Pole piece roll material boxing and packaging device

Abstract

The utility model provides a pole piece coil stock boxing and packing device which comprises a transport box, a winding shaft and a temporary storage frame, the temporary storage frame is arranged in the transport box, the temporary storage frame comprises a supporting lug and a limiting lug arranged above the supporting lug, the supporting lug and the limiting lug are matched to form a supporting limiting hole, and the supporting limiting hole is matched with the end of the winding shaft to support and limit the end of the winding shaft; the winding device further comprises a limiting baffle which is arranged on the outer side face of the supporting lug and / or the outer side face of the limiting lug and at least shields part of the supporting limiting hole so as to limit axial movement of the winding shaft. According to the technical scheme, the fixing firmness of the winding shaft and the temporary storage frame is guaranteed, so that the coated pole piece is fixed more firmly in the transportation box, and the transportation is safer.

Description

Technical Field

[0001] The present application generally relates to the field of electrode packaging, and specifically to a device for packing and packaging electrode coils. Background Art

[0002] Battery pole pieces generally refer to products with a battery pole layer plated on aluminum foil, which have a positive electrode and a negative electrode. As the core component of the battery, the quality and performance of the battery pole piece directly determines the quality and performance of the battery made from it. In order to ensure the excellent quality and performance of the battery pole piece, the stability and safety of the battery pole piece transportation are particularly important.

[0003] Battery electrodes are generally transported in the form of coils (i.e., battery electrodes are wound on a winding shaft). At present, the battery electrode transportation method before the improvement mainly adopts the transportation method supported by an iron frame. The battery electrodes in the form of coils are placed on the iron frame, and then the battery electrodes are transported by moving the packaging box. However, the packaging box will shake during transportation, and the battery electrodes in the form of coils in the box will also shake accordingly. When the battery electrodes in the form of coils shake, the winding shaft can easily detach from the support groove, causing the battery electrodes on the winding shaft to collide with the box body, and the battery electrodes are easily affected by moisture, resulting in damage to the battery electrodes.

[0004] Therefore, the inventors believe that the existing battery electrode transportation method has the problems of poor fixing stability and poor safety. Utility Model Content

[0005] In order to solve or at least partially solve the above defects, the present application provides a packing device for electrode coils, including: a transport box, a winding shaft, and a buffer rack, which is placed in the transport box, and the buffer rack includes a support ear and a limiting ear arranged above it, and the support ear and the limiting ear cooperate to form a support limiting hole, and the support limiting hole is adapted to the end of the winding shaft to support and limit it; it also includes a limiting baffle, which is arranged on the outer surface of the support ear and / or the limiting ear, and at least blocks part of the support limiting hole to limit the axial movement of the winding shaft. By having the above technical features, the two ends of the winding shaft are respectively supported and limited in the support limiting holes formed by the support ear and the limiting ear, so as to achieve the function of fixing the winding shaft, and the setting of the limiting baffle further limits the winding shaft, thereby ensuring the firmness of the winding shaft and the buffer rack, so that the coated electrode is fixed more firmly in the transport box and transported more safely.

[0006] In some embodiments, the top surface of the support ear is provided with a support groove matching the contour of the end of the winding shaft; the lower surface of the limiting ear is provided with a limiting groove matching the contour of the end of the winding shaft; the support groove and the limiting groove cooperate to form the support limiting hole. Thus, the support groove plays a role of supporting and fixing the winding shaft, while the limiting groove plays a role of reinforcing and limiting the winding shaft, thereby ensuring the stability of the fixing of the winding shaft and the buffer rack.

[0007] In some embodiments, the limit baffle is a lower baffle, and the lower baffle is integrally arranged with the support ear on the corresponding side; or, the limit baffle is an upper baffle, and the upper baffle is integrally arranged with the limit ear on the corresponding side; or, the limit baffle is composed of a lower baffle and an upper baffle, and the lower baffle is integrally arranged with the support ear on the corresponding side, and the upper baffle is integrally arranged with the limit ear on the corresponding side. Thus, the limit baffle is located at the end of the winding shaft, which limits the displacement of the winding shaft along its axial direction, and ensures the stability and safety of the winding shaft during transportation.

