JP2010086754A - Method for manufacturing battery - Google Patents

Abstract

A battery manufacturing method capable of shortening the time required for shipping inspection is provided.
In aging treatment of a thin battery 10 in which an electrode laminate in which a positive electrode plate 101 and a negative electrode plate 103 are alternately laminated via a separator 102 is accommodated and sealed in a battery exterior 106, 107 together with an electrolytic solution, The thin battery 10 is pressurized in the stacking direction of the positive electrode plate 101 and the negative electrode plate 103.
[Selection] Figure 4

Description

  The present invention relates to a battery manufacturing method.

  A method of manufacturing an alkaline storage battery is known in which after charging a battery just manufactured, the battery is left (aged) for a predetermined period of time at a high temperature of about 45 to 50 ° C. (Patent Document 1). The reason for aging the newly produced storage battery is to remove the initial deterioration of the battery and stabilize the battery performance.

JP 2003-77527 A

  However, in the conventional method described above, since aging is performed only in a high temperature environment, it is not possible to detect a storage battery that may cause a short-circuit in a short time, and the time required for shipping inspection is long. It was over.

  The problem to be solved by the invention is to provide a battery manufacturing method capable of shortening the time required for shipping inspection.

  The present invention solves the above problem by pressurizing the battery in the stacking direction of the positive electrode and the negative electrode inside the battery during the aging treatment.

  According to the above invention, since the battery is pressurized during aging, a battery that may cause a micro short circuit is detected in a short time, and as a result, the time required for the shipping inspection can be shortened.

  Hereinafter, embodiments of the invention will be described with reference to the drawings. In the following, a thin secondary battery (hereinafter simply referred to as “thin battery”) will be described as an example.

<Thin battery>
As shown in FIGS. 1 to 3, the thin battery 10 according to the present embodiment is a single unit battery, and an assembled battery having a desired voltage and capacity can be configured by stacking a plurality of the thin batteries 10. it can.

  The thin battery 10 according to this embodiment is a lithium-based thin secondary battery, and includes a battery element 100, battery sheaths 106 and 107, and electrode terminals 104 and 105.

  In the present embodiment, the battery element 100 includes three positive plates 101, seven separators 102, three negative plates 103, and an electrolyte (not shown). In addition, the number of the positive electrode plate 101, the separator 102, and the negative electrode plate 103 is not limited at all, and may be one positive electrode plate 101, three separators 102, and one negative electrode plate 103, and if necessary. The number of positive plates 101, negative plates 103, and separators 102 can also be selected.

The positive electrode plate 101 (positive electrode) includes a positive electrode side current collector 104a connected to the positive electrode terminal 104 via a positive electrode lead 104c, and a positive electrode layer 104b formed on both main surfaces of the positive electrode side current collector 104a. Including. The positive electrode layer 104b includes a positive electrode active material, a conductive additive, a binder, and the like. Examples of the positive electrode active material include lithium-transition metal composite oxides such as LiMn ₂ O ₄ . Examples of the conductive assistant include acetylene black, carbon black, graphite, carbon fiber, and carbon nanotube. Examples of the binder include polyvinylidene fluoride (PVDF), styrene butadiene rubber (SBR), and polyimide.

  The negative electrode plate 103 (negative electrode) includes a negative electrode side current collector 105a connected to the negative electrode terminal 105 via a negative electrode lead 105c, and a negative electrode layer 105b formed on both main surfaces of the negative electrode side current collector 105a. Including. The negative electrode layer 105b includes a negative electrode active material, a conductive additive, a binder, and the like. Examples of the negative electrode active material include graphite-based carbon material (graphite-based), hard carbon (non-graphitizable carbon material), lithium-transition metal composite oxide, and the like.

  The current collectors 104a and 105a are made of, for example, aluminum foil, copper foil, stainless steel foil, titanium foil, nickel-aluminum clad material, copper-aluminum clad material, stainless steel-aluminum clad material, or a combination of these metals. Consists of plating material. Of the above materials, a material that is stable at the positive electrode potential is selected for the positive electrode side current collector 104a and a negative electrode potential for the negative electrode side current collector 105a. In general, the positive electrode side current collector 104a is made of aluminum. As the foil, a copper foil is used for the negative electrode side current collector 105a. In this embodiment, both current collectors 104a and 105a are formed by extending the aluminum foil, nickel foil, and copper foil that constitute the current collectors of the positive electrode plate 101 and the negative electrode plate 103. The current collectors 104a and 105a can be formed of materials and parts.

