JP6652813B2 - Stacked battery module - Google Patents

Description

  The present invention relates to a stacked battery module formed by stacking battery cells.

  2. Description of the Related Art Lithium ion (secondary) batteries have been widely used in various applications in recent years as small, lightweight secondary batteries with high capacity. In a general lithium ion battery, a positive electrode active material and a negative electrode active material are provided on one surface of a substantially flat current collector constituting a positive electrode and a negative electrode, and then heat treatment is performed to dry the positive electrode active material and the negative electrode active material. Then, if necessary, the positive electrode active material and the negative electrode active material are laminated with a separator between the positive electrode active material and the negative electrode active material to produce a lithium secondary battery, which is a substantially flat battery cell. A plurality of the unit cells are stacked to form a stacked battery module, and the stacked battery module is housed in a container forming an outer shell of the battery to form a lithium ion battery.

  When an abnormality such as an internal short-circuit occurs in such a lithium-ion battery formed by stacking a plurality of unit cells, a large current may flow in the short-circuited portion and the entire lithium-ion battery may generate heat. In order to suppress heat generation of the lithium ion battery in the event of an abnormality such as an internal short circuit, the current collector is composed of an insulating sheet and a conductive layer formed on the surface thereof, and a part of the conductive layer is formed to have a narrow width. Then, there is disclosed a technique in which the narrow portion is blown when a current exceeding a certain value flows (see Patent Document 1).

JP 2004-253356 A JP 2010-62081 A

  However, in the above-described conventional technique, a part of the conductive layer provided on the current collector is formed to have a small width, and the electrode terminal is connected to an end of the conductive layer. There is a possibility that the electric resistance between the electrode terminal connected to the current collector and the current collector increases.

  In particular, in recent lithium-ion batteries, a lithium-ion battery in which a plurality of unit cells are stacked and a resin current collector is used as a current collector has been proposed (see Patent Document 2). When a resin current collector is used, the resin current collector has a lower electron fluidity than a metal current collector and thus has a lower conductivity, thereby increasing the current collection efficiency from the resin current collector to the electrode terminals. There was a need.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stacked battery module that can maintain current collection efficiency during normal use while suppressing heat generation of a lithium ion battery. And one of them.

According to the present invention, a flat battery cell having a first-pole resin current collector serving as a first surface and a second-pole resin current collector serving as a second surface is connected to a first surface of a pair of adjacent battery cells. And a stacked battery module that is stacked such that the second surfaces are adjacent to each other. The stacked type battery module has a conductive portion on its upper and lower surfaces, includes a fusing unit for fusing at least one of the conductive portion provided on the upper and lower surfaces flow constant current above, the fusing part, the conductive The body is formed in a band shape, and is composed of a plurality of band-shaped conductive portions extending in one direction of the stacked battery module, and the band-shaped conductive portion has one end, which is an end in one direction, each one end of the stacked battery module. reaches up to the side surface side, the conductive portion on the side surface of the stacked battery module, aggregate the end of the strip-shaped conductive portion, by providing about parts collector that is electrically connected in common to the strip conductor section, above You have solved at least one of the issues.

Here, a portion of the plurality of strip-shaped conductive portions reaching the side surface on one end side of the stacked battery module is divided into two or more groups, and the plurality of strip-shaped conductive portions are commonly connected to each other in each group. a connecting portion, the aggregation section, a single integrated section der Rukoto connecting the connecting portions that each group has preferably.

  In addition, the battery cell includes a positive electrode in which a positive electrode composition layer containing a positive electrode active material and an electrolytic solution is formed on the surface of a positive resin current collector, and a negative electrode active material and an electrolytic solution which are formed on the surface of a negative resin current collector. And a negative electrode on which a negative electrode composition layer including a liquid is formed, and a negative electrode is laminated via a separator, and at least one of the positive electrode active material and the negative electrode active material mainly includes a conductive additive and a polymer. It is preferable to include at least one of the positive electrode active material and the negative electrode active material covered with the layer.

  According to the present invention, it is possible to provide a stacked battery module that can maintain current collection efficiency during normal use while suppressing heat generation of a lithium ion battery.

1 is a cross-sectional view illustrating a lithium-ion battery to which a stacked battery module according to a first embodiment of the present invention is applied. FIG. 2 is a perspective view illustrating the stacked battery module according to the first embodiment. It is a perspective view showing the lamination type battery module which is a 2nd embodiment of the present invention.

