JP2014017196A - Laminate selection device, control method of laminate selection device, battery manufacturing system, control program, and computer readable recording medium with control program recorded thereon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve, with high accuracy, a constant discharge capacity among a plurality of batteries.SOLUTION: Batteries are formed by inserting, into battery cans, a plurality of laminates each having a positive electrode and a negative electrode laminated via a separator. A laminate selection device 4 selects which of the laminates to be inserted into the battery cans. The laminate selection device has selection means for selecting the plurality of laminates inserted into the battery cans in such a manner that a total weight of the plurality of laminates may be substantially constant among the plurality of battery cans.

Description

  The present invention relates to a laminated body selection apparatus for selecting a plurality of laminated bodies to be inserted into a battery can in a battery manufacturing process in which a plurality of laminated bodies are inserted into a battery can.

  Generally, a secondary battery in which a plurality of laminates are inserted into a battery can is a laminate in which film- or sheet-like positive electrodes and negative electrodes are alternately combined via film- or sheet-like separators. After being bundled into a plurality of bundles and inserted into a battery can, it is manufactured by a manufacturing process in which an electrolytic solution is injected into the battery can. In such a secondary battery, the variation in the weight of the laminated body results in the stability of the performance of the secondary battery after completion (cycle life fluctuation, safety during gas generation due to rapid charging, and discharge capacity, etc.). It has been pointed out that it has an influence.

  Techniques for solving this problem are disclosed in, for example, Patent Documents 1 and 2.

  In Patent Document 1, each of the positive electrode and the negative electrode is divided into groups of two or more stages by weight, and when one group is selected from the two or more groups, those belonging to the minimum stage group and belong to the maximum stage. A configuration is described in which an electrode group is manufactured using positive and negative electrodes of the combined group so that the objects are not combined.

  Further, in Patent Document 2, when a single plate is cut from a large plate from which a plurality of single plates of the electrode plate forming the electrode plate group can be collected, each single plate is combined with a different arrangement location on the large plate. It is described that the stacked single plates are sequentially taken out and alternately stacked with single plates of other polar plate plates to form a plate group.

Japanese Patent Laid-Open No. 11-154531 (released on June 8, 1999) JP 2002-184450 A (published on June 28, 2002)

  However, as in Patent Document 1, the process of measuring the weight in units of a single plate and producing an electrode group based on the measurement result is complicated.

  In addition, as a problem common to Patent Documents 1 and 2, weight management in units of single plates cannot prevent fluctuations in battery performance due to elements intervening after single plate manufacture in the battery manufacturing process, There is a point that the effect (battery performance stability) obtained for complicated processing is low.

  The present invention has been made in view of the above-described problems, and its purpose is to provide a laminate selection device or the like that makes the discharge capacity of a battery constant with high accuracy among a plurality of batteries without complicated processing. Is to provide.

  In order to solve the above-mentioned problems, a laminate selection apparatus according to the present invention is provided in a battery can of a battery in which a plurality of laminates are inserted into a battery can, in which a positive electrode and a negative electrode are laminated via a separator. A stacked body selection apparatus for selecting a stacked body to be inserted, wherein a plurality of stacked bodies to be inserted into one of the battery cans has a total weight of the plurality of stacked bodies substantially constant among the plurality of battery cans. It is characterized by comprising selection means for making selections.

  In addition, the method for controlling the laminate selection apparatus according to the present invention includes a battery in which a plurality of laminates are inserted into a battery can in which a positive electrode and a negative electrode are laminated via a separator, and the laminate to be inserted into the battery can. A method for controlling a stacked body selecting apparatus for selecting a body, wherein a plurality of stacked bodies inserted into one battery can are configured such that a total weight of the plurality of stacked bodies is substantially constant among the plurality of battery cans. It includes the selection step to select as follows.

  According to the above configuration, the stacked body selection device selects the plurality of stacked bodies based on the weight of the stacked body so that the total weight of the plurality of stacked bodies inserted into one battery can is substantially constant.

  Thereby, since there is a strong correlation between the total weight of the plurality of laminated bodies and the discharge capacity of the battery, the discharge capacity is substantially constant among the plurality of batteries without performing discharge capacity measurement involving complicated processing. be able to.

  In addition, since the weight is adjusted in units of laminates, it is possible to reduce the complexity, time, and cost of processing required to make the discharge capacity constant as compared with the weight adjustment in units of single plates. In addition, since the change in the total weight of the plurality of laminates is less when the weight adjustment is performed downstream of the manufacturing process, the discharge capacity can be made constant with high accuracy compared with the weight adjustment in a single plate unit. it can.

  Accordingly, the discharge capacity can be made constant between the plurality of batteries without complicated processing, and for example, it is easy to manufacture a plurality of batteries having a constant discharge capacity according to a desired specification. can do.

