An electrochemical apparatus including an electrode assembly including a first electrode plate, a second electrode plate and a separator disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a current collector and an active material layer, the current collector includes a first zone and a second zone, the second zone is provided with an active material layer, the first zone includes a third zone and a fourth zone, the third zone is arranged in overlap with the separator, and the fourth zone is provided with a conductive layer. The conductive layer is disposed in a zone of the current collector that has no active material layer disposed thereon and that does not overlap the separator.

According to the present disclosure, it is possible to inhibit the electrically conductive foreign substance from falling off and being peeled off from the electrode plate that has been already manufactured, so as to contribute in improving the safety property of the secondary battery. The manufacturing method of the electrode plate herein disclosed includes a precursor preparing step for preparing an electrode precursor 20A including an active substance provided area A1 in which an electrode active substance layer 24 is provided on a surface of the electrode substrate 22 and including a substrate exposed area A2 in which the electrode active substance layer 24 is not provided and the electrode substrate 22 is exposed, an active substance provided area cutting step for cutting the active substance provided area A1 by a pulse laser, and a substrate exposed area cutting step for cutting the substrate exposed area A2 by the pulse laser. Then, the frequency of the pulse laser in the substrate exposed area cutting step is made to be larger than the frequency of the pulse laser in the active substance provided area cutting step, and the lap rate of the pulse laser in the substrate exposed area cutting step is made to be equal to or more than 90%. According to the manufacturing method of the electrode plate as described above, it is possible to inhibit the electrically conductive foreign substance from falling off and being peeled off from the electrode plate that has been already manufactured, and thus it is possible to contribute in improving the safety property of the secondary battery.

According to the present disclosure, it is possible to inhibit the electrically conductive foreign substance from falling off and being peeled off from the electrode plate that has been already manufactured, so as to contribute in improving the safety property of the secondary battery. The manufacturing method of the electrode plate herein disclosed includes a precursor preparing step for preparing an electrode precursor 20A including an active substance provided area A1 in which an electrode active substance layer 24 is provided on a surface of the electrode substrate 22 and including a substrate exposed area A2 in which the electrode active substance layer 24 is not provided and the electrode substrate 22 is exposed, an active substance provided area cutting step for cutting the active substance provided area A1 by a pulse laser, and a substrate exposed area cutting step for cutting the substrate exposed area A2 by the pulse laser. Then, the frequency of the pulse laser in the substrate exposed area cutting step is made to be larger than the frequency of the pulse laser in the active substance provided area cutting step, and the lap rate of the pulse laser in the substrate exposed area cutting step is made to be equal to or more than 90%. According to the manufacturing method of the electrode plate as described above, it is possible to inhibit the electrically conductive foreign substance from falling off and being peeled off from the electrode plate that has been already manufactured, and thus it is possible to contribute in improving the safety property of the secondary battery.

Provided is a secondary battery. The secondary battery includes a can, an electrode assembly in the can, a collector plate electrically connected to the electrode assembly, and a terminal having a coupling part mechanically coupled to the collector plate by a pressure, electrically connected to the collector plate, and electrically connected to the electrode assembly.

Provided is a secondary battery. The secondary battery includes a can, an electrode assembly in the can, a collector plate electrically connected to the electrode assembly, and a terminal having a coupling part mechanically coupled to the collector plate by a pressure, electrically connected to the collector plate, and electrically connected to the electrode assembly.

An electrode assembly is manufactured by a process. The electrode assembly comprises an anode sheet and an anode having improved stacking characteristics of an electrode based on a shoulder portion. The shoulder portion is solid. The shoulder portion is thicker than a conventional electrode tab and has no light reflection with the application of an active material when the electrode assembly is formed, including during notching, cutting of a single electrode, and stacking.

An electrode assembly is manufactured by a process. The electrode assembly comprises an anode sheet and an anode having improved stacking characteristics of an electrode based on a shoulder portion. The shoulder portion is solid. The shoulder portion is thicker than a conventional electrode tab and has no light reflection with the application of an active material when the electrode assembly is formed, including during notching, cutting of a single electrode, and stacking.

A secondary battery includes an outer package member, a battery device, and a heat-resistant member. The battery device is contained inside the outer package member. The heat-resistant member has an insulating property and is disposed between the outer package member and the battery device. The outer package member includes a container member and a closing member. The container member has an opening, and contains the battery device inside. The closing member closes the opening, and is welded to the container member. The battery device has an opposed surface and a side surface. The opposed surface is opposed to the closing member. The side surface is coupled to the opposed surface. The heat-resistant member covers from the opposed surface to the side surface.

A secondary battery includes an outer package member, a battery device, and a heat-resistant member. The battery device is contained inside the outer package member. The heat-resistant member has an insulating property and is disposed between the outer package member and the battery device. The outer package member includes a container member and a closing member. The container member has an opening, and contains the battery device inside. The closing member closes the opening, and is welded to the container member. The battery device has an opposed surface and a side surface. The opposed surface is opposed to the closing member. The side surface is coupled to the opposed surface. The heat-resistant member covers from the opposed surface to the side surface.

Provided is a lithium ion secondary battery including Li.sub.4Ti.sub.5O.sub.12 particles in a negative electrode active material layer and having both high heat generation suppressing performance during overcharging, and high storage stability in a high SOC region. The lithium ion secondary battery herein disclosed includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode has a positive electrode active material layer. The positive electrode active material layer includes Li.sub.3PO.sub.4 as a secondary material. The negative electrode has a negative electrode active material layer. The negative electrode active material layer includes Li.sub.4Ti.sub.5O.sub.12 as a secondary material. The Li.sub.3PO.sub.4 content in the positive electrode active material layer is 0.5 mass % or more and 5.0 mass % or less. The Li.sub.4Ti.sub.5O.sub.12 content in the negative electrode active material layer is 0.5 mass % or more and 5.0 mass % or less.