(1st Embodiment)
1 and 2, a description will be given of a stacked battery module according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view illustrating a lithium-ion battery to which a stacked battery module according to a first embodiment of the present invention is applied, and FIG. 2 is a perspective view illustrating the stacked battery module according to the first embodiment.

  In these figures, a lithium ion battery L to which the stacked battery module of the present embodiment is applied has a lithium secondary cell 1 having a substantially flat outer shape in series in a hollow container 20 forming an outer shell of the lithium ion battery L. A plurality of stacked battery modules 21 are housed.

  Here, in the present invention, the lithium secondary cell 1 is a positive electrode in which a positive electrode composition layer containing a positive electrode active material and an electrolytic solution is formed on the surface of a positive electrode current collector, a negative electrode active material and an electrolytic solution. A negative electrode having a negative electrode composition layer formed on the surface of a negative electrode current collector, the positive electrode composition and the negative electrode composition having a structure in which the negative electrode composition is laminated via a separator, a battery container, A battery that does not have a terminal arrangement and an electronic control unit (Reference: Japanese Industrial Standards JIS C8715-2 "Industrial lithium secondary battery cells and battery system"). Note that the lithium secondary cell 1 may be abbreviated as a cell in some cases.

  As shown in detail in FIG. 1, a unit cell 1 which is one embodiment of a battery cell includes a cathode current collector 7 which is a substantially flat resin current collector and a cathode current collector 7 including a cathode active material and an electrolytic solution on the surface thereof. The positive electrode 2 on which the plate-shaped positive electrode composition layer 5 is formed, and the substantially flat plate-like shape including a negative electrode active material and an electrolytic solution on the surface of a negative electrode current collector 8 which is also a substantially plate-shaped resin current collector The negative electrode 3 on which the negative electrode composition layer 6 is formed is similarly laminated with a substantially flat separator 4 interposed therebetween, and is formed in a substantially flat plate shape as a whole. Thus, the unit cell 1 having the positive electrode current collector 7 and the negative electrode current collector 8 on the upper surface and the lower surface in the drawing, respectively, is configured.

  The positive electrode current collector 7 and the negative electrode current collector 8 are positioned so as to face each other at a predetermined interval by a seal member 9 formed at an end of the unit cell 1. The end of the separator 4 is embedded in the sealing member 9 so that the separator 4 is supported and the positional relationship between the separator 4 and the positive electrode current collector 7 and the negative electrode current collector 8 is determined. I have.

  The distance between the positive electrode current collector 7 and the separator 4 and the distance between the negative electrode current collector 8 and the separator 4 are adjusted according to the capacity of the lithium ion battery L. The positional relationship between the current collector 8 and the separator 4 is determined so that a necessary interval can be obtained.

  The single cells 1 are stacked in series such that the upper surface of the positive electrode current collector 7 and the lower surface of the negative electrode current collector 8 of adjacent cells 1 are adjacent to each other to form a stacked battery module 21 having a substantially flat outer shape. Then, the stacked battery module 21 is housed in a container 20 while being sealed under reduced pressure to constitute a lithium ion battery L shown in FIG.

  Electrode terminals 10 and 11 are provided at the upper and lower portions of the stacked battery module 21 in FIG. More specifically, as best shown in FIG. 2, a conductive portion 10 a made of a conductive material is formed on the upper surface of the positive electrode current collector 7 of the unit cell 1 located on the uppermost layer of the stacked battery module 21. ing. As shown in FIG. 2, the conductive portion 10a extends from a plurality of strip-shaped stripe portions (band-shaped conductive portions, fusing portions) 10b extending in the longitudinal direction (the left-right direction in FIGS. 1 and 2) of the stacked battery module 21. Become.

  One end of the stripe portion 10b (the front left portion in FIG. 2) reaches the side surface of the stacked battery module 21. Further, these one ends become a single consolidating portion 10c made of a conductor that consolidates these one ends. They are connected in common, and the leading end of the consolidating portion 10c reaches the outside of the container 20 as shown in FIG. 1, and forms a connecting portion 10d. The electrode terminal 10 is configured by the stripe portion 10b, the aggregation portion 10c, and the connection portion 10d.

  Although not shown in detail, an electrode terminal 11 having the same configuration as the electrode terminal 10 is also provided on the lower surface of the negative electrode current collector 8 of the unit cell 1 located at the lowermost layer of the stacked battery module 21. ing. 1 and 2, only the conductive portion 11a, the aggregation portion 11c, and the connection portion 11d are shown.

