KR102627769B1 - Battery carrying tray - Google Patents

Abstract

The present invention relates to a battery transport tray used when transferring between processes in a production line or when shipping a finished product. The battery transport tray includes a box-shaped outer frame having a plurality of long grooves on the bottom surface; A mounting unit mounted on the outer frame via the long groove and having a plurality of slots into which both left and right ends of the battery are inserted and supported, and a first seating unit into which the lower end of the cell of the battery is seated; and a plurality of fastening members for coupling the mounting portion to the long groove, wherein the mounting portion is provided symmetrically on both sides within the outer frame and is arranged to have a predetermined distance between the batteries. It includes a pair of insert assemblies that are slidably fixed to the long groove as the width changes, and a first fastening groove is provided at a position among the first seating portions where the fastening member is coupled, and the first fastening groove is The head of the fastening member is formed to a depth that can be accommodated inside, and at the same time, it is formed only in a partial area of the first seating portion so that the bottom of the cell of the battery can be supported.

Description

Battery carrying tray {BATTERY CARRYING TRAY}

The present invention relates to a battery transport tray, and particularly to a battery transport tray used when transferring between processes in a production line or when shipping a finished product. The battery to which the tray is applied specifically refers to a pouch cell type secondary battery.

Recently, lithium ions generate electricity by moving between the anode and cathode in various products such as IT products such as smartphones, laptops, tablet PCs, and auxiliary batteries, as well as hybrid electric vehicles and energy storage systems (ESS). Pouch cell type secondary batteries are widely used.

Figure 1 shows a structural diagram of a typical pouch cell-type secondary battery 10, which typically consists of a cell 11 in which power is stored, a pouch 12 surrounding the cell, and electrode leads 13 for charging and discharging. The thickness of the cell 11 is relatively thick, 8 to 15 t, and the electrode lead 13 is welded to the periphery of the cell 11 to form a tab weld portion 14. The tab weld portion 14 becomes thicker than the thickness of the surrounding pouch 12. Typically, the pouch cell-type secondary battery (hereinafter abbreviated as 'battery') can be divided into unidirectional batteries formed in one direction, in addition to the bidirectional battery shown in FIG. 1, which is formed in both directions according to the formation direction of the leads for charging and discharging. You can. In addition, the batteries are manufactured in various shapes according to product specifications such as thickness, width, and lead height, and are generally manufactured in a thin shape so that multiple batteries can be electrically connected and used in a limited space.

Conventionally, in the battery production line, a battery transport tray capable of accommodating a large number of thin batteries upright is used as a means of storing and safely transporting batteries during transfer between processes or when shipping a finished product. Generally, a battery transport tray consists of an outer frame and a slot-type mounting part mounted therein, and the slot-type mounting part accommodates a plurality of batteries.

Traditional battery transport trays have an integrated outer frame and battery mounting part, so it was common for the entire tray to be manufactured separately for each product specification such as battery width, thickness, or lead height. However, recently, the outer frame and battery mounting part have been assembled in an integrated form. It is proposed in a form that can be manufactured and applied to mounting and transporting batteries of various specifications without separate manufacturing or replacement of tray components. Examples of battery transport trays having such a prefabricated mounting unit are disclosed in Republic of Korea Patent No. 10-1839120, Republic of Korea Patent No. 10-2094854, and Republic of Korea Patent Publication No. 10-2021-0007271 filed by the present applicant. .

In the case of Republic of Korea Patent No. 10-1839120, the battery mounting part is assembled with bolts from the bottom of the outer frame, and workability is significantly reduced because the tray must be turned over to change the model. In the case of Republic of Korea Patent No. 10-2094854, the battery As the mounting part is assembled from the side of the outer frame, the straight alignment of the inserts that make up the battery mounting part is not satisfactory, which may increase the possibility of damage to the mounted battery. Additionally, there is a limit to increasing the size of the outer frame for side assembly. In the case of Publication Patent No. 10-2021-0007271, the battery mounting part is assembled from the upper part of the outer frame, and although it compensates for the disadvantages of the bottom or side assembly form described above, it does not provide a sufficient seating surface when accommodating a large battery and does not provide a sufficient seating surface for a small battery. Even in the case of accommodation, there is a constant problem that the surface element on which the battery can be seated in the slot constituting the battery mounting part is reduced to secure the bolt assembly part, so there is a possibility that the mounted battery will be damaged.

