KR20240174957A - System for manufacturing secondary battery and method for manufacturing secondary battery - Google Patents

Abstract

The present invention relates to a secondary battery manufacturing system, and more specifically, to a secondary battery manufacturing system for injecting an electrolyte into a secondary battery cell.
The present invention comprises: a loading area (LA) for loading a plurality of secondary battery cells (1) from a loading tray (10) onto a lower pallet (1100); an unloading area (ULA) for discharging the secondary battery cells (1) from the lower pallet (1100) to the outside; a lower pallet moving line (200) for moving the lower pallet (1100) between the loading area (LA) and the unloading area (ULA); a pallet joining area (300) for receiving a lower pallet (1100) on which a plurality of secondary battery cells (1) are loaded, and then joining an upper pallet (1200) to the lower pallet (1100) to form a pallet assembly (1000); Disclosed is a secondary battery manufacturing system characterized by including: an electrolyte injection unit (400) which receives a pallet assembly (1000) from a pallet combining area (300) and injects an electrolyte into each secondary cell (1) through an upper pallet (1200); one or more electrolyte impregnation units (500) which receive a pallet assembly (1000) from the electrolyte injection unit (400) and form a preset pressure condition so that the electrolyte is impregnated; and a pallet separation unit (600) in which, after the electrolyte is impregnated, the upper pallet (1200) is separated from the pallet assembly (1000) and transferred to the pallet combining area (300) through an upper pallet movement line (700) and the remaining lower pallets (1100) are transferred to the lower pallet movement line (200).

Description

Secondary battery manufacturing system and secondary battery manufacturing method {System for manufacturing secondary battery and method for manufacturing secondary battery}

The present invention relates to a secondary battery manufacturing system, and more specifically, to a secondary battery manufacturing system for injecting an electrolyte into a secondary battery cell.

In general, a chemical battery is a battery composed of a pair of electrodes, a positive electrode and a negative electrode, and an electrolyte. The amount of energy that can be stored varies depending on the materials that make up the electrodes and the electrolyte.

These chemical batteries are divided into primary batteries, which have a very slow charging reaction and are only used for single-discharge purposes, and secondary batteries, which can be reused through repeated charging and discharging.

Secondary batteries are being applied to various technological fields across industries, and are being used as an energy source for cutting-edge electronic devices such as wireless mobile devices. They are also attracting attention as an energy source for hybrid electric vehicles, which are being proposed as a solution to solve air pollution caused by existing gasoline and diesel internal combustion engines that use fossil fuels.

Secondary batteries are manufactured in various shapes depending on the shape of the case that houses the electrode assembly. Representative shapes include cylindrical, square, and pouch shapes.

Figure 1 is a perspective view showing an example of a square secondary battery.

A square secondary battery is configured to include a rectangular case (10) in which a battery assembly in which a positive electrode sheet, a separator, and a negative electrode sheet are sequentially laminated is built in, as in Patent Document 1, and a cap (20) that covers an upper opening of the case (10).

The above cap (20) covers the upper opening of the case (10) and has a first electrode (23) and a second electrode (24) forming an anode and a cathode.

Meanwhile, a square secondary battery having the above configuration forms an electrolyte injection port (21) in a cap (20), and the electrolyte injection port (21) is sealed by a nail (22) before and after electrolyte injection.

Accordingly, in order to increase productivity, the electrolyte injection process for square secondary batteries needs to be performed more efficiently.

(Patent Document 1) KR 10-2023-0048765 A

The purpose of the present invention is to recognize the above-mentioned necessity and to provide a secondary battery manufacturing system capable of quickly performing an electrolyte injection process for a square secondary battery.

The present invention has been created to achieve the above-described purpose of the present invention, and the present invention comprises a loading area (LA) in which a plurality of secondary battery cells (1) are loaded onto a lower pallet (1100) from a loading tray (10) on which a plurality of secondary battery cells (1) are loaded, and an unloading area (ULA) in which a plurality of secondary battery cells (1) are discharged to the outside from the lower pallet (1100), and a lower pallet moving line (200) in which the lower pallet (1100) is moved between the loading area (LA) and the unloading area (ULA); A pallet joining area (300) installed on one side of the lower pallet moving line (200) to receive the lower pallet (1100) on which the plurality of secondary battery cells (1) are loaded, and then joins the upper pallet (1200) to the lower pallet (1100) to cover the upper portions of the plurality of secondary battery cells (1) loaded on the lower pallet (1100) to form a pallet assembly (1000); one or more electrolyte injection units (400) that receive the pallet assembly (1000) from the pallet joining area (300) and inject electrolyte into each of the secondary battery cells (1) through the upper pallet (1200); Disclosed is a secondary battery manufacturing system characterized by including at least one electrolyte impregnation unit (500) which receives the pallet assembly (1000) from the electrolyte injection unit (400) after electrolyte injection and forms preset pressure conditions so that the separator of the secondary battery cell (1) is impregnated with the electrolyte; and a pallet separation unit (600) in which, after the electrolyte is impregnated, the upper pallet (1200) is separated from the pallet assembly (1000) and transferred to the pallet joining area (300) through the upper pallet moving line (700) and the remaining lower pallets (1100) are transferred to the lower pallet moving line (200).

The above-described plurality of secondary battery cells (1) are square secondary batteries having a rectangular shape in plan view, in which the electrolyte injection port (21) is formed offset from the center of the upper surface to one side, and are arranged in one or more rows so that the long sides are parallel, and may include a first cell rotation unit (2100) that rotates odd-numbered or even-numbered secondary battery cells (1) among the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200) so that the electrolyte injection port (21) is positioned on the opposite side.

It may include a second cell rotation unit (2200) that rotates odd-numbered or even-numbered secondary battery cells (1) among the plurality of secondary battery cells (1) so that the electrolyte injection ports (21) of the plurality of secondary battery cells (1) are positioned on the same side after being delivered from the unloading area (ULA) of the lower pallet moving line (200).

It may include a first cell weight measuring unit (2300) that measures the weight of each of the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200).

It may include a second cell weight measuring unit (2400) that measures the weight of each of the plurality of secondary battery cells (1) after receiving them from the unloading area (ULA) of the lower pallet moving line (200).

The above electrolyte impregnation unit (500) may include an impregnation chamber (510) that forms preset pressure conditions.

The above impregnation chamber (510) may include a pallet support member (511) that supports the pallet assembly (1000); and a chamber body (512) that rises from the pallet support member (511) when the pallet assembly (1000) is introduced and descends when the impregnation process is performed to form a sealed impregnation space (S) together with the pallet support member (511).

A plurality of pallet assemblies (1000) are introduced in a state of being stacked vertically in the above impregnation chamber (510), and may include a pallet assembly stacking section (520) adjacent to the impregnation section (500) in which a plurality of pallet assemblies (1000) are stacked vertically.

The lower pallet moving line (200) and the upper pallet moving line (700) are arranged parallel to each other, and the upper pallet moving line (700) is arranged parallel to the upper pallet moving line (700) and adjacent to the upper pallet moving line (700), and includes a pallet assembly moving line (800) on which the pallet assembly (1000) is moved, and the electrolyte impregnation unit (500) can be installed in multiple numbers facing the upper pallet moving line (700) with respect to the pallet assembly moving line (800).

The secondary battery manufacturing system according to the present invention comprises: a first transfer area (TA) installed adjacent to the lower pallet moving line (200) for transferring a plurality of secondary battery cells (1) to the loading area (LA) of the lower pallet moving line (200); a tray loading area (TL) in which a loading tray (10) loaded with a plurality of secondary battery cells (1) is loaded from the outside; and at least one loading line (100) in which the loading tray (10) is moved between the first transfer area (TA) and the tray loading area (TL); A second transfer area (UTA) is installed adjacent to the lower pallet moving line (200) and receives a plurality of secondary battery cells (1) from the unloading area (ULA) of the lower pallet moving line (200), and a tray unloading area (TU) in which an unloading tray (10) loaded with a plurality of secondary battery cells (1) is discharged to the outside is set, and one or more unloading lines (900) in which the unloading tray (10) is moved between the second transfer area (UTA) and the tray unloading area (TU) are set.

