Lightweight battery bracket

Abstract

The invention belongs to the field of new energy vehicles, and provides a lightweight battery bracket, which comprises a tray, a top cover, a spacing assembly and a connecting beam, the tray comprises an aluminum cladding, the bottom of the aluminum cladding is provided with a metal reinforcing plate distributed along the periphery of the aluminum cladding, the inner side of the metal reinforcing plate is provided with a non-metal liquid cooling groove, and the bottom of the non-metal liquid cooling groove is provided with a supporting plate. The two sides of the supporting plate are connected with the side faces of the tray, the top cover comprises a left cover plate, a middle cover plate, a right cover plate and a non-metal cover plate connected through a dovetail structure, and the non-metal cover plate and the non-metal liquid cooling groove are both made of ultra-high molecular weight polyethylene materials. By adopting the design of the single-layer aluminum cladding and the non-metal liquid cooling groove, the light weight effect can be achieved on the basis of realizing liquid cooling; and the top cover adopts the non-metal cover plate as a transition part among the left cover plate, the middle cover plate and the right cover plate, so that the flow of circulating water in the battery interval position is reduced, and the light weight is further realized on the basis of improving the cooling efficiency of the circulating water.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicles, and in particular relates to a lightweight battery bracket. Background Technology

[0002] The core function of battery trays for new energy vehicles is to fix, position, and protect the batteries, and to assist in stable battery operation, such as providing liquid cooling. Improvements to battery trays mainly revolve around five core objectives: lightweighting, multi-functional integration, adaptability, safety, and intelligence, while also considering the differentiated needs of various application scenarios such as automobiles, energy storage, and electrical equipment.

[0003] Most battery trays are made of welded stainless steel profiles. In terms of lightweighting, aluminum plates are often used to replace the original stainless steel materials, and the tray and the pallet are integrated. Although this achieves a lightweight effect, the pallet area still uses a metal sandwich design due to the need for liquid cooling. To meet the market's lightweight requirements, there is still room for improvement in integrated pallet trays. Furthermore, the top cover of the integrated pallet tray is a one-piece sealed structure. Although using a liquid cooling sandwich can obtain a larger water flow area, the cooling efficiency of circulating water near the battery compartment is not as high as that near the center of the battery. Therefore, the circulating water utilization rate and the lightweight effect need to be improved. Summary of the Invention

[0004] This invention addresses the technical problems of the aforementioned integrated battery tray by proposing a lightweight battery tray that is rationally designed, lightweight, and beneficial to improving the utilization rate of circulating water.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The present invention provides a lightweight battery holder, including a tray and a top cover. The tray has an internal spacer assembly and connecting beams around its perimeter. The tray includes an aluminum cladding layer, and a metal reinforcing plate distributed around the bottom of the aluminum cladding layer. A non-metallic liquid cooling tank is provided on the inner side of the metal reinforcing plate, and a support plate is provided at the bottom of the non-metallic liquid cooling tank. The two sides of the support plate are connected to the sides of the tray. The top cover includes a left cover plate, a middle cover plate, and a right cover plate arranged sequentially and bolted to the tray. The sides of the left cover plate, the middle cover plate, and the right cover plate are each provided with an upper pipe opening. A self-closing groove is provided between the middle cover plate and the left and right cover plates. A dovetail structure is provided in the middle of the self-closing groove. A non-metallic cover plate that cooperates with the dovetail structure is provided in the self-closing groove. The two sides of the non-metallic cover plate are tightly fitted to the groove wall of the self-closing groove. Both the non-metallic cover plate and the non-metallic liquid cooling tank are made of ultra-high molecular weight polyethylene material.

[0006] Preferably, the side of the metal reinforcing plate is provided with a lower pipe opening, and the side of the non-metallic liquid cooling tank is provided with a corresponding interface to the lower pipe opening.

[0007] Preferably, the aluminum cladding has an upper and lower plate on its side, and two sets of side cooling grooves symmetrically distributed between the upper and lower plates are provided on both sides of the aluminum cladding. The side cooling grooves are made of ultra-high molecular weight polyethylene material, and the side of the side cooling grooves has a central opening.

