JP6943832B2 - Fixtures and battery modules - Google Patents

Description

The present invention relates to fixtures and storage battery modules.

When manufacturing an assembled battery (storage battery module), after stacking a plurality of battery cells (storage battery cells), the positive electrode terminal (positive electrode tab) and the negative electrode terminal (negative electrode tab) are electrically connected by, for example, laser welding. (See, for example, Patent Document 1).
However, if the positive electrode terminal and the negative electrode terminal are connected by laser welding, even if an abnormality occurs in the battery cell, only the battery cell in which the abnormality has occurred cannot be replaced, and the entire assembled battery is discarded. There is something you have to do.

Japanese Unexamined Patent Publication No. 2003-338275

An object of the present invention is a simple structure in which terminal tabs of adjacent storage battery cells can be electrically connected to each other, and the terminal tabs can be detached as needed, and the fixtures are laminated. An object of the present invention is to provide a storage battery module in which an electrode tab of a storage battery cell is fixed.

Such an object is achieved by the inventions (1) to ( 7) below.
(1) The electrodes having a width smaller than that of the storage battery cell and which are detachably fixed to each of the electrode tabs partially provided in the center of the width direction at both ends in the longitudinal direction of the plurality of stacked storage battery cells. A fixture that is wider than a tab
It is a pressure welding portion that has elasticity and electrically connects these electrode tabs to each other by pressing the inserted at least two electrode tabs to each other, and a plurality of the electrode tabs are provided along the stacking direction of the storage battery cells. With the pressure welding part that is
It has a guide portion that communicates with each of the pressure contact portions and guides the electrode tab to the pressure contact portion.
The pressure contact portion and the guide portion are integrally formed together with a frame-shaped base portion.
Each said guide portion comprises respectively a pair of guide surfaces facing in the hotel direction of the pressure-contacting portion,
The separation distance between the pair of guide surfaces increases as the distance from the pressure contact portion increases.
When fixing the two electrode tabs with the fixture, the two electrode tabs are inserted into the guide portion, and the two electrode tabs are forcibly inserted between the pair of guide surfaces. Fixing characterized in that when the two electrode tabs are inserted into the pressure contact portion by guiding the two electrode tabs toward the pressure contact portion while being brought close to each other, the two electrode tabs are pressure-welded at the pressure contact portion. Ingredients.

(2) The fixture according to (1) above, wherein the fixture is for collectively fixing the electrode tabs of the plurality of storage battery cells.

( 3 ) The fixture according to (1) or (2) above, wherein the guide surface is subjected to a treatment for improving slidability with respect to the electrode tab.

( 4 ) The fixture according to any one of (1) to (3) above, wherein at least the surface in contact with the electrode tab is made of an insulating material.

( 5 ) The fixture according to any one of (1) to (4) above, wherein at least the surface in contact with the electrode tab is subjected to a treatment for improving the slidability with respect to the electrode tab.

( 6 ) The fixture according to any one of (1) to (5 ) above, which is further exposed to the pressure contact portion and has a terminal used for monitoring the voltage of each storage battery cell.

( 7 ) A cell laminate containing a plurality of stacked storage battery cells and
A battery container accommodating the cell laminate and
The fixture according to any one of claims 1 to 6 attached to the cell laminate.
The fixture fixes the electrode tabs of the plurality of storage battery cells .
The movement of the cell laminate in the battery container is restricted by the contact of the fixture with the battery container while the cell laminate with the fixture is housed in the battery container. A storage battery module characterized by this.

According to the present invention, the electrode tab can be fixed by a simple operation, so that the workability is excellent, and the storage battery cell can be reused by detachably configuring the electrode tab.

It is a partial cross-sectional plan view (a) and a partial cross-sectional side view (b) which show the structure of a storage battery module. It is a perspective view of the storage battery cell included in the storage battery module shown in FIG. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a side view which shows the structure of the fixture. FIG. 4 is a cross-sectional perspective view taken along the line BB in FIG. It is sectional drawing which shows the other structural example of a fixture.

Hereinafter, the fixture and the storage battery module of the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings. In the following embodiment, a case where the lithium ion secondary battery is applied to the storage battery cell will be described.
1 is a partial cross-sectional plan view (a) and a partial cross-sectional side view (b) showing the configuration of the storage battery module, FIG. 2 is a perspective view of the storage battery cell included in the storage battery module shown in FIG. 1, and FIG. 3 is FIG. A cross-sectional view taken along the line AA, FIG. 4 is a side view showing the configuration of the fixture, and FIG. 5 is a perspective view taken along the line BB in FIG.

