Connector reinforcement structure and battery box containing it

Abstract

This invention provides a connector reinforcement structure and a battery case containing the same, which are used for installation in a non-metallic composite material housing. The connector reinforcement structure includes: a first reinforcement portion surrounding the connector pre-drilled opening of the housing and connecting to the inner surface of the housing; and a second reinforcement portion connected to the first reinforcement portion, forming at least a cavity. The cavity communicates with the connector pre-drilled opening at the first reinforcement portion, and the cavity has an upward-facing opening with an edge height higher than the potting height inside the housing. By providing the connector reinforcement structure, this connector reinforcement structure and the battery case containing it can form an isolation area connecting to the connector pre-drilled opening near the housing, preventing the flow of adhesive from blocking the connector pre-drilled opening. Furthermore, the connection between the cavity and the connector pre-drilled opening allows for subsequent battery cable routing and other operations.

Description

[0001] This application claims priority to Chinese patent application 202111567173.8, filed on December 20, 2021. The entire contents of the aforementioned Chinese patent application are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of vehicle battery swapping technology, and in particular to a connector reinforcement structure and a battery box containing the same. Background Technology

[0003] Electric vehicles (EVs) are increasingly favored by users due to their advantages of zero emissions, low noise, and high cost-effectiveness in operation and maintenance. EVs use electricity provided by their onboard battery packs, which need to be recharged after the battery is depleted. EV battery packs are generally installed in two ways: fixed and swappable. Fixed battery packs are typically mounted on the vehicle and are charged directly from the vehicle. Swappable battery packs, on the other hand, are usually mounted on a bracket on the vehicle using a removable installation method. The battery pack can be removed for individual replacement or charging, and then reinstalled on the vehicle after charging.

[0004] Replaceable battery packs (quick-swap battery packs) are equipped with electrical / hydraulic connectors. When the battery pack is connected to the vehicle body, it connects to the vehicle's electrical / hydraulic connector to supply power to the electric vehicle. After the battery pack is removed from the vehicle, it is sent to a charging station to connect to the station's electrical connector for charging. Throughout the entire lifespan of the replaceable battery pack, the electrical / hydraulic connector must meet reliability requirements. Unreliable or improper connections can cause vehicle alarms or even power interruptions. Therefore, the strength of the electrical / hydraulic connector in a quick-swap battery pack is a crucial factor affecting its lifespan. Despite the disadvantages of metal materials, such as high thermal conductivity and poor insulation, most quick-swap battery packs on the market use metal battery boxes, leveraging the inherent strength of the metal box to meet the strength requirements of the electrical / hydraulic connector. It is precisely because of the high strength requirements of the electrical / hydraulic connector in quick-swap battery packs that the application of non-metallic composite materials, which have good processing and insulation properties but lower strength than metal materials, faces significant obstacles in the field of quick-swap battery packs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect of low strength of non-metallic composite material housings at the electrical / hydraulic connector interface in the prior art, and to provide a connector reinforcement structure and a battery box containing the same.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A connector reinforcement structure is provided for installation in a housing made of non-metallic composite material. The connector reinforcement structure includes: a first reinforcement portion for surrounding the periphery of a connector pre-reserved opening in the housing and connecting to the inner surface of the housing; and a second reinforcement portion connected to the first reinforcement portion, at least forming a cavity, the cavity communicating with the connector pre-reserved opening at the first reinforcement portion, the cavity having an upwardly facing opening.

[0008] In this solution, a connector reinforcement structure is incorporated, consisting of a first reinforcement section and a second reinforcement section. The first reinforcement section is positioned inside the housing near the connector pre-drilled opening, encircling the periphery of the connector pre-drilled opening. This connection between the first reinforcement section and the housing ensures stable and reliable connection between the first reinforcement section and the inner surface of the housing. This reinforcement enhances the area surrounding the connector mounting, improving connector reliability and promoting the application of composite material non-metallic battery boxes in the field of quick-change battery packs.

[0009] A second reinforcing section is provided and connected to the first reinforcing section. The second and first reinforcing sections together form a cavity at the connector pre-reserved opening. This cavity is used to block the glue injected into the box. It can form an isolation area connecting the connector pre-reserved opening of the box near the box, preventing the glue from flowing into the cavity when thermally conductive glue (used to promote temperature equalization inside the battery pack and prevent thermal runaway) is injected into the battery box. This prevents the glue from flowing and blocking the connector pre-reserved opening. The cavity and the connector pre-reserved opening are connected to form a channel. This isolation area and channel can be used for subsequent battery cable arrangement and other work.

[0010] Preferably, the cavity is formed by the first reinforcing part and the second reinforcing part, which are connected to the housing by bonding or welding.

[0011] In this design, the structure formed by the joint enclosure of the first and second reinforcing parts saves material in the connector reinforcement structure and improves its overall strength. Furthermore, the cavity created by the enclosure can also be used to accommodate other components. While the cavity serves to block the injected adhesive, it can also be used to arrange subsequent battery cables, achieving two purposes with a single cavity, increasing its utilization rate and realizing a dual-use functionality. Simultaneously, by bonding or welding the first and second reinforcing parts together, compared to other connection methods, the first and second reinforcing parts have a larger fixed area relative to the housing, thus strengthening each other and improving the overall structural strength of the assembly.

[0012] Preferably, the edge height of the opening is set to be higher than the glue filling height inside the box.

[0013] In this design, the cavity is equipped with an upward-facing opening, the edge of which is higher than the height of the adhesive being poured into the housing. This structural design eliminates the possibility of adhesive overflow or spread into the cavity during the adhesive pouring process. Therefore, by incorporating a connector reinforcement structure at the connector's pre-drilled opening, the adhesive pouring step is significantly simplified, greatly reducing its difficulty and increasing the success rate.

[0014] Preferably, the first reinforcing part includes: a back plate, the back plate being spaced apart from the inner surface of the housing; an extension structure, the extension structure extending from the edge of the back plate toward the inner surface of the housing and forming a hollow portion with the back plate that opens toward the inner surface of the housing, the extension structure having a folded edge at the inner surface of the housing, the folded edge being abutting the inner surface of the housing and being connected to the housing by adhesive or welding; and a reinforcing rib, the reinforcing rib being located within the hollow portion formed by the extension structure and the back plate, the reinforcing rib being formed on the surface of the back plate, and the end of the reinforcing rib being connected to the surface of the extension structure.

