JP5605344B2 - Battery evaluation jig and battery evaluation method - Google Patents

Description

  The present invention relates to a battery evaluation jig and a battery evaluation method. More specifically, the present invention relates to a battery evaluation jig and a battery evaluation method for evaluating the performance of a battery manufactured using a coating liquid without coating the electrode core material with a coating liquid.

  Generally, a battery is manufactured through various manufacturing processes. For example, in the manufacturing process of a lithium ion secondary battery, a coating liquid kneading step for kneading a coating liquid that becomes an electrode mixture layer (a positive electrode mixture layer and a negative electrode mixture layer) that causes an electrode reaction, and an electrode core material Electrode plate preparation step of applying electrode plate (positive electrode plate and negative electrode plate) by applying a coating liquid to (positive electrode core material and negative electrode core material), and a positive electrode plate and a negative electrode plate with a separator interposed therebetween In some cases, there are an electrode body preparation step of stacking and forming a stacked electrode body, and a battery assembly step of assembling a battery by inserting the stacked electrode body into the battery container and injecting an electrolyte.

  Therefore, battery performance evaluation, such as battery charge / discharge capacity and internal resistance, is performed after the manufacturing process as described above. However, from the viewpoint of quality control, it is preferable to evaluate the performance of the battery even in the initial stage of the manufacturing process. This is because when there is a problem with the quality of the battery, it is easy to identify in which manufacturing process the problem has occurred. In addition, it may be possible to grasp variations in quality of raw materials and the like.

  For this reason, techniques for testing the quality of a battery have been developed before the battery is a finished product. For example, Patent Document 1 discloses a method for evaluating lithium cobalt oxide. According to Patent Document 1, the quality of lithium cobalt oxide is evaluated by pressurizing lithium cobalt oxide powder, applying a constant DC voltage, and measuring a current value (paragraph of Patent Document 1). [0009] and FIGS. 1 and 2). Note that there is a correlation between the measured current value and the initial discharge capacity of the battery that is a finished product (see FIG. 2 of Patent Document 1).

  Patent Document 2 discloses an electrode plate test apparatus for evaluating the performance of an electrode plate of a lithium ion secondary battery (see FIGS. 1 and 2 of Patent Document 2). According to Patent Document 2, the performance of an electrode plate is evaluated in a state in which a test electrode plate and an electrode plate of opposite polarity are stacked with a separator interposed therebetween (Patent Document 2, paragraph [0005], [0006] and FIG. 2). Further, the electrode plate testing apparatus is provided with a gas vent hole for venting gas generated from the test electrode plate during measurement (see paragraph [0013] of FIG. 2 and FIG. 2).

JP 2000-277109 A JP 2000-285909 A

  However, the technique described in Patent Document 1 can only estimate the initial discharge capacity of the battery performance. That is, the internal resistance of the battery and other evaluation items cannot be evaluated. In addition, other materials mixed in the positive electrode coating solution and the negative electrode coating solution also affect the battery performance. And the subsequent process naturally affects the battery performance. On the other hand, the technique described in Patent Document 2 can only evaluate an electrode plate that has undergone a coating / drying process. That is, the performance of the battery cannot be evaluated from the kneaded coating solution before the coating / drying step.

  The present invention has been made to solve the above-described problems of the prior art. That is, the subject is to provide a battery evaluation jig and a battery evaluation method capable of evaluating the performance of the battery from the kneaded coating liquid without passing through the coating / drying process in the production line. It is to be.

The battery evaluation jig according to one aspect of the present invention, which has been made for the purpose of solving this problem, includes a positive electrode current collector portion on which a positive electrode mixture layer is formed, a negative electrode current collector portion on which a negative electrode mixture layer is formed, and , A container body provided with at least one of a positive electrode current collector and a negative electrode current collector, a lid that covers the opening of the container, a sealing member that seals a gap between the container and the lid, It has an electrolyte inflow part for inflowing the electrolyte toward the inside, and a gas outflow part for outflowing the gas toward the outside of the container. And at least one of a container main body and a cover body has at least one part of the status information detection part which detects the status information of a positive electrode current collection part or a negative electrode current collection part. Furthermore, the state information detected by the state information detection unit is information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer. In addition, the state information detection unit includes a displacement amount measurement unit that measures a displacement amount of the positive electrode current collector or the negative electrode current collector pressed by the current collector pressure member. By using such a battery evaluation jig, it is possible to obtain the battery state information by eliminating the influence of the processes after the coating / drying process, which is a normal battery manufacturing process. Further, by evaluating battery performance using pastes prepared under various material conditions and kneading conditions, it is possible to search for material conditions and kneading conditions for producing a battery with excellent battery performance. Furthermore, it is possible to inspect the reaction state of the reaction that occludes / releases lithium ions that occurs in the positive electrode mixture layer or the negative electrode mixture layer during charge / discharge of the battery. In addition, it is possible to measure the change over time in the amount of displacement in the thickness direction of the positive electrode mixture layer or the negative electrode mixture layer via the positive electrode current collector or the negative electrode current collector.

According to another aspect of the present invention, a battery evaluation jig includes a positive electrode current collector portion on which a positive electrode mixture layer is formed, a negative electrode current collector portion on which a negative electrode mixture layer is formed, a positive electrode current collector portion, and a negative electrode A container body provided with at least one of the current collector, a lid that covers the opening of the container, a sealing member that seals a gap between the container and the lid, and an electrolyte solution toward the inside of the container. It has an electrolyte inflow part for inflow and a gas outflow part for outflowing gas toward the outside of the container. And at least one of a container main body and a cover body has at least one part of the status information detection part which detects the status information of a positive electrode current collection part or a negative electrode current collection part. Furthermore, the state information detected by the state information detection unit is information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer. In addition, status information detecting unit, that have a pressure measuring unit for measuring the surface pressure acting on the positive electrode current collecting portion or the negative electrode current collecting portion. Thus, through the positive electrode current collecting portion and the negative electrode current collecting portion, Ru can be measured the change in surface pressure distribution caused by the volume change of the positive-electrode mixture layer and the negative-electrode mixture layer.

