JP2008192547A - Positive electrode plate, manufacturing method thereof, battery, manufacturing method thereof, vehicle, and battery-mounted equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a positive electrode plate, along with its manufacturing method, of high conductivity, a battery, along with its manufacturing method, using the positive electrode plate, whose output and energy density are improved using it, a vehicle on which the battery is mounted, and battery-mounted equipment on which the battery is mounted. <P>SOLUTION: The positive electrode plate 20 is composed of a first main surface 20a and second main surface 20b, and is used as a positive electrode plate 20 for a positive electrode of a battery 1. It comprises many active particles 22 which are granular and made from positive electrode active material, and a positive electrode plate body 21 which is of metal and covers at least a part of a surface 22S of the active particles 22, while holding the active particles 22. The active particles 22 are exposed to at least either the first main surface 20a or the second main surface 20b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a positive electrode plate, a battery including the positive electrode plate, a vehicle on which the battery is mounted, a battery-mounted device, a method for manufacturing the positive electrode plate, and a method for manufacturing the battery.

As a positive electrode plate used for a battery such as a lithium ion secondary battery, for example, a plate obtained by applying a positive electrode active material to a metal foil is known. Such a positive electrode plate is formed by coating a metal foil with a binder and a conductive material kneaded together with a positive electrode active material.
In addition, as the positive electrode plate, an aluminum nonwoven fabric formed by melt spinning a metal fiber mainly composed of aluminum and having a three-dimensional network structure is used as a positive electrode current collector, and a positive electrode active material and a binder are added thereto. Also known are those obtained by applying and pressure-bonding a kneaded mixture of a conductive agent (see Patent Document 1).

JP 2001-155739 A

  By the way, in the thing using the above-mentioned aluminum nonwoven fabric, since the positive electrode active material of a particle shape is carry | supported three-dimensionally by several metal fiber, the adhesiveness of a positive electrode active material can be improved. However, even in this case, a binder and a conductive agent are used to support the positive electrode active material on the aluminum nonwoven fabric. Therefore, the binder acts as a resistor between the positive electrode current collector and the positive electrode active material constituting the positive electrode member, and the conductivity between them decreases. Furthermore, since the binder and the conductive agent are also included in the volume and weight of the positive electrode member, there is a problem that the volume and weight of the positive electrode plate are increased.

Further, in the battery using the positive electrode member described above, the output is small even in the initial use because the internal resistance value of the battery is large by the amount of the resistor by the binder of the positive electrode current collector. Moreover, since the volume and weight of the positive electrode member occupying the whole battery are both large, the volume energy density and the weight energy density are also correspondingly low.
Furthermore, in vehicles and battery-equipped devices equipped with such batteries, there is a problem that the total volume or total weight of the battery occupying the entire vehicle or the entire battery-equipped device is increased.

  The present invention has been made in view of the present situation, and is a positive electrode plate having high conductivity, a battery using the same to improve output and energy density, a vehicle equipped with the battery, and the battery. An object is to provide a battery-equipped device. Moreover, it aims at providing the manufacturing method of a positive electrode plate, and the manufacturing method of the battery using a positive electrode plate.

  The solution is a plate having a first main surface and a second main surface, and is a positive electrode plate used for a positive electrode of a battery, having a particle shape, and a large number of active materials made of a positive electrode active material A positive electrode plate body made of a metal and covering at least a part of the surface of the active material particles and holding the active material particles, the first main surface and the second main surface It is a positive electrode plate formed by exposing the active material particles to at least one of them.

  In the positive electrode plate of the present invention, since at least a part of the active material particles is covered with the positive electrode plate body made of metal and directly held, the binder serving as a resistor is not interposed, and the positive electrode plate The conductivity between the electrode plate body and the active material particles is improved. Further, since the active material particles can be held without using a binder and a conductive agent, the volume and weight of the positive electrode plate can be reduced by the amount of the binder and the conductive agent. Therefore, if this positive electrode plate is used for a battery, battery output can be improved, and volume energy density and weight energy density can also be improved.