In each figure, in order to make the feature easy to understand, the featured portion may be enlarged for convenience, and the dimensional ratio and the like of each component may be different from the actual ones.
The materials, dimensions, etc. exemplified below are examples, and the present invention is not limited thereto, and the present invention can be appropriately modified without changing the gist thereof.

As shown in FIG. 1, the storage battery module 100 includes a cell laminate 110 including a plurality of stacked storage battery cells (lithium ion secondary batteries) 1, a fixture 9 mounted on the cell laminate 110, and a fixture. A battery container 200 for accommodating the cell laminate 110 to which the 9 is mounted is provided.
The battery container 200 has a plate 210 and a cover 220 attached to the plate 210. With the cover 220 attached to the plate 210, an internal space 230 is formed in the battery container 200, and the cell laminate 110 to which the fixture 9 is attached is housed in the internal space 230.

Examples of the constituent material of the battery container 200 include a hard resin material such as polycarbonate and a metal material such as stainless steel.
As shown in FIG. 2, the storage battery cell 1 has a sheet-shaped cell body 11. As shown in FIG. 3, the cell body 11 includes an electrode laminate 10 including a positive electrode 2, a negative electrode 3, and a separator 6 interposed between the positive electrode 2, an electrolytic solution 7, and an electrode laminate 10 inside. And a sheet-shaped exterior body 8 for enclosing the electrolytic solution 7.

The electrode laminate 10 further includes a positive electrode tab 4 bonded (electrically connected) to the positive electrode 2 and a negative electrode tab 5 bonded (electrically connected) to the negative electrode 3. These tabs 4 Reference numeral 5 denotes a state in which the electrode laminate 10 is enclosed in the exterior body 8 and protrudes (exposed to the outside) from the cell body 11 (exterior body 8).
In the present embodiment, the positive electrode tab 4 bonded to the positive electrode 2 and the negative electrode tab 5 bonded to the negative electrode 3 project to the opposite sides of the cell body 11 in the longitudinal direction.

Although not shown, the positive electrode 2 has a positive electrode current collector made of aluminum foil having a substantially rectangular shape in a plan view, and positive electrode active material layers provided on both sides of the positive electrode current collector. When the storage battery cell 1 is charged, the positive electrode current collector collects electricity and supplies it to the positive electrode active material layer.
A part of the positive electrode current collector is exposed from the positive electrode active material layer, and the positive electrode tab 4 is bonded to this exposed portion. The positive electrode tab 4 is not particularly limited as long as it has conductivity, and can be made of, for example, an aluminum plate, a copper plate, a nickel plate, or the like. The positive electrode tab 4 may be formed integrally with the positive electrode current collector.

The positive electrode active material layer can be formed, for example, by applying a positive electrode slurry containing a positive electrode active material, a conductive auxiliary agent, and a binder to a positive electrode current collector.
The positive electrode active material is not particularly limited, but for example, the general formula "LiM _x O _y (in the formula, M is a metal atom, and x and y are composition ratios of the metal atom M and the oxygen atom O." ) ”, And one of them can be used alone or in combination of two or more.

Specific examples of such a lithium metal acid compound include lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), lithium manganate (LiMn ₂ O ₄ ), and the like.
In the above general formula, M may be composed of a plurality of types of metal atoms. In this case, the lithium metal oxide compound, for example, the general formula ^"LiM in ^{_{1 p M 2 q M 3 r}} O y ( ^wherein, M 1, ^{M 2} and ^{M 3} are a different type of metal atom, p, q , R and y are ^{composition ratios of the metal atoms M 1} , M ² and M ³ and the oxygen atom O.) ”. p + q + r = x. Specific examples of such a lithium metallic acid compound include LiNi _0.33 Mn _0.33 Co _0.33 O _{2 and the} like.

As the positive electrode active material, olivine-type lithium iron phosphate (LiFePO ₄ ) having a similar composition can also be used.
As the conductive auxiliary agent, for example, acetylene black or the like is used, and as the binder, for example, polyvinylidene fluoride, carboxymethyl cellulose, an acrylic resin or the like is used.

