KR-20260063724-A - METHOD AND SYSTEM FOR DETECTING DEFECT OF BATTERY IN FORMATION PROCESS

KR20260063724AKR 20260063724 AKR20260063724 AKR 20260063724AKR-20260063724-A

Abstract

A method for detecting defects in a battery during a formation process according to one embodiment of the present invention may include: a step of pressurizing or charging at least one battery cell during a formation process; a step of measuring the pressure of a plurality of regions of the at least one battery cell when the at least one battery cell is pressurized or charged; and a step of generating data on whether the at least one battery cell is defective based on the pressure difference between the plurality of regions.

Inventors

이종혁
길나은
박현섭
신슬기

Assignees

에스케이온 주식회사

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (18)

A step of pressurizing or charging at least one battery cell in a formation process; When the at least one battery cell is pressurized or charged, the step of measuring the pressure of a plurality of regions of the at least one battery cell; and A method for detecting defects in a battery during a formation process, comprising the step of generating defect status data of at least one battery cell based on the pressure difference between the plurality of regions.
In paragraph 1, The above defect data includes data on the presence of foreign matter within the at least one battery cell, and A method for detecting defects in a battery during a formation process, comprising the step of generating the above data, which includes generating data indicating that a foreign substance exists in at least one battery cell when the pressure difference between the plurality of regions is greater than the reference pressure difference.
In paragraph 2, A method for detecting defects in a battery during a formation process, wherein the plurality of regions above include a plurality of regions of one of the at least one battery cells.
In paragraph 3, The above defect data further includes foreign matter location data within one of the at least one battery cell, and A method for detecting defects in a battery during a manufacturing process, comprising the step of generating the above data, which includes generating data indicating that a foreign substance exists at a location corresponding to the region with higher pressure among the plurality of regions.
In paragraph 2, The above at least one battery cell includes a plurality of battery cells, and A method for detecting defects in a battery during a manufacturing process, wherein the plurality of regions include at least one region of each of the plurality of battery cells.
In paragraph 1, The above-mentioned step of pressurizing or charging includes applying more intensive pressure to a specific area of one of the at least one battery cell, and The above specific region is a method for detecting defects in a battery during a manufacturing process, comprising the above plurality of regions.
In paragraph 1, The above-mentioned step of pressurizing or charging includes Press Pre-Charging (PPC) for simultaneously pressurizing and charging the at least one battery cell, and charging or discharging the at least one battery cell after the PPC. A method for detecting defects in a chemistry process battery, comprising the step of measuring the pressure, which includes measuring the pressure of the plurality of regions when the PPC is performed.
In paragraph 1, The above-mentioned step of pressurizing or charging includes pre-charging the at least one battery cell and charging or discharging the at least one battery cell after the pre-charging. A method for detecting defects in a battery during a formation process, comprising the step of measuring the pressure, measuring the pressure of the plurality of regions when at least one of the initial charge, the charge, and the discharge is performed.
In paragraph 1, A method for detecting defects in a battery during a formation process, further comprising a formation finishing step after the step of measuring the pressure, wherein at least one of aging to stabilize the at least one battery cell and degassing to remove gas within the at least one battery cell is performed.
In Paragraph 9, A method for detecting defects in a battery during a formation process, further comprising a step of controlling to stop the progress of the formation finishing step for a defective battery cell when data is generated that at least one battery cell is defective by the step of generating the data above.
In paragraph 1, A method for detecting defects in a battery during a formation process, further comprising the step of manufacturing at least one battery cell by combining a battery case and battery electrodes and injecting an electrolyte into the battery case prior to the step of pressurizing or charging.
A plurality of support plates with at least one battery cell disposed between them to perform a formation process; A charger/discharger configured to charge or discharge at least one battery cell; A plurality of pressure sensors disposed on the plurality of support plates to measure the pressure of a plurality of regions of the at least one battery cell; and A battery defect detection system for a manufacturing process, comprising: a controller configured to generate defect status data of at least one battery cell based on the pressure difference between the plurality of regions.
In Paragraph 12, The above defect data includes data on the presence of foreign matter within the at least one battery cell, and The above controller is a battery defect detection system for a chemical process that generates data indicating the presence of foreign matter in at least one battery cell when the pressure difference between the plurality of regions is greater than the reference pressure difference.
In Paragraph 13, A battery defect detection system in which the plurality of pressure sensors are arranged on the plurality of support plates to measure the pressure of a plurality of regions of one of the at least one battery cells.
In Paragraph 14, The above defect data further includes foreign matter location data within one of the at least one battery cell, and A battery defect detection system for a chemical process, comprising the above controller generating data that a foreign substance is present at a location corresponding to the region with higher pressure among the plurality of regions.
In Paragraph 13, The above at least one battery cell includes a plurality of battery cells, and A battery defect detection system in which the plurality of pressure sensors are arranged on the plurality of support plates to measure the pressure of at least one region of each of the plurality of battery cells.
In Paragraph 12, A battery defect detection system for a chemical process, further comprising a pressurizer that presses the plurality of support plates.
In Paragraph 17, The above pressurizer presses the plurality of support plates so that a specific area of one of the at least one battery cell is more intensively pressurized, and The above specific region is a battery defect detection system for a chemical process that includes the above plurality of regions.