  As shown in FIG. 1, the container 20 constituting the lithium ion battery L of the present embodiment is divided into an upper container 20a and a lower container 20b. The upper container 20a and the lower container 20b are formed in substantially the same shape, and the upper container body 20c and the lower container body 20d whose upper surfaces are open, and the left and right ends of the upper container body 20c and the lower container body 20d in FIG. It has a pair of upper container edges 20e and lower container edges 20f that project laterally from the portion.

  Then, the stacked battery module 21 is housed in an internal space formed by arranging the upper container 20a and the lower container 20b to face each other, and in a state where the internal space is decompressed, the upper container edge 20e and The lithium ion battery L of the present embodiment is configured by sealing the lower container edge 20f with a seal member (not shown).

The positive electrode active material includes positive electrode active material particles. Examples of the positive electrode active material particles include a composite oxide of lithium and a transition metal (eg, LiCoO ₂ , LiNiO ₂ , LiMnO _2, and LiMn ₂ O ₄ ), and a transition metal oxide. (Eg, MnO ₂ and V ₂ O ₅ ), transition metal sulfides (eg, MoS ₂ and TiS ₂ ) and conductive polymers (eg, polyaniline, polypyrrole, polythiophene, polyacetylene, poly-p-phenylene, and polycarbazole). No.

Further, the negative electrode active material is composed of negative electrode active material particles, and examples of the negative electrode active material particles include graphite, non-graphitizable carbon, amorphous carbon, and a fired polymer compound (for example, carbonized by firing a phenol resin or a furan resin). ), Coke (eg, pitch coke, needle coke, petroleum coke, etc.), carbon fiber, conductive polymer (eg, polyacetylene and polyquinoline, etc.), tin, silicon, and metal alloys (eg, lithium-tin alloy, lithium) - silicon alloy, a lithium - aluminum alloy and lithium - aluminum - manganese alloy), and a composite oxide of lithium and transition metals (e.g., Li ₄ Ti ₅ O _12, etc.) and the like.

  In the cell 1, the positive electrode and the negative electrode active material particles are preferably coated active material particles having at least a part of the surface coated with a coating agent containing a coating resin and a conductive additive.

  The coating agent contains a coating resin, and when the periphery of the positive electrode active material particles is coated with the coating agent, a change in volume of the electrode is reduced, and expansion of the electrode can be suppressed. Examples of the coating resin include vinyl resin, urethane resin, polyester resin, polyamide resin, epoxy resin, polyimide resin, silicone resin, phenol resin, melamine resin, urea resin, aniline resin, ionomer resin, and polycarbonate. Among them, vinyl resin, urethane resin, polyester resin and polyamide resin are preferable.

  The conductive assistant is selected from materials having conductivity.

  Specifically, metal [aluminum, stainless steel (SUS), silver, gold, copper, titanium, etc.], carbon [graphite and carbon black (acetylene black, Ketjen black, furnace black, channel black, thermal lamp black, single layer) Carbon nanotubes, multi-walled carbon nanotubes, etc.), and mixtures thereof, but are not limited thereto.

  These conductive assistants may be used alone or in combination of two or more. Further, these alloys or metal oxides may be used. From the viewpoint of electrical stability, preferably, aluminum, stainless steel, carbon, silver, gold, copper, titanium and mixtures thereof, more preferably silver, gold, aluminum, stainless steel and carbon, more preferably carbon is there. In addition, these conductive assistants may be those obtained by coating a conductive material (metal among the above-mentioned conductive assistant materials) around a particle-based ceramic material or a resin material by plating or the like.

  It is also possible to use conductive fibers as the conductive assistant. Examples of the conductive fiber include carbon fibers such as PAN-based carbon fiber and pitch-based carbon fiber, conductive fibers obtained by uniformly dispersing a highly conductive metal or graphite in synthetic fibers, and metals such as stainless steel. Examples include fibrous metal fibers, conductive fibers in which the surfaces of organic fibers are coated with a metal, and conductive fibers in which the surfaces of organic fibers are coated with a resin containing a conductive substance. Among these conductive fibers, carbon fibers are preferred.