According to another aspect of the present invention, a battery evaluation jig includes a positive electrode current collector portion on which a positive electrode mixture layer is formed, a negative electrode current collector portion on which a negative electrode mixture layer is formed, a positive electrode current collector portion, and a negative electrode A container body provided with at least one of the current collector, a lid that covers the opening of the container, a sealing member that seals a gap between the container and the lid, and an electrolyte solution toward the inside of the container. It has an electrolyte inflow part for inflow and a gas outflow part for outflowing gas toward the outside of the container. And at least one of a container main body and a cover body has at least one part of the status information detection part which detects the status information of a positive electrode current collection part or a negative electrode current collection part. Furthermore, the state information detected by the state information detection unit is information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer. In addition, status information detecting section is arranged closer than the positive electrode current collector or the negative electrode current collecting portion of the container to the outside of the position, that having a infrared transmitting member which transmits infrared radiation. Therefore, due to the heat generated by the electrode reaction in the positive-electrode mixture layer and the negative-electrode mixture layer, Ru can measure the change in temperature of the cathode current collector portion and the negative electrode current collecting portion. In addition, it is possible to detect whether or not an internal short circuit occurs in the battery by an endurance test.

According to another aspect of the present invention, a battery evaluation jig includes a positive electrode current collector portion on which a positive electrode mixture layer is formed, a negative electrode current collector portion on which a negative electrode mixture layer is formed, a positive electrode current collector portion, and a negative electrode A container body provided with at least one of the current collector, a lid that covers the opening of the container, a sealing member that seals a gap between the container and the lid, and an electrolyte solution toward the inside of the container. It has an electrolyte inflow part for inflow and a gas outflow part for outflowing gas toward the outside of the container. And at least one of a container main body and a cover body has at least one part of the status information detection part which detects the status information of a positive electrode current collection part or a negative electrode current collection part. Furthermore, the state information detected by the state information detection unit is information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer. In addition, status information detecting unit that have a AE wave detection unit for detecting an acoustic emission (AE) wave generated inside the electrode mixture layer or the negative-electrode mixture layer. Therefore, Ru can be detected gas generating sound or the like attributable to the change in volume of the positive electrode composite material layer and the negative-electrode mixture layer. Thereby, the formation degree of the surface direction of a SEI film can be known.

  In the battery evaluation jig described above, the electrolyte inflow portion is a check valve that allows the fluid to flow in the direction toward the inside of the container body, and the gas outflow portion is the fluid in the direction toward the outside of the container body. It is good that it is a check valve that causes the gas to flow out. Since the electrolyte inflow portion is a check valve, there is no possibility that the electrolyte or gas leaks from the electrolyte inflow portion to the outside of the container. Moreover, since the gas outflow part is a check valve, the gas inside the container can be suitably extracted.

  In the battery evaluation jig described above, the lid body may be movable along the inner wall of the container body. This is because the battery performance can be measured with the evaluation battery loaded in the thickness direction.

Also, in another aspect of the present invention, there is provided a battery evaluation method, wherein one of a positive electrode coating liquid and a negative electrode coating liquid is supplied to a container to form a first paste layer, on the first paste layer. A separator is placed, and the other of the positive electrode coating liquid and the negative electrode coating liquid is supplied onto the separator to form a laminate as a second paste layer, and the inside of the container is depressurized. Thus, the solvent contained in the first paste layer and the second paste layer is volatilized to create a laminated electrode body, and an electrolytic solution is injected into the container to form an evaluation battery inside the container. And a reaction state detection step of detecting at least one reaction state of the positive electrode mixture layer and the negative electrode mixture layer by a reaction state detector while charging / discharging the evaluation battery. . The reaction state detected in the reaction state detection step is at least one of the temperature of the positive electrode mixture layer or the negative electrode mixture layer, the surface pressure distribution, the displacement amount in the thickness direction, and the AE wave. In such a battery evaluation method, the reaction state in the positive electrode mixture layer and the negative electrode mixture layer can be detected without going through the steps after the coating / drying step of applying the coating liquid to the electrode core material on the line. Can do. In addition, the basic performance of the battery, such as the internal resistance of the battery, can be measured, and reaction states in the positive electrode mixture layer and the negative electrode mixture layer can be detected from various angles.

  In the battery evaluation method described above, it is preferable that after the electrolytic solution injection step, there is an electrolytic solution impregnation step in which the inside of the container is decompressed and the separator is impregnated with the electrolytic solution. This is because the time for impregnating the separator with the electrolytic solution can be shortened.

  According to the present invention, there are provided a battery evaluation jig and a battery evaluation method capable of evaluating the performance of a battery from a kneaded coating solution without undergoing a coating / drying process in a production line. Yes.

It is a schematic block diagram for demonstrating the jig | tool for evaluation of the battery which concerns on 1st Embodiment. It is FIG. (1) for demonstrating the evaluation method of the battery which concerns on 1st Embodiment. FIG. 6 is a diagram (part 2) for explaining the battery evaluation method according to the first embodiment; FIG. 6 is a diagram (No. 3) for explaining the battery evaluation method according to the first embodiment; FIG. 6 is a diagram (part 4) for explaining the battery evaluation method according to the first embodiment; FIG. 6 is a diagram (No. 5) for explaining the battery evaluation method according to the first embodiment; It is a schematic block diagram for demonstrating the jig for evaluation of the battery which concerns on 2nd Embodiment. It is a figure for demonstrating the surface pressure distribution sensor used for the jig for battery evaluation which concerns on 2nd Embodiment. It is a schematic block diagram for demonstrating the jig | tool for evaluation of the battery which concerns on 3rd Embodiment. It is a schematic block diagram for demonstrating the jig for battery evaluation which concerns on 4th Embodiment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. The embodiment described below embodies the present invention regarding a battery evaluation jig and a battery evaluation method.

(First embodiment)
1. Battery Performance Evaluation Jig FIG. 1 shows a schematic configuration of an evaluation jig 100 according to this embodiment. The evaluation jig 100 is a jig for evaluating the battery performance of the evaluation battery created in the production line without going through the coating / drying process in the production line. The evaluation jig 100 includes a container 110, a lid 120, an O-ring 130, a positive electrode current collector 150, and a negative electrode current collector 160.

  The container 110 is for constituting an evaluation battery inside. The container 110 is opened above it. The lid 120 is for covering and closing the opening of the container 110. The material of the container 110 and the lid 120 is, for example, resin. Other materials may be used as long as they do not react with organic solvents and are insulative. A groove 113 is formed on the inner surface of the container 110. The groove 113 is for arranging the O-ring 130 between the container 110 and the lid 120. The O-ring 130 is a sealing member for closing and sealing the gap between the container 110 and the lid 120. Further, the O-ring 130 can slide within the range where the groove 113 is formed. Therefore, the lid 120 is movable along the inner wall of the container 110.

