JP2017004799A - Lithium ion battery and structure system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize an internal space provided at a structure.SOLUTION: The lithium ion battery includes: a structure including an internal space; a separator, disposed at the internal space of the structure, separating the internal space into a positive electrode chamber and a negative electrode chamber; and a positive electrode composition containing positive electrode active material and an electrolyte and a negative electrode composition containing negative electrode active material and an electrolyte, filling the positive electrode chamber and the negative electrode chamber, respectively.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lithium ion battery and a structure system provided in a structure.

  Structures such as those configured to be self-propelled and robots that perform self-supporting walking are well known. Such a structure is often provided with a power source such as a lithium ion battery in order to enable itself to run and the like. As an example, a technique has been proposed in which a battery storage chamber corresponding to a box-shaped battery is provided in the trunk of a legged mobile robot (see Patent Document 1).

JP 2012-125869 A

  However, in the structure such as the conventional robot described above, a battery such as a lithium ion battery as a power source is formed in a substantially box shape, so it is necessary to bother to secure a space for storing the battery inside the structure. was there. On the other hand, in order to make the structure operable, it is preferable to reduce the weight of the structure itself. Accordingly, a part of the structure may be formed hollow. However, the hollow part of such a structure is often free-form, and it has been difficult to use it as a space for storing a conventional battery.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a lithium ion battery and a structure system capable of effectively using an internal space provided in the structure.

  The present invention provides a structure having an internal space, a separator that is disposed in the internal space and divides the accommodating portion into a positive electrode chamber and a negative electrode chamber, a positive electrode active material filled in each of the positive electrode chamber and the negative electrode chamber, and electrolysis At least one of the above-described problems is solved by a lithium ion battery comprising a positive electrode composition containing a liquid and a negative electrode composition containing a negative electrode active material and an electrolyte.

  Since each of the positive electrode chamber and the negative electrode chamber is filled with the positive electrode composition and the negative electrode composition, the free-form internal space provided in the structure can be used, and the inner surface of the structure, the positive electrode and the negative electrode composition The gap between the objects can be made sufficiently small.

  Here, the structure is preferably configured to be operable by a power source from a lithium ion battery. In addition, it is preferable that at least a part of the inner surface of at least one of the positive electrode chamber and the negative electrode chamber is formed with a curved surface. In addition, a current collector is preferably provided in each of the positive electrode chamber and the negative electrode chamber.

  Moreover, it is preferable to coat at least a part of at least one of the positive electrode composition and the negative electrode composition with a layer mainly composed of a conductive additive and a polymer. Furthermore, at least one of the positive electrode composition and the negative electrode composition preferably contains a fibrous material. In this case, the fibrous material is preferably carbon fiber.

  Further, the present invention is applied to a structure system driven by a lithium ion battery. And at least a part of this structure system, comprising a structure having an internal space and a lithium ion battery provided in the housing portion of the structure, the lithium ion battery is disposed in the internal space, A separator that divides the internal space into a positive electrode chamber and a negative electrode chamber; a positive electrode composition comprising a positive electrode active material and an electrolyte filled in each of the positive electrode chamber and the negative electrode chamber; and a negative electrode active material and an electrolyte. By providing the negative electrode composition, at least one of the above-mentioned problems is solved.

  ADVANTAGE OF THE INVENTION According to this invention, the lithium ion battery and structure system which can use effectively the internal space provided in the structure can be provided.

It is a perspective view which shows the shape of the electrode and separator of a lithium ion battery which are 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the lithium ion battery of 1st Embodiment. It is a perspective view which shows the external shape of the lithium ion battery of 1st Embodiment. It is a perspective view which shows a part of example of the robot with which the lithium ion battery of 1st Embodiment was applied. It is a partially broken perspective view which shows the lithium ion battery which is 2nd Embodiment of this invention. It is a partially broken perspective view which shows the lithium ion battery which is 3rd Embodiment of this invention. It is a perspective view which shows a part of example of the robot with which the lithium ion battery of 3rd Embodiment was applied.

