A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a case accommodating the electrode assembly; and a shock absorbing portion on at least one side of the electrode assembly to absorb shock. According to embodiments of the present disclosure, a bonding force between separators is strengthened by the shock absorbing portion, and, thus, the separators are not separated even by an external shock. In addition, even if the alignment of electrode plates is poor during heat treatment of side surfaces of the electrode assembly, an amount of shrinkage of the separators can be constantly adjusted.

An alkaline storage battery of the present invention includes: an electrode group that includes a positive electrode, a negative electrode, and a separator located between the positive electrode and the negative electrode, which are stacked on top of each other; an outer can that is bottomed cylindrical shape having an opening at the top; a sealing body that seals the outer can; and a positive terminal electrically connected to the sealing body. The positive electrode includes a positive electrode body and a positive electrode protrusion protruding from a portion of the positive electrode body toward the sealing body to connect electrically to the sealing body. The negative electrode includes a negative electrode body and a negative electrode protrusion protruding from a portion of the negative electrode body toward the sealing body and terminating between the sealing body and the negative electrode body. The positive electrode and the negative electrode have a positive electrode active material and a negative electrode active material, respectively, in portions facing each other with the separator therebetween.

An alkaline storage battery of the present invention includes: an electrode group that includes a positive electrode, a negative electrode, and a separator located between the positive electrode and the negative electrode, which are stacked on top of each other; an outer can that is bottomed cylindrical shape having an opening at the top; a sealing body that seals the outer can; and a positive terminal electrically connected to the sealing body. The positive electrode includes a positive electrode body and a positive electrode protrusion protruding from a portion of the positive electrode body toward the sealing body to connect electrically to the sealing body. The negative electrode includes a negative electrode body and a negative electrode protrusion protruding from a portion of the negative electrode body toward the sealing body and terminating between the sealing body and the negative electrode body. The positive electrode and the negative electrode have a positive electrode active material and a negative electrode active material, respectively, in portions facing each other with the separator therebetween.

A solid state battery that includes: a battery element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a composite protective layer covering the battery element, wherein the composite protective layer includes a first protective layer and a second protective layer arranged around the battery element so as to have an overlapping region where the first protective layer and the second protective layer overlap each other; and a conducting part capable of extracting electricity from the battery element to an outside of the solid state battery, the conducting part extending from the overlapping region to the outside of the solid state battery.

A solid state battery that includes: a battery element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a composite protective layer covering the battery element, wherein the composite protective layer includes a first protective layer and a second protective layer arranged around the battery element so as to have an overlapping region where the first protective layer and the second protective layer overlap each other; and a conducting part capable of extracting electricity from the battery element to an outside of the solid state battery, the conducting part extending from the overlapping region to the outside of the solid state battery.

A button-type secondary battery includes an electrode assembly having a first electrode with a first electrode tab and a second electrode with a second electrode tab; a can accommodating the electrode assembly and to which the first electrode tab is connected; a top cap coupled to an opening of the can and to which the second electrode tab is connected; and a first insulation member insulating the first electrode tab. The first electrode tab includes a first coupling surface coupled to the first electrode and a second coupling surface extending from the first coupling surface and coupled to the can. The first insulation member includes a first insulator attached to an outer circumferential surface of the electrode assembly to cover the first coupling surface, and a second insulator horizontally extending from an upper end of the first insulator toward a top surface of the electrode assembly.

A button-type secondary battery includes an electrode assembly having a first electrode with a first electrode tab and a second electrode with a second electrode tab; a can accommodating the electrode assembly and to which the first electrode tab is connected; a top cap coupled to an opening of the can and to which the second electrode tab is connected; and a first insulation member insulating the first electrode tab. The first electrode tab includes a first coupling surface coupled to the first electrode and a second coupling surface extending from the first coupling surface and coupled to the can. The first insulation member includes a first insulator attached to an outer circumferential surface of the electrode assembly to cover the first coupling surface, and a second insulator horizontally extending from an upper end of the first insulator toward a top surface of the electrode assembly.

An electrochemical cell includes a positive electrode including a first current collector, one or more first tabs, and a first active material. A negative electrode includes a second current collector, one or more second tabs, and a second active material. A separator is disposed between the positive electrode and the negative electrode. A resistive coating is configured to at least partially coat one or both of the first current collector, the second current collector, the one or more first tabs, and the one or more second tabs.

A battery and related methods are described. The battery can include a plurality of battery cell segments. Each of the battery cell segments can include an anode segment, a cathode segment, and one or more current limiters. The one or more current limiters are configured to conditionally electrically isolate the battery cell segment based on an occurrence of a short circuit within the battery cell segment. The battery can be used to store electrical power and/or provide electrical power to a load.

An electrode for a secondary battery according to exemplary embodiments includes an electrode current collector; an electrode active material layer formed on the electrode current collector; and a coating layer formed on the electrode active material layer and including rod-shaped inorganic particles and spherical organic particles, wherein a ratio of a length of major axis of the rod-shaped inorganic particle to a length of diameter of the spherical organic particle may be 3 to 5.