Republic of Korea Patent No. 10-1839120 Republic of Korea Patent No. 10-2094854 Republic of Korea Patent Publication No. 10-2021-0007271

The present invention is a tray that can transport and store batteries of various specifications. In particular, in a battery transport tray that has a form of combining a conventional battery mounting portion from the top, workability in the battery model change process is further improved, and at the same time, the battery size is improved. Regardless, the goal is to provide a battery transport tray that can effectively prevent damage to the battery by securing a sufficient seating area.

The gist of the present invention related to the above-mentioned problem is the same as described in the claims below.

A battery transport tray according to the present invention includes a box-shaped outer frame having a plurality of long grooves on the bottom surface; A mounting unit mounted on the outer frame via the long groove and having a plurality of slots into which both left and right ends of the battery are inserted and supported, and a first seating unit into which the lower end of the cell of the battery is seated; and a plurality of fastening members for coupling the mounting portion to the long groove, wherein the mounting portion is provided symmetrically on both sides within the outer frame and is arranged to have a predetermined distance between the batteries. It includes a pair of insert assemblies that are slidably fixed to the long groove as the width changes, and a first fastening groove is provided at a position among the first seating portions where the fastening member is coupled, and the first fastening groove is The head of the fastening member is formed to a depth that can be accommodated inside, and at the same time, it is formed only in a partial area of the first seating portion so that the bottom of the cell of the battery can be supported.

The insert assembly includes an insert having the plurality of slots; and an insert base provided with the first seating part and fixed to the long groove by the fastening member in a state in which the insert is assembled.

The insert and the insert base may be assembled in a snap fit form.

The lower part of the insert base may be provided with a plurality of T-shaped protrusions for slidingly fixing the insert base when inserted into the long groove.

The fastening member is made of bolts and nuts assembled in the upper and lower directions of the long groove, and in the assembled state, the head of the bolt is located inside the first fastening groove and the nut is located on the bottom surface of the outer frame. It may be located inside and hidden.

The first fastening groove may have an open side structure.

The mounting portion further includes a center base provided between the pair of insert assemblies, fixed to the outer frame through a long groove, and provided with a second seating portion on which the middle of the lower end of the battery cell is seated, and the second seating portion A second fastening groove is provided at a position where the fastening member is coupled among the parts, and the second fastening groove is formed to a depth that allows the head of the fastening member to be accommodated therein, and at the same time, the bottom of the cell of the battery is supported. It may be formed only in a partial area of the second seating portion so that the second seating portion can be installed.

The lower part of the center base may be provided with a plurality of T-shaped protrusions for slidingly fixing the center base while inserted into the long groove.

The fastening member is made of bolts and nuts assembled in the upper and lower directions of the long groove, and in the assembled state, the head of the bolt is located inside the second fastening groove and the nut is located on the bottom surface of the outer frame. It may be located inside and hidden.

The second fastening groove may have an open side structure.

According to the battery transport tray of the present invention, a special coupling structure between the outer frame and the mounting unit, for example, a battery model based on the shapes of each of the fastening member, long groove, first fastening groove, and second fastening groove, and the shape of their mutual connection. Workability in the change process can be significantly improved. In addition, the battery transport tray has a seating portion supporting the bottom of the battery cell in the mounting portion, that is, an optional second seating portion of the center base is added, or a first seating portion of the insert base and a second seating portion of the center base are each added. Despite the formation of the first fastening groove and the second fastening groove in the tray, the area supporting the bottom area of the battery cell is sufficiently secured without being damaged, effectively preventing the risk of the battery stored inside the tray being damaged by external shock, etc. during the handling process. can do.

Figure 1 is a structural diagram of a typical pouch cell type secondary battery.
Figure 2 is a perspective view of a battery transport tray according to an embodiment of the present invention.
Figure 3 is an exploded perspective view of a battery transport tray according to an embodiment of the present invention.
Figure 4 is a top and bottom view of an outer frame according to an embodiment of the present invention.
5 is a top view, front view, rear view, bottom view, and side view of an insert according to an embodiment of the present invention.
Figure 6 is a top view, front view, rear view, bottom view, and bottom perspective view of an insert base according to an embodiment of the present invention.
Figure 7 is a diagram of the assembly method between the insert and the insert base.
Figure 8 is an enlarged view of part A of Figure 6.
Figure 9 is a diagram showing the process of fastening the insert base of Figure 6 to the outer frame of Figure 4.
10 is a top view, front view, rear view, bottom view, and side view of a center base according to an embodiment of the present invention.
Figure 11 is an enlarged view of part B of Figure 10.