(First embodiment)
With reference to FIGS. 1-4, the lithium ion battery which is 1st Embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing shapes of electrodes and separators of a lithium ion battery according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the lithium ion battery of the first embodiment, and FIG. 3 is a first embodiment. FIG. 4 is a perspective view showing a part of an example of a robot to which the lithium ion battery of the first embodiment is applied.

  In the lithium ion battery L of the present embodiment, as shown in FIG. 1, a part of the structure 1 such as a robot is formed in a truncated cone shape, and the interior is formed hollow so that an internal space 1 a is formed. A substantially semi-conical trapezoidal positive electrode current collector 7 and a negative electrode current collector 8 are disposed along the inner surface of the internal space 1a of the structure 1 so as to face each other with the flat separator 4 interposed therebetween. The current collector 7, the negative electrode current collector 8, and the separator 4 are sealed with a seal member 9 as shown in FIG. 1, the internal space 1a of the structure 1 is divided into the positive electrode chamber 2 and the negative electrode chamber 3 by the separator 4, and the positive electrode current collector 7 is disposed in the positive electrode chamber 2, and the negative electrode The negative electrode current collector 8 is disposed in the chamber 3.

  Further, the positive electrode current collector 7 and the negative electrode current collector 8 are provided along the inner surface of the internal space 1a of the frustoconical structure 1, while the separator 4 is formed in a flat plate shape. 7 and the negative electrode current collector 8 have portions that are not equidistant from the separator 4. The outer surfaces of the positive electrode current collector 7 and the negative electrode current collector 8 may be insulated.

  As shown in FIG. 2, the positive electrode chamber 2 and the negative electrode chamber 3 are filled with the positive electrode active material 5 and the negative electrode active material 6 respectively, and as shown in FIG. 3, the positive electrode current collector 7 and the negative electrode current collector 8 The lithium ion battery L of this embodiment is formed by sealing the upper and lower openings in the figure with the lid 10. In filling the positive electrode active material 5 and the negative electrode active material 6, prior to the step of sealing the lower lid 10, the positive electrode current collector 7 and the negative electrode current collector 8 are turned upside down, and the positive electrode in this state What is necessary is just to fill the active material 5 and the negative electrode active material 6 and to seal the lid 10 accordingly. At this time, a part of the positive electrode current collector 7 and the negative electrode current collector 8 is extended to the upper surface of the lid 10 positioned above in FIG. 3, and this extended part is formed in the electrode terminals 7a and 8a. Is preferred.

  Here, in this specification, “filled” means a state in which the positive electrode active material particles and the negative electrode active material particles are accommodated in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. This means that the material particles, the negative electrode active material particles, and the electrolyte are accommodated in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. More preferably, it means a state in which positive electrode active material particles and negative electrode active material particles are mixed with an electrolyte.

  In the present invention, the positive electrode chamber 2 and the negative electrode chamber 3 are filled with the positive electrode composition and the negative electrode composition. Each of the positive electrode active material or the negative electrode active material may be put into the positive electrode chamber 2 and the negative electrode chamber 3, respectively. You may carry out by putting the slurry-like positive electrode composition and negative electrode composition which contain particle | grains and electrolyte solution in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. When the powdered positive electrode active material and the negative electrode active material particles are directly put into the positive electrode chamber 2 and the negative electrode chamber 3, the positive electrode composition and the negative electrode are respectively added to the positive electrode chamber 2 and the negative electrode chamber 3 by adding an electrolytic solution thereafter. The composition is filled.

  When a slurry-like material containing a positive electrode active material or negative electrode active material particles and a non-aqueous solvent is put in the positive electrode chamber 2 and the negative electrode chamber 3, respectively, the active material particles and the non-aqueous solvent can be separated by pressurization or decompression thereafter. The positive electrode composition and the negative electrode composition are filled in each of the positive electrode chamber 2 and the negative electrode chamber 3 by allowing the non-aqueous solvent to pass through the membrane and further adding an electrolyte. When the positive electrode active material or negative electrode active material particles and the slurry-like positive electrode composition and negative electrode composition containing the electrolytic solution are put in the positive electrode chamber 2 and the negative electrode chamber 3, respectively, the active material particles are further pressurized or reduced in pressure. And a step of increasing the content of the positive electrode active material and the negative electrode active material contained in each of the positive electrode composition and the negative electrode composition by passing through a membrane capable of separating the electrolyte and the electrolyte and removing a part of the electrolyte Also good.