[0015] In this design, the structure extends inward from the inner surface of the housing, with a back panel preventing further extension after a certain distance. This section extending from the inner surface of the housing is called the extension structure, and the distance between the back panel and the inner surface of the housing is the length of the extension structure, as described above, where the back panel and the inner surface of the housing are spaced apart. Setting the extension structure towards the inner surface of the housing as a hollow section saves material while enhancing the overall strength of the extension structure. Furthermore, the connection between the extension structure and the inner surface of the housing is designed as a folded edge structure, which fits snugly against the inner surface of the housing, increasing the contact area between the extension structure and the inner surface of the housing. The folded edge is then bonded or welded to connect the extension structure and the inner surface of the housing, reinforcing the connection between the first reinforcing part and the housing, thereby improving the structural strength of the entire assembly. Meanwhile, the inner surface of the extension structure facing the housing is designed as a hollow section, and a reinforcing rib is installed within the hollow section. This reinforcing rib is located on the inner surface of the back panel facing the housing, with one end connected to the inner surface of the housing and the other end connected to the back panel. This design saves material while increasing the deformability of the extension structure when connected to the inner surface of the housing, and enhances the stability and reliability of the connection. Therefore, adopting the above-described structure for the first reinforcing section not only improves the connection strength between the first reinforcing section and the housing but also further enhances its overall strength.

[0016] Preferably, the second reinforcing part has a surrounding plate for surrounding the connector pre-reserved opening on the inside of the housing, the top of the surrounding plate being higher than the potting height inside the housing, and the bottom of the surrounding plate extending to the bottom surface inside the housing.

[0017] In this design, the connector pre-drilled port is located on the side of the enclosure, and a second reinforcing section surrounds it. A cavity is formed between the second and first reinforcing sections, and the connector pre-drilled port communicates with the cavity, preventing obstruction of subsequent battery cable installations. The second reinforcing section forms the cavity by enclosing the first reinforcing section with a surrounding plate. The advantage of this surrounding plate is that it enhances the stability and reliability of the connection between the second and first reinforcing sections. During the process of injecting adhesive into the enclosure, the adhesive, being fluid, can spread to the connector pre-drilled port and block it. Therefore, the top of the surrounding plate is higher than the height of the adhesive being injected into the enclosure, and the bottom of the surrounding plate extends to the bottom surface of the enclosure. When adhesive is needed later, the surrounding plate effectively prevents the spread and flow of the adhesive, preventing it from flowing into the cavity. There is also no need to consider whether the adhesive will overflow into the cavity and block the connector pre-drilled port. Therefore, for enclosures using this connector reinforcement structure, the implementation difficulty of injecting adhesive into the enclosure is effectively reduced, increasing the success rate.

[0018] Preferably, the enclosure includes: two side plates, one end of each side plate near the inner surface of the housing is connected to the first reinforcing part, and the other end of each side plate faces the interior of the housing and extends into the housing; and an end plate, both ends of which are connected to the ends of the two side plates facing the interior of the housing and extending into the housing.

[0019] In this design, the enclosure includes two side panels and a middle end panel. The two side panels and the middle end panel together connect to the first reinforcing part to form a cavity. One end of the two side panels near the inner surface of the housing is connected to the first reinforcing part, and the other end of the two side panels, facing the interior of the housing, is connected to the end panel. This structural form allows for better formation of a closed cavity, further isolating the spread of colloid. Furthermore, the end panel and the two side panels are detachably connected, reducing the processing difficulty of the end panels and side panels and facilitating their replacement by workers.

[0020] Preferably, the second reinforcing part further includes: a base plate, the base plate being located below the two side plates, one side surface of the base plate being connected to the two side plates respectively, and the other side surface of the base plate being used to connect to the bottom surface of the housing.

[0021] In this solution, by setting a base plate below the two side plates, the lower surface of the base plate is connected to the bottom surface of the housing. Thus, the second reinforcing part and the lower surface of the housing are connected at multiple points. By increasing the contact area between the second reinforcing part and the lower surface of the housing, not only can the strength of its own structure be increased, but also the stability and firmness of the connection between the entire connector reinforcement structure and the housing can be enhanced.

[0022] Preferably, the connector reinforcement structure further includes a third reinforcement portion connected to the first reinforcement portion, the third reinforcement portion forming a channel for passing through the connector pre-reserved opening, the channel communicating with the cavity.

[0023] In this design, the third reinforcing part is inserted into the connector's pre-drilled opening, and the third reinforcing part is connected to the first reinforcing part. This forms a channel between the third reinforcing part and the connector's pre-drilled opening, which communicates with the cavity. This allows the battery cable inside the housing to freely extend from the inside of the housing into the cavity, and then through the channel to the outside of the housing. The purpose of the cavity, as described above, is not only to prevent the spread of the injected adhesive but also to accommodate or arrange the battery cables inside the housing. Therefore, this structure provides further protection for the battery cable as it extends from the inside of the housing to the outside. Furthermore, connecting the third and first reinforcing parts enhances the overall structural strength of the connector reinforcement structure and its connection to the housing.

[0024] Preferably, the third reinforcing part is integrally formed with the first reinforcing part.

[0025] In this design, the third and first reinforcing parts are integrated into a single structure. By increasing the contact area between the first and third reinforcing parts, the overall structural strength and rigidity of the connector reinforcement structure are increased. This, in turn, improves the strength and rigidity of the connection between the connector reinforcement structure and the housing, better ensuring the connection strength at the connector's pre-drilled opening. This also more effectively protects the battery cables inside the housing from freely extending to the outside. Furthermore, the length direction of the channel formed by the third reinforcing part and the connector pre-drilled opening is aligned with the direction of the reinforcing ribs on the hollowed-out portion of the first reinforcing part—both are radially perpendicular to the inner surface of the housing. This facilitates core pulling within the channel, making the integrated structure of the third and first reinforcing parts more convenient in the molding process.

[0026] Preferably, the connector reinforcement structure further includes thermal insulation material disposed within the cavity.

[0027] In this design, the insulation material can include at least flexible, lightweight insulation materials such as insulation cotton or insulation felt, or similar materials, which are filled into the cavity. By placing insulation material inside the cavity, the overall thermal insulation effect of the connector reinforcement structure can be improved.

[0028] A battery case comprising a housing of non-metallic composite material, the battery case further comprising a connector reinforcement structure as described in any of the preceding claims.

[0029] In this design, a connector reinforcement structure is installed on the battery box. When the battery box is filled with a colloid, the purpose of this filling is to ensure even heating of each battery cell through the flow and spread of the colloid, reducing temperature differences between cells and minimizing the impact of temperature variations. To prevent the colloid from blocking the connector opening as it spreads inside the box, a connector reinforcement structure is installed at the connector opening. This structure forms a cavity at the connector opening facing inwards, not only preventing the colloid from spreading but also providing space for subsequent arrangements such as battery cables extending from the connector opening within the box.

[0030] Preferably, the connector reinforcement structure further includes a third reinforcement portion connected to the first reinforcement portion, the third reinforcement portion forming a channel for passing through the connector pre-reserved opening, the channel communicating with the cavity, and the third reinforcement portion being connected to the connector pre-reserved opening by bonding or welding.