The above loading line (100) may include a first loading line (110) along which a loading tray (10) loaded with a plurality of secondary battery cells (1) into which the electrolyte is first injected is moved; and a second loading line (120) along which a loading tray (10) loaded with a plurality of secondary battery cells (1) into which the electrolyte is secondarily injected is moved after the electrolyte is first injected.

The second loading line (120) may be equipped with a nail removal unit (3100) that removes nails (22) inserted into the electrolyte injection ports (21) of the secondary battery cells (1).

The above unloading line (900) may be equipped with a nail insertion unit (3200) for inserting nails (22) into the electrolyte injection ports (21) of a plurality of secondary battery cells (1) that have completed electrolyte injection.

A cleaning unit (3900) for cleaning the electrolyte injection port (21) before the nail (22) is inserted by the nail insertion unit (3200) may be installed.

The secondary battery manufacturing system according to the present invention has the advantage of being able to stably and quickly perform the electrolyte injection and impregnation process by forming a single pallet assembly by mounting a plurality of secondary battery cells on a lower pallet, then combining an upper pallet equipped with an electrolyte injection assistance module, and then performing electrolyte injection and impregnation.

In addition, by positioning the electrolyte injection ports of adjacent secondary battery cells on opposite sides before the electrolyte injection process of a square secondary battery in which the electrolyte injection ports are biased to one side, the size of the chambers and parts for electrolyte injection can be reduced, thereby reducing the overall footprint.

Specifically, when the electrolyte injection ports of adjacent secondary battery cells are positioned on opposite sides, the injection modules for electrolyte injection can be configured relatively close together, thereby reducing the size of the injection modules for electrolyte injection.

Furthermore, since the impregnation process is performed inside the vacuum chamber after the electrolyte is injected, there is an advantage in that the footprint can be reduced by reducing the size of the vacuum chamber by reducing the planar size of the member in which the secondary battery cells injected with the electrolyte are loaded, for example, the pallet assembly described above, while significantly reducing the size of the internal space for forming vacuum pressure, thereby greatly improving the impregnation efficiency.

Figure 1 is a perspective view showing an example of a conventional square secondary battery.
Figure 2 is a conceptual diagram showing the layout of a secondary battery manufacturing system according to the present invention.
FIGS. 3A and 3B are plan views showing a state in which some cells are rotated by the cell rotation unit in the secondary battery manufacturing system of FIG. 2.
FIG. 4a is a perspective view showing a state in which a lower pallet, cell, and upper pallet used in the secondary battery manufacturing system of FIG. 2 are combined.
Figure 4b is a perspective view showing the pallet assembly of Figure 4a in a separated state.
Figure 4c is a side view of the pallet assembly of Figure 4a.
Figure 4d is a cross-sectional view taken along the AA direction in Figure 4a.
Figure 5 is a side view showing the pallet assembly of Figure 4a stacked in three stages.
Figure 6 is a front view showing an example of a cleaning section of the secondary battery manufacturing system of Figure 2.
Figure 7 is an enlarged view of portion C in Figure 6.
Fig. 8 is a conceptual diagram showing the movement of the cleaning sheet of the cleaning section of Fig. 2.
Figures 9a and 9b are drawings showing modified examples of the cleaning section of Figure 6, respectively.

Hereinafter, a secondary battery manufacturing system according to the present invention will be described with reference to the attached drawings.

The secondary battery manufacturing system according to the present invention is a system for injecting and impregnating an electrolyte into a secondary battery cell (1), particularly a square secondary battery cell as shown in FIG. 1.

To this end, the secondary battery manufacturing system according to the present invention, as illustrated in FIG. 2, comprises: a lower pallet moving line (200) in which a lower pallet (1100) is moved between a loading area (LA) and an unloading area (ULA); a pallet joining area (300) installed on one side of the lower pallet moving line (200) to receive the lower pallet (1100) and then join the upper pallet (1200) to the lower pallet (1100) to cover the upper portions of the secondary battery cells (1) to form a pallet assembly (1000); and one or more electrolyte injection units (400) that receive the pallet assembly (1000) from the pallet joining area (300) and inject electrolyte into each of the secondary battery cells (1) through the upper pallet (1200). It includes one or more electrolyte impregnation units (500) that form preset pressure conditions so that the electrolyte is impregnated into the separator of the secondary battery cell (1) after the electrolyte is injected; and a pallet separation unit (600) in which, after the electrolyte is impregnated, the upper pallet (1200) is separated from the pallet assembly (1000) and transferred to the pallet joining area (300) through the upper pallet moving line (700) and the remaining lower pallets (1100) are transferred to the lower pallet moving line (200).

The above lower pallet moving line (200) is configured to have a loading area (LA) where a plurality of secondary battery cells (1) are loaded onto a lower pallet (1100) from a loading tray (10) on which a plurality of secondary battery cells (1) are loaded, and an unloading area (ULA) where a plurality of secondary battery cells (1) are discharged to the outside from the lower pallet (1100), and the lower pallet (1100) is moved between the loading area (LA) and the unloading area (ULA). Various configurations are possible depending on the transport structure of the lower pallet (1100).

The above lower pallet (1100) is configured to form a pallet assembly (1000) by loading a plurality of secondary battery cells (1) and combining with an upper pallet (1200) described below. Various configurations are possible depending on the loading structure of the plurality of secondary battery cells (1) and the combining structure with the upper pallet (1200).

For example, the lower pallet (1100) may include a lower plate (1110) having mounting portions (1111) formed thereon, on which a plurality of secondary battery cells (1) are mounted, as shown in FIGS. 4a to 4d.

The above lower plate (1110) is configured to form the main body of the lower pallet (1100) by forming mounting portions (1111) on which a plurality of secondary battery cells (1) are mounted, and various configurations are possible.

The above-mentioned fixing portion (1111) is formed on the lower plate (1110) so that a plurality of secondary battery cells (1) can be fixed, and various configurations are possible depending on the arrangement of the plurality of secondary battery cells (1).

Meanwhile, the above-mentioned fixing portion (1111) may be formed as a concave groove into which a part of the lower part of the secondary battery cell (1) is inserted, taking into consideration the stability of the fixing state of the secondary battery cell (1).

And, as shown in FIG. 4d, the fixing portion (1111) may be provided with one or more elastic members (1119) that apply elastic force to the lower surface of the secondary battery cell (1), particularly the lower surface of the base member (1118) that supports the lower surface of the cell (1), for cushioning when the secondary battery cell (1) is pressed downward while the upper pallet (1200) is coupled.

The above elastic member (1119) is configured to apply elastic force to the bottom surface of the secondary battery cell (1), particularly the bottom surface of the base member (1118) that supports the bottom surface of the cell (1), for cushioning when the secondary battery cell (1) is pressed downward while the upper pallet (1200) is combined, and may be configured as a coil spring, etc.

Meanwhile, the lower pallet (1100) may be installed with a plurality of guide pin parts (1120) for coupling with and positioning guides to the upper pallets (1200) described below.

The above guide pin portion (1120) is configured to be installed in multiples for the purpose of coupling with and positioning guide for the upper pallet (1200) described later, and considering that the plane shape of the lower pallet (1100) is substantially rectangular, it can be positioned at a position corresponding to the corner of a rectangular shape.

For example, the guide pin portion (1120) may include a head portion (1122) that is inserted into an insertion hole (1230) formed in the upper pallet (1200).