The positive electrode active material may be a solid lithium compound that can freely exchange lithium ions electrochemically. For example, LiCoO ₂ , LiNiO ₂ , LiMn ₂ O ₄ , LiFeO ₂ , Li ₅ FeO ₄ , Li ₂ MnO ₃ , LiFePO ₄ , LiV ₂ O ₄ , mixtures thereof and the like.
The firing temperature of the lithium compound as a positive electrode active material particles, for example, LiCoO ₂ is 700-960 ° C., LiNiO ₂ is 600~850 ℃, LiMn ₂ O ₄ is 750 to 850 ° C..

  Further, the material of the positive electrode plate body can be appropriately selected in consideration of the material of the positive electrode active material, the electrolyte used for the battery, the negative electrode, etc., but the volume specific resistance is small and the melting point is higher than the firing temperature of the positive electrode active material. Low metals are preferred. Specific examples include aluminum (melting point, 659 ° C.).

  Yet another solution is a battery using the positive electrode plate described above.

  In the battery of the present invention, a positive electrode plate composed of the above active material particles and a positive electrode plate body is used. Therefore, since the electrical conductivity between the positive electrode plate body and the active material particles in the positive electrode plate is high, the internal resistance of the battery can be reduced and the battery output can be improved. In addition, the volume and weight of the battery can be reduced.

The battery may be a battery using the above-described positive electrode plate. For example, a battery including a negative electrode plate supporting a negative electrode active material in addition to the positive electrode plate, and a separator interposed therebetween. Is mentioned. Therefore, for example, a stacked battery in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators, or a belt-like positive electrode plate and a belt-like negative electrode plate via a belt-like separator. Examples include a wound type battery.
In addition, as the separator, the positive electrode plate and the negative electrode plate are arranged apart from each other, and are composed of fibers and the like, and can contain an electrolyte solution inside and on the surface, and also use a solid electrolyte body Also included are those that play the role of electrolyte along with separation.

  Another solution is a vehicle equipped with the above-described battery.

  In the vehicle of the present invention, since the above-described battery is mounted, a small or small number of batteries are sufficient, and the total volume and total weight of the battery can be reduced.

  The vehicle equipped with the battery may be any vehicle that uses electric energy from the battery for all or a part of its power source, such as an electric vehicle, a hybrid electric vehicle, a forklift, an electric wheelchair, an electrically assisted bicycle, Electric scooters and railway vehicles are examples.

  Still another solution is a battery-equipped device equipped with the above-described battery.

  In the battery-mounted device of the present invention, since the above-described battery is mounted, a small or small number of batteries are sufficient, and the battery-mounted device with a reduced total volume and total weight of the battery can be obtained.

  The battery-equipped device may be any device equipped with a battery and using it as at least one of the energy sources. For example, various types of battery-driven devices such as personal computers, mobile phones, and battery-powered electric tools. Household appliances, office equipment, and industrial equipment.

  Another solution is a particle mixing step of mixing a large number of active material particles having a particle shape and made of a positive electrode active material into a metal melted at a temperature lower than the firing temperature of the positive electrode active material, A metal lump forming step of cooling and solidifying the metal mixed with active material particles to form a metal lump, and rolling the metal lump to form a plate having the first main surface and the second main surface; And a rolling step for forming a positive electrode plate holding the active material particles.

In the method for producing a positive electrode plate of the present invention, first, active material particles are mixed into the metal melted in the particle mixing step. The temperature of the metal at this time is set lower than the firing temperature of the positive electrode active material. Thereby, even if the active material particles are mixed in the molten metal, the characteristics of the positive electrode active material can be maintained.
Furthermore, the positive electrode plate that has undergone the metal lump formation step and the rolling step is a metal that functions as a positive electrode current collector than a conventional positive electrode plate in which a binder is present, since the active material particles are in direct contact with the metal. The electric resistance generated between the active material particles and the active material particles is lowered, and the conductivity is improved. Furthermore, the volume and weight of the positive electrode plate can be reduced by the amount that the binder and the conductive agent for holding the active material particles are unnecessary.