[0008] In some embodiments, the support ear and the limiting ear cooperate to form the support limiting hole that can be opened and closed. As an optional embodiment, the support ear and the limiting ear are hinged at the joint on one side, and the support ear and the limiting ear are connected to each other at the joint on the other side by a lock. Thus, the support ear and the limiting ear are hinged to each other and fixed by the lock, which greatly simplifies the efficiency of positioning and fixing the end of the winding shaft, and also greatly simplifies the maintenance efficiency.

[0009] In some embodiments, a fixing frame is provided between the support ear at one end of the winding shaft and the support ear at the other end to connect and fix the two. Thus, the two support ears are connected to each other by the fixing frame, thereby increasing the overall support strength of the buffer frame, ensuring the stability of the winding shaft support and the safety during transportation.

[0010] In some embodiments, the support ear includes a bracket and a support ear located on the top of the bracket, the support ear is detachably fixedly connected to the bracket, and the support groove is arranged on the top surface of the support ear. Thus, the support ear and the bracket are detachably fixedly connected, so that it is convenient to maintain and replace the worn or damaged support ear, which greatly improves the maintenance efficiency of the cache rack.

[0011] In some embodiments, the transport box includes a box body and a top cover disposed on the top of the box body, and the cache rack is disposed in the box body; the gaps among the box body, the winding shaft and the top cover are filled with a cushion pad. Therefore, the provision of the top cover, on the one hand, protects the top of the coated electrode, and also plays a role in shielding dust through the mutual covering of the top cover and the transport box, further protecting the transportation environment of the coated electrode; the cushion pad fills the gap between the coated electrode and the top cover, on the one hand, exerts a downward force on the limiting ear, so that the limiting ear and the support ear are fixed more firmly, improving the firmness of the winding shaft, and on the other hand, it fits more closely with the coated electrode, slowing down the vibration amplitude of the coated electrode, and also protecting the coated electrode.

[0012] In some embodiments, at least one layer of flexible protective film is provided in the transport box, the buffer rack is placed in the space enclosed by the flexible protective film, and / or the buffer pad includes a filling portion in the middle and extrusion portions at both ends of the filling portion, and the extrusion portion and the filling portion are both matched with the pores at the top of the electrode coil. Thus, the flexible protective film can, on the one hand, play a role in isolating and protecting the coated electrode, and on the other hand, can also play a role in waterproofing and moisture-proofing.

[0013] In some embodiments, the flexible protective film is provided with two layers, wherein one layer is an aluminum-plastic bag and the other layer is a plastic bag, wherein the plastic bag is provided in the aluminum-plastic bag, and the buffer rack is placed in the plastic bag. Thus, the aluminum-plastic bag has the function of being waterproof and moisture-proof, thereby protecting the environment around the coated electrode; and the plastic bag wraps the coated electrode, thereby protecting the electrode from being polluted and damaged.

[0014] In some embodiments, when the pole piece coil is arranged on the winding shaft, the pole piece coil of the winding shaft is wrapped with a shock-absorbing layer, thereby avoiding direct contact between the coated pole piece and the external environment, thereby protecting the coated pole piece. For the extrusion and collision of the external environment, the shock-absorbing layer also provides a buffer medium, which reduces the impact force of the coated pole piece in contact with the external environment.

[0015] It should be understood that the contents described in the content section of this application are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall outline schematic diagram of a pole piece coil packing and packaging device provided in an embodiment of the present application is shown;

[0017] Figure 2A schematic diagram of the structure of a winding shaft in a pole piece coil packing and packaging device provided in an embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram of the structure of a buffer rack in a pole piece coil packing and packaging device provided in an embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram of the structure of a support ear and a limit ear in a pole piece coil packing and packaging device provided in an embodiment of the present application is shown;

[0020] Figure 5 An exploded schematic diagram of a packing and packaging device in a pole piece coil packing and packaging device provided in an embodiment of the present application is shown;

[0021] Figure 6 A schematic diagram of the structure of a buffer pad in a pole piece coil packing and packaging device provided in an embodiment of the present application is shown.