  The separator 102 plays a role of holding an electrolyte, and is interposed between the positive electrode layer 104 b of the positive electrode plate 101 and the negative electrode layer 105 b of the negative electrode plate 103 in order to prevent the above-described short circuit between the positive electrode plate 101 and the negative electrode plate 103. Arranged. The separator 102 is a microporous film made of, for example, polyolefin such as polyethylene or polypropylene, polyamide, polyimide, and the like, and when an overcurrent flows, the separator 102 also has a function of blocking the current by closing the pores of the film due to heat generation. . The separator 102 is not limited to a single-layer film such as polyolefin, but a three-layer structure in which a polypropylene layer is sandwiched between polyethylene layers, or a laminate of a polyolefin microporous film and an organic nonwoven fabric can also be used. By forming the separator 102 in multiple layers, various functions such as an overcurrent prevention function, an electrolyte holding function, and a separator shape maintenance (rigidity improvement) function can be provided. In the present embodiment, the thickness of the separator 102 is equal to the distance between the positive electrode plate 101 and the negative electrode plate 103.

The electrolyte (electrolytic solution) held in the separator 102 is a liquid polymer or a fluid gel polymer, and includes, for example, an organic solvent, a supporting salt, and a small amount of a surfactant. Examples of the organic solvent include cyclic carbonates such as propylene carbonate (PC) and ethylene carbonate (EC), chain carbonates such as dimethyl carbonate, and ethers such as tetrahydrofuran. Examples of the supporting salt include inorganic acid anion salts such as lithium salt (LiPF ₆ ) and organic acid anion salts such as LiCF ₃ SO ₃ . The gel polymer electrolyte includes an electrolytic solution, a host polymer, and the like. As the host polymer, a polymer having no lithium ion conductivity, such as a copolymer of polyvinylidene fluoride and hexafluoropropylene (PVDF-HFP), PAN (polyacrylonitrile (PAN), PMMA (polymethyl methacrylate (PMMA)), Examples thereof include polymers (solid polymer electrolytes) having ion conductivity such as PEO (polyethylene oxide) and PPO (polypropylene oxide).

  The upper and lower battery exteriors 106 and 107 (exterior) accommodate and seal the battery element 100 therein. The upper and lower battery casings 106 and 107 are, for example, a resin film such as polyethylene or polypropylene, or an inner surface of a metal foil such as aluminum laminated with a resin such as polyethylene or polypropylene, and an outer surface such as a polyamide resin or a polyester resin. It can be comprised with the material which has softness | flexibility, such as a resin-metal thin film laminate material laminated | stacked by the above. In this embodiment, in particular, it is preferable to be made of a flexible material such as a resin-metal thin film laminate material. By configuring the battery casings 106 and 107 with a material having flexibility, the distance between the positive electrode plate 101 and the negative electrode plate 103 can be easily compressed during pressurization described later.

  The positive electrode terminal 104 is connected to the positive electrode plate 101 (positive electrode side current collector 104a) via a positive electrode lead 104c, and the negative electrode terminal 105 is connected to the negative electrode plate 103 (negative electrode side current collector) via a negative electrode lead 105c. 105a). Both terminals 104 and 105 are drawn from the inside of the upper and lower battery casings 106 and 107 to the outside in order to draw current from the battery element 100. The positive electrode terminal 104 and the negative electrode terminal 105 are not particularly limited as long as they are electrochemically stable metal materials. Examples of the positive electrode terminal 104 include aluminum and aluminum alloys, and examples of the negative electrode terminal 105 include nickel and copper. Or stainless steel etc. can be mentioned.

《Battery manufacturing method》
Next, an example of a method for manufacturing the above-described thin battery 10 will be described with reference to FIGS.

