Electrochemical device
An electrochemical device having an electrode matrix including a multilayer structure laminating positive and negative electrodes with a separator interposed therebetween; wherein at least one of the positive and negative electrodes has a resistance control layer at least at an edge part exposed when the separator thermally shrinks on a surface on the separator side; and wherein the resistance control layer has a resistance value as a total resistance value of the electrode matrix falling in such a range that an estimated internal short circuit current between the positive and negative electrodes is equivalent to 0.09 C to 1 C.
1. An electrochemical device having an electrode matrix including a multilayer structure laminating positive and negative electrodes with a separator interposed therebetween;
wherein at least one of the positive and negative electrodes has a resistance control layer at least at an edge part exposed when the separator thermally shrinks on a surface on the separator side; and
wherein the resistance control layer has a resistance value as a total resistance value of the electrode matrix falling in such a range that an estimated internal short circuit current between the positive and negative electrodes is equivalent to 0.09 C to 1 C.
2. An electrochemical device according to claim 1 , wherein each of the positive and negative electrodes has the resistance control layer.
3. An electrochemical device according to claim 1 , wherein one of the positive and negative electrodes has the resistance control layer.
4. An electrochemical device according to claim 1 , wherein the resistance control layer is a layer containing carbon black, a binder, and a ceramic particle.
5. An electrochemical device according to claim 4 , wherein the ratio of the content of the carbon black to a combined amount of the binder and ceramic particle in the resistance control layer is 1:99 to 10:90 in terms of mass ratio.
6. An electrochemical device according to claim 1 , wherein the resistance control layer is a layer made of tungsten, tantalum, nickel-chromium alloys, or a ceramic material.
7. An electrochemical device according to claim 1 , wherein the separator is constituted by a polyolefin, a polyamide imide having a surface coated with a polyacrylonitrile, a drawn polyolefin, a nonwoven-type polyolefin, a nonwoven-type polyacrylonitrile, a nonwoven-type polyamide imide, or a mixture or combination thereof.
8. An electrochemical device according to claim 1 , wherein at least one of the positive and negative electrodes is accommodated within the separator shaped like a bag having an opening.