Hereinafter, the present invention will be described in detail through examples. Prior to this, the terms or words used in this specification and claims should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately use the concept of terms to explain his or her invention in the best way. Based on the principle of definability, it must be interpreted with meaning and concept consistent with the technical idea of the present invention. Accordingly, the configuration of the embodiments described in this specification is only one of the most preferred embodiments of the present invention and does not represent the entire technical idea of the present invention, and various equivalents can be substituted for them at the time of filing of the present invention. It should be understood that there may be variations. Meanwhile, identical or similar reference numbers are assigned to identical or equivalent parts in the drawings, and throughout the specification, when a part is said to “include” a certain component, this means that, unless specifically stated to the contrary, the same or similar reference numbers are assigned to the same or similar parts. This does not mean that it is excluded, but that other components can be included.

Figures 2 and 3 show a perspective view and an exploded perspective view, respectively, of the battery transport tray 30 (hereinafter abbreviated as 'tray 30') according to an embodiment of the present invention. For convenience, in the explanation below, the inside of the tray 30 will be referred to as the 'inside' and the outside will be referred to as the 'outside'.

The tray 30 basically has a box-shaped outer frame 310; A mounting portion 320 that accommodates the battery 10 mounted thereon; and a plurality of fastening members 330 for coupling the mounting unit 320 to the bottom surface of the outer frame 310.

Figure 4 shows a top and bottom view of the outer frame 310 according to an embodiment of the present invention. The outer frame 310 is made of a hard plastic resin material to spatially partition the area where the battery 10 is accommodated in the mounting unit 320 from the outside, and allows the battery 10 to be extracted and mounted on the mounting unit 320. It has a structure in which the upper part is open so that it can be accommodated inside, while at least part of the side wall is open for assembly, disassembly, and standard adjustment of various parts and elements accommodated therein. With respect to the surface element of the outer frame 310, a plurality of ribs are formed at necessary locations to reinforce rigidity, while the surface element is thinned to reduce weight within the range where the rigidity of the surface element is not reduced.

The bottom of the outer frame 310 is provided with a plurality of long grooves 312 for slidingly fixing the component elements constituting the mounting unit 320. In the embodiment, 10 long grooves 312 are provided, and 5 are provided symmetrically on both sides with respect to the center of the bottom of the outer frame 310. Each long groove 312 is provided with an expansion portion 3122, and T-shaped protrusions 3249 and 3269 provided on some component elements constituting the mounting portion 320 can be inserted into the expansion portion 3122. It has a structure. When some component elements constituting the mounting unit 320 are assembled or separated from the outer frame 310, the T-shaped protrusions 3249 and 3269 are moved in and out of the long groove 312 through the expansion unit 3122.

The mounting unit 320 basically includes a pair of insert assemblies 321. A pair of insert assemblies 321 are symmetrically provided on both sides inside the outer frame 310, and are arranged to have a predetermined gap between them, and are inserted into the long groove 312 according to the change in the width of the battery 10. It is fixed in a sliding manner. Each insert assembly 321 has a plurality of slots 3224 in which the periphery of the electrode lead 13 and the pouch 12 are inserted and supported at both left and right ends of the battery 10, and the lower end of the cell 11 of the battery 10. A first seating portion 3242 on which the side is seated is provided.

5 to 7 are views related to an embodiment of a pair of insert assemblies 321, and FIG. 5 is a top view, front view, rear view, bottom view, and side view of the insert 322 according to an embodiment of the present invention. 6 is a top view, front view, rear view, bottom view, and bottom perspective view of the insert base 324 according to an embodiment of the present invention, and FIG. 7 is a diagram showing the assembly method between the insert 322 and the insert base 324. Each is indicated. Figure 8 shows an enlarged view of part A of Figure 6. FIG. 9 is a diagram showing the process of fastening the insert base 324 of FIG. 6 to the outer frame 310 of FIG. 4.