[0008] Preferably, the side cooling groove assembly includes two L-shaped side cooling grooves, the L-shaped openings of which fit with the right-angled edges of the aluminum cladding, and the opposite surfaces of the two side cooling grooves are provided with external insertion tubes and internal slots.

[0009] Preferably, the side of the metal reinforcing plate is provided with a plurality of waist-shaped openings, and the side of the non-metallic liquid cooling tank is provided with waist-shaped grooves corresponding to the waist-shaped openings, and waist-shaped connecting blocks are provided in the waist-shaped openings and waist-shaped grooves.

[0010] Preferably, the pallet includes a base plate, and two side plates extending toward the aluminum cladding are provided at both ends of the base plate. A fork is provided between the side plates, and the waist-shaped connecting block is provided on the inner side of the side plate.

[0011] Preferably, the pallet is provided with a reinforcing edge that is continuously distributed around the edges of the bottom plate and side plate, as well as the edge of the fork.

[0012] Preferably, the spacer assembly includes two vertical plates and one horizontal plate arranged in a crisscross pattern. The bottom of both the vertical and horizontal plates is provided with a connection hole, and a positioning component that connects to the inner bottom of the tray is provided in the connection hole.

[0013] Preferably, the positioning component includes a positioning internal stud, in which an internal hexagon bolt is threadedly connected, the connecting hole is a tapered hole, a positioning post is provided at the top of the tapered hole, and a spring is provided on the outside of the positioning post to engage with the top surface of the internal hexagon bolt.

[0014] Preferably, both the vertical and horizontal plates are made of ultra-high molecular weight polyethylene.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention provides a lightweight battery holder that achieves both liquid cooling and weight reduction through a single-layer aluminum cladding and a non-metallic liquid cooling tank design. The top cover uses a non-metallic plate as a transition between the left, middle, and right covers, reducing the flow rate of circulating water at the battery spacing points. This further improves the cooling efficiency of the circulating water and contributes to weight reduction. This invention is rationally designed, achieves good weight reduction, and improves the utilization rate of circulating water, making it suitable for large-scale promotion. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A perspective view of a lightweight battery holder provided for an embodiment; Figure 2 A perspective view of a lightweight battery holder provided in an embodiment, viewed from another direction; Figure 3 A schematic diagram of the bottom structure of a lightweight battery holder provided for an embodiment; Figure 4 A perspective view of a lightweight battery holder (without a top cover) provided for an embodiment; Figure 5 An exploded view of a lightweight battery holder (without a top cover) provided for an embodiment; Figure 6 A side view of a lightweight battery holder provided for an embodiment; Figure 7 for Figure 6 A cross-sectional view of a lightweight battery holder along the HH direction; Figure 8 for Figure 7 An enlarged schematic diagram of a lightweight battery holder at point A; In the above figures: 1. Tray; 11. Aluminum cladding; 12. Metal reinforcing plate; 13. Lower pipe opening; 14. Upper upper plate; 15. Lower upper plate; 16. Waist-shaped opening; 2. Top cover; 21. Left cover plate; 22. Middle cover plate; 23. Right cover plate; 24. Upper pipe opening; 25. Self-closing groove; 26. Dovetail structure; 27. Non-metallic cover plate; 3. Spacer assembly; 31. Vertical plate; 32. Horizontal plate; 33. Connecting hole ; 4. Connecting beam; 5. Non-metallic liquid cooling tank; 51. Butt joint; 52. Waist-shaped groove; 6. Support plate; 61. Waist-shaped connecting block; 62. Base plate; 63. Side plate; 64. Fork opening; 65. Reinforcing edge; 7. Side cooling tank assembly; 71. Side cooling tank; 72. External insertion tube; 73. Internal slot; 74. Intermediate tube opening; 8. Positioning assembly; 81. Positioning internal stud; 82. Socket head cap screw; 83. Spring. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Examples, such as Figures 1-8As shown, the lightweight battery tray provided by the present invention is an integrated battery tray, specifically including a tray 1 and a top cover 2. The tray 1 has a spacer component 3 inside, and connecting beams 4 are provided around the tray 1. The tray 1 is installed on the chassis system of the new energy vehicle through the connecting beams 4 and bolts; the spacer component 3 is used to separate the batteries; the tray 1 and the top cover 2 form the battery pack shell, and the joint between the two is fixed with bolts. Based on this, the tray 1 provided by the present invention includes an aluminum cladding layer 11, a metal reinforcing plate 12 distributed around the bottom of the aluminum cladding layer 11, a non-metallic liquid cooling tank 5 inside the metal reinforcing plate 12, a support plate 6 at the bottom of the non-metallic liquid cooling tank 5, and the two sides of the support plate 6 connected to the sides of the tray 1. The top cover 2 includes a left cover plate 21, a middle cover plate 22, and a right cover plate 23 arranged sequentially and bolted to the tray 1. The sides of the left cover plate 21, the middle cover plate 22, and the right cover plate 23 are all provided with upper pipe openings 24. A self-closing groove 25 is provided between the middle cover plate 22 and the left cover plate 21 and the right cover plate 23. The self-closing groove 25 is a sunken design, and its bottom is lower than the periphery of the top cover 2. Its front and rear ends and left and right sides can provide four positioning edges for the non-metallic cover plate 27. A dovetail structure 26 is provided in the middle of the self-closing groove 25. The dovetail structure 26 consists of two halves, one half located on the left half of the self-closing groove 25 and the other half located on the right half of the self-closing groove 25. After the self-closing groove 25 is connected, the dovetail structure 26 automatically combines into a complete dovetail structure 26. A non-metallic cover plate 27 is provided in the self-closing groove 25 to cooperate with the dovetail structure 26. A dovetail groove is provided at the bottom of the non-metallic cover plate 27, which cooperates with the dovetail structure 26. The two sides of the non-metallic cover plate 27 are in close contact with the groove wall of the self-closing groove 25, thereby improving the sealing performance of adjacent cover plates at the position covered by the non-metallic cover plate 27. The top surface of the non-metallic cover plate 27 is on the same plane as the top surfaces of other cover plates. Both the non-metallic cover plate 27 and the non-metallic liquid cooling tank 5 are made of ultra-high molecular weight polyethylene material.