  (1) First, a positive electrode layer slurry that constitutes the positive electrode layer 104b and a negative electrode layer slurry that constitutes the negative electrode layer 105b are prepared (see S1 in FIG. 4).

  The positive electrode layer slurry is prepared by kneading a positive electrode active material, a conductive agent, a binder, and a solvent. The weight ratio of the positive electrode active material, the conductive agent, and the binder is, for example, 75 to 85:10 to 20: 5 to 10, and preferably 85: 10: 5 to 75: 20: 5.

  The negative electrode layer slurry is prepared by kneading a negative electrode active material, a binder, and a solvent. The weight ratio of the negative electrode active material and the binder is, for example, 85 to 95: 5 to 15.

  Examples of the solvent include N-methyl-2-pyrrolidone (NMP).

  (2) Next, a positive electrode layer slurry is formed in a predetermined thickness on both main surfaces of the positive electrode side current collector 104a to produce the positive electrode plate 101, and on both main surfaces of the negative electrode side current collector 105a, a predetermined amount is provided. A negative electrode layer slurry is formed with a thickness to produce a negative electrode plate 103 (see S2 in FIG. 4).

  (3) Next, the produced positive electrode plate 101 and the negative electrode plate 103 are alternately laminated with the separator 102 interposed therebetween, thereby producing an electrode laminate (see S3 in FIG. 4). The number of stacked electrode plates 101 and 103 is not particularly limited, and may be set so as to ensure a predetermined battery capacity.

  In the present embodiment, the positive electrode plates 101 and the negative electrode plates 103 are alternately stacked in such an order that the separators 102 are positioned between the positive electrode plates 101 and the negative electrode plates 103. By laminating the separators 102 one by one at the bottom, an electrode laminate is produced.

  (4) Next, the positive electrode terminal 104 and the negative electrode terminal 105 are respectively connected to each positive electrode side current collector 104a and each negative electrode side current collector 105a extending from the inside to the outside of the produced electrode laminate ( (See S4 in FIG. 4).

  Specifically, the positive electrode terminal 104 is connected to the positive electrode side current collectors 104 a of the two positive electrode plates 101 via the positive electrode leads 104 c, and the negative electrode side current collectors 105 a of the two negative electrode plates 103 are connected to the positive electrode side current collectors 105 a. On the other hand, the negative electrode terminal 105 is connected via the negative electrode lead 105c.

  (5) Next, the electrode laminated body to which the electrode terminals 104 and 105 are connected is wrapped between the upper battery outer casing 106 and the lower battery outer casing 107 while a part of the electrode terminals 104 and 105 is led out from the outer peripheral edge. Accommodate.

  Next, after injecting an electrolyte into the space formed by the upper and lower battery casings 106 and 107, the outer peripheral edges of the upper and lower battery casings 106 and 107 are sealed by a technique such as thermal fusion (see S5 in FIG. 4). ).

  Specifically, first, a total of three sides of the upper and lower battery casings 106 and 107, that is, two short sides and one long side are heat-sealed. Next, an electrolytic solution is injected from an opening formed on one side of the long side where the upper and lower battery casings 106 and 107 remain. The injection amount of the electrolytic solution is appropriately determined. Next, while the inside of the space formed inside the upper and lower battery casings 106 and 107 is decompressed, the remaining long side opening portion of the upper and lower battery casings 106 and 107 is sealed by a technique such as heat sealing. .

  The positive terminal 104 is led out from one end portion of the sealed battery casings 106 and 107, but a gap is generated at the junction between the upper battery casing 106 and the lower battery casing 107 by the thickness of the positive terminal 104. . Therefore, in order to maintain the sealing performance in the battery outer casings 106 and 107, a method such as heat-sealing a seal film made of polyethylene or polypropylene at a portion where the positive electrode terminal 104 and the battery outer casings 106 and 107 are in contact with each other. Can also be interposed.

  Similarly, the negative electrode terminal 105 is led out from the other end portion of the sealed battery casings 106 and 107. Here, similarly to the positive electrode terminal 104 side, the negative electrode terminal 105 and the battery casing 106 are also connected. , 107 can also be interposed with a seal film. In any of the positive electrode terminal 104 and the negative electrode terminal 105, it is desirable from the viewpoint of heat-fusibility that the seal film is made of the same type of resin as the resin constituting the battery casings 106 and 107.