[0031] In this design, the third reinforcing part is inserted into the connector's pre-drilled opening, and the third reinforcing part is connected to the first reinforcing part. This forms a channel between the third reinforcing part and the connector's pre-drilled opening, which communicates with the cavity. This allows the battery cable inside the housing to freely extend from the inside of the housing into the cavity, and then through the channel to the outside of the housing. The purpose of the cavity, as described above, is not only to prevent the spread of the injected adhesive but also to accommodate or arrange the battery cables inside the housing. Therefore, this structure provides further protection for the battery cable as it extends from the inside of the housing to the outside. Simultaneously, the connection between the third and first reinforcing parts enhances the overall structural strength of the connector reinforcement structure and its connection strength with the housing. Furthermore, connecting the third reinforcing part to the connector's pre-drilled opening via bonding or welding increases the contact area between the third reinforcing part and the connector's pre-drilled opening, enhancing the stability of the bond and improving the overall structural strength of the connector reinforcement structure and the housing.

[0032] Preferably, the enclosure includes an inner housing and an outer housing that are stacked opposite each other, and the connector pre-reservation opening is provided through the inner housing and the outer housing; the first reinforcing part is connected to the inner housing, and the third reinforcing part is at least connected to the outer housing and covers the seam between the inner housing and the outer housing at the connector pre-reservation opening.

[0033] In this solution, the aforementioned structural design, with its multi-layered structure, enhances the internal insulation of the enclosure. When the enclosure is formed by stacking inner and outer shells, the third reinforcing section covers the seam between the inner and outer shells at the connector opening, further improving the sealing effect at the seam and ensuring the enclosure's thermal insulation performance at the connector opening.

[0034] Preferably, the enclosure includes an upper enclosure unit and a lower enclosure that are arranged opposite to each other, and the connector reserved opening of the enclosure is opened on the lower enclosure.

[0035] In this design, the connector pre-drilled opening is located on the lower housing, which facilitates the processing of composite material parts.

[0036] Preferably, the third reinforcing part is connected to the lower housing by welding and is connected to the connector reserved opening.

[0037] In this design, compared to installing the third reinforcing part in the middle of the upper and lower housings, connecting the third reinforcing part to the lower housing facilitates the injection molding of both the upper and lower housings and streamlines the connection between them. Furthermore, using adhesive or welding to fix the third reinforcing part to the lower housing enhances the stability of the connection and improves the overall structural strength of the connector reinforcement structure. Moreover, as mentioned above, fixing the third reinforcing part to the connector's pre-drilled port strengthens the connection between them, facilitates the disassembly and installation of the third reinforcing part, and improves the sealing performance between the third reinforcing part and the connector's pre-drilled port.

[0038] Preferably, the battery box further includes an electrical connector, which is connected to a connecting plate fixed to the outside of the box and is located at the connector pre-drilled opening. In this embodiment, the battery box body includes an inner shell and an outer shell, with the outer shell covering the outer surface of the inner shell, and the outer shell being covered by the connecting plate, i.e., the box body is covered by the connecting plate. The first and second reinforcing parts of the connector reinforcement structure are connected to the inner surface of the inner shell, and the third reinforcing part penetrates through the connector pre-drilled opening, with one end connected to the connecting plate and the other end connected to the first reinforcing part on the inner surface of the inner shell. The battery box also includes an electrical connector, which is located at the connector pre-drilled opening, i.e., the electrical connector is connected to the connecting plate on the outer surface of the box body and inserted into the connector pre-drilled opening to connect with internal components.

[0039] The positive and progressive effects of this invention are as follows: The connector reinforcement structure and the battery box containing it, by setting the connector reinforcement structure and dividing it into a first reinforcement part and a second reinforcement part, and placing the first reinforcement part on the inner side of the box near the connector pre-reserved opening (i.e., surrounding the connector pre-reserved opening of the box), allows the first reinforcement part to connect with the box, achieving stability and reliability of the connection between the first reinforcement part and the inner surface of the box. This strengthens the area around the connector installation, improves the reliability of the connector operation, and promotes the application of composite material non-metallic battery boxes in the field of quick-change battery packs. The second reinforcement part is set and connected to the first reinforcement part, forming a cavity. This cavity is used to block the colloid injected into the box, creating an isolation area near the connector pre-reserved opening of the box that connects to the connector pre-reserved opening, preventing the colloid flow from blocking the connector pre-reserved opening. Furthermore, the cavity and the connector pre-reserved opening are connected, allowing for subsequent battery cable routing and other operations. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the battery box according to a preferred embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of the overall structure of the battery box from another perspective, representing a preferred embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of the housing with connector reinforcement structure according to a preferred embodiment of the present invention.

[0043] Figure 4 In this invention Figure 3 A magnified view of a portion of point A in the middle.

[0044] Figure 5 This is a schematic diagram of the structure of the box body according to a preferred embodiment of the present invention.

[0045] Figure 6 This is a structural schematic diagram of the box body from another perspective in a preferred embodiment of the present invention.

[0046] Figure 7 In this invention Figure 6 A magnified view of a section at point B.

[0047] Figure 8 This is a schematic diagram of the overall structure of the connector reinforcement structure according to a preferred embodiment of the present invention.

[0048] Figure 9 This is a schematic diagram of the overall structure of the connector reinforcement structure from another perspective, representing a preferred embodiment of the present invention.

[0049] Figure 10 This is a schematic diagram of the overall structure of the connector reinforcement structure according to a preferred embodiment of the present invention, viewed from below.

[0050] Figure 11 This is a cross-sectional view of the housing according to a preferred embodiment of the present invention.

[0051] Figure 12 This is a cross-sectional view of the housing from another perspective in a preferred embodiment of the present invention.

[0052] Figure 13 This is a schematic diagram of the upper cover of an experimental example of the present invention.

[0053] Figure 14 This is a schematic diagram of the lower housing structure of an experimental example of the present invention.

[0054] Explanation of reference numerals in the attached figures:

[0055] Connector reinforcement structure 1

[0056] First Reinforcement Section 11

[0057] Back panel 111

[0058] Extension structure 112

[0059] Hollowed-out section 113

[0060] Reinforcing rib 114

[0061] 115 folded edge

[0062] Second Reinforcement Section 12

[0063] Enclosure 121

[0064] Side panel 1211

[0065] End plate 1212

[0066] Base plate 122

[0067] Screw 123

[0068] Third Enhancement Section 13

[0069] Cavity 14

[0070] Box 2

[0071] Inner surface 21 of the box

[0072] Connector reserved slot 22

[0073] Upper box unit 23

[0074] Box lid outer shell 231

[0075] Insulation layer 232

[0076] Protective layer 233

[0077] Lower box 24

[0078] Inner casing 25

[0079] Outer casing 26

[0080] Strengthening Structure 261

[0081] Recess 262

[0082] Reinforcing rib 263

[0083] Connecting plate 27

[0084] Battery Box 3

[0085] Electrical connector 4 Detailed Implementation

[0086] The following is a preferred embodiment, in conjunction with the accompanying drawings. Figure 1-12 To explain the invention more clearly and completely.