  The coated active material particles are, for example, in a state where the active material particles are put in a universal mixer and stirred at 30 to 500 rpm, a resin solution containing the coating resin is dropped and mixed over 1 to 90 minutes, and the conductive auxiliary agent is further added. It can be obtained by mixing, heating to 50 to 200 ° C. with stirring, reducing the pressure to 0.007 to 0.04 MPa, and holding for 10 to 150 minutes.

  As the electrolyte, an electrolyte containing an electrolyte and a non-aqueous solvent, which is used for manufacturing a lithium ion battery, can be used.

As the electrolyte, those used in ordinary electrolytes can be used. For example, lithium salts of inorganic acids such as LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ and LiClO ₄ , and LiN (CF ₃ SO ₂ ) ₂ , lithium salts of organic acids such as LiN (C ₂ F ₅ SO ₂ ) ₂ and LiC (CF ₃ SO ₂ ) ₃ . Among these, LiPF ₆ is preferable from the viewpoint of battery output and charge / discharge cycle characteristics.

  As the non-aqueous solvent, those used in ordinary electrolytic solutions and the like can be used. For example, lactone compounds, cyclic or chain carbonates, chain carboxylic esters, cyclic or chain ethers, phosphates, nitriles Compounds, amide compounds, sulfones, sulfolanes and the like and mixtures thereof can be used.

  One type of non-aqueous solvent may be used alone, or two or more types may be used in combination.

  Among the non-aqueous solvents, preferred from the viewpoint of battery output and charge / discharge cycle characteristics are lactone compounds, cyclic carbonates, chain carbonates and phosphates, and more preferred are lactone compounds, cyclic carbonates and chains. Carbonic acid ester is more preferable, and a mixed solution of cyclic carbonate and chain carbonate is more preferable. Particularly preferred is propylene carbonate (PC) or a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC).

  As the separator 4, polyethylene, polypropylene or the like, a polyolefin microporous membrane film, a multilayer film of a porous polyethylene film and polypropylene, a polyester fiber, an aramid fiber, a nonwoven fabric made of glass fiber, and the like, and silica on their surface, What adhere | attached the ceramic fine particles, such as alumina and titania, etc. are mentioned.

  The polymer material constituting the positive electrode current collector 7 and the negative electrode current collector 8, which are resin current collectors, may be a conductive polymer or a polymer having no conductivity.

  Polymer materials include polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), polycycloolefin (PCO), polyethylene terephthalate (PET), polyether nitrile (PEN), and polytetrafluoroethylene (PTFE). Styrene butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVdF), epoxy resin, silicone resin, or a mixture thereof.

  From the viewpoint of electrical stability, polyethylene (PE), polypropylene (PP), polymethylpentene (PMP) and polycycloolefin (PCO) are preferred, and polyethylene (PE), polypropylene (PP) and polymethylpentene are more preferred. (PMP).

  In addition, the resin current collector is used for improving the conductivity of the resin current collector containing a conductive polymer material, or imparting conductivity to the resin current collector containing a polymer material having no conductivity. For the purpose of performing, it is preferable to include a conductive filler. The conductive filler is selected from materials having conductivity. Preferably, from the viewpoint of suppressing ion permeation in the current collector, it is preferable to use a material having no conductivity with respect to ions used as the charge transfer medium. Specific examples include, but are not limited to, carbon materials, aluminum, gold, silver, copper, iron, platinum, chromium, tin, indium, antimony, titanium, nickel, and the like. These conductive fillers may be used alone or in combination of two or more. Further, these alloy materials such as stainless steel (SUS) may be used. From the viewpoint of corrosion resistance, aluminum, stainless steel, a carbon material, nickel, and more preferably a carbon material are preferred. In addition, these conductive fillers may be obtained by coating the above-mentioned metal with plating or the like around a particle-based ceramic material or a resin material.

  As a specific example of the resin current collector, a material obtained by dispersing 5 to 20 parts of acetylene black as a conductive filler in polypropylene and then rolling the same with a hot press machine is exemplified. In addition, the thickness is not particularly limited, and can be applied in the same manner as that of a known one or appropriately changed.

  The material forming the sealing member 9 is not particularly limited as long as it has a property of adhering to the positive electrode and the negative electrode current collectors 7 and 8 and is durable to the electrolytic solution. Thermosetting resins are preferred. Specific examples include an epoxy resin, a polyolefin resin, a polyurethane resin, and a polyvinylidene fluoride resin. An epoxy resin is preferable because of high durability and easy handling.