  (6) Next, an aging process is performed on the thin battery 10 manufactured through the above steps (see S6 in FIG. 4). In order to remove the initial deterioration of the manufactured thin battery 10 and stabilize the battery performance, the aging process is performed by first performing an initial charge and then leaving it in that state for a predetermined period.

  Incidentally, when this type of thin battery 10 is manufactured, foreign matter such as metal may be inevitably mixed into the surface of the positive electrode plate 101 (particularly, the positive electrode layer 104b) disposed in the battery outer casings 106 and 107. When foreign metal is mixed in the surface of the positive electrode plate 101, the foreign metal is dissolved and ionized at the portion in contact with the electrolytic solution. Thereafter, the ionized foreign metal cannot be kept in an as-is state (ionized state) and is eventually deposited on the surface of the positive electrode plate 101. When the foreign metal deposit trace deposited on the surface of the positive electrode plate 101 reaches the negative electrode plate 103 through the separator 102, an internal short circuit of the battery 10 occurs. These phenomena tend to be further activated during charging and discharging.

  Therefore, in order to prevent such an internal short circuit from occurring after shipment, conventionally, the above-described battery mixed with the foreign metal (hereinafter also referred to as “specific battery”) has been selected. As a screening method, after initial charging of a battery just manufactured, the voltage is adjusted or heated within a predetermined aging period to create a state in which foreign metal is easily dissolved. In general, a method of extracting a specific battery by short-circuiting is used.

  However, in such a conventional method, in order to discover a specific battery, for example, an aging time over a long period of one month is required.

  In the present embodiment, at least the aging treatment is performed, the thin battery 10 produced as described above is pressurized (see S6 in FIG. 4). When the thin battery 10 is pressurized, the distance (the thickness of the separator 102) between the positive electrode plate 101 and the negative electrode plate 103 inside the battery 10 decreases. By reducing this distance, the deposit traces of foreign metal deposited on the surface of the positive electrode plate 101 can reach the negative electrode plate 103 earlier. That is, a minute short circuit can be performed at a short distance in a short time, and the occurrence of an internal short circuit can be accelerated. In addition, the deposit traces of foreign metal tend to grow and increase over time (large size). In the present embodiment, a minute short circuit can be detected in a short time without waiting for the growth of the deposition trace.

  In the present embodiment, it is preferable to start pressurization of the thin battery 10 from the initial charge before entering the aging process. As described above, the phenomenon in which the foreign metal mixed in the positive electrode plate 101 is ionized by contact with the electrolytic solution tends to be activated during charging and discharging. In this way, by pressing the battery 10 at the stage where the foreign metal is activated, the micro short circuit can be performed in a shorter time.

  Note that the pressurization according to the present embodiment may be continued at least halfway through aging, and it is not always necessary to continue the pressurization until the end of aging (until a short circuit occurs in the present embodiment). This is because even if the pressurization is stopped in the middle of aging, the effect of the present embodiment can be obtained if the pressurization is continued for a predetermined period until then.

  In this embodiment, the pressurization of the battery 10 at least during aging can be performed using, for example, the pressurization continuation apparatus 200 shown in FIG. 5 includes a rectangular upper plate 201a (second plate) and a lower plate 201b (first plate) arranged at a predetermined interval. Through holes 202 are formed at the four corners of the upper and lower plates 201a and 201b, and bolts (pressurizing continuation means) 203 are inserted between the corresponding through holes 202 of the plates 201a and 201b. A nut 204 (pressurization continuation means) is fastened to the bolt 203 from the lower side of the lower plate 201b. By tightening the nut 204, the space between the upper and lower plates 201a and 201b can be reduced while maintaining the parallel state of the upper and lower plates 201a and 201b.

  First, the battery 10 is placed between the upper and lower plates 201a and 201b and on the lower plate 201b using the pressurization continuation device 200 having such a configuration. Next, by tightening the nut 204, the distance between the upper and lower plates 201a and 201b is decreased, and the battery 10 is pressurized so as to apply a predetermined surface pressure.

