 4, the secondary battery 10 is a non-aqueous electrolyte secondary battery such as a lithium ion battery, and includes a flat, substantially rectangular parallelepiped outer container 12, and an outer container 12. And an electrode body 2 housed together with a non-aqueous electrolyte. The outer container 12 is an outer can (battery case) formed from a metal such as aluminum, an aluminum alloy, iron, or stainless steel, for example.

  The outer container 12 includes a container body 1 having an open upper end and a rectangular plate-like lid body 5 that is welded to the container body and closes the opening of the container body, and the inside thereof is formed fluid-tight. The lid 5 of the outer container 12 is provided with a positive electrode terminal 6 and a negative electrode terminal 7, a pressure release valve 21, and a liquid injection port 17 as a pair of electrode terminals.

  As shown in FIG. 3, the electrode body 2 includes, for example, a sheet-like positive electrode plate 24 and a negative electrode plate 25 wound in a spiral shape with a separator 26 interposed therebetween, and the cross-sectional shape is It is formed in a flat rectangular shape by compressing in the radial direction so as to have the same rectangular shape as the cross-sectional shape. A separator 26 is disposed on the outermost layer (outermost periphery) of the electrode body 2. The positive electrode plate 24 includes, for example, a strip-shaped current collector 24a made of metal foil, a positive electrode active material layer 24b formed on at least one surface of the current collector, and a plurality of short sides from a plurality of long sides of the positive electrode current collector. A strip-like positive electrode current collecting tab 8 extending in the side direction. The negative electrode plate 25 also has the same shape as the positive electrode plate, and a strip-shaped negative electrode current collector 25a made of metal foil, a negative electrode active material layer 25b formed on at least one surface of the negative electrode current collector, and a current collector And a strip-shaped negative electrode current collecting tab 9 extending in a short side direction from a plurality of long sides.

  In such a positive electrode plate 24, separator 26 and negative electrode plate 25, the positive electrode current collecting tab 8 protrudes from the separator 26 in the winding axis direction of the electrode body 2, and the negative electrode current collecting tab 9 does not overlap in the same direction. Thus, the position is shifted so as to protrude from the separator 26. The electrode body 2 is configured by such winding, and the positive electrode current collecting tab 8 and the negative electrode current collecting tab 9 protrude from the one end surface in the axial direction of the electrode body 2 so as not to overlap each other. The electrode body 2 wound in a spiral shape (coil shape) is fixed by a winding tape (not shown). A nonaqueous electrolyte (not shown) such as a nonaqueous electrolyte is held by the electrode body 2.

The positive electrode active material 24b is not particularly limited, and various oxides such as lithium-containing cobalt oxide (for example, LiCoO ₂ ), manganese dioxide, lithium manganese composite oxide (for example, LiMn ₂ O ₄ , LiMnO). ₂ ), lithium-containing nickel oxide (eg, LiNiO ₂ ), lithium-containing nickel cobalt oxide (eg, LiNi _0.8 Co _0.2 O ₂ ), lithium-containing iron oxide, vanadium oxide containing lithium, Examples thereof include chalcogen compounds such as titanium disulfide and molybdenum disulfide.

  The negative electrode active material 25b is not particularly limited. For example, a graphite material or a carbonaceous material (for example, graphite, coke, carbon fiber, spherical carbon, pyrolytic gas phase carbonaceous material, resin fired body, etc.), chalcogen Compound (eg, titanium disulfide, molybdenum disulfide, niobium selenide, etc.), light metal (eg, aluminum, aluminum alloy, magnesium alloy, lithium, lithium alloy, etc.), lithium titanium oxide (eg, spinel type lithium titanate) And the like.

  The separator 26 is not particularly limited, and for example, a microporous film, a woven fabric, a non-woven fabric, or a laminate of the same material or different materials among these can be used. Examples of the material for forming the separator include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-butene copolymer, and cellulose.

