JP2008300336A - Battery and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of preventing a short circuit generated between positive and negative electrodes, in a structure composed by arranging the positive and negative electrodes on a base material; and its manufacturing method. <P>SOLUTION: This manufacturing method of this battery 10 using a PPS sheet for the base material 1 is characterized by pre-annealing the PPS sheet at a temperature over 170°C and below (the melting point of PPS - 10)°C before forming one of thin films of the battery on the PPS sheet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a battery and a method for manufacturing the battery, and more specifically to a battery that is less likely to cause a short circuit and a method for manufacturing the same.

In an era when a variety of batteries are installed in portable electronic devices, batteries are always required to be lighter, smaller, or have higher energy density, and in response to this, battery characteristics such as battery capacity are improved. It has been. For example, an all-solid-state secondary battery in which positive and negative electrodes are arranged in a comb-teeth shape on the same plane has been disclosed in order to reduce the size and weight while realizing high energy density and high output (Patent Document 1). According to this secondary battery, it is possible to reduce the thickness with high energy density and high output. Also disclosed is a solid secondary battery in which a solid electrolyte layer is sandwiched on a flat surface with a positive electrode layer formed on one side and a negative electrode layer formed on the opposite side by a screen printing method with an emphasis on prevention of short circuit. (Patent Document 2). According to this solid secondary battery, a short circuit is prevented and the self-discharge characteristics can be improved. Further, in order to reduce the thickness and weight by using a metal piece for the electrode, the first wiring electrode layer and the second wiring electrode layer are disposed on the insulating film on the substrate plane, and the solid electrolyte layer is interposed therebetween. A lithium secondary battery formed so as to be sandwiched is disclosed (Patent Document 3).
JP 2006-147210 A Japanese Patent Publication No. 7-50617 Japanese Patent Laid-Open No. 10-284130

  However, in the above battery, when the positive and negative electrodes are arranged on a plane, the case where a short circuit occurs between the positive and negative electrodes could not be eradicated. For this reason, in the structure which has arrange | positioned the positive / negative electrode on the plane, development of the battery which can prevent the short circuit which arises between positive / negative electrodes was desired. An object of this invention is to provide the battery which can suppress a short circuit in the battery of the structure which has arrange | positioned positive and negative electrodes on a base material, and its manufacturing method.

  The battery manufacturing method of the present invention is a battery manufacturing method using an insulating resin layer as a base material. This manufacturing method is characterized by pre-annealing the insulating resin layer at a temperature exceeding 170 ° C. (melting point of the insulating resin −10) ° C. or lower before forming any thin film of the battery on the insulating resin layer.

  According to the above method, shrinkage corresponding to the pre-annealing temperature is caused in advance by pre-annealing in the insulating resin layer, and thereafter, the shrinkage or the like is not caused to proceed even when heated to a temperature lower than that. When the pre-annealing temperature is 170 ° C. or lower, in the subsequent battery manufacturing process, the film may be heated to about 170 ° C. or higher for film formation, and heat shrinkage may progress in the subsequent step. The pre-annealing temperature is exceeded. Further, if the heating temperature exceeds (the melting point of the insulating resin−10) ° C., the insulating resin layer is softened to cause inconvenience, so that the melting point of the insulating resin is −10 ° C. or lower. Naturally, the melting point changes if the type of the insulating resin layer changes. Even if the battery is heated to about 170 ° C. or higher in the subsequent battery manufacturing process by the above pre-annealing, a large warp or deformation due to the shrinkage of the insulating resin layer does not occur. As a result, it is possible to prevent a short circuit due to the deformation of the insulating resin layer such as a pattern shift.

  The insulating resin layer can be heated to (melting point of insulating resin−80) ° C. or higher. Thus, the shrinkage can be caused to be larger in advance by pre-annealing, and the deformation such as the shrinkage can be surely prevented when the metal pattern is formed later. Only in the case of the present invention, the insulating resin that can be heated to (melting point of insulating resin−80) ° C. or higher is intended for those whose melting point is 250 ° C. or higher.