[0087] Example

[0088] Specifically, such as Figure 2-3As shown, the present invention provides a connector reinforcement structure 1 for installation on the inner side of a non-metallic composite material housing 2.

[0089] The connector reinforcement structure 1 specifically includes a first reinforcement part 11 and a second reinforcement part 12. In this embodiment, the first reinforcement part 11 and the second reinforcement part 12 are integrally formed structures, seamlessly connected, and together constitute the aforementioned connector reinforcement structure 1. Furthermore, the first reinforcement part 11 and the second reinforcement part 12 are connected to the housing 2 by bonding or welding, that is, the entire connector reinforcement structure 1 is fixedly connected to the inner surface 21 of the housing by bonding or welding.

[0090] Specifically, in this embodiment, adhesive bonding is preferred to fix the first reinforcing part 11 and the second reinforcing part 12 relative to the housing 2. Compared to other connection methods, adhesive bonding allows for a larger fixing area of ​​the first reinforcing part 11 and the second reinforcing part 12 relative to the housing 2, thereby strengthening the first reinforcing part 11 and the second reinforcing part 12 with the housing 2 and improving the structural strength of the entire connector reinforcement structure 1. Furthermore, when the housing is made of non-metallic composite material, adhesive bonding provides higher connection reliability. Additionally, adhesive bonding facilitates rectification and disassembly in case of improper bonding or errors. The specific connection method between the connector reinforcement structure 1 and the housing 2 can be configured as needed.

[0091] like Figure 3-4 As shown, the first reinforcing part 11 is located on the inner surface 21 of the housing, and the first reinforcing part 11 is connected around the periphery of the connector reserved opening 22, which can realize the stability and reliability of the connection between the first reinforcing part 11 and the inner surface 21 of the housing.

[0092] like Figure 5 As shown, the second reinforcing part 12 and the first reinforcing part 11 are seamlessly connected, and the second reinforcing part 12 and the first reinforcing part 11 together form a cavity 14. The cavity 14 is located directly in front of the connector reserved opening 22 near the inner side of the housing 2, and the cavity 14 communicates with the connector reserved opening 22.

[0093] To balance the temperature differences among the battery cells (not shown in the diagram) within housing 2, a fluid will be injected into housing 2. This fluid is fluid and will flow and spread within housing 2, thereby reducing the temperature differences among the battery cells. However, as the fluid flows and spreads within housing 2, it will reach the connector pre-drilled port 22 and block it, preventing the connector pre-drilled port 22 from functioning properly.

[0094] Therefore, in this embodiment, the purpose of setting the cavity 14 is to block the colloid injected into the housing 2, forming an isolation area near the connector reserved port 22 of the housing 2, thus preventing the colloid from flowing into the cavity 14 and blocking the connector reserved port 22. Furthermore, the cavity 14 and the connector reserved port 22 are connected to form a channel, which can be used for subsequent work such as cable arrangement of the battery cells. The advantages of setting the cavity 14 are that it can improve the overall strength of the connector reinforcement structure 1 while saving material. Moreover, the cavity 14 formed by the enclosure can also be used to load other components. While blocking the injected colloid, the cavity 14 can also be used for subsequent work such as cable arrangement of the battery cells, achieving two functions with the same cavity 14, increasing the space utilization of the housing 2, and realizing a dual-purpose function.

[0095] And, as Figure 5 As shown, the cavity 14 is positioned upwards, and an upward-facing opening structure is provided on the cavity 14. Furthermore, the edge height of each baffle on the second reinforcing part 12 constituting the cavity 14 is higher than the height of the colloid injected into the housing 2. Through this structural design, during the process of injecting colloid into the housing 2, there is no need to consider the possibility of colloid overflow or spread into the cavity 14. Therefore, by providing the connector reinforcing structure 1 at the connector pre-reserved opening 22 in the housing 2, the implementation difficulty of injecting colloid into the housing 2 can be effectively reduced, and the success rate can be significantly improved.

[0096] In this embodiment, the connector reinforcement structure 1 is installed inside the housing 2, which is at least a non-metallic composite material. Therefore, in this embodiment, the connector reinforcement structure 1 is installed inside a non-metallic composite material. However, the connector reinforcement structure 1 can also be installed on other materials as needed, such as cast iron.

[0097] like Figure 6 As shown, a groove is provided on the inner surface 21 of the first reinforcing part 11 facing the housing. This groove is used to accommodate the adhesive that connects to the inner surface 21 of the housing. Compared to other solutions where the adhesive is directly applied to the first reinforcing part 11 and the inner surface 21 of the housing, this method enhances the stability of the bond, prevents relative sliding between the bonded ends, and avoids the adhesive slippage that could reduce the bonding effect and reliability. This, in turn, improves the overall structural strength of the connector reinforcing structure 1 and the housing 2. Furthermore, the groove to accommodate the adhesive effectively prevents adhesive overflow and other problems.

[0098] like Figure 5-6As shown, the first reinforcing part 11 includes a back plate 111 and an extension structure 112. The back plate 111 is disposed at a distance from the inner surface 21 of the housing. The extension structure 112 extends from the inner surface 21 of the housing towards the interior of the housing 2. After extending a certain distance, the back plate 111 is set to prevent it from extending further. Therefore, the section of structure extending from the inner surface 21 of the housing is the extension structure 112. So the distance between the back plate 111 and the inner surface 21 of the housing is the length of the extension structure 112, that is, the back plate 111 is spaced apart from the inner surface 21 of the housing.

[0099] One side of the extension structure 112 is a back plate 111, and the other side has an opening structure facing the inner surface 21 of the box. The extension structure 112 with the back plate 111 facing the inner surface 21 of the box is a hollow part 113. That is, the extension structure 112 is set with a hollow part 113. The purpose of adopting this structure is to enhance the overall strength of the extension structure 112 while saving materials.

[0100] like Figure 6 As shown, multiple reinforcing ribs 114 extending in the same direction are provided inside the aforementioned hollow portion 113. These reinforcing ribs 114 are located on the surface of the back plate 111, extending to the entire extension structure 112. The reinforcing ribs 114 extend from the surface of the back plate 111 to the inner surface 21 of the housing, meaning the length of the reinforcing rib 114 is consistent with the width of the extension structure 112. In other words, one end of the reinforcing rib 114 is connected to the inner surface 21 of the housing, and the other end is connected to the back plate 111. The purpose of providing the reinforcing ribs 114 and adopting this structural form is to save material while reducing the deformation of the extension structure 112 when connected to the inner surface 21 of the housing, and to enhance the stability and reliability of the connection between the first reinforcing portion 11 and the housing 2.