The non-aqueous electrolyte is prepared by dissolving an electrolyte (for example, a lithium salt) in a non-aqueous solvent. Nonaqueous solvents include, for example, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), γ-butyrolactone (γ- BL), sulfolane, acetonitrile, 1,2-dimethoxyethane, 1,3-dimethoxypropane, dimethyl ether, tetrahydrofuran (THF), 2-methyltetrahydrofuran and the like. Nonaqueous solvents may be used alone or in combination of two or more. Examples of the electrolyte include lithium perchlorate (LiClO ₄ ), lithium hexafluorophosphate (LiPF ₆ ), lithium tetrafluoroborate (LiBF ₄ ), lithium hexafluoroarsenate (LiAsF ₆ ), and trifluoromethanesulfonic acid. A lithium salt such as lithium (LiCF ₃ SO ₃ ) can be given. The electrolyte may be used alone or in combination of two or more. The amount of electrolyte dissolved in the non-aqueous solvent is desirably 0.2 mol / L to 3 mol / L. If the electrolyte concentration is too low, sufficient ionic conductivity may not be obtained. On the other hand, if it is too high, it may not be completely dissolved in the electrolyte.

  Each of the positive and negative electrode current collecting tabs 8 and 9 may be formed by punching a current collector. The current collector and the current collection tab are formed from, for example, a metal foil. The thickness of the metal foil, that is, the thickness per current collecting tab is desirably 5 μm or more and 50 μm or less. By setting the thickness to 5 μm or more, it is possible to prevent the current collector and the current collection tab from being broken at the time of manufacture and to achieve high current collection efficiency. Moreover, dissolution of the current collecting tab when a large current flows can be avoided. Further, by setting the thickness to 50 μm or less, it is possible to increase the number of circumferences constituting the electrode body while suppressing an increase in the thickness of the electrode body. Preferably, the thickness of the metal foil is not less than 10 μm and not more than 20 μm. Although the material of metal foil can change with the kind of active material used for a positive electrode or a negative electrode, aluminum, aluminum alloy, copper, or a copper alloy can be used, for example.

  As shown in FIGS. 2 and 4, the plurality of positive electrode current collecting tabs 8 are collectively held by the positive electrode backup leads 14 bent in a U shape. The positive electrode backup lead 14 is also referred to as a positive electrode protection lead. Similarly, the negative electrode current collecting tab 9 is held together by the negative electrode backup lead 15 bent into a U shape.

  The electrical connection between the positive electrode backup lead 14 and the positive electrode current collector tab 8 and the electrical connection between the negative electrode backup lead 15 and the negative electrode current collector tab 9 are, for example, methods such as laser welding, ultrasonic bonding, and resistance welding. However, ultrasonic bonding is preferred. The positive and negative electrode backup leads 14 and 15 are preferably made of the same material as the positive and negative electrode current collecting tabs 8 and 9, respectively. Further, it is desirable that the thicknesses of the positive and negative electrode backup leads 14 and 15 be larger than three times the thickness of the positive and negative current collecting tabs 8 and 9.

  A positive electrode terminal 6 and a negative electrode terminal 7 are provided at both ends in the longitudinal direction of the lid body 5 and project outward from the lid body 5. Specifically, rectangular recesses 19 are respectively formed at both ends in the longitudinal direction of the lid 5, and a sealing material made of an insulating material such as synthetic resin or glass, for example, a gasket 13 is formed in each of these recesses 19. Each is attached. Through holes 20 and 23 are provided in the center of each recess 19 and gasket 13.

  The positive electrode terminal 6 integrally has a stepped rectangular terminal body 6a and a connecting rod 6b extending downward from the bottom surface of the terminal body 6a. The positive electrode terminal 6 is mounted on the gasket 13 with the connecting rod 6 b inserted through the gasket 13 and the through holes 23 and 20 of the recess 19. Similarly, the negative electrode terminal 7 integrally has a stepped rectangular terminal body 7a and a connecting rod 7b extending downward from the bottom surface of the terminal body 7a. The negative electrode terminal 7 is mounted on the gasket 13 in a state where the connecting rod 7 b is inserted through the gasket 13 and the through holes 23 and 20 of the recess 19.