  In addition, after the pre-annealing treatment of the insulating resin layer, surface heating can be performed by heating from the surface side of the insulating resin layer or the battery intermediate product. According to this method, when a metal pattern or the like is formed, the lower layer can be easily heated to a temperature convenient for film formation. A contraction in the thickness direction of shrinkage occurs, and warping is greatly generated. However, in the present invention, since the pre-annealing treatment is performed as described above, a thickness gradient due to thermal shrinkage hardly occurs, so that the warp can be suppressed even if the surface heating is performed. The surface means the surface on the side where the battery body is formed.

  Further, after the pre-annealing of the insulating resin layer, the intermediate product of the battery can be heated to a temperature lower than the pre-annealing heating temperature during the battery manufacturing process. Thereby, in the manufacturing process after pre-annealing, deformation due to heat shrinkage is prevented, pattern deviation is prevented, and a battery in which short circuit is suppressed can be obtained. In addition, the heating temperature of the intermediate product of the battery is a temperature when the intermediate product is heated as a whole, and does not include a local temperature, for example, a surface layer temperature.

  The metal pattern can be formed into a comb-like pattern. By this method, it is possible to obtain a battery with a small risk of short circuit while increasing the battery capacity.

  The direction of the comb teeth of the above comb-tooth pattern can be in a direction intersecting with the width direction of the insulating resin layer. This method usually uses an insulating resin layer that has anisotropy in heat shrinkage, and comb teeth that require pattern accuracy in a direction with a smaller heat shrinkage rate (a direction that intersects the width direction, especially the orthogonal direction). The arrangement direction (direction orthogonal to the comb extending direction) can be matched. As a result, pattern deviation can be prevented more reliably.

  A battery manufactured by any one of the battery manufacturing methods described above is less susceptible to pattern displacement since thermal shrinkage is suppressed after pre-annealing, and as a result, a short circuit can be prevented.

  The battery of the present invention is a battery using an insulating resin layer as a base material. This battery includes a metal pattern located on the insulating resin layer. Then, when the battery body is heated to a predetermined temperature of (the melting point of the insulating resin−10) ° C. or lower, the deformation occurrence temperature at which deformation such as warpage occurs is larger than in the initial state of the battery body. When determined, the deformation occurrence temperature is not at least in the range of less than (melting point of insulating resin−80) ° C.

  According to said structure, since the battery of this invention presupposes that pre-annealing is performed at (melting | fusing point of insulating resin-80) degreeC or more, heat shrinkage is fully produced beforehand. For this reason, even if it heats, an insulating resin layer does not produce thermal contraction greatly, but the battery is manufactured without pattern shift, and it can be said that the short circuit is suppressed.

  Note that if the deformation occurrence temperature is not at least less than (the melting point of the insulating resin −80) ° C., the deformation occurrence temperature exceeds 200 ° C., and the temperature exceeds the pre-annealing temperature that cannot be immediately known from the battery body alone. Or the deformation occurrence temperature itself cannot be obtained even if measurement is performed.

  When attention is paid to another feature of the battery of the present invention, it is expressed as follows. This battery includes a metal pattern located on the insulating resin layer. Then, when the insulating resin layer is heated to a predetermined temperature of (the melting point of the insulating resin−10) ° C. or lower, the processed tissue disappearance temperature at which the degree of disappearance of the processed tissue is larger than the initial state of the battery body. When determined, the processed tissue disappearance temperature is not at least in the range of less than (melting point of insulating resin−80) ° C.

  In the insulating resin layer of the battery, thermal deformation or thermal shrinkage occurs when the processed tissue disappears, the structure is randomized (isotropic), or the polymer is rearranged. During this time, the reaction of the polymer itself (polymerization progress, polymer fragmentation, etc.) may occur. The meaning that the processed tissue disappearance temperature is not at least (the melting point of the insulating resin −80) ° C. or less is the same as the above description of the deformation occurrence temperature. The battery of the present invention expresses the present invention by paying attention to the processed structure, but a specific method for obtaining the processed structure will be described in the embodiment.

