A battery cell manufacturing apparatus includes rework automation equipment. The rework automation equipment is configured for measuring the quantity of reworked battery cells while automatically performing rework. The rework automation equipment is configured to automatically rework battery cells determined to be defective. A process for counting a quantity of reworked batteries uses the rework automation equipment.

A battery module includes a cell stack including a plurality of a battery cell, a module case at least partially accommodating the cell stack, and a cooling unit disposed at one side of the cell stack. The battery cell includes a cell case, an electrode assembly and an electrolyte accommodated in the cell case, and an electrolyte storage unit inserted into the cell case to supply a supplementary electrolyte. The electrolyte storage unit is disposed between the electrode assembly and the cooling unit in a cross-sectional view.

A battery module includes a cell stack including a plurality of a battery cell, a module case at least partially accommodating the cell stack, and a cooling unit disposed at one side of the cell stack. The battery cell includes a cell case, an electrode assembly and an electrolyte accommodated in the cell case, and an electrolyte storage unit inserted into the cell case to supply a supplementary electrolyte. The electrolyte storage unit is disposed between the electrode assembly and the cooling unit in a cross-sectional view.

A method of manufacturing a battery proposed herein includes the following steps A to D. Step A is the step of preparing a battery case in which an electrode assembly is enclosed. Step B is the step of depressurizing an interior of the battery case prepared in step A. Step C is the step of filling an electrolyte solution and a leakage testing gas into the battery case depressurized in step B. Step D is the step of sealing the battery case containing the electrolyte solution and the leakage testing gas filled in step C.

There is provided a method for producing a separator for an electricity storage device that includes a step of contacting a porous body formed from a silane-modified polyolefin-containing molded sheet with a base solution or acid solution, and a separator for an electricity storage device comprising a microporous film with a melted film rupture temperature of 180° C. to 220° C. as measured by thermomechanical analysis (TMA).

A lithium-ion battery with high safety is provided. A lithium-ion battery 20 includes an electrode group 6, an electrolyte, and a battery container 5 that contains the electrode group 6 and the electrolyte. The electrode group 6 is formed by stacking a positive electrode and a negative electrode via a separator. The positive electrode contains a composite oxide of lithium, nickel, manganese, and cobalt as a main positive active material. The negative electrode contains amorphous carbon as a main negative active material. The lithium-ion battery 20 has a discharge capacity of 20 Ah or more. The ratio (the value of Y/X) of a volume Y occupied by the electrolyte to a volume X of a void space in the battery container 5 is 0.65 or more.

A method of manufacturing battery including an electrode assembly having a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode, and a battery case configured to accommodate the electrode assembly. The separator is provided with adhesion layers formed on both surfaces of the separator. The method comprising: an arranging step for arranging the electrode assembly, in which the positive electrode and the separator are adhered by the adhesion layer and the negative electrode and the separator are adhered by the adhesion layer, inside the battery case; a peeling step for peeling off at least one, among the positive electrode and the negative electrode, and the separator on the electrode assembly; and a liquid injection step for performing a liquid injection of an electrolyte solution into the battery case after the peeling step.

A method of manufacturing battery including an electrode assembly having a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode, and a battery case configured to accommodate the electrode assembly. The separator is provided with adhesion layers formed on both surfaces of the separator. The method comprising: an arranging step for arranging the electrode assembly, in which the positive electrode and the separator are adhered by the adhesion layer and the negative electrode and the separator are adhered by the adhesion layer, inside the battery case; a peeling step for peeling off at least one, among the positive electrode and the negative electrode, and the separator on the electrode assembly; and a liquid injection step for performing a liquid injection of an electrolyte solution into the battery case after the peeling step.

A herein disclosed manufacturing method of a secondary battery is a manufacturing method of a secondary battery that includes a wound electrode assembly and a battery case. The herein disclosed manufacturing method of the secondary battery comprising: an arranging step for arranging the plural wound electrode assemblies inside the battery case; a peeling step for peeling off at least one, among the positive electrode and the negative electrode, and the separator; and a liquid injection step for performing a liquid injection of the electrolyte solution into the battery case. At the peeling step, at least one, among the positive electrode and the negative electrode of each wound electrode assembly, and the separator are peeled off to make a state where a peeled area is formed on each of the plural wound electrode assemblies.

A herein disclosed manufacturing method of a secondary battery is a manufacturing method of a secondary battery that includes a wound electrode assembly and a battery case. The herein disclosed manufacturing method of the secondary battery comprising: an arranging step for arranging the plural wound electrode assemblies inside the battery case; a peeling step for peeling off at least one, among the positive electrode and the negative electrode, and the separator; and a liquid injection step for performing a liquid injection of the electrolyte solution into the battery case. At the peeling step, at least one, among the positive electrode and the negative electrode of each wound electrode assembly, and the separator are peeled off to make a state where a peeled area is formed on each of the plural wound electrode assemblies.