  Also, if the total weight of the multiple laminates is the same, variations in the amount of electrolyte to be injected into the battery can can be suppressed, so there is no need to prepare an amount of electrolyte that guarantees variation, and the amount of electrolyte used Can be suppressed. Thereby, the manufacturing cost of a battery can be reduced.

  Furthermore, in the laminate selection apparatus according to the present invention, the selection means may select the plurality of laminates from laminates manufactured as the same production lot.

  Here, as shown in FIG. 7, the correlation between the total weight of the plurality of stacked bodies and the discharge capacity tends to be particularly strong within the same production lot corresponding to one dashed ellipse. Observed. FIG. 7 is an experimental result showing the relationship between the total weight of the laminated body and the discharge capacity for two laminated body production lots (range surrounded by broken-line ellipses), and the horizontal axis of the graph represents a plurality of laminated bodies. The total weight is shown on the vertical axis, and the discharge capacity is shown on the vertical axis.

  Therefore, according to the above configuration, the laminate selection device keeps the total weight of a plurality of laminates manufactured in the same lot, thereby suppressing variation in discharge capacity corresponding to the total weight. be able to. Therefore, the discharge capacity can be made constant between the plurality of batteries with higher accuracy.

  Furthermore, in the laminate selection device according to the present invention, the laminate is configured to divide the weight of the laminate into a plurality of layers according to the weight of the laminate, and to store a plurality of stockers of stockers assigned to each layer. And the selection means sets the storage part of the stocker so that the sum of the representative values of the weights included in the layer assigned to the storage part of the stocker is substantially constant between the battery cans. You may choose.

  According to the above configuration, the selection unit sets the total weight of the representative values of the weights included in the layer assigned to the storage unit in which the stack to be selected is stored as the total weight of the plurality of stacks, and this is constant. Thus, a some laminated body is selected from the stocker provided with this accommodating part.

  As a result, the stack selection device can easily keep the total weight of the plurality of stacks constant based on the weight associated with the accommodating portion to which the stack is distributed without referring to the weight of each stack. Can keep.

  Furthermore, the laminate selection device according to the present invention includes a reference value determining means for determining a total weight reference value based on a desired discharge capacity of the battery, and a weight included in a layer assigned to the storage portion of the stocker. Combination determining means for determining a combination of the storage portions of the stocker so that the total of the representative values becomes the total weight reference value.

  According to the above-described configuration, the selection unit is configured to determine the storage unit in which the stack to be selected is stored such that the total weight is a total weight reference value determined based on a desired discharge capacity of the battery. Select based on body combination.

  As a result, the laminate selection device can set the plurality of laminates to a preferred weight as the total weight of the plurality of laminates to be inserted into the battery can according to the discharge capacity defined in the specifications of the battery to be manufactured. Can keep the total weight of.

  Accordingly, the discharge capacity can be made constant among a plurality of batteries having the same specification in accordance with the specifications of the battery.

  The battery manufacturing system according to the present invention is a battery manufacturing system for selecting and combining a laminated body to be inserted into a battery can formed by inserting a plurality of laminated bodies, and measuring the weight of the laminated body. And a sorting device that divides the weight of the laminate into a plurality of layers according to the weight of the laminate and stores the laminate in any of a plurality of storage units of stockers assigned to each layer. A stacked body selection device that selects the stocker housing portion so that a total of the weights included in the layer assigned to the stocker housing portion is substantially constant among the battery cans, and the laminate body And a laminate assembly apparatus that combines the plurality of laminates acquired from the storage unit of the stocker selected by the selection device.

  According to the above configuration, the laminate is divided into a plurality of layers according to the weight of the laminate, and stored in one of the plurality of stockers of the stocker assigned to each layer. . Then, the stacked body selection device selects the stocker accommodating portion so that the total of the representative values of the weights included in the layer assigned to the stocker accommodating portion is substantially constant between the battery cans. And the some laminated body acquired from the accommodating part of the selected said stocker is combined by the laminated body assembly apparatus.

  Thereby, the battery manufacturing system can select and combine the plurality of stacked bodies so that the total weight of the plurality of stacked bodies inserted into one battery can becomes substantially constant by acquiring the stacked bodies. it can.

  Therefore, by inserting the combined laminate into a battery can, the discharge capacity can be made constant between a plurality of batteries with high accuracy.

  The laminate selection device may be realized by a computer. In this case, the laminate selection device is controlled by causing the computer to realize the laminate selection device by operating the computer as each of the means. A program and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.

  As described above, the laminate selection device according to the present invention is a laminate selection device that selects a laminate to be inserted into a battery can in which a plurality of laminates are inserted, and is inserted into one battery can. It is the structure provided with the selection means which selects a some laminated body so that the total weight of this some laminated body may become fixed among the said some battery can.