[0101] Of course, in other embodiments, the reinforcing rib 114 may be configured inside the extension structure 112 as follows:

[0102] The first type extends radially and vertically along the inner surface 21 of the box, and is arranged in a staggered manner with equal intervals in the extension structure 112.

[0103] The second type extends radially and vertically along the inner surface 21 of the box, and is intersected within the extension structure 112.

[0104] All of the above structural design schemes can achieve the goal of enhancing stability and reliability, and therefore can be freely selected according to actual needs.

[0105] like Figure 6As shown, in this embodiment, the first option is preferred. This allows the staggered connection of the reinforcing ribs 114 to enhance the stability of the extension structure 112 and the reliability of its connection to the inner surface 21 of the housing, while also reducing the deformability of the extension structure 112. Compared to other solutions, without increasing the thickness of the back plate 111 or the extension structure 112, or without using a material with high rigidity, the staggered arrangement of the reinforcing ribs 114 can significantly improve the stability of the extension structure 112.

[0106] Among them, such as Figure 6 As shown, a flange 115 is provided at the connection between the extension structure 112 and the inner surface 21 of the housing. The flange 115 extends in the opposite direction to the extension structure 112, that is, it extends towards the lower surface away from the housing 2 and / or towards the connector reserved opening 22. The flange 115 fits against the inner surface 21 of the housing, that is, the first reinforcing part 11 achieves a seamless connection with the inner surface 21 of the housing through the flange 115. The flange 115 structure increases the contact area between the extension structure 112 and the inner surface 21 of the housing. By using adhesive or welding to connect the extension structure 112 and the inner surface 21 of the housing, the connection between the first reinforcing part 11 and the housing 2 is mutually reinforced, thereby improving the structural strength of the entire assembly. Therefore, adopting the above-described structure for the first reinforcing part 11 not only improves the connection strength between the first reinforcing part 11 and the housing 2, but also further improves its overall strength.

[0107] like Figure 7 As shown, the second reinforcing part 12 in this embodiment includes a surrounding plate 121 and a bottom plate 122. The surrounding plate 121 is used to surround the connector reserved opening 22 on the inside of the housing 2, that is, the surrounding plate 121 and the first reinforcing part 11 together form a cavity 14 at the connector reserved opening 22 facing the inside of the housing 2. The top height of the surrounding plate 121 is higher than the potting height inside the housing 2, and the bottom end of the surrounding plate 121 extends to the bottom surface inside the housing 2. The advantage of setting the surrounding plate 121 is that it can enhance the stability and reliability of the connection of the second reinforcing part 12.

[0108] The enclosure 121 includes two side plates 1211 and a middle end plate 1212. The two side plates 1211 and the middle end plate 1212 are connected to the first reinforcing part 11 to form a cavity 14. One end of the two side plates 1211 near the inner surface 21 of the housing is connected to the first reinforcing part 11, and the other end of the two side plates 1211, facing the interior of the housing 2, is connected to the end plate 1212. This structure allows for better formation of a closed cavity 14, further isolating the spread of colloid. Furthermore, the end plate 1212 and the two side plates 1211 are detachably connected, reducing the processing difficulty of the end plate 1212 and the side plates 1211, and facilitating the replacement of the end plate 1212 and the side plates 1211 by workers.

[0109] In this embodiment, the two side plates 1211 and the first reinforcing part 11 are integrally formed. Since the cavity 14 is used to prevent the flow and spread of the adhesive to the connector pre-reserved opening 22, and is also used for subsequent cable routing, connecting the two side plates 1211 and the first reinforcing part 11 into an integral structure only requires setting the end plate 1212 to a detachable connection state. When maintenance or replacement is needed, only the end plate 1212 needs to be disassembled to solve the problem. This eliminates the need for workers to disassemble the two side plates 1211 and the end plate 1212 separately, reducing workload and simplifying the process. Furthermore, the integral forming process increases the connection area between the two side plates 1211 and the first reinforcing part 11, thereby improving the strength and rigidity of the connection at that point.

[0110] like Figure 7 As shown, the base plate 122 is located below the two side plates 1211, meaning one side surface of the base plate 122 is connected to both side plates 1211, and the opposite side surface of the base plate 122 is used to connect to the bottom surface of the housing 2. Therefore, the second reinforcing part 12 and the lower surface of the housing 2 are connected at multiple points. By increasing the contact area between the second reinforcing part 12 and the lower surface of the housing 2, not only can the strength of the structure itself be increased, but the stability and robustness of the connection between the entire connector reinforcing structure 1 and the housing 2 can also be enhanced.

[0111] In this embodiment, screws 123 are provided on the surface of the base plate 122, that is, the end plate 1212 is vertically installed inside the housing 2, and when it is installed on the side surface of the base plate 122 facing the inside of the housing 2, after the side surface of the end plate 1212 and the base plate 122 are completely attached, screws 123 are installed on the overlapping surface of the end plate 1212 and the base plate 122 to fasten the base plate 122 and the end plate 1212 together.

[0112] The specific installation sequence and method of the second reinforcing part 12 can be set as needed. The advantage of using screws 123 to connect the two is that it can improve the connection strength and rigidity of the connector reinforcing structure 1 at that point, and ensure that the strength of the connector reinforcing structure 1 itself is greater than the force exerted by the adhesive on the outer surface of the connector reinforcing structure 1 during the process of filling the housing 2 with adhesive.

[0113] like Figure 5-6 As shown, the connector reinforcement structure 1 also includes a third reinforcement part 13.

[0114] When the third reinforcing part 13 is inserted into the connector reserved opening 22, a channel is formed between the third reinforcing part 13 and the connector reserved opening 22, connecting the third reinforcing part 13 and the first reinforcing part 11. This channel is connected to the cavity 14, allowing the cables of the battery cells inside the housing 2 to freely extend from inside the housing 2 into the cavity 14, and then through the channel to the outside of the housing 2. The purpose of the cavity 14, as described above, is not only to prevent the spread of the injected adhesive, but also to place or arrange the cables of the battery cells inside the housing 2. Therefore, this structure provides further protection for the cables of the battery cells as they extend from inside the housing 2 to the outside. Simultaneously, connecting the third reinforcing part 13 and the first reinforcing part 11 enhances the overall structural strength of the connector reinforcing structure 1 and the strength of its connection with the housing 2.

