Electric double layer capacitor

A technology for electric double layer capacitors and batteries, which is applied in the directions of double layer capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of insufficient expansion of the electric double layer area.

Inactive Publication Date: 2006-11-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] On the other hand, since the expansion and contraction of the electrodes occur only in the stacking direction, in order to suppress the change in the amount of electrolyte in the separator, the expansion and contraction of the electrodes can be made by applying surface pressure on the main part of the large battery part It is reduced to about 10%, but when the expansion and contraction of the electrode are suppressed, since the electrolyte and the electrolyte do not enter the electrode, the expansion of the area of ​​the electric double layer is not sufficient, and the increase in the electrostatic capacity is maintained when compared with the existing activated carbon. Around 1.5 times

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Embodiment approach 1

[0058] figure 1 and figure 2 These are a cross-sectional view and a front view showing the structure of the electric double layer capacitor according to Embodiment 1 of the present invention, respectively. refer to figure 1 , 2 It can be seen that the battery (cell) section 9 is constituted by laminating a plurality of positive electrodes 6 a and negative electrodes 6 b facing each other with the porous separator 7 interposed therebetween. As the positive electrode 6a and the negative electrode 6b, activated carbon with a diameter of about 10 μm and nano-gate carbon are bonded with a fluorine-based resin such as PTFE (polytetrafluoroethylene) as a binder, and a layer with a thickness of several hundred μm can be used. .

[0059] The positive electrode 6a is formed on the positive electrode current collector plate 5a, and the negative electrode 6b is formed on the negative electrode current collector plate 5b. Aluminum foil can be used as the positive electrode current co...

Embodiment approach 2

[0077] Figure 6 For a perspective view showing the structure of the electric double layer capacitor according to Embodiment 2 of the present invention, a part of the case 1 and the electrolytic solution reservoir 8 are shown cut away. in addition, Figure 7 Sectioned by virtual plane 20 for schematic illustration Figure 6 A cross-sectional view showing the cross-sectional structure of the electric double-layer capacitor shown.

[0078] In the first embodiment described above, an example of a multilayer type electric double layer capacitor was described, such as Figure 6 , 7 As shown, the present invention is also applicable to wound type electric double layer capacitors.

[0079] The electric double layer capacitor of the winding type differs from the laminated type in that each sheet of the positive electrode 6a, the separator 7, and the negative electrode 6b is stacked and wound multiple times to form the battery part 9. The structure of the electric double layer cap...

Embodiment approach 3

[0082] Figure 8 It is a front view showing the structure of an electric double layer capacitor according to Embodiment 3 of the present invention. Such as Figure 8 As shown, the electric double layer capacitor according to Embodiment 3 has a case 101 , an electrolytic solution reservoir 104 and a battery unit 105 accommodated in the case 101 , and a positive terminal 102 and a negative terminal 103 . The electrolytic solution reservoir 104 is constituted by a plurality of electrolytic solution reservoirs 104a.

[0083] Figure 9 and Figure 10 These are a cross-sectional view and a perspective view showing the structures of the electrolytic solution reservoir 104 and the battery unit 105 in a state housed in the casing 101 , respectively. exist Figure 10 , for convenience of illustration, not shown in Figure 9 Separator 110 shown in . Such as Figure 9 , 10 As shown, the battery unit 105 has a structure in which a plurality of sets of positive electrodes 106 and n...

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Abstract

A porous electrolytic solution reservoir which is capable of being impregnated with an electrolytic solution is provided in an exterior case so as to make contact with a separator. The average diameter of the pores in the electrolytic solution reservoir is greater than the average diameter of pores in the separator. The electrolytic solution reservoir is impregnated with a predetermined amount of electrolytic solution, so that the occupation ratio of electrolytic solution within the pores in the separator becomes 50% or more when fully charged, and the occupation ratio of electrolytic solution within the pores in the electrolytic solution reservoir becomes 100% or less when fully discharged.

Description

technical field [0001] The present invention relates to electric double layer capacitors. Background technique [0002] Electric double-layer capacitors, as disclosed in Japanese Patent Application Laid-Open Publication No. 11-150042, are provided with polarized electrodes (positive and negative electrodes) facing each other across a separator, and utilize A device with an electric double-layer electrostatic capacitance formed on the surface. Electric double-layer capacitors are characterized by the fact that they can obtain a much larger electrostatic capacitance than ordinary capacitors such as aluminum capacitors, and are expected to be used in backup batteries for electronic equipment, power storage for home appliances and copiers, and idling for automobiles. It is widely used as a power supply for starting when the vehicle is stopped, a power supply for hybrid vehicles, and power storage for peak regulation and equalization of wind and solar power generation, and is us...

Claims

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Application Information

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IPC IPC(8): H01G11/00H01G11/10H01G11/12H01G11/14H01G11/22H01G11/24H01G11/38H01G11/42H01G11/52H01G11/54H01G11/78
Inventor 光田宪朗田熊良行竹村大吾久保一树三谷彻男宮本文行増田尚
Owner MITSUBISHI ELECTRIC CORP
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