A battery module including: a battery stack of battery cells having opposite ends to which a plurality of electrode tabs are connected; end-side bus bar assemblies formed at opposite ends of the battery stack, respectively, and electrically connecting the electrode tabs of the battery cells; and a case accommodating the battery stack and the end-side bus bar assemblies.

A rechargeable battery jump starting device with a control switch backlight system. The control switch backlight system is configured to assist a user viewing the selectable positions of the control switch for selecting a particular 12V or 24V operating mode of the portable rechargeable battery jump starting device in day light, sunshine, low light, and darkness.

A rechargeable battery jump starting device with a control switch backlight system. The control switch backlight system is configured to assist a user viewing the selectable positions of the control switch for selecting a particular 12V or 24V operating mode of the portable rechargeable battery jump starting device in day light, sunshine, low light, and darkness.

In a metal negative electrode, a current collector includes a through-hole or a recess provided to extend from a front surface of a planar plate toward a back surface of the planar plate. A distance from a midpoint of a joining boundary to a point on a surface of the current collector is designated as a region dividing distance, the point defining a distance less than a maximum distance between the midpoint and a side or a surface of the current collector. In the current collector, a first region is a region defined by distances from the midpoint, the distances being a distance equal to the region dividing distance and distances greater than the region dividing distance, and, in the current collector, a second region is a region defined by distances from the midpoint that are less than the region dividing distance. A volume reduction ratio of the first region is greater than a volume reduction ratio of the second region, the volume reduction ratio of the first region being a ratio with respect to a volume of the first region determined assuming that the through-hole or the recess is not present, the volume reduction ratio of the second region being a ratio with respect to a volume of the second region determined assuming that the through-hole or the recess is not present.

In a metal negative electrode, a current collector includes a through-hole or a recess provided to extend from a front surface of a planar plate toward a back surface of the planar plate. A distance from a midpoint of a joining boundary to a point on a surface of the current collector is designated as a region dividing distance, the point defining a distance less than a maximum distance between the midpoint and a side or a surface of the current collector. In the current collector, a first region is a region defined by distances from the midpoint, the distances being a distance equal to the region dividing distance and distances greater than the region dividing distance, and, in the current collector, a second region is a region defined by distances from the midpoint that are less than the region dividing distance. A volume reduction ratio of the first region is greater than a volume reduction ratio of the second region, the volume reduction ratio of the first region being a ratio with respect to a volume of the first region determined assuming that the through-hole or the recess is not present, the volume reduction ratio of the second region being a ratio with respect to a volume of the second region determined assuming that the through-hole or the recess is not present.

Apparatus, systems, and methods described herein relate to safety devices for electrochemical cells comprising an electrode tab electrically coupled to an electrode, the electrode including an electrode material disposed on a current collector. In some embodiments, a fuse can be operably coupled to or formed in the electrode tab. In some embodiments, the fuse can be formed by removing a portion of the electrode tab. In some embodiments, the fuse can include a thin strip of electrically resistive material configured to electrically couple multiple electrodes. In some embodiments, the current collector can include a metal-coated deformable mesh material such that the current collector is self-fusing. In some embodiments, the fuse can be configured to deform, break, melt, or otherwise discontinue electrical communication between the electrode and other components of the electrochemical cell in response to a high current condition, a high voltage condition, or a high temperature condition.

Apparatus, systems, and methods described herein relate to safety devices for electrochemical cells comprising an electrode tab electrically coupled to an electrode, the electrode including an electrode material disposed on a current collector. In some embodiments, a fuse can be operably coupled to or formed in the electrode tab. In some embodiments, the fuse can be formed by removing a portion of the electrode tab. In some embodiments, the fuse can include a thin strip of electrically resistive material configured to electrically couple multiple electrodes. In some embodiments, the current collector can include a metal-coated deformable mesh material such that the current collector is self-fusing. In some embodiments, the fuse can be configured to deform, break, melt, or otherwise discontinue electrical communication between the electrode and other components of the electrochemical cell in response to a high current condition, a high voltage condition, or a high temperature condition.

At one edge of a positive electrode plate in a winding axis direction of an electrode body, two positive electrode tabs per turn are provided to protrude from the edge. At the other edge of a negative electrode plate in the winding axis direction of the electrode body, two negative electrode tabs per turn are provided to protrude from the edge. The multiple positive electrode tabs provided to protrude from the positive electrode plate include multiple types of positive electrode tabs having different protrusion lengths and proximal end widths, and the multiple negative electrode tabs provided to protrude from the negative electrode plate include multiple types of negative electrode tabs having different protrusion lengths and base end widths.

A secondary battery includes an electrode assembly and an electrolyte that are inserted and injected into a pouch. An edge of the pouch is sealed to form a sealing portion. The secondary battery also includes a valve fixed to the sealing portion. The valve includes a body forming a passage having opened one end facing the inside of the pouch and provided with a chamber connected to the passage, wherein a discharge hole communicating with the outside is formed in the chamber. The valve also includes a gate seated on a hook protrusion forming a boundary between the passage and the chamber to open or close the passage. The valve also includes a spring mounted to apply elastic force in a direction in which the gate is closed.

A secondary battery includes an electrode assembly and an electrolyte that are inserted and injected into a pouch. An edge of the pouch is sealed to form a sealing portion. The secondary battery also includes a valve fixed to the sealing portion. The valve includes a body forming a passage having opened one end facing the inside of the pouch and provided with a chamber connected to the passage, wherein a discharge hole communicating with the outside is formed in the chamber. The valve also includes a gate seated on a hook protrusion forming a boundary between the passage and the chamber to open or close the passage. The valve also includes a spring mounted to apply elastic force in a direction in which the gate is closed.