5 to 9, according to an embodiment of the present invention, each insert assembly 321 includes an insert 322 and an insert base 324. The insert 322 and the insert base 324 are assembled in a snap fit form using snap protrusions 3248 and snap grooves 3228 bent on the sides. The bottom surfaces of the insert 322 and the insert base 324 are aligned in the assembled state. The insert 322 and the insert base 324 are fixed to the long groove 312 by the fastening member 330 in the assembled state. Each part of the insert assembly 321 will be described in more detail.

Referring to Figure 5, the insert 322 is provided with a plurality of slots 3224. The insert 322 has a structure in which pins 3222 are formed side by side at regular intervals, and slots 3224 are provided between adjacent pins 3222. A plurality of fastening holes 3226 are formed on the outside of the insert 322 at a position where the fastening member 330 is coupled, and the fastening member 330 passes through the fastening hole 3226 and is coupled to the long groove 312 to form an insert ( 322) is coupled to the outer frame 310. In the embodiment, it is illustrated that five fastening holes 3226 are formed according to the number of long grooves 312. A snap groove 3228 is provided inside the insert 322 so that it can be coupled to the insert base 324 in a snap fit manner.

Referring to FIG. 6, the insert base 324 is provided with a first seating portion 3242. The first seating portion 3242 of the insert base 324 is partitioned by slits 3241 and 3261 at an interval equal to the arrangement interval of the pins 3222. A portion of the packaging portion at the bottom of the battery 10 is inserted and supported in the slits 3241 and 3261, and the slits 3241 and 3261 are aligned with the slot 3224 formed by the pin 3222.

Some of the first seating portions 3242 of the insert base 324 are provided with first fastening grooves 3246 corresponding to positions where the fastening member 330 is coupled. In this case, the first fastening groove 3246 is formed to a depth that allows the head of the fastening member 330 to be accommodated therein, and at the same time, the first fastening groove 3246 is formed so that the lower end of the cell 11 of the battery 10 can be supported. 1 It is characterized in that it is formed only in a partial area of the seating portion 3242.

That is, even though the first fastening groove 3246 is formed, the lower region of the cell 11 of the battery 10 is supported by the branch region 32422 of the first seating portion 3242 as shown in FIG. 8. By sufficiently securing the area without being damaged, the risk of the battery 10 accommodated inside being damaged by external shock, etc. during handling can be effectively prevented. In the embodiment, the first fastening grooves 3246 are illustrated as being formed at two left and right ends.

A T-shaped protrusion 3249 is provided on the lower surface of the insert base 324, and in the process of attaching and detaching the insert assembly 321 to the outer frame 310, the T-shaped protrusion 3249 is an extension provided in the long groove 312. It is brought in and out of the janghome 312 through the unit 3122. In the embodiment, three T-shaped protrusions 3249 are provided on the lower surface of the insert base 324.

A snap protrusion 3248 is provided on the outside of the insert base 324 so that it can be coupled to the insert 322 in a snap fit manner. The snap protrusion 3248 is engaged and coupled with the above-described synaptic groove in a snap fit manner.

Referring to FIG. 9, the first fastening groove 3246 selectively formed in the first seating portion 3242 may have a structure with an open side. As a component element constituting the fastening member 330 through the open side, the bolt 332 can be easily inserted in an inclined state, making assembly and detachment from the insert assembly 321 easy, thereby creating an overall battery 10 model. Workability during the change process is improved.

As shown in FIG. 3, the fastening member 330 consists of a bolt 332 and a nut 334 that are assembled in each direction from the top and bottom of the long groove 312. Bolts 332 are introduced from the top of the tray 30. The bolt 332 is introduced through the open side of the first fastening groove 3246, and a fastening tool (not shown) is inserted into the first fastening groove 3246 to perform the fastening process for the bolt 332. It will be performed. In the assembled state, the head of the bolt 332 is located inside the first fastening groove 3246, so that the lower end of the cell 11 of the battery 10 is in the branch areas 32422 and 32622 of the first seating portion 3242. ) does not interfere with or interfere with what is supported by The nut 334 is introduced from the bottom of the tray 30. To prevent idle rotation during the coupling process, the nut 334 preferably has a square shape. In the assembled state, the nut 334 is concealed at a position of about 0.1 mm inside the bottom surface of the outer frame 310, so that the bottom surface of the tray 30 is maintained in a generally flat state, so that it is accommodated in the tray 30 and its interior. The battery 10 receives minimal transport shock even when it is moved on a conveyor, etc. during the process.

