The present invention relates to a secondary battery. The secondary battery according to the present invention may include an electrode assembly, an electrolyte, and a battery case configured to accommodate the electrode assembly and the electrolyte. The battery case may include a main body having accommodation space in which the electrode assembly and the electrolyte are accommodated, an additional electrolyte accommodation part having a storage space in which an additional electrolyte is accommodated, a connection part configured to form a moving passage through which the additional electrolyte is supplied from the addition electrolyte accommodation part to the main body, and an electrolyte impregnation member provided on the connection part and impregnated with the additional electrolyte.

A solid state battery is described, which has a negative electrode having a negative electrode active material layer including silicon (Si) as a negative electrode active material. The Si may be present as particles, e.g., microparticles, having an average particle size (D50) of 0.1 μm to 10 μm. The negative electrode active material layer may include the silicon (Si) in an amount of 75 wt % or more, 95 wt % or more, 99 wt % or more, or 99.9 wt % or more, based on 100 wt % of the negative electrode active material layer. The negative electrode active material layer can be free or substantially free of conductive material, carbon, solid state electrolyte, and/or binder. Preferably, after charge/discharge cycles, the negative electrode active material layer forms densified and interconnected large particles of Li—Si alloy, e.g., the Li—Si alloy may have at least one columnar structure and at least one void.

A solid state battery is described, which has a negative electrode having a negative electrode active material layer including silicon (Si) as a negative electrode active material. The Si may be present as particles, e.g., microparticles, having an average particle size (D50) of 0.1 μm to 10 μm. The negative electrode active material layer may include the silicon (Si) in an amount of 75 wt % or more, 95 wt % or more, 99 wt % or more, or 99.9 wt % or more, based on 100 wt % of the negative electrode active material layer. The negative electrode active material layer can be free or substantially free of conductive material, carbon, solid state electrolyte, and/or binder. Preferably, after charge/discharge cycles, the negative electrode active material layer forms densified and interconnected large particles of Li—Si alloy, e.g., the Li—Si alloy may have at least one columnar structure and at least one void.

A method for charging and discharging a battery, includes, operations of: manufacturing a battery by coupling a battery case and battery electrodes and injecting an electrolyte into the battery case; and activating a battery by inputting a current pulse having a predetermined period to the battery electrodes, wherein the period includes a first time and a second time, equal to or less than the first time, wherein the battery is charged by the current pulse during any one of the first time and the second time, and the battery is discharged by the current pulse during the other one of the first time the second time.

A method for charging and discharging a battery, includes, operations of: manufacturing a battery by coupling a battery case and battery electrodes and injecting an electrolyte into the battery case; and activating a battery by inputting a current pulse having a predetermined period to the battery electrodes, wherein the period includes a first time and a second time, equal to or less than the first time, wherein the battery is charged by the current pulse during any one of the first time and the second time, and the battery is discharged by the current pulse during the other one of the first time the second time.

An all-solid-state cell, having improved short-circuit resistance, comprises a first electrode layer, a first solid electrolyte layer, a second solid electrolyte layer, and a second electrode layer in this order, wherein the first solid electrolyte layer has a first surface, the second solid electrolyte layer has a second surface in contact with the first surface, and a maximum height Rz.sub.1 of the first surface and a maximum height Rz.sub.2 of the second surface satisfy the following relation (1):

0.15≤Rz.sub.1/Rz.sub.2≤0.25  (1)

An all-solid-state cell, having improved short-circuit resistance, comprises a first electrode layer, a first solid electrolyte layer, a second solid electrolyte layer, and a second electrode layer in this order, wherein the first solid electrolyte layer has a first surface, the second solid electrolyte layer has a second surface in contact with the first surface, and a maximum height Rz.sub.1 of the first surface and a maximum height Rz.sub.2 of the second surface satisfy the following relation (1):

0.15≤Rz.sub.1/Rz.sub.2≤0.25  (1)

The present application relates to the technical field of lithium batteries. Disclosed is a lateral-weld soft connector having a pole column. The connector comprises a first connector, which a top end face configured to face upward; a pole column which extends upwards protrudes out of the top end face of the first connector; a second connected extending outwards and connected to a cell is provided at one side of the first connector; the second connector is bent downwards with respect to the first connector and is disposed at a side edge of the cell.

A flexible all-solid-state lithium-ion secondary battery is prepared by placing a positive electrode and a negative electrode or optionally a separator of the lithium-ion secondary battery in a gelable system in which a solid electrolyte has not yet formed by a way of infiltration or coating, so that the surfaces and the interiors of the positive and negative electrodes are infiltrated by the gelable system, which also fills the voids inside the positive and negative electrodes. When the gelable system is solidified to form the solid electrolyte, it can form the solid electrolyte in situ on the surfaces and interiors of the positive and negative electrodes. The lithium-ion secondary battery prepared by the method can form a conductive network inside the entire battery, which can not only extremely reduce the internal resistance of the lithium-ion secondary battery, thereby improving the conductivity and rate capability, but also solve the potential safety hazard problem caused by liquid electrolytes.

A flexible all-solid-state lithium-ion secondary battery is prepared by placing a positive electrode and a negative electrode or optionally a separator of the lithium-ion secondary battery in a gelable system in which a solid electrolyte has not yet formed by a way of infiltration or coating, so that the surfaces and the interiors of the positive and negative electrodes are infiltrated by the gelable system, which also fills the voids inside the positive and negative electrodes. When the gelable system is solidified to form the solid electrolyte, it can form the solid electrolyte in situ on the surfaces and interiors of the positive and negative electrodes. The lithium-ion secondary battery prepared by the method can form a conductive network inside the entire battery, which can not only extremely reduce the internal resistance of the lithium-ion secondary battery, thereby improving the conductivity and rate capability, but also solve the potential safety hazard problem caused by liquid electrolytes.