[0021] Specifically, the aluminum cladding 11 serves as the lower half of the battery pack casing, supporting the 2×3 arranged batteries and corresponding wiring structure. The metal reinforcing plate 12 at the bottom of the aluminum cladding 11 provides structural reinforcement, improving the deformation and compressive strength of the edges and providing a relatively sealed enclosure for the non-metallic liquid cooling tank 5. The non-metallic liquid cooling tank 5 faces upward, and a sealing gasket and sealant are placed between it and the surface of the metal reinforcing plate 12 to create a sealed liquid cooling space. The non-metallic liquid cooling tank 5 is made of ultra-high molecular weight polyethylene, which has excellent impact resistance. It is one of the engineering plastics with the best known toughness. Its core performance advantages are lightweight, ultra-high impact toughness, and good fatigue impact resistance, thereby ensuring the reliability and safety of the non-metallic liquid cooling tank 5 when installed on the chassis system. The non-metallic liquid cooling tank 5 can provide effective sealing conditions for the circulating water inside, allowing the circulating water to fully contact the aluminum cladding 11 to achieve heat conduction. The circulating water is connected to the water pipe of the thermal management system through the lower pipe port 13, thereby obtaining the corresponding circulation flow performance. The depth of the non-metallic liquid cooling tank 5 can be selected according to actual needs, achieving lightweight while ensuring liquid cooling requirements.

[0022] Furthermore, the top cover 2 serves to seal and cool the battery pack. The top cover 2 uses a non-metallic cover plate 27 as a transition between the left cover plate 21, the middle cover plate 22, and the right cover plate 23. After the left cover plate 21, the middle cover plate 22, and the right cover plate 23 are connected to the aluminum cladding 11 by bolts, the non-metallic cover plate 27 is automatically positioned by the cooperation of the dovetail structure 26 and the self-closing groove 25, thus forming the upper part of the device. The non-metallic cover plate 27 is made of ultra-high molecular weight polyethylene material, which can further achieve weight reduction. Water does not flow inside the non-metallic cover plate 27. The water flow inside the left cover plate 21, the middle cover plate 22, and the right cover plate 23 is independent and connected to the water pipe of the thermal management system through nylon tubes. This can reduce the flow rate of circulating water at the battery interval position, allowing the circulating water to fully contact the heat conduction concentration position and improve the cooling efficiency of the circulating water.