  Also, a control method for a laminate selection apparatus according to the present invention is a control method for a laminate selection apparatus that selects a laminate to be inserted into a battery can in which a plurality of laminates are inserted. The method includes a selection step of selecting a plurality of stacked bodies to be inserted into the can so that a total weight of the plurality of stacked bodies is constant among the plurality of battery cans.

  Thereby, it is possible to make the discharge capacity constant between the plurality of batteries with high accuracy without complicated processing.

It is a block diagram which shows the structure of the battery manufacturing system containing the laminated body selection apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows the flow of the whole process which the battery manufacturing system shown in FIG. 1 performs. (A) is a disassembled perspective view which shows the structural example of the laminated body which the battery manufacturing system shown in FIG. 1 handles, (b) is sectional drawing of the battery can in which the said laminated body was inserted in multiple numbers. 2 is a correspondence table showing a correspondence relationship between a plurality of shelves included in the laminate storage stocker included in the battery manufacturing system shown in FIG. 1 and a reference label indicating the weight range of the laminate. It is a flowchart which shows the flow of the process which the laminated body selection apparatus with which the battery manufacturing system shown in FIG. It is an experimental result which shows the total weight of a several laminated body, and the discharge capacity of the battery manufactured by inserting this several laminated body. It is an experimental result which shows the relationship between the total weight of a laminated body, and discharge capacity about two laminated body manufacturing lots. It is a figure which shows the outline of the preparation process of the electrode contained in the laminated body with which a general secondary battery is equipped.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, this invention is not limited to the following description.

[Outline of Battery Manufacturing System 100 and Laminate Selection Device 4]
The battery manufacturing system 100 (see FIG. 1) according to the present embodiment measures the weight of the laminated body 300 (see FIG. 3), sorts the laminated bodies 300 based on the measurement results, and stores them in the stocker. Then, the plurality of stacked bodies 300 are selected and acquired from the stocker so that the total weight of the plurality of stacked bodies 300 is constant, and the selected and acquired multiple stacked bodies 300 are combined.

  In addition, the stacked body selection device 4 according to the present embodiment selects a plurality of stacked bodies 300 that are measured for weight in the battery manufacturing system 100 and distributed and stored in the stocker based on the measured weight. At this time, the stacked body selection device 4 selects the multiple stacked bodies 300 such that the total weight of the multiple stacked bodies 300 is constant.

  Here, as shown in FIG. 6, it has been experimentally observed that the discharge capacity of the battery has a strong correlation with the total weight of the plurality of stacked bodies 300 inserted into the battery can 340 (see FIG. 3). Yes. FIG. 6 is an experimental result showing the total weight of a plurality of laminated bodies 300 and the discharge capacity of a battery manufactured by inserting the plurality of laminated bodies 300. The horizontal axis of the graph is inserted into one battery. The vertical axis represents the total capacity of the plurality of stacked bodies 300, and the vertical axis represents the discharge capacity of the battery.

  The above-described configuration of the multilayer body selection device 4 utilizes the above-described correlation between the discharge capacity and the total weight of the plurality of multilayer bodies 300, and aims to make the discharge capacity of the battery constant by the above-described configuration. .

  Furthermore, as shown in FIG. 7, the correlation between the total weight of the plurality of stacked bodies and the discharge capacity tends to be particularly strong within the same lot.

  Based on the above tendency, the laminate selection device 4 keeps the total weight of the laminates 300 manufactured in the same lot substantially constant. Thereby, the variation in the discharge capacity corresponding to the total weight can be suppressed. Therefore, the discharge capacity can be made constant between the plurality of batteries with higher accuracy.

[About Structure of Laminate 300]
Below, with reference to FIG. 3, the structure of the laminated body 300 inserted in the battery can 340 with which the lithium ion secondary battery in this embodiment is provided is demonstrated.

  In the present embodiment, as an example, each element is described as a battery manufactured by the battery manufacturing system 100 as a lithium ion secondary battery having a square shape. However, the battery can 340 only needs to accommodate a plurality of stacked bodies, and the shape thereof is not limited to a square shape, and may be a cylindrical shape. Further, in the following description, materials suitable for the lithium ion secondary battery are exemplified as the internal structure of the battery can 340 and the materials that can be used for each element included in the battery can 340. It should be understood that the ions in the liquid are different and that the material should be modified accordingly.

  As shown in FIG. 3A, the laminated body 300 is obtained by alternately superposing positive electrodes 310 and negative electrodes 320 with separators 330 interposed therebetween. The structure may include only one set of positive and negative electrodes, or may include a plurality. FIG. 3A is an exploded perspective view showing the stacked body 300 in the lithium ion secondary battery in a state where the positive electrode 310, the negative electrode 320, and the separator 330 are separated. In the same figure, the laminated body 300 containing 1 set of positive and negative electrodes is shown for simplification of description.