[0115] In this embodiment, such as Figure 5-6 As shown, the first reinforcing part 11 and the third reinforcing part 13 are configured as an integrally formed structure. By increasing the contact area between the first reinforcing part 11 and the third reinforcing part 13, the structural strength and rigidity of the entire connector reinforcing structure 1 can be increased, thereby improving the strength and rigidity of the connection between the entire connector reinforcing structure 1 and the housing 2. This allows for better connection strength of the connector reinforcing structure 1 at the connector reserved opening 22, and more effectively protects the free extension of the battery core cable inside the housing 2 to the outside of the housing 2. At the same time, the length direction of the channel formed by the third reinforcing part 13 and the connector reserved opening is consistent with the direction of the reinforcing rib 114 on the hollow part 113 in the first reinforcing part 11, both being radially perpendicular to the inner surface 21 of the housing. This makes it easier to pull the core within the channel, thus making the integrally formed structure of the third reinforcing part 13 and the first reinforcing part 11 more convenient in terms of molding process.

[0116] The third reinforcing part 13 is connected to the connector pre-reserved opening 22 by bonding or welding. In this embodiment, as... Figure 6As shown, the reinforcing part is connected to the connector reserved opening 22 by adhesive bonding. The surface of the third reinforcing part 13 facing the connector reserved opening 22 has a groove for accommodating the adhesive used to connect with the connector reserved opening 22. Compared to other solutions where adhesive is directly applied to the third reinforcing part 13 and the connector reserved opening 22, this method enhances the stability of the bond and prevents relative sliding between the bonded ends. This avoids the adhesive slipping, which reduces the bonding effect and reliability. Therefore, the adhesive bonding method between the third reinforcing part 13 and the connector reserved opening 22 improves the structural strength of the entire connector reinforcing structure 1 and the housing 2. Furthermore, the groove for accommodating the adhesive effectively prevents adhesive overflow. The connection method between the third reinforcing part 13 and the connector reserved opening 22 can be customized. For example, when it is necessary to securely connect the third reinforcing part 13 and the connector reserved opening 22 together, welding or other fastening methods can be used without disassembling them, enhancing the tightness and reliability of the connection between the connector reserved opening 22 and the third reinforcing part 13.

[0117] In this embodiment, the connector reinforcement structure 1 also includes thermal insulation material (not shown in the figure). The thermal insulation material is filled in the cavity 14, which can improve the thermal insulation effect of the connector reinforcement structure 1.

[0118] The insulation material can be selected from at least flexible and lightweight materials such as insulation cotton or insulation felt, or similar materials, and filled into the cavity. This not only improves the insulation effect of the enclosure 2 at the connector reserved opening 22, but also improves the thermal insulation effect within the cavity 14.

[0119] like Figure 1 As shown, a battery box 3 is provided. The battery box 3 includes a box body 2 made of non-metallic composite material, and the battery box 3 includes the connector reinforcement structure 1 described above.

[0120] As described above, to reduce the temperature difference between the cells within the battery box 3, a colloid is injected into the box 2. Since the colloid is fluid, its spreading flow can block the connector opening 22, preventing it from functioning properly and allowing the output wires, such as the cell cables, inside the box 2 to be delivered through it. Therefore, a connector reinforcement structure 1 is installed at the connector opening 22 to prevent the colloid from flowing and blocking it. The connector reinforcement structure 1 forms a cavity 14 at the connector opening 22 facing the interior of the box 2. This cavity 14 not only blocks the spread of the colloid but also provides space for the subsequent arrangement of the cell cables extending from the connector opening 22 within the box 2.

[0121] The connector reinforcement structure 1 includes a third reinforcement part 13, which is connected to the first reinforcement part 11. When the third reinforcement part 13 is inserted into the connector pre-drilled hole 22, a channel is formed between the third reinforcement part 13 and the connector pre-drilled hole 22, connecting the third reinforcement part 13 and the first reinforcement part 11. This channel communicates with the cavity 14, allowing the cables of the battery cells inside the housing 2 to freely extend from inside the housing 2 into the cavity 14, and then through the channel to the outside of the housing 2. The purpose of the cavity 14, as described above, is not only to prevent the spread of the injected adhesive but also to accommodate or arrange the cables of the battery cells inside the housing 2. Therefore, this structure provides further protection for the cables of the battery cells as they extend from inside the housing 2 to the outside. Simultaneously, connecting the third reinforcement part 13 and the first reinforcement part 11 enhances the overall structural strength of the connector reinforcement structure 1 and the strength of its connection with the housing 2.

[0122] Moreover, as mentioned above, the third reinforcing part 13 is connected to the connector reserved opening 22 by bonding or welding. By increasing the contact area between the third reinforcing part 13 and the connector reserved opening 22, the stability of the bonding can be enhanced, and the structural strength of the entire connector reinforcing structure 1 and the housing 2 can also be improved.

[0123] The enclosure 2 comprises an inner shell 25 and an outer shell 26 stacked on top of each other, forming the enclosure 2. The use of a connector reinforcement structure 1 at the joint between the inner shell 25 and the outer shell 26 improves the insulation effect inside the enclosure 2. Furthermore, the connector pre-drilled port 22 penetrates both the inner shell 25 and the outer shell 26, allowing the output wires, such as the cables of the battery cells inside the enclosure 2, to be routed out through the connector pre-drilled port 22.

[0124] The first reinforcing part 11 is connected to the inner housing 25 and is located on the inner side of the housing 2, i.e., on the inner housing 25. The third reinforcing part 13 is at least connected to the outer housing 26 and covers the seam between the inner housing 25 and the outer housing 26 at the connector reserved opening 22, which can further improve the sealing effect of the housing 2 at the seam and ensure the heat insulation performance of the housing 2 at the connector reserved opening 22. Therefore, the connection between the inside and outside of the housing 2 can be achieved through the entire connector reinforcing part.

[0125] like Figure 1-2 As shown, the box 2 includes an upper box unit 23 and a lower box 24, which cover each other and together form a box 2.

[0126] In this embodiment, the connector reserved opening 22 is located on the lower housing 24, which facilitates the processing of composite material parts. If the connector reserved opening 22 were to extend across the space between the upper housing unit 23 and the lower housing 24, the processing procedures for the housing 2 would be increased, making the operation more cumbersome.

[0127] The third reinforcing part 13 is connected to the lower housing 24. Compared to installing the third reinforcing part 13 in the middle part of the upper housing 23 and the lower housing 24, connecting the third reinforcing part 13 to the lower housing 24 makes the injection molding of the upper housing 23 and the lower housing 24 more convenient, and also facilitates the connection between the third reinforcing part 13 and the lower housing 24. Furthermore, the third reinforcing part 13 can be fixedly connected to the lower housing 24 by bonding or welding. In this embodiment, welding is preferred, as it enhances the stability of the connection and improves the overall structural strength of the connector reinforcement structure 1. Moreover, as described above, fixing the third reinforcing part 13 to the connector pre-reserved opening 22 strengthens the connection between the third reinforcing part 13 and the connector pre-reserved opening 22, facilitates the disassembly and installation of the third reinforcing part 13, and improves the sealing performance between the third reinforcing part 13 and the connector pre-reserved opening 22.