  In the pressurization according to the present embodiment, it is preferable to apply a predetermined pressure to the thin battery 10 so that the thickness of the separator 102 is displaced. If the pressure to be applied is too small, the thickness of the separator 102, that is, the distance between the positive electrode plate 101 and the negative electrode plate 103 is not displaced. On the other hand, even if an excessively large pressure is applied, only the members other than the separator 102 are displaced, and the above-described effect cannot be obtained.

  The pressurization according to the present embodiment is such that the thickness of the thin battery 10 is displaced within a range of 2% or more and 25% or less, that is, a surface having a thickness of 75 to 98% when the thickness before pressurization is 100%. It is preferable to apply pressure. Even if pressure is applied within a range where the thickness of the battery 10 is not significantly displaced, the effect of displacing the thickness of the separator 102 cannot be obtained. On the other hand, even if pressure is applied in a range in which the thickness of the battery 10 is displaced too much, an effect commensurate with it cannot be obtained, there is a tendency to consume a lot of energy and waste energy, and problems such as a creep phenomenon are feared. It is.

  FIG. 6 shows a state of a load test performed to confirm the influence of pressurization inside the single battery 10. As shown in FIG. 6, when the thickness displacement amount of the battery 10 is less than 2%, the above-described effects tend not to be noticeable. Further, it can be understood that the thickness displacement amount of the battery 10 approaches the saturated state at around 20%, and when it exceeds 25%, the compressibility of the separator 102 approaches the saturated state with respect to the load.

Pressure according to the present embodiment, with respect to thin battery 10, 0.01 kg / cm ² or more, it is preferable to apply a 25 kg / cm ² or less of a load. Thereby, the surface pressure which displaces in the range whose thickness of the thin battery 10 is 2% or more and 25% or less can be applied. If the applied load is too small, the above-described effects tend not to be obtained. On the other hand, if the load applied is too large, the above-described effects can be obtained, but the effects commensurate with it cannot be obtained, the energy efficiency tends to deteriorate, and the influence of the creep phenomenon or the like is feared.

  Note that the battery 10 as the object of pressurization may be a single battery or a stacked body in which a plurality of batteries are stacked.

  Moreover, the pressurization continuation apparatus 200 mentioned above may be provided with the charging / discharging test function as shown, for example in FIG. When the charging / discharging function is provided in the apparatus 200, for example, after the battery 10 is disposed between the upper and lower plates 201 a and 201 b, the contact pins 210 are respectively connected to the positive electrode terminal 104 or the negative electrode terminal 105 with respect to the battery 10. The battery 10 is supplied with electric power for charging from the power supply unit 220 through the contact pins 210. In the case of discharging, the power supply unit 220 is switched to the load unit.

  As described above, according to the present embodiment, when the thin battery 10 is aged, the pressurization by the pressurization continuation device 200 is continued, so that a micro short-circuit generated inside the battery 10 as compared with the case where no pressurization is performed. The occurrence of is promoted. When the generation of the micro short circuit is promoted, the battery 10 that may generate the micro short circuit is detected in a short time. As a result, the time required for shipping inspection can be shortened.

  Hereinafter, the present invention will be described based on more detailed experimental examples. However, the present invention is not limited to these experimental examples.

Example 1
First, the positive electrode plate 101 and the negative electrode plate 103 shown in FIGS. 2 and 3 were produced. The positive electrode plate 101 is a slurry for a positive electrode layer in which a powder obtained by mixing LiMn ₂ O ₄ (positive electrode active material) with carbon black (conductive aid) and PVDF (binder) is dispersed in N-methyl-2-pyrrolidone (NMP). The slurry is uniformly applied to both main surfaces of an aluminum foil (positive electrode side current collector 104a) having a thickness of 20 μm, dried, and then compressed by a roll press machine, followed by a predetermined size (for example, width 70 mm, length). 120 mm, thickness 0.18 mm). In this example, as shown in FIG. 7, liquid paste is sprayed on the surface of the positive electrode plate 101, and SUS foil (a cylindrical body having a diameter of 1 mm and a thickness of 30 μm) as an example of a foreign metal is adhered and mixed. It was.