[0022] Explanation of symbols

[0023] 1. Transport box; 11. Top cover; 21. Aluminum-plastic bag; 22. Plastic bag; 3. Cache rack; 31. Support ear; 311. Bracket; 312. Support ear; 3121. Support groove; 32. Fixing rack; 33. Limiting ear; 331. Limiting groove; 34. Lower baffle; 35. Upper baffle; 36. Hinge; 37. Lock; 4. Winding shaft; 5. Shock-absorbing layer; 6. Buffer pad; 61. Filling part; 62. Extrusion part; 7. Desiccant. DETAILED DESCRIPTION

[0024] Below, the preferred embodiments (or implementation methods) of the present application are described in detail with reference to the accompanying drawings.

[0025] The present application provides a packing device for electrode coils, comprising: a transport box 1, a winding shaft 4, and a buffer rack 3, which is placed in the transport box 1, the buffer rack 3 comprising a support ear 31 and a limiting ear 33 arranged above the buffer rack 3, the support ear 31 and the limiting ear 33 cooperate to form a support limiting hole, the support limiting hole is adapted to the end of the winding shaft 4 to support and limit it; and further comprising a limiting baffle, which is arranged on the outer surface of the support ear 31 and / or the limiting ear 33, and at least blocks part of the support limiting hole to limit the axial movement of the winding shaft 4. By having the above technical features, the two ends of the winding shaft 4 are respectively supported and limited in the support limiting hole formed by the support ear 31 and the limiting ear 33, so as to achieve the function of fixing the winding shaft 4, and the setting of the limiting baffle further limits the winding shaft 4, thereby ensuring the firmness of the fixing of the winding shaft 4 and the buffer rack 3, so that the coated electrode is fixed more firmly in the transport box 1 and the transportation is safer.

[0026] As a most preferred embodiment, the present application provides a packing device for electrode coils, which includes a transport box 1, an aluminum-plastic bag 21 and a plastic bag 22 sequentially laid in the transport box 1, a buffer rack 3 fixed in the plastic bag 22, and a desiccant 7 placed in the plastic bag 22, a winding shaft 4 fixed on the buffer rack 3, a shock-absorbing layer 5 covering the electrode on the winding shaft 4, a buffer pad 6 laid on the winding shaft 4, and finally a top cover 11 covered on the buffer pad 6. The above structures together construct a packing device for the electrode, thereby ensuring the stability and safety of the electrode during transportation in the best way.

[0027] It should be noted that the "pole sheet coil" here generally refers to the coated pole sheet coil, but the uncoated pole sheet coil can also use the above-mentioned box packaging device to protect the stability and safety of the pole sheet coil during transportation.

[0028] Reference below Figure 1-Figure 6 To describe a pole piece coil packing and packaging device provided in an embodiment of the present application.

[0029] Figure 1 The overall outline schematic diagram of a pole piece coil packing and packaging device provided in an embodiment of the present application is shown. Figure 1 As shown, a pole piece coil packing and packaging device provided in this embodiment includes a transport box 1 and a top cover 11 covered on the top of the transport box 1. The pole piece coil is fixed in the transport box 1. Through the covering of the transport box 1 and the top cover 11, the pole piece coil is isolated from the external environment and plays a preliminary protection role.

[0030] Figure 2 FIG. 4 is a schematic diagram showing the structure of a winding shaft 4 in a pole piece coil packing and packaging device provided in an embodiment of the present application. Figure 2 The figure shows the state of the winding shaft 4 after winding the pole piece and forming the pole piece coil on its surface. Figure 2 As shown, the coated electrode is rolled up on the winding shaft 4 to form an electrode roll. In some embodiments, the cross-section of the winding shaft 4 can be a circle, a regular shape with 3 or more sides, or an irregular shape with 3 or more sides. The structure of the winding shaft 4 will not affect the support and transportation of the electrode. However, in order to ensure the uniformity of the winding shaft 4 on the electrode winding, the cross-section of the winding shaft 4 is preferably a circular cross-section, so that after the electrode is wound on the winding shaft 4, its bending is more natural and the force is more uniform, which further improves the stability of the coated electrode during transportation.