The above head part (1122) is configured to be inserted into an insertion hole (1230) formed in the upper pallet (1200), and various configurations are possible.

The above head portion (1122) may have a cylindrical structure with a portion cut off or may have various shapes such as a polygonal cross-sectional shape to prevent rotation when inserted into the insertion hole (1230).

In addition, the head portion (1122) may be formed so that the cross-sectional size decreases as the upper portion goes upward so that it can be inserted into an insertion groove formed on the bottom surface of the guide pin portion (1120) of the lower pallet (1100) of the pallet assembly (1000) located at the upper side when the pallet assemblies (1000) described below are stacked in multiple positions vertically.

Meanwhile, the guide pin portion (1120) may have a coil spring (1123) installed to cushion the upper pallet (1200) when the upper pallet (1200) is combined.

The above coil spring (1123) is configured to be inserted into the outer periphery of the guide pin portion (1120) to provide elasticity for cushioning the upper pallet (1200) when the upper pallet (1200) is coupled, and may have an appropriate length and elasticity.

Meanwhile, the guide pin portion (1120) may be equipped with an external cylinder (1124) to protect the coil spring (1123) and support the bottom surface of the upper pallet (1200) to prevent excessive lowering of the upper pallet (1200).

The above outer cylinder (1124) is configured to protect the coil spring (1123) and support the bottom surface of the upper pallet (1200) to prevent excessive lowering of the upper pallet (1200). It has an inner diameter larger than the outer diameter of the coil spring (1123) described above, and can be inserted into the outside of the coil spring (1123) and joined to the lower portion of the guide pin portion (1120).

Meanwhile, at least one of the lower pallet (1100) and the upper pallet (1200) may additionally be provided with one or more locking parts (1130) to maintain the lower pallet (1100) and the upper pallet (1200) in a combined state.

The above locking part (1130) is configured to maintain the lower pallet (1100) and upper pallet (1200) in a combined state, and various configurations are possible depending on the combined structure.

For example, the locking portion (1130) may include a load portion (1131) rotatably connected to a hinge portion (1132) of a lower pallet (1100), for example, a lower plate (1110), and a first catch portion (1133) provided on an upper portion of the load portion (1131) and caught on a second catch portion (1213) provided on an upper plate (1210) of an upper pallet (1200) described later.

The above load member (1131) is configured to be rotatably connected to a hinge member (1132) of a lower pallet (1100), for example, a lower plate (1110), and various configurations such as a plate-shaped load member are possible.

Here, the hinge part (1132) is installed on the lower pallet (1100), for example, the lower plate (1110), and is configured to allow the load part (1131) to be hinge-rotatably connected, and various configurations are possible.

In particular, the hinge part (1132) may be installed on the upper surface of the lower pallet (1100), for example, the lower plate (1110), to prevent the lower pallet (1100) from protruding outward.

The above first catch (1133) is configured to catch on the second catch (1213) provided on the upper plate (1210) of the upper pallet (1200) which is provided on the upper part of the load part (1131) and described later, and various configurations are possible depending on the catch structure with the second catch (1213).

As an example, the first catch (1133) may be composed of a pair of protruding rods protruding from both sides.

At this time, the second catch (1213) may be configured as a groove corresponding to the cross-sectional shape of the load portion (1131) so that it can be inserted inward from the edge of the upper plate (1210) while the load portion (1131) is rotated and rotated vertically.

At this time, the above-mentioned groove can support a pair of protruding rods from the upper surface.

Meanwhile, the locking part (1130) having the above configuration can be rotated upward by a separate hooking member (not shown) that moves laterally to connect the lower pallet (1100) and the upper pallet (1200), or rotated in the opposite direction to separate the lower pallet (1100) and the upper pallet (1200).

The upper pallet (1200) is configured to form a pallet assembly (1000) by being connected to the lower pallet (1100) with the upper portions of the secondary battery cells (1) loaded on the lower pallet (1200) covered, and various configurations are possible.

As an example, the upper pallet (1200) may include an upper plate (1210) having a planar shape identical to or similar to that of the lower pallet (1200).

The upper plate (1210) has a plane shape that is identical or similar to that of the lower pallet (1200), and an insertion hole (1230) into which the guide pin portion (1120) described above is inserted can be formed.

Meanwhile, considering that the upper pallet (1200) performs the injection and impregnation of the electrolyte while being coupled to the lower pallet (1200), an auxiliary electrolyte injection part (1220) coupled to the electrolyte injection port (21) of each secondary battery cell (1) can be installed at a position corresponding to each secondary battery cell (1).

The above auxiliary electrolyte injection unit (1220) is installed at a position corresponding to each secondary battery cell (1) and is configured to be connected to the electrolyte injection port (21) of the secondary battery cell (1) when the upper pallet (1200) is connected to the lower pallet (1100), and various configurations are possible.

As an example, the auxiliary electrolyte injection unit (1220) may include an auxiliary container (1221) having an injection port (1223) formed at the lower end to be inserted into the electrolyte injection port (21) of each secondary battery cell (1) and an inlet port (1222) formed at the upper end to which a main electrolyte injection unit (4120) described below is coupled.

The above auxiliary container (1221) is configured such that an injection port (1223) is formed at the lower end to be inserted into the electrolyte injection port (21) of each secondary battery cell (1), and an inlet port (1222) is formed at the upper end to which a main electrolyte injection port (4120) described later is coupled. The internal volume thereof can be determined by considering the amount of electrolyte to be injected into the secondary battery cell (1).

Meanwhile, the auxiliary electrolyte injection unit (1220) is fixedly connected to the upper plate (1210) constituting the upper pallet (1200).

At this time, as explained above, since the secondary battery cells (1) go in the thermal direction and the electrolyte injection ports (21) are located on the opposite side, the gap between the adjacent auxiliary electrolyte injection parts (1220) can also be minimized.

The above loading area (LA) is defined as an area where a plurality of secondary battery cells (1) are loaded from a loading tray (10) on which a plurality of secondary battery cells (1) are loaded onto a lower pallet (1100), and is set on a lower pallet moving line (200) along which the lower pallet (1100) moves.

Here, the lower pallet moving line (200) is a line along which the lower pallet (1100) moves, and any configuration is possible as long as it can transport the lower pallet (1100).

For example, the lower pallet moving line (200) may include a shuttle plate (not shown) that fixedly supports the lower pallet (1100) and a plate moving unit (not shown) that moves the shuttle plate between the loading area (LA) and the unloading area (ULA).

The above plate moving unit may include one or more guide rails that guide movement of the shuttle plate while supporting the shuttle plate, and a moving driving unit that moves the shuttle plate along the guide rail.

The above unloading area (ULA) is defined as an area where a plurality of secondary battery cells (1) are discharged to the outside from the lower pallet (1100), and is set on the lower pallet moving line (200) along which the lower pallet (1100) moves.

Meanwhile, the loading area (LA) and the unloading area (ULA) are areas where secondary battery cells (1) are loaded or unloaded, respectively, and a loading line (100) and an unloading line (900) can be connected.

That is, the secondary battery manufacturing system according to the present invention, as illustrated in FIG. 2, is installed adjacent to the lower pallet moving line (200), and includes a first transfer area (TA) for transferring a plurality of secondary battery cells (1) to the loading area (LA) of the lower pallet moving line (200), a tray loading area (TL) in which a loading tray (10) loaded with a plurality of secondary battery cells (1) is loaded from the outside, and at least one loading line (100) for moving the loading tray (10) between the first transfer area (TA) and the tray loading area (TL); A second transfer area (UTA) is installed adjacent to the lower pallet moving line (200) and receives a plurality of secondary battery cells (1) from the unloading area (ULA) of the lower pallet moving line (200), and a tray unloading area (TU) in which an unloading tray (10) loaded with a plurality of secondary battery cells (1) is discharged to the outside is set, and one or more unloading lines (900) in which the unloading tray (10) is moved between the second transfer area (UTA) and the tray unloading area (TU) are set.