  The membrane capable of separating the active material particles and the non-aqueous solvent or the electrolytic solution is not limited as long as it is a membrane capable of separating the active material particles and the non-aqueous solvent solvent or the electrolytic solution, but the current collector and / or A film provided as a separator is preferred.

  When the positive electrode and negative electrode active material particles are filled in the positive electrode chamber 2 and the negative electrode chamber 3, the positive electrode and negative electrode active material particles are uniformly distributed in the positive electrode chamber 2 and the negative electrode chamber 3 by applying vibration and impact to the structure 1. Filling is preferred.

  In addition, the substance obtained by mixing the positive electrode, negative electrode active material particles and the electrolytic solution is usually in the form of a slurry, but depending on the weight ratio of the positive electrode, negative electrode active material particles and the electrolytic solution, it is a gel-like substance or a substance close to powder. Sometimes.

  And after depressurizing the inside of the structure 1, the opening part of this structure 1 is sealed using a sealing member etc., and an example of the lithium ion battery L of this invention can be manufactured.

The positive electrode active material particles constituting the positive electrode active material 5 include composite oxides of lithium and transition metals (for example, LiCoO ₂ , LiNiO ₂ , LiMnO ₂ and LiMn ₂ O ₄ ), transition metal oxides (for example, 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).

In addition, as the negative electrode active material particles constituting the negative electrode active material 6, graphite, non-graphitizable carbon, amorphous carbon, polymer compound fired body (for example, those obtained by firing and carbonizing a phenol resin, a furan resin, etc.), Coke (for example, pitch coke, needle coke and petroleum coke), carbon fiber, conductive polymer (for example, polyacetylene and polyquinoline), tin, silicon, and metal alloy (for example, lithium-tin alloy, lithium-silicon alloy, lithium) -Aluminum alloy and lithium-aluminum-manganese alloy), composite oxides of lithium and transition metal (for example, Li ₄ Ti ₅ O ₁₂ ) and the like.

  In the battery of the present invention, the positive electrode and negative electrode active material particles are preferably coated active material particles in which at least a part of the surface is 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, the volume change of the electrode is alleviated and the 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, polycarbonate, and the like. Among these, vinyl resin, urethane resin, polyester resin or polyamide resin is preferable.

  As a conductive support agent, it selects from the material which has electroconductivity.

  Specifically, metal [aluminum, stainless steel (SUS), silver, gold, copper, titanium, etc.], carbon [graphite, carbon black (acetylene black, ketjen black, furnace black, channel black, thermal lamp black, etc.), Single-walled carbon nanotubes and 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. Moreover, these alloys or metal oxides may be used. From the viewpoint of electrical stability, aluminum, stainless steel, carbon, silver, gold, copper, titanium and mixtures thereof are preferred, silver, gold, aluminum, stainless steel and carbon are more preferred, and carbon is more preferred. is there. These conductive assistants may be those obtained by coating a particulate ceramic material or resin material with a conductive material (metal among the conductive auxiliary materials described above) by plating or the like.

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

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

  The slurry material containing the active material particles is preferably an electrolyte solution slurry containing an electrolyte solution or a solvent slurry containing a non-aqueous solvent.

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

As the electrolyte, those used in ordinary electrolytic solutions can be used. For example, lithium salts of inorganic acids such as LiPF ₆ , LiBF ₄ , LiSbF ₆ , LiAsF ₆ and LiClO ₄ , LiN (CF ₃ SO ₂ ) ₂ and 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 can be used, for example, lactone compounds, cyclic or chain carbonates, chain carboxylates, cyclic or chain ethers, phosphates, nitriles. Compounds, amide compounds, sulfones, sulfolanes and the like and mixtures thereof can be used.

  A non-aqueous solvent may be used individually by 1 type, and may use 2 or more types together.

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

  The slurry-like substance is preferably prepared by dispersing and slurrying the active material particles and the conductive additive at a concentration of 10 to 60% by weight based on the weight of the electrolytic solution or the non-aqueous solvent.