Although not shown, the negative electrode 3 has a negative electrode current collector made of copper foil having a substantially rectangular shape in a plan view, and negative electrode active material layers provided on both sides of the negative electrode current collector. When the storage battery cell 1 is discharged, the negative electrode current collector efficiently takes out the electrons generated in the negative electrode active material layer and supplies them to an external device.
A part of the negative electrode current collector is exposed from the negative electrode active material layer, and the negative electrode tab 5 is bonded to this exposed portion. The negative electrode tab 5 is not particularly limited as long as it has conductivity, and can be made of, for example, a copper plate, a nickel plate, an aluminum plate, a nickel-plated aluminum plate, or the like. The negative electrode tab 5 may be formed integrally with the negative electrode current collector.

The negative electrode active material layer can be formed, for example, by applying a negative electrode slurry containing a negative electrode active material, a binder, and, if necessary, a conductive auxiliary agent, to the negative electrode current collector.
The negative electrode active material is not particularly limited, and for example, a carbon material such as carbon powder or graphite powder, a metal oxide such as lithium titanate, or the like can be used.
As the binder, for example, polyvinylidene fluoride or the like can be used, and as the conductive auxiliary agent, for example, acetylene black, carbon nanotubes or the like can be used.

The planar shape of each current collector has a rectangular shape in the illustrated configuration, but may be, for example, a square shape, a circular shape, an elliptical shape, or the like.
The area (flat area) of each current collector in a plan view is appropriately set according to the size of the storage battery cell 1 to be manufactured, and is not particularly limited, but is preferably about ^{500 to 2500 mm 2, preferably about 750.} More preferably, it is about 2000 mm ^2.
The thickness of each current collector is also not particularly limited, but is preferably about 1 to 75 μm, and more preferably about 5 to 50 μm.

Each electrode active material is preferably in the form of particles. In this case, the average particle size of the electrode active material is preferably about 1 to 30 μm.
The thickness of each active material layer is also not particularly limited, but is preferably about 5 to 100 μm, and more preferably about 10 to 75 μm.

A separator 6 is interposed between the positive electrode 2 and the negative electrode 3. The separator 6 has an insulating property, has a function of preventing a short circuit between the positive electrode 2 and the negative electrode 3, and has a function of holding the electrolytic solution 7. The electrolyte layer is formed by holding the electrolytic solution 7 in the separator 6.
The separator 6 is not particularly limited as long as it can hold or pass the electrolytic solution 7, and may be composed of a porous film or a non-porous film.
Examples of the porous film include a sheet material having pores, a non-woven fabric, and the like. The sheet material having pores can be formed from, for example, a material containing particles and a binder. The non-porous membrane can be formed of a resin material capable of holding the electrolytic solution. The non-porous film may contain particulate matter having a spacer function.

Examples of the constituent material (insulating material) of the separator 6 include olefin resins such as polyethylene and polypropylene, cellulosic resins, and glass fibers.
Examples of the resin resin capable of holding the electrolytic solution include polymers such as polyvinylidene fluoride-based resin, polyacrylonitrile-based resin, and polyethylene oxide-based resin. Of these, vinylidene fluoride-hexafluoropropylene copolymer is particularly preferable.
The thickness of the separator 6 is preferably about 1 to 75 μm, more preferably about 1 to 50 μm. With the separator 6 having such a thickness, sufficient insulating properties can be ensured.

The electrode laminate 10 as described above is enclosed in the exterior body 8 together with the electrolytic solution 7.
The electrolytic solution 7 is a liquid obtained by dissolving an electrolyte in a solvent. When the storage battery cell 1 is charged and discharged, ions are conducted in the electrolytic solution 7.

As the solvent, a non-aqueous solvent containing substantially no water (for example, less than 100 ppm) is preferably used. Examples of the non-aqueous solvent include propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, dimethoxyethane, γ-butyrolactone, methyl acetate, methyl formate, toluene, hexane and the like, and one of them. The seeds can be used alone or in combination of two or more.

As the electrolyte, for example, lithium salts such as lithium hexafluorophosphate, lithium perchlorate, and lithium tetrafluoroborate can be preferably used.
The concentration of the electrolyte in the electrolytic solution 7 is not particularly limited, but is preferably about 0.01 to 1 M, more preferably about 0.05 to 0.75 M, and more preferably about 0.1 to 0.5 M. Is more preferable.

