Method for locating laminate type battery pole piece

Abstract

The invention provides a polar piece positioning method of a stack-up type battery; wherein, the method comprises the steps that the pressure vertical to the plane is uniformly applied to one plane or two planes of the electric core parallel to the polar piece. When the polar piece positioning method provided by the invention is adopted to position the polar piece, the good positioning of the polar piece can be realized, and the positioned electronic core occupies the less space of the battery, and the energy density of the battery is enhanced. In addition, the operation of the polar piece positioning method provided by the invention has the advantages is simple, and the invention is easy to be implemented.

Description

technical field

[0001] The invention relates to a stacked battery, in particular to a method for positioning the pole pieces of the stacked battery. Background technique

[0002] The preparation method of the laminated battery is as follows: the positive electrode sheet, the separator and the negative electrode sheet are stacked together alternately or the negative electrode sheet, the separator and the positive electrode sheet are stacked together to form a cell, and then the cell is put into the battery case to make a cell. into a battery. Since batteries with a stacked structure are suitable for the production of batteries of various types and capacities, batteries with this structure have been widely used, such as in the field of lithium-ion secondary batteries. Since the laminated battery is formed by interlacing the positive electrode, the separator and the negative electrode, the battery of this structure involves the positioning of the electrode in the battery. If t...

Examples

Embodiment 1

[0018] This embodiment takes pole piece positioning of a laminated lithium-ion battery as an example to illustrate the pole piece positioning method provided by the present invention.

[0019] 1. First, prepare the positive electrode sheet and the negative electrode sheet according to the following method.

[0020] (1) Preparation of positive electrode sheet

[0021] 1000 g of positive electrode active material LiCoO 2 , 30 grams of binder PVDF, 50 grams of conductive agent acetylene black were added to 600 grams of solvent NMP, and then stirred in a vacuum mixer to form a stable and uniform dispersed positive electrode slurry. The slurry is evenly and intermittently coated on both sides of a wide aluminum foil (500 mm in width and 20 microns in thickness), then dried at 120° C., and rolled into a pole with a thickness of 120 microns on a rolling mill. Use a punching machine to punch out a positive electrode sheet with a length of 200 mm, a width of 150 mm, and a thickness o...

Embodiment 2

[0032] This embodiment takes pole piece positioning of a laminated lithium-ion battery as an example to illustrate the pole piece positioning method provided by the present invention.

[0033] 1. According to the method described in Example 1, 1000 battery cells were prepared, and the thicknesses of the prepared battery cells were measured with a vernier caliper, and the average thickness of the battery cells was obtained to be 43 mm.

[0034] 2. Position the pole pieces in 1000 batteries respectively, the positioning method is as follows:

[0035]Select two smooth steel plates with a length of 250 mm, a width of 200 mm, and a thickness of 30 mm as the pressure plate, place one of the pressure plates on a flat workbench, place the battery on the pressure plate, and make the long side of the battery and the pressure plate The long side of the battery cell is parallel to the short side of the pressure plate, so that the battery cell is in full contact with the pressure plate, an...

Embodiment 3

[0038] This embodiment takes pole piece positioning of a laminated lithium-ion battery as an example to illustrate the pole piece positioning method provided by the present invention.

[0039] 1. According to the method described in Example 1, 1000 battery cells were prepared, and the thicknesses of the prepared battery cells were measured with a vernier caliper, and the average thickness of the battery cells was obtained to be 43 mm.

[0040] 2. Position the pole pieces in 1000 batteries respectively, the positioning method is as follows:

[0041] Select two smooth steel plates with a length of 250 mm, a width of 200 mm, and a thickness of 30 mm as the pressure plate, place one of the pressure plates on a flat workbench, place the battery on the pressure plate, and make the long side of the battery and the pressure plate The long side of the battery cell is parallel to the short side of the pressure plate, so that the battery cell is in full contact with the pressure plate, a...

technical field

[0001] The invention relates to a stacked battery, in particular to a method for positioning the pole pieces of the stacked battery. Background technique

[0002] The preparation method of the laminated battery is as follows: the positive electrode sheet, the separator and the negative electrode sheet are stacked together alternately or the negative electrode sheet, the separator and the positive electrode sheet are stacked together to form a cell, and then the cell is put into the battery case to make a cell. into a battery. Since batteries with a stacked structure are suitable for the production of batteries of various types and capacities, batteries with this structure have been widely used, such as in the field of lithium-ion secondary batteries. Since the laminated battery is formed by interlacing the positive electrode, the separator and the negative electrode, the battery of this structure involves the positioning of the electrode in the battery. If t...

Examples

Embodiment 1

[0018] This embodiment takes pole piece positioning of a laminated lithium-ion battery as an example to illustrate the pole piece positioning method provided by the present invention.

[0019] 1. First, prepare the positive electrode sheet and the negative electrode sheet according to the following method.

[0020] (1) Preparation of positive electrode sheet

[0021] 1000 g of positive electrode active material LiCoO 2 , 30 grams of binder PVDF, 50 grams of conductive agent acetylene black were added to 600 grams of solvent NMP, and then stirred in a vacuum mixer to form a stable and uniform dispersed positive electrode slurry. The slurry is evenly and intermittently coated on both sides of a wide aluminum foil (500 mm in width and 20 microns in thickness), then dried at 120° C., and rolled into a pole with a thickness of 120 microns on a rolling mill. Use a punching machine to punch out a positive electrode sheet with a length of 200 mm, a width of 150 mm, and a thickness o...

Embodiment 2

[0032] This embodiment takes pole piece positioning of a laminated lithium-ion battery as an example to illustrate the pole piece positioning method provided by the present invention.

[0033] 1. According to the method described in Example 1, 1000 battery cells were prepared, and the thicknesses of the prepared battery cells were measured with a vernier caliper, and the average thickness of the battery cells was obtained to be 43 mm.

[0034] 2. Position the pole pieces in 1000 batteries respectively, the positioning method is as follows:

[0035]Select two smooth steel plates with a length of 250 mm, a width of 200 mm, and a thickness of 30 mm as the pressure plate, place one of the pressure plates on a flat workbench, place the battery on the pressure plate, and make the long side of the battery and the pressure plate The long side of the battery cell is parallel to the short side of the pressure plate, so that the battery cell is in full contact with the pressure plate, an...

Embodiment 3

[0038] This embodiment takes pole piece positioning of a laminated lithium-ion battery as an example to illustrate the pole piece positioning method provided by the present invention.

[0039] 1. According to the method described in Example 1, 1000 battery cells were prepared, and the thicknesses of the prepared battery cells were measured with a vernier caliper, and the average thickness of the battery cells was obtained to be 43 mm.

[0040] 2. Position the pole pieces in 1000 batteries respectively, the positioning method is as follows:

[0041] Select two smooth steel plates with a length of 250 mm, a width of 200 mm, and a thickness of 30 mm as the pressure plate, place one of the pressure plates on a flat workbench, place the battery on the pressure plate, and make the long side of the battery and the pressure plate The long side of the battery cell is parallel to the short side of the pressure plate, so that the battery cell is in full contact with the pressure plate, a...

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