[0023] To facilitate the connection between the non-metallic liquid cooling tank 5 and the thermal management system, the side of the metal reinforcing plate 12 provided by the present invention is provided with a lower pipe port 13, and the side of the non-metallic liquid cooling tank 5 is provided with a corresponding interface 51. A sealing joint is spirally connected between the lower pipe port 13 and the interface 51, and the sealing joint is then connected to the water pipe of the thermal management system through a nylon pipe. This allows the lower part of the device to have an effective water flow path to ensure the liquid cooling performance of the device.

[0024] To improve the liquid cooling performance of this device, the aluminum cladding 11 provided in this invention has an upper circumferential plate 14 and a lower circumferential plate 15 on its sides. Two sets of side cooling channels 7 are symmetrically distributed between the upper circumferential plate 14 and the lower circumferential plate 15 on both sides of the aluminum cladding 11. The side cooling channels 7 are made of ultra-high molecular weight polyethylene material, and a central pipe opening 74 is provided on the side of the side cooling channels 7. The upper circumferential plate 14 has several threaded holes for connecting to the top cover 2, providing a sufficient number of connection nodes for the connection between the tray 1 and the top cover 2. Simultaneously, the upper circumferential plate 14 and the lower circumferential plate 15 serve to strengthen the structure and provide effective concealed installation conditions for the side cooling channels 7. The central pipe opening 74 inside the side cooling channels 7 is used for water inlet and outlet. By setting the side cooling channels 7 on the outside of the aluminum cladding 11, the structural strength of the side of the device can be improved, and a cooling effect can be achieved. Furthermore, the lightweight design does not excessively increase the weight of the side cooling channels 7.

[0025] Furthermore, the side cooling tank assembly 7 provided by the present invention includes two L-shaped side cooling tanks 71. The L-shaped openings of the side cooling tanks 71 are fitted with the right-angled edges of the aluminum cladding 11. The opposite surfaces of the two side cooling tanks 71 are provided with external insertion tubes 72 and internal slots 73. The tight fit between the external insertion tubes 72 and the internal slots 73 can improve the seamless effect of the two side cooling tanks 71 at the docking position, which is beneficial to improving the assembly reliability of the side cooling tank assembly 7. The openings of the side cooling tanks face the aluminum cladding 11 to ensure that the water fully contacts the aluminum cladding 11 to achieve heat exchange and heat dissipation. Sealing gaskets are provided on the sides of the side cooling tanks 71, and high-strength adhesive resistant to high and low temperatures is applied to the contact positions between the side cooling tanks 71 and the upper and lower plates 14 and 15 to ensure the sealing of the water flow inside the side cooling tanks 71. The two side cooling tanks 71 in the same group can be independently connected or connected. This invention prefers to use independent water flow, so that if the sealing condition of one side cooling tank 71 is damaged, it will not directly affect the other side cooling tank 71.

[0026] To improve the connection reliability between the non-metallic liquid cooling tank 5 and the metal reinforcing plate 12, the metal reinforcing plate 12 provided by this invention has multiple waist-shaped openings 16 on its side, and the non-metallic liquid cooling tank 5 has waist-shaped grooves 52 corresponding to the waist-shaped openings 16 on its side. Waist-shaped connecting blocks 61 are provided in the waist-shaped openings 16 and waist-shaped grooves 52. The waist-shaped openings 16 and waist-shaped grooves 52 combine to form a connecting groove with a certain depth. Multiple pairs of waist-shaped connecting blocks 61 are tightly fitted into the connecting grooves, forming reliable support nodes on the side of the non-metallic liquid cooling tank 5. This avoids the need for bolt connections and ensures the assembly quality of the non-metallic liquid cooling tank 5 and the metal reinforcing plate 12. Applying adhesive to the circumferential seam of the non-metallic liquid cooling tank 5 and the metal reinforcing plate 12 ensures the sealing of the non-metallic liquid cooling tank 5. Furthermore, the mating surfaces of the non-metallic liquid cooling tank 5 and the metal reinforcing plate 12 are treated with high-precision smoothing to ensure sealing under mechanical contact. Appropriate oiling is also applied to increase the self-priming pressure of the contact surface, further ensuring the sealing quality.