  The positive electrode 310 is an electrode plate that causes a reduction reaction when it comes into contact with an electrolytic solution poured into the battery can 340 (see FIG. 3B). The positive electrode 310 includes a positive electrode current collector 311 and two positive electrode active material layers 312 sandwiching the positive electrode current collector 311.

  The positive electrode current collector 311 collects current from the positive electrode active material layer 312. The positive electrode current collector 311 is a conductive substrate made of a material that is chemically stable with respect to the electrolyte and the material in the positive electrode active material layer 312. The material constituting the positive electrode current collector 311 may be, for example, a metal foil such as aluminum, titanium, stainless steel, nickel, or iron. The shape of the positive electrode current collector 311 is not limited to a foil shape, and is a film shape, a sheet shape, a net shape, a punched or expanded shape, a lath body, a porous body, a foamed body, or a formed body of fiber groups. Etc.

The positive electrode active material layer 312 is a layer containing a positive electrode active material that can occlude and release ions in the electrolytic solution. Specifically, the positive electrode active material is LiCoO ₂ , LiFeO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , a compound in which a transition metal in these metal oxides is partially substituted with another metal element, or the like. Also good. The positive electrode active material layer 312 may include an auxiliary material, a thickener, a binder, and the like in addition to the positive electrode active material. Further, as shown in FIG. 8, even if the electrode paste obtained by kneading these with the positive electrode active material is applied onto the positive electrode current collector 311, and dried, pressed and cut, the positive electrode 310 is formed. Good. FIG. 8 is a diagram illustrating an outline of a manufacturing process of an electrode included in a laminated body included in a general secondary battery.

  The negative electrode 320 is an electrode plate that causes an oxidation reaction when brought into contact with an electrolyte solution poured into the battery can 340. The negative electrode 320 includes a negative electrode current collector 321 and two negative electrode active material layers 322 sandwiching the negative electrode current collector 321.

  The negative electrode current collector 321 collects current from the negative electrode active material layer 322. The negative electrode current collector 321 is a conductive substrate made of a material that is stable with respect to the substance in the electrolytic solution. The material constituting the negative electrode current collector 321 may be a metal foil such as copper, nickel, stainless steel, iron, or a nickel plating layer. The shape of the negative electrode current collector 321 is not limited to a foil shape, and is a film shape, a sheet shape, a net shape, a punched or expanded shape, a lath body, a porous body, a foamed body, or a formed body of fiber groups. Etc.

  The negative electrode active material layer 322 is a layer containing a negative electrode active material that can occlude and release ions in the electrolytic solution. Specifically, the negative electrode active material may be particulate natural graphite or artificial graphite. The positive electrode active material layer 312 may include an auxiliary material, a thickener, a binder, and the like in addition to the positive electrode active material. Further, as shown in FIG. 8, even if the electrode paste obtained by kneading these with the positive electrode active material is applied onto the positive electrode current collector 311, and dried, pressed and cut, the positive electrode 310 is formed. Good.

  The separator 330 separates the positive electrode 310 and the negative electrode 320 and holds the electrolytic solution to ensure ionic conductivity between the positive electrode 310 and the negative electrode 320. Separator 330 may be a microporous film or a nonwoven fabric containing polyethylene, polypropylene, or ethylene-propylene copolymer.

  FIG. 3B is a cross-sectional view of the battery can 340 in which a plurality of the stacked bodies 300 shown in FIG. In the figure, the laminated body 300 is inserted into four battery cans 340. Since each positive and negative electrode needs to be separated from the battery can 340 by the separator 330, the separator 330 is inserted between the inner surface of the battery can 340 and the surface of the outermost electrode.

  3A and 3B show the structure of the stacked body 300 in a rectangular battery, but in a cylindrical battery, a plurality of stacked bodies 300 are wound and inserted into a battery can. It becomes. In this case, the shapes (rectangular width and height) of the positive electrode 310, the negative electrode 320, and the separator 330 included in each stacked body 300 are appropriately changed.

  The battery can 340 includes a plurality of laminates 300 and forms the outer shape of a lithium ion battery. The battery can 340 may be formed of a metal plate such as iron, stainless steel, or aluminum, or a steel plate obtained by applying nickel plating or aluminum plating to iron.

  In addition, the lithium ion secondary battery is an element that is generally provided in the secondary battery, such as a liquid injection port, a sealing plate, a positive electrode terminal, a negative electrode terminal, a gas discharge valve, a positive electrode tab, a negative electrode tab, and a gasket (not shown). May be provided.

[Configuration of Battery Manufacturing System 100]
FIG. 1 is a block diagram showing a main configuration of a battery manufacturing system 100 including a laminate selection device 4 according to the present embodiment.

  The battery manufacturing system 100 includes a laminate weight measuring device (weight measuring device) 1, a laminate distributing device (sorting device) 2, a laminate storage stocker (stocker) 3, a laminate selecting device 4, and a laminate assembling device 5. It is prepared for.