  The negative electrode plate 103 is obtained by dispersing a powder obtained by mixing hard carbon (negative electrode active material) with PVDF (binder) in N-methyl-2-pyrrolidone (NMP) to form a slurry for a negative electrode layer, and the slurry is made of copper foil (negative electrode side). It is produced by uniformly applying to both main surfaces of the current collector 105a) and drying, and then compressing with a roll press machine and then cutting into a predetermined size (for example, width 70 mm, length 120 mm, thickness 0.11 mm). did.

  Next, an electrode laminate was produced. The electrode laminate was produced by alternately laminating the positive electrode plate 101 and the negative electrode plate 103 with the separator 102 interposed therebetween. The number of stacked electrode plates 101 and 103 was set to 3 each so that a predetermined battery capacity could be secured. As the separator 102, a single layer film (film) made of polyethylene having a thickness of 20 μm was used.

  Next, electrode terminals 104 and 105 were formed. The electrode terminals 104 and 105 are respectively made of an aluminum positive electrode terminal 104 and a nickel negative electrode with respect to each positive electrode side current collector 104a and each negative electrode side current collector 105a extending from the inside to the outside of the produced electrode laminate. The terminals 105 were formed by welding.

  Next, the electrode laminate in which the electrode terminals 104 and 105 are formed is accommodated between the two battery casings 106 and 107, and part of the electrode terminals 104 and 105 are led out from the outer peripheral edge, A total of three sides, 107, two short sides and one long side were heat-sealed, and a predetermined amount of electrolyte was injected from the opening formed in the remaining one. Next, a battery sample as the thin battery 10 was obtained by heat-sealing the remaining one side in a state where the space formed by the battery exteriors 106 and 107 was decompressed.

For the battery casings 106 and 107, a resin-metal thin film laminate material in which an inner layer of aluminum foil was laminated with polyethylene and an outer layer was laminated with nylon was used. As the electrolytic solution, a solution obtained by dissolving lithium hexafluorophosphate (LiPF ₆ ) as a supporting electrolyte in a mixed solvent of propylene carbonate (PC), ethylene carbonate (EC), and diethyl carbonate (DMC) was used.

  Next, the obtained battery sample was initially charged with a voltage of 4.3 V and aged in an environment of 40 ° C. As a result, it took 14.5 days to short-circuit the battery sample.

<< Experiment 2 >>
After the battery sample produced under the same conditions as in Experimental Example 1 is set in the pressurization continuation apparatus 200 having the charge / discharge function shown in FIG. 5, the upper and lower plates 201a and 201b are tightened by tightening the nut 204 of the apparatus 200. A pressure (load) is applied to the battery sample through which the thickness of the battery sample is displaced by about 10 to 20%. In this state, the battery sample was aged under the same conditions as in Example 1. Pressurization continued during aging. As a result, the number of days required to short-circuit the battery sample was 8 days.

<< Experimental Example 3 >>
Although the pressurization for the battery sample was started from the time of initial charging, the number of days required for short-circuiting under the same conditions as in Experimental Example 2 except that the pressurization of the battery sample was stopped when 5 days had elapsed after the start of aging. evaluated. As a result, the number of days required to short-circuit the battery sample was 11 days.

  The evaluation results of Experimental Examples 1 to 3 are shown in FIG.

  As shown in FIG. 8, it was confirmed that the number of days required for short-circuiting was decreased according to the number of days for which pressurization was continued. When the aging is performed while continuing the pressurization (Experimental Examples 2 and 3), the number of days required for the short circuit is 6.5 days and 3. It was confirmed that it could be shortened by 5 days. In addition, according to Experimental Examples 2 and 3, it was confirmed that the amount of precipitation traces decreased compared to the case in Experimental Example 1. The reason why the number of days required until the short circuit can be shortened is considered that the pressurization of the battery sample was continued during the aging. By continuing the pressurization, the distance between the positive electrode plate 101 and the negative electrode plate 103 inside the battery sample, that is, the state in which the thickness of the separator 102 is reduced is continued. It is thought that short-circuiting was caused by a short time and a small amount of precipitation traces.