[0027] To improve the reliability of the lower part of this device, the pallet 6 provided by this invention includes a base plate 62. Both ends of the base plate 62 are provided with two side plates 63 extending toward the sides of the aluminum cladding 11. A fork 64 is provided between the side plates 63, and a waist-shaped connecting block 61 is provided on the inner side of the side plate 63. Simultaneously, the pallet 6 is provided with a reinforcing edge 65 continuously distributed around the edges of the base plate 62 and the side plates 63, as well as the edge of the fork 64. The side plate 63 is provided with a welding port corresponding to the waist-shaped connecting block 61. After the support plate 6 is placed on the bottom of the device, the waist-shaped connecting block 61 is welded to the welding port and then ground to meet the finished product requirements. Based on this, the bottom plate 62 adopts an I-beam-like design that is wide at both ends and narrow in the middle. This design provides a certain support surface and allows two side plates 63 with sufficient span to be extended to correspond to the waist-shaped opening 16, providing an effective welding position for the waist-shaped connecting block 61 and providing effective clamping force, while ensuring... The side cooling tank 71, the non-metallic liquid cooling tank 5, and the tray 1 are integrated; the reinforcing edge 65 is used to improve the structural strength of the entire tray 6, especially by forming multiple turning surfaces at multiple turning points of the bottom plate 62 and the side plate 63, providing a conductive surface in multiple directions, and having a strong load-bearing capacity; the reinforcing edge 65 has a hole at the top surface of the side plate 63, which is used to form a fixed connection with the aluminum cladding 11 and the top cover 2 by bolts, and to form a support relationship for the bottom of the non-metallic liquid cooling tank 5, thereby further improving the overall reliability of the device.

[0028] To further achieve lightweight design, the spacer assembly 3 provided by this invention includes two vertical plates 31 and one horizontal plate 32 arranged in a crisscross pattern. Both the vertical plates 31 and the horizontal plate 32 are made of ultra-high molecular weight polyethylene. Each of the vertical plates 31 and the horizontal plate 32 has a connection hole 33 at its bottom, and a positioning component 8 that connects to the inner bottom of the tray 1 is installed in the connection hole 33. The bottom of the horizontal plate 32 has an assembly port that interlocks with the vertical plates 31, and multiple positioning components 8 are used for positioning. This provides an effective 2×3 battery cell, significantly reducing weight compared to welded metal separators. Furthermore, it is corrosion-resistant, resistant to high and low temperature environments, and offers a certain degree of buffering compared to rigid contact, allowing for a small offset buffer margin for adjacent batteries, which is beneficial for improving battery connection quality and actual working performance.