  Any material can be suitably applied to the container 20 as long as it can accommodate the stacked battery module 21 in the container 20. However, in consideration of the possibility that the cell 1 and the container 20 may come into contact with each other, the material forming the container 20 is preferably a material having an insulating property. In addition, since the container 20 is sealed under reduced pressure with the stacked battery module 21 housed therein, it is preferable that the material forming the container 20 is a material having flexibility and airtightness. Examples of such a material include a film called a laminate film, in which a metal foil is covered on both sides with a polymer film, a nonwoven fabric provided with airtightness, and the like.

  The electrode terminals 10, 11 and the conductive portions 10a, 11a and the like constituting the electrode terminals 10, 11 are formed of a conductor such as a metal. The material of the metal forming the electrode terminals 10 and 11 is not particularly limited, and as an example, aluminum, copper, nickel, titanium, or the like is publicly adopted. The process of manufacturing the electrode terminals 10 and 11 can also be arbitrarily selected from well-known ones. For example, the electrode terminals 10 and 11 cut and bent into a predetermined shape by press working or the like can be replaced with a conductive adhesive or the like. And a method of attaching them to the upper and lower surfaces of the positive electrode current collector 7 and the negative electrode current collector 8, respectively.

  Among the conductive portions 10a and 10b, the width and the thickness of the conductor forming the stripe portions 10b and 11b are determined by the conductivity of the stripe portions 10b and 11b when an abnormality such as an internal short circuit occurs in the lithium ion battery L. The size is set so that the body can melt. The dimensions of the conductors forming the stripe portions 10b and 11b are determined by the conductivity of the conductors, the current flowing through the stripe portions 10b and 11b when the conductors are melted, that is, the current should be interrupted by determining that an abnormality has occurred. It is determined in consideration of the current value and the like. As an example, the width of the stripe portions 10b and 11b is 0.5 to 1.0 mm.

  The unit cell 1 having the above-described configuration includes a positive electrode composition 5 containing a positive electrode active material and an electrolytic solution, and a negative electrode active material and an electrolytic solution on the surfaces of the positive electrode current collector 7 and the negative electrode current collector 8, respectively. To form the positive electrode 2 and the negative electrode 3. The method for forming the positive electrode 2 and the negative electrode 3 is arbitrary, and the positive electrode current collector 7 and the negative electrode electrode composition 6 are applied to the surfaces of the positive electrode current collector 7 and the negative electrode current collector 8, respectively. And various methods such as placing the positive electrode composition 5 and the negative electrode composition 6 on the respective surfaces of the negative electrode current collector 8 via a nozzle or the like and then leveling them to a predetermined thickness with a spatula or the like. Is mentioned. Thereafter, the positive electrode 2 and the negative electrode 3 are stacked with the separator 4 interposed therebetween, and the ends of the positive electrode current collector 7 and the negative electrode current collector 8, and the end of the separator 4 are further sealed with a sealing member 9, whereby the single cell 1 is formed. Can be manufactured.

  Next, the unit cells 1 manufactured by the above-described steps are stacked in series such that the upper surface of the positive electrode current collector 7 and the lower surface of the negative electrode current collector 8 of the adjacent unit cells 1 are adjacent to each other. After the electrode terminals 10 and 11 are attached to the stacked battery module 21 and then housed in the container 20, the inside of the container 20 is degassed under reduced pressure, and then sealed with the sealing member 9. The lithium ion battery L of the present embodiment can be manufactured.

  In the lithium-ion battery L to which the stacked battery module 21 of the present embodiment having the above-described configuration is applied, when an abnormality such as an internal short circuit occurs and a large current flows through the short-circuit portion, the electrode terminals 10 and 11 are configured. The conductor forming at least one of the stripe portions 10b and 11b of the conductive portions 10a and 11a is overheated by the large current, and as a result, the stripe portions 10b and 11b are melted and melted by melting. The current flowing through the stripe portions 10b and 11b is cut off. Therefore, the current flowing through the stacked battery module 21 is suppressed, preferably cut off, and the heat generation of the entire lithium ion battery L is suppressed.

  In addition, in the stacked battery module 21 of the present embodiment, one end of each of the stripe portions 10b and 11b extends to the side surface of the stacked battery module 21, and these one ends are shared by the single aggregated portions 10c and 11c. , The current collecting efficiency of the electrode terminals 10 and 11 during normal use can be maintained.