[0128] As shown in the figure, the battery box 3's casing 2 includes an inner casing 25 and an outer casing 26. The outer casing 26 covers the outer surface of the inner casing 25, and the outer periphery of the outer casing 26 is further covered and connected by a metal connecting plate 27. That is, the casing 2's periphery is completely covered by the connecting plate 27. The first reinforcing part 11 and the second reinforcing part 12 of the connector reinforcing structure 1 are connected to the inner surface of the inner casing 25, and the third reinforcing part 13 penetrates through the connector pre-reserved opening 22, with its end contacting and connecting to the connecting plate 27.

[0129] In this embodiment, the battery box 3 also includes an electrical connector 4, which is disposed at the connector pre-reserved opening 22, i.e., the electrical connector 4 is fixedly connected to the connecting plate 27 located on the outer surface of the box body 2. The structure of the connecting plate 27 is as follows: Figure 3 As shown, a metal plate with an "L"-shaped cross-section is installed on the outer peripheral surface of the housing 2, which is made of non-metallic composite material, to reinforce the housing 2. Simultaneously, the outer surface of the connecting plate 27 is used to install the quick-change unit. The connection between the connecting plate 27 and the housing 2 can be achieved using screws and nuts, or further, by adhesive bonding.

[0130] The quick-change unit mounted on the connecting plate 27 includes, but is not limited to, an electrical / liquid cooling connector and a locking mechanism. The locking mechanisms include threaded locking mechanisms (locking the battery box to the vehicle body using multiple bolts), pin locking mechanisms (locking the battery box to the vehicle body using pin locking), rotary locking mechanisms (locking the battery box to the vehicle body using rotary locking), flip locking mechanisms (locking the battery box to the vehicle body using flip locking), top-pressing locking mechanisms (locking the battery box to the vehicle body using top-pressing locking), staggered-tooth locking mechanisms (locking the battery box to the vehicle body using staggered-tooth locking), pin locking mechanisms (locking the battery box to the vehicle body using pin locking), and push-pull locking mechanisms (locking the battery box to the vehicle body using push-pull locking). In this embodiment, the quick-change unit mounted on the connecting plate 27 is a staggered-tooth locking mechanism composed of a locking shaft and a guide block.

[0131] In this embodiment, the inner surface of the electrical connector 4 is inserted into the reserved opening 22 of the connector and mates with the cable of the battery cell, thereby achieving the purpose of leading out the cable of the battery cell.

[0132] Test case

[0133] A certain fast-swap electric vehicle currently uses a sheet metal battery pack (using mica sheets as insulation material), which weighs 371.5 kg. A non-metallic composite battery pack with the same dimensions (external dimensions and internal battery box dimensions) as the aforementioned sheet metal battery pack is to be prepared.

[0134] Both sheet metal battery packs and non-metallic composite battery packs have a battery box formed by combining an upper cover and a lower box.

[0135] like Figure 13 As shown, the upper cover (upper box unit 23) of the non-metallic composite battery box has the following structure: the upper cover includes a cover shell 231, a heat insulation layer 232, and a protective layer 233. The heat insulation layer 232 and the protective layer 233 cover and fix the cover shell 231 to the downward-facing side. The cover shell 231 is molded from SMC material, the lightweight and flexible heat insulation layer 232 is made of 5mm thick aerogel felt, and the protective layer 233 is made of fireproof cloth. The cover shell 231 and the heat insulation layer 232, as well as the heat insulation layer 232 and the protective layer 233, are connected by structural adhesive. A concave-convex structure 231a is provided on the cover shell 231 to increase its strength.

[0136] like Figure 14As shown, the lower casing of the non-metallic composite battery box adopts the lower casing (lower casing 24) in the above embodiment. This lower casing includes a stacked outer casing (outer casing 26) and an inner casing (inner casing 25). The sidewalls of the outer casing extend outward to form a reinforcing structure 261. The reinforcing structure 261 has recessed portions 262 to reduce weight while maintaining strength. Intersecting reinforcing ribs 263 are provided between the inner casing and the outer casing. The reinforcing ribs 263 are formed on the upper surface of the outer casing (and the surface of the outer casing facing the inner casing) and are connected to the inner casing by adhesive bonding. The reinforcing ribs 263 divide the inner casing and the outer casing into several chambers, forming a chamber structure. The height of the chamber structure between the outer casing and the inner casing (i.e., the distance between the opposing surfaces of the outer casing and the inner casing) is 5 mm. Both the outer casing and the inner casing are molded from SMC.

[0137] When no aerogel is placed inside the chamber structure, the resulting lower box is denoted as non-metallic composite material lower box A. When aerogel is placed inside the chamber structure, the resulting lower box is denoted as non-metallic composite material lower box B. Non-metallic composite material lower box A and non-metallic composite material lower box B are respectively combined with the upper box cover by snap-fit ​​to form a non-metallic composite material battery box, denoted as non-metallic composite material battery box A and non-metallic composite material battery box B. After battery modules and necessary electrical components are installed, non-metallic composite material battery pack A and non-metallic composite material battery pack B are formed.

[0138] The upper cover and the lower box are sealed with a U-shaped seal. The side of the upper cover has a recessed part, which cooperates with the protrusion on the side of the lower box to form a snap-fit ​​connection. The upper cover and the lower box are molded in one step to achieve the snap-fit ​​connection structure.

[0139] Tests were conducted on non-metallic composite battery pack A, non-metallic composite battery pack B, and sheet metal battery pack of the same size and specifications.

[0140] In terms of weight testing, the non-metallic composite lower casing B weighs 45kg, while the sheet metal lower casing (using mica sheets as insulation) of the same size weighs 60.4kg. Compared to the sheet metal lower casing, the non-metallic composite lower casing B is 25.5% lighter. The non-metallic composite battery box B weighs 57.8kg, while the sheet metal battery box weighs 70.772kg, showing a significant weight advantage for the non-metallic composite battery box. Compared to the non-metallic composite lower casing B, the non-metallic composite lower casing A lacks the aerogel felt placed in the chamber structure. Due to the low density and small amount of aerogel felt used, the weight of the non-metallic composite lower casing A is comparable to that of the non-metallic composite lower casing B, with a slight reduction (almost negligible). Regarding the overall weight of the battery pack, the overall weight of both the non-metallic composite battery pack A and B is 2-3% lighter than that of the sheet metal battery pack, demonstrating a significant weight advantage.

[0141] In terms of strength testing, the non-metallic composite lower housing A and the non-metallic composite lower housing B, as well as the non-metallic composite material top cover used to combine with them to form a composite non-metallic battery box, all meet the strength and other requirements specified in GB / T 31467.3-2015 "Lithium-ion Power Battery Packs and Systems for Electric Vehicles - Part 3: Safety Requirements and Test Methods" (in actual testing, they can reach 1.5 times the standard). They are suitable for use in electric vehicles.