The loading line (100) is installed adjacent to the lower pallet moving line (200), and includes a first transfer area (TA) for transferring a plurality of secondary battery cells (1) to the loading area (LA) of the lower pallet moving line (200), and a tray loading area (TL) for loading a loading tray (10) loaded with a plurality of secondary battery cells (1) from the outside, and the loading tray (10) is moved between the first transfer area (TA) and the tray loading area (TL), and various configurations are possible depending on the supply position of the secondary battery cells (1) to the loading area (LA) and the transfer structure of the loading tray (10).

For example, the loading line (100) may include a tray shuttle section in which the tray loading area (TL) is set at one end and a first transfer area (TA) is set at the other end, a loading tray (10) is installed, and a tray moving section that moves the tray shuttle section between the tray loading area (TL) and the first transfer area (TA).

The above tray moving unit is configured to move the tray shuttle unit between the tray loading area (TL) and the first transfer area (TA), and various configurations are possible depending on the structure for moving the tray shuttle unit.

The above tray moving unit may include one or more guide rails that guide the movement of the tray shuttle unit while supporting the loading tray (10), and a moving driving unit that moves the tray shuttle unit along the guide rail.

Meanwhile, the secondary battery cells (1) loaded through the loading line (100) may be secondary battery cells into which the electrolyte is injected for the first time, or secondary battery cells into which the electrolyte is injected for the second time with respect to the secondary battery cells (1) into which a preset amount of electrolyte is injected for the first time.

In addition, the loading line (100) can be configured to introduce the secondary battery cell (1) into which the electrolyte is injected first and the secondary battery cell (1) into which the electrolyte is injected secondarily separately.

At this time, the loading line (100) may include a first loading line (110) along which a loading tray (10) loaded with a plurality of secondary battery cells (1) into which the electrolyte is first injected is moved; and a second loading line (120) along which a loading tray (10) loaded with a plurality of secondary battery cells (1) into which the electrolyte is secondarily injected is moved after the electrolyte is first injected.

Meanwhile, the secondary battery cell (1) into which the electrolyte is to be injected secondarily after the electrolyte is injected first is introduced with a nail (22) attached to the electrolyte injection port (21) to prevent leakage of the electrolyte. Therefore, the nail (22) needs to be removed before being delivered to the electrolyte injection unit (400) described later.

Accordingly, it is preferable that the second loading line (120) be equipped with a nail removal unit (3100) that removes the nail (22) inserted into the electrolyte injection port (21) of the secondary battery cells (1).

The above nail removal unit (3100) is configured to remove a nail (22) inserted into an electrolyte injection port (21) of the secondary battery cells (1), and any configuration that can remove a nail is possible.

Meanwhile, the plurality of secondary battery cells (1) loaded through the loading tray (10) are square secondary batteries having a rectangular shape in the plane shape, with the electrolyte injection port (21) formed to one side from the center of the upper surface, as shown in FIG. 3a, and can be arranged in one or more rows so that the long sides are parallel.

At this time, if the electrolyte injection port (21) is located on the same side, when the electrolyte is injected from the electrolyte injection part (400) described later, the installation of the components for electrolyte injection corresponding to each secondary battery cell (1) is interfered with, so that the distance between the secondary battery cells (1) increases unnecessarily, increasing the footprint of the system, and at the same time, the size of the electrolyte injection part (400) and the electrolyte impregnation part (500) increases, which causes a problem in that the space for pressure conversion increases.

Accordingly, as shown in Fig. 3b, by positioning the electrolyte injection port (21) on the opposite side of the adjacent secondary battery cell (1) when injecting the electrolyte, the gap between the secondary battery cells (1) can be minimized.

To this end, the secondary battery manufacturing system according to the present invention may include a first cell rotation unit (2100) that rotates odd-numbered or even-numbered secondary battery cells (1) among the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200) so that the electrolyte injection port (21) is positioned on the opposite side.

The first cell rotation unit (2100) is configured to rotate odd or even secondary battery cells (1) among the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200), as shown in FIGS. 3a and 3b, so that the electrolyte injection port (21) is positioned on the opposite side. Various configurations are possible depending on the rotation structure of the cell (1).

For example, the first cell rotation unit (2100) may include a grip unit (not shown) that grips odd-numbered or even-numbered secondary battery cells (1) among the secondary battery cells (1) and a horizontal rotation unit (not shown) that horizontally rotates each of the secondary battery cells (1) gripped by the grip unit by 180°.

Meanwhile, the first cell rotation unit (2100) can be installed between the first transfer area (TA) and the tray loading area (TL) among the loading lines (100), as shown in FIG. 2.

In addition, the first cell rotation unit (2100) may be positioned at the rear side of the nail removal unit (3100) based on the transport direction of the tray (10) when installed in the second loading line (120).

Meanwhile, the secondary battery manufacturing system according to the present invention may include a first cell weight measuring unit (2300) that measures the weight of each of the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200).

The above first cell weight measuring unit (2300) is configured to measure the weight of each of the plurality of secondary battery cells (1) before they are loaded into the loading area (LA) of the lower pallet moving line (200), and various configurations are possible depending on the weight measurement configuration.

Meanwhile, the weight measured by the first cell weight measuring unit (2300) can be compared with the weight measured by the second cell weight measuring unit (2400) during the process of discharging to the unloading line (900) after completing electrolyte injection and impregnation, thereby allowing the amount of injected electrolyte to be measured.

The above unloading line (900) is installed adjacent to the lower pallet moving line (200), and is configured to have a second transfer area (UTA) for receiving a plurality of secondary battery cells (1) from the unloading area (ULA) of the lower pallet moving line (200), and a tray unloading area (TU) for discharging an unloading tray (10) loaded with a plurality of secondary battery cells (1) to the outside, and the unloading tray (10) is moved between the second transfer area (UTA) and the tray unloading area (TU), and various configurations are possible depending on the discharge position of the secondary battery cells (1) from the unloading area (ULA) and the transport structure of the unloading tray (10).

For example, the unloading line (900) may include a tray shuttle section in which a second transfer area (UTA) is set at one end and a tray unloading area (TU) is set at the other end, an unloading tray (10) is installed, and a tray moving section that moves the tray shuttle section between the second transfer area (UTA) and the tray unloading area (TU).

The above tray moving unit is configured to move the tray shuttle unit between the second transfer area (UTA) and the tray unloading area (TU), and various configurations are possible depending on the structure for moving the tray shuttle unit.

The above tray moving unit may include one or more guide rails that guide the movement of the tray shuttle unit while supporting the unloading tray (10), and a moving driving unit that moves the tray shuttle unit along the guide rail.

Meanwhile, in the secondary battery cell (1) that has completed electrolyte injection, the electrolyte injection port (21) needs to be sealed with a nail (22) to prevent leakage of the injected electrolyte.

Accordingly, the unloading line (900) may be equipped with a nail insertion unit (3200) for inserting nails (22) into the electrolyte injection ports (21) of a plurality of secondary battery cells (1) that have completed electrolyte injection.

The above nail insertion part (3200) is configured to insert a nail (22) into the electrolyte injection port (21) of a plurality of secondary battery cells (1) that have completed electrolyte injection and are installed in the unloading line (900), and various configurations are possible depending on the insertion structure of the nail.

Meanwhile, it is necessary to clean the electrolyte injection port (21) of the nail insertion part (3200) before nail insertion.

Accordingly, the unloading line (900) may be equipped with a cleaning unit (3900) that cleans the electrolyte injection port (21) before the nail (22) is inserted by the nail insertion unit (3200).