  As shown in FIGS. 2 and 4, the positive electrode lead 3 and the positive electrode internal insulator 27 are arranged between the positive electrode backup lead 14 and the lid 5 in the outer container 12. The negative electrode lead 4 and the negative electrode internal insulator 28 are disposed between the negative electrode backup lead 15 and the lid 5.

  The positive electrode lead 3 is formed by bending a plate material at a right angle so as to have an L-shaped cross section. The positive electrode lead 3 is a current collector for electrically connecting a rectangular plate lid joint 3 a facing the lid body 5 and the positive electrode current collecting tab 8. The electric tab joint portion 3b is integrally provided. The current collecting tab joint 3 b is joined (welded) to the positive electrode backup lead 14 via a rectangular plate-like intermediate lead 16. The lid joint 3a is provided with a through hole 3e for joining the connecting rod 6b of the electrode terminal.

  The positive electrode internal insulator 27 is formed in a substantially rectangular plate shape and is larger in size than the lid bonding portion 3 a of the positive electrode lead 3. And the positive electrode internal insulator 27 is arrange | positioned in parallel with these between the cover body 5 and the cover junction part 3a, and electrically insulates between these. Further, a through hole 27a for inserting the connecting rod 6b is formed in the positive electrode internal insulator 27. The connecting rod 6 b of the positive electrode terminal 6 passes through the through hole 27 a of the positive electrode internal insulator 27 and is fitted and joined to the through hole 3 e of the positive electrode lead 3. As a result, the positive terminal 6 is electrically connected to the positive current collecting tab 8 via the positive lead 3, the intermediate lead 16, and the positive backup lead 14.

  The negative electrode lead 4 is formed by bending a plate material at a right angle to form an L-shaped cross section, and is a collector for electrically connecting the negative electrode current collecting tab 9 and a rectangular plate lid joint portion 4a facing the lid body 5 in parallel. The electric tab joint portion 4b is integrally provided. The current collecting tab joint 4 b is joined (welded) to the negative electrode backup lead 15 via a rectangular plate-like intermediate lead 18. The lid joint 4a is provided with a through hole 4e for joining the connecting rod 7b of the electrode terminal.

  The negative electrode internal insulator 28 is formed in a substantially rectangular plate shape and is larger in size than the lid bonding portion 4 a of the negative electrode lead 4. And the negative electrode internal insulator 28 is arrange | positioned in parallel with these between the cover body 5 and the cover junction part 4a, and insulates these electrically. The negative electrode inner insulator 28 is formed with a through hole 28a for inserting the connecting rod 7b. The connecting rod 7 b of the negative electrode terminal 7 passes through the through hole 28 a of the negative electrode internal insulator 28 and is fitted and joined to the through hole 4 e of the negative electrode lead 4. Thus, the negative electrode terminal 7 is electrically connected to the negative electrode current collecting tab 9 via the negative electrode lead 4, the intermediate lead 18, and the negative electrode backup lead 15.

  As shown in FIGS. 1, 2, and 4, the lid 5 of the outer container 12 is formed with a pressure release valve (safety valve) 21 that functions as a gas exhaust mechanism and a non-aqueous electrolyte injection port 17. Has been. The pressure release valve 21 is provided between the positive electrode terminal 6 and the negative electrode terminal 7 at the center in the longitudinal direction of the lid 5. The pressure release valve 21 is formed to have a plate thickness that is about half that of the lid 5. When gas is generated in the outer container 12 due to an abnormal mode or the like of the secondary battery 10 and the internal pressure in the outer container rises to a predetermined value or more, the pressure release valve 21 is opened, and the inner pressure is lowered to reduce the outer container 12 Prevent problems such as rupture.