  In the cross section of the insulating resin layer, it is possible to adopt a configuration in which the processed structure does not remain in an inclined shape that is small on the front surface side where the metal pattern is located and large on the back surface side. As a result, it was confirmed that this battery had not undergone “a state in which a large warp occurred during the manufacturing process due to heating from the surface side”, and was already pre-annealed when heated from the surface side. I can know. More specifically, in the battery of the present invention, the processed structure of the insulating resin layer has already largely disappeared by the pre-annealing process.

  The metal pattern can be a comb-like pattern. As a result, it is possible to obtain a battery that has a high capacity and prevents a short circuit.

  The above comb teeth can be oriented in a direction intersecting the width direction of the insulating resin layer. As a result, pattern accuracy is required in the direction where the thermal shrinkage rate is smaller (in the direction intersecting the width direction, especially in the orthogonal direction) while using a long insulating resin sheet with anisotropy in thermal shrinkage as a raw material. The comb tooth arrangement direction (direction orthogonal to the comb tooth extending direction) can be matched. As a result, pattern deviation can be prevented more reliably.

According to the battery and the manufacturing method thereof of the present invention, it is possible to suppress a short circuit in the structure in which the positive electrode and the negative electrode are arranged on the base material.

(Embodiment 1)
FIG. 1 is a perspective view showing a battery main body 10 according to Embodiment 1 of the present invention. On the base material 1 made of the insulating resin layer, a positive current collecting layer of a metal pattern that is positioned in parallel so as to face the end in the width direction and extends along the width direction of the insulating resin layer 1 2 and the negative current collecting layer 6. Both the metal pattern 2 and the negative current collecting layer 6 have comb teeth extending in a comb shape toward the other side. A plurality of positive electrode layers 3 are overlapped with the comb-tooth portion and extend in a comb-tooth shape toward the negative-side current collecting layer 6, and the plurality of negative electrode layers 5 are similarly formed on the negative-side current collector of the comb-like portion. It overlaps with the electric layer 6 and extends in a comb shape toward the positive current collecting layer 2 of the metal pattern. The plurality of comb teeth of the positive electrode layer 3 and the plurality of comb teeth of the negative electrode layer 5 are alternately arranged and face each other with the electrolyte layer 4 interposed therebetween. The electrolyte layer 4 covers the positive electrode layer 3 and the insulating resin layer 1 located on the insulating resin layer 1, and the negative electrode layer 5 and the negative current collecting layer 6 are formed on the electrolyte layer 4. . Note that as shown in the third embodiment later, the electrode layer may not have a comb-tooth structure.

  2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 and 3, the positive electrode layer 3 and the metal pattern (positive current collecting layer) 2 are located below the electrolyte layer 4, and the negative electrode layer 5 and negative current collecting layer 6 are the electrolyte, with the electrolyte layer 4 interposed therebetween. Each is formed on the upper side of the layer 4. For this reason, it can prevent more reliably by the arrangement | positioning of the electrolyte layer 4 that a positive electrode and a negative electrode contact and short-circuit. Further, the positive electrode layer 3 and the negative electrode layer 5 are close to each other with the electrolyte layer 4 interposed therebetween and face each other with a high surface density, whereby the efficiency of the battery reaction can be improved. The widths of the metal pattern (positive current collecting layer) 2 and the negative current collecting layer 6 are both about 0.5 mm, and the thickness of the metal pattern on the insulating resin sheet 1 is about 0.2 μm.