[0031] Figure 3 The schematic diagram of the structure of the buffer rack 3 in the electrode coil packing and packaging device provided in the embodiment of the present application is shown. Figure 3As shown, the cache rack 3 includes a support ear 31 and a limiting ear 33 arranged thereon, and the support ear 31 cooperates with the limiting ear 33 to form an openable and closable support limiting hole, so as to accommodate the end of the winding shaft 4 and support and fix it. A fixing frame 32 is also arranged between the two support ears 31, and the fixing frame 32 is respectively fixed to the support ears 31 on both sides, so that the cache rack 3 as a whole can be stably supported on a plane. The support ear 31 includes a bracket 311 connected to the bottom fixing frame 32, and a support ear 312 detachably fixedly connected to the upper part of the bracket 311. Specifically, the support ear 312 can be fixed to the bracket 311 by means of bolts. On the one hand, after the support ear 312 is worn or damaged, the economic cost of replacing the cache rack 3 as a whole is reduced. On the other hand, the maintenance efficiency is greatly improved and the replacement time is reduced.

[0032] Figure 4 The schematic diagram of the structure of the ear 312 and the limiting ear 33 in a pole piece coil packing and packaging device provided by an embodiment of the present application is shown. The upper surface of the ear 312 is provided with a support groove 3121 that matches the end of the winding shaft 4, so that when the winding shaft 4 and the buffer rack 3 are fixed to each other, the two ends of the winding shaft 4 are embedded in the support grooves 3121 of the ear 312 on both sides, thereby realizing the support function of the buffer rack 3 on the winding shaft 4. And each limiting ear 33 is provided with a limiting groove 331 that matches the contour of the end of the winding shaft 4 on the lower surface, so that after the limiting ear 33 and the ear 312 are fixed to each other, the end of the winding shaft 4 is simultaneously located in the support groove 3121 of the ear 312 and the limiting groove 331 of the limiting ear 33, thereby realizing the function of the buffer rack 3 to position the winding shaft 4. The support groove 3121 and the limiting groove 331 cooperate to form the support limiting hole.

[0033] A limiting baffle is provided on the outer side of the support ear 31 and / or the limiting ear 33, and at least partially blocks the support limiting hole to limit the axial movement of the winding shaft 4. In some embodiments, the limiting baffle may be an upper baffle 35, which is integrally provided with the limiting ear 33 on the corresponding side; in some embodiments, the limiting baffle may be a lower baffle 34, which is integrally provided with the support ear 312 on the corresponding side; in some embodiments, the limiting baffle may be composed of a lower baffle 34 and an upper baffle 35, which is integrally provided with the support ear 312 on the corresponding side, and the upper baffle 35 is integrally provided with the limiting ear 33 on the corresponding side.

[0034] The supporting ear 31 and the limiting ear 33 are hinged at the joint on one side, and the supporting ear 31 and the limiting ear 33 are connected to each other at the joint on the other side through a lock 37. The supporting ear 312 and the limiting ear 33 can be fixed in a variety of ways, such as fixing the joint between the supporting ear 312 and the limiting ear 33 by bolts, fixing the supporting ear 312 and the limiting ear 33 by clamps, etc. Specifically, in some embodiments, the hinge 36 and the lock 37 can also be used, the hinge 36 is located at the joint on one side of the supporting ear 312 and the limiting ear 33, the two opening and closing parts of the hinge 36 are respectively connected to the supporting ear 312 and the limiting ear 33, and the other side of the supporting ear 312 and the limiting ear 33 are respectively connected to the opening and closing part and the fixing part of the lock 37. Under the connection of the hinge 36, the limiting ear 33 is located on one side of the support ear 312 in an open state. When the end of the winding shaft 4 is placed in the supporting groove 3121 of the support ear 312, the limiting ear 33 is closed, and finally the support ear 312 and the limiting ear 33 are locked by the lock 37. In this process, the fixing operation of the winding shaft 4 is greatly simplified, and the fixing efficiency of the winding shaft 4 is greatly improved. In addition, the connection structure is simple through the hinge 36 and the lock 37, which is also conducive to subsequent maintenance and replacement.