  The positive electrode current collector 150 is formed with a positive electrode mixture layer of an evaluation battery formed inside the evaluation jig 100. Then, after the evaluation battery is formed, the current is collected from the positive electrode mixture layer of the evaluation battery. The positive electrode current collector 150 is provided in the container 110. The surface 151 of the positive electrode current collector 150 is exposed at the bottom surface 112 inside the container 110. In FIG. 1, the surface 151 is a plane. However, it may be a curved surface. The material of the positive electrode current collector 150 is aluminum. Alternatively, stainless steel may be used. The surface 151 of the positive electrode current collector 150 may be plated with gold.

  The negative electrode current collector 160 is formed with a negative electrode mixture layer of an evaluation battery formed inside the evaluation jig 100. Then, after the evaluation battery is formed, the current is collected from the negative electrode composite material layer of the evaluation battery. The negative electrode current collector 160 is provided on the lid 120. The surface 161 of the negative electrode current collector 160 is exposed at the bottom surface 125 inside the lid 120. In FIG. 1, the surface 161 is a plane. However, it may be a curved surface. The material of the negative electrode current collector 160 is copper. Alternatively, stainless steel may be used. The surface 161 of the negative electrode current collector 160 may be plated with gold.

  The lid 120 is provided with check valves 122 and 123. The check valve 122 is an electrolyte inflow portion for injecting the electrolyte into the container 110. The check valve 122 can be in an open state or a closed state. The check valve 122 is attached in such a direction that the fluid outside the evaluation jig 100 can flow toward the inside of the container 110 in the opened state. When the check valve 122 is open, the fluid outside the container 110 can flow in the direction of arrow A in FIG.

  The check valve 123 is a gas outflow part for allowing the gas inside the container 110 to flow out of the container 110. The check valve 123 can also be in an open state and a closed state. The check valve 123 is attached in such a direction that the fluid inside the evaluation jig 100 can flow out of the container 110 in the opened state. When the check valve 123 is open, the fluid inside the container 110 can flow out in the direction of arrow B in FIG. When the check valves 122 and 123 are closed, the evaluation jig 100 is in a sealed state.

  The lid 120 is provided with a glass plate 170 at a position outside the container 110 from the negative electrode current collector 160. The glass plate 170 is an infrared transmitting member made of a material that transmits infrared light. This is because the temperature of the negative electrode current collector 160 is measured from the outside of the evaluation jig 100 using an infrared thermometer or the like. The infrared transmitting member constitutes at least a part of a state information detection unit that detects state information that changes due to an electrode reaction occurring in the negative electrode mixture layer NA. As a material of the glass plate 170, for example, quartz or barium fluoride may be used. This is because it transmits infrared rays and has a certain level of strength.

  As described below, the negative electrode current collector 160 is preferably thin. This is because the thinner the thickness, the smaller the heat capacity. What is desired to be measured using the evaluation jig 100 is the temperature of a negative electrode mixture layer NA (see FIGS. 3 to 6) described later. However, what is actually measured is the temperature of the negative electrode current collector 160 as described above.

2. Electrode Reaction Here, the electrode reaction that occurs in the positive electrode mixture layer PA (see FIGS. 3 to 6) and the negative electrode mixture layer NA (see FIGS. 3 to 6) will be described. The electrode reaction is a reaction that occurs in the positive electrode mixture layer PA and the negative electrode mixture layer NA accompanying charging or discharging. During charging, lithium ions are released from the positive electrode active material (lithium deintercalation) and occluded in the negative electrode active material (lithium intercalation). On the other hand, during discharge, lithium ions are released from the negative electrode active material and occluded in the positive electrode active material.

  By such occlusion of lithium ions, the positive electrode mixture layer PA and the negative electrode mixture layer NA expand. On the other hand, the positive electrode mixture layer PA and the negative electrode mixture layer NA contract due to the release of lithium ions. That is, if attention is paid to the positive electrode mixture layer PA or the negative electrode mixture layer NA, the expansion and contraction are repeated according to charge and discharge. That is, the volumes of the positive electrode mixture layer PA and the negative electrode mixture layer NA change with time. The volume change is greater in the negative electrode mixture layer NA than in the positive electrode mixture layer PA.

  Therefore, it is considered that the degree of temperature change is larger in the negative electrode mixture layer NA than in the positive electrode mixture layer PA. Therefore, in this embodiment, the temperature on the negative electrode side is measured. For this purpose, the glass plate 170 is disposed on the negative electrode mixture layer NA side.

3. Method for Creating Coating Liquid The battery for evaluation used in this embodiment can evaluate the performance as a battery without coating the coating liquid on the electrode core material on the production line. In preparing the evaluation battery, a positive electrode coating solution and a negative electrode coating solution are prepared. For this, a coating solution that is usually used may be used.

3-1. Preparation Method of Positive Electrode Coating Liquid The positive electrode coating liquid is prepared by mixing and kneading a positive electrode active material, a conductive material, a binder, and a thickener in a solvent.

As the positive electrode active material, lithium composite oxides such as lithium nickelate (LiNiO ₂ ), lithium manganate (LiMnO ₂ ), and lithium cobaltate (LiCoO ₂ ) are used.

  Carbon materials such as carbon powder and carbon fiber can be used as the conductive material for the positive electrode. For example, carbon powder such as acetylene black, furnace black, ketjen black, etc., graphite powder, etc.

  The binder for the positive electrode is preferably a polymer that is insoluble (or hardly soluble) in the electrolytic solution and is dispersed in the solvent used for the positive electrode coating solution. For example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoro Fluorine resin such as ethylene copolymer (ETFE), vinyl acetate copolymer, styrene butadiene rubber (SBR), acrylic acid-modified SBR resin (SBR latex), rubber such as gum arabic can be used. Alternatively, a combination of these may be used. The binder is not necessarily limited to the above polymer.

  As the thickener for the positive electrode, cellulose such as carboxymethylcellulose (CMC), methylcellulose (MC), cellulose acetate phthalate (CAP), hydroxypropylmethylcellulose (HPMC), hydroxypropylmethylcellulose phthalate (HPMCP) or the like is used. However, it is not necessarily limited to cellulose as described above, and can be used.

  An example of the solvent is water. In addition, N-methyl-2-pyrrolidone (NMP, hereinafter referred to as NMP) may be used. Other lower alcohols and lower ketones can also be used.

3-2. Preparation Method of Negative Electrode Coating Liquid The negative electrode coating liquid is prepared by mixing a negative electrode active material, a binder, and a thickener in a solvent and kneading them.

  The negative electrode active material is a material that can occlude and release lithium ions. As the negative electrode active material, a carbon-based material containing a graphite structure at least partially is used. For example, amorphous carbon, non-graphitizable carbon (hard carbon), graphitizable carbon (soft carbon), graphite (graphite), or a carbon material having a combination thereof can be used.