  As the separator 4, polyethylene, polypropylene, etc., microporous membrane film made of polyolefin, multilayer film of porous polyethylene film and polypropylene, non-woven fabric made of polyester fiber, aramid fiber, glass fiber, etc., and silica on the surface thereof, Examples include those having ceramic fine particles such as alumina and titania attached thereto.

  As the current collectors 7 and 8, a metal current collector or a resin current collector can be used. As the metal current collector, a known metal current collector can be used. For example, the metal current collector is selected from the group consisting of copper, aluminum, titanium, nickel, tantalum, niobium, hafnium, zirconium, zinc, tungsten, bismuth, antimony, and alloys containing one or more of these, and stainless steel alloys. It is preferable that it consists of 1 or more types. The metal current collector may be formed from a thin plate or a metal foil, or a metal layer may be formed on the surface of the substrate by a technique such as sputtering, electrodeposition, or coating.

  The polymer material constituting the resin current collector 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), 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 preferable, and polyethylene (PE), polypropylene (PP) and polymethylpentene are more preferable. (PMP).

  In addition, the resin current collector is intended to improve the conductivity of the resin current collector containing the conductive polymer material, or to impart conductivity to the resin current collector containing the polymer material having no conductivity. Therefore, it is preferable that a conductive filler is included. 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 that does not have 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. Moreover, these alloy materials, such as stainless steel (SUS), may be used. From the viewpoint of corrosion resistance, aluminum, stainless steel, carbon material, nickel, and more preferably carbon material are preferred. In addition, these conductive fillers may be those obtained by coating the metal shown above with a plating or the like around a particulate ceramic material or resin material.

  Specific examples of the resin current collector include those obtained by dispersing 5 to 20 parts of acetylene black as a conductive filler in polypropylene and then rolling with a hot press. Moreover, the thickness is not particularly limited, and can be applied in the same manner as known ones or with appropriate changes.

  The material constituting the seal member is not particularly limited as long as it is a material that has adhesiveness to the current collectors 7 and 8 and is durable to the electrolytic solution. However, the material is a polymer material, particularly a thermosetting resin. Is preferred. Specific examples include epoxy resins, polyolefin resins, polyurethane resins, and polyvinylidene fluoride resins. Epoxy resins are preferable because they are highly durable and easy to handle.

  As shown in FIG. 4, the lithium ion battery L according to the present embodiment is an example of the inside of the upper arm of a robot that is an example of a structure that forms part of a structure system that is driven by a lithium ion battery such as a robot. And used as a power battery for driving the robot. Thereby, the structure system of this embodiment is constructed.

  The lithium ion battery L of the present embodiment having the above configuration includes a positive electrode active material 5 and a negative electrode composition that are positive electrode compositions in the positive electrode chamber 2 and the negative electrode chamber 3 provided in the internal space 1a of the structure 1 respectively. Since the negative electrode active material 6 is filled, the lithium ion battery L can be provided in the free-form internal space 1a provided in the structure 1, and the inner surface of the internal space 1a and the positive electrode The gap between the active material 5 and the negative electrode active material 6 can be made sufficiently small. Therefore, according to the present embodiment, a lithium ion battery that can effectively use the internal space 1 a provided in the structure 1 can be realized.

  Moreover, in the lithium ion battery L of this embodiment, since the lithium ion battery L can be incorporated into the structure 1 constituting a part of the structure system such as a robot, the battery capacity can be further increased. As a result, a structure system such as a robot can be driven for a long time. In addition, a space for storing a battery for driving a robot or the like can be saved. Thus, by increasing the battery capacity and omitting the battery storage space, for example, it is possible to make a robot that moves hands or runs independently.

  Further, since the lithium ion battery L of the present embodiment does not dry the positive electrode active material and the negative electrode active material by heat-treating the positive electrode active material and the negative electrode active material as in the conventional lithium ion battery, A phenomenon that can occur in the battery, and it is difficult to expect that the positive or negative electrode active material will peel from the current collector to obtain the desired output when the entire battery is bent when the entire battery is bent. Can be prevented from occurring.