[0142] Regarding thermal insulation performance: With an initial internal temperature of 20-30℃ and placed in an environment of 7-9℃ for 600 minutes, the cumulative temperature change rate (cumulative cooling rate) of the individual cells in the non-metallic composite battery pack A was less than 50% of that in the sheet metal battery pack (cell temperature measured via fiber optic). The cumulative temperature change rate of the individual cells in the non-metallic composite battery pack B was only about 40% of that in the sheet metal battery pack. This advantage is even more pronounced at lower temperatures, ensuring that the cells remain at their optimal operating temperature in cold northern regions. Furthermore, tests showed that both non-metallic composite battery pack A and non-metallic composite battery pack B can withstand temperatures up to 1000℃. In simulated battery fire tests, even when the battery completely burned, the non-metallic composite casing remained largely intact throughout the test, only showing smoke without any open flame.

[0143] In both non-metallic composite battery pack A and non-metallic composite battery pack B, thermally conductive adhesive is injected into the cell placement cavity (the adhesive filling height is approximately 1 / 3 of the battery height). This serves two purposes: firstly, it increases the temperature uniformity among the cells, preventing thermal runaway caused by abnormal temperatures in individual cells; secondly, it makes the cells (or battery modules formed by cells) inside the battery pack form a unified whole, increasing the overall strength of the battery pack. Compared to the sheet metal battery pack described above, in the same environment, when charged with a 40A charging current (SOC from 0-100%), the sheet metal battery pack B experiences a cumulative temperature rise of more than 5°C, and its charging capacity is more than 5% higher. Furthermore, the maximum temperature difference inside the casing of the composite non-metallic battery pack (obtained by recording the temperatures of all positive and negative electrodes) remains uniform at 1.5-2°C. This is not only related to the use of thermally conductive adhesive, but also to the fact that SMC has a higher specific heat capacity and thermal insulation performance than sheet metal materials. These factors make the non-metallic composite battery pack of this application more advantageous than sheet metal battery packs in avoiding thermal runaway.

[0144] The properties of some of the raw materials used in the above test examples are as follows:

[0145] SMC must meet the following performance requirements: material grade (disordered glass fiber state) tensile strength ≥70 MPa (GB / T 1447-2005), flexural strength ≥160 MPa (GB / T 1449-2005), impact toughness ≥55 KJ / m 2 (GB / T 1451-2005), elongation at break ≥1.3% (GB / T 1447-2005).

[0146] The density of aerogel mat is approximately 0.16 mg / cm³. 3 .

[0147] The structural adhesive has a shear strength (anodized aluminum-anodized aluminum) ≥6MPa, a tensile strength ≥5MPa, and a flame retardant rating of V0.

[0148] The SMC, aerogel felt, and structural adhesive mentioned above can be commercially available products or self-made products that meet the above performance requirements, while the remaining materials are commercially available products.

Claims

1. A connector reinforcement structure for installation in a non-metallic composite case, characterized by, The connector reinforcing structure comprises: a first reinforcing part for surrounding a connector reserved port of the box body and connecting an inner side surface of the box body; a second reinforcing part connected to the first reinforcing part, a cavity surrounded by at least the second reinforcing part, the cavity being communicated to the connector reserved port at the first reinforcing part, the cavity having an upward opening, the second reinforcing part having a surrounding plate for surrounding the connector reserved port on the inner side of the box body, a top end of the surrounding plate being higher than a glue filling height in the box body, a bottom end of the surrounding plate extending to a bottom surface inside the box body, and an edge of the opening being set to be higher than the glue filling height in the box body.

2. The connector reinforcement structure of claim 1, wherein, The cavity is surrounded by the first reinforcing part and the second reinforcing part, and the first reinforcing part and the second reinforcing part are connected to the box body by bonding or welding.

3. The connector reinforcement structure of claim 1, wherein, The first reinforcing part comprises: a back plate spaced apart from the inner side surface of the box body; an extension structure extending from an edge of the back plate towards the inner side surface of the box body and surrounding a hollow part with the opening towards the inner side surface of the box body with the back plate, the extension structure having a folded edge at the inner side surface of the box body, the folded edge being fitted to the inner side surface of the box body and connected to the box body by bonding or welding; a reinforcing rib in the hollow part surrounded by the extension structure and the back plate, the reinforcing rib being formed on a surface of the back plate, and end portions of the reinforcing rib being connected to a surface of the extension structure.

4. The connector reinforcement structure of claim 1, wherein, The surrounding plate comprises: two side plates, one end of each of the two side plates being connected to the first reinforcing part close to the inner side surface of the box body, and the other end of each of the two side plates extending towards the inside of the box body; an end plate, two ends of the end plate being connected to one end of each of the two side plates extending towards the inside of the box body.

5. The connector reinforcement structure of claim 4, wherein, The second reinforcing part further comprises a bottom plate below the two side plates, one side surface of the bottom plate being connected to each of the two side plates, and the other side surface of the bottom plate being connected to a bottom surface of the box body.

6. The connector reinforcement structure of any one of claims 1-5, wherein, The connector reinforcing structure further comprises a third reinforcing part connected to the first reinforcing part, the third reinforcing part surrounding a channel for passing through the connector reserved port, and the channel being communicated with the cavity.

7. The connector reinforcement structure of claim 6, wherein, The third reinforcing part is integrally formed with the first reinforcing part.

8. The connector reinforcement structure of claim 1, wherein, The connector reinforcing structure further comprises thermal insulation material arranged in the cavity.

9. A battery box comprising a box body of a non-metallic composite material, characterized in that The battery box further comprises the connector reinforcing structure according to any one of claims 1-8.

10. The battery pack of claim 9, wherein, The connector reinforcing structure further comprises a third reinforcing part connected to the first reinforcing part, the third reinforcing part surrounding a channel for passing through the connector reserved port, the channel being communicated with the cavity, and the third reinforcing part being connected to the connector reserved port by bonding or welding.

11. The battery pack of claim 10, wherein, The box comprises opposite stacked inner and outer box shells, and the connector reservation port is arranged through the inner and outer box shells; The first reinforcing part is connected to the inner box shell, and the third reinforcing part is connected to at least the outer box shell and covers the joint of the inner and outer box shells at the connector reservation port.

12. The battery pack of claim 9, wherein, The box comprises opposite combined upper box unit and lower box, and the connector reservation port of the box is arranged on the lower box.

13. The battery pack of claim 12, wherein, The third reinforcing part is connected to the lower box by bonding or welding and is connected at the connector reservation port.

14. The battery pack of claim 9, wherein, The battery box further comprises an electric connector connected to a connecting plate fixed to the outside of the box and arranged at the connector reservation port.

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