  The binder for the negative electrode may be a polymer that is insoluble (or hardly soluble) in the electrolytic solution and is dispersed in the solvent used in the negative electrode coating solution. For example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoro Fluorine resin such as ethylene copolymer (ETFE), vinyl acetate copolymer, styrene butadiene rubber (SBR), acrylic acid-modified SBR resin (SBR latex), rubber such as gum arabic can be used. Alternatively, a combination of these may be used. The binder is not necessarily limited to the above polymer.

  As the thickener for the negative electrode, cellulose such as carboxymethylcellulose (CMC), methylcellulose (MC), cellulose acetate phthalate (CAP), hydroxypropylmethylcellulose (HPMC), hydroxypropylmethylcellulose phthalate (HPMCP) or the like is used. However, it is not necessarily limited to cellulose as described above, and can be used.

  An example of the solvent is water. NMP may be used. Other lower alcohols and lower ketones can also be used.

4). Battery Evaluation Method Here, a battery evaluation method using the evaluation jig 100 of this embodiment will be described.

4-1. Paste Laminating Step First, a positive electrode coating solution is supplied into the container 110. The positive electrode coating solution is in the form of a paste. Therefore, the positive electrode coating solution spreads wet on the bottom surface of the container 110. Thereby, the positive electrode paste layer PA1 as shown in FIG. 2 is formed.

  Next, the separator S is placed on the positive electrode paste layer PA1. Subsequently, a negative electrode coating solution is supplied onto the separator S. The negative electrode coating solution is also in the form of a paste. Therefore, the negative electrode coating solution spreads on the separator S. Thereby, the negative electrode paste layer NA1 as shown in FIG. 2 is formed. Then, the lid 120 is put on the container 110. At this time, the O-ring is sealed so that there is no gap between the container 110 and the lid 120.

  At this time, inside the container 110, as shown in FIG. 2, a laminate is formed in which the positive electrode paste layer PA1, the separator S, and the negative electrode paste layer NA1 are laminated in this order from the bottom in the figure. However, at this stage, the positive electrode paste layer PA1 and the negative electrode paste layer NA1 are not yet dried. That is, the positive electrode paste layer PA1 and the negative electrode paste layer NA1 remain pasty.

4-2. Solvent Volatilization Step Subsequently, as shown in FIG. 3, the evaluation jig 100 in which the laminated body is formed is placed inside the vacuum chamber 201. FIG. 3 is a diagram schematically showing this state. The vacuum chamber 201 is provided with an air release valve 202, an exhaust valve 203, and a glove box 205. The vacuum chamber 201 is connected to the vacuum pump 204 via the exhaust valve 203.

  The air release valve 202 is for switching between a state where the inside and the outside of the vacuum chamber 201 communicate with each other and a state where they do not communicate with each other. The exhaust valve 203 is for switching between a state where the vacuum chamber 201 and the vacuum pump 204 are in communication and a state where they are not in communication. The glove box 205 is an opening / closing part that allows an operator to put a hand inside the vacuum chamber 201 to work.

  At the stage where the evaluation jig 100 in which the laminated body is formed is placed in the vacuum chamber 201, the check valve 122 is in a closed state and the check valve 123 is in an open state. Alternatively, the operator may operate the check valves 122 and 123 from the glove box 205 after the evaluation jig 100 is disposed inside the vacuum chamber 201.

  Then, the exhaust valve 203 is opened. Subsequently, air is sucked from the inside of the vacuum chamber 201 by the vacuum pump 204. This suction is indicated by an arrow C in FIG. As the air is sucked, the pressure inside the vacuum chamber 201 decreases. At the same time, the gas inside the evaluation jig 100 leaks from the check valve 123 toward the inside of the vacuum chamber 201 (see arrow D in FIG. 3). Therefore, the pressure inside the evaluation jig 100 also decreases.

  Thus, when the inside of the evaluation jig 100 is depressurized, the solvent contained in the positive electrode paste layer PA1 and the negative electrode paste layer NA1 is volatilized. Then, the volatilized solvent flows out from the check valve 123 into the vacuum chamber 201 along with the air inside the evaluation jig 100 in the direction of arrow D in FIG. Therefore, the positive electrode paste layer PA1 and the negative electrode paste layer NA1 are dried by the suction of air inside the vacuum chamber 201 by the vacuum pump 204. When these dryings are sufficiently advanced, the vacuuming by the vacuum pump 104 is stopped.

  After the drying, the positive electrode current collector 150, the positive electrode mixture layer PA, the separator S, the negative electrode mixture layer NA, the negative electrode are arranged in the evaluation jig 100 from the lower side, as shown in FIG. A stacked electrode body that is stacked in the order of the current collector 160 is formed.

4-3. Electrolyte Injection Step Next, the air release valve 202 is opened. Thereby, air flows into the vacuum chamber 201 as indicated by an arrow E in FIG. Accordingly, the atmospheric pressure inside the vacuum chamber 201 gradually approaches atmospheric pressure. When the inflow of air from the air release valve 202 to the inside of the vacuum chamber 201 ceases, an electrolyte is injected from the check valve 122 into the container 110. At this time, the check valve 122 is of course open. Therefore, the electrolytic solution is supplied into the evaluation jig 100 as indicated by an arrow F in FIG. A pipette or the like is used for the injection of the electrolytic solution. By injecting the electrolytic solution, a battery is formed inside the evaluation jig 100.

  The electrolytic solution to be injected here is an electrolyte dissolved in an organic solvent. Examples of organic solvents include propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), 1,2-dimethoxyethane, 1,2-diethoxyethane. , Tetrahydrofuran, 2-methyltetrahydrofuran, dioxane, 1,3-dioxolane, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, acetonitrile, propionitrile, nitromethane, N, N-dimethylformamide, dimethyl sulfoxide, sulfolane, γ-butyrolactone, etc. A solvent or a combination of these can be used.

Further, as electrolyte salts, lithium perchlorate (LiClO ₄ ), lithium borofluoride (LiBF ₄ ), lithium hexafluorophosphate (LiPF ₆ ), lithium hexafluoroarsenate (LiAsF ₆ ), LiCF ₃ SO ₃ , LiC ₄ F ₉ SO ₃ , LiN (CF ₃ SO ₂ ) ₂ , LiC (CF ₃ SO ₂ ) ₃ , LiI and the like can be used.

4-4. Electrolyte impregnation step After injecting the electrolyte into the evaluation jig 100, the inside of the vacuum chamber 201 is decompressed again. Thereby, the inside of the evaluation jig 100 is also decompressed. Therefore, the electrolyte inside the evaluation jig 100 is impregnated inside the separator S. When the internal pressure of the vacuum chamber 201 reaches a predetermined pressure, the air release valve 202 is opened again. Then, the evaluation jig 100 is taken out from the vacuum chamber 201.