The electrolytic solution 7 may be in the form of a gel by adding a gelling agent. Examples of the gelling agent may be any material that can retain an electrolyte, and examples thereof include polymer compounds. Examples of the polymer compound include a nitrile compound such as acetonitrile, an ether compound such as tetrahydrofuran, and an amide compound such as dimethylformamide, and one of these compounds may be used alone or in combination of two or more thereof. Can be used.

As shown in FIG. 3, the exterior body 8 is made by stacking two flexible sheet materials 80 and fusing the outer peripheral portions thereof (for example, heat fusing, ultrasonic fusing, high frequency fusing). It is sealed by this. Therefore, a seal portion S is formed on the outer peripheral portion of the exterior body 8.
The width of the seal portion S is not particularly limited, but is preferably about 0.3 to 45 mm, and more preferably about 0.5 to 30 mm.
As shown in FIG. 3, the sheet material 80 of the present embodiment has a base material layer 81, a resin layer 82 provided on one surface of the base material layer 81, and the other surface (resin layer) of the base material layer 81. It is composed of a laminated sheet provided with a protective layer 83 provided on a surface opposite to the 82).

The base material layer 81 has a function of imparting strength to the sheet material 80 and a function of blocking the permeation of the electrolytic solution 7 and gas. Examples of the constituent material of the base material layer 81 include aluminum or an aluminum alloy, stainless steel, and the like.
The thickness of the base material layer 81 is not particularly limited, but is preferably about 9 to 100 μm, and more preferably about 20 to 80 μm.

The resin layer 82 has a function of sealing the exterior body 8 by being fused. Examples of the constituent material (fusible material) of the resin layer 82 include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polyvinylidene chloride, and polyvinyl alcohol. Examples thereof include ethylene-vinyl alcohol copolymer, polystyrene, polyacrylonitrile, ethylene- (meth) acrylic acid copolymer, polymethylpentene, etc., and one of them may be used alone or in combination of two or more. Can be done.

The resin layer 82 is preferably made of a non-stretched film (particularly, a non-stretched polypropylene film) formed of the above material. Thereby, it is possible to preferably prevent the resin layer 82 from being dissolved or swollen by the electrolytic solution 7.
The thickness of the resin layer 82 is not particularly limited, but is preferably about 3 to 200 μm, and more preferably about 20 to 100 μm.

The protective layer 83 constitutes the outermost layer of the exterior body 8 and has a function of protecting the base material layer 81 and a function of ensuring the mechanical structural characteristics of the storage battery cell 1. A relatively hard resin material is used as the constituent material of the protective layer 83. Examples of such a hard resin material include polyamide (nylon), acrylic resin, polycarbonate, polyethylene terephthalate, and the like, and one of these can be used alone or in combination of two or more.
The thickness of the protective layer 83 is not particularly limited, but is preferably about 5 to 50 μm, and more preferably about 10 to 30 μm.

The fixture 9 has a plurality of pressure welding portions 91 arranged along the height direction (stacking direction of the storage battery cells 1), and a guide portion 92 communicating with each pressure welding portion 91. In the present embodiment, the pressure contact portion 91 and the guide portion 92 are integrally formed (with one member) with the frame-shaped base portion 93.
The guide portion 92 includes a pair of guide surfaces 92a and 92b facing each other in the side-by-side direction of the pressure contact portion 91, and the separation distance between the guide surfaces 92a and 92b increases as the distance from the pressure contact portion 91 increases. In the present embodiment, one positive electrode tab 4 and one negative electrode tab 5 are configured to be inserted into one guide portion 92. The inserted positive electrode tab 4 and negative electrode tab 5 are in sliding contact with the guide surfaces 92a and 92b, and are guided toward the pressure contact portion 91 while approaching each other.

After that, the positive electrode tab 4 and the negative electrode tab 5 are inserted into the pressure contact portion 91 and are electrically connected to each other by being pressure contacted at the pressure contact portion 91.
According to such a configuration, it is possible to obtain a good electrical connection between the positive electrode tab 4 and the negative electrode tab 5 with a simple configuration. Further, since the positive electrode tab 4 and the negative electrode tab 5 are only pressure-welded by the pressure-welding portion 91, they can be attached to and detached from the fixture 9. Therefore, if an abnormality occurs in the storage battery cell 1, the remaining normal storage battery cell 1 can be reused by replacing the abnormal storage battery cell 1 with a new storage battery cell 1.
In particular, since the guide surfaces 92a and 92b are inclined so that the separation distance becomes large on the insertion side of the positive electrode tab 4 and the negative electrode tab 5, the positive electrode tab 4 and the negative electrode tab 5 are smoothly directed toward the pressure contact portion 91. I can guide you.