[0035] Since the weight of the coated electrode carried by the winding shaft 4 is approximately 200-400kg, the support ear 312 and the limit ear 33 are in contact for a long time during transportation, which can easily cause wear to the support groove 3121 of the support ear 312 and the limit groove 331 of the limit ear 33. If the subsequent wear gap increases, it can easily cause the winding shaft 4 to shake during transportation, thereby causing safety hazards. Therefore, in some embodiments, the support member of the support ear 312 and the lower baffle 34 or the limit member of the limit ear 33 and the upper baffle 35 can be replaced with a support block made of ABS material. ABS has high impact strength and heat resistance, thereby greatly extending the service life of the support ear 312 and the limit ear 33.

[0036] Figure 5 FIG. 1 shows an exploded schematic diagram of a packing and packaging device for a pole piece coil in an embodiment of the present application, with reference to FIG. Figure 5As shown, at least one layer of flexible protective film is provided in the transport box, and the buffer rack 3 is placed in the space enclosed by the flexible protective film. In some embodiments, the flexible protective film may be an aluminum-plastic bag 21, which has the function of being waterproof and moisture-proof, thereby isolating the contact between the coated electrode and the external environment. In some embodiments, the flexible protective film may be a plastic bag 22, which isolates the external environment from the environment in which the coated electrode is located, so that the coil will not be contaminated or damaged. In some embodiments, the flexible protective film may be a combination of an aluminum-plastic bag 21 and a plastic bag 22, wherein the plastic bag 22 is provided in the aluminum-plastic bag 21, and the buffer rack 3 is placed in the plastic bag 22, so that it has the advantages of both the aluminum-plastic bag 21 and the plastic bag 22. A desiccant 7 is also placed in the plastic bag 22, so that after the plastic bag 22 and the aluminum-plastic bag 21 are sealed, the desiccant 7 can improve the humidity environment around the coil to prevent the quality of the coil from being affected.

[0037] The coil coated with the pole piece is also coated with a shock absorbing layer 5, which can be a flexible and elastic material. Wrapping it around the coil can not only play a role of covering and protecting, but also reduce the impact on the coil side, further improving the protection effect of the coil. Specifically, the shock absorbing layer 5 can be a cushion body made of foam material, which is light and highly elastic, avoiding direct contact between the coil and the external environment, and playing a good protective role for the coil.

[0038] When assembling the box packing device, firstly, an aluminum-plastic bag 21 is laid on the bottom of the transport box 1, and then a plastic bag 22 is laid, and the aluminum-plastic bag 21 and the plastic bag 22 are kept open, then the buffer rack 3 is placed into the plastic bag 22, and the buffer rack 3 is positioned and fixed, and then the winding shaft 4 is hoisted into the transport box 1, so that the two ends of the winding shaft 4 are located in the supporting grooves 3121 of the support ears 312, and then the limiting ears 33 are fixed by the lock buckle 37. Before the top cover 11 is covered, since there is still a gap between the limiting ears 33, the top cover 11 and the transport box 1, a buffer pad 6 is also provided in the transport box 1, refer to Figure 6 As shown, Figure 6The schematic diagram of the structure of the buffer pad 6 in a pole piece coil packing and packaging device provided by an embodiment of the present application is shown. The buffer pad 6 includes a filling portion 61 in the middle and extrusion portions 62 located at both ends of the filling portion 61, and the extrusion portion 62 and the filling portion 61 cooperate with the pores at the top of the coil, so that after the buffer pad 6 is placed in the gap of the transport box 1, the buffer pad 6 can be perfectly filled in the excess gap, on the one hand, ensuring the stability of the coil during transportation, and on the other hand, the extrusion portion 62 squeezes the limit ear 33, which also ensures the reliability of the fixation of the limit ear 33 and the support ear 312, and further ensures the stability of the winding shaft 4. Finally, the top cover 11 is placed on the top of the transport box 1 to achieve the packaging of the transport box 1. Specifically, the buffer pad 6 can be preferably a foam pad, which has excellent buffering performance, light weight, and can play a supporting and filling role.