  At this stage, the positive electrode current collector 150, the positive electrode mixture layer PA, the separator S, the negative electrode mixture layer NA, and the negative electrode current collector 160 are stacked in this order from the lower side in the evaluation jig 100. A laminated electrode body is formed. The separator S is impregnated with the electrolytic solution. That is, the evaluation battery is formed inside the evaluation jig 100. Here, the evaluation jig 100 is taken out from the vacuum chamber 201.

4-5. Next, the evaluation jig 100 is restrained in a pressurized state. As shown in FIG. 5, the evaluation jig 100 is sandwiched between the restraining jigs 301 and 302. Here, the restraining jig 302 is provided with a glass window 303. The same material as that of the glass plate 170 may be used. At that time, the restraining jig 301 pressurizes the bottom surface 111 of the container 110. The restraining jig 302 pressurizes the upper surface 121 of the lid 120. Specifically, the restraining jig 301 and the restraining jig 302 are tightened with screws. As a result, the evaluation jig 100 can be pressed at a constant pressure in the direction of arrow G in FIG. 5 and constrained in the pressed state.

  Here, the O-ring 130 can slide between the container 110 and the lid 120. By this pressurization, the distance between the bottom surface 111 of the container 110 and the top surface 121 of the lid 120 is slightly reduced. At this time, the positive electrode mixture layer PA and the negative electrode mixture layer NA are mainly compressed. In addition, there is no possibility that the container 110 and the lid 120 are damaged by this pressurization.

  By suitably performing this pressurization, it is possible to suppress variations in voltage within the positive electrode mixture layer PA and the negative electrode mixture layer NA, and to stabilize the initial performance of the evaluation battery. Moreover, when manufacturing a positive electrode plate and a negative electrode plate, there exists a press process which carries out the roll press of these, However The effect of this press process will also be acquired by this laminated body restraint process.

4-6. Measurement process (reaction state detection process)
Subsequently, as shown in FIG. 6, an evaluation jig 100 in which a chargeable / dischargeable evaluation battery is formed is connected to the circuit. Here, the evaluation jig 100 remains pressed and restrained by the restraining jigs 301 and 302. Therefore, the evaluation battery formed inside the evaluation jig 100 is measured for various evaluation items and temperatures while remaining in a restrained state.

  As shown in FIG. 6, the positive electrode current collector 150 and the negative electrode current collector 160 are connected to the charging / discharging device 410 or the impedance measuring device 420. The charging / discharging device 410 is for measuring the charging / discharging capacity of the evaluation battery formed on the evaluation jig 100. It is also possible to measure the internal resistance of the battery. The cycle characteristics can also be evaluated. The impedance measuring device 420 is for measuring the impedance of the evaluation battery formed on the evaluation jig 100.

  The charging / discharging device 410 and the impedance measuring device 420 are connected to the control PC 400. The control PC 400 is for controlling the charging / discharging device 410 and the impedance measuring device 420.

  As shown in FIG. 6, an infrared thermography 430 is arranged at a position facing the glass window 303 in the evaluation jig 100 after restraint. The infrared thermography 430 is an infrared thermometer for measuring the temperature of the negative electrode current collector 160. The infrared thermography 430, together with the glass plate 170, constitutes a state information detection unit that detects state information that changes due to an electrode reaction of the negative electrode mixture layer NA. Therefore, the measurement step also serves as a reaction state detection step for detecting the reaction state of the electrode reaction in the negative electrode mixture layer NA. The negative electrode current collector 160 is sufficiently thin and has a small heat capacity. Therefore, the temperature of the negative electrode current collector 160 is almost equal to the temperature of the negative electrode mixture layer NA.

  The infrared thermography 430 is connected to the data logger 440. The data logger 440 is for accumulating temperature data measured by the infrared thermography 430. The data logger 440 is connected to the analysis PC 450. The analysis PC 450 is an analysis unit for performing analysis by associating various evaluation items with the temperature of the negative electrode mixture layer NA according to the charge / discharge state of the evaluation battery. Note that an amplifier may be used as necessary. Further, the analysis PC 450 itself may serve as the data logger 440. In that case, it is not necessary to use the data logger 440 separately.

  As described above, the evaluation jig 100 forms an evaluation battery therein. Here, since the coating / drying process in the production line has not been performed, the coating solution and the battery performance can be evaluated correspondingly. After measuring the necessary evaluation items of the evaluation battery, the evaluation jig 100 is disassembled and the positive electrode mixture layer PA and the negative electrode mixture layer NA are wiped off. Can be used.

5. Evaluation Example Here, an actual evaluation example will be described. For example, an experiment can be conducted on the relationship between the shear rate (1 / s) when kneading the negative electrode coating solution and the internal resistance (Ω) of the battery. First, a negative electrode coating solution kneaded at a certain shear rate is prepared. The shear rate is a speed corresponding to the rotational speed of the rotary blade when kneading the negative electrode coating liquid. Then, an evaluation battery is formed inside the evaluation jig 100 using the negative electrode coating liquid. Subsequently, the internal resistance of the evaluation battery is measured.

  In this way, the internal resistance of the evaluation battery is measured by changing the shear rate when the negative electrode coating solution is prepared. When the shear rate is low, the internal resistance of the battery made at that shear rate is high. As the shear rate is gradually increased, the internal resistance of the battery decreases accordingly. Above a certain shear rate, the internal resistance of the battery increases as the shear rate increases. In other words, it means that there is an optimum value to adopt as the shear rate. Then, the shear rate, internal resistance, and temperature can be correlated and analyzed.

  The above evaluation method can also be applied to the positive electrode coating solution. In addition, the battery can be evaluated by changing the material itself for preparing the coating liquid or the blending ratio. The battery can also be evaluated by changing the standing time after kneading the same coating solution. This is because even with the same coating solution, the viscosity and the like usually change with time. Furthermore, the difference in battery performance between different lots for the same material can be evaluated. The results obtained here exclude the influence of the coating / drying process.

6). Modification 6-1. Replacement of positive electrode and negative electrode In this embodiment, the temperature of the negative electrode current collector 160 on the negative electrode mixture layer NA side is measured. However, the temperature on the positive electrode mixture layer PA side may be measured. Therefore, the negative electrode mixture layer NA may be disposed on the main body side of the container 110 and the positive electrode mixture layer PA may be disposed on the lid body 120 side. In that case, the negative electrode current collector 160 may be provided in the container 110 and the positive electrode current collector 150 may be provided in the lid 120. Then, the glass plate 170 may be disposed on the positive electrode current collector 150.