It is preferable that the pressure contact portion 91 and the guide portion 92 (at least the surface of the fixture 9 in contact with the positive electrode tab 4 and the negative electrode tab 5) are made of an insulating material. This makes it possible to prevent electrical connection between the positive electrode tab 4 and the negative electrode tab 5, which should not be conductive.
In particular, the pressure contact portion 91 preferably has elasticity. As a result, the pressing force of the pressure contact portion 91 on the positive electrode tab 4 and the negative electrode tab 5 is further increased, and more reliable electrical connection between the positive electrode tab 4 and the negative electrode tab 5 is possible.
Examples of the elastic insulating material include fluorine-based thermoplastic elastomers, silicon-based thermoplastic elastomers, urethane-based thermoplastic elastomers, and the like, and one or a combination of two or more of these can be used.

Only the pressure contact portion 91 and the guide portion 92 may be made of such a material and fixed to the separately prepared base portion 93. In this case, the constituent materials of the pressure contact portion 91, the guide portion 92, and the base portion 93 may be different from each other.
Further, the guide surfaces 92a and 92b may be subjected to a treatment for improving the slidability with respect to the positive electrode tab 4 and the negative electrode tab 5. As a result, the positive electrode tab 4 and the negative electrode tab 5 can be smoothly guided to the pressure contact portion 91 along the guide surfaces 92a and 92b. Examples of such treatment include roughening treatment, formation of a film with a fluororesin, and the like.

When the fixture 9 as described above is brought close to the cell laminate 110 from both sides, the positive electrode tab 4 and the negative electrode tab 5 are inserted into the guide portion 92. Further, when the fixture 9 is brought closer to the cell laminate 110, the positive electrode tab 4 and the negative electrode tab 5 are guided by the guide portion 92 and inserted into the pressure contact portion 91. The positive electrode tab 4 and the negative electrode tab 5 inserted into the pressure contact portion 91 are pressure contacted and electrically connected. In this state, the fixtures 9 are attached to both sides of the cell laminate 110 in the longitudinal direction.
According to such a configuration, the plurality of positive electrode tabs 4 and the plurality of negative electrode tabs 5 can be fixed together. Further, the operation of attaching the cell laminate 110 of the fixture 9 is extremely simple.

As shown in FIG. 1, the total length (length in the longitudinal direction) L1 of the cell laminate 110 to which the fixture 9 is mounted is set to be substantially equal to the length L2 in the longitudinal direction of the internal space 230. As a result, the cell laminate 110 can be positioned with respect to the battery container 200. According to such a configuration, even when an unnecessary external force acts on the storage battery module 100, it is possible to prevent the cell laminate 110 from moving in the battery container 200 and preferably prevent damage to the storage battery cell 1. ..
Further, the width W1 of the fixture 9 (base 93) is set to be larger than the width W2 of the negative electrode tab 5 (positive electrode tab 4). As a result, it is possible to prevent the negative electrode tab 5 (positive electrode tab 4) from coming into contact with an unnecessary member and being deformed or damaged.

As shown in FIG. 6, the fixture 9 may be provided with a terminal 94 so as to be exposed to the pressure contact portion 91. A monitoring unit for monitoring the voltage of each storage battery cell 1 is electrically connected to the terminal 94. As a result, it is possible to monitor the change in the voltage of each storage battery cell 1 with a simple configuration. Therefore, the abnormality generated in each storage battery cell 1 can be detected at an initial stage, and the safety is high.

In the storage battery module 100 described above, the plurality of storage battery cells 1 are connected in series, but may be connected in parallel. In this case, a plurality of positive electrode tabs 4 or a plurality of negative electrode tabs 5 are inserted into one pressure welding portion 91.
Further, one pressure contact portion 91 may be configured to insert three or more electrode tabs.