(Second Embodiment)
In the first embodiment described above, a single plate-like separator having a surface directed in a single direction is used, and the lithium ion battery L is formed and then housed in the structure 1. It is also possible to form the structure 1 and the lithium ion battery L integrally with each other.

  Here, the separator having a plurality of planes means a separator in a state having a plurality of planes whose surfaces are directed in at least two different directions.

  FIG. 5 shows a lithium ion battery according to a second embodiment of the present invention, in which the separator has a plurality of planes whose surfaces are directed in at least two different directions, and is formed integrally with the structure 1. 2 is a partially broken perspective view showing a lithium ion battery L. FIG.

  Also in the lithium ion battery L of the present embodiment, a part of the structure 1 is formed in a truncated cone shape, and the interior thereof is formed hollow to form an internal space 1a, and a separator is formed inside the internal space 1a. 4 is arranged, and this internal space 1 a is divided into a positive electrode chamber 2 and a negative electrode chamber 3. In the lithium ion battery L of the present embodiment, as shown in FIG. 5, the separator 4 includes a plurality of planes whose surfaces are oriented in at least two different directions by combining a plurality of flat plates at a predetermined angle. As a whole, the separator has a triangular wave shape.

  On the inner surface of the structure 1, a fixing portion 1 b that protrudes inward from the inner surface of the structure 1 is formed. A triangular wave-shaped groove 1c extending in the vertical direction in FIG. 5 is formed at the tip of the fixed portion 1b, and the separator 4 is structured by fitting the separator 4 into the groove 1c via a seal member 9. It is fixed in the internal space 1 a of the body 1.

  In the internal space 1a, a substantially semi-conical trapezoidal positive electrode current collector 7 and negative electrode current collector 8 face each other in the positive electrode chamber 2 and the negative electrode chamber 3 along the inner surface of the structure 1 respectively. Is arranged. In the state where the positive and negative electrode current collectors 7 and 8 are disposed in the positive electrode chamber 2 and the negative electrode chamber 3, the positive electrode and negative electrode active materials 5 and 6 (not shown in FIG. 5) are the positive electrode chamber 2 and the negative electrode chamber 3, respectively. The lithium ion battery L of the present embodiment is formed by sealing the upper and lower openings in the figure of the structure 1 with the lid 10.

  In filling the positive electrode active material 5 and the negative electrode active material 6, for example, two through holes communicating with the positive electrode chamber 2 and the negative electrode chamber 3 are formed in the lower lid 10, and the positive electrode and the negative electrode active material are formed from these through holes. After the substances 5 and 6 are filled in the positive electrode chamber 2 and the negative electrode chamber 3, respectively, the through holes may be sealed.

  In the present embodiment, the positive electrode current collector 7 and the negative electrode current collector 8 are attached to the upper part in the figure with electrode terminals 11 and 12 separate from the positive electrode current collector 7 and the negative electrode current collector 8, These electrode terminals 11 and 12 extend to the upper surface of the lid 10 located at the upper side in the drawing.

  The specific configurations of the separator 4, the positive and negative electrode active materials 5 and 6, the positive and negative electrode current collectors 7 and 8, and the seal member 9 are the same as described in the first embodiment. The description is simplified.

  As an example, the lithium ion battery L of the present embodiment is also housed in the structure 1 constituting the upper arm portion of a robot which is an example of a structure system, and is used as a power supply battery for driving the robot. Thereby, the structure system of this embodiment is constructed.

  Accordingly, even in the lithium ion battery L of the present embodiment, the lithium ion battery L can be incorporated inside the arm or the like of the structure 1 constituting a part of the robot or the like which is a structure system. The shell can be used as it is to make a battery. Therefore, the same effects as those of the first embodiment described above can be obtained.

  Furthermore, in the lithium ion battery L of the present embodiment, since the separator 4 is formed in a triangular wave shape as a whole, the surface area can be secured larger than that of the flat separator 4, thereby An excellent effect that a large output can be obtained can be achieved.