6-2. Arrangement on the main body side In this embodiment, the lid 120 is provided with the glass plate 170. However, the glass plate 170 may be provided on the main body side of the container 110. In that case, the temperature of the positive electrode current collector 150 and the negative electrode current collector 160 may be measured by the infrared thermography 430 from the glass plate 170 side. Further, the temperature on the negative electrode mixture layer NA side may be measured by providing the glass plate 170 and the negative electrode current collector 160 in the container 110.

6-3. It arrange | positions at the main body side and the cover body side Moreover, it is good also as providing a glass plate in both the main body side and the cover body 120 of the container 110. Thereby, the temperature of both positive electrode mixture layer PA and negative electrode mixture layer NA can be measured.

6-4. Arrangement of Check Valve In this embodiment, the check valves 122 and 123 are provided on the lid 120. However, it may be formed at other locations. For example, it may be formed on the side surface of the container 110. Of course, other locations are possible.

6-5. Restraint jigs Restraint jigs 301 and 302 were used to press and restrain the evaluation jig 100. However, other presses may be used. And what is necessary is just to restrain the jig | tool 100 for evaluation with the restraint tool which maintains the pressurization state. As described above, other jigs and devices may be used as long as the evaluation jig 100 is pressurized from above and below during measurement of the evaluation battery.

6-6. Electrolyte impregnation step In this embodiment, after the electrolyte is injected into the evaluation jig 100, the inside of the evaluation jig 100 is decompressed. This is because the separator S is impregnated with the electrolytic solution. However, if the evaluation jig 100 into which the electrolytic solution is injected is left unattended, the electrolytic solution penetrates into the separator S without reducing the pressure inside the evaluation jig 100. Therefore, it is not always necessary to depressurize the inside of the evaluation jig 100. However, the penetration of the electrolytic solution into the separator S is faster when the electrolytic solution impregnation step of reducing the pressure inside the evaluation jig 100 is performed.

6-7. Laminated body constraining step In this embodiment, the evaluation jig 100 on which the evaluation battery is formed is pressed and constrained. However, when forming an evaluation battery other than the lithium ion secondary battery, it is not necessary to pressurize and restrain the evaluation battery 100. In that case, the laminated body restraining step may be omitted.

6-8. Glass material for all lids In this embodiment, the glass plate 170 is provided on the lid 120. However, the lid 120 itself may be a glass material. In that case, of course, it is not necessary to arrange the glass plate 170 separately. Similarly, the container 110 itself can be made of a glass material.

7). Summary As described above in detail, the evaluation jig 100 according to the present embodiment forms an evaluation lithium ion secondary battery therein. Here, since the coating / drying process in the production line has not been performed, the kneaded coating liquid, the performance of the battery produced by the coating liquid, and the negative electrode mixture layer NA (or the positive electrode mixture layer PA) The temperature can be evaluated correspondingly.

  In addition, the battery evaluation method according to the present embodiment is a method including a solvent volatilization step in which the inside of the evaluation jig 100 is decompressed using the vacuum chamber 201. Therefore, the battery can be evaluated by removing the influence that may occur in the coating / drying process in the production line. Therefore, it is possible to perform the evaluation by associating the coating solution with the performance of the lithium ion secondary battery created using the coating solution.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, it is not limited to a lithium ion secondary battery. Any battery that uses an electrode plate prepared by coating and drying a coating solution on the electrode core material can be applied.

(Second Embodiment)
A second embodiment will be described. The evaluation jig of this embodiment is characterized in that a pressure sensor is provided instead of the glass plate 170 used in the evaluation jig of the first embodiment. Therefore, the following description will focus on differences from the evaluation jig 100 described in the first embodiment.

1. Battery Performance Evaluation Jig An evaluation jig 500 of this embodiment is shown in FIG. The evaluation jig 500 includes a pressure sensor 510 in addition to each part of the evaluation jig 100 described in the first embodiment. In addition, unlike the evaluation jig 100, the glass plate 170 is not provided. As the pressure sensor 510, any one of a semiconductor piezoresistive type, a capacitance type, a pressure-sensitive conductive ink type, a strain gauge resistance type, and a silicon resonant type may be used. Of course, other things may be used.

  The pressure sensor 510 is for measuring a pressure change due to a volume change of the positive electrode mixture layer PA and the negative electrode mixture layer NA. At locations where this volume change is large, lithium ion storage and release should occur actively. That is, the electrode reaction is actively taking place at that point. As described above, this volume change is larger in the negative electrode mixture layer NA than in the positive electrode mixture layer PA. That is, the change in the surface pressure due to the volume change in the negative electrode mixture layer NA is mainly measured.

  The pressure sensor 510 is disposed between the main body of the lid 520 and the negative electrode current collector 160. The pressure sensor 510 is a pressure measurement unit for measuring the surface pressure received from the negative electrode current collector 160, that is, the pressure distribution over the contact surface. What we want to know here is the pressure distribution due to the volume change of the negative electrode mixture layer NA transmitted to the pressure sensor 510 via the negative electrode current collector 160. Therefore, it is preferable that the negative electrode current collector 160 is thin. This is because the expansion and contraction of the negative electrode mixture layer NA can be measured sensitively.

  FIG. 8 is a plan view showing the pressure sensor 510. The pressure sensor 510 includes a measurement unit 511 and a wiring 512. The measurement part 511 is for measuring the applied pressure. This pressure is measured at each point of the mesh point. Thereby, a surface pressure distribution is obtained over the surface of the measurement unit 511. The wiring 512 is for transmitting information on the pressure measured by the measuring unit 511 to the data logger 440. Or it is good also as transmitting directly to PC450 for analysis.

2. Battery Evaluation Method The battery evaluation method in the present embodiment is the same as the battery evaluation method in the first embodiment. However, the data to be measured is of course the pressure. In the laminate restraining step described in the first embodiment, the evaluation battery may be restrained with a restraining force suitable for measuring the shrinkage / expansion of the negative electrode mixture layer NA.

3. Modified Example 6-1 described in the first embodiment. To 6-7. The above modifications can also be applied to this embodiment.

4). Summary As described above in detail, the evaluation jig 500 according to the present embodiment forms an evaluation lithium ion secondary battery therein. Here, since the coating / drying process in the production line has not been performed, the kneaded coating liquid, the performance of the battery produced by the coating liquid, and the negative electrode mixture layer NA (or the positive electrode mixture layer PA) The surface pressure distribution resulting from the volume change can be evaluated correspondingly.