  Furthermore, in the method for manufacturing a positive electrode plate described above, after the rolling step, the metal exposed on at least one of the first main surface and the second main surface of the positive electrode plate is melted, A positive electrode plate manufacturing method including a melting step for increasing the exposed area of the substance particles is preferable.

  In the positive electrode plate manufacturing method of the present invention, the exposed area of the active material particles is increased in the melting step. Therefore, the active material particles or the surface of the active material particles that did not contribute to the battery reaction before dissolution can be newly used for the battery reaction, so the battery capacity is increased by increasing the amount of lithium ions in the battery. Can be made. Furthermore, since the weight of the metal in the positive electrode plate can be reduced by this melting, the weight of the positive electrode plate can be further reduced.

  In addition, as a means to melt | dissolve the metal which forms the 1st main surface and 2nd main surface of a positive electrode plate, the process immersed in the solution of either an acid or a base, an electrolysis process etc. are mentioned, for example.

  Furthermore, another means for solving the problem is that at least one of the first plate main surface and the second plate main surface of the plate-shaped metal plate having the first plate main surface and the second plate main surface is made of a positive electrode active material. A softening step of softening at a temperature lower than the firing temperature to form a softened surface, and after arranging a large number of active material particles having a particle shape and the positive electrode active material on the softened surface of the metal plate, the active material And a particle pushing step of pushing in toward the inside of the metal plate while maintaining the shape of the particles.

In the method for producing a positive electrode plate of the present invention, in the softening step, at least one of the first plate main surface and the second plate main surface of the metal plate is softened by heat, and the shape of the active material particles in the particle pushing step The first plate main surface or the second plate main surface is pushed toward the inside while maintaining the above. The temperature of the softened surface of the metal plate at that time is lower than the firing temperature of the positive electrode active material. For this reason, the active material particle pushed in from this softened surface can maintain the characteristic.
In the particle pushing step, the active material particles are pushed from the softened surface toward the inside of the metal plate, so that any pushed active material particles are exposed to the first plate main surface or the second plate main surface of the metal plate. Thus, any active material particles can contribute to the battery reaction. Therefore, all the active material particles can be used for the battery reaction without waste. Further, the battery capacity can be increased by increasing the amount of lithium ions in the battery.
Furthermore, since the metal plate and the active material particles are in direct contact with each other in the positive electrode plate manufactured by the manufacturing method of the present invention, the electrical resistance generated therebetween is lowered and the conductivity is improved. Further, since no binder or conductive agent is required, the volume and weight of the positive electrode plate can be reduced accordingly.
The temperature of the softening surface is a temperature at which the active material particles soften to a state where the active material particles can maintain their shape when the active material particles are pushed into the first plate main surface or the second plate main surface of the metal plate. Therefore, the temperature of the softened surface is selected according to the material of the metal plate and the material of the active material particles.

  Yet another solution is a method for manufacturing a battery including a positive electrode plate, wherein the positive electrode plate is manufactured by the above-described method for manufacturing a positive electrode plate.

  In the battery manufacturing method of the present invention, the above-described positive electrode plate manufacturing method is used for manufacturing the positive electrode plate. Therefore, the resistance generated in the positive electrode plate is reduced, and as a result, the internal resistance of the entire battery can be reduced. Thereby, a battery with improved battery output can be manufactured.