  Note that the shape of the separator 4 in the lithium ion battery L of the present embodiment is not limited to the triangular wave shape as shown in FIG. 5, and can be applied to the separator 4 of the present embodiment as long as the shape is a combination of a plurality of flat plates. As an example, various shapes such as a rectangular wave shape and a sawtooth wave shape can be employed.

(Third embodiment)
In each of the above-described embodiments, an example in which the lithium ion battery L is formed in the hollow internal space 1a provided in the main body of the structure 1 that is a part of the structure system such as a robot has been described. However, the lithium ion battery L of the present invention may be provided not only in the main body of the structure 1 but also in, for example, a detachable attachment.

  6 is a partially broken perspective view showing a lithium ion battery according to a third embodiment of the present invention, and FIG. 7 is a perspective view showing a part of an example of a robot to which the lithium ion battery according to the third embodiment is applied. is there.

  As best shown in FIG. 7, the lithium ion battery L of the present embodiment is formed inside the structure 1 constituting the shoulder pad of the robot R. As shown in FIG. 6, the structure 1 is formed in an outer shape, and a fixing tool 13 serving as an electrode is provided on the inner surface of the end portion. On the other hand, the robot R is also provided with an engagement portion (not shown) that engages with the fixture 13, and the structure 1 is a structure system by engaging the fixture 13 and the engagement portion. Removably fixed to the robot body.

  As shown in FIG. 6, the structure 1 is divided into an upper structure 1d having a substantially semi-elliptical cross section and a lower structure 1e having a substantially rectangular cross section. An internal space 1a is formed between the upper structure 1d and the lower structure 1e.

  A fixing portion 1f protruding inward from the lower structure 1e is formed on the inner surface of the upper portion of the lower structure 1e, and a flat plate separator 4 is placed on the fixing portion 1f. Is fixed in the internal space 1 a of the structure 1, and the internal space 1 a is divided into a positive electrode chamber 2 and a negative electrode chamber 3 by the separator 4.

  In the internal space 1a, the positive electrode current collector 7 and the negative electrode current collector 8 face each other along the upper inner surface of the upper structure 1d and the lower inner surface of the lower structure 1e. Each is disposed in the negative electrode chamber 3. The positive and negative electrode current collectors 7 and 8 are disposed in the positive electrode chamber 2 and the negative electrode chamber 3, and the positive and negative electrode active materials 5 and 6 are filled in the positive electrode chamber 2 and the negative electrode chamber 3, respectively. The side portions of the structural body 1d and the lower structural body 1e are sealed by the sealing member 9, so that the lithium ion battery L of the present embodiment is formed.

  In filling the positive electrode active material 5 and the negative electrode active material 6, for example, two through holes communicating with the positive electrode chamber 2 and the negative electrode chamber 3 are formed in the upper structure 1d and the lower structure 1e, respectively. The positive and negative electrode active materials 5 and 6 are filled in the positive electrode chamber 2 and the negative electrode chamber 3, respectively, and then the through holes are sealed.

  The specific configurations of the separator 4, the positive and negative electrode active materials 5 and 6, the positive and negative electrode current collectors 7 and 8, and the seal member 9 are the same as described in the first embodiment. The description is simplified.

  As an example, the lithium ion battery L of the present embodiment is also housed in the structure 1 constituting the structure system, as shown in FIG. 4, and this structure 1 is attached to the shoulder of the robot R. Used as a power supply battery for driving the robot R. Thereby, the structure system of this embodiment is constructed.

  Accordingly, even in the lithium ion battery L of the present embodiment, the lithium ion battery L can be incorporated inside the structure 1 that is detachably provided on the robot R that constitutes the structure system. Can be made into a battery. Therefore, the same effects as those of the first embodiment described above can be obtained.

(Modification)
The details of the lithium ion battery L and the structure system of the present invention are not limited to the above-described embodiments, and various modifications are possible. As an example, in the above-described embodiment, the lithium ion battery L is housed in the structure 1 constituting the upper arm portion of the robot R. However, the battery may be formed not only on the arm but also on the leg and other portions. Further, the outer shape of the lithium ion battery L may be a three-dimensional free-form surface having a complicated shape such as a human arm or leg. The outer shape of the lithium ion battery according to the present invention is not particularly limited as long as it is appropriately selected from arbitrary shapes.