  The stacked body weight measuring apparatus 1 measures the weight of the stacked body 300. Specifically, the laminate weight measuring device 1 measures the weight of each laminate 300 and notifies the laminate distribution device 2 of the measurement result.

  The laminate distribution device 2 distributes the laminate 300 to the shelves 31 to 38 provided in the laminate storage stocker 3 based on the measurement result of the laminate weight measuring device 1. Details of the distribution process will be described later.

  The stack storage stocker 3 stores the stack 300 distributed by the stack distribution device 2. The laminate storage stocker 3 includes shelves 31 to 38 assigned to the respective layers when the weight of the laminate 300 is divided into a plurality of layers. The shelves 31 to 38 each have one representative value, such as the median value of the weight range corresponding to the hierarchy, as reference labels, and the reference labels are stored in the shelves 31 to 38 by the combination determination unit 42 described later. Referenced when determining combinations. The representative value of 1 may be, for example, the median value of the weight range. The number of shelves is not limited to eight, and can be arbitrarily set as long as it is two or more. However, in order to support a plurality of electrode standards, it is preferable that the number of the above-mentioned layers is large. The stacked body storage stocker 3 is configured to store the stacked body 300 remaining in the shelves 31 to 38 before the stacked body 300 manufactured by the new production lot is distributed to the shelves 31 to 38 and stored. It is preferable that the shelves 31 to 38 are emptied, for example, by being moved to the outside. With this configuration, it is possible to suppress variations in the discharge capacity of the lithium ion secondary battery due to variations in the weight of the laminate 300 between different production lots.

  With reference to FIG. 4, an example of a correspondence relationship between each of the shelves 31 to 38, the predetermined weight range, and a reference label indicating the weight range is shown. Each of the shelves 31 to 38 is set with a lower limit value a and an upper limit value A of the weight range associated with the shelf, and the reference label of each shelf indicates the median value of the weight range.

  Here, the distribution of the laminated body 300 by the laminated body distribution apparatus 2 will be specifically described. The laminated body distribution device 2 is the lower limit of the weight range (referred to as w) of each laminated body 300 indicated by the measurement result by the laminated body weight measuring device 1 and the weight range associated with each of the shelves 31 to 38 illustrated in FIG. With reference to the value a and the upper limit value A, the laminated body 300 is distributed to a shelf associated with a weight range to which the weight of the laminated body 300 belongs, that is, a shelf satisfying a ≦ w <A. For example, if the measurement result that the weight of a certain laminated body 300 is 2570 g is notified from the laminated body weight measuring apparatus 1, the laminated body distributing apparatus 2 places the laminated body on the shelf 34 that satisfies a ≦ 2570 <A. Sort 300. The distributed stack 300 is stored in each shelf of the stack storage stocker 3 until it is selected by the stack selection device 4.

  The stacked body selection device 4 selects and acquires the multiple stacked bodies 300 from the stacked body storage stocker 3 so that the total weight of the multiple stacked bodies 300 is constant. Specifically, the multilayer body selection device 4 is configured so that the total weight of the plurality of multilayer bodies 300 to be inserted into the battery can 340 is a weight determined based on a desired discharge capacity of the lithium ion secondary battery. The plurality of stacked bodies 300 are selected so as to have a value. As illustrated in FIG. 1, the stacked body selection device 4 includes a control unit (selection unit) 40.

  The control unit 40 controls functions of the respective units included in the multilayer body selection device 4 and controls driving of the multilayer body selection device 4. In the present embodiment, in particular, a selection process for a plurality of stacked bodies 300 is performed. The control unit 40 is realized by, for example, a CPU (central processing unit) or the like, and the function of the stacked body selection device 4 is such that the CPU as the control unit 40 reads a program stored in the ROM or the like to the RAM or the like. It is realized by executing. As shown in FIG. 1, the control unit 40 includes, as functional blocks, a reference value determining unit (reference value determining unit) 41, a combination determining unit (combination determining unit) 42, and a capacity / weight correspondence DB 43. Yes.

  The reference value determination unit 41 determines a total weight reference value. Specifically, the reference value determining unit 41 acquires information indicating the correspondence between the discharge capacity of the lithium ion secondary battery and the total weight of the plurality of stacked bodies 300 from the capacity / weight correspondence DB 43. Then, the discharge capacity according to the standard of the lithium ion secondary battery manufactured by the battery manufacturing system 100 is referred to, and the total weight of the plurality of stacked bodies 300 associated with this in the capacity / weight correspondence DB 43 is expressed as the total weight. Determine as the reference value.