(Embodiment 1)
Next, Embodiment 1 of the present invention will be described with reference to the drawings.
First, the positive electrode plate 20 according to the first embodiment will be described. 1A is a perspective view of the positive electrode plate 20, and FIG. 1B is a cross-sectional view thereof (a cross section including AA in FIG. 1A).
The positive electrode plate 20 according to the first embodiment has a flat plate shape having a first main surface 20a and a second main surface 20b, and a thickness TH1 between the first main surface 20a and the second main surface 20b is 55 μm. is there. The positive electrode plate 20 includes a positive electrode plate main body 21 and active material particles 22 that are dispersed and arranged inside the positive electrode plate main body 21. Among these, the positive electrode plate main body 21 is made of aluminum and has a plate shape having a first main body main surface 21a and a second main body main surface 21b. The active material particles 22 have a particle shape with an average particle diameter of 20 μm and are made of a positive electrode active material LiMn ₂ O ₄ . The active material particles 22 are held by the positive electrode plate body 21 by covering at least a part of the surface 22S with the positive electrode plate body 21. Therefore, among the active material particles 22, some of the surface 22 </ b> S whose exposed surface 22 </ b> H is exposed to the outside from the first main body main surface 21 a or the second main body main surface 21 b of the positive electrode plate main body 21. is there. In the present embodiment, the active material particles 22 may include all the surfaces 22 </ b> S embedded in the positive electrode plate body 21.

FIG. 2 is a cross-sectional view showing a conventional positive electrode plate PP. The conventional positive electrode plate PP includes a metal foil PF and an active material layer PL. Specifically, the conventional positive electrode plate PP includes active material particles PA made of LiMn ₂ O _{4 as} a positive electrode active material on the first main surface PFa and the second main surface PFb of a metal foil PF made of flat aluminum. And an active material layer PL (for example, active material particles PA: binding agent AM: conducting agent CM = 8: 1: 1) in a weight ratio. . For example, polyvinylidene fluoride resin is used for the binder AM, and acetylene black is used for the conductive agent CM.
Thus, in the conventional positive electrode plate PP, the binder AM and the conductive agent CM are interposed between the metal foil PF and the active material particles PA.

  On the other hand, as described above, the positive electrode plate 20 of Embodiment 1 covers at least a part of the active material particles 22 with the positive electrode plate main body 21 and directly holds the active material particles 22. The conductivity between the positive electrode plate main body 21 and the active material particles 22 is improved without interposing an adhesive. Further, since the active material particles 22 can be held without using a binder and a conductive agent, the volume and weight of the positive electrode plate 20 can be reduced by the amount of the binder and the conductive agent.

  Next, the battery 1 according to the first embodiment will be described. 3A is a perspective view of the battery 1, FIG. 3B is a cross-sectional view thereof (a cross-section including BB in FIG. 3A), and FIG. 4 is an enlarged view of the battery cross-sectional view (C in FIG. 3). Part). The battery 1 is a laminated lithium ion secondary battery including a power generation element 10, a positive electrode tab 60, a negative electrode tab 70, and a laminate film 50. Among these, the electric power generation element 10 contains the positive electrode plate 20, the negative electrode plate 30, the separator 40, and the electrolyte solution which is not shown in figure. The positive electrode tab 60 is connected to a plurality of positive electrode plates 20 inside the battery, and the negative electrode tab 70 is connected to a plurality of negative electrode plates 30 inside the battery and inside the laminate film 50, and protrudes outside the laminate film 50. ing.

The plate-like positive electrode plates 20 and the negative electrode plates 30 are alternately stacked with separators 40 interposed therebetween. As the electrolytic solution, an organic electrolyte obtained by adding LiPF ₆ as a solute to a mixed organic solvent of EC (ethylene carbonate) and DEC (diethyl carbonate) is used.
Among these, the positive electrode plate 20 is the aforementioned positive electrode plate. On the other hand, the negative electrode plate 30 includes a metal foil 31 made of copper and a negative electrode active material layer 32 made of carbon applied to the first main surface 31a and the second main surface 31b.
The laminate film 50 has a metal foil 53 and a first resin layer 51 and a second resin layer 52 coated on both surfaces thereof. The two laminated films 50 sandwich the power generation element 10 and are thermally welded to each other to seal the power generation element 10.

  In the battery 1 according to the first embodiment, as described above, the positive electrode plate 20 including the positive electrode plate main body 21 and the active material particles 22 is used. Since the positive electrode plate 20 has high conductivity between the positive electrode plate main body 21 and the active material particles 22, the internal resistance of the battery 1 can be reduced and the battery output can be improved. Moreover, since the volume and weight of the positive electrode plate 20 are small, the volume and weight of the battery 1 can also be reduced.