  On the other hand, the shape of the separator 4 is not particularly limited, but the manufacturing process of the separator 4 and the like can be simplified by forming it in a flat plate shape as in the first embodiment. Further, the shape of the positive electrode current collector 7 and the negative electrode current collector 8 is not particularly limited, but the positive electrode and negative electrode current collectors are arranged along the inner surface of the structure 1 constituting the lithium ion battery as in the above-described embodiment. The provision of the electric conductors 7 and 8 is preferable because the capacity of the positive electrode composition and the negative electrode composition filled in the positive electrode chamber 2 and the negative electrode chamber 3 can be increased. Furthermore, at least the positive and negative electrode current collectors 7 and 8 and the separator 4 have portions that are not equally spaced, so that the storage space inside the structure 1 can be used more effectively.

  EXAMPLES Next, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples without departing from the gist of the present invention. Unless otherwise specified, “part” means “part by weight” and “%” means “% by weight”.

(Preparation of resin solution for coating)
A four-necked flask equipped with a stirrer, thermometer, reflux condenser, dropping funnel and nitrogen gas inlet tube was charged with 83 parts of ethyl acetate and 17 parts of methanol, and the temperature was raised to 68 ° C. Next, a monomer compounded liquid in which 242.8 parts of methacrylic acid, 97.1 parts of methyl methacrylate, 242.8 parts of 2-ethylhexyl methacrylate, 52.1 parts of ethyl acetate and 10.7 parts of methanol were blended, and 2,2′- An initiator solution prepared by dissolving 0.263 parts of azobis (2,4-dimethylvaleronitrile) in 34.2 parts of ethyl acetate and stirring with a dropping funnel over 4 hours while blowing nitrogen into a four-necked flask. The radical polymerization was carried out by dropping continuously. After the completion of dropping, an initiator solution prepared by dissolving 0.583 parts of 2,2′-azobis (2,4-dimethylvaleronitrile) in 26 parts of ethyl acetate was continuously added using a dropping funnel over 2 hours. Furthermore, the polymerization was continued for 4 hours at the boiling point. After removing the solvent to obtain 582 parts of resin, 1,360 parts of isopropanol was added to obtain a coating resin solution comprising a vinyl resin having a resin concentration of 30% by weight.

(Preparation of coated positive electrode active material particles)
96 parts by weight of LiCoO ₂ powder [Nippon Chemical Industry Co., Ltd. Cellseed C-8G] was put in a universal mixer and stirred at room temperature and 150 rpm, and the resin solution for coating (resin solid content concentration 30% by weight) was resin. The mixture was added dropwise over 60 minutes so that the solid content was 2 parts by weight, and the mixture was further stirred for 30 minutes.

  Next, 2 parts by weight of acetylene black [Denka Black (registered trademark) manufactured by Denki Kagaku Kogyo Co., Ltd.] was mixed in three portions with stirring, and the temperature was raised to 70 ° C. while stirring for 30 minutes, until 100 mmHg. The pressure was reduced and held for 30 minutes. The coated positive electrode active material particles were obtained by the above operation.

(Preparation of coated negative electrode active material particles)
Resin for coating in a state where 90 parts by weight of non-graphitizable carbon [Carbotron (registered trademark) PS (F) manufactured by Kureha Battery Materials Japan Co., Ltd.] is stirred in a universal mixer at 150 rpm. The solution (resin solid content concentration: 30% by weight) was added dropwise and mixed over 60 minutes so that the resin solid content was 5 parts by weight, and the mixture was further stirred for 30 minutes.

  Next, 5 parts by weight of acetylene black [Denka Black (registered trademark) manufactured by Denki Kagaku Kogyo Co., Ltd.] was mixed in three portions with stirring, and the mixture was heated to 70 ° C. with stirring for 30 minutes. The pressure was reduced to 01 MPa and held for 30 minutes. The coated negative electrode active material particles were obtained by the above operation.

(Preparation of electrolyte)
LiPF ₆ was dissolved at a rate of 1 mol / L in a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) (volume ratio 1: 1) to prepare an electrolytic solution for a lithium ion battery.