  The combination determination unit 42 determines a combination of the plurality of stacked bodies 300. Specifically, the combination determining unit 42 stores the stack 300 to be selected so that the total weight of the plurality of stacked bodies 300 to be selected becomes the total weight reference value determined by the reference value determining unit 41. A combination of shelves 31 to 38 is determined. More specifically, the one representative value of the weight range associated with each of the shelves 31 to 38 is referred to as a reference label, and the sum of the representative values becomes the total weight reference value. One or a plurality of shelves from which the stack 300 is obtained are determined.

  Regarding a lithium ion secondary battery in which four laminated bodies 300 are inserted into a battery can 340, which describes an example of a method for determining one or more shelves, the discharge capacity according to the standard of the lithium ion secondary battery Assume that the total weight reference value is 10290 g. At this time, the combination determination unit 42 sets, for example, the shelves 31, 33, 34, and 38 as shelves from which the stacked body 300 is acquired so that the total value of the reference label values is 10290 for the shelves 31 to 38. decide. When the shelf as the acquisition source is determined, the stacked body 300 may be acquired from each of the shelves by an arm or the like (not shown) included in the stacked body selecting device 4.

  In addition, the combination determination unit 42 may determine one or a plurality of shelves so that the total of the representative values falls within a predetermined allowable range centered on the total weight reference value. For example, when the variation in the weights of the stacked bodies 300 is ± 5%, if the allowable range is set to ± 2.5%, the variation in the total weight of the plurality of stacked bodies 300 is changed to the variation in each stacked body 300. Can be reduced to half. By providing a predetermined allowable range as described above, it is possible to ensure a certain quality for the discharge capacity while enabling flexible selection of one or more shelves from which the laminate 300 is obtained.

  The capacity / weight correspondence DB 43 is a database that stores information indicating a correspondence relation between the discharge capacity of the lithium ion secondary battery and the total weight of the plurality of stacked bodies 300. Specifically, the discharge capacity according to a predetermined standard of the lithium ion secondary battery and the total weight of the plurality of stacked bodies 300 are stored in association with each other. The reference value determination unit 41 can determine the total weight reference value that realizes the discharge capacity of the standard when the lithium ion secondary battery of the standard is manufactured by referring to the capacity / weight correspondence DB 43. it can. In the capacity-weight correspondence DB 43, for each manufacturing lot of the laminated body 300, a value of 1 indicating the total weight of the plurality of laminated bodies 300 is stored in association with a predetermined discharge capacity. Good. Specifically, a total of a plurality of laminates 300 inserted into a battery can 340, which was generated in advance using some of the laminates 300 extracted from the same electrode production lot and measured for the batteries, was obtained. It is preferable that the weight and the discharge capacity are stored in the capacity / weight correspondence DB 43 in association with each other. Thereby, in the manufacture of a battery using the laminate 300, the weight measurement of the laminate 300 is performed without measuring the discharge capacity of the battery except for the battery using the partial laminate 300 for data acquisition. Only by this, the discharge capacity can be made constant with high accuracy.

  The laminated body assembly apparatus 5 combines a plurality of laminated bodies 300 selected and acquired by the laminated body selection apparatus 4. Specifically, the multilayer body assembling apparatus 5 superimposes the number of the multilayer bodies 300 according to the specifications of the battery, and confirms the presence or absence of a defect such as a short circuit in a state where a predetermined weight is placed. If there is no defect, the plurality of stacked bodies 300 are fixed while being superposed. The plurality of fixed laminated bodies 300 are conveyed to a can insertion device (not shown) that inserts into the battery can 340.

[Processing flow in battery manufacturing system 100]
With reference to FIGS. 2 and 3, an example of the flow of processing in the battery manufacturing system 100 will be described. FIG. 2 is a flowchart showing a flow of a series of processes including weight measurement, distribution, storage, selection and acquisition, and combination of the stacked body 300 in the battery manufacturing system 100.

  In addition, it is preferable that this flowchart starts when the single laminated body 300 including the positive electrode 310, the negative electrode 320, and the separator 330 is supplied to the laminated body weight measuring apparatus 1. Further, the processing according to this flowchart is performed on the stacked body 300 manufactured in the same manufacturing lot.

  First, the laminate weight measuring apparatus 1 measures the weight of the laminate 300 (S201). Specifically, the weights of the laminates 300 manufactured in the same manufacturing lot are measured. The measurement result is notified to the laminate distribution device 2.

  Next, the laminated body distribution apparatus 2 distributes the laminated body 300 based on the weight (S202). Specifically, the stack distribution device 2 includes the weight w of each stack 300 indicated by the measurement result of the stack weight measuring device 1 and the weight ranges associated with the shelves 31 to 38 illustrated in FIG. Referring to the lower limit value a and the upper limit value A, the laminated body 300 is distributed to shelves that satisfy a ≦ w <A.