Next, a method for manufacturing the battery main body 10 shown in FIGS. 1 to 3 will be described. For the base material 1 of the insulating resin layer, a polyphenylene sulfide (PPS) sheet (melting point: 280 ° C.) is preferably used. Instead of PPS, polyether ether ketone (PEEK, melting point of about 340 ° C.), polysulfone (PSF, melting point of 190 ° C. or higher), polyether sulfone (PES, melting point of 210 ° C. or higher), or the like may be used.
(1) Substrate 1: The PPS sheet is pre-annealed at 230 ° C. for 5 to 30 minutes. The pre-annealing process is performed by charging the entire PPS sheet into the heat treatment furnace using a heat treatment furnace. After this pre-annealing process, the PPS sheet is punched to form the base material 1. The size of the substrate 1 is, for example, 50.5 mm × 37.5 mm. The thickness of the PPS sheet is preferably 25 μm. Next, the positive current collecting layer 2 having a comb-like metal pattern as shown in FIG. 4 is formed on the substrate 1.

(2) Metal pattern (positive current collecting layer) 2: A Ni metal pattern is formed while the surface side is heated to 170 to 230 ° C. by a heater. In the heating by this heater, the lower (back side) temperature of the substrate 1 is 50 to 130 ° C. The entire PPS sheet 1 is not heated to 170 to 230 ° C., but is heated with a temperature gradient of high temperature on the front side and low temperature on the back side. If the pre-annealing treatment is not performed, thermal shrinkage inclined in the thickness direction occurs here, and the PPS sheet 1 warps greatly with the surface side being concave. However, since the pre-annealing process is performed as described above, thermal contraction with a gradient in the thickness direction is suppressed.

The direction in which the comb teeth extend is parallel to the roll direction of the PPS sheet 1 having a high thermal contraction rate. That is, the parallel direction of the comb teeth is set to be parallel to the width direction of the PPS sheet 1. The Ni film forming condition is performed by electron beam evaporation, and the pressure in the film forming chamber is set to 1.96 to 1.54 × 10 ⁻³ Torr. The emission current is 110 mA, the film formation rate is 0.4 to 0.5 nm / s, and the monitor film thickness is 0.2 μm.

(3) Positive electrode layer 3: It is formed by applying a coating liquid containing a powdered positive electrode active material, a conductive additive, and a binder and drying it. One type or two or more types of powders such as LiMnO ₂ , LiCoO ₂ , MnO ₂ , FeS, and FeS ₂ are used as the positive electrode active material. Carbon particles are used as the conductive aid. As the binder, a known binder such as polyvinylidene fluoride (PVdF), polytetrafluoroethylene, ethylene-propylene-diene copolymer or the like may be used. Any known solvent can be used as the solvent. After apply | coating said coating liquid, 85-120 degreeC * the vacuum drying process for 12 hours is performed. Next, an electrolyte layer is formed.

(4) Electrolyte layer 4: (SE1) Li—P—S—O based amorphous film or polycrystalline film may be used to form the electrolyte layer, or (SE 2) Li—P—O—N based amorphous film Alternatively, the electrolyte layer may be formed by a polycrystalline film. Alternatively, two electrolyte layers may be formed, the positive electrode side layer may be formed of (SE1), and the negative electrode side layer may be formed of (SE2).

(5) Negative electrode layer 5: (NE1) Even if the negative electrode layer is formed of a Li metal film or an alloy film such as Li—Al, Li—Mn—Al, Si, Si—N, Si—Co, or Si—Fe. Good. The deposition temperature of the Li metal film or the like is about 170 ° C. Further, it may be a coating layer formed by coating a coating solution containing (NE2) carbon, Si powder or the like, carbon particles of a conductive additive, and a binder. In this case, the heat history of the vacuum drying process similar to the case where the positive electrode layer is formed of the coating layer is received. In the case of (NE1), the negative current collecting layer 6 can also serve as the negative electrode layer 5. However, whether or not the negative current collecting layer is provided is not determined only by the negative electrode material. Even in the case of (NE1), if it is preferable to provide a negative current collecting layer in an overall judgment to improve battery performance, the negative current collecting layer 6 shown in FIGS. Is done normally.

(6) Sealing: The PPS sheet 1 on which the battery body 10 is formed is sandwiched between aluminum films, and the four corners are thermocompression bonded. At the time of thermocompression bonding, the pressure-bonded portion contacts a ceramic heater at 210 to 230 ° C.