  In particular, in the unit cell 1 constituting the stacked battery module 21 of the present embodiment, a resin current collector is used for the positive electrode current collector 7 and the negative electrode current collector 8, and the resin current collector is a metal current collector. Therefore, it is necessary to increase the efficiency of current collection from the resin current collector to the electrode terminals 10 and 11 because the conductivity is low because the electron fluidity is low as compared to Therefore, in the stacked battery module 21 of the present embodiment, the effect of maintaining the current collection efficiency of the electrode terminals 10 and 11 during normal use is great.

(2nd Embodiment)
Next, FIG. 3 is a perspective view showing a stacked battery module according to a second embodiment of the present invention.

  The difference between the stacked battery module 21 of the present embodiment and the stacked battery module 21 of the first embodiment described above lies in the configuration of the electrode terminals 10 and 11. More specifically, one end of the stripe portion 10b constituting the conductive portion 10a is extended to the side surface of the stacked battery module 21, and these stripe portions 10b are formed of two or more groups (3 in the example shown in FIG. 3). (Six groups for each one stripe portion 10b), the stripe portions 10b are commonly connected to the connection portions 10e for each group, and the connection portions 10e of each group are connected to a single aggregation portion 10c. The leading end of the consolidating portion 10c reaches the outside of the container 20, as shown in FIG. 1, and is formed as a connecting portion 10d. The stripe section 10b, the connecting section 10e, the consolidating section 10c, and the connecting section 10d constitute an electrode terminal 10.

  Further, also in the present embodiment, the electrode terminal 11 has the same configuration as the electrode terminal 10. FIG. 3 shows only the connection portion 11d.

  Therefore, according to this embodiment, the same effects as those of the above-described first embodiment can be obtained.

(Modification)
The specific configuration of the stacked battery module 21 of the present invention is not limited to the above embodiments, and various modifications are possible. As an example, the number and the like of the stripe portions 10b and 11b are not limited to the illustrated example, and the number and the like are not limited as long as abnormal current can be suppressed and preferably cut off.

L Lithium ion battery 1 Single cell 2 Positive electrode 3 Negative electrode 4 Separator 5 Positive electrode composition 6 Negative electrode composition 7 Positive electrode current collector 8 Negative electrode current collector 9 Seal member 10, 11 Electrode terminal 10a, 11a Conductive part 10b Stripe part ( Fusing section)
10c, 11c Aggregation unit 10d, 11d Connection unit 10e Connection unit 20 Container 21 Stacked battery module

Claims (3)

A flat battery cell having a first-pole resin current collector serving as a first surface and a second-pole resin current collector serving as a second surface is connected to the first face and the first face of a pair of adjacent battery cells. In the stacked battery module which is stacked so that the second surfaces are adjacent to each other,
The stacked battery module has conductive portions on its upper and lower surfaces ,
With the upper surface and fusing part at least one of the conductive portion provided on the lower surface is blown with a constant or more current flows,
The fusing portion is formed by forming a conductor in a band shape, and is formed of a plurality of band-shaped conductive portions extending in one direction of the stacked battery module,
The strip-shaped conductive portion has one end, which is the end in the one direction, reaching the side surface on the one end side of the stacked battery module,
A side surface of the stacked battery module, laminated, wherein aggregating the one end of the strip-shaped conductive portion, and wherein the common that electrically connected to intensive parts Ru comprising a <br/> to the strip conductor portion Type battery module. The stacked battery module according to claim 1 ,
A portion of the plurality of strip-shaped conductive portions reaching the side surface on the one end side of the stacked battery module is divided into two or more groups, and the plurality of strip-shaped conductive portions are commonly connected to each other in each group. a connecting portion,
The aggregating unit is stacked battery module according to claim <br/> be a single integrated section for connecting the connecting portions of each of said groups having. In the stacked cell module according to any one of claims 1-2,
The battery cell includes a positive electrode in which a positive electrode composition layer containing a positive electrode active material and an electrolyte is formed on the surface of a positive resin current collector, and a negative electrode active material and an electrolyte on the surface of a negative resin current collector. And a negative electrode on which a negative electrode electrode composition layer including: is laminated with a separator interposed therebetween, and at least one of the positive electrode active material and the negative electrode active material contains a conductive additive and a polymer. A stacked battery module comprising at least one of a positive electrode active material and a negative electrode active material covered with a layer.

Images