  Subsequently, the laminate storage stocker 3 stores the laminate 300 (S203). Specifically, the stacked body storage stocker 3 stores the stacked body 300 in the shelves 31 to 38 in accordance with the above distribution of the stacked body distribution device 2. The stacked body 300 stored in the shelves 31 to 38 is stored until it is selected and acquired by the stacked body selecting device 4.

  Next, the stacked body selection device 4 selects and acquires a plurality of stacked bodies 300 (S204: selection step).

  Here, the detailed flow of the process in step S204 will be described with reference to FIG. FIG. 5 is a flowchart showing a detailed flow of processing related to selection and acquisition of a plurality of stacked bodies 300 by the stacked body selecting apparatus 4.

  First, the reference value determination unit 41 determines the discharge capacity (S501). Specifically, the reference value determination unit 41 acquires battery standard information set by the administrator of the battery manufacturing system 100 and determines the discharge capacity according to the standard.

  Next, the reference value determination unit 41 determines the total weight reference value (S502). Specifically, the reference value determination unit 41 acquires information indicating the correspondence between the discharge capacity and the total weight of the plurality of stacked bodies 300 from the capacity / weight correspondence DB 43, and the discharge capacity determined in step S501. Is determined as the total weight reference value. The determined total weight reference value is notified to the combination determining unit 42.

  Next, the combination determination part 42 determines the combination of the some laminated body 300 (S503). Specifically, the combination determination unit 42 calculates the total of the values of the reference labels (see FIG. 4) indicating the representative values of the weight ranges associated with the shelves 31 to 38 in step S502. One or a plurality of shelves from which the laminate 300 is obtained are determined so as to be the weight reference value.

  Next, the stacked body selection device 4 acquires a plurality of stacked bodies 300 (S504). Specifically, the laminate selection device 4 acquires the laminate 300 from each of the shelves determined in step S503 among the shelves 31 to 38 included in the laminate storage stocker 3 by an arm or the like (not shown).

  With the above processing, the processing in step S204 shown in FIG. 2 is completed, and the process proceeds to step S205.

  Subsequently, the stacked body assembly apparatus 5 combines a plurality of stacked bodies 300 (S205). Specifically, the laminate assembly apparatus 5 combines the plurality of laminates 300 selected and acquired by the laminate selection apparatus 4 in step S <b> 204 so as to be inserted into the battery can 340.

[Configuration and effect]
As described above, the stacked body selection device 4 according to the present embodiment is configured to select a plurality of stacked bodies 300 distributed based on the weight so that the total weight of the multiple stacked bodies 300 is substantially constant. .

  Thereby, since there is a strong correlation between the discharge capacity and the total weight of the plurality of stacked bodies 300, the discharge capacity can be made constant between the plurality of batteries with high accuracy.

  Moreover, since the variation in the amount of the electrolyte to be injected into the battery can 340 can be suppressed by making the total weight of the plurality of laminates 300 substantially constant, there is no need to prepare an amount of the electrolyte that ensures the variation. The amount of electrolyte used can be suppressed. Thereby, the manufacturing cost of a battery can be reduced.

  In addition, the stack selection device 4 can select a plurality of stacks 300 from the stacks 300 manufactured as the same manufacturing lot, thereby making the discharge capacity constant between the plurality of batteries with higher accuracy. it can.

  Furthermore, the stack selection device 4 assigns the stacks 300 stored in the shelves 31 to 38 assigned to the respective levels to the shelves 31 to 38 when the weight of the stack 300 is divided into a plurality of levels. The shelves 31 to 38 are selected so that the sum of the representative values of the weights included in the given hierarchy is substantially constant among the plurality of battery cans 340.

  Accordingly, the total weight of the plurality of stacked bodies can be easily kept constant without referring to the weight of each stacked body 300.

  Further, the laminate selection device 4 determines the total weight of the plurality of laminates 300 corresponding to the discharge capacity according to the standard of the predetermined battery as the total weight reference value, and the total weight of the plurality of laminates 300 is the total weight. The combination of shelves from which the laminate 300 is obtained is determined so as to be the weight reference value.

  As a result, the discharge capacity can be made constant among a plurality of batteries having the same specification in accordance with the specifications of the battery.

  In addition, the battery manufacturing system 100 according to the present embodiment measures the weight of the stacked body 300, and based on the measurement result, each layer when the weight of the stacked body 300 is divided into a plurality of levels. So that the sum of the representative values of the weights included in the layers assigned to the shelves 31 to 38 is substantially constant among the plurality of battery cans 340. In this configuration, 31 to 38 are selected and a plurality of laminated bodies 300 acquired from the selected shelves 31 to 38 are combined.

  Thereby, by inserting the combined laminated body 300 into the battery can, the discharge capacity can be made constant between the plurality of batteries with high accuracy.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed as different aspects are also included. It is included in the technical scope of the present invention.

