An electrochemical energy storage apparatus, in particular a rechargeable lithium-ion battery, having at least one current collector device with at least one current conductor arm, and at least one energy storage cell which has at least one anode, one cathode and one separator. The separator touches the anode and the cathode at least in sections in, in each case, a separator contact area. The current conductor arm can be electrically conductively connected to, in each case, at least one anode or cathode by way of a current output conductor contact area. A surface normal on the current output conductor contact area and a surface normal on the separator contact area form an acute angle α. This angle α is selected from a range which is greater than 5°, with preference greater than 15°, preferably greater than 25° and particularly preferably greater than 35°, and furthermore the angle α is less than or equal to 90°, with preference less than 75°, preferably less than 65° and particularly preferably less than 45°.

A prismatic secondary battery has a problem of providing a highly reliable the prismatic secondary battery by securing both mechanical strength and electrical characteristics between a metal body to which a bus bar of an external terminal is welded and a connection terminal which is joined with the metal body.

In a prismatic secondary battery of the present invention to solve the above-described problem, external terminals of a positive electrode and a negative electrode are disposed on one surface of a prismatic battery container and a flat wound group is housed in the battery container. One external terminal has a connection terminal, which passes through the battery container and is electrically connected to the flat wound group and a metal body which is joined with the connection terminal, and joints between the connection terminal and the metal body include a mechanical joint and a metallurgical joint.

A battery includes a battery case, an external metallic member, an external resin member which is present between the battery case and the external metallic member, a heat transfer inhibiting portion configured to restrain heat transfer from the external metallic member to the external resin member, and a current collector member including an extending portion that extends from an inside of the battery case to an outside of the external metallic member, and a rivet portion that expands from the extending portion to a radially outer side and fixes the extending portion, the external metallic member, and the external resin member to the battery case. The rivet portion and the external metallic member include a weld bead that connects the rivet portion and the external metallic member with each other. The heat transfer inhibiting portion is provided on the axially inner side of the weld bead.

A highly-reliable electrical storage device element and electrical storage device, in each of which on predetermined regions of predetermined end surfaces of a laminate forming an electrical storage component, sprayed end surface electrodes each having a high bond strength to the laminate are provided.

A current collecting structure for which the installation space for current collecting plates is not increased more than necessary even if the number of electrodes to be stacked is increased to increase the capacity of a secondary battery is provided. Positive current collecting plates 41a to 41j constituting a positive current collecting plate stacking portion 27 are bent at bent portions 47a to 47j to constitute fixed portions 43a to 43j and welded portions 45a to 45j, respectively. The angles of the bent portions 47a to 47e are 80°, 90°, 100°, 110°, and 120°, respectively. The angles of the bent portions 47f to 47j are 120°, 110°, 100°, 90°, and 80°, respectively. Negative current collecting plates are also bent in the same manner.

The present invention provides a heat suppressing alkaline storage battery including a positive electrode lead having a downsized portion that incorporates a PTC thermistor. A battery includes a positive electrode lead having a first lead half body, a second lead half body, and a PTC thermistor, the first and second lead half bodies overlap end portions formed in a portion where the first and second lead half bodies overlap with each other, the overlap end portions being larger than the PTC thermistor as viewed from a plane and being in contact with the PTC thermistor, the PTC thermistor is fitted in a fitting recessed portion formed in the overlap end portion of the first lead half body, and an exposed portion of the PTC thermistor is covered with a protective material.

A rechargeable battery includes: an electrode assembly including a first electrode and a second electrode, a case configured to receive the electrode assembly, a first current collecting member including a first fuse unit coupled to the first electrode and having a cross-sectional area that is smaller than a cross-sectional area of a periphery of the first current collecting member, and a second current collecting member including a second fuse unit coupled to the second electrode and having a cross-sectional area that is smaller than a cross-sectional area of a periphery of the second current collecting member, in which the first fuse unit is configured to melt more quickly than the second fuse unit at a first current, and the second fuse unit is configured to melt more quickly than the first fuse unit at a second current that is lower than the first current.

A battery includes a cylindrical battery case and an electrode group including a positive electrode, a negative electrode, and a separator. The electrode group and the battery case define a space communicated from a top to a bottom, and one of the positive electrode and the negative electrode has a current collecting terminal that extends from the electrode group in a direction away from a center axis of the battery case and is in contact with a bottom surface of the battery case.

A battery includes a bottomed case of box shape housing a power-generating element, a lid component for the case, a terminal electrode provided outside the case and extending in the direction of the thickness of the lid component, a take-out electrode passing through the lid component, provided for taking out an electric power of the power-generating element to the outside of the case, and disposed at a position different from that of the terminal electrode within a plane including the lid component, and a connecting member connecting the terminal electrode and the take-out electrode and including a thinner portion allowing bending of the connecting member in response to an external force applied to the terminal electrode in the direction of the thickness of the lid component.

A secondary battery having improved safety includes an electrode assembly, a case, and a cap assembly. The electrode assembly has first and second non-coating portions. The case accommodates the electrode assembly. The cap assembly includes a cap plate coupled to the case, and first and second collector plates. In the secondary battery, the first and second non-coating portions and the first and second collector plates are connected or coupled by first and second lead tabs, respectively, and the first and/or second lead tabs include a fuse portion.