  Even when the pressurization was stopped in the middle of aging as in Experimental Example 3, the pressurization was continued for a certain period until then, and it is considered that the effect of the present invention was obtained.

  In addition, it was confirmed that there is a proportional relationship equivalent to that of FIG. That is, if the pressurization duration time is long, a micro short circuit could be confirmed even in a state where the amount of precipitation was small.

FIG. 1 is a plan view showing a thin battery according to this embodiment. FIG. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a detailed sectional view showing the inside of the thin battery of FIG. FIG. 4 is a process diagram showing an example of a method for manufacturing the thin battery of FIG. FIG. 5 is a cross-sectional view showing an example of a pressurization continuation device used to pressurize the thin battery of FIG. FIG. 6 is a graph showing the relationship of the compression rate of the separator to the thickness displacement amount of the thin battery of FIG. FIG. 7 is a perspective view for explaining the inside of the battery samples produced in Experimental Examples 1 to 3. FIG. 8 is a graph showing the relationship between the number of days required for short circuiting and the number of pressurization days of the battery samples of Experimental Examples 1 to 3.

Explanation of symbols

10 ... Thin battery (battery)
101 ... Positive electrode plate (positive electrode)
102 ... Separator 103 ... Negative electrode plate (negative electrode)
DESCRIPTION OF SYMBOLS 104 ... Positive electrode terminal 104a ... Positive electrode side collector 104b ... Positive electrode layer 104c ... Positive electrode lead 105 ... Negative electrode terminal 105a ... Negative electrode side current collector 105b ... Negative electrode layer 105c ... Negative electrode lead 106 ... Upper battery exterior (exterior)
107 ... lower battery exterior (exterior)
200 ... Pressurizing continuation device 201a ... Upper plate (first plate)
201b ... Lower plate (second plate)
202 ... through hole 203 ... bolt (pressure continuation means)
204 ... Nut (pressure continuation means)

Claims (10)

A method for producing a battery in which an electrode laminate in which positive electrodes and negative electrodes are alternately laminated via a separator is housed in a case together with an electrolytic solution and sealed, and the battery is aged.
In the aging treatment, the battery is pressurized in the stacking direction of the positive electrode and the negative electrode. A battery manufacturing method according to claim 1, comprising:
A method for manufacturing a battery, comprising pressurizing the battery with a pressure at which a thickness of the separator is displaced. A battery manufacturing method according to claim 1, comprising:
A method of manufacturing a battery, comprising pressurizing the battery at a pressure that can continue to decrease the distance between the positive electrode and the negative electrode for a predetermined time. It is a manufacturing method of the battery according to any one of claims 1 to 3,
A method for manufacturing a battery, comprising pressurizing the battery at a pressure at which the thickness of the battery is displaced by 2 to 25%. It is a manufacturing method of the battery according to any one of claims 1 to 4,
A method for producing a battery, comprising pressurizing the battery with a load of 0.01 to 25 kg / cm ² . A method for producing a battery according to any one of claims 1 to 5,
A method for producing a battery, comprising pressurizing the battery at least halfway through the aging treatment. It is a manufacturing method of the battery according to any one of claims 1 to 6,
A battery manufacturing method comprising pressing a battery stack in which a plurality of the batteries are stacked. It is a manufacturing method of the battery as described in any one of Claims 1-7,
A method for producing a battery, comprising using the battery whose exterior is made of a laminate material. Pressurization that continues pressurization in the laminating direction of the positive electrode and the negative electrode when aging the battery in which the electrode laminate in which the positive electrode and the negative electrode are alternately laminated via the separator is accommodated in the case together with the electrolyte. A continuation device,
A first plate on which the battery can be placed;
A second plate disposed at a predetermined interval with respect to the first plate;
Pressurization having pressurization continuation means that pressurizes the battery by moving the second plate relative to the first plate in a state where the battery is placed on the first plate Continuation device.   It is a pressurization continuation apparatus of Claim 9, Comprising: The pressurization continuation apparatus provided with the charging / discharging function.

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