  In addition, the battery evaluation method according to the present embodiment is a method including a solvent volatilization step in which the inside of the evaluation jig 100 is decompressed using the vacuum chamber 201. Therefore, the battery can be evaluated by removing the influence that may occur in the coating / drying process in the production line. Therefore, it is possible to perform the evaluation by associating the coating solution with the performance of the lithium ion secondary battery created using the coating solution.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, it is not limited to a lithium ion secondary battery. Any battery that uses an electrode plate prepared by coating and drying a coating solution on the electrode core material can be applied.

(Third embodiment)
A third embodiment will be described. The evaluation jig of this embodiment is characterized in that a displacement meter is provided instead of the glass plate 170 used in the evaluation jig of the first embodiment. Therefore, the following description will focus on differences from the evaluation jig 100 described in the first embodiment.

1. Battery Performance Evaluation Jig An evaluation jig 600 of this embodiment is shown in FIG. The evaluation jig 600 includes a cylindrical member 630 and a sheet 640 in addition to each part of the evaluation jig 100 described in the first embodiment. In addition, unlike the evaluation jig 100, the glass plate 170 is not provided.

  The cylindrical member 630 is a part of a thickness displacement measuring unit for measuring the displacement in the thickness direction of the negative electrode mixture layer NA. The cylindrical member 630 is a resin member having a cylindrical shape. The sheet 640 is made of resin. The sheet 640 is formed with a plurality of through holes corresponding to the cylindrical outer surface of the cylindrical member 630. Therefore, cylindrical members 630 are inserted into the through holes of the sheet 640, respectively. This is because the coordinates for fixing the cylindrical member 630 are determined. Therefore, the size and number of the cylindrical members 630 to be arranged may be arbitrarily set.

2. Battery Evaluation Method The battery evaluation method in the present embodiment is the same as the battery evaluation method in the first embodiment. However, not only the data to be measured but also the displacement in the thickness direction of the negative electrode mixture layer NA. The amount of displacement in the thickness direction of the negative electrode mixture layer NA is measured by the position of the upper surface of the cylindrical member 630. A displacement sensor (not shown) may be used for the measurement. As the displacement sensor, a known sensor such as a laser, an infrared ray, or an ultrasonic wave can be used. Of these, a non-contact type may be used.

  In this embodiment, since the amount of displacement in the thickness direction of the negative electrode mixture layer NA due to the electrode reaction is measured, the laminate restraining step performed in the first embodiment is not performed.

3. Modification The modification (6-1.6-4.6-6.) Described in the first embodiment can also be implemented in this embodiment.

3-1. Shape of Cylindrical Member In this embodiment, the cylindrical member 630 has a cylindrical shape. However, it is of course applicable not only to the cylindrical shape. For example, other polygonal column shapes may be used. However, if the number of sides on the bottom surface is small, such as a triangular prism, a relatively large stress may be applied near the apex when tilted. For this reason, it is preferable that the number of sides is large to some extent, or is cylindrical as in this embodiment.

3-2. Inclination of the cylindrical member In this embodiment, the amount of displacement in the thickness direction of the negative electrode mixture layer NA is measured, but the inclination of the cylindrical member 630 may also be measured. At a location where the inclination of the cylindrical member 630 is large, a larger internal stress is applied than at other locations. That is, local peeling is likely to occur at that portion of the negative electrode mixture layer NA.

4). Summary As described above in detail, the evaluation jig 600 according to the present embodiment forms an evaluation lithium ion secondary battery therein. Here, since the coating / drying process in the production line has not been performed, the kneaded coating liquid, the performance of the battery produced by the coating liquid, and the negative electrode mixture layer NA (or the positive electrode mixture layer PA) The displacement amount in the thickness direction due to the volume change can be evaluated correspondingly.

  In addition, the battery evaluation method according to the present embodiment is a method including a solvent volatilization step in which the inside of the evaluation jig 100 is decompressed using the vacuum chamber 201. Therefore, the battery can be evaluated by removing the influence that may occur in the coating / drying process in the production line. Therefore, it is possible to perform the evaluation by associating the coating solution with the performance of the lithium ion secondary battery created using the coating solution.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, it is not limited to a lithium ion secondary battery. Any battery that uses an electrode plate prepared by coating and drying a coating solution on the electrode core material can be applied.

(Fourth embodiment)
A fourth embodiment will be described. The evaluation jig of this embodiment is characterized in that it includes an AE sensor instead of the glass plate 170 used in the evaluation jig of the first embodiment. The AE sensor is a sensor for detecting an acoustic emission (AE) wave. Therefore, the following description will focus on differences from the evaluation jig 100 described in the first embodiment.

1. Battery Performance Evaluation Jig An evaluation jig 700 of this embodiment is shown in FIG. The evaluation jig 700 has a plurality of AE sensors 730 in addition to each part of the evaluation jig 100 described in the first embodiment. In addition, unlike the evaluation jig 100, the glass plate 170 is not provided.

  The AE sensor 730 detects cracking sound of the negative electrode mixture layer NA caused by the volume change of the negative electrode mixture layer NA caused by charging and discharging. It also detects gas generation noise that is generated by charging and discharging. This gas is generated when the SEI film is formed.

  In FIG. 10, the AE sensor 730 is disposed on the negative electrode current collector 160. Further, a plate material that hardly absorbs an elastic wave generated from the negative electrode mixture layer NA may be disposed between the AE sensor 730 and the negative electrode current collector 160.

2. Battery Evaluation Method The battery evaluation method in the present embodiment is the same as the battery evaluation method in the first embodiment. However, not only data to be measured but also AE waves generated inside the negative electrode mixture layer NA. The upper part of the AE sensor 730 is not covered with the lid 720. Therefore, in the laminated body restraining step, the outer peripheral edge of the lid 720 where the AE sensor 730 is not placed is restrained. Therefore, the positive electrode current collector 150 and the negative electrode current collector 160 are preferably thicker. This is because the positive electrode current collector 150 and the negative electrode current collector 160 are not easily bent.

3. Modified Example 6-1 described in the first embodiment. To 6-7. The above modifications can also be applied to this embodiment. The feature points described from the first embodiment to the present embodiment described above may be combined.

4). Summary As described above in detail, the evaluation jig 700 according to the present embodiment forms an evaluation lithium ion secondary battery therein. Here, since the coating / drying process in the production line has not been performed, the kneaded coating liquid, the performance of the battery produced by the coating liquid, and the negative electrode mixture layer NA (or the positive electrode mixture layer PA) A sound wave generated due to a volume change can be evaluated correspondingly.