[Example of software implementation]
Finally, each block of the stacked body selection device 4, particularly each block of the control unit 40, may be realized in hardware by a logic circuit formed on an integrated circuit (IC chip), or may be a CPU (Central Processing Unit). Unit) may be implemented in software.

  In the latter case, the stack selection device 4 includes a CPU that executes instructions of a program that realizes each function, a ROM (Read Only Memory) that stores the program, a RAM (Random Access Memory) that expands the program, and the program And a storage device (recording medium) such as a memory for storing various data. An object of the present invention is a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the laminate selection apparatus 4 which is software that realizes the above-described functions is recorded in a computer-readable manner. Can also be achieved by reading the program code recorded on the recording medium and executing it by the computer (or CPU or MPU).

  Examples of the recording medium include non-transitory tangible medium, such as magnetic tape and cassette tape, magnetic disk such as floppy (registered trademark) disk / hard disk, and CD-ROM / MO. Discs including optical discs such as / MD / DVD / CD-R, cards such as IC cards (including memory cards) / optical cards, semiconductor memories such as mask ROM / EPROM / EEPROM (registered trademark) / flash ROM Alternatively, logic circuits such as PLD (Programmable Logic Device) and FPGA (Field Programmable Gate Array) can be used.

  Alternatively, the stack selection device 4 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited as long as it can transmit the program code. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication network, and the like can be used. The transmission medium constituting the communication network may be any medium that can transmit the program code, and is not limited to a specific configuration or type. For example, even with wired lines such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line, infrared rays such as IrDA and remote control, Bluetooth (registered trademark), IEEE 802.11 wireless, HDR ( It can also be used by radio such as High Data Rate (NFC), Near Field Communication (NFC), Digital Living Network Alliance (DLNA), mobile phone network, satellite line, and digital terrestrial network. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  INDUSTRIAL APPLICABILITY The present invention can be used for a laminated body selection apparatus for selecting a laminated body to be inserted into a battery can in which a plurality of laminated bodies are inserted in a battery manufacturing process.

1 Laminate weight measuring device (weight measuring device)
2 Laminate sorting device (sorting device)
3 Laminate storage stocker (stocker)
4 Laminate Selection Device 5 Laminate Assembly Device 31, 32, 33, 34, 35, 36, 37, 38 Shelf (accommodating section)
40 Control unit (selection means)
41 Reference value determination unit (reference value determination means)
42 combination determination unit (combination determination means)
100 Battery Manufacturing System 300 Laminate 340 Battery Can S204 Selection Step

Claims (8)

A laminated body selection device for selecting a laminated body to be inserted into a battery can of a battery in which a positive electrode and a negative electrode are laminated via a separator and a plurality of laminated bodies are inserted into the battery can,
A laminate comprising selection means for selecting a plurality of laminates to be inserted into one battery can so that the total weight of the plurality of laminates is substantially constant among the plurality of battery cans. Selection device.   The said selection means selects the said several laminated body from the laminated body manufactured as the same manufacturing lot, The laminated body selection apparatus of Claim 1 characterized by the above-mentioned. The laminate is divided into a plurality of layers according to the weight of the laminate, and is stored in any of a plurality of stockers of stockers assigned to each layer,
The selection means selects the storage part of the stocker so that the sum of the representative values of the weights included in the layer assigned to the storage part of the stocker is substantially constant between the battery cans. The laminated body selection apparatus of Claim 1 or 2. A reference value determining means for determining a total weight reference value based on a desired discharge capacity of the battery;
A combination determination means for determining a combination of the storage units of the stocker so that a total of the representative values of the weights included in the layer assigned to the storage unit of the stocker becomes the total weight reference value;
The laminate selection apparatus according to claim 3, further comprising: A control method of a laminate selection apparatus for selecting a laminate to be inserted into a battery can of a battery in which a positive electrode and a negative electrode are laminated via a separator and a plurality of laminates are inserted into the battery can,
A laminate comprising a selection step of selecting a plurality of laminates to be inserted into one battery can so that the total weight of the plurality of laminates is substantially constant among the plurality of battery cans. Control method of selection device. A battery manufacturing system for selecting and combining a laminate to be inserted into a battery can formed by inserting a plurality of laminates,
A weight measuring device for measuring the weight of the laminate;
A sorting device that divides the weight of the laminate into a plurality of layers according to the weight of the laminate, and stores the laminate in one of a plurality of storage units of stockers assigned to each layer;
A laminate selection device that selects the stocker housing portion so that the total of the representative values of the weights included in the layer assigned to the stocker housing portion is substantially constant between the battery cans;
A battery assembly system comprising: a laminate assembly apparatus that combines the plurality of laminates acquired from the storage unit of the stocker selected by the laminate selection apparatus.   The control program for functioning a computer as said each means of the laminated body selection apparatus of any one of Claim 1 to 4.   A computer-readable recording medium on which the control program according to claim 7 is recorded.

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