The process of attaching and detaching the insert assembly 321 to the outer frame 310 will be described. The assembly process involves assembling a pair of inserts 322 and the insert base 324 using a snap fit method using a snap groove 3228 and a snap protrusion 3248 as shown in FIG. 7, and then assembling a pair of insert assemblies ( 321) While each is located at the inner edge of the outer frame 310, the T-shaped protrusions 3249 and 3269 of the insert base 324 are inserted into the extended portion 3122 of the long groove 312 and inserted into the long groove 312. Afterwards, the pair of insert assemblies 321 are slidably moved toward the center of the tray 30 so that the gap between the pair of insert assemblies 321 meets the specifications of the battery 10, and then the bolt 332, which is the fastening member 330, is attached. This is performed by introducing the and nuts 334 from the upper and lower portions of the tray 30 to the fastening positions, respectively, and combining them. Since the assembly of the bolt 332 by the operator is performed from above the tray 30, workability is good. In addition, the length according to the battery 10 standard may be displayed along the long groove 312, and the operator can refer to this to adjust the gap between the pair of insert assemblies 321. The disassembly operation of the insert assembly 321 is performed in the reverse order.

The mounting unit 320 may further include a center base 326 as an additional component element along with the insert assembly 321. Figure 10 shows a top view, front view, rear view, bottom view, and side view of the center base 326 according to an embodiment of the present invention, and Figure 11 shows an enlarged view of portion B of Figure 10.

The center base 326 is provided between the pair of insert assemblies 321, and in particular, both ends of the side and bottom of the battery 10 have slots 3224 provided in the insert assembly 321, the first Despite being supported by the seating portion 3242 and the slit 3241, in the case of the large-sized battery 10, the middle portion is provided for the purpose of preventing damage due to bending stress due to its own weight.

For this purpose, the center base 326 is provided with a second seating portion 3262 on which the middle of the lower end of the battery 10 cell 11 is seated, and like the insert base 324 described above, the second seating portion ( 3262) is divided by a slit 3261 at an interval equal to the arrangement interval of the pin 3222 of the insert 322, and a portion of the pouch 12 at the bottom of the battery 10 is inserted and supported in the slit 3261, and the slit 3261 is aligned with slot 3224 formed by pin 3222.

The method of fixing the center base 326 to the long groove 312 of the outer frame 310 is substantially the same as the method of fixing the insert base 324 to the long groove 312 described above. The lower surface of the center base 326 is provided with a T-shaped protrusion 3269 that is inserted into the expanded portion 3122 of the long groove 312. In the embodiment, it is illustrated that eight T-shaped protrusions 3269 are provided. In addition, a second fastening groove 3266 is provided at a position of the second seating portion 3262 where the fastening member 330 is coupled, and the second fastening groove 3266 is provided at a position where the head of the fastening member 330 is It is formed to a depth that can be accommodated inside, and is formed only in a partial area of the second seating portion 3262 so that the lower end of the cell 11 of the battery 10 can be supported.

That is, even though the second fastening groove 3266 is formed as shown in FIG. 11, the lower region of the cell 11 of the battery 10 is supported by the branch region 32622 of the second seating portion 3262. By sufficiently securing the area without being damaged, the risk of the battery 10 accommodated inside being damaged by external shock, etc. during handling can be effectively prevented. In the embodiment, a total of four second fastening grooves 3266 are formed, two on each of the left and right ends.

Optionally, the second fastening groove 3266 formed in the second seating portion 3262 may have an open side structure. As in the case of fastening the insert base 324 to the outer frame 310 according to FIG. 9, the parts constituting the fastening member 330 through the open side of the second fastening groove 3266 of the center base 326 As the bolt 332 is easily inserted as an element, assembly and detachment from the center base 326 are facilitated, thereby improving overall workability in the battery 10 model change process.