The above cleaning unit (3900) is installed in the unloading line (900) and is configured to clean the electrolyte injection port (21) before the nail (22) is inserted by the nail insertion unit (3200), and various configurations are possible.

For example, the cleaning unit (3900) may include, as shown in FIGS. 6 to 9b, a first roll (3921) around which a cleaning sheet (3910) is wound, a second roll (3921) around which a cleaning sheet (3910) that has been cleaned is wound, and a cleaning module (3930) that performs cleaning by bringing the cleaning sheet (3910) supplied from the first roll (3921) into contact with one or more secondary battery cells (1).

The above first roll (3921) is installed in the main body (3911) and is configured to supply the cleaning sheet (3910) by rotating the cleaning sheet (3921) by winding it in a roll shape, and various configurations are possible.

Here, the cleaning sheet (3921) may be any sheet that can clean the secondary battery cell (1), particularly the electrolyte injection port (21), by friction, and may be composed of non-woven fabric, etc.

The above second roll (3922) has a configuration similar to the first roll (3921) in that it is installed in the main body (3911) and a cleaning sheet (3910) that has been cleaned is wound by rotation.

The above cleaning module (3930) is configured to perform cleaning by bringing a cleaning sheet (3910) supplied from the first roll (3921) into contact with one or more secondary battery cells (1), and various configurations are possible.

For example, the cleaning module (3930) may include a pair of lower rollers (3931) installed to support the cleaning sheet (3910) with a size larger than the width so that it can rub against the upper surface of the secondary battery cell (1), and a pair of upper rollers (3932) installed with a space above the pair of lower rollers (3931) to vertically guide the cleaning sheet (3910) wound around the outer periphery of the pair of lower rollers (3931).

The above pair of lower rollers (3931) are configured to support the cleaning sheet (3910) with a size larger than the width so that they can rub against the upper surface of the secondary battery cell (1), and various configurations are possible.

For example, the pair of lower rollers (3931) may be installed with a sufficient gap so that the cleaning sheet (3910) can be rolled outward and rub against the upper surface of the secondary battery cell (1).

Here, it is preferable to use a roller with a smaller diameter than the other rollers for the pair of lower rollers (3931) in order to minimize the widthwise size.

The above pair of upper rollers (3932) are installed with a space above the pair of lower rollers (3931) and are configured to vertically guide the cleaning sheet (3910) wound around the outer periphery of the pair of lower rollers (3931), and various configurations are possible.

And the cleaning sheet (3910) can be moved by being wound inwardly about the pair of upper rollers (3932) and outwardly about the pair of lower rollers (3931).

Meanwhile, it is preferable that the cleaning module (3930) be installed corresponding to the secondary battery cell (10) loaded on the unloading tray (10).

However, a cleaning module (3930) having the above configuration may have limitations in minimizing the gap with an adjacent cleaning module (3930).

Accordingly, the cleaning module (3930) can partially clean the secondary battery cells (10) by skipping one or more secondary battery cells (1), instead of cleaning all of the secondary battery cells (10) loaded on the unloading tray (10), as shown in FIG. 6.

At this time, the cleaning unit (3900) may be additionally provided to clean the remaining secondary battery cells (10) that have not been cleaned.

For example, when an even number of secondary battery cells (1), for example, six, are loaded on the unloading tray (10), the even or odd number of secondary battery cells (1) can be cleaned first by the first cleaning unit, and then the remaining secondary battery cells (1) can be cleaned by the second cleaning unit.

Here, the unloading tray (10) is arranged in rows in the width direction as shown in Fig. 3a, and its movement direction can also be moved in the width direction.

Meanwhile, the cleaning module (3930) may include a pressurizing unit (3939) that presses the cleaning sheet (3910) toward the secondary battery cell (10) by vertical movement to increase the cleaning effect on the secondary battery cell (10).

The above pressurizing part (3939) is configured to pressurize the cleaning sheet (3910) toward the secondary battery cell (10) by vertical movement in order to increase the cleaning effect on the secondary battery cell (10), and various configurations are possible.

For example, the pressurizing unit (3939) may be configured as a pneumatic cylinder that pressurizes the cleaning sheet (3910) toward the secondary battery cell (10) by vertical movement to increase the cleaning effect on the secondary battery cell (10).

In addition, the pressurizing part (3939) may be configured to include a pressurizing head that moves the pressurizing head downward and an elastic part that is coupled to the pressurizing head and cushions the cleaning seeker (3910) when it comes into contact with the surface of the secondary battery cell (10).

By the above configuration, the cleaning module (3930) can maximize the cleaning effect by the cleaning sheet (3910) when it comes into contact with the upper surface of the secondary battery cell (1).

Meanwhile, the cleaning module (3930) needs to optimally correspond to the gap between the secondary battery cells (1) loaded in the unloading module (10).

Accordingly, it is desirable that a pair of lower rollers (3931) constituting the cleaning module (3930) be as close as possible to an adjacent pair of lower rollers (3931).

As a structure that is as close as possible, the cleaning module (3930) may be installed with only one upper roller (3932) as a modified example, as shown in FIGS. 9a and 9b.

When only one upper roller (3932) is installed as described above, the gap between a pair of lower rollers (3931) and an adjacent pair of lower rollers (3931) can be minimized.

Meanwhile, it is more effective for the cleaning unit (3900) to clean the secondary battery cell (1) by reciprocating movement based on a preset length rather than moving the cleaning sheet (3910) in one direction, i.e. in the direction of winding around the second roll (3922).

To this end, the cleaning unit (3900) may additionally include a pair of reciprocating moving units (3990) installed at the front and rear of the cleaning module (3930) based on the direction of movement in which the cleaning sheet (3910) is wound around the second roll (3922) and moves the cleaning sheet (3910) reciprocally.

The above reciprocating moving part (3990) is installed in front and rear of the cleaning module (3930) based on the direction of movement in which the cleaning sheet (3910) is wound around the second roll (3922), and is configured to reciprocate the cleaning sheet (3910), and various configurations are possible.

For example, the reciprocating part (3990) may include a pair of base rollers (3991, 3992) on which a cleaning sheet (3910) is wound in a 'U' shape, as shown in FIGS. 6 and 8, and a reciprocating roller (3993) that reciprocates in a direction perpendicular to an imaginary line connecting the centers of the pair of base rollers (3991, 3992) between the pair of base rollers (3991, 3992).

The above pair of base rollers (3991, 3992) are configured such that the cleaning sheet (3910) is wound in a 'U' shape, and various configurations are possible.

The above reciprocating roller (3993) is configured to reciprocate in a direction perpendicular to an imaginary line connecting the centers of the pair of base rollers (3991, 3992) between the pair of base rollers (3991, 3992), and various configurations are possible.

Here, the reciprocating roller (3993), as illustrated in FIG. 8, can determine the reciprocating movement length ((H2-H1)×2) of the cleaning sheet (3910) by reciprocating between a distance of H1 and a distance of H2 with respect to the pair of base rollers (3991, 3992).

With the above configuration, when the reciprocating roller (3993) of the first reciprocating roller (3990) close to the first roller (3921), i.e., the reciprocating roller (3990) of the first reciprocating roller (3990), moves to the position of H2, the cleaning sheet (3910) is released from the first roller (3921) by the length of the reciprocating movement.

And the first roller (3921) stops rotating, and the reciprocating roller (3993) of the reciprocating moving part (3990) close to the second roller (3922), hereinafter referred to as the second reciprocating moving part (3990), reciprocates from the position of H1 to the position of H2. At this time, when the reciprocating roller (3993) of the first reciprocating moving part (3990) moves conversely from the position of H2 to the position of H1, the cleaning sheet (3910) causes friction while reciprocating on the surface of the secondary battery cell (1).