[0029] To improve the quick connection performance between the connecting hole 33 and the positioning component 8, the connecting hole 33 provided by this invention is a conical hole, and the midpoint diameter of the conical hole is greater than the thickness of the vertical plate 31 and the horizontal plate 32. This allows the positions where the connecting hole 33 is opened on the vertical plate 31 and the horizontal plate 32 to be hollow, making it convenient to adjust the positioning component 8 with a wrench. The positioning component 8 includes a positioning internal stud 81 welded to the inner bottom of the aluminum cladding 11. The positioning internal stud 81 is provided with an internal hexagon bolt 82 that is threadedly connected to it. A positioning post is provided at the top of the conical hole. The axial length of the positioning post is mainly to meet the positioning requirements of the spring 83 and does not affect the up and down adjustment of the positioning component. A spring 83 that mates with the top surface of the internal hexagon bolt 82 is provided on the outside of the positioning post. Using an Allen wrench, rotate the socket head cap screw 82 until it is evenly screwed into the positioning stud. At the same time, the head of the socket head cap screw 82 gradually opens the tapered hole, and the wall of the tapered hole clamps the head of the socket head cap screw 82 to prevent it from loosening automatically. Attach the spring 83 to the positioning post, and the spring 83 pre-tightens the head of the socket head cap screw 82, further preventing significant loosening. The connecting hole 33 and the positioning component 8 are concealed, not occupying additional space, which is beneficial for the overall arrangement of necessary components inside the device.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A lightweight battery holder, comprising a tray and a top cover, wherein the tray has an internal spacer assembly and connecting beams are provided around its perimeter, characterized in that, The tray includes an aluminum cladding layer. A metal reinforcing plate is arranged around the bottom of the aluminum cladding layer. A non-metallic liquid cooling tank is located inside the metal reinforcing plate. A support plate is located at the bottom of the non-metallic liquid cooling tank. The two sides of the support plate are connected to the sides of the tray. The top cover includes a left cover plate, a middle cover plate, and a right cover plate, which are sequentially arranged and bolted to the tray. Each of the left, middle, and right cover plates has an upper pipe opening on its side. A self-closing groove is provided between the middle cover plate and the left and right cover plates. A dovetail structure is provided in the middle of the self-closing groove. A non-metallic cover plate that mates with the dovetail structure is provided in the self-closing groove. The two sides of the non-metallic cover plate are tightly fitted to the groove walls of the self-closing groove. Both the non-metallic cover plate and the non-metallic liquid cooling tank are made of ultra-high molecular weight polyethylene.

2. The lightweight battery holder according to claim 1, characterized in that, The side of the metal reinforcing plate is provided with a lower pipe opening, and the side of the non-metallic liquid cooling tank is provided with a corresponding interface to the lower pipe opening.

3. A lightweight battery holder according to claim 2, characterized in that, The aluminum cladding has an upper and lower plate on its side. Two sets of side cooling channels are symmetrically distributed between the upper and lower plates on both sides of the aluminum cladding. The side cooling channels are made of ultra-high molecular weight polyethylene material and have a central pipe opening on their side.

4. A lightweight battery holder according to claim 3, characterized in that, The side cooling groove assembly includes two L-shaped side cooling grooves. The L-shaped openings of the side cooling grooves are matched with the right-angled edges of the aluminum cladding. The opposite surfaces of the two side cooling grooves are provided with external insertion tubes and internal slots.

5. A lightweight battery holder according to claim 4, characterized in that, The side of the metal reinforcing plate is provided with multiple waist-shaped openings, and the side of the non-metallic liquid cooling tank is provided with waist-shaped grooves corresponding to the waist-shaped openings. Waist-shaped connecting blocks are provided in the waist-shaped openings and waist-shaped grooves.

6. A lightweight battery holder according to claim 5, characterized in that, The pallet includes a base plate, and two side plates extending toward the aluminum cladding are provided at both ends of the base plate. A fork is provided between the side plates, and the waist-shaped connecting block is provided on the inner side of the side plate.

7. A lightweight battery holder according to claim 6, characterized in that, The pallet is provided with a reinforcing edge that is continuously distributed around the edges of the bottom plate and side plates, as well as the edge of the bifurcation.

8. A lightweight battery holder according to claim 7, characterized in that, The spacer assembly includes two vertical plates and one horizontal plate arranged in a crisscross pattern. The bottom of both the vertical and horizontal plates is provided with a connection hole, and a positioning component that connects to the inner bottom of the tray is provided in the connection hole.

9. A lightweight battery holder according to claim 8, characterized in that, The positioning component includes a positioning internal stud, in which a hexagon socket head cap screw is threadedly connected. The connecting hole is a tapered hole, and a positioning post is provided at the top of the tapered hole. A spring that mates with the top surface of the hexagon socket head cap screw is provided on the outside of the positioning post.

10. A lightweight battery holder according to claim 9, characterized in that, Both the vertical and horizontal plates are made of ultra-high molecular weight polyethylene.

Images