Next, a method for manufacturing the battery 1 will be described.
First, the manufacturing method of the positive electrode plate 20 will be described with reference to FIGS.
The manufacturing method of the positive electrode plate 20 includes a particle mixing step, a metal lump forming step, a rolling step, and a melting step.
First, in the particle mixing step, 2.0 kg of aluminum 90 is charged into the crucible 810 of the melting furnace 800, and the aluminum 90 is heated to 700 ° C. by the heater 820 in an air atmosphere and thermally melted. Then, 2.0 kg of active material particles 22 made of LiMn ₂ O ₄ having an average particle diameter of 20 μm are charged and sufficiently stirred (FIGS. 5A and 5B). Since 700 ° C. is less than the firing temperature of the positive electrode active material which is LiMn ₂ O ₄ , the active material particles 22 (LiMn ₂ O ₄ ) can exist in the molten aluminum 90 while maintaining the characteristics.

  Next, in the metal lump forming step, the aluminum 90 containing the stirred active material particles 22 is cooled and solidified to cast the aluminum metal lump 91 (FIGS. 5C and 5D).

  Next, in the rolling process, the cast aluminum metal ingot 91 is rolled using a press roller 800 to produce a positive electrode plate 120 having a thickness TH2 of 55 μm (FIG. 7).

  In the positive electrode plate 120 manufactured by the above-described manufacturing method, since the positive electrode plate body 121 is in direct contact with the active material particles 22, the conventional positive electrode plate PP with the binder AM interposed (see FIG. 2). As a result, the electrical resistance generated between the positive electrode main body 121 functioning as the positive electrode current collector and the active material particles 22 is lowered, and the conductivity is improved. Furthermore, the volume and weight of the positive electrode plate 120 can be reduced.

  Although this positive electrode plate 120 can also be used as a positive electrode plate of a battery, the area of the exposed surface 22H of the active material particles 22 exposed on the first and second main surfaces 120a and 120b may be small. is there.

Therefore, the following melting step may be performed after the rolling step described above.
In the melting step, the first main body main surface 121a and the second main body main surface 121b of the positive electrode plate main body 121 out of the first main surface 120a and the second main surface 120b of the positive electrode plate 120 shown in FIG. The thickness TH3 is dissolved by corrosion treatment with nitric acid 900 at a concentration to increase the area of the exposed surface 22H of the active material particles 22 (see FIG. 8).

  By this melting step, the active material particles 22 that have not contributed to the battery reaction before melting or the surface 22S (exposed surface 22H) of the active material particles 22 can be newly used for the battery reaction. The battery capacity can be increased by increasing the amount of lithium ions inside. Furthermore, since the weight of the positive electrode plate main body 21 in the positive electrode plate 20 can be reduced by this dissolution, the weight of the positive electrode plate 20 can be further reduced. Thus, the positive electrode plate 20 is completed.

  In addition, in the manufacturing method of the battery 1 according to the first embodiment, since a method other than the manufacturing method of the positive electrode plates 120 and 20 may be used, a description thereof is omitted.

  According to the manufacturing method of the battery 1 of the first embodiment, the resistance generated in the positive electrode plate 120 or the positive electrode plate 20 can be reduced, so that the overall internal resistance of the battery 1 can be reduced. Thereby, the battery 1 which improved the battery output can be manufactured.

Next, the vehicle 500 using the battery 1 according to the first embodiment will be described. The vehicle 500 includes the battery 1 according to the first embodiment mounted by a known method. Specifically, as shown in FIG. 9, the hybrid electric vehicle is driven by using an engine 510, a front motor 520, and a rear motor 530 in combination. The vehicle 500 includes a vehicle body 570, an engine 510, a front motor 520, a rear motor 530, a cable 550, an inverter 560, and a battery pack 540 attached thereto. Battery pack 540 is attached to vehicle body 570 of vehicle 500. In the battery pack 540, although not shown in detail, a plurality of batteries 1 are electrically connected in series.
Thus, in this vehicle 500, since the battery 1 described above is used, it is sufficient to use a small or small number of batteries 1, and the total volume and total weight of the battery 1 (volume and weight of the battery pack 540) are reduced. The vehicle 500 can be used.