  The nonaqueous electrolyte injection port 17 is located, for example, between the negative electrode terminal 7 and the pressure release valve 21. In addition, after injecting the non-aqueous electrolyte into the outer container 12 through the injection port 17, the injection port 17 is sealed with, for example, a disk-shaped sealing lid 22.

  As shown in FIGS. 2 and 4, the nonaqueous electrolyte secondary battery 10 includes an insulating spacer (insulating member) 30 provided between the electrode body 2 and the lid body 5 in the outer container 12. . The insulating spacer 30 formed of an insulating material integrally includes a rectangular frame-shaped spacer main body 32 and a plurality of partition walls 34 provided in the spacer main body and partitioning a space in the spacer main body into a plurality of flow paths. ing. The height of the spacer main body 32, that is, the length h in the axial direction of the frame body is formed to be substantially equal to the distance between the electrode body 2 and the inner surface of the lid body 5. The spacer body 32 is disposed between the pair of electrode terminals and between the pair of current collecting tabs 8 and 9. One end of the spacer body 32 in the axial direction is in contact with the end face of the electrode body 2, here, the end face on which the current collecting tabs 8 and 9 are provided, and the other end in the axial direction is in contact with the inner face of the lid body 5. . Thereby, the spacer main body 32 is pinched | interposed between the electrode body 2 and the cover body 5, and maintains these space | intervals constant.

  The partition wall 34 is formed in a tubular structure, for example, a honeycomb structure. The partition wall 34 and the spacer body 32 form a plurality of through holes 36 each having a polygonal cross section, for example, a hexagon. These through holes 36 extend in parallel with the axial direction of the electrode body 2 and function as an electrolyte flow path and a gas discharge path.

  The wall thickness of the partition wall 34 and the spacer main body 32 constituting the honeycomb structure is preferably 1.0 mm or more and 2.0 mm or less, and the pitch is 2.0 mm or more and 5.0 mm or less. One or more of the through holes 36 face the electrolyte solution injection port 17 or the pressure release valve 21 and face these directions, so that the flow direction of the electrolyte when the electrolyte is injected and the gas flow when releasing the gas. It matches the flow direction.

  According to the present embodiment, the insulating spacer 30 integrally includes a pair of rectangular outer frames 38 a and 38 b provided on both longitudinal sides of the spacer body 32. Thereby, the insulating spacer 30 is formed in an elongated rectangular frame shape having substantially the same length and width as the lid body 5 as a whole.

  The positive electrode current collecting tab 8, the positive electrode backup lead 14, the positive electrode lead 3, and the positive electrode internal insulator 27 are inserted into one outer frame 38a. Thereby, the outer frame 38 covers the periphery of the positive electrode current collecting tab 8, the positive electrode backup lead 14, the positive electrode lead 3, and the positive electrode internal insulator 27, and one end in the axial direction is on the upper end surface of the electrode body 2. The other end in the axial direction is in contact with the inner surface of the lid 5.

  The negative electrode current collecting tab 9, the negative electrode backup lead 15, the negative electrode lead 4, and the negative electrode internal insulator 28 are inserted through the other outer frame 38b. Thus, the outer frame 38 b covers the periphery of the negative electrode current collecting tab 9, the negative electrode backup lead 15, the negative electrode lead 4, and the negative electrode internal insulator 28, and one end in the axial direction is on the upper end surface of the electrode body 2. The other end in the axial direction is in contact with the inner surface of the lid 5.

  The insulating spacer 30 configured as described above is integrally formed of, for example, synthetic resin as an insulating material. As the resin used for the insulating spacer 30, any resin can be used as long as it is resistant to the electrolytic solution. For example, polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene vinyl acetate alcohol copolymer, Ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer, ethylene / methyl acrylate copolymer, ethylene methacryl acrylate copolymer, ethylene / methyl methacrylic acid copolymer, achionomer, polyacrylonitrile, polyvinylidene chloride, poly Tetrafluoroethylene, polychlorotrifluoroethylene, polyphenylene ether, polyethylene terephthalate, polytetrafluoroethylene, or the like can be used. One kind of the resin may be used alone, or a plurality of kinds may be mixed and used. Among these, it is preferable to use polypropylene or polyethylene.