  The heat history of the above processing is shown in FIG. In FIG. 5, the negative electrode layer 5 is formed by the above (NE1). According to FIG. 5, the PPS sheet substrate 1 is heated to 230 ° C. during pre-annealing. This temperature is higher than any of the heating temperatures in later processing steps. The Ni pattern is heated to 170-230 ° C. by the heater at the time of forming the Ni pattern. At this time, when pre-annealing is not performed as described above, thermal contraction with a gradient in the thickness direction occurs, and warpage is greatly generated. However, it is suppressed because of pre-annealing. As a result, it is possible to prevent the occurrence of pattern deviation and prevent a short circuit in a later processing step.

(Evaluation of processing structure of insulating resin layer)
Next, evaluation of the processed structure of the insulating resin layer will be described. As the insulating resin layer of the battery, a long insulating resin sheet that is rolled (rolled) and wound into a raw material is cut into a predetermined size and used. In the insulating resin layer, a roll processing structure is generated, and this roll processing structure indicates which plane orientation of molecules constituting the resin is accumulated in the rolling surface, and which direction of molecules is accumulated in the rolling direction. It depends on the polymer compound. Processing energy is accumulated in the roll processing structure, and when the temperature is raised, polymer rearrangement occurs using this processing energy as a driving source, and the processing energy is released. In parallel with this, a reaction of the polymer itself (advancing polymerization reaction, fragmentation of the polymer, etc.) may occur. It is not clear which factor heat shrinkage is attributed to, but the above phenomenon occurs while heat shrinkage occurs.

  In the evaluation (measurement) of the change in the degree of the processed structure due to the heating of the battery body, the following points should be noted. Since the above measurement is performed after the battery is assembled, careful attention should be paid when disassembling to avoid applying stress during disassembly. After taking out the PPS sheet, the degree of integration such as the specific plane orientation of the processed structure can be evaluated by an X-ray diffraction method or the like. When the degree of integration of a specific surface is high, the intensity of the diffraction line corresponding to that specific surface is high, the half width is narrow, and conversely, recrystallization proceeds, and when the degree of integration is low, the intensity of the line is low and broad. Buried in the background. In addition, the above processed structure causes anisotropy of mechanical properties, and, for example, anisotropy such as tensile strength, yield strength, elongation, and drawing is generated in a tensile test. Therefore, by collecting both tensile test pieces that are long in the roll direction and tensile test pieces that are long in the width direction, and determining the anisotropy in any of the above properties, In addition, the size and presence / absence of the processed tissue can be evaluated.

(Evaluation of battery body deformation)
It is the same as the evaluation of the processed structure in that stress applied during dismantling is avoided. And as above-mentioned, since the four corners are thermocompression-bonded as mentioned above, it is good to remove this by punching etc. and to remove an aluminum film. In addition, a large number of samples can be heated to a predetermined temperature to measure deformation such as warping and bending by setting an appropriate index such as a difference in height position between the central portion and the end portion. it can.

(Embodiment 2)
FIG. 6 is a diagram illustrating the battery main body 10 according to Embodiment 2 of the present invention. In this battery body 10, a metal pattern (positive current collecting layer) 2 and a metal pattern (negative current collecting layer) 6 are comb-like on a base material 1 made of an electrically insulating PPS sheet. A plurality of comb teeth are extended to the current collecting layer on the other side, and the electrode layers 3 and 5 having the same polarity are formed on the current collecting layer to form a comb structure. The electrolyte layer 4 is formed of the PPS sheet 1 and the current collecting layer so as to fill the space between the positive current collecting layer 2 and the positive electrode layer 3 and the negative side current collecting layer 6 and the negative electrode layer 5. 2 and 6 and positive and negative electrode layers 3 and 5 are covered.