  In addition, the battery evaluation method according to the present embodiment is a method including a solvent volatilization step in which the inside of the evaluation jig 100 is decompressed using the vacuum chamber 201. Therefore, the battery can be evaluated by removing the influence that may occur in the coating / drying process in the production line. Therefore, it is possible to perform the evaluation by associating the coating solution with the performance of the lithium ion secondary battery created using the coating solution.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, it is not limited to a lithium ion secondary battery. Any battery that uses an electrode plate prepared by coating and drying a coating solution on the electrode core material can be applied.

100, 500, 600, 700 ... Evaluation jig 110 ... Container 111 ... Bottom 120, 520, 620, 720 ... Lid 121 ... Top 122, 123 ... Check valve 130 ... O-ring 150 ... Positive current collector 151 ... Surface 160 ... Negative electrode current collector 161 ... Surface 170 ... Glass plate 201 ... Vacuum chamber 202 ... Air release valve 203 ... Exhaust valve 204 ... Vacuum pump 205 ... Glove box 301, 302 ... Restraint jig 400 ... Control PC
410: Charge / discharge device 420 ... Impedance measurement device 430 ... Infrared thermography 440 ... Data logger 450 ... Analysis PC
510 ... Pressure sensor 630 ... Cylindrical member 640 ... Sheet 730 ... AE sensor PA ... Positive electrode mixture layer PA1 ... Positive electrode paste layer NA ... Negative electrode mixture layer NA1 ... Negative electrode paste layer S ... Separator

Claims (8)

A positive electrode current collector portion on which a positive electrode mixture layer is formed;
A negative electrode current collector portion on which a negative electrode mixture layer is formed;
A container body provided with at least one of the positive electrode current collector and the negative electrode current collector;
A lid covering the opening of the container;
A sealing member for sealing a gap between the container and the lid;
An electrolyte inflow portion for allowing the electrolyte to flow into the container;
A gas outflow part for allowing gas to flow out of the container,
At least one of the container body and the lid is
Have at least part of the state information detection unit for detecting the state information of the positive electrode current collecting portion or the negative electrode current collecting portion,
The status information detected by the status information detector is
Information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer,
The state information detector
Evaluation jig battery characterized by have a displacement amount measuring unit for measuring the displacement amount of said pressurized by the current collector pressing member positive electrode current collecting portion or the negative electrode current collecting portion. A positive electrode current collector portion on which a positive electrode mixture layer is formed;
A negative electrode current collector portion on which a negative electrode mixture layer is formed;
A container body provided with at least one of the positive electrode current collector and the negative electrode current collector;
A lid covering the opening of the container;
A sealing member for sealing a gap between the container and the lid;
An electrolyte inflow portion for allowing the electrolyte to flow into the container;
A gas outflow part for allowing gas to flow out of the container,
At least one of the container body and the lid is
Have at least part of the state information detection unit for detecting the state information of the positive electrode current collecting portion or the negative electrode current collecting portion,
The status information detected by the status information detector is
Information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer,
The state information detector
The positive electrode current collector or the evaluation jig battery characterized by have a pressure measuring unit for measuring the surface pressure acting on the negative electrode current collecting portion. A positive electrode current collector portion on which a positive electrode mixture layer is formed;
A negative electrode current collector portion on which a negative electrode mixture layer is formed;
A container body provided with at least one of the positive electrode current collector and the negative electrode current collector;
A lid covering the opening of the container;
A sealing member for sealing a gap between the container and the lid;
An electrolyte inflow portion for allowing the electrolyte to flow into the container;
A gas outflow part for allowing gas to flow out of the container,
At least one of the container body and the lid is
Have at least part of the state information detection unit for detecting the state information of the positive electrode current collecting portion or the negative electrode current collecting portion,
The status information detected by the status information detector is
Information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer,
The state information detector
Wherein together it is arranged at a position outside the positive electrode current collecting portion or the negative electrode current collecting portion, evaluation jig battery, characterized by chromatic infrared transmitting member that transmits infrared of the container. A positive electrode current collector portion on which a positive electrode mixture layer is formed;
A negative electrode current collector portion on which a negative electrode mixture layer is formed;
A container body provided with at least one of the positive electrode current collector and the negative electrode current collector;
A lid covering the opening of the container;
A sealing member for sealing a gap between the container and the lid;
An electrolyte inflow portion for allowing the electrolyte to flow into the container;
A gas outflow part for allowing gas to flow out of the container,
At least one of the container body and the lid is
Have at least part of the state information detection unit for detecting the state information of the positive electrode current collecting portion or the negative electrode current collecting portion,
The status information detected by the status information detector is
Information that changes due to an electrode reaction occurring inside the positive electrode mixture layer or the negative electrode mixture layer,
The state information detector
Evaluation jig battery characterized by have a AE wave detection unit for detecting an acoustic emission (AE) waves generated within the positive-electrode mixture layer or the negative-electrode mixture layer. A battery evaluation jig according to any one of claims 1 to 4 , comprising:
The electrolyte inflow portion is
A check valve that allows fluid to flow in a direction toward the interior of the container body;
The gas outflow part is
A battery evaluation jig, which is a check valve that allows a fluid to flow in a direction toward the outside of the container body. A battery evaluation jig according to any one of claims 1 to 5 ,
The lid is
A battery evaluation jig, which is movable along the inner wall of the container body. One of the positive electrode coating liquid and the negative electrode coating liquid is supplied to the container to form a first paste layer, a separator is placed on the first paste layer, and the positive electrode coating liquid is placed on the separator. A paste lamination step of supplying the other of the working liquid and the negative electrode coating liquid to form a laminate as a second paste layer;
A solvent volatilization step of creating a laminated electrode body by volatilizing the solvent contained in the first paste layer and the second paste layer by depressurizing the inside of the container;
An electrolyte injection step of injecting an electrolyte into the container to form an evaluation battery in the container;
Wherein while performing the charge and discharge test battery, possess a reaction state detection step of detecting the reaction state detection unit at least one of the reaction conditions of the negative-electrode mixture layer and the positive-electrode mixture layer,
The reaction state detected in the reaction state detection step is:
And the temperature of the mixture layer or the negative-electrode mixture layer, and the surface pressure distribution, and the displacement amount in the thickness direction, the evaluation method of the battery, wherein Der Rukoto least one or more of an AE wave. The battery evaluation method according to claim 7 , comprising:
After the electrolyte injection step,
A method for evaluating a battery, comprising a step of impregnating an electrolytic solution by depressurizing the inside of the container and impregnating the separator with an electrolytic solution.

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