Further, a battery-mounted device 600 using the battery 1 according to the first embodiment will be described. The mobile phone 600 is a battery in which the battery 1 manufactured by the above-described method is mounted by a known method. Specifically, as shown in FIG. 10, a battery-mounted device having a battery pack 610 and a main body 620. The battery pack 610 is accommodated in the main body 620 of the mobile phone 600, and the battery 1 is accommodated in the battery pack 610.
Since the above-described battery 1 is also used in the cellular phone 600, a small or small battery 1 is sufficient, and the battery-equipped device 600 in which the volume and weight of the battery 1 (battery pack 610) are reduced can be obtained.

(Embodiment 2)
Next, the positive electrode plate 220 according to the second embodiment will be described. 11 is a cross-sectional view of the positive electrode plate 220 (cross-section EE in FIG. 13).
The positive electrode plate 220 according to the second embodiment has a first main surface 220a and a second main surface 220b, and a thickness TH4 between the first main surface 220a and the second main surface 220b is 55 μm. is there. The positive electrode plate 220 includes a positive electrode plate main body 221 and active material particles 22 similar to those in the first embodiment that are dispersed and disposed on the surface portion. Among these, the positive electrode plate main body 221 is made of aluminum, and is a plate-like aluminum foil having a first main body main surface 221a and a second main body main surface 221b. Further, as described above, the active material particles 22 have a particle shape with an average particle diameter of 20 μm and are made of LiMn ₂ O _{4 as} a positive electrode active material. The active material particles 22 are pushed inward from the first main body main surface 221a or the second main body main surface 221b of the positive electrode plate main body 221, so that the positive electrode plate main body 221 covers a part of the surface 22S. Thus, the positive electrode plate main body 221 holds the positive electrode plate. In the second embodiment, for any active material particle 22, the exposed surface 22H of the surface 22S is exposed to the outside of the first main body main surface 221a or the second main body main surface 221b of the positive electrode plate main body 221. is doing.

  As described above, the positive electrode plate 220 of the second embodiment covers a part of the active material particles 22 with the positive electrode plate main body 221 and directly holds the active material particle 22, so that the binder serving as a resistor is present. The conductivity between the positive electrode plate main body 221 and the active material particles 22 is improved without being interposed. Further, since the active material particles 22 can be held without using a binder and a conductive agent, the volume and weight of the positive electrode plate 220 can be reduced by the amount of the binder and the conductive agent. Furthermore, any active material particle 22 is in a state that can contribute to the battery reaction.

  Next, the battery 201 according to the second embodiment will be described with reference to FIGS. 3 and 12. As shown in FIG. 3, the battery 201 is a stacked lithium ion secondary battery including a power generation element 210, a positive electrode tab 60, a negative electrode tab 70, and a laminate film 50, as with the battery 1 according to the first embodiment. Among these, the power generation element 210 includes a positive electrode plate 220, a negative electrode plate 30, a separator 40, and an electrolyte solution (not shown). Further, the positive electrode tab 60 is connected to a plurality of positive electrode plates 220 inside the battery, and the negative electrode tab 70 is connected to a plurality of negative electrode plates 30 inside the battery and inside the laminate film 50, and protrudes outside the laminate film 50. ing.

FIG. 12 is an enlarged cross-sectional view of the battery 201 (C portion in FIG. 3). The plate-like positive electrode plates 220 and the negative electrode plates 30 are alternately stacked with separators 40 interposed therebetween.
Among these, the negative electrode plate 30, the separator 40, the laminate film 50, and the electrolytic solution are the same as those of the battery 1 according to the first embodiment.

  The battery 201 according to the second embodiment uses the positive electrode plate 220 including the positive electrode plate main body 221 and the active material particles 22 described above. Since the positive electrode plate 220 has high conductivity between the positive electrode plate main body 221 and the active material particles 22, the internal resistance of the battery 201 can be reduced and the battery output can be improved. Further, the volume and weight of the battery 201 can be reduced. Furthermore, all the active material particles 22 can be utilized for the battery reaction without waste, and the battery capacity can be increased by increasing the amount of lithium ions in the battery 201.