  7 is a cross-sectional view taken along line VII-VII in FIG. 6, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. As shown in FIGS. 7 and 8, the positive electrode layer 3 and the negative electrode layer 5 are both located on the lower surface side of the electrolyte layer 4, and the electrolyte layer 4 filling the space between the positive and negative electrodes is short-circuited between the positive and negative electrodes. Is preventing. This point is different from the battery main body of the first embodiment, and the other configurations are the same. According to this difference in configuration, the formation of the battery pattern is simplified as compared with the first embodiment. Since the PPS sheet 1 is subjected to the above-described pre-annealing treatment, thermal contraction during the manufacturing process of the battery body is suppressed, and a short circuit due to pattern deviation can be prevented. However, in order to prevent a short circuit between the positive and negative electrodes, the space between the positive and negative electrodes must be reliably filled with the electrolyte layer 4.

(Embodiment 3)
FIG. 9 is a diagram showing the battery main body 10 according to Embodiment 3 of the present invention. FIG. 10 is a sectional view taken along line XX of FIG. The battery pattern of the battery body 10 is not a comb structure, but is formed by a positive electrode layer 3 and a negative electrode layer 5 extending in parallel with the longitudinal direction of the PPS sheet of the substrate 1 as shown in FIG. The The materials for forming the PPS sheet 1, the positive and negative electrode layers 3 and 5, and the positive and negative current collectors 2 and 6 are the same as those described in the first embodiment, and the manufacturing method is also the negative electrode layer 5 and the negative current collector layer. Before and after the formation time of 6 is reversed, the others are the same.

  According to FIG. 10, since the positive and negative electrode layers 3 and 5 are close to each other with the electrolyte layer 4 interposed therebetween, the surface density of the electrodes involved in the battery reaction can be increased. Further, since the battery pattern is simple unlike the comb shape, it is easy to form the battery pattern.

  Since the PPS sheet 1 is subjected to the above-described pre-annealing treatment, thermal contraction during the manufacturing process of the battery body is suppressed, and a short circuit due to pattern deviation can be prevented. However, from the viewpoint of preventing a short circuit or the like, it is preferable to form an insulating protective film that covers the exposed portion of the positive electrode layer 3 and / or the exposed portion of the negative electrode layer 5.

Example 1
The PPS sheet was punched into the size (50.5 mm × 37.5 mm) shown in the first embodiment, and the heating temperature was changed to 150 ° C., 170 ° C., 200 ° C. and 230 ° C. (after heating) Length / length before heating). The heating rate is a rate obtained by charging a PPS sheet that has been processed at room temperature into a furnace maintained at that temperature, and can be said to be a rapid heating rate. For this reason, the thermal history during heating can be almost ignored. The results are shown in FIG. From FIG. 11, anisotropy is recognized in the heat shrinkage, which is small in the width direction and large in the roll direction. The shrinkage in the roll direction is as large as about four times the width direction. Most notable is the temperature dependence of shrinkage in the roll direction. The shrinkage is about 1.3% at 150 ° C and about 1.8% at 170 ° C. However, as the temperature increases to about 2.7% at 200 ° C and about 4.2% at 230 ° C, It can be seen that the shrinkage greatly proceeds beyond the proportional relationship of / temperature.

  Since the melting point of PPS constituting the substrate 1 is 280 ° C., 230 ° C. corresponds to (melting point of PPS−50 ° C.). The temperature at which the shrinkage proceeds greatly can be considered to be 200 ° C. or more, that is, the shrinkage proceeds particularly greatly at (PPS melting point−80 ° C.) or more. This means that when the insulating resin layer as received or processed is heated to (melting point of PPS−80 ° C.), the accumulated processing energy is greatly released. If pre-annealing is performed at a temperature higher than the melting point of the PPS resin (−80 ° C.) or more, the driving energy of recrystallization that causes thermal shrinkage is sufficiently released and disappears. It is shown that it is hard to produce. Even if pre-annealing is performed at a temperature higher than 170 ° C. and lower than (melting point−80 ° C.), the processing energy is, of course, released as shown in FIG. However, a more desirable range is (melting point of PPS−80 ° C.) or more.