[0039] After the cushion pad 6 is laid, the plastic bag 22 needs to be sealed. Specifically, the short side of the opening of the plastic bag 22 is folded in half, and then the long side of the plastic bag 22 is folded in half, and a wide tape is used to seal along the gap after the folding, so that the tape is in close contact with the plastic bag 22. Then, the aluminum-plastic bag 21 is sealed using an aluminum-plastic bag 21 sealing machine.

[0040] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pole piece coil packing and packaging device, characterized in that: include: Transport box (1), Winding shaft (4), A buffer rack (3) is placed in the transport box (1), the buffer rack (3) comprises a supporting ear (31) and a limiting ear (33) arranged above the supporting ear (31), the supporting ear (31) and the limiting ear (33) cooperate to form a supporting limiting hole, the supporting limiting hole is adapted to the end of the winding shaft (4) to support and limit the winding shaft; Also includes, The limiting baffle is arranged on the outer side surface of the supporting ear (31) and / or the limiting ear (33), and at least partially blocks the supporting limiting hole to limit the axial movement of the winding shaft (4).

2. The electrode coil packing and packaging device according to claim 1 is characterized in that: The top surface of the support ear (31) is provided with a support groove (3121) that matches the contour of the end of the winding shaft (4); The lower surface of the limiting ear (33) is provided with a limiting groove (331) matching the contour of the end of the winding shaft (4); The supporting groove (3121) cooperates with the limiting groove (331) to form the supporting limiting hole.

3. The electrode coil packing and packaging device according to claim 1 is characterized in that: The limit baffle is a lower baffle (34), and the lower baffle (34) is integrally arranged with the supporting ear (31) on the corresponding side; or, The limiting baffle is an upper baffle (35), and the upper baffle (35) is integrally arranged with the limiting ear (33) on the corresponding side; or, The limit baffle plate is composed of a lower baffle plate (34) and an upper baffle plate (35); the lower baffle plate (34) is integrally arranged with the support ear (31) on the corresponding side; and the upper baffle plate (35) is integrally arranged with the limit ear (33) on the corresponding side.

4. The electrode coil packing and packaging device according to claim 1, characterized in that: The supporting ear (31) and the limiting ear (33) cooperate to form the supporting limiting hole which can be opened and closed.

5. The electrode coil packing and packaging device according to claim 4 is characterized in that: The supporting ear (31) and the limiting ear (33) are hinged to each other at their abutting positions on one side, and the supporting ear (31) and the limiting ear (33) are connected to each other at their abutting positions on the other side via a lock buckle (37); and / or, A fixing frame (32) is provided between the supporting ear (31) at one end of the winding shaft (4) and the supporting ear (31) at the other end to connect and fix the two.

6. The electrode coil packing and packaging device according to claim 2, characterized in that: The supporting ear (31) comprises a bracket (311) and a supporting ear (312) located at the top of the bracket (311); the supporting ear (312) is detachably fixedly connected to the bracket (311); and the supporting groove (3121) is arranged on the top surface of the supporting ear (312).

7. The electrode coil packing and packaging device according to claim 1, characterized in that: The transport box (1) comprises a box body and a top cover (11) arranged on the top of the box body, and the cache rack (3) is arranged in the box body; The gaps between the box body, the winding shaft (4) and the top cover (11) are filled with a buffer pad (6).

8. The electrode coil packing and packaging device according to claim 7, characterized in that: At least one layer of flexible protective film is provided in the transport box (1), and the cache rack (3) is placed in a space enclosed by the flexible protective film; and / or, The buffer pad (6) comprises a filling portion (61) in the middle and extrusion portions (62) located at both ends of the filling portion (61), and the extrusion portion (62) and the filling portion (61) both cooperate with the pores at the top of the pole piece coil.

9. The electrode coil packing and packaging device according to claim 8, characterized in that: The flexible protective film is provided with two layers, wherein one layer is an aluminum-plastic bag (21) and the other layer is a plastic bag (22), the plastic bag (22) is arranged in the aluminum-plastic bag (21), and the cache rack (3) is placed in the plastic bag (22).

10. The electrode coil packing and packaging device according to claim 3, characterized in that: When the pole piece coil is arranged on the winding shaft (4), the pole piece coil of the winding shaft (4) is wrapped with a shock absorbing layer (5).

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