And when the cleaning sheet (3910) undergoes a preset number of frictions, the second roller (3922) rotates to wind the cleaning sheet (3910) that has undergone friction, and at this time, the first roller (3921) also rotates to position the cleaning sheet (3910) that has not undergone friction in the first reciprocating moving part (3990).

Meanwhile, the main body (3911) on which the first roll (3921) and the second roll (3922) are installed can have multiple rolls (3912, 3919) installed in appropriate locations on the front and rear sides of the cleaning module (3930) for smooth movement and tension control of the cleaning sheet (3921).

The above plurality of rolls (3912, 3919) are installed in the main body (3911) to ensure smooth movement and tension control of the cleaning sheet (3921), and their installation positions and numbers can be appropriately selected.

Meanwhile, as described above, in order to minimize the gap between the secondary battery cells (1) loaded on the pallet assembly (1000), the secondary battery cells (1) are rotated by the first cell rotation part (2100) so that the electrolyte injection port (21) is positioned on the opposite side from the adjacent secondary battery cell (1), as shown in FIG. 3b.

Accordingly, the secondary battery cells (1) contained in the unloading tray (10) need to be rotated again, as shown in Fig. 3a.

Accordingly, the secondary battery manufacturing system according to the present invention may include a second cell rotation unit (2200) that rotates odd-numbered or even-numbered secondary battery cells (1) among the plurality of secondary battery cells (1) so that the electrolyte injection ports (21) of the plurality of secondary battery cells (1) are positioned on the same side after being delivered from the unloading area (ULA) of the lower pallet moving line (200).

The second cell rotation unit (2200) is configured to rotate odd or even secondary battery cells (1) among the plurality of secondary battery cells (1) so that the electrolyte injection ports (21) of the secondary battery cells (1) rotated by the first cell rotation unit (2100), i.e., the plurality of secondary battery cells (1), are positioned on the same side. Various configurations are possible depending on the rotation structure of the cells (1).

For example, the second cell rotation unit (2200) may include a grip unit (not shown) that grips odd-numbered or even-numbered secondary battery cells (1) among the secondary battery cells (1) and a horizontal rotation unit (not shown) that horizontally rotates each of the secondary battery cells (1) gripped by the grip unit by 180°.

Meanwhile, the second cell rotation unit (2200) can be installed between the second transfer area (UTA) and the tray unloading area (TU) among the unloading lines (900), as shown in FIG. 2.

In particular, the second cell rotation unit (2200) is preferably installed on the front side of the cleaning unit (3900) with respect to the movement direction of the unloading tray (10), as shown in FIG. 2.

Meanwhile, the secondary battery manufacturing system according to the present invention may include a second cell weight measuring unit (2400) that measures the weight of each of the plurality of secondary battery cells (1) after receiving them from the unloading area (ULA) of the lower pallet moving line (200).

The above second cell weight measuring unit (2400) is configured to measure the weight of each of the plurality of secondary battery cells (1) after receiving them from the unloading area (ULA) of the lower pallet moving line (200), and various configurations are possible depending on the weight measuring structure.

Meanwhile, the weight measured by the second cell weight measuring unit (2400) can be used to measure the weight of the electrolyte injected into each secondary battery cell (1) by calculating the difference between the weight measured by the first weight measuring unit (2300) described above.

At this time, the amount of electrolyte injected during secondary electrolyte injection can be adjusted based on the measured weight.

The above pallet combination area (300) is installed on one side of the lower pallet movement line (200) and is configured to receive the lower pallet (1100) on which the plurality of secondary battery cells (1) are loaded, and then cover the upper portions of the plurality of secondary battery cells (1) loaded on the lower pallet (1100) by combining the upper pallet (1200) with the lower pallet (1100), thereby forming a pallet assembly (1000). The pallet combination area (300) may be set on the lower pallet movement line (200).

In the above pallet combination area (300), the upper pallet (1200) is positioned on the lower pallet (1100) so as to cover the upper portions of the plurality of secondary battery cells (1) loaded on the lower pallet (1100), and then the locking unit (1130) described above is operated to combine the lower pallet (1100) and the upper pallet (1200) to form one pallet assembly (1000).

The above electrolyte injection unit (400) is configured to receive the pallet assembly (1000) from the pallet combination area (300) and inject electrolyte into each secondary cell (1) through the upper pallet (1200), and various configurations are possible.

The above electrolyte injection unit (400) may include a vacuum chamber (not shown) that forms a preset pressure, for example, an injection vacuum pressure, when the pallet assembly (1000) is introduced inside, a support unit that supports the pallet assembly (1000) from the bottom side, and an electrolyte injection unit (4100) that is installed in the vacuum chamber and injects electrolyte through the auxiliary electrolyte injection unit (1220).

The above vacuum chamber can be configured in various ways depending on the introduction and support of the pallet assembly (1000) that forms a preset pressure, for example, an injection vacuum pressure, when the pallet assembly (1000) is introduced inside.

The above support member is configured to support the pallet assembly (1000) from the bottom side, and can have various configurations depending on the support, raising and lowering of the pallet assembly (1000).

The above electrolyte injection unit (4100) is configured to be installed in the vacuum chamber and inject electrolyte through the auxiliary electrolyte injection unit (1220), and various configurations are possible.

For example, the electrolyte injection unit (4100) may include a plurality of main electrolyte injection units (4120) that are installed in the main body (4110) to correspond to the main body (4110) and the auxiliary electrolyte injection units (1220) installed in the upper pallet (1200) of the pallet assembly (1000) and inject electrolyte together with the auxiliary electrolyte injection units (1220).

The above main body (4110) is configured to have a plurality of electrolyte injection parts (4120) installed, and a pipe (not shown) for electrolyte injection, a configuration for the operation of the valve module (4140) described below, etc. can be installed.

In addition, the main body (4110) can be installed in a vacuum chamber so as to move up and down with respect to the upper pallet (1200) of the pallet assembly (1000).

At this time, the main body (4110) may have an insertion hole (not shown) formed into which a guide pin portion (1120) penetrating the insertion hole (1230) of the upper pallet (1200) of the pallet assembly (1000) is inserted.

The above insertion hole can align the joining positions of the main body (4110) and the pallet assembly (1000) by inserting a guide pin portion (1120) that penetrates the insertion hole (1230) of the upper pallet (1200) of the pallet assembly (1000).

The above-mentioned plurality of main electrolyte injection units (4120) are installed in the main body (4110) corresponding to the auxiliary electrolyte injection unit (1220) installed in the upper pallet (1200) of the pallet assembly (1000) and are configured to inject electrolyte together with the auxiliary electrolyte injection unit (1220), and various configurations are possible.

For example, the main electrolyte injection unit (4120) may be configured as a container having an electrolyte injection unit provided on the upper side according to the amount of electrolyte injected into the secondary battery cell (1) and an outlet (4122) coupled with an inlet (1222) of an auxiliary electrolyte injection unit (1220) on the lower side.

And the above-mentioned main electrolyte injection part (4120) is installed so as to penetrate vertically, and an opening/closing member (4130) that opens and closes the discharge port (4122) by moving up and down can be installed so as to be able to move up and down.

Furthermore, the upper part of the opening/closing member (4130) may be joined with an electrolyte injection tube (4140) having one or more electrolyte injection holes (4141) formed therein.

The above electrolyte injection tube (4140) is configured such that one or more electrolyte injection holes (4141) are formed at the upper end of the opening/closing member (4130), and various configurations are possible.

For example, the electrolyte injection tube (4140) may be formed integrally with the opening/closing member (4130).

Meanwhile, the electrolyte injection unit (4100) can be configured in various ways, such as being installed inside or outside the vacuum chamber or across the inside and outside.

Below, the electrolyte injection by the electrolyte injection part (4100) as described above will be described.