Next, a method for manufacturing the positive electrode plate 220 of the second embodiment will be described with reference to FIG. First, as shown in the upper part of FIG. 13, a metal plate 291 made of aluminum, having a long first plate main surface 291a and a second plate main surface 291b, and having a thickness TH5 of 50 μm is prepared. The metal plate 291 is fed by the roller 840, and the first plate main surface 291a and the second plate main surface 291b are heated by the heater 850 and softened to form the first softened surface 291c and the second softened surface 291d, respectively. .
The temperature of the softened surfaces 291c and 291d is such that the first softened surface 291c (first plate main surface 291a) and the second softened surface (second plate main surface 291b) are active material particles 22 as described below. When the is pressed, the active material particles 22 are set to a temperature at which the active material particles 22 are softened to a state where the active material particles 22 can be press-fitted while maintaining their shapes without deformation. In addition, the first softened surface 291c and the second softened surface 291d are set to a temperature lower than the firing temperature of the active material particles 22, specifically, the positive electrode active material LiMn ₂ O ₄ . This is because the active material particles 22 can maintain their characteristics even after being pushed in. In the second embodiment, the temperature is approximately 600 ° C.

Next, in the particle pushing step, the active material particles 22 are dispersed using the hopper 860 on the first softened surface 291c and the second softened surface 291d of the metal plate 291.
Next, the active material particles 22 are pushed by the press roller 870 toward the inside of the metal plate 291 from the first softened surface 291c and the second softened surface 291d. As described above, since the temperatures of the first softened surface 291c and the second softened surface 291d are adjusted, the active material particles 22 are not crushed and deformed when the active material particles 22 are pushed in. The interval between the press rollers 870 is adjusted to a value slightly larger than the thickness TH5 of the metal plate 291. Thus, the positive electrode plate 220 is completed.

  The positive electrode plate 220 manufactured by the manufacturing method of the second embodiment is supported on the positive electrode plate body 221 that is the metal plate 291 in a state where all of the active material particles 22 can contribute to the battery reaction. The substance particles 22 can be used for battery reaction without waste. Furthermore, since the positive electrode plate main body 221 (metal plate 291) and the active material particles 22 are in direct contact with each other, the electrical resistance generated therebetween is reduced and the conductivity is improved. Further, since no binder or conductive agent is required, the volume and weight of the positive electrode plate 220 can be reduced accordingly.

  Furthermore, the battery 201 according to the second embodiment is manufactured using a public method except that the positive electrode plate 220 is manufactured by the above-described manufacturing method.

Furthermore, this battery 201 can also be mounted on the vehicle 501 (battery pack 541), similarly to the vehicle 500 (battery pack 540) using the battery 1 of the first embodiment.
Since the vehicle 501 includes the battery pack 541 using the above-described battery 201, a small or small battery 201 is sufficient, and the total volume and weight of the battery 201, and thus the volume and weight of the battery pack 541 are reduced. can do.

In addition, the battery 201 can be mounted on the mobile phone 601 (see FIG. 10), similarly to the mobile phone 600 using the battery of Embodiment 1.
Since the mobile phone 601 is equipped with the battery pack 611 using the above-described battery 201, a small or small battery 201 is sufficient, and the volume and weight of the battery 201, and hence the mobile phone 601 can be reduced. .

  In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the first and second embodiments, and can be appropriately modified and applied without departing from the gist thereof. Needless to say.

  For example, as the first and second embodiments, the batteries 1 and 201 are lithium ion secondary batteries. However, the present invention is not limited to lithium ion secondary batteries, and any battery having a power generation element using a positive electrode plate may be used. It can be applied to any type of battery.