According to the battery transport tray 30 of the present invention, a special coupling structure between the outer frame 310 and the mounting unit 320, such as a fastening member 330, a long groove 312, a first fastening groove 3246, and a first fastening groove 3246, is provided. 2 Based on the shape of each fastening groove 3266 and the form of their connection to each other, workability in the battery 10 model change process can be significantly improved. In addition, the battery transport tray 30 has a seating portion that supports the lower end of the cell 11 of the battery 10 in the mounting portion 320, that is, a second seating portion 3262 of the center base 326 that is optionally provided. A first fastening groove 3246 and a second fastening groove 3266 are added or formed in each of the first seating portion 3242 of the insert base 324 and the second seating portion 3262 of the center base 326. Despite this, the area supporting the lower area of the cell 11 of the battery 10 is sufficiently secured without being damaged, thereby effectively preventing the risk of the battery 10 stored inside the tray 30 being damaged by external shock, etc. during the handling process. You can.

The above description relates to specific embodiments of the present invention. As described above, the above embodiments according to the present invention are disclosed for the purpose of explanation and are not to be understood as limiting the scope of the present invention, and those skilled in the art will not depart from the essence of the present invention. It should be understood that various changes and modifications are possible, and all such modifications and changes may be understood as falling within the scope of the invention disclosed in the patent claims or equivalents thereof.

10: Battery (pouch-type secondary battery)
11: cell
12: Pouch
13: Electrode lead
14: Tab weld area
30: Tray
310: outer frame
312: Janghome
3122: Extension part (T-shaped protrusion insertion part)
320: implementation unit
321: Insert assembly
322: insert
3222: pin
3224: slot
3226: fastener
3228: Snap Home
324: Insert base
3241: slit
3242: First seating portion
32422: Branch area
3246: First fastening groove
3248: Snap projection
3249: T-shaped protrusion
326: Center Base
3261: slit
3262: Second seating portion
32622: Branch area
3266: Second fastening groove
3269: T-shaped protrusion
330: fastening member
332: bolt
334: nut

Claims (10)

A box-shaped outer frame provided with a plurality of long grooves on the bottom surface; A mounting unit mounted on the outer frame via the long groove and having a plurality of slots into which both left and right ends of the battery are inserted and supported, and a first seating unit into which the lower end of the cell of the battery is seated; And a plurality of fastening members for coupling the mounting portion to the long groove,
The mounting unit is provided symmetrically on both sides within the outer frame, and includes a pair of insert assemblies that are arranged at a predetermined distance from each other and are slidably fixed to the long groove as the width of the battery changes. do,
The insert assembly includes an insert having the plurality of slots; And an insert base provided with the first seating portion,
A first fastening groove is provided at a position among the first mounting portions where the fastening member is coupled, and the first fastening groove is formed to a depth that allows the head of the fastening member to be accommodated therein, and at the same time, the cell of the battery A battery transport tray, characterized in that it is formed only in a partial area of the first seating portion so that the lower end can be supported.
delete The battery transport tray of claim 1, wherein the insert and the insert base are assembled in a snap fit form.
The battery transport tray according to claim 1, wherein a lower portion of the insert base is provided with a plurality of T-shaped protrusions for slidingly fixing the insert base when inserted into the long groove.
The method of claim 1, wherein the fastening member is made of a bolt and a nut assembled in the upper and lower directions of the long groove, and in the assembled state, the head of the bolt is located inside the first fastening groove and the nut is A battery transport tray, characterized in that it is located inside the bottom surface of the outer frame and is hidden.
The battery transport tray according to claim 1, wherein the first fastening groove has an open side structure.
The method of any one of claims 1, 3 to 6, wherein the mounting unit,
It further includes a center base provided between the pair of insert assemblies, fixed to the outer frame through a long groove, and provided with a second seating portion on which the middle bottom of the battery cell is seated,
A second fastening groove is provided at a position among the second seating portions where the fastening member is coupled, and the second fastening groove is formed to a depth that allows the head of the fastening member to be accommodated therein, and at the same time, the cell of the battery A battery transport tray, characterized in that it is formed only in a partial area of the second seating portion so that the lower end can be supported.
The battery transport tray according to claim 7, wherein a lower portion of the center base is provided with a plurality of T-shaped protrusions for slidingly fixing the center base when inserted into the long groove.
The method of claim 7, wherein the fastening member is made of a bolt and a nut assembled in the upper and lower directions of the long groove, and in the assembled state, the head of the bolt is located inside the second fastening groove and the nut is A battery transport tray, characterized in that it is located inside the bottom surface of the outer frame and is hidden.
The battery transport tray according to claim 7, wherein the second fastening groove has an open side structure.

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