First, the electrolyte injection unit (4100) moves up and down relative to the pallet assembly (1000), for example, the pallet assembly (1000) moves upward so that the discharge port (4122) of the main electrolyte injection unit (4120) and the inlet port (1222) of the auxiliary electrolyte injection unit (1220) are tightly coupled to each other.

Then, gas such as air is injected through the electrolyte injection tube (4140) to first check whether there is a leak in the secondary battery cell (1).

When it is confirmed that there is no leak in the secondary battery cell (1), the pallet assembly (1000) is moved downward and the inside of the vacuum chamber forms a preset injection vacuum pressure.

At this time, due to the formation of injection vacuum pressure, the auxiliary electrolyte injection part (1220) and the interior of the secondary battery cell (1) also enter an injection vacuum pressure state.

Meanwhile, at the same time as the vacuum pressure is formed, the electrolyte is injected into the main electrolyte injection unit (4100) through the electrolyte injection tube (4140).

When the above vacuum pressure formation is completed, the pallet assembly (1000) moves upward so that the discharge port (4122) of the main electrolyte injection unit (4120) and the inlet port (1222) of the auxiliary electrolyte injection unit (1220) are tightly coupled to each other.

And the above opening/closing member (4130) rises to open the discharge port (4122) of the electrolyte injection part (4120).

When the outlet (4122) of the above electrolyte injection part (4120) is opened, the auxiliary electrolyte injection part (1220) and the interior of the secondary battery cell (1) are in a vacuum pressure state, and the electrolyte is injected into the secondary battery cell (1) through the auxiliary electrolyte injection part (1220) by the pressure difference.

Meanwhile, when the electrolyte injection is completed, the pallet assembly (1000) moves downward and the pallet assembly (1000) is transferred to the outside, i.e., to the electrolyte impregnation section (500).

The above electrolyte impregnation unit (500) is configured to form preset pressure conditions so that the electrolyte is impregnated into the separator of the secondary battery cell (1) by receiving the pallet assembly (1000) from the electrolyte injection unit (400) after the electrolyte is injected, and various configurations are possible.

As an example, the electrolyte impregnation unit (500) may include an impregnation chamber (510) that forms preset pressure conditions.

And the impregnation chamber (510) may include, as shown in FIG. 5b, a pallet support member (511) that supports the pallet assembly (1000); and a chamber body (512) that rises from the pallet support member (511) when the pallet assembly (1000) is introduced and descends when the impregnation process is performed to form a sealed impregnation space (S) together with the pallet support member (511).

Meanwhile, considering the efficiency of the processing process, it is preferable that the pallet assembly (1000) in which the impregnation process is performed by the electrolyte impregnation unit (500) is processed by stacking multiple pallets rather than one.

Accordingly, the secondary battery manufacturing device according to the present invention may include a pallet assembly stacking unit (520) in which a plurality of pallet assemblies (1000) are introduced in a state of being stacked vertically in the impregnation chamber (510) as illustrated in FIG. 2, and in which a plurality of pallet assemblies (1000) are stacked vertically adjacent to the impregnation unit (500).

The above pallet assembly stacking unit (520) is configured such that a plurality of pallet assemblies (1000) are introduced into the impregnation chamber (510) in a state of being stacked vertically, and a plurality of pallet assemblies (1000) are stacked vertically adjacent to the impregnation unit (500), and various configurations are possible.

As shown in FIG. 5A, the pallet assembly stacking unit (520) may include a lifting and lowering unit that supports the lower pallet (1100) of the pallet assembly (1000) using a grip member inserted from the side to raise and lower one or more pallet assemblies (1000), and an alignment unit that aligns the horizontal position of the pallet assemblies (1000) to align the upper and lower stacking positions of the pallet assemblies (1000).

At this time, when the pallet assemblies (1000) are stacked vertically, the upper part of the guide pin part (1230) is inserted into the insertion groove formed on the bottom surface of the guide pin part (1120) of the lower pallet (1100) of the pallet assembly (1000) located on the upper side as described above, so that the pallet assemblies (1000) can be stacked vertically.

And the number of layers of the above pallet assembly (1000) can be appropriately selected in consideration of the load that can be transferred by the transfer robot (2610, 2620), the speed of electrolyte injection and impregnation, etc., and in the case of the embodiment of the present invention, it can be layered in three stages.

Meanwhile, the number and arrangement of the electrolyte impregnation unit (500) and the pallet assembly stacking unit (520) need to be appropriately configured in consideration of the movement of the pallet assembly (1000), electrolyte injection, and impregnation speed.

In particular, it is necessary to optimize the transport of the pallet assembly (1000) to the electrolyte injection unit (400), further to the electrolyte impregnation unit (500) and the pallet assembly stacking unit (520).

Accordingly, the secondary battery manufacturing system according to the present invention includes a lower pallet moving line (200) and an upper pallet moving line (700) arranged parallel to each other, a pallet assembly moving line (800) arranged parallel to the upper pallet moving line (700) and adjacent to the upper pallet moving line (700), and along which the pallet assembly (1000) is moved, and the electrolyte impregnation unit (500) may be installed in multiple numbers facing the upper pallet moving line (700) with respect to the pallet assembly moving line (800).

For example, at one end of the pallet assembly moving line (800), one or more electrolyte injection units (400), for example, a pair of electrolyte injection units (400) with the pallet assembly moving line (800) in between, may be installed.

And the above electrolyte impregnation part (500) can be installed in multiple numbers, for example, four, from the other end based on the electrolyte injection part (400).

And between the electrolyte impregnation section (500) and the electrolyte injection section (400), three electrolyte stacking sections (520) can be installed.

Meanwhile, during the transport process of the pallet assembly (1000), the pallet assembly (1000) needs to be temporarily loaded. To this end, a buffer section (590) in which the pallet assembly (1000) is temporarily loaded may be installed.

The above pallet assembly movement line (800) is a line in which a pallet assembly (1000) is moved by a transfer robot (2610, 2620), and various configurations such as rails are possible depending on the movement structure of the transfer robot (2610, 2620).

Here, the above-mentioned transport robot (2610, 2620) is a robot that transports one or more pallet assemblies (1000), and various configurations are possible depending on the support structure and transport of the pallet assembly (1000).

In addition, the above-mentioned transport robots (2610, 2620) may be installed in multiple units, such as two units, taking into account the transport efficiency of the pallet assembly (1000).

Meanwhile, the secondary battery manufacturing system according to the present invention may include a pallet separation unit (600) in which, after the electrolyte is impregnated, the upper pallet (1200) is separated from the pallet assembly (1000) and transferred to the pallet joining area (300) through the upper pallet moving line (700) and the remaining lower pallet (1100) is transferred to the lower pallet moving line (200).

The above pallet separation unit (600) is configured such that after the electrolyte is impregnated, the upper pallet (1200) is separated from the pallet assembly (1000) and transferred to the pallet joining area (300) through the upper pallet moving line (700) and the remaining lower pallet (1100) is transferred to the lower pallet moving line (200). Various configurations are possible depending on the joining structure of the upper pallet (1200) and the lower plate (1100).

Meanwhile, the pallet separation unit (600) can operate for each pallet assembly (1000), and a stacking release unit (690) for releasing the stacked pallet assemblies (1000) from their stacked state is installed between the pallet separation unit (600) and the upper pallet moving line (700).

The above-described de-stacking unit (690) is operable for each pallet assembly (1000), and is configured to release the stacked state of the stacked pallet assemblies (1000) between the pallet separating unit (600) and the upper pallet moving line (700), and can be configured similarly to the pallet stacking unit (590) described above.

At this time, the above-mentioned de-stacking unit (690) may be installed in two, or in multiple, units along the upper pallet moving line (700) in consideration of the efficiency of de-stacking the pallet assembly (1000).