Description

Method and System for Detecting Defects in Battery in Formation Process The present invention relates to a method and system for detecting defects in a battery during the manufacturing process. In the context of batteries, secondary batteries are receiving significant attention as power sources for various mobile devices and electric vehicles due to the convenience of being rechargeable, unlike primary batteries. Such secondary batteries may include battery cells in which an electrode assembly, formed by stacking a positive electrode plate, a negative electrode plate, and a separator or winding them into a roll, is housed inside a case. Multiple battery cells may be stacked in a predetermined direction and housed in a battery module or battery pack. A battery pack may include multiple battery modules. Detecting battery defects during the manufacturing process is crucial for ensuring battery safety. The productivity of the battery manufacturing process can be improved as the efficiency of battery defect detection increases. FIG. 1 is a flowchart illustrating battery processes to which the formation process of the formation process of the formation process battery defect detection method and system according to one embodiment of the present invention belongs. FIGS. 2A and 2B are flowcharts illustrating the timing of detecting defects (e.g., foreign matter) within the formation process of a formation process battery defect detection method and system according to one embodiment of the present invention. FIG. 2c is a flowchart illustrating a method for detecting defects in a battery during a formation process according to one embodiment of the present invention. FIGS. 3a and 3b are a side view and a plan view illustrating a structure for measuring pressure in a plurality of regions of at least one battery cell, according to one embodiment of the present invention, for a method and system for detecting defects in a battery during a formation process. FIG. 4a is a plan view illustrating a method and system for detecting defects in a battery during a formation process according to an embodiment of the present invention, which generates data indicating that foreign matter exists in at least one battery cell based on the pressure difference between a high-pressure region and a low-pressure region when foreign matter exists in at least one battery cell. FIG. 4b is a plan view illustrating a method and system for detecting defects in a battery during a formation process according to an embodiment of the present invention, which generates data indicating that there is no foreign matter in at least one battery cell based on pressure similarity between low-pressure regions when there is no foreign matter in at least one battery cell. FIGS. 5A and 5B are a side view and a plan view illustrating a structure for measuring pressure in a plurality of regions of a plurality of battery cells, according to one embodiment of the present invention, for a method and system for detecting defects in a battery during a formation process. FIG. 6 is a plan view illustrating a method and system for detecting defects in a battery during a formation process according to an embodiment of the present invention, which selects a battery cell containing foreign matter among a plurality of battery cells and generates foreign matter distribution data (information) of the selected battery cell. FIG. 7 is a side view illustrating a method and system for detecting defects in a battery during a formation process according to an embodiment of the present invention, wherein the pressure of a plurality of regions of at least one battery cell is measured based on expansion due to charging of at least one battery cell. FIGS. 8A and 8B are plan views illustrating a structure in which a method and system for detecting defects in a battery during a formation process according to an embodiment of the present invention concentrates pressure on a part of a battery cell and measures. Prior to the detailed description of the embodiments, terms and words used in the following description and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor may appropriately define the concept of the terms to best describe his invention. Identical reference numbers or symbols in each drawing represent parts or components that perform substantially the same function. For convenience of explanation and understanding, the same reference numbers or symbols may be used in different embodiments. In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprising" or "constituting" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the