  The insulating spacer 30 has a flexural modulus of 600 MPa to 1500 MPa, a specific heat of 0.25 cal / ° C. · g to 0.40 cal / ° C. g, and a thermal conductivity of 0.3 W / m · K. It is 0.6 W / m · K or less.

Further, the insulating spacer 30 may be formed of an insulating material containing an adsorbent that adsorbs at least one of moisture and generated gas in the electrolytic solution. As the adsorbent (inorganic material), adsorbent materials such as zeolite, activated alumina, silica gel, activated carbon and the like can be used alone or in combination. Among the adsorbing materials, it is preferable to use zeolite, and the zeolite can be selected according to the adsorbing species. As for the content rate of the adsorption material (inorganic substance) contained in the insulating spacer 30, 10 mass% or more and 60 mass% or less are preferable.
The manufacturing method of the insulating spacer 30 is not particularly limited, and examples thereof include resin molding such as cutting molding, injection molding, and extrusion molding.

(Example 1)
The positive electrode terminal 6 and the positive electrode current collecting tab 8 of the electrode body 2 were welded and electrically connected via the positive electrode backup lead 14 and the positive electrode lead 3. Similarly, the negative electrode terminal 7 and the negative electrode current collecting tab 9 of the electrode body 2 were welded and electrically connected via the negative electrode backup lead 15 and the negative electrode lead 4. The insulating spacer 30 was placed so as to cover the leads 14 and 15 and the tabs 8 and 9, and the electrode body 2 was inserted into the container body 1, and then the lid body 5 was welded to the container body by laser.

  The insulating spacer 30 was made of polyethylene as a resin, mixed with 4A zeolite at a ratio of 40% by mass, and molded by injection molding. The partition wall thickness of the honeycomb structure tube of the spacer body 32 was 1.0 mm, and the pitch was 2.0 mm.

  An electrolytic solution was poured from the liquid injection port 17 and the liquid injection port was closed with a sealing lid 22 to obtain a nonaqueous electrolyte secondary battery having a rated capacity of 3 Ah. The electrolyte used was a mixture of ethylene carbonate and dimethyl carbonate 1: 1 as a non-aqueous solvent, and 2 mol / l lithium hexafluorophosphate as an electrolyte.

(Example 2)
In Example 2, polypropylene was used as the resin for the insulating spacer 30, 4A zeolite was mixed so as to be 40% by mass, and molded by injection molding. The honeycomb structure in the center part had a partition wall thickness of 1.0 mm and a pitch of 3.0 mm.

(Example 3)
In Example 3, polypropylene was used as the resin for the insulating spacer, 4A zeolite was mixed so as to be 40% by mass, and molded by injection molding. The partition wall thickness of the honeycomb structure was 2.0 mm, and the pitch was 5.0 mm.

Example 4
In Example 4, polypropylene was used as the resin for the insulating spacer 30, and 4A type zeolite was adjusted to 0% by mass (resin only) and molded by injection molding.

  According to the non-aqueous electrolyte secondary battery 10 configured as described above, an insulating spacer is provided between the electrode body 2 and the lid body 5, and the distance between the electrode body and the lid body is maintained constant by this insulating spacer. In addition, deformation and movement of the lid and the magnetic pole body can be prevented. Further, the current collecting tab and the lead are surrounded by the insulating spacer to ensure the insulation between the current collecting tabs and the insulation between the outer casing. Furthermore, since the insulating spacer has an electrolyte flow path and a gas discharge flow path extending in the axial direction of the electrode body, injection of the electrolyte and release of the generated gas are not hindered. By using various adsorbents such as zeolite as the insulating material for forming the insulating spacer, it becomes possible to produce a battery having moisture adsorption performance in the electrolytic solution and gas adsorption performance generated when the battery is used.