It is a figure which shows the positive electrode plate 20 concerning Embodiment 1, (a) is a perspective view, (b) is AA sectional drawing. It is sectional drawing which shows the schematic example of the conventional positive electrode plate PP. It is a figure which shows the batteries 1 and 201 concerning Embodiment 1 and 2, (a) is a perspective view, (b) is BB sectional drawing. FIG. 3 is a partial enlarged cross-sectional view (part C of FIG. 3) of the battery 1 according to the first embodiment. It is explanatory drawing for demonstrating a particle mixing process and a metal lump formation process among the manufacturing methods of the positive electrode plates 120 and 20 concerning Embodiment 1, (a) is injection | throwing-in of the active material particle 22, (b) is. Agitation of the active material particles 22, (c) shows cooling of the metal in which the active material particles 22 are dispersed, and (d) shows the state of removal. It is explanatory drawing for demonstrating a rolling process among the manufacturing methods of the positive electrode plate concerning Embodiment 1. FIG. It is sectional drawing (DD cross section of FIG. 6) which shows the positive electrode plate 120 formed by rolling. It is sectional drawing of the positive electrode plate 20 after a melt | dissolution process. It is explanatory drawing which shows the vehicles 500 and 501 (hybrid electric vehicle) carrying the batteries 1 and 201 concerning Embodiment 1 and 2. FIG. It is explanatory drawing which shows the mobile telephones 600 and 601 carrying the batteries 1 and 201 concerning Embodiment 1 and 2. FIG. FIG. 4 is a cross-sectional view of a positive electrode plate 220 according to a second embodiment. FIG. 6 is a partial enlarged cross-sectional view (part C of FIG. 3) of the battery 201 according to the second embodiment. It is explanatory drawing for demonstrating the softening process and particle pushing process of the manufacturing method of the positive electrode plate 220 concerning Embodiment 2. FIG.

Explanation of symbols

1,201 Batteries 20, 120, 220 Positive electrode plates 20a, 120a, 220a First main surfaces 20b, 120b, 220b Second main surfaces 21, 121, 221 Positive electrode plate main body 22 Active material particles 22S Surface 90 Aluminum (metal)
91 Metal lump 291 Metal plate 291a First plate main surface 291b Second plate main surface 291c First softened surface 291d Second softened surface 500, 501 Vehicle 600, 601 Mobile phone (battery-equipped device)

Claims (8)

A plate having a first main surface and a second main surface, a positive electrode plate used for a positive electrode of a battery,
A number of active material particles having a particle shape and made of a positive electrode active material;
A positive electrode plate body made of metal, covering at least part of the surface of the active material particles and holding the active material particles, and
The active material particles are exposed on at least one of the first main surface and the second main surface.
Positive electrode plate. A battery comprising the positive electrode plate according to claim 1. A vehicle equipped with the battery according to claim 2. The battery mounting apparatus which mounts the battery of Claim 2. A particle mixing step of mixing a large number of active material particles having a particle shape and made of a positive electrode active material into a metal melted at a temperature lower than the firing temperature of the positive electrode active material,
A metal lump forming step of cooling and solidifying the metal mixed with the active material particles to form a metal lump,
Rolling the metal lump to form a positive electrode plate having the first main surface and the second main surface and holding the active material particles with the metal. Production method. It is a manufacturing method of the positive electrode plate according to claim 5,
After the rolling step, a melting step of melting the metal exposed on at least one of the first main surface and the second main surface of the positive electrode plate and increasing an exposed area of the active material particles is provided. A manufacturing method of a board. At least one of the first plate main surface and the second plate main surface of the plate-shaped metal plate having the first plate main surface and the second plate main surface is softened at a temperature lower than the firing temperature of the positive electrode active material. Softening process to make the surface soft,
Particle indentation in which a large number of active material particles having a particle shape and made of the positive electrode active material are arranged on the softened surface of the metal plate and then pushed toward the inside of the metal plate while maintaining the shape of the active material particles And a method for producing a positive electrode plate. A method for producing a battery comprising a positive electrode plate,
The manufacturing method of the battery which manufactures the said positive electrode plate with the manufacturing method of the positive electrode plate of any one of Claims 5-7.

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