Although the fixture and the storage battery module of the present invention have been described above, the present invention is not limited thereto. The fixture and storage battery module of the present invention may have any other configuration or may be replaced with any configuration that exhibits similar functions.
The storage battery cell may be composed of a secondary battery such as a silver ion secondary battery in addition to the lithium ion secondary battery.
Further, the exterior body 8 may be manufactured by bending one sheet material 80 and sealing the outer peripheral portion thereof.

Further, for example, the pressure contact portion 91 and the guide portion 92 may be configured as one holding member. In this case, it is preferable that a pair of holding members in the vertical direction in FIG. 4 can be slid into the recess of the base portion 93 so that they can be inserted. According to this configuration, the positive electrode tab 4 and the negative electrode tab 5 to be connected are sandwiched between a pair of sandwiching members, and if they are inserted (press-fitted) into the recess of the base 93 in this state, the positive electrode is inserted through the sandwiching member. The tab 4 and the negative electrode tab 5 are pressed so that they can be reliably electrically connected.
Such an operation may be performed for each set of the positive electrode tab 4 and the negative electrode tab 5 to be connected, or a plurality of sets may be performed at the same time (collectively). In the former case, if the operation is performed while confirming the states of the positive electrode tab 4 and the negative electrode tab 5, the effect of preventing bending of the positive electrode tab 4 and the negative electrode tab 5 is enhanced.
In the case of this configuration example, the guide portion 92 may be omitted, and the holding member may be formed only by the pressure contact portion 91. Further, the pair of holding members may be configured so that one end portions thereof can be connected to open and close the other end portion side.

100 Storage battery module 110 Cell laminate 200 Battery container 210 Plate 220 Cover 230 Internal space 1 Storage battery cell 11 Cell body 10 Electrode laminate 2 Positive electrode 3 Negative electrode 4 Positive electrode tab 5 Negative electrode tab 6 Separator 7 Electrolyte 8 Exterior body 80 Sheet material 81 Material layer 82 Resin layer 83 Protective layer 9 Fixture 91 Pressure welding part 92 Guide part 92a Upper surface 92b Lower surface 93 Base part 94 Terminal S Seal part

Claims (7)

Each electrode tab partially provided in the center of the width direction of both ends in the longitudinal direction of the plurality of stacked storage battery cells is detachably fixed , and the width is smaller than that of the storage battery cell and smaller than that of the electrode tab. It ’s a wide fixture,
It is a pressure welding portion that has elasticity and electrically connects these electrode tabs to each other by pressing the inserted at least two electrode tabs to each other, and a plurality of the electrode tabs are provided along the stacking direction of the storage battery cells. With the pressure welding part that is
It has a guide portion that communicates with each of the pressure contact portions and guides the electrode tab to the pressure contact portion.
The pressure contact portion and the guide portion are integrally formed together with a frame-shaped base portion.
Each said guide portion comprises respectively a pair of guide surfaces facing in the hotel direction of the pressure-contacting portion,
The separation distance between the pair of guide surfaces increases as the distance from the pressure contact portion increases.
When fixing the two electrode tabs with the fixture, the two electrode tabs are inserted into the guide portion, and the two electrode tabs are forcibly inserted between the pair of guide surfaces. Fixing characterized in that when the two electrode tabs are inserted into the pressure contact portion by guiding the two electrode tabs toward the pressure contact portion while being brought close to each other, the two electrode tabs are pressure-welded at the pressure contact portion. Ingredients. The fixture according to claim 1, wherein the fixture is for collectively fixing the electrode tabs of the plurality of storage battery cells. The fixture according to claim 1 or 2 , wherein the guide surface is subjected to a treatment for improving slidability with respect to the electrode tab. The fixture according to any one of claims 1 to 3 , wherein at least the surface in contact with the electrode tab is made of an insulating material. The fixture according to any one of claims 1 to 4 , wherein at least a surface in contact with the electrode tab is subjected to a treatment for improving slidability with respect to the electrode tab. The fixture according to any one of claims 1 to 5, further comprising a terminal exposed to the pressure welding portion and used to monitor the voltage of each storage battery cell. A cell laminate containing a plurality of stacked storage battery cells and
A battery container accommodating the cell laminate and
The fixture according to any one of claims 1 to 6 attached to the cell laminate.
The fixture fixes the electrode tabs of the plurality of storage battery cells .
The movement of the cell laminate in the battery container is restricted by the contact of the fixture with the battery container while the cell laminate with the fixture is housed in the battery container. A storage battery module characterized by this.

Images