  By using a honeycomb structure for the main body of the insulating spacer, a lightweight and strong structure can be obtained. Further, since the surface area of the through hole is large, it is advantageous when performing gas adsorption by adsorbent mixing into the resin. Furthermore, since a gas / liquid flow path is secured by the through holes of the honeycomb structure, it is advantageous in electrolyte injection and gas discharge.

  In the tubular structure (honeycomb structure) of the main body of the insulating spacer, the cross-sectional shape of the through hole is not limited to a hexagon, and various shapes such as a quadrangle, a circle, an ellipse, and a rhombus can be selected. Further, the partition walls 34 that form the through holes are not limited to the honeycomb shape, and may be formed in a lattice shape as shown in FIG.

(Second Embodiment)
Next, the nonaqueous electrolyte secondary battery according to the second embodiment will be described. FIG. 6 is an exploded perspective view showing the nonaqueous electrolyte secondary battery 10 according to the second embodiment. Note that in the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts are mainly described.

  As shown in FIG. 6, according to the second embodiment, the insulating spacer 30 divides a rectangular frame-shaped spacer main body 32 from a space in the main body, and a plurality of partition walls 34 that form a plurality of through holes 36. And a pair of outer frames are omitted. The insulating spacer 30 is disposed between the electrode body 2 and the lid body 5 in the outer container 12, and is further disposed between the positive electrode current collecting tab 8 and the negative electrode current collecting tab 9 of the electrode body 2. Has been placed.

  Even when the insulating spacer 30 configured as described above is used, the same effects as those of the first embodiment can be obtained. That is, a nonaqueous electrolyte battery having a structure in which appropriate electrolyte flow passages and gas discharge passages are secured can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Container main body, 5 ... Lid body, 6 ... Positive electrode terminal, 7 ... Negative electrode terminal, 8 ... Positive electrode current collection tab,
9 ... Negative electrode current collecting tab, 10 ... Non-aqueous electrolyte secondary battery, 12 ... Exterior container, 13 ... Gasket,
17 ... Liquid injection port, 21 ... Pressure release valve, 30 ... Insulating spacer, 32 ... Spacer body,
34 ... partition wall, 36 ... through hole (electrolyte flow passage, gas discharge passage)

Claims (6)

An exterior container having a lid,
An electrode body housed in the outer container together with a non-aqueous electrolyte,
A pair of electrode terminals provided on the lid, each electrically connected to the electrode body;
A liquid injection port for injecting a non-aqueous electrolyte into the outer container provided in the lid;
A pressure release valve formed on the lid;
A frame-shaped insulating spacer that is disposed between the electrode body and the lid body in the outer container, and has an electrolyte flow passage and a gas discharge passage;
A non-aqueous electrolyte secondary battery.   The insulating spacer includes a frame-shaped spacer body having one end that contacts the electrode body and the other end that contacts the lid body, and the electrolyte flow passage and the gas discharge passage provided in the spacer body. The nonaqueous electrolyte secondary battery according to claim 1, further comprising a plurality of partition walls to be defined.   The non-aqueous electrolyte secondary battery according to claim 2, wherein the plurality of partition walls are formed in a honeycomb shape.   The non-aqueous electrolyte secondary battery according to claim 2, wherein the plurality of partition walls are formed in a lattice shape. The electrode body has a positive side tab and a negative side tab that protrude toward the lid,
The pair of electrode terminals are connected to the positive-side tab and the negative-side tab via leads, respectively.
5. The nonaqueous electrolyte secondary battery according to claim 1, wherein the insulating spacer integrally includes a pair of outer frames through which the lead and the positive electrode side tab or the negative electrode side tab are inserted. .   The non-aqueous electrolyte secondary battery according to claim 1, wherein the insulating spacer is formed of an insulating material containing an adsorbent that adsorbs at least one of moisture and generated gas in the electrolytic solution. .