(Example 2)
In Example 2, warping and deformation of the substrate after forming a metal pattern (Ni pattern) were observed. A PPS sheet was punched into the size (50.5 mm × 37.5 mm) shown in the first embodiment to obtain a test specimen. The processed specimen was pre-annealed at 230 ° C. to form a Ni pattern layer as an example of the present invention. In forming the Ni pattern, as shown in FIG. 5, it was heated to 170-230 ° C. with a heater from the surface side of the substrate. Again, the temperature on the back side of the substrate at this time was 50-130 ° C. Further, as a comparative example, a test body that was not pre-annealed (as punched out) was used, and the formation of the Ni pattern was performed under the same heater heating conditions.

  Since the deformation is complicated, only the substrate was observed. Sketches created based on photographs of the substrate after forming the Ni pattern are shown in FIG. 12 (invention example) and FIG. 13 (comparative example). In the example of the present invention, the front side (Ni pattern side) is up, and in the comparative example, the warp is too large and unstable. Therefore, the front side (Ni pattern side) is down and the convex back side is up. ing. In the example of the present invention, although slightly warped as a whole, it is understood that there is no local deformation and the occurrence of pattern deviation is prevented. On the other hand, in the comparative example, the overall deformation (rounding) is large, and local unevenness occurs in many places, resulting in complicated uneven topography. For this reason, pattern slip is likely to occur, and many short-circuit occurrence candidate portions are generated in a later manufacturing process.

(Example 3)
After manufacturing the battery main body 10 described in the first embodiment, the presence or absence of a short circuit and other test items were inspected to evaluate the yield. In the application of the present invention, the base material 1 was pre-annealed at 230 ° C., and the subsequent manufacturing followed the process shown in FIG. In the conventional method, the pre-annealing of the base material 1 was omitted, and the Ni pattern was formed on the base material 1 in the processed state as received. The yield evaluation results are shown in Table 1.

  According to Table 1, the battery yield can be significantly improved from 59% to 74% by pre-annealing the substrate at 230 ° C. That is, conventionally, when various battery configuration patterns are formed on the base material 1, deformation due to thermal contraction of the base material occurs, and a short circuit occurs due to the occurrence of pattern deviation. It has been found that the product yield can be greatly improved by stopping the introduction of the insulating resin layer constituting the base material 1 into the production line while accepting it, and pre-annealing it before entering the battery production line.

Although the embodiment of the present invention is as described above, it should be considered that there are other modifications as follows.
(1) Although an all-solid lithium battery has been described as the battery, the battery is not limited to an all-solid lithium battery, and may be a liquid electrolyte or an electrolyte containing an ion conductive polymer. Further, the battery is not limited to the lithium battery, but may be other types of batteries, and may be a secondary battery or a primary battery.
(2) The essence of the present invention is that the substrate is not put into the battery production line as received, but is pre-annealed at a sufficiently high temperature to release the processing energy and then put into the battery production line. Therefore, by applying the manufacturing method according to the present invention, the battery according to the present invention, in particular, the deformation occurrence temperature may not be obtained from the measurement technique in the state of the battery (product). Currently, in future manufacturing processes, when assembling the battery, the processing energy may be released by another form of processing such as “ironing” because it undergoes a sealing process such as thermocompression bonding. . In addition, even a battery manufactured by a conventional manufacturing method that does not perform pre-annealing may be heated to a high temperature close to the pre-annealing temperature in the steps after the metal pattern growth in the future. . However, even in those cases, the batteries manufactured by the conventional manufacturing method have a high risk of being short-circuited (inherent), while the batteries manufactured by the manufacturing method of the present invention have a small risk of short-circuiting. ,it is obvious.
(3) In the battery of the present invention and the manufacturing method thereof, it should be noted that the melting point of the insulating resin constituting the base material is not limited at all in the widest range of the present invention. When the melting point of the insulating resin is a problem, in the production method of the present invention, the pre-annealing temperature is more preferably 170 ° C. or higher and (melting point of insulating resin−80) ° C. or higher. The melting point of the insulating resin satisfying this preferable range is limited to 250 ° C. or higher. However, most widely, the above limitation is not imposed on the melting point of the insulating resin in the battery manufacturing method of the present invention. In the battery of the present invention, the melting point of the insulating resin is not limited at all because the processing structure disappearance temperature or deformation occurrence temperature is not at least (the melting point of the insulating resin −80) ° C. or lower.