(Production of positive electrode-coated active material slurry)
67 parts by weight of the coated positive electrode active material, carbon fiber [Osaka Gas Chemical Co., Ltd. Donacarbo Mild S-243: average fiber length 500 μm, average fiber diameter 13 μm] 1 part by weight, and 32 parts by weight of the above electrolyte were mixed. A positive electrode-coated active material slurry was prepared.

(Manufacture of negative electrode-coated active material slurry)
A negative electrode-coated active material slurry was prepared by mixing 52 parts by weight of coated negative electrode active material particles, 1 part by weight of the same carbon fiber used in the production of the positive electrode-coated active material slurry, and 47 parts by weight of the electrolytic solution.

(Manufacture of lithium ion batteries 1)
A positive electrode active material slurry was poured and a positive electrode active material slurry was injected to form a positive electrode active material layer. Subsequently, a negative electrode active material slurry was formed by spreading a separator and forming a negative electrode active material layer. Subsequently, after covering the negative electrode current collector, the structure (case) was sealed with an adhesive.

  In order to confirm the operation as a battery, a charge / discharge tester was connected to the lead portion from the current collector, and a charge / discharge test was performed. It was confirmed that charging / discharging was possible and functioned as a lithium ion secondary battery.

(Manufacture of lithium ion batteries 2)
The inside of a substantially frustoconical structure (case) sealed at the bottom was separated by a separator to form a positive electrode chamber and a negative electrode chamber, and a positive electrode current collector and a negative electrode current collector were provided on the respective inner walls. Subsequently, the positive electrode chamber and the negative electrode chamber were filled with a positive electrode active material slurry and a negative electrode active material slurry composed of a powdered positive electrode active material and a negative electrode active material and an electrolyte, respectively, and then the upper portion of the structure was sealed. .

  In order to confirm the operation as a battery, a charge / discharge tester was connected to the lead portion from the current collector, and a charge / discharge test was performed. Also in this case, it was confirmed that charging / discharging was possible and functioned as a lithium ion secondary battery.

L Lithium ion battery 1 Structure 1a Internal space 2 Positive electrode chamber 3 Negative electrode chamber 4 Separator 5 Positive electrode active material 6 Negative electrode active material 7a, 8a, 11, 12 Electrode terminal 7 Positive electrode current collector 8 Negative electrode current collector 9 Seal member 10 Lid

Claims (8)

A structure with an internal space;
A separator disposed in the internal space and dividing the internal space into a positive electrode chamber and a negative electrode chamber;
A lithium ion comprising: a positive electrode composition comprising a positive electrode active material and an electrolyte filled in each of the positive electrode chamber and the negative electrode chamber; and a negative electrode composition comprising a negative electrode active material and an electrolyte. battery. The lithium ion battery according to claim 1,
The structure is configured to be operable by a power source from the lithium ion battery. The lithium ion battery according to claim 1 or 2,
At least a part of the inner surface of at least one of the positive electrode chamber and the negative electrode chamber is formed as a curved surface. The lithium ion battery according to any one of claims 1 to 3,
A lithium ion battery, wherein a current collector is provided in each of the positive electrode chamber and the negative electrode chamber. In the lithium ion battery according to any one of claims 1 to 4,
Lithium ion, wherein at least part of at least one of the positive electrode composition and the negative electrode composition is covered with a layer mainly comprising a conductive additive and a polymer. battery. The lithium ion battery according to claim 5,
At least one of the positive electrode composition and the negative electrode composition contains a fibrous material. The lithium ion battery according to claim 6,
The lithium ion battery, wherein the fibrous substance is carbon fiber. A structure system driven by a lithium ion battery,
Comprising at least a part of a structure system, comprising a structure having an internal space, and a lithium ion battery provided in the housing portion of the structure;
The lithium ion battery is
A separator disposed in the internal space and dividing the internal space into a positive electrode chamber and a negative electrode chamber;
A structure comprising: a positive electrode composition containing a positive electrode active material and an electrolyte solution filled in each of the positive electrode chamber and the negative electrode chamber; and a negative electrode composition containing a negative electrode active material and an electrolyte solution. system.

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