The above pallet separation unit (600) can release the combined state of the locking unit (1130) described above, that is, release the combined state of the upper pallet (1200) and the lower plate (1100) by rotating the load unit (1131).

When the connection between the upper pallet (1200) and the lower plate (1100) is released, the upper pallet (1200) is separated from the lower pallet (1100) and transferred to the pallet connection area (300).

At this time, it is necessary to clean the upper pallet (1200), especially the auxiliary electrolyte injection part (1220).

Accordingly, an upper pallet cleaning unit (2500) for cleaning the upper pallet (1200) may be installed between the pallet separation unit (600) and the pallet combination area (300).

The above upper pallet cleaning unit (2500) is configured to clean the upper pallet (1200) between the pallet separation unit (600) and the pallet combination area (300), and various configurations are possible.

For example, the upper pallet cleaning unit (2500) may be configured similarly to the electrolyte injection unit (4100) described above.

However, considering that the upper pallet cleaning unit (2500) cleans by spraying a cleaning fluid such as air, nitrogen, or a cleaning liquid without injecting an electrolyte, any configuration that can spray a cleaning fluid into the auxiliary electrolyte injection unit (1220) is possible.

In addition, it goes without saying that the upper pallet cleaning unit (2500) may be configured to clean the upper pallet (1200) by immersing it in a cleaning solution.

The above is only a description of some of the preferred embodiments that can be implemented by the present invention, and therefore, as is well known, the scope of the present invention should not be construed as being limited to the above embodiments, and the technical ideas of the present invention described above and the technical ideas underlying them are all included in the scope of the present invention.

100: Loading line 200: Lower pallet moving line
300: Pallet joint area 400: Electrolyte injection area
500: Electrolyte impregnation section 600: Pallet separation section
900 : Unloading line

Claims (14)

A loading area (LA) for loading a plurality of secondary battery cells (1) onto a lower pallet (1100) from a loading tray (10) on which a plurality of secondary battery cells (1) are loaded, and an unloading area (ULA) for discharging a plurality of secondary battery cells (1) to the outside from the lower pallet (1100) are set, and a lower pallet moving line (200) for moving the lower pallet (1100) between the loading area (LA) and the unloading area (ULA);
A pallet joining area (300) installed on one side of the lower pallet moving line (200) to receive the lower pallet (1100) on which the plurality of secondary battery cells (1) are loaded, and then connects the upper pallet (1200) to the lower pallet (1100) to cover the upper portions of the plurality of secondary battery cells (1) loaded on the lower pallet (1100), thereby forming a pallet assembly (1000);
At least one electrolyte injection unit (400) that receives the pallet assembly (1000) from the pallet combination area (300) and injects electrolyte into each secondary cell (1) through the upper pallet (1200);
One or more electrolyte impregnation units (500) that receive the pallet assembly (1000) from the electrolyte injection unit (400) after the electrolyte is injected and form preset pressure conditions so that the electrolyte is impregnated into the separator of the secondary battery cell (1);
A secondary battery manufacturing system characterized by including a pallet separation unit (600) in which, after being impregnated with an electrolyte, the upper pallet (1200) is separated from the pallet assembly (1000) and transferred to the pallet joining area (300) through the upper pallet moving line (700) and the remaining lower pallet (1100) is transferred to the lower pallet moving line (200). In claim 1,
The above-mentioned plurality of secondary battery cells (1) are square secondary batteries having a rectangular shape in the plane shape, with the electrolyte injection port (21) formed to one side from the center of the upper surface, and are arranged in one or more rows so that the long sides are parallel.
A secondary battery manufacturing system characterized by including a first cell rotation unit (2100) that rotates odd-numbered or even-numbered secondary battery cells (1) among the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200) so that the electrolyte injection port (21) is positioned on the opposite side. In claim 2,
A secondary battery manufacturing system characterized by including a second cell rotation unit (2200) that rotates odd-numbered or even-numbered secondary battery cells (1) among a plurality of secondary battery cells (1) so that the electrolyte injection ports (21) of the plurality of secondary battery cells (1) are positioned on the same side after being delivered from the unloading area (ULA) of the lower pallet moving line (200). In any one of claims 1 to 3,
A secondary battery manufacturing system characterized by including a first cell weight measuring unit (2300) that measures the weight of each of the plurality of secondary battery cells (1) before being loaded into the loading area (LA) of the lower pallet moving line (200). In claim 4,
A secondary battery manufacturing system characterized by including a second cell weight measuring unit (2400) that measures the weight of each of the plurality of secondary battery cells (1) after receiving them from the unloading area (ULA) of the lower pallet moving line (200). In any one of claims 1 to 3,
The above electrolyte impregnation part (500) is
A secondary battery manufacturing system characterized by including an impregnation chamber (510) that forms preset pressure conditions. In claim 6,
The above impregnation chamber (510) is
A pallet support member (511) supporting the above pallet assembly (1000);
A secondary battery characterized by including a chamber body (512) that rises from the pallet support member (511) when the pallet assembly (1000) is introduced and descends when the impregnation process is performed to form a sealed impregnation space (S) together with the pallet support member (511). In claim 6,
A plurality of pallet assemblies (1000) are introduced into the above impregnation chamber (510) in a state of being stacked vertically.
A secondary battery manufacturing system characterized by including a pallet assembly stacking section (520) in which a plurality of pallet assemblies (1000) are stacked vertically adjacent to the impregnation section (500). In any one of claims 1 to 3,
The above lower pallet moving line (200) and the above upper pallet moving line (700) are arranged parallel to each other.
It includes a pallet assembly moving line (800) that is arranged parallel to the upper pallet moving line (700) and adjacent to the upper pallet moving line (700) and on which the pallet assembly (1000) is moved.
A secondary battery manufacturing system characterized in that the electrolyte impregnation unit (500) is installed in multiple numbers facing the upper pallet movement line (700) with the pallet assembly movement line (800) as the standard. In any one of claims 1 to 3,
A first transfer area (TA) installed adjacent to the lower pallet moving line (200) and transferring a plurality of secondary battery cells (1) to the loading area (LA) of the lower pallet moving line (200) and a tray loading area (TL) in which a loading tray (10) loaded with a plurality of secondary battery cells (1) is loaded from the outside are set, and at least one loading line (100) in which the loading tray (10) is moved between the first transfer area (TA) and the tray loading area (TL);
A secondary battery manufacturing system characterized in that it comprises a second transfer area (UTA) installed adjacent to the lower pallet moving line (200) and receiving a plurality of secondary battery cells (1) from the unloading area (ULA) of the lower pallet moving line (200), a tray unloading area (TU) in which an unloading tray (10) loaded with a plurality of secondary battery cells (1) is discharged to the outside, and at least one unloading line (900) in which the unloading tray (10) is moved between the second transfer area (UTA) and the tray unloading area (TU). In claim 10,
The above loading line (100) is
A first loading line (110) on which a loading tray (10) loaded with a plurality of secondary battery cells (1) into which electrolyte is first injected is moved;
A secondary battery manufacturing system characterized by including a second loading line (120) in which a loading tray (10) loaded with a plurality of secondary battery cells (1) into which an electrolyte is first injected and then a second electrolyte is injected is moved. In claim 11,
The second loading line (120) is a secondary battery manufacturing system characterized in that a nail removal unit (3100) is installed to remove nails (22) inserted into the electrolyte injection ports (21) of the secondary battery cells (1). In claim 10,
The above unloading line (900) is a secondary battery manufacturing system characterized in that a nail insertion unit (3200) is installed to insert nails (22) into the electrolyte injection ports (21) of a plurality of secondary battery cells (1) that have completed electrolyte injection. In claim 13,
A gear battery manufacturing system characterized in that a cleaning unit (3900) is installed to clean the electrolyte injection port (21) before the nail (22) is inserted by the nail insertion unit (3200).

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