  Although the embodiments of the present invention have been described above, the embodiments and examples of the present invention disclosed above are merely examples, and the scope of the present invention is limited to these embodiments. It is not limited. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  According to the battery of the present invention and the manufacturing method thereof, a battery for a portable device with high reliability and low risk of short-circuiting can be manufactured with high productivity by a simple manufacturing process.

It is a perspective view which shows the battery main-body part in Embodiment 1 of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which follows the III-III line of FIG. It is a figure which shows the metal pattern on a base material. It is a figure which shows the thermal history of the battery manufacturing process in Embodiment 1 of this invention. It is a figure which shows the battery main-body part in Embodiment 2 of this invention. It is sectional drawing which follows the VII-VII line of FIG. It is sectional drawing which follows the VIII-VIII line of FIG. It is a figure which shows the battery main-body part in Embodiment 3 of this invention. It is sectional drawing which follows the XX line of FIG. It is a figure which shows the relationship between the shrinkage | contraction degree and heating temperature in Example 1. FIG. 6 is a view showing a test body of an example of the present invention in Example 2. FIG. 6 is a view showing a test sample of a comparative example in Example 2. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Base material (insulating resin layer, PPS sheet), 2 Metal (Ni) pattern (positive side current collection layer), 3 Positive electrode layer, 4 Electrolyte layer, 5 Negative electrode layer, 6 Negative side current collection layer, 10 Battery body part.

Claims (12)

A method for producing a battery using an insulating resin layer as a substrate,
Before forming any thin film of the battery on the insulating resin layer, the insulating resin layer is pre-annealed at a temperature exceeding 170 ° C. (melting point of the insulating resin −10) ° C. or less. Method.   The battery manufacturing method according to claim 1, wherein the insulating resin layer is heated to (melting point of the insulating resin−80) ° C. or higher.   The battery manufacturing method according to claim 1 or 2, wherein after the pre-annealing treatment of the insulating resin layer, surface heating is performed from the surface side of the insulating resin layer or the battery intermediate product.   The pre-annealing of the insulating resin layer is followed by heating the intermediate product of the battery to a temperature lower than the heating temperature of the pre-annealing during the manufacturing process of the battery. The manufacturing method of the battery as described.   The method for manufacturing a battery according to claim 1, wherein the metal pattern is formed in a comb-like pattern.   The method of manufacturing a battery according to claim 4, wherein the direction of the comb teeth of the comb-like pattern is a direction intersecting with the width direction of the insulating resin layer.   A battery manufactured by the method for manufacturing a battery according to claim 1. A battery using an insulating resin layer as a base material,
Comprising a metal pattern located on the insulating resin layer;
When the battery body is heated to a predetermined temperature of (the melting point of the insulating resin −10) ° C. or less, the deformation occurrence temperature at which deformation such as warpage occurs is larger than in the initial state of the battery body. When obtained, the battery has a deformation occurrence temperature that is not in a range of at least less than (the melting point of the insulating resin −80) ° C. A battery using an insulating resin layer as a base material,
Comprising a metal pattern located on the insulating resin layer;
When the insulating resin layer is heated to a predetermined temperature of (the melting point of the insulating resin −10) ° C. or lower, the processed tissue disappearance temperature is higher than the initial state of the battery body. A battery characterized in that, when determined, the processed tissue disappearance temperature is not at least in the range of less than (melting point of the insulating resin −80) ° C.   10. The battery according to claim 8, wherein, in the cross section of the insulating resin layer, the processed structure does not remain in an inclined shape that is small on the front side where the metal pattern is located and large on the back side.   The battery according to claim 7, wherein the metal pattern is a comb-like pattern.   The battery according to claim 11, wherein the direction of the comb teeth of the comb-like pattern is a direction intersecting with a width direction of the insulating resin layer.

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